diff options
Diffstat (limited to 'check/main.c')
| -rw-r--r-- | check/main.c | 9932 |
1 files changed, 9932 insertions, 0 deletions
diff --git a/check/main.c b/check/main.c new file mode 100644 index 00000000..97baae58 --- /dev/null +++ b/check/main.c @@ -0,0 +1,9932 @@ +/* + * Copyright (C) 2007 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <getopt.h> +#include <uuid/uuid.h> +#include "ctree.h" +#include "volumes.h" +#include "repair.h" +#include "disk-io.h" +#include "print-tree.h" +#include "task-utils.h" +#include "transaction.h" +#include "utils.h" +#include "commands.h" +#include "free-space-cache.h" +#include "free-space-tree.h" +#include "btrfsck.h" +#include "qgroup-verify.h" +#include "rbtree-utils.h" +#include "backref.h" +#include "kernel-shared/ulist.h" +#include "hash.h" +#include "help.h" +#include "check/mode-common.h" +#include "check/mode-original.h" +#include "check/mode-lowmem.h" + +enum task_position { + TASK_EXTENTS, + TASK_FREE_SPACE, + TASK_FS_ROOTS, + TASK_NOTHING, /* have to be the last element */ +}; + +struct task_ctx { + int progress_enabled; + enum task_position tp; + + struct task_info *info; +}; + +u64 bytes_used = 0; +u64 total_csum_bytes = 0; +u64 total_btree_bytes = 0; +u64 total_fs_tree_bytes = 0; +u64 total_extent_tree_bytes = 0; +u64 btree_space_waste = 0; +u64 data_bytes_allocated = 0; +u64 data_bytes_referenced = 0; +LIST_HEAD(duplicate_extents); +LIST_HEAD(delete_items); +int no_holes = 0; +int init_extent_tree = 0; +int check_data_csum = 0; +struct btrfs_fs_info *global_info; +struct task_ctx ctx = { 0 }; +struct cache_tree *roots_info_cache = NULL; + +enum btrfs_check_mode { + CHECK_MODE_ORIGINAL, + CHECK_MODE_LOWMEM, + CHECK_MODE_UNKNOWN, + CHECK_MODE_DEFAULT = CHECK_MODE_ORIGINAL +}; + +static enum btrfs_check_mode check_mode = CHECK_MODE_DEFAULT; + +static int compare_data_backref(struct rb_node *node1, struct rb_node *node2) +{ + struct extent_backref *ext1 = rb_node_to_extent_backref(node1); + struct extent_backref *ext2 = rb_node_to_extent_backref(node2); + struct data_backref *back1 = to_data_backref(ext1); + struct data_backref *back2 = to_data_backref(ext2); + + WARN_ON(!ext1->is_data); + WARN_ON(!ext2->is_data); + + /* parent and root are a union, so this covers both */ + if (back1->parent > back2->parent) + return 1; + if (back1->parent < back2->parent) + return -1; + + /* This is a full backref and the parents match. */ + if (back1->node.full_backref) + return 0; + + if (back1->owner > back2->owner) + return 1; + if (back1->owner < back2->owner) + return -1; + + if (back1->offset > back2->offset) + return 1; + if (back1->offset < back2->offset) + return -1; + + if (back1->found_ref && back2->found_ref) { + if (back1->disk_bytenr > back2->disk_bytenr) + return 1; + if (back1->disk_bytenr < back2->disk_bytenr) + return -1; + + if (back1->bytes > back2->bytes) + return 1; + if (back1->bytes < back2->bytes) + return -1; + } + + return 0; +} + +static int compare_tree_backref(struct rb_node *node1, struct rb_node *node2) +{ + struct extent_backref *ext1 = rb_node_to_extent_backref(node1); + struct extent_backref *ext2 = rb_node_to_extent_backref(node2); + struct tree_backref *back1 = to_tree_backref(ext1); + struct tree_backref *back2 = to_tree_backref(ext2); + + WARN_ON(ext1->is_data); + WARN_ON(ext2->is_data); + + /* parent and root are a union, so this covers both */ + if (back1->parent > back2->parent) + return 1; + if (back1->parent < back2->parent) + return -1; + + return 0; +} + +static int compare_extent_backref(struct rb_node *node1, struct rb_node *node2) +{ + struct extent_backref *ext1 = rb_node_to_extent_backref(node1); + struct extent_backref *ext2 = rb_node_to_extent_backref(node2); + + if (ext1->is_data > ext2->is_data) + return 1; + + if (ext1->is_data < ext2->is_data) + return -1; + + if (ext1->full_backref > ext2->full_backref) + return 1; + if (ext1->full_backref < ext2->full_backref) + return -1; + + if (ext1->is_data) + return compare_data_backref(node1, node2); + else + return compare_tree_backref(node1, node2); +} + + +static void *print_status_check(void *p) +{ + struct task_ctx *priv = p; + const char work_indicator[] = { '.', 'o', 'O', 'o' }; + uint32_t count = 0; + static char *task_position_string[] = { + "checking extents", + "checking free space cache", + "checking fs roots", + }; + + task_period_start(priv->info, 1000 /* 1s */); + + if (priv->tp == TASK_NOTHING) + return NULL; + + while (1) { + printf("%s [%c]\r", task_position_string[priv->tp], + work_indicator[count % 4]); + count++; + fflush(stdout); + task_period_wait(priv->info); + } + return NULL; +} + +static int print_status_return(void *p) +{ + printf("\n"); + fflush(stdout); + + return 0; +} + +static enum btrfs_check_mode parse_check_mode(const char *str) +{ + if (strcmp(str, "lowmem") == 0) + return CHECK_MODE_LOWMEM; + if (strcmp(str, "orig") == 0) + return CHECK_MODE_ORIGINAL; + if (strcmp(str, "original") == 0) + return CHECK_MODE_ORIGINAL; + + return CHECK_MODE_UNKNOWN; +} + +/* Compatible function to allow reuse of old codes */ +static u64 first_extent_gap(struct rb_root *holes) +{ + struct file_extent_hole *hole; + + if (RB_EMPTY_ROOT(holes)) + return (u64)-1; + + hole = rb_entry(rb_first(holes), struct file_extent_hole, node); + return hole->start; +} + +static int compare_hole(struct rb_node *node1, struct rb_node *node2) +{ + struct file_extent_hole *hole1; + struct file_extent_hole *hole2; + + hole1 = rb_entry(node1, struct file_extent_hole, node); + hole2 = rb_entry(node2, struct file_extent_hole, node); + + if (hole1->start > hole2->start) + return -1; + if (hole1->start < hole2->start) + return 1; + /* Now hole1->start == hole2->start */ + if (hole1->len >= hole2->len) + /* + * Hole 1 will be merge center + * Same hole will be merged later + */ + return -1; + /* Hole 2 will be merge center */ + return 1; +} + +/* + * Add a hole to the record + * + * This will do hole merge for copy_file_extent_holes(), + * which will ensure there won't be continuous holes. + */ +static int add_file_extent_hole(struct rb_root *holes, + u64 start, u64 len) +{ + struct file_extent_hole *hole; + struct file_extent_hole *prev = NULL; + struct file_extent_hole *next = NULL; + + hole = malloc(sizeof(*hole)); + if (!hole) + return -ENOMEM; + hole->start = start; + hole->len = len; + /* Since compare will not return 0, no -EEXIST will happen */ + rb_insert(holes, &hole->node, compare_hole); + + /* simple merge with previous hole */ + if (rb_prev(&hole->node)) + prev = rb_entry(rb_prev(&hole->node), struct file_extent_hole, + node); + if (prev && prev->start + prev->len >= hole->start) { + hole->len = hole->start + hole->len - prev->start; + hole->start = prev->start; + rb_erase(&prev->node, holes); + free(prev); + prev = NULL; + } + + /* iterate merge with next holes */ + while (1) { + if (!rb_next(&hole->node)) + break; + next = rb_entry(rb_next(&hole->node), struct file_extent_hole, + node); + if (hole->start + hole->len >= next->start) { + if (hole->start + hole->len <= next->start + next->len) + hole->len = next->start + next->len - + hole->start; + rb_erase(&next->node, holes); + free(next); + next = NULL; + } else + break; + } + return 0; +} + +static int compare_hole_range(struct rb_node *node, void *data) +{ + struct file_extent_hole *hole; + u64 start; + + hole = (struct file_extent_hole *)data; + start = hole->start; + + hole = rb_entry(node, struct file_extent_hole, node); + if (start < hole->start) + return -1; + if (start >= hole->start && start < hole->start + hole->len) + return 0; + return 1; +} + +/* + * Delete a hole in the record + * + * This will do the hole split and is much restrict than add. + */ +static int del_file_extent_hole(struct rb_root *holes, + u64 start, u64 len) +{ + struct file_extent_hole *hole; + struct file_extent_hole tmp; + u64 prev_start = 0; + u64 prev_len = 0; + u64 next_start = 0; + u64 next_len = 0; + struct rb_node *node; + int have_prev = 0; + int have_next = 0; + int ret = 0; + + tmp.start = start; + tmp.len = len; + node = rb_search(holes, &tmp, compare_hole_range, NULL); + if (!node) + return -EEXIST; + hole = rb_entry(node, struct file_extent_hole, node); + if (start + len > hole->start + hole->len) + return -EEXIST; + + /* + * Now there will be no overlap, delete the hole and re-add the + * split(s) if they exists. + */ + if (start > hole->start) { + prev_start = hole->start; + prev_len = start - hole->start; + have_prev = 1; + } + if (hole->start + hole->len > start + len) { + next_start = start + len; + next_len = hole->start + hole->len - start - len; + have_next = 1; + } + rb_erase(node, holes); + free(hole); + if (have_prev) { + ret = add_file_extent_hole(holes, prev_start, prev_len); + if (ret < 0) + return ret; + } + if (have_next) { + ret = add_file_extent_hole(holes, next_start, next_len); + if (ret < 0) + return ret; + } + return 0; +} + +static int copy_file_extent_holes(struct rb_root *dst, + struct rb_root *src) +{ + struct file_extent_hole *hole; + struct rb_node *node; + int ret = 0; + + node = rb_first(src); + while (node) { + hole = rb_entry(node, struct file_extent_hole, node); + ret = add_file_extent_hole(dst, hole->start, hole->len); + if (ret) + break; + node = rb_next(node); + } + return ret; +} + +static void free_file_extent_holes(struct rb_root *holes) +{ + struct rb_node *node; + struct file_extent_hole *hole; + + node = rb_first(holes); + while (node) { + hole = rb_entry(node, struct file_extent_hole, node); + rb_erase(node, holes); + free(hole); + node = rb_first(holes); + } +} + +static void record_root_in_trans(struct btrfs_trans_handle *trans, + struct btrfs_root *root) +{ + if (root->last_trans != trans->transid) { + root->track_dirty = 1; + root->last_trans = trans->transid; + root->commit_root = root->node; + extent_buffer_get(root->node); + } +} + +static int device_record_compare(struct rb_node *node1, struct rb_node *node2) +{ + struct device_record *rec1; + struct device_record *rec2; + + rec1 = rb_entry(node1, struct device_record, node); + rec2 = rb_entry(node2, struct device_record, node); + if (rec1->devid > rec2->devid) + return -1; + else if (rec1->devid < rec2->devid) + return 1; + else + return 0; +} + +static struct inode_record *clone_inode_rec(struct inode_record *orig_rec) +{ + struct inode_record *rec; + struct inode_backref *backref; + struct inode_backref *orig; + struct inode_backref *tmp; + struct orphan_data_extent *src_orphan; + struct orphan_data_extent *dst_orphan; + struct rb_node *rb; + size_t size; + int ret; + + rec = malloc(sizeof(*rec)); + if (!rec) + return ERR_PTR(-ENOMEM); + memcpy(rec, orig_rec, sizeof(*rec)); + rec->refs = 1; + INIT_LIST_HEAD(&rec->backrefs); + INIT_LIST_HEAD(&rec->orphan_extents); + rec->holes = RB_ROOT; + + list_for_each_entry(orig, &orig_rec->backrefs, list) { + size = sizeof(*orig) + orig->namelen + 1; + backref = malloc(size); + if (!backref) { + ret = -ENOMEM; + goto cleanup; + } + memcpy(backref, orig, size); + list_add_tail(&backref->list, &rec->backrefs); + } + list_for_each_entry(src_orphan, &orig_rec->orphan_extents, list) { + dst_orphan = malloc(sizeof(*dst_orphan)); + if (!dst_orphan) { + ret = -ENOMEM; + goto cleanup; + } + memcpy(dst_orphan, src_orphan, sizeof(*src_orphan)); + list_add_tail(&dst_orphan->list, &rec->orphan_extents); + } + ret = copy_file_extent_holes(&rec->holes, &orig_rec->holes); + if (ret < 0) + goto cleanup_rb; + + return rec; + +cleanup_rb: + rb = rb_first(&rec->holes); + while (rb) { + struct file_extent_hole *hole; + + hole = rb_entry(rb, struct file_extent_hole, node); + rb = rb_next(rb); + free(hole); + } + +cleanup: + if (!list_empty(&rec->backrefs)) + list_for_each_entry_safe(orig, tmp, &rec->backrefs, list) { + list_del(&orig->list); + free(orig); + } + + if (!list_empty(&rec->orphan_extents)) + list_for_each_entry_safe(orig, tmp, &rec->orphan_extents, list) { + list_del(&orig->list); + free(orig); + } + + free(rec); + + return ERR_PTR(ret); +} + +static void print_orphan_data_extents(struct list_head *orphan_extents, + u64 objectid) +{ + struct orphan_data_extent *orphan; + + if (list_empty(orphan_extents)) + return; + printf("The following data extent is lost in tree %llu:\n", + objectid); + list_for_each_entry(orphan, orphan_extents, list) { + printf("\tinode: %llu, offset:%llu, disk_bytenr: %llu, disk_len: %llu\n", + orphan->objectid, orphan->offset, orphan->disk_bytenr, + orphan->disk_len); + } +} + +static void print_inode_error(struct btrfs_root *root, struct inode_record *rec) +{ + u64 root_objectid = root->root_key.objectid; + int errors = rec->errors; + + if (!errors) + return; + /* reloc root errors, we print its corresponding fs root objectid*/ + if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) { + root_objectid = root->root_key.offset; + fprintf(stderr, "reloc"); + } + fprintf(stderr, "root %llu inode %llu errors %x", + (unsigned long long) root_objectid, + (unsigned long long) rec->ino, rec->errors); + + if (errors & I_ERR_NO_INODE_ITEM) + fprintf(stderr, ", no inode item"); + if (errors & I_ERR_NO_ORPHAN_ITEM) + fprintf(stderr, ", no orphan item"); + if (errors & I_ERR_DUP_INODE_ITEM) + fprintf(stderr, ", dup inode item"); + if (errors & I_ERR_DUP_DIR_INDEX) + fprintf(stderr, ", dup dir index"); + if (errors & I_ERR_ODD_DIR_ITEM) + fprintf(stderr, ", odd dir item"); + if (errors & I_ERR_ODD_FILE_EXTENT) + fprintf(stderr, ", odd file extent"); + if (errors & I_ERR_BAD_FILE_EXTENT) + fprintf(stderr, ", bad file extent"); + if (errors & I_ERR_FILE_EXTENT_OVERLAP) + fprintf(stderr, ", file extent overlap"); + if (errors & I_ERR_FILE_EXTENT_DISCOUNT) + fprintf(stderr, ", file extent discount"); + if (errors & I_ERR_DIR_ISIZE_WRONG) + fprintf(stderr, ", dir isize wrong"); + if (errors & I_ERR_FILE_NBYTES_WRONG) + fprintf(stderr, ", nbytes wrong"); + if (errors & I_ERR_ODD_CSUM_ITEM) + fprintf(stderr, ", odd csum item"); + if (errors & I_ERR_SOME_CSUM_MISSING) + fprintf(stderr, ", some csum missing"); + if (errors & I_ERR_LINK_COUNT_WRONG) + fprintf(stderr, ", link count wrong"); + if (errors & I_ERR_FILE_EXTENT_ORPHAN) + fprintf(stderr, ", orphan file extent"); + fprintf(stderr, "\n"); + /* Print the orphan extents if needed */ + if (errors & I_ERR_FILE_EXTENT_ORPHAN) + print_orphan_data_extents(&rec->orphan_extents, root->objectid); + + /* Print the holes if needed */ + if (errors & I_ERR_FILE_EXTENT_DISCOUNT) { + struct file_extent_hole *hole; + struct rb_node *node; + int found = 0; + + node = rb_first(&rec->holes); + fprintf(stderr, "Found file extent holes:\n"); + while (node) { + found = 1; + hole = rb_entry(node, struct file_extent_hole, node); + fprintf(stderr, "\tstart: %llu, len: %llu\n", + hole->start, hole->len); + node = rb_next(node); + } + if (!found) + fprintf(stderr, "\tstart: 0, len: %llu\n", + round_up(rec->isize, + root->fs_info->sectorsize)); + } +} + +static void print_ref_error(int errors) +{ + if (errors & REF_ERR_NO_DIR_ITEM) + fprintf(stderr, ", no dir item"); + if (errors & REF_ERR_NO_DIR_INDEX) + fprintf(stderr, ", no dir index"); + if (errors & REF_ERR_NO_INODE_REF) + fprintf(stderr, ", no inode ref"); + if (errors & REF_ERR_DUP_DIR_ITEM) + fprintf(stderr, ", dup dir item"); + if (errors & REF_ERR_DUP_DIR_INDEX) + fprintf(stderr, ", dup dir index"); + if (errors & REF_ERR_DUP_INODE_REF) + fprintf(stderr, ", dup inode ref"); + if (errors & REF_ERR_INDEX_UNMATCH) + fprintf(stderr, ", index mismatch"); + if (errors & REF_ERR_FILETYPE_UNMATCH) + fprintf(stderr, ", filetype mismatch"); + if (errors & REF_ERR_NAME_TOO_LONG) + fprintf(stderr, ", name too long"); + if (errors & REF_ERR_NO_ROOT_REF) + fprintf(stderr, ", no root ref"); + if (errors & REF_ERR_NO_ROOT_BACKREF) + fprintf(stderr, ", no root backref"); + if (errors & REF_ERR_DUP_ROOT_REF) + fprintf(stderr, ", dup root ref"); + if (errors & REF_ERR_DUP_ROOT_BACKREF) + fprintf(stderr, ", dup root backref"); + fprintf(stderr, "\n"); +} + +static struct inode_record *get_inode_rec(struct cache_tree *inode_cache, + u64 ino, int mod) +{ + struct ptr_node *node; + struct cache_extent *cache; + struct inode_record *rec = NULL; + int ret; + + cache = lookup_cache_extent(inode_cache, ino, 1); + if (cache) { + node = container_of(cache, struct ptr_node, cache); + rec = node->data; + if (mod && rec->refs > 1) { + node->data = clone_inode_rec(rec); + if (IS_ERR(node->data)) + return node->data; + rec->refs--; + rec = node->data; + } + } else if (mod) { + rec = calloc(1, sizeof(*rec)); + if (!rec) + return ERR_PTR(-ENOMEM); + rec->ino = ino; + rec->extent_start = (u64)-1; + rec->refs = 1; + INIT_LIST_HEAD(&rec->backrefs); + INIT_LIST_HEAD(&rec->orphan_extents); + rec->holes = RB_ROOT; + + node = malloc(sizeof(*node)); + if (!node) { + free(rec); + return ERR_PTR(-ENOMEM); + } + node->cache.start = ino; + node->cache.size = 1; + node->data = rec; + + if (ino == BTRFS_FREE_INO_OBJECTID) + rec->found_link = 1; + + ret = insert_cache_extent(inode_cache, &node->cache); + if (ret) + return ERR_PTR(-EEXIST); + } + return rec; +} + +static void free_orphan_data_extents(struct list_head *orphan_extents) +{ + struct orphan_data_extent *orphan; + + while (!list_empty(orphan_extents)) { + orphan = list_entry(orphan_extents->next, + struct orphan_data_extent, list); + list_del(&orphan->list); + free(orphan); + } +} + +static void free_inode_rec(struct inode_record *rec) +{ + struct inode_backref *backref; + + if (--rec->refs > 0) + return; + + while (!list_empty(&rec->backrefs)) { + backref = to_inode_backref(rec->backrefs.next); + list_del(&backref->list); + free(backref); + } + free_orphan_data_extents(&rec->orphan_extents); + free_file_extent_holes(&rec->holes); + free(rec); +} + +static int can_free_inode_rec(struct inode_record *rec) +{ + if (!rec->errors && rec->checked && rec->found_inode_item && + rec->nlink == rec->found_link && list_empty(&rec->backrefs)) + return 1; + return 0; +} + +static void maybe_free_inode_rec(struct cache_tree *inode_cache, + struct inode_record *rec) +{ + struct cache_extent *cache; + struct inode_backref *tmp, *backref; + struct ptr_node *node; + u8 filetype; + + if (!rec->found_inode_item) + return; + + filetype = imode_to_type(rec->imode); + list_for_each_entry_safe(backref, tmp, &rec->backrefs, list) { + if (backref->found_dir_item && backref->found_dir_index) { + if (backref->filetype != filetype) + backref->errors |= REF_ERR_FILETYPE_UNMATCH; + if (!backref->errors && backref->found_inode_ref && + rec->nlink == rec->found_link) { + list_del(&backref->list); + free(backref); + } + } + } + + if (!rec->checked || rec->merging) + return; + + if (S_ISDIR(rec->imode)) { + if (rec->found_size != rec->isize) + rec->errors |= I_ERR_DIR_ISIZE_WRONG; + if (rec->found_file_extent) + rec->errors |= I_ERR_ODD_FILE_EXTENT; + } else if (S_ISREG(rec->imode) || S_ISLNK(rec->imode)) { + if (rec->found_dir_item) + rec->errors |= I_ERR_ODD_DIR_ITEM; + if (rec->found_size != rec->nbytes) + rec->errors |= I_ERR_FILE_NBYTES_WRONG; + if (rec->nlink > 0 && !no_holes && + (rec->extent_end < rec->isize || + first_extent_gap(&rec->holes) < rec->isize)) + rec->errors |= I_ERR_FILE_EXTENT_DISCOUNT; + } + + if (S_ISREG(rec->imode) || S_ISLNK(rec->imode)) { + if (rec->found_csum_item && rec->nodatasum) + rec->errors |= I_ERR_ODD_CSUM_ITEM; + if (rec->some_csum_missing && !rec->nodatasum) + rec->errors |= I_ERR_SOME_CSUM_MISSING; + } + + BUG_ON(rec->refs != 1); + if (can_free_inode_rec(rec)) { + cache = lookup_cache_extent(inode_cache, rec->ino, 1); + node = container_of(cache, struct ptr_node, cache); + BUG_ON(node->data != rec); + remove_cache_extent(inode_cache, &node->cache); + free(node); + free_inode_rec(rec); + } +} + +static int check_orphan_item(struct btrfs_root *root, u64 ino) +{ + struct btrfs_path path; + struct btrfs_key key; + int ret; + + key.objectid = BTRFS_ORPHAN_OBJECTID; + key.type = BTRFS_ORPHAN_ITEM_KEY; + key.offset = ino; + + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); + btrfs_release_path(&path); + if (ret > 0) + ret = -ENOENT; + return ret; +} + +static int process_inode_item(struct extent_buffer *eb, + int slot, struct btrfs_key *key, + struct shared_node *active_node) +{ + struct inode_record *rec; + struct btrfs_inode_item *item; + + rec = active_node->current; + BUG_ON(rec->ino != key->objectid || rec->refs > 1); + if (rec->found_inode_item) { + rec->errors |= I_ERR_DUP_INODE_ITEM; + return 1; + } + item = btrfs_item_ptr(eb, slot, struct btrfs_inode_item); + rec->nlink = btrfs_inode_nlink(eb, item); + rec->isize = btrfs_inode_size(eb, item); + rec->nbytes = btrfs_inode_nbytes(eb, item); + rec->imode = btrfs_inode_mode(eb, item); + if (btrfs_inode_flags(eb, item) & BTRFS_INODE_NODATASUM) + rec->nodatasum = 1; + rec->found_inode_item = 1; + if (rec->nlink == 0) + rec->errors |= I_ERR_NO_ORPHAN_ITEM; + maybe_free_inode_rec(&active_node->inode_cache, rec); + return 0; +} + +static struct inode_backref *get_inode_backref(struct inode_record *rec, + const char *name, + int namelen, u64 dir) +{ + struct inode_backref *backref; + + list_for_each_entry(backref, &rec->backrefs, list) { + if (rec->ino == BTRFS_MULTIPLE_OBJECTIDS) + break; + if (backref->dir != dir || backref->namelen != namelen) + continue; + if (memcmp(name, backref->name, namelen)) + continue; + return backref; + } + + backref = malloc(sizeof(*backref) + namelen + 1); + if (!backref) + return NULL; + memset(backref, 0, sizeof(*backref)); + backref->dir = dir; + backref->namelen = namelen; + memcpy(backref->name, name, namelen); + backref->name[namelen] = '\0'; + list_add_tail(&backref->list, &rec->backrefs); + return backref; +} + +static int add_inode_backref(struct cache_tree *inode_cache, + u64 ino, u64 dir, u64 index, + const char *name, int namelen, + u8 filetype, u8 itemtype, int errors) +{ + struct inode_record *rec; + struct inode_backref *backref; + + rec = get_inode_rec(inode_cache, ino, 1); + BUG_ON(IS_ERR(rec)); + backref = get_inode_backref(rec, name, namelen, dir); + BUG_ON(!backref); + if (errors) + backref->errors |= errors; + if (itemtype == BTRFS_DIR_INDEX_KEY) { + if (backref->found_dir_index) + backref->errors |= REF_ERR_DUP_DIR_INDEX; + if (backref->found_inode_ref && backref->index != index) + backref->errors |= REF_ERR_INDEX_UNMATCH; + if (backref->found_dir_item && backref->filetype != filetype) + backref->errors |= REF_ERR_FILETYPE_UNMATCH; + + backref->index = index; + backref->filetype = filetype; + backref->found_dir_index = 1; + } else if (itemtype == BTRFS_DIR_ITEM_KEY) { + rec->found_link++; + if (backref->found_dir_item) + backref->errors |= REF_ERR_DUP_DIR_ITEM; + if (backref->found_dir_index && backref->filetype != filetype) + backref->errors |= REF_ERR_FILETYPE_UNMATCH; + + backref->filetype = filetype; + backref->found_dir_item = 1; + } else if ((itemtype == BTRFS_INODE_REF_KEY) || + (itemtype == BTRFS_INODE_EXTREF_KEY)) { + if (backref->found_inode_ref) + backref->errors |= REF_ERR_DUP_INODE_REF; + if (backref->found_dir_index && backref->index != index) + backref->errors |= REF_ERR_INDEX_UNMATCH; + else + backref->index = index; + + backref->ref_type = itemtype; + backref->found_inode_ref = 1; + } else { + BUG_ON(1); + } + + maybe_free_inode_rec(inode_cache, rec); + return 0; +} + +static int merge_inode_recs(struct inode_record *src, struct inode_record *dst, + struct cache_tree *dst_cache) +{ + struct inode_backref *backref; + u32 dir_count = 0; + int ret = 0; + + dst->merging = 1; + list_for_each_entry(backref, &src->backrefs, list) { + if (backref->found_dir_index) { + add_inode_backref(dst_cache, dst->ino, backref->dir, + backref->index, backref->name, + backref->namelen, backref->filetype, + BTRFS_DIR_INDEX_KEY, backref->errors); + } + if (backref->found_dir_item) { + dir_count++; + add_inode_backref(dst_cache, dst->ino, + backref->dir, 0, backref->name, + backref->namelen, backref->filetype, + BTRFS_DIR_ITEM_KEY, backref->errors); + } + if (backref->found_inode_ref) { + add_inode_backref(dst_cache, dst->ino, + backref->dir, backref->index, + backref->name, backref->namelen, 0, + backref->ref_type, backref->errors); + } + } + + if (src->found_dir_item) + dst->found_dir_item = 1; + if (src->found_file_extent) + dst->found_file_extent = 1; + if (src->found_csum_item) + dst->found_csum_item = 1; + if (src->some_csum_missing) + dst->some_csum_missing = 1; + if (first_extent_gap(&dst->holes) > first_extent_gap(&src->holes)) { + ret = copy_file_extent_holes(&dst->holes, &src->holes); + if (ret < 0) + return ret; + } + + BUG_ON(src->found_link < dir_count); + dst->found_link += src->found_link - dir_count; + dst->found_size += src->found_size; + if (src->extent_start != (u64)-1) { + if (dst->extent_start == (u64)-1) { + dst->extent_start = src->extent_start; + dst->extent_end = src->extent_end; + } else { + if (dst->extent_end > src->extent_start) + dst->errors |= I_ERR_FILE_EXTENT_OVERLAP; + else if (dst->extent_end < src->extent_start) { + ret = add_file_extent_hole(&dst->holes, + dst->extent_end, + src->extent_start - dst->extent_end); + } + if (dst->extent_end < src->extent_end) + dst->extent_end = src->extent_end; + } + } + + dst->errors |= src->errors; + if (src->found_inode_item) { + if (!dst->found_inode_item) { + dst->nlink = src->nlink; + dst->isize = src->isize; + dst->nbytes = src->nbytes; + dst->imode = src->imode; + dst->nodatasum = src->nodatasum; + dst->found_inode_item = 1; + } else { + dst->errors |= I_ERR_DUP_INODE_ITEM; + } + } + dst->merging = 0; + + return 0; +} + +static int splice_shared_node(struct shared_node *src_node, + struct shared_node *dst_node) +{ + struct cache_extent *cache; + struct ptr_node *node, *ins; + struct cache_tree *src, *dst; + struct inode_record *rec, *conflict; + u64 current_ino = 0; + int splice = 0; + int ret; + + if (--src_node->refs == 0) + splice = 1; + if (src_node->current) + current_ino = src_node->current->ino; + + src = &src_node->root_cache; + dst = &dst_node->root_cache; +again: + cache = search_cache_extent(src, 0); + while (cache) { + node = container_of(cache, struct ptr_node, cache); + rec = node->data; + cache = next_cache_extent(cache); + + if (splice) { + remove_cache_extent(src, &node->cache); + ins = node; + } else { + ins = malloc(sizeof(*ins)); + BUG_ON(!ins); + ins->cache.start = node->cache.start; + ins->cache.size = node->cache.size; + ins->data = rec; + rec->refs++; + } + ret = insert_cache_extent(dst, &ins->cache); + if (ret == -EEXIST) { + conflict = get_inode_rec(dst, rec->ino, 1); + BUG_ON(IS_ERR(conflict)); + merge_inode_recs(rec, conflict, dst); + if (rec->checked) { + conflict->checked = 1; + if (dst_node->current == conflict) + dst_node->current = NULL; + } + maybe_free_inode_rec(dst, conflict); + free_inode_rec(rec); + free(ins); + } else { + BUG_ON(ret); + } + } + + if (src == &src_node->root_cache) { + src = &src_node->inode_cache; + dst = &dst_node->inode_cache; + goto again; + } + + if (current_ino > 0 && (!dst_node->current || + current_ino > dst_node->current->ino)) { + if (dst_node->current) { + dst_node->current->checked = 1; + maybe_free_inode_rec(dst, dst_node->current); + } + dst_node->current = get_inode_rec(dst, current_ino, 1); + BUG_ON(IS_ERR(dst_node->current)); + } + return 0; +} + +static void free_inode_ptr(struct cache_extent *cache) +{ + struct ptr_node *node; + struct inode_record *rec; + + node = container_of(cache, struct ptr_node, cache); + rec = node->data; + free_inode_rec(rec); + free(node); +} + +FREE_EXTENT_CACHE_BASED_TREE(inode_recs, free_inode_ptr); + +static struct shared_node *find_shared_node(struct cache_tree *shared, + u64 bytenr) +{ + struct cache_extent *cache; + struct shared_node *node; + + cache = lookup_cache_extent(shared, bytenr, 1); + if (cache) { + node = container_of(cache, struct shared_node, cache); + return node; + } + return NULL; +} + +static int add_shared_node(struct cache_tree *shared, u64 bytenr, u32 refs) +{ + int ret; + struct shared_node *node; + + node = calloc(1, sizeof(*node)); + if (!node) + return -ENOMEM; + node->cache.start = bytenr; + node->cache.size = 1; + cache_tree_init(&node->root_cache); + cache_tree_init(&node->inode_cache); + node->refs = refs; + + ret = insert_cache_extent(shared, &node->cache); + + return ret; +} + +static int enter_shared_node(struct btrfs_root *root, u64 bytenr, u32 refs, + struct walk_control *wc, int level) +{ + struct shared_node *node; + struct shared_node *dest; + int ret; + + if (level == wc->active_node) + return 0; + + BUG_ON(wc->active_node <= level); + node = find_shared_node(&wc->shared, bytenr); + if (!node) { + ret = add_shared_node(&wc->shared, bytenr, refs); + BUG_ON(ret); + node = find_shared_node(&wc->shared, bytenr); + wc->nodes[level] = node; + wc->active_node = level; + return 0; + } + + if (wc->root_level == wc->active_node && + btrfs_root_refs(&root->root_item) == 0) { + if (--node->refs == 0) { + free_inode_recs_tree(&node->root_cache); + free_inode_recs_tree(&node->inode_cache); + remove_cache_extent(&wc->shared, &node->cache); + free(node); + } + return 1; + } + + dest = wc->nodes[wc->active_node]; + splice_shared_node(node, dest); + if (node->refs == 0) { + remove_cache_extent(&wc->shared, &node->cache); + free(node); + } + return 1; +} + +static int leave_shared_node(struct btrfs_root *root, + struct walk_control *wc, int level) +{ + struct shared_node *node; + struct shared_node *dest; + int i; + + if (level == wc->root_level) + return 0; + + for (i = level + 1; i < BTRFS_MAX_LEVEL; i++) { + if (wc->nodes[i]) + break; + } + BUG_ON(i >= BTRFS_MAX_LEVEL); + + node = wc->nodes[wc->active_node]; + wc->nodes[wc->active_node] = NULL; + wc->active_node = i; + + dest = wc->nodes[wc->active_node]; + if (wc->active_node < wc->root_level || + btrfs_root_refs(&root->root_item) > 0) { + BUG_ON(node->refs <= 1); + splice_shared_node(node, dest); + } else { + BUG_ON(node->refs < 2); + node->refs--; + } + return 0; +} + +/* + * Returns: + * < 0 - on error + * 1 - if the root with id child_root_id is a child of root parent_root_id + * 0 - if the root child_root_id isn't a child of the root parent_root_id but + * has other root(s) as parent(s) + * 2 - if the root child_root_id doesn't have any parent roots + */ +static int is_child_root(struct btrfs_root *root, u64 parent_root_id, + u64 child_root_id) +{ + struct btrfs_path path; + struct btrfs_key key; + struct extent_buffer *leaf; + int has_parent = 0; + int ret; + + btrfs_init_path(&path); + + key.objectid = parent_root_id; + key.type = BTRFS_ROOT_REF_KEY; + key.offset = child_root_id; + ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path, + 0, 0); + if (ret < 0) + return ret; + btrfs_release_path(&path); + if (!ret) + return 1; + + key.objectid = child_root_id; + key.type = BTRFS_ROOT_BACKREF_KEY; + key.offset = 0; + ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path, + 0, 0); + if (ret < 0) + goto out; + + while (1) { + leaf = path.nodes[0]; + if (path.slots[0] >= btrfs_header_nritems(leaf)) { + ret = btrfs_next_leaf(root->fs_info->tree_root, &path); + if (ret) + break; + leaf = path.nodes[0]; + } + + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.objectid != child_root_id || + key.type != BTRFS_ROOT_BACKREF_KEY) + break; + + has_parent = 1; + + if (key.offset == parent_root_id) { + btrfs_release_path(&path); + return 1; + } + + path.slots[0]++; + } +out: + btrfs_release_path(&path); + if (ret < 0) + return ret; + return has_parent ? 0 : 2; +} + +static int process_dir_item(struct extent_buffer *eb, + int slot, struct btrfs_key *key, + struct shared_node *active_node) +{ + u32 total; + u32 cur = 0; + u32 len; + u32 name_len; + u32 data_len; + int error; + int nritems = 0; + u8 filetype; + struct btrfs_dir_item *di; + struct inode_record *rec; + struct cache_tree *root_cache; + struct cache_tree *inode_cache; + struct btrfs_key location; + char namebuf[BTRFS_NAME_LEN]; + + root_cache = &active_node->root_cache; + inode_cache = &active_node->inode_cache; + rec = active_node->current; + rec->found_dir_item = 1; + + di = btrfs_item_ptr(eb, slot, struct btrfs_dir_item); + total = btrfs_item_size_nr(eb, slot); + while (cur < total) { + nritems++; + btrfs_dir_item_key_to_cpu(eb, di, &location); + name_len = btrfs_dir_name_len(eb, di); + data_len = btrfs_dir_data_len(eb, di); + filetype = btrfs_dir_type(eb, di); + + rec->found_size += name_len; + if (cur + sizeof(*di) + name_len > total || + name_len > BTRFS_NAME_LEN) { + error = REF_ERR_NAME_TOO_LONG; + + if (cur + sizeof(*di) > total) + break; + len = min_t(u32, total - cur - sizeof(*di), + BTRFS_NAME_LEN); + } else { + len = name_len; + error = 0; + } + + read_extent_buffer(eb, namebuf, (unsigned long)(di + 1), len); + + if (key->type == BTRFS_DIR_ITEM_KEY && + key->offset != btrfs_name_hash(namebuf, len)) { + rec->errors |= I_ERR_ODD_DIR_ITEM; + error("DIR_ITEM[%llu %llu] name %s namelen %u filetype %u mismatch with its hash, wanted %llu have %llu", + key->objectid, key->offset, namebuf, len, filetype, + key->offset, btrfs_name_hash(namebuf, len)); + } + + if (location.type == BTRFS_INODE_ITEM_KEY) { + add_inode_backref(inode_cache, location.objectid, + key->objectid, key->offset, namebuf, + len, filetype, key->type, error); + } else if (location.type == BTRFS_ROOT_ITEM_KEY) { + add_inode_backref(root_cache, location.objectid, + key->objectid, key->offset, + namebuf, len, filetype, + key->type, error); + } else { + fprintf(stderr, + "unknown location type %d in DIR_ITEM[%llu %llu]\n", + location.type, key->objectid, key->offset); + add_inode_backref(inode_cache, BTRFS_MULTIPLE_OBJECTIDS, + key->objectid, key->offset, namebuf, + len, filetype, key->type, error); + } + + len = sizeof(*di) + name_len + data_len; + di = (struct btrfs_dir_item *)((char *)di + len); + cur += len; + } + if (key->type == BTRFS_DIR_INDEX_KEY && nritems > 1) + rec->errors |= I_ERR_DUP_DIR_INDEX; + + return 0; +} + +static int process_inode_ref(struct extent_buffer *eb, + int slot, struct btrfs_key *key, + struct shared_node *active_node) +{ + u32 total; + u32 cur = 0; + u32 len; + u32 name_len; + u64 index; + int error; + struct cache_tree *inode_cache; + struct btrfs_inode_ref *ref; + char namebuf[BTRFS_NAME_LEN]; + + inode_cache = &active_node->inode_cache; + + ref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref); + total = btrfs_item_size_nr(eb, slot); + while (cur < total) { + name_len = btrfs_inode_ref_name_len(eb, ref); + index = btrfs_inode_ref_index(eb, ref); + + /* inode_ref + namelen should not cross item boundary */ + if (cur + sizeof(*ref) + name_len > total || + name_len > BTRFS_NAME_LEN) { + if (total < cur + sizeof(*ref)) + break; + + /* Still try to read out the remaining part */ + len = min_t(u32, total - cur - sizeof(*ref), + BTRFS_NAME_LEN); + error = REF_ERR_NAME_TOO_LONG; + } else { + len = name_len; + error = 0; + } + + read_extent_buffer(eb, namebuf, (unsigned long)(ref + 1), len); + add_inode_backref(inode_cache, key->objectid, key->offset, + index, namebuf, len, 0, key->type, error); + + len = sizeof(*ref) + name_len; + ref = (struct btrfs_inode_ref *)((char *)ref + len); + cur += len; + } + return 0; +} + +static int process_inode_extref(struct extent_buffer *eb, + int slot, struct btrfs_key *key, + struct shared_node *active_node) +{ + u32 total; + u32 cur = 0; + u32 len; + u32 name_len; + u64 index; + u64 parent; + int error; + struct cache_tree *inode_cache; + struct btrfs_inode_extref *extref; + char namebuf[BTRFS_NAME_LEN]; + + inode_cache = &active_node->inode_cache; + + extref = btrfs_item_ptr(eb, slot, struct btrfs_inode_extref); + total = btrfs_item_size_nr(eb, slot); + while (cur < total) { + name_len = btrfs_inode_extref_name_len(eb, extref); + index = btrfs_inode_extref_index(eb, extref); + parent = btrfs_inode_extref_parent(eb, extref); + if (name_len <= BTRFS_NAME_LEN) { + len = name_len; + error = 0; + } else { + len = BTRFS_NAME_LEN; + error = REF_ERR_NAME_TOO_LONG; + } + read_extent_buffer(eb, namebuf, + (unsigned long)(extref + 1), len); + add_inode_backref(inode_cache, key->objectid, parent, + index, namebuf, len, 0, key->type, error); + + len = sizeof(*extref) + name_len; + extref = (struct btrfs_inode_extref *)((char *)extref + len); + cur += len; + } + return 0; + +} + +static int process_file_extent(struct btrfs_root *root, + struct extent_buffer *eb, + int slot, struct btrfs_key *key, + struct shared_node *active_node) +{ + struct inode_record *rec; + struct btrfs_file_extent_item *fi; + u64 num_bytes = 0; + u64 disk_bytenr = 0; + u64 extent_offset = 0; + u64 mask = root->fs_info->sectorsize - 1; + int extent_type; + int ret; + + rec = active_node->current; + BUG_ON(rec->ino != key->objectid || rec->refs > 1); + rec->found_file_extent = 1; + + if (rec->extent_start == (u64)-1) { + rec->extent_start = key->offset; + rec->extent_end = key->offset; + } + + if (rec->extent_end > key->offset) + rec->errors |= I_ERR_FILE_EXTENT_OVERLAP; + else if (rec->extent_end < key->offset) { + ret = add_file_extent_hole(&rec->holes, rec->extent_end, + key->offset - rec->extent_end); + if (ret < 0) + return ret; + } + + fi = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); + extent_type = btrfs_file_extent_type(eb, fi); + + if (extent_type == BTRFS_FILE_EXTENT_INLINE) { + num_bytes = btrfs_file_extent_inline_len(eb, slot, fi); + if (num_bytes == 0) + rec->errors |= I_ERR_BAD_FILE_EXTENT; + rec->found_size += num_bytes; + num_bytes = (num_bytes + mask) & ~mask; + } else if (extent_type == BTRFS_FILE_EXTENT_REG || + extent_type == BTRFS_FILE_EXTENT_PREALLOC) { + num_bytes = btrfs_file_extent_num_bytes(eb, fi); + disk_bytenr = btrfs_file_extent_disk_bytenr(eb, fi); + extent_offset = btrfs_file_extent_offset(eb, fi); + if (num_bytes == 0 || (num_bytes & mask)) + rec->errors |= I_ERR_BAD_FILE_EXTENT; + if (num_bytes + extent_offset > + btrfs_file_extent_ram_bytes(eb, fi)) + rec->errors |= I_ERR_BAD_FILE_EXTENT; + if (extent_type == BTRFS_FILE_EXTENT_PREALLOC && + (btrfs_file_extent_compression(eb, fi) || + btrfs_file_extent_encryption(eb, fi) || + btrfs_file_extent_other_encoding(eb, fi))) + rec->errors |= I_ERR_BAD_FILE_EXTENT; + if (disk_bytenr > 0) + rec->found_size += num_bytes; + } else { + rec->errors |= I_ERR_BAD_FILE_EXTENT; + } + rec->extent_end = key->offset + num_bytes; + + /* + * The data reloc tree will copy full extents into its inode and then + * copy the corresponding csums. Because the extent it copied could be + * a preallocated extent that hasn't been written to yet there may be no + * csums to copy, ergo we won't have csums for our file extent. This is + * ok so just don't bother checking csums if the inode belongs to the + * data reloc tree. + */ + if (disk_bytenr > 0 && + btrfs_header_owner(eb) != BTRFS_DATA_RELOC_TREE_OBJECTID) { + u64 found; + if (btrfs_file_extent_compression(eb, fi)) + num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi); + else + disk_bytenr += extent_offset; + + ret = count_csum_range(root->fs_info, disk_bytenr, num_bytes, + &found); + if (ret < 0) + return ret; + if (extent_type == BTRFS_FILE_EXTENT_REG) { + if (found > 0) + rec->found_csum_item = 1; + if (found < num_bytes) + rec->some_csum_missing = 1; + } else if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { + if (found > 0) + rec->errors |= I_ERR_ODD_CSUM_ITEM; + } + } + return 0; +} + +static int process_one_leaf(struct btrfs_root *root, struct extent_buffer *eb, + struct walk_control *wc) +{ + struct btrfs_key key; + u32 nritems; + int i; + int ret = 0; + struct cache_tree *inode_cache; + struct shared_node *active_node; + + if (wc->root_level == wc->active_node && + btrfs_root_refs(&root->root_item) == 0) + return 0; + + active_node = wc->nodes[wc->active_node]; + inode_cache = &active_node->inode_cache; + nritems = btrfs_header_nritems(eb); + for (i = 0; i < nritems; i++) { + btrfs_item_key_to_cpu(eb, &key, i); + + if (key.objectid == BTRFS_FREE_SPACE_OBJECTID) + continue; + if (key.type == BTRFS_ORPHAN_ITEM_KEY) + continue; + + if (active_node->current == NULL || + active_node->current->ino < key.objectid) { + if (active_node->current) { + active_node->current->checked = 1; + maybe_free_inode_rec(inode_cache, + active_node->current); + } + active_node->current = get_inode_rec(inode_cache, + key.objectid, 1); + BUG_ON(IS_ERR(active_node->current)); + } + switch (key.type) { + case BTRFS_DIR_ITEM_KEY: + case BTRFS_DIR_INDEX_KEY: + ret = process_dir_item(eb, i, &key, active_node); + break; + case BTRFS_INODE_REF_KEY: + ret = process_inode_ref(eb, i, &key, active_node); + break; + case BTRFS_INODE_EXTREF_KEY: + ret = process_inode_extref(eb, i, &key, active_node); + break; + case BTRFS_INODE_ITEM_KEY: + ret = process_inode_item(eb, i, &key, active_node); + break; + case BTRFS_EXTENT_DATA_KEY: + ret = process_file_extent(root, eb, i, &key, + active_node); + break; + default: + break; + }; + } + return ret; +} + +static int walk_down_tree(struct btrfs_root *root, struct btrfs_path *path, + struct walk_control *wc, int *level, + struct node_refs *nrefs) +{ + enum btrfs_tree_block_status status; + u64 bytenr; + u64 ptr_gen; + struct btrfs_fs_info *fs_info = root->fs_info; + struct extent_buffer *next; + struct extent_buffer *cur; + int ret, err = 0; + u64 refs; + + WARN_ON(*level < 0); + WARN_ON(*level >= BTRFS_MAX_LEVEL); + + if (path->nodes[*level]->start == nrefs->bytenr[*level]) { + refs = nrefs->refs[*level]; + ret = 0; + } else { + ret = btrfs_lookup_extent_info(NULL, root, + path->nodes[*level]->start, + *level, 1, &refs, NULL); + if (ret < 0) { + err = ret; + goto out; + } + nrefs->bytenr[*level] = path->nodes[*level]->start; + nrefs->refs[*level] = refs; + } + + if (refs > 1) { + ret = enter_shared_node(root, path->nodes[*level]->start, + refs, wc, *level); + if (ret > 0) { + err = ret; + goto out; + } + } + + while (*level >= 0) { + WARN_ON(*level < 0); + WARN_ON(*level >= BTRFS_MAX_LEVEL); + cur = path->nodes[*level]; + + if (btrfs_header_level(cur) != *level) + WARN_ON(1); + + if (path->slots[*level] >= btrfs_header_nritems(cur)) + break; + if (*level == 0) { + ret = process_one_leaf(root, cur, wc); + if (ret < 0) + err = ret; + break; + } + bytenr = btrfs_node_blockptr(cur, path->slots[*level]); + ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); + + if (bytenr == nrefs->bytenr[*level - 1]) { + refs = nrefs->refs[*level - 1]; + } else { + ret = btrfs_lookup_extent_info(NULL, root, bytenr, + *level - 1, 1, &refs, NULL); + if (ret < 0) { + refs = 0; + } else { + nrefs->bytenr[*level - 1] = bytenr; + nrefs->refs[*level - 1] = refs; + } + } + + if (refs > 1) { + ret = enter_shared_node(root, bytenr, refs, + wc, *level - 1); + if (ret > 0) { + path->slots[*level]++; + continue; + } + } + + next = btrfs_find_tree_block(fs_info, bytenr, fs_info->nodesize); + if (!next || !btrfs_buffer_uptodate(next, ptr_gen)) { + free_extent_buffer(next); + reada_walk_down(root, cur, path->slots[*level]); + next = read_tree_block(root->fs_info, bytenr, ptr_gen); + if (!extent_buffer_uptodate(next)) { + struct btrfs_key node_key; + + btrfs_node_key_to_cpu(path->nodes[*level], + &node_key, + path->slots[*level]); + btrfs_add_corrupt_extent_record(root->fs_info, + &node_key, + path->nodes[*level]->start, + root->fs_info->nodesize, + *level); + err = -EIO; + goto out; + } + } + + ret = check_child_node(cur, path->slots[*level], next); + if (ret) { + free_extent_buffer(next); + err = ret; + goto out; + } + + if (btrfs_is_leaf(next)) + status = btrfs_check_leaf(root, NULL, next); + else + status = btrfs_check_node(root, NULL, next); + if (status != BTRFS_TREE_BLOCK_CLEAN) { + free_extent_buffer(next); + err = -EIO; + goto out; + } + + *level = *level - 1; + free_extent_buffer(path->nodes[*level]); + path->nodes[*level] = next; + path->slots[*level] = 0; + } +out: + path->slots[*level] = btrfs_header_nritems(path->nodes[*level]); + return err; +} + +static int walk_up_tree(struct btrfs_root *root, struct btrfs_path *path, + struct walk_control *wc, int *level) +{ + int i; + struct extent_buffer *leaf; + + for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { + leaf = path->nodes[i]; + if (path->slots[i] + 1 < btrfs_header_nritems(leaf)) { + path->slots[i]++; + *level = i; + return 0; + } + free_extent_buffer(path->nodes[*level]); + path->nodes[*level] = NULL; + BUG_ON(*level > wc->active_node); + if (*level == wc->active_node) + leave_shared_node(root, wc, *level); + *level = i + 1; + } + return 1; +} + +static int check_root_dir(struct inode_record *rec) +{ + struct inode_backref *backref; + int ret = -1; + + if (!rec->found_inode_item || rec->errors) + goto out; + if (rec->nlink != 1 || rec->found_link != 0) + goto out; + if (list_empty(&rec->backrefs)) + goto out; + backref = to_inode_backref(rec->backrefs.next); + if (!backref->found_inode_ref) + goto out; + if (backref->index != 0 || backref->namelen != 2 || + memcmp(backref->name, "..", 2)) + goto out; + if (backref->found_dir_index || backref->found_dir_item) + goto out; + ret = 0; +out: + return ret; +} + +static int repair_inode_isize(struct btrfs_trans_handle *trans, + struct btrfs_root *root, struct btrfs_path *path, + struct inode_record *rec) +{ + struct btrfs_inode_item *ei; + struct btrfs_key key; + int ret; + + key.objectid = rec->ino; + key.type = BTRFS_INODE_ITEM_KEY; + key.offset = (u64)-1; + + ret = btrfs_search_slot(trans, root, &key, path, 0, 1); + if (ret < 0) + goto out; + if (ret) { + if (!path->slots[0]) { + ret = -ENOENT; + goto out; + } + path->slots[0]--; + ret = 0; + } + btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); + if (key.objectid != rec->ino) { + ret = -ENOENT; + goto out; + } + + ei = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_inode_item); + btrfs_set_inode_size(path->nodes[0], ei, rec->found_size); + btrfs_mark_buffer_dirty(path->nodes[0]); + rec->errors &= ~I_ERR_DIR_ISIZE_WRONG; + printf("reset isize for dir %llu root %llu\n", rec->ino, + root->root_key.objectid); +out: + btrfs_release_path(path); + return ret; +} + +static int repair_inode_orphan_item(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct inode_record *rec) +{ + int ret; + + ret = btrfs_add_orphan_item(trans, root, path, rec->ino); + btrfs_release_path(path); + if (!ret) + rec->errors &= ~I_ERR_NO_ORPHAN_ITEM; + return ret; +} + +static int repair_inode_nbytes(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct inode_record *rec) +{ + struct btrfs_inode_item *ei; + struct btrfs_key key; + int ret = 0; + + key.objectid = rec->ino; + key.type = BTRFS_INODE_ITEM_KEY; + key.offset = 0; + + ret = btrfs_search_slot(trans, root, &key, path, 0, 1); + if (ret) { + if (ret > 0) + ret = -ENOENT; + goto out; + } + + /* Since ret == 0, no need to check anything */ + ei = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_inode_item); + btrfs_set_inode_nbytes(path->nodes[0], ei, rec->found_size); + btrfs_mark_buffer_dirty(path->nodes[0]); + rec->errors &= ~I_ERR_FILE_NBYTES_WRONG; + printf("reset nbytes for ino %llu root %llu\n", + rec->ino, root->root_key.objectid); +out: + btrfs_release_path(path); + return ret; +} + +static int add_missing_dir_index(struct btrfs_root *root, + struct cache_tree *inode_cache, + struct inode_record *rec, + struct inode_backref *backref) +{ + struct btrfs_path path; + struct btrfs_trans_handle *trans; + struct btrfs_dir_item *dir_item; + struct extent_buffer *leaf; + struct btrfs_key key; + struct btrfs_disk_key disk_key; + struct inode_record *dir_rec; + unsigned long name_ptr; + u32 data_size = sizeof(*dir_item) + backref->namelen; + int ret; + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); + + fprintf(stderr, "repairing missing dir index item for inode %llu\n", + (unsigned long long)rec->ino); + + btrfs_init_path(&path); + key.objectid = backref->dir; + key.type = BTRFS_DIR_INDEX_KEY; + key.offset = backref->index; + ret = btrfs_insert_empty_item(trans, root, &path, &key, data_size); + BUG_ON(ret); + + leaf = path.nodes[0]; + dir_item = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_dir_item); + + disk_key.objectid = cpu_to_le64(rec->ino); + disk_key.type = BTRFS_INODE_ITEM_KEY; + disk_key.offset = 0; + + btrfs_set_dir_item_key(leaf, dir_item, &disk_key); + btrfs_set_dir_type(leaf, dir_item, imode_to_type(rec->imode)); + btrfs_set_dir_data_len(leaf, dir_item, 0); + btrfs_set_dir_name_len(leaf, dir_item, backref->namelen); + name_ptr = (unsigned long)(dir_item + 1); + write_extent_buffer(leaf, backref->name, name_ptr, backref->namelen); + btrfs_mark_buffer_dirty(leaf); + btrfs_release_path(&path); + btrfs_commit_transaction(trans, root); + + backref->found_dir_index = 1; + dir_rec = get_inode_rec(inode_cache, backref->dir, 0); + BUG_ON(IS_ERR(dir_rec)); + if (!dir_rec) + return 0; + dir_rec->found_size += backref->namelen; + if (dir_rec->found_size == dir_rec->isize && + (dir_rec->errors & I_ERR_DIR_ISIZE_WRONG)) + dir_rec->errors &= ~I_ERR_DIR_ISIZE_WRONG; + if (dir_rec->found_size != dir_rec->isize) + dir_rec->errors |= I_ERR_DIR_ISIZE_WRONG; + + return 0; +} + +static int delete_dir_index(struct btrfs_root *root, + struct inode_backref *backref) +{ + struct btrfs_trans_handle *trans; + struct btrfs_dir_item *di; + struct btrfs_path path; + int ret = 0; + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); + + fprintf(stderr, "Deleting bad dir index [%llu,%u,%llu] root %llu\n", + (unsigned long long)backref->dir, + BTRFS_DIR_INDEX_KEY, (unsigned long long)backref->index, + (unsigned long long)root->objectid); + + btrfs_init_path(&path); + di = btrfs_lookup_dir_index(trans, root, &path, backref->dir, + backref->name, backref->namelen, + backref->index, -1); + if (IS_ERR(di)) { + ret = PTR_ERR(di); + btrfs_release_path(&path); + btrfs_commit_transaction(trans, root); + if (ret == -ENOENT) + return 0; + return ret; + } + + if (!di) + ret = btrfs_del_item(trans, root, &path); + else + ret = btrfs_delete_one_dir_name(trans, root, &path, di); + BUG_ON(ret); + btrfs_release_path(&path); + btrfs_commit_transaction(trans, root); + return ret; +} + +static int create_inode_item(struct btrfs_root *root, + struct inode_record *rec, int root_dir) +{ + struct btrfs_trans_handle *trans; + u64 nlink = 0; + u32 mode = 0; + u64 size = 0; + int ret; + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + return ret; + } + + nlink = root_dir ? 1 : rec->found_link; + if (rec->found_dir_item) { + if (rec->found_file_extent) + fprintf(stderr, "root %llu inode %llu has both a dir " + "item and extents, unsure if it is a dir or a " + "regular file so setting it as a directory\n", + (unsigned long long)root->objectid, + (unsigned long long)rec->ino); + mode = S_IFDIR | 0755; + size = rec->found_size; + } else if (!rec->found_dir_item) { + size = rec->extent_end; + mode = S_IFREG | 0755; + } + + ret = insert_inode_item(trans, root, rec->ino, size, rec->nbytes, + nlink, mode); + btrfs_commit_transaction(trans, root); + return 0; +} + +static int repair_inode_backrefs(struct btrfs_root *root, + struct inode_record *rec, + struct cache_tree *inode_cache, + int delete) +{ + struct inode_backref *tmp, *backref; + u64 root_dirid = btrfs_root_dirid(&root->root_item); + int ret = 0; + int repaired = 0; + + list_for_each_entry_safe(backref, tmp, &rec->backrefs, list) { + if (!delete && rec->ino == root_dirid) { + if (!rec->found_inode_item) { + ret = create_inode_item(root, rec, 1); + if (ret) + break; + repaired++; + } + } + + /* Index 0 for root dir's are special, don't mess with it */ + if (rec->ino == root_dirid && backref->index == 0) + continue; + + if (delete && + ((backref->found_dir_index && !backref->found_inode_ref) || + (backref->found_dir_index && backref->found_inode_ref && + (backref->errors & REF_ERR_INDEX_UNMATCH)))) { + ret = delete_dir_index(root, backref); + if (ret) + break; + repaired++; + list_del(&backref->list); + free(backref); + continue; + } + + if (!delete && !backref->found_dir_index && + backref->found_dir_item && backref->found_inode_ref) { + ret = add_missing_dir_index(root, inode_cache, rec, + backref); + if (ret) + break; + repaired++; + if (backref->found_dir_item && + backref->found_dir_index) { + if (!backref->errors && + backref->found_inode_ref) { + list_del(&backref->list); + free(backref); + continue; + } + } + } + + if (!delete && (!backref->found_dir_index && + !backref->found_dir_item && + backref->found_inode_ref)) { + struct btrfs_trans_handle *trans; + struct btrfs_key location; + + ret = check_dir_conflict(root, backref->name, + backref->namelen, + backref->dir, + backref->index); + if (ret) { + /* + * let nlink fixing routine to handle it, + * which can do it better. + */ + ret = 0; + break; + } + location.objectid = rec->ino; + location.type = BTRFS_INODE_ITEM_KEY; + location.offset = 0; + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + break; + } + fprintf(stderr, "adding missing dir index/item pair " + "for inode %llu\n", + (unsigned long long)rec->ino); + ret = btrfs_insert_dir_item(trans, root, backref->name, + backref->namelen, + backref->dir, &location, + imode_to_type(rec->imode), + backref->index); + BUG_ON(ret); + btrfs_commit_transaction(trans, root); + repaired++; + } + + if (!delete && (backref->found_inode_ref && + backref->found_dir_index && + backref->found_dir_item && + !(backref->errors & REF_ERR_INDEX_UNMATCH) && + !rec->found_inode_item)) { + ret = create_inode_item(root, rec, 0); + if (ret) + break; + repaired++; + } + + } + return ret ? ret : repaired; +} + +/* + * To determine the file type for nlink/inode_item repair + * + * Return 0 if file type is found and BTRFS_FT_* is stored into type. + * Return -ENOENT if file type is not found. + */ +static int find_file_type(struct inode_record *rec, u8 *type) +{ + struct inode_backref *backref; + + /* For inode item recovered case */ + if (rec->found_inode_item) { + *type = imode_to_type(rec->imode); + return 0; + } + + list_for_each_entry(backref, &rec->backrefs, list) { + if (backref->found_dir_index || backref->found_dir_item) { + *type = backref->filetype; + return 0; + } + } + return -ENOENT; +} + +/* + * To determine the file name for nlink repair + * + * Return 0 if file name is found, set name and namelen. + * Return -ENOENT if file name is not found. + */ +static int find_file_name(struct inode_record *rec, + char *name, int *namelen) +{ + struct inode_backref *backref; + + list_for_each_entry(backref, &rec->backrefs, list) { + if (backref->found_dir_index || backref->found_dir_item || + backref->found_inode_ref) { + memcpy(name, backref->name, backref->namelen); + *namelen = backref->namelen; + return 0; + } + } + return -ENOENT; +} + +/* Reset the nlink of the inode to the correct one */ +static int reset_nlink(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct inode_record *rec) +{ + struct inode_backref *backref; + struct inode_backref *tmp; + struct btrfs_key key; + struct btrfs_inode_item *inode_item; + int ret = 0; + + /* We don't believe this either, reset it and iterate backref */ + rec->found_link = 0; + + /* Remove all backref including the valid ones */ + list_for_each_entry_safe(backref, tmp, &rec->backrefs, list) { + ret = btrfs_unlink(trans, root, rec->ino, backref->dir, + backref->index, backref->name, + backref->namelen, 0); + if (ret < 0) + goto out; + + /* remove invalid backref, so it won't be added back */ + if (!(backref->found_dir_index && + backref->found_dir_item && + backref->found_inode_ref)) { + list_del(&backref->list); + free(backref); + } else { + rec->found_link++; + } + } + + /* Set nlink to 0 */ + key.objectid = rec->ino; + key.type = BTRFS_INODE_ITEM_KEY; + key.offset = 0; + ret = btrfs_search_slot(trans, root, &key, path, 0, 1); + if (ret < 0) + goto out; + if (ret > 0) { + ret = -ENOENT; + goto out; + } + inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_inode_item); + btrfs_set_inode_nlink(path->nodes[0], inode_item, 0); + btrfs_mark_buffer_dirty(path->nodes[0]); + btrfs_release_path(path); + + /* + * Add back valid inode_ref/dir_item/dir_index, + * add_link() will handle the nlink inc, so new nlink must be correct + */ + list_for_each_entry(backref, &rec->backrefs, list) { + ret = btrfs_add_link(trans, root, rec->ino, backref->dir, + backref->name, backref->namelen, + backref->filetype, &backref->index, 1, 0); + if (ret < 0) + goto out; + } +out: + btrfs_release_path(path); + return ret; +} + +static int repair_inode_nlinks(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct inode_record *rec) +{ + char namebuf[BTRFS_NAME_LEN] = {0}; + u8 type = 0; + int namelen = 0; + int name_recovered = 0; + int type_recovered = 0; + int ret = 0; + + /* + * Get file name and type first before these invalid inode ref + * are deleted by remove_all_invalid_backref() + */ + name_recovered = !find_file_name(rec, namebuf, &namelen); + type_recovered = !find_file_type(rec, &type); + + if (!name_recovered) { + printf("Can't get file name for inode %llu, using '%llu' as fallback\n", + rec->ino, rec->ino); + namelen = count_digits(rec->ino); + sprintf(namebuf, "%llu", rec->ino); + name_recovered = 1; + } + if (!type_recovered) { + printf("Can't get file type for inode %llu, using FILE as fallback\n", + rec->ino); + type = BTRFS_FT_REG_FILE; + type_recovered = 1; + } + + ret = reset_nlink(trans, root, path, rec); + if (ret < 0) { + fprintf(stderr, + "Failed to reset nlink for inode %llu: %s\n", + rec->ino, strerror(-ret)); + goto out; + } + + if (rec->found_link == 0) { + ret = link_inode_to_lostfound(trans, root, path, rec->ino, + namebuf, namelen, type, + (u64 *)&rec->found_link); + if (ret) + goto out; + } + printf("Fixed the nlink of inode %llu\n", rec->ino); +out: + /* + * Clear the flag anyway, or we will loop forever for the same inode + * as it will not be removed from the bad inode list and the dead loop + * happens. + */ + rec->errors &= ~I_ERR_LINK_COUNT_WRONG; + btrfs_release_path(path); + return ret; +} + +/* + * Check if there is any normal(reg or prealloc) file extent for given + * ino. + * This is used to determine the file type when neither its dir_index/item or + * inode_item exists. + * + * This will *NOT* report error, if any error happens, just consider it does + * not have any normal file extent. + */ +static int find_normal_file_extent(struct btrfs_root *root, u64 ino) +{ + struct btrfs_path path; + struct btrfs_key key; + struct btrfs_key found_key; + struct btrfs_file_extent_item *fi; + u8 type; + int ret = 0; + + btrfs_init_path(&path); + key.objectid = ino; + key.type = BTRFS_EXTENT_DATA_KEY; + key.offset = 0; + + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); + if (ret < 0) { + ret = 0; + goto out; + } + if (ret && path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { + ret = btrfs_next_leaf(root, &path); + if (ret) { + ret = 0; + goto out; + } + } + while (1) { + btrfs_item_key_to_cpu(path.nodes[0], &found_key, + path.slots[0]); + if (found_key.objectid != ino || + found_key.type != BTRFS_EXTENT_DATA_KEY) + break; + fi = btrfs_item_ptr(path.nodes[0], path.slots[0], + struct btrfs_file_extent_item); + type = btrfs_file_extent_type(path.nodes[0], fi); + if (type != BTRFS_FILE_EXTENT_INLINE) { + ret = 1; + goto out; + } + } +out: + btrfs_release_path(&path); + return ret; +} + +static u32 btrfs_type_to_imode(u8 type) +{ + static u32 imode_by_btrfs_type[] = { + [BTRFS_FT_REG_FILE] = S_IFREG, + [BTRFS_FT_DIR] = S_IFDIR, + [BTRFS_FT_CHRDEV] = S_IFCHR, + [BTRFS_FT_BLKDEV] = S_IFBLK, + [BTRFS_FT_FIFO] = S_IFIFO, + [BTRFS_FT_SOCK] = S_IFSOCK, + [BTRFS_FT_SYMLINK] = S_IFLNK, + }; + + return imode_by_btrfs_type[(type)]; +} + +static int repair_inode_no_item(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct inode_record *rec) +{ + u8 filetype; + u32 mode = 0700; + int type_recovered = 0; + int ret = 0; + + printf("Trying to rebuild inode:%llu\n", rec->ino); + + type_recovered = !find_file_type(rec, &filetype); + + /* + * Try to determine inode type if type not found. + * + * For found regular file extent, it must be FILE. + * For found dir_item/index, it must be DIR. + * + * For undetermined one, use FILE as fallback. + * + * TODO: + * 1. If found backref(inode_index/item is already handled) to it, + * it must be DIR. + * Need new inode-inode ref structure to allow search for that. + */ + if (!type_recovered) { + if (rec->found_file_extent && + find_normal_file_extent(root, rec->ino)) { + type_recovered = 1; + filetype = BTRFS_FT_REG_FILE; + } else if (rec->found_dir_item) { + type_recovered = 1; + filetype = BTRFS_FT_DIR; + } else if (!list_empty(&rec->orphan_extents)) { + type_recovered = 1; + filetype = BTRFS_FT_REG_FILE; + } else{ + printf("Can't determine the filetype for inode %llu, assume it is a normal file\n", + rec->ino); + type_recovered = 1; + filetype = BTRFS_FT_REG_FILE; + } + } + + ret = btrfs_new_inode(trans, root, rec->ino, + mode | btrfs_type_to_imode(filetype)); + if (ret < 0) + goto out; + + /* + * Here inode rebuild is done, we only rebuild the inode item, + * don't repair the nlink(like move to lost+found). + * That is the job of nlink repair. + * + * We just fill the record and return + */ + rec->found_dir_item = 1; + rec->imode = mode | btrfs_type_to_imode(filetype); + rec->nlink = 0; + rec->errors &= ~I_ERR_NO_INODE_ITEM; + /* Ensure the inode_nlinks repair function will be called */ + rec->errors |= I_ERR_LINK_COUNT_WRONG; +out: + return ret; +} + +static int repair_inode_orphan_extent(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct inode_record *rec) +{ + struct orphan_data_extent *orphan; + struct orphan_data_extent *tmp; + int ret = 0; + + list_for_each_entry_safe(orphan, tmp, &rec->orphan_extents, list) { + /* + * Check for conflicting file extents + * + * Here we don't know whether the extents is compressed or not, + * so we can only assume it not compressed nor data offset, + * and use its disk_len as extent length. + */ + ret = btrfs_get_extent(NULL, root, path, orphan->objectid, + orphan->offset, orphan->disk_len, 0); + btrfs_release_path(path); + if (ret < 0) + goto out; + if (!ret) { + fprintf(stderr, + "orphan extent (%llu, %llu) conflicts, delete the orphan\n", + orphan->disk_bytenr, orphan->disk_len); + ret = btrfs_free_extent(trans, + root->fs_info->extent_root, + orphan->disk_bytenr, orphan->disk_len, + 0, root->objectid, orphan->objectid, + orphan->offset); + if (ret < 0) + goto out; + } + ret = btrfs_insert_file_extent(trans, root, orphan->objectid, + orphan->offset, orphan->disk_bytenr, + orphan->disk_len, orphan->disk_len); + if (ret < 0) + goto out; + + /* Update file size info */ + rec->found_size += orphan->disk_len; + if (rec->found_size == rec->nbytes) + rec->errors &= ~I_ERR_FILE_NBYTES_WRONG; + + /* Update the file extent hole info too */ + ret = del_file_extent_hole(&rec->holes, orphan->offset, + orphan->disk_len); + if (ret < 0) + goto out; + if (RB_EMPTY_ROOT(&rec->holes)) + rec->errors &= ~I_ERR_FILE_EXTENT_DISCOUNT; + + list_del(&orphan->list); + free(orphan); + } + rec->errors &= ~I_ERR_FILE_EXTENT_ORPHAN; +out: + return ret; +} + +static int repair_inode_discount_extent(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + struct inode_record *rec) +{ + struct rb_node *node; + struct file_extent_hole *hole; + int found = 0; + int ret = 0; + + node = rb_first(&rec->holes); + + while (node) { + found = 1; + hole = rb_entry(node, struct file_extent_hole, node); + ret = btrfs_punch_hole(trans, root, rec->ino, + hole->start, hole->len); + if (ret < 0) + goto out; + ret = del_file_extent_hole(&rec->holes, hole->start, + hole->len); + if (ret < 0) + goto out; + if (RB_EMPTY_ROOT(&rec->holes)) + rec->errors &= ~I_ERR_FILE_EXTENT_DISCOUNT; + node = rb_first(&rec->holes); + } + /* special case for a file losing all its file extent */ + if (!found) { + ret = btrfs_punch_hole(trans, root, rec->ino, 0, + round_up(rec->isize, + root->fs_info->sectorsize)); + if (ret < 0) + goto out; + } + printf("Fixed discount file extents for inode: %llu in root: %llu\n", + rec->ino, root->objectid); +out: + return ret; +} + +static int try_repair_inode(struct btrfs_root *root, struct inode_record *rec) +{ + struct btrfs_trans_handle *trans; + struct btrfs_path path; + int ret = 0; + + if (!(rec->errors & (I_ERR_DIR_ISIZE_WRONG | + I_ERR_NO_ORPHAN_ITEM | + I_ERR_LINK_COUNT_WRONG | + I_ERR_NO_INODE_ITEM | + I_ERR_FILE_EXTENT_ORPHAN | + I_ERR_FILE_EXTENT_DISCOUNT| + I_ERR_FILE_NBYTES_WRONG))) + return rec->errors; + + /* + * For nlink repair, it may create a dir and add link, so + * 2 for parent(256)'s dir_index and dir_item + * 2 for lost+found dir's inode_item and inode_ref + * 1 for the new inode_ref of the file + * 2 for lost+found dir's dir_index and dir_item for the file + */ + trans = btrfs_start_transaction(root, 7); + if (IS_ERR(trans)) + return PTR_ERR(trans); + + btrfs_init_path(&path); + if (rec->errors & I_ERR_NO_INODE_ITEM) + ret = repair_inode_no_item(trans, root, &path, rec); + if (!ret && rec->errors & I_ERR_FILE_EXTENT_ORPHAN) + ret = repair_inode_orphan_extent(trans, root, &path, rec); + if (!ret && rec->errors & I_ERR_FILE_EXTENT_DISCOUNT) + ret = repair_inode_discount_extent(trans, root, &path, rec); + if (!ret && rec->errors & I_ERR_DIR_ISIZE_WRONG) + ret = repair_inode_isize(trans, root, &path, rec); + if (!ret && rec->errors & I_ERR_NO_ORPHAN_ITEM) + ret = repair_inode_orphan_item(trans, root, &path, rec); + if (!ret && rec->errors & I_ERR_LINK_COUNT_WRONG) + ret = repair_inode_nlinks(trans, root, &path, rec); + if (!ret && rec->errors & I_ERR_FILE_NBYTES_WRONG) + ret = repair_inode_nbytes(trans, root, &path, rec); + btrfs_commit_transaction(trans, root); + btrfs_release_path(&path); + return ret; +} + +static int check_inode_recs(struct btrfs_root *root, + struct cache_tree *inode_cache) +{ + struct cache_extent *cache; + struct ptr_node *node; + struct inode_record *rec; + struct inode_backref *backref; + int stage = 0; + int ret = 0; + int err = 0; + u64 error = 0; + u64 root_dirid = btrfs_root_dirid(&root->root_item); + + if (btrfs_root_refs(&root->root_item) == 0) { + if (!cache_tree_empty(inode_cache)) + fprintf(stderr, "warning line %d\n", __LINE__); + return 0; + } + + /* + * We need to repair backrefs first because we could change some of the + * errors in the inode recs. + * + * We also need to go through and delete invalid backrefs first and then + * add the correct ones second. We do this because we may get EEXIST + * when adding back the correct index because we hadn't yet deleted the + * invalid index. + * + * For example, if we were missing a dir index then the directories + * isize would be wrong, so if we fixed the isize to what we thought it + * would be and then fixed the backref we'd still have a invalid fs, so + * we need to add back the dir index and then check to see if the isize + * is still wrong. + */ + while (stage < 3) { + stage++; + if (stage == 3 && !err) + break; + + cache = search_cache_extent(inode_cache, 0); + while (repair && cache) { + node = container_of(cache, struct ptr_node, cache); + rec = node->data; + cache = next_cache_extent(cache); + + /* Need to free everything up and rescan */ + if (stage == 3) { + remove_cache_extent(inode_cache, &node->cache); + free(node); + free_inode_rec(rec); + continue; + } + + if (list_empty(&rec->backrefs)) + continue; + + ret = repair_inode_backrefs(root, rec, inode_cache, + stage == 1); + if (ret < 0) { + err = ret; + stage = 2; + break; + } if (ret > 0) { + err = -EAGAIN; + } + } + } + if (err) + return err; + + rec = get_inode_rec(inode_cache, root_dirid, 0); + BUG_ON(IS_ERR(rec)); + if (rec) { + ret = check_root_dir(rec); + if (ret) { + fprintf(stderr, "root %llu root dir %llu error\n", + (unsigned long long)root->root_key.objectid, + (unsigned long long)root_dirid); + print_inode_error(root, rec); + error++; + } + } else { + if (repair) { + struct btrfs_trans_handle *trans; + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) { + err = PTR_ERR(trans); + return err; + } + + fprintf(stderr, + "root %llu missing its root dir, recreating\n", + (unsigned long long)root->objectid); + + ret = btrfs_make_root_dir(trans, root, root_dirid); + BUG_ON(ret); + + btrfs_commit_transaction(trans, root); + return -EAGAIN; + } + + fprintf(stderr, "root %llu root dir %llu not found\n", + (unsigned long long)root->root_key.objectid, + (unsigned long long)root_dirid); + } + + while (1) { + cache = search_cache_extent(inode_cache, 0); + if (!cache) + break; + node = container_of(cache, struct ptr_node, cache); + rec = node->data; + remove_cache_extent(inode_cache, &node->cache); + free(node); + if (rec->ino == root_dirid || + rec->ino == BTRFS_ORPHAN_OBJECTID) { + free_inode_rec(rec); + continue; + } + + if (rec->errors & I_ERR_NO_ORPHAN_ITEM) { + ret = check_orphan_item(root, rec->ino); + if (ret == 0) + rec->errors &= ~I_ERR_NO_ORPHAN_ITEM; + if (can_free_inode_rec(rec)) { + free_inode_rec(rec); + continue; + } + } + + if (!rec->found_inode_item) + rec->errors |= I_ERR_NO_INODE_ITEM; + if (rec->found_link != rec->nlink) + rec->errors |= I_ERR_LINK_COUNT_WRONG; + if (repair) { + ret = try_repair_inode(root, rec); + if (ret == 0 && can_free_inode_rec(rec)) { + free_inode_rec(rec); + continue; + } + ret = 0; + } + + if (!(repair && ret == 0)) + error++; + print_inode_error(root, rec); + list_for_each_entry(backref, &rec->backrefs, list) { + if (!backref->found_dir_item) + backref->errors |= REF_ERR_NO_DIR_ITEM; + if (!backref->found_dir_index) + backref->errors |= REF_ERR_NO_DIR_INDEX; + if (!backref->found_inode_ref) + backref->errors |= REF_ERR_NO_INODE_REF; + fprintf(stderr, "\tunresolved ref dir %llu index %llu" + " namelen %u name %s filetype %d errors %x", + (unsigned long long)backref->dir, + (unsigned long long)backref->index, + backref->namelen, backref->name, + backref->filetype, backref->errors); + print_ref_error(backref->errors); + } + free_inode_rec(rec); + } + return (error > 0) ? -1 : 0; +} + +static struct root_record *get_root_rec(struct cache_tree *root_cache, + u64 objectid) +{ + struct cache_extent *cache; + struct root_record *rec = NULL; + int ret; + + cache = lookup_cache_extent(root_cache, objectid, 1); + if (cache) { + rec = container_of(cache, struct root_record, cache); + } else { + rec = calloc(1, sizeof(*rec)); + if (!rec) + return ERR_PTR(-ENOMEM); + rec->objectid = objectid; + INIT_LIST_HEAD(&rec->backrefs); + rec->cache.start = objectid; + rec->cache.size = 1; + + ret = insert_cache_extent(root_cache, &rec->cache); + if (ret) + return ERR_PTR(-EEXIST); + } + return rec; +} + +static struct root_backref *get_root_backref(struct root_record *rec, + u64 ref_root, u64 dir, u64 index, + const char *name, int namelen) +{ + struct root_backref *backref; + + list_for_each_entry(backref, &rec->backrefs, list) { + if (backref->ref_root != ref_root || backref->dir != dir || + backref->namelen != namelen) + continue; + if (memcmp(name, backref->name, namelen)) + continue; + return backref; + } + + backref = calloc(1, sizeof(*backref) + namelen + 1); + if (!backref) + return NULL; + backref->ref_root = ref_root; + backref->dir = dir; + backref->index = index; + backref->namelen = namelen; + memcpy(backref->name, name, namelen); + backref->name[namelen] = '\0'; + list_add_tail(&backref->list, &rec->backrefs); + return backref; +} + +static void free_root_record(struct cache_extent *cache) +{ + struct root_record *rec; + struct root_backref *backref; + + rec = container_of(cache, struct root_record, cache); + while (!list_empty(&rec->backrefs)) { + backref = to_root_backref(rec->backrefs.next); + list_del(&backref->list); + free(backref); + } + + free(rec); +} + +FREE_EXTENT_CACHE_BASED_TREE(root_recs, free_root_record); + +static int add_root_backref(struct cache_tree *root_cache, + u64 root_id, u64 ref_root, u64 dir, u64 index, + const char *name, int namelen, + int item_type, int errors) +{ + struct root_record *rec; + struct root_backref *backref; + + rec = get_root_rec(root_cache, root_id); + BUG_ON(IS_ERR(rec)); + backref = get_root_backref(rec, ref_root, dir, index, name, namelen); + BUG_ON(!backref); + + backref->errors |= errors; + + if (item_type != BTRFS_DIR_ITEM_KEY) { + if (backref->found_dir_index || backref->found_back_ref || + backref->found_forward_ref) { + if (backref->index != index) + backref->errors |= REF_ERR_INDEX_UNMATCH; + } else { + backref->index = index; + } + } + + if (item_type == BTRFS_DIR_ITEM_KEY) { + if (backref->found_forward_ref) + rec->found_ref++; + backref->found_dir_item = 1; + } else if (item_type == BTRFS_DIR_INDEX_KEY) { + backref->found_dir_index = 1; + } else if (item_type == BTRFS_ROOT_REF_KEY) { + if (backref->found_forward_ref) + backref->errors |= REF_ERR_DUP_ROOT_REF; + else if (backref->found_dir_item) + rec->found_ref++; + backref->found_forward_ref = 1; + } else if (item_type == BTRFS_ROOT_BACKREF_KEY) { + if (backref->found_back_ref) + backref->errors |= REF_ERR_DUP_ROOT_BACKREF; + backref->found_back_ref = 1; + } else { + BUG_ON(1); + } + + if (backref->found_forward_ref && backref->found_dir_item) + backref->reachable = 1; + return 0; +} + +static int merge_root_recs(struct btrfs_root *root, + struct cache_tree *src_cache, + struct cache_tree *dst_cache) +{ + struct cache_extent *cache; + struct ptr_node *node; + struct inode_record *rec; + struct inode_backref *backref; + int ret = 0; + + if (root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID) { + free_inode_recs_tree(src_cache); + return 0; + } + + while (1) { + cache = search_cache_extent(src_cache, 0); + if (!cache) + break; + node = container_of(cache, struct ptr_node, cache); + rec = node->data; + remove_cache_extent(src_cache, &node->cache); + free(node); + + ret = is_child_root(root, root->objectid, rec->ino); + if (ret < 0) + break; + else if (ret == 0) + goto skip; + + list_for_each_entry(backref, &rec->backrefs, list) { + BUG_ON(backref->found_inode_ref); + if (backref->found_dir_item) + add_root_backref(dst_cache, rec->ino, + root->root_key.objectid, backref->dir, + backref->index, backref->name, + backref->namelen, BTRFS_DIR_ITEM_KEY, + backref->errors); + if (backref->found_dir_index) + add_root_backref(dst_cache, rec->ino, + root->root_key.objectid, backref->dir, + backref->index, backref->name, + backref->namelen, BTRFS_DIR_INDEX_KEY, + backref->errors); + } +skip: + free_inode_rec(rec); + } + if (ret < 0) + return ret; + return 0; +} + +static int check_root_refs(struct btrfs_root *root, + struct cache_tree *root_cache) +{ + struct root_record *rec; + struct root_record *ref_root; + struct root_backref *backref; + struct cache_extent *cache; + int loop = 1; + int ret; + int error; + int errors = 0; + + rec = get_root_rec(root_cache, BTRFS_FS_TREE_OBJECTID); + BUG_ON(IS_ERR(rec)); + rec->found_ref = 1; + + /* fixme: this can not detect circular references */ + while (loop) { + loop = 0; + cache = search_cache_extent(root_cache, 0); + while (1) { + if (!cache) + break; + rec = container_of(cache, struct root_record, cache); + cache = next_cache_extent(cache); + + if (rec->found_ref == 0) + continue; + + list_for_each_entry(backref, &rec->backrefs, list) { + if (!backref->reachable) + continue; + + ref_root = get_root_rec(root_cache, + backref->ref_root); + BUG_ON(IS_ERR(ref_root)); + if (ref_root->found_ref > 0) + continue; + + backref->reachable = 0; + rec->found_ref--; + if (rec->found_ref == 0) + loop = 1; + } + } + } + + cache = search_cache_extent(root_cache, 0); + while (1) { + if (!cache) + break; + rec = container_of(cache, struct root_record, cache); + cache = next_cache_extent(cache); + + if (rec->found_ref == 0 && + rec->objectid >= BTRFS_FIRST_FREE_OBJECTID && + rec->objectid <= BTRFS_LAST_FREE_OBJECTID) { + ret = check_orphan_item(root->fs_info->tree_root, + rec->objectid); + if (ret == 0) + continue; + + /* + * If we don't have a root item then we likely just have + * a dir item in a snapshot for this root but no actual + * ref key or anything so it's meaningless. + */ + if (!rec->found_root_item) + continue; + errors++; + fprintf(stderr, "fs tree %llu not referenced\n", + (unsigned long long)rec->objectid); + } + + error = 0; + if (rec->found_ref > 0 && !rec->found_root_item) + error = 1; + list_for_each_entry(backref, &rec->backrefs, list) { + if (!backref->found_dir_item) + backref->errors |= REF_ERR_NO_DIR_ITEM; + if (!backref->found_dir_index) + backref->errors |= REF_ERR_NO_DIR_INDEX; + if (!backref->found_back_ref) + backref->errors |= REF_ERR_NO_ROOT_BACKREF; + if (!backref->found_forward_ref) + backref->errors |= REF_ERR_NO_ROOT_REF; + if (backref->reachable && backref->errors) + error = 1; + } + if (!error) + continue; + + errors++; + fprintf(stderr, "fs tree %llu refs %u %s\n", + (unsigned long long)rec->objectid, rec->found_ref, + rec->found_root_item ? "" : "not found"); + + list_for_each_entry(backref, &rec->backrefs, list) { + if (!backref->reachable) + continue; + if (!backref->errors && rec->found_root_item) + continue; + fprintf(stderr, "\tunresolved ref root %llu dir %llu" + " index %llu namelen %u name %s errors %x\n", + (unsigned long long)backref->ref_root, + (unsigned long long)backref->dir, + (unsigned long long)backref->index, + backref->namelen, backref->name, + backref->errors); + print_ref_error(backref->errors); + } + } + return errors > 0 ? 1 : 0; +} + +static int process_root_ref(struct extent_buffer *eb, int slot, + struct btrfs_key *key, + struct cache_tree *root_cache) +{ + u64 dirid; + u64 index; + u32 len; + u32 name_len; + struct btrfs_root_ref *ref; + char namebuf[BTRFS_NAME_LEN]; + int error; + + ref = btrfs_item_ptr(eb, slot, struct btrfs_root_ref); + + dirid = btrfs_root_ref_dirid(eb, ref); + index = btrfs_root_ref_sequence(eb, ref); + name_len = btrfs_root_ref_name_len(eb, ref); + + if (name_len <= BTRFS_NAME_LEN) { + len = name_len; + error = 0; + } else { + len = BTRFS_NAME_LEN; + error = REF_ERR_NAME_TOO_LONG; + } + read_extent_buffer(eb, namebuf, (unsigned long)(ref + 1), len); + + if (key->type == BTRFS_ROOT_REF_KEY) { + add_root_backref(root_cache, key->offset, key->objectid, dirid, + index, namebuf, len, key->type, error); + } else { + add_root_backref(root_cache, key->objectid, key->offset, dirid, + index, namebuf, len, key->type, error); + } + return 0; +} + +static void free_corrupt_block(struct cache_extent *cache) +{ + struct btrfs_corrupt_block *corrupt; + + corrupt = container_of(cache, struct btrfs_corrupt_block, cache); + free(corrupt); +} + +FREE_EXTENT_CACHE_BASED_TREE(corrupt_blocks, free_corrupt_block); + +/* + * Repair the btree of the given root. + * + * The fix is to remove the node key in corrupt_blocks cache_tree. + * and rebalance the tree. + * After the fix, the btree should be writeable. + */ +static int repair_btree(struct btrfs_root *root, + struct cache_tree *corrupt_blocks) +{ + struct btrfs_trans_handle *trans; + struct btrfs_path path; + struct btrfs_corrupt_block *corrupt; + struct cache_extent *cache; + struct btrfs_key key; + u64 offset; + int level; + int ret = 0; + + if (cache_tree_empty(corrupt_blocks)) + return 0; + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + fprintf(stderr, "Error starting transaction: %s\n", + strerror(-ret)); + return ret; + } + btrfs_init_path(&path); + cache = first_cache_extent(corrupt_blocks); + while (cache) { + corrupt = container_of(cache, struct btrfs_corrupt_block, + cache); + level = corrupt->level; + path.lowest_level = level; + key.objectid = corrupt->key.objectid; + key.type = corrupt->key.type; + key.offset = corrupt->key.offset; + + /* + * Here we don't want to do any tree balance, since it may + * cause a balance with corrupted brother leaf/node, + * so ins_len set to 0 here. + * Balance will be done after all corrupt node/leaf is deleted. + */ + ret = btrfs_search_slot(trans, root, &key, &path, 0, 1); + if (ret < 0) + goto out; + offset = btrfs_node_blockptr(path.nodes[level], + path.slots[level]); + + /* Remove the ptr */ + ret = btrfs_del_ptr(root, &path, level, path.slots[level]); + if (ret < 0) + goto out; + /* + * Remove the corresponding extent + * return value is not concerned. + */ + btrfs_release_path(&path); + ret = btrfs_free_extent(trans, root, offset, + root->fs_info->nodesize, 0, + root->root_key.objectid, level - 1, 0); + cache = next_cache_extent(cache); + } + + /* Balance the btree using btrfs_search_slot() */ + cache = first_cache_extent(corrupt_blocks); + while (cache) { + corrupt = container_of(cache, struct btrfs_corrupt_block, + cache); + memcpy(&key, &corrupt->key, sizeof(key)); + ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); + if (ret < 0) + goto out; + /* return will always >0 since it won't find the item */ + ret = 0; + btrfs_release_path(&path); + cache = next_cache_extent(cache); + } +out: + btrfs_commit_transaction(trans, root); + btrfs_release_path(&path); + return ret; +} + +static int check_fs_root(struct btrfs_root *root, + struct cache_tree *root_cache, + struct walk_control *wc) +{ + int ret = 0; + int err = 0; + int wret; + int level; + struct btrfs_path path; + struct shared_node root_node; + struct root_record *rec; + struct btrfs_root_item *root_item = &root->root_item; + struct cache_tree corrupt_blocks; + struct orphan_data_extent *orphan; + struct orphan_data_extent *tmp; + enum btrfs_tree_block_status status; + struct node_refs nrefs; + + /* + * Reuse the corrupt_block cache tree to record corrupted tree block + * + * Unlike the usage in extent tree check, here we do it in a per + * fs/subvol tree base. + */ + cache_tree_init(&corrupt_blocks); + root->fs_info->corrupt_blocks = &corrupt_blocks; + + if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { + rec = get_root_rec(root_cache, root->root_key.objectid); + BUG_ON(IS_ERR(rec)); + if (btrfs_root_refs(root_item) > 0) + rec->found_root_item = 1; + } + + btrfs_init_path(&path); + memset(&root_node, 0, sizeof(root_node)); + cache_tree_init(&root_node.root_cache); + cache_tree_init(&root_node.inode_cache); + memset(&nrefs, 0, sizeof(nrefs)); + + /* Move the orphan extent record to corresponding inode_record */ + list_for_each_entry_safe(orphan, tmp, + &root->orphan_data_extents, list) { + struct inode_record *inode; + + inode = get_inode_rec(&root_node.inode_cache, orphan->objectid, + 1); + BUG_ON(IS_ERR(inode)); + inode->errors |= I_ERR_FILE_EXTENT_ORPHAN; + list_move(&orphan->list, &inode->orphan_extents); + } + + level = btrfs_header_level(root->node); + memset(wc->nodes, 0, sizeof(wc->nodes)); + wc->nodes[level] = &root_node; + wc->active_node = level; + wc->root_level = level; + + /* We may not have checked the root block, lets do that now */ + if (btrfs_is_leaf(root->node)) + status = btrfs_check_leaf(root, NULL, root->node); + else + status = btrfs_check_node(root, NULL, root->node); + if (status != BTRFS_TREE_BLOCK_CLEAN) + return -EIO; + + if (btrfs_root_refs(root_item) > 0 || + btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { + path.nodes[level] = root->node; + extent_buffer_get(root->node); + path.slots[level] = 0; + } else { + struct btrfs_key key; + struct btrfs_disk_key found_key; + + btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); + level = root_item->drop_level; + path.lowest_level = level; + if (level > btrfs_header_level(root->node) || + level >= BTRFS_MAX_LEVEL) { + error("ignoring invalid drop level: %u", level); + goto skip_walking; + } + wret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); + if (wret < 0) + goto skip_walking; + btrfs_node_key(path.nodes[level], &found_key, + path.slots[level]); + WARN_ON(memcmp(&found_key, &root_item->drop_progress, + sizeof(found_key))); + } + + while (1) { + wret = walk_down_tree(root, &path, wc, &level, &nrefs); + if (wret < 0) + ret = wret; + if (wret != 0) + break; + + wret = walk_up_tree(root, &path, wc, &level); + if (wret < 0) + ret = wret; + if (wret != 0) + break; + } +skip_walking: + btrfs_release_path(&path); + + if (!cache_tree_empty(&corrupt_blocks)) { + struct cache_extent *cache; + struct btrfs_corrupt_block *corrupt; + + printf("The following tree block(s) is corrupted in tree %llu:\n", + root->root_key.objectid); + cache = first_cache_extent(&corrupt_blocks); + while (cache) { + corrupt = container_of(cache, + struct btrfs_corrupt_block, + cache); + printf("\ttree block bytenr: %llu, level: %d, node key: (%llu, %u, %llu)\n", + cache->start, corrupt->level, + corrupt->key.objectid, corrupt->key.type, + corrupt->key.offset); + cache = next_cache_extent(cache); + } + if (repair) { + printf("Try to repair the btree for root %llu\n", + root->root_key.objectid); + ret = repair_btree(root, &corrupt_blocks); + if (ret < 0) + fprintf(stderr, "Failed to repair btree: %s\n", + strerror(-ret)); + if (!ret) + printf("Btree for root %llu is fixed\n", + root->root_key.objectid); + } + } + + err = merge_root_recs(root, &root_node.root_cache, root_cache); + if (err < 0) + ret = err; + + if (root_node.current) { + root_node.current->checked = 1; + maybe_free_inode_rec(&root_node.inode_cache, + root_node.current); + } + + err = check_inode_recs(root, &root_node.inode_cache); + if (!ret) + ret = err; + + free_corrupt_blocks_tree(&corrupt_blocks); + root->fs_info->corrupt_blocks = NULL; + free_orphan_data_extents(&root->orphan_data_extents); + return ret; +} + +static int check_fs_roots(struct btrfs_fs_info *fs_info, + struct cache_tree *root_cache) +{ + struct btrfs_path path; + struct btrfs_key key; + struct walk_control wc; + struct extent_buffer *leaf, *tree_node; + struct btrfs_root *tmp_root; + struct btrfs_root *tree_root = fs_info->tree_root; + int ret; + int err = 0; + + if (ctx.progress_enabled) { + ctx.tp = TASK_FS_ROOTS; + task_start(ctx.info); + } + + /* + * Just in case we made any changes to the extent tree that weren't + * reflected into the free space cache yet. + */ + if (repair) + reset_cached_block_groups(fs_info); + memset(&wc, 0, sizeof(wc)); + cache_tree_init(&wc.shared); + btrfs_init_path(&path); + +again: + key.offset = 0; + key.objectid = 0; + key.type = BTRFS_ROOT_ITEM_KEY; + ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0); + if (ret < 0) { + err = 1; + goto out; + } + tree_node = tree_root->node; + while (1) { + if (tree_node != tree_root->node) { + free_root_recs_tree(root_cache); + btrfs_release_path(&path); + goto again; + } + leaf = path.nodes[0]; + if (path.slots[0] >= btrfs_header_nritems(leaf)) { + ret = btrfs_next_leaf(tree_root, &path); + if (ret) { + if (ret < 0) + err = 1; + break; + } + leaf = path.nodes[0]; + } + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.type == BTRFS_ROOT_ITEM_KEY && + fs_root_objectid(key.objectid)) { + if (key.objectid == BTRFS_TREE_RELOC_OBJECTID) { + tmp_root = btrfs_read_fs_root_no_cache( + fs_info, &key); + } else { + key.offset = (u64)-1; + tmp_root = btrfs_read_fs_root( + fs_info, &key); + } + if (IS_ERR(tmp_root)) { + err = 1; + goto next; + } + ret = check_fs_root(tmp_root, root_cache, &wc); + if (ret == -EAGAIN) { + free_root_recs_tree(root_cache); + btrfs_release_path(&path); + goto again; + } + if (ret) + err = 1; + if (key.objectid == BTRFS_TREE_RELOC_OBJECTID) + btrfs_free_fs_root(tmp_root); + } else if (key.type == BTRFS_ROOT_REF_KEY || + key.type == BTRFS_ROOT_BACKREF_KEY) { + process_root_ref(leaf, path.slots[0], &key, + root_cache); + } +next: + path.slots[0]++; + } +out: + btrfs_release_path(&path); + if (err) + free_extent_cache_tree(&wc.shared); + if (!cache_tree_empty(&wc.shared)) + fprintf(stderr, "warning line %d\n", __LINE__); + + task_stop(ctx.info); + + return err; +} + +static struct tree_backref *find_tree_backref(struct extent_record *rec, + u64 parent, u64 root) +{ + struct rb_node *node; + struct tree_backref *back = NULL; + struct tree_backref match = { + .node = { + .is_data = 0, + }, + }; + + if (parent) { + match.parent = parent; + match.node.full_backref = 1; + } else { + match.root = root; + } + + node = rb_search(&rec->backref_tree, &match.node.node, + (rb_compare_keys)compare_extent_backref, NULL); + if (node) + back = to_tree_backref(rb_node_to_extent_backref(node)); + + return back; +} + +static struct data_backref *find_data_backref(struct extent_record *rec, + u64 parent, u64 root, + u64 owner, u64 offset, + int found_ref, + u64 disk_bytenr, u64 bytes) +{ + struct rb_node *node; + struct data_backref *back = NULL; + struct data_backref match = { + .node = { + .is_data = 1, + }, + .owner = owner, + .offset = offset, + .bytes = bytes, + .found_ref = found_ref, + .disk_bytenr = disk_bytenr, + }; + + if (parent) { + match.parent = parent; + match.node.full_backref = 1; + } else { + match.root = root; + } + + node = rb_search(&rec->backref_tree, &match.node.node, + (rb_compare_keys)compare_extent_backref, NULL); + if (node) + back = to_data_backref(rb_node_to_extent_backref(node)); + + return back; +} + +static int do_check_fs_roots(struct btrfs_fs_info *fs_info, + struct cache_tree *root_cache) +{ + int ret; + + if (!ctx.progress_enabled) + fprintf(stderr, "checking fs roots\n"); + if (check_mode == CHECK_MODE_LOWMEM) + ret = check_fs_roots_lowmem(fs_info); + else + ret = check_fs_roots(fs_info, root_cache); + + return ret; +} + +static int all_backpointers_checked(struct extent_record *rec, int print_errs) +{ + struct extent_backref *back, *tmp; + struct tree_backref *tback; + struct data_backref *dback; + u64 found = 0; + int err = 0; + + rbtree_postorder_for_each_entry_safe(back, tmp, + &rec->backref_tree, node) { + if (!back->found_extent_tree) { + err = 1; + if (!print_errs) + goto out; + if (back->is_data) { + dback = to_data_backref(back); + fprintf(stderr, +"data backref %llu %s %llu owner %llu offset %llu num_refs %lu not found in extent tree\n", + (unsigned long long)rec->start, + back->full_backref ? + "parent" : "root", + back->full_backref ? + (unsigned long long)dback->parent : + (unsigned long long)dback->root, + (unsigned long long)dback->owner, + (unsigned long long)dback->offset, + (unsigned long)dback->num_refs); + } else { + tback = to_tree_backref(back); + fprintf(stderr, +"tree backref %llu parent %llu root %llu not found in extent tree\n", + (unsigned long long)rec->start, + (unsigned long long)tback->parent, + (unsigned long long)tback->root); + } + } + if (!back->is_data && !back->found_ref) { + err = 1; + if (!print_errs) + goto out; + tback = to_tree_backref(back); + fprintf(stderr, + "backref %llu %s %llu not referenced back %p\n", + (unsigned long long)rec->start, + back->full_backref ? "parent" : "root", + back->full_backref ? + (unsigned long long)tback->parent : + (unsigned long long)tback->root, back); + } + if (back->is_data) { + dback = to_data_backref(back); + if (dback->found_ref != dback->num_refs) { + err = 1; + if (!print_errs) + goto out; + fprintf(stderr, +"incorrect local backref count on %llu %s %llu owner %llu offset %llu found %u wanted %u back %p\n", + (unsigned long long)rec->start, + back->full_backref ? + "parent" : "root", + back->full_backref ? + (unsigned long long)dback->parent : + (unsigned long long)dback->root, + (unsigned long long)dback->owner, + (unsigned long long)dback->offset, + dback->found_ref, dback->num_refs, + back); + } + if (dback->disk_bytenr != rec->start) { + err = 1; + if (!print_errs) + goto out; + fprintf(stderr, +"backref disk bytenr does not match extent record, bytenr=%llu, ref bytenr=%llu\n", + (unsigned long long)rec->start, + (unsigned long long)dback->disk_bytenr); + } + + if (dback->bytes != rec->nr) { + err = 1; + if (!print_errs) + goto out; + fprintf(stderr, +"backref bytes do not match extent backref, bytenr=%llu, ref bytes=%llu, backref bytes=%llu\n", + (unsigned long long)rec->start, + (unsigned long long)rec->nr, + (unsigned long long)dback->bytes); + } + } + if (!back->is_data) { + found += 1; + } else { + dback = to_data_backref(back); + found += dback->found_ref; + } + } + if (found != rec->refs) { + err = 1; + if (!print_errs) + goto out; + fprintf(stderr, + "incorrect global backref count on %llu found %llu wanted %llu\n", + (unsigned long long)rec->start, + (unsigned long long)found, + (unsigned long long)rec->refs); + } +out: + return err; +} + +static void __free_one_backref(struct rb_node *node) +{ + struct extent_backref *back = rb_node_to_extent_backref(node); + + free(back); +} + +static void free_all_extent_backrefs(struct extent_record *rec) +{ + rb_free_nodes(&rec->backref_tree, __free_one_backref); +} + +static void free_extent_record_cache(struct cache_tree *extent_cache) +{ + struct cache_extent *cache; + struct extent_record *rec; + + while (1) { + cache = first_cache_extent(extent_cache); + if (!cache) + break; + rec = container_of(cache, struct extent_record, cache); + remove_cache_extent(extent_cache, cache); + free_all_extent_backrefs(rec); + free(rec); + } +} + +static int maybe_free_extent_rec(struct cache_tree *extent_cache, + struct extent_record *rec) +{ + if (rec->content_checked && rec->owner_ref_checked && + rec->extent_item_refs == rec->refs && rec->refs > 0 && + rec->num_duplicates == 0 && !all_backpointers_checked(rec, 0) && + !rec->bad_full_backref && !rec->crossing_stripes && + !rec->wrong_chunk_type) { + remove_cache_extent(extent_cache, &rec->cache); + free_all_extent_backrefs(rec); + list_del_init(&rec->list); + free(rec); + } + return 0; +} + +static int check_owner_ref(struct btrfs_root *root, + struct extent_record *rec, + struct extent_buffer *buf) +{ + struct extent_backref *node, *tmp; + struct tree_backref *back; + struct btrfs_root *ref_root; + struct btrfs_key key; + struct btrfs_path path; + struct extent_buffer *parent; + int level; + int found = 0; + int ret; + + rbtree_postorder_for_each_entry_safe(node, tmp, + &rec->backref_tree, node) { + if (node->is_data) + continue; + if (!node->found_ref) + continue; + if (node->full_backref) + continue; + back = to_tree_backref(node); + if (btrfs_header_owner(buf) == back->root) + return 0; + } + BUG_ON(rec->is_root); + + /* try to find the block by search corresponding fs tree */ + key.objectid = btrfs_header_owner(buf); + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + + ref_root = btrfs_read_fs_root(root->fs_info, &key); + if (IS_ERR(ref_root)) + return 1; + + level = btrfs_header_level(buf); + if (level == 0) + btrfs_item_key_to_cpu(buf, &key, 0); + else + btrfs_node_key_to_cpu(buf, &key, 0); + + btrfs_init_path(&path); + path.lowest_level = level + 1; + ret = btrfs_search_slot(NULL, ref_root, &key, &path, 0, 0); + if (ret < 0) + return 0; + + parent = path.nodes[level + 1]; + if (parent && buf->start == btrfs_node_blockptr(parent, + path.slots[level + 1])) + found = 1; + + btrfs_release_path(&path); + return found ? 0 : 1; +} + +static int is_extent_tree_record(struct extent_record *rec) +{ + struct extent_backref *node, *tmp; + struct tree_backref *back; + int is_extent = 0; + + rbtree_postorder_for_each_entry_safe(node, tmp, + &rec->backref_tree, node) { + if (node->is_data) + return 0; + back = to_tree_backref(node); + if (node->full_backref) + return 0; + if (back->root == BTRFS_EXTENT_TREE_OBJECTID) + is_extent = 1; + } + return is_extent; +} + + +static int record_bad_block_io(struct btrfs_fs_info *info, + struct cache_tree *extent_cache, + u64 start, u64 len) +{ + struct extent_record *rec; + struct cache_extent *cache; + struct btrfs_key key; + + cache = lookup_cache_extent(extent_cache, start, len); + if (!cache) + return 0; + + rec = container_of(cache, struct extent_record, cache); + if (!is_extent_tree_record(rec)) + return 0; + + btrfs_disk_key_to_cpu(&key, &rec->parent_key); + return btrfs_add_corrupt_extent_record(info, &key, start, len, 0); +} + +static int swap_values(struct btrfs_root *root, struct btrfs_path *path, + struct extent_buffer *buf, int slot) +{ + if (btrfs_header_level(buf)) { + struct btrfs_key_ptr ptr1, ptr2; + + read_extent_buffer(buf, &ptr1, btrfs_node_key_ptr_offset(slot), + sizeof(struct btrfs_key_ptr)); + read_extent_buffer(buf, &ptr2, + btrfs_node_key_ptr_offset(slot + 1), + sizeof(struct btrfs_key_ptr)); + write_extent_buffer(buf, &ptr1, + btrfs_node_key_ptr_offset(slot + 1), + sizeof(struct btrfs_key_ptr)); + write_extent_buffer(buf, &ptr2, + btrfs_node_key_ptr_offset(slot), + sizeof(struct btrfs_key_ptr)); + if (slot == 0) { + struct btrfs_disk_key key; + + btrfs_node_key(buf, &key, 0); + btrfs_fixup_low_keys(root, path, &key, + btrfs_header_level(buf) + 1); + } + } else { + struct btrfs_item *item1, *item2; + struct btrfs_key k1, k2; + char *item1_data, *item2_data; + u32 item1_offset, item2_offset, item1_size, item2_size; + + item1 = btrfs_item_nr(slot); + item2 = btrfs_item_nr(slot + 1); + btrfs_item_key_to_cpu(buf, &k1, slot); + btrfs_item_key_to_cpu(buf, &k2, slot + 1); + item1_offset = btrfs_item_offset(buf, item1); + item2_offset = btrfs_item_offset(buf, item2); + item1_size = btrfs_item_size(buf, item1); + item2_size = btrfs_item_size(buf, item2); + + item1_data = malloc(item1_size); + if (!item1_data) + return -ENOMEM; + item2_data = malloc(item2_size); + if (!item2_data) { + free(item1_data); + return -ENOMEM; + } + + read_extent_buffer(buf, item1_data, item1_offset, item1_size); + read_extent_buffer(buf, item2_data, item2_offset, item2_size); + + write_extent_buffer(buf, item1_data, item2_offset, item2_size); + write_extent_buffer(buf, item2_data, item1_offset, item1_size); + free(item1_data); + free(item2_data); + + btrfs_set_item_offset(buf, item1, item2_offset); + btrfs_set_item_offset(buf, item2, item1_offset); + btrfs_set_item_size(buf, item1, item2_size); + btrfs_set_item_size(buf, item2, item1_size); + + path->slots[0] = slot; + btrfs_set_item_key_unsafe(root, path, &k2); + path->slots[0] = slot + 1; + btrfs_set_item_key_unsafe(root, path, &k1); + } + return 0; +} + +static int fix_key_order(struct btrfs_root *root, struct btrfs_path *path) +{ + struct extent_buffer *buf; + struct btrfs_key k1, k2; + int i; + int level = path->lowest_level; + int ret = -EIO; + + buf = path->nodes[level]; + for (i = 0; i < btrfs_header_nritems(buf) - 1; i++) { + if (level) { + btrfs_node_key_to_cpu(buf, &k1, i); + btrfs_node_key_to_cpu(buf, &k2, i + 1); + } else { + btrfs_item_key_to_cpu(buf, &k1, i); + btrfs_item_key_to_cpu(buf, &k2, i + 1); + } + if (btrfs_comp_cpu_keys(&k1, &k2) < 0) + continue; + ret = swap_values(root, path, buf, i); + if (ret) + break; + btrfs_mark_buffer_dirty(buf); + i = 0; + } + return ret; +} + +static int delete_bogus_item(struct btrfs_root *root, + struct btrfs_path *path, + struct extent_buffer *buf, int slot) +{ + struct btrfs_key key; + int nritems = btrfs_header_nritems(buf); + + btrfs_item_key_to_cpu(buf, &key, slot); + + /* These are all the keys we can deal with missing. */ + if (key.type != BTRFS_DIR_INDEX_KEY && + key.type != BTRFS_EXTENT_ITEM_KEY && + key.type != BTRFS_METADATA_ITEM_KEY && + key.type != BTRFS_TREE_BLOCK_REF_KEY && + key.type != BTRFS_EXTENT_DATA_REF_KEY) + return -1; + + printf("Deleting bogus item [%llu,%u,%llu] at slot %d on block %llu\n", + (unsigned long long)key.objectid, key.type, + (unsigned long long)key.offset, slot, buf->start); + memmove_extent_buffer(buf, btrfs_item_nr_offset(slot), + btrfs_item_nr_offset(slot + 1), + sizeof(struct btrfs_item) * + (nritems - slot - 1)); + btrfs_set_header_nritems(buf, nritems - 1); + if (slot == 0) { + struct btrfs_disk_key disk_key; + + btrfs_item_key(buf, &disk_key, 0); + btrfs_fixup_low_keys(root, path, &disk_key, 1); + } + btrfs_mark_buffer_dirty(buf); + return 0; +} + +static int fix_item_offset(struct btrfs_root *root, struct btrfs_path *path) +{ + struct extent_buffer *buf; + int i; + int ret = 0; + + /* We should only get this for leaves */ + BUG_ON(path->lowest_level); + buf = path->nodes[0]; +again: + for (i = 0; i < btrfs_header_nritems(buf); i++) { + unsigned int shift = 0, offset; + + if (i == 0 && btrfs_item_end_nr(buf, i) != + BTRFS_LEAF_DATA_SIZE(root->fs_info)) { + if (btrfs_item_end_nr(buf, i) > + BTRFS_LEAF_DATA_SIZE(root->fs_info)) { + ret = delete_bogus_item(root, path, buf, i); + if (!ret) + goto again; + fprintf(stderr, + "item is off the end of the leaf, can't fix\n"); + ret = -EIO; + break; + } + shift = BTRFS_LEAF_DATA_SIZE(root->fs_info) - + btrfs_item_end_nr(buf, i); + } else if (i > 0 && btrfs_item_end_nr(buf, i) != + btrfs_item_offset_nr(buf, i - 1)) { + if (btrfs_item_end_nr(buf, i) > + btrfs_item_offset_nr(buf, i - 1)) { + ret = delete_bogus_item(root, path, buf, i); + if (!ret) + goto again; + fprintf(stderr, "items overlap, can't fix\n"); + ret = -EIO; + break; + } + shift = btrfs_item_offset_nr(buf, i - 1) - + btrfs_item_end_nr(buf, i); + } + if (!shift) + continue; + + printf("Shifting item nr %d by %u bytes in block %llu\n", + i, shift, (unsigned long long)buf->start); + offset = btrfs_item_offset_nr(buf, i); + memmove_extent_buffer(buf, + btrfs_leaf_data(buf) + offset + shift, + btrfs_leaf_data(buf) + offset, + btrfs_item_size_nr(buf, i)); + btrfs_set_item_offset(buf, btrfs_item_nr(i), + offset + shift); + btrfs_mark_buffer_dirty(buf); + } + + /* + * We may have moved things, in which case we want to exit so we don't + * write those changes out. Once we have proper abort functionality in + * progs this can be changed to something nicer. + */ + BUG_ON(ret); + return ret; +} + +/* + * Attempt to fix basic block failures. If we can't fix it for whatever reason + * then just return -EIO. + */ +static int try_to_fix_bad_block(struct btrfs_root *root, + struct extent_buffer *buf, + enum btrfs_tree_block_status status) +{ + struct btrfs_trans_handle *trans; + struct ulist *roots; + struct ulist_node *node; + struct btrfs_root *search_root; + struct btrfs_path path; + struct ulist_iterator iter; + struct btrfs_key root_key, key; + int ret; + + if (status != BTRFS_TREE_BLOCK_BAD_KEY_ORDER && + status != BTRFS_TREE_BLOCK_INVALID_OFFSETS) + return -EIO; + + ret = btrfs_find_all_roots(NULL, root->fs_info, buf->start, 0, &roots); + if (ret) + return -EIO; + + btrfs_init_path(&path); + ULIST_ITER_INIT(&iter); + while ((node = ulist_next(roots, &iter))) { + root_key.objectid = node->val; + root_key.type = BTRFS_ROOT_ITEM_KEY; + root_key.offset = (u64)-1; + + search_root = btrfs_read_fs_root(root->fs_info, &root_key); + if (IS_ERR(root)) { + ret = -EIO; + break; + } + + + trans = btrfs_start_transaction(search_root, 0); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + break; + } + + path.lowest_level = btrfs_header_level(buf); + path.skip_check_block = 1; + if (path.lowest_level) + btrfs_node_key_to_cpu(buf, &key, 0); + else + btrfs_item_key_to_cpu(buf, &key, 0); + ret = btrfs_search_slot(trans, search_root, &key, &path, 0, 1); + if (ret) { + ret = -EIO; + btrfs_commit_transaction(trans, search_root); + break; + } + if (status == BTRFS_TREE_BLOCK_BAD_KEY_ORDER) + ret = fix_key_order(search_root, &path); + else if (status == BTRFS_TREE_BLOCK_INVALID_OFFSETS) + ret = fix_item_offset(search_root, &path); + if (ret) { + btrfs_commit_transaction(trans, search_root); + break; + } + btrfs_release_path(&path); + btrfs_commit_transaction(trans, search_root); + } + ulist_free(roots); + btrfs_release_path(&path); + return ret; +} + +static int check_block(struct btrfs_root *root, + struct cache_tree *extent_cache, + struct extent_buffer *buf, u64 flags) +{ + struct extent_record *rec; + struct cache_extent *cache; + struct btrfs_key key; + enum btrfs_tree_block_status status; + int ret = 0; + int level; + + cache = lookup_cache_extent(extent_cache, buf->start, buf->len); + if (!cache) + return 1; + rec = container_of(cache, struct extent_record, cache); + rec->generation = btrfs_header_generation(buf); + + level = btrfs_header_level(buf); + if (btrfs_header_nritems(buf) > 0) { + + if (level == 0) + btrfs_item_key_to_cpu(buf, &key, 0); + else + btrfs_node_key_to_cpu(buf, &key, 0); + + rec->info_objectid = key.objectid; + } + rec->info_level = level; + + if (btrfs_is_leaf(buf)) + status = btrfs_check_leaf(root, &rec->parent_key, buf); + else + status = btrfs_check_node(root, &rec->parent_key, buf); + + if (status != BTRFS_TREE_BLOCK_CLEAN) { + if (repair) + status = try_to_fix_bad_block(root, buf, status); + if (status != BTRFS_TREE_BLOCK_CLEAN) { + ret = -EIO; + fprintf(stderr, "bad block %llu\n", + (unsigned long long)buf->start); + } else { + /* + * Signal to callers we need to start the scan over + * again since we'll have cowed blocks. + */ + ret = -EAGAIN; + } + } else { + rec->content_checked = 1; + if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) + rec->owner_ref_checked = 1; + else { + ret = check_owner_ref(root, rec, buf); + if (!ret) + rec->owner_ref_checked = 1; + } + } + if (!ret) + maybe_free_extent_rec(extent_cache, rec); + return ret; +} + +#if 0 +static struct tree_backref *find_tree_backref(struct extent_record *rec, + u64 parent, u64 root) +{ + struct list_head *cur = rec->backrefs.next; + struct extent_backref *node; + struct tree_backref *back; + + while (cur != &rec->backrefs) { + node = to_extent_backref(cur); + cur = cur->next; + if (node->is_data) + continue; + back = to_tree_backref(node); + if (parent > 0) { + if (!node->full_backref) + continue; + if (parent == back->parent) + return back; + } else { + if (node->full_backref) + continue; + if (back->root == root) + return back; + } + } + return NULL; +} +#endif + +static struct tree_backref *alloc_tree_backref(struct extent_record *rec, + u64 parent, u64 root) +{ + struct tree_backref *ref = malloc(sizeof(*ref)); + + if (!ref) + return NULL; + memset(&ref->node, 0, sizeof(ref->node)); + if (parent > 0) { + ref->parent = parent; + ref->node.full_backref = 1; + } else { + ref->root = root; + ref->node.full_backref = 0; + } + + return ref; +} + +#if 0 +static struct data_backref *find_data_backref(struct extent_record *rec, + u64 parent, u64 root, + u64 owner, u64 offset, + int found_ref, + u64 disk_bytenr, u64 bytes) +{ + struct list_head *cur = rec->backrefs.next; + struct extent_backref *node; + struct data_backref *back; + + while (cur != &rec->backrefs) { + node = to_extent_backref(cur); + cur = cur->next; + if (!node->is_data) + continue; + back = to_data_backref(node); + if (parent > 0) { + if (!node->full_backref) + continue; + if (parent == back->parent) + return back; + } else { + if (node->full_backref) + continue; + if (back->root == root && back->owner == owner && + back->offset == offset) { + if (found_ref && node->found_ref && + (back->bytes != bytes || + back->disk_bytenr != disk_bytenr)) + continue; + return back; + } + } + } + return NULL; +} +#endif + +static struct data_backref *alloc_data_backref(struct extent_record *rec, + u64 parent, u64 root, + u64 owner, u64 offset, + u64 max_size) +{ + struct data_backref *ref = malloc(sizeof(*ref)); + + if (!ref) + return NULL; + memset(&ref->node, 0, sizeof(ref->node)); + ref->node.is_data = 1; + + if (parent > 0) { + ref->parent = parent; + ref->owner = 0; + ref->offset = 0; + ref->node.full_backref = 1; + } else { + ref->root = root; + ref->owner = owner; + ref->offset = offset; + ref->node.full_backref = 0; + } + ref->bytes = max_size; + ref->found_ref = 0; + ref->num_refs = 0; + if (max_size > rec->max_size) + rec->max_size = max_size; + return ref; +} + +/* Check if the type of extent matches with its chunk */ +static void check_extent_type(struct extent_record *rec) +{ + struct btrfs_block_group_cache *bg_cache; + + bg_cache = btrfs_lookup_first_block_group(global_info, rec->start); + if (!bg_cache) + return; + + /* data extent, check chunk directly*/ + if (!rec->metadata) { + if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_DATA)) + rec->wrong_chunk_type = 1; + return; + } + + /* metadata extent, check the obvious case first */ + if (!(bg_cache->flags & (BTRFS_BLOCK_GROUP_SYSTEM | + BTRFS_BLOCK_GROUP_METADATA))) { + rec->wrong_chunk_type = 1; + return; + } + + /* + * Check SYSTEM extent, as it's also marked as metadata, we can only + * make sure it's a SYSTEM extent by its backref + */ + if (!RB_EMPTY_ROOT(&rec->backref_tree)) { + struct extent_backref *node; + struct tree_backref *tback; + u64 bg_type; + + node = rb_node_to_extent_backref(rb_first(&rec->backref_tree)); + if (node->is_data) { + /* tree block shouldn't have data backref */ + rec->wrong_chunk_type = 1; + return; + } + tback = container_of(node, struct tree_backref, node); + + if (tback->root == BTRFS_CHUNK_TREE_OBJECTID) + bg_type = BTRFS_BLOCK_GROUP_SYSTEM; + else + bg_type = BTRFS_BLOCK_GROUP_METADATA; + if (!(bg_cache->flags & bg_type)) + rec->wrong_chunk_type = 1; + } +} + +/* + * Allocate a new extent record, fill default values from @tmpl and insert int + * @extent_cache. Caller is supposed to make sure the [start,nr) is not in + * the cache, otherwise it fails. + */ +static int add_extent_rec_nolookup(struct cache_tree *extent_cache, + struct extent_record *tmpl) +{ + struct extent_record *rec; + int ret = 0; + + BUG_ON(tmpl->max_size == 0); + rec = malloc(sizeof(*rec)); + if (!rec) + return -ENOMEM; + rec->start = tmpl->start; + rec->max_size = tmpl->max_size; + rec->nr = max(tmpl->nr, tmpl->max_size); + rec->found_rec = tmpl->found_rec; + rec->content_checked = tmpl->content_checked; + rec->owner_ref_checked = tmpl->owner_ref_checked; + rec->num_duplicates = 0; + rec->metadata = tmpl->metadata; + rec->flag_block_full_backref = FLAG_UNSET; + rec->bad_full_backref = 0; + rec->crossing_stripes = 0; + rec->wrong_chunk_type = 0; + rec->is_root = tmpl->is_root; + rec->refs = tmpl->refs; + rec->extent_item_refs = tmpl->extent_item_refs; + rec->parent_generation = tmpl->parent_generation; + INIT_LIST_HEAD(&rec->backrefs); + INIT_LIST_HEAD(&rec->dups); + INIT_LIST_HEAD(&rec->list); + rec->backref_tree = RB_ROOT; + memcpy(&rec->parent_key, &tmpl->parent_key, sizeof(tmpl->parent_key)); + rec->cache.start = tmpl->start; + rec->cache.size = tmpl->nr; + ret = insert_cache_extent(extent_cache, &rec->cache); + if (ret) { + free(rec); + return ret; + } + bytes_used += rec->nr; + + if (tmpl->metadata) + rec->crossing_stripes = check_crossing_stripes(global_info, + rec->start, global_info->nodesize); + check_extent_type(rec); + return ret; +} + +/* + * Lookup and modify an extent, some values of @tmpl are interpreted verbatim, + * some are hints: + * - refs - if found, increase refs + * - is_root - if found, set + * - content_checked - if found, set + * - owner_ref_checked - if found, set + * + * If not found, create a new one, initialize and insert. + */ +static int add_extent_rec(struct cache_tree *extent_cache, + struct extent_record *tmpl) +{ + struct extent_record *rec; + struct cache_extent *cache; + int ret = 0; + int dup = 0; + + cache = lookup_cache_extent(extent_cache, tmpl->start, tmpl->nr); + if (cache) { + rec = container_of(cache, struct extent_record, cache); + if (tmpl->refs) + rec->refs++; + if (rec->nr == 1) + rec->nr = max(tmpl->nr, tmpl->max_size); + + /* + * We need to make sure to reset nr to whatever the extent + * record says was the real size, this way we can compare it to + * the backrefs. + */ + if (tmpl->found_rec) { + if (tmpl->start != rec->start || rec->found_rec) { + struct extent_record *tmp; + + dup = 1; + if (list_empty(&rec->list)) + list_add_tail(&rec->list, + &duplicate_extents); + + /* + * We have to do this song and dance in case we + * find an extent record that falls inside of + * our current extent record but does not have + * the same objectid. + */ + tmp = malloc(sizeof(*tmp)); + if (!tmp) + return -ENOMEM; + tmp->start = tmpl->start; + tmp->max_size = tmpl->max_size; + tmp->nr = tmpl->nr; + tmp->found_rec = 1; + tmp->metadata = tmpl->metadata; + tmp->extent_item_refs = tmpl->extent_item_refs; + INIT_LIST_HEAD(&tmp->list); + list_add_tail(&tmp->list, &rec->dups); + rec->num_duplicates++; + } else { + rec->nr = tmpl->nr; + rec->found_rec = 1; + } + } + + if (tmpl->extent_item_refs && !dup) { + if (rec->extent_item_refs) { + fprintf(stderr, + "block %llu rec extent_item_refs %llu, passed %llu\n", + (unsigned long long)tmpl->start, + (unsigned long long) + rec->extent_item_refs, + (unsigned long long) + tmpl->extent_item_refs); + } + rec->extent_item_refs = tmpl->extent_item_refs; + } + if (tmpl->is_root) + rec->is_root = 1; + if (tmpl->content_checked) + rec->content_checked = 1; + if (tmpl->owner_ref_checked) + rec->owner_ref_checked = 1; + memcpy(&rec->parent_key, &tmpl->parent_key, + sizeof(tmpl->parent_key)); + if (tmpl->parent_generation) + rec->parent_generation = tmpl->parent_generation; + if (rec->max_size < tmpl->max_size) + rec->max_size = tmpl->max_size; + + /* + * A metadata extent can't cross stripe_len boundary, otherwise + * kernel scrub won't be able to handle it. + * As now stripe_len is fixed to BTRFS_STRIPE_LEN, just check + * it. + */ + if (tmpl->metadata) + rec->crossing_stripes = check_crossing_stripes( + global_info, rec->start, + global_info->nodesize); + check_extent_type(rec); + maybe_free_extent_rec(extent_cache, rec); + return ret; + } + + ret = add_extent_rec_nolookup(extent_cache, tmpl); + + return ret; +} + +static int add_tree_backref(struct cache_tree *extent_cache, u64 bytenr, + u64 parent, u64 root, int found_ref) +{ + struct extent_record *rec; + struct tree_backref *back; + struct cache_extent *cache; + int ret; + bool insert = false; + + cache = lookup_cache_extent(extent_cache, bytenr, 1); + if (!cache) { + struct extent_record tmpl; + + memset(&tmpl, 0, sizeof(tmpl)); + tmpl.start = bytenr; + tmpl.nr = 1; + tmpl.metadata = 1; + tmpl.max_size = 1; + + ret = add_extent_rec_nolookup(extent_cache, &tmpl); + if (ret) + return ret; + + /* really a bug in cache_extent implement now */ + cache = lookup_cache_extent(extent_cache, bytenr, 1); + if (!cache) + return -ENOENT; + } + + rec = container_of(cache, struct extent_record, cache); + if (rec->start != bytenr) { + /* + * Several cause, from unaligned bytenr to over lapping extents + */ + return -EEXIST; + } + + back = find_tree_backref(rec, parent, root); + if (!back) { + back = alloc_tree_backref(rec, parent, root); + if (!back) + return -ENOMEM; + insert = true; + } + + if (found_ref) { + if (back->node.found_ref) { + fprintf(stderr, + "Extent back ref already exists for %llu parent %llu root %llu\n", + (unsigned long long)bytenr, + (unsigned long long)parent, + (unsigned long long)root); + } + back->node.found_ref = 1; + } else { + if (back->node.found_extent_tree) { + fprintf(stderr, + "extent back ref already exists for %llu parent %llu root %llu\n", + (unsigned long long)bytenr, + (unsigned long long)parent, + (unsigned long long)root); + } + back->node.found_extent_tree = 1; + } + if (insert) + WARN_ON(rb_insert(&rec->backref_tree, &back->node.node, + compare_extent_backref)); + check_extent_type(rec); + maybe_free_extent_rec(extent_cache, rec); + return 0; +} + +static int add_data_backref(struct cache_tree *extent_cache, u64 bytenr, + u64 parent, u64 root, u64 owner, u64 offset, + u32 num_refs, int found_ref, u64 max_size) +{ + struct extent_record *rec; + struct data_backref *back; + struct cache_extent *cache; + int ret; + bool insert = false; + + cache = lookup_cache_extent(extent_cache, bytenr, 1); + if (!cache) { + struct extent_record tmpl; + + memset(&tmpl, 0, sizeof(tmpl)); + tmpl.start = bytenr; + tmpl.nr = 1; + tmpl.max_size = max_size; + + ret = add_extent_rec_nolookup(extent_cache, &tmpl); + if (ret) + return ret; + + cache = lookup_cache_extent(extent_cache, bytenr, 1); + if (!cache) + abort(); + } + + rec = container_of(cache, struct extent_record, cache); + if (rec->max_size < max_size) + rec->max_size = max_size; + + /* + * If found_ref is set then max_size is the real size and must match the + * existing refs. So if we have already found a ref then we need to + * make sure that this ref matches the existing one, otherwise we need + * to add a new backref so we can notice that the backrefs don't match + * and we need to figure out who is telling the truth. This is to + * account for that awful fsync bug I introduced where we'd end up with + * a btrfs_file_extent_item that would have its length include multiple + * prealloc extents or point inside of a prealloc extent. + */ + back = find_data_backref(rec, parent, root, owner, offset, found_ref, + bytenr, max_size); + if (!back) { + back = alloc_data_backref(rec, parent, root, owner, offset, + max_size); + BUG_ON(!back); + insert = true; + } + + if (found_ref) { + BUG_ON(num_refs != 1); + if (back->node.found_ref) + BUG_ON(back->bytes != max_size); + back->node.found_ref = 1; + back->found_ref += 1; + if (back->bytes != max_size || back->disk_bytenr != bytenr) { + back->bytes = max_size; + back->disk_bytenr = bytenr; + + /* Need to reinsert if not already in the tree */ + if (!insert) { + rb_erase(&back->node.node, &rec->backref_tree); + insert = true; + } + } + rec->refs += 1; + rec->content_checked = 1; + rec->owner_ref_checked = 1; + } else { + if (back->node.found_extent_tree) { + fprintf(stderr, +"Extent back ref already exists for %llu parent %llu root %llu owner %llu offset %llu num_refs %lu\n", + (unsigned long long)bytenr, + (unsigned long long)parent, + (unsigned long long)root, + (unsigned long long)owner, + (unsigned long long)offset, + (unsigned long)num_refs); + } + back->num_refs = num_refs; + back->node.found_extent_tree = 1; + } + if (insert) + WARN_ON(rb_insert(&rec->backref_tree, &back->node.node, + compare_extent_backref)); + + maybe_free_extent_rec(extent_cache, rec); + return 0; +} + +static int add_pending(struct cache_tree *pending, + struct cache_tree *seen, u64 bytenr, u32 size) +{ + int ret; + + ret = add_cache_extent(seen, bytenr, size); + if (ret) + return ret; + add_cache_extent(pending, bytenr, size); + return 0; +} + +static int pick_next_pending(struct cache_tree *pending, + struct cache_tree *reada, + struct cache_tree *nodes, + u64 last, struct block_info *bits, int bits_nr, + int *reada_bits) +{ + unsigned long node_start = last; + struct cache_extent *cache; + int ret; + + cache = search_cache_extent(reada, 0); + if (cache) { + bits[0].start = cache->start; + bits[0].size = cache->size; + *reada_bits = 1; + return 1; + } + *reada_bits = 0; + if (node_start > 32768) + node_start -= 32768; + + cache = search_cache_extent(nodes, node_start); + if (!cache) + cache = search_cache_extent(nodes, 0); + + if (!cache) { + cache = search_cache_extent(pending, 0); + if (!cache) + return 0; + ret = 0; + do { + bits[ret].start = cache->start; + bits[ret].size = cache->size; + cache = next_cache_extent(cache); + ret++; + } while (cache && ret < bits_nr); + return ret; + } + + ret = 0; + do { + bits[ret].start = cache->start; + bits[ret].size = cache->size; + cache = next_cache_extent(cache); + ret++; + } while (cache && ret < bits_nr); + + if (bits_nr - ret > 8) { + u64 lookup = bits[0].start + bits[0].size; + struct cache_extent *next; + + next = search_cache_extent(pending, lookup); + while (next) { + if (next->start - lookup > 32768) + break; + bits[ret].start = next->start; + bits[ret].size = next->size; + lookup = next->start + next->size; + ret++; + if (ret == bits_nr) + break; + next = next_cache_extent(next); + if (!next) + break; + } + } + return ret; +} + +static void free_chunk_record(struct cache_extent *cache) +{ + struct chunk_record *rec; + + rec = container_of(cache, struct chunk_record, cache); + list_del_init(&rec->list); + list_del_init(&rec->dextents); + free(rec); +} + +void free_chunk_cache_tree(struct cache_tree *chunk_cache) +{ + cache_tree_free_extents(chunk_cache, free_chunk_record); +} + +static void free_device_record(struct rb_node *node) +{ + struct device_record *rec; + + rec = container_of(node, struct device_record, node); + free(rec); +} + +FREE_RB_BASED_TREE(device_cache, free_device_record); + +int insert_block_group_record(struct block_group_tree *tree, + struct block_group_record *bg_rec) +{ + int ret; + + ret = insert_cache_extent(&tree->tree, &bg_rec->cache); + if (ret) + return ret; + + list_add_tail(&bg_rec->list, &tree->block_groups); + return 0; +} + +static void free_block_group_record(struct cache_extent *cache) +{ + struct block_group_record *rec; + + rec = container_of(cache, struct block_group_record, cache); + list_del_init(&rec->list); + free(rec); +} + +void free_block_group_tree(struct block_group_tree *tree) +{ + cache_tree_free_extents(&tree->tree, free_block_group_record); +} + +int insert_device_extent_record(struct device_extent_tree *tree, + struct device_extent_record *de_rec) +{ + int ret; + + /* + * Device extent is a bit different from the other extents, because + * the extents which belong to the different devices may have the + * same start and size, so we need use the special extent cache + * search/insert functions. + */ + ret = insert_cache_extent2(&tree->tree, &de_rec->cache); + if (ret) + return ret; + + list_add_tail(&de_rec->chunk_list, &tree->no_chunk_orphans); + list_add_tail(&de_rec->device_list, &tree->no_device_orphans); + return 0; +} + +static void free_device_extent_record(struct cache_extent *cache) +{ + struct device_extent_record *rec; + + rec = container_of(cache, struct device_extent_record, cache); + if (!list_empty(&rec->chunk_list)) + list_del_init(&rec->chunk_list); + if (!list_empty(&rec->device_list)) + list_del_init(&rec->device_list); + free(rec); +} + +void free_device_extent_tree(struct device_extent_tree *tree) +{ + cache_tree_free_extents(&tree->tree, free_device_extent_record); +} + +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 +static int process_extent_ref_v0(struct cache_tree *extent_cache, + struct extent_buffer *leaf, int slot) +{ + struct btrfs_extent_ref_v0 *ref0; + struct btrfs_key key; + int ret; + + btrfs_item_key_to_cpu(leaf, &key, slot); + ref0 = btrfs_item_ptr(leaf, slot, struct btrfs_extent_ref_v0); + if (btrfs_ref_objectid_v0(leaf, ref0) < BTRFS_FIRST_FREE_OBJECTID) { + ret = add_tree_backref(extent_cache, key.objectid, key.offset, + 0, 0); + } else { + ret = add_data_backref(extent_cache, key.objectid, key.offset, + 0, 0, 0, btrfs_ref_count_v0(leaf, ref0), 0, 0); + } + return ret; +} +#endif + +struct chunk_record *btrfs_new_chunk_record(struct extent_buffer *leaf, + struct btrfs_key *key, + int slot) +{ + struct btrfs_chunk *ptr; + struct chunk_record *rec; + int num_stripes, i; + + ptr = btrfs_item_ptr(leaf, slot, struct btrfs_chunk); + num_stripes = btrfs_chunk_num_stripes(leaf, ptr); + + rec = calloc(1, btrfs_chunk_record_size(num_stripes)); + if (!rec) { + fprintf(stderr, "memory allocation failed\n"); + exit(-1); + } + + INIT_LIST_HEAD(&rec->list); + INIT_LIST_HEAD(&rec->dextents); + rec->bg_rec = NULL; + + rec->cache.start = key->offset; + rec->cache.size = btrfs_chunk_length(leaf, ptr); + + rec->generation = btrfs_header_generation(leaf); + + rec->objectid = key->objectid; + rec->type = key->type; + rec->offset = key->offset; + + rec->length = rec->cache.size; + rec->owner = btrfs_chunk_owner(leaf, ptr); + rec->stripe_len = btrfs_chunk_stripe_len(leaf, ptr); + rec->type_flags = btrfs_chunk_type(leaf, ptr); + rec->io_width = btrfs_chunk_io_width(leaf, ptr); + rec->io_align = btrfs_chunk_io_align(leaf, ptr); + rec->sector_size = btrfs_chunk_sector_size(leaf, ptr); + rec->num_stripes = num_stripes; + rec->sub_stripes = btrfs_chunk_sub_stripes(leaf, ptr); + + for (i = 0; i < rec->num_stripes; ++i) { + rec->stripes[i].devid = + btrfs_stripe_devid_nr(leaf, ptr, i); + rec->stripes[i].offset = + btrfs_stripe_offset_nr(leaf, ptr, i); + read_extent_buffer(leaf, rec->stripes[i].dev_uuid, + (unsigned long)btrfs_stripe_dev_uuid_nr(ptr, i), + BTRFS_UUID_SIZE); + } + + return rec; +} + +static int process_chunk_item(struct cache_tree *chunk_cache, + struct btrfs_key *key, struct extent_buffer *eb, + int slot) +{ + struct chunk_record *rec; + struct btrfs_chunk *chunk; + int ret = 0; + + chunk = btrfs_item_ptr(eb, slot, struct btrfs_chunk); + /* + * Do extra check for this chunk item, + * + * It's still possible one can craft a leaf with CHUNK_ITEM, with + * wrong onwer(3) out of chunk tree, to pass both chunk tree check + * and owner<->key_type check. + */ + ret = btrfs_check_chunk_valid(global_info, eb, chunk, slot, + key->offset); + if (ret < 0) { + error("chunk(%llu, %llu) is not valid, ignore it", + key->offset, btrfs_chunk_length(eb, chunk)); + return 0; + } + rec = btrfs_new_chunk_record(eb, key, slot); + ret = insert_cache_extent(chunk_cache, &rec->cache); + if (ret) { + fprintf(stderr, "Chunk[%llu, %llu] existed.\n", + rec->offset, rec->length); + free(rec); + } + + return ret; +} + +static int process_device_item(struct rb_root *dev_cache, + struct btrfs_key *key, struct extent_buffer *eb, int slot) +{ + struct btrfs_dev_item *ptr; + struct device_record *rec; + int ret = 0; + + ptr = btrfs_item_ptr(eb, + slot, struct btrfs_dev_item); + + rec = malloc(sizeof(*rec)); + if (!rec) { + fprintf(stderr, "memory allocation failed\n"); + return -ENOMEM; + } + + rec->devid = key->offset; + rec->generation = btrfs_header_generation(eb); + + rec->objectid = key->objectid; + rec->type = key->type; + rec->offset = key->offset; + + rec->devid = btrfs_device_id(eb, ptr); + rec->total_byte = btrfs_device_total_bytes(eb, ptr); + rec->byte_used = btrfs_device_bytes_used(eb, ptr); + + ret = rb_insert(dev_cache, &rec->node, device_record_compare); + if (ret) { + fprintf(stderr, "Device[%llu] existed.\n", rec->devid); + free(rec); + } + + return ret; +} + +struct block_group_record * +btrfs_new_block_group_record(struct extent_buffer *leaf, struct btrfs_key *key, + int slot) +{ + struct btrfs_block_group_item *ptr; + struct block_group_record *rec; + + rec = calloc(1, sizeof(*rec)); + if (!rec) { + fprintf(stderr, "memory allocation failed\n"); + exit(-1); + } + + rec->cache.start = key->objectid; + rec->cache.size = key->offset; + + rec->generation = btrfs_header_generation(leaf); + + rec->objectid = key->objectid; + rec->type = key->type; + rec->offset = key->offset; + + ptr = btrfs_item_ptr(leaf, slot, struct btrfs_block_group_item); + rec->flags = btrfs_disk_block_group_flags(leaf, ptr); + + INIT_LIST_HEAD(&rec->list); + + return rec; +} + +static int process_block_group_item(struct block_group_tree *block_group_cache, + struct btrfs_key *key, + struct extent_buffer *eb, int slot) +{ + struct block_group_record *rec; + int ret = 0; + + rec = btrfs_new_block_group_record(eb, key, slot); + ret = insert_block_group_record(block_group_cache, rec); + if (ret) { + fprintf(stderr, "Block Group[%llu, %llu] existed.\n", + rec->objectid, rec->offset); + free(rec); + } + + return ret; +} + +struct device_extent_record * +btrfs_new_device_extent_record(struct extent_buffer *leaf, + struct btrfs_key *key, int slot) +{ + struct device_extent_record *rec; + struct btrfs_dev_extent *ptr; + + rec = calloc(1, sizeof(*rec)); + if (!rec) { + fprintf(stderr, "memory allocation failed\n"); + exit(-1); + } + + rec->cache.objectid = key->objectid; + rec->cache.start = key->offset; + + rec->generation = btrfs_header_generation(leaf); + + rec->objectid = key->objectid; + rec->type = key->type; + rec->offset = key->offset; + + ptr = btrfs_item_ptr(leaf, slot, struct btrfs_dev_extent); + rec->chunk_objecteid = + btrfs_dev_extent_chunk_objectid(leaf, ptr); + rec->chunk_offset = + btrfs_dev_extent_chunk_offset(leaf, ptr); + rec->length = btrfs_dev_extent_length(leaf, ptr); + rec->cache.size = rec->length; + + INIT_LIST_HEAD(&rec->chunk_list); + INIT_LIST_HEAD(&rec->device_list); + + return rec; +} + +static int +process_device_extent_item(struct device_extent_tree *dev_extent_cache, + struct btrfs_key *key, struct extent_buffer *eb, + int slot) +{ + struct device_extent_record *rec; + int ret; + + rec = btrfs_new_device_extent_record(eb, key, slot); + ret = insert_device_extent_record(dev_extent_cache, rec); + if (ret) { + fprintf(stderr, + "Device extent[%llu, %llu, %llu] existed.\n", + rec->objectid, rec->offset, rec->length); + free(rec); + } + + return ret; +} + +static int process_extent_item(struct btrfs_root *root, + struct cache_tree *extent_cache, + struct extent_buffer *eb, int slot) +{ + struct btrfs_extent_item *ei; + struct btrfs_extent_inline_ref *iref; + struct btrfs_extent_data_ref *dref; + struct btrfs_shared_data_ref *sref; + struct btrfs_key key; + struct extent_record tmpl; + unsigned long end; + unsigned long ptr; + int ret; + int type; + u32 item_size = btrfs_item_size_nr(eb, slot); + u64 refs = 0; + u64 offset; + u64 num_bytes; + int metadata = 0; + + btrfs_item_key_to_cpu(eb, &key, slot); + + if (key.type == BTRFS_METADATA_ITEM_KEY) { + metadata = 1; + num_bytes = root->fs_info->nodesize; + } else { + num_bytes = key.offset; + } + + if (!IS_ALIGNED(key.objectid, root->fs_info->sectorsize)) { + error("ignoring invalid extent, bytenr %llu is not aligned to %u", + key.objectid, root->fs_info->sectorsize); + return -EIO; + } + if (item_size < sizeof(*ei)) { +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 + struct btrfs_extent_item_v0 *ei0; + + if (item_size != sizeof(*ei0)) { + error( + "invalid extent item format: ITEM[%llu %u %llu] leaf: %llu slot: %d", + key.objectid, key.type, key.offset, + btrfs_header_bytenr(eb), slot); + BUG(); + } + ei0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_item_v0); + refs = btrfs_extent_refs_v0(eb, ei0); +#else + BUG(); +#endif + memset(&tmpl, 0, sizeof(tmpl)); + tmpl.start = key.objectid; + tmpl.nr = num_bytes; + tmpl.extent_item_refs = refs; + tmpl.metadata = metadata; + tmpl.found_rec = 1; + tmpl.max_size = num_bytes; + + return add_extent_rec(extent_cache, &tmpl); + } + + ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item); + refs = btrfs_extent_refs(eb, ei); + if (btrfs_extent_flags(eb, ei) & BTRFS_EXTENT_FLAG_TREE_BLOCK) + metadata = 1; + else + metadata = 0; + if (metadata && num_bytes != root->fs_info->nodesize) { + error("ignore invalid metadata extent, length %llu does not equal to %u", + num_bytes, root->fs_info->nodesize); + return -EIO; + } + if (!metadata && !IS_ALIGNED(num_bytes, root->fs_info->sectorsize)) { + error("ignore invalid data extent, length %llu is not aligned to %u", + num_bytes, root->fs_info->sectorsize); + return -EIO; + } + + memset(&tmpl, 0, sizeof(tmpl)); + tmpl.start = key.objectid; + tmpl.nr = num_bytes; + tmpl.extent_item_refs = refs; + tmpl.metadata = metadata; + tmpl.found_rec = 1; + tmpl.max_size = num_bytes; + add_extent_rec(extent_cache, &tmpl); + + ptr = (unsigned long)(ei + 1); + if (btrfs_extent_flags(eb, ei) & BTRFS_EXTENT_FLAG_TREE_BLOCK && + key.type == BTRFS_EXTENT_ITEM_KEY) + ptr += sizeof(struct btrfs_tree_block_info); + + end = (unsigned long)ei + item_size; + while (ptr < end) { + iref = (struct btrfs_extent_inline_ref *)ptr; + type = btrfs_extent_inline_ref_type(eb, iref); + offset = btrfs_extent_inline_ref_offset(eb, iref); + switch (type) { + case BTRFS_TREE_BLOCK_REF_KEY: + ret = add_tree_backref(extent_cache, key.objectid, + 0, offset, 0); + if (ret < 0) + error( + "add_tree_backref failed (extent items tree block): %s", + strerror(-ret)); + break; + case BTRFS_SHARED_BLOCK_REF_KEY: + ret = add_tree_backref(extent_cache, key.objectid, + offset, 0, 0); + if (ret < 0) + error( + "add_tree_backref failed (extent items shared block): %s", + strerror(-ret)); + break; + case BTRFS_EXTENT_DATA_REF_KEY: + dref = (struct btrfs_extent_data_ref *)(&iref->offset); + add_data_backref(extent_cache, key.objectid, 0, + btrfs_extent_data_ref_root(eb, dref), + btrfs_extent_data_ref_objectid(eb, + dref), + btrfs_extent_data_ref_offset(eb, dref), + btrfs_extent_data_ref_count(eb, dref), + 0, num_bytes); + break; + case BTRFS_SHARED_DATA_REF_KEY: + sref = (struct btrfs_shared_data_ref *)(iref + 1); + add_data_backref(extent_cache, key.objectid, offset, + 0, 0, 0, + btrfs_shared_data_ref_count(eb, sref), + 0, num_bytes); + break; + default: + fprintf(stderr, + "corrupt extent record: key [%llu,%u,%llu]\n", + key.objectid, key.type, num_bytes); + goto out; + } + ptr += btrfs_extent_inline_ref_size(type); + } + WARN_ON(ptr > end); +out: + return 0; +} + +static int check_cache_range(struct btrfs_root *root, + struct btrfs_block_group_cache *cache, + u64 offset, u64 bytes) +{ + struct btrfs_free_space *entry; + u64 *logical; + u64 bytenr; + int stripe_len; + int i, nr, ret; + + for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { + bytenr = btrfs_sb_offset(i); + ret = btrfs_rmap_block(root->fs_info, + cache->key.objectid, bytenr, 0, + &logical, &nr, &stripe_len); + if (ret) + return ret; + + while (nr--) { + if (logical[nr] + stripe_len <= offset) + continue; + if (offset + bytes <= logical[nr]) + continue; + if (logical[nr] == offset) { + if (stripe_len >= bytes) { + free(logical); + return 0; + } + bytes -= stripe_len; + offset += stripe_len; + } else if (logical[nr] < offset) { + if (logical[nr] + stripe_len >= + offset + bytes) { + free(logical); + return 0; + } + bytes = (offset + bytes) - + (logical[nr] + stripe_len); + offset = logical[nr] + stripe_len; + } else { + /* + * Could be tricky, the super may land in the + * middle of the area we're checking. First + * check the easiest case, it's at the end. + */ + if (logical[nr] + stripe_len >= + bytes + offset) { + bytes = logical[nr] - offset; + continue; + } + + /* Check the left side */ + ret = check_cache_range(root, cache, + offset, + logical[nr] - offset); + if (ret) { + free(logical); + return ret; + } + + /* Now we continue with the right side */ + bytes = (offset + bytes) - + (logical[nr] + stripe_len); + offset = logical[nr] + stripe_len; + } + } + + free(logical); + } + + entry = btrfs_find_free_space(cache->free_space_ctl, offset, bytes); + if (!entry) { + fprintf(stderr, "there is no free space entry for %llu-%llu\n", + offset, offset+bytes); + return -EINVAL; + } + + if (entry->offset != offset) { + fprintf(stderr, "wanted offset %llu, found %llu\n", offset, + entry->offset); + return -EINVAL; + } + + if (entry->bytes != bytes) { + fprintf(stderr, "wanted bytes %llu, found %llu for off %llu\n", + bytes, entry->bytes, offset); + return -EINVAL; + } + + unlink_free_space(cache->free_space_ctl, entry); + free(entry); + return 0; +} + +static int verify_space_cache(struct btrfs_root *root, + struct btrfs_block_group_cache *cache) +{ + struct btrfs_path path; + struct extent_buffer *leaf; + struct btrfs_key key; + u64 last; + int ret = 0; + + root = root->fs_info->extent_root; + + last = max_t(u64, cache->key.objectid, BTRFS_SUPER_INFO_OFFSET); + + btrfs_init_path(&path); + key.objectid = last; + key.offset = 0; + key.type = BTRFS_EXTENT_ITEM_KEY; + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); + if (ret < 0) + goto out; + ret = 0; + while (1) { + if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { + ret = btrfs_next_leaf(root, &path); + if (ret < 0) + goto out; + if (ret > 0) { + ret = 0; + break; + } + } + leaf = path.nodes[0]; + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.objectid >= cache->key.offset + cache->key.objectid) + break; + if (key.type != BTRFS_EXTENT_ITEM_KEY && + key.type != BTRFS_METADATA_ITEM_KEY) { + path.slots[0]++; + continue; + } + + if (last == key.objectid) { + if (key.type == BTRFS_EXTENT_ITEM_KEY) + last = key.objectid + key.offset; + else + last = key.objectid + root->fs_info->nodesize; + path.slots[0]++; + continue; + } + + ret = check_cache_range(root, cache, last, + key.objectid - last); + if (ret) + break; + if (key.type == BTRFS_EXTENT_ITEM_KEY) + last = key.objectid + key.offset; + else + last = key.objectid + root->fs_info->nodesize; + path.slots[0]++; + } + + if (last < cache->key.objectid + cache->key.offset) + ret = check_cache_range(root, cache, last, + cache->key.objectid + + cache->key.offset - last); + +out: + btrfs_release_path(&path); + + if (!ret && + !RB_EMPTY_ROOT(&cache->free_space_ctl->free_space_offset)) { + fprintf(stderr, "There are still entries left in the space " + "cache\n"); + ret = -EINVAL; + } + + return ret; +} + +static int check_space_cache(struct btrfs_root *root) +{ + struct btrfs_block_group_cache *cache; + u64 start = BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE; + int ret; + int error = 0; + + if (btrfs_super_cache_generation(root->fs_info->super_copy) != -1ULL && + btrfs_super_generation(root->fs_info->super_copy) != + btrfs_super_cache_generation(root->fs_info->super_copy)) { + printf("cache and super generation don't match, space cache " + "will be invalidated\n"); + return 0; + } + + if (ctx.progress_enabled) { + ctx.tp = TASK_FREE_SPACE; + task_start(ctx.info); + } + + while (1) { + cache = btrfs_lookup_first_block_group(root->fs_info, start); + if (!cache) + break; + + start = cache->key.objectid + cache->key.offset; + if (!cache->free_space_ctl) { + if (btrfs_init_free_space_ctl(cache, + root->fs_info->sectorsize)) { + ret = -ENOMEM; + break; + } + } else { + btrfs_remove_free_space_cache(cache); + } + + if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE)) { + ret = exclude_super_stripes(root, cache); + if (ret) { + fprintf(stderr, "could not exclude super stripes: %s\n", + strerror(-ret)); + error++; + continue; + } + ret = load_free_space_tree(root->fs_info, cache); + free_excluded_extents(root, cache); + if (ret < 0) { + fprintf(stderr, "could not load free space tree: %s\n", + strerror(-ret)); + error++; + continue; + } + error += ret; + } else { + ret = load_free_space_cache(root->fs_info, cache); + if (!ret) + continue; + } + + ret = verify_space_cache(root, cache); + if (ret) { + fprintf(stderr, "cache appears valid but isn't %llu\n", + cache->key.objectid); + error++; + } + } + + task_stop(ctx.info); + + return error ? -EINVAL : 0; +} + +static int check_extent_csums(struct btrfs_root *root, u64 bytenr, + u64 num_bytes, unsigned long leaf_offset, + struct extent_buffer *eb) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + u64 offset = 0; + u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); + char *data; + unsigned long csum_offset; + u32 csum; + u32 csum_expected; + u64 read_len; + u64 data_checked = 0; + u64 tmp; + int ret = 0; + int mirror; + int num_copies; + + if (num_bytes % fs_info->sectorsize) + return -EINVAL; + + data = malloc(num_bytes); + if (!data) + return -ENOMEM; + + while (offset < num_bytes) { + mirror = 0; +again: + read_len = num_bytes - offset; + /* read as much space once a time */ + ret = read_extent_data(fs_info, data + offset, + bytenr + offset, &read_len, mirror); + if (ret) + goto out; + data_checked = 0; + /* verify every 4k data's checksum */ + while (data_checked < read_len) { + csum = ~(u32)0; + tmp = offset + data_checked; + + csum = btrfs_csum_data((char *)data + tmp, + csum, fs_info->sectorsize); + btrfs_csum_final(csum, (u8 *)&csum); + + csum_offset = leaf_offset + + tmp / fs_info->sectorsize * csum_size; + read_extent_buffer(eb, (char *)&csum_expected, + csum_offset, csum_size); + /* try another mirror */ + if (csum != csum_expected) { + fprintf(stderr, "mirror %d bytenr %llu csum %u expected csum %u\n", + mirror, bytenr + tmp, + csum, csum_expected); + num_copies = btrfs_num_copies(root->fs_info, + bytenr, num_bytes); + if (mirror < num_copies - 1) { + mirror += 1; + goto again; + } + } + data_checked += fs_info->sectorsize; + } + offset += read_len; + } +out: + free(data); + return ret; +} + +static int check_extent_exists(struct btrfs_root *root, u64 bytenr, + u64 num_bytes) +{ + struct btrfs_path path; + struct extent_buffer *leaf; + struct btrfs_key key; + int ret; + + btrfs_init_path(&path); + key.objectid = bytenr; + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = (u64)-1; + +again: + ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, &path, + 0, 0); + if (ret < 0) { + fprintf(stderr, "Error looking up extent record %d\n", ret); + btrfs_release_path(&path); + return ret; + } else if (ret) { + if (path.slots[0] > 0) { + path.slots[0]--; + } else { + ret = btrfs_prev_leaf(root, &path); + if (ret < 0) { + goto out; + } else if (ret > 0) { + ret = 0; + goto out; + } + } + } + + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + + /* + * Block group items come before extent items if they have the same + * bytenr, so walk back one more just in case. Dear future traveller, + * first congrats on mastering time travel. Now if it's not too much + * trouble could you go back to 2006 and tell Chris to make the + * BLOCK_GROUP_ITEM_KEY (and BTRFS_*_REF_KEY) lower than the + * EXTENT_ITEM_KEY please? + */ + while (key.type > BTRFS_EXTENT_ITEM_KEY) { + if (path.slots[0] > 0) { + path.slots[0]--; + } else { + ret = btrfs_prev_leaf(root, &path); + if (ret < 0) { + goto out; + } else if (ret > 0) { + ret = 0; + goto out; + } + } + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + } + + while (num_bytes) { + if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { + ret = btrfs_next_leaf(root, &path); + if (ret < 0) { + fprintf(stderr, "Error going to next leaf " + "%d\n", ret); + btrfs_release_path(&path); + return ret; + } else if (ret) { + break; + } + } + leaf = path.nodes[0]; + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.type != BTRFS_EXTENT_ITEM_KEY) { + path.slots[0]++; + continue; + } + if (key.objectid + key.offset < bytenr) { + path.slots[0]++; + continue; + } + if (key.objectid > bytenr + num_bytes) + break; + + if (key.objectid == bytenr) { + if (key.offset >= num_bytes) { + num_bytes = 0; + break; + } + num_bytes -= key.offset; + bytenr += key.offset; + } else if (key.objectid < bytenr) { + if (key.objectid + key.offset >= bytenr + num_bytes) { + num_bytes = 0; + break; + } + num_bytes = (bytenr + num_bytes) - + (key.objectid + key.offset); + bytenr = key.objectid + key.offset; + } else { + if (key.objectid + key.offset < bytenr + num_bytes) { + u64 new_start = key.objectid + key.offset; + u64 new_bytes = bytenr + num_bytes - new_start; + + /* + * Weird case, the extent is in the middle of + * our range, we'll have to search one side + * and then the other. Not sure if this happens + * in real life, but no harm in coding it up + * anyway just in case. + */ + btrfs_release_path(&path); + ret = check_extent_exists(root, new_start, + new_bytes); + if (ret) { + fprintf(stderr, "Right section didn't " + "have a record\n"); + break; + } + num_bytes = key.objectid - bytenr; + goto again; + } + num_bytes = key.objectid - bytenr; + } + path.slots[0]++; + } + ret = 0; + +out: + if (num_bytes && !ret) { + fprintf(stderr, + "there are no extents for csum range %llu-%llu\n", + bytenr, bytenr+num_bytes); + ret = 1; + } + + btrfs_release_path(&path); + return ret; +} + +static int check_csums(struct btrfs_root *root) +{ + struct btrfs_path path; + struct extent_buffer *leaf; + struct btrfs_key key; + u64 offset = 0, num_bytes = 0; + u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); + int errors = 0; + int ret; + u64 data_len; + unsigned long leaf_offset; + + root = root->fs_info->csum_root; + if (!extent_buffer_uptodate(root->node)) { + fprintf(stderr, "No valid csum tree found\n"); + return -ENOENT; + } + + btrfs_init_path(&path); + key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; + key.type = BTRFS_EXTENT_CSUM_KEY; + key.offset = 0; + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); + if (ret < 0) { + fprintf(stderr, "Error searching csum tree %d\n", ret); + btrfs_release_path(&path); + return ret; + } + + if (ret > 0 && path.slots[0]) + path.slots[0]--; + ret = 0; + + while (1) { + if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { + ret = btrfs_next_leaf(root, &path); + if (ret < 0) { + fprintf(stderr, "Error going to next leaf " + "%d\n", ret); + break; + } + if (ret) + break; + } + leaf = path.nodes[0]; + + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.type != BTRFS_EXTENT_CSUM_KEY) { + path.slots[0]++; + continue; + } + + data_len = (btrfs_item_size_nr(leaf, path.slots[0]) / + csum_size) * root->fs_info->sectorsize; + if (!check_data_csum) + goto skip_csum_check; + leaf_offset = btrfs_item_ptr_offset(leaf, path.slots[0]); + ret = check_extent_csums(root, key.offset, data_len, + leaf_offset, leaf); + if (ret) + break; +skip_csum_check: + if (!num_bytes) { + offset = key.offset; + } else if (key.offset != offset + num_bytes) { + ret = check_extent_exists(root, offset, num_bytes); + if (ret) { + fprintf(stderr, + "csum exists for %llu-%llu but there is no extent record\n", + offset, offset+num_bytes); + errors++; + } + offset = key.offset; + num_bytes = 0; + } + num_bytes += data_len; + path.slots[0]++; + } + + btrfs_release_path(&path); + return errors; +} + +static int is_dropped_key(struct btrfs_key *key, + struct btrfs_key *drop_key) +{ + if (key->objectid < drop_key->objectid) + return 1; + else if (key->objectid == drop_key->objectid) { + if (key->type < drop_key->type) + return 1; + else if (key->type == drop_key->type) { + if (key->offset < drop_key->offset) + return 1; + } + } + return 0; +} + +/* + * Here are the rules for FULL_BACKREF. + * + * 1) If BTRFS_HEADER_FLAG_RELOC is set then we have FULL_BACKREF set. + * 2) If btrfs_header_owner(buf) no longer points to buf then we have + * FULL_BACKREF set. + * 3) We cowed the block walking down a reloc tree. This is impossible to tell + * if it happened after the relocation occurred since we'll have dropped the + * reloc root, so it's entirely possible to have FULL_BACKREF set on buf and + * have no real way to know for sure. + * + * We process the blocks one root at a time, and we start from the lowest root + * objectid and go to the highest. So we can just lookup the owner backref for + * the record and if we don't find it then we know it doesn't exist and we have + * a FULL BACKREF. + * + * FIXME: if we ever start reclaiming root objectid's then we need to fix this + * assumption and simply indicate that we _think_ that the FULL BACKREF needs to + * be set or not and then we can check later once we've gathered all the refs. + */ +static int calc_extent_flag(struct cache_tree *extent_cache, + struct extent_buffer *buf, + struct root_item_record *ri, + u64 *flags) +{ + struct extent_record *rec; + struct cache_extent *cache; + struct tree_backref *tback; + u64 owner = 0; + + cache = lookup_cache_extent(extent_cache, buf->start, 1); + /* we have added this extent before */ + if (!cache) + return -ENOENT; + + rec = container_of(cache, struct extent_record, cache); + + /* + * Except file/reloc tree, we can not have + * FULL BACKREF MODE + */ + if (ri->objectid < BTRFS_FIRST_FREE_OBJECTID) + goto normal; + /* + * root node + */ + if (buf->start == ri->bytenr) + goto normal; + + if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC)) + goto full_backref; + + owner = btrfs_header_owner(buf); + if (owner == ri->objectid) + goto normal; + + tback = find_tree_backref(rec, 0, owner); + if (!tback) + goto full_backref; +normal: + *flags = 0; + if (rec->flag_block_full_backref != FLAG_UNSET && + rec->flag_block_full_backref != 0) + rec->bad_full_backref = 1; + return 0; +full_backref: + *flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; + if (rec->flag_block_full_backref != FLAG_UNSET && + rec->flag_block_full_backref != 1) + rec->bad_full_backref = 1; + return 0; +} + +static void report_mismatch_key_root(u8 key_type, u64 rootid) +{ + fprintf(stderr, "Invalid key type("); + print_key_type(stderr, 0, key_type); + fprintf(stderr, ") found in root("); + print_objectid(stderr, rootid, 0); + fprintf(stderr, ")\n"); +} + +/* + * Check if the key is valid with its extent buffer. + * + * This is a early check in case invalid key exists in a extent buffer + * This is not comprehensive yet, but should prevent wrong key/item passed + * further + */ +static int check_type_with_root(u64 rootid, u8 key_type) +{ + switch (key_type) { + /* Only valid in chunk tree */ + case BTRFS_DEV_ITEM_KEY: + case BTRFS_CHUNK_ITEM_KEY: + if (rootid != BTRFS_CHUNK_TREE_OBJECTID) + goto err; + break; + /* valid in csum and log tree */ + case BTRFS_CSUM_TREE_OBJECTID: + if (!(rootid == BTRFS_TREE_LOG_OBJECTID || + is_fstree(rootid))) + goto err; + break; + case BTRFS_EXTENT_ITEM_KEY: + case BTRFS_METADATA_ITEM_KEY: + case BTRFS_BLOCK_GROUP_ITEM_KEY: + if (rootid != BTRFS_EXTENT_TREE_OBJECTID) + goto err; + break; + case BTRFS_ROOT_ITEM_KEY: + if (rootid != BTRFS_ROOT_TREE_OBJECTID) + goto err; + break; + case BTRFS_DEV_EXTENT_KEY: + if (rootid != BTRFS_DEV_TREE_OBJECTID) + goto err; + break; + } + return 0; +err: + report_mismatch_key_root(key_type, rootid); + return -EINVAL; +} + +static int run_next_block(struct btrfs_root *root, + struct block_info *bits, + int bits_nr, + u64 *last, + struct cache_tree *pending, + struct cache_tree *seen, + struct cache_tree *reada, + struct cache_tree *nodes, + struct cache_tree *extent_cache, + struct cache_tree *chunk_cache, + struct rb_root *dev_cache, + struct block_group_tree *block_group_cache, + struct device_extent_tree *dev_extent_cache, + struct root_item_record *ri) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + struct extent_buffer *buf; + struct extent_record *rec = NULL; + u64 bytenr; + u32 size; + u64 parent; + u64 owner; + u64 flags; + u64 ptr; + u64 gen = 0; + int ret = 0; + int i; + int nritems; + struct btrfs_key key; + struct cache_extent *cache; + int reada_bits; + + nritems = pick_next_pending(pending, reada, nodes, *last, bits, + bits_nr, &reada_bits); + if (nritems == 0) + return 1; + + if (!reada_bits) { + for (i = 0; i < nritems; i++) { + ret = add_cache_extent(reada, bits[i].start, + bits[i].size); + if (ret == -EEXIST) + continue; + + /* fixme, get the parent transid */ + readahead_tree_block(fs_info, bits[i].start, 0); + } + } + *last = bits[0].start; + bytenr = bits[0].start; + size = bits[0].size; + + cache = lookup_cache_extent(pending, bytenr, size); + if (cache) { + remove_cache_extent(pending, cache); + free(cache); + } + cache = lookup_cache_extent(reada, bytenr, size); + if (cache) { + remove_cache_extent(reada, cache); + free(cache); + } + cache = lookup_cache_extent(nodes, bytenr, size); + if (cache) { + remove_cache_extent(nodes, cache); + free(cache); + } + cache = lookup_cache_extent(extent_cache, bytenr, size); + if (cache) { + rec = container_of(cache, struct extent_record, cache); + gen = rec->parent_generation; + } + + /* fixme, get the real parent transid */ + buf = read_tree_block(root->fs_info, bytenr, gen); + if (!extent_buffer_uptodate(buf)) { + record_bad_block_io(root->fs_info, + extent_cache, bytenr, size); + goto out; + } + + nritems = btrfs_header_nritems(buf); + + flags = 0; + if (!init_extent_tree) { + ret = btrfs_lookup_extent_info(NULL, root, bytenr, + btrfs_header_level(buf), 1, NULL, + &flags); + if (ret < 0) { + ret = calc_extent_flag(extent_cache, buf, ri, &flags); + if (ret < 0) { + fprintf(stderr, "Couldn't calc extent flags\n"); + flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; + } + } + } else { + flags = 0; + ret = calc_extent_flag(extent_cache, buf, ri, &flags); + if (ret < 0) { + fprintf(stderr, "Couldn't calc extent flags\n"); + flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; + } + } + + if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) { + if (ri != NULL && + ri->objectid != BTRFS_TREE_RELOC_OBJECTID && + ri->objectid == btrfs_header_owner(buf)) { + /* + * Ok we got to this block from it's original owner and + * we have FULL_BACKREF set. Relocation can leave + * converted blocks over so this is altogether possible, + * however it's not possible if the generation > the + * last snapshot, so check for this case. + */ + if (!btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC) && + btrfs_header_generation(buf) > ri->last_snapshot) { + flags &= ~BTRFS_BLOCK_FLAG_FULL_BACKREF; + rec->bad_full_backref = 1; + } + } + } else { + if (ri != NULL && + (ri->objectid == BTRFS_TREE_RELOC_OBJECTID || + btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC))) { + flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; + rec->bad_full_backref = 1; + } + } + + if (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF) { + rec->flag_block_full_backref = 1; + parent = bytenr; + owner = 0; + } else { + rec->flag_block_full_backref = 0; + parent = 0; + owner = btrfs_header_owner(buf); + } + + ret = check_block(root, extent_cache, buf, flags); + if (ret) + goto out; + + if (btrfs_is_leaf(buf)) { + btree_space_waste += btrfs_leaf_free_space(root, buf); + for (i = 0; i < nritems; i++) { + struct btrfs_file_extent_item *fi; + + btrfs_item_key_to_cpu(buf, &key, i); + /* + * Check key type against the leaf owner. + * Could filter quite a lot of early error if + * owner is correct + */ + if (check_type_with_root(btrfs_header_owner(buf), + key.type)) { + fprintf(stderr, "ignoring invalid key\n"); + continue; + } + if (key.type == BTRFS_EXTENT_ITEM_KEY) { + process_extent_item(root, extent_cache, buf, + i); + continue; + } + if (key.type == BTRFS_METADATA_ITEM_KEY) { + process_extent_item(root, extent_cache, buf, + i); + continue; + } + if (key.type == BTRFS_EXTENT_CSUM_KEY) { + total_csum_bytes += + btrfs_item_size_nr(buf, i); + continue; + } + if (key.type == BTRFS_CHUNK_ITEM_KEY) { + process_chunk_item(chunk_cache, &key, buf, i); + continue; + } + if (key.type == BTRFS_DEV_ITEM_KEY) { + process_device_item(dev_cache, &key, buf, i); + continue; + } + if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { + process_block_group_item(block_group_cache, + &key, buf, i); + continue; + } + if (key.type == BTRFS_DEV_EXTENT_KEY) { + process_device_extent_item(dev_extent_cache, + &key, buf, i); + continue; + + } + if (key.type == BTRFS_EXTENT_REF_V0_KEY) { +#ifdef BTRFS_COMPAT_EXTENT_TREE_V0 + process_extent_ref_v0(extent_cache, buf, i); +#else + BUG(); +#endif + continue; + } + + if (key.type == BTRFS_TREE_BLOCK_REF_KEY) { + ret = add_tree_backref(extent_cache, + key.objectid, 0, key.offset, 0); + if (ret < 0) + error( + "add_tree_backref failed (leaf tree block): %s", + strerror(-ret)); + continue; + } + if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) { + ret = add_tree_backref(extent_cache, + key.objectid, key.offset, 0, 0); + if (ret < 0) + error( + "add_tree_backref failed (leaf shared block): %s", + strerror(-ret)); + continue; + } + if (key.type == BTRFS_EXTENT_DATA_REF_KEY) { + struct btrfs_extent_data_ref *ref; + + ref = btrfs_item_ptr(buf, i, + struct btrfs_extent_data_ref); + add_data_backref(extent_cache, + key.objectid, 0, + btrfs_extent_data_ref_root(buf, ref), + btrfs_extent_data_ref_objectid(buf, + ref), + btrfs_extent_data_ref_offset(buf, ref), + btrfs_extent_data_ref_count(buf, ref), + 0, root->fs_info->sectorsize); + continue; + } + if (key.type == BTRFS_SHARED_DATA_REF_KEY) { + struct btrfs_shared_data_ref *ref; + + ref = btrfs_item_ptr(buf, i, + struct btrfs_shared_data_ref); + add_data_backref(extent_cache, + key.objectid, key.offset, 0, 0, 0, + btrfs_shared_data_ref_count(buf, ref), + 0, root->fs_info->sectorsize); + continue; + } + if (key.type == BTRFS_ORPHAN_ITEM_KEY) { + struct bad_item *bad; + + if (key.objectid == BTRFS_ORPHAN_OBJECTID) + continue; + if (!owner) + continue; + bad = malloc(sizeof(struct bad_item)); + if (!bad) + continue; + INIT_LIST_HEAD(&bad->list); + memcpy(&bad->key, &key, + sizeof(struct btrfs_key)); + bad->root_id = owner; + list_add_tail(&bad->list, &delete_items); + continue; + } + if (key.type != BTRFS_EXTENT_DATA_KEY) + continue; + fi = btrfs_item_ptr(buf, i, + struct btrfs_file_extent_item); + if (btrfs_file_extent_type(buf, fi) == + BTRFS_FILE_EXTENT_INLINE) + continue; + if (btrfs_file_extent_disk_bytenr(buf, fi) == 0) + continue; + + data_bytes_allocated += + btrfs_file_extent_disk_num_bytes(buf, fi); + if (data_bytes_allocated < root->fs_info->sectorsize) + abort(); + + data_bytes_referenced += + btrfs_file_extent_num_bytes(buf, fi); + add_data_backref(extent_cache, + btrfs_file_extent_disk_bytenr(buf, fi), + parent, owner, key.objectid, key.offset - + btrfs_file_extent_offset(buf, fi), 1, 1, + btrfs_file_extent_disk_num_bytes(buf, fi)); + } + } else { + int level; + struct btrfs_key first_key; + + first_key.objectid = 0; + + if (nritems > 0) + btrfs_item_key_to_cpu(buf, &first_key, 0); + level = btrfs_header_level(buf); + for (i = 0; i < nritems; i++) { + struct extent_record tmpl; + + ptr = btrfs_node_blockptr(buf, i); + size = root->fs_info->nodesize; + btrfs_node_key_to_cpu(buf, &key, i); + if (ri != NULL) { + if ((level == ri->drop_level) + && is_dropped_key(&key, &ri->drop_key)) { + continue; + } + } + + memset(&tmpl, 0, sizeof(tmpl)); + btrfs_cpu_key_to_disk(&tmpl.parent_key, &key); + tmpl.parent_generation = + btrfs_node_ptr_generation(buf, i); + tmpl.start = ptr; + tmpl.nr = size; + tmpl.refs = 1; + tmpl.metadata = 1; + tmpl.max_size = size; + ret = add_extent_rec(extent_cache, &tmpl); + if (ret < 0) + goto out; + + ret = add_tree_backref(extent_cache, ptr, parent, + owner, 1); + if (ret < 0) { + error( + "add_tree_backref failed (non-leaf block): %s", + strerror(-ret)); + continue; + } + + if (level > 1) + add_pending(nodes, seen, ptr, size); + else + add_pending(pending, seen, ptr, size); + } + btree_space_waste += (BTRFS_NODEPTRS_PER_BLOCK(fs_info) - + nritems) * sizeof(struct btrfs_key_ptr); + } + total_btree_bytes += buf->len; + if (fs_root_objectid(btrfs_header_owner(buf))) + total_fs_tree_bytes += buf->len; + if (btrfs_header_owner(buf) == BTRFS_EXTENT_TREE_OBJECTID) + total_extent_tree_bytes += buf->len; +out: + free_extent_buffer(buf); + return ret; +} + +static int add_root_to_pending(struct extent_buffer *buf, + struct cache_tree *extent_cache, + struct cache_tree *pending, + struct cache_tree *seen, + struct cache_tree *nodes, + u64 objectid) +{ + struct extent_record tmpl; + int ret; + + if (btrfs_header_level(buf) > 0) + add_pending(nodes, seen, buf->start, buf->len); + else + add_pending(pending, seen, buf->start, buf->len); + + memset(&tmpl, 0, sizeof(tmpl)); + tmpl.start = buf->start; + tmpl.nr = buf->len; + tmpl.is_root = 1; + tmpl.refs = 1; + tmpl.metadata = 1; + tmpl.max_size = buf->len; + add_extent_rec(extent_cache, &tmpl); + + if (objectid == BTRFS_TREE_RELOC_OBJECTID || + btrfs_header_backref_rev(buf) < BTRFS_MIXED_BACKREF_REV) + ret = add_tree_backref(extent_cache, buf->start, buf->start, + 0, 1); + else + ret = add_tree_backref(extent_cache, buf->start, 0, objectid, + 1); + return ret; +} + +/* as we fix the tree, we might be deleting blocks that + * we're tracking for repair. This hook makes sure we + * remove any backrefs for blocks as we are fixing them. + */ +static int free_extent_hook(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + u64 bytenr, u64 num_bytes, u64 parent, + u64 root_objectid, u64 owner, u64 offset, + int refs_to_drop) +{ + struct extent_record *rec; + struct cache_extent *cache; + int is_data; + struct cache_tree *extent_cache = root->fs_info->fsck_extent_cache; + + is_data = owner >= BTRFS_FIRST_FREE_OBJECTID; + cache = lookup_cache_extent(extent_cache, bytenr, num_bytes); + if (!cache) + return 0; + + rec = container_of(cache, struct extent_record, cache); + if (is_data) { + struct data_backref *back; + + back = find_data_backref(rec, parent, root_objectid, owner, + offset, 1, bytenr, num_bytes); + if (!back) + goto out; + if (back->node.found_ref) { + back->found_ref -= refs_to_drop; + if (rec->refs) + rec->refs -= refs_to_drop; + } + if (back->node.found_extent_tree) { + back->num_refs -= refs_to_drop; + if (rec->extent_item_refs) + rec->extent_item_refs -= refs_to_drop; + } + if (back->found_ref == 0) + back->node.found_ref = 0; + if (back->num_refs == 0) + back->node.found_extent_tree = 0; + + if (!back->node.found_extent_tree && back->node.found_ref) { + rb_erase(&back->node.node, &rec->backref_tree); + free(back); + } + } else { + struct tree_backref *back; + + back = find_tree_backref(rec, parent, root_objectid); + if (!back) + goto out; + if (back->node.found_ref) { + if (rec->refs) + rec->refs--; + back->node.found_ref = 0; + } + if (back->node.found_extent_tree) { + if (rec->extent_item_refs) + rec->extent_item_refs--; + back->node.found_extent_tree = 0; + } + if (!back->node.found_extent_tree && back->node.found_ref) { + rb_erase(&back->node.node, &rec->backref_tree); + free(back); + } + } + maybe_free_extent_rec(extent_cache, rec); +out: + return 0; +} + +static int delete_extent_records(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, + u64 bytenr) +{ + struct btrfs_key key; + struct btrfs_key found_key; + struct extent_buffer *leaf; + int ret; + int slot; + + + key.objectid = bytenr; + key.type = (u8)-1; + key.offset = (u64)-1; + + while (1) { + ret = btrfs_search_slot(trans, root->fs_info->extent_root, + &key, path, 0, 1); + if (ret < 0) + break; + + if (ret > 0) { + ret = 0; + if (path->slots[0] == 0) + break; + path->slots[0]--; + } + ret = 0; + + leaf = path->nodes[0]; + slot = path->slots[0]; + + btrfs_item_key_to_cpu(leaf, &found_key, slot); + if (found_key.objectid != bytenr) + break; + + if (found_key.type != BTRFS_EXTENT_ITEM_KEY && + found_key.type != BTRFS_METADATA_ITEM_KEY && + found_key.type != BTRFS_TREE_BLOCK_REF_KEY && + found_key.type != BTRFS_EXTENT_DATA_REF_KEY && + found_key.type != BTRFS_EXTENT_REF_V0_KEY && + found_key.type != BTRFS_SHARED_BLOCK_REF_KEY && + found_key.type != BTRFS_SHARED_DATA_REF_KEY) { + btrfs_release_path(path); + if (found_key.type == 0) { + if (found_key.offset == 0) + break; + key.offset = found_key.offset - 1; + key.type = found_key.type; + } + key.type = found_key.type - 1; + key.offset = (u64)-1; + continue; + } + + fprintf(stderr, + "repair deleting extent record: key [%llu,%u,%llu]\n", + found_key.objectid, found_key.type, found_key.offset); + + ret = btrfs_del_item(trans, root->fs_info->extent_root, path); + if (ret) + break; + btrfs_release_path(path); + + if (found_key.type == BTRFS_EXTENT_ITEM_KEY || + found_key.type == BTRFS_METADATA_ITEM_KEY) { + u64 bytes = (found_key.type == BTRFS_EXTENT_ITEM_KEY) ? + found_key.offset : root->fs_info->nodesize; + + ret = btrfs_update_block_group(root, bytenr, + bytes, 0, 0); + if (ret) + break; + } + } + + btrfs_release_path(path); + return ret; +} + +/* + * for a single backref, this will allocate a new extent + * and add the backref to it. + */ +static int record_extent(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *info, + struct btrfs_path *path, + struct extent_record *rec, + struct extent_backref *back, + int allocated, u64 flags) +{ + int ret = 0; + struct btrfs_root *extent_root = info->extent_root; + struct extent_buffer *leaf; + struct btrfs_key ins_key; + struct btrfs_extent_item *ei; + struct data_backref *dback; + struct btrfs_tree_block_info *bi; + + if (!back->is_data) + rec->max_size = max_t(u64, rec->max_size, + info->nodesize); + + if (!allocated) { + u32 item_size = sizeof(*ei); + + if (!back->is_data) + item_size += sizeof(*bi); + + ins_key.objectid = rec->start; + ins_key.offset = rec->max_size; + ins_key.type = BTRFS_EXTENT_ITEM_KEY; + + ret = btrfs_insert_empty_item(trans, extent_root, path, + &ins_key, item_size); + if (ret) + goto fail; + + leaf = path->nodes[0]; + ei = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_extent_item); + + btrfs_set_extent_refs(leaf, ei, 0); + btrfs_set_extent_generation(leaf, ei, rec->generation); + + if (back->is_data) { + btrfs_set_extent_flags(leaf, ei, + BTRFS_EXTENT_FLAG_DATA); + } else { + struct btrfs_disk_key copy_key; + + bi = (struct btrfs_tree_block_info *)(ei + 1); + memset_extent_buffer(leaf, 0, (unsigned long)bi, + sizeof(*bi)); + + btrfs_set_disk_key_objectid(©_key, + rec->info_objectid); + btrfs_set_disk_key_type(©_key, 0); + btrfs_set_disk_key_offset(©_key, 0); + + btrfs_set_tree_block_level(leaf, bi, rec->info_level); + btrfs_set_tree_block_key(leaf, bi, ©_key); + + btrfs_set_extent_flags(leaf, ei, + flags | BTRFS_EXTENT_FLAG_TREE_BLOCK); + } + + btrfs_mark_buffer_dirty(leaf); + ret = btrfs_update_block_group(extent_root, rec->start, + rec->max_size, 1, 0); + if (ret) + goto fail; + btrfs_release_path(path); + } + + if (back->is_data) { + u64 parent; + int i; + + dback = to_data_backref(back); + if (back->full_backref) + parent = dback->parent; + else + parent = 0; + + for (i = 0; i < dback->found_ref; i++) { + /* if parent != 0, we're doing a full backref + * passing BTRFS_FIRST_FREE_OBJECTID as the owner + * just makes the backref allocator create a data + * backref + */ + ret = btrfs_inc_extent_ref(trans, info->extent_root, + rec->start, rec->max_size, + parent, + dback->root, + parent ? + BTRFS_FIRST_FREE_OBJECTID : + dback->owner, + dback->offset); + if (ret) + break; + } + fprintf(stderr, +"adding new data backref on %llu %s %llu owner %llu offset %llu found %d\n", + (unsigned long long)rec->start, + back->full_backref ? "parent" : "root", + back->full_backref ? (unsigned long long)parent : + (unsigned long long)dback->root, + (unsigned long long)dback->owner, + (unsigned long long)dback->offset, dback->found_ref); + } else { + u64 parent; + struct tree_backref *tback; + + tback = to_tree_backref(back); + if (back->full_backref) + parent = tback->parent; + else + parent = 0; + + ret = btrfs_inc_extent_ref(trans, info->extent_root, + rec->start, rec->max_size, + parent, tback->root, 0, 0); + fprintf(stderr, +"adding new tree backref on start %llu len %llu parent %llu root %llu\n", + rec->start, rec->max_size, parent, tback->root); + } +fail: + btrfs_release_path(path); + return ret; +} + +static struct extent_entry *find_entry(struct list_head *entries, + u64 bytenr, u64 bytes) +{ + struct extent_entry *entry = NULL; + + list_for_each_entry(entry, entries, list) { + if (entry->bytenr == bytenr && entry->bytes == bytes) + return entry; + } + + return NULL; +} + +static struct extent_entry *find_most_right_entry(struct list_head *entries) +{ + struct extent_entry *entry, *best = NULL, *prev = NULL; + + list_for_each_entry(entry, entries, list) { + /* + * If there are as many broken entries as entries then we know + * not to trust this particular entry. + */ + if (entry->broken == entry->count) + continue; + + /* + * Special case, when there are only two entries and 'best' is + * the first one + */ + if (!prev) { + best = entry; + prev = entry; + continue; + } + + /* + * If our current entry == best then we can't be sure our best + * is really the best, so we need to keep searching. + */ + if (best && best->count == entry->count) { + prev = entry; + best = NULL; + continue; + } + + /* Prev == entry, not good enough, have to keep searching */ + if (!prev->broken && prev->count == entry->count) + continue; + + if (!best) + best = (prev->count > entry->count) ? prev : entry; + else if (best->count < entry->count) + best = entry; + prev = entry; + } + + return best; +} + +static int repair_ref(struct btrfs_fs_info *info, struct btrfs_path *path, + struct data_backref *dback, struct extent_entry *entry) +{ + struct btrfs_trans_handle *trans; + struct btrfs_root *root; + struct btrfs_file_extent_item *fi; + struct extent_buffer *leaf; + struct btrfs_key key; + u64 bytenr, bytes; + int ret, err; + + key.objectid = dback->root; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + root = btrfs_read_fs_root(info, &key); + if (IS_ERR(root)) { + fprintf(stderr, "Couldn't find root for our ref\n"); + return -EINVAL; + } + + /* + * The backref points to the original offset of the extent if it was + * split, so we need to search down to the offset we have and then walk + * forward until we find the backref we're looking for. + */ + key.objectid = dback->owner; + key.type = BTRFS_EXTENT_DATA_KEY; + key.offset = dback->offset; + ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); + if (ret < 0) { + fprintf(stderr, "Error looking up ref %d\n", ret); + return ret; + } + + while (1) { + if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { + ret = btrfs_next_leaf(root, path); + if (ret) { + fprintf(stderr, "Couldn't find our ref, next\n"); + return -EINVAL; + } + } + leaf = path->nodes[0]; + btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); + if (key.objectid != dback->owner || + key.type != BTRFS_EXTENT_DATA_KEY) { + fprintf(stderr, "Couldn't find our ref, search\n"); + return -EINVAL; + } + fi = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_file_extent_item); + bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); + bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); + + if (bytenr == dback->disk_bytenr && bytes == dback->bytes) + break; + path->slots[0]++; + } + + btrfs_release_path(path); + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); + + /* + * Ok we have the key of the file extent we want to fix, now we can cow + * down to the thing and fix it. + */ + ret = btrfs_search_slot(trans, root, &key, path, 0, 1); + if (ret < 0) { + fprintf(stderr, "error cowing down to ref [%llu,%u,%llu]: %d\n", + key.objectid, key.type, key.offset, ret); + goto out; + } + if (ret > 0) { + fprintf(stderr, + "well that's odd, we just found this key [%llu,%u,%llu]\n", + key.objectid, key.type, key.offset); + ret = -EINVAL; + goto out; + } + leaf = path->nodes[0]; + fi = btrfs_item_ptr(leaf, path->slots[0], + struct btrfs_file_extent_item); + + if (btrfs_file_extent_compression(leaf, fi) && + dback->disk_bytenr != entry->bytenr) { + fprintf(stderr, +"ref doesn't match the record start and is compressed, please take a btrfs-image of this file system and send it to a btrfs developer so they can complete this functionality for bytenr %llu\n", + dback->disk_bytenr); + ret = -EINVAL; + goto out; + } + + if (dback->node.broken && dback->disk_bytenr != entry->bytenr) { + btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr); + } else if (dback->disk_bytenr > entry->bytenr) { + u64 off_diff, offset; + + off_diff = dback->disk_bytenr - entry->bytenr; + offset = btrfs_file_extent_offset(leaf, fi); + if (dback->disk_bytenr + offset + + btrfs_file_extent_num_bytes(leaf, fi) > + entry->bytenr + entry->bytes) { + fprintf(stderr, +"ref is past the entry end, please take a btrfs-image of this file system and send it to a btrfs developer, ref %llu\n", + dback->disk_bytenr); + ret = -EINVAL; + goto out; + } + offset += off_diff; + btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr); + btrfs_set_file_extent_offset(leaf, fi, offset); + } else if (dback->disk_bytenr < entry->bytenr) { + u64 offset; + + offset = btrfs_file_extent_offset(leaf, fi); + if (dback->disk_bytenr + offset < entry->bytenr) { + fprintf(stderr, +"ref is before the entry start, please take a btrfs-image of this file system and send it to a btrfs developer, ref %llu\n", + dback->disk_bytenr); + ret = -EINVAL; + goto out; + } + + offset += dback->disk_bytenr; + offset -= entry->bytenr; + btrfs_set_file_extent_disk_bytenr(leaf, fi, entry->bytenr); + btrfs_set_file_extent_offset(leaf, fi, offset); + } + + btrfs_set_file_extent_disk_num_bytes(leaf, fi, entry->bytes); + + /* + * Chances are if disk_num_bytes were wrong then so is ram_bytes, but + * only do this if we aren't using compression, otherwise it's a + * trickier case. + */ + if (!btrfs_file_extent_compression(leaf, fi)) + btrfs_set_file_extent_ram_bytes(leaf, fi, entry->bytes); + else + printf("ram bytes may be wrong?\n"); + btrfs_mark_buffer_dirty(leaf); +out: + err = btrfs_commit_transaction(trans, root); + btrfs_release_path(path); + return ret ? ret : err; +} + +static int verify_backrefs(struct btrfs_fs_info *info, struct btrfs_path *path, + struct extent_record *rec) +{ + struct extent_backref *back, *tmp; + struct data_backref *dback; + struct extent_entry *entry, *best = NULL; + LIST_HEAD(entries); + int nr_entries = 0; + int broken_entries = 0; + int ret = 0; + short mismatch = 0; + + /* + * Metadata is easy and the backrefs should always agree on bytenr and + * size, if not we've got bigger issues. + */ + if (rec->metadata) + return 0; + + rbtree_postorder_for_each_entry_safe(back, tmp, + &rec->backref_tree, node) { + if (back->full_backref || !back->is_data) + continue; + + dback = to_data_backref(back); + + /* + * We only pay attention to backrefs that we found a real + * backref for. + */ + if (dback->found_ref == 0) + continue; + + /* + * For now we only catch when the bytes don't match, not the + * bytenr. We can easily do this at the same time, but I want + * to have a fs image to test on before we just add repair + * functionality willy-nilly so we know we won't screw up the + * repair. + */ + + entry = find_entry(&entries, dback->disk_bytenr, + dback->bytes); + if (!entry) { + entry = malloc(sizeof(struct extent_entry)); + if (!entry) { + ret = -ENOMEM; + goto out; + } + memset(entry, 0, sizeof(*entry)); + entry->bytenr = dback->disk_bytenr; + entry->bytes = dback->bytes; + list_add_tail(&entry->list, &entries); + nr_entries++; + } + + /* + * If we only have on entry we may think the entries agree when + * in reality they don't so we have to do some extra checking. + */ + if (dback->disk_bytenr != rec->start || + dback->bytes != rec->nr || back->broken) + mismatch = 1; + + if (back->broken) { + entry->broken++; + broken_entries++; + } + + entry->count++; + } + + /* Yay all the backrefs agree, carry on good sir */ + if (nr_entries <= 1 && !mismatch) + goto out; + + fprintf(stderr, + "attempting to repair backref discrepency for bytenr %llu\n", + rec->start); + + /* + * First we want to see if the backrefs can agree amongst themselves who + * is right, so figure out which one of the entries has the highest + * count. + */ + best = find_most_right_entry(&entries); + + /* + * Ok so we may have an even split between what the backrefs think, so + * this is where we use the extent ref to see what it thinks. + */ + if (!best) { + entry = find_entry(&entries, rec->start, rec->nr); + if (!entry && (!broken_entries || !rec->found_rec)) { + fprintf(stderr, +"backrefs don't agree with each other and extent record doesn't agree with anybody, so we can't fix bytenr %llu bytes %llu\n", + rec->start, rec->nr); + ret = -EINVAL; + goto out; + } else if (!entry) { + /* + * Ok our backrefs were broken, we'll assume this is the + * correct value and add an entry for this range. + */ + entry = malloc(sizeof(struct extent_entry)); + if (!entry) { + ret = -ENOMEM; + goto out; + } + memset(entry, 0, sizeof(*entry)); + entry->bytenr = rec->start; + entry->bytes = rec->nr; + list_add_tail(&entry->list, &entries); + nr_entries++; + } + entry->count++; + best = find_most_right_entry(&entries); + if (!best) { + fprintf(stderr, +"backrefs and extent record evenly split on who is right, this is going to require user input to fix bytenr %llu bytes %llu\n", + rec->start, rec->nr); + ret = -EINVAL; + goto out; + } + } + + /* + * I don't think this can happen currently as we'll abort() if we catch + * this case higher up, but in case somebody removes that we still can't + * deal with it properly here yet, so just bail out of that's the case. + */ + if (best->bytenr != rec->start) { + fprintf(stderr, +"extent start and backref starts don't match, please use btrfs-image on this file system and send it to a btrfs developer so they can make fsck fix this particular case. bytenr is %llu, bytes is %llu\n", + rec->start, rec->nr); + ret = -EINVAL; + goto out; + } + + /* + * Ok great we all agreed on an extent record, let's go find the real + * references and fix up the ones that don't match. + */ + rbtree_postorder_for_each_entry_safe(back, tmp, + &rec->backref_tree, node) { + if (back->full_backref || !back->is_data) + continue; + + dback = to_data_backref(back); + + /* + * Still ignoring backrefs that don't have a real ref attached + * to them. + */ + if (dback->found_ref == 0) + continue; + + if (dback->bytes == best->bytes && + dback->disk_bytenr == best->bytenr) + continue; + + ret = repair_ref(info, path, dback, best); + if (ret) + goto out; + } + + /* + * Ok we messed with the actual refs, which means we need to drop our + * entire cache and go back and rescan. I know this is a huge pain and + * adds a lot of extra work, but it's the only way to be safe. Once all + * the backrefs agree we may not need to do anything to the extent + * record itself. + */ + ret = -EAGAIN; +out: + while (!list_empty(&entries)) { + entry = list_entry(entries.next, struct extent_entry, list); + list_del_init(&entry->list); + free(entry); + } + return ret; +} + +static int process_duplicates(struct cache_tree *extent_cache, + struct extent_record *rec) +{ + struct extent_record *good, *tmp; + struct cache_extent *cache; + int ret; + + /* + * If we found a extent record for this extent then return, or if we + * have more than one duplicate we are likely going to need to delete + * something. + */ + if (rec->found_rec || rec->num_duplicates > 1) + return 0; + + /* Shouldn't happen but just in case */ + BUG_ON(!rec->num_duplicates); + + /* + * So this happens if we end up with a backref that doesn't match the + * actual extent entry. So either the backref is bad or the extent + * entry is bad. Either way we want to have the extent_record actually + * reflect what we found in the extent_tree, so we need to take the + * duplicate out and use that as the extent_record since the only way we + * get a duplicate is if we find a real life BTRFS_EXTENT_ITEM_KEY. + */ + remove_cache_extent(extent_cache, &rec->cache); + + good = to_extent_record(rec->dups.next); + list_del_init(&good->list); + INIT_LIST_HEAD(&good->backrefs); + INIT_LIST_HEAD(&good->dups); + good->cache.start = good->start; + good->cache.size = good->nr; + good->content_checked = 0; + good->owner_ref_checked = 0; + good->num_duplicates = 0; + good->refs = rec->refs; + list_splice_init(&rec->backrefs, &good->backrefs); + while (1) { + cache = lookup_cache_extent(extent_cache, good->start, + good->nr); + if (!cache) + break; + tmp = container_of(cache, struct extent_record, cache); + + /* + * If we find another overlapping extent and it's found_rec is + * set then it's a duplicate and we need to try and delete + * something. + */ + if (tmp->found_rec || tmp->num_duplicates > 0) { + if (list_empty(&good->list)) + list_add_tail(&good->list, + &duplicate_extents); + good->num_duplicates += tmp->num_duplicates + 1; + list_splice_init(&tmp->dups, &good->dups); + list_del_init(&tmp->list); + list_add_tail(&tmp->list, &good->dups); + remove_cache_extent(extent_cache, &tmp->cache); + continue; + } + + /* + * Ok we have another non extent item backed extent rec, so lets + * just add it to this extent and carry on like we did above. + */ + good->refs += tmp->refs; + list_splice_init(&tmp->backrefs, &good->backrefs); + remove_cache_extent(extent_cache, &tmp->cache); + free(tmp); + } + ret = insert_cache_extent(extent_cache, &good->cache); + BUG_ON(ret); + free(rec); + return good->num_duplicates ? 0 : 1; +} + +static int delete_duplicate_records(struct btrfs_root *root, + struct extent_record *rec) +{ + struct btrfs_trans_handle *trans; + LIST_HEAD(delete_list); + struct btrfs_path path; + struct extent_record *tmp, *good, *n; + int nr_del = 0; + int ret = 0, err; + struct btrfs_key key; + + btrfs_init_path(&path); + + good = rec; + /* Find the record that covers all of the duplicates. */ + list_for_each_entry(tmp, &rec->dups, list) { + if (good->start < tmp->start) + continue; + if (good->nr > tmp->nr) + continue; + + if (tmp->start + tmp->nr < good->start + good->nr) { + fprintf(stderr, +"Ok we have overlapping extents that aren't completely covered by each other, this is going to require more careful thought. The extents are [%llu-%llu] and [%llu-%llu]\n", + tmp->start, tmp->nr, good->start, good->nr); + abort(); + } + good = tmp; + } + + if (good != rec) + list_add_tail(&rec->list, &delete_list); + + list_for_each_entry_safe(tmp, n, &rec->dups, list) { + if (tmp == good) + continue; + list_move_tail(&tmp->list, &delete_list); + } + + root = root->fs_info->extent_root; + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } + + list_for_each_entry(tmp, &delete_list, list) { + if (tmp->found_rec == 0) + continue; + key.objectid = tmp->start; + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = tmp->nr; + + /* Shouldn't happen but just in case */ + if (tmp->metadata) { + fprintf(stderr, +"well this shouldn't happen, extent record overlaps but is metadata? [%llu, %llu]\n", + tmp->start, tmp->nr); + abort(); + } + + ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); + if (ret) { + if (ret > 0) + ret = -EINVAL; + break; + } + ret = btrfs_del_item(trans, root, &path); + if (ret) + break; + btrfs_release_path(&path); + nr_del++; + } + err = btrfs_commit_transaction(trans, root); + if (err && !ret) + ret = err; +out: + while (!list_empty(&delete_list)) { + tmp = to_extent_record(delete_list.next); + list_del_init(&tmp->list); + if (tmp == rec) + continue; + free(tmp); + } + + while (!list_empty(&rec->dups)) { + tmp = to_extent_record(rec->dups.next); + list_del_init(&tmp->list); + free(tmp); + } + + btrfs_release_path(&path); + + if (!ret && !nr_del) + rec->num_duplicates = 0; + + return ret ? ret : nr_del; +} + +static int find_possible_backrefs(struct btrfs_fs_info *info, + struct btrfs_path *path, + struct cache_tree *extent_cache, + struct extent_record *rec) +{ + struct btrfs_root *root; + struct extent_backref *back, *tmp; + struct data_backref *dback; + struct cache_extent *cache; + struct btrfs_file_extent_item *fi; + struct btrfs_key key; + u64 bytenr, bytes; + int ret; + + rbtree_postorder_for_each_entry_safe(back, tmp, + &rec->backref_tree, node) { + /* Don't care about full backrefs (poor unloved backrefs) */ + if (back->full_backref || !back->is_data) + continue; + + dback = to_data_backref(back); + + /* We found this one, we don't need to do a lookup */ + if (dback->found_ref) + continue; + + key.objectid = dback->root; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + + root = btrfs_read_fs_root(info, &key); + + /* No root, definitely a bad ref, skip */ + if (IS_ERR(root) && PTR_ERR(root) == -ENOENT) + continue; + /* Other err, exit */ + if (IS_ERR(root)) + return PTR_ERR(root); + + key.objectid = dback->owner; + key.type = BTRFS_EXTENT_DATA_KEY; + key.offset = dback->offset; + ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); + if (ret) { + btrfs_release_path(path); + if (ret < 0) + return ret; + /* Didn't find it, we can carry on */ + ret = 0; + continue; + } + + fi = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_file_extent_item); + bytenr = btrfs_file_extent_disk_bytenr(path->nodes[0], fi); + bytes = btrfs_file_extent_disk_num_bytes(path->nodes[0], fi); + btrfs_release_path(path); + cache = lookup_cache_extent(extent_cache, bytenr, 1); + if (cache) { + struct extent_record *tmp; + + tmp = container_of(cache, struct extent_record, cache); + + /* + * If we found an extent record for the bytenr for this + * particular backref then we can't add it to our + * current extent record. We only want to add backrefs + * that don't have a corresponding extent item in the + * extent tree since they likely belong to this record + * and we need to fix it if it doesn't match bytenrs. + */ + if (tmp->found_rec) + continue; + } + + dback->found_ref += 1; + dback->disk_bytenr = bytenr; + dback->bytes = bytes; + + /* + * Set this so the verify backref code knows not to trust the + * values in this backref. + */ + back->broken = 1; + } + + return 0; +} + +/* + * Record orphan data ref into corresponding root. + * + * Return 0 if the extent item contains data ref and recorded. + * Return 1 if the extent item contains no useful data ref + * On that case, it may contains only shared_dataref or metadata backref + * or the file extent exists(this should be handled by the extent bytenr + * recovery routine) + * Return <0 if something goes wrong. + */ +static int record_orphan_data_extents(struct btrfs_fs_info *fs_info, + struct extent_record *rec) +{ + struct btrfs_key key; + struct btrfs_root *dest_root; + struct extent_backref *back, *tmp; + struct data_backref *dback; + struct orphan_data_extent *orphan; + struct btrfs_path path; + int recorded_data_ref = 0; + int ret = 0; + + if (rec->metadata) + return 1; + btrfs_init_path(&path); + rbtree_postorder_for_each_entry_safe(back, tmp, + &rec->backref_tree, node) { + if (back->full_backref || !back->is_data || + !back->found_extent_tree) + continue; + dback = to_data_backref(back); + if (dback->found_ref) + continue; + key.objectid = dback->root; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + + dest_root = btrfs_read_fs_root(fs_info, &key); + + /* For non-exist root we just skip it */ + if (IS_ERR(dest_root) || !dest_root) + continue; + + key.objectid = dback->owner; + key.type = BTRFS_EXTENT_DATA_KEY; + key.offset = dback->offset; + + ret = btrfs_search_slot(NULL, dest_root, &key, &path, 0, 0); + btrfs_release_path(&path); + /* + * For ret < 0, it's OK since the fs-tree may be corrupted, + * we need to record it for inode/file extent rebuild. + * For ret > 0, we record it only for file extent rebuild. + * For ret == 0, the file extent exists but only bytenr + * mismatch, let the original bytenr fix routine to handle, + * don't record it. + */ + if (ret == 0) + continue; + ret = 0; + orphan = malloc(sizeof(*orphan)); + if (!orphan) { + ret = -ENOMEM; + goto out; + } + INIT_LIST_HEAD(&orphan->list); + orphan->root = dback->root; + orphan->objectid = dback->owner; + orphan->offset = dback->offset; + orphan->disk_bytenr = rec->cache.start; + orphan->disk_len = rec->cache.size; + list_add(&dest_root->orphan_data_extents, &orphan->list); + recorded_data_ref = 1; + } +out: + btrfs_release_path(&path); + if (!ret) + return !recorded_data_ref; + else + return ret; +} + +/* + * when an incorrect extent item is found, this will delete + * all of the existing entries for it and recreate them + * based on what the tree scan found. + */ +static int fixup_extent_refs(struct btrfs_fs_info *info, + struct cache_tree *extent_cache, + struct extent_record *rec) +{ + struct btrfs_trans_handle *trans = NULL; + int ret; + struct btrfs_path path; + struct cache_extent *cache; + struct extent_backref *back, *tmp; + int allocated = 0; + u64 flags = 0; + + if (rec->flag_block_full_backref) + flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; + + btrfs_init_path(&path); + if (rec->refs != rec->extent_item_refs && !rec->metadata) { + /* + * Sometimes the backrefs themselves are so broken they don't + * get attached to any meaningful rec, so first go back and + * check any of our backrefs that we couldn't find and throw + * them into the list if we find the backref so that + * verify_backrefs can figure out what to do. + */ + ret = find_possible_backrefs(info, &path, extent_cache, rec); + if (ret < 0) + goto out; + } + + /* step one, make sure all of the backrefs agree */ + ret = verify_backrefs(info, &path, rec); + if (ret < 0) + goto out; + + trans = btrfs_start_transaction(info->extent_root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } + + /* step two, delete all the existing records */ + ret = delete_extent_records(trans, info->extent_root, &path, + rec->start); + + if (ret < 0) + goto out; + + /* was this block corrupt? If so, don't add references to it */ + cache = lookup_cache_extent(info->corrupt_blocks, + rec->start, rec->max_size); + if (cache) { + ret = 0; + goto out; + } + + /* step three, recreate all the refs we did find */ + rbtree_postorder_for_each_entry_safe(back, tmp, + &rec->backref_tree, node) { + /* + * if we didn't find any references, don't create a + * new extent record + */ + if (!back->found_ref) + continue; + + rec->bad_full_backref = 0; + ret = record_extent(trans, info, &path, rec, back, allocated, + flags); + allocated = 1; + + if (ret) + goto out; + } +out: + if (trans) { + int err = btrfs_commit_transaction(trans, info->extent_root); + + if (!ret) + ret = err; + } + + if (!ret) + fprintf(stderr, "Repaired extent references for %llu\n", + (unsigned long long)rec->start); + + btrfs_release_path(&path); + return ret; +} + +static int fixup_extent_flags(struct btrfs_fs_info *fs_info, + struct extent_record *rec) +{ + struct btrfs_trans_handle *trans; + struct btrfs_root *root = fs_info->extent_root; + struct btrfs_path path; + struct btrfs_extent_item *ei; + struct btrfs_key key; + u64 flags; + int ret = 0; + + key.objectid = rec->start; + if (rec->metadata) { + key.type = BTRFS_METADATA_ITEM_KEY; + key.offset = rec->info_level; + } else { + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = rec->max_size; + } + + trans = btrfs_start_transaction(root, 0); + if (IS_ERR(trans)) + return PTR_ERR(trans); + + btrfs_init_path(&path); + ret = btrfs_search_slot(trans, root, &key, &path, 0, 1); + if (ret < 0) { + btrfs_release_path(&path); + btrfs_commit_transaction(trans, root); + return ret; + } else if (ret) { + fprintf(stderr, "Didn't find extent for %llu\n", + (unsigned long long)rec->start); + btrfs_release_path(&path); + btrfs_commit_transaction(trans, root); + return -ENOENT; + } + + ei = btrfs_item_ptr(path.nodes[0], path.slots[0], + struct btrfs_extent_item); + flags = btrfs_extent_flags(path.nodes[0], ei); + if (rec->flag_block_full_backref) { + fprintf(stderr, "setting full backref on %llu\n", + (unsigned long long)key.objectid); + flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF; + } else { + fprintf(stderr, "clearing full backref on %llu\n", + (unsigned long long)key.objectid); + flags &= ~BTRFS_BLOCK_FLAG_FULL_BACKREF; + } + btrfs_set_extent_flags(path.nodes[0], ei, flags); + btrfs_mark_buffer_dirty(path.nodes[0]); + btrfs_release_path(&path); + ret = btrfs_commit_transaction(trans, root); + if (!ret) + fprintf(stderr, "Repaired extent flags for %llu\n", + (unsigned long long)rec->start); + + return ret; +} + +/* right now we only prune from the extent allocation tree */ +static int prune_one_block(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *info, + struct btrfs_corrupt_block *corrupt) +{ + int ret; + struct btrfs_path path; + struct extent_buffer *eb; + u64 found; + int slot; + int nritems; + int level = corrupt->level + 1; + + btrfs_init_path(&path); +again: + /* we want to stop at the parent to our busted block */ + path.lowest_level = level; + + ret = btrfs_search_slot(trans, info->extent_root, + &corrupt->key, &path, -1, 1); + + if (ret < 0) + goto out; + + eb = path.nodes[level]; + if (!eb) { + ret = -ENOENT; + goto out; + } + + /* + * hopefully the search gave us the block we want to prune, + * lets try that first + */ + slot = path.slots[level]; + found = btrfs_node_blockptr(eb, slot); + if (found == corrupt->cache.start) + goto del_ptr; + + nritems = btrfs_header_nritems(eb); + + /* the search failed, lets scan this node and hope we find it */ + for (slot = 0; slot < nritems; slot++) { + found = btrfs_node_blockptr(eb, slot); + if (found == corrupt->cache.start) + goto del_ptr; + } + /* + * We couldn't find the bad block. + * TODO: search all the nodes for pointers to this block + */ + if (eb == info->extent_root->node) { + ret = -ENOENT; + goto out; + } else { + level++; + btrfs_release_path(&path); + goto again; + } + +del_ptr: + printk("deleting pointer to block %llu\n", corrupt->cache.start); + ret = btrfs_del_ptr(info->extent_root, &path, level, slot); + +out: + btrfs_release_path(&path); + return ret; +} + +static int prune_corrupt_blocks(struct btrfs_fs_info *info) +{ + struct btrfs_trans_handle *trans = NULL; + struct cache_extent *cache; + struct btrfs_corrupt_block *corrupt; + + while (1) { + cache = search_cache_extent(info->corrupt_blocks, 0); + if (!cache) + break; + if (!trans) { + trans = btrfs_start_transaction(info->extent_root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); + } + corrupt = container_of(cache, struct btrfs_corrupt_block, cache); + prune_one_block(trans, info, corrupt); + remove_cache_extent(info->corrupt_blocks, cache); + } + if (trans) + return btrfs_commit_transaction(trans, info->extent_root); + return 0; +} + +static int check_extent_refs(struct btrfs_root *root, + struct cache_tree *extent_cache) +{ + struct extent_record *rec; + struct cache_extent *cache; + int ret = 0; + int had_dups = 0; + int err = 0; + + if (repair) { + /* + * if we're doing a repair, we have to make sure + * we don't allocate from the problem extents. + * In the worst case, this will be all the + * extents in the FS + */ + cache = search_cache_extent(extent_cache, 0); + while (cache) { + rec = container_of(cache, struct extent_record, cache); + set_extent_dirty(root->fs_info->excluded_extents, + rec->start, + rec->start + rec->max_size - 1); + cache = next_cache_extent(cache); + } + + /* pin down all the corrupted blocks too */ + cache = search_cache_extent(root->fs_info->corrupt_blocks, 0); + while (cache) { + set_extent_dirty(root->fs_info->excluded_extents, + cache->start, + cache->start + cache->size - 1); + cache = next_cache_extent(cache); + } + prune_corrupt_blocks(root->fs_info); + reset_cached_block_groups(root->fs_info); + } + + reset_cached_block_groups(root->fs_info); + + /* + * We need to delete any duplicate entries we find first otherwise we + * could mess up the extent tree when we have backrefs that actually + * belong to a different extent item and not the weird duplicate one. + */ + while (repair && !list_empty(&duplicate_extents)) { + rec = to_extent_record(duplicate_extents.next); + list_del_init(&rec->list); + + /* Sometimes we can find a backref before we find an actual + * extent, so we need to process it a little bit to see if there + * truly are multiple EXTENT_ITEM_KEY's for the same range, or + * if this is a backref screwup. If we need to delete stuff + * process_duplicates() will return 0, otherwise it will return + * 1 and we + */ + if (process_duplicates(extent_cache, rec)) + continue; + ret = delete_duplicate_records(root, rec); + if (ret < 0) + return ret; + /* + * delete_duplicate_records will return the number of entries + * deleted, so if it's greater than 0 then we know we actually + * did something and we need to remove. + */ + if (ret) + had_dups = 1; + } + + if (had_dups) + return -EAGAIN; + + while (1) { + int cur_err = 0; + int fix = 0; + + cache = search_cache_extent(extent_cache, 0); + if (!cache) + break; + rec = container_of(cache, struct extent_record, cache); + if (rec->num_duplicates) { + fprintf(stderr, + "extent item %llu has multiple extent items\n", + (unsigned long long)rec->start); + cur_err = 1; + } + + if (rec->refs != rec->extent_item_refs) { + fprintf(stderr, "ref mismatch on [%llu %llu] ", + (unsigned long long)rec->start, + (unsigned long long)rec->nr); + fprintf(stderr, "extent item %llu, found %llu\n", + (unsigned long long)rec->extent_item_refs, + (unsigned long long)rec->refs); + ret = record_orphan_data_extents(root->fs_info, rec); + if (ret < 0) + goto repair_abort; + fix = ret; + cur_err = 1; + } + if (all_backpointers_checked(rec, 1)) { + fprintf(stderr, "backpointer mismatch on [%llu %llu]\n", + (unsigned long long)rec->start, + (unsigned long long)rec->nr); + fix = 1; + cur_err = 1; + } + if (!rec->owner_ref_checked) { + fprintf(stderr, "owner ref check failed [%llu %llu]\n", + (unsigned long long)rec->start, + (unsigned long long)rec->nr); + fix = 1; + cur_err = 1; + } + + if (repair && fix) { + ret = fixup_extent_refs(root->fs_info, extent_cache, + rec); + if (ret) + goto repair_abort; + } + + + if (rec->bad_full_backref) { + fprintf(stderr, "bad full backref, on [%llu]\n", + (unsigned long long)rec->start); + if (repair) { + ret = fixup_extent_flags(root->fs_info, rec); + if (ret) + goto repair_abort; + fix = 1; + } + cur_err = 1; + } + /* + * Although it's not a extent ref's problem, we reuse this + * routine for error reporting. + * No repair function yet. + */ + if (rec->crossing_stripes) { + fprintf(stderr, + "bad metadata [%llu, %llu) crossing stripe boundary\n", + rec->start, rec->start + rec->max_size); + cur_err = 1; + } + + if (rec->wrong_chunk_type) { + fprintf(stderr, + "bad extent [%llu, %llu), type mismatch with chunk\n", + rec->start, rec->start + rec->max_size); + cur_err = 1; + } + + err = cur_err; + remove_cache_extent(extent_cache, cache); + free_all_extent_backrefs(rec); + if (!init_extent_tree && repair && (!cur_err || fix)) + clear_extent_dirty(root->fs_info->excluded_extents, + rec->start, + rec->start + rec->max_size - 1); + free(rec); + } +repair_abort: + if (repair) { + if (ret && ret != -EAGAIN) { + fprintf(stderr, "failed to repair damaged filesystem, aborting\n"); + exit(1); + } else if (!ret) { + struct btrfs_trans_handle *trans; + + root = root->fs_info->extent_root; + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto repair_abort; + } + + ret = btrfs_fix_block_accounting(trans, root); + if (ret) + goto repair_abort; + ret = btrfs_commit_transaction(trans, root); + if (ret) + goto repair_abort; + } + return ret; + } + + if (err) + err = -EIO; + return err; +} + +u64 calc_stripe_length(u64 type, u64 length, int num_stripes) +{ + u64 stripe_size; + + if (type & BTRFS_BLOCK_GROUP_RAID0) { + stripe_size = length; + stripe_size /= num_stripes; + } else if (type & BTRFS_BLOCK_GROUP_RAID10) { + stripe_size = length * 2; + stripe_size /= num_stripes; + } else if (type & BTRFS_BLOCK_GROUP_RAID5) { + stripe_size = length; + stripe_size /= (num_stripes - 1); + } else if (type & BTRFS_BLOCK_GROUP_RAID6) { + stripe_size = length; + stripe_size /= (num_stripes - 2); + } else { + stripe_size = length; + } + return stripe_size; +} + +/* + * Check the chunk with its block group/dev list ref: + * Return 0 if all refs seems valid. + * Return 1 if part of refs seems valid, need later check for rebuild ref + * like missing block group and needs to search extent tree to rebuild them. + * Return -1 if essential refs are missing and unable to rebuild. + */ +static int check_chunk_refs(struct chunk_record *chunk_rec, + struct block_group_tree *block_group_cache, + struct device_extent_tree *dev_extent_cache, + int silent) +{ + struct cache_extent *block_group_item; + struct block_group_record *block_group_rec; + struct cache_extent *dev_extent_item; + struct device_extent_record *dev_extent_rec; + u64 devid; + u64 offset; + u64 length; + int metadump_v2 = 0; + int i; + int ret = 0; + + block_group_item = lookup_cache_extent(&block_group_cache->tree, + chunk_rec->offset, + chunk_rec->length); + if (block_group_item) { + block_group_rec = container_of(block_group_item, + struct block_group_record, + cache); + if (chunk_rec->length != block_group_rec->offset || + chunk_rec->offset != block_group_rec->objectid || + (!metadump_v2 && + chunk_rec->type_flags != block_group_rec->flags)) { + if (!silent) + fprintf(stderr, + "Chunk[%llu, %u, %llu]: length(%llu), offset(%llu), type(%llu) mismatch with block group[%llu, %u, %llu]: offset(%llu), objectid(%llu), flags(%llu)\n", + chunk_rec->objectid, + chunk_rec->type, + chunk_rec->offset, + chunk_rec->length, + chunk_rec->offset, + chunk_rec->type_flags, + block_group_rec->objectid, + block_group_rec->type, + block_group_rec->offset, + block_group_rec->offset, + block_group_rec->objectid, + block_group_rec->flags); + ret = -1; + } else { + list_del_init(&block_group_rec->list); + chunk_rec->bg_rec = block_group_rec; + } + } else { + if (!silent) + fprintf(stderr, + "Chunk[%llu, %u, %llu]: length(%llu), offset(%llu), type(%llu) is not found in block group\n", + chunk_rec->objectid, + chunk_rec->type, + chunk_rec->offset, + chunk_rec->length, + chunk_rec->offset, + chunk_rec->type_flags); + ret = 1; + } + + if (metadump_v2) + return ret; + + length = calc_stripe_length(chunk_rec->type_flags, chunk_rec->length, + chunk_rec->num_stripes); + for (i = 0; i < chunk_rec->num_stripes; ++i) { + devid = chunk_rec->stripes[i].devid; + offset = chunk_rec->stripes[i].offset; + dev_extent_item = lookup_cache_extent2(&dev_extent_cache->tree, + devid, offset, length); + if (dev_extent_item) { + dev_extent_rec = container_of(dev_extent_item, + struct device_extent_record, + cache); + if (dev_extent_rec->objectid != devid || + dev_extent_rec->offset != offset || + dev_extent_rec->chunk_offset != chunk_rec->offset || + dev_extent_rec->length != length) { + if (!silent) + fprintf(stderr, + "Chunk[%llu, %u, %llu] stripe[%llu, %llu] dismatch dev extent[%llu, %llu, %llu]\n", + chunk_rec->objectid, + chunk_rec->type, + chunk_rec->offset, + chunk_rec->stripes[i].devid, + chunk_rec->stripes[i].offset, + dev_extent_rec->objectid, + dev_extent_rec->offset, + dev_extent_rec->length); + ret = -1; + } else { + list_move(&dev_extent_rec->chunk_list, + &chunk_rec->dextents); + } + } else { + if (!silent) + fprintf(stderr, + "Chunk[%llu, %u, %llu] stripe[%llu, %llu] is not found in dev extent\n", + chunk_rec->objectid, + chunk_rec->type, + chunk_rec->offset, + chunk_rec->stripes[i].devid, + chunk_rec->stripes[i].offset); + ret = -1; + } + } + return ret; +} + +/* check btrfs_chunk -> btrfs_dev_extent / btrfs_block_group_item */ +int check_chunks(struct cache_tree *chunk_cache, + struct block_group_tree *block_group_cache, + struct device_extent_tree *dev_extent_cache, + struct list_head *good, struct list_head *bad, + struct list_head *rebuild, int silent) +{ + struct cache_extent *chunk_item; + struct chunk_record *chunk_rec; + struct block_group_record *bg_rec; + struct device_extent_record *dext_rec; + int err; + int ret = 0; + + chunk_item = first_cache_extent(chunk_cache); + while (chunk_item) { + chunk_rec = container_of(chunk_item, struct chunk_record, + cache); + err = check_chunk_refs(chunk_rec, block_group_cache, + dev_extent_cache, silent); + if (err < 0) + ret = err; + if (err == 0 && good) + list_add_tail(&chunk_rec->list, good); + if (err > 0 && rebuild) + list_add_tail(&chunk_rec->list, rebuild); + if (err < 0 && bad) + list_add_tail(&chunk_rec->list, bad); + chunk_item = next_cache_extent(chunk_item); + } + + list_for_each_entry(bg_rec, &block_group_cache->block_groups, list) { + if (!silent) + fprintf(stderr, + "Block group[%llu, %llu] (flags = %llu) didn't find the relative chunk.\n", + bg_rec->objectid, + bg_rec->offset, + bg_rec->flags); + if (!ret) + ret = 1; + } + + list_for_each_entry(dext_rec, &dev_extent_cache->no_chunk_orphans, + chunk_list) { + if (!silent) + fprintf(stderr, + "Device extent[%llu, %llu, %llu] didn't find the relative chunk.\n", + dext_rec->objectid, + dext_rec->offset, + dext_rec->length); + if (!ret) + ret = 1; + } + return ret; +} + + +static int check_device_used(struct device_record *dev_rec, + struct device_extent_tree *dext_cache) +{ + struct cache_extent *cache; + struct device_extent_record *dev_extent_rec; + u64 total_byte = 0; + + cache = search_cache_extent2(&dext_cache->tree, dev_rec->devid, 0); + while (cache) { + dev_extent_rec = container_of(cache, + struct device_extent_record, + cache); + if (dev_extent_rec->objectid != dev_rec->devid) + break; + + list_del_init(&dev_extent_rec->device_list); + total_byte += dev_extent_rec->length; + cache = next_cache_extent(cache); + } + + if (total_byte != dev_rec->byte_used) { + fprintf(stderr, + "Dev extent's total-byte(%llu) is not equal to byte-used(%llu) in dev[%llu, %u, %llu]\n", + total_byte, dev_rec->byte_used, dev_rec->objectid, + dev_rec->type, dev_rec->offset); + return -1; + } else { + return 0; + } +} + +/* + * Unlike device size alignment check above, some super total_bytes check + * failure can lead to mount failure for newer kernel. + * + * So this function will return the error for a fatal super total_bytes problem. + */ +static bool is_super_size_valid(struct btrfs_fs_info *fs_info) +{ + struct btrfs_device *dev; + struct list_head *dev_list = &fs_info->fs_devices->devices; + u64 total_bytes = 0; + u64 super_bytes = btrfs_super_total_bytes(fs_info->super_copy); + + list_for_each_entry(dev, dev_list, dev_list) + total_bytes += dev->total_bytes; + + /* Important check, which can cause unmountable fs */ + if (super_bytes < total_bytes) { + error("super total bytes %llu smaller than real device(s) size %llu", + super_bytes, total_bytes); + error("mounting this fs may fail for newer kernels"); + error("this can be fixed by 'btrfs rescue fix-device-size'"); + return false; + } + + /* + * Optional check, just to make everything aligned and match with each + * other. + * + * For a btrfs-image restored fs, we don't need to check it anyway. + */ + if (btrfs_super_flags(fs_info->super_copy) & + (BTRFS_SUPER_FLAG_METADUMP | BTRFS_SUPER_FLAG_METADUMP_V2)) + return true; + if (!IS_ALIGNED(super_bytes, fs_info->sectorsize) || + !IS_ALIGNED(total_bytes, fs_info->sectorsize) || + super_bytes != total_bytes) { + warning("minor unaligned/mismatch device size detected"); + warning( + "recommended to use 'btrfs rescue fix-device-size' to fix it"); + } + return true; +} + +/* check btrfs_dev_item -> btrfs_dev_extent */ +static int check_devices(struct rb_root *dev_cache, + struct device_extent_tree *dev_extent_cache) +{ + struct rb_node *dev_node; + struct device_record *dev_rec; + struct device_extent_record *dext_rec; + int err; + int ret = 0; + + dev_node = rb_first(dev_cache); + while (dev_node) { + dev_rec = container_of(dev_node, struct device_record, node); + err = check_device_used(dev_rec, dev_extent_cache); + if (err) + ret = err; + + check_dev_size_alignment(dev_rec->devid, dev_rec->total_byte, + global_info->sectorsize); + dev_node = rb_next(dev_node); + } + list_for_each_entry(dext_rec, &dev_extent_cache->no_device_orphans, + device_list) { + fprintf(stderr, + "Device extent[%llu, %llu, %llu] didn't find its device.\n", + dext_rec->objectid, dext_rec->offset, dext_rec->length); + if (!ret) + ret = 1; + } + return ret; +} + +static int add_root_item_to_list(struct list_head *head, + u64 objectid, u64 bytenr, u64 last_snapshot, + u8 level, u8 drop_level, + struct btrfs_key *drop_key) +{ + struct root_item_record *ri_rec; + + ri_rec = malloc(sizeof(*ri_rec)); + if (!ri_rec) + return -ENOMEM; + ri_rec->bytenr = bytenr; + ri_rec->objectid = objectid; + ri_rec->level = level; + ri_rec->drop_level = drop_level; + ri_rec->last_snapshot = last_snapshot; + if (drop_key) + memcpy(&ri_rec->drop_key, drop_key, sizeof(*drop_key)); + list_add_tail(&ri_rec->list, head); + + return 0; +} + +static void free_root_item_list(struct list_head *list) +{ + struct root_item_record *ri_rec; + + while (!list_empty(list)) { + ri_rec = list_first_entry(list, struct root_item_record, + list); + list_del_init(&ri_rec->list); + free(ri_rec); + } +} + +static int deal_root_from_list(struct list_head *list, + struct btrfs_root *root, + struct block_info *bits, + int bits_nr, + struct cache_tree *pending, + struct cache_tree *seen, + struct cache_tree *reada, + struct cache_tree *nodes, + struct cache_tree *extent_cache, + struct cache_tree *chunk_cache, + struct rb_root *dev_cache, + struct block_group_tree *block_group_cache, + struct device_extent_tree *dev_extent_cache) +{ + int ret = 0; + u64 last; + + while (!list_empty(list)) { + struct root_item_record *rec; + struct extent_buffer *buf; + + rec = list_entry(list->next, + struct root_item_record, list); + last = 0; + buf = read_tree_block(root->fs_info, rec->bytenr, 0); + if (!extent_buffer_uptodate(buf)) { + free_extent_buffer(buf); + ret = -EIO; + break; + } + ret = add_root_to_pending(buf, extent_cache, pending, + seen, nodes, rec->objectid); + if (ret < 0) + break; + /* + * To rebuild extent tree, we need deal with snapshot + * one by one, otherwise we deal with node firstly which + * can maximize readahead. + */ + while (1) { + ret = run_next_block(root, bits, bits_nr, &last, + pending, seen, reada, nodes, + extent_cache, chunk_cache, + dev_cache, block_group_cache, + dev_extent_cache, rec); + if (ret != 0) + break; + } + free_extent_buffer(buf); + list_del(&rec->list); + free(rec); + if (ret < 0) + break; + } + while (ret >= 0) { + ret = run_next_block(root, bits, bits_nr, &last, pending, seen, + reada, nodes, extent_cache, chunk_cache, + dev_cache, block_group_cache, + dev_extent_cache, NULL); + if (ret != 0) { + if (ret > 0) + ret = 0; + break; + } + } + return ret; +} + +static int check_chunks_and_extents(struct btrfs_fs_info *fs_info) +{ + struct rb_root dev_cache; + struct cache_tree chunk_cache; + struct block_group_tree block_group_cache; + struct device_extent_tree dev_extent_cache; + struct cache_tree extent_cache; + struct cache_tree seen; + struct cache_tree pending; + struct cache_tree reada; + struct cache_tree nodes; + struct extent_io_tree excluded_extents; + struct cache_tree corrupt_blocks; + struct btrfs_path path; + struct btrfs_key key; + struct btrfs_key found_key; + int ret, err = 0; + struct block_info *bits; + int bits_nr; + struct extent_buffer *leaf; + int slot; + struct btrfs_root_item ri; + struct list_head dropping_trees; + struct list_head normal_trees; + struct btrfs_root *root1; + struct btrfs_root *root; + u64 objectid; + u8 level; + + root = fs_info->fs_root; + dev_cache = RB_ROOT; + cache_tree_init(&chunk_cache); + block_group_tree_init(&block_group_cache); + device_extent_tree_init(&dev_extent_cache); + + cache_tree_init(&extent_cache); + cache_tree_init(&seen); + cache_tree_init(&pending); + cache_tree_init(&nodes); + cache_tree_init(&reada); + cache_tree_init(&corrupt_blocks); + extent_io_tree_init(&excluded_extents); + INIT_LIST_HEAD(&dropping_trees); + INIT_LIST_HEAD(&normal_trees); + + if (repair) { + fs_info->excluded_extents = &excluded_extents; + fs_info->fsck_extent_cache = &extent_cache; + fs_info->free_extent_hook = free_extent_hook; + fs_info->corrupt_blocks = &corrupt_blocks; + } + + bits_nr = 1024; + bits = malloc(bits_nr * sizeof(struct block_info)); + if (!bits) { + perror("malloc"); + exit(1); + } + + if (ctx.progress_enabled) { + ctx.tp = TASK_EXTENTS; + task_start(ctx.info); + } + +again: + root1 = fs_info->tree_root; + level = btrfs_header_level(root1->node); + ret = add_root_item_to_list(&normal_trees, root1->root_key.objectid, + root1->node->start, 0, level, 0, NULL); + if (ret < 0) + goto out; + root1 = fs_info->chunk_root; + level = btrfs_header_level(root1->node); + ret = add_root_item_to_list(&normal_trees, root1->root_key.objectid, + root1->node->start, 0, level, 0, NULL); + if (ret < 0) + goto out; + btrfs_init_path(&path); + key.offset = 0; + key.objectid = 0; + key.type = BTRFS_ROOT_ITEM_KEY; + ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, &path, 0, 0); + if (ret < 0) + goto out; + while (1) { + leaf = path.nodes[0]; + slot = path.slots[0]; + if (slot >= btrfs_header_nritems(path.nodes[0])) { + ret = btrfs_next_leaf(root, &path); + if (ret != 0) + break; + leaf = path.nodes[0]; + slot = path.slots[0]; + } + btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]); + if (found_key.type == BTRFS_ROOT_ITEM_KEY) { + unsigned long offset; + u64 last_snapshot; + + offset = btrfs_item_ptr_offset(leaf, path.slots[0]); + read_extent_buffer(leaf, &ri, offset, sizeof(ri)); + last_snapshot = btrfs_root_last_snapshot(&ri); + if (btrfs_disk_key_objectid(&ri.drop_progress) == 0) { + level = btrfs_root_level(&ri); + ret = add_root_item_to_list(&normal_trees, + found_key.objectid, + btrfs_root_bytenr(&ri), + last_snapshot, level, + 0, NULL); + if (ret < 0) + goto out; + } else { + level = btrfs_root_level(&ri); + objectid = found_key.objectid; + btrfs_disk_key_to_cpu(&found_key, + &ri.drop_progress); + ret = add_root_item_to_list(&dropping_trees, + objectid, + btrfs_root_bytenr(&ri), + last_snapshot, level, + ri.drop_level, &found_key); + if (ret < 0) + goto out; + } + } + path.slots[0]++; + } + btrfs_release_path(&path); + + /* + * check_block can return -EAGAIN if it fixes something, please keep + * this in mind when dealing with return values from these functions, if + * we get -EAGAIN we want to fall through and restart the loop. + */ + ret = deal_root_from_list(&normal_trees, root, bits, bits_nr, &pending, + &seen, &reada, &nodes, &extent_cache, + &chunk_cache, &dev_cache, &block_group_cache, + &dev_extent_cache); + if (ret < 0) { + if (ret == -EAGAIN) + goto loop; + goto out; + } + ret = deal_root_from_list(&dropping_trees, root, bits, bits_nr, + &pending, &seen, &reada, &nodes, + &extent_cache, &chunk_cache, &dev_cache, + &block_group_cache, &dev_extent_cache); + if (ret < 0) { + if (ret == -EAGAIN) + goto loop; + goto out; + } + + ret = check_chunks(&chunk_cache, &block_group_cache, + &dev_extent_cache, NULL, NULL, NULL, 0); + if (ret) { + if (ret == -EAGAIN) + goto loop; + err = ret; + } + + ret = check_extent_refs(root, &extent_cache); + if (ret < 0) { + if (ret == -EAGAIN) + goto loop; + goto out; + } + + ret = check_devices(&dev_cache, &dev_extent_cache); + if (ret && err) + ret = err; + +out: + task_stop(ctx.info); + if (repair) { + free_corrupt_blocks_tree(fs_info->corrupt_blocks); + extent_io_tree_cleanup(&excluded_extents); + fs_info->fsck_extent_cache = NULL; + fs_info->free_extent_hook = NULL; + fs_info->corrupt_blocks = NULL; + fs_info->excluded_extents = NULL; + } + free(bits); + free_chunk_cache_tree(&chunk_cache); + free_device_cache_tree(&dev_cache); + free_block_group_tree(&block_group_cache); + free_device_extent_tree(&dev_extent_cache); + free_extent_cache_tree(&seen); + free_extent_cache_tree(&pending); + free_extent_cache_tree(&reada); + free_extent_cache_tree(&nodes); + free_root_item_list(&normal_trees); + free_root_item_list(&dropping_trees); + return ret; +loop: + free_corrupt_blocks_tree(fs_info->corrupt_blocks); + free_extent_cache_tree(&seen); + free_extent_cache_tree(&pending); + free_extent_cache_tree(&reada); + free_extent_cache_tree(&nodes); + free_chunk_cache_tree(&chunk_cache); + free_block_group_tree(&block_group_cache); + free_device_cache_tree(&dev_cache); + free_device_extent_tree(&dev_extent_cache); + free_extent_record_cache(&extent_cache); + free_root_item_list(&normal_trees); + free_root_item_list(&dropping_trees); + extent_io_tree_cleanup(&excluded_extents); + goto again; +} + +static int do_check_chunks_and_extents(struct btrfs_fs_info *fs_info) +{ + int ret; + + if (!ctx.progress_enabled) + fprintf(stderr, "checking extents\n"); + if (check_mode == CHECK_MODE_LOWMEM) + ret = check_chunks_and_extents_lowmem(fs_info); + else + ret = check_chunks_and_extents(fs_info); + + /* Also repair device size related problems */ + if (repair && !ret) { + ret = btrfs_fix_device_and_super_size(fs_info); + if (ret > 0) + ret = 0; + } + return ret; +} + +static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans, + struct btrfs_root *root, int overwrite) +{ + struct extent_buffer *c; + struct extent_buffer *old = root->node; + int level; + int ret; + struct btrfs_disk_key disk_key = {0,0,0}; + + level = 0; + + if (overwrite) { + c = old; + extent_buffer_get(c); + goto init; + } + c = btrfs_alloc_free_block(trans, root, + root->fs_info->nodesize, + root->root_key.objectid, + &disk_key, level, 0, 0); + if (IS_ERR(c)) { + c = old; + extent_buffer_get(c); + overwrite = 1; + } +init: + memset_extent_buffer(c, 0, 0, sizeof(struct btrfs_header)); + btrfs_set_header_level(c, level); + btrfs_set_header_bytenr(c, c->start); + btrfs_set_header_generation(c, trans->transid); + btrfs_set_header_backref_rev(c, BTRFS_MIXED_BACKREF_REV); + btrfs_set_header_owner(c, root->root_key.objectid); + + write_extent_buffer(c, root->fs_info->fsid, + btrfs_header_fsid(), BTRFS_FSID_SIZE); + + write_extent_buffer(c, root->fs_info->chunk_tree_uuid, + btrfs_header_chunk_tree_uuid(c), + BTRFS_UUID_SIZE); + + btrfs_mark_buffer_dirty(c); + /* + * this case can happen in the following case: + * + * 1.overwrite previous root. + * + * 2.reinit reloc data root, this is because we skip pin + * down reloc data tree before which means we can allocate + * same block bytenr here. + */ + if (old->start == c->start) { + btrfs_set_root_generation(&root->root_item, + trans->transid); + root->root_item.level = btrfs_header_level(root->node); + ret = btrfs_update_root(trans, root->fs_info->tree_root, + &root->root_key, &root->root_item); + if (ret) { + free_extent_buffer(c); + return ret; + } + } + free_extent_buffer(old); + root->node = c; + add_root_to_dirty_list(root); + return 0; +} + +static int pin_down_tree_blocks(struct btrfs_fs_info *fs_info, + struct extent_buffer *eb, int tree_root) +{ + struct extent_buffer *tmp; + struct btrfs_root_item *ri; + struct btrfs_key key; + u64 bytenr; + int level = btrfs_header_level(eb); + int nritems; + int ret; + int i; + + /* + * If we have pinned this block before, don't pin it again. + * This can not only avoid forever loop with broken filesystem + * but also give us some speedups. + */ + if (test_range_bit(&fs_info->pinned_extents, eb->start, + eb->start + eb->len - 1, EXTENT_DIRTY, 0)) + return 0; + + btrfs_pin_extent(fs_info, eb->start, eb->len); + + nritems = btrfs_header_nritems(eb); + for (i = 0; i < nritems; i++) { + if (level == 0) { + btrfs_item_key_to_cpu(eb, &key, i); + if (key.type != BTRFS_ROOT_ITEM_KEY) + continue; + /* Skip the extent root and reloc roots */ + if (key.objectid == BTRFS_EXTENT_TREE_OBJECTID || + key.objectid == BTRFS_TREE_RELOC_OBJECTID || + key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) + continue; + ri = btrfs_item_ptr(eb, i, struct btrfs_root_item); + bytenr = btrfs_disk_root_bytenr(eb, ri); + + /* + * If at any point we start needing the real root we + * will have to build a stump root for the root we are + * in, but for now this doesn't actually use the root so + * just pass in extent_root. + */ + tmp = read_tree_block(fs_info, bytenr, 0); + if (!extent_buffer_uptodate(tmp)) { + fprintf(stderr, "Error reading root block\n"); + return -EIO; + } + ret = pin_down_tree_blocks(fs_info, tmp, 0); + free_extent_buffer(tmp); + if (ret) + return ret; + } else { + bytenr = btrfs_node_blockptr(eb, i); + + /* If we aren't the tree root don't read the block */ + if (level == 1 && !tree_root) { + btrfs_pin_extent(fs_info, bytenr, + fs_info->nodesize); + continue; + } + + tmp = read_tree_block(fs_info, bytenr, 0); + if (!extent_buffer_uptodate(tmp)) { + fprintf(stderr, "Error reading tree block\n"); + return -EIO; + } + ret = pin_down_tree_blocks(fs_info, tmp, tree_root); + free_extent_buffer(tmp); + if (ret) + return ret; + } + } + + return 0; +} + +static int pin_metadata_blocks(struct btrfs_fs_info *fs_info) +{ + int ret; + + ret = pin_down_tree_blocks(fs_info, fs_info->chunk_root->node, 0); + if (ret) + return ret; + + return pin_down_tree_blocks(fs_info, fs_info->tree_root->node, 1); +} + +static int reset_block_groups(struct btrfs_fs_info *fs_info) +{ + struct btrfs_block_group_cache *cache; + struct btrfs_path path; + struct extent_buffer *leaf; + struct btrfs_chunk *chunk; + struct btrfs_key key; + int ret; + u64 start; + + btrfs_init_path(&path); + key.objectid = 0; + key.type = BTRFS_CHUNK_ITEM_KEY; + key.offset = 0; + ret = btrfs_search_slot(NULL, fs_info->chunk_root, &key, &path, 0, 0); + if (ret < 0) { + btrfs_release_path(&path); + return ret; + } + + /* + * We do this in case the block groups were screwed up and had alloc + * bits that aren't actually set on the chunks. This happens with + * restored images every time and could happen in real life I guess. + */ + fs_info->avail_data_alloc_bits = 0; + fs_info->avail_metadata_alloc_bits = 0; + fs_info->avail_system_alloc_bits = 0; + + /* First we need to create the in-memory block groups */ + while (1) { + if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { + ret = btrfs_next_leaf(fs_info->chunk_root, &path); + if (ret < 0) { + btrfs_release_path(&path); + return ret; + } + if (ret) { + ret = 0; + break; + } + } + leaf = path.nodes[0]; + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.type != BTRFS_CHUNK_ITEM_KEY) { + path.slots[0]++; + continue; + } + + chunk = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_chunk); + btrfs_add_block_group(fs_info, 0, + btrfs_chunk_type(leaf, chunk), key.offset, + btrfs_chunk_length(leaf, chunk)); + set_extent_dirty(&fs_info->free_space_cache, key.offset, + key.offset + btrfs_chunk_length(leaf, chunk)); + path.slots[0]++; + } + start = 0; + while (1) { + cache = btrfs_lookup_first_block_group(fs_info, start); + if (!cache) + break; + cache->cached = 1; + start = cache->key.objectid + cache->key.offset; + } + + btrfs_release_path(&path); + return 0; +} + +static int reset_balance(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info) +{ + struct btrfs_root *root = fs_info->tree_root; + struct btrfs_path path; + struct extent_buffer *leaf; + struct btrfs_key key; + int del_slot, del_nr = 0; + int ret; + int found = 0; + + btrfs_init_path(&path); + key.objectid = BTRFS_BALANCE_OBJECTID; + key.type = BTRFS_BALANCE_ITEM_KEY; + key.offset = 0; + ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); + if (ret) { + if (ret > 0) + ret = 0; + if (!ret) + goto reinit_data_reloc; + else + goto out; + } + + ret = btrfs_del_item(trans, root, &path); + if (ret) + goto out; + btrfs_release_path(&path); + + key.objectid = BTRFS_TREE_RELOC_OBJECTID; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = 0; + ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); + if (ret < 0) + goto out; + while (1) { + if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { + if (!found) + break; + + if (del_nr) { + ret = btrfs_del_items(trans, root, &path, + del_slot, del_nr); + del_nr = 0; + if (ret) + goto out; + } + key.offset++; + btrfs_release_path(&path); + + found = 0; + ret = btrfs_search_slot(trans, root, &key, &path, + -1, 1); + if (ret < 0) + goto out; + continue; + } + found = 1; + leaf = path.nodes[0]; + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.objectid > BTRFS_TREE_RELOC_OBJECTID) + break; + if (key.objectid != BTRFS_TREE_RELOC_OBJECTID) { + path.slots[0]++; + continue; + } + if (!del_nr) { + del_slot = path.slots[0]; + del_nr = 1; + } else { + del_nr++; + } + path.slots[0]++; + } + + if (del_nr) { + ret = btrfs_del_items(trans, root, &path, del_slot, del_nr); + if (ret) + goto out; + } + btrfs_release_path(&path); + +reinit_data_reloc: + key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + root = btrfs_read_fs_root(fs_info, &key); + if (IS_ERR(root)) { + fprintf(stderr, "Error reading data reloc tree\n"); + ret = PTR_ERR(root); + goto out; + } + record_root_in_trans(trans, root); + ret = btrfs_fsck_reinit_root(trans, root, 0); + if (ret) + goto out; + ret = btrfs_make_root_dir(trans, root, BTRFS_FIRST_FREE_OBJECTID); +out: + btrfs_release_path(&path); + return ret; +} + +static int reinit_extent_tree(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info) +{ + u64 start = 0; + int ret; + + /* + * The only reason we don't do this is because right now we're just + * walking the trees we find and pinning down their bytes, we don't look + * at any of the leaves. In order to do mixed groups we'd have to check + * the leaves of any fs roots and pin down the bytes for any file + * extents we find. Not hard but why do it if we don't have to? + */ + if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) { + fprintf(stderr, "We don't support re-initing the extent tree " + "for mixed block groups yet, please notify a btrfs " + "developer you want to do this so they can add this " + "functionality.\n"); + return -EINVAL; + } + + /* + * first we need to walk all of the trees except the extent tree and pin + * down the bytes that are in use so we don't overwrite any existing + * metadata. + */ + ret = pin_metadata_blocks(fs_info); + if (ret) { + fprintf(stderr, "error pinning down used bytes\n"); + return ret; + } + + /* + * Need to drop all the block groups since we're going to recreate all + * of them again. + */ + btrfs_free_block_groups(fs_info); + ret = reset_block_groups(fs_info); + if (ret) { + fprintf(stderr, "error resetting the block groups\n"); + return ret; + } + + /* Ok we can allocate now, reinit the extent root */ + ret = btrfs_fsck_reinit_root(trans, fs_info->extent_root, 0); + if (ret) { + fprintf(stderr, "extent root initialization failed\n"); + /* + * When the transaction code is updated we should end the + * transaction, but for now progs only knows about commit so + * just return an error. + */ + return ret; + } + + /* + * Now we have all the in-memory block groups setup so we can make + * allocations properly, and the metadata we care about is safe since we + * pinned all of it above. + */ + while (1) { + struct btrfs_block_group_cache *cache; + + cache = btrfs_lookup_first_block_group(fs_info, start); + if (!cache) + break; + start = cache->key.objectid + cache->key.offset; + ret = btrfs_insert_item(trans, fs_info->extent_root, + &cache->key, &cache->item, + sizeof(cache->item)); + if (ret) { + fprintf(stderr, "Error adding block group\n"); + return ret; + } + btrfs_extent_post_op(trans, fs_info->extent_root); + } + + ret = reset_balance(trans, fs_info); + if (ret) + fprintf(stderr, "error resetting the pending balance\n"); + + return ret; +} + +static int recow_extent_buffer(struct btrfs_root *root, struct extent_buffer *eb) +{ + struct btrfs_path path; + struct btrfs_trans_handle *trans; + struct btrfs_key key; + int ret; + + printf("Recowing metadata block %llu\n", eb->start); + key.objectid = btrfs_header_owner(eb); + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + + root = btrfs_read_fs_root(root->fs_info, &key); + if (IS_ERR(root)) { + fprintf(stderr, "Couldn't find owner root %llu\n", + key.objectid); + return PTR_ERR(root); + } + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); + + btrfs_init_path(&path); + path.lowest_level = btrfs_header_level(eb); + if (path.lowest_level) + btrfs_node_key_to_cpu(eb, &key, 0); + else + btrfs_item_key_to_cpu(eb, &key, 0); + + ret = btrfs_search_slot(trans, root, &key, &path, 0, 1); + btrfs_commit_transaction(trans, root); + btrfs_release_path(&path); + return ret; +} + +static int delete_bad_item(struct btrfs_root *root, struct bad_item *bad) +{ + struct btrfs_path path; + struct btrfs_trans_handle *trans; + struct btrfs_key key; + int ret; + + printf("Deleting bad item [%llu,%u,%llu]\n", bad->key.objectid, + bad->key.type, bad->key.offset); + key.objectid = bad->root_id; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + + root = btrfs_read_fs_root(root->fs_info, &key); + if (IS_ERR(root)) { + fprintf(stderr, "Couldn't find owner root %llu\n", + key.objectid); + return PTR_ERR(root); + } + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); + + btrfs_init_path(&path); + ret = btrfs_search_slot(trans, root, &bad->key, &path, -1, 1); + if (ret) { + if (ret > 0) + ret = 0; + goto out; + } + ret = btrfs_del_item(trans, root, &path); +out: + btrfs_commit_transaction(trans, root); + btrfs_release_path(&path); + return ret; +} + +static int zero_log_tree(struct btrfs_root *root) +{ + struct btrfs_trans_handle *trans; + int ret; + + trans = btrfs_start_transaction(root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + return ret; + } + btrfs_set_super_log_root(root->fs_info->super_copy, 0); + btrfs_set_super_log_root_level(root->fs_info->super_copy, 0); + ret = btrfs_commit_transaction(trans, root); + return ret; +} + +static int populate_csum(struct btrfs_trans_handle *trans, + struct btrfs_root *csum_root, char *buf, u64 start, + u64 len) +{ + struct btrfs_fs_info *fs_info = csum_root->fs_info; + u64 offset = 0; + u64 sectorsize; + int ret = 0; + + while (offset < len) { + sectorsize = fs_info->sectorsize; + ret = read_extent_data(fs_info, buf, start + offset, + §orsize, 0); + if (ret) + break; + ret = btrfs_csum_file_block(trans, csum_root, start + len, + start + offset, buf, sectorsize); + if (ret) + break; + offset += sectorsize; + } + return ret; +} + +static int fill_csum_tree_from_one_fs_root(struct btrfs_trans_handle *trans, + struct btrfs_root *csum_root, + struct btrfs_root *cur_root) +{ + struct btrfs_path path; + struct btrfs_key key; + struct extent_buffer *node; + struct btrfs_file_extent_item *fi; + char *buf = NULL; + u64 start = 0; + u64 len = 0; + int slot = 0; + int ret = 0; + + buf = malloc(cur_root->fs_info->sectorsize); + if (!buf) + return -ENOMEM; + + btrfs_init_path(&path); + key.objectid = 0; + key.offset = 0; + key.type = 0; + ret = btrfs_search_slot(NULL, cur_root, &key, &path, 0, 0); + if (ret < 0) + goto out; + /* Iterate all regular file extents and fill its csum */ + while (1) { + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + + if (key.type != BTRFS_EXTENT_DATA_KEY) + goto next; + node = path.nodes[0]; + slot = path.slots[0]; + fi = btrfs_item_ptr(node, slot, struct btrfs_file_extent_item); + if (btrfs_file_extent_type(node, fi) != BTRFS_FILE_EXTENT_REG) + goto next; + start = btrfs_file_extent_disk_bytenr(node, fi); + len = btrfs_file_extent_disk_num_bytes(node, fi); + + ret = populate_csum(trans, csum_root, buf, start, len); + if (ret == -EEXIST) + ret = 0; + if (ret < 0) + goto out; +next: + /* + * TODO: if next leaf is corrupted, jump to nearest next valid + * leaf. + */ + ret = btrfs_next_item(cur_root, &path); + if (ret < 0) + goto out; + if (ret > 0) { + ret = 0; + goto out; + } + } + +out: + btrfs_release_path(&path); + free(buf); + return ret; +} + +static int fill_csum_tree_from_fs(struct btrfs_trans_handle *trans, + struct btrfs_root *csum_root) +{ + struct btrfs_fs_info *fs_info = csum_root->fs_info; + struct btrfs_path path; + struct btrfs_root *tree_root = fs_info->tree_root; + struct btrfs_root *cur_root; + struct extent_buffer *node; + struct btrfs_key key; + int slot = 0; + int ret = 0; + + btrfs_init_path(&path); + key.objectid = BTRFS_FS_TREE_OBJECTID; + key.offset = 0; + key.type = BTRFS_ROOT_ITEM_KEY; + ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0); + if (ret < 0) + goto out; + if (ret > 0) { + ret = -ENOENT; + goto out; + } + + while (1) { + node = path.nodes[0]; + slot = path.slots[0]; + btrfs_item_key_to_cpu(node, &key, slot); + if (key.objectid > BTRFS_LAST_FREE_OBJECTID) + goto out; + if (key.type != BTRFS_ROOT_ITEM_KEY) + goto next; + if (!is_fstree(key.objectid)) + goto next; + key.offset = (u64)-1; + + cur_root = btrfs_read_fs_root(fs_info, &key); + if (IS_ERR(cur_root) || !cur_root) { + fprintf(stderr, "Fail to read fs/subvol tree: %lld\n", + key.objectid); + goto out; + } + ret = fill_csum_tree_from_one_fs_root(trans, csum_root, + cur_root); + if (ret < 0) + goto out; +next: + ret = btrfs_next_item(tree_root, &path); + if (ret > 0) { + ret = 0; + goto out; + } + if (ret < 0) + goto out; + } + +out: + btrfs_release_path(&path); + return ret; +} + +static int fill_csum_tree_from_extent(struct btrfs_trans_handle *trans, + struct btrfs_root *csum_root) +{ + struct btrfs_root *extent_root = csum_root->fs_info->extent_root; + struct btrfs_path path; + struct btrfs_extent_item *ei; + struct extent_buffer *leaf; + char *buf; + struct btrfs_key key; + int ret; + + btrfs_init_path(&path); + key.objectid = 0; + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = 0; + ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); + if (ret < 0) { + btrfs_release_path(&path); + return ret; + } + + buf = malloc(csum_root->fs_info->sectorsize); + if (!buf) { + btrfs_release_path(&path); + return -ENOMEM; + } + + while (1) { + if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) { + ret = btrfs_next_leaf(extent_root, &path); + if (ret < 0) + break; + if (ret) { + ret = 0; + break; + } + } + leaf = path.nodes[0]; + + btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); + if (key.type != BTRFS_EXTENT_ITEM_KEY) { + path.slots[0]++; + continue; + } + + ei = btrfs_item_ptr(leaf, path.slots[0], + struct btrfs_extent_item); + if (!(btrfs_extent_flags(leaf, ei) & + BTRFS_EXTENT_FLAG_DATA)) { + path.slots[0]++; + continue; + } + + ret = populate_csum(trans, csum_root, buf, key.objectid, + key.offset); + if (ret) + break; + path.slots[0]++; + } + + btrfs_release_path(&path); + free(buf); + return ret; +} + +/* + * Recalculate the csum and put it into the csum tree. + * + * Extent tree init will wipe out all the extent info, so in that case, we + * can't depend on extent tree, but use fs tree. If search_fs_tree is set, we + * will use fs/subvol trees to init the csum tree. + */ +static int fill_csum_tree(struct btrfs_trans_handle *trans, + struct btrfs_root *csum_root, + int search_fs_tree) +{ + if (search_fs_tree) + return fill_csum_tree_from_fs(trans, csum_root); + else + return fill_csum_tree_from_extent(trans, csum_root); +} + +static void free_roots_info_cache(void) +{ + if (!roots_info_cache) + return; + + while (!cache_tree_empty(roots_info_cache)) { + struct cache_extent *entry; + struct root_item_info *rii; + + entry = first_cache_extent(roots_info_cache); + if (!entry) + break; + remove_cache_extent(roots_info_cache, entry); + rii = container_of(entry, struct root_item_info, cache_extent); + free(rii); + } + + free(roots_info_cache); + roots_info_cache = NULL; +} + +static int build_roots_info_cache(struct btrfs_fs_info *info) +{ + int ret = 0; + struct btrfs_key key; + struct extent_buffer *leaf; + struct btrfs_path path; + + if (!roots_info_cache) { + roots_info_cache = malloc(sizeof(*roots_info_cache)); + if (!roots_info_cache) + return -ENOMEM; + cache_tree_init(roots_info_cache); + } + + btrfs_init_path(&path); + key.objectid = 0; + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = 0; + ret = btrfs_search_slot(NULL, info->extent_root, &key, &path, 0, 0); + if (ret < 0) + goto out; + leaf = path.nodes[0]; + + while (1) { + struct btrfs_key found_key; + struct btrfs_extent_item *ei; + struct btrfs_extent_inline_ref *iref; + unsigned long item_end; + int slot = path.slots[0]; + int type; + u64 flags; + u64 root_id; + u8 level; + struct cache_extent *entry; + struct root_item_info *rii; + + if (slot >= btrfs_header_nritems(leaf)) { + ret = btrfs_next_leaf(info->extent_root, &path); + if (ret < 0) { + break; + } else if (ret) { + ret = 0; + break; + } + leaf = path.nodes[0]; + slot = path.slots[0]; + } + + btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]); + + if (found_key.type != BTRFS_EXTENT_ITEM_KEY && + found_key.type != BTRFS_METADATA_ITEM_KEY) + goto next; + + ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); + flags = btrfs_extent_flags(leaf, ei); + item_end = (unsigned long)ei + btrfs_item_size_nr(leaf, slot); + + if (found_key.type == BTRFS_EXTENT_ITEM_KEY && + !(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) + goto next; + + if (found_key.type == BTRFS_METADATA_ITEM_KEY) { + iref = (struct btrfs_extent_inline_ref *)(ei + 1); + level = found_key.offset; + } else { + struct btrfs_tree_block_info *binfo; + + binfo = (struct btrfs_tree_block_info *)(ei + 1); + iref = (struct btrfs_extent_inline_ref *)(binfo + 1); + level = btrfs_tree_block_level(leaf, binfo); + } + + /* + * It's a valid extent/metadata item that has no inline ref, + * but SHARED_BLOCK_REF or other shared references. + * So we need to do extra check to avoid reading beyond leaf + * boudnary. + */ + if ((unsigned long)iref >= item_end) + goto next; + + /* + * For a root extent, it must be of the following type and the + * first (and only one) iref in the item. + */ + type = btrfs_extent_inline_ref_type(leaf, iref); + if (type != BTRFS_TREE_BLOCK_REF_KEY) + goto next; + + root_id = btrfs_extent_inline_ref_offset(leaf, iref); + entry = lookup_cache_extent(roots_info_cache, root_id, 1); + if (!entry) { + rii = malloc(sizeof(struct root_item_info)); + if (!rii) { + ret = -ENOMEM; + goto out; + } + rii->cache_extent.start = root_id; + rii->cache_extent.size = 1; + rii->level = (u8)-1; + entry = &rii->cache_extent; + ret = insert_cache_extent(roots_info_cache, entry); + ASSERT(ret == 0); + } else { + rii = container_of(entry, struct root_item_info, + cache_extent); + } + + ASSERT(rii->cache_extent.start == root_id); + ASSERT(rii->cache_extent.size == 1); + + if (level > rii->level || rii->level == (u8)-1) { + rii->level = level; + rii->bytenr = found_key.objectid; + rii->gen = btrfs_extent_generation(leaf, ei); + rii->node_count = 1; + } else if (level == rii->level) { + rii->node_count++; + } +next: + path.slots[0]++; + } + +out: + btrfs_release_path(&path); + + return ret; +} + +static int maybe_repair_root_item(struct btrfs_path *path, + const struct btrfs_key *root_key, + const int read_only_mode) +{ + const u64 root_id = root_key->objectid; + struct cache_extent *entry; + struct root_item_info *rii; + struct btrfs_root_item ri; + unsigned long offset; + + entry = lookup_cache_extent(roots_info_cache, root_id, 1); + if (!entry) { + fprintf(stderr, + "Error: could not find extent items for root %llu\n", + root_key->objectid); + return -ENOENT; + } + + rii = container_of(entry, struct root_item_info, cache_extent); + ASSERT(rii->cache_extent.start == root_id); + ASSERT(rii->cache_extent.size == 1); + + if (rii->node_count != 1) { + fprintf(stderr, + "Error: could not find btree root extent for root %llu\n", + root_id); + return -ENOENT; + } + + offset = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); + read_extent_buffer(path->nodes[0], &ri, offset, sizeof(ri)); + + if (btrfs_root_bytenr(&ri) != rii->bytenr || + btrfs_root_level(&ri) != rii->level || + btrfs_root_generation(&ri) != rii->gen) { + + /* + * If we're in repair mode but our caller told us to not update + * the root item, i.e. just check if it needs to be updated, don't + * print this message, since the caller will call us again shortly + * for the same root item without read only mode (the caller will + * open a transaction first). + */ + if (!(read_only_mode && repair)) + fprintf(stderr, + "%sroot item for root %llu," + " current bytenr %llu, current gen %llu, current level %u," + " new bytenr %llu, new gen %llu, new level %u\n", + (read_only_mode ? "" : "fixing "), + root_id, + btrfs_root_bytenr(&ri), btrfs_root_generation(&ri), + btrfs_root_level(&ri), + rii->bytenr, rii->gen, rii->level); + + if (btrfs_root_generation(&ri) > rii->gen) { + fprintf(stderr, + "root %llu has a root item with a more recent gen (%llu) compared to the found root node (%llu)\n", + root_id, btrfs_root_generation(&ri), rii->gen); + return -EINVAL; + } + + if (!read_only_mode) { + btrfs_set_root_bytenr(&ri, rii->bytenr); + btrfs_set_root_level(&ri, rii->level); + btrfs_set_root_generation(&ri, rii->gen); + write_extent_buffer(path->nodes[0], &ri, + offset, sizeof(ri)); + } + + return 1; + } + + return 0; +} + +/* + * A regression introduced in the 3.17 kernel (more specifically in 3.17-rc2), + * caused read-only snapshots to be corrupted if they were created at a moment + * when the source subvolume/snapshot had orphan items. The issue was that the + * on-disk root items became incorrect, referring to the pre orphan cleanup root + * node instead of the post orphan cleanup root node. + * So this function, and its callees, just detects and fixes those cases. Even + * though the regression was for read-only snapshots, this function applies to + * any snapshot/subvolume root. + * This must be run before any other repair code - not doing it so, makes other + * repair code delete or modify backrefs in the extent tree for example, which + * will result in an inconsistent fs after repairing the root items. + */ +static int repair_root_items(struct btrfs_fs_info *info) +{ + struct btrfs_path path; + struct btrfs_key key; + struct extent_buffer *leaf; + struct btrfs_trans_handle *trans = NULL; + int ret = 0; + int bad_roots = 0; + int need_trans = 0; + + btrfs_init_path(&path); + + ret = build_roots_info_cache(info); + if (ret) + goto out; + + key.objectid = BTRFS_FIRST_FREE_OBJECTID; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = 0; + +again: + /* + * Avoid opening and committing transactions if a leaf doesn't have + * any root items that need to be fixed, so that we avoid rotating + * backup roots unnecessarily. + */ + if (need_trans) { + trans = btrfs_start_transaction(info->tree_root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + goto out; + } + } + + ret = btrfs_search_slot(trans, info->tree_root, &key, &path, + 0, trans ? 1 : 0); + if (ret < 0) + goto out; + leaf = path.nodes[0]; + + while (1) { + struct btrfs_key found_key; + + if (path.slots[0] >= btrfs_header_nritems(leaf)) { + int no_more_keys = find_next_key(&path, &key); + + btrfs_release_path(&path); + if (trans) { + ret = btrfs_commit_transaction(trans, + info->tree_root); + trans = NULL; + if (ret < 0) + goto out; + } + need_trans = 0; + if (no_more_keys) + break; + goto again; + } + + btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]); + + if (found_key.type != BTRFS_ROOT_ITEM_KEY) + goto next; + if (found_key.objectid == BTRFS_TREE_RELOC_OBJECTID) + goto next; + + ret = maybe_repair_root_item(&path, &found_key, trans ? 0 : 1); + if (ret < 0) + goto out; + if (ret) { + if (!trans && repair) { + need_trans = 1; + key = found_key; + btrfs_release_path(&path); + goto again; + } + bad_roots++; + } +next: + path.slots[0]++; + } + ret = 0; +out: + free_roots_info_cache(); + btrfs_release_path(&path); + if (trans) + btrfs_commit_transaction(trans, info->tree_root); + if (ret < 0) + return ret; + + return bad_roots; +} + +static int clear_free_space_cache(struct btrfs_fs_info *fs_info) +{ + struct btrfs_trans_handle *trans; + struct btrfs_block_group_cache *bg_cache; + u64 current = 0; + int ret = 0; + + /* Clear all free space cache inodes and its extent data */ + while (1) { + bg_cache = btrfs_lookup_first_block_group(fs_info, current); + if (!bg_cache) + break; + ret = btrfs_clear_free_space_cache(fs_info, bg_cache); + if (ret < 0) + return ret; + current = bg_cache->key.objectid + bg_cache->key.offset; + } + + /* Don't forget to set cache_generation to -1 */ + trans = btrfs_start_transaction(fs_info->tree_root, 0); + if (IS_ERR(trans)) { + error("failed to update super block cache generation"); + return PTR_ERR(trans); + } + btrfs_set_super_cache_generation(fs_info->super_copy, (u64)-1); + btrfs_commit_transaction(trans, fs_info->tree_root); + + return ret; +} + +static int do_clear_free_space_cache(struct btrfs_fs_info *fs_info, + int clear_version) +{ + int ret = 0; + + if (clear_version == 1) { + if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { + error( + "free space cache v2 detected, use --clear-space-cache v2"); + ret = 1; + goto close_out; + } + printf("Clearing free space cache\n"); + ret = clear_free_space_cache(fs_info); + if (ret) { + error("failed to clear free space cache"); + ret = 1; + } else { + printf("Free space cache cleared\n"); + } + } else if (clear_version == 2) { + if (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { + printf("no free space cache v2 to clear\n"); + ret = 0; + goto close_out; + } + printf("Clear free space cache v2\n"); + ret = btrfs_clear_free_space_tree(fs_info); + if (ret) { + error("failed to clear free space cache v2: %d", ret); + ret = 1; + } else { + printf("free space cache v2 cleared\n"); + } + } +close_out: + return ret; +} + +const char * const cmd_check_usage[] = { + "btrfs check [options] <device>", + "Check structural integrity of a filesystem (unmounted).", + "Check structural integrity of an unmounted filesystem. Verify internal", + "trees' consistency and item connectivity. In the repair mode try to", + "fix the problems found. ", + "WARNING: the repair mode is considered dangerous", + "", + "-s|--super <superblock> use this superblock copy", + "-b|--backup use the first valid backup root copy", + "--force skip mount checks, repair is not possible", + "--repair try to repair the filesystem", + "--readonly run in read-only mode (default)", + "--init-csum-tree create a new CRC tree", + "--init-extent-tree create a new extent tree", + "--mode <MODE> allows choice of memory/IO trade-offs", + " where MODE is one of:", + " original - read inodes and extents to memory (requires", + " more memory, does less IO)", + " lowmem - try to use less memory but read blocks again", + " when needed", + "--check-data-csum verify checksums of data blocks", + "-Q|--qgroup-report print a report on qgroup consistency", + "-E|--subvol-extents <subvolid>", + " print subvolume extents and sharing state", + "-r|--tree-root <bytenr> use the given bytenr for the tree root", + "--chunk-root <bytenr> use the given bytenr for the chunk tree root", + "-p|--progress indicate progress", + "--clear-space-cache v1|v2 clear space cache for v1 or v2", + NULL +}; + +int cmd_check(int argc, char **argv) +{ + struct cache_tree root_cache; + struct btrfs_root *root; + struct btrfs_fs_info *info; + u64 bytenr = 0; + u64 subvolid = 0; + u64 tree_root_bytenr = 0; + u64 chunk_root_bytenr = 0; + char uuidbuf[BTRFS_UUID_UNPARSED_SIZE]; + int ret = 0; + int err = 0; + u64 num; + int init_csum_tree = 0; + int readonly = 0; + int clear_space_cache = 0; + int qgroup_report = 0; + int qgroups_repaired = 0; + unsigned ctree_flags = OPEN_CTREE_EXCLUSIVE; + int force = 0; + + while(1) { + int c; + enum { GETOPT_VAL_REPAIR = 257, GETOPT_VAL_INIT_CSUM, + GETOPT_VAL_INIT_EXTENT, GETOPT_VAL_CHECK_CSUM, + GETOPT_VAL_READONLY, GETOPT_VAL_CHUNK_TREE, + GETOPT_VAL_MODE, GETOPT_VAL_CLEAR_SPACE_CACHE, + GETOPT_VAL_FORCE }; + static const struct option long_options[] = { + { "super", required_argument, NULL, 's' }, + { "repair", no_argument, NULL, GETOPT_VAL_REPAIR }, + { "readonly", no_argument, NULL, GETOPT_VAL_READONLY }, + { "init-csum-tree", no_argument, NULL, + GETOPT_VAL_INIT_CSUM }, + { "init-extent-tree", no_argument, NULL, + GETOPT_VAL_INIT_EXTENT }, + { "check-data-csum", no_argument, NULL, + GETOPT_VAL_CHECK_CSUM }, + { "backup", no_argument, NULL, 'b' }, + { "subvol-extents", required_argument, NULL, 'E' }, + { "qgroup-report", no_argument, NULL, 'Q' }, + { "tree-root", required_argument, NULL, 'r' }, + { "chunk-root", required_argument, NULL, + GETOPT_VAL_CHUNK_TREE }, + { "progress", no_argument, NULL, 'p' }, + { "mode", required_argument, NULL, + GETOPT_VAL_MODE }, + { "clear-space-cache", required_argument, NULL, + GETOPT_VAL_CLEAR_SPACE_CACHE}, + { "force", no_argument, NULL, GETOPT_VAL_FORCE }, + { NULL, 0, NULL, 0} + }; + + c = getopt_long(argc, argv, "as:br:pEQ", long_options, NULL); + if (c < 0) + break; + switch(c) { + case 'a': /* ignored */ break; + case 'b': + ctree_flags |= OPEN_CTREE_BACKUP_ROOT; + break; + case 's': + num = arg_strtou64(optarg); + if (num >= BTRFS_SUPER_MIRROR_MAX) { + error( + "super mirror should be less than %d", + BTRFS_SUPER_MIRROR_MAX); + exit(1); + } + bytenr = btrfs_sb_offset(((int)num)); + printf("using SB copy %llu, bytenr %llu\n", num, + (unsigned long long)bytenr); + break; + case 'Q': + qgroup_report = 1; + break; + case 'E': + subvolid = arg_strtou64(optarg); + break; + case 'r': + tree_root_bytenr = arg_strtou64(optarg); + break; + case GETOPT_VAL_CHUNK_TREE: + chunk_root_bytenr = arg_strtou64(optarg); + break; + case 'p': + ctx.progress_enabled = true; + break; + case '?': + case 'h': + usage(cmd_check_usage); + case GETOPT_VAL_REPAIR: + printf("enabling repair mode\n"); + repair = 1; + ctree_flags |= OPEN_CTREE_WRITES; + break; + case GETOPT_VAL_READONLY: + readonly = 1; + break; + case GETOPT_VAL_INIT_CSUM: + printf("Creating a new CRC tree\n"); + init_csum_tree = 1; + repair = 1; + ctree_flags |= OPEN_CTREE_WRITES; + break; + case GETOPT_VAL_INIT_EXTENT: + init_extent_tree = 1; + ctree_flags |= (OPEN_CTREE_WRITES | + OPEN_CTREE_NO_BLOCK_GROUPS); + repair = 1; + break; + case GETOPT_VAL_CHECK_CSUM: + check_data_csum = 1; + break; + case GETOPT_VAL_MODE: + check_mode = parse_check_mode(optarg); + if (check_mode == CHECK_MODE_UNKNOWN) { + error("unknown mode: %s", optarg); + exit(1); + } + break; + case GETOPT_VAL_CLEAR_SPACE_CACHE: + if (strcmp(optarg, "v1") == 0) { + clear_space_cache = 1; + } else if (strcmp(optarg, "v2") == 0) { + clear_space_cache = 2; + ctree_flags |= OPEN_CTREE_INVALIDATE_FST; + } else { + error( + "invalid argument to --clear-space-cache, must be v1 or v2"); + exit(1); + } + ctree_flags |= OPEN_CTREE_WRITES; + break; + case GETOPT_VAL_FORCE: + force = 1; + break; + } + } + + if (check_argc_exact(argc - optind, 1)) + usage(cmd_check_usage); + + if (ctx.progress_enabled) { + ctx.tp = TASK_NOTHING; + ctx.info = task_init(print_status_check, print_status_return, &ctx); + } + + /* This check is the only reason for --readonly to exist */ + if (readonly && repair) { + error("repair options are not compatible with --readonly"); + exit(1); + } + + /* + * experimental and dangerous + */ + if (repair && check_mode == CHECK_MODE_LOWMEM) + warning("low-memory mode repair support is only partial"); + + radix_tree_init(); + cache_tree_init(&root_cache); + + ret = check_mounted(argv[optind]); + if (!force) { + if (ret < 0) { + error("could not check mount status: %s", + strerror(-ret)); + err |= !!ret; + goto err_out; + } else if (ret) { + error( +"%s is currently mounted, use --force if you really intend to check the filesystem", + argv[optind]); + ret = -EBUSY; + err |= !!ret; + goto err_out; + } + } else { + if (repair) { + error("repair and --force is not yet supported"); + ret = 1; + err |= !!ret; + goto err_out; + } + if (ret < 0) { + warning( +"cannot check mount status of %s, the filesystem could be mounted, continuing because of --force", + argv[optind]); + } else if (ret) { + warning( + "filesystem mounted, continuing because of --force"); + } + /* A block device is mounted in exclusive mode by kernel */ + ctree_flags &= ~OPEN_CTREE_EXCLUSIVE; + } + + /* only allow partial opening under repair mode */ + if (repair) + ctree_flags |= OPEN_CTREE_PARTIAL; + + info = open_ctree_fs_info(argv[optind], bytenr, tree_root_bytenr, + chunk_root_bytenr, ctree_flags); + if (!info) { + error("cannot open file system"); + ret = -EIO; + err |= !!ret; + goto err_out; + } + + global_info = info; + root = info->fs_root; + uuid_unparse(info->super_copy->fsid, uuidbuf); + + printf("Checking filesystem on %s\nUUID: %s\n", argv[optind], uuidbuf); + + /* + * Check the bare minimum before starting anything else that could rely + * on it, namely the tree roots, any local consistency checks + */ + if (!extent_buffer_uptodate(info->tree_root->node) || + !extent_buffer_uptodate(info->dev_root->node) || + !extent_buffer_uptodate(info->chunk_root->node)) { + error("critical roots corrupted, unable to check the filesystem"); + err |= !!ret; + ret = -EIO; + goto close_out; + } + + if (clear_space_cache) { + ret = do_clear_free_space_cache(info, clear_space_cache); + err |= !!ret; + goto close_out; + } + + /* + * repair mode will force us to commit transaction which + * will make us fail to load log tree when mounting. + */ + if (repair && btrfs_super_log_root(info->super_copy)) { + ret = ask_user("repair mode will force to clear out log tree, are you sure?"); + if (!ret) { + ret = 1; + err |= !!ret; + goto close_out; + } + ret = zero_log_tree(root); + err |= !!ret; + if (ret) { + error("failed to zero log tree: %d", ret); + goto close_out; + } + } + + if (qgroup_report) { + printf("Print quota groups for %s\nUUID: %s\n", argv[optind], + uuidbuf); + ret = qgroup_verify_all(info); + err |= !!ret; + if (ret == 0) + report_qgroups(1); + goto close_out; + } + if (subvolid) { + printf("Print extent state for subvolume %llu on %s\nUUID: %s\n", + subvolid, argv[optind], uuidbuf); + ret = print_extent_state(info, subvolid); + err |= !!ret; + goto close_out; + } + + if (init_extent_tree || init_csum_tree) { + struct btrfs_trans_handle *trans; + + trans = btrfs_start_transaction(info->extent_root, 0); + if (IS_ERR(trans)) { + error("error starting transaction"); + ret = PTR_ERR(trans); + err |= !!ret; + goto close_out; + } + + if (init_extent_tree) { + printf("Creating a new extent tree\n"); + ret = reinit_extent_tree(trans, info); + err |= !!ret; + if (ret) + goto close_out; + } + + if (init_csum_tree) { + printf("Reinitialize checksum tree\n"); + ret = btrfs_fsck_reinit_root(trans, info->csum_root, 0); + if (ret) { + error("checksum tree initialization failed: %d", + ret); + ret = -EIO; + err |= !!ret; + goto close_out; + } + + ret = fill_csum_tree(trans, info->csum_root, + init_extent_tree); + err |= !!ret; + if (ret) { + error("checksum tree refilling failed: %d", ret); + return -EIO; + } + } + /* + * Ok now we commit and run the normal fsck, which will add + * extent entries for all of the items it finds. + */ + ret = btrfs_commit_transaction(trans, info->extent_root); + err |= !!ret; + if (ret) + goto close_out; + } + if (!extent_buffer_uptodate(info->extent_root->node)) { + error("critical: extent_root, unable to check the filesystem"); + ret = -EIO; + err |= !!ret; + goto close_out; + } + if (!extent_buffer_uptodate(info->csum_root->node)) { + error("critical: csum_root, unable to check the filesystem"); + ret = -EIO; + err |= !!ret; + goto close_out; + } + + if (!init_extent_tree) { + ret = repair_root_items(info); + if (ret < 0) { + err = !!ret; + error("failed to repair root items: %s", strerror(-ret)); + goto close_out; + } + if (repair) { + fprintf(stderr, "Fixed %d roots.\n", ret); + ret = 0; + } else if (ret > 0) { + fprintf(stderr, + "Found %d roots with an outdated root item.\n", + ret); + fprintf(stderr, + "Please run a filesystem check with the option --repair to fix them.\n"); + ret = 1; + err |= ret; + goto close_out; + } + } + + ret = do_check_chunks_and_extents(info); + err |= !!ret; + if (ret) + error( + "errors found in extent allocation tree or chunk allocation"); + + /* Only re-check super size after we checked and repaired the fs */ + err |= !is_super_size_valid(info); + + if (!ctx.progress_enabled) { + if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) + fprintf(stderr, "checking free space tree\n"); + else + fprintf(stderr, "checking free space cache\n"); + } + ret = check_space_cache(root); + err |= !!ret; + if (ret) { + if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) + error("errors found in free space tree"); + else + error("errors found in free space cache"); + goto out; + } + + /* + * We used to have to have these hole extents in between our real + * extents so if we don't have this flag set we need to make sure there + * are no gaps in the file extents for inodes, otherwise we can just + * ignore it when this happens. + */ + no_holes = btrfs_fs_incompat(root->fs_info, NO_HOLES); + ret = do_check_fs_roots(info, &root_cache); + err |= !!ret; + if (ret) { + error("errors found in fs roots"); + goto out; + } + + fprintf(stderr, "checking csums\n"); + ret = check_csums(root); + err |= !!ret; + if (ret) { + error("errors found in csum tree"); + goto out; + } + + fprintf(stderr, "checking root refs\n"); + /* For low memory mode, check_fs_roots_v2 handles root refs */ + if (check_mode != CHECK_MODE_LOWMEM) { + ret = check_root_refs(root, &root_cache); + err |= !!ret; + if (ret) { + error("errors found in root refs"); + goto out; + } + } + + while (repair && !list_empty(&root->fs_info->recow_ebs)) { + struct extent_buffer *eb; + + eb = list_first_entry(&root->fs_info->recow_ebs, + struct extent_buffer, recow); + list_del_init(&eb->recow); + ret = recow_extent_buffer(root, eb); + err |= !!ret; + if (ret) { + error("fails to fix transid errors"); + break; + } + } + + while (!list_empty(&delete_items)) { + struct bad_item *bad; + + bad = list_first_entry(&delete_items, struct bad_item, list); + list_del_init(&bad->list); + if (repair) { + ret = delete_bad_item(root, bad); + err |= !!ret; + } + free(bad); + } + + if (info->quota_enabled) { + fprintf(stderr, "checking quota groups\n"); + ret = qgroup_verify_all(info); + err |= !!ret; + if (ret) { + error("failed to check quota groups"); + goto out; + } + report_qgroups(0); + ret = repair_qgroups(info, &qgroups_repaired); + err |= !!ret; + if (err) { + error("failed to repair quota groups"); + goto out; + } + ret = 0; + } + + if (!list_empty(&root->fs_info->recow_ebs)) { + error("transid errors in file system"); + ret = 1; + err |= !!ret; + } +out: + printf("found %llu bytes used, ", + (unsigned long long)bytes_used); + if (err) + printf("error(s) found\n"); + else + printf("no error found\n"); + printf("total csum bytes: %llu\n",(unsigned long long)total_csum_bytes); + printf("total tree bytes: %llu\n", + (unsigned long long)total_btree_bytes); + printf("total fs tree bytes: %llu\n", + (unsigned long long)total_fs_tree_bytes); + printf("total extent tree bytes: %llu\n", + (unsigned long long)total_extent_tree_bytes); + printf("btree space waste bytes: %llu\n", + (unsigned long long)btree_space_waste); + printf("file data blocks allocated: %llu\n referenced %llu\n", + (unsigned long long)data_bytes_allocated, + (unsigned long long)data_bytes_referenced); + + free_qgroup_counts(); + free_root_recs_tree(&root_cache); +close_out: + close_ctree(root); +err_out: + if (ctx.progress_enabled) + task_deinit(ctx.info); + + return err; +} |