diff options
author | Dimitri John Ledkov <xnox@ubuntu.com> | 2017-02-13 11:24:33 +0000 |
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committer | Dimitri John Ledkov <xnox@ubuntu.com> | 2017-02-13 11:24:33 +0000 |
commit | 4305d024938113df5d73021a09eb2a991f54ca2f (patch) | |
tree | d9e7ecc9db14bcc1394607a9e6c644a8b93e9bea /btrfs-convert.c | |
parent | e693f0e4ffb1776a05b78264ee3d93d5f07efede (diff) |
New upstream release Closes: #849353, #817806, #854915, #845473
Diffstat (limited to 'btrfs-convert.c')
-rw-r--r-- | btrfs-convert.c | 3129 |
1 files changed, 0 insertions, 3129 deletions
diff --git a/btrfs-convert.c b/btrfs-convert.c deleted file mode 100644 index 5175f1f7..00000000 --- a/btrfs-convert.c +++ /dev/null @@ -1,3129 +0,0 @@ -/* - * 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 "kerncompat.h" - -#include <sys/ioctl.h> -#include <sys/mount.h> -#include <stdio.h> -#include <stdlib.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <unistd.h> -#include <uuid/uuid.h> -#include <linux/limits.h> -#include <getopt.h> - -#include "ctree.h" -#include "disk-io.h" -#include "volumes.h" -#include "transaction.h" -#include "crc32c.h" -#include "utils.h" -#include "task-utils.h" - -#if BTRFSCONVERT_EXT2 -#include <ext2fs/ext2_fs.h> -#include <ext2fs/ext2fs.h> -#include <ext2fs/ext2_ext_attr.h> - -#define INO_OFFSET (BTRFS_FIRST_FREE_OBJECTID - EXT2_ROOT_INO) - -/* - * Compatibility code for e2fsprogs 1.41 which doesn't support RO compat flag - * BIGALLOC. - * Unlike normal RO compat flag, BIGALLOC affects how e2fsprogs check used - * space, and btrfs-convert heavily relies on it. - */ -#ifdef HAVE_OLD_E2FSPROGS -#define EXT2FS_CLUSTER_RATIO(fs) (1) -#define EXT2_CLUSTERS_PER_GROUP(s) (EXT2_BLOCKS_PER_GROUP(s)) -#define EXT2FS_B2C(fs, blk) (blk) -#endif - -#endif - -#define CONV_IMAGE_SUBVOL_OBJECTID BTRFS_FIRST_FREE_OBJECTID - -struct task_ctx { - uint32_t max_copy_inodes; - uint32_t cur_copy_inodes; - struct task_info *info; -}; - -static void *print_copied_inodes(void *p) -{ - struct task_ctx *priv = p; - const char work_indicator[] = { '.', 'o', 'O', 'o' }; - uint32_t count = 0; - - task_period_start(priv->info, 1000 /* 1s */); - while (1) { - count++; - printf("copy inodes [%c] [%10d/%10d]\r", - work_indicator[count % 4], priv->cur_copy_inodes, - priv->max_copy_inodes); - fflush(stdout); - task_period_wait(priv->info); - } - - return NULL; -} - -static int after_copied_inodes(void *p) -{ - printf("\n"); - fflush(stdout); - - return 0; -} - -struct btrfs_convert_context; -struct btrfs_convert_operations { - const char *name; - int (*open_fs)(struct btrfs_convert_context *cctx, const char *devname); - int (*read_used_space)(struct btrfs_convert_context *cctx); - int (*copy_inodes)(struct btrfs_convert_context *cctx, - struct btrfs_root *root, int datacsum, - int packing, int noxattr, struct task_ctx *p); - void (*close_fs)(struct btrfs_convert_context *cctx); -}; - -static void init_convert_context(struct btrfs_convert_context *cctx) -{ - cache_tree_init(&cctx->used); - cache_tree_init(&cctx->data_chunks); - cache_tree_init(&cctx->free); -} - -static void clean_convert_context(struct btrfs_convert_context *cctx) -{ - free_extent_cache_tree(&cctx->used); - free_extent_cache_tree(&cctx->data_chunks); - free_extent_cache_tree(&cctx->free); -} - -static inline int copy_inodes(struct btrfs_convert_context *cctx, - struct btrfs_root *root, int datacsum, - int packing, int noxattr, struct task_ctx *p) -{ - return cctx->convert_ops->copy_inodes(cctx, root, datacsum, packing, - noxattr, p); -} - -static inline void convert_close_fs(struct btrfs_convert_context *cctx) -{ - cctx->convert_ops->close_fs(cctx); -} - -static int intersect_with_sb(u64 bytenr, u64 num_bytes) -{ - int i; - u64 offset; - - for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { - offset = btrfs_sb_offset(i); - offset &= ~((u64)BTRFS_STRIPE_LEN - 1); - - if (bytenr < offset + BTRFS_STRIPE_LEN && - bytenr + num_bytes > offset) - return 1; - } - return 0; -} - -static int convert_insert_dirent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - const char *name, size_t name_len, - u64 dir, u64 objectid, - u8 file_type, u64 index_cnt, - struct btrfs_inode_item *inode) -{ - int ret; - u64 inode_size; - struct btrfs_key location = { - .objectid = objectid, - .offset = 0, - .type = BTRFS_INODE_ITEM_KEY, - }; - - ret = btrfs_insert_dir_item(trans, root, name, name_len, - dir, &location, file_type, index_cnt); - if (ret) - return ret; - ret = btrfs_insert_inode_ref(trans, root, name, name_len, - objectid, dir, index_cnt); - if (ret) - return ret; - inode_size = btrfs_stack_inode_size(inode) + name_len * 2; - btrfs_set_stack_inode_size(inode, inode_size); - - return 0; -} - -static int read_disk_extent(struct btrfs_root *root, u64 bytenr, - u32 num_bytes, char *buffer) -{ - int ret; - struct btrfs_fs_devices *fs_devs = root->fs_info->fs_devices; - - ret = pread(fs_devs->latest_bdev, buffer, num_bytes, bytenr); - if (ret != num_bytes) - goto fail; - ret = 0; -fail: - if (ret > 0) - ret = -1; - return ret; -} - -static int csum_disk_extent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - u64 disk_bytenr, u64 num_bytes) -{ - u32 blocksize = root->sectorsize; - u64 offset; - char *buffer; - int ret = 0; - - buffer = malloc(blocksize); - if (!buffer) - return -ENOMEM; - for (offset = 0; offset < num_bytes; offset += blocksize) { - ret = read_disk_extent(root, disk_bytenr + offset, - blocksize, buffer); - if (ret) - break; - ret = btrfs_csum_file_block(trans, - root->fs_info->csum_root, - disk_bytenr + num_bytes, - disk_bytenr + offset, - buffer, blocksize); - if (ret) - break; - } - free(buffer); - return ret; -} - -struct blk_iterate_data { - struct btrfs_trans_handle *trans; - struct btrfs_root *root; - struct btrfs_root *convert_root; - struct btrfs_inode_item *inode; - u64 convert_ino; - u64 objectid; - u64 first_block; - u64 disk_block; - u64 num_blocks; - u64 boundary; - int checksum; - int errcode; -}; - -static void init_blk_iterate_data(struct blk_iterate_data *data, - struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct btrfs_inode_item *inode, - u64 objectid, int checksum) -{ - struct btrfs_key key; - - data->trans = trans; - data->root = root; - data->inode = inode; - data->objectid = objectid; - data->first_block = 0; - data->disk_block = 0; - data->num_blocks = 0; - data->boundary = (u64)-1; - data->checksum = checksum; - data->errcode = 0; - - key.objectid = CONV_IMAGE_SUBVOL_OBJECTID; - key.type = BTRFS_ROOT_ITEM_KEY; - key.offset = (u64)-1; - data->convert_root = btrfs_read_fs_root(root->fs_info, &key); - /* Impossible as we just opened it before */ - BUG_ON(!data->convert_root || IS_ERR(data->convert_root)); - data->convert_ino = BTRFS_FIRST_FREE_OBJECTID + 1; -} - -/* - * Record a file extent in original filesystem into btrfs one. - * The special point is, old disk_block can point to a reserved range. - * So here, we don't use disk_block directly but search convert_root - * to get the real disk_bytenr. - */ -static int record_file_blocks(struct blk_iterate_data *data, - u64 file_block, u64 disk_block, u64 num_blocks) -{ - int ret = 0; - struct btrfs_root *root = data->root; - struct btrfs_root *convert_root = data->convert_root; - struct btrfs_path *path; - u64 file_pos = file_block * root->sectorsize; - u64 old_disk_bytenr = disk_block * root->sectorsize; - u64 num_bytes = num_blocks * root->sectorsize; - u64 cur_off = old_disk_bytenr; - - /* Hole, pass it to record_file_extent directly */ - if (old_disk_bytenr == 0) - return btrfs_record_file_extent(data->trans, root, - data->objectid, data->inode, file_pos, 0, - num_bytes); - - path = btrfs_alloc_path(); - if (!path) - return -ENOMEM; - - /* - * Search real disk bytenr from convert root - */ - while (cur_off < old_disk_bytenr + num_bytes) { - struct btrfs_key key; - struct btrfs_file_extent_item *fi; - struct extent_buffer *node; - int slot; - u64 extent_disk_bytenr; - u64 extent_num_bytes; - u64 real_disk_bytenr; - u64 cur_len; - - key.objectid = data->convert_ino; - key.type = BTRFS_EXTENT_DATA_KEY; - key.offset = cur_off; - - ret = btrfs_search_slot(NULL, convert_root, &key, path, 0, 0); - if (ret < 0) - break; - if (ret > 0) { - ret = btrfs_previous_item(convert_root, path, - data->convert_ino, - BTRFS_EXTENT_DATA_KEY); - if (ret < 0) - break; - if (ret > 0) { - ret = -ENOENT; - break; - } - } - node = path->nodes[0]; - slot = path->slots[0]; - btrfs_item_key_to_cpu(node, &key, slot); - BUG_ON(key.type != BTRFS_EXTENT_DATA_KEY || - key.objectid != data->convert_ino || - key.offset > cur_off); - fi = btrfs_item_ptr(node, slot, struct btrfs_file_extent_item); - extent_disk_bytenr = btrfs_file_extent_disk_bytenr(node, fi); - extent_num_bytes = btrfs_file_extent_disk_num_bytes(node, fi); - BUG_ON(cur_off - key.offset >= extent_num_bytes); - btrfs_release_path(path); - - if (extent_disk_bytenr) - real_disk_bytenr = cur_off - key.offset + - extent_disk_bytenr; - else - real_disk_bytenr = 0; - cur_len = min(key.offset + extent_num_bytes, - old_disk_bytenr + num_bytes) - cur_off; - ret = btrfs_record_file_extent(data->trans, data->root, - data->objectid, data->inode, file_pos, - real_disk_bytenr, cur_len); - if (ret < 0) - break; - cur_off += cur_len; - file_pos += cur_len; - - /* - * No need to care about csum - * As every byte of old fs image is calculated for csum, no - * need to waste CPU cycles now. - */ - } - btrfs_free_path(path); - return ret; -} - -static int block_iterate_proc(u64 disk_block, u64 file_block, - struct blk_iterate_data *idata) -{ - int ret = 0; - int sb_region; - int do_barrier; - struct btrfs_root *root = idata->root; - struct btrfs_block_group_cache *cache; - u64 bytenr = disk_block * root->sectorsize; - - sb_region = intersect_with_sb(bytenr, root->sectorsize); - do_barrier = sb_region || disk_block >= idata->boundary; - if ((idata->num_blocks > 0 && do_barrier) || - (file_block > idata->first_block + idata->num_blocks) || - (disk_block != idata->disk_block + idata->num_blocks)) { - if (idata->num_blocks > 0) { - ret = record_file_blocks(idata, idata->first_block, - idata->disk_block, - idata->num_blocks); - if (ret) - goto fail; - idata->first_block += idata->num_blocks; - idata->num_blocks = 0; - } - if (file_block > idata->first_block) { - ret = record_file_blocks(idata, idata->first_block, - 0, file_block - idata->first_block); - if (ret) - goto fail; - } - - if (sb_region) { - bytenr += BTRFS_STRIPE_LEN - 1; - bytenr &= ~((u64)BTRFS_STRIPE_LEN - 1); - } else { - cache = btrfs_lookup_block_group(root->fs_info, bytenr); - BUG_ON(!cache); - bytenr = cache->key.objectid + cache->key.offset; - } - - idata->first_block = file_block; - idata->disk_block = disk_block; - idata->boundary = bytenr / root->sectorsize; - } - idata->num_blocks++; -fail: - return ret; -} - -static int create_image_file_range(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct cache_tree *used, - struct btrfs_inode_item *inode, - u64 ino, u64 bytenr, u64 *ret_len, - int datacsum) -{ - struct cache_extent *cache; - struct btrfs_block_group_cache *bg_cache; - u64 len = *ret_len; - u64 disk_bytenr; - int i; - int ret; - - BUG_ON(bytenr != round_down(bytenr, root->sectorsize)); - BUG_ON(len != round_down(len, root->sectorsize)); - len = min_t(u64, len, BTRFS_MAX_EXTENT_SIZE); - - /* - * Skip sb ranges first - * [0, 1M), [sb_offset(1), +64K), [sb_offset(2), +64K]. - * - * Or we will insert a hole into current image file, and later - * migrate block will fail as there is already a file extent. - */ - if (bytenr < 1024 * 1024) { - *ret_len = 1024 * 1024 - bytenr; - return 0; - } - for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) { - u64 cur = btrfs_sb_offset(i); - - if (bytenr >= cur && bytenr < cur + BTRFS_STRIPE_LEN) { - *ret_len = cur + BTRFS_STRIPE_LEN - bytenr; - return 0; - } - } - for (i = 1; i < BTRFS_SUPER_MIRROR_MAX; i++) { - u64 cur = btrfs_sb_offset(i); - - /* - * |--reserved--| - * |----range-------| - * May still need to go through file extent inserts - */ - if (bytenr < cur && bytenr + len >= cur) { - len = min_t(u64, len, cur - bytenr); - break; - } - /* - * |--reserved--| - * |---range---| - * Drop out, no need to insert anything - */ - if (bytenr >= cur && bytenr < cur + BTRFS_STRIPE_LEN) { - *ret_len = cur + BTRFS_STRIPE_LEN - bytenr; - return 0; - } - } - - cache = search_cache_extent(used, bytenr); - if (cache) { - if (cache->start <= bytenr) { - /* - * |///////Used///////| - * |<--insert--->| - * bytenr - */ - len = min_t(u64, len, cache->start + cache->size - - bytenr); - disk_bytenr = bytenr; - } else { - /* - * |//Used//| - * |<-insert-->| - * bytenr - */ - len = min(len, cache->start - bytenr); - disk_bytenr = 0; - datacsum = 0; - } - } else { - /* - * |//Used//| |EOF - * |<-insert-->| - * bytenr - */ - disk_bytenr = 0; - datacsum = 0; - } - - if (disk_bytenr) { - /* Check if the range is in a data block group */ - bg_cache = btrfs_lookup_block_group(root->fs_info, bytenr); - if (!bg_cache) - return -ENOENT; - if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_DATA)) - return -EINVAL; - - /* The extent should never cross block group boundary */ - len = min_t(u64, len, bg_cache->key.objectid + - bg_cache->key.offset - bytenr); - } - - BUG_ON(len != round_down(len, root->sectorsize)); - ret = btrfs_record_file_extent(trans, root, ino, inode, bytenr, - disk_bytenr, len); - if (ret < 0) - return ret; - - if (datacsum) - ret = csum_disk_extent(trans, root, bytenr, len); - *ret_len = len; - return ret; -} - -/* - * Relocate old fs data in one reserved ranges - * - * Since all old fs data in reserved range is not covered by any chunk nor - * data extent, we don't need to handle any reference but add new - * extent/reference, which makes codes more clear - */ -static int migrate_one_reserved_range(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct cache_tree *used, - struct btrfs_inode_item *inode, int fd, - u64 ino, u64 start, u64 len, int datacsum) -{ - u64 cur_off = start; - u64 cur_len = len; - u64 hole_start = start; - u64 hole_len; - struct cache_extent *cache; - struct btrfs_key key; - struct extent_buffer *eb; - int ret = 0; - - while (cur_off < start + len) { - cache = lookup_cache_extent(used, cur_off, cur_len); - if (!cache) - break; - cur_off = max(cache->start, cur_off); - cur_len = min(cache->start + cache->size, start + len) - - cur_off; - BUG_ON(cur_len < root->sectorsize); - - /* reserve extent for the data */ - ret = btrfs_reserve_extent(trans, root, cur_len, 0, 0, (u64)-1, - &key, 1); - if (ret < 0) - break; - - eb = malloc(sizeof(*eb) + cur_len); - if (!eb) { - ret = -ENOMEM; - break; - } - - ret = pread(fd, eb->data, cur_len, cur_off); - if (ret < cur_len) { - ret = (ret < 0 ? ret : -EIO); - free(eb); - break; - } - eb->start = key.objectid; - eb->len = key.offset; - - /* Write the data */ - ret = write_and_map_eb(trans, root, eb); - free(eb); - if (ret < 0) - break; - - /* Now handle extent item and file extent things */ - ret = btrfs_record_file_extent(trans, root, ino, inode, cur_off, - key.objectid, key.offset); - if (ret < 0) - break; - /* Finally, insert csum items */ - if (datacsum) - ret = csum_disk_extent(trans, root, key.objectid, - key.offset); - - /* Don't forget to insert hole */ - hole_len = cur_off - hole_start; - if (hole_len) { - ret = btrfs_record_file_extent(trans, root, ino, inode, - hole_start, 0, hole_len); - if (ret < 0) - break; - } - - cur_off += key.offset; - hole_start = cur_off; - cur_len = start + len - cur_off; - } - /* Last hole */ - if (start + len - hole_start > 0) - ret = btrfs_record_file_extent(trans, root, ino, inode, - hole_start, 0, start + len - hole_start); - return ret; -} - -/* - * Relocate the used ext2 data in reserved ranges - * [0,1M) - * [btrfs_sb_offset(1), +BTRFS_STRIPE_LEN) - * [btrfs_sb_offset(2), +BTRFS_STRIPE_LEN) - */ -static int migrate_reserved_ranges(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct cache_tree *used, - struct btrfs_inode_item *inode, int fd, - u64 ino, u64 total_bytes, int datacsum) -{ - u64 cur_off; - u64 cur_len; - int ret = 0; - - /* 0 ~ 1M */ - cur_off = 0; - cur_len = 1024 * 1024; - ret = migrate_one_reserved_range(trans, root, used, inode, fd, ino, - cur_off, cur_len, datacsum); - if (ret < 0) - return ret; - - /* second sb(fisrt sb is included in 0~1M) */ - cur_off = btrfs_sb_offset(1); - cur_len = min(total_bytes, cur_off + BTRFS_STRIPE_LEN) - cur_off; - if (cur_off > total_bytes) - return ret; - ret = migrate_one_reserved_range(trans, root, used, inode, fd, ino, - cur_off, cur_len, datacsum); - if (ret < 0) - return ret; - - /* Last sb */ - cur_off = btrfs_sb_offset(2); - cur_len = min(total_bytes, cur_off + BTRFS_STRIPE_LEN) - cur_off; - if (cur_off > total_bytes) - return ret; - ret = migrate_one_reserved_range(trans, root, used, inode, fd, ino, - cur_off, cur_len, datacsum); - return ret; -} - -/* - * Helper for expand and merge extent_cache for wipe_one_reserved_range() to - * handle wiping a range that exists in cache. - */ -static int _expand_extent_cache(struct cache_tree *tree, - struct cache_extent *entry, - u64 min_stripe_size, int backward) -{ - struct cache_extent *ce; - int diff; - - if (entry->size >= min_stripe_size) - return 0; - diff = min_stripe_size - entry->size; - - if (backward) { - ce = prev_cache_extent(entry); - if (!ce) - goto expand_back; - if (ce->start + ce->size >= entry->start - diff) { - /* Directly merge with previous extent */ - ce->size = entry->start + entry->size - ce->start; - remove_cache_extent(tree, entry); - free(entry); - return 0; - } -expand_back: - /* No overlap, normal extent */ - if (entry->start < diff) { - error("cannot find space for data chunk layout"); - return -ENOSPC; - } - entry->start -= diff; - entry->size += diff; - return 0; - } - ce = next_cache_extent(entry); - if (!ce) - goto expand_after; - if (entry->start + entry->size + diff >= ce->start) { - /* Directly merge with next extent */ - entry->size = ce->start + ce->size - entry->start; - remove_cache_extent(tree, ce); - free(ce); - return 0; - } -expand_after: - entry->size += diff; - return 0; -} - -/* - * Remove one reserve range from given cache tree - * if min_stripe_size is non-zero, it will ensure for split case, - * all its split cache extent is no smaller than @min_strip_size / 2. - */ -static int wipe_one_reserved_range(struct cache_tree *tree, - u64 start, u64 len, u64 min_stripe_size, - int ensure_size) -{ - struct cache_extent *cache; - int ret; - - BUG_ON(ensure_size && min_stripe_size == 0); - /* - * The logical here is simplified to handle special cases only - * So we don't need to consider merge case for ensure_size - */ - BUG_ON(min_stripe_size && (min_stripe_size < len * 2 || - min_stripe_size / 2 < BTRFS_STRIPE_LEN)); - - /* Also, wipe range should already be aligned */ - BUG_ON(start != round_down(start, BTRFS_STRIPE_LEN) || - start + len != round_up(start + len, BTRFS_STRIPE_LEN)); - - min_stripe_size /= 2; - - cache = lookup_cache_extent(tree, start, len); - if (!cache) - return 0; - - if (start <= cache->start) { - /* - * |--------cache---------| - * |-wipe-| - */ - BUG_ON(start + len <= cache->start); - - /* - * The wipe size is smaller than min_stripe_size / 2, - * so the result length should still meet min_stripe_size - * And no need to do alignment - */ - cache->size -= (start + len - cache->start); - if (cache->size == 0) { - remove_cache_extent(tree, cache); - free(cache); - return 0; - } - - BUG_ON(ensure_size && cache->size < min_stripe_size); - - cache->start = start + len; - return 0; - } else if (start > cache->start && start + len < cache->start + - cache->size) { - /* - * |-------cache-----| - * |-wipe-| - */ - u64 old_start = cache->start; - u64 old_len = cache->size; - u64 insert_start = start + len; - u64 insert_len; - - cache->size = start - cache->start; - /* Expand the leading half part if needed */ - if (ensure_size && cache->size < min_stripe_size) { - ret = _expand_extent_cache(tree, cache, - min_stripe_size, 1); - if (ret < 0) - return ret; - } - - /* And insert the new one */ - insert_len = old_start + old_len - start - len; - ret = add_merge_cache_extent(tree, insert_start, insert_len); - if (ret < 0) - return ret; - - /* Expand the last half part if needed */ - if (ensure_size && insert_len < min_stripe_size) { - cache = lookup_cache_extent(tree, insert_start, - insert_len); - if (!cache || cache->start != insert_start || - cache->size != insert_len) - return -ENOENT; - ret = _expand_extent_cache(tree, cache, - min_stripe_size, 0); - } - - return ret; - } - /* - * |----cache-----| - * |--wipe-| - * Wipe len should be small enough and no need to expand the - * remaining extent - */ - cache->size = start - cache->start; - BUG_ON(ensure_size && cache->size < min_stripe_size); - return 0; -} - -/* - * Remove reserved ranges from given cache_tree - * - * It will remove the following ranges - * 1) 0~1M - * 2) 2nd superblock, +64K (make sure chunks are 64K aligned) - * 3) 3rd superblock, +64K - * - * @min_stripe must be given for safety check - * and if @ensure_size is given, it will ensure affected cache_extent will be - * larger than min_stripe_size - */ -static int wipe_reserved_ranges(struct cache_tree *tree, u64 min_stripe_size, - int ensure_size) -{ - int ret; - - ret = wipe_one_reserved_range(tree, 0, 1024 * 1024, min_stripe_size, - ensure_size); - if (ret < 0) - return ret; - ret = wipe_one_reserved_range(tree, btrfs_sb_offset(1), - BTRFS_STRIPE_LEN, min_stripe_size, ensure_size); - if (ret < 0) - return ret; - ret = wipe_one_reserved_range(tree, btrfs_sb_offset(2), - BTRFS_STRIPE_LEN, min_stripe_size, ensure_size); - return ret; -} - -static int calculate_available_space(struct btrfs_convert_context *cctx) -{ - struct cache_tree *used = &cctx->used; - struct cache_tree *data_chunks = &cctx->data_chunks; - struct cache_tree *free = &cctx->free; - struct cache_extent *cache; - u64 cur_off = 0; - /* - * Twice the minimal chunk size, to allow later wipe_reserved_ranges() - * works without need to consider overlap - */ - u64 min_stripe_size = 2 * 16 * 1024 * 1024; - int ret; - - /* Calculate data_chunks */ - for (cache = first_cache_extent(used); cache; - cache = next_cache_extent(cache)) { - u64 cur_len; - - if (cache->start + cache->size < cur_off) - continue; - if (cache->start > cur_off + min_stripe_size) - cur_off = cache->start; - cur_len = max(cache->start + cache->size - cur_off, - min_stripe_size); - ret = add_merge_cache_extent(data_chunks, cur_off, cur_len); - if (ret < 0) - goto out; - cur_off += cur_len; - } - /* - * remove reserved ranges, so we won't ever bother relocating an old - * filesystem extent to other place. - */ - ret = wipe_reserved_ranges(data_chunks, min_stripe_size, 1); - if (ret < 0) - goto out; - - cur_off = 0; - /* - * Calculate free space - * Always round up the start bytenr, to avoid metadata extent corss - * stripe boundary, as later mkfs_convert() won't have all the extent - * allocation check - */ - for (cache = first_cache_extent(data_chunks); cache; - cache = next_cache_extent(cache)) { - if (cache->start < cur_off) - continue; - if (cache->start > cur_off) { - u64 insert_start; - u64 len; - - len = cache->start - round_up(cur_off, - BTRFS_STRIPE_LEN); - insert_start = round_up(cur_off, BTRFS_STRIPE_LEN); - - ret = add_merge_cache_extent(free, insert_start, len); - if (ret < 0) - goto out; - } - cur_off = cache->start + cache->size; - } - /* Don't forget the last range */ - if (cctx->total_bytes > cur_off) { - u64 len = cctx->total_bytes - cur_off; - u64 insert_start; - - insert_start = round_up(cur_off, BTRFS_STRIPE_LEN); - - ret = add_merge_cache_extent(free, insert_start, len); - if (ret < 0) - goto out; - } - - /* Remove reserved bytes */ - ret = wipe_reserved_ranges(free, min_stripe_size, 0); -out: - return ret; -} - -/* - * Read used space, and since we have the used space, - * calcuate data_chunks and free for later mkfs - */ -static int convert_read_used_space(struct btrfs_convert_context *cctx) -{ - int ret; - - ret = cctx->convert_ops->read_used_space(cctx); - if (ret) - return ret; - - ret = calculate_available_space(cctx); - return ret; -} - -/* - * Create the fs image file of old filesystem. - * - * This is completely fs independent as we have cctx->used, only - * need to create file extents pointing to all the positions. - */ -static int create_image(struct btrfs_root *root, - struct btrfs_mkfs_config *cfg, - struct btrfs_convert_context *cctx, int fd, - u64 size, char *name, int datacsum) -{ - struct btrfs_inode_item buf; - struct btrfs_trans_handle *trans; - struct btrfs_path *path = NULL; - struct btrfs_key key; - struct cache_extent *cache; - struct cache_tree used_tmp; - u64 cur; - u64 ino; - u64 flags = BTRFS_INODE_READONLY; - int ret; - - if (!datacsum) - flags |= BTRFS_INODE_NODATASUM; - - trans = btrfs_start_transaction(root, 1); - if (!trans) - return -ENOMEM; - - cache_tree_init(&used_tmp); - - ret = btrfs_find_free_objectid(trans, root, BTRFS_FIRST_FREE_OBJECTID, - &ino); - if (ret < 0) - goto out; - ret = btrfs_new_inode(trans, root, ino, 0400 | S_IFREG); - if (ret < 0) - goto out; - ret = btrfs_change_inode_flags(trans, root, ino, flags); - if (ret < 0) - goto out; - ret = btrfs_add_link(trans, root, ino, BTRFS_FIRST_FREE_OBJECTID, name, - strlen(name), BTRFS_FT_REG_FILE, NULL, 1); - if (ret < 0) - goto out; - - path = btrfs_alloc_path(); - if (!path) { - ret = -ENOMEM; - goto out; - } - key.objectid = ino; - key.type = BTRFS_INODE_ITEM_KEY; - key.offset = 0; - - ret = btrfs_search_slot(trans, root, &key, path, 0, 1); - if (ret) { - ret = (ret > 0 ? -ENOENT : ret); - goto out; - } - read_extent_buffer(path->nodes[0], &buf, - btrfs_item_ptr_offset(path->nodes[0], path->slots[0]), - sizeof(buf)); - btrfs_release_path(path); - - /* - * Create a new used space cache, which doesn't contain the reserved - * range - */ - for (cache = first_cache_extent(&cctx->used); cache; - cache = next_cache_extent(cache)) { - ret = add_cache_extent(&used_tmp, cache->start, cache->size); - if (ret < 0) - goto out; - } - ret = wipe_reserved_ranges(&used_tmp, 0, 0); - if (ret < 0) - goto out; - - /* - * Start from 1M, as 0~1M is reserved, and create_image_file_range() - * can't handle bytenr 0(will consider it as a hole) - */ - cur = 1024 * 1024; - while (cur < size) { - u64 len = size - cur; - - ret = create_image_file_range(trans, root, &used_tmp, - &buf, ino, cur, &len, datacsum); - if (ret < 0) - goto out; - cur += len; - } - /* Handle the reserved ranges */ - ret = migrate_reserved_ranges(trans, root, &cctx->used, &buf, fd, ino, - cfg->num_bytes, datacsum); - - - key.objectid = ino; - key.type = BTRFS_INODE_ITEM_KEY; - key.offset = 0; - ret = btrfs_search_slot(trans, root, &key, path, 0, 1); - if (ret) { - ret = (ret > 0 ? -ENOENT : ret); - goto out; - } - btrfs_set_stack_inode_size(&buf, cfg->num_bytes); - write_extent_buffer(path->nodes[0], &buf, - btrfs_item_ptr_offset(path->nodes[0], path->slots[0]), - sizeof(buf)); -out: - free_extent_cache_tree(&used_tmp); - btrfs_free_path(path); - btrfs_commit_transaction(trans, root); - return ret; -} - -static struct btrfs_root* link_subvol(struct btrfs_root *root, - const char *base, u64 root_objectid) -{ - struct btrfs_trans_handle *trans; - struct btrfs_fs_info *fs_info = root->fs_info; - struct btrfs_root *tree_root = fs_info->tree_root; - struct btrfs_root *new_root = NULL; - struct btrfs_path *path; - struct btrfs_inode_item *inode_item; - struct extent_buffer *leaf; - struct btrfs_key key; - u64 dirid = btrfs_root_dirid(&root->root_item); - u64 index = 2; - char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */ - int len; - int i; - int ret; - - len = strlen(base); - if (len == 0 || len > BTRFS_NAME_LEN) - return NULL; - - path = btrfs_alloc_path(); - if (!path) - return NULL; - - key.objectid = dirid; - key.type = BTRFS_DIR_INDEX_KEY; - key.offset = (u64)-1; - - ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); - if (ret <= 0) { - error("search for DIR_INDEX dirid %llu failed: %d", - (unsigned long long)dirid, ret); - goto fail; - } - - if (path->slots[0] > 0) { - path->slots[0]--; - btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); - if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY) - index = key.offset + 1; - } - btrfs_release_path(path); - - trans = btrfs_start_transaction(root, 1); - if (!trans) { - error("unable to start transaction"); - goto fail; - } - - key.objectid = dirid; - key.offset = 0; - key.type = BTRFS_INODE_ITEM_KEY; - - ret = btrfs_lookup_inode(trans, root, path, &key, 1); - if (ret) { - error("search for INODE_ITEM %llu failed: %d", - (unsigned long long)dirid, ret); - goto fail; - } - leaf = path->nodes[0]; - inode_item = btrfs_item_ptr(leaf, path->slots[0], - struct btrfs_inode_item); - - key.objectid = root_objectid; - key.offset = (u64)-1; - key.type = BTRFS_ROOT_ITEM_KEY; - - memcpy(buf, base, len); - for (i = 0; i < 1024; i++) { - ret = btrfs_insert_dir_item(trans, root, buf, len, - dirid, &key, BTRFS_FT_DIR, index); - if (ret != -EEXIST) - break; - len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i); - if (len < 1 || len > BTRFS_NAME_LEN) { - ret = -EINVAL; - break; - } - } - if (ret) - goto fail; - - btrfs_set_inode_size(leaf, inode_item, len * 2 + - btrfs_inode_size(leaf, inode_item)); - btrfs_mark_buffer_dirty(leaf); - btrfs_release_path(path); - - /* add the backref first */ - ret = btrfs_add_root_ref(trans, tree_root, root_objectid, - BTRFS_ROOT_BACKREF_KEY, - root->root_key.objectid, - dirid, index, buf, len); - if (ret) { - error("unable to add root backref for %llu: %d", - root->root_key.objectid, ret); - goto fail; - } - - /* now add the forward ref */ - ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid, - BTRFS_ROOT_REF_KEY, root_objectid, - dirid, index, buf, len); - if (ret) { - error("unable to add root ref for %llu: %d", - root->root_key.objectid, ret); - goto fail; - } - - ret = btrfs_commit_transaction(trans, root); - if (ret) { - error("transaction commit failed: %d", ret); - goto fail; - } - - new_root = btrfs_read_fs_root(fs_info, &key); - if (IS_ERR(new_root)) { - error("unable to fs read root: %lu", PTR_ERR(new_root)); - new_root = NULL; - } -fail: - btrfs_free_path(path); - return new_root; -} - -static int create_subvol(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 root_objectid) -{ - struct extent_buffer *tmp; - struct btrfs_root *new_root; - struct btrfs_key key; - struct btrfs_root_item root_item; - int ret; - - ret = btrfs_copy_root(trans, root, root->node, &tmp, - root_objectid); - if (ret) - return ret; - - memcpy(&root_item, &root->root_item, sizeof(root_item)); - btrfs_set_root_bytenr(&root_item, tmp->start); - btrfs_set_root_level(&root_item, btrfs_header_level(tmp)); - btrfs_set_root_generation(&root_item, trans->transid); - free_extent_buffer(tmp); - - key.objectid = root_objectid; - key.type = BTRFS_ROOT_ITEM_KEY; - key.offset = trans->transid; - ret = btrfs_insert_root(trans, root->fs_info->tree_root, - &key, &root_item); - - key.offset = (u64)-1; - new_root = btrfs_read_fs_root(root->fs_info, &key); - if (!new_root || IS_ERR(new_root)) { - error("unable to fs read root: %lu", PTR_ERR(new_root)); - return PTR_ERR(new_root); - } - - ret = btrfs_make_root_dir(trans, new_root, BTRFS_FIRST_FREE_OBJECTID); - - return ret; -} - -/* - * New make_btrfs() has handle system and meta chunks quite well. - * So only need to add remaining data chunks. - */ -static int make_convert_data_block_groups(struct btrfs_trans_handle *trans, - struct btrfs_fs_info *fs_info, - struct btrfs_mkfs_config *cfg, - struct btrfs_convert_context *cctx) -{ - struct btrfs_root *extent_root = fs_info->extent_root; - struct cache_tree *data_chunks = &cctx->data_chunks; - struct cache_extent *cache; - u64 max_chunk_size; - int ret = 0; - - /* - * Don't create data chunk over 10% of the convert device - * And for single chunk, don't create chunk larger than 1G. - */ - max_chunk_size = cfg->num_bytes / 10; - max_chunk_size = min((u64)(1024 * 1024 * 1024), max_chunk_size); - max_chunk_size = round_down(max_chunk_size, extent_root->sectorsize); - - for (cache = first_cache_extent(data_chunks); cache; - cache = next_cache_extent(cache)) { - u64 cur = cache->start; - - while (cur < cache->start + cache->size) { - u64 len; - u64 cur_backup = cur; - - len = min(max_chunk_size, - cache->start + cache->size - cur); - ret = btrfs_alloc_data_chunk(trans, extent_root, - &cur_backup, len, - BTRFS_BLOCK_GROUP_DATA, 1); - if (ret < 0) - break; - ret = btrfs_make_block_group(trans, extent_root, 0, - BTRFS_BLOCK_GROUP_DATA, - BTRFS_FIRST_CHUNK_TREE_OBJECTID, - cur, len); - if (ret < 0) - break; - cur += len; - } - } - return ret; -} - -/* - * Init the temp btrfs to a operational status. - * - * It will fix the extent usage accounting(XXX: Do we really need?) and - * insert needed data chunks, to ensure all old fs data extents are covered - * by DATA chunks, preventing wrong chunks are allocated. - * - * And also create convert image subvolume and relocation tree. - * (XXX: Not need again?) - * But the convert image subvolume is *NOT* linked to fs tree yet. - */ -static int init_btrfs(struct btrfs_mkfs_config *cfg, struct btrfs_root *root, - struct btrfs_convert_context *cctx, int datacsum, - int packing, int noxattr) -{ - struct btrfs_key location; - struct btrfs_trans_handle *trans; - struct btrfs_fs_info *fs_info = root->fs_info; - int ret; - - /* - * Don't alloc any metadata/system chunk, as we don't want - * any meta/sys chunk allcated before all data chunks are inserted. - * Or we screw up the chunk layout just like the old implement. - */ - fs_info->avoid_sys_chunk_alloc = 1; - fs_info->avoid_meta_chunk_alloc = 1; - trans = btrfs_start_transaction(root, 1); - if (!trans) { - error("unable to start transaction"); - ret = -EINVAL; - goto err; - } - ret = btrfs_fix_block_accounting(trans, root); - if (ret) - goto err; - ret = make_convert_data_block_groups(trans, fs_info, cfg, cctx); - if (ret) - goto err; - ret = btrfs_make_root_dir(trans, fs_info->tree_root, - BTRFS_ROOT_TREE_DIR_OBJECTID); - if (ret) - goto err; - memcpy(&location, &root->root_key, sizeof(location)); - location.offset = (u64)-1; - ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7, - btrfs_super_root_dir(fs_info->super_copy), - &location, BTRFS_FT_DIR, 0); - if (ret) - goto err; - ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7, - location.objectid, - btrfs_super_root_dir(fs_info->super_copy), 0); - if (ret) - goto err; - btrfs_set_root_dirid(&fs_info->fs_root->root_item, - BTRFS_FIRST_FREE_OBJECTID); - - /* subvol for fs image file */ - ret = create_subvol(trans, root, CONV_IMAGE_SUBVOL_OBJECTID); - if (ret < 0) { - error("failed to create subvolume image root: %d", ret); - goto err; - } - /* subvol for data relocation tree */ - ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID); - if (ret < 0) { - error("failed to create DATA_RELOC root: %d", ret); - goto err; - } - - ret = btrfs_commit_transaction(trans, root); - fs_info->avoid_sys_chunk_alloc = 0; - fs_info->avoid_meta_chunk_alloc = 0; -err: - return ret; -} - -/* - * Migrate super block to its default position and zero 0 ~ 16k - */ -static int migrate_super_block(int fd, u64 old_bytenr, u32 sectorsize) -{ - int ret; - struct extent_buffer *buf; - struct btrfs_super_block *super; - u32 len; - u32 bytenr; - - buf = malloc(sizeof(*buf) + sectorsize); - if (!buf) - return -ENOMEM; - - buf->len = sectorsize; - ret = pread(fd, buf->data, sectorsize, old_bytenr); - if (ret != sectorsize) - goto fail; - - super = (struct btrfs_super_block *)buf->data; - BUG_ON(btrfs_super_bytenr(super) != old_bytenr); - btrfs_set_super_bytenr(super, BTRFS_SUPER_INFO_OFFSET); - - csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); - ret = pwrite(fd, buf->data, sectorsize, BTRFS_SUPER_INFO_OFFSET); - if (ret != sectorsize) - goto fail; - - ret = fsync(fd); - if (ret) - goto fail; - - memset(buf->data, 0, sectorsize); - for (bytenr = 0; bytenr < BTRFS_SUPER_INFO_OFFSET; ) { - len = BTRFS_SUPER_INFO_OFFSET - bytenr; - if (len > sectorsize) - len = sectorsize; - ret = pwrite(fd, buf->data, len, bytenr); - if (ret != len) { - fprintf(stderr, "unable to zero fill device\n"); - break; - } - bytenr += len; - } - ret = 0; - fsync(fd); -fail: - free(buf); - if (ret > 0) - ret = -1; - return ret; -} - -static int prepare_system_chunk_sb(struct btrfs_super_block *super) -{ - struct btrfs_chunk *chunk; - struct btrfs_disk_key *key; - u32 sectorsize = btrfs_super_sectorsize(super); - - key = (struct btrfs_disk_key *)(super->sys_chunk_array); - chunk = (struct btrfs_chunk *)(super->sys_chunk_array + - sizeof(struct btrfs_disk_key)); - - btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID); - btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY); - btrfs_set_disk_key_offset(key, 0); - - btrfs_set_stack_chunk_length(chunk, btrfs_super_total_bytes(super)); - btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID); - btrfs_set_stack_chunk_stripe_len(chunk, BTRFS_STRIPE_LEN); - btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM); - btrfs_set_stack_chunk_io_align(chunk, sectorsize); - btrfs_set_stack_chunk_io_width(chunk, sectorsize); - btrfs_set_stack_chunk_sector_size(chunk, sectorsize); - btrfs_set_stack_chunk_num_stripes(chunk, 1); - btrfs_set_stack_chunk_sub_stripes(chunk, 0); - chunk->stripe.devid = super->dev_item.devid; - btrfs_set_stack_stripe_offset(&chunk->stripe, 0); - memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE); - btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk)); - return 0; -} - -#if BTRFSCONVERT_EXT2 - -/* - * Open Ext2fs in readonly mode, read block allocation bitmap and - * inode bitmap into memory. - */ -static int ext2_open_fs(struct btrfs_convert_context *cctx, const char *name) -{ - errcode_t ret; - ext2_filsys ext2_fs; - ext2_ino_t ino; - u32 ro_feature; - - ret = ext2fs_open(name, 0, 0, 0, unix_io_manager, &ext2_fs); - if (ret) { - fprintf(stderr, "ext2fs_open: %s\n", error_message(ret)); - return -1; - } - /* - * We need to know exactly the used space, some RO compat flags like - * BIGALLOC will affect how used space is present. - * So we need manuall check any unsupported RO compat flags - */ - ro_feature = ext2_fs->super->s_feature_ro_compat; - if (ro_feature & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) { - error( -"unsupported RO features detected: %x, abort convert to avoid possible corruption", - ro_feature & ~EXT2_LIB_FEATURE_COMPAT_SUPP); - goto fail; - } - ret = ext2fs_read_inode_bitmap(ext2_fs); - if (ret) { - fprintf(stderr, "ext2fs_read_inode_bitmap: %s\n", - error_message(ret)); - goto fail; - } - ret = ext2fs_read_block_bitmap(ext2_fs); - if (ret) { - fprintf(stderr, "ext2fs_read_block_bitmap: %s\n", - error_message(ret)); - goto fail; - } - /* - * search each block group for a free inode. this set up - * uninit block/inode bitmaps appropriately. - */ - ino = 1; - while (ino <= ext2_fs->super->s_inodes_count) { - ext2_ino_t foo; - ext2fs_new_inode(ext2_fs, ino, 0, NULL, &foo); - ino += EXT2_INODES_PER_GROUP(ext2_fs->super); - } - - if (!(ext2_fs->super->s_feature_incompat & - EXT2_FEATURE_INCOMPAT_FILETYPE)) { - fprintf(stderr, "filetype feature is missing\n"); - goto fail; - } - - cctx->fs_data = ext2_fs; - cctx->blocksize = ext2_fs->blocksize; - cctx->block_count = ext2_fs->super->s_blocks_count; - cctx->total_bytes = ext2_fs->blocksize * ext2_fs->super->s_blocks_count; - cctx->volume_name = strndup(ext2_fs->super->s_volume_name, 16); - cctx->first_data_block = ext2_fs->super->s_first_data_block; - cctx->inodes_count = ext2_fs->super->s_inodes_count; - cctx->free_inodes_count = ext2_fs->super->s_free_inodes_count; - return 0; -fail: - ext2fs_close(ext2_fs); - return -1; -} - -static int __ext2_add_one_block(ext2_filsys fs, char *bitmap, - unsigned long group_nr, struct cache_tree *used) -{ - unsigned long offset; - unsigned i; - int ret = 0; - - offset = fs->super->s_first_data_block; - offset /= EXT2FS_CLUSTER_RATIO(fs); - offset += group_nr * EXT2_CLUSTERS_PER_GROUP(fs->super); - for (i = 0; i < EXT2_CLUSTERS_PER_GROUP(fs->super); i++) { - if (ext2fs_test_bit(i, bitmap)) { - u64 start; - - start = (i + offset) * EXT2FS_CLUSTER_RATIO(fs); - start *= fs->blocksize; - ret = add_merge_cache_extent(used, start, - fs->blocksize); - if (ret < 0) - break; - } - } - return ret; -} - -/* - * Read all used ext2 space into cctx->used cache tree - */ -static int ext2_read_used_space(struct btrfs_convert_context *cctx) -{ - ext2_filsys fs = (ext2_filsys)cctx->fs_data; - blk64_t blk_itr = EXT2FS_B2C(fs, fs->super->s_first_data_block); - struct cache_tree *used_tree = &cctx->used; - char *block_bitmap = NULL; - unsigned long i; - int block_nbytes; - int ret = 0; - - block_nbytes = EXT2_CLUSTERS_PER_GROUP(fs->super) / 8; - /* Shouldn't happen */ - BUG_ON(!fs->block_map); - - block_bitmap = malloc(block_nbytes); - if (!block_bitmap) - return -ENOMEM; - - for (i = 0; i < fs->group_desc_count; i++) { - ret = ext2fs_get_block_bitmap_range(fs->block_map, blk_itr, - block_nbytes * 8, block_bitmap); - if (ret) { - error("fail to get bitmap from ext2, %s", - strerror(-ret)); - break; - } - ret = __ext2_add_one_block(fs, block_bitmap, i, used_tree); - if (ret < 0) { - error("fail to build used space tree, %s", - strerror(-ret)); - break; - } - blk_itr += EXT2_CLUSTERS_PER_GROUP(fs->super); - } - - free(block_bitmap); - return ret; -} - -static void ext2_close_fs(struct btrfs_convert_context *cctx) -{ - if (cctx->volume_name) { - free(cctx->volume_name); - cctx->volume_name = NULL; - } - ext2fs_close(cctx->fs_data); -} - -struct dir_iterate_data { - struct btrfs_trans_handle *trans; - struct btrfs_root *root; - struct btrfs_inode_item *inode; - u64 objectid; - u64 index_cnt; - u64 parent; - int errcode; -}; - -static u8 ext2_filetype_conversion_table[EXT2_FT_MAX] = { - [EXT2_FT_UNKNOWN] = BTRFS_FT_UNKNOWN, - [EXT2_FT_REG_FILE] = BTRFS_FT_REG_FILE, - [EXT2_FT_DIR] = BTRFS_FT_DIR, - [EXT2_FT_CHRDEV] = BTRFS_FT_CHRDEV, - [EXT2_FT_BLKDEV] = BTRFS_FT_BLKDEV, - [EXT2_FT_FIFO] = BTRFS_FT_FIFO, - [EXT2_FT_SOCK] = BTRFS_FT_SOCK, - [EXT2_FT_SYMLINK] = BTRFS_FT_SYMLINK, -}; - -static int ext2_dir_iterate_proc(ext2_ino_t dir, int entry, - struct ext2_dir_entry *dirent, - int offset, int blocksize, - char *buf,void *priv_data) -{ - int ret; - int file_type; - u64 objectid; - char dotdot[] = ".."; - struct dir_iterate_data *idata = (struct dir_iterate_data *)priv_data; - int name_len; - - name_len = dirent->name_len & 0xFF; - - objectid = dirent->inode + INO_OFFSET; - if (!strncmp(dirent->name, dotdot, name_len)) { - if (name_len == 2) { - BUG_ON(idata->parent != 0); - idata->parent = objectid; - } - return 0; - } - if (dirent->inode < EXT2_GOOD_OLD_FIRST_INO) - return 0; - - file_type = dirent->name_len >> 8; - BUG_ON(file_type > EXT2_FT_SYMLINK); - - ret = convert_insert_dirent(idata->trans, idata->root, dirent->name, - name_len, idata->objectid, objectid, - ext2_filetype_conversion_table[file_type], - idata->index_cnt, idata->inode); - if (ret < 0) { - idata->errcode = ret; - return BLOCK_ABORT; - } - - idata->index_cnt++; - return 0; -} - -static int ext2_create_dir_entries(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - struct btrfs_inode_item *btrfs_inode, - ext2_filsys ext2_fs, ext2_ino_t ext2_ino) -{ - int ret; - errcode_t err; - struct dir_iterate_data data = { - .trans = trans, - .root = root, - .inode = btrfs_inode, - .objectid = objectid, - .index_cnt = 2, - .parent = 0, - .errcode = 0, - }; - - err = ext2fs_dir_iterate2(ext2_fs, ext2_ino, 0, NULL, - ext2_dir_iterate_proc, &data); - if (err) - goto error; - ret = data.errcode; - if (ret == 0 && data.parent == objectid) { - ret = btrfs_insert_inode_ref(trans, root, "..", 2, - objectid, objectid, 0); - } - return ret; -error: - fprintf(stderr, "ext2fs_dir_iterate2: %s\n", error_message(err)); - return -1; -} - -static int ext2_block_iterate_proc(ext2_filsys fs, blk_t *blocknr, - e2_blkcnt_t blockcnt, blk_t ref_block, - int ref_offset, void *priv_data) -{ - int ret; - struct blk_iterate_data *idata; - idata = (struct blk_iterate_data *)priv_data; - ret = block_iterate_proc(*blocknr, blockcnt, idata); - if (ret) { - idata->errcode = ret; - return BLOCK_ABORT; - } - return 0; -} - -/* - * traverse file's data blocks, record these data blocks as file extents. - */ -static int ext2_create_file_extents(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - struct btrfs_inode_item *btrfs_inode, - ext2_filsys ext2_fs, ext2_ino_t ext2_ino, - int datacsum, int packing) -{ - int ret; - char *buffer = NULL; - errcode_t err; - u32 last_block; - u32 sectorsize = root->sectorsize; - u64 inode_size = btrfs_stack_inode_size(btrfs_inode); - struct blk_iterate_data data; - - init_blk_iterate_data(&data, trans, root, btrfs_inode, objectid, - datacsum); - - err = ext2fs_block_iterate2(ext2_fs, ext2_ino, BLOCK_FLAG_DATA_ONLY, - NULL, ext2_block_iterate_proc, &data); - if (err) - goto error; - ret = data.errcode; - if (ret) - goto fail; - if (packing && data.first_block == 0 && data.num_blocks > 0 && - inode_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) { - u64 num_bytes = data.num_blocks * sectorsize; - u64 disk_bytenr = data.disk_block * sectorsize; - u64 nbytes; - - buffer = malloc(num_bytes); - if (!buffer) - return -ENOMEM; - ret = read_disk_extent(root, disk_bytenr, num_bytes, buffer); - if (ret) - goto fail; - if (num_bytes > inode_size) - num_bytes = inode_size; - ret = btrfs_insert_inline_extent(trans, root, objectid, - 0, buffer, num_bytes); - if (ret) - goto fail; - nbytes = btrfs_stack_inode_nbytes(btrfs_inode) + num_bytes; - btrfs_set_stack_inode_nbytes(btrfs_inode, nbytes); - } else if (data.num_blocks > 0) { - ret = record_file_blocks(&data, data.first_block, - data.disk_block, data.num_blocks); - if (ret) - goto fail; - } - data.first_block += data.num_blocks; - last_block = (inode_size + sectorsize - 1) / sectorsize; - if (last_block > data.first_block) { - ret = record_file_blocks(&data, data.first_block, 0, - last_block - data.first_block); - } -fail: - free(buffer); - return ret; -error: - fprintf(stderr, "ext2fs_block_iterate2: %s\n", error_message(err)); - return -1; -} - -static int ext2_create_symbol_link(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - struct btrfs_inode_item *btrfs_inode, - ext2_filsys ext2_fs, ext2_ino_t ext2_ino, - struct ext2_inode *ext2_inode) -{ - int ret; - char *pathname; - u64 inode_size = btrfs_stack_inode_size(btrfs_inode); - if (ext2fs_inode_data_blocks(ext2_fs, ext2_inode)) { - btrfs_set_stack_inode_size(btrfs_inode, inode_size + 1); - ret = ext2_create_file_extents(trans, root, objectid, - btrfs_inode, ext2_fs, ext2_ino, 1, 1); - btrfs_set_stack_inode_size(btrfs_inode, inode_size); - return ret; - } - - pathname = (char *)&(ext2_inode->i_block[0]); - BUG_ON(pathname[inode_size] != 0); - ret = btrfs_insert_inline_extent(trans, root, objectid, 0, - pathname, inode_size + 1); - btrfs_set_stack_inode_nbytes(btrfs_inode, inode_size + 1); - return ret; -} - -/* - * Following xattr/acl related codes are based on codes in - * fs/ext3/xattr.c and fs/ext3/acl.c - */ -#define EXT2_XATTR_BHDR(ptr) ((struct ext2_ext_attr_header *)(ptr)) -#define EXT2_XATTR_BFIRST(ptr) \ - ((struct ext2_ext_attr_entry *)(EXT2_XATTR_BHDR(ptr) + 1)) -#define EXT2_XATTR_IHDR(inode) \ - ((struct ext2_ext_attr_header *) ((void *)(inode) + \ - EXT2_GOOD_OLD_INODE_SIZE + (inode)->i_extra_isize)) -#define EXT2_XATTR_IFIRST(inode) \ - ((struct ext2_ext_attr_entry *) ((void *)EXT2_XATTR_IHDR(inode) + \ - sizeof(EXT2_XATTR_IHDR(inode)->h_magic))) - -static int ext2_xattr_check_names(struct ext2_ext_attr_entry *entry, - const void *end) -{ - struct ext2_ext_attr_entry *next; - - while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { - next = EXT2_EXT_ATTR_NEXT(entry); - if ((void *)next >= end) - return -EIO; - entry = next; - } - return 0; -} - -static int ext2_xattr_check_block(const char *buf, size_t size) -{ - int error; - struct ext2_ext_attr_header *header = EXT2_XATTR_BHDR(buf); - - if (header->h_magic != EXT2_EXT_ATTR_MAGIC || - header->h_blocks != 1) - return -EIO; - error = ext2_xattr_check_names(EXT2_XATTR_BFIRST(buf), buf + size); - return error; -} - -static int ext2_xattr_check_entry(struct ext2_ext_attr_entry *entry, - size_t size) -{ - size_t value_size = entry->e_value_size; - - if (entry->e_value_block != 0 || value_size > size || - entry->e_value_offs + value_size > size) - return -EIO; - return 0; -} - -#define EXT2_ACL_VERSION 0x0001 - -/* 23.2.5 acl_tag_t values */ - -#define ACL_UNDEFINED_TAG (0x00) -#define ACL_USER_OBJ (0x01) -#define ACL_USER (0x02) -#define ACL_GROUP_OBJ (0x04) -#define ACL_GROUP (0x08) -#define ACL_MASK (0x10) -#define ACL_OTHER (0x20) - -/* 23.2.7 ACL qualifier constants */ - -#define ACL_UNDEFINED_ID ((id_t)-1) - -typedef struct { - __le16 e_tag; - __le16 e_perm; - __le32 e_id; -} ext2_acl_entry; - -typedef struct { - __le16 e_tag; - __le16 e_perm; -} ext2_acl_entry_short; - -typedef struct { - __le32 a_version; -} ext2_acl_header; - -static inline int ext2_acl_count(size_t size) -{ - ssize_t s; - size -= sizeof(ext2_acl_header); - s = size - 4 * sizeof(ext2_acl_entry_short); - if (s < 0) { - if (size % sizeof(ext2_acl_entry_short)) - return -1; - return size / sizeof(ext2_acl_entry_short); - } else { - if (s % sizeof(ext2_acl_entry)) - return -1; - return s / sizeof(ext2_acl_entry) + 4; - } -} - -#define ACL_EA_VERSION 0x0002 - -typedef struct { - __le16 e_tag; - __le16 e_perm; - __le32 e_id; -} acl_ea_entry; - -typedef struct { - __le32 a_version; - acl_ea_entry a_entries[0]; -} acl_ea_header; - -static inline size_t acl_ea_size(int count) -{ - return sizeof(acl_ea_header) + count * sizeof(acl_ea_entry); -} - -static int ext2_acl_to_xattr(void *dst, const void *src, - size_t dst_size, size_t src_size) -{ - int i, count; - const void *end = src + src_size; - acl_ea_header *ext_acl = (acl_ea_header *)dst; - acl_ea_entry *dst_entry = ext_acl->a_entries; - ext2_acl_entry *src_entry; - - if (src_size < sizeof(ext2_acl_header)) - goto fail; - if (((ext2_acl_header *)src)->a_version != - cpu_to_le32(EXT2_ACL_VERSION)) - goto fail; - src += sizeof(ext2_acl_header); - count = ext2_acl_count(src_size); - if (count <= 0) - goto fail; - - BUG_ON(dst_size < acl_ea_size(count)); - ext_acl->a_version = cpu_to_le32(ACL_EA_VERSION); - for (i = 0; i < count; i++, dst_entry++) { - src_entry = (ext2_acl_entry *)src; - if (src + sizeof(ext2_acl_entry_short) > end) - goto fail; - dst_entry->e_tag = src_entry->e_tag; - dst_entry->e_perm = src_entry->e_perm; - switch (le16_to_cpu(src_entry->e_tag)) { - case ACL_USER_OBJ: - case ACL_GROUP_OBJ: - case ACL_MASK: - case ACL_OTHER: - src += sizeof(ext2_acl_entry_short); - dst_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); - break; - case ACL_USER: - case ACL_GROUP: - src += sizeof(ext2_acl_entry); - if (src > end) - goto fail; - dst_entry->e_id = src_entry->e_id; - break; - default: - goto fail; - } - } - if (src != end) - goto fail; - return 0; -fail: - return -EINVAL; -} - -static char *xattr_prefix_table[] = { - [1] = "user.", - [2] = "system.posix_acl_access", - [3] = "system.posix_acl_default", - [4] = "trusted.", - [6] = "security.", -}; - -static int ext2_copy_single_xattr(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - struct ext2_ext_attr_entry *entry, - const void *data, u32 datalen) -{ - int ret = 0; - int name_len; - int name_index; - void *databuf = NULL; - char namebuf[XATTR_NAME_MAX + 1]; - - name_index = entry->e_name_index; - if (name_index >= ARRAY_SIZE(xattr_prefix_table) || - xattr_prefix_table[name_index] == NULL) - return -EOPNOTSUPP; - name_len = strlen(xattr_prefix_table[name_index]) + - entry->e_name_len; - if (name_len >= sizeof(namebuf)) - return -ERANGE; - - if (name_index == 2 || name_index == 3) { - size_t bufsize = acl_ea_size(ext2_acl_count(datalen)); - databuf = malloc(bufsize); - if (!databuf) - return -ENOMEM; - ret = ext2_acl_to_xattr(databuf, data, bufsize, datalen); - if (ret) - goto out; - data = databuf; - datalen = bufsize; - } - strncpy(namebuf, xattr_prefix_table[name_index], XATTR_NAME_MAX); - strncat(namebuf, EXT2_EXT_ATTR_NAME(entry), entry->e_name_len); - if (name_len + datalen > BTRFS_LEAF_DATA_SIZE(root) - - sizeof(struct btrfs_item) - sizeof(struct btrfs_dir_item)) { - fprintf(stderr, "skip large xattr on inode %Lu name %.*s\n", - objectid - INO_OFFSET, name_len, namebuf); - goto out; - } - ret = btrfs_insert_xattr_item(trans, root, namebuf, name_len, - data, datalen, objectid); -out: - free(databuf); - return ret; -} - -static int ext2_copy_extended_attrs(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - struct btrfs_inode_item *btrfs_inode, - ext2_filsys ext2_fs, ext2_ino_t ext2_ino) -{ - int ret = 0; - int inline_ea = 0; - errcode_t err; - u32 datalen; - u32 block_size = ext2_fs->blocksize; - u32 inode_size = EXT2_INODE_SIZE(ext2_fs->super); - struct ext2_inode_large *ext2_inode; - struct ext2_ext_attr_entry *entry; - void *data; - char *buffer = NULL; - char inode_buf[EXT2_GOOD_OLD_INODE_SIZE]; - - if (inode_size <= EXT2_GOOD_OLD_INODE_SIZE) { - ext2_inode = (struct ext2_inode_large *)inode_buf; - } else { - ext2_inode = (struct ext2_inode_large *)malloc(inode_size); - if (!ext2_inode) - return -ENOMEM; - } - err = ext2fs_read_inode_full(ext2_fs, ext2_ino, (void *)ext2_inode, - inode_size); - if (err) { - fprintf(stderr, "ext2fs_read_inode_full: %s\n", - error_message(err)); - ret = -1; - goto out; - } - - if (ext2_ino > ext2_fs->super->s_first_ino && - inode_size > EXT2_GOOD_OLD_INODE_SIZE) { - if (EXT2_GOOD_OLD_INODE_SIZE + - ext2_inode->i_extra_isize > inode_size) { - ret = -EIO; - goto out; - } - if (ext2_inode->i_extra_isize != 0 && - EXT2_XATTR_IHDR(ext2_inode)->h_magic == - EXT2_EXT_ATTR_MAGIC) { - inline_ea = 1; - } - } - if (inline_ea) { - int total; - void *end = (void *)ext2_inode + inode_size; - entry = EXT2_XATTR_IFIRST(ext2_inode); - total = end - (void *)entry; - ret = ext2_xattr_check_names(entry, end); - if (ret) - goto out; - while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { - ret = ext2_xattr_check_entry(entry, total); - if (ret) - goto out; - data = (void *)EXT2_XATTR_IFIRST(ext2_inode) + - entry->e_value_offs; - datalen = entry->e_value_size; - ret = ext2_copy_single_xattr(trans, root, objectid, - entry, data, datalen); - if (ret) - goto out; - entry = EXT2_EXT_ATTR_NEXT(entry); - } - } - - if (ext2_inode->i_file_acl == 0) - goto out; - - buffer = malloc(block_size); - if (!buffer) { - ret = -ENOMEM; - goto out; - } - err = ext2fs_read_ext_attr(ext2_fs, ext2_inode->i_file_acl, buffer); - if (err) { - fprintf(stderr, "ext2fs_read_ext_attr: %s\n", - error_message(err)); - ret = -1; - goto out; - } - ret = ext2_xattr_check_block(buffer, block_size); - if (ret) - goto out; - - entry = EXT2_XATTR_BFIRST(buffer); - while (!EXT2_EXT_IS_LAST_ENTRY(entry)) { - ret = ext2_xattr_check_entry(entry, block_size); - if (ret) - goto out; - data = buffer + entry->e_value_offs; - datalen = entry->e_value_size; - ret = ext2_copy_single_xattr(trans, root, objectid, - entry, data, datalen); - if (ret) - goto out; - entry = EXT2_EXT_ATTR_NEXT(entry); - } -out: - free(buffer); - if ((void *)ext2_inode != inode_buf) - free(ext2_inode); - return ret; -} -#define MINORBITS 20 -#define MKDEV(ma, mi) (((ma) << MINORBITS) | (mi)) - -static inline dev_t old_decode_dev(u16 val) -{ - return MKDEV((val >> 8) & 255, val & 255); -} - -static inline dev_t new_decode_dev(u32 dev) -{ - unsigned major = (dev & 0xfff00) >> 8; - unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); - return MKDEV(major, minor); -} - -static void ext2_copy_inode_item(struct btrfs_inode_item *dst, - struct ext2_inode *src, u32 blocksize) -{ - btrfs_set_stack_inode_generation(dst, 1); - btrfs_set_stack_inode_sequence(dst, 0); - btrfs_set_stack_inode_transid(dst, 1); - btrfs_set_stack_inode_size(dst, src->i_size); - btrfs_set_stack_inode_nbytes(dst, 0); - btrfs_set_stack_inode_block_group(dst, 0); - btrfs_set_stack_inode_nlink(dst, src->i_links_count); - btrfs_set_stack_inode_uid(dst, src->i_uid | (src->i_uid_high << 16)); - btrfs_set_stack_inode_gid(dst, src->i_gid | (src->i_gid_high << 16)); - btrfs_set_stack_inode_mode(dst, src->i_mode); - btrfs_set_stack_inode_rdev(dst, 0); - btrfs_set_stack_inode_flags(dst, 0); - btrfs_set_stack_timespec_sec(&dst->atime, src->i_atime); - btrfs_set_stack_timespec_nsec(&dst->atime, 0); - btrfs_set_stack_timespec_sec(&dst->ctime, src->i_ctime); - btrfs_set_stack_timespec_nsec(&dst->ctime, 0); - btrfs_set_stack_timespec_sec(&dst->mtime, src->i_mtime); - btrfs_set_stack_timespec_nsec(&dst->mtime, 0); - btrfs_set_stack_timespec_sec(&dst->otime, 0); - btrfs_set_stack_timespec_nsec(&dst->otime, 0); - - if (S_ISDIR(src->i_mode)) { - btrfs_set_stack_inode_size(dst, 0); - btrfs_set_stack_inode_nlink(dst, 1); - } - if (S_ISREG(src->i_mode)) { - btrfs_set_stack_inode_size(dst, (u64)src->i_size_high << 32 | - (u64)src->i_size); - } - if (!S_ISREG(src->i_mode) && !S_ISDIR(src->i_mode) && - !S_ISLNK(src->i_mode)) { - if (src->i_block[0]) { - btrfs_set_stack_inode_rdev(dst, - old_decode_dev(src->i_block[0])); - } else { - btrfs_set_stack_inode_rdev(dst, - new_decode_dev(src->i_block[1])); - } - } - memset(&dst->reserved, 0, sizeof(dst->reserved)); -} - -/* - * copy a single inode. do all the required works, such as cloning - * inode item, creating file extents and creating directory entries. - */ -static int ext2_copy_single_inode(struct btrfs_trans_handle *trans, - struct btrfs_root *root, u64 objectid, - ext2_filsys ext2_fs, ext2_ino_t ext2_ino, - struct ext2_inode *ext2_inode, - int datacsum, int packing, int noxattr) -{ - int ret; - struct btrfs_inode_item btrfs_inode; - - if (ext2_inode->i_links_count == 0) - return 0; - - ext2_copy_inode_item(&btrfs_inode, ext2_inode, ext2_fs->blocksize); - if (!datacsum && S_ISREG(ext2_inode->i_mode)) { - u32 flags = btrfs_stack_inode_flags(&btrfs_inode) | - BTRFS_INODE_NODATASUM; - btrfs_set_stack_inode_flags(&btrfs_inode, flags); - } - - switch (ext2_inode->i_mode & S_IFMT) { - case S_IFREG: - ret = ext2_create_file_extents(trans, root, objectid, - &btrfs_inode, ext2_fs, ext2_ino, datacsum, packing); - break; - case S_IFDIR: - ret = ext2_create_dir_entries(trans, root, objectid, - &btrfs_inode, ext2_fs, ext2_ino); - break; - case S_IFLNK: - ret = ext2_create_symbol_link(trans, root, objectid, - &btrfs_inode, ext2_fs, ext2_ino, ext2_inode); - break; - default: - ret = 0; - break; - } - if (ret) - return ret; - - if (!noxattr) { - ret = ext2_copy_extended_attrs(trans, root, objectid, - &btrfs_inode, ext2_fs, ext2_ino); - if (ret) - return ret; - } - return btrfs_insert_inode(trans, root, objectid, &btrfs_inode); -} - -/* - * scan ext2's inode bitmap and copy all used inodes. - */ -static int ext2_copy_inodes(struct btrfs_convert_context *cctx, - struct btrfs_root *root, - int datacsum, int packing, int noxattr, struct task_ctx *p) -{ - ext2_filsys ext2_fs = cctx->fs_data; - int ret; - errcode_t err; - ext2_inode_scan ext2_scan; - struct ext2_inode ext2_inode; - ext2_ino_t ext2_ino; - u64 objectid; - struct btrfs_trans_handle *trans; - - trans = btrfs_start_transaction(root, 1); - if (!trans) - return -ENOMEM; - err = ext2fs_open_inode_scan(ext2_fs, 0, &ext2_scan); - if (err) { - fprintf(stderr, "ext2fs_open_inode_scan: %s\n", error_message(err)); - return -1; - } - while (!(err = ext2fs_get_next_inode(ext2_scan, &ext2_ino, - &ext2_inode))) { - /* no more inodes */ - if (ext2_ino == 0) - break; - /* skip special inode in ext2fs */ - if (ext2_ino < EXT2_GOOD_OLD_FIRST_INO && - ext2_ino != EXT2_ROOT_INO) - continue; - objectid = ext2_ino + INO_OFFSET; - ret = ext2_copy_single_inode(trans, root, - objectid, ext2_fs, ext2_ino, - &ext2_inode, datacsum, packing, - noxattr); - p->cur_copy_inodes++; - if (ret) - return ret; - if (trans->blocks_used >= 4096) { - ret = btrfs_commit_transaction(trans, root); - BUG_ON(ret); - trans = btrfs_start_transaction(root, 1); - BUG_ON(!trans); - } - } - if (err) { - fprintf(stderr, "ext2fs_get_next_inode: %s\n", error_message(err)); - return -1; - } - ret = btrfs_commit_transaction(trans, root); - BUG_ON(ret); - ext2fs_close_inode_scan(ext2_scan); - - return ret; -} - -static const struct btrfs_convert_operations ext2_convert_ops = { - .name = "ext2", - .open_fs = ext2_open_fs, - .read_used_space = ext2_read_used_space, - .copy_inodes = ext2_copy_inodes, - .close_fs = ext2_close_fs, -}; - -#endif - -static const struct btrfs_convert_operations *convert_operations[] = { -#if BTRFSCONVERT_EXT2 - &ext2_convert_ops, -#endif -}; - -static int convert_open_fs(const char *devname, - struct btrfs_convert_context *cctx) -{ - int i; - - memset(cctx, 0, sizeof(*cctx)); - - for (i = 0; i < ARRAY_SIZE(convert_operations); i++) { - int ret = convert_operations[i]->open_fs(cctx, devname); - - if (ret == 0) { - cctx->convert_ops = convert_operations[i]; - return ret; - } - } - - fprintf(stderr, "No file system found to convert.\n"); - return -1; -} - -static int do_convert(const char *devname, int datacsum, int packing, - int noxattr, u32 nodesize, int copylabel, const char *fslabel, - int progress, u64 features) -{ - int ret; - int fd = -1; - u32 blocksize; - u64 total_bytes; - struct btrfs_root *root; - struct btrfs_root *image_root; - struct btrfs_convert_context cctx; - struct btrfs_key key; - char *subvol_name = NULL; - struct task_ctx ctx; - char features_buf[64]; - struct btrfs_mkfs_config mkfs_cfg; - - init_convert_context(&cctx); - ret = convert_open_fs(devname, &cctx); - if (ret) - goto fail; - ret = convert_read_used_space(&cctx); - if (ret) - goto fail; - - blocksize = cctx.blocksize; - total_bytes = (u64)blocksize * (u64)cctx.block_count; - if (blocksize < 4096) { - error("block size is too small: %u < 4096", blocksize); - goto fail; - } - if (btrfs_check_nodesize(nodesize, blocksize, features)) - goto fail; - fd = open(devname, O_RDWR); - if (fd < 0) { - error("unable to open %s: %s", devname, strerror(errno)); - goto fail; - } - btrfs_parse_features_to_string(features_buf, features); - if (features == BTRFS_MKFS_DEFAULT_FEATURES) - strcat(features_buf, " (default)"); - - printf("create btrfs filesystem:\n"); - printf("\tblocksize: %u\n", blocksize); - printf("\tnodesize: %u\n", nodesize); - printf("\tfeatures: %s\n", features_buf); - - mkfs_cfg.label = cctx.volume_name; - mkfs_cfg.num_bytes = total_bytes; - mkfs_cfg.nodesize = nodesize; - mkfs_cfg.sectorsize = blocksize; - mkfs_cfg.stripesize = blocksize; - mkfs_cfg.features = features; - /* New convert need these space */ - memset(mkfs_cfg.chunk_uuid, 0, BTRFS_UUID_UNPARSED_SIZE); - memset(mkfs_cfg.fs_uuid, 0, BTRFS_UUID_UNPARSED_SIZE); - - ret = make_btrfs(fd, &mkfs_cfg, &cctx); - if (ret) { - error("unable to create initial ctree: %s", strerror(-ret)); - goto fail; - } - - root = open_ctree_fd(fd, devname, mkfs_cfg.super_bytenr, - OPEN_CTREE_WRITES | OPEN_CTREE_FS_PARTIAL); - if (!root) { - error("unable to open ctree"); - goto fail; - } - ret = init_btrfs(&mkfs_cfg, root, &cctx, datacsum, packing, noxattr); - if (ret) { - error("unable to setup the root tree: %d", ret); - goto fail; - } - - printf("creating %s image file\n", cctx.convert_ops->name); - ret = asprintf(&subvol_name, "%s_saved", cctx.convert_ops->name); - if (ret < 0) { - error("memory allocation failure for subvolume name: %s_saved", - cctx.convert_ops->name); - goto fail; - } - key.objectid = CONV_IMAGE_SUBVOL_OBJECTID; - key.offset = (u64)-1; - key.type = BTRFS_ROOT_ITEM_KEY; - image_root = btrfs_read_fs_root(root->fs_info, &key); - if (!image_root) { - error("unable to create image subvolume"); - goto fail; - } - ret = create_image(image_root, &mkfs_cfg, &cctx, fd, - mkfs_cfg.num_bytes, "image", datacsum); - if (ret) { - error("failed to create %s/image: %d", subvol_name, ret); - goto fail; - } - - printf("creating btrfs metadata"); - ctx.max_copy_inodes = (cctx.inodes_count - cctx.free_inodes_count); - ctx.cur_copy_inodes = 0; - - if (progress) { - ctx.info = task_init(print_copied_inodes, after_copied_inodes, - &ctx); - task_start(ctx.info); - } - ret = copy_inodes(&cctx, root, datacsum, packing, noxattr, &ctx); - if (ret) { - error("error during copy_inodes %d", ret); - goto fail; - } - if (progress) { - task_stop(ctx.info); - task_deinit(ctx.info); - } - - image_root = link_subvol(root, subvol_name, CONV_IMAGE_SUBVOL_OBJECTID); - if (!image_root) { - error("unable to link subvolume %s", subvol_name); - goto fail; - } - - free(subvol_name); - - memset(root->fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE); - if (copylabel == 1) { - __strncpy_null(root->fs_info->super_copy->label, - cctx.volume_name, BTRFS_LABEL_SIZE - 1); - printf("copy label '%s'\n", root->fs_info->super_copy->label); - } else if (copylabel == -1) { - strcpy(root->fs_info->super_copy->label, fslabel); - printf("set label to '%s'\n", fslabel); - } - - ret = close_ctree(root); - if (ret) { - error("close_ctree failed: %d", ret); - goto fail; - } - convert_close_fs(&cctx); - clean_convert_context(&cctx); - - /* - * If this step succeed, we get a mountable btrfs. Otherwise - * the source fs is left unchanged. - */ - ret = migrate_super_block(fd, mkfs_cfg.super_bytenr, blocksize); - if (ret) { - error("unable to migrate super block: %d", ret); - goto fail; - } - - root = open_ctree_fd(fd, devname, 0, - OPEN_CTREE_WRITES | OPEN_CTREE_FS_PARTIAL); - if (!root) { - error("unable to open ctree for finalization"); - goto fail; - } - root->fs_info->finalize_on_close = 1; - close_ctree(root); - close(fd); - - printf("conversion complete"); - return 0; -fail: - clean_convert_context(&cctx); - if (fd != -1) - close(fd); - warning( -"an error occurred during conversion, filesystem is partially created but not finalized and not mountable"); - return -1; -} - -/* - * Check if a non 1:1 mapped chunk can be rolled back. - * For new convert, it's OK while for old convert it's not. - */ -static int may_rollback_chunk(struct btrfs_fs_info *fs_info, u64 bytenr) -{ - struct btrfs_block_group_cache *bg; - struct btrfs_key key; - struct btrfs_path path; - struct btrfs_root *extent_root = fs_info->extent_root; - u64 bg_start; - u64 bg_end; - int ret; - - bg = btrfs_lookup_first_block_group(fs_info, bytenr); - if (!bg) - return -ENOENT; - bg_start = bg->key.objectid; - bg_end = bg->key.objectid + bg->key.offset; - - key.objectid = bg_end; - key.type = BTRFS_METADATA_ITEM_KEY; - key.offset = 0; - btrfs_init_path(&path); - - ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); - if (ret < 0) - return ret; - - while (1) { - struct btrfs_extent_item *ei; - - ret = btrfs_previous_extent_item(extent_root, &path, bg_start); - if (ret > 0) { - ret = 0; - break; - } - if (ret < 0) - break; - - btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); - if (key.type == BTRFS_METADATA_ITEM_KEY) - continue; - /* Now it's EXTENT_ITEM_KEY only */ - ei = btrfs_item_ptr(path.nodes[0], path.slots[0], - struct btrfs_extent_item); - /* - * Found data extent, means this is old convert must follow 1:1 - * mapping. - */ - if (btrfs_extent_flags(path.nodes[0], ei) - & BTRFS_EXTENT_FLAG_DATA) { - ret = -EINVAL; - break; - } - } - btrfs_release_path(&path); - return ret; -} - -static int may_rollback(struct btrfs_root *root) -{ - struct btrfs_fs_info *info = root->fs_info; - struct btrfs_multi_bio *multi = NULL; - u64 bytenr; - u64 length; - u64 physical; - u64 total_bytes; - int num_stripes; - int ret; - - if (btrfs_super_num_devices(info->super_copy) != 1) - goto fail; - - bytenr = BTRFS_SUPER_INFO_OFFSET; - total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy); - - while (1) { - ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr, - &length, &multi, 0, NULL); - if (ret) { - if (ret == -ENOENT) { - /* removed block group at the tail */ - if (length == (u64)-1) - break; - - /* removed block group in the middle */ - goto next; - } - goto fail; - } - - num_stripes = multi->num_stripes; - physical = multi->stripes[0].physical; - kfree(multi); - - if (num_stripes != 1) { - error("num stripes for bytenr %llu is not 1", bytenr); - goto fail; - } - - /* - * Extra check for new convert, as metadata chunk from new - * convert is much more free than old convert, it doesn't need - * to do 1:1 mapping. - */ - if (physical != bytenr) { - /* - * Check if it's a metadata chunk and has only metadata - * extent. - */ - ret = may_rollback_chunk(info, bytenr); - if (ret < 0) - goto fail; - } -next: - bytenr += length; - if (bytenr >= total_bytes) - break; - } - return 0; -fail: - return -1; -} - -static int do_rollback(const char *devname) -{ - int fd = -1; - int ret; - int i; - struct btrfs_root *root; - struct btrfs_root *image_root; - struct btrfs_root *chunk_root; - struct btrfs_dir_item *dir; - struct btrfs_inode_item *inode; - struct btrfs_file_extent_item *fi; - struct btrfs_trans_handle *trans; - struct extent_buffer *leaf; - struct btrfs_block_group_cache *cache1; - struct btrfs_block_group_cache *cache2; - struct btrfs_key key; - struct btrfs_path path; - struct extent_io_tree io_tree; - char *buf = NULL; - char *name; - u64 bytenr; - u64 num_bytes; - u64 root_dir; - u64 objectid; - u64 offset; - u64 start; - u64 end; - u64 sb_bytenr; - u64 first_free; - u64 total_bytes; - u32 sectorsize; - - extent_io_tree_init(&io_tree); - - fd = open(devname, O_RDWR); - if (fd < 0) { - error("unable to open %s: %s", devname, strerror(errno)); - goto fail; - } - root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES); - if (!root) { - error("unable to open ctree"); - goto fail; - } - ret = may_rollback(root); - if (ret < 0) { - error("unable to do rollback: %d", ret); - goto fail; - } - - sectorsize = root->sectorsize; - buf = malloc(sectorsize); - if (!buf) { - error("unable to allocate memory"); - goto fail; - } - - btrfs_init_path(&path); - - key.objectid = CONV_IMAGE_SUBVOL_OBJECTID; - key.type = BTRFS_ROOT_BACKREF_KEY; - key.offset = BTRFS_FS_TREE_OBJECTID; - ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, &path, 0, - 0); - btrfs_release_path(&path); - if (ret > 0) { - error("unable to convert ext2 image subvolume, is it deleted?"); - goto fail; - } else if (ret < 0) { - error("unable to open ext2_saved, id %llu: %s", - (unsigned long long)key.objectid, strerror(-ret)); - goto fail; - } - - key.objectid = CONV_IMAGE_SUBVOL_OBJECTID; - key.type = BTRFS_ROOT_ITEM_KEY; - key.offset = (u64)-1; - image_root = btrfs_read_fs_root(root->fs_info, &key); - if (!image_root || IS_ERR(image_root)) { - error("unable to open subvolume %llu: %ld", - (unsigned long long)key.objectid, PTR_ERR(image_root)); - goto fail; - } - - name = "image"; - root_dir = btrfs_root_dirid(&root->root_item); - dir = btrfs_lookup_dir_item(NULL, image_root, &path, - root_dir, name, strlen(name), 0); - if (!dir || IS_ERR(dir)) { - error("unable to find file %s: %ld", name, PTR_ERR(dir)); - goto fail; - } - leaf = path.nodes[0]; - btrfs_dir_item_key_to_cpu(leaf, dir, &key); - btrfs_release_path(&path); - - objectid = key.objectid; - - ret = btrfs_lookup_inode(NULL, image_root, &path, &key, 0); - if (ret) { - error("unable to find inode item: %d", ret); - goto fail; - } - leaf = path.nodes[0]; - inode = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item); - total_bytes = btrfs_inode_size(leaf, inode); - btrfs_release_path(&path); - - key.objectid = objectid; - key.offset = 0; - btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); - ret = btrfs_search_slot(NULL, image_root, &key, &path, 0, 0); - if (ret != 0) { - error("unable to find first file extent: %d", ret); - btrfs_release_path(&path); - goto fail; - } - - /* build mapping tree for the relocated blocks */ - for (offset = 0; offset < total_bytes; ) { - leaf = path.nodes[0]; - if (path.slots[0] >= btrfs_header_nritems(leaf)) { - ret = btrfs_next_leaf(root, &path); - if (ret != 0) - break; - continue; - } - - btrfs_item_key_to_cpu(leaf, &key, path.slots[0]); - if (key.objectid != objectid || key.offset != offset || - btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) - break; - - fi = btrfs_item_ptr(leaf, path.slots[0], - struct btrfs_file_extent_item); - if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) - break; - if (btrfs_file_extent_compression(leaf, fi) || - btrfs_file_extent_encryption(leaf, fi) || - btrfs_file_extent_other_encoding(leaf, fi)) - break; - - bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); - /* skip holes and direct mapped extents */ - if (bytenr == 0 || bytenr == offset) - goto next_extent; - - bytenr += btrfs_file_extent_offset(leaf, fi); - num_bytes = btrfs_file_extent_num_bytes(leaf, fi); - - cache1 = btrfs_lookup_block_group(root->fs_info, offset); - cache2 = btrfs_lookup_block_group(root->fs_info, - offset + num_bytes - 1); - /* - * Here we must take consideration of old and new convert - * behavior. - * For old convert case, sign, there is no consist chunk type - * that will cover the extent. META/DATA/SYS are all possible. - * Just ensure relocate one is in SYS chunk. - * For new convert case, they are all covered by DATA chunk. - * - * So, there is not valid chunk type check for it now. - */ - if (cache1 != cache2) - break; - - set_extent_bits(&io_tree, offset, offset + num_bytes - 1, - EXTENT_LOCKED, GFP_NOFS); - set_state_private(&io_tree, offset, bytenr); -next_extent: - offset += btrfs_file_extent_num_bytes(leaf, fi); - path.slots[0]++; - } - btrfs_release_path(&path); - - if (offset < total_bytes) { - error("unable to build extent mapping (offset %llu, total_bytes %llu)", - (unsigned long long)offset, - (unsigned long long)total_bytes); - error("converted filesystem after balance is unable to rollback"); - goto fail; - } - - first_free = BTRFS_SUPER_INFO_OFFSET + 2 * sectorsize - 1; - first_free &= ~((u64)sectorsize - 1); - /* backup for extent #0 should exist */ - if(!test_range_bit(&io_tree, 0, first_free - 1, EXTENT_LOCKED, 1)) { - error("no backup for the first extent"); - goto fail; - } - /* force no allocation from system block group */ - root->fs_info->system_allocs = -1; - trans = btrfs_start_transaction(root, 1); - BUG_ON(!trans); - /* - * recow the whole chunk tree, this will remove all chunk tree blocks - * from system block group - */ - chunk_root = root->fs_info->chunk_root; - memset(&key, 0, sizeof(key)); - while (1) { - ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1); - if (ret < 0) - break; - - ret = btrfs_next_leaf(chunk_root, &path); - if (ret) - break; - - btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); - btrfs_release_path(&path); - } - btrfs_release_path(&path); - - offset = 0; - num_bytes = 0; - while(1) { - cache1 = btrfs_lookup_block_group(root->fs_info, offset); - if (!cache1) - break; - - if (cache1->flags & BTRFS_BLOCK_GROUP_SYSTEM) - num_bytes += btrfs_block_group_used(&cache1->item); - - offset = cache1->key.objectid + cache1->key.offset; - } - /* only extent #0 left in system block group? */ - if (num_bytes > first_free) { - error( - "unable to empty system block group (num_bytes %llu, first_free %llu", - (unsigned long long)num_bytes, - (unsigned long long)first_free); - goto fail; - } - /* create a system chunk that maps the whole device */ - ret = prepare_system_chunk_sb(root->fs_info->super_copy); - if (ret) { - error("unable to update system chunk: %d", ret); - goto fail; - } - - ret = btrfs_commit_transaction(trans, root); - BUG_ON(ret); - - ret = close_ctree(root); - if (ret) { - error("close_ctree failed: %d", ret); - goto fail; - } - - /* zero btrfs super block mirrors */ - memset(buf, 0, sectorsize); - for (i = 1 ; i < BTRFS_SUPER_MIRROR_MAX; i++) { - bytenr = btrfs_sb_offset(i); - if (bytenr >= total_bytes) - break; - ret = pwrite(fd, buf, sectorsize, bytenr); - if (ret != sectorsize) { - error("zeroing superblock mirror %d failed: %d", - i, ret); - goto fail; - } - } - - sb_bytenr = (u64)-1; - /* copy all relocated blocks back */ - while(1) { - ret = find_first_extent_bit(&io_tree, 0, &start, &end, - EXTENT_LOCKED); - if (ret) - break; - - ret = get_state_private(&io_tree, start, &bytenr); - BUG_ON(ret); - - clear_extent_bits(&io_tree, start, end, EXTENT_LOCKED, - GFP_NOFS); - - while (start <= end) { - if (start == BTRFS_SUPER_INFO_OFFSET) { - sb_bytenr = bytenr; - goto next_sector; - } - ret = pread(fd, buf, sectorsize, bytenr); - if (ret < 0) { - error("reading superblock at %llu failed: %d", - (unsigned long long)bytenr, ret); - goto fail; - } - BUG_ON(ret != sectorsize); - ret = pwrite(fd, buf, sectorsize, start); - if (ret < 0) { - error("writing superblock at %llu failed: %d", - (unsigned long long)start, ret); - goto fail; - } - BUG_ON(ret != sectorsize); -next_sector: - start += sectorsize; - bytenr += sectorsize; - } - } - - ret = fsync(fd); - if (ret < 0) { - error("fsync failed: %s", strerror(errno)); - goto fail; - } - /* - * finally, overwrite btrfs super block. - */ - ret = pread(fd, buf, sectorsize, sb_bytenr); - if (ret < 0) { - error("reading primary superblock failed: %s", - strerror(errno)); - goto fail; - } - BUG_ON(ret != sectorsize); - ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET); - if (ret < 0) { - error("writing primary superblock failed: %s", - strerror(errno)); - goto fail; - } - BUG_ON(ret != sectorsize); - ret = fsync(fd); - if (ret < 0) { - error("fsync failed: %s", strerror(errno)); - goto fail; - } - - close(fd); - free(buf); - extent_io_tree_cleanup(&io_tree); - printf("rollback complete\n"); - return 0; - -fail: - if (fd != -1) - close(fd); - free(buf); - error("rollback aborted"); - return -1; -} - -static void print_usage(void) -{ - printf("usage: btrfs-convert [options] device\n"); - printf("options:\n"); - printf("\t-d|--no-datasum disable data checksum, sets NODATASUM\n"); - printf("\t-i|--no-xattr ignore xattrs and ACLs\n"); - printf("\t-n|--no-inline disable inlining of small files to metadata\n"); - printf("\t-N|--nodesize SIZE set filesystem metadata nodesize\n"); - printf("\t-r|--rollback roll back to the original filesystem\n"); - printf("\t-l|--label LABEL set filesystem label\n"); - printf("\t-L|--copy-label use label from converted filesystem\n"); - printf("\t-p|--progress show converting progress (default)\n"); - printf("\t-O|--features LIST comma separated list of filesystem features\n"); - printf("\t--no-progress show only overview, not the detailed progress\n"); - printf("\n"); - printf("Suported filesystems:\n"); - printf("\text2/3/4: %s\n", BTRFSCONVERT_EXT2 ? "yes" : "no"); -} - -int main(int argc, char *argv[]) -{ - int ret; - int packing = 1; - int noxattr = 0; - int datacsum = 1; - u32 nodesize = max_t(u32, sysconf(_SC_PAGESIZE), - BTRFS_MKFS_DEFAULT_NODE_SIZE); - int rollback = 0; - int copylabel = 0; - int usage_error = 0; - int progress = 1; - char *file; - char fslabel[BTRFS_LABEL_SIZE]; - u64 features = BTRFS_MKFS_DEFAULT_FEATURES; - - while(1) { - enum { GETOPT_VAL_NO_PROGRESS = 256 }; - static const struct option long_options[] = { - { "no-progress", no_argument, NULL, - GETOPT_VAL_NO_PROGRESS }, - { "no-datasum", no_argument, NULL, 'd' }, - { "no-inline", no_argument, NULL, 'n' }, - { "no-xattr", no_argument, NULL, 'i' }, - { "rollback", no_argument, NULL, 'r' }, - { "features", required_argument, NULL, 'O' }, - { "progress", no_argument, NULL, 'p' }, - { "label", required_argument, NULL, 'l' }, - { "copy-label", no_argument, NULL, 'L' }, - { "nodesize", required_argument, NULL, 'N' }, - { "help", no_argument, NULL, GETOPT_VAL_HELP}, - { NULL, 0, NULL, 0 } - }; - int c = getopt_long(argc, argv, "dinN:rl:LpO:", long_options, NULL); - - if (c < 0) - break; - switch(c) { - case 'd': - datacsum = 0; - break; - case 'i': - noxattr = 1; - break; - case 'n': - packing = 0; - break; - case 'N': - nodesize = parse_size(optarg); - break; - case 'r': - rollback = 1; - break; - case 'l': - copylabel = -1; - if (strlen(optarg) >= BTRFS_LABEL_SIZE) { - fprintf(stderr, - "WARNING: label too long, trimmed to %d bytes\n", - BTRFS_LABEL_SIZE - 1); - } - __strncpy_null(fslabel, optarg, BTRFS_LABEL_SIZE - 1); - break; - case 'L': - copylabel = 1; - break; - case 'p': - progress = 1; - break; - case 'O': { - char *orig = strdup(optarg); - char *tmp = orig; - - tmp = btrfs_parse_fs_features(tmp, &features); - if (tmp) { - fprintf(stderr, - "Unrecognized filesystem feature '%s'\n", - tmp); - free(orig); - exit(1); - } - free(orig); - if (features & BTRFS_FEATURE_LIST_ALL) { - btrfs_list_all_fs_features( - ~BTRFS_CONVERT_ALLOWED_FEATURES); - exit(0); - } - if (features & ~BTRFS_CONVERT_ALLOWED_FEATURES) { - char buf[64]; - - btrfs_parse_features_to_string(buf, - features & ~BTRFS_CONVERT_ALLOWED_FEATURES); - fprintf(stderr, - "ERROR: features not allowed for convert: %s\n", - buf); - exit(1); - } - - break; - } - case GETOPT_VAL_NO_PROGRESS: - progress = 0; - break; - case GETOPT_VAL_HELP: - default: - print_usage(); - return c != GETOPT_VAL_HELP; - } - } - set_argv0(argv); - if (check_argc_exact(argc - optind, 1)) { - print_usage(); - return 1; - } - - if (rollback && (!datacsum || noxattr || !packing)) { - fprintf(stderr, - "Usage error: -d, -i, -n options do not apply to rollback\n"); - usage_error++; - } - - if (usage_error) { - print_usage(); - return 1; - } - - file = argv[optind]; - ret = check_mounted(file); - if (ret < 0) { - fprintf(stderr, "Could not check mount status: %s\n", - strerror(-ret)); - return 1; - } else if (ret) { - fprintf(stderr, "%s is mounted\n", file); - return 1; - } - - if (rollback) { - ret = do_rollback(file); - } else { - ret = do_convert(file, datacsum, packing, noxattr, nodesize, - copylabel, fslabel, progress, features); - } - if (ret) - return 1; - return 0; -} |