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-rw-r--r--mkfs/rootdir.c672
1 files changed, 672 insertions, 0 deletions
diff --git a/mkfs/rootdir.c b/mkfs/rootdir.c
new file mode 100644
index 00000000..2cc8a3ac
--- /dev/null
+++ b/mkfs/rootdir.c
@@ -0,0 +1,672 @@
+/*
+ * Copyright (C) 2017 SUSE. 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.
+ */
+
+#include "kerncompat.h"
+#include "androidcompat.h"
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/xattr.h>
+#include <linux/limits.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include "ctree.h"
+#include "internal.h"
+#include "disk-io.h"
+#include "messages.h"
+#include "transaction.h"
+#include "utils.h"
+#include "mkfs/rootdir.h"
+#include "send-utils.h"
+
+static u64 index_cnt = 2;
+
+static int add_directory_items(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 objectid,
+ ino_t parent_inum, const char *name,
+ struct stat *st, int *dir_index_cnt)
+{
+ int ret;
+ int name_len;
+ struct btrfs_key location;
+ u8 filetype = 0;
+
+ name_len = strlen(name);
+
+ location.objectid = objectid;
+ location.offset = 0;
+ location.type = BTRFS_INODE_ITEM_KEY;
+
+ if (S_ISDIR(st->st_mode))
+ filetype = BTRFS_FT_DIR;
+ if (S_ISREG(st->st_mode))
+ filetype = BTRFS_FT_REG_FILE;
+ if (S_ISLNK(st->st_mode))
+ filetype = BTRFS_FT_SYMLINK;
+ if (S_ISSOCK(st->st_mode))
+ filetype = BTRFS_FT_SOCK;
+ if (S_ISCHR(st->st_mode))
+ filetype = BTRFS_FT_CHRDEV;
+ if (S_ISBLK(st->st_mode))
+ filetype = BTRFS_FT_BLKDEV;
+ if (S_ISFIFO(st->st_mode))
+ filetype = BTRFS_FT_FIFO;
+
+ ret = btrfs_insert_dir_item(trans, root, name, name_len,
+ parent_inum, &location,
+ filetype, index_cnt);
+ if (ret)
+ return ret;
+ ret = btrfs_insert_inode_ref(trans, root, name, name_len,
+ objectid, parent_inum, index_cnt);
+ *dir_index_cnt = index_cnt;
+ index_cnt++;
+
+ return ret;
+}
+
+static int fill_inode_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_inode_item *dst, struct stat *src)
+{
+ u64 blocks = 0;
+ u64 sectorsize = root->fs_info->sectorsize;
+
+ /*
+ * btrfs_inode_item has some reserved fields
+ * and represents on-disk inode entry, so
+ * zero everything to prevent information leak
+ */
+ memset(dst, 0, sizeof(*dst));
+
+ btrfs_set_stack_inode_generation(dst, trans->transid);
+ btrfs_set_stack_inode_size(dst, src->st_size);
+ btrfs_set_stack_inode_nbytes(dst, 0);
+ btrfs_set_stack_inode_block_group(dst, 0);
+ btrfs_set_stack_inode_nlink(dst, src->st_nlink);
+ btrfs_set_stack_inode_uid(dst, src->st_uid);
+ btrfs_set_stack_inode_gid(dst, src->st_gid);
+ btrfs_set_stack_inode_mode(dst, src->st_mode);
+ btrfs_set_stack_inode_rdev(dst, 0);
+ btrfs_set_stack_inode_flags(dst, 0);
+ btrfs_set_stack_timespec_sec(&dst->atime, src->st_atime);
+ btrfs_set_stack_timespec_nsec(&dst->atime, 0);
+ btrfs_set_stack_timespec_sec(&dst->ctime, src->st_ctime);
+ btrfs_set_stack_timespec_nsec(&dst->ctime, 0);
+ btrfs_set_stack_timespec_sec(&dst->mtime, src->st_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->st_mode)) {
+ btrfs_set_stack_inode_size(dst, 0);
+ btrfs_set_stack_inode_nlink(dst, 1);
+ }
+ if (S_ISREG(src->st_mode)) {
+ btrfs_set_stack_inode_size(dst, (u64)src->st_size);
+ if (src->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root))
+ btrfs_set_stack_inode_nbytes(dst, src->st_size);
+ else {
+ blocks = src->st_size / sectorsize;
+ if (src->st_size % sectorsize)
+ blocks += 1;
+ blocks *= sectorsize;
+ btrfs_set_stack_inode_nbytes(dst, blocks);
+ }
+ }
+ if (S_ISLNK(src->st_mode))
+ btrfs_set_stack_inode_nbytes(dst, src->st_size + 1);
+
+ return 0;
+}
+
+static int directory_select(const struct direct *entry)
+{
+ if (entry->d_name[0] == '.' &&
+ (entry->d_name[1] == 0 ||
+ (entry->d_name[1] == '.' && entry->d_name[2] == 0)))
+ return 0;
+ return 1;
+}
+
+static void free_namelist(struct direct **files, int count)
+{
+ int i;
+
+ if (count < 0)
+ return;
+
+ for (i = 0; i < count; ++i)
+ free(files[i]);
+ free(files);
+}
+
+static u64 calculate_dir_inode_size(const char *dirname)
+{
+ int count, i;
+ struct direct **files, *cur_file;
+ u64 dir_inode_size = 0;
+
+ count = scandir(dirname, &files, directory_select, NULL);
+
+ for (i = 0; i < count; i++) {
+ cur_file = files[i];
+ dir_inode_size += strlen(cur_file->d_name);
+ }
+
+ free_namelist(files, count);
+
+ dir_inode_size *= 2;
+ return dir_inode_size;
+}
+
+static int add_inode_items(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct stat *st, const char *name,
+ u64 self_objectid,
+ struct btrfs_inode_item *inode_ret)
+{
+ int ret;
+ struct btrfs_inode_item btrfs_inode;
+ u64 objectid;
+ u64 inode_size = 0;
+
+ fill_inode_item(trans, root, &btrfs_inode, st);
+ objectid = self_objectid;
+
+ if (S_ISDIR(st->st_mode)) {
+ inode_size = calculate_dir_inode_size(name);
+ btrfs_set_stack_inode_size(&btrfs_inode, inode_size);
+ }
+
+ ret = btrfs_insert_inode(trans, root, objectid, &btrfs_inode);
+
+ *inode_ret = btrfs_inode;
+ return ret;
+}
+
+static int add_xattr_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 objectid,
+ const char *file_name)
+{
+ int ret;
+ int cur_name_len;
+ char xattr_list[XATTR_LIST_MAX];
+ char *cur_name;
+ char cur_value[XATTR_SIZE_MAX];
+ char delimiter = '\0';
+ char *next_location = xattr_list;
+
+ ret = llistxattr(file_name, xattr_list, XATTR_LIST_MAX);
+ if (ret < 0) {
+ if (errno == ENOTSUP)
+ return 0;
+ error("getting a list of xattr failed for %s: %s", file_name,
+ strerror(errno));
+ return ret;
+ }
+ if (ret == 0)
+ return ret;
+
+ cur_name = strtok(xattr_list, &delimiter);
+ while (cur_name != NULL) {
+ cur_name_len = strlen(cur_name);
+ next_location += cur_name_len + 1;
+
+ ret = getxattr(file_name, cur_name, cur_value, XATTR_SIZE_MAX);
+ if (ret < 0) {
+ if (errno == ENOTSUP)
+ return 0;
+ error("gettig a xattr value failed for %s attr %s: %s",
+ file_name, cur_name, strerror(errno));
+ return ret;
+ }
+
+ ret = btrfs_insert_xattr_item(trans, root, cur_name,
+ cur_name_len, cur_value,
+ ret, objectid);
+ if (ret) {
+ error("inserting a xattr item failed for %s: %s",
+ file_name, strerror(-ret));
+ }
+
+ cur_name = strtok(next_location, &delimiter);
+ }
+
+ return ret;
+}
+
+static int add_symbolic_link(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ u64 objectid, const char *path_name)
+{
+ int ret;
+ char buf[PATH_MAX];
+
+ ret = readlink(path_name, buf, sizeof(buf));
+ if (ret <= 0) {
+ error("readlink failed for %s: %s", path_name, strerror(errno));
+ goto fail;
+ }
+ if (ret >= sizeof(buf)) {
+ error("symlink too long for %s", path_name);
+ ret = -1;
+ goto fail;
+ }
+
+ buf[ret] = '\0'; /* readlink does not do it for us */
+ ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
+ buf, ret + 1);
+fail:
+ return ret;
+}
+
+static int add_file_items(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_inode_item *btrfs_inode, u64 objectid,
+ struct stat *st, const char *path_name)
+{
+ int ret = -1;
+ ssize_t ret_read;
+ u64 bytes_read = 0;
+ struct btrfs_key key;
+ int blocks;
+ u32 sectorsize = root->fs_info->sectorsize;
+ u64 first_block = 0;
+ u64 file_pos = 0;
+ u64 cur_bytes;
+ u64 total_bytes;
+ struct extent_buffer *eb = NULL;
+ int fd;
+
+ if (st->st_size == 0)
+ return 0;
+
+ fd = open(path_name, O_RDONLY);
+ if (fd == -1) {
+ error("cannot open %s: %s", path_name, strerror(errno));
+ return ret;
+ }
+
+ blocks = st->st_size / sectorsize;
+ if (st->st_size % sectorsize)
+ blocks += 1;
+
+ if (st->st_size <= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
+ char *buffer = malloc(st->st_size);
+
+ if (!buffer) {
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ ret_read = pread64(fd, buffer, st->st_size, bytes_read);
+ if (ret_read == -1) {
+ error("cannot read %s at offset %llu length %llu: %s",
+ path_name, (unsigned long long)bytes_read,
+ (unsigned long long)st->st_size,
+ strerror(errno));
+ free(buffer);
+ goto end;
+ }
+
+ ret = btrfs_insert_inline_extent(trans, root, objectid, 0,
+ buffer, st->st_size);
+ free(buffer);
+ goto end;
+ }
+
+ /* round up our st_size to the FS blocksize */
+ total_bytes = (u64)blocks * sectorsize;
+
+ /*
+ * do our IO in extent buffers so it can work
+ * against any raid type
+ */
+ eb = calloc(1, sizeof(*eb) + sectorsize);
+ if (!eb) {
+ ret = -ENOMEM;
+ goto end;
+ }
+
+again:
+
+ /*
+ * keep our extent size at 1MB max, this makes it easier to work inside
+ * the tiny block groups created during mkfs
+ */
+ cur_bytes = min(total_bytes, (u64)SZ_1M);
+ ret = btrfs_reserve_extent(trans, root, cur_bytes, 0, 0, (u64)-1,
+ &key, 1);
+ if (ret)
+ goto end;
+
+ first_block = key.objectid;
+ bytes_read = 0;
+
+ while (bytes_read < cur_bytes) {
+
+ memset(eb->data, 0, sectorsize);
+
+ ret_read = pread64(fd, eb->data, sectorsize, file_pos +
+ bytes_read);
+ if (ret_read == -1) {
+ error("cannot read %s at offset %llu length %llu: %s",
+ path_name,
+ (unsigned long long)file_pos + bytes_read,
+ (unsigned long long)sectorsize,
+ strerror(errno));
+ goto end;
+ }
+
+ eb->start = first_block + bytes_read;
+ eb->len = sectorsize;
+
+ /*
+ * we're doing the csum before we record the extent, but
+ * that's ok
+ */
+ ret = btrfs_csum_file_block(trans, root->fs_info->csum_root,
+ first_block + bytes_read + sectorsize,
+ first_block + bytes_read,
+ eb->data, sectorsize);
+ if (ret)
+ goto end;
+
+ ret = write_and_map_eb(root->fs_info, eb);
+ if (ret) {
+ error("failed to write %s", path_name);
+ goto end;
+ }
+
+ bytes_read += sectorsize;
+ }
+
+ if (bytes_read) {
+ ret = btrfs_record_file_extent(trans, root, objectid,
+ btrfs_inode, file_pos, first_block, cur_bytes);
+ if (ret)
+ goto end;
+
+ }
+
+ file_pos += cur_bytes;
+ total_bytes -= cur_bytes;
+
+ if (total_bytes)
+ goto again;
+
+end:
+ free(eb);
+ close(fd);
+ return ret;
+}
+
+static int traverse_directory(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, const char *dir_name,
+ struct directory_name_entry *dir_head)
+{
+ int ret = 0;
+
+ struct btrfs_inode_item cur_inode;
+ struct btrfs_inode_item *inode_item;
+ int count, i, dir_index_cnt;
+ struct direct **files;
+ struct stat st;
+ struct directory_name_entry *dir_entry, *parent_dir_entry;
+ struct direct *cur_file;
+ ino_t parent_inum, cur_inum;
+ ino_t highest_inum = 0;
+ const char *parent_dir_name;
+ char real_path[PATH_MAX];
+ struct btrfs_path path;
+ struct extent_buffer *leaf;
+ struct btrfs_key root_dir_key;
+ u64 root_dir_inode_size = 0;
+
+ /* Add list for source directory */
+ dir_entry = malloc(sizeof(struct directory_name_entry));
+ if (!dir_entry)
+ return -ENOMEM;
+ dir_entry->dir_name = dir_name;
+ dir_entry->path = realpath(dir_name, real_path);
+ if (!dir_entry->path) {
+ error("realpath failed for %s: %s", dir_name, strerror(errno));
+ ret = -1;
+ goto fail_no_dir;
+ }
+
+ parent_inum = highest_inum + BTRFS_FIRST_FREE_OBJECTID;
+ dir_entry->inum = parent_inum;
+ list_add_tail(&dir_entry->list, &dir_head->list);
+
+ btrfs_init_path(&path);
+
+ root_dir_key.objectid = btrfs_root_dirid(&root->root_item);
+ root_dir_key.offset = 0;
+ root_dir_key.type = BTRFS_INODE_ITEM_KEY;
+ ret = btrfs_lookup_inode(trans, root, &path, &root_dir_key, 1);
+ if (ret) {
+ error("failed to lookup root dir: %d", ret);
+ goto fail_no_dir;
+ }
+
+ leaf = path.nodes[0];
+ inode_item = btrfs_item_ptr(leaf, path.slots[0],
+ struct btrfs_inode_item);
+
+ root_dir_inode_size = calculate_dir_inode_size(dir_name);
+ btrfs_set_inode_size(leaf, inode_item, root_dir_inode_size);
+ btrfs_mark_buffer_dirty(leaf);
+
+ btrfs_release_path(&path);
+
+ do {
+ parent_dir_entry = list_entry(dir_head->list.next,
+ struct directory_name_entry,
+ list);
+ list_del(&parent_dir_entry->list);
+
+ parent_inum = parent_dir_entry->inum;
+ parent_dir_name = parent_dir_entry->dir_name;
+ if (chdir(parent_dir_entry->path)) {
+ error("chdir failed for %s: %s",
+ parent_dir_name, strerror(errno));
+ ret = -1;
+ goto fail_no_files;
+ }
+
+ count = scandir(parent_dir_entry->path, &files,
+ directory_select, NULL);
+ if (count == -1) {
+ error("scandir failed for %s: %s",
+ parent_dir_name, strerror(errno));
+ ret = -1;
+ goto fail;
+ }
+
+ for (i = 0; i < count; i++) {
+ cur_file = files[i];
+
+ if (lstat(cur_file->d_name, &st) == -1) {
+ error("lstat failed for %s: %s",
+ cur_file->d_name, strerror(errno));
+ ret = -1;
+ goto fail;
+ }
+
+ cur_inum = st.st_ino;
+ ret = add_directory_items(trans, root,
+ cur_inum, parent_inum,
+ cur_file->d_name,
+ &st, &dir_index_cnt);
+ if (ret) {
+ error("unable to add directory items for %s: %d",
+ cur_file->d_name, ret);
+ goto fail;
+ }
+
+ ret = add_inode_items(trans, root, &st,
+ cur_file->d_name, cur_inum,
+ &cur_inode);
+ if (ret == -EEXIST) {
+ if (st.st_nlink <= 1) {
+ error(
+ "item %s already exists but has wrong st_nlink %lu <= 1",
+ cur_file->d_name,
+ (unsigned long)st.st_nlink);
+ goto fail;
+ }
+ continue;
+ }
+ if (ret) {
+ error("unable to add inode items for %s: %d",
+ cur_file->d_name, ret);
+ goto fail;
+ }
+
+ ret = add_xattr_item(trans, root,
+ cur_inum, cur_file->d_name);
+ if (ret) {
+ error("unable to add xattr items for %s: %d",
+ cur_file->d_name, ret);
+ if (ret != -ENOTSUP)
+ goto fail;
+ }
+
+ if (S_ISDIR(st.st_mode)) {
+ char tmp[PATH_MAX];
+
+ dir_entry = malloc(sizeof(*dir_entry));
+ if (!dir_entry) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ dir_entry->dir_name = cur_file->d_name;
+ if (path_cat_out(tmp, parent_dir_entry->path,
+ cur_file->d_name)) {
+ error("invalid path: %s/%s",
+ parent_dir_entry->path,
+ cur_file->d_name);
+ ret = -EINVAL;
+ goto fail;
+ }
+ dir_entry->path = strdup(tmp);
+ if (!dir_entry->path) {
+ error("not enough memory to store path");
+ ret = -ENOMEM;
+ goto fail;
+ }
+ dir_entry->inum = cur_inum;
+ list_add_tail(&dir_entry->list,
+ &dir_head->list);
+ } else if (S_ISREG(st.st_mode)) {
+ ret = add_file_items(trans, root, &cur_inode,
+ cur_inum, &st,
+ cur_file->d_name);
+ if (ret) {
+ error("unable to add file items for %s: %d",
+ cur_file->d_name, ret);
+ goto fail;
+ }
+ } else if (S_ISLNK(st.st_mode)) {
+ ret = add_symbolic_link(trans, root,
+ cur_inum, cur_file->d_name);
+ if (ret) {
+ error("unable to add symlink for %s: %d",
+ cur_file->d_name, ret);
+ goto fail;
+ }
+ }
+ }
+
+ free_namelist(files, count);
+ free(parent_dir_entry);
+
+ index_cnt = 2;
+
+ } while (!list_empty(&dir_head->list));
+
+out:
+ return !!ret;
+fail:
+ free_namelist(files, count);
+fail_no_files:
+ free(parent_dir_entry);
+ goto out;
+fail_no_dir:
+ free(dir_entry);
+ goto out;
+}
+
+int btrfs_mkfs_fill_dir(const char *source_dir, struct btrfs_root *root,
+ bool verbose)
+{
+ int ret;
+ struct btrfs_trans_handle *trans;
+ struct stat root_st;
+ struct directory_name_entry dir_head;
+ struct directory_name_entry *dir_entry = NULL;
+
+ ret = lstat(source_dir, &root_st);
+ if (ret) {
+ error("unable to lstat %s: %s", source_dir, strerror(errno));
+ ret = -errno;
+ goto out;
+ }
+
+ INIT_LIST_HEAD(&dir_head.list);
+
+ trans = btrfs_start_transaction(root, 1);
+ BUG_ON(IS_ERR(trans));
+ ret = traverse_directory(trans, root, source_dir, &dir_head);
+ if (ret) {
+ error("unable to traverse directory %s: %d", source_dir, ret);
+ goto fail;
+ }
+ ret = btrfs_commit_transaction(trans, root);
+ if (ret) {
+ error("transaction commit failed: %d", ret);
+ goto out;
+ }
+
+ if (verbose)
+ printf("Making image is completed.\n");
+ return 0;
+fail:
+ /*
+ * Since we don't have btrfs_abort_transaction() yet, uncommitted trans
+ * will trigger a BUG_ON().
+ *
+ * However before mkfs is fully finished, the magic number is invalid,
+ * so even we commit transaction here, the fs still can't be mounted.
+ *
+ * To do a graceful error out, here we commit transaction as a
+ * workaround.
+ * Since we have already hit some problem, the return value doesn't
+ * matter now.
+ */
+ btrfs_commit_transaction(trans, root);
+ while (!list_empty(&dir_head.list)) {
+ dir_entry = list_entry(dir_head.list.next,
+ struct directory_name_entry, list);
+ list_del(&dir_entry->list);
+ free(dir_entry);
+ }
+out:
+ return ret;
+}