}
/*
+ * 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;
+}
+
+/*
* Open Ext2fs in readonly mode, read block allocation bitmap and
* inode bitmap into memory.
*/
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)
{
projects / platform / upstream / btrfs-progs.git / blobdiff