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author | Chris Mason <chris.mason@oracle.com> | 2008-05-08 17:26:18 (GMT) |
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committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 15:04:02 (GMT) |
commit | bf4ef67924d87b0addb32f084e83a9283496350e (patch) | |
tree | 2935d0395028d878e57df73e5fbd2182abc16c41 /fs/btrfs/root-tree.c | |
parent | a061fc8da7b990faa41ca503e66faef3ecdeead0 (diff) | |
download | linux-bf4ef67924d87b0addb32f084e83a9283496350e.tar.xz |
Btrfs: Properly find the root for snapshotted blocks during chunk relocation
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/root-tree.c')
-rw-r--r-- | fs/btrfs/root-tree.c | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 08f19ec..8bf21ba 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -21,6 +21,51 @@ #include "disk-io.h" #include "print-tree.h" +/* + * returns 0 on finding something, 1 if no more roots are there + * and < 0 on error + */ +int btrfs_search_root(struct btrfs_root *root, u64 search_start, + u64 *found_objectid) +{ + struct btrfs_path *path; + struct btrfs_key search_key; + int ret; + + root = root->fs_info->tree_root; + search_key.objectid = search_start; + search_key.type = (u8)-1; + search_key.offset = (u64)-1; + + path = btrfs_alloc_path(); + BUG_ON(!path); +again: + ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); + if (ret < 0) + goto out; + if (ret == 0) { + ret = 1; + goto out; + } + if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { + ret = btrfs_next_leaf(root, path); + if (ret) + goto out; + } + btrfs_item_key_to_cpu(path->nodes[0], &search_key, path->slots[0]); + if (search_key.type != BTRFS_ROOT_ITEM_KEY) { + search_key.offset++; + btrfs_release_path(root, path); + goto again; + } + ret = 0; + *found_objectid = search_key.objectid; + +out: + btrfs_free_path(path); + return ret; +} + int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct btrfs_root_item *item, struct btrfs_key *key) { @@ -55,7 +100,6 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, memcpy(key, &found_key, sizeof(found_key)); ret = 0; out: - btrfs_release_path(root, path); btrfs_free_path(path); return ret; } |