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author | Wang Shilong <wangsl.fnst@cn.fujitsu.com> | 2014-01-12 14:38:33 +0100 |
---|---|---|
committer | Chris Mason <clm@fb.com> | 2014-01-28 22:20:33 +0100 |
commit | ade2e0b3eeca941a5cd486bac21599ff87f288c8 (patch) | |
tree | 02f0384a1cb911766a1ebc07ce5ce963d94cbfd6 /fs/btrfs/ctree.c | |
parent | Btrfs: fix missing skinny metadata check in scrub_stripe() (diff) | |
download | linux-ade2e0b3eeca941a5cd486bac21599ff87f288c8.tar.xz linux-ade2e0b3eeca941a5cd486bac21599ff87f288c8.zip |
Btrfs: fix to search previous metadata extent item since skinny metadata
There is a bug that using btrfs_previous_item() to search metadata extent item.
This is because in btrfs_previous_item(), we need type match, however, since
skinny metada was introduced by josef, we may mix this two types. So just
use btrfs_previous_item() is not working right.
To keep btrfs_previous_item() like normal tree search, i introduce another
function btrfs_previous_extent_item().
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/ctree.c')
-rw-r--r-- | fs/btrfs/ctree.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 9e9de68eb813..30f5b11d7dd3 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -5955,3 +5955,46 @@ int btrfs_previous_item(struct btrfs_root *root, } return 1; } + +/* + * search in extent tree to find a previous Metadata/Data extent item with + * min objecitd. + * + * returns 0 if something is found, 1 if nothing was found and < 0 on error + */ +int btrfs_previous_extent_item(struct btrfs_root *root, + struct btrfs_path *path, u64 min_objectid) +{ + struct btrfs_key found_key; + struct extent_buffer *leaf; + u32 nritems; + int ret; + + while (1) { + if (path->slots[0] == 0) { + btrfs_set_path_blocking(path); + ret = btrfs_prev_leaf(root, path); + if (ret != 0) + return ret; + } else { + path->slots[0]--; + } + leaf = path->nodes[0]; + nritems = btrfs_header_nritems(leaf); + if (nritems == 0) + return 1; + if (path->slots[0] == nritems) + path->slots[0]--; + + btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); + if (found_key.objectid < min_objectid) + break; + if (found_key.type == BTRFS_EXTENT_ITEM_KEY || + found_key.type == BTRFS_METADATA_ITEM_KEY) + return 0; + if (found_key.objectid == min_objectid && + found_key.type < BTRFS_EXTENT_ITEM_KEY) + break; + } + return 1; +} |