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| author | Yan <yanzheng@21cn.com> | 2008-01-22 18:46:56 +0100 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 17:03:59 +0200 |
| commit | b17854275cd297d40c6c5562fa44a472314c6c7f (patch) | |
| tree | a8056de7cbc45dd927cf1220ff2dfc8f4e15dd17 /fs/btrfs/inode-map.c | |
| parent | Btrfs: Add mount -o ssd, which includes optimizations for seek free storage (diff) | |
| download | linux-b17854275cd297d40c6c5562fa44a472314c6c7f.tar.xz linux-b17854275cd297d40c6c5562fa44a472314c6c7f.zip | |
Fix for btrfs_find_free_objectid
btrfs_find_free_objectid may return a used objectid due to arithmetic
underflow. This bug may happen when parameter 'root' is tree root, so
it may cause serious problems when creating snapshot or sub-volume.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/inode-map.c')
| -rw-r--r-- | fs/btrfs/inode-map.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c index ab74977adf5c..a0925eabdaa2 100644 --- a/fs/btrfs/inode-map.c +++ b/fs/btrfs/inode-map.c @@ -62,7 +62,6 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, struct btrfs_path *path; struct btrfs_key key; int ret; - u64 hole_size = 0; int slot = 0; u64 last_ino = 0; int start_found; @@ -109,8 +108,7 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, if (start_found) { if (last_ino < search_start) last_ino = search_start; - hole_size = key.objectid - last_ino; - if (hole_size > 0) { + if (key.objectid > last_ino) { *objectid = last_ino; goto found; } |