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| author | Filipe Manana <fdmanana@suse.com> | 2014-07-02 23:07:54 +0400 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-08-15 18:43:13 +0400 |
| commit | 6f7ff6d7832c6be13e8c95598884dbc40ad69fb7 (patch) | |
| tree | 77cfeb9532c7eb15a9d6a1c880066e49e24a9e96 | |
| parent | e339a6b097c515a31ce230d498c44ff2e89f1cf4 (diff) | |
| download | linux-6f7ff6d7832c6be13e8c95598884dbc40ad69fb7.tar.xz | |
Btrfs: read lock extent buffer while walking backrefs
Before processing the extent buffer, acquire a read lock on it, so
that we're safe against concurrent updates on the extent buffer.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
| -rw-r--r-- | fs/btrfs/backref.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index e25564bfcb46..a1efd39ca28a 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -1001,8 +1001,11 @@ again: ret = -EIO; goto out; } + btrfs_tree_read_lock(eb); + btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); ret = find_extent_in_eb(eb, bytenr, *extent_item_pos, &eie); + btrfs_tree_read_unlock_blocking(eb); free_extent_buffer(eb); if (ret < 0) goto out; |