Btrfs: fix extent_buffer leak in the metadata IO error handling

The scrub readahead branch brought in a new error handling hook,
but it was leaking extent_buffer references.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
(cherry picked from commit c674e04e1cd6049715e7b9446790f4b441e547c0)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 827a5e49372e2f675c4a51a7b6bffac56445bfad..6d97b3e8b5526ca5ef58eddf2fe7a4d24c069232 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -645,6 +645,7 @@ static int btree_io_failed_hook(struct bio *failed_bio,
                clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags);
                btree_readahead_hook(root, eb, eb->start, -EIO);
        }
+       free_extent_buffer(eb);
 
 out:
        return -EIO;    /* we fixed nothing */