From: Johannes Thumshirn johannes.thumshirn@wdc.com
[ Upstream commit c7c97ceff98cc459bf5e358e5cbd06fcb651d501 ]
Commit e546fe1da9bd ("block: Rework bio_split() return value") changed bio_split() so that it can return errors.
Add error handling for it in btrfs_split_bio() and ultimately btrfs_submit_chunk(). As the bio is not submitted, the bio counter must be decremented to pair btrfs_bio_counter_inc_blocked().
Reviewed-by: John Garry john.g.garry@oracle.com Signed-off-by: Johannes Thumshirn johannes.thumshirn@wdc.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/bio.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/bio.c b/fs/btrfs/bio.c index 7e0f9600b80c..2c8c7d9a6fcb 100644 --- a/fs/btrfs/bio.c +++ b/fs/btrfs/bio.c @@ -81,6 +81,9 @@ static struct btrfs_bio *btrfs_split_bio(struct btrfs_fs_info *fs_info,
bio = bio_split(&orig_bbio->bio, map_length >> SECTOR_SHIFT, GFP_NOFS, &btrfs_clone_bioset); + if (IS_ERR(bio)) + return ERR_CAST(bio); + bbio = btrfs_bio(bio); btrfs_bio_init(bbio, fs_info, NULL, orig_bbio); bbio->inode = orig_bbio->inode; @@ -678,7 +681,8 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num) &bioc, &smap, &mirror_num); if (error) { ret = errno_to_blk_status(error); - goto fail; + btrfs_bio_counter_dec(fs_info); + goto end_bbio; }
map_length = min(map_length, length); @@ -686,7 +690,15 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num) map_length = btrfs_append_map_length(bbio, map_length);
if (map_length < length) { - bbio = btrfs_split_bio(fs_info, bbio, map_length); + struct btrfs_bio *split; + + split = btrfs_split_bio(fs_info, bbio, map_length); + if (IS_ERR(split)) { + ret = errno_to_blk_status(PTR_ERR(split)); + btrfs_bio_counter_dec(fs_info); + goto end_bbio; + } + bbio = split; bio = &bbio->bio; }
@@ -760,6 +772,7 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
btrfs_bio_end_io(remaining, ret); } +end_bbio: btrfs_bio_end_io(bbio, ret); /* Do not submit another chunk */ return true;