From: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
[ 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@xxxxxxxxxx>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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;
--
2.39.5
