[PATCH] btrfs: handle bio_split() error

[Johannes Thumshirn]

From: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>

Now that bio_split() can return errors, add error handling for it in
btrfs_split_bio() and ultimately btrfs_submit_chunk().

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
---

John,
in case you have to send a v3, can you please include this one in your series?

 fs/btrfs/bio.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/btrfs/bio.c b/fs/btrfs/bio.c
index 1f216d07eff6..96cacd5c03a5 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;
@@ -687,6 +690,10 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
 
 	if (map_length < length) {
 		bbio = btrfs_split_bio(fs_info, bbio, map_length);
+		if (IS_ERR(bbio)) {
+			ret = PTR_ERR(bbio);
+			goto fail;
+		}
 		bio = &bbio->bio;
 	}
 
-- 
2.43.0