[PATCH v3] btrfs: handle bio_split() error

[Johannes Thumshirn <jth@kernel.org>]

From: Johannes Thumshirn <johannes.thumshirn@wdc.com>

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@wdc.com>
---

This is based on top of John Garry's series "bio_split() error handling
rework" explicitly on the patch titled "block: Rework bio_split() return
value", which are as of now (Tue Oct 29 10:02:16 2024) not yet merged into
any tree.

Changes to v2:
- assign the split bbio to a new variable, so we can keep the old error
  paths and end the original bbio

Changes to v1:
- convert ERR_PTR to blk_status_t
- correctly fail already split bbios
---
 fs/btrfs/bio.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/bio.c b/fs/btrfs/bio.c
index 1f216d07eff6..7a0998d0abe3 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 +681,7 @@ 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;
+		goto end_bbio;
 	}
 
 	map_length = min(map_length, length);
@@ -686,7 +689,14 @@ 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));
+			goto end_bbio;
+		}
+		bbio = split;
 		bio = &bbio->bio;
 	}
 
@@ -760,6 +770,7 @@ 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;
-- 
2.43.0