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block: Rework bio_split() return value

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Instead of returning an inconclusive value of NULL for an error in calling
bio_split(), return a ERR_PTR() always.

Also remove the BUG_ON() calls, and WARN_ON_ONCE() instead. Indeed, since
almost all callers don't check the return code from bio_split(), we'll
crash anyway (for those failures).

Fix up the only user which checks bio_split() return code today (directly
or indirectly), blk_crypto_fallback_split_bio_if_needed(). The md/bcache
code does check the return code in cached_dev_cache_miss() ->
bio_next_split() -> bio_split(), but only to see if there was a split, so
there would be no change in behaviour here (when returning a ERR_PTR()).

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20241111112150.3756529-2-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
John Garry 2024-11-11 11:21:45 +00:00 committed by Jens Axboe
parent d369735e02
commit e546fe1da9
2 changed files with 7 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

10
block/bio.c
View file

@ -1665,16 +1665,18 @@ struct bio *bio_split(struct bio *bio, int sectors,
{ {
struct bio *split; struct bio *split;
BUG_ON(sectors <= 0); if (WARN_ON_ONCE(sectors <= 0))
BUG_ON(sectors >= bio_sectors(bio)); return ERR_PTR(-EINVAL);
if (WARN_ON_ONCE(sectors >= bio_sectors(bio)))
return ERR_PTR(-EINVAL);
/* Zone append commands cannot be split */ /* Zone append commands cannot be split */
if (WARN_ON_ONCE(bio_op(bio) == REQ_OP_ZONE_APPEND)) if (WARN_ON_ONCE(bio_op(bio) == REQ_OP_ZONE_APPEND))
return NULL; return ERR_PTR(-EINVAL);
split = bio_alloc_clone(bio->bi_bdev, bio, gfp, bs); split = bio_alloc_clone(bio->bi_bdev, bio, gfp, bs);
if (!split) if (!split)
return NULL; return ERR_PTR(-ENOMEM);
split->bi_iter.bi_size = sectors << 9; split->bi_iter.bi_size = sectors << 9;

2
block/blk-crypto-fallback.c
View file

@ -226,7 +226,7 @@ static bool blk_crypto_fallback_split_bio_if_needed(struct bio **bio_ptr)
split_bio = bio_split(bio, num_sectors, GFP_NOIO, split_bio = bio_split(bio, num_sectors, GFP_NOIO,
&crypto_bio_split); &crypto_bio_split);
if (!split_bio) { if (IS_ERR(split_bio)) {
bio->bi_status = BLK_STS_RESOURCE; bio->bi_status = BLK_STS_RESOURCE;
return false; return false;
} }