diff options
author | Kent Overstreet <kmo@daterainc.com> | 2013-11-23 18:21:01 -0800 |
---|---|---|
committer | Kent Overstreet <kmo@daterainc.com> | 2013-11-23 22:33:57 -0800 |
commit | 20d0189b1012a37d2533a87fb451f7852f2418d1 (patch) | |
tree | 5ceaa6cfc0e1f1cec423c6c9f5de72d49f2d63a1 /include/linux | |
parent | ee67891bf132612feb7b999ee1f3350b40867cb4 (diff) |
block: Introduce new bio_split()
The new bio_split() can split arbitrary bios - it's not restricted to
single page bios, like the old bio_split() (previously renamed to
bio_pair_split()). It also has different semantics - it doesn't allocate
a struct bio_pair, leaving it up to the caller to handle completions.
Then convert the existing bio_pair_split() users to the new bio_split()
- and also nvme, which was open coding bio splitting.
(We have to take that BUG_ON() out of bio_integrity_trim() because this
bio_split() needs to use it, and there's no reason it has to be used on
bios marked as cloned; BIO_CLONED doesn't seem to have clearly
documented semantics anyways.)
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Neil Brown <neilb@suse.de>
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/bio.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index aa67af0b31ac..19e31b2f5b2c 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -321,6 +321,28 @@ extern struct bio_pair *bio_pair_split(struct bio *bi, int first_sectors); extern void bio_pair_release(struct bio_pair *dbio); extern void bio_trim(struct bio *bio, int offset, int size); +extern struct bio *bio_split(struct bio *bio, int sectors, + gfp_t gfp, struct bio_set *bs); + +/** + * bio_next_split - get next @sectors from a bio, splitting if necessary + * @bio: bio to split + * @sectors: number of sectors to split from the front of @bio + * @gfp: gfp mask + * @bs: bio set to allocate from + * + * Returns a bio representing the next @sectors of @bio - if the bio is smaller + * than @sectors, returns the original bio unchanged. + */ +static inline struct bio *bio_next_split(struct bio *bio, int sectors, + gfp_t gfp, struct bio_set *bs) +{ + if (sectors >= bio_sectors(bio)) + return bio; + + return bio_split(bio, sectors, gfp, bs); +} + extern struct bio_set *bioset_create(unsigned int, unsigned int); extern void bioset_free(struct bio_set *); extern mempool_t *biovec_create_pool(struct bio_set *bs, int pool_entries); |