diff options
| author | Christoph Hellwig <hch@lst.de> | 2026-01-14 14:06:41 +0100 |
|---|---|---|
| committer | Carlos Maiolino <cem@kernel.org> | 2026-01-21 12:57:16 +0100 |
| commit | 7ca44303f9f6160a2f87ae3d5d2326d9127cd61c (patch) | |
| tree | 086776d9211d63edff93e02143681cd8ecffddd8 /block | |
| parent | cf9b52fa7d65362b648927d1d752ec99659f5c43 (diff) | |
| download | ath-7ca44303f9f6160a2f87ae3d5d2326d9127cd61c.tar.gz | |
block: add a bio_reuse helper
Add a helper to allow an existing bio to be resubmitted without
having to re-add the payload.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Hans Holmberg <hans.holmberg@wdc.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bio.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c index e726c0e280a8d..40f690985bfb6 100644 --- a/block/bio.c +++ b/block/bio.c @@ -311,6 +311,40 @@ void bio_reset(struct bio *bio, struct block_device *bdev, blk_opf_t opf) } EXPORT_SYMBOL(bio_reset); +/** + * bio_reuse - reuse a bio with the payload left intact + * @bio: bio to reuse + * @opf: operation and flags for the next I/O + * + * Allow reusing an existing bio for another operation with all set up + * fields including the payload, device and end_io handler left intact. + * + * Typically used when @bio is first used to read data which is then written + * to another location without modification. @bio must not be in-flight and + * owned by the caller. Can't be used for cloned bios. + * + * Note: Can't be used when @bio has integrity or blk-crypto contexts for now. + * Feel free to add that support when you need it, though. + */ +void bio_reuse(struct bio *bio, blk_opf_t opf) +{ + unsigned short vcnt = bio->bi_vcnt, i; + bio_end_io_t *end_io = bio->bi_end_io; + void *private = bio->bi_private; + + WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)); + WARN_ON_ONCE(bio_integrity(bio)); + WARN_ON_ONCE(bio_has_crypt_ctx(bio)); + + bio_reset(bio, bio->bi_bdev, opf); + for (i = 0; i < vcnt; i++) + bio->bi_iter.bi_size += bio->bi_io_vec[i].bv_len; + bio->bi_vcnt = vcnt; + bio->bi_private = private; + bio->bi_end_io = end_io; +} +EXPORT_SYMBOL_GPL(bio_reuse); + static struct bio *__bio_chain_endio(struct bio *bio) { struct bio *parent = bio->bi_private; |