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| author | Kent Overstreet <koverstreet@google.com> | 2012-09-06 15:34:58 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-09-09 10:35:39 +0200 |
| commit | f44b48c7691be7643877d1f881b5eeace654d05d (patch) | |
| tree | a862b4844b99abfa1bfb6fd437cf1ee4f055c438 /include/linux/bio.h | |
| parent | 94818742316e27d01506240cf8b07d69844d31af (diff) | |
| download | linux-f44b48c7691be7643877d1f881b5eeace654d05d.tar.gz linux-f44b48c7691be7643877d1f881b5eeace654d05d.tar.bz2 linux-f44b48c7691be7643877d1f881b5eeace654d05d.zip | |
block: Add bio_reset()
Reusing bios is something that's been highly frowned upon in the past,
but driver code keeps doing it anyways. If it's going to happen anyways,
we should provide a generic method.
This'll help with getting rid of bi_destructor - drivers/block/pktcdvd.c
was open coding it, by doing a bio_init() and resetting bi_destructor.
This required reordering struct bio, but the block layer is not yet
nearly fast enough for any cacheline effects to matter here.
v5: Add a define BIO_RESET_BITS, to be very explicit about what parts of
bio->bi_flags are saved.
v6: Further commenting verbosity, per Tejun
v9: Add a function comment
Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/bio.h')
| -rw-r--r-- | include/linux/bio.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index a11f74bc82d2..76f6c252baff 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -226,6 +226,7 @@ extern void __bio_clone(struct bio *, struct bio *); extern struct bio *bio_clone(struct bio *, gfp_t); extern void bio_init(struct bio *); +extern void bio_reset(struct bio *); extern int bio_add_page(struct bio *, struct page *, unsigned int,unsigned int); extern int bio_add_pc_page(struct request_queue *, struct bio *, struct page *, |