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authorKent Overstreet <koverstreet@google.com>2012-09-07 02:34:58 +0400
committerJens Axboe <axboe@kernel.dk>2012-09-09 12:35:39 +0400
commitf44b48c7691be7643877d1f881b5eeace654d05d (patch)
treea862b4844b99abfa1bfb6fd437cf1ee4f055c438 /include/linux/bio.h
parent94818742316e27d01506240cf8b07d69844d31af (diff)
downloadlinux-f44b48c7691be7643877d1f881b5eeace654d05d.tar.xz
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.h1
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 *,