xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

block: Add bio_clone_fast()

Browse Source 
bio_clone() just got more expensive - however, most users of bio_clone()
don't actually need to modify the biovec. If they aren't modifying the
biovec, and they can guarantee that the original bio isn't freed before
the clone (also true in most cases), we can just point the clone at the
original bio's biovec.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Kent Overstreet
2013-11-23 18:19:27 -08:00
parent bdb5320741
commit 59d276fe02
3 changed files with 64 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/md/bcache/request.c
View File

@@ -613,7 +613,6 @@ struct search {
struct btree_op op;
struct data_insert_op iop;
struct bio_vec bv[BIO_MAX_PAGES];
};
static void bch_cache_read_endio(struct bio *bio, int error)
@@ -761,9 +760,7 @@ static void do_bio_hook(struct search *s)
struct bio *bio = &s->bio.bio;
bio_init(bio);
bio->bi_io_vec = s->bv;
bio->bi_max_vecs = BIO_MAX_PAGES;
__bio_clone(bio, s->orig_bio);
__bio_clone_fast(bio, s->orig_bio);
bio->bi_end_io = request_endio;
bio->bi_private = &s->cl;
@@ -1065,8 +1062,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
closure_bio_submit(flush, cl, s->d);
}
} else {
s->iop.bio = bio_clone_bioset(bio, GFP_NOIO,
dc->disk.bio_split);
s->iop.bio = bio_clone_fast(bio, GFP_NOIO, dc->disk.bio_split);
closure_bio_submit(bio, cl, s->d);
}