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md: fast clone bio in bio_clone_mddev()

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Firstly bio_clone_mddev() is used in raid normal I/O and isn't
in resync I/O path.

Secondly all the direct access to bvec table in raid happens on
resync I/O except for write behind of raid1, in which we still
use bio_clone() for allocating new bvec table.

So this patch replaces bio_clone() with bio_clone_fast()
in bio_clone_mddev().

Also kill bio_clone_mddev() and call bio_clone_fast() directly, as
suggested by Christoph Hellwig.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Ming Lei 2017-02-14 23:29:03 +08:00 committed by Shaohua Li
parent ed7ef732ca
commit d7a1030839
6 changed files with 14 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/md/faulty.c
View File

@ -214,7 +214,7 @@ static void faulty_make_request(struct mddev *mddev, struct bio *bio)
}
}
if (failit) {
struct bio *b = bio_clone_mddev(bio, GFP_NOIO, mddev);
struct bio *b = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set);
b->bi_bdev = conf->rdev->bdev;
b->bi_private = bio;

7
drivers/md/md.c
View File

@ -190,13 +190,6 @@ struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
}
EXPORT_SYMBOL_GPL(bio_alloc_mddev);
struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
struct mddev *mddev)
{
return bio_clone_bioset(bio, gfp_mask, mddev->bio_set);
}
EXPORT_SYMBOL_GPL(bio_clone_mddev);
/*
* We have a system wide 'event count' that is incremented
* on any 'interesting' event, and readers of /proc/mdstat

2
drivers/md/md.h
View File

@ -673,8 +673,6 @@ extern void md_rdev_clear(struct md_rdev *rdev);
extern void mddev_suspend(struct mddev *mddev);
extern void mddev_resume(struct mddev *mddev);
extern struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
struct mddev *mddev);
extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
struct mddev *mddev);

10
drivers/md/raid1.c
View File

@ -1108,7 +1108,7 @@ read_again:
r1_bio->read_disk = rdisk;
r1_bio->start_next_window = 0;
read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
read_bio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set);
bio_trim(read_bio, r1_bio->sector - bio->bi_iter.bi_sector,
max_sectors);
@ -1376,7 +1376,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
}
if (!mbio) {
mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set);
bio_trim(mbio, offset, max_sectors);
}
@ -2286,7 +2286,8 @@ static int narrow_write_error(struct r1bio *r1_bio, int i)
wbio->bi_vcnt = vcnt;
} else {
wbio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev);
wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO,
mddev->bio_set);
}
bio_set_op_attrs(wbio, REQ_OP_WRITE, 0);
@ -2424,7 +2425,8 @@ read_more:
const unsigned long do_sync
= r1_bio->master_bio->bi_opf & REQ_SYNC;
r1_bio->read_disk = disk;
bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev);
bio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO,
mddev->bio_set);
bio_trim(bio, r1_bio->sector - bio->bi_iter.bi_sector,
max_sectors);
r1_bio->bios[r1_bio->read_disk] = bio;

11
drivers/md/raid10.c
View File

@ -1132,7 +1132,7 @@ read_again:
}
slot = r10_bio->read_slot;
read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
read_bio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set);
bio_trim(read_bio, r10_bio->sector - bio->bi_iter.bi_sector,
max_sectors);
@ -1406,7 +1406,7 @@ retry_write:
int d = r10_bio->devs[i].devnum;
if (r10_bio->devs[i].bio) {
struct md_rdev *rdev = conf->mirrors[d].rdev;
mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set);
bio_trim(mbio, r10_bio->sector - bio->bi_iter.bi_sector,
max_sectors);
r10_bio->devs[i].bio = mbio;
@ -1457,7 +1457,7 @@ retry_write:
smp_mb();
rdev = conf->mirrors[d].rdev;
}
mbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set);
bio_trim(mbio, r10_bio->sector - bio->bi_iter.bi_sector,
max_sectors);
r10_bio->devs[i].repl_bio = mbio;
@ -2565,7 +2565,7 @@ static int narrow_write_error(struct r10bio *r10_bio, int i)
if (sectors > sect_to_write)
sectors = sect_to_write;
/* Write at 'sector' for 'sectors' */
wbio = bio_clone_mddev(bio, GFP_NOIO, mddev);
wbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set);
bio_trim(wbio, sector - bio->bi_iter.bi_sector, sectors);
wsector = r10_bio->devs[i].addr + (sector - r10_bio->sector);
wbio->bi_iter.bi_sector = wsector +
@ -2641,8 +2641,7 @@ read_more:
mdname(mddev),
bdevname(rdev->bdev, b),
(unsigned long long)r10_bio->sector);
bio = bio_clone_mddev(r10_bio->master_bio,
GFP_NOIO, mddev);
bio = bio_clone_fast(r10_bio->master_bio, GFP_NOIO, mddev->bio_set);
bio_trim(bio, r10_bio->sector - bio->bi_iter.bi_sector, max_sectors);
r10_bio->devs[slot].bio = bio;
r10_bio->devs[slot].rdev = rdev;

4
drivers/md/raid5.c
View File

@ -5056,9 +5056,9 @@ static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio)
return 0;
}
/*
* use bio_clone_mddev to make a copy of the bio
* use bio_clone_fast to make a copy of the bio
*/
align_bi = bio_clone_mddev(raid_bio, GFP_NOIO, mddev);
align_bi = bio_clone_fast(raid_bio, GFP_NOIO, mddev->bio_set);
if (!align_bi)
return 0;
/*