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dm bufio: use multi-page bio vector

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The kernel supports multi page bio vector entries, so we can use them
in dm-bufio as an optimization.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mikulas Patocka 2023-03-21 10:18:10 -04:00 committed by Mike Snitzer
parent f5f9354120
commit 56c5de4406
1 changed files with 4 additions and 20 deletions
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24
drivers/md/dm-bufio.c
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@ -1312,19 +1312,14 @@ static void use_bio(struct dm_buffer *b, enum req_op op, sector_t sector,
{
struct bio *bio;
char *ptr;
unsigned int vec_size, len;
unsigned int len;
vec_size = b->c->block_size >> PAGE_SHIFT;
if (unlikely(b->c->sectors_per_block_bits < PAGE_SHIFT - SECTOR_SHIFT))
vec_size += 2;
bio = bio_kmalloc(vec_size, GFP_NOWAIT | __GFP_NORETRY | __GFP_NOWARN);
bio = bio_kmalloc(1, GFP_NOWAIT | __GFP_NORETRY | __GFP_NOWARN);
if (!bio) {
dmio:
use_dmio(b, op, sector, n_sectors, offset);
return;
}
bio_init(bio, b->c->bdev, bio->bi_inline_vecs, vec_size, op);
bio_init(bio, b->c->bdev, bio->bi_inline_vecs, 1, op);
bio->bi_iter.bi_sector = sector;
bio->bi_end_io = bio_complete;
bio->bi_private = b;
@ -1332,18 +1327,7 @@ static void use_bio(struct dm_buffer *b, enum req_op op, sector_t sector,
ptr = (char *)b->data + offset;
len = n_sectors << SECTOR_SHIFT;
do {
unsigned int this_step = min((unsigned int)(PAGE_SIZE - offset_in_page(ptr)), len);
if (!bio_add_page(bio, virt_to_page(ptr), this_step,
offset_in_page(ptr))) {
bio_put(bio);
goto dmio;
}
len -= this_step;
ptr += this_step;
} while (len > 0);
__bio_add_page(bio, virt_to_page(ptr), len, offset_in_page(ptr));
submit_bio(bio);
}