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dm log writes: use memcpy_from_bvec in log_writes_map

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Use memcpy_from_bvec instead of open coding the logic.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Christoph Hellwig 2021-10-19 15:44:05 +02:00 committed by Mike Snitzer
parent 25058d1c72
commit 27db271708
1 changed files with 2 additions and 4 deletions
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6
drivers/md/dm-log-writes.c
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@ -753,7 +753,7 @@ static int log_writes_map(struct dm_target *ti, struct bio *bio)
*/
bio_for_each_segment(bv, bio, iter) {
struct page *page;
void *src, *dst;
void *dst;
page = alloc_page(GFP_NOIO);
if (!page) {
@ -765,11 +765,9 @@ static int log_writes_map(struct dm_target *ti, struct bio *bio)
return DM_MAPIO_KILL;
}
src = kmap_atomic(bv.bv_page);
dst = kmap_atomic(page);
memcpy(dst, src + bv.bv_offset, bv.bv_len);
memcpy_from_bvec(dst, &bv);
kunmap_atomic(dst);
kunmap_atomic(src);
block->vecs[i].bv_page = page;
block->vecs[i].bv_len = bv.bv_len;
block->vec_cnt++;