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dm crypt: use bio_add_page() 

Use bio_add_page(), the standard interface for adding a page to a bio,
rather than open-coding the same.

It should be noted that the 'clone' bio that is allocated using
bio_alloc_bioset(), in crypt_alloc_buffer(), does _not_ set the
bio's BIO_CLONED flag.  As such, bio_add_page()'s early return for true
bio clones (those with BIO_CLONED set) isn't applicable.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Ming Lei 2016-10-29 16:08:06 +08:00 committed by Mike Snitzer
parent cacc7b0556
commit 0dae7fe597
1 changed files with 1 additions and 7 deletions
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8
drivers/md/dm-crypt.c
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@ -994,7 +994,6 @@ static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size)
gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM; gfp_t gfp_mask = GFP_NOWAIT | __GFP_HIGHMEM;
unsigned i, len, remaining_size; unsigned i, len, remaining_size;
struct page *page; struct page *page;
struct bio_vec *bvec;
retry: retry:
if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM)) if (unlikely(gfp_mask & __GFP_DIRECT_RECLAIM))
@ -1019,12 +1018,7 @@ retry:
len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size; len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
bvec = &clone->bi_io_vec[clone->bi_vcnt++]; bio_add_page(clone, page, len, 0);
bvec->bv_page = page;
bvec->bv_len = len;
bvec->bv_offset = 0;
clone->bi_iter.bi_size += len;
remaining_size -= len; remaining_size -= len;
} }