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md/raid1: skip data copy for behind io for discard request

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discard request doesn't have data attached, so it's meaningless to
allocate memory and copy from original bio for behind IO. And the copy
is bogus because bio_copy_data_partial can't handle discard request.

We don't support writesame/writezeros request so far.

Reviewed-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Shaohua Li 2017-03-24 15:20:47 -07:00
parent f45958756f
commit 41743c1f04
1 changed files with 5 additions and 1 deletions
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6
drivers/md/raid1.c
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@ -1102,6 +1102,10 @@ static struct bio *alloc_behind_master_bio(struct r1bio *r1_bio,
if (!behind_bio)
goto fail;
/* discard op, we don't support writezero/writesame yet */
if (!bio_has_data(bio))
goto skip_copy;
while (i < vcnt && size) {
struct page *page;
int len = min_t(int, PAGE_SIZE, size);
@ -1118,7 +1122,7 @@ static struct bio *alloc_behind_master_bio(struct r1bio *r1_bio,
bio_copy_data_partial(behind_bio, bio, offset,
behind_bio->bi_iter.bi_size);
skip_copy:
r1_bio->behind_master_bio = behind_bio;;
set_bit(R1BIO_BehindIO, &r1_bio->state);