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>

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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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drivers/md/raid1.c

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