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md: raid10: avoid direct access to bvec table in handle_reshape_read_error 

All reshape I/O share pages from 1st copy device, so just use that pages
for avoiding direct access to bvec table in handle_reshape_read_error.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Ming Lei 2017-03-17 00:12:35 +08:00 committed by Shaohua Li
parent cdb76be315
commit 2d06e3b714
1 changed files with 5 additions and 2 deletions
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7
drivers/md/raid10.c
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@ -4653,7 +4653,10 @@ static int handle_reshape_read_error(struct mddev *mddev,
struct r10bio *r10b = &on_stack.r10_bio;
int slot = 0;
int idx = 0;
struct bio_vec *bvec = r10_bio->master_bio->bi_io_vec;
struct page **pages;
/* reshape IOs share pages from .devs[0].bio */
pages = get_resync_pages(r10_bio->devs[0].bio)->pages;
r10b->sector = r10_bio->sector;
__raid10_find_phys(&conf->prev, r10b);
@ -4682,7 +4685,7 @@ static int handle_reshape_read_error(struct mddev *mddev,
success = sync_page_io(rdev,
addr,
s << 9,
bvec[idx].bv_page,
pages[idx],
REQ_OP_READ, 0, false);
rdev_dec_pending(rdev, mddev);
rcu_read_lock();