The cost is 128bytes(8*16) stack space in kernel thread context, and just use the bio helper to retrieve pages from bio. Signed-off-by: Ming Lei <tom.leiming@xxxxxxxxx> --- drivers/md/raid10.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index ae162d542bf4..705cb9af03ef 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -4689,7 +4689,15 @@ 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 bio_vec *bvl; + struct page *pages[RESYNC_PAGES]; + + /* + * This bio is allocated in reshape_request(), and size + * is still RESYNC_PAGES + */ + bio_for_each_segment_all(bvl, r10_bio->master_bio, idx) + pages[idx] = bvl->bv_page; r10b->sector = r10_bio->sector; __raid10_find_phys(&conf->prev, r10b); @@ -4718,7 +4726,7 @@ 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(); -- 2.7.4
