This patch uses a stack variable to hold the pages in bio, so that we can remove direct access to bvec table in fix_sync_read_error(). This 16*8 stack variable is just fine for kernel thread context. Signed-off-by: Ming Lei <tom.leiming@xxxxxxxxx> --- drivers/md/raid1.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 1dd6b2760fba..02ee8542295d 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1874,6 +1874,16 @@ static int fix_sync_read_error(struct r1bio *r1_bio) int sectors = r1_bio->sectors; int idx = 0; struct md_rdev *rdev; + struct bio_vec *bvl; + int i; + struct page *pages[RESYNC_PAGES]; + + /* + * bio for read_disk is filled up, so we can use + * bio_for_each_segment_all() to retrieve all pages. + */ + bio_for_each_segment_all(bvl, bio, i) + pages[i] = bvl->bv_page; rdev = conf->mirrors[r1_bio->read_disk].rdev; if (test_bit(FailFast, &rdev->flags)) { @@ -1903,7 +1913,7 @@ static int fix_sync_read_error(struct r1bio *r1_bio) */ rdev = conf->mirrors[d].rdev; if (sync_page_io(rdev, sect, s<<9, - bio->bi_io_vec[idx].bv_page, + pages[idx], REQ_OP_READ, 0, false)) { success = 1; break; @@ -1958,7 +1968,7 @@ static int fix_sync_read_error(struct r1bio *r1_bio) continue; rdev = conf->mirrors[d].rdev; if (r1_sync_page_io(rdev, sect, s, - bio->bi_io_vec[idx].bv_page, + pages[idx], WRITE) == 0) { r1_bio->bios[d]->bi_end_io = NULL; rdev_dec_pending(rdev, mddev); @@ -1973,7 +1983,7 @@ static int fix_sync_read_error(struct r1bio *r1_bio) continue; rdev = conf->mirrors[d].rdev; if (r1_sync_page_io(rdev, sect, s, - bio->bi_io_vec[idx].bv_page, + pages[idx], READ) != 0) atomic_add(s, &rdev->corrected_errors); } -- 2.7.4