On 06/26/2017 08:09 PM, Ming Lei wrote:
We will support multipage bvec soon, so initialize bvec table using the standardy way instead of writing the talbe directly. Otherwise it won't work any more once multipage bvec is enabled. Cc: Shaohua Li <shli@xxxxxxxxxx> Cc: linux-raid@xxxxxxxxxxxxxxx Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx> --- drivers/md/raid1.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 3febfc8391fb..835c42396861 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -2086,10 +2086,8 @@ static void process_checks(struct r1bio *r1_bio) /* Fix variable parts of all bios */ vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); for (i = 0; i < conf->raid_disks * 2; i++) { - int j; int size; blk_status_t status; - struct bio_vec *bi; struct bio *b = r1_bio->bios[i]; struct resync_pages *rp = get_resync_pages(b); if (b->bi_end_io != end_sync_read) @@ -2098,8 +2096,6 @@ static void process_checks(struct r1bio *r1_bio) status = b->bi_status; bio_reset(b); b->bi_status = status; - b->bi_vcnt = vcnt; - b->bi_iter.bi_size = r1_bio->sectors << 9; b->bi_iter.bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset; b->bi_bdev = conf->mirrors[i].rdev->bdev; @@ -2107,15 +2103,20 @@ static void process_checks(struct r1bio *r1_bio) rp->raid_bio = r1_bio; b->bi_private = rp;- size = b->bi_iter.bi_size;- bio_for_each_segment_all(bi, b, j) { - bi->bv_offset = 0; - if (size > PAGE_SIZE) - bi->bv_len = PAGE_SIZE; - else - bi->bv_len = size; - size -= PAGE_SIZE; - } + /* initialize bvec table again */ + rp->idx = 0; + size = r1_bio->sectors << 9; + do { + struct page *page = resync_fetch_page(rp, rp->idx++); + int len = min_t(int, size, PAGE_SIZE); + + /* + * won't fail because the vec table is big + * enough to hold all these pages + */ + bio_add_page(b, page, len, 0); + size -= len; + } while (rp->idx < RESYNC_PAGES && size > 0); }
Seems above section is similar as reset_bvec_table introduced in next patch, why there is difference between raid1 and raid10? Maybe add reset_bvec_table into md.c, then call it in raid1 or raid10 is better, just my 2 cents. Thanks, Guoqing -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
