From f90ae76a5c2c746c06f11a1709e9149ab2666ea4 Mon Sep 17 00:00:00 2001 From: Nikolay Borisov Date: Thu, 2 Jul 2020 16:46:42 +0300 Subject: [PATCH] btrfs: raid56: remove redundant device check in rbio_add_io_page The merging logic is always executed if the current stripe's device is not missing. So there's no point in duplicating the check. Simply remove it, while at it reduce the scope of the 'last_end' variable. If the current stripe's device is missing we fail the stripe early on. Reviewed-by: Johannes Thumshirn Signed-off-by: Nikolay Borisov Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/raid56.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c index 570f6bf..e493596 100644 --- a/fs/btrfs/raid56.c +++ b/fs/btrfs/raid56.c @@ -1083,7 +1083,6 @@ static int rbio_add_io_page(struct btrfs_raid_bio *rbio, unsigned long bio_max_len) { struct bio *last = bio_list->tail; - u64 last_end = 0; int ret; struct bio *bio; struct btrfs_bio_stripe *stripe; @@ -1098,15 +1097,14 @@ static int rbio_add_io_page(struct btrfs_raid_bio *rbio, /* see if we can add this page onto our existing bio */ if (last) { - last_end = (u64)last->bi_iter.bi_sector << 9; + u64 last_end = (u64)last->bi_iter.bi_sector << 9; last_end += last->bi_iter.bi_size; /* * we can't merge these if they are from different * devices or if they are not contiguous */ - if (last_end == disk_start && stripe->dev->bdev && - !last->bi_status && + if (last_end == disk_start && !last->bi_status && last->bi_disk == stripe->dev->bdev->bd_disk && last->bi_partno == stripe->dev->bdev->bd_partno) { ret = bio_add_page(last, page, PAGE_SIZE, 0); -- 2.7.4