From: Li Nan <linan122@xxxxxxxxxx> commit 59f8f0b54c8ffb4521f6bbd1cb6f4dfa5022e75e upstream. 'need_recover' and 'mrdev' are equivalent in raid10_sync_request(), and inc mrdev->nr_pending is unreasonable if don't need recovery. Replace 'need_recover' with 'mrdev', and only inc nr_pending when needed. Signed-off-by: Li Nan <linan122@xxxxxxxxxx> Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx> Signed-off-by: Song Liu <song@xxxxxxxxxx> Link: https://lore.kernel.org/r/20230527072218.2365857-3-linan666@xxxxxxxxxxxxxxx Cc: Hagar Gamal Halim <hagarhem@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/md/raid10.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3069,7 +3069,6 @@ static sector_t raid10_sync_request(stru sector_t sect; int must_sync; int any_working; - int need_recover = 0; struct raid10_info *mirror = &conf->mirrors[i]; struct md_rdev *mrdev, *mreplace; @@ -3077,14 +3076,13 @@ static sector_t raid10_sync_request(stru mrdev = rcu_dereference(mirror->rdev); mreplace = rcu_dereference(mirror->replacement); - if (mrdev != NULL && - !test_bit(Faulty, &mrdev->flags) && - !test_bit(In_sync, &mrdev->flags)) - need_recover = 1; + if (mrdev && (test_bit(Faulty, &mrdev->flags) || + test_bit(In_sync, &mrdev->flags))) + mrdev = NULL; if (mreplace && test_bit(Faulty, &mreplace->flags)) mreplace = NULL; - if (!need_recover && !mreplace) { + if (!mrdev && !mreplace) { rcu_read_unlock(); continue; } @@ -3118,7 +3116,8 @@ static sector_t raid10_sync_request(stru rcu_read_unlock(); continue; } - atomic_inc(&mrdev->nr_pending); + if (mrdev) + atomic_inc(&mrdev->nr_pending); if (mreplace) atomic_inc(&mreplace->nr_pending); rcu_read_unlock(); @@ -3205,7 +3204,7 @@ static sector_t raid10_sync_request(stru r10_bio->devs[1].devnum = i; r10_bio->devs[1].addr = to_addr; - if (need_recover) { + if (mrdev) { bio = r10_bio->devs[1].bio; bio->bi_next = biolist; biolist = bio; @@ -3250,7 +3249,7 @@ static sector_t raid10_sync_request(stru for (k = 0; k < conf->copies; k++) if (r10_bio->devs[k].devnum == i) break; - if (!test_bit(In_sync, + if (mrdev && !test_bit(In_sync, &mrdev->flags) && !rdev_set_badblocks( mrdev, @@ -3276,12 +3275,14 @@ static sector_t raid10_sync_request(stru if (rb2) atomic_dec(&rb2->remaining); r10_bio = rb2; - rdev_dec_pending(mrdev, mddev); + if (mrdev) + rdev_dec_pending(mrdev, mddev); if (mreplace) rdev_dec_pending(mreplace, mddev); break; } - rdev_dec_pending(mrdev, mddev); + if (mrdev) + rdev_dec_pending(mrdev, mddev); if (mreplace) rdev_dec_pending(mreplace, mddev); if (r10_bio->devs[0].bio->bi_opf & MD_FAILFAST) { Patches currently in stable-queue which might be from linan122@xxxxxxxxxx are queue-5.4/md-raid10-improve-code-of-mrdev-in-raid10_sync_request.patch
