Re: [PATCH v2 2/4] md/raid10: improve code of mrdev in raid10_sync_request
From: Yu Kuai <hidden>
Date: 2023-05-27 01:41:24
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在 2023/05/26 15:45, linan666@huaweicloud.com 写道:
From: Li Nan <redacted> '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.
LGTM, feel free to add: Reviewed-by: Yu Kuai <redacted>
quoted hunk ↗ jump to hunk
Suggested-by: Yu Kuai <redacted> Signed-off-by: Li Nan <redacted> --- drivers/md/raid10.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-)diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index e21502c03b45..9de9eabff209 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c@@ -3437,7 +3437,6 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, 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;@@ -3446,14 +3445,14 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, mreplace = rcu_dereference(mirror->replacement); if (mrdev != NULL && - !test_bit(Faulty, &mrdev->flags) && - !test_bit(In_sync, &mrdev->flags)) - need_recover = 1; + (test_bit(Faulty, &mrdev->flags) || + test_bit(In_sync, &mrdev->flags))) + mrdev = NULL; if (mreplace != NULL && test_bit(Faulty, &mreplace->flags)) mreplace = NULL; - if (!need_recover && !mreplace) { + if (!mrdev && !mreplace) { rcu_read_unlock(); continue; }@@ -3487,7 +3486,8 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, 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();@@ -3574,7 +3574,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, 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;@@ -3619,7 +3619,7 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, 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,@@ -3645,12 +3645,14 @@ static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr, 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) {