5.15-stable review patch. If anyone has any objections, please let me know.
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From: Li Nan linan122@huawei.com
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@huawei.com Reviewed-by: Yu Kuai yukuai3@huawei.com Signed-off-by: Song Liu song@kernel.org Link: https://lore.kernel.org/r/20230527072218.2365857-3-linan666@huaweicloud.com Cc: Hagar Gamal Halim hagarhem@amazon.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/raid10.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-)
--- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3443,7 +3443,6 @@ 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;
@@ -3451,14 +3450,13 @@ 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; } @@ -3492,7 +3490,8 @@ 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(); @@ -3579,7 +3578,7 @@ 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; @@ -3624,7 +3623,7 @@ 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, @@ -3650,12 +3649,14 @@ 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) {