From: Yu Kuai yukuai3@huawei.com
[ Upstream commit 969d6589abcb369d53d84ec7c9c37f4b23ec1ad9 ]
There are no functional changes, just make code cleaner and prepare to record disk non-rotational information while adding and removing rdev to conf
Signed-off-by: Yu Kuai yukuai3@huawei.com Signed-off-by: Song Liu song@kernel.org Link: https://lore.kernel.org/r/20240229095714.926789-3-yukuai1@huaweicloud.com Stable-dep-of: 257ac239ffcf ("md/raid1: fix choose next idle in read_balance()") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/md/raid1.c | 85 +++++++++++++++++++++++++++++----------------- 1 file changed, 53 insertions(+), 32 deletions(-)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 71bd372c14e2c..57e2487a03507 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1761,6 +1761,44 @@ static int raid1_spare_active(struct mddev *mddev) return count; }
+static bool raid1_add_conf(struct r1conf *conf, struct md_rdev *rdev, int disk, + bool replacement) +{ + struct raid1_info *info = conf->mirrors + disk; + + if (replacement) + info += conf->raid_disks; + + if (info->rdev) + return false; + + rdev->raid_disk = disk; + info->head_position = 0; + info->seq_start = MaxSector; + WRITE_ONCE(info->rdev, rdev); + + return true; +} + +static bool raid1_remove_conf(struct r1conf *conf, int disk) +{ + struct raid1_info *info = conf->mirrors + disk; + struct md_rdev *rdev = info->rdev; + + if (!rdev || test_bit(In_sync, &rdev->flags) || + atomic_read(&rdev->nr_pending)) + return false; + + /* Only remove non-faulty devices if recovery is not possible. */ + if (!test_bit(Faulty, &rdev->flags) && + rdev->mddev->recovery_disabled != conf->recovery_disabled && + rdev->mddev->degraded < conf->raid_disks) + return false; + + WRITE_ONCE(info->rdev, NULL); + return true; +} + static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) { struct r1conf *conf = mddev->private; @@ -1796,15 +1834,13 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) disk_stack_limits(mddev->gendisk, rdev->bdev, rdev->data_offset << 9);
- p->head_position = 0; - rdev->raid_disk = mirror; + raid1_add_conf(conf, rdev, mirror, false); err = 0; /* As all devices are equivalent, we don't need a full recovery * if this was recently any drive of the array */ if (rdev->saved_raid_disk < 0) conf->fullsync = 1; - WRITE_ONCE(p->rdev, rdev); break; } if (test_bit(WantReplacement, &p->rdev->flags) && @@ -1814,13 +1850,11 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
if (err && repl_slot >= 0) { /* Add this device as a replacement */ - p = conf->mirrors + repl_slot; clear_bit(In_sync, &rdev->flags); set_bit(Replacement, &rdev->flags); - rdev->raid_disk = repl_slot; + raid1_add_conf(conf, rdev, repl_slot, true); err = 0; conf->fullsync = 1; - WRITE_ONCE(p[conf->raid_disks].rdev, rdev); }
print_conf(conf); @@ -1837,27 +1871,20 @@ static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) if (unlikely(number >= conf->raid_disks)) goto abort;
- if (rdev != p->rdev) - p = conf->mirrors + conf->raid_disks + number; + if (rdev != p->rdev) { + number += conf->raid_disks; + p = conf->mirrors + number; + }
print_conf(conf); if (rdev == p->rdev) { - if (test_bit(In_sync, &rdev->flags) || - atomic_read(&rdev->nr_pending)) { - err = -EBUSY; - goto abort; - } - /* Only remove non-faulty devices if recovery - * is not possible. - */ - if (!test_bit(Faulty, &rdev->flags) && - mddev->recovery_disabled != conf->recovery_disabled && - mddev->degraded < conf->raid_disks) { + if (!raid1_remove_conf(conf, number)) { err = -EBUSY; goto abort; } - WRITE_ONCE(p->rdev, NULL); - if (conf->mirrors[conf->raid_disks + number].rdev) { + + if (number < conf->raid_disks && + conf->mirrors[conf->raid_disks + number].rdev) { /* We just removed a device that is being replaced. * Move down the replacement. We drain all IO before * doing this to avoid confusion. @@ -3000,23 +3027,17 @@ static struct r1conf *setup_conf(struct mddev *mddev)
err = -EINVAL; spin_lock_init(&conf->device_lock); + conf->raid_disks = mddev->raid_disks; rdev_for_each(rdev, mddev) { int disk_idx = rdev->raid_disk; - if (disk_idx >= mddev->raid_disks - || disk_idx < 0) + + if (disk_idx >= conf->raid_disks || disk_idx < 0) continue; - if (test_bit(Replacement, &rdev->flags)) - disk = conf->mirrors + mddev->raid_disks + disk_idx; - else - disk = conf->mirrors + disk_idx;
- if (disk->rdev) + if (!raid1_add_conf(conf, rdev, disk_idx, + test_bit(Replacement, &rdev->flags))) goto abort; - disk->rdev = rdev; - disk->head_position = 0; - disk->seq_start = MaxSector; } - conf->raid_disks = mddev->raid_disks; conf->mddev = mddev; INIT_LIST_HEAD(&conf->retry_list); INIT_LIST_HEAD(&conf->bio_end_io_list);