From f109207629552cb04c2a48e90abe7c481e363984 Mon Sep 17 00:00:00 2001 From: Yu Kuai Date: Thu, 29 Feb 2024 17:57:09 +0800 Subject: md/raid1-10: factor out a new helper raid1_should_read_first() If resync is in progress, read_balance() should find the first usable disk, otherwise, data could be inconsistent after resync is done. raid1 and raid10 implement the same checking, hence factor out the checking to make code cleaner. Noted that raid1 is using 'mddev->recovery_cp', which is updated after all resync IO is done, while raid10 is using 'conf->next_resync', which is inaccurate because raid10 update it before submitting resync IO. Fortunately, raid10 read IO can't concurrent with resync IO, hence there is no problem. And this patch also switch raid10 to use 'mddev->recovery_cp'. Co-developed-by: Paul Luse Signed-off-by: Paul Luse Signed-off-by: Yu Kuai Reviewed-by: Xiao Ni Signed-off-by: Song Liu Link: https://lore.kernel.org/r/20240229095714.926789-7-yukuai1@huaweicloud.com --- drivers/md/raid1-10.c | 20 ++++++++++++++++++++ drivers/md/raid1.c | 15 ++------------- drivers/md/raid10.c | 13 ++----------- 3 files changed, 24 insertions(+), 24 deletions(-) (limited to 'drivers/md') diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c index 9bc0f0022a6c..2ea1710a3b70 100644 --- a/drivers/md/raid1-10.c +++ b/drivers/md/raid1-10.c @@ -276,3 +276,23 @@ static inline int raid1_check_read_range(struct md_rdev *rdev, *len = first_bad + bad_sectors - this_sector; return 0; } + +/* + * Check if read should choose the first rdev. + * + * Balance on the whole device if no resync is going on (recovery is ok) or + * below the resync window. Otherwise, take the first readable disk. + */ +static inline bool raid1_should_read_first(struct mddev *mddev, + sector_t this_sector, int len) +{ + if ((mddev->recovery_cp < this_sector + len)) + return true; + + if (mddev_is_clustered(mddev) && + md_cluster_ops->area_resyncing(mddev, READ, this_sector, + this_sector + len)) + return true; + + return false; +} diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index fa86d9fdb16f..30f467bb48fd 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -605,11 +605,6 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect struct md_rdev *rdev; int choose_first; - /* - * Check if we can balance. We can balance on the whole - * device if no resync is going on, or below the resync window. - * We take the first readable disk when above the resync window. - */ retry: sectors = r1_bio->sectors; best_disk = -1; @@ -619,16 +614,10 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect best_pending_disk = -1; min_pending = UINT_MAX; best_good_sectors = 0; + choose_first = raid1_should_read_first(conf->mddev, this_sector, + sectors); clear_bit(R1BIO_FailFast, &r1_bio->state); - if ((conf->mddev->recovery_cp < this_sector + sectors) || - (mddev_is_clustered(conf->mddev) && - md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, - this_sector + sectors))) - choose_first = 1; - else - choose_first = 0; - for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { sector_t dist; sector_t first_bad; diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index d5a7a621f0f0..8aecdb1ccc16 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -748,17 +748,8 @@ static struct md_rdev *read_balance(struct r10conf *conf, best_good_sectors = 0; do_balance = 1; clear_bit(R10BIO_FailFast, &r10_bio->state); - /* - * Check if we can balance. We can balance on the whole - * device if no resync is going on (recovery is ok), or below - * the resync window. We take the first readable disk when - * above the resync window. - */ - if ((conf->mddev->recovery_cp < MaxSector - && (this_sector + sectors >= conf->next_resync)) || - (mddev_is_clustered(conf->mddev) && - md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, - this_sector + sectors))) + + if (raid1_should_read_first(conf->mddev, this_sector, sectors)) do_balance = 0; for (slot = 0; slot < conf->copies ; slot++) { -- cgit v1.2.3