From ad5b0f7685dbfc4730987cd16af3c5ebe8133f10 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Tue, 30 Aug 2016 10:29:33 -0700 Subject: [PATCH] raid5: guarantee enough stripes to avoid reshape hang If there aren't enough stripes, reshape will hang. We have a check for this in new reshape, but miss it for reshape resume, hence we could see hang in reshape resume. This patch forces enough stripes existed if reshape resumes. Reviewed-by: NeilBrown Signed-off-by: Shaohua Li --- drivers/md/raid5.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index da583bb43c84..b95c54c0e596 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -6639,6 +6639,16 @@ static struct r5conf *setup_conf(struct mddev *mddev) } conf->min_nr_stripes = NR_STRIPES; + if (mddev->reshape_position != MaxSector) { + int stripes = max_t(int, + ((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4, + ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4); + conf->min_nr_stripes = max(NR_STRIPES, stripes); + if (conf->min_nr_stripes != NR_STRIPES) + printk(KERN_INFO + "md/raid:%s: force stripe size %d for reshape\n", + mdname(mddev), conf->min_nr_stripes); + } memory = conf->min_nr_stripes * (sizeof(struct stripe_head) + max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024; atomic_set(&conf->empty_inactive_list_nr, NR_STRIPE_HASH_LOCKS); -- 2.20.1