From f4be6b43f1ac60dff00ef0923ee43b0e08872947 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Tue, 1 Jun 2010 19:37:25 +1000 Subject: [PATCH] md/raid5: ensure we create a unique name for kmem_cache when mddev has no gendisk We will shortly allow md devices with no gendisk (they are attached to a dm-target instead). That will cause mdname() to return 'mdX'. There is one place where mdname really needs to be unique: when creating the name for a slab cache. So in that case, if there is no gendisk, you the address of the mddev formatted in HEX to provide a unique name. Signed-off-by: NeilBrown --- drivers/md/raid5.c | 12 ++++++++---- drivers/md/raid5.h | 2 +- 2 files changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index bd4067a70834..6fa60e416a09 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -1337,10 +1337,14 @@ static int grow_stripes(raid5_conf_t *conf, int num) struct kmem_cache *sc; int devs = max(conf->raid_disks, conf->previous_raid_disks); - sprintf(conf->cache_name[0], - "raid%d-%s", conf->level, mdname(conf->mddev)); - sprintf(conf->cache_name[1], - "raid%d-%s-alt", conf->level, mdname(conf->mddev)); + if (conf->mddev->gendisk) + sprintf(conf->cache_name[0], + "raid%d-%s", conf->level, mdname(conf->mddev)); + else + sprintf(conf->cache_name[0], + "raid%d-%p", conf->level, conf->mddev); + sprintf(conf->cache_name[1], "%s-alt", conf->cache_name[0]); + conf->active_name = 0; sc = kmem_cache_create(conf->cache_name[conf->active_name], sizeof(struct stripe_head)+(devs-1)*sizeof(struct r5dev), diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index cbdbc77695b3..61b6b25dc5e7 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -388,7 +388,7 @@ struct raid5_private_data { * two caches. */ int active_name; - char cache_name[2][20]; + char cache_name[2][32]; struct kmem_cache *slab_cache; /* for allocating stripes */ int seq_flush, seq_write; -- 2.11.0