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md/raid5: new alloc_stripe() to allocate an initialize a stripe. 

The new batch_lock and batch_list fields are being initialized in
grow_one_stripe() but not in resize_stripes().  This causes a crash
on resize.

So separate the core initialization into a new function and call it
from both allocation sites.

Signed-off-by: NeilBrown <neilb@suse.de>
Fixes: 59fc630b8b ("RAID5: batch adjacent full stripe write")
This commit is contained in:
NeilBrown 2015-05-08 18:19:04 +10:00
parent b6538fe329
commit f18c1a35f6
1 changed files with 18 additions and 14 deletions
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32
drivers/md/raid5.c
View File

@ -1971,17 +1971,30 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
put_cpu();
}
static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp)
{
struct stripe_head *sh;
sh = kmem_cache_zalloc(sc, gfp);
if (sh) {
spin_lock_init(&sh->stripe_lock);
spin_lock_init(&sh->batch_lock);
INIT_LIST_HEAD(&sh->batch_list);
INIT_LIST_HEAD(&sh->lru);
atomic_set(&sh->count, 1);
}
return sh;
}
static int grow_one_stripe(struct r5conf *conf, gfp_t gfp)
{
struct stripe_head *sh;
sh = kmem_cache_zalloc(conf->slab_cache, gfp);
sh = alloc_stripe(conf->slab_cache, gfp);
if (!sh)
return 0;
sh->raid_conf = conf;
spin_lock_init(&sh->stripe_lock);
if (grow_buffers(sh, gfp)) {
shrink_buffers(sh);
kmem_cache_free(conf->slab_cache, sh);
@ -1990,13 +2003,8 @@ static int grow_one_stripe(struct r5conf *conf, gfp_t gfp)
sh->hash_lock_index =
conf->max_nr_stripes % NR_STRIPE_HASH_LOCKS;
/* we just created an active stripe so... */
atomic_set(&sh->count, 1);
atomic_inc(&conf->active_stripes);
INIT_LIST_HEAD(&sh->lru);
spin_lock_init(&sh->batch_lock);
INIT_LIST_HEAD(&sh->batch_list);
sh->batch_head = NULL;
release_stripe(sh);
conf->max_nr_stripes++;
return 1;
@ -2109,13 +2117,11 @@ static int resize_stripes(struct r5conf *conf, int newsize)
return -ENOMEM;
for (i = conf->max_nr_stripes; i; i--) {
nsh = kmem_cache_zalloc(sc, GFP_KERNEL);
nsh = alloc_stripe(sc, GFP_KERNEL);
if (!nsh)
break;
nsh->raid_conf = conf;
spin_lock_init(&nsh->stripe_lock);
list_add(&nsh->lru, &newstripes);
}
if (i) {
@ -2142,13 +2148,11 @@ static int resize_stripes(struct r5conf *conf, int newsize)
lock_device_hash_lock(conf, hash));
osh = get_free_stripe(conf, hash);
unlock_device_hash_lock(conf, hash);
atomic_set(&nsh->count, 1);
for(i=0; i<conf->pool_size; i++) {
nsh->dev[i].page = osh->dev[i].page;
nsh->dev[i].orig_page = osh->dev[i].page;
}
for( ; i<newsize; i++)
nsh->dev[i].page = NULL;
nsh->hash_lock_index = hash;
kmem_cache_free(conf->slab_cache, osh);
cnt++;