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md/raid5: reallocate page array after setting new stripe_size

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When try to resize stripe_size, we also need to free old
shared page array and allocate new.

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Yufen Yu 2020-08-20 09:22:14 -04:00 committed by Song Liu
parent f16acaf328
commit 3891258443
1 changed files with 20 additions and 0 deletions
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20
drivers/md/raid5.c
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@ -6682,6 +6682,7 @@ raid5_store_stripe_size(struct mddev *mddev, const char *page, size_t len)
struct r5conf *conf;
unsigned long new;
int err;
int size;
if (len >= PAGE_SIZE)
return -EINVAL;
@ -6714,10 +6715,29 @@ raid5_store_stripe_size(struct mddev *mddev, const char *page, size_t len)
pr_debug("md/raid: change stripe_size from %lu to %lu\n",
conf->stripe_size, new);
if (mddev->sync_thread ||
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
mddev->reshape_position != MaxSector ||
mddev->sysfs_active) {
err = -EBUSY;
goto out_unlock;
}
mddev_suspend(mddev);
mutex_lock(&conf->cache_size_mutex);
size = conf->max_nr_stripes;
shrink_stripes(conf);
conf->stripe_size = new;
conf->stripe_shift = ilog2(new) - 9;
conf->stripe_sectors = new >> 9;
if (grow_stripes(conf, size)) {
pr_warn("md/raid:%s: couldn't allocate buffers\n",
mdname(mddev));
err = -ENOMEM;
}
mutex_unlock(&conf->cache_size_mutex);
mddev_resume(mddev);
out_unlock: