When try to resize stripe_size, we also need to free old
shared page array and allocate new.
Signed-off-by: Yufen Yu <yuyufen@xxxxxxxxxx>
---
drivers/md/raid5.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 265d1c22309b..7770b2e1248b 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6680,6 +6680,7 @@ 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;
@@ -6709,10 +6710,29 @@ 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:
--
2.25.4
