diff options
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index c23e408f7623..66690b40818e 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -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: |