md/raid5: factor out code for changing size of stripe cache.
Separate the actual 'change' code from the sysfs interface
so that it can eventually be called internally.
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 6a7a301..bd4067a 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4566,6 +4566,32 @@
return 0;
}
+int
+raid5_set_cache_size(mddev_t *mddev, int size)
+{
+ raid5_conf_t *conf = mddev->private;
+ int err;
+
+ if (size <= 16 || size > 32768)
+ return -EINVAL;
+ while (size < conf->max_nr_stripes) {
+ if (drop_one_stripe(conf))
+ conf->max_nr_stripes--;
+ else
+ break;
+ }
+ err = md_allow_write(mddev);
+ if (err)
+ return err;
+ while (size > conf->max_nr_stripes) {
+ if (grow_one_stripe(conf))
+ conf->max_nr_stripes++;
+ else break;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(raid5_set_cache_size);
+
static ssize_t
raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len)
{
@@ -4580,22 +4606,9 @@
if (strict_strtoul(page, 10, &new))
return -EINVAL;
- if (new <= 16 || new > 32768)
- return -EINVAL;
- while (new < conf->max_nr_stripes) {
- if (drop_one_stripe(conf))
- conf->max_nr_stripes--;
- else
- break;
- }
- err = md_allow_write(mddev);
+ err = raid5_set_cache_size(mddev, new);
if (err)
return err;
- while (new > conf->max_nr_stripes) {
- if (grow_one_stripe(conf))
- conf->max_nr_stripes++;
- else break;
- }
return len;
}
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 0f86f5e..cbdbc77 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -497,4 +497,5 @@
{
return layout >= 8 && layout <= 10;
}
+extern int raid5_set_cache_size(mddev_t *mddev, int size);
#endif