md: raid5: check stripe cache is large enough in start_reshape

In reshape cases that do not change the number of devices,
start_reshape is called without first calling check_reshape.

Currently, the check that the stripe_cache is large enough is
only done in check_reshape.  It should be in start_reshape too.

Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 0093441..b84766e 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4845,6 +4845,29 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
        return 0;
 }
 
+static int check_stripe_cache(mddev_t *mddev)
+{
+       /* Can only proceed if there are plenty of stripe_heads.
+        * We need a minimum of one full stripe,, and for sensible progress
+        * it is best to have about 4 times that.
+        * If we require 4 times, then the default 256 4K stripe_heads will
+        * allow for chunk sizes up to 256K, which is probably OK.
+        * If the chunk size is greater, user-space should request more
+        * stripe_heads first.
+        */
+       raid5_conf_t *conf = mddev->private;
+       if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4
+           > conf->max_nr_stripes ||
+           ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4
+           > conf->max_nr_stripes) {
+               printk(KERN_WARNING "raid5: reshape: not enough stripes.  Needed %lu\n",
+                      ((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9)
+                       / STRIPE_SIZE)*4);
+               return 0;
+       }
+       return 1;
+}
+
 static int raid5_check_reshape(mddev_t *mddev)
 {
        raid5_conf_t *conf = mddev->private;
@@ -4871,24 +4894,8 @@ static int raid5_check_reshape(mddev_t *mddev)
                        return -EINVAL;
        }
 
-       /* Can only proceed if there are plenty of stripe_heads.
-        * We need a minimum of one full stripe,, and for sensible progress
-        * it is best to have about 4 times that.
-        * If we require 4 times, then the default 256 4K stripe_heads will
-        * allow for chunk sizes up to 256K, which is probably OK.
-        * If the chunk size is greater, user-space should request more
-        * stripe_heads first.
-        */
-       if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4
-               > conf->max_nr_stripes ||
-           ((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4
-               > conf->max_nr_stripes) {
-               printk(KERN_WARNING "raid5: reshape: not enough stripes.  Needed %lu\n",
-                      (max(mddev->chunk_sectors << 9,
-                       mddev->new_chunk_sectors << 9)
-                       / STRIPE_SIZE)*4);
+       if (!check_stripe_cache(mddev))
                return -ENOSPC;
-       }
 
        return resize_stripes(conf, conf->raid_disks + mddev->delta_disks);
 }
@@ -4904,6 +4911,9 @@ static int raid5_start_reshape(mddev_t *mddev)
        if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
                return -EBUSY;
 
+       if (!check_stripe_cache(mddev))
+               return -ENOSPC;
+
        list_for_each_entry(rdev, &mddev->disks, same_set)
                if (rdev->raid_disk < 0 &&
                    !test_bit(Faulty, &rdev->flags))