md: Ensure an md array never has too many devices.

Each different metadata format supported by md supports a
different maximum number of devices.
We really should be enforcing this maximum in the kernel, but
we aren't quite doing that properly.

We currently only enforce it at the 'hot_add' point, which is an
older interface which is not used by current userspace.

We need to also enforce it at 'add_new_disk' time for active arrays
and at 'do_md_run' time when starting a new array.

So move the test from 'hot_add' into 'bind_rdev_to_array' which is
called from both 'hot_add' and 'add_new_disk, and add a new
test in 'analyse_sbs' which is called from 'do_md_run'.

This bug (or missing feature) has been around "forever" and so
the patch is suitable for any -stable that is currently maintained.

Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 41e2509..4495104 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1481,6 +1481,11 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
                if (find_rdev_nr(mddev, rdev->desc_nr))
                        return -EBUSY;
        }
+       if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
+               printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
+                      mdname(mddev), mddev->max_disks);
+               return -EBUSY;
+       }
        bdevname(rdev->bdev,b);
        while ( (s=strchr(b, '/')) != NULL)
                *s = '!';
@@ -2441,6 +2446,15 @@ static void analyze_sbs(mddev_t * mddev)
 
        i = 0;
        rdev_for_each(rdev, tmp, mddev) {
+               if (rdev->desc_nr >= mddev->max_disks ||
+                   i > mddev->max_disks) {
+                       printk(KERN_WARNING
+                              "md: %s: %s: only %d devices permitted\n",
+                              mdname(mddev), bdevname(rdev->bdev, b),
+                              mddev->max_disks);
+                       kick_rdev_from_array(rdev);
+                       continue;
+               }
                if (rdev != freshest)
                        if (super_types[mddev->major_version].
                            validate_super(mddev, rdev)) {
@@ -4614,13 +4628,6 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev)
         * noticed in interrupt contexts ...
         */
 
-       if (rdev->desc_nr == mddev->max_disks) {
-               printk(KERN_WARNING "%s: can not hot-add to full array!\n",
-                       mdname(mddev));
-               err = -EBUSY;
-               goto abort_unbind_export;
-       }
-
        rdev->raid_disk = -1;
 
        md_update_sb(mddev, 1);
@@ -4634,9 +4641,6 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev)
        md_new_event(mddev);
        return 0;
 
-abort_unbind_export:
-       unbind_rdev_from_array(rdev);
-
 abort_export:
        export_rdev(rdev);
        return err;