md: split md_set_readonly out of do_md_stop

Using do_md_stop to set an array to read-only is a little confusing.
Now most of the common code has been factored out, split
md_set_readonly off in to a separate function.

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

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 86dfbc3..3a2710a 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3309,6 +3309,7 @@ array_state_show(mddev_t *mddev, char *page)
 }
 
 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
+static int md_set_readonly(mddev_t * mddev, int is_open);
 static int do_md_run(mddev_t * mddev);
 static int restart_array(mddev_t *mddev);
 
@@ -3339,7 +3340,7 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
                break; /* not supported yet */
        case readonly:
                if (mddev->pers)
-                       err = do_md_stop(mddev, 1, 0);
+                       err = md_set_readonly(mddev, 0);
                else {
                        mddev->ro = 1;
                        set_disk_ro(mddev->gendisk, 1);
@@ -3349,7 +3350,7 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
        case read_auto:
                if (mddev->pers) {
                        if (mddev->ro == 0)
-                               err = do_md_stop(mddev, 1, 0);
+                               err = md_set_readonly(mddev, 0);
                        else if (mddev->ro == 1)
                                err = restart_array(mddev);
                        if (err == 0) {
@@ -4641,9 +4642,34 @@ static void md_stop(mddev_t *mddev)
 
 }
 
+static int md_set_readonly(mddev_t *mddev, int is_open)
+{
+       int err = 0;
+       mutex_lock(&mddev->open_mutex);
+       if (atomic_read(&mddev->openers) > is_open) {
+               printk("md: %s still in use.\n",mdname(mddev));
+               err = -EBUSY;
+               goto out;
+       }
+       if (mddev->pers) {
+               md_stop_writes(mddev);
+
+               err  = -ENXIO;
+               if (mddev->ro==1)
+                       goto out;
+               mddev->ro = 1;
+               set_disk_ro(mddev->gendisk, 1);
+               clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
+               sysfs_notify_dirent(mddev->sysfs_state);
+               err = 0;        
+       }
+out:
+       mutex_unlock(&mddev->open_mutex);
+       return err;
+}
+
 /* mode:
  *   0 - completely stop and dis-assemble array
- *   1 - switch to readonly
  *   2 - stop but do not disassemble array
  */
 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
@@ -4660,45 +4686,33 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
 
                md_stop_writes(mddev);
 
-               switch(mode) {
-               case 1: /* readonly */
-                       err  = -ENXIO;
-                       if (mddev->ro==1)
-                               goto out;
-                       mddev->ro = 1;
-                       break;
-               case 0: /* disassemble */
-               case 2: /* stop */
-                       if (mddev->ro)
-                               set_disk_ro(disk, 0);
+               if (mddev->ro)
+                       set_disk_ro(disk, 0);
 
-                       md_stop(mddev);
-                       mddev->queue->merge_bvec_fn = NULL;
-                       mddev->queue->unplug_fn = NULL;
-                       mddev->queue->backing_dev_info.congested_fn = NULL;
+               md_stop(mddev);
+               mddev->queue->merge_bvec_fn = NULL;
+               mddev->queue->unplug_fn = NULL;
+               mddev->queue->backing_dev_info.congested_fn = NULL;
 
-                       /* tell userspace to handle 'inactive' */
-                       sysfs_notify_dirent(mddev->sysfs_state);
+               /* tell userspace to handle 'inactive' */
+               sysfs_notify_dirent(mddev->sysfs_state);
 
-                       list_for_each_entry(rdev, &mddev->disks, same_set)
-                               if (rdev->raid_disk >= 0) {
-                                       char nm[20];
-                                       sprintf(nm, "rd%d", rdev->raid_disk);
-                                       sysfs_remove_link(&mddev->kobj, nm);
-                               }
+               list_for_each_entry(rdev, &mddev->disks, same_set)
+                       if (rdev->raid_disk >= 0) {
+                               char nm[20];
+                               sprintf(nm, "rd%d", rdev->raid_disk);
+                               sysfs_remove_link(&mddev->kobj, nm);
+                       }
 
-                       set_capacity(disk, 0);
-                       revalidate_disk(disk);
+               set_capacity(disk, 0);
+               revalidate_disk(disk);
 
-                       if (mddev->ro)
-                               mddev->ro = 0;
-               }
-               if (mode == 1)
-                       set_disk_ro(disk, 1);
+               if (mddev->ro)
+                       mddev->ro = 0;
+               
                clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
                err = 0;
        }
-out:
        mutex_unlock(&mddev->open_mutex);
        if (err)
                return err;
@@ -4724,9 +4738,7 @@ out:
                if (mddev->hold_active == UNTIL_STOP)
                        mddev->hold_active = 0;
 
-       } else if (mddev->pers)
-               printk(KERN_INFO "md: %s switched to read-only mode.\n",
-                       mdname(mddev));
+       }
        err = 0;
        blk_integrity_unregister(disk);
        md_new_event(mddev);
@@ -5724,7 +5736,7 @@ static int md_ioctl(struct block_device *bdev, fmode_t mode,
                        goto done_unlock;
 
                case STOP_ARRAY_RO:
-                       err = do_md_stop(mddev, 1, 1);
+                       err = md_set_readonly(mddev, 1);
                        goto done_unlock;
 
                case BLKROSET:
@@ -7140,7 +7152,7 @@ static int md_notify_reboot(struct notifier_block *this,
                                 * appears to still be in use.  Hence
                                 * the '100'.
                                 */
-                               do_md_stop(mddev, 1, 100);
+                               md_set_readonly(mddev, 100);
                                mddev_unlock(mddev);
                        }
                /*