md: resolve external metadata handling deadlock in md_allow_write

[linux-2.6-omap-h63xx.git] / drivers / md / md.c

diff --git a/drivers/md/md.c b/drivers/md/md.c
index df1230af02cd5cb3db9f8bdc1771841d707b4011..43d033d9a05a7e8a1d0bd4bc8d6b79fc9760be02 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4172,9 +4172,11 @@ static int get_bitmap_file(mddev_t * mddev, void __user * arg)
        char *ptr, *buf = NULL;
        int err = -ENOMEM;
 
-       md_allow_write(mddev);
+       if (md_allow_write(mddev))
+               file = kmalloc(sizeof(*file), GFP_NOIO);
+       else
+               file = kmalloc(sizeof(*file), GFP_KERNEL);
 
-       file = kmalloc(sizeof(*file), GFP_KERNEL);
        if (!file)
                goto out;
 
@@ -5667,15 +5669,18 @@ void md_write_end(mddev_t *mddev)
  * may proceed without blocking.  It is important to call this before
  * attempting a GFP_KERNEL allocation while holding the mddev lock.
  * Must be called with mddev_lock held.
+ *
+ * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
+ * is dropped, so return -EAGAIN after notifying userspace.
  */
-void md_allow_write(mddev_t *mddev)
+int md_allow_write(mddev_t *mddev)
 {
        if (!mddev->pers)
-               return;
+               return 0;
        if (mddev->ro)
-               return;
+               return 0;
        if (!mddev->pers->sync_request)
-               return;
+               return 0;
 
        spin_lock_irq(&mddev->write_lock);
        if (mddev->in_sync) {
@@ -5686,14 +5691,14 @@ void md_allow_write(mddev_t *mddev)
                        mddev->safemode = 1;
                spin_unlock_irq(&mddev->write_lock);
                md_update_sb(mddev, 0);
-
                sysfs_notify(&mddev->kobj, NULL, "array_state");
-               /* wait for the dirty state to be recorded in the metadata */
-               wait_event(mddev->sb_wait,
-                          !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
-                          !test_bit(MD_CHANGE_PENDING, &mddev->flags));
        } else
                spin_unlock_irq(&mddev->write_lock);
+
+       if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
+               return -EAGAIN;
+       else
+               return 0;
 }
 EXPORT_SYMBOL_GPL(md_allow_write);