[PATCH] md: avoid a deadlock when removing a device from an md array …

…via sysfs A device can be removed from an md array via e.g. echo remove > /sys/block/md3/md/dev-sde/state This will try to remove the 'dev-sde' subtree which will deadlock since commit e7b0d26 With this patch we run the kobject_del via schedule_work so as to avoid the deadlock. Cc: Alan Stern <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kyagi · Apr 5, 2007 · 5792a28 · 5792a28
1 parent 456a09d
commit 5792a28
Show file tree

Hide file tree

Showing 2 changed files with 16 additions and 1 deletion.
diff --git a/drivers/md/md.c b/drivers/md/md.c
@@ -1378,6 +1378,12 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
 	return err;
 }
 
+static void delayed_delete(struct work_struct *ws)
+{
+	mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
+	kobject_del(&rdev->kobj);
+}
+
 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
 {
 	char b[BDEVNAME_SIZE];
@@ -1390,7 +1396,12 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev)
 	printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
 	rdev->mddev = NULL;
 	sysfs_remove_link(&rdev->kobj, "block");
-	kobject_del(&rdev->kobj);
+
+	/* We need to delay this, otherwise we can deadlock when
+	 * writing to 'remove' to "dev/state"
+	 */
+	INIT_WORK(&rdev->del_work, delayed_delete);
+	schedule_work(&rdev->del_work);
 }
 
 /*
@@ -3389,6 +3400,9 @@ static int do_md_stop(mddev_t * mddev, int mode)
 				sysfs_remove_link(&mddev->kobj, nm);
 			}
 
+		/* make sure all delayed_delete calls have finished */
+		flush_scheduled_work();
+
 		export_array(mddev);
 
 		mddev->array_size = 0;

diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
@@ -104,6 +104,7 @@ struct mdk_rdev_s
 					   * for reporting to userspace and storing
 					   * in superblock.
 					   */
+	struct work_struct del_work;	/* used for delayed sysfs removal */
 };
 
 struct mddev_s