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Btrfs: fix lockdep warning on clone ioctl

Message ID 1270666412-17012-1-git-send-email-sage@newdream.net (mailing list archive)
State New, archived
Headers show

Commit Message

Sage Weil April 7, 2010, 6:53 p.m. UTC 
None
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Patch

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index c8e6470..ae2b9a0 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1530,11 +1530,11 @@  static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
 	path->reada = 2;
 
 	if (inode < src) {
-		mutex_lock(&inode->i_mutex);
-		mutex_lock(&src->i_mutex);
+		mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
+		mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
 	} else {
-		mutex_lock(&src->i_mutex);
-		mutex_lock(&inode->i_mutex);
+		mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
+		mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
 	}
 
 	/* determine range to clone */