linux-kernel - [PATCH 3/5] vfs: don't use PARENT/CHILD lock classes for non-directories

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Message-Id: <1335367329-929-3-git-send-email-bfields@fieldses.org>
Date:	Wed, 25 Apr 2012 11:22:07 -0400
From:	bfields@...ldses.org
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	"J. Bruce Fields" <bfields@...hat.com>
Subject: [PATCH 3/5] vfs: don't use PARENT/CHILD lock classes for non-directories

From: "J. Bruce Fields" <bfields@...hat.com>

Reserve I_MUTEX_PARENT and I_MUTEX_CHILD for locking of actual
directories.

(Since I_MUTEX_QUOTA is now used just any time we need to lock a second
non-directory object, not necessarily a quota file, perhaps it should
get some more generic name, like I_MUTEX_NONDIR2.)

Signed-off-by: J. Bruce Fields <bfields@...hat.com>
---
 fs/inode.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/inode.c b/fs/inode.c
index 9718f1c..487c924 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -971,12 +971,12 @@ void lock_two_nondirectories(struct inode *inode1, struct inode *inode2)
 	if (inode1 == inode2 || inode2 == NULL)
 		mutex_lock(&inode1->i_mutex);
 	else if (inode1 < inode2) {
-		mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
-		mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
+		mutex_lock(&inode1->i_mutex);
+		mutex_lock_nested(&inode2->i_mutex, I_MUTEX_QUOTA);
 
 	} else {
-		mutex_lock_nested(&inode2->i_mutex, I_MUTEX_PARENT);
-		mutex_lock_nested(&inode1->i_mutex, I_MUTEX_CHILD);
+		mutex_lock(&inode2->i_mutex);
+		mutex_lock_nested(&inode1->i_mutex, I_MUTEX_QUOTA);
 	}
 }
 EXPORT_SYMBOL(lock_two_nondirectories);
-- 
1.7.5.4

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