linux-kernel - [PATCH v3 23/25] cgroup: Change how dentry's d

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Date:	Wed,  3 Jul 2013 16:22:06 -0400
From:	Waiman Long <Waiman.Long@...com>
To:	Alexander Viro <viro@...iv.linux.org.uk>,
	Jeff Layton <jlayton@...hat.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	Waiman Long <Waiman.Long@...com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>
Subject: [PATCH v3 23/25] cgroup: Change how dentry's d_lock field is accessed

Because of the changes made in dcache.h header file, files that
use the d_lock field of the dentry structure need to be changed
accordingly. All the d_lock's spin_lock() and spin_unlock() calls
are replaced by the corresponding d_lock() and d_unlock() calls.
There is no change in logic and everything should just work.

Signed-off-by: Waiman Long <Waiman.Long@...com>
---
 kernel/cgroup.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a7c9e6d..8935c05 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -974,11 +974,11 @@ static void cgroup_d_remove_dir(struct dentry *dentry)
 	cgroup_clear_directory(dentry, true, root->subsys_mask);
 
 	parent = dentry->d_parent;
-	spin_lock(&parent->d_lock);
-	spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
+	d_lock(parent);
+	d_lock_nested(dentry, DENTRY_D_LOCK_NESTED);
 	list_del_init(&dentry->d_u.d_child);
-	spin_unlock(&dentry->d_lock);
-	spin_unlock(&parent->d_lock);
+	d_unlock(dentry);
+	d_unlock(parent);
 	remove_dir(dentry);
 }
 
@@ -1783,7 +1783,7 @@ static struct kobject *cgroup_kobj;
  * Writes path of cgroup into buf.  Returns 0 on success, -errno on error.
  *
  * We can't generate cgroup path using dentry->d_name, as accessing
- * dentry->name must be protected by irq-unsafe dentry->d_lock or parent
+ * dentry->name must be protected by irq-unsafe d_ret_lock(dentry) or parent
  * inode's i_mutex, while on the other hand cgroup_path() can be called
  * with some irq-safe spinlocks held.
  */
-- 
1.7.1

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