linux-kernel - [PATCH 08/23] vfs: Teach readdir to use file_hotplug

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Date:	Mon,  1 Jun 2009 14:50:33 -0700
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	<linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-mm@...ck.org>, <linux-fsdevel@...r.kernel.org>,
	Hugh Dickins <hugh@...itas.com>, Tejun Heo <tj@...nel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	"Eric W. Biederman" <ebiederm@...well.arastra.com>,
	"Eric W. Biederman" <ebiederm@...stanetworks.com>
Subject: [PATCH 08/23] vfs: Teach readdir to use file_hotplug_lock

From: Eric W. Biederman <ebiederm@...well.arastra.com>

Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
---
 fs/readdir.c |   20 +++++++++++++++-----
 1 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/fs/readdir.c b/fs/readdir.c
index 7723401..2e147cf 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -21,18 +21,26 @@
 
 int vfs_readdir(struct file *file, filldir_t filler, void *buf)
 {
-	struct inode *inode = file->f_path.dentry->d_inode;
-	int res = -ENOTDIR;
-	if (!file->f_op || !file->f_op->readdir)
+	struct inode *inode;
+	int res;
+
+	res = -EIO;
+	if (!file_hotplug_read_trylock(file))
 		goto out;
 
+	inode = file->f_path.dentry->d_inode;
+
+	res = -ENOTDIR;
+	if (!file->f_op || !file->f_op->readdir)
+		goto out_unlock;
+
 	res = security_file_permission(file, MAY_READ);
 	if (res)
-		goto out;
+		goto out_unlock;
 
 	res = mutex_lock_killable(&inode->i_mutex);
 	if (res)
-		goto out;
+		goto out_unlock;
 
 	res = -ENOENT;
 	if (!IS_DEADDIR(inode)) {
@@ -40,6 +48,8 @@ int vfs_readdir(struct file *file, filldir_t filler, void *buf)
 		file_accessed(file);
 	}
 	mutex_unlock(&inode->i_mutex);
+out_unlock:
+	file_hotplug_read_unlock(file);
 out:
 	return res;
 }
-- 
1.6.3.1.54.g99dd.dirty

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