linux-kernel - [PATCH 22/23] elevate mnt writers for vfs

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Message-Id: <20070712001740.DCBCA563@kernel>
Date:	Wed, 11 Jul 2007 17:17:40 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	hch@...radead.org, Dave Hansen <haveblue@...ibm.com>
Subject: [PATCH 22/23] elevate mnt writers for vfs_unlink() callers



Signed-off-by: Dave Hansen <haveblue@...ibm.com>
---

 lxc-dave/fs/namei.c   |    4 ++++
 lxc-dave/ipc/mqueue.c |    5 ++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff -puN fs/namei.c~elevate-mnt-writers-for-vfs-unlink-callers fs/namei.c
--- lxc/fs/namei.c~elevate-mnt-writers-for-vfs-unlink-callers	2007-07-10 12:46:16.000000000 -0700
+++ lxc-dave/fs/namei.c	2007-07-10 12:46:16.000000000 -0700
@@ -2195,7 +2195,11 @@ static long do_unlinkat(int dfd, const c
 		inode = dentry->d_inode;
 		if (inode)
 			atomic_inc(&inode->i_count);
+		error = mnt_want_write(nd.mnt);
+		if (error)
+			goto exit2;
 		error = vfs_unlink(nd.dentry->d_inode, dentry);
+		mnt_drop_write(nd.mnt);
 	exit2:
 		dput(dentry);
 	}
diff -puN ipc/mqueue.c~elevate-mnt-writers-for-vfs-unlink-callers ipc/mqueue.c
--- lxc/ipc/mqueue.c~elevate-mnt-writers-for-vfs-unlink-callers	2007-07-10 12:46:16.000000000 -0700
+++ lxc-dave/ipc/mqueue.c	2007-07-10 12:46:16.000000000 -0700
@@ -750,8 +750,11 @@ asmlinkage long sys_mq_unlink(const char
 	inode = dentry->d_inode;
 	if (inode)
 		atomic_inc(&inode->i_count);
-
+	err = mnt_want_write(mqueue_mnt);
+	if (err)
+		goto out_err;
 	err = vfs_unlink(dentry->d_parent->d_inode, dentry);
+	mnt_drop_write(mqueue_mnt);
 out_err:
 	dput(dentry);
 
_
-
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