linux-kernel - [PATCH 12/25] elevate write count for link and symlink calls

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Message-Id: <20070920195304.182F501B@kernel>
Date:	Thu, 20 Sep 2007 12:53:04 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	akpm@...l.org
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org,
	Dave Hansen <haveblue@...ibm.com>
Subject: [PATCH 12/25] elevate write count for link and symlink calls



Acked-by: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Dave Hansen <haveblue@...ibm.com>
---

 lxc-dave/fs/namei.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff -puN fs/namei.c~elevate-write-count-for-link-and-symlink-calls fs/namei.c
--- lxc/fs/namei.c~elevate-write-count-for-link-and-symlink-calls	2007-09-20 12:16:15.000000000 -0700
+++ lxc-dave/fs/namei.c	2007-09-20 12:16:15.000000000 -0700
@@ -2299,7 +2299,12 @@ asmlinkage long sys_symlinkat(const char
 	if (IS_ERR(dentry))
 		goto out_unlock;
 
+	error = mnt_want_write(nd.mnt);
+	if (error)
+		goto out_dput;
 	error = vfs_symlink(nd.dentry->d_inode, dentry, from, S_IALLUGO);
+	mnt_drop_write(nd.mnt);
+out_dput:
 	dput(dentry);
 out_unlock:
 	mutex_unlock(&nd.dentry->d_inode->i_mutex);
@@ -2394,7 +2399,12 @@ asmlinkage long sys_linkat(int olddfd, c
 	error = PTR_ERR(new_dentry);
 	if (IS_ERR(new_dentry))
 		goto out_unlock;
+	error = mnt_want_write(nd.mnt);
+	if (error)
+		goto out_dput;
 	error = vfs_link(old_nd.dentry, nd.dentry->d_inode, new_dentry);
+	mnt_drop_write(nd.mnt);
+out_dput:
 	dput(new_dentry);
 out_unlock:
 	mutex_unlock(&nd.dentry->d_inode->i_mutex);
_
-
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