linux-kernel - [PATCH 23/30] r/o bind mounts: write counts for truncate()

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Message-Id: <20080215223752.56645DCB@kernel>
Date:	Fri, 15 Feb 2008 14:37:52 -0800
From:	Dave Hansen <haveblue@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	hch@....de, miklos@...redi.hu, akpm@...l.org,
	Dave Hansen <haveblue@...ibm.com>
Subject: [PATCH 23/30] r/o bind mounts: write counts for truncate()



Acked-by: Al Viro <viro@...IV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Dave Hansen <haveblue@...ibm.com>
---

 linux-2.6.git-dave/fs/open.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff -puN fs/open.c~r-o-bind-mounts-elevate-writer-count-for-do_sys_truncate fs/open.c
--- linux-2.6.git/fs/open.c~r-o-bind-mounts-elevate-writer-count-for-do_sys_truncate	2008-02-15 13:25:55.000000000 -0800
+++ linux-2.6.git-dave/fs/open.c	2008-02-15 13:25:55.000000000 -0800
@@ -244,21 +244,21 @@ static long do_sys_truncate(const char _
 	if (!S_ISREG(inode->i_mode))
 		goto dput_and_out;
 
-	error = vfs_permission(&nd, MAY_WRITE);
+	error = mnt_want_write(nd.path.mnt);
 	if (error)
 		goto dput_and_out;
 
-	error = -EROFS;
-	if (IS_RDONLY(inode))
-		goto dput_and_out;
+	error = vfs_permission(&nd, MAY_WRITE);
+	if (error)
+		goto mnt_drop_write_and_out;
 
 	error = -EPERM;
 	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
-		goto dput_and_out;
+		goto mnt_drop_write_and_out;
 
 	error = get_write_access(inode);
 	if (error)
-		goto dput_and_out;
+		goto mnt_drop_write_and_out;
 
 	/*
 	 * Make sure that there are no leases.  get_write_access() protects
@@ -276,6 +276,8 @@ static long do_sys_truncate(const char _
 
 put_write_and_out:
 	put_write_access(inode);
+mnt_drop_write_and_out:
+	mnt_drop_write(nd.path.mnt);
 dput_and_out:
 	path_put(&nd.path);
 out:
_
--
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