[PATCH 10/30] r/o bind mounts: elevate write count for vfs_rmdir()

[Dave Hansen]

Elevate the write count during the vfs_rmdir() call.

Acked-by: Serge Hallyn <serue@xxxxxxxxxx>
Acked-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Dave Hansen <haveblue@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 linux-2.6.git-dave/fs/namei.c |    5 +++++
 1 file changed, 5 insertions(+)

diff -puN fs/namei.c~r-o-bind-mounts-do_rmdir-elevate-write-count fs/namei.c
--- linux-2.6.git/fs/namei.c~r-o-bind-mounts-do_rmdir-elevate-write-count	2008-02-15 13:25:47.000000000 -0800
+++ linux-2.6.git-dave/fs/namei.c	2008-02-15 13:25:47.000000000 -0800
@@ -2189,7 +2189,12 @@ static long do_rmdir(int dfd, const char
 	error = PTR_ERR(dentry);
 	if (IS_ERR(dentry))
 		goto exit2;
+	error = mnt_want_write(nd.path.mnt);
+	if (error)
+		goto exit3;
 	error = vfs_rmdir(nd.path.dentry->d_inode, dentry);
+	mnt_drop_write(nd.path.mnt);
+exit3:
 	dput(dentry);
 exit2:
 	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
_
--
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