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Message-Id: <20080215223735.CBBD2484@kernel>
Date: Fri, 15 Feb 2008 14:37:35 -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 11/30] r/o bind mounts: elevate write count for callers of vfs_mkdir()
Pretty self-explanatory. Fits in with the rest of the series.
Acked-by: Al Viro <viro@...IV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Dave Hansen <haveblue@...ibm.com>
---
linux-2.6.git-dave/fs/namei.c | 5 +++++
linux-2.6.git-dave/fs/nfsd/nfs4recover.c | 5 +++++
2 files changed, 10 insertions(+)
diff -puN fs/namei.c~r-o-bind-mounts-elevate-mnt-writers-for-callers-of-vfs_mkdir fs/namei.c
--- linux-2.6.git/fs/namei.c~r-o-bind-mounts-elevate-mnt-writers-for-callers-of-vfs_mkdir 2008-02-15 13:25:47.000000000 -0800
+++ linux-2.6.git-dave/fs/namei.c 2008-02-15 13:25:47.000000000 -0800
@@ -2082,7 +2082,12 @@ asmlinkage long sys_mkdirat(int dfd, con
if (!IS_POSIXACL(nd.path.dentry->d_inode))
mode &= ~current->fs->umask;
+ error = mnt_want_write(nd.path.mnt);
+ if (error)
+ goto out_dput;
error = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode);
+ mnt_drop_write(nd.path.mnt);
+out_dput:
dput(dentry);
out_unlock:
mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
diff -puN fs/nfsd/nfs4recover.c~r-o-bind-mounts-elevate-mnt-writers-for-callers-of-vfs_mkdir fs/nfsd/nfs4recover.c
--- linux-2.6.git/fs/nfsd/nfs4recover.c~r-o-bind-mounts-elevate-mnt-writers-for-callers-of-vfs_mkdir 2008-02-15 13:25:47.000000000 -0800
+++ linux-2.6.git-dave/fs/nfsd/nfs4recover.c 2008-02-15 13:25:47.000000000 -0800
@@ -41,6 +41,7 @@
#include <linux/nfsd/xdr4.h>
#include <linux/param.h>
#include <linux/file.h>
+#include <linux/mount.h>
#include <linux/namei.h>
#include <asm/uaccess.h>
#include <linux/scatterlist.h>
@@ -154,7 +155,11 @@ nfsd4_create_clid_dir(struct nfs4_client
dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
goto out_put;
}
+ status = mnt_want_write(rec_dir.mnt);
+ if (status)
+ goto out_put;
status = vfs_mkdir(rec_dir.path.dentry->d_inode, dentry, S_IRWXU);
+ mnt_drop_write(rec_dir.mnt);
out_put:
dput(dentry);
out_unlock:
_
--
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