linux-kernel - [PATCH 12/28] elevate mnt writers for callers of vfs

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Message-Id: <20060801235249.D32CA134@localhost.localdomain>
Date:	Tue, 01 Aug 2006 16:52:49 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	viro@....linux.org.uk, herbert@...hfloor.at, hch@...radead.org,
	Dave Hansen <haveblue@...ibm.com>
Subject: [PATCH 12/28] elevate mnt writers for callers of vfs_mkdir()



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

 lxc-dave/fs/namei.c            |    5 +++++
 lxc-dave/fs/nfsd/nfs4recover.c |    4 ++++
 2 files changed, 9 insertions(+)

diff -puN fs/namei.c~C-elevate-writers-vfs_mkdir fs/namei.c
--- lxc/fs/namei.c~C-elevate-writers-vfs_mkdir	2006-08-01 16:35:14.000000000 -0700
+++ lxc-dave/fs/namei.c	2006-08-01 16:35:23.000000000 -0700
@@ -1952,7 +1952,12 @@ asmlinkage long sys_mkdirat(int dfd, con
 
 	if (!IS_POSIXACL(nd.dentry->d_inode))
 		mode &= ~current->fs->umask;
+	error = mnt_want_write(nd.mnt);
+	if (error)
+		goto out_dput;
 	error = vfs_mkdir(nd.dentry->d_inode, dentry, mode);
+	mnt_drop_write(nd.mnt);
+out_dput:
 	dput(dentry);
 out_unlock:
 	mutex_unlock(&nd.dentry->d_inode->i_mutex);
diff -puN fs/nfsd/nfs4recover.c~C-elevate-writers-vfs_mkdir fs/nfsd/nfs4recover.c
--- lxc/fs/nfsd/nfs4recover.c~C-elevate-writers-vfs_mkdir	2006-08-01 16:35:10.000000000 -0700
+++ lxc-dave/fs/nfsd/nfs4recover.c	2006-08-01 16:35:23.000000000 -0700
@@ -155,7 +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.dentry->d_inode, dentry, S_IRWXU);
+	mnt_drop_write(rec_dir.mnt);
 out_put:
 	dput(dentry);
 out_unlock:
_
-
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