linux-kernel - [PATCH 5/5] NFS: Correct the NFS mount path when following a referral

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Message-ID: <20090622190914.27923.84173.stgit@heimdal.trondhjem.org>
Date:	Mon, 22 Jun 2009 15:09:14 -0400
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] NFS: Correct the NFS mount path when following a
 referral

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
---

 fs/nfs/super.c |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)


diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 8da7e59..daecbad 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2548,6 +2548,27 @@ static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
 	return root_mnt;
 }
 
+static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
+{
+	char *page = (char *) __get_free_page(GFP_KERNEL);
+	char *devname, *tmp;
+
+	if (page == NULL)
+		return;
+	devname = nfs_path(path->mnt->mnt_devname,
+			path->mnt->mnt_root, path->dentry,
+			page, PAGE_SIZE);
+	if (devname == NULL)
+		goto out_freepage;
+	tmp = kstrdup(devname, GFP_KERNEL);
+	if (tmp == NULL)
+		goto out_freepage;
+	kfree(mnt->mnt_devname);
+	mnt->mnt_devname = tmp;
+out_freepage:
+	free_page((unsigned long)page);
+}
+
 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
 		const char *export_path, struct vfsmount *mnt_target)
 {
@@ -2574,6 +2595,9 @@ static int nfs_follow_remote_path(struct vfsmount *root_mnt,
 	mnt_target->mnt_sb = s;
 	mnt_target->mnt_root = dget(nd.path.dentry);
 
+	/* Correct the device pathname */
+	nfs_fix_devname(&nd.path, mnt_target);
+
 	path_put(&nd.path);
 	down_write(&s->s_umount);
 	return 0;

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