From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Mon, 22 Jun 2009 19:09:14 +0000 (-0400)
Subject: NFS: Correct the NFS mount path when following a referral
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b88f8a546f5dba213938fdfc11e66bc5c2421623;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

NFS: Correct the NFS mount path when following a referral

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 8e0673a0d6aa..0b4cbdc60abd 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2559,6 +2559,27 @@ 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)
 {
@@ -2585,6 +2606,9 @@ 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;