From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 13 Nov 2013 12:45:40 +0000 (-0500)
Subject: prepend_path() needs to reinitialize dentry/vfsmount/mnt on restarts
X-Git-Tag: v4.14-rc1~8607^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ede4cebce16f5643c61aedd6d88d9070a1d23a68;p=platform%2Fkernel%2Flinux-rpi.git

prepend_path() needs to reinitialize dentry/vfsmount/mnt on restarts

... and equivalent is needed in 3.12; it's broken there as well

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/dcache.c b/fs/dcache.c
index eacc853..a9dd384 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2912,9 +2912,9 @@ static int prepend_path(const struct path *path,
 			const struct path *root,
 			char **buffer, int *buflen)
 {
-	struct dentry *dentry = path->dentry;
-	struct vfsmount *vfsmnt = path->mnt;
-	struct mount *mnt = real_mount(vfsmnt);
+	struct dentry *dentry;
+	struct vfsmount *vfsmnt;
+	struct mount *mnt;
 	int error = 0;
 	unsigned seq, m_seq = 0;
 	char *bptr;
@@ -2929,6 +2929,9 @@ restart:
 	bptr = *buffer;
 	blen = *buflen;
 	error = 0;
+	dentry = path->dentry;
+	vfsmnt = path->mnt;
+	mnt = real_mount(vfsmnt);
 	read_seqbegin_or_lock(&rename_lock, &seq);
 	while (dentry != root->dentry || vfsmnt != root->mnt) {
 		struct dentry * parent;