From: Jeff Layton <jlayton@redhat.com>
Date: Tue, 11 Dec 2012 17:10:06 +0000 (-0500)
Subject: vfs: fix readlinkat to retry on ESTALE
X-Git-Tag: v3.12-rc1~1680^2~25
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7955119e02d9fdf78a39fba8073f19ca6152613e;p=kernel%2Fkernel-generic.git

vfs: fix readlinkat to retry on ESTALE

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/stat.c b/fs/stat.c
index d221995..14f4545 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -300,11 +300,13 @@ SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
 	struct path path;
 	int error;
 	int empty = 0;
+	unsigned int lookup_flags = LOOKUP_EMPTY;
 
 	if (bufsiz <= 0)
 		return -EINVAL;
 
-	error = user_path_at_empty(dfd, pathname, LOOKUP_EMPTY, &path, &empty);
+retry:
+	error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
 	if (!error) {
 		struct inode *inode = path.dentry->d_inode;
 
@@ -318,6 +320,10 @@ SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
 			}
 		}
 		path_put(&path);
+		if (retry_estale(error, lookup_flags)) {
+			lookup_flags |= LOOKUP_REVAL;
+			goto retry;
+		}
 	}
 	return error;
 }