From: Jeff Layton <jlayton@redhat.com>
Date: Tue, 11 Dec 2012 17:10:15 +0000 (-0500)
Subject: vfs: allow setxattr to retry once on ESTALE errors
X-Git-Tag: v3.8-rc1~13^2~7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=68f1bb8bb89e0bb813c893a42373a26ebdab7f9c;p=profile%2Fcommon%2Fkernel-common.git

vfs: allow setxattr to retry once on ESTALE errors

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

diff --git a/fs/xattr.c b/fs/xattr.c
index e21c119..c5e90d2 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -370,8 +370,9 @@ SYSCALL_DEFINE5(setxattr, const char __user *, pathname,
 {
 	struct path path;
 	int error;
-
-	error = user_path(pathname, &path);
+	unsigned int lookup_flags = LOOKUP_FOLLOW;
+retry:
+	error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
 	if (error)
 		return error;
 	error = mnt_want_write(path.mnt);
@@ -380,6 +381,10 @@ SYSCALL_DEFINE5(setxattr, const char __user *, pathname,
 		mnt_drop_write(path.mnt);
 	}
 	path_put(&path);
+	if (retry_estale(error, lookup_flags)) {
+		lookup_flags |= LOOKUP_REVAL;
+		goto retry;
+	}
 	return error;
 }