From: Jeff Layton <jlayton@redhat.com>
Date: Tue, 11 Dec 2012 17:10:13 +0000 (-0500)
Subject: vfs: make fchmodat retry once on ESTALE errors
X-Git-Tag: upstream/snapshot3+hdmi~5970^2~11
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=14ff690c0f94cf2e37f7c448f4f09bf0b4006d62;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

vfs: make fchmodat 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/open.c b/fs/open.c
index a13a54d..99c3ce5 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -514,11 +514,16 @@ SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, umode_t, mode
 {
 	struct path path;
 	int error;
-
-	error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
+	unsigned int lookup_flags = LOOKUP_FOLLOW;
+retry:
+	error = user_path_at(dfd, filename, lookup_flags, &path);
 	if (!error) {
 		error = chmod_common(&path, mode);
 		path_put(&path);
+		if (retry_estale(error, lookup_flags)) {
+			lookup_flags |= LOOKUP_REVAL;
+			goto retry;
+		}
 	}
 	return error;
 }