linux-kernel - [PATCH v6 17/20] vfs: make fchmodat retry once on ESTALE errors

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Message-Id: <1347027507-20956-18-git-send-email-jlayton@redhat.com>
Date:	Fri,  7 Sep 2012 10:18:24 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	viro@...IV.linux.org.uk
Cc:	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, michael.brantley@...haw.com,
	hch@...radead.org, miklos@...redi.hu, pstaubach@...grid.com
Subject: [PATCH v6 17/20] vfs: make fchmodat retry once on ESTALE errors

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/open.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/fs/open.c b/fs/open.c
index a015cb8..232cbfb 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -506,12 +506,17 @@ SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, umode_t, mode
 {
 	struct path path;
 	int error;
+	unsigned int try = 0;
+	int lookup_flags = LOOKUP_FOLLOW;
 
-	error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
-	if (!error) {
+	do {
+		error = user_path_at(dfd, filename, lookup_flags, &path);
+		if (error)
+			break;
 		error = chmod_common(&path, mode);
 		path_put(&path);
-	}
+		lookup_flags |= LOOKUP_REVAL;
+	} while (retry_estale(error, try++));
 	return error;
 }
 
-- 
1.7.11.4

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