linux-kernel - [PATCH v8 19/32] vfs: fix user_statfs to retry once on ESTALE errors

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Message-Id: <1351341219-17837-20-git-send-email-jlayton@redhat.com>
Date:	Sat, 27 Oct 2012 08:33:26 -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 v8 19/32] vfs: fix user_statfs to retry once on ESTALE errors

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/statfs.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/fs/statfs.c b/fs/statfs.c
index f8e832e..7b42ca3 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -77,11 +77,19 @@ EXPORT_SYMBOL(vfs_statfs);
 int user_statfs(const char __user *pathname, struct kstatfs *st)
 {
 	struct path path;
-	int error = user_path_at(AT_FDCWD, pathname, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
-	if (!error) {
+	int error;
+	unsigned int try = 0;
+	unsigned int lookup_flags = LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT;
+
+	do {
+		error  = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+		if (error)
+			break;
+
 		error = vfs_statfs(&path, st);
 		path_put(&path);
-	}
+		lookup_flags |= LOOKUP_REVAL;
+	} while (retry_estale(error, try++));
 	return error;
 }
 
-- 
1.7.11.7

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