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

[Jeff Layton]

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
 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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