vfs: make listxattr retry once on ESTALE error

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 c127d57bf655e1de05d39ede2739dba47f2338c3..1dc1eac173197df9a8fa4dba34c8d7496964788b 100644 (file)
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -576,12 +576,17 @@ SYSCALL_DEFINE3(listxattr, const char __user *, pathname, char __user *, list,
 {
        struct path path;
        ssize_t 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 = listxattr(path.dentry, list, size);
        path_put(&path);
+       if (retry_estale(error, lookup_flags)) {
+               lookup_flags |= LOOKUP_REVAL;
+               goto retry;
+       }
        return error;
 }