vfs: have faccessat retry once on an ESTALE error
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 07449b91..a994ccf 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -316,6 +316,7 @@
struct path path;
struct inode *inode;
int res;
+ unsigned int lookup_flags = LOOKUP_FOLLOW;
if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */
return -EINVAL;
@@ -338,8 +339,8 @@
}
old_cred = override_creds(override_cred);
-
- res = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
+retry:
+ res = user_path_at(dfd, filename, lookup_flags, &path);
if (res)
goto out;
@@ -374,6 +375,10 @@
out_path_release:
path_put(&path);
+ if (retry_estale(res, lookup_flags)) {
+ lookup_flags |= LOOKUP_REVAL;
+ goto retry;
+ }
out:
revert_creds(old_cred);
put_cred(override_cred);
