vfs: make fstatat retry on ESTALE errors from getattr call

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/stat.c b/fs/stat.c
index eae494630a36..d22199527880 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -74,7 +74,7 @@ int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
 {
         struct path path;
         int error = -EINVAL;
-        int lookup_flags = 0;
+        unsigned int lookup_flags = 0;
 
         if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
                       AT_EMPTY_PATH)) != 0)
@@ -84,13 +84,17 @@ int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
                 lookup_flags |= LOOKUP_FOLLOW;
         if (flag & AT_EMPTY_PATH)
                 lookup_flags |= LOOKUP_EMPTY;
-
+retry:
         error = user_path_at(dfd, filename, lookup_flags, &path);
         if (error)
                 goto out;
 
         error = vfs_getattr(path.mnt, path.dentry, stat);
         path_put(&path);
+        if (retry_estale(error, lookup_flags)) {
+                lookup_flags |= LOOKUP_REVAL;
+                goto retry;
+        }
 out:
         return error;
 }