vfs: fix mkdirat to retry once on an ESTALE error

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

1 files changed, 7 insertions, 1 deletions

diff --git a/fs/namei.c b/fs/namei.c
index b70c191b7e2b..1beebc1a38c9 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3243,8 +3243,10 @@ SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
         struct dentry *dentry;
         struct path path;
         int error;
+        unsigned int lookup_flags = LOOKUP_DIRECTORY;
 
-        dentry = user_path_create(dfd, pathname, &path, LOOKUP_DIRECTORY);
+retry:
+        dentry = user_path_create(dfd, pathname, &path, lookup_flags);
         if (IS_ERR(dentry))
                 return PTR_ERR(dentry);
 
@@ -3254,6 +3256,10 @@ SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
         if (!error)
                 error = vfs_mkdir(path.dentry->d_inode, dentry, mode);
         done_path_create(&path, dentry);
+        if (retry_estale(error, lookup_flags)) {
+                lookup_flags |= LOOKUP_REVAL;
+                goto retry;
+        }
         return error;
 }