vfs: make do_unlinkat retry once on ESTALE errors

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

1 files changed, 8 insertions, 2 deletions

diff --git a/fs/namei.c b/fs/namei.c
index fe06a2fd1925..8a262c2efff8 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3440,8 +3440,9 @@ static long do_unlinkat(int dfd, const char __user *pathname)
         struct dentry *dentry;
         struct nameidata nd;
         struct inode *inode = NULL;
-
-        name = user_path_parent(dfd, pathname, &nd, 0);
+        unsigned int lookup_flags = 0;
+retry:
+        name = user_path_parent(dfd, pathname, &nd, lookup_flags);
         if (IS_ERR(name))
                 return PTR_ERR(name);
 
@@ -3479,6 +3480,11 @@ exit2:
 exit1:
         path_put(&nd.path);
         putname(name);
+        if (retry_estale(error, lookup_flags)) {
+                lookup_flags |= LOOKUP_REVAL;
+                inode = NULL;
+                goto retry;
+        }
         return error;
 
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