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>

diff --git a/fs/namei.c b/fs/namei.c
index fe06a2f..8a262c2 100644 (file)
--- 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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