vfs: fix symlinkat to retry on ESTALE errors

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

1 files changed, 7 insertions, 2 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 1beebc1a38c9..b06a111591a8 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3521,12 +3521,13 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
         struct filename *from;
         struct dentry *dentry;
         struct path path;
+        unsigned int lookup_flags = 0;
 
         from = getname(oldname);
         if (IS_ERR(from))
                 return PTR_ERR(from);
-
-        dentry = user_path_create(newdfd, newname, &path, 0);
+retry:
+        dentry = user_path_create(newdfd, newname, &path, lookup_flags);
         error = PTR_ERR(dentry);
         if (IS_ERR(dentry))
                 goto out_putname;
@@ -3535,6 +3536,10 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
         if (!error)
                 error = vfs_symlink(path.dentry->d_inode, dentry, from->name);
         done_path_create(&path, dentry);
+        if (retry_estale(error, lookup_flags)) {
+                lookup_flags |= LOOKUP_REVAL;
+                goto retry;
+        }
 out_putname:
         putname(from);
         return error;