namei: unlazy_walk() doesn't need to mess with current->fs anymore

now that we have ->root_seq, legitimize_path(&nd->root, nd->root_seq)
will do just fine...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 4 insertions, 7 deletions

diff --git a/fs/namei.c b/fs/namei.c
index a5ed0d070a20..0cccb24ac0b7 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -651,7 +651,6 @@ static bool legitimize_links(struct nameidata *nd)
  */
 static int unlazy_walk(struct nameidata *nd, struct dentry *dentry, unsigned seq)
 {
-        struct fs_struct *fs = current->fs;
         struct dentry *parent = nd->path.dentry;
 
         BUG_ON(!(nd->flags & LOOKUP_RCU));
@@ -691,13 +690,11 @@ static int unlazy_walk(struct nameidata *nd, struct dentry *dentry, unsigned seq
          * still valid and get it if required.
          */
         if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) {
-                spin_lock(&fs->lock);
-                if (unlikely(!path_equal(&nd->root, &fs->root))) {
-                        spin_unlock(&fs->lock);
-                        goto drop_dentry;
+                if (unlikely(!legitimize_path(nd, &nd->root, nd->root_seq))) {
+                        rcu_read_unlock();
+                        dput(dentry);
+                        return -ECHILD;
                 }
-                path_get(&nd->root);
-                spin_unlock(&fs->lock);
         }
 
         rcu_read_unlock();