}
/**
- * unlazy_child - try to switch to ref-walk mode.
+ * try_to_unlazy_next - try to switch to ref-walk mode.
* @nd: nameidata pathwalk data
- * @dentry: child of nd->path.dentry
- * @seq: seq number to check dentry against
- * Returns: 0 on success, -ECHILD on failure
+ * @dentry: next dentry to step into
+ * @seq: seq number to check @dentry against
+ * Returns: true on success, false on failure
*
- * unlazy_child attempts to legitimize the current nd->path, nd->root and dentry
- * for ref-walk mode. @dentry must be a path found by a do_lookup call on
- * @nd. Must be called from rcu-walk context.
- * Nothing should touch nameidata between unlazy_child() failure and
+ * Similar to to try_to_unlazy(), but here we have the next dentry already
+ * picked by rcu-walk and want to legitimize that in addition to the current
+ * nd->path and nd->root for ref-walk mode. Must be called from rcu-walk context.
+ * Nothing should touch nameidata between try_to_unlazy_next() failure and
* terminate_walk().
*/
-static int unlazy_child(struct nameidata *nd, struct dentry *dentry, unsigned seq)
+static bool try_to_unlazy_next(struct nameidata *nd, struct dentry *dentry, unsigned seq)
{
BUG_ON(!(nd->flags & LOOKUP_RCU));
if (unlikely(!legitimize_root(nd)))
goto out_dput;
rcu_read_unlock();
- return 0;
+ return true;
out2:
nd->path.mnt = NULL;
nd->path.dentry = NULL;
out:
rcu_read_unlock();
- return -ECHILD;
+ return false;
out_dput:
rcu_read_unlock();
dput(dentry);
- return -ECHILD;
+ return false;
}
static inline int d_revalidate(struct dentry *dentry, unsigned int flags)
return -ENOENT;
if (likely(__follow_mount_rcu(nd, path, inode, seqp)))
return 0;
- if (unlazy_child(nd, dentry, seq))
+ if (!try_to_unlazy_next(nd, dentry, seq))
return -ECHILD;
// *path might've been clobbered by __follow_mount_rcu()
path->mnt = nd->path.mnt;
status = d_revalidate(dentry, nd->flags);
if (likely(status > 0))
return dentry;
- if (unlazy_child(nd, dentry, seq))
+ if (!try_to_unlazy_next(nd, dentry, seq))
return ERR_PTR(-ECHILD);
if (status == -ECHILD)
/* we'd been told to redo it in non-rcu mode */