Re: [PATCH RESEND v6 2/9] dax: Introduce holder for dax_device

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On 7/30/2021 3:01 AM, Shiyang Ruan wrote:
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -214,6 +214,8 @@ enum dax_device_flags {
   * @cdev: optional character interface for "device dax"
   * @host: optional name for lookups where the device path is not available
   * @private: dax driver private data
+ * @holder_rwsem: prevent unregistration while holder_ops is in progress
+ * @holder_data: holder of a dax_device: could be filesystem or mapped device
   * @flags: state and boolean properties

Perhaps add two documentary lines for @ops and @holder_ops?
   */
  struct dax_device {
@@ -222,8 +224,11 @@ struct dax_device {
  	struct cdev cdev;
  	const char *host;
  	void *private;
+	struct rw_semaphore holder_rwsem;
+	void *holder_data;
  	unsigned long flags;
  	const struct dax_operations *ops;
+	const struct dax_holder_operations *holder_ops;
  };

thanks,
-jane



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