bcache: configure the asynchronous registertion to be experimental

In order to avoid the experimental async registration interface to be treated as new kernel ABI for common users, this patch makes it as an experimental kernel configure BCACHE_ASYNC_REGISTRAION. This interface is for extreme large cached data situation, to make sure the bcache device can always created without the udev timeout issue. For normal users the async or sync registration does not make difference. In future when we decide to use the asynchronous registration as default behavior, this experimental interface may be removed.

Coly Li committed 6 years ago

Commit 0c8d3fc1 parent 9e23ccf2 files · +11 −0Browse files

Unified · Split

2 files

drivers/md/bcache/Kconfig +9 −0
drivers/md/bcache/super.c +2 −0

drivers/md/bcache/Kconfig+9−0

@@ -26,3 +26,12 @@ config BCACHE_CLOSURES_DEBUG · 25 unmodified lines
26	Keeps all active closures in a linked list and provides a debugfs	26	Keeps all active closures in a linked list and provides a debugfs
27	interface to list them, which makes it possible to see asynchronous	27	interface to list them, which makes it possible to see asynchronous
28	operations that get stuck.	28	operations that get stuck.
		29
		30	config BCACHE_ASYNC_REGISTRAION
		31	bool "Asynchronous device registration (EXPERIMENTAL)"
		32	depends on BCACHE
		33	help
		34	Add a sysfs file /sys/fs/bcache/register_async. Writing registering
		35	device path into this file will returns immediately and the real
		36	registration work is handled in kernel work queue in asynchronous
		37	way.

drivers/md/bcache/super.c+2−0

 	static const struct attribute *files[] = {
 		&ksysfs_register.attr,
 		&ksysfs_register_quiet.attr,
+#ifdef CONFIG_BCACHE_ASYNC_REGISTRAION
 		&ksysfs_register_async.attr,
+#endif
 		&ksysfs_pendings_cleanup.attr,
 		NULL
 	};