bcache: configure the asynchronous registertion to be experimental (0c8d3fce) · Commits · 戴 / test

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. Signed-off-by:

Coly Li <colyli@suse.de> Signed-off-by:

Jens Axboe <axboe@kernel.dk>

drivers/md/bcache/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -26,3 +26,12 @@ config BCACHE_CLOSURES_DEBUG
		Keeps all active closures in a linked list and provides a debugfs
		interface to list them, which makes it possible to see asynchronous
		operations that get stuck.

		config BCACHE_ASYNC_REGISTRAION
		bool "Asynchronous device registration (EXPERIMENTAL)"
		depends on BCACHE
		help
		Add a sysfs file /sys/fs/bcache/register_async. Writing registering
		device path into this file will returns immediately and the real
		registration work is handled in kernel work queue in asynchronous
		way.

drivers/md/bcache/super.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2765,7 +2765,9 @@ static int __init bcache_init(void)
		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
		};

Admin message