@@ -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.
@@ -2767,7 +2767,9 @@ 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
};
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> --- drivers/md/bcache/Kconfig | 9 +++++++++ drivers/md/bcache/super.c | 2 ++ 2 files changed, 11 insertions(+)