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bcache: configure the asynchronous registertion to be experimental

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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>
This commit is contained in:
Coly Li 2020-05-27 12:01:55 +08:00 committed by Jens Axboe
parent 9e23ccf8f0
commit 0c8d3fcead
2 changed files with 11 additions and 0 deletions
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9
drivers/md/bcache/Kconfig
View File

@ -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.

2
drivers/md/bcache/super.c
View File

@ -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
};