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bcache: share register sysfs with async register 

Previously the experimental async registration uses a separate sysfs
file register_async. Now the async registration code seems working well
for a while, we can do furtuher testing with it now.

This patch changes the async bcache registration shares the same sysfs
file /sys/fs/bcache/register (and register_quiet). Async registration
will be default behavior if BCACHE_ASYNC_REGISTRATION is set in kernel
configure. By default, BCACHE_ASYNC_REGISTRATION is not configured yet.

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2020-10-01 14:50:42 +08:00 committed by Jens Axboe
parent dc4d137ee3
commit a58e88bfdc
1 changed files with 7 additions and 5 deletions
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12
drivers/md/bcache/super.c
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@ -2448,7 +2448,6 @@ static ssize_t bch_pending_bdevs_cleanup(struct kobject *k,
kobj_attribute_write(register, register_bcache);
kobj_attribute_write(register_quiet, register_bcache);
kobj_attribute_write(register_async, register_bcache);
kobj_attribute_write(pendings_cleanup, bch_pending_bdevs_cleanup);
static bool bch_is_open_backing(struct block_device *bdev)
@ -2571,6 +2570,11 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
struct cache_sb_disk *sb_disk;
struct block_device *bdev;
ssize_t ret;
bool async_registration = false;
#ifdef CONFIG_BCACHE_ASYNC_REGISTRATION
async_registration = true;
#endif
ret = -EBUSY;
err = "failed to reference bcache module";
@ -2624,7 +2628,8 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
goto out_blkdev_put;
err = "failed to register device";
if (attr == &ksysfs_register_async) {
if (async_registration) {
/* register in asynchronous way */
struct async_reg_args *args =
kzalloc(sizeof(struct async_reg_args), GFP_KERNEL);
@ -2887,9 +2892,6 @@ static int __init bcache_init(void)
static const struct attribute *files[] = {
&ksysfs_register.attr,
&ksysfs_register_quiet.attr,
#ifdef CONFIG_BCACHE_ASYNC_REGISTRATION
&ksysfs_register_async.attr,
#endif
&ksysfs_pendings_cleanup.attr,
NULL
};