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>

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 6bfa771..d34495d 100644 (file)
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -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
        };