bcache: Use bd_link_disk_holder()

Signed-off-by: Kent Overstreet <koverstreet@google.com>

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index b3601476f7ddef46a2ef716f4167067da866596f..c8046bc4aa57e0f12df3db3bc2495eea3be97564 100644 (file)
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -661,6 +661,35 @@ void bcache_device_stop(struct bcache_device *d)
                closure_queue(&d->cl);
 }
 
+static void bcache_device_unlink(struct bcache_device *d)
+{
+       unsigned i;
+       struct cache *ca;
+
+       sysfs_remove_link(&d->c->kobj, d->name);
+       sysfs_remove_link(&d->kobj, "cache");
+
+       for_each_cache(ca, d->c, i)
+               bd_unlink_disk_holder(ca->bdev, d->disk);
+}
+
+static void bcache_device_link(struct bcache_device *d, struct cache_set *c,
+                              const char *name)
+{
+       unsigned i;
+       struct cache *ca;
+
+       for_each_cache(ca, d->c, i)
+               bd_link_disk_holder(ca->bdev, d->disk);
+
+       snprintf(d->name, BCACHEDEVNAME_SIZE,
+                "%s%u", name, d->id);
+
+       WARN(sysfs_create_link(&d->kobj, &c->kobj, "cache") ||
+            sysfs_create_link(&c->kobj, &d->kobj, d->name),
+            "Couldn't create device <-> cache set symlinks");
+}
+
 static void bcache_device_detach(struct bcache_device *d)
 {
        lockdep_assert_held(&bch_register_lock);
@@ -676,6 +705,8 @@ static void bcache_device_detach(struct bcache_device *d)
                atomic_set(&d->detaching, 0);
        }
 
+       bcache_device_unlink(d);
+
        d->c->devices[d->id] = NULL;
        closure_put(&d->c->caching);
        d->c = NULL;
@@ -693,17 +724,6 @@ static void bcache_device_attach(struct bcache_device *d, struct cache_set *c,
        closure_get(&c->caching);
 }
 
-static void bcache_device_link(struct bcache_device *d, struct cache_set *c,
-                              const char *name)
-{
-       snprintf(d->name, BCACHEDEVNAME_SIZE,
-                "%s%u", name, d->id);
-
-       WARN(sysfs_create_link(&d->kobj, &c->kobj, "cache") ||
-            sysfs_create_link(&c->kobj, &d->kobj, d->name),
-            "Couldn't create device <-> cache set symlinks");
-}
-
 static void bcache_device_free(struct bcache_device *d)
 {
        lockdep_assert_held(&bch_register_lock);
@@ -804,6 +824,7 @@ void bch_cached_dev_run(struct cached_dev *dc)
        }
 
        add_disk(d->disk);
+       bd_link_disk_holder(dc->bdev, dc->disk.disk);
 #if 0
        char *env[] = { "SYMLINK=label" , NULL };
        kobject_uevent_env(&disk_to_dev(d->disk)->kobj, KOBJ_CHANGE, env);
@@ -823,9 +844,6 @@ static void cached_dev_detach_finish(struct work_struct *w)
        BUG_ON(!atomic_read(&dc->disk.detaching));
        BUG_ON(atomic_read(&dc->count));
 
-       sysfs_remove_link(&dc->disk.c->kobj, dc->disk.name);
-       sysfs_remove_link(&dc->disk.kobj, "cache");
-
        mutex_lock(&bch_register_lock);
 
        memset(&dc->sb.set_uuid, 0, 16);
@@ -940,7 +958,6 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c)
        }
 
        bcache_device_attach(&dc->disk, c, u - c->uuids);
-       bcache_device_link(&dc->disk, c, "bdev");
        list_move(&dc->list, &c->cached_devs);
        calc_cached_dev_sectors(c);
 
@@ -958,6 +975,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c)
        }
 
        bch_cached_dev_run(dc);
+       bcache_device_link(&dc->disk, c, "bdev");
 
        pr_info("Caching %s as %s on set %pU",
                bdevname(dc->bdev, buf), dc->disk.disk->disk_name,
@@ -981,6 +999,7 @@ static void cached_dev_free(struct closure *cl)
 
        mutex_lock(&bch_register_lock);
 
+       bd_unlink_disk_holder(dc->bdev, dc->disk.disk);
        bcache_device_free(&dc->disk);
        list_del(&dc->list);
 
@@ -1123,8 +1142,7 @@ static void flash_dev_flush(struct closure *cl)
 {
        struct bcache_device *d = container_of(cl, struct bcache_device, cl);
 
-       sysfs_remove_link(&d->c->kobj, d->name);
-       sysfs_remove_link(&d->kobj, "cache");
+       bcache_device_unlink(d);
        kobject_del(&d->kobj);
        continue_at(cl, flash_dev_free, system_wq);
 }