bcache: partition support: add 16 minors per bcacheN device

Signed-off-by: Eric Wheeler <bcache@linux.ewheeler.net>
Tested-by: Wido den Hollander <wido@widodh.nl>

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index b33dd3b..3a19cbc 100644 (file)
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -58,6 +58,7 @@ static wait_queue_head_t unregister_wait;
 struct workqueue_struct *bcache_wq;
 
 #define BTREE_MAX_PAGES                (256 * 1024 / PAGE_SIZE)
+#define BCACHE_MINORS          16 /* partition support */
 
 /* Superblock */
 
@@ -783,8 +784,10 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
        if (minor < 0)
                return minor;
 
+       minor *= BCACHE_MINORS;
+
        if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio))) ||
-           !(d->disk = alloc_disk(1))) {
+           !(d->disk = alloc_disk(BCACHE_MINORS))) {
                ida_simple_remove(&bcache_minor, minor);
                return -ENOMEM;
        }