diff options
| -rw-r--r-- | drivers/md/bcache/super.c | 37 |
1 files changed, 25 insertions, 12 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index fc0a31b13ac4..a478d1ac0480 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -53,12 +53,15 @@ LIST_HEAD(bch_cache_sets); static LIST_HEAD(uncached_devices); static int bcache_major; -static DEFINE_IDA(bcache_minor); +static DEFINE_IDA(bcache_device_idx); 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 */ +/* limitation of partitions number on single bcache device */ +#define BCACHE_MINORS 128 +/* limitation of bcache devices number on single system */ +#define BCACHE_DEVICE_IDX_MAX ((1U << MINORBITS)/BCACHE_MINORS) /* Superblock */ @@ -721,6 +724,16 @@ static void bcache_device_attach(struct bcache_device *d, struct cache_set *c, closure_get(&c->caching); } +static inline int first_minor_to_idx(int first_minor) +{ + return (first_minor/BCACHE_MINORS); +} + +static inline int idx_to_first_minor(int idx) +{ + return (idx * BCACHE_MINORS); +} + static void bcache_device_free(struct bcache_device *d) { lockdep_assert_held(&bch_register_lock); @@ -734,7 +747,8 @@ static void bcache_device_free(struct bcache_device *d) if (d->disk && d->disk->queue) blk_cleanup_queue(d->disk->queue); if (d->disk) { - ida_simple_remove(&bcache_minor, d->disk->first_minor); + ida_simple_remove(&bcache_device_idx, + first_minor_to_idx(d->disk->first_minor)); put_disk(d->disk); } @@ -751,7 +765,7 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size, { struct request_queue *q; size_t n; - int minor; + int idx; if (!d->stripe_size) d->stripe_size = 1 << 31; @@ -776,25 +790,24 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size, if (!d->full_dirty_stripes) return -ENOMEM; - minor = ida_simple_get(&bcache_minor, 0, MINORMASK + 1, GFP_KERNEL); - if (minor < 0) - return minor; - - minor *= BCACHE_MINORS; + idx = ida_simple_get(&bcache_device_idx, 0, + BCACHE_DEVICE_IDX_MAX, GFP_KERNEL); + if (idx < 0) + return idx; if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio), BIOSET_NEED_BVECS | BIOSET_NEED_RESCUER)) || !(d->disk = alloc_disk(BCACHE_MINORS))) { - ida_simple_remove(&bcache_minor, minor); + ida_simple_remove(&bcache_device_idx, idx); return -ENOMEM; } set_capacity(d->disk, sectors); - snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", minor); + snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", idx); d->disk->major = bcache_major; - d->disk->first_minor = minor; + d->disk->first_minor = idx_to_first_minor(idx); d->disk->fops = &bcache_ops; d->disk->private_data = d; |