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path: root/drivers/md/bcache/super.c
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Diffstat (limited to 'drivers/md/bcache/super.c')
-rw-r--r--drivers/md/bcache/super.c52
1 files changed, 32 insertions, 20 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index fc0a31b13ac4..b4d28928dec5 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;
@@ -889,7 +902,7 @@ static void cached_dev_detach_finish(struct work_struct *w)
closure_init_stack(&cl);
BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags));
- BUG_ON(atomic_read(&dc->count));
+ BUG_ON(refcount_read(&dc->count));
mutex_lock(&bch_register_lock);
@@ -1016,7 +1029,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c)
* dc->c must be set before dc->count != 0 - paired with the mb in
* cached_dev_get()
*/
- atomic_set(&dc->count, 1);
+ refcount_set(&dc->count, 1);
/* Block writeback thread, but spawn it */
down_write(&dc->writeback_lock);
@@ -1028,7 +1041,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c)
if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) {
bch_sectors_dirty_init(&dc->disk);
atomic_set(&dc->has_dirty, 1);
- atomic_inc(&dc->count);
+ refcount_inc(&dc->count);
bch_writeback_queue(dc);
}
@@ -1129,9 +1142,6 @@ static int cached_dev_init(struct cached_dev *dc, unsigned block_size)
if (ret)
return ret;
- set_capacity(dc->disk.disk,
- dc->bdev->bd_part->nr_sects - dc->sb.data_offset);
-
dc->disk.disk->queue->backing_dev_info->ra_pages =
max(dc->disk.disk->queue->backing_dev_info->ra_pages,
q->backing_dev_info->ra_pages);
@@ -2085,6 +2095,7 @@ static void bcache_exit(void)
if (bcache_major)
unregister_blkdev(bcache_major, "bcache");
unregister_reboot_notifier(&reboot);
+ mutex_destroy(&bch_register_lock);
}
static int __init bcache_init(void)
@@ -2103,14 +2114,15 @@ static int __init bcache_init(void)
bcache_major = register_blkdev(0, "bcache");
if (bcache_major < 0) {
unregister_reboot_notifier(&reboot);
+ mutex_destroy(&bch_register_lock);
return bcache_major;
}
if (!(bcache_wq = alloc_workqueue("bcache", WQ_MEM_RECLAIM, 0)) ||
!(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) ||
- sysfs_create_files(bcache_kobj, files) ||
bch_request_init() ||
- bch_debug_init(bcache_kobj))
+ bch_debug_init(bcache_kobj) ||
+ sysfs_create_files(bcache_kobj, files))
goto err;
return 0;