diff options
Diffstat (limited to 'drivers/block/loop.c')
| -rw-r--r-- | drivers/block/loop.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 91ebb007416c..f7f163557aa0 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -82,6 +82,9 @@ static LIST_HEAD(loop_devices); static DEFINE_MUTEX(loop_devices_mutex); +static int max_part; +static int part_shift; + /* * Transfer functions */ @@ -692,6 +695,8 @@ static int loop_change_fd(struct loop_device *lo, struct file *lo_file, goto out_putf; fput(old_file); + if (max_part > 0) + ioctl_by_bdev(bdev, BLKRRPART, 0); return 0; out_putf: @@ -819,6 +824,8 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file, } lo->lo_state = Lo_bound; wake_up_process(lo->lo_thread); + if (max_part > 0) + ioctl_by_bdev(bdev, BLKRRPART, 0); return 0; out_clr: @@ -919,6 +926,8 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev) fput(filp); /* This is safe: open() is still holding a reference. */ module_put(THIS_MODULE); + if (max_part > 0) + ioctl_by_bdev(bdev, BLKRRPART, 0); return 0; } @@ -1360,6 +1369,8 @@ static struct block_device_operations lo_fops = { static int max_loop; module_param(max_loop, int, 0); MODULE_PARM_DESC(max_loop, "Maximum number of loop devices"); +module_param(max_part, int, 0); +MODULE_PARM_DESC(max_part, "Maximum number of partitions per loop device"); MODULE_LICENSE("GPL"); MODULE_ALIAS_BLOCKDEV_MAJOR(LOOP_MAJOR); @@ -1412,7 +1423,7 @@ static struct loop_device *loop_alloc(int i) if (!lo->lo_queue) goto out_free_dev; - disk = lo->lo_disk = alloc_disk(1); + disk = lo->lo_disk = alloc_disk(1 << part_shift); if (!disk) goto out_free_queue; @@ -1422,7 +1433,7 @@ static struct loop_device *loop_alloc(int i) init_waitqueue_head(&lo->lo_event); spin_lock_init(&lo->lo_lock); disk->major = LOOP_MAJOR; - disk->first_minor = i; + disk->first_minor = i << part_shift; disk->fops = &lo_fops; disk->private_data = lo; disk->queue = lo->lo_queue; @@ -1502,7 +1513,12 @@ static int __init loop_init(void) * themselves and have kernel automatically instantiate actual * device on-demand. */ - if (max_loop > 1UL << MINORBITS) + + part_shift = 0; + if (max_part > 0) + part_shift = fls(max_part); + + if (max_loop > 1UL << (MINORBITS - part_shift)) return -EINVAL; if (max_loop) { @@ -1510,7 +1526,7 @@ static int __init loop_init(void) range = max_loop; } else { nr = 8; - range = 1UL << MINORBITS; + range = 1UL << (MINORBITS - part_shift); } if (register_blkdev(LOOP_MAJOR, "loop")) @@ -1549,7 +1565,7 @@ static void __exit loop_exit(void) unsigned long range; struct loop_device *lo, *next; - range = max_loop ? max_loop : 1UL << MINORBITS; + range = max_loop ? max_loop : 1UL << (MINORBITS - part_shift); list_for_each_entry_safe(lo, next, &loop_devices, lo_list) loop_del_one(lo); |