diff options
Diffstat (limited to 'drivers/block/brd.c')
| -rw-r--r-- | drivers/block/brd.c | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/drivers/block/brd.c b/drivers/block/brd.c index b7f51e4594f8..dba1c32e1ddf 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -35,10 +35,6 @@ */ struct brd_device { int brd_number; - int brd_refcnt; - loff_t brd_offset; - loff_t brd_sizelimit; - unsigned brd_blocksize; struct request_queue *brd_queue; struct gendisk *brd_disk; @@ -440,11 +436,11 @@ static int rd_nr; int rd_size = CONFIG_BLK_DEV_RAM_SIZE; static int max_part; static int part_shift; -module_param(rd_nr, int, 0); +module_param(rd_nr, int, S_IRUGO); MODULE_PARM_DESC(rd_nr, "Maximum number of brd devices"); -module_param(rd_size, int, 0); +module_param(rd_size, int, S_IRUGO); MODULE_PARM_DESC(rd_size, "Size of each RAM disk in kbytes."); -module_param(max_part, int, 0); +module_param(max_part, int, S_IRUGO); MODULE_PARM_DESC(max_part, "Maximum number of partitions per RAM disk"); MODULE_LICENSE("GPL"); MODULE_ALIAS_BLOCKDEV_MAJOR(RAMDISK_MAJOR); @@ -552,7 +548,7 @@ static struct kobject *brd_probe(dev_t dev, int *part, void *data) struct kobject *kobj; mutex_lock(&brd_devices_mutex); - brd = brd_init_one(dev & MINORMASK); + brd = brd_init_one(MINOR(dev) >> part_shift); kobj = brd ? get_disk(brd->brd_disk) : ERR_PTR(-ENOMEM); mutex_unlock(&brd_devices_mutex); @@ -575,25 +571,39 @@ static int __init brd_init(void) * * (1) if rd_nr is specified, create that many upfront, and this * also becomes a hard limit. - * (2) if rd_nr is not specified, create 1 rd device on module - * load, user can further extend brd device by create dev node - * themselves and have kernel automatically instantiate actual - * device on-demand. + * (2) if rd_nr is not specified, create CONFIG_BLK_DEV_RAM_COUNT + * (default 16) rd device on module load, user can further + * extend brd device by create dev node themselves and have + * kernel automatically instantiate actual device on-demand. */ part_shift = 0; - if (max_part > 0) + if (max_part > 0) { part_shift = fls(max_part); + /* + * Adjust max_part according to part_shift as it is exported + * to user space so that user can decide correct minor number + * if [s]he want to create more devices. + * + * Note that -1 is required because partition 0 is reserved + * for the whole disk. + */ + max_part = (1UL << part_shift) - 1; + } + + if ((1UL << part_shift) > DISK_MAX_PARTS) + return -EINVAL; + if (rd_nr > 1UL << (MINORBITS - part_shift)) return -EINVAL; if (rd_nr) { nr = rd_nr; - range = rd_nr; + range = rd_nr << part_shift; } else { nr = CONFIG_BLK_DEV_RAM_COUNT; - range = 1UL << (MINORBITS - part_shift); + range = 1UL << MINORBITS; } if (register_blkdev(RAMDISK_MAJOR, "ramdisk")) @@ -632,7 +642,7 @@ static void __exit brd_exit(void) unsigned long range; struct brd_device *brd, *next; - range = rd_nr ? rd_nr : 1UL << (MINORBITS - part_shift); + range = rd_nr ? rd_nr << part_shift : 1UL << MINORBITS; list_for_each_entry_safe(brd, next, &brd_devices, brd_list) brd_del_one(brd); |