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authorNamhyung Kim <namhyung@gmail.com>2011-05-26 21:06:50 +0200
committerJens Axboe <jaxboe@fusionio.com>2011-05-26 21:06:50 +0200
commit8892cbaf686fb18a5f0558b9fd7773b32c0c7852 (patch)
treed42261b88e9ead68894e226d8d9afc838fa7cfb1 /drivers/block
parent13868b76ab8135389fe1d8cf1c6a4847c9fef0a7 (diff)
brd: export module parameters
Export 'rd_nr', 'rd_size' and 'max_part' parameters to sysfs so user can know that how many devices are allowed, how big each device is and how many partitions are supported. If 'max_part' is 0, it means simply the device doesn't support partitioning. Also note that 'max_part' can be adjusted to power of 2 minus 1 form if needed. User should check this value after the module loading if he/she want to use that number correctly (i.e. fdisk, mknod, etc.). Signed-off-by: Namhyung Kim <namhyung@gmail.com> Cc: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/brd.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index d904d0da292..dba1c32e1dd 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -436,11 +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);
@@ -578,9 +578,20 @@ static int __init brd_init(void)
*/
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;