korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2025-01-27 00:04:47 +08:00
Code Issues Packages Projects Releases Wiki Activity

rbd: enable extended devt in single-major mode

Browse Source 
If single-major device number allocation scheme is turned on, instead
of reserving 256 minors per device, which imposes a limit of 4096
images mapped at once, reserve 16 minors per device and enable extended
devt feature.  This results in a theoretical limit of 65536 images
mapped at once, and still allows to have more than 15 partititions:
partitions starting with 16th are mapped under major 259 (Block
Extended Major):

$ rbd showmapped
id pool image snap device
0  rbd  b5    -    /dev/rbd0    # no partitions
1  rbd  b2    -    /dev/rbd1    # 40 partitions
2  rbd  b3    -    /dev/rbd2    #  2 partitions

$ cat /proc/partitions
 251        0       1024 rbd0
 251       16       1024 rbd1
 251       17          0 rbd1p1
 251       18          0 rbd1p2
 ...
 251       30          0 rbd1p14
 251       31          0 rbd1p15
 259        0          0 rbd1p16
 259        1          0 rbd1p17
 ...
 259       23          0 rbd1p39
 259       24          0 rbd1p40
 251       32       1024 rbd2
 251       33          0 rbd2p1
 251       34          0 rbd2p2

(major 251 was assigned dynamically at module load time)

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Ilya Dryomov 2013-12-16 19:26:32 +02:00
parent 183028052b
commit 7e513d4366
1 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/block/rbd.c
View File

@ -91,7 +91,8 @@ static int atomic_dec_return_safe(atomic_t *v)
#define RBD_DRV_NAME "rbd"
#define RBD_PART_SHIFT 8
#define RBD_MINORS_PER_MAJOR 256
#define RBD_SINGLE_MAJOR_PART_SHIFT 4
#define RBD_SNAP_DEV_NAME_PREFIX "snap_"
#define RBD_MAX_SNAP_NAME_LEN \
@ -415,12 +416,12 @@ static void rbd_spec_put(struct rbd_spec *spec);
static int rbd_dev_id_to_minor(int dev_id)
{
return dev_id << RBD_PART_SHIFT;
return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT;
}
static int minor_to_rbd_dev_id(int minor)
{
return minor >> RBD_PART_SHIFT;
return minor >> RBD_SINGLE_MAJOR_PART_SHIFT;
}
static BUS_ATTR(add, S_IWUSR, NULL, rbd_add);
@ -3434,7 +3435,9 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
u64 segment_size;
/* create gendisk info */
disk = alloc_disk(1 << RBD_PART_SHIFT);
disk = alloc_disk(single_major ?
(1 << RBD_SINGLE_MAJOR_PART_SHIFT) :
RBD_MINORS_PER_MAJOR);
if (!disk)
return -ENOMEM;
@ -3442,6 +3445,8 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
rbd_dev->dev_id);
disk->major = rbd_dev->major;
disk->first_minor = rbd_dev->minor;
if (single_major)
disk->flags |= GENHD_FL_EXT_DEVT;
disk->fops = &rbd_bd_ops;
disk->private_data = rbd_dev;