openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

rbd: default to single-major device number scheme 

It's been 3.5 years, let's turn it on by default.  Support in rbd(8)
utility goes back to pre-firefly, "rbd map" has been loading the module
with single_major=Y ever since.  However, if the module is already
loaded (whether by hand or at boot time), we end up with single_major=N.
Also, some people don't install rbd(8) and use the sysfs interface
directly.

(With single-major=N, a major number is consumed for every mapping,
imposing a limit of ~240 rbd images per host.  single-major=Y allows
mapping thousands of rbd images on a single machine.)

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
This commit is contained in:
Ilya Dryomov 2017-11-13 10:35:40 +01:00
parent b11270853f
commit 3cfa3b16dd
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/block/rbd.c
View File

@ -449,12 +449,11 @@ static DEFINE_IDA(rbd_dev_id_ida);
static struct workqueue_struct *rbd_wq;
/*
* Default to false for now, as single-major requires >= 0.75 version of
* userspace rbd utility.
* single-major requires >= 0.75 version of userspace rbd utility.
*/
static bool single_major = false;
static bool single_major = true;
module_param(single_major, bool, S_IRUGO);
MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: false)");
MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)");
static int rbd_img_request_submit(struct rbd_img_request *img_request);