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rbd: modprobe with single_major=Y on newer kernels

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On kernels that support it, and if 'rbd map' is given a chance to
modprobe, turn on single-major device number allocation scheme.  For
users who for some reason don't want it, the workaround is to insert
the rbd module manually before executing the first 'rbd map' command.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
This commit is contained in:
Ilya Dryomov 2013-12-13 17:40:52 +02:00
parent 8a473bcc99
commit eae8531e42
1 changed files with 11 additions and 1 deletions
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12
src/rbd.cc
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@ -1695,7 +1695,17 @@ static int do_kernel_add(const char *poolname, const char *imgname,
// modprobe the rbd module if /sys/bus/rbd doesn't exist
struct stat sb;
if ((stat("/sys/bus/rbd", &sb) < 0) || (!S_ISDIR(sb.st_mode))) {
r = system("/sbin/modprobe rbd");
// turn on single-major device number allocation scheme if the
// kernel supports it
const char *cmd = "/sbin/modprobe rbd";
r = system("/sbin/modinfo -F parm rbd | /bin/grep -q ^single_major:");
if (r == 0) {
cmd = "/sbin/modprobe rbd single_major=Y";
} else if (r < 0) {
cerr << "rbd: error executing modinfo as shell command!" << std::endl;
}
r = system(cmd);
if (r) {
if (r < 0)
cerr << "rbd: error executing modprobe as shell command!" << std::endl;