Commit 8ec680e4 authored Nov 07, 2007 by Jens Axboe

ioprio: allow sys_ioprio_set() value of 0 to reset ioprio setting

Normally io priorities follow the CPU nice, unless a specific scheduling
class has been set. Once that is set, there's no way to reset the
behaviour to 'none' so that it follows CPU nice again.

Currently passing in 0 as the ioprio class/value will return -1/EINVAL,
change that to allow resetting of a set scheduling class.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

parent 0e7be9ed

fs/ioprio.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -78,6 +78,10 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
		if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
		break;
		case IOPRIO_CLASS_NONE:
		if (data)
		return -EINVAL;
		break;
		default:
		return -EINVAL;
		}