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

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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>
This commit is contained in:
Jens Axboe 2007-11-07 13:54:07 +01:00
parent 0e7be9edb9
commit 8ec680e4c3
1 changed files with 4 additions and 0 deletions
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4
fs/ioprio.c
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@ -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;
}