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authorJens Axboe <jens.axboe@oracle.com>2007-11-07 13:54:07 +0100
committerJens Axboe <jens.axboe@oracle.com>2007-11-07 13:54:07 +0100
commit8ec680e4c3ec818efd1652f15199ed1c216ab550 (patch)
tree5f58d77e0661d720cbf1443aa5c1153ee930d37c /fs/ioprio.c
parent0e7be9edb9134f833278c381b6feabb54b875208 (diff)
downloadlinux-8ec680e4c3ec818efd1652f15199ed1c216ab550.tar.gz
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>
Diffstat (limited to 'fs/ioprio.c')
-rw-r--r--fs/ioprio.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ioprio.c b/fs/ioprio.c
index d6ff77e8e7e..e4e01bc7f33 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -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;
}