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Don't set I/O Scheduler for Partitions

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ZFS should only change the i/o scheduler for a disk when it has
ownership of the whole disk.  This is basically the same logic as
adjusting the write cache behavior on a disk.  This change updates
the vdev disk code to skip partitions when setting the i/o scheduler.

Closes #152
This commit is contained in:
Brian Behlendorf 2011-03-10 13:34:17 -08:00
parent a6cba65cca
commit 04516a45b2
1 changed files with 4 additions and 0 deletions
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4
module/zfs/vdev_disk.c
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@ -131,6 +131,10 @@ vdev_elevator_switch(vdev_t *v, char *elevator)
char *envp[] = { NULL };
int count = 0, error;
/* Skip devices which are not whole disks (partitions) */
if (!v->vdev_wholedisk)
return (0);
/* Skip devices without schedulers (loop, ram, dm, etc) */
if (!q->elevator || !blk_queue_stackable(q))
return (0);