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ocfs2: export heartbeat thread pid via configfs 

The patch allows the ocfs2 heartbeat thread to prioritize I/O which may
help cut down on spurious fencing. Most of this will be in the tools -
we can have a pid configfs attribute and let userspace (ocfs2_hb_ctl)
calls the ioprio_set syscall after starting heartbeat, but only cfq
scheduler supports I/O priorities now.

Signed-off-by: Zhen Wei <zwei@novell.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Zhen Wei 2006-12-08 00:48:17 -07:00 committed by Mark Fasheh
parent 7f4a2a97e3
commit 92efc15241
1 changed files with 17 additions and 0 deletions
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17
fs/ocfs2/cluster/heartbeat.c
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@ -1447,6 +1447,15 @@ out:
return ret;
}
static ssize_t o2hb_region_pid_read(struct o2hb_region *reg,
char *page)
{
if (!reg->hr_task)
return 0;
return sprintf(page, "%u\n", reg->hr_task->pid);
}
struct o2hb_region_attribute {
struct configfs_attribute attr;
ssize_t (*show)(struct o2hb_region *, char *);
@ -1485,11 +1494,19 @@ static struct o2hb_region_attribute o2hb_region_attr_dev = {
.store = o2hb_region_dev_write,
};
static struct o2hb_region_attribute o2hb_region_attr_pid = {
.attr = { .ca_owner = THIS_MODULE,
.ca_name = "pid",
.ca_mode = S_IRUGO | S_IRUSR },
.show = o2hb_region_pid_read,
};
static struct configfs_attribute *o2hb_region_attrs[] = {
&o2hb_region_attr_block_bytes.attr,
&o2hb_region_attr_start_block.attr,
&o2hb_region_attr_blocks.attr,
&o2hb_region_attr_dev.attr,
&o2hb_region_attr_pid.attr,
NULL,
};