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Commit 92efc152 authored by Zhen Wei's avatar Zhen Wei Committed by Mark Fasheh
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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: default avatarZhen Wei <zwei@novell.com>
Signed-off-by: default avatarMark Fasheh <mark.fasheh@oracle.com>
parent 7f4a2a97

fs/ocfs2/cluster/heartbeat.c

+17 −0
Original line number Diff line number Diff line
@@ -1447,6 +1447,15 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, 
	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,

};