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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>
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@ -1447,6 +1447,15 @@ out:
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return ret;
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}
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static ssize_t o2hb_region_pid_read(struct o2hb_region *reg,
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char *page)
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{
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if (!reg->hr_task)
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return 0;
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return sprintf(page, "%u\n", reg->hr_task->pid);
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}
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struct o2hb_region_attribute {
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struct configfs_attribute attr;
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ssize_t (*show)(struct o2hb_region *, char *);
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@ -1485,11 +1494,19 @@ static struct o2hb_region_attribute o2hb_region_attr_dev = {
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.store = o2hb_region_dev_write,
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};
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static struct o2hb_region_attribute o2hb_region_attr_pid = {
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.attr = { .ca_owner = THIS_MODULE,
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.ca_name = "pid",
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.ca_mode = S_IRUGO | S_IRUSR },
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.show = o2hb_region_pid_read,
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};
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static struct configfs_attribute *o2hb_region_attrs[] = {
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&o2hb_region_attr_block_bytes.attr,
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&o2hb_region_attr_start_block.attr,
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&o2hb_region_attr_blocks.attr,
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&o2hb_region_attr_dev.attr,
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&o2hb_region_attr_pid.attr,
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NULL,
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};
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