From 92efc15241ceebc23451691971897020e8563a70 Mon Sep 17 00:00:00 2001 From: Zhen Wei Date: Fri, 8 Dec 2006 00:48:17 -0700 Subject: 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 Signed-off-by: Mark Fasheh --- fs/ocfs2/cluster/heartbeat.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'fs/ocfs2') diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c index a25ef5a5038..277ca67a2ad 100644 --- a/fs/ocfs2/cluster/heartbeat.c +++ b/fs/ocfs2/cluster/heartbeat.c @@ -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, }; -- cgit v1.2.3