Commit a9e2ae39 authored by Mark Fasheh's avatar Mark Fasheh
Browse files

ocfs2: Better I/O error handling in heartbeat 



Propagate errors received in o2hb_bio_end_io() back to the heartbeat thread
so it can skip re-arming the timer.

Signed-off-by: default avatarMark Fasheh <mark.fasheh@oracle.com>
parent 2cd98885

fs/ocfs2/cluster/heartbeat.c

+32 −8
Original line number Diff line number Diff line
@@ -153,6 +153,7 @@ struct o2hb_region { 
struct o2hb_bio_wait_ctxt {

	atomic_t          wc_num_reqs;

	struct completion wc_io_complete;

	int               wc_error;

};



static void o2hb_write_timeout(void *arg)
@@ -186,6 +187,7 @@ static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc, 
{

	atomic_set(&wc->wc_num_reqs, num_ios);

	init_completion(&wc->wc_io_complete);

	wc->wc_error = 0;

}



/* Used in error paths too */
@@ -218,8 +220,10 @@ static int o2hb_bio_end_io(struct bio *bio, 
{

	struct o2hb_bio_wait_ctxt *wc = bio->bi_private;



	if (error)

	if (error) {

		mlog(ML_ERROR, "IO Error %d\n", error);

		wc->wc_error = error;

	}



	if (bio->bi_size)

		return 1;
@@ -390,6 +394,8 @@ static int o2hb_read_slots(struct o2hb_region *reg, 


bail_and_wait:

	o2hb_wait_on_io(reg, &wc);

	if (wc.wc_error && !status)

		status = wc.wc_error;



	if (bios) {

		for(i = 0; i < num_bios; i++)
@@ -790,20 +796,24 @@ static int o2hb_highest_node(unsigned long *nodes, 
	return highest;

}



static void o2hb_do_disk_heartbeat(struct o2hb_region *reg)

static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)

{

	int i, ret, highest_node, change = 0;

	unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)];

	struct bio *write_bio;

	struct o2hb_bio_wait_ctxt write_wc;



	if (o2nm_configured_node_map(configured_nodes, sizeof(configured_nodes)))

		return;

	ret = o2nm_configured_node_map(configured_nodes,

				       sizeof(configured_nodes));

	if (ret) {

		mlog_errno(ret);

		return ret;

	}



	highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES);

	if (highest_node >= O2NM_MAX_NODES) {

		mlog(ML_NOTICE, "ocfs2_heartbeat: no configured nodes found!\n");

		return;

		return -EINVAL;

	}



	/* No sense in reading the slots of nodes that don't exist
@@ -813,7 +823,7 @@ static void o2hb_do_disk_heartbeat(struct o2hb_region *reg) 
	ret = o2hb_read_slots(reg, highest_node + 1);

	if (ret < 0) {

		mlog_errno(ret);

		return;

		return ret;

	}



	/* With an up to date view of the slots, we can check that no
@@ -831,7 +841,7 @@ static void o2hb_do_disk_heartbeat(struct o2hb_region *reg) 
	ret = o2hb_issue_node_write(reg, &write_bio, &write_wc);

	if (ret < 0) {

		mlog_errno(ret);

		return;

		return ret;

	}



	i = -1;
@@ -847,6 +857,15 @@ static void o2hb_do_disk_heartbeat(struct o2hb_region *reg) 
	 */

	o2hb_wait_on_io(reg, &write_wc);

	bio_put(write_bio);

	if (write_wc.wc_error) {

		/* Do not re-arm the write timeout on I/O error - we

		 * can't be sure that the new block ever made it to

		 * disk */

		mlog(ML_ERROR, "Write error %d on device \"%s\"\n",

		     write_wc.wc_error, reg->hr_dev_name);

		return write_wc.wc_error;

	}



	o2hb_arm_write_timeout(reg);



	/* let the person who launched us know when things are steady */
@@ -854,6 +873,8 @@ static void o2hb_do_disk_heartbeat(struct o2hb_region *reg) 
		if (atomic_dec_and_test(&reg->hr_steady_iterations))

			wake_up(&o2hb_steady_queue);

	}



	return 0;

}



/* Subtract b from a, storing the result in a. a *must* have a larger
@@ -913,7 +934,10 @@ static int o2hb_thread(void *data) 
		 * likely to time itself out. */

		do_gettimeofday(&before_hb);



		o2hb_do_disk_heartbeat(reg);

		i = 0;

		do {

			ret = o2hb_do_disk_heartbeat(reg);

		} while (ret && ++i < 2);



		do_gettimeofday(&after_hb);

		elapsed_msec = o2hb_elapsed_msecs(&before_hb, &after_hb);