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ocfs2: Better I/O error handling in heartbeat

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

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh 2006-03-24 14:20:17 -08:00
parent 2cd9888590
commit a9e2ae3917
1 changed files with 32 additions and 8 deletions
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40
fs/ocfs2/cluster/heartbeat.c
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@ -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);