spinlock_t lock;
const char *hw_handler_name;
+ char *hw_handler_params;
unsigned nr_priority_groups;
struct list_head priority_groups;
unsigned pg_init_required; /* pg_init needs calling? */
unsigned pg_init_in_progress; /* Only one pg_init allowed at once */
+ wait_queue_head_t pg_init_wait; /* Wait for pg_init completion */
unsigned nr_valid_paths; /* Total number of usable paths */
struct pgpath *current_pgpath;
* can resubmit bios on error.
*/
mempool_t *mpio_pool;
+
+ struct mutex work_mutex;
};
/*
m->queue_io = 1;
INIT_WORK(&m->process_queued_ios, process_queued_ios);
INIT_WORK(&m->trigger_event, trigger_event);
+ init_waitqueue_head(&m->pg_init_wait);
+ mutex_init(&m->work_mutex);
m->mpio_pool = mempool_create_slab_pool(MIN_IOS, _mpio_cache);
if (!m->mpio_pool) {
kfree(m);
}
kfree(m->hw_handler_name);
+ kfree(m->hw_handler_params);
mempool_destroy(m->mpio_pool);
kfree(m);
}
* Path selection
*-----------------------------------------------*/
+static void __pg_init_all_paths(struct multipath *m)
+{
+ struct pgpath *pgpath;
+
+ m->pg_init_count++;
+ m->pg_init_required = 0;
+ list_for_each_entry(pgpath, &m->current_pg->pgpaths, list) {
+ /* Skip failed paths */
+ if (!pgpath->is_active)
+ continue;
+ if (queue_work(kmpath_handlerd, &pgpath->activate_path))
+ m->pg_init_in_progress++;
+ }
+}
+
static void __switch_pg(struct multipath *m, struct pgpath *pgpath)
{
m->current_pg = pgpath->pg;
{
struct multipath *m =
container_of(work, struct multipath, process_queued_ios);
- struct pgpath *pgpath = NULL, *tmp;
+ struct pgpath *pgpath = NULL;
unsigned must_queue = 1;
unsigned long flags;
(!pgpath && !m->queue_if_no_path))
must_queue = 0;
- if (m->pg_init_required && !m->pg_init_in_progress && pgpath) {
- m->pg_init_count++;
- m->pg_init_required = 0;
- list_for_each_entry(tmp, &pgpath->pg->pgpaths, list) {
- if (queue_work(kmpath_handlerd, &tmp->activate_path))
- m->pg_init_in_progress++;
- }
- }
+ if (m->pg_init_required && !m->pg_init_in_progress && pgpath)
+ __pg_init_all_paths(m);
+
out:
spin_unlock_irqrestore(&m->lock, flags);
if (!must_queue)
if (!p)
return ERR_PTR(-ENOMEM);
- r = dm_get_device(ti, shift(as), ti->begin, ti->len,
- dm_table_get_mode(ti->table), &p->path.dev);
+ r = dm_get_device(ti, shift(as), dm_table_get_mode(ti->table),
+ &p->path.dev);
if (r) {
ti->error = "error getting device";
goto bad;
dm_put_device(ti, p->path.dev);
goto bad;
}
+
+ if (m->hw_handler_params) {
+ r = scsi_dh_set_params(q, m->hw_handler_params);
+ if (r < 0) {
+ ti->error = "unable to set hardware "
+ "handler parameters";
+ scsi_dh_detach(q);
+ dm_put_device(ti, p->path.dev);
+ goto bad;
+ }
+ }
}
r = ps->type->add_path(ps, &p->path, as->argc, as->argv, &ti->error);
static int parse_hw_handler(struct arg_set *as, struct multipath *m)
{
unsigned hw_argc;
+ int ret;
struct dm_target *ti = m->ti;
static struct param _params[] = {
request_module("scsi_dh_%s", m->hw_handler_name);
if (scsi_dh_handler_exist(m->hw_handler_name) == 0) {
ti->error = "unknown hardware handler type";
- kfree(m->hw_handler_name);
- m->hw_handler_name = NULL;
- return -EINVAL;
+ ret = -EINVAL;
+ goto fail;
}
- if (hw_argc > 1)
- DMWARN("Ignoring user-specified arguments for "
- "hardware handler \"%s\"", m->hw_handler_name);
+ if (hw_argc > 1) {
+ char *p;
+ int i, j, len = 4;
+
+ for (i = 0; i <= hw_argc - 2; i++)
+ len += strlen(as->argv[i]) + 1;
+ p = m->hw_handler_params = kzalloc(len, GFP_KERNEL);
+ if (!p) {
+ ti->error = "memory allocation failed";
+ ret = -ENOMEM;
+ goto fail;
+ }
+ j = sprintf(p, "%d", hw_argc - 1);
+ for (i = 0, p+=j+1; i <= hw_argc - 2; i++, p+=j+1)
+ j = sprintf(p, "%s", as->argv[i]);
+ }
consume(as, hw_argc - 1);
return 0;
+fail:
+ kfree(m->hw_handler_name);
+ m->hw_handler_name = NULL;
+ return ret;
}
static int parse_features(struct arg_set *as, struct multipath *m)
return r;
}
-static void multipath_dtr(struct dm_target *ti)
+static void multipath_wait_for_pg_init_completion(struct multipath *m)
{
- struct multipath *m = (struct multipath *) ti->private;
+ DECLARE_WAITQUEUE(wait, current);
+ unsigned long flags;
+
+ add_wait_queue(&m->pg_init_wait, &wait);
+
+ while (1) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+
+ spin_lock_irqsave(&m->lock, flags);
+ if (!m->pg_init_in_progress) {
+ spin_unlock_irqrestore(&m->lock, flags);
+ break;
+ }
+ spin_unlock_irqrestore(&m->lock, flags);
+
+ io_schedule();
+ }
+ set_current_state(TASK_RUNNING);
+
+ remove_wait_queue(&m->pg_init_wait, &wait);
+}
+static void flush_multipath_work(struct multipath *m)
+{
flush_workqueue(kmpath_handlerd);
+ multipath_wait_for_pg_init_completion(m);
flush_workqueue(kmultipathd);
flush_scheduled_work();
+}
+
+static void multipath_dtr(struct dm_target *ti)
+{
+ struct multipath *m = ti->private;
+
+ flush_multipath_work(m);
free_multipath(m);
}
return limit_reached;
}
-static void pg_init_done(struct dm_path *path, int errors)
+static void pg_init_done(void *data, int errors)
{
- struct pgpath *pgpath = path_to_pgpath(path);
+ struct pgpath *pgpath = data;
struct priority_group *pg = pgpath->pg;
struct multipath *m = pg->m;
unsigned long flags;
errors = 0;
break;
}
- DMERR("Cannot failover device because scsi_dh_%s was not "
- "loaded.", m->hw_handler_name);
+ DMERR("Could not failover the device: Handler scsi_dh_%s "
+ "Error %d.", m->hw_handler_name, errors);
/*
* Fail path for now, so we do not ping pong
*/
m->current_pgpath = NULL;
m->current_pg = NULL;
}
- } else if (!m->pg_init_required) {
- m->queue_io = 0;
+ } else if (!m->pg_init_required)
pg->bypassed = 0;
- }
- m->pg_init_in_progress--;
- if (!m->pg_init_in_progress)
- queue_work(kmultipathd, &m->process_queued_ios);
+ if (--m->pg_init_in_progress)
+ /* Activations of other paths are still on going */
+ goto out;
+
+ if (!m->pg_init_required)
+ m->queue_io = 0;
+
+ queue_work(kmultipathd, &m->process_queued_ios);
+
+ /*
+ * Wake up any thread waiting to suspend.
+ */
+ wake_up(&m->pg_init_wait);
+
+out:
spin_unlock_irqrestore(&m->lock, flags);
}
static void activate_path(struct work_struct *work)
{
- int ret;
struct pgpath *pgpath =
container_of(work, struct pgpath, activate_path);
- ret = scsi_dh_activate(bdev_get_queue(pgpath->path.dev->bdev));
- pg_init_done(&pgpath->path, ret);
+ scsi_dh_activate(bdev_get_queue(pgpath->path.dev->bdev),
+ pg_init_done, pgpath);
}
/*
queue_if_no_path(m, 0, 1);
}
+static void multipath_postsuspend(struct dm_target *ti)
+{
+ struct multipath *m = ti->private;
+
+ mutex_lock(&m->work_mutex);
+ flush_multipath_work(m);
+ mutex_unlock(&m->work_mutex);
+}
+
/*
* Restore the queue_if_no_path setting.
*/
static int multipath_message(struct dm_target *ti, unsigned argc, char **argv)
{
- int r;
+ int r = -EINVAL;
struct dm_dev *dev;
struct multipath *m = (struct multipath *) ti->private;
action_fn action;
+ mutex_lock(&m->work_mutex);
+
+ if (dm_suspended(ti)) {
+ r = -EBUSY;
+ goto out;
+ }
+
if (argc == 1) {
- if (!strnicmp(argv[0], MESG_STR("queue_if_no_path")))
- return queue_if_no_path(m, 1, 0);
- else if (!strnicmp(argv[0], MESG_STR("fail_if_no_path")))
- return queue_if_no_path(m, 0, 0);
+ if (!strnicmp(argv[0], MESG_STR("queue_if_no_path"))) {
+ r = queue_if_no_path(m, 1, 0);
+ goto out;
+ } else if (!strnicmp(argv[0], MESG_STR("fail_if_no_path"))) {
+ r = queue_if_no_path(m, 0, 0);
+ goto out;
+ }
}
- if (argc != 2)
- goto error;
+ if (argc != 2) {
+ DMWARN("Unrecognised multipath message received.");
+ goto out;
+ }
- if (!strnicmp(argv[0], MESG_STR("disable_group")))
- return bypass_pg_num(m, argv[1], 1);
- else if (!strnicmp(argv[0], MESG_STR("enable_group")))
- return bypass_pg_num(m, argv[1], 0);
- else if (!strnicmp(argv[0], MESG_STR("switch_group")))
- return switch_pg_num(m, argv[1]);
- else if (!strnicmp(argv[0], MESG_STR("reinstate_path")))
+ if (!strnicmp(argv[0], MESG_STR("disable_group"))) {
+ r = bypass_pg_num(m, argv[1], 1);
+ goto out;
+ } else if (!strnicmp(argv[0], MESG_STR("enable_group"))) {
+ r = bypass_pg_num(m, argv[1], 0);
+ goto out;
+ } else if (!strnicmp(argv[0], MESG_STR("switch_group"))) {
+ r = switch_pg_num(m, argv[1]);
+ goto out;
+ } else if (!strnicmp(argv[0], MESG_STR("reinstate_path")))
action = reinstate_path;
else if (!strnicmp(argv[0], MESG_STR("fail_path")))
action = fail_path;
- else
- goto error;
+ else {
+ DMWARN("Unrecognised multipath message received.");
+ goto out;
+ }
- r = dm_get_device(ti, argv[1], ti->begin, ti->len,
- dm_table_get_mode(ti->table), &dev);
+ r = dm_get_device(ti, argv[1], dm_table_get_mode(ti->table), &dev);
if (r) {
DMWARN("message: error getting device %s",
argv[1]);
- return -EINVAL;
+ goto out;
}
r = action_dev(m, dev, action);
dm_put_device(ti, dev);
+out:
+ mutex_unlock(&m->work_mutex);
return r;
-
-error:
- DMWARN("Unrecognised multipath message received.");
- return -EINVAL;
}
static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
list_for_each_entry(pg, &m->priority_groups, list) {
list_for_each_entry(p, &pg->pgpaths, list) {
- ret = fn(ti, p->path.dev, ti->begin, data);
+ ret = fn(ti, p->path.dev, ti->begin, ti->len, data);
if (ret)
goto out;
}
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
- .version = {1, 1, 0},
+ .version = {1, 1, 1},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,
.map_rq = multipath_map,
.rq_end_io = multipath_end_io,
.presuspend = multipath_presuspend,
+ .postsuspend = multipath_postsuspend,
.resume = multipath_resume,
.status = multipath_status,
.message = multipath_message,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff