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path: root/drivers/md/dm-mpath.c
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Diffstat (limited to 'drivers/md/dm-mpath.c')
-rw-r--r--drivers/md/dm-mpath.c63
1 files changed, 26 insertions, 37 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 545abcc25c4..838f01b1dd3 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -35,6 +35,7 @@ struct pgpath {
struct dm_path path;
struct work_struct deactivate_path;
+ struct work_struct activate_path;
};
#define path_to_pgpath(__pgp) container_of((__pgp), struct pgpath, path)
@@ -64,8 +65,6 @@ struct multipath {
spinlock_t lock;
const char *hw_handler_name;
- struct work_struct activate_path;
- struct pgpath *pgpath_to_activate;
unsigned nr_priority_groups;
struct list_head priority_groups;
unsigned pg_init_required; /* pg_init needs calling? */
@@ -128,6 +127,7 @@ static struct pgpath *alloc_pgpath(void)
if (pgpath) {
pgpath->is_active = 1;
INIT_WORK(&pgpath->deactivate_path, deactivate_path);
+ INIT_WORK(&pgpath->activate_path, activate_path);
}
return pgpath;
@@ -160,7 +160,6 @@ static struct priority_group *alloc_priority_group(void)
static void free_pgpaths(struct list_head *pgpaths, struct dm_target *ti)
{
- unsigned long flags;
struct pgpath *pgpath, *tmp;
struct multipath *m = ti->private;
@@ -169,10 +168,6 @@ static void free_pgpaths(struct list_head *pgpaths, struct dm_target *ti)
if (m->hw_handler_name)
scsi_dh_detach(bdev_get_queue(pgpath->path.dev->bdev));
dm_put_device(ti, pgpath->path.dev);
- spin_lock_irqsave(&m->lock, flags);
- if (m->pgpath_to_activate == pgpath)
- m->pgpath_to_activate = NULL;
- spin_unlock_irqrestore(&m->lock, flags);
free_pgpath(pgpath);
}
}
@@ -202,7 +197,6 @@ static struct multipath *alloc_multipath(struct dm_target *ti)
m->queue_io = 1;
INIT_WORK(&m->process_queued_ios, process_queued_ios);
INIT_WORK(&m->trigger_event, trigger_event);
- INIT_WORK(&m->activate_path, activate_path);
m->mpio_pool = mempool_create_slab_pool(MIN_IOS, _mpio_cache);
if (!m->mpio_pool) {
kfree(m);
@@ -427,8 +421,8 @@ static void process_queued_ios(struct work_struct *work)
{
struct multipath *m =
container_of(work, struct multipath, process_queued_ios);
- struct pgpath *pgpath = NULL;
- unsigned init_required = 0, must_queue = 1;
+ struct pgpath *pgpath = NULL, *tmp;
+ unsigned must_queue = 1;
unsigned long flags;
spin_lock_irqsave(&m->lock, flags);
@@ -446,19 +440,15 @@ static void process_queued_ios(struct work_struct *work)
must_queue = 0;
if (m->pg_init_required && !m->pg_init_in_progress && pgpath) {
- m->pgpath_to_activate = pgpath;
m->pg_init_count++;
m->pg_init_required = 0;
- m->pg_init_in_progress = 1;
- init_required = 1;
+ list_for_each_entry(tmp, &pgpath->pg->pgpaths, list) {
+ if (queue_work(kmpath_handlerd, &tmp->activate_path))
+ m->pg_init_in_progress++;
+ }
}
-
out:
spin_unlock_irqrestore(&m->lock, flags);
-
- if (init_required)
- queue_work(kmpath_handlerd, &m->activate_path);
-
if (!must_queue)
dispatch_queued_ios(m);
}
@@ -946,9 +936,13 @@ static int reinstate_path(struct pgpath *pgpath)
pgpath->is_active = 1;
- m->current_pgpath = NULL;
- if (!m->nr_valid_paths++ && m->queue_size)
+ if (!m->nr_valid_paths++ && m->queue_size) {
+ m->current_pgpath = NULL;
queue_work(kmultipathd, &m->process_queued_ios);
+ } else if (m->hw_handler_name && (m->current_pg == pgpath->pg)) {
+ if (queue_work(kmpath_handlerd, &pgpath->activate_path))
+ m->pg_init_in_progress++;
+ }
dm_path_uevent(DM_UEVENT_PATH_REINSTATED, m->ti,
pgpath->path.dev->name, m->nr_valid_paths);
@@ -1124,35 +1118,30 @@ static void pg_init_done(struct dm_path *path, int errors)
spin_lock_irqsave(&m->lock, flags);
if (errors) {
- DMERR("Could not failover device. Error %d.", errors);
- m->current_pgpath = NULL;
- m->current_pg = NULL;
+ if (pgpath == m->current_pgpath) {
+ DMERR("Could not failover device. Error %d.", errors);
+ m->current_pgpath = NULL;
+ m->current_pg = NULL;
+ }
} else if (!m->pg_init_required) {
m->queue_io = 0;
pg->bypassed = 0;
}
- m->pg_init_in_progress = 0;
- queue_work(kmultipathd, &m->process_queued_ios);
+ m->pg_init_in_progress--;
+ if (!m->pg_init_in_progress)
+ queue_work(kmultipathd, &m->process_queued_ios);
spin_unlock_irqrestore(&m->lock, flags);
}
static void activate_path(struct work_struct *work)
{
int ret;
- struct multipath *m =
- container_of(work, struct multipath, activate_path);
- struct dm_path *path;
- unsigned long flags;
+ struct pgpath *pgpath =
+ container_of(work, struct pgpath, activate_path);
- spin_lock_irqsave(&m->lock, flags);
- path = &m->pgpath_to_activate->path;
- m->pgpath_to_activate = NULL;
- spin_unlock_irqrestore(&m->lock, flags);
- if (!path)
- return;
- ret = scsi_dh_activate(bdev_get_queue(path->dev->bdev));
- pg_init_done(path, ret);
+ ret = scsi_dh_activate(bdev_get_queue(pgpath->path.dev->bdev));
+ pg_init_done(&pgpath->path, ret);
}
/*