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[PATCH] device-mapper multipath: Use private workqueue

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dm-mpath.c needs to use a private workqueue (like other dm targets already do)
to avoid interfering with users of the default workqueue.

Signed-Off-By: Alasdair G Kergon <agk@redhat.com>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Lars Marowsky-Bree <lmb@suse.de>
Signed-off-by: <mikenc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alasdair G Kergon 2005-05-05 16:16:07 -07:00 committed by Linus Torvalds
parent b84b0287a8
commit c557308e1f
1 changed files with 22 additions and 10 deletions
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32
drivers/md/dm-mpath.c
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@ -101,6 +101,7 @@ typedef int (*action_fn) (struct pgpath *pgpath);
static kmem_cache_t *_mpio_cache; static kmem_cache_t *_mpio_cache;
struct workqueue_struct *kmultipathd;
static void process_queued_ios(void *data); static void process_queued_ios(void *data);
static void trigger_event(void *data); static void trigger_event(void *data);
@ -308,7 +309,7 @@ static int map_io(struct multipath *m, struct bio *bio, struct mpath_io *mpio,
bio_list_add(&m->queued_ios, bio); bio_list_add(&m->queued_ios, bio);
m->queue_size++; m->queue_size++;
if (m->pg_init_required || !m->queue_io) if (m->pg_init_required || !m->queue_io)
schedule_work(&m->process_queued_ios); queue_work(kmultipathd, &m->process_queued_ios);
pgpath = NULL; pgpath = NULL;
r = 0; r = 0;
} else if (!pgpath) } else if (!pgpath)
@ -334,7 +335,7 @@ static int queue_if_no_path(struct multipath *m, unsigned queue_if_no_path)
m->queue_if_no_path = queue_if_no_path; m->queue_if_no_path = queue_if_no_path;
if (!m->queue_if_no_path) if (!m->queue_if_no_path)
schedule_work(&m->process_queued_ios); queue_work(kmultipathd, &m->process_queued_ios);
spin_unlock_irqrestore(&m->lock, flags); spin_unlock_irqrestore(&m->lock, flags);
@ -800,7 +801,7 @@ static int fail_path(struct pgpath *pgpath)
if (pgpath == m->current_pgpath) if (pgpath == m->current_pgpath)
m->current_pgpath = NULL; m->current_pgpath = NULL;
schedule_work(&m->trigger_event); queue_work(kmultipathd, &m->trigger_event);
out: out:
spin_unlock_irqrestore(&m->lock, flags); spin_unlock_irqrestore(&m->lock, flags);
@ -837,9 +838,9 @@ static int reinstate_path(struct pgpath *pgpath)
m->current_pgpath = NULL; m->current_pgpath = NULL;
if (!m->nr_valid_paths++) if (!m->nr_valid_paths++)
schedule_work(&m->process_queued_ios); queue_work(kmultipathd, &m->process_queued_ios);
schedule_work(&m->trigger_event); queue_work(kmultipathd, &m->trigger_event);
out: out:
spin_unlock_irqrestore(&m->lock, flags); spin_unlock_irqrestore(&m->lock, flags);
@ -883,7 +884,7 @@ static void bypass_pg(struct multipath *m, struct priority_group *pg,
spin_unlock_irqrestore(&m->lock, flags); spin_unlock_irqrestore(&m->lock, flags);
schedule_work(&m->trigger_event); queue_work(kmultipathd, &m->trigger_event);
} }
/* /*
@ -913,7 +914,7 @@ static int switch_pg_num(struct multipath *m, const char *pgstr)
} }
spin_unlock_irqrestore(&m->lock, flags); spin_unlock_irqrestore(&m->lock, flags);
schedule_work(&m->trigger_event); queue_work(kmultipathd, &m->trigger_event);
return 0; return 0;
} }
@ -968,7 +969,7 @@ void dm_pg_init_complete(struct path *path, unsigned err_flags)
m->current_pgpath = NULL; m->current_pgpath = NULL;
m->current_pg = NULL; m->current_pg = NULL;
} }
schedule_work(&m->process_queued_ios); queue_work(kmultipathd, &m->process_queued_ios);
spin_unlock_irqrestore(&m->lock, flags); spin_unlock_irqrestore(&m->lock, flags);
} }
@ -1018,7 +1019,7 @@ static int do_end_io(struct multipath *m, struct bio *bio,
bio_list_add(&m->queued_ios, bio); bio_list_add(&m->queued_ios, bio);
m->queue_size++; m->queue_size++;
if (!m->queue_io) if (!m->queue_io)
schedule_work(&m->process_queued_ios); queue_work(kmultipathd, &m->process_queued_ios);
spin_unlock(&m->lock); spin_unlock(&m->lock);
return 1; /* io not complete */ return 1; /* io not complete */
@ -1057,7 +1058,7 @@ static void multipath_presuspend(struct dm_target *ti)
spin_lock_irqsave(&m->lock, flags); spin_lock_irqsave(&m->lock, flags);
m->suspended = 1; m->suspended = 1;
if (m->queue_if_no_path) if (m->queue_if_no_path)
schedule_work(&m->process_queued_ios); queue_work(kmultipathd, &m->process_queued_ios);
spin_unlock_irqrestore(&m->lock, flags); spin_unlock_irqrestore(&m->lock, flags);
} }
@ -1274,6 +1275,15 @@ static int __init dm_multipath_init(void)
return -EINVAL; return -EINVAL;
} }
kmultipathd = create_workqueue("kmpathd");
if (!kmultipathd) {
DMERR("%s: failed to create workqueue kmpathd",
multipath_target.name);
dm_unregister_target(&multipath_target);
kmem_cache_destroy(_mpio_cache);
return -ENOMEM;
}
DMINFO("dm-multipath version %u.%u.%u loaded", DMINFO("dm-multipath version %u.%u.%u loaded",
multipath_target.version[0], multipath_target.version[1], multipath_target.version[0], multipath_target.version[1],
multipath_target.version[2]); multipath_target.version[2]);
@ -1285,6 +1295,8 @@ static void __exit dm_multipath_exit(void)
{ {
int r; int r;
destroy_workqueue(kmultipathd);
r = dm_unregister_target(&multipath_target); r = dm_unregister_target(&multipath_target);
if (r < 0) if (r < 0)
DMERR("%s: target unregister failed %d", DMERR("%s: target unregister failed %d",