diff options
| -rw-r--r-- | drivers/md/dm-mpath.c | 16 | ||||
| -rw-r--r-- | drivers/md/dm.c | 12 |
2 files changed, 23 insertions, 5 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index 71dd65aa31b6..c2fcf28b4c70 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -63,6 +63,7 @@ struct multipath { 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? */ @@ -146,6 +147,7 @@ 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; @@ -154,6 +156,10 @@ 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); } } @@ -421,6 +427,7 @@ static void process_queued_ios(struct work_struct *work) __choose_pgpath(m); pgpath = m->current_pgpath; + m->pgpath_to_activate = m->current_pgpath; if ((pgpath && !m->queue_io) || (!pgpath && !m->queue_if_no_path)) @@ -1093,8 +1100,15 @@ static void activate_path(struct work_struct *work) int ret; struct multipath *m = container_of(work, struct multipath, activate_path); - struct dm_path *path = &m->current_pgpath->path; + struct dm_path *path; + unsigned long flags; + 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); } diff --git a/drivers/md/dm.c b/drivers/md/dm.c index bca448e11878..ace998ce59f6 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -837,12 +837,14 @@ static int dm_merge_bvec(struct request_queue *q, struct dm_table *map = dm_get_table(md); struct dm_target *ti; sector_t max_sectors; - int max_size; + int max_size = 0; if (unlikely(!map)) - return 0; + goto out; ti = dm_table_find_target(map, bvm->bi_sector); + if (!dm_target_is_valid(ti)) + goto out_table; /* * Find maximum amount of I/O that won't need splitting @@ -861,14 +863,16 @@ static int dm_merge_bvec(struct request_queue *q, if (max_size && ti->type->merge) max_size = ti->type->merge(ti, bvm, biovec, max_size); +out_table: + dm_table_put(map); + +out: /* * Always allow an entire first page */ if (max_size <= biovec->bv_len && !(bvm->bi_size >> SECTOR_SHIFT)) max_size = biovec->bv_len; - dm_table_put(map); - return max_size; } |