dm mpath: log device name

Make the mapped device structure accessible to hardware handlers so error
messages can include the device name.

Signed-off-by: Edward Goggin <egoggin@emc.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/md/dm-hw-handler.h b/drivers/md/dm-hw-handler.h
index 32eff28..e0832e6 100644 (file)
--- a/drivers/md/dm-hw-handler.h
+++ b/drivers/md/dm-hw-handler.h
@@ -16,6 +16,7 @@
 struct hw_handler_type;
 struct hw_handler {
        struct hw_handler_type *type;
+       struct mapped_device *md;
        void *context;
 };
 

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 3aa0135..de54b39 100644 (file)
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -668,6 +668,9 @@ static int parse_hw_handler(struct arg_set *as, struct multipath *m)
                return -EINVAL;
        }
 
+       m->hw_handler.md = dm_table_get_md(ti->table);
+       dm_put(m->hw_handler.md);
+
        r = hwht->create(&m->hw_handler, hw_argc - 1, as->argv);
        if (r) {
                dm_put_hw_handler(hwht);

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 11a98df..2717a35 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1236,6 +1236,7 @@ void dm_put(struct mapped_device *md)
                free_dev(md);
        }
 }
+EXPORT_SYMBOL_GPL(dm_put);
 
 /*
  * Process the deferred bios