dm: export suspended state to targets

This patch adds the exported dm_suspended() function so that targets
can check whether or not they are suspended.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

2 files changed, 12 insertions, 0 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index e0702bf37935..3167480b532c 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2684,6 +2684,17 @@ int dm_suspended_md(struct mapped_device *md)
         return test_bit(DMF_SUSPENDED, &md->flags);
 }
 
+int dm_suspended(struct dm_target *ti)
+{
+        struct mapped_device *md = dm_table_get_md(ti->table);
+        int r = dm_suspended_md(md);
+
+        dm_put(md);
+
+        return r;
+}
+EXPORT_SYMBOL_GPL(dm_suspended);
+
 int dm_noflush_suspending(struct dm_target *ti)
 {
         struct mapped_device *md = dm_table_get_md(ti->table);
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index fca0d31bbf2d..d4c9c0b88adc 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -235,6 +235,7 @@ void dm_uevent_add(struct mapped_device *md, struct list_head *elist);
 const char *dm_device_name(struct mapped_device *md);
 int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid);
 struct gendisk *dm_disk(struct mapped_device *md);
+int dm_suspended(struct dm_target *ti);
 int dm_noflush_suspending(struct dm_target *ti);
 union map_info *dm_get_mapinfo(struct bio *bio);
 union map_info *dm_get_rq_mapinfo(struct request *rq);