dm: add dm_deleting_md function

Add dm_deleting_md to check whether or not a given mapped
device is currently being deleted.

Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 4a95e8fa3607..604a5f2a2383 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -89,6 +89,11 @@ int dm_target_iterate(void (*iter_func)(struct target_type *tt,
 int dm_split_args(int *argc, char ***argvp, char *input);
 
 /*
+ * Is this mapped_device being deleted?
+ */
+int dm_deleting_md(struct mapped_device *md);
+
+/*
  * The device-mapper can be driven through one of two interfaces;
  * ioctl or filesystem, depending which patch you have applied.
  */