Document the fact that iterate_device method shouldn't block.
 

---
include/linux/device-mapper.h | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index aa09503..8ceb13a 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -148,6 +148,10 @@ struct target_type {
dm_ioctl_fn ioctl;
dm_merge_fn merge;
dm_busy_fn busy;
+
+ /*
+ * iterate_devices must not block.
+ */
dm_iterate_devices_fn iterate_devices;
dm_io_hints_fn io_hints;

--
1.7.5.4

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