[PATCH 1/2] [device-mapper] Document the fact that iterate_device method shouldn't block.

[Joe Thornber <ejt@xxxxxxxxxx>]

---
 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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