dm thin: document representation of <highest mapped sector> when there is none

Signed-off-by: mulhern <amulhern@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>

dm thin: document representation of <highest mapped sector> when there is none
Signed-off-by: mulhern <amulhern@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2bc8a61c · mulhern · Mike Snitzer · 9b28a110 · 2bc8a61c
Commit 2bc8a61c authored Nov 27, 2017 by mulhern Committed by Mike Snitzer Jan 17, 2018
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Documentation/device-mapper/thin-provisioning.txt Documentation/device-mapper/thin-provisioning.txt +3 -0

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--- a/Documentation/device-mapper/thin-provisioning.txt
+++ b/Documentation/device-mapper/thin-provisioning.txt
@@ -396,3 +396,6 @@ ii) Status
 	If the pool has encountered device errors and failed, the status
 	will just contain the string 'Fail'.  The userspace recovery
 	tools should then be used.
+
+    In the case where <nr mapped sectors> is 0, there is no highest
+    mapped sector and the value of <highest mapped sector> is unspecified.