Diffstat (limited to 'Documentation/device-mapper/thin-provisioning.txt')
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/device-mapper/thin-provisioning.txt b/Documentation/device-mapper/thin-provisioning.txt
index 3370bc4d7b98..f5cfc62b7ad3 100644
@@ -287,6 +287,17 @@ iii) Messages
the current transaction id is when you change it with this
+ Reserve a copy of the data mapping btree for use by userland.
+ This allows userland to inspect the mappings as they were when
+ this message was executed. Use the pool's status command to
+ get the root block associated with the metadata snapshot.
+ Release a previously reserved copy of the data mapping btree.