path: root/Documentation
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authorLinus Torvalds <torvalds@linux-foundation.org>2012-06-02 17:39:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-06-02 17:39:40 -0700
commit912afc3616b94c5c4af584972c7f5903b53cf15a (patch)
tree3edd4596fe53ce5bc8224b1cccd5d34dcac040a7 /Documentation
parentMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff)
parentdm thin: provide userspace access to pool metadata (diff)
Merge tag 'dm-3.5-changes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm
Pull device-mapper updates from Alasdair G Kergon: "Improve multipath's retrying mechanism in some defined circumstances and provide a simple reserve/release mechanism for userspace tools to access thin provisioning metadata while the pool is in use." * tag 'dm-3.5-changes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm: dm thin: provide userspace access to pool metadata dm thin: use slab mempools dm mpath: allow ioctls to trigger pg init dm mpath: delay retry of bypassed pg dm mpath: reduce size of struct multipath
Diffstat (limited to 'Documentation')
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
--- a/Documentation/device-mapper/thin-provisioning.txt
+++ b/Documentation/device-mapper/thin-provisioning.txt
@@ -287,6 +287,17 @@ iii) Messages
the current transaction id is when you change it with this
compare-and-swap message.
+ reserve_metadata_snap
+ 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_metadata_snap
+ Release a previously reserved copy of the data mapping btree.
'thin' target