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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-06-02 17:39:40 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-06-02 17:39:40 -0700 |
| commit | 912afc3616b94c5c4af584972c7f5903b53cf15a (patch) | |
| tree | 3edd4596fe53ce5bc8224b1cccd5d34dcac040a7 /Documentation | |
| parent | 4fc3acf2918fa158dc651a0c824a23944e956919 (diff) | |
| parent | cc8394d86f045b86ff303d3c9e4ce47d97148951 (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')
| -rw-r--r-- | Documentation/device-mapper/thin-provisioning.txt | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/device-mapper/thin-provisioning.txt b/Documentation/device-mapper/thin-provisioning.txt index 3370bc4d7b9..f5cfc62b7ad 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 ------------- |