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Improve multipath's retrying mechanism in some defined circumstances

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and provide a simple reserve/release mechanism for userspace tools to
 access thin provisioning metadata while the pool is in use.
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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
This commit is contained in:
Linus Torvalds 2012-06-02 17:39:40 -07:00
commit 912afc3616
6 changed files with 322 additions and 90 deletions
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11
Documentation/device-mapper/thin-provisioning.txt
View file

@ -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
-------------