Bug 814827

Summary: dm thin: support "held roots" for live userspace metadata access
Product: Red Hat Enterprise Linux 6 Reporter: Alasdair Kergon <agk>
Component: kernelAssignee: Joe Thornber <thornber>
Status: CLOSED DUPLICATE QA Contact: Cluster QE <mspqa-list>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 6.4CC: agk, dwysocha, heinzm, jbrassow, msnitzer, prajnoha, prockai, thornber, zkabelac
Target Milestone: rcKeywords: FutureFeature
Target Release: ---   
Hardware: Unspecified   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Enhancement
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-07-30 20:39:11 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 814841    

Description Alasdair Kergon 2012-04-20 19:14:45 UTC
Allow userspace to hold the root of an LV metadata tree, which guarantees the kernel will not remove any of the metadata in that tree until userspace releases the hold.

Comment 1 RHEL Program Management 2012-07-10 08:25:36 UTC
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Comment 2 RHEL Program Management 2012-07-10 23:36:35 UTC
This request was erroneously removed from consideration in Red Hat Enterprise Linux 6.4, which is currently under development.  This request will be evaluated for inclusion in Red Hat Enterprise Linux 6.4.

Comment 3 Alasdair Kergon 2012-07-30 19:33:09 UTC
upstream commit cc8394d86f045b86ff303d3c9e4ce47d97148951
dm thin: provide userspace access to pool metadata