Wido den Hollander 98782f8899 rbd: Use RBD fast-diff for querying actual volume allocation ...

Since Ceph version Infernalis (9.2.0) the new fast-diff mechanism
of RBD allows for querying actual volume usage.

Prior to this version there was no easy and fast way to query how
much allocation a RBD volume had inside a Ceph cluster.

To use the fast-diff feature it needs to be enabled per RBD image
and is only supported by Ceph cluster running version Infernalis
(9.2.0) or newer.

Without the fast-diff feature enabled libvirt will report an allocation
identical to the image capacity. This is how libvirt behaves currently.

'virsh vol-info rbd/image2' might output for example:

  Name:           image2
  Type:           network
  Capacity:       1,00 GiB
  Allocation:     124,00 MiB

Newly created volumes will have the fast-diff feature enabled if the
backing Ceph cluster supports it.

Signed-off-by: Wido den Hollander <wido@widodh.nl>

2016-02-12 16:02:05 -05:00

..

parthelper.c

storage: Add new flag for libvirt_parthelper

2016-01-19 13:02:59 -05:00

storage_backend_disk.c

storage: Add new flag for libvirt_parthelper

2016-01-19 13:02:59 -05:00

storage_backend_disk.h

maint: fix up copyright notice inconsistencies

2012-09-20 16:30:55 -06:00

storage_backend_fs.c

storage: Check FS pool source during virStorageBackendFileSystemIsMounted

2015-12-15 14:33:04 -05:00

storage_backend_fs.h

storage: add file functions for local and block files

2014-02-14 10:47:57 +01:00

storage_backend_gluster.c

Revert "Restore skipping of setting capacity"

2015-03-02 08:07:11 +01:00

storage_backend_gluster.h

storage: Add storage file backends for gluster

2014-02-14 11:07:23 +01:00

storage_backend_iscsi.c

iscsi: do not fail to stop a stopped pool

2015-04-30 13:05:10 +02:00

storage_backend_iscsi.h

Move functions using iscsiadm to viriscsi.c

2014-03-20 18:04:50 +01:00

storage_backend_logical.c

Prohibit verbose strcat

2016-02-11 08:05:16 +01:00

storage_backend_logical.h

maint: fix up copyright notice inconsistencies

2012-09-20 16:30:55 -06:00

storage_backend_mpath.c

storage: Add readflags for backend error processing

2015-12-09 16:31:14 -05:00

storage_backend_mpath.h

Change file names in comments to match the files they are in

2014-03-10 14:26:04 +01:00

storage_backend_rbd.c

rbd: Use RBD fast-diff for querying actual volume allocation

2016-02-12 16:02:05 -05:00

storage_backend_rbd.h

maint: fix up copyright notice inconsistencies

2012-09-20 16:30:55 -06:00

storage_backend_scsi.c

storage: Ignore block devices that fail format detection

2015-12-09 16:31:15 -05:00

storage_backend_scsi.h

storage: Move virStorageBackendSCSIGetHostNumber into iscsi backend

2013-04-08 18:41:06 +08:00

storage_backend_sheepdog.c

virStringListLength: Ensure const correctness

2016-02-09 15:44:58 -05:00

storage_backend_sheepdog.h

Change file names in comments to match the files they are in

2014-03-10 14:26:04 +01:00

storage_backend_zfs.c

storage: zfs: flexible use of 'volmode' option

2016-02-04 03:16:50 +03:00

storage_backend_zfs.h

storage: ZFS support

2014-08-12 19:40:20 +04:00

storage_backend.c

Clean up usage of 'ret' variable

2016-02-11 08:05:16 +01:00

storage_backend.h

storage: Handle readflags errors

2015-12-09 16:31:14 -05:00

storage_driver.c

storageVolCreateXMLFrom: Check if backend knows how to createVol

2016-02-12 16:16:58 +01:00

storage_driver.h

storage: Introduce virStoragePoolObjFindPoolByUUID

2015-11-12 06:30:32 -05:00