glusterfs.git/xlators/storage/bd_map/src/bd_map.c, branch v3.4.2

BD Backend: CLI to create a full/linked clone of a image

2012-11-29T17:40:14+00:00

A new CLI command added to support cloning/snapshotting of a LV device

Syntax is:
$ gluster bd clone :/ 

$ gluster bd snapshot :/  

BUG: 805138
Change-Id: Idc2ac14525a3998329c742bf85a06326cac8cd54
Signed-off-by: M. Mohan Kumar 
Reviewed-on: http://review.gluster.org/3719
Tested-by: Gluster Build System 
Reviewed-by: Vijay Bellur

BD Backend: CLI commands to create/delete image

2012-11-29T17:39:53+00:00

Cli commands  added to create/delete a LV device.

The following command creates lv in a given vg.
$ gluster bd create :/ 

The following command deletes lv in a given vg.
$ gluster bd delete :/

BUG: 805138
Change-Id: Ie4e100eca14e2ee32cf2bb4dd064b17230d673bf
Signed-off-by: M. Mohan Kumar 
Reviewed-on: http://review.gluster.org/3718
Tested-by: Gluster Build System 
Reviewed-by: Vijay Bellur

BD Backend: Rename LV

2012-11-29T17:38:42+00:00

BUG: 805138
Change-Id: I18c64435e66ede148c58d412a0639f45554209c8
Signed-off-by: M. Mohan Kumar 
Reviewed-on: http://review.gluster.org/3558
Tested-by: Gluster Build System 
Reviewed-by: Vijay Bellur

BD Backend: Extend size of file (LV)

2012-11-29T17:38:06+00:00

Use the truncate interface to increase the size of file (LV).

FIXME: lvm2 library does not provide any interface to extend size of LV.
So lvextend binary is forked to achieve the same

BUG: 805138
Change-Id: If4c0bd112364437b89e091b7f53764b8e6e01a28
Signed-off-by: M. Mohan Kumar 
Reviewed-on: http://review.gluster.org/3557
Tested-by: Gluster Build System 
Reviewed-by: Vijay Bellur

BD Backend: Full clone and linked clone

2012-11-29T17:37:44+00:00

FIXME: There is no lvm2 api to create a LV snapshot. This patch forks
lvcreate binary to achieve the same.

BUG: 805138
Change-Id: Icdbead16f797162fe6a31a672b619ce6a0391235
Signed-off-by: M. Mohan Kumar 
Reviewed-on: http://review.gluster.org/3556
Tested-by: Gluster Build System 
Reviewed-by: Vijay Bellur

BD Backend: Unlink a file (LV)

2012-11-29T17:37:26+00:00

BUG: 805138
Change-Id: I53d8a4bc09cbd9766ba937887cadd7ac475017ba
Signed-off-by: M. Mohan Kumar 
Reviewed-on: http://review.gluster.org/3555
Tested-by: Gluster Build System 
Reviewed-by: Vijay Bellur

BD Backend: Create a new file (LV)

2012-11-29T17:36:56+00:00

Add support to create a new file (LV) under a directory (VG). By
default created LV is of one logical extent size.

Also setattr/fsetattr interfaces added as part of this patch.

BUG: 805138
Change-Id: I51752b707b3766ab277d623ce574537346f376c9
Signed-off-by: M. Mohan Kumar 
Reviewed-on: http://review.gluster.org/3554
Tested-by: Gluster Build System 
Reviewed-by: Vijay Bellur

BD Backend: Write support

2012-11-29T17:36:06+00:00

BUG: 805138
Change-Id: I4a672fc58ee61dead99e0adcd46d7771f3fdd730
Signed-off-by: M. Mohan Kumar 
Reviewed-on: http://review.gluster.org/3553
Tested-by: Gluster Build System 
Reviewed-by: Vijay Bellur

BD Backend: Open,read and related calls support for LV

2012-11-29T17:35:43+00:00

BUG: 805138
Change-Id: I811c179d4244342537dbedb8a24fd2ec628942ed
Signed-off-by: M. Mohan Kumar 
Reviewed-on: http://review.gluster.org/3552
Tested-by: Gluster Build System 
Reviewed-by: Vijay Bellur

xlators: Add Block Device(BD) backend translator

2012-11-29T17:35:20+00:00

Add a new server storage xlator 'bd mapper'. Intention of this xlator is
to add block device backend support to gluster. It exports block devices
as regular files to the gluster client.

The immediate goal of this translator is to use logical volumes to
store VM images and expose them as files to QEMU/KVM.

Given Volume group is represented as directory and its logical
volumes as files.

By exporting LUNs/LVs as regular files, it becomes possible to:
* Associate each VM to a LV/LUN
* Use file system commands like cp to take copy of VM images
* Create linked clones of VM  by doing LV snapshot at server
side
* Implement thin provisioning by developing a qcow2 translator

As of now this patchset maps only logical volumes. BD Mapper volume
file specifies which Volume group to export to the client. BD xlator
exports the volume group as a directory and all logical volumes under that
as regular files.

BD xlator uses lvm2-devel APIs for getting the list of Volume Groups
and Logical Volumes in the system.

The eventual goal of this work is to support thin provisioning,
snapshot, copy etc of VM images seamlessly in glusterfs storage environment

BUG: 805138
Change-Id: I13b69d39d7fd199c101c8e9e4f2cf10772bdc3dd
Signed-off-by: M. Mohan Kumar 
Reviewed-on: http://review.gluster.org/3551
Reviewed-by: Vijay Bellur 
Tested-by: Vijay Bellur