[sheepdog] [PATCH 0/4] add vdi backup and restore support

[MORITA Kazutaka]

An incremental backup is useful to reduce backup data size.  This
series adds support for vdi backup and restore commands.  With theses
patches, we can create incremental backup files between snapshots as
follows.

  $ collie vdi create test 4G
  $ echo snap1 | collie vdi write test 0 512
  $ collie vdi snapshot test -s snap1
  $ echo snap2 | collie vdi write test 0 512
  $ collie vdi snapshot test -s snap2

  (create an incremental backup between snap1 and snap2)
  $ collie vdi backup test -F snap1 -s snap2 /tmp/backup
  $ collie vdi list
    Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
  s test         1  4.0 GB  4.0 MB  0.0 MB 2012-09-10 01:27   7c2b25     1         snap1
  s test         2  4.0 GB  4.0 MB  0.0 MB 2012-09-10 01:28   7c2b26     1         snap2
    test         3  4.0 GB  0.0 MB  4.0 MB 2012-09-10 01:28   7c2b27     1              

  (restore vdi with the backup file)
  $ collie vdi restore test -s snap1 /tmp/backup
  restoring /tmp/backup... done

  (restored image is created as a new snapshot [id=3])
  $ collie vdi tree 
  test---[2012-09-10 01:27]-+-[2012-09-10 01:28]---(you are here)
                            `-[2012-09-10 01:29]
  $ collie vdi list
    Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
  s test         1  4.0 GB  4.0 MB  0.0 MB 2012-09-10 01:27   7c2b25     1         snap1
  s test         2  4.0 GB  4.0 MB  0.0 MB 2012-09-10 01:28   7c2b26     1         snap2
  s test         3  4.0 GB  4.0 MB  0.0 MB 2012-09-10 01:29   7c2b28     1              
    test         4  4.0 GB  0.0 MB  4.0 MB 2012-09-10 01:29   7c2b29     1              
  $ collie vdi read test 0 512 -s 3
  snap2


Thanks,

Kazutaka


MORITA Kazutaka (4):
  collie: add helper function to read vdi objects
  collie: add vdi backup support
  collie: vdi restore support
  tests: add test to check vdi backup and restore

 collie/common.c |    2 +
 collie/vdi.c    |  516 +++++++++++++++++++++++++++++++++++++++++++------------
 man/collie.8    |    6 +
 tests/041       |   72 ++++++++
 tests/041.out   |   64 +++++++
 tests/group     |    1 +
 6 files changed, 549 insertions(+), 112 deletions(-)
 create mode 100755 tests/041
 create mode 100644 tests/041.out

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1.7.2.5