[Qemu-devel] [PATCH v5 0/3] qcow2: Patch for shrinking qcow2 disk image

[Jun Li <junmuzi@gmail.com>]

v5:
  Add qemu-iotests for qcow2 shrinking. Do some modifications based on MAX's suggestions in v4.

v4:
  Add deal with COW clusters in l2 table. When using COW, some of (l2_entry >>
s->cluster_bits) will larger than s->refcount_table_size, so need to discard
this l2_entry.

v3:
  Fixed host cluster leak.


In file block/qcow2.c, just using ftruncate to fix host cluster leak.

In file block/qcow2-cluster.c, just re-copy qcow2_grow_l1_table to
realize qcow2_shrink_l1_and_l2_table.

In file block/qcow2-refcount.c, also update the realization to handle self-describing
refcount blocks in function update_refcount.

Thanks.


Jun Li (3):
  qcow2: Add qcow2_shrink_l1_and_l2_table for qcow2 shrinking
  qcow2: add update refcount table realization for update_refcount
  qcow2: Add qemu-iotests for qcow2 shrinking

 block/qcow2-cluster.c      | 182 +++++++++++++++++++++++++++++++++++++++++++++
 block/qcow2-refcount.c     |  49 +++++++++++-
 block/qcow2.c              |  37 ++++++++-
 block/qcow2.h              |   2 +
 tests/qemu-iotests/110     |  76 +++++++++++++++++++
 tests/qemu-iotests/110.out |  13 ++++
 tests/qemu-iotests/group   |   1 +
 7 files changed, 356 insertions(+), 4 deletions(-)
 create mode 100755 tests/qemu-iotests/110
 create mode 100644 tests/qemu-iotests/110.out

-- 
1.9.3