Hi,

The following series adds two parameters to qemu-img map:
1. start-offset: mapping starting offset.
2. max-length: the length of the mapping.

These parameters proved useful when mapping large disk spread across
long store file chains. It allows us to bound the execution time of each
qemu-img map execution as well as recover from failed mapping
operations. In addition the map operation can divided to
multiple independent tasks.

V2 changes:
1. add error reporting to cvtnum.
2. add image length validation in img_map.
3. rebase over QEMU 5.0.

Eyal Moscovici (5):
  qemu-img: remove check that cvtnum value > MAX_INT
  qemu_img: add error report to cvtnum
  qemu-img: validate image length in img_map
  qemu-img: refactor dump_map_entry JSON format output
  qemu-img: Add --start-offset and --max-length to map

 docs/tools/qemu-img.rst    |   2 +-
 qemu-img-cmds.hx           |   4 +-
 qemu-img.c                 | 106 ++++++++++++++++++++++---------------
 tests/qemu-iotests/049.out |   4 +-
 4 files changed, 67 insertions(+), 49 deletions(-)

-- 
2.17.2 (Apple Git-113)

On 5/6/20 4:34 PM, Eyal Moscovici wrote:
> Hi,
> 
> The following series adds two parameters to qemu-img map:
> 1. start-offset: mapping starting offset.
> 2. max-length: the length of the mapping.
> 
> These parameters proved useful when mapping large disk spread across
> long store file chains. It allows us to bound the execution time of each
> qemu-img map execution as well as recover from failed mapping
> operations. In addition the map operation can divided to
> multiple independent tasks.
> 
> V2 changes:
> 1. add error reporting to cvtnum.
> 2. add image length validation in img_map.
> 3. rebase over QEMU 5.0.

It's better to post a v2 as a new top-level thread rather than buried 
in-reply-to the v1 thread; among other things, burying a reply can cause 
automated patch tooling to miss the updated series.

But since I see it, I'll review.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org