[Qemu-block] [PATCH v4 0/3] blockjob: correct backup cluster size for backups

[John Snow]

Backups sometimes need a non-64KiB transfer cluster size.
See patch #2 for the detailed justificaton.

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v4:
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02: Polished the error message.

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v3:
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01: +R-B
02: Added failure mode for bdrv_get_info, including critical failure for when
    we don't have a backing file but couldn't retrieve the cluster_size info.

===
v2:
===

01: Removed "sectors_per_cluster" as a cached property of the Backup Block Job,
    In favor of recomputing it with a small function where needed.
    (I like v1 more. Thoughts?)
02: Expand correction to all backup modes instead of just incremental.
    Added credit: Thanks to Fam Z for noticing this problem!
03: Minor phrasing change in a comment.
    Added r-b.

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For convenience, this branch is available at:
https://github.com/jnsnow/qemu.git branch incremental-granularity-fix
https://github.com/jnsnow/qemu/tree/incremental-granularity-fix

This version is tagged incremental-granularity-fix-v4:
https://github.com/jnsnow/qemu/releases/tag/incremental-granularity-fix-v4

John Snow (3):
  block/backup: make backup cluster size configurable
  block/backup: avoid copying less than full target clusters
  iotests/124: Add cluster_size mismatch test

 block/backup.c             | 87 ++++++++++++++++++++++++++++++----------------
 tests/qemu-iotests/124     | 58 ++++++++++++++++++++++++++++---
 tests/qemu-iotests/124.out |  4 +--
 3 files changed, 112 insertions(+), 37 deletions(-)

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2.4.3