[Qemu-devel] [PATCH v8 0/4] Add subcommand compare for qemu-img

[Miroslav Rezanina <mrezanin@redhat.com>]

This is 8th version of patch adding compare subcommand that
compares two images. Compare has following criteria:
 - only data part is compared
 - unallocated sectors are not read
 - in case of different image size, exceeding part of bigger disk has
 to be zeroed/unallocated to compare rest
 - qemu-img returns:
    - 0 if images are identical
    - 1 if images differ
    - 2 on error

v8:
 - minor grammar fixes (no behavior change)
 
v7:
 - split patch into pieces
 - Quiet mode added for all relevant subcommands
 - check non-shared part of disk after shared one
 - minor docummentation and naming fixes

v6:
 - added handling -?, -h options for compare subcommand

v5 (only minor changes):
 - removed redundant comment
 - removed dead code (goto after help())
 - set final total_sectors on first assignment

v4:
 - Fixed various typos
 - Added functions for empty sector check and sector-to-bytes offset
 conversion
 - Fixed command-line parameters processing

v3:
 - options -f/-F are orthogonal
 - documentation updated to new syntax and behavior
 - used byte offset instead of sector number for output
 
v2:
 - changed option for second image format to -F
 - changed handling of -f and -F [1]
 - added strict mode (-s)
 - added quiet mode (-q)
 - improved output messages [2]
 - rename variables for larger image handling
 - added man page content

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

Miroslav Rezanina (4):
  block: Add synchronous wrapper for bdrv_co_is_allocated_above
  qemu-img: Add "Quiet mode" option
  qemu-img: Add compare subcommand
  Add qemu-img compare documentation

 block.c               |   51 ++++++-
 blockdev.c            |    6 +-
 include/block/block.h |    5 +-
 qemu-img-cmds.hx      |   34 +++--
 qemu-img.c            |  381 +++++++++++++++++++++++++++++++++++++++++++++----
 qemu-img.texi         |   35 +++++
 6 files changed, 461 insertions(+), 51 deletions(-)