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qemu-img: Add --start-offset and --max-length to map

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The mapping operation of large disks especially ones stored over a
long chain of QCOW2 files can take a long time to finish.
Additionally when mapping fails there was no way recover by
restarting the mapping from the failed location.

The new options, --start-offset and --max-length allows the user to
divide these type of map operations into shorter independent tasks.

Reviewed-by: Eric Blake <eblake@redhat.com>
Acked-by: Mark Kanda <mark.kanda@oracle.com>
Co-developed-by: Yoav Elnekave <yoav.elnekave@oracle.com>
Signed-off-by: Yoav Elnekave <yoav.elnekave@oracle.com>
Signed-off-by: Eyal Moscovici <eyal.moscovici@oracle.com>
Message-Id: <20200513133629.18508-5-eyal.moscovici@oracle.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eyal Moscovici 2020-05-13 16:36:29 +03:00 • committed by Eric Blake
parent e46c0b18cf
commit c0469496b3
3 changed files with 24 additions and 4 deletions
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4
qemu-img-cmds.hx
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@ -63,9 +63,9 @@ SRST
ERST
DEF("map", img_map,
"map [--object objectdef] [--image-opts] [-f fmt] [--output=ofmt] [-U] filename")
"map [--object objectdef] [--image-opts] [-f fmt] [--start-offset=offset] [--max-length=len] [--output=ofmt] [-U] filename")
SRST
.. option:: map [--object OBJECTDEF] [--image-opts] [-f FMT] [--output=OFMT] [-U] FILENAME
.. option:: map [--object OBJECTDEF] [--image-opts] [-f FMT] [--start-offset=OFFSET] [--max-length=LEN] [--output=OFMT] [-U] FILENAME
ERST
DEF("measure", img_measure,