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Bug 1166476 - fail to specify the cache mode for qemu-img to bypass the host cache (amend)
Summary: fail to specify the cache mode for qemu-img to bypass the host cache (amend)
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.1
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: ---
Assignee: Ademar Reis
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-11-21 04:42 UTC by Sibiao Luo
Modified: 2014-11-28 02:54 UTC (History)
12 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-11-24 09:05:22 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Sibiao Luo 2014-11-21 04:42:01 UTC 
Description of problem:
From qemu-kvm-1.5.3-35.el7, qemu-img adds the "amend" subcommand option which allows changing image options on existing image files(BZ#1033490). But fail to specify the cache mode for 'qemu-img amend' to bypass the host cache with "amend: invalid option -- 'T'" error.

Version-Release number of selected component (if applicable):
host info:
# uname -r && rpm -q qemu-kvm
3.10.0-205.el7.x86_64
qemu-kvm-1.5.3-79.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.qemu-img amend -f qcow2 -o compat=0.10 image-1.qcow2 -T none
amend: invalid option -- 'T'
qemu-img version 1.5.3, Copyright (c) 2004-2008 Fabrice Bellard
usage: qemu-img command [command options]
QEMU disk image utility

Command syntax:
  check [-q] [-f fmt] [--output=ofmt] [-r [leaks | all]] [-T src_cache] filename
  create [-q] [-f fmt] [-o options] filename [size]
  commit [-q] [-f fmt] [-t cache] filename
  compare [-f fmt] [-F fmt] [-T src_cache] [-p] [-q] [-s] filename1 filename2
  convert [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-T src_cache] [-O output_fmt] [-o options] [-s snapshot_name] [-S sparse_size] filename [filename2 [...]] output_filename
  info [-f fmt] [--output=ofmt] [--backing-chain] filename
  map [-f fmt] [--output=ofmt] filename
  snapshot [-q] [-l | -a snapshot | -c snapshot | -d snapshot] filename
  rebase [-q] [-f fmt] [-t cache] [-T src_cache] [-p] [-u] -b backing_file [-F backing_fmt] filename
  resize [-q] filename [+ | -]size
  amend [-q] [-f fmt] [-t cache] -o options filename
......

Actual results:

Expected results:
It should just like qemu-img check/compare/convert/rebase which support specifying the cache mode.

Additional info:
Comment 1 Hanna Czenczek 2014-11-24 09:05:22 UTC 
Hi Sluo,

This is because qemu-img amend modifies the given image. Therefore, it is a destination rather than a source, which means you have to use "-t" to specify the desired caching mode.

Max
Comment 2 Sibiao Luo 2014-11-28 02:54:48 UTC 
(In reply to Max Reitz from comment #1)
> Hi Sluo,
> 
> This is because qemu-img amend modifies the given image. Therefore, it is a
> destination rather than a source, which means you have to use "-t" to
> specify the desired caching mode.
> 
Ok, thanks for your kindly reminds.
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