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qemu

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  1. 11 6月, 2018 1 次提交
  3. 20 5月, 2018 3 次提交
  5. 26 9月, 2017 1 次提交
  7. 08 8月, 2017 1 次提交
  9. 18 7月, 2017 1 次提交
    • J
      qemu-img: Check for backing image if specified during create · 6e6e55f5
      由 John Snow 提交于 
      Or, rather, force the open of a backing image if one was specified
for creation. Using a similar -unsafe option as rebase, allow qemu-img
to ignore the backing file validation if possible.

It may not always be possible, as in the existing case when a filesize
for the new image was not specified.

This is accomplished by shifting around the conditionals in
bdrv_img_create, such that a backing file is always opened unless we
provide BDRV_O_NO_BACKING. qemu-img is adjusted to pass this new flag
when -u is provided to create.

Sorry for the heinous looking diffstat, but it's mostly whitespace.

Inspired by: https://bugzilla.redhat.com/show_bug.cgi?id=1213786Signed-off-by: NJohn Snow <jsnow@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      6e6e55f5
  11. 11 7月, 2017 1 次提交
  13. 29 5月, 2017 2 次提交
  15. 11 5月, 2017 1 次提交
  17. 27 4月, 2017 1 次提交
  19. 07 4月, 2017 1 次提交
  21. 01 3月, 2017 1 次提交
    • P
      qemu-img: make convert async · 2d9187bc
      由 Peter Lieven 提交于 
      the convert process is currently completely implemented with sync operations.
That means it reads one buffer and then writes it. No parallelism and each sync
request takes as long as it takes until it is completed.

This can be a big performance hit when the convert process reads and writes
to devices which do not benefit from kernel readahead or pagecache.
In our environment we heavily have the following two use cases when using
qemu-img convert.

a) reading from NFS and writing to iSCSI for deploying templates
b) reading from iSCSI and writing to NFS for backups

In both processes we use libiscsi and libnfs so we have no kernel cache.

This patch changes the convert process to work with parallel running coroutines
which can significantly improve performance for network storage devices:

qemu-img (master)
 nfs -> iscsi 22.8 secs
 nfs -> ram   11.7 secs
 ram -> iscsi 12.3 secs

qemu-img-async (8 coroutines, in-order write disabled)
 nfs -> iscsi 11.0 secs
 nfs -> ram   10.4 secs
 ram -> iscsi  9.0 secs

This patches introduces 2 new cmdline parameters. The -m parameter to specify
the number of coroutines running in parallel (defaults to 8). And the -W parameter to
allow qemu-img to write to the target out of order rather than sequential. This improves
performance as the writes do not have to wait for each other to complete.
Signed-off-by: NPeter Lieven <pl@kamp.de>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      2d9187bc
  23. 21 9月, 2016 2 次提交
  25. 08 6月, 2016 5 次提交
  27. 22 2月, 2016 2 次提交
  29. 03 11月, 2014 4 次提交
  31. 22 8月, 2014 2 次提交
  33. 04 12月, 2013 1 次提交
  35. 12 9月, 2013 1 次提交
  37. 06 9月, 2013 2 次提交
  39. 23 2月, 2013 3 次提交
  41. 24 10月, 2012 1 次提交
  43. 12 9月, 2012 1 次提交
    • B
      qemu-img: Add json output option to the info command. · c054b3fd
      由 Benoît Canet 提交于 
      This option --output=[human|json] make qemu-img info output on
human or JSON representation at the choice of the user.

example:
{
    "snapshots": [
        {
            "vm-clock-nsec": 637102488,
            "name": "vm-20120821145509",
            "date-sec": 1345553709,
            "date-nsec": 220289000,
            "vm-clock-sec": 20,
            "id": "1",
            "vm-state-size": 96522745
        },
        {
            "vm-clock-nsec": 28210866,
            "name": "vm-20120821154059",
            "date-sec": 1345556459,
            "date-nsec": 171392000,
            "vm-clock-sec": 46,
            "id": "2",
            "vm-state-size": 101208714
        }
    ],
    "virtual-size": 1073741824,
    "filename": "snap.qcow2",
    "cluster-size": 65536,
    "format": "qcow2",
    "actual-size": 985587712,
    "dirty-flag": false
}
Signed-off-by: NBenoit Canet <benoit@irqsave.net>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      c054b3fd
  45. 15 6月, 2012 1 次提交
    • K
      qemu-img check -r for repairing images · 4534ff54
      由 Kevin Wolf 提交于 
      The QED block driver already provides the functionality to not only
detect inconsistencies in images, but also fix them. However, this
functionality cannot be manually invoked with qemu-img, but the
check happens only automatically during bdrv_open().

This adds a -r switch to qemu-img check that allows manual invocation
of an image repair.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      4534ff54
  47. 15 12月, 2011 1 次提交