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block: add -drive copy-on-read=on|off

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This patch adds the -drive copy-on-read=on|off command-line option:

  copy-on-read=on|off
  copy-on-read is "on" or "off" and enables whether to copy read backing
  file sectors into the image file.  Copy-on-read avoids accessing the
  same backing file sectors repeatedly and is useful when the backing
  file is over a slow network.  By default copy-on-read is off.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2011-11-17 13:40:32 +00:00 • committed by Kevin Wolf
parent ab1859218a
commit fb0490f69f
4 changed files with 21 additions and 3 deletions
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4
qemu-config.c
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@ -109,6 +109,10 @@ static QemuOptsList qemu_drive_opts = {
.name = "bps_wr",
.type = QEMU_OPT_NUMBER,
.help = "limit write bytes per second",
},{
.name = "copy-on-read",
.type = QEMU_OPT_BOOL,
.help = "copy read data from backing file into image file",
},
{ /* end of list */ }
},