[Qemu-devel] [Bug 1351271] Re: qemu deletes the backing file in snapshot mode

[Giancarlo Formicuccia]

Just tested qemu 2.1.0 and the bug is fixed in this version.


** Changed in: qemu
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1351271

Title:
  qemu deletes the backing file in snapshot mode

Status in QEMU:
  Fix Released

Bug description:
  The file removal occurs during the "change" operation. It happens only
  in snapshot mode.

  Minimal steps to reproduce the problem:

  $ dd if=/dev/zero of=file.img bs=1M count=1
  1+0 records in
  1+0 records out
  1048576 bytes (1.0 MB) copied, 0.00288727 s, 363 MB/s
  $ ls file.img
  file.img
  $ qemu-system-x86_64 -monitor stdio -snapshot
  QEMU 2.0.0 monitor - type 'help' for more information                         
                                                                                
                                  
  (qemu) change ide1-cd0 file.img
  (qemu) change ide1-cd0 file.img
  (qemu) change ide1-cd0 file.img
  Could not open 'file.img': No such file or directory                          
                                                                                
                                  
  (qemu) q
  $ ls file.img
  ls: cannot access file.img: No such file or directory

  qemu version is 2.0.0 from arch linux, which is the vanilla version
  plus one patch unrelated to this problem.

  info block in snapshot mode reports:
  ide1-cd0: /var/tmp/vl.G5WENk (qcow2)
      Removable device: not locked, tray closed
      Backing file:     file.img (chain depth: 1)

  whereas info block NOT in snapshot mode correctly reports:
  ide1-cd0: file.img (raw, read-only)
      Removable device: not locked, tray closed

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