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[Qemu-devel] [Bug 1437367] Re: Qemu guest fails to write files with raw


From: Launchpad Bug Tracker
Subject: [Qemu-devel] [Bug 1437367] Re: Qemu guest fails to write files with raw disk (like \\.\PhysicalDrive1) on Windows host.
Date: Tue, 14 Aug 2018 04:17:30 -0000

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1437367

Title:
  Qemu guest fails to write files with raw disk (like
  \\.\PhysicalDrive1) on Windows host.

Status in QEMU:
  Expired

Bug description:
  Qemu guest fails to write files with specifing raw disk like 
\\.\PhysicalDrive1
  full command line is below.
  qemu-sysytem-i386.exe -kernel bzImage -drive file=rootfs.ext2,index=0,if=scsi 
-append root=/dev/sda -drive file=\\.\PhysicalDrive1,index=1,if=scsi

  I found the reason is below aio_worker returns -EIO when flush
  operation.

  https://github.com/qemu/qemu/blob/master/block/raw-win32.c#L95

  static int aio_worker(void *arg)
  ...
      case QEMU_AIO_FLUSH:
          if (!FlushFileBuffers(aiocb->hfile)) {
              return -EIO;
          }

  FlushFileBuffers always fails with GetLastError() == ERROR_INVALID_FUNCTION
  I think this function doesn't support raw device.
  For flushing, you might have to issue scsi/ata command or use another way.
  Trying to just ignoring this error, writing function seems to be fine for me.

  Thanks
  hiroaki

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