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[Qemu-devel] [Bug 658610] Re: Check whether images have write permission

From: Anthony Liguori
Subject: [Qemu-devel] [Bug 658610] Re: Check whether images have write permissions
Date: Thu, 24 Mar 2011 03:19:29 -0000

This is a legacy behavior in QEMU.  There are a number of legitimate use
cases where a user may only have read access to an image and as long as
that image is mounted read-only, everything will work okay.

Virtio and SCSI will expose the read-only attribute to the guest so it
should be very obvious what's happening.  Unfortunately, IDE does not
support the concept of read-only.

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  Check whether images have write permissions

Status in QEMU:
Status in “qemu-kvm” package in Ubuntu:

Bug description:
  KVM/Qemu should check whether the disk images have write permissions
  in order to prevent users from getting weird IO errors in their VMs
  without understanding what's happening.

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