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xen-devel
Re: [Xen-devel] [PATCH] qemu-xen-3.4-testing: Fix read-only image file h
Oh, one more thing I've discovered now. Since the codebase for
qemu-xen-unstable is looking the same like for qemu-xen-3.4-testing and
the patch is applicable without any modifications it could be working
for xen-4.1 unstable as well, unfortunately I was not able to boot PVOPS
kernel since it always ends up in kernel panic, maybe the missing
drivers or something like that. Could anybody please test my patch with
qemu-xen-unstable to see if it's working?
Thanks a lot!
Michal
On 06/03/2010 04:12 PM, Michal Novotny wrote:
Oh, just one more thing that should be mentioned:
When you want to mount an image that is set as read-only in the domain
configuration file but you omit to set mode to read-only it results
into I/O errors when processing the requests. Remounting as read-only
or unmounting and remounting using the `mount /dev/* /path/to/mount -o
ro` shall do the mounting the correct way, i.e. with no I/O errors, so
make sure you mount those disks as read-only otherwise you can be
getting errors like:
end_request: I/O error, dev hdb, sector 52
Buffer I/O error on device hdb1, logical block 1
lost page write due to I/O error on hdb1
and for IDE devices you'll be getting several additional DeviceFault
errors since mounting the device read-write (default setting) writes
some data onto a disk at the mount-time.
Michal
On 06/03/2010 04:04 PM, Michal Novotny wrote:
[Well, I did send an e-mail to the list using git but it's not here
so I'm forwarding the e-mail to the list for sure:]
Hi,
this is the patch for qemu-xen-3.4-testing to fix the read-only
image file handling since the image file was always treated as
read-write which means that all the HVM guests were able to
write to all the disk images available in domain configuration
file no matter what the mode of the image was defined. This
patch fixes this functionality to honor the O_RDONLY in the
BDRV_O_ACCESS flag in block.c and also fixes the IDE and SCSI
interfaces that uses it.
It's been tested on RHEL-5 with xen-3.4-testing version of
upstream xen with xen-3.4-testing qemu implementation.
For SCSI devices the DATA PROTECT request sense has been added
as found at: http://en.wikipedia.org/wiki/SCSI_Request_Sense_Command
file no matter what the mode of the image was defined. This
patch fixes this functionality to honor the O_RDONLY in the
BDRV_O_ACCESS flag in block.c and also fixes the IDE and SCSI
interfaces that uses it.
It's been tested on RHEL-5 with xen-3.4-testing version of
Michal
Signed-off-by: Michal Novotny <minovotn@xxxxxxxxxx>
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--
Michal Novotny<minovotn@xxxxxxxxxx>, RHCE
Virtualization Team (xen userspace), Red Hat
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