[libvirt-users] Problem with the use of domfsfreeze mountpoint option

[Shanzhi Yu]

----- Original Message -----

| From: "Eric Blake" <eblake at redhat.com>
| To: "Payes Anand" <payes.anand at cloudbyte.com>, libvirt-users at redhat.com
| Sent: Wednesday, November 12, 2014 5:51:12 AM
| Subject: Re: [libvirt-users] Problem with the use of domfsfreeze mountpoint
| option

| On 11/11/2014 01:58 PM, Payes Anand wrote:
| > Hi everybody,
| >
| > I am having a problem with the use of domfsfreeze command.
| >
| > It is freezing all the filesystems present on the domain,
| >
| > instead of freezing just the mountpoints provided.
| >
| > I am issuing the command--
| >
| > # virsh domfsfreeze <domain> --mountpoint <mountpoint>
| >
| > Output was-- Froze 3 filesystem(s)
| >
| >
| > I want to freeze a particular mount point on the VM, so that i can
| > take a snapshot using my own snapshot feature.
| >
| > Using library: libvirt 1.2.5
| > Using API: QEMU 1.2.5
| > Running hypervisor: QEMU 2.0.0

| What version of qemu-guest-agent is running in the guest?
| qemu-guest-agent doesn't support per-mountpoint freezing until the
| introduction of guest-fsfreeze-freeze-list in qemu 2.2 (still unreleased).

| >
| > --Upgraded libvirt to 1.2.10, but that also didn't solve the problem.
| >
| > Am i missing something over here?
| > Any help would be greatly appreciated.

| I wonder if you may have uncovered a libvirt bug. If the guest agent is
| not capable of supporting per-mount freezing (because the agent is too
| old), the command should fail rather than blindly freezing everything.
| But to know for sure, it would be good to find the log messages for the
| actual agent commands issued by libvirt, to make sure we were actually
| trying to freeze just a single mount point.

On RHEL, the bug for adding FSFreeze function is this one : https://bugzilla.redhat.com/show_bug.cgi?id=1102457 
And according commnet 10 in that bug, --mountpoint is not supported now. 
Whether you specify --mountpoing or not, it will always output 

Froze 2 filesystem(s) or Thawed 2 filesystem(s) 

| --
| Eric Blake eblake redhat com +1-919-301-3266
| Libvirt virtualization library http://libvirt.org

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-- 
Regards 
shyu 
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