Re: support for hole punching in glusterfs

[Joe Julian <joe@xxxxxxxxxxxxxxxx>]

I would certainly be willing to help test this. I would even suggest a step further where a volume option would automatically poke the hole if a write created a null block.

On 01/22/16 08:58, Niels de Vos wrote:

On Fri, Jan 22, 2016 at 04:07:54PM +0000, Ankireddypalle Reddy wrote:

Hi,
          Thanks for checking this. If this is not supported through FUSE can this be done through libgfapi.

Not yet. I was thinking of adding support for this after
SEEK_HOLE/SEEK_DATA has been merged. Maybe we can include hole punching
in gfapi for 3.8, where FUSE follows later. Would you be willing to
assist with the development or testing of that?

Thanks,
Niels

Thanks and Regards,
Ram

-----Original Message-----
From: Niels de Vos [mailto:ndevos@xxxxxxxxxx] 
Sent: Friday, January 22, 2016 11:05 AM
To: Ankireddypalle Reddy
Cc: gluster-users@xxxxxxxxxxx
Subject: Re:  support for hole punching in glusterfs

On Fri, Jan 22, 2016 at 03:05:16PM +0000, Ankireddypalle Reddy wrote:

Hi,
        Hole punching through fallocate succeeds for a ext4 mount path. But it fails for a glusterfs mount path. The volume is a disperse volume.

        fallocate(fd,FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE,0,sizeof(array)) fails with a return code of EOPNOTSUPP.

       The ext4 file system mount arguments are "rw,noexec,nosuid,nodev,user_xattr,discard".

This is currently not supported yet. I'm not sure if the FUSE kernel module support punching holes yet, either. Please file a bug for this feature so that we can figure out a plan to work on it.

  https://bugzilla.redhat.com/enter_bug.cgi?product=GlusterFS&component=fuse

Note that support for SEEK_HOLE and SEEK_DATA is also not availeble yet.
Some work has been done, but it is not ready for inclusion at this moment. Hopefully it lands in the upcoming 3.8 release.

  https://bugzilla.redhat.com/show_bug.cgi?id=1220173

Thanks,
Niels



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