[Gluster-users] support for hole punching in glusterfs

[Ankireddypalle Reddy]

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

Thanks and Regards,
Ram

-----Original Message-----
From: Niels de Vos [mailto:ndevos at redhat.com] 
Sent: Friday, January 22, 2016 11:05 AM
To: Ankireddypalle Reddy
Cc: gluster-users at gluster.org
Subject: Re: [Gluster-users] 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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