[Gluster-users] support for hole punching in glusterfs

[Joe Julian]

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 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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