Re: [Gluster-devel] empty xlator

[Lluís Pàmies i Juárez]

Hi Anand,

Yes I tried both things you mention and they work just fine.

Thanks

On Feb 5, 2014 9:29 PM, "Anand Avati" <address@hidden> wrote:

The nop xlator by itself seems OK. Have you tried the stripe config with the nop xlator on top? or even without the nop xlator?

Avati

On Wed, Feb 5, 2014 at 3:26 PM, Lluís Pàmies i Juárez <address@hidden> wrote:

Hello,

As a proof of concept I'm trying to write a xlator that does nothing, I call it "nop". The code for "nop.c" is simply:

#include "config.h"

#include "call-stub.h"

struct xlator_fops fops = {};

struct xlator_cbks cbks = {};

struct xlator_dumpops dumpops = {};

struct volume_options options[] = {{.key={NULL}},};

int32_t init (xlator_t *this){return 0;}

int fini (xlator_t *this){return 0;}

And I compile it with:

$ gcc -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -DGF_LINUX_HOST_OS -shared -nostartfiles -lglusterfs -lpthread -I${GFS} -I${GFS}/libglusterfs/src -I${GFS}/contrib/uuid nop.c -o nop.so

Then, if I try a test.vol file like that:

volume test-posix

    type storage/posix

    option directory /home/llpamies/Projects/gluster/test-split/node0-data

end-volume

volume test-nop

    type features/nop

    subvolumes test-posix

end-volume

volume test-cache

  type performance/io-cache

  subvolumes test-nop

end-volume

and mount it with:

$ glusterfs --debug -f test.vol /mount/point

It seems to work fine, doing nothing. However, when used together with the stripe xlator as follows:

volume test-posix0

    type storage/posix

    option directory /home/llpamies/Projects/gluster/test-split/node0-data

end-volume

volume test-posix1

    type storage/posix

    option directory /home/llpamies/Projects/gluster/test-split/node1-data

end-volume

volume test-nop0

    type features/nop

    subvolumes test-posix0

end-volume

volume test-nop1

    type features/nop

    subvolumes test-posix1

end-volume

volume test-stripe

    type cluster/stripe

    subvolumes test-nop0 test-nop1

end-volume

Glusterfs hangs during the first fuse lookup for ".Trash", and /mount/point looks unmounted with ???? permissions etc.

Does it look like some bug in the stripe xlator or is there something fundamentally wrong with the nop xlator?

Thank you,

 

--
Lluís

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