[Gluster-devel] empty xlator

[Anand Avati]

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
<llpamies at pamies.cat>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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>
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