Neils,
Thanks for pointing to the sample code. The use case is to use
GFID as a unique key for maintaining indexing information about a file when it
is being backed up from GlusterFS storage. Extending GFAPI to extract GFID for
a file would be great.
As per the example If I need to find GFID for a path p1/p2/p3/p4
on a glusterfs volume then should I do a look up for every level?
LOOKUP (/)->LOOKUP(p1)-> LOOKUP(p2)-> LOOKUP(p3)-> LOOKUP(p4)
Thanks and Regards,
Ram
-----Original Message-----
From: Niels de Vos [mailto:[email protected]]
Sent: Monday, January 09, 2017 3:39 PM
To: Ankireddypalle Reddy
Cc: Gluster Devel ([email protected]); [email protected]
Subject: Re: [Gluster-devel] Get GFID for a file through libgfapi
On Mon, Jan 09, 2017 at 05:53:03PM +0000, Ankireddypalle Reddy wrote:
> Hi,
> I am trying to extract the GFID for a file through libgfapi
> interface. When I try to extract the value of extended attribute
> glusterfs.gfid through libgfapi I get the errorno: 95. This works for FUSE
> though. Is there a way to extract the GFID for a file through libgfapi.
It seems that this is a case where FUSE handles the xatts special. The
glusterfs.gfid and glusterfs.gfid.string (VIRTUAL_GFID_XATTR_KEY and
VIRTUAL_GFID_XATTR_KEY_STR) are specifically handled in
xlators/mount/fuse/src/fuse-bridge.c.
There is a way to get the GFID, but it probably is rather a cumbersome
workaround for you. The handle-API is used heavily by NFS-Ganesha (because NFS
uses filehandles more than filenames), and extracts the GFID from the 'struct
glfs_object' with glfs_h_extract_handle(). A basic example of how to obtain and
extract the handle is in
https://github.com/gluster/glusterfs/blob/master/tests/basic/gfapi/bug1291259.c
Could you explain the need for knowing the GFID in the application? We can
extend gfapi with fetching the GFID if that would help you.
Niels
PS: we have a new [email protected] where external projects can ask gfapi
related questions. The gluster-devel list tends to be a little heavy on traffic
for non-Gluster developers.
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