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/*
Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef _NFS_FH_H_
#define _NFS_FH_H_
#include "xlator.h"
#include "xdr-nfs3.h"
#include "iatt.h"
#include <sys/types.h>
#include "compat-uuid.h"
/* BIG FAT WARNING: The file handle code is tightly coupled to NFSv3 file
* handles for now. This will change if and when we need v4. */
#define GF_NFSFH_IDENT0 ':'
#define GF_NFSFH_IDENT1 'O'
#define GF_NFSFH_IDENT2 'G'
#define GF_NFSFH_IDENT3 'L'
#define GF_NFSFH_IDENT_SIZE (sizeof(char) * 4)
#define GF_NFSFH_STATIC_SIZE (GF_NFSFH_IDENT_SIZE + (3*sizeof (uuid_t)))
#define nfs3_fh_exportid_to_index(exprtid) ((uint16_t)exprtid[15])
/* ATTENTION: Change in size of the structure below should be reflected in the
* GF_NFSFH_STATIC_SIZE.
*/
struct nfs3_fh {
/* Used to ensure that a bunch of bytes are actually a GlusterFS NFS
* file handle. Should contain ":OGL"
*/
char ident[4];
/* UUID that identifies an export. The value stored in exportid
* depends on the usage of gluster nfs. If the DVM is enabled using
* the nfs.dynamic-volumes option then exportid will contain the UUID
* of the volume so that gnfs is able to identify volumes uniquely
* through volume additions,deletions,migrations, etc.
*
* When not using dvm, exportid contains the index of the volume
* based on the position of the volume in the list of subvolumes
* for gnfs.
*/
uuid_t exportid;
/* File/dir gfid. */
uuid_t gfid;
uuid_t mountid;
/* This structure must be exactly NFS3_FHSIZE (64) bytes long.
Having the structure shorter results in buffer overflows
during XDR decoding.
*/
unsigned char padding[NFS3_FHSIZE - GF_NFSFH_STATIC_SIZE];
} __attribute__((__packed__));
#define GF_NFS3FH_STATIC_INITIALIZER {{0},}
extern uint32_t
nfs3_fh_compute_size ();
extern uint16_t
nfs3_fh_hash_entry (uuid_t gfid);
extern int
nfs3_fh_validate (struct nfs3_fh *fh);
extern struct nfs3_fh
nfs3_fh_build_indexed_root_fh (xlator_list_t *cl, xlator_t *xl);
extern int
nfs3_fh_is_root_fh (struct nfs3_fh *fh);
extern int
nfs3_fh_build_child_fh (struct nfs3_fh *parent, struct iatt *newstat,
struct nfs3_fh *newfh);
extern void
nfs3_log_fh (struct nfs3_fh *fh);
extern void
nfs3_fh_to_str (struct nfs3_fh *fh, char *str, size_t len);
extern int
nfs3_fh_build_parent_fh (struct nfs3_fh *child, struct iatt *newstat,
struct nfs3_fh *newfh);
extern struct nfs3_fh
nfs3_fh_build_uuid_root_fh (uuid_t volumeid, uuid_t mountid);
extern int
nfs3_build_fh (inode_t *inode, uuid_t exportid,
struct nfs3_fh *newfh);
#endif
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