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/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2013, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
#ifndef __LINUX_FLD_H
#define __LINUX_FLD_H
/** \defgroup fld fld
*
* @{
*/
#include "lustre/lustre_idl.h"
#include "../../include/linux/libcfs/libcfs.h"
struct lu_client_fld;
struct lu_server_fld;
struct lu_fld_hash;
struct fld_cache;
extern const struct dt_index_features fld_index_features;
extern const char fld_index_name[];
/*
* FLD (Fid Location Database) interface.
*/
enum {
LUSTRE_CLI_FLD_HASH_DHT = 0,
LUSTRE_CLI_FLD_HASH_RRB
};
struct lu_fld_target {
struct list_head ft_chain;
struct obd_export *ft_exp;
struct lu_server_fld *ft_srv;
__u64 ft_idx;
};
struct lu_server_fld {
/**
* Fld dir proc entry. */
struct proc_dir_entry *lsf_proc_dir;
/**
* /fld file object device */
struct dt_object *lsf_obj;
/**
* super sequence controller export, needed to forward fld
* lookup request. */
struct obd_export *lsf_control_exp;
/**
* Client FLD cache. */
struct fld_cache *lsf_cache;
/**
* Protect index modifications */
struct mutex lsf_lock;
/**
* Fld service name in form "fld-srv-lustre-MDTXXX" */
char lsf_name[LUSTRE_MDT_MAXNAMELEN];
};
struct lu_client_fld {
/**
* Client side proc entry. */
struct proc_dir_entry *lcf_proc_dir;
/**
* List of exports client FLD knows about. */
struct list_head lcf_targets;
/**
* Current hash to be used to chose an export. */
struct lu_fld_hash *lcf_hash;
/**
* Exports count. */
int lcf_count;
/**
* Lock protecting exports list and fld_hash. */
spinlock_t lcf_lock;
/**
* Client FLD cache. */
struct fld_cache *lcf_cache;
/**
* Client fld proc entry name. */
char lcf_name[LUSTRE_MDT_MAXNAMELEN];
int lcf_flags;
};
/* Client methods */
int fld_client_init(struct lu_client_fld *fld,
const char *prefix, int hash);
void fld_client_fini(struct lu_client_fld *fld);
void fld_client_flush(struct lu_client_fld *fld);
int fld_client_lookup(struct lu_client_fld *fld, u64 seq, u32 *mds,
__u32 flags, const struct lu_env *env);
int fld_client_create(struct lu_client_fld *fld,
struct lu_seq_range *range,
const struct lu_env *env);
int fld_client_delete(struct lu_client_fld *fld, u64 seq,
const struct lu_env *env);
int fld_client_add_target(struct lu_client_fld *fld,
struct lu_fld_target *tar);
int fld_client_del_target(struct lu_client_fld *fld,
__u64 idx);
void fld_client_proc_fini(struct lu_client_fld *fld);
/** @} fld */
#endif
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