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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) 2012, 2013, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/fld/fld_internal.h
*
* Author: Yury Umanets <umka@clusterfs.com>
* Author: Tom WangDi <wangdi@clusterfs.com>
*/
#ifndef __FLD_INTERNAL_H
#define __FLD_INTERNAL_H
#include "../include/lustre/lustre_idl.h"
#include "../include/dt_object.h"
#include "../../include/linux/libcfs/libcfs.h"
#include "../include/lustre_req_layout.h"
#include "../include/lustre_fld.h"
enum {
LUSTRE_FLD_INIT = 1 << 0,
LUSTRE_FLD_RUN = 1 << 1
};
struct fld_stats {
__u64 fst_count;
__u64 fst_cache;
__u64 fst_inflight;
};
typedef int (*fld_hash_func_t) (struct lu_client_fld *, __u64);
typedef struct lu_fld_target *
(*fld_scan_func_t) (struct lu_client_fld *, __u64);
struct lu_fld_hash {
const char *fh_name;
fld_hash_func_t fh_hash_func;
fld_scan_func_t fh_scan_func;
};
struct fld_cache_entry {
struct list_head fce_lru;
struct list_head fce_list;
/**
* fld cache entries are sorted on range->lsr_start field. */
struct lu_seq_range fce_range;
};
struct fld_cache {
/**
* Cache guard, protects fci_hash mostly because others immutable after
* init is finished.
*/
rwlock_t fci_lock;
/**
* Cache shrink threshold */
int fci_threshold;
/**
* Preferred number of cached entries */
int fci_cache_size;
/**
* Current number of cached entries. Protected by \a fci_lock */
int fci_cache_count;
/**
* LRU list fld entries. */
struct list_head fci_lru;
/**
* sorted fld entries. */
struct list_head fci_entries_head;
/**
* Cache statistics. */
struct fld_stats fci_stat;
/**
* Cache name used for debug and messages. */
char fci_name[LUSTRE_MDT_MAXNAMELEN];
unsigned int fci_no_shrink:1;
};
enum fld_op {
FLD_CREATE = 0,
FLD_DELETE = 1,
FLD_LOOKUP = 2
};
enum {
/* 4M of FLD cache will not hurt client a lot. */
FLD_SERVER_CACHE_SIZE = (4 * 0x100000),
/* 1M of FLD cache will not hurt client a lot. */
FLD_CLIENT_CACHE_SIZE = (1 * 0x100000)
};
enum {
/* Cache threshold is 10 percent of size. */
FLD_SERVER_CACHE_THRESHOLD = 10,
/* Cache threshold is 10 percent of size. */
FLD_CLIENT_CACHE_THRESHOLD = 10
};
extern struct lu_fld_hash fld_hash[];
int fld_client_rpc(struct obd_export *exp,
struct lu_seq_range *range, __u32 fld_op);
#if defined (CONFIG_PROC_FS)
extern struct lprocfs_vars fld_client_proc_list[];
#endif
struct fld_cache *fld_cache_init(const char *name,
int cache_size, int cache_threshold);
void fld_cache_fini(struct fld_cache *cache);
void fld_cache_flush(struct fld_cache *cache);
int fld_cache_insert(struct fld_cache *cache,
const struct lu_seq_range *range);
struct fld_cache_entry
*fld_cache_entry_create(const struct lu_seq_range *range);
int fld_cache_insert_nolock(struct fld_cache *cache,
struct fld_cache_entry *f_new);
void fld_cache_delete(struct fld_cache *cache,
const struct lu_seq_range *range);
void fld_cache_delete_nolock(struct fld_cache *cache,
const struct lu_seq_range *range);
int fld_cache_lookup(struct fld_cache *cache,
const u64 seq, struct lu_seq_range *range);
struct fld_cache_entry*
fld_cache_entry_lookup(struct fld_cache *cache, struct lu_seq_range *range);
void fld_cache_entry_delete(struct fld_cache *cache,
struct fld_cache_entry *node);
void fld_dump_cache_entries(struct fld_cache *cache);
struct fld_cache_entry
*fld_cache_entry_lookup_nolock(struct fld_cache *cache,
struct lu_seq_range *range);
int fld_write_range(const struct lu_env *env, struct dt_object *dt,
const struct lu_seq_range *range, struct thandle *th);
static inline const char *
fld_target_name(struct lu_fld_target *tar)
{
if (tar->ft_srv != NULL)
return tar->ft_srv->lsf_name;
return (const char *)tar->ft_exp->exp_obd->obd_name;
}
#endif /* __FLD_INTERNAL_H */
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