drivers/staging/lustre/lustre/include/lustre_fld.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #ifndef __LINUX_FLD_H
  34 #define __LINUX_FLD_H
  35
  36 /** \defgroup fld fld
  37  *
  38  * @{
  39  */
  40
  41 #include "lustre/lustre_idl.h"
  42 #include "../../include/linux/libcfs/libcfs.h"
  43
  44 struct lu_client_fld;
  45 struct lu_server_fld;
  46 struct lu_fld_hash;
  47 struct fld_cache;
  48
  49 extern const struct dt_index_features fld_index_features;
  50 extern const char fld_index_name[];
  51
  52 /*
  53  * FLD (Fid Location Database) interface.
  54  */
  55 enum {
  56         LUSTRE_CLI_FLD_HASH_DHT = 0,
  57         LUSTRE_CLI_FLD_HASH_RRB
  58 };
  59
  60 struct lu_fld_target {
  61         struct list_head               ft_chain;
  62         struct obd_export       *ft_exp;
  63         struct lu_server_fld    *ft_srv;
  64         __u64               ft_idx;
  65 };
  66
  67 struct lu_server_fld {
  68         /**
  69          * super sequence controller export, needed to forward fld
  70          * lookup  request.
  71          */
  72         struct obd_export       *lsf_control_exp;
  73
  74         /** Client FLD cache. */
  75         struct fld_cache        *lsf_cache;
  76
  77         /** Protect index modifications */
  78         struct mutex            lsf_lock;
  79
  80         /** Fld service name in form "fld-srv-lustre-MDTXXX" */
  81         char                 lsf_name[LUSTRE_MDT_MAXNAMELEN];
  82
  83 };
  84
  85 struct lu_client_fld {
  86         /** Client side debugfs entry. */
  87         struct dentry           *lcf_debugfs_entry;
  88
  89         /** List of exports client FLD knows about. */
  90         struct list_head               lcf_targets;
  91
  92         /** Current hash to be used to chose an export. */
  93         struct lu_fld_hash      *lcf_hash;
  94
  95         /** Exports count. */
  96         int                   lcf_count;
  97
  98         /** Lock protecting exports list and fld_hash. */
  99         spinlock_t               lcf_lock;
 100
 101         /** Client FLD cache. */
 102         struct fld_cache        *lcf_cache;
 103
 104         /** Client fld debugfs entry name. */
 105         char                     lcf_name[LUSTRE_MDT_MAXNAMELEN];
 106 };
 107
 108 /* Client methods */
 109 int fld_client_init(struct lu_client_fld *fld,
 110                     const char *prefix, int hash);
 111
 112 void fld_client_fini(struct lu_client_fld *fld);
 113
 114 void fld_client_flush(struct lu_client_fld *fld);
 115
 116 int fld_client_lookup(struct lu_client_fld *fld, u64 seq, u32 *mds,
 117                       __u32 flags, const struct lu_env *env);
 118
 119 int fld_client_create(struct lu_client_fld *fld,
 120                       struct lu_seq_range *range,
 121                       const struct lu_env *env);
 122
 123 int fld_client_delete(struct lu_client_fld *fld, u64 seq,
 124                       const struct lu_env *env);
 125
 126 int fld_client_add_target(struct lu_client_fld *fld,
 127                           struct lu_fld_target *tar);
 128
 129 int fld_client_del_target(struct lu_client_fld *fld,
 130                           __u64 idx);
 131
 132 void fld_client_debugfs_fini(struct lu_client_fld *fld);
 133
 134 /** @} fld */
 135
 136 #endif