drivers/staging/lustre/lustre/lmv/lmv_internal.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) 2004, 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 _LMV_INTERNAL_H_
  34 #define _LMV_INTERNAL_H_
  35
  36 #include <uapi/linux/lustre/lustre_idl.h>
  37 #include <obd.h>
  38 #include <lustre_lmv.h>
  39
  40 #define LMV_MAX_TGT_COUNT 128
  41
  42 #define LL_IT2STR(it)                                   \
  43         ((it) ? ldlm_it2str((it)->it_op) : "0")
  44
  45 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
  46                     struct lookup_intent *it, struct ptlrpc_request **reqp,
  47                     ldlm_blocking_callback cb_blocking,
  48                     __u64 extra_lock_flags);
  49
  50 int lmv_fld_lookup(struct lmv_obd *lmv, const struct lu_fid *fid, u32 *mds);
  51 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid, u32 mds);
  52 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
  53                   struct lu_fid *fid, struct md_op_data *op_data);
  54
  55 int lmv_revalidate_slaves(struct obd_export *exp,
  56                           const struct lmv_stripe_md *lsm,
  57                           ldlm_blocking_callback cb_blocking,
  58                           int extra_lock_flags);
  59
  60 static inline struct obd_device *lmv2obd_dev(struct lmv_obd *lmv)
  61 {
  62         return container_of0(lmv, struct obd_device, u.lmv);
  63 }
  64
  65 static inline struct lmv_tgt_desc *
  66 lmv_get_target(struct lmv_obd *lmv, u32 mdt_idx, int *index)
  67 {
  68         int i;
  69
  70         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
  71                 if (!lmv->tgts[i])
  72                         continue;
  73
  74                 if (lmv->tgts[i]->ltd_idx == mdt_idx) {
  75                         if (index)
  76                                 *index = i;
  77                         return lmv->tgts[i];
  78                 }
  79         }
  80
  81         return ERR_PTR(-ENODEV);
  82 }
  83
  84 static inline int
  85 lmv_find_target_index(struct lmv_obd *lmv, const struct lu_fid *fid)
  86 {
  87         struct lmv_tgt_desc *ltd;
  88         u32 mdt_idx = 0;
  89         int index = 0;
  90
  91         if (lmv->desc.ld_tgt_count > 1) {
  92                 int rc;
  93
  94                 rc = lmv_fld_lookup(lmv, fid, &mdt_idx);
  95                 if (rc < 0)
  96                         return rc;
  97         }
  98
  99         ltd = lmv_get_target(lmv, mdt_idx, &index);
 100         if (IS_ERR(ltd))
 101                 return PTR_ERR(ltd);
 102
 103         return index;
 104 }
 105
 106 static inline struct lmv_tgt_desc *
 107 lmv_find_target(struct lmv_obd *lmv, const struct lu_fid *fid)
 108 {
 109         int index;
 110
 111         index = lmv_find_target_index(lmv, fid);
 112         if (index < 0)
 113                 return ERR_PTR(index);
 114
 115         return lmv->tgts[index];
 116 }
 117
 118 static inline int lmv_stripe_md_size(int stripe_count)
 119 {
 120         struct lmv_stripe_md *lsm;
 121
 122         return sizeof(*lsm) + stripe_count * sizeof(lsm->lsm_md_oinfo[0]);
 123 }
 124
 125 int lmv_name_to_stripe_index(enum lmv_hash_type hashtype,
 126                              unsigned int max_mdt_index,
 127                              const char *name, int namelen);
 128
 129 static inline const struct lmv_oinfo *
 130 lsm_name_to_stripe_info(const struct lmv_stripe_md *lsm, const char *name,
 131                         int namelen)
 132 {
 133         int stripe_index;
 134
 135         stripe_index = lmv_name_to_stripe_index(lsm->lsm_md_hash_type,
 136                                                 lsm->lsm_md_stripe_count,
 137                                                 name, namelen);
 138         if (stripe_index < 0)
 139                 return ERR_PTR(stripe_index);
 140
 141         LASSERTF(stripe_index < lsm->lsm_md_stripe_count,
 142                  "stripe_index = %d, stripe_count = %d hash_type = %x name = %.*s\n",
 143                  stripe_index, lsm->lsm_md_stripe_count,
 144                  lsm->lsm_md_hash_type, namelen, name);
 145
 146         return &lsm->lsm_md_oinfo[stripe_index];
 147 }
 148
 149 static inline bool lmv_need_try_all_stripes(const struct lmv_stripe_md *lsm)
 150 {
 151         return !lmv_is_known_hash_type(lsm->lsm_md_hash_type) ||
 152                lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION;
 153 }
 154
 155 struct lmv_tgt_desc
 156 *lmv_locate_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
 157                 struct lu_fid *fid);
 158 /* lproc_lmv.c */
 159 void lprocfs_lmv_init_vars(struct lprocfs_static_vars *lvars);
 160
 161 extern const struct file_operations lmv_proc_target_fops;
 162
 163 #endif