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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef _LMV_INTERNAL_H_
  38 #define _LMV_INTERNAL_H_
  39
  40 #include "../include/lustre/lustre_idl.h"
  41 #include "../include/obd.h"
  42
  43 #define LMV_MAX_TGT_COUNT 128
  44
  45 #define lmv_init_lock(lmv)   mutex_lock(&lmv->init_mutex);
  46 #define lmv_init_unlock(lmv) mutex_unlock(&lmv->init_mutex);
  47
  48 #define LL_IT2STR(it)                                   \
  49         ((it) ? ldlm_it2str((it)->it_op) : "0")
  50
  51 int lmv_check_connect(struct obd_device *obd);
  52
  53 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
  54                     void *lmm, int lmmsize, struct lookup_intent *it,
  55                     int flags, struct ptlrpc_request **reqp,
  56                     ldlm_blocking_callback cb_blocking,
  57                     __u64 extra_lock_flags);
  58
  59 int lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
  60                       void *lmm, int lmmsize, struct lookup_intent *it,
  61                       int flags, struct ptlrpc_request **reqp,
  62                       ldlm_blocking_callback cb_blocking,
  63                       __u64 extra_lock_flags);
  64
  65 int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
  66                     void *lmm, int lmmsize, struct lookup_intent *it,
  67                     int flags, struct ptlrpc_request **reqp,
  68                     ldlm_blocking_callback cb_blocking,
  69                     __u64 extra_lock_flags);
  70
  71 int lmv_blocking_ast(struct ldlm_lock *, struct ldlm_lock_desc *,
  72                      void *, int);
  73 int lmv_fld_lookup(struct lmv_obd *lmv, const struct lu_fid *fid, u32 *mds);
  74 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid, u32 mds);
  75 int lmv_fid_alloc(struct obd_export *exp, struct lu_fid *fid,
  76                   struct md_op_data *op_data);
  77
  78 static inline struct lmv_stripe_md *lmv_get_mea(struct ptlrpc_request *req)
  79 {
  80         struct mdt_body  *body;
  81         struct lmv_stripe_md    *mea;
  82
  83         LASSERT(req != NULL);
  84
  85         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
  86
  87         if (!body || !S_ISDIR(body->mode) || !body->eadatasize)
  88                 return NULL;
  89
  90         mea = req_capsule_server_sized_get(&req->rq_pill, &RMF_MDT_MD,
  91                                            body->eadatasize);
  92         LASSERT(mea != NULL);
  93
  94         if (mea->mea_count == 0)
  95                 return NULL;
  96         if( mea->mea_magic != MEA_MAGIC_LAST_CHAR &&
  97                 mea->mea_magic != MEA_MAGIC_ALL_CHARS &&
  98                 mea->mea_magic != MEA_MAGIC_HASH_SEGMENT)
  99                 return NULL;
 100
 101         return mea;
 102 }
 103
 104 static inline int lmv_get_easize(struct lmv_obd *lmv)
 105 {
 106         return sizeof(struct lmv_stripe_md) +
 107                 lmv->desc.ld_tgt_count *
 108                 sizeof(struct lu_fid);
 109 }
 110
 111 static inline struct lmv_tgt_desc *
 112 lmv_get_target(struct lmv_obd *lmv, u32 mds)
 113 {
 114         int count = lmv->desc.ld_tgt_count;
 115         int i;
 116
 117         for (i = 0; i < count; i++) {
 118                 if (lmv->tgts[i] == NULL)
 119                         continue;
 120
 121                 if (lmv->tgts[i]->ltd_idx == mds)
 122                         return lmv->tgts[i];
 123         }
 124
 125         return ERR_PTR(-ENODEV);
 126 }
 127
 128 static inline struct lmv_tgt_desc *
 129 lmv_find_target(struct lmv_obd *lmv, const struct lu_fid *fid)
 130 {
 131         u32 mds = 0;
 132         int rc;
 133
 134         if (lmv->desc.ld_tgt_count > 1) {
 135                 rc = lmv_fld_lookup(lmv, fid, &mds);
 136                 if (rc)
 137                         return ERR_PTR(rc);
 138         }
 139
 140         return lmv_get_target(lmv, mds);
 141 }
 142
 143 struct lmv_tgt_desc
 144 *lmv_locate_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
 145                 struct lu_fid *fid);
 146 /* lproc_lmv.c */
 147 #if defined (CONFIG_PROC_FS)
 148 void lprocfs_lmv_init_vars(struct lprocfs_static_vars *lvars);
 149 #else
 150 static inline void lprocfs_lmv_init_vars(struct lprocfs_static_vars *lvars)
 151 {
 152         memset(lvars, 0, sizeof(*lvars));
 153 }
 154 #endif
 155 extern struct file_operations lmv_proc_target_fops;
 156
 157 #endif