lustre/ptlrpc/llog_client.c

   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) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 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  * lustre/ptlrpc/llog_client.c
  37  *
  38  * remote api for llog - client side
  39  *
  40  * Author: Andreas Dilger <adilger@clusterfs.com>
  41  */
  42
  43 #define DEBUG_SUBSYSTEM S_LOG
  44
  45 #include <libcfs/libcfs.h>
  46
  47 #include <obd_class.h>
  48 #include <lustre_log.h>
  49 #include <lustre_net.h>
  50 #include <libcfs/list.h>
  51
  52 #define LLOG_CLIENT_ENTRY(ctxt, imp) do {                             \
  53         mutex_lock(&ctxt->loc_mutex);                             \
  54         if (ctxt->loc_imp) {                                          \
  55                 imp = class_import_get(ctxt->loc_imp);                \
  56         } else {                                                      \
  57                 CERROR("ctxt->loc_imp == NULL for context idx %d."    \
  58                        "Unable to complete MDS/OSS recovery,"         \
  59                        "but I'll try again next time.  Not fatal.\n", \
  60                        ctxt->loc_idx);                                \
  61                 imp = NULL;                                           \
  62                 mutex_unlock(&ctxt->loc_mutex);                   \
  63                 return (-EINVAL);                                     \
  64         }                                                             \
  65         mutex_unlock(&ctxt->loc_mutex);                           \
  66 } while(0)
  67
  68 #define LLOG_CLIENT_EXIT(ctxt, imp) do {                              \
  69         mutex_lock(&ctxt->loc_mutex);                             \
  70         if (ctxt->loc_imp != imp)                                     \
  71                 CWARN("loc_imp has changed from %p to %p\n",          \
  72                        ctxt->loc_imp, imp);                           \
  73         class_import_put(imp);                                        \
  74         mutex_unlock(&ctxt->loc_mutex);                           \
  75 } while(0)
  76
  77 /* This is a callback from the llog_* functions.
  78  * Assumes caller has already pushed us into the kernel context. */
  79 static int llog_client_open(const struct lu_env *env,
  80                             struct llog_handle *lgh, struct llog_logid *logid,
  81                             char *name, enum llog_open_param open_param)
  82 {
  83         struct obd_import     *imp;
  84         struct llogd_body     *body;
  85         struct llog_ctxt      *ctxt = lgh->lgh_ctxt;
  86         struct ptlrpc_request *req = NULL;
  87         int                    rc;
  88         ENTRY;
  89
  90         LLOG_CLIENT_ENTRY(ctxt, imp);
  91
  92         /* client cannot create llog */
  93         LASSERTF(open_param != LLOG_OPEN_NEW, "%#x\n", open_param);
  94         LASSERT(lgh);
  95
  96         req = ptlrpc_request_alloc(imp, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
  97         if (req == NULL)
  98                 GOTO(out, rc = -ENOMEM);
  99
 100         if (name)
 101                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 102                                      strlen(name) + 1);
 103
 104         rc = ptlrpc_request_pack(req, LUSTRE_LOG_VERSION,
 105                                  LLOG_ORIGIN_HANDLE_CREATE);
 106         if (rc) {
 107                 ptlrpc_request_free(req);
 108                 req = NULL;
 109                 GOTO(out, rc);
 110         }
 111         ptlrpc_request_set_replen(req);
 112
 113         body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
 114         if (logid)
 115                 body->lgd_logid = *logid;
 116         body->lgd_ctxt_idx = ctxt->loc_idx - 1;
 117
 118         if (name) {
 119                 char *tmp;
 120                 tmp = req_capsule_client_sized_get(&req->rq_pill, &RMF_NAME,
 121                                                    strlen(name) + 1);
 122                 LASSERT(tmp);
 123                 strcpy(tmp, name);
 124         }
 125
 126         rc = ptlrpc_queue_wait(req);
 127         if (rc)
 128                 GOTO(out, rc);
 129
 130         body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
 131         if (body == NULL)
 132                 GOTO(out, rc = -EFAULT);
 133
 134         lgh->lgh_id = body->lgd_logid;
 135         lgh->lgh_ctxt = ctxt;
 136         EXIT;
 137 out:
 138         LLOG_CLIENT_EXIT(ctxt, imp);
 139         ptlrpc_req_finished(req);
 140         return rc;
 141 }
 142
 143 static int llog_client_destroy(const struct lu_env *env,
 144                                struct llog_handle *loghandle)
 145 {
 146         struct obd_import     *imp;
 147         struct ptlrpc_request *req = NULL;
 148         struct llogd_body     *body;
 149         int                    rc;
 150         ENTRY;
 151
 152         LLOG_CLIENT_ENTRY(loghandle->lgh_ctxt, imp);
 153         req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_DESTROY,
 154                                         LUSTRE_LOG_VERSION,
 155                                         LLOG_ORIGIN_HANDLE_DESTROY);
 156         if (req == NULL)
 157                 GOTO(err_exit, rc =-ENOMEM);
 158
 159         body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
 160         body->lgd_logid = loghandle->lgh_id;
 161         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 162
 163         if (!(body->lgd_llh_flags & LLOG_F_IS_PLAIN))
 164                 CERROR("%s: wrong llog flags %x\n", imp->imp_obd->obd_name,
 165                        body->lgd_llh_flags);
 166
 167         ptlrpc_request_set_replen(req);
 168         rc = ptlrpc_queue_wait(req);
 169
 170         ptlrpc_req_finished(req);
 171 err_exit:
 172         LLOG_CLIENT_EXIT(loghandle->lgh_ctxt, imp);
 173         RETURN(rc);
 174 }
 175
 176
 177 static int llog_client_next_block(const struct lu_env *env,
 178                                   struct llog_handle *loghandle,
 179                                   int *cur_idx, int next_idx,
 180                                   __u64 *cur_offset, void *buf, int len)
 181 {
 182         struct obd_import     *imp;
 183         struct ptlrpc_request *req = NULL;
 184         struct llogd_body     *body;
 185         void                  *ptr;
 186         int                    rc;
 187         ENTRY;
 188
 189         LLOG_CLIENT_ENTRY(loghandle->lgh_ctxt, imp);
 190         req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK,
 191                                         LUSTRE_LOG_VERSION,
 192                                         LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
 193         if (req == NULL)
 194                 GOTO(err_exit, rc =-ENOMEM);
 195
 196         body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
 197         body->lgd_logid = loghandle->lgh_id;
 198         body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
 199         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 200         body->lgd_index = next_idx;
 201         body->lgd_saved_index = *cur_idx;
 202         body->lgd_len = len;
 203         body->lgd_cur_offset = *cur_offset;
 204
 205         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER, len);
 206         ptlrpc_request_set_replen(req);
 207         rc = ptlrpc_queue_wait(req);
 208         if (rc)
 209                 GOTO(out, rc);
 210
 211         body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
 212         if (body == NULL)
 213                 GOTO(out, rc =-EFAULT);
 214
 215         /* The log records are swabbed as they are processed */
 216         ptr = req_capsule_server_get(&req->rq_pill, &RMF_EADATA);
 217         if (ptr == NULL)
 218                 GOTO(out, rc =-EFAULT);
 219
 220         *cur_idx = body->lgd_saved_index;
 221         *cur_offset = body->lgd_cur_offset;
 222
 223         memcpy(buf, ptr, len);
 224         EXIT;
 225 out:
 226         ptlrpc_req_finished(req);
 227 err_exit:
 228         LLOG_CLIENT_EXIT(loghandle->lgh_ctxt, imp);
 229         return rc;
 230 }
 231
 232 static int llog_client_prev_block(const struct lu_env *env,
 233                                   struct llog_handle *loghandle,
 234                                   int prev_idx, void *buf, int len)
 235 {
 236         struct obd_import     *imp;
 237         struct ptlrpc_request *req = NULL;
 238         struct llogd_body     *body;
 239         void                  *ptr;
 240         int                    rc;
 241         ENTRY;
 242
 243         LLOG_CLIENT_ENTRY(loghandle->lgh_ctxt, imp);
 244         req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_PREV_BLOCK,
 245                                         LUSTRE_LOG_VERSION,
 246                                         LLOG_ORIGIN_HANDLE_PREV_BLOCK);
 247         if (req == NULL)
 248                 GOTO(err_exit, rc = -ENOMEM);
 249
 250         body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
 251         body->lgd_logid = loghandle->lgh_id;
 252         body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
 253         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 254         body->lgd_index = prev_idx;
 255         body->lgd_len = len;
 256
 257         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER, len);
 258         ptlrpc_request_set_replen(req);
 259
 260         rc = ptlrpc_queue_wait(req);
 261         if (rc)
 262                 GOTO(out, rc);
 263
 264         body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
 265         if (body == NULL)
 266                 GOTO(out, rc =-EFAULT);
 267
 268         ptr = req_capsule_server_get(&req->rq_pill, &RMF_EADATA);
 269         if (ptr == NULL)
 270                 GOTO(out, rc =-EFAULT);
 271
 272         memcpy(buf, ptr, len);
 273         EXIT;
 274 out:
 275         ptlrpc_req_finished(req);
 276 err_exit:
 277         LLOG_CLIENT_EXIT(loghandle->lgh_ctxt, imp);
 278         return rc;
 279 }
 280
 281 static int llog_client_read_header(const struct lu_env *env,
 282                                    struct llog_handle *handle)
 283 {
 284         struct obd_import     *imp;
 285         struct ptlrpc_request *req = NULL;
 286         struct llogd_body     *body;
 287         struct llog_log_hdr   *hdr;
 288         struct llog_rec_hdr   *llh_hdr;
 289         int                    rc;
 290         ENTRY;
 291
 292         LLOG_CLIENT_ENTRY(handle->lgh_ctxt, imp);
 293         req = ptlrpc_request_alloc_pack(imp,&RQF_LLOG_ORIGIN_HANDLE_READ_HEADER,
 294                                         LUSTRE_LOG_VERSION,
 295                                         LLOG_ORIGIN_HANDLE_READ_HEADER);
 296         if (req == NULL)
 297                 GOTO(err_exit, rc = -ENOMEM);
 298
 299         body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
 300         body->lgd_logid = handle->lgh_id;
 301         body->lgd_ctxt_idx = handle->lgh_ctxt->loc_idx - 1;
 302         body->lgd_llh_flags = handle->lgh_hdr->llh_flags;
 303
 304         ptlrpc_request_set_replen(req);
 305         rc = ptlrpc_queue_wait(req);
 306         if (rc)
 307                 GOTO(out, rc);
 308
 309         hdr = req_capsule_server_get(&req->rq_pill, &RMF_LLOG_LOG_HDR);
 310         if (hdr == NULL)
 311                 GOTO(out, rc =-EFAULT);
 312
 313         memcpy(handle->lgh_hdr, hdr, sizeof (*hdr));
 314         handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
 315
 316         /* sanity checks */
 317         llh_hdr = &handle->lgh_hdr->llh_hdr;
 318         if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
 319                 CERROR("bad log header magic: %#x (expecting %#x)\n",
 320                        llh_hdr->lrh_type, LLOG_HDR_MAGIC);
 321                 rc = -EIO;
 322         } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
 323                 CERROR("incorrectly sized log header: %#x "
 324                        "(expecting %#x)\n",
 325                        llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
 326                 CERROR("you may need to re-run lconf --write_conf.\n");
 327                 rc = -EIO;
 328         }
 329         EXIT;
 330 out:
 331         ptlrpc_req_finished(req);
 332 err_exit:
 333         LLOG_CLIENT_EXIT(handle->lgh_ctxt, imp);
 334         return rc;
 335 }
 336
 337 static int llog_client_close(const struct lu_env *env,
 338                              struct llog_handle *handle)
 339 {
 340         /* this doesn't call LLOG_ORIGIN_HANDLE_CLOSE because
 341            the servers all close the file at the end of every
 342            other LLOG_ RPC. */
 343         return(0);
 344 }
 345
 346 struct llog_operations llog_client_ops = {
 347         .lop_next_block         = llog_client_next_block,
 348         .lop_prev_block         = llog_client_prev_block,
 349         .lop_read_header        = llog_client_read_header,
 350         .lop_open               = llog_client_open,
 351         .lop_destroy            = llog_client_destroy,
 352         .lop_close              = llog_client_close,
 353 };
 354 EXPORT_SYMBOL(llog_client_ops);