lustre/ptlrpc/llog_client.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2001-2004 Cluster File Systems, Inc.
   5  *   Author: Andreas Dilger <adilger@clusterfs.com>
   6  *
   7  *   This file is part of the Lustre file system, http://www.lustre.org
   8  *   Lustre is a trademark of Cluster File Systems, Inc.
   9  *
  10  *   You may have signed or agreed to another license before downloading
  11  *   this software.  If so, you are bound by the terms and conditions
  12  *   of that agreement, and the following does not apply to you.  See the
  13  *   LICENSE file included with this distribution for more information.
  14  *
  15  *   If you did not agree to a different license, then this copy of Lustre
  16  *   is open source software; you can redistribute it and/or modify it
  17  *   under the terms of version 2 of the GNU General Public License as
  18  *   published by the Free Software Foundation.
  19  *
  20  *   In either case, Lustre is distributed in the hope that it will be
  21  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  22  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *   license text for more details.
  24  *
  25  *  remote api for llog - client side
  26  *
  27  */
  28
  29 #define DEBUG_SUBSYSTEM S_LOG
  30
  31 #ifndef EXPORT_SYMTAB
  32 #define EXPORT_SYMTAB
  33 #endif
  34
  35 #ifdef __KERNEL__
  36 #include <libcfs/libcfs.h>
  37 #else
  38 #include <liblustre.h>
  39 #endif
  40
  41 #include <obd_class.h>
  42 #include <lustre_log.h>
  43 #include <lustre_net.h>
  44 #include <libcfs/list.h>
  45
  46 /* This is a callback from the llog_* functions.
  47  * Assumes caller has already pushed us into the kernel context. */
  48 static int llog_client_create(struct llog_ctxt *ctxt, struct llog_handle **res,
  49                               struct llog_logid *logid, char *name)
  50 {
  51         struct obd_import *imp;
  52         struct llogd_body req_body;
  53         struct llogd_body *body;
  54         struct llog_handle *handle;
  55         struct ptlrpc_request *req = NULL;
  56         int size[3] = { sizeof(struct ptlrpc_body), sizeof(req_body) };
  57         char *bufs[3] = { NULL, (char*)&req_body };
  58         int bufcount = 2;
  59         int rc;
  60         ENTRY;
  61
  62         if (ctxt->loc_imp == NULL) {
  63                 /* This used to be an assert; bug 6200 */
  64                 CERROR("ctxt->loc_imp == NULL for context idx %d.  Unable to "
  65                        "complete MDS/OSS recovery, but I'll try again next "
  66                        "time.  Not fatal.\n", ctxt->loc_idx);
  67                 RETURN(-EINVAL);
  68         }
  69         imp = ctxt->loc_imp;
  70
  71         handle = llog_alloc_handle();
  72         if (handle == NULL)
  73                 RETURN(-ENOMEM);
  74         *res = handle;
  75
  76         memset(&req_body, 0, sizeof(req_body));
  77         if (logid)
  78                 req_body.lgd_logid = *logid;
  79         req_body.lgd_ctxt_idx = ctxt->loc_idx - 1;
  80
  81         if (name) {
  82                 size[bufcount] = strlen(name) + 1;
  83                 bufs[bufcount] = name;
  84                 bufcount++;
  85         }
  86
  87         req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
  88                               LLOG_ORIGIN_HANDLE_CREATE, bufcount, size, bufs);
  89         if (!req)
  90                 GOTO(err_free, rc = -ENOMEM);
  91
  92         ptlrpc_req_set_repsize(req, 2, size);
  93         rc = ptlrpc_queue_wait(req);
  94         if (rc)
  95                 GOTO(err_free, rc);
  96
  97         body = lustre_swab_repbuf(req, REPLY_REC_OFF, sizeof(*body),
  98                                  lustre_swab_llogd_body);
  99         if (body == NULL) {
 100                 CERROR ("Can't unpack llogd_body\n");
 101                 GOTO(err_free, rc =-EFAULT);
 102         }
 103
 104         handle->lgh_id = body->lgd_logid;
 105         handle->lgh_ctxt = ctxt;
 106
 107 out:
 108         if (req)
 109                 ptlrpc_req_finished(req);
 110         RETURN(rc);
 111
 112 err_free:
 113         llog_free_handle(handle);
 114         goto out;
 115 }
 116
 117 static int llog_client_destroy(struct llog_handle *loghandle)
 118 {
 119         struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
 120         struct ptlrpc_request *req = NULL;
 121         struct llogd_body *body;
 122         int size[] = { sizeof(struct ptlrpc_body), sizeof(*body) };
 123         int rc;
 124         ENTRY;
 125
 126         req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
 127                               LLOG_ORIGIN_HANDLE_DESTROY, 2, size, NULL);
 128         if (!req)
 129                 RETURN(-ENOMEM);
 130
 131         body = lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF, sizeof(*body));
 132         body->lgd_logid = loghandle->lgh_id;
 133         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 134
 135         ptlrpc_req_set_repsize(req, 2, size);
 136         rc = ptlrpc_queue_wait(req);
 137
 138         ptlrpc_req_finished(req);
 139         RETURN(rc);
 140 }
 141
 142
 143 static int llog_client_next_block(struct llog_handle *loghandle,
 144                                   int *cur_idx, int next_idx,
 145                                   __u64 *cur_offset, void *buf, int len)
 146 {
 147         struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
 148         struct ptlrpc_request *req = NULL;
 149         struct llogd_body *body;
 150         void * ptr;
 151         int size[3] = { sizeof(struct ptlrpc_body), sizeof(*body) };
 152         int rc;
 153         ENTRY;
 154
 155         req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
 156                               LLOG_ORIGIN_HANDLE_NEXT_BLOCK, 2, size, NULL);
 157         if (!req)
 158                 GOTO(out, rc = -ENOMEM);
 159
 160         body = lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF, sizeof(*body));
 161         body->lgd_logid = loghandle->lgh_id;
 162         body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
 163         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 164         body->lgd_index = next_idx;
 165         body->lgd_saved_index = *cur_idx;
 166         body->lgd_len = len;
 167         body->lgd_cur_offset = *cur_offset;
 168
 169         size[REPLY_REC_OFF + 1] = len;
 170         ptlrpc_req_set_repsize(req, 3, size);
 171         rc = ptlrpc_queue_wait(req);
 172         if (rc)
 173                 GOTO(out, rc);
 174
 175         body = lustre_swab_repbuf(req, REPLY_REC_OFF, sizeof(*body),
 176                                  lustre_swab_llogd_body);
 177         if (body == NULL) {
 178                 CERROR ("Can't unpack llogd_body\n");
 179                 GOTO(out, rc =-EFAULT);
 180         }
 181
 182         /* The log records are swabbed as they are processed */
 183         ptr = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF + 1, len);
 184         if (ptr == NULL) {
 185                 CERROR ("Can't unpack bitmap\n");
 186                 GOTO(out, rc =-EFAULT);
 187         }
 188
 189         *cur_idx = body->lgd_saved_index;
 190         *cur_offset = body->lgd_cur_offset;
 191
 192         memcpy(buf, ptr, len);
 193
 194 out:
 195         if (req)
 196                 ptlrpc_req_finished(req);
 197         RETURN(rc);
 198 }
 199
 200 static int llog_client_prev_block(struct llog_handle *loghandle,
 201                                   int prev_idx, void *buf, int len)
 202 {
 203         struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
 204         struct ptlrpc_request *req = NULL;
 205         struct llogd_body *body;
 206         void * ptr;
 207         int size[3] = { sizeof(struct ptlrpc_body), sizeof(*body) };
 208         int rc;
 209         ENTRY;
 210
 211         req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
 212                               LLOG_ORIGIN_HANDLE_PREV_BLOCK, 2, size, NULL);
 213         if (!req)
 214                 GOTO(out, rc = -ENOMEM);
 215
 216         body = lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF, sizeof(*body));
 217         body->lgd_logid = loghandle->lgh_id;
 218         body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
 219         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 220         body->lgd_index = prev_idx;
 221         body->lgd_len = len;
 222
 223         size[REPLY_REC_OFF + 1] = len;
 224         ptlrpc_req_set_repsize(req, 3, size);
 225         rc = ptlrpc_queue_wait(req);
 226         if (rc)
 227                 GOTO(out, rc);
 228
 229         body = lustre_swab_repbuf(req, REPLY_REC_OFF, sizeof(*body),
 230                                  lustre_swab_llogd_body);
 231         if (body == NULL) {
 232                 CERROR ("Can't unpack llogd_body\n");
 233                 GOTO(out, rc =-EFAULT);
 234         }
 235
 236         ptr = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF + 1, len);
 237         if (ptr == NULL) {
 238                 CERROR ("Can't unpack bitmap\n");
 239                 GOTO(out, rc =-EFAULT);
 240         }
 241
 242         memcpy(buf, ptr, len);
 243
 244 out:
 245         if (req)
 246                 ptlrpc_req_finished(req);
 247         RETURN(rc);
 248 }
 249
 250 static int llog_client_read_header(struct llog_handle *handle)
 251 {
 252         struct obd_import *imp = handle->lgh_ctxt->loc_imp;
 253         struct ptlrpc_request *req = NULL;
 254         struct llogd_body *body;
 255         struct llog_log_hdr *hdr;
 256         struct llog_rec_hdr *llh_hdr;
 257         int size[2] = { sizeof(struct ptlrpc_body), sizeof(*body) };
 258         int repsize[2] = { sizeof(struct ptlrpc_body), sizeof(*hdr) };
 259         int rc;
 260         ENTRY;
 261
 262         req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
 263                               LLOG_ORIGIN_HANDLE_READ_HEADER, 2, size, NULL);
 264         if (!req)
 265                 GOTO(out, rc = -ENOMEM);
 266
 267         body = lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF, sizeof(*body));
 268         body->lgd_logid = handle->lgh_id;
 269         body->lgd_ctxt_idx = handle->lgh_ctxt->loc_idx - 1;
 270         body->lgd_llh_flags = handle->lgh_hdr->llh_flags;
 271
 272         ptlrpc_req_set_repsize(req, 2, repsize);
 273         rc = ptlrpc_queue_wait(req);
 274         if (rc)
 275                 GOTO(out, rc);
 276
 277         hdr = lustre_swab_repbuf(req, REPLY_REC_OFF, sizeof(*hdr),
 278                                  lustre_swab_llog_hdr);
 279         if (hdr == NULL) {
 280                 CERROR ("Can't unpack llog_hdr\n");
 281                 GOTO(out, rc =-EFAULT);
 282         }
 283
 284         memcpy(handle->lgh_hdr, hdr, sizeof (*hdr));
 285         handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
 286
 287         /* sanity checks */
 288         llh_hdr = &handle->lgh_hdr->llh_hdr;
 289         if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
 290                 CERROR("bad log header magic: %#x (expecting %#x)\n",
 291                        llh_hdr->lrh_type, LLOG_HDR_MAGIC);
 292                 rc = -EIO;
 293         } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
 294                 CERROR("incorrectly sized log header: %#x "
 295                        "(expecting %#x)\n",
 296                        llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
 297                 CERROR("you may need to re-run lconf --write_conf.\n");
 298                 rc = -EIO;
 299         }
 300
 301 out:
 302         if (req)
 303                 ptlrpc_req_finished(req);
 304         RETURN(rc);
 305 }
 306
 307 static int llog_client_close(struct llog_handle *handle)
 308 {
 309         /* this doesn't call LLOG_ORIGIN_HANDLE_CLOSE because
 310            the servers all close the file at the end of every
 311            other LLOG_ RPC. */
 312         return(0);
 313 }
 314
 315
 316 struct llog_operations llog_client_ops = {
 317         lop_next_block:  llog_client_next_block,
 318         lop_prev_block:  llog_client_prev_block,
 319         lop_read_header: llog_client_read_header,
 320         lop_create:      llog_client_create,
 321         lop_destroy:     llog_client_destroy,
 322         lop_close:       llog_client_close,
 323 };