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 Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  remote api for llog - client side
  23  *
  24  */
  25
  26 #define DEBUG_SUBSYSTEM S_LOG
  27
  28 #ifndef EXPORT_SYMTAB
  29 #define EXPORT_SYMTAB
  30 #endif
  31
  32 #ifdef __KERNEL__
  33 #include <linux/fs.h>
  34 #else
  35 #include <liblustre.h>
  36 #endif
  37
  38 #include <linux/obd_class.h>
  39 #include <linux/lustre_log.h>
  40 #include <linux/lustre_net.h>
  41 #include <portals/list.h>
  42
  43 /* This is a callback from the llog_* functions.
  44  * Assumes caller has already pushed us into the kernel context. */
  45 static int llog_client_open(struct llog_ctxt *ctxt, struct llog_handle **res,
  46                             struct llog_logid *logid, char *name, int flags)
  47 {
  48         struct obd_import *imp;
  49         struct llogd_body req_body;
  50         struct llogd_body *body;
  51         struct llog_handle *handle;
  52         struct ptlrpc_request *req = NULL;
  53         int size[2] = {sizeof(req_body)};
  54         char *tmp[2] = {(char*) &req_body};
  55         int bufcount = 1, repsize[] = {sizeof (req_body)}, rc;
  56         ENTRY;
  57
  58         LASSERT(ctxt->loc_imp);
  59         imp = ctxt->loc_imp;
  60
  61         handle = llog_alloc_handle();
  62         if (handle == NULL)
  63                 RETURN(-ENOMEM);
  64         *res = handle;
  65
  66         memset(&req_body, 0, sizeof(req_body));
  67         if (logid)
  68                 req_body.lgd_logid = *logid;
  69         req_body.lgd_ctxt_idx = ctxt->loc_idx - 1;
  70         req_body.lgd_llh_flags = flags;
  71
  72         if (name) {
  73                 size[bufcount] = strlen(name) + 1;
  74                 tmp[bufcount] = name;
  75                 bufcount++;
  76         }
  77
  78         req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION, LLOG_ORIGIN_HANDLE_OPEN,
  79                               bufcount, size,tmp);
  80         if (!req)
  81                 GOTO(err_free, rc = -ENOMEM);
  82
  83         req->rq_replen = lustre_msg_size(1, repsize);
  84         rc = ptlrpc_queue_wait(req);
  85         if (rc)
  86                 GOTO(err_free, rc);
  87
  88         body = lustre_swab_repbuf(req, 0, sizeof(*body),
  89                                  lustre_swab_llogd_body);
  90         if (body == NULL) {
  91                 CERROR ("Can't unpack llogd_body\n");
  92                 GOTO(err_free, rc =-EFAULT);
  93         }
  94
  95         handle->lgh_id = body->lgd_logid;
  96         handle->lgh_ctxt = ctxt;
  97
  98 out:
  99         if (req)
 100                 ptlrpc_req_finished(req);
 101         RETURN(rc);
 102
 103 err_free:
 104         llog_free_handle(handle);
 105         goto out;
 106 }
 107
 108 static int llog_client_prev_block(struct llog_handle *loghandle,
 109                                   int prev_idx, void *buf, int len)
 110 {
 111         struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
 112         struct ptlrpc_request *req = NULL;
 113         struct llogd_body *body;
 114         void * ptr;
 115         int size = sizeof(*body);
 116         int repsize[2] = {sizeof (*body)};
 117         int rc;
 118         ENTRY;
 119
 120         req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
 121                               LLOG_ORIGIN_HANDLE_PREV_BLOCK, 1, &size, NULL);
 122         if (!req)
 123                 GOTO(out, rc = -ENOMEM);
 124
 125         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 126         body->lgd_logid = loghandle->lgh_id;
 127         body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
 128         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 129         body->lgd_index = prev_idx;
 130         body->lgd_len = len;
 131         repsize[1] = len;
 132
 133         req->rq_replen = lustre_msg_size(2, repsize);
 134         rc = ptlrpc_queue_wait(req);
 135         if (rc)
 136                 GOTO(out, rc);
 137
 138         body = lustre_swab_repbuf(req, 0, sizeof(*body),
 139                                  lustre_swab_llogd_body);
 140         if (body == NULL) {
 141                 CERROR ("Can't unpack llogd_body\n");
 142                 GOTO(out, rc =-EFAULT);
 143         }
 144
 145         ptr = lustre_msg_buf(req->rq_repmsg, 1, len);
 146         if (ptr == NULL) {
 147                 CERROR ("Can't unpack bitmap\n");
 148                 GOTO(out, rc =-EFAULT);
 149         }
 150
 151         memcpy(buf, ptr, len);
 152 out:
 153         if (req)
 154                 ptlrpc_req_finished(req);
 155         RETURN(rc);
 156 }
 157
 158 static int llog_client_next_block(struct llog_handle *loghandle,
 159                                   int *cur_idx, int next_idx,
 160                                   __u64 *cur_offset, void *buf, int len)
 161 {
 162         struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
 163         struct ptlrpc_request *req = NULL;
 164         struct llogd_body *body;
 165         void * ptr;
 166         int size = sizeof(*body);
 167         int repsize[2] = {sizeof (*body)};
 168         int rc;
 169         ENTRY;
 170
 171         req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
 172                               LLOG_ORIGIN_HANDLE_NEXT_BLOCK, 1, &size, NULL);
 173         if (!req)
 174                 GOTO(out, rc = -ENOMEM);
 175
 176         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 177         body->lgd_logid = loghandle->lgh_id;
 178         body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
 179         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 180         body->lgd_index = next_idx;
 181         body->lgd_saved_index = *cur_idx;
 182         body->lgd_len = len;
 183         body->lgd_cur_offset = *cur_offset;
 184         repsize[1] = len;
 185
 186         req->rq_replen = lustre_msg_size(2, repsize);
 187         rc = ptlrpc_queue_wait(req);
 188         if (rc)
 189                 GOTO(out, rc);
 190
 191         body = lustre_swab_repbuf(req, 0, sizeof(*body),
 192                                  lustre_swab_llogd_body);
 193         if (body == NULL) {
 194                 CERROR ("Can't unpack llogd_body\n");
 195                 GOTO(out, rc =-EFAULT);
 196         }
 197
 198         ptr = lustre_msg_buf(req->rq_repmsg, 1, len);
 199         if (ptr == NULL) {
 200                 CERROR ("Can't unpack bitmap\n");
 201                 GOTO(out, rc =-EFAULT);
 202         }
 203
 204         *cur_idx = body->lgd_saved_index;
 205         *cur_offset = body->lgd_cur_offset;
 206
 207         memcpy(buf, ptr, len);
 208
 209 out:
 210         if (req)
 211                 ptlrpc_req_finished(req);
 212         RETURN(rc);
 213 }
 214
 215
 216 static int llog_client_read_header(struct llog_handle *handle)
 217 {
 218         struct obd_import *imp = handle->lgh_ctxt->loc_imp;
 219         struct ptlrpc_request *req = NULL;
 220         struct llogd_body *body;
 221         struct llog_log_hdr *hdr;
 222         struct llog_rec_hdr *llh_hdr;
 223         int size = sizeof(*body);
 224         int repsize = sizeof (*hdr);
 225         int rc;
 226         ENTRY;
 227
 228         req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
 229                               LLOG_ORIGIN_HANDLE_READ_HEADER, 1, &size, NULL);
 230         if (!req)
 231                 GOTO(out, rc = -ENOMEM);
 232
 233         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 234         body->lgd_logid = handle->lgh_id;
 235         body->lgd_ctxt_idx = handle->lgh_ctxt->loc_idx - 1;
 236         body->lgd_llh_flags = handle->lgh_hdr->llh_flags;
 237
 238         req->rq_replen = lustre_msg_size(1, &repsize);
 239         rc = ptlrpc_queue_wait(req);
 240         if (rc)
 241                 GOTO(out, rc);
 242
 243         hdr = lustre_swab_repbuf(req, 0, sizeof(*hdr), lustre_swab_llog_hdr);
 244         if (hdr == NULL) {
 245                 CERROR ("Can't unpack llog_hdr\n");
 246                 GOTO(out, rc =-EFAULT);
 247         }
 248
 249         memcpy(handle->lgh_hdr, hdr, sizeof (*hdr));
 250         handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
 251
 252         /* sanity checks */
 253         llh_hdr = &handle->lgh_hdr->llh_hdr;
 254         if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
 255                 CERROR("bad log header magic: %#x (expecting %#x)\n",
 256                        llh_hdr->lrh_type, LLOG_HDR_MAGIC);
 257                 rc = -EIO;
 258         } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
 259                 CERROR("incorrectly sized log header: %#x "
 260                        "(expecting %#x)\n",
 261                        llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
 262                 CERROR("you may need to re-run lconf --write_conf.\n");
 263                 rc = -EIO;
 264         }
 265
 266 out:
 267         if (req)
 268                 ptlrpc_req_finished(req);
 269         RETURN(rc);
 270 }
 271
 272 static int llog_client_close(struct llog_handle *handle)
 273 {
 274         int rc = 0;
 275
 276         RETURN(rc);
 277 }
 278
 279
 280 struct llog_operations llog_client_ops = {
 281         lop_prev_block:  llog_client_prev_block,
 282         lop_next_block:  llog_client_next_block,
 283         lop_read_header: llog_client_read_header,
 284         lop_open:        llog_client_open,
 285         lop_close:       llog_client_close,
 286 };