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, LLOG_ORIGIN_HANDLE_OPEN, bufcount, size,tmp);
  79         if (!req)
  80                 GOTO(err_free, rc = -ENOMEM);
  81
  82         req->rq_replen = lustre_msg_size(1, repsize);
  83         rc = ptlrpc_queue_wait(req);
  84         if (rc)
  85                 GOTO(err_free, rc);
  86
  87         body = lustre_swab_repbuf(req, 0, sizeof(*body),
  88                                  lustre_swab_llogd_body);
  89         if (body == NULL) {
  90                 CERROR ("Can't unpack llogd_body\n");
  91                 GOTO(err_free, rc =-EFAULT);
  92         }
  93
  94         handle->lgh_id = body->lgd_logid;
  95         handle->lgh_ctxt = ctxt;
  96
  97 out:
  98         if (req)
  99                 ptlrpc_req_finished(req);
 100         RETURN(rc);
 101
 102 err_free:
 103         llog_free_handle(handle);
 104         goto out;
 105 }
 106
 107 static int llog_client_prev_block(struct llog_handle *loghandle,
 108                                   int prev_idx, void *buf, int len)
 109 {
 110         struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
 111         struct ptlrpc_request *req = NULL;
 112         struct llogd_body *body;
 113         void * ptr;
 114         int size = sizeof(*body);
 115         int repsize[2] = {sizeof (*body)};
 116         int rc;
 117         ENTRY;
 118
 119         req = ptlrpc_prep_req(imp, LLOG_ORIGIN_HANDLE_PREV_BLOCK, 1,&size,NULL);
 120         if (!req)
 121                 GOTO(out, rc = -ENOMEM);
 122
 123         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 124         body->lgd_logid = loghandle->lgh_id;
 125         body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
 126         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 127         body->lgd_index = prev_idx;
 128         body->lgd_len = len;
 129         repsize[1] = len;
 130
 131         req->rq_replen = lustre_msg_size(2, repsize);
 132         rc = ptlrpc_queue_wait(req);
 133         if (rc)
 134                 GOTO(out, rc);
 135
 136         body = lustre_swab_repbuf(req, 0, sizeof(*body),
 137                                  lustre_swab_llogd_body);
 138         if (body == NULL) {
 139                 CERROR ("Can't unpack llogd_body\n");
 140                 GOTO(out, rc =-EFAULT);
 141         }
 142
 143         ptr = lustre_msg_buf(req->rq_repmsg, 1, len);
 144         if (ptr == NULL) {
 145                 CERROR ("Can't unpack bitmap\n");
 146                 GOTO(out, rc =-EFAULT);
 147         }
 148
 149         memcpy(buf, ptr, len);
 150
 151 out:
 152         if (req)
 153                 ptlrpc_req_finished(req);
 154         RETURN(rc);
 155 }
 156
 157 static int llog_client_next_block(struct llog_handle *loghandle,
 158                                   int *cur_idx, int next_idx,
 159                                   __u64 *cur_offset, void *buf, int len)
 160 {
 161         struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
 162         struct ptlrpc_request *req = NULL;
 163         struct llogd_body *body;
 164         void * ptr;
 165         int size = sizeof(*body);
 166         int repsize[2] = {sizeof (*body)};
 167         int rc;
 168         ENTRY;
 169
 170         req = ptlrpc_prep_req(imp, LLOG_ORIGIN_HANDLE_NEXT_BLOCK, 1,&size,NULL);
 171         if (!req)
 172                 GOTO(out, rc = -ENOMEM);
 173
 174         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 175         body->lgd_logid = loghandle->lgh_id;
 176         body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
 177         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 178         body->lgd_index = next_idx;
 179         body->lgd_saved_index = *cur_idx;
 180         body->lgd_len = len;
 181         body->lgd_cur_offset = *cur_offset;
 182         repsize[1] = len;
 183
 184         req->rq_replen = lustre_msg_size(2, repsize);
 185         rc = ptlrpc_queue_wait(req);
 186         if (rc)
 187                 GOTO(out, rc);
 188
 189         body = lustre_swab_repbuf(req, 0, sizeof(*body),
 190                                  lustre_swab_llogd_body);
 191         if (body == NULL) {
 192                 CERROR ("Can't unpack llogd_body\n");
 193                 GOTO(out, rc =-EFAULT);
 194         }
 195
 196         ptr = lustre_msg_buf(req->rq_repmsg, 1, len);
 197         if (ptr == NULL) {
 198                 CERROR ("Can't unpack bitmap\n");
 199                 GOTO(out, rc =-EFAULT);
 200         }
 201
 202         *cur_idx = body->lgd_saved_index;
 203         *cur_offset = body->lgd_cur_offset;
 204
 205         memcpy(buf, ptr, len);
 206
 207 out:
 208         if (req)
 209                 ptlrpc_req_finished(req);
 210         RETURN(rc);
 211 }
 212
 213
 214 static int llog_client_read_header(struct llog_handle *handle)
 215 {
 216         struct obd_import *imp = handle->lgh_ctxt->loc_imp;
 217         struct ptlrpc_request *req = NULL;
 218         struct llogd_body *body;
 219         struct llog_log_hdr *hdr;
 220         struct llog_rec_hdr *llh_hdr;
 221         int size = sizeof(*body);
 222         int repsize = sizeof (*hdr);
 223         int rc;
 224         ENTRY;
 225
 226         req = ptlrpc_prep_req(imp, LLOG_ORIGIN_HANDLE_READ_HEADER,1,&size,NULL);
 227         if (!req)
 228                 GOTO(out, rc = -ENOMEM);
 229
 230         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 231         body->lgd_logid = handle->lgh_id;
 232         body->lgd_ctxt_idx = handle->lgh_ctxt->loc_idx - 1;
 233         body->lgd_llh_flags = handle->lgh_hdr->llh_flags;
 234
 235         req->rq_replen = lustre_msg_size(1, &repsize);
 236         rc = ptlrpc_queue_wait(req);
 237         if (rc)
 238                 GOTO(out, rc);
 239
 240         hdr = lustre_swab_repbuf(req, 0, sizeof(*hdr), lustre_swab_llog_hdr);
 241         if (hdr == NULL) {
 242                 CERROR ("Can't unpack llog_hdr\n");
 243                 GOTO(out, rc =-EFAULT);
 244         }
 245
 246         memcpy(handle->lgh_hdr, hdr, sizeof (*hdr));
 247         handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
 248
 249         /* sanity checks */
 250         llh_hdr = &handle->lgh_hdr->llh_hdr;
 251         if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
 252                 CERROR("bad log header magic: %#x (expecting %#x)\n",
 253                        llh_hdr->lrh_type, LLOG_HDR_MAGIC);
 254                 rc = -EIO;
 255         } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
 256                 CERROR("incorrectly sized log header: %#x "
 257                        "(expecting %#x)\n",
 258                        llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
 259                 CERROR("you may need to re-run lconf --write_conf.\n");
 260                 rc = -EIO;
 261         }
 262
 263 out:
 264         if (req)
 265                 ptlrpc_req_finished(req);
 266         RETURN(rc);
 267 }
 268
 269 static int llog_client_close(struct llog_handle *handle)
 270 {
 271         int rc = 0;
 272
 273         RETURN(rc);
 274 }
 275
 276
 277 struct llog_operations llog_client_ops = {
 278         lop_prev_block:  llog_client_prev_block,
 279         lop_next_block:  llog_client_next_block,
 280         lop_read_header: llog_client_read_header,
 281         lop_open:        llog_client_open,
 282         lop_close:       llog_client_close,
 283 };