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) 2001-2003 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_create(struct llog_ctxt *ctxt, struct llog_handle **res,
  46                             struct llog_logid *logid, char *name)
  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;
  56         int repsize[] = {sizeof (req_body)};
  57         int rc;
  58         ENTRY;
  59
  60         LASSERT(ctxt->loc_imp);
  61         imp = ctxt->loc_imp;
  62
  63         handle = llog_alloc_handle();
  64         if (handle == NULL)
  65                 RETURN(-ENOMEM);
  66         *res = handle;
  67
  68         memset(&req_body, 0, sizeof(req_body));
  69         if (logid)
  70                 req_body.lgd_logid = *logid;
  71         req_body.lgd_ctxt_idx = ctxt->loc_idx - 1;
  72
  73         if (name) {
  74                 size[bufcount] = strlen(name) + 1;
  75                 tmp[bufcount] = name;
  76                 bufcount++;
  77         }
  78
  79         req = ptlrpc_prep_req(imp, LLOG_ORIGIN_HANDLE_CREATE,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
 109 static int llog_client_next_block(struct llog_handle *loghandle,
 110                                   int *cur_idx, int next_idx,
 111                                   __u64 *cur_offset, void *buf, int len)
 112 {
 113         struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
 114         struct ptlrpc_request *req = NULL;
 115         struct llogd_body *body;
 116         void * ptr;
 117         int size = sizeof(*body);
 118         int repsize[2] = {sizeof (*body)};
 119         int rc;
 120         ENTRY;
 121
 122         req = ptlrpc_prep_req(imp, LLOG_ORIGIN_HANDLE_NEXT_BLOCK, 1,&size,NULL);
 123         if (!req)
 124                 GOTO(out, rc = -ENOMEM);
 125
 126         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 127         body->lgd_logid = loghandle->lgh_id;
 128         body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
 129         body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
 130         body->lgd_index = next_idx;
 131         body->lgd_saved_index = *cur_idx;
 132         body->lgd_len = len;
 133         body->lgd_cur_offset = *cur_offset;
 134         repsize[1] = len;
 135
 136         req->rq_replen = lustre_msg_size(2, repsize);
 137         rc = ptlrpc_queue_wait(req);
 138         if (rc)
 139                 GOTO(out, rc);
 140
 141         body = lustre_swab_repbuf(req, 0, sizeof(*body),
 142                                  lustre_swab_llogd_body);
 143         if (body == NULL) {
 144                 CERROR ("Can't unpack llogd_body\n");
 145                 GOTO(out, rc =-EFAULT);
 146         }
 147
 148         ptr = lustre_msg_buf(req->rq_repmsg, 1, len);
 149         if (ptr == NULL) {
 150                 CERROR ("Can't unpack bitmap\n");
 151                 GOTO(out, rc =-EFAULT);
 152         }
 153
 154         *cur_idx = body->lgd_saved_index;
 155         *cur_offset = body->lgd_cur_offset;
 156
 157         memcpy(buf, ptr, len);
 158
 159 out:
 160         if (req)
 161                 ptlrpc_req_finished(req);
 162         RETURN(rc);
 163 }
 164
 165
 166 static int llog_client_read_header(struct llog_handle *handle)
 167 {
 168         struct obd_import *imp = handle->lgh_ctxt->loc_imp;
 169         struct ptlrpc_request *req = NULL;
 170         struct llogd_body *body;
 171         struct llog_log_hdr *hdr;
 172         int size = sizeof(*body);
 173         int repsize = sizeof (*hdr);
 174         int rc;
 175         ENTRY;
 176
 177         req = ptlrpc_prep_req(imp, LLOG_ORIGIN_HANDLE_READ_HEADER,1,&size,NULL);
 178         if (!req)
 179                 GOTO(out, rc = -ENOMEM);
 180
 181         body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
 182         body->lgd_logid = handle->lgh_id;
 183         body->lgd_ctxt_idx = handle->lgh_ctxt->loc_idx - 1;
 184         body->lgd_llh_flags = handle->lgh_hdr->llh_flags;
 185
 186         req->rq_replen = lustre_msg_size(1, &repsize);
 187         rc = ptlrpc_queue_wait(req);
 188         if (rc)
 189                 GOTO(out, rc);
 190
 191         hdr = lustre_swab_repbuf(req, 0, sizeof(*hdr), lustre_swab_llog_hdr);
 192         if (hdr == NULL) {
 193                 CERROR ("Can't unpack llog_hdr\n");
 194                 GOTO(out, rc =-EFAULT);
 195         }
 196         memcpy(handle->lgh_hdr, hdr, sizeof (*hdr));
 197         handle->lgh_last_idx = le32_to_cpu(handle->lgh_hdr->llh_tail.lrt_index);
 198
 199 out:
 200         if (req)
 201                 ptlrpc_req_finished(req);
 202         RETURN(rc);
 203 }
 204
 205 static int llog_client_close(struct llog_handle *handle)
 206 {
 207         int rc = 0;
 208
 209         RETURN(rc);
 210 }
 211
 212
 213 struct llog_operations llog_client_ops = {
 214         lop_next_block:  llog_client_next_block,
 215         lop_read_header: llog_client_read_header,
 216         lop_create:      llog_client_create,
 217         lop_close:       llog_client_close,
 218 };