lustre/ptlrpc/llog_server.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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/ptlrpc/llog_server.c
  33  *
  34  * remote api for llog - server side
  35  *
  36  * Author: Andreas Dilger <adilger@clusterfs.com>
  37  */
  38
  39 #define DEBUG_SUBSYSTEM S_LOG
  40
  41 #include <obd_class.h>
  42 #include <lu_target.h>
  43 #include <lustre_log.h>
  44 #include <lustre_net.h>
  45
  46 static int llog_origin_close(const struct lu_env *env, struct llog_handle *lgh)
  47 {
  48         if (lgh->lgh_hdr != NULL && lgh->lgh_hdr->llh_flags & LLOG_F_IS_CAT)
  49                 return llog_cat_close(env, lgh);
  50         else
  51                 return llog_close(env, lgh);
  52 }
  53
  54 /* Only open is supported, no new llog can be created remotely */
  55 int llog_origin_handle_open(struct ptlrpc_request *req)
  56 {
  57         struct obd_export       *exp = req->rq_export;
  58         struct obd_device       *obd = exp->exp_obd;
  59         struct llog_handle      *loghandle;
  60         struct llogd_body       *body;
  61         struct llog_logid       *logid = NULL;
  62         struct llog_ctxt        *ctxt;
  63         char                    *name = NULL;
  64         int                      rc;
  65
  66         ENTRY;
  67
  68         body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
  69         if (body == NULL)
  70                 RETURN(err_serious(-EFAULT));
  71
  72         rc = req_capsule_server_pack(&req->rq_pill);
  73         if (rc)
  74                 RETURN(err_serious(-ENOMEM));
  75
  76         if (ostid_id(&body->lgd_logid.lgl_oi) > 0)
  77                 logid = &body->lgd_logid;
  78
  79         if (req_capsule_field_present(&req->rq_pill, &RMF_NAME, RCL_CLIENT)) {
  80                 name = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
  81                 if (name == NULL)
  82                         RETURN(-EFAULT);
  83                 CDEBUG(D_INFO, "%s: opening log %s\n", obd->obd_name, name);
  84         }
  85
  86         if (body->lgd_ctxt_idx >= LLOG_MAX_CTXTS) {
  87                 CDEBUG(D_WARNING, "%s: bad ctxt ID: idx=%d name=%s\n",
  88                        obd->obd_name, body->lgd_ctxt_idx, name);
  89                 RETURN(-EPROTO);
  90         }
  91
  92         ctxt = llog_get_context(obd, body->lgd_ctxt_idx);
  93         if (ctxt == NULL) {
  94                 CDEBUG(D_WARNING, "%s: no ctxt. group=%p idx=%d name=%s\n",
  95                        obd->obd_name, &obd->obd_olg, body->lgd_ctxt_idx, name);
  96                 RETURN(-ENODEV);
  97         }
  98
  99         rc = llog_open(req->rq_svc_thread->t_env, ctxt, &loghandle, logid,
 100                        name, LLOG_OPEN_EXISTS);
 101         if (rc)
 102                 GOTO(out_ctxt, rc);
 103
 104         body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
 105         body->lgd_logid = loghandle->lgh_id;
 106
 107         llog_origin_close(req->rq_svc_thread->t_env, loghandle);
 108         EXIT;
 109 out_ctxt:
 110         llog_ctxt_put(ctxt);
 111         return rc;
 112 }
 113
 114 int llog_origin_handle_next_block(struct ptlrpc_request *req)
 115 {
 116         struct llog_handle      *loghandle;
 117         struct llogd_body       *body;
 118         struct llogd_body       *repbody;
 119         struct llog_ctxt        *ctxt;
 120         __u32                    flags;
 121         void                    *ptr;
 122         int                      rc;
 123
 124         ENTRY;
 125
 126         body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
 127         if (body == NULL)
 128                 RETURN(err_serious(-EFAULT));
 129
 130         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER,
 131                              LLOG_MIN_CHUNK_SIZE);
 132         rc = req_capsule_server_pack(&req->rq_pill);
 133         if (rc)
 134                 RETURN(err_serious(-ENOMEM));
 135
 136         if (body->lgd_ctxt_idx >= LLOG_MAX_CTXTS) {
 137                 CDEBUG(D_WARNING, "%s: bad ctxt ID: idx=%d\n",
 138                        req->rq_export->exp_obd->obd_name, body->lgd_ctxt_idx);
 139                 RETURN(-EPROTO);
 140         }
 141
 142         ctxt = llog_get_context(req->rq_export->exp_obd, body->lgd_ctxt_idx);
 143         if (ctxt == NULL)
 144                 RETURN(-ENODEV);
 145         if (OBD_FAIL_PRECHECK(OBD_FAIL_MDS_LLOG_UMOUNT_RACE))
 146                 cfs_fail_val = 1;
 147
 148         rc = llog_open(req->rq_svc_thread->t_env, ctxt, &loghandle,
 149                        &body->lgd_logid, NULL, LLOG_OPEN_EXISTS);
 150         if (rc)
 151                 GOTO(out_ctxt, rc);
 152
 153         flags = body->lgd_llh_flags;
 154         rc = llog_init_handle(req->rq_svc_thread->t_env, loghandle, flags,
 155                               NULL);
 156         if (rc)
 157                 GOTO(out_close, rc);
 158
 159         repbody = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
 160         *repbody = *body;
 161
 162         ptr = req_capsule_server_get(&req->rq_pill, &RMF_EADATA);
 163         rc = llog_next_block(req->rq_svc_thread->t_env, loghandle,
 164                              &repbody->lgd_saved_index, repbody->lgd_index,
 165                              &repbody->lgd_cur_offset, ptr,
 166                              LLOG_MIN_CHUNK_SIZE);
 167         if (rc)
 168                 GOTO(out_close, rc);
 169         EXIT;
 170 out_close:
 171         llog_origin_close(req->rq_svc_thread->t_env, loghandle);
 172 out_ctxt:
 173         llog_ctxt_put(ctxt);
 174         return rc;
 175 }
 176
 177 int llog_origin_handle_prev_block(struct ptlrpc_request *req)
 178 {
 179         struct llog_handle      *loghandle;
 180         struct llogd_body       *body;
 181         struct llogd_body       *repbody;
 182         struct llog_ctxt        *ctxt;
 183         __u32                    flags;
 184         void                    *ptr;
 185         int                      rc;
 186
 187         ENTRY;
 188
 189         body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
 190         if (body == NULL)
 191                 RETURN(err_serious(-EFAULT));
 192
 193         req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER,
 194                              LLOG_MIN_CHUNK_SIZE);
 195         rc = req_capsule_server_pack(&req->rq_pill);
 196         if (rc)
 197                 RETURN(err_serious(-ENOMEM));
 198
 199         if (body->lgd_ctxt_idx >= LLOG_MAX_CTXTS) {
 200                 CDEBUG(D_WARNING, "%s: bad ctxt ID: idx=%d\n",
 201                        req->rq_export->exp_obd->obd_name, body->lgd_ctxt_idx);
 202                 RETURN(-EPROTO);
 203         }
 204
 205         ctxt = llog_get_context(req->rq_export->exp_obd, body->lgd_ctxt_idx);
 206         if (ctxt == NULL)
 207                 RETURN(-ENODEV);
 208
 209         rc = llog_open(req->rq_svc_thread->t_env, ctxt, &loghandle,
 210                          &body->lgd_logid, NULL, LLOG_OPEN_EXISTS);
 211         if (rc)
 212                 GOTO(out_ctxt, rc);
 213
 214         flags = body->lgd_llh_flags;
 215         rc = llog_init_handle(req->rq_svc_thread->t_env, loghandle, flags,
 216                               NULL);
 217         if (rc)
 218                 GOTO(out_close, rc);
 219
 220         repbody = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
 221         *repbody = *body;
 222
 223         ptr = req_capsule_server_get(&req->rq_pill, &RMF_EADATA);
 224         rc = llog_prev_block(req->rq_svc_thread->t_env, loghandle,
 225                              body->lgd_index, ptr, LLOG_MIN_CHUNK_SIZE);
 226         if (rc)
 227                 GOTO(out_close, rc);
 228
 229         EXIT;
 230 out_close:
 231         llog_origin_close(req->rq_svc_thread->t_env, loghandle);
 232 out_ctxt:
 233         llog_ctxt_put(ctxt);
 234         return rc;
 235 }
 236
 237 int llog_origin_handle_read_header(struct ptlrpc_request *req)
 238 {
 239         struct llog_handle      *loghandle;
 240         struct llogd_body       *body;
 241         struct llog_log_hdr     *hdr;
 242         struct llog_ctxt        *ctxt;
 243         __u32                    flags;
 244         int                      rc;
 245
 246         ENTRY;
 247
 248         body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
 249         if (body == NULL)
 250                 RETURN(err_serious(-EFAULT));
 251
 252         rc = req_capsule_server_pack(&req->rq_pill);
 253         if (rc)
 254                 RETURN(err_serious(-ENOMEM));
 255
 256         if (body->lgd_ctxt_idx >= LLOG_MAX_CTXTS) {
 257                 CDEBUG(D_WARNING, "%s: bad ctxt ID: idx=%d\n",
 258                        req->rq_export->exp_obd->obd_name, body->lgd_ctxt_idx);
 259                 RETURN(-EPROTO);
 260         }
 261
 262         ctxt = llog_get_context(req->rq_export->exp_obd, body->lgd_ctxt_idx);
 263         if (ctxt == NULL)
 264                 RETURN(-ENODEV);
 265
 266         rc = llog_open(req->rq_svc_thread->t_env, ctxt, &loghandle,
 267                        &body->lgd_logid, NULL, LLOG_OPEN_EXISTS);
 268         if (rc)
 269                 GOTO(out_ctxt, rc);
 270
 271         /*
 272          * llog_init_handle() reads the llog header
 273          */
 274         flags = body->lgd_llh_flags;
 275         rc = llog_init_handle(req->rq_svc_thread->t_env, loghandle, flags,
 276                               NULL);
 277         if (rc)
 278                 GOTO(out_close, rc);
 279         flags = loghandle->lgh_hdr->llh_flags;
 280
 281         hdr = req_capsule_server_get(&req->rq_pill, &RMF_LLOG_LOG_HDR);
 282         *hdr = *loghandle->lgh_hdr;
 283         EXIT;
 284 out_close:
 285         llog_origin_close(req->rq_svc_thread->t_env, loghandle);
 286 out_ctxt:
 287         llog_ctxt_put(ctxt);
 288         return rc;
 289 }