drivers/staging/lustre/lustre/obdclass/llog_cat.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) 2012, 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/obdclass/llog_cat.c
  33  *
  34  * OST<->MDS recovery logging infrastructure.
  35  *
  36  * Invariants in implementation:
  37  * - we do not share logs among different OST<->MDS connections, so that
  38  *   if an OST or MDS fails it need only look at log(s) relevant to itself
  39  *
  40  * Author: Andreas Dilger <adilger@clusterfs.com>
  41  * Author: Alexey Zhuravlev <alexey.zhuravlev@intel.com>
  42  * Author: Mikhail Pershin <mike.pershin@intel.com>
  43  */
  44
  45 #define DEBUG_SUBSYSTEM S_LOG
  46
  47 #include "../include/obd_class.h"
  48
  49 #include "llog_internal.h"
  50
  51 /* Open an existent log handle and add it to the open list.
  52  * This log handle will be closed when all of the records in it are removed.
  53  *
  54  * Assumes caller has already pushed us into the kernel context and is locking.
  55  * We return a lock on the handle to ensure nobody yanks it from us.
  56  *
  57  * This takes extra reference on llog_handle via llog_handle_get() and require
  58  * this reference to be put by caller using llog_handle_put()
  59  */
  60 static int llog_cat_id2handle(const struct lu_env *env,
  61                               struct llog_handle *cathandle,
  62                               struct llog_handle **res,
  63                               struct llog_logid *logid)
  64 {
  65         struct llog_handle      *loghandle;
  66         enum llog_flag fmt;
  67         int                      rc = 0;
  68
  69         if (!cathandle)
  70                 return -EBADF;
  71
  72         fmt = cathandle->lgh_hdr->llh_flags & LLOG_F_EXT_MASK;
  73         down_write(&cathandle->lgh_lock);
  74         list_for_each_entry(loghandle, &cathandle->u.chd.chd_head,
  75                             u.phd.phd_entry) {
  76                 struct llog_logid *cgl = &loghandle->lgh_id;
  77
  78                 if (ostid_id(&cgl->lgl_oi) == ostid_id(&logid->lgl_oi) &&
  79                     ostid_seq(&cgl->lgl_oi) == ostid_seq(&logid->lgl_oi)) {
  80                         if (cgl->lgl_ogen != logid->lgl_ogen) {
  81                                 CERROR("%s: log " DOSTID " generation %x != %x\n",
  82                                        loghandle->lgh_ctxt->loc_obd->obd_name,
  83                                        POSTID(&logid->lgl_oi), cgl->lgl_ogen,
  84                                        logid->lgl_ogen);
  85                                 continue;
  86                         }
  87                         loghandle->u.phd.phd_cat_handle = cathandle;
  88                         up_write(&cathandle->lgh_lock);
  89                         rc = 0;
  90                         goto out;
  91                 }
  92         }
  93         up_write(&cathandle->lgh_lock);
  94
  95         rc = llog_open(env, cathandle->lgh_ctxt, &loghandle, logid, NULL,
  96                        LLOG_OPEN_EXISTS);
  97         if (rc < 0) {
  98                 CERROR("%s: error opening log id " DOSTID ":%x: rc = %d\n",
  99                        cathandle->lgh_ctxt->loc_obd->obd_name,
 100                        POSTID(&logid->lgl_oi), logid->lgl_ogen, rc);
 101                 return rc;
 102         }
 103
 104         rc = llog_init_handle(env, loghandle, fmt | LLOG_F_IS_PLAIN, NULL);
 105         if (rc < 0) {
 106                 llog_close(env, loghandle);
 107                 loghandle = NULL;
 108                 return rc;
 109         }
 110
 111         down_write(&cathandle->lgh_lock);
 112         list_add_tail(&loghandle->u.phd.phd_entry, &cathandle->u.chd.chd_head);
 113         up_write(&cathandle->lgh_lock);
 114
 115         loghandle->u.phd.phd_cat_handle = cathandle;
 116         loghandle->u.phd.phd_cookie.lgc_lgl = cathandle->lgh_id;
 117         loghandle->u.phd.phd_cookie.lgc_index =
 118                                 loghandle->lgh_hdr->llh_cat_idx;
 119 out:
 120         llog_handle_get(loghandle);
 121         *res = loghandle;
 122         return 0;
 123 }
 124
 125 int llog_cat_close(const struct lu_env *env, struct llog_handle *cathandle)
 126 {
 127         struct llog_handle      *loghandle, *n;
 128
 129         list_for_each_entry_safe(loghandle, n, &cathandle->u.chd.chd_head,
 130                                  u.phd.phd_entry) {
 131                 /* unlink open-not-created llogs */
 132                 list_del_init(&loghandle->u.phd.phd_entry);
 133                 llog_close(env, loghandle);
 134         }
 135         /* if handle was stored in ctxt, remove it too */
 136         if (cathandle->lgh_ctxt->loc_handle == cathandle)
 137                 cathandle->lgh_ctxt->loc_handle = NULL;
 138         return llog_close(env, cathandle);
 139 }
 140 EXPORT_SYMBOL(llog_cat_close);
 141
 142 static int llog_cat_process_cb(const struct lu_env *env,
 143                                struct llog_handle *cat_llh,
 144                                struct llog_rec_hdr *rec, void *data)
 145 {
 146         struct llog_process_data *d = data;
 147         struct llog_logid_rec *lir = (struct llog_logid_rec *)rec;
 148         struct llog_handle *llh;
 149         int rc;
 150
 151         if (rec->lrh_type != LLOG_LOGID_MAGIC) {
 152                 CERROR("invalid record in catalog\n");
 153                 return -EINVAL;
 154         }
 155         CDEBUG(D_HA, "processing log " DOSTID ":%x at index %u of catalog "
 156                DOSTID "\n", POSTID(&lir->lid_id.lgl_oi), lir->lid_id.lgl_ogen,
 157                rec->lrh_index, POSTID(&cat_llh->lgh_id.lgl_oi));
 158
 159         rc = llog_cat_id2handle(env, cat_llh, &llh, &lir->lid_id);
 160         if (rc) {
 161                 CERROR("%s: cannot find handle for llog " DOSTID ": %d\n",
 162                        cat_llh->lgh_ctxt->loc_obd->obd_name,
 163                        POSTID(&lir->lid_id.lgl_oi), rc);
 164                 return rc;
 165         }
 166
 167         if (rec->lrh_index < d->lpd_startcat)
 168                 /* Skip processing of the logs until startcat */
 169                 rc = 0;
 170         else if (d->lpd_startidx > 0) {
 171                 struct llog_process_cat_data cd;
 172
 173                 cd.lpcd_first_idx = d->lpd_startidx;
 174                 cd.lpcd_last_idx = 0;
 175                 rc = llog_process_or_fork(env, llh, d->lpd_cb, d->lpd_data,
 176                                           &cd, false);
 177                 /* Continue processing the next log from idx 0 */
 178                 d->lpd_startidx = 0;
 179         } else {
 180                 rc = llog_process_or_fork(env, llh, d->lpd_cb, d->lpd_data,
 181                                           NULL, false);
 182         }
 183
 184         llog_handle_put(llh);
 185
 186         return rc;
 187 }
 188
 189 static int llog_cat_process_or_fork(const struct lu_env *env,
 190                                     struct llog_handle *cat_llh,
 191                                     llog_cb_t cb, void *data, int startcat,
 192                                     int startidx, bool fork)
 193 {
 194         struct llog_process_data d;
 195         struct llog_log_hdr *llh = cat_llh->lgh_hdr;
 196         int rc;
 197
 198         LASSERT(llh->llh_flags & LLOG_F_IS_CAT);
 199         d.lpd_data = data;
 200         d.lpd_cb = cb;
 201         d.lpd_startcat = startcat;
 202         d.lpd_startidx = startidx;
 203
 204         if (llh->llh_cat_idx > cat_llh->lgh_last_idx) {
 205                 struct llog_process_cat_data cd;
 206
 207                 CWARN("catlog " DOSTID " crosses index zero\n",
 208                       POSTID(&cat_llh->lgh_id.lgl_oi));
 209
 210                 cd.lpcd_first_idx = llh->llh_cat_idx;
 211                 cd.lpcd_last_idx = 0;
 212                 rc = llog_process_or_fork(env, cat_llh, llog_cat_process_cb,
 213                                           &d, &cd, fork);
 214                 if (rc != 0)
 215                         return rc;
 216
 217                 cd.lpcd_first_idx = 0;
 218                 cd.lpcd_last_idx = cat_llh->lgh_last_idx;
 219                 rc = llog_process_or_fork(env, cat_llh, llog_cat_process_cb,
 220                                           &d, &cd, fork);
 221         } else {
 222                 rc = llog_process_or_fork(env, cat_llh, llog_cat_process_cb,
 223                                           &d, NULL, fork);
 224         }
 225
 226         return rc;
 227 }
 228
 229 int llog_cat_process(const struct lu_env *env, struct llog_handle *cat_llh,
 230                      llog_cb_t cb, void *data, int startcat, int startidx)
 231 {
 232         return llog_cat_process_or_fork(env, cat_llh, cb, data, startcat,
 233                                         startidx, false);
 234 }
 235 EXPORT_SYMBOL(llog_cat_process);