lustre/mdt/mdt_capa.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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/mdt/mdt_capa.c
  37  *
  38  * Lustre Metadata Target (mdt) capability key read/write/update.
  39  *
  40  * Author: Lai Siyao <lsy@clusterfs.com>
  41  */
  42
  43 #define DEBUG_SUBSYSTEM S_MDS
  44
  45 #include "mdt_internal.h"
  46
  47 static inline void set_capa_key_expiry(struct mdt_device *mdt)
  48 {
  49         mdt->mdt_ck_expiry = jiffies + mdt->mdt_ck_timeout * CFS_HZ;
  50 }
  51
  52 static void make_capa_key(struct lustre_capa_key *key,
  53                           mdsno_t mdsnum, int keyid)
  54 {
  55         key->lk_seq = mdsnum;
  56         key->lk_keyid = keyid + 1;
  57         cfs_get_random_bytes(key->lk_key, sizeof(key->lk_key));
  58 }
  59
  60 static inline void lck_cpu_to_le(struct lustre_capa_key *tgt,
  61                                  struct lustre_capa_key *src)
  62 {
  63         tgt->lk_seq   = cpu_to_le64(src->lk_seq);
  64         tgt->lk_keyid   = cpu_to_le32(src->lk_keyid);
  65         tgt->lk_padding = cpu_to_le32(src->lk_padding);
  66         memcpy(tgt->lk_key, src->lk_key, sizeof(src->lk_key));
  67 }
  68
  69 static inline void lck_le_to_cpu(struct lustre_capa_key *tgt,
  70                                  struct lustre_capa_key *src)
  71 {
  72         tgt->lk_seq   = le64_to_cpu(src->lk_seq);
  73         tgt->lk_keyid   = le32_to_cpu(src->lk_keyid);
  74         tgt->lk_padding = le32_to_cpu(src->lk_padding);
  75         memcpy(tgt->lk_key, src->lk_key, sizeof(src->lk_key));
  76 }
  77
  78 static int write_capa_keys(const struct lu_env *env,
  79                            struct mdt_device *mdt,
  80                            struct lustre_capa_key *keys)
  81 {
  82         struct mdt_thread_info *mti;
  83         struct lustre_capa_key *tmp;
  84         struct thandle *th;
  85         loff_t off = 0;
  86         int i, rc;
  87
  88         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  89         th = dt_trans_create(env, mdt->mdt_bottom);
  90         if (IS_ERR(th))
  91                 RETURN(PTR_ERR(th));
  92
  93         rc = dt_declare_record_write(env, mdt->mdt_ck_obj,
  94                                      sizeof(*tmp) * 3, 0, th);
  95         if (rc)
  96                 goto stop;
  97
  98         rc = dt_trans_start_local(env, mdt->mdt_bottom, th);
  99         if (rc)
 100                 goto stop;
 101
 102         tmp = &mti->mti_capa_key;
 103
 104         for (i = 0; i < 2; i++) {
 105                 lck_cpu_to_le(tmp, &keys[i]);
 106
 107                 rc = dt_record_write(env, mdt->mdt_ck_obj,
 108                                      mdt_buf_const(env, tmp, sizeof(*tmp)),
 109                                      &off, th);
 110                 if (rc)
 111                         break;
 112         }
 113
 114 stop:
 115         dt_trans_stop(env, mdt->mdt_bottom, th);
 116
 117         CDEBUG(D_INFO, "write capability keys rc = %d:\n", rc);
 118         return rc;
 119 }
 120
 121 static int read_capa_keys(const struct lu_env *env,
 122                           struct mdt_device *mdt,
 123                           struct lustre_capa_key *keys)
 124 {
 125         struct mdt_thread_info *mti;
 126         struct lustre_capa_key *tmp;
 127         loff_t off = 0;
 128         int i, rc;
 129
 130         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 131         tmp = &mti->mti_capa_key;
 132
 133         for (i = 0; i < 2; i++) {
 134                 rc = dt_record_read(env, mdt->mdt_ck_obj,
 135                                     mdt_buf(env, tmp, sizeof(*tmp)), &off);
 136                 if (rc)
 137                         return rc;
 138
 139                 lck_le_to_cpu(&keys[i], tmp);
 140                 DEBUG_CAPA_KEY(D_SEC, &keys[i], "read");
 141         }
 142
 143         return 0;
 144 }
 145
 146 int mdt_capa_keys_init(const struct lu_env *env, struct mdt_device *mdt)
 147 {
 148         struct lustre_capa_key  *keys = mdt->mdt_capa_keys;
 149         struct mdt_thread_info  *mti;
 150         struct dt_object        *obj;
 151         struct lu_attr          *la;
 152         mdsno_t                  mdsnum;
 153         unsigned long            size;
 154         int                      rc;
 155         ENTRY;
 156
 157         mdsnum = mdt_seq_site(mdt)->ss_node_id;
 158
 159         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 160         LASSERT(mti != NULL);
 161         la = &mti->mti_attr.ma_attr;
 162
 163         obj = mdt->mdt_ck_obj;
 164         rc = obj->do_ops->do_attr_get(env, mdt->mdt_ck_obj, la, BYPASS_CAPA);
 165         if (rc)
 166                 RETURN(rc);
 167
 168         size = (unsigned long)la->la_size;
 169         if (size == 0) {
 170                 int i;
 171
 172                 for (i = 0; i < 2; i++) {
 173                         make_capa_key(&keys[i], mdsnum, i);
 174                         DEBUG_CAPA_KEY(D_SEC, &keys[i], "initializing");
 175                 }
 176
 177                 rc = write_capa_keys(env, mdt, keys);
 178                 if (rc) {
 179                         CERROR("error writing MDS %s: rc %d\n", CAPA_KEYS, rc);
 180                         RETURN(rc);
 181                 }
 182         } else {
 183                 rc = read_capa_keys(env, mdt, keys);
 184                 if (rc) {
 185                         CERROR("error reading MDS %s: rc %d\n", CAPA_KEYS, rc);
 186                         RETURN(rc);
 187                 }
 188         }
 189         set_capa_key_expiry(mdt);
 190         cfs_timer_arm(&mdt->mdt_ck_timer, mdt->mdt_ck_expiry);
 191         CDEBUG(D_SEC, "mds_ck_timer %lu\n", mdt->mdt_ck_expiry);
 192         RETURN(0);
 193 }
 194
 195 void mdt_ck_timer_callback(unsigned long castmeharder)
 196 {
 197         struct mdt_device *mdt = (struct mdt_device *)castmeharder;
 198         struct ptlrpc_thread *thread = &mdt->mdt_ck_thread;
 199
 200         ENTRY;
 201         thread_add_flags(thread, SVC_EVENT);
 202         cfs_waitq_signal(&thread->t_ctl_waitq);
 203         EXIT;
 204 }
 205
 206 static int mdt_ck_thread_main(void *args)
 207 {
 208         struct mdt_device      *mdt = args;
 209         struct ptlrpc_thread   *thread = &mdt->mdt_ck_thread;
 210         struct lustre_capa_key *bkey = &mdt->mdt_capa_keys[0],
 211                                *rkey = &mdt->mdt_capa_keys[1];
 212         struct lustre_capa_key *tmp;
 213         struct lu_env           env;
 214         struct mdt_thread_info *info;
 215         struct md_device       *next;
 216         struct l_wait_info      lwi = { 0 };
 217         mdsno_t                 mdsnum;
 218         int                     rc;
 219         ENTRY;
 220
 221         cfs_daemonize_ctxt("mdt_ck");
 222         cfs_block_allsigs();
 223
 224         thread_set_flags(thread, SVC_RUNNING);
 225         cfs_waitq_signal(&thread->t_ctl_waitq);
 226
 227         rc = lu_env_init(&env, LCT_MD_THREAD|LCT_REMEMBER|LCT_NOREF);
 228         if (rc)
 229                 RETURN(rc);
 230
 231         thread->t_env = &env;
 232         env.le_ctx.lc_thread = thread;
 233         env.le_ctx.lc_cookie = 0x1;
 234
 235         info = lu_context_key_get(&env.le_ctx, &mdt_thread_key);
 236         LASSERT(info != NULL);
 237
 238         tmp = &info->mti_capa_key;
 239         mdsnum = mdt_seq_site(mdt)->ss_node_id;
 240         while (1) {
 241                 l_wait_event(thread->t_ctl_waitq,
 242                              thread_is_stopping(thread) ||
 243                              thread_is_event(thread),
 244                              &lwi);
 245
 246                 if (thread_is_stopping(thread))
 247                         break;
 248                 thread_clear_flags(thread, SVC_EVENT);
 249
 250                 if (cfs_time_before(cfs_time_current(), mdt->mdt_ck_expiry))
 251                         break;
 252
 253                 *tmp = *rkey;
 254                 make_capa_key(tmp, mdsnum, rkey->lk_keyid);
 255
 256                 next = mdt->mdt_child;
 257                 rc = next->md_ops->mdo_update_capa_key(&env, next, tmp);
 258                 if (!rc) {
 259                         spin_lock(&capa_lock);
 260                         *bkey = *rkey;
 261                         *rkey = *tmp;
 262                         spin_unlock(&capa_lock);
 263
 264                         rc = write_capa_keys(&env, mdt, mdt->mdt_capa_keys);
 265                         if (rc) {
 266                                 spin_lock(&capa_lock);
 267                                 *rkey = *bkey;
 268                                 memset(bkey, 0, sizeof(*bkey));
 269                                 spin_unlock(&capa_lock);
 270                         } else {
 271                                 set_capa_key_expiry(mdt);
 272                                 DEBUG_CAPA_KEY(D_SEC, rkey, "new");
 273                         }
 274                 }
 275                 if (rc) {
 276                         DEBUG_CAPA_KEY(D_ERROR, rkey, "update failed for");
 277                         /* next retry is in 300 sec */
 278                         mdt->mdt_ck_expiry = jiffies + 300 * CFS_HZ;
 279                 }
 280
 281                 cfs_timer_arm(&mdt->mdt_ck_timer, mdt->mdt_ck_expiry);
 282                 CDEBUG(D_SEC, "mdt_ck_timer %lu\n", mdt->mdt_ck_expiry);
 283         }
 284         lu_env_fini(&env);
 285
 286         thread_set_flags(thread, SVC_STOPPED);
 287         cfs_waitq_signal(&thread->t_ctl_waitq);
 288         RETURN(0);
 289 }
 290
 291 int mdt_ck_thread_start(struct mdt_device *mdt)
 292 {
 293         struct ptlrpc_thread *thread = &mdt->mdt_ck_thread;
 294         int rc;
 295
 296         cfs_waitq_init(&thread->t_ctl_waitq);
 297         rc = cfs_create_thread(mdt_ck_thread_main, mdt, CFS_DAEMON_FLAGS);
 298         if (rc < 0) {
 299                 CERROR("cannot start mdt_ck thread, rc = %d\n", rc);
 300                 return rc;
 301         }
 302
 303         l_wait_condition(thread->t_ctl_waitq, thread_is_running(thread));
 304         return 0;
 305 }
 306
 307 void mdt_ck_thread_stop(struct mdt_device *mdt)
 308 {
 309         struct ptlrpc_thread *thread = &mdt->mdt_ck_thread;
 310
 311         if (!thread_is_running(thread))
 312                 return;
 313
 314         thread_set_flags(thread, SVC_STOPPING);
 315         cfs_waitq_signal(&thread->t_ctl_waitq);
 316         l_wait_condition(thread->t_ctl_waitq, thread_is_stopped(thread));
 317 }