sys/vfs/hammer2/hammer2_iocom.c

   1 /*
   2  * Copyright (c) 2011-2015 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  * by Daniel Flores (GSOC 2013 - mentored by Matthew Dillon, compression)
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/nlookup.h>
  39 #include <sys/vnode.h>
  40 #include <sys/mount.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/buf.h>
  43 #include <sys/uuid.h>
  44 #include <sys/vfsops.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/socket.h>
  47 #include <sys/objcache.h>
  48
  49 #include <sys/proc.h>
  50 #include <sys/namei.h>
  51 #include <sys/mountctl.h>
  52 #include <sys/dirent.h>
  53 #include <sys/uio.h>
  54
  55 #include <sys/mutex.h>
  56 #include <sys/mutex2.h>
  57
  58 #include "hammer2.h"
  59 #include "hammer2_disk.h"
  60 #include "hammer2_mount.h"
  61
  62 static int hammer2_rcvdmsg(kdmsg_msg_t *msg);
  63 static void hammer2_autodmsg(kdmsg_msg_t *msg);
  64 static int hammer2_lnk_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg);
  65
  66 void
  67 hammer2_iocom_init(hammer2_dev_t *hmp)
  68 {
  69         /*
  70          * Automatic LNK_CONN
  71          * Automatic LNK_SPAN handling
  72          * No automatic LNK_SPAN generation (we generate multiple spans
  73          *                                   ourselves).
  74          */
  75         kdmsg_iocom_init(&hmp->iocom, hmp,
  76                          KDMSG_IOCOMF_AUTOCONN |
  77                          KDMSG_IOCOMF_AUTORXSPAN,
  78                          hmp->mchain, hammer2_rcvdmsg);
  79 }
  80
  81 void
  82 hammer2_iocom_uninit(hammer2_dev_t *hmp)
  83 {
  84         /* XXX chain depend deadlck? */
  85         if (hmp->iocom.mmsg)
  86                 kdmsg_iocom_uninit(&hmp->iocom);
  87 }
  88
  89 /*
  90  * Reconnect using the passed file pointer.  The caller must ref the
  91  * fp for us.
  92  */
  93 void
  94 hammer2_cluster_reconnect(hammer2_dev_t *hmp, struct file *fp)
  95 {
  96         /*
  97          * Closes old comm descriptor, kills threads, cleans up
  98          * states, then installs the new descriptor and creates
  99          * new threads.
 100          */
 101         kdmsg_iocom_reconnect(&hmp->iocom, fp, "hammer2");
 102
 103         /*
 104          * Setup LNK_CONN fields for autoinitiated state machine.  LNK_CONN
 105          * does not have to be unique.  peer_id can be used to filter incoming
 106          * LNK_SPANs automatically if desired (though we still need to check).
 107          * peer_label typically identifies who we are and is not a filter.
 108          *
 109          * Since we will be initiating multiple LNK_SPANs we cannot use
 110          * AUTOTXSPAN, but we do use AUTORXSPAN so kdmsg tracks received
 111          * LNK_SPANs, and we simply monitor those messages.
 112          */
 113         bzero(&hmp->iocom.auto_lnk_conn.peer_id,
 114               sizeof(hmp->iocom.auto_lnk_conn.peer_id));
 115         /* hmp->iocom.auto_lnk_conn.peer_id = hmp->voldata.fsid; */
 116         hmp->iocom.auto_lnk_conn.proto_version = DMSG_SPAN_PROTO_1;
 117 #if 0
 118         hmp->iocom.auto_lnk_conn.peer_type = hmp->voldata.peer_type;
 119 #endif
 120         hmp->iocom.auto_lnk_conn.peer_type = DMSG_PEER_HAMMER2;
 121
 122         /*
 123          * We just want to receive LNK_SPANs related to HAMMER2 matching
 124          * peer_id.
 125          */
 126         hmp->iocom.auto_lnk_conn.peer_mask = 1LLU << DMSG_PEER_HAMMER2;
 127
 128 #if 0
 129         switch (ipdata->meta.pfs_type) {
 130         case DMSG_PFSTYPE_CLIENT:
 131                 hmp->iocom.auto_lnk_conn.peer_mask &=
 132                                 ~(1LLU << DMSG_PFSTYPE_CLIENT);
 133                 break;
 134         default:
 135                 break;
 136         }
 137 #endif
 138
 139         bzero(&hmp->iocom.auto_lnk_conn.peer_label,
 140               sizeof(hmp->iocom.auto_lnk_conn.peer_label));
 141         ksnprintf(hmp->iocom.auto_lnk_conn.peer_label,
 142                   sizeof(hmp->iocom.auto_lnk_conn.peer_label),
 143                   "%s/%s",
 144                   hostname, "hammer2-mount");
 145         kdmsg_iocom_autoinitiate(&hmp->iocom, hammer2_autodmsg);
 146 }
 147
 148 static int
 149 hammer2_rcvdmsg(kdmsg_msg_t *msg)
 150 {
 151         kprintf("RCVMSG %08x\n", msg->tcmd);
 152
 153         switch(msg->tcmd) {
 154         case DMSG_DBG_SHELL:
 155                 /*
 156                  * (non-transaction)
 157                  * Execute shell command (not supported atm)
 158                  */
 159                 kdmsg_msg_result(msg, DMSG_ERR_NOSUPP);
 160                 break;
 161         case DMSG_DBG_SHELL | DMSGF_REPLY:
 162                 /*
 163                  * (non-transaction)
 164                  */
 165                 if (msg->aux_data) {
 166                         msg->aux_data[msg->aux_size - 1] = 0;
 167                         kprintf("HAMMER2 DBG: %s\n", msg->aux_data);
 168                 }
 169                 break;
 170         default:
 171                 /*
 172                  * Unsupported message received.  We only need to
 173                  * reply if it's a transaction in order to close our end.
 174                  * Ignore any one-way messages or any further messages
 175                  * associated with the transaction.
 176                  *
 177                  * NOTE: This case also includes DMSG_LNK_ERROR messages
 178                  *       which might be one-way, replying to those would
 179                  *       cause an infinite ping-pong.
 180                  */
 181                 if (msg->any.head.cmd & DMSGF_CREATE)
 182                         kdmsg_msg_reply(msg, DMSG_ERR_NOSUPP);
 183                 break;
 184         }
 185         return(0);
 186 }
 187
 188 /*
 189  * This function is called after KDMSG has automatically handled processing
 190  * of a LNK layer message (typically CONN or SPAN).
 191  *
 192  * We tag off the LNK_CONN to trigger our LNK_VOLCONF messages which
 193  * advertises all available hammer2 super-root volumes.
 194  *
 195  * We collect span state
 196  */
 197 static void hammer2_update_spans(hammer2_dev_t *hmp, kdmsg_state_t *state);
 198
 199 static void
 200 hammer2_autodmsg(kdmsg_msg_t *msg)
 201 {
 202         hammer2_dev_t *hmp = msg->state->iocom->handle;
 203         int copyid;
 204
 205         switch(msg->tcmd) {
 206         case DMSG_LNK_CONN | DMSGF_CREATE:
 207         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_DELETE:
 208         case DMSG_LNK_CONN | DMSGF_DELETE:
 209                 /*
 210                  * NOTE: kern_dmsg will automatically issue a result,
 211                  *       leaving the transaction open, for CREATEs,
 212                  *       and will automatically issue a terminating reply
 213                  *       for DELETEs.
 214                  */
 215                 break;
 216         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_REPLY:
 217         case DMSG_LNK_CONN | DMSGF_CREATE | DMSGF_DELETE | DMSGF_REPLY:
 218                 /*
 219                  * Do a volume configuration dump when we receive a reply
 220                  * to our auto-CONN (typically leaving the transaction open).
 221                  */
 222                 if (msg->any.head.cmd & DMSGF_CREATE) {
 223                         kprintf("HAMMER2: VOLDATA DUMP\n");
 224
 225                         /*
 226                          * Dump the configuration stored in the volume header.
 227                          * This will typically be import/export access rights,
 228                          * master encryption keys (encrypted), etc.
 229                          */
 230                         hammer2_voldata_lock(hmp);
 231                         copyid = 0;
 232                         while (copyid < HAMMER2_COPYID_COUNT) {
 233                                 if (hmp->voldata.copyinfo[copyid].copyid)
 234                                         hammer2_volconf_update(hmp, copyid);
 235                                 ++copyid;
 236                         }
 237                         hammer2_voldata_unlock(hmp);
 238
 239                         kprintf("HAMMER2: INITIATE SPANs\n");
 240                         hammer2_update_spans(hmp, msg->state);
 241                 }
 242                 if ((msg->any.head.cmd & DMSGF_DELETE) &&
 243                     msg->state && (msg->state->txcmd & DMSGF_DELETE) == 0) {
 244                         kprintf("HAMMER2: CONN WAS TERMINATED\n");
 245                 }
 246                 break;
 247         case DMSG_LNK_SPAN | DMSGF_CREATE:
 248                 /*
 249                  * Monitor SPANs and issue a result, leaving the SPAN open
 250                  * if it is something we can use now or in the future.
 251                  */
 252                 if (msg->any.lnk_span.peer_type != DMSG_PEER_HAMMER2) {
 253                         kdmsg_msg_reply(msg, 0);
 254                         break;
 255                 }
 256                 if (msg->any.lnk_span.proto_version != DMSG_SPAN_PROTO_1) {
 257                         kdmsg_msg_reply(msg, 0);
 258                         break;
 259                 }
 260                 DMSG_TERMINATE_STRING(msg->any.lnk_span.peer_label);
 261                 if (hammer2_debug & 0x0100) {
 262                         kprintf("H2 +RXSPAN cmd=%08x (%-20s) cl=",
 263                                 msg->any.head.cmd,
 264                                 msg->any.lnk_span.peer_label);
 265                         printf_uuid(&msg->any.lnk_span.peer_id);
 266                         kprintf(" fs=");
 267                         printf_uuid(&msg->any.lnk_span.pfs_id);
 268                         kprintf(" type=%d\n", msg->any.lnk_span.pfs_type);
 269                 }
 270                 kdmsg_msg_result(msg, 0);
 271                 break;
 272         case DMSG_LNK_SPAN | DMSGF_DELETE:
 273                 /*
 274                  * NOTE: kern_dmsg will automatically reply to DELETEs.
 275                  */
 276                 if (hammer2_debug & 0x0100)
 277                         kprintf("H2 -RXSPAN\n");
 278                 break;
 279         default:
 280                 break;
 281         }
 282 }
 283
 284 /*
 285  * Update LNK_SPAN state
 286  */
 287 static void
 288 hammer2_update_spans(hammer2_dev_t *hmp, kdmsg_state_t *state)
 289 {
 290         const hammer2_inode_data_t *ripdata;
 291         hammer2_chain_t *parent;
 292         hammer2_chain_t *chain;
 293         hammer2_pfs_t *spmp;
 294         hammer2_key_t key_next;
 295         kdmsg_msg_t *rmsg;
 296         size_t name_len;
 297         int error;
 298
 299         /*
 300          * Lookup mount point under the media-localized super-root.
 301          *
 302          * cluster->pmp will incorrectly point to spmp and must be fixed
 303          * up later on.
 304          */
 305         spmp = hmp->spmp;
 306         hammer2_inode_lock(spmp->iroot, 0);
 307         error = 0;
 308
 309         parent = hammer2_inode_chain(spmp->iroot, 0, HAMMER2_RESOLVE_ALWAYS);
 310         chain = NULL;
 311         if (parent == NULL)
 312                 goto done;
 313         chain = hammer2_chain_lookup(&parent, &key_next,
 314                                      HAMMER2_KEY_MIN, HAMMER2_KEY_MAX,
 315                                      &error, 0);
 316         while (chain) {
 317                 if (chain->bref.type != HAMMER2_BREF_TYPE_INODE)
 318                         continue;
 319                 ripdata = &chain->data->ipdata;
 320                 kprintf("UPDATE SPANS: %s\n", ripdata->filename);
 321
 322                 rmsg = kdmsg_msg_alloc(&hmp->iocom.state0,
 323                                        DMSG_LNK_SPAN | DMSGF_CREATE,
 324                                        hammer2_lnk_span_reply, NULL);
 325                 rmsg->any.lnk_span.peer_id = ripdata->meta.pfs_clid;
 326                 rmsg->any.lnk_span.pfs_id = ripdata->meta.pfs_fsid;
 327                 rmsg->any.lnk_span.pfs_type = ripdata->meta.pfs_type;
 328                 rmsg->any.lnk_span.peer_type = DMSG_PEER_HAMMER2;
 329                 rmsg->any.lnk_span.proto_version = DMSG_SPAN_PROTO_1;
 330                 name_len = ripdata->meta.name_len;
 331                 if (name_len >= sizeof(rmsg->any.lnk_span.peer_label))
 332                         name_len = sizeof(rmsg->any.lnk_span.peer_label) - 1;
 333                 bcopy(ripdata->filename,
 334                       rmsg->any.lnk_span.peer_label,
 335                       name_len);
 336
 337                 kdmsg_msg_write(rmsg);
 338
 339                 chain = hammer2_chain_next(&parent, chain, &key_next,
 340                                                key_next, HAMMER2_KEY_MAX,
 341                                                &error, 0);
 342         }
 343         hammer2_inode_unlock(spmp->iroot);
 344         error = hammer2_error_to_errno(error);
 345         /* XXX do something with error */
 346 done:
 347         if (chain) {
 348                 hammer2_chain_unlock(chain);
 349                 hammer2_chain_drop(chain);
 350         }
 351         if (parent) {
 352                 hammer2_chain_unlock(parent);
 353                 hammer2_chain_drop(parent);
 354         }
 355 }
 356
 357 static
 358 int
 359 hammer2_lnk_span_reply(kdmsg_state_t *state, kdmsg_msg_t *msg)
 360 {
 361         if ((state->txcmd & DMSGF_DELETE) == 0 &&
 362             (msg->any.head.cmd & DMSGF_DELETE)) {
 363                 kdmsg_msg_reply(msg, 0);
 364         }
 365         return 0;
 366 }
 367
 368 /*
 369  * Volume configuration updates are passed onto the userland service
 370  * daemon via the open LNK_CONN transaction.
 371  */
 372 void
 373 hammer2_volconf_update(hammer2_dev_t *hmp, int index)
 374 {
 375         kdmsg_msg_t *msg;
 376
 377         /* XXX interlock against connection state termination */
 378         kprintf("volconf update %p\n", hmp->iocom.conn_state);
 379         if (hmp->iocom.conn_state) {
 380                 kprintf("TRANSMIT VOLCONF VIA OPEN CONN TRANSACTION\n");
 381                 msg = kdmsg_msg_alloc(hmp->iocom.conn_state,
 382                                       DMSG_LNK_HAMMER2_VOLCONF,
 383                                       NULL, NULL);
 384                 H2_LNK_VOLCONF(msg)->copy = hmp->voldata.copyinfo[index];
 385                 H2_LNK_VOLCONF(msg)->mediaid = hmp->voldata.fsid;
 386                 H2_LNK_VOLCONF(msg)->index = index;
 387                 kdmsg_msg_write(msg);
 388         }
 389 }