sbin/hammer/cmd_mirror.c

   1 /*
   2  * Copyright (c) 2008 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  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "hammer.h"
  36
  37 #define LINE1   0,20
  38 #define LINE2   20,78
  39 #define LINE3   90,70
  40
  41 #define SERIALBUF_SIZE  (512 * 1024)
  42
  43 typedef struct histogram {
  44         hammer_tid_t    tid;
  45         uint64_t        bytes;
  46 } *histogram_t;
  47
  48 const char *ScoreBoardFile;
  49 const char *RestrictTarget;
  50
  51 static int read_mrecords(int fd, char *buf, u_int size,
  52                          hammer_ioc_mrecord_head_t pickup);
  53 static int generate_histogram(int fd, const char *filesystem,
  54                          histogram_t *histogram_ary,
  55                          struct hammer_ioc_mirror_rw *mirror_base,
  56                          int *repeatp);
  57 static hammer_ioc_mrecord_any_t read_mrecord(int fdin, int *errorp,
  58                          hammer_ioc_mrecord_head_t pickup);
  59 static void write_mrecord(int fdout, uint32_t type,
  60                          hammer_ioc_mrecord_any_t mrec, int bytes);
  61 static void generate_mrec_header(int fd, int pfs_id,
  62                          union hammer_ioc_mrecord_any *mrec_tmp);
  63 static int validate_mrec_header(int fd, int fdin, int is_target, int pfs_id,
  64                          struct hammer_ioc_mrecord_head *pickup,
  65                          hammer_tid_t *tid_begp, hammer_tid_t *tid_endp);
  66 static void update_pfs_snapshot(int fd, hammer_tid_t snapshot_tid, int pfs_id);
  67 static ssize_t writebw(int fd, const void *buf, size_t nbytes,
  68                         uint64_t *bwcount, struct timeval *tv1);
  69 static int getyntty(void);
  70 static void score_printf(size_t i, size_t w, const char *ctl, ...);
  71 static void hammer_check_restrict(const char *filesystem);
  72 static void mirror_usage(int code);
  73
  74 /*
  75  * Generate a mirroring data stream from the specific source over the
  76  * entire key range, but restricted to the specified transaction range.
  77  *
  78  * The HAMMER VFS does most of the work, we add a few new mrecord
  79  * types to negotiate the TID ranges and verify that the entire
  80  * stream made it to the destination.
  81  *
  82  * streaming will be 0 for mirror-read, 1 for mirror-stream.  The code will
  83  * set up a fake value of -1 when running the histogram for mirror-read.
  84  */
  85 void
  86 hammer_cmd_mirror_read(char **av, int ac, int streaming)
  87 {
  88         struct hammer_ioc_mirror_rw mirror;
  89         struct hammer_ioc_pseudofs_rw pfs;
  90         union hammer_ioc_mrecord_any mrec_tmp;
  91         struct hammer_ioc_mrecord_head pickup;
  92         hammer_ioc_mrecord_any_t mrec;
  93         hammer_tid_t sync_tid;
  94         histogram_t histogram_ary;
  95         const char *filesystem;
  96         char *buf = malloc(SERIALBUF_SIZE);
  97         int interrupted = 0;
  98         int error;
  99         int fd;
 100         int n;
 101         int didwork;
 102         int histogram;
 103         int histindex;
 104         int histmax;
 105         int repeat = 0;
 106         int sameline;
 107         int64_t total_bytes;
 108         time_t base_t = time(NULL);
 109         struct timeval bwtv;
 110         uint64_t bwcount;
 111         uint64_t estbytes;
 112
 113         if (ac == 0 || ac > 2)
 114                 mirror_usage(1);
 115         filesystem = av[0];
 116         hammer_check_restrict(filesystem);
 117
 118         pickup.signature = 0;
 119         pickup.type = 0;
 120         histogram = 0;
 121         histindex = 0;
 122         histmax = 0;
 123         histogram_ary = NULL;
 124         sameline = 0;
 125
 126 again:
 127         bzero(&mirror, sizeof(mirror));
 128         hammer_key_beg_init(&mirror.key_beg);
 129         hammer_key_end_init(&mirror.key_end);
 130
 131         fd = getpfs(&pfs, filesystem);
 132
 133         if (streaming >= 0)
 134                 score_printf(LINE1, "Running");
 135
 136         if (streaming >= 0 && VerboseOpt && VerboseOpt < 2) {
 137                 fprintf(stderr, "%cRunning  \b\b", (sameline ? '\r' : '\n'));
 138                 fflush(stderr);
 139                 sameline = 1;
 140         }
 141         sameline = 1;
 142         total_bytes = 0;
 143         gettimeofday(&bwtv, NULL);
 144         bwcount = 0;
 145
 146         /*
 147          * Send initial header for the purpose of determining the
 148          * shared-uuid.
 149          */
 150         generate_mrec_header(fd, pfs.pfs_id, &mrec_tmp);
 151         write_mrecord(1, HAMMER_MREC_TYPE_PFSD,
 152                       &mrec_tmp, sizeof(mrec_tmp.pfs));
 153
 154         /*
 155          * In 2-way mode the target will send us a PFS info packet
 156          * first.  Use the target's current snapshot TID as our default
 157          * begin TID.
 158          */
 159         if (TwoWayPipeOpt) {
 160                 mirror.tid_beg = 0;
 161                 n = validate_mrec_header(fd, 0, 0, pfs.pfs_id, &pickup,
 162                                          NULL, &mirror.tid_beg);
 163                 if (n < 0) {    /* got TERM record */
 164                         relpfs(fd, &pfs);
 165                         free(buf);
 166                         free(histogram_ary);
 167                         return;
 168                 }
 169                 ++mirror.tid_beg;
 170         } else if (streaming && histogram) {
 171                 mirror.tid_beg = histogram_ary[histindex].tid + 1;
 172         } else {
 173                 mirror.tid_beg = 0;
 174         }
 175
 176         /*
 177          * Write out the PFS header, tid_beg will be updated if our PFS
 178          * has a larger begin sync.  tid_end is set to the latest source
 179          * TID whos flush cycle has completed.
 180          */
 181         generate_mrec_header(fd, pfs.pfs_id, &mrec_tmp);
 182         if (mirror.tid_beg < mrec_tmp.pfs.pfsd.sync_beg_tid)
 183                 mirror.tid_beg = mrec_tmp.pfs.pfsd.sync_beg_tid;
 184         mirror.tid_end = mrec_tmp.pfs.pfsd.sync_end_tid;
 185         mirror.ubuf = buf;
 186         mirror.size = SERIALBUF_SIZE;
 187         mirror.pfs_id = pfs.pfs_id;
 188         mirror.shared_uuid = pfs.ondisk->shared_uuid;
 189
 190         /*
 191          * XXX If the histogram is exhausted and the TID delta is large
 192          *     the stream might have been offline for a while and is
 193          *     now picking it up again.  Do another histogram.
 194          */
 195 #if 0
 196         if (streaming && histogram && histindex == histend) {
 197                 if (mirror.tid_end - mirror.tid_beg > BULK_MINIMUM)
 198                         histogram = 0;
 199         }
 200 #endif
 201
 202         /*
 203          * Initial bulk startup control, try to do some incremental
 204          * mirroring in order to allow the stream to be killed and
 205          * restarted without having to start over.
 206          */
 207         if (histogram == 0 && BulkOpt == 0) {
 208                 if (VerboseOpt && repeat == 0) {
 209                         fprintf(stderr, "\n");
 210                         sameline = 0;
 211                 }
 212                 histmax = generate_histogram(fd, filesystem,
 213                                              &histogram_ary, &mirror,
 214                                              &repeat);
 215                 histindex = 0;
 216                 histogram = 1;
 217
 218                 /*
 219                  * Just stream the histogram, then stop
 220                  */
 221                 if (streaming == 0)
 222                         streaming = -1;
 223         }
 224
 225         if (streaming && histogram) {
 226                 ++histindex;
 227                 mirror.tid_end = histogram_ary[histindex].tid;
 228                 estbytes = histogram_ary[histindex-1].bytes;
 229                 mrec_tmp.pfs.pfsd.sync_end_tid = mirror.tid_end;
 230         } else {
 231                 estbytes = 0;
 232         }
 233
 234         write_mrecord(1, HAMMER_MREC_TYPE_PFSD,
 235                       &mrec_tmp, sizeof(mrec_tmp.pfs));
 236
 237         /*
 238          * A cycle file overrides the beginning TID only if we are
 239          * not operating in two-way or histogram mode.
 240          */
 241         if (TwoWayPipeOpt == 0 && histogram == 0)
 242                 hammer_get_cycle(&mirror.key_beg, &mirror.tid_beg);
 243
 244         /*
 245          * An additional argument overrides the beginning TID regardless
 246          * of what mode we are in.  This is not recommending if operating
 247          * in two-way mode.
 248          */
 249         if (ac == 2)
 250                 mirror.tid_beg = strtoull(av[1], NULL, 0);
 251
 252         if (streaming == 0 || VerboseOpt >= 2) {
 253                 fprintf(stderr,
 254                         "Mirror-read: Mirror %016jx to %016jx",
 255                         (uintmax_t)mirror.tid_beg, (uintmax_t)mirror.tid_end);
 256                 if (histogram)
 257                         fprintf(stderr, " (bulk= %ju)", (uintmax_t)estbytes);
 258                 fprintf(stderr, "\n");
 259                 fflush(stderr);
 260         }
 261         if (mirror.key_beg.obj_id != (int64_t)HAMMER_MIN_OBJID) {
 262                 fprintf(stderr, "Mirror-read: Resuming at object %016jx\n",
 263                         (uintmax_t)mirror.key_beg.obj_id);
 264         }
 265
 266         /*
 267          * Nothing to do if begin equals end.
 268          */
 269         if (mirror.tid_beg >= mirror.tid_end) {
 270                 if (streaming == 0 || VerboseOpt >= 2)
 271                         fprintf(stderr, "Mirror-read: No work to do\n");
 272                 sleep(DelayOpt);
 273                 didwork = 0;
 274                 histogram = 0;
 275                 goto done;
 276         }
 277         didwork = 1;
 278
 279         /*
 280          * Write out bulk records
 281          */
 282         mirror.ubuf = buf;
 283         mirror.size = SERIALBUF_SIZE;
 284
 285         do {
 286                 mirror.count = 0;
 287                 mirror.pfs_id = pfs.pfs_id;
 288                 mirror.shared_uuid = pfs.ondisk->shared_uuid;
 289                 if (ioctl(fd, HAMMERIOC_MIRROR_READ, &mirror) < 0) {
 290                         score_printf(LINE3, "Mirror-read %s failed: %s",
 291                                      filesystem, strerror(errno));
 292                         err(1, "Mirror-read %s failed", filesystem);
 293                 }
 294                 if (mirror.head.flags & HAMMER_IOC_HEAD_ERROR) {
 295                         score_printf(LINE3, "Mirror-read %s fatal error %d",
 296                                      filesystem, mirror.head.error);
 297                         errx(1, "Mirror-read %s fatal error %d",
 298                                 filesystem, mirror.head.error);
 299                 }
 300                 if (mirror.count) {
 301                         if (BandwidthOpt) {
 302                                 n = writebw(1, mirror.ubuf, mirror.count,
 303                                             &bwcount, &bwtv);
 304                         } else {
 305                                 n = write(1, mirror.ubuf, mirror.count);
 306                         }
 307                         if (n != mirror.count) {
 308                                 score_printf(LINE3,
 309                                              "Mirror-read %s failed: "
 310                                              "short write",
 311                                              filesystem);
 312                                 errx(1, "Mirror-read %s failed: short write",
 313                                         filesystem);
 314                         }
 315                 }
 316                 total_bytes += mirror.count;
 317                 if (streaming && VerboseOpt) {
 318                         fprintf(stderr,
 319                                 "\rscan obj=%016jx tids=%016jx:%016jx %11jd",
 320                                 (uintmax_t)mirror.key_cur.obj_id,
 321                                 (uintmax_t)mirror.tid_beg,
 322                                 (uintmax_t)mirror.tid_end,
 323                                 (intmax_t)total_bytes);
 324                         fflush(stderr);
 325                         sameline = 0;
 326                 } else if (streaming) {
 327                         score_printf(LINE2,
 328                                 "obj=%016jx tids=%016jx:%016jx %11jd",
 329                                 (uintmax_t)mirror.key_cur.obj_id,
 330                                 (uintmax_t)mirror.tid_beg,
 331                                 (uintmax_t)mirror.tid_end,
 332                                 (intmax_t)total_bytes);
 333                 }
 334                 mirror.key_beg = mirror.key_cur;
 335
 336                 /*
 337                  * Deal with time limit option
 338                  */
 339                 if (TimeoutOpt &&
 340                     (unsigned)(time(NULL) - base_t) > (unsigned)TimeoutOpt) {
 341                         score_printf(LINE3,
 342                                 "Mirror-read %s interrupted by timer at"
 343                                 " %016jx",
 344                                 filesystem,
 345                                 (uintmax_t)mirror.key_cur.obj_id);
 346                         fprintf(stderr,
 347                                 "Mirror-read %s interrupted by timer at"
 348                                 " %016jx\n",
 349                                 filesystem,
 350                                 (uintmax_t)mirror.key_cur.obj_id);
 351                         interrupted = 1;
 352                         break;
 353                 }
 354         } while (mirror.count != 0);
 355
 356 done:
 357         if (streaming && VerboseOpt && sameline == 0) {
 358                 fprintf(stderr, "\n");
 359                 fflush(stderr);
 360                 sameline = 1;
 361         }
 362
 363         /*
 364          * Write out the termination sync record - only if not interrupted
 365          */
 366         if (interrupted == 0) {
 367                 if (didwork) {
 368                         write_mrecord(1, HAMMER_MREC_TYPE_SYNC,
 369                                       &mrec_tmp, sizeof(mrec_tmp.sync));
 370                 } else {
 371                         write_mrecord(1, HAMMER_MREC_TYPE_IDLE,
 372                                       &mrec_tmp, sizeof(mrec_tmp.sync));
 373                 }
 374         }
 375
 376         /*
 377          * If the -2 option was given (automatic when doing mirror-copy),
 378          * a two-way pipe is assumed and we expect a response mrec from
 379          * the target.
 380          */
 381         if (TwoWayPipeOpt) {
 382                 mrec = read_mrecord(0, &error, &pickup);
 383                 if (mrec == NULL ||
 384                     mrec->head.type != HAMMER_MREC_TYPE_UPDATE ||
 385                     mrec->head.rec_size != sizeof(mrec->update)) {
 386                         errx(1, "mirror_read: Did not get final "
 387                                 "acknowledgement packet from target");
 388                 }
 389                 if (interrupted) {
 390                         if (CyclePath) {
 391                                 hammer_set_cycle(&mirror.key_cur,
 392                                                  mirror.tid_beg);
 393                                 fprintf(stderr, "Cyclefile %s updated for "
 394                                         "continuation\n", CyclePath);
 395                         }
 396                 } else {
 397                         sync_tid = mrec->update.tid;
 398                         if (CyclePath) {
 399                                 hammer_key_beg_init(&mirror.key_beg);
 400                                 hammer_set_cycle(&mirror.key_beg, sync_tid);
 401                                 fprintf(stderr,
 402                                         "Cyclefile %s updated to 0x%016jx\n",
 403                                         CyclePath, (uintmax_t)sync_tid);
 404                         }
 405                 }
 406                 free(mrec);
 407         } else if (CyclePath) {
 408                 /* NOTE! mirror.tid_beg cannot be updated */
 409                 fprintf(stderr, "Warning: cycle file (-c option) cannot be "
 410                                 "fully updated unless you use mirror-copy\n");
 411                 hammer_set_cycle(&mirror.key_beg, mirror.tid_beg);
 412         }
 413         if (streaming && interrupted == 0) {
 414                 time_t t1 = time(NULL);
 415                 time_t t2;
 416
 417                 /*
 418                  * Try to break down large bulk transfers into smaller ones
 419                  * so it can sync the transaction id on the slave.  This
 420                  * way if we get interrupted a restart doesn't have to
 421                  * start from scratch.
 422                  */
 423                 if (streaming && histogram) {
 424                         if (histindex != histmax) {
 425                                 if (VerboseOpt && VerboseOpt < 2 &&
 426                                     streaming >= 0) {
 427                                         fprintf(stderr, " (bulk incremental)");
 428                                 }
 429                                 relpfs(fd, &pfs);
 430                                 goto again;
 431                         }
 432                 }
 433
 434                 if (VerboseOpt && streaming >= 0) {
 435                         fprintf(stderr, " W");
 436                         fflush(stderr);
 437                 } else if (streaming >= 0) {
 438                         score_printf(LINE1, "Waiting");
 439                 }
 440                 pfs.ondisk->sync_end_tid = mirror.tid_end;
 441                 if (streaming < 0) {
 442                         /*
 443                          * Fake streaming mode when using a histogram to
 444                          * break up a mirror-read, do not wait on source.
 445                          */
 446                         streaming = 0;
 447                 } else if (ioctl(fd, HAMMERIOC_WAI_PSEUDOFS, &pfs) < 0) {
 448                         score_printf(LINE3,
 449                                      "Mirror-read %s: cannot stream: %s\n",
 450                                      filesystem, strerror(errno));
 451                         fprintf(stderr,
 452                                 "Mirror-read %s: cannot stream: %s\n",
 453                                 filesystem, strerror(errno));
 454                 } else {
 455                         t2 = time(NULL) - t1;
 456                         if (t2 >= 0 && t2 < DelayOpt) {
 457                                 if (VerboseOpt) {
 458                                         fprintf(stderr, "\bD");
 459                                         fflush(stderr);
 460                                 }
 461                                 sleep(DelayOpt - t2);
 462                         }
 463                         if (VerboseOpt) {
 464                                 fprintf(stderr, "\b ");
 465                                 fflush(stderr);
 466                         }
 467                         relpfs(fd, &pfs);
 468                         goto again;
 469                 }
 470         }
 471         write_mrecord(1, HAMMER_MREC_TYPE_TERM,
 472                       &mrec_tmp, sizeof(mrec_tmp.sync));
 473         relpfs(fd, &pfs);
 474         free(buf);
 475         free(histogram_ary);
 476         fprintf(stderr, "Mirror-read %s succeeded\n", filesystem);
 477 }
 478
 479 /*
 480  * What we are trying to do here is figure out how much data is
 481  * going to be sent for the TID range and to break the TID range
 482  * down into reasonably-sized slices (from the point of view of
 483  * data sent) so a lost connection can restart at a reasonable
 484  * place and not all the way back at the beginning.
 485  *
 486  * An entry's TID serves as the end_tid for the prior entry
 487  * So we have to offset the calculation by 1 so that TID falls into
 488  * the previous entry when populating entries.
 489  *
 490  * Because the transaction id space is bursty we need a relatively
 491  * large number of buckets (like a million) to do a reasonable job
 492  * for things like an initial bulk mirrors on a very large filesystem.
 493  */
 494 #define HIST_COUNT      (1024 * 1024)
 495
 496 static int
 497 generate_histogram(int fd, const char *filesystem,
 498                    histogram_t *histogram_ary,
 499                    struct hammer_ioc_mirror_rw *mirror_base,
 500                    int *repeatp)
 501 {
 502         struct hammer_ioc_mirror_rw mirror;
 503         union hammer_ioc_mrecord_any *mrec;
 504         hammer_tid_t tid_beg;
 505         hammer_tid_t tid_end;
 506         hammer_tid_t tid;
 507         hammer_tid_t tidx;
 508         uint64_t *tid_bytes;
 509         uint64_t total;
 510         uint64_t accum;
 511         int chunkno;
 512         int i;
 513         int res;
 514         int off;
 515         int len;
 516
 517         mirror = *mirror_base;
 518         tid_beg = mirror.tid_beg;
 519         tid_end = mirror.tid_end;
 520         mirror.head.flags |= HAMMER_IOC_MIRROR_NODATA;
 521
 522         if (*histogram_ary == NULL) {
 523                 *histogram_ary = malloc(sizeof(struct histogram) *
 524                                         (HIST_COUNT + 2));
 525         }
 526         if (tid_beg >= tid_end)
 527                 return(0);
 528
 529         /* needs 2 extra */
 530         tid_bytes = malloc(sizeof(*tid_bytes) * (HIST_COUNT + 2));
 531         bzero(tid_bytes, sizeof(*tid_bytes) * (HIST_COUNT + 2));
 532
 533         if (*repeatp == 0) {
 534                 fprintf(stderr, "Prescan to break up bulk transfer");
 535                 if (VerboseOpt > 1)
 536                         fprintf(stderr, " (%juMB chunks)",
 537                                 (uintmax_t)(SplitupOpt / (1024 * 1024)));
 538                 fprintf(stderr, "\n");
 539         }
 540
 541         /*
 542          * Note: (tid_beg,tid_end), range is inclusive of both beg & end.
 543          *
 544          * Note: Estimates can be off when the mirror is way behind due
 545          *       to skips.
 546          */
 547         total = 0;
 548         accum = 0;
 549         chunkno = 0;
 550         for (;;) {
 551                 mirror.count = 0;
 552                 if (ioctl(fd, HAMMERIOC_MIRROR_READ, &mirror) < 0)
 553                         err(1, "Mirror-read %s failed", filesystem);
 554                 if (mirror.head.flags & HAMMER_IOC_HEAD_ERROR)
 555                         errx(1, "Mirror-read %s fatal error %d",
 556                                 filesystem, mirror.head.error);
 557                 for (off = 0;
 558                      off < mirror.count;
 559                      off += HAMMER_HEAD_DOALIGN(mrec->head.rec_size)) {
 560                         mrec = (void *)((char *)mirror.ubuf + off);
 561
 562                         /*
 563                          * We only care about general RECs and PASS
 564                          * records.  We ignore SKIPs.
 565                          */
 566                         switch (mrec->head.type & HAMMER_MRECF_TYPE_LOMASK) {
 567                         case HAMMER_MREC_TYPE_REC:
 568                         case HAMMER_MREC_TYPE_PASS:
 569                                 break;
 570                         default:
 571                                 continue;
 572                         }
 573
 574                         /*
 575                          * Calculate for two indices, create_tid and
 576                          * delete_tid.  Record data only applies to
 577                          * the create_tid.
 578                          *
 579                          * When tid is exactly on the boundary it really
 580                          * belongs to the previous entry because scans
 581                          * are inclusive of the ending entry.
 582                          */
 583                         tid = mrec->rec.leaf.base.delete_tid;
 584                         if (tid && tid >= tid_beg && tid <= tid_end) {
 585                                 len = HAMMER_HEAD_DOALIGN(mrec->head.rec_size);
 586                                 if (mrec->head.type ==
 587                                     HAMMER_MREC_TYPE_REC) {
 588                                         len -= HAMMER_HEAD_DOALIGN(
 589                                                     mrec->rec.leaf.data_len);
 590                                         assert(len > 0);
 591                                 }
 592                                 i = (tid - tid_beg) * HIST_COUNT /
 593                                     (tid_end - tid_beg);
 594                                 tidx = tid_beg + i * (tid_end - tid_beg) /
 595                                                  HIST_COUNT;
 596                                 if (tid == tidx && i)
 597                                         --i;
 598                                 assert(i >= 0 && i < HIST_COUNT);
 599                                 tid_bytes[i] += len;
 600                                 total += len;
 601                                 accum += len;
 602                         }
 603
 604                         tid = mrec->rec.leaf.base.create_tid;
 605                         if (tid && tid >= tid_beg && tid <= tid_end) {
 606                                 len = HAMMER_HEAD_DOALIGN(mrec->head.rec_size);
 607                                 if (mrec->head.type ==
 608                                     HAMMER_MREC_TYPE_REC_NODATA) {
 609                                         len += HAMMER_HEAD_DOALIGN(
 610                                                     mrec->rec.leaf.data_len);
 611                                 }
 612                                 i = (tid - tid_beg) * HIST_COUNT /
 613                                     (tid_end - tid_beg);
 614                                 tidx = tid_beg + i * (tid_end - tid_beg) /
 615                                                  HIST_COUNT;
 616                                 if (tid == tidx && i)
 617                                         --i;
 618                                 assert(i >= 0 && i < HIST_COUNT);
 619                                 tid_bytes[i] += len;
 620                                 total += len;
 621                                 accum += len;
 622                         }
 623                 }
 624                 if (*repeatp == 0 && accum > SplitupOpt) {
 625                         if (VerboseOpt > 1) {
 626                                 fprintf(stderr, ".");
 627                                 fflush(stderr);
 628                         }
 629                         ++chunkno;
 630                         score_printf(LINE2, "Prescan chunk %d", chunkno);
 631                         accum = 0;
 632                 }
 633                 if (mirror.count == 0)
 634                         break;
 635                 mirror.key_beg = mirror.key_cur;
 636         }
 637
 638         /*
 639          * Reduce to SplitupOpt (default 4GB) chunks.  This code may
 640          * use up to two additional elements.  Do the array in-place.
 641          *
 642          * Inefficient degenerate cases can occur if we do not accumulate
 643          * at least the requested split amount, so error on the side of
 644          * going over a bit.
 645          */
 646         res = 0;
 647         (*histogram_ary)[res].tid = tid_beg;
 648         (*histogram_ary)[res].bytes = tid_bytes[0];
 649         for (i = 1; i < HIST_COUNT; ++i) {
 650                 if ((*histogram_ary)[res].bytes >= SplitupOpt) {
 651                         ++res;
 652                         (*histogram_ary)[res].tid = tid_beg +
 653                                         i * (tid_end - tid_beg) /
 654                                         HIST_COUNT;
 655                         (*histogram_ary)[res].bytes = 0;
 656
 657                 }
 658                 (*histogram_ary)[res].bytes += tid_bytes[i];
 659         }
 660         ++res;
 661         (*histogram_ary)[res].tid = tid_end;
 662         (*histogram_ary)[res].bytes = -1;
 663
 664         if (*repeatp == 0) {
 665                 if (VerboseOpt > 1)
 666                         fprintf(stderr, "\n");  /* newline after ... */
 667                 score_printf(LINE3, "Prescan %d chunks, total %ju MBytes",
 668                         res, (uintmax_t)total / (1024 * 1024));
 669                 fprintf(stderr, "Prescan %d chunks, total %ju MBytes (",
 670                         res, (uintmax_t)total / (1024 * 1024));
 671                 for (i = 0; i < res && i < 3; ++i) {
 672                         if (i)
 673                                 fprintf(stderr, ", ");
 674                         fprintf(stderr, "%ju",
 675                                 (uintmax_t)(*histogram_ary)[i].bytes);
 676                 }
 677                 if (i < res)
 678                         fprintf(stderr, ", ...");
 679                 fprintf(stderr, ")\n");
 680         }
 681         assert(res <= HIST_COUNT);
 682         *repeatp = 1;
 683
 684         free(tid_bytes);
 685         return(res);
 686 }
 687
 688 static void
 689 create_pfs(const char *filesystem, uuid_t *s_uuid)
 690 {
 691         if (ForceYesOpt == 1) {
 692                 fprintf(stderr, "PFS slave %s does not exist. "
 693                         "Auto create new slave PFS!\n", filesystem);
 694
 695         } else {
 696                 fprintf(stderr, "PFS slave %s does not exist.\n"
 697                         "Do you want to create a new slave PFS? [y/n] ",
 698                         filesystem);
 699                 fflush(stderr);
 700                 if (getyntty() != 1)
 701                         errx(1, "Aborting operation");
 702         }
 703
 704         uint32_t status;
 705         char *shared_uuid = NULL;
 706         uuid_to_string(s_uuid, &shared_uuid, &status);
 707
 708         char *cmd = NULL;
 709         asprintf(&cmd, "/sbin/hammer pfs-slave '%s' shared-uuid=%s 1>&2",
 710                  filesystem, shared_uuid);
 711         free(shared_uuid);
 712
 713         if (cmd == NULL)
 714                 errx(1, "Failed to alloc memory");
 715         if (system(cmd) != 0)
 716                 fprintf(stderr, "Failed to create PFS\n");
 717         free(cmd);
 718 }
 719
 720 /*
 721  * Pipe the mirroring data stream on stdin to the HAMMER VFS, adding
 722  * some additional packet types to negotiate TID ranges and to verify
 723  * completion.  The HAMMER VFS does most of the work.
 724  *
 725  * It is important to note that the mirror.key_{beg,end} range must
 726  * match the ranged used by the original.  For now both sides use
 727  * range the entire key space.
 728  *
 729  * It is even more important that the records in the stream conform
 730  * to the TID range also supplied in the stream.  The HAMMER VFS will
 731  * use the REC, PASS, and SKIP record types to track the portions of
 732  * the B-Tree being scanned in order to be able to proactively delete
 733  * records on the target within those active areas that are not mentioned
 734  * by the source.
 735  *
 736  * The mirror.key_cur field is used by the VFS to do this tracking.  It
 737  * must be initialized to key_beg but then is persistently updated by
 738  * the HAMMER VFS on each successive ioctl() call.  If you blow up this
 739  * field you will blow up the mirror target, possibly to the point of
 740  * deleting everything.  As a safety measure the HAMMER VFS simply marks
 741  * the records that the source has destroyed as deleted on the target,
 742  * and normal pruning operations will deal with their final disposition
 743  * at some later time.
 744  */
 745 void
 746 hammer_cmd_mirror_write(char **av, int ac)
 747 {
 748         struct hammer_ioc_mirror_rw mirror;
 749         const char *filesystem;
 750         char *buf = malloc(SERIALBUF_SIZE);
 751         struct hammer_ioc_pseudofs_rw pfs;
 752         struct hammer_ioc_mrecord_head pickup;
 753         struct hammer_ioc_synctid synctid;
 754         union hammer_ioc_mrecord_any mrec_tmp;
 755         hammer_ioc_mrecord_any_t mrec;
 756         struct stat st;
 757         int error;
 758         int fd;
 759         int n;
 760
 761         if (ac != 1)
 762                 mirror_usage(1);
 763         filesystem = av[0];
 764         hammer_check_restrict(filesystem);
 765
 766         pickup.signature = 0;
 767         pickup.type = 0;
 768
 769 again:
 770         bzero(&mirror, sizeof(mirror));
 771         hammer_key_beg_init(&mirror.key_beg);
 772         hammer_key_end_init(&mirror.key_end);
 773         mirror.key_end = mirror.key_beg;
 774
 775         /*
 776          * Read initial packet
 777          */
 778         mrec = read_mrecord(0, &error, &pickup);
 779         if (mrec == NULL) {
 780                 if (error == 0)
 781                         errx(1, "validate_mrec_header: short read");
 782                 exit(1);
 783         }
 784         /*
 785          * Validate packet
 786          */
 787         if (mrec->head.type == HAMMER_MREC_TYPE_TERM) {
 788                 free(buf);
 789                 return;
 790         }
 791         if (mrec->head.type != HAMMER_MREC_TYPE_PFSD)
 792                 errx(1, "validate_mrec_header: did not get expected "
 793                         "PFSD record type");
 794         if (mrec->head.rec_size != sizeof(mrec->pfs))
 795                 errx(1, "validate_mrec_header: unexpected payload size");
 796
 797         /*
 798          * Create slave PFS if it doesn't yet exist
 799          */
 800         if (lstat(filesystem, &st) != 0)
 801                 create_pfs(filesystem, &mrec->pfs.pfsd.shared_uuid);
 802         free(mrec);
 803         mrec = NULL;
 804
 805         fd = getpfs(&pfs, filesystem);
 806
 807         /*
 808          * In two-way mode the target writes out a PFS packet first.
 809          * The source uses our tid_end as its tid_beg by default,
 810          * picking up where it left off.
 811          */
 812         mirror.tid_beg = 0;
 813         if (TwoWayPipeOpt) {
 814                 generate_mrec_header(fd, pfs.pfs_id, &mrec_tmp);
 815                 if (mirror.tid_beg < mrec_tmp.pfs.pfsd.sync_beg_tid)
 816                         mirror.tid_beg = mrec_tmp.pfs.pfsd.sync_beg_tid;
 817                 mirror.tid_end = mrec_tmp.pfs.pfsd.sync_end_tid;
 818                 write_mrecord(1, HAMMER_MREC_TYPE_PFSD,
 819                               &mrec_tmp, sizeof(mrec_tmp.pfs));
 820         }
 821
 822         /*
 823          * Read and process the PFS header.  The source informs us of
 824          * the TID range the stream represents.
 825          */
 826         n = validate_mrec_header(fd, 0, 1, pfs.pfs_id, &pickup,
 827                                  &mirror.tid_beg, &mirror.tid_end);
 828         if (n < 0) {    /* got TERM record */
 829                 relpfs(fd, &pfs);
 830                 free(buf);
 831                 return;
 832         }
 833
 834         mirror.ubuf = buf;
 835         mirror.size = SERIALBUF_SIZE;
 836
 837         /*
 838          * Read and process bulk records (REC, PASS, and SKIP types).
 839          *
 840          * On your life, do NOT mess with mirror.key_cur or your mirror
 841          * target may become history.
 842          */
 843         for (;;) {
 844                 mirror.count = 0;
 845                 mirror.pfs_id = pfs.pfs_id;
 846                 mirror.shared_uuid = pfs.ondisk->shared_uuid;
 847                 mirror.size = read_mrecords(0, buf, SERIALBUF_SIZE, &pickup);
 848                 if (mirror.size <= 0)
 849                         break;
 850                 if (ioctl(fd, HAMMERIOC_MIRROR_WRITE, &mirror) < 0)
 851                         err(1, "Mirror-write %s failed", filesystem);
 852                 if (mirror.head.flags & HAMMER_IOC_HEAD_ERROR)
 853                         errx(1, "Mirror-write %s fatal error %d",
 854                                 filesystem, mirror.head.error);
 855 #if 0
 856                 if (mirror.head.flags & HAMMER_IOC_HEAD_INTR) {
 857                         errx(1, "Mirror-write %s interrupted by timer at"
 858                                 " %016llx",
 859                                 filesystem,
 860                                 mirror.key_cur.obj_id);
 861                 }
 862 #endif
 863         }
 864
 865         /*
 866          * Read and process the termination sync record.
 867          */
 868         mrec = read_mrecord(0, &error, &pickup);
 869
 870         if (mrec && mrec->head.type == HAMMER_MREC_TYPE_TERM) {
 871                 fprintf(stderr, "Mirror-write: received termination request\n");
 872                 relpfs(fd, &pfs);
 873                 free(mrec);
 874                 free(buf);
 875                 return;
 876         }
 877
 878         if (mrec == NULL ||
 879             (mrec->head.type != HAMMER_MREC_TYPE_SYNC &&
 880              mrec->head.type != HAMMER_MREC_TYPE_IDLE) ||
 881             mrec->head.rec_size != sizeof(mrec->sync)) {
 882                 errx(1, "Mirror-write %s: Did not get termination "
 883                         "sync record, or rec_size is wrong rt=%d",
 884                         filesystem, (mrec ? (int)mrec->head.type : -1));
 885         }
 886
 887         /*
 888          * Update the PFS info on the target so the user has visibility
 889          * into the new snapshot, and sync the target filesystem.
 890          */
 891         if (mrec->head.type == HAMMER_MREC_TYPE_SYNC) {
 892                 update_pfs_snapshot(fd, mirror.tid_end, pfs.pfs_id);
 893
 894                 bzero(&synctid, sizeof(synctid));
 895                 synctid.op = HAMMER_SYNCTID_SYNC2;
 896                 ioctl(fd, HAMMERIOC_SYNCTID, &synctid);
 897
 898                 if (VerboseOpt >= 2) {
 899                         fprintf(stderr, "Mirror-write %s: succeeded\n",
 900                                 filesystem);
 901                 }
 902         }
 903
 904         free(mrec);
 905         mrec = NULL;
 906
 907         /*
 908          * Report back to the originator.
 909          */
 910         if (TwoWayPipeOpt) {
 911                 mrec_tmp.update.tid = mirror.tid_end;
 912                 write_mrecord(1, HAMMER_MREC_TYPE_UPDATE,
 913                               &mrec_tmp, sizeof(mrec_tmp.update));
 914         } else {
 915                 printf("Source can update synctid to 0x%016jx\n",
 916                        (uintmax_t)mirror.tid_end);
 917         }
 918         relpfs(fd, &pfs);
 919         goto again;
 920 }
 921
 922 void
 923 hammer_cmd_mirror_dump(char **av, int ac)
 924 {
 925         char *buf = malloc(SERIALBUF_SIZE);
 926         struct hammer_ioc_mrecord_head pickup;
 927         hammer_ioc_mrecord_any_t mrec;
 928         int error;
 929         int size;
 930         int offset;
 931         int bytes;
 932         int header_only = 0;
 933
 934         if (ac == 1 && strcmp(*av, "header") == 0)
 935                 header_only = 1;
 936         else if (ac != 0)
 937                 mirror_usage(1);
 938
 939         /*
 940          * Read and process the PFS header
 941          */
 942         pickup.signature = 0;
 943         pickup.type = 0;
 944
 945         mrec = read_mrecord(0, &error, &pickup);
 946
 947         /*
 948          * Dump the PFS header. mirror-dump takes its input from the output
 949          * of a mirror-read so getpfs() can't be used to get a fd to be passed
 950          * to dump_pfsd().
 951          */
 952         if (header_only && mrec != NULL) {
 953                 dump_pfsd(&mrec->pfs.pfsd, -1);
 954                 free(mrec);
 955                 free(buf);
 956                 return;
 957         }
 958         free(mrec);
 959
 960 again:
 961         /*
 962          * Read and process bulk records
 963          */
 964         for (;;) {
 965                 size = read_mrecords(0, buf, SERIALBUF_SIZE, &pickup);
 966                 if (size <= 0)
 967                         break;
 968                 offset = 0;
 969                 while (offset < size) {
 970                         mrec = (void *)((char *)buf + offset);
 971                         bytes = HAMMER_HEAD_DOALIGN(mrec->head.rec_size);
 972                         if (offset + bytes > size)
 973                                 errx(1, "Misaligned record");
 974
 975                         switch(mrec->head.type & HAMMER_MRECF_TYPE_MASK) {
 976                         case HAMMER_MREC_TYPE_REC_BADCRC:
 977                         case HAMMER_MREC_TYPE_REC:
 978                                 printf("Record lo=%08x obj=%016jx key=%016jx "
 979                                        "rt=%02x ot=%02x",
 980                                         mrec->rec.leaf.base.localization,
 981                                         (uintmax_t)mrec->rec.leaf.base.obj_id,
 982                                         (uintmax_t)mrec->rec.leaf.base.key,
 983                                         mrec->rec.leaf.base.rec_type,
 984                                         mrec->rec.leaf.base.obj_type);
 985                                 if (mrec->head.type ==
 986                                     HAMMER_MREC_TYPE_REC_BADCRC) {
 987                                         printf(" (BAD CRC)");
 988                                 }
 989                                 printf("\n");
 990                                 printf("       tids %016jx:%016jx data=%d\n",
 991                                     (uintmax_t)mrec->rec.leaf.base.create_tid,
 992                                     (uintmax_t)mrec->rec.leaf.base.delete_tid,
 993                                     mrec->rec.leaf.data_len);
 994                                 break;
 995                         case HAMMER_MREC_TYPE_PASS:
 996                                 printf("Pass   lo=%08x obj=%016jx key=%016jx "
 997                                        "rt=%02x ot=%02x\n",
 998                                         mrec->rec.leaf.base.localization,
 999                                         (uintmax_t)mrec->rec.leaf.base.obj_id,
1000                                         (uintmax_t)mrec->rec.leaf.base.key,
1001                                         mrec->rec.leaf.base.rec_type,
1002                                         mrec->rec.leaf.base.obj_type);
1003                                 printf("       tids %016jx:%016jx data=%d\n",
1004                                     (uintmax_t)mrec->rec.leaf.base.create_tid,
1005                                     (uintmax_t)mrec->rec.leaf.base.delete_tid,
1006                                         mrec->rec.leaf.data_len);
1007                                 break;
1008                         case HAMMER_MREC_TYPE_SKIP:
1009                                 printf("Skip   lo=%08x obj=%016jx key=%016jx rt=%02x to\n"
1010                                        "       lo=%08x obj=%016jx key=%016jx rt=%02x\n",
1011                                        mrec->skip.skip_beg.localization,
1012                                        (uintmax_t)mrec->skip.skip_beg.obj_id,
1013                                        (uintmax_t)mrec->skip.skip_beg.key,
1014                                        mrec->skip.skip_beg.rec_type,
1015                                        mrec->skip.skip_end.localization,
1016                                        (uintmax_t)mrec->skip.skip_end.obj_id,
1017                                        (uintmax_t)mrec->skip.skip_end.key,
1018                                        mrec->skip.skip_end.rec_type);
1019                         default:
1020                                 break;
1021                         }
1022                         offset += bytes;
1023                 }
1024         }
1025
1026         /*
1027          * Read and process the termination sync record.
1028          */
1029         mrec = read_mrecord(0, &error, &pickup);
1030         if (mrec == NULL ||
1031             (mrec->head.type != HAMMER_MREC_TYPE_SYNC &&
1032              mrec->head.type != HAMMER_MREC_TYPE_IDLE)) {
1033                 fprintf(stderr, "Mirror-dump: Did not get termination "
1034                                 "sync record\n");
1035         }
1036         free(mrec);
1037
1038         /*
1039          * Continue with more batches until EOF.
1040          */
1041         mrec = read_mrecord(0, &error, &pickup);
1042         if (mrec) {
1043                 free(mrec);
1044                 goto again;
1045         }
1046         free(buf);
1047 }
1048
1049 void
1050 hammer_cmd_mirror_copy(char **av, int ac, int streaming)
1051 {
1052         pid_t pid1;
1053         pid_t pid2;
1054         int fds[2];
1055         const char *xav[32];
1056         char tbuf[16];
1057         char *sh, *user, *host, *rfs;
1058         int xac;
1059
1060         if (ac != 2)
1061                 mirror_usage(1);
1062
1063         TwoWayPipeOpt = 1;
1064         signal(SIGPIPE, SIG_IGN);
1065
1066 again:
1067         if (pipe(fds) < 0)
1068                 err(1, "pipe");
1069
1070         /*
1071          * Source
1072          */
1073         if ((pid1 = fork()) == 0) {
1074                 signal(SIGPIPE, SIG_DFL);
1075                 dup2(fds[0], 0);
1076                 dup2(fds[0], 1);
1077                 close(fds[0]);
1078                 close(fds[1]);
1079                 if ((rfs = strchr(av[0], ':')) != NULL) {
1080                         xac = 0;
1081
1082                         if((sh = getenv("HAMMER_RSH")) == NULL)
1083                                 xav[xac++] = "ssh";
1084                         else
1085                                 xav[xac++] = sh;
1086
1087                         if (CompressOpt)
1088                                 xav[xac++] = "-C";
1089
1090                         if ((host = strchr(av[0], '@')) != NULL) {
1091                                 user = strndup( av[0], (host++ - av[0]));
1092                                 host = strndup( host, (rfs++ - host));
1093                                 xav[xac++] = "-l";
1094                                 xav[xac++] = user;
1095                                 xav[xac++] = host;
1096                         } else {
1097                                 host = strndup( av[0], (rfs++ - av[0]));
1098                                 user = NULL;
1099                                 xav[xac++] = host;
1100                         }
1101
1102
1103                         if (SshPort) {
1104                                 xav[xac++] = "-p";
1105                                 xav[xac++] = SshPort;
1106                         }
1107
1108                         xav[xac++] = "hammer";
1109
1110                         switch(VerboseOpt) {
1111                         case 0:
1112                                 break;
1113                         case 1:
1114                                 xav[xac++] = "-v";
1115                                 break;
1116                         case 2:
1117                                 xav[xac++] = "-vv";
1118                                 break;
1119                         default:
1120                                 xav[xac++] = "-vvv";
1121                                 break;
1122                         }
1123                         if (ForceYesOpt)
1124                                 xav[xac++] = "-y";
1125                         xav[xac++] = "-2";
1126                         if (TimeoutOpt) {
1127                                 snprintf(tbuf, sizeof(tbuf), "%d", TimeoutOpt);
1128                                 xav[xac++] = "-t";
1129                                 xav[xac++] = tbuf;
1130                         }
1131                         if (SplitupOptStr) {
1132                                 xav[xac++] = "-S";
1133                                 xav[xac++] = SplitupOptStr;
1134                         }
1135                         if (streaming)
1136                                 xav[xac++] = "mirror-read-stream";
1137                         else
1138                                 xav[xac++] = "mirror-read";
1139                         xav[xac++] = rfs;
1140                         xav[xac++] = NULL;
1141                         execvp(*xav, (void *)xav);
1142                 } else {
1143                         hammer_cmd_mirror_read(av, 1, streaming);
1144                         fflush(stdout);
1145                         fflush(stderr);
1146                 }
1147                 _exit(1);
1148         }
1149
1150         /*
1151          * Target
1152          */
1153         if ((pid2 = fork()) == 0) {
1154                 signal(SIGPIPE, SIG_DFL);
1155                 dup2(fds[1], 0);
1156                 dup2(fds[1], 1);
1157                 close(fds[0]);
1158                 close(fds[1]);
1159                 if ((rfs = strchr(av[1], ':')) != NULL) {
1160                         xac = 0;
1161
1162                         if((sh = getenv("HAMMER_RSH")) == NULL)
1163                                 xav[xac++] = "ssh";
1164                         else
1165                                 xav[xac++] = sh;
1166
1167                         if (CompressOpt)
1168                                 xav[xac++] = "-C";
1169
1170                         if ((host = strchr(av[1], '@')) != NULL) {
1171                                 user = strndup( av[1], (host++ - av[1]));
1172                                 host = strndup( host, (rfs++ - host));
1173                                 xav[xac++] = "-l";
1174                                 xav[xac++] = user;
1175                                 xav[xac++] = host;
1176                         } else {
1177                                 host = strndup( av[1], (rfs++ - av[1]));
1178                                 user = NULL;
1179                                 xav[xac++] = host;
1180                         }
1181
1182                         if (SshPort) {
1183                                 xav[xac++] = "-p";
1184                                 xav[xac++] = SshPort;
1185                         }
1186
1187                         xav[xac++] = "hammer";
1188
1189                         switch(VerboseOpt) {
1190                         case 0:
1191                                 break;
1192                         case 1:
1193                                 xav[xac++] = "-v";
1194                                 break;
1195                         case 2:
1196                                 xav[xac++] = "-vv";
1197                                 break;
1198                         default:
1199                                 xav[xac++] = "-vvv";
1200                                 break;
1201                         }
1202                         if (ForceYesOpt)
1203                                 xav[xac++] = "-y";
1204                         xav[xac++] = "-2";
1205                         xav[xac++] = "mirror-write";
1206                         xav[xac++] = rfs;
1207                         xav[xac++] = NULL;
1208                         execvp(*xav, (void *)xav);
1209                 } else {
1210                         hammer_cmd_mirror_write(av + 1, 1);
1211                         fflush(stdout);
1212                         fflush(stderr);
1213                 }
1214                 _exit(1);
1215         }
1216         close(fds[0]);
1217         close(fds[1]);
1218
1219         while (waitpid(pid1, NULL, 0) <= 0)
1220                 ;
1221         while (waitpid(pid2, NULL, 0) <= 0)
1222                 ;
1223
1224         /*
1225          * If the link is lost restart
1226          */
1227         if (streaming) {
1228                 if (VerboseOpt) {
1229                         fprintf(stderr, "\nLost Link\n");
1230                         fflush(stderr);
1231                 }
1232                 sleep(15 + DelayOpt);
1233                 goto again;
1234         }
1235
1236 }
1237
1238 /*
1239  * Read and return multiple mrecords
1240  */
1241 static int
1242 read_mrecords(int fd, char *buf, u_int size, hammer_ioc_mrecord_head_t pickup)
1243 {
1244         hammer_ioc_mrecord_any_t mrec;
1245         u_int count;
1246         size_t n;
1247         size_t i;
1248         size_t bytes;
1249         int type;
1250
1251         count = 0;
1252         while (size - count >= HAMMER_MREC_HEADSIZE) {
1253                 /*
1254                  * Cached the record header in case we run out of buffer
1255                  * space.
1256                  */
1257                 fflush(stdout);
1258                 if (pickup->signature == 0) {
1259                         for (n = 0; n < HAMMER_MREC_HEADSIZE; n += i) {
1260                                 i = read(fd, (char *)pickup + n,
1261                                          HAMMER_MREC_HEADSIZE - n);
1262                                 if (i <= 0)
1263                                         break;
1264                         }
1265                         if (n == 0)
1266                                 break;
1267                         if (n != HAMMER_MREC_HEADSIZE)
1268                                 errx(1, "read_mrecords: short read on pipe");
1269                         if (pickup->signature != HAMMER_IOC_MIRROR_SIGNATURE)
1270                                 errx(1, "read_mrecords: malformed record on pipe, "
1271                                         "bad signature");
1272                 }
1273                 if (pickup->rec_size < HAMMER_MREC_HEADSIZE ||
1274                     pickup->rec_size > sizeof(*mrec) + HAMMER_XBUFSIZE)
1275                         errx(1, "read_mrecords: malformed record on pipe, "
1276                                 "illegal rec_size");
1277
1278                 /*
1279                  * Stop if we have insufficient space for the record and data.
1280                  */
1281                 bytes = HAMMER_HEAD_DOALIGN(pickup->rec_size);
1282                 if (size - count < bytes)
1283                         break;
1284
1285                 /*
1286                  * Stop if the record type is not a REC, SKIP, or PASS,
1287                  * which are the only types the ioctl supports.  Other types
1288                  * are used only by the userland protocol.
1289                  *
1290                  * Ignore all flags.
1291                  */
1292                 type = pickup->type & HAMMER_MRECF_TYPE_LOMASK;
1293                 if (type != HAMMER_MREC_TYPE_PFSD &&
1294                     type != HAMMER_MREC_TYPE_REC &&
1295                     type != HAMMER_MREC_TYPE_SKIP &&
1296                     type != HAMMER_MREC_TYPE_PASS) {
1297                         break;
1298                 }
1299
1300                 /*
1301                  * Read the remainder and clear the pickup signature.
1302                  */
1303                 for (n = HAMMER_MREC_HEADSIZE; n < bytes; n += i) {
1304                         i = read(fd, buf + count + n, bytes - n);
1305                         if (i <= 0)
1306                                 break;
1307                 }
1308                 if (n != bytes)
1309                         errx(1, "read_mrecords: short read on pipe");
1310
1311                 bcopy(pickup, buf + count, HAMMER_MREC_HEADSIZE);
1312                 pickup->signature = 0;
1313                 pickup->type = 0;
1314                 mrec = (void *)(buf + count);
1315
1316                 /*
1317                  * Validate the completed record
1318                  */
1319                 if (!hammer_crc_test_mrec_head(&mrec->head, mrec->head.rec_size))
1320                         errx(1, "read_mrecords: malformed record on pipe, bad crc");
1321
1322                 /*
1323                  * If its a B-Tree record validate the data crc.
1324                  *
1325                  * NOTE: If the VFS passes us an explicitly errorde mrec
1326                  *       we just pass it through.
1327                  */
1328                 type = mrec->head.type & HAMMER_MRECF_TYPE_MASK;
1329
1330                 if (type == HAMMER_MREC_TYPE_REC) {
1331                         if (mrec->head.rec_size <
1332                             sizeof(mrec->rec) + mrec->rec.leaf.data_len) {
1333                                 errx(1, "read_mrecords: malformed record on "
1334                                         "pipe, illegal element data_len");
1335                         }
1336                         if (mrec->rec.leaf.data_len &&
1337                             mrec->rec.leaf.data_offset &&
1338                             hammer_crc_test_leaf(HammerVersion, &mrec->rec + 1, &mrec->rec.leaf) == 0) {
1339                                 fprintf(stderr,
1340                                         "read_mrecords: data_crc did not "
1341                                         "match data! obj=%016jx key=%016jx\n",
1342                                         (uintmax_t)mrec->rec.leaf.base.obj_id,
1343                                         (uintmax_t)mrec->rec.leaf.base.key);
1344                                 fprintf(stderr,
1345                                         "continuing, but there are problems\n");
1346                         }
1347                 }
1348                 count += bytes;
1349         }
1350         return(count);
1351 }
1352
1353 /*
1354  * Read and return a single mrecord.
1355  */
1356 static
1357 hammer_ioc_mrecord_any_t
1358 read_mrecord(int fdin, int *errorp, hammer_ioc_mrecord_head_t pickup)
1359 {
1360         hammer_ioc_mrecord_any_t mrec;
1361         struct hammer_ioc_mrecord_head mrechd;
1362         size_t bytes;
1363         size_t n;
1364         size_t i;
1365
1366         if (pickup && pickup->type != 0) {
1367                 mrechd = *pickup;
1368                 pickup->signature = 0;
1369                 pickup->type = 0;
1370                 n = HAMMER_MREC_HEADSIZE;
1371         } else {
1372                 /*
1373                  * Read in the PFSD header from the sender.
1374                  */
1375                 for (n = 0; n < HAMMER_MREC_HEADSIZE; n += i) {
1376                         i = read(fdin, (char *)&mrechd + n, HAMMER_MREC_HEADSIZE - n);
1377                         if (i <= 0)
1378                                 break;
1379                 }
1380                 if (n == 0) {
1381                         *errorp = 0;    /* EOF */
1382                         return(NULL);
1383                 }
1384                 if (n != HAMMER_MREC_HEADSIZE) {
1385                         fprintf(stderr, "short read of mrecord header\n");
1386                         *errorp = EPIPE;
1387                         return(NULL);
1388                 }
1389         }
1390         if (mrechd.signature != HAMMER_IOC_MIRROR_SIGNATURE) {
1391                 fprintf(stderr, "read_mrecord: bad signature\n");
1392                 *errorp = EINVAL;
1393                 return(NULL);
1394         }
1395         bytes = HAMMER_HEAD_DOALIGN(mrechd.rec_size);
1396         assert(bytes >= sizeof(mrechd));
1397         mrec = malloc(bytes);
1398         mrec->head = mrechd;
1399
1400         while (n < bytes) {
1401                 i = read(fdin, (char *)mrec + n, bytes - n);
1402                 if (i <= 0)
1403                         break;
1404                 n += i;
1405         }
1406         if (n != bytes) {
1407                 fprintf(stderr, "read_mrecord: short read on payload\n");
1408                 *errorp = EPIPE;
1409                 return(NULL);
1410         }
1411         if (!hammer_crc_test_mrec_head(&mrec->head, mrec->head.rec_size)) {
1412                 fprintf(stderr, "read_mrecord: bad CRC\n");
1413                 *errorp = EINVAL;
1414                 return(NULL);
1415         }
1416         *errorp = 0;
1417         return(mrec);
1418 }
1419
1420 static
1421 void
1422 write_mrecord(int fdout, uint32_t type, hammer_ioc_mrecord_any_t mrec,
1423               int bytes)
1424 {
1425         char zbuf[HAMMER_HEAD_ALIGN];
1426         int pad;
1427
1428         pad = HAMMER_HEAD_DOALIGN(bytes) - bytes;
1429
1430         assert(bytes >= (int)sizeof(mrec->head));
1431         bzero(&mrec->head, sizeof(mrec->head));
1432         mrec->head.signature = HAMMER_IOC_MIRROR_SIGNATURE;
1433         mrec->head.type = type;
1434         mrec->head.rec_size = bytes;
1435         hammer_crc_set_mrec_head(&mrec->head, bytes);
1436         if (write(fdout, mrec, bytes) != bytes)
1437                 err(1, "write_mrecord");
1438         if (pad) {
1439                 bzero(zbuf, pad);
1440                 if (write(fdout, zbuf, pad) != pad)
1441                         err(1, "write_mrecord");
1442         }
1443 }
1444
1445 /*
1446  * Generate a mirroring header with the pfs information of the
1447  * originating filesytem.
1448  */
1449 static void
1450 generate_mrec_header(int fd, int pfs_id,
1451                      union hammer_ioc_mrecord_any *mrec_tmp)
1452 {
1453         struct hammer_ioc_pseudofs_rw pfs;
1454
1455         bzero(mrec_tmp, sizeof(*mrec_tmp));
1456         clrpfs(&pfs, &mrec_tmp->pfs.pfsd, pfs_id);
1457
1458         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0)
1459                 err(1, "Mirror-read: not a HAMMER fs/pseudofs!");
1460         if (pfs.version != HAMMER_IOC_PSEUDOFS_VERSION)
1461                 errx(1, "Mirror-read: HAMMER PFS version mismatch!");
1462         mrec_tmp->pfs.version = pfs.version;
1463 }
1464
1465 /*
1466  * Validate the pfs information from the originating filesystem
1467  * against the target filesystem.  shared_uuid must match.
1468  *
1469  * return -1 if we got a TERM record
1470  */
1471 static int
1472 validate_mrec_header(int fd, int fdin, int is_target, int pfs_id,
1473                      struct hammer_ioc_mrecord_head *pickup,
1474                      hammer_tid_t *tid_begp, hammer_tid_t *tid_endp)
1475 {
1476         struct hammer_ioc_pseudofs_rw pfs;
1477         struct hammer_pseudofs_data pfsd;
1478         hammer_ioc_mrecord_any_t mrec;
1479         int error;
1480
1481         /*
1482          * Get the PFSD info from the target filesystem.
1483          */
1484         clrpfs(&pfs, &pfsd, pfs_id);
1485         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0)
1486                 err(1, "mirror-write: not a HAMMER fs/pseudofs!");
1487         if (pfs.version != HAMMER_IOC_PSEUDOFS_VERSION)
1488                 errx(1, "mirror-write: HAMMER PFS version mismatch!");
1489
1490         mrec = read_mrecord(fdin, &error, pickup);
1491         if (mrec == NULL) {
1492                 if (error == 0)
1493                         errx(1, "validate_mrec_header: short read");
1494                 exit(1);
1495         }
1496         if (mrec->head.type == HAMMER_MREC_TYPE_TERM) {
1497                 free(mrec);
1498                 return(-1);
1499         }
1500
1501         if (mrec->head.type != HAMMER_MREC_TYPE_PFSD)
1502                 errx(1, "validate_mrec_header: did not get expected "
1503                         "PFSD record type");
1504         if (mrec->head.rec_size != sizeof(mrec->pfs))
1505                 errx(1, "validate_mrec_header: unexpected payload size");
1506         if (mrec->pfs.version != pfs.version)
1507                 errx(1, "validate_mrec_header: Version mismatch");
1508
1509         /*
1510          * Whew.  Ok, is the read PFS info compatible with the target?
1511          */
1512         if (bcmp(&mrec->pfs.pfsd.shared_uuid, &pfsd.shared_uuid,
1513                 sizeof(pfsd.shared_uuid)) != 0)
1514                 errx(1, "mirror-write: source and target have "
1515                         "different shared-uuid's!");
1516         if (is_target && hammer_is_pfs_master(&pfsd))
1517                 errx(1, "mirror-write: target must be in slave mode");
1518         if (tid_begp)
1519                 *tid_begp = mrec->pfs.pfsd.sync_beg_tid;
1520         if (tid_endp)
1521                 *tid_endp = mrec->pfs.pfsd.sync_end_tid;
1522         free(mrec);
1523         return(0);
1524 }
1525
1526 static void
1527 update_pfs_snapshot(int fd, hammer_tid_t snapshot_tid, int pfs_id)
1528 {
1529         struct hammer_ioc_pseudofs_rw pfs;
1530         struct hammer_pseudofs_data pfsd;
1531
1532         clrpfs(&pfs, &pfsd, pfs_id);
1533         if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0)
1534                 err(1, "update_pfs_snapshot (read)");
1535
1536         if (pfsd.sync_end_tid != snapshot_tid) {
1537                 pfsd.sync_end_tid = snapshot_tid;
1538                 if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) != 0)
1539                         err(1, "update_pfs_snapshot (rewrite)");
1540                 if (VerboseOpt >= 2) {
1541                         fprintf(stderr,
1542                                 "Mirror-write: Completed, updated snapshot "
1543                                 "to %016jx\n",
1544                                 (uintmax_t)snapshot_tid);
1545                         fflush(stderr);
1546                 }
1547         }
1548 }
1549
1550 /*
1551  * Bandwidth-limited write in chunks
1552  */
1553 static
1554 ssize_t
1555 writebw(int fd, const void *buf, size_t nbytes,
1556         uint64_t *bwcount, struct timeval *tv1)
1557 {
1558         struct timeval tv2;
1559         size_t n;
1560         ssize_t r;
1561         ssize_t a;
1562         int usec;
1563
1564         a = 0;
1565         r = 0;
1566         while (nbytes) {
1567                 if (*bwcount + nbytes > BandwidthOpt)
1568                         n = BandwidthOpt - *bwcount;
1569                 else
1570                         n = nbytes;
1571                 if (n)
1572                         r = write(fd, buf, n);
1573                 if (r >= 0) {
1574                         a += r;
1575                         nbytes -= r;
1576                         buf = (const char *)buf + r;
1577                 }
1578                 if ((size_t)r != n)
1579                         break;
1580                 *bwcount += n;
1581                 if (*bwcount >= BandwidthOpt) {
1582                         gettimeofday(&tv2, NULL);
1583                         usec = (int)(tv2.tv_sec - tv1->tv_sec) * 1000000 +
1584                                 (int)(tv2.tv_usec - tv1->tv_usec);
1585                         if (usec >= 0 && usec < 1000000)
1586                                 usleep(1000000 - usec);
1587                         gettimeofday(tv1, NULL);
1588                         *bwcount -= BandwidthOpt;
1589                 }
1590         }
1591         return(a ? a : r);
1592 }
1593
1594 /*
1595  * Get a yes or no answer from the terminal.  The program may be run as
1596  * part of a two-way pipe so we cannot use stdin for this operation.
1597  */
1598 static int
1599 getyntty(void)
1600 {
1601         char buf[256];
1602         FILE *fp;
1603         int result;
1604
1605         fp = fopen("/dev/tty", "r");
1606         if (fp == NULL) {
1607                 fprintf(stderr, "No terminal for response\n");
1608                 return(-1);
1609         }
1610         result = -1;
1611         while (fgets(buf, sizeof(buf), fp) != NULL) {
1612                 if (buf[0] == 'y' || buf[0] == 'Y') {
1613                         result = 1;
1614                         break;
1615                 }
1616                 if (buf[0] == 'n' || buf[0] == 'N') {
1617                         result = 0;
1618                         break;
1619                 }
1620                 fprintf(stderr, "Response not understood\n");
1621                 break;
1622         }
1623         fclose(fp);
1624         return(result);
1625 }
1626
1627 static void
1628 score_printf(size_t i, size_t w, const char *ctl, ...)
1629 {
1630         va_list va;
1631         size_t n;
1632         static size_t SSize;
1633         static int SFd = -1;
1634         static char ScoreBuf[1024];
1635
1636         if (ScoreBoardFile == NULL)
1637                 return;
1638         assert(i + w < sizeof(ScoreBuf));
1639         if (SFd < 0) {
1640                 SFd = open(ScoreBoardFile, O_RDWR|O_CREAT|O_TRUNC, 0644);
1641                 if (SFd < 0)
1642                         return;
1643                 SSize = 0;
1644         }
1645         for (n = 0; n < i; ++n) {
1646                 if (ScoreBuf[n] == 0)
1647                         ScoreBuf[n] = ' ';
1648         }
1649         va_start(va, ctl);
1650         vsnprintf(ScoreBuf + i, w - 1, ctl, va);
1651         va_end(va);
1652         n = strlen(ScoreBuf + i);
1653         while (n < w - 1) {
1654                 ScoreBuf[i + n] = ' ';
1655                 ++n;
1656         }
1657         ScoreBuf[i + n] = '\n';
1658         if (SSize < i + w)
1659                 SSize = i + w;
1660         pwrite(SFd, ScoreBuf, SSize, 0);
1661 }
1662
1663 static void
1664 hammer_check_restrict(const char *filesystem)
1665 {
1666         size_t rlen;
1667         int atslash;
1668
1669         if (RestrictTarget == NULL)
1670                 return;
1671         rlen = strlen(RestrictTarget);
1672         if (strncmp(filesystem, RestrictTarget, rlen) != 0)
1673                 errx(1, "hammer-remote: restricted target");
1674
1675         atslash = 1;
1676         while (filesystem[rlen]) {
1677                 if (atslash &&
1678                     filesystem[rlen] == '.' &&
1679                     filesystem[rlen+1] == '.') {
1680                         errx(1, "hammer-remote: '..' not allowed");
1681                 }
1682                 if (filesystem[rlen] == '/')
1683                         atslash = 1;
1684                 else
1685                         atslash = 0;
1686                 ++rlen;
1687         }
1688 }
1689
1690 static void
1691 mirror_usage(int code)
1692 {
1693         fprintf(stderr,
1694                 "hammer mirror-read <filesystem> [begin-tid]\n"
1695                 "hammer mirror-read-stream <filesystem> [begin-tid]\n"
1696                 "hammer mirror-write <filesystem>\n"
1697                 "hammer mirror-dump [header]\n"
1698                 "hammer mirror-copy [[user@]host:]<filesystem>"
1699                                   " [[user@]host:]<filesystem>\n"
1700                 "hammer mirror-stream [[user@]host:]<filesystem>"
1701                                     " [[user@]host:]<filesystem>\n"
1702         );
1703         exit(code);
1704 }
1705