lustre/utils/lustre_rsync.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/utils/lustre_rsync.c
  33  *
  34  * Author: Kalpak Shah <Kalpak.Shah@Sun.COM>
  35  * Author: Manoj Joseph <Manoj.Joseph@Sun.COM>
  36  */
  37
  38 /*
  39  * - lustre_rsync is a tool for replicating a lustre filesystem.
  40  *
  41  * - The source-fs is a live lustre filesystem. It is not a
  42  * snapshot. It is mounted and undergoing changes
  43  *
  44  * - The target-fs is a copy of the source-fs from the past. Let's
  45  * call this point, the 'sync point'.
  46  *
  47  * - There is a changelog of all metadata operations that happened on
  48  * the filesystem since the 'sync point'.
  49  *
  50  * - lustre_rsync replicates all the operations saved in the changelog
  51  * on to the target filesystem to make it identical to the source.
  52  *
  53  * To facilitate replication, the lustre filesystem provides
  54  *    a) a way to get the current filesystem path of a given FID
  55  *    b) a way to open files by specifying its FID
  56  *
  57  * The changelog only has a limited amount of information.
  58  *  tfid - The FID of the target file
  59  *  pfid - The FID of the parent of the target file (at the time of
  60  *         the operation)
  61  *  sfid - The FID of the source file
  62  *  spfid - The FID of the parent of the source file
  63  *  name - The name of the target file (at the time of the operation), the name
  64  *         of the source file is appended (delimited with '\0') if this
  65  *         operation involves a source
  66  *
  67  * With just this information, it is not alwasy possible to determine
  68  * the file paths for each operation. For instance, if pfid does not
  69  * exist on the source-fs (due to a subsequent deletion), its path
  70  * cannot be queried. In such cases, lustre_rsync keeps the files in a
  71  * special directory ("/.lustrerepl"). Once all the operations in a
  72  * changelog are replayed, all the files in this special directory
  73  * will get moved to the location as in the source-fs.
  74  *
  75  * Shorthand used: f2p(fid) = fid2path(fid)
  76  *
  77  * The following are the metadata operations of interest.
  78  * 1. creat
  79  *    If tfid is absent on the source-fs, ignore this operation
  80  *    If pfid is absent on the source-fs [or]
  81  *    if f2p(pfid) is not present on target-fs [or]
  82  *    if f2p(pfid)+name != f2p(tfid)
  83  *      creat .lustrerepl/tfid
  84  *      track [pfid,tfid,name]
  85  *    Else
  86  *      creat f2p[tfid]
  87  *
  88  * 2. remove
  89  *    If .lustrerepl/[tfid] is present on the target
  90  *      rm .lustrerepl/[tfid]
  91  *    Else if pfid is present on the source-fs,
  92  *      if f2p(pfid)+name is present,
  93  *        rm f2p(pfid)+name
  94  *
  95  * 3. move (spfid,sname) to (pfid,name)
  96  *    If pfid is present
  97  *      if spfid is also present, mv (spfid,sname) to (pfid,name)
  98  *      else mv .lustrerepl/[sfid] to (pfid,name)
  99  *    Else if pfid is not present,
 100  *      if spfid is present, mv (spfid,sname) .lustrerepl/[sfid]
 101  *    If moving out of .lustrerepl
 102  *      move out all its children in .lustrerepl.
 103  *      [pfid,tfid,name] tracked from (1) is used for this.
 104  */
 105
 106 #include <assert.h>
 107 #include <stdio.h>
 108 #include <stdlib.h>
 109 #include <string.h>
 110 #include <unistd.h>
 111 #include <getopt.h>
 112 #include <stdarg.h>
 113 #include <fcntl.h>
 114 #include <signal.h>
 115 #include <sys/stat.h>
 116 #include <sys/types.h>
 117 #include <errno.h>
 118 #include <limits.h>
 119 #include <utime.h>
 120 #include <time.h>
 121 #include <sys/xattr.h>
 122 #include <linux/types.h>
 123
 124 #include <libcfs/util/string.h>
 125 #include <lustre/lustreapi.h>
 126 #include "lustre_rsync.h"
 127 #include "callvpe.h"
 128
 129 #define REPLICATE_STATUS_VER 1
 130 #define CLEAR_INTERVAL 100
 131 #define DEFAULT_RSYNC_THRESHOLD 0xA00000 /* 10 MB */
 132
 133 #define TYPE_STR_LEN 16
 134
 135 #define DEFAULT_MDT "-MDT0000"
 136 #define SPECIAL_DIR ".lustrerepl"
 137 #define RSYNC "rsync"
 138 #define TYPE "type"
 139
 140 /* Debug flags */
 141 #define DINFO 1
 142 #define DTRACE 2
 143
 144 /* Information for processing a changelog record. This structure is
 145    allocated on the heap instead of allocating large variables on the
 146    stack. */
 147 struct lr_info {
 148         long long recno;
 149         int target_no;
 150         unsigned int is_extended:1;
 151         enum changelog_rec_type type;
 152         char tfid[LR_FID_STR_LEN];
 153         char pfid[LR_FID_STR_LEN];
 154         char sfid[LR_FID_STR_LEN];
 155         char spfid[LR_FID_STR_LEN];
 156         char sname[NAME_MAX + 1];
 157         char name[NAME_MAX + 1];
 158         char src[3 * PATH_MAX + 1];
 159         char dest[3 * PATH_MAX + 1];
 160         char path[PATH_MAX + 1];
 161         char savedpath[PATH_MAX + 1];
 162         char link[PATH_MAX + 1];
 163         char linktmp[PATH_MAX + 1];
 164         int bufsize;
 165         char *buf;
 166
 167         /* Variables for querying the xattributes */
 168         char *xlist;
 169         size_t xsize;
 170         char *xvalue;
 171         size_t xvsize;
 172 };
 173
 174 struct lr_parent_child_list {
 175         struct lr_parent_child_log pc_log;
 176         struct lr_parent_child_list *pc_next;
 177 };
 178
 179 struct lustre_rsync_status *status;
 180 char *statuslog;  /* Name of the status log file */
 181 int logbackedup;
 182 int noxattr;    /* Flag to turn off replicating xattrs */
 183 int noclear;    /* Flag to turn off clearing changelogs */
 184 int debug;      /* Flag to turn debugging information on and off */
 185 int verbose;    /* Verbose output */
 186 long long rec_count; /* No of changelog records that were processed */
 187 int errors;
 188 int dryrun;
 189 int use_rsync;  /* Flag to turn on use of rsync to copy data */
 190 long long rsync_threshold = DEFAULT_RSYNC_THRESHOLD;
 191 int quit;       /* Flag to stop processing the changelog; set on the
 192                    receipt of a signal */
 193 int abort_on_err = 0;
 194
 195 char rsync[PATH_MAX + 128];
 196 char rsync_ver[PATH_MAX * 2];
 197 struct lr_parent_child_list *parents;
 198
 199 FILE *debug_log;
 200
 201 /* Command line options */
 202 struct option long_opts[] = {
 203         { .val = 'l',   .name = "statuslog",    .has_arg = required_argument },
 204         { .val = 'm',   .name = "mdt",          .has_arg = required_argument },
 205         { .val = 's',   .name = "source",       .has_arg = required_argument },
 206         { .val = 't',   .name = "target",       .has_arg = required_argument },
 207         { .val = 'u',   .name = "user",         .has_arg = required_argument },
 208         { .val = 'v',   .name = "verbose",      .has_arg = no_argument },
 209         { .val = 'x',   .name = "xattr",        .has_arg = required_argument },
 210         { .val = 'z',   .name = "dry-run",      .has_arg = no_argument },
 211         /* Undocumented options follow */
 212         { .val = 'a',   .name = "abort-on-err", .has_arg = no_argument },
 213         { .val = 'c',   .name = "cl-clear",     .has_arg = required_argument },
 214         { .val = 'd',   .name = "debug",        .has_arg = required_argument },
 215         { .val = 'D',   .name = "debuglog",     .has_arg = required_argument },
 216         { .val = 'n',   .name = "start-recno",  .has_arg = required_argument },
 217         { .val = 'r',   .name = "use-rsync",    .has_arg = no_argument },
 218         { .val = 'y',   .name = "rsync-threshold",
 219                                                 .has_arg = required_argument },
 220         { .name = NULL } };
 221
 222 /* Command line usage */
 223 void lr_usage()
 224 {
 225         fprintf(stderr, "\tlustre_rsync -s <lustre_root_path> -t <target_path> "
 226                 "-m <mdt> -r <user id> -l <status log>\n"
 227                 "lustre_rsync can also pick up parameters from a "
 228                 "status log created earlier.\n"
 229                 "\tlustre_rsync -l <log_file>\n"
 230                 "options:\n"
 231                 "\t--xattr <yes|no> replicate EAs\n"
 232                 "\t--abort-on-err   abort at first err\n"
 233                 "\t--verbose\n"
 234                 "\t--dry-run        don't write anything\n");
 235 }
 236
 237 /* Print debug information. This is controlled by the value of the
 238    global variable 'debug' */
 239 void lr_debug(int level, const char *fmt, ...)
 240 {
 241         va_list ap;
 242
 243         if (level > debug)
 244                 return;
 245
 246         va_start(ap, fmt);
 247         if (debug_log != NULL)
 248                 vfprintf(debug_log, fmt, ap);
 249         else
 250                 vfprintf(stdout, fmt, ap);
 251         va_end(ap);
 252 }
 253
 254
 255 void * lr_grow_buf(void *buf, int size)
 256 {
 257         void *ptr;
 258
 259         ptr = realloc(buf, size);
 260         if (ptr == NULL)
 261                 free(buf);
 262         return ptr;
 263 }
 264
 265
 266 /* Use rsync to replicate file data */
 267 int lr_rsync_data(struct lr_info *info)
 268 {
 269         struct stat st_src, st_dest;
 270         int rc;
 271
 272         lr_debug(DTRACE, "Syncing data%s\n", info->tfid);
 273
 274         rc = stat(info->src, &st_src);
 275         if (rc == -1) {
 276                 fprintf(stderr, "Error: Unable to stat src=%s %s\n",
 277                         info->src, info->name);
 278                 if (errno == ENOENT)
 279                         return 0;
 280                 else
 281                         return -errno;
 282         }
 283         rc = stat(info->dest, &st_dest);
 284         if (rc == -1) {
 285                 fprintf(stderr, "Error: Unable to stat dest=%s\n",
 286                         info->dest);
 287                 return -errno;
 288         }
 289
 290         if (st_src.st_mtime != st_dest.st_mtime ||
 291             st_src.st_size != st_dest.st_size) {
 292                 /* XXX spawning off an rsync for every data sync and
 293                  * waiting synchronously is bad for performance.
 294                  * librsync could possibly used here. But it does not
 295                  * seem to be of production grade. Multi-threaded
 296                  * replication is also to be considered.
 297                  */
 298                 char *args[] = {
 299                         rsync,
 300                         "--inplace",
 301                         "--",
 302                         info->src,
 303                         info->dest,
 304                         NULL,
 305                 };
 306                 extern char **environ;
 307                 int status;
 308
 309                 lr_debug(DTRACE, "\t%s %s %s %s %s %s\n", args[0], args[1],
 310                          args[2], args[3], args[4], info->tfid);
 311
 312                 status = callvpe(rsync, args, environ);
 313                 if (status < 0) {
 314                         rc = -errno;
 315                 } else if (WIFEXITED(status)) {
 316                         status = WEXITSTATUS(status);
 317                         if (!status)
 318                                 rc = 0;
 319                         else if (status == 23 || status == 24)
 320                                 /* Error due to vanished source files;
 321                                    Ignore this error*/
 322                                 rc = 0;
 323                         else
 324                                 rc = -EINVAL;
 325                         if (status)
 326                                 lr_debug(DINFO, "rsync %s exited with %d %d\n",
 327                                          info->src, status, rc);
 328                 } else {
 329                         rc = -EINTR;
 330                 }
 331         } else {
 332                 lr_debug(DTRACE, "Not syncing %s and %s %s\n", info->src,
 333                          info->dest, info->tfid);
 334         }
 335
 336         return rc;
 337 }
 338
 339 int lr_copy_data(struct lr_info *info)
 340 {
 341         int fd_src = -1;
 342         int fd_dest = -1;
 343         int bufsize;
 344         int rsize;
 345         int rc = 0;
 346         struct stat st_src;
 347         struct stat st_dest;
 348
 349         fd_src = open(info->src, O_RDONLY);
 350         if (fd_src == -1)
 351                 return -errno;
 352         if (fstat(fd_src, &st_src) == -1 ||
 353             stat(info->dest, &st_dest) == -1)
 354                 goto out;
 355
 356         if (st_src.st_mtime == st_dest.st_mtime &&
 357             st_src.st_size == st_dest.st_size)
 358                 goto out;
 359
 360         if (st_src.st_size > rsync_threshold && rsync[0] != '\0') {
 361                 /* It is more efficient to use rsync to replicate
 362                    large files. Any file larger than rsync_threshold
 363                    is handed off to rsync. */
 364                 lr_debug(DTRACE, "Using rsync to replicate %s\n", info->tfid);
 365                 rc = lr_rsync_data(info);
 366                 goto out;
 367         }
 368
 369         fd_dest = open(info->dest, O_WRONLY | O_TRUNC, st_src.st_mode);
 370         if (fd_dest == -1) {
 371                 rc = -errno;
 372                 goto out;
 373         }
 374         bufsize = st_dest.st_blksize;
 375
 376         if (info->bufsize < bufsize) {
 377                 /* Grow buffer */
 378                 info->buf = lr_grow_buf(info->buf, bufsize);
 379                 if (info->buf == NULL) {
 380                         rc = -ENOMEM;
 381                         goto out;
 382                 }
 383                 info->bufsize = bufsize;
 384         }
 385
 386         while (1) {
 387                 char *buf;
 388                 int wsize;
 389
 390                 buf = info->buf;
 391                 rsize = read(fd_src, buf, bufsize);
 392                 if (rsize == 0) {
 393                         rc = 0;
 394                         break;
 395                 }
 396                 if (rsize < 0) {
 397                         rc = -errno;
 398                         break;
 399                 }
 400                 do {
 401                         wsize = write(fd_dest, buf, rsize);
 402                         if (wsize <= 0) {
 403                                 rc = -errno;
 404                                 break;
 405                         }
 406                         rsize -= wsize;
 407                         buf += wsize;
 408                 } while (rsize > 0);
 409         }
 410         fsync(fd_dest);
 411
 412 out:
 413         if (fd_src != -1)
 414                 close(fd_src);
 415         if (fd_dest != -1)
 416                 close(fd_dest);
 417
 418         return rc;
 419 }
 420
 421 /* Copy data from source to destination */
 422 int lr_sync_data(struct lr_info *info)
 423 {
 424         if (use_rsync)
 425                 return lr_rsync_data(info);
 426         else
 427                 return lr_copy_data(info);
 428 }
 429
 430 /* Copy all attributes from file src to file dest */
 431 int lr_copy_attr(const char *src, const char *dest)
 432 {
 433         struct stat st;
 434         struct utimbuf time;
 435
 436         if (stat(src, &st) == -1 ||
 437             chmod(dest, st.st_mode) == -1 ||
 438             chown(dest, st.st_uid, st.st_gid) == -1)
 439                 return -errno;
 440
 441         time.actime = st.st_atime;
 442         time.modtime = st.st_mtime;
 443         if (utime(dest, &time) == -1)
 444                 return -errno;
 445         return 0;
 446 }
 447
 448 /* Copy all xattrs from file info->src to info->dest */
 449 int lr_copy_xattr(struct lr_info *info)
 450 {
 451         size_t size = info->xsize;
 452         int start;
 453         int len;
 454         int rc;
 455
 456         if (noxattr)
 457                 return 0;
 458
 459         errno = 0;
 460         rc = llistxattr(info->src, info->xlist, size);
 461         lr_debug(DTRACE, "llistxattr(%s,%p) returned %d, errno=%d\n",
 462                  info->src, info->xlist, rc, errno);
 463         if ((rc > 0 && info->xlist == NULL) || errno == ERANGE) {
 464                 size = rc > PATH_MAX ? rc : PATH_MAX;
 465                 info->xlist = lr_grow_buf(info->xlist, size);
 466                 if (info->xlist == NULL)
 467                         return -ENOMEM;
 468                 info->xsize = size;
 469                 rc = llistxattr(info->src, info->xlist, size);
 470                 lr_debug(DTRACE, "llistxattr %s returned %d, errno=%d\n",
 471                          info->src, rc, errno);
 472         }
 473         if (rc < 0)
 474                 return rc;
 475
 476         len = rc;
 477         start = 0;
 478         while (start < len) {
 479                 size = info->xvsize;
 480                 rc = lgetxattr(info->src, info->xlist + start,
 481                                info->xvalue, size);
 482                 if (info->xvalue == NULL || errno == ERANGE) {
 483                         size = rc > PATH_MAX ? rc : PATH_MAX;
 484                         info->xvalue = lr_grow_buf(info->xvalue, size);
 485                         if (info->xvalue == NULL)
 486                                 return -ENOMEM;
 487                         info->xvsize = size;
 488                         rc = lgetxattr(info->src, info->xlist + start,
 489                                        info->xvalue, size);
 490                 }
 491                 lr_debug(DTRACE, "\t(%s,%d) rc=%p\n", info->xlist + start,
 492                          info->xvalue, rc);
 493                 if (rc > 0) {
 494                         size = rc;
 495                         rc = lsetxattr(info->dest, info->xlist + start,
 496                                        info->xvalue, size, 0);
 497                         lr_debug(DTRACE, "\tlsetxattr(), rc=%d, errno=%d\n",
 498                                  rc, errno);
 499                         if (rc == -1) {
 500                                 if (errno != ENOTSUP) {
 501                                         fprintf(stderr,
 502                         "cannot replicate xattrs from '%s' to '%s': %s\n",
 503                                                 info->src, info->dest,
 504                                                 strerror(errno));
 505                                         errors++;
 506                                 }
 507                                 rc = 0;
 508                         }
 509                 }
 510                 start += strlen(info->xlist + start) + 1;
 511         }
 512
 513         lr_debug(DINFO, "setxattr: %s %s\n", info->src, info->dest);
 514
 515         return rc;
 516 }
 517
 518 /* Retrieve the filesystem path for a given FID and a given
 519    linkno. The path is returned in info->path */
 520 int lr_get_path_ln(struct lr_info *info, char *fidstr, int linkno)
 521 {
 522         long long recno = -1;
 523         int rc;
 524
 525         rc = llapi_fid2path(status->ls_source, fidstr, info->path,
 526                             PATH_MAX, &recno, &linkno);
 527         if (rc < 0 && rc != -ENOENT) {
 528                 fprintf(stderr, "fid2path error: (%s, %s) %d %s\n",
 529                         status->ls_source, fidstr, -rc, strerror(errno = -rc));
 530         }
 531
 532         return rc;
 533 }
 534
 535 /* Retrieve the filesystem path for a given FID. The path is returned
 536    in info->path */
 537 int lr_get_path(struct lr_info *info, char *fidstr)
 538 {
 539         return lr_get_path_ln(info, fidstr, 0);
 540 }
 541
 542 /* Generate the path for opening by FID */
 543 void lr_get_FID_PATH(char *mntpt, char *fidstr, char *buf, int bufsize)
 544 {
 545         /* Open-by-FID path is <mntpt>/.lustre/fid/[SEQ:OID:VER] */
 546         snprintf(buf, bufsize, "%s/%s/fid/%s", mntpt, dot_lustre_name,
 547                  fidstr);
 548 }
 549
 550 /* Read the symlink information into 'info->link' */
 551 int lr_get_symlink(struct lr_info *info)
 552 {
 553         int rc;
 554         char *link;
 555
 556         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
 557         rc = readlink(info->src, info->linktmp, PATH_MAX);
 558         if (rc > 0)
 559                 info->linktmp[rc] = '\0';
 560         else
 561                 return rc;
 562         lr_debug(DTRACE, "symlink: readlink returned %s\n", info->linktmp);
 563
 564         if (strncmp(info->linktmp, status->ls_source,
 565                     strlen(status->ls_source)) == 0) {
 566                 /* Strip source fs path and replace with target fs path. */
 567                 link = info->linktmp + strlen(status->ls_source);
 568                 snprintf(info->src, sizeof(info->src), "%s%s",
 569                          status->ls_targets[info->target_no], link);
 570                 link = info->src;
 571         } else {
 572                 link = info->linktmp;
 573         }
 574         rc = snprintf(info->link, sizeof(info->link), "%s", link);
 575         if (rc >= sizeof(info->link))
 576                 rc = -E2BIG;
 577         return rc;
 578 }
 579
 580 /* Create file/directory/device file/symlink. */
 581 int lr_mkfile(struct lr_info *info)
 582 {
 583         struct stat st;
 584         int rc = 0;
 585
 586         errno = 0;
 587         lr_debug(DINFO, "mkfile(%d) %s \n", info->type, info->dest);
 588         if (info->type == CL_MKDIR) {
 589                 rc = mkdir(info->dest, 0777);
 590         } else if (info->type == CL_SOFTLINK) {
 591                 lr_get_symlink(info);
 592                 rc = symlink(info->link, info->dest);
 593         } else if (info->type == CL_MKNOD) {
 594                 lr_get_FID_PATH(status->ls_source, info->tfid,
 595                                     info->src, PATH_MAX);
 596                 rc = stat(info->src, &st);
 597                 if (rc == -1) {
 598                         if (errno == ENOENT)
 599                                 return 0;
 600                         else
 601                                 return -errno;
 602                 }
 603                 rc = mknod(info->dest, st.st_mode, st.st_rdev);
 604         } else {
 605                 rc = mknod(info->dest, S_IFREG | 0777, 0);
 606         }
 607
 608         if (rc < 0) {
 609                 if (errno == EEXIST)
 610                         rc = 0;
 611                 else
 612                         return -errno;
 613         }
 614
 615         /* Sync data and attributes */
 616         if (info->type == CL_CREATE || info->type == CL_MKDIR) {
 617                 lr_debug(DTRACE, "Syncing data and attributes %s\n",
 618                          info->tfid);
 619                 (void) lr_copy_xattr(info);
 620                 if (info->type == CL_CREATE)
 621                         rc = lr_sync_data(info);
 622                 if (!rc)
 623                         rc = lr_copy_attr(info->src, info->dest);
 624
 625                 if (rc == -ENOENT)
 626                         /* Source file has disappeared. Not an error. */
 627                         rc = 0;
 628         } else {
 629                 lr_debug(DTRACE, "Not syncing data and attributes %s\n",
 630                          info->tfid);
 631         }
 632
 633         return rc;
 634 }
 635
 636 int lr_add_pc(const char *pfid, const char *tfid, const char *name)
 637 {
 638         struct lr_parent_child_list *p;
 639         size_t len;
 640
 641         p = calloc(1, sizeof(*p));
 642         if (p == NULL)
 643                 return -ENOMEM;
 644         len = snprintf(p->pc_log.pcl_pfid, sizeof(p->pc_log.pcl_pfid),
 645                        "%s", pfid);
 646         if (len >= sizeof(p->pc_log.pcl_pfid))
 647                 goto out_err;
 648         len = snprintf(p->pc_log.pcl_tfid, sizeof(p->pc_log.pcl_tfid),
 649                        "%s", tfid);
 650         if (len >= sizeof(p->pc_log.pcl_tfid))
 651                 goto out_err;
 652         len = snprintf(p->pc_log.pcl_name, sizeof(p->pc_log.pcl_name),
 653                        "%s", name);
 654         if (len >= sizeof(p->pc_log.pcl_name))
 655                 goto out_err;
 656
 657         p->pc_next = parents;
 658         parents = p;
 659         return 0;
 660
 661 out_err:
 662         free(p);
 663         return -E2BIG;
 664 }
 665
 666 void lr_cascade_move(const char *fid, const char *dest, struct lr_info *info)
 667 {
 668         struct lr_parent_child_list *curr, *prev;
 669         char d[4 * PATH_MAX + 1];
 670         int rc;
 671
 672         prev = curr = parents;
 673         while (curr) {
 674                 if (strcmp(curr->pc_log.pcl_pfid, fid) == 0) {
 675                         if (snprintf(d, sizeof(d), "%s/%s", dest,
 676                                      curr->pc_log.pcl_name) >= sizeof(d)) {
 677                                 fprintf(stderr, "Buffer truncated\n");
 678                                 return;
 679                         }
 680                         if (snprintf(info->src, sizeof(info->src), "%s/%s/%s",
 681                                      status->ls_targets[info->target_no],
 682                                      SPECIAL_DIR, curr->pc_log.pcl_tfid) >=
 683                             sizeof(info->src))
 684                                 return;
 685                         rc = rename(info->src, d);
 686                         if (rc == -1) {
 687                                 fprintf(stderr, "Error renaming file "
 688                                         " %s to %s: %d\n",
 689                                         info->src, d, errno);
 690                                 errors++;
 691                         }
 692                         if (curr == parents)
 693                                 parents = curr->pc_next;
 694                         else
 695                                 prev->pc_next = curr->pc_next;
 696                         lr_cascade_move(curr->pc_log.pcl_tfid, d, info);
 697                         free(curr);
 698                         prev = curr = parents;
 699
 700                 } else {
 701                         prev = curr;
 702                         curr = curr->pc_next;
 703                 }
 704         }
 705 }
 706
 707 /* remove [info->spfid, info->sfid] from parents */
 708 int lr_remove_pc(const char *pfid, const char *tfid)
 709 {
 710         struct lr_parent_child_list *curr, *prev;
 711
 712         for (prev = curr = parents; curr; prev = curr, curr = curr->pc_next) {
 713                 if (strcmp(curr->pc_log.pcl_pfid, pfid) == 0 &&
 714                     strcmp(curr->pc_log.pcl_tfid, tfid) == 0) {
 715                         if (curr == parents)
 716                                 parents = curr->pc_next;
 717                         else
 718                                 prev->pc_next = curr->pc_next;
 719                         free(curr);
 720                         break;
 721                 }
 722         }
 723         return 0;
 724 }
 725
 726 /* Create file under SPECIAL_DIR with its tfid as its name. */
 727 int lr_mk_special(struct lr_info *info)
 728 {
 729         int rc;
 730
 731         snprintf(info->dest, sizeof(info->dest), "%s/%s/%s",
 732                 status->ls_targets[info->target_no], SPECIAL_DIR,
 733                 info->tfid);
 734
 735         rc = lr_mkfile(info);
 736         if (rc)
 737                 return rc;
 738
 739         rc = lr_add_pc(info->pfid, info->tfid, info->name);
 740         return rc;
 741 }
 742
 743 /* Remove a file or directory */
 744 int lr_rmfile(struct lr_info *info)
 745 {
 746         int rc;
 747
 748         if (info->type == CL_RMDIR)
 749                 rc = rmdir(info->dest);
 750         else
 751                 rc = unlink(info->dest);
 752         if (rc == -1)
 753                 rc = -errno;
 754         return rc;
 755 }
 756
 757 /* Recursively remove directory and its contents */
 758 int lr_rm_recursive(struct lr_info *info)
 759 {
 760         char *args[] = {
 761                 "rm",
 762                 "-rf",
 763                 "--",
 764                 info->dest,
 765                 NULL,
 766         };
 767         extern char **environ;
 768         int status;
 769         int rc;
 770
 771         status = callvpe("/bin/rm", args, environ);
 772         if (status < 0)
 773                 rc = -errno;
 774         else if (WIFEXITED(status))
 775                 rc = WEXITSTATUS(status) == 0 ? 0 : -EINVAL;
 776         else
 777                 rc = -EINTR;
 778
 779         return rc;
 780 }
 781
 782 /* Remove a file under SPECIAL_DIR with its tfid as its name. */
 783 int lr_rm_special(struct lr_info *info)
 784 {
 785         int rc;
 786
 787         snprintf(info->dest, sizeof(info->dest), "%s/%s/%s",
 788                  status->ls_targets[info->target_no], SPECIAL_DIR,
 789                  info->tfid);
 790         rc = lr_rmfile(info);
 791
 792         if (rc)
 793                 lr_debug(DINFO, "remove: %s; rc=%d, errno=%d\n",
 794                          info->dest, rc, errno);
 795         return rc;
 796 }
 797
 798 /* Replicate file and directory create events */
 799 int lr_create(struct lr_info *info)
 800 {
 801         int len;
 802         int rc1 = 0;
 803         int rc;
 804         int mkspecial = 0;
 805
 806         /* Is target FID present on the source? */
 807         rc = lr_get_path(info, info->tfid);
 808         if (rc == -ENOENT) {
 809                 /* Source file has disappeared. Not an error. */
 810                 lr_debug(DINFO, "create: tfid %s not found on"
 811                          "source-fs\n", info->tfid);
 812                 return 0;
 813         } else if (rc) {
 814                 return rc;
 815         }
 816         strcpy(info->savedpath, info->path);
 817
 818         /* Is parent FID present on the source */
 819         rc = lr_get_path(info, info->pfid);
 820         if (rc == -ENOENT) {
 821                 lr_debug(DINFO, "create: pfid %s not found on source-fs\n",
 822                          info->tfid);
 823                 mkspecial = 1;
 824         } else if (rc < 0) {
 825                 return rc;
 826         }
 827
 828         /* Is f2p(pfid)+name != f2p(tfid)? If not the file has moved. */
 829         len = strlen(info->path);
 830         if (len == 1 && info->path[0] == '/')
 831                 snprintf(info->dest, sizeof(info->dest), "%s", info->name);
 832         else if (len - 1 > 0 && info->path[len - 1] == '/')
 833                 snprintf(info->dest, sizeof(info->dest), "%s%s", info->path,
 834                          info->name);
 835         else
 836                 snprintf(info->dest, sizeof(info->dest), "%s/%s", info->path,
 837                          info->name);
 838
 839         lr_debug(DTRACE, "dest = %s; savedpath = %s\n", info->dest,
 840                  info->savedpath);
 841         if (strncmp(info->dest, info->savedpath, PATH_MAX) != 0) {
 842                 lr_debug(DTRACE, "create: file moved (%s). %s != %s\n",
 843                          info->tfid, info->dest, info->savedpath);
 844                 mkspecial = 1;
 845         }
 846
 847         /* Is f2p(pfid) present on the target? If not, the parent has
 848            moved */
 849         if (!mkspecial) {
 850                 snprintf(info->dest, sizeof(info->dest), "%s/%s",
 851                          status->ls_targets[0], info->path);
 852                 if (access(info->dest, F_OK) != 0) {
 853                         lr_debug(DTRACE, "create: parent %s not found\n",
 854                                 info->dest);
 855                         mkspecial = 1;
 856                 }
 857         }
 858         for (info->target_no = 0; info->target_no < status->ls_num_targets;
 859              info->target_no++) {
 860                 snprintf(info->dest, sizeof(info->dest), "%s/%s",
 861                         status->ls_targets[info->target_no], info->savedpath);
 862                 lr_get_FID_PATH(status->ls_source, info->tfid, info->src,
 863                                 PATH_MAX);
 864
 865                 if (!mkspecial)
 866                         rc1 = lr_mkfile(info);
 867                 if (mkspecial || rc1 == -ENOENT) {
 868                         rc1 = lr_mk_special(info);
 869                 }
 870                 if (rc1)
 871                         rc = rc1;
 872         }
 873         return rc;
 874 }
 875
 876 /* Replicate a file remove (rmdir/unlink) operation */
 877 int lr_remove(struct lr_info *info)
 878 {
 879         int rc = 0;
 880         int rc1;
 881
 882         for (info->target_no = 0; info->target_no < status->ls_num_targets;
 883              info->target_no++) {
 884
 885                 rc1 = lr_rm_special(info);
 886                 if (!rc1)
 887                         continue;
 888
 889                 rc1 = lr_get_path(info, info->pfid);
 890                 if (rc1 == -ENOENT) {
 891                         lr_debug(DINFO, "remove: pfid %s not found\n",
 892                                  info->pfid);
 893                         continue;
 894                 }
 895                 if (rc1) {
 896                         rc = rc1;
 897                         continue;
 898                 }
 899                 snprintf(info->dest, sizeof(info->dest), "%s/%s/%s",
 900                         status->ls_targets[info->target_no], info->path,
 901                         info->name);
 902
 903                 rc1 = lr_rmfile(info);
 904                 lr_debug(DINFO, "remove: %s; rc1=%d, errno=%d\n",
 905                          info->dest, rc1, errno);
 906                 if (rc1 == -ENOTEMPTY)
 907                         rc1 = lr_rm_recursive(info);
 908
 909                 if (rc1) {
 910                         rc = rc1;
 911                         continue;
 912                 }
 913         }
 914         return rc;
 915 }
 916
 917 /* Replicate a rename/move operation. */
 918 int lr_move(struct lr_info *info)
 919 {
 920         int rc = 0;
 921         int rc1;
 922         int rc_dest, rc_src;
 923         int special_src = 0;
 924         int special_dest = 0;
 925         char srcpath[PATH_MAX + 1] = "";
 926
 927         assert(info->is_extended);
 928
 929         rc_src = lr_get_path(info, info->spfid);
 930         if (rc_src < 0 && rc_src != -ENOENT)
 931                 return rc_src;
 932         memcpy(srcpath, info->path, strlen(info->path));
 933
 934         rc_dest = lr_get_path(info, info->pfid);
 935         if (rc_dest < 0 && rc_dest != -ENOENT)
 936                 return rc_dest;
 937
 938         for (info->target_no = 0; info->target_no < status->ls_num_targets;
 939              info->target_no++) {
 940
 941                 if (!rc_dest) {
 942                         snprintf(info->dest, sizeof(info->dest), "%s/%s",
 943                                 status->ls_targets[info->target_no],
 944                                 info->path);
 945                         if (access(info->dest, F_OK) != 0) {
 946                                 rc_dest = -errno;
 947                         } else {
 948                                 snprintf(info->dest, sizeof(info->dest),
 949                                          "%s/%s/%s",
 950                                          status->ls_targets[info->target_no],
 951                                          info->path, info->name);
 952                         }
 953                         lr_debug(DINFO, "dest path %s rc_dest=%d\n", info->dest,
 954                                  rc_dest);
 955                 }
 956                 if (rc_dest == -ENOENT) {
 957                         snprintf(info->dest, sizeof(info->dest), "%s/%s/%s",
 958                                 status->ls_targets[info->target_no],
 959                                 SPECIAL_DIR, info->sfid);
 960                         special_dest = 1;
 961                         lr_debug(DINFO, "special dest %s\n", info->dest);
 962                 }
 963
 964                 if (!rc_src) {
 965                         snprintf(info->src, sizeof(info->src), "%s/%s/%s",
 966                                 status->ls_targets[info->target_no],
 967                                 srcpath, info->sname);
 968                         lr_debug(DINFO, "src path %s rc_src=%d\n", info->src,
 969                                  rc_src);
 970                 }
 971                 if (rc_src == -ENOENT || (access(info->src, F_OK) != 0 &&
 972                                           errno == ENOENT)) {
 973                         snprintf(info->src, sizeof(info->src), "%s/%s/%s",
 974                                 status->ls_targets[info->target_no],
 975                                 SPECIAL_DIR, info->sfid);
 976                         special_src = 1;
 977                         lr_debug(DINFO, "special src %s\n", info->src);
 978                 }
 979
 980                 rc1 = 0;
 981                 errno = 0;
 982                 if (strcmp(info->src, info->dest) != 0) {
 983                         rc1 = rename(info->src, info->dest);
 984                         if (rc1 == -1)
 985                                 rc1 = -errno;
 986                         lr_debug(DINFO, "rename returns %d\n", rc1);
 987                 }
 988
 989                 if (special_src)
 990                         rc1 = lr_remove_pc(info->spfid, info->sfid);
 991
 992                 if (!special_dest)
 993                         lr_cascade_move(info->sfid, info->dest, info);
 994                 else
 995                         rc1 = lr_add_pc(info->pfid, info->sfid, info->name);
 996
 997                 lr_debug(DINFO, "move: %s [to] %s rc1=%d, errno=%d\n",
 998                          info->src, info->dest, rc1, errno);
 999                 if (rc1)
1000                         rc = rc1;
1001         }
1002         return rc;
1003 }
1004
1005 /* Replicate a hard link */
1006 int lr_link(struct lr_info *info)
1007 {
1008         int i;
1009         int rc;
1010         int rc1;
1011         struct stat st;
1012
1013         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
1014         rc = stat(info->src, &st);
1015         if (rc == -1)
1016                 return -errno;
1017
1018         for (info->target_no = 0; info->target_no < status->ls_num_targets;
1019              info->target_no++) {
1020
1021                 info->src[0] = 0;
1022                 info->dest[0] = 0;
1023                 rc1 = 0;
1024
1025                 /*
1026                  * The changelog record has the new parent directory FID and
1027                  * name of the target file. So info->dest can be constructed
1028                  * by getting the path of the new parent directory and
1029                  * appending the target file name.
1030                  */
1031                 rc1 = lr_get_path(info, info->pfid);
1032                 lr_debug(rc1 ? 0 : DTRACE, "\tparent fid2path %s, %s, rc=%d\n",
1033                          info->path, info->name, rc1);
1034
1035                 if (rc1 == 0) {
1036                         snprintf(info->dest, sizeof(info->dest), "%s/%s/%s",
1037                                  status->ls_targets[info->target_no],
1038                                  info->path, info->name);
1039                         lr_debug(DINFO, "link destination is %s\n", info->dest);
1040                 }
1041
1042                 /* Search through the hardlinks to get the src */
1043                 for (i = 0; i < st.st_nlink && info->src[0] == 0; i++) {
1044                         size_t len;
1045
1046                         rc1 = lr_get_path_ln(info, info->tfid, i);
1047                         lr_debug(rc1 ? 0:DTRACE, "\tfid2path %s, %s, %d rc=%d\n",
1048                                  info->path, info->name, i, rc1);
1049                         if (rc1)
1050                                 break;
1051
1052                         /*
1053                          * Compare the path of target FID with info->dest
1054                          * to find out info->src.
1055                          */
1056                         len = sizeof(status->ls_targets[info->target_no]) +
1057                               sizeof(info->path);
1058                         char srcpath[len + 1];
1059
1060                         snprintf(srcpath, sizeof(srcpath), "%s/%s",
1061                                  status->ls_targets[info->target_no],
1062                                  info->path);
1063
1064                         if (strcmp(srcpath, info->dest) != 0) {
1065                                 snprintf(info->src, sizeof(info->src), "%s",
1066                                          srcpath);
1067                                 lr_debug(DINFO, "link source is %s\n",
1068                                          info->src);
1069                         }
1070                 }
1071
1072                 if (rc1) {
1073                         rc = rc1;
1074                         continue;
1075                 }
1076
1077                 if (info->src[0] == 0)
1078                         snprintf(info->src, sizeof(info->src), "%s/%s/%s",
1079                                 status->ls_targets[info->target_no],
1080                                 SPECIAL_DIR, info->tfid);
1081                 else if (info->dest[0] == 0)
1082                         snprintf(info->dest, sizeof(info->dest), "%s/%s/%s",
1083                                 status->ls_targets[info->target_no],
1084                                 SPECIAL_DIR, info->tfid);
1085
1086                 rc1 = link(info->src, info->dest);
1087                 lr_debug(DINFO, "link: %s [to] %s; rc1=%d %s\n",
1088                          info->src, info->dest, rc1,
1089                          strerror(rc1 ? errno : 0));
1090
1091                 if (rc1)
1092                         rc = rc1;
1093         }
1094         return rc;
1095 }
1096
1097 int lr_set_dest_for_attr(struct lr_info *info)
1098 {
1099         int rc;
1100
1101         snprintf(info->dest, sizeof(info->dest), "%s/%s",
1102                  status->ls_targets[info->target_no], info->path);
1103         rc = access(info->dest, F_OK);
1104         if (rc < 0)
1105                 rc = -errno;
1106
1107         if (rc != -ENOENT)
1108                 return rc;
1109
1110         snprintf(info->dest, sizeof(info->dest), "%s/%s/%s",
1111                  status->ls_targets[info->target_no], SPECIAL_DIR,
1112                  info->tfid);
1113
1114         rc = access(info->dest, F_OK);
1115         if (rc < 0)
1116                 return -errno;
1117
1118         return 0;
1119 }
1120
1121 /* Replicate file attributes */
1122 int lr_setattr(struct lr_info *info)
1123 {
1124         int rc1;
1125         int rc;
1126
1127         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
1128
1129         rc = lr_get_path(info, info->tfid);
1130         if (rc == -ENOENT)
1131                 lr_debug(DINFO, "setattr: %s not present on source-fs\n",
1132                          info->src);
1133         if (rc)
1134                 return rc;
1135
1136         for (info->target_no = 0; info->target_no < status->ls_num_targets;
1137              info->target_no++) {
1138                 rc = lr_set_dest_for_attr(info);
1139                 if (rc < 0)
1140                         continue;
1141
1142                 lr_debug(DINFO, "setattr: %s %s %s", info->src, info->dest,
1143                          info->tfid);
1144
1145                 rc1 = lr_sync_data(info);
1146                 if (!rc1)
1147                         rc1 = lr_copy_attr(info->src, info->dest);
1148                 if (rc1)
1149                         rc = rc1;
1150         }
1151         return rc;
1152 }
1153
1154 /* Replicate xattrs */
1155 int lr_setxattr(struct lr_info *info)
1156 {
1157         int rc, rc1;
1158
1159         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
1160
1161         rc = lr_get_path(info, info->tfid);
1162         if (rc == -ENOENT)
1163                 lr_debug(DINFO, "setxattr: %s not present on source-fs\n",
1164                          info->src);
1165         if (rc)
1166                 return rc;
1167
1168         for (info->target_no = 0; info->target_no < status->ls_num_targets;
1169              info->target_no++) {
1170                 rc = lr_set_dest_for_attr(info);
1171                 if (rc < 0)
1172                         continue;
1173
1174                 lr_debug(DINFO, "setxattr: %s %s %s\n", info->src, info->dest,
1175                          info->tfid);
1176
1177                 rc1 = lr_copy_xattr(info);
1178                 if (rc1)
1179                         rc = rc1;
1180         }
1181
1182         return rc;
1183 }
1184
1185 /* Parse a line of changelog entry */
1186 int lr_parse_line(void *priv, struct lr_info *info)
1187 {
1188         struct changelog_rec            *rec;
1189         struct changelog_ext_rename     *rnm;
1190         size_t                           namelen;
1191         size_t                           copylen = sizeof(info->name);
1192
1193         if (llapi_changelog_recv(priv, &rec) != 0)
1194                 return -1;
1195
1196         info->is_extended = !!(rec->cr_flags & CLF_RENAME);
1197         info->recno = rec->cr_index;
1198         info->type = rec->cr_type;
1199         snprintf(info->tfid, sizeof(info->tfid), DFID, PFID(&rec->cr_tfid));
1200         snprintf(info->pfid, sizeof(info->pfid), DFID, PFID(&rec->cr_pfid));
1201
1202         namelen = strnlen(changelog_rec_name(rec), rec->cr_namelen);
1203         if (copylen > namelen + 1)
1204                 copylen = namelen + 1;
1205         snprintf(info->name, copylen, "%s", changelog_rec_name(rec));
1206
1207         /* Don't use rnm if CLF_RENAME isn't set */
1208         rnm = changelog_rec_rename(rec);
1209         if (rec->cr_flags & CLF_RENAME && !fid_is_zero(&rnm->cr_sfid)) {
1210                 copylen = sizeof(info->sname);
1211
1212                 snprintf(info->sfid, sizeof(info->sfid), DFID,
1213                          PFID(&rnm->cr_sfid));
1214                 snprintf(info->spfid, sizeof(info->spfid), DFID,
1215                          PFID(&rnm->cr_spfid));
1216                 namelen = changelog_rec_snamelen(rec);
1217                 if (copylen > namelen + 1)
1218                         copylen = namelen + 1;
1219                 snprintf(info->sname, copylen, "%s", changelog_rec_sname(rec));
1220
1221                 if (verbose > 1)
1222                         printf("Rec %lld: %d %s %s\n", info->recno, info->type,
1223                                 info->name, info->sname);
1224         } else {
1225                 if (verbose > 1)
1226                         printf("Rec %lld: %d %s\n", info->recno, info->type,
1227                                 info->name);
1228         }
1229
1230         llapi_changelog_free(&rec);
1231
1232         rec_count++;
1233         return 0;
1234 }
1235
1236 /* Initialize the replication parameters */
1237 int lr_init_status()
1238 {
1239         size_t size = sizeof(struct lustre_rsync_status) + PATH_MAX + 1;
1240
1241         if (status != NULL)
1242                 return 0;
1243         status = calloc(size, 1);
1244         if (status == NULL)
1245                 return -ENOMEM;
1246         status->ls_version = REPLICATE_STATUS_VER;
1247         status->ls_size = size;
1248         status->ls_last_recno = -1;
1249         return 0;
1250 }
1251
1252 /* Make a backup of the statuslog */
1253 void lr_backup_log()
1254 {
1255         char backupfile[PATH_MAX];
1256
1257         if (logbackedup)
1258                 return;
1259         snprintf(backupfile, sizeof(backupfile), "%s.old", statuslog);
1260         (void) rename(statuslog, backupfile);
1261         logbackedup = 1;
1262 }
1263
1264 /* Save replication parameters to a statuslog. */
1265 int lr_write_log()
1266 {
1267         int fd;
1268         size_t size;
1269         size_t write_size = status->ls_size;
1270         struct lr_parent_child_list *curr;
1271         int rc = 0;
1272
1273         if (statuslog == NULL)
1274                 return 0;
1275
1276         lr_backup_log();
1277
1278         fd = open(statuslog, O_WRONLY | O_CREAT | O_SYNC,
1279                              S_IRUSR | S_IWUSR);
1280         if (fd == -1) {
1281                 fprintf(stderr, "Error opening log file for writing (%s)\n",
1282                         statuslog);
1283                 return -1;
1284         }
1285         errno = 0;
1286         size = write(fd, status, write_size);
1287         if (size != write_size) {
1288                 fprintf(stderr, "Error writing to log file (%s) %d\n",
1289                         statuslog, errno);
1290                 close(fd);
1291                 return -1;
1292         }
1293
1294         for (curr = parents; curr; curr = curr->pc_next) {
1295                 size = write(fd, &curr->pc_log, sizeof(curr->pc_log));
1296                 if (size != sizeof(curr->pc_log)) {
1297                         fprintf(stderr, "Error writing to log file (%s) %d\n",
1298                                 statuslog, errno);
1299                         rc = -1;
1300                         break;
1301                 }
1302         }
1303         close(fd);
1304         return rc;
1305 }
1306
1307 /* Read statuslog and populate the replication parameters.  Command
1308  * line parameters take precedence over parameters in the log file.*/
1309 int lr_read_log()
1310 {
1311         struct lr_parent_child_list *tmp;
1312         struct lr_parent_child_log rec;
1313         struct lustre_rsync_status *s;
1314         int fd = -1;
1315         size_t size;
1316         size_t read_size = sizeof(struct lustre_rsync_status) + PATH_MAX + 1;
1317         int rc = 0;
1318
1319         if (statuslog == NULL)
1320                 return 0;
1321
1322         s = calloc(1, read_size);
1323         if (s == NULL) {
1324                 rc = -ENOMEM;
1325                 goto out;
1326         }
1327
1328         fd = open(statuslog, O_RDONLY);
1329         if (fd == -1) {
1330                 rc = -errno;
1331                 goto out;
1332         }
1333
1334         size = read(fd, s, read_size);
1335         if (size != read_size) {
1336                 rc = -EINVAL;
1337                 goto out;
1338         }
1339
1340         if (read_size < s->ls_size) {
1341                 read_size = s->ls_size;
1342                 s = lr_grow_buf(s, read_size);
1343                 if (s == NULL) {
1344                         rc = -ENOMEM;
1345                         goto out;
1346                 }
1347
1348                 if (lseek(fd, 0, SEEK_SET) == -1) {
1349                         rc = -ENOMEM;
1350                         goto out;
1351                 }
1352
1353                 size = read(fd, s, read_size);
1354                 if (size != read_size) {
1355                         rc = -EINVAL;
1356                         goto out;
1357                 }
1358         }
1359
1360         while (read(fd, &rec, sizeof(rec)) != 0) {
1361                 tmp = calloc(1, sizeof(*tmp));
1362                 if (!tmp) {
1363                         rc = -ENOMEM;
1364                         goto out;
1365                 }
1366
1367                 tmp->pc_log = rec;
1368                 tmp->pc_next = parents;
1369                 parents = tmp;
1370         }
1371
1372         /* copy uninitialized fields to status */
1373         if (status->ls_num_targets == 0) {
1374                 if (status->ls_size != s->ls_size) {
1375                         status = lr_grow_buf(status, s->ls_size);
1376                         if (status == NULL) {
1377                                 rc = -ENOMEM;
1378                                 goto out;
1379                         }
1380
1381                         status->ls_size = s->ls_size;
1382                 }
1383                 status->ls_num_targets = s->ls_num_targets;
1384                 memcpy(status->ls_targets, s->ls_targets,
1385                        (PATH_MAX + 1) * s->ls_num_targets);
1386         }
1387         if (status->ls_last_recno == -1)
1388                 status->ls_last_recno = s->ls_last_recno;
1389
1390         if (status->ls_registration[0] == '\0')
1391                 snprintf(status->ls_registration,
1392                          sizeof(status->ls_registration), "%s",
1393                          s->ls_registration);
1394
1395         if (status->ls_mdt_device[0] == '\0')
1396                 snprintf(status->ls_mdt_device,
1397                          sizeof(status->ls_mdt_device), "%s",
1398                          s->ls_mdt_device);
1399
1400         if (status->ls_source_fs[0] == '\0')
1401                 snprintf(status->ls_source_fs,
1402                          sizeof(status->ls_source_fs), "%s",
1403                          s->ls_source_fs);
1404
1405         if (status->ls_source[0] == '\0')
1406                 snprintf(status->ls_source,
1407                          sizeof(status->ls_source), "%s",
1408                          s->ls_source);
1409
1410  out:
1411         if (fd != -1)
1412                 close(fd);
1413         if (s)
1414                 free(s);
1415         return rc;
1416 }
1417
1418 /* Clear changelogs every CLEAR_INTERVAL records or at the end of
1419    processing. */
1420 int lr_clear_cl(struct lr_info *info, int force)
1421 {
1422         char            mdt_device[LR_NAME_MAXLEN + 1];
1423         int             rc = 0;
1424
1425         if (force || info->recno > status->ls_last_recno + CLEAR_INTERVAL) {
1426                 if (!noclear && !dryrun) {
1427                         /* llapi_changelog_clear modifies the mdt
1428                          * device name so make a copy of it until this
1429                          * is fixed.
1430                          */
1431                         snprintf(mdt_device, sizeof(mdt_device), "%s",
1432                                  status->ls_mdt_device);
1433                         rc = llapi_changelog_clear(mdt_device,
1434                                                    status->ls_registration,
1435                                                    info->recno);
1436                         if (rc)
1437                                 printf("Changelog clear (%s, %s, %lld) "
1438                                        "returned %d\n", status->ls_mdt_device,
1439                                        status->ls_registration, info->recno,
1440                                        rc);
1441                 }
1442
1443                 if (!rc && !dryrun) {
1444                         status->ls_last_recno = info->recno;
1445                         lr_write_log();
1446                 }
1447         }
1448
1449         return rc;
1450 }
1451
1452 /* Locate a usable version of rsync. At this point we'll use any
1453    version. */
1454 int lr_locate_rsync()
1455 {
1456         FILE *fp;
1457         int len;
1458
1459         /* Locate rsync */
1460         snprintf(rsync, sizeof(rsync), "%s -p %s", TYPE, RSYNC);
1461         fp = popen(rsync, "r");
1462         if (fp == NULL)
1463                 return -1;
1464
1465         if (fgets(rsync, sizeof(rsync), fp) == NULL) {
1466                 fclose(fp);
1467                 return -1;
1468         }
1469
1470         len = strlen(rsync);
1471         if (len > 0 && rsync[len - 1] == '\n')
1472                 rsync[len - 1] = '\0';
1473         fclose(fp);
1474
1475         /* Determine the version of rsync */
1476         snprintf(rsync_ver, sizeof(rsync_ver), "%s --version", rsync);
1477         fp = popen(rsync_ver, "r");
1478         if (fp == NULL)
1479                 return -1;
1480
1481         if (fgets(rsync_ver, sizeof(rsync_ver), fp) == NULL) {
1482                 fclose(fp);
1483                 return -1;
1484         }
1485         len = strlen(rsync_ver);
1486         if (len > 0 && rsync_ver[len - 1] == '\n')
1487                 rsync_ver[len - 1] = '\0';
1488         fclose(fp);
1489
1490         return 0;
1491
1492 }
1493
1494 /* Print the replication parameters */
1495 void lr_print_status(struct lr_info *info)
1496 {
1497         int i;
1498
1499         if (!verbose)
1500                 return;
1501
1502         printf("Lustre filesystem: %s\n", status->ls_source_fs);
1503         printf("MDT device: %s\n", status->ls_mdt_device);
1504         printf("Source: %s\n", status->ls_source);
1505         for (i = 0; i < status->ls_num_targets; i++)
1506                 printf("Target: %s\n", status->ls_targets[i]);
1507         if (statuslog != NULL)
1508                 printf("Statuslog: %s\n", statuslog);
1509         printf("Changelog registration: %s\n", status->ls_registration);
1510         printf("Starting changelog record: %jd\n",
1511                (uintmax_t)status->ls_last_recno);
1512         if (noxattr)
1513                 printf("Replicate xattrs: no\n");
1514         if (noclear)
1515                 printf("Clear changelog after use: no\n");
1516         if (use_rsync)
1517                 printf("Using rsync: %s (%s)\n", rsync, rsync_ver);
1518 }
1519
1520 void lr_print_failure(struct lr_info *info, int rc)
1521 {
1522         fprintf(stderr, "Replication of operation failed(%d):"
1523                 " %lld %s (%d) %s %s %s\n", rc, info->recno,
1524                 changelog_type2str(info->type), info->type, info->tfid,
1525                 info->pfid, info->name);
1526 }
1527
1528 /* Replicate filesystem operations from src_path to target_path */
1529 int lr_replicate()
1530 {
1531         void *changelog_priv;
1532         struct lr_info *info;
1533         struct lr_info *ext = NULL;
1534         time_t start;
1535         int xattr_not_supp;
1536         int i;
1537         int rc;
1538
1539         start = time(NULL);
1540
1541         info = calloc(1, sizeof(struct lr_info));
1542         if (info == NULL)
1543                 return -ENOMEM;
1544
1545         rc = llapi_search_fsname(status->ls_source, status->ls_source_fs);
1546         if (rc) {
1547                 fprintf(stderr, "Source path is not a valid Lustre client "
1548                         "mountpoint.\n");
1549                 goto out;
1550         }
1551
1552         if (status->ls_mdt_device[0] == '\0') {
1553                 int len;
1554
1555                 len = snprintf(status->ls_mdt_device,
1556                                sizeof(status->ls_mdt_device), "%s%s",
1557                                status->ls_source_fs, DEFAULT_MDT);
1558                 if (len >= sizeof(status->ls_mdt_device)) {
1559                         rc = -E2BIG;
1560                         goto out;
1561                 }
1562         }
1563
1564         ext = calloc(1, sizeof(struct lr_info));
1565         if (ext == NULL) {
1566                 rc = -ENOMEM;
1567                 goto out;
1568         }
1569
1570         for (i = 0, xattr_not_supp = 0; i < status->ls_num_targets; i++) {
1571                 snprintf(info->dest, sizeof(info->dest), "%s/%s",
1572                          status->ls_targets[i], SPECIAL_DIR);
1573                 rc = mkdir(info->dest, 0777);
1574                 if (rc == -1 && errno != EEXIST) {
1575                         fprintf(stderr, "Error writing to target path %s.\n",
1576                                 status->ls_targets[i]);
1577                         rc = -errno;
1578                         goto out;
1579                 }
1580                 rc = llistxattr(info->src, info->xlist, info->xsize);
1581                 if (rc == -1 && errno == ENOTSUP) {
1582                         fprintf(stderr, "xattrs not supported on %s\n",
1583                                 status->ls_targets[i]);
1584                         xattr_not_supp++;
1585                 }
1586         }
1587         if (xattr_not_supp == status->ls_num_targets)
1588                 /* None of the targets support xattrs. */
1589                 noxattr = 1;
1590
1591         lr_print_status(info);
1592
1593         /* Open changelogs for consumption*/
1594         rc = llapi_changelog_start(&changelog_priv,
1595                                 CHANGELOG_FLAG_BLOCK |
1596                                 CHANGELOG_FLAG_JOBID |
1597                                 CHANGELOG_FLAG_EXTRA_FLAGS,
1598                                 status->ls_mdt_device, status->ls_last_recno);
1599         if (rc < 0) {
1600                 fprintf(stderr, "Error opening changelog file for fs %s.\n",
1601                         status->ls_source_fs);
1602                 goto out;
1603         }
1604
1605         rc = llapi_changelog_set_xflags(changelog_priv,
1606                                         CHANGELOG_EXTRA_FLAG_UIDGID |
1607                                         CHANGELOG_EXTRA_FLAG_NID |
1608                                         CHANGELOG_EXTRA_FLAG_OMODE |
1609                                         CHANGELOG_EXTRA_FLAG_XATTR);
1610         if (rc < 0) {
1611                 fprintf(stderr, "Error setting xflag in changelog for fs %s.\n",
1612                         status->ls_source_fs);
1613                 goto out;
1614         }
1615
1616         while (!quit && lr_parse_line(changelog_priv, info) == 0) {
1617                 rc = 0;
1618                 if (info->type == CL_RENAME && !info->is_extended) {
1619                         /* Newer rename operations extends changelog to store
1620                          * source file information, but old changelog has
1621                          * another record.
1622                          */
1623                         if (lr_parse_line(changelog_priv, ext) != 0)
1624                                 break;
1625                         memcpy(info->sfid, info->tfid, sizeof(info->sfid));
1626                         memcpy(info->spfid, info->pfid, sizeof(info->spfid));
1627                         memcpy(info->tfid, ext->tfid, sizeof(info->tfid));
1628                         memcpy(info->pfid, ext->pfid, sizeof(info->pfid));
1629                         snprintf(info->sname, sizeof(info->sname), "%s",
1630                                  info->name);
1631                         snprintf(info->name, sizeof(info->name), "%s",
1632                                  ext->name);
1633                         info->is_extended = 1;
1634                         info->recno = ext->recno; /* For lr_clear_cl(). */
1635                 }
1636
1637                 if (dryrun)
1638                         continue;
1639
1640                 lr_debug(DTRACE, "***** Start %lld %s (%d) %s %s %s *****\n",
1641                          info->recno, changelog_type2str(info->type),
1642                          info->type, info->tfid, info->pfid, info->name);
1643
1644                 switch(info->type) {
1645                 case CL_CREATE:
1646                 case CL_MKDIR:
1647                 case CL_MKNOD:
1648                 case CL_SOFTLINK:
1649                         rc = lr_create(info);
1650                         break;
1651                 case CL_RMDIR:
1652                 case CL_UNLINK:
1653                         rc = lr_remove(info);
1654                         break;
1655                 case CL_RENAME:
1656                         rc = lr_move(info);
1657                         break;
1658                 case CL_HARDLINK:
1659                         rc = lr_link(info);
1660                         break;
1661                 case CL_TRUNC:
1662                 case CL_SETATTR:
1663                         rc = lr_setattr(info);
1664                         break;
1665                 case CL_SETXATTR:
1666                         rc = lr_setxattr(info);
1667                         break;
1668                 case CL_CLOSE:
1669                 case CL_EXT:
1670                 case CL_OPEN:
1671                 case CL_GETXATTR:
1672                 case CL_DN_OPEN:
1673                 case CL_LAYOUT:
1674                 case CL_MARK:
1675                         /* Nothing needs to be done for these entries */
1676                         /* fallthrough */
1677                 default:
1678                         break;
1679                 }
1680
1681                 lr_debug(DTRACE, "##### End %lld %s (%d) %s %s %s rc=%d #####\n",
1682                          info->recno, changelog_type2str(info->type),
1683                          info->type, info->tfid, info->pfid, info->name, rc);
1684
1685                 if (rc && rc != -ENOENT) {
1686                         lr_print_failure(info, rc);
1687                         errors++;
1688                         if (abort_on_err)
1689                                 break;
1690                 }
1691                 lr_clear_cl(info, 0);
1692         }
1693
1694         llapi_changelog_fini(&changelog_priv);
1695
1696         if (errors || verbose)
1697                 printf("Errors: %d\n", errors);
1698
1699         /* Clear changelog records used so far */
1700         lr_clear_cl(info, 1);
1701
1702         if (verbose) {
1703                 printf("lustre_rsync took %ld seconds\n", time(NULL) - start);
1704                 printf("Changelog records consumed: %lld\n", rec_count);
1705         }
1706
1707         rc = 0;
1708
1709 out:
1710         if (info != NULL)
1711                 free(info);
1712         if (ext != NULL)
1713                 free(ext);
1714
1715         return rc;
1716 }
1717
1718 void
1719 termination_handler (int signum)
1720 {
1721         /* Set a flag for the replicator to gracefully shutdown */
1722         quit = 1;
1723         printf("lustre_rsync halting.\n");
1724 }
1725
1726 int main(int argc, char *argv[])
1727 {
1728         int newsize;
1729         int numtargets = 0;
1730         int rc = 0;
1731
1732         if ((rc = lr_init_status()) != 0)
1733                 return rc;
1734
1735         while ((rc = getopt_long(argc, argv, "as:t:m:u:l:vx:zc:ry:n:d:D:",
1736                                  long_opts, NULL)) >= 0) {
1737                 switch (rc) {
1738                 case 'a':
1739                         /* Assume absolute paths */
1740                         abort_on_err++;
1741                         break;
1742                 case 's':
1743                         /* Assume absolute paths */
1744                         snprintf(status->ls_source, sizeof(status->ls_source),
1745                                  "%s", optarg);
1746                         break;
1747                 case 't':
1748                         status->ls_num_targets++;
1749                         numtargets++;
1750                         if (numtargets != status->ls_num_targets) {
1751                                 /* Targets were read from a log
1752                                    file. The ones specified on the
1753                                    command line take precedence. The
1754                                    ones from the log file will be
1755                                    ignored. */
1756                                 status->ls_num_targets = numtargets;
1757                         }
1758                         newsize = sizeof (struct lustre_rsync_status) +
1759                                 (status->ls_num_targets * (PATH_MAX + 1));
1760                         if (status->ls_size != newsize) {
1761                                 status->ls_size = newsize;
1762                                 status = lr_grow_buf(status, newsize);
1763                                 if (status == NULL)
1764                                         return -ENOMEM;
1765                         }
1766                         snprintf(status->ls_targets[status->ls_num_targets - 1],
1767                                  sizeof(status->ls_targets[0]), "%s", optarg);
1768                         break;
1769                 case 'm':
1770                         snprintf(status->ls_mdt_device,
1771                                  sizeof(status->ls_mdt_device),
1772                                  "%s", optarg);
1773                         break;
1774                 case 'u':
1775                         snprintf(status->ls_registration,
1776                                  sizeof(status->ls_registration),
1777                                  "%s", optarg);
1778                         break;
1779                 case 'l':
1780                         statuslog = optarg;
1781                         (void) lr_read_log();
1782                         break;
1783                 case 'v':
1784                         verbose++;
1785                         break;
1786                 case 'x':
1787                         if (strcmp("no", optarg) == 0) {
1788                                 noxattr = 1;
1789                         } else if (strcmp("yes", optarg) != 0) {
1790                                 printf("Invalid parameter %s. "
1791                                        "Specify --xattr=no or --xattr=yes\n",
1792                                        optarg);
1793                                 return -1;
1794                         }
1795                         break;
1796                 case 'z':
1797                         dryrun = 1;
1798                         break;
1799                 case 'c':
1800                         /* Undocumented option cl-clear */
1801                         if (strcmp("no", optarg) == 0) {
1802                                 noclear = 1;
1803                         } else if (strcmp("yes", optarg) != 0) {
1804                                 printf("Invalid parameter %s. "
1805                                        "Specify --cl-clear=no "
1806                                        "or --cl-clear=yes\n",
1807                                        optarg);
1808                                 return -1;
1809                         }
1810                         break;
1811                 case 'r':
1812                         /* Undocumented option use-rsync */
1813                         use_rsync = 1;
1814                         break;
1815                 case 'y':
1816                         /* Undocumented option rsync-threshold */
1817                         rsync_threshold = atol(optarg);
1818                         break;
1819                 case 'n':
1820                         /* Undocumented option start-recno */
1821                         status->ls_last_recno = atol(optarg);
1822                         break;
1823                 case 'd':
1824                         /* Undocumented option debug */
1825                         debug = atoi(optarg);
1826                         if (debug < 0 || debug > 2)
1827                                 debug = 0;
1828                         break;
1829                 case 'D':
1830                         /* Undocumented option debug log file */
1831                         if (debug_log != NULL)
1832                                 fclose(debug_log);
1833                         debug_log = fopen(optarg, "a");
1834                         if (debug_log == NULL) {
1835                                 printf("Cannot open %s for debug log\n",
1836                                        optarg);
1837                                 return -1;
1838                         }
1839                         break;
1840                 default:
1841                         fprintf(stderr, "error: %s: option '%s' "
1842                                 "unrecognized.\n", argv[0], argv[optind - 1]);
1843                         lr_usage();
1844                         return -1;
1845                 }
1846         }
1847
1848         if (status->ls_last_recno == -1)
1849                 status->ls_last_recno = 0;
1850         if (strnlen(status->ls_registration, LR_NAME_MAXLEN) == 0) {
1851                 /* No registration ID was passed in. */
1852                 printf("Please specify changelog consumer registration id.\n");
1853                 lr_usage();
1854                 return -1;
1855         }
1856         if (strnlen(status->ls_source, PATH_MAX) == 0) {
1857                 fprintf(stderr, "Please specify the source path.\n");
1858                 lr_usage();
1859                 return -1;
1860         }
1861         if (strnlen(status->ls_targets[0], PATH_MAX) == 0) {
1862                 fprintf(stderr, "Please specify the target path.\n");
1863                 lr_usage();
1864                 return -1;
1865         }
1866
1867         rc = lr_locate_rsync();
1868         if (use_rsync && rc != 0) {
1869                 fprintf(stderr, "Error: unable to locate %s.\n", RSYNC);
1870                 exit(-1);
1871         }
1872
1873         signal(SIGINT, termination_handler);
1874         signal(SIGHUP, termination_handler);
1875         signal(SIGTERM, termination_handler);
1876
1877         rc = lr_replicate();
1878
1879         if (debug_log != NULL)
1880                 fclose(debug_log);
1881         return rc;
1882 }