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, 2016, 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 #include <linux/lustre/lustre_ioctl.h>
 124
 125 #include <libcfs/util/ioctl.h>
 126 #include <libcfs/util/string.h>
 127 #include <libcfs/util/parser.h>
 128 #include <linux/lnet/libcfs_debug.h>
 129 #include <lustre/lustreapi.h>
 130 #include "lustre_rsync.h"
 131
 132 #define REPLICATE_STATUS_VER 1
 133 #define CLEAR_INTERVAL 100
 134 #define DEFAULT_RSYNC_THRESHOLD 0xA00000 /* 10 MB */
 135
 136 #define TYPE_STR_LEN 16
 137
 138 #define DEFAULT_MDT "-MDT0000"
 139 #define SPECIAL_DIR ".lustrerepl"
 140 #define RSYNC "rsync"
 141 #define TYPE "type"
 142
 143 /* Debug flags */
 144 #define DINFO 1
 145 #define DTRACE 2
 146
 147 /* Not used; declared for fulfilling obd.c's dependency. */
 148 command_t cmdlist[0];
 149
 150 /* Information for processing a changelog record. This structure is
 151    allocated on the heap instead of allocating large variables on the
 152    stack. */
 153 struct lr_info {
 154         long long recno;
 155         int target_no;
 156         unsigned int is_extended:1;
 157         enum changelog_rec_type type;
 158         char tfid[LR_FID_STR_LEN];
 159         char pfid[LR_FID_STR_LEN];
 160         char sfid[LR_FID_STR_LEN];
 161         char spfid[LR_FID_STR_LEN];
 162         char sname[NAME_MAX + 1];
 163         char name[NAME_MAX + 1];
 164         char src[PATH_MAX + 1];
 165         char dest[PATH_MAX + 1];
 166         char path[PATH_MAX + 1];
 167         char savedpath[PATH_MAX + 1];
 168         char link[PATH_MAX + 1];
 169         char linktmp[PATH_MAX + 1];
 170         char cmd[PATH_MAX];
 171         int bufsize;
 172         char *buf;
 173
 174         /* Variables for querying the xattributes */
 175         char *xlist;
 176         size_t xsize;
 177         char *xvalue;
 178         size_t xvsize;
 179 };
 180
 181 struct lr_parent_child_list {
 182         struct lr_parent_child_log pc_log;
 183         struct lr_parent_child_list *pc_next;
 184 };
 185
 186 struct lustre_rsync_status *status;
 187 char *statuslog;  /* Name of the status log file */
 188 int logbackedup;
 189 int noxattr;    /* Flag to turn off replicating xattrs */
 190 int noclear;    /* Flag to turn off clearing changelogs */
 191 int debug;      /* Flag to turn debugging information on and off */
 192 int verbose;    /* Verbose output */
 193 long long rec_count; /* No of changelog records that were processed */
 194 int errors;
 195 int dryrun;
 196 int use_rsync;  /* Flag to turn on use of rsync to copy data */
 197 long long rsync_threshold = DEFAULT_RSYNC_THRESHOLD;
 198 int quit;       /* Flag to stop processing the changelog; set on the
 199                    receipt of a signal */
 200 int abort_on_err = 0;
 201
 202 char rsync[PATH_MAX];
 203 char rsync_ver[PATH_MAX];
 204 struct lr_parent_child_list *parents;
 205
 206 FILE *debug_log;
 207
 208 /* Command line options */
 209 struct option long_opts[] = {
 210         { .val = 'l',   .name = "statuslog",    .has_arg = required_argument },
 211         { .val = 'm',   .name = "mdt",          .has_arg = required_argument },
 212         { .val = 's',   .name = "source",       .has_arg = required_argument },
 213         { .val = 't',   .name = "target",       .has_arg = required_argument },
 214         { .val = 'u',   .name = "user",         .has_arg = required_argument },
 215         { .val = 'v',   .name = "verbose",      .has_arg = no_argument },
 216         { .val = 'x',   .name = "xattr",        .has_arg = required_argument },
 217         { .val = 'z',   .name = "dry-run",      .has_arg = no_argument },
 218         /* Undocumented options follow */
 219         { .val = 'a',   .name = "abort-on-err", .has_arg = no_argument },
 220         { .val = 'c',   .name = "cl-clear",     .has_arg = required_argument },
 221         { .val = 'd',   .name = "debug",        .has_arg = required_argument },
 222         { .val = 'D',   .name = "debuglog",     .has_arg = required_argument },
 223         { .val = 'n',   .name = "start-recno",  .has_arg = required_argument },
 224         { .val = 'r',   .name = "use-rsync",    .has_arg = no_argument },
 225         { .val = 'y',   .name = "rsync-threshold",
 226                                                 .has_arg = required_argument },
 227         { .name = NULL } };
 228
 229 /* Command line usage */
 230 void lr_usage()
 231 {
 232         fprintf(stderr, "\tlustre_rsync -s <lustre_root_path> -t <target_path> "
 233                 "-m <mdt> -r <user id> -l <status log>\n"
 234                 "lustre_rsync can also pick up parameters from a "
 235                 "status log created earlier.\n"
 236                 "\tlustre_rsync -l <log_file>\n"
 237                 "options:\n"
 238                 "\t--xattr <yes|no> replicate EAs\n"
 239                 "\t--abort-on-err   abort at first err\n"
 240                 "\t--verbose\n"
 241                 "\t--dry-run        don't write anything\n");
 242 }
 243
 244 #define DEBUG_ENTRY(info)                                                      \
 245         lr_debug(D_TRACE, "***** Start %lld %s (%d) %s %s %s *****\n",         \
 246                  (info)->recno, changelog_type2str((info)->type),              \
 247                  (info)->type, (info)->tfid, (info)->pfid, (info)->name);
 248
 249 #define DEBUG_EXIT(info, rc)                                                   \
 250         lr_debug(D_TRACE, "##### End %lld %s (%d) %s %s %s rc=%d #####\n",     \
 251                  (info)->recno, changelog_type2str((info)->type),              \
 252                  (info)->type, (info)->tfid, (info)->pfid, (info)->name, rc);
 253
 254 /* Print debug information. This is controlled by the value of the
 255    global variable 'debug' */
 256 void lr_debug(int level, const char *fmt, ...)
 257 {
 258         va_list ap;
 259
 260         if (level > debug)
 261                 return;
 262
 263         va_start(ap, fmt);
 264         if (debug_log != NULL)
 265                 vfprintf(debug_log, fmt, ap);
 266         else
 267                 vfprintf(stdout, fmt, ap);
 268         va_end(ap);
 269 }
 270
 271
 272 void * lr_grow_buf(void *buf, int size)
 273 {
 274         void *ptr;
 275
 276         ptr = realloc(buf, size);
 277         if (ptr == NULL)
 278                 free(buf);
 279         return ptr;
 280 }
 281
 282
 283 /* Use rsync to replicate file data */
 284 int lr_rsync_data(struct lr_info *info)
 285 {
 286         int rc;
 287         struct stat st_src, st_dest;
 288         char cmd[PATH_MAX];
 289
 290         lr_debug(DTRACE, "Syncing data%s\n", info->tfid);
 291
 292         rc = stat(info->src, &st_src);
 293         if (rc == -1) {
 294                 fprintf(stderr, "Error: Unable to stat src=%s %s\n",
 295                         info->src, info->name);
 296                 if (errno == ENOENT)
 297                         return 0;
 298                 else
 299                         return -errno;
 300         }
 301         rc = stat(info->dest, &st_dest);
 302         if (rc == -1) {
 303                 fprintf(stderr, "Error: Unable to stat dest=%s\n",
 304                         info->dest);
 305                 return -errno;
 306         }
 307
 308         if (st_src.st_mtime != st_dest.st_mtime ||
 309             st_src.st_size != st_dest.st_size) {
 310                 /* XXX spawning off an rsync for every data sync and
 311                  * waiting synchronously is bad for performance.
 312                  * librsync could possibly used here. But it does not
 313                  * seem to be of production grade. Multi-threaded
 314                  * replication is also to be considered.
 315                  */
 316                 int status;
 317                 snprintf(cmd, PATH_MAX, "%s --inplace %s %s", rsync, info->src,
 318                         info->dest);
 319                 lr_debug(DTRACE, "\t%s %s\n", cmd, info->tfid);
 320                 status = system(cmd);
 321                 if (status == -1) {
 322                         rc = -errno;
 323                 } else if (WIFEXITED(status)) {
 324                         status = WEXITSTATUS(status);
 325                         if (!status)
 326                                 rc = 0;
 327                         else if (status == 23 || status == 24)
 328                                 /* Error due to vanished source files;
 329                                    Ignore this error*/
 330                                 rc = 0;
 331                         else
 332                                 rc = -EINVAL;
 333                         if (status)
 334                                 lr_debug(DINFO, "rsync %s exited with %d %d\n",
 335                                          info->src, status, rc);
 336                 } else {
 337                         rc = -EINTR;
 338                 }
 339         } else {
 340                 lr_debug(DTRACE, "Not syncing %s and %s %s\n", info->src,
 341                          info->dest, info->tfid);
 342         }
 343
 344         return rc;
 345 }
 346
 347 int lr_copy_data(struct lr_info *info)
 348 {
 349         int fd_src = -1;
 350         int fd_dest = -1;
 351         int bufsize;
 352         int rsize;
 353         int rc = 0;
 354         struct stat st_src;
 355         struct stat st_dest;
 356
 357         fd_src = open(info->src, O_RDONLY);
 358         if (fd_src == -1)
 359                 return -errno;
 360         if (fstat(fd_src, &st_src) == -1 ||
 361             stat(info->dest, &st_dest) == -1)
 362                 goto out;
 363
 364         if (st_src.st_mtime == st_dest.st_mtime &&
 365             st_src.st_size == st_dest.st_size)
 366                 goto out;
 367
 368         if (st_src.st_size > rsync_threshold && rsync[0] != '\0') {
 369                 /* It is more efficient to use rsync to replicate
 370                    large files. Any file larger than rsync_threshold
 371                    is handed off to rsync. */
 372                 lr_debug(DTRACE, "Using rsync to replicate %s\n", info->tfid);
 373                 rc = lr_rsync_data(info);
 374                 goto out;
 375         }
 376
 377         fd_dest = open(info->dest, O_WRONLY | O_TRUNC, st_src.st_mode);
 378         if (fd_dest == -1) {
 379                 rc = -errno;
 380                 goto out;
 381         }
 382         bufsize = st_dest.st_blksize;
 383
 384         if (info->bufsize < bufsize) {
 385                 /* Grow buffer */
 386                 info->buf = lr_grow_buf(info->buf, bufsize);
 387                 if (info->buf == NULL) {
 388                         rc = -ENOMEM;
 389                         goto out;
 390                 }
 391                 info->bufsize = bufsize;
 392         }
 393
 394         while (1) {
 395                 char *buf;
 396                 int wsize;
 397
 398                 buf = info->buf;
 399                 rsize = read(fd_src, buf, bufsize);
 400                 if (rsize == 0) {
 401                         rc = 0;
 402                         break;
 403                 }
 404                 if (rsize < 0) {
 405                         rc = -errno;
 406                         break;
 407                 }
 408                 do {
 409                         wsize = write(fd_dest, buf, rsize);
 410                         if (wsize <= 0) {
 411                                 rc = -errno;
 412                                 break;
 413                         }
 414                         rsize -= wsize;
 415                         buf += wsize;
 416                 } while (rsize > 0);
 417         }
 418         fsync(fd_dest);
 419
 420 out:
 421         if (fd_src != -1)
 422                 close(fd_src);
 423         if (fd_dest != -1)
 424                 close(fd_dest);
 425
 426         return rc;
 427 }
 428
 429 /* Copy data from source to destination */
 430 int lr_sync_data(struct lr_info *info)
 431 {
 432         if (use_rsync)
 433                 return lr_rsync_data(info);
 434         else
 435                 return lr_copy_data(info);
 436 }
 437
 438 /* Copy all attributes from file src to file dest */
 439 int lr_copy_attr(char *src, char *dest)
 440 {
 441         struct stat st;
 442         struct utimbuf time;
 443
 444         if (stat(src, &st) == -1 ||
 445             chmod(dest, st.st_mode) == -1 ||
 446             chown(dest, st.st_uid, st.st_gid) == -1)
 447                 return -errno;
 448
 449         time.actime = st.st_atime;
 450         time.modtime = st.st_mtime;
 451         if (utime(dest, &time) == -1)
 452                 return -errno;
 453         return 0;
 454 }
 455
 456 /* Copy all xattrs from file info->src to info->dest */
 457 int lr_copy_xattr(struct lr_info *info)
 458 {
 459         size_t size = info->xsize;
 460         int start;
 461         int len;
 462         int rc;
 463
 464         if (noxattr)
 465                 return 0;
 466
 467         errno = 0;
 468         rc = llistxattr(info->src, info->xlist, size);
 469         lr_debug(DTRACE, "llistxattr(%s,%p) returned %d, errno=%d\n",
 470                  info->src, info->xlist, rc, errno);
 471         if ((rc > 0 && info->xlist == NULL) || errno == ERANGE) {
 472                 size = rc > PATH_MAX ? rc : PATH_MAX;
 473                 info->xlist = lr_grow_buf(info->xlist, size);
 474                 if (info->xlist == NULL)
 475                         return -ENOMEM;
 476                 info->xsize = size;
 477                 rc = llistxattr(info->src, info->xlist, size);
 478                 lr_debug(DTRACE, "llistxattr %s returned %d, errno=%d\n",
 479                          info->src, rc, errno);
 480         }
 481         if (rc < 0)
 482                 return rc;
 483
 484         len = rc;
 485         start = 0;
 486         while (start < len) {
 487                 size = info->xvsize;
 488                 rc = lgetxattr(info->src, info->xlist + start,
 489                                info->xvalue, size);
 490                 if (info->xvalue == NULL || errno == ERANGE) {
 491                         size = rc > PATH_MAX ? rc : PATH_MAX;
 492                         info->xvalue = lr_grow_buf(info->xvalue, size);
 493                         if (info->xvalue == NULL)
 494                                 return -ENOMEM;
 495                         info->xvsize = size;
 496                         rc = lgetxattr(info->src, info->xlist + start,
 497                                        info->xvalue, size);
 498                 }
 499                 lr_debug(DTRACE, "\t(%s,%d) rc=%p\n", info->xlist + start,
 500                          info->xvalue, rc);
 501                 if (rc > 0) {
 502                         size = rc;
 503                         rc = lsetxattr(info->dest, info->xlist + start,
 504                                        info->xvalue, size, 0);
 505                         lr_debug(DTRACE, "\tlsetxattr(), rc=%d, errno=%d\n",
 506                                  rc, errno);
 507                         if (rc == -1) {
 508                                 if (errno != ENOTSUP) {
 509                                         fprintf(stderr, "Error replicating "
 510                                                 " xattr for %s: %d\n",
 511                                                 info->dest, errno);
 512                                         errors++;
 513                                 }
 514                                 rc = 0;
 515                         }
 516                 }
 517                 start += strlen(info->xlist + start) + 1;
 518         }
 519
 520         lr_debug(DINFO, "setxattr: %s %s\n", info->src, info->dest);
 521
 522         return rc;
 523 }
 524
 525 /* Retrieve the filesystem path for a given FID and a given
 526    linkno. The path is returned in info->path */
 527 int lr_get_path_ln(struct lr_info *info, char *fidstr, int linkno)
 528 {
 529         long long recno = -1;
 530         int rc;
 531
 532         rc = llapi_fid2path(status->ls_source, fidstr, info->path,
 533                             PATH_MAX, &recno, &linkno);
 534         if (rc < 0 && rc != -ENOENT) {
 535                 fprintf(stderr, "fid2path error: (%s, %s) %d %s\n",
 536                         status->ls_source, fidstr, -rc, strerror(errno = -rc));
 537         }
 538
 539         return rc;
 540 }
 541
 542 /* Retrieve the filesystem path for a given FID. The path is returned
 543    in info->path */
 544 int lr_get_path(struct lr_info *info, char *fidstr)
 545 {
 546         return lr_get_path_ln(info, fidstr, 0);
 547 }
 548
 549 /* Generate the path for opening by FID */
 550 void lr_get_FID_PATH(char *mntpt, char *fidstr, char *buf, int bufsize)
 551 {
 552         /* Open-by-FID path is <mntpt>/.lustre/fid/[SEQ:OID:VER] */
 553         snprintf(buf, bufsize, "%s/%s/fid/%s", mntpt, dot_lustre_name,
 554                  fidstr);
 555         return;
 556 }
 557
 558 /* Read the symlink information into 'info->link' */
 559 int lr_get_symlink(struct lr_info *info)
 560 {
 561         int rc;
 562         char *link;
 563
 564         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
 565         rc = readlink(info->src, info->linktmp, PATH_MAX);
 566         if (rc > 0)
 567                 info->linktmp[rc] = '\0';
 568         else
 569                 return rc;
 570         lr_debug(DTRACE, "symlink: readlink returned %s\n", info->linktmp);
 571
 572         if (strncmp(info->linktmp, status->ls_source,
 573                     strlen(status->ls_source)) == 0) {
 574                 /* Strip source fs path and replace with target fs path. */
 575                 link = info->linktmp + strlen(status->ls_source);
 576                 snprintf(info->src, PATH_MAX, "%s%s",
 577                          status->ls_targets[info->target_no], link);
 578                 link = info->src;
 579         } else {
 580                 link = info->linktmp;
 581         }
 582         strlcpy(info->link, link, sizeof(info->link));
 583
 584         return rc;
 585 }
 586
 587 /* Create file/directory/device file/symlink. */
 588 int lr_mkfile(struct lr_info *info)
 589 {
 590         struct stat st;
 591         int rc = 0;
 592
 593         errno = 0;
 594         lr_debug(DINFO, "mkfile(%d) %s \n", info->type, info->dest);
 595         if (info->type == CL_MKDIR) {
 596                 rc = mkdir(info->dest, 0777);
 597         } else if (info->type == CL_SOFTLINK) {
 598                 lr_get_symlink(info);
 599                 rc = symlink(info->link, info->dest);
 600         } else if (info->type == CL_MKNOD) {
 601                 lr_get_FID_PATH(status->ls_source, info->tfid,
 602                                     info->src, PATH_MAX);
 603                 rc = stat(info->src, &st);
 604                 if (rc == -1) {
 605                         if (errno == ENOENT)
 606                                 return 0;
 607                         else
 608                                 return -errno;
 609                 }
 610                 rc = mknod(info->dest, st.st_mode, st.st_rdev);
 611         } else {
 612                 rc = mknod(info->dest, S_IFREG | 0777, 0);
 613         }
 614
 615         if (rc < 0) {
 616                 if (errno == EEXIST)
 617                         rc = 0;
 618                 else
 619                         return -errno;
 620         }
 621
 622         /* Sync data and attributes */
 623         if (info->type == CL_CREATE || info->type == CL_MKDIR) {
 624                 lr_debug(DTRACE, "Syncing data and attributes %s\n",
 625                          info->tfid);
 626                 (void) lr_copy_xattr(info);
 627                 if (info->type == CL_CREATE)
 628                         rc = lr_sync_data(info);
 629                 if (!rc)
 630                         rc = lr_copy_attr(info->src, info->dest);
 631
 632                 if (rc == -ENOENT)
 633                         /* Source file has disappeared. Not an error. */
 634                         rc = 0;
 635         } else {
 636                 lr_debug(DTRACE, "Not syncing data and attributes %s\n",
 637                          info->tfid);
 638         }
 639
 640         return rc;
 641 }
 642
 643 int lr_add_pc(const char *pfid, const char *tfid, const char *name)
 644 {
 645         struct lr_parent_child_list *p;
 646         size_t len;
 647
 648         p = calloc(1, sizeof(*p));
 649         if (p == NULL)
 650                 return -ENOMEM;
 651         len = strlcpy(p->pc_log.pcl_pfid, pfid, sizeof(p->pc_log.pcl_pfid));
 652         if (len >= sizeof(p->pc_log.pcl_pfid))
 653                 goto out_err;
 654         len = strlcpy(p->pc_log.pcl_tfid, tfid, sizeof(p->pc_log.pcl_tfid));
 655         if (len >= sizeof(p->pc_log.pcl_tfid))
 656                 goto out_err;
 657         len = strlcpy(p->pc_log.pcl_name, name, sizeof(p->pc_log.pcl_name));
 658         if (len >= sizeof(p->pc_log.pcl_name))
 659                 goto out_err;
 660
 661         p->pc_next = parents;
 662         parents = p;
 663         return 0;
 664
 665 out_err:
 666         free(p);
 667         return -E2BIG;
 668 }
 669
 670 void lr_cascade_move(const char *fid, const char *dest, struct lr_info *info)
 671 {
 672         struct lr_parent_child_list *curr, *prev;
 673         char *d;
 674         int rc;
 675
 676         d = calloc(1, PATH_MAX + 1);
 677         prev = curr = parents;
 678         while (curr) {
 679                 if (strcmp(curr->pc_log.pcl_pfid, fid) == 0) {
 680                         snprintf(d, PATH_MAX, "%s/%s", dest,
 681                                  curr->pc_log.pcl_name);
 682                         snprintf(info->src, PATH_MAX, "%s/%s/%s",
 683                                 status->ls_targets[info->target_no],
 684                                 SPECIAL_DIR, curr->pc_log.pcl_tfid);
 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         free(d);
 707 }
 708
 709 /* remove [info->spfid, info->sfid] from parents */
 710 int lr_remove_pc(const char *pfid, const char *tfid)
 711 {
 712         struct lr_parent_child_list *curr, *prev;
 713
 714         for (prev = curr = parents; curr; prev = curr, curr = curr->pc_next) {
 715                 if (strcmp(curr->pc_log.pcl_pfid, pfid) == 0 &&
 716                     strcmp(curr->pc_log.pcl_tfid, tfid) == 0) {
 717                         if (curr == parents)
 718                                 parents = curr->pc_next;
 719                         else
 720                                 prev->pc_next = curr->pc_next;
 721                         free(curr);
 722                         break;
 723                 }
 724         }
 725         return 0;
 726 }
 727
 728 /* Create file under SPECIAL_DIR with its tfid as its name. */
 729 int lr_mk_special(struct lr_info *info)
 730 {
 731         int rc;
 732
 733         snprintf(info->dest, PATH_MAX, "%s/%s/%s",
 734                 status->ls_targets[info->target_no], SPECIAL_DIR,
 735                 info->tfid);
 736
 737         rc = lr_mkfile(info);
 738         if (rc)
 739                 return rc;
 740
 741         rc = lr_add_pc(info->pfid, info->tfid, info->name);
 742         return rc;
 743 }
 744
 745 /* Remove a file or directory */
 746 int lr_rmfile(struct lr_info *info)
 747 {
 748         int rc;
 749
 750         if (info->type == CL_RMDIR)
 751                 rc = rmdir(info->dest);
 752         else
 753                 rc = unlink(info->dest);
 754         if (rc == -1)
 755                 rc = -errno;
 756         return rc;
 757 }
 758
 759 /* Recursively remove directory and its contents */
 760 int lr_rm_recursive(struct lr_info *info)
 761 {
 762         int rc;
 763
 764         snprintf(info->cmd, PATH_MAX, "rm -rf %s", info->dest);
 765         rc = system(info->cmd);
 766         if (rc == -1)
 767                 rc = -errno;
 768
 769         return rc;
 770 }
 771
 772 /* Remove a file under SPECIAL_DIR with its tfid as its name. */
 773 int lr_rm_special(struct lr_info *info)
 774 {
 775         int rc;
 776
 777         snprintf(info->dest, PATH_MAX, "%s/%s/%s",
 778                  status->ls_targets[info->target_no], SPECIAL_DIR,
 779                  info->tfid);
 780         rc = lr_rmfile(info);
 781
 782         if (rc)
 783                 lr_debug(DINFO, "remove: %s; rc=%d, errno=%d\n",
 784                          info->dest, rc, errno);
 785         return rc;
 786 }
 787
 788 /* Replicate file and directory create events */
 789 int lr_create(struct lr_info *info)
 790 {
 791         int len;
 792         int rc1 = 0;
 793         int rc;
 794         int mkspecial = 0;
 795
 796         /* Is target FID present on the source? */
 797         rc = lr_get_path(info, info->tfid);
 798         if (rc == -ENOENT) {
 799                 /* Source file has disappeared. Not an error. */
 800                 lr_debug(DINFO, "create: tfid %s not found on"
 801                          "source-fs\n", info->tfid);
 802                 return 0;
 803         } else if (rc) {
 804                 return rc;
 805         }
 806         strcpy(info->savedpath, info->path);
 807
 808         /* Is parent FID present on the source */
 809         rc = lr_get_path(info, info->pfid);
 810         if (rc == -ENOENT) {
 811                 lr_debug(DINFO, "create: pfid %s not found on source-fs\n",
 812                          info->tfid);
 813                 mkspecial = 1;
 814         } else if (rc < 0) {
 815                 return rc;
 816         }
 817
 818         /* Is f2p(pfid)+name != f2p(tfid)? If not the file has moved. */
 819         len = strlen(info->path);
 820         if (len == 1 && info->path[0] == '/')
 821                 snprintf(info->dest, PATH_MAX, "%s", info->name);
 822         else if (len - 1 > 0 && info->path[len - 1] == '/')
 823                 snprintf(info->dest, PATH_MAX, "%s%s", info->path, info->name);
 824         else
 825                 snprintf(info->dest, PATH_MAX, "%s/%s", info->path, info->name);
 826
 827         lr_debug(DTRACE, "dest = %s; savedpath = %s\n", info->dest,
 828                  info->savedpath);
 829         if (strncmp(info->dest, info->savedpath, PATH_MAX) != 0) {
 830                 lr_debug(DTRACE, "create: file moved (%s). %s != %s\n",
 831                          info->tfid, info->dest, info->savedpath);
 832                 mkspecial = 1;
 833         }
 834
 835         /* Is f2p(pfid) present on the target? If not, the parent has
 836            moved */
 837         if (!mkspecial) {
 838                 snprintf(info->dest, PATH_MAX, "%s/%s", status->ls_targets[0],
 839                         info->path);
 840                 if (access(info->dest, F_OK) != 0) {
 841                         lr_debug(DTRACE, "create: parent %s not found\n",
 842                                 info->dest);
 843                         mkspecial = 1;
 844                 }
 845         }
 846         for (info->target_no = 0; info->target_no < status->ls_num_targets;
 847              info->target_no++) {
 848                 snprintf(info->dest, PATH_MAX, "%s/%s",
 849                         status->ls_targets[info->target_no], info->savedpath);
 850                 lr_get_FID_PATH(status->ls_source, info->tfid, info->src,
 851                                     PATH_MAX);
 852
 853                 if (!mkspecial)
 854                         rc1 = lr_mkfile(info);
 855                 if (mkspecial || rc1 == -ENOENT) {
 856                         rc1 = lr_mk_special(info);
 857                 }
 858                 if (rc1)
 859                         rc = rc1;
 860         }
 861         return rc;
 862 }
 863
 864 /* Replicate a file remove (rmdir/unlink) operation */
 865 int lr_remove(struct lr_info *info)
 866 {
 867         int rc = 0;
 868         int rc1;
 869
 870         for (info->target_no = 0; info->target_no < status->ls_num_targets;
 871              info->target_no++) {
 872
 873                 rc1 = lr_rm_special(info);
 874                 if (!rc1)
 875                         continue;
 876
 877                 rc1 = lr_get_path(info, info->pfid);
 878                 if (rc1 == -ENOENT) {
 879                         lr_debug(DINFO, "remove: pfid %s not found\n",
 880                                  info->pfid);
 881                         continue;
 882                 }
 883                 if (rc1) {
 884                         rc = rc1;
 885                         continue;
 886                 }
 887                 snprintf(info->dest, PATH_MAX, "%s/%s/%s",
 888                         status->ls_targets[info->target_no], info->path,
 889                         info->name);
 890
 891                 rc1 = lr_rmfile(info);
 892                 lr_debug(DINFO, "remove: %s; rc1=%d, errno=%d\n",
 893                          info->dest, rc1, errno);
 894                 if (rc1 == -ENOTEMPTY)
 895                         rc1 = lr_rm_recursive(info);
 896
 897                 if (rc1) {
 898                         rc = rc1;
 899                         continue;
 900                 }
 901         }
 902         return rc;
 903 }
 904
 905 /* Replicate a rename/move operation. */
 906 int lr_move(struct lr_info *info)
 907 {
 908         int rc = 0;
 909         int rc1;
 910         int rc_dest, rc_src;
 911         int special_src = 0;
 912         int special_dest = 0;
 913         char srcpath[PATH_MAX + 1] = "";
 914
 915         assert(info->is_extended);
 916
 917         rc_src = lr_get_path(info, info->spfid);
 918         if (rc_src < 0 && rc_src != -ENOENT)
 919                 return rc_src;
 920         memcpy(srcpath, info->path, strlen(info->path));
 921
 922         rc_dest = lr_get_path(info, info->pfid);
 923         if (rc_dest < 0 && rc_dest != -ENOENT)
 924                 return rc_dest;
 925
 926         for (info->target_no = 0; info->target_no < status->ls_num_targets;
 927              info->target_no++) {
 928
 929                 if (!rc_dest) {
 930                         snprintf(info->dest, PATH_MAX, "%s/%s",
 931                                 status->ls_targets[info->target_no],
 932                                 info->path);
 933                         if (access(info->dest, F_OK) != 0) {
 934                                 rc_dest = -errno;
 935                         } else {
 936                                 snprintf(info->dest, PATH_MAX, "%s/%s/%s",
 937                                         status->ls_targets[info->target_no],
 938                                         info->path, info->name);
 939                         }
 940                         lr_debug(DINFO, "dest path %s rc_dest=%d\n", info->dest,
 941                                  rc_dest);
 942                 }
 943                 if (rc_dest == -ENOENT) {
 944                         snprintf(info->dest, PATH_MAX, "%s/%s/%s",
 945                                 status->ls_targets[info->target_no],
 946                                 SPECIAL_DIR, info->sfid);
 947                         special_dest = 1;
 948                         lr_debug(DINFO, "special dest %s\n", info->dest);
 949                 }
 950
 951                 if (!rc_src) {
 952                         snprintf(info->src, PATH_MAX, "%s/%s/%s",
 953                                 status->ls_targets[info->target_no],
 954                                 srcpath, info->sname);
 955                         lr_debug(DINFO, "src path %s rc_src=%d\n", info->src,
 956                                  rc_src);
 957                 }
 958                 if (rc_src == -ENOENT || (access(info->src, F_OK) != 0 &&
 959                                           errno == ENOENT)) {
 960                         snprintf(info->src, PATH_MAX, "%s/%s/%s",
 961                                 status->ls_targets[info->target_no],
 962                                 SPECIAL_DIR, info->sfid);
 963                         special_src = 1;
 964                         lr_debug(DINFO, "special src %s\n", info->src);
 965                 }
 966
 967                 rc1 = 0;
 968                 errno = 0;
 969                 if (strcmp(info->src, info->dest) != 0) {
 970                         rc1 = rename(info->src, info->dest);
 971                         if (rc1 == -1)
 972                                 rc1 = -errno;
 973                         lr_debug(DINFO, "rename returns %d\n", rc1);
 974                 }
 975
 976                 if (special_src)
 977                         rc1 = lr_remove_pc(info->spfid, info->sfid);
 978
 979                 if (!special_dest)
 980                         lr_cascade_move(info->sfid, info->dest, info);
 981                 else
 982                         rc1 = lr_add_pc(info->pfid, info->sfid, info->name);
 983
 984                 lr_debug(DINFO, "move: %s [to] %s rc1=%d, errno=%d\n",
 985                          info->src, info->dest, rc1, errno);
 986                 if (rc1)
 987                         rc = rc1;
 988         }
 989         return rc;
 990 }
 991
 992 /* Replicate a hard link */
 993 int lr_link(struct lr_info *info)
 994 {
 995         int i;
 996         int rc;
 997         int rc1;
 998         struct stat st;
 999
1000         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
1001         rc = stat(info->src, &st);
1002         if (rc == -1)
1003                 return -errno;
1004
1005         for (info->target_no = 0; info->target_no < status->ls_num_targets;
1006              info->target_no++) {
1007
1008                 info->src[0] = 0;
1009                 info->dest[0] = 0;
1010                 rc1 = 0;
1011
1012                 /*
1013                  * The changelog record has the new parent directory FID and
1014                  * name of the target file. So info->dest can be constructed
1015                  * by getting the path of the new parent directory and
1016                  * appending the target file name.
1017                  */
1018                 rc1 = lr_get_path(info, info->pfid);
1019                 lr_debug(rc1 ? 0 : DTRACE, "\tparent fid2path %s, %s, rc=%d\n",
1020                          info->path, info->name, rc1);
1021
1022                 if (rc1 == 0) {
1023                         snprintf(info->dest, sizeof(info->dest), "%s/%s/%s",
1024                                  status->ls_targets[info->target_no],
1025                                  info->path, info->name);
1026                         lr_debug(DINFO, "link destination is %s\n", info->dest);
1027                 }
1028
1029                 /* Search through the hardlinks to get the src */
1030                 for (i = 0; i < st.st_nlink && info->src[0] == 0; i++) {
1031                         rc1 = lr_get_path_ln(info, info->tfid, i);
1032                         lr_debug(rc1 ? 0:DTRACE, "\tfid2path %s, %s, %d rc=%d\n",
1033                                  info->path, info->name, i, rc1);
1034                         if (rc1)
1035                                 break;
1036
1037                         /*
1038                          * Compare the path of target FID with info->dest
1039                          * to find out info->src.
1040                          */
1041                         char srcpath[PATH_MAX];
1042
1043                         snprintf(srcpath, sizeof(srcpath), "%s/%s",
1044                                  status->ls_targets[info->target_no],
1045                                  info->path);
1046
1047                         if (strcmp(srcpath, info->dest) != 0) {
1048                                 strlcpy(info->src, srcpath, sizeof(info->src));
1049                                 lr_debug(DINFO, "link source is %s\n",
1050                                          info->src);
1051                         }
1052                 }
1053
1054                 if (rc1) {
1055                         rc = rc1;
1056                         continue;
1057                 }
1058
1059                 if (info->src[0] == 0)
1060                         snprintf(info->src, PATH_MAX, "%s/%s/%s",
1061                                 status->ls_targets[info->target_no],
1062                                 SPECIAL_DIR, info->tfid);
1063                 else if (info->dest[0] == 0)
1064                         snprintf(info->dest, PATH_MAX, "%s/%s/%s",
1065                                 status->ls_targets[info->target_no],
1066                                 SPECIAL_DIR, info->tfid);
1067
1068                 rc1 = link(info->src, info->dest);
1069                 lr_debug(DINFO, "link: %s [to] %s; rc1=%d %s\n",
1070                          info->src, info->dest, rc1,
1071                          strerror(rc1 ? errno : 0));
1072
1073                 if (rc1)
1074                         rc = rc1;
1075         }
1076         return rc;
1077 }
1078
1079 /* Replicate file attributes */
1080 int lr_setattr(struct lr_info *info)
1081 {
1082         int rc1;
1083         int rc;
1084
1085         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
1086
1087         rc = lr_get_path(info, info->tfid);
1088         if (rc == -ENOENT)
1089                 lr_debug(DINFO, "setattr: %s not present on source-fs\n",
1090                          info->src);
1091         if (rc)
1092                 return rc;
1093
1094         for (info->target_no = 0; info->target_no < status->ls_num_targets;
1095              info->target_no++) {
1096
1097                 snprintf(info->dest, PATH_MAX, "%s/%s",
1098                          status->ls_targets[info->target_no], info->path);
1099                 lr_debug(DINFO, "setattr: %s %s %s", info->src, info->dest,
1100                          info->tfid);
1101
1102                 rc1 = lr_sync_data(info);
1103                 if (!rc1)
1104                         rc1 = lr_copy_attr(info->src, info->dest);
1105                 if (rc1)
1106                         rc = rc1;
1107         }
1108         return rc;
1109 }
1110
1111 /* Replicate xattrs */
1112 int lr_setxattr(struct lr_info *info)
1113 {
1114         int rc, rc1;
1115
1116         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
1117
1118         rc = lr_get_path(info, info->tfid);
1119         if (rc == -ENOENT)
1120                 lr_debug(DINFO, "setxattr: %s not present on source-fs\n",
1121                          info->src);
1122         if (rc)
1123                 return rc;
1124
1125         for (info->target_no = 0; info->target_no < status->ls_num_targets;
1126              info->target_no++) {
1127
1128                 snprintf(info->dest, PATH_MAX, "%s/%s",
1129                         status->ls_targets[info->target_no], info->path);
1130                 lr_debug(DINFO, "setxattr: %s %s %s\n", info->src, info->dest,
1131                          info->tfid);
1132
1133                 rc1 = lr_copy_xattr(info);
1134                 if (rc1)
1135                         rc = rc1;
1136         }
1137
1138         return rc;
1139 }
1140
1141 /* Parse a line of changelog entry */
1142 int lr_parse_line(void *priv, struct lr_info *info)
1143 {
1144         struct changelog_rec            *rec;
1145         struct changelog_ext_rename     *rnm;
1146         size_t                           namelen;
1147         size_t                           copylen = sizeof(info->name);
1148
1149         if (llapi_changelog_recv(priv, &rec) != 0)
1150                 return -1;
1151
1152         info->is_extended = !!(rec->cr_flags & CLF_RENAME);
1153         info->recno = rec->cr_index;
1154         info->type = rec->cr_type;
1155         snprintf(info->tfid, sizeof(info->tfid), DFID, PFID(&rec->cr_tfid));
1156         snprintf(info->pfid, sizeof(info->pfid), DFID, PFID(&rec->cr_pfid));
1157
1158         namelen = strnlen(changelog_rec_name(rec), rec->cr_namelen);
1159         if (copylen > namelen + 1)
1160                 copylen = namelen + 1;
1161         strlcpy(info->name, changelog_rec_name(rec), copylen);
1162
1163         /* Don't use rnm if CLF_RENAME isn't set */
1164         rnm = changelog_rec_rename(rec);
1165         if (rec->cr_flags & CLF_RENAME && !fid_is_zero(&rnm->cr_sfid)) {
1166                 copylen = sizeof(info->sname);
1167
1168                 snprintf(info->sfid, sizeof(info->sfid), DFID,
1169                          PFID(&rnm->cr_sfid));
1170                 snprintf(info->spfid, sizeof(info->spfid), DFID,
1171                          PFID(&rnm->cr_spfid));
1172                 namelen = changelog_rec_snamelen(rec);
1173                 if (copylen > namelen + 1)
1174                         copylen = namelen + 1;
1175                 strlcpy(info->sname, changelog_rec_sname(rec), copylen);
1176
1177                 if (verbose > 1)
1178                         printf("Rec %lld: %d %s %s\n", info->recno, info->type,
1179                                 info->name, info->sname);
1180         } else {
1181                 if (verbose > 1)
1182                         printf("Rec %lld: %d %s\n", info->recno, info->type,
1183                                 info->name);
1184         }
1185
1186         llapi_changelog_free(&rec);
1187
1188         rec_count++;
1189         return 0;
1190 }
1191
1192 /* Initialize the replication parameters */
1193 int lr_init_status()
1194 {
1195         size_t size = sizeof(struct lustre_rsync_status) + PATH_MAX + 1;
1196
1197         if (status != NULL)
1198                 return 0;
1199         status = calloc(size, 1);
1200         if (status == NULL)
1201                 return -ENOMEM;
1202         status->ls_version = REPLICATE_STATUS_VER;
1203         status->ls_size = size;
1204         status->ls_last_recno = -1;
1205         return 0;
1206 }
1207
1208 /* Make a backup of the statuslog */
1209 void lr_backup_log()
1210 {
1211         char backupfile[PATH_MAX];
1212
1213         if (logbackedup)
1214                 return;
1215         snprintf(backupfile, PATH_MAX, "%s.old", statuslog);
1216         (void) rename(statuslog, backupfile);
1217         logbackedup = 1;
1218
1219         return;
1220 }
1221
1222 /* Save replication parameters to a statuslog. */
1223 int lr_write_log()
1224 {
1225         int fd;
1226         size_t size;
1227         size_t write_size = status->ls_size;
1228         struct lr_parent_child_list *curr;
1229         int rc = 0;
1230
1231         if (statuslog == NULL)
1232                 return 0;
1233
1234         lr_backup_log();
1235
1236         fd = open(statuslog, O_WRONLY | O_CREAT | O_SYNC,
1237                              S_IRUSR | S_IWUSR);
1238         if (fd == -1) {
1239                 fprintf(stderr, "Error opening log file for writing (%s)\n",
1240                         statuslog);
1241                 return -1;
1242         }
1243         errno = 0;
1244         size = write(fd, status, write_size);
1245         if (size != write_size) {
1246                 fprintf(stderr, "Error writing to log file (%s) %d\n",
1247                         statuslog, errno);
1248                 close(fd);
1249                 return -1;
1250         }
1251
1252         for (curr = parents; curr; curr = curr->pc_next) {
1253                 size = write(fd, &curr->pc_log, sizeof(curr->pc_log));
1254                 if (size != sizeof(curr->pc_log)) {
1255                         fprintf(stderr, "Error writing to log file (%s) %d\n",
1256                                 statuslog, errno);
1257                         rc = -1;
1258                         break;
1259                 }
1260         }
1261         close(fd);
1262         return rc;
1263 }
1264
1265 /* Read statuslog and populate the replication parameters.  Command
1266  * line parameters take precedence over parameters in the log file.*/
1267 int lr_read_log()
1268 {
1269         struct lr_parent_child_list *tmp;
1270         struct lr_parent_child_log rec;
1271         struct lustre_rsync_status *s;
1272         int fd = -1;
1273         size_t size;
1274         size_t read_size = sizeof(struct lustre_rsync_status) + PATH_MAX + 1;
1275         int rc = 0;
1276
1277         if (statuslog == NULL)
1278                 return 0;
1279
1280         s = calloc(1, read_size);
1281         if (s == NULL) {
1282                 rc = -ENOMEM;
1283                 goto out;
1284         }
1285
1286         fd = open(statuslog, O_RDONLY);
1287         if (fd == -1) {
1288                 rc = -errno;
1289                 goto out;
1290         }
1291
1292         size = read(fd, s, read_size);
1293         if (size != read_size) {
1294                 rc = -EINVAL;
1295                 goto out;
1296         }
1297
1298         if (read_size < s->ls_size) {
1299                 read_size = s->ls_size;
1300                 s = lr_grow_buf(s, read_size);
1301                 if (s == NULL) {
1302                         rc = -ENOMEM;
1303                         goto out;
1304                 }
1305
1306                 if (lseek(fd, 0, SEEK_SET) == -1) {
1307                         rc = -ENOMEM;
1308                         goto out;
1309                 }
1310
1311                 size = read(fd, s, read_size);
1312                 if (size != read_size) {
1313                         rc = -EINVAL;
1314                         goto out;
1315                 }
1316         }
1317
1318         while (read(fd, &rec, sizeof(rec)) != 0) {
1319                 tmp = calloc(1, sizeof(*tmp));
1320                 if (!tmp) {
1321                         rc = -ENOMEM;
1322                         goto out;
1323                 }
1324
1325                 tmp->pc_log = rec;
1326                 tmp->pc_next = parents;
1327                 parents = tmp;
1328         }
1329
1330         /* copy uninitialized fields to status */
1331         if (status->ls_num_targets == 0) {
1332                 if (status->ls_size != s->ls_size) {
1333                         status = lr_grow_buf(status, s->ls_size);
1334                         if (status == NULL) {
1335                                 rc = -ENOMEM;
1336                                 goto out;
1337                         }
1338
1339                         status->ls_size = s->ls_size;
1340                 }
1341                 status->ls_num_targets = s->ls_num_targets;
1342                 memcpy(status->ls_targets, s->ls_targets,
1343                        (PATH_MAX + 1) * s->ls_num_targets);
1344         }
1345         if (status->ls_last_recno == -1)
1346                 status->ls_last_recno = s->ls_last_recno;
1347
1348         if (status->ls_registration[0] == '\0')
1349                 strlcpy(status->ls_registration, s->ls_registration,
1350                         sizeof(status->ls_registration));
1351
1352         if (status->ls_mdt_device[0] == '\0')
1353                 strlcpy(status->ls_mdt_device, s->ls_mdt_device,
1354                         sizeof(status->ls_mdt_device));
1355
1356         if (status->ls_source_fs[0] == '\0')
1357                 strlcpy(status->ls_source_fs, s->ls_source_fs,
1358                         sizeof(status->ls_source_fs));
1359
1360         if (status->ls_source[0] == '\0')
1361                 strlcpy(status->ls_source, s->ls_source,
1362                         sizeof(status->ls_source));
1363
1364  out:
1365         if (fd != -1)
1366                 close(fd);
1367         if (s)
1368                 free(s);
1369         return rc;
1370 }
1371
1372 /* Clear changelogs every CLEAR_INTERVAL records or at the end of
1373    processing. */
1374 int lr_clear_cl(struct lr_info *info, int force)
1375 {
1376         char            mdt_device[LR_NAME_MAXLEN + 1];
1377         long long       rec;
1378         int             rc = 0;
1379
1380         if (force || info->recno > status->ls_last_recno + CLEAR_INTERVAL) {
1381                 if (info->type == CL_RENAME)
1382                         rec = info->recno + 1;
1383                 else
1384                         rec = info->recno;
1385                 if (!noclear && !dryrun) {
1386                         /* llapi_changelog_clear modifies the mdt
1387                          * device name so make a copy of it until this
1388                          * is fixed.
1389                         */
1390                         strlcpy(mdt_device, status->ls_mdt_device,
1391                                 sizeof(mdt_device));
1392                         rc = llapi_changelog_clear(mdt_device,
1393                                                    status->ls_registration,
1394                                                    rec);
1395                         if (rc)
1396                                 printf("Changelog clear (%s, %s, %lld) "
1397                                        "returned %d\n", status->ls_mdt_device,
1398                                        status->ls_registration, rec, rc);
1399                 }
1400                 if (!rc && !dryrun) {
1401                         status->ls_last_recno = rec;
1402                         lr_write_log();
1403
1404                 }
1405         }
1406
1407         return rc;
1408 }
1409
1410 /* Locate a usable version of rsync. At this point we'll use any
1411    version. */
1412 int lr_locate_rsync()
1413 {
1414         FILE *fp;
1415         int len;
1416
1417         /* Locate rsync */
1418         snprintf(rsync, PATH_MAX, "%s -p %s", TYPE, RSYNC);
1419         fp = popen(rsync, "r");
1420         if (fp == NULL)
1421                 return -1;
1422
1423         if (fgets(rsync, PATH_MAX, fp) == NULL) {
1424                 fclose(fp);
1425                 return -1;
1426         }
1427
1428         len = strlen(rsync);
1429         if (len > 0 && rsync[len - 1] == '\n')
1430                 rsync[len - 1] = '\0';
1431         fclose(fp);
1432
1433         /* Determine the version of rsync */
1434         snprintf(rsync_ver, PATH_MAX, "%s --version", rsync);
1435         fp = popen(rsync_ver, "r");
1436         if (fp == NULL)
1437                 return -1;
1438
1439         if (fgets(rsync_ver, PATH_MAX, fp) == NULL) {
1440                 fclose(fp);
1441                 return -1;
1442         }
1443         len = strlen(rsync_ver);
1444         if (len > 0 && rsync_ver[len - 1] == '\n')
1445                 rsync_ver[len - 1] = '\0';
1446         fclose(fp);
1447
1448         return 0;
1449
1450 }
1451
1452 /* Print the replication parameters */
1453 void lr_print_status(struct lr_info *info)
1454 {
1455         int i;
1456
1457         if (!verbose)
1458                 return;
1459
1460         printf("Lustre filesystem: %s\n", status->ls_source_fs);
1461         printf("MDT device: %s\n", status->ls_mdt_device);
1462         printf("Source: %s\n", status->ls_source);
1463         for (i = 0; i < status->ls_num_targets; i++)
1464                 printf("Target: %s\n", status->ls_targets[i]);
1465         if (statuslog != NULL)
1466                 printf("Statuslog: %s\n", statuslog);
1467         printf("Changelog registration: %s\n", status->ls_registration);
1468         printf("Starting changelog record: %jd\n",
1469                (uintmax_t)status->ls_last_recno);
1470         if (noxattr)
1471                 printf("Replicate xattrs: no\n");
1472         if (noclear)
1473                 printf("Clear changelog after use: no\n");
1474         if (use_rsync)
1475                 printf("Using rsync: %s (%s)\n", rsync, rsync_ver);
1476 }
1477
1478 void lr_print_failure(struct lr_info *info, int rc)
1479 {
1480         fprintf(stderr, "Replication of operation failed(%d):"
1481                 " %lld %s (%d) %s %s %s\n", rc, info->recno,
1482                 changelog_type2str(info->type), info->type, info->tfid,
1483                 info->pfid, info->name);
1484 }
1485
1486 /* Replicate filesystem operations from src_path to target_path */
1487 int lr_replicate()
1488 {
1489         void *changelog_priv;
1490         struct lr_info *info;
1491         struct lr_info *ext = NULL;
1492         time_t start;
1493         int xattr_not_supp;
1494         int i;
1495         int rc;
1496
1497         start = time(NULL);
1498
1499         info = calloc(1, sizeof(struct lr_info));
1500         if (info == NULL)
1501                 return -ENOMEM;
1502
1503         rc = llapi_search_fsname(status->ls_source, status->ls_source_fs);
1504         if (rc) {
1505                 fprintf(stderr, "Source path is not a valid Lustre client "
1506                         "mountpoint.\n");
1507                 goto out;
1508         }
1509         if (status->ls_mdt_device[0] == '\0')
1510                 snprintf(status->ls_mdt_device, LR_NAME_MAXLEN, "%s%s",
1511                         status->ls_source_fs, DEFAULT_MDT);
1512
1513         ext = calloc(1, sizeof(struct lr_info));
1514         if (ext == NULL) {
1515                 rc = -ENOMEM;
1516                 goto out;
1517         }
1518
1519         for (i = 0, xattr_not_supp = 0; i < status->ls_num_targets; i++) {
1520                 snprintf(info->dest, PATH_MAX, "%s/%s", status->ls_targets[i],
1521                         SPECIAL_DIR);
1522                 rc = mkdir(info->dest, 0777);
1523                 if (rc == -1 && errno != EEXIST) {
1524                         fprintf(stderr, "Error writing to target path %s.\n",
1525                                 status->ls_targets[i]);
1526                         rc = -errno;
1527                         goto out;
1528                 }
1529                 rc = llistxattr(info->src, info->xlist, info->xsize);
1530                 if (rc == -1 && errno == ENOTSUP) {
1531                         fprintf(stderr, "xattrs not supported on %s\n",
1532                                 status->ls_targets[i]);
1533                         xattr_not_supp++;
1534                 }
1535         }
1536         if (xattr_not_supp == status->ls_num_targets)
1537                 /* None of the targets support xattrs. */
1538                 noxattr = 1;
1539
1540         lr_print_status(info);
1541
1542         /* Open changelogs for consumption*/
1543         rc = llapi_changelog_start(&changelog_priv,
1544                                 CHANGELOG_FLAG_BLOCK |
1545                                 CHANGELOG_FLAG_JOBID |
1546                                 CHANGELOG_FLAG_EXTRA_FLAGS,
1547                                 status->ls_mdt_device, status->ls_last_recno);
1548         if (rc < 0) {
1549                 fprintf(stderr, "Error opening changelog file for fs %s.\n",
1550                         status->ls_source_fs);
1551                 goto out;
1552         }
1553
1554         while (!quit && lr_parse_line(changelog_priv, info) == 0) {
1555                 rc = 0;
1556                 if (info->type == CL_RENAME && !info->is_extended) {
1557                         /* Newer rename operations extends changelog to store
1558                          * source file information, but old changelog has
1559                          * another record.
1560                          */
1561                         if (lr_parse_line(changelog_priv, ext) != 0)
1562                                 break;
1563                         memcpy(info->sfid, info->tfid, sizeof(info->sfid));
1564                         memcpy(info->spfid, info->pfid, sizeof(info->spfid));
1565                         memcpy(info->tfid, ext->tfid, sizeof(info->tfid));
1566                         memcpy(info->pfid, ext->pfid, sizeof(info->pfid));
1567                         strlcpy(info->sname, info->name, sizeof(info->sname));
1568                         strlcpy(info->name, ext->name, sizeof(info->name));
1569                         info->is_extended = 1;
1570                 }
1571
1572                 if (dryrun)
1573                         continue;
1574
1575                 DEBUG_ENTRY(info);
1576
1577                 switch(info->type) {
1578                 case CL_CREATE:
1579                 case CL_MKDIR:
1580                 case CL_MKNOD:
1581                 case CL_SOFTLINK:
1582                         rc = lr_create(info);
1583                         break;
1584                 case CL_RMDIR:
1585                 case CL_UNLINK:
1586                         rc = lr_remove(info);
1587                         break;
1588                 case CL_RENAME:
1589                         rc = lr_move(info);
1590                         break;
1591                 case CL_HARDLINK:
1592                         rc = lr_link(info);
1593                         break;
1594                 case CL_TRUNC:
1595                 case CL_SETATTR:
1596                         rc = lr_setattr(info);
1597                         break;
1598                 case CL_XATTR:
1599                         rc = lr_setxattr(info);
1600                         break;
1601                 case CL_CLOSE:
1602                 case CL_EXT:
1603                 case CL_OPEN:
1604                 case CL_LAYOUT:
1605                 case CL_MARK:
1606                         /* Nothing needs to be done for these entries */
1607                         /* fallthrough */
1608                 default:
1609                         break;
1610                 }
1611                 DEBUG_EXIT(info, rc);
1612                 if (rc && rc != -ENOENT) {
1613                         lr_print_failure(info, rc);
1614                         errors++;
1615                         if (abort_on_err)
1616                                 break;
1617                 }
1618                 lr_clear_cl(info, 0);
1619                 if (debug) {
1620                         bzero(info, sizeof(struct lr_info));
1621                         bzero(ext, sizeof(struct lr_info));
1622                 }
1623         }
1624
1625         llapi_changelog_fini(&changelog_priv);
1626
1627         if (errors || verbose)
1628                 printf("Errors: %d\n", errors);
1629
1630         /* Clear changelog records used so far */
1631         lr_clear_cl(info, 1);
1632
1633         if (verbose) {
1634                 printf("lustre_rsync took %ld seconds\n", time(NULL) - start);
1635                 printf("Changelog records consumed: %lld\n", rec_count);
1636         }
1637
1638         rc = 0;
1639
1640 out:
1641         if (info != NULL)
1642                 free(info);
1643         if (ext != NULL)
1644                 free(ext);
1645
1646         return rc;
1647 }
1648
1649 void
1650 termination_handler (int signum)
1651 {
1652         /* Set a flag for the replicator to gracefully shutdown */
1653         quit = 1;
1654         printf("lustre_rsync halting.\n");
1655 }
1656
1657 int main(int argc, char *argv[])
1658 {
1659         int newsize;
1660         int numtargets = 0;
1661         int rc = 0;
1662
1663         if ((rc = lr_init_status()) != 0)
1664                 return rc;
1665
1666         while ((rc = getopt_long(argc, argv, "as:t:m:u:l:vx:zc:ry:n:d:D:",
1667                                  long_opts, NULL)) >= 0) {
1668                 switch (rc) {
1669                 case 'a':
1670                         /* Assume absolute paths */
1671                         abort_on_err++;
1672                         break;
1673                 case 's':
1674                         /* Assume absolute paths */
1675                         strlcpy(status->ls_source, optarg,
1676                                 sizeof(status->ls_source));
1677                         break;
1678                 case 't':
1679                         status->ls_num_targets++;
1680                         numtargets++;
1681                         if (numtargets != status->ls_num_targets) {
1682                                 /* Targets were read from a log
1683                                    file. The ones specified on the
1684                                    command line take precedence. The
1685                                    ones from the log file will be
1686                                    ignored. */
1687                                 status->ls_num_targets = numtargets;
1688                         }
1689                         newsize = sizeof (struct lustre_rsync_status) +
1690                                 (status->ls_num_targets * (PATH_MAX + 1));
1691                         if (status->ls_size != newsize) {
1692                                 status->ls_size = newsize;
1693                                 status = lr_grow_buf(status, newsize);
1694                                 if (status == NULL)
1695                                         return -ENOMEM;
1696                         }
1697                         strlcpy(status->ls_targets[status->ls_num_targets - 1],
1698                                 optarg, sizeof(status->ls_targets[0]));
1699                         break;
1700                 case 'm':
1701                         strlcpy(status->ls_mdt_device, optarg,
1702                                 sizeof(status->ls_mdt_device));
1703                         break;
1704                 case 'u':
1705                         strlcpy(status->ls_registration, optarg,
1706                                 sizeof(status->ls_registration));
1707                         break;
1708                 case 'l':
1709                         statuslog = optarg;
1710                         (void) lr_read_log();
1711                         break;
1712                 case 'v':
1713                         verbose++;
1714                         break;
1715                 case 'x':
1716                         if (strcmp("no", optarg) == 0) {
1717                                 noxattr = 1;
1718                         } else if (strcmp("yes", optarg) != 0) {
1719                                 printf("Invalid parameter %s. "
1720                                        "Specify --xattr=no or --xattr=yes\n",
1721                                        optarg);
1722                                 return -1;
1723                         }
1724                         break;
1725                 case 'z':
1726                         dryrun = 1;
1727                         break;
1728                 case 'c':
1729                         /* Undocumented option cl-clear */
1730                         if (strcmp("no", optarg) == 0) {
1731                                 noclear = 1;
1732                         } else if (strcmp("yes", optarg) != 0) {
1733                                 printf("Invalid parameter %s. "
1734                                        "Specify --cl-clear=no "
1735                                        "or --cl-clear=yes\n",
1736                                        optarg);
1737                                 return -1;
1738                         }
1739                         break;
1740                 case 'r':
1741                         /* Undocumented option use-rsync */
1742                         use_rsync = 1;
1743                         break;
1744                 case 'y':
1745                         /* Undocumented option rsync-threshold */
1746                         rsync_threshold = atol(optarg);
1747                         break;
1748                 case 'n':
1749                         /* Undocumented option start-recno */
1750                         status->ls_last_recno = atol(optarg);
1751                         break;
1752                 case 'd':
1753                         /* Undocumented option debug */
1754                         debug = atoi(optarg);
1755                         if (debug < 0 || debug > 2)
1756                                 debug = 0;
1757                         break;
1758                 case 'D':
1759                         /* Undocumented option debug log file */
1760                         if (debug_log != NULL)
1761                                 fclose(debug_log);
1762                         debug_log = fopen(optarg, "a");
1763                         if (debug_log == NULL) {
1764                                 printf("Cannot open %s for debug log\n",
1765                                        optarg);
1766                                 return -1;
1767                         }
1768                         break;
1769                 default:
1770                         fprintf(stderr, "error: %s: option '%s' "
1771                                 "unrecognized.\n", argv[0], argv[optind - 1]);
1772                         lr_usage();
1773                         return -1;
1774                 }
1775         }
1776
1777         if (status->ls_last_recno == -1)
1778                 status->ls_last_recno = 0;
1779         if (strnlen(status->ls_registration, LR_NAME_MAXLEN) == 0) {
1780                 /* No registration ID was passed in. */
1781                 printf("Please specify changelog consumer registration id.\n");
1782                 lr_usage();
1783                 return -1;
1784         }
1785         if (strnlen(status->ls_source, PATH_MAX) == 0) {
1786                 fprintf(stderr, "Please specify the source path.\n");
1787                 lr_usage();
1788                 return -1;
1789         }
1790         if (strnlen(status->ls_targets[0], PATH_MAX) == 0) {
1791                 fprintf(stderr, "Please specify the target path.\n");
1792                 lr_usage();
1793                 return -1;
1794         }
1795
1796         /* This plumbing is needed for some of the ioctls behind
1797            llapi calls to work. */
1798         register_ioc_dev(OBD_DEV_ID, OBD_DEV_PATH);
1799
1800         rc = lr_locate_rsync();
1801         if (use_rsync && rc != 0) {
1802                 fprintf(stderr, "Error: unable to locate %s.\n", RSYNC);
1803                 exit(-1);
1804         }
1805
1806         signal(SIGINT, termination_handler);
1807         signal(SIGHUP, termination_handler);
1808         signal(SIGTERM, termination_handler);
1809
1810         rc = lr_replicate();
1811
1812         if (debug_log != NULL)
1813                 fclose(debug_log);
1814         return rc;
1815 }