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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/utils/lustre_rsync.c
  37  *
  38  * Author: Kalpak Shah <Kalpak.Shah@Sun.COM>
  39  * Author: Manoj Joseph <Manoj.Joseph@Sun.COM>
  40  */
  41
  42 /*
  43  * - lustre_rsync is a tool for replicating a lustre filesystem.
  44  *
  45  * - The source-fs is a live lustre filesystem. It is not a
  46  * snapshot. It is mounted and undergoing changes
  47  *
  48  * - The target-fs is a copy of the source-fs from the past. Let's
  49  * call this point, the 'sync point'.
  50  *
  51  * - There is a changelog of all metadata operations that happened on
  52  * the filesystem since the 'sync point'.
  53  *
  54  * - lustre_rsync replicates all the operations saved in the changelog
  55  * on to the target filesystem to make it identical to the source.
  56  *
  57  * To facilitate replication, the lustre filesystem provides
  58  *    a) a way to get the current filesystem path of a given FID
  59  *    b) a way to open files by specifying its FID
  60  *
  61  * The changelog only has a limited amount of information.
  62  *  tfid - The FID of the target file
  63  *  pfid - The FID of the parent of the target file (at the time of
  64  *         the operation)
  65  *  sfid - The FID of the source file
  66  *  spfid - The FID of the parent of the source file
  67  *  name - The name of the target file (at the time of the operation), the name
  68  *         of the source file is appended (delimited with '\0') if this
  69  *         operation involves a source
  70  *
  71  * With just this information, it is not alwasy possible to determine
  72  * the file paths for each operation. For instance, if pfid does not
  73  * exist on the source-fs (due to a subsequent deletion), its path
  74  * cannot be queried. In such cases, lustre_rsync keeps the files in a
  75  * special directory ("/.lustrerepl"). Once all the operations in a
  76  * changelog are replayed, all the files in this special directory
  77  * will get moved to the location as in the source-fs.
  78  *
  79  * Shorthand used: f2p(fid) = fid2path(fid)
  80  *
  81  * The following are the metadata operations of interest.
  82  * 1. creat
  83  *    If tfid is absent on the source-fs, ignore this operation
  84  *    If pfid is absent on the source-fs [or]
  85  *    if f2p(pfid) is not present on target-fs [or]
  86  *    if f2p(pfid)+name != f2p(tfid)
  87  *      creat .lustrerepl/tfid
  88  *      track [pfid,tfid,name]
  89  *    Else
  90  *      creat f2p[tfid]
  91  *
  92  * 2. remove
  93  *    If .lustrerepl/[tfid] is present on the target
  94  *      rm .lustrerepl/[tfid]
  95  *    Else if pfid is present on the source-fs,
  96  *      if f2p(pfid)+name is present,
  97  *        rm f2p(pfid)+name
  98  *
  99  * 3. move (spfid,sname) to (pfid,name)
 100  *    If pfid is present
 101  *      if spfid is also present, mv (spfid,sname) to (pfid,name)
 102  *      else mv .lustrerepl/[sfid] to (pfid,name)
 103  *    Else if pfid is not present,
 104  *      if spfid is present, mv (spfid,sname) .lustrerepl/[sfid]
 105  *    If moving out of .lustrerepl
 106  *      move out all its children in .lustrerepl.
 107  *      [pfid,tfid,name] tracked from (1) is used for this.
 108  */
 109
 110 #include <stdio.h>
 111 #include <stdlib.h>
 112 #include <string.h>
 113 #include <unistd.h>
 114 #include <getopt.h>
 115 #include <stdarg.h>
 116 #include <fcntl.h>
 117 #include <signal.h>
 118 #include <sys/stat.h>
 119 #include <sys/types.h>
 120 #include <errno.h>
 121 #include <limits.h>
 122 #include <utime.h>
 123 #include <time.h>
 124 #include <sys/xattr.h>
 125
 126 #include <libcfs/util/string.h>
 127 #include <libcfs/util/parser.h>
 128 #include <lustre/lustreapi.h>
 129 #include <lustre/lustre_idl.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 extern int obd_initialize(int argc, char **argv);
 150
 151 /* Information for processing a changelog record. This structure is
 152    allocated on the heap instead of allocating large variables on the
 153    stack. */
 154 struct lr_info {
 155         long long recno;
 156         int target_no;
 157         unsigned int is_extended:1;
 158         enum changelog_rec_type type;
 159         char tfid[LR_FID_STR_LEN];
 160         char pfid[LR_FID_STR_LEN];
 161         char sfid[LR_FID_STR_LEN];
 162         char spfid[LR_FID_STR_LEN];
 163         char sname[NAME_MAX + 1];
 164         char name[NAME_MAX + 1];
 165         char src[PATH_MAX + 1];
 166         char dest[PATH_MAX + 1];
 167         char path[PATH_MAX + 1];
 168         char savedpath[PATH_MAX + 1];
 169         char link[PATH_MAX + 1];
 170         char linktmp[PATH_MAX + 1];
 171         char cmd[PATH_MAX];
 172         int bufsize;
 173         char *buf;
 174
 175         /* Variables for querying the xattributes */
 176         char *xlist;
 177         size_t xsize;
 178         char *xvalue;
 179         size_t xvsize;
 180 };
 181
 182 struct lr_parent_child_list {
 183         struct lr_parent_child_log pc_log;
 184         struct lr_parent_child_list *pc_next;
 185 };
 186
 187 struct lustre_rsync_status *status;
 188 char *statuslog;  /* Name of the status log file */
 189 int logbackedup;
 190 int noxattr;    /* Flag to turn off replicating xattrs */
 191 int noclear;    /* Flag to turn off clearing changelogs */
 192 int debug;      /* Flag to turn debugging information on and off */
 193 int verbose;    /* Verbose output */
 194 long long rec_count; /* No of changelog records that were processed */
 195 int errors;
 196 int dryrun;
 197 int use_rsync;  /* Flag to turn on use of rsync to copy data */
 198 long long rsync_threshold = DEFAULT_RSYNC_THRESHOLD;
 199 int quit;       /* Flag to stop processing the changelog; set on the
 200                    receipt of a signal */
 201 int abort_on_err = 0;
 202
 203 char rsync[PATH_MAX];
 204 char rsync_ver[PATH_MAX];
 205 struct lr_parent_child_list *parents;
 206
 207 FILE *debug_log;
 208
 209 /* Command line options */
 210 struct option long_opts[] = {
 211         {"source",      required_argument, 0, 's'},
 212         {"target",      required_argument, 0, 't'},
 213         {"mdt",         required_argument, 0, 'm'},
 214         {"user",        required_argument, 0, 'u'},
 215         {"statuslog",   required_argument, 0, 'l'},
 216         {"verbose",     no_argument,       0, 'v'},
 217         {"xattr",       required_argument, 0, 'x'},
 218         {"dry-run",     no_argument,       0, 'z'},
 219         /* Undocumented options follow */
 220         {"cl-clear",    required_argument, 0, 'c'},
 221         {"use-rsync",   no_argument,       0, 'r'},
 222         {"rsync-threshold", required_argument, 0, 'y'},
 223         {"start-recno", required_argument, 0, 'n'},
 224         {"abort-on-err",no_argument,       0, 'a'},
 225         {"debug",       required_argument, 0, 'd'},
 226         {"debuglog",    required_argument, 0, 'D'},
 227         {0, 0, 0, 0}
 228 };
 229
 230 /* Command line usage */
 231 void lr_usage()
 232 {
 233         fprintf(stderr, "\tlustre_rsync -s <lustre_root_path> -t <target_path> "
 234                 "-m <mdt> -r <user id> -l <status log>\n"
 235                 "lustre_rsync can also pick up parameters from a "
 236                 "status log created earlier.\n"
 237                 "\tlustre_rsync -l <log_file>\n"
 238                 "options:\n"
 239                 "\t--xattr <yes|no> replicate EAs\n"
 240                 "\t--abort-on-err   abort at first err\n"
 241                 "\t--verbose\n"
 242                 "\t--dry-run        don't write anything\n");
 243 }
 244
 245 #define DEBUG_ENTRY(info)                                                      \
 246         lr_debug(D_TRACE, "***** Start %lld %s (%d) %s %s %s *****\n",         \
 247                  (info)->recno, changelog_type2str((info)->type),              \
 248                  (info)->type, (info)->tfid, (info)->pfid, (info)->name);
 249
 250 #define DEBUG_EXIT(info, rc)                                                   \
 251         lr_debug(D_TRACE, "##### End %lld %s (%d) %s %s %s rc=%d #####\n",     \
 252                  (info)->recno, changelog_type2str((info)->type),              \
 253                  (info)->type, (info)->tfid, (info)->pfid, (info)->name, rc);
 254
 255 /* Print debug information. This is controlled by the value of the
 256    global variable 'debug' */
 257 void lr_debug(int level, const char *fmt, ...)
 258 {
 259         va_list ap;
 260
 261         if (level > debug)
 262                 return;
 263
 264         va_start(ap, fmt);
 265         if (debug_log != NULL)
 266                 vfprintf(debug_log, fmt, ap);
 267         else
 268                 vfprintf(stdout, fmt, ap);
 269         va_end(ap);
 270 }
 271
 272
 273 void * lr_grow_buf(void *buf, int size)
 274 {
 275         void *ptr;
 276
 277         ptr = realloc(buf, size);
 278         if (ptr == NULL)
 279                 free(buf);
 280         return ptr;
 281 }
 282
 283
 284 /* Use rsync to replicate file data */
 285 int lr_rsync_data(struct lr_info *info)
 286 {
 287         int rc;
 288         struct stat st_src, st_dest;
 289         char cmd[PATH_MAX];
 290
 291         lr_debug(DTRACE, "Syncing data%s\n", info->tfid);
 292
 293         rc = stat(info->src, &st_src);
 294         if (rc == -1) {
 295                 fprintf(stderr, "Error: Unable to stat src=%s %s\n",
 296                         info->src, info->name);
 297                 if (errno == ENOENT)
 298                         return 0;
 299                 else
 300                         return -errno;
 301         }
 302         rc = stat(info->dest, &st_dest);
 303         if (rc == -1) {
 304                 fprintf(stderr, "Error: Unable to stat dest=%s\n",
 305                         info->dest);
 306                 return -errno;
 307         }
 308
 309         if (st_src.st_mtime != st_dest.st_mtime ||
 310             st_src.st_size != st_dest.st_size) {
 311                 /* XXX spawning off an rsync for every data sync and
 312                  * waiting synchronously is bad for performance.
 313                  * librsync could possibly used here. But it does not
 314                  * seem to be of production grade. Multi-threaded
 315                  * replication is also to be considered.
 316                  */
 317                 int status;
 318                 snprintf(cmd, PATH_MAX, "%s --inplace %s %s", rsync, info->src,
 319                         info->dest);
 320                 lr_debug(DTRACE, "\t%s %s\n", cmd, info->tfid);
 321                 status = system(cmd);
 322                 if (status == -1) {
 323                         rc = -errno;
 324                 } else if (WIFEXITED(status)) {
 325                         status = WEXITSTATUS(status);
 326                         if (!status)
 327                                 rc = 0;
 328                         else if (status == 23 || status == 24)
 329                                 /* Error due to vanished source files;
 330                                    Ignore this error*/
 331                                 rc = 0;
 332                         else
 333                                 rc = -EINVAL;
 334                         if (status)
 335                                 lr_debug(DINFO, "rsync %s exited with %d %d\n",
 336                                          info->src, status, rc);
 337                 } else {
 338                         rc = -EINTR;
 339                 }
 340         } else {
 341                 lr_debug(DTRACE, "Not syncing %s and %s %s\n", info->src,
 342                          info->dest, info->tfid);
 343         }
 344
 345         return rc;
 346 }
 347
 348 int lr_copy_data(struct lr_info *info)
 349 {
 350         int fd_src = -1;
 351         int fd_dest = -1;
 352         int bufsize;
 353         int rsize;
 354         int rc = 0;
 355         struct stat st_src;
 356         struct stat st_dest;
 357
 358         fd_src = open(info->src, O_RDONLY);
 359         if (fd_src == -1)
 360                 return -errno;
 361         if (fstat(fd_src, &st_src) == -1 ||
 362             stat(info->dest, &st_dest) == -1)
 363                 goto out;
 364
 365         if (st_src.st_mtime == st_dest.st_mtime &&
 366             st_src.st_size == st_dest.st_size)
 367                 goto out;
 368
 369         if (st_src.st_size > rsync_threshold && rsync[0] != '\0') {
 370                 /* It is more efficient to use rsync to replicate
 371                    large files. Any file larger than rsync_threshold
 372                    is handed off to rsync. */
 373                 lr_debug(DTRACE, "Using rsync to replicate %s\n", info->tfid);
 374                 rc = lr_rsync_data(info);
 375                 goto out;
 376         }
 377
 378         fd_dest = open(info->dest, O_WRONLY | O_TRUNC, st_src.st_mode);
 379         if (fd_dest == -1) {
 380                 rc = -errno;
 381                 goto out;
 382         }
 383         bufsize = st_dest.st_blksize;
 384
 385         if (info->bufsize < bufsize) {
 386                 /* Grow buffer */
 387                 info->buf = lr_grow_buf(info->buf, bufsize);
 388                 if (info->buf == NULL) {
 389                         rc = -ENOMEM;
 390                         goto out;
 391                 }
 392                 info->bufsize = bufsize;
 393         }
 394
 395         while (1) {
 396                 char *buf;
 397                 int wsize;
 398
 399                 buf = info->buf;
 400                 rsize = read(fd_src, buf, bufsize);
 401                 if (rsize == 0) {
 402                         rc = 0;
 403                         break;
 404                 }
 405                 if (rsize < 0) {
 406                         rc = -errno;
 407                         break;
 408                 }
 409                 do {
 410                         wsize = write(fd_dest, buf, rsize);
 411                         if (wsize <= 0) {
 412                                 rc = -errno;
 413                                 break;
 414                         }
 415                         rsize -= wsize;
 416                         buf += wsize;
 417                 } while (rsize > 0);
 418         }
 419         fsync(fd_dest);
 420
 421 out:
 422         if (fd_src != -1)
 423                 close(fd_src);
 424         if (fd_dest != -1)
 425                 close(fd_dest);
 426
 427         return rc;
 428 }
 429
 430 /* Copy data from source to destination */
 431 int lr_sync_data(struct lr_info *info)
 432 {
 433         if (use_rsync)
 434                 return lr_rsync_data(info);
 435         else
 436                 return lr_copy_data(info);
 437 }
 438
 439 /* Copy all attributes from file src to file dest */
 440 int lr_copy_attr(char *src, char *dest)
 441 {
 442         struct stat st;
 443         struct utimbuf time;
 444
 445         if (stat(src, &st) == -1 ||
 446             chmod(dest, st.st_mode) == -1 ||
 447             chown(dest, st.st_uid, st.st_gid) == -1)
 448                 return -errno;
 449
 450         time.actime = st.st_atime;
 451         time.modtime = st.st_mtime;
 452         if (utime(dest, &time) == -1)
 453                 return -errno;
 454         return 0;
 455 }
 456
 457 /* Copy all xattrs from file info->src to info->dest */
 458 int lr_copy_xattr(struct lr_info *info)
 459 {
 460         size_t size = info->xsize;
 461         int start;
 462         int len;
 463         int rc;
 464
 465         if (noxattr)
 466                 return 0;
 467
 468         errno = 0;
 469         rc = llistxattr(info->src, info->xlist, size);
 470         lr_debug(DTRACE, "llistxattr(%s,%p) returned %d, errno=%d\n",
 471                  info->src, info->xlist, rc, errno);
 472         if ((rc > 0 && info->xlist == NULL) || errno == ERANGE) {
 473                 size = rc > PATH_MAX ? rc : PATH_MAX;
 474                 info->xlist = lr_grow_buf(info->xlist, size);
 475                 if (info->xlist == NULL)
 476                         return -ENOMEM;
 477                 info->xsize = size;
 478                 rc = llistxattr(info->src, info->xlist, size);
 479                 lr_debug(DTRACE, "llistxattr %s returned %d, errno=%d\n",
 480                          info->src, rc, errno);
 481         }
 482         if (rc < 0)
 483                 return rc;
 484
 485         len = rc;
 486         start = 0;
 487         while (start < len) {
 488                 size = info->xvsize;
 489                 rc = lgetxattr(info->src, info->xlist + start,
 490                                info->xvalue, size);
 491                 if (info->xvalue == NULL || errno == ERANGE) {
 492                         size = rc > PATH_MAX ? rc : PATH_MAX;
 493                         info->xvalue = lr_grow_buf(info->xvalue, size);
 494                         if (info->xvalue == NULL)
 495                                 return -ENOMEM;
 496                         info->xvsize = size;
 497                         rc = lgetxattr(info->src, info->xlist + start,
 498                                        info->xvalue, size);
 499                 }
 500                 lr_debug(DTRACE, "\t(%s,%d) rc=%p\n", info->xlist + start,
 501                          info->xvalue, rc);
 502                 if (rc > 0) {
 503                         size = rc;
 504                         rc = lsetxattr(info->dest, info->xlist + start,
 505                                        info->xvalue, size, 0);
 506                         lr_debug(DTRACE, "\tlsetxattr(), rc=%d, errno=%d\n",
 507                                  rc, errno);
 508                         if (rc == -1) {
 509                                 if (errno != ENOTSUP) {
 510                                         fprintf(stderr, "Error replicating "
 511                                                 " xattr for %s: %d\n",
 512                                                 info->dest, errno);
 513                                         errors++;
 514                                 }
 515                                 rc = 0;
 516                         }
 517                 }
 518                 start += strlen(info->xlist + start) + 1;
 519         }
 520
 521         lr_debug(DINFO, "setxattr: %s %s\n", info->src, info->dest);
 522
 523         return rc;
 524 }
 525
 526 /* Retrieve the filesystem path for a given FID and a given
 527    linkno. The path is returned in info->path */
 528 int lr_get_path_ln(struct lr_info *info, char *fidstr, int linkno)
 529 {
 530         long long recno = -1;
 531         int rc;
 532
 533         rc = llapi_fid2path(status->ls_source, fidstr, info->path,
 534                             PATH_MAX, &recno, &linkno);
 535         if (rc < 0 && rc != -ENOENT) {
 536                 fprintf(stderr, "fid2path error: (%s, %s) %d %s\n",
 537                         status->ls_source, fidstr, -rc, strerror(errno = -rc));
 538         }
 539
 540         return rc;
 541 }
 542
 543 /* Retrieve the filesystem path for a given FID. The path is returned
 544    in info->path */
 545 int lr_get_path(struct lr_info *info, char *fidstr)
 546 {
 547         return lr_get_path_ln(info, fidstr, 0);
 548 }
 549
 550 /* Generate the path for opening by FID */
 551 void lr_get_FID_PATH(char *mntpt, char *fidstr, char *buf, int bufsize)
 552 {
 553         /* Open-by-FID path is <mntpt>/.lustre/fid/[SEQ:OID:VER] */
 554         snprintf(buf, bufsize, "%s/%s/fid/%s", mntpt, dot_lustre_name,
 555                  fidstr);
 556         return;
 557 }
 558
 559 /* Read the symlink information into 'info->link' */
 560 int lr_get_symlink(struct lr_info *info)
 561 {
 562         int rc;
 563         char *link;
 564
 565         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
 566         rc = readlink(info->src, info->linktmp, PATH_MAX);
 567         if (rc > 0)
 568                 info->linktmp[rc] = '\0';
 569         else
 570                 return rc;
 571         lr_debug(DTRACE, "symlink: readlink returned %s\n", info->linktmp);
 572
 573         if (strncmp(info->linktmp, status->ls_source,
 574                     strlen(status->ls_source)) == 0) {
 575                 /* Strip source fs path and replace with target fs path. */
 576                 link = info->linktmp + strlen(status->ls_source);
 577                 snprintf(info->src, PATH_MAX, "%s%s",
 578                          status->ls_targets[info->target_no], link);
 579                 link = info->src;
 580         } else {
 581                 link = info->linktmp;
 582         }
 583         strlcpy(info->link, link, sizeof(info->link));
 584
 585         return rc;
 586 }
 587
 588 /* Create file/directory/device file/symlink. */
 589 int lr_mkfile(struct lr_info *info)
 590 {
 591         struct stat st;
 592         int rc = 0;
 593
 594         errno = 0;
 595         lr_debug(DINFO, "mkfile(%d) %s \n", info->type, info->dest);
 596         if (info->type == CL_MKDIR) {
 597                 rc = mkdir(info->dest, 0777);
 598         } else if (info->type == CL_SOFTLINK) {
 599                 lr_get_symlink(info);
 600                 rc = symlink(info->link, info->dest);
 601         } else if (info->type == CL_MKNOD) {
 602                 lr_get_FID_PATH(status->ls_source, info->tfid,
 603                                     info->src, PATH_MAX);
 604                 rc = stat(info->src, &st);
 605                 if (rc == -1) {
 606                         if (errno == ENOENT)
 607                                 return 0;
 608                         else
 609                                 return -errno;
 610                 }
 611                 rc = mknod(info->dest, st.st_mode, st.st_rdev);
 612         } else {
 613                 rc = mknod(info->dest, S_IFREG | 0777, 0);
 614         }
 615
 616         if (rc < 0) {
 617                 if (errno == EEXIST)
 618                         rc = 0;
 619                 else
 620                         return -errno;
 621         }
 622
 623         /* Sync data and attributes */
 624         if (info->type == CL_CREATE || info->type == CL_MKDIR) {
 625                 lr_debug(DTRACE, "Syncing data and attributes %s\n",
 626                          info->tfid);
 627                 (void) lr_copy_xattr(info);
 628                 if (info->type == CL_CREATE)
 629                         rc = lr_sync_data(info);
 630                 if (!rc)
 631                         rc = lr_copy_attr(info->src, info->dest);
 632
 633                 if (rc == -ENOENT)
 634                         /* Source file has disappeared. Not an error. */
 635                         rc = 0;
 636         } else {
 637                 lr_debug(DTRACE, "Not syncing data and attributes %s\n",
 638                          info->tfid);
 639         }
 640
 641         return rc;
 642 }
 643
 644 int lr_add_pc(const char *pfid, const char *tfid, const char *name)
 645 {
 646         struct lr_parent_child_list *p;
 647         size_t len;
 648
 649         p = calloc(1, sizeof(*p));
 650         if (p == NULL)
 651                 return -ENOMEM;
 652         len = strlcpy(p->pc_log.pcl_pfid, pfid, sizeof(p->pc_log.pcl_pfid));
 653         if (len >= sizeof(p->pc_log.pcl_pfid))
 654                 goto out_err;
 655         len = strlcpy(p->pc_log.pcl_tfid, tfid, sizeof(p->pc_log.pcl_tfid));
 656         if (len >= sizeof(p->pc_log.pcl_tfid))
 657                 goto out_err;
 658         len = strlcpy(p->pc_log.pcl_name, name, sizeof(p->pc_log.pcl_name));
 659         if (len >= sizeof(p->pc_log.pcl_name))
 660                 goto out_err;
 661
 662         p->pc_next = parents;
 663         parents = p;
 664         return 0;
 665
 666 out_err:
 667         free(p);
 668         return -E2BIG;
 669 }
 670
 671 void lr_cascade_move(const char *fid, const char *dest, struct lr_info *info)
 672 {
 673         struct lr_parent_child_list *curr, *prev;
 674         char *d;
 675         int rc;
 676
 677         d = calloc(1, PATH_MAX + 1);
 678         prev = curr = parents;
 679         while (curr) {
 680                 if (strcmp(curr->pc_log.pcl_pfid, fid) == 0) {
 681                         snprintf(d, PATH_MAX, "%s/%s", dest,
 682                                  curr->pc_log.pcl_name);
 683                         snprintf(info->src, PATH_MAX, "%s/%s/%s",
 684                                 status->ls_targets[info->target_no],
 685                                 SPECIAL_DIR, curr->pc_log.pcl_tfid);
 686                         rc = rename(info->src, d);
 687                         if (rc == -1) {
 688                                 fprintf(stderr, "Error renaming file "
 689                                         " %s to %s: %d\n",
 690                                         info->src, d, errno);
 691                                 errors++;
 692                         }
 693                         if (curr == parents)
 694                                 parents = curr->pc_next;
 695                         else
 696                                 prev->pc_next = curr->pc_next;
 697                         lr_cascade_move(curr->pc_log.pcl_tfid, d, info);
 698                         free(curr);
 699                         prev = curr = parents;
 700
 701                 } else {
 702                         prev = curr;
 703                         curr = curr->pc_next;
 704                 }
 705         }
 706
 707         free(d);
 708 }
 709
 710 /* remove [info->spfid, info->sfid] from parents */
 711 int lr_remove_pc(const char *pfid, const char *tfid)
 712 {
 713         struct lr_parent_child_list *curr, *prev;
 714
 715         for (prev = curr = parents; curr; prev = curr, curr = curr->pc_next) {
 716                 if (strcmp(curr->pc_log.pcl_pfid, pfid) == 0 &&
 717                     strcmp(curr->pc_log.pcl_tfid, tfid) == 0) {
 718                         if (curr == parents)
 719                                 parents = curr->pc_next;
 720                         else
 721                                 prev->pc_next = curr->pc_next;
 722                         free(curr);
 723                         break;
 724                 }
 725         }
 726         return 0;
 727 }
 728
 729 /* Create file under SPECIAL_DIR with its tfid as its name. */
 730 int lr_mk_special(struct lr_info *info)
 731 {
 732         int rc;
 733
 734         snprintf(info->dest, PATH_MAX, "%s/%s/%s",
 735                 status->ls_targets[info->target_no], SPECIAL_DIR,
 736                 info->tfid);
 737
 738         rc = lr_mkfile(info);
 739         if (rc)
 740                 return rc;
 741
 742         rc = lr_add_pc(info->pfid, info->tfid, info->name);
 743         return rc;
 744 }
 745
 746 /* Remove a file or directory */
 747 int lr_rmfile(struct lr_info *info)
 748 {
 749         int rc;
 750
 751         if (info->type == CL_RMDIR)
 752                 rc = rmdir(info->dest);
 753         else
 754                 rc = unlink(info->dest);
 755         if (rc == -1)
 756                 rc = -errno;
 757         return rc;
 758 }
 759
 760 /* Recursively remove directory and its contents */
 761 int lr_rm_recursive(struct lr_info *info)
 762 {
 763         int rc;
 764
 765         snprintf(info->cmd, PATH_MAX, "rm -rf %s", info->dest);
 766         rc = system(info->cmd);
 767         if (rc == -1)
 768                 rc = -errno;
 769
 770         return rc;
 771 }
 772
 773 /* Remove a file under SPECIAL_DIR with its tfid as its name. */
 774 int lr_rm_special(struct lr_info *info)
 775 {
 776         int rc;
 777
 778         snprintf(info->dest, PATH_MAX, "%s/%s/%s",
 779                  status->ls_targets[info->target_no], SPECIAL_DIR,
 780                  info->tfid);
 781         rc = lr_rmfile(info);
 782
 783         if (rc)
 784                 lr_debug(DINFO, "remove: %s; rc=%d, errno=%d\n",
 785                          info->dest, rc, errno);
 786         return rc;
 787 }
 788
 789 /* Replicate file and directory create events */
 790 int lr_create(struct lr_info *info)
 791 {
 792         int len;
 793         int rc1 = 0;
 794         int rc;
 795         int mkspecial = 0;
 796
 797         /* Is target FID present on the source? */
 798         rc = lr_get_path(info, info->tfid);
 799         if (rc == -ENOENT) {
 800                 /* Source file has disappeared. Not an error. */
 801                 lr_debug(DINFO, "create: tfid %s not found on"
 802                          "source-fs\n", info->tfid);
 803                 return 0;
 804         } else if (rc) {
 805                 return rc;
 806         }
 807         strcpy(info->savedpath, info->path);
 808
 809         /* Is parent FID present on the source */
 810         rc = lr_get_path(info, info->pfid);
 811         if (rc == -ENOENT) {
 812                 lr_debug(DINFO, "create: pfid %s not found on source-fs\n",
 813                          info->tfid);
 814                 mkspecial = 1;
 815         } else if (rc < 0) {
 816                 return rc;
 817         }
 818
 819         /* Is f2p(pfid)+name != f2p(tfid)? If not the file has moved. */
 820         len = strlen(info->path);
 821         if (len == 1 && info->path[0] == '/')
 822                 snprintf(info->dest, PATH_MAX, "%s", info->name);
 823         else if (len - 1 > 0 && info->path[len - 1] == '/')
 824                 snprintf(info->dest, PATH_MAX, "%s%s", info->path, info->name);
 825         else
 826                 snprintf(info->dest, PATH_MAX, "%s/%s", info->path, info->name);
 827
 828         lr_debug(DTRACE, "dest = %s; savedpath = %s\n", info->dest,
 829                  info->savedpath);
 830         if (strncmp(info->dest, info->savedpath, PATH_MAX) != 0) {
 831                 lr_debug(DTRACE, "create: file moved (%s). %s != %s\n",
 832                          info->tfid, info->dest, info->savedpath);
 833                 mkspecial = 1;
 834         }
 835
 836         /* Is f2p(pfid) present on the target? If not, the parent has
 837            moved */
 838         if (!mkspecial) {
 839                 snprintf(info->dest, PATH_MAX, "%s/%s", status->ls_targets[0],
 840                         info->path);
 841                 if (access(info->dest, F_OK) != 0) {
 842                         lr_debug(DTRACE, "create: parent %s not found\n",
 843                                 info->dest);
 844                         mkspecial = 1;
 845                 }
 846         }
 847         for (info->target_no = 0; info->target_no < status->ls_num_targets;
 848              info->target_no++) {
 849                 snprintf(info->dest, PATH_MAX, "%s/%s",
 850                         status->ls_targets[info->target_no], info->savedpath);
 851                 lr_get_FID_PATH(status->ls_source, info->tfid, info->src,
 852                                     PATH_MAX);
 853
 854                 if (!mkspecial)
 855                         rc1 = lr_mkfile(info);
 856                 if (mkspecial || rc1 == -ENOENT) {
 857                         rc1 = lr_mk_special(info);
 858                 }
 859                 if (rc1)
 860                         rc = rc1;
 861         }
 862         return rc;
 863 }
 864
 865 /* Replicate a file remove (rmdir/unlink) operation */
 866 int lr_remove(struct lr_info *info)
 867 {
 868         int rc = 0;
 869         int rc1;
 870
 871         for (info->target_no = 0; info->target_no < status->ls_num_targets;
 872              info->target_no++) {
 873
 874                 rc1 = lr_rm_special(info);
 875                 if (!rc1)
 876                         continue;
 877
 878                 rc1 = lr_get_path(info, info->pfid);
 879                 if (rc1 == -ENOENT) {
 880                         lr_debug(DINFO, "remove: pfid %s not found\n",
 881                                  info->pfid);
 882                         continue;
 883                 }
 884                 if (rc1) {
 885                         rc = rc1;
 886                         continue;
 887                 }
 888                 snprintf(info->dest, PATH_MAX, "%s/%s/%s",
 889                         status->ls_targets[info->target_no], info->path,
 890                         info->name);
 891
 892                 rc1 = lr_rmfile(info);
 893                 lr_debug(DINFO, "remove: %s; rc1=%d, errno=%d\n",
 894                          info->dest, rc1, errno);
 895                 if (rc1 == -ENOTEMPTY)
 896                         rc1 = lr_rm_recursive(info);
 897
 898                 if (rc1) {
 899                         rc = rc1;
 900                         continue;
 901                 }
 902         }
 903         return rc;
 904 }
 905
 906 /* Replicate a rename/move operation. */
 907 int lr_move(struct lr_info *info)
 908 {
 909         int rc = 0;
 910         int rc1;
 911         int rc_dest, rc_src;
 912         int special_src = 0;
 913         int special_dest = 0;
 914         char srcpath[PATH_MAX + 1] = "";
 915
 916         LASSERT(info->is_extended);
 917
 918         rc_src = lr_get_path(info, info->spfid);
 919         if (rc_src < 0 && rc_src != -ENOENT)
 920                 return rc_src;
 921         memcpy(srcpath, info->path, strlen(info->path));
 922
 923         rc_dest = lr_get_path(info, info->pfid);
 924         if (rc_dest < 0 && rc_dest != -ENOENT)
 925                 return rc_dest;
 926
 927         for (info->target_no = 0; info->target_no < status->ls_num_targets;
 928              info->target_no++) {
 929
 930                 if (!rc_dest) {
 931                         snprintf(info->dest, PATH_MAX, "%s/%s",
 932                                 status->ls_targets[info->target_no],
 933                                 info->path);
 934                         if (access(info->dest, F_OK) != 0) {
 935                                 rc_dest = -errno;
 936                         } else {
 937                                 snprintf(info->dest, PATH_MAX, "%s/%s/%s",
 938                                         status->ls_targets[info->target_no],
 939                                         info->path, info->name);
 940                         }
 941                         lr_debug(DINFO, "dest path %s rc_dest=%d\n", info->dest,
 942                                  rc_dest);
 943                 }
 944                 if (rc_dest == -ENOENT) {
 945                         snprintf(info->dest, PATH_MAX, "%s/%s/%s",
 946                                 status->ls_targets[info->target_no],
 947                                 SPECIAL_DIR, info->sfid);
 948                         special_dest = 1;
 949                         lr_debug(DINFO, "special dest %s\n", info->dest);
 950                 }
 951
 952                 if (!rc_src) {
 953                         snprintf(info->src, PATH_MAX, "%s/%s/%s",
 954                                 status->ls_targets[info->target_no],
 955                                 srcpath, info->sname);
 956                         lr_debug(DINFO, "src path %s rc_src=%d\n", info->src,
 957                                  rc_src);
 958                 }
 959                 if (rc_src == -ENOENT || (access(info->src, F_OK) != 0 &&
 960                                           errno == ENOENT)) {
 961                         snprintf(info->src, PATH_MAX, "%s/%s/%s",
 962                                 status->ls_targets[info->target_no],
 963                                 SPECIAL_DIR, info->sfid);
 964                         special_src = 1;
 965                         lr_debug(DINFO, "special src %s\n", info->src);
 966                 }
 967
 968                 rc1 = 0;
 969                 errno = 0;
 970                 if (strcmp(info->src, info->dest) != 0) {
 971                         rc1 = rename(info->src, info->dest);
 972                         if (rc1 == -1)
 973                                 rc1 = -errno;
 974                         lr_debug(DINFO, "rename returns %d\n", rc1);
 975                 }
 976
 977                 if (special_src)
 978                         rc1 = lr_remove_pc(info->spfid, info->sfid);
 979
 980                 if (!special_dest)
 981                         lr_cascade_move(info->sfid, info->dest, info);
 982                 else
 983                         rc1 = lr_add_pc(info->pfid, info->sfid, info->name);
 984
 985                 lr_debug(DINFO, "move: %s [to] %s rc1=%d, errno=%d\n",
 986                          info->src, info->dest, rc1, errno);
 987                 if (rc1)
 988                         rc = rc1;
 989         }
 990         return rc;
 991 }
 992
 993 /* Replicate a hard link */
 994 int lr_link(struct lr_info *info)
 995 {
 996         int i;
 997         int rc;
 998         int rc1;
 999         struct stat st;
1000
1001         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
1002         rc = stat(info->src, &st);
1003         if (rc == -1)
1004                 return -errno;
1005
1006         for (info->target_no = 0; info->target_no < status->ls_num_targets;
1007              info->target_no++) {
1008
1009                 info->src[0] = 0;
1010                 info->dest[0] = 0;
1011                 rc1 = 0;
1012
1013                 /*
1014                  * The changelog record has the new parent directory FID and
1015                  * name of the target file. So info->dest can be constructed
1016                  * by getting the path of the new parent directory and
1017                  * appending the target file name.
1018                  */
1019                 rc1 = lr_get_path(info, info->pfid);
1020                 lr_debug(rc1 ? 0 : DTRACE, "\tparent fid2path %s, %s, rc=%d\n",
1021                          info->path, info->name, rc1);
1022
1023                 if (rc1 == 0) {
1024                         snprintf(info->dest, sizeof(info->dest), "%s/%s/%s",
1025                                  status->ls_targets[info->target_no],
1026                                  info->path, info->name);
1027                         lr_debug(DINFO, "link destination is %s\n", info->dest);
1028                 }
1029
1030                 /* Search through the hardlinks to get the src */
1031                 for (i = 0; i < st.st_nlink && info->src[0] == 0; i++) {
1032                         rc1 = lr_get_path_ln(info, info->tfid, i);
1033                         lr_debug(rc1 ? 0:DTRACE, "\tfid2path %s, %s, %d rc=%d\n",
1034                                  info->path, info->name, i, rc1);
1035                         if (rc1)
1036                                 break;
1037
1038                         /*
1039                          * Compare the path of target FID with info->dest
1040                          * to find out info->src.
1041                          */
1042                         char srcpath[PATH_MAX];
1043
1044                         snprintf(srcpath, sizeof(srcpath), "%s/%s",
1045                                  status->ls_targets[info->target_no],
1046                                  info->path);
1047
1048                         if (strcmp(srcpath, info->dest) != 0) {
1049                                 strlcpy(info->src, srcpath, sizeof(info->src));
1050                                 lr_debug(DINFO, "link source is %s\n",
1051                                          info->src);
1052                         }
1053                 }
1054
1055                 if (rc1) {
1056                         rc = rc1;
1057                         continue;
1058                 }
1059
1060                 if (info->src[0] == 0)
1061                         snprintf(info->src, PATH_MAX, "%s/%s/%s",
1062                                 status->ls_targets[info->target_no],
1063                                 SPECIAL_DIR, info->tfid);
1064                 else if (info->dest[0] == 0)
1065                         snprintf(info->dest, PATH_MAX, "%s/%s/%s",
1066                                 status->ls_targets[info->target_no],
1067                                 SPECIAL_DIR, info->tfid);
1068
1069                 rc1 = link(info->src, info->dest);
1070                 lr_debug(DINFO, "link: %s [to] %s; rc1=%d %s\n",
1071                          info->src, info->dest, rc1,
1072                          strerror(rc1 ? errno : 0));
1073
1074                 if (rc1)
1075                         rc = rc1;
1076         }
1077         return rc;
1078 }
1079
1080 /* Replicate file attributes */
1081 int lr_setattr(struct lr_info *info)
1082 {
1083         int rc1;
1084         int rc;
1085
1086         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
1087
1088         rc = lr_get_path(info, info->tfid);
1089         if (rc == -ENOENT)
1090                 lr_debug(DINFO, "setattr: %s not present on source-fs\n",
1091                          info->src);
1092         if (rc)
1093                 return rc;
1094
1095         for (info->target_no = 0; info->target_no < status->ls_num_targets;
1096              info->target_no++) {
1097
1098                 snprintf(info->dest, PATH_MAX, "%s/%s",
1099                          status->ls_targets[info->target_no], info->path);
1100                 lr_debug(DINFO, "setattr: %s %s %s", info->src, info->dest,
1101                          info->tfid);
1102
1103                 rc1 = lr_sync_data(info);
1104                 if (!rc1)
1105                         rc1 = lr_copy_attr(info->src, info->dest);
1106                 if (rc1)
1107                         rc = rc1;
1108         }
1109         return rc;
1110 }
1111
1112 /* Replicate xattrs */
1113 int lr_setxattr(struct lr_info *info)
1114 {
1115         int rc, rc1;
1116
1117         lr_get_FID_PATH(status->ls_source, info->tfid, info->src, PATH_MAX);
1118
1119         rc = lr_get_path(info, info->tfid);
1120         if (rc == -ENOENT)
1121                 lr_debug(DINFO, "setxattr: %s not present on source-fs\n",
1122                          info->src);
1123         if (rc)
1124                 return rc;
1125
1126         for (info->target_no = 0; info->target_no < status->ls_num_targets;
1127              info->target_no++) {
1128
1129                 snprintf(info->dest, PATH_MAX, "%s/%s",
1130                         status->ls_targets[info->target_no], info->path);
1131                 lr_debug(DINFO, "setxattr: %s %s %s\n", info->src, info->dest,
1132                          info->tfid);
1133
1134                 rc1 = lr_copy_xattr(info);
1135                 if (rc1)
1136                         rc = rc1;
1137         }
1138
1139         return rc;
1140 }
1141
1142 /* Parse a line of changelog entry */
1143 int lr_parse_line(void *priv, struct lr_info *info)
1144 {
1145         struct changelog_rec            *rec;
1146         struct changelog_ext_rename     *rnm;
1147         size_t                           namelen;
1148         size_t                           copylen = sizeof(info->name);
1149
1150         if (llapi_changelog_recv(priv, &rec) != 0)
1151                 return -1;
1152
1153         info->is_extended = !!(rec->cr_flags & CLF_RENAME);
1154         info->recno = rec->cr_index;
1155         info->type = rec->cr_type;
1156         snprintf(info->tfid, sizeof(info->tfid), DFID, PFID(&rec->cr_tfid));
1157         snprintf(info->pfid, sizeof(info->pfid), DFID, PFID(&rec->cr_pfid));
1158
1159         namelen = strnlen(changelog_rec_name(rec), rec->cr_namelen);
1160         if (copylen > namelen + 1)
1161                 copylen = namelen + 1;
1162         strlcpy(info->name, changelog_rec_name(rec), copylen);
1163
1164         /* Don't use rnm if CLF_RENAME isn't set */
1165         rnm = changelog_rec_rename(rec);
1166         if (rec->cr_flags & CLF_RENAME && !fid_is_zero(&rnm->cr_sfid)) {
1167                 copylen = sizeof(info->sname);
1168
1169                 snprintf(info->sfid, sizeof(info->sfid), DFID,
1170                          PFID(&rnm->cr_sfid));
1171                 snprintf(info->spfid, sizeof(info->spfid), DFID,
1172                          PFID(&rnm->cr_spfid));
1173                 namelen = changelog_rec_snamelen(rec);
1174                 if (copylen > namelen + 1)
1175                         copylen = namelen + 1;
1176                 strlcpy(info->sname, changelog_rec_sname(rec), copylen);
1177
1178                 if (verbose > 1)
1179                         printf("Rec %lld: %d %s %s\n", info->recno, info->type,
1180                                 info->name, info->sname);
1181         } else {
1182                 if (verbose > 1)
1183                         printf("Rec %lld: %d %s\n", info->recno, info->type,
1184                                 info->name);
1185         }
1186
1187         llapi_changelog_free(&rec);
1188
1189         rec_count++;
1190         return 0;
1191 }
1192
1193 /* Initialize the replication parameters */
1194 int lr_init_status()
1195 {
1196         size_t size = sizeof(struct lustre_rsync_status) + PATH_MAX + 1;
1197
1198         if (status != NULL)
1199                 return 0;
1200         status = calloc(size, 1);
1201         if (status == NULL)
1202                 return -ENOMEM;
1203         status->ls_version = REPLICATE_STATUS_VER;
1204         status->ls_size = size;
1205         status->ls_last_recno = -1;
1206         return 0;
1207 }
1208
1209 /* Make a backup of the statuslog */
1210 void lr_backup_log()
1211 {
1212         char backupfile[PATH_MAX];
1213
1214         if (logbackedup)
1215                 return;
1216         snprintf(backupfile, PATH_MAX, "%s.old", statuslog);
1217         (void) rename(statuslog, backupfile);
1218         logbackedup = 1;
1219
1220         return;
1221 }
1222
1223 /* Save replication parameters to a statuslog. */
1224 int lr_write_log()
1225 {
1226         int fd;
1227         size_t size;
1228         size_t write_size = status->ls_size;
1229         struct lr_parent_child_list *curr;
1230         int rc = 0;
1231
1232         if (statuslog == NULL)
1233                 return 0;
1234
1235         lr_backup_log();
1236
1237         fd = open(statuslog, O_WRONLY | O_CREAT | O_SYNC,
1238                              S_IRUSR | S_IWUSR);
1239         if (fd == -1) {
1240                 fprintf(stderr, "Error opening log file for writing (%s)\n",
1241                         statuslog);
1242                 return -1;
1243         }
1244         errno = 0;
1245         size = write(fd, status, write_size);
1246         if (size != write_size) {
1247                 fprintf(stderr, "Error writing to log file (%s) %d\n",
1248                         statuslog, errno);
1249                 close(fd);
1250                 return -1;
1251         }
1252
1253         for (curr = parents; curr; curr = curr->pc_next) {
1254                 size = write(fd, &curr->pc_log, sizeof(curr->pc_log));
1255                 if (size != sizeof(curr->pc_log)) {
1256                         fprintf(stderr, "Error writing to log file (%s) %d\n",
1257                                 statuslog, errno);
1258                         rc = -1;
1259                         break;
1260                 }
1261         }
1262         close(fd);
1263         return rc;
1264 }
1265
1266 /* Read statuslog and populate the replication parameters.  Command
1267  * line parameters take precedence over parameters in the log file.*/
1268 int lr_read_log()
1269 {
1270         struct lr_parent_child_list *tmp;
1271         struct lr_parent_child_log rec;
1272         struct lustre_rsync_status *s;
1273         int fd = -1;
1274         size_t size;
1275         size_t read_size = sizeof(struct lustre_rsync_status) + PATH_MAX + 1;
1276         int rc = 0;
1277
1278         if (statuslog == NULL)
1279                 return 0;
1280
1281         s = calloc(1, read_size);
1282         if (s == NULL) {
1283                 rc = -ENOMEM;
1284                 goto out;
1285         }
1286
1287         fd = open(statuslog, O_RDONLY);
1288         if (fd == -1) {
1289                 rc = -errno;
1290                 goto out;
1291         }
1292
1293         size = read(fd, s, read_size);
1294         if (size != read_size) {
1295                 rc = -EINVAL;
1296                 goto out;
1297         }
1298
1299         if (read_size < s->ls_size) {
1300                 read_size = s->ls_size;
1301                 s = lr_grow_buf(s, read_size);
1302                 if (s == NULL) {
1303                         rc = -ENOMEM;
1304                         goto out;
1305                 }
1306
1307                 if (lseek(fd, 0, SEEK_SET) == -1) {
1308                         rc = -ENOMEM;
1309                         goto out;
1310                 }
1311
1312                 size = read(fd, s, read_size);
1313                 if (size != read_size) {
1314                         rc = -EINVAL;
1315                         goto out;
1316                 }
1317         }
1318
1319         while (read(fd, &rec, sizeof(rec)) != 0) {
1320                 tmp = calloc(1, sizeof(*tmp));
1321                 if (!tmp) {
1322                         rc = -ENOMEM;
1323                         goto out;
1324                 }
1325
1326                 tmp->pc_log = rec;
1327                 tmp->pc_next = parents;
1328                 parents = tmp;
1329         }
1330
1331         /* copy uninitialized fields to status */
1332         if (status->ls_num_targets == 0) {
1333                 if (status->ls_size != s->ls_size) {
1334                         status = lr_grow_buf(status, s->ls_size);
1335                         if (status == NULL) {
1336                                 rc = -ENOMEM;
1337                                 goto out;
1338                         }
1339
1340                         status->ls_size = s->ls_size;
1341                 }
1342                 status->ls_num_targets = s->ls_num_targets;
1343                 memcpy(status->ls_targets, s->ls_targets,
1344                        (PATH_MAX + 1) * s->ls_num_targets);
1345         }
1346         if (status->ls_last_recno == -1)
1347                 status->ls_last_recno = s->ls_last_recno;
1348
1349         if (status->ls_registration[0] == '\0')
1350                 strlcpy(status->ls_registration, s->ls_registration,
1351                         sizeof(status->ls_registration));
1352
1353         if (status->ls_mdt_device[0] == '\0')
1354                 strlcpy(status->ls_mdt_device, s->ls_mdt_device,
1355                         sizeof(status->ls_mdt_device));
1356
1357         if (status->ls_source_fs[0] == '\0')
1358                 strlcpy(status->ls_source_fs, s->ls_source_fs,
1359                         sizeof(status->ls_source_fs));
1360
1361         if (status->ls_source[0] == '\0')
1362                 strlcpy(status->ls_source, s->ls_source,
1363                         sizeof(status->ls_source));
1364
1365  out:
1366         if (fd != -1)
1367                 close(fd);
1368         if (s)
1369                 free(s);
1370         return rc;
1371 }
1372
1373 /* Clear changelogs every CLEAR_INTERVAL records or at the end of
1374    processing. */
1375 int lr_clear_cl(struct lr_info *info, int force)
1376 {
1377         char            mdt_device[LR_NAME_MAXLEN + 1];
1378         long long       rec;
1379         int             rc = 0;
1380
1381         if (force || info->recno > status->ls_last_recno + CLEAR_INTERVAL) {
1382                 if (info->type == CL_RENAME)
1383                         rec = info->recno + 1;
1384                 else
1385                         rec = info->recno;
1386                 if (!noclear && !dryrun) {
1387                         /* llapi_changelog_clear modifies the mdt
1388                          * device name so make a copy of it until this
1389                          * is fixed.
1390                         */
1391                         strlcpy(mdt_device, status->ls_mdt_device,
1392                                 sizeof(mdt_device));
1393                         rc = llapi_changelog_clear(mdt_device,
1394                                                    status->ls_registration,
1395                                                    rec);
1396                         if (rc)
1397                                 printf("Changelog clear (%s, %s, %lld) "
1398                                        "returned %d\n", status->ls_mdt_device,
1399                                        status->ls_registration, rec, rc);
1400                 }
1401                 if (!rc && !dryrun) {
1402                         status->ls_last_recno = rec;
1403                         lr_write_log();
1404
1405                 }
1406         }
1407
1408         return rc;
1409 }
1410
1411 /* Locate a usable version of rsync. At this point we'll use any
1412    version. */
1413 int lr_locate_rsync()
1414 {
1415         FILE *fp;
1416         int len;
1417
1418         /* Locate rsync */
1419         snprintf(rsync, PATH_MAX, "%s -p %s", TYPE, RSYNC);
1420         fp = popen(rsync, "r");
1421         if (fp == NULL)
1422                 return -1;
1423
1424         if (fgets(rsync, PATH_MAX, fp) == NULL) {
1425                 fclose(fp);
1426                 return -1;
1427         }
1428
1429         len = strlen(rsync);
1430         if (len > 0 && rsync[len - 1] == '\n')
1431                 rsync[len - 1] = '\0';
1432         fclose(fp);
1433
1434         /* Determine the version of rsync */
1435         snprintf(rsync_ver, PATH_MAX, "%s --version", rsync);
1436         fp = popen(rsync_ver, "r");
1437         if (fp == NULL)
1438                 return -1;
1439
1440         if (fgets(rsync_ver, PATH_MAX, fp) == NULL) {
1441                 fclose(fp);
1442                 return -1;
1443         }
1444         len = strlen(rsync_ver);
1445         if (len > 0 && rsync_ver[len - 1] == '\n')
1446                 rsync_ver[len - 1] = '\0';
1447         fclose(fp);
1448
1449         return 0;
1450
1451 }
1452
1453 /* Print the replication parameters */
1454 void lr_print_status(struct lr_info *info)
1455 {
1456         int i;
1457
1458         if (!verbose)
1459                 return;
1460
1461         printf("Lustre filesystem: %s\n", status->ls_source_fs);
1462         printf("MDT device: %s\n", status->ls_mdt_device);
1463         printf("Source: %s\n", status->ls_source);
1464         for (i = 0; i < status->ls_num_targets; i++)
1465                 printf("Target: %s\n", status->ls_targets[i]);
1466         if (statuslog != NULL)
1467                 printf("Statuslog: %s\n", statuslog);
1468         printf("Changelog registration: %s\n", status->ls_registration);
1469         printf("Starting changelog record: %jd\n",
1470                (uintmax_t)status->ls_last_recno);
1471         if (noxattr)
1472                 printf("Replicate xattrs: no\n");
1473         if (noclear)
1474                 printf("Clear changelog after use: no\n");
1475         if (use_rsync)
1476                 printf("Using rsync: %s (%s)\n", rsync, rsync_ver);
1477 }
1478
1479 void lr_print_failure(struct lr_info *info, int rc)
1480 {
1481         fprintf(stderr, "Replication of operation failed(%d):"
1482                 " %lld %s (%d) %s %s %s\n", rc, info->recno,
1483                 changelog_type2str(info->type), info->type, info->tfid,
1484                 info->pfid, info->name);
1485 }
1486
1487 /* Replicate filesystem operations from src_path to target_path */
1488 int lr_replicate()
1489 {
1490         void *changelog_priv;
1491         struct lr_info *info;
1492         struct lr_info *ext = NULL;
1493         time_t start;
1494         int xattr_not_supp;
1495         int i;
1496         int rc;
1497
1498         start = time(NULL);
1499
1500         info = calloc(1, sizeof(struct lr_info));
1501         if (info == NULL)
1502                 return -ENOMEM;
1503
1504         rc = llapi_search_fsname(status->ls_source, status->ls_source_fs);
1505         if (rc) {
1506                 fprintf(stderr, "Source path is not a valid Lustre client "
1507                         "mountpoint.\n");
1508                 goto out;
1509         }
1510         if (status->ls_mdt_device[0] == '\0')
1511                 snprintf(status->ls_mdt_device, LR_NAME_MAXLEN, "%s%s",
1512                         status->ls_source_fs, DEFAULT_MDT);
1513
1514         ext = calloc(1, sizeof(struct lr_info));
1515         if (ext == NULL) {
1516                 rc = -ENOMEM;
1517                 goto out;
1518         }
1519
1520         for (i = 0, xattr_not_supp = 0; i < status->ls_num_targets; i++) {
1521                 snprintf(info->dest, PATH_MAX, "%s/%s", status->ls_targets[i],
1522                         SPECIAL_DIR);
1523                 rc = mkdir(info->dest, 0777);
1524                 if (rc == -1 && errno != EEXIST) {
1525                         fprintf(stderr, "Error writing to target path %s.\n",
1526                                 status->ls_targets[i]);
1527                         rc = -errno;
1528                         goto out;
1529                 }
1530                 rc = llistxattr(info->src, info->xlist, info->xsize);
1531                 if (rc == -1 && errno == ENOTSUP) {
1532                         fprintf(stderr, "xattrs not supported on %s\n",
1533                                 status->ls_targets[i]);
1534                         xattr_not_supp++;
1535                 }
1536         }
1537         if (xattr_not_supp == status->ls_num_targets)
1538                 /* None of the targets support xattrs. */
1539                 noxattr = 1;
1540
1541         lr_print_status(info);
1542
1543         /* Open changelogs for consumption*/
1544         rc = llapi_changelog_start(&changelog_priv,
1545                                 CHANGELOG_FLAG_BLOCK | CHANGELOG_FLAG_JOBID,
1546                                 status->ls_mdt_device, status->ls_last_recno);
1547         if (rc < 0) {
1548                 fprintf(stderr, "Error opening changelog file for fs %s.\n",
1549                         status->ls_source_fs);
1550                 goto out;
1551         }
1552
1553         while (!quit && lr_parse_line(changelog_priv, info) == 0) {
1554                 rc = 0;
1555                 if (info->type == CL_RENAME && !info->is_extended) {
1556                         /* Newer rename operations extends changelog to store
1557                          * source file information, but old changelog has
1558                          * another record.
1559                          */
1560                         if (lr_parse_line(changelog_priv, ext) != 0)
1561                                 break;
1562                         memcpy(info->sfid, info->tfid, sizeof(info->sfid));
1563                         memcpy(info->spfid, info->pfid, sizeof(info->spfid));
1564                         memcpy(info->tfid, ext->tfid, sizeof(info->tfid));
1565                         memcpy(info->pfid, ext->pfid, sizeof(info->pfid));
1566                         strlcpy(info->sname, info->name, sizeof(info->sname));
1567                         strlcpy(info->name, ext->name, sizeof(info->name));
1568                         info->is_extended = 1;
1569                 }
1570
1571                 if (dryrun)
1572                         continue;
1573
1574                 DEBUG_ENTRY(info);
1575
1576                 switch(info->type) {
1577                 case CL_CREATE:
1578                 case CL_MKDIR:
1579                 case CL_MKNOD:
1580                 case CL_SOFTLINK:
1581                         rc = lr_create(info);
1582                         break;
1583                 case CL_RMDIR:
1584                 case CL_UNLINK:
1585                         rc = lr_remove(info);
1586                         break;
1587                 case CL_RENAME:
1588                         rc = lr_move(info);
1589                         break;
1590                 case CL_HARDLINK:
1591                         rc = lr_link(info);
1592                         break;
1593                 case CL_TRUNC:
1594                 case CL_SETATTR:
1595                         rc = lr_setattr(info);
1596                         break;
1597                 case CL_XATTR:
1598                         rc = lr_setxattr(info);
1599                         break;
1600                 case CL_CLOSE:
1601                 case CL_EXT:
1602                 case CL_OPEN:
1603                 case CL_LAYOUT:
1604                 case CL_MARK:
1605                         /* Nothing needs to be done for these entries */
1606                         /* fallthrough */
1607                 default:
1608                         break;
1609                 }
1610                 DEBUG_EXIT(info, rc);
1611                 if (rc && rc != -ENOENT) {
1612                         lr_print_failure(info, rc);
1613                         errors++;
1614                         if (abort_on_err)
1615                                 break;
1616                 }
1617                 lr_clear_cl(info, 0);
1618                 if (debug) {
1619                         bzero(info, sizeof(struct lr_info));
1620                         bzero(ext, sizeof(struct lr_info));
1621                 }
1622         }
1623
1624         llapi_changelog_fini(&changelog_priv);
1625
1626         if (errors || verbose)
1627                 printf("Errors: %d\n", errors);
1628
1629         /* Clear changelog records used so far */
1630         lr_clear_cl(info, 1);
1631
1632         if (verbose) {
1633                 printf("lustre_rsync took %ld seconds\n", time(NULL) - start);
1634                 printf("Changelog records consumed: %lld\n", rec_count);
1635         }
1636
1637         rc = 0;
1638
1639 out:
1640         if (info != NULL)
1641                 free(info);
1642         if (ext != NULL)
1643                 free(ext);
1644
1645         return rc;
1646 }
1647
1648 void
1649 termination_handler (int signum)
1650 {
1651         /* Set a flag for the replicator to gracefully shutdown */
1652         quit = 1;
1653         printf("lustre_rsync halting.\n");
1654 }
1655
1656 int main(int argc, char *argv[])
1657 {
1658         int newsize;
1659         int numtargets = 0;
1660         int rc = 0;
1661
1662         if ((rc = lr_init_status()) != 0)
1663                 return rc;
1664
1665         while ((rc = getopt_long(argc, argv, "as:t:m:u:l:vx:zc:ry:n:d:D:",
1666                                  long_opts, NULL)) >= 0) {
1667                 switch (rc) {
1668                 case 'a':
1669                         /* Assume absolute paths */
1670                         abort_on_err++;
1671                         break;
1672                 case 's':
1673                         /* Assume absolute paths */
1674                         strlcpy(status->ls_source, optarg,
1675                                 sizeof(status->ls_source));
1676                         break;
1677                 case 't':
1678                         status->ls_num_targets++;
1679                         numtargets++;
1680                         if (numtargets != status->ls_num_targets) {
1681                                 /* Targets were read from a log
1682                                    file. The ones specified on the
1683                                    command line take precedence. The
1684                                    ones from the log file will be
1685                                    ignored. */
1686                                 status->ls_num_targets = numtargets;
1687                         }
1688                         newsize = sizeof (struct lustre_rsync_status) +
1689                                 (status->ls_num_targets * (PATH_MAX + 1));
1690                         if (status->ls_size != newsize) {
1691                                 status->ls_size = newsize;
1692                                 status = lr_grow_buf(status, newsize);
1693                                 if (status == NULL)
1694                                         return -ENOMEM;
1695                         }
1696                         strlcpy(status->ls_targets[status->ls_num_targets - 1],
1697                                 optarg, sizeof(status->ls_targets[0]));
1698                         break;
1699                 case 'm':
1700                         strlcpy(status->ls_mdt_device, optarg,
1701                                 sizeof(status->ls_mdt_device));
1702                         break;
1703                 case 'u':
1704                         strlcpy(status->ls_registration, optarg,
1705                                 sizeof(status->ls_registration));
1706                         break;
1707                 case 'l':
1708                         statuslog = optarg;
1709                         (void) lr_read_log();
1710                         break;
1711                 case 'v':
1712                         verbose++;
1713                         break;
1714                 case 'x':
1715                         if (strcmp("no", optarg) == 0) {
1716                                 noxattr = 1;
1717                         } else if (strcmp("yes", optarg) != 0) {
1718                                 printf("Invalid parameter %s. "
1719                                        "Specify --xattr=no or --xattr=yes\n",
1720                                        optarg);
1721                                 return -1;
1722                         }
1723                         break;
1724                 case 'z':
1725                         dryrun = 1;
1726                         break;
1727                 case 'c':
1728                         /* Undocumented option cl-clear */
1729                         if (strcmp("no", optarg) == 0) {
1730                                 noclear = 1;
1731                         } else if (strcmp("yes", optarg) != 0) {
1732                                 printf("Invalid parameter %s. "
1733                                        "Specify --cl-clear=no "
1734                                        "or --cl-clear=yes\n",
1735                                        optarg);
1736                                 return -1;
1737                         }
1738                         break;
1739                 case 'r':
1740                         /* Undocumented option use-rsync */
1741                         use_rsync = 1;
1742                         break;
1743                 case 'y':
1744                         /* Undocumented option rsync-threshold */
1745                         rsync_threshold = atol(optarg);
1746                         break;
1747                 case 'n':
1748                         /* Undocumented option start-recno */
1749                         status->ls_last_recno = atol(optarg);
1750                         break;
1751                 case 'd':
1752                         /* Undocumented option debug */
1753                         debug = atoi(optarg);
1754                         if (debug < 0 || debug > 2)
1755                                 debug = 0;
1756                         break;
1757                 case 'D':
1758                         /* Undocumented option debug log file */
1759                         if (debug_log != NULL)
1760                                 fclose(debug_log);
1761                         debug_log = fopen(optarg, "a");
1762                         if (debug_log == NULL) {
1763                                 printf("Cannot open %s for debug log\n",
1764                                        optarg);
1765                                 return -1;
1766                         }
1767                         break;
1768                 default:
1769                         fprintf(stderr, "error: %s: option '%s' "
1770                                 "unrecognized.\n", argv[0], argv[optind - 1]);
1771                         lr_usage();
1772                         return -1;
1773                 }
1774         }
1775
1776         if (status->ls_last_recno == -1)
1777                 status->ls_last_recno = 0;
1778         if (strnlen(status->ls_registration, LR_NAME_MAXLEN) == 0) {
1779                 /* No registration ID was passed in. */
1780                 printf("Please specify changelog consumer registration id.\n");
1781                 lr_usage();
1782                 return -1;
1783         }
1784         if (strnlen(status->ls_source, PATH_MAX) == 0) {
1785                 fprintf(stderr, "Please specify the source path.\n");
1786                 lr_usage();
1787                 return -1;
1788         }
1789         if (strnlen(status->ls_targets[0], PATH_MAX) == 0) {
1790                 fprintf(stderr, "Please specify the target path.\n");
1791                 lr_usage();
1792                 return -1;
1793         }
1794
1795         /* This plumbing is needed for some of the ioctls behind
1796            llapi calls to work. */
1797         if (obd_initialize(argc, argv) < 0) {
1798                 fprintf(stderr, "obd_initialize failed.\n");
1799                 exit(-1);
1800         }
1801
1802         rc = lr_locate_rsync();
1803         if (use_rsync && rc != 0) {
1804                 fprintf(stderr, "Error: unable to locate %s.\n", RSYNC);
1805                 exit(-1);
1806         }
1807
1808         signal(SIGINT, termination_handler);
1809         signal(SIGHUP, termination_handler);
1810         signal(SIGTERM, termination_handler);
1811
1812         rc = lr_replicate();
1813
1814         if (debug_log != NULL)
1815                 fclose(debug_log);
1816         return rc;
1817 }