2 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sbin/hammer/cmd_mirror.c,v 1.11 2008/07/19 18:48:14 dillon Exp $
39 #define SERIALBUF_SIZE (512 * 1024)
41 static int read_mrecords(int fd, char *buf, u_int size,
42 hammer_ioc_mrecord_head_t pickup);
43 static hammer_ioc_mrecord_any_t read_mrecord(int fdin, int *errorp,
44 hammer_ioc_mrecord_head_t pickup);
45 static void write_mrecord(int fdout, u_int32_t type,
46 hammer_ioc_mrecord_any_t mrec, int bytes);
47 static void generate_mrec_header(int fd, int fdout, int pfs_id,
48 hammer_tid_t *tid_begp, hammer_tid_t *tid_endp);
49 static void validate_mrec_header(int fd, int fdin, int is_target, int pfs_id,
50 hammer_tid_t *tid_begp, hammer_tid_t *tid_endp);
51 static void update_pfs_snapshot(int fd, hammer_tid_t snapshot_tid, int pfs_id);
52 static void mirror_usage(int code);
55 * Generate a mirroring data stream from the specific source over the
56 * entire key range, but restricted to the specified transaction range.
58 * The HAMMER VFS does most of the work, we add a few new mrecord
59 * types to negotiate the TID ranges and verify that the entire
60 * stream made it to the destination.
63 hammer_cmd_mirror_read(char **av, int ac)
65 struct hammer_ioc_mirror_rw mirror;
66 struct hammer_ioc_pseudofs_rw pfs;
67 union hammer_ioc_mrecord_any mrec_tmp;
68 hammer_ioc_mrecord_any_t mrec;
69 hammer_tid_t sync_tid;
70 const char *filesystem;
71 char *buf = malloc(SERIALBUF_SIZE);
76 time_t base_t = time(NULL);
82 bzero(&mirror, sizeof(mirror));
83 hammer_key_beg_init(&mirror.key_beg);
84 hammer_key_end_init(&mirror.key_end);
86 fd = getpfs(&pfs, filesystem);
89 * In 2-way mode the target will send us a PFS info packet
90 * first. Use the target's current snapshot TID as our default
95 validate_mrec_header(fd, 0, 0, pfs.pfs_id,
96 NULL, &mirror.tid_beg);
99 * Write out the PFS header, tid_beg will be updated if our PFS
100 * has a larger begin sync. tid_end is set to the latest source
101 * TID whos flush cycle has completed.
103 generate_mrec_header(fd, 1, pfs.pfs_id,
104 &mirror.tid_beg, &mirror.tid_end);
107 * A cycle file overrides the beginning TID
109 hammer_get_cycle(&mirror.key_beg, &mirror.tid_beg);
112 mirror.tid_beg = strtoull(av[1], NULL, 0);
114 fprintf(stderr, "Mirror-read: Mirror from %016llx to %016llx\n",
115 mirror.tid_beg, mirror.tid_end);
116 if (mirror.key_beg.obj_id != (int64_t)HAMMER_MIN_OBJID) {
117 fprintf(stderr, "Mirror-read: Resuming at object %016llx\n",
118 mirror.key_beg.obj_id);
122 * Nothing to do if begin equals end.
124 if (mirror.tid_beg == mirror.tid_end) {
125 fprintf(stderr, "Mirror-read: No work to do, stopping\n");
126 write_mrecord(1, HAMMER_MREC_TYPE_TERM,
127 &mrec_tmp, sizeof(mrec_tmp.sync));
132 * Write out bulk records
135 mirror.size = SERIALBUF_SIZE;
139 mirror.pfs_id = pfs.pfs_id;
140 mirror.shared_uuid = pfs.ondisk->shared_uuid;
141 if (ioctl(fd, HAMMERIOC_MIRROR_READ, &mirror) < 0) {
142 fprintf(stderr, "Mirror-read %s failed: %s\n",
143 filesystem, strerror(errno));
146 if (mirror.head.flags & HAMMER_IOC_HEAD_ERROR) {
148 "Mirror-read %s fatal error %d\n",
149 filesystem, mirror.head.error);
153 n = write(1, mirror.ubuf, mirror.count);
154 if (n != mirror.count) {
155 fprintf(stderr, "Mirror-read %s failed: "
161 mirror.key_beg = mirror.key_cur;
163 (unsigned)(time(NULL) - base_t) > (unsigned)TimeoutOpt) {
165 "Mirror-read %s interrupted by timer at"
168 mirror.key_cur.obj_id);
172 } while (mirror.count != 0);
175 * Write out the termination sync record
177 write_mrecord(1, HAMMER_MREC_TYPE_SYNC,
178 &mrec_tmp, sizeof(mrec_tmp.sync));
181 * If the -2 option was given (automatic when doing mirror-copy),
182 * a two-way pipe is assumed and we expect a response mrec from
186 mrec = read_mrecord(0, &error, NULL);
188 mrec->head.type != HAMMER_MREC_TYPE_UPDATE ||
189 mrec->head.rec_size != sizeof(mrec->update)) {
190 fprintf(stderr, "mirror_read: Did not get final "
191 "acknowledgement packet from target\n");
196 hammer_set_cycle(&mirror.key_cur, mirror.tid_beg);
197 fprintf(stderr, "Cyclefile %s updated for continuation\n", CyclePath);
200 sync_tid = mrec->update.tid;
202 hammer_key_beg_init(&mirror.key_beg);
203 hammer_set_cycle(&mirror.key_beg, sync_tid);
204 fprintf(stderr, "Cyclefile %s updated to 0x%016llx\n",
205 CyclePath, sync_tid);
208 } else if (CyclePath) {
209 /* NOTE! mirror.tid_beg cannot be updated */
210 fprintf(stderr, "Warning: cycle file (-c option) cannot be "
211 "fully updated unless you use mirror-copy\n");
212 hammer_set_cycle(&mirror.key_beg, mirror.tid_beg);
215 fprintf(stderr, "Mirror-read %s succeeded\n", filesystem);
219 * Pipe the mirroring data stream on stdin to the HAMMER VFS, adding
220 * some additional packet types to negotiate TID ranges and to verify
221 * completion. The HAMMER VFS does most of the work.
223 * It is important to note that the mirror.key_{beg,end} range must
224 * match the ranged used by the original. For now both sides use
225 * range the entire key space.
227 * It is even more important that the records in the stream conform
228 * to the TID range also supplied in the stream. The HAMMER VFS will
229 * use the REC, PASS, and SKIP record types to track the portions of
230 * the B-Tree being scanned in order to be able to proactively delete
231 * records on the target within those active areas that are not mentioned
234 * The mirror.key_cur field is used by the VFS to do this tracking. It
235 * must be initialized to key_beg but then is persistently updated by
236 * the HAMMER VFS on each successive ioctl() call. If you blow up this
237 * field you will blow up the mirror target, possibly to the point of
238 * deleting everything. As a safety measure the HAMMER VFS simply marks
239 * the records that the source has destroyed as deleted on the target,
240 * and normal pruning operations will deal with their final disposition
241 * at some later time.
244 hammer_cmd_mirror_write(char **av, int ac)
246 struct hammer_ioc_mirror_rw mirror;
247 const char *filesystem;
248 char *buf = malloc(SERIALBUF_SIZE);
249 struct hammer_ioc_pseudofs_rw pfs;
250 struct hammer_ioc_mrecord_head pickup;
251 struct hammer_ioc_synctid synctid;
252 union hammer_ioc_mrecord_any mrec_tmp;
253 hammer_ioc_mrecord_any_t mrec;
261 bzero(&mirror, sizeof(mirror));
262 hammer_key_beg_init(&mirror.key_beg);
263 hammer_key_end_init(&mirror.key_end);
264 mirror.key_end = mirror.key_beg;
266 fd = getpfs(&pfs, filesystem);
269 * In two-way mode the target writes out a PFS packet first.
270 * The source uses our tid_end as its tid_beg by default,
271 * picking up where it left off.
275 generate_mrec_header(fd, 1, pfs.pfs_id,
276 &mirror.tid_beg, &mirror.tid_end);
280 * Read and process the PFS header. The source informs us of
281 * the TID range the stream represents.
283 validate_mrec_header(fd, 0, 1, pfs.pfs_id,
284 &mirror.tid_beg, &mirror.tid_end);
287 mirror.size = SERIALBUF_SIZE;
289 pickup.signature = 0;
293 * Read and process bulk records (REC, PASS, and SKIP types).
295 * On your life, do NOT mess with mirror.key_cur or your mirror
296 * target may become history.
300 mirror.pfs_id = pfs.pfs_id;
301 mirror.shared_uuid = pfs.ondisk->shared_uuid;
302 mirror.size = read_mrecords(0, buf, SERIALBUF_SIZE, &pickup);
303 if (mirror.size <= 0)
305 if (ioctl(fd, HAMMERIOC_MIRROR_WRITE, &mirror) < 0) {
306 fprintf(stderr, "Mirror-write %s failed: %s\n",
307 filesystem, strerror(errno));
310 if (mirror.head.flags & HAMMER_IOC_HEAD_ERROR) {
312 "Mirror-write %s fatal error %d\n",
313 filesystem, mirror.head.error);
317 if (mirror.head.flags & HAMMER_IOC_HEAD_INTR) {
319 "Mirror-write %s interrupted by timer at"
322 mirror.key_cur.obj_id);
329 * Read and process the termination sync record.
331 mrec = read_mrecord(0, &error, &pickup);
333 if (mrec && mrec->head.type == HAMMER_MREC_TYPE_TERM) {
334 fprintf(stderr, "Mirror-write: No work to do, stopping\n");
339 mrec->head.type != HAMMER_MREC_TYPE_SYNC ||
340 mrec->head.rec_size != sizeof(mrec->sync)) {
341 fprintf(stderr, "Mirror-write %s: Did not get termination "
342 "sync record, or rec_size is wrong rt=%d\n",
343 filesystem, mrec->head.type);
350 * Update the PFS info on the target so the user has visibility
351 * into the new snapshot.
353 update_pfs_snapshot(fd, mirror.tid_end, pfs.pfs_id);
356 * Sync the target filesystem
358 bzero(&synctid, sizeof(synctid));
359 synctid.op = HAMMER_SYNCTID_SYNC2;
360 ioctl(fd, HAMMERIOC_SYNCTID, &synctid);
362 fprintf(stderr, "Mirror-write %s: succeeded\n", filesystem);
365 * Report back to the originator.
368 mrec_tmp.update.tid = mirror.tid_end;
369 write_mrecord(1, HAMMER_MREC_TYPE_UPDATE,
370 &mrec_tmp, sizeof(mrec_tmp.update));
372 printf("Source can update synctid to 0x%016llx\n",
378 hammer_cmd_mirror_dump(void)
380 char *buf = malloc(SERIALBUF_SIZE);
381 struct hammer_ioc_mrecord_head pickup;
382 hammer_ioc_mrecord_any_t mrec;
389 * Read and process the PFS header
391 pickup.signature = 0;
394 mrec = read_mrecord(0, &error, &pickup);
397 * Read and process bulk records
400 size = read_mrecords(0, buf, SERIALBUF_SIZE, &pickup);
404 while (offset < size) {
405 mrec = (void *)((char *)buf + offset);
406 bytes = HAMMER_HEAD_DOALIGN(mrec->head.rec_size);
407 if (offset + bytes > size) {
408 fprintf(stderr, "Misaligned record\n");
412 switch(mrec->head.type) {
413 case HAMMER_MREC_TYPE_REC:
414 printf("Record obj=%016llx key=%016llx "
416 mrec->rec.leaf.base.obj_id,
417 mrec->rec.leaf.base.key,
418 mrec->rec.leaf.base.rec_type,
419 mrec->rec.leaf.base.obj_type);
420 printf(" tids %016llx:%016llx data=%d\n",
421 mrec->rec.leaf.base.create_tid,
422 mrec->rec.leaf.base.delete_tid,
423 mrec->rec.leaf.data_len);
425 case HAMMER_MREC_TYPE_PASS:
426 printf("Pass obj=%016llx key=%016llx "
428 mrec->rec.leaf.base.obj_id,
429 mrec->rec.leaf.base.key,
430 mrec->rec.leaf.base.rec_type,
431 mrec->rec.leaf.base.obj_type);
432 printf(" tids %016llx:%016llx data=%d\n",
433 mrec->rec.leaf.base.create_tid,
434 mrec->rec.leaf.base.delete_tid,
435 mrec->rec.leaf.data_len);
437 case HAMMER_MREC_TYPE_SKIP:
438 printf("Skip obj=%016llx key=%016llx rt=%02x to\n"
439 " obj=%016llx key=%016llx rt=%02x\n",
440 mrec->skip.skip_beg.obj_id,
441 mrec->skip.skip_beg.key,
442 mrec->skip.skip_beg.rec_type,
443 mrec->skip.skip_end.obj_id,
444 mrec->skip.skip_end.key,
445 mrec->skip.skip_end.rec_type);
454 * Read and process the termination sync record.
456 mrec = read_mrecord(0, &error, &pickup);
457 if (mrec == NULL || mrec->head.type != HAMMER_MREC_TYPE_SYNC) {
458 fprintf(stderr, "Mirror-dump: Did not get termination "
464 hammer_cmd_mirror_copy(char **av, int ac)
487 if ((pid1 = fork()) == 0) {
492 if ((ptr = strchr(av[0], ':')) != NULL) {
497 xav[xac++] = "hammer";
502 snprintf(tbuf, sizeof(tbuf), "%d", TimeoutOpt);
506 xav[xac++] = "mirror-read";
509 execv("/usr/bin/ssh", (void *)xav);
511 hammer_cmd_mirror_read(av, 1);
521 if ((pid2 = fork()) == 0) {
526 if ((ptr = strchr(av[1], ':')) != NULL) {
531 xav[xac++] = "hammer";
535 xav[xac++] = "mirror-write";
538 execv("/usr/bin/ssh", (void *)xav);
540 hammer_cmd_mirror_write(av + 1, 1);
549 while (waitpid(pid1, NULL, 0) <= 0)
551 while (waitpid(pid2, NULL, 0) <= 0)
556 * Read and return multiple mrecords
559 read_mrecords(int fd, char *buf, u_int size, hammer_ioc_mrecord_head_t pickup)
561 hammer_ioc_mrecord_any_t mrec;
568 while (size - count >= HAMMER_MREC_HEADSIZE) {
570 * Cached the record header in case we run out of buffer
574 if (pickup->signature == 0) {
575 for (n = 0; n < HAMMER_MREC_HEADSIZE; n += i) {
576 i = read(fd, (char *)pickup + n,
577 HAMMER_MREC_HEADSIZE - n);
583 if (n != HAMMER_MREC_HEADSIZE) {
584 fprintf(stderr, "read_mrecords: short read on pipe\n");
588 if (pickup->signature != HAMMER_IOC_MIRROR_SIGNATURE) {
589 fprintf(stderr, "read_mrecords: malformed record on pipe, bad signature\n");
593 if (pickup->rec_size < HAMMER_MREC_HEADSIZE ||
594 pickup->rec_size > sizeof(*mrec) + HAMMER_XBUFSIZE) {
595 fprintf(stderr, "read_mrecords: malformed record on pipe, illegal rec_size\n");
600 * Stop if we have insufficient space for the record and data.
602 bytes = HAMMER_HEAD_DOALIGN(pickup->rec_size);
603 if (size - count < bytes)
607 * Stop if the record type is not a REC or a SKIP (the only
608 * two types the ioctl supports. Other types are used only
609 * by the userland protocol).
611 if (pickup->type != HAMMER_MREC_TYPE_REC &&
612 pickup->type != HAMMER_MREC_TYPE_SKIP &&
613 pickup->type != HAMMER_MREC_TYPE_PASS) {
618 * Read the remainder and clear the pickup signature.
620 for (n = HAMMER_MREC_HEADSIZE; n < bytes; n += i) {
621 i = read(fd, buf + count + n, bytes - n);
626 fprintf(stderr, "read_mrecords: short read on pipe\n");
630 bcopy(pickup, buf + count, HAMMER_MREC_HEADSIZE);
631 pickup->signature = 0;
633 mrec = (void *)(buf + count);
636 * Validate the completed record
638 if (mrec->head.rec_crc !=
639 crc32((char *)mrec + HAMMER_MREC_CRCOFF,
640 mrec->head.rec_size - HAMMER_MREC_CRCOFF)) {
641 fprintf(stderr, "read_mrecords: malformed record "
642 "on pipe, bad crc\n");
647 * If its a B-Tree record validate the data crc
649 if (mrec->head.type == HAMMER_MREC_TYPE_REC) {
650 if (mrec->head.rec_size <
651 sizeof(mrec->rec) + mrec->rec.leaf.data_len) {
653 "read_mrecords: malformed record on "
654 "pipe, illegal element data_len\n");
657 if (mrec->rec.leaf.data_len &&
658 mrec->rec.leaf.data_offset &&
659 hammer_crc_test_leaf(&mrec->rec + 1, &mrec->rec.leaf) == 0) {
661 "read_mrecords: data_crc did not "
662 "match data! obj=%016llx key=%016llx\n",
663 mrec->rec.leaf.base.obj_id,
664 mrec->rec.leaf.base.key);
666 "continuing, but there are problems\n");
675 * Read and return a single mrecord.
678 hammer_ioc_mrecord_any_t
679 read_mrecord(int fdin, int *errorp, hammer_ioc_mrecord_head_t pickup)
681 hammer_ioc_mrecord_any_t mrec;
682 struct hammer_ioc_mrecord_head mrechd;
687 if (pickup && pickup->type != 0) {
689 pickup->signature = 0;
691 n = HAMMER_MREC_HEADSIZE;
694 * Read in the PFSD header from the sender.
696 for (n = 0; n < HAMMER_MREC_HEADSIZE; n += i) {
697 i = read(fdin, (char *)&mrechd + n, HAMMER_MREC_HEADSIZE - n);
702 *errorp = 0; /* EOF */
705 if (n != HAMMER_MREC_HEADSIZE) {
706 fprintf(stderr, "short read of mrecord header\n");
711 if (mrechd.signature != HAMMER_IOC_MIRROR_SIGNATURE) {
712 fprintf(stderr, "read_mrecord: bad signature\n");
716 bytes = HAMMER_HEAD_DOALIGN(mrechd.rec_size);
717 assert(bytes >= sizeof(mrechd));
718 mrec = malloc(bytes);
722 i = read(fdin, (char *)mrec + n, bytes - n);
728 fprintf(stderr, "read_mrecord: short read on payload\n");
732 if (mrec->head.rec_crc !=
733 crc32((char *)mrec + HAMMER_MREC_CRCOFF,
734 mrec->head.rec_size - HAMMER_MREC_CRCOFF)) {
735 fprintf(stderr, "read_mrecord: bad CRC\n");
745 write_mrecord(int fdout, u_int32_t type, hammer_ioc_mrecord_any_t mrec,
748 char zbuf[HAMMER_HEAD_ALIGN];
751 pad = HAMMER_HEAD_DOALIGN(bytes) - bytes;
753 assert(bytes >= (int)sizeof(mrec->head));
754 bzero(&mrec->head, sizeof(mrec->head));
755 mrec->head.signature = HAMMER_IOC_MIRROR_SIGNATURE;
756 mrec->head.type = type;
757 mrec->head.rec_size = bytes;
758 mrec->head.rec_crc = crc32((char *)mrec + HAMMER_MREC_CRCOFF,
759 bytes - HAMMER_MREC_CRCOFF);
760 if (write(fdout, mrec, bytes) != bytes) {
761 fprintf(stderr, "write_mrecord: error %d (%s)\n",
762 errno, strerror(errno));
767 if (write(fdout, zbuf, pad) != pad) {
768 fprintf(stderr, "write_mrecord: error %d (%s)\n",
769 errno, strerror(errno));
776 * Generate a mirroring header with the pfs information of the
777 * originating filesytem.
780 generate_mrec_header(int fd, int fdout, int pfs_id,
781 hammer_tid_t *tid_begp, hammer_tid_t *tid_endp)
783 struct hammer_ioc_pseudofs_rw pfs;
784 union hammer_ioc_mrecord_any mrec_tmp;
786 bzero(&pfs, sizeof(pfs));
787 bzero(&mrec_tmp, sizeof(mrec_tmp));
789 pfs.ondisk = &mrec_tmp.pfs.pfsd;
790 pfs.bytes = sizeof(mrec_tmp.pfs.pfsd);
791 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0) {
792 fprintf(stderr, "Mirror-read: not a HAMMER fs/pseudofs!\n");
795 if (pfs.version != HAMMER_IOC_PSEUDOFS_VERSION) {
796 fprintf(stderr, "Mirror-read: HAMMER pfs version mismatch!\n");
801 * sync_beg_tid - lowest TID on source after which a full history
804 * sync_end_tid - highest fully synchronized TID from source.
806 if (tid_begp && *tid_begp < mrec_tmp.pfs.pfsd.sync_beg_tid)
807 *tid_begp = mrec_tmp.pfs.pfsd.sync_beg_tid;
809 *tid_endp = mrec_tmp.pfs.pfsd.sync_end_tid;
810 mrec_tmp.pfs.version = pfs.version;
811 write_mrecord(fdout, HAMMER_MREC_TYPE_PFSD,
812 &mrec_tmp, sizeof(mrec_tmp.pfs));
816 * Validate the pfs information from the originating filesystem
817 * against the target filesystem. shared_uuid must match.
820 validate_mrec_header(int fd, int fdin, int is_target, int pfs_id,
821 hammer_tid_t *tid_begp, hammer_tid_t *tid_endp)
823 struct hammer_ioc_pseudofs_rw pfs;
824 struct hammer_pseudofs_data pfsd;
825 hammer_ioc_mrecord_any_t mrec;
829 * Get the PFSD info from the target filesystem.
831 bzero(&pfs, sizeof(pfs));
832 bzero(&pfsd, sizeof(pfsd));
835 pfs.bytes = sizeof(pfsd);
836 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0) {
837 fprintf(stderr, "mirror-write: not a HAMMER fs/pseudofs!\n");
840 if (pfs.version != HAMMER_IOC_PSEUDOFS_VERSION) {
841 fprintf(stderr, "mirror-write: HAMMER pfs version mismatch!\n");
845 mrec = read_mrecord(fdin, &error, NULL);
848 fprintf(stderr, "validate_mrec_header: short read\n");
851 if (mrec->head.type != HAMMER_MREC_TYPE_PFSD) {
852 fprintf(stderr, "validate_mrec_header: did not get expected "
853 "PFSD record type\n");
856 if (mrec->head.rec_size != sizeof(mrec->pfs)) {
857 fprintf(stderr, "validate_mrec_header: unexpected payload "
861 if (mrec->pfs.version != pfs.version) {
862 fprintf(stderr, "validate_mrec_header: Version mismatch\n");
867 * Whew. Ok, is the read PFS info compatible with the target?
869 if (bcmp(&mrec->pfs.pfsd.shared_uuid, &pfsd.shared_uuid,
870 sizeof(pfsd.shared_uuid)) != 0) {
872 "mirror-write: source and target have "
873 "different shared-uuid's!\n");
877 (pfsd.mirror_flags & HAMMER_PFSD_SLAVE) == 0) {
878 fprintf(stderr, "mirror-write: target must be in slave mode\n");
882 *tid_begp = mrec->pfs.pfsd.sync_beg_tid;
884 *tid_endp = mrec->pfs.pfsd.sync_end_tid;
889 update_pfs_snapshot(int fd, hammer_tid_t snapshot_tid, int pfs_id)
891 struct hammer_ioc_pseudofs_rw pfs;
892 struct hammer_pseudofs_data pfsd;
894 bzero(&pfs, sizeof(pfs));
895 bzero(&pfsd, sizeof(pfsd));
898 pfs.bytes = sizeof(pfsd);
899 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0) {
900 perror("update_pfs_snapshot (read)");
903 if (pfsd.sync_end_tid != snapshot_tid) {
904 pfsd.sync_end_tid = snapshot_tid;
905 if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) != 0) {
906 perror("update_pfs_snapshot (rewrite)");
910 "Mirror-write: Completed, updated snapshot "
918 mirror_usage(int code)
921 "hammer mirror-read <filesystem>\n"
922 "hammer mirror-write <filesystem>\n"
923 "hammer mirror-dump\n"
924 "hammer mirror-copy [[user@]host:]fs [[user@]host:]fs\n"