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 1.7 2008/07/10 04:44:58 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 * Write out bulk records
125 mirror.size = SERIALBUF_SIZE;
129 mirror.pfs_id = pfs.pfs_id;
130 mirror.shared_uuid = pfs.ondisk->shared_uuid;
131 if (ioctl(fd, HAMMERIOC_MIRROR_READ, &mirror) < 0) {
132 fprintf(stderr, "Mirror-read %s failed: %s\n",
133 filesystem, strerror(errno));
137 n = write(1, mirror.ubuf, mirror.count);
138 if (n != mirror.count) {
139 fprintf(stderr, "Mirror-read %s failed: "
145 mirror.key_beg = mirror.key_cur;
147 (unsigned)(time(NULL) - base_t) > (unsigned)TimeoutOpt) {
149 "Mirror-read %s interrupted by timer at"
152 mirror.key_cur.obj_id);
156 } while (mirror.count != 0);
159 * Write out the termination sync record
161 write_mrecord(1, HAMMER_MREC_TYPE_SYNC,
162 &mrec_tmp, sizeof(mrec_tmp.sync));
165 * If the -2 option was given (automatic when doing mirror-copy),
166 * a two-way pipe is assumed and we expect a response mrec from
170 mrec = read_mrecord(0, &error, NULL);
172 mrec->head.type != HAMMER_MREC_TYPE_UPDATE ||
173 mrec->head.rec_size != sizeof(mrec->update)) {
174 fprintf(stderr, "mirror_read: Did not get final "
175 "acknowledgement packet from target\n");
180 hammer_set_cycle(&mirror.key_cur, mirror.tid_beg);
181 fprintf(stderr, "Cyclefile %s updated for continuation\n", CyclePath);
184 sync_tid = mrec->update.tid;
186 hammer_key_beg_init(&mirror.key_beg);
187 hammer_set_cycle(&mirror.key_beg, sync_tid);
188 fprintf(stderr, "Cyclefile %s updated to 0x%016llx\n",
189 CyclePath, sync_tid);
191 fprintf(stderr, "Source can update synctid "
196 } else if (CyclePath) {
197 /* NOTE! mirror.tid_beg cannot be updated */
198 fprintf(stderr, "Warning: cycle file (-c option) cannot be "
199 "fully updated unless you use mirror-copy\n");
200 hammer_set_cycle(&mirror.key_beg, mirror.tid_beg);
202 fprintf(stderr, "Mirror-read %s succeeded\n", filesystem);
206 * Pipe the mirroring data stream on stdin to the HAMMER VFS, adding
207 * some additional packet types to negotiate TID ranges and to verify
208 * completion. The HAMMER VFS does most of the work.
210 * It is important to note that the mirror.key_{beg,end} range must
211 * match the ranged used by the original. For now both sides use
212 * range the entire key space.
214 * It is even more important that the records in the stream conform
215 * to the TID range also supplied in the stream. The HAMMER VFS will
216 * use the REC, PASS, and SKIP record types to track the portions of
217 * the B-Tree being scanned in order to be able to proactively delete
218 * records on the target within those active areas that are not mentioned
221 * The mirror.key_cur field is used by the VFS to do this tracking. It
222 * must be initialized to key_beg but then is persistently updated by
223 * the HAMMER VFS on each successive ioctl() call. If you blow up this
224 * field you will blow up the mirror target, possibly to the point of
225 * deleting everything. As a safety measure the HAMMER VFS simply marks
226 * the records that the source has destroyed as deleted on the target,
227 * and normal pruning operations will deal with their final disposition
228 * at some later time.
231 hammer_cmd_mirror_write(char **av, int ac)
233 struct hammer_ioc_mirror_rw mirror;
234 const char *filesystem;
235 char *buf = malloc(SERIALBUF_SIZE);
236 struct hammer_ioc_pseudofs_rw pfs;
237 struct hammer_ioc_mrecord_head pickup;
238 struct hammer_ioc_synctid synctid;
239 union hammer_ioc_mrecord_any mrec_tmp;
240 hammer_ioc_mrecord_any_t mrec;
248 bzero(&mirror, sizeof(mirror));
249 hammer_key_beg_init(&mirror.key_beg);
250 hammer_key_end_init(&mirror.key_end);
251 mirror.key_end = mirror.key_beg;
253 fd = getpfs(&pfs, filesystem);
256 * In two-way mode the target writes out a PFS packet first.
257 * The source uses our tid_end as its tid_beg by default,
258 * picking up where it left off.
262 generate_mrec_header(fd, 1, pfs.pfs_id,
263 &mirror.tid_beg, &mirror.tid_end);
267 * Read and process the PFS header. The source informs us of
268 * the TID range the stream represents.
270 validate_mrec_header(fd, 0, 1, pfs.pfs_id,
271 &mirror.tid_beg, &mirror.tid_end);
274 mirror.size = SERIALBUF_SIZE;
276 pickup.signature = 0;
280 * Read and process bulk records (REC, PASS, and SKIP types).
282 * On your life, do NOT mess with mirror.key_cur or your mirror
283 * target may become history.
287 mirror.pfs_id = pfs.pfs_id;
288 mirror.shared_uuid = pfs.ondisk->shared_uuid;
289 mirror.size = read_mrecords(0, buf, SERIALBUF_SIZE, &pickup);
290 if (mirror.size <= 0)
292 if (ioctl(fd, HAMMERIOC_MIRROR_WRITE, &mirror) < 0) {
293 fprintf(stderr, "Mirror-write %s failed: %s\n",
294 filesystem, strerror(errno));
297 if (mirror.head.flags & HAMMER_IOC_HEAD_ERROR) {
299 "Mirror-write %s fatal error %d\n",
300 filesystem, mirror.head.error);
304 if (mirror.head.flags & HAMMER_IOC_HEAD_INTR) {
306 "Mirror-write %s interrupted by timer at"
309 mirror.key_cur.obj_id);
316 * Read and process the termination sync record.
318 mrec = read_mrecord(0, &error, &pickup);
320 mrec->head.type != HAMMER_MREC_TYPE_SYNC ||
321 mrec->head.rec_size != sizeof(mrec->sync)) {
322 fprintf(stderr, "Mirror-write %s: Did not get termination "
323 "sync record, or rec_size is wrong rt=%d\n",
324 filesystem, mrec->head.type);
330 * Update the PFS info on the target so the user has visibility
331 * into the new snapshot.
333 update_pfs_snapshot(fd, mirror.tid_end, pfs.pfs_id);
336 * Sync the target filesystem
338 bzero(&synctid, sizeof(synctid));
339 synctid.op = HAMMER_SYNCTID_SYNC2;
340 ioctl(fd, HAMMERIOC_SYNCTID, &synctid);
342 fprintf(stderr, "Mirror-write %s: succeeded\n", filesystem);
345 * Report back to the originator.
348 mrec_tmp.update.tid = mirror.tid_end;
349 write_mrecord(1, HAMMER_MREC_TYPE_UPDATE,
350 &mrec_tmp, sizeof(mrec_tmp.update));
352 printf("Source can update synctid to 0x%016llx\n",
358 hammer_cmd_mirror_dump(void)
360 char *buf = malloc(SERIALBUF_SIZE);
361 struct hammer_ioc_mrecord_head pickup;
362 hammer_ioc_mrecord_any_t mrec;
369 * Read and process the PFS header
371 pickup.signature = 0;
374 mrec = read_mrecord(0, &error, &pickup);
377 * Read and process bulk records
380 size = read_mrecords(0, buf, SERIALBUF_SIZE, &pickup);
384 while (offset < size) {
385 mrec = (void *)((char *)buf + offset);
386 bytes = HAMMER_HEAD_DOALIGN(mrec->head.rec_size);
387 if (offset + bytes > size) {
388 fprintf(stderr, "Misaligned record\n");
392 switch(mrec->head.type) {
393 case HAMMER_MREC_TYPE_REC:
394 printf("Record obj=%016llx key=%016llx "
396 mrec->rec.leaf.base.obj_id,
397 mrec->rec.leaf.base.key,
398 mrec->rec.leaf.base.rec_type,
399 mrec->rec.leaf.base.obj_type);
400 printf(" tids %016llx:%016llx data=%d\n",
401 mrec->rec.leaf.base.create_tid,
402 mrec->rec.leaf.base.delete_tid,
403 mrec->rec.leaf.data_len);
405 case HAMMER_MREC_TYPE_PASS:
406 printf("Pass obj=%016llx key=%016llx "
408 mrec->rec.leaf.base.obj_id,
409 mrec->rec.leaf.base.key,
410 mrec->rec.leaf.base.rec_type,
411 mrec->rec.leaf.base.obj_type);
412 printf(" tids %016llx:%016llx data=%d\n",
413 mrec->rec.leaf.base.create_tid,
414 mrec->rec.leaf.base.delete_tid,
415 mrec->rec.leaf.data_len);
417 case HAMMER_MREC_TYPE_SKIP:
418 printf("Skip obj=%016llx key=%016llx rt=%02x to\n"
419 " obj=%016llx key=%016llx rt=%02x\n",
420 mrec->skip.skip_beg.obj_id,
421 mrec->skip.skip_beg.key,
422 mrec->skip.skip_beg.rec_type,
423 mrec->skip.skip_end.obj_id,
424 mrec->skip.skip_end.key,
425 mrec->skip.skip_end.rec_type);
434 * Read and process the termination sync record.
436 mrec = read_mrecord(0, &error, &pickup);
437 if (mrec == NULL || mrec->head.type != HAMMER_MREC_TYPE_SYNC) {
438 fprintf(stderr, "Mirror-dump: Did not get termination "
444 hammer_cmd_mirror_copy(char **av, int ac)
467 if ((pid1 = fork()) == 0) {
472 if ((ptr = strchr(av[0], ':')) != NULL) {
477 xav[xac++] = "hammer";
482 snprintf(tbuf, sizeof(tbuf), "%d", TimeoutOpt);
486 xav[xac++] = "mirror-read";
489 execv("/usr/bin/ssh", (void *)xav);
491 hammer_cmd_mirror_read(av, 1);
501 if ((pid2 = fork()) == 0) {
506 if ((ptr = strchr(av[1], ':')) != NULL) {
511 xav[xac++] = "hammer";
515 xav[xac++] = "mirror-write";
518 execv("/usr/bin/ssh", (void *)xav);
520 hammer_cmd_mirror_write(av + 1, 1);
529 while (waitpid(pid1, NULL, 0) <= 0)
531 while (waitpid(pid2, NULL, 0) <= 0)
536 * Read and return multiple mrecords
539 read_mrecords(int fd, char *buf, u_int size, hammer_ioc_mrecord_head_t pickup)
541 hammer_ioc_mrecord_any_t mrec;
548 while (size - count >= HAMMER_MREC_HEADSIZE) {
550 * Cached the record header in case we run out of buffer
554 if (pickup->signature == 0) {
555 for (n = 0; n < HAMMER_MREC_HEADSIZE; n += i) {
556 i = read(fd, (char *)pickup + n,
557 HAMMER_MREC_HEADSIZE - n);
563 if (n != HAMMER_MREC_HEADSIZE) {
564 fprintf(stderr, "read_mrecords: short read on pipe\n");
568 if (pickup->signature != HAMMER_IOC_MIRROR_SIGNATURE) {
569 fprintf(stderr, "read_mrecords: malformed record on pipe, bad signature\n");
573 if (pickup->rec_size < HAMMER_MREC_HEADSIZE ||
574 pickup->rec_size > sizeof(*mrec) + HAMMER_XBUFSIZE) {
575 fprintf(stderr, "read_mrecords: malformed record on pipe, illegal rec_size\n");
580 * Stop if we have insufficient space for the record and data.
582 bytes = HAMMER_HEAD_DOALIGN(pickup->rec_size);
583 if (size - count < bytes)
587 * Stop if the record type is not a REC or a SKIP (the only
588 * two types the ioctl supports. Other types are used only
589 * by the userland protocol).
591 if (pickup->type != HAMMER_MREC_TYPE_REC &&
592 pickup->type != HAMMER_MREC_TYPE_SKIP &&
593 pickup->type != HAMMER_MREC_TYPE_PASS) {
598 * Read the remainder and clear the pickup signature.
600 for (n = HAMMER_MREC_HEADSIZE; n < bytes; n += i) {
601 i = read(fd, buf + count + n, bytes - n);
606 fprintf(stderr, "read_mrecords: short read on pipe\n");
610 bcopy(pickup, buf + count, HAMMER_MREC_HEADSIZE);
611 pickup->signature = 0;
613 mrec = (void *)(buf + count);
616 * Validate the completed record
618 if (mrec->head.rec_crc !=
619 crc32((char *)mrec + HAMMER_MREC_CRCOFF,
620 mrec->head.rec_size - HAMMER_MREC_CRCOFF)) {
621 fprintf(stderr, "read_mrecords: malformed record "
622 "on pipe, bad crc\n");
627 * If its a B-Tree record validate the data crc
629 if (mrec->head.type == HAMMER_MREC_TYPE_REC) {
630 if (mrec->head.rec_size <
631 sizeof(mrec->rec) + mrec->rec.leaf.data_len) {
633 "read_mrecords: malformed record on "
634 "pipe, illegal element data_len\n");
637 if (mrec->rec.leaf.data_len &&
638 mrec->rec.leaf.data_offset &&
639 hammer_crc_test_leaf(&mrec->rec + 1, &mrec->rec.leaf) == 0) {
641 "read_mrecords: data_crc did not "
642 "match data! obj=%016llx key=%016llx\n",
643 mrec->rec.leaf.base.obj_id,
644 mrec->rec.leaf.base.key);
646 "continuing, but there are problems\n");
655 * Read and return a single mrecord.
658 hammer_ioc_mrecord_any_t
659 read_mrecord(int fdin, int *errorp, hammer_ioc_mrecord_head_t pickup)
661 hammer_ioc_mrecord_any_t mrec;
662 struct hammer_ioc_mrecord_head mrechd;
667 if (pickup && pickup->type != 0) {
669 pickup->signature = 0;
671 n = HAMMER_MREC_HEADSIZE;
674 * Read in the PFSD header from the sender.
676 for (n = 0; n < HAMMER_MREC_HEADSIZE; n += i) {
677 i = read(fdin, (char *)&mrechd + n, HAMMER_MREC_HEADSIZE - n);
682 *errorp = 0; /* EOF */
685 if (n != HAMMER_MREC_HEADSIZE) {
686 fprintf(stderr, "short read of mrecord header\n");
691 if (mrechd.signature != HAMMER_IOC_MIRROR_SIGNATURE) {
692 fprintf(stderr, "read_mrecord: bad signature\n");
696 bytes = HAMMER_HEAD_DOALIGN(mrechd.rec_size);
697 assert(bytes >= sizeof(mrechd));
698 mrec = malloc(bytes);
702 i = read(fdin, (char *)mrec + n, bytes - n);
708 fprintf(stderr, "read_mrecord: short read on payload\n");
712 if (mrec->head.rec_crc !=
713 crc32((char *)mrec + HAMMER_MREC_CRCOFF,
714 mrec->head.rec_size - HAMMER_MREC_CRCOFF)) {
715 fprintf(stderr, "read_mrecord: bad CRC\n");
725 write_mrecord(int fdout, u_int32_t type, hammer_ioc_mrecord_any_t mrec,
728 char zbuf[HAMMER_HEAD_ALIGN];
731 pad = HAMMER_HEAD_DOALIGN(bytes) - bytes;
733 assert(bytes >= (int)sizeof(mrec->head));
734 bzero(&mrec->head, sizeof(mrec->head));
735 mrec->head.signature = HAMMER_IOC_MIRROR_SIGNATURE;
736 mrec->head.type = type;
737 mrec->head.rec_size = bytes;
738 mrec->head.rec_crc = crc32((char *)mrec + HAMMER_MREC_CRCOFF,
739 bytes - HAMMER_MREC_CRCOFF);
740 if (write(fdout, mrec, bytes) != bytes) {
741 fprintf(stderr, "write_mrecord: error %d (%s)\n",
742 errno, strerror(errno));
747 if (write(fdout, zbuf, pad) != pad) {
748 fprintf(stderr, "write_mrecord: error %d (%s)\n",
749 errno, strerror(errno));
756 * Generate a mirroring header with the pfs information of the
757 * originating filesytem.
760 generate_mrec_header(int fd, int fdout, int pfs_id,
761 hammer_tid_t *tid_begp, hammer_tid_t *tid_endp)
763 struct hammer_ioc_pseudofs_rw pfs;
764 union hammer_ioc_mrecord_any mrec_tmp;
766 bzero(&pfs, sizeof(pfs));
767 bzero(&mrec_tmp, sizeof(mrec_tmp));
769 pfs.ondisk = &mrec_tmp.pfs.pfsd;
770 pfs.bytes = sizeof(mrec_tmp.pfs.pfsd);
771 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0) {
772 fprintf(stderr, "mirror-read: not a HAMMER fs/pseudofs!\n");
775 if (pfs.version != HAMMER_IOC_PSEUDOFS_VERSION) {
776 fprintf(stderr, "mirror-read: HAMMER pfs version mismatch!\n");
781 * sync_beg_tid - lowest TID on source after which a full history
784 * sync_end_tid - highest fully synchronized TID from source.
786 if (tid_begp && *tid_begp < mrec_tmp.pfs.pfsd.sync_beg_tid)
787 *tid_begp = mrec_tmp.pfs.pfsd.sync_beg_tid;
789 *tid_endp = mrec_tmp.pfs.pfsd.sync_end_tid;
790 mrec_tmp.pfs.version = pfs.version;
791 write_mrecord(fdout, HAMMER_MREC_TYPE_PFSD,
792 &mrec_tmp, sizeof(mrec_tmp.pfs));
796 * Validate the pfs information from the originating filesystem
797 * against the target filesystem. shared_uuid must match.
800 validate_mrec_header(int fd, int fdin, int is_target, int pfs_id,
801 hammer_tid_t *tid_begp, hammer_tid_t *tid_endp)
803 struct hammer_ioc_pseudofs_rw pfs;
804 struct hammer_pseudofs_data pfsd;
805 hammer_ioc_mrecord_any_t mrec;
809 * Get the PFSD info from the target filesystem.
811 bzero(&pfs, sizeof(pfs));
812 bzero(&pfsd, sizeof(pfsd));
815 pfs.bytes = sizeof(pfsd);
816 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0) {
817 fprintf(stderr, "mirror-write: not a HAMMER fs/pseudofs!\n");
820 if (pfs.version != HAMMER_IOC_PSEUDOFS_VERSION) {
821 fprintf(stderr, "mirror-write: HAMMER pfs version mismatch!\n");
825 mrec = read_mrecord(fdin, &error, NULL);
828 fprintf(stderr, "validate_mrec_header: short read\n");
831 if (mrec->head.type != HAMMER_MREC_TYPE_PFSD) {
832 fprintf(stderr, "validate_mrec_header: did not get expected "
833 "PFSD record type\n");
836 if (mrec->head.rec_size != sizeof(mrec->pfs)) {
837 fprintf(stderr, "validate_mrec_header: unexpected payload "
841 if (mrec->pfs.version != pfs.version) {
842 fprintf(stderr, "validate_mrec_header: Version mismatch\n");
847 * Whew. Ok, is the read PFS info compatible with the target?
849 if (bcmp(&mrec->pfs.pfsd.shared_uuid, &pfsd.shared_uuid,
850 sizeof(pfsd.shared_uuid)) != 0) {
852 "mirror-write: source and target have "
853 "different shared_uuid's!\n");
857 (pfsd.mirror_flags & HAMMER_PFSD_SLAVE) == 0) {
858 fprintf(stderr, "mirror-write: target must be in slave mode\n");
862 *tid_begp = mrec->pfs.pfsd.sync_beg_tid;
864 *tid_endp = mrec->pfs.pfsd.sync_end_tid;
869 update_pfs_snapshot(int fd, hammer_tid_t snapshot_tid, int pfs_id)
871 struct hammer_ioc_pseudofs_rw pfs;
872 struct hammer_pseudofs_data pfsd;
874 bzero(&pfs, sizeof(pfs));
875 bzero(&pfsd, sizeof(pfsd));
878 pfs.bytes = sizeof(pfsd);
879 if (ioctl(fd, HAMMERIOC_GET_PSEUDOFS, &pfs) != 0) {
880 perror("update_pfs_snapshot (read)");
883 pfsd.sync_end_tid = snapshot_tid;
884 if (ioctl(fd, HAMMERIOC_SET_PSEUDOFS, &pfs) != 0) {
885 perror("update_pfs_snapshot (rewrite)");
892 mirror_usage(int code)
895 "hammer mirror-read <filesystem>\n"
896 "hammer mirror-write <filesystem>\n"
897 "hammer mirror-dump\n"
898 "hammer mirror-copy [[user@]host:]fs [[user@]host:]fs\n"