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
41 #define SERIALBUF_SIZE (512 * 1024)
43 typedef struct histogram
{
48 const char *ScoreBoardFile
;
49 const char *RestrictTarget
;
51 static int read_mrecords(int fd
, char *buf
, u_int size
,
52 struct hammer_ioc_mrecord_head
*pickup
);
53 static int generate_histogram(int fd
, const char *filesystem
,
54 histogram_t
*histogram_ary
,
55 struct hammer_ioc_mirror_rw
*mirror_base
,
57 static hammer_ioc_mrecord_any_t
read_mrecord(int fdin
, int *errorp
,
58 struct hammer_ioc_mrecord_head
*pickup
);
59 static void write_mrecord(int fdout
, uint32_t type
,
60 hammer_ioc_mrecord_any_t mrec
, int bytes
);
61 static void generate_mrec_header(int fd
, int pfs_id
,
62 union hammer_ioc_mrecord_any
*mrec_tmp
);
63 static int validate_mrec_header(int fd
, int fdin
, int is_target
, int pfs_id
,
64 struct hammer_ioc_mrecord_head
*pickup
,
65 hammer_tid_t
*tid_begp
, hammer_tid_t
*tid_endp
);
66 static void update_pfs_snapshot(int fd
, hammer_tid_t snapshot_tid
, int pfs_id
);
67 static ssize_t
writebw(int fd
, const void *buf
, size_t nbytes
,
68 uint64_t *bwcount
, struct timeval
*tv1
);
69 static int getyntty(void);
70 static void score_printf(size_t i
, size_t w
, const char *ctl
, ...);
71 static void hammer_check_restrict(const char *filesystem
);
72 static void mirror_usage(int code
);
75 * Generate a mirroring data stream from the specific source over the
76 * entire key range, but restricted to the specified transaction range.
78 * The HAMMER VFS does most of the work, we add a few new mrecord
79 * types to negotiate the TID ranges and verify that the entire
80 * stream made it to the destination.
82 * streaming will be 0 for mirror-read, 1 for mirror-stream. The code will
83 * set up a fake value of -1 when running the histogram for mirror-read.
86 hammer_cmd_mirror_read(char **av
, int ac
, int streaming
)
88 struct hammer_ioc_mirror_rw mirror
;
89 struct hammer_ioc_pseudofs_rw pfs
;
90 union hammer_ioc_mrecord_any mrec_tmp
;
91 struct hammer_ioc_mrecord_head pickup
;
92 hammer_ioc_mrecord_any_t mrec
;
93 hammer_tid_t sync_tid
;
94 histogram_t histogram_ary
;
95 const char *filesystem
;
96 char *buf
= malloc(SERIALBUF_SIZE
);
108 time_t base_t
= time(NULL
);
113 if (ac
== 0 || ac
> 2) {
118 hammer_check_restrict(filesystem
);
120 pickup
.signature
= 0;
125 histogram_ary
= NULL
;
129 bzero(&mirror
, sizeof(mirror
));
130 hammer_key_beg_init(&mirror
.key_beg
);
131 hammer_key_end_init(&mirror
.key_end
);
133 fd
= getpfs(&pfs
, filesystem
);
136 score_printf(LINE1
, "Running");
138 if (streaming
>= 0 && VerboseOpt
&& VerboseOpt
< 2) {
139 fprintf(stderr
, "%cRunning \b\b", (sameline
? '\r' : '\n'));
145 gettimeofday(&bwtv
, NULL
);
149 * Send initial header for the purpose of determining the
152 generate_mrec_header(fd
, pfs
.pfs_id
, &mrec_tmp
);
153 write_mrecord(1, HAMMER_MREC_TYPE_PFSD
,
154 &mrec_tmp
, sizeof(mrec_tmp
.pfs
));
157 * In 2-way mode the target will send us a PFS info packet
158 * first. Use the target's current snapshot TID as our default
163 n
= validate_mrec_header(fd
, 0, 0, pfs
.pfs_id
, &pickup
,
164 NULL
, &mirror
.tid_beg
);
165 if (n
< 0) { /* got TERM record */
172 } else if (streaming
&& histogram
) {
173 mirror
.tid_beg
= histogram_ary
[histindex
].tid
+ 1;
179 * Write out the PFS header, tid_beg will be updated if our PFS
180 * has a larger begin sync. tid_end is set to the latest source
181 * TID whos flush cycle has completed.
183 generate_mrec_header(fd
, pfs
.pfs_id
, &mrec_tmp
);
184 if (mirror
.tid_beg
< mrec_tmp
.pfs
.pfsd
.sync_beg_tid
)
185 mirror
.tid_beg
= mrec_tmp
.pfs
.pfsd
.sync_beg_tid
;
186 mirror
.tid_end
= mrec_tmp
.pfs
.pfsd
.sync_end_tid
;
188 mirror
.size
= SERIALBUF_SIZE
;
189 mirror
.pfs_id
= pfs
.pfs_id
;
190 mirror
.shared_uuid
= pfs
.ondisk
->shared_uuid
;
193 * XXX If the histogram is exhausted and the TID delta is large
194 * the stream might have been offline for a while and is
195 * now picking it up again. Do another histogram.
198 if (streaming
&& histogram
&& histindex
== histend
) {
199 if (mirror
.tid_end
- mirror
.tid_beg
> BULK_MINIMUM
)
205 * Initial bulk startup control, try to do some incremental
206 * mirroring in order to allow the stream to be killed and
207 * restarted without having to start over.
209 if (histogram
== 0 && BulkOpt
== 0) {
210 if (VerboseOpt
&& repeat
== 0) {
211 fprintf(stderr
, "\n");
214 histmax
= generate_histogram(fd
, filesystem
,
215 &histogram_ary
, &mirror
,
221 * Just stream the histogram, then stop
227 if (streaming
&& histogram
) {
229 mirror
.tid_end
= histogram_ary
[histindex
].tid
;
230 estbytes
= histogram_ary
[histindex
-1].bytes
;
231 mrec_tmp
.pfs
.pfsd
.sync_end_tid
= mirror
.tid_end
;
236 write_mrecord(1, HAMMER_MREC_TYPE_PFSD
,
237 &mrec_tmp
, sizeof(mrec_tmp
.pfs
));
240 * A cycle file overrides the beginning TID only if we are
241 * not operating in two-way or histogram mode.
243 if (TwoWayPipeOpt
== 0 && histogram
== 0)
244 hammer_get_cycle(&mirror
.key_beg
, &mirror
.tid_beg
);
247 * An additional argument overrides the beginning TID regardless
248 * of what mode we are in. This is not recommending if operating
252 mirror
.tid_beg
= strtoull(av
[1], NULL
, 0);
254 if (streaming
== 0 || VerboseOpt
>= 2) {
256 "Mirror-read: Mirror %016jx to %016jx",
257 (uintmax_t)mirror
.tid_beg
, (uintmax_t)mirror
.tid_end
);
259 fprintf(stderr
, " (bulk= %ju)", (uintmax_t)estbytes
);
260 fprintf(stderr
, "\n");
263 if (mirror
.key_beg
.obj_id
!= (int64_t)HAMMER_MIN_OBJID
) {
264 fprintf(stderr
, "Mirror-read: Resuming at object %016jx\n",
265 (uintmax_t)mirror
.key_beg
.obj_id
);
269 * Nothing to do if begin equals end.
271 if (mirror
.tid_beg
>= mirror
.tid_end
) {
272 if (streaming
== 0 || VerboseOpt
>= 2)
273 fprintf(stderr
, "Mirror-read: No work to do\n");
282 * Write out bulk records
285 mirror
.size
= SERIALBUF_SIZE
;
289 mirror
.pfs_id
= pfs
.pfs_id
;
290 mirror
.shared_uuid
= pfs
.ondisk
->shared_uuid
;
291 if (ioctl(fd
, HAMMERIOC_MIRROR_READ
, &mirror
) < 0) {
292 score_printf(LINE3
, "Mirror-read %s failed: %s",
293 filesystem
, strerror(errno
));
294 err(1, "Mirror-read %s failed", filesystem
);
297 if (mirror
.head
.flags
& HAMMER_IOC_HEAD_ERROR
) {
298 score_printf(LINE3
, "Mirror-read %s fatal error %d",
299 filesystem
, mirror
.head
.error
);
300 errx(1, "Mirror-read %s fatal error %d",
301 filesystem
, mirror
.head
.error
);
306 n
= writebw(1, mirror
.ubuf
, mirror
.count
,
309 n
= write(1, mirror
.ubuf
, mirror
.count
);
311 if (n
!= mirror
.count
) {
313 "Mirror-read %s failed: "
316 errx(1, "Mirror-read %s failed: short write",
321 total_bytes
+= mirror
.count
;
322 if (streaming
&& VerboseOpt
) {
324 "\rscan obj=%016jx tids=%016jx:%016jx %11jd",
325 (uintmax_t)mirror
.key_cur
.obj_id
,
326 (uintmax_t)mirror
.tid_beg
,
327 (uintmax_t)mirror
.tid_end
,
328 (intmax_t)total_bytes
);
331 } else if (streaming
) {
333 "obj=%016jx tids=%016jx:%016jx %11jd",
334 (uintmax_t)mirror
.key_cur
.obj_id
,
335 (uintmax_t)mirror
.tid_beg
,
336 (uintmax_t)mirror
.tid_end
,
337 (intmax_t)total_bytes
);
339 mirror
.key_beg
= mirror
.key_cur
;
342 * Deal with time limit option
345 (unsigned)(time(NULL
) - base_t
) > (unsigned)TimeoutOpt
) {
347 "Mirror-read %s interrupted by timer at"
350 (uintmax_t)mirror
.key_cur
.obj_id
);
352 "Mirror-read %s interrupted by timer at"
355 (uintmax_t)mirror
.key_cur
.obj_id
);
359 } while (mirror
.count
!= 0);
362 if (streaming
&& VerboseOpt
&& sameline
== 0) {
363 fprintf(stderr
, "\n");
369 * Write out the termination sync record - only if not interrupted
371 if (interrupted
== 0) {
373 write_mrecord(1, HAMMER_MREC_TYPE_SYNC
,
374 &mrec_tmp
, sizeof(mrec_tmp
.sync
));
376 write_mrecord(1, HAMMER_MREC_TYPE_IDLE
,
377 &mrec_tmp
, sizeof(mrec_tmp
.sync
));
382 * If the -2 option was given (automatic when doing mirror-copy),
383 * a two-way pipe is assumed and we expect a response mrec from
387 mrec
= read_mrecord(0, &error
, &pickup
);
389 mrec
->head
.type
!= HAMMER_MREC_TYPE_UPDATE
||
390 mrec
->head
.rec_size
!= sizeof(mrec
->update
)) {
391 errx(1, "mirror_read: Did not get final "
392 "acknowledgement packet from target");
397 hammer_set_cycle(&mirror
.key_cur
,
399 fprintf(stderr
, "Cyclefile %s updated for "
400 "continuation\n", CyclePath
);
403 sync_tid
= mrec
->update
.tid
;
405 hammer_key_beg_init(&mirror
.key_beg
);
406 hammer_set_cycle(&mirror
.key_beg
, sync_tid
);
408 "Cyclefile %s updated to 0x%016jx\n",
409 CyclePath
, (uintmax_t)sync_tid
);
413 } else if (CyclePath
) {
414 /* NOTE! mirror.tid_beg cannot be updated */
415 fprintf(stderr
, "Warning: cycle file (-c option) cannot be "
416 "fully updated unless you use mirror-copy\n");
417 hammer_set_cycle(&mirror
.key_beg
, mirror
.tid_beg
);
419 if (streaming
&& interrupted
== 0) {
420 time_t t1
= time(NULL
);
424 * Try to break down large bulk transfers into smaller ones
425 * so it can sync the transaction id on the slave. This
426 * way if we get interrupted a restart doesn't have to
427 * start from scratch.
429 if (streaming
&& histogram
) {
430 if (histindex
!= histmax
) {
431 if (VerboseOpt
&& VerboseOpt
< 2 &&
433 fprintf(stderr
, " (bulk incremental)");
440 if (VerboseOpt
&& streaming
>= 0) {
441 fprintf(stderr
, " W");
443 } else if (streaming
>= 0) {
444 score_printf(LINE1
, "Waiting");
446 pfs
.ondisk
->sync_end_tid
= mirror
.tid_end
;
449 * Fake streaming mode when using a histogram to
450 * break up a mirror-read, do not wait on source.
453 } else if (ioctl(fd
, HAMMERIOC_WAI_PSEUDOFS
, &pfs
) < 0) {
455 "Mirror-read %s: cannot stream: %s\n",
456 filesystem
, strerror(errno
));
458 "Mirror-read %s: cannot stream: %s\n",
459 filesystem
, strerror(errno
));
461 t2
= time(NULL
) - t1
;
462 if (t2
>= 0 && t2
< DelayOpt
) {
464 fprintf(stderr
, "\bD");
467 sleep(DelayOpt
- t2
);
470 fprintf(stderr
, "\b ");
477 write_mrecord(1, HAMMER_MREC_TYPE_TERM
,
478 &mrec_tmp
, sizeof(mrec_tmp
.sync
));
482 fprintf(stderr
, "Mirror-read %s succeeded\n", filesystem
);
486 * What we are trying to do here is figure out how much data is
487 * going to be sent for the TID range and to break the TID range
488 * down into reasonably-sized slices (from the point of view of
489 * data sent) so a lost connection can restart at a reasonable
490 * place and not all the way back at the beginning.
492 * An entry's TID serves as the end_tid for the prior entry
493 * So we have to offset the calculation by 1 so that TID falls into
494 * the previous entry when populating entries.
496 * Because the transaction id space is bursty we need a relatively
497 * large number of buckets (like a million) to do a reasonable job
498 * for things like an initial bulk mirrors on a very large filesystem.
500 #define HIST_COUNT (1024 * 1024)
504 generate_histogram(int fd
, const char *filesystem
,
505 histogram_t
*histogram_ary
,
506 struct hammer_ioc_mirror_rw
*mirror_base
,
509 struct hammer_ioc_mirror_rw mirror
;
510 union hammer_ioc_mrecord_any
*mrec
;
511 hammer_tid_t tid_beg
;
512 hammer_tid_t tid_end
;
524 mirror
= *mirror_base
;
525 tid_beg
= mirror
.tid_beg
;
526 tid_end
= mirror
.tid_end
;
527 mirror
.head
.flags
|= HAMMER_IOC_MIRROR_NODATA
;
529 if (*histogram_ary
== NULL
) {
530 *histogram_ary
= malloc(sizeof(struct histogram
) *
533 if (tid_beg
>= tid_end
)
537 tid_bytes
= malloc(sizeof(*tid_bytes
) * (HIST_COUNT
+ 2));
538 bzero(tid_bytes
, sizeof(*tid_bytes
) * (HIST_COUNT
+ 2));
541 fprintf(stderr
, "Prescan to break up bulk transfer");
542 if (VerboseOpt
> 1) {
543 fprintf(stderr
, " (%juMB chunks)",
544 (uintmax_t)(SplitupOpt
/ (1024 * 1024)));
546 fprintf(stderr
, "\n");
550 * Note: (tid_beg,tid_end), range is inclusive of both beg & end.
552 * Note: Estimates can be off when the mirror is way behind due
560 if (ioctl(fd
, HAMMERIOC_MIRROR_READ
, &mirror
) < 0) {
561 err(1, "Mirror-read %s failed", filesystem
);
564 if (mirror
.head
.flags
& HAMMER_IOC_HEAD_ERROR
) {
565 errx(1, "Mirror-read %s fatal error %d",
566 filesystem
, mirror
.head
.error
);
571 off
+= HAMMER_HEAD_DOALIGN(mrec
->head
.rec_size
)) {
572 mrec
= (void *)((char *)mirror
.ubuf
+ off
);
575 * We only care about general RECs and PASS
576 * records. We ignore SKIPs.
578 switch (mrec
->head
.type
& HAMMER_MRECF_TYPE_LOMASK
) {
579 case HAMMER_MREC_TYPE_REC
:
580 case HAMMER_MREC_TYPE_PASS
:
587 * Calculate for two indices, create_tid and
588 * delete_tid. Record data only applies to
591 * When tid is exactly on the boundary it really
592 * belongs to the previous entry because scans
593 * are inclusive of the ending entry.
595 tid
= mrec
->rec
.leaf
.base
.delete_tid
;
596 if (tid
&& tid
>= tid_beg
&& tid
<= tid_end
) {
597 len
= HAMMER_HEAD_DOALIGN(mrec
->head
.rec_size
);
598 if (mrec
->head
.type
==
599 HAMMER_MREC_TYPE_REC
) {
600 len
-= HAMMER_HEAD_DOALIGN(
601 mrec
->rec
.leaf
.data_len
);
604 i
= (tid
- tid_beg
) * HIST_COUNT
/
606 tidx
= tid_beg
+ i
* (tid_end
- tid_beg
) /
608 if (tid
== tidx
&& i
)
610 assert(i
>= 0 && i
< HIST_COUNT
);
616 tid
= mrec
->rec
.leaf
.base
.create_tid
;
617 if (tid
&& tid
>= tid_beg
&& tid
<= tid_end
) {
618 len
= HAMMER_HEAD_DOALIGN(mrec
->head
.rec_size
);
619 if (mrec
->head
.type
==
620 HAMMER_MREC_TYPE_REC_NODATA
) {
621 len
+= HAMMER_HEAD_DOALIGN(
622 mrec
->rec
.leaf
.data_len
);
624 i
= (tid
- tid_beg
) * HIST_COUNT
/
626 tidx
= tid_beg
+ i
* (tid_end
- tid_beg
) /
628 if (tid
== tidx
&& i
)
630 assert(i
>= 0 && i
< HIST_COUNT
);
636 if (*repeatp
== 0 && accum
> SplitupOpt
) {
637 if (VerboseOpt
> 1) {
638 fprintf(stderr
, ".");
642 score_printf(LINE2
, "Prescan chunk %d", chunkno
);
645 if (mirror
.count
== 0)
647 mirror
.key_beg
= mirror
.key_cur
;
651 * Reduce to SplitupOpt (default 4GB) chunks. This code may
652 * use up to two additional elements. Do the array in-place.
654 * Inefficient degenerate cases can occur if we do not accumulate
655 * at least the requested split amount, so error on the side of
659 (*histogram_ary
)[res
].tid
= tid_beg
;
660 (*histogram_ary
)[res
].bytes
= tid_bytes
[0];
661 for (i
= 1; i
< HIST_COUNT
; ++i
) {
662 if ((*histogram_ary
)[res
].bytes
>= SplitupOpt
) {
664 (*histogram_ary
)[res
].tid
= tid_beg
+
665 i
* (tid_end
- tid_beg
) /
667 (*histogram_ary
)[res
].bytes
= 0;
670 (*histogram_ary
)[res
].bytes
+= tid_bytes
[i
];
673 (*histogram_ary
)[res
].tid
= tid_end
;
674 (*histogram_ary
)[res
].bytes
= -1;
678 fprintf(stderr
, "\n"); /* newline after ... */
679 score_printf(LINE3
, "Prescan %d chunks, total %ju MBytes",
680 res
, (uintmax_t)total
/ (1024 * 1024));
681 fprintf(stderr
, "Prescan %d chunks, total %ju MBytes (",
682 res
, (uintmax_t)total
/ (1024 * 1024));
683 for (i
= 0; i
< res
&& i
< 3; ++i
) {
685 fprintf(stderr
, ", ");
686 fprintf(stderr
, "%ju",
687 (uintmax_t)(*histogram_ary
)[i
].bytes
);
690 fprintf(stderr
, ", ...");
691 fprintf(stderr
, ")\n");
693 assert(res
<= HIST_COUNT
);
702 create_pfs(const char *filesystem
, hammer_uuid_t
*s_uuid
)
704 if (ForceYesOpt
== 1) {
705 fprintf(stderr
, "PFS slave %s does not exist. "
706 "Auto create new slave PFS!\n", filesystem
);
709 fprintf(stderr
, "PFS slave %s does not exist.\n"
710 "Do you want to create a new slave PFS? [y/n] ",
713 if (getyntty() != 1) {
714 errx(1, "Aborting operation");
719 char *shared_uuid
= NULL
;
720 hammer_uuid_to_string(s_uuid
, &shared_uuid
);
723 asprintf(&cmd
, "/sbin/hammer pfs-slave '%s' shared-uuid=%s 1>&2",
724 filesystem
, shared_uuid
);
728 errx(1, "Failed to alloc memory");
731 if (system(cmd
) != 0)
732 fprintf(stderr
, "Failed to create PFS\n");
737 * Pipe the mirroring data stream on stdin to the HAMMER VFS, adding
738 * some additional packet types to negotiate TID ranges and to verify
739 * completion. The HAMMER VFS does most of the work.
741 * It is important to note that the mirror.key_{beg,end} range must
742 * match the ranged used by the original. For now both sides use
743 * range the entire key space.
745 * It is even more important that the records in the stream conform
746 * to the TID range also supplied in the stream. The HAMMER VFS will
747 * use the REC, PASS, and SKIP record types to track the portions of
748 * the B-Tree being scanned in order to be able to proactively delete
749 * records on the target within those active areas that are not mentioned
752 * The mirror.key_cur field is used by the VFS to do this tracking. It
753 * must be initialized to key_beg but then is persistently updated by
754 * the HAMMER VFS on each successive ioctl() call. If you blow up this
755 * field you will blow up the mirror target, possibly to the point of
756 * deleting everything. As a safety measure the HAMMER VFS simply marks
757 * the records that the source has destroyed as deleted on the target,
758 * and normal pruning operations will deal with their final disposition
759 * at some later time.
762 hammer_cmd_mirror_write(char **av
, int ac
)
764 struct hammer_ioc_mirror_rw mirror
;
765 const char *filesystem
;
766 char *buf
= malloc(SERIALBUF_SIZE
);
767 struct hammer_ioc_pseudofs_rw pfs
;
768 struct hammer_ioc_mrecord_head pickup
;
769 struct hammer_ioc_synctid synctid
;
770 union hammer_ioc_mrecord_any mrec_tmp
;
771 hammer_ioc_mrecord_any_t mrec
;
782 hammer_check_restrict(filesystem
);
784 pickup
.signature
= 0;
788 bzero(&mirror
, sizeof(mirror
));
789 hammer_key_beg_init(&mirror
.key_beg
);
790 hammer_key_end_init(&mirror
.key_end
);
791 mirror
.key_end
= mirror
.key_beg
;
794 * Read initial packet
796 mrec
= read_mrecord(0, &error
, &pickup
);
799 errx(1, "validate_mrec_header: short read");
807 if (mrec
->head
.type
== HAMMER_MREC_TYPE_TERM
) {
811 if (mrec
->head
.type
!= HAMMER_MREC_TYPE_PFSD
) {
812 errx(1, "validate_mrec_header: did not get expected "
816 if (mrec
->head
.rec_size
!= sizeof(mrec
->pfs
)) {
817 errx(1, "validate_mrec_header: unexpected payload size");
822 * Create slave PFS if it doesn't yet exist
824 if (lstat(filesystem
, &st
) != 0)
825 create_pfs(filesystem
, &mrec
->pfs
.pfsd
.shared_uuid
);
829 fd
= getpfs(&pfs
, filesystem
);
832 * In two-way mode the target writes out a PFS packet first.
833 * The source uses our tid_end as its tid_beg by default,
834 * picking up where it left off.
838 generate_mrec_header(fd
, pfs
.pfs_id
, &mrec_tmp
);
839 if (mirror
.tid_beg
< mrec_tmp
.pfs
.pfsd
.sync_beg_tid
)
840 mirror
.tid_beg
= mrec_tmp
.pfs
.pfsd
.sync_beg_tid
;
841 mirror
.tid_end
= mrec_tmp
.pfs
.pfsd
.sync_end_tid
;
842 write_mrecord(1, HAMMER_MREC_TYPE_PFSD
,
843 &mrec_tmp
, sizeof(mrec_tmp
.pfs
));
847 * Read and process the PFS header. The source informs us of
848 * the TID range the stream represents.
850 n
= validate_mrec_header(fd
, 0, 1, pfs
.pfs_id
, &pickup
,
851 &mirror
.tid_beg
, &mirror
.tid_end
);
852 if (n
< 0) { /* got TERM record */
859 mirror
.size
= SERIALBUF_SIZE
;
862 * Read and process bulk records (REC, PASS, and SKIP types).
864 * On your life, do NOT mess with mirror.key_cur or your mirror
865 * target may become history.
869 mirror
.pfs_id
= pfs
.pfs_id
;
870 mirror
.shared_uuid
= pfs
.ondisk
->shared_uuid
;
871 mirror
.size
= read_mrecords(0, buf
, SERIALBUF_SIZE
, &pickup
);
872 if (mirror
.size
<= 0)
874 if (ioctl(fd
, HAMMERIOC_MIRROR_WRITE
, &mirror
) < 0) {
875 err(1, "Mirror-write %s failed", filesystem
);
878 if (mirror
.head
.flags
& HAMMER_IOC_HEAD_ERROR
) {
879 errx(1, "Mirror-write %s fatal error %d",
880 filesystem
, mirror
.head
.error
);
884 if (mirror
.head
.flags
& HAMMER_IOC_HEAD_INTR
) {
885 errx(1, "Mirror-write %s interrupted by timer at"
888 mirror
.key_cur
.obj_id
);
895 * Read and process the termination sync record.
897 mrec
= read_mrecord(0, &error
, &pickup
);
899 if (mrec
&& mrec
->head
.type
== HAMMER_MREC_TYPE_TERM
) {
900 fprintf(stderr
, "Mirror-write: received termination request\n");
908 (mrec
->head
.type
!= HAMMER_MREC_TYPE_SYNC
&&
909 mrec
->head
.type
!= HAMMER_MREC_TYPE_IDLE
) ||
910 mrec
->head
.rec_size
!= sizeof(mrec
->sync
)) {
911 errx(1, "Mirror-write %s: Did not get termination "
912 "sync record, or rec_size is wrong rt=%d",
913 filesystem
, (mrec
? (int)mrec
->head
.type
: -1));
918 * Update the PFS info on the target so the user has visibility
919 * into the new snapshot, and sync the target filesystem.
921 if (mrec
->head
.type
== HAMMER_MREC_TYPE_SYNC
) {
922 update_pfs_snapshot(fd
, mirror
.tid_end
, pfs
.pfs_id
);
924 bzero(&synctid
, sizeof(synctid
));
925 synctid
.op
= HAMMER_SYNCTID_SYNC2
;
926 ioctl(fd
, HAMMERIOC_SYNCTID
, &synctid
);
928 if (VerboseOpt
>= 2) {
929 fprintf(stderr
, "Mirror-write %s: succeeded\n",
938 * Report back to the originator.
941 mrec_tmp
.update
.tid
= mirror
.tid_end
;
942 write_mrecord(1, HAMMER_MREC_TYPE_UPDATE
,
943 &mrec_tmp
, sizeof(mrec_tmp
.update
));
945 printf("Source can update synctid to 0x%016jx\n",
946 (uintmax_t)mirror
.tid_end
);
953 hammer_cmd_mirror_dump(char **av
, int ac
)
955 char *buf
= malloc(SERIALBUF_SIZE
);
956 struct hammer_ioc_mrecord_head pickup
;
957 hammer_ioc_mrecord_any_t mrec
;
964 if (ac
== 1 && strcmp(*av
, "header") == 0) {
966 } else if (ac
!= 0) {
972 * Read and process the PFS header
974 pickup
.signature
= 0;
977 mrec
= read_mrecord(0, &error
, &pickup
);
980 * Dump the PFS header. mirror-dump takes its input from the output
981 * of a mirror-read so getpfs() can't be used to get a fd to be passed
984 if (header_only
&& mrec
!= NULL
) {
985 dump_pfsd(&mrec
->pfs
.pfsd
, -1);
994 * Read and process bulk records
997 size
= read_mrecords(0, buf
, SERIALBUF_SIZE
, &pickup
);
1001 while (offset
< size
) {
1002 mrec
= (void *)((char *)buf
+ offset
);
1003 bytes
= HAMMER_HEAD_DOALIGN(mrec
->head
.rec_size
);
1004 if (offset
+ bytes
> size
) {
1005 errx(1, "Misaligned record");
1009 switch(mrec
->head
.type
& HAMMER_MRECF_TYPE_MASK
) {
1010 case HAMMER_MREC_TYPE_REC_BADCRC
:
1011 case HAMMER_MREC_TYPE_REC
:
1012 printf("Record lo=%08x obj=%016jx key=%016jx "
1014 mrec
->rec
.leaf
.base
.localization
,
1015 (uintmax_t)mrec
->rec
.leaf
.base
.obj_id
,
1016 (uintmax_t)mrec
->rec
.leaf
.base
.key
,
1017 mrec
->rec
.leaf
.base
.rec_type
,
1018 mrec
->rec
.leaf
.base
.obj_type
);
1019 if (mrec
->head
.type
==
1020 HAMMER_MREC_TYPE_REC_BADCRC
) {
1021 printf(" (BAD CRC)");
1024 printf(" tids %016jx:%016jx data=%d\n",
1025 (uintmax_t)mrec
->rec
.leaf
.base
.create_tid
,
1026 (uintmax_t)mrec
->rec
.leaf
.base
.delete_tid
,
1027 mrec
->rec
.leaf
.data_len
);
1029 case HAMMER_MREC_TYPE_PASS
:
1030 printf("Pass lo=%08x obj=%016jx key=%016jx "
1031 "rt=%02x ot=%02x\n",
1032 mrec
->rec
.leaf
.base
.localization
,
1033 (uintmax_t)mrec
->rec
.leaf
.base
.obj_id
,
1034 (uintmax_t)mrec
->rec
.leaf
.base
.key
,
1035 mrec
->rec
.leaf
.base
.rec_type
,
1036 mrec
->rec
.leaf
.base
.obj_type
);
1037 printf(" tids %016jx:%016jx data=%d\n",
1038 (uintmax_t)mrec
->rec
.leaf
.base
.create_tid
,
1039 (uintmax_t)mrec
->rec
.leaf
.base
.delete_tid
,
1040 mrec
->rec
.leaf
.data_len
);
1042 case HAMMER_MREC_TYPE_SKIP
:
1043 printf("Skip lo=%08x obj=%016jx key=%016jx rt=%02x to\n"
1044 " lo=%08x obj=%016jx key=%016jx rt=%02x\n",
1045 mrec
->skip
.skip_beg
.localization
,
1046 (uintmax_t)mrec
->skip
.skip_beg
.obj_id
,
1047 (uintmax_t)mrec
->skip
.skip_beg
.key
,
1048 mrec
->skip
.skip_beg
.rec_type
,
1049 mrec
->skip
.skip_end
.localization
,
1050 (uintmax_t)mrec
->skip
.skip_end
.obj_id
,
1051 (uintmax_t)mrec
->skip
.skip_end
.key
,
1052 mrec
->skip
.skip_end
.rec_type
);
1061 * Read and process the termination sync record.
1063 mrec
= read_mrecord(0, &error
, &pickup
);
1065 (mrec
->head
.type
!= HAMMER_MREC_TYPE_SYNC
&&
1066 mrec
->head
.type
!= HAMMER_MREC_TYPE_IDLE
)) {
1067 fprintf(stderr
, "Mirror-dump: Did not get termination "
1073 * Continue with more batches until EOF.
1075 mrec
= read_mrecord(0, &error
, &pickup
);
1084 hammer_cmd_mirror_copy(char **av
, int ac
, int streaming
)
1089 const char *xav
[32];
1091 char *sh
, *user
, *host
, *rfs
;
1100 signal(SIGPIPE
, SIG_IGN
);
1103 if (pipe(fds
) < 0) {
1111 if ((pid1
= fork()) == 0) {
1112 signal(SIGPIPE
, SIG_DFL
);
1117 if ((rfs
= strchr(av
[0], ':')) != NULL
) {
1120 if((sh
= getenv("HAMMER_RSH")) == NULL
)
1128 if ((host
= strchr(av
[0], '@')) != NULL
) {
1129 user
= strndup( av
[0], (host
++ - av
[0]));
1130 host
= strndup( host
, (rfs
++ - host
));
1135 host
= strndup( av
[0], (rfs
++ - av
[0]));
1143 xav
[xac
++] = SshPort
;
1146 xav
[xac
++] = "hammer";
1148 switch(VerboseOpt
) {
1158 xav
[xac
++] = "-vvv";
1165 snprintf(tbuf
, sizeof(tbuf
), "%d", TimeoutOpt
);
1169 if (SplitupOptStr
) {
1171 xav
[xac
++] = SplitupOptStr
;
1174 xav
[xac
++] = "mirror-read-stream";
1176 xav
[xac
++] = "mirror-read";
1179 execvp(*xav
, (void *)xav
);
1181 hammer_cmd_mirror_read(av
, 1, streaming
);
1191 if ((pid2
= fork()) == 0) {
1192 signal(SIGPIPE
, SIG_DFL
);
1197 if ((rfs
= strchr(av
[1], ':')) != NULL
) {
1200 if((sh
= getenv("HAMMER_RSH")) == NULL
)
1208 if ((host
= strchr(av
[1], '@')) != NULL
) {
1209 user
= strndup( av
[1], (host
++ - av
[1]));
1210 host
= strndup( host
, (rfs
++ - host
));
1215 host
= strndup( av
[1], (rfs
++ - av
[1]));
1222 xav
[xac
++] = SshPort
;
1225 xav
[xac
++] = "hammer";
1227 switch(VerboseOpt
) {
1237 xav
[xac
++] = "-vvv";
1243 xav
[xac
++] = "mirror-write";
1246 execvp(*xav
, (void *)xav
);
1248 hammer_cmd_mirror_write(av
+ 1, 1);
1257 while (waitpid(pid1
, NULL
, 0) <= 0)
1259 while (waitpid(pid2
, NULL
, 0) <= 0)
1263 * If the link is lost restart
1267 fprintf(stderr
, "\nLost Link\n");
1270 sleep(15 + DelayOpt
);
1277 * Read and return multiple mrecords
1281 read_mrecords(int fd
, char *buf
, u_int size
, struct hammer_ioc_mrecord_head
*pickup
)
1283 hammer_ioc_mrecord_any_t mrec
;
1291 while (size
- count
>= HAMMER_MREC_HEADSIZE
) {
1293 * Cached the record header in case we run out of buffer
1297 if (pickup
->signature
== 0) {
1298 for (n
= 0; n
< HAMMER_MREC_HEADSIZE
; n
+= i
) {
1299 i
= read(fd
, (char *)pickup
+ n
,
1300 HAMMER_MREC_HEADSIZE
- n
);
1306 if (n
!= HAMMER_MREC_HEADSIZE
) {
1307 errx(1, "read_mrecords: short read on pipe");
1310 if (pickup
->signature
!= HAMMER_IOC_MIRROR_SIGNATURE
) {
1311 errx(1, "read_mrecords: malformed record on pipe, "
1316 if (pickup
->rec_size
< HAMMER_MREC_HEADSIZE
||
1317 pickup
->rec_size
> sizeof(*mrec
) + HAMMER_XBUFSIZE
) {
1318 errx(1, "read_mrecords: malformed record on pipe, "
1319 "illegal rec_size");
1324 * Stop if we have insufficient space for the record and data.
1326 bytes
= HAMMER_HEAD_DOALIGN(pickup
->rec_size
);
1327 if (size
- count
< bytes
)
1331 * Stop if the record type is not a REC, SKIP, or PASS,
1332 * which are the only types the ioctl supports. Other types
1333 * are used only by the userland protocol.
1337 type
= pickup
->type
& HAMMER_MRECF_TYPE_LOMASK
;
1338 if (type
!= HAMMER_MREC_TYPE_PFSD
&&
1339 type
!= HAMMER_MREC_TYPE_REC
&&
1340 type
!= HAMMER_MREC_TYPE_SKIP
&&
1341 type
!= HAMMER_MREC_TYPE_PASS
) {
1346 * Read the remainder and clear the pickup signature.
1348 for (n
= HAMMER_MREC_HEADSIZE
; n
< bytes
; n
+= i
) {
1349 i
= read(fd
, buf
+ count
+ n
, bytes
- n
);
1354 errx(1, "read_mrecords: short read on pipe");
1358 bcopy(pickup
, buf
+ count
, HAMMER_MREC_HEADSIZE
);
1359 pickup
->signature
= 0;
1361 mrec
= (void *)(buf
+ count
);
1364 * Validate the completed record
1366 if (!hammer_crc_test_mrec_head(&mrec
->head
, mrec
->head
.rec_size
)) {
1367 errx(1, "read_mrecords: malformed record on pipe, bad crc");
1372 * If its a B-Tree record validate the data crc.
1374 * NOTE: If the VFS passes us an explicitly errorde mrec
1375 * we just pass it through.
1377 type
= mrec
->head
.type
& HAMMER_MRECF_TYPE_MASK
;
1379 if (type
== HAMMER_MREC_TYPE_REC
) {
1380 if (mrec
->head
.rec_size
<
1381 sizeof(mrec
->rec
) + mrec
->rec
.leaf
.data_len
) {
1382 errx(1, "read_mrecords: malformed record on "
1383 "pipe, illegal element data_len");
1386 if (mrec
->rec
.leaf
.data_len
&&
1387 mrec
->rec
.leaf
.data_offset
&&
1388 hammer_crc_test_leaf(HammerVersion
, &mrec
->rec
+ 1, &mrec
->rec
.leaf
) == 0) {
1390 "read_mrecords: data_crc did not "
1391 "match data! obj=%016jx key=%016jx\n",
1392 (uintmax_t)mrec
->rec
.leaf
.base
.obj_id
,
1393 (uintmax_t)mrec
->rec
.leaf
.base
.key
);
1395 "continuing, but there are problems\n");
1404 * Read and return a single mrecord.
1407 hammer_ioc_mrecord_any_t
1408 read_mrecord(int fdin
, int *errorp
, struct hammer_ioc_mrecord_head
*pickup
)
1410 hammer_ioc_mrecord_any_t mrec
;
1411 struct hammer_ioc_mrecord_head mrechd
;
1416 if (pickup
&& pickup
->type
!= 0) {
1418 pickup
->signature
= 0;
1420 n
= HAMMER_MREC_HEADSIZE
;
1423 * Read in the PFSD header from the sender.
1425 for (n
= 0; n
< HAMMER_MREC_HEADSIZE
; n
+= i
) {
1426 i
= read(fdin
, (char *)&mrechd
+ n
, HAMMER_MREC_HEADSIZE
- n
);
1431 *errorp
= 0; /* EOF */
1434 if (n
!= HAMMER_MREC_HEADSIZE
) {
1435 fprintf(stderr
, "short read of mrecord header\n");
1440 if (mrechd
.signature
!= HAMMER_IOC_MIRROR_SIGNATURE
) {
1441 fprintf(stderr
, "read_mrecord: bad signature\n");
1445 bytes
= HAMMER_HEAD_DOALIGN(mrechd
.rec_size
);
1446 assert(bytes
>= sizeof(mrechd
));
1447 mrec
= malloc(bytes
);
1448 mrec
->head
= mrechd
;
1451 i
= read(fdin
, (char *)mrec
+ n
, bytes
- n
);
1457 fprintf(stderr
, "read_mrecord: short read on payload\n");
1461 if (!hammer_crc_test_mrec_head(&mrec
->head
, mrec
->head
.rec_size
)) {
1462 fprintf(stderr
, "read_mrecord: bad CRC\n");
1472 write_mrecord(int fdout
, uint32_t type
, hammer_ioc_mrecord_any_t mrec
,
1475 char zbuf
[HAMMER_HEAD_ALIGN
];
1478 pad
= HAMMER_HEAD_DOALIGN(bytes
) - bytes
;
1480 assert(bytes
>= (int)sizeof(mrec
->head
));
1481 bzero(&mrec
->head
, sizeof(mrec
->head
));
1482 mrec
->head
.signature
= HAMMER_IOC_MIRROR_SIGNATURE
;
1483 mrec
->head
.type
= type
;
1484 mrec
->head
.rec_size
= bytes
;
1485 hammer_crc_set_mrec_head(&mrec
->head
, bytes
);
1486 if (write(fdout
, mrec
, bytes
) != bytes
) {
1487 err(1, "write_mrecord");
1492 if (write(fdout
, zbuf
, pad
) != pad
) {
1493 err(1, "write_mrecord");
1500 * Generate a mirroring header with the pfs information of the
1501 * originating filesytem.
1505 generate_mrec_header(int fd
, int pfs_id
,
1506 union hammer_ioc_mrecord_any
*mrec_tmp
)
1508 struct hammer_ioc_pseudofs_rw pfs
;
1510 bzero(mrec_tmp
, sizeof(*mrec_tmp
));
1511 clrpfs(&pfs
, &mrec_tmp
->pfs
.pfsd
, pfs_id
);
1513 if (ioctl(fd
, HAMMERIOC_GET_PSEUDOFS
, &pfs
) != 0) {
1514 err(1, "Mirror-read: not a HAMMER fs/pseudofs!");
1517 if (pfs
.version
!= HAMMER_IOC_PSEUDOFS_VERSION
) {
1518 errx(1, "Mirror-read: HAMMER PFS version mismatch!");
1521 mrec_tmp
->pfs
.version
= pfs
.version
;
1525 * Validate the pfs information from the originating filesystem
1526 * against the target filesystem. shared_uuid must match.
1528 * return -1 if we got a TERM record
1532 validate_mrec_header(int fd
, int fdin
, int is_target
, int pfs_id
,
1533 struct hammer_ioc_mrecord_head
*pickup
,
1534 hammer_tid_t
*tid_begp
, hammer_tid_t
*tid_endp
)
1536 struct hammer_ioc_pseudofs_rw pfs
;
1537 struct hammer_pseudofs_data pfsd
;
1538 hammer_ioc_mrecord_any_t mrec
;
1542 * Get the PFSD info from the target filesystem.
1544 clrpfs(&pfs
, &pfsd
, pfs_id
);
1545 if (ioctl(fd
, HAMMERIOC_GET_PSEUDOFS
, &pfs
) != 0) {
1546 err(1, "mirror-write: not a HAMMER fs/pseudofs!");
1549 if (pfs
.version
!= HAMMER_IOC_PSEUDOFS_VERSION
) {
1550 errx(1, "mirror-write: HAMMER PFS version mismatch!");
1554 mrec
= read_mrecord(fdin
, &error
, pickup
);
1557 errx(1, "validate_mrec_header: short read");
1562 if (mrec
->head
.type
== HAMMER_MREC_TYPE_TERM
) {
1567 if (mrec
->head
.type
!= HAMMER_MREC_TYPE_PFSD
) {
1568 errx(1, "validate_mrec_header: did not get expected "
1569 "PFSD record type");
1572 if (mrec
->head
.rec_size
!= sizeof(mrec
->pfs
)) {
1573 errx(1, "validate_mrec_header: unexpected payload size");
1576 if (mrec
->pfs
.version
!= pfs
.version
) {
1577 errx(1, "validate_mrec_header: Version mismatch");
1582 * Whew. Ok, is the read PFS info compatible with the target?
1584 if (hammer_uuid_compare(&mrec
->pfs
.pfsd
.shared_uuid
, &pfsd
.shared_uuid
)) {
1585 errx(1, "mirror-write: source and target have "
1586 "different shared-uuid's!");
1589 if (is_target
&& hammer_is_pfs_master(&pfsd
)) {
1590 errx(1, "mirror-write: target must be in slave mode");
1594 *tid_begp
= mrec
->pfs
.pfsd
.sync_beg_tid
;
1596 *tid_endp
= mrec
->pfs
.pfsd
.sync_end_tid
;
1603 update_pfs_snapshot(int fd
, hammer_tid_t snapshot_tid
, int pfs_id
)
1605 struct hammer_ioc_pseudofs_rw pfs
;
1606 struct hammer_pseudofs_data pfsd
;
1608 clrpfs(&pfs
, &pfsd
, pfs_id
);
1609 if (ioctl(fd
, HAMMERIOC_GET_PSEUDOFS
, &pfs
) != 0) {
1610 err(1, "update_pfs_snapshot (read)");
1614 if (pfsd
.sync_end_tid
!= snapshot_tid
) {
1615 pfsd
.sync_end_tid
= snapshot_tid
;
1616 if (ioctl(fd
, HAMMERIOC_SET_PSEUDOFS
, &pfs
) != 0) {
1617 err(1, "update_pfs_snapshot (rewrite)");
1620 if (VerboseOpt
>= 2) {
1622 "Mirror-write: Completed, updated snapshot "
1624 (uintmax_t)snapshot_tid
);
1631 * Bandwidth-limited write in chunks
1635 writebw(int fd
, const void *buf
, size_t nbytes
,
1636 uint64_t *bwcount
, struct timeval
*tv1
)
1647 if (*bwcount
+ nbytes
> BandwidthOpt
)
1648 n
= BandwidthOpt
- *bwcount
;
1652 r
= write(fd
, buf
, n
);
1656 buf
= (const char *)buf
+ r
;
1661 if (*bwcount
>= BandwidthOpt
) {
1662 gettimeofday(&tv2
, NULL
);
1663 usec
= (int)(tv2
.tv_sec
- tv1
->tv_sec
) * 1000000 +
1664 (int)(tv2
.tv_usec
- tv1
->tv_usec
);
1665 if (usec
>= 0 && usec
< 1000000)
1666 usleep(1000000 - usec
);
1667 gettimeofday(tv1
, NULL
);
1668 *bwcount
-= BandwidthOpt
;
1675 * Get a yes or no answer from the terminal. The program may be run as
1676 * part of a two-way pipe so we cannot use stdin for this operation.
1686 fp
= fopen("/dev/tty", "r");
1688 fprintf(stderr
, "No terminal for response\n");
1692 while (fgets(buf
, sizeof(buf
), fp
) != NULL
) {
1693 if (buf
[0] == 'y' || buf
[0] == 'Y') {
1697 if (buf
[0] == 'n' || buf
[0] == 'N') {
1701 fprintf(stderr
, "Response not understood\n");
1710 score_printf(size_t i
, size_t w
, const char *ctl
, ...)
1714 static size_t SSize
;
1715 static int SFd
= -1;
1716 static char ScoreBuf
[1024];
1718 if (ScoreBoardFile
== NULL
)
1720 assert(i
+ w
< sizeof(ScoreBuf
));
1722 SFd
= open(ScoreBoardFile
, O_RDWR
|O_CREAT
|O_TRUNC
, 0644);
1727 for (n
= 0; n
< i
; ++n
) {
1728 if (ScoreBuf
[n
] == 0)
1732 vsnprintf(ScoreBuf
+ i
, w
- 1, ctl
, va
);
1734 n
= strlen(ScoreBuf
+ i
);
1736 ScoreBuf
[i
+ n
] = ' ';
1739 ScoreBuf
[i
+ n
] = '\n';
1742 pwrite(SFd
, ScoreBuf
, SSize
, 0);
1747 hammer_check_restrict(const char *filesystem
)
1752 if (RestrictTarget
== NULL
)
1754 rlen
= strlen(RestrictTarget
);
1755 if (strncmp(filesystem
, RestrictTarget
, rlen
) != 0) {
1756 errx(1, "hammer-remote: restricted target");
1761 while (filesystem
[rlen
]) {
1763 filesystem
[rlen
] == '.' &&
1764 filesystem
[rlen
+1] == '.') {
1765 errx(1, "hammer-remote: '..' not allowed");
1768 if (filesystem
[rlen
] == '/')
1778 mirror_usage(int code
)
1781 "hammer mirror-read <filesystem> [begin-tid]\n"
1782 "hammer mirror-read-stream <filesystem> [begin-tid]\n"
1783 "hammer mirror-write <filesystem>\n"
1784 "hammer mirror-dump [header]\n"
1785 "hammer mirror-copy [[user@]host:]<filesystem>"
1786 " [[user@]host:]<filesystem>\n"
1787 "hammer mirror-stream [[user@]host:]<filesystem>"
1788 " [[user@]host:]<filesystem>\n"