2 * Copyright (c) 2010 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Ilya Dryomov <idryomov@gmail.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
36 #include <crypto/sha2/sha2.h>
40 #define DEDUP_BUF (64 * 1024)
42 /* Sorted list of block CRCs - light version for dedup-simulate */
43 struct sim_dedup_entry_rb_tree
;
44 RB_HEAD(sim_dedup_entry_rb_tree
, sim_dedup_entry
) sim_dedup_tree
=
45 RB_INITIALIZER(&sim_dedup_tree
);
46 RB_PROTOTYPE2(sim_dedup_entry_rb_tree
, sim_dedup_entry
, rb_entry
,
47 rb_sim_dedup_entry_compare
, hammer_crc_t
);
49 struct sim_dedup_entry
{
51 uint64_t ref_blks
; /* number of blocks referenced */
52 uint64_t ref_size
; /* size of data referenced */
53 RB_ENTRY(sim_dedup_entry
) rb_entry
;
57 struct hammer_btree_leaf_elm leaf
;
63 RB_HEAD(sha_dedup_entry_rb_tree
, sha_dedup_entry
) fict_root
;
66 RB_ENTRY(dedup_entry
) rb_entry
;
69 #define HAMMER_DEDUP_ENTRY_FICTITIOUS 0x0001
71 struct sha_dedup_entry
{
72 struct hammer_btree_leaf_elm leaf
;
75 uint8_t sha_hash
[SHA256_DIGEST_LENGTH
];
76 RB_ENTRY(sha_dedup_entry
) fict_entry
;
79 /* Sorted list of HAMMER B-Tree keys */
80 struct dedup_entry_rb_tree
;
81 struct sha_dedup_entry_rb_tree
;
83 RB_HEAD(dedup_entry_rb_tree
, dedup_entry
) dedup_tree
=
84 RB_INITIALIZER(&dedup_tree
);
85 RB_PROTOTYPE2(dedup_entry_rb_tree
, dedup_entry
, rb_entry
,
86 rb_dedup_entry_compare
, hammer_crc_t
);
88 RB_PROTOTYPE(sha_dedup_entry_rb_tree
, sha_dedup_entry
, fict_entry
,
89 rb_sha_dedup_entry_compare
);
92 * Pass2 list - contains entries that were not dedup'ed because ioctl failed
94 STAILQ_HEAD(, pass2_dedup_entry
) pass2_dedup_queue
=
95 STAILQ_HEAD_INITIALIZER(pass2_dedup_queue
);
97 struct pass2_dedup_entry
{
98 struct hammer_btree_leaf_elm leaf
;
99 STAILQ_ENTRY(pass2_dedup_entry
) sq_entry
;
102 #define DEDUP_PASS2 0x0001 /* process_btree_elm() mode */
104 static int SigInfoFlag
;
105 static int SigAlrmFlag
;
106 static int64_t DedupDataReads
;
107 static int64_t DedupCurrentRecords
;
108 static int64_t DedupTotalRecords
;
109 static uint32_t DedupCrcStart
;
110 static uint32_t DedupCrcEnd
;
111 static uint64_t MemoryUse
;
113 /* PFS global ids - we deal with just one PFS at a run */
115 static struct hammer_ioc_pseudofs_rw glob_pfs
;
118 * Global accounting variables
120 * Last three don't have to be 64-bit, just to be safe..
122 static uint64_t dedup_alloc_size
;
123 static uint64_t dedup_ref_size
;
124 static uint64_t dedup_skipped_size
;
125 static uint64_t dedup_crc_failures
;
126 static uint64_t dedup_sha_failures
;
127 static uint64_t dedup_underflows
;
128 static uint64_t dedup_successes_count
;
129 static uint64_t dedup_successes_bytes
;
131 static int rb_sim_dedup_entry_compare(struct sim_dedup_entry
*sim_de1
,
132 struct sim_dedup_entry
*sim_de2
);
133 static int rb_dedup_entry_compare(struct dedup_entry
*de1
,
134 struct dedup_entry
*de2
);
135 static int rb_sha_dedup_entry_compare(struct sha_dedup_entry
*sha_de1
,
136 struct sha_dedup_entry
*sha_de2
);
137 typedef int (*scan_pfs_cb_t
)(hammer_btree_leaf_elm_t scan_leaf
, int flags
);
138 static void scan_pfs(char *filesystem
, scan_pfs_cb_t func
, const char *id
);
139 static int collect_btree_elm(hammer_btree_leaf_elm_t scan_leaf
, int flags
);
140 static int count_btree_elm(hammer_btree_leaf_elm_t scan_leaf
, int flags
);
141 static int process_btree_elm(hammer_btree_leaf_elm_t scan_leaf
, int flags
);
142 static int upgrade_chksum(hammer_btree_leaf_elm_t leaf
, uint8_t *sha_hash
);
143 static void dump_simulated_dedup(void);
144 static void dump_real_dedup(void);
145 static void dedup_usage(int code
);
147 RB_GENERATE2(sim_dedup_entry_rb_tree
, sim_dedup_entry
, rb_entry
,
148 rb_sim_dedup_entry_compare
, hammer_crc_t
, crc
);
149 RB_GENERATE2(dedup_entry_rb_tree
, dedup_entry
, rb_entry
,
150 rb_dedup_entry_compare
, hammer_crc_t
, leaf
.data_crc
);
151 RB_GENERATE(sha_dedup_entry_rb_tree
, sha_dedup_entry
, fict_entry
,
152 rb_sha_dedup_entry_compare
);
155 rb_sim_dedup_entry_compare(struct sim_dedup_entry
*sim_de1
,
156 struct sim_dedup_entry
*sim_de2
)
158 if (sim_de1
->crc
< sim_de2
->crc
)
160 if (sim_de1
->crc
> sim_de2
->crc
)
167 rb_dedup_entry_compare(struct dedup_entry
*de1
, struct dedup_entry
*de2
)
169 if (de1
->leaf
.data_crc
< de2
->leaf
.data_crc
)
171 if (de1
->leaf
.data_crc
> de2
->leaf
.data_crc
)
178 rb_sha_dedup_entry_compare(struct sha_dedup_entry
*sha_de1
,
179 struct sha_dedup_entry
*sha_de2
)
181 unsigned long *h1
= (unsigned long *)&sha_de1
->sha_hash
;
182 unsigned long *h2
= (unsigned long *)&sha_de2
->sha_hash
;
185 for (i
= 0; i
< SHA256_DIGEST_LENGTH
/ (int)sizeof(unsigned long); ++i
) {
196 * dedup-simulate <filesystem>
199 hammer_cmd_dedup_simulate(char **av
, int ac
)
201 struct sim_dedup_entry
*sim_de
;
206 glob_fd
= getpfs(&glob_pfs
, av
[0]);
209 * Collection passes (memory limited)
211 printf("Dedup-simulate running\n");
213 DedupCrcStart
= DedupCrcEnd
;
218 printf("B-Tree pass crc-range %08x-max\n",
222 scan_pfs(av
[0], collect_btree_elm
, "simu-pass");
225 dump_simulated_dedup();
228 * Calculate simulated dedup ratio and get rid of the tree
230 while ((sim_de
= RB_ROOT(&sim_dedup_tree
)) != NULL
) {
231 assert(sim_de
->ref_blks
!= 0);
232 dedup_ref_size
+= sim_de
->ref_size
;
233 dedup_alloc_size
+= sim_de
->ref_size
/ sim_de
->ref_blks
;
235 RB_REMOVE(sim_dedup_entry_rb_tree
, &sim_dedup_tree
, sim_de
);
238 if (DedupCrcEnd
&& VerboseOpt
== 0)
240 } while (DedupCrcEnd
);
242 printf("Dedup-simulate %s succeeded\n", av
[0]);
243 relpfs(glob_fd
, &glob_pfs
);
245 printf("Simulated dedup ratio = %.2f\n",
246 (dedup_alloc_size
!= 0) ?
247 (double)dedup_ref_size
/ dedup_alloc_size
: 0);
254 hammer_cmd_dedup(char **av
, int ac
)
256 struct dedup_entry
*de
;
257 struct sha_dedup_entry
*sha_de
;
258 struct pass2_dedup_entry
*pass2_de
;
269 STAILQ_INIT(&pass2_dedup_queue
);
271 glob_fd
= getpfs(&glob_pfs
, av
[0]);
274 * A cycle file is _required_ for resuming dedup after the timeout
275 * specified with -t has expired. If no -c option, then place a
276 * .dedup.cycle file either in the PFS snapshots directory or in
277 * the default snapshots directory.
280 if (glob_pfs
.ondisk
->snapshots
[0] != '/')
281 asprintf(&tmp
, "%s/%s/.dedup.cycle",
282 SNAPSHOTS_BASE
, av
[0]);
284 asprintf(&tmp
, "%s/.dedup.cycle",
285 glob_pfs
.ondisk
->snapshots
);
291 * Pre-pass to cache the btree
293 scan_pfs(av
[0], count_btree_elm
, "pre-pass ");
294 DedupTotalRecords
= DedupCurrentRecords
;
297 * Collection passes (memory limited)
299 printf("Dedup running\n");
301 DedupCrcStart
= DedupCrcEnd
;
306 printf("B-Tree pass crc-range %08x-max\n",
310 scan_pfs(av
[0], process_btree_elm
, "main-pass");
312 while ((pass2_de
= STAILQ_FIRST(&pass2_dedup_queue
)) != NULL
) {
313 if (process_btree_elm(&pass2_de
->leaf
, DEDUP_PASS2
))
314 dedup_skipped_size
-= pass2_de
->leaf
.data_len
;
316 STAILQ_REMOVE_HEAD(&pass2_dedup_queue
, sq_entry
);
319 assert(STAILQ_EMPTY(&pass2_dedup_queue
));
325 * Calculate dedup ratio and get rid of the trees
327 while ((de
= RB_ROOT(&dedup_tree
)) != NULL
) {
328 if (de
->flags
& HAMMER_DEDUP_ENTRY_FICTITIOUS
) {
329 while ((sha_de
= RB_ROOT(&de
->u
.fict_root
)) != NULL
) {
330 assert(sha_de
->ref_blks
!= 0);
331 dedup_ref_size
+= sha_de
->ref_size
;
332 dedup_alloc_size
+= sha_de
->ref_size
/ sha_de
->ref_blks
;
334 RB_REMOVE(sha_dedup_entry_rb_tree
,
335 &de
->u
.fict_root
, sha_de
);
338 assert(RB_EMPTY(&de
->u
.fict_root
));
340 assert(de
->u
.de
.ref_blks
!= 0);
341 dedup_ref_size
+= de
->u
.de
.ref_size
;
342 dedup_alloc_size
+= de
->u
.de
.ref_size
/ de
->u
.de
.ref_blks
;
345 RB_REMOVE(dedup_entry_rb_tree
, &dedup_tree
, de
);
348 assert(RB_EMPTY(&dedup_tree
));
349 if (DedupCrcEnd
&& VerboseOpt
== 0)
351 } while (DedupCrcEnd
);
353 printf("Dedup %s succeeded\n", av
[0]);
354 relpfs(glob_fd
, &glob_pfs
);
356 humanize_unsigned(buf
, sizeof(buf
), dedup_ref_size
, "B", 1024);
357 printf("Dedup ratio = %.2f (in this run)\n"
359 ((dedup_alloc_size
!= 0) ?
360 (double)dedup_ref_size
/ dedup_alloc_size
: 0),
363 humanize_unsigned(buf
, sizeof(buf
), dedup_alloc_size
, "B", 1024);
364 printf(" %8s allocated\n", buf
);
365 humanize_unsigned(buf
, sizeof(buf
), dedup_skipped_size
, "B", 1024);
366 printf(" %8s skipped\n", buf
);
367 printf(" %8jd CRC collisions\n"
368 " %8jd SHA collisions\n"
369 " %8jd big-block underflows\n"
370 " %8jd new dedup records\n"
371 " %8jd new dedup bytes\n",
372 (intmax_t)dedup_crc_failures
,
373 (intmax_t)dedup_sha_failures
,
374 (intmax_t)dedup_underflows
,
375 (intmax_t)dedup_successes_count
,
376 (intmax_t)dedup_successes_bytes
379 /* Once completed remove cycle file */
380 hammer_reset_cycle();
382 /* We don't want to mess up with other directives */
390 count_btree_elm(hammer_btree_leaf_elm_t scan_leaf __unused
, int flags __unused
)
396 collect_btree_elm(hammer_btree_leaf_elm_t scan_leaf
, int flags __unused
)
398 struct sim_dedup_entry
*sim_de
;
401 * If we are using too much memory we have to clean some out, which
402 * will cause the run to use multiple passes. Be careful of integer
405 if (MemoryUse
> MemoryLimit
) {
406 DedupCrcEnd
= DedupCrcStart
+
407 (uint32_t)(DedupCrcEnd
- DedupCrcStart
- 1) / 2;
409 printf("memory limit crc-range %08x-%08x\n",
410 DedupCrcStart
, DedupCrcEnd
);
414 sim_de
= RB_MAX(sim_dedup_entry_rb_tree
,
416 if (sim_de
== NULL
|| sim_de
->crc
< DedupCrcEnd
)
418 RB_REMOVE(sim_dedup_entry_rb_tree
,
419 &sim_dedup_tree
, sim_de
);
420 MemoryUse
-= sizeof(*sim_de
);
426 * Collect statistics based on the CRC only, do not try to read
427 * any data blocks or run SHA hashes.
429 sim_de
= RB_LOOKUP(sim_dedup_entry_rb_tree
, &sim_dedup_tree
,
430 scan_leaf
->data_crc
);
432 if (sim_de
== NULL
) {
433 sim_de
= calloc(1, sizeof(*sim_de
));
434 sim_de
->crc
= scan_leaf
->data_crc
;
435 RB_INSERT(sim_dedup_entry_rb_tree
, &sim_dedup_tree
, sim_de
);
436 MemoryUse
+= sizeof(*sim_de
);
439 sim_de
->ref_blks
+= 1;
440 sim_de
->ref_size
+= scan_leaf
->data_len
;
445 validate_dedup_pair(hammer_btree_leaf_elm_t p
, hammer_btree_leaf_elm_t q
)
447 if (HAMMER_ZONE(p
->data_offset
) != HAMMER_ZONE(q
->data_offset
))
449 if (p
->data_len
!= q
->data_len
)
455 #define DEDUP_TECH_FAILURE 1
456 #define DEDUP_CMP_FAILURE 2
457 #define DEDUP_INVALID_ZONE 3
458 #define DEDUP_UNDERFLOW 4
459 #define DEDUP_VERS_FAILURE 5
462 deduplicate(hammer_btree_leaf_elm_t p
, hammer_btree_leaf_elm_t q
)
464 struct hammer_ioc_dedup dedup
;
466 bzero(&dedup
, sizeof(dedup
));
469 * If data_offset fields are the same there is no need to run ioctl,
470 * candidate is already dedup'ed.
472 if (p
->data_offset
== q
->data_offset
)
475 dedup
.elm1
= p
->base
;
476 dedup
.elm2
= q
->base
;
478 if (ioctl(glob_fd
, HAMMERIOC_DEDUP
, &dedup
) < 0) {
479 if (errno
== EOPNOTSUPP
)
480 return (DEDUP_VERS_FAILURE
); /* must be at least version 5 */
481 /* Technical failure - locking or w/e */
482 return (DEDUP_TECH_FAILURE
);
484 if (dedup
.head
.flags
& HAMMER_IOC_DEDUP_CMP_FAILURE
)
485 return (DEDUP_CMP_FAILURE
);
486 if (dedup
.head
.flags
& HAMMER_IOC_DEDUP_INVALID_ZONE
)
487 return (DEDUP_INVALID_ZONE
);
488 if (dedup
.head
.flags
& HAMMER_IOC_DEDUP_UNDERFLOW
)
489 return (DEDUP_UNDERFLOW
);
491 ++dedup_successes_count
;
492 dedup_successes_bytes
+= p
->data_len
;
497 process_btree_elm(hammer_btree_leaf_elm_t scan_leaf
, int flags
)
499 struct dedup_entry
*de
;
500 struct sha_dedup_entry
*sha_de
, temp
;
501 struct pass2_dedup_entry
*pass2_de
;
505 * If we are using too much memory we have to clean some out, which
506 * will cause the run to use multiple passes. Be careful of integer
509 while (MemoryUse
> MemoryLimit
) {
510 DedupCrcEnd
= DedupCrcStart
+
511 (uint32_t)(DedupCrcEnd
- DedupCrcStart
- 1) / 2;
513 printf("memory limit crc-range %08x-%08x\n",
514 DedupCrcStart
, DedupCrcEnd
);
519 de
= RB_MAX(dedup_entry_rb_tree
, &dedup_tree
);
520 if (de
== NULL
|| de
->leaf
.data_crc
< DedupCrcEnd
)
522 if (de
->flags
& HAMMER_DEDUP_ENTRY_FICTITIOUS
) {
523 while ((sha_de
= RB_ROOT(&de
->u
.fict_root
)) !=
525 RB_REMOVE(sha_dedup_entry_rb_tree
,
526 &de
->u
.fict_root
, sha_de
);
527 MemoryUse
-= sizeof(*sha_de
);
531 RB_REMOVE(dedup_entry_rb_tree
, &dedup_tree
, de
);
532 MemoryUse
-= sizeof(*de
);
538 * Collect statistics based on the CRC. Colliding CRCs usually
539 * cause a SHA sub-tree to be created under the de.
541 * Trivial case if de not found.
543 de
= RB_LOOKUP(dedup_entry_rb_tree
, &dedup_tree
, scan_leaf
->data_crc
);
545 de
= calloc(1, sizeof(*de
));
546 de
->leaf
= *scan_leaf
;
547 RB_INSERT(dedup_entry_rb_tree
, &dedup_tree
, de
);
548 MemoryUse
+= sizeof(*de
);
553 * Found entry in CRC tree
555 if (de
->flags
& HAMMER_DEDUP_ENTRY_FICTITIOUS
) {
557 * Optimize the case where a CRC failure results in multiple
558 * SHA entries. If we unconditionally issue a data-read a
559 * degenerate situation where a colliding CRC's second SHA
560 * entry contains the lion's share of the deduplication
561 * candidates will result in excessive data block reads.
563 * Deal with the degenerate case by looking for a matching
564 * data_offset/data_len in the SHA elements we already have
565 * before reading the data block and generating a new SHA.
567 RB_FOREACH(sha_de
, sha_dedup_entry_rb_tree
, &de
->u
.fict_root
) {
568 if (sha_de
->leaf
.data_offset
==
569 scan_leaf
->data_offset
&&
570 sha_de
->leaf
.data_len
== scan_leaf
->data_len
) {
571 memcpy(temp
.sha_hash
, sha_de
->sha_hash
,
572 SHA256_DIGEST_LENGTH
);
578 * Entry in CRC tree is fictitious, so we already had problems
579 * with this CRC. Upgrade (compute SHA) the candidate and
580 * dive into SHA subtree. If upgrade fails insert the candidate
581 * into Pass2 list (it will be processed later).
583 if (sha_de
== NULL
) {
584 if (upgrade_chksum(scan_leaf
, temp
.sha_hash
))
587 sha_de
= RB_FIND(sha_dedup_entry_rb_tree
,
588 &de
->u
.fict_root
, &temp
);
592 * Nothing in SHA subtree so far, so this is a new
593 * 'dataset'. Insert new entry into SHA subtree.
595 if (sha_de
== NULL
) {
596 sha_de
= calloc(1, sizeof(*sha_de
));
597 sha_de
->leaf
= *scan_leaf
;
598 memcpy(sha_de
->sha_hash
, temp
.sha_hash
,
599 SHA256_DIGEST_LENGTH
);
600 RB_INSERT(sha_dedup_entry_rb_tree
, &de
->u
.fict_root
,
602 MemoryUse
+= sizeof(*sha_de
);
603 goto upgrade_stats_sha
;
607 * Found entry in SHA subtree, it means we have a potential
608 * dedup pair. Validate it (zones have to match and data_len
609 * field have to be the same too. If validation fails, treat
610 * it as a SHA collision (jump to sha256_failure).
612 if (validate_dedup_pair(&sha_de
->leaf
, scan_leaf
))
616 * We have a valid dedup pair (SHA match, validated).
618 * In case of technical failure (dedup pair was good, but
619 * ioctl failed anyways) insert the candidate into Pass2 list
620 * (we will try to dedup it after we are done with the rest of
623 * If ioctl fails because either of blocks is in the non-dedup
624 * zone (we can dedup only in LARGE_DATA and SMALL_DATA) don't
625 * bother with the candidate and terminate early.
627 * If ioctl fails because of big-block underflow replace the
628 * leaf node that found dedup entry represents with scan_leaf.
630 error
= deduplicate(&sha_de
->leaf
, scan_leaf
);
633 goto upgrade_stats_sha
;
634 case DEDUP_TECH_FAILURE
:
636 case DEDUP_CMP_FAILURE
:
638 case DEDUP_INVALID_ZONE
:
639 goto terminate_early
;
640 case DEDUP_UNDERFLOW
:
642 sha_de
->leaf
= *scan_leaf
;
643 memcpy(sha_de
->sha_hash
, temp
.sha_hash
,
644 SHA256_DIGEST_LENGTH
);
645 goto upgrade_stats_sha
;
646 case DEDUP_VERS_FAILURE
:
647 errx(1, "HAMMER filesystem must be at least "
648 "version 5 to dedup");
650 fprintf(stderr
, "Unknown error\n");
651 goto terminate_early
;
655 * Ooh la la.. SHA-256 collision. Terminate early, there's
656 * nothing we can do here.
659 ++dedup_sha_failures
;
660 goto terminate_early
;
663 * Candidate CRC is good for now (we found an entry in CRC
664 * tree and it's not fictitious). This means we have a
665 * potential dedup pair.
667 if (validate_dedup_pair(&de
->leaf
, scan_leaf
))
671 * We have a valid dedup pair (CRC match, validated)
673 error
= deduplicate(&de
->leaf
, scan_leaf
);
677 case DEDUP_TECH_FAILURE
:
679 case DEDUP_CMP_FAILURE
:
681 case DEDUP_INVALID_ZONE
:
682 goto terminate_early
;
683 case DEDUP_UNDERFLOW
:
685 de
->leaf
= *scan_leaf
;
687 case DEDUP_VERS_FAILURE
:
688 errx(1, "HAMMER filesystem must be at least "
689 "version 5 to dedup");
691 fprintf(stderr
, "Unknown error\n");
692 goto terminate_early
;
697 * We got a CRC collision - either ioctl failed because of
698 * the comparison failure or validation of the potential
699 * dedup pair went bad. In all cases insert both blocks
700 * into SHA subtree (this requires checksum upgrade) and mark
701 * entry that corresponds to this CRC in the CRC tree
702 * fictitious, so that all futher operations with this CRC go
703 * through SHA subtree.
705 ++dedup_crc_failures
;
708 * Insert block that was represented by now fictitious dedup
709 * entry (create a new SHA entry and preserve stats of the
710 * old CRC one). If checksum upgrade fails insert the
711 * candidate into Pass2 list and return - keep both trees
714 sha_de
= calloc(1, sizeof(*sha_de
));
715 sha_de
->leaf
= de
->leaf
;
716 sha_de
->ref_blks
= de
->u
.de
.ref_blks
;
717 sha_de
->ref_size
= de
->u
.de
.ref_size
;
718 if (upgrade_chksum(&sha_de
->leaf
, sha_de
->sha_hash
)) {
722 MemoryUse
+= sizeof(*sha_de
);
724 RB_INIT(&de
->u
.fict_root
);
726 * Here we can insert without prior checking because the tree
727 * is empty at this point
729 RB_INSERT(sha_dedup_entry_rb_tree
, &de
->u
.fict_root
, sha_de
);
732 * Mark entry in CRC tree fictitious
734 de
->flags
|= HAMMER_DEDUP_ENTRY_FICTITIOUS
;
737 * Upgrade checksum of the candidate and insert it into
738 * SHA subtree. If upgrade fails insert the candidate into
741 if (upgrade_chksum(scan_leaf
, temp
.sha_hash
))
743 sha_de
= RB_FIND(sha_dedup_entry_rb_tree
, &de
->u
.fict_root
,
746 /* There is an entry with this SHA already, but the only
747 * RB-tree element at this point is that entry we just
748 * added. We know for sure these blocks are different
749 * (this is crc_failure branch) so treat it as SHA
754 sha_de
= calloc(1, sizeof(*sha_de
));
755 sha_de
->leaf
= *scan_leaf
;
756 memcpy(sha_de
->sha_hash
, temp
.sha_hash
, SHA256_DIGEST_LENGTH
);
757 RB_INSERT(sha_dedup_entry_rb_tree
, &de
->u
.fict_root
, sha_de
);
758 MemoryUse
+= sizeof(*sha_de
);
759 goto upgrade_stats_sha
;
763 de
->u
.de
.ref_blks
+= 1;
764 de
->u
.de
.ref_size
+= scan_leaf
->data_len
;
768 sha_de
->ref_blks
+= 1;
769 sha_de
->ref_size
+= scan_leaf
->data_len
;
774 * If in pass2 mode don't insert anything, fall through to
777 if ((flags
& DEDUP_PASS2
) == 0) {
778 pass2_de
= calloc(1, sizeof(*pass2_de
));
779 pass2_de
->leaf
= *scan_leaf
;
780 STAILQ_INSERT_TAIL(&pass2_dedup_queue
, pass2_de
, sq_entry
);
781 dedup_skipped_size
+= scan_leaf
->data_len
;
787 * Early termination path. Fixup stats.
789 dedup_alloc_size
+= scan_leaf
->data_len
;
790 dedup_ref_size
+= scan_leaf
->data_len
;
795 upgrade_chksum(hammer_btree_leaf_elm_t leaf
, uint8_t *sha_hash
)
797 struct hammer_ioc_data data
;
798 char *buf
= malloc(DEDUP_BUF
);
802 bzero(&data
, sizeof(data
));
803 data
.elm
= leaf
->base
;
805 data
.size
= DEDUP_BUF
;
808 if (ioctl(glob_fd
, HAMMERIOC_GET_DATA
, &data
) < 0) {
809 fprintf(stderr
, "Get-data failed: %s\n", strerror(errno
));
813 DedupDataReads
+= leaf
->data_len
;
815 if (data
.leaf
.data_len
!= leaf
->data_len
) {
820 if (data
.leaf
.base
.btype
== HAMMER_BTREE_TYPE_RECORD
&&
821 data
.leaf
.base
.rec_type
== HAMMER_RECTYPE_DATA
) {
823 SHA256_Update(&ctx
, (void *)buf
, data
.leaf
.data_len
);
824 SHA256_Final(sha_hash
, &ctx
);
833 sigAlrm(int signo __unused
)
839 sigInfo(int signo __unused
)
845 scan_pfs(char *filesystem
, scan_pfs_cb_t func
, const char *id
)
847 struct hammer_ioc_mirror_rw mirror
;
848 hammer_ioc_mrecord_any_t mrec
;
849 struct hammer_btree_leaf_elm elm
;
850 char *buf
= malloc(DEDUP_BUF
);
857 DedupCurrentRecords
= 0;
858 signal(SIGINFO
, sigInfo
);
859 signal(SIGALRM
, sigAlrm
);
862 * Deduplication happens per element so hammer(8) is in full
863 * control of the ioctl()s to actually perform it. SIGALRM
864 * needs to be handled within hammer(8) but a checkpoint
865 * is needed for resuming. Use cycle file for that.
867 * Try to obtain the previous obj_id from the cycle file and
868 * if not available just start from the beginning.
870 bzero(&mirror
, sizeof(mirror
));
871 hammer_key_beg_init(&mirror
.key_beg
);
872 hammer_get_cycle(&mirror
.key_beg
, &mirror
.tid_beg
);
874 if (mirror
.key_beg
.obj_id
!= (int64_t)HAMMER_MIN_OBJID
) {
876 fprintf(stderr
, "%s: mirror-read: Resuming at object %016jx\n",
877 id
, (uintmax_t)mirror
.key_beg
.obj_id
);
880 hammer_key_end_init(&mirror
.key_end
);
882 mirror
.tid_beg
= glob_pfs
.ondisk
->sync_beg_tid
;
883 mirror
.tid_end
= glob_pfs
.ondisk
->sync_end_tid
;
884 mirror
.head
.flags
|= HAMMER_IOC_MIRROR_NODATA
; /* we want only keys */
886 mirror
.size
= DEDUP_BUF
;
887 mirror
.pfs_id
= glob_pfs
.pfs_id
;
888 mirror
.shared_uuid
= glob_pfs
.ondisk
->shared_uuid
;
890 if (VerboseOpt
&& DedupCrcStart
== 0) {
891 printf("%s %s: objspace %016jx:%04x %016jx:%04x\n",
893 (uintmax_t)mirror
.key_beg
.obj_id
,
894 mirror
.key_beg
.localization
,
895 (uintmax_t)mirror
.key_end
.obj_id
,
896 mirror
.key_end
.localization
);
897 printf("%s %s: pfs_id %d\n",
898 id
, filesystem
, glob_pfs
.pfs_id
);
905 mirror
.pfs_id
= glob_pfs
.pfs_id
;
906 mirror
.shared_uuid
= glob_pfs
.ondisk
->shared_uuid
;
907 if (ioctl(glob_fd
, HAMMERIOC_MIRROR_READ
, &mirror
) < 0)
908 err(1, "Mirror-read %s failed", filesystem
);
909 if (mirror
.head
.flags
& HAMMER_IOC_HEAD_ERROR
)
910 errx(1, "Mirror-read %s fatal error %d",
911 filesystem
, mirror
.head
.error
);
914 while (offset
< mirror
.count
) {
915 mrec
= (void *)((char *)buf
+ offset
);
916 bytes
= HAMMER_HEAD_DOALIGN(mrec
->head
.rec_size
);
917 if (offset
+ bytes
> mirror
.count
)
918 errx(1, "Misaligned record");
919 assert((mrec
->head
.type
&
920 HAMMER_MRECF_TYPE_MASK
) ==
921 HAMMER_MREC_TYPE_REC
);
923 elm
= mrec
->rec
.leaf
;
924 if (elm
.base
.btype
!= HAMMER_BTREE_TYPE_RECORD
)
926 if (elm
.base
.rec_type
!= HAMMER_RECTYPE_DATA
)
928 ++DedupCurrentRecords
;
929 if (DedupCrcStart
!= DedupCrcEnd
) {
930 if (elm
.data_crc
< DedupCrcStart
)
933 elm
.data_crc
>= DedupCrcEnd
) {
940 mirror
.key_beg
= mirror
.key_cur
;
941 if (DidInterrupt
|| SigAlrmFlag
) {
943 fprintf(stderr
, "%s\n",
944 (DidInterrupt
? "Interrupted" : "Timeout"));
945 hammer_set_cycle(&mirror
.key_cur
, mirror
.tid_beg
);
947 fprintf(stderr
, "Cyclefile %s updated for "
948 "continuation\n", CyclePath
);
952 if (DedupTotalRecords
) {
953 humanize_unsigned(buf1
, sizeof(buf1
),
956 humanize_unsigned(buf2
, sizeof(buf2
),
957 dedup_successes_bytes
,
959 fprintf(stderr
, "%s count %7jd/%jd "
961 "ioread %s newddup %s\n",
963 (intmax_t)DedupCurrentRecords
,
964 (intmax_t)DedupTotalRecords
,
965 (int)(DedupCurrentRecords
* 100 /
967 (int)(DedupCurrentRecords
* 10000 /
968 DedupTotalRecords
% 100),
971 fprintf(stderr
, "%s count %-7jd\n",
973 (intmax_t)DedupCurrentRecords
);
977 } while (mirror
.count
!= 0);
979 signal(SIGINFO
, SIG_IGN
);
980 signal(SIGALRM
, SIG_IGN
);
986 dump_simulated_dedup(void)
988 struct sim_dedup_entry
*sim_de
;
990 printf("=== Dumping simulated dedup entries:\n");
991 RB_FOREACH(sim_de
, sim_dedup_entry_rb_tree
, &sim_dedup_tree
) {
992 printf("\tcrc=%08x cnt=%ju size=%ju\n",
994 (intmax_t)sim_de
->ref_blks
,
995 (intmax_t)sim_de
->ref_size
);
997 printf("end of dump ===\n");
1001 dump_real_dedup(void)
1003 struct dedup_entry
*de
;
1004 struct sha_dedup_entry
*sha_de
;
1007 printf("=== Dumping dedup entries:\n");
1008 RB_FOREACH(de
, dedup_entry_rb_tree
, &dedup_tree
) {
1009 if (de
->flags
& HAMMER_DEDUP_ENTRY_FICTITIOUS
) {
1010 printf("\tcrc=%08x fictitious\n", de
->leaf
.data_crc
);
1012 RB_FOREACH(sha_de
, sha_dedup_entry_rb_tree
, &de
->u
.fict_root
) {
1013 printf("\t\tcrc=%08x cnt=%ju size=%ju\n\t"
1015 sha_de
->leaf
.data_crc
,
1016 (intmax_t)sha_de
->ref_blks
,
1017 (intmax_t)sha_de
->ref_size
);
1018 for (i
= 0; i
< SHA256_DIGEST_LENGTH
; ++i
)
1019 printf("%02x", sha_de
->sha_hash
[i
]);
1023 printf("\tcrc=%08x cnt=%ju size=%ju\n",
1025 (intmax_t)de
->u
.de
.ref_blks
,
1026 (intmax_t)de
->u
.de
.ref_size
);
1029 printf("end of dump ===\n");
1033 dedup_usage(int code
)
1036 "hammer dedup-simulate <filesystem>\n"
1037 "hammer dedup <filesystem>\n"