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usb: xhci: Fix build warning seen with CONFIG_PM=n
[linux/fpc-iii.git] / drivers / md / dm-integrity.c
blobb225b3e445fa43aa57c51828f7f6bea09351fb0c
1 /*
2 * Copyright (C) 2016-2017 Red Hat, Inc. All rights reserved.
3 * Copyright (C) 2016-2017 Milan Broz
4 * Copyright (C) 2016-2017 Mikulas Patocka
5 *
6 * This file is released under the GPL.
7 */
8
9 #include <linux/compiler.h>
10 #include <linux/module.h>
11 #include <linux/device-mapper.h>
12 #include <linux/dm-io.h>
13 #include <linux/vmalloc.h>
14 #include <linux/sort.h>
15 #include <linux/rbtree.h>
16 #include <linux/delay.h>
17 #include <linux/random.h>
18 #include <linux/reboot.h>
19 #include <crypto/hash.h>
20 #include <crypto/skcipher.h>
21 #include <linux/async_tx.h>
22 #include <linux/dm-bufio.h>
23
24 #define DM_MSG_PREFIX "integrity"
25
26 #define DEFAULT_INTERLEAVE_SECTORS 32768
27 #define DEFAULT_JOURNAL_SIZE_FACTOR 7
28 #define DEFAULT_SECTORS_PER_BITMAP_BIT 32768
29 #define DEFAULT_BUFFER_SECTORS 128
30 #define DEFAULT_JOURNAL_WATERMARK 50
31 #define DEFAULT_SYNC_MSEC 10000
32 #define DEFAULT_MAX_JOURNAL_SECTORS 131072
33 #define MIN_LOG2_INTERLEAVE_SECTORS 3
34 #define MAX_LOG2_INTERLEAVE_SECTORS 31
35 #define METADATA_WORKQUEUE_MAX_ACTIVE 16
36 #define RECALC_SECTORS 8192
37 #define RECALC_WRITE_SUPER 16
38 #define BITMAP_BLOCK_SIZE 4096 /* don't change it */
39 #define BITMAP_FLUSH_INTERVAL (10 * HZ)
40
41 /*
42 * Warning - DEBUG_PRINT prints security-sensitive data to the log,
43 * so it should not be enabled in the official kernel
44 */
45 //#define DEBUG_PRINT
46 //#define INTERNAL_VERIFY
47
48 /*
49 * On disk structures
50 */
51
52 #define SB_MAGIC "integrt"
53 #define SB_VERSION_1 1
54 #define SB_VERSION_2 2
55 #define SB_VERSION_3 3
56 #define SB_VERSION_4 4
57 #define SB_SECTORS 8
58 #define MAX_SECTORS_PER_BLOCK 8
59
60 struct superblock {
61 __u8 magic[8];
62 __u8 version;
63 __u8 log2_interleave_sectors;
64 __u16 integrity_tag_size;
65 __u32 journal_sections;
66 __u64 provided_data_sectors; /* userspace uses this value */
67 __u32 flags;
68 __u8 log2_sectors_per_block;
69 __u8 log2_blocks_per_bitmap_bit;
70 __u8 pad[2];
71 __u64 recalc_sector;
72 };
73
74 #define SB_FLAG_HAVE_JOURNAL_MAC 0x1
75 #define SB_FLAG_RECALCULATING 0x2
76 #define SB_FLAG_DIRTY_BITMAP 0x4
77 #define SB_FLAG_FIXED_PADDING 0x8
78
79 #define JOURNAL_ENTRY_ROUNDUP 8
80
81 typedef __u64 commit_id_t;
82 #define JOURNAL_MAC_PER_SECTOR 8
83
84 struct journal_entry {
85 union {
86 struct {
87 __u32 sector_lo;
88 __u32 sector_hi;
89 } s;
90 __u64 sector;
91 } u;
92 commit_id_t last_bytes[0];
93 /* __u8 tag[0]; */
94 };
95
96 #define journal_entry_tag(ic, je) ((__u8 *)&(je)->last_bytes[(ic)->sectors_per_block])
97
98 #if BITS_PER_LONG == 64
99 #define journal_entry_set_sector(je, x) do { smp_wmb(); WRITE_ONCE((je)->u.sector, cpu_to_le64(x)); } while (0)
100 #else
101 #define journal_entry_set_sector(je, x) do { (je)->u.s.sector_lo = cpu_to_le32(x); smp_wmb(); WRITE_ONCE((je)->u.s.sector_hi, cpu_to_le32((x) >> 32)); } while (0)
102 #endif
103 #define journal_entry_get_sector(je) le64_to_cpu((je)->u.sector)
104 #define journal_entry_is_unused(je) ((je)->u.s.sector_hi == cpu_to_le32(-1))
105 #define journal_entry_set_unused(je) do { ((je)->u.s.sector_hi = cpu_to_le32(-1)); } while (0)
106 #define journal_entry_is_inprogress(je) ((je)->u.s.sector_hi == cpu_to_le32(-2))
107 #define journal_entry_set_inprogress(je) do { ((je)->u.s.sector_hi = cpu_to_le32(-2)); } while (0)
108
109 #define JOURNAL_BLOCK_SECTORS 8
110 #define JOURNAL_SECTOR_DATA ((1 << SECTOR_SHIFT) - sizeof(commit_id_t))
111 #define JOURNAL_MAC_SIZE (JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS)
112
113 struct journal_sector {
114 __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR];
115 __u8 mac[JOURNAL_MAC_PER_SECTOR];
116 commit_id_t commit_id;
117 };
118
119 #define MAX_TAG_SIZE (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
120
121 #define METADATA_PADDING_SECTORS 8
122
123 #define N_COMMIT_IDS 4
124
125 static unsigned char prev_commit_seq(unsigned char seq)
126 {
127 return (seq + N_COMMIT_IDS - 1) % N_COMMIT_IDS;
128 }
129
130 static unsigned char next_commit_seq(unsigned char seq)
131 {
132 return (seq + 1) % N_COMMIT_IDS;
133 }
134
135 /*
136 * In-memory structures
137 */
138
139 struct journal_node {
140 struct rb_node node;
141 sector_t sector;
142 };
143
144 struct alg_spec {
145 char *alg_string;
146 char *key_string;
147 __u8 *key;
148 unsigned key_size;
149 };
150
151 struct dm_integrity_c {
152 struct dm_dev *dev;
153 struct dm_dev *meta_dev;
154 unsigned tag_size;
155 __s8 log2_tag_size;
156 sector_t start;
157 mempool_t journal_io_mempool;
158 struct dm_io_client *io;
159 struct dm_bufio_client *bufio;
160 struct workqueue_struct *metadata_wq;
161 struct superblock *sb;
162 unsigned journal_pages;
163 unsigned n_bitmap_blocks;
164
165 struct page_list *journal;
166 struct page_list *journal_io;
167 struct page_list *journal_xor;
168 struct page_list *recalc_bitmap;
169 struct page_list *may_write_bitmap;
170 struct bitmap_block_status *bbs;
171 unsigned bitmap_flush_interval;
172 int synchronous_mode;
173 struct bio_list synchronous_bios;
174 struct delayed_work bitmap_flush_work;
175
176 struct crypto_skcipher *journal_crypt;
177 struct scatterlist **journal_scatterlist;
178 struct scatterlist **journal_io_scatterlist;
179 struct skcipher_request **sk_requests;
180
181 struct crypto_shash *journal_mac;
182
183 struct journal_node *journal_tree;
184 struct rb_root journal_tree_root;
185
186 sector_t provided_data_sectors;
187
188 unsigned short journal_entry_size;
189 unsigned char journal_entries_per_sector;
190 unsigned char journal_section_entries;
191 unsigned short journal_section_sectors;
192 unsigned journal_sections;
193 unsigned journal_entries;
194 sector_t data_device_sectors;
195 sector_t meta_device_sectors;
196 unsigned initial_sectors;
197 unsigned metadata_run;
198 __s8 log2_metadata_run;
199 __u8 log2_buffer_sectors;
200 __u8 sectors_per_block;
201 __u8 log2_blocks_per_bitmap_bit;
202
203 unsigned char mode;
204 int suspending;
205
206 int failed;
207
208 struct crypto_shash *internal_hash;
209
210 /* these variables are locked with endio_wait.lock */
211 struct rb_root in_progress;
212 struct list_head wait_list;
213 wait_queue_head_t endio_wait;
214 struct workqueue_struct *wait_wq;
215
216 unsigned char commit_seq;
217 commit_id_t commit_ids[N_COMMIT_IDS];
218
219 unsigned committed_section;
220 unsigned n_committed_sections;
221
222 unsigned uncommitted_section;
223 unsigned n_uncommitted_sections;
224
225 unsigned free_section;
226 unsigned char free_section_entry;
227 unsigned free_sectors;
228
229 unsigned free_sectors_threshold;
230
231 struct workqueue_struct *commit_wq;
232 struct work_struct commit_work;
233
234 struct workqueue_struct *writer_wq;
235 struct work_struct writer_work;
236
237 struct workqueue_struct *recalc_wq;
238 struct work_struct recalc_work;
239 u8 *recalc_buffer;
240 u8 *recalc_tags;
241
242 struct bio_list flush_bio_list;
243
244 unsigned long autocommit_jiffies;
245 struct timer_list autocommit_timer;
246 unsigned autocommit_msec;
247
248 wait_queue_head_t copy_to_journal_wait;
249
250 struct completion crypto_backoff;
251
252 bool journal_uptodate;
253 bool just_formatted;
254 bool recalculate_flag;
255 bool fix_padding;
256
257 struct alg_spec internal_hash_alg;
258 struct alg_spec journal_crypt_alg;
259 struct alg_spec journal_mac_alg;
260
261 atomic64_t number_of_mismatches;
262
263 struct notifier_block reboot_notifier;
264 };
265
266 struct dm_integrity_range {
267 sector_t logical_sector;
268 sector_t n_sectors;
269 bool waiting;
270 union {
271 struct rb_node node;
272 struct {
273 struct task_struct *task;
274 struct list_head wait_entry;
275 };
276 };
277 };
278
279 struct dm_integrity_io {
280 struct work_struct work;
281
282 struct dm_integrity_c *ic;
283 bool write;
284 bool fua;
285
286 struct dm_integrity_range range;
287
288 sector_t metadata_block;
289 unsigned metadata_offset;
290
291 atomic_t in_flight;
292 blk_status_t bi_status;
293
294 struct completion *completion;
295
296 struct gendisk *orig_bi_disk;
297 u8 orig_bi_partno;
298 bio_end_io_t *orig_bi_end_io;
299 struct bio_integrity_payload *orig_bi_integrity;
300 struct bvec_iter orig_bi_iter;
301 };
302
303 struct journal_completion {
304 struct dm_integrity_c *ic;
305 atomic_t in_flight;
306 struct completion comp;
307 };
308
309 struct journal_io {
310 struct dm_integrity_range range;
311 struct journal_completion *comp;
312 };
313
314 struct bitmap_block_status {
315 struct work_struct work;
316 struct dm_integrity_c *ic;
317 unsigned idx;
318 unsigned long *bitmap;
319 struct bio_list bio_queue;
320 spinlock_t bio_queue_lock;
321
322 };
323
324 static struct kmem_cache *journal_io_cache;
325
326 #define JOURNAL_IO_MEMPOOL 32
327
328 #ifdef DEBUG_PRINT
329 #define DEBUG_print(x, ...) printk(KERN_DEBUG x, ##__VA_ARGS__)
330 static void __DEBUG_bytes(__u8 *bytes, size_t len, const char *msg, ...)
331 {
332 va_list args;
333 va_start(args, msg);
334 vprintk(msg, args);
335 va_end(args);
336 if (len)
337 pr_cont(":");
338 while (len) {
339 pr_cont(" %02x", *bytes);
340 bytes++;
341 len--;
342 }
343 pr_cont("\n");
344 }
345 #define DEBUG_bytes(bytes, len, msg, ...) __DEBUG_bytes(bytes, len, KERN_DEBUG msg, ##__VA_ARGS__)
346 #else
347 #define DEBUG_print(x, ...) do { } while (0)
348 #define DEBUG_bytes(bytes, len, msg, ...) do { } while (0)
349 #endif
350
351 static void dm_integrity_prepare(struct request *rq)
352 {
353 }
354
355 static void dm_integrity_complete(struct request *rq, unsigned int nr_bytes)
356 {
357 }
358
359 /*
360 * DM Integrity profile, protection is performed layer above (dm-crypt)
361 */
362 static const struct blk_integrity_profile dm_integrity_profile = {
363 .name = "DM-DIF-EXT-TAG",
364 .generate_fn = NULL,
365 .verify_fn = NULL,
366 .prepare_fn = dm_integrity_prepare,
367 .complete_fn = dm_integrity_complete,
368 };
369
370 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map);
371 static void integrity_bio_wait(struct work_struct *w);
372 static void dm_integrity_dtr(struct dm_target *ti);
373
374 static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err)
375 {
376 if (err == -EILSEQ)
377 atomic64_inc(&ic->number_of_mismatches);
378 if (!cmpxchg(&ic->failed, 0, err))
379 DMERR("Error on %s: %d", msg, err);
380 }
381
382 static int dm_integrity_failed(struct dm_integrity_c *ic)
383 {
384 return READ_ONCE(ic->failed);
385 }
386
387 static commit_id_t dm_integrity_commit_id(struct dm_integrity_c *ic, unsigned i,
388 unsigned j, unsigned char seq)
389 {
390 /*
391 * Xor the number with section and sector, so that if a piece of
392 * journal is written at wrong place, it is detected.
393 */
394 return ic->commit_ids[seq] ^ cpu_to_le64(((__u64)i << 32) ^ j);
395 }
396
397 static void get_area_and_offset(struct dm_integrity_c *ic, sector_t data_sector,
398 sector_t *area, sector_t *offset)
399 {
400 if (!ic->meta_dev) {
401 __u8 log2_interleave_sectors = ic->sb->log2_interleave_sectors;
402 *area = data_sector >> log2_interleave_sectors;
403 *offset = (unsigned)data_sector & ((1U << log2_interleave_sectors) - 1);
404 } else {
405 *area = 0;
406 *offset = data_sector;
407 }
408 }
409
410 #define sector_to_block(ic, n) \
411 do { \
412 BUG_ON((n) & (unsigned)((ic)->sectors_per_block - 1)); \
413 (n) >>= (ic)->sb->log2_sectors_per_block; \
414 } while (0)
415
416 static __u64 get_metadata_sector_and_offset(struct dm_integrity_c *ic, sector_t area,
417 sector_t offset, unsigned *metadata_offset)
418 {
419 __u64 ms;
420 unsigned mo;
421
422 ms = area << ic->sb->log2_interleave_sectors;
423 if (likely(ic->log2_metadata_run >= 0))
424 ms += area << ic->log2_metadata_run;
425 else
426 ms += area * ic->metadata_run;
427 ms >>= ic->log2_buffer_sectors;
428
429 sector_to_block(ic, offset);
430
431 if (likely(ic->log2_tag_size >= 0)) {
432 ms += offset >> (SECTOR_SHIFT + ic->log2_buffer_sectors - ic->log2_tag_size);
433 mo = (offset << ic->log2_tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
434 } else {
435 ms += (__u64)offset * ic->tag_size >> (SECTOR_SHIFT + ic->log2_buffer_sectors);
436 mo = (offset * ic->tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
437 }
438 *metadata_offset = mo;
439 return ms;
440 }
441
442 static sector_t get_data_sector(struct dm_integrity_c *ic, sector_t area, sector_t offset)
443 {
444 sector_t result;
445
446 if (ic->meta_dev)
447 return offset;
448
449 result = area << ic->sb->log2_interleave_sectors;
450 if (likely(ic->log2_metadata_run >= 0))
451 result += (area + 1) << ic->log2_metadata_run;
452 else
453 result += (area + 1) * ic->metadata_run;
454
455 result += (sector_t)ic->initial_sectors + offset;
456 result += ic->start;
457
458 return result;
459 }
460
461 static void wraparound_section(struct dm_integrity_c *ic, unsigned *sec_ptr)
462 {
463 if (unlikely(*sec_ptr >= ic->journal_sections))
464 *sec_ptr -= ic->journal_sections;
465 }
466
467 static void sb_set_version(struct dm_integrity_c *ic)
468 {
469 if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING))
470 ic->sb->version = SB_VERSION_4;
471 else if (ic->mode == 'B' || ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP))
472 ic->sb->version = SB_VERSION_3;
473 else if (ic->meta_dev || ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
474 ic->sb->version = SB_VERSION_2;
475 else
476 ic->sb->version = SB_VERSION_1;
477 }
478
479 static int sync_rw_sb(struct dm_integrity_c *ic, int op, int op_flags)
480 {
481 struct dm_io_request io_req;
482 struct dm_io_region io_loc;
483
484 io_req.bi_op = op;
485 io_req.bi_op_flags = op_flags;
486 io_req.mem.type = DM_IO_KMEM;
487 io_req.mem.ptr.addr = ic->sb;
488 io_req.notify.fn = NULL;
489 io_req.client = ic->io;
490 io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
491 io_loc.sector = ic->start;
492 io_loc.count = SB_SECTORS;
493
494 if (op == REQ_OP_WRITE)
495 sb_set_version(ic);
496
497 return dm_io(&io_req, 1, &io_loc, NULL);
498 }
499
500 #define BITMAP_OP_TEST_ALL_SET 0
501 #define BITMAP_OP_TEST_ALL_CLEAR 1
502 #define BITMAP_OP_SET 2
503 #define BITMAP_OP_CLEAR 3
504
505 static bool block_bitmap_op(struct dm_integrity_c *ic, struct page_list *bitmap,
506 sector_t sector, sector_t n_sectors, int mode)
507 {
508 unsigned long bit, end_bit, this_end_bit, page, end_page;
509 unsigned long *data;
510
511 if (unlikely(((sector | n_sectors) & ((1 << ic->sb->log2_sectors_per_block) - 1)) != 0)) {
512 DMCRIT("invalid bitmap access (%llx,%llx,%d,%d,%d)",
513 (unsigned long long)sector,
514 (unsigned long long)n_sectors,
515 ic->sb->log2_sectors_per_block,
516 ic->log2_blocks_per_bitmap_bit,
517 mode);
518 BUG();
519 }
520
521 if (unlikely(!n_sectors))
522 return true;
523
524 bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
525 end_bit = (sector + n_sectors - 1) >>
526 (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
527
528 page = bit / (PAGE_SIZE * 8);
529 bit %= PAGE_SIZE * 8;
530
531 end_page = end_bit / (PAGE_SIZE * 8);
532 end_bit %= PAGE_SIZE * 8;
533
534 repeat:
535 if (page < end_page) {
536 this_end_bit = PAGE_SIZE * 8 - 1;
537 } else {
538 this_end_bit = end_bit;
539 }
540
541 data = lowmem_page_address(bitmap[page].page);
542
543 if (mode == BITMAP_OP_TEST_ALL_SET) {
544 while (bit <= this_end_bit) {
545 if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
546 do {
547 if (data[bit / BITS_PER_LONG] != -1)
548 return false;
549 bit += BITS_PER_LONG;
550 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
551 continue;
552 }
553 if (!test_bit(bit, data))
554 return false;
555 bit++;
556 }
557 } else if (mode == BITMAP_OP_TEST_ALL_CLEAR) {
558 while (bit <= this_end_bit) {
559 if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
560 do {
561 if (data[bit / BITS_PER_LONG] != 0)
562 return false;
563 bit += BITS_PER_LONG;
564 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
565 continue;
566 }
567 if (test_bit(bit, data))
568 return false;
569 bit++;
570 }
571 } else if (mode == BITMAP_OP_SET) {
572 while (bit <= this_end_bit) {
573 if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
574 do {
575 data[bit / BITS_PER_LONG] = -1;
576 bit += BITS_PER_LONG;
577 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
578 continue;
579 }
580 __set_bit(bit, data);
581 bit++;
582 }
583 } else if (mode == BITMAP_OP_CLEAR) {
584 if (!bit && this_end_bit == PAGE_SIZE * 8 - 1)
585 clear_page(data);
586 else while (bit <= this_end_bit) {
587 if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
588 do {
589 data[bit / BITS_PER_LONG] = 0;
590 bit += BITS_PER_LONG;
591 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
592 continue;
593 }
594 __clear_bit(bit, data);
595 bit++;
596 }
597 } else {
598 BUG();
599 }
600
601 if (unlikely(page < end_page)) {
602 bit = 0;
603 page++;
604 goto repeat;
605 }
606
607 return true;
608 }
609
610 static void block_bitmap_copy(struct dm_integrity_c *ic, struct page_list *dst, struct page_list *src)
611 {
612 unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
613 unsigned i;
614
615 for (i = 0; i < n_bitmap_pages; i++) {
616 unsigned long *dst_data = lowmem_page_address(dst[i].page);
617 unsigned long *src_data = lowmem_page_address(src[i].page);
618 copy_page(dst_data, src_data);
619 }
620 }
621
622 static struct bitmap_block_status *sector_to_bitmap_block(struct dm_integrity_c *ic, sector_t sector)
623 {
624 unsigned bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
625 unsigned bitmap_block = bit / (BITMAP_BLOCK_SIZE * 8);
626
627 BUG_ON(bitmap_block >= ic->n_bitmap_blocks);
628 return &ic->bbs[bitmap_block];
629 }
630
631 static void access_journal_check(struct dm_integrity_c *ic, unsigned section, unsigned offset,
632 bool e, const char *function)
633 {
634 #if defined(CONFIG_DM_DEBUG) || defined(INTERNAL_VERIFY)
635 unsigned limit = e ? ic->journal_section_entries : ic->journal_section_sectors;
636
637 if (unlikely(section >= ic->journal_sections) ||
638 unlikely(offset >= limit)) {
639 DMCRIT("%s: invalid access at (%u,%u), limit (%u,%u)",
640 function, section, offset, ic->journal_sections, limit);
641 BUG();
642 }
643 #endif
644 }
645
646 static void page_list_location(struct dm_integrity_c *ic, unsigned section, unsigned offset,
647 unsigned *pl_index, unsigned *pl_offset)
648 {
649 unsigned sector;
650
651 access_journal_check(ic, section, offset, false, "page_list_location");
652
653 sector = section * ic->journal_section_sectors + offset;
654
655 *pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
656 *pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
657 }
658
659 static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl,
660 unsigned section, unsigned offset, unsigned *n_sectors)
661 {
662 unsigned pl_index, pl_offset;
663 char *va;
664
665 page_list_location(ic, section, offset, &pl_index, &pl_offset);
666
667 if (n_sectors)
668 *n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT;
669
670 va = lowmem_page_address(pl[pl_index].page);
671
672 return (struct journal_sector *)(va + pl_offset);
673 }
674
675 static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset)
676 {
677 return access_page_list(ic, ic->journal, section, offset, NULL);
678 }
679
680 static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned section, unsigned n)
681 {
682 unsigned rel_sector, offset;
683 struct journal_sector *js;
684
685 access_journal_check(ic, section, n, true, "access_journal_entry");
686
687 rel_sector = n % JOURNAL_BLOCK_SECTORS;
688 offset = n / JOURNAL_BLOCK_SECTORS;
689
690 js = access_journal(ic, section, rel_sector);
691 return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size);
692 }
693
694 static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned section, unsigned n)
695 {
696 n <<= ic->sb->log2_sectors_per_block;
697
698 n += JOURNAL_BLOCK_SECTORS;
699
700 access_journal_check(ic, section, n, false, "access_journal_data");
701
702 return access_journal(ic, section, n);
703 }
704
705 static void section_mac(struct dm_integrity_c *ic, unsigned section, __u8 result[JOURNAL_MAC_SIZE])
706 {
707 SHASH_DESC_ON_STACK(desc, ic->journal_mac);
708 int r;
709 unsigned j, size;
710
711 desc->tfm = ic->journal_mac;
712
713 r = crypto_shash_init(desc);
714 if (unlikely(r)) {
715 dm_integrity_io_error(ic, "crypto_shash_init", r);
716 goto err;
717 }
718
719 for (j = 0; j < ic->journal_section_entries; j++) {
720 struct journal_entry *je = access_journal_entry(ic, section, j);
721 r = crypto_shash_update(desc, (__u8 *)&je->u.sector, sizeof je->u.sector);
722 if (unlikely(r)) {
723 dm_integrity_io_error(ic, "crypto_shash_update", r);
724 goto err;
725 }
726 }
727
728 size = crypto_shash_digestsize(ic->journal_mac);
729
730 if (likely(size <= JOURNAL_MAC_SIZE)) {
731 r = crypto_shash_final(desc, result);
732 if (unlikely(r)) {
733 dm_integrity_io_error(ic, "crypto_shash_final", r);
734 goto err;
735 }
736 memset(result + size, 0, JOURNAL_MAC_SIZE - size);
737 } else {
738 __u8 digest[HASH_MAX_DIGESTSIZE];
739
740 if (WARN_ON(size > sizeof(digest))) {
741 dm_integrity_io_error(ic, "digest_size", -EINVAL);
742 goto err;
743 }
744 r = crypto_shash_final(desc, digest);
745 if (unlikely(r)) {
746 dm_integrity_io_error(ic, "crypto_shash_final", r);
747 goto err;
748 }
749 memcpy(result, digest, JOURNAL_MAC_SIZE);
750 }
751
752 return;
753 err:
754 memset(result, 0, JOURNAL_MAC_SIZE);
755 }
756
757 static void rw_section_mac(struct dm_integrity_c *ic, unsigned section, bool wr)
758 {
759 __u8 result[JOURNAL_MAC_SIZE];
760 unsigned j;
761
762 if (!ic->journal_mac)
763 return;
764
765 section_mac(ic, section, result);
766
767 for (j = 0; j < JOURNAL_BLOCK_SECTORS; j++) {
768 struct journal_sector *js = access_journal(ic, section, j);
769
770 if (likely(wr))
771 memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR);
772 else {
773 if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR))
774 dm_integrity_io_error(ic, "journal mac", -EILSEQ);
775 }
776 }
777 }
778
779 static void complete_journal_op(void *context)
780 {
781 struct journal_completion *comp = context;
782 BUG_ON(!atomic_read(&comp->in_flight));
783 if (likely(atomic_dec_and_test(&comp->in_flight)))
784 complete(&comp->comp);
785 }
786
787 static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
788 unsigned n_sections, struct journal_completion *comp)
789 {
790 struct async_submit_ctl submit;
791 size_t n_bytes = (size_t)(n_sections * ic->journal_section_sectors) << SECTOR_SHIFT;
792 unsigned pl_index, pl_offset, section_index;
793 struct page_list *source_pl, *target_pl;
794
795 if (likely(encrypt)) {
796 source_pl = ic->journal;
797 target_pl = ic->journal_io;
798 } else {
799 source_pl = ic->journal_io;
800 target_pl = ic->journal;
801 }
802
803 page_list_location(ic, section, 0, &pl_index, &pl_offset);
804
805 atomic_add(roundup(pl_offset + n_bytes, PAGE_SIZE) >> PAGE_SHIFT, &comp->in_flight);
806
807 init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, complete_journal_op, comp, NULL);
808
809 section_index = pl_index;
810
811 do {
812 size_t this_step;
813 struct page *src_pages[2];
814 struct page *dst_page;
815
816 while (unlikely(pl_index == section_index)) {
817 unsigned dummy;
818 if (likely(encrypt))
819 rw_section_mac(ic, section, true);
820 section++;
821 n_sections--;
822 if (!n_sections)
823 break;
824 page_list_location(ic, section, 0, &section_index, &dummy);
825 }
826
827 this_step = min(n_bytes, (size_t)PAGE_SIZE - pl_offset);
828 dst_page = target_pl[pl_index].page;
829 src_pages[0] = source_pl[pl_index].page;
830 src_pages[1] = ic->journal_xor[pl_index].page;
831
832 async_xor(dst_page, src_pages, pl_offset, 2, this_step, &submit);
833
834 pl_index++;
835 pl_offset = 0;
836 n_bytes -= this_step;
837 } while (n_bytes);
838
839 BUG_ON(n_sections);
840
841 async_tx_issue_pending_all();
842 }
843
844 static void complete_journal_encrypt(struct crypto_async_request *req, int err)
845 {
846 struct journal_completion *comp = req->data;
847 if (unlikely(err)) {
848 if (likely(err == -EINPROGRESS)) {
849 complete(&comp->ic->crypto_backoff);
850 return;
851 }
852 dm_integrity_io_error(comp->ic, "asynchronous encrypt", err);
853 }
854 complete_journal_op(comp);
855 }
856
857 static bool do_crypt(bool encrypt, struct skcipher_request *req, struct journal_completion *comp)
858 {
859 int r;
860 skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
861 complete_journal_encrypt, comp);
862 if (likely(encrypt))
863 r = crypto_skcipher_encrypt(req);
864 else
865 r = crypto_skcipher_decrypt(req);
866 if (likely(!r))
867 return false;
868 if (likely(r == -EINPROGRESS))
869 return true;
870 if (likely(r == -EBUSY)) {
871 wait_for_completion(&comp->ic->crypto_backoff);
872 reinit_completion(&comp->ic->crypto_backoff);
873 return true;
874 }
875 dm_integrity_io_error(comp->ic, "encrypt", r);
876 return false;
877 }
878
879 static void crypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
880 unsigned n_sections, struct journal_completion *comp)
881 {
882 struct scatterlist **source_sg;
883 struct scatterlist **target_sg;
884
885 atomic_add(2, &comp->in_flight);
886
887 if (likely(encrypt)) {
888 source_sg = ic->journal_scatterlist;
889 target_sg = ic->journal_io_scatterlist;
890 } else {
891 source_sg = ic->journal_io_scatterlist;
892 target_sg = ic->journal_scatterlist;
893 }
894
895 do {
896 struct skcipher_request *req;
897 unsigned ivsize;
898 char *iv;
899
900 if (likely(encrypt))
901 rw_section_mac(ic, section, true);
902
903 req = ic->sk_requests[section];
904 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
905 iv = req->iv;
906
907 memcpy(iv, iv + ivsize, ivsize);
908
909 req->src = source_sg[section];
910 req->dst = target_sg[section];
911
912 if (unlikely(do_crypt(encrypt, req, comp)))
913 atomic_inc(&comp->in_flight);
914
915 section++;
916 n_sections--;
917 } while (n_sections);
918
919 atomic_dec(&comp->in_flight);
920 complete_journal_op(comp);
921 }
922
923 static void encrypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
924 unsigned n_sections, struct journal_completion *comp)
925 {
926 if (ic->journal_xor)
927 return xor_journal(ic, encrypt, section, n_sections, comp);
928 else
929 return crypt_journal(ic, encrypt, section, n_sections, comp);
930 }
931
932 static void complete_journal_io(unsigned long error, void *context)
933 {
934 struct journal_completion *comp = context;
935 if (unlikely(error != 0))
936 dm_integrity_io_error(comp->ic, "writing journal", -EIO);
937 complete_journal_op(comp);
938 }
939
940 static void rw_journal_sectors(struct dm_integrity_c *ic, int op, int op_flags,
941 unsigned sector, unsigned n_sectors, struct journal_completion *comp)
942 {
943 struct dm_io_request io_req;
944 struct dm_io_region io_loc;
945 unsigned pl_index, pl_offset;
946 int r;
947
948 if (unlikely(dm_integrity_failed(ic))) {
949 if (comp)
950 complete_journal_io(-1UL, comp);
951 return;
952 }
953
954 pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
955 pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
956
957 io_req.bi_op = op;
958 io_req.bi_op_flags = op_flags;
959 io_req.mem.type = DM_IO_PAGE_LIST;
960 if (ic->journal_io)
961 io_req.mem.ptr.pl = &ic->journal_io[pl_index];
962 else
963 io_req.mem.ptr.pl = &ic->journal[pl_index];
964 io_req.mem.offset = pl_offset;
965 if (likely(comp != NULL)) {
966 io_req.notify.fn = complete_journal_io;
967 io_req.notify.context = comp;
968 } else {
969 io_req.notify.fn = NULL;
970 }
971 io_req.client = ic->io;
972 io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
973 io_loc.sector = ic->start + SB_SECTORS + sector;
974 io_loc.count = n_sectors;
975
976 r = dm_io(&io_req, 1, &io_loc, NULL);
977 if (unlikely(r)) {
978 dm_integrity_io_error(ic, op == REQ_OP_READ ? "reading journal" : "writing journal", r);
979 if (comp) {
980 WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
981 complete_journal_io(-1UL, comp);
982 }
983 }
984 }
985
986 static void rw_journal(struct dm_integrity_c *ic, int op, int op_flags, unsigned section,
987 unsigned n_sections, struct journal_completion *comp)
988 {
989 unsigned sector, n_sectors;
990
991 sector = section * ic->journal_section_sectors;
992 n_sectors = n_sections * ic->journal_section_sectors;
993
994 rw_journal_sectors(ic, op, op_flags, sector, n_sectors, comp);
995 }
996
997 static void write_journal(struct dm_integrity_c *ic, unsigned commit_start, unsigned commit_sections)
998 {
999 struct journal_completion io_comp;
1000 struct journal_completion crypt_comp_1;
1001 struct journal_completion crypt_comp_2;
1002 unsigned i;
1003
1004 io_comp.ic = ic;
1005 init_completion(&io_comp.comp);
1006
1007 if (commit_start + commit_sections <= ic->journal_sections) {
1008 io_comp.in_flight = (atomic_t)ATOMIC_INIT(1);
1009 if (ic->journal_io) {
1010 crypt_comp_1.ic = ic;
1011 init_completion(&crypt_comp_1.comp);
1012 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1013 encrypt_journal(ic, true, commit_start, commit_sections, &crypt_comp_1);
1014 wait_for_completion_io(&crypt_comp_1.comp);
1015 } else {
1016 for (i = 0; i < commit_sections; i++)
1017 rw_section_mac(ic, commit_start + i, true);
1018 }
1019 rw_journal(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, commit_start,
1020 commit_sections, &io_comp);
1021 } else {
1022 unsigned to_end;
1023 io_comp.in_flight = (atomic_t)ATOMIC_INIT(2);
1024 to_end = ic->journal_sections - commit_start;
1025 if (ic->journal_io) {
1026 crypt_comp_1.ic = ic;
1027 init_completion(&crypt_comp_1.comp);
1028 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1029 encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1);
1030 if (try_wait_for_completion(&crypt_comp_1.comp)) {
1031 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1032 reinit_completion(&crypt_comp_1.comp);
1033 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1034 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1);
1035 wait_for_completion_io(&crypt_comp_1.comp);
1036 } else {
1037 crypt_comp_2.ic = ic;
1038 init_completion(&crypt_comp_2.comp);
1039 crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0);
1040 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2);
1041 wait_for_completion_io(&crypt_comp_1.comp);
1042 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1043 wait_for_completion_io(&crypt_comp_2.comp);
1044 }
1045 } else {
1046 for (i = 0; i < to_end; i++)
1047 rw_section_mac(ic, commit_start + i, true);
1048 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1049 for (i = 0; i < commit_sections - to_end; i++)
1050 rw_section_mac(ic, i, true);
1051 }
1052 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, 0, commit_sections - to_end, &io_comp);
1053 }
1054
1055 wait_for_completion_io(&io_comp.comp);
1056 }
1057
1058 static void copy_from_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset,
1059 unsigned n_sectors, sector_t target, io_notify_fn fn, void *data)
1060 {
1061 struct dm_io_request io_req;
1062 struct dm_io_region io_loc;
1063 int r;
1064 unsigned sector, pl_index, pl_offset;
1065
1066 BUG_ON((target | n_sectors | offset) & (unsigned)(ic->sectors_per_block - 1));
1067
1068 if (unlikely(dm_integrity_failed(ic))) {
1069 fn(-1UL, data);
1070 return;
1071 }
1072
1073 sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset;
1074
1075 pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
1076 pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
1077
1078 io_req.bi_op = REQ_OP_WRITE;
1079 io_req.bi_op_flags = 0;
1080 io_req.mem.type = DM_IO_PAGE_LIST;
1081 io_req.mem.ptr.pl = &ic->journal[pl_index];
1082 io_req.mem.offset = pl_offset;
1083 io_req.notify.fn = fn;
1084 io_req.notify.context = data;
1085 io_req.client = ic->io;
1086 io_loc.bdev = ic->dev->bdev;
1087 io_loc.sector = target;
1088 io_loc.count = n_sectors;
1089
1090 r = dm_io(&io_req, 1, &io_loc, NULL);
1091 if (unlikely(r)) {
1092 WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
1093 fn(-1UL, data);
1094 }
1095 }
1096
1097 static bool ranges_overlap(struct dm_integrity_range *range1, struct dm_integrity_range *range2)
1098 {
1099 return range1->logical_sector < range2->logical_sector + range2->n_sectors &&
1100 range1->logical_sector + range1->n_sectors > range2->logical_sector;
1101 }
1102
1103 static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range, bool check_waiting)
1104 {
1105 struct rb_node **n = &ic->in_progress.rb_node;
1106 struct rb_node *parent;
1107
1108 BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned)(ic->sectors_per_block - 1));
1109
1110 if (likely(check_waiting)) {
1111 struct dm_integrity_range *range;
1112 list_for_each_entry(range, &ic->wait_list, wait_entry) {
1113 if (unlikely(ranges_overlap(range, new_range)))
1114 return false;
1115 }
1116 }
1117
1118 parent = NULL;
1119
1120 while (*n) {
1121 struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node);
1122
1123 parent = *n;
1124 if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector) {
1125 n = &range->node.rb_left;
1126 } else if (new_range->logical_sector >= range->logical_sector + range->n_sectors) {
1127 n = &range->node.rb_right;
1128 } else {
1129 return false;
1130 }
1131 }
1132
1133 rb_link_node(&new_range->node, parent, n);
1134 rb_insert_color(&new_range->node, &ic->in_progress);
1135
1136 return true;
1137 }
1138
1139 static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1140 {
1141 rb_erase(&range->node, &ic->in_progress);
1142 while (unlikely(!list_empty(&ic->wait_list))) {
1143 struct dm_integrity_range *last_range =
1144 list_first_entry(&ic->wait_list, struct dm_integrity_range, wait_entry);
1145 struct task_struct *last_range_task;
1146 last_range_task = last_range->task;
1147 list_del(&last_range->wait_entry);
1148 if (!add_new_range(ic, last_range, false)) {
1149 last_range->task = last_range_task;
1150 list_add(&last_range->wait_entry, &ic->wait_list);
1151 break;
1152 }
1153 last_range->waiting = false;
1154 wake_up_process(last_range_task);
1155 }
1156 }
1157
1158 static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1159 {
1160 unsigned long flags;
1161
1162 spin_lock_irqsave(&ic->endio_wait.lock, flags);
1163 remove_range_unlocked(ic, range);
1164 spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1165 }
1166
1167 static void wait_and_add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1168 {
1169 new_range->waiting = true;
1170 list_add_tail(&new_range->wait_entry, &ic->wait_list);
1171 new_range->task = current;
1172 do {
1173 __set_current_state(TASK_UNINTERRUPTIBLE);
1174 spin_unlock_irq(&ic->endio_wait.lock);
1175 io_schedule();
1176 spin_lock_irq(&ic->endio_wait.lock);
1177 } while (unlikely(new_range->waiting));
1178 }
1179
1180 static void add_new_range_and_wait(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1181 {
1182 if (unlikely(!add_new_range(ic, new_range, true)))
1183 wait_and_add_new_range(ic, new_range);
1184 }
1185
1186 static void init_journal_node(struct journal_node *node)
1187 {
1188 RB_CLEAR_NODE(&node->node);
1189 node->sector = (sector_t)-1;
1190 }
1191
1192 static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector)
1193 {
1194 struct rb_node **link;
1195 struct rb_node *parent;
1196
1197 node->sector = sector;
1198 BUG_ON(!RB_EMPTY_NODE(&node->node));
1199
1200 link = &ic->journal_tree_root.rb_node;
1201 parent = NULL;
1202
1203 while (*link) {
1204 struct journal_node *j;
1205 parent = *link;
1206 j = container_of(parent, struct journal_node, node);
1207 if (sector < j->sector)
1208 link = &j->node.rb_left;
1209 else
1210 link = &j->node.rb_right;
1211 }
1212
1213 rb_link_node(&node->node, parent, link);
1214 rb_insert_color(&node->node, &ic->journal_tree_root);
1215 }
1216
1217 static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node)
1218 {
1219 BUG_ON(RB_EMPTY_NODE(&node->node));
1220 rb_erase(&node->node, &ic->journal_tree_root);
1221 init_journal_node(node);
1222 }
1223
1224 #define NOT_FOUND (-1U)
1225
1226 static unsigned find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector)
1227 {
1228 struct rb_node *n = ic->journal_tree_root.rb_node;
1229 unsigned found = NOT_FOUND;
1230 *next_sector = (sector_t)-1;
1231 while (n) {
1232 struct journal_node *j = container_of(n, struct journal_node, node);
1233 if (sector == j->sector) {
1234 found = j - ic->journal_tree;
1235 }
1236 if (sector < j->sector) {
1237 *next_sector = j->sector;
1238 n = j->node.rb_left;
1239 } else {
1240 n = j->node.rb_right;
1241 }
1242 }
1243
1244 return found;
1245 }
1246
1247 static bool test_journal_node(struct dm_integrity_c *ic, unsigned pos, sector_t sector)
1248 {
1249 struct journal_node *node, *next_node;
1250 struct rb_node *next;
1251
1252 if (unlikely(pos >= ic->journal_entries))
1253 return false;
1254 node = &ic->journal_tree[pos];
1255 if (unlikely(RB_EMPTY_NODE(&node->node)))
1256 return false;
1257 if (unlikely(node->sector != sector))
1258 return false;
1259
1260 next = rb_next(&node->node);
1261 if (unlikely(!next))
1262 return true;
1263
1264 next_node = container_of(next, struct journal_node, node);
1265 return next_node->sector != sector;
1266 }
1267
1268 static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node)
1269 {
1270 struct rb_node *next;
1271 struct journal_node *next_node;
1272 unsigned next_section;
1273
1274 BUG_ON(RB_EMPTY_NODE(&node->node));
1275
1276 next = rb_next(&node->node);
1277 if (unlikely(!next))
1278 return false;
1279
1280 next_node = container_of(next, struct journal_node, node);
1281
1282 if (next_node->sector != node->sector)
1283 return false;
1284
1285 next_section = (unsigned)(next_node - ic->journal_tree) / ic->journal_section_entries;
1286 if (next_section >= ic->committed_section &&
1287 next_section < ic->committed_section + ic->n_committed_sections)
1288 return true;
1289 if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections)
1290 return true;
1291
1292 return false;
1293 }
1294
1295 #define TAG_READ 0
1296 #define TAG_WRITE 1
1297 #define TAG_CMP 2
1298
1299 static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block,
1300 unsigned *metadata_offset, unsigned total_size, int op)
1301 {
1302 do {
1303 unsigned char *data, *dp;
1304 struct dm_buffer *b;
1305 unsigned to_copy;
1306 int r;
1307
1308 r = dm_integrity_failed(ic);
1309 if (unlikely(r))
1310 return r;
1311
1312 data = dm_bufio_read(ic->bufio, *metadata_block, &b);
1313 if (IS_ERR(data))
1314 return PTR_ERR(data);
1315
1316 to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size);
1317 dp = data + *metadata_offset;
1318 if (op == TAG_READ) {
1319 memcpy(tag, dp, to_copy);
1320 } else if (op == TAG_WRITE) {
1321 memcpy(dp, tag, to_copy);
1322 dm_bufio_mark_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy);
1323 } else {
1324 /* e.g.: op == TAG_CMP */
1325 if (unlikely(memcmp(dp, tag, to_copy))) {
1326 unsigned i;
1327
1328 for (i = 0; i < to_copy; i++) {
1329 if (dp[i] != tag[i])
1330 break;
1331 total_size--;
1332 }
1333 dm_bufio_release(b);
1334 return total_size;
1335 }
1336 }
1337 dm_bufio_release(b);
1338
1339 tag += to_copy;
1340 *metadata_offset += to_copy;
1341 if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) {
1342 (*metadata_block)++;
1343 *metadata_offset = 0;
1344 }
1345 total_size -= to_copy;
1346 } while (unlikely(total_size));
1347
1348 return 0;
1349 }
1350
1351 static void dm_integrity_flush_buffers(struct dm_integrity_c *ic)
1352 {
1353 int r;
1354 r = dm_bufio_write_dirty_buffers(ic->bufio);
1355 if (unlikely(r))
1356 dm_integrity_io_error(ic, "writing tags", r);
1357 }
1358
1359 static void sleep_on_endio_wait(struct dm_integrity_c *ic)
1360 {
1361 DECLARE_WAITQUEUE(wait, current);
1362 __add_wait_queue(&ic->endio_wait, &wait);
1363 __set_current_state(TASK_UNINTERRUPTIBLE);
1364 spin_unlock_irq(&ic->endio_wait.lock);
1365 io_schedule();
1366 spin_lock_irq(&ic->endio_wait.lock);
1367 __remove_wait_queue(&ic->endio_wait, &wait);
1368 }
1369
1370 static void autocommit_fn(struct timer_list *t)
1371 {
1372 struct dm_integrity_c *ic = from_timer(ic, t, autocommit_timer);
1373
1374 if (likely(!dm_integrity_failed(ic)))
1375 queue_work(ic->commit_wq, &ic->commit_work);
1376 }
1377
1378 static void schedule_autocommit(struct dm_integrity_c *ic)
1379 {
1380 if (!timer_pending(&ic->autocommit_timer))
1381 mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies);
1382 }
1383
1384 static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1385 {
1386 struct bio *bio;
1387 unsigned long flags;
1388
1389 spin_lock_irqsave(&ic->endio_wait.lock, flags);
1390 bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1391 bio_list_add(&ic->flush_bio_list, bio);
1392 spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1393
1394 queue_work(ic->commit_wq, &ic->commit_work);
1395 }
1396
1397 static void do_endio(struct dm_integrity_c *ic, struct bio *bio)
1398 {
1399 int r = dm_integrity_failed(ic);
1400 if (unlikely(r) && !bio->bi_status)
1401 bio->bi_status = errno_to_blk_status(r);
1402 if (unlikely(ic->synchronous_mode) && bio_op(bio) == REQ_OP_WRITE) {
1403 unsigned long flags;
1404 spin_lock_irqsave(&ic->endio_wait.lock, flags);
1405 bio_list_add(&ic->synchronous_bios, bio);
1406 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
1407 spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1408 return;
1409 }
1410 bio_endio(bio);
1411 }
1412
1413 static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1414 {
1415 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1416
1417 if (unlikely(dio->fua) && likely(!bio->bi_status) && likely(!dm_integrity_failed(ic)))
1418 submit_flush_bio(ic, dio);
1419 else
1420 do_endio(ic, bio);
1421 }
1422
1423 static void dec_in_flight(struct dm_integrity_io *dio)
1424 {
1425 if (atomic_dec_and_test(&dio->in_flight)) {
1426 struct dm_integrity_c *ic = dio->ic;
1427 struct bio *bio;
1428
1429 remove_range(ic, &dio->range);
1430
1431 if (unlikely(dio->write))
1432 schedule_autocommit(ic);
1433
1434 bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1435
1436 if (unlikely(dio->bi_status) && !bio->bi_status)
1437 bio->bi_status = dio->bi_status;
1438 if (likely(!bio->bi_status) && unlikely(bio_sectors(bio) != dio->range.n_sectors)) {
1439 dio->range.logical_sector += dio->range.n_sectors;
1440 bio_advance(bio, dio->range.n_sectors << SECTOR_SHIFT);
1441 INIT_WORK(&dio->work, integrity_bio_wait);
1442 queue_work(ic->wait_wq, &dio->work);
1443 return;
1444 }
1445 do_endio_flush(ic, dio);
1446 }
1447 }
1448
1449 static void integrity_end_io(struct bio *bio)
1450 {
1451 struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1452
1453 bio->bi_iter = dio->orig_bi_iter;
1454 bio->bi_disk = dio->orig_bi_disk;
1455 bio->bi_partno = dio->orig_bi_partno;
1456 if (dio->orig_bi_integrity) {
1457 bio->bi_integrity = dio->orig_bi_integrity;
1458 bio->bi_opf |= REQ_INTEGRITY;
1459 }
1460 bio->bi_end_io = dio->orig_bi_end_io;
1461
1462 if (dio->completion)
1463 complete(dio->completion);
1464
1465 dec_in_flight(dio);
1466 }
1467
1468 static void integrity_sector_checksum(struct dm_integrity_c *ic, sector_t sector,
1469 const char *data, char *result)
1470 {
1471 __u64 sector_le = cpu_to_le64(sector);
1472 SHASH_DESC_ON_STACK(req, ic->internal_hash);
1473 int r;
1474 unsigned digest_size;
1475
1476 req->tfm = ic->internal_hash;
1477
1478 r = crypto_shash_init(req);
1479 if (unlikely(r < 0)) {
1480 dm_integrity_io_error(ic, "crypto_shash_init", r);
1481 goto failed;
1482 }
1483
1484 r = crypto_shash_update(req, (const __u8 *)&sector_le, sizeof sector_le);
1485 if (unlikely(r < 0)) {
1486 dm_integrity_io_error(ic, "crypto_shash_update", r);
1487 goto failed;
1488 }
1489
1490 r = crypto_shash_update(req, data, ic->sectors_per_block << SECTOR_SHIFT);
1491 if (unlikely(r < 0)) {
1492 dm_integrity_io_error(ic, "crypto_shash_update", r);
1493 goto failed;
1494 }
1495
1496 r = crypto_shash_final(req, result);
1497 if (unlikely(r < 0)) {
1498 dm_integrity_io_error(ic, "crypto_shash_final", r);
1499 goto failed;
1500 }
1501
1502 digest_size = crypto_shash_digestsize(ic->internal_hash);
1503 if (unlikely(digest_size < ic->tag_size))
1504 memset(result + digest_size, 0, ic->tag_size - digest_size);
1505
1506 return;
1507
1508 failed:
1509 /* this shouldn't happen anyway, the hash functions have no reason to fail */
1510 get_random_bytes(result, ic->tag_size);
1511 }
1512
1513 static void integrity_metadata(struct work_struct *w)
1514 {
1515 struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
1516 struct dm_integrity_c *ic = dio->ic;
1517
1518 int r;
1519
1520 if (ic->internal_hash) {
1521 struct bvec_iter iter;
1522 struct bio_vec bv;
1523 unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1524 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1525 char *checksums;
1526 unsigned extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0;
1527 char checksums_onstack[HASH_MAX_DIGESTSIZE];
1528 unsigned sectors_to_process = dio->range.n_sectors;
1529 sector_t sector = dio->range.logical_sector;
1530
1531 if (unlikely(ic->mode == 'R'))
1532 goto skip_io;
1533
1534 checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT >> ic->sb->log2_sectors_per_block) * ic->tag_size + extra_space,
1535 GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
1536 if (!checksums) {
1537 checksums = checksums_onstack;
1538 if (WARN_ON(extra_space &&
1539 digest_size > sizeof(checksums_onstack))) {
1540 r = -EINVAL;
1541 goto error;
1542 }
1543 }
1544
1545 __bio_for_each_segment(bv, bio, iter, dio->orig_bi_iter) {
1546 unsigned pos;
1547 char *mem, *checksums_ptr;
1548
1549 again:
1550 mem = (char *)kmap_atomic(bv.bv_page) + bv.bv_offset;
1551 pos = 0;
1552 checksums_ptr = checksums;
1553 do {
1554 integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr);
1555 checksums_ptr += ic->tag_size;
1556 sectors_to_process -= ic->sectors_per_block;
1557 pos += ic->sectors_per_block << SECTOR_SHIFT;
1558 sector += ic->sectors_per_block;
1559 } while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
1560 kunmap_atomic(mem);
1561
1562 r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1563 checksums_ptr - checksums, !dio->write ? TAG_CMP : TAG_WRITE);
1564 if (unlikely(r)) {
1565 if (r > 0) {
1566 DMERR_LIMIT("Checksum failed at sector 0x%llx",
1567 (unsigned long long)(sector - ((r + ic->tag_size - 1) / ic->tag_size)));
1568 r = -EILSEQ;
1569 atomic64_inc(&ic->number_of_mismatches);
1570 }
1571 if (likely(checksums != checksums_onstack))
1572 kfree(checksums);
1573 goto error;
1574 }
1575
1576 if (!sectors_to_process)
1577 break;
1578
1579 if (unlikely(pos < bv.bv_len)) {
1580 bv.bv_offset += pos;
1581 bv.bv_len -= pos;
1582 goto again;
1583 }
1584 }
1585
1586 if (likely(checksums != checksums_onstack))
1587 kfree(checksums);
1588 } else {
1589 struct bio_integrity_payload *bip = dio->orig_bi_integrity;
1590
1591 if (bip) {
1592 struct bio_vec biv;
1593 struct bvec_iter iter;
1594 unsigned data_to_process = dio->range.n_sectors;
1595 sector_to_block(ic, data_to_process);
1596 data_to_process *= ic->tag_size;
1597
1598 bip_for_each_vec(biv, bip, iter) {
1599 unsigned char *tag;
1600 unsigned this_len;
1601
1602 BUG_ON(PageHighMem(biv.bv_page));
1603 tag = lowmem_page_address(biv.bv_page) + biv.bv_offset;
1604 this_len = min(biv.bv_len, data_to_process);
1605 r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset,
1606 this_len, !dio->write ? TAG_READ : TAG_WRITE);
1607 if (unlikely(r))
1608 goto error;
1609 data_to_process -= this_len;
1610 if (!data_to_process)
1611 break;
1612 }
1613 }
1614 }
1615 skip_io:
1616 dec_in_flight(dio);
1617 return;
1618 error:
1619 dio->bi_status = errno_to_blk_status(r);
1620 dec_in_flight(dio);
1621 }
1622
1623 static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
1624 {
1625 struct dm_integrity_c *ic = ti->private;
1626 struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1627 struct bio_integrity_payload *bip;
1628
1629 sector_t area, offset;
1630
1631 dio->ic = ic;
1632 dio->bi_status = 0;
1633
1634 if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
1635 submit_flush_bio(ic, dio);
1636 return DM_MAPIO_SUBMITTED;
1637 }
1638
1639 dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector);
1640 dio->write = bio_op(bio) == REQ_OP_WRITE;
1641 dio->fua = dio->write && bio->bi_opf & REQ_FUA;
1642 if (unlikely(dio->fua)) {
1643 /*
1644 * Don't pass down the FUA flag because we have to flush
1645 * disk cache anyway.
1646 */
1647 bio->bi_opf &= ~REQ_FUA;
1648 }
1649 if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) {
1650 DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx",
1651 (unsigned long long)dio->range.logical_sector, bio_sectors(bio),
1652 (unsigned long long)ic->provided_data_sectors);
1653 return DM_MAPIO_KILL;
1654 }
1655 if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned)(ic->sectors_per_block - 1))) {
1656 DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x",
1657 ic->sectors_per_block,
1658 (unsigned long long)dio->range.logical_sector, bio_sectors(bio));
1659 return DM_MAPIO_KILL;
1660 }
1661
1662 if (ic->sectors_per_block > 1) {
1663 struct bvec_iter iter;
1664 struct bio_vec bv;
1665 bio_for_each_segment(bv, bio, iter) {
1666 if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
1667 DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
1668 bv.bv_offset, bv.bv_len, ic->sectors_per_block);
1669 return DM_MAPIO_KILL;
1670 }
1671 }
1672 }
1673
1674 bip = bio_integrity(bio);
1675 if (!ic->internal_hash) {
1676 if (bip) {
1677 unsigned wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block;
1678 if (ic->log2_tag_size >= 0)
1679 wanted_tag_size <<= ic->log2_tag_size;
1680 else
1681 wanted_tag_size *= ic->tag_size;
1682 if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) {
1683 DMERR("Invalid integrity data size %u, expected %u",
1684 bip->bip_iter.bi_size, wanted_tag_size);
1685 return DM_MAPIO_KILL;
1686 }
1687 }
1688 } else {
1689 if (unlikely(bip != NULL)) {
1690 DMERR("Unexpected integrity data when using internal hash");
1691 return DM_MAPIO_KILL;
1692 }
1693 }
1694
1695 if (unlikely(ic->mode == 'R') && unlikely(dio->write))
1696 return DM_MAPIO_KILL;
1697
1698 get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1699 dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1700 bio->bi_iter.bi_sector = get_data_sector(ic, area, offset);
1701
1702 dm_integrity_map_continue(dio, true);
1703 return DM_MAPIO_SUBMITTED;
1704 }
1705
1706 static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
1707 unsigned journal_section, unsigned journal_entry)
1708 {
1709 struct dm_integrity_c *ic = dio->ic;
1710 sector_t logical_sector;
1711 unsigned n_sectors;
1712
1713 logical_sector = dio->range.logical_sector;
1714 n_sectors = dio->range.n_sectors;
1715 do {
1716 struct bio_vec bv = bio_iovec(bio);
1717 char *mem;
1718
1719 if (unlikely(bv.bv_len >> SECTOR_SHIFT > n_sectors))
1720 bv.bv_len = n_sectors << SECTOR_SHIFT;
1721 n_sectors -= bv.bv_len >> SECTOR_SHIFT;
1722 bio_advance_iter(bio, &bio->bi_iter, bv.bv_len);
1723 retry_kmap:
1724 mem = kmap_atomic(bv.bv_page);
1725 if (likely(dio->write))
1726 flush_dcache_page(bv.bv_page);
1727
1728 do {
1729 struct journal_entry *je = access_journal_entry(ic, journal_section, journal_entry);
1730
1731 if (unlikely(!dio->write)) {
1732 struct journal_sector *js;
1733 char *mem_ptr;
1734 unsigned s;
1735
1736 if (unlikely(journal_entry_is_inprogress(je))) {
1737 flush_dcache_page(bv.bv_page);
1738 kunmap_atomic(mem);
1739
1740 __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
1741 goto retry_kmap;
1742 }
1743 smp_rmb();
1744 BUG_ON(journal_entry_get_sector(je) != logical_sector);
1745 js = access_journal_data(ic, journal_section, journal_entry);
1746 mem_ptr = mem + bv.bv_offset;
1747 s = 0;
1748 do {
1749 memcpy(mem_ptr, js, JOURNAL_SECTOR_DATA);
1750 *(commit_id_t *)(mem_ptr + JOURNAL_SECTOR_DATA) = je->last_bytes[s];
1751 js++;
1752 mem_ptr += 1 << SECTOR_SHIFT;
1753 } while (++s < ic->sectors_per_block);
1754 #ifdef INTERNAL_VERIFY
1755 if (ic->internal_hash) {
1756 char checksums_onstack[max(HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
1757
1758 integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack);
1759 if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) {
1760 DMERR_LIMIT("Checksum failed when reading from journal, at sector 0x%llx",
1761 (unsigned long long)logical_sector);
1762 }
1763 }
1764 #endif
1765 }
1766
1767 if (!ic->internal_hash) {
1768 struct bio_integrity_payload *bip = bio_integrity(bio);
1769 unsigned tag_todo = ic->tag_size;
1770 char *tag_ptr = journal_entry_tag(ic, je);
1771
1772 if (bip) do {
1773 struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
1774 unsigned tag_now = min(biv.bv_len, tag_todo);
1775 char *tag_addr;
1776 BUG_ON(PageHighMem(biv.bv_page));
1777 tag_addr = lowmem_page_address(biv.bv_page) + biv.bv_offset;
1778 if (likely(dio->write))
1779 memcpy(tag_ptr, tag_addr, tag_now);
1780 else
1781 memcpy(tag_addr, tag_ptr, tag_now);
1782 bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now);
1783 tag_ptr += tag_now;
1784 tag_todo -= tag_now;
1785 } while (unlikely(tag_todo)); else {
1786 if (likely(dio->write))
1787 memset(tag_ptr, 0, tag_todo);
1788 }
1789 }
1790
1791 if (likely(dio->write)) {
1792 struct journal_sector *js;
1793 unsigned s;
1794
1795 js = access_journal_data(ic, journal_section, journal_entry);
1796 memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT);
1797
1798 s = 0;
1799 do {
1800 je->last_bytes[s] = js[s].commit_id;
1801 } while (++s < ic->sectors_per_block);
1802
1803 if (ic->internal_hash) {
1804 unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1805 if (unlikely(digest_size > ic->tag_size)) {
1806 char checksums_onstack[HASH_MAX_DIGESTSIZE];
1807 integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack);
1808 memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size);
1809 } else
1810 integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je));
1811 }
1812
1813 journal_entry_set_sector(je, logical_sector);
1814 }
1815 logical_sector += ic->sectors_per_block;
1816
1817 journal_entry++;
1818 if (unlikely(journal_entry == ic->journal_section_entries)) {
1819 journal_entry = 0;
1820 journal_section++;
1821 wraparound_section(ic, &journal_section);
1822 }
1823
1824 bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT;
1825 } while (bv.bv_len -= ic->sectors_per_block << SECTOR_SHIFT);
1826
1827 if (unlikely(!dio->write))
1828 flush_dcache_page(bv.bv_page);
1829 kunmap_atomic(mem);
1830 } while (n_sectors);
1831
1832 if (likely(dio->write)) {
1833 smp_mb();
1834 if (unlikely(waitqueue_active(&ic->copy_to_journal_wait)))
1835 wake_up(&ic->copy_to_journal_wait);
1836 if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) {
1837 queue_work(ic->commit_wq, &ic->commit_work);
1838 } else {
1839 schedule_autocommit(ic);
1840 }
1841 } else {
1842 remove_range(ic, &dio->range);
1843 }
1844
1845 if (unlikely(bio->bi_iter.bi_size)) {
1846 sector_t area, offset;
1847
1848 dio->range.logical_sector = logical_sector;
1849 get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1850 dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1851 return true;
1852 }
1853
1854 return false;
1855 }
1856
1857 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map)
1858 {
1859 struct dm_integrity_c *ic = dio->ic;
1860 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1861 unsigned journal_section, journal_entry;
1862 unsigned journal_read_pos;
1863 struct completion read_comp;
1864 bool need_sync_io = ic->internal_hash && !dio->write;
1865
1866 if (need_sync_io && from_map) {
1867 INIT_WORK(&dio->work, integrity_bio_wait);
1868 queue_work(ic->metadata_wq, &dio->work);
1869 return;
1870 }
1871
1872 lock_retry:
1873 spin_lock_irq(&ic->endio_wait.lock);
1874 retry:
1875 if (unlikely(dm_integrity_failed(ic))) {
1876 spin_unlock_irq(&ic->endio_wait.lock);
1877 do_endio(ic, bio);
1878 return;
1879 }
1880 dio->range.n_sectors = bio_sectors(bio);
1881 journal_read_pos = NOT_FOUND;
1882 if (likely(ic->mode == 'J')) {
1883 if (dio->write) {
1884 unsigned next_entry, i, pos;
1885 unsigned ws, we, range_sectors;
1886
1887 dio->range.n_sectors = min(dio->range.n_sectors,
1888 (sector_t)ic->free_sectors << ic->sb->log2_sectors_per_block);
1889 if (unlikely(!dio->range.n_sectors)) {
1890 if (from_map)
1891 goto offload_to_thread;
1892 sleep_on_endio_wait(ic);
1893 goto retry;
1894 }
1895 range_sectors = dio->range.n_sectors >> ic->sb->log2_sectors_per_block;
1896 ic->free_sectors -= range_sectors;
1897 journal_section = ic->free_section;
1898 journal_entry = ic->free_section_entry;
1899
1900 next_entry = ic->free_section_entry + range_sectors;
1901 ic->free_section_entry = next_entry % ic->journal_section_entries;
1902 ic->free_section += next_entry / ic->journal_section_entries;
1903 ic->n_uncommitted_sections += next_entry / ic->journal_section_entries;
1904 wraparound_section(ic, &ic->free_section);
1905
1906 pos = journal_section * ic->journal_section_entries + journal_entry;
1907 ws = journal_section;
1908 we = journal_entry;
1909 i = 0;
1910 do {
1911 struct journal_entry *je;
1912
1913 add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i);
1914 pos++;
1915 if (unlikely(pos >= ic->journal_entries))
1916 pos = 0;
1917
1918 je = access_journal_entry(ic, ws, we);
1919 BUG_ON(!journal_entry_is_unused(je));
1920 journal_entry_set_inprogress(je);
1921 we++;
1922 if (unlikely(we == ic->journal_section_entries)) {
1923 we = 0;
1924 ws++;
1925 wraparound_section(ic, &ws);
1926 }
1927 } while ((i += ic->sectors_per_block) < dio->range.n_sectors);
1928
1929 spin_unlock_irq(&ic->endio_wait.lock);
1930 goto journal_read_write;
1931 } else {
1932 sector_t next_sector;
1933 journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
1934 if (likely(journal_read_pos == NOT_FOUND)) {
1935 if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector))
1936 dio->range.n_sectors = next_sector - dio->range.logical_sector;
1937 } else {
1938 unsigned i;
1939 unsigned jp = journal_read_pos + 1;
1940 for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) {
1941 if (!test_journal_node(ic, jp, dio->range.logical_sector + i))
1942 break;
1943 }
1944 dio->range.n_sectors = i;
1945 }
1946 }
1947 }
1948 if (unlikely(!add_new_range(ic, &dio->range, true))) {
1949 /*
1950 * We must not sleep in the request routine because it could
1951 * stall bios on current->bio_list.
1952 * So, we offload the bio to a workqueue if we have to sleep.
1953 */
1954 if (from_map) {
1955 offload_to_thread:
1956 spin_unlock_irq(&ic->endio_wait.lock);
1957 INIT_WORK(&dio->work, integrity_bio_wait);
1958 queue_work(ic->wait_wq, &dio->work);
1959 return;
1960 }
1961 if (journal_read_pos != NOT_FOUND)
1962 dio->range.n_sectors = ic->sectors_per_block;
1963 wait_and_add_new_range(ic, &dio->range);
1964 /*
1965 * wait_and_add_new_range drops the spinlock, so the journal
1966 * may have been changed arbitrarily. We need to recheck.
1967 * To simplify the code, we restrict I/O size to just one block.
1968 */
1969 if (journal_read_pos != NOT_FOUND) {
1970 sector_t next_sector;
1971 unsigned new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
1972 if (unlikely(new_pos != journal_read_pos)) {
1973 remove_range_unlocked(ic, &dio->range);
1974 goto retry;
1975 }
1976 }
1977 }
1978 spin_unlock_irq(&ic->endio_wait.lock);
1979
1980 if (unlikely(journal_read_pos != NOT_FOUND)) {
1981 journal_section = journal_read_pos / ic->journal_section_entries;
1982 journal_entry = journal_read_pos % ic->journal_section_entries;
1983 goto journal_read_write;
1984 }
1985
1986 if (ic->mode == 'B' && dio->write) {
1987 if (!block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
1988 dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
1989 struct bitmap_block_status *bbs;
1990
1991 bbs = sector_to_bitmap_block(ic, dio->range.logical_sector);
1992 spin_lock(&bbs->bio_queue_lock);
1993 bio_list_add(&bbs->bio_queue, bio);
1994 spin_unlock(&bbs->bio_queue_lock);
1995 queue_work(ic->writer_wq, &bbs->work);
1996 return;
1997 }
1998 }
1999
2000 dio->in_flight = (atomic_t)ATOMIC_INIT(2);
2001
2002 if (need_sync_io) {
2003 init_completion(&read_comp);
2004 dio->completion = &read_comp;
2005 } else
2006 dio->completion = NULL;
2007
2008 dio->orig_bi_iter = bio->bi_iter;
2009
2010 dio->orig_bi_disk = bio->bi_disk;
2011 dio->orig_bi_partno = bio->bi_partno;
2012 bio_set_dev(bio, ic->dev->bdev);
2013
2014 dio->orig_bi_integrity = bio_integrity(bio);
2015 bio->bi_integrity = NULL;
2016 bio->bi_opf &= ~REQ_INTEGRITY;
2017
2018 dio->orig_bi_end_io = bio->bi_end_io;
2019 bio->bi_end_io = integrity_end_io;
2020
2021 bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT;
2022 generic_make_request(bio);
2023
2024 if (need_sync_io) {
2025 wait_for_completion_io(&read_comp);
2026 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
2027 dio->range.logical_sector + dio->range.n_sectors > le64_to_cpu(ic->sb->recalc_sector))
2028 goto skip_check;
2029 if (ic->mode == 'B') {
2030 if (!block_bitmap_op(ic, ic->recalc_bitmap, dio->range.logical_sector,
2031 dio->range.n_sectors, BITMAP_OP_TEST_ALL_CLEAR))
2032 goto skip_check;
2033 }
2034
2035 if (likely(!bio->bi_status))
2036 integrity_metadata(&dio->work);
2037 else
2038 skip_check:
2039 dec_in_flight(dio);
2040
2041 } else {
2042 INIT_WORK(&dio->work, integrity_metadata);
2043 queue_work(ic->metadata_wq, &dio->work);
2044 }
2045
2046 return;
2047
2048 journal_read_write:
2049 if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry)))
2050 goto lock_retry;
2051
2052 do_endio_flush(ic, dio);
2053 }
2054
2055
2056 static void integrity_bio_wait(struct work_struct *w)
2057 {
2058 struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
2059
2060 dm_integrity_map_continue(dio, false);
2061 }
2062
2063 static void pad_uncommitted(struct dm_integrity_c *ic)
2064 {
2065 if (ic->free_section_entry) {
2066 ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry;
2067 ic->free_section_entry = 0;
2068 ic->free_section++;
2069 wraparound_section(ic, &ic->free_section);
2070 ic->n_uncommitted_sections++;
2071 }
2072 if (WARN_ON(ic->journal_sections * ic->journal_section_entries !=
2073 (ic->n_uncommitted_sections + ic->n_committed_sections) *
2074 ic->journal_section_entries + ic->free_sectors)) {
2075 DMCRIT("journal_sections %u, journal_section_entries %u, "
2076 "n_uncommitted_sections %u, n_committed_sections %u, "
2077 "journal_section_entries %u, free_sectors %u",
2078 ic->journal_sections, ic->journal_section_entries,
2079 ic->n_uncommitted_sections, ic->n_committed_sections,
2080 ic->journal_section_entries, ic->free_sectors);
2081 }
2082 }
2083
2084 static void integrity_commit(struct work_struct *w)
2085 {
2086 struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work);
2087 unsigned commit_start, commit_sections;
2088 unsigned i, j, n;
2089 struct bio *flushes;
2090
2091 del_timer(&ic->autocommit_timer);
2092
2093 spin_lock_irq(&ic->endio_wait.lock);
2094 flushes = bio_list_get(&ic->flush_bio_list);
2095 if (unlikely(ic->mode != 'J')) {
2096 spin_unlock_irq(&ic->endio_wait.lock);
2097 dm_integrity_flush_buffers(ic);
2098 goto release_flush_bios;
2099 }
2100
2101 pad_uncommitted(ic);
2102 commit_start = ic->uncommitted_section;
2103 commit_sections = ic->n_uncommitted_sections;
2104 spin_unlock_irq(&ic->endio_wait.lock);
2105
2106 if (!commit_sections)
2107 goto release_flush_bios;
2108
2109 i = commit_start;
2110 for (n = 0; n < commit_sections; n++) {
2111 for (j = 0; j < ic->journal_section_entries; j++) {
2112 struct journal_entry *je;
2113 je = access_journal_entry(ic, i, j);
2114 io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
2115 }
2116 for (j = 0; j < ic->journal_section_sectors; j++) {
2117 struct journal_sector *js;
2118 js = access_journal(ic, i, j);
2119 js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq);
2120 }
2121 i++;
2122 if (unlikely(i >= ic->journal_sections))
2123 ic->commit_seq = next_commit_seq(ic->commit_seq);
2124 wraparound_section(ic, &i);
2125 }
2126 smp_rmb();
2127
2128 write_journal(ic, commit_start, commit_sections);
2129
2130 spin_lock_irq(&ic->endio_wait.lock);
2131 ic->uncommitted_section += commit_sections;
2132 wraparound_section(ic, &ic->uncommitted_section);
2133 ic->n_uncommitted_sections -= commit_sections;
2134 ic->n_committed_sections += commit_sections;
2135 spin_unlock_irq(&ic->endio_wait.lock);
2136
2137 if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold)
2138 queue_work(ic->writer_wq, &ic->writer_work);
2139
2140 release_flush_bios:
2141 while (flushes) {
2142 struct bio *next = flushes->bi_next;
2143 flushes->bi_next = NULL;
2144 do_endio(ic, flushes);
2145 flushes = next;
2146 }
2147 }
2148
2149 static void complete_copy_from_journal(unsigned long error, void *context)
2150 {
2151 struct journal_io *io = context;
2152 struct journal_completion *comp = io->comp;
2153 struct dm_integrity_c *ic = comp->ic;
2154 remove_range(ic, &io->range);
2155 mempool_free(io, &ic->journal_io_mempool);
2156 if (unlikely(error != 0))
2157 dm_integrity_io_error(ic, "copying from journal", -EIO);
2158 complete_journal_op(comp);
2159 }
2160
2161 static void restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js,
2162 struct journal_entry *je)
2163 {
2164 unsigned s = 0;
2165 do {
2166 js->commit_id = je->last_bytes[s];
2167 js++;
2168 } while (++s < ic->sectors_per_block);
2169 }
2170
2171 static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start,
2172 unsigned write_sections, bool from_replay)
2173 {
2174 unsigned i, j, n;
2175 struct journal_completion comp;
2176 struct blk_plug plug;
2177
2178 blk_start_plug(&plug);
2179
2180 comp.ic = ic;
2181 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
2182 init_completion(&comp.comp);
2183
2184 i = write_start;
2185 for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) {
2186 #ifndef INTERNAL_VERIFY
2187 if (unlikely(from_replay))
2188 #endif
2189 rw_section_mac(ic, i, false);
2190 for (j = 0; j < ic->journal_section_entries; j++) {
2191 struct journal_entry *je = access_journal_entry(ic, i, j);
2192 sector_t sec, area, offset;
2193 unsigned k, l, next_loop;
2194 sector_t metadata_block;
2195 unsigned metadata_offset;
2196 struct journal_io *io;
2197
2198 if (journal_entry_is_unused(je))
2199 continue;
2200 BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay);
2201 sec = journal_entry_get_sector(je);
2202 if (unlikely(from_replay)) {
2203 if (unlikely(sec & (unsigned)(ic->sectors_per_block - 1))) {
2204 dm_integrity_io_error(ic, "invalid sector in journal", -EIO);
2205 sec &= ~(sector_t)(ic->sectors_per_block - 1);
2206 }
2207 }
2208 get_area_and_offset(ic, sec, &area, &offset);
2209 restore_last_bytes(ic, access_journal_data(ic, i, j), je);
2210 for (k = j + 1; k < ic->journal_section_entries; k++) {
2211 struct journal_entry *je2 = access_journal_entry(ic, i, k);
2212 sector_t sec2, area2, offset2;
2213 if (journal_entry_is_unused(je2))
2214 break;
2215 BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay);
2216 sec2 = journal_entry_get_sector(je2);
2217 get_area_and_offset(ic, sec2, &area2, &offset2);
2218 if (area2 != area || offset2 != offset + ((k - j) << ic->sb->log2_sectors_per_block))
2219 break;
2220 restore_last_bytes(ic, access_journal_data(ic, i, k), je2);
2221 }
2222 next_loop = k - 1;
2223
2224 io = mempool_alloc(&ic->journal_io_mempool, GFP_NOIO);
2225 io->comp = &comp;
2226 io->range.logical_sector = sec;
2227 io->range.n_sectors = (k - j) << ic->sb->log2_sectors_per_block;
2228
2229 spin_lock_irq(&ic->endio_wait.lock);
2230 add_new_range_and_wait(ic, &io->range);
2231
2232 if (likely(!from_replay)) {
2233 struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries];
2234
2235 /* don't write if there is newer committed sector */
2236 while (j < k && find_newer_committed_node(ic, &section_node[j])) {
2237 struct journal_entry *je2 = access_journal_entry(ic, i, j);
2238
2239 journal_entry_set_unused(je2);
2240 remove_journal_node(ic, &section_node[j]);
2241 j++;
2242 sec += ic->sectors_per_block;
2243 offset += ic->sectors_per_block;
2244 }
2245 while (j < k && find_newer_committed_node(ic, &section_node[k - 1])) {
2246 struct journal_entry *je2 = access_journal_entry(ic, i, k - 1);
2247
2248 journal_entry_set_unused(je2);
2249 remove_journal_node(ic, &section_node[k - 1]);
2250 k--;
2251 }
2252 if (j == k) {
2253 remove_range_unlocked(ic, &io->range);
2254 spin_unlock_irq(&ic->endio_wait.lock);
2255 mempool_free(io, &ic->journal_io_mempool);
2256 goto skip_io;
2257 }
2258 for (l = j; l < k; l++) {
2259 remove_journal_node(ic, &section_node[l]);
2260 }
2261 }
2262 spin_unlock_irq(&ic->endio_wait.lock);
2263
2264 metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2265 for (l = j; l < k; l++) {
2266 int r;
2267 struct journal_entry *je2 = access_journal_entry(ic, i, l);
2268
2269 if (
2270 #ifndef INTERNAL_VERIFY
2271 unlikely(from_replay) &&
2272 #endif
2273 ic->internal_hash) {
2274 char test_tag[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
2275
2276 integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block),
2277 (char *)access_journal_data(ic, i, l), test_tag);
2278 if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size)))
2279 dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ);
2280 }
2281
2282 journal_entry_set_unused(je2);
2283 r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset,
2284 ic->tag_size, TAG_WRITE);
2285 if (unlikely(r)) {
2286 dm_integrity_io_error(ic, "reading tags", r);
2287 }
2288 }
2289
2290 atomic_inc(&comp.in_flight);
2291 copy_from_journal(ic, i, j << ic->sb->log2_sectors_per_block,
2292 (k - j) << ic->sb->log2_sectors_per_block,
2293 get_data_sector(ic, area, offset),
2294 complete_copy_from_journal, io);
2295 skip_io:
2296 j = next_loop;
2297 }
2298 }
2299
2300 dm_bufio_write_dirty_buffers_async(ic->bufio);
2301
2302 blk_finish_plug(&plug);
2303
2304 complete_journal_op(&comp);
2305 wait_for_completion_io(&comp.comp);
2306
2307 dm_integrity_flush_buffers(ic);
2308 }
2309
2310 static void integrity_writer(struct work_struct *w)
2311 {
2312 struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work);
2313 unsigned write_start, write_sections;
2314
2315 unsigned prev_free_sectors;
2316
2317 /* the following test is not needed, but it tests the replay code */
2318 if (READ_ONCE(ic->suspending) && !ic->meta_dev)
2319 return;
2320
2321 spin_lock_irq(&ic->endio_wait.lock);
2322 write_start = ic->committed_section;
2323 write_sections = ic->n_committed_sections;
2324 spin_unlock_irq(&ic->endio_wait.lock);
2325
2326 if (!write_sections)
2327 return;
2328
2329 do_journal_write(ic, write_start, write_sections, false);
2330
2331 spin_lock_irq(&ic->endio_wait.lock);
2332
2333 ic->committed_section += write_sections;
2334 wraparound_section(ic, &ic->committed_section);
2335 ic->n_committed_sections -= write_sections;
2336
2337 prev_free_sectors = ic->free_sectors;
2338 ic->free_sectors += write_sections * ic->journal_section_entries;
2339 if (unlikely(!prev_free_sectors))
2340 wake_up_locked(&ic->endio_wait);
2341
2342 spin_unlock_irq(&ic->endio_wait.lock);
2343 }
2344
2345 static void recalc_write_super(struct dm_integrity_c *ic)
2346 {
2347 int r;
2348
2349 dm_integrity_flush_buffers(ic);
2350 if (dm_integrity_failed(ic))
2351 return;
2352
2353 r = sync_rw_sb(ic, REQ_OP_WRITE, 0);
2354 if (unlikely(r))
2355 dm_integrity_io_error(ic, "writing superblock", r);
2356 }
2357
2358 static void integrity_recalc(struct work_struct *w)
2359 {
2360 struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, recalc_work);
2361 struct dm_integrity_range range;
2362 struct dm_io_request io_req;
2363 struct dm_io_region io_loc;
2364 sector_t area, offset;
2365 sector_t metadata_block;
2366 unsigned metadata_offset;
2367 sector_t logical_sector, n_sectors;
2368 __u8 *t;
2369 unsigned i;
2370 int r;
2371 unsigned super_counter = 0;
2372
2373 DEBUG_print("start recalculation... (position %llx)\n", le64_to_cpu(ic->sb->recalc_sector));
2374
2375 spin_lock_irq(&ic->endio_wait.lock);
2376
2377 next_chunk:
2378
2379 if (unlikely(READ_ONCE(ic->suspending)))
2380 goto unlock_ret;
2381
2382 range.logical_sector = le64_to_cpu(ic->sb->recalc_sector);
2383 if (unlikely(range.logical_sector >= ic->provided_data_sectors)) {
2384 if (ic->mode == 'B') {
2385 DEBUG_print("queue_delayed_work: bitmap_flush_work\n");
2386 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
2387 }
2388 goto unlock_ret;
2389 }
2390
2391 get_area_and_offset(ic, range.logical_sector, &area, &offset);
2392 range.n_sectors = min((sector_t)RECALC_SECTORS, ic->provided_data_sectors - range.logical_sector);
2393 if (!ic->meta_dev)
2394 range.n_sectors = min(range.n_sectors, ((sector_t)1U << ic->sb->log2_interleave_sectors) - (unsigned)offset);
2395
2396 add_new_range_and_wait(ic, &range);
2397 spin_unlock_irq(&ic->endio_wait.lock);
2398 logical_sector = range.logical_sector;
2399 n_sectors = range.n_sectors;
2400
2401 if (ic->mode == 'B') {
2402 if (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector, n_sectors, BITMAP_OP_TEST_ALL_CLEAR)) {
2403 goto advance_and_next;
2404 }
2405 while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector,
2406 ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
2407 logical_sector += ic->sectors_per_block;
2408 n_sectors -= ic->sectors_per_block;
2409 cond_resched();
2410 }
2411 while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector + n_sectors - ic->sectors_per_block,
2412 ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
2413 n_sectors -= ic->sectors_per_block;
2414 cond_resched();
2415 }
2416 get_area_and_offset(ic, logical_sector, &area, &offset);
2417 }
2418
2419 DEBUG_print("recalculating: %lx, %lx\n", logical_sector, n_sectors);
2420
2421 if (unlikely(++super_counter == RECALC_WRITE_SUPER)) {
2422 recalc_write_super(ic);
2423 if (ic->mode == 'B') {
2424 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2425 }
2426 super_counter = 0;
2427 }
2428
2429 if (unlikely(dm_integrity_failed(ic)))
2430 goto err;
2431
2432 io_req.bi_op = REQ_OP_READ;
2433 io_req.bi_op_flags = 0;
2434 io_req.mem.type = DM_IO_VMA;
2435 io_req.mem.ptr.addr = ic->recalc_buffer;
2436 io_req.notify.fn = NULL;
2437 io_req.client = ic->io;
2438 io_loc.bdev = ic->dev->bdev;
2439 io_loc.sector = get_data_sector(ic, area, offset);
2440 io_loc.count = n_sectors;
2441
2442 r = dm_io(&io_req, 1, &io_loc, NULL);
2443 if (unlikely(r)) {
2444 dm_integrity_io_error(ic, "reading data", r);
2445 goto err;
2446 }
2447
2448 t = ic->recalc_tags;
2449 for (i = 0; i < n_sectors; i += ic->sectors_per_block) {
2450 integrity_sector_checksum(ic, logical_sector + i, ic->recalc_buffer + (i << SECTOR_SHIFT), t);
2451 t += ic->tag_size;
2452 }
2453
2454 metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2455
2456 r = dm_integrity_rw_tag(ic, ic->recalc_tags, &metadata_block, &metadata_offset, t - ic->recalc_tags, TAG_WRITE);
2457 if (unlikely(r)) {
2458 dm_integrity_io_error(ic, "writing tags", r);
2459 goto err;
2460 }
2461
2462 advance_and_next:
2463 cond_resched();
2464
2465 spin_lock_irq(&ic->endio_wait.lock);
2466 remove_range_unlocked(ic, &range);
2467 ic->sb->recalc_sector = cpu_to_le64(range.logical_sector + range.n_sectors);
2468 goto next_chunk;
2469
2470 err:
2471 remove_range(ic, &range);
2472 return;
2473
2474 unlock_ret:
2475 spin_unlock_irq(&ic->endio_wait.lock);
2476
2477 recalc_write_super(ic);
2478 }
2479
2480 static void bitmap_block_work(struct work_struct *w)
2481 {
2482 struct bitmap_block_status *bbs = container_of(w, struct bitmap_block_status, work);
2483 struct dm_integrity_c *ic = bbs->ic;
2484 struct bio *bio;
2485 struct bio_list bio_queue;
2486 struct bio_list waiting;
2487
2488 bio_list_init(&waiting);
2489
2490 spin_lock(&bbs->bio_queue_lock);
2491 bio_queue = bbs->bio_queue;
2492 bio_list_init(&bbs->bio_queue);
2493 spin_unlock(&bbs->bio_queue_lock);
2494
2495 while ((bio = bio_list_pop(&bio_queue))) {
2496 struct dm_integrity_io *dio;
2497
2498 dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2499
2500 if (block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2501 dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
2502 remove_range(ic, &dio->range);
2503 INIT_WORK(&dio->work, integrity_bio_wait);
2504 queue_work(ic->wait_wq, &dio->work);
2505 } else {
2506 block_bitmap_op(ic, ic->journal, dio->range.logical_sector,
2507 dio->range.n_sectors, BITMAP_OP_SET);
2508 bio_list_add(&waiting, bio);
2509 }
2510 }
2511
2512 if (bio_list_empty(&waiting))
2513 return;
2514
2515 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC,
2516 bbs->idx * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT),
2517 BITMAP_BLOCK_SIZE >> SECTOR_SHIFT, NULL);
2518
2519 while ((bio = bio_list_pop(&waiting))) {
2520 struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2521
2522 block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2523 dio->range.n_sectors, BITMAP_OP_SET);
2524
2525 remove_range(ic, &dio->range);
2526 INIT_WORK(&dio->work, integrity_bio_wait);
2527 queue_work(ic->wait_wq, &dio->work);
2528 }
2529
2530 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2531 }
2532
2533 static void bitmap_flush_work(struct work_struct *work)
2534 {
2535 struct dm_integrity_c *ic = container_of(work, struct dm_integrity_c, bitmap_flush_work.work);
2536 struct dm_integrity_range range;
2537 unsigned long limit;
2538 struct bio *bio;
2539
2540 dm_integrity_flush_buffers(ic);
2541
2542 range.logical_sector = 0;
2543 range.n_sectors = ic->provided_data_sectors;
2544
2545 spin_lock_irq(&ic->endio_wait.lock);
2546 add_new_range_and_wait(ic, &range);
2547 spin_unlock_irq(&ic->endio_wait.lock);
2548
2549 dm_integrity_flush_buffers(ic);
2550 if (ic->meta_dev)
2551 blkdev_issue_flush(ic->dev->bdev, GFP_NOIO, NULL);
2552
2553 limit = ic->provided_data_sectors;
2554 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
2555 limit = le64_to_cpu(ic->sb->recalc_sector)
2556 >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)
2557 << (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2558 }
2559 /*DEBUG_print("zeroing journal\n");*/
2560 block_bitmap_op(ic, ic->journal, 0, limit, BITMAP_OP_CLEAR);
2561 block_bitmap_op(ic, ic->may_write_bitmap, 0, limit, BITMAP_OP_CLEAR);
2562
2563 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
2564 ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2565
2566 spin_lock_irq(&ic->endio_wait.lock);
2567 remove_range_unlocked(ic, &range);
2568 while (unlikely((bio = bio_list_pop(&ic->synchronous_bios)) != NULL)) {
2569 bio_endio(bio);
2570 spin_unlock_irq(&ic->endio_wait.lock);
2571 spin_lock_irq(&ic->endio_wait.lock);
2572 }
2573 spin_unlock_irq(&ic->endio_wait.lock);
2574 }
2575
2576
2577 static void init_journal(struct dm_integrity_c *ic, unsigned start_section,
2578 unsigned n_sections, unsigned char commit_seq)
2579 {
2580 unsigned i, j, n;
2581
2582 if (!n_sections)
2583 return;
2584
2585 for (n = 0; n < n_sections; n++) {
2586 i = start_section + n;
2587 wraparound_section(ic, &i);
2588 for (j = 0; j < ic->journal_section_sectors; j++) {
2589 struct journal_sector *js = access_journal(ic, i, j);
2590 memset(&js->entries, 0, JOURNAL_SECTOR_DATA);
2591 js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq);
2592 }
2593 for (j = 0; j < ic->journal_section_entries; j++) {
2594 struct journal_entry *je = access_journal_entry(ic, i, j);
2595 journal_entry_set_unused(je);
2596 }
2597 }
2598
2599 write_journal(ic, start_section, n_sections);
2600 }
2601
2602 static int find_commit_seq(struct dm_integrity_c *ic, unsigned i, unsigned j, commit_id_t id)
2603 {
2604 unsigned char k;
2605 for (k = 0; k < N_COMMIT_IDS; k++) {
2606 if (dm_integrity_commit_id(ic, i, j, k) == id)
2607 return k;
2608 }
2609 dm_integrity_io_error(ic, "journal commit id", -EIO);
2610 return -EIO;
2611 }
2612
2613 static void replay_journal(struct dm_integrity_c *ic)
2614 {
2615 unsigned i, j;
2616 bool used_commit_ids[N_COMMIT_IDS];
2617 unsigned max_commit_id_sections[N_COMMIT_IDS];
2618 unsigned write_start, write_sections;
2619 unsigned continue_section;
2620 bool journal_empty;
2621 unsigned char unused, last_used, want_commit_seq;
2622
2623 if (ic->mode == 'R')
2624 return;
2625
2626 if (ic->journal_uptodate)
2627 return;
2628
2629 last_used = 0;
2630 write_start = 0;
2631
2632 if (!ic->just_formatted) {
2633 DEBUG_print("reading journal\n");
2634 rw_journal(ic, REQ_OP_READ, 0, 0, ic->journal_sections, NULL);
2635 if (ic->journal_io)
2636 DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal");
2637 if (ic->journal_io) {
2638 struct journal_completion crypt_comp;
2639 crypt_comp.ic = ic;
2640 init_completion(&crypt_comp.comp);
2641 crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0);
2642 encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp);
2643 wait_for_completion(&crypt_comp.comp);
2644 }
2645 DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal");
2646 }
2647
2648 if (dm_integrity_failed(ic))
2649 goto clear_journal;
2650
2651 journal_empty = true;
2652 memset(used_commit_ids, 0, sizeof used_commit_ids);
2653 memset(max_commit_id_sections, 0, sizeof max_commit_id_sections);
2654 for (i = 0; i < ic->journal_sections; i++) {
2655 for (j = 0; j < ic->journal_section_sectors; j++) {
2656 int k;
2657 struct journal_sector *js = access_journal(ic, i, j);
2658 k = find_commit_seq(ic, i, j, js->commit_id);
2659 if (k < 0)
2660 goto clear_journal;
2661 used_commit_ids[k] = true;
2662 max_commit_id_sections[k] = i;
2663 }
2664 if (journal_empty) {
2665 for (j = 0; j < ic->journal_section_entries; j++) {
2666 struct journal_entry *je = access_journal_entry(ic, i, j);
2667 if (!journal_entry_is_unused(je)) {
2668 journal_empty = false;
2669 break;
2670 }
2671 }
2672 }
2673 }
2674
2675 if (!used_commit_ids[N_COMMIT_IDS - 1]) {
2676 unused = N_COMMIT_IDS - 1;
2677 while (unused && !used_commit_ids[unused - 1])
2678 unused--;
2679 } else {
2680 for (unused = 0; unused < N_COMMIT_IDS; unused++)
2681 if (!used_commit_ids[unused])
2682 break;
2683 if (unused == N_COMMIT_IDS) {
2684 dm_integrity_io_error(ic, "journal commit ids", -EIO);
2685 goto clear_journal;
2686 }
2687 }
2688 DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n",
2689 unused, used_commit_ids[0], used_commit_ids[1],
2690 used_commit_ids[2], used_commit_ids[3]);
2691
2692 last_used = prev_commit_seq(unused);
2693 want_commit_seq = prev_commit_seq(last_used);
2694
2695 if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)])
2696 journal_empty = true;
2697
2698 write_start = max_commit_id_sections[last_used] + 1;
2699 if (unlikely(write_start >= ic->journal_sections))
2700 want_commit_seq = next_commit_seq(want_commit_seq);
2701 wraparound_section(ic, &write_start);
2702
2703 i = write_start;
2704 for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) {
2705 for (j = 0; j < ic->journal_section_sectors; j++) {
2706 struct journal_sector *js = access_journal(ic, i, j);
2707
2708 if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) {
2709 /*
2710 * This could be caused by crash during writing.
2711 * We won't replay the inconsistent part of the
2712 * journal.
2713 */
2714 DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n",
2715 i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq);
2716 goto brk;
2717 }
2718 }
2719 i++;
2720 if (unlikely(i >= ic->journal_sections))
2721 want_commit_seq = next_commit_seq(want_commit_seq);
2722 wraparound_section(ic, &i);
2723 }
2724 brk:
2725
2726 if (!journal_empty) {
2727 DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n",
2728 write_sections, write_start, want_commit_seq);
2729 do_journal_write(ic, write_start, write_sections, true);
2730 }
2731
2732 if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) {
2733 continue_section = write_start;
2734 ic->commit_seq = want_commit_seq;
2735 DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq);
2736 } else {
2737 unsigned s;
2738 unsigned char erase_seq;
2739 clear_journal:
2740 DEBUG_print("clearing journal\n");
2741
2742 erase_seq = prev_commit_seq(prev_commit_seq(last_used));
2743 s = write_start;
2744 init_journal(ic, s, 1, erase_seq);
2745 s++;
2746 wraparound_section(ic, &s);
2747 if (ic->journal_sections >= 2) {
2748 init_journal(ic, s, ic->journal_sections - 2, erase_seq);
2749 s += ic->journal_sections - 2;
2750 wraparound_section(ic, &s);
2751 init_journal(ic, s, 1, erase_seq);
2752 }
2753
2754 continue_section = 0;
2755 ic->commit_seq = next_commit_seq(erase_seq);
2756 }
2757
2758 ic->committed_section = continue_section;
2759 ic->n_committed_sections = 0;
2760
2761 ic->uncommitted_section = continue_section;
2762 ic->n_uncommitted_sections = 0;
2763
2764 ic->free_section = continue_section;
2765 ic->free_section_entry = 0;
2766 ic->free_sectors = ic->journal_entries;
2767
2768 ic->journal_tree_root = RB_ROOT;
2769 for (i = 0; i < ic->journal_entries; i++)
2770 init_journal_node(&ic->journal_tree[i]);
2771 }
2772
2773 static void dm_integrity_enter_synchronous_mode(struct dm_integrity_c *ic)
2774 {
2775 DEBUG_print("dm_integrity_enter_synchronous_mode\n");
2776
2777 if (ic->mode == 'B') {
2778 ic->bitmap_flush_interval = msecs_to_jiffies(10) + 1;
2779 ic->synchronous_mode = 1;
2780
2781 cancel_delayed_work_sync(&ic->bitmap_flush_work);
2782 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
2783 flush_workqueue(ic->commit_wq);
2784 }
2785 }
2786
2787 static int dm_integrity_reboot(struct notifier_block *n, unsigned long code, void *x)
2788 {
2789 struct dm_integrity_c *ic = container_of(n, struct dm_integrity_c, reboot_notifier);
2790
2791 DEBUG_print("dm_integrity_reboot\n");
2792
2793 dm_integrity_enter_synchronous_mode(ic);
2794
2795 return NOTIFY_DONE;
2796 }
2797
2798 static void dm_integrity_postsuspend(struct dm_target *ti)
2799 {
2800 struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2801 int r;
2802
2803 WARN_ON(unregister_reboot_notifier(&ic->reboot_notifier));
2804
2805 del_timer_sync(&ic->autocommit_timer);
2806
2807 WRITE_ONCE(ic->suspending, 1);
2808
2809 if (ic->recalc_wq)
2810 drain_workqueue(ic->recalc_wq);
2811
2812 if (ic->mode == 'B')
2813 cancel_delayed_work_sync(&ic->bitmap_flush_work);
2814
2815 queue_work(ic->commit_wq, &ic->commit_work);
2816 drain_workqueue(ic->commit_wq);
2817
2818 if (ic->mode == 'J') {
2819 if (ic->meta_dev)
2820 queue_work(ic->writer_wq, &ic->writer_work);
2821 drain_workqueue(ic->writer_wq);
2822 dm_integrity_flush_buffers(ic);
2823 }
2824
2825 if (ic->mode == 'B') {
2826 dm_integrity_flush_buffers(ic);
2827 #if 1
2828 /* set to 0 to test bitmap replay code */
2829 init_journal(ic, 0, ic->journal_sections, 0);
2830 ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
2831 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
2832 if (unlikely(r))
2833 dm_integrity_io_error(ic, "writing superblock", r);
2834 #endif
2835 }
2836
2837 WRITE_ONCE(ic->suspending, 0);
2838
2839 BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
2840
2841 ic->journal_uptodate = true;
2842 }
2843
2844 static void dm_integrity_resume(struct dm_target *ti)
2845 {
2846 struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2847 int r;
2848 DEBUG_print("resume\n");
2849
2850 if (ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP)) {
2851 DEBUG_print("resume dirty_bitmap\n");
2852 rw_journal_sectors(ic, REQ_OP_READ, 0, 0,
2853 ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2854 if (ic->mode == 'B') {
2855 if (ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) {
2856 block_bitmap_copy(ic, ic->recalc_bitmap, ic->journal);
2857 block_bitmap_copy(ic, ic->may_write_bitmap, ic->journal);
2858 if (!block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors,
2859 BITMAP_OP_TEST_ALL_CLEAR)) {
2860 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
2861 ic->sb->recalc_sector = cpu_to_le64(0);
2862 }
2863 } else {
2864 DEBUG_print("non-matching blocks_per_bitmap_bit: %u, %u\n",
2865 ic->sb->log2_blocks_per_bitmap_bit, ic->log2_blocks_per_bitmap_bit);
2866 ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
2867 block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
2868 block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
2869 block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_SET);
2870 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
2871 ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2872 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
2873 ic->sb->recalc_sector = cpu_to_le64(0);
2874 }
2875 } else {
2876 if (!(ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
2877 block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR))) {
2878 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
2879 ic->sb->recalc_sector = cpu_to_le64(0);
2880 }
2881 init_journal(ic, 0, ic->journal_sections, 0);
2882 replay_journal(ic);
2883 ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
2884 }
2885 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
2886 if (unlikely(r))
2887 dm_integrity_io_error(ic, "writing superblock", r);
2888 } else {
2889 replay_journal(ic);
2890 if (ic->mode == 'B') {
2891 int mode;
2892 ic->sb->flags |= cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
2893 ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
2894 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
2895 if (unlikely(r))
2896 dm_integrity_io_error(ic, "writing superblock", r);
2897
2898 mode = ic->recalculate_flag ? BITMAP_OP_SET : BITMAP_OP_CLEAR;
2899 block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, mode);
2900 block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, mode);
2901 block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, mode);
2902 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
2903 ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2904 }
2905 }
2906
2907 DEBUG_print("testing recalc: %x\n", ic->sb->flags);
2908 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
2909 __u64 recalc_pos = le64_to_cpu(ic->sb->recalc_sector);
2910 DEBUG_print("recalc pos: %lx / %lx\n", (long)recalc_pos, ic->provided_data_sectors);
2911 if (recalc_pos < ic->provided_data_sectors) {
2912 queue_work(ic->recalc_wq, &ic->recalc_work);
2913 } else if (recalc_pos > ic->provided_data_sectors) {
2914 ic->sb->recalc_sector = cpu_to_le64(ic->provided_data_sectors);
2915 recalc_write_super(ic);
2916 }
2917 }
2918
2919 ic->reboot_notifier.notifier_call = dm_integrity_reboot;
2920 ic->reboot_notifier.next = NULL;
2921 ic->reboot_notifier.priority = INT_MAX - 1; /* be notified after md and before hardware drivers */
2922 WARN_ON(register_reboot_notifier(&ic->reboot_notifier));
2923
2924 #if 0
2925 /* set to 1 to stress test synchronous mode */
2926 dm_integrity_enter_synchronous_mode(ic);
2927 #endif
2928 }
2929
2930 static void dm_integrity_status(struct dm_target *ti, status_type_t type,
2931 unsigned status_flags, char *result, unsigned maxlen)
2932 {
2933 struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2934 unsigned arg_count;
2935 size_t sz = 0;
2936
2937 switch (type) {
2938 case STATUSTYPE_INFO:
2939 DMEMIT("%llu %llu",
2940 (unsigned long long)atomic64_read(&ic->number_of_mismatches),
2941 (unsigned long long)ic->provided_data_sectors);
2942 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
2943 DMEMIT(" %llu", (unsigned long long)le64_to_cpu(ic->sb->recalc_sector));
2944 else
2945 DMEMIT(" -");
2946 break;
2947
2948 case STATUSTYPE_TABLE: {
2949 __u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100;
2950 watermark_percentage += ic->journal_entries / 2;
2951 do_div(watermark_percentage, ic->journal_entries);
2952 arg_count = 3;
2953 arg_count += !!ic->meta_dev;
2954 arg_count += ic->sectors_per_block != 1;
2955 arg_count += !!(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING));
2956 arg_count += ic->mode == 'J';
2957 arg_count += ic->mode == 'J';
2958 arg_count += ic->mode == 'B';
2959 arg_count += ic->mode == 'B';
2960 arg_count += !!ic->internal_hash_alg.alg_string;
2961 arg_count += !!ic->journal_crypt_alg.alg_string;
2962 arg_count += !!ic->journal_mac_alg.alg_string;
2963 arg_count += (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0;
2964 DMEMIT("%s %llu %u %c %u", ic->dev->name, (unsigned long long)ic->start,
2965 ic->tag_size, ic->mode, arg_count);
2966 if (ic->meta_dev)
2967 DMEMIT(" meta_device:%s", ic->meta_dev->name);
2968 if (ic->sectors_per_block != 1)
2969 DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
2970 if (ic->recalculate_flag)
2971 DMEMIT(" recalculate");
2972 DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
2973 DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors);
2974 DMEMIT(" buffer_sectors:%u", 1U << ic->log2_buffer_sectors);
2975 if (ic->mode == 'J') {
2976 DMEMIT(" journal_watermark:%u", (unsigned)watermark_percentage);
2977 DMEMIT(" commit_time:%u", ic->autocommit_msec);
2978 }
2979 if (ic->mode == 'B') {
2980 DMEMIT(" sectors_per_bit:%llu", (unsigned long long)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit);
2981 DMEMIT(" bitmap_flush_interval:%u", jiffies_to_msecs(ic->bitmap_flush_interval));
2982 }
2983 if ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0)
2984 DMEMIT(" fix_padding");
2985
2986 #define EMIT_ALG(a, n) \
2987 do { \
2988 if (ic->a.alg_string) { \
2989 DMEMIT(" %s:%s", n, ic->a.alg_string); \
2990 if (ic->a.key_string) \
2991 DMEMIT(":%s", ic->a.key_string);\
2992 } \
2993 } while (0)
2994 EMIT_ALG(internal_hash_alg, "internal_hash");
2995 EMIT_ALG(journal_crypt_alg, "journal_crypt");
2996 EMIT_ALG(journal_mac_alg, "journal_mac");
2997 break;
2998 }
2999 }
3000 }
3001
3002 static int dm_integrity_iterate_devices(struct dm_target *ti,
3003 iterate_devices_callout_fn fn, void *data)
3004 {
3005 struct dm_integrity_c *ic = ti->private;
3006
3007 if (!ic->meta_dev)
3008 return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data);
3009 else
3010 return fn(ti, ic->dev, 0, ti->len, data);
3011 }
3012
3013 static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits)
3014 {
3015 struct dm_integrity_c *ic = ti->private;
3016
3017 if (ic->sectors_per_block > 1) {
3018 limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
3019 limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
3020 blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT);
3021 }
3022 }
3023
3024 static void calculate_journal_section_size(struct dm_integrity_c *ic)
3025 {
3026 unsigned sector_space = JOURNAL_SECTOR_DATA;
3027
3028 ic->journal_sections = le32_to_cpu(ic->sb->journal_sections);
3029 ic->journal_entry_size = roundup(offsetof(struct journal_entry, last_bytes[ic->sectors_per_block]) + ic->tag_size,
3030 JOURNAL_ENTRY_ROUNDUP);
3031
3032 if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC))
3033 sector_space -= JOURNAL_MAC_PER_SECTOR;
3034 ic->journal_entries_per_sector = sector_space / ic->journal_entry_size;
3035 ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS;
3036 ic->journal_section_sectors = (ic->journal_section_entries << ic->sb->log2_sectors_per_block) + JOURNAL_BLOCK_SECTORS;
3037 ic->journal_entries = ic->journal_section_entries * ic->journal_sections;
3038 }
3039
3040 static int calculate_device_limits(struct dm_integrity_c *ic)
3041 {
3042 __u64 initial_sectors;
3043
3044 calculate_journal_section_size(ic);
3045 initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections;
3046 if (initial_sectors + METADATA_PADDING_SECTORS >= ic->meta_device_sectors || initial_sectors > UINT_MAX)
3047 return -EINVAL;
3048 ic->initial_sectors = initial_sectors;
3049
3050 if (!ic->meta_dev) {
3051 sector_t last_sector, last_area, last_offset;
3052
3053 /* we have to maintain excessive padding for compatibility with existing volumes */
3054 __u64 metadata_run_padding =
3055 ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING) ?
3056 (__u64)(METADATA_PADDING_SECTORS << SECTOR_SHIFT) :
3057 (__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS);
3058
3059 ic->metadata_run = round_up((__u64)ic->tag_size << (ic->sb->log2_interleave_sectors - ic->sb->log2_sectors_per_block),
3060 metadata_run_padding) >> SECTOR_SHIFT;
3061 if (!(ic->metadata_run & (ic->metadata_run - 1)))
3062 ic->log2_metadata_run = __ffs(ic->metadata_run);
3063 else
3064 ic->log2_metadata_run = -1;
3065
3066 get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset);
3067 last_sector = get_data_sector(ic, last_area, last_offset);
3068 if (last_sector < ic->start || last_sector >= ic->meta_device_sectors)
3069 return -EINVAL;
3070 } else {
3071 __u64 meta_size = (ic->provided_data_sectors >> ic->sb->log2_sectors_per_block) * ic->tag_size;
3072 meta_size = (meta_size + ((1U << (ic->log2_buffer_sectors + SECTOR_SHIFT)) - 1))
3073 >> (ic->log2_buffer_sectors + SECTOR_SHIFT);
3074 meta_size <<= ic->log2_buffer_sectors;
3075 if (ic->initial_sectors + meta_size < ic->initial_sectors ||
3076 ic->initial_sectors + meta_size > ic->meta_device_sectors)
3077 return -EINVAL;
3078 ic->metadata_run = 1;
3079 ic->log2_metadata_run = 0;
3080 }
3081
3082 return 0;
3083 }
3084
3085 static int initialize_superblock(struct dm_integrity_c *ic, unsigned journal_sectors, unsigned interleave_sectors)
3086 {
3087 unsigned journal_sections;
3088 int test_bit;
3089
3090 memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT);
3091 memcpy(ic->sb->magic, SB_MAGIC, 8);
3092 ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size);
3093 ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block);
3094 if (ic->journal_mac_alg.alg_string)
3095 ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC);
3096
3097 calculate_journal_section_size(ic);
3098 journal_sections = journal_sectors / ic->journal_section_sectors;
3099 if (!journal_sections)
3100 journal_sections = 1;
3101
3102 if (!ic->meta_dev) {
3103 if (ic->fix_padding)
3104 ic->sb->flags |= cpu_to_le32(SB_FLAG_FIXED_PADDING);
3105 ic->sb->journal_sections = cpu_to_le32(journal_sections);
3106 if (!interleave_sectors)
3107 interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
3108 ic->sb->log2_interleave_sectors = __fls(interleave_sectors);
3109 ic->sb->log2_interleave_sectors = max((__u8)MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3110 ic->sb->log2_interleave_sectors = min((__u8)MAX_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3111
3112 ic->provided_data_sectors = 0;
3113 for (test_bit = fls64(ic->meta_device_sectors) - 1; test_bit >= 3; test_bit--) {
3114 __u64 prev_data_sectors = ic->provided_data_sectors;
3115
3116 ic->provided_data_sectors |= (sector_t)1 << test_bit;
3117 if (calculate_device_limits(ic))
3118 ic->provided_data_sectors = prev_data_sectors;
3119 }
3120 if (!ic->provided_data_sectors)
3121 return -EINVAL;
3122 } else {
3123 ic->sb->log2_interleave_sectors = 0;
3124 ic->provided_data_sectors = ic->data_device_sectors;
3125 ic->provided_data_sectors &= ~(sector_t)(ic->sectors_per_block - 1);
3126
3127 try_smaller_buffer:
3128 ic->sb->journal_sections = cpu_to_le32(0);
3129 for (test_bit = fls(journal_sections) - 1; test_bit >= 0; test_bit--) {
3130 __u32 prev_journal_sections = le32_to_cpu(ic->sb->journal_sections);
3131 __u32 test_journal_sections = prev_journal_sections | (1U << test_bit);
3132 if (test_journal_sections > journal_sections)
3133 continue;
3134 ic->sb->journal_sections = cpu_to_le32(test_journal_sections);
3135 if (calculate_device_limits(ic))
3136 ic->sb->journal_sections = cpu_to_le32(prev_journal_sections);
3137
3138 }
3139 if (!le32_to_cpu(ic->sb->journal_sections)) {
3140 if (ic->log2_buffer_sectors > 3) {
3141 ic->log2_buffer_sectors--;
3142 goto try_smaller_buffer;
3143 }
3144 return -EINVAL;
3145 }
3146 }
3147
3148 ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
3149
3150 sb_set_version(ic);
3151
3152 return 0;
3153 }
3154
3155 static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic)
3156 {
3157 struct gendisk *disk = dm_disk(dm_table_get_md(ti->table));
3158 struct blk_integrity bi;
3159
3160 memset(&bi, 0, sizeof(bi));
3161 bi.profile = &dm_integrity_profile;
3162 bi.tuple_size = ic->tag_size;
3163 bi.tag_size = bi.tuple_size;
3164 bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT;
3165
3166 blk_integrity_register(disk, &bi);
3167 blk_queue_max_integrity_segments(disk->queue, UINT_MAX);
3168 }
3169
3170 static void dm_integrity_free_page_list(struct page_list *pl)
3171 {
3172 unsigned i;
3173
3174 if (!pl)
3175 return;
3176 for (i = 0; pl[i].page; i++)
3177 __free_page(pl[i].page);
3178 kvfree(pl);
3179 }
3180
3181 static struct page_list *dm_integrity_alloc_page_list(unsigned n_pages)
3182 {
3183 struct page_list *pl;
3184 unsigned i;
3185
3186 pl = kvmalloc_array(n_pages + 1, sizeof(struct page_list), GFP_KERNEL | __GFP_ZERO);
3187 if (!pl)
3188 return NULL;
3189
3190 for (i = 0; i < n_pages; i++) {
3191 pl[i].page = alloc_page(GFP_KERNEL);
3192 if (!pl[i].page) {
3193 dm_integrity_free_page_list(pl);
3194 return NULL;
3195 }
3196 if (i)
3197 pl[i - 1].next = &pl[i];
3198 }
3199 pl[i].page = NULL;
3200 pl[i].next = NULL;
3201
3202 return pl;
3203 }
3204
3205 static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl)
3206 {
3207 unsigned i;
3208 for (i = 0; i < ic->journal_sections; i++)
3209 kvfree(sl[i]);
3210 kvfree(sl);
3211 }
3212
3213 static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic,
3214 struct page_list *pl)
3215 {
3216 struct scatterlist **sl;
3217 unsigned i;
3218
3219 sl = kvmalloc_array(ic->journal_sections,
3220 sizeof(struct scatterlist *),
3221 GFP_KERNEL | __GFP_ZERO);
3222 if (!sl)
3223 return NULL;
3224
3225 for (i = 0; i < ic->journal_sections; i++) {
3226 struct scatterlist *s;
3227 unsigned start_index, start_offset;
3228 unsigned end_index, end_offset;
3229 unsigned n_pages;
3230 unsigned idx;
3231
3232 page_list_location(ic, i, 0, &start_index, &start_offset);
3233 page_list_location(ic, i, ic->journal_section_sectors - 1,
3234 &end_index, &end_offset);
3235
3236 n_pages = (end_index - start_index + 1);
3237
3238 s = kvmalloc_array(n_pages, sizeof(struct scatterlist),
3239 GFP_KERNEL);
3240 if (!s) {
3241 dm_integrity_free_journal_scatterlist(ic, sl);
3242 return NULL;
3243 }
3244
3245 sg_init_table(s, n_pages);
3246 for (idx = start_index; idx <= end_index; idx++) {
3247 char *va = lowmem_page_address(pl[idx].page);
3248 unsigned start = 0, end = PAGE_SIZE;
3249 if (idx == start_index)
3250 start = start_offset;
3251 if (idx == end_index)
3252 end = end_offset + (1 << SECTOR_SHIFT);
3253 sg_set_buf(&s[idx - start_index], va + start, end - start);
3254 }
3255
3256 sl[i] = s;
3257 }
3258
3259 return sl;
3260 }
3261
3262 static void free_alg(struct alg_spec *a)
3263 {
3264 kzfree(a->alg_string);
3265 kzfree(a->key);
3266 memset(a, 0, sizeof *a);
3267 }
3268
3269 static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval)
3270 {
3271 char *k;
3272
3273 free_alg(a);
3274
3275 a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL);
3276 if (!a->alg_string)
3277 goto nomem;
3278
3279 k = strchr(a->alg_string, ':');
3280 if (k) {
3281 *k = 0;
3282 a->key_string = k + 1;
3283 if (strlen(a->key_string) & 1)
3284 goto inval;
3285
3286 a->key_size = strlen(a->key_string) / 2;
3287 a->key = kmalloc(a->key_size, GFP_KERNEL);
3288 if (!a->key)
3289 goto nomem;
3290 if (hex2bin(a->key, a->key_string, a->key_size))
3291 goto inval;
3292 }
3293
3294 return 0;
3295 inval:
3296 *error = error_inval;
3297 return -EINVAL;
3298 nomem:
3299 *error = "Out of memory for an argument";
3300 return -ENOMEM;
3301 }
3302
3303 static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error,
3304 char *error_alg, char *error_key)
3305 {
3306 int r;
3307
3308 if (a->alg_string) {
3309 *hash = crypto_alloc_shash(a->alg_string, 0, 0);
3310 if (IS_ERR(*hash)) {
3311 *error = error_alg;
3312 r = PTR_ERR(*hash);
3313 *hash = NULL;
3314 return r;
3315 }
3316
3317 if (a->key) {
3318 r = crypto_shash_setkey(*hash, a->key, a->key_size);
3319 if (r) {
3320 *error = error_key;
3321 return r;
3322 }
3323 } else if (crypto_shash_get_flags(*hash) & CRYPTO_TFM_NEED_KEY) {
3324 *error = error_key;
3325 return -ENOKEY;
3326 }
3327 }
3328
3329 return 0;
3330 }
3331
3332 static int create_journal(struct dm_integrity_c *ic, char **error)
3333 {
3334 int r = 0;
3335 unsigned i;
3336 __u64 journal_pages, journal_desc_size, journal_tree_size;
3337 unsigned char *crypt_data = NULL, *crypt_iv = NULL;
3338 struct skcipher_request *req = NULL;
3339
3340 ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL);
3341 ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL);
3342 ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL);
3343 ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL);
3344
3345 journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
3346 PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
3347 journal_desc_size = journal_pages * sizeof(struct page_list);
3348 if (journal_pages >= totalram_pages() - totalhigh_pages() || journal_desc_size > ULONG_MAX) {
3349 *error = "Journal doesn't fit into memory";
3350 r = -ENOMEM;
3351 goto bad;
3352 }
3353 ic->journal_pages = journal_pages;
3354
3355 ic->journal = dm_integrity_alloc_page_list(ic->journal_pages);
3356 if (!ic->journal) {
3357 *error = "Could not allocate memory for journal";
3358 r = -ENOMEM;
3359 goto bad;
3360 }
3361 if (ic->journal_crypt_alg.alg_string) {
3362 unsigned ivsize, blocksize;
3363 struct journal_completion comp;
3364
3365 comp.ic = ic;
3366 ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, 0);
3367 if (IS_ERR(ic->journal_crypt)) {
3368 *error = "Invalid journal cipher";
3369 r = PTR_ERR(ic->journal_crypt);
3370 ic->journal_crypt = NULL;
3371 goto bad;
3372 }
3373 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
3374 blocksize = crypto_skcipher_blocksize(ic->journal_crypt);
3375
3376 if (ic->journal_crypt_alg.key) {
3377 r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key,
3378 ic->journal_crypt_alg.key_size);
3379 if (r) {
3380 *error = "Error setting encryption key";
3381 goto bad;
3382 }
3383 }
3384 DEBUG_print("cipher %s, block size %u iv size %u\n",
3385 ic->journal_crypt_alg.alg_string, blocksize, ivsize);
3386
3387 ic->journal_io = dm_integrity_alloc_page_list(ic->journal_pages);
3388 if (!ic->journal_io) {
3389 *error = "Could not allocate memory for journal io";
3390 r = -ENOMEM;
3391 goto bad;
3392 }
3393
3394 if (blocksize == 1) {
3395 struct scatterlist *sg;
3396
3397 req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3398 if (!req) {
3399 *error = "Could not allocate crypt request";
3400 r = -ENOMEM;
3401 goto bad;
3402 }
3403
3404 crypt_iv = kzalloc(ivsize, GFP_KERNEL);
3405 if (!crypt_iv) {
3406 *error = "Could not allocate iv";
3407 r = -ENOMEM;
3408 goto bad;
3409 }
3410
3411 ic->journal_xor = dm_integrity_alloc_page_list(ic->journal_pages);
3412 if (!ic->journal_xor) {
3413 *error = "Could not allocate memory for journal xor";
3414 r = -ENOMEM;
3415 goto bad;
3416 }
3417
3418 sg = kvmalloc_array(ic->journal_pages + 1,
3419 sizeof(struct scatterlist),
3420 GFP_KERNEL);
3421 if (!sg) {
3422 *error = "Unable to allocate sg list";
3423 r = -ENOMEM;
3424 goto bad;
3425 }
3426 sg_init_table(sg, ic->journal_pages + 1);
3427 for (i = 0; i < ic->journal_pages; i++) {
3428 char *va = lowmem_page_address(ic->journal_xor[i].page);
3429 clear_page(va);
3430 sg_set_buf(&sg[i], va, PAGE_SIZE);
3431 }
3432 sg_set_buf(&sg[i], &ic->commit_ids, sizeof ic->commit_ids);
3433
3434 skcipher_request_set_crypt(req, sg, sg,
3435 PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, crypt_iv);
3436 init_completion(&comp.comp);
3437 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3438 if (do_crypt(true, req, &comp))
3439 wait_for_completion(&comp.comp);
3440 kvfree(sg);
3441 r = dm_integrity_failed(ic);
3442 if (r) {
3443 *error = "Unable to encrypt journal";
3444 goto bad;
3445 }
3446 DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data");
3447
3448 crypto_free_skcipher(ic->journal_crypt);
3449 ic->journal_crypt = NULL;
3450 } else {
3451 unsigned crypt_len = roundup(ivsize, blocksize);
3452
3453 req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3454 if (!req) {
3455 *error = "Could not allocate crypt request";
3456 r = -ENOMEM;
3457 goto bad;
3458 }
3459
3460 crypt_iv = kmalloc(ivsize, GFP_KERNEL);
3461 if (!crypt_iv) {
3462 *error = "Could not allocate iv";
3463 r = -ENOMEM;
3464 goto bad;
3465 }
3466
3467 crypt_data = kmalloc(crypt_len, GFP_KERNEL);
3468 if (!crypt_data) {
3469 *error = "Unable to allocate crypt data";
3470 r = -ENOMEM;
3471 goto bad;
3472 }
3473
3474 ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal);
3475 if (!ic->journal_scatterlist) {
3476 *error = "Unable to allocate sg list";
3477 r = -ENOMEM;
3478 goto bad;
3479 }
3480 ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io);
3481 if (!ic->journal_io_scatterlist) {
3482 *error = "Unable to allocate sg list";
3483 r = -ENOMEM;
3484 goto bad;
3485 }
3486 ic->sk_requests = kvmalloc_array(ic->journal_sections,
3487 sizeof(struct skcipher_request *),
3488 GFP_KERNEL | __GFP_ZERO);
3489 if (!ic->sk_requests) {
3490 *error = "Unable to allocate sk requests";
3491 r = -ENOMEM;
3492 goto bad;
3493 }
3494 for (i = 0; i < ic->journal_sections; i++) {
3495 struct scatterlist sg;
3496 struct skcipher_request *section_req;
3497 __u32 section_le = cpu_to_le32(i);
3498
3499 memset(crypt_iv, 0x00, ivsize);
3500 memset(crypt_data, 0x00, crypt_len);
3501 memcpy(crypt_data, &section_le, min((size_t)crypt_len, sizeof(section_le)));
3502
3503 sg_init_one(&sg, crypt_data, crypt_len);
3504 skcipher_request_set_crypt(req, &sg, &sg, crypt_len, crypt_iv);
3505 init_completion(&comp.comp);
3506 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3507 if (do_crypt(true, req, &comp))
3508 wait_for_completion(&comp.comp);
3509
3510 r = dm_integrity_failed(ic);
3511 if (r) {
3512 *error = "Unable to generate iv";
3513 goto bad;
3514 }
3515
3516 section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3517 if (!section_req) {
3518 *error = "Unable to allocate crypt request";
3519 r = -ENOMEM;
3520 goto bad;
3521 }
3522 section_req->iv = kmalloc_array(ivsize, 2,
3523 GFP_KERNEL);
3524 if (!section_req->iv) {
3525 skcipher_request_free(section_req);
3526 *error = "Unable to allocate iv";
3527 r = -ENOMEM;
3528 goto bad;
3529 }
3530 memcpy(section_req->iv + ivsize, crypt_data, ivsize);
3531 section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT;
3532 ic->sk_requests[i] = section_req;
3533 DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i);
3534 }
3535 }
3536 }
3537
3538 for (i = 0; i < N_COMMIT_IDS; i++) {
3539 unsigned j;
3540 retest_commit_id:
3541 for (j = 0; j < i; j++) {
3542 if (ic->commit_ids[j] == ic->commit_ids[i]) {
3543 ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1);
3544 goto retest_commit_id;
3545 }
3546 }
3547 DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]);
3548 }
3549
3550 journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node);
3551 if (journal_tree_size > ULONG_MAX) {
3552 *error = "Journal doesn't fit into memory";
3553 r = -ENOMEM;
3554 goto bad;
3555 }
3556 ic->journal_tree = kvmalloc(journal_tree_size, GFP_KERNEL);
3557 if (!ic->journal_tree) {
3558 *error = "Could not allocate memory for journal tree";
3559 r = -ENOMEM;
3560 }
3561 bad:
3562 kfree(crypt_data);
3563 kfree(crypt_iv);
3564 skcipher_request_free(req);
3565
3566 return r;
3567 }
3568
3569 /*
3570 * Construct a integrity mapping
3571 *
3572 * Arguments:
3573 * device
3574 * offset from the start of the device
3575 * tag size
3576 * D - direct writes, J - journal writes, B - bitmap mode, R - recovery mode
3577 * number of optional arguments
3578 * optional arguments:
3579 * journal_sectors
3580 * interleave_sectors
3581 * buffer_sectors
3582 * journal_watermark
3583 * commit_time
3584 * meta_device
3585 * block_size
3586 * sectors_per_bit
3587 * bitmap_flush_interval
3588 * internal_hash
3589 * journal_crypt
3590 * journal_mac
3591 * recalculate
3592 */
3593 static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
3594 {
3595 struct dm_integrity_c *ic;
3596 char dummy;
3597 int r;
3598 unsigned extra_args;
3599 struct dm_arg_set as;
3600 static const struct dm_arg _args[] = {
3601 {0, 9, "Invalid number of feature args"},
3602 };
3603 unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
3604 bool should_write_sb;
3605 __u64 threshold;
3606 unsigned long long start;
3607 __s8 log2_sectors_per_bitmap_bit = -1;
3608 __s8 log2_blocks_per_bitmap_bit;
3609 __u64 bits_in_journal;
3610 __u64 n_bitmap_bits;
3611
3612 #define DIRECT_ARGUMENTS 4
3613
3614 if (argc <= DIRECT_ARGUMENTS) {
3615 ti->error = "Invalid argument count";
3616 return -EINVAL;
3617 }
3618
3619 ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL);
3620 if (!ic) {
3621 ti->error = "Cannot allocate integrity context";
3622 return -ENOMEM;
3623 }
3624 ti->private = ic;
3625 ti->per_io_data_size = sizeof(struct dm_integrity_io);
3626
3627 ic->in_progress = RB_ROOT;
3628 INIT_LIST_HEAD(&ic->wait_list);
3629 init_waitqueue_head(&ic->endio_wait);
3630 bio_list_init(&ic->flush_bio_list);
3631 init_waitqueue_head(&ic->copy_to_journal_wait);
3632 init_completion(&ic->crypto_backoff);
3633 atomic64_set(&ic->number_of_mismatches, 0);
3634 ic->bitmap_flush_interval = BITMAP_FLUSH_INTERVAL;
3635
3636 r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
3637 if (r) {
3638 ti->error = "Device lookup failed";
3639 goto bad;
3640 }
3641
3642 if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) {
3643 ti->error = "Invalid starting offset";
3644 r = -EINVAL;
3645 goto bad;
3646 }
3647 ic->start = start;
3648
3649 if (strcmp(argv[2], "-")) {
3650 if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) {
3651 ti->error = "Invalid tag size";
3652 r = -EINVAL;
3653 goto bad;
3654 }
3655 }
3656
3657 if (!strcmp(argv[3], "J") || !strcmp(argv[3], "B") ||
3658 !strcmp(argv[3], "D") || !strcmp(argv[3], "R")) {
3659 ic->mode = argv[3][0];
3660 } else {
3661 ti->error = "Invalid mode (expecting J, B, D, R)";
3662 r = -EINVAL;
3663 goto bad;
3664 }
3665
3666 journal_sectors = 0;
3667 interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
3668 buffer_sectors = DEFAULT_BUFFER_SECTORS;
3669 journal_watermark = DEFAULT_JOURNAL_WATERMARK;
3670 sync_msec = DEFAULT_SYNC_MSEC;
3671 ic->sectors_per_block = 1;
3672
3673 as.argc = argc - DIRECT_ARGUMENTS;
3674 as.argv = argv + DIRECT_ARGUMENTS;
3675 r = dm_read_arg_group(_args, &as, &extra_args, &ti->error);
3676 if (r)
3677 goto bad;
3678
3679 while (extra_args--) {
3680 const char *opt_string;
3681 unsigned val;
3682 unsigned long long llval;
3683 opt_string = dm_shift_arg(&as);
3684 if (!opt_string) {
3685 r = -EINVAL;
3686 ti->error = "Not enough feature arguments";
3687 goto bad;
3688 }
3689 if (sscanf(opt_string, "journal_sectors:%u%c", &val, &dummy) == 1)
3690 journal_sectors = val ? val : 1;
3691 else if (sscanf(opt_string, "interleave_sectors:%u%c", &val, &dummy) == 1)
3692 interleave_sectors = val;
3693 else if (sscanf(opt_string, "buffer_sectors:%u%c", &val, &dummy) == 1)
3694 buffer_sectors = val;
3695 else if (sscanf(opt_string, "journal_watermark:%u%c", &val, &dummy) == 1 && val <= 100)
3696 journal_watermark = val;
3697 else if (sscanf(opt_string, "commit_time:%u%c", &val, &dummy) == 1)
3698 sync_msec = val;
3699 else if (!strncmp(opt_string, "meta_device:", strlen("meta_device:"))) {
3700 if (ic->meta_dev) {
3701 dm_put_device(ti, ic->meta_dev);
3702 ic->meta_dev = NULL;
3703 }
3704 r = dm_get_device(ti, strchr(opt_string, ':') + 1,
3705 dm_table_get_mode(ti->table), &ic->meta_dev);
3706 if (r) {
3707 ti->error = "Device lookup failed";
3708 goto bad;
3709 }
3710 } else if (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) {
3711 if (val < 1 << SECTOR_SHIFT ||
3712 val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT ||
3713 (val & (val -1))) {
3714 r = -EINVAL;
3715 ti->error = "Invalid block_size argument";
3716 goto bad;
3717 }
3718 ic->sectors_per_block = val >> SECTOR_SHIFT;
3719 } else if (sscanf(opt_string, "sectors_per_bit:%llu%c", &llval, &dummy) == 1) {
3720 log2_sectors_per_bitmap_bit = !llval ? 0 : __ilog2_u64(llval);
3721 } else if (sscanf(opt_string, "bitmap_flush_interval:%u%c", &val, &dummy) == 1) {
3722 if (val >= (uint64_t)UINT_MAX * 1000 / HZ) {
3723 r = -EINVAL;
3724 ti->error = "Invalid bitmap_flush_interval argument";
3725 }
3726 ic->bitmap_flush_interval = msecs_to_jiffies(val);
3727 } else if (!strncmp(opt_string, "internal_hash:", strlen("internal_hash:"))) {
3728 r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error,
3729 "Invalid internal_hash argument");
3730 if (r)
3731 goto bad;
3732 } else if (!strncmp(opt_string, "journal_crypt:", strlen("journal_crypt:"))) {
3733 r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error,
3734 "Invalid journal_crypt argument");
3735 if (r)
3736 goto bad;
3737 } else if (!strncmp(opt_string, "journal_mac:", strlen("journal_mac:"))) {
3738 r = get_alg_and_key(opt_string, &ic->journal_mac_alg, &ti->error,
3739 "Invalid journal_mac argument");
3740 if (r)
3741 goto bad;
3742 } else if (!strcmp(opt_string, "recalculate")) {
3743 ic->recalculate_flag = true;
3744 } else if (!strcmp(opt_string, "fix_padding")) {
3745 ic->fix_padding = true;
3746 } else {
3747 r = -EINVAL;
3748 ti->error = "Invalid argument";
3749 goto bad;
3750 }
3751 }
3752
3753 ic->data_device_sectors = i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT;
3754 if (!ic->meta_dev)
3755 ic->meta_device_sectors = ic->data_device_sectors;
3756 else
3757 ic->meta_device_sectors = i_size_read(ic->meta_dev->bdev->bd_inode) >> SECTOR_SHIFT;
3758
3759 if (!journal_sectors) {
3760 journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS,
3761 ic->data_device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR);
3762 }
3763
3764 if (!buffer_sectors)
3765 buffer_sectors = 1;
3766 ic->log2_buffer_sectors = min((int)__fls(buffer_sectors), 31 - SECTOR_SHIFT);
3767
3768 r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error,
3769 "Invalid internal hash", "Error setting internal hash key");
3770 if (r)
3771 goto bad;
3772
3773 r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error,
3774 "Invalid journal mac", "Error setting journal mac key");
3775 if (r)
3776 goto bad;
3777
3778 if (!ic->tag_size) {
3779 if (!ic->internal_hash) {
3780 ti->error = "Unknown tag size";
3781 r = -EINVAL;
3782 goto bad;
3783 }
3784 ic->tag_size = crypto_shash_digestsize(ic->internal_hash);
3785 }
3786 if (ic->tag_size > MAX_TAG_SIZE) {
3787 ti->error = "Too big tag size";
3788 r = -EINVAL;
3789 goto bad;
3790 }
3791 if (!(ic->tag_size & (ic->tag_size - 1)))
3792 ic->log2_tag_size = __ffs(ic->tag_size);
3793 else
3794 ic->log2_tag_size = -1;
3795
3796 if (ic->mode == 'B' && !ic->internal_hash) {
3797 r = -EINVAL;
3798 ti->error = "Bitmap mode can be only used with internal hash";
3799 goto bad;
3800 }
3801
3802 ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
3803 ic->autocommit_msec = sync_msec;
3804 timer_setup(&ic->autocommit_timer, autocommit_fn, 0);
3805
3806 ic->io = dm_io_client_create();
3807 if (IS_ERR(ic->io)) {
3808 r = PTR_ERR(ic->io);
3809 ic->io = NULL;
3810 ti->error = "Cannot allocate dm io";
3811 goto bad;
3812 }
3813
3814 r = mempool_init_slab_pool(&ic->journal_io_mempool, JOURNAL_IO_MEMPOOL, journal_io_cache);
3815 if (r) {
3816 ti->error = "Cannot allocate mempool";
3817 goto bad;
3818 }
3819
3820 ic->metadata_wq = alloc_workqueue("dm-integrity-metadata",
3821 WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE);
3822 if (!ic->metadata_wq) {
3823 ti->error = "Cannot allocate workqueue";
3824 r = -ENOMEM;
3825 goto bad;
3826 }
3827
3828 /*
3829 * If this workqueue were percpu, it would cause bio reordering
3830 * and reduced performance.
3831 */
3832 ic->wait_wq = alloc_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3833 if (!ic->wait_wq) {
3834 ti->error = "Cannot allocate workqueue";
3835 r = -ENOMEM;
3836 goto bad;
3837 }
3838
3839 ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1);
3840 if (!ic->commit_wq) {
3841 ti->error = "Cannot allocate workqueue";
3842 r = -ENOMEM;
3843 goto bad;
3844 }
3845 INIT_WORK(&ic->commit_work, integrity_commit);
3846
3847 if (ic->mode == 'J' || ic->mode == 'B') {
3848 ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1);
3849 if (!ic->writer_wq) {
3850 ti->error = "Cannot allocate workqueue";
3851 r = -ENOMEM;
3852 goto bad;
3853 }
3854 INIT_WORK(&ic->writer_work, integrity_writer);
3855 }
3856
3857 ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL);
3858 if (!ic->sb) {
3859 r = -ENOMEM;
3860 ti->error = "Cannot allocate superblock area";
3861 goto bad;
3862 }
3863
3864 r = sync_rw_sb(ic, REQ_OP_READ, 0);
3865 if (r) {
3866 ti->error = "Error reading superblock";
3867 goto bad;
3868 }
3869 should_write_sb = false;
3870 if (memcmp(ic->sb->magic, SB_MAGIC, 8)) {
3871 if (ic->mode != 'R') {
3872 if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) {
3873 r = -EINVAL;
3874 ti->error = "The device is not initialized";
3875 goto bad;
3876 }
3877 }
3878
3879 r = initialize_superblock(ic, journal_sectors, interleave_sectors);
3880 if (r) {
3881 ti->error = "Could not initialize superblock";
3882 goto bad;
3883 }
3884 if (ic->mode != 'R')
3885 should_write_sb = true;
3886 }
3887
3888 if (!ic->sb->version || ic->sb->version > SB_VERSION_4) {
3889 r = -EINVAL;
3890 ti->error = "Unknown version";
3891 goto bad;
3892 }
3893 if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) {
3894 r = -EINVAL;
3895 ti->error = "Tag size doesn't match the information in superblock";
3896 goto bad;
3897 }
3898 if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) {
3899 r = -EINVAL;
3900 ti->error = "Block size doesn't match the information in superblock";
3901 goto bad;
3902 }
3903 if (!le32_to_cpu(ic->sb->journal_sections)) {
3904 r = -EINVAL;
3905 ti->error = "Corrupted superblock, journal_sections is 0";
3906 goto bad;
3907 }
3908 /* make sure that ti->max_io_len doesn't overflow */
3909 if (!ic->meta_dev) {
3910 if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS ||
3911 ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) {
3912 r = -EINVAL;
3913 ti->error = "Invalid interleave_sectors in the superblock";
3914 goto bad;
3915 }
3916 } else {
3917 if (ic->sb->log2_interleave_sectors) {
3918 r = -EINVAL;
3919 ti->error = "Invalid interleave_sectors in the superblock";
3920 goto bad;
3921 }
3922 }
3923 ic->provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
3924 if (ic->provided_data_sectors != le64_to_cpu(ic->sb->provided_data_sectors)) {
3925 /* test for overflow */
3926 r = -EINVAL;
3927 ti->error = "The superblock has 64-bit device size, but the kernel was compiled with 32-bit sectors";
3928 goto bad;
3929 }
3930 if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
3931 r = -EINVAL;
3932 ti->error = "Journal mac mismatch";
3933 goto bad;
3934 }
3935
3936 try_smaller_buffer:
3937 r = calculate_device_limits(ic);
3938 if (r) {
3939 if (ic->meta_dev) {
3940 if (ic->log2_buffer_sectors > 3) {
3941 ic->log2_buffer_sectors--;
3942 goto try_smaller_buffer;
3943 }
3944 }
3945 ti->error = "The device is too small";
3946 goto bad;
3947 }
3948
3949 if (log2_sectors_per_bitmap_bit < 0)
3950 log2_sectors_per_bitmap_bit = __fls(DEFAULT_SECTORS_PER_BITMAP_BIT);
3951 if (log2_sectors_per_bitmap_bit < ic->sb->log2_sectors_per_block)
3952 log2_sectors_per_bitmap_bit = ic->sb->log2_sectors_per_block;
3953
3954 bits_in_journal = ((__u64)ic->journal_section_sectors * ic->journal_sections) << (SECTOR_SHIFT + 3);
3955 if (bits_in_journal > UINT_MAX)
3956 bits_in_journal = UINT_MAX;
3957 while (bits_in_journal < (ic->provided_data_sectors + ((sector_t)1 << log2_sectors_per_bitmap_bit) - 1) >> log2_sectors_per_bitmap_bit)
3958 log2_sectors_per_bitmap_bit++;
3959
3960 log2_blocks_per_bitmap_bit = log2_sectors_per_bitmap_bit - ic->sb->log2_sectors_per_block;
3961 ic->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
3962 if (should_write_sb) {
3963 ic->sb->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
3964 }
3965 n_bitmap_bits = ((ic->provided_data_sectors >> ic->sb->log2_sectors_per_block)
3966 + (((sector_t)1 << log2_blocks_per_bitmap_bit) - 1)) >> log2_blocks_per_bitmap_bit;
3967 ic->n_bitmap_blocks = DIV_ROUND_UP(n_bitmap_bits, BITMAP_BLOCK_SIZE * 8);
3968
3969 if (!ic->meta_dev)
3970 ic->log2_buffer_sectors = min(ic->log2_buffer_sectors, (__u8)__ffs(ic->metadata_run));
3971
3972 if (ti->len > ic->provided_data_sectors) {
3973 r = -EINVAL;
3974 ti->error = "Not enough provided sectors for requested mapping size";
3975 goto bad;
3976 }
3977
3978
3979 threshold = (__u64)ic->journal_entries * (100 - journal_watermark);
3980 threshold += 50;
3981 do_div(threshold, 100);
3982 ic->free_sectors_threshold = threshold;
3983
3984 DEBUG_print("initialized:\n");
3985 DEBUG_print(" integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size));
3986 DEBUG_print(" journal_entry_size %u\n", ic->journal_entry_size);
3987 DEBUG_print(" journal_entries_per_sector %u\n", ic->journal_entries_per_sector);
3988 DEBUG_print(" journal_section_entries %u\n", ic->journal_section_entries);
3989 DEBUG_print(" journal_section_sectors %u\n", ic->journal_section_sectors);
3990 DEBUG_print(" journal_sections %u\n", (unsigned)le32_to_cpu(ic->sb->journal_sections));
3991 DEBUG_print(" journal_entries %u\n", ic->journal_entries);
3992 DEBUG_print(" log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors);
3993 DEBUG_print(" data_device_sectors 0x%llx\n", i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT);
3994 DEBUG_print(" initial_sectors 0x%x\n", ic->initial_sectors);
3995 DEBUG_print(" metadata_run 0x%x\n", ic->metadata_run);
3996 DEBUG_print(" log2_metadata_run %d\n", ic->log2_metadata_run);
3997 DEBUG_print(" provided_data_sectors 0x%llx (%llu)\n", (unsigned long long)ic->provided_data_sectors,
3998 (unsigned long long)ic->provided_data_sectors);
3999 DEBUG_print(" log2_buffer_sectors %u\n", ic->log2_buffer_sectors);
4000 DEBUG_print(" bits_in_journal %llu\n", (unsigned long long)bits_in_journal);
4001
4002 if (ic->recalculate_flag && !(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))) {
4003 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
4004 ic->sb->recalc_sector = cpu_to_le64(0);
4005 }
4006
4007 if (ic->internal_hash) {
4008 ic->recalc_wq = alloc_workqueue("dm-integrity-recalc", WQ_MEM_RECLAIM, 1);
4009 if (!ic->recalc_wq ) {
4010 ti->error = "Cannot allocate workqueue";
4011 r = -ENOMEM;
4012 goto bad;
4013 }
4014 INIT_WORK(&ic->recalc_work, integrity_recalc);
4015 ic->recalc_buffer = vmalloc(RECALC_SECTORS << SECTOR_SHIFT);
4016 if (!ic->recalc_buffer) {
4017 ti->error = "Cannot allocate buffer for recalculating";
4018 r = -ENOMEM;
4019 goto bad;
4020 }
4021 ic->recalc_tags = kvmalloc_array(RECALC_SECTORS >> ic->sb->log2_sectors_per_block,
4022 ic->tag_size, GFP_KERNEL);
4023 if (!ic->recalc_tags) {
4024 ti->error = "Cannot allocate tags for recalculating";
4025 r = -ENOMEM;
4026 goto bad;
4027 }
4028 }
4029
4030 ic->bufio = dm_bufio_client_create(ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev,
4031 1U << (SECTOR_SHIFT + ic->log2_buffer_sectors), 1, 0, NULL, NULL);
4032 if (IS_ERR(ic->bufio)) {
4033 r = PTR_ERR(ic->bufio);
4034 ti->error = "Cannot initialize dm-bufio";
4035 ic->bufio = NULL;
4036 goto bad;
4037 }
4038 dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors);
4039
4040 if (ic->mode != 'R') {
4041 r = create_journal(ic, &ti->error);
4042 if (r)
4043 goto bad;
4044
4045 }
4046
4047 if (ic->mode == 'B') {
4048 unsigned i;
4049 unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
4050
4051 ic->recalc_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4052 if (!ic->recalc_bitmap) {
4053 r = -ENOMEM;
4054 goto bad;
4055 }
4056 ic->may_write_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4057 if (!ic->may_write_bitmap) {
4058 r = -ENOMEM;
4059 goto bad;
4060 }
4061 ic->bbs = kvmalloc_array(ic->n_bitmap_blocks, sizeof(struct bitmap_block_status), GFP_KERNEL);
4062 if (!ic->bbs) {
4063 r = -ENOMEM;
4064 goto bad;
4065 }
4066 INIT_DELAYED_WORK(&ic->bitmap_flush_work, bitmap_flush_work);
4067 for (i = 0; i < ic->n_bitmap_blocks; i++) {
4068 struct bitmap_block_status *bbs = &ic->bbs[i];
4069 unsigned sector, pl_index, pl_offset;
4070
4071 INIT_WORK(&bbs->work, bitmap_block_work);
4072 bbs->ic = ic;
4073 bbs->idx = i;
4074 bio_list_init(&bbs->bio_queue);
4075 spin_lock_init(&bbs->bio_queue_lock);
4076
4077 sector = i * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT);
4078 pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
4079 pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
4080
4081 bbs->bitmap = lowmem_page_address(ic->journal[pl_index].page) + pl_offset;
4082 }
4083 }
4084
4085 if (should_write_sb) {
4086 int r;
4087
4088 init_journal(ic, 0, ic->journal_sections, 0);
4089 r = dm_integrity_failed(ic);
4090 if (unlikely(r)) {
4091 ti->error = "Error initializing journal";
4092 goto bad;
4093 }
4094 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
4095 if (r) {
4096 ti->error = "Error initializing superblock";
4097 goto bad;
4098 }
4099 ic->just_formatted = true;
4100 }
4101
4102 if (!ic->meta_dev) {
4103 r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors);
4104 if (r)
4105 goto bad;
4106 }
4107 if (ic->mode == 'B') {
4108 unsigned max_io_len = ((sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit) * (BITMAP_BLOCK_SIZE * 8);
4109 if (!max_io_len)
4110 max_io_len = 1U << 31;
4111 DEBUG_print("max_io_len: old %u, new %u\n", ti->max_io_len, max_io_len);
4112 if (!ti->max_io_len || ti->max_io_len > max_io_len) {
4113 r = dm_set_target_max_io_len(ti, max_io_len);
4114 if (r)
4115 goto bad;
4116 }
4117 }
4118
4119 if (!ic->internal_hash)
4120 dm_integrity_set(ti, ic);
4121
4122 ti->num_flush_bios = 1;
4123 ti->flush_supported = true;
4124
4125 return 0;
4126
4127 bad:
4128 dm_integrity_dtr(ti);
4129 return r;
4130 }
4131
4132 static void dm_integrity_dtr(struct dm_target *ti)
4133 {
4134 struct dm_integrity_c *ic = ti->private;
4135
4136 BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
4137 BUG_ON(!list_empty(&ic->wait_list));
4138
4139 if (ic->metadata_wq)
4140 destroy_workqueue(ic->metadata_wq);
4141 if (ic->wait_wq)
4142 destroy_workqueue(ic->wait_wq);
4143 if (ic->commit_wq)
4144 destroy_workqueue(ic->commit_wq);
4145 if (ic->writer_wq)
4146 destroy_workqueue(ic->writer_wq);
4147 if (ic->recalc_wq)
4148 destroy_workqueue(ic->recalc_wq);
4149 vfree(ic->recalc_buffer);
4150 kvfree(ic->recalc_tags);
4151 kvfree(ic->bbs);
4152 if (ic->bufio)
4153 dm_bufio_client_destroy(ic->bufio);
4154 mempool_exit(&ic->journal_io_mempool);
4155 if (ic->io)
4156 dm_io_client_destroy(ic->io);
4157 if (ic->dev)
4158 dm_put_device(ti, ic->dev);
4159 if (ic->meta_dev)
4160 dm_put_device(ti, ic->meta_dev);
4161 dm_integrity_free_page_list(ic->journal);
4162 dm_integrity_free_page_list(ic->journal_io);
4163 dm_integrity_free_page_list(ic->journal_xor);
4164 dm_integrity_free_page_list(ic->recalc_bitmap);
4165 dm_integrity_free_page_list(ic->may_write_bitmap);
4166 if (ic->journal_scatterlist)
4167 dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist);
4168 if (ic->journal_io_scatterlist)
4169 dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist);
4170 if (ic->sk_requests) {
4171 unsigned i;
4172
4173 for (i = 0; i < ic->journal_sections; i++) {
4174 struct skcipher_request *req = ic->sk_requests[i];
4175 if (req) {
4176 kzfree(req->iv);
4177 skcipher_request_free(req);
4178 }
4179 }
4180 kvfree(ic->sk_requests);
4181 }
4182 kvfree(ic->journal_tree);
4183 if (ic->sb)
4184 free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT);
4185
4186 if (ic->internal_hash)
4187 crypto_free_shash(ic->internal_hash);
4188 free_alg(&ic->internal_hash_alg);
4189
4190 if (ic->journal_crypt)
4191 crypto_free_skcipher(ic->journal_crypt);
4192 free_alg(&ic->journal_crypt_alg);
4193
4194 if (ic->journal_mac)
4195 crypto_free_shash(ic->journal_mac);
4196 free_alg(&ic->journal_mac_alg);
4197
4198 kfree(ic);
4199 }
4200
4201 static struct target_type integrity_target = {
4202 .name = "integrity",
4203 .version = {1, 4, 0},
4204 .module = THIS_MODULE,
4205 .features = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
4206 .ctr = dm_integrity_ctr,
4207 .dtr = dm_integrity_dtr,
4208 .map = dm_integrity_map,
4209 .postsuspend = dm_integrity_postsuspend,
4210 .resume = dm_integrity_resume,
4211 .status = dm_integrity_status,
4212 .iterate_devices = dm_integrity_iterate_devices,
4213 .io_hints = dm_integrity_io_hints,
4214 };
4215
4216 static int __init dm_integrity_init(void)
4217 {
4218 int r;
4219
4220 journal_io_cache = kmem_cache_create("integrity_journal_io",
4221 sizeof(struct journal_io), 0, 0, NULL);
4222 if (!journal_io_cache) {
4223 DMERR("can't allocate journal io cache");
4224 return -ENOMEM;
4225 }
4226
4227 r = dm_register_target(&integrity_target);
4228
4229 if (r < 0)
4230 DMERR("register failed %d", r);
4231
4232 return r;
4233 }
4234
4235 static void __exit dm_integrity_exit(void)
4236 {
4237 dm_unregister_target(&integrity_target);
4238 kmem_cache_destroy(journal_io_cache);
4239 }
4240
4241 module_init(dm_integrity_init);
4242 module_exit(dm_integrity_exit);
4243
4244 MODULE_AUTHOR("Milan Broz");
4245 MODULE_AUTHOR("Mikulas Patocka");
4246 MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension");
4247 MODULE_LICENSE("GPL");
Linux with added FPC-III support