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dm persistent data: fix return type of shadow_root()
[linux-block.git] / drivers / md / dm-integrity.c
CommitLineData
7eada909
MP		 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
248aa264
MS		 9#include "dm-bio-record.h"
10
d3e632f0 11#include <linux/compiler.h>
7eada909
MP		 12#include <linux/module.h>
13#include <linux/device-mapper.h>
14#include <linux/dm-io.h>
15#include <linux/vmalloc.h>
16#include <linux/sort.h>
17#include <linux/rbtree.h>
18#include <linux/delay.h>
19#include <linux/random.h>
1f5a7759 20#include <linux/reboot.h>
7eada909
MP		 21#include <crypto/hash.h>
22#include <crypto/skcipher.h>
23#include <linux/async_tx.h>
afa53df8 24#include <linux/dm-bufio.h>
7eada909
MP		 25
26#define DM_MSG_PREFIX "integrity"
27
28#define DEFAULT_INTERLEAVE_SECTORS 32768
29#define DEFAULT_JOURNAL_SIZE_FACTOR 7
468dfca3 30#define DEFAULT_SECTORS_PER_BITMAP_BIT 32768
7eada909
MP		 31#define DEFAULT_BUFFER_SECTORS 128
32#define DEFAULT_JOURNAL_WATERMARK 50
33#define DEFAULT_SYNC_MSEC 10000
34#define DEFAULT_MAX_JOURNAL_SECTORS 131072
56b67a4f
MP		 35#define MIN_LOG2_INTERLEAVE_SECTORS 3
36#define MAX_LOG2_INTERLEAVE_SECTORS 31
7eada909 37#define METADATA_WORKQUEUE_MAX_ACTIVE 16
a3fcf725
MP		 38#define RECALC_SECTORS 8192
39#define RECALC_WRITE_SUPER 16
468dfca3
MP		 40#define BITMAP_BLOCK_SIZE 4096 /* don't change it */
41#define BITMAP_FLUSH_INTERVAL (10 * HZ)
84597a44 42#define DISCARD_FILLER 0xf6
7eada909
MP		 43
44/*
45 * Warning - DEBUG_PRINT prints security-sensitive data to the log,
46 * so it should not be enabled in the official kernel
47 */
48//#define DEBUG_PRINT
49//#define INTERNAL_VERIFY
50
51/*
52 * On disk structures
53 */
54
55#define SB_MAGIC "integrt"
1f9fc0b8
MP		 56#define SB_VERSION_1 1
57#define SB_VERSION_2 2
468dfca3 58#define SB_VERSION_3 3
d537858a 59#define SB_VERSION_4 4
7eada909 60#define SB_SECTORS 8
9d609f85 61#define MAX_SECTORS_PER_BLOCK 8
7eada909
MP		 62
63struct superblock {
64 __u8 magic[8];
65 __u8 version;
66 __u8 log2_interleave_sectors;
67 __u16 integrity_tag_size;
68 __u32 journal_sections;
69 __u64 provided_data_sectors; /* userspace uses this value */
70 __u32 flags;
9d609f85 71 __u8 log2_sectors_per_block;
468dfca3
MP		 72 __u8 log2_blocks_per_bitmap_bit;
73 __u8 pad[2];
a3fcf725 74 __u64 recalc_sector;
7eada909
MP		 75};
76
77#define SB_FLAG_HAVE_JOURNAL_MAC 0x1
a3fcf725 78#define SB_FLAG_RECALCULATING 0x2
468dfca3 79#define SB_FLAG_DIRTY_BITMAP 0x4
d537858a 80#define SB_FLAG_FIXED_PADDING 0x8
7eada909
MP		 81
82#define JOURNAL_ENTRY_ROUNDUP 8
83
84typedef __u64 commit_id_t;
85#define JOURNAL_MAC_PER_SECTOR 8
86
87struct journal_entry {
88 union {
89 struct {
90 __u32 sector_lo;
91 __u32 sector_hi;
92 } s;
93 __u64 sector;
94 } u;
b18ae8dd 95 commit_id_t last_bytes[];
9d609f85 96 /* __u8 tag[0]; */
7eada909
MP		 97};
98
9d609f85
MP		 99#define journal_entry_tag(ic, je) ((__u8 *)&(je)->last_bytes[(ic)->sectors_per_block])
100
7eada909 101#if BITS_PER_LONG == 64
d3e632f0 102#define journal_entry_set_sector(je, x) do { smp_wmb(); WRITE_ONCE((je)->u.sector, cpu_to_le64(x)); } while (0)
7eada909 103#else
72deb455 104#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)
7eada909 105#endif
72deb455 106#define journal_entry_get_sector(je) le64_to_cpu((je)->u.sector)
7eada909
MP		 107#define journal_entry_is_unused(je) ((je)->u.s.sector_hi == cpu_to_le32(-1))
108#define journal_entry_set_unused(je) do { ((je)->u.s.sector_hi = cpu_to_le32(-1)); } while (0)
109#define journal_entry_is_inprogress(je) ((je)->u.s.sector_hi == cpu_to_le32(-2))
110#define journal_entry_set_inprogress(je) do { ((je)->u.s.sector_hi = cpu_to_le32(-2)); } while (0)
111
112#define JOURNAL_BLOCK_SECTORS 8
113#define JOURNAL_SECTOR_DATA ((1 << SECTOR_SHIFT) - sizeof(commit_id_t))
114#define JOURNAL_MAC_SIZE (JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS)
115
116struct journal_sector {
117 __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR];
118 __u8 mac[JOURNAL_MAC_PER_SECTOR];
119 commit_id_t commit_id;
120};
121
9d609f85 122#define MAX_TAG_SIZE (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
7eada909
MP		 123
124#define METADATA_PADDING_SECTORS 8
125
126#define N_COMMIT_IDS 4
127
128static unsigned char prev_commit_seq(unsigned char seq)
129{
130 return (seq + N_COMMIT_IDS - 1) % N_COMMIT_IDS;
131}
132
133static unsigned char next_commit_seq(unsigned char seq)
134{
135 return (seq + 1) % N_COMMIT_IDS;
136}
137
138/*
139 * In-memory structures
140 */
141
142struct journal_node {
143 struct rb_node node;
144 sector_t sector;
145};
146
147struct alg_spec {
148 char *alg_string;
149 char *key_string;
150 __u8 *key;
151 unsigned key_size;
152};
153
154struct dm_integrity_c {
155 struct dm_dev *dev;
356d9d52 156 struct dm_dev *meta_dev;
7eada909
MP		 157 unsigned tag_size;
158 __s8 log2_tag_size;
159 sector_t start;
6f1c819c 160 mempool_t journal_io_mempool;
7eada909
MP		 161 struct dm_io_client *io;
162 struct dm_bufio_client *bufio;
163 struct workqueue_struct *metadata_wq;
164 struct superblock *sb;
165 unsigned journal_pages;
468dfca3
MP		 166 unsigned n_bitmap_blocks;
167
7eada909
MP		 168 struct page_list *journal;
169 struct page_list *journal_io;
170 struct page_list *journal_xor;
468dfca3
MP		 171 struct page_list *recalc_bitmap;
172 struct page_list *may_write_bitmap;
173 struct bitmap_block_status *bbs;
174 unsigned bitmap_flush_interval;
48271493
MP		 175 int synchronous_mode;
176 struct bio_list synchronous_bios;
468dfca3 177 struct delayed_work bitmap_flush_work;
7eada909
MP		 178
179 struct crypto_skcipher *journal_crypt;
180 struct scatterlist **journal_scatterlist;
181 struct scatterlist **journal_io_scatterlist;
182 struct skcipher_request **sk_requests;
183
184 struct crypto_shash *journal_mac;
185
186 struct journal_node *journal_tree;
187 struct rb_root journal_tree_root;
188
189 sector_t provided_data_sectors;
190
191 unsigned short journal_entry_size;
192 unsigned char journal_entries_per_sector;
193 unsigned char journal_section_entries;
9d609f85 194 unsigned short journal_section_sectors;
7eada909
MP		 195 unsigned journal_sections;
196 unsigned journal_entries;
356d9d52
MP		 197 sector_t data_device_sectors;
198 sector_t meta_device_sectors;
7eada909
MP		 199 unsigned initial_sectors;
200 unsigned metadata_run;
201 __s8 log2_metadata_run;
202 __u8 log2_buffer_sectors;
9d609f85 203 __u8 sectors_per_block;
468dfca3 204 __u8 log2_blocks_per_bitmap_bit;
7eada909
MP		 205
206 unsigned char mode;
7eada909
MP		 207
208 int failed;
209
210 struct crypto_shash *internal_hash;
211
adc0daad
MP		 212 struct dm_target *ti;
213
7eada909
MP		 214 /* these variables are locked with endio_wait.lock */
215 struct rb_root in_progress;
724376a0 216 struct list_head wait_list;
7eada909
MP		 217 wait_queue_head_t endio_wait;
218 struct workqueue_struct *wait_wq;
53770f0e 219 struct workqueue_struct *offload_wq;
7eada909
MP		 220
221 unsigned char commit_seq;
222 commit_id_t commit_ids[N_COMMIT_IDS];
223
224 unsigned committed_section;
225 unsigned n_committed_sections;
226
227 unsigned uncommitted_section;
228 unsigned n_uncommitted_sections;
229
230 unsigned free_section;
231 unsigned char free_section_entry;
232 unsigned free_sectors;
233
234 unsigned free_sectors_threshold;
235
236 struct workqueue_struct *commit_wq;
237 struct work_struct commit_work;
238
239 struct workqueue_struct *writer_wq;
240 struct work_struct writer_work;
241
a3fcf725
MP		 242 struct workqueue_struct *recalc_wq;
243 struct work_struct recalc_work;
244 u8 *recalc_buffer;
245 u8 *recalc_tags;
246
7eada909
MP		 247 struct bio_list flush_bio_list;
248
249 unsigned long autocommit_jiffies;
250 struct timer_list autocommit_timer;
251 unsigned autocommit_msec;
252
253 wait_queue_head_t copy_to_journal_wait;
254
255 struct completion crypto_backoff;
256
257 bool journal_uptodate;
258 bool just_formatted;
468dfca3 259 bool recalculate_flag;
84597a44 260 bool discard;
5c024064
MP		 261 bool fix_padding;
262 bool legacy_recalculate;
7eada909
MP		 263
264 struct alg_spec internal_hash_alg;
265 struct alg_spec journal_crypt_alg;
266 struct alg_spec journal_mac_alg;
3f2e5393
MP		 267
268 atomic64_t number_of_mismatches;
1f5a7759
MP		 269
270 struct notifier_block reboot_notifier;
7eada909
MP		 271};
272
273struct dm_integrity_range {
274 sector_t logical_sector;
4f43446d 275 sector_t n_sectors;
724376a0
MP		 276 bool waiting;
277 union {
278 struct rb_node node;
279 struct {
280 struct task_struct *task;
281 struct list_head wait_entry;
282 };
283 };
7eada909
MP		 284};
285
286struct dm_integrity_io {
287 struct work_struct work;
288
289 struct dm_integrity_c *ic;
84597a44 290 enum req_opf op;
7eada909
MP		 291 bool fua;
292
293 struct dm_integrity_range range;
294
295 sector_t metadata_block;
296 unsigned metadata_offset;
297
298 atomic_t in_flight;
4e4cbee9 299 blk_status_t bi_status;
7eada909
MP		 300
301 struct completion *completion;
302
248aa264 303 struct dm_bio_details bio_details;
7eada909
MP		 304};
305
306struct journal_completion {
307 struct dm_integrity_c *ic;
308 atomic_t in_flight;
309 struct completion comp;
310};
311
312struct journal_io {
313 struct dm_integrity_range range;
314 struct journal_completion *comp;
315};
316
468dfca3
MP		 317struct bitmap_block_status {
318 struct work_struct work;
319 struct dm_integrity_c *ic;
320 unsigned idx;
321 unsigned long *bitmap;
322 struct bio_list bio_queue;
323 spinlock_t bio_queue_lock;
324
325};
326
7eada909
MP		 327static struct kmem_cache *journal_io_cache;
328
329#define JOURNAL_IO_MEMPOOL 32
330
331#ifdef DEBUG_PRINT
332#define DEBUG_print(x, ...) printk(KERN_DEBUG x, ##__VA_ARGS__)
333static void __DEBUG_bytes(__u8 *bytes, size_t len, const char *msg, ...)
334{
335 va_list args;
336 va_start(args, msg);
337 vprintk(msg, args);
338 va_end(args);
339 if (len)
340 pr_cont(":");
341 while (len) {
342 pr_cont(" %02x", *bytes);
343 bytes++;
344 len--;
345 }
346 pr_cont("\n");
347}
348#define DEBUG_bytes(bytes, len, msg, ...) __DEBUG_bytes(bytes, len, KERN_DEBUG msg, ##__VA_ARGS__)
349#else
350#define DEBUG_print(x, ...) do { } while (0)
351#define DEBUG_bytes(bytes, len, msg, ...) do { } while (0)
352#endif
353
54d4e6ab
MG		 354static void dm_integrity_prepare(struct request *rq)
355{
356}
357
358static void dm_integrity_complete(struct request *rq, unsigned int nr_bytes)
359{
360}
361
7eada909
MP		 362/*
363 * DM Integrity profile, protection is performed layer above (dm-crypt)
364 */
7c373d66 365static const struct blk_integrity_profile dm_integrity_profile = {
7eada909
MP		 366 .name = "DM-DIF-EXT-TAG",
367 .generate_fn = NULL,
368 .verify_fn = NULL,
54d4e6ab
MG		 369 .prepare_fn = dm_integrity_prepare,
370 .complete_fn = dm_integrity_complete,
7eada909
MP		 371};
372
373static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map);
374static void integrity_bio_wait(struct work_struct *w);
375static void dm_integrity_dtr(struct dm_target *ti);
376
377static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err)
378{
3f2e5393
MP		 379 if (err == -EILSEQ)
380 atomic64_inc(&ic->number_of_mismatches);
7eada909
MP		 381 if (!cmpxchg(&ic->failed, 0, err))
382 DMERR("Error on %s: %d", msg, err);
383}
384
385static int dm_integrity_failed(struct dm_integrity_c *ic)
386{
d3e632f0 387 return READ_ONCE(ic->failed);
7eada909
MP		 388}
389
5c024064
MP		 390static bool dm_integrity_disable_recalculate(struct dm_integrity_c *ic)
391{
392 if ((ic->internal_hash_alg.key || ic->journal_mac_alg.key) &&
393 !ic->legacy_recalculate)
394 return true;
395 return false;
396}
397
7eada909
MP		 398static commit_id_t dm_integrity_commit_id(struct dm_integrity_c *ic, unsigned i,
399 unsigned j, unsigned char seq)
400{
401 /*
402 * Xor the number with section and sector, so that if a piece of
403 * journal is written at wrong place, it is detected.
404 */
405 return ic->commit_ids[seq] ^ cpu_to_le64(((__u64)i << 32) ^ j);
406}
407
408static void get_area_and_offset(struct dm_integrity_c *ic, sector_t data_sector,
409 sector_t *area, sector_t *offset)
410{
356d9d52
MP		 411 if (!ic->meta_dev) {
412 __u8 log2_interleave_sectors = ic->sb->log2_interleave_sectors;
413 *area = data_sector >> log2_interleave_sectors;
414 *offset = (unsigned)data_sector & ((1U << log2_interleave_sectors) - 1);
415 } else {
416 *area = 0;
417 *offset = data_sector;
418 }
7eada909
MP		 419}
420
9d609f85
MP		 421#define sector_to_block(ic, n) \
422do { \
423 BUG_ON((n) & (unsigned)((ic)->sectors_per_block - 1)); \
424 (n) >>= (ic)->sb->log2_sectors_per_block; \
425} while (0)
426
7eada909
MP		 427static __u64 get_metadata_sector_and_offset(struct dm_integrity_c *ic, sector_t area,
428 sector_t offset, unsigned *metadata_offset)
429{
430 __u64 ms;
431 unsigned mo;
432
433 ms = area << ic->sb->log2_interleave_sectors;
434 if (likely(ic->log2_metadata_run >= 0))
435 ms += area << ic->log2_metadata_run;
436 else
437 ms += area * ic->metadata_run;
438 ms >>= ic->log2_buffer_sectors;
439
9d609f85
MP		 440 sector_to_block(ic, offset);
441
7eada909
MP		 442 if (likely(ic->log2_tag_size >= 0)) {
443 ms += offset >> (SECTOR_SHIFT + ic->log2_buffer_sectors - ic->log2_tag_size);
444 mo = (offset << ic->log2_tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
445 } else {
446 ms += (__u64)offset * ic->tag_size >> (SECTOR_SHIFT + ic->log2_buffer_sectors);
447 mo = (offset * ic->tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
448 }
449 *metadata_offset = mo;
450 return ms;
451}
452
453static sector_t get_data_sector(struct dm_integrity_c *ic, sector_t area, sector_t offset)
454{
455 sector_t result;
456
356d9d52
MP		 457 if (ic->meta_dev)
458 return offset;
459
7eada909
MP		 460 result = area << ic->sb->log2_interleave_sectors;
461 if (likely(ic->log2_metadata_run >= 0))
462 result += (area + 1) << ic->log2_metadata_run;
463 else
464 result += (area + 1) * ic->metadata_run;
465
466 result += (sector_t)ic->initial_sectors + offset;
71e9ddbc
MP		 467 result += ic->start;
468
7eada909
MP		 469 return result;
470}
471
472static void wraparound_section(struct dm_integrity_c *ic, unsigned *sec_ptr)
473{
474 if (unlikely(*sec_ptr >= ic->journal_sections))
475 *sec_ptr -= ic->journal_sections;
476}
477
1f9fc0b8
MP		 478static void sb_set_version(struct dm_integrity_c *ic)
479{
d537858a
MP		 480 if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING))
481 ic->sb->version = SB_VERSION_4;
482 else if (ic->mode == 'B' || ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP))
468dfca3
MP		 483 ic->sb->version = SB_VERSION_3;
484 else if (ic->meta_dev || ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
1f9fc0b8
MP		 485 ic->sb->version = SB_VERSION_2;
486 else
487 ic->sb->version = SB_VERSION_1;
488}
489
7eada909
MP		 490static int sync_rw_sb(struct dm_integrity_c *ic, int op, int op_flags)
491{
492 struct dm_io_request io_req;
493 struct dm_io_region io_loc;
494
495 io_req.bi_op = op;
496 io_req.bi_op_flags = op_flags;
497 io_req.mem.type = DM_IO_KMEM;
498 io_req.mem.ptr.addr = ic->sb;
499 io_req.notify.fn = NULL;
500 io_req.client = ic->io;
356d9d52 501 io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
7eada909
MP		 502 io_loc.sector = ic->start;
503 io_loc.count = SB_SECTORS;
504
5f1c56b3
MB		 505 if (op == REQ_OP_WRITE)
506 sb_set_version(ic);
507
7eada909
MP		 508 return dm_io(&io_req, 1, &io_loc, NULL);
509}
510
468dfca3
MP		 511#define BITMAP_OP_TEST_ALL_SET 0
512#define BITMAP_OP_TEST_ALL_CLEAR 1
513#define BITMAP_OP_SET 2
514#define BITMAP_OP_CLEAR 3
515
05d6909e
MS		 516static bool block_bitmap_op(struct dm_integrity_c *ic, struct page_list *bitmap,
517 sector_t sector, sector_t n_sectors, int mode)
468dfca3
MP		 518{
519 unsigned long bit, end_bit, this_end_bit, page, end_page;
520 unsigned long *data;
521
522 if (unlikely(((sector | n_sectors) & ((1 << ic->sb->log2_sectors_per_block) - 1)) != 0)) {
05d6909e 523 DMCRIT("invalid bitmap access (%llx,%llx,%d,%d,%d)",
7649194a
MP		 524 sector,
525 n_sectors,
468dfca3
MP		 526 ic->sb->log2_sectors_per_block,
527 ic->log2_blocks_per_bitmap_bit,
528 mode);
529 BUG();
530 }
531
532 if (unlikely(!n_sectors))
533 return true;
534
535 bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
05d6909e
MS		 536 end_bit = (sector + n_sectors - 1) >>
537 (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
468dfca3
MP		 538
539 page = bit / (PAGE_SIZE * 8);
540 bit %= PAGE_SIZE * 8;
541
542 end_page = end_bit / (PAGE_SIZE * 8);
543 end_bit %= PAGE_SIZE * 8;
544
545repeat:
546 if (page < end_page) {
547 this_end_bit = PAGE_SIZE * 8 - 1;
548 } else {
549 this_end_bit = end_bit;
550 }
551
552 data = lowmem_page_address(bitmap[page].page);
553
554 if (mode == BITMAP_OP_TEST_ALL_SET) {
555 while (bit <= this_end_bit) {
556 if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
557 do {
558 if (data[bit / BITS_PER_LONG] != -1)
559 return false;
560 bit += BITS_PER_LONG;
561 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
562 continue;
563 }
564 if (!test_bit(bit, data))
565 return false;
566 bit++;
567 }
568 } else if (mode == BITMAP_OP_TEST_ALL_CLEAR) {
569 while (bit <= this_end_bit) {
570 if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
571 do {
572 if (data[bit / BITS_PER_LONG] != 0)
573 return false;
574 bit += BITS_PER_LONG;
575 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
576 continue;
577 }
578 if (test_bit(bit, data))
579 return false;
580 bit++;
581 }
582 } else if (mode == BITMAP_OP_SET) {
583 while (bit <= this_end_bit) {
584 if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
585 do {
586 data[bit / BITS_PER_LONG] = -1;
587 bit += BITS_PER_LONG;
588 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
589 continue;
590 }
591 __set_bit(bit, data);
592 bit++;
593 }
594 } else if (mode == BITMAP_OP_CLEAR) {
595 if (!bit && this_end_bit == PAGE_SIZE * 8 - 1)
596 clear_page(data);
597 else while (bit <= this_end_bit) {
598 if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
599 do {
600 data[bit / BITS_PER_LONG] = 0;
601 bit += BITS_PER_LONG;
602 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
603 continue;
604 }
605 __clear_bit(bit, data);
606 bit++;
607 }
608 } else {
609 BUG();
610 }
611
612 if (unlikely(page < end_page)) {
613 bit = 0;
614 page++;
615 goto repeat;
616 }
617
618 return true;
619}
620
621static void block_bitmap_copy(struct dm_integrity_c *ic, struct page_list *dst, struct page_list *src)
622{
623 unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
624 unsigned i;
625
626 for (i = 0; i < n_bitmap_pages; i++) {
627 unsigned long *dst_data = lowmem_page_address(dst[i].page);
628 unsigned long *src_data = lowmem_page_address(src[i].page);
629 copy_page(dst_data, src_data);
630 }
631}
632
633static struct bitmap_block_status *sector_to_bitmap_block(struct dm_integrity_c *ic, sector_t sector)
634{
635 unsigned bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
636 unsigned bitmap_block = bit / (BITMAP_BLOCK_SIZE * 8);
637
638 BUG_ON(bitmap_block >= ic->n_bitmap_blocks);
639 return &ic->bbs[bitmap_block];
640}
641
7eada909
MP		 642static void access_journal_check(struct dm_integrity_c *ic, unsigned section, unsigned offset,
643 bool e, const char *function)
644{
645#if defined(CONFIG_DM_DEBUG) || defined(INTERNAL_VERIFY)
646 unsigned limit = e ? ic->journal_section_entries : ic->journal_section_sectors;
647
648 if (unlikely(section >= ic->journal_sections) ||
649 unlikely(offset >= limit)) {
05d6909e
MS		 650 DMCRIT("%s: invalid access at (%u,%u), limit (%u,%u)",
651 function, section, offset, ic->journal_sections, limit);
7eada909
MP		 652 BUG();
653 }
654#endif
655}
656
657static void page_list_location(struct dm_integrity_c *ic, unsigned section, unsigned offset,
658 unsigned *pl_index, unsigned *pl_offset)
659{
660 unsigned sector;
661
56b67a4f 662 access_journal_check(ic, section, offset, false, "page_list_location");
7eada909
MP		 663
664 sector = section * ic->journal_section_sectors + offset;
665
666 *pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
667 *pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
668}
669
670static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl,
671 unsigned section, unsigned offset, unsigned *n_sectors)
672{
673 unsigned pl_index, pl_offset;
674 char *va;
675
676 page_list_location(ic, section, offset, &pl_index, &pl_offset);
677
678 if (n_sectors)
679 *n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT;
680
681 va = lowmem_page_address(pl[pl_index].page);
682
683 return (struct journal_sector *)(va + pl_offset);
684}
685
686static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset)
687{
688 return access_page_list(ic, ic->journal, section, offset, NULL);
689}
690
691static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned section, unsigned n)
692{
693 unsigned rel_sector, offset;
694 struct journal_sector *js;
695
696 access_journal_check(ic, section, n, true, "access_journal_entry");
697
698 rel_sector = n % JOURNAL_BLOCK_SECTORS;
699 offset = n / JOURNAL_BLOCK_SECTORS;
700
701 js = access_journal(ic, section, rel_sector);
702 return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size);
703}
704
705static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned section, unsigned n)
706{
9d609f85 707 n <<= ic->sb->log2_sectors_per_block;
7eada909 708
9d609f85
MP		 709 n += JOURNAL_BLOCK_SECTORS;
710
711 access_journal_check(ic, section, n, false, "access_journal_data");
712
713 return access_journal(ic, section, n);
7eada909
MP		 714}
715
716static void section_mac(struct dm_integrity_c *ic, unsigned section, __u8 result[JOURNAL_MAC_SIZE])
717{
718 SHASH_DESC_ON_STACK(desc, ic->journal_mac);
719 int r;
720 unsigned j, size;
721
722 desc->tfm = ic->journal_mac;
7eada909
MP		 723
724 r = crypto_shash_init(desc);
725 if (unlikely(r)) {
726 dm_integrity_io_error(ic, "crypto_shash_init", r);
727 goto err;
728 }
729
730 for (j = 0; j < ic->journal_section_entries; j++) {
731 struct journal_entry *je = access_journal_entry(ic, section, j);
732 r = crypto_shash_update(desc, (__u8 *)&je->u.sector, sizeof je->u.sector);
733 if (unlikely(r)) {
734 dm_integrity_io_error(ic, "crypto_shash_update", r);
735 goto err;
736 }
737 }
738
739 size = crypto_shash_digestsize(ic->journal_mac);
740
741 if (likely(size <= JOURNAL_MAC_SIZE)) {
742 r = crypto_shash_final(desc, result);
743 if (unlikely(r)) {
744 dm_integrity_io_error(ic, "crypto_shash_final", r);
745 goto err;
746 }
747 memset(result + size, 0, JOURNAL_MAC_SIZE - size);
748 } else {
6d39a124
KC		 749 __u8 digest[HASH_MAX_DIGESTSIZE];
750
751 if (WARN_ON(size > sizeof(digest))) {
752 dm_integrity_io_error(ic, "digest_size", -EINVAL);
753 goto err;
754 }
7eada909
MP		 755 r = crypto_shash_final(desc, digest);
756 if (unlikely(r)) {
757 dm_integrity_io_error(ic, "crypto_shash_final", r);
758 goto err;
759 }
760 memcpy(result, digest, JOURNAL_MAC_SIZE);
761 }
762
763 return;
764err:
765 memset(result, 0, JOURNAL_MAC_SIZE);
766}
767
768static void rw_section_mac(struct dm_integrity_c *ic, unsigned section, bool wr)
769{
770 __u8 result[JOURNAL_MAC_SIZE];
771 unsigned j;
772
773 if (!ic->journal_mac)
774 return;
775
776 section_mac(ic, section, result);
777
778 for (j = 0; j < JOURNAL_BLOCK_SECTORS; j++) {
779 struct journal_sector *js = access_journal(ic, section, j);
780
781 if (likely(wr))
782 memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR);
783 else {
784 if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR))
785 dm_integrity_io_error(ic, "journal mac", -EILSEQ);
786 }
787 }
788}
789
790static void complete_journal_op(void *context)
791{
792 struct journal_completion *comp = context;
793 BUG_ON(!atomic_read(&comp->in_flight));
794 if (likely(atomic_dec_and_test(&comp->in_flight)))
795 complete(&comp->comp);
796}
797
798static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
799 unsigned n_sections, struct journal_completion *comp)
800{
801 struct async_submit_ctl submit;
802 size_t n_bytes = (size_t)(n_sections * ic->journal_section_sectors) << SECTOR_SHIFT;
803 unsigned pl_index, pl_offset, section_index;
804 struct page_list *source_pl, *target_pl;
805
806 if (likely(encrypt)) {
807 source_pl = ic->journal;
808 target_pl = ic->journal_io;
809 } else {
810 source_pl = ic->journal_io;
811 target_pl = ic->journal;
812 }
813
814 page_list_location(ic, section, 0, &pl_index, &pl_offset);
815
816 atomic_add(roundup(pl_offset + n_bytes, PAGE_SIZE) >> PAGE_SHIFT, &comp->in_flight);
817
818 init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, complete_journal_op, comp, NULL);
819
820 section_index = pl_index;
821
822 do {
823 size_t this_step;
824 struct page *src_pages[2];
825 struct page *dst_page;
826
827 while (unlikely(pl_index == section_index)) {
828 unsigned dummy;
829 if (likely(encrypt))
830 rw_section_mac(ic, section, true);
831 section++;
832 n_sections--;
833 if (!n_sections)
834 break;
835 page_list_location(ic, section, 0, &section_index, &dummy);
836 }
837
838 this_step = min(n_bytes, (size_t)PAGE_SIZE - pl_offset);
839 dst_page = target_pl[pl_index].page;
840 src_pages[0] = source_pl[pl_index].page;
841 src_pages[1] = ic->journal_xor[pl_index].page;
842
843 async_xor(dst_page, src_pages, pl_offset, 2, this_step, &submit);
844
845 pl_index++;
846 pl_offset = 0;
847 n_bytes -= this_step;
848 } while (n_bytes);
849
850 BUG_ON(n_sections);
851
852 async_tx_issue_pending_all();
853}
854
855static void complete_journal_encrypt(struct crypto_async_request *req, int err)
856{
857 struct journal_completion *comp = req->data;
858 if (unlikely(err)) {
859 if (likely(err == -EINPROGRESS)) {
860 complete(&comp->ic->crypto_backoff);
861 return;
862 }
863 dm_integrity_io_error(comp->ic, "asynchronous encrypt", err);
864 }
865 complete_journal_op(comp);
866}
867
868static bool do_crypt(bool encrypt, struct skcipher_request *req, struct journal_completion *comp)
869{
870 int r;
432061b3 871 skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
7eada909
MP		 872 complete_journal_encrypt, comp);
873 if (likely(encrypt))
874 r = crypto_skcipher_encrypt(req);
875 else
876 r = crypto_skcipher_decrypt(req);
877 if (likely(!r))
878 return false;
879 if (likely(r == -EINPROGRESS))
880 return true;
881 if (likely(r == -EBUSY)) {
882 wait_for_completion(&comp->ic->crypto_backoff);
883 reinit_completion(&comp->ic->crypto_backoff);
884 return true;
885 }
886 dm_integrity_io_error(comp->ic, "encrypt", r);
887 return false;
888}
889
890static void crypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
891 unsigned n_sections, struct journal_completion *comp)
892{
893 struct scatterlist **source_sg;
894 struct scatterlist **target_sg;
895
896 atomic_add(2, &comp->in_flight);
897
898 if (likely(encrypt)) {
899 source_sg = ic->journal_scatterlist;
900 target_sg = ic->journal_io_scatterlist;
901 } else {
902 source_sg = ic->journal_io_scatterlist;
903 target_sg = ic->journal_scatterlist;
904 }
905
906 do {
907 struct skcipher_request *req;
908 unsigned ivsize;
909 char *iv;
910
911 if (likely(encrypt))
912 rw_section_mac(ic, section, true);
913
914 req = ic->sk_requests[section];
915 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
916 iv = req->iv;
917
918 memcpy(iv, iv + ivsize, ivsize);
919
920 req->src = source_sg[section];
921 req->dst = target_sg[section];
922
923 if (unlikely(do_crypt(encrypt, req, comp)))
924 atomic_inc(&comp->in_flight);
925
926 section++;
927 n_sections--;
928 } while (n_sections);
929
930 atomic_dec(&comp->in_flight);
931 complete_journal_op(comp);
932}
933
934static void encrypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
935 unsigned n_sections, struct journal_completion *comp)
936{
937 if (ic->journal_xor)
938 return xor_journal(ic, encrypt, section, n_sections, comp);
939 else
940 return crypt_journal(ic, encrypt, section, n_sections, comp);
941}
942
943static void complete_journal_io(unsigned long error, void *context)
944{
945 struct journal_completion *comp = context;
946 if (unlikely(error != 0))
947 dm_integrity_io_error(comp->ic, "writing journal", -EIO);
948 complete_journal_op(comp);
949}
950
981e8a98
MP		 951static void rw_journal_sectors(struct dm_integrity_c *ic, int op, int op_flags,
952 unsigned sector, unsigned n_sectors, struct journal_completion *comp)
7eada909
MP		 953{
954 struct dm_io_request io_req;
955 struct dm_io_region io_loc;
981e8a98 956 unsigned pl_index, pl_offset;
7eada909
MP		 957 int r;
958
959 if (unlikely(dm_integrity_failed(ic))) {
960 if (comp)
961 complete_journal_io(-1UL, comp);
962 return;
963 }
964
7eada909
MP		 965 pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
966 pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
967
968 io_req.bi_op = op;
969 io_req.bi_op_flags = op_flags;
970 io_req.mem.type = DM_IO_PAGE_LIST;
971 if (ic->journal_io)
972 io_req.mem.ptr.pl = &ic->journal_io[pl_index];
973 else
974 io_req.mem.ptr.pl = &ic->journal[pl_index];
975 io_req.mem.offset = pl_offset;
976 if (likely(comp != NULL)) {
977 io_req.notify.fn = complete_journal_io;
978 io_req.notify.context = comp;
979 } else {
980 io_req.notify.fn = NULL;
981 }
982 io_req.client = ic->io;
356d9d52 983 io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
7eada909
MP		 984 io_loc.sector = ic->start + SB_SECTORS + sector;
985 io_loc.count = n_sectors;
986
987 r = dm_io(&io_req, 1, &io_loc, NULL);
988 if (unlikely(r)) {
989 dm_integrity_io_error(ic, op == REQ_OP_READ ? "reading journal" : "writing journal", r);
990 if (comp) {
991 WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
992 complete_journal_io(-1UL, comp);
993 }
994 }
995}
996
981e8a98
MP		 997static void rw_journal(struct dm_integrity_c *ic, int op, int op_flags, unsigned section,
998 unsigned n_sections, struct journal_completion *comp)
999{
1000 unsigned sector, n_sectors;
1001
1002 sector = section * ic->journal_section_sectors;
1003 n_sectors = n_sections * ic->journal_section_sectors;
1004
1005 rw_journal_sectors(ic, op, op_flags, sector, n_sectors, comp);
1006}
1007
7eada909
MP		 1008static void write_journal(struct dm_integrity_c *ic, unsigned commit_start, unsigned commit_sections)
1009{
1010 struct journal_completion io_comp;
1011 struct journal_completion crypt_comp_1;
1012 struct journal_completion crypt_comp_2;
1013 unsigned i;
1014
1015 io_comp.ic = ic;
b5e8ad92 1016 init_completion(&io_comp.comp);
7eada909
MP		 1017
1018 if (commit_start + commit_sections <= ic->journal_sections) {
1019 io_comp.in_flight = (atomic_t)ATOMIC_INIT(1);
1020 if (ic->journal_io) {
1021 crypt_comp_1.ic = ic;
b5e8ad92 1022 init_completion(&crypt_comp_1.comp);
7eada909
MP		 1023 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1024 encrypt_journal(ic, true, commit_start, commit_sections, &crypt_comp_1);
1025 wait_for_completion_io(&crypt_comp_1.comp);
1026 } else {
1027 for (i = 0; i < commit_sections; i++)
1028 rw_section_mac(ic, commit_start + i, true);
1029 }
ff0361b3
JK		 1030 rw_journal(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, commit_start,
1031 commit_sections, &io_comp);
7eada909
MP		 1032 } else {
1033 unsigned to_end;
1034 io_comp.in_flight = (atomic_t)ATOMIC_INIT(2);
1035 to_end = ic->journal_sections - commit_start;
1036 if (ic->journal_io) {
1037 crypt_comp_1.ic = ic;
b5e8ad92 1038 init_completion(&crypt_comp_1.comp);
7eada909
MP		 1039 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1040 encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1);
1041 if (try_wait_for_completion(&crypt_comp_1.comp)) {
1042 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
b5e8ad92 1043 reinit_completion(&crypt_comp_1.comp);
7eada909
MP		 1044 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1045 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1);
1046 wait_for_completion_io(&crypt_comp_1.comp);
1047 } else {
1048 crypt_comp_2.ic = ic;
b5e8ad92 1049 init_completion(&crypt_comp_2.comp);
7eada909
MP		 1050 crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0);
1051 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2);
1052 wait_for_completion_io(&crypt_comp_1.comp);
1053 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1054 wait_for_completion_io(&crypt_comp_2.comp);
1055 }
1056 } else {
1057 for (i = 0; i < to_end; i++)
1058 rw_section_mac(ic, commit_start + i, true);
1059 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1060 for (i = 0; i < commit_sections - to_end; i++)
1061 rw_section_mac(ic, i, true);
1062 }
1063 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, 0, commit_sections - to_end, &io_comp);
1064 }
1065
1066 wait_for_completion_io(&io_comp.comp);
1067}
1068
1069static void copy_from_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset,
1070 unsigned n_sectors, sector_t target, io_notify_fn fn, void *data)
1071{
1072 struct dm_io_request io_req;
1073 struct dm_io_region io_loc;
1074 int r;
1075 unsigned sector, pl_index, pl_offset;
1076
9d609f85
MP		 1077 BUG_ON((target | n_sectors | offset) & (unsigned)(ic->sectors_per_block - 1));
1078
7eada909
MP		 1079 if (unlikely(dm_integrity_failed(ic))) {
1080 fn(-1UL, data);
1081 return;
1082 }
1083
1084 sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset;
1085
1086 pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
1087 pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
1088
1089 io_req.bi_op = REQ_OP_WRITE;
1090 io_req.bi_op_flags = 0;
1091 io_req.mem.type = DM_IO_PAGE_LIST;
1092 io_req.mem.ptr.pl = &ic->journal[pl_index];
1093 io_req.mem.offset = pl_offset;
1094 io_req.notify.fn = fn;
1095 io_req.notify.context = data;
1096 io_req.client = ic->io;
1097 io_loc.bdev = ic->dev->bdev;
71e9ddbc 1098 io_loc.sector = target;
7eada909
MP		 1099 io_loc.count = n_sectors;
1100
1101 r = dm_io(&io_req, 1, &io_loc, NULL);
1102 if (unlikely(r)) {
1103 WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
1104 fn(-1UL, data);
1105 }
1106}
1107
724376a0
MP		 1108static bool ranges_overlap(struct dm_integrity_range *range1, struct dm_integrity_range *range2)
1109{
1110 return range1->logical_sector < range2->logical_sector + range2->n_sectors &&
4ed319c6 1111 range1->logical_sector + range1->n_sectors > range2->logical_sector;
724376a0
MP		 1112}
1113
1114static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range, bool check_waiting)
7eada909
MP		 1115{
1116 struct rb_node **n = &ic->in_progress.rb_node;
1117 struct rb_node *parent;
1118
9d609f85
MP		 1119 BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned)(ic->sectors_per_block - 1));
1120
724376a0
MP		 1121 if (likely(check_waiting)) {
1122 struct dm_integrity_range *range;
1123 list_for_each_entry(range, &ic->wait_list, wait_entry) {
1124 if (unlikely(ranges_overlap(range, new_range)))
1125 return false;
1126 }
1127 }
1128
7eada909
MP		 1129 parent = NULL;
1130
1131 while (*n) {
1132 struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node);
1133
1134 parent = *n;
1135 if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector) {
1136 n = &range->node.rb_left;
1137 } else if (new_range->logical_sector >= range->logical_sector + range->n_sectors) {
1138 n = &range->node.rb_right;
1139 } else {
1140 return false;
1141 }
1142 }
1143
1144 rb_link_node(&new_range->node, parent, n);
1145 rb_insert_color(&new_range->node, &ic->in_progress);
1146
1147 return true;
1148}
1149
1150static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1151{
1152 rb_erase(&range->node, &ic->in_progress);
724376a0
MP		 1153 while (unlikely(!list_empty(&ic->wait_list))) {
1154 struct dm_integrity_range *last_range =
1155 list_first_entry(&ic->wait_list, struct dm_integrity_range, wait_entry);
1156 struct task_struct *last_range_task;
724376a0
MP		 1157 last_range_task = last_range->task;
1158 list_del(&last_range->wait_entry);
1159 if (!add_new_range(ic, last_range, false)) {
1160 last_range->task = last_range_task;
1161 list_add(&last_range->wait_entry, &ic->wait_list);
1162 break;
1163 }
1164 last_range->waiting = false;
1165 wake_up_process(last_range_task);
1166 }
7eada909
MP		 1167}
1168
1169static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1170{
1171 unsigned long flags;
1172
1173 spin_lock_irqsave(&ic->endio_wait.lock, flags);
1174 remove_range_unlocked(ic, range);
1175 spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1176}
1177
724376a0
MP		 1178static void wait_and_add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1179{
1180 new_range->waiting = true;
1181 list_add_tail(&new_range->wait_entry, &ic->wait_list);
1182 new_range->task = current;
1183 do {
1184 __set_current_state(TASK_UNINTERRUPTIBLE);
1185 spin_unlock_irq(&ic->endio_wait.lock);
1186 io_schedule();
1187 spin_lock_irq(&ic->endio_wait.lock);
1188 } while (unlikely(new_range->waiting));
1189}
1190
8b3bbd49
MP		 1191static void add_new_range_and_wait(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1192{
1193 if (unlikely(!add_new_range(ic, new_range, true)))
1194 wait_and_add_new_range(ic, new_range);
1195}
1196
7eada909
MP		 1197static void init_journal_node(struct journal_node *node)
1198{
1199 RB_CLEAR_NODE(&node->node);
1200 node->sector = (sector_t)-1;
1201}
1202
1203static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector)
1204{
1205 struct rb_node **link;
1206 struct rb_node *parent;
1207
1208 node->sector = sector;
1209 BUG_ON(!RB_EMPTY_NODE(&node->node));
1210
1211 link = &ic->journal_tree_root.rb_node;
1212 parent = NULL;
1213
1214 while (*link) {
1215 struct journal_node *j;
1216 parent = *link;
1217 j = container_of(parent, struct journal_node, node);
1218 if (sector < j->sector)
1219 link = &j->node.rb_left;
1220 else
1221 link = &j->node.rb_right;
1222 }
1223
1224 rb_link_node(&node->node, parent, link);
1225 rb_insert_color(&node->node, &ic->journal_tree_root);
1226}
1227
1228static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node)
1229{
1230 BUG_ON(RB_EMPTY_NODE(&node->node));
1231 rb_erase(&node->node, &ic->journal_tree_root);
1232 init_journal_node(node);
1233}
1234
1235#define NOT_FOUND (-1U)
1236
1237static unsigned find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector)
1238{
1239 struct rb_node *n = ic->journal_tree_root.rb_node;
1240 unsigned found = NOT_FOUND;
1241 *next_sector = (sector_t)-1;
1242 while (n) {
1243 struct journal_node *j = container_of(n, struct journal_node, node);
1244 if (sector == j->sector) {
1245 found = j - ic->journal_tree;
1246 }
1247 if (sector < j->sector) {
1248 *next_sector = j->sector;
1249 n = j->node.rb_left;
1250 } else {
1251 n = j->node.rb_right;
1252 }
1253 }
1254
1255 return found;
1256}
1257
1258static bool test_journal_node(struct dm_integrity_c *ic, unsigned pos, sector_t sector)
1259{
1260 struct journal_node *node, *next_node;
1261 struct rb_node *next;
1262
1263 if (unlikely(pos >= ic->journal_entries))
1264 return false;
1265 node = &ic->journal_tree[pos];
1266 if (unlikely(RB_EMPTY_NODE(&node->node)))
1267 return false;
1268 if (unlikely(node->sector != sector))
1269 return false;
1270
1271 next = rb_next(&node->node);
1272 if (unlikely(!next))
1273 return true;
1274
1275 next_node = container_of(next, struct journal_node, node);
1276 return next_node->sector != sector;
1277}
1278
1279static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node)
1280{
1281 struct rb_node *next;
1282 struct journal_node *next_node;
1283 unsigned next_section;
1284
1285 BUG_ON(RB_EMPTY_NODE(&node->node));
1286
1287 next = rb_next(&node->node);
1288 if (unlikely(!next))
1289 return false;
1290
1291 next_node = container_of(next, struct journal_node, node);
1292
1293 if (next_node->sector != node->sector)
1294 return false;
1295
1296 next_section = (unsigned)(next_node - ic->journal_tree) / ic->journal_section_entries;
1297 if (next_section >= ic->committed_section &&
1298 next_section < ic->committed_section + ic->n_committed_sections)
1299 return true;
1300 if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections)
1301 return true;
1302
1303 return false;
1304}
1305
1306#define TAG_READ 0
1307#define TAG_WRITE 1
1308#define TAG_CMP 2
1309
1310static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block,
1311 unsigned *metadata_offset, unsigned total_size, int op)
1312{
84597a44
MP		 1313#define MAY_BE_FILLER 1
1314#define MAY_BE_HASH 2
1315 unsigned hash_offset = 0;
1316 unsigned may_be = MAY_BE_HASH | (ic->discard ? MAY_BE_FILLER : 0);
1317
7eada909
MP		 1318 do {
1319 unsigned char *data, *dp;
1320 struct dm_buffer *b;
1321 unsigned to_copy;
1322 int r;
1323
1324 r = dm_integrity_failed(ic);
1325 if (unlikely(r))
1326 return r;
1327
1328 data = dm_bufio_read(ic->bufio, *metadata_block, &b);
5e3d0e37 1329 if (IS_ERR(data))
7eada909
MP		 1330 return PTR_ERR(data);
1331
1332 to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size);
1333 dp = data + *metadata_offset;
1334 if (op == TAG_READ) {
1335 memcpy(tag, dp, to_copy);
1336 } else if (op == TAG_WRITE) {
1337 memcpy(dp, tag, to_copy);
1e3b21c6 1338 dm_bufio_mark_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy);
84597a44 1339 } else {
7eada909 1340 /* e.g.: op == TAG_CMP */
7eada909 1341
84597a44
MP		 1342 if (likely(is_power_of_2(ic->tag_size))) {
1343 if (unlikely(memcmp(dp, tag, to_copy)))
1344 if (unlikely(!ic->discard) ||
8267d8fb 1345 unlikely(memchr_inv(dp, DISCARD_FILLER, to_copy) != NULL)) {
84597a44
MP		 1346 goto thorough_test;
1347 }
1348 } else {
1349 unsigned i, ts;
1350thorough_test:
1351 ts = total_size;
1352
1353 for (i = 0; i < to_copy; i++, ts--) {
1354 if (unlikely(dp[i] != tag[i]))
1355 may_be &= ~MAY_BE_HASH;
1356 if (likely(dp[i] != DISCARD_FILLER))
1357 may_be &= ~MAY_BE_FILLER;
1358 hash_offset++;
1359 if (unlikely(hash_offset == ic->tag_size)) {
1360 if (unlikely(!may_be)) {
1361 dm_bufio_release(b);
1362 return ts;
1363 }
1364 hash_offset = 0;
1365 may_be = MAY_BE_HASH | (ic->discard ? MAY_BE_FILLER : 0);
1366 }
7eada909 1367 }
7eada909
MP		 1368 }
1369 }
1370 dm_bufio_release(b);
1371
1372 tag += to_copy;
1373 *metadata_offset += to_copy;
1374 if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) {
1375 (*metadata_block)++;
1376 *metadata_offset = 0;
1377 }
84597a44
MP		 1378
1379 if (unlikely(!is_power_of_2(ic->tag_size))) {
1380 hash_offset = (hash_offset + to_copy) % ic->tag_size;
1381 }
1382
7eada909
MP		 1383 total_size -= to_copy;
1384 } while (unlikely(total_size));
1385
1386 return 0;
84597a44
MP		 1387#undef MAY_BE_FILLER
1388#undef MAY_BE_HASH
7eada909
MP		 1389}
1390
9b594826
MP		 1391struct flush_request {
1392 struct dm_io_request io_req;
1393 struct dm_io_region io_reg;
1394 struct dm_integrity_c *ic;
1395 struct completion comp;
1396};
1397
1398static void flush_notify(unsigned long error, void *fr_)
1399{
1400 struct flush_request *fr = fr_;
1401 if (unlikely(error != 0))
23c4ecbc 1402 dm_integrity_io_error(fr->ic, "flushing disk cache", -EIO);
9b594826
MP		 1403 complete(&fr->comp);
1404}
1405
1406static void dm_integrity_flush_buffers(struct dm_integrity_c *ic, bool flush_data)
7eada909
MP		 1407{
1408 int r;
9b594826
MP		 1409
1410 struct flush_request fr;
1411
1412 if (!ic->meta_dev)
1413 flush_data = false;
1414 if (flush_data) {
1415 fr.io_req.bi_op = REQ_OP_WRITE,
1416 fr.io_req.bi_op_flags = REQ_PREFLUSH | REQ_SYNC,
1417 fr.io_req.mem.type = DM_IO_KMEM,
1418 fr.io_req.mem.ptr.addr = NULL,
1419 fr.io_req.notify.fn = flush_notify,
1420 fr.io_req.notify.context = &fr;
1421 fr.io_req.client = dm_bufio_get_dm_io_client(ic->bufio),
1422 fr.io_reg.bdev = ic->dev->bdev,
1423 fr.io_reg.sector = 0,
1424 fr.io_reg.count = 0,
1425 fr.ic = ic;
1426 init_completion(&fr.comp);
1427 r = dm_io(&fr.io_req, 1, &fr.io_reg, NULL);
1428 BUG_ON(r);
1429 }
1430
7eada909
MP		 1431 r = dm_bufio_write_dirty_buffers(ic->bufio);
1432 if (unlikely(r))
1433 dm_integrity_io_error(ic, "writing tags", r);
9b594826
MP		 1434
1435 if (flush_data)
1436 wait_for_completion(&fr.comp);
7eada909
MP		 1437}
1438
1439static void sleep_on_endio_wait(struct dm_integrity_c *ic)
1440{
1441 DECLARE_WAITQUEUE(wait, current);
1442 __add_wait_queue(&ic->endio_wait, &wait);
1443 __set_current_state(TASK_UNINTERRUPTIBLE);
1444 spin_unlock_irq(&ic->endio_wait.lock);
1445 io_schedule();
1446 spin_lock_irq(&ic->endio_wait.lock);
1447 __remove_wait_queue(&ic->endio_wait, &wait);
1448}
1449
8376d3c1 1450static void autocommit_fn(struct timer_list *t)
7eada909 1451{
8376d3c1 1452 struct dm_integrity_c *ic = from_timer(ic, t, autocommit_timer);
7eada909
MP		 1453
1454 if (likely(!dm_integrity_failed(ic)))
1455 queue_work(ic->commit_wq, &ic->commit_work);
1456}
1457
1458static void schedule_autocommit(struct dm_integrity_c *ic)
1459{
1460 if (!timer_pending(&ic->autocommit_timer))
1461 mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies);
1462}
1463
1464static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1465{
1466 struct bio *bio;
7def52b7
MS		 1467 unsigned long flags;
1468
1469 spin_lock_irqsave(&ic->endio_wait.lock, flags);
7eada909
MP		 1470 bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1471 bio_list_add(&ic->flush_bio_list, bio);
7def52b7
MS		 1472 spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1473
7eada909
MP		 1474 queue_work(ic->commit_wq, &ic->commit_work);
1475}
1476
1477static void do_endio(struct dm_integrity_c *ic, struct bio *bio)
1478{
1479 int r = dm_integrity_failed(ic);
4e4cbee9
CH		 1480 if (unlikely(r) && !bio->bi_status)
1481 bio->bi_status = errno_to_blk_status(r);
48271493
MP		 1482 if (unlikely(ic->synchronous_mode) && bio_op(bio) == REQ_OP_WRITE) {
1483 unsigned long flags;
1484 spin_lock_irqsave(&ic->endio_wait.lock, flags);
1485 bio_list_add(&ic->synchronous_bios, bio);
1486 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
1487 spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1488 return;
1489 }
7eada909
MP		 1490 bio_endio(bio);
1491}
1492
1493static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1494{
1495 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1496
4e4cbee9 1497 if (unlikely(dio->fua) && likely(!bio->bi_status) && likely(!dm_integrity_failed(ic)))
7eada909
MP		 1498 submit_flush_bio(ic, dio);
1499 else
1500 do_endio(ic, bio);
1501}
1502
1503static void dec_in_flight(struct dm_integrity_io *dio)
1504{
1505 if (atomic_dec_and_test(&dio->in_flight)) {
1506 struct dm_integrity_c *ic = dio->ic;
1507 struct bio *bio;
1508
1509 remove_range(ic, &dio->range);
1510
84597a44 1511 if (dio->op == REQ_OP_WRITE || unlikely(dio->op == REQ_OP_DISCARD))
7eada909
MP		 1512 schedule_autocommit(ic);
1513
1514 bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1515
4e4cbee9
CH		 1516 if (unlikely(dio->bi_status) && !bio->bi_status)
1517 bio->bi_status = dio->bi_status;
1518 if (likely(!bio->bi_status) && unlikely(bio_sectors(bio) != dio->range.n_sectors)) {
7eada909
MP		 1519 dio->range.logical_sector += dio->range.n_sectors;
1520 bio_advance(bio, dio->range.n_sectors << SECTOR_SHIFT);
1521 INIT_WORK(&dio->work, integrity_bio_wait);
53770f0e 1522 queue_work(ic->offload_wq, &dio->work);
7eada909
MP		 1523 return;
1524 }
1525 do_endio_flush(ic, dio);
1526 }
1527}
1528
1529static void integrity_end_io(struct bio *bio)
1530{
1531 struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1532
248aa264
MS		 1533 dm_bio_restore(&dio->bio_details, bio);
1534 if (bio->bi_integrity)
7eada909 1535 bio->bi_opf |= REQ_INTEGRITY;
7eada909
MP		 1536
1537 if (dio->completion)
1538 complete(dio->completion);
1539
1540 dec_in_flight(dio);
1541}
1542
1543static void integrity_sector_checksum(struct dm_integrity_c *ic, sector_t sector,
1544 const char *data, char *result)
1545{
1546 __u64 sector_le = cpu_to_le64(sector);
1547 SHASH_DESC_ON_STACK(req, ic->internal_hash);
1548 int r;
1549 unsigned digest_size;
1550
1551 req->tfm = ic->internal_hash;
7eada909
MP		 1552
1553 r = crypto_shash_init(req);
1554 if (unlikely(r < 0)) {
1555 dm_integrity_io_error(ic, "crypto_shash_init", r);
1556 goto failed;
1557 }
1558
1559 r = crypto_shash_update(req, (const __u8 *)&sector_le, sizeof sector_le);
1560 if (unlikely(r < 0)) {
1561 dm_integrity_io_error(ic, "crypto_shash_update", r);
1562 goto failed;
1563 }
1564
9d609f85 1565 r = crypto_shash_update(req, data, ic->sectors_per_block << SECTOR_SHIFT);
7eada909
MP		 1566 if (unlikely(r < 0)) {
1567 dm_integrity_io_error(ic, "crypto_shash_update", r);
1568 goto failed;
1569 }
1570
1571 r = crypto_shash_final(req, result);
1572 if (unlikely(r < 0)) {
1573 dm_integrity_io_error(ic, "crypto_shash_final", r);
1574 goto failed;
1575 }
1576
1577 digest_size = crypto_shash_digestsize(ic->internal_hash);
1578 if (unlikely(digest_size < ic->tag_size))
1579 memset(result + digest_size, 0, ic->tag_size - digest_size);
1580
1581 return;
1582
1583failed:
1584 /* this shouldn't happen anyway, the hash functions have no reason to fail */
1585 get_random_bytes(result, ic->tag_size);
1586}
1587
1588static void integrity_metadata(struct work_struct *w)
1589{
1590 struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
1591 struct dm_integrity_c *ic = dio->ic;
1592
1593 int r;
1594
1595 if (ic->internal_hash) {
1596 struct bvec_iter iter;
1597 struct bio_vec bv;
1598 unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1599 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1600 char *checksums;
56b67a4f 1601 unsigned extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0;
b93b6643 1602 char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
84597a44
MP		 1603 sector_t sector;
1604 unsigned sectors_to_process;
7eada909 1605
c2bcb2b7
MP		 1606 if (unlikely(ic->mode == 'R'))
1607 goto skip_io;
1608
84597a44
MP		 1609 if (likely(dio->op != REQ_OP_DISCARD))
1610 checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT >> ic->sb->log2_sectors_per_block) * ic->tag_size + extra_space,
1611 GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
1612 else
1613 checksums = kmalloc(PAGE_SIZE, GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
6d39a124 1614 if (!checksums) {
7eada909 1615 checksums = checksums_onstack;
6d39a124
KC		 1616 if (WARN_ON(extra_space &&
1617 digest_size > sizeof(checksums_onstack))) {
1618 r = -EINVAL;
1619 goto error;
1620 }
1621 }
7eada909 1622
84597a44
MP		 1623 if (unlikely(dio->op == REQ_OP_DISCARD)) {
1624 sector_t bi_sector = dio->bio_details.bi_iter.bi_sector;
1625 unsigned bi_size = dio->bio_details.bi_iter.bi_size;
1626 unsigned max_size = likely(checksums != checksums_onstack) ? PAGE_SIZE : HASH_MAX_DIGESTSIZE;
1627 unsigned max_blocks = max_size / ic->tag_size;
1628 memset(checksums, DISCARD_FILLER, max_size);
1629
1630 while (bi_size) {
1631 unsigned this_step_blocks = bi_size >> (SECTOR_SHIFT + ic->sb->log2_sectors_per_block);
1632 this_step_blocks = min(this_step_blocks, max_blocks);
1633 r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1634 this_step_blocks * ic->tag_size, TAG_WRITE);
1635 if (unlikely(r)) {
1636 if (likely(checksums != checksums_onstack))
1637 kfree(checksums);
1638 goto error;
1639 }
1640
1641 /*if (bi_size < this_step_blocks << (SECTOR_SHIFT + ic->sb->log2_sectors_per_block)) {
1642 printk("BUGG: bi_sector: %llx, bi_size: %u\n", bi_sector, bi_size);
1643 printk("BUGG: this_step_blocks: %u\n", this_step_blocks);
1644 BUG();
1645 }*/
1646 bi_size -= this_step_blocks << (SECTOR_SHIFT + ic->sb->log2_sectors_per_block);
1647 bi_sector += this_step_blocks << ic->sb->log2_sectors_per_block;
1648 }
1649
1650 if (likely(checksums != checksums_onstack))
1651 kfree(checksums);
1652 goto skip_io;
1653 }
1654
84597a44
MP		 1655 sector = dio->range.logical_sector;
1656 sectors_to_process = dio->range.n_sectors;
1657
248aa264 1658 __bio_for_each_segment(bv, bio, iter, dio->bio_details.bi_iter) {
7eada909
MP		 1659 unsigned pos;
1660 char *mem, *checksums_ptr;
1661
1662again:
1663 mem = (char *)kmap_atomic(bv.bv_page) + bv.bv_offset;
1664 pos = 0;
1665 checksums_ptr = checksums;
1666 do {
1667 integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr);
1668 checksums_ptr += ic->tag_size;
9d609f85
MP		 1669 sectors_to_process -= ic->sectors_per_block;
1670 pos += ic->sectors_per_block << SECTOR_SHIFT;
1671 sector += ic->sectors_per_block;
7eada909
MP		 1672 } while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
1673 kunmap_atomic(mem);
1674
1675 r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
84597a44 1676 checksums_ptr - checksums, dio->op == REQ_OP_READ ? TAG_CMP : TAG_WRITE);
7eada909
MP		 1677 if (unlikely(r)) {
1678 if (r > 0) {
eaab4bde
EE		 1679 char b[BDEVNAME_SIZE];
1680 DMERR_LIMIT("%s: Checksum failed at sector 0x%llx", bio_devname(bio, b),
7649194a 1681 (sector - ((r + ic->tag_size - 1) / ic->tag_size)));
7eada909 1682 r = -EILSEQ;
3f2e5393 1683 atomic64_inc(&ic->number_of_mismatches);
7eada909
MP		 1684 }
1685 if (likely(checksums != checksums_onstack))
1686 kfree(checksums);
1687 goto error;
1688 }
1689
1690 if (!sectors_to_process)
1691 break;
1692
1693 if (unlikely(pos < bv.bv_len)) {
1694 bv.bv_offset += pos;
1695 bv.bv_len -= pos;
1696 goto again;
1697 }
1698 }
1699
1700 if (likely(checksums != checksums_onstack))
1701 kfree(checksums);
1702 } else {
248aa264 1703 struct bio_integrity_payload *bip = dio->bio_details.bi_integrity;
7eada909
MP		 1704
1705 if (bip) {
1706 struct bio_vec biv;
1707 struct bvec_iter iter;
9d609f85
MP		 1708 unsigned data_to_process = dio->range.n_sectors;
1709 sector_to_block(ic, data_to_process);
1710 data_to_process *= ic->tag_size;
7eada909
MP		 1711
1712 bip_for_each_vec(biv, bip, iter) {
1713 unsigned char *tag;
1714 unsigned this_len;
1715
1716 BUG_ON(PageHighMem(biv.bv_page));
1717 tag = lowmem_page_address(biv.bv_page) + biv.bv_offset;
1718 this_len = min(biv.bv_len, data_to_process);
1719 r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset,
84597a44 1720 this_len, dio->op == REQ_OP_READ ? TAG_READ : TAG_WRITE);
7eada909
MP		 1721 if (unlikely(r))
1722 goto error;
1723 data_to_process -= this_len;
1724 if (!data_to_process)
1725 break;
1726 }
1727 }
1728 }
c2bcb2b7 1729skip_io:
7eada909
MP		 1730 dec_in_flight(dio);
1731 return;
1732error:
4e4cbee9 1733 dio->bi_status = errno_to_blk_status(r);
7eada909
MP		 1734 dec_in_flight(dio);
1735}
1736
1737static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
1738{
1739 struct dm_integrity_c *ic = ti->private;
1740 struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
9d609f85 1741 struct bio_integrity_payload *bip;
7eada909
MP		 1742
1743 sector_t area, offset;
1744
1745 dio->ic = ic;
4e4cbee9 1746 dio->bi_status = 0;
84597a44
MP		 1747 dio->op = bio_op(bio);
1748
1749 if (unlikely(dio->op == REQ_OP_DISCARD)) {
1750 if (ti->max_io_len) {
1751 sector_t sec = dm_target_offset(ti, bio->bi_iter.bi_sector);
1752 unsigned log2_max_io_len = __fls(ti->max_io_len);
1753 sector_t start_boundary = sec >> log2_max_io_len;
1754 sector_t end_boundary = (sec + bio_sectors(bio) - 1) >> log2_max_io_len;
1755 if (start_boundary < end_boundary) {
1756 sector_t len = ti->max_io_len - (sec & (ti->max_io_len - 1));
1757 dm_accept_partial_bio(bio, len);
1758 }
1759 }
1760 }
7eada909
MP		 1761
1762 if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
1763 submit_flush_bio(ic, dio);
1764 return DM_MAPIO_SUBMITTED;
1765 }
1766
1767 dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector);
84597a44 1768 dio->fua = dio->op == REQ_OP_WRITE && bio->bi_opf & REQ_FUA;
7eada909
MP		 1769 if (unlikely(dio->fua)) {
1770 /*
1771 * Don't pass down the FUA flag because we have to flush
1772 * disk cache anyway.
1773 */
1774 bio->bi_opf &= ~REQ_FUA;
1775 }
1776 if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) {
1777 DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx",
7649194a
MP		 1778 dio->range.logical_sector, bio_sectors(bio),
1779 ic->provided_data_sectors);
846785e6 1780 return DM_MAPIO_KILL;
7eada909 1781 }
9d609f85
MP		 1782 if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned)(ic->sectors_per_block - 1))) {
1783 DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x",
1784 ic->sectors_per_block,
7649194a 1785 dio->range.logical_sector, bio_sectors(bio));
846785e6 1786 return DM_MAPIO_KILL;
9d609f85
MP		 1787 }
1788
84597a44 1789 if (ic->sectors_per_block > 1 && likely(dio->op != REQ_OP_DISCARD)) {
9d609f85
MP		 1790 struct bvec_iter iter;
1791 struct bio_vec bv;
1792 bio_for_each_segment(bv, bio, iter) {
95b1369a 1793 if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
9d609f85
MP		 1794 DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
1795 bv.bv_offset, bv.bv_len, ic->sectors_per_block);
846785e6 1796 return DM_MAPIO_KILL;
9d609f85
MP		 1797 }
1798 }
1799 }
1800
1801 bip = bio_integrity(bio);
1802 if (!ic->internal_hash) {
1803 if (bip) {
1804 unsigned wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block;
1805 if (ic->log2_tag_size >= 0)
1806 wanted_tag_size <<= ic->log2_tag_size;
1807 else
1808 wanted_tag_size *= ic->tag_size;
1809 if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) {
05d6909e
MS		 1810 DMERR("Invalid integrity data size %u, expected %u",
1811 bip->bip_iter.bi_size, wanted_tag_size);
846785e6 1812 return DM_MAPIO_KILL;
9d609f85
MP		 1813 }
1814 }
1815 } else {
1816 if (unlikely(bip != NULL)) {
1817 DMERR("Unexpected integrity data when using internal hash");
846785e6 1818 return DM_MAPIO_KILL;
9d609f85
MP		 1819 }
1820 }
7eada909 1821
84597a44 1822 if (unlikely(ic->mode == 'R') && unlikely(dio->op != REQ_OP_READ))
846785e6 1823 return DM_MAPIO_KILL;
c2bcb2b7 1824
7eada909
MP		 1825 get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1826 dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1827 bio->bi_iter.bi_sector = get_data_sector(ic, area, offset);
1828
1829 dm_integrity_map_continue(dio, true);
1830 return DM_MAPIO_SUBMITTED;
1831}
1832
1833static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
1834 unsigned journal_section, unsigned journal_entry)
1835{
1836 struct dm_integrity_c *ic = dio->ic;
1837 sector_t logical_sector;
1838 unsigned n_sectors;
1839
1840 logical_sector = dio->range.logical_sector;
1841 n_sectors = dio->range.n_sectors;
1842 do {
1843 struct bio_vec bv = bio_iovec(bio);
1844 char *mem;
1845
1846 if (unlikely(bv.bv_len >> SECTOR_SHIFT > n_sectors))
1847 bv.bv_len = n_sectors << SECTOR_SHIFT;
1848 n_sectors -= bv.bv_len >> SECTOR_SHIFT;
1849 bio_advance_iter(bio, &bio->bi_iter, bv.bv_len);
1850retry_kmap:
1851 mem = kmap_atomic(bv.bv_page);
84597a44 1852 if (likely(dio->op == REQ_OP_WRITE))
7eada909
MP		 1853 flush_dcache_page(bv.bv_page);
1854
1855 do {
1856 struct journal_entry *je = access_journal_entry(ic, journal_section, journal_entry);
1857
84597a44 1858 if (unlikely(dio->op == REQ_OP_READ)) {
7eada909 1859 struct journal_sector *js;
9d609f85
MP		 1860 char *mem_ptr;
1861 unsigned s;
7eada909
MP		 1862
1863 if (unlikely(journal_entry_is_inprogress(je))) {
1864 flush_dcache_page(bv.bv_page);
1865 kunmap_atomic(mem);
1866
1867 __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
1868 goto retry_kmap;
1869 }
1870 smp_rmb();
1871 BUG_ON(journal_entry_get_sector(je) != logical_sector);
1872 js = access_journal_data(ic, journal_section, journal_entry);
9d609f85
MP		 1873 mem_ptr = mem + bv.bv_offset;
1874 s = 0;
1875 do {
1876 memcpy(mem_ptr, js, JOURNAL_SECTOR_DATA);
1877 *(commit_id_t *)(mem_ptr + JOURNAL_SECTOR_DATA) = je->last_bytes[s];
1878 js++;
1879 mem_ptr += 1 << SECTOR_SHIFT;
1880 } while (++s < ic->sectors_per_block);
7eada909
MP		 1881#ifdef INTERNAL_VERIFY
1882 if (ic->internal_hash) {
b93b6643 1883 char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
7eada909
MP		 1884
1885 integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack);
9d609f85 1886 if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) {
22555744 1887 DMERR_LIMIT("Checksum failed when reading from journal, at sector 0x%llx",
7649194a 1888 logical_sector);
7eada909
MP		 1889 }
1890 }
1891#endif
1892 }
1893
1894 if (!ic->internal_hash) {
1895 struct bio_integrity_payload *bip = bio_integrity(bio);
1896 unsigned tag_todo = ic->tag_size;
9d609f85 1897 char *tag_ptr = journal_entry_tag(ic, je);
7eada909
MP		 1898
1899 if (bip) do {
1900 struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
1901 unsigned tag_now = min(biv.bv_len, tag_todo);
1902 char *tag_addr;
1903 BUG_ON(PageHighMem(biv.bv_page));
1904 tag_addr = lowmem_page_address(biv.bv_page) + biv.bv_offset;
84597a44 1905 if (likely(dio->op == REQ_OP_WRITE))
7eada909
MP		 1906 memcpy(tag_ptr, tag_addr, tag_now);
1907 else
1908 memcpy(tag_addr, tag_ptr, tag_now);
1909 bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now);
1910 tag_ptr += tag_now;
1911 tag_todo -= tag_now;
1912 } while (unlikely(tag_todo)); else {
84597a44 1913 if (likely(dio->op == REQ_OP_WRITE))
7eada909
MP		 1914 memset(tag_ptr, 0, tag_todo);
1915 }
1916 }
1917
84597a44 1918 if (likely(dio->op == REQ_OP_WRITE)) {
7eada909 1919 struct journal_sector *js;
9d609f85 1920 unsigned s;
7eada909
MP		 1921
1922 js = access_journal_data(ic, journal_section, journal_entry);
9d609f85
MP		 1923 memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT);
1924
1925 s = 0;
1926 do {
1927 je->last_bytes[s] = js[s].commit_id;
1928 } while (++s < ic->sectors_per_block);
7eada909
MP		 1929
1930 if (ic->internal_hash) {
1931 unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1932 if (unlikely(digest_size > ic->tag_size)) {
6d39a124 1933 char checksums_onstack[HASH_MAX_DIGESTSIZE];
7eada909 1934 integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack);
9d609f85 1935 memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size);
7eada909 1936 } else
9d609f85 1937 integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je));
7eada909
MP		 1938 }
1939
1940 journal_entry_set_sector(je, logical_sector);
1941 }
9d609f85 1942 logical_sector += ic->sectors_per_block;
7eada909
MP		 1943
1944 journal_entry++;
1945 if (unlikely(journal_entry == ic->journal_section_entries)) {
1946 journal_entry = 0;
1947 journal_section++;
1948 wraparound_section(ic, &journal_section);
1949 }
1950
9d609f85
MP		 1951 bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT;
1952 } while (bv.bv_len -= ic->sectors_per_block << SECTOR_SHIFT);
7eada909 1953
84597a44 1954 if (unlikely(dio->op == REQ_OP_READ))
7eada909
MP		 1955 flush_dcache_page(bv.bv_page);
1956 kunmap_atomic(mem);
1957 } while (n_sectors);
1958
84597a44 1959 if (likely(dio->op == REQ_OP_WRITE)) {
7eada909
MP		 1960 smp_mb();
1961 if (unlikely(waitqueue_active(&ic->copy_to_journal_wait)))
1962 wake_up(&ic->copy_to_journal_wait);
d3e632f0 1963 if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) {
7eada909
MP		 1964 queue_work(ic->commit_wq, &ic->commit_work);
1965 } else {
1966 schedule_autocommit(ic);
1967 }
1968 } else {
1969 remove_range(ic, &dio->range);
1970 }
1971
1972 if (unlikely(bio->bi_iter.bi_size)) {
1973 sector_t area, offset;
1974
1975 dio->range.logical_sector = logical_sector;
1976 get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1977 dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1978 return true;
1979 }
1980
1981 return false;
1982}
1983
1984static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map)
1985{
1986 struct dm_integrity_c *ic = dio->ic;
1987 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1988 unsigned journal_section, journal_entry;
1989 unsigned journal_read_pos;
1990 struct completion read_comp;
31843eda 1991 bool discard_retried = false;
84597a44
MP		 1992 bool need_sync_io = ic->internal_hash && dio->op == REQ_OP_READ;
1993 if (unlikely(dio->op == REQ_OP_DISCARD) && ic->mode != 'D')
1994 need_sync_io = true;
7eada909
MP		 1995
1996 if (need_sync_io && from_map) {
1997 INIT_WORK(&dio->work, integrity_bio_wait);
53770f0e 1998 queue_work(ic->offload_wq, &dio->work);
7eada909
MP		 1999 return;
2000 }
2001
2002lock_retry:
2003 spin_lock_irq(&ic->endio_wait.lock);
2004retry:
2005 if (unlikely(dm_integrity_failed(ic))) {
2006 spin_unlock_irq(&ic->endio_wait.lock);
2007 do_endio(ic, bio);
2008 return;
2009 }
2010 dio->range.n_sectors = bio_sectors(bio);
2011 journal_read_pos = NOT_FOUND;
84597a44
MP		 2012 if (ic->mode == 'J' && likely(dio->op != REQ_OP_DISCARD)) {
2013 if (dio->op == REQ_OP_WRITE) {
7eada909 2014 unsigned next_entry, i, pos;
9dd59727 2015 unsigned ws, we, range_sectors;
7eada909 2016
9dd59727 2017 dio->range.n_sectors = min(dio->range.n_sectors,
4f43446d 2018 (sector_t)ic->free_sectors << ic->sb->log2_sectors_per_block);
518748b1
MP		 2019 if (unlikely(!dio->range.n_sectors)) {
2020 if (from_map)
2021 goto offload_to_thread;
2022 sleep_on_endio_wait(ic);
2023 goto retry;
2024 }
9dd59727
MP		 2025 range_sectors = dio->range.n_sectors >> ic->sb->log2_sectors_per_block;
2026 ic->free_sectors -= range_sectors;
7eada909
MP		 2027 journal_section = ic->free_section;
2028 journal_entry = ic->free_section_entry;
2029
9dd59727 2030 next_entry = ic->free_section_entry + range_sectors;
7eada909
MP		 2031 ic->free_section_entry = next_entry % ic->journal_section_entries;
2032 ic->free_section += next_entry / ic->journal_section_entries;
2033 ic->n_uncommitted_sections += next_entry / ic->journal_section_entries;
2034 wraparound_section(ic, &ic->free_section);
2035
2036 pos = journal_section * ic->journal_section_entries + journal_entry;
2037 ws = journal_section;
2038 we = journal_entry;
9d609f85
MP		 2039 i = 0;
2040 do {
7eada909
MP		 2041 struct journal_entry *je;
2042
2043 add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i);
2044 pos++;
2045 if (unlikely(pos >= ic->journal_entries))
2046 pos = 0;
2047
2048 je = access_journal_entry(ic, ws, we);
2049 BUG_ON(!journal_entry_is_unused(je));
2050 journal_entry_set_inprogress(je);
2051 we++;
2052 if (unlikely(we == ic->journal_section_entries)) {
2053 we = 0;
2054 ws++;
2055 wraparound_section(ic, &ws);
2056 }
9d609f85 2057 } while ((i += ic->sectors_per_block) < dio->range.n_sectors);
7eada909
MP		 2058
2059 spin_unlock_irq(&ic->endio_wait.lock);
2060 goto journal_read_write;
2061 } else {
2062 sector_t next_sector;
2063 journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2064 if (likely(journal_read_pos == NOT_FOUND)) {
2065 if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector))
2066 dio->range.n_sectors = next_sector - dio->range.logical_sector;
2067 } else {
2068 unsigned i;
9d609f85
MP		 2069 unsigned jp = journal_read_pos + 1;
2070 for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) {
2071 if (!test_journal_node(ic, jp, dio->range.logical_sector + i))
7eada909
MP		 2072 break;
2073 }
2074 dio->range.n_sectors = i;
2075 }
2076 }
2077 }
724376a0 2078 if (unlikely(!add_new_range(ic, &dio->range, true))) {
7eada909
MP		 2079 /*
2080 * We must not sleep in the request routine because it could
2081 * stall bios on current->bio_list.
2082 * So, we offload the bio to a workqueue if we have to sleep.
2083 */
7eada909 2084 if (from_map) {
518748b1 2085offload_to_thread:
7eada909
MP		 2086 spin_unlock_irq(&ic->endio_wait.lock);
2087 INIT_WORK(&dio->work, integrity_bio_wait);
2088 queue_work(ic->wait_wq, &dio->work);
2089 return;
7eada909 2090 }
5729b6e5
MP		 2091 if (journal_read_pos != NOT_FOUND)
2092 dio->range.n_sectors = ic->sectors_per_block;
724376a0 2093 wait_and_add_new_range(ic, &dio->range);
5729b6e5
MP		 2094 /*
2095 * wait_and_add_new_range drops the spinlock, so the journal
2096 * may have been changed arbitrarily. We need to recheck.
2097 * To simplify the code, we restrict I/O size to just one block.
2098 */
2099 if (journal_read_pos != NOT_FOUND) {
2100 sector_t next_sector;
2101 unsigned new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2102 if (unlikely(new_pos != journal_read_pos)) {
2103 remove_range_unlocked(ic, &dio->range);
2104 goto retry;
2105 }
2106 }
7eada909 2107 }
31843eda
MP		 2108 if (ic->mode == 'J' && likely(dio->op == REQ_OP_DISCARD) && !discard_retried) {
2109 sector_t next_sector;
2110 unsigned new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2111 if (unlikely(new_pos != NOT_FOUND) ||
2112 unlikely(next_sector < dio->range.logical_sector - dio->range.n_sectors)) {
2113 remove_range_unlocked(ic, &dio->range);
2114 spin_unlock_irq(&ic->endio_wait.lock);
2115 queue_work(ic->commit_wq, &ic->commit_work);
2116 flush_workqueue(ic->commit_wq);
2117 queue_work(ic->writer_wq, &ic->writer_work);
2118 flush_workqueue(ic->writer_wq);
2119 discard_retried = true;
2120 goto lock_retry;
2121 }
2122 }
7eada909
MP		 2123 spin_unlock_irq(&ic->endio_wait.lock);
2124
2125 if (unlikely(journal_read_pos != NOT_FOUND)) {
2126 journal_section = journal_read_pos / ic->journal_section_entries;
2127 journal_entry = journal_read_pos % ic->journal_section_entries;
2128 goto journal_read_write;
2129 }
2130
84597a44 2131 if (ic->mode == 'B' && (dio->op == REQ_OP_WRITE || unlikely(dio->op == REQ_OP_DISCARD))) {
05d6909e
MS		 2132 if (!block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2133 dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
2134 struct bitmap_block_status *bbs;
468dfca3 2135
05d6909e 2136 bbs = sector_to_bitmap_block(ic, dio->range.logical_sector);
468dfca3
MP		 2137 spin_lock(&bbs->bio_queue_lock);
2138 bio_list_add(&bbs->bio_queue, bio);
2139 spin_unlock(&bbs->bio_queue_lock);
468dfca3 2140 queue_work(ic->writer_wq, &bbs->work);
468dfca3
MP		 2141 return;
2142 }
2143 }
2144
7eada909
MP		 2145 dio->in_flight = (atomic_t)ATOMIC_INIT(2);
2146
2147 if (need_sync_io) {
b5e8ad92 2148 init_completion(&read_comp);
7eada909
MP		 2149 dio->completion = &read_comp;
2150 } else
2151 dio->completion = NULL;
2152
248aa264 2153 dm_bio_record(&dio->bio_details, bio);
74d46992 2154 bio_set_dev(bio, ic->dev->bdev);
7eada909
MP		 2155 bio->bi_integrity = NULL;
2156 bio->bi_opf &= ~REQ_INTEGRITY;
7eada909 2157 bio->bi_end_io = integrity_end_io;
7eada909 2158 bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT;
248aa264 2159
84597a44
MP		 2160 if (unlikely(dio->op == REQ_OP_DISCARD) && likely(ic->mode != 'D')) {
2161 integrity_metadata(&dio->work);
9b594826 2162 dm_integrity_flush_buffers(ic, false);
84597a44
MP		 2163
2164 dio->in_flight = (atomic_t)ATOMIC_INIT(1);
2165 dio->completion = NULL;
2166
ed00aabd 2167 submit_bio_noacct(bio);
84597a44
MP		 2168
2169 return;
2170 }
2171
ed00aabd 2172 submit_bio_noacct(bio);
7eada909
MP		 2173
2174 if (need_sync_io) {
2175 wait_for_completion_io(&read_comp);
468dfca3 2176 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
a3fcf725
MP		 2177 dio->range.logical_sector + dio->range.n_sectors > le64_to_cpu(ic->sb->recalc_sector))
2178 goto skip_check;
468dfca3 2179 if (ic->mode == 'B') {
05d6909e
MS		 2180 if (!block_bitmap_op(ic, ic->recalc_bitmap, dio->range.logical_sector,
2181 dio->range.n_sectors, BITMAP_OP_TEST_ALL_CLEAR))
468dfca3
MP		 2182 goto skip_check;
2183 }
2184
b7e326f7
HL		 2185 if (likely(!bio->bi_status))
2186 integrity_metadata(&dio->work);
2187 else
a3fcf725 2188skip_check:
b7e326f7
HL		 2189 dec_in_flight(dio);
2190
7eada909
MP		 2191 } else {
2192 INIT_WORK(&dio->work, integrity_metadata);
2193 queue_work(ic->metadata_wq, &dio->work);
2194 }
2195
2196 return;
2197
2198journal_read_write:
2199 if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry)))
2200 goto lock_retry;
2201
2202 do_endio_flush(ic, dio);
2203}
2204
2205
2206static void integrity_bio_wait(struct work_struct *w)
2207{
2208 struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
2209
2210 dm_integrity_map_continue(dio, false);
2211}
2212
2213static void pad_uncommitted(struct dm_integrity_c *ic)
2214{
2215 if (ic->free_section_entry) {
2216 ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry;
2217 ic->free_section_entry = 0;
2218 ic->free_section++;
2219 wraparound_section(ic, &ic->free_section);
2220 ic->n_uncommitted_sections++;
2221 }
468dfca3 2222 if (WARN_ON(ic->journal_sections * ic->journal_section_entries !=
05d6909e
MS		 2223 (ic->n_uncommitted_sections + ic->n_committed_sections) *
2224 ic->journal_section_entries + ic->free_sectors)) {
2225 DMCRIT("journal_sections %u, journal_section_entries %u, "
2226 "n_uncommitted_sections %u, n_committed_sections %u, "
2227 "journal_section_entries %u, free_sectors %u",
2228 ic->journal_sections, ic->journal_section_entries,
2229 ic->n_uncommitted_sections, ic->n_committed_sections,
2230 ic->journal_section_entries, ic->free_sectors);
468dfca3 2231 }
7eada909
MP		 2232}
2233
2234static void integrity_commit(struct work_struct *w)
2235{
2236 struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work);
2237 unsigned commit_start, commit_sections;
2238 unsigned i, j, n;
2239 struct bio *flushes;
2240
2241 del_timer(&ic->autocommit_timer);
2242
2243 spin_lock_irq(&ic->endio_wait.lock);
2244 flushes = bio_list_get(&ic->flush_bio_list);
2245 if (unlikely(ic->mode != 'J')) {
2246 spin_unlock_irq(&ic->endio_wait.lock);
9b594826 2247 dm_integrity_flush_buffers(ic, true);
7eada909
MP		 2248 goto release_flush_bios;
2249 }
2250
2251 pad_uncommitted(ic);
2252 commit_start = ic->uncommitted_section;
2253 commit_sections = ic->n_uncommitted_sections;
2254 spin_unlock_irq(&ic->endio_wait.lock);
2255
2256 if (!commit_sections)
2257 goto release_flush_bios;
2258
2259 i = commit_start;
2260 for (n = 0; n < commit_sections; n++) {
2261 for (j = 0; j < ic->journal_section_entries; j++) {
2262 struct journal_entry *je;
2263 je = access_journal_entry(ic, i, j);
2264 io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
2265 }
2266 for (j = 0; j < ic->journal_section_sectors; j++) {
2267 struct journal_sector *js;
2268 js = access_journal(ic, i, j);
2269 js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq);
2270 }
2271 i++;
2272 if (unlikely(i >= ic->journal_sections))
2273 ic->commit_seq = next_commit_seq(ic->commit_seq);
2274 wraparound_section(ic, &i);
2275 }
2276 smp_rmb();
2277
2278 write_journal(ic, commit_start, commit_sections);
2279
2280 spin_lock_irq(&ic->endio_wait.lock);
2281 ic->uncommitted_section += commit_sections;
2282 wraparound_section(ic, &ic->uncommitted_section);
2283 ic->n_uncommitted_sections -= commit_sections;
2284 ic->n_committed_sections += commit_sections;
2285 spin_unlock_irq(&ic->endio_wait.lock);
2286
d3e632f0 2287 if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold)
7eada909
MP		 2288 queue_work(ic->writer_wq, &ic->writer_work);
2289
2290release_flush_bios:
2291 while (flushes) {
2292 struct bio *next = flushes->bi_next;
2293 flushes->bi_next = NULL;
2294 do_endio(ic, flushes);
2295 flushes = next;
2296 }
2297}
2298
2299static void complete_copy_from_journal(unsigned long error, void *context)
2300{
2301 struct journal_io *io = context;
2302 struct journal_completion *comp = io->comp;
2303 struct dm_integrity_c *ic = comp->ic;
2304 remove_range(ic, &io->range);
6f1c819c 2305 mempool_free(io, &ic->journal_io_mempool);
7eada909
MP		 2306 if (unlikely(error != 0))
2307 dm_integrity_io_error(ic, "copying from journal", -EIO);
2308 complete_journal_op(comp);
2309}
2310
9d609f85
MP		 2311static void restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js,
2312 struct journal_entry *je)
2313{
2314 unsigned s = 0;
2315 do {
2316 js->commit_id = je->last_bytes[s];
2317 js++;
2318 } while (++s < ic->sectors_per_block);
2319}
2320
7eada909
MP		 2321static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start,
2322 unsigned write_sections, bool from_replay)
2323{
2324 unsigned i, j, n;
2325 struct journal_completion comp;
a7c3e62b
MP		 2326 struct blk_plug plug;
2327
2328 blk_start_plug(&plug);
7eada909
MP		 2329
2330 comp.ic = ic;
2331 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
b5e8ad92 2332 init_completion(&comp.comp);
7eada909
MP		 2333
2334 i = write_start;
2335 for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) {
2336#ifndef INTERNAL_VERIFY
2337 if (unlikely(from_replay))
2338#endif
2339 rw_section_mac(ic, i, false);
2340 for (j = 0; j < ic->journal_section_entries; j++) {
2341 struct journal_entry *je = access_journal_entry(ic, i, j);
2342 sector_t sec, area, offset;
2343 unsigned k, l, next_loop;
2344 sector_t metadata_block;
2345 unsigned metadata_offset;
2346 struct journal_io *io;
2347
2348 if (journal_entry_is_unused(je))
2349 continue;
2350 BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay);
2351 sec = journal_entry_get_sector(je);
9d609f85
MP		 2352 if (unlikely(from_replay)) {
2353 if (unlikely(sec & (unsigned)(ic->sectors_per_block - 1))) {
2354 dm_integrity_io_error(ic, "invalid sector in journal", -EIO);
2355 sec &= ~(sector_t)(ic->sectors_per_block - 1);
2356 }
2357 }
f6f72f32
MP		 2358 if (unlikely(sec >= ic->provided_data_sectors))
2359 continue;
7eada909 2360 get_area_and_offset(ic, sec, &area, &offset);
9d609f85 2361 restore_last_bytes(ic, access_journal_data(ic, i, j), je);
7eada909
MP		 2362 for (k = j + 1; k < ic->journal_section_entries; k++) {
2363 struct journal_entry *je2 = access_journal_entry(ic, i, k);
2364 sector_t sec2, area2, offset2;
2365 if (journal_entry_is_unused(je2))
2366 break;
2367 BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay);
2368 sec2 = journal_entry_get_sector(je2);
f6f72f32
MP		 2369 if (unlikely(sec2 >= ic->provided_data_sectors))
2370 break;
7eada909 2371 get_area_and_offset(ic, sec2, &area2, &offset2);
9d609f85 2372 if (area2 != area || offset2 != offset + ((k - j) << ic->sb->log2_sectors_per_block))
7eada909 2373 break;
9d609f85 2374 restore_last_bytes(ic, access_journal_data(ic, i, k), je2);
7eada909
MP		 2375 }
2376 next_loop = k - 1;
2377
6f1c819c 2378 io = mempool_alloc(&ic->journal_io_mempool, GFP_NOIO);
7eada909
MP		 2379 io->comp = &comp;
2380 io->range.logical_sector = sec;
9d609f85 2381 io->range.n_sectors = (k - j) << ic->sb->log2_sectors_per_block;
7eada909
MP		 2382
2383 spin_lock_irq(&ic->endio_wait.lock);
8b3bbd49 2384 add_new_range_and_wait(ic, &io->range);
7eada909
MP		 2385
2386 if (likely(!from_replay)) {
2387 struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries];
2388
2389 /* don't write if there is newer committed sector */
2390 while (j < k && find_newer_committed_node(ic, &section_node[j])) {
2391 struct journal_entry *je2 = access_journal_entry(ic, i, j);
2392
2393 journal_entry_set_unused(je2);
2394 remove_journal_node(ic, &section_node[j]);
2395 j++;
9d609f85
MP		 2396 sec += ic->sectors_per_block;
2397 offset += ic->sectors_per_block;
7eada909
MP		 2398 }
2399 while (j < k && find_newer_committed_node(ic, &section_node[k - 1])) {
2400 struct journal_entry *je2 = access_journal_entry(ic, i, k - 1);
2401
2402 journal_entry_set_unused(je2);
2403 remove_journal_node(ic, &section_node[k - 1]);
2404 k--;
2405 }
2406 if (j == k) {
2407 remove_range_unlocked(ic, &io->range);
2408 spin_unlock_irq(&ic->endio_wait.lock);
6f1c819c 2409 mempool_free(io, &ic->journal_io_mempool);
7eada909
MP		 2410 goto skip_io;
2411 }
2412 for (l = j; l < k; l++) {
2413 remove_journal_node(ic, &section_node[l]);
2414 }
2415 }
2416 spin_unlock_irq(&ic->endio_wait.lock);
2417
2418 metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2419 for (l = j; l < k; l++) {
2420 int r;
2421 struct journal_entry *je2 = access_journal_entry(ic, i, l);
2422
2423 if (
2424#ifndef INTERNAL_VERIFY
2425 unlikely(from_replay) &&
2426#endif
2427 ic->internal_hash) {
6d39a124 2428 char test_tag[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
7eada909 2429
9d609f85 2430 integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block),
7eada909 2431 (char *)access_journal_data(ic, i, l), test_tag);
9d609f85 2432 if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size)))
7eada909
MP		 2433 dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ);
2434 }
2435
2436 journal_entry_set_unused(je2);
9d609f85 2437 r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset,
7eada909
MP		 2438 ic->tag_size, TAG_WRITE);
2439 if (unlikely(r)) {
2440 dm_integrity_io_error(ic, "reading tags", r);
2441 }
2442 }
2443
2444 atomic_inc(&comp.in_flight);
9d609f85
MP		 2445 copy_from_journal(ic, i, j << ic->sb->log2_sectors_per_block,
2446 (k - j) << ic->sb->log2_sectors_per_block,
2447 get_data_sector(ic, area, offset),
7eada909
MP		 2448 complete_copy_from_journal, io);
2449skip_io:
2450 j = next_loop;
2451 }
2452 }
2453
2454 dm_bufio_write_dirty_buffers_async(ic->bufio);
2455
a7c3e62b
MP		 2456 blk_finish_plug(&plug);
2457
7eada909
MP		 2458 complete_journal_op(&comp);
2459 wait_for_completion_io(&comp.comp);
2460
9b594826 2461 dm_integrity_flush_buffers(ic, true);
7eada909
MP		 2462}
2463
2464static void integrity_writer(struct work_struct *w)
2465{
2466 struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work);
2467 unsigned write_start, write_sections;
2468
2469 unsigned prev_free_sectors;
2470
2471 /* the following test is not needed, but it tests the replay code */
5df96f2b 2472 if (unlikely(dm_post_suspending(ic->ti)) && !ic->meta_dev)
7eada909
MP		 2473 return;
2474
2475 spin_lock_irq(&ic->endio_wait.lock);
2476 write_start = ic->committed_section;
2477 write_sections = ic->n_committed_sections;
2478 spin_unlock_irq(&ic->endio_wait.lock);
2479
2480 if (!write_sections)
2481 return;
2482
2483 do_journal_write(ic, write_start, write_sections, false);
2484
2485 spin_lock_irq(&ic->endio_wait.lock);
2486
2487 ic->committed_section += write_sections;
2488 wraparound_section(ic, &ic->committed_section);
2489 ic->n_committed_sections -= write_sections;
2490
2491 prev_free_sectors = ic->free_sectors;
2492 ic->free_sectors += write_sections * ic->journal_section_entries;
2493 if (unlikely(!prev_free_sectors))
2494 wake_up_locked(&ic->endio_wait);
2495
2496 spin_unlock_irq(&ic->endio_wait.lock);
2497}
2498
a3fcf725
MP		 2499static void recalc_write_super(struct dm_integrity_c *ic)
2500{
2501 int r;
2502
9b594826 2503 dm_integrity_flush_buffers(ic, false);
a3fcf725
MP		 2504 if (dm_integrity_failed(ic))
2505 return;
2506
a3fcf725
MP		 2507 r = sync_rw_sb(ic, REQ_OP_WRITE, 0);
2508 if (unlikely(r))
2509 dm_integrity_io_error(ic, "writing superblock", r);
2510}
2511
2512static void integrity_recalc(struct work_struct *w)
2513{
2514 struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, recalc_work);
2515 struct dm_integrity_range range;
2516 struct dm_io_request io_req;
2517 struct dm_io_region io_loc;
2518 sector_t area, offset;
2519 sector_t metadata_block;
2520 unsigned metadata_offset;
468dfca3 2521 sector_t logical_sector, n_sectors;
a3fcf725
MP		 2522 __u8 *t;
2523 unsigned i;
2524 int r;
2525 unsigned super_counter = 0;
2526
468dfca3
MP		 2527 DEBUG_print("start recalculation... (position %llx)\n", le64_to_cpu(ic->sb->recalc_sector));
2528
a3fcf725
MP		 2529 spin_lock_irq(&ic->endio_wait.lock);
2530
2531next_chunk:
2532
5df96f2b 2533 if (unlikely(dm_post_suspending(ic->ti)))
a3fcf725
MP		 2534 goto unlock_ret;
2535
2536 range.logical_sector = le64_to_cpu(ic->sb->recalc_sector);
468dfca3
MP		 2537 if (unlikely(range.logical_sector >= ic->provided_data_sectors)) {
2538 if (ic->mode == 'B') {
e27fec66 2539 block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
468dfca3
MP		 2540 DEBUG_print("queue_delayed_work: bitmap_flush_work\n");
2541 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
2542 }
a3fcf725 2543 goto unlock_ret;
468dfca3 2544 }
a3fcf725
MP		 2545
2546 get_area_and_offset(ic, range.logical_sector, &area, &offset);
2547 range.n_sectors = min((sector_t)RECALC_SECTORS, ic->provided_data_sectors - range.logical_sector);
2548 if (!ic->meta_dev)
4f43446d 2549 range.n_sectors = min(range.n_sectors, ((sector_t)1U << ic->sb->log2_interleave_sectors) - (unsigned)offset);
a3fcf725 2550
8b3bbd49 2551 add_new_range_and_wait(ic, &range);
a3fcf725 2552 spin_unlock_irq(&ic->endio_wait.lock);
468dfca3
MP		 2553 logical_sector = range.logical_sector;
2554 n_sectors = range.n_sectors;
2555
2556 if (ic->mode == 'B') {
2557 if (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector, n_sectors, BITMAP_OP_TEST_ALL_CLEAR)) {
2558 goto advance_and_next;
2559 }
05d6909e
MS		 2560 while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector,
2561 ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
468dfca3
MP		 2562 logical_sector += ic->sectors_per_block;
2563 n_sectors -= ic->sectors_per_block;
2564 cond_resched();
2565 }
05d6909e
MS		 2566 while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector + n_sectors - ic->sectors_per_block,
2567 ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
468dfca3
MP		 2568 n_sectors -= ic->sectors_per_block;
2569 cond_resched();
2570 }
2571 get_area_and_offset(ic, logical_sector, &area, &offset);
2572 }
2573
7649194a 2574 DEBUG_print("recalculating: %llx, %llx\n", logical_sector, n_sectors);
a3fcf725
MP		 2575
2576 if (unlikely(++super_counter == RECALC_WRITE_SUPER)) {
2577 recalc_write_super(ic);
468dfca3
MP		 2578 if (ic->mode == 'B') {
2579 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2580 }
a3fcf725
MP		 2581 super_counter = 0;
2582 }
2583
2584 if (unlikely(dm_integrity_failed(ic)))
2585 goto err;
2586
2587 io_req.bi_op = REQ_OP_READ;
2588 io_req.bi_op_flags = 0;
2589 io_req.mem.type = DM_IO_VMA;
2590 io_req.mem.ptr.addr = ic->recalc_buffer;
2591 io_req.notify.fn = NULL;
2592 io_req.client = ic->io;
2593 io_loc.bdev = ic->dev->bdev;
2594 io_loc.sector = get_data_sector(ic, area, offset);
468dfca3 2595 io_loc.count = n_sectors;
a3fcf725
MP		 2596
2597 r = dm_io(&io_req, 1, &io_loc, NULL);
2598 if (unlikely(r)) {
2599 dm_integrity_io_error(ic, "reading data", r);
2600 goto err;
2601 }
2602
2603 t = ic->recalc_tags;
468dfca3
MP		 2604 for (i = 0; i < n_sectors; i += ic->sectors_per_block) {
2605 integrity_sector_checksum(ic, logical_sector + i, ic->recalc_buffer + (i << SECTOR_SHIFT), t);
a3fcf725
MP		 2606 t += ic->tag_size;
2607 }
2608
2609 metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2610
2611 r = dm_integrity_rw_tag(ic, ic->recalc_tags, &metadata_block, &metadata_offset, t - ic->recalc_tags, TAG_WRITE);
2612 if (unlikely(r)) {
2613 dm_integrity_io_error(ic, "writing tags", r);
2614 goto err;
2615 }
2616
e27fec66
MP		 2617 if (ic->mode == 'B') {
2618 sector_t start, end;
2619 start = (range.logical_sector >>
2620 (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)) <<
2621 (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2622 end = ((range.logical_sector + range.n_sectors) >>
2623 (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)) <<
2624 (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2625 block_bitmap_op(ic, ic->recalc_bitmap, start, end - start, BITMAP_OP_CLEAR);
2626 }
2627
468dfca3
MP		 2628advance_and_next:
2629 cond_resched();
2630
a3fcf725
MP		 2631 spin_lock_irq(&ic->endio_wait.lock);
2632 remove_range_unlocked(ic, &range);
2633 ic->sb->recalc_sector = cpu_to_le64(range.logical_sector + range.n_sectors);
2634 goto next_chunk;
2635
2636err:
2637 remove_range(ic, &range);
2638 return;
2639
2640unlock_ret:
2641 spin_unlock_irq(&ic->endio_wait.lock);
2642
2643 recalc_write_super(ic);
2644}
2645
468dfca3
MP		 2646static void bitmap_block_work(struct work_struct *w)
2647{
2648 struct bitmap_block_status *bbs = container_of(w, struct bitmap_block_status, work);
2649 struct dm_integrity_c *ic = bbs->ic;
2650 struct bio *bio;
2651 struct bio_list bio_queue;
2652 struct bio_list waiting;
2653
2654 bio_list_init(&waiting);
2655
2656 spin_lock(&bbs->bio_queue_lock);
2657 bio_queue = bbs->bio_queue;
2658 bio_list_init(&bbs->bio_queue);
2659 spin_unlock(&bbs->bio_queue_lock);
2660
2661 while ((bio = bio_list_pop(&bio_queue))) {
2662 struct dm_integrity_io *dio;
2663
2664 dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2665
05d6909e
MS		 2666 if (block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2667 dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
468dfca3
MP		 2668 remove_range(ic, &dio->range);
2669 INIT_WORK(&dio->work, integrity_bio_wait);
53770f0e 2670 queue_work(ic->offload_wq, &dio->work);
468dfca3 2671 } else {
05d6909e
MS		 2672 block_bitmap_op(ic, ic->journal, dio->range.logical_sector,
2673 dio->range.n_sectors, BITMAP_OP_SET);
468dfca3
MP		 2674 bio_list_add(&waiting, bio);
2675 }
2676 }
2677
2678 if (bio_list_empty(&waiting))
2679 return;
2680
05d6909e
MS		 2681 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC,
2682 bbs->idx * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT),
2683 BITMAP_BLOCK_SIZE >> SECTOR_SHIFT, NULL);
468dfca3
MP		 2684
2685 while ((bio = bio_list_pop(&waiting))) {
2686 struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2687
05d6909e
MS		 2688 block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2689 dio->range.n_sectors, BITMAP_OP_SET);
468dfca3
MP		 2690
2691 remove_range(ic, &dio->range);
2692 INIT_WORK(&dio->work, integrity_bio_wait);
53770f0e 2693 queue_work(ic->offload_wq, &dio->work);
468dfca3
MP		 2694 }
2695
2696 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2697}
2698
2699static void bitmap_flush_work(struct work_struct *work)
2700{
2701 struct dm_integrity_c *ic = container_of(work, struct dm_integrity_c, bitmap_flush_work.work);
2702 struct dm_integrity_range range;
2703 unsigned long limit;
48271493 2704 struct bio *bio;
468dfca3 2705
9b594826 2706 dm_integrity_flush_buffers(ic, false);
468dfca3
MP		 2707
2708 range.logical_sector = 0;
2709 range.n_sectors = ic->provided_data_sectors;
2710
2711 spin_lock_irq(&ic->endio_wait.lock);
2712 add_new_range_and_wait(ic, &range);
2713 spin_unlock_irq(&ic->endio_wait.lock);
2714
9b594826 2715 dm_integrity_flush_buffers(ic, true);
468dfca3
MP		 2716
2717 limit = ic->provided_data_sectors;
2718 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
2719 limit = le64_to_cpu(ic->sb->recalc_sector)
2720 >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)
2721 << (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2722 }
48271493 2723 /*DEBUG_print("zeroing journal\n");*/
468dfca3
MP		 2724 block_bitmap_op(ic, ic->journal, 0, limit, BITMAP_OP_CLEAR);
2725 block_bitmap_op(ic, ic->may_write_bitmap, 0, limit, BITMAP_OP_CLEAR);
2726
05d6909e
MS		 2727 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
2728 ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
468dfca3 2729
48271493
MP		 2730 spin_lock_irq(&ic->endio_wait.lock);
2731 remove_range_unlocked(ic, &range);
2732 while (unlikely((bio = bio_list_pop(&ic->synchronous_bios)) != NULL)) {
2733 bio_endio(bio);
2734 spin_unlock_irq(&ic->endio_wait.lock);
2735 spin_lock_irq(&ic->endio_wait.lock);
2736 }
2737 spin_unlock_irq(&ic->endio_wait.lock);
468dfca3
MP		 2738}
2739
2740
7eada909
MP		 2741static void init_journal(struct dm_integrity_c *ic, unsigned start_section,
2742 unsigned n_sections, unsigned char commit_seq)
2743{
2744 unsigned i, j, n;
2745
2746 if (!n_sections)
2747 return;
2748
2749 for (n = 0; n < n_sections; n++) {
2750 i = start_section + n;
2751 wraparound_section(ic, &i);
2752 for (j = 0; j < ic->journal_section_sectors; j++) {
2753 struct journal_sector *js = access_journal(ic, i, j);
2754 memset(&js->entries, 0, JOURNAL_SECTOR_DATA);
2755 js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq);
2756 }
2757 for (j = 0; j < ic->journal_section_entries; j++) {
2758 struct journal_entry *je = access_journal_entry(ic, i, j);
2759 journal_entry_set_unused(je);
2760 }
2761 }
2762
2763 write_journal(ic, start_section, n_sections);
2764}
2765
2766static int find_commit_seq(struct dm_integrity_c *ic, unsigned i, unsigned j, commit_id_t id)
2767{
2768 unsigned char k;
2769 for (k = 0; k < N_COMMIT_IDS; k++) {
2770 if (dm_integrity_commit_id(ic, i, j, k) == id)
2771 return k;
2772 }
2773 dm_integrity_io_error(ic, "journal commit id", -EIO);
2774 return -EIO;
2775}
2776
2777static void replay_journal(struct dm_integrity_c *ic)
2778{
2779 unsigned i, j;
2780 bool used_commit_ids[N_COMMIT_IDS];
2781 unsigned max_commit_id_sections[N_COMMIT_IDS];
2782 unsigned write_start, write_sections;
2783 unsigned continue_section;
2784 bool journal_empty;
2785 unsigned char unused, last_used, want_commit_seq;
2786
c2bcb2b7
MP		 2787 if (ic->mode == 'R')
2788 return;
2789
7eada909
MP		 2790 if (ic->journal_uptodate)
2791 return;
2792
2793 last_used = 0;
2794 write_start = 0;
2795
2796 if (!ic->just_formatted) {
2797 DEBUG_print("reading journal\n");
2798 rw_journal(ic, REQ_OP_READ, 0, 0, ic->journal_sections, NULL);
2799 if (ic->journal_io)
2800 DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal");
2801 if (ic->journal_io) {
2802 struct journal_completion crypt_comp;
2803 crypt_comp.ic = ic;
b5e8ad92 2804 init_completion(&crypt_comp.comp);
7eada909
MP		 2805 crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0);
2806 encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp);
2807 wait_for_completion(&crypt_comp.comp);
2808 }
2809 DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal");
2810 }
2811
2812 if (dm_integrity_failed(ic))
2813 goto clear_journal;
2814
2815 journal_empty = true;
2816 memset(used_commit_ids, 0, sizeof used_commit_ids);
2817 memset(max_commit_id_sections, 0, sizeof max_commit_id_sections);
2818 for (i = 0; i < ic->journal_sections; i++) {
2819 for (j = 0; j < ic->journal_section_sectors; j++) {
2820 int k;
2821 struct journal_sector *js = access_journal(ic, i, j);
2822 k = find_commit_seq(ic, i, j, js->commit_id);
2823 if (k < 0)
2824 goto clear_journal;
2825 used_commit_ids[k] = true;
2826 max_commit_id_sections[k] = i;
2827 }
2828 if (journal_empty) {
2829 for (j = 0; j < ic->journal_section_entries; j++) {
2830 struct journal_entry *je = access_journal_entry(ic, i, j);
2831 if (!journal_entry_is_unused(je)) {
2832 journal_empty = false;
2833 break;
2834 }
2835 }
2836 }
2837 }
2838
2839 if (!used_commit_ids[N_COMMIT_IDS - 1]) {
2840 unused = N_COMMIT_IDS - 1;
2841 while (unused && !used_commit_ids[unused - 1])
2842 unused--;
2843 } else {
2844 for (unused = 0; unused < N_COMMIT_IDS; unused++)
2845 if (!used_commit_ids[unused])
2846 break;
2847 if (unused == N_COMMIT_IDS) {
2848 dm_integrity_io_error(ic, "journal commit ids", -EIO);
2849 goto clear_journal;
2850 }
2851 }
2852 DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n",
2853 unused, used_commit_ids[0], used_commit_ids[1],
2854 used_commit_ids[2], used_commit_ids[3]);
2855
2856 last_used = prev_commit_seq(unused);
2857 want_commit_seq = prev_commit_seq(last_used);
2858
2859 if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)])
2860 journal_empty = true;
2861
2862 write_start = max_commit_id_sections[last_used] + 1;
2863 if (unlikely(write_start >= ic->journal_sections))
2864 want_commit_seq = next_commit_seq(want_commit_seq);
2865 wraparound_section(ic, &write_start);
2866
2867 i = write_start;
2868 for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) {
2869 for (j = 0; j < ic->journal_section_sectors; j++) {
2870 struct journal_sector *js = access_journal(ic, i, j);
2871
2872 if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) {
2873 /*
2874 * This could be caused by crash during writing.
2875 * We won't replay the inconsistent part of the
2876 * journal.
2877 */
2878 DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n",
2879 i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq);
2880 goto brk;
2881 }
2882 }
2883 i++;
2884 if (unlikely(i >= ic->journal_sections))
2885 want_commit_seq = next_commit_seq(want_commit_seq);
2886 wraparound_section(ic, &i);
2887 }
2888brk:
2889
2890 if (!journal_empty) {
2891 DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n",
2892 write_sections, write_start, want_commit_seq);
2893 do_journal_write(ic, write_start, write_sections, true);
2894 }
2895
2896 if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) {
2897 continue_section = write_start;
2898 ic->commit_seq = want_commit_seq;
2899 DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq);
2900 } else {
2901 unsigned s;
2902 unsigned char erase_seq;
2903clear_journal:
2904 DEBUG_print("clearing journal\n");
2905
2906 erase_seq = prev_commit_seq(prev_commit_seq(last_used));
2907 s = write_start;
2908 init_journal(ic, s, 1, erase_seq);
2909 s++;
2910 wraparound_section(ic, &s);
2911 if (ic->journal_sections >= 2) {
2912 init_journal(ic, s, ic->journal_sections - 2, erase_seq);
2913 s += ic->journal_sections - 2;
2914 wraparound_section(ic, &s);
2915 init_journal(ic, s, 1, erase_seq);
2916 }
2917
2918 continue_section = 0;
2919 ic->commit_seq = next_commit_seq(erase_seq);
2920 }
2921
2922 ic->committed_section = continue_section;
2923 ic->n_committed_sections = 0;
2924
2925 ic->uncommitted_section = continue_section;
2926 ic->n_uncommitted_sections = 0;
2927
2928 ic->free_section = continue_section;
2929 ic->free_section_entry = 0;
2930 ic->free_sectors = ic->journal_entries;
2931
2932 ic->journal_tree_root = RB_ROOT;
2933 for (i = 0; i < ic->journal_entries; i++)
2934 init_journal_node(&ic->journal_tree[i]);
2935}
2936
48271493 2937static void dm_integrity_enter_synchronous_mode(struct dm_integrity_c *ic)
1f5a7759 2938{
48271493 2939 DEBUG_print("dm_integrity_enter_synchronous_mode\n");
1f5a7759
MP		 2940
2941 if (ic->mode == 'B') {
48271493
MP		 2942 ic->bitmap_flush_interval = msecs_to_jiffies(10) + 1;
2943 ic->synchronous_mode = 1;
2944
1f5a7759
MP		 2945 cancel_delayed_work_sync(&ic->bitmap_flush_work);
2946 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
2947 flush_workqueue(ic->commit_wq);
2948 }
48271493
MP		 2949}
2950
2951static int dm_integrity_reboot(struct notifier_block *n, unsigned long code, void *x)
2952{
2953 struct dm_integrity_c *ic = container_of(n, struct dm_integrity_c, reboot_notifier);
2954
2955 DEBUG_print("dm_integrity_reboot\n");
2956
2957 dm_integrity_enter_synchronous_mode(ic);
1f5a7759
MP		 2958
2959 return NOTIFY_DONE;
2960}
2961
7eada909
MP		 2962static void dm_integrity_postsuspend(struct dm_target *ti)
2963{
2964 struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
468dfca3 2965 int r;
7eada909 2966
1f5a7759 2967 WARN_ON(unregister_reboot_notifier(&ic->reboot_notifier));
7eada909
MP		 2968
2969 del_timer_sync(&ic->autocommit_timer);
2970
a3fcf725
MP		 2971 if (ic->recalc_wq)
2972 drain_workqueue(ic->recalc_wq);
2973
468dfca3
MP		 2974 if (ic->mode == 'B')
2975 cancel_delayed_work_sync(&ic->bitmap_flush_work);
2976
7eada909
MP		 2977 queue_work(ic->commit_wq, &ic->commit_work);
2978 drain_workqueue(ic->commit_wq);
2979
2980 if (ic->mode == 'J') {
747829a8
MP		 2981 if (ic->meta_dev)
2982 queue_work(ic->writer_wq, &ic->writer_work);
7eada909 2983 drain_workqueue(ic->writer_wq);
9b594826 2984 dm_integrity_flush_buffers(ic, true);
7eada909
MP		 2985 }
2986
468dfca3 2987 if (ic->mode == 'B') {
9b594826 2988 dm_integrity_flush_buffers(ic, true);
468dfca3 2989#if 1
05d6909e 2990 /* set to 0 to test bitmap replay code */
468dfca3
MP		 2991 init_journal(ic, 0, ic->journal_sections, 0);
2992 ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
2993 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
2994 if (unlikely(r))
2995 dm_integrity_io_error(ic, "writing superblock", r);
2996#endif
2997 }
2998
7eada909
MP		 2999 BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
3000
3001 ic->journal_uptodate = true;
3002}
3003
3004static void dm_integrity_resume(struct dm_target *ti)
3005{
3006 struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
1ac2c15a 3007 __u64 old_provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
468dfca3 3008 int r;
1ac2c15a 3009
468dfca3
MP		 3010 DEBUG_print("resume\n");
3011
1ac2c15a
MP		 3012 if (ic->provided_data_sectors != old_provided_data_sectors) {
3013 if (ic->provided_data_sectors > old_provided_data_sectors &&
3014 ic->mode == 'B' &&
3015 ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) {
3016 rw_journal_sectors(ic, REQ_OP_READ, 0, 0,
3017 ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3018 block_bitmap_op(ic, ic->journal, old_provided_data_sectors,
3019 ic->provided_data_sectors - old_provided_data_sectors, BITMAP_OP_SET);
3020 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
3021 ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3022 }
3023
3024 ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
3025 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
3026 if (unlikely(r))
3027 dm_integrity_io_error(ic, "writing superblock", r);
3028 }
3029
468dfca3
MP		 3030 if (ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP)) {
3031 DEBUG_print("resume dirty_bitmap\n");
05d6909e
MS		 3032 rw_journal_sectors(ic, REQ_OP_READ, 0, 0,
3033 ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
468dfca3
MP		 3034 if (ic->mode == 'B') {
3035 if (ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) {
3036 block_bitmap_copy(ic, ic->recalc_bitmap, ic->journal);
3037 block_bitmap_copy(ic, ic->may_write_bitmap, ic->journal);
05d6909e
MS		 3038 if (!block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors,
3039 BITMAP_OP_TEST_ALL_CLEAR)) {
468dfca3
MP		 3040 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3041 ic->sb->recalc_sector = cpu_to_le64(0);
3042 }
3043 } else {
05d6909e
MS		 3044 DEBUG_print("non-matching blocks_per_bitmap_bit: %u, %u\n",
3045 ic->sb->log2_blocks_per_bitmap_bit, ic->log2_blocks_per_bitmap_bit);
468dfca3
MP		 3046 ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
3047 block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3048 block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3049 block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_SET);
05d6909e
MS		 3050 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
3051 ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
468dfca3
MP		 3052 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3053 ic->sb->recalc_sector = cpu_to_le64(0);
3054 }
3055 } else {
3056 if (!(ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
3057 block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR))) {
3058 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3059 ic->sb->recalc_sector = cpu_to_le64(0);
3060 }
3061 init_journal(ic, 0, ic->journal_sections, 0);
3062 replay_journal(ic);
3063 ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3064 }
3065 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
3066 if (unlikely(r))
3067 dm_integrity_io_error(ic, "writing superblock", r);
3068 } else {
3069 replay_journal(ic);
3070 if (ic->mode == 'B') {
468dfca3
MP		 3071 ic->sb->flags |= cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3072 ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
3073 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
3074 if (unlikely(r))
3075 dm_integrity_io_error(ic, "writing superblock", r);
7eada909 3076
d5bdf661
MP		 3077 block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3078 block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3079 block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3080 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
3081 le64_to_cpu(ic->sb->recalc_sector) < ic->provided_data_sectors) {
3082 block_bitmap_op(ic, ic->journal, le64_to_cpu(ic->sb->recalc_sector),
3083 ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3084 block_bitmap_op(ic, ic->recalc_bitmap, le64_to_cpu(ic->sb->recalc_sector),
3085 ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3086 block_bitmap_op(ic, ic->may_write_bitmap, le64_to_cpu(ic->sb->recalc_sector),
3087 ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3088 }
05d6909e
MS		 3089 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
3090 ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
468dfca3
MP		 3091 }
3092 }
7eada909 3093
468dfca3
MP		 3094 DEBUG_print("testing recalc: %x\n", ic->sb->flags);
3095 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
a3fcf725 3096 __u64 recalc_pos = le64_to_cpu(ic->sb->recalc_sector);
7649194a 3097 DEBUG_print("recalc pos: %llx / %llx\n", recalc_pos, ic->provided_data_sectors);
a3fcf725
MP		 3098 if (recalc_pos < ic->provided_data_sectors) {
3099 queue_work(ic->recalc_wq, &ic->recalc_work);
3100 } else if (recalc_pos > ic->provided_data_sectors) {
3101 ic->sb->recalc_sector = cpu_to_le64(ic->provided_data_sectors);
3102 recalc_write_super(ic);
3103 }
3104 }
1f5a7759
MP		 3105
3106 ic->reboot_notifier.notifier_call = dm_integrity_reboot;
3107 ic->reboot_notifier.next = NULL;
3108 ic->reboot_notifier.priority = INT_MAX - 1; /* be notified after md and before hardware drivers */
3109 WARN_ON(register_reboot_notifier(&ic->reboot_notifier));
48271493
MP		 3110
3111#if 0
05d6909e 3112 /* set to 1 to stress test synchronous mode */
48271493
MP		 3113 dm_integrity_enter_synchronous_mode(ic);
3114#endif
7eada909
MP		 3115}
3116
3117static void dm_integrity_status(struct dm_target *ti, status_type_t type,
3118 unsigned status_flags, char *result, unsigned maxlen)
3119{
3120 struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
3121 unsigned arg_count;
3122 size_t sz = 0;
3123
3124 switch (type) {
3125 case STATUSTYPE_INFO:
f84fd2c9 3126 DMEMIT("%llu %llu",
e7fc1e57 3127 (unsigned long long)atomic64_read(&ic->number_of_mismatches),
7649194a 3128 ic->provided_data_sectors);
a3fcf725 3129 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
7649194a 3130 DMEMIT(" %llu", le64_to_cpu(ic->sb->recalc_sector));
a3fcf725
MP		 3131 else
3132 DMEMIT(" -");
7eada909
MP		 3133 break;
3134
3135 case STATUSTYPE_TABLE: {
3136 __u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100;
3137 watermark_percentage += ic->journal_entries / 2;
3138 do_div(watermark_percentage, ic->journal_entries);
893e3c39 3139 arg_count = 3;
356d9d52 3140 arg_count += !!ic->meta_dev;
9d609f85 3141 arg_count += ic->sectors_per_block != 1;
a3fcf725 3142 arg_count += !!(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING));
84597a44 3143 arg_count += ic->discard;
893e3c39
MP		 3144 arg_count += ic->mode == 'J';
3145 arg_count += ic->mode == 'J';
468dfca3
MP		 3146 arg_count += ic->mode == 'B';
3147 arg_count += ic->mode == 'B';
7eada909
MP		 3148 arg_count += !!ic->internal_hash_alg.alg_string;
3149 arg_count += !!ic->journal_crypt_alg.alg_string;
3150 arg_count += !!ic->journal_mac_alg.alg_string;
d537858a 3151 arg_count += (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0;
5c024064 3152 arg_count += ic->legacy_recalculate;
7649194a 3153 DMEMIT("%s %llu %u %c %u", ic->dev->name, ic->start,
7eada909 3154 ic->tag_size, ic->mode, arg_count);
356d9d52
MP		 3155 if (ic->meta_dev)
3156 DMEMIT(" meta_device:%s", ic->meta_dev->name);
a3fcf725
MP		 3157 if (ic->sectors_per_block != 1)
3158 DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
7fc2e47f 3159 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
a3fcf725 3160 DMEMIT(" recalculate");
84597a44
MP		 3161 if (ic->discard)
3162 DMEMIT(" allow_discards");
56b67a4f
MP		 3163 DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
3164 DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors);
3165 DMEMIT(" buffer_sectors:%u", 1U << ic->log2_buffer_sectors);
893e3c39
MP		 3166 if (ic->mode == 'J') {
3167 DMEMIT(" journal_watermark:%u", (unsigned)watermark_percentage);
3168 DMEMIT(" commit_time:%u", ic->autocommit_msec);
3169 }
468dfca3 3170 if (ic->mode == 'B') {
7649194a 3171 DMEMIT(" sectors_per_bit:%llu", (sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit);
468dfca3
MP		 3172 DMEMIT(" bitmap_flush_interval:%u", jiffies_to_msecs(ic->bitmap_flush_interval));
3173 }
d537858a
MP		 3174 if ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0)
3175 DMEMIT(" fix_padding");
5c024064
MP		 3176 if (ic->legacy_recalculate)
3177 DMEMIT(" legacy_recalculate");
7eada909
MP		 3178
3179#define EMIT_ALG(a, n) \
3180 do { \
3181 if (ic->a.alg_string) { \
3182 DMEMIT(" %s:%s", n, ic->a.alg_string); \
3183 if (ic->a.key_string) \
3184 DMEMIT(":%s", ic->a.key_string);\
3185 } \
3186 } while (0)
56b67a4f
MP		 3187 EMIT_ALG(internal_hash_alg, "internal_hash");
3188 EMIT_ALG(journal_crypt_alg, "journal_crypt");
3189 EMIT_ALG(journal_mac_alg, "journal_mac");
7eada909
MP		 3190 break;
3191 }
3192 }
3193}
3194
3195static int dm_integrity_iterate_devices(struct dm_target *ti,
3196 iterate_devices_callout_fn fn, void *data)
3197{
3198 struct dm_integrity_c *ic = ti->private;
3199
356d9d52
MP		 3200 if (!ic->meta_dev)
3201 return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data);
3202 else
3203 return fn(ti, ic->dev, 0, ti->len, data);
7eada909
MP		 3204}
3205
9d609f85
MP		 3206static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits)
3207{
3208 struct dm_integrity_c *ic = ti->private;
3209
3210 if (ic->sectors_per_block > 1) {
3211 limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
3212 limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
3213 blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT);
3214 }
3215}
3216
7eada909
MP		 3217static void calculate_journal_section_size(struct dm_integrity_c *ic)
3218{
3219 unsigned sector_space = JOURNAL_SECTOR_DATA;
3220
3221 ic->journal_sections = le32_to_cpu(ic->sb->journal_sections);
9d609f85 3222 ic->journal_entry_size = roundup(offsetof(struct journal_entry, last_bytes[ic->sectors_per_block]) + ic->tag_size,
7eada909
MP		 3223 JOURNAL_ENTRY_ROUNDUP);
3224
3225 if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC))
3226 sector_space -= JOURNAL_MAC_PER_SECTOR;
3227 ic->journal_entries_per_sector = sector_space / ic->journal_entry_size;
3228 ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS;
9d609f85 3229 ic->journal_section_sectors = (ic->journal_section_entries << ic->sb->log2_sectors_per_block) + JOURNAL_BLOCK_SECTORS;
7eada909
MP		 3230 ic->journal_entries = ic->journal_section_entries * ic->journal_sections;
3231}
3232
3233static int calculate_device_limits(struct dm_integrity_c *ic)
3234{
3235 __u64 initial_sectors;
7eada909
MP		 3236
3237 calculate_journal_section_size(ic);
3238 initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections;
356d9d52 3239 if (initial_sectors + METADATA_PADDING_SECTORS >= ic->meta_device_sectors || initial_sectors > UINT_MAX)
7eada909
MP		 3240 return -EINVAL;
3241 ic->initial_sectors = initial_sectors;
3242
356d9d52
MP		 3243 if (!ic->meta_dev) {
3244 sector_t last_sector, last_area, last_offset;
7eada909 3245
d537858a
MP		 3246 /* we have to maintain excessive padding for compatibility with existing volumes */
3247 __u64 metadata_run_padding =
3248 ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING) ?
3249 (__u64)(METADATA_PADDING_SECTORS << SECTOR_SHIFT) :
3250 (__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS);
3251
3252 ic->metadata_run = round_up((__u64)ic->tag_size << (ic->sb->log2_interleave_sectors - ic->sb->log2_sectors_per_block),
3253 metadata_run_padding) >> SECTOR_SHIFT;
356d9d52
MP		 3254 if (!(ic->metadata_run & (ic->metadata_run - 1)))
3255 ic->log2_metadata_run = __ffs(ic->metadata_run);
3256 else
3257 ic->log2_metadata_run = -1;
7eada909 3258
356d9d52
MP		 3259 get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset);
3260 last_sector = get_data_sector(ic, last_area, last_offset);
3261 if (last_sector < ic->start || last_sector >= ic->meta_device_sectors)
3262 return -EINVAL;
3263 } else {
30bba430 3264 __u64 meta_size = (ic->provided_data_sectors >> ic->sb->log2_sectors_per_block) * ic->tag_size;
356d9d52
MP		 3265 meta_size = (meta_size + ((1U << (ic->log2_buffer_sectors + SECTOR_SHIFT)) - 1))
3266 >> (ic->log2_buffer_sectors + SECTOR_SHIFT);
3267 meta_size <<= ic->log2_buffer_sectors;
3268 if (ic->initial_sectors + meta_size < ic->initial_sectors ||
3269 ic->initial_sectors + meta_size > ic->meta_device_sectors)
3270 return -EINVAL;
3271 ic->metadata_run = 1;
3272 ic->log2_metadata_run = 0;
3273 }
7eada909
MP		 3274
3275 return 0;
3276}
3277
87fb177b
MP		 3278static void get_provided_data_sectors(struct dm_integrity_c *ic)
3279{
3280 if (!ic->meta_dev) {
3281 int test_bit;
3282 ic->provided_data_sectors = 0;
3283 for (test_bit = fls64(ic->meta_device_sectors) - 1; test_bit >= 3; test_bit--) {
3284 __u64 prev_data_sectors = ic->provided_data_sectors;
3285
3286 ic->provided_data_sectors |= (sector_t)1 << test_bit;
3287 if (calculate_device_limits(ic))
3288 ic->provided_data_sectors = prev_data_sectors;
3289 }
3290 } else {
3291 ic->provided_data_sectors = ic->data_device_sectors;
3292 ic->provided_data_sectors &= ~(sector_t)(ic->sectors_per_block - 1);
3293 }
3294}
3295
7eada909
MP		 3296static int initialize_superblock(struct dm_integrity_c *ic, unsigned journal_sectors, unsigned interleave_sectors)
3297{
3298 unsigned journal_sections;
3299 int test_bit;
3300
56b67a4f 3301 memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT);
7eada909 3302 memcpy(ic->sb->magic, SB_MAGIC, 8);
7eada909 3303 ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size);
9d609f85 3304 ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block);
7eada909
MP		 3305 if (ic->journal_mac_alg.alg_string)
3306 ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC);
3307
3308 calculate_journal_section_size(ic);
3309 journal_sections = journal_sectors / ic->journal_section_sectors;
3310 if (!journal_sections)
3311 journal_sections = 1;
7eada909 3312
356d9d52 3313 if (!ic->meta_dev) {
d537858a
MP		 3314 if (ic->fix_padding)
3315 ic->sb->flags |= cpu_to_le32(SB_FLAG_FIXED_PADDING);
356d9d52
MP		 3316 ic->sb->journal_sections = cpu_to_le32(journal_sections);
3317 if (!interleave_sectors)
3318 interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
3319 ic->sb->log2_interleave_sectors = __fls(interleave_sectors);
3320 ic->sb->log2_interleave_sectors = max((__u8)MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3321 ic->sb->log2_interleave_sectors = min((__u8)MAX_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3322
87fb177b 3323 get_provided_data_sectors(ic);
356d9d52
MP		 3324 if (!ic->provided_data_sectors)
3325 return -EINVAL;
3326 } else {
3327 ic->sb->log2_interleave_sectors = 0;
87fb177b
MP		 3328
3329 get_provided_data_sectors(ic);
3330 if (!ic->provided_data_sectors)
3331 return -EINVAL;
356d9d52
MP		 3332
3333try_smaller_buffer:
3334 ic->sb->journal_sections = cpu_to_le32(0);
3335 for (test_bit = fls(journal_sections) - 1; test_bit >= 0; test_bit--) {
3336 __u32 prev_journal_sections = le32_to_cpu(ic->sb->journal_sections);
3337 __u32 test_journal_sections = prev_journal_sections | (1U << test_bit);
3338 if (test_journal_sections > journal_sections)
3339 continue;
3340 ic->sb->journal_sections = cpu_to_le32(test_journal_sections);
3341 if (calculate_device_limits(ic))
3342 ic->sb->journal_sections = cpu_to_le32(prev_journal_sections);
7eada909 3343
356d9d52
MP		 3344 }
3345 if (!le32_to_cpu(ic->sb->journal_sections)) {
3346 if (ic->log2_buffer_sectors > 3) {
3347 ic->log2_buffer_sectors--;
3348 goto try_smaller_buffer;
3349 }
3350 return -EINVAL;
3351 }
7eada909
MP		 3352 }
3353
7eada909
MP		 3354 ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
3355
1f9fc0b8
MP		 3356 sb_set_version(ic);
3357
7eada909
MP		 3358 return 0;
3359}
3360
3361static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic)
3362{
3363 struct gendisk *disk = dm_disk(dm_table_get_md(ti->table));
3364 struct blk_integrity bi;
3365
3366 memset(&bi, 0, sizeof(bi));
3367 bi.profile = &dm_integrity_profile;
9d609f85
MP		 3368 bi.tuple_size = ic->tag_size;
3369 bi.tag_size = bi.tuple_size;
84ff1bcc 3370 bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT;
7eada909
MP		 3371
3372 blk_integrity_register(disk, &bi);
3373 blk_queue_max_integrity_segments(disk->queue, UINT_MAX);
3374}
3375
d5027e03 3376static void dm_integrity_free_page_list(struct page_list *pl)
7eada909
MP		 3377{
3378 unsigned i;
3379
3380 if (!pl)
3381 return;
d5027e03
MP		 3382 for (i = 0; pl[i].page; i++)
3383 __free_page(pl[i].page);
7eada909
MP		 3384 kvfree(pl);
3385}
3386
d5027e03 3387static struct page_list *dm_integrity_alloc_page_list(unsigned n_pages)
7eada909 3388{
7eada909
MP		 3389 struct page_list *pl;
3390 unsigned i;
3391
d5027e03 3392 pl = kvmalloc_array(n_pages + 1, sizeof(struct page_list), GFP_KERNEL | __GFP_ZERO);
7eada909
MP		 3393 if (!pl)
3394 return NULL;
3395
d5027e03 3396 for (i = 0; i < n_pages; i++) {
7eada909
MP		 3397 pl[i].page = alloc_page(GFP_KERNEL);
3398 if (!pl[i].page) {
d5027e03 3399 dm_integrity_free_page_list(pl);
7eada909
MP		 3400 return NULL;
3401 }
3402 if (i)
3403 pl[i - 1].next = &pl[i];
3404 }
d5027e03
MP		 3405 pl[i].page = NULL;
3406 pl[i].next = NULL;
7eada909
MP		 3407
3408 return pl;
3409}
3410
3411static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl)
3412{
3413 unsigned i;
3414 for (i = 0; i < ic->journal_sections; i++)
3415 kvfree(sl[i]);
fc8cec11 3416 kvfree(sl);
7eada909
MP		 3417}
3418
05d6909e
MS		 3419static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic,
3420 struct page_list *pl)
7eada909
MP		 3421{
3422 struct scatterlist **sl;
3423 unsigned i;
3424
344476e1
KC		 3425 sl = kvmalloc_array(ic->journal_sections,
3426 sizeof(struct scatterlist *),
3427 GFP_KERNEL | __GFP_ZERO);
7eada909
MP		 3428 if (!sl)
3429 return NULL;
3430
3431 for (i = 0; i < ic->journal_sections; i++) {
3432 struct scatterlist *s;
3433 unsigned start_index, start_offset;
3434 unsigned end_index, end_offset;
3435 unsigned n_pages;
3436 unsigned idx;
3437
3438 page_list_location(ic, i, 0, &start_index, &start_offset);
05d6909e
MS		 3439 page_list_location(ic, i, ic->journal_section_sectors - 1,
3440 &end_index, &end_offset);
7eada909
MP		 3441
3442 n_pages = (end_index - start_index + 1);
3443
344476e1
KC		 3444 s = kvmalloc_array(n_pages, sizeof(struct scatterlist),
3445 GFP_KERNEL);
7eada909
MP		 3446 if (!s) {
3447 dm_integrity_free_journal_scatterlist(ic, sl);
3448 return NULL;
3449 }
3450
3451 sg_init_table(s, n_pages);
3452 for (idx = start_index; idx <= end_index; idx++) {
3453 char *va = lowmem_page_address(pl[idx].page);
3454 unsigned start = 0, end = PAGE_SIZE;
3455 if (idx == start_index)
3456 start = start_offset;
3457 if (idx == end_index)
3458 end = end_offset + (1 << SECTOR_SHIFT);
3459 sg_set_buf(&s[idx - start_index], va + start, end - start);
3460 }
3461
3462 sl[i] = s;
3463 }
3464
3465 return sl;
3466}
3467
3468static void free_alg(struct alg_spec *a)
3469{
453431a5
WL		 3470 kfree_sensitive(a->alg_string);
3471 kfree_sensitive(a->key);
7eada909
MP		 3472 memset(a, 0, sizeof *a);
3473}
3474
3475static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval)
3476{
3477 char *k;
3478
3479 free_alg(a);
3480
3481 a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL);
3482 if (!a->alg_string)
3483 goto nomem;
3484
3485 k = strchr(a->alg_string, ':');
3486 if (k) {
7eada909
MP		 3487 *k = 0;
3488 a->key_string = k + 1;
3489 if (strlen(a->key_string) & 1)
3490 goto inval;
3491
3492 a->key_size = strlen(a->key_string) / 2;
3493 a->key = kmalloc(a->key_size, GFP_KERNEL);
3494 if (!a->key)
3495 goto nomem;
6625d903
MP		 3496 if (hex2bin(a->key, a->key_string, a->key_size))
3497 goto inval;
7eada909
MP		 3498 }
3499
3500 return 0;
3501inval:
3502 *error = error_inval;
3503 return -EINVAL;
3504nomem:
3505 *error = "Out of memory for an argument";
3506 return -ENOMEM;
3507}
3508
3509static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error,
3510 char *error_alg, char *error_key)
3511{
3512 int r;
3513
3514 if (a->alg_string) {
a7a10bce 3515 *hash = crypto_alloc_shash(a->alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
7eada909
MP		 3516 if (IS_ERR(*hash)) {
3517 *error = error_alg;
3518 r = PTR_ERR(*hash);
3519 *hash = NULL;
3520 return r;
3521 }
3522
3523 if (a->key) {
3524 r = crypto_shash_setkey(*hash, a->key, a->key_size);
3525 if (r) {
3526 *error = error_key;
3527 return r;
3528 }
e16b4f99
MB		 3529 } else if (crypto_shash_get_flags(*hash) & CRYPTO_TFM_NEED_KEY) {
3530 *error = error_key;
3531 return -ENOKEY;
7eada909
MP		 3532 }
3533 }
3534
3535 return 0;
3536}
3537
1aa0efd4
MS		 3538static int create_journal(struct dm_integrity_c *ic, char **error)
3539{
3540 int r = 0;
3541 unsigned i;
3542 __u64 journal_pages, journal_desc_size, journal_tree_size;
717f4b1c
MP		 3543 unsigned char *crypt_data = NULL, *crypt_iv = NULL;
3544 struct skcipher_request *req = NULL;
56b67a4f
MP		 3545
3546 ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL);
3547 ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL);
3548 ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL);
3549 ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL);
1aa0efd4
MS		 3550
3551 journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
3552 PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
3553 journal_desc_size = journal_pages * sizeof(struct page_list);
ca79b0c2 3554 if (journal_pages >= totalram_pages() - totalhigh_pages() || journal_desc_size > ULONG_MAX) {
1aa0efd4
MS		 3555 *error = "Journal doesn't fit into memory";
3556 r = -ENOMEM;
3557 goto bad;
3558 }
3559 ic->journal_pages = journal_pages;
3560
d5027e03 3561 ic->journal = dm_integrity_alloc_page_list(ic->journal_pages);
1aa0efd4
MS		 3562 if (!ic->journal) {
3563 *error = "Could not allocate memory for journal";
3564 r = -ENOMEM;
3565 goto bad;
3566 }
3567 if (ic->journal_crypt_alg.alg_string) {
3568 unsigned ivsize, blocksize;
3569 struct journal_completion comp;
3570
3571 comp.ic = ic;
a7a10bce 3572 ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
1aa0efd4
MS		 3573 if (IS_ERR(ic->journal_crypt)) {
3574 *error = "Invalid journal cipher";
3575 r = PTR_ERR(ic->journal_crypt);
3576 ic->journal_crypt = NULL;
3577 goto bad;
3578 }
3579 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
3580 blocksize = crypto_skcipher_blocksize(ic->journal_crypt);
3581
3582 if (ic->journal_crypt_alg.key) {
3583 r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key,
3584 ic->journal_crypt_alg.key_size);
3585 if (r) {
3586 *error = "Error setting encryption key";
3587 goto bad;
3588 }
3589 }
3590 DEBUG_print("cipher %s, block size %u iv size %u\n",
3591 ic->journal_crypt_alg.alg_string, blocksize, ivsize);
3592
d5027e03 3593 ic->journal_io = dm_integrity_alloc_page_list(ic->journal_pages);
1aa0efd4
MS		 3594 if (!ic->journal_io) {
3595 *error = "Could not allocate memory for journal io";
3596 r = -ENOMEM;
3597 goto bad;
3598 }
3599
3600 if (blocksize == 1) {
3601 struct scatterlist *sg;
717f4b1c
MP		 3602
3603 req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3604 if (!req) {
3605 *error = "Could not allocate crypt request";
3606 r = -ENOMEM;
3607 goto bad;
3608 }
3609
131670c2 3610 crypt_iv = kzalloc(ivsize, GFP_KERNEL);
717f4b1c
MP		 3611 if (!crypt_iv) {
3612 *error = "Could not allocate iv";
3613 r = -ENOMEM;
3614 goto bad;
3615 }
1aa0efd4 3616
d5027e03 3617 ic->journal_xor = dm_integrity_alloc_page_list(ic->journal_pages);
1aa0efd4
MS		 3618 if (!ic->journal_xor) {
3619 *error = "Could not allocate memory for journal xor";
3620 r = -ENOMEM;
3621 goto bad;
3622 }
3623
344476e1
KC		 3624 sg = kvmalloc_array(ic->journal_pages + 1,
3625 sizeof(struct scatterlist),
3626 GFP_KERNEL);
1aa0efd4
MS		 3627 if (!sg) {
3628 *error = "Unable to allocate sg list";
3629 r = -ENOMEM;
3630 goto bad;
3631 }
3632 sg_init_table(sg, ic->journal_pages + 1);
3633 for (i = 0; i < ic->journal_pages; i++) {
3634 char *va = lowmem_page_address(ic->journal_xor[i].page);
3635 clear_page(va);
3636 sg_set_buf(&sg[i], va, PAGE_SIZE);
3637 }
3638 sg_set_buf(&sg[i], &ic->commit_ids, sizeof ic->commit_ids);
1aa0efd4 3639
05d6909e
MS		 3640 skcipher_request_set_crypt(req, sg, sg,
3641 PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, crypt_iv);
b5e8ad92 3642 init_completion(&comp.comp);
1aa0efd4
MS		 3643 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3644 if (do_crypt(true, req, &comp))
3645 wait_for_completion(&comp.comp);
3646 kvfree(sg);
3647 r = dm_integrity_failed(ic);
3648 if (r) {
3649 *error = "Unable to encrypt journal";
3650 goto bad;
3651 }
3652 DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data");
3653
3654 crypto_free_skcipher(ic->journal_crypt);
3655 ic->journal_crypt = NULL;
3656 } else {
1aa0efd4 3657 unsigned crypt_len = roundup(ivsize, blocksize);
56b67a4f 3658
717f4b1c
MP		 3659 req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3660 if (!req) {
3661 *error = "Could not allocate crypt request";
3662 r = -ENOMEM;
3663 goto bad;
3664 }
3665
3666 crypt_iv = kmalloc(ivsize, GFP_KERNEL);
3667 if (!crypt_iv) {
3668 *error = "Could not allocate iv";
3669 r = -ENOMEM;
3670 goto bad;
3671 }
3672
56b67a4f
MP		 3673 crypt_data = kmalloc(crypt_len, GFP_KERNEL);
3674 if (!crypt_data) {
3675 *error = "Unable to allocate crypt data";
3676 r = -ENOMEM;
3677 goto bad;
3678 }
1aa0efd4 3679
1aa0efd4
MS		 3680 ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal);
3681 if (!ic->journal_scatterlist) {
3682 *error = "Unable to allocate sg list";
3683 r = -ENOMEM;
3684 goto bad;
3685 }
3686 ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io);
3687 if (!ic->journal_io_scatterlist) {
3688 *error = "Unable to allocate sg list";
3689 r = -ENOMEM;
3690 goto bad;
3691 }
344476e1
KC		 3692 ic->sk_requests = kvmalloc_array(ic->journal_sections,
3693 sizeof(struct skcipher_request *),
3694 GFP_KERNEL | __GFP_ZERO);
1aa0efd4
MS		 3695 if (!ic->sk_requests) {
3696 *error = "Unable to allocate sk requests";
3697 r = -ENOMEM;
3698 goto bad;
3699 }
3700 for (i = 0; i < ic->journal_sections; i++) {
3701 struct scatterlist sg;
3702 struct skcipher_request *section_req;
3703 __u32 section_le = cpu_to_le32(i);
3704
717f4b1c 3705 memset(crypt_iv, 0x00, ivsize);
1aa0efd4
MS		 3706 memset(crypt_data, 0x00, crypt_len);
3707 memcpy(crypt_data, &section_le, min((size_t)crypt_len, sizeof(section_le)));
3708
3709 sg_init_one(&sg, crypt_data, crypt_len);
717f4b1c 3710 skcipher_request_set_crypt(req, &sg, &sg, crypt_len, crypt_iv);
b5e8ad92 3711 init_completion(&comp.comp);
1aa0efd4
MS		 3712 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3713 if (do_crypt(true, req, &comp))
3714 wait_for_completion(&comp.comp);
3715
3716 r = dm_integrity_failed(ic);
3717 if (r) {
3718 *error = "Unable to generate iv";
3719 goto bad;
3720 }
3721
3722 section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3723 if (!section_req) {
3724 *error = "Unable to allocate crypt request";
3725 r = -ENOMEM;
3726 goto bad;
3727 }
6da2ec56
KC		 3728 section_req->iv = kmalloc_array(ivsize, 2,
3729 GFP_KERNEL);
1aa0efd4
MS		 3730 if (!section_req->iv) {
3731 skcipher_request_free(section_req);
3732 *error = "Unable to allocate iv";
3733 r = -ENOMEM;
3734 goto bad;
3735 }
3736 memcpy(section_req->iv + ivsize, crypt_data, ivsize);
3737 section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT;
3738 ic->sk_requests[i] = section_req;
3739 DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i);
3740 }
3741 }
3742 }
3743
3744 for (i = 0; i < N_COMMIT_IDS; i++) {
3745 unsigned j;
3746retest_commit_id:
3747 for (j = 0; j < i; j++) {
3748 if (ic->commit_ids[j] == ic->commit_ids[i]) {
3749 ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1);
3750 goto retest_commit_id;
3751 }
3752 }
3753 DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]);
3754 }
3755
3756 journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node);
3757 if (journal_tree_size > ULONG_MAX) {
3758 *error = "Journal doesn't fit into memory";
3759 r = -ENOMEM;
3760 goto bad;
3761 }
702a6204 3762 ic->journal_tree = kvmalloc(journal_tree_size, GFP_KERNEL);
1aa0efd4
MS		 3763 if (!ic->journal_tree) {
3764 *error = "Could not allocate memory for journal tree";
3765 r = -ENOMEM;
3766 }
3767bad:
56b67a4f 3768 kfree(crypt_data);
717f4b1c
MP		 3769 kfree(crypt_iv);
3770 skcipher_request_free(req);
3771
1aa0efd4
MS		 3772 return r;
3773}
3774
7eada909 3775/*
56b67a4f 3776 * Construct a integrity mapping
7eada909
MP		 3777 *
3778 * Arguments:
3779 * device
3780 * offset from the start of the device
3781 * tag size
468dfca3 3782 * D - direct writes, J - journal writes, B - bitmap mode, R - recovery mode
7eada909
MP		 3783 * number of optional arguments
3784 * optional arguments:
56b67a4f
MP		 3785 * journal_sectors
3786 * interleave_sectors
3787 * buffer_sectors
3788 * journal_watermark
3789 * commit_time
88ad5d1e
MP		 3790 * meta_device
3791 * block_size
468dfca3
MP		 3792 * sectors_per_bit
3793 * bitmap_flush_interval
56b67a4f
MP		 3794 * internal_hash
3795 * journal_crypt
3796 * journal_mac
88ad5d1e 3797 * recalculate
7eada909
MP		 3798 */
3799static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
3800{
3801 struct dm_integrity_c *ic;
3802 char dummy;
3803 int r;
7eada909
MP		 3804 unsigned extra_args;
3805 struct dm_arg_set as;
5916a22b 3806 static const struct dm_arg _args[] = {
5c024064 3807 {0, 16, "Invalid number of feature args"},
7eada909
MP		 3808 };
3809 unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
3810 bool should_write_sb;
7eada909
MP		 3811 __u64 threshold;
3812 unsigned long long start;
468dfca3
MP		 3813 __s8 log2_sectors_per_bitmap_bit = -1;
3814 __s8 log2_blocks_per_bitmap_bit;
3815 __u64 bits_in_journal;
3816 __u64 n_bitmap_bits;
7eada909
MP		 3817
3818#define DIRECT_ARGUMENTS 4
3819
3820 if (argc <= DIRECT_ARGUMENTS) {
3821 ti->error = "Invalid argument count";
3822 return -EINVAL;
3823 }
3824
3825 ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL);
3826 if (!ic) {
3827 ti->error = "Cannot allocate integrity context";
3828 return -ENOMEM;
3829 }
3830 ti->private = ic;
3831 ti->per_io_data_size = sizeof(struct dm_integrity_io);
adc0daad 3832 ic->ti = ti;
7eada909 3833
7eada909 3834 ic->in_progress = RB_ROOT;
724376a0 3835 INIT_LIST_HEAD(&ic->wait_list);
7eada909
MP		 3836 init_waitqueue_head(&ic->endio_wait);
3837 bio_list_init(&ic->flush_bio_list);
3838 init_waitqueue_head(&ic->copy_to_journal_wait);
3839 init_completion(&ic->crypto_backoff);
3f2e5393 3840 atomic64_set(&ic->number_of_mismatches, 0);
468dfca3 3841 ic->bitmap_flush_interval = BITMAP_FLUSH_INTERVAL;
7eada909
MP		 3842
3843 r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
3844 if (r) {
3845 ti->error = "Device lookup failed";
3846 goto bad;
3847 }
3848
3849 if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) {
3850 ti->error = "Invalid starting offset";
3851 r = -EINVAL;
3852 goto bad;
3853 }
3854 ic->start = start;
3855
3856 if (strcmp(argv[2], "-")) {
3857 if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) {
3858 ti->error = "Invalid tag size";
3859 r = -EINVAL;
3860 goto bad;
3861 }
3862 }
3863
05d6909e
MS		 3864 if (!strcmp(argv[3], "J") || !strcmp(argv[3], "B") ||
3865 !strcmp(argv[3], "D") || !strcmp(argv[3], "R")) {
7eada909 3866 ic->mode = argv[3][0];
468dfca3
MP		 3867 } else {
3868 ti->error = "Invalid mode (expecting J, B, D, R)";
7eada909
MP		 3869 r = -EINVAL;
3870 goto bad;
3871 }
3872
356d9d52 3873 journal_sectors = 0;
7eada909
MP		 3874 interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
3875 buffer_sectors = DEFAULT_BUFFER_SECTORS;
3876 journal_watermark = DEFAULT_JOURNAL_WATERMARK;
3877 sync_msec = DEFAULT_SYNC_MSEC;
9d609f85 3878 ic->sectors_per_block = 1;
7eada909
MP		 3879
3880 as.argc = argc - DIRECT_ARGUMENTS;
3881 as.argv = argv + DIRECT_ARGUMENTS;
3882 r = dm_read_arg_group(_args, &as, &extra_args, &ti->error);
3883 if (r)
3884 goto bad;
3885
3886 while (extra_args--) {
3887 const char *opt_string;
3888 unsigned val;
468dfca3 3889 unsigned long long llval;
7eada909
MP		 3890 opt_string = dm_shift_arg(&as);
3891 if (!opt_string) {
3892 r = -EINVAL;
3893 ti->error = "Not enough feature arguments";
3894 goto bad;
3895 }
56b67a4f 3896 if (sscanf(opt_string, "journal_sectors:%u%c", &val, &dummy) == 1)
356d9d52 3897 journal_sectors = val ? val : 1;
56b67a4f 3898 else if (sscanf(opt_string, "interleave_sectors:%u%c", &val, &dummy) == 1)
7eada909 3899 interleave_sectors = val;
56b67a4f 3900 else if (sscanf(opt_string, "buffer_sectors:%u%c", &val, &dummy) == 1)
7eada909 3901 buffer_sectors = val;
56b67a4f 3902 else if (sscanf(opt_string, "journal_watermark:%u%c", &val, &dummy) == 1 && val <= 100)
7eada909 3903 journal_watermark = val;
56b67a4f 3904 else if (sscanf(opt_string, "commit_time:%u%c", &val, &dummy) == 1)
7eada909 3905 sync_msec = val;
0d74e6a3 3906 else if (!strncmp(opt_string, "meta_device:", strlen("meta_device:"))) {
356d9d52
MP		 3907 if (ic->meta_dev) {
3908 dm_put_device(ti, ic->meta_dev);
3909 ic->meta_dev = NULL;
3910 }
05d6909e
MS		 3911 r = dm_get_device(ti, strchr(opt_string, ':') + 1,
3912 dm_table_get_mode(ti->table), &ic->meta_dev);
356d9d52
MP		 3913 if (r) {
3914 ti->error = "Device lookup failed";
3915 goto bad;
3916 }
3917 } else if (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) {
9d609f85
MP		 3918 if (val < 1 << SECTOR_SHIFT ||
3919 val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT ||
3920 (val & (val -1))) {
3921 r = -EINVAL;
3922 ti->error = "Invalid block_size argument";
3923 goto bad;
3924 }
3925 ic->sectors_per_block = val >> SECTOR_SHIFT;
468dfca3
MP		 3926 } else if (sscanf(opt_string, "sectors_per_bit:%llu%c", &llval, &dummy) == 1) {
3927 log2_sectors_per_bitmap_bit = !llval ? 0 : __ilog2_u64(llval);
3928 } else if (sscanf(opt_string, "bitmap_flush_interval:%u%c", &val, &dummy) == 1) {
3929 if (val >= (uint64_t)UINT_MAX * 1000 / HZ) {
3930 r = -EINVAL;
3931 ti->error = "Invalid bitmap_flush_interval argument";
3932 }
3933 ic->bitmap_flush_interval = msecs_to_jiffies(val);
0d74e6a3 3934 } else if (!strncmp(opt_string, "internal_hash:", strlen("internal_hash:"))) {
7eada909 3935 r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error,
56b67a4f 3936 "Invalid internal_hash argument");
7eada909
MP		 3937 if (r)
3938 goto bad;
0d74e6a3 3939 } else if (!strncmp(opt_string, "journal_crypt:", strlen("journal_crypt:"))) {
7eada909 3940 r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error,
56b67a4f 3941 "Invalid journal_crypt argument");
7eada909
MP		 3942 if (r)
3943 goto bad;
0d74e6a3 3944 } else if (!strncmp(opt_string, "journal_mac:", strlen("journal_mac:"))) {
7eada909 3945 r = get_alg_and_key(opt_string, &ic->journal_mac_alg, &ti->error,
56b67a4f 3946 "Invalid journal_mac argument");
7eada909
MP		 3947 if (r)
3948 goto bad;
a3fcf725 3949 } else if (!strcmp(opt_string, "recalculate")) {
468dfca3 3950 ic->recalculate_flag = true;
84597a44
MP		 3951 } else if (!strcmp(opt_string, "allow_discards")) {
3952 ic->discard = true;
d537858a
MP		 3953 } else if (!strcmp(opt_string, "fix_padding")) {
3954 ic->fix_padding = true;
5c024064
MP		 3955 } else if (!strcmp(opt_string, "legacy_recalculate")) {
3956 ic->legacy_recalculate = true;
7eada909
MP		 3957 } else {
3958 r = -EINVAL;
3959 ti->error = "Invalid argument";
3960 goto bad;
3961 }
3962 }
3963
356d9d52
MP		 3964 ic->data_device_sectors = i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT;
3965 if (!ic->meta_dev)
3966 ic->meta_device_sectors = ic->data_device_sectors;
3967 else
3968 ic->meta_device_sectors = i_size_read(ic->meta_dev->bdev->bd_inode) >> SECTOR_SHIFT;
3969
3970 if (!journal_sectors) {
3971 journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS,
05d6909e 3972 ic->data_device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR);
356d9d52
MP		 3973 }
3974
3975 if (!buffer_sectors)
3976 buffer_sectors = 1;
3977 ic->log2_buffer_sectors = min((int)__fls(buffer_sectors), 31 - SECTOR_SHIFT);
3978
7eada909
MP		 3979 r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error,
3980 "Invalid internal hash", "Error setting internal hash key");
3981 if (r)
3982 goto bad;
3983
3984 r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error,
3985 "Invalid journal mac", "Error setting journal mac key");
3986 if (r)
3987 goto bad;
3988
3989 if (!ic->tag_size) {
3990 if (!ic->internal_hash) {
3991 ti->error = "Unknown tag size";
3992 r = -EINVAL;
3993 goto bad;
3994 }
3995 ic->tag_size = crypto_shash_digestsize(ic->internal_hash);
3996 }
3997 if (ic->tag_size > MAX_TAG_SIZE) {
3998 ti->error = "Too big tag size";
3999 r = -EINVAL;
4000 goto bad;
4001 }
4002 if (!(ic->tag_size & (ic->tag_size - 1)))
4003 ic->log2_tag_size = __ffs(ic->tag_size);
4004 else
4005 ic->log2_tag_size = -1;
4006
468dfca3
MP		 4007 if (ic->mode == 'B' && !ic->internal_hash) {
4008 r = -EINVAL;
4009 ti->error = "Bitmap mode can be only used with internal hash";
4010 goto bad;
4011 }
4012
84597a44
MP		 4013 if (ic->discard && !ic->internal_hash) {
4014 r = -EINVAL;
4015 ti->error = "Discard can be only used with internal hash";
4016 goto bad;
4017 }
4018
7eada909
MP		 4019 ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
4020 ic->autocommit_msec = sync_msec;
8376d3c1 4021 timer_setup(&ic->autocommit_timer, autocommit_fn, 0);
7eada909
MP		 4022
4023 ic->io = dm_io_client_create();
4024 if (IS_ERR(ic->io)) {
4025 r = PTR_ERR(ic->io);
4026 ic->io = NULL;
4027 ti->error = "Cannot allocate dm io";
4028 goto bad;
4029 }
4030
6f1c819c
KO		 4031 r = mempool_init_slab_pool(&ic->journal_io_mempool, JOURNAL_IO_MEMPOOL, journal_io_cache);
4032 if (r) {
7eada909
MP		 4033 ti->error = "Cannot allocate mempool";
4034 goto bad;
4035 }
4036
4037 ic->metadata_wq = alloc_workqueue("dm-integrity-metadata",
4038 WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE);
4039 if (!ic->metadata_wq) {
4040 ti->error = "Cannot allocate workqueue";
4041 r = -ENOMEM;
4042 goto bad;
4043 }
4044
4045 /*
4046 * If this workqueue were percpu, it would cause bio reordering
4047 * and reduced performance.
4048 */
4049 ic->wait_wq = alloc_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4050 if (!ic->wait_wq) {
4051 ti->error = "Cannot allocate workqueue";
4052 r = -ENOMEM;
4053 goto bad;
4054 }
4055
53770f0e
MP		 4056 ic->offload_wq = alloc_workqueue("dm-integrity-offload", WQ_MEM_RECLAIM,
4057 METADATA_WORKQUEUE_MAX_ACTIVE);
4058 if (!ic->offload_wq) {
4059 ti->error = "Cannot allocate workqueue";
4060 r = -ENOMEM;
4061 goto bad;
4062 }
4063
7eada909
MP		 4064 ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1);
4065 if (!ic->commit_wq) {
4066 ti->error = "Cannot allocate workqueue";
4067 r = -ENOMEM;
4068 goto bad;
4069 }
4070 INIT_WORK(&ic->commit_work, integrity_commit);
4071
468dfca3 4072 if (ic->mode == 'J' || ic->mode == 'B') {
7eada909
MP		 4073 ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1);
4074 if (!ic->writer_wq) {
4075 ti->error = "Cannot allocate workqueue";
4076 r = -ENOMEM;
4077 goto bad;
4078 }
4079 INIT_WORK(&ic->writer_work, integrity_writer);
4080 }
4081
4082 ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL);
4083 if (!ic->sb) {
4084 r = -ENOMEM;
4085 ti->error = "Cannot allocate superblock area";
4086 goto bad;
4087 }
4088
4089 r = sync_rw_sb(ic, REQ_OP_READ, 0);
4090 if (r) {
4091 ti->error = "Error reading superblock";
4092 goto bad;
4093 }
c2bcb2b7
MP		 4094 should_write_sb = false;
4095 if (memcmp(ic->sb->magic, SB_MAGIC, 8)) {
4096 if (ic->mode != 'R') {
56b67a4f
MP		 4097 if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) {
4098 r = -EINVAL;
4099 ti->error = "The device is not initialized";
4100 goto bad;
7eada909
MP		 4101 }
4102 }
4103
4104 r = initialize_superblock(ic, journal_sectors, interleave_sectors);
4105 if (r) {
4106 ti->error = "Could not initialize superblock";
4107 goto bad;
4108 }
c2bcb2b7
MP		 4109 if (ic->mode != 'R')
4110 should_write_sb = true;
7eada909
MP		 4111 }
4112
d537858a 4113 if (!ic->sb->version || ic->sb->version > SB_VERSION_4) {
7eada909
MP		 4114 r = -EINVAL;
4115 ti->error = "Unknown version";
4116 goto bad;
4117 }
4118 if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) {
4119 r = -EINVAL;
9d609f85
MP		 4120 ti->error = "Tag size doesn't match the information in superblock";
4121 goto bad;
4122 }
4123 if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) {
4124 r = -EINVAL;
4125 ti->error = "Block size doesn't match the information in superblock";
7eada909
MP		 4126 goto bad;
4127 }
bc86a41e
MP		 4128 if (!le32_to_cpu(ic->sb->journal_sections)) {
4129 r = -EINVAL;
4130 ti->error = "Corrupted superblock, journal_sections is 0";
4131 goto bad;
4132 }
7eada909 4133 /* make sure that ti->max_io_len doesn't overflow */
356d9d52
MP		 4134 if (!ic->meta_dev) {
4135 if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS ||
4136 ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) {
4137 r = -EINVAL;
4138 ti->error = "Invalid interleave_sectors in the superblock";
4139 goto bad;
4140 }
4141 } else {
4142 if (ic->sb->log2_interleave_sectors) {
4143 r = -EINVAL;
4144 ti->error = "Invalid interleave_sectors in the superblock";
4145 goto bad;
4146 }
7eada909 4147 }
1ac2c15a 4148 if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
7eada909 4149 r = -EINVAL;
1ac2c15a 4150 ti->error = "Journal mac mismatch";
7eada909
MP		 4151 goto bad;
4152 }
1ac2c15a
MP		 4153
4154 get_provided_data_sectors(ic);
4155 if (!ic->provided_data_sectors) {
7eada909 4156 r = -EINVAL;
1ac2c15a 4157 ti->error = "The device is too small";
7eada909
MP		 4158 goto bad;
4159 }
356d9d52
MP		 4160
4161try_smaller_buffer:
7eada909
MP		 4162 r = calculate_device_limits(ic);
4163 if (r) {
356d9d52
MP		 4164 if (ic->meta_dev) {
4165 if (ic->log2_buffer_sectors > 3) {
4166 ic->log2_buffer_sectors--;
4167 goto try_smaller_buffer;
4168 }
4169 }
7eada909
MP		 4170 ti->error = "The device is too small";
4171 goto bad;
4172 }
468dfca3
MP		 4173
4174 if (log2_sectors_per_bitmap_bit < 0)
4175 log2_sectors_per_bitmap_bit = __fls(DEFAULT_SECTORS_PER_BITMAP_BIT);
4176 if (log2_sectors_per_bitmap_bit < ic->sb->log2_sectors_per_block)
4177 log2_sectors_per_bitmap_bit = ic->sb->log2_sectors_per_block;
4178
4179 bits_in_journal = ((__u64)ic->journal_section_sectors * ic->journal_sections) << (SECTOR_SHIFT + 3);
4180 if (bits_in_journal > UINT_MAX)
4181 bits_in_journal = UINT_MAX;
4182 while (bits_in_journal < (ic->provided_data_sectors + ((sector_t)1 << log2_sectors_per_bitmap_bit) - 1) >> log2_sectors_per_bitmap_bit)
4183 log2_sectors_per_bitmap_bit++;
4184
4185 log2_blocks_per_bitmap_bit = log2_sectors_per_bitmap_bit - ic->sb->log2_sectors_per_block;
4186 ic->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
4187 if (should_write_sb) {
4188 ic->sb->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
4189 }
4190 n_bitmap_bits = ((ic->provided_data_sectors >> ic->sb->log2_sectors_per_block)
4191 + (((sector_t)1 << log2_blocks_per_bitmap_bit) - 1)) >> log2_blocks_per_bitmap_bit;
4192 ic->n_bitmap_blocks = DIV_ROUND_UP(n_bitmap_bits, BITMAP_BLOCK_SIZE * 8);
4193
356d9d52
MP		 4194 if (!ic->meta_dev)
4195 ic->log2_buffer_sectors = min(ic->log2_buffer_sectors, (__u8)__ffs(ic->metadata_run));
4196
2ad50606
OM		 4197 if (ti->len > ic->provided_data_sectors) {
4198 r = -EINVAL;
4199 ti->error = "Not enough provided sectors for requested mapping size";
4200 goto bad;
4201 }
7eada909 4202
7eada909
MP		 4203
4204 threshold = (__u64)ic->journal_entries * (100 - journal_watermark);
4205 threshold += 50;
4206 do_div(threshold, 100);
4207 ic->free_sectors_threshold = threshold;
4208
4209 DEBUG_print("initialized:\n");
4210 DEBUG_print(" integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size));
4211 DEBUG_print(" journal_entry_size %u\n", ic->journal_entry_size);
4212 DEBUG_print(" journal_entries_per_sector %u\n", ic->journal_entries_per_sector);
4213 DEBUG_print(" journal_section_entries %u\n", ic->journal_section_entries);
4214 DEBUG_print(" journal_section_sectors %u\n", ic->journal_section_sectors);
4215 DEBUG_print(" journal_sections %u\n", (unsigned)le32_to_cpu(ic->sb->journal_sections));
4216 DEBUG_print(" journal_entries %u\n", ic->journal_entries);
4217 DEBUG_print(" log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors);
468dfca3 4218 DEBUG_print(" data_device_sectors 0x%llx\n", i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT);
7eada909
MP		 4219 DEBUG_print(" initial_sectors 0x%x\n", ic->initial_sectors);
4220 DEBUG_print(" metadata_run 0x%x\n", ic->metadata_run);
4221 DEBUG_print(" log2_metadata_run %d\n", ic->log2_metadata_run);
7649194a 4222 DEBUG_print(" provided_data_sectors 0x%llx (%llu)\n", ic->provided_data_sectors, ic->provided_data_sectors);
7eada909 4223 DEBUG_print(" log2_buffer_sectors %u\n", ic->log2_buffer_sectors);
7649194a 4224 DEBUG_print(" bits_in_journal %llu\n", bits_in_journal);
7eada909 4225
468dfca3 4226 if (ic->recalculate_flag && !(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))) {
a3fcf725
MP		 4227 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
4228 ic->sb->recalc_sector = cpu_to_le64(0);
4229 }
4230
468dfca3 4231 if (ic->internal_hash) {
e8c2566f 4232 ic->recalc_wq = alloc_workqueue("dm-integrity-recalc", WQ_MEM_RECLAIM, 1);
a3fcf725
MP		 4233 if (!ic->recalc_wq ) {
4234 ti->error = "Cannot allocate workqueue";
4235 r = -ENOMEM;
4236 goto bad;
4237 }
4238 INIT_WORK(&ic->recalc_work, integrity_recalc);
4239 ic->recalc_buffer = vmalloc(RECALC_SECTORS << SECTOR_SHIFT);
4240 if (!ic->recalc_buffer) {
4241 ti->error = "Cannot allocate buffer for recalculating";
4242 r = -ENOMEM;
4243 goto bad;
4244 }
329e0989
KC		 4245 ic->recalc_tags = kvmalloc_array(RECALC_SECTORS >> ic->sb->log2_sectors_per_block,
4246 ic->tag_size, GFP_KERNEL);
a3fcf725
MP		 4247 if (!ic->recalc_tags) {
4248 ti->error = "Cannot allocate tags for recalculating";
4249 r = -ENOMEM;
4250 goto bad;
4251 }
2d06dfec
MP		 4252 } else {
4253 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
4254 ti->error = "Recalculate can only be specified with internal_hash";
4255 r = -EINVAL;
4256 goto bad;
4257 }
a3fcf725
MP		 4258 }
4259
5c024064
MP		 4260 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
4261 le64_to_cpu(ic->sb->recalc_sector) < ic->provided_data_sectors &&
4262 dm_integrity_disable_recalculate(ic)) {
4263 ti->error = "Recalculating with HMAC is disabled for security reasons - if you really need it, use the argument \"legacy_recalculate\"";
4264 r = -EOPNOTSUPP;
4265 goto bad;
4266 }
4267
356d9d52
MP		 4268 ic->bufio = dm_bufio_client_create(ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev,
4269 1U << (SECTOR_SHIFT + ic->log2_buffer_sectors), 1, 0, NULL, NULL);
7eada909
MP		 4270 if (IS_ERR(ic->bufio)) {
4271 r = PTR_ERR(ic->bufio);
4272 ti->error = "Cannot initialize dm-bufio";
4273 ic->bufio = NULL;
4274 goto bad;
4275 }
4276 dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors);
4277
c2bcb2b7
MP		 4278 if (ic->mode != 'R') {
4279 r = create_journal(ic, &ti->error);
4280 if (r)
4281 goto bad;
468dfca3
MP		 4282
4283 }
4284
4285 if (ic->mode == 'B') {
4286 unsigned i;
4287 unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
4288
4289 ic->recalc_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4290 if (!ic->recalc_bitmap) {
4291 r = -ENOMEM;
4292 goto bad;
4293 }
4294 ic->may_write_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4295 if (!ic->may_write_bitmap) {
4296 r = -ENOMEM;
4297 goto bad;
4298 }
4299 ic->bbs = kvmalloc_array(ic->n_bitmap_blocks, sizeof(struct bitmap_block_status), GFP_KERNEL);
4300 if (!ic->bbs) {
4301 r = -ENOMEM;
4302 goto bad;
4303 }
4304 INIT_DELAYED_WORK(&ic->bitmap_flush_work, bitmap_flush_work);
4305 for (i = 0; i < ic->n_bitmap_blocks; i++) {
4306 struct bitmap_block_status *bbs = &ic->bbs[i];
4307 unsigned sector, pl_index, pl_offset;
4308
4309 INIT_WORK(&bbs->work, bitmap_block_work);
4310 bbs->ic = ic;
4311 bbs->idx = i;
4312 bio_list_init(&bbs->bio_queue);
4313 spin_lock_init(&bbs->bio_queue_lock);
4314
4315 sector = i * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT);
4316 pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
4317 pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
4318
4319 bbs->bitmap = lowmem_page_address(ic->journal[pl_index].page) + pl_offset;
4320 }
c2bcb2b7 4321 }
7eada909
MP		 4322
4323 if (should_write_sb) {
4324 int r;
4325
4326 init_journal(ic, 0, ic->journal_sections, 0);
4327 r = dm_integrity_failed(ic);
4328 if (unlikely(r)) {
4329 ti->error = "Error initializing journal";
4330 goto bad;
4331 }
4332 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
4333 if (r) {
4334 ti->error = "Error initializing superblock";
4335 goto bad;
4336 }
4337 ic->just_formatted = true;
4338 }
4339
356d9d52
MP		 4340 if (!ic->meta_dev) {
4341 r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors);
4342 if (r)
4343 goto bad;
4344 }
468dfca3
MP		 4345 if (ic->mode == 'B') {
4346 unsigned max_io_len = ((sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit) * (BITMAP_BLOCK_SIZE * 8);
4347 if (!max_io_len)
4348 max_io_len = 1U << 31;
4349 DEBUG_print("max_io_len: old %u, new %u\n", ti->max_io_len, max_io_len);
4350 if (!ti->max_io_len || ti->max_io_len > max_io_len) {
4351 r = dm_set_target_max_io_len(ti, max_io_len);
4352 if (r)
4353 goto bad;
4354 }
4355 }
7eada909
MP		 4356
4357 if (!ic->internal_hash)
4358 dm_integrity_set(ti, ic);
4359
4360 ti->num_flush_bios = 1;
4361 ti->flush_supported = true;
84597a44
MP		 4362 if (ic->discard)
4363 ti->num_discard_bios = 1;
7eada909
MP		 4364
4365 return 0;
468dfca3 4366
7eada909
MP		 4367bad:
4368 dm_integrity_dtr(ti);
4369 return r;
4370}
4371
4372static void dm_integrity_dtr(struct dm_target *ti)
4373{
4374 struct dm_integrity_c *ic = ti->private;
4375
4376 BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
724376a0 4377 BUG_ON(!list_empty(&ic->wait_list));
7eada909
MP		 4378
4379 if (ic->metadata_wq)
4380 destroy_workqueue(ic->metadata_wq);
4381 if (ic->wait_wq)
4382 destroy_workqueue(ic->wait_wq);
53770f0e
MP		 4383 if (ic->offload_wq)
4384 destroy_workqueue(ic->offload_wq);
7eada909
MP		 4385 if (ic->commit_wq)
4386 destroy_workqueue(ic->commit_wq);
4387 if (ic->writer_wq)
4388 destroy_workqueue(ic->writer_wq);
a3fcf725
MP		 4389 if (ic->recalc_wq)
4390 destroy_workqueue(ic->recalc_wq);
97abfde1
MP		 4391 vfree(ic->recalc_buffer);
4392 kvfree(ic->recalc_tags);
468dfca3 4393 kvfree(ic->bbs);
7eada909
MP		 4394 if (ic->bufio)
4395 dm_bufio_client_destroy(ic->bufio);
6f1c819c 4396 mempool_exit(&ic->journal_io_mempool);
7eada909
MP		 4397 if (ic->io)
4398 dm_io_client_destroy(ic->io);
4399 if (ic->dev)
4400 dm_put_device(ti, ic->dev);
356d9d52
MP		 4401 if (ic->meta_dev)
4402 dm_put_device(ti, ic->meta_dev);
d5027e03
MP		 4403 dm_integrity_free_page_list(ic->journal);
4404 dm_integrity_free_page_list(ic->journal_io);
4405 dm_integrity_free_page_list(ic->journal_xor);
468dfca3
MP		 4406 dm_integrity_free_page_list(ic->recalc_bitmap);
4407 dm_integrity_free_page_list(ic->may_write_bitmap);
7eada909
MP		 4408 if (ic->journal_scatterlist)
4409 dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist);
4410 if (ic->journal_io_scatterlist)
4411 dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist);
4412 if (ic->sk_requests) {
4413 unsigned i;
4414
4415 for (i = 0; i < ic->journal_sections; i++) {
4416 struct skcipher_request *req = ic->sk_requests[i];
4417 if (req) {
453431a5 4418 kfree_sensitive(req->iv);
7eada909
MP		 4419 skcipher_request_free(req);
4420 }
4421 }
4422 kvfree(ic->sk_requests);
4423 }
4424 kvfree(ic->journal_tree);
4425 if (ic->sb)
4426 free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT);
4427
4428 if (ic->internal_hash)
4429 crypto_free_shash(ic->internal_hash);
4430 free_alg(&ic->internal_hash_alg);
4431
4432 if (ic->journal_crypt)
4433 crypto_free_skcipher(ic->journal_crypt);
4434 free_alg(&ic->journal_crypt_alg);
4435
4436 if (ic->journal_mac)
4437 crypto_free_shash(ic->journal_mac);
4438 free_alg(&ic->journal_mac_alg);
4439
4440 kfree(ic);
4441}
4442
4443static struct target_type integrity_target = {
4444 .name = "integrity",
1ac2c15a 4445 .version = {1, 6, 0},
7eada909
MP		 4446 .module = THIS_MODULE,
4447 .features = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
4448 .ctr = dm_integrity_ctr,
4449 .dtr = dm_integrity_dtr,
4450 .map = dm_integrity_map,
4451 .postsuspend = dm_integrity_postsuspend,
4452 .resume = dm_integrity_resume,
4453 .status = dm_integrity_status,
4454 .iterate_devices = dm_integrity_iterate_devices,
9d609f85 4455 .io_hints = dm_integrity_io_hints,
7eada909
MP		 4456};
4457
5efedc9b 4458static int __init dm_integrity_init(void)
7eada909
MP		 4459{
4460 int r;
4461
4462 journal_io_cache = kmem_cache_create("integrity_journal_io",
4463 sizeof(struct journal_io), 0, 0, NULL);
4464 if (!journal_io_cache) {
4465 DMERR("can't allocate journal io cache");
4466 return -ENOMEM;
4467 }
4468
4469 r = dm_register_target(&integrity_target);
4470
4471 if (r < 0)
4472 DMERR("register failed %d", r);
4473
4474 return r;
4475}
4476
5efedc9b 4477static void __exit dm_integrity_exit(void)
7eada909
MP		 4478{
4479 dm_unregister_target(&integrity_target);
4480 kmem_cache_destroy(journal_io_cache);
4481}
4482
4483module_init(dm_integrity_init);
4484module_exit(dm_integrity_exit);
4485
4486MODULE_AUTHOR("Milan Broz");
4487MODULE_AUTHOR("Mikulas Patocka");
4488MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension");
4489MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)