drivers/md/dm-integrity.c

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