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/module.h>
  10 #include <linux/device-mapper.h>
  11 #include <linux/dm-io.h>
  12 #include <linux/vmalloc.h>
  13 #include <linux/sort.h>
  14 #include <linux/rbtree.h>
  15 #include <linux/delay.h>
  16 #include <linux/random.h>
  17 #include <crypto/hash.h>
  18 #include <crypto/skcipher.h>
  19 #include <linux/async_tx.h>
  20 #include "dm-bufio.h"
  21
  22 #define DM_MSG_PREFIX "integrity"
  23
  24 #define DEFAULT_INTERLEAVE_SECTORS      32768
  25 #define DEFAULT_JOURNAL_SIZE_FACTOR     7
  26 #define DEFAULT_BUFFER_SECTORS          128
  27 #define DEFAULT_JOURNAL_WATERMARK       50
  28 #define DEFAULT_SYNC_MSEC               10000
  29 #define DEFAULT_MAX_JOURNAL_SECTORS     131072
  30 #define MIN_LOG2_INTERLEAVE_SECTORS     3
  31 #define MAX_LOG2_INTERLEAVE_SECTORS     31
  32 #define METADATA_WORKQUEUE_MAX_ACTIVE   16
  33
  34 /*
  35  * Warning - DEBUG_PRINT prints security-sensitive data to the log,
  36  * so it should not be enabled in the official kernel
  37  */
  38 //#define DEBUG_PRINT
  39 //#define INTERNAL_VERIFY
  40
  41 /*
  42  * On disk structures
  43  */
  44
  45 #define SB_MAGIC                        "integrt"
  46 #define SB_VERSION                      1
  47 #define SB_SECTORS                      8
  48 #define MAX_SECTORS_PER_BLOCK           8
  49
  50 struct superblock {
  51         __u8 magic[8];
  52         __u8 version;
  53         __u8 log2_interleave_sectors;
  54         __u16 integrity_tag_size;
  55         __u32 journal_sections;
  56         __u64 provided_data_sectors;    /* userspace uses this value */
  57         __u32 flags;
  58         __u8 log2_sectors_per_block;
  59 };
  60
  61 #define SB_FLAG_HAVE_JOURNAL_MAC        0x1
  62
  63 #define JOURNAL_ENTRY_ROUNDUP           8
  64
  65 typedef __u64 commit_id_t;
  66 #define JOURNAL_MAC_PER_SECTOR          8
  67
  68 struct journal_entry {
  69         union {
  70                 struct {
  71                         __u32 sector_lo;
  72                         __u32 sector_hi;
  73                 } s;
  74                 __u64 sector;
  75         } u;
  76         commit_id_t last_bytes[0];
  77         /* __u8 tag[0]; */
  78 };
  79
  80 #define journal_entry_tag(ic, je)               ((__u8 *)&(je)->last_bytes[(ic)->sectors_per_block])
  81
  82 #if BITS_PER_LONG == 64
  83 #define journal_entry_set_sector(je, x)         do { smp_wmb(); ACCESS_ONCE((je)->u.sector) = cpu_to_le64(x); } while (0)
  84 #define journal_entry_get_sector(je)            le64_to_cpu((je)->u.sector)
  85 #elif defined(CONFIG_LBDAF)
  86 #define journal_entry_set_sector(je, x)         do { (je)->u.s.sector_lo = cpu_to_le32(x); smp_wmb(); ACCESS_ONCE((je)->u.s.sector_hi) = cpu_to_le32((x) >> 32); } while (0)
  87 #define journal_entry_get_sector(je)            le64_to_cpu((je)->u.sector)
  88 #else
  89 #define journal_entry_set_sector(je, x)         do { (je)->u.s.sector_lo = cpu_to_le32(x); smp_wmb(); ACCESS_ONCE((je)->u.s.sector_hi) = cpu_to_le32(0); } while (0)
  90 #define journal_entry_get_sector(je)            le32_to_cpu((je)->u.s.sector_lo)
  91 #endif
  92 #define journal_entry_is_unused(je)             ((je)->u.s.sector_hi == cpu_to_le32(-1))
  93 #define journal_entry_set_unused(je)            do { ((je)->u.s.sector_hi = cpu_to_le32(-1)); } while (0)
  94 #define journal_entry_is_inprogress(je)         ((je)->u.s.sector_hi == cpu_to_le32(-2))
  95 #define journal_entry_set_inprogress(je)        do { ((je)->u.s.sector_hi = cpu_to_le32(-2)); } while (0)
  96
  97 #define JOURNAL_BLOCK_SECTORS           8
  98 #define JOURNAL_SECTOR_DATA             ((1 << SECTOR_SHIFT) - sizeof(commit_id_t))
  99 #define JOURNAL_MAC_SIZE                (JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS)
 100
 101 struct journal_sector {
 102         __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR];
 103         __u8 mac[JOURNAL_MAC_PER_SECTOR];
 104         commit_id_t commit_id;
 105 };
 106
 107 #define MAX_TAG_SIZE                    (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
 108
 109 #define METADATA_PADDING_SECTORS        8
 110
 111 #define N_COMMIT_IDS                    4
 112
 113 static unsigned char prev_commit_seq(unsigned char seq)
 114 {
 115         return (seq + N_COMMIT_IDS - 1) % N_COMMIT_IDS;
 116 }
 117
 118 static unsigned char next_commit_seq(unsigned char seq)
 119 {
 120         return (seq + 1) % N_COMMIT_IDS;
 121 }
 122
 123 /*
 124  * In-memory structures
 125  */
 126
 127 struct journal_node {
 128         struct rb_node node;
 129         sector_t sector;
 130 };
 131
 132 struct alg_spec {
 133         char *alg_string;
 134         char *key_string;
 135         __u8 *key;
 136         unsigned key_size;
 137 };
 138
 139 struct dm_integrity_c {
 140         struct dm_dev *dev;
 141         unsigned tag_size;
 142         __s8 log2_tag_size;
 143         sector_t start;
 144         mempool_t *journal_io_mempool;
 145         struct dm_io_client *io;
 146         struct dm_bufio_client *bufio;
 147         struct workqueue_struct *metadata_wq;
 148         struct superblock *sb;
 149         unsigned journal_pages;
 150         struct page_list *journal;
 151         struct page_list *journal_io;
 152         struct page_list *journal_xor;
 153
 154         struct crypto_skcipher *journal_crypt;
 155         struct scatterlist **journal_scatterlist;
 156         struct scatterlist **journal_io_scatterlist;
 157         struct skcipher_request **sk_requests;
 158
 159         struct crypto_shash *journal_mac;
 160
 161         struct journal_node *journal_tree;
 162         struct rb_root journal_tree_root;
 163
 164         sector_t provided_data_sectors;
 165
 166         unsigned short journal_entry_size;
 167         unsigned char journal_entries_per_sector;
 168         unsigned char journal_section_entries;
 169         unsigned short journal_section_sectors;
 170         unsigned journal_sections;
 171         unsigned journal_entries;
 172         sector_t device_sectors;
 173         unsigned initial_sectors;
 174         unsigned metadata_run;
 175         __s8 log2_metadata_run;
 176         __u8 log2_buffer_sectors;
 177         __u8 sectors_per_block;
 178
 179         unsigned char mode;
 180         bool suspending;
 181
 182         int failed;
 183
 184         struct crypto_shash *internal_hash;
 185
 186         /* these variables are locked with endio_wait.lock */
 187         struct rb_root in_progress;
 188         wait_queue_head_t endio_wait;
 189         struct workqueue_struct *wait_wq;
 190
 191         unsigned char commit_seq;
 192         commit_id_t commit_ids[N_COMMIT_IDS];
 193
 194         unsigned committed_section;
 195         unsigned n_committed_sections;
 196
 197         unsigned uncommitted_section;
 198         unsigned n_uncommitted_sections;
 199
 200         unsigned free_section;
 201         unsigned char free_section_entry;
 202         unsigned free_sectors;
 203
 204         unsigned free_sectors_threshold;
 205
 206         struct workqueue_struct *commit_wq;
 207         struct work_struct commit_work;
 208
 209         struct workqueue_struct *writer_wq;
 210         struct work_struct writer_work;
 211
 212         struct bio_list flush_bio_list;
 213
 214         unsigned long autocommit_jiffies;
 215         struct timer_list autocommit_timer;
 216         unsigned autocommit_msec;
 217
 218         wait_queue_head_t copy_to_journal_wait;
 219
 220         struct completion crypto_backoff;
 221
 222         bool journal_uptodate;
 223         bool just_formatted;
 224
 225         struct alg_spec internal_hash_alg;
 226         struct alg_spec journal_crypt_alg;
 227         struct alg_spec journal_mac_alg;
 228 };
 229
 230 struct dm_integrity_range {
 231         sector_t logical_sector;
 232         unsigned n_sectors;
 233         struct rb_node node;
 234 };
 235
 236 struct dm_integrity_io {
 237         struct work_struct work;
 238
 239         struct dm_integrity_c *ic;
 240         bool write;
 241         bool fua;
 242
 243         struct dm_integrity_range range;
 244
 245         sector_t metadata_block;
 246         unsigned metadata_offset;
 247
 248         atomic_t in_flight;
 249         blk_status_t bi_status;
 250
 251         struct completion *completion;
 252
 253         struct block_device *orig_bi_bdev;
 254         bio_end_io_t *orig_bi_end_io;
 255         struct bio_integrity_payload *orig_bi_integrity;
 256         struct bvec_iter orig_bi_iter;
 257 };
 258
 259 struct journal_completion {
 260         struct dm_integrity_c *ic;
 261         atomic_t in_flight;
 262         struct completion comp;
 263 };
 264
 265 struct journal_io {
 266         struct dm_integrity_range range;
 267         struct journal_completion *comp;
 268 };
 269
 270 static struct kmem_cache *journal_io_cache;
 271
 272 #define JOURNAL_IO_MEMPOOL      32
 273
 274 #ifdef DEBUG_PRINT
 275 #define DEBUG_print(x, ...)     printk(KERN_DEBUG x, ##__VA_ARGS__)
 276 static void __DEBUG_bytes(__u8 *bytes, size_t len, const char *msg, ...)
 277 {
 278         va_list args;
 279         va_start(args, msg);
 280         vprintk(msg, args);
 281         va_end(args);
 282         if (len)
 283                 pr_cont(":");
 284         while (len) {
 285                 pr_cont(" %02x", *bytes);
 286                 bytes++;
 287                 len--;
 288         }
 289         pr_cont("\n");
 290 }
 291 #define DEBUG_bytes(bytes, len, msg, ...)       __DEBUG_bytes(bytes, len, KERN_DEBUG msg, ##__VA_ARGS__)
 292 #else
 293 #define DEBUG_print(x, ...)                     do { } while (0)
 294 #define DEBUG_bytes(bytes, len, msg, ...)       do { } while (0)
 295 #endif
 296
 297 /*
 298  * DM Integrity profile, protection is performed layer above (dm-crypt)
 299  */
 300 static struct blk_integrity_profile dm_integrity_profile = {
 301         .name                   = "DM-DIF-EXT-TAG",
 302         .generate_fn            = NULL,
 303         .verify_fn              = NULL,
 304 };
 305
 306 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map);
 307 static void integrity_bio_wait(struct work_struct *w);
 308 static void dm_integrity_dtr(struct dm_target *ti);
 309
 310 static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err)
 311 {
 312         if (!cmpxchg(&ic->failed, 0, err))
 313                 DMERR("Error on %s: %d", msg, err);
 314 }
 315
 316 static int dm_integrity_failed(struct dm_integrity_c *ic)
 317 {
 318         return ACCESS_ONCE(ic->failed);
 319 }
 320
 321 static commit_id_t dm_integrity_commit_id(struct dm_integrity_c *ic, unsigned i,
 322                                           unsigned j, unsigned char seq)
 323 {
 324         /*
 325          * Xor the number with section and sector, so that if a piece of
 326          * journal is written at wrong place, it is detected.
 327          */
 328         return ic->commit_ids[seq] ^ cpu_to_le64(((__u64)i << 32) ^ j);
 329 }
 330
 331 static void get_area_and_offset(struct dm_integrity_c *ic, sector_t data_sector,
 332                                 sector_t *area, sector_t *offset)
 333 {
 334         __u8 log2_interleave_sectors = ic->sb->log2_interleave_sectors;
 335
 336         *area = data_sector >> log2_interleave_sectors;
 337         *offset = (unsigned)data_sector & ((1U << log2_interleave_sectors) - 1);
 338 }
 339
 340 #define sector_to_block(ic, n)                                          \
 341 do {                                                                    \
 342         BUG_ON((n) & (unsigned)((ic)->sectors_per_block - 1));          \
 343         (n) >>= (ic)->sb->log2_sectors_per_block;                       \
 344 } while (0)
 345
 346 static __u64 get_metadata_sector_and_offset(struct dm_integrity_c *ic, sector_t area,
 347                                             sector_t offset, unsigned *metadata_offset)
 348 {
 349         __u64 ms;
 350         unsigned mo;
 351
 352         ms = area << ic->sb->log2_interleave_sectors;
 353         if (likely(ic->log2_metadata_run >= 0))
 354                 ms += area << ic->log2_metadata_run;
 355         else
 356                 ms += area * ic->metadata_run;
 357         ms >>= ic->log2_buffer_sectors;
 358
 359         sector_to_block(ic, offset);
 360
 361         if (likely(ic->log2_tag_size >= 0)) {
 362                 ms += offset >> (SECTOR_SHIFT + ic->log2_buffer_sectors - ic->log2_tag_size);
 363                 mo = (offset << ic->log2_tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
 364         } else {
 365                 ms += (__u64)offset * ic->tag_size >> (SECTOR_SHIFT + ic->log2_buffer_sectors);
 366                 mo = (offset * ic->tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
 367         }
 368         *metadata_offset = mo;
 369         return ms;
 370 }
 371
 372 static sector_t get_data_sector(struct dm_integrity_c *ic, sector_t area, sector_t offset)
 373 {
 374         sector_t result;
 375
 376         result = area << ic->sb->log2_interleave_sectors;
 377         if (likely(ic->log2_metadata_run >= 0))
 378                 result += (area + 1) << ic->log2_metadata_run;
 379         else
 380                 result += (area + 1) * ic->metadata_run;
 381
 382         result += (sector_t)ic->initial_sectors + offset;
 383         return result;
 384 }
 385
 386 static void wraparound_section(struct dm_integrity_c *ic, unsigned *sec_ptr)
 387 {
 388         if (unlikely(*sec_ptr >= ic->journal_sections))
 389                 *sec_ptr -= ic->journal_sections;
 390 }
 391
 392 static int sync_rw_sb(struct dm_integrity_c *ic, int op, int op_flags)
 393 {
 394         struct dm_io_request io_req;
 395         struct dm_io_region io_loc;
 396
 397         io_req.bi_op = op;
 398         io_req.bi_op_flags = op_flags;
 399         io_req.mem.type = DM_IO_KMEM;
 400         io_req.mem.ptr.addr = ic->sb;
 401         io_req.notify.fn = NULL;
 402         io_req.client = ic->io;
 403         io_loc.bdev = ic->dev->bdev;
 404         io_loc.sector = ic->start;
 405         io_loc.count = SB_SECTORS;
 406
 407         return dm_io(&io_req, 1, &io_loc, NULL);
 408 }
 409
 410 static void access_journal_check(struct dm_integrity_c *ic, unsigned section, unsigned offset,
 411                                  bool e, const char *function)
 412 {
 413 #if defined(CONFIG_DM_DEBUG) || defined(INTERNAL_VERIFY)
 414         unsigned limit = e ? ic->journal_section_entries : ic->journal_section_sectors;
 415
 416         if (unlikely(section >= ic->journal_sections) ||
 417             unlikely(offset >= limit)) {
 418                 printk(KERN_CRIT "%s: invalid access at (%u,%u), limit (%u,%u)\n",
 419                         function, section, offset, ic->journal_sections, limit);
 420                 BUG();
 421         }
 422 #endif
 423 }
 424
 425 static void page_list_location(struct dm_integrity_c *ic, unsigned section, unsigned offset,
 426                                unsigned *pl_index, unsigned *pl_offset)
 427 {
 428         unsigned sector;
 429
 430         access_journal_check(ic, section, offset, false, "page_list_location");
 431
 432         sector = section * ic->journal_section_sectors + offset;
 433
 434         *pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
 435         *pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
 436 }
 437
 438 static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl,
 439                                                unsigned section, unsigned offset, unsigned *n_sectors)
 440 {
 441         unsigned pl_index, pl_offset;
 442         char *va;
 443
 444         page_list_location(ic, section, offset, &pl_index, &pl_offset);
 445
 446         if (n_sectors)
 447                 *n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT;
 448
 449         va = lowmem_page_address(pl[pl_index].page);
 450
 451         return (struct journal_sector *)(va + pl_offset);
 452 }
 453
 454 static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset)
 455 {
 456         return access_page_list(ic, ic->journal, section, offset, NULL);
 457 }
 458
 459 static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned section, unsigned n)
 460 {
 461         unsigned rel_sector, offset;
 462         struct journal_sector *js;
 463
 464         access_journal_check(ic, section, n, true, "access_journal_entry");
 465
 466         rel_sector = n % JOURNAL_BLOCK_SECTORS;
 467         offset = n / JOURNAL_BLOCK_SECTORS;
 468
 469         js = access_journal(ic, section, rel_sector);
 470         return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size);
 471 }
 472
 473 static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned section, unsigned n)
 474 {
 475         n <<= ic->sb->log2_sectors_per_block;
 476
 477         n += JOURNAL_BLOCK_SECTORS;
 478
 479         access_journal_check(ic, section, n, false, "access_journal_data");
 480
 481         return access_journal(ic, section, n);
 482 }
 483
 484 static void section_mac(struct dm_integrity_c *ic, unsigned section, __u8 result[JOURNAL_MAC_SIZE])
 485 {
 486         SHASH_DESC_ON_STACK(desc, ic->journal_mac);
 487         int r;
 488         unsigned j, size;
 489
 490         desc->tfm = ic->journal_mac;
 491         desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 492
 493         r = crypto_shash_init(desc);
 494         if (unlikely(r)) {
 495                 dm_integrity_io_error(ic, "crypto_shash_init", r);
 496                 goto err;
 497         }
 498
 499         for (j = 0; j < ic->journal_section_entries; j++) {
 500                 struct journal_entry *je = access_journal_entry(ic, section, j);
 501                 r = crypto_shash_update(desc, (__u8 *)&je->u.sector, sizeof je->u.sector);
 502                 if (unlikely(r)) {
 503                         dm_integrity_io_error(ic, "crypto_shash_update", r);
 504                         goto err;
 505                 }
 506         }
 507
 508         size = crypto_shash_digestsize(ic->journal_mac);
 509
 510         if (likely(size <= JOURNAL_MAC_SIZE)) {
 511                 r = crypto_shash_final(desc, result);
 512                 if (unlikely(r)) {
 513                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 514                         goto err;
 515                 }
 516                 memset(result + size, 0, JOURNAL_MAC_SIZE - size);
 517         } else {
 518                 __u8 digest[size];
 519                 r = crypto_shash_final(desc, digest);
 520                 if (unlikely(r)) {
 521                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 522                         goto err;
 523                 }
 524                 memcpy(result, digest, JOURNAL_MAC_SIZE);
 525         }
 526
 527         return;
 528 err:
 529         memset(result, 0, JOURNAL_MAC_SIZE);
 530 }
 531
 532 static void rw_section_mac(struct dm_integrity_c *ic, unsigned section, bool wr)
 533 {
 534         __u8 result[JOURNAL_MAC_SIZE];
 535         unsigned j;
 536
 537         if (!ic->journal_mac)
 538                 return;
 539
 540         section_mac(ic, section, result);
 541
 542         for (j = 0; j < JOURNAL_BLOCK_SECTORS; j++) {
 543                 struct journal_sector *js = access_journal(ic, section, j);
 544
 545                 if (likely(wr))
 546                         memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR);
 547                 else {
 548                         if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR))
 549                                 dm_integrity_io_error(ic, "journal mac", -EILSEQ);
 550                 }
 551         }
 552 }
 553
 554 static void complete_journal_op(void *context)
 555 {
 556         struct journal_completion *comp = context;
 557         BUG_ON(!atomic_read(&comp->in_flight));
 558         if (likely(atomic_dec_and_test(&comp->in_flight)))
 559                 complete(&comp->comp);
 560 }
 561
 562 static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
 563                         unsigned n_sections, struct journal_completion *comp)
 564 {
 565         struct async_submit_ctl submit;
 566         size_t n_bytes = (size_t)(n_sections * ic->journal_section_sectors) << SECTOR_SHIFT;
 567         unsigned pl_index, pl_offset, section_index;
 568         struct page_list *source_pl, *target_pl;
 569
 570         if (likely(encrypt)) {
 571                 source_pl = ic->journal;
 572                 target_pl = ic->journal_io;
 573         } else {
 574                 source_pl = ic->journal_io;
 575                 target_pl = ic->journal;
 576         }
 577
 578         page_list_location(ic, section, 0, &pl_index, &pl_offset);
 579
 580         atomic_add(roundup(pl_offset + n_bytes, PAGE_SIZE) >> PAGE_SHIFT, &comp->in_flight);
 581
 582         init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, complete_journal_op, comp, NULL);
 583
 584         section_index = pl_index;
 585
 586         do {
 587                 size_t this_step;
 588                 struct page *src_pages[2];
 589                 struct page *dst_page;
 590
 591                 while (unlikely(pl_index == section_index)) {
 592                         unsigned dummy;
 593                         if (likely(encrypt))
 594                                 rw_section_mac(ic, section, true);
 595                         section++;
 596                         n_sections--;
 597                         if (!n_sections)
 598                                 break;
 599                         page_list_location(ic, section, 0, &section_index, &dummy);
 600                 }
 601
 602                 this_step = min(n_bytes, (size_t)PAGE_SIZE - pl_offset);
 603                 dst_page = target_pl[pl_index].page;
 604                 src_pages[0] = source_pl[pl_index].page;
 605                 src_pages[1] = ic->journal_xor[pl_index].page;
 606
 607                 async_xor(dst_page, src_pages, pl_offset, 2, this_step, &submit);
 608
 609                 pl_index++;
 610                 pl_offset = 0;
 611                 n_bytes -= this_step;
 612         } while (n_bytes);
 613
 614         BUG_ON(n_sections);
 615
 616         async_tx_issue_pending_all();
 617 }
 618
 619 static void complete_journal_encrypt(struct crypto_async_request *req, int err)
 620 {
 621         struct journal_completion *comp = req->data;
 622         if (unlikely(err)) {
 623                 if (likely(err == -EINPROGRESS)) {
 624                         complete(&comp->ic->crypto_backoff);
 625                         return;
 626                 }
 627                 dm_integrity_io_error(comp->ic, "asynchronous encrypt", err);
 628         }
 629         complete_journal_op(comp);
 630 }
 631
 632 static bool do_crypt(bool encrypt, struct skcipher_request *req, struct journal_completion *comp)
 633 {
 634         int r;
 635         skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
 636                                       complete_journal_encrypt, comp);
 637         if (likely(encrypt))
 638                 r = crypto_skcipher_encrypt(req);
 639         else
 640                 r = crypto_skcipher_decrypt(req);
 641         if (likely(!r))
 642                 return false;
 643         if (likely(r == -EINPROGRESS))
 644                 return true;
 645         if (likely(r == -EBUSY)) {
 646                 wait_for_completion(&comp->ic->crypto_backoff);
 647                 reinit_completion(&comp->ic->crypto_backoff);
 648                 return true;
 649         }
 650         dm_integrity_io_error(comp->ic, "encrypt", r);
 651         return false;
 652 }
 653
 654 static void crypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
 655                           unsigned n_sections, struct journal_completion *comp)
 656 {
 657         struct scatterlist **source_sg;
 658         struct scatterlist **target_sg;
 659
 660         atomic_add(2, &comp->in_flight);
 661
 662         if (likely(encrypt)) {
 663                 source_sg = ic->journal_scatterlist;
 664                 target_sg = ic->journal_io_scatterlist;
 665         } else {
 666                 source_sg = ic->journal_io_scatterlist;
 667                 target_sg = ic->journal_scatterlist;
 668         }
 669
 670         do {
 671                 struct skcipher_request *req;
 672                 unsigned ivsize;
 673                 char *iv;
 674
 675                 if (likely(encrypt))
 676                         rw_section_mac(ic, section, true);
 677
 678                 req = ic->sk_requests[section];
 679                 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
 680                 iv = req->iv;
 681
 682                 memcpy(iv, iv + ivsize, ivsize);
 683
 684                 req->src = source_sg[section];
 685                 req->dst = target_sg[section];
 686
 687                 if (unlikely(do_crypt(encrypt, req, comp)))
 688                         atomic_inc(&comp->in_flight);
 689
 690                 section++;
 691                 n_sections--;
 692         } while (n_sections);
 693
 694         atomic_dec(&comp->in_flight);
 695         complete_journal_op(comp);
 696 }
 697
 698 static void encrypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
 699                             unsigned n_sections, struct journal_completion *comp)
 700 {
 701         if (ic->journal_xor)
 702                 return xor_journal(ic, encrypt, section, n_sections, comp);
 703         else
 704                 return crypt_journal(ic, encrypt, section, n_sections, comp);
 705 }
 706
 707 static void complete_journal_io(unsigned long error, void *context)
 708 {
 709         struct journal_completion *comp = context;
 710         if (unlikely(error != 0))
 711                 dm_integrity_io_error(comp->ic, "writing journal", -EIO);
 712         complete_journal_op(comp);
 713 }
 714
 715 static void rw_journal(struct dm_integrity_c *ic, int op, int op_flags, unsigned section,
 716                        unsigned n_sections, struct journal_completion *comp)
 717 {
 718         struct dm_io_request io_req;
 719         struct dm_io_region io_loc;
 720         unsigned sector, n_sectors, pl_index, pl_offset;
 721         int r;
 722
 723         if (unlikely(dm_integrity_failed(ic))) {
 724                 if (comp)
 725                         complete_journal_io(-1UL, comp);
 726                 return;
 727         }
 728
 729         sector = section * ic->journal_section_sectors;
 730         n_sectors = n_sections * ic->journal_section_sectors;
 731
 732         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
 733         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
 734
 735         io_req.bi_op = op;
 736         io_req.bi_op_flags = op_flags;
 737         io_req.mem.type = DM_IO_PAGE_LIST;
 738         if (ic->journal_io)
 739                 io_req.mem.ptr.pl = &ic->journal_io[pl_index];
 740         else
 741                 io_req.mem.ptr.pl = &ic->journal[pl_index];
 742         io_req.mem.offset = pl_offset;
 743         if (likely(comp != NULL)) {
 744                 io_req.notify.fn = complete_journal_io;
 745                 io_req.notify.context = comp;
 746         } else {
 747                 io_req.notify.fn = NULL;
 748         }
 749         io_req.client = ic->io;
 750         io_loc.bdev = ic->dev->bdev;
 751         io_loc.sector = ic->start + SB_SECTORS + sector;
 752         io_loc.count = n_sectors;
 753
 754         r = dm_io(&io_req, 1, &io_loc, NULL);
 755         if (unlikely(r)) {
 756                 dm_integrity_io_error(ic, op == REQ_OP_READ ? "reading journal" : "writing journal", r);
 757                 if (comp) {
 758                         WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
 759                         complete_journal_io(-1UL, comp);
 760                 }
 761         }
 762 }
 763
 764 static void write_journal(struct dm_integrity_c *ic, unsigned commit_start, unsigned commit_sections)
 765 {
 766         struct journal_completion io_comp;
 767         struct journal_completion crypt_comp_1;
 768         struct journal_completion crypt_comp_2;
 769         unsigned i;
 770
 771         io_comp.ic = ic;
 772         io_comp.comp = COMPLETION_INITIALIZER_ONSTACK(io_comp.comp);
 773
 774         if (commit_start + commit_sections <= ic->journal_sections) {
 775                 io_comp.in_flight = (atomic_t)ATOMIC_INIT(1);
 776                 if (ic->journal_io) {
 777                         crypt_comp_1.ic = ic;
 778                         crypt_comp_1.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_1.comp);
 779                         crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
 780                         encrypt_journal(ic, true, commit_start, commit_sections, &crypt_comp_1);
 781                         wait_for_completion_io(&crypt_comp_1.comp);
 782                 } else {
 783                         for (i = 0; i < commit_sections; i++)
 784                                 rw_section_mac(ic, commit_start + i, true);
 785                 }
 786                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, commit_start,
 787                            commit_sections, &io_comp);
 788         } else {
 789                 unsigned to_end;
 790                 io_comp.in_flight = (atomic_t)ATOMIC_INIT(2);
 791                 to_end = ic->journal_sections - commit_start;
 792                 if (ic->journal_io) {
 793                         crypt_comp_1.ic = ic;
 794                         crypt_comp_1.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_1.comp);
 795                         crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
 796                         encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1);
 797                         if (try_wait_for_completion(&crypt_comp_1.comp)) {
 798                                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
 799                                 crypt_comp_1.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_1.comp);
 800                                 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
 801                                 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1);
 802                                 wait_for_completion_io(&crypt_comp_1.comp);
 803                         } else {
 804                                 crypt_comp_2.ic = ic;
 805                                 crypt_comp_2.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_2.comp);
 806                                 crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0);
 807                                 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2);
 808                                 wait_for_completion_io(&crypt_comp_1.comp);
 809                                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
 810                                 wait_for_completion_io(&crypt_comp_2.comp);
 811                         }
 812                 } else {
 813                         for (i = 0; i < to_end; i++)
 814                                 rw_section_mac(ic, commit_start + i, true);
 815                         rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
 816                         for (i = 0; i < commit_sections - to_end; i++)
 817                                 rw_section_mac(ic, i, true);
 818                 }
 819                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, 0, commit_sections - to_end, &io_comp);
 820         }
 821
 822         wait_for_completion_io(&io_comp.comp);
 823 }
 824
 825 static void copy_from_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset,
 826                               unsigned n_sectors, sector_t target, io_notify_fn fn, void *data)
 827 {
 828         struct dm_io_request io_req;
 829         struct dm_io_region io_loc;
 830         int r;
 831         unsigned sector, pl_index, pl_offset;
 832
 833         BUG_ON((target | n_sectors | offset) & (unsigned)(ic->sectors_per_block - 1));
 834
 835         if (unlikely(dm_integrity_failed(ic))) {
 836                 fn(-1UL, data);
 837                 return;
 838         }
 839
 840         sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset;
 841
 842         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
 843         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
 844
 845         io_req.bi_op = REQ_OP_WRITE;
 846         io_req.bi_op_flags = 0;
 847         io_req.mem.type = DM_IO_PAGE_LIST;
 848         io_req.mem.ptr.pl = &ic->journal[pl_index];
 849         io_req.mem.offset = pl_offset;
 850         io_req.notify.fn = fn;
 851         io_req.notify.context = data;
 852         io_req.client = ic->io;
 853         io_loc.bdev = ic->dev->bdev;
 854         io_loc.sector = ic->start + target;
 855         io_loc.count = n_sectors;
 856
 857         r = dm_io(&io_req, 1, &io_loc, NULL);
 858         if (unlikely(r)) {
 859                 WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
 860                 fn(-1UL, data);
 861         }
 862 }
 863
 864 static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
 865 {
 866         struct rb_node **n = &ic->in_progress.rb_node;
 867         struct rb_node *parent;
 868
 869         BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned)(ic->sectors_per_block - 1));
 870
 871         parent = NULL;
 872
 873         while (*n) {
 874                 struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node);
 875
 876                 parent = *n;
 877                 if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector) {
 878                         n = &range->node.rb_left;
 879                 } else if (new_range->logical_sector >= range->logical_sector + range->n_sectors) {
 880                         n = &range->node.rb_right;
 881                 } else {
 882                         return false;
 883                 }
 884         }
 885
 886         rb_link_node(&new_range->node, parent, n);
 887         rb_insert_color(&new_range->node, &ic->in_progress);
 888
 889         return true;
 890 }
 891
 892 static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range)
 893 {
 894         rb_erase(&range->node, &ic->in_progress);
 895         wake_up_locked(&ic->endio_wait);
 896 }
 897
 898 static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range)
 899 {
 900         unsigned long flags;
 901
 902         spin_lock_irqsave(&ic->endio_wait.lock, flags);
 903         remove_range_unlocked(ic, range);
 904         spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
 905 }
 906
 907 static void init_journal_node(struct journal_node *node)
 908 {
 909         RB_CLEAR_NODE(&node->node);
 910         node->sector = (sector_t)-1;
 911 }
 912
 913 static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector)
 914 {
 915         struct rb_node **link;
 916         struct rb_node *parent;
 917
 918         node->sector = sector;
 919         BUG_ON(!RB_EMPTY_NODE(&node->node));
 920
 921         link = &ic->journal_tree_root.rb_node;
 922         parent = NULL;
 923
 924         while (*link) {
 925                 struct journal_node *j;
 926                 parent = *link;
 927                 j = container_of(parent, struct journal_node, node);
 928                 if (sector < j->sector)
 929                         link = &j->node.rb_left;
 930                 else
 931                         link = &j->node.rb_right;
 932         }
 933
 934         rb_link_node(&node->node, parent, link);
 935         rb_insert_color(&node->node, &ic->journal_tree_root);
 936 }
 937
 938 static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node)
 939 {
 940         BUG_ON(RB_EMPTY_NODE(&node->node));
 941         rb_erase(&node->node, &ic->journal_tree_root);
 942         init_journal_node(node);
 943 }
 944
 945 #define NOT_FOUND       (-1U)
 946
 947 static unsigned find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector)
 948 {
 949         struct rb_node *n = ic->journal_tree_root.rb_node;
 950         unsigned found = NOT_FOUND;
 951         *next_sector = (sector_t)-1;
 952         while (n) {
 953                 struct journal_node *j = container_of(n, struct journal_node, node);
 954                 if (sector == j->sector) {
 955                         found = j - ic->journal_tree;
 956                 }
 957                 if (sector < j->sector) {
 958                         *next_sector = j->sector;
 959                         n = j->node.rb_left;
 960                 } else {
 961                         n = j->node.rb_right;
 962                 }
 963         }
 964
 965         return found;
 966 }
 967
 968 static bool test_journal_node(struct dm_integrity_c *ic, unsigned pos, sector_t sector)
 969 {
 970         struct journal_node *node, *next_node;
 971         struct rb_node *next;
 972
 973         if (unlikely(pos >= ic->journal_entries))
 974                 return false;
 975         node = &ic->journal_tree[pos];
 976         if (unlikely(RB_EMPTY_NODE(&node->node)))
 977                 return false;
 978         if (unlikely(node->sector != sector))
 979                 return false;
 980
 981         next = rb_next(&node->node);
 982         if (unlikely(!next))
 983                 return true;
 984
 985         next_node = container_of(next, struct journal_node, node);
 986         return next_node->sector != sector;
 987 }
 988
 989 static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node)
 990 {
 991         struct rb_node *next;
 992         struct journal_node *next_node;
 993         unsigned next_section;
 994
 995         BUG_ON(RB_EMPTY_NODE(&node->node));
 996
 997         next = rb_next(&node->node);
 998         if (unlikely(!next))
 999                 return false;
1000
1001         next_node = container_of(next, struct journal_node, node);
1002
1003         if (next_node->sector != node->sector)
1004                 return false;
1005
1006         next_section = (unsigned)(next_node - ic->journal_tree) / ic->journal_section_entries;
1007         if (next_section >= ic->committed_section &&
1008             next_section < ic->committed_section + ic->n_committed_sections)
1009                 return true;
1010         if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections)
1011                 return true;
1012
1013         return false;
1014 }
1015
1016 #define TAG_READ        0
1017 #define TAG_WRITE       1
1018 #define TAG_CMP         2
1019
1020 static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block,
1021                                unsigned *metadata_offset, unsigned total_size, int op)
1022 {
1023         do {
1024                 unsigned char *data, *dp;
1025                 struct dm_buffer *b;
1026                 unsigned to_copy;
1027                 int r;
1028
1029                 r = dm_integrity_failed(ic);
1030                 if (unlikely(r))
1031                         return r;
1032
1033                 data = dm_bufio_read(ic->bufio, *metadata_block, &b);
1034                 if (unlikely(IS_ERR(data)))
1035                         return PTR_ERR(data);
1036
1037                 to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size);
1038                 dp = data + *metadata_offset;
1039                 if (op == TAG_READ) {
1040                         memcpy(tag, dp, to_copy);
1041                 } else if (op == TAG_WRITE) {
1042                         memcpy(dp, tag, to_copy);
1043                         dm_bufio_mark_buffer_dirty(b);
1044                 } else  {
1045                         /* e.g.: op == TAG_CMP */
1046                         if (unlikely(memcmp(dp, tag, to_copy))) {
1047                                 unsigned i;
1048
1049                                 for (i = 0; i < to_copy; i++) {
1050                                         if (dp[i] != tag[i])
1051                                                 break;
1052                                         total_size--;
1053                                 }
1054                                 dm_bufio_release(b);
1055                                 return total_size;
1056                         }
1057                 }
1058                 dm_bufio_release(b);
1059
1060                 tag += to_copy;
1061                 *metadata_offset += to_copy;
1062                 if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) {
1063                         (*metadata_block)++;
1064                         *metadata_offset = 0;
1065                 }
1066                 total_size -= to_copy;
1067         } while (unlikely(total_size));
1068
1069         return 0;
1070 }
1071
1072 static void dm_integrity_flush_buffers(struct dm_integrity_c *ic)
1073 {
1074         int r;
1075         r = dm_bufio_write_dirty_buffers(ic->bufio);
1076         if (unlikely(r))
1077                 dm_integrity_io_error(ic, "writing tags", r);
1078 }
1079
1080 static void sleep_on_endio_wait(struct dm_integrity_c *ic)
1081 {
1082         DECLARE_WAITQUEUE(wait, current);
1083         __add_wait_queue(&ic->endio_wait, &wait);
1084         __set_current_state(TASK_UNINTERRUPTIBLE);
1085         spin_unlock_irq(&ic->endio_wait.lock);
1086         io_schedule();
1087         spin_lock_irq(&ic->endio_wait.lock);
1088         __remove_wait_queue(&ic->endio_wait, &wait);
1089 }
1090
1091 static void autocommit_fn(unsigned long data)
1092 {
1093         struct dm_integrity_c *ic = (struct dm_integrity_c *)data;
1094
1095         if (likely(!dm_integrity_failed(ic)))
1096                 queue_work(ic->commit_wq, &ic->commit_work);
1097 }
1098
1099 static void schedule_autocommit(struct dm_integrity_c *ic)
1100 {
1101         if (!timer_pending(&ic->autocommit_timer))
1102                 mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies);
1103 }
1104
1105 static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1106 {
1107         struct bio *bio;
1108         unsigned long flags;
1109
1110         spin_lock_irqsave(&ic->endio_wait.lock, flags);
1111         bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1112         bio_list_add(&ic->flush_bio_list, bio);
1113         spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1114
1115         queue_work(ic->commit_wq, &ic->commit_work);
1116 }
1117
1118 static void do_endio(struct dm_integrity_c *ic, struct bio *bio)
1119 {
1120         int r = dm_integrity_failed(ic);
1121         if (unlikely(r) && !bio->bi_status)
1122                 bio->bi_status = errno_to_blk_status(r);
1123         bio_endio(bio);
1124 }
1125
1126 static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1127 {
1128         struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1129
1130         if (unlikely(dio->fua) && likely(!bio->bi_status) && likely(!dm_integrity_failed(ic)))
1131                 submit_flush_bio(ic, dio);
1132         else
1133                 do_endio(ic, bio);
1134 }
1135
1136 static void dec_in_flight(struct dm_integrity_io *dio)
1137 {
1138         if (atomic_dec_and_test(&dio->in_flight)) {
1139                 struct dm_integrity_c *ic = dio->ic;
1140                 struct bio *bio;
1141
1142                 remove_range(ic, &dio->range);
1143
1144                 if (unlikely(dio->write))
1145                         schedule_autocommit(ic);
1146
1147                 bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1148
1149                 if (unlikely(dio->bi_status) && !bio->bi_status)
1150                         bio->bi_status = dio->bi_status;
1151                 if (likely(!bio->bi_status) && unlikely(bio_sectors(bio) != dio->range.n_sectors)) {
1152                         dio->range.logical_sector += dio->range.n_sectors;
1153                         bio_advance(bio, dio->range.n_sectors << SECTOR_SHIFT);
1154                         INIT_WORK(&dio->work, integrity_bio_wait);
1155                         queue_work(ic->wait_wq, &dio->work);
1156                         return;
1157                 }
1158                 do_endio_flush(ic, dio);
1159         }
1160 }
1161
1162 static void integrity_end_io(struct bio *bio)
1163 {
1164         struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1165
1166         bio->bi_iter = dio->orig_bi_iter;
1167         bio->bi_bdev = dio->orig_bi_bdev;
1168         if (dio->orig_bi_integrity) {
1169                 bio->bi_integrity = dio->orig_bi_integrity;
1170                 bio->bi_opf |= REQ_INTEGRITY;
1171         }
1172         bio->bi_end_io = dio->orig_bi_end_io;
1173
1174         if (dio->completion)
1175                 complete(dio->completion);
1176
1177         dec_in_flight(dio);
1178 }
1179
1180 static void integrity_sector_checksum(struct dm_integrity_c *ic, sector_t sector,
1181                                       const char *data, char *result)
1182 {
1183         __u64 sector_le = cpu_to_le64(sector);
1184         SHASH_DESC_ON_STACK(req, ic->internal_hash);
1185         int r;
1186         unsigned digest_size;
1187
1188         req->tfm = ic->internal_hash;
1189         req->flags = 0;
1190
1191         r = crypto_shash_init(req);
1192         if (unlikely(r < 0)) {
1193                 dm_integrity_io_error(ic, "crypto_shash_init", r);
1194                 goto failed;
1195         }
1196
1197         r = crypto_shash_update(req, (const __u8 *)&sector_le, sizeof sector_le);
1198         if (unlikely(r < 0)) {
1199                 dm_integrity_io_error(ic, "crypto_shash_update", r);
1200                 goto failed;
1201         }
1202
1203         r = crypto_shash_update(req, data, ic->sectors_per_block << SECTOR_SHIFT);
1204         if (unlikely(r < 0)) {
1205                 dm_integrity_io_error(ic, "crypto_shash_update", r);
1206                 goto failed;
1207         }
1208
1209         r = crypto_shash_final(req, result);
1210         if (unlikely(r < 0)) {
1211                 dm_integrity_io_error(ic, "crypto_shash_final", r);
1212                 goto failed;
1213         }
1214
1215         digest_size = crypto_shash_digestsize(ic->internal_hash);
1216         if (unlikely(digest_size < ic->tag_size))
1217                 memset(result + digest_size, 0, ic->tag_size - digest_size);
1218
1219         return;
1220
1221 failed:
1222         /* this shouldn't happen anyway, the hash functions have no reason to fail */
1223         get_random_bytes(result, ic->tag_size);
1224 }
1225
1226 static void integrity_metadata(struct work_struct *w)
1227 {
1228         struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
1229         struct dm_integrity_c *ic = dio->ic;
1230
1231         int r;
1232
1233         if (ic->internal_hash) {
1234                 struct bvec_iter iter;
1235                 struct bio_vec bv;
1236                 unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1237                 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1238                 char *checksums;
1239                 unsigned extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0;
1240                 char checksums_onstack[ic->tag_size + extra_space];
1241                 unsigned sectors_to_process = dio->range.n_sectors;
1242                 sector_t sector = dio->range.logical_sector;
1243
1244                 if (unlikely(ic->mode == 'R'))
1245                         goto skip_io;
1246
1247                 checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT >> ic->sb->log2_sectors_per_block) * ic->tag_size + extra_space,
1248                                     GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
1249                 if (!checksums)
1250                         checksums = checksums_onstack;
1251
1252                 __bio_for_each_segment(bv, bio, iter, dio->orig_bi_iter) {
1253                         unsigned pos;
1254                         char *mem, *checksums_ptr;
1255
1256 again:
1257                         mem = (char *)kmap_atomic(bv.bv_page) + bv.bv_offset;
1258                         pos = 0;
1259                         checksums_ptr = checksums;
1260                         do {
1261                                 integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr);
1262                                 checksums_ptr += ic->tag_size;
1263                                 sectors_to_process -= ic->sectors_per_block;
1264                                 pos += ic->sectors_per_block << SECTOR_SHIFT;
1265                                 sector += ic->sectors_per_block;
1266                         } while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
1267                         kunmap_atomic(mem);
1268
1269                         r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1270                                                 checksums_ptr - checksums, !dio->write ? TAG_CMP : TAG_WRITE);
1271                         if (unlikely(r)) {
1272                                 if (r > 0) {
1273                                         DMERR("Checksum failed at sector 0x%llx",
1274                                               (unsigned long long)(sector - ((r + ic->tag_size - 1) / ic->tag_size)));
1275                                         r = -EILSEQ;
1276                                 }
1277                                 if (likely(checksums != checksums_onstack))
1278                                         kfree(checksums);
1279                                 goto error;
1280                         }
1281
1282                         if (!sectors_to_process)
1283                                 break;
1284
1285                         if (unlikely(pos < bv.bv_len)) {
1286                                 bv.bv_offset += pos;
1287                                 bv.bv_len -= pos;
1288                                 goto again;
1289                         }
1290                 }
1291
1292                 if (likely(checksums != checksums_onstack))
1293                         kfree(checksums);
1294         } else {
1295                 struct bio_integrity_payload *bip = dio->orig_bi_integrity;
1296
1297                 if (bip) {
1298                         struct bio_vec biv;
1299                         struct bvec_iter iter;
1300                         unsigned data_to_process = dio->range.n_sectors;
1301                         sector_to_block(ic, data_to_process);
1302                         data_to_process *= ic->tag_size;
1303
1304                         bip_for_each_vec(biv, bip, iter) {
1305                                 unsigned char *tag;
1306                                 unsigned this_len;
1307
1308                                 BUG_ON(PageHighMem(biv.bv_page));
1309                                 tag = lowmem_page_address(biv.bv_page) + biv.bv_offset;
1310                                 this_len = min(biv.bv_len, data_to_process);
1311                                 r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset,
1312                                                         this_len, !dio->write ? TAG_READ : TAG_WRITE);
1313                                 if (unlikely(r))
1314                                         goto error;
1315                                 data_to_process -= this_len;
1316                                 if (!data_to_process)
1317                                         break;
1318                         }
1319                 }
1320         }
1321 skip_io:
1322         dec_in_flight(dio);
1323         return;
1324 error:
1325         dio->bi_status = errno_to_blk_status(r);
1326         dec_in_flight(dio);
1327 }
1328
1329 static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
1330 {
1331         struct dm_integrity_c *ic = ti->private;
1332         struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1333         struct bio_integrity_payload *bip;
1334
1335         sector_t area, offset;
1336
1337         dio->ic = ic;
1338         dio->bi_status = 0;
1339
1340         if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
1341                 submit_flush_bio(ic, dio);
1342                 return DM_MAPIO_SUBMITTED;
1343         }
1344
1345         dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector);
1346         dio->write = bio_op(bio) == REQ_OP_WRITE;
1347         dio->fua = dio->write && bio->bi_opf & REQ_FUA;
1348         if (unlikely(dio->fua)) {
1349                 /*
1350                  * Don't pass down the FUA flag because we have to flush
1351                  * disk cache anyway.
1352                  */
1353                 bio->bi_opf &= ~REQ_FUA;
1354         }
1355         if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) {
1356                 DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx",
1357                       (unsigned long long)dio->range.logical_sector, bio_sectors(bio),
1358                       (unsigned long long)ic->provided_data_sectors);
1359                 return DM_MAPIO_KILL;
1360         }
1361         if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned)(ic->sectors_per_block - 1))) {
1362                 DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x",
1363                       ic->sectors_per_block,
1364                       (unsigned long long)dio->range.logical_sector, bio_sectors(bio));
1365                 return DM_MAPIO_KILL;
1366         }
1367
1368         if (ic->sectors_per_block > 1) {
1369                 struct bvec_iter iter;
1370                 struct bio_vec bv;
1371                 bio_for_each_segment(bv, bio, iter) {
1372                         if (unlikely((bv.bv_offset | bv.bv_len) & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
1373                                 DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
1374                                         bv.bv_offset, bv.bv_len, ic->sectors_per_block);
1375                                 return DM_MAPIO_KILL;
1376                         }
1377                 }
1378         }
1379
1380         bip = bio_integrity(bio);
1381         if (!ic->internal_hash) {
1382                 if (bip) {
1383                         unsigned wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block;
1384                         if (ic->log2_tag_size >= 0)
1385                                 wanted_tag_size <<= ic->log2_tag_size;
1386                         else
1387                                 wanted_tag_size *= ic->tag_size;
1388                         if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) {
1389                                 DMERR("Invalid integrity data size %u, expected %u", bip->bip_iter.bi_size, wanted_tag_size);
1390                                 return DM_MAPIO_KILL;
1391                         }
1392                 }
1393         } else {
1394                 if (unlikely(bip != NULL)) {
1395                         DMERR("Unexpected integrity data when using internal hash");
1396                         return DM_MAPIO_KILL;
1397                 }
1398         }
1399
1400         if (unlikely(ic->mode == 'R') && unlikely(dio->write))
1401                 return DM_MAPIO_KILL;
1402
1403         get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1404         dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1405         bio->bi_iter.bi_sector = get_data_sector(ic, area, offset);
1406
1407         dm_integrity_map_continue(dio, true);
1408         return DM_MAPIO_SUBMITTED;
1409 }
1410
1411 static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
1412                                  unsigned journal_section, unsigned journal_entry)
1413 {
1414         struct dm_integrity_c *ic = dio->ic;
1415         sector_t logical_sector;
1416         unsigned n_sectors;
1417
1418         logical_sector = dio->range.logical_sector;
1419         n_sectors = dio->range.n_sectors;
1420         do {
1421                 struct bio_vec bv = bio_iovec(bio);
1422                 char *mem;
1423
1424                 if (unlikely(bv.bv_len >> SECTOR_SHIFT > n_sectors))
1425                         bv.bv_len = n_sectors << SECTOR_SHIFT;
1426                 n_sectors -= bv.bv_len >> SECTOR_SHIFT;
1427                 bio_advance_iter(bio, &bio->bi_iter, bv.bv_len);
1428 retry_kmap:
1429                 mem = kmap_atomic(bv.bv_page);
1430                 if (likely(dio->write))
1431                         flush_dcache_page(bv.bv_page);
1432
1433                 do {
1434                         struct journal_entry *je = access_journal_entry(ic, journal_section, journal_entry);
1435
1436                         if (unlikely(!dio->write)) {
1437                                 struct journal_sector *js;
1438                                 char *mem_ptr;
1439                                 unsigned s;
1440
1441                                 if (unlikely(journal_entry_is_inprogress(je))) {
1442                                         flush_dcache_page(bv.bv_page);
1443                                         kunmap_atomic(mem);
1444
1445                                         __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
1446                                         goto retry_kmap;
1447                                 }
1448                                 smp_rmb();
1449                                 BUG_ON(journal_entry_get_sector(je) != logical_sector);
1450                                 js = access_journal_data(ic, journal_section, journal_entry);
1451                                 mem_ptr = mem + bv.bv_offset;
1452                                 s = 0;
1453                                 do {
1454                                         memcpy(mem_ptr, js, JOURNAL_SECTOR_DATA);
1455                                         *(commit_id_t *)(mem_ptr + JOURNAL_SECTOR_DATA) = je->last_bytes[s];
1456                                         js++;
1457                                         mem_ptr += 1 << SECTOR_SHIFT;
1458                                 } while (++s < ic->sectors_per_block);
1459 #ifdef INTERNAL_VERIFY
1460                                 if (ic->internal_hash) {
1461                                         char checksums_onstack[max(crypto_shash_digestsize(ic->internal_hash), ic->tag_size)];
1462
1463                                         integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack);
1464                                         if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) {
1465                                                 DMERR("Checksum failed when reading from journal, at sector 0x%llx",
1466                                                       (unsigned long long)logical_sector);
1467                                         }
1468                                 }
1469 #endif
1470                         }
1471
1472                         if (!ic->internal_hash) {
1473                                 struct bio_integrity_payload *bip = bio_integrity(bio);
1474                                 unsigned tag_todo = ic->tag_size;
1475                                 char *tag_ptr = journal_entry_tag(ic, je);
1476
1477                                 if (bip) do {
1478                                         struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
1479                                         unsigned tag_now = min(biv.bv_len, tag_todo);
1480                                         char *tag_addr;
1481                                         BUG_ON(PageHighMem(biv.bv_page));
1482                                         tag_addr = lowmem_page_address(biv.bv_page) + biv.bv_offset;
1483                                         if (likely(dio->write))
1484                                                 memcpy(tag_ptr, tag_addr, tag_now);
1485                                         else
1486                                                 memcpy(tag_addr, tag_ptr, tag_now);
1487                                         bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now);
1488                                         tag_ptr += tag_now;
1489                                         tag_todo -= tag_now;
1490                                 } while (unlikely(tag_todo)); else {
1491                                         if (likely(dio->write))
1492                                                 memset(tag_ptr, 0, tag_todo);
1493                                 }
1494                         }
1495
1496                         if (likely(dio->write)) {
1497                                 struct journal_sector *js;
1498                                 unsigned s;
1499
1500                                 js = access_journal_data(ic, journal_section, journal_entry);
1501                                 memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT);
1502
1503                                 s = 0;
1504                                 do {
1505                                         je->last_bytes[s] = js[s].commit_id;
1506                                 } while (++s < ic->sectors_per_block);
1507
1508                                 if (ic->internal_hash) {
1509                                         unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1510                                         if (unlikely(digest_size > ic->tag_size)) {
1511                                                 char checksums_onstack[digest_size];
1512                                                 integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack);
1513                                                 memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size);
1514                                         } else
1515                                                 integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je));
1516                                 }
1517
1518                                 journal_entry_set_sector(je, logical_sector);
1519                         }
1520                         logical_sector += ic->sectors_per_block;
1521
1522                         journal_entry++;
1523                         if (unlikely(journal_entry == ic->journal_section_entries)) {
1524                                 journal_entry = 0;
1525                                 journal_section++;
1526                                 wraparound_section(ic, &journal_section);
1527                         }
1528
1529                         bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT;
1530                 } while (bv.bv_len -= ic->sectors_per_block << SECTOR_SHIFT);
1531
1532                 if (unlikely(!dio->write))
1533                         flush_dcache_page(bv.bv_page);
1534                 kunmap_atomic(mem);
1535         } while (n_sectors);
1536
1537         if (likely(dio->write)) {
1538                 smp_mb();
1539                 if (unlikely(waitqueue_active(&ic->copy_to_journal_wait)))
1540                         wake_up(&ic->copy_to_journal_wait);
1541                 if (ACCESS_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) {
1542                         queue_work(ic->commit_wq, &ic->commit_work);
1543                 } else {
1544                         schedule_autocommit(ic);
1545                 }
1546         } else {
1547                 remove_range(ic, &dio->range);
1548         }
1549
1550         if (unlikely(bio->bi_iter.bi_size)) {
1551                 sector_t area, offset;
1552
1553                 dio->range.logical_sector = logical_sector;
1554                 get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1555                 dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1556                 return true;
1557         }
1558
1559         return false;
1560 }
1561
1562 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map)
1563 {
1564         struct dm_integrity_c *ic = dio->ic;
1565         struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1566         unsigned journal_section, journal_entry;
1567         unsigned journal_read_pos;
1568         struct completion read_comp;
1569         bool need_sync_io = ic->internal_hash && !dio->write;
1570
1571         if (need_sync_io && from_map) {
1572                 INIT_WORK(&dio->work, integrity_bio_wait);
1573                 queue_work(ic->metadata_wq, &dio->work);
1574                 return;
1575         }
1576
1577 lock_retry:
1578         spin_lock_irq(&ic->endio_wait.lock);
1579 retry:
1580         if (unlikely(dm_integrity_failed(ic))) {
1581                 spin_unlock_irq(&ic->endio_wait.lock);
1582                 do_endio(ic, bio);
1583                 return;
1584         }
1585         dio->range.n_sectors = bio_sectors(bio);
1586         journal_read_pos = NOT_FOUND;
1587         if (likely(ic->mode == 'J')) {
1588                 if (dio->write) {
1589                         unsigned next_entry, i, pos;
1590                         unsigned ws, we;
1591
1592                         dio->range.n_sectors = min(dio->range.n_sectors, ic->free_sectors);
1593                         if (unlikely(!dio->range.n_sectors))
1594                                 goto sleep;
1595                         ic->free_sectors -= dio->range.n_sectors;
1596                         journal_section = ic->free_section;
1597                         journal_entry = ic->free_section_entry;
1598
1599                         next_entry = ic->free_section_entry + dio->range.n_sectors;
1600                         ic->free_section_entry = next_entry % ic->journal_section_entries;
1601                         ic->free_section += next_entry / ic->journal_section_entries;
1602                         ic->n_uncommitted_sections += next_entry / ic->journal_section_entries;
1603                         wraparound_section(ic, &ic->free_section);
1604
1605                         pos = journal_section * ic->journal_section_entries + journal_entry;
1606                         ws = journal_section;
1607                         we = journal_entry;
1608                         i = 0;
1609                         do {
1610                                 struct journal_entry *je;
1611
1612                                 add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i);
1613                                 pos++;
1614                                 if (unlikely(pos >= ic->journal_entries))
1615                                         pos = 0;
1616
1617                                 je = access_journal_entry(ic, ws, we);
1618                                 BUG_ON(!journal_entry_is_unused(je));
1619                                 journal_entry_set_inprogress(je);
1620                                 we++;
1621                                 if (unlikely(we == ic->journal_section_entries)) {
1622                                         we = 0;
1623                                         ws++;
1624                                         wraparound_section(ic, &ws);
1625                                 }
1626                         } while ((i += ic->sectors_per_block) < dio->range.n_sectors);
1627
1628                         spin_unlock_irq(&ic->endio_wait.lock);
1629                         goto journal_read_write;
1630                 } else {
1631                         sector_t next_sector;
1632                         journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
1633                         if (likely(journal_read_pos == NOT_FOUND)) {
1634                                 if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector))
1635                                         dio->range.n_sectors = next_sector - dio->range.logical_sector;
1636                         } else {
1637                                 unsigned i;
1638                                 unsigned jp = journal_read_pos + 1;
1639                                 for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) {
1640                                         if (!test_journal_node(ic, jp, dio->range.logical_sector + i))
1641                                                 break;
1642                                 }
1643                                 dio->range.n_sectors = i;
1644                         }
1645                 }
1646         }
1647         if (unlikely(!add_new_range(ic, &dio->range))) {
1648                 /*
1649                  * We must not sleep in the request routine because it could
1650                  * stall bios on current->bio_list.
1651                  * So, we offload the bio to a workqueue if we have to sleep.
1652                  */
1653 sleep:
1654                 if (from_map) {
1655                         spin_unlock_irq(&ic->endio_wait.lock);
1656                         INIT_WORK(&dio->work, integrity_bio_wait);
1657                         queue_work(ic->wait_wq, &dio->work);
1658                         return;
1659                 } else {
1660                         sleep_on_endio_wait(ic);
1661                         goto retry;
1662                 }
1663         }
1664         spin_unlock_irq(&ic->endio_wait.lock);
1665
1666         if (unlikely(journal_read_pos != NOT_FOUND)) {
1667                 journal_section = journal_read_pos / ic->journal_section_entries;
1668                 journal_entry = journal_read_pos % ic->journal_section_entries;
1669                 goto journal_read_write;
1670         }
1671
1672         dio->in_flight = (atomic_t)ATOMIC_INIT(2);
1673
1674         if (need_sync_io) {
1675                 read_comp = COMPLETION_INITIALIZER_ONSTACK(read_comp);
1676                 dio->completion = &read_comp;
1677         } else
1678                 dio->completion = NULL;
1679
1680         dio->orig_bi_iter = bio->bi_iter;
1681
1682         dio->orig_bi_bdev = bio->bi_bdev;
1683         bio->bi_bdev = ic->dev->bdev;
1684
1685         dio->orig_bi_integrity = bio_integrity(bio);
1686         bio->bi_integrity = NULL;
1687         bio->bi_opf &= ~REQ_INTEGRITY;
1688
1689         dio->orig_bi_end_io = bio->bi_end_io;
1690         bio->bi_end_io = integrity_end_io;
1691
1692         bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT;
1693         bio->bi_iter.bi_sector += ic->start;
1694         generic_make_request(bio);
1695
1696         if (need_sync_io) {
1697                 wait_for_completion_io(&read_comp);
1698                 integrity_metadata(&dio->work);
1699         } else {
1700                 INIT_WORK(&dio->work, integrity_metadata);
1701                 queue_work(ic->metadata_wq, &dio->work);
1702         }
1703
1704         return;
1705
1706 journal_read_write:
1707         if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry)))
1708                 goto lock_retry;
1709
1710         do_endio_flush(ic, dio);
1711 }
1712
1713
1714 static void integrity_bio_wait(struct work_struct *w)
1715 {
1716         struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
1717
1718         dm_integrity_map_continue(dio, false);
1719 }
1720
1721 static void pad_uncommitted(struct dm_integrity_c *ic)
1722 {
1723         if (ic->free_section_entry) {
1724                 ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry;
1725                 ic->free_section_entry = 0;
1726                 ic->free_section++;
1727                 wraparound_section(ic, &ic->free_section);
1728                 ic->n_uncommitted_sections++;
1729         }
1730 }
1731
1732 static void integrity_commit(struct work_struct *w)
1733 {
1734         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work);
1735         unsigned commit_start, commit_sections;
1736         unsigned i, j, n;
1737         struct bio *flushes;
1738
1739         del_timer(&ic->autocommit_timer);
1740
1741         spin_lock_irq(&ic->endio_wait.lock);
1742         flushes = bio_list_get(&ic->flush_bio_list);
1743         if (unlikely(ic->mode != 'J')) {
1744                 spin_unlock_irq(&ic->endio_wait.lock);
1745                 dm_integrity_flush_buffers(ic);
1746                 goto release_flush_bios;
1747         }
1748
1749         pad_uncommitted(ic);
1750         commit_start = ic->uncommitted_section;
1751         commit_sections = ic->n_uncommitted_sections;
1752         spin_unlock_irq(&ic->endio_wait.lock);
1753
1754         if (!commit_sections)
1755                 goto release_flush_bios;
1756
1757         i = commit_start;
1758         for (n = 0; n < commit_sections; n++) {
1759                 for (j = 0; j < ic->journal_section_entries; j++) {
1760                         struct journal_entry *je;
1761                         je = access_journal_entry(ic, i, j);
1762                         io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
1763                 }
1764                 for (j = 0; j < ic->journal_section_sectors; j++) {
1765                         struct journal_sector *js;
1766                         js = access_journal(ic, i, j);
1767                         js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq);
1768                 }
1769                 i++;
1770                 if (unlikely(i >= ic->journal_sections))
1771                         ic->commit_seq = next_commit_seq(ic->commit_seq);
1772                 wraparound_section(ic, &i);
1773         }
1774         smp_rmb();
1775
1776         write_journal(ic, commit_start, commit_sections);
1777
1778         spin_lock_irq(&ic->endio_wait.lock);
1779         ic->uncommitted_section += commit_sections;
1780         wraparound_section(ic, &ic->uncommitted_section);
1781         ic->n_uncommitted_sections -= commit_sections;
1782         ic->n_committed_sections += commit_sections;
1783         spin_unlock_irq(&ic->endio_wait.lock);
1784
1785         if (ACCESS_ONCE(ic->free_sectors) <= ic->free_sectors_threshold)
1786                 queue_work(ic->writer_wq, &ic->writer_work);
1787
1788 release_flush_bios:
1789         while (flushes) {
1790                 struct bio *next = flushes->bi_next;
1791                 flushes->bi_next = NULL;
1792                 do_endio(ic, flushes);
1793                 flushes = next;
1794         }
1795 }
1796
1797 static void complete_copy_from_journal(unsigned long error, void *context)
1798 {
1799         struct journal_io *io = context;
1800         struct journal_completion *comp = io->comp;
1801         struct dm_integrity_c *ic = comp->ic;
1802         remove_range(ic, &io->range);
1803         mempool_free(io, ic->journal_io_mempool);
1804         if (unlikely(error != 0))
1805                 dm_integrity_io_error(ic, "copying from journal", -EIO);
1806         complete_journal_op(comp);
1807 }
1808
1809 static void restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js,
1810                                struct journal_entry *je)
1811 {
1812         unsigned s = 0;
1813         do {
1814                 js->commit_id = je->last_bytes[s];
1815                 js++;
1816         } while (++s < ic->sectors_per_block);
1817 }
1818
1819 static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start,
1820                              unsigned write_sections, bool from_replay)
1821 {
1822         unsigned i, j, n;
1823         struct journal_completion comp;
1824
1825         comp.ic = ic;
1826         comp.in_flight = (atomic_t)ATOMIC_INIT(1);
1827         comp.comp = COMPLETION_INITIALIZER_ONSTACK(comp.comp);
1828
1829         i = write_start;
1830         for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) {
1831 #ifndef INTERNAL_VERIFY
1832                 if (unlikely(from_replay))
1833 #endif
1834                         rw_section_mac(ic, i, false);
1835                 for (j = 0; j < ic->journal_section_entries; j++) {
1836                         struct journal_entry *je = access_journal_entry(ic, i, j);
1837                         sector_t sec, area, offset;
1838                         unsigned k, l, next_loop;
1839                         sector_t metadata_block;
1840                         unsigned metadata_offset;
1841                         struct journal_io *io;
1842
1843                         if (journal_entry_is_unused(je))
1844                                 continue;
1845                         BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay);
1846                         sec = journal_entry_get_sector(je);
1847                         if (unlikely(from_replay)) {
1848                                 if (unlikely(sec & (unsigned)(ic->sectors_per_block - 1))) {
1849                                         dm_integrity_io_error(ic, "invalid sector in journal", -EIO);
1850                                         sec &= ~(sector_t)(ic->sectors_per_block - 1);
1851                                 }
1852                         }
1853                         get_area_and_offset(ic, sec, &area, &offset);
1854                         restore_last_bytes(ic, access_journal_data(ic, i, j), je);
1855                         for (k = j + 1; k < ic->journal_section_entries; k++) {
1856                                 struct journal_entry *je2 = access_journal_entry(ic, i, k);
1857                                 sector_t sec2, area2, offset2;
1858                                 if (journal_entry_is_unused(je2))
1859                                         break;
1860                                 BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay);
1861                                 sec2 = journal_entry_get_sector(je2);
1862                                 get_area_and_offset(ic, sec2, &area2, &offset2);
1863                                 if (area2 != area || offset2 != offset + ((k - j) << ic->sb->log2_sectors_per_block))
1864                                         break;
1865                                 restore_last_bytes(ic, access_journal_data(ic, i, k), je2);
1866                         }
1867                         next_loop = k - 1;
1868
1869                         io = mempool_alloc(ic->journal_io_mempool, GFP_NOIO);
1870                         io->comp = &comp;
1871                         io->range.logical_sector = sec;
1872                         io->range.n_sectors = (k - j) << ic->sb->log2_sectors_per_block;
1873
1874                         spin_lock_irq(&ic->endio_wait.lock);
1875                         while (unlikely(!add_new_range(ic, &io->range)))
1876                                 sleep_on_endio_wait(ic);
1877
1878                         if (likely(!from_replay)) {
1879                                 struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries];
1880
1881                                 /* don't write if there is newer committed sector */
1882                                 while (j < k && find_newer_committed_node(ic, &section_node[j])) {
1883                                         struct journal_entry *je2 = access_journal_entry(ic, i, j);
1884
1885                                         journal_entry_set_unused(je2);
1886                                         remove_journal_node(ic, &section_node[j]);
1887                                         j++;
1888                                         sec += ic->sectors_per_block;
1889                                         offset += ic->sectors_per_block;
1890                                 }
1891                                 while (j < k && find_newer_committed_node(ic, &section_node[k - 1])) {
1892                                         struct journal_entry *je2 = access_journal_entry(ic, i, k - 1);
1893
1894                                         journal_entry_set_unused(je2);
1895                                         remove_journal_node(ic, &section_node[k - 1]);
1896                                         k--;
1897                                 }
1898                                 if (j == k) {
1899                                         remove_range_unlocked(ic, &io->range);
1900                                         spin_unlock_irq(&ic->endio_wait.lock);
1901                                         mempool_free(io, ic->journal_io_mempool);
1902                                         goto skip_io;
1903                                 }
1904                                 for (l = j; l < k; l++) {
1905                                         remove_journal_node(ic, &section_node[l]);
1906                                 }
1907                         }
1908                         spin_unlock_irq(&ic->endio_wait.lock);
1909
1910                         metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
1911                         for (l = j; l < k; l++) {
1912                                 int r;
1913                                 struct journal_entry *je2 = access_journal_entry(ic, i, l);
1914
1915                                 if (
1916 #ifndef INTERNAL_VERIFY
1917                                     unlikely(from_replay) &&
1918 #endif
1919                                     ic->internal_hash) {
1920                                         char test_tag[max(crypto_shash_digestsize(ic->internal_hash), ic->tag_size)];
1921
1922                                         integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block),
1923                                                                   (char *)access_journal_data(ic, i, l), test_tag);
1924                                         if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size)))
1925                                                 dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ);
1926                                 }
1927
1928                                 journal_entry_set_unused(je2);
1929                                 r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset,
1930                                                         ic->tag_size, TAG_WRITE);
1931                                 if (unlikely(r)) {
1932                                         dm_integrity_io_error(ic, "reading tags", r);
1933                                 }
1934                         }
1935
1936                         atomic_inc(&comp.in_flight);
1937                         copy_from_journal(ic, i, j << ic->sb->log2_sectors_per_block,
1938                                           (k - j) << ic->sb->log2_sectors_per_block,
1939                                           get_data_sector(ic, area, offset),
1940                                           complete_copy_from_journal, io);
1941 skip_io:
1942                         j = next_loop;
1943                 }
1944         }
1945
1946         dm_bufio_write_dirty_buffers_async(ic->bufio);
1947
1948         complete_journal_op(&comp);
1949         wait_for_completion_io(&comp.comp);
1950
1951         dm_integrity_flush_buffers(ic);
1952 }
1953
1954 static void integrity_writer(struct work_struct *w)
1955 {
1956         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work);
1957         unsigned write_start, write_sections;
1958
1959         unsigned prev_free_sectors;
1960
1961         /* the following test is not needed, but it tests the replay code */
1962         if (ACCESS_ONCE(ic->suspending))
1963                 return;
1964
1965         spin_lock_irq(&ic->endio_wait.lock);
1966         write_start = ic->committed_section;
1967         write_sections = ic->n_committed_sections;
1968         spin_unlock_irq(&ic->endio_wait.lock);
1969
1970         if (!write_sections)
1971                 return;
1972
1973         do_journal_write(ic, write_start, write_sections, false);
1974
1975         spin_lock_irq(&ic->endio_wait.lock);
1976
1977         ic->committed_section += write_sections;
1978         wraparound_section(ic, &ic->committed_section);
1979         ic->n_committed_sections -= write_sections;
1980
1981         prev_free_sectors = ic->free_sectors;
1982         ic->free_sectors += write_sections * ic->journal_section_entries;
1983         if (unlikely(!prev_free_sectors))
1984                 wake_up_locked(&ic->endio_wait);
1985
1986         spin_unlock_irq(&ic->endio_wait.lock);
1987 }
1988
1989 static void init_journal(struct dm_integrity_c *ic, unsigned start_section,
1990                          unsigned n_sections, unsigned char commit_seq)
1991 {
1992         unsigned i, j, n;
1993
1994         if (!n_sections)
1995                 return;
1996
1997         for (n = 0; n < n_sections; n++) {
1998                 i = start_section + n;
1999                 wraparound_section(ic, &i);
2000                 for (j = 0; j < ic->journal_section_sectors; j++) {
2001                         struct journal_sector *js = access_journal(ic, i, j);
2002                         memset(&js->entries, 0, JOURNAL_SECTOR_DATA);
2003                         js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq);
2004                 }
2005                 for (j = 0; j < ic->journal_section_entries; j++) {
2006                         struct journal_entry *je = access_journal_entry(ic, i, j);
2007                         journal_entry_set_unused(je);
2008                 }
2009         }
2010
2011         write_journal(ic, start_section, n_sections);
2012 }
2013
2014 static int find_commit_seq(struct dm_integrity_c *ic, unsigned i, unsigned j, commit_id_t id)
2015 {
2016         unsigned char k;
2017         for (k = 0; k < N_COMMIT_IDS; k++) {
2018                 if (dm_integrity_commit_id(ic, i, j, k) == id)
2019                         return k;
2020         }
2021         dm_integrity_io_error(ic, "journal commit id", -EIO);
2022         return -EIO;
2023 }
2024
2025 static void replay_journal(struct dm_integrity_c *ic)
2026 {
2027         unsigned i, j;
2028         bool used_commit_ids[N_COMMIT_IDS];
2029         unsigned max_commit_id_sections[N_COMMIT_IDS];
2030         unsigned write_start, write_sections;
2031         unsigned continue_section;
2032         bool journal_empty;
2033         unsigned char unused, last_used, want_commit_seq;
2034
2035         if (ic->mode == 'R')
2036                 return;
2037
2038         if (ic->journal_uptodate)
2039                 return;
2040
2041         last_used = 0;
2042         write_start = 0;
2043
2044         if (!ic->just_formatted) {
2045                 DEBUG_print("reading journal\n");
2046                 rw_journal(ic, REQ_OP_READ, 0, 0, ic->journal_sections, NULL);
2047                 if (ic->journal_io)
2048                         DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal");
2049                 if (ic->journal_io) {
2050                         struct journal_completion crypt_comp;
2051                         crypt_comp.ic = ic;
2052                         crypt_comp.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp.comp);
2053                         crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0);
2054                         encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp);
2055                         wait_for_completion(&crypt_comp.comp);
2056                 }
2057                 DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal");
2058         }
2059
2060         if (dm_integrity_failed(ic))
2061                 goto clear_journal;
2062
2063         journal_empty = true;
2064         memset(used_commit_ids, 0, sizeof used_commit_ids);
2065         memset(max_commit_id_sections, 0, sizeof max_commit_id_sections);
2066         for (i = 0; i < ic->journal_sections; i++) {
2067                 for (j = 0; j < ic->journal_section_sectors; j++) {
2068                         int k;
2069                         struct journal_sector *js = access_journal(ic, i, j);
2070                         k = find_commit_seq(ic, i, j, js->commit_id);
2071                         if (k < 0)
2072                                 goto clear_journal;
2073                         used_commit_ids[k] = true;
2074                         max_commit_id_sections[k] = i;
2075                 }
2076                 if (journal_empty) {
2077                         for (j = 0; j < ic->journal_section_entries; j++) {
2078                                 struct journal_entry *je = access_journal_entry(ic, i, j);
2079                                 if (!journal_entry_is_unused(je)) {
2080                                         journal_empty = false;
2081                                         break;
2082                                 }
2083                         }
2084                 }
2085         }
2086
2087         if (!used_commit_ids[N_COMMIT_IDS - 1]) {
2088                 unused = N_COMMIT_IDS - 1;
2089                 while (unused && !used_commit_ids[unused - 1])
2090                         unused--;
2091         } else {
2092                 for (unused = 0; unused < N_COMMIT_IDS; unused++)
2093                         if (!used_commit_ids[unused])
2094                                 break;
2095                 if (unused == N_COMMIT_IDS) {
2096                         dm_integrity_io_error(ic, "journal commit ids", -EIO);
2097                         goto clear_journal;
2098                 }
2099         }
2100         DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n",
2101                     unused, used_commit_ids[0], used_commit_ids[1],
2102                     used_commit_ids[2], used_commit_ids[3]);
2103
2104         last_used = prev_commit_seq(unused);
2105         want_commit_seq = prev_commit_seq(last_used);
2106
2107         if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)])
2108                 journal_empty = true;
2109
2110         write_start = max_commit_id_sections[last_used] + 1;
2111         if (unlikely(write_start >= ic->journal_sections))
2112                 want_commit_seq = next_commit_seq(want_commit_seq);
2113         wraparound_section(ic, &write_start);
2114
2115         i = write_start;
2116         for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) {
2117                 for (j = 0; j < ic->journal_section_sectors; j++) {
2118                         struct journal_sector *js = access_journal(ic, i, j);
2119
2120                         if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) {
2121                                 /*
2122                                  * This could be caused by crash during writing.
2123                                  * We won't replay the inconsistent part of the
2124                                  * journal.
2125                                  */
2126                                 DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n",
2127                                             i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq);
2128                                 goto brk;
2129                         }
2130                 }
2131                 i++;
2132                 if (unlikely(i >= ic->journal_sections))
2133                         want_commit_seq = next_commit_seq(want_commit_seq);
2134                 wraparound_section(ic, &i);
2135         }
2136 brk:
2137
2138         if (!journal_empty) {
2139                 DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n",
2140                             write_sections, write_start, want_commit_seq);
2141                 do_journal_write(ic, write_start, write_sections, true);
2142         }
2143
2144         if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) {
2145                 continue_section = write_start;
2146                 ic->commit_seq = want_commit_seq;
2147                 DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq);
2148         } else {
2149                 unsigned s;
2150                 unsigned char erase_seq;
2151 clear_journal:
2152                 DEBUG_print("clearing journal\n");
2153
2154                 erase_seq = prev_commit_seq(prev_commit_seq(last_used));
2155                 s = write_start;
2156                 init_journal(ic, s, 1, erase_seq);
2157                 s++;
2158                 wraparound_section(ic, &s);
2159                 if (ic->journal_sections >= 2) {
2160                         init_journal(ic, s, ic->journal_sections - 2, erase_seq);
2161                         s += ic->journal_sections - 2;
2162                         wraparound_section(ic, &s);
2163                         init_journal(ic, s, 1, erase_seq);
2164                 }
2165
2166                 continue_section = 0;
2167                 ic->commit_seq = next_commit_seq(erase_seq);
2168         }
2169
2170         ic->committed_section = continue_section;
2171         ic->n_committed_sections = 0;
2172
2173         ic->uncommitted_section = continue_section;
2174         ic->n_uncommitted_sections = 0;
2175
2176         ic->free_section = continue_section;
2177         ic->free_section_entry = 0;
2178         ic->free_sectors = ic->journal_entries;
2179
2180         ic->journal_tree_root = RB_ROOT;
2181         for (i = 0; i < ic->journal_entries; i++)
2182                 init_journal_node(&ic->journal_tree[i]);
2183 }
2184
2185 static void dm_integrity_postsuspend(struct dm_target *ti)
2186 {
2187         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2188
2189         del_timer_sync(&ic->autocommit_timer);
2190
2191         ic->suspending = true;
2192
2193         queue_work(ic->commit_wq, &ic->commit_work);
2194         drain_workqueue(ic->commit_wq);
2195
2196         if (ic->mode == 'J') {
2197                 drain_workqueue(ic->writer_wq);
2198                 dm_integrity_flush_buffers(ic);
2199         }
2200
2201         ic->suspending = false;
2202
2203         BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
2204
2205         ic->journal_uptodate = true;
2206 }
2207
2208 static void dm_integrity_resume(struct dm_target *ti)
2209 {
2210         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2211
2212         replay_journal(ic);
2213 }
2214
2215 static void dm_integrity_status(struct dm_target *ti, status_type_t type,
2216                                 unsigned status_flags, char *result, unsigned maxlen)
2217 {
2218         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2219         unsigned arg_count;
2220         size_t sz = 0;
2221
2222         switch (type) {
2223         case STATUSTYPE_INFO:
2224                 result[0] = '\0';
2225                 break;
2226
2227         case STATUSTYPE_TABLE: {
2228                 __u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100;
2229                 watermark_percentage += ic->journal_entries / 2;
2230                 do_div(watermark_percentage, ic->journal_entries);
2231                 arg_count = 5;
2232                 arg_count += ic->sectors_per_block != 1;
2233                 arg_count += !!ic->internal_hash_alg.alg_string;
2234                 arg_count += !!ic->journal_crypt_alg.alg_string;
2235                 arg_count += !!ic->journal_mac_alg.alg_string;
2236                 DMEMIT("%s %llu %u %c %u", ic->dev->name, (unsigned long long)ic->start,
2237                        ic->tag_size, ic->mode, arg_count);
2238                 DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
2239                 DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors);
2240                 DMEMIT(" buffer_sectors:%u", 1U << ic->log2_buffer_sectors);
2241                 DMEMIT(" journal_watermark:%u", (unsigned)watermark_percentage);
2242                 DMEMIT(" commit_time:%u", ic->autocommit_msec);
2243                 if (ic->sectors_per_block != 1)
2244                         DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
2245
2246 #define EMIT_ALG(a, n)                                                  \
2247                 do {                                                    \
2248                         if (ic->a.alg_string) {                         \
2249                                 DMEMIT(" %s:%s", n, ic->a.alg_string);  \
2250                                 if (ic->a.key_string)                   \
2251                                         DMEMIT(":%s", ic->a.key_string);\
2252                         }                                               \
2253                 } while (0)
2254                 EMIT_ALG(internal_hash_alg, "internal_hash");
2255                 EMIT_ALG(journal_crypt_alg, "journal_crypt");
2256                 EMIT_ALG(journal_mac_alg, "journal_mac");
2257                 break;
2258         }
2259         }
2260 }
2261
2262 static int dm_integrity_iterate_devices(struct dm_target *ti,
2263                                         iterate_devices_callout_fn fn, void *data)
2264 {
2265         struct dm_integrity_c *ic = ti->private;
2266
2267         return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data);
2268 }
2269
2270 static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits)
2271 {
2272         struct dm_integrity_c *ic = ti->private;
2273
2274         if (ic->sectors_per_block > 1) {
2275                 limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
2276                 limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
2277                 blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT);
2278         }
2279 }
2280
2281 static void calculate_journal_section_size(struct dm_integrity_c *ic)
2282 {
2283         unsigned sector_space = JOURNAL_SECTOR_DATA;
2284
2285         ic->journal_sections = le32_to_cpu(ic->sb->journal_sections);
2286         ic->journal_entry_size = roundup(offsetof(struct journal_entry, last_bytes[ic->sectors_per_block]) + ic->tag_size,
2287                                          JOURNAL_ENTRY_ROUNDUP);
2288
2289         if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC))
2290                 sector_space -= JOURNAL_MAC_PER_SECTOR;
2291         ic->journal_entries_per_sector = sector_space / ic->journal_entry_size;
2292         ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS;
2293         ic->journal_section_sectors = (ic->journal_section_entries << ic->sb->log2_sectors_per_block) + JOURNAL_BLOCK_SECTORS;
2294         ic->journal_entries = ic->journal_section_entries * ic->journal_sections;
2295 }
2296
2297 static int calculate_device_limits(struct dm_integrity_c *ic)
2298 {
2299         __u64 initial_sectors;
2300         sector_t last_sector, last_area, last_offset;
2301
2302         calculate_journal_section_size(ic);
2303         initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections;
2304         if (initial_sectors + METADATA_PADDING_SECTORS >= ic->device_sectors || initial_sectors > UINT_MAX)
2305                 return -EINVAL;
2306         ic->initial_sectors = initial_sectors;
2307
2308         ic->metadata_run = roundup((__u64)ic->tag_size << (ic->sb->log2_interleave_sectors - ic->sb->log2_sectors_per_block),
2309                                    (__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS)) >> SECTOR_SHIFT;
2310         if (!(ic->metadata_run & (ic->metadata_run - 1)))
2311                 ic->log2_metadata_run = __ffs(ic->metadata_run);
2312         else
2313                 ic->log2_metadata_run = -1;
2314
2315         get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset);
2316         last_sector = get_data_sector(ic, last_area, last_offset);
2317
2318         if (ic->start + last_sector < last_sector || ic->start + last_sector >= ic->device_sectors)
2319                 return -EINVAL;
2320
2321         return 0;
2322 }
2323
2324 static int initialize_superblock(struct dm_integrity_c *ic, unsigned journal_sectors, unsigned interleave_sectors)
2325 {
2326         unsigned journal_sections;
2327         int test_bit;
2328
2329         memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT);
2330         memcpy(ic->sb->magic, SB_MAGIC, 8);
2331         ic->sb->version = SB_VERSION;
2332         ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size);
2333         ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block);
2334         if (ic->journal_mac_alg.alg_string)
2335                 ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC);
2336
2337         calculate_journal_section_size(ic);
2338         journal_sections = journal_sectors / ic->journal_section_sectors;
2339         if (!journal_sections)
2340                 journal_sections = 1;
2341         ic->sb->journal_sections = cpu_to_le32(journal_sections);
2342
2343         if (!interleave_sectors)
2344                 interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
2345         ic->sb->log2_interleave_sectors = __fls(interleave_sectors);
2346         ic->sb->log2_interleave_sectors = max((__u8)MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
2347         ic->sb->log2_interleave_sectors = min((__u8)MAX_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
2348
2349         ic->provided_data_sectors = 0;
2350         for (test_bit = fls64(ic->device_sectors) - 1; test_bit >= 3; test_bit--) {
2351                 __u64 prev_data_sectors = ic->provided_data_sectors;
2352
2353                 ic->provided_data_sectors |= (sector_t)1 << test_bit;
2354                 if (calculate_device_limits(ic))
2355                         ic->provided_data_sectors = prev_data_sectors;
2356         }
2357
2358         if (!ic->provided_data_sectors)
2359                 return -EINVAL;
2360
2361         ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
2362
2363         return 0;
2364 }
2365
2366 static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic)
2367 {
2368         struct gendisk *disk = dm_disk(dm_table_get_md(ti->table));
2369         struct blk_integrity bi;
2370
2371         memset(&bi, 0, sizeof(bi));
2372         bi.profile = &dm_integrity_profile;
2373         bi.tuple_size = ic->tag_size;
2374         bi.tag_size = bi.tuple_size;
2375         bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT;
2376
2377         blk_integrity_register(disk, &bi);
2378         blk_queue_max_integrity_segments(disk->queue, UINT_MAX);
2379 }
2380
2381 static void dm_integrity_free_page_list(struct dm_integrity_c *ic, struct page_list *pl)
2382 {
2383         unsigned i;
2384
2385         if (!pl)
2386                 return;
2387         for (i = 0; i < ic->journal_pages; i++)
2388                 if (pl[i].page)
2389                         __free_page(pl[i].page);
2390         kvfree(pl);
2391 }
2392
2393 static struct page_list *dm_integrity_alloc_page_list(struct dm_integrity_c *ic)
2394 {
2395         size_t page_list_desc_size = ic->journal_pages * sizeof(struct page_list);
2396         struct page_list *pl;
2397         unsigned i;
2398
2399         pl = kvmalloc(page_list_desc_size, GFP_KERNEL | __GFP_ZERO);
2400         if (!pl)
2401                 return NULL;
2402
2403         for (i = 0; i < ic->journal_pages; i++) {
2404                 pl[i].page = alloc_page(GFP_KERNEL);
2405                 if (!pl[i].page) {
2406                         dm_integrity_free_page_list(ic, pl);
2407                         return NULL;
2408                 }
2409                 if (i)
2410                         pl[i - 1].next = &pl[i];
2411         }
2412
2413         return pl;
2414 }
2415
2416 static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl)
2417 {
2418         unsigned i;
2419         for (i = 0; i < ic->journal_sections; i++)
2420                 kvfree(sl[i]);
2421         kfree(sl);
2422 }
2423
2424 static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic, struct page_list *pl)
2425 {
2426         struct scatterlist **sl;
2427         unsigned i;
2428
2429         sl = kvmalloc(ic->journal_sections * sizeof(struct scatterlist *), GFP_KERNEL | __GFP_ZERO);
2430         if (!sl)
2431                 return NULL;
2432
2433         for (i = 0; i < ic->journal_sections; i++) {
2434                 struct scatterlist *s;
2435                 unsigned start_index, start_offset;
2436                 unsigned end_index, end_offset;
2437                 unsigned n_pages;
2438                 unsigned idx;
2439
2440                 page_list_location(ic, i, 0, &start_index, &start_offset);
2441                 page_list_location(ic, i, ic->journal_section_sectors - 1, &end_index, &end_offset);
2442
2443                 n_pages = (end_index - start_index + 1);
2444
2445                 s = kvmalloc(n_pages * sizeof(struct scatterlist), GFP_KERNEL);
2446                 if (!s) {
2447                         dm_integrity_free_journal_scatterlist(ic, sl);
2448                         return NULL;
2449                 }
2450
2451                 sg_init_table(s, n_pages);
2452                 for (idx = start_index; idx <= end_index; idx++) {
2453                         char *va = lowmem_page_address(pl[idx].page);
2454                         unsigned start = 0, end = PAGE_SIZE;
2455                         if (idx == start_index)
2456                                 start = start_offset;
2457                         if (idx == end_index)
2458                                 end = end_offset + (1 << SECTOR_SHIFT);
2459                         sg_set_buf(&s[idx - start_index], va + start, end - start);
2460                 }
2461
2462                 sl[i] = s;
2463         }
2464
2465         return sl;
2466 }
2467
2468 static void free_alg(struct alg_spec *a)
2469 {
2470         kzfree(a->alg_string);
2471         kzfree(a->key);
2472         memset(a, 0, sizeof *a);
2473 }
2474
2475 static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval)
2476 {
2477         char *k;
2478
2479         free_alg(a);
2480
2481         a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL);
2482         if (!a->alg_string)
2483                 goto nomem;
2484
2485         k = strchr(a->alg_string, ':');
2486         if (k) {
2487                 *k = 0;
2488                 a->key_string = k + 1;
2489                 if (strlen(a->key_string) & 1)
2490                         goto inval;
2491
2492                 a->key_size = strlen(a->key_string) / 2;
2493                 a->key = kmalloc(a->key_size, GFP_KERNEL);
2494                 if (!a->key)
2495                         goto nomem;
2496                 if (hex2bin(a->key, a->key_string, a->key_size))
2497                         goto inval;
2498         }
2499
2500         return 0;
2501 inval:
2502         *error = error_inval;
2503         return -EINVAL;
2504 nomem:
2505         *error = "Out of memory for an argument";
2506         return -ENOMEM;
2507 }
2508
2509 static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error,
2510                    char *error_alg, char *error_key)
2511 {
2512         int r;
2513
2514         if (a->alg_string) {
2515                 *hash = crypto_alloc_shash(a->alg_string, 0, CRYPTO_ALG_ASYNC);
2516                 if (IS_ERR(*hash)) {
2517                         *error = error_alg;
2518                         r = PTR_ERR(*hash);
2519                         *hash = NULL;
2520                         return r;
2521                 }
2522
2523                 if (a->key) {
2524                         r = crypto_shash_setkey(*hash, a->key, a->key_size);
2525                         if (r) {
2526                                 *error = error_key;
2527                                 return r;
2528                         }
2529                 }
2530         }
2531
2532         return 0;
2533 }
2534
2535 static int create_journal(struct dm_integrity_c *ic, char **error)
2536 {
2537         int r = 0;
2538         unsigned i;
2539         __u64 journal_pages, journal_desc_size, journal_tree_size;
2540         unsigned char *crypt_data = NULL;
2541
2542         ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL);
2543         ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL);
2544         ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL);
2545         ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL);
2546
2547         journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
2548                                 PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
2549         journal_desc_size = journal_pages * sizeof(struct page_list);
2550         if (journal_pages >= totalram_pages - totalhigh_pages || journal_desc_size > ULONG_MAX) {
2551                 *error = "Journal doesn't fit into memory";
2552                 r = -ENOMEM;
2553                 goto bad;
2554         }
2555         ic->journal_pages = journal_pages;
2556
2557         ic->journal = dm_integrity_alloc_page_list(ic);
2558         if (!ic->journal) {
2559                 *error = "Could not allocate memory for journal";
2560                 r = -ENOMEM;
2561                 goto bad;
2562         }
2563         if (ic->journal_crypt_alg.alg_string) {
2564                 unsigned ivsize, blocksize;
2565                 struct journal_completion comp;
2566
2567                 comp.ic = ic;
2568                 ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, 0);
2569                 if (IS_ERR(ic->journal_crypt)) {
2570                         *error = "Invalid journal cipher";
2571                         r = PTR_ERR(ic->journal_crypt);
2572                         ic->journal_crypt = NULL;
2573                         goto bad;
2574                 }
2575                 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
2576                 blocksize = crypto_skcipher_blocksize(ic->journal_crypt);
2577
2578                 if (ic->journal_crypt_alg.key) {
2579                         r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key,
2580                                                    ic->journal_crypt_alg.key_size);
2581                         if (r) {
2582                                 *error = "Error setting encryption key";
2583                                 goto bad;
2584                         }
2585                 }
2586                 DEBUG_print("cipher %s, block size %u iv size %u\n",
2587                             ic->journal_crypt_alg.alg_string, blocksize, ivsize);
2588
2589                 ic->journal_io = dm_integrity_alloc_page_list(ic);
2590                 if (!ic->journal_io) {
2591                         *error = "Could not allocate memory for journal io";
2592                         r = -ENOMEM;
2593                         goto bad;
2594                 }
2595
2596                 if (blocksize == 1) {
2597                         struct scatterlist *sg;
2598                         SKCIPHER_REQUEST_ON_STACK(req, ic->journal_crypt);
2599                         unsigned char iv[ivsize];
2600                         skcipher_request_set_tfm(req, ic->journal_crypt);
2601
2602                         ic->journal_xor = dm_integrity_alloc_page_list(ic);
2603                         if (!ic->journal_xor) {
2604                                 *error = "Could not allocate memory for journal xor";
2605                                 r = -ENOMEM;
2606                                 goto bad;
2607                         }
2608
2609                         sg = kvmalloc((ic->journal_pages + 1) * sizeof(struct scatterlist), GFP_KERNEL);
2610                         if (!sg) {
2611                                 *error = "Unable to allocate sg list";
2612                                 r = -ENOMEM;
2613                                 goto bad;
2614                         }
2615                         sg_init_table(sg, ic->journal_pages + 1);
2616                         for (i = 0; i < ic->journal_pages; i++) {
2617                                 char *va = lowmem_page_address(ic->journal_xor[i].page);
2618                                 clear_page(va);
2619                                 sg_set_buf(&sg[i], va, PAGE_SIZE);
2620                         }
2621                         sg_set_buf(&sg[i], &ic->commit_ids, sizeof ic->commit_ids);
2622                         memset(iv, 0x00, ivsize);
2623
2624                         skcipher_request_set_crypt(req, sg, sg, PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, iv);
2625                         comp.comp = COMPLETION_INITIALIZER_ONSTACK(comp.comp);
2626                         comp.in_flight = (atomic_t)ATOMIC_INIT(1);
2627                         if (do_crypt(true, req, &comp))
2628                                 wait_for_completion(&comp.comp);
2629                         kvfree(sg);
2630                         r = dm_integrity_failed(ic);
2631                         if (r) {
2632                                 *error = "Unable to encrypt journal";
2633                                 goto bad;
2634                         }
2635                         DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data");
2636
2637                         crypto_free_skcipher(ic->journal_crypt);
2638                         ic->journal_crypt = NULL;
2639                 } else {
2640                         SKCIPHER_REQUEST_ON_STACK(req, ic->journal_crypt);
2641                         unsigned char iv[ivsize];
2642                         unsigned crypt_len = roundup(ivsize, blocksize);
2643
2644                         crypt_data = kmalloc(crypt_len, GFP_KERNEL);
2645                         if (!crypt_data) {
2646                                 *error = "Unable to allocate crypt data";
2647                                 r = -ENOMEM;
2648                                 goto bad;
2649                         }
2650
2651                         skcipher_request_set_tfm(req, ic->journal_crypt);
2652
2653                         ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal);
2654                         if (!ic->journal_scatterlist) {
2655                                 *error = "Unable to allocate sg list";
2656                                 r = -ENOMEM;
2657                                 goto bad;
2658                         }
2659                         ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io);
2660                         if (!ic->journal_io_scatterlist) {
2661                                 *error = "Unable to allocate sg list";
2662                                 r = -ENOMEM;
2663                                 goto bad;
2664                         }
2665                         ic->sk_requests = kvmalloc(ic->journal_sections * sizeof(struct skcipher_request *), GFP_KERNEL | __GFP_ZERO);
2666                         if (!ic->sk_requests) {
2667                                 *error = "Unable to allocate sk requests";
2668                                 r = -ENOMEM;
2669                                 goto bad;
2670                         }
2671                         for (i = 0; i < ic->journal_sections; i++) {
2672                                 struct scatterlist sg;
2673                                 struct skcipher_request *section_req;
2674                                 __u32 section_le = cpu_to_le32(i);
2675
2676                                 memset(iv, 0x00, ivsize);
2677                                 memset(crypt_data, 0x00, crypt_len);
2678                                 memcpy(crypt_data, &section_le, min((size_t)crypt_len, sizeof(section_le)));
2679
2680                                 sg_init_one(&sg, crypt_data, crypt_len);
2681                                 skcipher_request_set_crypt(req, &sg, &sg, crypt_len, iv);
2682                                 comp.comp = COMPLETION_INITIALIZER_ONSTACK(comp.comp);
2683                                 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
2684                                 if (do_crypt(true, req, &comp))
2685                                         wait_for_completion(&comp.comp);
2686
2687                                 r = dm_integrity_failed(ic);
2688                                 if (r) {
2689                                         *error = "Unable to generate iv";
2690                                         goto bad;
2691                                 }
2692
2693                                 section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
2694                                 if (!section_req) {
2695                                         *error = "Unable to allocate crypt request";
2696                                         r = -ENOMEM;
2697                                         goto bad;
2698                                 }
2699                                 section_req->iv = kmalloc(ivsize * 2, GFP_KERNEL);
2700                                 if (!section_req->iv) {
2701                                         skcipher_request_free(section_req);
2702                                         *error = "Unable to allocate iv";
2703                                         r = -ENOMEM;
2704                                         goto bad;
2705                                 }
2706                                 memcpy(section_req->iv + ivsize, crypt_data, ivsize);
2707                                 section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT;
2708                                 ic->sk_requests[i] = section_req;
2709                                 DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i);
2710                         }
2711                 }
2712         }
2713
2714         for (i = 0; i < N_COMMIT_IDS; i++) {
2715                 unsigned j;
2716 retest_commit_id:
2717                 for (j = 0; j < i; j++) {
2718                         if (ic->commit_ids[j] == ic->commit_ids[i]) {
2719                                 ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1);
2720                                 goto retest_commit_id;
2721                         }
2722                 }
2723                 DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]);
2724         }
2725
2726         journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node);
2727         if (journal_tree_size > ULONG_MAX) {
2728                 *error = "Journal doesn't fit into memory";
2729                 r = -ENOMEM;
2730                 goto bad;
2731         }
2732         ic->journal_tree = kvmalloc(journal_tree_size, GFP_KERNEL);
2733         if (!ic->journal_tree) {
2734                 *error = "Could not allocate memory for journal tree";
2735                 r = -ENOMEM;
2736         }
2737 bad:
2738         kfree(crypt_data);
2739         return r;
2740 }
2741
2742 /*
2743  * Construct a integrity mapping
2744  *
2745  * Arguments:
2746  *      device
2747  *      offset from the start of the device
2748  *      tag size
2749  *      D - direct writes, J - journal writes, R - recovery mode
2750  *      number of optional arguments
2751  *      optional arguments:
2752  *              journal_sectors
2753  *              interleave_sectors
2754  *              buffer_sectors
2755  *              journal_watermark
2756  *              commit_time
2757  *              internal_hash
2758  *              journal_crypt
2759  *              journal_mac
2760  *              block_size
2761  */
2762 static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
2763 {
2764         struct dm_integrity_c *ic;
2765         char dummy;
2766         int r;
2767         unsigned extra_args;
2768         struct dm_arg_set as;
2769         static struct dm_arg _args[] = {
2770                 {0, 9, "Invalid number of feature args"},
2771         };
2772         unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
2773         bool should_write_sb;
2774         __u64 threshold;
2775         unsigned long long start;
2776
2777 #define DIRECT_ARGUMENTS        4
2778
2779         if (argc <= DIRECT_ARGUMENTS) {
2780                 ti->error = "Invalid argument count";
2781                 return -EINVAL;
2782         }
2783
2784         ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL);
2785         if (!ic) {
2786                 ti->error = "Cannot allocate integrity context";
2787                 return -ENOMEM;
2788         }
2789         ti->private = ic;
2790         ti->per_io_data_size = sizeof(struct dm_integrity_io);
2791
2792         ic->in_progress = RB_ROOT;
2793         init_waitqueue_head(&ic->endio_wait);
2794         bio_list_init(&ic->flush_bio_list);
2795         init_waitqueue_head(&ic->copy_to_journal_wait);
2796         init_completion(&ic->crypto_backoff);
2797
2798         r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
2799         if (r) {
2800                 ti->error = "Device lookup failed";
2801                 goto bad;
2802         }
2803
2804         if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) {
2805                 ti->error = "Invalid starting offset";
2806                 r = -EINVAL;
2807                 goto bad;
2808         }
2809         ic->start = start;
2810
2811         if (strcmp(argv[2], "-")) {
2812                 if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) {
2813                         ti->error = "Invalid tag size";
2814                         r = -EINVAL;
2815                         goto bad;
2816                 }
2817         }
2818
2819         if (!strcmp(argv[3], "J") || !strcmp(argv[3], "D") || !strcmp(argv[3], "R"))
2820                 ic->mode = argv[3][0];
2821         else {
2822                 ti->error = "Invalid mode (expecting J, D, R)";
2823                 r = -EINVAL;
2824                 goto bad;
2825         }
2826
2827         ic->device_sectors = i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT;
2828         journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS,
2829                         ic->device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR);
2830         interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
2831         buffer_sectors = DEFAULT_BUFFER_SECTORS;
2832         journal_watermark = DEFAULT_JOURNAL_WATERMARK;
2833         sync_msec = DEFAULT_SYNC_MSEC;
2834         ic->sectors_per_block = 1;
2835
2836         as.argc = argc - DIRECT_ARGUMENTS;
2837         as.argv = argv + DIRECT_ARGUMENTS;
2838         r = dm_read_arg_group(_args, &as, &extra_args, &ti->error);
2839         if (r)
2840                 goto bad;
2841
2842         while (extra_args--) {
2843                 const char *opt_string;
2844                 unsigned val;
2845                 opt_string = dm_shift_arg(&as);
2846                 if (!opt_string) {
2847                         r = -EINVAL;
2848                         ti->error = "Not enough feature arguments";
2849                         goto bad;
2850                 }
2851                 if (sscanf(opt_string, "journal_sectors:%u%c", &val, &dummy) == 1)
2852                         journal_sectors = val;
2853                 else if (sscanf(opt_string, "interleave_sectors:%u%c", &val, &dummy) == 1)
2854                         interleave_sectors = val;
2855                 else if (sscanf(opt_string, "buffer_sectors:%u%c", &val, &dummy) == 1)
2856                         buffer_sectors = val;
2857                 else if (sscanf(opt_string, "journal_watermark:%u%c", &val, &dummy) == 1 && val <= 100)
2858                         journal_watermark = val;
2859                 else if (sscanf(opt_string, "commit_time:%u%c", &val, &dummy) == 1)
2860                         sync_msec = val;
2861                 else if (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) {
2862                         if (val < 1 << SECTOR_SHIFT ||
2863                             val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT ||
2864                             (val & (val -1))) {
2865                                 r = -EINVAL;
2866                                 ti->error = "Invalid block_size argument";
2867                                 goto bad;
2868                         }
2869                         ic->sectors_per_block = val >> SECTOR_SHIFT;
2870                 } else if (!memcmp(opt_string, "internal_hash:", strlen("internal_hash:"))) {
2871                         r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error,
2872                                             "Invalid internal_hash argument");
2873                         if (r)
2874                                 goto bad;
2875                 } else if (!memcmp(opt_string, "journal_crypt:", strlen("journal_crypt:"))) {
2876                         r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error,
2877                                             "Invalid journal_crypt argument");
2878                         if (r)
2879                                 goto bad;
2880                 } else if (!memcmp(opt_string, "journal_mac:", strlen("journal_mac:"))) {
2881                         r = get_alg_and_key(opt_string, &ic->journal_mac_alg,  &ti->error,
2882                                             "Invalid journal_mac argument");
2883                         if (r)
2884                                 goto bad;
2885                 } else {
2886                         r = -EINVAL;
2887                         ti->error = "Invalid argument";
2888                         goto bad;
2889                 }
2890         }
2891
2892         r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error,
2893                     "Invalid internal hash", "Error setting internal hash key");
2894         if (r)
2895                 goto bad;
2896
2897         r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error,
2898                     "Invalid journal mac", "Error setting journal mac key");
2899         if (r)
2900                 goto bad;
2901
2902         if (!ic->tag_size) {
2903                 if (!ic->internal_hash) {
2904                         ti->error = "Unknown tag size";
2905                         r = -EINVAL;
2906                         goto bad;
2907                 }
2908                 ic->tag_size = crypto_shash_digestsize(ic->internal_hash);
2909         }
2910         if (ic->tag_size > MAX_TAG_SIZE) {
2911                 ti->error = "Too big tag size";
2912                 r = -EINVAL;
2913                 goto bad;
2914         }
2915         if (!(ic->tag_size & (ic->tag_size - 1)))
2916                 ic->log2_tag_size = __ffs(ic->tag_size);
2917         else
2918                 ic->log2_tag_size = -1;
2919
2920         ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
2921         ic->autocommit_msec = sync_msec;
2922         setup_timer(&ic->autocommit_timer, autocommit_fn, (unsigned long)ic);
2923
2924         ic->io = dm_io_client_create();
2925         if (IS_ERR(ic->io)) {
2926                 r = PTR_ERR(ic->io);
2927                 ic->io = NULL;
2928                 ti->error = "Cannot allocate dm io";
2929                 goto bad;
2930         }
2931
2932         ic->journal_io_mempool = mempool_create_slab_pool(JOURNAL_IO_MEMPOOL, journal_io_cache);
2933         if (!ic->journal_io_mempool) {
2934                 r = -ENOMEM;
2935                 ti->error = "Cannot allocate mempool";
2936                 goto bad;
2937         }
2938
2939         ic->metadata_wq = alloc_workqueue("dm-integrity-metadata",
2940                                           WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE);
2941         if (!ic->metadata_wq) {
2942                 ti->error = "Cannot allocate workqueue";
2943                 r = -ENOMEM;
2944                 goto bad;
2945         }
2946
2947         /*
2948          * If this workqueue were percpu, it would cause bio reordering
2949          * and reduced performance.
2950          */
2951         ic->wait_wq = alloc_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
2952         if (!ic->wait_wq) {
2953                 ti->error = "Cannot allocate workqueue";
2954                 r = -ENOMEM;
2955                 goto bad;
2956         }
2957
2958         ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1);
2959         if (!ic->commit_wq) {
2960                 ti->error = "Cannot allocate workqueue";
2961                 r = -ENOMEM;
2962                 goto bad;
2963         }
2964         INIT_WORK(&ic->commit_work, integrity_commit);
2965
2966         if (ic->mode == 'J') {
2967                 ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1);
2968                 if (!ic->writer_wq) {
2969                         ti->error = "Cannot allocate workqueue";
2970                         r = -ENOMEM;
2971                         goto bad;
2972                 }
2973                 INIT_WORK(&ic->writer_work, integrity_writer);
2974         }
2975
2976         ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL);
2977         if (!ic->sb) {
2978                 r = -ENOMEM;
2979                 ti->error = "Cannot allocate superblock area";
2980                 goto bad;
2981         }
2982
2983         r = sync_rw_sb(ic, REQ_OP_READ, 0);
2984         if (r) {
2985                 ti->error = "Error reading superblock";
2986                 goto bad;
2987         }
2988         should_write_sb = false;
2989         if (memcmp(ic->sb->magic, SB_MAGIC, 8)) {
2990                 if (ic->mode != 'R') {
2991                         if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) {
2992                                 r = -EINVAL;
2993                                 ti->error = "The device is not initialized";
2994                                 goto bad;
2995                         }
2996                 }
2997
2998                 r = initialize_superblock(ic, journal_sectors, interleave_sectors);
2999                 if (r) {
3000                         ti->error = "Could not initialize superblock";
3001                         goto bad;
3002                 }
3003                 if (ic->mode != 'R')
3004                         should_write_sb = true;
3005         }
3006
3007         if (ic->sb->version != SB_VERSION) {
3008                 r = -EINVAL;
3009                 ti->error = "Unknown version";
3010                 goto bad;
3011         }
3012         if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) {
3013                 r = -EINVAL;
3014                 ti->error = "Tag size doesn't match the information in superblock";
3015                 goto bad;
3016         }
3017         if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) {
3018                 r = -EINVAL;
3019                 ti->error = "Block size doesn't match the information in superblock";
3020                 goto bad;
3021         }
3022         /* make sure that ti->max_io_len doesn't overflow */
3023         if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS ||
3024             ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) {
3025                 r = -EINVAL;
3026                 ti->error = "Invalid interleave_sectors in the superblock";
3027                 goto bad;
3028         }
3029         ic->provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
3030         if (ic->provided_data_sectors != le64_to_cpu(ic->sb->provided_data_sectors)) {
3031                 /* test for overflow */
3032                 r = -EINVAL;
3033                 ti->error = "The superblock has 64-bit device size, but the kernel was compiled with 32-bit sectors";
3034                 goto bad;
3035         }
3036         if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
3037                 r = -EINVAL;
3038                 ti->error = "Journal mac mismatch";
3039                 goto bad;
3040         }
3041         r = calculate_device_limits(ic);
3042         if (r) {
3043                 ti->error = "The device is too small";
3044                 goto bad;
3045         }
3046         if (ti->len > ic->provided_data_sectors) {
3047                 r = -EINVAL;
3048                 ti->error = "Not enough provided sectors for requested mapping size";
3049                 goto bad;
3050         }
3051
3052         if (!buffer_sectors)
3053                 buffer_sectors = 1;
3054         ic->log2_buffer_sectors = min3((int)__fls(buffer_sectors), (int)__ffs(ic->metadata_run), 31 - SECTOR_SHIFT);
3055
3056         threshold = (__u64)ic->journal_entries * (100 - journal_watermark);
3057         threshold += 50;
3058         do_div(threshold, 100);
3059         ic->free_sectors_threshold = threshold;
3060
3061         DEBUG_print("initialized:\n");
3062         DEBUG_print("   integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size));
3063         DEBUG_print("   journal_entry_size %u\n", ic->journal_entry_size);
3064         DEBUG_print("   journal_entries_per_sector %u\n", ic->journal_entries_per_sector);
3065         DEBUG_print("   journal_section_entries %u\n", ic->journal_section_entries);
3066         DEBUG_print("   journal_section_sectors %u\n", ic->journal_section_sectors);
3067         DEBUG_print("   journal_sections %u\n", (unsigned)le32_to_cpu(ic->sb->journal_sections));
3068         DEBUG_print("   journal_entries %u\n", ic->journal_entries);
3069         DEBUG_print("   log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors);
3070         DEBUG_print("   device_sectors 0x%llx\n", (unsigned long long)ic->device_sectors);
3071         DEBUG_print("   initial_sectors 0x%x\n", ic->initial_sectors);
3072         DEBUG_print("   metadata_run 0x%x\n", ic->metadata_run);
3073         DEBUG_print("   log2_metadata_run %d\n", ic->log2_metadata_run);
3074         DEBUG_print("   provided_data_sectors 0x%llx (%llu)\n", (unsigned long long)ic->provided_data_sectors,
3075                     (unsigned long long)ic->provided_data_sectors);
3076         DEBUG_print("   log2_buffer_sectors %u\n", ic->log2_buffer_sectors);
3077
3078         ic->bufio = dm_bufio_client_create(ic->dev->bdev, 1U << (SECTOR_SHIFT + ic->log2_buffer_sectors),
3079                                            1, 0, NULL, NULL);
3080         if (IS_ERR(ic->bufio)) {
3081                 r = PTR_ERR(ic->bufio);
3082                 ti->error = "Cannot initialize dm-bufio";
3083                 ic->bufio = NULL;
3084                 goto bad;
3085         }
3086         dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors);
3087
3088         if (ic->mode != 'R') {
3089                 r = create_journal(ic, &ti->error);
3090                 if (r)
3091                         goto bad;
3092         }
3093
3094         if (should_write_sb) {
3095                 int r;
3096
3097                 init_journal(ic, 0, ic->journal_sections, 0);
3098                 r = dm_integrity_failed(ic);
3099                 if (unlikely(r)) {
3100                         ti->error = "Error initializing journal";
3101                         goto bad;
3102                 }
3103                 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
3104                 if (r) {
3105                         ti->error = "Error initializing superblock";
3106                         goto bad;
3107                 }
3108                 ic->just_formatted = true;
3109         }
3110
3111         r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors);
3112         if (r)
3113                 goto bad;
3114
3115         if (!ic->internal_hash)
3116                 dm_integrity_set(ti, ic);
3117
3118         ti->num_flush_bios = 1;
3119         ti->flush_supported = true;
3120
3121         return 0;
3122 bad:
3123         dm_integrity_dtr(ti);
3124         return r;
3125 }
3126
3127 static void dm_integrity_dtr(struct dm_target *ti)
3128 {
3129         struct dm_integrity_c *ic = ti->private;
3130
3131         BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
3132
3133         if (ic->metadata_wq)
3134                 destroy_workqueue(ic->metadata_wq);
3135         if (ic->wait_wq)
3136                 destroy_workqueue(ic->wait_wq);
3137         if (ic->commit_wq)
3138                 destroy_workqueue(ic->commit_wq);
3139         if (ic->writer_wq)
3140                 destroy_workqueue(ic->writer_wq);
3141         if (ic->bufio)
3142                 dm_bufio_client_destroy(ic->bufio);
3143         mempool_destroy(ic->journal_io_mempool);
3144         if (ic->io)
3145                 dm_io_client_destroy(ic->io);
3146         if (ic->dev)
3147                 dm_put_device(ti, ic->dev);
3148         dm_integrity_free_page_list(ic, ic->journal);
3149         dm_integrity_free_page_list(ic, ic->journal_io);
3150         dm_integrity_free_page_list(ic, ic->journal_xor);
3151         if (ic->journal_scatterlist)
3152                 dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist);
3153         if (ic->journal_io_scatterlist)
3154                 dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist);
3155         if (ic->sk_requests) {
3156                 unsigned i;
3157
3158                 for (i = 0; i < ic->journal_sections; i++) {
3159                         struct skcipher_request *req = ic->sk_requests[i];
3160                         if (req) {
3161                                 kzfree(req->iv);
3162                                 skcipher_request_free(req);
3163                         }
3164                 }
3165                 kvfree(ic->sk_requests);
3166         }
3167         kvfree(ic->journal_tree);
3168         if (ic->sb)
3169                 free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT);
3170
3171         if (ic->internal_hash)
3172                 crypto_free_shash(ic->internal_hash);
3173         free_alg(&ic->internal_hash_alg);
3174
3175         if (ic->journal_crypt)
3176                 crypto_free_skcipher(ic->journal_crypt);
3177         free_alg(&ic->journal_crypt_alg);
3178
3179         if (ic->journal_mac)
3180                 crypto_free_shash(ic->journal_mac);
3181         free_alg(&ic->journal_mac_alg);
3182
3183         kfree(ic);
3184 }
3185
3186 static struct target_type integrity_target = {
3187         .name                   = "integrity",
3188         .version                = {1, 0, 0},
3189         .module                 = THIS_MODULE,
3190         .features               = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
3191         .ctr                    = dm_integrity_ctr,
3192         .dtr                    = dm_integrity_dtr,
3193         .map                    = dm_integrity_map,
3194         .postsuspend            = dm_integrity_postsuspend,
3195         .resume                 = dm_integrity_resume,
3196         .status                 = dm_integrity_status,
3197         .iterate_devices        = dm_integrity_iterate_devices,
3198         .io_hints               = dm_integrity_io_hints,
3199 };
3200
3201 int __init dm_integrity_init(void)
3202 {
3203         int r;
3204
3205         journal_io_cache = kmem_cache_create("integrity_journal_io",
3206                                              sizeof(struct journal_io), 0, 0, NULL);
3207         if (!journal_io_cache) {
3208                 DMERR("can't allocate journal io cache");
3209                 return -ENOMEM;
3210         }
3211
3212         r = dm_register_target(&integrity_target);
3213
3214         if (r < 0)
3215                 DMERR("register failed %d", r);
3216
3217         return r;
3218 }
3219
3220 void dm_integrity_exit(void)
3221 {
3222         dm_unregister_target(&integrity_target);
3223         kmem_cache_destroy(journal_io_cache);
3224 }
3225
3226 module_init(dm_integrity_init);
3227 module_exit(dm_integrity_exit);
3228
3229 MODULE_AUTHOR("Milan Broz");
3230 MODULE_AUTHOR("Mikulas Patocka");
3231 MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension");
3232 MODULE_LICENSE("GPL");