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         int bi_error;
 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, commit_start, commit_sections, &io_comp);
 787         } else {
 788                 unsigned to_end;
 789                 io_comp.in_flight = (atomic_t)ATOMIC_INIT(2);
 790                 to_end = ic->journal_sections - commit_start;
 791                 if (ic->journal_io) {
 792                         crypt_comp_1.ic = ic;
 793                         crypt_comp_1.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_1.comp);
 794                         crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
 795                         encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1);
 796                         if (try_wait_for_completion(&crypt_comp_1.comp)) {
 797                                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
 798                                 crypt_comp_1.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_1.comp);
 799                                 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
 800                                 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1);
 801                                 wait_for_completion_io(&crypt_comp_1.comp);
 802                         } else {
 803                                 crypt_comp_2.ic = ic;
 804                                 crypt_comp_2.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp_2.comp);
 805                                 crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0);
 806                                 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2);
 807                                 wait_for_completion_io(&crypt_comp_1.comp);
 808                                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
 809                                 wait_for_completion_io(&crypt_comp_2.comp);
 810                         }
 811                 } else {
 812                         for (i = 0; i < to_end; i++)
 813                                 rw_section_mac(ic, commit_start + i, true);
 814                         rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
 815                         for (i = 0; i < commit_sections - to_end; i++)
 816                                 rw_section_mac(ic, i, true);
 817                 }
 818                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, 0, commit_sections - to_end, &io_comp);
 819         }
 820
 821         wait_for_completion_io(&io_comp.comp);
 822 }
 823
 824 static void copy_from_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset,
 825                               unsigned n_sectors, sector_t target, io_notify_fn fn, void *data)
 826 {
 827         struct dm_io_request io_req;
 828         struct dm_io_region io_loc;
 829         int r;
 830         unsigned sector, pl_index, pl_offset;
 831
 832         BUG_ON((target | n_sectors | offset) & (unsigned)(ic->sectors_per_block - 1));
 833
 834         if (unlikely(dm_integrity_failed(ic))) {
 835                 fn(-1UL, data);
 836                 return;
 837         }
 838
 839         sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset;
 840
 841         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
 842         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
 843
 844         io_req.bi_op = REQ_OP_WRITE;
 845         io_req.bi_op_flags = 0;
 846         io_req.mem.type = DM_IO_PAGE_LIST;
 847         io_req.mem.ptr.pl = &ic->journal[pl_index];
 848         io_req.mem.offset = pl_offset;
 849         io_req.notify.fn = fn;
 850         io_req.notify.context = data;
 851         io_req.client = ic->io;
 852         io_loc.bdev = ic->dev->bdev;
 853         io_loc.sector = ic->start + target;
 854         io_loc.count = n_sectors;
 855
 856         r = dm_io(&io_req, 1, &io_loc, NULL);
 857         if (unlikely(r)) {
 858                 WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
 859                 fn(-1UL, data);
 860         }
 861 }
 862
 863 static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
 864 {
 865         struct rb_node **n = &ic->in_progress.rb_node;
 866         struct rb_node *parent;
 867
 868         BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned)(ic->sectors_per_block - 1));
 869
 870         parent = NULL;
 871
 872         while (*n) {
 873                 struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node);
 874
 875                 parent = *n;
 876                 if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector) {
 877                         n = &range->node.rb_left;
 878                 } else if (new_range->logical_sector >= range->logical_sector + range->n_sectors) {
 879                         n = &range->node.rb_right;
 880                 } else {
 881                         return false;
 882                 }
 883         }
 884
 885         rb_link_node(&new_range->node, parent, n);
 886         rb_insert_color(&new_range->node, &ic->in_progress);
 887
 888         return true;
 889 }
 890
 891 static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range)
 892 {
 893         rb_erase(&range->node, &ic->in_progress);
 894         wake_up_locked(&ic->endio_wait);
 895 }
 896
 897 static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range)
 898 {
 899         unsigned long flags;
 900
 901         spin_lock_irqsave(&ic->endio_wait.lock, flags);
 902         remove_range_unlocked(ic, range);
 903         spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
 904 }
 905
 906 static void init_journal_node(struct journal_node *node)
 907 {
 908         RB_CLEAR_NODE(&node->node);
 909         node->sector = (sector_t)-1;
 910 }
 911
 912 static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector)
 913 {
 914         struct rb_node **link;
 915         struct rb_node *parent;
 916
 917         node->sector = sector;
 918         BUG_ON(!RB_EMPTY_NODE(&node->node));
 919
 920         link = &ic->journal_tree_root.rb_node;
 921         parent = NULL;
 922
 923         while (*link) {
 924                 struct journal_node *j;
 925                 parent = *link;
 926                 j = container_of(parent, struct journal_node, node);
 927                 if (sector < j->sector)
 928                         link = &j->node.rb_left;
 929                 else
 930                         link = &j->node.rb_right;
 931         }
 932
 933         rb_link_node(&node->node, parent, link);
 934         rb_insert_color(&node->node, &ic->journal_tree_root);
 935 }
 936
 937 static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node)
 938 {
 939         BUG_ON(RB_EMPTY_NODE(&node->node));
 940         rb_erase(&node->node, &ic->journal_tree_root);
 941         init_journal_node(node);
 942 }
 943
 944 #define NOT_FOUND       (-1U)
 945
 946 static unsigned find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector)
 947 {
 948         struct rb_node *n = ic->journal_tree_root.rb_node;
 949         unsigned found = NOT_FOUND;
 950         *next_sector = (sector_t)-1;
 951         while (n) {
 952                 struct journal_node *j = container_of(n, struct journal_node, node);
 953                 if (sector == j->sector) {
 954                         found = j - ic->journal_tree;
 955                 }
 956                 if (sector < j->sector) {
 957                         *next_sector = j->sector;
 958                         n = j->node.rb_left;
 959                 } else {
 960                         n = j->node.rb_right;
 961                 }
 962         }
 963
 964         return found;
 965 }
 966
 967 static bool test_journal_node(struct dm_integrity_c *ic, unsigned pos, sector_t sector)
 968 {
 969         struct journal_node *node, *next_node;
 970         struct rb_node *next;
 971
 972         if (unlikely(pos >= ic->journal_entries))
 973                 return false;
 974         node = &ic->journal_tree[pos];
 975         if (unlikely(RB_EMPTY_NODE(&node->node)))
 976                 return false;
 977         if (unlikely(node->sector != sector))
 978                 return false;
 979
 980         next = rb_next(&node->node);
 981         if (unlikely(!next))
 982                 return true;
 983
 984         next_node = container_of(next, struct journal_node, node);
 985         return next_node->sector != sector;
 986 }
 987
 988 static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node)
 989 {
 990         struct rb_node *next;
 991         struct journal_node *next_node;
 992         unsigned next_section;
 993
 994         BUG_ON(RB_EMPTY_NODE(&node->node));
 995
 996         next = rb_next(&node->node);
 997         if (unlikely(!next))
 998                 return false;
 999
1000         next_node = container_of(next, struct journal_node, node);
1001
1002         if (next_node->sector != node->sector)
1003                 return false;
1004
1005         next_section = (unsigned)(next_node - ic->journal_tree) / ic->journal_section_entries;
1006         if (next_section >= ic->committed_section &&
1007             next_section < ic->committed_section + ic->n_committed_sections)
1008                 return true;
1009         if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections)
1010                 return true;
1011
1012         return false;
1013 }
1014
1015 #define TAG_READ        0
1016 #define TAG_WRITE       1
1017 #define TAG_CMP         2
1018
1019 static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block,
1020                                unsigned *metadata_offset, unsigned total_size, int op)
1021 {
1022         do {
1023                 unsigned char *data, *dp;
1024                 struct dm_buffer *b;
1025                 unsigned to_copy;
1026                 int r;
1027
1028                 r = dm_integrity_failed(ic);
1029                 if (unlikely(r))
1030                         return r;
1031
1032                 data = dm_bufio_read(ic->bufio, *metadata_block, &b);
1033                 if (unlikely(IS_ERR(data)))
1034                         return PTR_ERR(data);
1035
1036                 to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size);
1037                 dp = data + *metadata_offset;
1038                 if (op == TAG_READ) {
1039                         memcpy(tag, dp, to_copy);
1040                 } else if (op == TAG_WRITE) {
1041                         memcpy(dp, tag, to_copy);
1042                         dm_bufio_mark_buffer_dirty(b);
1043                 } else  {
1044                         /* e.g.: op == TAG_CMP */
1045                         if (unlikely(memcmp(dp, tag, to_copy))) {
1046                                 unsigned i;
1047
1048                                 for (i = 0; i < to_copy; i++) {
1049                                         if (dp[i] != tag[i])
1050                                                 break;
1051                                         total_size--;
1052                                 }
1053                                 dm_bufio_release(b);
1054                                 return total_size;
1055                         }
1056                 }
1057                 dm_bufio_release(b);
1058
1059                 tag += to_copy;
1060                 *metadata_offset += to_copy;
1061                 if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) {
1062                         (*metadata_block)++;
1063                         *metadata_offset = 0;
1064                 }
1065                 total_size -= to_copy;
1066         } while (unlikely(total_size));
1067
1068         return 0;
1069 }
1070
1071 static void dm_integrity_flush_buffers(struct dm_integrity_c *ic)
1072 {
1073         int r;
1074         r = dm_bufio_write_dirty_buffers(ic->bufio);
1075         if (unlikely(r))
1076                 dm_integrity_io_error(ic, "writing tags", r);
1077 }
1078
1079 static void sleep_on_endio_wait(struct dm_integrity_c *ic)
1080 {
1081         DECLARE_WAITQUEUE(wait, current);
1082         __add_wait_queue(&ic->endio_wait, &wait);
1083         __set_current_state(TASK_UNINTERRUPTIBLE);
1084         spin_unlock_irq(&ic->endio_wait.lock);
1085         io_schedule();
1086         spin_lock_irq(&ic->endio_wait.lock);
1087         __remove_wait_queue(&ic->endio_wait, &wait);
1088 }
1089
1090 static void autocommit_fn(unsigned long data)
1091 {
1092         struct dm_integrity_c *ic = (struct dm_integrity_c *)data;
1093
1094         if (likely(!dm_integrity_failed(ic)))
1095                 queue_work(ic->commit_wq, &ic->commit_work);
1096 }
1097
1098 static void schedule_autocommit(struct dm_integrity_c *ic)
1099 {
1100         if (!timer_pending(&ic->autocommit_timer))
1101                 mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies);
1102 }
1103
1104 static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1105 {
1106         struct bio *bio;
1107         spin_lock_irq(&ic->endio_wait.lock);
1108         bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1109         bio_list_add(&ic->flush_bio_list, bio);
1110         spin_unlock_irq(&ic->endio_wait.lock);
1111         queue_work(ic->commit_wq, &ic->commit_work);
1112 }
1113
1114 static void do_endio(struct dm_integrity_c *ic, struct bio *bio)
1115 {
1116         int r = dm_integrity_failed(ic);
1117         if (unlikely(r) && !bio->bi_error)
1118                 bio->bi_error = r;
1119         bio_endio(bio);
1120 }
1121
1122 static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1123 {
1124         struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1125
1126         if (unlikely(dio->fua) && likely(!bio->bi_error) && likely(!dm_integrity_failed(ic)))
1127                 submit_flush_bio(ic, dio);
1128         else
1129                 do_endio(ic, bio);
1130 }
1131
1132 static void dec_in_flight(struct dm_integrity_io *dio)
1133 {
1134         if (atomic_dec_and_test(&dio->in_flight)) {
1135                 struct dm_integrity_c *ic = dio->ic;
1136                 struct bio *bio;
1137
1138                 remove_range(ic, &dio->range);
1139
1140                 if (unlikely(dio->write))
1141                         schedule_autocommit(ic);
1142
1143                 bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1144
1145                 if (unlikely(dio->bi_error) && !bio->bi_error)
1146                         bio->bi_error = dio->bi_error;
1147                 if (likely(!bio->bi_error) && unlikely(bio_sectors(bio) != dio->range.n_sectors)) {
1148                         dio->range.logical_sector += dio->range.n_sectors;
1149                         bio_advance(bio, dio->range.n_sectors << SECTOR_SHIFT);
1150                         INIT_WORK(&dio->work, integrity_bio_wait);
1151                         queue_work(ic->wait_wq, &dio->work);
1152                         return;
1153                 }
1154                 do_endio_flush(ic, dio);
1155         }
1156 }
1157
1158 static void integrity_end_io(struct bio *bio)
1159 {
1160         struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1161
1162         bio->bi_iter = dio->orig_bi_iter;
1163         bio->bi_bdev = dio->orig_bi_bdev;
1164         if (dio->orig_bi_integrity) {
1165                 bio->bi_integrity = dio->orig_bi_integrity;
1166                 bio->bi_opf |= REQ_INTEGRITY;
1167         }
1168         bio->bi_end_io = dio->orig_bi_end_io;
1169
1170         if (dio->completion)
1171                 complete(dio->completion);
1172
1173         dec_in_flight(dio);
1174 }
1175
1176 static void integrity_sector_checksum(struct dm_integrity_c *ic, sector_t sector,
1177                                       const char *data, char *result)
1178 {
1179         __u64 sector_le = cpu_to_le64(sector);
1180         SHASH_DESC_ON_STACK(req, ic->internal_hash);
1181         int r;
1182         unsigned digest_size;
1183
1184         req->tfm = ic->internal_hash;
1185         req->flags = 0;
1186
1187         r = crypto_shash_init(req);
1188         if (unlikely(r < 0)) {
1189                 dm_integrity_io_error(ic, "crypto_shash_init", r);
1190                 goto failed;
1191         }
1192
1193         r = crypto_shash_update(req, (const __u8 *)&sector_le, sizeof sector_le);
1194         if (unlikely(r < 0)) {
1195                 dm_integrity_io_error(ic, "crypto_shash_update", r);
1196                 goto failed;
1197         }
1198
1199         r = crypto_shash_update(req, data, ic->sectors_per_block << SECTOR_SHIFT);
1200         if (unlikely(r < 0)) {
1201                 dm_integrity_io_error(ic, "crypto_shash_update", r);
1202                 goto failed;
1203         }
1204
1205         r = crypto_shash_final(req, result);
1206         if (unlikely(r < 0)) {
1207                 dm_integrity_io_error(ic, "crypto_shash_final", r);
1208                 goto failed;
1209         }
1210
1211         digest_size = crypto_shash_digestsize(ic->internal_hash);
1212         if (unlikely(digest_size < ic->tag_size))
1213                 memset(result + digest_size, 0, ic->tag_size - digest_size);
1214
1215         return;
1216
1217 failed:
1218         /* this shouldn't happen anyway, the hash functions have no reason to fail */
1219         get_random_bytes(result, ic->tag_size);
1220 }
1221
1222 static void integrity_metadata(struct work_struct *w)
1223 {
1224         struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
1225         struct dm_integrity_c *ic = dio->ic;
1226
1227         int r;
1228
1229         if (ic->internal_hash) {
1230                 struct bvec_iter iter;
1231                 struct bio_vec bv;
1232                 unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1233                 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1234                 char *checksums;
1235                 unsigned extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0;
1236                 char checksums_onstack[ic->tag_size + extra_space];
1237                 unsigned sectors_to_process = dio->range.n_sectors;
1238                 sector_t sector = dio->range.logical_sector;
1239
1240                 if (unlikely(ic->mode == 'R'))
1241                         goto skip_io;
1242
1243                 checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT >> ic->sb->log2_sectors_per_block) * ic->tag_size + extra_space,
1244                                     GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
1245                 if (!checksums)
1246                         checksums = checksums_onstack;
1247
1248                 __bio_for_each_segment(bv, bio, iter, dio->orig_bi_iter) {
1249                         unsigned pos;
1250                         char *mem, *checksums_ptr;
1251
1252 again:
1253                         mem = (char *)kmap_atomic(bv.bv_page) + bv.bv_offset;
1254                         pos = 0;
1255                         checksums_ptr = checksums;
1256                         do {
1257                                 integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr);
1258                                 checksums_ptr += ic->tag_size;
1259                                 sectors_to_process -= ic->sectors_per_block;
1260                                 pos += ic->sectors_per_block << SECTOR_SHIFT;
1261                                 sector += ic->sectors_per_block;
1262                         } while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
1263                         kunmap_atomic(mem);
1264
1265                         r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1266                                                 checksums_ptr - checksums, !dio->write ? TAG_CMP : TAG_WRITE);
1267                         if (unlikely(r)) {
1268                                 if (r > 0) {
1269                                         DMERR("Checksum failed at sector 0x%llx",
1270                                               (unsigned long long)(sector - ((r + ic->tag_size - 1) / ic->tag_size)));
1271                                         r = -EILSEQ;
1272                                 }
1273                                 if (likely(checksums != checksums_onstack))
1274                                         kfree(checksums);
1275                                 goto error;
1276                         }
1277
1278                         if (!sectors_to_process)
1279                                 break;
1280
1281                         if (unlikely(pos < bv.bv_len)) {
1282                                 bv.bv_offset += pos;
1283                                 bv.bv_len -= pos;
1284                                 goto again;
1285                         }
1286                 }
1287
1288                 if (likely(checksums != checksums_onstack))
1289                         kfree(checksums);
1290         } else {
1291                 struct bio_integrity_payload *bip = dio->orig_bi_integrity;
1292
1293                 if (bip) {
1294                         struct bio_vec biv;
1295                         struct bvec_iter iter;
1296                         unsigned data_to_process = dio->range.n_sectors;
1297                         sector_to_block(ic, data_to_process);
1298                         data_to_process *= ic->tag_size;
1299
1300                         bip_for_each_vec(biv, bip, iter) {
1301                                 unsigned char *tag;
1302                                 unsigned this_len;
1303
1304                                 BUG_ON(PageHighMem(biv.bv_page));
1305                                 tag = lowmem_page_address(biv.bv_page) + biv.bv_offset;
1306                                 this_len = min(biv.bv_len, data_to_process);
1307                                 r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset,
1308                                                         this_len, !dio->write ? TAG_READ : TAG_WRITE);
1309                                 if (unlikely(r))
1310                                         goto error;
1311                                 data_to_process -= this_len;
1312                                 if (!data_to_process)
1313                                         break;
1314                         }
1315                 }
1316         }
1317 skip_io:
1318         dec_in_flight(dio);
1319         return;
1320 error:
1321         dio->bi_error = r;
1322         dec_in_flight(dio);
1323 }
1324
1325 static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
1326 {
1327         struct dm_integrity_c *ic = ti->private;
1328         struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1329         struct bio_integrity_payload *bip;
1330
1331         sector_t area, offset;
1332
1333         dio->ic = ic;
1334         dio->bi_error = 0;
1335
1336         if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
1337                 submit_flush_bio(ic, dio);
1338                 return DM_MAPIO_SUBMITTED;
1339         }
1340
1341         dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector);
1342         dio->write = bio_op(bio) == REQ_OP_WRITE;
1343         dio->fua = dio->write && bio->bi_opf & REQ_FUA;
1344         if (unlikely(dio->fua)) {
1345                 /*
1346                  * Don't pass down the FUA flag because we have to flush
1347                  * disk cache anyway.
1348                  */
1349                 bio->bi_opf &= ~REQ_FUA;
1350         }
1351         if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) {
1352                 DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx",
1353                       (unsigned long long)dio->range.logical_sector, bio_sectors(bio),
1354                       (unsigned long long)ic->provided_data_sectors);
1355                 return -EIO;
1356         }
1357         if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned)(ic->sectors_per_block - 1))) {
1358                 DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x",
1359                       ic->sectors_per_block,
1360                       (unsigned long long)dio->range.logical_sector, bio_sectors(bio));
1361                 return -EIO;
1362         }
1363
1364         if (ic->sectors_per_block > 1) {
1365                 struct bvec_iter iter;
1366                 struct bio_vec bv;
1367                 bio_for_each_segment(bv, bio, iter) {
1368                         if (unlikely((bv.bv_offset | bv.bv_len) & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
1369                                 DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
1370                                         bv.bv_offset, bv.bv_len, ic->sectors_per_block);
1371                                 return -EIO;
1372                         }
1373                 }
1374         }
1375
1376         bip = bio_integrity(bio);
1377         if (!ic->internal_hash) {
1378                 if (bip) {
1379                         unsigned wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block;
1380                         if (ic->log2_tag_size >= 0)
1381                                 wanted_tag_size <<= ic->log2_tag_size;
1382                         else
1383                                 wanted_tag_size *= ic->tag_size;
1384                         if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) {
1385                                 DMERR("Invalid integrity data size %u, expected %u", bip->bip_iter.bi_size, wanted_tag_size);
1386                                 return -EIO;
1387                         }
1388                 }
1389         } else {
1390                 if (unlikely(bip != NULL)) {
1391                         DMERR("Unexpected integrity data when using internal hash");
1392                         return -EIO;
1393                 }
1394         }
1395
1396         if (unlikely(ic->mode == 'R') && unlikely(dio->write))
1397                 return -EIO;
1398
1399         get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1400         dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1401         bio->bi_iter.bi_sector = get_data_sector(ic, area, offset);
1402
1403         dm_integrity_map_continue(dio, true);
1404         return DM_MAPIO_SUBMITTED;
1405 }
1406
1407 static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
1408                                  unsigned journal_section, unsigned journal_entry)
1409 {
1410         struct dm_integrity_c *ic = dio->ic;
1411         sector_t logical_sector;
1412         unsigned n_sectors;
1413
1414         logical_sector = dio->range.logical_sector;
1415         n_sectors = dio->range.n_sectors;
1416         do {
1417                 struct bio_vec bv = bio_iovec(bio);
1418                 char *mem;
1419
1420                 if (unlikely(bv.bv_len >> SECTOR_SHIFT > n_sectors))
1421                         bv.bv_len = n_sectors << SECTOR_SHIFT;
1422                 n_sectors -= bv.bv_len >> SECTOR_SHIFT;
1423                 bio_advance_iter(bio, &bio->bi_iter, bv.bv_len);
1424 retry_kmap:
1425                 mem = kmap_atomic(bv.bv_page);
1426                 if (likely(dio->write))
1427                         flush_dcache_page(bv.bv_page);
1428
1429                 do {
1430                         struct journal_entry *je = access_journal_entry(ic, journal_section, journal_entry);
1431
1432                         if (unlikely(!dio->write)) {
1433                                 struct journal_sector *js;
1434                                 char *mem_ptr;
1435                                 unsigned s;
1436
1437                                 if (unlikely(journal_entry_is_inprogress(je))) {
1438                                         flush_dcache_page(bv.bv_page);
1439                                         kunmap_atomic(mem);
1440
1441                                         __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
1442                                         goto retry_kmap;
1443                                 }
1444                                 smp_rmb();
1445                                 BUG_ON(journal_entry_get_sector(je) != logical_sector);
1446                                 js = access_journal_data(ic, journal_section, journal_entry);
1447                                 mem_ptr = mem + bv.bv_offset;
1448                                 s = 0;
1449                                 do {
1450                                         memcpy(mem_ptr, js, JOURNAL_SECTOR_DATA);
1451                                         *(commit_id_t *)(mem_ptr + JOURNAL_SECTOR_DATA) = je->last_bytes[s];
1452                                         js++;
1453                                         mem_ptr += 1 << SECTOR_SHIFT;
1454                                 } while (++s < ic->sectors_per_block);
1455 #ifdef INTERNAL_VERIFY
1456                                 if (ic->internal_hash) {
1457                                         char checksums_onstack[max(crypto_shash_digestsize(ic->internal_hash), ic->tag_size)];
1458
1459                                         integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack);
1460                                         if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) {
1461                                                 DMERR("Checksum failed when reading from journal, at sector 0x%llx",
1462                                                       (unsigned long long)logical_sector);
1463                                         }
1464                                 }
1465 #endif
1466                         }
1467
1468                         if (!ic->internal_hash) {
1469                                 struct bio_integrity_payload *bip = bio_integrity(bio);
1470                                 unsigned tag_todo = ic->tag_size;
1471                                 char *tag_ptr = journal_entry_tag(ic, je);
1472
1473                                 if (bip) do {
1474                                         struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
1475                                         unsigned tag_now = min(biv.bv_len, tag_todo);
1476                                         char *tag_addr;
1477                                         BUG_ON(PageHighMem(biv.bv_page));
1478                                         tag_addr = lowmem_page_address(biv.bv_page) + biv.bv_offset;
1479                                         if (likely(dio->write))
1480                                                 memcpy(tag_ptr, tag_addr, tag_now);
1481                                         else
1482                                                 memcpy(tag_addr, tag_ptr, tag_now);
1483                                         bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now);
1484                                         tag_ptr += tag_now;
1485                                         tag_todo -= tag_now;
1486                                 } while (unlikely(tag_todo)); else {
1487                                         if (likely(dio->write))
1488                                                 memset(tag_ptr, 0, tag_todo);
1489                                 }
1490                         }
1491
1492                         if (likely(dio->write)) {
1493                                 struct journal_sector *js;
1494                                 unsigned s;
1495
1496                                 js = access_journal_data(ic, journal_section, journal_entry);
1497                                 memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT);
1498
1499                                 s = 0;
1500                                 do {
1501                                         je->last_bytes[s] = js[s].commit_id;
1502                                 } while (++s < ic->sectors_per_block);
1503
1504                                 if (ic->internal_hash) {
1505                                         unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1506                                         if (unlikely(digest_size > ic->tag_size)) {
1507                                                 char checksums_onstack[digest_size];
1508                                                 integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack);
1509                                                 memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size);
1510                                         } else
1511                                                 integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je));
1512                                 }
1513
1514                                 journal_entry_set_sector(je, logical_sector);
1515                         }
1516                         logical_sector += ic->sectors_per_block;
1517
1518                         journal_entry++;
1519                         if (unlikely(journal_entry == ic->journal_section_entries)) {
1520                                 journal_entry = 0;
1521                                 journal_section++;
1522                                 wraparound_section(ic, &journal_section);
1523                         }
1524
1525                         bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT;
1526                 } while (bv.bv_len -= ic->sectors_per_block << SECTOR_SHIFT);
1527
1528                 if (unlikely(!dio->write))
1529                         flush_dcache_page(bv.bv_page);
1530                 kunmap_atomic(mem);
1531         } while (n_sectors);
1532
1533         if (likely(dio->write)) {
1534                 smp_mb();
1535                 if (unlikely(waitqueue_active(&ic->copy_to_journal_wait)))
1536                         wake_up(&ic->copy_to_journal_wait);
1537                 if (ACCESS_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) {
1538                         queue_work(ic->commit_wq, &ic->commit_work);
1539                 } else {
1540                         schedule_autocommit(ic);
1541                 }
1542         } else {
1543                 remove_range(ic, &dio->range);
1544         }
1545
1546         if (unlikely(bio->bi_iter.bi_size)) {
1547                 sector_t area, offset;
1548
1549                 dio->range.logical_sector = logical_sector;
1550                 get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1551                 dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1552                 return true;
1553         }
1554
1555         return false;
1556 }
1557
1558 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map)
1559 {
1560         struct dm_integrity_c *ic = dio->ic;
1561         struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1562         unsigned journal_section, journal_entry;
1563         unsigned journal_read_pos;
1564         struct completion read_comp;
1565         bool need_sync_io = ic->internal_hash && !dio->write;
1566
1567         if (need_sync_io && from_map) {
1568                 INIT_WORK(&dio->work, integrity_bio_wait);
1569                 queue_work(ic->metadata_wq, &dio->work);
1570                 return;
1571         }
1572
1573 lock_retry:
1574         spin_lock_irq(&ic->endio_wait.lock);
1575 retry:
1576         if (unlikely(dm_integrity_failed(ic))) {
1577                 spin_unlock_irq(&ic->endio_wait.lock);
1578                 do_endio(ic, bio);
1579                 return;
1580         }
1581         dio->range.n_sectors = bio_sectors(bio);
1582         journal_read_pos = NOT_FOUND;
1583         if (likely(ic->mode == 'J')) {
1584                 if (dio->write) {
1585                         unsigned next_entry, i, pos;
1586                         unsigned ws, we;
1587
1588                         dio->range.n_sectors = min(dio->range.n_sectors, ic->free_sectors);
1589                         if (unlikely(!dio->range.n_sectors))
1590                                 goto sleep;
1591                         ic->free_sectors -= dio->range.n_sectors;
1592                         journal_section = ic->free_section;
1593                         journal_entry = ic->free_section_entry;
1594
1595                         next_entry = ic->free_section_entry + dio->range.n_sectors;
1596                         ic->free_section_entry = next_entry % ic->journal_section_entries;
1597                         ic->free_section += next_entry / ic->journal_section_entries;
1598                         ic->n_uncommitted_sections += next_entry / ic->journal_section_entries;
1599                         wraparound_section(ic, &ic->free_section);
1600
1601                         pos = journal_section * ic->journal_section_entries + journal_entry;
1602                         ws = journal_section;
1603                         we = journal_entry;
1604                         i = 0;
1605                         do {
1606                                 struct journal_entry *je;
1607
1608                                 add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i);
1609                                 pos++;
1610                                 if (unlikely(pos >= ic->journal_entries))
1611                                         pos = 0;
1612
1613                                 je = access_journal_entry(ic, ws, we);
1614                                 BUG_ON(!journal_entry_is_unused(je));
1615                                 journal_entry_set_inprogress(je);
1616                                 we++;
1617                                 if (unlikely(we == ic->journal_section_entries)) {
1618                                         we = 0;
1619                                         ws++;
1620                                         wraparound_section(ic, &ws);
1621                                 }
1622                         } while ((i += ic->sectors_per_block) < dio->range.n_sectors);
1623
1624                         spin_unlock_irq(&ic->endio_wait.lock);
1625                         goto journal_read_write;
1626                 } else {
1627                         sector_t next_sector;
1628                         journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
1629                         if (likely(journal_read_pos == NOT_FOUND)) {
1630                                 if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector))
1631                                         dio->range.n_sectors = next_sector - dio->range.logical_sector;
1632                         } else {
1633                                 unsigned i;
1634                                 unsigned jp = journal_read_pos + 1;
1635                                 for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) {
1636                                         if (!test_journal_node(ic, jp, dio->range.logical_sector + i))
1637                                                 break;
1638                                 }
1639                                 dio->range.n_sectors = i;
1640                         }
1641                 }
1642         }
1643         if (unlikely(!add_new_range(ic, &dio->range))) {
1644                 /*
1645                  * We must not sleep in the request routine because it could
1646                  * stall bios on current->bio_list.
1647                  * So, we offload the bio to a workqueue if we have to sleep.
1648                  */
1649 sleep:
1650                 if (from_map) {
1651                         spin_unlock_irq(&ic->endio_wait.lock);
1652                         INIT_WORK(&dio->work, integrity_bio_wait);
1653                         queue_work(ic->wait_wq, &dio->work);
1654                         return;
1655                 } else {
1656                         sleep_on_endio_wait(ic);
1657                         goto retry;
1658                 }
1659         }
1660         spin_unlock_irq(&ic->endio_wait.lock);
1661
1662         if (unlikely(journal_read_pos != NOT_FOUND)) {
1663                 journal_section = journal_read_pos / ic->journal_section_entries;
1664                 journal_entry = journal_read_pos % ic->journal_section_entries;
1665                 goto journal_read_write;
1666         }
1667
1668         dio->in_flight = (atomic_t)ATOMIC_INIT(2);
1669
1670         if (need_sync_io) {
1671                 read_comp = COMPLETION_INITIALIZER_ONSTACK(read_comp);
1672                 dio->completion = &read_comp;
1673         } else
1674                 dio->completion = NULL;
1675
1676         dio->orig_bi_iter = bio->bi_iter;
1677
1678         dio->orig_bi_bdev = bio->bi_bdev;
1679         bio->bi_bdev = ic->dev->bdev;
1680
1681         dio->orig_bi_integrity = bio_integrity(bio);
1682         bio->bi_integrity = NULL;
1683         bio->bi_opf &= ~REQ_INTEGRITY;
1684
1685         dio->orig_bi_end_io = bio->bi_end_io;
1686         bio->bi_end_io = integrity_end_io;
1687
1688         bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT;
1689         bio->bi_iter.bi_sector += ic->start;
1690         generic_make_request(bio);
1691
1692         if (need_sync_io) {
1693                 wait_for_completion_io(&read_comp);
1694                 integrity_metadata(&dio->work);
1695         } else {
1696                 INIT_WORK(&dio->work, integrity_metadata);
1697                 queue_work(ic->metadata_wq, &dio->work);
1698         }
1699
1700         return;
1701
1702 journal_read_write:
1703         if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry)))
1704                 goto lock_retry;
1705
1706         do_endio_flush(ic, dio);
1707 }
1708
1709
1710 static void integrity_bio_wait(struct work_struct *w)
1711 {
1712         struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
1713
1714         dm_integrity_map_continue(dio, false);
1715 }
1716
1717 static void pad_uncommitted(struct dm_integrity_c *ic)
1718 {
1719         if (ic->free_section_entry) {
1720                 ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry;
1721                 ic->free_section_entry = 0;
1722                 ic->free_section++;
1723                 wraparound_section(ic, &ic->free_section);
1724                 ic->n_uncommitted_sections++;
1725         }
1726 }
1727
1728 static void integrity_commit(struct work_struct *w)
1729 {
1730         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work);
1731         unsigned commit_start, commit_sections;
1732         unsigned i, j, n;
1733         struct bio *flushes;
1734
1735         del_timer(&ic->autocommit_timer);
1736
1737         spin_lock_irq(&ic->endio_wait.lock);
1738         flushes = bio_list_get(&ic->flush_bio_list);
1739         if (unlikely(ic->mode != 'J')) {
1740                 spin_unlock_irq(&ic->endio_wait.lock);
1741                 dm_integrity_flush_buffers(ic);
1742                 goto release_flush_bios;
1743         }
1744
1745         pad_uncommitted(ic);
1746         commit_start = ic->uncommitted_section;
1747         commit_sections = ic->n_uncommitted_sections;
1748         spin_unlock_irq(&ic->endio_wait.lock);
1749
1750         if (!commit_sections)
1751                 goto release_flush_bios;
1752
1753         i = commit_start;
1754         for (n = 0; n < commit_sections; n++) {
1755                 for (j = 0; j < ic->journal_section_entries; j++) {
1756                         struct journal_entry *je;
1757                         je = access_journal_entry(ic, i, j);
1758                         io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
1759                 }
1760                 for (j = 0; j < ic->journal_section_sectors; j++) {
1761                         struct journal_sector *js;
1762                         js = access_journal(ic, i, j);
1763                         js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq);
1764                 }
1765                 i++;
1766                 if (unlikely(i >= ic->journal_sections))
1767                         ic->commit_seq = next_commit_seq(ic->commit_seq);
1768                 wraparound_section(ic, &i);
1769         }
1770         smp_rmb();
1771
1772         write_journal(ic, commit_start, commit_sections);
1773
1774         spin_lock_irq(&ic->endio_wait.lock);
1775         ic->uncommitted_section += commit_sections;
1776         wraparound_section(ic, &ic->uncommitted_section);
1777         ic->n_uncommitted_sections -= commit_sections;
1778         ic->n_committed_sections += commit_sections;
1779         spin_unlock_irq(&ic->endio_wait.lock);
1780
1781         if (ACCESS_ONCE(ic->free_sectors) <= ic->free_sectors_threshold)
1782                 queue_work(ic->writer_wq, &ic->writer_work);
1783
1784 release_flush_bios:
1785         while (flushes) {
1786                 struct bio *next = flushes->bi_next;
1787                 flushes->bi_next = NULL;
1788                 do_endio(ic, flushes);
1789                 flushes = next;
1790         }
1791 }
1792
1793 static void complete_copy_from_journal(unsigned long error, void *context)
1794 {
1795         struct journal_io *io = context;
1796         struct journal_completion *comp = io->comp;
1797         struct dm_integrity_c *ic = comp->ic;
1798         remove_range(ic, &io->range);
1799         mempool_free(io, ic->journal_io_mempool);
1800         if (unlikely(error != 0))
1801                 dm_integrity_io_error(ic, "copying from journal", -EIO);
1802         complete_journal_op(comp);
1803 }
1804
1805 static void restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js,
1806                                struct journal_entry *je)
1807 {
1808         unsigned s = 0;
1809         do {
1810                 js->commit_id = je->last_bytes[s];
1811                 js++;
1812         } while (++s < ic->sectors_per_block);
1813 }
1814
1815 static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start,
1816                              unsigned write_sections, bool from_replay)
1817 {
1818         unsigned i, j, n;
1819         struct journal_completion comp;
1820
1821         comp.ic = ic;
1822         comp.in_flight = (atomic_t)ATOMIC_INIT(1);
1823         comp.comp = COMPLETION_INITIALIZER_ONSTACK(comp.comp);
1824
1825         i = write_start;
1826         for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) {
1827 #ifndef INTERNAL_VERIFY
1828                 if (unlikely(from_replay))
1829 #endif
1830                         rw_section_mac(ic, i, false);
1831                 for (j = 0; j < ic->journal_section_entries; j++) {
1832                         struct journal_entry *je = access_journal_entry(ic, i, j);
1833                         sector_t sec, area, offset;
1834                         unsigned k, l, next_loop;
1835                         sector_t metadata_block;
1836                         unsigned metadata_offset;
1837                         struct journal_io *io;
1838
1839                         if (journal_entry_is_unused(je))
1840                                 continue;
1841                         BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay);
1842                         sec = journal_entry_get_sector(je);
1843                         if (unlikely(from_replay)) {
1844                                 if (unlikely(sec & (unsigned)(ic->sectors_per_block - 1))) {
1845                                         dm_integrity_io_error(ic, "invalid sector in journal", -EIO);
1846                                         sec &= ~(sector_t)(ic->sectors_per_block - 1);
1847                                 }
1848                         }
1849                         get_area_and_offset(ic, sec, &area, &offset);
1850                         restore_last_bytes(ic, access_journal_data(ic, i, j), je);
1851                         for (k = j + 1; k < ic->journal_section_entries; k++) {
1852                                 struct journal_entry *je2 = access_journal_entry(ic, i, k);
1853                                 sector_t sec2, area2, offset2;
1854                                 if (journal_entry_is_unused(je2))
1855                                         break;
1856                                 BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay);
1857                                 sec2 = journal_entry_get_sector(je2);
1858                                 get_area_and_offset(ic, sec2, &area2, &offset2);
1859                                 if (area2 != area || offset2 != offset + ((k - j) << ic->sb->log2_sectors_per_block))
1860                                         break;
1861                                 restore_last_bytes(ic, access_journal_data(ic, i, k), je2);
1862                         }
1863                         next_loop = k - 1;
1864
1865                         io = mempool_alloc(ic->journal_io_mempool, GFP_NOIO);
1866                         io->comp = &comp;
1867                         io->range.logical_sector = sec;
1868                         io->range.n_sectors = (k - j) << ic->sb->log2_sectors_per_block;
1869
1870                         spin_lock_irq(&ic->endio_wait.lock);
1871                         while (unlikely(!add_new_range(ic, &io->range)))
1872                                 sleep_on_endio_wait(ic);
1873
1874                         if (likely(!from_replay)) {
1875                                 struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries];
1876
1877                                 /* don't write if there is newer committed sector */
1878                                 while (j < k && find_newer_committed_node(ic, &section_node[j])) {
1879                                         struct journal_entry *je2 = access_journal_entry(ic, i, j);
1880
1881                                         journal_entry_set_unused(je2);
1882                                         remove_journal_node(ic, &section_node[j]);
1883                                         j++;
1884                                         sec += ic->sectors_per_block;
1885                                         offset += ic->sectors_per_block;
1886                                 }
1887                                 while (j < k && find_newer_committed_node(ic, &section_node[k - 1])) {
1888                                         struct journal_entry *je2 = access_journal_entry(ic, i, k - 1);
1889
1890                                         journal_entry_set_unused(je2);
1891                                         remove_journal_node(ic, &section_node[k - 1]);
1892                                         k--;
1893                                 }
1894                                 if (j == k) {
1895                                         remove_range_unlocked(ic, &io->range);
1896                                         spin_unlock_irq(&ic->endio_wait.lock);
1897                                         mempool_free(io, ic->journal_io_mempool);
1898                                         goto skip_io;
1899                                 }
1900                                 for (l = j; l < k; l++) {
1901                                         remove_journal_node(ic, &section_node[l]);
1902                                 }
1903                         }
1904                         spin_unlock_irq(&ic->endio_wait.lock);
1905
1906                         metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
1907                         for (l = j; l < k; l++) {
1908                                 int r;
1909                                 struct journal_entry *je2 = access_journal_entry(ic, i, l);
1910
1911                                 if (
1912 #ifndef INTERNAL_VERIFY
1913                                     unlikely(from_replay) &&
1914 #endif
1915                                     ic->internal_hash) {
1916                                         char test_tag[max(crypto_shash_digestsize(ic->internal_hash), ic->tag_size)];
1917
1918                                         integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block),
1919                                                                   (char *)access_journal_data(ic, i, l), test_tag);
1920                                         if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size)))
1921                                                 dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ);
1922                                 }
1923
1924                                 journal_entry_set_unused(je2);
1925                                 r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset,
1926                                                         ic->tag_size, TAG_WRITE);
1927                                 if (unlikely(r)) {
1928                                         dm_integrity_io_error(ic, "reading tags", r);
1929                                 }
1930                         }
1931
1932                         atomic_inc(&comp.in_flight);
1933                         copy_from_journal(ic, i, j << ic->sb->log2_sectors_per_block,
1934                                           (k - j) << ic->sb->log2_sectors_per_block,
1935                                           get_data_sector(ic, area, offset),
1936                                           complete_copy_from_journal, io);
1937 skip_io:
1938                         j = next_loop;
1939                 }
1940         }
1941
1942         dm_bufio_write_dirty_buffers_async(ic->bufio);
1943
1944         complete_journal_op(&comp);
1945         wait_for_completion_io(&comp.comp);
1946
1947         dm_integrity_flush_buffers(ic);
1948 }
1949
1950 static void integrity_writer(struct work_struct *w)
1951 {
1952         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work);
1953         unsigned write_start, write_sections;
1954
1955         unsigned prev_free_sectors;
1956
1957         /* the following test is not needed, but it tests the replay code */
1958         if (ACCESS_ONCE(ic->suspending))
1959                 return;
1960
1961         spin_lock_irq(&ic->endio_wait.lock);
1962         write_start = ic->committed_section;
1963         write_sections = ic->n_committed_sections;
1964         spin_unlock_irq(&ic->endio_wait.lock);
1965
1966         if (!write_sections)
1967                 return;
1968
1969         do_journal_write(ic, write_start, write_sections, false);
1970
1971         spin_lock_irq(&ic->endio_wait.lock);
1972
1973         ic->committed_section += write_sections;
1974         wraparound_section(ic, &ic->committed_section);
1975         ic->n_committed_sections -= write_sections;
1976
1977         prev_free_sectors = ic->free_sectors;
1978         ic->free_sectors += write_sections * ic->journal_section_entries;
1979         if (unlikely(!prev_free_sectors))
1980                 wake_up_locked(&ic->endio_wait);
1981
1982         spin_unlock_irq(&ic->endio_wait.lock);
1983 }
1984
1985 static void init_journal(struct dm_integrity_c *ic, unsigned start_section,
1986                          unsigned n_sections, unsigned char commit_seq)
1987 {
1988         unsigned i, j, n;
1989
1990         if (!n_sections)
1991                 return;
1992
1993         for (n = 0; n < n_sections; n++) {
1994                 i = start_section + n;
1995                 wraparound_section(ic, &i);
1996                 for (j = 0; j < ic->journal_section_sectors; j++) {
1997                         struct journal_sector *js = access_journal(ic, i, j);
1998                         memset(&js->entries, 0, JOURNAL_SECTOR_DATA);
1999                         js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq);
2000                 }
2001                 for (j = 0; j < ic->journal_section_entries; j++) {
2002                         struct journal_entry *je = access_journal_entry(ic, i, j);
2003                         journal_entry_set_unused(je);
2004                 }
2005         }
2006
2007         write_journal(ic, start_section, n_sections);
2008 }
2009
2010 static int find_commit_seq(struct dm_integrity_c *ic, unsigned i, unsigned j, commit_id_t id)
2011 {
2012         unsigned char k;
2013         for (k = 0; k < N_COMMIT_IDS; k++) {
2014                 if (dm_integrity_commit_id(ic, i, j, k) == id)
2015                         return k;
2016         }
2017         dm_integrity_io_error(ic, "journal commit id", -EIO);
2018         return -EIO;
2019 }
2020
2021 static void replay_journal(struct dm_integrity_c *ic)
2022 {
2023         unsigned i, j;
2024         bool used_commit_ids[N_COMMIT_IDS];
2025         unsigned max_commit_id_sections[N_COMMIT_IDS];
2026         unsigned write_start, write_sections;
2027         unsigned continue_section;
2028         bool journal_empty;
2029         unsigned char unused, last_used, want_commit_seq;
2030
2031         if (ic->mode == 'R')
2032                 return;
2033
2034         if (ic->journal_uptodate)
2035                 return;
2036
2037         last_used = 0;
2038         write_start = 0;
2039
2040         if (!ic->just_formatted) {
2041                 DEBUG_print("reading journal\n");
2042                 rw_journal(ic, REQ_OP_READ, 0, 0, ic->journal_sections, NULL);
2043                 if (ic->journal_io)
2044                         DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal");
2045                 if (ic->journal_io) {
2046                         struct journal_completion crypt_comp;
2047                         crypt_comp.ic = ic;
2048                         crypt_comp.comp = COMPLETION_INITIALIZER_ONSTACK(crypt_comp.comp);
2049                         crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0);
2050                         encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp);
2051                         wait_for_completion(&crypt_comp.comp);
2052                 }
2053                 DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal");
2054         }
2055
2056         if (dm_integrity_failed(ic))
2057                 goto clear_journal;
2058
2059         journal_empty = true;
2060         memset(used_commit_ids, 0, sizeof used_commit_ids);
2061         memset(max_commit_id_sections, 0, sizeof max_commit_id_sections);
2062         for (i = 0; i < ic->journal_sections; i++) {
2063                 for (j = 0; j < ic->journal_section_sectors; j++) {
2064                         int k;
2065                         struct journal_sector *js = access_journal(ic, i, j);
2066                         k = find_commit_seq(ic, i, j, js->commit_id);
2067                         if (k < 0)
2068                                 goto clear_journal;
2069                         used_commit_ids[k] = true;
2070                         max_commit_id_sections[k] = i;
2071                 }
2072                 if (journal_empty) {
2073                         for (j = 0; j < ic->journal_section_entries; j++) {
2074                                 struct journal_entry *je = access_journal_entry(ic, i, j);
2075                                 if (!journal_entry_is_unused(je)) {
2076                                         journal_empty = false;
2077                                         break;
2078                                 }
2079                         }
2080                 }
2081         }
2082
2083         if (!used_commit_ids[N_COMMIT_IDS - 1]) {
2084                 unused = N_COMMIT_IDS - 1;
2085                 while (unused && !used_commit_ids[unused - 1])
2086                         unused--;
2087         } else {
2088                 for (unused = 0; unused < N_COMMIT_IDS; unused++)
2089                         if (!used_commit_ids[unused])
2090                                 break;
2091                 if (unused == N_COMMIT_IDS) {
2092                         dm_integrity_io_error(ic, "journal commit ids", -EIO);
2093                         goto clear_journal;
2094                 }
2095         }
2096         DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n",
2097                     unused, used_commit_ids[0], used_commit_ids[1],
2098                     used_commit_ids[2], used_commit_ids[3]);
2099
2100         last_used = prev_commit_seq(unused);
2101         want_commit_seq = prev_commit_seq(last_used);
2102
2103         if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)])
2104                 journal_empty = true;
2105
2106         write_start = max_commit_id_sections[last_used] + 1;
2107         if (unlikely(write_start >= ic->journal_sections))
2108                 want_commit_seq = next_commit_seq(want_commit_seq);
2109         wraparound_section(ic, &write_start);
2110
2111         i = write_start;
2112         for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) {
2113                 for (j = 0; j < ic->journal_section_sectors; j++) {
2114                         struct journal_sector *js = access_journal(ic, i, j);
2115
2116                         if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) {
2117                                 /*
2118                                  * This could be caused by crash during writing.
2119                                  * We won't replay the inconsistent part of the
2120                                  * journal.
2121                                  */
2122                                 DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n",
2123                                             i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq);
2124                                 goto brk;
2125                         }
2126                 }
2127                 i++;
2128                 if (unlikely(i >= ic->journal_sections))
2129                         want_commit_seq = next_commit_seq(want_commit_seq);
2130                 wraparound_section(ic, &i);
2131         }
2132 brk:
2133
2134         if (!journal_empty) {
2135                 DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n",
2136                             write_sections, write_start, want_commit_seq);
2137                 do_journal_write(ic, write_start, write_sections, true);
2138         }
2139
2140         if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) {
2141                 continue_section = write_start;
2142                 ic->commit_seq = want_commit_seq;
2143                 DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq);
2144         } else {
2145                 unsigned s;
2146                 unsigned char erase_seq;
2147 clear_journal:
2148                 DEBUG_print("clearing journal\n");
2149
2150                 erase_seq = prev_commit_seq(prev_commit_seq(last_used));
2151                 s = write_start;
2152                 init_journal(ic, s, 1, erase_seq);
2153                 s++;
2154                 wraparound_section(ic, &s);
2155                 if (ic->journal_sections >= 2) {
2156                         init_journal(ic, s, ic->journal_sections - 2, erase_seq);
2157                         s += ic->journal_sections - 2;
2158                         wraparound_section(ic, &s);
2159                         init_journal(ic, s, 1, erase_seq);
2160                 }
2161
2162                 continue_section = 0;
2163                 ic->commit_seq = next_commit_seq(erase_seq);
2164         }
2165
2166         ic->committed_section = continue_section;
2167         ic->n_committed_sections = 0;
2168
2169         ic->uncommitted_section = continue_section;
2170         ic->n_uncommitted_sections = 0;
2171
2172         ic->free_section = continue_section;
2173         ic->free_section_entry = 0;
2174         ic->free_sectors = ic->journal_entries;
2175
2176         ic->journal_tree_root = RB_ROOT;
2177         for (i = 0; i < ic->journal_entries; i++)
2178                 init_journal_node(&ic->journal_tree[i]);
2179 }
2180
2181 static void dm_integrity_postsuspend(struct dm_target *ti)
2182 {
2183         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2184
2185         del_timer_sync(&ic->autocommit_timer);
2186
2187         ic->suspending = true;
2188
2189         queue_work(ic->commit_wq, &ic->commit_work);
2190         drain_workqueue(ic->commit_wq);
2191
2192         if (ic->mode == 'J') {
2193                 drain_workqueue(ic->writer_wq);
2194                 dm_integrity_flush_buffers(ic);
2195         }
2196
2197         ic->suspending = false;
2198
2199         BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
2200
2201         ic->journal_uptodate = true;
2202 }
2203
2204 static void dm_integrity_resume(struct dm_target *ti)
2205 {
2206         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2207
2208         replay_journal(ic);
2209 }
2210
2211 static void dm_integrity_status(struct dm_target *ti, status_type_t type,
2212                                 unsigned status_flags, char *result, unsigned maxlen)
2213 {
2214         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2215         unsigned arg_count;
2216         size_t sz = 0;
2217
2218         switch (type) {
2219         case STATUSTYPE_INFO:
2220                 result[0] = '\0';
2221                 break;
2222
2223         case STATUSTYPE_TABLE: {
2224                 __u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100;
2225                 watermark_percentage += ic->journal_entries / 2;
2226                 do_div(watermark_percentage, ic->journal_entries);
2227                 arg_count = 5;
2228                 arg_count += ic->sectors_per_block != 1;
2229                 arg_count += !!ic->internal_hash_alg.alg_string;
2230                 arg_count += !!ic->journal_crypt_alg.alg_string;
2231                 arg_count += !!ic->journal_mac_alg.alg_string;
2232                 DMEMIT("%s %llu %u %c %u", ic->dev->name, (unsigned long long)ic->start,
2233                        ic->tag_size, ic->mode, arg_count);
2234                 DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
2235                 DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors);
2236                 DMEMIT(" buffer_sectors:%u", 1U << ic->log2_buffer_sectors);
2237                 DMEMIT(" journal_watermark:%u", (unsigned)watermark_percentage);
2238                 DMEMIT(" commit_time:%u", ic->autocommit_msec);
2239                 if (ic->sectors_per_block != 1)
2240                         DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
2241
2242 #define EMIT_ALG(a, n)                                                  \
2243                 do {                                                    \
2244                         if (ic->a.alg_string) {                         \
2245                                 DMEMIT(" %s:%s", n, ic->a.alg_string);  \
2246                                 if (ic->a.key_string)                   \
2247                                         DMEMIT(":%s", ic->a.key_string);\
2248                         }                                               \
2249                 } while (0)
2250                 EMIT_ALG(internal_hash_alg, "internal_hash");
2251                 EMIT_ALG(journal_crypt_alg, "journal_crypt");
2252                 EMIT_ALG(journal_mac_alg, "journal_mac");
2253                 break;
2254         }
2255         }
2256 }
2257
2258 static int dm_integrity_iterate_devices(struct dm_target *ti,
2259                                         iterate_devices_callout_fn fn, void *data)
2260 {
2261         struct dm_integrity_c *ic = ti->private;
2262
2263         return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data);
2264 }
2265
2266 static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits)
2267 {
2268         struct dm_integrity_c *ic = ti->private;
2269
2270         if (ic->sectors_per_block > 1) {
2271                 limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
2272                 limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
2273                 blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT);
2274         }
2275 }
2276
2277 static void calculate_journal_section_size(struct dm_integrity_c *ic)
2278 {
2279         unsigned sector_space = JOURNAL_SECTOR_DATA;
2280
2281         ic->journal_sections = le32_to_cpu(ic->sb->journal_sections);
2282         ic->journal_entry_size = roundup(offsetof(struct journal_entry, last_bytes[ic->sectors_per_block]) + ic->tag_size,
2283                                          JOURNAL_ENTRY_ROUNDUP);
2284
2285         if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC))
2286                 sector_space -= JOURNAL_MAC_PER_SECTOR;
2287         ic->journal_entries_per_sector = sector_space / ic->journal_entry_size;
2288         ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS;
2289         ic->journal_section_sectors = (ic->journal_section_entries << ic->sb->log2_sectors_per_block) + JOURNAL_BLOCK_SECTORS;
2290         ic->journal_entries = ic->journal_section_entries * ic->journal_sections;
2291 }
2292
2293 static int calculate_device_limits(struct dm_integrity_c *ic)
2294 {
2295         __u64 initial_sectors;
2296         sector_t last_sector, last_area, last_offset;
2297
2298         calculate_journal_section_size(ic);
2299         initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections;
2300         if (initial_sectors + METADATA_PADDING_SECTORS >= ic->device_sectors || initial_sectors > UINT_MAX)
2301                 return -EINVAL;
2302         ic->initial_sectors = initial_sectors;
2303
2304         ic->metadata_run = roundup((__u64)ic->tag_size << (ic->sb->log2_interleave_sectors - ic->sb->log2_sectors_per_block),
2305                                    (__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS)) >> SECTOR_SHIFT;
2306         if (!(ic->metadata_run & (ic->metadata_run - 1)))
2307                 ic->log2_metadata_run = __ffs(ic->metadata_run);
2308         else
2309                 ic->log2_metadata_run = -1;
2310
2311         get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset);
2312         last_sector = get_data_sector(ic, last_area, last_offset);
2313
2314         if (ic->start + last_sector < last_sector || ic->start + last_sector >= ic->device_sectors)
2315                 return -EINVAL;
2316
2317         return 0;
2318 }
2319
2320 static int initialize_superblock(struct dm_integrity_c *ic, unsigned journal_sectors, unsigned interleave_sectors)
2321 {
2322         unsigned journal_sections;
2323         int test_bit;
2324
2325         memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT);
2326         memcpy(ic->sb->magic, SB_MAGIC, 8);
2327         ic->sb->version = SB_VERSION;
2328         ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size);
2329         ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block);
2330         if (ic->journal_mac_alg.alg_string)
2331                 ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC);
2332
2333         calculate_journal_section_size(ic);
2334         journal_sections = journal_sectors / ic->journal_section_sectors;
2335         if (!journal_sections)
2336                 journal_sections = 1;
2337         ic->sb->journal_sections = cpu_to_le32(journal_sections);
2338
2339         if (!interleave_sectors)
2340                 interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
2341         ic->sb->log2_interleave_sectors = __fls(interleave_sectors);
2342         ic->sb->log2_interleave_sectors = max((__u8)MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
2343         ic->sb->log2_interleave_sectors = min((__u8)MAX_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
2344
2345         ic->provided_data_sectors = 0;
2346         for (test_bit = fls64(ic->device_sectors) - 1; test_bit >= 3; test_bit--) {
2347                 __u64 prev_data_sectors = ic->provided_data_sectors;
2348
2349                 ic->provided_data_sectors |= (sector_t)1 << test_bit;
2350                 if (calculate_device_limits(ic))
2351                         ic->provided_data_sectors = prev_data_sectors;
2352         }
2353
2354         if (!ic->provided_data_sectors)
2355                 return -EINVAL;
2356
2357         ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
2358
2359         return 0;
2360 }
2361
2362 static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic)
2363 {
2364         struct gendisk *disk = dm_disk(dm_table_get_md(ti->table));
2365         struct blk_integrity bi;
2366
2367         memset(&bi, 0, sizeof(bi));
2368         bi.profile = &dm_integrity_profile;
2369         bi.tuple_size = ic->tag_size;
2370         bi.tag_size = bi.tuple_size;
2371         bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT;
2372
2373         blk_integrity_register(disk, &bi);
2374         blk_queue_max_integrity_segments(disk->queue, UINT_MAX);
2375 }
2376
2377 /* FIXME: use new kvmalloc */
2378 static void *dm_integrity_kvmalloc(size_t size, gfp_t gfp)
2379 {
2380         void *ptr = NULL;
2381
2382         if (size <= PAGE_SIZE)
2383                 ptr = kmalloc(size, GFP_KERNEL | gfp);
2384         if (!ptr && size <= KMALLOC_MAX_SIZE)
2385                 ptr = kmalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY | gfp);
2386         if (!ptr)
2387                 ptr = __vmalloc(size, GFP_KERNEL | gfp, PAGE_KERNEL);
2388
2389         return ptr;
2390 }
2391
2392 static void dm_integrity_free_page_list(struct dm_integrity_c *ic, struct page_list *pl)
2393 {
2394         unsigned i;
2395
2396         if (!pl)
2397                 return;
2398         for (i = 0; i < ic->journal_pages; i++)
2399                 if (pl[i].page)
2400                         __free_page(pl[i].page);
2401         kvfree(pl);
2402 }
2403
2404 static struct page_list *dm_integrity_alloc_page_list(struct dm_integrity_c *ic)
2405 {
2406         size_t page_list_desc_size = ic->journal_pages * sizeof(struct page_list);
2407         struct page_list *pl;
2408         unsigned i;
2409
2410         pl = dm_integrity_kvmalloc(page_list_desc_size, __GFP_ZERO);
2411         if (!pl)
2412                 return NULL;
2413
2414         for (i = 0; i < ic->journal_pages; i++) {
2415                 pl[i].page = alloc_page(GFP_KERNEL);
2416                 if (!pl[i].page) {
2417                         dm_integrity_free_page_list(ic, pl);
2418                         return NULL;
2419                 }
2420                 if (i)
2421                         pl[i - 1].next = &pl[i];
2422         }
2423
2424         return pl;
2425 }
2426
2427 static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl)
2428 {
2429         unsigned i;
2430         for (i = 0; i < ic->journal_sections; i++)
2431                 kvfree(sl[i]);
2432         kfree(sl);
2433 }
2434
2435 static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic, struct page_list *pl)
2436 {
2437         struct scatterlist **sl;
2438         unsigned i;
2439
2440         sl = dm_integrity_kvmalloc(ic->journal_sections * sizeof(struct scatterlist *), __GFP_ZERO);
2441         if (!sl)
2442                 return NULL;
2443
2444         for (i = 0; i < ic->journal_sections; i++) {
2445                 struct scatterlist *s;
2446                 unsigned start_index, start_offset;
2447                 unsigned end_index, end_offset;
2448                 unsigned n_pages;
2449                 unsigned idx;
2450
2451                 page_list_location(ic, i, 0, &start_index, &start_offset);
2452                 page_list_location(ic, i, ic->journal_section_sectors - 1, &end_index, &end_offset);
2453
2454                 n_pages = (end_index - start_index + 1);
2455
2456                 s = dm_integrity_kvmalloc(n_pages * sizeof(struct scatterlist), 0);
2457                 if (!s) {
2458                         dm_integrity_free_journal_scatterlist(ic, sl);
2459                         return NULL;
2460                 }
2461
2462                 sg_init_table(s, n_pages);
2463                 for (idx = start_index; idx <= end_index; idx++) {
2464                         char *va = lowmem_page_address(pl[idx].page);
2465                         unsigned start = 0, end = PAGE_SIZE;
2466                         if (idx == start_index)
2467                                 start = start_offset;
2468                         if (idx == end_index)
2469                                 end = end_offset + (1 << SECTOR_SHIFT);
2470                         sg_set_buf(&s[idx - start_index], va + start, end - start);
2471                 }
2472
2473                 sl[i] = s;
2474         }
2475
2476         return sl;
2477 }
2478
2479 static void free_alg(struct alg_spec *a)
2480 {
2481         kzfree(a->alg_string);
2482         kzfree(a->key);
2483         memset(a, 0, sizeof *a);
2484 }
2485
2486 static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval)
2487 {
2488         char *k;
2489
2490         free_alg(a);
2491
2492         a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL);
2493         if (!a->alg_string)
2494                 goto nomem;
2495
2496         k = strchr(a->alg_string, ':');
2497         if (k) {
2498                 *k = 0;
2499                 a->key_string = k + 1;
2500                 if (strlen(a->key_string) & 1)
2501                         goto inval;
2502
2503                 a->key_size = strlen(a->key_string) / 2;
2504                 a->key = kmalloc(a->key_size, GFP_KERNEL);
2505                 if (!a->key)
2506                         goto nomem;
2507                 if (hex2bin(a->key, a->key_string, a->key_size))
2508                         goto inval;
2509         }
2510
2511         return 0;
2512 inval:
2513         *error = error_inval;
2514         return -EINVAL;
2515 nomem:
2516         *error = "Out of memory for an argument";
2517         return -ENOMEM;
2518 }
2519
2520 static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error,
2521                    char *error_alg, char *error_key)
2522 {
2523         int r;
2524
2525         if (a->alg_string) {
2526                 *hash = crypto_alloc_shash(a->alg_string, 0, CRYPTO_ALG_ASYNC);
2527                 if (IS_ERR(*hash)) {
2528                         *error = error_alg;
2529                         r = PTR_ERR(*hash);
2530                         *hash = NULL;
2531                         return r;
2532                 }
2533
2534                 if (a->key) {
2535                         r = crypto_shash_setkey(*hash, a->key, a->key_size);
2536                         if (r) {
2537                                 *error = error_key;
2538                                 return r;
2539                         }
2540                 }
2541         }
2542
2543         return 0;
2544 }
2545
2546 static int create_journal(struct dm_integrity_c *ic, char **error)
2547 {
2548         int r = 0;
2549         unsigned i;
2550         __u64 journal_pages, journal_desc_size, journal_tree_size;
2551         unsigned char *crypt_data = NULL;
2552
2553         ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL);
2554         ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL);
2555         ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL);
2556         ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL);
2557
2558         journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
2559                                 PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
2560         journal_desc_size = journal_pages * sizeof(struct page_list);
2561         if (journal_pages >= totalram_pages - totalhigh_pages || journal_desc_size > ULONG_MAX) {
2562                 *error = "Journal doesn't fit into memory";
2563                 r = -ENOMEM;
2564                 goto bad;
2565         }
2566         ic->journal_pages = journal_pages;
2567
2568         ic->journal = dm_integrity_alloc_page_list(ic);
2569         if (!ic->journal) {
2570                 *error = "Could not allocate memory for journal";
2571                 r = -ENOMEM;
2572                 goto bad;
2573         }
2574         if (ic->journal_crypt_alg.alg_string) {
2575                 unsigned ivsize, blocksize;
2576                 struct journal_completion comp;
2577
2578                 comp.ic = ic;
2579                 ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, 0);
2580                 if (IS_ERR(ic->journal_crypt)) {
2581                         *error = "Invalid journal cipher";
2582                         r = PTR_ERR(ic->journal_crypt);
2583                         ic->journal_crypt = NULL;
2584                         goto bad;
2585                 }
2586                 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
2587                 blocksize = crypto_skcipher_blocksize(ic->journal_crypt);
2588
2589                 if (ic->journal_crypt_alg.key) {
2590                         r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key,
2591                                                    ic->journal_crypt_alg.key_size);
2592                         if (r) {
2593                                 *error = "Error setting encryption key";
2594                                 goto bad;
2595                         }
2596                 }
2597                 DEBUG_print("cipher %s, block size %u iv size %u\n",
2598                             ic->journal_crypt_alg.alg_string, blocksize, ivsize);
2599
2600                 ic->journal_io = dm_integrity_alloc_page_list(ic);
2601                 if (!ic->journal_io) {
2602                         *error = "Could not allocate memory for journal io";
2603                         r = -ENOMEM;
2604                         goto bad;
2605                 }
2606
2607                 if (blocksize == 1) {
2608                         struct scatterlist *sg;
2609                         SKCIPHER_REQUEST_ON_STACK(req, ic->journal_crypt);
2610                         unsigned char iv[ivsize];
2611                         skcipher_request_set_tfm(req, ic->journal_crypt);
2612
2613                         ic->journal_xor = dm_integrity_alloc_page_list(ic);
2614                         if (!ic->journal_xor) {
2615                                 *error = "Could not allocate memory for journal xor";
2616                                 r = -ENOMEM;
2617                                 goto bad;
2618                         }
2619
2620                         sg = dm_integrity_kvmalloc((ic->journal_pages + 1) * sizeof(struct scatterlist), 0);
2621                         if (!sg) {
2622                                 *error = "Unable to allocate sg list";
2623                                 r = -ENOMEM;
2624                                 goto bad;
2625                         }
2626                         sg_init_table(sg, ic->journal_pages + 1);
2627                         for (i = 0; i < ic->journal_pages; i++) {
2628                                 char *va = lowmem_page_address(ic->journal_xor[i].page);
2629                                 clear_page(va);
2630                                 sg_set_buf(&sg[i], va, PAGE_SIZE);
2631                         }
2632                         sg_set_buf(&sg[i], &ic->commit_ids, sizeof ic->commit_ids);
2633                         memset(iv, 0x00, ivsize);
2634
2635                         skcipher_request_set_crypt(req, sg, sg, PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, iv);
2636                         comp.comp = COMPLETION_INITIALIZER_ONSTACK(comp.comp);
2637                         comp.in_flight = (atomic_t)ATOMIC_INIT(1);
2638                         if (do_crypt(true, req, &comp))
2639                                 wait_for_completion(&comp.comp);
2640                         kvfree(sg);
2641                         r = dm_integrity_failed(ic);
2642                         if (r) {
2643                                 *error = "Unable to encrypt journal";
2644                                 goto bad;
2645                         }
2646                         DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data");
2647
2648                         crypto_free_skcipher(ic->journal_crypt);
2649                         ic->journal_crypt = NULL;
2650                 } else {
2651                         SKCIPHER_REQUEST_ON_STACK(req, ic->journal_crypt);
2652                         unsigned char iv[ivsize];
2653                         unsigned crypt_len = roundup(ivsize, blocksize);
2654
2655                         crypt_data = kmalloc(crypt_len, GFP_KERNEL);
2656                         if (!crypt_data) {
2657                                 *error = "Unable to allocate crypt data";
2658                                 r = -ENOMEM;
2659                                 goto bad;
2660                         }
2661
2662                         skcipher_request_set_tfm(req, ic->journal_crypt);
2663
2664                         ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal);
2665                         if (!ic->journal_scatterlist) {
2666                                 *error = "Unable to allocate sg list";
2667                                 r = -ENOMEM;
2668                                 goto bad;
2669                         }
2670                         ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io);
2671                         if (!ic->journal_io_scatterlist) {
2672                                 *error = "Unable to allocate sg list";
2673                                 r = -ENOMEM;
2674                                 goto bad;
2675                         }
2676                         ic->sk_requests = dm_integrity_kvmalloc(ic->journal_sections * sizeof(struct skcipher_request *), __GFP_ZERO);
2677                         if (!ic->sk_requests) {
2678                                 *error = "Unable to allocate sk requests";
2679                                 r = -ENOMEM;
2680                                 goto bad;
2681                         }
2682                         for (i = 0; i < ic->journal_sections; i++) {
2683                                 struct scatterlist sg;
2684                                 struct skcipher_request *section_req;
2685                                 __u32 section_le = cpu_to_le32(i);
2686
2687                                 memset(iv, 0x00, ivsize);
2688                                 memset(crypt_data, 0x00, crypt_len);
2689                                 memcpy(crypt_data, &section_le, min((size_t)crypt_len, sizeof(section_le)));
2690
2691                                 sg_init_one(&sg, crypt_data, crypt_len);
2692                                 skcipher_request_set_crypt(req, &sg, &sg, crypt_len, iv);
2693                                 comp.comp = COMPLETION_INITIALIZER_ONSTACK(comp.comp);
2694                                 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
2695                                 if (do_crypt(true, req, &comp))
2696                                         wait_for_completion(&comp.comp);
2697
2698                                 r = dm_integrity_failed(ic);
2699                                 if (r) {
2700                                         *error = "Unable to generate iv";
2701                                         goto bad;
2702                                 }
2703
2704                                 section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
2705                                 if (!section_req) {
2706                                         *error = "Unable to allocate crypt request";
2707                                         r = -ENOMEM;
2708                                         goto bad;
2709                                 }
2710                                 section_req->iv = kmalloc(ivsize * 2, GFP_KERNEL);
2711                                 if (!section_req->iv) {
2712                                         skcipher_request_free(section_req);
2713                                         *error = "Unable to allocate iv";
2714                                         r = -ENOMEM;
2715                                         goto bad;
2716                                 }
2717                                 memcpy(section_req->iv + ivsize, crypt_data, ivsize);
2718                                 section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT;
2719                                 ic->sk_requests[i] = section_req;
2720                                 DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i);
2721                         }
2722                 }
2723         }
2724
2725         for (i = 0; i < N_COMMIT_IDS; i++) {
2726                 unsigned j;
2727 retest_commit_id:
2728                 for (j = 0; j < i; j++) {
2729                         if (ic->commit_ids[j] == ic->commit_ids[i]) {
2730                                 ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1);
2731                                 goto retest_commit_id;
2732                         }
2733                 }
2734                 DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]);
2735         }
2736
2737         journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node);
2738         if (journal_tree_size > ULONG_MAX) {
2739                 *error = "Journal doesn't fit into memory";
2740                 r = -ENOMEM;
2741                 goto bad;
2742         }
2743         ic->journal_tree = dm_integrity_kvmalloc(journal_tree_size, 0);
2744         if (!ic->journal_tree) {
2745                 *error = "Could not allocate memory for journal tree";
2746                 r = -ENOMEM;
2747         }
2748 bad:
2749         kfree(crypt_data);
2750         return r;
2751 }
2752
2753 /*
2754  * Construct a integrity mapping
2755  *
2756  * Arguments:
2757  *      device
2758  *      offset from the start of the device
2759  *      tag size
2760  *      D - direct writes, J - journal writes, R - recovery mode
2761  *      number of optional arguments
2762  *      optional arguments:
2763  *              journal_sectors
2764  *              interleave_sectors
2765  *              buffer_sectors
2766  *              journal_watermark
2767  *              commit_time
2768  *              internal_hash
2769  *              journal_crypt
2770  *              journal_mac
2771  *              block_size
2772  */
2773 static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
2774 {
2775         struct dm_integrity_c *ic;
2776         char dummy;
2777         int r;
2778         unsigned extra_args;
2779         struct dm_arg_set as;
2780         static struct dm_arg _args[] = {
2781                 {0, 9, "Invalid number of feature args"},
2782         };
2783         unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
2784         bool should_write_sb;
2785         __u64 threshold;
2786         unsigned long long start;
2787
2788 #define DIRECT_ARGUMENTS        4
2789
2790         if (argc <= DIRECT_ARGUMENTS) {
2791                 ti->error = "Invalid argument count";
2792                 return -EINVAL;
2793         }
2794
2795         ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL);
2796         if (!ic) {
2797                 ti->error = "Cannot allocate integrity context";
2798                 return -ENOMEM;
2799         }
2800         ti->private = ic;
2801         ti->per_io_data_size = sizeof(struct dm_integrity_io);
2802
2803         ic->in_progress = RB_ROOT;
2804         init_waitqueue_head(&ic->endio_wait);
2805         bio_list_init(&ic->flush_bio_list);
2806         init_waitqueue_head(&ic->copy_to_journal_wait);
2807         init_completion(&ic->crypto_backoff);
2808
2809         r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
2810         if (r) {
2811                 ti->error = "Device lookup failed";
2812                 goto bad;
2813         }
2814
2815         if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) {
2816                 ti->error = "Invalid starting offset";
2817                 r = -EINVAL;
2818                 goto bad;
2819         }
2820         ic->start = start;
2821
2822         if (strcmp(argv[2], "-")) {
2823                 if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) {
2824                         ti->error = "Invalid tag size";
2825                         r = -EINVAL;
2826                         goto bad;
2827                 }
2828         }
2829
2830         if (!strcmp(argv[3], "J") || !strcmp(argv[3], "D") || !strcmp(argv[3], "R"))
2831                 ic->mode = argv[3][0];
2832         else {
2833                 ti->error = "Invalid mode (expecting J, D, R)";
2834                 r = -EINVAL;
2835                 goto bad;
2836         }
2837
2838         ic->device_sectors = i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT;
2839         journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS,
2840                         ic->device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR);
2841         interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
2842         buffer_sectors = DEFAULT_BUFFER_SECTORS;
2843         journal_watermark = DEFAULT_JOURNAL_WATERMARK;
2844         sync_msec = DEFAULT_SYNC_MSEC;
2845         ic->sectors_per_block = 1;
2846
2847         as.argc = argc - DIRECT_ARGUMENTS;
2848         as.argv = argv + DIRECT_ARGUMENTS;
2849         r = dm_read_arg_group(_args, &as, &extra_args, &ti->error);
2850         if (r)
2851                 goto bad;
2852
2853         while (extra_args--) {
2854                 const char *opt_string;
2855                 unsigned val;
2856                 opt_string = dm_shift_arg(&as);
2857                 if (!opt_string) {
2858                         r = -EINVAL;
2859                         ti->error = "Not enough feature arguments";
2860                         goto bad;
2861                 }
2862                 if (sscanf(opt_string, "journal_sectors:%u%c", &val, &dummy) == 1)
2863                         journal_sectors = val;
2864                 else if (sscanf(opt_string, "interleave_sectors:%u%c", &val, &dummy) == 1)
2865                         interleave_sectors = val;
2866                 else if (sscanf(opt_string, "buffer_sectors:%u%c", &val, &dummy) == 1)
2867                         buffer_sectors = val;
2868                 else if (sscanf(opt_string, "journal_watermark:%u%c", &val, &dummy) == 1 && val <= 100)
2869                         journal_watermark = val;
2870                 else if (sscanf(opt_string, "commit_time:%u%c", &val, &dummy) == 1)
2871                         sync_msec = val;
2872                 else if (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) {
2873                         if (val < 1 << SECTOR_SHIFT ||
2874                             val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT ||
2875                             (val & (val -1))) {
2876                                 r = -EINVAL;
2877                                 ti->error = "Invalid block_size argument";
2878                                 goto bad;
2879                         }
2880                         ic->sectors_per_block = val >> SECTOR_SHIFT;
2881                 } else if (!memcmp(opt_string, "internal_hash:", strlen("internal_hash:"))) {
2882                         r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error,
2883                                             "Invalid internal_hash argument");
2884                         if (r)
2885                                 goto bad;
2886                 } else if (!memcmp(opt_string, "journal_crypt:", strlen("journal_crypt:"))) {
2887                         r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error,
2888                                             "Invalid journal_crypt argument");
2889                         if (r)
2890                                 goto bad;
2891                 } else if (!memcmp(opt_string, "journal_mac:", strlen("journal_mac:"))) {
2892                         r = get_alg_and_key(opt_string, &ic->journal_mac_alg,  &ti->error,
2893                                             "Invalid journal_mac argument");
2894                         if (r)
2895                                 goto bad;
2896                 } else {
2897                         r = -EINVAL;
2898                         ti->error = "Invalid argument";
2899                         goto bad;
2900                 }
2901         }
2902
2903         r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error,
2904                     "Invalid internal hash", "Error setting internal hash key");
2905         if (r)
2906                 goto bad;
2907
2908         r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error,
2909                     "Invalid journal mac", "Error setting journal mac key");
2910         if (r)
2911                 goto bad;
2912
2913         if (!ic->tag_size) {
2914                 if (!ic->internal_hash) {
2915                         ti->error = "Unknown tag size";
2916                         r = -EINVAL;
2917                         goto bad;
2918                 }
2919                 ic->tag_size = crypto_shash_digestsize(ic->internal_hash);
2920         }
2921         if (ic->tag_size > MAX_TAG_SIZE) {
2922                 ti->error = "Too big tag size";
2923                 r = -EINVAL;
2924                 goto bad;
2925         }
2926         if (!(ic->tag_size & (ic->tag_size - 1)))
2927                 ic->log2_tag_size = __ffs(ic->tag_size);
2928         else
2929                 ic->log2_tag_size = -1;
2930
2931         ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
2932         ic->autocommit_msec = sync_msec;
2933         setup_timer(&ic->autocommit_timer, autocommit_fn, (unsigned long)ic);
2934
2935         ic->io = dm_io_client_create();
2936         if (IS_ERR(ic->io)) {
2937                 r = PTR_ERR(ic->io);
2938                 ic->io = NULL;
2939                 ti->error = "Cannot allocate dm io";
2940                 goto bad;
2941         }
2942
2943         ic->journal_io_mempool = mempool_create_slab_pool(JOURNAL_IO_MEMPOOL, journal_io_cache);
2944         if (!ic->journal_io_mempool) {
2945                 r = -ENOMEM;
2946                 ti->error = "Cannot allocate mempool";
2947                 goto bad;
2948         }
2949
2950         ic->metadata_wq = alloc_workqueue("dm-integrity-metadata",
2951                                           WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE);
2952         if (!ic->metadata_wq) {
2953                 ti->error = "Cannot allocate workqueue";
2954                 r = -ENOMEM;
2955                 goto bad;
2956         }
2957
2958         /*
2959          * If this workqueue were percpu, it would cause bio reordering
2960          * and reduced performance.
2961          */
2962         ic->wait_wq = alloc_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
2963         if (!ic->wait_wq) {
2964                 ti->error = "Cannot allocate workqueue";
2965                 r = -ENOMEM;
2966                 goto bad;
2967         }
2968
2969         ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1);
2970         if (!ic->commit_wq) {
2971                 ti->error = "Cannot allocate workqueue";
2972                 r = -ENOMEM;
2973                 goto bad;
2974         }
2975         INIT_WORK(&ic->commit_work, integrity_commit);
2976
2977         if (ic->mode == 'J') {
2978                 ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1);
2979                 if (!ic->writer_wq) {
2980                         ti->error = "Cannot allocate workqueue";
2981                         r = -ENOMEM;
2982                         goto bad;
2983                 }
2984                 INIT_WORK(&ic->writer_work, integrity_writer);
2985         }
2986
2987         ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL);
2988         if (!ic->sb) {
2989                 r = -ENOMEM;
2990                 ti->error = "Cannot allocate superblock area";
2991                 goto bad;
2992         }
2993
2994         r = sync_rw_sb(ic, REQ_OP_READ, 0);
2995         if (r) {
2996                 ti->error = "Error reading superblock";
2997                 goto bad;
2998         }
2999         should_write_sb = false;
3000         if (memcmp(ic->sb->magic, SB_MAGIC, 8)) {
3001                 if (ic->mode != 'R') {
3002                         if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) {
3003                                 r = -EINVAL;
3004                                 ti->error = "The device is not initialized";
3005                                 goto bad;
3006                         }
3007                 }
3008
3009                 r = initialize_superblock(ic, journal_sectors, interleave_sectors);
3010                 if (r) {
3011                         ti->error = "Could not initialize superblock";
3012                         goto bad;
3013                 }
3014                 if (ic->mode != 'R')
3015                         should_write_sb = true;
3016         }
3017
3018         if (ic->sb->version != SB_VERSION) {
3019                 r = -EINVAL;
3020                 ti->error = "Unknown version";
3021                 goto bad;
3022         }
3023         if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) {
3024                 r = -EINVAL;
3025                 ti->error = "Tag size doesn't match the information in superblock";
3026                 goto bad;
3027         }
3028         if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) {
3029                 r = -EINVAL;
3030                 ti->error = "Block size doesn't match the information in superblock";
3031                 goto bad;
3032         }
3033         /* make sure that ti->max_io_len doesn't overflow */
3034         if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS ||
3035             ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) {
3036                 r = -EINVAL;
3037                 ti->error = "Invalid interleave_sectors in the superblock";
3038                 goto bad;
3039         }
3040         ic->provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
3041         if (ic->provided_data_sectors != le64_to_cpu(ic->sb->provided_data_sectors)) {
3042                 /* test for overflow */
3043                 r = -EINVAL;
3044                 ti->error = "The superblock has 64-bit device size, but the kernel was compiled with 32-bit sectors";
3045                 goto bad;
3046         }
3047         if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
3048                 r = -EINVAL;
3049                 ti->error = "Journal mac mismatch";
3050                 goto bad;
3051         }
3052         r = calculate_device_limits(ic);
3053         if (r) {
3054                 ti->error = "The device is too small";
3055                 goto bad;
3056         }
3057
3058         if (!buffer_sectors)
3059                 buffer_sectors = 1;
3060         ic->log2_buffer_sectors = min3((int)__fls(buffer_sectors), (int)__ffs(ic->metadata_run), 31 - SECTOR_SHIFT);
3061
3062         threshold = (__u64)ic->journal_entries * (100 - journal_watermark);
3063         threshold += 50;
3064         do_div(threshold, 100);
3065         ic->free_sectors_threshold = threshold;
3066
3067         DEBUG_print("initialized:\n");
3068         DEBUG_print("   integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size));
3069         DEBUG_print("   journal_entry_size %u\n", ic->journal_entry_size);
3070         DEBUG_print("   journal_entries_per_sector %u\n", ic->journal_entries_per_sector);
3071         DEBUG_print("   journal_section_entries %u\n", ic->journal_section_entries);
3072         DEBUG_print("   journal_section_sectors %u\n", ic->journal_section_sectors);
3073         DEBUG_print("   journal_sections %u\n", (unsigned)le32_to_cpu(ic->sb->journal_sections));
3074         DEBUG_print("   journal_entries %u\n", ic->journal_entries);
3075         DEBUG_print("   log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors);
3076         DEBUG_print("   device_sectors 0x%llx\n", (unsigned long long)ic->device_sectors);
3077         DEBUG_print("   initial_sectors 0x%x\n", ic->initial_sectors);
3078         DEBUG_print("   metadata_run 0x%x\n", ic->metadata_run);
3079         DEBUG_print("   log2_metadata_run %d\n", ic->log2_metadata_run);
3080         DEBUG_print("   provided_data_sectors 0x%llx (%llu)\n", (unsigned long long)ic->provided_data_sectors,
3081                     (unsigned long long)ic->provided_data_sectors);
3082         DEBUG_print("   log2_buffer_sectors %u\n", ic->log2_buffer_sectors);
3083
3084         ic->bufio = dm_bufio_client_create(ic->dev->bdev, 1U << (SECTOR_SHIFT + ic->log2_buffer_sectors),
3085                                            1, 0, NULL, NULL);
3086         if (IS_ERR(ic->bufio)) {
3087                 r = PTR_ERR(ic->bufio);
3088                 ti->error = "Cannot initialize dm-bufio";
3089                 ic->bufio = NULL;
3090                 goto bad;
3091         }
3092         dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors);
3093
3094         if (ic->mode != 'R') {
3095                 r = create_journal(ic, &ti->error);
3096                 if (r)
3097                         goto bad;
3098         }
3099
3100         if (should_write_sb) {
3101                 int r;
3102
3103                 init_journal(ic, 0, ic->journal_sections, 0);
3104                 r = dm_integrity_failed(ic);
3105                 if (unlikely(r)) {
3106                         ti->error = "Error initializing journal";
3107                         goto bad;
3108                 }
3109                 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
3110                 if (r) {
3111                         ti->error = "Error initializing superblock";
3112                         goto bad;
3113                 }
3114                 ic->just_formatted = true;
3115         }
3116
3117         r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors);
3118         if (r)
3119                 goto bad;
3120
3121         if (!ic->internal_hash)
3122                 dm_integrity_set(ti, ic);
3123
3124         ti->num_flush_bios = 1;
3125         ti->flush_supported = true;
3126
3127         return 0;
3128 bad:
3129         dm_integrity_dtr(ti);
3130         return r;
3131 }
3132
3133 static void dm_integrity_dtr(struct dm_target *ti)
3134 {
3135         struct dm_integrity_c *ic = ti->private;
3136
3137         BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
3138
3139         if (ic->metadata_wq)
3140                 destroy_workqueue(ic->metadata_wq);
3141         if (ic->wait_wq)
3142                 destroy_workqueue(ic->wait_wq);
3143         if (ic->commit_wq)
3144                 destroy_workqueue(ic->commit_wq);
3145         if (ic->writer_wq)
3146                 destroy_workqueue(ic->writer_wq);
3147         if (ic->bufio)
3148                 dm_bufio_client_destroy(ic->bufio);
3149         mempool_destroy(ic->journal_io_mempool);
3150         if (ic->io)
3151                 dm_io_client_destroy(ic->io);
3152         if (ic->dev)
3153                 dm_put_device(ti, ic->dev);
3154         dm_integrity_free_page_list(ic, ic->journal);
3155         dm_integrity_free_page_list(ic, ic->journal_io);
3156         dm_integrity_free_page_list(ic, ic->journal_xor);
3157         if (ic->journal_scatterlist)
3158                 dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist);
3159         if (ic->journal_io_scatterlist)
3160                 dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist);
3161         if (ic->sk_requests) {
3162                 unsigned i;
3163
3164                 for (i = 0; i < ic->journal_sections; i++) {
3165                         struct skcipher_request *req = ic->sk_requests[i];
3166                         if (req) {
3167                                 kzfree(req->iv);
3168                                 skcipher_request_free(req);
3169                         }
3170                 }
3171                 kvfree(ic->sk_requests);
3172         }
3173         kvfree(ic->journal_tree);
3174         if (ic->sb)
3175                 free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT);
3176
3177         if (ic->internal_hash)
3178                 crypto_free_shash(ic->internal_hash);
3179         free_alg(&ic->internal_hash_alg);
3180
3181         if (ic->journal_crypt)
3182                 crypto_free_skcipher(ic->journal_crypt);
3183         free_alg(&ic->journal_crypt_alg);
3184
3185         if (ic->journal_mac)
3186                 crypto_free_shash(ic->journal_mac);
3187         free_alg(&ic->journal_mac_alg);
3188
3189         kfree(ic);
3190 }
3191
3192 static struct target_type integrity_target = {
3193         .name                   = "integrity",
3194         .version                = {1, 0, 0},
3195         .module                 = THIS_MODULE,
3196         .features               = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
3197         .ctr                    = dm_integrity_ctr,
3198         .dtr                    = dm_integrity_dtr,
3199         .map                    = dm_integrity_map,
3200         .postsuspend            = dm_integrity_postsuspend,
3201         .resume                 = dm_integrity_resume,
3202         .status                 = dm_integrity_status,
3203         .iterate_devices        = dm_integrity_iterate_devices,
3204         .io_hints               = dm_integrity_io_hints,
3205 };
3206
3207 int __init dm_integrity_init(void)
3208 {
3209         int r;
3210
3211         journal_io_cache = kmem_cache_create("integrity_journal_io",
3212                                              sizeof(struct journal_io), 0, 0, NULL);
3213         if (!journal_io_cache) {
3214                 DMERR("can't allocate journal io cache");
3215                 return -ENOMEM;
3216         }
3217
3218         r = dm_register_target(&integrity_target);
3219
3220         if (r < 0)
3221                 DMERR("register failed %d", r);
3222
3223         return r;
3224 }
3225
3226 void dm_integrity_exit(void)
3227 {
3228         dm_unregister_target(&integrity_target);
3229         kmem_cache_destroy(journal_io_cache);
3230 }
3231
3232 module_init(dm_integrity_init);
3233 module_exit(dm_integrity_exit);
3234
3235 MODULE_AUTHOR("Milan Broz");
3236 MODULE_AUTHOR("Mikulas Patocka");
3237 MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension");
3238 MODULE_LICENSE("GPL");