drivers/md/dm-integrity.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2016-2017 Red Hat, Inc. All rights reserved.
   4  * Copyright (C) 2016-2017 Milan Broz
   5  * Copyright (C) 2016-2017 Mikulas Patocka
   6  *
   7  * This file is released under the GPL.
   8  */
   9
  10 #include "dm-bio-record.h"
  11
  12 #include <linux/compiler.h>
  13 #include <linux/module.h>
  14 #include <linux/device-mapper.h>
  15 #include <linux/dm-io.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/sort.h>
  18 #include <linux/rbtree.h>
  19 #include <linux/delay.h>
  20 #include <linux/random.h>
  21 #include <linux/reboot.h>
  22 #include <crypto/hash.h>
  23 #include <crypto/skcipher.h>
  24 #include <linux/async_tx.h>
  25 #include <linux/dm-bufio.h>
  26
  27 #include "dm-audit.h"
  28
  29 #define DM_MSG_PREFIX "integrity"
  30
  31 #define DEFAULT_INTERLEAVE_SECTORS      32768
  32 #define DEFAULT_JOURNAL_SIZE_FACTOR     7
  33 #define DEFAULT_SECTORS_PER_BITMAP_BIT  32768
  34 #define DEFAULT_BUFFER_SECTORS          128
  35 #define DEFAULT_JOURNAL_WATERMARK       50
  36 #define DEFAULT_SYNC_MSEC               10000
  37 #define DEFAULT_MAX_JOURNAL_SECTORS     (IS_ENABLED(CONFIG_64BIT) ? 131072 : 8192)
  38 #define MIN_LOG2_INTERLEAVE_SECTORS     3
  39 #define MAX_LOG2_INTERLEAVE_SECTORS     31
  40 #define METADATA_WORKQUEUE_MAX_ACTIVE   16
  41 #define RECALC_SECTORS                  (IS_ENABLED(CONFIG_64BIT) ? 32768 : 2048)
  42 #define RECALC_WRITE_SUPER              16
  43 #define BITMAP_BLOCK_SIZE               4096    /* don't change it */
  44 #define BITMAP_FLUSH_INTERVAL           (10 * HZ)
  45 #define DISCARD_FILLER                  0xf6
  46 #define SALT_SIZE                       16
  47
  48 /*
  49  * Warning - DEBUG_PRINT prints security-sensitive data to the log,
  50  * so it should not be enabled in the official kernel
  51  */
  52 //#define DEBUG_PRINT
  53 //#define INTERNAL_VERIFY
  54
  55 /*
  56  * On disk structures
  57  */
  58
  59 #define SB_MAGIC                        "integrt"
  60 #define SB_VERSION_1                    1
  61 #define SB_VERSION_2                    2
  62 #define SB_VERSION_3                    3
  63 #define SB_VERSION_4                    4
  64 #define SB_VERSION_5                    5
  65 #define SB_SECTORS                      8
  66 #define MAX_SECTORS_PER_BLOCK           8
  67
  68 struct superblock {
  69         __u8 magic[8];
  70         __u8 version;
  71         __u8 log2_interleave_sectors;
  72         __le16 integrity_tag_size;
  73         __le32 journal_sections;
  74         __le64 provided_data_sectors;   /* userspace uses this value */
  75         __le32 flags;
  76         __u8 log2_sectors_per_block;
  77         __u8 log2_blocks_per_bitmap_bit;
  78         __u8 pad[2];
  79         __le64 recalc_sector;
  80         __u8 pad2[8];
  81         __u8 salt[SALT_SIZE];
  82 };
  83
  84 #define SB_FLAG_HAVE_JOURNAL_MAC        0x1
  85 #define SB_FLAG_RECALCULATING           0x2
  86 #define SB_FLAG_DIRTY_BITMAP            0x4
  87 #define SB_FLAG_FIXED_PADDING           0x8
  88 #define SB_FLAG_FIXED_HMAC              0x10
  89
  90 #define JOURNAL_ENTRY_ROUNDUP           8
  91
  92 typedef __le64 commit_id_t;
  93 #define JOURNAL_MAC_PER_SECTOR          8
  94
  95 struct journal_entry {
  96         union {
  97                 struct {
  98                         __le32 sector_lo;
  99                         __le32 sector_hi;
 100                 } s;
 101                 __le64 sector;
 102         } u;
 103         commit_id_t last_bytes[];
 104         /* __u8 tag[0]; */
 105 };
 106
 107 #define journal_entry_tag(ic, je)               ((__u8 *)&(je)->last_bytes[(ic)->sectors_per_block])
 108
 109 #if BITS_PER_LONG == 64
 110 #define journal_entry_set_sector(je, x)         do { smp_wmb(); WRITE_ONCE((je)->u.sector, cpu_to_le64(x)); } while (0)
 111 #else
 112 #define journal_entry_set_sector(je, x)         do { (je)->u.s.sector_lo = cpu_to_le32(x); smp_wmb(); WRITE_ONCE((je)->u.s.sector_hi, cpu_to_le32((x) >> 32)); } while (0)
 113 #endif
 114 #define journal_entry_get_sector(je)            le64_to_cpu((je)->u.sector)
 115 #define journal_entry_is_unused(je)             ((je)->u.s.sector_hi == cpu_to_le32(-1))
 116 #define journal_entry_set_unused(je)            ((je)->u.s.sector_hi = cpu_to_le32(-1))
 117 #define journal_entry_is_inprogress(je)         ((je)->u.s.sector_hi == cpu_to_le32(-2))
 118 #define journal_entry_set_inprogress(je)        ((je)->u.s.sector_hi = cpu_to_le32(-2))
 119
 120 #define JOURNAL_BLOCK_SECTORS           8
 121 #define JOURNAL_SECTOR_DATA             ((1 << SECTOR_SHIFT) - sizeof(commit_id_t))
 122 #define JOURNAL_MAC_SIZE                (JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS)
 123
 124 struct journal_sector {
 125         struct_group(sectors,
 126                 __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR];
 127                 __u8 mac[JOURNAL_MAC_PER_SECTOR];
 128         );
 129         commit_id_t commit_id;
 130 };
 131
 132 #define MAX_TAG_SIZE                    (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
 133
 134 #define METADATA_PADDING_SECTORS        8
 135
 136 #define N_COMMIT_IDS                    4
 137
 138 static unsigned char prev_commit_seq(unsigned char seq)
 139 {
 140         return (seq + N_COMMIT_IDS - 1) % N_COMMIT_IDS;
 141 }
 142
 143 static unsigned char next_commit_seq(unsigned char seq)
 144 {
 145         return (seq + 1) % N_COMMIT_IDS;
 146 }
 147
 148 /*
 149  * In-memory structures
 150  */
 151
 152 struct journal_node {
 153         struct rb_node node;
 154         sector_t sector;
 155 };
 156
 157 struct alg_spec {
 158         char *alg_string;
 159         char *key_string;
 160         __u8 *key;
 161         unsigned int key_size;
 162 };
 163
 164 struct dm_integrity_c {
 165         struct dm_dev *dev;
 166         struct dm_dev *meta_dev;
 167         unsigned int tag_size;
 168         __s8 log2_tag_size;
 169         sector_t start;
 170         mempool_t journal_io_mempool;
 171         struct dm_io_client *io;
 172         struct dm_bufio_client *bufio;
 173         struct workqueue_struct *metadata_wq;
 174         struct superblock *sb;
 175         unsigned int journal_pages;
 176         unsigned int n_bitmap_blocks;
 177
 178         struct page_list *journal;
 179         struct page_list *journal_io;
 180         struct page_list *journal_xor;
 181         struct page_list *recalc_bitmap;
 182         struct page_list *may_write_bitmap;
 183         struct bitmap_block_status *bbs;
 184         unsigned int bitmap_flush_interval;
 185         int synchronous_mode;
 186         struct bio_list synchronous_bios;
 187         struct delayed_work bitmap_flush_work;
 188
 189         struct crypto_skcipher *journal_crypt;
 190         struct scatterlist **journal_scatterlist;
 191         struct scatterlist **journal_io_scatterlist;
 192         struct skcipher_request **sk_requests;
 193
 194         struct crypto_shash *journal_mac;
 195
 196         struct journal_node *journal_tree;
 197         struct rb_root journal_tree_root;
 198
 199         sector_t provided_data_sectors;
 200
 201         unsigned short journal_entry_size;
 202         unsigned char journal_entries_per_sector;
 203         unsigned char journal_section_entries;
 204         unsigned short journal_section_sectors;
 205         unsigned int journal_sections;
 206         unsigned int journal_entries;
 207         sector_t data_device_sectors;
 208         sector_t meta_device_sectors;
 209         unsigned int initial_sectors;
 210         unsigned int metadata_run;
 211         __s8 log2_metadata_run;
 212         __u8 log2_buffer_sectors;
 213         __u8 sectors_per_block;
 214         __u8 log2_blocks_per_bitmap_bit;
 215
 216         unsigned char mode;
 217
 218         int failed;
 219
 220         struct crypto_shash *internal_hash;
 221
 222         struct dm_target *ti;
 223
 224         /* these variables are locked with endio_wait.lock */
 225         struct rb_root in_progress;
 226         struct list_head wait_list;
 227         wait_queue_head_t endio_wait;
 228         struct workqueue_struct *wait_wq;
 229         struct workqueue_struct *offload_wq;
 230
 231         unsigned char commit_seq;
 232         commit_id_t commit_ids[N_COMMIT_IDS];
 233
 234         unsigned int committed_section;
 235         unsigned int n_committed_sections;
 236
 237         unsigned int uncommitted_section;
 238         unsigned int n_uncommitted_sections;
 239
 240         unsigned int free_section;
 241         unsigned char free_section_entry;
 242         unsigned int free_sectors;
 243
 244         unsigned int free_sectors_threshold;
 245
 246         struct workqueue_struct *commit_wq;
 247         struct work_struct commit_work;
 248
 249         struct workqueue_struct *writer_wq;
 250         struct work_struct writer_work;
 251
 252         struct workqueue_struct *recalc_wq;
 253         struct work_struct recalc_work;
 254
 255         struct bio_list flush_bio_list;
 256
 257         unsigned long autocommit_jiffies;
 258         struct timer_list autocommit_timer;
 259         unsigned int autocommit_msec;
 260
 261         wait_queue_head_t copy_to_journal_wait;
 262
 263         struct completion crypto_backoff;
 264
 265         bool wrote_to_journal;
 266         bool journal_uptodate;
 267         bool just_formatted;
 268         bool recalculate_flag;
 269         bool reset_recalculate_flag;
 270         bool discard;
 271         bool fix_padding;
 272         bool fix_hmac;
 273         bool legacy_recalculate;
 274
 275         struct alg_spec internal_hash_alg;
 276         struct alg_spec journal_crypt_alg;
 277         struct alg_spec journal_mac_alg;
 278
 279         atomic64_t number_of_mismatches;
 280
 281         struct notifier_block reboot_notifier;
 282 };
 283
 284 struct dm_integrity_range {
 285         sector_t logical_sector;
 286         sector_t n_sectors;
 287         bool waiting;
 288         union {
 289                 struct rb_node node;
 290                 struct {
 291                         struct task_struct *task;
 292                         struct list_head wait_entry;
 293                 };
 294         };
 295 };
 296
 297 struct dm_integrity_io {
 298         struct work_struct work;
 299
 300         struct dm_integrity_c *ic;
 301         enum req_op op;
 302         bool fua;
 303
 304         struct dm_integrity_range range;
 305
 306         sector_t metadata_block;
 307         unsigned int metadata_offset;
 308
 309         atomic_t in_flight;
 310         blk_status_t bi_status;
 311
 312         struct completion *completion;
 313
 314         struct dm_bio_details bio_details;
 315 };
 316
 317 struct journal_completion {
 318         struct dm_integrity_c *ic;
 319         atomic_t in_flight;
 320         struct completion comp;
 321 };
 322
 323 struct journal_io {
 324         struct dm_integrity_range range;
 325         struct journal_completion *comp;
 326 };
 327
 328 struct bitmap_block_status {
 329         struct work_struct work;
 330         struct dm_integrity_c *ic;
 331         unsigned int idx;
 332         unsigned long *bitmap;
 333         struct bio_list bio_queue;
 334         spinlock_t bio_queue_lock;
 335
 336 };
 337
 338 static struct kmem_cache *journal_io_cache;
 339
 340 #define JOURNAL_IO_MEMPOOL      32
 341
 342 #ifdef DEBUG_PRINT
 343 #define DEBUG_print(x, ...)                     printk(KERN_DEBUG x, ##__VA_ARGS__)
 344 #define DEBUG_bytes(bytes, len, msg, ...)       printk(KERN_DEBUG msg "%s%*ph\n", ##__VA_ARGS__, \
 345                                                        len ? ": " : "", len, bytes)
 346 #else
 347 #define DEBUG_print(x, ...)                     do { } while (0)
 348 #define DEBUG_bytes(bytes, len, msg, ...)       do { } while (0)
 349 #endif
 350
 351 static void dm_integrity_prepare(struct request *rq)
 352 {
 353 }
 354
 355 static void dm_integrity_complete(struct request *rq, unsigned int nr_bytes)
 356 {
 357 }
 358
 359 /*
 360  * DM Integrity profile, protection is performed layer above (dm-crypt)
 361  */
 362 static const struct blk_integrity_profile dm_integrity_profile = {
 363         .name                   = "DM-DIF-EXT-TAG",
 364         .generate_fn            = NULL,
 365         .verify_fn              = NULL,
 366         .prepare_fn             = dm_integrity_prepare,
 367         .complete_fn            = dm_integrity_complete,
 368 };
 369
 370 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map);
 371 static void integrity_bio_wait(struct work_struct *w);
 372 static void dm_integrity_dtr(struct dm_target *ti);
 373
 374 static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err)
 375 {
 376         if (err == -EILSEQ)
 377                 atomic64_inc(&ic->number_of_mismatches);
 378         if (!cmpxchg(&ic->failed, 0, err))
 379                 DMERR("Error on %s: %d", msg, err);
 380 }
 381
 382 static int dm_integrity_failed(struct dm_integrity_c *ic)
 383 {
 384         return READ_ONCE(ic->failed);
 385 }
 386
 387 static bool dm_integrity_disable_recalculate(struct dm_integrity_c *ic)
 388 {
 389         if (ic->legacy_recalculate)
 390                 return false;
 391         if (!(ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) ?
 392             ic->internal_hash_alg.key || ic->journal_mac_alg.key :
 393             ic->internal_hash_alg.key && !ic->journal_mac_alg.key)
 394                 return true;
 395         return false;
 396 }
 397
 398 static commit_id_t dm_integrity_commit_id(struct dm_integrity_c *ic, unsigned int i,
 399                                           unsigned int j, unsigned char seq)
 400 {
 401         /*
 402          * Xor the number with section and sector, so that if a piece of
 403          * journal is written at wrong place, it is detected.
 404          */
 405         return ic->commit_ids[seq] ^ cpu_to_le64(((__u64)i << 32) ^ j);
 406 }
 407
 408 static void get_area_and_offset(struct dm_integrity_c *ic, sector_t data_sector,
 409                                 sector_t *area, sector_t *offset)
 410 {
 411         if (!ic->meta_dev) {
 412                 __u8 log2_interleave_sectors = ic->sb->log2_interleave_sectors;
 413                 *area = data_sector >> log2_interleave_sectors;
 414                 *offset = (unsigned int)data_sector & ((1U << log2_interleave_sectors) - 1);
 415         } else {
 416                 *area = 0;
 417                 *offset = data_sector;
 418         }
 419 }
 420
 421 #define sector_to_block(ic, n)                                          \
 422 do {                                                                    \
 423         BUG_ON((n) & (unsigned int)((ic)->sectors_per_block - 1));              \
 424         (n) >>= (ic)->sb->log2_sectors_per_block;                       \
 425 } while (0)
 426
 427 static __u64 get_metadata_sector_and_offset(struct dm_integrity_c *ic, sector_t area,
 428                                             sector_t offset, unsigned int *metadata_offset)
 429 {
 430         __u64 ms;
 431         unsigned int mo;
 432
 433         ms = area << ic->sb->log2_interleave_sectors;
 434         if (likely(ic->log2_metadata_run >= 0))
 435                 ms += area << ic->log2_metadata_run;
 436         else
 437                 ms += area * ic->metadata_run;
 438         ms >>= ic->log2_buffer_sectors;
 439
 440         sector_to_block(ic, offset);
 441
 442         if (likely(ic->log2_tag_size >= 0)) {
 443                 ms += offset >> (SECTOR_SHIFT + ic->log2_buffer_sectors - ic->log2_tag_size);
 444                 mo = (offset << ic->log2_tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
 445         } else {
 446                 ms += (__u64)offset * ic->tag_size >> (SECTOR_SHIFT + ic->log2_buffer_sectors);
 447                 mo = (offset * ic->tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
 448         }
 449         *metadata_offset = mo;
 450         return ms;
 451 }
 452
 453 static sector_t get_data_sector(struct dm_integrity_c *ic, sector_t area, sector_t offset)
 454 {
 455         sector_t result;
 456
 457         if (ic->meta_dev)
 458                 return offset;
 459
 460         result = area << ic->sb->log2_interleave_sectors;
 461         if (likely(ic->log2_metadata_run >= 0))
 462                 result += (area + 1) << ic->log2_metadata_run;
 463         else
 464                 result += (area + 1) * ic->metadata_run;
 465
 466         result += (sector_t)ic->initial_sectors + offset;
 467         result += ic->start;
 468
 469         return result;
 470 }
 471
 472 static void wraparound_section(struct dm_integrity_c *ic, unsigned int *sec_ptr)
 473 {
 474         if (unlikely(*sec_ptr >= ic->journal_sections))
 475                 *sec_ptr -= ic->journal_sections;
 476 }
 477
 478 static void sb_set_version(struct dm_integrity_c *ic)
 479 {
 480         if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC))
 481                 ic->sb->version = SB_VERSION_5;
 482         else if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING))
 483                 ic->sb->version = SB_VERSION_4;
 484         else if (ic->mode == 'B' || ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP))
 485                 ic->sb->version = SB_VERSION_3;
 486         else if (ic->meta_dev || ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
 487                 ic->sb->version = SB_VERSION_2;
 488         else
 489                 ic->sb->version = SB_VERSION_1;
 490 }
 491
 492 static int sb_mac(struct dm_integrity_c *ic, bool wr)
 493 {
 494         SHASH_DESC_ON_STACK(desc, ic->journal_mac);
 495         int r;
 496         unsigned int size = crypto_shash_digestsize(ic->journal_mac);
 497
 498         if (sizeof(struct superblock) + size > 1 << SECTOR_SHIFT) {
 499                 dm_integrity_io_error(ic, "digest is too long", -EINVAL);
 500                 return -EINVAL;
 501         }
 502
 503         desc->tfm = ic->journal_mac;
 504
 505         r = crypto_shash_init(desc);
 506         if (unlikely(r < 0)) {
 507                 dm_integrity_io_error(ic, "crypto_shash_init", r);
 508                 return r;
 509         }
 510
 511         r = crypto_shash_update(desc, (__u8 *)ic->sb, (1 << SECTOR_SHIFT) - size);
 512         if (unlikely(r < 0)) {
 513                 dm_integrity_io_error(ic, "crypto_shash_update", r);
 514                 return r;
 515         }
 516
 517         if (likely(wr)) {
 518                 r = crypto_shash_final(desc, (__u8 *)ic->sb + (1 << SECTOR_SHIFT) - size);
 519                 if (unlikely(r < 0)) {
 520                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 521                         return r;
 522                 }
 523         } else {
 524                 __u8 result[HASH_MAX_DIGESTSIZE];
 525
 526                 r = crypto_shash_final(desc, result);
 527                 if (unlikely(r < 0)) {
 528                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 529                         return r;
 530                 }
 531                 if (memcmp((__u8 *)ic->sb + (1 << SECTOR_SHIFT) - size, result, size)) {
 532                         dm_integrity_io_error(ic, "superblock mac", -EILSEQ);
 533                         dm_audit_log_target(DM_MSG_PREFIX, "mac-superblock", ic->ti, 0);
 534                         return -EILSEQ;
 535                 }
 536         }
 537
 538         return 0;
 539 }
 540
 541 static int sync_rw_sb(struct dm_integrity_c *ic, blk_opf_t opf)
 542 {
 543         struct dm_io_request io_req;
 544         struct dm_io_region io_loc;
 545         const enum req_op op = opf & REQ_OP_MASK;
 546         int r;
 547
 548         io_req.bi_opf = opf;
 549         io_req.mem.type = DM_IO_KMEM;
 550         io_req.mem.ptr.addr = ic->sb;
 551         io_req.notify.fn = NULL;
 552         io_req.client = ic->io;
 553         io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
 554         io_loc.sector = ic->start;
 555         io_loc.count = SB_SECTORS;
 556
 557         if (op == REQ_OP_WRITE) {
 558                 sb_set_version(ic);
 559                 if (ic->journal_mac && ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
 560                         r = sb_mac(ic, true);
 561                         if (unlikely(r))
 562                                 return r;
 563                 }
 564         }
 565
 566         r = dm_io(&io_req, 1, &io_loc, NULL);
 567         if (unlikely(r))
 568                 return r;
 569
 570         if (op == REQ_OP_READ) {
 571                 if (ic->mode != 'R' && ic->journal_mac && ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
 572                         r = sb_mac(ic, false);
 573                         if (unlikely(r))
 574                                 return r;
 575                 }
 576         }
 577
 578         return 0;
 579 }
 580
 581 #define BITMAP_OP_TEST_ALL_SET          0
 582 #define BITMAP_OP_TEST_ALL_CLEAR        1
 583 #define BITMAP_OP_SET                   2
 584 #define BITMAP_OP_CLEAR                 3
 585
 586 static bool block_bitmap_op(struct dm_integrity_c *ic, struct page_list *bitmap,
 587                             sector_t sector, sector_t n_sectors, int mode)
 588 {
 589         unsigned long bit, end_bit, this_end_bit, page, end_page;
 590         unsigned long *data;
 591
 592         if (unlikely(((sector | n_sectors) & ((1 << ic->sb->log2_sectors_per_block) - 1)) != 0)) {
 593                 DMCRIT("invalid bitmap access (%llx,%llx,%d,%d,%d)",
 594                         sector,
 595                         n_sectors,
 596                         ic->sb->log2_sectors_per_block,
 597                         ic->log2_blocks_per_bitmap_bit,
 598                         mode);
 599                 BUG();
 600         }
 601
 602         if (unlikely(!n_sectors))
 603                 return true;
 604
 605         bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 606         end_bit = (sector + n_sectors - 1) >>
 607                 (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 608
 609         page = bit / (PAGE_SIZE * 8);
 610         bit %= PAGE_SIZE * 8;
 611
 612         end_page = end_bit / (PAGE_SIZE * 8);
 613         end_bit %= PAGE_SIZE * 8;
 614
 615 repeat:
 616         if (page < end_page)
 617                 this_end_bit = PAGE_SIZE * 8 - 1;
 618         else
 619                 this_end_bit = end_bit;
 620
 621         data = lowmem_page_address(bitmap[page].page);
 622
 623         if (mode == BITMAP_OP_TEST_ALL_SET) {
 624                 while (bit <= this_end_bit) {
 625                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 626                                 do {
 627                                         if (data[bit / BITS_PER_LONG] != -1)
 628                                                 return false;
 629                                         bit += BITS_PER_LONG;
 630                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 631                                 continue;
 632                         }
 633                         if (!test_bit(bit, data))
 634                                 return false;
 635                         bit++;
 636                 }
 637         } else if (mode == BITMAP_OP_TEST_ALL_CLEAR) {
 638                 while (bit <= this_end_bit) {
 639                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 640                                 do {
 641                                         if (data[bit / BITS_PER_LONG] != 0)
 642                                                 return false;
 643                                         bit += BITS_PER_LONG;
 644                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 645                                 continue;
 646                         }
 647                         if (test_bit(bit, data))
 648                                 return false;
 649                         bit++;
 650                 }
 651         } else if (mode == BITMAP_OP_SET) {
 652                 while (bit <= this_end_bit) {
 653                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 654                                 do {
 655                                         data[bit / BITS_PER_LONG] = -1;
 656                                         bit += BITS_PER_LONG;
 657                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 658                                 continue;
 659                         }
 660                         __set_bit(bit, data);
 661                         bit++;
 662                 }
 663         } else if (mode == BITMAP_OP_CLEAR) {
 664                 if (!bit && this_end_bit == PAGE_SIZE * 8 - 1)
 665                         clear_page(data);
 666                 else {
 667                         while (bit <= this_end_bit) {
 668                                 if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 669                                         do {
 670                                                 data[bit / BITS_PER_LONG] = 0;
 671                                                 bit += BITS_PER_LONG;
 672                                         } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 673                                         continue;
 674                                 }
 675                                 __clear_bit(bit, data);
 676                                 bit++;
 677                         }
 678                 }
 679         } else {
 680                 BUG();
 681         }
 682
 683         if (unlikely(page < end_page)) {
 684                 bit = 0;
 685                 page++;
 686                 goto repeat;
 687         }
 688
 689         return true;
 690 }
 691
 692 static void block_bitmap_copy(struct dm_integrity_c *ic, struct page_list *dst, struct page_list *src)
 693 {
 694         unsigned int n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
 695         unsigned int i;
 696
 697         for (i = 0; i < n_bitmap_pages; i++) {
 698                 unsigned long *dst_data = lowmem_page_address(dst[i].page);
 699                 unsigned long *src_data = lowmem_page_address(src[i].page);
 700
 701                 copy_page(dst_data, src_data);
 702         }
 703 }
 704
 705 static struct bitmap_block_status *sector_to_bitmap_block(struct dm_integrity_c *ic, sector_t sector)
 706 {
 707         unsigned int bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 708         unsigned int bitmap_block = bit / (BITMAP_BLOCK_SIZE * 8);
 709
 710         BUG_ON(bitmap_block >= ic->n_bitmap_blocks);
 711         return &ic->bbs[bitmap_block];
 712 }
 713
 714 static void access_journal_check(struct dm_integrity_c *ic, unsigned int section, unsigned int offset,
 715                                  bool e, const char *function)
 716 {
 717 #if defined(CONFIG_DM_DEBUG) || defined(INTERNAL_VERIFY)
 718         unsigned int limit = e ? ic->journal_section_entries : ic->journal_section_sectors;
 719
 720         if (unlikely(section >= ic->journal_sections) ||
 721             unlikely(offset >= limit)) {
 722                 DMCRIT("%s: invalid access at (%u,%u), limit (%u,%u)",
 723                        function, section, offset, ic->journal_sections, limit);
 724                 BUG();
 725         }
 726 #endif
 727 }
 728
 729 static void page_list_location(struct dm_integrity_c *ic, unsigned int section, unsigned int offset,
 730                                unsigned int *pl_index, unsigned int *pl_offset)
 731 {
 732         unsigned int sector;
 733
 734         access_journal_check(ic, section, offset, false, "page_list_location");
 735
 736         sector = section * ic->journal_section_sectors + offset;
 737
 738         *pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
 739         *pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
 740 }
 741
 742 static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl,
 743                                                unsigned int section, unsigned int offset, unsigned int *n_sectors)
 744 {
 745         unsigned int pl_index, pl_offset;
 746         char *va;
 747
 748         page_list_location(ic, section, offset, &pl_index, &pl_offset);
 749
 750         if (n_sectors)
 751                 *n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT;
 752
 753         va = lowmem_page_address(pl[pl_index].page);
 754
 755         return (struct journal_sector *)(va + pl_offset);
 756 }
 757
 758 static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned int section, unsigned int offset)
 759 {
 760         return access_page_list(ic, ic->journal, section, offset, NULL);
 761 }
 762
 763 static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned int section, unsigned int n)
 764 {
 765         unsigned int rel_sector, offset;
 766         struct journal_sector *js;
 767
 768         access_journal_check(ic, section, n, true, "access_journal_entry");
 769
 770         rel_sector = n % JOURNAL_BLOCK_SECTORS;
 771         offset = n / JOURNAL_BLOCK_SECTORS;
 772
 773         js = access_journal(ic, section, rel_sector);
 774         return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size);
 775 }
 776
 777 static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned int section, unsigned int n)
 778 {
 779         n <<= ic->sb->log2_sectors_per_block;
 780
 781         n += JOURNAL_BLOCK_SECTORS;
 782
 783         access_journal_check(ic, section, n, false, "access_journal_data");
 784
 785         return access_journal(ic, section, n);
 786 }
 787
 788 static void section_mac(struct dm_integrity_c *ic, unsigned int section, __u8 result[JOURNAL_MAC_SIZE])
 789 {
 790         SHASH_DESC_ON_STACK(desc, ic->journal_mac);
 791         int r;
 792         unsigned int j, size;
 793
 794         desc->tfm = ic->journal_mac;
 795
 796         r = crypto_shash_init(desc);
 797         if (unlikely(r < 0)) {
 798                 dm_integrity_io_error(ic, "crypto_shash_init", r);
 799                 goto err;
 800         }
 801
 802         if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
 803                 __le64 section_le;
 804
 805                 r = crypto_shash_update(desc, (__u8 *)&ic->sb->salt, SALT_SIZE);
 806                 if (unlikely(r < 0)) {
 807                         dm_integrity_io_error(ic, "crypto_shash_update", r);
 808                         goto err;
 809                 }
 810
 811                 section_le = cpu_to_le64(section);
 812                 r = crypto_shash_update(desc, (__u8 *)&section_le, sizeof(section_le));
 813                 if (unlikely(r < 0)) {
 814                         dm_integrity_io_error(ic, "crypto_shash_update", r);
 815                         goto err;
 816                 }
 817         }
 818
 819         for (j = 0; j < ic->journal_section_entries; j++) {
 820                 struct journal_entry *je = access_journal_entry(ic, section, j);
 821
 822                 r = crypto_shash_update(desc, (__u8 *)&je->u.sector, sizeof(je->u.sector));
 823                 if (unlikely(r < 0)) {
 824                         dm_integrity_io_error(ic, "crypto_shash_update", r);
 825                         goto err;
 826                 }
 827         }
 828
 829         size = crypto_shash_digestsize(ic->journal_mac);
 830
 831         if (likely(size <= JOURNAL_MAC_SIZE)) {
 832                 r = crypto_shash_final(desc, result);
 833                 if (unlikely(r < 0)) {
 834                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 835                         goto err;
 836                 }
 837                 memset(result + size, 0, JOURNAL_MAC_SIZE - size);
 838         } else {
 839                 __u8 digest[HASH_MAX_DIGESTSIZE];
 840
 841                 if (WARN_ON(size > sizeof(digest))) {
 842                         dm_integrity_io_error(ic, "digest_size", -EINVAL);
 843                         goto err;
 844                 }
 845                 r = crypto_shash_final(desc, digest);
 846                 if (unlikely(r < 0)) {
 847                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 848                         goto err;
 849                 }
 850                 memcpy(result, digest, JOURNAL_MAC_SIZE);
 851         }
 852
 853         return;
 854 err:
 855         memset(result, 0, JOURNAL_MAC_SIZE);
 856 }
 857
 858 static void rw_section_mac(struct dm_integrity_c *ic, unsigned int section, bool wr)
 859 {
 860         __u8 result[JOURNAL_MAC_SIZE];
 861         unsigned int j;
 862
 863         if (!ic->journal_mac)
 864                 return;
 865
 866         section_mac(ic, section, result);
 867
 868         for (j = 0; j < JOURNAL_BLOCK_SECTORS; j++) {
 869                 struct journal_sector *js = access_journal(ic, section, j);
 870
 871                 if (likely(wr))
 872                         memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR);
 873                 else {
 874                         if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR)) {
 875                                 dm_integrity_io_error(ic, "journal mac", -EILSEQ);
 876                                 dm_audit_log_target(DM_MSG_PREFIX, "mac-journal", ic->ti, 0);
 877                         }
 878                 }
 879         }
 880 }
 881
 882 static void complete_journal_op(void *context)
 883 {
 884         struct journal_completion *comp = context;
 885
 886         BUG_ON(!atomic_read(&comp->in_flight));
 887         if (likely(atomic_dec_and_test(&comp->in_flight)))
 888                 complete(&comp->comp);
 889 }
 890
 891 static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned int section,
 892                         unsigned int n_sections, struct journal_completion *comp)
 893 {
 894         struct async_submit_ctl submit;
 895         size_t n_bytes = (size_t)(n_sections * ic->journal_section_sectors) << SECTOR_SHIFT;
 896         unsigned int pl_index, pl_offset, section_index;
 897         struct page_list *source_pl, *target_pl;
 898
 899         if (likely(encrypt)) {
 900                 source_pl = ic->journal;
 901                 target_pl = ic->journal_io;
 902         } else {
 903                 source_pl = ic->journal_io;
 904                 target_pl = ic->journal;
 905         }
 906
 907         page_list_location(ic, section, 0, &pl_index, &pl_offset);
 908
 909         atomic_add(roundup(pl_offset + n_bytes, PAGE_SIZE) >> PAGE_SHIFT, &comp->in_flight);
 910
 911         init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, complete_journal_op, comp, NULL);
 912
 913         section_index = pl_index;
 914
 915         do {
 916                 size_t this_step;
 917                 struct page *src_pages[2];
 918                 struct page *dst_page;
 919
 920                 while (unlikely(pl_index == section_index)) {
 921                         unsigned int dummy;
 922
 923                         if (likely(encrypt))
 924                                 rw_section_mac(ic, section, true);
 925                         section++;
 926                         n_sections--;
 927                         if (!n_sections)
 928                                 break;
 929                         page_list_location(ic, section, 0, &section_index, &dummy);
 930                 }
 931
 932                 this_step = min(n_bytes, (size_t)PAGE_SIZE - pl_offset);
 933                 dst_page = target_pl[pl_index].page;
 934                 src_pages[0] = source_pl[pl_index].page;
 935                 src_pages[1] = ic->journal_xor[pl_index].page;
 936
 937                 async_xor(dst_page, src_pages, pl_offset, 2, this_step, &submit);
 938
 939                 pl_index++;
 940                 pl_offset = 0;
 941                 n_bytes -= this_step;
 942         } while (n_bytes);
 943
 944         BUG_ON(n_sections);
 945
 946         async_tx_issue_pending_all();
 947 }
 948
 949 static void complete_journal_encrypt(void *data, int err)
 950 {
 951         struct journal_completion *comp = data;
 952
 953         if (unlikely(err)) {
 954                 if (likely(err == -EINPROGRESS)) {
 955                         complete(&comp->ic->crypto_backoff);
 956                         return;
 957                 }
 958                 dm_integrity_io_error(comp->ic, "asynchronous encrypt", err);
 959         }
 960         complete_journal_op(comp);
 961 }
 962
 963 static bool do_crypt(bool encrypt, struct skcipher_request *req, struct journal_completion *comp)
 964 {
 965         int r;
 966
 967         skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
 968                                       complete_journal_encrypt, comp);
 969         if (likely(encrypt))
 970                 r = crypto_skcipher_encrypt(req);
 971         else
 972                 r = crypto_skcipher_decrypt(req);
 973         if (likely(!r))
 974                 return false;
 975         if (likely(r == -EINPROGRESS))
 976                 return true;
 977         if (likely(r == -EBUSY)) {
 978                 wait_for_completion(&comp->ic->crypto_backoff);
 979                 reinit_completion(&comp->ic->crypto_backoff);
 980                 return true;
 981         }
 982         dm_integrity_io_error(comp->ic, "encrypt", r);
 983         return false;
 984 }
 985
 986 static void crypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned int section,
 987                           unsigned int n_sections, struct journal_completion *comp)
 988 {
 989         struct scatterlist **source_sg;
 990         struct scatterlist **target_sg;
 991
 992         atomic_add(2, &comp->in_flight);
 993
 994         if (likely(encrypt)) {
 995                 source_sg = ic->journal_scatterlist;
 996                 target_sg = ic->journal_io_scatterlist;
 997         } else {
 998                 source_sg = ic->journal_io_scatterlist;
 999                 target_sg = ic->journal_scatterlist;
1000         }
1001
1002         do {
1003                 struct skcipher_request *req;
1004                 unsigned int ivsize;
1005                 char *iv;
1006
1007                 if (likely(encrypt))
1008                         rw_section_mac(ic, section, true);
1009
1010                 req = ic->sk_requests[section];
1011                 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
1012                 iv = req->iv;
1013
1014                 memcpy(iv, iv + ivsize, ivsize);
1015
1016                 req->src = source_sg[section];
1017                 req->dst = target_sg[section];
1018
1019                 if (unlikely(do_crypt(encrypt, req, comp)))
1020                         atomic_inc(&comp->in_flight);
1021
1022                 section++;
1023                 n_sections--;
1024         } while (n_sections);
1025
1026         atomic_dec(&comp->in_flight);
1027         complete_journal_op(comp);
1028 }
1029
1030 static void encrypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned int section,
1031                             unsigned int n_sections, struct journal_completion *comp)
1032 {
1033         if (ic->journal_xor)
1034                 return xor_journal(ic, encrypt, section, n_sections, comp);
1035         else
1036                 return crypt_journal(ic, encrypt, section, n_sections, comp);
1037 }
1038
1039 static void complete_journal_io(unsigned long error, void *context)
1040 {
1041         struct journal_completion *comp = context;
1042
1043         if (unlikely(error != 0))
1044                 dm_integrity_io_error(comp->ic, "writing journal", -EIO);
1045         complete_journal_op(comp);
1046 }
1047
1048 static void rw_journal_sectors(struct dm_integrity_c *ic, blk_opf_t opf,
1049                                unsigned int sector, unsigned int n_sectors,
1050                                struct journal_completion *comp)
1051 {
1052         struct dm_io_request io_req;
1053         struct dm_io_region io_loc;
1054         unsigned int pl_index, pl_offset;
1055         int r;
1056
1057         if (unlikely(dm_integrity_failed(ic))) {
1058                 if (comp)
1059                         complete_journal_io(-1UL, comp);
1060                 return;
1061         }
1062
1063         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
1064         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
1065
1066         io_req.bi_opf = opf;
1067         io_req.mem.type = DM_IO_PAGE_LIST;
1068         if (ic->journal_io)
1069                 io_req.mem.ptr.pl = &ic->journal_io[pl_index];
1070         else
1071                 io_req.mem.ptr.pl = &ic->journal[pl_index];
1072         io_req.mem.offset = pl_offset;
1073         if (likely(comp != NULL)) {
1074                 io_req.notify.fn = complete_journal_io;
1075                 io_req.notify.context = comp;
1076         } else {
1077                 io_req.notify.fn = NULL;
1078         }
1079         io_req.client = ic->io;
1080         io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
1081         io_loc.sector = ic->start + SB_SECTORS + sector;
1082         io_loc.count = n_sectors;
1083
1084         r = dm_io(&io_req, 1, &io_loc, NULL);
1085         if (unlikely(r)) {
1086                 dm_integrity_io_error(ic, (opf & REQ_OP_MASK) == REQ_OP_READ ?
1087                                       "reading journal" : "writing journal", r);
1088                 if (comp) {
1089                         WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
1090                         complete_journal_io(-1UL, comp);
1091                 }
1092         }
1093 }
1094
1095 static void rw_journal(struct dm_integrity_c *ic, blk_opf_t opf,
1096                        unsigned int section, unsigned int n_sections,
1097                        struct journal_completion *comp)
1098 {
1099         unsigned int sector, n_sectors;
1100
1101         sector = section * ic->journal_section_sectors;
1102         n_sectors = n_sections * ic->journal_section_sectors;
1103
1104         rw_journal_sectors(ic, opf, sector, n_sectors, comp);
1105 }
1106
1107 static void write_journal(struct dm_integrity_c *ic, unsigned int commit_start, unsigned int commit_sections)
1108 {
1109         struct journal_completion io_comp;
1110         struct journal_completion crypt_comp_1;
1111         struct journal_completion crypt_comp_2;
1112         unsigned int i;
1113
1114         io_comp.ic = ic;
1115         init_completion(&io_comp.comp);
1116
1117         if (commit_start + commit_sections <= ic->journal_sections) {
1118                 io_comp.in_flight = (atomic_t)ATOMIC_INIT(1);
1119                 if (ic->journal_io) {
1120                         crypt_comp_1.ic = ic;
1121                         init_completion(&crypt_comp_1.comp);
1122                         crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1123                         encrypt_journal(ic, true, commit_start, commit_sections, &crypt_comp_1);
1124                         wait_for_completion_io(&crypt_comp_1.comp);
1125                 } else {
1126                         for (i = 0; i < commit_sections; i++)
1127                                 rw_section_mac(ic, commit_start + i, true);
1128                 }
1129                 rw_journal(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, commit_start,
1130                            commit_sections, &io_comp);
1131         } else {
1132                 unsigned int to_end;
1133
1134                 io_comp.in_flight = (atomic_t)ATOMIC_INIT(2);
1135                 to_end = ic->journal_sections - commit_start;
1136                 if (ic->journal_io) {
1137                         crypt_comp_1.ic = ic;
1138                         init_completion(&crypt_comp_1.comp);
1139                         crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1140                         encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1);
1141                         if (try_wait_for_completion(&crypt_comp_1.comp)) {
1142                                 rw_journal(ic, REQ_OP_WRITE | REQ_FUA,
1143                                            commit_start, to_end, &io_comp);
1144                                 reinit_completion(&crypt_comp_1.comp);
1145                                 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1146                                 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1);
1147                                 wait_for_completion_io(&crypt_comp_1.comp);
1148                         } else {
1149                                 crypt_comp_2.ic = ic;
1150                                 init_completion(&crypt_comp_2.comp);
1151                                 crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0);
1152                                 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2);
1153                                 wait_for_completion_io(&crypt_comp_1.comp);
1154                                 rw_journal(ic, REQ_OP_WRITE | REQ_FUA, commit_start, to_end, &io_comp);
1155                                 wait_for_completion_io(&crypt_comp_2.comp);
1156                         }
1157                 } else {
1158                         for (i = 0; i < to_end; i++)
1159                                 rw_section_mac(ic, commit_start + i, true);
1160                         rw_journal(ic, REQ_OP_WRITE | REQ_FUA, commit_start, to_end, &io_comp);
1161                         for (i = 0; i < commit_sections - to_end; i++)
1162                                 rw_section_mac(ic, i, true);
1163                 }
1164                 rw_journal(ic, REQ_OP_WRITE | REQ_FUA, 0, commit_sections - to_end, &io_comp);
1165         }
1166
1167         wait_for_completion_io(&io_comp.comp);
1168 }
1169
1170 static void copy_from_journal(struct dm_integrity_c *ic, unsigned int section, unsigned int offset,
1171                               unsigned int n_sectors, sector_t target, io_notify_fn fn, void *data)
1172 {
1173         struct dm_io_request io_req;
1174         struct dm_io_region io_loc;
1175         int r;
1176         unsigned int sector, pl_index, pl_offset;
1177
1178         BUG_ON((target | n_sectors | offset) & (unsigned int)(ic->sectors_per_block - 1));
1179
1180         if (unlikely(dm_integrity_failed(ic))) {
1181                 fn(-1UL, data);
1182                 return;
1183         }
1184
1185         sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset;
1186
1187         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
1188         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
1189
1190         io_req.bi_opf = REQ_OP_WRITE;
1191         io_req.mem.type = DM_IO_PAGE_LIST;
1192         io_req.mem.ptr.pl = &ic->journal[pl_index];
1193         io_req.mem.offset = pl_offset;
1194         io_req.notify.fn = fn;
1195         io_req.notify.context = data;
1196         io_req.client = ic->io;
1197         io_loc.bdev = ic->dev->bdev;
1198         io_loc.sector = target;
1199         io_loc.count = n_sectors;
1200
1201         r = dm_io(&io_req, 1, &io_loc, NULL);
1202         if (unlikely(r)) {
1203                 WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
1204                 fn(-1UL, data);
1205         }
1206 }
1207
1208 static bool ranges_overlap(struct dm_integrity_range *range1, struct dm_integrity_range *range2)
1209 {
1210         return range1->logical_sector < range2->logical_sector + range2->n_sectors &&
1211                range1->logical_sector + range1->n_sectors > range2->logical_sector;
1212 }
1213
1214 static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range, bool check_waiting)
1215 {
1216         struct rb_node **n = &ic->in_progress.rb_node;
1217         struct rb_node *parent;
1218
1219         BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned int)(ic->sectors_per_block - 1));
1220
1221         if (likely(check_waiting)) {
1222                 struct dm_integrity_range *range;
1223
1224                 list_for_each_entry(range, &ic->wait_list, wait_entry) {
1225                         if (unlikely(ranges_overlap(range, new_range)))
1226                                 return false;
1227                 }
1228         }
1229
1230         parent = NULL;
1231
1232         while (*n) {
1233                 struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node);
1234
1235                 parent = *n;
1236                 if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector)
1237                         n = &range->node.rb_left;
1238                 else if (new_range->logical_sector >= range->logical_sector + range->n_sectors)
1239                         n = &range->node.rb_right;
1240                 else
1241                         return false;
1242         }
1243
1244         rb_link_node(&new_range->node, parent, n);
1245         rb_insert_color(&new_range->node, &ic->in_progress);
1246
1247         return true;
1248 }
1249
1250 static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1251 {
1252         rb_erase(&range->node, &ic->in_progress);
1253         while (unlikely(!list_empty(&ic->wait_list))) {
1254                 struct dm_integrity_range *last_range =
1255                         list_first_entry(&ic->wait_list, struct dm_integrity_range, wait_entry);
1256                 struct task_struct *last_range_task;
1257
1258                 last_range_task = last_range->task;
1259                 list_del(&last_range->wait_entry);
1260                 if (!add_new_range(ic, last_range, false)) {
1261                         last_range->task = last_range_task;
1262                         list_add(&last_range->wait_entry, &ic->wait_list);
1263                         break;
1264                 }
1265                 last_range->waiting = false;
1266                 wake_up_process(last_range_task);
1267         }
1268 }
1269
1270 static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1271 {
1272         unsigned long flags;
1273
1274         spin_lock_irqsave(&ic->endio_wait.lock, flags);
1275         remove_range_unlocked(ic, range);
1276         spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1277 }
1278
1279 static void wait_and_add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1280 {
1281         new_range->waiting = true;
1282         list_add_tail(&new_range->wait_entry, &ic->wait_list);
1283         new_range->task = current;
1284         do {
1285                 __set_current_state(TASK_UNINTERRUPTIBLE);
1286                 spin_unlock_irq(&ic->endio_wait.lock);
1287                 io_schedule();
1288                 spin_lock_irq(&ic->endio_wait.lock);
1289         } while (unlikely(new_range->waiting));
1290 }
1291
1292 static void add_new_range_and_wait(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1293 {
1294         if (unlikely(!add_new_range(ic, new_range, true)))
1295                 wait_and_add_new_range(ic, new_range);
1296 }
1297
1298 static void init_journal_node(struct journal_node *node)
1299 {
1300         RB_CLEAR_NODE(&node->node);
1301         node->sector = (sector_t)-1;
1302 }
1303
1304 static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector)
1305 {
1306         struct rb_node **link;
1307         struct rb_node *parent;
1308
1309         node->sector = sector;
1310         BUG_ON(!RB_EMPTY_NODE(&node->node));
1311
1312         link = &ic->journal_tree_root.rb_node;
1313         parent = NULL;
1314
1315         while (*link) {
1316                 struct journal_node *j;
1317
1318                 parent = *link;
1319                 j = container_of(parent, struct journal_node, node);
1320                 if (sector < j->sector)
1321                         link = &j->node.rb_left;
1322                 else
1323                         link = &j->node.rb_right;
1324         }
1325
1326         rb_link_node(&node->node, parent, link);
1327         rb_insert_color(&node->node, &ic->journal_tree_root);
1328 }
1329
1330 static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node)
1331 {
1332         BUG_ON(RB_EMPTY_NODE(&node->node));
1333         rb_erase(&node->node, &ic->journal_tree_root);
1334         init_journal_node(node);
1335 }
1336
1337 #define NOT_FOUND       (-1U)
1338
1339 static unsigned int find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector)
1340 {
1341         struct rb_node *n = ic->journal_tree_root.rb_node;
1342         unsigned int found = NOT_FOUND;
1343
1344         *next_sector = (sector_t)-1;
1345         while (n) {
1346                 struct journal_node *j = container_of(n, struct journal_node, node);
1347
1348                 if (sector == j->sector)
1349                         found = j - ic->journal_tree;
1350
1351                 if (sector < j->sector) {
1352                         *next_sector = j->sector;
1353                         n = j->node.rb_left;
1354                 } else
1355                         n = j->node.rb_right;
1356         }
1357
1358         return found;
1359 }
1360
1361 static bool test_journal_node(struct dm_integrity_c *ic, unsigned int pos, sector_t sector)
1362 {
1363         struct journal_node *node, *next_node;
1364         struct rb_node *next;
1365
1366         if (unlikely(pos >= ic->journal_entries))
1367                 return false;
1368         node = &ic->journal_tree[pos];
1369         if (unlikely(RB_EMPTY_NODE(&node->node)))
1370                 return false;
1371         if (unlikely(node->sector != sector))
1372                 return false;
1373
1374         next = rb_next(&node->node);
1375         if (unlikely(!next))
1376                 return true;
1377
1378         next_node = container_of(next, struct journal_node, node);
1379         return next_node->sector != sector;
1380 }
1381
1382 static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node)
1383 {
1384         struct rb_node *next;
1385         struct journal_node *next_node;
1386         unsigned int next_section;
1387
1388         BUG_ON(RB_EMPTY_NODE(&node->node));
1389
1390         next = rb_next(&node->node);
1391         if (unlikely(!next))
1392                 return false;
1393
1394         next_node = container_of(next, struct journal_node, node);
1395
1396         if (next_node->sector != node->sector)
1397                 return false;
1398
1399         next_section = (unsigned int)(next_node - ic->journal_tree) / ic->journal_section_entries;
1400         if (next_section >= ic->committed_section &&
1401             next_section < ic->committed_section + ic->n_committed_sections)
1402                 return true;
1403         if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections)
1404                 return true;
1405
1406         return false;
1407 }
1408
1409 #define TAG_READ        0
1410 #define TAG_WRITE       1
1411 #define TAG_CMP         2
1412
1413 static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block,
1414                                unsigned int *metadata_offset, unsigned int total_size, int op)
1415 {
1416 #define MAY_BE_FILLER           1
1417 #define MAY_BE_HASH             2
1418         unsigned int hash_offset = 0;
1419         unsigned int may_be = MAY_BE_HASH | (ic->discard ? MAY_BE_FILLER : 0);
1420
1421         do {
1422                 unsigned char *data, *dp;
1423                 struct dm_buffer *b;
1424                 unsigned int to_copy;
1425                 int r;
1426
1427                 r = dm_integrity_failed(ic);
1428                 if (unlikely(r))
1429                         return r;
1430
1431                 data = dm_bufio_read(ic->bufio, *metadata_block, &b);
1432                 if (IS_ERR(data))
1433                         return PTR_ERR(data);
1434
1435                 to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size);
1436                 dp = data + *metadata_offset;
1437                 if (op == TAG_READ) {
1438                         memcpy(tag, dp, to_copy);
1439                 } else if (op == TAG_WRITE) {
1440                         if (memcmp(dp, tag, to_copy)) {
1441                                 memcpy(dp, tag, to_copy);
1442                                 dm_bufio_mark_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy);
1443                         }
1444                 } else {
1445                         /* e.g.: op == TAG_CMP */
1446
1447                         if (likely(is_power_of_2(ic->tag_size))) {
1448                                 if (unlikely(memcmp(dp, tag, to_copy)))
1449                                         if (unlikely(!ic->discard) ||
1450                                             unlikely(memchr_inv(dp, DISCARD_FILLER, to_copy) != NULL)) {
1451                                                 goto thorough_test;
1452                                 }
1453                         } else {
1454                                 unsigned int i, ts;
1455 thorough_test:
1456                                 ts = total_size;
1457
1458                                 for (i = 0; i < to_copy; i++, ts--) {
1459                                         if (unlikely(dp[i] != tag[i]))
1460                                                 may_be &= ~MAY_BE_HASH;
1461                                         if (likely(dp[i] != DISCARD_FILLER))
1462                                                 may_be &= ~MAY_BE_FILLER;
1463                                         hash_offset++;
1464                                         if (unlikely(hash_offset == ic->tag_size)) {
1465                                                 if (unlikely(!may_be)) {
1466                                                         dm_bufio_release(b);
1467                                                         return ts;
1468                                                 }
1469                                                 hash_offset = 0;
1470                                                 may_be = MAY_BE_HASH | (ic->discard ? MAY_BE_FILLER : 0);
1471                                         }
1472                                 }
1473                         }
1474                 }
1475                 dm_bufio_release(b);
1476
1477                 tag += to_copy;
1478                 *metadata_offset += to_copy;
1479                 if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) {
1480                         (*metadata_block)++;
1481                         *metadata_offset = 0;
1482                 }
1483
1484                 if (unlikely(!is_power_of_2(ic->tag_size)))
1485                         hash_offset = (hash_offset + to_copy) % ic->tag_size;
1486
1487                 total_size -= to_copy;
1488         } while (unlikely(total_size));
1489
1490         return 0;
1491 #undef MAY_BE_FILLER
1492 #undef MAY_BE_HASH
1493 }
1494
1495 struct flush_request {
1496         struct dm_io_request io_req;
1497         struct dm_io_region io_reg;
1498         struct dm_integrity_c *ic;
1499         struct completion comp;
1500 };
1501
1502 static void flush_notify(unsigned long error, void *fr_)
1503 {
1504         struct flush_request *fr = fr_;
1505
1506         if (unlikely(error != 0))
1507                 dm_integrity_io_error(fr->ic, "flushing disk cache", -EIO);
1508         complete(&fr->comp);
1509 }
1510
1511 static void dm_integrity_flush_buffers(struct dm_integrity_c *ic, bool flush_data)
1512 {
1513         int r;
1514         struct flush_request fr;
1515
1516         if (!ic->meta_dev)
1517                 flush_data = false;
1518         if (flush_data) {
1519                 fr.io_req.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC,
1520                 fr.io_req.mem.type = DM_IO_KMEM,
1521                 fr.io_req.mem.ptr.addr = NULL,
1522                 fr.io_req.notify.fn = flush_notify,
1523                 fr.io_req.notify.context = &fr;
1524                 fr.io_req.client = dm_bufio_get_dm_io_client(ic->bufio),
1525                 fr.io_reg.bdev = ic->dev->bdev,
1526                 fr.io_reg.sector = 0,
1527                 fr.io_reg.count = 0,
1528                 fr.ic = ic;
1529                 init_completion(&fr.comp);
1530                 r = dm_io(&fr.io_req, 1, &fr.io_reg, NULL);
1531                 BUG_ON(r);
1532         }
1533
1534         r = dm_bufio_write_dirty_buffers(ic->bufio);
1535         if (unlikely(r))
1536                 dm_integrity_io_error(ic, "writing tags", r);
1537
1538         if (flush_data)
1539                 wait_for_completion(&fr.comp);
1540 }
1541
1542 static void sleep_on_endio_wait(struct dm_integrity_c *ic)
1543 {
1544         DECLARE_WAITQUEUE(wait, current);
1545
1546         __add_wait_queue(&ic->endio_wait, &wait);
1547         __set_current_state(TASK_UNINTERRUPTIBLE);
1548         spin_unlock_irq(&ic->endio_wait.lock);
1549         io_schedule();
1550         spin_lock_irq(&ic->endio_wait.lock);
1551         __remove_wait_queue(&ic->endio_wait, &wait);
1552 }
1553
1554 static void autocommit_fn(struct timer_list *t)
1555 {
1556         struct dm_integrity_c *ic = from_timer(ic, t, autocommit_timer);
1557
1558         if (likely(!dm_integrity_failed(ic)))
1559                 queue_work(ic->commit_wq, &ic->commit_work);
1560 }
1561
1562 static void schedule_autocommit(struct dm_integrity_c *ic)
1563 {
1564         if (!timer_pending(&ic->autocommit_timer))
1565                 mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies);
1566 }
1567
1568 static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1569 {
1570         struct bio *bio;
1571         unsigned long flags;
1572
1573         spin_lock_irqsave(&ic->endio_wait.lock, flags);
1574         bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1575         bio_list_add(&ic->flush_bio_list, bio);
1576         spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1577
1578         queue_work(ic->commit_wq, &ic->commit_work);
1579 }
1580
1581 static void do_endio(struct dm_integrity_c *ic, struct bio *bio)
1582 {
1583         int r;
1584
1585         r = dm_integrity_failed(ic);
1586         if (unlikely(r) && !bio->bi_status)
1587                 bio->bi_status = errno_to_blk_status(r);
1588         if (unlikely(ic->synchronous_mode) && bio_op(bio) == REQ_OP_WRITE) {
1589                 unsigned long flags;
1590
1591                 spin_lock_irqsave(&ic->endio_wait.lock, flags);
1592                 bio_list_add(&ic->synchronous_bios, bio);
1593                 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
1594                 spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1595                 return;
1596         }
1597         bio_endio(bio);
1598 }
1599
1600 static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1601 {
1602         struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1603
1604         if (unlikely(dio->fua) && likely(!bio->bi_status) && likely(!dm_integrity_failed(ic)))
1605                 submit_flush_bio(ic, dio);
1606         else
1607                 do_endio(ic, bio);
1608 }
1609
1610 static void dec_in_flight(struct dm_integrity_io *dio)
1611 {
1612         if (atomic_dec_and_test(&dio->in_flight)) {
1613                 struct dm_integrity_c *ic = dio->ic;
1614                 struct bio *bio;
1615
1616                 remove_range(ic, &dio->range);
1617
1618                 if (dio->op == REQ_OP_WRITE || unlikely(dio->op == REQ_OP_DISCARD))
1619                         schedule_autocommit(ic);
1620
1621                 bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1622                 if (unlikely(dio->bi_status) && !bio->bi_status)
1623                         bio->bi_status = dio->bi_status;
1624                 if (likely(!bio->bi_status) && unlikely(bio_sectors(bio) != dio->range.n_sectors)) {
1625                         dio->range.logical_sector += dio->range.n_sectors;
1626                         bio_advance(bio, dio->range.n_sectors << SECTOR_SHIFT);
1627                         INIT_WORK(&dio->work, integrity_bio_wait);
1628                         queue_work(ic->offload_wq, &dio->work);
1629                         return;
1630                 }
1631                 do_endio_flush(ic, dio);
1632         }
1633 }
1634
1635 static void integrity_end_io(struct bio *bio)
1636 {
1637         struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1638
1639         dm_bio_restore(&dio->bio_details, bio);
1640         if (bio->bi_integrity)
1641                 bio->bi_opf |= REQ_INTEGRITY;
1642
1643         if (dio->completion)
1644                 complete(dio->completion);
1645
1646         dec_in_flight(dio);
1647 }
1648
1649 static void integrity_sector_checksum(struct dm_integrity_c *ic, sector_t sector,
1650                                       const char *data, char *result)
1651 {
1652         __le64 sector_le = cpu_to_le64(sector);
1653         SHASH_DESC_ON_STACK(req, ic->internal_hash);
1654         int r;
1655         unsigned int digest_size;
1656
1657         req->tfm = ic->internal_hash;
1658
1659         r = crypto_shash_init(req);
1660         if (unlikely(r < 0)) {
1661                 dm_integrity_io_error(ic, "crypto_shash_init", r);
1662                 goto failed;
1663         }
1664
1665         if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
1666                 r = crypto_shash_update(req, (__u8 *)&ic->sb->salt, SALT_SIZE);
1667                 if (unlikely(r < 0)) {
1668                         dm_integrity_io_error(ic, "crypto_shash_update", r);
1669                         goto failed;
1670                 }
1671         }
1672
1673         r = crypto_shash_update(req, (const __u8 *)&sector_le, sizeof(sector_le));
1674         if (unlikely(r < 0)) {
1675                 dm_integrity_io_error(ic, "crypto_shash_update", r);
1676                 goto failed;
1677         }
1678
1679         r = crypto_shash_update(req, data, ic->sectors_per_block << SECTOR_SHIFT);
1680         if (unlikely(r < 0)) {
1681                 dm_integrity_io_error(ic, "crypto_shash_update", r);
1682                 goto failed;
1683         }
1684
1685         r = crypto_shash_final(req, result);
1686         if (unlikely(r < 0)) {
1687                 dm_integrity_io_error(ic, "crypto_shash_final", r);
1688                 goto failed;
1689         }
1690
1691         digest_size = crypto_shash_digestsize(ic->internal_hash);
1692         if (unlikely(digest_size < ic->tag_size))
1693                 memset(result + digest_size, 0, ic->tag_size - digest_size);
1694
1695         return;
1696
1697 failed:
1698         /* this shouldn't happen anyway, the hash functions have no reason to fail */
1699         get_random_bytes(result, ic->tag_size);
1700 }
1701
1702 static void integrity_metadata(struct work_struct *w)
1703 {
1704         struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
1705         struct dm_integrity_c *ic = dio->ic;
1706
1707         int r;
1708
1709         if (ic->internal_hash) {
1710                 struct bvec_iter iter;
1711                 struct bio_vec bv;
1712                 unsigned int digest_size = crypto_shash_digestsize(ic->internal_hash);
1713                 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1714                 char *checksums;
1715                 unsigned int extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0;
1716                 char checksums_onstack[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
1717                 sector_t sector;
1718                 unsigned int sectors_to_process;
1719
1720                 if (unlikely(ic->mode == 'R'))
1721                         goto skip_io;
1722
1723                 if (likely(dio->op != REQ_OP_DISCARD))
1724                         checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT >> ic->sb->log2_sectors_per_block) * ic->tag_size + extra_space,
1725                                             GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
1726                 else
1727                         checksums = kmalloc(PAGE_SIZE, GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
1728                 if (!checksums) {
1729                         checksums = checksums_onstack;
1730                         if (WARN_ON(extra_space &&
1731                                     digest_size > sizeof(checksums_onstack))) {
1732                                 r = -EINVAL;
1733                                 goto error;
1734                         }
1735                 }
1736
1737                 if (unlikely(dio->op == REQ_OP_DISCARD)) {
1738                         unsigned int bi_size = dio->bio_details.bi_iter.bi_size;
1739                         unsigned int max_size = likely(checksums != checksums_onstack) ? PAGE_SIZE : HASH_MAX_DIGESTSIZE;
1740                         unsigned int max_blocks = max_size / ic->tag_size;
1741
1742                         memset(checksums, DISCARD_FILLER, max_size);
1743
1744                         while (bi_size) {
1745                                 unsigned int this_step_blocks = bi_size >> (SECTOR_SHIFT + ic->sb->log2_sectors_per_block);
1746
1747                                 this_step_blocks = min(this_step_blocks, max_blocks);
1748                                 r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1749                                                         this_step_blocks * ic->tag_size, TAG_WRITE);
1750                                 if (unlikely(r)) {
1751                                         if (likely(checksums != checksums_onstack))
1752                                                 kfree(checksums);
1753                                         goto error;
1754                                 }
1755
1756                                 bi_size -= this_step_blocks << (SECTOR_SHIFT + ic->sb->log2_sectors_per_block);
1757                         }
1758
1759                         if (likely(checksums != checksums_onstack))
1760                                 kfree(checksums);
1761                         goto skip_io;
1762                 }
1763
1764                 sector = dio->range.logical_sector;
1765                 sectors_to_process = dio->range.n_sectors;
1766
1767                 __bio_for_each_segment(bv, bio, iter, dio->bio_details.bi_iter) {
1768                         unsigned int pos;
1769                         char *mem, *checksums_ptr;
1770
1771 again:
1772                         mem = bvec_kmap_local(&bv);
1773                         pos = 0;
1774                         checksums_ptr = checksums;
1775                         do {
1776                                 integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr);
1777                                 checksums_ptr += ic->tag_size;
1778                                 sectors_to_process -= ic->sectors_per_block;
1779                                 pos += ic->sectors_per_block << SECTOR_SHIFT;
1780                                 sector += ic->sectors_per_block;
1781                         } while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
1782                         kunmap_local(mem);
1783
1784                         r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1785                                                 checksums_ptr - checksums, dio->op == REQ_OP_READ ? TAG_CMP : TAG_WRITE);
1786                         if (unlikely(r)) {
1787                                 if (r > 0) {
1788                                         sector_t s;
1789
1790                                         s = sector - ((r + ic->tag_size - 1) / ic->tag_size);
1791                                         DMERR_LIMIT("%pg: Checksum failed at sector 0x%llx",
1792                                                     bio->bi_bdev, s);
1793                                         r = -EILSEQ;
1794                                         atomic64_inc(&ic->number_of_mismatches);
1795                                         dm_audit_log_bio(DM_MSG_PREFIX, "integrity-checksum",
1796                                                          bio, s, 0);
1797                                 }
1798                                 if (likely(checksums != checksums_onstack))
1799                                         kfree(checksums);
1800                                 goto error;
1801                         }
1802
1803                         if (!sectors_to_process)
1804                                 break;
1805
1806                         if (unlikely(pos < bv.bv_len)) {
1807                                 bv.bv_offset += pos;
1808                                 bv.bv_len -= pos;
1809                                 goto again;
1810                         }
1811                 }
1812
1813                 if (likely(checksums != checksums_onstack))
1814                         kfree(checksums);
1815         } else {
1816                 struct bio_integrity_payload *bip = dio->bio_details.bi_integrity;
1817
1818                 if (bip) {
1819                         struct bio_vec biv;
1820                         struct bvec_iter iter;
1821                         unsigned int data_to_process = dio->range.n_sectors;
1822
1823                         sector_to_block(ic, data_to_process);
1824                         data_to_process *= ic->tag_size;
1825
1826                         bip_for_each_vec(biv, bip, iter) {
1827                                 unsigned char *tag;
1828                                 unsigned int this_len;
1829
1830                                 BUG_ON(PageHighMem(biv.bv_page));
1831                                 tag = bvec_virt(&biv);
1832                                 this_len = min(biv.bv_len, data_to_process);
1833                                 r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset,
1834                                                         this_len, dio->op == REQ_OP_READ ? TAG_READ : TAG_WRITE);
1835                                 if (unlikely(r))
1836                                         goto error;
1837                                 data_to_process -= this_len;
1838                                 if (!data_to_process)
1839                                         break;
1840                         }
1841                 }
1842         }
1843 skip_io:
1844         dec_in_flight(dio);
1845         return;
1846 error:
1847         dio->bi_status = errno_to_blk_status(r);
1848         dec_in_flight(dio);
1849 }
1850
1851 static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
1852 {
1853         struct dm_integrity_c *ic = ti->private;
1854         struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1855         struct bio_integrity_payload *bip;
1856
1857         sector_t area, offset;
1858
1859         dio->ic = ic;
1860         dio->bi_status = 0;
1861         dio->op = bio_op(bio);
1862
1863         if (unlikely(dio->op == REQ_OP_DISCARD)) {
1864                 if (ti->max_io_len) {
1865                         sector_t sec = dm_target_offset(ti, bio->bi_iter.bi_sector);
1866                         unsigned int log2_max_io_len = __fls(ti->max_io_len);
1867                         sector_t start_boundary = sec >> log2_max_io_len;
1868                         sector_t end_boundary = (sec + bio_sectors(bio) - 1) >> log2_max_io_len;
1869
1870                         if (start_boundary < end_boundary) {
1871                                 sector_t len = ti->max_io_len - (sec & (ti->max_io_len - 1));
1872
1873                                 dm_accept_partial_bio(bio, len);
1874                         }
1875                 }
1876         }
1877
1878         if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
1879                 submit_flush_bio(ic, dio);
1880                 return DM_MAPIO_SUBMITTED;
1881         }
1882
1883         dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector);
1884         dio->fua = dio->op == REQ_OP_WRITE && bio->bi_opf & REQ_FUA;
1885         if (unlikely(dio->fua)) {
1886                 /*
1887                  * Don't pass down the FUA flag because we have to flush
1888                  * disk cache anyway.
1889                  */
1890                 bio->bi_opf &= ~REQ_FUA;
1891         }
1892         if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) {
1893                 DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx",
1894                       dio->range.logical_sector, bio_sectors(bio),
1895                       ic->provided_data_sectors);
1896                 return DM_MAPIO_KILL;
1897         }
1898         if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned int)(ic->sectors_per_block - 1))) {
1899                 DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x",
1900                       ic->sectors_per_block,
1901                       dio->range.logical_sector, bio_sectors(bio));
1902                 return DM_MAPIO_KILL;
1903         }
1904
1905         if (ic->sectors_per_block > 1 && likely(dio->op != REQ_OP_DISCARD)) {
1906                 struct bvec_iter iter;
1907                 struct bio_vec bv;
1908
1909                 bio_for_each_segment(bv, bio, iter) {
1910                         if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
1911                                 DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
1912                                         bv.bv_offset, bv.bv_len, ic->sectors_per_block);
1913                                 return DM_MAPIO_KILL;
1914                         }
1915                 }
1916         }
1917
1918         bip = bio_integrity(bio);
1919         if (!ic->internal_hash) {
1920                 if (bip) {
1921                         unsigned int wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block;
1922
1923                         if (ic->log2_tag_size >= 0)
1924                                 wanted_tag_size <<= ic->log2_tag_size;
1925                         else
1926                                 wanted_tag_size *= ic->tag_size;
1927                         if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) {
1928                                 DMERR("Invalid integrity data size %u, expected %u",
1929                                       bip->bip_iter.bi_size, wanted_tag_size);
1930                                 return DM_MAPIO_KILL;
1931                         }
1932                 }
1933         } else {
1934                 if (unlikely(bip != NULL)) {
1935                         DMERR("Unexpected integrity data when using internal hash");
1936                         return DM_MAPIO_KILL;
1937                 }
1938         }
1939
1940         if (unlikely(ic->mode == 'R') && unlikely(dio->op != REQ_OP_READ))
1941                 return DM_MAPIO_KILL;
1942
1943         get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1944         dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1945         bio->bi_iter.bi_sector = get_data_sector(ic, area, offset);
1946
1947         dm_integrity_map_continue(dio, true);
1948         return DM_MAPIO_SUBMITTED;
1949 }
1950
1951 static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
1952                                  unsigned int journal_section, unsigned int journal_entry)
1953 {
1954         struct dm_integrity_c *ic = dio->ic;
1955         sector_t logical_sector;
1956         unsigned int n_sectors;
1957
1958         logical_sector = dio->range.logical_sector;
1959         n_sectors = dio->range.n_sectors;
1960         do {
1961                 struct bio_vec bv = bio_iovec(bio);
1962                 char *mem;
1963
1964                 if (unlikely(bv.bv_len >> SECTOR_SHIFT > n_sectors))
1965                         bv.bv_len = n_sectors << SECTOR_SHIFT;
1966                 n_sectors -= bv.bv_len >> SECTOR_SHIFT;
1967                 bio_advance_iter(bio, &bio->bi_iter, bv.bv_len);
1968 retry_kmap:
1969                 mem = kmap_local_page(bv.bv_page);
1970                 if (likely(dio->op == REQ_OP_WRITE))
1971                         flush_dcache_page(bv.bv_page);
1972
1973                 do {
1974                         struct journal_entry *je = access_journal_entry(ic, journal_section, journal_entry);
1975
1976                         if (unlikely(dio->op == REQ_OP_READ)) {
1977                                 struct journal_sector *js;
1978                                 char *mem_ptr;
1979                                 unsigned int s;
1980
1981                                 if (unlikely(journal_entry_is_inprogress(je))) {
1982                                         flush_dcache_page(bv.bv_page);
1983                                         kunmap_local(mem);
1984
1985                                         __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
1986                                         goto retry_kmap;
1987                                 }
1988                                 smp_rmb();
1989                                 BUG_ON(journal_entry_get_sector(je) != logical_sector);
1990                                 js = access_journal_data(ic, journal_section, journal_entry);
1991                                 mem_ptr = mem + bv.bv_offset;
1992                                 s = 0;
1993                                 do {
1994                                         memcpy(mem_ptr, js, JOURNAL_SECTOR_DATA);
1995                                         *(commit_id_t *)(mem_ptr + JOURNAL_SECTOR_DATA) = je->last_bytes[s];
1996                                         js++;
1997                                         mem_ptr += 1 << SECTOR_SHIFT;
1998                                 } while (++s < ic->sectors_per_block);
1999 #ifdef INTERNAL_VERIFY
2000                                 if (ic->internal_hash) {
2001                                         char checksums_onstack[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
2002
2003                                         integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack);
2004                                         if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) {
2005                                                 DMERR_LIMIT("Checksum failed when reading from journal, at sector 0x%llx",
2006                                                             logical_sector);
2007                                                 dm_audit_log_bio(DM_MSG_PREFIX, "journal-checksum",
2008                                                                  bio, logical_sector, 0);
2009                                         }
2010                                 }
2011 #endif
2012                         }
2013
2014                         if (!ic->internal_hash) {
2015                                 struct bio_integrity_payload *bip = bio_integrity(bio);
2016                                 unsigned int tag_todo = ic->tag_size;
2017                                 char *tag_ptr = journal_entry_tag(ic, je);
2018
2019                                 if (bip) {
2020                                         do {
2021                                                 struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
2022                                                 unsigned int tag_now = min(biv.bv_len, tag_todo);
2023                                                 char *tag_addr;
2024
2025                                                 BUG_ON(PageHighMem(biv.bv_page));
2026                                                 tag_addr = bvec_virt(&biv);
2027                                                 if (likely(dio->op == REQ_OP_WRITE))
2028                                                         memcpy(tag_ptr, tag_addr, tag_now);
2029                                                 else
2030                                                         memcpy(tag_addr, tag_ptr, tag_now);
2031                                                 bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now);
2032                                                 tag_ptr += tag_now;
2033                                                 tag_todo -= tag_now;
2034                                         } while (unlikely(tag_todo));
2035                                 } else if (likely(dio->op == REQ_OP_WRITE))
2036                                         memset(tag_ptr, 0, tag_todo);
2037                         }
2038
2039                         if (likely(dio->op == REQ_OP_WRITE)) {
2040                                 struct journal_sector *js;
2041                                 unsigned int s;
2042
2043                                 js = access_journal_data(ic, journal_section, journal_entry);
2044                                 memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT);
2045
2046                                 s = 0;
2047                                 do {
2048                                         je->last_bytes[s] = js[s].commit_id;
2049                                 } while (++s < ic->sectors_per_block);
2050
2051                                 if (ic->internal_hash) {
2052                                         unsigned int digest_size = crypto_shash_digestsize(ic->internal_hash);
2053
2054                                         if (unlikely(digest_size > ic->tag_size)) {
2055                                                 char checksums_onstack[HASH_MAX_DIGESTSIZE];
2056
2057                                                 integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack);
2058                                                 memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size);
2059                                         } else
2060                                                 integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je));
2061                                 }
2062
2063                                 journal_entry_set_sector(je, logical_sector);
2064                         }
2065                         logical_sector += ic->sectors_per_block;
2066
2067                         journal_entry++;
2068                         if (unlikely(journal_entry == ic->journal_section_entries)) {
2069                                 journal_entry = 0;
2070                                 journal_section++;
2071                                 wraparound_section(ic, &journal_section);
2072                         }
2073
2074                         bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT;
2075                 } while (bv.bv_len -= ic->sectors_per_block << SECTOR_SHIFT);
2076
2077                 if (unlikely(dio->op == REQ_OP_READ))
2078                         flush_dcache_page(bv.bv_page);
2079                 kunmap_local(mem);
2080         } while (n_sectors);
2081
2082         if (likely(dio->op == REQ_OP_WRITE)) {
2083                 smp_mb();
2084                 if (unlikely(waitqueue_active(&ic->copy_to_journal_wait)))
2085                         wake_up(&ic->copy_to_journal_wait);
2086                 if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold)
2087                         queue_work(ic->commit_wq, &ic->commit_work);
2088                 else
2089                         schedule_autocommit(ic);
2090         } else
2091                 remove_range(ic, &dio->range);
2092
2093         if (unlikely(bio->bi_iter.bi_size)) {
2094                 sector_t area, offset;
2095
2096                 dio->range.logical_sector = logical_sector;
2097                 get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
2098                 dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
2099                 return true;
2100         }
2101
2102         return false;
2103 }
2104
2105 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map)
2106 {
2107         struct dm_integrity_c *ic = dio->ic;
2108         struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
2109         unsigned int journal_section, journal_entry;
2110         unsigned int journal_read_pos;
2111         struct completion read_comp;
2112         bool discard_retried = false;
2113         bool need_sync_io = ic->internal_hash && dio->op == REQ_OP_READ;
2114
2115         if (unlikely(dio->op == REQ_OP_DISCARD) && ic->mode != 'D')
2116                 need_sync_io = true;
2117
2118         if (need_sync_io && from_map) {
2119                 INIT_WORK(&dio->work, integrity_bio_wait);
2120                 queue_work(ic->offload_wq, &dio->work);
2121                 return;
2122         }
2123
2124 lock_retry:
2125         spin_lock_irq(&ic->endio_wait.lock);
2126 retry:
2127         if (unlikely(dm_integrity_failed(ic))) {
2128                 spin_unlock_irq(&ic->endio_wait.lock);
2129                 do_endio(ic, bio);
2130                 return;
2131         }
2132         dio->range.n_sectors = bio_sectors(bio);
2133         journal_read_pos = NOT_FOUND;
2134         if (ic->mode == 'J' && likely(dio->op != REQ_OP_DISCARD)) {
2135                 if (dio->op == REQ_OP_WRITE) {
2136                         unsigned int next_entry, i, pos;
2137                         unsigned int ws, we, range_sectors;
2138
2139                         dio->range.n_sectors = min(dio->range.n_sectors,
2140                                                    (sector_t)ic->free_sectors << ic->sb->log2_sectors_per_block);
2141                         if (unlikely(!dio->range.n_sectors)) {
2142                                 if (from_map)
2143                                         goto offload_to_thread;
2144                                 sleep_on_endio_wait(ic);
2145                                 goto retry;
2146                         }
2147                         range_sectors = dio->range.n_sectors >> ic->sb->log2_sectors_per_block;
2148                         ic->free_sectors -= range_sectors;
2149                         journal_section = ic->free_section;
2150                         journal_entry = ic->free_section_entry;
2151
2152                         next_entry = ic->free_section_entry + range_sectors;
2153                         ic->free_section_entry = next_entry % ic->journal_section_entries;
2154                         ic->free_section += next_entry / ic->journal_section_entries;
2155                         ic->n_uncommitted_sections += next_entry / ic->journal_section_entries;
2156                         wraparound_section(ic, &ic->free_section);
2157
2158                         pos = journal_section * ic->journal_section_entries + journal_entry;
2159                         ws = journal_section;
2160                         we = journal_entry;
2161                         i = 0;
2162                         do {
2163                                 struct journal_entry *je;
2164
2165                                 add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i);
2166                                 pos++;
2167                                 if (unlikely(pos >= ic->journal_entries))
2168                                         pos = 0;
2169
2170                                 je = access_journal_entry(ic, ws, we);
2171                                 BUG_ON(!journal_entry_is_unused(je));
2172                                 journal_entry_set_inprogress(je);
2173                                 we++;
2174                                 if (unlikely(we == ic->journal_section_entries)) {
2175                                         we = 0;
2176                                         ws++;
2177                                         wraparound_section(ic, &ws);
2178                                 }
2179                         } while ((i += ic->sectors_per_block) < dio->range.n_sectors);
2180
2181                         spin_unlock_irq(&ic->endio_wait.lock);
2182                         goto journal_read_write;
2183                 } else {
2184                         sector_t next_sector;
2185
2186                         journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2187                         if (likely(journal_read_pos == NOT_FOUND)) {
2188                                 if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector))
2189                                         dio->range.n_sectors = next_sector - dio->range.logical_sector;
2190                         } else {
2191                                 unsigned int i;
2192                                 unsigned int jp = journal_read_pos + 1;
2193
2194                                 for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) {
2195                                         if (!test_journal_node(ic, jp, dio->range.logical_sector + i))
2196                                                 break;
2197                                 }
2198                                 dio->range.n_sectors = i;
2199                         }
2200                 }
2201         }
2202         if (unlikely(!add_new_range(ic, &dio->range, true))) {
2203                 /*
2204                  * We must not sleep in the request routine because it could
2205                  * stall bios on current->bio_list.
2206                  * So, we offload the bio to a workqueue if we have to sleep.
2207                  */
2208                 if (from_map) {
2209 offload_to_thread:
2210                         spin_unlock_irq(&ic->endio_wait.lock);
2211                         INIT_WORK(&dio->work, integrity_bio_wait);
2212                         queue_work(ic->wait_wq, &dio->work);
2213                         return;
2214                 }
2215                 if (journal_read_pos != NOT_FOUND)
2216                         dio->range.n_sectors = ic->sectors_per_block;
2217                 wait_and_add_new_range(ic, &dio->range);
2218                 /*
2219                  * wait_and_add_new_range drops the spinlock, so the journal
2220                  * may have been changed arbitrarily. We need to recheck.
2221                  * To simplify the code, we restrict I/O size to just one block.
2222                  */
2223                 if (journal_read_pos != NOT_FOUND) {
2224                         sector_t next_sector;
2225                         unsigned int new_pos;
2226
2227                         new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2228                         if (unlikely(new_pos != journal_read_pos)) {
2229                                 remove_range_unlocked(ic, &dio->range);
2230                                 goto retry;
2231                         }
2232                 }
2233         }
2234         if (ic->mode == 'J' && likely(dio->op == REQ_OP_DISCARD) && !discard_retried) {
2235                 sector_t next_sector;
2236                 unsigned int new_pos;
2237
2238                 new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2239                 if (unlikely(new_pos != NOT_FOUND) ||
2240                     unlikely(next_sector < dio->range.logical_sector - dio->range.n_sectors)) {
2241                         remove_range_unlocked(ic, &dio->range);
2242                         spin_unlock_irq(&ic->endio_wait.lock);
2243                         queue_work(ic->commit_wq, &ic->commit_work);
2244                         flush_workqueue(ic->commit_wq);
2245                         queue_work(ic->writer_wq, &ic->writer_work);
2246                         flush_workqueue(ic->writer_wq);
2247                         discard_retried = true;
2248                         goto lock_retry;
2249                 }
2250         }
2251         spin_unlock_irq(&ic->endio_wait.lock);
2252
2253         if (unlikely(journal_read_pos != NOT_FOUND)) {
2254                 journal_section = journal_read_pos / ic->journal_section_entries;
2255                 journal_entry = journal_read_pos % ic->journal_section_entries;
2256                 goto journal_read_write;
2257         }
2258
2259         if (ic->mode == 'B' && (dio->op == REQ_OP_WRITE || unlikely(dio->op == REQ_OP_DISCARD))) {
2260                 if (!block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2261                                      dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
2262                         struct bitmap_block_status *bbs;
2263
2264                         bbs = sector_to_bitmap_block(ic, dio->range.logical_sector);
2265                         spin_lock(&bbs->bio_queue_lock);
2266                         bio_list_add(&bbs->bio_queue, bio);
2267                         spin_unlock(&bbs->bio_queue_lock);
2268                         queue_work(ic->writer_wq, &bbs->work);
2269                         return;
2270                 }
2271         }
2272
2273         dio->in_flight = (atomic_t)ATOMIC_INIT(2);
2274
2275         if (need_sync_io) {
2276                 init_completion(&read_comp);
2277                 dio->completion = &read_comp;
2278         } else
2279                 dio->completion = NULL;
2280
2281         dm_bio_record(&dio->bio_details, bio);
2282         bio_set_dev(bio, ic->dev->bdev);
2283         bio->bi_integrity = NULL;
2284         bio->bi_opf &= ~REQ_INTEGRITY;
2285         bio->bi_end_io = integrity_end_io;
2286         bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT;
2287
2288         if (unlikely(dio->op == REQ_OP_DISCARD) && likely(ic->mode != 'D')) {
2289                 integrity_metadata(&dio->work);
2290                 dm_integrity_flush_buffers(ic, false);
2291
2292                 dio->in_flight = (atomic_t)ATOMIC_INIT(1);
2293                 dio->completion = NULL;
2294
2295                 submit_bio_noacct(bio);
2296
2297                 return;
2298         }
2299
2300         submit_bio_noacct(bio);
2301
2302         if (need_sync_io) {
2303                 wait_for_completion_io(&read_comp);
2304                 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
2305                     dio->range.logical_sector + dio->range.n_sectors > le64_to_cpu(ic->sb->recalc_sector))
2306                         goto skip_check;
2307                 if (ic->mode == 'B') {
2308                         if (!block_bitmap_op(ic, ic->recalc_bitmap, dio->range.logical_sector,
2309                                              dio->range.n_sectors, BITMAP_OP_TEST_ALL_CLEAR))
2310                                 goto skip_check;
2311                 }
2312
2313                 if (likely(!bio->bi_status))
2314                         integrity_metadata(&dio->work);
2315                 else
2316 skip_check:
2317                         dec_in_flight(dio);
2318         } else {
2319                 INIT_WORK(&dio->work, integrity_metadata);
2320                 queue_work(ic->metadata_wq, &dio->work);
2321         }
2322
2323         return;
2324
2325 journal_read_write:
2326         if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry)))
2327                 goto lock_retry;
2328
2329         do_endio_flush(ic, dio);
2330 }
2331
2332
2333 static void integrity_bio_wait(struct work_struct *w)
2334 {
2335         struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
2336
2337         dm_integrity_map_continue(dio, false);
2338 }
2339
2340 static void pad_uncommitted(struct dm_integrity_c *ic)
2341 {
2342         if (ic->free_section_entry) {
2343                 ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry;
2344                 ic->free_section_entry = 0;
2345                 ic->free_section++;
2346                 wraparound_section(ic, &ic->free_section);
2347                 ic->n_uncommitted_sections++;
2348         }
2349         if (WARN_ON(ic->journal_sections * ic->journal_section_entries !=
2350                     (ic->n_uncommitted_sections + ic->n_committed_sections) *
2351                     ic->journal_section_entries + ic->free_sectors)) {
2352                 DMCRIT("journal_sections %u, journal_section_entries %u, "
2353                        "n_uncommitted_sections %u, n_committed_sections %u, "
2354                        "journal_section_entries %u, free_sectors %u",
2355                        ic->journal_sections, ic->journal_section_entries,
2356                        ic->n_uncommitted_sections, ic->n_committed_sections,
2357                        ic->journal_section_entries, ic->free_sectors);
2358         }
2359 }
2360
2361 static void integrity_commit(struct work_struct *w)
2362 {
2363         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work);
2364         unsigned int commit_start, commit_sections;
2365         unsigned int i, j, n;
2366         struct bio *flushes;
2367
2368         del_timer(&ic->autocommit_timer);
2369
2370         spin_lock_irq(&ic->endio_wait.lock);
2371         flushes = bio_list_get(&ic->flush_bio_list);
2372         if (unlikely(ic->mode != 'J')) {
2373                 spin_unlock_irq(&ic->endio_wait.lock);
2374                 dm_integrity_flush_buffers(ic, true);
2375                 goto release_flush_bios;
2376         }
2377
2378         pad_uncommitted(ic);
2379         commit_start = ic->uncommitted_section;
2380         commit_sections = ic->n_uncommitted_sections;
2381         spin_unlock_irq(&ic->endio_wait.lock);
2382
2383         if (!commit_sections)
2384                 goto release_flush_bios;
2385
2386         ic->wrote_to_journal = true;
2387
2388         i = commit_start;
2389         for (n = 0; n < commit_sections; n++) {
2390                 for (j = 0; j < ic->journal_section_entries; j++) {
2391                         struct journal_entry *je;
2392
2393                         je = access_journal_entry(ic, i, j);
2394                         io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
2395                 }
2396                 for (j = 0; j < ic->journal_section_sectors; j++) {
2397                         struct journal_sector *js;
2398
2399                         js = access_journal(ic, i, j);
2400                         js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq);
2401                 }
2402                 i++;
2403                 if (unlikely(i >= ic->journal_sections))
2404                         ic->commit_seq = next_commit_seq(ic->commit_seq);
2405                 wraparound_section(ic, &i);
2406         }
2407         smp_rmb();
2408
2409         write_journal(ic, commit_start, commit_sections);
2410
2411         spin_lock_irq(&ic->endio_wait.lock);
2412         ic->uncommitted_section += commit_sections;
2413         wraparound_section(ic, &ic->uncommitted_section);
2414         ic->n_uncommitted_sections -= commit_sections;
2415         ic->n_committed_sections += commit_sections;
2416         spin_unlock_irq(&ic->endio_wait.lock);
2417
2418         if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold)
2419                 queue_work(ic->writer_wq, &ic->writer_work);
2420
2421 release_flush_bios:
2422         while (flushes) {
2423                 struct bio *next = flushes->bi_next;
2424
2425                 flushes->bi_next = NULL;
2426                 do_endio(ic, flushes);
2427                 flushes = next;
2428         }
2429 }
2430
2431 static void complete_copy_from_journal(unsigned long error, void *context)
2432 {
2433         struct journal_io *io = context;
2434         struct journal_completion *comp = io->comp;
2435         struct dm_integrity_c *ic = comp->ic;
2436
2437         remove_range(ic, &io->range);
2438         mempool_free(io, &ic->journal_io_mempool);
2439         if (unlikely(error != 0))
2440                 dm_integrity_io_error(ic, "copying from journal", -EIO);
2441         complete_journal_op(comp);
2442 }
2443
2444 static void restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js,
2445                                struct journal_entry *je)
2446 {
2447         unsigned int s = 0;
2448
2449         do {
2450                 js->commit_id = je->last_bytes[s];
2451                 js++;
2452         } while (++s < ic->sectors_per_block);
2453 }
2454
2455 static void do_journal_write(struct dm_integrity_c *ic, unsigned int write_start,
2456                              unsigned int write_sections, bool from_replay)
2457 {
2458         unsigned int i, j, n;
2459         struct journal_completion comp;
2460         struct blk_plug plug;
2461
2462         blk_start_plug(&plug);
2463
2464         comp.ic = ic;
2465         comp.in_flight = (atomic_t)ATOMIC_INIT(1);
2466         init_completion(&comp.comp);
2467
2468         i = write_start;
2469         for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) {
2470 #ifndef INTERNAL_VERIFY
2471                 if (unlikely(from_replay))
2472 #endif
2473                         rw_section_mac(ic, i, false);
2474                 for (j = 0; j < ic->journal_section_entries; j++) {
2475                         struct journal_entry *je = access_journal_entry(ic, i, j);
2476                         sector_t sec, area, offset;
2477                         unsigned int k, l, next_loop;
2478                         sector_t metadata_block;
2479                         unsigned int metadata_offset;
2480                         struct journal_io *io;
2481
2482                         if (journal_entry_is_unused(je))
2483                                 continue;
2484                         BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay);
2485                         sec = journal_entry_get_sector(je);
2486                         if (unlikely(from_replay)) {
2487                                 if (unlikely(sec & (unsigned int)(ic->sectors_per_block - 1))) {
2488                                         dm_integrity_io_error(ic, "invalid sector in journal", -EIO);
2489                                         sec &= ~(sector_t)(ic->sectors_per_block - 1);
2490                                 }
2491                                 if (unlikely(sec >= ic->provided_data_sectors)) {
2492                                         journal_entry_set_unused(je);
2493                                         continue;
2494                                 }
2495                         }
2496                         get_area_and_offset(ic, sec, &area, &offset);
2497                         restore_last_bytes(ic, access_journal_data(ic, i, j), je);
2498                         for (k = j + 1; k < ic->journal_section_entries; k++) {
2499                                 struct journal_entry *je2 = access_journal_entry(ic, i, k);
2500                                 sector_t sec2, area2, offset2;
2501
2502                                 if (journal_entry_is_unused(je2))
2503                                         break;
2504                                 BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay);
2505                                 sec2 = journal_entry_get_sector(je2);
2506                                 if (unlikely(sec2 >= ic->provided_data_sectors))
2507                                         break;
2508                                 get_area_and_offset(ic, sec2, &area2, &offset2);
2509                                 if (area2 != area || offset2 != offset + ((k - j) << ic->sb->log2_sectors_per_block))
2510                                         break;
2511                                 restore_last_bytes(ic, access_journal_data(ic, i, k), je2);
2512                         }
2513                         next_loop = k - 1;
2514
2515                         io = mempool_alloc(&ic->journal_io_mempool, GFP_NOIO);
2516                         io->comp = &comp;
2517                         io->range.logical_sector = sec;
2518                         io->range.n_sectors = (k - j) << ic->sb->log2_sectors_per_block;
2519
2520                         spin_lock_irq(&ic->endio_wait.lock);
2521                         add_new_range_and_wait(ic, &io->range);
2522
2523                         if (likely(!from_replay)) {
2524                                 struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries];
2525
2526                                 /* don't write if there is newer committed sector */
2527                                 while (j < k && find_newer_committed_node(ic, &section_node[j])) {
2528                                         struct journal_entry *je2 = access_journal_entry(ic, i, j);
2529
2530                                         journal_entry_set_unused(je2);
2531                                         remove_journal_node(ic, &section_node[j]);
2532                                         j++;
2533                                         sec += ic->sectors_per_block;
2534                                         offset += ic->sectors_per_block;
2535                                 }
2536                                 while (j < k && find_newer_committed_node(ic, &section_node[k - 1])) {
2537                                         struct journal_entry *je2 = access_journal_entry(ic, i, k - 1);
2538
2539                                         journal_entry_set_unused(je2);
2540                                         remove_journal_node(ic, &section_node[k - 1]);
2541                                         k--;
2542                                 }
2543                                 if (j == k) {
2544                                         remove_range_unlocked(ic, &io->range);
2545                                         spin_unlock_irq(&ic->endio_wait.lock);
2546                                         mempool_free(io, &ic->journal_io_mempool);
2547                                         goto skip_io;
2548                                 }
2549                                 for (l = j; l < k; l++)
2550                                         remove_journal_node(ic, &section_node[l]);
2551                         }
2552                         spin_unlock_irq(&ic->endio_wait.lock);
2553
2554                         metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2555                         for (l = j; l < k; l++) {
2556                                 int r;
2557                                 struct journal_entry *je2 = access_journal_entry(ic, i, l);
2558
2559                                 if (
2560 #ifndef INTERNAL_VERIFY
2561                                     unlikely(from_replay) &&
2562 #endif
2563                                     ic->internal_hash) {
2564                                         char test_tag[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
2565
2566                                         integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block),
2567                                                                   (char *)access_journal_data(ic, i, l), test_tag);
2568                                         if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size))) {
2569                                                 dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ);
2570                                                 dm_audit_log_target(DM_MSG_PREFIX, "integrity-replay-journal", ic->ti, 0);
2571                                         }
2572                                 }
2573
2574                                 journal_entry_set_unused(je2);
2575                                 r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset,
2576                                                         ic->tag_size, TAG_WRITE);
2577                                 if (unlikely(r))
2578                                         dm_integrity_io_error(ic, "reading tags", r);
2579                         }
2580
2581                         atomic_inc(&comp.in_flight);
2582                         copy_from_journal(ic, i, j << ic->sb->log2_sectors_per_block,
2583                                           (k - j) << ic->sb->log2_sectors_per_block,
2584                                           get_data_sector(ic, area, offset),
2585                                           complete_copy_from_journal, io);
2586 skip_io:
2587                         j = next_loop;
2588                 }
2589         }
2590
2591         dm_bufio_write_dirty_buffers_async(ic->bufio);
2592
2593         blk_finish_plug(&plug);
2594
2595         complete_journal_op(&comp);
2596         wait_for_completion_io(&comp.comp);
2597
2598         dm_integrity_flush_buffers(ic, true);
2599 }
2600
2601 static void integrity_writer(struct work_struct *w)
2602 {
2603         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work);
2604         unsigned int write_start, write_sections;
2605         unsigned int prev_free_sectors;
2606
2607         spin_lock_irq(&ic->endio_wait.lock);
2608         write_start = ic->committed_section;
2609         write_sections = ic->n_committed_sections;
2610         spin_unlock_irq(&ic->endio_wait.lock);
2611
2612         if (!write_sections)
2613                 return;
2614
2615         do_journal_write(ic, write_start, write_sections, false);
2616
2617         spin_lock_irq(&ic->endio_wait.lock);
2618
2619         ic->committed_section += write_sections;
2620         wraparound_section(ic, &ic->committed_section);
2621         ic->n_committed_sections -= write_sections;
2622
2623         prev_free_sectors = ic->free_sectors;
2624         ic->free_sectors += write_sections * ic->journal_section_entries;
2625         if (unlikely(!prev_free_sectors))
2626                 wake_up_locked(&ic->endio_wait);
2627
2628         spin_unlock_irq(&ic->endio_wait.lock);
2629 }
2630
2631 static void recalc_write_super(struct dm_integrity_c *ic)
2632 {
2633         int r;
2634
2635         dm_integrity_flush_buffers(ic, false);
2636         if (dm_integrity_failed(ic))
2637                 return;
2638
2639         r = sync_rw_sb(ic, REQ_OP_WRITE);
2640         if (unlikely(r))
2641                 dm_integrity_io_error(ic, "writing superblock", r);
2642 }
2643
2644 static void integrity_recalc(struct work_struct *w)
2645 {
2646         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, recalc_work);
2647         size_t recalc_tags_size;
2648         u8 *recalc_buffer = NULL;
2649         u8 *recalc_tags = NULL;
2650         struct dm_integrity_range range;
2651         struct dm_io_request io_req;
2652         struct dm_io_region io_loc;
2653         sector_t area, offset;
2654         sector_t metadata_block;
2655         unsigned int metadata_offset;
2656         sector_t logical_sector, n_sectors;
2657         __u8 *t;
2658         unsigned int i;
2659         int r;
2660         unsigned int super_counter = 0;
2661         unsigned recalc_sectors = RECALC_SECTORS;
2662
2663 retry:
2664         recalc_buffer = __vmalloc(recalc_sectors << SECTOR_SHIFT, GFP_NOIO);
2665         if (!recalc_buffer) {
2666 oom:
2667                 recalc_sectors >>= 1;
2668                 if (recalc_sectors >= 1U << ic->sb->log2_sectors_per_block)
2669                         goto retry;
2670                 DMCRIT("out of memory for recalculate buffer - recalculation disabled");
2671                 goto free_ret;
2672         }
2673         recalc_tags_size = (recalc_sectors >> ic->sb->log2_sectors_per_block) * ic->tag_size;
2674         if (crypto_shash_digestsize(ic->internal_hash) > ic->tag_size)
2675                 recalc_tags_size += crypto_shash_digestsize(ic->internal_hash) - ic->tag_size;
2676         recalc_tags = kvmalloc(recalc_tags_size, GFP_NOIO);
2677         if (!recalc_tags) {
2678                 vfree(recalc_buffer);
2679                 recalc_buffer = NULL;
2680                 goto oom;
2681         }
2682
2683         DEBUG_print("start recalculation... (position %llx)\n", le64_to_cpu(ic->sb->recalc_sector));
2684
2685         spin_lock_irq(&ic->endio_wait.lock);
2686
2687 next_chunk:
2688
2689         if (unlikely(dm_post_suspending(ic->ti)))
2690                 goto unlock_ret;
2691
2692         range.logical_sector = le64_to_cpu(ic->sb->recalc_sector);
2693         if (unlikely(range.logical_sector >= ic->provided_data_sectors)) {
2694                 if (ic->mode == 'B') {
2695                         block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
2696                         DEBUG_print("queue_delayed_work: bitmap_flush_work\n");
2697                         queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
2698                 }
2699                 goto unlock_ret;
2700         }
2701
2702         get_area_and_offset(ic, range.logical_sector, &area, &offset);
2703         range.n_sectors = min((sector_t)recalc_sectors, ic->provided_data_sectors - range.logical_sector);
2704         if (!ic->meta_dev)
2705                 range.n_sectors = min(range.n_sectors, ((sector_t)1U << ic->sb->log2_interleave_sectors) - (unsigned int)offset);
2706
2707         add_new_range_and_wait(ic, &range);
2708         spin_unlock_irq(&ic->endio_wait.lock);
2709         logical_sector = range.logical_sector;
2710         n_sectors = range.n_sectors;
2711
2712         if (ic->mode == 'B') {
2713                 if (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector, n_sectors, BITMAP_OP_TEST_ALL_CLEAR))
2714                         goto advance_and_next;
2715
2716                 while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector,
2717                                        ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
2718                         logical_sector += ic->sectors_per_block;
2719                         n_sectors -= ic->sectors_per_block;
2720                         cond_resched();
2721                 }
2722                 while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector + n_sectors - ic->sectors_per_block,
2723                                        ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
2724                         n_sectors -= ic->sectors_per_block;
2725                         cond_resched();
2726                 }
2727                 get_area_and_offset(ic, logical_sector, &area, &offset);
2728         }
2729
2730         DEBUG_print("recalculating: %llx, %llx\n", logical_sector, n_sectors);
2731
2732         if (unlikely(++super_counter == RECALC_WRITE_SUPER)) {
2733                 recalc_write_super(ic);
2734                 if (ic->mode == 'B')
2735                         queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2736
2737                 super_counter = 0;
2738         }
2739
2740         if (unlikely(dm_integrity_failed(ic)))
2741                 goto err;
2742
2743         io_req.bi_opf = REQ_OP_READ;
2744         io_req.mem.type = DM_IO_VMA;
2745         io_req.mem.ptr.addr = recalc_buffer;
2746         io_req.notify.fn = NULL;
2747         io_req.client = ic->io;
2748         io_loc.bdev = ic->dev->bdev;
2749         io_loc.sector = get_data_sector(ic, area, offset);
2750         io_loc.count = n_sectors;
2751
2752         r = dm_io(&io_req, 1, &io_loc, NULL);
2753         if (unlikely(r)) {
2754                 dm_integrity_io_error(ic, "reading data", r);
2755                 goto err;
2756         }
2757
2758         t = recalc_tags;
2759         for (i = 0; i < n_sectors; i += ic->sectors_per_block) {
2760                 integrity_sector_checksum(ic, logical_sector + i, recalc_buffer + (i << SECTOR_SHIFT), t);
2761                 t += ic->tag_size;
2762         }
2763
2764         metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2765
2766         r = dm_integrity_rw_tag(ic, recalc_tags, &metadata_block, &metadata_offset, t - recalc_tags, TAG_WRITE);
2767         if (unlikely(r)) {
2768                 dm_integrity_io_error(ic, "writing tags", r);
2769                 goto err;
2770         }
2771
2772         if (ic->mode == 'B') {
2773                 sector_t start, end;
2774
2775                 start = (range.logical_sector >>
2776                          (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)) <<
2777                         (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2778                 end = ((range.logical_sector + range.n_sectors) >>
2779                        (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)) <<
2780                         (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2781                 block_bitmap_op(ic, ic->recalc_bitmap, start, end - start, BITMAP_OP_CLEAR);
2782         }
2783
2784 advance_and_next:
2785         cond_resched();
2786
2787         spin_lock_irq(&ic->endio_wait.lock);
2788         remove_range_unlocked(ic, &range);
2789         ic->sb->recalc_sector = cpu_to_le64(range.logical_sector + range.n_sectors);
2790         goto next_chunk;
2791
2792 err:
2793         remove_range(ic, &range);
2794         goto free_ret;
2795
2796 unlock_ret:
2797         spin_unlock_irq(&ic->endio_wait.lock);
2798
2799         recalc_write_super(ic);
2800
2801 free_ret:
2802         vfree(recalc_buffer);
2803         kvfree(recalc_tags);
2804 }
2805
2806 static void bitmap_block_work(struct work_struct *w)
2807 {
2808         struct bitmap_block_status *bbs = container_of(w, struct bitmap_block_status, work);
2809         struct dm_integrity_c *ic = bbs->ic;
2810         struct bio *bio;
2811         struct bio_list bio_queue;
2812         struct bio_list waiting;
2813
2814         bio_list_init(&waiting);
2815
2816         spin_lock(&bbs->bio_queue_lock);
2817         bio_queue = bbs->bio_queue;
2818         bio_list_init(&bbs->bio_queue);
2819         spin_unlock(&bbs->bio_queue_lock);
2820
2821         while ((bio = bio_list_pop(&bio_queue))) {
2822                 struct dm_integrity_io *dio;
2823
2824                 dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2825
2826                 if (block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2827                                     dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
2828                         remove_range(ic, &dio->range);
2829                         INIT_WORK(&dio->work, integrity_bio_wait);
2830                         queue_work(ic->offload_wq, &dio->work);
2831                 } else {
2832                         block_bitmap_op(ic, ic->journal, dio->range.logical_sector,
2833                                         dio->range.n_sectors, BITMAP_OP_SET);
2834                         bio_list_add(&waiting, bio);
2835                 }
2836         }
2837
2838         if (bio_list_empty(&waiting))
2839                 return;
2840
2841         rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC,
2842                            bbs->idx * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT),
2843                            BITMAP_BLOCK_SIZE >> SECTOR_SHIFT, NULL);
2844
2845         while ((bio = bio_list_pop(&waiting))) {
2846                 struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2847
2848                 block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2849                                 dio->range.n_sectors, BITMAP_OP_SET);
2850
2851                 remove_range(ic, &dio->range);
2852                 INIT_WORK(&dio->work, integrity_bio_wait);
2853                 queue_work(ic->offload_wq, &dio->work);
2854         }
2855
2856         queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2857 }
2858
2859 static void bitmap_flush_work(struct work_struct *work)
2860 {
2861         struct dm_integrity_c *ic = container_of(work, struct dm_integrity_c, bitmap_flush_work.work);
2862         struct dm_integrity_range range;
2863         unsigned long limit;
2864         struct bio *bio;
2865
2866         dm_integrity_flush_buffers(ic, false);
2867
2868         range.logical_sector = 0;
2869         range.n_sectors = ic->provided_data_sectors;
2870
2871         spin_lock_irq(&ic->endio_wait.lock);
2872         add_new_range_and_wait(ic, &range);
2873         spin_unlock_irq(&ic->endio_wait.lock);
2874
2875         dm_integrity_flush_buffers(ic, true);
2876
2877         limit = ic->provided_data_sectors;
2878         if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
2879                 limit = le64_to_cpu(ic->sb->recalc_sector)
2880                         >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)
2881                         << (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2882         }
2883         /*DEBUG_print("zeroing journal\n");*/
2884         block_bitmap_op(ic, ic->journal, 0, limit, BITMAP_OP_CLEAR);
2885         block_bitmap_op(ic, ic->may_write_bitmap, 0, limit, BITMAP_OP_CLEAR);
2886
2887         rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0,
2888                            ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2889
2890         spin_lock_irq(&ic->endio_wait.lock);
2891         remove_range_unlocked(ic, &range);
2892         while (unlikely((bio = bio_list_pop(&ic->synchronous_bios)) != NULL)) {
2893                 bio_endio(bio);
2894                 spin_unlock_irq(&ic->endio_wait.lock);
2895                 spin_lock_irq(&ic->endio_wait.lock);
2896         }
2897         spin_unlock_irq(&ic->endio_wait.lock);
2898 }
2899
2900
2901 static void init_journal(struct dm_integrity_c *ic, unsigned int start_section,
2902                          unsigned int n_sections, unsigned char commit_seq)
2903 {
2904         unsigned int i, j, n;
2905
2906         if (!n_sections)
2907                 return;
2908
2909         for (n = 0; n < n_sections; n++) {
2910                 i = start_section + n;
2911                 wraparound_section(ic, &i);
2912                 for (j = 0; j < ic->journal_section_sectors; j++) {
2913                         struct journal_sector *js = access_journal(ic, i, j);
2914
2915                         BUILD_BUG_ON(sizeof(js->sectors) != JOURNAL_SECTOR_DATA);
2916                         memset(&js->sectors, 0, sizeof(js->sectors));
2917                         js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq);
2918                 }
2919                 for (j = 0; j < ic->journal_section_entries; j++) {
2920                         struct journal_entry *je = access_journal_entry(ic, i, j);
2921
2922                         journal_entry_set_unused(je);
2923                 }
2924         }
2925
2926         write_journal(ic, start_section, n_sections);
2927 }
2928
2929 static int find_commit_seq(struct dm_integrity_c *ic, unsigned int i, unsigned int j, commit_id_t id)
2930 {
2931         unsigned char k;
2932
2933         for (k = 0; k < N_COMMIT_IDS; k++) {
2934                 if (dm_integrity_commit_id(ic, i, j, k) == id)
2935                         return k;
2936         }
2937         dm_integrity_io_error(ic, "journal commit id", -EIO);
2938         return -EIO;
2939 }
2940
2941 static void replay_journal(struct dm_integrity_c *ic)
2942 {
2943         unsigned int i, j;
2944         bool used_commit_ids[N_COMMIT_IDS];
2945         unsigned int max_commit_id_sections[N_COMMIT_IDS];
2946         unsigned int write_start, write_sections;
2947         unsigned int continue_section;
2948         bool journal_empty;
2949         unsigned char unused, last_used, want_commit_seq;
2950
2951         if (ic->mode == 'R')
2952                 return;
2953
2954         if (ic->journal_uptodate)
2955                 return;
2956
2957         last_used = 0;
2958         write_start = 0;
2959
2960         if (!ic->just_formatted) {
2961                 DEBUG_print("reading journal\n");
2962                 rw_journal(ic, REQ_OP_READ, 0, ic->journal_sections, NULL);
2963                 if (ic->journal_io)
2964                         DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal");
2965                 if (ic->journal_io) {
2966                         struct journal_completion crypt_comp;
2967
2968                         crypt_comp.ic = ic;
2969                         init_completion(&crypt_comp.comp);
2970                         crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0);
2971                         encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp);
2972                         wait_for_completion(&crypt_comp.comp);
2973                 }
2974                 DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal");
2975         }
2976
2977         if (dm_integrity_failed(ic))
2978                 goto clear_journal;
2979
2980         journal_empty = true;
2981         memset(used_commit_ids, 0, sizeof(used_commit_ids));
2982         memset(max_commit_id_sections, 0, sizeof(max_commit_id_sections));
2983         for (i = 0; i < ic->journal_sections; i++) {
2984                 for (j = 0; j < ic->journal_section_sectors; j++) {
2985                         int k;
2986                         struct journal_sector *js = access_journal(ic, i, j);
2987
2988                         k = find_commit_seq(ic, i, j, js->commit_id);
2989                         if (k < 0)
2990                                 goto clear_journal;
2991                         used_commit_ids[k] = true;
2992                         max_commit_id_sections[k] = i;
2993                 }
2994                 if (journal_empty) {
2995                         for (j = 0; j < ic->journal_section_entries; j++) {
2996                                 struct journal_entry *je = access_journal_entry(ic, i, j);
2997
2998                                 if (!journal_entry_is_unused(je)) {
2999                                         journal_empty = false;
3000                                         break;
3001                                 }
3002                         }
3003                 }
3004         }
3005
3006         if (!used_commit_ids[N_COMMIT_IDS - 1]) {
3007                 unused = N_COMMIT_IDS - 1;
3008                 while (unused && !used_commit_ids[unused - 1])
3009                         unused--;
3010         } else {
3011                 for (unused = 0; unused < N_COMMIT_IDS; unused++)
3012                         if (!used_commit_ids[unused])
3013                                 break;
3014                 if (unused == N_COMMIT_IDS) {
3015                         dm_integrity_io_error(ic, "journal commit ids", -EIO);
3016                         goto clear_journal;
3017                 }
3018         }
3019         DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n",
3020                     unused, used_commit_ids[0], used_commit_ids[1],
3021                     used_commit_ids[2], used_commit_ids[3]);
3022
3023         last_used = prev_commit_seq(unused);
3024         want_commit_seq = prev_commit_seq(last_used);
3025
3026         if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)])
3027                 journal_empty = true;
3028
3029         write_start = max_commit_id_sections[last_used] + 1;
3030         if (unlikely(write_start >= ic->journal_sections))
3031                 want_commit_seq = next_commit_seq(want_commit_seq);
3032         wraparound_section(ic, &write_start);
3033
3034         i = write_start;
3035         for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) {
3036                 for (j = 0; j < ic->journal_section_sectors; j++) {
3037                         struct journal_sector *js = access_journal(ic, i, j);
3038
3039                         if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) {
3040                                 /*
3041                                  * This could be caused by crash during writing.
3042                                  * We won't replay the inconsistent part of the
3043                                  * journal.
3044                                  */
3045                                 DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n",
3046                                             i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq);
3047                                 goto brk;
3048                         }
3049                 }
3050                 i++;
3051                 if (unlikely(i >= ic->journal_sections))
3052                         want_commit_seq = next_commit_seq(want_commit_seq);
3053                 wraparound_section(ic, &i);
3054         }
3055 brk:
3056
3057         if (!journal_empty) {
3058                 DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n",
3059                             write_sections, write_start, want_commit_seq);
3060                 do_journal_write(ic, write_start, write_sections, true);
3061         }
3062
3063         if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) {
3064                 continue_section = write_start;
3065                 ic->commit_seq = want_commit_seq;
3066                 DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq);
3067         } else {
3068                 unsigned int s;
3069                 unsigned char erase_seq;
3070
3071 clear_journal:
3072                 DEBUG_print("clearing journal\n");
3073
3074                 erase_seq = prev_commit_seq(prev_commit_seq(last_used));
3075                 s = write_start;
3076                 init_journal(ic, s, 1, erase_seq);
3077                 s++;
3078                 wraparound_section(ic, &s);
3079                 if (ic->journal_sections >= 2) {
3080                         init_journal(ic, s, ic->journal_sections - 2, erase_seq);
3081                         s += ic->journal_sections - 2;
3082                         wraparound_section(ic, &s);
3083                         init_journal(ic, s, 1, erase_seq);
3084                 }
3085
3086                 continue_section = 0;
3087                 ic->commit_seq = next_commit_seq(erase_seq);
3088         }
3089
3090         ic->committed_section = continue_section;
3091         ic->n_committed_sections = 0;
3092
3093         ic->uncommitted_section = continue_section;
3094         ic->n_uncommitted_sections = 0;
3095
3096         ic->free_section = continue_section;
3097         ic->free_section_entry = 0;
3098         ic->free_sectors = ic->journal_entries;
3099
3100         ic->journal_tree_root = RB_ROOT;
3101         for (i = 0; i < ic->journal_entries; i++)
3102                 init_journal_node(&ic->journal_tree[i]);
3103 }
3104
3105 static void dm_integrity_enter_synchronous_mode(struct dm_integrity_c *ic)
3106 {
3107         DEBUG_print("%s\n", __func__);
3108
3109         if (ic->mode == 'B') {
3110                 ic->bitmap_flush_interval = msecs_to_jiffies(10) + 1;
3111                 ic->synchronous_mode = 1;
3112
3113                 cancel_delayed_work_sync(&ic->bitmap_flush_work);
3114                 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
3115                 flush_workqueue(ic->commit_wq);
3116         }
3117 }
3118
3119 static int dm_integrity_reboot(struct notifier_block *n, unsigned long code, void *x)
3120 {
3121         struct dm_integrity_c *ic = container_of(n, struct dm_integrity_c, reboot_notifier);
3122
3123         DEBUG_print("%s\n", __func__);
3124
3125         dm_integrity_enter_synchronous_mode(ic);
3126
3127         return NOTIFY_DONE;
3128 }
3129
3130 static void dm_integrity_postsuspend(struct dm_target *ti)
3131 {
3132         struct dm_integrity_c *ic = ti->private;
3133         int r;
3134
3135         WARN_ON(unregister_reboot_notifier(&ic->reboot_notifier));
3136
3137         del_timer_sync(&ic->autocommit_timer);
3138
3139         if (ic->recalc_wq)
3140                 drain_workqueue(ic->recalc_wq);
3141
3142         if (ic->mode == 'B')
3143                 cancel_delayed_work_sync(&ic->bitmap_flush_work);
3144
3145         queue_work(ic->commit_wq, &ic->commit_work);
3146         drain_workqueue(ic->commit_wq);
3147
3148         if (ic->mode == 'J') {
3149                 queue_work(ic->writer_wq, &ic->writer_work);
3150                 drain_workqueue(ic->writer_wq);
3151                 dm_integrity_flush_buffers(ic, true);
3152                 if (ic->wrote_to_journal) {
3153                         init_journal(ic, ic->free_section,
3154                                      ic->journal_sections - ic->free_section, ic->commit_seq);
3155                         if (ic->free_section) {
3156                                 init_journal(ic, 0, ic->free_section,
3157                                              next_commit_seq(ic->commit_seq));
3158                         }
3159                 }
3160         }
3161
3162         if (ic->mode == 'B') {
3163                 dm_integrity_flush_buffers(ic, true);
3164 #if 1
3165                 /* set to 0 to test bitmap replay code */
3166                 init_journal(ic, 0, ic->journal_sections, 0);
3167                 ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3168                 r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA);
3169                 if (unlikely(r))
3170                         dm_integrity_io_error(ic, "writing superblock", r);
3171 #endif
3172         }
3173
3174         BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
3175
3176         ic->journal_uptodate = true;
3177 }
3178
3179 static void dm_integrity_resume(struct dm_target *ti)
3180 {
3181         struct dm_integrity_c *ic = ti->private;
3182         __u64 old_provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
3183         int r;
3184
3185         DEBUG_print("resume\n");
3186
3187         ic->wrote_to_journal = false;
3188
3189         if (ic->provided_data_sectors != old_provided_data_sectors) {
3190                 if (ic->provided_data_sectors > old_provided_data_sectors &&
3191                     ic->mode == 'B' &&
3192                     ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) {
3193                         rw_journal_sectors(ic, REQ_OP_READ, 0,
3194                                            ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3195                         block_bitmap_op(ic, ic->journal, old_provided_data_sectors,
3196                                         ic->provided_data_sectors - old_provided_data_sectors, BITMAP_OP_SET);
3197                         rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0,
3198                                            ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3199                 }
3200
3201                 ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
3202                 r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA);
3203                 if (unlikely(r))
3204                         dm_integrity_io_error(ic, "writing superblock", r);
3205         }
3206
3207         if (ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP)) {
3208                 DEBUG_print("resume dirty_bitmap\n");
3209                 rw_journal_sectors(ic, REQ_OP_READ, 0,
3210                                    ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3211                 if (ic->mode == 'B') {
3212                         if (ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
3213                             !ic->reset_recalculate_flag) {
3214                                 block_bitmap_copy(ic, ic->recalc_bitmap, ic->journal);
3215                                 block_bitmap_copy(ic, ic->may_write_bitmap, ic->journal);
3216                                 if (!block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors,
3217                                                      BITMAP_OP_TEST_ALL_CLEAR)) {
3218                                         ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3219                                         ic->sb->recalc_sector = cpu_to_le64(0);
3220                                 }
3221                         } else {
3222                                 DEBUG_print("non-matching blocks_per_bitmap_bit: %u, %u\n",
3223                                             ic->sb->log2_blocks_per_bitmap_bit, ic->log2_blocks_per_bitmap_bit);
3224                                 ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
3225                                 block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3226                                 block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3227                                 block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3228                                 rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0,
3229                                                    ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3230                                 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3231                                 ic->sb->recalc_sector = cpu_to_le64(0);
3232                         }
3233                 } else {
3234                         if (!(ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
3235                               block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR)) ||
3236                             ic->reset_recalculate_flag) {
3237                                 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3238                                 ic->sb->recalc_sector = cpu_to_le64(0);
3239                         }
3240                         init_journal(ic, 0, ic->journal_sections, 0);
3241                         replay_journal(ic);
3242                         ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3243                 }
3244                 r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA);
3245                 if (unlikely(r))
3246                         dm_integrity_io_error(ic, "writing superblock", r);
3247         } else {
3248                 replay_journal(ic);
3249                 if (ic->reset_recalculate_flag) {
3250                         ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3251                         ic->sb->recalc_sector = cpu_to_le64(0);
3252                 }
3253                 if (ic->mode == 'B') {
3254                         ic->sb->flags |= cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3255                         ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
3256                         r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA);
3257                         if (unlikely(r))
3258                                 dm_integrity_io_error(ic, "writing superblock", r);
3259
3260                         block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3261                         block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3262                         block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3263                         if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
3264                             le64_to_cpu(ic->sb->recalc_sector) < ic->provided_data_sectors) {
3265                                 block_bitmap_op(ic, ic->journal, le64_to_cpu(ic->sb->recalc_sector),
3266                                                 ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3267                                 block_bitmap_op(ic, ic->recalc_bitmap, le64_to_cpu(ic->sb->recalc_sector),
3268                                                 ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3269                                 block_bitmap_op(ic, ic->may_write_bitmap, le64_to_cpu(ic->sb->recalc_sector),
3270                                                 ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3271                         }
3272                         rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0,
3273                                            ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3274                 }
3275         }
3276
3277         DEBUG_print("testing recalc: %x\n", ic->sb->flags);
3278         if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
3279                 __u64 recalc_pos = le64_to_cpu(ic->sb->recalc_sector);
3280
3281                 DEBUG_print("recalc pos: %llx / %llx\n", recalc_pos, ic->provided_data_sectors);
3282                 if (recalc_pos < ic->provided_data_sectors) {
3283                         queue_work(ic->recalc_wq, &ic->recalc_work);
3284                 } else if (recalc_pos > ic->provided_data_sectors) {
3285                         ic->sb->recalc_sector = cpu_to_le64(ic->provided_data_sectors);
3286                         recalc_write_super(ic);
3287                 }
3288         }
3289
3290         ic->reboot_notifier.notifier_call = dm_integrity_reboot;
3291         ic->reboot_notifier.next = NULL;
3292         ic->reboot_notifier.priority = INT_MAX - 1;     /* be notified after md and before hardware drivers */
3293         WARN_ON(register_reboot_notifier(&ic->reboot_notifier));
3294
3295 #if 0
3296         /* set to 1 to stress test synchronous mode */
3297         dm_integrity_enter_synchronous_mode(ic);
3298 #endif
3299 }
3300
3301 static void dm_integrity_status(struct dm_target *ti, status_type_t type,
3302                                 unsigned int status_flags, char *result, unsigned int maxlen)
3303 {
3304         struct dm_integrity_c *ic = ti->private;
3305         unsigned int arg_count;
3306         size_t sz = 0;
3307
3308         switch (type) {
3309         case STATUSTYPE_INFO:
3310                 DMEMIT("%llu %llu",
3311                         (unsigned long long)atomic64_read(&ic->number_of_mismatches),
3312                         ic->provided_data_sectors);
3313                 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
3314                         DMEMIT(" %llu", le64_to_cpu(ic->sb->recalc_sector));
3315                 else
3316                         DMEMIT(" -");
3317                 break;
3318
3319         case STATUSTYPE_TABLE: {
3320                 __u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100;
3321
3322                 watermark_percentage += ic->journal_entries / 2;
3323                 do_div(watermark_percentage, ic->journal_entries);
3324                 arg_count = 3;
3325                 arg_count += !!ic->meta_dev;
3326                 arg_count += ic->sectors_per_block != 1;
3327                 arg_count += !!(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING));
3328                 arg_count += ic->reset_recalculate_flag;
3329                 arg_count += ic->discard;
3330                 arg_count += ic->mode == 'J';
3331                 arg_count += ic->mode == 'J';
3332                 arg_count += ic->mode == 'B';
3333                 arg_count += ic->mode == 'B';
3334                 arg_count += !!ic->internal_hash_alg.alg_string;
3335                 arg_count += !!ic->journal_crypt_alg.alg_string;
3336                 arg_count += !!ic->journal_mac_alg.alg_string;
3337                 arg_count += (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0;
3338                 arg_count += (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0;
3339                 arg_count += ic->legacy_recalculate;
3340                 DMEMIT("%s %llu %u %c %u", ic->dev->name, ic->start,
3341                        ic->tag_size, ic->mode, arg_count);
3342                 if (ic->meta_dev)
3343                         DMEMIT(" meta_device:%s", ic->meta_dev->name);
3344                 if (ic->sectors_per_block != 1)
3345                         DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
3346                 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
3347                         DMEMIT(" recalculate");
3348                 if (ic->reset_recalculate_flag)
3349                         DMEMIT(" reset_recalculate");
3350                 if (ic->discard)
3351                         DMEMIT(" allow_discards");
3352                 DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
3353                 DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors);
3354                 DMEMIT(" buffer_sectors:%u", 1U << ic->log2_buffer_sectors);
3355                 if (ic->mode == 'J') {
3356                         DMEMIT(" journal_watermark:%u", (unsigned int)watermark_percentage);
3357                         DMEMIT(" commit_time:%u", ic->autocommit_msec);
3358                 }
3359                 if (ic->mode == 'B') {
3360                         DMEMIT(" sectors_per_bit:%llu", (sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit);
3361                         DMEMIT(" bitmap_flush_interval:%u", jiffies_to_msecs(ic->bitmap_flush_interval));
3362                 }
3363                 if ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0)
3364                         DMEMIT(" fix_padding");
3365                 if ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0)
3366                         DMEMIT(" fix_hmac");
3367                 if (ic->legacy_recalculate)
3368                         DMEMIT(" legacy_recalculate");
3369
3370 #define EMIT_ALG(a, n)                                                  \
3371                 do {                                                    \
3372                         if (ic->a.alg_string) {                         \
3373                                 DMEMIT(" %s:%s", n, ic->a.alg_string);  \
3374                                 if (ic->a.key_string)                   \
3375                                         DMEMIT(":%s", ic->a.key_string);\
3376                         }                                               \
3377                 } while (0)
3378                 EMIT_ALG(internal_hash_alg, "internal_hash");
3379                 EMIT_ALG(journal_crypt_alg, "journal_crypt");
3380                 EMIT_ALG(journal_mac_alg, "journal_mac");
3381                 break;
3382         }
3383         case STATUSTYPE_IMA:
3384                 DMEMIT_TARGET_NAME_VERSION(ti->type);
3385                 DMEMIT(",dev_name=%s,start=%llu,tag_size=%u,mode=%c",
3386                         ic->dev->name, ic->start, ic->tag_size, ic->mode);
3387
3388                 if (ic->meta_dev)
3389                         DMEMIT(",meta_device=%s", ic->meta_dev->name);
3390                 if (ic->sectors_per_block != 1)
3391                         DMEMIT(",block_size=%u", ic->sectors_per_block << SECTOR_SHIFT);
3392
3393                 DMEMIT(",recalculate=%c", (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) ?
3394                        'y' : 'n');
3395                 DMEMIT(",allow_discards=%c", ic->discard ? 'y' : 'n');
3396                 DMEMIT(",fix_padding=%c",
3397                        ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0) ? 'y' : 'n');
3398                 DMEMIT(",fix_hmac=%c",
3399                        ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0) ? 'y' : 'n');
3400                 DMEMIT(",legacy_recalculate=%c", ic->legacy_recalculate ? 'y' : 'n');
3401
3402                 DMEMIT(",journal_sectors=%u", ic->initial_sectors - SB_SECTORS);
3403                 DMEMIT(",interleave_sectors=%u", 1U << ic->sb->log2_interleave_sectors);
3404                 DMEMIT(",buffer_sectors=%u", 1U << ic->log2_buffer_sectors);
3405                 DMEMIT(";");
3406                 break;
3407         }
3408 }
3409
3410 static int dm_integrity_iterate_devices(struct dm_target *ti,
3411                                         iterate_devices_callout_fn fn, void *data)
3412 {
3413         struct dm_integrity_c *ic = ti->private;
3414
3415         if (!ic->meta_dev)
3416                 return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data);
3417         else
3418                 return fn(ti, ic->dev, 0, ti->len, data);
3419 }
3420
3421 static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits)
3422 {
3423         struct dm_integrity_c *ic = ti->private;
3424
3425         if (ic->sectors_per_block > 1) {
3426                 limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
3427                 limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
3428                 blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT);
3429                 limits->dma_alignment = limits->logical_block_size - 1;
3430         }
3431 }
3432
3433 static void calculate_journal_section_size(struct dm_integrity_c *ic)
3434 {
3435         unsigned int sector_space = JOURNAL_SECTOR_DATA;
3436
3437         ic->journal_sections = le32_to_cpu(ic->sb->journal_sections);
3438         ic->journal_entry_size = roundup(offsetof(struct journal_entry, last_bytes[ic->sectors_per_block]) + ic->tag_size,
3439                                          JOURNAL_ENTRY_ROUNDUP);
3440
3441         if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC))
3442                 sector_space -= JOURNAL_MAC_PER_SECTOR;
3443         ic->journal_entries_per_sector = sector_space / ic->journal_entry_size;
3444         ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS;
3445         ic->journal_section_sectors = (ic->journal_section_entries << ic->sb->log2_sectors_per_block) + JOURNAL_BLOCK_SECTORS;
3446         ic->journal_entries = ic->journal_section_entries * ic->journal_sections;
3447 }
3448
3449 static int calculate_device_limits(struct dm_integrity_c *ic)
3450 {
3451         __u64 initial_sectors;
3452
3453         calculate_journal_section_size(ic);
3454         initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections;
3455         if (initial_sectors + METADATA_PADDING_SECTORS >= ic->meta_device_sectors || initial_sectors > UINT_MAX)
3456                 return -EINVAL;
3457         ic->initial_sectors = initial_sectors;
3458
3459         if (!ic->meta_dev) {
3460                 sector_t last_sector, last_area, last_offset;
3461
3462                 /* we have to maintain excessive padding for compatibility with existing volumes */
3463                 __u64 metadata_run_padding =
3464                         ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING) ?
3465                         (__u64)(METADATA_PADDING_SECTORS << SECTOR_SHIFT) :
3466                         (__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS);
3467
3468                 ic->metadata_run = round_up((__u64)ic->tag_size << (ic->sb->log2_interleave_sectors - ic->sb->log2_sectors_per_block),
3469                                             metadata_run_padding) >> SECTOR_SHIFT;
3470                 if (!(ic->metadata_run & (ic->metadata_run - 1)))
3471                         ic->log2_metadata_run = __ffs(ic->metadata_run);
3472                 else
3473                         ic->log2_metadata_run = -1;
3474
3475                 get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset);
3476                 last_sector = get_data_sector(ic, last_area, last_offset);
3477                 if (last_sector < ic->start || last_sector >= ic->meta_device_sectors)
3478                         return -EINVAL;
3479         } else {
3480                 __u64 meta_size = (ic->provided_data_sectors >> ic->sb->log2_sectors_per_block) * ic->tag_size;
3481
3482                 meta_size = (meta_size + ((1U << (ic->log2_buffer_sectors + SECTOR_SHIFT)) - 1))
3483                                 >> (ic->log2_buffer_sectors + SECTOR_SHIFT);
3484                 meta_size <<= ic->log2_buffer_sectors;
3485                 if (ic->initial_sectors + meta_size < ic->initial_sectors ||
3486                     ic->initial_sectors + meta_size > ic->meta_device_sectors)
3487                         return -EINVAL;
3488                 ic->metadata_run = 1;
3489                 ic->log2_metadata_run = 0;
3490         }
3491
3492         return 0;
3493 }
3494
3495 static void get_provided_data_sectors(struct dm_integrity_c *ic)
3496 {
3497         if (!ic->meta_dev) {
3498                 int test_bit;
3499
3500                 ic->provided_data_sectors = 0;
3501                 for (test_bit = fls64(ic->meta_device_sectors) - 1; test_bit >= 3; test_bit--) {
3502                         __u64 prev_data_sectors = ic->provided_data_sectors;
3503
3504                         ic->provided_data_sectors |= (sector_t)1 << test_bit;
3505                         if (calculate_device_limits(ic))
3506                                 ic->provided_data_sectors = prev_data_sectors;
3507                 }
3508         } else {
3509                 ic->provided_data_sectors = ic->data_device_sectors;
3510                 ic->provided_data_sectors &= ~(sector_t)(ic->sectors_per_block - 1);
3511         }
3512 }
3513
3514 static int initialize_superblock(struct dm_integrity_c *ic,
3515                                  unsigned int journal_sectors, unsigned int interleave_sectors)
3516 {
3517         unsigned int journal_sections;
3518         int test_bit;
3519
3520         memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT);
3521         memcpy(ic->sb->magic, SB_MAGIC, 8);
3522         ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size);
3523         ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block);
3524         if (ic->journal_mac_alg.alg_string)
3525                 ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC);
3526
3527         calculate_journal_section_size(ic);
3528         journal_sections = journal_sectors / ic->journal_section_sectors;
3529         if (!journal_sections)
3530                 journal_sections = 1;
3531
3532         if (ic->fix_hmac && (ic->internal_hash_alg.alg_string || ic->journal_mac_alg.alg_string)) {
3533                 ic->sb->flags |= cpu_to_le32(SB_FLAG_FIXED_HMAC);
3534                 get_random_bytes(ic->sb->salt, SALT_SIZE);
3535         }
3536
3537         if (!ic->meta_dev) {
3538                 if (ic->fix_padding)
3539                         ic->sb->flags |= cpu_to_le32(SB_FLAG_FIXED_PADDING);
3540                 ic->sb->journal_sections = cpu_to_le32(journal_sections);
3541                 if (!interleave_sectors)
3542                         interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
3543                 ic->sb->log2_interleave_sectors = __fls(interleave_sectors);
3544                 ic->sb->log2_interleave_sectors = max_t(__u8, MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3545                 ic->sb->log2_interleave_sectors = min_t(__u8, MAX_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3546
3547                 get_provided_data_sectors(ic);
3548                 if (!ic->provided_data_sectors)
3549                         return -EINVAL;
3550         } else {
3551                 ic->sb->log2_interleave_sectors = 0;
3552
3553                 get_provided_data_sectors(ic);
3554                 if (!ic->provided_data_sectors)
3555                         return -EINVAL;
3556
3557 try_smaller_buffer:
3558                 ic->sb->journal_sections = cpu_to_le32(0);
3559                 for (test_bit = fls(journal_sections) - 1; test_bit >= 0; test_bit--) {
3560                         __u32 prev_journal_sections = le32_to_cpu(ic->sb->journal_sections);
3561                         __u32 test_journal_sections = prev_journal_sections | (1U << test_bit);
3562
3563                         if (test_journal_sections > journal_sections)
3564                                 continue;
3565                         ic->sb->journal_sections = cpu_to_le32(test_journal_sections);
3566                         if (calculate_device_limits(ic))
3567                                 ic->sb->journal_sections = cpu_to_le32(prev_journal_sections);
3568
3569                 }
3570                 if (!le32_to_cpu(ic->sb->journal_sections)) {
3571                         if (ic->log2_buffer_sectors > 3) {
3572                                 ic->log2_buffer_sectors--;
3573                                 goto try_smaller_buffer;
3574                         }
3575                         return -EINVAL;
3576                 }
3577         }
3578
3579         ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
3580
3581         sb_set_version(ic);
3582
3583         return 0;
3584 }
3585
3586 static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic)
3587 {
3588         struct gendisk *disk = dm_disk(dm_table_get_md(ti->table));
3589         struct blk_integrity bi;
3590
3591         memset(&bi, 0, sizeof(bi));
3592         bi.profile = &dm_integrity_profile;
3593         bi.tuple_size = ic->tag_size;
3594         bi.tag_size = bi.tuple_size;
3595         bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT;
3596
3597         blk_integrity_register(disk, &bi);
3598         blk_queue_max_integrity_segments(disk->queue, UINT_MAX);
3599 }
3600
3601 static void dm_integrity_free_page_list(struct page_list *pl)
3602 {
3603         unsigned int i;
3604
3605         if (!pl)
3606                 return;
3607         for (i = 0; pl[i].page; i++)
3608                 __free_page(pl[i].page);
3609         kvfree(pl);
3610 }
3611
3612 static struct page_list *dm_integrity_alloc_page_list(unsigned int n_pages)
3613 {
3614         struct page_list *pl;
3615         unsigned int i;
3616
3617         pl = kvmalloc_array(n_pages + 1, sizeof(struct page_list), GFP_KERNEL | __GFP_ZERO);
3618         if (!pl)
3619                 return NULL;
3620
3621         for (i = 0; i < n_pages; i++) {
3622                 pl[i].page = alloc_page(GFP_KERNEL);
3623                 if (!pl[i].page) {
3624                         dm_integrity_free_page_list(pl);
3625                         return NULL;
3626                 }
3627                 if (i)
3628                         pl[i - 1].next = &pl[i];
3629         }
3630         pl[i].page = NULL;
3631         pl[i].next = NULL;
3632
3633         return pl;
3634 }
3635
3636 static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl)
3637 {
3638         unsigned int i;
3639
3640         for (i = 0; i < ic->journal_sections; i++)
3641                 kvfree(sl[i]);
3642         kvfree(sl);
3643 }
3644
3645 static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic,
3646                                                                    struct page_list *pl)
3647 {
3648         struct scatterlist **sl;
3649         unsigned int i;
3650
3651         sl = kvmalloc_array(ic->journal_sections,
3652                             sizeof(struct scatterlist *),
3653                             GFP_KERNEL | __GFP_ZERO);
3654         if (!sl)
3655                 return NULL;
3656
3657         for (i = 0; i < ic->journal_sections; i++) {
3658                 struct scatterlist *s;
3659                 unsigned int start_index, start_offset;
3660                 unsigned int end_index, end_offset;
3661                 unsigned int n_pages;
3662                 unsigned int idx;
3663
3664                 page_list_location(ic, i, 0, &start_index, &start_offset);
3665                 page_list_location(ic, i, ic->journal_section_sectors - 1,
3666                                    &end_index, &end_offset);
3667
3668                 n_pages = (end_index - start_index + 1);
3669
3670                 s = kvmalloc_array(n_pages, sizeof(struct scatterlist),
3671                                    GFP_KERNEL);
3672                 if (!s) {
3673                         dm_integrity_free_journal_scatterlist(ic, sl);
3674                         return NULL;
3675                 }
3676
3677                 sg_init_table(s, n_pages);
3678                 for (idx = start_index; idx <= end_index; idx++) {
3679                         char *va = lowmem_page_address(pl[idx].page);
3680                         unsigned int start = 0, end = PAGE_SIZE;
3681
3682                         if (idx == start_index)
3683                                 start = start_offset;
3684                         if (idx == end_index)
3685                                 end = end_offset + (1 << SECTOR_SHIFT);
3686                         sg_set_buf(&s[idx - start_index], va + start, end - start);
3687                 }
3688
3689                 sl[i] = s;
3690         }
3691
3692         return sl;
3693 }
3694
3695 static void free_alg(struct alg_spec *a)
3696 {
3697         kfree_sensitive(a->alg_string);
3698         kfree_sensitive(a->key);
3699         memset(a, 0, sizeof(*a));
3700 }
3701
3702 static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval)
3703 {
3704         char *k;
3705
3706         free_alg(a);
3707
3708         a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL);
3709         if (!a->alg_string)
3710                 goto nomem;
3711
3712         k = strchr(a->alg_string, ':');
3713         if (k) {
3714                 *k = 0;
3715                 a->key_string = k + 1;
3716                 if (strlen(a->key_string) & 1)
3717                         goto inval;
3718
3719                 a->key_size = strlen(a->key_string) / 2;
3720                 a->key = kmalloc(a->key_size, GFP_KERNEL);
3721                 if (!a->key)
3722                         goto nomem;
3723                 if (hex2bin(a->key, a->key_string, a->key_size))
3724                         goto inval;
3725         }
3726
3727         return 0;
3728 inval:
3729         *error = error_inval;
3730         return -EINVAL;
3731 nomem:
3732         *error = "Out of memory for an argument";
3733         return -ENOMEM;
3734 }
3735
3736 static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error,
3737                    char *error_alg, char *error_key)
3738 {
3739         int r;
3740
3741         if (a->alg_string) {
3742                 *hash = crypto_alloc_shash(a->alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
3743                 if (IS_ERR(*hash)) {
3744                         *error = error_alg;
3745                         r = PTR_ERR(*hash);
3746                         *hash = NULL;
3747                         return r;
3748                 }
3749
3750                 if (a->key) {
3751                         r = crypto_shash_setkey(*hash, a->key, a->key_size);
3752                         if (r) {
3753                                 *error = error_key;
3754                                 return r;
3755                         }
3756                 } else if (crypto_shash_get_flags(*hash) & CRYPTO_TFM_NEED_KEY) {
3757                         *error = error_key;
3758                         return -ENOKEY;
3759                 }
3760         }
3761
3762         return 0;
3763 }
3764
3765 static int create_journal(struct dm_integrity_c *ic, char **error)
3766 {
3767         int r = 0;
3768         unsigned int i;
3769         __u64 journal_pages, journal_desc_size, journal_tree_size;
3770         unsigned char *crypt_data = NULL, *crypt_iv = NULL;
3771         struct skcipher_request *req = NULL;
3772
3773         ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL);
3774         ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL);
3775         ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL);
3776         ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL);
3777
3778         journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
3779                                 PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
3780         journal_desc_size = journal_pages * sizeof(struct page_list);
3781         if (journal_pages >= totalram_pages() - totalhigh_pages() || journal_desc_size > ULONG_MAX) {
3782                 *error = "Journal doesn't fit into memory";
3783                 r = -ENOMEM;
3784                 goto bad;
3785         }
3786         ic->journal_pages = journal_pages;
3787
3788         ic->journal = dm_integrity_alloc_page_list(ic->journal_pages);
3789         if (!ic->journal) {
3790                 *error = "Could not allocate memory for journal";
3791                 r = -ENOMEM;
3792                 goto bad;
3793         }
3794         if (ic->journal_crypt_alg.alg_string) {
3795                 unsigned int ivsize, blocksize;
3796                 struct journal_completion comp;
3797
3798                 comp.ic = ic;
3799                 ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
3800                 if (IS_ERR(ic->journal_crypt)) {
3801                         *error = "Invalid journal cipher";
3802                         r = PTR_ERR(ic->journal_crypt);
3803                         ic->journal_crypt = NULL;
3804                         goto bad;
3805                 }
3806                 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
3807                 blocksize = crypto_skcipher_blocksize(ic->journal_crypt);
3808
3809                 if (ic->journal_crypt_alg.key) {
3810                         r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key,
3811                                                    ic->journal_crypt_alg.key_size);
3812                         if (r) {
3813                                 *error = "Error setting encryption key";
3814                                 goto bad;
3815                         }
3816                 }
3817                 DEBUG_print("cipher %s, block size %u iv size %u\n",
3818                             ic->journal_crypt_alg.alg_string, blocksize, ivsize);
3819
3820                 ic->journal_io = dm_integrity_alloc_page_list(ic->journal_pages);
3821                 if (!ic->journal_io) {
3822                         *error = "Could not allocate memory for journal io";
3823                         r = -ENOMEM;
3824                         goto bad;
3825                 }
3826
3827                 if (blocksize == 1) {
3828                         struct scatterlist *sg;
3829
3830                         req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3831                         if (!req) {
3832                                 *error = "Could not allocate crypt request";
3833                                 r = -ENOMEM;
3834                                 goto bad;
3835                         }
3836
3837                         crypt_iv = kzalloc(ivsize, GFP_KERNEL);
3838                         if (!crypt_iv) {
3839                                 *error = "Could not allocate iv";
3840                                 r = -ENOMEM;
3841                                 goto bad;
3842                         }
3843
3844                         ic->journal_xor = dm_integrity_alloc_page_list(ic->journal_pages);
3845                         if (!ic->journal_xor) {
3846                                 *error = "Could not allocate memory for journal xor";
3847                                 r = -ENOMEM;
3848                                 goto bad;
3849                         }
3850
3851                         sg = kvmalloc_array(ic->journal_pages + 1,
3852                                             sizeof(struct scatterlist),
3853                                             GFP_KERNEL);
3854                         if (!sg) {
3855                                 *error = "Unable to allocate sg list";
3856                                 r = -ENOMEM;
3857                                 goto bad;
3858                         }
3859                         sg_init_table(sg, ic->journal_pages + 1);
3860                         for (i = 0; i < ic->journal_pages; i++) {
3861                                 char *va = lowmem_page_address(ic->journal_xor[i].page);
3862
3863                                 clear_page(va);
3864                                 sg_set_buf(&sg[i], va, PAGE_SIZE);
3865                         }
3866                         sg_set_buf(&sg[i], &ic->commit_ids, sizeof(ic->commit_ids));
3867
3868                         skcipher_request_set_crypt(req, sg, sg,
3869                                                    PAGE_SIZE * ic->journal_pages + sizeof(ic->commit_ids), crypt_iv);
3870                         init_completion(&comp.comp);
3871                         comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3872                         if (do_crypt(true, req, &comp))
3873                                 wait_for_completion(&comp.comp);
3874                         kvfree(sg);
3875                         r = dm_integrity_failed(ic);
3876                         if (r) {
3877                                 *error = "Unable to encrypt journal";
3878                                 goto bad;
3879                         }
3880                         DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data");
3881
3882                         crypto_free_skcipher(ic->journal_crypt);
3883                         ic->journal_crypt = NULL;
3884                 } else {
3885                         unsigned int crypt_len = roundup(ivsize, blocksize);
3886
3887                         req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3888                         if (!req) {
3889                                 *error = "Could not allocate crypt request";
3890                                 r = -ENOMEM;
3891                                 goto bad;
3892                         }
3893
3894                         crypt_iv = kmalloc(ivsize, GFP_KERNEL);
3895                         if (!crypt_iv) {
3896                                 *error = "Could not allocate iv";
3897                                 r = -ENOMEM;
3898                                 goto bad;
3899                         }
3900
3901                         crypt_data = kmalloc(crypt_len, GFP_KERNEL);
3902                         if (!crypt_data) {
3903                                 *error = "Unable to allocate crypt data";
3904                                 r = -ENOMEM;
3905                                 goto bad;
3906                         }
3907
3908                         ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal);
3909                         if (!ic->journal_scatterlist) {
3910                                 *error = "Unable to allocate sg list";
3911                                 r = -ENOMEM;
3912                                 goto bad;
3913                         }
3914                         ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io);
3915                         if (!ic->journal_io_scatterlist) {
3916                                 *error = "Unable to allocate sg list";
3917                                 r = -ENOMEM;
3918                                 goto bad;
3919                         }
3920                         ic->sk_requests = kvmalloc_array(ic->journal_sections,
3921                                                          sizeof(struct skcipher_request *),
3922                                                          GFP_KERNEL | __GFP_ZERO);
3923                         if (!ic->sk_requests) {
3924                                 *error = "Unable to allocate sk requests";
3925                                 r = -ENOMEM;
3926                                 goto bad;
3927                         }
3928                         for (i = 0; i < ic->journal_sections; i++) {
3929                                 struct scatterlist sg;
3930                                 struct skcipher_request *section_req;
3931                                 __le32 section_le = cpu_to_le32(i);
3932
3933                                 memset(crypt_iv, 0x00, ivsize);
3934                                 memset(crypt_data, 0x00, crypt_len);
3935                                 memcpy(crypt_data, &section_le, min_t(size_t, crypt_len, sizeof(section_le)));
3936
3937                                 sg_init_one(&sg, crypt_data, crypt_len);
3938                                 skcipher_request_set_crypt(req, &sg, &sg, crypt_len, crypt_iv);
3939                                 init_completion(&comp.comp);
3940                                 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3941                                 if (do_crypt(true, req, &comp))
3942                                         wait_for_completion(&comp.comp);
3943
3944                                 r = dm_integrity_failed(ic);
3945                                 if (r) {
3946                                         *error = "Unable to generate iv";
3947                                         goto bad;
3948                                 }
3949
3950                                 section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3951                                 if (!section_req) {
3952                                         *error = "Unable to allocate crypt request";
3953                                         r = -ENOMEM;
3954                                         goto bad;
3955                                 }
3956                                 section_req->iv = kmalloc_array(ivsize, 2,
3957                                                                 GFP_KERNEL);
3958                                 if (!section_req->iv) {
3959                                         skcipher_request_free(section_req);
3960                                         *error = "Unable to allocate iv";
3961                                         r = -ENOMEM;
3962                                         goto bad;
3963                                 }
3964                                 memcpy(section_req->iv + ivsize, crypt_data, ivsize);
3965                                 section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT;
3966                                 ic->sk_requests[i] = section_req;
3967                                 DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i);
3968                         }
3969                 }
3970         }
3971
3972         for (i = 0; i < N_COMMIT_IDS; i++) {
3973                 unsigned int j;
3974
3975 retest_commit_id:
3976                 for (j = 0; j < i; j++) {
3977                         if (ic->commit_ids[j] == ic->commit_ids[i]) {
3978                                 ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1);
3979                                 goto retest_commit_id;
3980                         }
3981                 }
3982                 DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]);
3983         }
3984
3985         journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node);
3986         if (journal_tree_size > ULONG_MAX) {
3987                 *error = "Journal doesn't fit into memory";
3988                 r = -ENOMEM;
3989                 goto bad;
3990         }
3991         ic->journal_tree = kvmalloc(journal_tree_size, GFP_KERNEL);
3992         if (!ic->journal_tree) {
3993                 *error = "Could not allocate memory for journal tree";
3994                 r = -ENOMEM;
3995         }
3996 bad:
3997         kfree(crypt_data);
3998         kfree(crypt_iv);
3999         skcipher_request_free(req);
4000
4001         return r;
4002 }
4003
4004 /*
4005  * Construct a integrity mapping
4006  *
4007  * Arguments:
4008  *      device
4009  *      offset from the start of the device
4010  *      tag size
4011  *      D - direct writes, J - journal writes, B - bitmap mode, R - recovery mode
4012  *      number of optional arguments
4013  *      optional arguments:
4014  *              journal_sectors
4015  *              interleave_sectors
4016  *              buffer_sectors
4017  *              journal_watermark
4018  *              commit_time
4019  *              meta_device
4020  *              block_size
4021  *              sectors_per_bit
4022  *              bitmap_flush_interval
4023  *              internal_hash
4024  *              journal_crypt
4025  *              journal_mac
4026  *              recalculate
4027  */
4028 static int dm_integrity_ctr(struct dm_target *ti, unsigned int argc, char **argv)
4029 {
4030         struct dm_integrity_c *ic;
4031         char dummy;
4032         int r;
4033         unsigned int extra_args;
4034         struct dm_arg_set as;
4035         static const struct dm_arg _args[] = {
4036                 {0, 18, "Invalid number of feature args"},
4037         };
4038         unsigned int journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
4039         bool should_write_sb;
4040         __u64 threshold;
4041         unsigned long long start;
4042         __s8 log2_sectors_per_bitmap_bit = -1;
4043         __s8 log2_blocks_per_bitmap_bit;
4044         __u64 bits_in_journal;
4045         __u64 n_bitmap_bits;
4046
4047 #define DIRECT_ARGUMENTS        4
4048
4049         if (argc <= DIRECT_ARGUMENTS) {
4050                 ti->error = "Invalid argument count";
4051                 return -EINVAL;
4052         }
4053
4054         ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL);
4055         if (!ic) {
4056                 ti->error = "Cannot allocate integrity context";
4057                 return -ENOMEM;
4058         }
4059         ti->private = ic;
4060         ti->per_io_data_size = sizeof(struct dm_integrity_io);
4061         ic->ti = ti;
4062
4063         ic->in_progress = RB_ROOT;
4064         INIT_LIST_HEAD(&ic->wait_list);
4065         init_waitqueue_head(&ic->endio_wait);
4066         bio_list_init(&ic->flush_bio_list);
4067         init_waitqueue_head(&ic->copy_to_journal_wait);
4068         init_completion(&ic->crypto_backoff);
4069         atomic64_set(&ic->number_of_mismatches, 0);
4070         ic->bitmap_flush_interval = BITMAP_FLUSH_INTERVAL;
4071
4072         r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
4073         if (r) {
4074                 ti->error = "Device lookup failed";
4075                 goto bad;
4076         }
4077
4078         if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) {
4079                 ti->error = "Invalid starting offset";
4080                 r = -EINVAL;
4081                 goto bad;
4082         }
4083         ic->start = start;
4084
4085         if (strcmp(argv[2], "-")) {
4086                 if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) {
4087                         ti->error = "Invalid tag size";
4088                         r = -EINVAL;
4089                         goto bad;
4090                 }
4091         }
4092
4093         if (!strcmp(argv[3], "J") || !strcmp(argv[3], "B") ||
4094             !strcmp(argv[3], "D") || !strcmp(argv[3], "R")) {
4095                 ic->mode = argv[3][0];
4096         } else {
4097                 ti->error = "Invalid mode (expecting J, B, D, R)";
4098                 r = -EINVAL;
4099                 goto bad;
4100         }
4101
4102         journal_sectors = 0;
4103         interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
4104         buffer_sectors = DEFAULT_BUFFER_SECTORS;
4105         journal_watermark = DEFAULT_JOURNAL_WATERMARK;
4106         sync_msec = DEFAULT_SYNC_MSEC;
4107         ic->sectors_per_block = 1;
4108
4109         as.argc = argc - DIRECT_ARGUMENTS;
4110         as.argv = argv + DIRECT_ARGUMENTS;
4111         r = dm_read_arg_group(_args, &as, &extra_args, &ti->error);
4112         if (r)
4113                 goto bad;
4114
4115         while (extra_args--) {
4116                 const char *opt_string;
4117                 unsigned int val;
4118                 unsigned long long llval;
4119
4120                 opt_string = dm_shift_arg(&as);
4121                 if (!opt_string) {
4122                         r = -EINVAL;
4123                         ti->error = "Not enough feature arguments";
4124                         goto bad;
4125                 }
4126                 if (sscanf(opt_string, "journal_sectors:%u%c", &val, &dummy) == 1)
4127                         journal_sectors = val ? val : 1;
4128                 else if (sscanf(opt_string, "interleave_sectors:%u%c", &val, &dummy) == 1)
4129                         interleave_sectors = val;
4130                 else if (sscanf(opt_string, "buffer_sectors:%u%c", &val, &dummy) == 1)
4131                         buffer_sectors = val;
4132                 else if (sscanf(opt_string, "journal_watermark:%u%c", &val, &dummy) == 1 && val <= 100)
4133                         journal_watermark = val;
4134                 else if (sscanf(opt_string, "commit_time:%u%c", &val, &dummy) == 1)
4135                         sync_msec = val;
4136                 else if (!strncmp(opt_string, "meta_device:", strlen("meta_device:"))) {
4137                         if (ic->meta_dev) {
4138                                 dm_put_device(ti, ic->meta_dev);
4139                                 ic->meta_dev = NULL;
4140                         }
4141                         r = dm_get_device(ti, strchr(opt_string, ':') + 1,
4142                                           dm_table_get_mode(ti->table), &ic->meta_dev);
4143                         if (r) {
4144                                 ti->error = "Device lookup failed";
4145                                 goto bad;
4146                         }
4147                 } else if (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) {
4148                         if (val < 1 << SECTOR_SHIFT ||
4149                             val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT ||
4150                             (val & (val - 1))) {
4151                                 r = -EINVAL;
4152                                 ti->error = "Invalid block_size argument";
4153                                 goto bad;
4154                         }
4155                         ic->sectors_per_block = val >> SECTOR_SHIFT;
4156                 } else if (sscanf(opt_string, "sectors_per_bit:%llu%c", &llval, &dummy) == 1) {
4157                         log2_sectors_per_bitmap_bit = !llval ? 0 : __ilog2_u64(llval);
4158                 } else if (sscanf(opt_string, "bitmap_flush_interval:%u%c", &val, &dummy) == 1) {
4159                         if (val >= (uint64_t)UINT_MAX * 1000 / HZ) {
4160                                 r = -EINVAL;
4161                                 ti->error = "Invalid bitmap_flush_interval argument";
4162                                 goto bad;
4163                         }
4164                         ic->bitmap_flush_interval = msecs_to_jiffies(val);
4165                 } else if (!strncmp(opt_string, "internal_hash:", strlen("internal_hash:"))) {
4166                         r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error,
4167                                             "Invalid internal_hash argument");
4168                         if (r)
4169                                 goto bad;
4170                 } else if (!strncmp(opt_string, "journal_crypt:", strlen("journal_crypt:"))) {
4171                         r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error,
4172                                             "Invalid journal_crypt argument");
4173                         if (r)
4174                                 goto bad;
4175                 } else if (!strncmp(opt_string, "journal_mac:", strlen("journal_mac:"))) {
4176                         r = get_alg_and_key(opt_string, &ic->journal_mac_alg, &ti->error,
4177                                             "Invalid journal_mac argument");
4178                         if (r)
4179                                 goto bad;
4180                 } else if (!strcmp(opt_string, "recalculate")) {
4181                         ic->recalculate_flag = true;
4182                 } else if (!strcmp(opt_string, "reset_recalculate")) {
4183                         ic->recalculate_flag = true;
4184                         ic->reset_recalculate_flag = true;
4185                 } else if (!strcmp(opt_string, "allow_discards")) {
4186                         ic->discard = true;
4187                 } else if (!strcmp(opt_string, "fix_padding")) {
4188                         ic->fix_padding = true;
4189                 } else if (!strcmp(opt_string, "fix_hmac")) {
4190                         ic->fix_hmac = true;
4191                 } else if (!strcmp(opt_string, "legacy_recalculate")) {
4192                         ic->legacy_recalculate = true;
4193                 } else {
4194                         r = -EINVAL;
4195                         ti->error = "Invalid argument";
4196                         goto bad;
4197                 }
4198         }
4199
4200         ic->data_device_sectors = bdev_nr_sectors(ic->dev->bdev);
4201         if (!ic->meta_dev)
4202                 ic->meta_device_sectors = ic->data_device_sectors;
4203         else
4204                 ic->meta_device_sectors = bdev_nr_sectors(ic->meta_dev->bdev);
4205
4206         if (!journal_sectors) {
4207                 journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS,
4208                                       ic->data_device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR);
4209         }
4210
4211         if (!buffer_sectors)
4212                 buffer_sectors = 1;
4213         ic->log2_buffer_sectors = min((int)__fls(buffer_sectors), 31 - SECTOR_SHIFT);
4214
4215         r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error,
4216                     "Invalid internal hash", "Error setting internal hash key");
4217         if (r)
4218                 goto bad;
4219
4220         r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error,
4221                     "Invalid journal mac", "Error setting journal mac key");
4222         if (r)
4223                 goto bad;
4224
4225         if (!ic->tag_size) {
4226                 if (!ic->internal_hash) {
4227                         ti->error = "Unknown tag size";
4228                         r = -EINVAL;
4229                         goto bad;
4230                 }
4231                 ic->tag_size = crypto_shash_digestsize(ic->internal_hash);
4232         }
4233         if (ic->tag_size > MAX_TAG_SIZE) {
4234                 ti->error = "Too big tag size";
4235                 r = -EINVAL;
4236                 goto bad;
4237         }
4238         if (!(ic->tag_size & (ic->tag_size - 1)))
4239                 ic->log2_tag_size = __ffs(ic->tag_size);
4240         else
4241                 ic->log2_tag_size = -1;
4242
4243         if (ic->mode == 'B' && !ic->internal_hash) {
4244                 r = -EINVAL;
4245                 ti->error = "Bitmap mode can be only used with internal hash";
4246                 goto bad;
4247         }
4248
4249         if (ic->discard && !ic->internal_hash) {
4250                 r = -EINVAL;
4251                 ti->error = "Discard can be only used with internal hash";
4252                 goto bad;
4253         }
4254
4255         ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
4256         ic->autocommit_msec = sync_msec;
4257         timer_setup(&ic->autocommit_timer, autocommit_fn, 0);
4258
4259         ic->io = dm_io_client_create();
4260         if (IS_ERR(ic->io)) {
4261                 r = PTR_ERR(ic->io);
4262                 ic->io = NULL;
4263                 ti->error = "Cannot allocate dm io";
4264                 goto bad;
4265         }
4266
4267         r = mempool_init_slab_pool(&ic->journal_io_mempool, JOURNAL_IO_MEMPOOL, journal_io_cache);
4268         if (r) {
4269                 ti->error = "Cannot allocate mempool";
4270                 goto bad;
4271         }
4272
4273         ic->metadata_wq = alloc_workqueue("dm-integrity-metadata",
4274                                           WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE);
4275         if (!ic->metadata_wq) {
4276                 ti->error = "Cannot allocate workqueue";
4277                 r = -ENOMEM;
4278                 goto bad;
4279         }
4280
4281         /*
4282          * If this workqueue weren't ordered, it would cause bio reordering
4283          * and reduced performance.
4284          */
4285         ic->wait_wq = alloc_ordered_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM);
4286         if (!ic->wait_wq) {
4287                 ti->error = "Cannot allocate workqueue";
4288                 r = -ENOMEM;
4289                 goto bad;
4290         }
4291
4292         ic->offload_wq = alloc_workqueue("dm-integrity-offload", WQ_MEM_RECLAIM,
4293                                           METADATA_WORKQUEUE_MAX_ACTIVE);
4294         if (!ic->offload_wq) {
4295                 ti->error = "Cannot allocate workqueue";
4296                 r = -ENOMEM;
4297                 goto bad;
4298         }
4299
4300         ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1);
4301         if (!ic->commit_wq) {
4302                 ti->error = "Cannot allocate workqueue";
4303                 r = -ENOMEM;
4304                 goto bad;
4305         }
4306         INIT_WORK(&ic->commit_work, integrity_commit);
4307
4308         if (ic->mode == 'J' || ic->mode == 'B') {
4309                 ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1);
4310                 if (!ic->writer_wq) {
4311                         ti->error = "Cannot allocate workqueue";
4312                         r = -ENOMEM;
4313                         goto bad;
4314                 }
4315                 INIT_WORK(&ic->writer_work, integrity_writer);
4316         }
4317
4318         ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL);
4319         if (!ic->sb) {
4320                 r = -ENOMEM;
4321                 ti->error = "Cannot allocate superblock area";
4322                 goto bad;
4323         }
4324
4325         r = sync_rw_sb(ic, REQ_OP_READ);
4326         if (r) {
4327                 ti->error = "Error reading superblock";
4328                 goto bad;
4329         }
4330         should_write_sb = false;
4331         if (memcmp(ic->sb->magic, SB_MAGIC, 8)) {
4332                 if (ic->mode != 'R') {
4333                         if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) {
4334                                 r = -EINVAL;
4335                                 ti->error = "The device is not initialized";
4336                                 goto bad;
4337                         }
4338                 }
4339
4340                 r = initialize_superblock(ic, journal_sectors, interleave_sectors);
4341                 if (r) {
4342                         ti->error = "Could not initialize superblock";
4343                         goto bad;
4344                 }
4345                 if (ic->mode != 'R')
4346                         should_write_sb = true;
4347         }
4348
4349         if (!ic->sb->version || ic->sb->version > SB_VERSION_5) {
4350                 r = -EINVAL;
4351                 ti->error = "Unknown version";
4352                 goto bad;
4353         }
4354         if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) {
4355                 r = -EINVAL;
4356                 ti->error = "Tag size doesn't match the information in superblock";
4357                 goto bad;
4358         }
4359         if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) {
4360                 r = -EINVAL;
4361                 ti->error = "Block size doesn't match the information in superblock";
4362                 goto bad;
4363         }
4364         if (!le32_to_cpu(ic->sb->journal_sections)) {
4365                 r = -EINVAL;
4366                 ti->error = "Corrupted superblock, journal_sections is 0";
4367                 goto bad;
4368         }
4369         /* make sure that ti->max_io_len doesn't overflow */
4370         if (!ic->meta_dev) {
4371                 if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS ||
4372                     ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) {
4373                         r = -EINVAL;
4374                         ti->error = "Invalid interleave_sectors in the superblock";
4375                         goto bad;
4376                 }
4377         } else {
4378                 if (ic->sb->log2_interleave_sectors) {
4379                         r = -EINVAL;
4380                         ti->error = "Invalid interleave_sectors in the superblock";
4381                         goto bad;
4382                 }
4383         }
4384         if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
4385                 r = -EINVAL;
4386                 ti->error = "Journal mac mismatch";
4387                 goto bad;
4388         }
4389
4390         get_provided_data_sectors(ic);
4391         if (!ic->provided_data_sectors) {
4392                 r = -EINVAL;
4393                 ti->error = "The device is too small";
4394                 goto bad;
4395         }
4396
4397 try_smaller_buffer:
4398         r = calculate_device_limits(ic);
4399         if (r) {
4400                 if (ic->meta_dev) {
4401                         if (ic->log2_buffer_sectors > 3) {
4402                                 ic->log2_buffer_sectors--;
4403                                 goto try_smaller_buffer;
4404                         }
4405                 }
4406                 ti->error = "The device is too small";
4407                 goto bad;
4408         }
4409
4410         if (log2_sectors_per_bitmap_bit < 0)
4411                 log2_sectors_per_bitmap_bit = __fls(DEFAULT_SECTORS_PER_BITMAP_BIT);
4412         if (log2_sectors_per_bitmap_bit < ic->sb->log2_sectors_per_block)
4413                 log2_sectors_per_bitmap_bit = ic->sb->log2_sectors_per_block;
4414
4415         bits_in_journal = ((__u64)ic->journal_section_sectors * ic->journal_sections) << (SECTOR_SHIFT + 3);
4416         if (bits_in_journal > UINT_MAX)
4417                 bits_in_journal = UINT_MAX;
4418         while (bits_in_journal < (ic->provided_data_sectors + ((sector_t)1 << log2_sectors_per_bitmap_bit) - 1) >> log2_sectors_per_bitmap_bit)
4419                 log2_sectors_per_bitmap_bit++;
4420
4421         log2_blocks_per_bitmap_bit = log2_sectors_per_bitmap_bit - ic->sb->log2_sectors_per_block;
4422         ic->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
4423         if (should_write_sb)
4424                 ic->sb->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
4425
4426         n_bitmap_bits = ((ic->provided_data_sectors >> ic->sb->log2_sectors_per_block)
4427                                 + (((sector_t)1 << log2_blocks_per_bitmap_bit) - 1)) >> log2_blocks_per_bitmap_bit;
4428         ic->n_bitmap_blocks = DIV_ROUND_UP(n_bitmap_bits, BITMAP_BLOCK_SIZE * 8);
4429
4430         if (!ic->meta_dev)
4431                 ic->log2_buffer_sectors = min(ic->log2_buffer_sectors, (__u8)__ffs(ic->metadata_run));
4432
4433         if (ti->len > ic->provided_data_sectors) {
4434                 r = -EINVAL;
4435                 ti->error = "Not enough provided sectors for requested mapping size";
4436                 goto bad;
4437         }
4438
4439
4440         threshold = (__u64)ic->journal_entries * (100 - journal_watermark);
4441         threshold += 50;
4442         do_div(threshold, 100);
4443         ic->free_sectors_threshold = threshold;
4444
4445         DEBUG_print("initialized:\n");
4446         DEBUG_print("   integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size));
4447         DEBUG_print("   journal_entry_size %u\n", ic->journal_entry_size);
4448         DEBUG_print("   journal_entries_per_sector %u\n", ic->journal_entries_per_sector);
4449         DEBUG_print("   journal_section_entries %u\n", ic->journal_section_entries);
4450         DEBUG_print("   journal_section_sectors %u\n", ic->journal_section_sectors);
4451         DEBUG_print("   journal_sections %u\n", (unsigned int)le32_to_cpu(ic->sb->journal_sections));
4452         DEBUG_print("   journal_entries %u\n", ic->journal_entries);
4453         DEBUG_print("   log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors);
4454         DEBUG_print("   data_device_sectors 0x%llx\n", bdev_nr_sectors(ic->dev->bdev));
4455         DEBUG_print("   initial_sectors 0x%x\n", ic->initial_sectors);
4456         DEBUG_print("   metadata_run 0x%x\n", ic->metadata_run);
4457         DEBUG_print("   log2_metadata_run %d\n", ic->log2_metadata_run);
4458         DEBUG_print("   provided_data_sectors 0x%llx (%llu)\n", ic->provided_data_sectors, ic->provided_data_sectors);
4459         DEBUG_print("   log2_buffer_sectors %u\n", ic->log2_buffer_sectors);
4460         DEBUG_print("   bits_in_journal %llu\n", bits_in_journal);
4461
4462         if (ic->recalculate_flag && !(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))) {
4463                 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
4464                 ic->sb->recalc_sector = cpu_to_le64(0);
4465         }
4466
4467         if (ic->internal_hash) {
4468                 ic->recalc_wq = alloc_workqueue("dm-integrity-recalc", WQ_MEM_RECLAIM, 1);
4469                 if (!ic->recalc_wq) {
4470                         ti->error = "Cannot allocate workqueue";
4471                         r = -ENOMEM;
4472                         goto bad;
4473                 }
4474                 INIT_WORK(&ic->recalc_work, integrity_recalc);
4475         } else {
4476                 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
4477                         ti->error = "Recalculate can only be specified with internal_hash";
4478                         r = -EINVAL;
4479                         goto bad;
4480                 }
4481         }
4482
4483         if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
4484             le64_to_cpu(ic->sb->recalc_sector) < ic->provided_data_sectors &&
4485             dm_integrity_disable_recalculate(ic)) {
4486                 ti->error = "Recalculating with HMAC is disabled for security reasons - if you really need it, use the argument \"legacy_recalculate\"";
4487                 r = -EOPNOTSUPP;
4488                 goto bad;
4489         }
4490
4491         ic->bufio = dm_bufio_client_create(ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev,
4492                         1U << (SECTOR_SHIFT + ic->log2_buffer_sectors), 1, 0, NULL, NULL, 0);
4493         if (IS_ERR(ic->bufio)) {
4494                 r = PTR_ERR(ic->bufio);
4495                 ti->error = "Cannot initialize dm-bufio";
4496                 ic->bufio = NULL;
4497                 goto bad;
4498         }
4499         dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors);
4500
4501         if (ic->mode != 'R') {
4502                 r = create_journal(ic, &ti->error);
4503                 if (r)
4504                         goto bad;
4505
4506         }
4507
4508         if (ic->mode == 'B') {
4509                 unsigned int i;
4510                 unsigned int n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
4511
4512                 ic->recalc_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4513                 if (!ic->recalc_bitmap) {
4514                         r = -ENOMEM;
4515                         goto bad;
4516                 }
4517                 ic->may_write_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4518                 if (!ic->may_write_bitmap) {
4519                         r = -ENOMEM;
4520                         goto bad;
4521                 }
4522                 ic->bbs = kvmalloc_array(ic->n_bitmap_blocks, sizeof(struct bitmap_block_status), GFP_KERNEL);
4523                 if (!ic->bbs) {
4524                         r = -ENOMEM;
4525                         goto bad;
4526                 }
4527                 INIT_DELAYED_WORK(&ic->bitmap_flush_work, bitmap_flush_work);
4528                 for (i = 0; i < ic->n_bitmap_blocks; i++) {
4529                         struct bitmap_block_status *bbs = &ic->bbs[i];
4530                         unsigned int sector, pl_index, pl_offset;
4531
4532                         INIT_WORK(&bbs->work, bitmap_block_work);
4533                         bbs->ic = ic;
4534                         bbs->idx = i;
4535                         bio_list_init(&bbs->bio_queue);
4536                         spin_lock_init(&bbs->bio_queue_lock);
4537
4538                         sector = i * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT);
4539                         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
4540                         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
4541
4542                         bbs->bitmap = lowmem_page_address(ic->journal[pl_index].page) + pl_offset;
4543                 }
4544         }
4545
4546         if (should_write_sb) {
4547                 init_journal(ic, 0, ic->journal_sections, 0);
4548                 r = dm_integrity_failed(ic);
4549                 if (unlikely(r)) {
4550                         ti->error = "Error initializing journal";
4551                         goto bad;
4552                 }
4553                 r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA);
4554                 if (r) {
4555                         ti->error = "Error initializing superblock";
4556                         goto bad;
4557                 }
4558                 ic->just_formatted = true;
4559         }
4560
4561         if (!ic->meta_dev) {
4562                 r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors);
4563                 if (r)
4564                         goto bad;
4565         }
4566         if (ic->mode == 'B') {
4567                 unsigned int max_io_len;
4568
4569                 max_io_len = ((sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit) * (BITMAP_BLOCK_SIZE * 8);
4570                 if (!max_io_len)
4571                         max_io_len = 1U << 31;
4572                 DEBUG_print("max_io_len: old %u, new %u\n", ti->max_io_len, max_io_len);
4573                 if (!ti->max_io_len || ti->max_io_len > max_io_len) {
4574                         r = dm_set_target_max_io_len(ti, max_io_len);
4575                         if (r)
4576                                 goto bad;
4577                 }
4578         }
4579
4580         if (!ic->internal_hash)
4581                 dm_integrity_set(ti, ic);
4582
4583         ti->num_flush_bios = 1;
4584         ti->flush_supported = true;
4585         if (ic->discard)
4586                 ti->num_discard_bios = 1;
4587
4588         dm_audit_log_ctr(DM_MSG_PREFIX, ti, 1);
4589         return 0;
4590
4591 bad:
4592         dm_audit_log_ctr(DM_MSG_PREFIX, ti, 0);
4593         dm_integrity_dtr(ti);
4594         return r;
4595 }
4596
4597 static void dm_integrity_dtr(struct dm_target *ti)
4598 {
4599         struct dm_integrity_c *ic = ti->private;
4600
4601         BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
4602         BUG_ON(!list_empty(&ic->wait_list));
4603
4604         if (ic->mode == 'B')
4605                 cancel_delayed_work_sync(&ic->bitmap_flush_work);
4606         if (ic->metadata_wq)
4607                 destroy_workqueue(ic->metadata_wq);
4608         if (ic->wait_wq)
4609                 destroy_workqueue(ic->wait_wq);
4610         if (ic->offload_wq)
4611                 destroy_workqueue(ic->offload_wq);
4612         if (ic->commit_wq)
4613                 destroy_workqueue(ic->commit_wq);
4614         if (ic->writer_wq)
4615                 destroy_workqueue(ic->writer_wq);
4616         if (ic->recalc_wq)
4617                 destroy_workqueue(ic->recalc_wq);
4618         kvfree(ic->bbs);
4619         if (ic->bufio)
4620                 dm_bufio_client_destroy(ic->bufio);
4621         mempool_exit(&ic->journal_io_mempool);
4622         if (ic->io)
4623                 dm_io_client_destroy(ic->io);
4624         if (ic->dev)
4625                 dm_put_device(ti, ic->dev);
4626         if (ic->meta_dev)
4627                 dm_put_device(ti, ic->meta_dev);
4628         dm_integrity_free_page_list(ic->journal);
4629         dm_integrity_free_page_list(ic->journal_io);
4630         dm_integrity_free_page_list(ic->journal_xor);
4631         dm_integrity_free_page_list(ic->recalc_bitmap);
4632         dm_integrity_free_page_list(ic->may_write_bitmap);
4633         if (ic->journal_scatterlist)
4634                 dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist);
4635         if (ic->journal_io_scatterlist)
4636                 dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist);
4637         if (ic->sk_requests) {
4638                 unsigned int i;
4639
4640                 for (i = 0; i < ic->journal_sections; i++) {
4641                         struct skcipher_request *req;
4642
4643                         req = ic->sk_requests[i];
4644                         if (req) {
4645                                 kfree_sensitive(req->iv);
4646                                 skcipher_request_free(req);
4647                         }
4648                 }
4649                 kvfree(ic->sk_requests);
4650         }
4651         kvfree(ic->journal_tree);
4652         if (ic->sb)
4653                 free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT);
4654
4655         if (ic->internal_hash)
4656                 crypto_free_shash(ic->internal_hash);
4657         free_alg(&ic->internal_hash_alg);
4658
4659         if (ic->journal_crypt)
4660                 crypto_free_skcipher(ic->journal_crypt);
4661         free_alg(&ic->journal_crypt_alg);
4662
4663         if (ic->journal_mac)
4664                 crypto_free_shash(ic->journal_mac);
4665         free_alg(&ic->journal_mac_alg);
4666
4667         kfree(ic);
4668         dm_audit_log_dtr(DM_MSG_PREFIX, ti, 1);
4669 }
4670
4671 static struct target_type integrity_target = {
4672         .name                   = "integrity",
4673         .version                = {1, 10, 0},
4674         .module                 = THIS_MODULE,
4675         .features               = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
4676         .ctr                    = dm_integrity_ctr,
4677         .dtr                    = dm_integrity_dtr,
4678         .map                    = dm_integrity_map,
4679         .postsuspend            = dm_integrity_postsuspend,
4680         .resume                 = dm_integrity_resume,
4681         .status                 = dm_integrity_status,
4682         .iterate_devices        = dm_integrity_iterate_devices,
4683         .io_hints               = dm_integrity_io_hints,
4684 };
4685
4686 static int __init dm_integrity_init(void)
4687 {
4688         int r;
4689
4690         journal_io_cache = kmem_cache_create("integrity_journal_io",
4691                                              sizeof(struct journal_io), 0, 0, NULL);
4692         if (!journal_io_cache) {
4693                 DMERR("can't allocate journal io cache");
4694                 return -ENOMEM;
4695         }
4696
4697         r = dm_register_target(&integrity_target);
4698         if (r < 0) {
4699                 kmem_cache_destroy(journal_io_cache);
4700                 return r;
4701         }
4702
4703         return 0;
4704 }
4705
4706 static void __exit dm_integrity_exit(void)
4707 {
4708         dm_unregister_target(&integrity_target);
4709         kmem_cache_destroy(journal_io_cache);
4710 }
4711
4712 module_init(dm_integrity_init);
4713 module_exit(dm_integrity_exit);
4714
4715 MODULE_AUTHOR("Milan Broz");
4716 MODULE_AUTHOR("Mikulas Patocka");
4717 MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension");
4718 MODULE_LICENSE("GPL");