drivers/md/dm-integrity.c

   1 /*
   2  * Copyright (C) 2016-2017 Red Hat, Inc. All rights reserved.
   3  * Copyright (C) 2016-2017 Milan Broz
   4  * Copyright (C) 2016-2017 Mikulas Patocka
   5  *
   6  * This file is released under the GPL.
   7  */
   8
   9 #include "dm-bio-record.h"
  10
  11 #include <linux/compiler.h>
  12 #include <linux/module.h>
  13 #include <linux/device-mapper.h>
  14 #include <linux/dm-io.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/sort.h>
  17 #include <linux/rbtree.h>
  18 #include <linux/delay.h>
  19 #include <linux/random.h>
  20 #include <linux/reboot.h>
  21 #include <crypto/hash.h>
  22 #include <crypto/skcipher.h>
  23 #include <linux/async_tx.h>
  24 #include <linux/dm-bufio.h>
  25
  26 #define DM_MSG_PREFIX "integrity"
  27
  28 #define DEFAULT_INTERLEAVE_SECTORS      32768
  29 #define DEFAULT_JOURNAL_SIZE_FACTOR     7
  30 #define DEFAULT_SECTORS_PER_BITMAP_BIT  32768
  31 #define DEFAULT_BUFFER_SECTORS          128
  32 #define DEFAULT_JOURNAL_WATERMARK       50
  33 #define DEFAULT_SYNC_MSEC               10000
  34 #define DEFAULT_MAX_JOURNAL_SECTORS     131072
  35 #define MIN_LOG2_INTERLEAVE_SECTORS     3
  36 #define MAX_LOG2_INTERLEAVE_SECTORS     31
  37 #define METADATA_WORKQUEUE_MAX_ACTIVE   16
  38 #define RECALC_SECTORS                  32768
  39 #define RECALC_WRITE_SUPER              16
  40 #define BITMAP_BLOCK_SIZE               4096    /* don't change it */
  41 #define BITMAP_FLUSH_INTERVAL           (10 * HZ)
  42 #define DISCARD_FILLER                  0xf6
  43 #define SALT_SIZE                       16
  44
  45 /*
  46  * Warning - DEBUG_PRINT prints security-sensitive data to the log,
  47  * so it should not be enabled in the official kernel
  48  */
  49 //#define DEBUG_PRINT
  50 //#define INTERNAL_VERIFY
  51
  52 /*
  53  * On disk structures
  54  */
  55
  56 #define SB_MAGIC                        "integrt"
  57 #define SB_VERSION_1                    1
  58 #define SB_VERSION_2                    2
  59 #define SB_VERSION_3                    3
  60 #define SB_VERSION_4                    4
  61 #define SB_VERSION_5                    5
  62 #define SB_SECTORS                      8
  63 #define MAX_SECTORS_PER_BLOCK           8
  64
  65 struct superblock {
  66         __u8 magic[8];
  67         __u8 version;
  68         __u8 log2_interleave_sectors;
  69         __le16 integrity_tag_size;
  70         __le32 journal_sections;
  71         __le64 provided_data_sectors;   /* userspace uses this value */
  72         __le32 flags;
  73         __u8 log2_sectors_per_block;
  74         __u8 log2_blocks_per_bitmap_bit;
  75         __u8 pad[2];
  76         __le64 recalc_sector;
  77         __u8 pad2[8];
  78         __u8 salt[SALT_SIZE];
  79 };
  80
  81 #define SB_FLAG_HAVE_JOURNAL_MAC        0x1
  82 #define SB_FLAG_RECALCULATING           0x2
  83 #define SB_FLAG_DIRTY_BITMAP            0x4
  84 #define SB_FLAG_FIXED_PADDING           0x8
  85 #define SB_FLAG_FIXED_HMAC              0x10
  86
  87 #define JOURNAL_ENTRY_ROUNDUP           8
  88
  89 typedef __le64 commit_id_t;
  90 #define JOURNAL_MAC_PER_SECTOR          8
  91
  92 struct journal_entry {
  93         union {
  94                 struct {
  95                         __le32 sector_lo;
  96                         __le32 sector_hi;
  97                 } s;
  98                 __le64 sector;
  99         } u;
 100         commit_id_t last_bytes[];
 101         /* __u8 tag[0]; */
 102 };
 103
 104 #define journal_entry_tag(ic, je)               ((__u8 *)&(je)->last_bytes[(ic)->sectors_per_block])
 105
 106 #if BITS_PER_LONG == 64
 107 #define journal_entry_set_sector(je, x)         do { smp_wmb(); WRITE_ONCE((je)->u.sector, cpu_to_le64(x)); } while (0)
 108 #else
 109 #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)
 110 #endif
 111 #define journal_entry_get_sector(je)            le64_to_cpu((je)->u.sector)
 112 #define journal_entry_is_unused(je)             ((je)->u.s.sector_hi == cpu_to_le32(-1))
 113 #define journal_entry_set_unused(je)            do { ((je)->u.s.sector_hi = cpu_to_le32(-1)); } while (0)
 114 #define journal_entry_is_inprogress(je)         ((je)->u.s.sector_hi == cpu_to_le32(-2))
 115 #define journal_entry_set_inprogress(je)        do { ((je)->u.s.sector_hi = cpu_to_le32(-2)); } while (0)
 116
 117 #define JOURNAL_BLOCK_SECTORS           8
 118 #define JOURNAL_SECTOR_DATA             ((1 << SECTOR_SHIFT) - sizeof(commit_id_t))
 119 #define JOURNAL_MAC_SIZE                (JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS)
 120
 121 struct journal_sector {
 122         __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR];
 123         __u8 mac[JOURNAL_MAC_PER_SECTOR];
 124         commit_id_t commit_id;
 125 };
 126
 127 #define MAX_TAG_SIZE                    (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
 128
 129 #define METADATA_PADDING_SECTORS        8
 130
 131 #define N_COMMIT_IDS                    4
 132
 133 static unsigned char prev_commit_seq(unsigned char seq)
 134 {
 135         return (seq + N_COMMIT_IDS - 1) % N_COMMIT_IDS;
 136 }
 137
 138 static unsigned char next_commit_seq(unsigned char seq)
 139 {
 140         return (seq + 1) % N_COMMIT_IDS;
 141 }
 142
 143 /*
 144  * In-memory structures
 145  */
 146
 147 struct journal_node {
 148         struct rb_node node;
 149         sector_t sector;
 150 };
 151
 152 struct alg_spec {
 153         char *alg_string;
 154         char *key_string;
 155         __u8 *key;
 156         unsigned key_size;
 157 };
 158
 159 struct dm_integrity_c {
 160         struct dm_dev *dev;
 161         struct dm_dev *meta_dev;
 162         unsigned tag_size;
 163         __s8 log2_tag_size;
 164         sector_t start;
 165         mempool_t journal_io_mempool;
 166         struct dm_io_client *io;
 167         struct dm_bufio_client *bufio;
 168         struct workqueue_struct *metadata_wq;
 169         struct superblock *sb;
 170         unsigned journal_pages;
 171         unsigned n_bitmap_blocks;
 172
 173         struct page_list *journal;
 174         struct page_list *journal_io;
 175         struct page_list *journal_xor;
 176         struct page_list *recalc_bitmap;
 177         struct page_list *may_write_bitmap;
 178         struct bitmap_block_status *bbs;
 179         unsigned bitmap_flush_interval;
 180         int synchronous_mode;
 181         struct bio_list synchronous_bios;
 182         struct delayed_work bitmap_flush_work;
 183
 184         struct crypto_skcipher *journal_crypt;
 185         struct scatterlist **journal_scatterlist;
 186         struct scatterlist **journal_io_scatterlist;
 187         struct skcipher_request **sk_requests;
 188
 189         struct crypto_shash *journal_mac;
 190
 191         struct journal_node *journal_tree;
 192         struct rb_root journal_tree_root;
 193
 194         sector_t provided_data_sectors;
 195
 196         unsigned short journal_entry_size;
 197         unsigned char journal_entries_per_sector;
 198         unsigned char journal_section_entries;
 199         unsigned short journal_section_sectors;
 200         unsigned journal_sections;
 201         unsigned journal_entries;
 202         sector_t data_device_sectors;
 203         sector_t meta_device_sectors;
 204         unsigned initial_sectors;
 205         unsigned metadata_run;
 206         __s8 log2_metadata_run;
 207         __u8 log2_buffer_sectors;
 208         __u8 sectors_per_block;
 209         __u8 log2_blocks_per_bitmap_bit;
 210
 211         unsigned char mode;
 212
 213         int failed;
 214
 215         struct crypto_shash *internal_hash;
 216
 217         struct dm_target *ti;
 218
 219         /* these variables are locked with endio_wait.lock */
 220         struct rb_root in_progress;
 221         struct list_head wait_list;
 222         wait_queue_head_t endio_wait;
 223         struct workqueue_struct *wait_wq;
 224         struct workqueue_struct *offload_wq;
 225
 226         unsigned char commit_seq;
 227         commit_id_t commit_ids[N_COMMIT_IDS];
 228
 229         unsigned committed_section;
 230         unsigned n_committed_sections;
 231
 232         unsigned uncommitted_section;
 233         unsigned n_uncommitted_sections;
 234
 235         unsigned free_section;
 236         unsigned char free_section_entry;
 237         unsigned free_sectors;
 238
 239         unsigned free_sectors_threshold;
 240
 241         struct workqueue_struct *commit_wq;
 242         struct work_struct commit_work;
 243
 244         struct workqueue_struct *writer_wq;
 245         struct work_struct writer_work;
 246
 247         struct workqueue_struct *recalc_wq;
 248         struct work_struct recalc_work;
 249         u8 *recalc_buffer;
 250         u8 *recalc_tags;
 251
 252         struct bio_list flush_bio_list;
 253
 254         unsigned long autocommit_jiffies;
 255         struct timer_list autocommit_timer;
 256         unsigned autocommit_msec;
 257
 258         wait_queue_head_t copy_to_journal_wait;
 259
 260         struct completion crypto_backoff;
 261
 262         bool journal_uptodate;
 263         bool just_formatted;
 264         bool recalculate_flag;
 265         bool reset_recalculate_flag;
 266         bool discard;
 267         bool fix_padding;
 268         bool fix_hmac;
 269         bool legacy_recalculate;
 270
 271         struct alg_spec internal_hash_alg;
 272         struct alg_spec journal_crypt_alg;
 273         struct alg_spec journal_mac_alg;
 274
 275         atomic64_t number_of_mismatches;
 276
 277         struct notifier_block reboot_notifier;
 278 };
 279
 280 struct dm_integrity_range {
 281         sector_t logical_sector;
 282         sector_t n_sectors;
 283         bool waiting;
 284         union {
 285                 struct rb_node node;
 286                 struct {
 287                         struct task_struct *task;
 288                         struct list_head wait_entry;
 289                 };
 290         };
 291 };
 292
 293 struct dm_integrity_io {
 294         struct work_struct work;
 295
 296         struct dm_integrity_c *ic;
 297         enum req_opf op;
 298         bool fua;
 299
 300         struct dm_integrity_range range;
 301
 302         sector_t metadata_block;
 303         unsigned metadata_offset;
 304
 305         atomic_t in_flight;
 306         blk_status_t bi_status;
 307
 308         struct completion *completion;
 309
 310         struct dm_bio_details bio_details;
 311 };
 312
 313 struct journal_completion {
 314         struct dm_integrity_c *ic;
 315         atomic_t in_flight;
 316         struct completion comp;
 317 };
 318
 319 struct journal_io {
 320         struct dm_integrity_range range;
 321         struct journal_completion *comp;
 322 };
 323
 324 struct bitmap_block_status {
 325         struct work_struct work;
 326         struct dm_integrity_c *ic;
 327         unsigned idx;
 328         unsigned long *bitmap;
 329         struct bio_list bio_queue;
 330         spinlock_t bio_queue_lock;
 331
 332 };
 333
 334 static struct kmem_cache *journal_io_cache;
 335
 336 #define JOURNAL_IO_MEMPOOL      32
 337
 338 #ifdef DEBUG_PRINT
 339 #define DEBUG_print(x, ...)     printk(KERN_DEBUG x, ##__VA_ARGS__)
 340 static void __DEBUG_bytes(__u8 *bytes, size_t len, const char *msg, ...)
 341 {
 342         va_list args;
 343         va_start(args, msg);
 344         vprintk(msg, args);
 345         va_end(args);
 346         if (len)
 347                 pr_cont(":");
 348         while (len) {
 349                 pr_cont(" %02x", *bytes);
 350                 bytes++;
 351                 len--;
 352         }
 353         pr_cont("\n");
 354 }
 355 #define DEBUG_bytes(bytes, len, msg, ...)       __DEBUG_bytes(bytes, len, KERN_DEBUG msg, ##__VA_ARGS__)
 356 #else
 357 #define DEBUG_print(x, ...)                     do { } while (0)
 358 #define DEBUG_bytes(bytes, len, msg, ...)       do { } while (0)
 359 #endif
 360
 361 static void dm_integrity_prepare(struct request *rq)
 362 {
 363 }
 364
 365 static void dm_integrity_complete(struct request *rq, unsigned int nr_bytes)
 366 {
 367 }
 368
 369 /*
 370  * DM Integrity profile, protection is performed layer above (dm-crypt)
 371  */
 372 static const struct blk_integrity_profile dm_integrity_profile = {
 373         .name                   = "DM-DIF-EXT-TAG",
 374         .generate_fn            = NULL,
 375         .verify_fn              = NULL,
 376         .prepare_fn             = dm_integrity_prepare,
 377         .complete_fn            = dm_integrity_complete,
 378 };
 379
 380 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map);
 381 static void integrity_bio_wait(struct work_struct *w);
 382 static void dm_integrity_dtr(struct dm_target *ti);
 383
 384 static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err)
 385 {
 386         if (err == -EILSEQ)
 387                 atomic64_inc(&ic->number_of_mismatches);
 388         if (!cmpxchg(&ic->failed, 0, err))
 389                 DMERR("Error on %s: %d", msg, err);
 390 }
 391
 392 static int dm_integrity_failed(struct dm_integrity_c *ic)
 393 {
 394         return READ_ONCE(ic->failed);
 395 }
 396
 397 static bool dm_integrity_disable_recalculate(struct dm_integrity_c *ic)
 398 {
 399         if (ic->legacy_recalculate)
 400                 return false;
 401         if (!(ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) ?
 402             ic->internal_hash_alg.key || ic->journal_mac_alg.key :
 403             ic->internal_hash_alg.key && !ic->journal_mac_alg.key)
 404                 return true;
 405         return false;
 406 }
 407
 408 static commit_id_t dm_integrity_commit_id(struct dm_integrity_c *ic, unsigned i,
 409                                           unsigned j, unsigned char seq)
 410 {
 411         /*
 412          * Xor the number with section and sector, so that if a piece of
 413          * journal is written at wrong place, it is detected.
 414          */
 415         return ic->commit_ids[seq] ^ cpu_to_le64(((__u64)i << 32) ^ j);
 416 }
 417
 418 static void get_area_and_offset(struct dm_integrity_c *ic, sector_t data_sector,
 419                                 sector_t *area, sector_t *offset)
 420 {
 421         if (!ic->meta_dev) {
 422                 __u8 log2_interleave_sectors = ic->sb->log2_interleave_sectors;
 423                 *area = data_sector >> log2_interleave_sectors;
 424                 *offset = (unsigned)data_sector & ((1U << log2_interleave_sectors) - 1);
 425         } else {
 426                 *area = 0;
 427                 *offset = data_sector;
 428         }
 429 }
 430
 431 #define sector_to_block(ic, n)                                          \
 432 do {                                                                    \
 433         BUG_ON((n) & (unsigned)((ic)->sectors_per_block - 1));          \
 434         (n) >>= (ic)->sb->log2_sectors_per_block;                       \
 435 } while (0)
 436
 437 static __u64 get_metadata_sector_and_offset(struct dm_integrity_c *ic, sector_t area,
 438                                             sector_t offset, unsigned *metadata_offset)
 439 {
 440         __u64 ms;
 441         unsigned mo;
 442
 443         ms = area << ic->sb->log2_interleave_sectors;
 444         if (likely(ic->log2_metadata_run >= 0))
 445                 ms += area << ic->log2_metadata_run;
 446         else
 447                 ms += area * ic->metadata_run;
 448         ms >>= ic->log2_buffer_sectors;
 449
 450         sector_to_block(ic, offset);
 451
 452         if (likely(ic->log2_tag_size >= 0)) {
 453                 ms += offset >> (SECTOR_SHIFT + ic->log2_buffer_sectors - ic->log2_tag_size);
 454                 mo = (offset << ic->log2_tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
 455         } else {
 456                 ms += (__u64)offset * ic->tag_size >> (SECTOR_SHIFT + ic->log2_buffer_sectors);
 457                 mo = (offset * ic->tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
 458         }
 459         *metadata_offset = mo;
 460         return ms;
 461 }
 462
 463 static sector_t get_data_sector(struct dm_integrity_c *ic, sector_t area, sector_t offset)
 464 {
 465         sector_t result;
 466
 467         if (ic->meta_dev)
 468                 return offset;
 469
 470         result = area << ic->sb->log2_interleave_sectors;
 471         if (likely(ic->log2_metadata_run >= 0))
 472                 result += (area + 1) << ic->log2_metadata_run;
 473         else
 474                 result += (area + 1) * ic->metadata_run;
 475
 476         result += (sector_t)ic->initial_sectors + offset;
 477         result += ic->start;
 478
 479         return result;
 480 }
 481
 482 static void wraparound_section(struct dm_integrity_c *ic, unsigned *sec_ptr)
 483 {
 484         if (unlikely(*sec_ptr >= ic->journal_sections))
 485                 *sec_ptr -= ic->journal_sections;
 486 }
 487
 488 static void sb_set_version(struct dm_integrity_c *ic)
 489 {
 490         if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC))
 491                 ic->sb->version = SB_VERSION_5;
 492         else if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING))
 493                 ic->sb->version = SB_VERSION_4;
 494         else if (ic->mode == 'B' || ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP))
 495                 ic->sb->version = SB_VERSION_3;
 496         else if (ic->meta_dev || ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
 497                 ic->sb->version = SB_VERSION_2;
 498         else
 499                 ic->sb->version = SB_VERSION_1;
 500 }
 501
 502 static int sb_mac(struct dm_integrity_c *ic, bool wr)
 503 {
 504         SHASH_DESC_ON_STACK(desc, ic->journal_mac);
 505         int r;
 506         unsigned size = crypto_shash_digestsize(ic->journal_mac);
 507
 508         if (sizeof(struct superblock) + size > 1 << SECTOR_SHIFT) {
 509                 dm_integrity_io_error(ic, "digest is too long", -EINVAL);
 510                 return -EINVAL;
 511         }
 512
 513         desc->tfm = ic->journal_mac;
 514
 515         r = crypto_shash_init(desc);
 516         if (unlikely(r < 0)) {
 517                 dm_integrity_io_error(ic, "crypto_shash_init", r);
 518                 return r;
 519         }
 520
 521         r = crypto_shash_update(desc, (__u8 *)ic->sb, (1 << SECTOR_SHIFT) - size);
 522         if (unlikely(r < 0)) {
 523                 dm_integrity_io_error(ic, "crypto_shash_update", r);
 524                 return r;
 525         }
 526
 527         if (likely(wr)) {
 528                 r = crypto_shash_final(desc, (__u8 *)ic->sb + (1 << SECTOR_SHIFT) - size);
 529                 if (unlikely(r < 0)) {
 530                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 531                         return r;
 532                 }
 533         } else {
 534                 __u8 result[HASH_MAX_DIGESTSIZE];
 535                 r = crypto_shash_final(desc, result);
 536                 if (unlikely(r < 0)) {
 537                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 538                         return r;
 539                 }
 540                 if (memcmp((__u8 *)ic->sb + (1 << SECTOR_SHIFT) - size, result, size)) {
 541                         dm_integrity_io_error(ic, "superblock mac", -EILSEQ);
 542                         return -EILSEQ;
 543                 }
 544         }
 545
 546         return 0;
 547 }
 548
 549 static int sync_rw_sb(struct dm_integrity_c *ic, int op, int op_flags)
 550 {
 551         struct dm_io_request io_req;
 552         struct dm_io_region io_loc;
 553         int r;
 554
 555         io_req.bi_op = op;
 556         io_req.bi_op_flags = op_flags;
 557         io_req.mem.type = DM_IO_KMEM;
 558         io_req.mem.ptr.addr = ic->sb;
 559         io_req.notify.fn = NULL;
 560         io_req.client = ic->io;
 561         io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
 562         io_loc.sector = ic->start;
 563         io_loc.count = SB_SECTORS;
 564
 565         if (op == REQ_OP_WRITE) {
 566                 sb_set_version(ic);
 567                 if (ic->journal_mac && ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
 568                         r = sb_mac(ic, true);
 569                         if (unlikely(r))
 570                                 return r;
 571                 }
 572         }
 573
 574         r = dm_io(&io_req, 1, &io_loc, NULL);
 575         if (unlikely(r))
 576                 return r;
 577
 578         if (op == REQ_OP_READ) {
 579                 if (ic->mode != 'R' && ic->journal_mac && ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
 580                         r = sb_mac(ic, false);
 581                         if (unlikely(r))
 582                                 return r;
 583                 }
 584         }
 585
 586         return 0;
 587 }
 588
 589 #define BITMAP_OP_TEST_ALL_SET          0
 590 #define BITMAP_OP_TEST_ALL_CLEAR        1
 591 #define BITMAP_OP_SET                   2
 592 #define BITMAP_OP_CLEAR                 3
 593
 594 static bool block_bitmap_op(struct dm_integrity_c *ic, struct page_list *bitmap,
 595                             sector_t sector, sector_t n_sectors, int mode)
 596 {
 597         unsigned long bit, end_bit, this_end_bit, page, end_page;
 598         unsigned long *data;
 599
 600         if (unlikely(((sector | n_sectors) & ((1 << ic->sb->log2_sectors_per_block) - 1)) != 0)) {
 601                 DMCRIT("invalid bitmap access (%llx,%llx,%d,%d,%d)",
 602                         sector,
 603                         n_sectors,
 604                         ic->sb->log2_sectors_per_block,
 605                         ic->log2_blocks_per_bitmap_bit,
 606                         mode);
 607                 BUG();
 608         }
 609
 610         if (unlikely(!n_sectors))
 611                 return true;
 612
 613         bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 614         end_bit = (sector + n_sectors - 1) >>
 615                 (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 616
 617         page = bit / (PAGE_SIZE * 8);
 618         bit %= PAGE_SIZE * 8;
 619
 620         end_page = end_bit / (PAGE_SIZE * 8);
 621         end_bit %= PAGE_SIZE * 8;
 622
 623 repeat:
 624         if (page < end_page) {
 625                 this_end_bit = PAGE_SIZE * 8 - 1;
 626         } else {
 627                 this_end_bit = end_bit;
 628         }
 629
 630         data = lowmem_page_address(bitmap[page].page);
 631
 632         if (mode == BITMAP_OP_TEST_ALL_SET) {
 633                 while (bit <= this_end_bit) {
 634                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 635                                 do {
 636                                         if (data[bit / BITS_PER_LONG] != -1)
 637                                                 return false;
 638                                         bit += BITS_PER_LONG;
 639                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 640                                 continue;
 641                         }
 642                         if (!test_bit(bit, data))
 643                                 return false;
 644                         bit++;
 645                 }
 646         } else if (mode == BITMAP_OP_TEST_ALL_CLEAR) {
 647                 while (bit <= this_end_bit) {
 648                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 649                                 do {
 650                                         if (data[bit / BITS_PER_LONG] != 0)
 651                                                 return false;
 652                                         bit += BITS_PER_LONG;
 653                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 654                                 continue;
 655                         }
 656                         if (test_bit(bit, data))
 657                                 return false;
 658                         bit++;
 659                 }
 660         } else if (mode == BITMAP_OP_SET) {
 661                 while (bit <= this_end_bit) {
 662                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 663                                 do {
 664                                         data[bit / BITS_PER_LONG] = -1;
 665                                         bit += BITS_PER_LONG;
 666                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 667                                 continue;
 668                         }
 669                         __set_bit(bit, data);
 670                         bit++;
 671                 }
 672         } else if (mode == BITMAP_OP_CLEAR) {
 673                 if (!bit && this_end_bit == PAGE_SIZE * 8 - 1)
 674                         clear_page(data);
 675                 else while (bit <= this_end_bit) {
 676                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 677                                 do {
 678                                         data[bit / BITS_PER_LONG] = 0;
 679                                         bit += BITS_PER_LONG;
 680                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 681                                 continue;
 682                         }
 683                         __clear_bit(bit, data);
 684                         bit++;
 685                 }
 686         } else {
 687                 BUG();
 688         }
 689
 690         if (unlikely(page < end_page)) {
 691                 bit = 0;
 692                 page++;
 693                 goto repeat;
 694         }
 695
 696         return true;
 697 }
 698
 699 static void block_bitmap_copy(struct dm_integrity_c *ic, struct page_list *dst, struct page_list *src)
 700 {
 701         unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
 702         unsigned i;
 703
 704         for (i = 0; i < n_bitmap_pages; i++) {
 705                 unsigned long *dst_data = lowmem_page_address(dst[i].page);
 706                 unsigned long *src_data = lowmem_page_address(src[i].page);
 707                 copy_page(dst_data, src_data);
 708         }
 709 }
 710
 711 static struct bitmap_block_status *sector_to_bitmap_block(struct dm_integrity_c *ic, sector_t sector)
 712 {
 713         unsigned bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 714         unsigned bitmap_block = bit / (BITMAP_BLOCK_SIZE * 8);
 715
 716         BUG_ON(bitmap_block >= ic->n_bitmap_blocks);
 717         return &ic->bbs[bitmap_block];
 718 }
 719
 720 static void access_journal_check(struct dm_integrity_c *ic, unsigned section, unsigned offset,
 721                                  bool e, const char *function)
 722 {
 723 #if defined(CONFIG_DM_DEBUG) || defined(INTERNAL_VERIFY)
 724         unsigned limit = e ? ic->journal_section_entries : ic->journal_section_sectors;
 725
 726         if (unlikely(section >= ic->journal_sections) ||
 727             unlikely(offset >= limit)) {
 728                 DMCRIT("%s: invalid access at (%u,%u), limit (%u,%u)",
 729                        function, section, offset, ic->journal_sections, limit);
 730                 BUG();
 731         }
 732 #endif
 733 }
 734
 735 static void page_list_location(struct dm_integrity_c *ic, unsigned section, unsigned offset,
 736                                unsigned *pl_index, unsigned *pl_offset)
 737 {
 738         unsigned sector;
 739
 740         access_journal_check(ic, section, offset, false, "page_list_location");
 741
 742         sector = section * ic->journal_section_sectors + offset;
 743
 744         *pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
 745         *pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
 746 }
 747
 748 static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl,
 749                                                unsigned section, unsigned offset, unsigned *n_sectors)
 750 {
 751         unsigned pl_index, pl_offset;
 752         char *va;
 753
 754         page_list_location(ic, section, offset, &pl_index, &pl_offset);
 755
 756         if (n_sectors)
 757                 *n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT;
 758
 759         va = lowmem_page_address(pl[pl_index].page);
 760
 761         return (struct journal_sector *)(va + pl_offset);
 762 }
 763
 764 static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset)
 765 {
 766         return access_page_list(ic, ic->journal, section, offset, NULL);
 767 }
 768
 769 static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned section, unsigned n)
 770 {
 771         unsigned rel_sector, offset;
 772         struct journal_sector *js;
 773
 774         access_journal_check(ic, section, n, true, "access_journal_entry");
 775
 776         rel_sector = n % JOURNAL_BLOCK_SECTORS;
 777         offset = n / JOURNAL_BLOCK_SECTORS;
 778
 779         js = access_journal(ic, section, rel_sector);
 780         return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size);
 781 }
 782
 783 static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned section, unsigned n)
 784 {
 785         n <<= ic->sb->log2_sectors_per_block;
 786
 787         n += JOURNAL_BLOCK_SECTORS;
 788
 789         access_journal_check(ic, section, n, false, "access_journal_data");
 790
 791         return access_journal(ic, section, n);
 792 }
 793
 794 static void section_mac(struct dm_integrity_c *ic, unsigned section, __u8 result[JOURNAL_MAC_SIZE])
 795 {
 796         SHASH_DESC_ON_STACK(desc, ic->journal_mac);
 797         int r;
 798         unsigned j, size;
 799
 800         desc->tfm = ic->journal_mac;
 801
 802         r = crypto_shash_init(desc);
 803         if (unlikely(r < 0)) {
 804                 dm_integrity_io_error(ic, "crypto_shash_init", r);
 805                 goto err;
 806         }
 807
 808         if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
 809                 __le64 section_le;
 810
 811                 r = crypto_shash_update(desc, (__u8 *)&ic->sb->salt, SALT_SIZE);
 812                 if (unlikely(r < 0)) {
 813                         dm_integrity_io_error(ic, "crypto_shash_update", r);
 814                         goto err;
 815                 }
 816
 817                 section_le = cpu_to_le64(section);
 818                 r = crypto_shash_update(desc, (__u8 *)&section_le, sizeof section_le);
 819                 if (unlikely(r < 0)) {
 820                         dm_integrity_io_error(ic, "crypto_shash_update", r);
 821                         goto err;
 822                 }
 823         }
 824
 825         for (j = 0; j < ic->journal_section_entries; j++) {
 826                 struct journal_entry *je = access_journal_entry(ic, section, j);
 827                 r = crypto_shash_update(desc, (__u8 *)&je->u.sector, sizeof je->u.sector);
 828                 if (unlikely(r < 0)) {
 829                         dm_integrity_io_error(ic, "crypto_shash_update", r);
 830                         goto err;
 831                 }
 832         }
 833
 834         size = crypto_shash_digestsize(ic->journal_mac);
 835
 836         if (likely(size <= JOURNAL_MAC_SIZE)) {
 837                 r = crypto_shash_final(desc, result);
 838                 if (unlikely(r < 0)) {
 839                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 840                         goto err;
 841                 }
 842                 memset(result + size, 0, JOURNAL_MAC_SIZE - size);
 843         } else {
 844                 __u8 digest[HASH_MAX_DIGESTSIZE];
 845
 846                 if (WARN_ON(size > sizeof(digest))) {
 847                         dm_integrity_io_error(ic, "digest_size", -EINVAL);
 848                         goto err;
 849                 }
 850                 r = crypto_shash_final(desc, digest);
 851                 if (unlikely(r < 0)) {
 852                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 853                         goto err;
 854                 }
 855                 memcpy(result, digest, JOURNAL_MAC_SIZE);
 856         }
 857
 858         return;
 859 err:
 860         memset(result, 0, JOURNAL_MAC_SIZE);
 861 }
 862
 863 static void rw_section_mac(struct dm_integrity_c *ic, unsigned section, bool wr)
 864 {
 865         __u8 result[JOURNAL_MAC_SIZE];
 866         unsigned j;
 867
 868         if (!ic->journal_mac)
 869                 return;
 870
 871         section_mac(ic, section, result);
 872
 873         for (j = 0; j < JOURNAL_BLOCK_SECTORS; j++) {
 874                 struct journal_sector *js = access_journal(ic, section, j);
 875
 876                 if (likely(wr))
 877                         memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR);
 878                 else {
 879                         if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR))
 880                                 dm_integrity_io_error(ic, "journal mac", -EILSEQ);
 881                 }
 882         }
 883 }
 884
 885 static void complete_journal_op(void *context)
 886 {
 887         struct journal_completion *comp = context;
 888         BUG_ON(!atomic_read(&comp->in_flight));
 889         if (likely(atomic_dec_and_test(&comp->in_flight)))
 890                 complete(&comp->comp);
 891 }
 892
 893 static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
 894                         unsigned n_sections, struct journal_completion *comp)
 895 {
 896         struct async_submit_ctl submit;
 897         size_t n_bytes = (size_t)(n_sections * ic->journal_section_sectors) << SECTOR_SHIFT;
 898         unsigned pl_index, pl_offset, section_index;
 899         struct page_list *source_pl, *target_pl;
 900
 901         if (likely(encrypt)) {
 902                 source_pl = ic->journal;
 903                 target_pl = ic->journal_io;
 904         } else {
 905                 source_pl = ic->journal_io;
 906                 target_pl = ic->journal;
 907         }
 908
 909         page_list_location(ic, section, 0, &pl_index, &pl_offset);
 910
 911         atomic_add(roundup(pl_offset + n_bytes, PAGE_SIZE) >> PAGE_SHIFT, &comp->in_flight);
 912
 913         init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, complete_journal_op, comp, NULL);
 914
 915         section_index = pl_index;
 916
 917         do {
 918                 size_t this_step;
 919                 struct page *src_pages[2];
 920                 struct page *dst_page;
 921
 922                 while (unlikely(pl_index == section_index)) {
 923                         unsigned dummy;
 924                         if (likely(encrypt))
 925                                 rw_section_mac(ic, section, true);
 926                         section++;
 927                         n_sections--;
 928                         if (!n_sections)
 929                                 break;
 930                         page_list_location(ic, section, 0, &section_index, &dummy);
 931                 }
 932
 933                 this_step = min(n_bytes, (size_t)PAGE_SIZE - pl_offset);
 934                 dst_page = target_pl[pl_index].page;
 935                 src_pages[0] = source_pl[pl_index].page;
 936                 src_pages[1] = ic->journal_xor[pl_index].page;
 937
 938                 async_xor(dst_page, src_pages, pl_offset, 2, this_step, &submit);
 939
 940                 pl_index++;
 941                 pl_offset = 0;
 942                 n_bytes -= this_step;
 943         } while (n_bytes);
 944
 945         BUG_ON(n_sections);
 946
 947         async_tx_issue_pending_all();
 948 }
 949
 950 static void complete_journal_encrypt(struct crypto_async_request *req, int err)
 951 {
 952         struct journal_completion *comp = req->data;
 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         skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
 967                                       complete_journal_encrypt, comp);
 968         if (likely(encrypt))
 969                 r = crypto_skcipher_encrypt(req);
 970         else
 971                 r = crypto_skcipher_decrypt(req);
 972         if (likely(!r))
 973                 return false;
 974         if (likely(r == -EINPROGRESS))
 975                 return true;
 976         if (likely(r == -EBUSY)) {
 977                 wait_for_completion(&comp->ic->crypto_backoff);
 978                 reinit_completion(&comp->ic->crypto_backoff);
 979                 return true;
 980         }
 981         dm_integrity_io_error(comp->ic, "encrypt", r);
 982         return false;
 983 }
 984
 985 static void crypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
 986                           unsigned n_sections, struct journal_completion *comp)
 987 {
 988         struct scatterlist **source_sg;
 989         struct scatterlist **target_sg;
 990
 991         atomic_add(2, &comp->in_flight);
 992
 993         if (likely(encrypt)) {
 994                 source_sg = ic->journal_scatterlist;
 995                 target_sg = ic->journal_io_scatterlist;
 996         } else {
 997                 source_sg = ic->journal_io_scatterlist;
 998                 target_sg = ic->journal_scatterlist;
 999         }
1000
1001         do {
1002                 struct skcipher_request *req;
1003                 unsigned ivsize;
1004                 char *iv;
1005
1006                 if (likely(encrypt))
1007                         rw_section_mac(ic, section, true);
1008
1009                 req = ic->sk_requests[section];
1010                 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
1011                 iv = req->iv;
1012
1013                 memcpy(iv, iv + ivsize, ivsize);
1014
1015                 req->src = source_sg[section];
1016                 req->dst = target_sg[section];
1017
1018                 if (unlikely(do_crypt(encrypt, req, comp)))
1019                         atomic_inc(&comp->in_flight);
1020
1021                 section++;
1022                 n_sections--;
1023         } while (n_sections);
1024
1025         atomic_dec(&comp->in_flight);
1026         complete_journal_op(comp);
1027 }
1028
1029 static void encrypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
1030                             unsigned n_sections, struct journal_completion *comp)
1031 {
1032         if (ic->journal_xor)
1033                 return xor_journal(ic, encrypt, section, n_sections, comp);
1034         else
1035                 return crypt_journal(ic, encrypt, section, n_sections, comp);
1036 }
1037
1038 static void complete_journal_io(unsigned long error, void *context)
1039 {
1040         struct journal_completion *comp = context;
1041         if (unlikely(error != 0))
1042                 dm_integrity_io_error(comp->ic, "writing journal", -EIO);
1043         complete_journal_op(comp);
1044 }
1045
1046 static void rw_journal_sectors(struct dm_integrity_c *ic, int op, int op_flags,
1047                                unsigned sector, unsigned n_sectors, struct journal_completion *comp)
1048 {
1049         struct dm_io_request io_req;
1050         struct dm_io_region io_loc;
1051         unsigned pl_index, pl_offset;
1052         int r;
1053
1054         if (unlikely(dm_integrity_failed(ic))) {
1055                 if (comp)
1056                         complete_journal_io(-1UL, comp);
1057                 return;
1058         }
1059
1060         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
1061         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
1062
1063         io_req.bi_op = op;
1064         io_req.bi_op_flags = op_flags;
1065         io_req.mem.type = DM_IO_PAGE_LIST;
1066         if (ic->journal_io)
1067                 io_req.mem.ptr.pl = &ic->journal_io[pl_index];
1068         else
1069                 io_req.mem.ptr.pl = &ic->journal[pl_index];
1070         io_req.mem.offset = pl_offset;
1071         if (likely(comp != NULL)) {
1072                 io_req.notify.fn = complete_journal_io;
1073                 io_req.notify.context = comp;
1074         } else {
1075                 io_req.notify.fn = NULL;
1076         }
1077         io_req.client = ic->io;
1078         io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
1079         io_loc.sector = ic->start + SB_SECTORS + sector;
1080         io_loc.count = n_sectors;
1081
1082         r = dm_io(&io_req, 1, &io_loc, NULL);
1083         if (unlikely(r)) {
1084                 dm_integrity_io_error(ic, op == REQ_OP_READ ? "reading journal" : "writing journal", r);
1085                 if (comp) {
1086                         WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
1087                         complete_journal_io(-1UL, comp);
1088                 }
1089         }
1090 }
1091
1092 static void rw_journal(struct dm_integrity_c *ic, int op, int op_flags, unsigned section,
1093                        unsigned n_sections, struct journal_completion *comp)
1094 {
1095         unsigned sector, n_sectors;
1096
1097         sector = section * ic->journal_section_sectors;
1098         n_sectors = n_sections * ic->journal_section_sectors;
1099
1100         rw_journal_sectors(ic, op, op_flags, sector, n_sectors, comp);
1101 }
1102
1103 static void write_journal(struct dm_integrity_c *ic, unsigned commit_start, unsigned commit_sections)
1104 {
1105         struct journal_completion io_comp;
1106         struct journal_completion crypt_comp_1;
1107         struct journal_completion crypt_comp_2;
1108         unsigned i;
1109
1110         io_comp.ic = ic;
1111         init_completion(&io_comp.comp);
1112
1113         if (commit_start + commit_sections <= ic->journal_sections) {
1114                 io_comp.in_flight = (atomic_t)ATOMIC_INIT(1);
1115                 if (ic->journal_io) {
1116                         crypt_comp_1.ic = ic;
1117                         init_completion(&crypt_comp_1.comp);
1118                         crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1119                         encrypt_journal(ic, true, commit_start, commit_sections, &crypt_comp_1);
1120                         wait_for_completion_io(&crypt_comp_1.comp);
1121                 } else {
1122                         for (i = 0; i < commit_sections; i++)
1123                                 rw_section_mac(ic, commit_start + i, true);
1124                 }
1125                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, commit_start,
1126                            commit_sections, &io_comp);
1127         } else {
1128                 unsigned to_end;
1129                 io_comp.in_flight = (atomic_t)ATOMIC_INIT(2);
1130                 to_end = ic->journal_sections - commit_start;
1131                 if (ic->journal_io) {
1132                         crypt_comp_1.ic = ic;
1133                         init_completion(&crypt_comp_1.comp);
1134                         crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1135                         encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1);
1136                         if (try_wait_for_completion(&crypt_comp_1.comp)) {
1137                                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1138                                 reinit_completion(&crypt_comp_1.comp);
1139                                 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1140                                 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1);
1141                                 wait_for_completion_io(&crypt_comp_1.comp);
1142                         } else {
1143                                 crypt_comp_2.ic = ic;
1144                                 init_completion(&crypt_comp_2.comp);
1145                                 crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0);
1146                                 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2);
1147                                 wait_for_completion_io(&crypt_comp_1.comp);
1148                                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1149                                 wait_for_completion_io(&crypt_comp_2.comp);
1150                         }
1151                 } else {
1152                         for (i = 0; i < to_end; i++)
1153                                 rw_section_mac(ic, commit_start + i, true);
1154                         rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1155                         for (i = 0; i < commit_sections - to_end; i++)
1156                                 rw_section_mac(ic, i, true);
1157                 }
1158                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, 0, commit_sections - to_end, &io_comp);
1159         }
1160
1161         wait_for_completion_io(&io_comp.comp);
1162 }
1163
1164 static void copy_from_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset,
1165                               unsigned n_sectors, sector_t target, io_notify_fn fn, void *data)
1166 {
1167         struct dm_io_request io_req;
1168         struct dm_io_region io_loc;
1169         int r;
1170         unsigned sector, pl_index, pl_offset;
1171
1172         BUG_ON((target | n_sectors | offset) & (unsigned)(ic->sectors_per_block - 1));
1173
1174         if (unlikely(dm_integrity_failed(ic))) {
1175                 fn(-1UL, data);
1176                 return;
1177         }
1178
1179         sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset;
1180
1181         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
1182         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
1183
1184         io_req.bi_op = REQ_OP_WRITE;
1185         io_req.bi_op_flags = 0;
1186         io_req.mem.type = DM_IO_PAGE_LIST;
1187         io_req.mem.ptr.pl = &ic->journal[pl_index];
1188         io_req.mem.offset = pl_offset;
1189         io_req.notify.fn = fn;
1190         io_req.notify.context = data;
1191         io_req.client = ic->io;
1192         io_loc.bdev = ic->dev->bdev;
1193         io_loc.sector = target;
1194         io_loc.count = n_sectors;
1195
1196         r = dm_io(&io_req, 1, &io_loc, NULL);
1197         if (unlikely(r)) {
1198                 WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
1199                 fn(-1UL, data);
1200         }
1201 }
1202
1203 static bool ranges_overlap(struct dm_integrity_range *range1, struct dm_integrity_range *range2)
1204 {
1205         return range1->logical_sector < range2->logical_sector + range2->n_sectors &&
1206                range1->logical_sector + range1->n_sectors > range2->logical_sector;
1207 }
1208
1209 static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range, bool check_waiting)
1210 {
1211         struct rb_node **n = &ic->in_progress.rb_node;
1212         struct rb_node *parent;
1213
1214         BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned)(ic->sectors_per_block - 1));
1215
1216         if (likely(check_waiting)) {
1217                 struct dm_integrity_range *range;
1218                 list_for_each_entry(range, &ic->wait_list, wait_entry) {
1219                         if (unlikely(ranges_overlap(range, new_range)))
1220                                 return false;
1221                 }
1222         }
1223
1224         parent = NULL;
1225
1226         while (*n) {
1227                 struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node);
1228
1229                 parent = *n;
1230                 if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector) {
1231                         n = &range->node.rb_left;
1232                 } else if (new_range->logical_sector >= range->logical_sector + range->n_sectors) {
1233                         n = &range->node.rb_right;
1234                 } else {
1235                         return false;
1236                 }
1237         }
1238
1239         rb_link_node(&new_range->node, parent, n);
1240         rb_insert_color(&new_range->node, &ic->in_progress);
1241
1242         return true;
1243 }
1244
1245 static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1246 {
1247         rb_erase(&range->node, &ic->in_progress);
1248         while (unlikely(!list_empty(&ic->wait_list))) {
1249                 struct dm_integrity_range *last_range =
1250                         list_first_entry(&ic->wait_list, struct dm_integrity_range, wait_entry);
1251                 struct task_struct *last_range_task;
1252                 last_range_task = last_range->task;
1253                 list_del(&last_range->wait_entry);
1254                 if (!add_new_range(ic, last_range, false)) {
1255                         last_range->task = last_range_task;
1256                         list_add(&last_range->wait_entry, &ic->wait_list);
1257                         break;
1258                 }
1259                 last_range->waiting = false;
1260                 wake_up_process(last_range_task);
1261         }
1262 }
1263
1264 static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1265 {
1266         unsigned long flags;
1267
1268         spin_lock_irqsave(&ic->endio_wait.lock, flags);
1269         remove_range_unlocked(ic, range);
1270         spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1271 }
1272
1273 static void wait_and_add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1274 {
1275         new_range->waiting = true;
1276         list_add_tail(&new_range->wait_entry, &ic->wait_list);
1277         new_range->task = current;
1278         do {
1279                 __set_current_state(TASK_UNINTERRUPTIBLE);
1280                 spin_unlock_irq(&ic->endio_wait.lock);
1281                 io_schedule();
1282                 spin_lock_irq(&ic->endio_wait.lock);
1283         } while (unlikely(new_range->waiting));
1284 }
1285
1286 static void add_new_range_and_wait(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1287 {
1288         if (unlikely(!add_new_range(ic, new_range, true)))
1289                 wait_and_add_new_range(ic, new_range);
1290 }
1291
1292 static void init_journal_node(struct journal_node *node)
1293 {
1294         RB_CLEAR_NODE(&node->node);
1295         node->sector = (sector_t)-1;
1296 }
1297
1298 static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector)
1299 {
1300         struct rb_node **link;
1301         struct rb_node *parent;
1302
1303         node->sector = sector;
1304         BUG_ON(!RB_EMPTY_NODE(&node->node));
1305
1306         link = &ic->journal_tree_root.rb_node;
1307         parent = NULL;
1308
1309         while (*link) {
1310                 struct journal_node *j;
1311                 parent = *link;
1312                 j = container_of(parent, struct journal_node, node);
1313                 if (sector < j->sector)
1314                         link = &j->node.rb_left;
1315                 else
1316                         link = &j->node.rb_right;
1317         }
1318
1319         rb_link_node(&node->node, parent, link);
1320         rb_insert_color(&node->node, &ic->journal_tree_root);
1321 }
1322
1323 static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node)
1324 {
1325         BUG_ON(RB_EMPTY_NODE(&node->node));
1326         rb_erase(&node->node, &ic->journal_tree_root);
1327         init_journal_node(node);
1328 }
1329
1330 #define NOT_FOUND       (-1U)
1331
1332 static unsigned find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector)
1333 {
1334         struct rb_node *n = ic->journal_tree_root.rb_node;
1335         unsigned found = NOT_FOUND;
1336         *next_sector = (sector_t)-1;
1337         while (n) {
1338                 struct journal_node *j = container_of(n, struct journal_node, node);
1339                 if (sector == j->sector) {
1340                         found = j - ic->journal_tree;
1341                 }
1342                 if (sector < j->sector) {
1343                         *next_sector = j->sector;
1344                         n = j->node.rb_left;
1345                 } else {
1346                         n = j->node.rb_right;
1347                 }
1348         }
1349
1350         return found;
1351 }
1352
1353 static bool test_journal_node(struct dm_integrity_c *ic, unsigned pos, sector_t sector)
1354 {
1355         struct journal_node *node, *next_node;
1356         struct rb_node *next;
1357
1358         if (unlikely(pos >= ic->journal_entries))
1359                 return false;
1360         node = &ic->journal_tree[pos];
1361         if (unlikely(RB_EMPTY_NODE(&node->node)))
1362                 return false;
1363         if (unlikely(node->sector != sector))
1364                 return false;
1365
1366         next = rb_next(&node->node);
1367         if (unlikely(!next))
1368                 return true;
1369
1370         next_node = container_of(next, struct journal_node, node);
1371         return next_node->sector != sector;
1372 }
1373
1374 static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node)
1375 {
1376         struct rb_node *next;
1377         struct journal_node *next_node;
1378         unsigned next_section;
1379
1380         BUG_ON(RB_EMPTY_NODE(&node->node));
1381
1382         next = rb_next(&node->node);
1383         if (unlikely(!next))
1384                 return false;
1385
1386         next_node = container_of(next, struct journal_node, node);
1387
1388         if (next_node->sector != node->sector)
1389                 return false;
1390
1391         next_section = (unsigned)(next_node - ic->journal_tree) / ic->journal_section_entries;
1392         if (next_section >= ic->committed_section &&
1393             next_section < ic->committed_section + ic->n_committed_sections)
1394                 return true;
1395         if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections)
1396                 return true;
1397
1398         return false;
1399 }
1400
1401 #define TAG_READ        0
1402 #define TAG_WRITE       1
1403 #define TAG_CMP         2
1404
1405 static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block,
1406                                unsigned *metadata_offset, unsigned total_size, int op)
1407 {
1408 #define MAY_BE_FILLER           1
1409 #define MAY_BE_HASH             2
1410         unsigned hash_offset = 0;
1411         unsigned may_be = MAY_BE_HASH | (ic->discard ? MAY_BE_FILLER : 0);
1412
1413         do {
1414                 unsigned char *data, *dp;
1415                 struct dm_buffer *b;
1416                 unsigned to_copy;
1417                 int r;
1418
1419                 r = dm_integrity_failed(ic);
1420                 if (unlikely(r))
1421                         return r;
1422
1423                 data = dm_bufio_read(ic->bufio, *metadata_block, &b);
1424                 if (IS_ERR(data))
1425                         return PTR_ERR(data);
1426
1427                 to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size);
1428                 dp = data + *metadata_offset;
1429                 if (op == TAG_READ) {
1430                         memcpy(tag, dp, to_copy);
1431                 } else if (op == TAG_WRITE) {
1432                         if (memcmp(dp, tag, to_copy)) {
1433                                 memcpy(dp, tag, to_copy);
1434                                 dm_bufio_mark_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy);
1435                         }
1436                 } else {
1437                         /* e.g.: op == TAG_CMP */
1438
1439                         if (likely(is_power_of_2(ic->tag_size))) {
1440                                 if (unlikely(memcmp(dp, tag, to_copy)))
1441                                         if (unlikely(!ic->discard) ||
1442                                             unlikely(memchr_inv(dp, DISCARD_FILLER, to_copy) != NULL)) {
1443                                                 goto thorough_test;
1444                                 }
1445                         } else {
1446                                 unsigned i, ts;
1447 thorough_test:
1448                                 ts = total_size;
1449
1450                                 for (i = 0; i < to_copy; i++, ts--) {
1451                                         if (unlikely(dp[i] != tag[i]))
1452                                                 may_be &= ~MAY_BE_HASH;
1453                                         if (likely(dp[i] != DISCARD_FILLER))
1454                                                 may_be &= ~MAY_BE_FILLER;
1455                                         hash_offset++;
1456                                         if (unlikely(hash_offset == ic->tag_size)) {
1457                                                 if (unlikely(!may_be)) {
1458                                                         dm_bufio_release(b);
1459                                                         return ts;
1460                                                 }
1461                                                 hash_offset = 0;
1462                                                 may_be = MAY_BE_HASH | (ic->discard ? MAY_BE_FILLER : 0);
1463                                         }
1464                                 }
1465                         }
1466                 }
1467                 dm_bufio_release(b);
1468
1469                 tag += to_copy;
1470                 *metadata_offset += to_copy;
1471                 if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) {
1472                         (*metadata_block)++;
1473                         *metadata_offset = 0;
1474                 }
1475
1476                 if (unlikely(!is_power_of_2(ic->tag_size))) {
1477                         hash_offset = (hash_offset + to_copy) % ic->tag_size;
1478                 }
1479
1480                 total_size -= to_copy;
1481         } while (unlikely(total_size));
1482
1483         return 0;
1484 #undef MAY_BE_FILLER
1485 #undef MAY_BE_HASH
1486 }
1487
1488 struct flush_request {
1489         struct dm_io_request io_req;
1490         struct dm_io_region io_reg;
1491         struct dm_integrity_c *ic;
1492         struct completion comp;
1493 };
1494
1495 static void flush_notify(unsigned long error, void *fr_)
1496 {
1497         struct flush_request *fr = fr_;
1498         if (unlikely(error != 0))
1499                 dm_integrity_io_error(fr->ic, "flushing disk cache", -EIO);
1500         complete(&fr->comp);
1501 }
1502
1503 static void dm_integrity_flush_buffers(struct dm_integrity_c *ic, bool flush_data)
1504 {
1505         int r;
1506
1507         struct flush_request fr;
1508
1509         if (!ic->meta_dev)
1510                 flush_data = false;
1511         if (flush_data) {
1512                 fr.io_req.bi_op = REQ_OP_WRITE,
1513                 fr.io_req.bi_op_flags = REQ_PREFLUSH | REQ_SYNC,
1514                 fr.io_req.mem.type = DM_IO_KMEM,
1515                 fr.io_req.mem.ptr.addr = NULL,
1516                 fr.io_req.notify.fn = flush_notify,
1517                 fr.io_req.notify.context = &fr;
1518                 fr.io_req.client = dm_bufio_get_dm_io_client(ic->bufio),
1519                 fr.io_reg.bdev = ic->dev->bdev,
1520                 fr.io_reg.sector = 0,
1521                 fr.io_reg.count = 0,
1522                 fr.ic = ic;
1523                 init_completion(&fr.comp);
1524                 r = dm_io(&fr.io_req, 1, &fr.io_reg, NULL);
1525                 BUG_ON(r);
1526         }
1527
1528         r = dm_bufio_write_dirty_buffers(ic->bufio);
1529         if (unlikely(r))
1530                 dm_integrity_io_error(ic, "writing tags", r);
1531
1532         if (flush_data)
1533                 wait_for_completion(&fr.comp);
1534 }
1535
1536 static void sleep_on_endio_wait(struct dm_integrity_c *ic)
1537 {
1538         DECLARE_WAITQUEUE(wait, current);
1539         __add_wait_queue(&ic->endio_wait, &wait);
1540         __set_current_state(TASK_UNINTERRUPTIBLE);
1541         spin_unlock_irq(&ic->endio_wait.lock);
1542         io_schedule();
1543         spin_lock_irq(&ic->endio_wait.lock);
1544         __remove_wait_queue(&ic->endio_wait, &wait);
1545 }
1546
1547 static void autocommit_fn(struct timer_list *t)
1548 {
1549         struct dm_integrity_c *ic = from_timer(ic, t, autocommit_timer);
1550
1551         if (likely(!dm_integrity_failed(ic)))
1552                 queue_work(ic->commit_wq, &ic->commit_work);
1553 }
1554
1555 static void schedule_autocommit(struct dm_integrity_c *ic)
1556 {
1557         if (!timer_pending(&ic->autocommit_timer))
1558                 mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies);
1559 }
1560
1561 static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1562 {
1563         struct bio *bio;
1564         unsigned long flags;
1565
1566         spin_lock_irqsave(&ic->endio_wait.lock, flags);
1567         bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1568         bio_list_add(&ic->flush_bio_list, bio);
1569         spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1570
1571         queue_work(ic->commit_wq, &ic->commit_work);
1572 }
1573
1574 static void do_endio(struct dm_integrity_c *ic, struct bio *bio)
1575 {
1576         int r = dm_integrity_failed(ic);
1577         if (unlikely(r) && !bio->bi_status)
1578                 bio->bi_status = errno_to_blk_status(r);
1579         if (unlikely(ic->synchronous_mode) && bio_op(bio) == REQ_OP_WRITE) {
1580                 unsigned long flags;
1581                 spin_lock_irqsave(&ic->endio_wait.lock, flags);
1582                 bio_list_add(&ic->synchronous_bios, bio);
1583                 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
1584                 spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1585                 return;
1586         }
1587         bio_endio(bio);
1588 }
1589
1590 static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1591 {
1592         struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1593
1594         if (unlikely(dio->fua) && likely(!bio->bi_status) && likely(!dm_integrity_failed(ic)))
1595                 submit_flush_bio(ic, dio);
1596         else
1597                 do_endio(ic, bio);
1598 }
1599
1600 static void dec_in_flight(struct dm_integrity_io *dio)
1601 {
1602         if (atomic_dec_and_test(&dio->in_flight)) {
1603                 struct dm_integrity_c *ic = dio->ic;
1604                 struct bio *bio;
1605
1606                 remove_range(ic, &dio->range);
1607
1608                 if (dio->op == REQ_OP_WRITE || unlikely(dio->op == REQ_OP_DISCARD))
1609                         schedule_autocommit(ic);
1610
1611                 bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1612
1613                 if (unlikely(dio->bi_status) && !bio->bi_status)
1614                         bio->bi_status = dio->bi_status;
1615                 if (likely(!bio->bi_status) && unlikely(bio_sectors(bio) != dio->range.n_sectors)) {
1616                         dio->range.logical_sector += dio->range.n_sectors;
1617                         bio_advance(bio, dio->range.n_sectors << SECTOR_SHIFT);
1618                         INIT_WORK(&dio->work, integrity_bio_wait);
1619                         queue_work(ic->offload_wq, &dio->work);
1620                         return;
1621                 }
1622                 do_endio_flush(ic, dio);
1623         }
1624 }
1625
1626 static void integrity_end_io(struct bio *bio)
1627 {
1628         struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1629
1630         dm_bio_restore(&dio->bio_details, bio);
1631         if (bio->bi_integrity)
1632                 bio->bi_opf |= REQ_INTEGRITY;
1633
1634         if (dio->completion)
1635                 complete(dio->completion);
1636
1637         dec_in_flight(dio);
1638 }
1639
1640 static void integrity_sector_checksum(struct dm_integrity_c *ic, sector_t sector,
1641                                       const char *data, char *result)
1642 {
1643         __le64 sector_le = cpu_to_le64(sector);
1644         SHASH_DESC_ON_STACK(req, ic->internal_hash);
1645         int r;
1646         unsigned digest_size;
1647
1648         req->tfm = ic->internal_hash;
1649
1650         r = crypto_shash_init(req);
1651         if (unlikely(r < 0)) {
1652                 dm_integrity_io_error(ic, "crypto_shash_init", r);
1653                 goto failed;
1654         }
1655
1656         if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
1657                 r = crypto_shash_update(req, (__u8 *)&ic->sb->salt, SALT_SIZE);
1658                 if (unlikely(r < 0)) {
1659                         dm_integrity_io_error(ic, "crypto_shash_update", r);
1660                         goto failed;
1661                 }
1662         }
1663
1664         r = crypto_shash_update(req, (const __u8 *)&sector_le, sizeof sector_le);
1665         if (unlikely(r < 0)) {
1666                 dm_integrity_io_error(ic, "crypto_shash_update", r);
1667                 goto failed;
1668         }
1669
1670         r = crypto_shash_update(req, data, ic->sectors_per_block << SECTOR_SHIFT);
1671         if (unlikely(r < 0)) {
1672                 dm_integrity_io_error(ic, "crypto_shash_update", r);
1673                 goto failed;
1674         }
1675
1676         r = crypto_shash_final(req, result);
1677         if (unlikely(r < 0)) {
1678                 dm_integrity_io_error(ic, "crypto_shash_final", r);
1679                 goto failed;
1680         }
1681
1682         digest_size = crypto_shash_digestsize(ic->internal_hash);
1683         if (unlikely(digest_size < ic->tag_size))
1684                 memset(result + digest_size, 0, ic->tag_size - digest_size);
1685
1686         return;
1687
1688 failed:
1689         /* this shouldn't happen anyway, the hash functions have no reason to fail */
1690         get_random_bytes(result, ic->tag_size);
1691 }
1692
1693 static void integrity_metadata(struct work_struct *w)
1694 {
1695         struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
1696         struct dm_integrity_c *ic = dio->ic;
1697
1698         int r;
1699
1700         if (ic->internal_hash) {
1701                 struct bvec_iter iter;
1702                 struct bio_vec bv;
1703                 unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1704                 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1705                 char *checksums;
1706                 unsigned extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0;
1707                 char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
1708                 sector_t sector;
1709                 unsigned sectors_to_process;
1710
1711                 if (unlikely(ic->mode == 'R'))
1712                         goto skip_io;
1713
1714                 if (likely(dio->op != REQ_OP_DISCARD))
1715                         checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT >> ic->sb->log2_sectors_per_block) * ic->tag_size + extra_space,
1716                                             GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
1717                 else
1718                         checksums = kmalloc(PAGE_SIZE, GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
1719                 if (!checksums) {
1720                         checksums = checksums_onstack;
1721                         if (WARN_ON(extra_space &&
1722                                     digest_size > sizeof(checksums_onstack))) {
1723                                 r = -EINVAL;
1724                                 goto error;
1725                         }
1726                 }
1727
1728                 if (unlikely(dio->op == REQ_OP_DISCARD)) {
1729                         sector_t bi_sector = dio->bio_details.bi_iter.bi_sector;
1730                         unsigned bi_size = dio->bio_details.bi_iter.bi_size;
1731                         unsigned max_size = likely(checksums != checksums_onstack) ? PAGE_SIZE : HASH_MAX_DIGESTSIZE;
1732                         unsigned max_blocks = max_size / ic->tag_size;
1733                         memset(checksums, DISCARD_FILLER, max_size);
1734
1735                         while (bi_size) {
1736                                 unsigned this_step_blocks = bi_size >> (SECTOR_SHIFT + ic->sb->log2_sectors_per_block);
1737                                 this_step_blocks = min(this_step_blocks, max_blocks);
1738                                 r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1739                                                         this_step_blocks * ic->tag_size, TAG_WRITE);
1740                                 if (unlikely(r)) {
1741                                         if (likely(checksums != checksums_onstack))
1742                                                 kfree(checksums);
1743                                         goto error;
1744                                 }
1745
1746                                 /*if (bi_size < this_step_blocks << (SECTOR_SHIFT + ic->sb->log2_sectors_per_block)) {
1747                                         printk("BUGG: bi_sector: %llx, bi_size: %u\n", bi_sector, bi_size);
1748                                         printk("BUGG: this_step_blocks: %u\n", this_step_blocks);
1749                                         BUG();
1750                                 }*/
1751                                 bi_size -= this_step_blocks << (SECTOR_SHIFT + ic->sb->log2_sectors_per_block);
1752                                 bi_sector += this_step_blocks << ic->sb->log2_sectors_per_block;
1753                         }
1754
1755                         if (likely(checksums != checksums_onstack))
1756                                 kfree(checksums);
1757                         goto skip_io;
1758                 }
1759
1760                 sector = dio->range.logical_sector;
1761                 sectors_to_process = dio->range.n_sectors;
1762
1763                 __bio_for_each_segment(bv, bio, iter, dio->bio_details.bi_iter) {
1764                         unsigned pos;
1765                         char *mem, *checksums_ptr;
1766
1767 again:
1768                         mem = (char *)kmap_atomic(bv.bv_page) + bv.bv_offset;
1769                         pos = 0;
1770                         checksums_ptr = checksums;
1771                         do {
1772                                 integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr);
1773                                 checksums_ptr += ic->tag_size;
1774                                 sectors_to_process -= ic->sectors_per_block;
1775                                 pos += ic->sectors_per_block << SECTOR_SHIFT;
1776                                 sector += ic->sectors_per_block;
1777                         } while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
1778                         kunmap_atomic(mem);
1779
1780                         r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1781                                                 checksums_ptr - checksums, dio->op == REQ_OP_READ ? TAG_CMP : TAG_WRITE);
1782                         if (unlikely(r)) {
1783                                 if (r > 0) {
1784                                         char b[BDEVNAME_SIZE];
1785                                         DMERR_LIMIT("%s: Checksum failed at sector 0x%llx", bio_devname(bio, b),
1786                                                     (sector - ((r + ic->tag_size - 1) / ic->tag_size)));
1787                                         r = -EILSEQ;
1788                                         atomic64_inc(&ic->number_of_mismatches);
1789                                 }
1790                                 if (likely(checksums != checksums_onstack))
1791                                         kfree(checksums);
1792                                 goto error;
1793                         }
1794
1795                         if (!sectors_to_process)
1796                                 break;
1797
1798                         if (unlikely(pos < bv.bv_len)) {
1799                                 bv.bv_offset += pos;
1800                                 bv.bv_len -= pos;
1801                                 goto again;
1802                         }
1803                 }
1804
1805                 if (likely(checksums != checksums_onstack))
1806                         kfree(checksums);
1807         } else {
1808                 struct bio_integrity_payload *bip = dio->bio_details.bi_integrity;
1809
1810                 if (bip) {
1811                         struct bio_vec biv;
1812                         struct bvec_iter iter;
1813                         unsigned data_to_process = dio->range.n_sectors;
1814                         sector_to_block(ic, data_to_process);
1815                         data_to_process *= ic->tag_size;
1816
1817                         bip_for_each_vec(biv, bip, iter) {
1818                                 unsigned char *tag;
1819                                 unsigned this_len;
1820
1821                                 BUG_ON(PageHighMem(biv.bv_page));
1822                                 tag = bvec_virt(&biv);
1823                                 this_len = min(biv.bv_len, data_to_process);
1824                                 r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset,
1825                                                         this_len, dio->op == REQ_OP_READ ? TAG_READ : TAG_WRITE);
1826                                 if (unlikely(r))
1827                                         goto error;
1828                                 data_to_process -= this_len;
1829                                 if (!data_to_process)
1830                                         break;
1831                         }
1832                 }
1833         }
1834 skip_io:
1835         dec_in_flight(dio);
1836         return;
1837 error:
1838         dio->bi_status = errno_to_blk_status(r);
1839         dec_in_flight(dio);
1840 }
1841
1842 static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
1843 {
1844         struct dm_integrity_c *ic = ti->private;
1845         struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1846         struct bio_integrity_payload *bip;
1847
1848         sector_t area, offset;
1849
1850         dio->ic = ic;
1851         dio->bi_status = 0;
1852         dio->op = bio_op(bio);
1853
1854         if (unlikely(dio->op == REQ_OP_DISCARD)) {
1855                 if (ti->max_io_len) {
1856                         sector_t sec = dm_target_offset(ti, bio->bi_iter.bi_sector);
1857                         unsigned log2_max_io_len = __fls(ti->max_io_len);
1858                         sector_t start_boundary = sec >> log2_max_io_len;
1859                         sector_t end_boundary = (sec + bio_sectors(bio) - 1) >> log2_max_io_len;
1860                         if (start_boundary < end_boundary) {
1861                                 sector_t len = ti->max_io_len - (sec & (ti->max_io_len - 1));
1862                                 dm_accept_partial_bio(bio, len);
1863                         }
1864                 }
1865         }
1866
1867         if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
1868                 submit_flush_bio(ic, dio);
1869                 return DM_MAPIO_SUBMITTED;
1870         }
1871
1872         dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector);
1873         dio->fua = dio->op == REQ_OP_WRITE && bio->bi_opf & REQ_FUA;
1874         if (unlikely(dio->fua)) {
1875                 /*
1876                  * Don't pass down the FUA flag because we have to flush
1877                  * disk cache anyway.
1878                  */
1879                 bio->bi_opf &= ~REQ_FUA;
1880         }
1881         if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) {
1882                 DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx",
1883                       dio->range.logical_sector, bio_sectors(bio),
1884                       ic->provided_data_sectors);
1885                 return DM_MAPIO_KILL;
1886         }
1887         if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned)(ic->sectors_per_block - 1))) {
1888                 DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x",
1889                       ic->sectors_per_block,
1890                       dio->range.logical_sector, bio_sectors(bio));
1891                 return DM_MAPIO_KILL;
1892         }
1893
1894         if (ic->sectors_per_block > 1 && likely(dio->op != REQ_OP_DISCARD)) {
1895                 struct bvec_iter iter;
1896                 struct bio_vec bv;
1897                 bio_for_each_segment(bv, bio, iter) {
1898                         if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
1899                                 DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
1900                                         bv.bv_offset, bv.bv_len, ic->sectors_per_block);
1901                                 return DM_MAPIO_KILL;
1902                         }
1903                 }
1904         }
1905
1906         bip = bio_integrity(bio);
1907         if (!ic->internal_hash) {
1908                 if (bip) {
1909                         unsigned wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block;
1910                         if (ic->log2_tag_size >= 0)
1911                                 wanted_tag_size <<= ic->log2_tag_size;
1912                         else
1913                                 wanted_tag_size *= ic->tag_size;
1914                         if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) {
1915                                 DMERR("Invalid integrity data size %u, expected %u",
1916                                       bip->bip_iter.bi_size, wanted_tag_size);
1917                                 return DM_MAPIO_KILL;
1918                         }
1919                 }
1920         } else {
1921                 if (unlikely(bip != NULL)) {
1922                         DMERR("Unexpected integrity data when using internal hash");
1923                         return DM_MAPIO_KILL;
1924                 }
1925         }
1926
1927         if (unlikely(ic->mode == 'R') && unlikely(dio->op != REQ_OP_READ))
1928                 return DM_MAPIO_KILL;
1929
1930         get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1931         dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1932         bio->bi_iter.bi_sector = get_data_sector(ic, area, offset);
1933
1934         dm_integrity_map_continue(dio, true);
1935         return DM_MAPIO_SUBMITTED;
1936 }
1937
1938 static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
1939                                  unsigned journal_section, unsigned journal_entry)
1940 {
1941         struct dm_integrity_c *ic = dio->ic;
1942         sector_t logical_sector;
1943         unsigned n_sectors;
1944
1945         logical_sector = dio->range.logical_sector;
1946         n_sectors = dio->range.n_sectors;
1947         do {
1948                 struct bio_vec bv = bio_iovec(bio);
1949                 char *mem;
1950
1951                 if (unlikely(bv.bv_len >> SECTOR_SHIFT > n_sectors))
1952                         bv.bv_len = n_sectors << SECTOR_SHIFT;
1953                 n_sectors -= bv.bv_len >> SECTOR_SHIFT;
1954                 bio_advance_iter(bio, &bio->bi_iter, bv.bv_len);
1955 retry_kmap:
1956                 mem = kmap_atomic(bv.bv_page);
1957                 if (likely(dio->op == REQ_OP_WRITE))
1958                         flush_dcache_page(bv.bv_page);
1959
1960                 do {
1961                         struct journal_entry *je = access_journal_entry(ic, journal_section, journal_entry);
1962
1963                         if (unlikely(dio->op == REQ_OP_READ)) {
1964                                 struct journal_sector *js;
1965                                 char *mem_ptr;
1966                                 unsigned s;
1967
1968                                 if (unlikely(journal_entry_is_inprogress(je))) {
1969                                         flush_dcache_page(bv.bv_page);
1970                                         kunmap_atomic(mem);
1971
1972                                         __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
1973                                         goto retry_kmap;
1974                                 }
1975                                 smp_rmb();
1976                                 BUG_ON(journal_entry_get_sector(je) != logical_sector);
1977                                 js = access_journal_data(ic, journal_section, journal_entry);
1978                                 mem_ptr = mem + bv.bv_offset;
1979                                 s = 0;
1980                                 do {
1981                                         memcpy(mem_ptr, js, JOURNAL_SECTOR_DATA);
1982                                         *(commit_id_t *)(mem_ptr + JOURNAL_SECTOR_DATA) = je->last_bytes[s];
1983                                         js++;
1984                                         mem_ptr += 1 << SECTOR_SHIFT;
1985                                 } while (++s < ic->sectors_per_block);
1986 #ifdef INTERNAL_VERIFY
1987                                 if (ic->internal_hash) {
1988                                         char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
1989
1990                                         integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack);
1991                                         if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) {
1992                                                 DMERR_LIMIT("Checksum failed when reading from journal, at sector 0x%llx",
1993                                                             logical_sector);
1994                                         }
1995                                 }
1996 #endif
1997                         }
1998
1999                         if (!ic->internal_hash) {
2000                                 struct bio_integrity_payload *bip = bio_integrity(bio);
2001                                 unsigned tag_todo = ic->tag_size;
2002                                 char *tag_ptr = journal_entry_tag(ic, je);
2003
2004                                 if (bip) do {
2005                                         struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
2006                                         unsigned tag_now = min(biv.bv_len, tag_todo);
2007                                         char *tag_addr;
2008                                         BUG_ON(PageHighMem(biv.bv_page));
2009                                         tag_addr = bvec_virt(&biv);
2010                                         if (likely(dio->op == REQ_OP_WRITE))
2011                                                 memcpy(tag_ptr, tag_addr, tag_now);
2012                                         else
2013                                                 memcpy(tag_addr, tag_ptr, tag_now);
2014                                         bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now);
2015                                         tag_ptr += tag_now;
2016                                         tag_todo -= tag_now;
2017                                 } while (unlikely(tag_todo)); else {
2018                                         if (likely(dio->op == REQ_OP_WRITE))
2019                                                 memset(tag_ptr, 0, tag_todo);
2020                                 }
2021                         }
2022
2023                         if (likely(dio->op == REQ_OP_WRITE)) {
2024                                 struct journal_sector *js;
2025                                 unsigned s;
2026
2027                                 js = access_journal_data(ic, journal_section, journal_entry);
2028                                 memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT);
2029
2030                                 s = 0;
2031                                 do {
2032                                         je->last_bytes[s] = js[s].commit_id;
2033                                 } while (++s < ic->sectors_per_block);
2034
2035                                 if (ic->internal_hash) {
2036                                         unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
2037                                         if (unlikely(digest_size > ic->tag_size)) {
2038                                                 char checksums_onstack[HASH_MAX_DIGESTSIZE];
2039                                                 integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack);
2040                                                 memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size);
2041                                         } else
2042                                                 integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je));
2043                                 }
2044
2045                                 journal_entry_set_sector(je, logical_sector);
2046                         }
2047                         logical_sector += ic->sectors_per_block;
2048
2049                         journal_entry++;
2050                         if (unlikely(journal_entry == ic->journal_section_entries)) {
2051                                 journal_entry = 0;
2052                                 journal_section++;
2053                                 wraparound_section(ic, &journal_section);
2054                         }
2055
2056                         bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT;
2057                 } while (bv.bv_len -= ic->sectors_per_block << SECTOR_SHIFT);
2058
2059                 if (unlikely(dio->op == REQ_OP_READ))
2060                         flush_dcache_page(bv.bv_page);
2061                 kunmap_atomic(mem);
2062         } while (n_sectors);
2063
2064         if (likely(dio->op == REQ_OP_WRITE)) {
2065                 smp_mb();
2066                 if (unlikely(waitqueue_active(&ic->copy_to_journal_wait)))
2067                         wake_up(&ic->copy_to_journal_wait);
2068                 if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) {
2069                         queue_work(ic->commit_wq, &ic->commit_work);
2070                 } else {
2071                         schedule_autocommit(ic);
2072                 }
2073         } else {
2074                 remove_range(ic, &dio->range);
2075         }
2076
2077         if (unlikely(bio->bi_iter.bi_size)) {
2078                 sector_t area, offset;
2079
2080                 dio->range.logical_sector = logical_sector;
2081                 get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
2082                 dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
2083                 return true;
2084         }
2085
2086         return false;
2087 }
2088
2089 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map)
2090 {
2091         struct dm_integrity_c *ic = dio->ic;
2092         struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
2093         unsigned journal_section, journal_entry;
2094         unsigned journal_read_pos;
2095         struct completion read_comp;
2096         bool discard_retried = false;
2097         bool need_sync_io = ic->internal_hash && dio->op == REQ_OP_READ;
2098         if (unlikely(dio->op == REQ_OP_DISCARD) && ic->mode != 'D')
2099                 need_sync_io = true;
2100
2101         if (need_sync_io && from_map) {
2102                 INIT_WORK(&dio->work, integrity_bio_wait);
2103                 queue_work(ic->offload_wq, &dio->work);
2104                 return;
2105         }
2106
2107 lock_retry:
2108         spin_lock_irq(&ic->endio_wait.lock);
2109 retry:
2110         if (unlikely(dm_integrity_failed(ic))) {
2111                 spin_unlock_irq(&ic->endio_wait.lock);
2112                 do_endio(ic, bio);
2113                 return;
2114         }
2115         dio->range.n_sectors = bio_sectors(bio);
2116         journal_read_pos = NOT_FOUND;
2117         if (ic->mode == 'J' && likely(dio->op != REQ_OP_DISCARD)) {
2118                 if (dio->op == REQ_OP_WRITE) {
2119                         unsigned next_entry, i, pos;
2120                         unsigned ws, we, range_sectors;
2121
2122                         dio->range.n_sectors = min(dio->range.n_sectors,
2123                                                    (sector_t)ic->free_sectors << ic->sb->log2_sectors_per_block);
2124                         if (unlikely(!dio->range.n_sectors)) {
2125                                 if (from_map)
2126                                         goto offload_to_thread;
2127                                 sleep_on_endio_wait(ic);
2128                                 goto retry;
2129                         }
2130                         range_sectors = dio->range.n_sectors >> ic->sb->log2_sectors_per_block;
2131                         ic->free_sectors -= range_sectors;
2132                         journal_section = ic->free_section;
2133                         journal_entry = ic->free_section_entry;
2134
2135                         next_entry = ic->free_section_entry + range_sectors;
2136                         ic->free_section_entry = next_entry % ic->journal_section_entries;
2137                         ic->free_section += next_entry / ic->journal_section_entries;
2138                         ic->n_uncommitted_sections += next_entry / ic->journal_section_entries;
2139                         wraparound_section(ic, &ic->free_section);
2140
2141                         pos = journal_section * ic->journal_section_entries + journal_entry;
2142                         ws = journal_section;
2143                         we = journal_entry;
2144                         i = 0;
2145                         do {
2146                                 struct journal_entry *je;
2147
2148                                 add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i);
2149                                 pos++;
2150                                 if (unlikely(pos >= ic->journal_entries))
2151                                         pos = 0;
2152
2153                                 je = access_journal_entry(ic, ws, we);
2154                                 BUG_ON(!journal_entry_is_unused(je));
2155                                 journal_entry_set_inprogress(je);
2156                                 we++;
2157                                 if (unlikely(we == ic->journal_section_entries)) {
2158                                         we = 0;
2159                                         ws++;
2160                                         wraparound_section(ic, &ws);
2161                                 }
2162                         } while ((i += ic->sectors_per_block) < dio->range.n_sectors);
2163
2164                         spin_unlock_irq(&ic->endio_wait.lock);
2165                         goto journal_read_write;
2166                 } else {
2167                         sector_t next_sector;
2168                         journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2169                         if (likely(journal_read_pos == NOT_FOUND)) {
2170                                 if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector))
2171                                         dio->range.n_sectors = next_sector - dio->range.logical_sector;
2172                         } else {
2173                                 unsigned i;
2174                                 unsigned jp = journal_read_pos + 1;
2175                                 for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) {
2176                                         if (!test_journal_node(ic, jp, dio->range.logical_sector + i))
2177                                                 break;
2178                                 }
2179                                 dio->range.n_sectors = i;
2180                         }
2181                 }
2182         }
2183         if (unlikely(!add_new_range(ic, &dio->range, true))) {
2184                 /*
2185                  * We must not sleep in the request routine because it could
2186                  * stall bios on current->bio_list.
2187                  * So, we offload the bio to a workqueue if we have to sleep.
2188                  */
2189                 if (from_map) {
2190 offload_to_thread:
2191                         spin_unlock_irq(&ic->endio_wait.lock);
2192                         INIT_WORK(&dio->work, integrity_bio_wait);
2193                         queue_work(ic->wait_wq, &dio->work);
2194                         return;
2195                 }
2196                 if (journal_read_pos != NOT_FOUND)
2197                         dio->range.n_sectors = ic->sectors_per_block;
2198                 wait_and_add_new_range(ic, &dio->range);
2199                 /*
2200                  * wait_and_add_new_range drops the spinlock, so the journal
2201                  * may have been changed arbitrarily. We need to recheck.
2202                  * To simplify the code, we restrict I/O size to just one block.
2203                  */
2204                 if (journal_read_pos != NOT_FOUND) {
2205                         sector_t next_sector;
2206                         unsigned new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2207                         if (unlikely(new_pos != journal_read_pos)) {
2208                                 remove_range_unlocked(ic, &dio->range);
2209                                 goto retry;
2210                         }
2211                 }
2212         }
2213         if (ic->mode == 'J' && likely(dio->op == REQ_OP_DISCARD) && !discard_retried) {
2214                 sector_t next_sector;
2215                 unsigned new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2216                 if (unlikely(new_pos != NOT_FOUND) ||
2217                     unlikely(next_sector < dio->range.logical_sector - dio->range.n_sectors)) {
2218                         remove_range_unlocked(ic, &dio->range);
2219                         spin_unlock_irq(&ic->endio_wait.lock);
2220                         queue_work(ic->commit_wq, &ic->commit_work);
2221                         flush_workqueue(ic->commit_wq);
2222                         queue_work(ic->writer_wq, &ic->writer_work);
2223                         flush_workqueue(ic->writer_wq);
2224                         discard_retried = true;
2225                         goto lock_retry;
2226                 }
2227         }
2228         spin_unlock_irq(&ic->endio_wait.lock);
2229
2230         if (unlikely(journal_read_pos != NOT_FOUND)) {
2231                 journal_section = journal_read_pos / ic->journal_section_entries;
2232                 journal_entry = journal_read_pos % ic->journal_section_entries;
2233                 goto journal_read_write;
2234         }
2235
2236         if (ic->mode == 'B' && (dio->op == REQ_OP_WRITE || unlikely(dio->op == REQ_OP_DISCARD))) {
2237                 if (!block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2238                                      dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
2239                         struct bitmap_block_status *bbs;
2240
2241                         bbs = sector_to_bitmap_block(ic, dio->range.logical_sector);
2242                         spin_lock(&bbs->bio_queue_lock);
2243                         bio_list_add(&bbs->bio_queue, bio);
2244                         spin_unlock(&bbs->bio_queue_lock);
2245                         queue_work(ic->writer_wq, &bbs->work);
2246                         return;
2247                 }
2248         }
2249
2250         dio->in_flight = (atomic_t)ATOMIC_INIT(2);
2251
2252         if (need_sync_io) {
2253                 init_completion(&read_comp);
2254                 dio->completion = &read_comp;
2255         } else
2256                 dio->completion = NULL;
2257
2258         dm_bio_record(&dio->bio_details, bio);
2259         bio_set_dev(bio, ic->dev->bdev);
2260         bio->bi_integrity = NULL;
2261         bio->bi_opf &= ~REQ_INTEGRITY;
2262         bio->bi_end_io = integrity_end_io;
2263         bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT;
2264
2265         if (unlikely(dio->op == REQ_OP_DISCARD) && likely(ic->mode != 'D')) {
2266                 integrity_metadata(&dio->work);
2267                 dm_integrity_flush_buffers(ic, false);
2268
2269                 dio->in_flight = (atomic_t)ATOMIC_INIT(1);
2270                 dio->completion = NULL;
2271
2272                 submit_bio_noacct(bio);
2273
2274                 return;
2275         }
2276
2277         submit_bio_noacct(bio);
2278
2279         if (need_sync_io) {
2280                 wait_for_completion_io(&read_comp);
2281                 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
2282                     dio->range.logical_sector + dio->range.n_sectors > le64_to_cpu(ic->sb->recalc_sector))
2283                         goto skip_check;
2284                 if (ic->mode == 'B') {
2285                         if (!block_bitmap_op(ic, ic->recalc_bitmap, dio->range.logical_sector,
2286                                              dio->range.n_sectors, BITMAP_OP_TEST_ALL_CLEAR))
2287                                 goto skip_check;
2288                 }
2289
2290                 if (likely(!bio->bi_status))
2291                         integrity_metadata(&dio->work);
2292                 else
2293 skip_check:
2294                         dec_in_flight(dio);
2295
2296         } else {
2297                 INIT_WORK(&dio->work, integrity_metadata);
2298                 queue_work(ic->metadata_wq, &dio->work);
2299         }
2300
2301         return;
2302
2303 journal_read_write:
2304         if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry)))
2305                 goto lock_retry;
2306
2307         do_endio_flush(ic, dio);
2308 }
2309
2310
2311 static void integrity_bio_wait(struct work_struct *w)
2312 {
2313         struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
2314
2315         dm_integrity_map_continue(dio, false);
2316 }
2317
2318 static void pad_uncommitted(struct dm_integrity_c *ic)
2319 {
2320         if (ic->free_section_entry) {
2321                 ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry;
2322                 ic->free_section_entry = 0;
2323                 ic->free_section++;
2324                 wraparound_section(ic, &ic->free_section);
2325                 ic->n_uncommitted_sections++;
2326         }
2327         if (WARN_ON(ic->journal_sections * ic->journal_section_entries !=
2328                     (ic->n_uncommitted_sections + ic->n_committed_sections) *
2329                     ic->journal_section_entries + ic->free_sectors)) {
2330                 DMCRIT("journal_sections %u, journal_section_entries %u, "
2331                        "n_uncommitted_sections %u, n_committed_sections %u, "
2332                        "journal_section_entries %u, free_sectors %u",
2333                        ic->journal_sections, ic->journal_section_entries,
2334                        ic->n_uncommitted_sections, ic->n_committed_sections,
2335                        ic->journal_section_entries, ic->free_sectors);
2336         }
2337 }
2338
2339 static void integrity_commit(struct work_struct *w)
2340 {
2341         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work);
2342         unsigned commit_start, commit_sections;
2343         unsigned i, j, n;
2344         struct bio *flushes;
2345
2346         del_timer(&ic->autocommit_timer);
2347
2348         spin_lock_irq(&ic->endio_wait.lock);
2349         flushes = bio_list_get(&ic->flush_bio_list);
2350         if (unlikely(ic->mode != 'J')) {
2351                 spin_unlock_irq(&ic->endio_wait.lock);
2352                 dm_integrity_flush_buffers(ic, true);
2353                 goto release_flush_bios;
2354         }
2355
2356         pad_uncommitted(ic);
2357         commit_start = ic->uncommitted_section;
2358         commit_sections = ic->n_uncommitted_sections;
2359         spin_unlock_irq(&ic->endio_wait.lock);
2360
2361         if (!commit_sections)
2362                 goto release_flush_bios;
2363
2364         i = commit_start;
2365         for (n = 0; n < commit_sections; n++) {
2366                 for (j = 0; j < ic->journal_section_entries; j++) {
2367                         struct journal_entry *je;
2368                         je = access_journal_entry(ic, i, j);
2369                         io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
2370                 }
2371                 for (j = 0; j < ic->journal_section_sectors; j++) {
2372                         struct journal_sector *js;
2373                         js = access_journal(ic, i, j);
2374                         js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq);
2375                 }
2376                 i++;
2377                 if (unlikely(i >= ic->journal_sections))
2378                         ic->commit_seq = next_commit_seq(ic->commit_seq);
2379                 wraparound_section(ic, &i);
2380         }
2381         smp_rmb();
2382
2383         write_journal(ic, commit_start, commit_sections);
2384
2385         spin_lock_irq(&ic->endio_wait.lock);
2386         ic->uncommitted_section += commit_sections;
2387         wraparound_section(ic, &ic->uncommitted_section);
2388         ic->n_uncommitted_sections -= commit_sections;
2389         ic->n_committed_sections += commit_sections;
2390         spin_unlock_irq(&ic->endio_wait.lock);
2391
2392         if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold)
2393                 queue_work(ic->writer_wq, &ic->writer_work);
2394
2395 release_flush_bios:
2396         while (flushes) {
2397                 struct bio *next = flushes->bi_next;
2398                 flushes->bi_next = NULL;
2399                 do_endio(ic, flushes);
2400                 flushes = next;
2401         }
2402 }
2403
2404 static void complete_copy_from_journal(unsigned long error, void *context)
2405 {
2406         struct journal_io *io = context;
2407         struct journal_completion *comp = io->comp;
2408         struct dm_integrity_c *ic = comp->ic;
2409         remove_range(ic, &io->range);
2410         mempool_free(io, &ic->journal_io_mempool);
2411         if (unlikely(error != 0))
2412                 dm_integrity_io_error(ic, "copying from journal", -EIO);
2413         complete_journal_op(comp);
2414 }
2415
2416 static void restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js,
2417                                struct journal_entry *je)
2418 {
2419         unsigned s = 0;
2420         do {
2421                 js->commit_id = je->last_bytes[s];
2422                 js++;
2423         } while (++s < ic->sectors_per_block);
2424 }
2425
2426 static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start,
2427                              unsigned write_sections, bool from_replay)
2428 {
2429         unsigned i, j, n;
2430         struct journal_completion comp;
2431         struct blk_plug plug;
2432
2433         blk_start_plug(&plug);
2434
2435         comp.ic = ic;
2436         comp.in_flight = (atomic_t)ATOMIC_INIT(1);
2437         init_completion(&comp.comp);
2438
2439         i = write_start;
2440         for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) {
2441 #ifndef INTERNAL_VERIFY
2442                 if (unlikely(from_replay))
2443 #endif
2444                         rw_section_mac(ic, i, false);
2445                 for (j = 0; j < ic->journal_section_entries; j++) {
2446                         struct journal_entry *je = access_journal_entry(ic, i, j);
2447                         sector_t sec, area, offset;
2448                         unsigned k, l, next_loop;
2449                         sector_t metadata_block;
2450                         unsigned metadata_offset;
2451                         struct journal_io *io;
2452
2453                         if (journal_entry_is_unused(je))
2454                                 continue;
2455                         BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay);
2456                         sec = journal_entry_get_sector(je);
2457                         if (unlikely(from_replay)) {
2458                                 if (unlikely(sec & (unsigned)(ic->sectors_per_block - 1))) {
2459                                         dm_integrity_io_error(ic, "invalid sector in journal", -EIO);
2460                                         sec &= ~(sector_t)(ic->sectors_per_block - 1);
2461                                 }
2462                         }
2463                         if (unlikely(sec >= ic->provided_data_sectors))
2464                                 continue;
2465                         get_area_and_offset(ic, sec, &area, &offset);
2466                         restore_last_bytes(ic, access_journal_data(ic, i, j), je);
2467                         for (k = j + 1; k < ic->journal_section_entries; k++) {
2468                                 struct journal_entry *je2 = access_journal_entry(ic, i, k);
2469                                 sector_t sec2, area2, offset2;
2470                                 if (journal_entry_is_unused(je2))
2471                                         break;
2472                                 BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay);
2473                                 sec2 = journal_entry_get_sector(je2);
2474                                 if (unlikely(sec2 >= ic->provided_data_sectors))
2475                                         break;
2476                                 get_area_and_offset(ic, sec2, &area2, &offset2);
2477                                 if (area2 != area || offset2 != offset + ((k - j) << ic->sb->log2_sectors_per_block))
2478                                         break;
2479                                 restore_last_bytes(ic, access_journal_data(ic, i, k), je2);
2480                         }
2481                         next_loop = k - 1;
2482
2483                         io = mempool_alloc(&ic->journal_io_mempool, GFP_NOIO);
2484                         io->comp = &comp;
2485                         io->range.logical_sector = sec;
2486                         io->range.n_sectors = (k - j) << ic->sb->log2_sectors_per_block;
2487
2488                         spin_lock_irq(&ic->endio_wait.lock);
2489                         add_new_range_and_wait(ic, &io->range);
2490
2491                         if (likely(!from_replay)) {
2492                                 struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries];
2493
2494                                 /* don't write if there is newer committed sector */
2495                                 while (j < k && find_newer_committed_node(ic, &section_node[j])) {
2496                                         struct journal_entry *je2 = access_journal_entry(ic, i, j);
2497
2498                                         journal_entry_set_unused(je2);
2499                                         remove_journal_node(ic, &section_node[j]);
2500                                         j++;
2501                                         sec += ic->sectors_per_block;
2502                                         offset += ic->sectors_per_block;
2503                                 }
2504                                 while (j < k && find_newer_committed_node(ic, &section_node[k - 1])) {
2505                                         struct journal_entry *je2 = access_journal_entry(ic, i, k - 1);
2506
2507                                         journal_entry_set_unused(je2);
2508                                         remove_journal_node(ic, &section_node[k - 1]);
2509                                         k--;
2510                                 }
2511                                 if (j == k) {
2512                                         remove_range_unlocked(ic, &io->range);
2513                                         spin_unlock_irq(&ic->endio_wait.lock);
2514                                         mempool_free(io, &ic->journal_io_mempool);
2515                                         goto skip_io;
2516                                 }
2517                                 for (l = j; l < k; l++) {
2518                                         remove_journal_node(ic, &section_node[l]);
2519                                 }
2520                         }
2521                         spin_unlock_irq(&ic->endio_wait.lock);
2522
2523                         metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2524                         for (l = j; l < k; l++) {
2525                                 int r;
2526                                 struct journal_entry *je2 = access_journal_entry(ic, i, l);
2527
2528                                 if (
2529 #ifndef INTERNAL_VERIFY
2530                                     unlikely(from_replay) &&
2531 #endif
2532                                     ic->internal_hash) {
2533                                         char test_tag[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
2534
2535                                         integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block),
2536                                                                   (char *)access_journal_data(ic, i, l), test_tag);
2537                                         if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size)))
2538                                                 dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ);
2539                                 }
2540
2541                                 journal_entry_set_unused(je2);
2542                                 r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset,
2543                                                         ic->tag_size, TAG_WRITE);
2544                                 if (unlikely(r)) {
2545                                         dm_integrity_io_error(ic, "reading tags", r);
2546                                 }
2547                         }
2548
2549                         atomic_inc(&comp.in_flight);
2550                         copy_from_journal(ic, i, j << ic->sb->log2_sectors_per_block,
2551                                           (k - j) << ic->sb->log2_sectors_per_block,
2552                                           get_data_sector(ic, area, offset),
2553                                           complete_copy_from_journal, io);
2554 skip_io:
2555                         j = next_loop;
2556                 }
2557         }
2558
2559         dm_bufio_write_dirty_buffers_async(ic->bufio);
2560
2561         blk_finish_plug(&plug);
2562
2563         complete_journal_op(&comp);
2564         wait_for_completion_io(&comp.comp);
2565
2566         dm_integrity_flush_buffers(ic, true);
2567 }
2568
2569 static void integrity_writer(struct work_struct *w)
2570 {
2571         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work);
2572         unsigned write_start, write_sections;
2573
2574         unsigned prev_free_sectors;
2575
2576         /* the following test is not needed, but it tests the replay code */
2577         if (unlikely(dm_post_suspending(ic->ti)) && !ic->meta_dev)
2578                 return;
2579
2580         spin_lock_irq(&ic->endio_wait.lock);
2581         write_start = ic->committed_section;
2582         write_sections = ic->n_committed_sections;
2583         spin_unlock_irq(&ic->endio_wait.lock);
2584
2585         if (!write_sections)
2586                 return;
2587
2588         do_journal_write(ic, write_start, write_sections, false);
2589
2590         spin_lock_irq(&ic->endio_wait.lock);
2591
2592         ic->committed_section += write_sections;
2593         wraparound_section(ic, &ic->committed_section);
2594         ic->n_committed_sections -= write_sections;
2595
2596         prev_free_sectors = ic->free_sectors;
2597         ic->free_sectors += write_sections * ic->journal_section_entries;
2598         if (unlikely(!prev_free_sectors))
2599                 wake_up_locked(&ic->endio_wait);
2600
2601         spin_unlock_irq(&ic->endio_wait.lock);
2602 }
2603
2604 static void recalc_write_super(struct dm_integrity_c *ic)
2605 {
2606         int r;
2607
2608         dm_integrity_flush_buffers(ic, false);
2609         if (dm_integrity_failed(ic))
2610                 return;
2611
2612         r = sync_rw_sb(ic, REQ_OP_WRITE, 0);
2613         if (unlikely(r))
2614                 dm_integrity_io_error(ic, "writing superblock", r);
2615 }
2616
2617 static void integrity_recalc(struct work_struct *w)
2618 {
2619         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, recalc_work);
2620         struct dm_integrity_range range;
2621         struct dm_io_request io_req;
2622         struct dm_io_region io_loc;
2623         sector_t area, offset;
2624         sector_t metadata_block;
2625         unsigned metadata_offset;
2626         sector_t logical_sector, n_sectors;
2627         __u8 *t;
2628         unsigned i;
2629         int r;
2630         unsigned super_counter = 0;
2631
2632         DEBUG_print("start recalculation... (position %llx)\n", le64_to_cpu(ic->sb->recalc_sector));
2633
2634         spin_lock_irq(&ic->endio_wait.lock);
2635
2636 next_chunk:
2637
2638         if (unlikely(dm_post_suspending(ic->ti)))
2639                 goto unlock_ret;
2640
2641         range.logical_sector = le64_to_cpu(ic->sb->recalc_sector);
2642         if (unlikely(range.logical_sector >= ic->provided_data_sectors)) {
2643                 if (ic->mode == 'B') {
2644                         block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
2645                         DEBUG_print("queue_delayed_work: bitmap_flush_work\n");
2646                         queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
2647                 }
2648                 goto unlock_ret;
2649         }
2650
2651         get_area_and_offset(ic, range.logical_sector, &area, &offset);
2652         range.n_sectors = min((sector_t)RECALC_SECTORS, ic->provided_data_sectors - range.logical_sector);
2653         if (!ic->meta_dev)
2654                 range.n_sectors = min(range.n_sectors, ((sector_t)1U << ic->sb->log2_interleave_sectors) - (unsigned)offset);
2655
2656         add_new_range_and_wait(ic, &range);
2657         spin_unlock_irq(&ic->endio_wait.lock);
2658         logical_sector = range.logical_sector;
2659         n_sectors = range.n_sectors;
2660
2661         if (ic->mode == 'B') {
2662                 if (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector, n_sectors, BITMAP_OP_TEST_ALL_CLEAR)) {
2663                         goto advance_and_next;
2664                 }
2665                 while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector,
2666                                        ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
2667                         logical_sector += ic->sectors_per_block;
2668                         n_sectors -= ic->sectors_per_block;
2669                         cond_resched();
2670                 }
2671                 while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector + n_sectors - ic->sectors_per_block,
2672                                        ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
2673                         n_sectors -= ic->sectors_per_block;
2674                         cond_resched();
2675                 }
2676                 get_area_and_offset(ic, logical_sector, &area, &offset);
2677         }
2678
2679         DEBUG_print("recalculating: %llx, %llx\n", logical_sector, n_sectors);
2680
2681         if (unlikely(++super_counter == RECALC_WRITE_SUPER)) {
2682                 recalc_write_super(ic);
2683                 if (ic->mode == 'B') {
2684                         queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2685                 }
2686                 super_counter = 0;
2687         }
2688
2689         if (unlikely(dm_integrity_failed(ic)))
2690                 goto err;
2691
2692         io_req.bi_op = REQ_OP_READ;
2693         io_req.bi_op_flags = 0;
2694         io_req.mem.type = DM_IO_VMA;
2695         io_req.mem.ptr.addr = ic->recalc_buffer;
2696         io_req.notify.fn = NULL;
2697         io_req.client = ic->io;
2698         io_loc.bdev = ic->dev->bdev;
2699         io_loc.sector = get_data_sector(ic, area, offset);
2700         io_loc.count = n_sectors;
2701
2702         r = dm_io(&io_req, 1, &io_loc, NULL);
2703         if (unlikely(r)) {
2704                 dm_integrity_io_error(ic, "reading data", r);
2705                 goto err;
2706         }
2707
2708         t = ic->recalc_tags;
2709         for (i = 0; i < n_sectors; i += ic->sectors_per_block) {
2710                 integrity_sector_checksum(ic, logical_sector + i, ic->recalc_buffer + (i << SECTOR_SHIFT), t);
2711                 t += ic->tag_size;
2712         }
2713
2714         metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2715
2716         r = dm_integrity_rw_tag(ic, ic->recalc_tags, &metadata_block, &metadata_offset, t - ic->recalc_tags, TAG_WRITE);
2717         if (unlikely(r)) {
2718                 dm_integrity_io_error(ic, "writing tags", r);
2719                 goto err;
2720         }
2721
2722         if (ic->mode == 'B') {
2723                 sector_t start, end;
2724                 start = (range.logical_sector >>
2725                          (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)) <<
2726                         (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2727                 end = ((range.logical_sector + range.n_sectors) >>
2728                        (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)) <<
2729                         (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2730                 block_bitmap_op(ic, ic->recalc_bitmap, start, end - start, BITMAP_OP_CLEAR);
2731         }
2732
2733 advance_and_next:
2734         cond_resched();
2735
2736         spin_lock_irq(&ic->endio_wait.lock);
2737         remove_range_unlocked(ic, &range);
2738         ic->sb->recalc_sector = cpu_to_le64(range.logical_sector + range.n_sectors);
2739         goto next_chunk;
2740
2741 err:
2742         remove_range(ic, &range);
2743         return;
2744
2745 unlock_ret:
2746         spin_unlock_irq(&ic->endio_wait.lock);
2747
2748         recalc_write_super(ic);
2749 }
2750
2751 static void bitmap_block_work(struct work_struct *w)
2752 {
2753         struct bitmap_block_status *bbs = container_of(w, struct bitmap_block_status, work);
2754         struct dm_integrity_c *ic = bbs->ic;
2755         struct bio *bio;
2756         struct bio_list bio_queue;
2757         struct bio_list waiting;
2758
2759         bio_list_init(&waiting);
2760
2761         spin_lock(&bbs->bio_queue_lock);
2762         bio_queue = bbs->bio_queue;
2763         bio_list_init(&bbs->bio_queue);
2764         spin_unlock(&bbs->bio_queue_lock);
2765
2766         while ((bio = bio_list_pop(&bio_queue))) {
2767                 struct dm_integrity_io *dio;
2768
2769                 dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2770
2771                 if (block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2772                                     dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
2773                         remove_range(ic, &dio->range);
2774                         INIT_WORK(&dio->work, integrity_bio_wait);
2775                         queue_work(ic->offload_wq, &dio->work);
2776                 } else {
2777                         block_bitmap_op(ic, ic->journal, dio->range.logical_sector,
2778                                         dio->range.n_sectors, BITMAP_OP_SET);
2779                         bio_list_add(&waiting, bio);
2780                 }
2781         }
2782
2783         if (bio_list_empty(&waiting))
2784                 return;
2785
2786         rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC,
2787                            bbs->idx * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT),
2788                            BITMAP_BLOCK_SIZE >> SECTOR_SHIFT, NULL);
2789
2790         while ((bio = bio_list_pop(&waiting))) {
2791                 struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2792
2793                 block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2794                                 dio->range.n_sectors, BITMAP_OP_SET);
2795
2796                 remove_range(ic, &dio->range);
2797                 INIT_WORK(&dio->work, integrity_bio_wait);
2798                 queue_work(ic->offload_wq, &dio->work);
2799         }
2800
2801         queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2802 }
2803
2804 static void bitmap_flush_work(struct work_struct *work)
2805 {
2806         struct dm_integrity_c *ic = container_of(work, struct dm_integrity_c, bitmap_flush_work.work);
2807         struct dm_integrity_range range;
2808         unsigned long limit;
2809         struct bio *bio;
2810
2811         dm_integrity_flush_buffers(ic, false);
2812
2813         range.logical_sector = 0;
2814         range.n_sectors = ic->provided_data_sectors;
2815
2816         spin_lock_irq(&ic->endio_wait.lock);
2817         add_new_range_and_wait(ic, &range);
2818         spin_unlock_irq(&ic->endio_wait.lock);
2819
2820         dm_integrity_flush_buffers(ic, true);
2821
2822         limit = ic->provided_data_sectors;
2823         if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
2824                 limit = le64_to_cpu(ic->sb->recalc_sector)
2825                         >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)
2826                         << (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2827         }
2828         /*DEBUG_print("zeroing journal\n");*/
2829         block_bitmap_op(ic, ic->journal, 0, limit, BITMAP_OP_CLEAR);
2830         block_bitmap_op(ic, ic->may_write_bitmap, 0, limit, BITMAP_OP_CLEAR);
2831
2832         rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
2833                            ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2834
2835         spin_lock_irq(&ic->endio_wait.lock);
2836         remove_range_unlocked(ic, &range);
2837         while (unlikely((bio = bio_list_pop(&ic->synchronous_bios)) != NULL)) {
2838                 bio_endio(bio);
2839                 spin_unlock_irq(&ic->endio_wait.lock);
2840                 spin_lock_irq(&ic->endio_wait.lock);
2841         }
2842         spin_unlock_irq(&ic->endio_wait.lock);
2843 }
2844
2845
2846 static void init_journal(struct dm_integrity_c *ic, unsigned start_section,
2847                          unsigned n_sections, unsigned char commit_seq)
2848 {
2849         unsigned i, j, n;
2850
2851         if (!n_sections)
2852                 return;
2853
2854         for (n = 0; n < n_sections; n++) {
2855                 i = start_section + n;
2856                 wraparound_section(ic, &i);
2857                 for (j = 0; j < ic->journal_section_sectors; j++) {
2858                         struct journal_sector *js = access_journal(ic, i, j);
2859                         memset(&js->entries, 0, JOURNAL_SECTOR_DATA);
2860                         js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq);
2861                 }
2862                 for (j = 0; j < ic->journal_section_entries; j++) {
2863                         struct journal_entry *je = access_journal_entry(ic, i, j);
2864                         journal_entry_set_unused(je);
2865                 }
2866         }
2867
2868         write_journal(ic, start_section, n_sections);
2869 }
2870
2871 static int find_commit_seq(struct dm_integrity_c *ic, unsigned i, unsigned j, commit_id_t id)
2872 {
2873         unsigned char k;
2874         for (k = 0; k < N_COMMIT_IDS; k++) {
2875                 if (dm_integrity_commit_id(ic, i, j, k) == id)
2876                         return k;
2877         }
2878         dm_integrity_io_error(ic, "journal commit id", -EIO);
2879         return -EIO;
2880 }
2881
2882 static void replay_journal(struct dm_integrity_c *ic)
2883 {
2884         unsigned i, j;
2885         bool used_commit_ids[N_COMMIT_IDS];
2886         unsigned max_commit_id_sections[N_COMMIT_IDS];
2887         unsigned write_start, write_sections;
2888         unsigned continue_section;
2889         bool journal_empty;
2890         unsigned char unused, last_used, want_commit_seq;
2891
2892         if (ic->mode == 'R')
2893                 return;
2894
2895         if (ic->journal_uptodate)
2896                 return;
2897
2898         last_used = 0;
2899         write_start = 0;
2900
2901         if (!ic->just_formatted) {
2902                 DEBUG_print("reading journal\n");
2903                 rw_journal(ic, REQ_OP_READ, 0, 0, ic->journal_sections, NULL);
2904                 if (ic->journal_io)
2905                         DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal");
2906                 if (ic->journal_io) {
2907                         struct journal_completion crypt_comp;
2908                         crypt_comp.ic = ic;
2909                         init_completion(&crypt_comp.comp);
2910                         crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0);
2911                         encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp);
2912                         wait_for_completion(&crypt_comp.comp);
2913                 }
2914                 DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal");
2915         }
2916
2917         if (dm_integrity_failed(ic))
2918                 goto clear_journal;
2919
2920         journal_empty = true;
2921         memset(used_commit_ids, 0, sizeof used_commit_ids);
2922         memset(max_commit_id_sections, 0, sizeof max_commit_id_sections);
2923         for (i = 0; i < ic->journal_sections; i++) {
2924                 for (j = 0; j < ic->journal_section_sectors; j++) {
2925                         int k;
2926                         struct journal_sector *js = access_journal(ic, i, j);
2927                         k = find_commit_seq(ic, i, j, js->commit_id);
2928                         if (k < 0)
2929                                 goto clear_journal;
2930                         used_commit_ids[k] = true;
2931                         max_commit_id_sections[k] = i;
2932                 }
2933                 if (journal_empty) {
2934                         for (j = 0; j < ic->journal_section_entries; j++) {
2935                                 struct journal_entry *je = access_journal_entry(ic, i, j);
2936                                 if (!journal_entry_is_unused(je)) {
2937                                         journal_empty = false;
2938                                         break;
2939                                 }
2940                         }
2941                 }
2942         }
2943
2944         if (!used_commit_ids[N_COMMIT_IDS - 1]) {
2945                 unused = N_COMMIT_IDS - 1;
2946                 while (unused && !used_commit_ids[unused - 1])
2947                         unused--;
2948         } else {
2949                 for (unused = 0; unused < N_COMMIT_IDS; unused++)
2950                         if (!used_commit_ids[unused])
2951                                 break;
2952                 if (unused == N_COMMIT_IDS) {
2953                         dm_integrity_io_error(ic, "journal commit ids", -EIO);
2954                         goto clear_journal;
2955                 }
2956         }
2957         DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n",
2958                     unused, used_commit_ids[0], used_commit_ids[1],
2959                     used_commit_ids[2], used_commit_ids[3]);
2960
2961         last_used = prev_commit_seq(unused);
2962         want_commit_seq = prev_commit_seq(last_used);
2963
2964         if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)])
2965                 journal_empty = true;
2966
2967         write_start = max_commit_id_sections[last_used] + 1;
2968         if (unlikely(write_start >= ic->journal_sections))
2969                 want_commit_seq = next_commit_seq(want_commit_seq);
2970         wraparound_section(ic, &write_start);
2971
2972         i = write_start;
2973         for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) {
2974                 for (j = 0; j < ic->journal_section_sectors; j++) {
2975                         struct journal_sector *js = access_journal(ic, i, j);
2976
2977                         if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) {
2978                                 /*
2979                                  * This could be caused by crash during writing.
2980                                  * We won't replay the inconsistent part of the
2981                                  * journal.
2982                                  */
2983                                 DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n",
2984                                             i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq);
2985                                 goto brk;
2986                         }
2987                 }
2988                 i++;
2989                 if (unlikely(i >= ic->journal_sections))
2990                         want_commit_seq = next_commit_seq(want_commit_seq);
2991                 wraparound_section(ic, &i);
2992         }
2993 brk:
2994
2995         if (!journal_empty) {
2996                 DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n",
2997                             write_sections, write_start, want_commit_seq);
2998                 do_journal_write(ic, write_start, write_sections, true);
2999         }
3000
3001         if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) {
3002                 continue_section = write_start;
3003                 ic->commit_seq = want_commit_seq;
3004                 DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq);
3005         } else {
3006                 unsigned s;
3007                 unsigned char erase_seq;
3008 clear_journal:
3009                 DEBUG_print("clearing journal\n");
3010
3011                 erase_seq = prev_commit_seq(prev_commit_seq(last_used));
3012                 s = write_start;
3013                 init_journal(ic, s, 1, erase_seq);
3014                 s++;
3015                 wraparound_section(ic, &s);
3016                 if (ic->journal_sections >= 2) {
3017                         init_journal(ic, s, ic->journal_sections - 2, erase_seq);
3018                         s += ic->journal_sections - 2;
3019                         wraparound_section(ic, &s);
3020                         init_journal(ic, s, 1, erase_seq);
3021                 }
3022
3023                 continue_section = 0;
3024                 ic->commit_seq = next_commit_seq(erase_seq);
3025         }
3026
3027         ic->committed_section = continue_section;
3028         ic->n_committed_sections = 0;
3029
3030         ic->uncommitted_section = continue_section;
3031         ic->n_uncommitted_sections = 0;
3032
3033         ic->free_section = continue_section;
3034         ic->free_section_entry = 0;
3035         ic->free_sectors = ic->journal_entries;
3036
3037         ic->journal_tree_root = RB_ROOT;
3038         for (i = 0; i < ic->journal_entries; i++)
3039                 init_journal_node(&ic->journal_tree[i]);
3040 }
3041
3042 static void dm_integrity_enter_synchronous_mode(struct dm_integrity_c *ic)
3043 {
3044         DEBUG_print("dm_integrity_enter_synchronous_mode\n");
3045
3046         if (ic->mode == 'B') {
3047                 ic->bitmap_flush_interval = msecs_to_jiffies(10) + 1;
3048                 ic->synchronous_mode = 1;
3049
3050                 cancel_delayed_work_sync(&ic->bitmap_flush_work);
3051                 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
3052                 flush_workqueue(ic->commit_wq);
3053         }
3054 }
3055
3056 static int dm_integrity_reboot(struct notifier_block *n, unsigned long code, void *x)
3057 {
3058         struct dm_integrity_c *ic = container_of(n, struct dm_integrity_c, reboot_notifier);
3059
3060         DEBUG_print("dm_integrity_reboot\n");
3061
3062         dm_integrity_enter_synchronous_mode(ic);
3063
3064         return NOTIFY_DONE;
3065 }
3066
3067 static void dm_integrity_postsuspend(struct dm_target *ti)
3068 {
3069         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
3070         int r;
3071
3072         WARN_ON(unregister_reboot_notifier(&ic->reboot_notifier));
3073
3074         del_timer_sync(&ic->autocommit_timer);
3075
3076         if (ic->recalc_wq)
3077                 drain_workqueue(ic->recalc_wq);
3078
3079         if (ic->mode == 'B')
3080                 cancel_delayed_work_sync(&ic->bitmap_flush_work);
3081
3082         queue_work(ic->commit_wq, &ic->commit_work);
3083         drain_workqueue(ic->commit_wq);
3084
3085         if (ic->mode == 'J') {
3086                 if (ic->meta_dev)
3087                         queue_work(ic->writer_wq, &ic->writer_work);
3088                 drain_workqueue(ic->writer_wq);
3089                 dm_integrity_flush_buffers(ic, true);
3090         }
3091
3092         if (ic->mode == 'B') {
3093                 dm_integrity_flush_buffers(ic, true);
3094 #if 1
3095                 /* set to 0 to test bitmap replay code */
3096                 init_journal(ic, 0, ic->journal_sections, 0);
3097                 ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3098                 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
3099                 if (unlikely(r))
3100                         dm_integrity_io_error(ic, "writing superblock", r);
3101 #endif
3102         }
3103
3104         BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
3105
3106         ic->journal_uptodate = true;
3107 }
3108
3109 static void dm_integrity_resume(struct dm_target *ti)
3110 {
3111         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
3112         __u64 old_provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
3113         int r;
3114
3115         DEBUG_print("resume\n");
3116
3117         if (ic->provided_data_sectors != old_provided_data_sectors) {
3118                 if (ic->provided_data_sectors > old_provided_data_sectors &&
3119                     ic->mode == 'B' &&
3120                     ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) {
3121                         rw_journal_sectors(ic, REQ_OP_READ, 0, 0,
3122                                            ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3123                         block_bitmap_op(ic, ic->journal, old_provided_data_sectors,
3124                                         ic->provided_data_sectors - old_provided_data_sectors, BITMAP_OP_SET);
3125                         rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
3126                                            ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3127                 }
3128
3129                 ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
3130                 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
3131                 if (unlikely(r))
3132                         dm_integrity_io_error(ic, "writing superblock", r);
3133         }
3134
3135         if (ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP)) {
3136                 DEBUG_print("resume dirty_bitmap\n");
3137                 rw_journal_sectors(ic, REQ_OP_READ, 0, 0,
3138                                    ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3139                 if (ic->mode == 'B') {
3140                         if (ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
3141                             !ic->reset_recalculate_flag) {
3142                                 block_bitmap_copy(ic, ic->recalc_bitmap, ic->journal);
3143                                 block_bitmap_copy(ic, ic->may_write_bitmap, ic->journal);
3144                                 if (!block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors,
3145                                                      BITMAP_OP_TEST_ALL_CLEAR)) {
3146                                         ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3147                                         ic->sb->recalc_sector = cpu_to_le64(0);
3148                                 }
3149                         } else {
3150                                 DEBUG_print("non-matching blocks_per_bitmap_bit: %u, %u\n",
3151                                             ic->sb->log2_blocks_per_bitmap_bit, ic->log2_blocks_per_bitmap_bit);
3152                                 ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
3153                                 block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3154                                 block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3155                                 block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3156                                 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
3157                                                    ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3158                                 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3159                                 ic->sb->recalc_sector = cpu_to_le64(0);
3160                         }
3161                 } else {
3162                         if (!(ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
3163                               block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR)) ||
3164                             ic->reset_recalculate_flag) {
3165                                 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3166                                 ic->sb->recalc_sector = cpu_to_le64(0);
3167                         }
3168                         init_journal(ic, 0, ic->journal_sections, 0);
3169                         replay_journal(ic);
3170                         ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3171                 }
3172                 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
3173                 if (unlikely(r))
3174                         dm_integrity_io_error(ic, "writing superblock", r);
3175         } else {
3176                 replay_journal(ic);
3177                 if (ic->reset_recalculate_flag) {
3178                         ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3179                         ic->sb->recalc_sector = cpu_to_le64(0);
3180                 }
3181                 if (ic->mode == 'B') {
3182                         ic->sb->flags |= cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3183                         ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
3184                         r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
3185                         if (unlikely(r))
3186                                 dm_integrity_io_error(ic, "writing superblock", r);
3187
3188                         block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3189                         block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3190                         block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3191                         if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
3192                             le64_to_cpu(ic->sb->recalc_sector) < ic->provided_data_sectors) {
3193                                 block_bitmap_op(ic, ic->journal, le64_to_cpu(ic->sb->recalc_sector),
3194                                                 ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3195                                 block_bitmap_op(ic, ic->recalc_bitmap, le64_to_cpu(ic->sb->recalc_sector),
3196                                                 ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3197                                 block_bitmap_op(ic, ic->may_write_bitmap, le64_to_cpu(ic->sb->recalc_sector),
3198                                                 ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3199                         }
3200                         rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
3201                                            ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3202                 }
3203         }
3204
3205         DEBUG_print("testing recalc: %x\n", ic->sb->flags);
3206         if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
3207                 __u64 recalc_pos = le64_to_cpu(ic->sb->recalc_sector);
3208                 DEBUG_print("recalc pos: %llx / %llx\n", recalc_pos, ic->provided_data_sectors);
3209                 if (recalc_pos < ic->provided_data_sectors) {
3210                         queue_work(ic->recalc_wq, &ic->recalc_work);
3211                 } else if (recalc_pos > ic->provided_data_sectors) {
3212                         ic->sb->recalc_sector = cpu_to_le64(ic->provided_data_sectors);
3213                         recalc_write_super(ic);
3214                 }
3215         }
3216
3217         ic->reboot_notifier.notifier_call = dm_integrity_reboot;
3218         ic->reboot_notifier.next = NULL;
3219         ic->reboot_notifier.priority = INT_MAX - 1;     /* be notified after md and before hardware drivers */
3220         WARN_ON(register_reboot_notifier(&ic->reboot_notifier));
3221
3222 #if 0
3223         /* set to 1 to stress test synchronous mode */
3224         dm_integrity_enter_synchronous_mode(ic);
3225 #endif
3226 }
3227
3228 static void dm_integrity_status(struct dm_target *ti, status_type_t type,
3229                                 unsigned status_flags, char *result, unsigned maxlen)
3230 {
3231         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
3232         unsigned arg_count;
3233         size_t sz = 0;
3234
3235         switch (type) {
3236         case STATUSTYPE_INFO:
3237                 DMEMIT("%llu %llu",
3238                         (unsigned long long)atomic64_read(&ic->number_of_mismatches),
3239                         ic->provided_data_sectors);
3240                 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
3241                         DMEMIT(" %llu", le64_to_cpu(ic->sb->recalc_sector));
3242                 else
3243                         DMEMIT(" -");
3244                 break;
3245
3246         case STATUSTYPE_TABLE: {
3247                 __u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100;
3248                 watermark_percentage += ic->journal_entries / 2;
3249                 do_div(watermark_percentage, ic->journal_entries);
3250                 arg_count = 3;
3251                 arg_count += !!ic->meta_dev;
3252                 arg_count += ic->sectors_per_block != 1;
3253                 arg_count += !!(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING));
3254                 arg_count += ic->reset_recalculate_flag;
3255                 arg_count += ic->discard;
3256                 arg_count += ic->mode == 'J';
3257                 arg_count += ic->mode == 'J';
3258                 arg_count += ic->mode == 'B';
3259                 arg_count += ic->mode == 'B';
3260                 arg_count += !!ic->internal_hash_alg.alg_string;
3261                 arg_count += !!ic->journal_crypt_alg.alg_string;
3262                 arg_count += !!ic->journal_mac_alg.alg_string;
3263                 arg_count += (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0;
3264                 arg_count += (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0;
3265                 arg_count += ic->legacy_recalculate;
3266                 DMEMIT("%s %llu %u %c %u", ic->dev->name, ic->start,
3267                        ic->tag_size, ic->mode, arg_count);
3268                 if (ic->meta_dev)
3269                         DMEMIT(" meta_device:%s", ic->meta_dev->name);
3270                 if (ic->sectors_per_block != 1)
3271                         DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
3272                 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
3273                         DMEMIT(" recalculate");
3274                 if (ic->reset_recalculate_flag)
3275                         DMEMIT(" reset_recalculate");
3276                 if (ic->discard)
3277                         DMEMIT(" allow_discards");
3278                 DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
3279                 DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors);
3280                 DMEMIT(" buffer_sectors:%u", 1U << ic->log2_buffer_sectors);
3281                 if (ic->mode == 'J') {
3282                         DMEMIT(" journal_watermark:%u", (unsigned)watermark_percentage);
3283                         DMEMIT(" commit_time:%u", ic->autocommit_msec);
3284                 }
3285                 if (ic->mode == 'B') {
3286                         DMEMIT(" sectors_per_bit:%llu", (sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit);
3287                         DMEMIT(" bitmap_flush_interval:%u", jiffies_to_msecs(ic->bitmap_flush_interval));
3288                 }
3289                 if ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0)
3290                         DMEMIT(" fix_padding");
3291                 if ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0)
3292                         DMEMIT(" fix_hmac");
3293                 if (ic->legacy_recalculate)
3294                         DMEMIT(" legacy_recalculate");
3295
3296 #define EMIT_ALG(a, n)                                                  \
3297                 do {                                                    \
3298                         if (ic->a.alg_string) {                         \
3299                                 DMEMIT(" %s:%s", n, ic->a.alg_string);  \
3300                                 if (ic->a.key_string)                   \
3301                                         DMEMIT(":%s", ic->a.key_string);\
3302                         }                                               \
3303                 } while (0)
3304                 EMIT_ALG(internal_hash_alg, "internal_hash");
3305                 EMIT_ALG(journal_crypt_alg, "journal_crypt");
3306                 EMIT_ALG(journal_mac_alg, "journal_mac");
3307                 break;
3308         }
3309         case STATUSTYPE_IMA:
3310                 DMEMIT_TARGET_NAME_VERSION(ti->type);
3311                 DMEMIT(",dev_name=%s,start=%llu,tag_size=%u,mode=%c",
3312                         ic->dev->name, ic->start, ic->tag_size, ic->mode);
3313
3314                 if (ic->meta_dev)
3315                         DMEMIT(",meta_device=%s", ic->meta_dev->name);
3316                 if (ic->sectors_per_block != 1)
3317                         DMEMIT(",block_size=%u", ic->sectors_per_block << SECTOR_SHIFT);
3318
3319                 DMEMIT(",recalculate=%c", (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) ?
3320                        'y' : 'n');
3321                 DMEMIT(",allow_discards=%c", ic->discard ? 'y' : 'n');
3322                 DMEMIT(",fix_padding=%c",
3323                        ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0) ? 'y' : 'n');
3324                 DMEMIT(",fix_hmac=%c",
3325                        ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0) ? 'y' : 'n');
3326                 DMEMIT(",legacy_recalculate=%c", ic->legacy_recalculate ? 'y' : 'n');
3327
3328                 DMEMIT(",journal_sectors=%u", ic->initial_sectors - SB_SECTORS);
3329                 DMEMIT(",interleave_sectors=%u", 1U << ic->sb->log2_interleave_sectors);
3330                 DMEMIT(",buffer_sectors=%u", 1U << ic->log2_buffer_sectors);
3331                 DMEMIT(";");
3332                 break;
3333         }
3334 }
3335
3336 static int dm_integrity_iterate_devices(struct dm_target *ti,
3337                                         iterate_devices_callout_fn fn, void *data)
3338 {
3339         struct dm_integrity_c *ic = ti->private;
3340
3341         if (!ic->meta_dev)
3342                 return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data);
3343         else
3344                 return fn(ti, ic->dev, 0, ti->len, data);
3345 }
3346
3347 static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits)
3348 {
3349         struct dm_integrity_c *ic = ti->private;
3350
3351         if (ic->sectors_per_block > 1) {
3352                 limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
3353                 limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
3354                 blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT);
3355         }
3356 }
3357
3358 static void calculate_journal_section_size(struct dm_integrity_c *ic)
3359 {
3360         unsigned sector_space = JOURNAL_SECTOR_DATA;
3361
3362         ic->journal_sections = le32_to_cpu(ic->sb->journal_sections);
3363         ic->journal_entry_size = roundup(offsetof(struct journal_entry, last_bytes[ic->sectors_per_block]) + ic->tag_size,
3364                                          JOURNAL_ENTRY_ROUNDUP);
3365
3366         if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC))
3367                 sector_space -= JOURNAL_MAC_PER_SECTOR;
3368         ic->journal_entries_per_sector = sector_space / ic->journal_entry_size;
3369         ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS;
3370         ic->journal_section_sectors = (ic->journal_section_entries << ic->sb->log2_sectors_per_block) + JOURNAL_BLOCK_SECTORS;
3371         ic->journal_entries = ic->journal_section_entries * ic->journal_sections;
3372 }
3373
3374 static int calculate_device_limits(struct dm_integrity_c *ic)
3375 {
3376         __u64 initial_sectors;
3377
3378         calculate_journal_section_size(ic);
3379         initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections;
3380         if (initial_sectors + METADATA_PADDING_SECTORS >= ic->meta_device_sectors || initial_sectors > UINT_MAX)
3381                 return -EINVAL;
3382         ic->initial_sectors = initial_sectors;
3383
3384         if (!ic->meta_dev) {
3385                 sector_t last_sector, last_area, last_offset;
3386
3387                 /* we have to maintain excessive padding for compatibility with existing volumes */
3388                 __u64 metadata_run_padding =
3389                         ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING) ?
3390                         (__u64)(METADATA_PADDING_SECTORS << SECTOR_SHIFT) :
3391                         (__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS);
3392
3393                 ic->metadata_run = round_up((__u64)ic->tag_size << (ic->sb->log2_interleave_sectors - ic->sb->log2_sectors_per_block),
3394                                             metadata_run_padding) >> SECTOR_SHIFT;
3395                 if (!(ic->metadata_run & (ic->metadata_run - 1)))
3396                         ic->log2_metadata_run = __ffs(ic->metadata_run);
3397                 else
3398                         ic->log2_metadata_run = -1;
3399
3400                 get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset);
3401                 last_sector = get_data_sector(ic, last_area, last_offset);
3402                 if (last_sector < ic->start || last_sector >= ic->meta_device_sectors)
3403                         return -EINVAL;
3404         } else {
3405                 __u64 meta_size = (ic->provided_data_sectors >> ic->sb->log2_sectors_per_block) * ic->tag_size;
3406                 meta_size = (meta_size + ((1U << (ic->log2_buffer_sectors + SECTOR_SHIFT)) - 1))
3407                                 >> (ic->log2_buffer_sectors + SECTOR_SHIFT);
3408                 meta_size <<= ic->log2_buffer_sectors;
3409                 if (ic->initial_sectors + meta_size < ic->initial_sectors ||
3410                     ic->initial_sectors + meta_size > ic->meta_device_sectors)
3411                         return -EINVAL;
3412                 ic->metadata_run = 1;
3413                 ic->log2_metadata_run = 0;
3414         }
3415
3416         return 0;
3417 }
3418
3419 static void get_provided_data_sectors(struct dm_integrity_c *ic)
3420 {
3421         if (!ic->meta_dev) {
3422                 int test_bit;
3423                 ic->provided_data_sectors = 0;
3424                 for (test_bit = fls64(ic->meta_device_sectors) - 1; test_bit >= 3; test_bit--) {
3425                         __u64 prev_data_sectors = ic->provided_data_sectors;
3426
3427                         ic->provided_data_sectors |= (sector_t)1 << test_bit;
3428                         if (calculate_device_limits(ic))
3429                                 ic->provided_data_sectors = prev_data_sectors;
3430                 }
3431         } else {
3432                 ic->provided_data_sectors = ic->data_device_sectors;
3433                 ic->provided_data_sectors &= ~(sector_t)(ic->sectors_per_block - 1);
3434         }
3435 }
3436
3437 static int initialize_superblock(struct dm_integrity_c *ic, unsigned journal_sectors, unsigned interleave_sectors)
3438 {
3439         unsigned journal_sections;
3440         int test_bit;
3441
3442         memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT);
3443         memcpy(ic->sb->magic, SB_MAGIC, 8);
3444         ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size);
3445         ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block);
3446         if (ic->journal_mac_alg.alg_string)
3447                 ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC);
3448
3449         calculate_journal_section_size(ic);
3450         journal_sections = journal_sectors / ic->journal_section_sectors;
3451         if (!journal_sections)
3452                 journal_sections = 1;
3453
3454         if (ic->fix_hmac && (ic->internal_hash_alg.alg_string || ic->journal_mac_alg.alg_string)) {
3455                 ic->sb->flags |= cpu_to_le32(SB_FLAG_FIXED_HMAC);
3456                 get_random_bytes(ic->sb->salt, SALT_SIZE);
3457         }
3458
3459         if (!ic->meta_dev) {
3460                 if (ic->fix_padding)
3461                         ic->sb->flags |= cpu_to_le32(SB_FLAG_FIXED_PADDING);
3462                 ic->sb->journal_sections = cpu_to_le32(journal_sections);
3463                 if (!interleave_sectors)
3464                         interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
3465                 ic->sb->log2_interleave_sectors = __fls(interleave_sectors);
3466                 ic->sb->log2_interleave_sectors = max((__u8)MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3467                 ic->sb->log2_interleave_sectors = min((__u8)MAX_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3468
3469                 get_provided_data_sectors(ic);
3470                 if (!ic->provided_data_sectors)
3471                         return -EINVAL;
3472         } else {
3473                 ic->sb->log2_interleave_sectors = 0;
3474
3475                 get_provided_data_sectors(ic);
3476                 if (!ic->provided_data_sectors)
3477                         return -EINVAL;
3478
3479 try_smaller_buffer:
3480                 ic->sb->journal_sections = cpu_to_le32(0);
3481                 for (test_bit = fls(journal_sections) - 1; test_bit >= 0; test_bit--) {
3482                         __u32 prev_journal_sections = le32_to_cpu(ic->sb->journal_sections);
3483                         __u32 test_journal_sections = prev_journal_sections | (1U << test_bit);
3484                         if (test_journal_sections > journal_sections)
3485                                 continue;
3486                         ic->sb->journal_sections = cpu_to_le32(test_journal_sections);
3487                         if (calculate_device_limits(ic))
3488                                 ic->sb->journal_sections = cpu_to_le32(prev_journal_sections);
3489
3490                 }
3491                 if (!le32_to_cpu(ic->sb->journal_sections)) {
3492                         if (ic->log2_buffer_sectors > 3) {
3493                                 ic->log2_buffer_sectors--;
3494                                 goto try_smaller_buffer;
3495                         }
3496                         return -EINVAL;
3497                 }
3498         }
3499
3500         ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
3501
3502         sb_set_version(ic);
3503
3504         return 0;
3505 }
3506
3507 static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic)
3508 {
3509         struct gendisk *disk = dm_disk(dm_table_get_md(ti->table));
3510         struct blk_integrity bi;
3511
3512         memset(&bi, 0, sizeof(bi));
3513         bi.profile = &dm_integrity_profile;
3514         bi.tuple_size = ic->tag_size;
3515         bi.tag_size = bi.tuple_size;
3516         bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT;
3517
3518         blk_integrity_register(disk, &bi);
3519         blk_queue_max_integrity_segments(disk->queue, UINT_MAX);
3520 }
3521
3522 static void dm_integrity_free_page_list(struct page_list *pl)
3523 {
3524         unsigned i;
3525
3526         if (!pl)
3527                 return;
3528         for (i = 0; pl[i].page; i++)
3529                 __free_page(pl[i].page);
3530         kvfree(pl);
3531 }
3532
3533 static struct page_list *dm_integrity_alloc_page_list(unsigned n_pages)
3534 {
3535         struct page_list *pl;
3536         unsigned i;
3537
3538         pl = kvmalloc_array(n_pages + 1, sizeof(struct page_list), GFP_KERNEL | __GFP_ZERO);
3539         if (!pl)
3540                 return NULL;
3541
3542         for (i = 0; i < n_pages; i++) {
3543                 pl[i].page = alloc_page(GFP_KERNEL);
3544                 if (!pl[i].page) {
3545                         dm_integrity_free_page_list(pl);
3546                         return NULL;
3547                 }
3548                 if (i)
3549                         pl[i - 1].next = &pl[i];
3550         }
3551         pl[i].page = NULL;
3552         pl[i].next = NULL;
3553
3554         return pl;
3555 }
3556
3557 static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl)
3558 {
3559         unsigned i;
3560         for (i = 0; i < ic->journal_sections; i++)
3561                 kvfree(sl[i]);
3562         kvfree(sl);
3563 }
3564
3565 static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic,
3566                                                                    struct page_list *pl)
3567 {
3568         struct scatterlist **sl;
3569         unsigned i;
3570
3571         sl = kvmalloc_array(ic->journal_sections,
3572                             sizeof(struct scatterlist *),
3573                             GFP_KERNEL | __GFP_ZERO);
3574         if (!sl)
3575                 return NULL;
3576
3577         for (i = 0; i < ic->journal_sections; i++) {
3578                 struct scatterlist *s;
3579                 unsigned start_index, start_offset;
3580                 unsigned end_index, end_offset;
3581                 unsigned n_pages;
3582                 unsigned idx;
3583
3584                 page_list_location(ic, i, 0, &start_index, &start_offset);
3585                 page_list_location(ic, i, ic->journal_section_sectors - 1,
3586                                    &end_index, &end_offset);
3587
3588                 n_pages = (end_index - start_index + 1);
3589
3590                 s = kvmalloc_array(n_pages, sizeof(struct scatterlist),
3591                                    GFP_KERNEL);
3592                 if (!s) {
3593                         dm_integrity_free_journal_scatterlist(ic, sl);
3594                         return NULL;
3595                 }
3596
3597                 sg_init_table(s, n_pages);
3598                 for (idx = start_index; idx <= end_index; idx++) {
3599                         char *va = lowmem_page_address(pl[idx].page);
3600                         unsigned start = 0, end = PAGE_SIZE;
3601                         if (idx == start_index)
3602                                 start = start_offset;
3603                         if (idx == end_index)
3604                                 end = end_offset + (1 << SECTOR_SHIFT);
3605                         sg_set_buf(&s[idx - start_index], va + start, end - start);
3606                 }
3607
3608                 sl[i] = s;
3609         }
3610
3611         return sl;
3612 }
3613
3614 static void free_alg(struct alg_spec *a)
3615 {
3616         kfree_sensitive(a->alg_string);
3617         kfree_sensitive(a->key);
3618         memset(a, 0, sizeof *a);
3619 }
3620
3621 static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval)
3622 {
3623         char *k;
3624
3625         free_alg(a);
3626
3627         a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL);
3628         if (!a->alg_string)
3629                 goto nomem;
3630
3631         k = strchr(a->alg_string, ':');
3632         if (k) {
3633                 *k = 0;
3634                 a->key_string = k + 1;
3635                 if (strlen(a->key_string) & 1)
3636                         goto inval;
3637
3638                 a->key_size = strlen(a->key_string) / 2;
3639                 a->key = kmalloc(a->key_size, GFP_KERNEL);
3640                 if (!a->key)
3641                         goto nomem;
3642                 if (hex2bin(a->key, a->key_string, a->key_size))
3643                         goto inval;
3644         }
3645
3646         return 0;
3647 inval:
3648         *error = error_inval;
3649         return -EINVAL;
3650 nomem:
3651         *error = "Out of memory for an argument";
3652         return -ENOMEM;
3653 }
3654
3655 static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error,
3656                    char *error_alg, char *error_key)
3657 {
3658         int r;
3659
3660         if (a->alg_string) {
3661                 *hash = crypto_alloc_shash(a->alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
3662                 if (IS_ERR(*hash)) {
3663                         *error = error_alg;
3664                         r = PTR_ERR(*hash);
3665                         *hash = NULL;
3666                         return r;
3667                 }
3668
3669                 if (a->key) {
3670                         r = crypto_shash_setkey(*hash, a->key, a->key_size);
3671                         if (r) {
3672                                 *error = error_key;
3673                                 return r;
3674                         }
3675                 } else if (crypto_shash_get_flags(*hash) & CRYPTO_TFM_NEED_KEY) {
3676                         *error = error_key;
3677                         return -ENOKEY;
3678                 }
3679         }
3680
3681         return 0;
3682 }
3683
3684 static int create_journal(struct dm_integrity_c *ic, char **error)
3685 {
3686         int r = 0;
3687         unsigned i;
3688         __u64 journal_pages, journal_desc_size, journal_tree_size;
3689         unsigned char *crypt_data = NULL, *crypt_iv = NULL;
3690         struct skcipher_request *req = NULL;
3691
3692         ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL);
3693         ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL);
3694         ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL);
3695         ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL);
3696
3697         journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
3698                                 PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
3699         journal_desc_size = journal_pages * sizeof(struct page_list);
3700         if (journal_pages >= totalram_pages() - totalhigh_pages() || journal_desc_size > ULONG_MAX) {
3701                 *error = "Journal doesn't fit into memory";
3702                 r = -ENOMEM;
3703                 goto bad;
3704         }
3705         ic->journal_pages = journal_pages;
3706
3707         ic->journal = dm_integrity_alloc_page_list(ic->journal_pages);
3708         if (!ic->journal) {
3709                 *error = "Could not allocate memory for journal";
3710                 r = -ENOMEM;
3711                 goto bad;
3712         }
3713         if (ic->journal_crypt_alg.alg_string) {
3714                 unsigned ivsize, blocksize;
3715                 struct journal_completion comp;
3716
3717                 comp.ic = ic;
3718                 ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
3719                 if (IS_ERR(ic->journal_crypt)) {
3720                         *error = "Invalid journal cipher";
3721                         r = PTR_ERR(ic->journal_crypt);
3722                         ic->journal_crypt = NULL;
3723                         goto bad;
3724                 }
3725                 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
3726                 blocksize = crypto_skcipher_blocksize(ic->journal_crypt);
3727
3728                 if (ic->journal_crypt_alg.key) {
3729                         r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key,
3730                                                    ic->journal_crypt_alg.key_size);
3731                         if (r) {
3732                                 *error = "Error setting encryption key";
3733                                 goto bad;
3734                         }
3735                 }
3736                 DEBUG_print("cipher %s, block size %u iv size %u\n",
3737                             ic->journal_crypt_alg.alg_string, blocksize, ivsize);
3738
3739                 ic->journal_io = dm_integrity_alloc_page_list(ic->journal_pages);
3740                 if (!ic->journal_io) {
3741                         *error = "Could not allocate memory for journal io";
3742                         r = -ENOMEM;
3743                         goto bad;
3744                 }
3745
3746                 if (blocksize == 1) {
3747                         struct scatterlist *sg;
3748
3749                         req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3750                         if (!req) {
3751                                 *error = "Could not allocate crypt request";
3752                                 r = -ENOMEM;
3753                                 goto bad;
3754                         }
3755
3756                         crypt_iv = kzalloc(ivsize, GFP_KERNEL);
3757                         if (!crypt_iv) {
3758                                 *error = "Could not allocate iv";
3759                                 r = -ENOMEM;
3760                                 goto bad;
3761                         }
3762
3763                         ic->journal_xor = dm_integrity_alloc_page_list(ic->journal_pages);
3764                         if (!ic->journal_xor) {
3765                                 *error = "Could not allocate memory for journal xor";
3766                                 r = -ENOMEM;
3767                                 goto bad;
3768                         }
3769
3770                         sg = kvmalloc_array(ic->journal_pages + 1,
3771                                             sizeof(struct scatterlist),
3772                                             GFP_KERNEL);
3773                         if (!sg) {
3774                                 *error = "Unable to allocate sg list";
3775                                 r = -ENOMEM;
3776                                 goto bad;
3777                         }
3778                         sg_init_table(sg, ic->journal_pages + 1);
3779                         for (i = 0; i < ic->journal_pages; i++) {
3780                                 char *va = lowmem_page_address(ic->journal_xor[i].page);
3781                                 clear_page(va);
3782                                 sg_set_buf(&sg[i], va, PAGE_SIZE);
3783                         }
3784                         sg_set_buf(&sg[i], &ic->commit_ids, sizeof ic->commit_ids);
3785
3786                         skcipher_request_set_crypt(req, sg, sg,
3787                                                    PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, crypt_iv);
3788                         init_completion(&comp.comp);
3789                         comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3790                         if (do_crypt(true, req, &comp))
3791                                 wait_for_completion(&comp.comp);
3792                         kvfree(sg);
3793                         r = dm_integrity_failed(ic);
3794                         if (r) {
3795                                 *error = "Unable to encrypt journal";
3796                                 goto bad;
3797                         }
3798                         DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data");
3799
3800                         crypto_free_skcipher(ic->journal_crypt);
3801                         ic->journal_crypt = NULL;
3802                 } else {
3803                         unsigned crypt_len = roundup(ivsize, blocksize);
3804
3805                         req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3806                         if (!req) {
3807                                 *error = "Could not allocate crypt request";
3808                                 r = -ENOMEM;
3809                                 goto bad;
3810                         }
3811
3812                         crypt_iv = kmalloc(ivsize, GFP_KERNEL);
3813                         if (!crypt_iv) {
3814                                 *error = "Could not allocate iv";
3815                                 r = -ENOMEM;
3816                                 goto bad;
3817                         }
3818
3819                         crypt_data = kmalloc(crypt_len, GFP_KERNEL);
3820                         if (!crypt_data) {
3821                                 *error = "Unable to allocate crypt data";
3822                                 r = -ENOMEM;
3823                                 goto bad;
3824                         }
3825
3826                         ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal);
3827                         if (!ic->journal_scatterlist) {
3828                                 *error = "Unable to allocate sg list";
3829                                 r = -ENOMEM;
3830                                 goto bad;
3831                         }
3832                         ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io);
3833                         if (!ic->journal_io_scatterlist) {
3834                                 *error = "Unable to allocate sg list";
3835                                 r = -ENOMEM;
3836                                 goto bad;
3837                         }
3838                         ic->sk_requests = kvmalloc_array(ic->journal_sections,
3839                                                          sizeof(struct skcipher_request *),
3840                                                          GFP_KERNEL | __GFP_ZERO);
3841                         if (!ic->sk_requests) {
3842                                 *error = "Unable to allocate sk requests";
3843                                 r = -ENOMEM;
3844                                 goto bad;
3845                         }
3846                         for (i = 0; i < ic->journal_sections; i++) {
3847                                 struct scatterlist sg;
3848                                 struct skcipher_request *section_req;
3849                                 __le32 section_le = cpu_to_le32(i);
3850
3851                                 memset(crypt_iv, 0x00, ivsize);
3852                                 memset(crypt_data, 0x00, crypt_len);
3853                                 memcpy(crypt_data, &section_le, min((size_t)crypt_len, sizeof(section_le)));
3854
3855                                 sg_init_one(&sg, crypt_data, crypt_len);
3856                                 skcipher_request_set_crypt(req, &sg, &sg, crypt_len, crypt_iv);
3857                                 init_completion(&comp.comp);
3858                                 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3859                                 if (do_crypt(true, req, &comp))
3860                                         wait_for_completion(&comp.comp);
3861
3862                                 r = dm_integrity_failed(ic);
3863                                 if (r) {
3864                                         *error = "Unable to generate iv";
3865                                         goto bad;
3866                                 }
3867
3868                                 section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3869                                 if (!section_req) {
3870                                         *error = "Unable to allocate crypt request";
3871                                         r = -ENOMEM;
3872                                         goto bad;
3873                                 }
3874                                 section_req->iv = kmalloc_array(ivsize, 2,
3875                                                                 GFP_KERNEL);
3876                                 if (!section_req->iv) {
3877                                         skcipher_request_free(section_req);
3878                                         *error = "Unable to allocate iv";
3879                                         r = -ENOMEM;
3880                                         goto bad;
3881                                 }
3882                                 memcpy(section_req->iv + ivsize, crypt_data, ivsize);
3883                                 section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT;
3884                                 ic->sk_requests[i] = section_req;
3885                                 DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i);
3886                         }
3887                 }
3888         }
3889
3890         for (i = 0; i < N_COMMIT_IDS; i++) {
3891                 unsigned j;
3892 retest_commit_id:
3893                 for (j = 0; j < i; j++) {
3894                         if (ic->commit_ids[j] == ic->commit_ids[i]) {
3895                                 ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1);
3896                                 goto retest_commit_id;
3897                         }
3898                 }
3899                 DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]);
3900         }
3901
3902         journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node);
3903         if (journal_tree_size > ULONG_MAX) {
3904                 *error = "Journal doesn't fit into memory";
3905                 r = -ENOMEM;
3906                 goto bad;
3907         }
3908         ic->journal_tree = kvmalloc(journal_tree_size, GFP_KERNEL);
3909         if (!ic->journal_tree) {
3910                 *error = "Could not allocate memory for journal tree";
3911                 r = -ENOMEM;
3912         }
3913 bad:
3914         kfree(crypt_data);
3915         kfree(crypt_iv);
3916         skcipher_request_free(req);
3917
3918         return r;
3919 }
3920
3921 /*
3922  * Construct a integrity mapping
3923  *
3924  * Arguments:
3925  *      device
3926  *      offset from the start of the device
3927  *      tag size
3928  *      D - direct writes, J - journal writes, B - bitmap mode, R - recovery mode
3929  *      number of optional arguments
3930  *      optional arguments:
3931  *              journal_sectors
3932  *              interleave_sectors
3933  *              buffer_sectors
3934  *              journal_watermark
3935  *              commit_time
3936  *              meta_device
3937  *              block_size
3938  *              sectors_per_bit
3939  *              bitmap_flush_interval
3940  *              internal_hash
3941  *              journal_crypt
3942  *              journal_mac
3943  *              recalculate
3944  */
3945 static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
3946 {
3947         struct dm_integrity_c *ic;
3948         char dummy;
3949         int r;
3950         unsigned extra_args;
3951         struct dm_arg_set as;
3952         static const struct dm_arg _args[] = {
3953                 {0, 18, "Invalid number of feature args"},
3954         };
3955         unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
3956         bool should_write_sb;
3957         __u64 threshold;
3958         unsigned long long start;
3959         __s8 log2_sectors_per_bitmap_bit = -1;
3960         __s8 log2_blocks_per_bitmap_bit;
3961         __u64 bits_in_journal;
3962         __u64 n_bitmap_bits;
3963
3964 #define DIRECT_ARGUMENTS        4
3965
3966         if (argc <= DIRECT_ARGUMENTS) {
3967                 ti->error = "Invalid argument count";
3968                 return -EINVAL;
3969         }
3970
3971         ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL);
3972         if (!ic) {
3973                 ti->error = "Cannot allocate integrity context";
3974                 return -ENOMEM;
3975         }
3976         ti->private = ic;
3977         ti->per_io_data_size = sizeof(struct dm_integrity_io);
3978         ic->ti = ti;
3979
3980         ic->in_progress = RB_ROOT;
3981         INIT_LIST_HEAD(&ic->wait_list);
3982         init_waitqueue_head(&ic->endio_wait);
3983         bio_list_init(&ic->flush_bio_list);
3984         init_waitqueue_head(&ic->copy_to_journal_wait);
3985         init_completion(&ic->crypto_backoff);
3986         atomic64_set(&ic->number_of_mismatches, 0);
3987         ic->bitmap_flush_interval = BITMAP_FLUSH_INTERVAL;
3988
3989         r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
3990         if (r) {
3991                 ti->error = "Device lookup failed";
3992                 goto bad;
3993         }
3994
3995         if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) {
3996                 ti->error = "Invalid starting offset";
3997                 r = -EINVAL;
3998                 goto bad;
3999         }
4000         ic->start = start;
4001
4002         if (strcmp(argv[2], "-")) {
4003                 if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) {
4004                         ti->error = "Invalid tag size";
4005                         r = -EINVAL;
4006                         goto bad;
4007                 }
4008         }
4009
4010         if (!strcmp(argv[3], "J") || !strcmp(argv[3], "B") ||
4011             !strcmp(argv[3], "D") || !strcmp(argv[3], "R")) {
4012                 ic->mode = argv[3][0];
4013         } else {
4014                 ti->error = "Invalid mode (expecting J, B, D, R)";
4015                 r = -EINVAL;
4016                 goto bad;
4017         }
4018
4019         journal_sectors = 0;
4020         interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
4021         buffer_sectors = DEFAULT_BUFFER_SECTORS;
4022         journal_watermark = DEFAULT_JOURNAL_WATERMARK;
4023         sync_msec = DEFAULT_SYNC_MSEC;
4024         ic->sectors_per_block = 1;
4025
4026         as.argc = argc - DIRECT_ARGUMENTS;
4027         as.argv = argv + DIRECT_ARGUMENTS;
4028         r = dm_read_arg_group(_args, &as, &extra_args, &ti->error);
4029         if (r)
4030                 goto bad;
4031
4032         while (extra_args--) {
4033                 const char *opt_string;
4034                 unsigned val;
4035                 unsigned long long llval;
4036                 opt_string = dm_shift_arg(&as);
4037                 if (!opt_string) {
4038                         r = -EINVAL;
4039                         ti->error = "Not enough feature arguments";
4040                         goto bad;
4041                 }
4042                 if (sscanf(opt_string, "journal_sectors:%u%c", &val, &dummy) == 1)
4043                         journal_sectors = val ? val : 1;
4044                 else if (sscanf(opt_string, "interleave_sectors:%u%c", &val, &dummy) == 1)
4045                         interleave_sectors = val;
4046                 else if (sscanf(opt_string, "buffer_sectors:%u%c", &val, &dummy) == 1)
4047                         buffer_sectors = val;
4048                 else if (sscanf(opt_string, "journal_watermark:%u%c", &val, &dummy) == 1 && val <= 100)
4049                         journal_watermark = val;
4050                 else if (sscanf(opt_string, "commit_time:%u%c", &val, &dummy) == 1)
4051                         sync_msec = val;
4052                 else if (!strncmp(opt_string, "meta_device:", strlen("meta_device:"))) {
4053                         if (ic->meta_dev) {
4054                                 dm_put_device(ti, ic->meta_dev);
4055                                 ic->meta_dev = NULL;
4056                         }
4057                         r = dm_get_device(ti, strchr(opt_string, ':') + 1,
4058                                           dm_table_get_mode(ti->table), &ic->meta_dev);
4059                         if (r) {
4060                                 ti->error = "Device lookup failed";
4061                                 goto bad;
4062                         }
4063                 } else if (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) {
4064                         if (val < 1 << SECTOR_SHIFT ||
4065                             val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT ||
4066                             (val & (val -1))) {
4067                                 r = -EINVAL;
4068                                 ti->error = "Invalid block_size argument";
4069                                 goto bad;
4070                         }
4071                         ic->sectors_per_block = val >> SECTOR_SHIFT;
4072                 } else if (sscanf(opt_string, "sectors_per_bit:%llu%c", &llval, &dummy) == 1) {
4073                         log2_sectors_per_bitmap_bit = !llval ? 0 : __ilog2_u64(llval);
4074                 } else if (sscanf(opt_string, "bitmap_flush_interval:%u%c", &val, &dummy) == 1) {
4075                         if (val >= (uint64_t)UINT_MAX * 1000 / HZ) {
4076                                 r = -EINVAL;
4077                                 ti->error = "Invalid bitmap_flush_interval argument";
4078                                 goto bad;
4079                         }
4080                         ic->bitmap_flush_interval = msecs_to_jiffies(val);
4081                 } else if (!strncmp(opt_string, "internal_hash:", strlen("internal_hash:"))) {
4082                         r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error,
4083                                             "Invalid internal_hash argument");
4084                         if (r)
4085                                 goto bad;
4086                 } else if (!strncmp(opt_string, "journal_crypt:", strlen("journal_crypt:"))) {
4087                         r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error,
4088                                             "Invalid journal_crypt argument");
4089                         if (r)
4090                                 goto bad;
4091                 } else if (!strncmp(opt_string, "journal_mac:", strlen("journal_mac:"))) {
4092                         r = get_alg_and_key(opt_string, &ic->journal_mac_alg, &ti->error,
4093                                             "Invalid journal_mac argument");
4094                         if (r)
4095                                 goto bad;
4096                 } else if (!strcmp(opt_string, "recalculate")) {
4097                         ic->recalculate_flag = true;
4098                 } else if (!strcmp(opt_string, "reset_recalculate")) {
4099                         ic->recalculate_flag = true;
4100                         ic->reset_recalculate_flag = true;
4101                 } else if (!strcmp(opt_string, "allow_discards")) {
4102                         ic->discard = true;
4103                 } else if (!strcmp(opt_string, "fix_padding")) {
4104                         ic->fix_padding = true;
4105                 } else if (!strcmp(opt_string, "fix_hmac")) {
4106                         ic->fix_hmac = true;
4107                 } else if (!strcmp(opt_string, "legacy_recalculate")) {
4108                         ic->legacy_recalculate = true;
4109                 } else {
4110                         r = -EINVAL;
4111                         ti->error = "Invalid argument";
4112                         goto bad;
4113                 }
4114         }
4115
4116         ic->data_device_sectors = i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT;
4117         if (!ic->meta_dev)
4118                 ic->meta_device_sectors = ic->data_device_sectors;
4119         else
4120                 ic->meta_device_sectors = i_size_read(ic->meta_dev->bdev->bd_inode) >> SECTOR_SHIFT;
4121
4122         if (!journal_sectors) {
4123                 journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS,
4124                                       ic->data_device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR);
4125         }
4126
4127         if (!buffer_sectors)
4128                 buffer_sectors = 1;
4129         ic->log2_buffer_sectors = min((int)__fls(buffer_sectors), 31 - SECTOR_SHIFT);
4130
4131         r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error,
4132                     "Invalid internal hash", "Error setting internal hash key");
4133         if (r)
4134                 goto bad;
4135
4136         r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error,
4137                     "Invalid journal mac", "Error setting journal mac key");
4138         if (r)
4139                 goto bad;
4140
4141         if (!ic->tag_size) {
4142                 if (!ic->internal_hash) {
4143                         ti->error = "Unknown tag size";
4144                         r = -EINVAL;
4145                         goto bad;
4146                 }
4147                 ic->tag_size = crypto_shash_digestsize(ic->internal_hash);
4148         }
4149         if (ic->tag_size > MAX_TAG_SIZE) {
4150                 ti->error = "Too big tag size";
4151                 r = -EINVAL;
4152                 goto bad;
4153         }
4154         if (!(ic->tag_size & (ic->tag_size - 1)))
4155                 ic->log2_tag_size = __ffs(ic->tag_size);
4156         else
4157                 ic->log2_tag_size = -1;
4158
4159         if (ic->mode == 'B' && !ic->internal_hash) {
4160                 r = -EINVAL;
4161                 ti->error = "Bitmap mode can be only used with internal hash";
4162                 goto bad;
4163         }
4164
4165         if (ic->discard && !ic->internal_hash) {
4166                 r = -EINVAL;
4167                 ti->error = "Discard can be only used with internal hash";
4168                 goto bad;
4169         }
4170
4171         ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
4172         ic->autocommit_msec = sync_msec;
4173         timer_setup(&ic->autocommit_timer, autocommit_fn, 0);
4174
4175         ic->io = dm_io_client_create();
4176         if (IS_ERR(ic->io)) {
4177                 r = PTR_ERR(ic->io);
4178                 ic->io = NULL;
4179                 ti->error = "Cannot allocate dm io";
4180                 goto bad;
4181         }
4182
4183         r = mempool_init_slab_pool(&ic->journal_io_mempool, JOURNAL_IO_MEMPOOL, journal_io_cache);
4184         if (r) {
4185                 ti->error = "Cannot allocate mempool";
4186                 goto bad;
4187         }
4188
4189         ic->metadata_wq = alloc_workqueue("dm-integrity-metadata",
4190                                           WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE);
4191         if (!ic->metadata_wq) {
4192                 ti->error = "Cannot allocate workqueue";
4193                 r = -ENOMEM;
4194                 goto bad;
4195         }
4196
4197         /*
4198          * If this workqueue were percpu, it would cause bio reordering
4199          * and reduced performance.
4200          */
4201         ic->wait_wq = alloc_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4202         if (!ic->wait_wq) {
4203                 ti->error = "Cannot allocate workqueue";
4204                 r = -ENOMEM;
4205                 goto bad;
4206         }
4207
4208         ic->offload_wq = alloc_workqueue("dm-integrity-offload", WQ_MEM_RECLAIM,
4209                                           METADATA_WORKQUEUE_MAX_ACTIVE);
4210         if (!ic->offload_wq) {
4211                 ti->error = "Cannot allocate workqueue";
4212                 r = -ENOMEM;
4213                 goto bad;
4214         }
4215
4216         ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1);
4217         if (!ic->commit_wq) {
4218                 ti->error = "Cannot allocate workqueue";
4219                 r = -ENOMEM;
4220                 goto bad;
4221         }
4222         INIT_WORK(&ic->commit_work, integrity_commit);
4223
4224         if (ic->mode == 'J' || ic->mode == 'B') {
4225                 ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1);
4226                 if (!ic->writer_wq) {
4227                         ti->error = "Cannot allocate workqueue";
4228                         r = -ENOMEM;
4229                         goto bad;
4230                 }
4231                 INIT_WORK(&ic->writer_work, integrity_writer);
4232         }
4233
4234         ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL);
4235         if (!ic->sb) {
4236                 r = -ENOMEM;
4237                 ti->error = "Cannot allocate superblock area";
4238                 goto bad;
4239         }
4240
4241         r = sync_rw_sb(ic, REQ_OP_READ, 0);
4242         if (r) {
4243                 ti->error = "Error reading superblock";
4244                 goto bad;
4245         }
4246         should_write_sb = false;
4247         if (memcmp(ic->sb->magic, SB_MAGIC, 8)) {
4248                 if (ic->mode != 'R') {
4249                         if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) {
4250                                 r = -EINVAL;
4251                                 ti->error = "The device is not initialized";
4252                                 goto bad;
4253                         }
4254                 }
4255
4256                 r = initialize_superblock(ic, journal_sectors, interleave_sectors);
4257                 if (r) {
4258                         ti->error = "Could not initialize superblock";
4259                         goto bad;
4260                 }
4261                 if (ic->mode != 'R')
4262                         should_write_sb = true;
4263         }
4264
4265         if (!ic->sb->version || ic->sb->version > SB_VERSION_5) {
4266                 r = -EINVAL;
4267                 ti->error = "Unknown version";
4268                 goto bad;
4269         }
4270         if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) {
4271                 r = -EINVAL;
4272                 ti->error = "Tag size doesn't match the information in superblock";
4273                 goto bad;
4274         }
4275         if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) {
4276                 r = -EINVAL;
4277                 ti->error = "Block size doesn't match the information in superblock";
4278                 goto bad;
4279         }
4280         if (!le32_to_cpu(ic->sb->journal_sections)) {
4281                 r = -EINVAL;
4282                 ti->error = "Corrupted superblock, journal_sections is 0";
4283                 goto bad;
4284         }
4285         /* make sure that ti->max_io_len doesn't overflow */
4286         if (!ic->meta_dev) {
4287                 if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS ||
4288                     ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) {
4289                         r = -EINVAL;
4290                         ti->error = "Invalid interleave_sectors in the superblock";
4291                         goto bad;
4292                 }
4293         } else {
4294                 if (ic->sb->log2_interleave_sectors) {
4295                         r = -EINVAL;
4296                         ti->error = "Invalid interleave_sectors in the superblock";
4297                         goto bad;
4298                 }
4299         }
4300         if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
4301                 r = -EINVAL;
4302                 ti->error = "Journal mac mismatch";
4303                 goto bad;
4304         }
4305
4306         get_provided_data_sectors(ic);
4307         if (!ic->provided_data_sectors) {
4308                 r = -EINVAL;
4309                 ti->error = "The device is too small";
4310                 goto bad;
4311         }
4312
4313 try_smaller_buffer:
4314         r = calculate_device_limits(ic);
4315         if (r) {
4316                 if (ic->meta_dev) {
4317                         if (ic->log2_buffer_sectors > 3) {
4318                                 ic->log2_buffer_sectors--;
4319                                 goto try_smaller_buffer;
4320                         }
4321                 }
4322                 ti->error = "The device is too small";
4323                 goto bad;
4324         }
4325
4326         if (log2_sectors_per_bitmap_bit < 0)
4327                 log2_sectors_per_bitmap_bit = __fls(DEFAULT_SECTORS_PER_BITMAP_BIT);
4328         if (log2_sectors_per_bitmap_bit < ic->sb->log2_sectors_per_block)
4329                 log2_sectors_per_bitmap_bit = ic->sb->log2_sectors_per_block;
4330
4331         bits_in_journal = ((__u64)ic->journal_section_sectors * ic->journal_sections) << (SECTOR_SHIFT + 3);
4332         if (bits_in_journal > UINT_MAX)
4333                 bits_in_journal = UINT_MAX;
4334         while (bits_in_journal < (ic->provided_data_sectors + ((sector_t)1 << log2_sectors_per_bitmap_bit) - 1) >> log2_sectors_per_bitmap_bit)
4335                 log2_sectors_per_bitmap_bit++;
4336
4337         log2_blocks_per_bitmap_bit = log2_sectors_per_bitmap_bit - ic->sb->log2_sectors_per_block;
4338         ic->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
4339         if (should_write_sb) {
4340                 ic->sb->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
4341         }
4342         n_bitmap_bits = ((ic->provided_data_sectors >> ic->sb->log2_sectors_per_block)
4343                                 + (((sector_t)1 << log2_blocks_per_bitmap_bit) - 1)) >> log2_blocks_per_bitmap_bit;
4344         ic->n_bitmap_blocks = DIV_ROUND_UP(n_bitmap_bits, BITMAP_BLOCK_SIZE * 8);
4345
4346         if (!ic->meta_dev)
4347                 ic->log2_buffer_sectors = min(ic->log2_buffer_sectors, (__u8)__ffs(ic->metadata_run));
4348
4349         if (ti->len > ic->provided_data_sectors) {
4350                 r = -EINVAL;
4351                 ti->error = "Not enough provided sectors for requested mapping size";
4352                 goto bad;
4353         }
4354
4355
4356         threshold = (__u64)ic->journal_entries * (100 - journal_watermark);
4357         threshold += 50;
4358         do_div(threshold, 100);
4359         ic->free_sectors_threshold = threshold;
4360
4361         DEBUG_print("initialized:\n");
4362         DEBUG_print("   integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size));
4363         DEBUG_print("   journal_entry_size %u\n", ic->journal_entry_size);
4364         DEBUG_print("   journal_entries_per_sector %u\n", ic->journal_entries_per_sector);
4365         DEBUG_print("   journal_section_entries %u\n", ic->journal_section_entries);
4366         DEBUG_print("   journal_section_sectors %u\n", ic->journal_section_sectors);
4367         DEBUG_print("   journal_sections %u\n", (unsigned)le32_to_cpu(ic->sb->journal_sections));
4368         DEBUG_print("   journal_entries %u\n", ic->journal_entries);
4369         DEBUG_print("   log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors);
4370         DEBUG_print("   data_device_sectors 0x%llx\n", i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT);
4371         DEBUG_print("   initial_sectors 0x%x\n", ic->initial_sectors);
4372         DEBUG_print("   metadata_run 0x%x\n", ic->metadata_run);
4373         DEBUG_print("   log2_metadata_run %d\n", ic->log2_metadata_run);
4374         DEBUG_print("   provided_data_sectors 0x%llx (%llu)\n", ic->provided_data_sectors, ic->provided_data_sectors);
4375         DEBUG_print("   log2_buffer_sectors %u\n", ic->log2_buffer_sectors);
4376         DEBUG_print("   bits_in_journal %llu\n", bits_in_journal);
4377
4378         if (ic->recalculate_flag && !(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))) {
4379                 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
4380                 ic->sb->recalc_sector = cpu_to_le64(0);
4381         }
4382
4383         if (ic->internal_hash) {
4384                 ic->recalc_wq = alloc_workqueue("dm-integrity-recalc", WQ_MEM_RECLAIM, 1);
4385                 if (!ic->recalc_wq ) {
4386                         ti->error = "Cannot allocate workqueue";
4387                         r = -ENOMEM;
4388                         goto bad;
4389                 }
4390                 INIT_WORK(&ic->recalc_work, integrity_recalc);
4391                 ic->recalc_buffer = vmalloc(RECALC_SECTORS << SECTOR_SHIFT);
4392                 if (!ic->recalc_buffer) {
4393                         ti->error = "Cannot allocate buffer for recalculating";
4394                         r = -ENOMEM;
4395                         goto bad;
4396                 }
4397                 ic->recalc_tags = kvmalloc_array(RECALC_SECTORS >> ic->sb->log2_sectors_per_block,
4398                                                  ic->tag_size, GFP_KERNEL);
4399                 if (!ic->recalc_tags) {
4400                         ti->error = "Cannot allocate tags for recalculating";
4401                         r = -ENOMEM;
4402                         goto bad;
4403                 }
4404         } else {
4405                 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
4406                         ti->error = "Recalculate can only be specified with internal_hash";
4407                         r = -EINVAL;
4408                         goto bad;
4409                 }
4410         }
4411
4412         if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
4413             le64_to_cpu(ic->sb->recalc_sector) < ic->provided_data_sectors &&
4414             dm_integrity_disable_recalculate(ic)) {
4415                 ti->error = "Recalculating with HMAC is disabled for security reasons - if you really need it, use the argument \"legacy_recalculate\"";
4416                 r = -EOPNOTSUPP;
4417                 goto bad;
4418         }
4419
4420         ic->bufio = dm_bufio_client_create(ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev,
4421                         1U << (SECTOR_SHIFT + ic->log2_buffer_sectors), 1, 0, NULL, NULL);
4422         if (IS_ERR(ic->bufio)) {
4423                 r = PTR_ERR(ic->bufio);
4424                 ti->error = "Cannot initialize dm-bufio";
4425                 ic->bufio = NULL;
4426                 goto bad;
4427         }
4428         dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors);
4429
4430         if (ic->mode != 'R') {
4431                 r = create_journal(ic, &ti->error);
4432                 if (r)
4433                         goto bad;
4434
4435         }
4436
4437         if (ic->mode == 'B') {
4438                 unsigned i;
4439                 unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
4440
4441                 ic->recalc_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4442                 if (!ic->recalc_bitmap) {
4443                         r = -ENOMEM;
4444                         goto bad;
4445                 }
4446                 ic->may_write_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4447                 if (!ic->may_write_bitmap) {
4448                         r = -ENOMEM;
4449                         goto bad;
4450                 }
4451                 ic->bbs = kvmalloc_array(ic->n_bitmap_blocks, sizeof(struct bitmap_block_status), GFP_KERNEL);
4452                 if (!ic->bbs) {
4453                         r = -ENOMEM;
4454                         goto bad;
4455                 }
4456                 INIT_DELAYED_WORK(&ic->bitmap_flush_work, bitmap_flush_work);
4457                 for (i = 0; i < ic->n_bitmap_blocks; i++) {
4458                         struct bitmap_block_status *bbs = &ic->bbs[i];
4459                         unsigned sector, pl_index, pl_offset;
4460
4461                         INIT_WORK(&bbs->work, bitmap_block_work);
4462                         bbs->ic = ic;
4463                         bbs->idx = i;
4464                         bio_list_init(&bbs->bio_queue);
4465                         spin_lock_init(&bbs->bio_queue_lock);
4466
4467                         sector = i * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT);
4468                         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
4469                         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
4470
4471                         bbs->bitmap = lowmem_page_address(ic->journal[pl_index].page) + pl_offset;
4472                 }
4473         }
4474
4475         if (should_write_sb) {
4476                 int r;
4477
4478                 init_journal(ic, 0, ic->journal_sections, 0);
4479                 r = dm_integrity_failed(ic);
4480                 if (unlikely(r)) {
4481                         ti->error = "Error initializing journal";
4482                         goto bad;
4483                 }
4484                 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
4485                 if (r) {
4486                         ti->error = "Error initializing superblock";
4487                         goto bad;
4488                 }
4489                 ic->just_formatted = true;
4490         }
4491
4492         if (!ic->meta_dev) {
4493                 r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors);
4494                 if (r)
4495                         goto bad;
4496         }
4497         if (ic->mode == 'B') {
4498                 unsigned max_io_len = ((sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit) * (BITMAP_BLOCK_SIZE * 8);
4499                 if (!max_io_len)
4500                         max_io_len = 1U << 31;
4501                 DEBUG_print("max_io_len: old %u, new %u\n", ti->max_io_len, max_io_len);
4502                 if (!ti->max_io_len || ti->max_io_len > max_io_len) {
4503                         r = dm_set_target_max_io_len(ti, max_io_len);
4504                         if (r)
4505                                 goto bad;
4506                 }
4507         }
4508
4509         if (!ic->internal_hash)
4510                 dm_integrity_set(ti, ic);
4511
4512         ti->num_flush_bios = 1;
4513         ti->flush_supported = true;
4514         if (ic->discard)
4515                 ti->num_discard_bios = 1;
4516
4517         return 0;
4518
4519 bad:
4520         dm_integrity_dtr(ti);
4521         return r;
4522 }
4523
4524 static void dm_integrity_dtr(struct dm_target *ti)
4525 {
4526         struct dm_integrity_c *ic = ti->private;
4527
4528         BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
4529         BUG_ON(!list_empty(&ic->wait_list));
4530
4531         if (ic->metadata_wq)
4532                 destroy_workqueue(ic->metadata_wq);
4533         if (ic->wait_wq)
4534                 destroy_workqueue(ic->wait_wq);
4535         if (ic->offload_wq)
4536                 destroy_workqueue(ic->offload_wq);
4537         if (ic->commit_wq)
4538                 destroy_workqueue(ic->commit_wq);
4539         if (ic->writer_wq)
4540                 destroy_workqueue(ic->writer_wq);
4541         if (ic->recalc_wq)
4542                 destroy_workqueue(ic->recalc_wq);
4543         vfree(ic->recalc_buffer);
4544         kvfree(ic->recalc_tags);
4545         kvfree(ic->bbs);
4546         if (ic->bufio)
4547                 dm_bufio_client_destroy(ic->bufio);
4548         mempool_exit(&ic->journal_io_mempool);
4549         if (ic->io)
4550                 dm_io_client_destroy(ic->io);
4551         if (ic->dev)
4552                 dm_put_device(ti, ic->dev);
4553         if (ic->meta_dev)
4554                 dm_put_device(ti, ic->meta_dev);
4555         dm_integrity_free_page_list(ic->journal);
4556         dm_integrity_free_page_list(ic->journal_io);
4557         dm_integrity_free_page_list(ic->journal_xor);
4558         dm_integrity_free_page_list(ic->recalc_bitmap);
4559         dm_integrity_free_page_list(ic->may_write_bitmap);
4560         if (ic->journal_scatterlist)
4561                 dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist);
4562         if (ic->journal_io_scatterlist)
4563                 dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist);
4564         if (ic->sk_requests) {
4565                 unsigned i;
4566
4567                 for (i = 0; i < ic->journal_sections; i++) {
4568                         struct skcipher_request *req = ic->sk_requests[i];
4569                         if (req) {
4570                                 kfree_sensitive(req->iv);
4571                                 skcipher_request_free(req);
4572                         }
4573                 }
4574                 kvfree(ic->sk_requests);
4575         }
4576         kvfree(ic->journal_tree);
4577         if (ic->sb)
4578                 free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT);
4579
4580         if (ic->internal_hash)
4581                 crypto_free_shash(ic->internal_hash);
4582         free_alg(&ic->internal_hash_alg);
4583
4584         if (ic->journal_crypt)
4585                 crypto_free_skcipher(ic->journal_crypt);
4586         free_alg(&ic->journal_crypt_alg);
4587
4588         if (ic->journal_mac)
4589                 crypto_free_shash(ic->journal_mac);
4590         free_alg(&ic->journal_mac_alg);
4591
4592         kfree(ic);
4593 }
4594
4595 static struct target_type integrity_target = {
4596         .name                   = "integrity",
4597         .version                = {1, 10, 0},
4598         .module                 = THIS_MODULE,
4599         .features               = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
4600         .ctr                    = dm_integrity_ctr,
4601         .dtr                    = dm_integrity_dtr,
4602         .map                    = dm_integrity_map,
4603         .postsuspend            = dm_integrity_postsuspend,
4604         .resume                 = dm_integrity_resume,
4605         .status                 = dm_integrity_status,
4606         .iterate_devices        = dm_integrity_iterate_devices,
4607         .io_hints               = dm_integrity_io_hints,
4608 };
4609
4610 static int __init dm_integrity_init(void)
4611 {
4612         int r;
4613
4614         journal_io_cache = kmem_cache_create("integrity_journal_io",
4615                                              sizeof(struct journal_io), 0, 0, NULL);
4616         if (!journal_io_cache) {
4617                 DMERR("can't allocate journal io cache");
4618                 return -ENOMEM;
4619         }
4620
4621         r = dm_register_target(&integrity_target);
4622
4623         if (r < 0)
4624                 DMERR("register failed %d", r);
4625
4626         return r;
4627 }
4628
4629 static void __exit dm_integrity_exit(void)
4630 {
4631         dm_unregister_target(&integrity_target);
4632         kmem_cache_destroy(journal_io_cache);
4633 }
4634
4635 module_init(dm_integrity_init);
4636 module_exit(dm_integrity_exit);
4637
4638 MODULE_AUTHOR("Milan Broz");
4639 MODULE_AUTHOR("Mikulas Patocka");
4640 MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension");
4641 MODULE_LICENSE("GPL");