drivers/md/dm-integrity.c

   1 /*
   2  * Copyright (C) 2016-2017 Red Hat, Inc. All rights reserved.
   3  * Copyright (C) 2016-2017 Milan Broz
   4  * Copyright (C) 2016-2017 Mikulas Patocka
   5  *
   6  * This file is released under the GPL.
   7  */
   8
   9 #include <linux/compiler.h>
  10 #include <linux/module.h>
  11 #include <linux/device-mapper.h>
  12 #include <linux/dm-io.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/sort.h>
  15 #include <linux/rbtree.h>
  16 #include <linux/delay.h>
  17 #include <linux/random.h>
  18 #include <linux/reboot.h>
  19 #include <crypto/hash.h>
  20 #include <crypto/skcipher.h>
  21 #include <linux/async_tx.h>
  22 #include <linux/dm-bufio.h>
  23
  24 #define DM_MSG_PREFIX "integrity"
  25
  26 #define DEFAULT_INTERLEAVE_SECTORS      32768
  27 #define DEFAULT_JOURNAL_SIZE_FACTOR     7
  28 #define DEFAULT_SECTORS_PER_BITMAP_BIT  32768
  29 #define DEFAULT_BUFFER_SECTORS          128
  30 #define DEFAULT_JOURNAL_WATERMARK       50
  31 #define DEFAULT_SYNC_MSEC               10000
  32 #define DEFAULT_MAX_JOURNAL_SECTORS     131072
  33 #define MIN_LOG2_INTERLEAVE_SECTORS     3
  34 #define MAX_LOG2_INTERLEAVE_SECTORS     31
  35 #define METADATA_WORKQUEUE_MAX_ACTIVE   16
  36 #define RECALC_SECTORS                  8192
  37 #define RECALC_WRITE_SUPER              16
  38 #define BITMAP_BLOCK_SIZE               4096    /* don't change it */
  39 #define BITMAP_FLUSH_INTERVAL           (10 * HZ)
  40
  41 /*
  42  * Warning - DEBUG_PRINT prints security-sensitive data to the log,
  43  * so it should not be enabled in the official kernel
  44  */
  45 //#define DEBUG_PRINT
  46 //#define INTERNAL_VERIFY
  47
  48 /*
  49  * On disk structures
  50  */
  51
  52 #define SB_MAGIC                        "integrt"
  53 #define SB_VERSION_1                    1
  54 #define SB_VERSION_2                    2
  55 #define SB_VERSION_3                    3
  56 #define SB_SECTORS                      8
  57 #define MAX_SECTORS_PER_BLOCK           8
  58
  59 struct superblock {
  60         __u8 magic[8];
  61         __u8 version;
  62         __u8 log2_interleave_sectors;
  63         __u16 integrity_tag_size;
  64         __u32 journal_sections;
  65         __u64 provided_data_sectors;    /* userspace uses this value */
  66         __u32 flags;
  67         __u8 log2_sectors_per_block;
  68         __u8 log2_blocks_per_bitmap_bit;
  69         __u8 pad[2];
  70         __u64 recalc_sector;
  71 };
  72
  73 #define SB_FLAG_HAVE_JOURNAL_MAC        0x1
  74 #define SB_FLAG_RECALCULATING           0x2
  75 #define SB_FLAG_DIRTY_BITMAP            0x4
  76
  77 #define JOURNAL_ENTRY_ROUNDUP           8
  78
  79 typedef __u64 commit_id_t;
  80 #define JOURNAL_MAC_PER_SECTOR          8
  81
  82 struct journal_entry {
  83         union {
  84                 struct {
  85                         __u32 sector_lo;
  86                         __u32 sector_hi;
  87                 } s;
  88                 __u64 sector;
  89         } u;
  90         commit_id_t last_bytes[0];
  91         /* __u8 tag[0]; */
  92 };
  93
  94 #define journal_entry_tag(ic, je)               ((__u8 *)&(je)->last_bytes[(ic)->sectors_per_block])
  95
  96 #if BITS_PER_LONG == 64
  97 #define journal_entry_set_sector(je, x)         do { smp_wmb(); WRITE_ONCE((je)->u.sector, cpu_to_le64(x)); } while (0)
  98 #else
  99 #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)
 100 #endif
 101 #define journal_entry_get_sector(je)            le64_to_cpu((je)->u.sector)
 102 #define journal_entry_is_unused(je)             ((je)->u.s.sector_hi == cpu_to_le32(-1))
 103 #define journal_entry_set_unused(je)            do { ((je)->u.s.sector_hi = cpu_to_le32(-1)); } while (0)
 104 #define journal_entry_is_inprogress(je)         ((je)->u.s.sector_hi == cpu_to_le32(-2))
 105 #define journal_entry_set_inprogress(je)        do { ((je)->u.s.sector_hi = cpu_to_le32(-2)); } while (0)
 106
 107 #define JOURNAL_BLOCK_SECTORS           8
 108 #define JOURNAL_SECTOR_DATA             ((1 << SECTOR_SHIFT) - sizeof(commit_id_t))
 109 #define JOURNAL_MAC_SIZE                (JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS)
 110
 111 struct journal_sector {
 112         __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR];
 113         __u8 mac[JOURNAL_MAC_PER_SECTOR];
 114         commit_id_t commit_id;
 115 };
 116
 117 #define MAX_TAG_SIZE                    (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
 118
 119 #define METADATA_PADDING_SECTORS        8
 120
 121 #define N_COMMIT_IDS                    4
 122
 123 static unsigned char prev_commit_seq(unsigned char seq)
 124 {
 125         return (seq + N_COMMIT_IDS - 1) % N_COMMIT_IDS;
 126 }
 127
 128 static unsigned char next_commit_seq(unsigned char seq)
 129 {
 130         return (seq + 1) % N_COMMIT_IDS;
 131 }
 132
 133 /*
 134  * In-memory structures
 135  */
 136
 137 struct journal_node {
 138         struct rb_node node;
 139         sector_t sector;
 140 };
 141
 142 struct alg_spec {
 143         char *alg_string;
 144         char *key_string;
 145         __u8 *key;
 146         unsigned key_size;
 147 };
 148
 149 struct dm_integrity_c {
 150         struct dm_dev *dev;
 151         struct dm_dev *meta_dev;
 152         unsigned tag_size;
 153         __s8 log2_tag_size;
 154         sector_t start;
 155         mempool_t journal_io_mempool;
 156         struct dm_io_client *io;
 157         struct dm_bufio_client *bufio;
 158         struct workqueue_struct *metadata_wq;
 159         struct superblock *sb;
 160         unsigned journal_pages;
 161         unsigned n_bitmap_blocks;
 162
 163         struct page_list *journal;
 164         struct page_list *journal_io;
 165         struct page_list *journal_xor;
 166         struct page_list *recalc_bitmap;
 167         struct page_list *may_write_bitmap;
 168         struct bitmap_block_status *bbs;
 169         unsigned bitmap_flush_interval;
 170         int synchronous_mode;
 171         struct bio_list synchronous_bios;
 172         struct delayed_work bitmap_flush_work;
 173
 174         struct crypto_skcipher *journal_crypt;
 175         struct scatterlist **journal_scatterlist;
 176         struct scatterlist **journal_io_scatterlist;
 177         struct skcipher_request **sk_requests;
 178
 179         struct crypto_shash *journal_mac;
 180
 181         struct journal_node *journal_tree;
 182         struct rb_root journal_tree_root;
 183
 184         sector_t provided_data_sectors;
 185
 186         unsigned short journal_entry_size;
 187         unsigned char journal_entries_per_sector;
 188         unsigned char journal_section_entries;
 189         unsigned short journal_section_sectors;
 190         unsigned journal_sections;
 191         unsigned journal_entries;
 192         sector_t data_device_sectors;
 193         sector_t meta_device_sectors;
 194         unsigned initial_sectors;
 195         unsigned metadata_run;
 196         __s8 log2_metadata_run;
 197         __u8 log2_buffer_sectors;
 198         __u8 sectors_per_block;
 199         __u8 log2_blocks_per_bitmap_bit;
 200
 201         unsigned char mode;
 202         int suspending;
 203
 204         int failed;
 205
 206         struct crypto_shash *internal_hash;
 207
 208         /* these variables are locked with endio_wait.lock */
 209         struct rb_root in_progress;
 210         struct list_head wait_list;
 211         wait_queue_head_t endio_wait;
 212         struct workqueue_struct *wait_wq;
 213
 214         unsigned char commit_seq;
 215         commit_id_t commit_ids[N_COMMIT_IDS];
 216
 217         unsigned committed_section;
 218         unsigned n_committed_sections;
 219
 220         unsigned uncommitted_section;
 221         unsigned n_uncommitted_sections;
 222
 223         unsigned free_section;
 224         unsigned char free_section_entry;
 225         unsigned free_sectors;
 226
 227         unsigned free_sectors_threshold;
 228
 229         struct workqueue_struct *commit_wq;
 230         struct work_struct commit_work;
 231
 232         struct workqueue_struct *writer_wq;
 233         struct work_struct writer_work;
 234
 235         struct workqueue_struct *recalc_wq;
 236         struct work_struct recalc_work;
 237         u8 *recalc_buffer;
 238         u8 *recalc_tags;
 239
 240         struct bio_list flush_bio_list;
 241
 242         unsigned long autocommit_jiffies;
 243         struct timer_list autocommit_timer;
 244         unsigned autocommit_msec;
 245
 246         wait_queue_head_t copy_to_journal_wait;
 247
 248         struct completion crypto_backoff;
 249
 250         bool journal_uptodate;
 251         bool just_formatted;
 252         bool recalculate_flag;
 253
 254         struct alg_spec internal_hash_alg;
 255         struct alg_spec journal_crypt_alg;
 256         struct alg_spec journal_mac_alg;
 257
 258         atomic64_t number_of_mismatches;
 259
 260         struct notifier_block reboot_notifier;
 261 };
 262
 263 struct dm_integrity_range {
 264         sector_t logical_sector;
 265         sector_t n_sectors;
 266         bool waiting;
 267         union {
 268                 struct rb_node node;
 269                 struct {
 270                         struct task_struct *task;
 271                         struct list_head wait_entry;
 272                 };
 273         };
 274 };
 275
 276 struct dm_integrity_io {
 277         struct work_struct work;
 278
 279         struct dm_integrity_c *ic;
 280         bool write;
 281         bool fua;
 282
 283         struct dm_integrity_range range;
 284
 285         sector_t metadata_block;
 286         unsigned metadata_offset;
 287
 288         atomic_t in_flight;
 289         blk_status_t bi_status;
 290
 291         struct completion *completion;
 292
 293         struct gendisk *orig_bi_disk;
 294         u8 orig_bi_partno;
 295         bio_end_io_t *orig_bi_end_io;
 296         struct bio_integrity_payload *orig_bi_integrity;
 297         struct bvec_iter orig_bi_iter;
 298 };
 299
 300 struct journal_completion {
 301         struct dm_integrity_c *ic;
 302         atomic_t in_flight;
 303         struct completion comp;
 304 };
 305
 306 struct journal_io {
 307         struct dm_integrity_range range;
 308         struct journal_completion *comp;
 309 };
 310
 311 struct bitmap_block_status {
 312         struct work_struct work;
 313         struct dm_integrity_c *ic;
 314         unsigned idx;
 315         unsigned long *bitmap;
 316         struct bio_list bio_queue;
 317         spinlock_t bio_queue_lock;
 318
 319 };
 320
 321 static struct kmem_cache *journal_io_cache;
 322
 323 #define JOURNAL_IO_MEMPOOL      32
 324
 325 #ifdef DEBUG_PRINT
 326 #define DEBUG_print(x, ...)     printk(KERN_DEBUG x, ##__VA_ARGS__)
 327 static void __DEBUG_bytes(__u8 *bytes, size_t len, const char *msg, ...)
 328 {
 329         va_list args;
 330         va_start(args, msg);
 331         vprintk(msg, args);
 332         va_end(args);
 333         if (len)
 334                 pr_cont(":");
 335         while (len) {
 336                 pr_cont(" %02x", *bytes);
 337                 bytes++;
 338                 len--;
 339         }
 340         pr_cont("\n");
 341 }
 342 #define DEBUG_bytes(bytes, len, msg, ...)       __DEBUG_bytes(bytes, len, KERN_DEBUG msg, ##__VA_ARGS__)
 343 #else
 344 #define DEBUG_print(x, ...)                     do { } while (0)
 345 #define DEBUG_bytes(bytes, len, msg, ...)       do { } while (0)
 346 #endif
 347
 348 /*
 349  * DM Integrity profile, protection is performed layer above (dm-crypt)
 350  */
 351 static const struct blk_integrity_profile dm_integrity_profile = {
 352         .name                   = "DM-DIF-EXT-TAG",
 353         .generate_fn            = NULL,
 354         .verify_fn              = NULL,
 355 };
 356
 357 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map);
 358 static void integrity_bio_wait(struct work_struct *w);
 359 static void dm_integrity_dtr(struct dm_target *ti);
 360
 361 static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err)
 362 {
 363         if (err == -EILSEQ)
 364                 atomic64_inc(&ic->number_of_mismatches);
 365         if (!cmpxchg(&ic->failed, 0, err))
 366                 DMERR("Error on %s: %d", msg, err);
 367 }
 368
 369 static int dm_integrity_failed(struct dm_integrity_c *ic)
 370 {
 371         return READ_ONCE(ic->failed);
 372 }
 373
 374 static commit_id_t dm_integrity_commit_id(struct dm_integrity_c *ic, unsigned i,
 375                                           unsigned j, unsigned char seq)
 376 {
 377         /*
 378          * Xor the number with section and sector, so that if a piece of
 379          * journal is written at wrong place, it is detected.
 380          */
 381         return ic->commit_ids[seq] ^ cpu_to_le64(((__u64)i << 32) ^ j);
 382 }
 383
 384 static void get_area_and_offset(struct dm_integrity_c *ic, sector_t data_sector,
 385                                 sector_t *area, sector_t *offset)
 386 {
 387         if (!ic->meta_dev) {
 388                 __u8 log2_interleave_sectors = ic->sb->log2_interleave_sectors;
 389                 *area = data_sector >> log2_interleave_sectors;
 390                 *offset = (unsigned)data_sector & ((1U << log2_interleave_sectors) - 1);
 391         } else {
 392                 *area = 0;
 393                 *offset = data_sector;
 394         }
 395 }
 396
 397 #define sector_to_block(ic, n)                                          \
 398 do {                                                                    \
 399         BUG_ON((n) & (unsigned)((ic)->sectors_per_block - 1));          \
 400         (n) >>= (ic)->sb->log2_sectors_per_block;                       \
 401 } while (0)
 402
 403 static __u64 get_metadata_sector_and_offset(struct dm_integrity_c *ic, sector_t area,
 404                                             sector_t offset, unsigned *metadata_offset)
 405 {
 406         __u64 ms;
 407         unsigned mo;
 408
 409         ms = area << ic->sb->log2_interleave_sectors;
 410         if (likely(ic->log2_metadata_run >= 0))
 411                 ms += area << ic->log2_metadata_run;
 412         else
 413                 ms += area * ic->metadata_run;
 414         ms >>= ic->log2_buffer_sectors;
 415
 416         sector_to_block(ic, offset);
 417
 418         if (likely(ic->log2_tag_size >= 0)) {
 419                 ms += offset >> (SECTOR_SHIFT + ic->log2_buffer_sectors - ic->log2_tag_size);
 420                 mo = (offset << ic->log2_tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
 421         } else {
 422                 ms += (__u64)offset * ic->tag_size >> (SECTOR_SHIFT + ic->log2_buffer_sectors);
 423                 mo = (offset * ic->tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
 424         }
 425         *metadata_offset = mo;
 426         return ms;
 427 }
 428
 429 static sector_t get_data_sector(struct dm_integrity_c *ic, sector_t area, sector_t offset)
 430 {
 431         sector_t result;
 432
 433         if (ic->meta_dev)
 434                 return offset;
 435
 436         result = area << ic->sb->log2_interleave_sectors;
 437         if (likely(ic->log2_metadata_run >= 0))
 438                 result += (area + 1) << ic->log2_metadata_run;
 439         else
 440                 result += (area + 1) * ic->metadata_run;
 441
 442         result += (sector_t)ic->initial_sectors + offset;
 443         result += ic->start;
 444
 445         return result;
 446 }
 447
 448 static void wraparound_section(struct dm_integrity_c *ic, unsigned *sec_ptr)
 449 {
 450         if (unlikely(*sec_ptr >= ic->journal_sections))
 451                 *sec_ptr -= ic->journal_sections;
 452 }
 453
 454 static void sb_set_version(struct dm_integrity_c *ic)
 455 {
 456         if (ic->mode == 'B' || ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP))
 457                 ic->sb->version = SB_VERSION_3;
 458         else if (ic->meta_dev || ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
 459                 ic->sb->version = SB_VERSION_2;
 460         else
 461                 ic->sb->version = SB_VERSION_1;
 462 }
 463
 464 static int sync_rw_sb(struct dm_integrity_c *ic, int op, int op_flags)
 465 {
 466         struct dm_io_request io_req;
 467         struct dm_io_region io_loc;
 468
 469         io_req.bi_op = op;
 470         io_req.bi_op_flags = op_flags;
 471         io_req.mem.type = DM_IO_KMEM;
 472         io_req.mem.ptr.addr = ic->sb;
 473         io_req.notify.fn = NULL;
 474         io_req.client = ic->io;
 475         io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
 476         io_loc.sector = ic->start;
 477         io_loc.count = SB_SECTORS;
 478
 479         if (op == REQ_OP_WRITE)
 480                 sb_set_version(ic);
 481
 482         return dm_io(&io_req, 1, &io_loc, NULL);
 483 }
 484
 485 #define BITMAP_OP_TEST_ALL_SET          0
 486 #define BITMAP_OP_TEST_ALL_CLEAR        1
 487 #define BITMAP_OP_SET                   2
 488 #define BITMAP_OP_CLEAR                 3
 489
 490 static bool block_bitmap_op(struct dm_integrity_c *ic, struct page_list *bitmap,
 491                             sector_t sector, sector_t n_sectors, int mode)
 492 {
 493         unsigned long bit, end_bit, this_end_bit, page, end_page;
 494         unsigned long *data;
 495
 496         if (unlikely(((sector | n_sectors) & ((1 << ic->sb->log2_sectors_per_block) - 1)) != 0)) {
 497                 DMCRIT("invalid bitmap access (%llx,%llx,%d,%d,%d)",
 498                         (unsigned long long)sector,
 499                         (unsigned long long)n_sectors,
 500                         ic->sb->log2_sectors_per_block,
 501                         ic->log2_blocks_per_bitmap_bit,
 502                         mode);
 503                 BUG();
 504         }
 505
 506         if (unlikely(!n_sectors))
 507                 return true;
 508
 509         bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 510         end_bit = (sector + n_sectors - 1) >>
 511                 (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 512
 513         page = bit / (PAGE_SIZE * 8);
 514         bit %= PAGE_SIZE * 8;
 515
 516         end_page = end_bit / (PAGE_SIZE * 8);
 517         end_bit %= PAGE_SIZE * 8;
 518
 519 repeat:
 520         if (page < end_page) {
 521                 this_end_bit = PAGE_SIZE * 8 - 1;
 522         } else {
 523                 this_end_bit = end_bit;
 524         }
 525
 526         data = lowmem_page_address(bitmap[page].page);
 527
 528         if (mode == BITMAP_OP_TEST_ALL_SET) {
 529                 while (bit <= this_end_bit) {
 530                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 531                                 do {
 532                                         if (data[bit / BITS_PER_LONG] != -1)
 533                                                 return false;
 534                                         bit += BITS_PER_LONG;
 535                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 536                                 continue;
 537                         }
 538                         if (!test_bit(bit, data))
 539                                 return false;
 540                         bit++;
 541                 }
 542         } else if (mode == BITMAP_OP_TEST_ALL_CLEAR) {
 543                 while (bit <= this_end_bit) {
 544                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 545                                 do {
 546                                         if (data[bit / BITS_PER_LONG] != 0)
 547                                                 return false;
 548                                         bit += BITS_PER_LONG;
 549                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 550                                 continue;
 551                         }
 552                         if (test_bit(bit, data))
 553                                 return false;
 554                         bit++;
 555                 }
 556         } else if (mode == BITMAP_OP_SET) {
 557                 while (bit <= this_end_bit) {
 558                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 559                                 do {
 560                                         data[bit / BITS_PER_LONG] = -1;
 561                                         bit += BITS_PER_LONG;
 562                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 563                                 continue;
 564                         }
 565                         __set_bit(bit, data);
 566                         bit++;
 567                 }
 568         } else if (mode == BITMAP_OP_CLEAR) {
 569                 if (!bit && this_end_bit == PAGE_SIZE * 8 - 1)
 570                         clear_page(data);
 571                 else while (bit <= this_end_bit) {
 572                         if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 573                                 do {
 574                                         data[bit / BITS_PER_LONG] = 0;
 575                                         bit += BITS_PER_LONG;
 576                                 } while (this_end_bit >= bit + BITS_PER_LONG - 1);
 577                                 continue;
 578                         }
 579                         __clear_bit(bit, data);
 580                         bit++;
 581                 }
 582         } else {
 583                 BUG();
 584         }
 585
 586         if (unlikely(page < end_page)) {
 587                 bit = 0;
 588                 page++;
 589                 goto repeat;
 590         }
 591
 592         return true;
 593 }
 594
 595 static void block_bitmap_copy(struct dm_integrity_c *ic, struct page_list *dst, struct page_list *src)
 596 {
 597         unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
 598         unsigned i;
 599
 600         for (i = 0; i < n_bitmap_pages; i++) {
 601                 unsigned long *dst_data = lowmem_page_address(dst[i].page);
 602                 unsigned long *src_data = lowmem_page_address(src[i].page);
 603                 copy_page(dst_data, src_data);
 604         }
 605 }
 606
 607 static struct bitmap_block_status *sector_to_bitmap_block(struct dm_integrity_c *ic, sector_t sector)
 608 {
 609         unsigned bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 610         unsigned bitmap_block = bit / (BITMAP_BLOCK_SIZE * 8);
 611
 612         BUG_ON(bitmap_block >= ic->n_bitmap_blocks);
 613         return &ic->bbs[bitmap_block];
 614 }
 615
 616 static void access_journal_check(struct dm_integrity_c *ic, unsigned section, unsigned offset,
 617                                  bool e, const char *function)
 618 {
 619 #if defined(CONFIG_DM_DEBUG) || defined(INTERNAL_VERIFY)
 620         unsigned limit = e ? ic->journal_section_entries : ic->journal_section_sectors;
 621
 622         if (unlikely(section >= ic->journal_sections) ||
 623             unlikely(offset >= limit)) {
 624                 DMCRIT("%s: invalid access at (%u,%u), limit (%u,%u)",
 625                        function, section, offset, ic->journal_sections, limit);
 626                 BUG();
 627         }
 628 #endif
 629 }
 630
 631 static void page_list_location(struct dm_integrity_c *ic, unsigned section, unsigned offset,
 632                                unsigned *pl_index, unsigned *pl_offset)
 633 {
 634         unsigned sector;
 635
 636         access_journal_check(ic, section, offset, false, "page_list_location");
 637
 638         sector = section * ic->journal_section_sectors + offset;
 639
 640         *pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
 641         *pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
 642 }
 643
 644 static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl,
 645                                                unsigned section, unsigned offset, unsigned *n_sectors)
 646 {
 647         unsigned pl_index, pl_offset;
 648         char *va;
 649
 650         page_list_location(ic, section, offset, &pl_index, &pl_offset);
 651
 652         if (n_sectors)
 653                 *n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT;
 654
 655         va = lowmem_page_address(pl[pl_index].page);
 656
 657         return (struct journal_sector *)(va + pl_offset);
 658 }
 659
 660 static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset)
 661 {
 662         return access_page_list(ic, ic->journal, section, offset, NULL);
 663 }
 664
 665 static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned section, unsigned n)
 666 {
 667         unsigned rel_sector, offset;
 668         struct journal_sector *js;
 669
 670         access_journal_check(ic, section, n, true, "access_journal_entry");
 671
 672         rel_sector = n % JOURNAL_BLOCK_SECTORS;
 673         offset = n / JOURNAL_BLOCK_SECTORS;
 674
 675         js = access_journal(ic, section, rel_sector);
 676         return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size);
 677 }
 678
 679 static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned section, unsigned n)
 680 {
 681         n <<= ic->sb->log2_sectors_per_block;
 682
 683         n += JOURNAL_BLOCK_SECTORS;
 684
 685         access_journal_check(ic, section, n, false, "access_journal_data");
 686
 687         return access_journal(ic, section, n);
 688 }
 689
 690 static void section_mac(struct dm_integrity_c *ic, unsigned section, __u8 result[JOURNAL_MAC_SIZE])
 691 {
 692         SHASH_DESC_ON_STACK(desc, ic->journal_mac);
 693         int r;
 694         unsigned j, size;
 695
 696         desc->tfm = ic->journal_mac;
 697
 698         r = crypto_shash_init(desc);
 699         if (unlikely(r)) {
 700                 dm_integrity_io_error(ic, "crypto_shash_init", r);
 701                 goto err;
 702         }
 703
 704         for (j = 0; j < ic->journal_section_entries; j++) {
 705                 struct journal_entry *je = access_journal_entry(ic, section, j);
 706                 r = crypto_shash_update(desc, (__u8 *)&je->u.sector, sizeof je->u.sector);
 707                 if (unlikely(r)) {
 708                         dm_integrity_io_error(ic, "crypto_shash_update", r);
 709                         goto err;
 710                 }
 711         }
 712
 713         size = crypto_shash_digestsize(ic->journal_mac);
 714
 715         if (likely(size <= JOURNAL_MAC_SIZE)) {
 716                 r = crypto_shash_final(desc, result);
 717                 if (unlikely(r)) {
 718                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 719                         goto err;
 720                 }
 721                 memset(result + size, 0, JOURNAL_MAC_SIZE - size);
 722         } else {
 723                 __u8 digest[HASH_MAX_DIGESTSIZE];
 724
 725                 if (WARN_ON(size > sizeof(digest))) {
 726                         dm_integrity_io_error(ic, "digest_size", -EINVAL);
 727                         goto err;
 728                 }
 729                 r = crypto_shash_final(desc, digest);
 730                 if (unlikely(r)) {
 731                         dm_integrity_io_error(ic, "crypto_shash_final", r);
 732                         goto err;
 733                 }
 734                 memcpy(result, digest, JOURNAL_MAC_SIZE);
 735         }
 736
 737         return;
 738 err:
 739         memset(result, 0, JOURNAL_MAC_SIZE);
 740 }
 741
 742 static void rw_section_mac(struct dm_integrity_c *ic, unsigned section, bool wr)
 743 {
 744         __u8 result[JOURNAL_MAC_SIZE];
 745         unsigned j;
 746
 747         if (!ic->journal_mac)
 748                 return;
 749
 750         section_mac(ic, section, result);
 751
 752         for (j = 0; j < JOURNAL_BLOCK_SECTORS; j++) {
 753                 struct journal_sector *js = access_journal(ic, section, j);
 754
 755                 if (likely(wr))
 756                         memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR);
 757                 else {
 758                         if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR))
 759                                 dm_integrity_io_error(ic, "journal mac", -EILSEQ);
 760                 }
 761         }
 762 }
 763
 764 static void complete_journal_op(void *context)
 765 {
 766         struct journal_completion *comp = context;
 767         BUG_ON(!atomic_read(&comp->in_flight));
 768         if (likely(atomic_dec_and_test(&comp->in_flight)))
 769                 complete(&comp->comp);
 770 }
 771
 772 static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
 773                         unsigned n_sections, struct journal_completion *comp)
 774 {
 775         struct async_submit_ctl submit;
 776         size_t n_bytes = (size_t)(n_sections * ic->journal_section_sectors) << SECTOR_SHIFT;
 777         unsigned pl_index, pl_offset, section_index;
 778         struct page_list *source_pl, *target_pl;
 779
 780         if (likely(encrypt)) {
 781                 source_pl = ic->journal;
 782                 target_pl = ic->journal_io;
 783         } else {
 784                 source_pl = ic->journal_io;
 785                 target_pl = ic->journal;
 786         }
 787
 788         page_list_location(ic, section, 0, &pl_index, &pl_offset);
 789
 790         atomic_add(roundup(pl_offset + n_bytes, PAGE_SIZE) >> PAGE_SHIFT, &comp->in_flight);
 791
 792         init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, complete_journal_op, comp, NULL);
 793
 794         section_index = pl_index;
 795
 796         do {
 797                 size_t this_step;
 798                 struct page *src_pages[2];
 799                 struct page *dst_page;
 800
 801                 while (unlikely(pl_index == section_index)) {
 802                         unsigned dummy;
 803                         if (likely(encrypt))
 804                                 rw_section_mac(ic, section, true);
 805                         section++;
 806                         n_sections--;
 807                         if (!n_sections)
 808                                 break;
 809                         page_list_location(ic, section, 0, &section_index, &dummy);
 810                 }
 811
 812                 this_step = min(n_bytes, (size_t)PAGE_SIZE - pl_offset);
 813                 dst_page = target_pl[pl_index].page;
 814                 src_pages[0] = source_pl[pl_index].page;
 815                 src_pages[1] = ic->journal_xor[pl_index].page;
 816
 817                 async_xor(dst_page, src_pages, pl_offset, 2, this_step, &submit);
 818
 819                 pl_index++;
 820                 pl_offset = 0;
 821                 n_bytes -= this_step;
 822         } while (n_bytes);
 823
 824         BUG_ON(n_sections);
 825
 826         async_tx_issue_pending_all();
 827 }
 828
 829 static void complete_journal_encrypt(struct crypto_async_request *req, int err)
 830 {
 831         struct journal_completion *comp = req->data;
 832         if (unlikely(err)) {
 833                 if (likely(err == -EINPROGRESS)) {
 834                         complete(&comp->ic->crypto_backoff);
 835                         return;
 836                 }
 837                 dm_integrity_io_error(comp->ic, "asynchronous encrypt", err);
 838         }
 839         complete_journal_op(comp);
 840 }
 841
 842 static bool do_crypt(bool encrypt, struct skcipher_request *req, struct journal_completion *comp)
 843 {
 844         int r;
 845         skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
 846                                       complete_journal_encrypt, comp);
 847         if (likely(encrypt))
 848                 r = crypto_skcipher_encrypt(req);
 849         else
 850                 r = crypto_skcipher_decrypt(req);
 851         if (likely(!r))
 852                 return false;
 853         if (likely(r == -EINPROGRESS))
 854                 return true;
 855         if (likely(r == -EBUSY)) {
 856                 wait_for_completion(&comp->ic->crypto_backoff);
 857                 reinit_completion(&comp->ic->crypto_backoff);
 858                 return true;
 859         }
 860         dm_integrity_io_error(comp->ic, "encrypt", r);
 861         return false;
 862 }
 863
 864 static void crypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
 865                           unsigned n_sections, struct journal_completion *comp)
 866 {
 867         struct scatterlist **source_sg;
 868         struct scatterlist **target_sg;
 869
 870         atomic_add(2, &comp->in_flight);
 871
 872         if (likely(encrypt)) {
 873                 source_sg = ic->journal_scatterlist;
 874                 target_sg = ic->journal_io_scatterlist;
 875         } else {
 876                 source_sg = ic->journal_io_scatterlist;
 877                 target_sg = ic->journal_scatterlist;
 878         }
 879
 880         do {
 881                 struct skcipher_request *req;
 882                 unsigned ivsize;
 883                 char *iv;
 884
 885                 if (likely(encrypt))
 886                         rw_section_mac(ic, section, true);
 887
 888                 req = ic->sk_requests[section];
 889                 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
 890                 iv = req->iv;
 891
 892                 memcpy(iv, iv + ivsize, ivsize);
 893
 894                 req->src = source_sg[section];
 895                 req->dst = target_sg[section];
 896
 897                 if (unlikely(do_crypt(encrypt, req, comp)))
 898                         atomic_inc(&comp->in_flight);
 899
 900                 section++;
 901                 n_sections--;
 902         } while (n_sections);
 903
 904         atomic_dec(&comp->in_flight);
 905         complete_journal_op(comp);
 906 }
 907
 908 static void encrypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
 909                             unsigned n_sections, struct journal_completion *comp)
 910 {
 911         if (ic->journal_xor)
 912                 return xor_journal(ic, encrypt, section, n_sections, comp);
 913         else
 914                 return crypt_journal(ic, encrypt, section, n_sections, comp);
 915 }
 916
 917 static void complete_journal_io(unsigned long error, void *context)
 918 {
 919         struct journal_completion *comp = context;
 920         if (unlikely(error != 0))
 921                 dm_integrity_io_error(comp->ic, "writing journal", -EIO);
 922         complete_journal_op(comp);
 923 }
 924
 925 static void rw_journal_sectors(struct dm_integrity_c *ic, int op, int op_flags,
 926                                unsigned sector, unsigned n_sectors, struct journal_completion *comp)
 927 {
 928         struct dm_io_request io_req;
 929         struct dm_io_region io_loc;
 930         unsigned pl_index, pl_offset;
 931         int r;
 932
 933         if (unlikely(dm_integrity_failed(ic))) {
 934                 if (comp)
 935                         complete_journal_io(-1UL, comp);
 936                 return;
 937         }
 938
 939         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
 940         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
 941
 942         io_req.bi_op = op;
 943         io_req.bi_op_flags = op_flags;
 944         io_req.mem.type = DM_IO_PAGE_LIST;
 945         if (ic->journal_io)
 946                 io_req.mem.ptr.pl = &ic->journal_io[pl_index];
 947         else
 948                 io_req.mem.ptr.pl = &ic->journal[pl_index];
 949         io_req.mem.offset = pl_offset;
 950         if (likely(comp != NULL)) {
 951                 io_req.notify.fn = complete_journal_io;
 952                 io_req.notify.context = comp;
 953         } else {
 954                 io_req.notify.fn = NULL;
 955         }
 956         io_req.client = ic->io;
 957         io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
 958         io_loc.sector = ic->start + SB_SECTORS + sector;
 959         io_loc.count = n_sectors;
 960
 961         r = dm_io(&io_req, 1, &io_loc, NULL);
 962         if (unlikely(r)) {
 963                 dm_integrity_io_error(ic, op == REQ_OP_READ ? "reading journal" : "writing journal", r);
 964                 if (comp) {
 965                         WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
 966                         complete_journal_io(-1UL, comp);
 967                 }
 968         }
 969 }
 970
 971 static void rw_journal(struct dm_integrity_c *ic, int op, int op_flags, unsigned section,
 972                        unsigned n_sections, struct journal_completion *comp)
 973 {
 974         unsigned sector, n_sectors;
 975
 976         sector = section * ic->journal_section_sectors;
 977         n_sectors = n_sections * ic->journal_section_sectors;
 978
 979         rw_journal_sectors(ic, op, op_flags, sector, n_sectors, comp);
 980 }
 981
 982 static void write_journal(struct dm_integrity_c *ic, unsigned commit_start, unsigned commit_sections)
 983 {
 984         struct journal_completion io_comp;
 985         struct journal_completion crypt_comp_1;
 986         struct journal_completion crypt_comp_2;
 987         unsigned i;
 988
 989         io_comp.ic = ic;
 990         init_completion(&io_comp.comp);
 991
 992         if (commit_start + commit_sections <= ic->journal_sections) {
 993                 io_comp.in_flight = (atomic_t)ATOMIC_INIT(1);
 994                 if (ic->journal_io) {
 995                         crypt_comp_1.ic = ic;
 996                         init_completion(&crypt_comp_1.comp);
 997                         crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
 998                         encrypt_journal(ic, true, commit_start, commit_sections, &crypt_comp_1);
 999                         wait_for_completion_io(&crypt_comp_1.comp);
1000                 } else {
1001                         for (i = 0; i < commit_sections; i++)
1002                                 rw_section_mac(ic, commit_start + i, true);
1003                 }
1004                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, commit_start,
1005                            commit_sections, &io_comp);
1006         } else {
1007                 unsigned to_end;
1008                 io_comp.in_flight = (atomic_t)ATOMIC_INIT(2);
1009                 to_end = ic->journal_sections - commit_start;
1010                 if (ic->journal_io) {
1011                         crypt_comp_1.ic = ic;
1012                         init_completion(&crypt_comp_1.comp);
1013                         crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1014                         encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1);
1015                         if (try_wait_for_completion(&crypt_comp_1.comp)) {
1016                                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1017                                 reinit_completion(&crypt_comp_1.comp);
1018                                 crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1019                                 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1);
1020                                 wait_for_completion_io(&crypt_comp_1.comp);
1021                         } else {
1022                                 crypt_comp_2.ic = ic;
1023                                 init_completion(&crypt_comp_2.comp);
1024                                 crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0);
1025                                 encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2);
1026                                 wait_for_completion_io(&crypt_comp_1.comp);
1027                                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1028                                 wait_for_completion_io(&crypt_comp_2.comp);
1029                         }
1030                 } else {
1031                         for (i = 0; i < to_end; i++)
1032                                 rw_section_mac(ic, commit_start + i, true);
1033                         rw_journal(ic, REQ_OP_WRITE, REQ_FUA, commit_start, to_end, &io_comp);
1034                         for (i = 0; i < commit_sections - to_end; i++)
1035                                 rw_section_mac(ic, i, true);
1036                 }
1037                 rw_journal(ic, REQ_OP_WRITE, REQ_FUA, 0, commit_sections - to_end, &io_comp);
1038         }
1039
1040         wait_for_completion_io(&io_comp.comp);
1041 }
1042
1043 static void copy_from_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset,
1044                               unsigned n_sectors, sector_t target, io_notify_fn fn, void *data)
1045 {
1046         struct dm_io_request io_req;
1047         struct dm_io_region io_loc;
1048         int r;
1049         unsigned sector, pl_index, pl_offset;
1050
1051         BUG_ON((target | n_sectors | offset) & (unsigned)(ic->sectors_per_block - 1));
1052
1053         if (unlikely(dm_integrity_failed(ic))) {
1054                 fn(-1UL, data);
1055                 return;
1056         }
1057
1058         sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset;
1059
1060         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
1061         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
1062
1063         io_req.bi_op = REQ_OP_WRITE;
1064         io_req.bi_op_flags = 0;
1065         io_req.mem.type = DM_IO_PAGE_LIST;
1066         io_req.mem.ptr.pl = &ic->journal[pl_index];
1067         io_req.mem.offset = pl_offset;
1068         io_req.notify.fn = fn;
1069         io_req.notify.context = data;
1070         io_req.client = ic->io;
1071         io_loc.bdev = ic->dev->bdev;
1072         io_loc.sector = target;
1073         io_loc.count = n_sectors;
1074
1075         r = dm_io(&io_req, 1, &io_loc, NULL);
1076         if (unlikely(r)) {
1077                 WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
1078                 fn(-1UL, data);
1079         }
1080 }
1081
1082 static bool ranges_overlap(struct dm_integrity_range *range1, struct dm_integrity_range *range2)
1083 {
1084         return range1->logical_sector < range2->logical_sector + range2->n_sectors &&
1085                range1->logical_sector + range1->n_sectors > range2->logical_sector;
1086 }
1087
1088 static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range, bool check_waiting)
1089 {
1090         struct rb_node **n = &ic->in_progress.rb_node;
1091         struct rb_node *parent;
1092
1093         BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned)(ic->sectors_per_block - 1));
1094
1095         if (likely(check_waiting)) {
1096                 struct dm_integrity_range *range;
1097                 list_for_each_entry(range, &ic->wait_list, wait_entry) {
1098                         if (unlikely(ranges_overlap(range, new_range)))
1099                                 return false;
1100                 }
1101         }
1102
1103         parent = NULL;
1104
1105         while (*n) {
1106                 struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node);
1107
1108                 parent = *n;
1109                 if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector) {
1110                         n = &range->node.rb_left;
1111                 } else if (new_range->logical_sector >= range->logical_sector + range->n_sectors) {
1112                         n = &range->node.rb_right;
1113                 } else {
1114                         return false;
1115                 }
1116         }
1117
1118         rb_link_node(&new_range->node, parent, n);
1119         rb_insert_color(&new_range->node, &ic->in_progress);
1120
1121         return true;
1122 }
1123
1124 static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1125 {
1126         rb_erase(&range->node, &ic->in_progress);
1127         while (unlikely(!list_empty(&ic->wait_list))) {
1128                 struct dm_integrity_range *last_range =
1129                         list_first_entry(&ic->wait_list, struct dm_integrity_range, wait_entry);
1130                 struct task_struct *last_range_task;
1131                 last_range_task = last_range->task;
1132                 list_del(&last_range->wait_entry);
1133                 if (!add_new_range(ic, last_range, false)) {
1134                         last_range->task = last_range_task;
1135                         list_add(&last_range->wait_entry, &ic->wait_list);
1136                         break;
1137                 }
1138                 last_range->waiting = false;
1139                 wake_up_process(last_range_task);
1140         }
1141 }
1142
1143 static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1144 {
1145         unsigned long flags;
1146
1147         spin_lock_irqsave(&ic->endio_wait.lock, flags);
1148         remove_range_unlocked(ic, range);
1149         spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1150 }
1151
1152 static void wait_and_add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1153 {
1154         new_range->waiting = true;
1155         list_add_tail(&new_range->wait_entry, &ic->wait_list);
1156         new_range->task = current;
1157         do {
1158                 __set_current_state(TASK_UNINTERRUPTIBLE);
1159                 spin_unlock_irq(&ic->endio_wait.lock);
1160                 io_schedule();
1161                 spin_lock_irq(&ic->endio_wait.lock);
1162         } while (unlikely(new_range->waiting));
1163 }
1164
1165 static void add_new_range_and_wait(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1166 {
1167         if (unlikely(!add_new_range(ic, new_range, true)))
1168                 wait_and_add_new_range(ic, new_range);
1169 }
1170
1171 static void init_journal_node(struct journal_node *node)
1172 {
1173         RB_CLEAR_NODE(&node->node);
1174         node->sector = (sector_t)-1;
1175 }
1176
1177 static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector)
1178 {
1179         struct rb_node **link;
1180         struct rb_node *parent;
1181
1182         node->sector = sector;
1183         BUG_ON(!RB_EMPTY_NODE(&node->node));
1184
1185         link = &ic->journal_tree_root.rb_node;
1186         parent = NULL;
1187
1188         while (*link) {
1189                 struct journal_node *j;
1190                 parent = *link;
1191                 j = container_of(parent, struct journal_node, node);
1192                 if (sector < j->sector)
1193                         link = &j->node.rb_left;
1194                 else
1195                         link = &j->node.rb_right;
1196         }
1197
1198         rb_link_node(&node->node, parent, link);
1199         rb_insert_color(&node->node, &ic->journal_tree_root);
1200 }
1201
1202 static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node)
1203 {
1204         BUG_ON(RB_EMPTY_NODE(&node->node));
1205         rb_erase(&node->node, &ic->journal_tree_root);
1206         init_journal_node(node);
1207 }
1208
1209 #define NOT_FOUND       (-1U)
1210
1211 static unsigned find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector)
1212 {
1213         struct rb_node *n = ic->journal_tree_root.rb_node;
1214         unsigned found = NOT_FOUND;
1215         *next_sector = (sector_t)-1;
1216         while (n) {
1217                 struct journal_node *j = container_of(n, struct journal_node, node);
1218                 if (sector == j->sector) {
1219                         found = j - ic->journal_tree;
1220                 }
1221                 if (sector < j->sector) {
1222                         *next_sector = j->sector;
1223                         n = j->node.rb_left;
1224                 } else {
1225                         n = j->node.rb_right;
1226                 }
1227         }
1228
1229         return found;
1230 }
1231
1232 static bool test_journal_node(struct dm_integrity_c *ic, unsigned pos, sector_t sector)
1233 {
1234         struct journal_node *node, *next_node;
1235         struct rb_node *next;
1236
1237         if (unlikely(pos >= ic->journal_entries))
1238                 return false;
1239         node = &ic->journal_tree[pos];
1240         if (unlikely(RB_EMPTY_NODE(&node->node)))
1241                 return false;
1242         if (unlikely(node->sector != sector))
1243                 return false;
1244
1245         next = rb_next(&node->node);
1246         if (unlikely(!next))
1247                 return true;
1248
1249         next_node = container_of(next, struct journal_node, node);
1250         return next_node->sector != sector;
1251 }
1252
1253 static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node)
1254 {
1255         struct rb_node *next;
1256         struct journal_node *next_node;
1257         unsigned next_section;
1258
1259         BUG_ON(RB_EMPTY_NODE(&node->node));
1260
1261         next = rb_next(&node->node);
1262         if (unlikely(!next))
1263                 return false;
1264
1265         next_node = container_of(next, struct journal_node, node);
1266
1267         if (next_node->sector != node->sector)
1268                 return false;
1269
1270         next_section = (unsigned)(next_node - ic->journal_tree) / ic->journal_section_entries;
1271         if (next_section >= ic->committed_section &&
1272             next_section < ic->committed_section + ic->n_committed_sections)
1273                 return true;
1274         if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections)
1275                 return true;
1276
1277         return false;
1278 }
1279
1280 #define TAG_READ        0
1281 #define TAG_WRITE       1
1282 #define TAG_CMP         2
1283
1284 static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block,
1285                                unsigned *metadata_offset, unsigned total_size, int op)
1286 {
1287         do {
1288                 unsigned char *data, *dp;
1289                 struct dm_buffer *b;
1290                 unsigned to_copy;
1291                 int r;
1292
1293                 r = dm_integrity_failed(ic);
1294                 if (unlikely(r))
1295                         return r;
1296
1297                 data = dm_bufio_read(ic->bufio, *metadata_block, &b);
1298                 if (IS_ERR(data))
1299                         return PTR_ERR(data);
1300
1301                 to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size);
1302                 dp = data + *metadata_offset;
1303                 if (op == TAG_READ) {
1304                         memcpy(tag, dp, to_copy);
1305                 } else if (op == TAG_WRITE) {
1306                         memcpy(dp, tag, to_copy);
1307                         dm_bufio_mark_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy);
1308                 } else  {
1309                         /* e.g.: op == TAG_CMP */
1310                         if (unlikely(memcmp(dp, tag, to_copy))) {
1311                                 unsigned i;
1312
1313                                 for (i = 0; i < to_copy; i++) {
1314                                         if (dp[i] != tag[i])
1315                                                 break;
1316                                         total_size--;
1317                                 }
1318                                 dm_bufio_release(b);
1319                                 return total_size;
1320                         }
1321                 }
1322                 dm_bufio_release(b);
1323
1324                 tag += to_copy;
1325                 *metadata_offset += to_copy;
1326                 if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) {
1327                         (*metadata_block)++;
1328                         *metadata_offset = 0;
1329                 }
1330                 total_size -= to_copy;
1331         } while (unlikely(total_size));
1332
1333         return 0;
1334 }
1335
1336 static void dm_integrity_flush_buffers(struct dm_integrity_c *ic)
1337 {
1338         int r;
1339         r = dm_bufio_write_dirty_buffers(ic->bufio);
1340         if (unlikely(r))
1341                 dm_integrity_io_error(ic, "writing tags", r);
1342 }
1343
1344 static void sleep_on_endio_wait(struct dm_integrity_c *ic)
1345 {
1346         DECLARE_WAITQUEUE(wait, current);
1347         __add_wait_queue(&ic->endio_wait, &wait);
1348         __set_current_state(TASK_UNINTERRUPTIBLE);
1349         spin_unlock_irq(&ic->endio_wait.lock);
1350         io_schedule();
1351         spin_lock_irq(&ic->endio_wait.lock);
1352         __remove_wait_queue(&ic->endio_wait, &wait);
1353 }
1354
1355 static void autocommit_fn(struct timer_list *t)
1356 {
1357         struct dm_integrity_c *ic = from_timer(ic, t, autocommit_timer);
1358
1359         if (likely(!dm_integrity_failed(ic)))
1360                 queue_work(ic->commit_wq, &ic->commit_work);
1361 }
1362
1363 static void schedule_autocommit(struct dm_integrity_c *ic)
1364 {
1365         if (!timer_pending(&ic->autocommit_timer))
1366                 mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies);
1367 }
1368
1369 static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1370 {
1371         struct bio *bio;
1372         unsigned long flags;
1373
1374         spin_lock_irqsave(&ic->endio_wait.lock, flags);
1375         bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1376         bio_list_add(&ic->flush_bio_list, bio);
1377         spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1378
1379         queue_work(ic->commit_wq, &ic->commit_work);
1380 }
1381
1382 static void do_endio(struct dm_integrity_c *ic, struct bio *bio)
1383 {
1384         int r = dm_integrity_failed(ic);
1385         if (unlikely(r) && !bio->bi_status)
1386                 bio->bi_status = errno_to_blk_status(r);
1387         if (unlikely(ic->synchronous_mode) && bio_op(bio) == REQ_OP_WRITE) {
1388                 unsigned long flags;
1389                 spin_lock_irqsave(&ic->endio_wait.lock, flags);
1390                 bio_list_add(&ic->synchronous_bios, bio);
1391                 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
1392                 spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1393                 return;
1394         }
1395         bio_endio(bio);
1396 }
1397
1398 static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1399 {
1400         struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1401
1402         if (unlikely(dio->fua) && likely(!bio->bi_status) && likely(!dm_integrity_failed(ic)))
1403                 submit_flush_bio(ic, dio);
1404         else
1405                 do_endio(ic, bio);
1406 }
1407
1408 static void dec_in_flight(struct dm_integrity_io *dio)
1409 {
1410         if (atomic_dec_and_test(&dio->in_flight)) {
1411                 struct dm_integrity_c *ic = dio->ic;
1412                 struct bio *bio;
1413
1414                 remove_range(ic, &dio->range);
1415
1416                 if (unlikely(dio->write))
1417                         schedule_autocommit(ic);
1418
1419                 bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1420
1421                 if (unlikely(dio->bi_status) && !bio->bi_status)
1422                         bio->bi_status = dio->bi_status;
1423                 if (likely(!bio->bi_status) && unlikely(bio_sectors(bio) != dio->range.n_sectors)) {
1424                         dio->range.logical_sector += dio->range.n_sectors;
1425                         bio_advance(bio, dio->range.n_sectors << SECTOR_SHIFT);
1426                         INIT_WORK(&dio->work, integrity_bio_wait);
1427                         queue_work(ic->wait_wq, &dio->work);
1428                         return;
1429                 }
1430                 do_endio_flush(ic, dio);
1431         }
1432 }
1433
1434 static void integrity_end_io(struct bio *bio)
1435 {
1436         struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1437
1438         bio->bi_iter = dio->orig_bi_iter;
1439         bio->bi_disk = dio->orig_bi_disk;
1440         bio->bi_partno = dio->orig_bi_partno;
1441         if (dio->orig_bi_integrity) {
1442                 bio->bi_integrity = dio->orig_bi_integrity;
1443                 bio->bi_opf |= REQ_INTEGRITY;
1444         }
1445         bio->bi_end_io = dio->orig_bi_end_io;
1446
1447         if (dio->completion)
1448                 complete(dio->completion);
1449
1450         dec_in_flight(dio);
1451 }
1452
1453 static void integrity_sector_checksum(struct dm_integrity_c *ic, sector_t sector,
1454                                       const char *data, char *result)
1455 {
1456         __u64 sector_le = cpu_to_le64(sector);
1457         SHASH_DESC_ON_STACK(req, ic->internal_hash);
1458         int r;
1459         unsigned digest_size;
1460
1461         req->tfm = ic->internal_hash;
1462
1463         r = crypto_shash_init(req);
1464         if (unlikely(r < 0)) {
1465                 dm_integrity_io_error(ic, "crypto_shash_init", r);
1466                 goto failed;
1467         }
1468
1469         r = crypto_shash_update(req, (const __u8 *)&sector_le, sizeof sector_le);
1470         if (unlikely(r < 0)) {
1471                 dm_integrity_io_error(ic, "crypto_shash_update", r);
1472                 goto failed;
1473         }
1474
1475         r = crypto_shash_update(req, data, ic->sectors_per_block << SECTOR_SHIFT);
1476         if (unlikely(r < 0)) {
1477                 dm_integrity_io_error(ic, "crypto_shash_update", r);
1478                 goto failed;
1479         }
1480
1481         r = crypto_shash_final(req, result);
1482         if (unlikely(r < 0)) {
1483                 dm_integrity_io_error(ic, "crypto_shash_final", r);
1484                 goto failed;
1485         }
1486
1487         digest_size = crypto_shash_digestsize(ic->internal_hash);
1488         if (unlikely(digest_size < ic->tag_size))
1489                 memset(result + digest_size, 0, ic->tag_size - digest_size);
1490
1491         return;
1492
1493 failed:
1494         /* this shouldn't happen anyway, the hash functions have no reason to fail */
1495         get_random_bytes(result, ic->tag_size);
1496 }
1497
1498 static void integrity_metadata(struct work_struct *w)
1499 {
1500         struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
1501         struct dm_integrity_c *ic = dio->ic;
1502
1503         int r;
1504
1505         if (ic->internal_hash) {
1506                 struct bvec_iter iter;
1507                 struct bio_vec bv;
1508                 unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1509                 struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1510                 char *checksums;
1511                 unsigned extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0;
1512                 char checksums_onstack[HASH_MAX_DIGESTSIZE];
1513                 unsigned sectors_to_process = dio->range.n_sectors;
1514                 sector_t sector = dio->range.logical_sector;
1515
1516                 if (unlikely(ic->mode == 'R'))
1517                         goto skip_io;
1518
1519                 checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT >> ic->sb->log2_sectors_per_block) * ic->tag_size + extra_space,
1520                                     GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN);
1521                 if (!checksums) {
1522                         checksums = checksums_onstack;
1523                         if (WARN_ON(extra_space &&
1524                                     digest_size > sizeof(checksums_onstack))) {
1525                                 r = -EINVAL;
1526                                 goto error;
1527                         }
1528                 }
1529
1530                 __bio_for_each_segment(bv, bio, iter, dio->orig_bi_iter) {
1531                         unsigned pos;
1532                         char *mem, *checksums_ptr;
1533
1534 again:
1535                         mem = (char *)kmap_atomic(bv.bv_page) + bv.bv_offset;
1536                         pos = 0;
1537                         checksums_ptr = checksums;
1538                         do {
1539                                 integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr);
1540                                 checksums_ptr += ic->tag_size;
1541                                 sectors_to_process -= ic->sectors_per_block;
1542                                 pos += ic->sectors_per_block << SECTOR_SHIFT;
1543                                 sector += ic->sectors_per_block;
1544                         } while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
1545                         kunmap_atomic(mem);
1546
1547                         r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1548                                                 checksums_ptr - checksums, !dio->write ? TAG_CMP : TAG_WRITE);
1549                         if (unlikely(r)) {
1550                                 if (r > 0) {
1551                                         DMERR_LIMIT("Checksum failed at sector 0x%llx",
1552                                                     (unsigned long long)(sector - ((r + ic->tag_size - 1) / ic->tag_size)));
1553                                         r = -EILSEQ;
1554                                         atomic64_inc(&ic->number_of_mismatches);
1555                                 }
1556                                 if (likely(checksums != checksums_onstack))
1557                                         kfree(checksums);
1558                                 goto error;
1559                         }
1560
1561                         if (!sectors_to_process)
1562                                 break;
1563
1564                         if (unlikely(pos < bv.bv_len)) {
1565                                 bv.bv_offset += pos;
1566                                 bv.bv_len -= pos;
1567                                 goto again;
1568                         }
1569                 }
1570
1571                 if (likely(checksums != checksums_onstack))
1572                         kfree(checksums);
1573         } else {
1574                 struct bio_integrity_payload *bip = dio->orig_bi_integrity;
1575
1576                 if (bip) {
1577                         struct bio_vec biv;
1578                         struct bvec_iter iter;
1579                         unsigned data_to_process = dio->range.n_sectors;
1580                         sector_to_block(ic, data_to_process);
1581                         data_to_process *= ic->tag_size;
1582
1583                         bip_for_each_vec(biv, bip, iter) {
1584                                 unsigned char *tag;
1585                                 unsigned this_len;
1586
1587                                 BUG_ON(PageHighMem(biv.bv_page));
1588                                 tag = lowmem_page_address(biv.bv_page) + biv.bv_offset;
1589                                 this_len = min(biv.bv_len, data_to_process);
1590                                 r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset,
1591                                                         this_len, !dio->write ? TAG_READ : TAG_WRITE);
1592                                 if (unlikely(r))
1593                                         goto error;
1594                                 data_to_process -= this_len;
1595                                 if (!data_to_process)
1596                                         break;
1597                         }
1598                 }
1599         }
1600 skip_io:
1601         dec_in_flight(dio);
1602         return;
1603 error:
1604         dio->bi_status = errno_to_blk_status(r);
1605         dec_in_flight(dio);
1606 }
1607
1608 static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
1609 {
1610         struct dm_integrity_c *ic = ti->private;
1611         struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1612         struct bio_integrity_payload *bip;
1613
1614         sector_t area, offset;
1615
1616         dio->ic = ic;
1617         dio->bi_status = 0;
1618
1619         if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
1620                 submit_flush_bio(ic, dio);
1621                 return DM_MAPIO_SUBMITTED;
1622         }
1623
1624         dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector);
1625         dio->write = bio_op(bio) == REQ_OP_WRITE;
1626         dio->fua = dio->write && bio->bi_opf & REQ_FUA;
1627         if (unlikely(dio->fua)) {
1628                 /*
1629                  * Don't pass down the FUA flag because we have to flush
1630                  * disk cache anyway.
1631                  */
1632                 bio->bi_opf &= ~REQ_FUA;
1633         }
1634         if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) {
1635                 DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx",
1636                       (unsigned long long)dio->range.logical_sector, bio_sectors(bio),
1637                       (unsigned long long)ic->provided_data_sectors);
1638                 return DM_MAPIO_KILL;
1639         }
1640         if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned)(ic->sectors_per_block - 1))) {
1641                 DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x",
1642                       ic->sectors_per_block,
1643                       (unsigned long long)dio->range.logical_sector, bio_sectors(bio));
1644                 return DM_MAPIO_KILL;
1645         }
1646
1647         if (ic->sectors_per_block > 1) {
1648                 struct bvec_iter iter;
1649                 struct bio_vec bv;
1650                 bio_for_each_segment(bv, bio, iter) {
1651                         if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
1652                                 DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
1653                                         bv.bv_offset, bv.bv_len, ic->sectors_per_block);
1654                                 return DM_MAPIO_KILL;
1655                         }
1656                 }
1657         }
1658
1659         bip = bio_integrity(bio);
1660         if (!ic->internal_hash) {
1661                 if (bip) {
1662                         unsigned wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block;
1663                         if (ic->log2_tag_size >= 0)
1664                                 wanted_tag_size <<= ic->log2_tag_size;
1665                         else
1666                                 wanted_tag_size *= ic->tag_size;
1667                         if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) {
1668                                 DMERR("Invalid integrity data size %u, expected %u",
1669                                       bip->bip_iter.bi_size, wanted_tag_size);
1670                                 return DM_MAPIO_KILL;
1671                         }
1672                 }
1673         } else {
1674                 if (unlikely(bip != NULL)) {
1675                         DMERR("Unexpected integrity data when using internal hash");
1676                         return DM_MAPIO_KILL;
1677                 }
1678         }
1679
1680         if (unlikely(ic->mode == 'R') && unlikely(dio->write))
1681                 return DM_MAPIO_KILL;
1682
1683         get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1684         dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1685         bio->bi_iter.bi_sector = get_data_sector(ic, area, offset);
1686
1687         dm_integrity_map_continue(dio, true);
1688         return DM_MAPIO_SUBMITTED;
1689 }
1690
1691 static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
1692                                  unsigned journal_section, unsigned journal_entry)
1693 {
1694         struct dm_integrity_c *ic = dio->ic;
1695         sector_t logical_sector;
1696         unsigned n_sectors;
1697
1698         logical_sector = dio->range.logical_sector;
1699         n_sectors = dio->range.n_sectors;
1700         do {
1701                 struct bio_vec bv = bio_iovec(bio);
1702                 char *mem;
1703
1704                 if (unlikely(bv.bv_len >> SECTOR_SHIFT > n_sectors))
1705                         bv.bv_len = n_sectors << SECTOR_SHIFT;
1706                 n_sectors -= bv.bv_len >> SECTOR_SHIFT;
1707                 bio_advance_iter(bio, &bio->bi_iter, bv.bv_len);
1708 retry_kmap:
1709                 mem = kmap_atomic(bv.bv_page);
1710                 if (likely(dio->write))
1711                         flush_dcache_page(bv.bv_page);
1712
1713                 do {
1714                         struct journal_entry *je = access_journal_entry(ic, journal_section, journal_entry);
1715
1716                         if (unlikely(!dio->write)) {
1717                                 struct journal_sector *js;
1718                                 char *mem_ptr;
1719                                 unsigned s;
1720
1721                                 if (unlikely(journal_entry_is_inprogress(je))) {
1722                                         flush_dcache_page(bv.bv_page);
1723                                         kunmap_atomic(mem);
1724
1725                                         __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
1726                                         goto retry_kmap;
1727                                 }
1728                                 smp_rmb();
1729                                 BUG_ON(journal_entry_get_sector(je) != logical_sector);
1730                                 js = access_journal_data(ic, journal_section, journal_entry);
1731                                 mem_ptr = mem + bv.bv_offset;
1732                                 s = 0;
1733                                 do {
1734                                         memcpy(mem_ptr, js, JOURNAL_SECTOR_DATA);
1735                                         *(commit_id_t *)(mem_ptr + JOURNAL_SECTOR_DATA) = je->last_bytes[s];
1736                                         js++;
1737                                         mem_ptr += 1 << SECTOR_SHIFT;
1738                                 } while (++s < ic->sectors_per_block);
1739 #ifdef INTERNAL_VERIFY
1740                                 if (ic->internal_hash) {
1741                                         char checksums_onstack[max(HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
1742
1743                                         integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack);
1744                                         if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) {
1745                                                 DMERR_LIMIT("Checksum failed when reading from journal, at sector 0x%llx",
1746                                                             (unsigned long long)logical_sector);
1747                                         }
1748                                 }
1749 #endif
1750                         }
1751
1752                         if (!ic->internal_hash) {
1753                                 struct bio_integrity_payload *bip = bio_integrity(bio);
1754                                 unsigned tag_todo = ic->tag_size;
1755                                 char *tag_ptr = journal_entry_tag(ic, je);
1756
1757                                 if (bip) do {
1758                                         struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
1759                                         unsigned tag_now = min(biv.bv_len, tag_todo);
1760                                         char *tag_addr;
1761                                         BUG_ON(PageHighMem(biv.bv_page));
1762                                         tag_addr = lowmem_page_address(biv.bv_page) + biv.bv_offset;
1763                                         if (likely(dio->write))
1764                                                 memcpy(tag_ptr, tag_addr, tag_now);
1765                                         else
1766                                                 memcpy(tag_addr, tag_ptr, tag_now);
1767                                         bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now);
1768                                         tag_ptr += tag_now;
1769                                         tag_todo -= tag_now;
1770                                 } while (unlikely(tag_todo)); else {
1771                                         if (likely(dio->write))
1772                                                 memset(tag_ptr, 0, tag_todo);
1773                                 }
1774                         }
1775
1776                         if (likely(dio->write)) {
1777                                 struct journal_sector *js;
1778                                 unsigned s;
1779
1780                                 js = access_journal_data(ic, journal_section, journal_entry);
1781                                 memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT);
1782
1783                                 s = 0;
1784                                 do {
1785                                         je->last_bytes[s] = js[s].commit_id;
1786                                 } while (++s < ic->sectors_per_block);
1787
1788                                 if (ic->internal_hash) {
1789                                         unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
1790                                         if (unlikely(digest_size > ic->tag_size)) {
1791                                                 char checksums_onstack[HASH_MAX_DIGESTSIZE];
1792                                                 integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack);
1793                                                 memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size);
1794                                         } else
1795                                                 integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je));
1796                                 }
1797
1798                                 journal_entry_set_sector(je, logical_sector);
1799                         }
1800                         logical_sector += ic->sectors_per_block;
1801
1802                         journal_entry++;
1803                         if (unlikely(journal_entry == ic->journal_section_entries)) {
1804                                 journal_entry = 0;
1805                                 journal_section++;
1806                                 wraparound_section(ic, &journal_section);
1807                         }
1808
1809                         bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT;
1810                 } while (bv.bv_len -= ic->sectors_per_block << SECTOR_SHIFT);
1811
1812                 if (unlikely(!dio->write))
1813                         flush_dcache_page(bv.bv_page);
1814                 kunmap_atomic(mem);
1815         } while (n_sectors);
1816
1817         if (likely(dio->write)) {
1818                 smp_mb();
1819                 if (unlikely(waitqueue_active(&ic->copy_to_journal_wait)))
1820                         wake_up(&ic->copy_to_journal_wait);
1821                 if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) {
1822                         queue_work(ic->commit_wq, &ic->commit_work);
1823                 } else {
1824                         schedule_autocommit(ic);
1825                 }
1826         } else {
1827                 remove_range(ic, &dio->range);
1828         }
1829
1830         if (unlikely(bio->bi_iter.bi_size)) {
1831                 sector_t area, offset;
1832
1833                 dio->range.logical_sector = logical_sector;
1834                 get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
1835                 dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
1836                 return true;
1837         }
1838
1839         return false;
1840 }
1841
1842 static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map)
1843 {
1844         struct dm_integrity_c *ic = dio->ic;
1845         struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1846         unsigned journal_section, journal_entry;
1847         unsigned journal_read_pos;
1848         struct completion read_comp;
1849         bool need_sync_io = ic->internal_hash && !dio->write;
1850
1851         if (need_sync_io && from_map) {
1852                 INIT_WORK(&dio->work, integrity_bio_wait);
1853                 queue_work(ic->metadata_wq, &dio->work);
1854                 return;
1855         }
1856
1857 lock_retry:
1858         spin_lock_irq(&ic->endio_wait.lock);
1859 retry:
1860         if (unlikely(dm_integrity_failed(ic))) {
1861                 spin_unlock_irq(&ic->endio_wait.lock);
1862                 do_endio(ic, bio);
1863                 return;
1864         }
1865         dio->range.n_sectors = bio_sectors(bio);
1866         journal_read_pos = NOT_FOUND;
1867         if (likely(ic->mode == 'J')) {
1868                 if (dio->write) {
1869                         unsigned next_entry, i, pos;
1870                         unsigned ws, we, range_sectors;
1871
1872                         dio->range.n_sectors = min(dio->range.n_sectors,
1873                                                    (sector_t)ic->free_sectors << ic->sb->log2_sectors_per_block);
1874                         if (unlikely(!dio->range.n_sectors)) {
1875                                 if (from_map)
1876                                         goto offload_to_thread;
1877                                 sleep_on_endio_wait(ic);
1878                                 goto retry;
1879                         }
1880                         range_sectors = dio->range.n_sectors >> ic->sb->log2_sectors_per_block;
1881                         ic->free_sectors -= range_sectors;
1882                         journal_section = ic->free_section;
1883                         journal_entry = ic->free_section_entry;
1884
1885                         next_entry = ic->free_section_entry + range_sectors;
1886                         ic->free_section_entry = next_entry % ic->journal_section_entries;
1887                         ic->free_section += next_entry / ic->journal_section_entries;
1888                         ic->n_uncommitted_sections += next_entry / ic->journal_section_entries;
1889                         wraparound_section(ic, &ic->free_section);
1890
1891                         pos = journal_section * ic->journal_section_entries + journal_entry;
1892                         ws = journal_section;
1893                         we = journal_entry;
1894                         i = 0;
1895                         do {
1896                                 struct journal_entry *je;
1897
1898                                 add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i);
1899                                 pos++;
1900                                 if (unlikely(pos >= ic->journal_entries))
1901                                         pos = 0;
1902
1903                                 je = access_journal_entry(ic, ws, we);
1904                                 BUG_ON(!journal_entry_is_unused(je));
1905                                 journal_entry_set_inprogress(je);
1906                                 we++;
1907                                 if (unlikely(we == ic->journal_section_entries)) {
1908                                         we = 0;
1909                                         ws++;
1910                                         wraparound_section(ic, &ws);
1911                                 }
1912                         } while ((i += ic->sectors_per_block) < dio->range.n_sectors);
1913
1914                         spin_unlock_irq(&ic->endio_wait.lock);
1915                         goto journal_read_write;
1916                 } else {
1917                         sector_t next_sector;
1918                         journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
1919                         if (likely(journal_read_pos == NOT_FOUND)) {
1920                                 if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector))
1921                                         dio->range.n_sectors = next_sector - dio->range.logical_sector;
1922                         } else {
1923                                 unsigned i;
1924                                 unsigned jp = journal_read_pos + 1;
1925                                 for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) {
1926                                         if (!test_journal_node(ic, jp, dio->range.logical_sector + i))
1927                                                 break;
1928                                 }
1929                                 dio->range.n_sectors = i;
1930                         }
1931                 }
1932         }
1933         if (unlikely(!add_new_range(ic, &dio->range, true))) {
1934                 /*
1935                  * We must not sleep in the request routine because it could
1936                  * stall bios on current->bio_list.
1937                  * So, we offload the bio to a workqueue if we have to sleep.
1938                  */
1939                 if (from_map) {
1940 offload_to_thread:
1941                         spin_unlock_irq(&ic->endio_wait.lock);
1942                         INIT_WORK(&dio->work, integrity_bio_wait);
1943                         queue_work(ic->wait_wq, &dio->work);
1944                         return;
1945                 }
1946                 wait_and_add_new_range(ic, &dio->range);
1947         }
1948         spin_unlock_irq(&ic->endio_wait.lock);
1949
1950         if (unlikely(journal_read_pos != NOT_FOUND)) {
1951                 journal_section = journal_read_pos / ic->journal_section_entries;
1952                 journal_entry = journal_read_pos % ic->journal_section_entries;
1953                 goto journal_read_write;
1954         }
1955
1956         if (ic->mode == 'B' && dio->write) {
1957                 if (!block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
1958                                      dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
1959                         struct bitmap_block_status *bbs;
1960
1961                         bbs = sector_to_bitmap_block(ic, dio->range.logical_sector);
1962                         spin_lock(&bbs->bio_queue_lock);
1963                         bio_list_add(&bbs->bio_queue, bio);
1964                         spin_unlock(&bbs->bio_queue_lock);
1965                         queue_work(ic->writer_wq, &bbs->work);
1966                         return;
1967                 }
1968         }
1969
1970         dio->in_flight = (atomic_t)ATOMIC_INIT(2);
1971
1972         if (need_sync_io) {
1973                 init_completion(&read_comp);
1974                 dio->completion = &read_comp;
1975         } else
1976                 dio->completion = NULL;
1977
1978         dio->orig_bi_iter = bio->bi_iter;
1979
1980         dio->orig_bi_disk = bio->bi_disk;
1981         dio->orig_bi_partno = bio->bi_partno;
1982         bio_set_dev(bio, ic->dev->bdev);
1983
1984         dio->orig_bi_integrity = bio_integrity(bio);
1985         bio->bi_integrity = NULL;
1986         bio->bi_opf &= ~REQ_INTEGRITY;
1987
1988         dio->orig_bi_end_io = bio->bi_end_io;
1989         bio->bi_end_io = integrity_end_io;
1990
1991         bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT;
1992         generic_make_request(bio);
1993
1994         if (need_sync_io) {
1995                 wait_for_completion_io(&read_comp);
1996                 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
1997                     dio->range.logical_sector + dio->range.n_sectors > le64_to_cpu(ic->sb->recalc_sector))
1998                         goto skip_check;
1999                 if (ic->mode == 'B') {
2000                         if (!block_bitmap_op(ic, ic->recalc_bitmap, dio->range.logical_sector,
2001                                              dio->range.n_sectors, BITMAP_OP_TEST_ALL_CLEAR))
2002                                 goto skip_check;
2003                 }
2004
2005                 if (likely(!bio->bi_status))
2006                         integrity_metadata(&dio->work);
2007                 else
2008 skip_check:
2009                         dec_in_flight(dio);
2010
2011         } else {
2012                 INIT_WORK(&dio->work, integrity_metadata);
2013                 queue_work(ic->metadata_wq, &dio->work);
2014         }
2015
2016         return;
2017
2018 journal_read_write:
2019         if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry)))
2020                 goto lock_retry;
2021
2022         do_endio_flush(ic, dio);
2023 }
2024
2025
2026 static void integrity_bio_wait(struct work_struct *w)
2027 {
2028         struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
2029
2030         dm_integrity_map_continue(dio, false);
2031 }
2032
2033 static void pad_uncommitted(struct dm_integrity_c *ic)
2034 {
2035         if (ic->free_section_entry) {
2036                 ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry;
2037                 ic->free_section_entry = 0;
2038                 ic->free_section++;
2039                 wraparound_section(ic, &ic->free_section);
2040                 ic->n_uncommitted_sections++;
2041         }
2042         if (WARN_ON(ic->journal_sections * ic->journal_section_entries !=
2043                     (ic->n_uncommitted_sections + ic->n_committed_sections) *
2044                     ic->journal_section_entries + ic->free_sectors)) {
2045                 DMCRIT("journal_sections %u, journal_section_entries %u, "
2046                        "n_uncommitted_sections %u, n_committed_sections %u, "
2047                        "journal_section_entries %u, free_sectors %u",
2048                        ic->journal_sections, ic->journal_section_entries,
2049                        ic->n_uncommitted_sections, ic->n_committed_sections,
2050                        ic->journal_section_entries, ic->free_sectors);
2051         }
2052 }
2053
2054 static void integrity_commit(struct work_struct *w)
2055 {
2056         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work);
2057         unsigned commit_start, commit_sections;
2058         unsigned i, j, n;
2059         struct bio *flushes;
2060
2061         del_timer(&ic->autocommit_timer);
2062
2063         spin_lock_irq(&ic->endio_wait.lock);
2064         flushes = bio_list_get(&ic->flush_bio_list);
2065         if (unlikely(ic->mode != 'J')) {
2066                 spin_unlock_irq(&ic->endio_wait.lock);
2067                 dm_integrity_flush_buffers(ic);
2068                 goto release_flush_bios;
2069         }
2070
2071         pad_uncommitted(ic);
2072         commit_start = ic->uncommitted_section;
2073         commit_sections = ic->n_uncommitted_sections;
2074         spin_unlock_irq(&ic->endio_wait.lock);
2075
2076         if (!commit_sections)
2077                 goto release_flush_bios;
2078
2079         i = commit_start;
2080         for (n = 0; n < commit_sections; n++) {
2081                 for (j = 0; j < ic->journal_section_entries; j++) {
2082                         struct journal_entry *je;
2083                         je = access_journal_entry(ic, i, j);
2084                         io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
2085                 }
2086                 for (j = 0; j < ic->journal_section_sectors; j++) {
2087                         struct journal_sector *js;
2088                         js = access_journal(ic, i, j);
2089                         js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq);
2090                 }
2091                 i++;
2092                 if (unlikely(i >= ic->journal_sections))
2093                         ic->commit_seq = next_commit_seq(ic->commit_seq);
2094                 wraparound_section(ic, &i);
2095         }
2096         smp_rmb();
2097
2098         write_journal(ic, commit_start, commit_sections);
2099
2100         spin_lock_irq(&ic->endio_wait.lock);
2101         ic->uncommitted_section += commit_sections;
2102         wraparound_section(ic, &ic->uncommitted_section);
2103         ic->n_uncommitted_sections -= commit_sections;
2104         ic->n_committed_sections += commit_sections;
2105         spin_unlock_irq(&ic->endio_wait.lock);
2106
2107         if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold)
2108                 queue_work(ic->writer_wq, &ic->writer_work);
2109
2110 release_flush_bios:
2111         while (flushes) {
2112                 struct bio *next = flushes->bi_next;
2113                 flushes->bi_next = NULL;
2114                 do_endio(ic, flushes);
2115                 flushes = next;
2116         }
2117 }
2118
2119 static void complete_copy_from_journal(unsigned long error, void *context)
2120 {
2121         struct journal_io *io = context;
2122         struct journal_completion *comp = io->comp;
2123         struct dm_integrity_c *ic = comp->ic;
2124         remove_range(ic, &io->range);
2125         mempool_free(io, &ic->journal_io_mempool);
2126         if (unlikely(error != 0))
2127                 dm_integrity_io_error(ic, "copying from journal", -EIO);
2128         complete_journal_op(comp);
2129 }
2130
2131 static void restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js,
2132                                struct journal_entry *je)
2133 {
2134         unsigned s = 0;
2135         do {
2136                 js->commit_id = je->last_bytes[s];
2137                 js++;
2138         } while (++s < ic->sectors_per_block);
2139 }
2140
2141 static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start,
2142                              unsigned write_sections, bool from_replay)
2143 {
2144         unsigned i, j, n;
2145         struct journal_completion comp;
2146         struct blk_plug plug;
2147
2148         blk_start_plug(&plug);
2149
2150         comp.ic = ic;
2151         comp.in_flight = (atomic_t)ATOMIC_INIT(1);
2152         init_completion(&comp.comp);
2153
2154         i = write_start;
2155         for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) {
2156 #ifndef INTERNAL_VERIFY
2157                 if (unlikely(from_replay))
2158 #endif
2159                         rw_section_mac(ic, i, false);
2160                 for (j = 0; j < ic->journal_section_entries; j++) {
2161                         struct journal_entry *je = access_journal_entry(ic, i, j);
2162                         sector_t sec, area, offset;
2163                         unsigned k, l, next_loop;
2164                         sector_t metadata_block;
2165                         unsigned metadata_offset;
2166                         struct journal_io *io;
2167
2168                         if (journal_entry_is_unused(je))
2169                                 continue;
2170                         BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay);
2171                         sec = journal_entry_get_sector(je);
2172                         if (unlikely(from_replay)) {
2173                                 if (unlikely(sec & (unsigned)(ic->sectors_per_block - 1))) {
2174                                         dm_integrity_io_error(ic, "invalid sector in journal", -EIO);
2175                                         sec &= ~(sector_t)(ic->sectors_per_block - 1);
2176                                 }
2177                         }
2178                         get_area_and_offset(ic, sec, &area, &offset);
2179                         restore_last_bytes(ic, access_journal_data(ic, i, j), je);
2180                         for (k = j + 1; k < ic->journal_section_entries; k++) {
2181                                 struct journal_entry *je2 = access_journal_entry(ic, i, k);
2182                                 sector_t sec2, area2, offset2;
2183                                 if (journal_entry_is_unused(je2))
2184                                         break;
2185                                 BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay);
2186                                 sec2 = journal_entry_get_sector(je2);
2187                                 get_area_and_offset(ic, sec2, &area2, &offset2);
2188                                 if (area2 != area || offset2 != offset + ((k - j) << ic->sb->log2_sectors_per_block))
2189                                         break;
2190                                 restore_last_bytes(ic, access_journal_data(ic, i, k), je2);
2191                         }
2192                         next_loop = k - 1;
2193
2194                         io = mempool_alloc(&ic->journal_io_mempool, GFP_NOIO);
2195                         io->comp = &comp;
2196                         io->range.logical_sector = sec;
2197                         io->range.n_sectors = (k - j) << ic->sb->log2_sectors_per_block;
2198
2199                         spin_lock_irq(&ic->endio_wait.lock);
2200                         add_new_range_and_wait(ic, &io->range);
2201
2202                         if (likely(!from_replay)) {
2203                                 struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries];
2204
2205                                 /* don't write if there is newer committed sector */
2206                                 while (j < k && find_newer_committed_node(ic, &section_node[j])) {
2207                                         struct journal_entry *je2 = access_journal_entry(ic, i, j);
2208
2209                                         journal_entry_set_unused(je2);
2210                                         remove_journal_node(ic, &section_node[j]);
2211                                         j++;
2212                                         sec += ic->sectors_per_block;
2213                                         offset += ic->sectors_per_block;
2214                                 }
2215                                 while (j < k && find_newer_committed_node(ic, &section_node[k - 1])) {
2216                                         struct journal_entry *je2 = access_journal_entry(ic, i, k - 1);
2217
2218                                         journal_entry_set_unused(je2);
2219                                         remove_journal_node(ic, &section_node[k - 1]);
2220                                         k--;
2221                                 }
2222                                 if (j == k) {
2223                                         remove_range_unlocked(ic, &io->range);
2224                                         spin_unlock_irq(&ic->endio_wait.lock);
2225                                         mempool_free(io, &ic->journal_io_mempool);
2226                                         goto skip_io;
2227                                 }
2228                                 for (l = j; l < k; l++) {
2229                                         remove_journal_node(ic, &section_node[l]);
2230                                 }
2231                         }
2232                         spin_unlock_irq(&ic->endio_wait.lock);
2233
2234                         metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2235                         for (l = j; l < k; l++) {
2236                                 int r;
2237                                 struct journal_entry *je2 = access_journal_entry(ic, i, l);
2238
2239                                 if (
2240 #ifndef INTERNAL_VERIFY
2241                                     unlikely(from_replay) &&
2242 #endif
2243                                     ic->internal_hash) {
2244                                         char test_tag[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
2245
2246                                         integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block),
2247                                                                   (char *)access_journal_data(ic, i, l), test_tag);
2248                                         if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size)))
2249                                                 dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ);
2250                                 }
2251
2252                                 journal_entry_set_unused(je2);
2253                                 r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset,
2254                                                         ic->tag_size, TAG_WRITE);
2255                                 if (unlikely(r)) {
2256                                         dm_integrity_io_error(ic, "reading tags", r);
2257                                 }
2258                         }
2259
2260                         atomic_inc(&comp.in_flight);
2261                         copy_from_journal(ic, i, j << ic->sb->log2_sectors_per_block,
2262                                           (k - j) << ic->sb->log2_sectors_per_block,
2263                                           get_data_sector(ic, area, offset),
2264                                           complete_copy_from_journal, io);
2265 skip_io:
2266                         j = next_loop;
2267                 }
2268         }
2269
2270         dm_bufio_write_dirty_buffers_async(ic->bufio);
2271
2272         blk_finish_plug(&plug);
2273
2274         complete_journal_op(&comp);
2275         wait_for_completion_io(&comp.comp);
2276
2277         dm_integrity_flush_buffers(ic);
2278 }
2279
2280 static void integrity_writer(struct work_struct *w)
2281 {
2282         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work);
2283         unsigned write_start, write_sections;
2284
2285         unsigned prev_free_sectors;
2286
2287         /* the following test is not needed, but it tests the replay code */
2288         if (READ_ONCE(ic->suspending) && !ic->meta_dev)
2289                 return;
2290
2291         spin_lock_irq(&ic->endio_wait.lock);
2292         write_start = ic->committed_section;
2293         write_sections = ic->n_committed_sections;
2294         spin_unlock_irq(&ic->endio_wait.lock);
2295
2296         if (!write_sections)
2297                 return;
2298
2299         do_journal_write(ic, write_start, write_sections, false);
2300
2301         spin_lock_irq(&ic->endio_wait.lock);
2302
2303         ic->committed_section += write_sections;
2304         wraparound_section(ic, &ic->committed_section);
2305         ic->n_committed_sections -= write_sections;
2306
2307         prev_free_sectors = ic->free_sectors;
2308         ic->free_sectors += write_sections * ic->journal_section_entries;
2309         if (unlikely(!prev_free_sectors))
2310                 wake_up_locked(&ic->endio_wait);
2311
2312         spin_unlock_irq(&ic->endio_wait.lock);
2313 }
2314
2315 static void recalc_write_super(struct dm_integrity_c *ic)
2316 {
2317         int r;
2318
2319         dm_integrity_flush_buffers(ic);
2320         if (dm_integrity_failed(ic))
2321                 return;
2322
2323         r = sync_rw_sb(ic, REQ_OP_WRITE, 0);
2324         if (unlikely(r))
2325                 dm_integrity_io_error(ic, "writing superblock", r);
2326 }
2327
2328 static void integrity_recalc(struct work_struct *w)
2329 {
2330         struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, recalc_work);
2331         struct dm_integrity_range range;
2332         struct dm_io_request io_req;
2333         struct dm_io_region io_loc;
2334         sector_t area, offset;
2335         sector_t metadata_block;
2336         unsigned metadata_offset;
2337         sector_t logical_sector, n_sectors;
2338         __u8 *t;
2339         unsigned i;
2340         int r;
2341         unsigned super_counter = 0;
2342
2343         DEBUG_print("start recalculation... (position %llx)\n", le64_to_cpu(ic->sb->recalc_sector));
2344
2345         spin_lock_irq(&ic->endio_wait.lock);
2346
2347 next_chunk:
2348
2349         if (unlikely(READ_ONCE(ic->suspending)))
2350                 goto unlock_ret;
2351
2352         range.logical_sector = le64_to_cpu(ic->sb->recalc_sector);
2353         if (unlikely(range.logical_sector >= ic->provided_data_sectors)) {
2354                 if (ic->mode == 'B') {
2355                         DEBUG_print("queue_delayed_work: bitmap_flush_work\n");
2356                         queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
2357                 }
2358                 goto unlock_ret;
2359         }
2360
2361         get_area_and_offset(ic, range.logical_sector, &area, &offset);
2362         range.n_sectors = min((sector_t)RECALC_SECTORS, ic->provided_data_sectors - range.logical_sector);
2363         if (!ic->meta_dev)
2364                 range.n_sectors = min(range.n_sectors, ((sector_t)1U << ic->sb->log2_interleave_sectors) - (unsigned)offset);
2365
2366         add_new_range_and_wait(ic, &range);
2367         spin_unlock_irq(&ic->endio_wait.lock);
2368         logical_sector = range.logical_sector;
2369         n_sectors = range.n_sectors;
2370
2371         if (ic->mode == 'B') {
2372                 if (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector, n_sectors, BITMAP_OP_TEST_ALL_CLEAR)) {
2373                         goto advance_and_next;
2374                 }
2375                 while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector,
2376                                        ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
2377                         logical_sector += ic->sectors_per_block;
2378                         n_sectors -= ic->sectors_per_block;
2379                         cond_resched();
2380                 }
2381                 while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector + n_sectors - ic->sectors_per_block,
2382                                        ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
2383                         n_sectors -= ic->sectors_per_block;
2384                         cond_resched();
2385                 }
2386                 get_area_and_offset(ic, logical_sector, &area, &offset);
2387         }
2388
2389         DEBUG_print("recalculating: %lx, %lx\n", logical_sector, n_sectors);
2390
2391         if (unlikely(++super_counter == RECALC_WRITE_SUPER)) {
2392                 recalc_write_super(ic);
2393                 if (ic->mode == 'B') {
2394                         queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2395                 }
2396                 super_counter = 0;
2397         }
2398
2399         if (unlikely(dm_integrity_failed(ic)))
2400                 goto err;
2401
2402         io_req.bi_op = REQ_OP_READ;
2403         io_req.bi_op_flags = 0;
2404         io_req.mem.type = DM_IO_VMA;
2405         io_req.mem.ptr.addr = ic->recalc_buffer;
2406         io_req.notify.fn = NULL;
2407         io_req.client = ic->io;
2408         io_loc.bdev = ic->dev->bdev;
2409         io_loc.sector = get_data_sector(ic, area, offset);
2410         io_loc.count = n_sectors;
2411
2412         r = dm_io(&io_req, 1, &io_loc, NULL);
2413         if (unlikely(r)) {
2414                 dm_integrity_io_error(ic, "reading data", r);
2415                 goto err;
2416         }
2417
2418         t = ic->recalc_tags;
2419         for (i = 0; i < n_sectors; i += ic->sectors_per_block) {
2420                 integrity_sector_checksum(ic, logical_sector + i, ic->recalc_buffer + (i << SECTOR_SHIFT), t);
2421                 t += ic->tag_size;
2422         }
2423
2424         metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2425
2426         r = dm_integrity_rw_tag(ic, ic->recalc_tags, &metadata_block, &metadata_offset, t - ic->recalc_tags, TAG_WRITE);
2427         if (unlikely(r)) {
2428                 dm_integrity_io_error(ic, "writing tags", r);
2429                 goto err;
2430         }
2431
2432 advance_and_next:
2433         cond_resched();
2434
2435         spin_lock_irq(&ic->endio_wait.lock);
2436         remove_range_unlocked(ic, &range);
2437         ic->sb->recalc_sector = cpu_to_le64(range.logical_sector + range.n_sectors);
2438         goto next_chunk;
2439
2440 err:
2441         remove_range(ic, &range);
2442         return;
2443
2444 unlock_ret:
2445         spin_unlock_irq(&ic->endio_wait.lock);
2446
2447         recalc_write_super(ic);
2448 }
2449
2450 static void bitmap_block_work(struct work_struct *w)
2451 {
2452         struct bitmap_block_status *bbs = container_of(w, struct bitmap_block_status, work);
2453         struct dm_integrity_c *ic = bbs->ic;
2454         struct bio *bio;
2455         struct bio_list bio_queue;
2456         struct bio_list waiting;
2457
2458         bio_list_init(&waiting);
2459
2460         spin_lock(&bbs->bio_queue_lock);
2461         bio_queue = bbs->bio_queue;
2462         bio_list_init(&bbs->bio_queue);
2463         spin_unlock(&bbs->bio_queue_lock);
2464
2465         while ((bio = bio_list_pop(&bio_queue))) {
2466                 struct dm_integrity_io *dio;
2467
2468                 dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2469
2470                 if (block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2471                                     dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
2472                         remove_range(ic, &dio->range);
2473                         INIT_WORK(&dio->work, integrity_bio_wait);
2474                         queue_work(ic->wait_wq, &dio->work);
2475                 } else {
2476                         block_bitmap_op(ic, ic->journal, dio->range.logical_sector,
2477                                         dio->range.n_sectors, BITMAP_OP_SET);
2478                         bio_list_add(&waiting, bio);
2479                 }
2480         }
2481
2482         if (bio_list_empty(&waiting))
2483                 return;
2484
2485         rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC,
2486                            bbs->idx * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT),
2487                            BITMAP_BLOCK_SIZE >> SECTOR_SHIFT, NULL);
2488
2489         while ((bio = bio_list_pop(&waiting))) {
2490                 struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2491
2492                 block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2493                                 dio->range.n_sectors, BITMAP_OP_SET);
2494
2495                 remove_range(ic, &dio->range);
2496                 INIT_WORK(&dio->work, integrity_bio_wait);
2497                 queue_work(ic->wait_wq, &dio->work);
2498         }
2499
2500         queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2501 }
2502
2503 static void bitmap_flush_work(struct work_struct *work)
2504 {
2505         struct dm_integrity_c *ic = container_of(work, struct dm_integrity_c, bitmap_flush_work.work);
2506         struct dm_integrity_range range;
2507         unsigned long limit;
2508         struct bio *bio;
2509
2510         dm_integrity_flush_buffers(ic);
2511
2512         range.logical_sector = 0;
2513         range.n_sectors = ic->provided_data_sectors;
2514
2515         spin_lock_irq(&ic->endio_wait.lock);
2516         add_new_range_and_wait(ic, &range);
2517         spin_unlock_irq(&ic->endio_wait.lock);
2518
2519         dm_integrity_flush_buffers(ic);
2520         if (ic->meta_dev)
2521                 blkdev_issue_flush(ic->dev->bdev, GFP_NOIO, NULL);
2522
2523         limit = ic->provided_data_sectors;
2524         if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
2525                 limit = le64_to_cpu(ic->sb->recalc_sector)
2526                         >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)
2527                         << (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2528         }
2529         /*DEBUG_print("zeroing journal\n");*/
2530         block_bitmap_op(ic, ic->journal, 0, limit, BITMAP_OP_CLEAR);
2531         block_bitmap_op(ic, ic->may_write_bitmap, 0, limit, BITMAP_OP_CLEAR);
2532
2533         rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
2534                            ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2535
2536         spin_lock_irq(&ic->endio_wait.lock);
2537         remove_range_unlocked(ic, &range);
2538         while (unlikely((bio = bio_list_pop(&ic->synchronous_bios)) != NULL)) {
2539                 bio_endio(bio);
2540                 spin_unlock_irq(&ic->endio_wait.lock);
2541                 spin_lock_irq(&ic->endio_wait.lock);
2542         }
2543         spin_unlock_irq(&ic->endio_wait.lock);
2544 }
2545
2546
2547 static void init_journal(struct dm_integrity_c *ic, unsigned start_section,
2548                          unsigned n_sections, unsigned char commit_seq)
2549 {
2550         unsigned i, j, n;
2551
2552         if (!n_sections)
2553                 return;
2554
2555         for (n = 0; n < n_sections; n++) {
2556                 i = start_section + n;
2557                 wraparound_section(ic, &i);
2558                 for (j = 0; j < ic->journal_section_sectors; j++) {
2559                         struct journal_sector *js = access_journal(ic, i, j);
2560                         memset(&js->entries, 0, JOURNAL_SECTOR_DATA);
2561                         js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq);
2562                 }
2563                 for (j = 0; j < ic->journal_section_entries; j++) {
2564                         struct journal_entry *je = access_journal_entry(ic, i, j);
2565                         journal_entry_set_unused(je);
2566                 }
2567         }
2568
2569         write_journal(ic, start_section, n_sections);
2570 }
2571
2572 static int find_commit_seq(struct dm_integrity_c *ic, unsigned i, unsigned j, commit_id_t id)
2573 {
2574         unsigned char k;
2575         for (k = 0; k < N_COMMIT_IDS; k++) {
2576                 if (dm_integrity_commit_id(ic, i, j, k) == id)
2577                         return k;
2578         }
2579         dm_integrity_io_error(ic, "journal commit id", -EIO);
2580         return -EIO;
2581 }
2582
2583 static void replay_journal(struct dm_integrity_c *ic)
2584 {
2585         unsigned i, j;
2586         bool used_commit_ids[N_COMMIT_IDS];
2587         unsigned max_commit_id_sections[N_COMMIT_IDS];
2588         unsigned write_start, write_sections;
2589         unsigned continue_section;
2590         bool journal_empty;
2591         unsigned char unused, last_used, want_commit_seq;
2592
2593         if (ic->mode == 'R')
2594                 return;
2595
2596         if (ic->journal_uptodate)
2597                 return;
2598
2599         last_used = 0;
2600         write_start = 0;
2601
2602         if (!ic->just_formatted) {
2603                 DEBUG_print("reading journal\n");
2604                 rw_journal(ic, REQ_OP_READ, 0, 0, ic->journal_sections, NULL);
2605                 if (ic->journal_io)
2606                         DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal");
2607                 if (ic->journal_io) {
2608                         struct journal_completion crypt_comp;
2609                         crypt_comp.ic = ic;
2610                         init_completion(&crypt_comp.comp);
2611                         crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0);
2612                         encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp);
2613                         wait_for_completion(&crypt_comp.comp);
2614                 }
2615                 DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal");
2616         }
2617
2618         if (dm_integrity_failed(ic))
2619                 goto clear_journal;
2620
2621         journal_empty = true;
2622         memset(used_commit_ids, 0, sizeof used_commit_ids);
2623         memset(max_commit_id_sections, 0, sizeof max_commit_id_sections);
2624         for (i = 0; i < ic->journal_sections; i++) {
2625                 for (j = 0; j < ic->journal_section_sectors; j++) {
2626                         int k;
2627                         struct journal_sector *js = access_journal(ic, i, j);
2628                         k = find_commit_seq(ic, i, j, js->commit_id);
2629                         if (k < 0)
2630                                 goto clear_journal;
2631                         used_commit_ids[k] = true;
2632                         max_commit_id_sections[k] = i;
2633                 }
2634                 if (journal_empty) {
2635                         for (j = 0; j < ic->journal_section_entries; j++) {
2636                                 struct journal_entry *je = access_journal_entry(ic, i, j);
2637                                 if (!journal_entry_is_unused(je)) {
2638                                         journal_empty = false;
2639                                         break;
2640                                 }
2641                         }
2642                 }
2643         }
2644
2645         if (!used_commit_ids[N_COMMIT_IDS - 1]) {
2646                 unused = N_COMMIT_IDS - 1;
2647                 while (unused && !used_commit_ids[unused - 1])
2648                         unused--;
2649         } else {
2650                 for (unused = 0; unused < N_COMMIT_IDS; unused++)
2651                         if (!used_commit_ids[unused])
2652                                 break;
2653                 if (unused == N_COMMIT_IDS) {
2654                         dm_integrity_io_error(ic, "journal commit ids", -EIO);
2655                         goto clear_journal;
2656                 }
2657         }
2658         DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n",
2659                     unused, used_commit_ids[0], used_commit_ids[1],
2660                     used_commit_ids[2], used_commit_ids[3]);
2661
2662         last_used = prev_commit_seq(unused);
2663         want_commit_seq = prev_commit_seq(last_used);
2664
2665         if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)])
2666                 journal_empty = true;
2667
2668         write_start = max_commit_id_sections[last_used] + 1;
2669         if (unlikely(write_start >= ic->journal_sections))
2670                 want_commit_seq = next_commit_seq(want_commit_seq);
2671         wraparound_section(ic, &write_start);
2672
2673         i = write_start;
2674         for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) {
2675                 for (j = 0; j < ic->journal_section_sectors; j++) {
2676                         struct journal_sector *js = access_journal(ic, i, j);
2677
2678                         if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) {
2679                                 /*
2680                                  * This could be caused by crash during writing.
2681                                  * We won't replay the inconsistent part of the
2682                                  * journal.
2683                                  */
2684                                 DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n",
2685                                             i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq);
2686                                 goto brk;
2687                         }
2688                 }
2689                 i++;
2690                 if (unlikely(i >= ic->journal_sections))
2691                         want_commit_seq = next_commit_seq(want_commit_seq);
2692                 wraparound_section(ic, &i);
2693         }
2694 brk:
2695
2696         if (!journal_empty) {
2697                 DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n",
2698                             write_sections, write_start, want_commit_seq);
2699                 do_journal_write(ic, write_start, write_sections, true);
2700         }
2701
2702         if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) {
2703                 continue_section = write_start;
2704                 ic->commit_seq = want_commit_seq;
2705                 DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq);
2706         } else {
2707                 unsigned s;
2708                 unsigned char erase_seq;
2709 clear_journal:
2710                 DEBUG_print("clearing journal\n");
2711
2712                 erase_seq = prev_commit_seq(prev_commit_seq(last_used));
2713                 s = write_start;
2714                 init_journal(ic, s, 1, erase_seq);
2715                 s++;
2716                 wraparound_section(ic, &s);
2717                 if (ic->journal_sections >= 2) {
2718                         init_journal(ic, s, ic->journal_sections - 2, erase_seq);
2719                         s += ic->journal_sections - 2;
2720                         wraparound_section(ic, &s);
2721                         init_journal(ic, s, 1, erase_seq);
2722                 }
2723
2724                 continue_section = 0;
2725                 ic->commit_seq = next_commit_seq(erase_seq);
2726         }
2727
2728         ic->committed_section = continue_section;
2729         ic->n_committed_sections = 0;
2730
2731         ic->uncommitted_section = continue_section;
2732         ic->n_uncommitted_sections = 0;
2733
2734         ic->free_section = continue_section;
2735         ic->free_section_entry = 0;
2736         ic->free_sectors = ic->journal_entries;
2737
2738         ic->journal_tree_root = RB_ROOT;
2739         for (i = 0; i < ic->journal_entries; i++)
2740                 init_journal_node(&ic->journal_tree[i]);
2741 }
2742
2743 static void dm_integrity_enter_synchronous_mode(struct dm_integrity_c *ic)
2744 {
2745         DEBUG_print("dm_integrity_enter_synchronous_mode\n");
2746
2747         if (ic->mode == 'B') {
2748                 ic->bitmap_flush_interval = msecs_to_jiffies(10) + 1;
2749                 ic->synchronous_mode = 1;
2750
2751                 cancel_delayed_work_sync(&ic->bitmap_flush_work);
2752                 queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
2753                 flush_workqueue(ic->commit_wq);
2754         }
2755 }
2756
2757 static int dm_integrity_reboot(struct notifier_block *n, unsigned long code, void *x)
2758 {
2759         struct dm_integrity_c *ic = container_of(n, struct dm_integrity_c, reboot_notifier);
2760
2761         DEBUG_print("dm_integrity_reboot\n");
2762
2763         dm_integrity_enter_synchronous_mode(ic);
2764
2765         return NOTIFY_DONE;
2766 }
2767
2768 static void dm_integrity_postsuspend(struct dm_target *ti)
2769 {
2770         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2771         int r;
2772
2773         WARN_ON(unregister_reboot_notifier(&ic->reboot_notifier));
2774
2775         del_timer_sync(&ic->autocommit_timer);
2776
2777         WRITE_ONCE(ic->suspending, 1);
2778
2779         if (ic->recalc_wq)
2780                 drain_workqueue(ic->recalc_wq);
2781
2782         if (ic->mode == 'B')
2783                 cancel_delayed_work_sync(&ic->bitmap_flush_work);
2784
2785         queue_work(ic->commit_wq, &ic->commit_work);
2786         drain_workqueue(ic->commit_wq);
2787
2788         if (ic->mode == 'J') {
2789                 if (ic->meta_dev)
2790                         queue_work(ic->writer_wq, &ic->writer_work);
2791                 drain_workqueue(ic->writer_wq);
2792                 dm_integrity_flush_buffers(ic);
2793         }
2794
2795         if (ic->mode == 'B') {
2796                 dm_integrity_flush_buffers(ic);
2797 #if 1
2798                 /* set to 0 to test bitmap replay code */
2799                 init_journal(ic, 0, ic->journal_sections, 0);
2800                 ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
2801                 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
2802                 if (unlikely(r))
2803                         dm_integrity_io_error(ic, "writing superblock", r);
2804 #endif
2805         }
2806
2807         WRITE_ONCE(ic->suspending, 0);
2808
2809         BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
2810
2811         ic->journal_uptodate = true;
2812 }
2813
2814 static void dm_integrity_resume(struct dm_target *ti)
2815 {
2816         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2817         int r;
2818         DEBUG_print("resume\n");
2819
2820         if (ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP)) {
2821                 DEBUG_print("resume dirty_bitmap\n");
2822                 rw_journal_sectors(ic, REQ_OP_READ, 0, 0,
2823                                    ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2824                 if (ic->mode == 'B') {
2825                         if (ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) {
2826                                 block_bitmap_copy(ic, ic->recalc_bitmap, ic->journal);
2827                                 block_bitmap_copy(ic, ic->may_write_bitmap, ic->journal);
2828                                 if (!block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors,
2829                                                      BITMAP_OP_TEST_ALL_CLEAR)) {
2830                                         ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
2831                                         ic->sb->recalc_sector = cpu_to_le64(0);
2832                                 }
2833                         } else {
2834                                 DEBUG_print("non-matching blocks_per_bitmap_bit: %u, %u\n",
2835                                             ic->sb->log2_blocks_per_bitmap_bit, ic->log2_blocks_per_bitmap_bit);
2836                                 ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
2837                                 block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
2838                                 block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
2839                                 block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_SET);
2840                                 rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
2841                                                    ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2842                                 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
2843                                 ic->sb->recalc_sector = cpu_to_le64(0);
2844                         }
2845                 } else {
2846                         if (!(ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
2847                               block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR))) {
2848                                 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
2849                                 ic->sb->recalc_sector = cpu_to_le64(0);
2850                         }
2851                         init_journal(ic, 0, ic->journal_sections, 0);
2852                         replay_journal(ic);
2853                         ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
2854                 }
2855                 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
2856                 if (unlikely(r))
2857                         dm_integrity_io_error(ic, "writing superblock", r);
2858         } else {
2859                 replay_journal(ic);
2860                 if (ic->mode == 'B') {
2861                         int mode;
2862                         ic->sb->flags |= cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
2863                         ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
2864                         r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
2865                         if (unlikely(r))
2866                                 dm_integrity_io_error(ic, "writing superblock", r);
2867
2868                         mode = ic->recalculate_flag ? BITMAP_OP_SET : BITMAP_OP_CLEAR;
2869                         block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, mode);
2870                         block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, mode);
2871                         block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, mode);
2872                         rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
2873                                            ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2874                 }
2875         }
2876
2877         DEBUG_print("testing recalc: %x\n", ic->sb->flags);
2878         if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
2879                 __u64 recalc_pos = le64_to_cpu(ic->sb->recalc_sector);
2880                 DEBUG_print("recalc pos: %lx / %lx\n", (long)recalc_pos, ic->provided_data_sectors);
2881                 if (recalc_pos < ic->provided_data_sectors) {
2882                         queue_work(ic->recalc_wq, &ic->recalc_work);
2883                 } else if (recalc_pos > ic->provided_data_sectors) {
2884                         ic->sb->recalc_sector = cpu_to_le64(ic->provided_data_sectors);
2885                         recalc_write_super(ic);
2886                 }
2887         }
2888
2889         ic->reboot_notifier.notifier_call = dm_integrity_reboot;
2890         ic->reboot_notifier.next = NULL;
2891         ic->reboot_notifier.priority = INT_MAX - 1;     /* be notified after md and before hardware drivers */
2892         WARN_ON(register_reboot_notifier(&ic->reboot_notifier));
2893
2894 #if 0
2895         /* set to 1 to stress test synchronous mode */
2896         dm_integrity_enter_synchronous_mode(ic);
2897 #endif
2898 }
2899
2900 static void dm_integrity_status(struct dm_target *ti, status_type_t type,
2901                                 unsigned status_flags, char *result, unsigned maxlen)
2902 {
2903         struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
2904         unsigned arg_count;
2905         size_t sz = 0;
2906
2907         switch (type) {
2908         case STATUSTYPE_INFO:
2909                 DMEMIT("%llu %llu",
2910                         (unsigned long long)atomic64_read(&ic->number_of_mismatches),
2911                         (unsigned long long)ic->provided_data_sectors);
2912                 if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
2913                         DMEMIT(" %llu", (unsigned long long)le64_to_cpu(ic->sb->recalc_sector));
2914                 else
2915                         DMEMIT(" -");
2916                 break;
2917
2918         case STATUSTYPE_TABLE: {
2919                 __u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100;
2920                 watermark_percentage += ic->journal_entries / 2;
2921                 do_div(watermark_percentage, ic->journal_entries);
2922                 arg_count = 3;
2923                 arg_count += !!ic->meta_dev;
2924                 arg_count += ic->sectors_per_block != 1;
2925                 arg_count += !!(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING));
2926                 arg_count += ic->mode == 'J';
2927                 arg_count += ic->mode == 'J';
2928                 arg_count += ic->mode == 'B';
2929                 arg_count += ic->mode == 'B';
2930                 arg_count += !!ic->internal_hash_alg.alg_string;
2931                 arg_count += !!ic->journal_crypt_alg.alg_string;
2932                 arg_count += !!ic->journal_mac_alg.alg_string;
2933                 DMEMIT("%s %llu %u %c %u", ic->dev->name, (unsigned long long)ic->start,
2934                        ic->tag_size, ic->mode, arg_count);
2935                 if (ic->meta_dev)
2936                         DMEMIT(" meta_device:%s", ic->meta_dev->name);
2937                 if (ic->sectors_per_block != 1)
2938                         DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
2939                 if (ic->recalculate_flag)
2940                         DMEMIT(" recalculate");
2941                 DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
2942                 DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors);
2943                 DMEMIT(" buffer_sectors:%u", 1U << ic->log2_buffer_sectors);
2944                 if (ic->mode == 'J') {
2945                         DMEMIT(" journal_watermark:%u", (unsigned)watermark_percentage);
2946                         DMEMIT(" commit_time:%u", ic->autocommit_msec);
2947                 }
2948                 if (ic->mode == 'B') {
2949                         DMEMIT(" sectors_per_bit:%llu", (unsigned long long)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit);
2950                         DMEMIT(" bitmap_flush_interval:%u", jiffies_to_msecs(ic->bitmap_flush_interval));
2951                 }
2952
2953 #define EMIT_ALG(a, n)                                                  \
2954                 do {                                                    \
2955                         if (ic->a.alg_string) {                         \
2956                                 DMEMIT(" %s:%s", n, ic->a.alg_string);  \
2957                                 if (ic->a.key_string)                   \
2958                                         DMEMIT(":%s", ic->a.key_string);\
2959                         }                                               \
2960                 } while (0)
2961                 EMIT_ALG(internal_hash_alg, "internal_hash");
2962                 EMIT_ALG(journal_crypt_alg, "journal_crypt");
2963                 EMIT_ALG(journal_mac_alg, "journal_mac");
2964                 break;
2965         }
2966         }
2967 }
2968
2969 static int dm_integrity_iterate_devices(struct dm_target *ti,
2970                                         iterate_devices_callout_fn fn, void *data)
2971 {
2972         struct dm_integrity_c *ic = ti->private;
2973
2974         if (!ic->meta_dev)
2975                 return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data);
2976         else
2977                 return fn(ti, ic->dev, 0, ti->len, data);
2978 }
2979
2980 static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits)
2981 {
2982         struct dm_integrity_c *ic = ti->private;
2983
2984         if (ic->sectors_per_block > 1) {
2985                 limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
2986                 limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
2987                 blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT);
2988         }
2989 }
2990
2991 static void calculate_journal_section_size(struct dm_integrity_c *ic)
2992 {
2993         unsigned sector_space = JOURNAL_SECTOR_DATA;
2994
2995         ic->journal_sections = le32_to_cpu(ic->sb->journal_sections);
2996         ic->journal_entry_size = roundup(offsetof(struct journal_entry, last_bytes[ic->sectors_per_block]) + ic->tag_size,
2997                                          JOURNAL_ENTRY_ROUNDUP);
2998
2999         if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC))
3000                 sector_space -= JOURNAL_MAC_PER_SECTOR;
3001         ic->journal_entries_per_sector = sector_space / ic->journal_entry_size;
3002         ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS;
3003         ic->journal_section_sectors = (ic->journal_section_entries << ic->sb->log2_sectors_per_block) + JOURNAL_BLOCK_SECTORS;
3004         ic->journal_entries = ic->journal_section_entries * ic->journal_sections;
3005 }
3006
3007 static int calculate_device_limits(struct dm_integrity_c *ic)
3008 {
3009         __u64 initial_sectors;
3010
3011         calculate_journal_section_size(ic);
3012         initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections;
3013         if (initial_sectors + METADATA_PADDING_SECTORS >= ic->meta_device_sectors || initial_sectors > UINT_MAX)
3014                 return -EINVAL;
3015         ic->initial_sectors = initial_sectors;
3016
3017         if (!ic->meta_dev) {
3018                 sector_t last_sector, last_area, last_offset;
3019
3020                 ic->metadata_run = roundup((__u64)ic->tag_size << (ic->sb->log2_interleave_sectors - ic->sb->log2_sectors_per_block),
3021                                            (__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS)) >> SECTOR_SHIFT;
3022                 if (!(ic->metadata_run & (ic->metadata_run - 1)))
3023                         ic->log2_metadata_run = __ffs(ic->metadata_run);
3024                 else
3025                         ic->log2_metadata_run = -1;
3026
3027                 get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset);
3028                 last_sector = get_data_sector(ic, last_area, last_offset);
3029                 if (last_sector < ic->start || last_sector >= ic->meta_device_sectors)
3030                         return -EINVAL;
3031         } else {
3032                 __u64 meta_size = (ic->provided_data_sectors >> ic->sb->log2_sectors_per_block) * ic->tag_size;
3033                 meta_size = (meta_size + ((1U << (ic->log2_buffer_sectors + SECTOR_SHIFT)) - 1))
3034                                 >> (ic->log2_buffer_sectors + SECTOR_SHIFT);
3035                 meta_size <<= ic->log2_buffer_sectors;
3036                 if (ic->initial_sectors + meta_size < ic->initial_sectors ||
3037                     ic->initial_sectors + meta_size > ic->meta_device_sectors)
3038                         return -EINVAL;
3039                 ic->metadata_run = 1;
3040                 ic->log2_metadata_run = 0;
3041         }
3042
3043         return 0;
3044 }
3045
3046 static int initialize_superblock(struct dm_integrity_c *ic, unsigned journal_sectors, unsigned interleave_sectors)
3047 {
3048         unsigned journal_sections;
3049         int test_bit;
3050
3051         memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT);
3052         memcpy(ic->sb->magic, SB_MAGIC, 8);
3053         ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size);
3054         ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block);
3055         if (ic->journal_mac_alg.alg_string)
3056                 ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC);
3057
3058         calculate_journal_section_size(ic);
3059         journal_sections = journal_sectors / ic->journal_section_sectors;
3060         if (!journal_sections)
3061                 journal_sections = 1;
3062
3063         if (!ic->meta_dev) {
3064                 ic->sb->journal_sections = cpu_to_le32(journal_sections);
3065                 if (!interleave_sectors)
3066                         interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
3067                 ic->sb->log2_interleave_sectors = __fls(interleave_sectors);
3068                 ic->sb->log2_interleave_sectors = max((__u8)MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3069                 ic->sb->log2_interleave_sectors = min((__u8)MAX_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3070
3071                 ic->provided_data_sectors = 0;
3072                 for (test_bit = fls64(ic->meta_device_sectors) - 1; test_bit >= 3; test_bit--) {
3073                         __u64 prev_data_sectors = ic->provided_data_sectors;
3074
3075                         ic->provided_data_sectors |= (sector_t)1 << test_bit;
3076                         if (calculate_device_limits(ic))
3077                                 ic->provided_data_sectors = prev_data_sectors;
3078                 }
3079                 if (!ic->provided_data_sectors)
3080                         return -EINVAL;
3081         } else {
3082                 ic->sb->log2_interleave_sectors = 0;
3083                 ic->provided_data_sectors = ic->data_device_sectors;
3084                 ic->provided_data_sectors &= ~(sector_t)(ic->sectors_per_block - 1);
3085
3086 try_smaller_buffer:
3087                 ic->sb->journal_sections = cpu_to_le32(0);
3088                 for (test_bit = fls(journal_sections) - 1; test_bit >= 0; test_bit--) {
3089                         __u32 prev_journal_sections = le32_to_cpu(ic->sb->journal_sections);
3090                         __u32 test_journal_sections = prev_journal_sections | (1U << test_bit);
3091                         if (test_journal_sections > journal_sections)
3092                                 continue;
3093                         ic->sb->journal_sections = cpu_to_le32(test_journal_sections);
3094                         if (calculate_device_limits(ic))
3095                                 ic->sb->journal_sections = cpu_to_le32(prev_journal_sections);
3096
3097                 }
3098                 if (!le32_to_cpu(ic->sb->journal_sections)) {
3099                         if (ic->log2_buffer_sectors > 3) {
3100                                 ic->log2_buffer_sectors--;
3101                                 goto try_smaller_buffer;
3102                         }
3103                         return -EINVAL;
3104                 }
3105         }
3106
3107         ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
3108
3109         sb_set_version(ic);
3110
3111         return 0;
3112 }
3113
3114 static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic)
3115 {
3116         struct gendisk *disk = dm_disk(dm_table_get_md(ti->table));
3117         struct blk_integrity bi;
3118
3119         memset(&bi, 0, sizeof(bi));
3120         bi.profile = &dm_integrity_profile;
3121         bi.tuple_size = ic->tag_size;
3122         bi.tag_size = bi.tuple_size;
3123         bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT;
3124
3125         blk_integrity_register(disk, &bi);
3126         blk_queue_max_integrity_segments(disk->queue, UINT_MAX);
3127 }
3128
3129 static void dm_integrity_free_page_list(struct page_list *pl)
3130 {
3131         unsigned i;
3132
3133         if (!pl)
3134                 return;
3135         for (i = 0; pl[i].page; i++)
3136                 __free_page(pl[i].page);
3137         kvfree(pl);
3138 }
3139
3140 static struct page_list *dm_integrity_alloc_page_list(unsigned n_pages)
3141 {
3142         struct page_list *pl;
3143         unsigned i;
3144
3145         pl = kvmalloc_array(n_pages + 1, sizeof(struct page_list), GFP_KERNEL | __GFP_ZERO);
3146         if (!pl)
3147                 return NULL;
3148
3149         for (i = 0; i < n_pages; i++) {
3150                 pl[i].page = alloc_page(GFP_KERNEL);
3151                 if (!pl[i].page) {
3152                         dm_integrity_free_page_list(pl);
3153                         return NULL;
3154                 }
3155                 if (i)
3156                         pl[i - 1].next = &pl[i];
3157         }
3158         pl[i].page = NULL;
3159         pl[i].next = NULL;
3160
3161         return pl;
3162 }
3163
3164 static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl)
3165 {
3166         unsigned i;
3167         for (i = 0; i < ic->journal_sections; i++)
3168                 kvfree(sl[i]);
3169         kvfree(sl);
3170 }
3171
3172 static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic,
3173                                                                    struct page_list *pl)
3174 {
3175         struct scatterlist **sl;
3176         unsigned i;
3177
3178         sl = kvmalloc_array(ic->journal_sections,
3179                             sizeof(struct scatterlist *),
3180                             GFP_KERNEL | __GFP_ZERO);
3181         if (!sl)
3182                 return NULL;
3183
3184         for (i = 0; i < ic->journal_sections; i++) {
3185                 struct scatterlist *s;
3186                 unsigned start_index, start_offset;
3187                 unsigned end_index, end_offset;
3188                 unsigned n_pages;
3189                 unsigned idx;
3190
3191                 page_list_location(ic, i, 0, &start_index, &start_offset);
3192                 page_list_location(ic, i, ic->journal_section_sectors - 1,
3193                                    &end_index, &end_offset);
3194
3195                 n_pages = (end_index - start_index + 1);
3196
3197                 s = kvmalloc_array(n_pages, sizeof(struct scatterlist),
3198                                    GFP_KERNEL);
3199                 if (!s) {
3200                         dm_integrity_free_journal_scatterlist(ic, sl);
3201                         return NULL;
3202                 }
3203
3204                 sg_init_table(s, n_pages);
3205                 for (idx = start_index; idx <= end_index; idx++) {
3206                         char *va = lowmem_page_address(pl[idx].page);
3207                         unsigned start = 0, end = PAGE_SIZE;
3208                         if (idx == start_index)
3209                                 start = start_offset;
3210                         if (idx == end_index)
3211                                 end = end_offset + (1 << SECTOR_SHIFT);
3212                         sg_set_buf(&s[idx - start_index], va + start, end - start);
3213                 }
3214
3215                 sl[i] = s;
3216         }
3217
3218         return sl;
3219 }
3220
3221 static void free_alg(struct alg_spec *a)
3222 {
3223         kzfree(a->alg_string);
3224         kzfree(a->key);
3225         memset(a, 0, sizeof *a);
3226 }
3227
3228 static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval)
3229 {
3230         char *k;
3231
3232         free_alg(a);
3233
3234         a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL);
3235         if (!a->alg_string)
3236                 goto nomem;
3237
3238         k = strchr(a->alg_string, ':');
3239         if (k) {
3240                 *k = 0;
3241                 a->key_string = k + 1;
3242                 if (strlen(a->key_string) & 1)
3243                         goto inval;
3244
3245                 a->key_size = strlen(a->key_string) / 2;
3246                 a->key = kmalloc(a->key_size, GFP_KERNEL);
3247                 if (!a->key)
3248                         goto nomem;
3249                 if (hex2bin(a->key, a->key_string, a->key_size))
3250                         goto inval;
3251         }
3252
3253         return 0;
3254 inval:
3255         *error = error_inval;
3256         return -EINVAL;
3257 nomem:
3258         *error = "Out of memory for an argument";
3259         return -ENOMEM;
3260 }
3261
3262 static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error,
3263                    char *error_alg, char *error_key)
3264 {
3265         int r;
3266
3267         if (a->alg_string) {
3268                 *hash = crypto_alloc_shash(a->alg_string, 0, 0);
3269                 if (IS_ERR(*hash)) {
3270                         *error = error_alg;
3271                         r = PTR_ERR(*hash);
3272                         *hash = NULL;
3273                         return r;
3274                 }
3275
3276                 if (a->key) {
3277                         r = crypto_shash_setkey(*hash, a->key, a->key_size);
3278                         if (r) {
3279                                 *error = error_key;
3280                                 return r;
3281                         }
3282                 } else if (crypto_shash_get_flags(*hash) & CRYPTO_TFM_NEED_KEY) {
3283                         *error = error_key;
3284                         return -ENOKEY;
3285                 }
3286         }
3287
3288         return 0;
3289 }
3290
3291 static int create_journal(struct dm_integrity_c *ic, char **error)
3292 {
3293         int r = 0;
3294         unsigned i;
3295         __u64 journal_pages, journal_desc_size, journal_tree_size;
3296         unsigned char *crypt_data = NULL, *crypt_iv = NULL;
3297         struct skcipher_request *req = NULL;
3298
3299         ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL);
3300         ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL);
3301         ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL);
3302         ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL);
3303
3304         journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
3305                                 PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
3306         journal_desc_size = journal_pages * sizeof(struct page_list);
3307         if (journal_pages >= totalram_pages() - totalhigh_pages() || journal_desc_size > ULONG_MAX) {
3308                 *error = "Journal doesn't fit into memory";
3309                 r = -ENOMEM;
3310                 goto bad;
3311         }
3312         ic->journal_pages = journal_pages;
3313
3314         ic->journal = dm_integrity_alloc_page_list(ic->journal_pages);
3315         if (!ic->journal) {
3316                 *error = "Could not allocate memory for journal";
3317                 r = -ENOMEM;
3318                 goto bad;
3319         }
3320         if (ic->journal_crypt_alg.alg_string) {
3321                 unsigned ivsize, blocksize;
3322                 struct journal_completion comp;
3323
3324                 comp.ic = ic;
3325                 ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, 0);
3326                 if (IS_ERR(ic->journal_crypt)) {
3327                         *error = "Invalid journal cipher";
3328                         r = PTR_ERR(ic->journal_crypt);
3329                         ic->journal_crypt = NULL;
3330                         goto bad;
3331                 }
3332                 ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
3333                 blocksize = crypto_skcipher_blocksize(ic->journal_crypt);
3334
3335                 if (ic->journal_crypt_alg.key) {
3336                         r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key,
3337                                                    ic->journal_crypt_alg.key_size);
3338                         if (r) {
3339                                 *error = "Error setting encryption key";
3340                                 goto bad;
3341                         }
3342                 }
3343                 DEBUG_print("cipher %s, block size %u iv size %u\n",
3344                             ic->journal_crypt_alg.alg_string, blocksize, ivsize);
3345
3346                 ic->journal_io = dm_integrity_alloc_page_list(ic->journal_pages);
3347                 if (!ic->journal_io) {
3348                         *error = "Could not allocate memory for journal io";
3349                         r = -ENOMEM;
3350                         goto bad;
3351                 }
3352
3353                 if (blocksize == 1) {
3354                         struct scatterlist *sg;
3355
3356                         req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3357                         if (!req) {
3358                                 *error = "Could not allocate crypt request";
3359                                 r = -ENOMEM;
3360                                 goto bad;
3361                         }
3362
3363                         crypt_iv = kzalloc(ivsize, GFP_KERNEL);
3364                         if (!crypt_iv) {
3365                                 *error = "Could not allocate iv";
3366                                 r = -ENOMEM;
3367                                 goto bad;
3368                         }
3369
3370                         ic->journal_xor = dm_integrity_alloc_page_list(ic->journal_pages);
3371                         if (!ic->journal_xor) {
3372                                 *error = "Could not allocate memory for journal xor";
3373                                 r = -ENOMEM;
3374                                 goto bad;
3375                         }
3376
3377                         sg = kvmalloc_array(ic->journal_pages + 1,
3378                                             sizeof(struct scatterlist),
3379                                             GFP_KERNEL);
3380                         if (!sg) {
3381                                 *error = "Unable to allocate sg list";
3382                                 r = -ENOMEM;
3383                                 goto bad;
3384                         }
3385                         sg_init_table(sg, ic->journal_pages + 1);
3386                         for (i = 0; i < ic->journal_pages; i++) {
3387                                 char *va = lowmem_page_address(ic->journal_xor[i].page);
3388                                 clear_page(va);
3389                                 sg_set_buf(&sg[i], va, PAGE_SIZE);
3390                         }
3391                         sg_set_buf(&sg[i], &ic->commit_ids, sizeof ic->commit_ids);
3392
3393                         skcipher_request_set_crypt(req, sg, sg,
3394                                                    PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, crypt_iv);
3395                         init_completion(&comp.comp);
3396                         comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3397                         if (do_crypt(true, req, &comp))
3398                                 wait_for_completion(&comp.comp);
3399                         kvfree(sg);
3400                         r = dm_integrity_failed(ic);
3401                         if (r) {
3402                                 *error = "Unable to encrypt journal";
3403                                 goto bad;
3404                         }
3405                         DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data");
3406
3407                         crypto_free_skcipher(ic->journal_crypt);
3408                         ic->journal_crypt = NULL;
3409                 } else {
3410                         unsigned crypt_len = roundup(ivsize, blocksize);
3411
3412                         req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3413                         if (!req) {
3414                                 *error = "Could not allocate crypt request";
3415                                 r = -ENOMEM;
3416                                 goto bad;
3417                         }
3418
3419                         crypt_iv = kmalloc(ivsize, GFP_KERNEL);
3420                         if (!crypt_iv) {
3421                                 *error = "Could not allocate iv";
3422                                 r = -ENOMEM;
3423                                 goto bad;
3424                         }
3425
3426                         crypt_data = kmalloc(crypt_len, GFP_KERNEL);
3427                         if (!crypt_data) {
3428                                 *error = "Unable to allocate crypt data";
3429                                 r = -ENOMEM;
3430                                 goto bad;
3431                         }
3432
3433                         ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal);
3434                         if (!ic->journal_scatterlist) {
3435                                 *error = "Unable to allocate sg list";
3436                                 r = -ENOMEM;
3437                                 goto bad;
3438                         }
3439                         ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io);
3440                         if (!ic->journal_io_scatterlist) {
3441                                 *error = "Unable to allocate sg list";
3442                                 r = -ENOMEM;
3443                                 goto bad;
3444                         }
3445                         ic->sk_requests = kvmalloc_array(ic->journal_sections,
3446                                                          sizeof(struct skcipher_request *),
3447                                                          GFP_KERNEL | __GFP_ZERO);
3448                         if (!ic->sk_requests) {
3449                                 *error = "Unable to allocate sk requests";
3450                                 r = -ENOMEM;
3451                                 goto bad;
3452                         }
3453                         for (i = 0; i < ic->journal_sections; i++) {
3454                                 struct scatterlist sg;
3455                                 struct skcipher_request *section_req;
3456                                 __u32 section_le = cpu_to_le32(i);
3457
3458                                 memset(crypt_iv, 0x00, ivsize);
3459                                 memset(crypt_data, 0x00, crypt_len);
3460                                 memcpy(crypt_data, &section_le, min((size_t)crypt_len, sizeof(section_le)));
3461
3462                                 sg_init_one(&sg, crypt_data, crypt_len);
3463                                 skcipher_request_set_crypt(req, &sg, &sg, crypt_len, crypt_iv);
3464                                 init_completion(&comp.comp);
3465                                 comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3466                                 if (do_crypt(true, req, &comp))
3467                                         wait_for_completion(&comp.comp);
3468
3469                                 r = dm_integrity_failed(ic);
3470                                 if (r) {
3471                                         *error = "Unable to generate iv";
3472                                         goto bad;
3473                                 }
3474
3475                                 section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3476                                 if (!section_req) {
3477                                         *error = "Unable to allocate crypt request";
3478                                         r = -ENOMEM;
3479                                         goto bad;
3480                                 }
3481                                 section_req->iv = kmalloc_array(ivsize, 2,
3482                                                                 GFP_KERNEL);
3483                                 if (!section_req->iv) {
3484                                         skcipher_request_free(section_req);
3485                                         *error = "Unable to allocate iv";
3486                                         r = -ENOMEM;
3487                                         goto bad;
3488                                 }
3489                                 memcpy(section_req->iv + ivsize, crypt_data, ivsize);
3490                                 section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT;
3491                                 ic->sk_requests[i] = section_req;
3492                                 DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i);
3493                         }
3494                 }
3495         }
3496
3497         for (i = 0; i < N_COMMIT_IDS; i++) {
3498                 unsigned j;
3499 retest_commit_id:
3500                 for (j = 0; j < i; j++) {
3501                         if (ic->commit_ids[j] == ic->commit_ids[i]) {
3502                                 ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1);
3503                                 goto retest_commit_id;
3504                         }
3505                 }
3506                 DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]);
3507         }
3508
3509         journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node);
3510         if (journal_tree_size > ULONG_MAX) {
3511                 *error = "Journal doesn't fit into memory";
3512                 r = -ENOMEM;
3513                 goto bad;
3514         }
3515         ic->journal_tree = kvmalloc(journal_tree_size, GFP_KERNEL);
3516         if (!ic->journal_tree) {
3517                 *error = "Could not allocate memory for journal tree";
3518                 r = -ENOMEM;
3519         }
3520 bad:
3521         kfree(crypt_data);
3522         kfree(crypt_iv);
3523         skcipher_request_free(req);
3524
3525         return r;
3526 }
3527
3528 /*
3529  * Construct a integrity mapping
3530  *
3531  * Arguments:
3532  *      device
3533  *      offset from the start of the device
3534  *      tag size
3535  *      D - direct writes, J - journal writes, B - bitmap mode, R - recovery mode
3536  *      number of optional arguments
3537  *      optional arguments:
3538  *              journal_sectors
3539  *              interleave_sectors
3540  *              buffer_sectors
3541  *              journal_watermark
3542  *              commit_time
3543  *              meta_device
3544  *              block_size
3545  *              sectors_per_bit
3546  *              bitmap_flush_interval
3547  *              internal_hash
3548  *              journal_crypt
3549  *              journal_mac
3550  *              recalculate
3551  */
3552 static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
3553 {
3554         struct dm_integrity_c *ic;
3555         char dummy;
3556         int r;
3557         unsigned extra_args;
3558         struct dm_arg_set as;
3559         static const struct dm_arg _args[] = {
3560                 {0, 9, "Invalid number of feature args"},
3561         };
3562         unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
3563         bool should_write_sb;
3564         __u64 threshold;
3565         unsigned long long start;
3566         __s8 log2_sectors_per_bitmap_bit = -1;
3567         __s8 log2_blocks_per_bitmap_bit;
3568         __u64 bits_in_journal;
3569         __u64 n_bitmap_bits;
3570
3571 #define DIRECT_ARGUMENTS        4
3572
3573         if (argc <= DIRECT_ARGUMENTS) {
3574                 ti->error = "Invalid argument count";
3575                 return -EINVAL;
3576         }
3577
3578         ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL);
3579         if (!ic) {
3580                 ti->error = "Cannot allocate integrity context";
3581                 return -ENOMEM;
3582         }
3583         ti->private = ic;
3584         ti->per_io_data_size = sizeof(struct dm_integrity_io);
3585
3586         ic->in_progress = RB_ROOT;
3587         INIT_LIST_HEAD(&ic->wait_list);
3588         init_waitqueue_head(&ic->endio_wait);
3589         bio_list_init(&ic->flush_bio_list);
3590         init_waitqueue_head(&ic->copy_to_journal_wait);
3591         init_completion(&ic->crypto_backoff);
3592         atomic64_set(&ic->number_of_mismatches, 0);
3593         ic->bitmap_flush_interval = BITMAP_FLUSH_INTERVAL;
3594
3595         r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
3596         if (r) {
3597                 ti->error = "Device lookup failed";
3598                 goto bad;
3599         }
3600
3601         if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) {
3602                 ti->error = "Invalid starting offset";
3603                 r = -EINVAL;
3604                 goto bad;
3605         }
3606         ic->start = start;
3607
3608         if (strcmp(argv[2], "-")) {
3609                 if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) {
3610                         ti->error = "Invalid tag size";
3611                         r = -EINVAL;
3612                         goto bad;
3613                 }
3614         }
3615
3616         if (!strcmp(argv[3], "J") || !strcmp(argv[3], "B") ||
3617             !strcmp(argv[3], "D") || !strcmp(argv[3], "R")) {
3618                 ic->mode = argv[3][0];
3619         } else {
3620                 ti->error = "Invalid mode (expecting J, B, D, R)";
3621                 r = -EINVAL;
3622                 goto bad;
3623         }
3624
3625         journal_sectors = 0;
3626         interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
3627         buffer_sectors = DEFAULT_BUFFER_SECTORS;
3628         journal_watermark = DEFAULT_JOURNAL_WATERMARK;
3629         sync_msec = DEFAULT_SYNC_MSEC;
3630         ic->sectors_per_block = 1;
3631
3632         as.argc = argc - DIRECT_ARGUMENTS;
3633         as.argv = argv + DIRECT_ARGUMENTS;
3634         r = dm_read_arg_group(_args, &as, &extra_args, &ti->error);
3635         if (r)
3636                 goto bad;
3637
3638         while (extra_args--) {
3639                 const char *opt_string;
3640                 unsigned val;
3641                 unsigned long long llval;
3642                 opt_string = dm_shift_arg(&as);
3643                 if (!opt_string) {
3644                         r = -EINVAL;
3645                         ti->error = "Not enough feature arguments";
3646                         goto bad;
3647                 }
3648                 if (sscanf(opt_string, "journal_sectors:%u%c", &val, &dummy) == 1)
3649                         journal_sectors = val ? val : 1;
3650                 else if (sscanf(opt_string, "interleave_sectors:%u%c", &val, &dummy) == 1)
3651                         interleave_sectors = val;
3652                 else if (sscanf(opt_string, "buffer_sectors:%u%c", &val, &dummy) == 1)
3653                         buffer_sectors = val;
3654                 else if (sscanf(opt_string, "journal_watermark:%u%c", &val, &dummy) == 1 && val <= 100)
3655                         journal_watermark = val;
3656                 else if (sscanf(opt_string, "commit_time:%u%c", &val, &dummy) == 1)
3657                         sync_msec = val;
3658                 else if (!strncmp(opt_string, "meta_device:", strlen("meta_device:"))) {
3659                         if (ic->meta_dev) {
3660                                 dm_put_device(ti, ic->meta_dev);
3661                                 ic->meta_dev = NULL;
3662                         }
3663                         r = dm_get_device(ti, strchr(opt_string, ':') + 1,
3664                                           dm_table_get_mode(ti->table), &ic->meta_dev);
3665                         if (r) {
3666                                 ti->error = "Device lookup failed";
3667                                 goto bad;
3668                         }
3669                 } else if (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) {
3670                         if (val < 1 << SECTOR_SHIFT ||
3671                             val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT ||
3672                             (val & (val -1))) {
3673                                 r = -EINVAL;
3674                                 ti->error = "Invalid block_size argument";
3675                                 goto bad;
3676                         }
3677                         ic->sectors_per_block = val >> SECTOR_SHIFT;
3678                 } else if (sscanf(opt_string, "sectors_per_bit:%llu%c", &llval, &dummy) == 1) {
3679                         log2_sectors_per_bitmap_bit = !llval ? 0 : __ilog2_u64(llval);
3680                 } else if (sscanf(opt_string, "bitmap_flush_interval:%u%c", &val, &dummy) == 1) {
3681                         if (val >= (uint64_t)UINT_MAX * 1000 / HZ) {
3682                                 r = -EINVAL;
3683                                 ti->error = "Invalid bitmap_flush_interval argument";
3684                         }
3685                         ic->bitmap_flush_interval = msecs_to_jiffies(val);
3686                 } else if (!strncmp(opt_string, "internal_hash:", strlen("internal_hash:"))) {
3687                         r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error,
3688                                             "Invalid internal_hash argument");
3689                         if (r)
3690                                 goto bad;
3691                 } else if (!strncmp(opt_string, "journal_crypt:", strlen("journal_crypt:"))) {
3692                         r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error,
3693                                             "Invalid journal_crypt argument");
3694                         if (r)
3695                                 goto bad;
3696                 } else if (!strncmp(opt_string, "journal_mac:", strlen("journal_mac:"))) {
3697                         r = get_alg_and_key(opt_string, &ic->journal_mac_alg,  &ti->error,
3698                                             "Invalid journal_mac argument");
3699                         if (r)
3700                                 goto bad;
3701                 } else if (!strcmp(opt_string, "recalculate")) {
3702                         ic->recalculate_flag = true;
3703                 } else {
3704                         r = -EINVAL;
3705                         ti->error = "Invalid argument";
3706                         goto bad;
3707                 }
3708         }
3709
3710         ic->data_device_sectors = i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT;
3711         if (!ic->meta_dev)
3712                 ic->meta_device_sectors = ic->data_device_sectors;
3713         else
3714                 ic->meta_device_sectors = i_size_read(ic->meta_dev->bdev->bd_inode) >> SECTOR_SHIFT;
3715
3716         if (!journal_sectors) {
3717                 journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS,
3718                                       ic->data_device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR);
3719         }
3720
3721         if (!buffer_sectors)
3722                 buffer_sectors = 1;
3723         ic->log2_buffer_sectors = min((int)__fls(buffer_sectors), 31 - SECTOR_SHIFT);
3724
3725         r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error,
3726                     "Invalid internal hash", "Error setting internal hash key");
3727         if (r)
3728                 goto bad;
3729
3730         r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error,
3731                     "Invalid journal mac", "Error setting journal mac key");
3732         if (r)
3733                 goto bad;
3734
3735         if (!ic->tag_size) {
3736                 if (!ic->internal_hash) {
3737                         ti->error = "Unknown tag size";
3738                         r = -EINVAL;
3739                         goto bad;
3740                 }
3741                 ic->tag_size = crypto_shash_digestsize(ic->internal_hash);
3742         }
3743         if (ic->tag_size > MAX_TAG_SIZE) {
3744                 ti->error = "Too big tag size";
3745                 r = -EINVAL;
3746                 goto bad;
3747         }
3748         if (!(ic->tag_size & (ic->tag_size - 1)))
3749                 ic->log2_tag_size = __ffs(ic->tag_size);
3750         else
3751                 ic->log2_tag_size = -1;
3752
3753         if (ic->mode == 'B' && !ic->internal_hash) {
3754                 r = -EINVAL;
3755                 ti->error = "Bitmap mode can be only used with internal hash";
3756                 goto bad;
3757         }
3758
3759         ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
3760         ic->autocommit_msec = sync_msec;
3761         timer_setup(&ic->autocommit_timer, autocommit_fn, 0);
3762
3763         ic->io = dm_io_client_create();
3764         if (IS_ERR(ic->io)) {
3765                 r = PTR_ERR(ic->io);
3766                 ic->io = NULL;
3767                 ti->error = "Cannot allocate dm io";
3768                 goto bad;
3769         }
3770
3771         r = mempool_init_slab_pool(&ic->journal_io_mempool, JOURNAL_IO_MEMPOOL, journal_io_cache);
3772         if (r) {
3773                 ti->error = "Cannot allocate mempool";
3774                 goto bad;
3775         }
3776
3777         ic->metadata_wq = alloc_workqueue("dm-integrity-metadata",
3778                                           WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE);
3779         if (!ic->metadata_wq) {
3780                 ti->error = "Cannot allocate workqueue";
3781                 r = -ENOMEM;
3782                 goto bad;
3783         }
3784
3785         /*
3786          * If this workqueue were percpu, it would cause bio reordering
3787          * and reduced performance.
3788          */
3789         ic->wait_wq = alloc_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3790         if (!ic->wait_wq) {
3791                 ti->error = "Cannot allocate workqueue";
3792                 r = -ENOMEM;
3793                 goto bad;
3794         }
3795
3796         ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1);
3797         if (!ic->commit_wq) {
3798                 ti->error = "Cannot allocate workqueue";
3799                 r = -ENOMEM;
3800                 goto bad;
3801         }
3802         INIT_WORK(&ic->commit_work, integrity_commit);
3803
3804         if (ic->mode == 'J' || ic->mode == 'B') {
3805                 ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1);
3806                 if (!ic->writer_wq) {
3807                         ti->error = "Cannot allocate workqueue";
3808                         r = -ENOMEM;
3809                         goto bad;
3810                 }
3811                 INIT_WORK(&ic->writer_work, integrity_writer);
3812         }
3813
3814         ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL);
3815         if (!ic->sb) {
3816                 r = -ENOMEM;
3817                 ti->error = "Cannot allocate superblock area";
3818                 goto bad;
3819         }
3820
3821         r = sync_rw_sb(ic, REQ_OP_READ, 0);
3822         if (r) {
3823                 ti->error = "Error reading superblock";
3824                 goto bad;
3825         }
3826         should_write_sb = false;
3827         if (memcmp(ic->sb->magic, SB_MAGIC, 8)) {
3828                 if (ic->mode != 'R') {
3829                         if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) {
3830                                 r = -EINVAL;
3831                                 ti->error = "The device is not initialized";
3832                                 goto bad;
3833                         }
3834                 }
3835
3836                 r = initialize_superblock(ic, journal_sectors, interleave_sectors);
3837                 if (r) {
3838                         ti->error = "Could not initialize superblock";
3839                         goto bad;
3840                 }
3841                 if (ic->mode != 'R')
3842                         should_write_sb = true;
3843         }
3844
3845         if (!ic->sb->version || ic->sb->version > SB_VERSION_3) {
3846                 r = -EINVAL;
3847                 ti->error = "Unknown version";
3848                 goto bad;
3849         }
3850         if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) {
3851                 r = -EINVAL;
3852                 ti->error = "Tag size doesn't match the information in superblock";
3853                 goto bad;
3854         }
3855         if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) {
3856                 r = -EINVAL;
3857                 ti->error = "Block size doesn't match the information in superblock";
3858                 goto bad;
3859         }
3860         if (!le32_to_cpu(ic->sb->journal_sections)) {
3861                 r = -EINVAL;
3862                 ti->error = "Corrupted superblock, journal_sections is 0";
3863                 goto bad;
3864         }
3865         /* make sure that ti->max_io_len doesn't overflow */
3866         if (!ic->meta_dev) {
3867                 if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS ||
3868                     ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) {
3869                         r = -EINVAL;
3870                         ti->error = "Invalid interleave_sectors in the superblock";
3871                         goto bad;
3872                 }
3873         } else {
3874                 if (ic->sb->log2_interleave_sectors) {
3875                         r = -EINVAL;
3876                         ti->error = "Invalid interleave_sectors in the superblock";
3877                         goto bad;
3878                 }
3879         }
3880         ic->provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
3881         if (ic->provided_data_sectors != le64_to_cpu(ic->sb->provided_data_sectors)) {
3882                 /* test for overflow */
3883                 r = -EINVAL;
3884                 ti->error = "The superblock has 64-bit device size, but the kernel was compiled with 32-bit sectors";
3885                 goto bad;
3886         }
3887         if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
3888                 r = -EINVAL;
3889                 ti->error = "Journal mac mismatch";
3890                 goto bad;
3891         }
3892
3893 try_smaller_buffer:
3894         r = calculate_device_limits(ic);
3895         if (r) {
3896                 if (ic->meta_dev) {
3897                         if (ic->log2_buffer_sectors > 3) {
3898                                 ic->log2_buffer_sectors--;
3899                                 goto try_smaller_buffer;
3900                         }
3901                 }
3902                 ti->error = "The device is too small";
3903                 goto bad;
3904         }
3905
3906         if (log2_sectors_per_bitmap_bit < 0)
3907                 log2_sectors_per_bitmap_bit = __fls(DEFAULT_SECTORS_PER_BITMAP_BIT);
3908         if (log2_sectors_per_bitmap_bit < ic->sb->log2_sectors_per_block)
3909                 log2_sectors_per_bitmap_bit = ic->sb->log2_sectors_per_block;
3910
3911         bits_in_journal = ((__u64)ic->journal_section_sectors * ic->journal_sections) << (SECTOR_SHIFT + 3);
3912         if (bits_in_journal > UINT_MAX)
3913                 bits_in_journal = UINT_MAX;
3914         while (bits_in_journal < (ic->provided_data_sectors + ((sector_t)1 << log2_sectors_per_bitmap_bit) - 1) >> log2_sectors_per_bitmap_bit)
3915                 log2_sectors_per_bitmap_bit++;
3916
3917         log2_blocks_per_bitmap_bit = log2_sectors_per_bitmap_bit - ic->sb->log2_sectors_per_block;
3918         ic->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
3919         if (should_write_sb) {
3920                 ic->sb->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
3921         }
3922         n_bitmap_bits = ((ic->provided_data_sectors >> ic->sb->log2_sectors_per_block)
3923                                 + (((sector_t)1 << log2_blocks_per_bitmap_bit) - 1)) >> log2_blocks_per_bitmap_bit;
3924         ic->n_bitmap_blocks = DIV_ROUND_UP(n_bitmap_bits, BITMAP_BLOCK_SIZE * 8);
3925
3926         if (!ic->meta_dev)
3927                 ic->log2_buffer_sectors = min(ic->log2_buffer_sectors, (__u8)__ffs(ic->metadata_run));
3928
3929         if (ti->len > ic->provided_data_sectors) {
3930                 r = -EINVAL;
3931                 ti->error = "Not enough provided sectors for requested mapping size";
3932                 goto bad;
3933         }
3934
3935
3936         threshold = (__u64)ic->journal_entries * (100 - journal_watermark);
3937         threshold += 50;
3938         do_div(threshold, 100);
3939         ic->free_sectors_threshold = threshold;
3940
3941         DEBUG_print("initialized:\n");
3942         DEBUG_print("   integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size));
3943         DEBUG_print("   journal_entry_size %u\n", ic->journal_entry_size);
3944         DEBUG_print("   journal_entries_per_sector %u\n", ic->journal_entries_per_sector);
3945         DEBUG_print("   journal_section_entries %u\n", ic->journal_section_entries);
3946         DEBUG_print("   journal_section_sectors %u\n", ic->journal_section_sectors);
3947         DEBUG_print("   journal_sections %u\n", (unsigned)le32_to_cpu(ic->sb->journal_sections));
3948         DEBUG_print("   journal_entries %u\n", ic->journal_entries);
3949         DEBUG_print("   log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors);
3950         DEBUG_print("   data_device_sectors 0x%llx\n", i_size_read(ic->dev->bdev->bd_inode) >> SECTOR_SHIFT);
3951         DEBUG_print("   initial_sectors 0x%x\n", ic->initial_sectors);
3952         DEBUG_print("   metadata_run 0x%x\n", ic->metadata_run);
3953         DEBUG_print("   log2_metadata_run %d\n", ic->log2_metadata_run);
3954         DEBUG_print("   provided_data_sectors 0x%llx (%llu)\n", (unsigned long long)ic->provided_data_sectors,
3955                     (unsigned long long)ic->provided_data_sectors);
3956         DEBUG_print("   log2_buffer_sectors %u\n", ic->log2_buffer_sectors);
3957         DEBUG_print("   bits_in_journal %llu\n", (unsigned long long)bits_in_journal);
3958
3959         if (ic->recalculate_flag && !(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))) {
3960                 ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3961                 ic->sb->recalc_sector = cpu_to_le64(0);
3962         }
3963
3964         if (ic->internal_hash) {
3965                 ic->recalc_wq = alloc_workqueue("dm-integrity-recalc", WQ_MEM_RECLAIM, 1);
3966                 if (!ic->recalc_wq ) {
3967                         ti->error = "Cannot allocate workqueue";
3968                         r = -ENOMEM;
3969                         goto bad;
3970                 }
3971                 INIT_WORK(&ic->recalc_work, integrity_recalc);
3972                 ic->recalc_buffer = vmalloc(RECALC_SECTORS << SECTOR_SHIFT);
3973                 if (!ic->recalc_buffer) {
3974                         ti->error = "Cannot allocate buffer for recalculating";
3975                         r = -ENOMEM;
3976                         goto bad;
3977                 }
3978                 ic->recalc_tags = kvmalloc_array(RECALC_SECTORS >> ic->sb->log2_sectors_per_block,
3979                                                  ic->tag_size, GFP_KERNEL);
3980                 if (!ic->recalc_tags) {
3981                         ti->error = "Cannot allocate tags for recalculating";
3982                         r = -ENOMEM;
3983                         goto bad;
3984                 }
3985         }
3986
3987         ic->bufio = dm_bufio_client_create(ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev,
3988                         1U << (SECTOR_SHIFT + ic->log2_buffer_sectors), 1, 0, NULL, NULL);
3989         if (IS_ERR(ic->bufio)) {
3990                 r = PTR_ERR(ic->bufio);
3991                 ti->error = "Cannot initialize dm-bufio";
3992                 ic->bufio = NULL;
3993                 goto bad;
3994         }
3995         dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors);
3996
3997         if (ic->mode != 'R') {
3998                 r = create_journal(ic, &ti->error);
3999                 if (r)
4000                         goto bad;
4001
4002         }
4003
4004         if (ic->mode == 'B') {
4005                 unsigned i;
4006                 unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
4007
4008                 ic->recalc_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4009                 if (!ic->recalc_bitmap) {
4010                         r = -ENOMEM;
4011                         goto bad;
4012                 }
4013                 ic->may_write_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4014                 if (!ic->may_write_bitmap) {
4015                         r = -ENOMEM;
4016                         goto bad;
4017                 }
4018                 ic->bbs = kvmalloc_array(ic->n_bitmap_blocks, sizeof(struct bitmap_block_status), GFP_KERNEL);
4019                 if (!ic->bbs) {
4020                         r = -ENOMEM;
4021                         goto bad;
4022                 }
4023                 INIT_DELAYED_WORK(&ic->bitmap_flush_work, bitmap_flush_work);
4024                 for (i = 0; i < ic->n_bitmap_blocks; i++) {
4025                         struct bitmap_block_status *bbs = &ic->bbs[i];
4026                         unsigned sector, pl_index, pl_offset;
4027
4028                         INIT_WORK(&bbs->work, bitmap_block_work);
4029                         bbs->ic = ic;
4030                         bbs->idx = i;
4031                         bio_list_init(&bbs->bio_queue);
4032                         spin_lock_init(&bbs->bio_queue_lock);
4033
4034                         sector = i * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT);
4035                         pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
4036                         pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
4037
4038                         bbs->bitmap = lowmem_page_address(ic->journal[pl_index].page) + pl_offset;
4039                 }
4040         }
4041
4042         if (should_write_sb) {
4043                 int r;
4044
4045                 init_journal(ic, 0, ic->journal_sections, 0);
4046                 r = dm_integrity_failed(ic);
4047                 if (unlikely(r)) {
4048                         ti->error = "Error initializing journal";
4049                         goto bad;
4050                 }
4051                 r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
4052                 if (r) {
4053                         ti->error = "Error initializing superblock";
4054                         goto bad;
4055                 }
4056                 ic->just_formatted = true;
4057         }
4058
4059         if (!ic->meta_dev) {
4060                 r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors);
4061                 if (r)
4062                         goto bad;
4063         }
4064         if (ic->mode == 'B') {
4065                 unsigned max_io_len = ((sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit) * (BITMAP_BLOCK_SIZE * 8);
4066                 if (!max_io_len)
4067                         max_io_len = 1U << 31;
4068                 DEBUG_print("max_io_len: old %u, new %u\n", ti->max_io_len, max_io_len);
4069                 if (!ti->max_io_len || ti->max_io_len > max_io_len) {
4070                         r = dm_set_target_max_io_len(ti, max_io_len);
4071                         if (r)
4072                                 goto bad;
4073                 }
4074         }
4075
4076         if (!ic->internal_hash)
4077                 dm_integrity_set(ti, ic);
4078
4079         ti->num_flush_bios = 1;
4080         ti->flush_supported = true;
4081
4082         return 0;
4083
4084 bad:
4085         dm_integrity_dtr(ti);
4086         return r;
4087 }
4088
4089 static void dm_integrity_dtr(struct dm_target *ti)
4090 {
4091         struct dm_integrity_c *ic = ti->private;
4092
4093         BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
4094         BUG_ON(!list_empty(&ic->wait_list));
4095
4096         if (ic->metadata_wq)
4097                 destroy_workqueue(ic->metadata_wq);
4098         if (ic->wait_wq)
4099                 destroy_workqueue(ic->wait_wq);
4100         if (ic->commit_wq)
4101                 destroy_workqueue(ic->commit_wq);
4102         if (ic->writer_wq)
4103                 destroy_workqueue(ic->writer_wq);
4104         if (ic->recalc_wq)
4105                 destroy_workqueue(ic->recalc_wq);
4106         vfree(ic->recalc_buffer);
4107         kvfree(ic->recalc_tags);
4108         kvfree(ic->bbs);
4109         if (ic->bufio)
4110                 dm_bufio_client_destroy(ic->bufio);
4111         mempool_exit(&ic->journal_io_mempool);
4112         if (ic->io)
4113                 dm_io_client_destroy(ic->io);
4114         if (ic->dev)
4115                 dm_put_device(ti, ic->dev);
4116         if (ic->meta_dev)
4117                 dm_put_device(ti, ic->meta_dev);
4118         dm_integrity_free_page_list(ic->journal);
4119         dm_integrity_free_page_list(ic->journal_io);
4120         dm_integrity_free_page_list(ic->journal_xor);
4121         dm_integrity_free_page_list(ic->recalc_bitmap);
4122         dm_integrity_free_page_list(ic->may_write_bitmap);
4123         if (ic->journal_scatterlist)
4124                 dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist);
4125         if (ic->journal_io_scatterlist)
4126                 dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist);
4127         if (ic->sk_requests) {
4128                 unsigned i;
4129
4130                 for (i = 0; i < ic->journal_sections; i++) {
4131                         struct skcipher_request *req = ic->sk_requests[i];
4132                         if (req) {
4133                                 kzfree(req->iv);
4134                                 skcipher_request_free(req);
4135                         }
4136                 }
4137                 kvfree(ic->sk_requests);
4138         }
4139         kvfree(ic->journal_tree);
4140         if (ic->sb)
4141                 free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT);
4142
4143         if (ic->internal_hash)
4144                 crypto_free_shash(ic->internal_hash);
4145         free_alg(&ic->internal_hash_alg);
4146
4147         if (ic->journal_crypt)
4148                 crypto_free_skcipher(ic->journal_crypt);
4149         free_alg(&ic->journal_crypt_alg);
4150
4151         if (ic->journal_mac)
4152                 crypto_free_shash(ic->journal_mac);
4153         free_alg(&ic->journal_mac_alg);
4154
4155         kfree(ic);
4156 }
4157
4158 static struct target_type integrity_target = {
4159         .name                   = "integrity",
4160         .version                = {1, 3, 0},
4161         .module                 = THIS_MODULE,
4162         .features               = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
4163         .ctr                    = dm_integrity_ctr,
4164         .dtr                    = dm_integrity_dtr,
4165         .map                    = dm_integrity_map,
4166         .postsuspend            = dm_integrity_postsuspend,
4167         .resume                 = dm_integrity_resume,
4168         .status                 = dm_integrity_status,
4169         .iterate_devices        = dm_integrity_iterate_devices,
4170         .io_hints               = dm_integrity_io_hints,
4171 };
4172
4173 static int __init dm_integrity_init(void)
4174 {
4175         int r;
4176
4177         journal_io_cache = kmem_cache_create("integrity_journal_io",
4178                                              sizeof(struct journal_io), 0, 0, NULL);
4179         if (!journal_io_cache) {
4180                 DMERR("can't allocate journal io cache");
4181                 return -ENOMEM;
4182         }
4183
4184         r = dm_register_target(&integrity_target);
4185
4186         if (r < 0)
4187                 DMERR("register failed %d", r);
4188
4189         return r;
4190 }
4191
4192 static void __exit dm_integrity_exit(void)
4193 {
4194         dm_unregister_target(&integrity_target);
4195         kmem_cache_destroy(journal_io_cache);
4196 }
4197
4198 module_init(dm_integrity_init);
4199 module_exit(dm_integrity_exit);
4200
4201 MODULE_AUTHOR("Milan Broz");
4202 MODULE_AUTHOR("Mikulas Patocka");
4203 MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension");
4204 MODULE_LICENSE("GPL");