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