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