1/*
   2 * Copyright (C) 2016-2017 Red Hat, Inc. All rights reserved.
   3 * Copyright (C) 2016-2017 Milan Broz
   4 * Copyright (C) 2016-2017 Mikulas Patocka
   5 *
   6 * This file is released under the GPL.
   7 */
   8
   9#include "dm-bio-record.h"
  10
  11#include <linux/compiler.h>
  12#include <linux/module.h>
  13#include <linux/device-mapper.h>
  14#include <linux/dm-io.h>
  15#include <linux/vmalloc.h>
  16#include <linux/sort.h>
  17#include <linux/rbtree.h>
  18#include <linux/delay.h>
  19#include <linux/random.h>
  20#include <linux/reboot.h>
  21#include <crypto/hash.h>
  22#include <crypto/skcipher.h>
  23#include <linux/async_tx.h>
  24#include <linux/dm-bufio.h>
  25
  26#include "dm-audit.h"
  27
  28#define DM_MSG_PREFIX "integrity"
  29
  30#define DEFAULT_INTERLEAVE_SECTORS	32768
  31#define DEFAULT_JOURNAL_SIZE_FACTOR	7
  32#define DEFAULT_SECTORS_PER_BITMAP_BIT	32768
  33#define DEFAULT_BUFFER_SECTORS		128
  34#define DEFAULT_JOURNAL_WATERMARK	50
  35#define DEFAULT_SYNC_MSEC		10000
  36#define DEFAULT_MAX_JOURNAL_SECTORS	131072
  37#define MIN_LOG2_INTERLEAVE_SECTORS	3
  38#define MAX_LOG2_INTERLEAVE_SECTORS	31
  39#define METADATA_WORKQUEUE_MAX_ACTIVE	16
  40#define RECALC_SECTORS			32768
  41#define RECALC_WRITE_SUPER		16
  42#define BITMAP_BLOCK_SIZE		4096	/* don't change it */
  43#define BITMAP_FLUSH_INTERVAL		(10 * HZ)
  44#define DISCARD_FILLER			0xf6
  45#define SALT_SIZE			16
  46
  47/*
  48 * Warning - DEBUG_PRINT prints security-sensitive data to the log,
  49 * so it should not be enabled in the official kernel
  50 */
  51//#define DEBUG_PRINT
  52//#define INTERNAL_VERIFY
  53
  54/*
  55 * On disk structures
  56 */
  57
  58#define SB_MAGIC			"integrt"
  59#define SB_VERSION_1			1
  60#define SB_VERSION_2			2
  61#define SB_VERSION_3			3
  62#define SB_VERSION_4			4
  63#define SB_VERSION_5			5
  64#define SB_SECTORS			8
  65#define MAX_SECTORS_PER_BLOCK		8
  66
  67struct superblock {
  68	__u8 magic[8];
  69	__u8 version;
  70	__u8 log2_interleave_sectors;
  71	__le16 integrity_tag_size;
  72	__le32 journal_sections;
  73	__le64 provided_data_sectors;	/* userspace uses this value */
  74	__le32 flags;
  75	__u8 log2_sectors_per_block;
  76	__u8 log2_blocks_per_bitmap_bit;
  77	__u8 pad[2];
  78	__le64 recalc_sector;
  79	__u8 pad2[8];
  80	__u8 salt[SALT_SIZE];
  81};
  82
  83#define SB_FLAG_HAVE_JOURNAL_MAC	0x1
  84#define SB_FLAG_RECALCULATING		0x2
  85#define SB_FLAG_DIRTY_BITMAP		0x4
  86#define SB_FLAG_FIXED_PADDING		0x8
  87#define SB_FLAG_FIXED_HMAC		0x10
  88
  89#define	JOURNAL_ENTRY_ROUNDUP		8
  90
  91typedef __le64 commit_id_t;
  92#define JOURNAL_MAC_PER_SECTOR		8
  93
  94struct journal_entry {
  95	union {
  96		struct {
  97			__le32 sector_lo;
  98			__le32 sector_hi;
  99		} s;
 100		__le64 sector;
 101	} u;
 102	commit_id_t last_bytes[];
 103	/* __u8 tag[0]; */
 104};
 105
 106#define journal_entry_tag(ic, je)		((__u8 *)&(je)->last_bytes[(ic)->sectors_per_block])
 107
 108#if BITS_PER_LONG == 64
 109#define journal_entry_set_sector(je, x)		do { smp_wmb(); WRITE_ONCE((je)->u.sector, cpu_to_le64(x)); } while (0)
 110#else
 111#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)
 112#endif
 113#define journal_entry_get_sector(je)		le64_to_cpu((je)->u.sector)
 114#define journal_entry_is_unused(je)		((je)->u.s.sector_hi == cpu_to_le32(-1))
 115#define journal_entry_set_unused(je)		do { ((je)->u.s.sector_hi = cpu_to_le32(-1)); } while (0)
 116#define journal_entry_is_inprogress(je)		((je)->u.s.sector_hi == cpu_to_le32(-2))
 117#define journal_entry_set_inprogress(je)	do { ((je)->u.s.sector_hi = cpu_to_le32(-2)); } while (0)
 118
 119#define JOURNAL_BLOCK_SECTORS		8
 120#define JOURNAL_SECTOR_DATA		((1 << SECTOR_SHIFT) - sizeof(commit_id_t))
 121#define JOURNAL_MAC_SIZE		(JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS)
 122
 123struct journal_sector {
 124	struct_group(sectors,
 125		__u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR];
 126		__u8 mac[JOURNAL_MAC_PER_SECTOR];
 127	);
 128	commit_id_t commit_id;
 129};
 130
 131#define MAX_TAG_SIZE			(JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK]))
 132
 133#define METADATA_PADDING_SECTORS	8
 134
 135#define N_COMMIT_IDS			4
 136
 137static unsigned char prev_commit_seq(unsigned char seq)
 138{
 139	return (seq + N_COMMIT_IDS - 1) % N_COMMIT_IDS;
 140}
 141
 142static unsigned char next_commit_seq(unsigned char seq)
 143{
 144	return (seq + 1) % N_COMMIT_IDS;
 145}
 146
 147/*
 148 * In-memory structures
 149 */
 150
 151struct journal_node {
 152	struct rb_node node;
 153	sector_t sector;
 154};
 155
 156struct alg_spec {
 157	char *alg_string;
 158	char *key_string;
 159	__u8 *key;
 160	unsigned key_size;
 161};
 162
 163struct dm_integrity_c {
 164	struct dm_dev *dev;
 165	struct dm_dev *meta_dev;
 166	unsigned tag_size;
 167	__s8 log2_tag_size;
 168	sector_t start;
 169	mempool_t journal_io_mempool;
 170	struct dm_io_client *io;
 171	struct dm_bufio_client *bufio;
 172	struct workqueue_struct *metadata_wq;
 173	struct superblock *sb;
 174	unsigned journal_pages;
 175	unsigned n_bitmap_blocks;
 176
 177	struct page_list *journal;
 178	struct page_list *journal_io;
 179	struct page_list *journal_xor;
 180	struct page_list *recalc_bitmap;
 181	struct page_list *may_write_bitmap;
 182	struct bitmap_block_status *bbs;
 183	unsigned bitmap_flush_interval;
 184	int synchronous_mode;
 185	struct bio_list synchronous_bios;
 186	struct delayed_work bitmap_flush_work;
 187
 188	struct crypto_skcipher *journal_crypt;
 189	struct scatterlist **journal_scatterlist;
 190	struct scatterlist **journal_io_scatterlist;
 191	struct skcipher_request **sk_requests;
 192
 193	struct crypto_shash *journal_mac;
 194
 195	struct journal_node *journal_tree;
 196	struct rb_root journal_tree_root;
 197
 198	sector_t provided_data_sectors;
 199
 200	unsigned short journal_entry_size;
 201	unsigned char journal_entries_per_sector;
 202	unsigned char journal_section_entries;
 203	unsigned short journal_section_sectors;
 204	unsigned journal_sections;
 205	unsigned journal_entries;
 206	sector_t data_device_sectors;
 207	sector_t meta_device_sectors;
 208	unsigned initial_sectors;
 209	unsigned metadata_run;
 210	__s8 log2_metadata_run;
 211	__u8 log2_buffer_sectors;
 212	__u8 sectors_per_block;
 213	__u8 log2_blocks_per_bitmap_bit;
 214
 215	unsigned char mode;
 216
 217	int failed;
 218
 219	struct crypto_shash *internal_hash;
 220
 221	struct dm_target *ti;
 222
 223	/* these variables are locked with endio_wait.lock */
 224	struct rb_root in_progress;
 225	struct list_head wait_list;
 226	wait_queue_head_t endio_wait;
 227	struct workqueue_struct *wait_wq;
 228	struct workqueue_struct *offload_wq;
 229
 230	unsigned char commit_seq;
 231	commit_id_t commit_ids[N_COMMIT_IDS];
 232
 233	unsigned committed_section;
 234	unsigned n_committed_sections;
 235
 236	unsigned uncommitted_section;
 237	unsigned n_uncommitted_sections;
 238
 239	unsigned free_section;
 240	unsigned char free_section_entry;
 241	unsigned free_sectors;
 242
 243	unsigned free_sectors_threshold;
 244
 245	struct workqueue_struct *commit_wq;
 246	struct work_struct commit_work;
 247
 248	struct workqueue_struct *writer_wq;
 249	struct work_struct writer_work;
 250
 251	struct workqueue_struct *recalc_wq;
 252	struct work_struct recalc_work;
 253	u8 *recalc_buffer;
 254	u8 *recalc_tags;
 255
 256	struct bio_list flush_bio_list;
 257
 258	unsigned long autocommit_jiffies;
 259	struct timer_list autocommit_timer;
 260	unsigned autocommit_msec;
 261
 262	wait_queue_head_t copy_to_journal_wait;
 263
 264	struct completion crypto_backoff;
 265
 266	bool wrote_to_journal;
 267	bool journal_uptodate;
 268	bool just_formatted;
 269	bool recalculate_flag;
 270	bool reset_recalculate_flag;
 271	bool discard;
 272	bool fix_padding;
 273	bool fix_hmac;
 274	bool legacy_recalculate;
 275
 276	struct alg_spec internal_hash_alg;
 277	struct alg_spec journal_crypt_alg;
 278	struct alg_spec journal_mac_alg;
 279
 280	atomic64_t number_of_mismatches;
 281
 282	struct notifier_block reboot_notifier;
 283};
 284
 285struct dm_integrity_range {
 286	sector_t logical_sector;
 287	sector_t n_sectors;
 288	bool waiting;
 289	union {
 290		struct rb_node node;
 291		struct {
 292			struct task_struct *task;
 293			struct list_head wait_entry;
 294		};
 295	};
 296};
 297
 298struct dm_integrity_io {
 299	struct work_struct work;
 300
 301	struct dm_integrity_c *ic;
 302	enum req_op op;
 303	bool fua;
 304
 305	struct dm_integrity_range range;
 306
 307	sector_t metadata_block;
 308	unsigned metadata_offset;
 309
 310	atomic_t in_flight;
 311	blk_status_t bi_status;
 312
 313	struct completion *completion;
 314
 315	struct dm_bio_details bio_details;
 316};
 317
 318struct journal_completion {
 319	struct dm_integrity_c *ic;
 320	atomic_t in_flight;
 321	struct completion comp;
 322};
 323
 324struct journal_io {
 325	struct dm_integrity_range range;
 326	struct journal_completion *comp;
 327};
 328
 329struct bitmap_block_status {
 330	struct work_struct work;
 331	struct dm_integrity_c *ic;
 332	unsigned idx;
 333	unsigned long *bitmap;
 334	struct bio_list bio_queue;
 335	spinlock_t bio_queue_lock;
 336
 337};
 338
 339static struct kmem_cache *journal_io_cache;
 340
 341#define JOURNAL_IO_MEMPOOL	32
 342
 343#ifdef DEBUG_PRINT
 344#define DEBUG_print(x, ...)	printk(KERN_DEBUG x, ##__VA_ARGS__)
 345static void __DEBUG_bytes(__u8 *bytes, size_t len, const char *msg, ...)
 346{
 347	va_list args;
 348	va_start(args, msg);
 349	vprintk(msg, args);
 350	va_end(args);
 351	if (len)
 352		pr_cont(":");
 353	while (len) {
 354		pr_cont(" %02x", *bytes);
 355		bytes++;
 356		len--;
 357	}
 358	pr_cont("\n");
 359}
 360#define DEBUG_bytes(bytes, len, msg, ...)	__DEBUG_bytes(bytes, len, KERN_DEBUG msg, ##__VA_ARGS__)
 361#else
 362#define DEBUG_print(x, ...)			do { } while (0)
 363#define DEBUG_bytes(bytes, len, msg, ...)	do { } while (0)
 364#endif
 365
 366static void dm_integrity_prepare(struct request *rq)
 367{
 368}
 369
 370static void dm_integrity_complete(struct request *rq, unsigned int nr_bytes)
 371{
 372}
 373
 374/*
 375 * DM Integrity profile, protection is performed layer above (dm-crypt)
 376 */
 377static const struct blk_integrity_profile dm_integrity_profile = {
 378	.name			= "DM-DIF-EXT-TAG",
 379	.generate_fn		= NULL,
 380	.verify_fn		= NULL,
 381	.prepare_fn		= dm_integrity_prepare,
 382	.complete_fn		= dm_integrity_complete,
 383};
 384
 385static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map);
 386static void integrity_bio_wait(struct work_struct *w);
 387static void dm_integrity_dtr(struct dm_target *ti);
 388
 389static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err)
 390{
 391	if (err == -EILSEQ)
 392		atomic64_inc(&ic->number_of_mismatches);
 393	if (!cmpxchg(&ic->failed, 0, err))
 394		DMERR("Error on %s: %d", msg, err);
 395}
 396
 397static int dm_integrity_failed(struct dm_integrity_c *ic)
 398{
 399	return READ_ONCE(ic->failed);
 400}
 401
 402static bool dm_integrity_disable_recalculate(struct dm_integrity_c *ic)
 403{
 404	if (ic->legacy_recalculate)
 405		return false;
 406	if (!(ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) ?
 407	    ic->internal_hash_alg.key || ic->journal_mac_alg.key :
 408	    ic->internal_hash_alg.key && !ic->journal_mac_alg.key)
 409		return true;
 410	return false;
 411}
 412
 413static commit_id_t dm_integrity_commit_id(struct dm_integrity_c *ic, unsigned i,
 414					  unsigned j, unsigned char seq)
 415{
 416	/*
 417	 * Xor the number with section and sector, so that if a piece of
 418	 * journal is written at wrong place, it is detected.
 419	 */
 420	return ic->commit_ids[seq] ^ cpu_to_le64(((__u64)i << 32) ^ j);
 421}
 422
 423static void get_area_and_offset(struct dm_integrity_c *ic, sector_t data_sector,
 424				sector_t *area, sector_t *offset)
 425{
 426	if (!ic->meta_dev) {
 427		__u8 log2_interleave_sectors = ic->sb->log2_interleave_sectors;
 428		*area = data_sector >> log2_interleave_sectors;
 429		*offset = (unsigned)data_sector & ((1U << log2_interleave_sectors) - 1);
 430	} else {
 431		*area = 0;
 432		*offset = data_sector;
 433	}
 434}
 435
 436#define sector_to_block(ic, n)						\
 437do {									\
 438	BUG_ON((n) & (unsigned)((ic)->sectors_per_block - 1));		\
 439	(n) >>= (ic)->sb->log2_sectors_per_block;			\
 440} while (0)
 441
 442static __u64 get_metadata_sector_and_offset(struct dm_integrity_c *ic, sector_t area,
 443					    sector_t offset, unsigned *metadata_offset)
 444{
 445	__u64 ms;
 446	unsigned mo;
 447
 448	ms = area << ic->sb->log2_interleave_sectors;
 449	if (likely(ic->log2_metadata_run >= 0))
 450		ms += area << ic->log2_metadata_run;
 451	else
 452		ms += area * ic->metadata_run;
 453	ms >>= ic->log2_buffer_sectors;
 454
 455	sector_to_block(ic, offset);
 456
 457	if (likely(ic->log2_tag_size >= 0)) {
 458		ms += offset >> (SECTOR_SHIFT + ic->log2_buffer_sectors - ic->log2_tag_size);
 459		mo = (offset << ic->log2_tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
 460	} else {
 461		ms += (__u64)offset * ic->tag_size >> (SECTOR_SHIFT + ic->log2_buffer_sectors);
 462		mo = (offset * ic->tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1);
 463	}
 464	*metadata_offset = mo;
 465	return ms;
 466}
 467
 468static sector_t get_data_sector(struct dm_integrity_c *ic, sector_t area, sector_t offset)
 469{
 470	sector_t result;
 471
 472	if (ic->meta_dev)
 473		return offset;
 474
 475	result = area << ic->sb->log2_interleave_sectors;
 476	if (likely(ic->log2_metadata_run >= 0))
 477		result += (area + 1) << ic->log2_metadata_run;
 478	else
 479		result += (area + 1) * ic->metadata_run;
 480
 481	result += (sector_t)ic->initial_sectors + offset;
 482	result += ic->start;
 483
 484	return result;
 485}
 486
 487static void wraparound_section(struct dm_integrity_c *ic, unsigned *sec_ptr)
 488{
 489	if (unlikely(*sec_ptr >= ic->journal_sections))
 490		*sec_ptr -= ic->journal_sections;
 491}
 492
 493static void sb_set_version(struct dm_integrity_c *ic)
 494{
 495	if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC))
 496		ic->sb->version = SB_VERSION_5;
 497	else if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING))
 498		ic->sb->version = SB_VERSION_4;
 499	else if (ic->mode == 'B' || ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP))
 500		ic->sb->version = SB_VERSION_3;
 501	else if (ic->meta_dev || ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
 502		ic->sb->version = SB_VERSION_2;
 503	else
 504		ic->sb->version = SB_VERSION_1;
 505}
 506
 507static int sb_mac(struct dm_integrity_c *ic, bool wr)
 508{
 509	SHASH_DESC_ON_STACK(desc, ic->journal_mac);
 510	int r;
 511	unsigned size = crypto_shash_digestsize(ic->journal_mac);
 512
 513	if (sizeof(struct superblock) + size > 1 << SECTOR_SHIFT) {
 514		dm_integrity_io_error(ic, "digest is too long", -EINVAL);
 515		return -EINVAL;
 516	}
 517
 518	desc->tfm = ic->journal_mac;
 519
 520	r = crypto_shash_init(desc);
 521	if (unlikely(r < 0)) {
 522		dm_integrity_io_error(ic, "crypto_shash_init", r);
 523		return r;
 524	}
 525
 526	r = crypto_shash_update(desc, (__u8 *)ic->sb, (1 << SECTOR_SHIFT) - size);
 527	if (unlikely(r < 0)) {
 528		dm_integrity_io_error(ic, "crypto_shash_update", r);
 529		return r;
 530	}
 531
 532	if (likely(wr)) {
 533		r = crypto_shash_final(desc, (__u8 *)ic->sb + (1 << SECTOR_SHIFT) - size);
 534		if (unlikely(r < 0)) {
 535			dm_integrity_io_error(ic, "crypto_shash_final", r);
 536			return r;
 537		}
 538	} else {
 539		__u8 result[HASH_MAX_DIGESTSIZE];
 540		r = crypto_shash_final(desc, result);
 541		if (unlikely(r < 0)) {
 542			dm_integrity_io_error(ic, "crypto_shash_final", r);
 543			return r;
 544		}
 545		if (memcmp((__u8 *)ic->sb + (1 << SECTOR_SHIFT) - size, result, size)) {
 546			dm_integrity_io_error(ic, "superblock mac", -EILSEQ);
 547			dm_audit_log_target(DM_MSG_PREFIX, "mac-superblock", ic->ti, 0);
 548			return -EILSEQ;
 549		}
 550	}
 551
 552	return 0;
 553}
 554
 555static int sync_rw_sb(struct dm_integrity_c *ic, blk_opf_t opf)
 556{
 557	struct dm_io_request io_req;
 558	struct dm_io_region io_loc;
 559	const enum req_op op = opf & REQ_OP_MASK;
 560	int r;
 561
 562	io_req.bi_opf = opf;
 
 563	io_req.mem.type = DM_IO_KMEM;
 564	io_req.mem.ptr.addr = ic->sb;
 565	io_req.notify.fn = NULL;
 566	io_req.client = ic->io;
 567	io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
 568	io_loc.sector = ic->start;
 569	io_loc.count = SB_SECTORS;
 570
 571	if (op == REQ_OP_WRITE) {
 572		sb_set_version(ic);
 573		if (ic->journal_mac && ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
 574			r = sb_mac(ic, true);
 575			if (unlikely(r))
 576				return r;
 577		}
 578	}
 579
 580	r = dm_io(&io_req, 1, &io_loc, NULL);
 581	if (unlikely(r))
 582		return r;
 583
 584	if (op == REQ_OP_READ) {
 585		if (ic->mode != 'R' && ic->journal_mac && ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
 586			r = sb_mac(ic, false);
 587			if (unlikely(r))
 588				return r;
 589		}
 590	}
 591
 592	return 0;
 593}
 594
 595#define BITMAP_OP_TEST_ALL_SET		0
 596#define BITMAP_OP_TEST_ALL_CLEAR	1
 597#define BITMAP_OP_SET			2
 598#define BITMAP_OP_CLEAR			3
 599
 600static bool block_bitmap_op(struct dm_integrity_c *ic, struct page_list *bitmap,
 601			    sector_t sector, sector_t n_sectors, int mode)
 602{
 603	unsigned long bit, end_bit, this_end_bit, page, end_page;
 604	unsigned long *data;
 605
 606	if (unlikely(((sector | n_sectors) & ((1 << ic->sb->log2_sectors_per_block) - 1)) != 0)) {
 607		DMCRIT("invalid bitmap access (%llx,%llx,%d,%d,%d)",
 608			sector,
 609			n_sectors,
 610			ic->sb->log2_sectors_per_block,
 611			ic->log2_blocks_per_bitmap_bit,
 612			mode);
 613		BUG();
 614	}
 615
 616	if (unlikely(!n_sectors))
 617		return true;
 618
 619	bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 620	end_bit = (sector + n_sectors - 1) >>
 621		(ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 622
 623	page = bit / (PAGE_SIZE * 8);
 624	bit %= PAGE_SIZE * 8;
 625
 626	end_page = end_bit / (PAGE_SIZE * 8);
 627	end_bit %= PAGE_SIZE * 8;
 628
 629repeat:
 630	if (page < end_page) {
 631		this_end_bit = PAGE_SIZE * 8 - 1;
 632	} else {
 633		this_end_bit = end_bit;
 634	}
 635
 636	data = lowmem_page_address(bitmap[page].page);
 637
 638	if (mode == BITMAP_OP_TEST_ALL_SET) {
 639		while (bit <= this_end_bit) {
 640			if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 641				do {
 642					if (data[bit / BITS_PER_LONG] != -1)
 643						return false;
 644					bit += BITS_PER_LONG;
 645				} while (this_end_bit >= bit + BITS_PER_LONG - 1);
 646				continue;
 647			}
 648			if (!test_bit(bit, data))
 649				return false;
 650			bit++;
 651		}
 652	} else if (mode == BITMAP_OP_TEST_ALL_CLEAR) {
 653		while (bit <= this_end_bit) {
 654			if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 655				do {
 656					if (data[bit / BITS_PER_LONG] != 0)
 657						return false;
 658					bit += BITS_PER_LONG;
 659				} while (this_end_bit >= bit + BITS_PER_LONG - 1);
 660				continue;
 661			}
 662			if (test_bit(bit, data))
 663				return false;
 664			bit++;
 665		}
 666	} else if (mode == BITMAP_OP_SET) {
 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] = -1;
 671					bit += BITS_PER_LONG;
 672				} while (this_end_bit >= bit + BITS_PER_LONG - 1);
 673				continue;
 674			}
 675			__set_bit(bit, data);
 676			bit++;
 677		}
 678	} else if (mode == BITMAP_OP_CLEAR) {
 679		if (!bit && this_end_bit == PAGE_SIZE * 8 - 1)
 680			clear_page(data);
 681		else while (bit <= this_end_bit) {
 682			if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) {
 683				do {
 684					data[bit / BITS_PER_LONG] = 0;
 685					bit += BITS_PER_LONG;
 686				} while (this_end_bit >= bit + BITS_PER_LONG - 1);
 687				continue;
 688			}
 689			__clear_bit(bit, data);
 690			bit++;
 691		}
 692	} else {
 693		BUG();
 694	}
 695
 696	if (unlikely(page < end_page)) {
 697		bit = 0;
 698		page++;
 699		goto repeat;
 700	}
 701
 702	return true;
 703}
 704
 705static void block_bitmap_copy(struct dm_integrity_c *ic, struct page_list *dst, struct page_list *src)
 706{
 707	unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
 708	unsigned i;
 709
 710	for (i = 0; i < n_bitmap_pages; i++) {
 711		unsigned long *dst_data = lowmem_page_address(dst[i].page);
 712		unsigned long *src_data = lowmem_page_address(src[i].page);
 713		copy_page(dst_data, src_data);
 714	}
 715}
 716
 717static struct bitmap_block_status *sector_to_bitmap_block(struct dm_integrity_c *ic, sector_t sector)
 718{
 719	unsigned bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
 720	unsigned bitmap_block = bit / (BITMAP_BLOCK_SIZE * 8);
 721
 722	BUG_ON(bitmap_block >= ic->n_bitmap_blocks);
 723	return &ic->bbs[bitmap_block];
 724}
 725
 726static void access_journal_check(struct dm_integrity_c *ic, unsigned section, unsigned offset,
 727				 bool e, const char *function)
 728{
 729#if defined(CONFIG_DM_DEBUG) || defined(INTERNAL_VERIFY)
 730	unsigned limit = e ? ic->journal_section_entries : ic->journal_section_sectors;
 731
 732	if (unlikely(section >= ic->journal_sections) ||
 733	    unlikely(offset >= limit)) {
 734		DMCRIT("%s: invalid access at (%u,%u), limit (%u,%u)",
 735		       function, section, offset, ic->journal_sections, limit);
 736		BUG();
 737	}
 738#endif
 739}
 740
 741static void page_list_location(struct dm_integrity_c *ic, unsigned section, unsigned offset,
 742			       unsigned *pl_index, unsigned *pl_offset)
 743{
 744	unsigned sector;
 745
 746	access_journal_check(ic, section, offset, false, "page_list_location");
 747
 748	sector = section * ic->journal_section_sectors + offset;
 749
 750	*pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
 751	*pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
 752}
 753
 754static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl,
 755					       unsigned section, unsigned offset, unsigned *n_sectors)
 756{
 757	unsigned pl_index, pl_offset;
 758	char *va;
 759
 760	page_list_location(ic, section, offset, &pl_index, &pl_offset);
 761
 762	if (n_sectors)
 763		*n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT;
 764
 765	va = lowmem_page_address(pl[pl_index].page);
 766
 767	return (struct journal_sector *)(va + pl_offset);
 768}
 769
 770static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset)
 771{
 772	return access_page_list(ic, ic->journal, section, offset, NULL);
 773}
 774
 775static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned section, unsigned n)
 776{
 777	unsigned rel_sector, offset;
 778	struct journal_sector *js;
 779
 780	access_journal_check(ic, section, n, true, "access_journal_entry");
 781
 782	rel_sector = n % JOURNAL_BLOCK_SECTORS;
 783	offset = n / JOURNAL_BLOCK_SECTORS;
 784
 785	js = access_journal(ic, section, rel_sector);
 786	return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size);
 787}
 788
 789static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned section, unsigned n)
 790{
 791	n <<= ic->sb->log2_sectors_per_block;
 792
 793	n += JOURNAL_BLOCK_SECTORS;
 794
 795	access_journal_check(ic, section, n, false, "access_journal_data");
 796
 797	return access_journal(ic, section, n);
 798}
 799
 800static void section_mac(struct dm_integrity_c *ic, unsigned section, __u8 result[JOURNAL_MAC_SIZE])
 801{
 802	SHASH_DESC_ON_STACK(desc, ic->journal_mac);
 803	int r;
 804	unsigned j, size;
 805
 806	desc->tfm = ic->journal_mac;
 807
 808	r = crypto_shash_init(desc);
 809	if (unlikely(r < 0)) {
 810		dm_integrity_io_error(ic, "crypto_shash_init", r);
 811		goto err;
 812	}
 813
 814	if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
 815		__le64 section_le;
 816
 817		r = crypto_shash_update(desc, (__u8 *)&ic->sb->salt, SALT_SIZE);
 818		if (unlikely(r < 0)) {
 819			dm_integrity_io_error(ic, "crypto_shash_update", r);
 820			goto err;
 821		}
 822
 823		section_le = cpu_to_le64(section);
 824		r = crypto_shash_update(desc, (__u8 *)&section_le, sizeof section_le);
 825		if (unlikely(r < 0)) {
 826			dm_integrity_io_error(ic, "crypto_shash_update", r);
 827			goto err;
 828		}
 829	}
 830
 831	for (j = 0; j < ic->journal_section_entries; j++) {
 832		struct journal_entry *je = access_journal_entry(ic, section, j);
 833		r = crypto_shash_update(desc, (__u8 *)&je->u.sector, sizeof je->u.sector);
 834		if (unlikely(r < 0)) {
 835			dm_integrity_io_error(ic, "crypto_shash_update", r);
 836			goto err;
 837		}
 838	}
 839
 840	size = crypto_shash_digestsize(ic->journal_mac);
 841
 842	if (likely(size <= JOURNAL_MAC_SIZE)) {
 843		r = crypto_shash_final(desc, result);
 844		if (unlikely(r < 0)) {
 845			dm_integrity_io_error(ic, "crypto_shash_final", r);
 846			goto err;
 847		}
 848		memset(result + size, 0, JOURNAL_MAC_SIZE - size);
 849	} else {
 850		__u8 digest[HASH_MAX_DIGESTSIZE];
 851
 852		if (WARN_ON(size > sizeof(digest))) {
 853			dm_integrity_io_error(ic, "digest_size", -EINVAL);
 854			goto err;
 855		}
 856		r = crypto_shash_final(desc, digest);
 857		if (unlikely(r < 0)) {
 858			dm_integrity_io_error(ic, "crypto_shash_final", r);
 859			goto err;
 860		}
 861		memcpy(result, digest, JOURNAL_MAC_SIZE);
 862	}
 863
 864	return;
 865err:
 866	memset(result, 0, JOURNAL_MAC_SIZE);
 867}
 868
 869static void rw_section_mac(struct dm_integrity_c *ic, unsigned section, bool wr)
 870{
 871	__u8 result[JOURNAL_MAC_SIZE];
 872	unsigned j;
 873
 874	if (!ic->journal_mac)
 875		return;
 876
 877	section_mac(ic, section, result);
 878
 879	for (j = 0; j < JOURNAL_BLOCK_SECTORS; j++) {
 880		struct journal_sector *js = access_journal(ic, section, j);
 881
 882		if (likely(wr))
 883			memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR);
 884		else {
 885			if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR)) {
 886				dm_integrity_io_error(ic, "journal mac", -EILSEQ);
 887				dm_audit_log_target(DM_MSG_PREFIX, "mac-journal", ic->ti, 0);
 888			}
 889		}
 890	}
 891}
 892
 893static void complete_journal_op(void *context)
 894{
 895	struct journal_completion *comp = context;
 896	BUG_ON(!atomic_read(&comp->in_flight));
 897	if (likely(atomic_dec_and_test(&comp->in_flight)))
 898		complete(&comp->comp);
 899}
 900
 901static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
 902			unsigned n_sections, struct journal_completion *comp)
 903{
 904	struct async_submit_ctl submit;
 905	size_t n_bytes = (size_t)(n_sections * ic->journal_section_sectors) << SECTOR_SHIFT;
 906	unsigned pl_index, pl_offset, section_index;
 907	struct page_list *source_pl, *target_pl;
 908
 909	if (likely(encrypt)) {
 910		source_pl = ic->journal;
 911		target_pl = ic->journal_io;
 912	} else {
 913		source_pl = ic->journal_io;
 914		target_pl = ic->journal;
 915	}
 916
 917	page_list_location(ic, section, 0, &pl_index, &pl_offset);
 918
 919	atomic_add(roundup(pl_offset + n_bytes, PAGE_SIZE) >> PAGE_SHIFT, &comp->in_flight);
 920
 921	init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, complete_journal_op, comp, NULL);
 922
 923	section_index = pl_index;
 924
 925	do {
 926		size_t this_step;
 927		struct page *src_pages[2];
 928		struct page *dst_page;
 929
 930		while (unlikely(pl_index == section_index)) {
 931			unsigned dummy;
 932			if (likely(encrypt))
 933				rw_section_mac(ic, section, true);
 934			section++;
 935			n_sections--;
 936			if (!n_sections)
 937				break;
 938			page_list_location(ic, section, 0, &section_index, &dummy);
 939		}
 940
 941		this_step = min(n_bytes, (size_t)PAGE_SIZE - pl_offset);
 942		dst_page = target_pl[pl_index].page;
 943		src_pages[0] = source_pl[pl_index].page;
 944		src_pages[1] = ic->journal_xor[pl_index].page;
 945
 946		async_xor(dst_page, src_pages, pl_offset, 2, this_step, &submit);
 947
 948		pl_index++;
 949		pl_offset = 0;
 950		n_bytes -= this_step;
 951	} while (n_bytes);
 952
 953	BUG_ON(n_sections);
 954
 955	async_tx_issue_pending_all();
 956}
 957
 958static void complete_journal_encrypt(struct crypto_async_request *req, int err)
 959{
 960	struct journal_completion *comp = req->data;
 961	if (unlikely(err)) {
 962		if (likely(err == -EINPROGRESS)) {
 963			complete(&comp->ic->crypto_backoff);
 964			return;
 965		}
 966		dm_integrity_io_error(comp->ic, "asynchronous encrypt", err);
 967	}
 968	complete_journal_op(comp);
 969}
 970
 971static bool do_crypt(bool encrypt, struct skcipher_request *req, struct journal_completion *comp)
 972{
 973	int r;
 974	skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
 975				      complete_journal_encrypt, comp);
 976	if (likely(encrypt))
 977		r = crypto_skcipher_encrypt(req);
 978	else
 979		r = crypto_skcipher_decrypt(req);
 980	if (likely(!r))
 981		return false;
 982	if (likely(r == -EINPROGRESS))
 983		return true;
 984	if (likely(r == -EBUSY)) {
 985		wait_for_completion(&comp->ic->crypto_backoff);
 986		reinit_completion(&comp->ic->crypto_backoff);
 987		return true;
 988	}
 989	dm_integrity_io_error(comp->ic, "encrypt", r);
 990	return false;
 991}
 992
 993static void crypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
 994			  unsigned n_sections, struct journal_completion *comp)
 995{
 996	struct scatterlist **source_sg;
 997	struct scatterlist **target_sg;
 998
 999	atomic_add(2, &comp->in_flight);
1000
1001	if (likely(encrypt)) {
1002		source_sg = ic->journal_scatterlist;
1003		target_sg = ic->journal_io_scatterlist;
1004	} else {
1005		source_sg = ic->journal_io_scatterlist;
1006		target_sg = ic->journal_scatterlist;
1007	}
1008
1009	do {
1010		struct skcipher_request *req;
1011		unsigned ivsize;
1012		char *iv;
1013
1014		if (likely(encrypt))
1015			rw_section_mac(ic, section, true);
1016
1017		req = ic->sk_requests[section];
1018		ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
1019		iv = req->iv;
1020
1021		memcpy(iv, iv + ivsize, ivsize);
1022
1023		req->src = source_sg[section];
1024		req->dst = target_sg[section];
1025
1026		if (unlikely(do_crypt(encrypt, req, comp)))
1027			atomic_inc(&comp->in_flight);
1028
1029		section++;
1030		n_sections--;
1031	} while (n_sections);
1032
1033	atomic_dec(&comp->in_flight);
1034	complete_journal_op(comp);
1035}
1036
1037static void encrypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned section,
1038			    unsigned n_sections, struct journal_completion *comp)
1039{
1040	if (ic->journal_xor)
1041		return xor_journal(ic, encrypt, section, n_sections, comp);
1042	else
1043		return crypt_journal(ic, encrypt, section, n_sections, comp);
1044}
1045
1046static void complete_journal_io(unsigned long error, void *context)
1047{
1048	struct journal_completion *comp = context;
1049	if (unlikely(error != 0))
1050		dm_integrity_io_error(comp->ic, "writing journal", -EIO);
1051	complete_journal_op(comp);
1052}
1053
1054static void rw_journal_sectors(struct dm_integrity_c *ic, blk_opf_t opf,
1055			       unsigned sector, unsigned n_sectors,
1056			       struct journal_completion *comp)
1057{
1058	struct dm_io_request io_req;
1059	struct dm_io_region io_loc;
1060	unsigned pl_index, pl_offset;
1061	int r;
1062
1063	if (unlikely(dm_integrity_failed(ic))) {
1064		if (comp)
1065			complete_journal_io(-1UL, comp);
1066		return;
1067	}
1068
1069	pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
1070	pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
1071
1072	io_req.bi_opf = opf;
 
1073	io_req.mem.type = DM_IO_PAGE_LIST;
1074	if (ic->journal_io)
1075		io_req.mem.ptr.pl = &ic->journal_io[pl_index];
1076	else
1077		io_req.mem.ptr.pl = &ic->journal[pl_index];
1078	io_req.mem.offset = pl_offset;
1079	if (likely(comp != NULL)) {
1080		io_req.notify.fn = complete_journal_io;
1081		io_req.notify.context = comp;
1082	} else {
1083		io_req.notify.fn = NULL;
1084	}
1085	io_req.client = ic->io;
1086	io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev;
1087	io_loc.sector = ic->start + SB_SECTORS + sector;
1088	io_loc.count = n_sectors;
1089
1090	r = dm_io(&io_req, 1, &io_loc, NULL);
1091	if (unlikely(r)) {
1092		dm_integrity_io_error(ic, (opf & REQ_OP_MASK) == REQ_OP_READ ?
1093				      "reading journal" : "writing journal", r);
1094		if (comp) {
1095			WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
1096			complete_journal_io(-1UL, comp);
1097		}
1098	}
1099}
1100
1101static void rw_journal(struct dm_integrity_c *ic, blk_opf_t opf,
1102		       unsigned section, unsigned n_sections,
1103		       struct journal_completion *comp)
1104{
1105	unsigned sector, n_sectors;
1106
1107	sector = section * ic->journal_section_sectors;
1108	n_sectors = n_sections * ic->journal_section_sectors;
1109
1110	rw_journal_sectors(ic, opf, sector, n_sectors, comp);
1111}
1112
1113static void write_journal(struct dm_integrity_c *ic, unsigned commit_start, unsigned commit_sections)
1114{
1115	struct journal_completion io_comp;
1116	struct journal_completion crypt_comp_1;
1117	struct journal_completion crypt_comp_2;
1118	unsigned i;
1119
1120	io_comp.ic = ic;
1121	init_completion(&io_comp.comp);
1122
1123	if (commit_start + commit_sections <= ic->journal_sections) {
1124		io_comp.in_flight = (atomic_t)ATOMIC_INIT(1);
1125		if (ic->journal_io) {
1126			crypt_comp_1.ic = ic;
1127			init_completion(&crypt_comp_1.comp);
1128			crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1129			encrypt_journal(ic, true, commit_start, commit_sections, &crypt_comp_1);
1130			wait_for_completion_io(&crypt_comp_1.comp);
1131		} else {
1132			for (i = 0; i < commit_sections; i++)
1133				rw_section_mac(ic, commit_start + i, true);
1134		}
1135		rw_journal(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, commit_start,
1136			   commit_sections, &io_comp);
1137	} else {
1138		unsigned to_end;
1139		io_comp.in_flight = (atomic_t)ATOMIC_INIT(2);
1140		to_end = ic->journal_sections - commit_start;
1141		if (ic->journal_io) {
1142			crypt_comp_1.ic = ic;
1143			init_completion(&crypt_comp_1.comp);
1144			crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1145			encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1);
1146			if (try_wait_for_completion(&crypt_comp_1.comp)) {
1147				rw_journal(ic, REQ_OP_WRITE | REQ_FUA,
1148					   commit_start, to_end, &io_comp);
1149				reinit_completion(&crypt_comp_1.comp);
1150				crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0);
1151				encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1);
1152				wait_for_completion_io(&crypt_comp_1.comp);
1153			} else {
1154				crypt_comp_2.ic = ic;
1155				init_completion(&crypt_comp_2.comp);
1156				crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0);
1157				encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2);
1158				wait_for_completion_io(&crypt_comp_1.comp);
1159				rw_journal(ic, REQ_OP_WRITE | REQ_FUA, commit_start, to_end, &io_comp);
1160				wait_for_completion_io(&crypt_comp_2.comp);
1161			}
1162		} else {
1163			for (i = 0; i < to_end; i++)
1164				rw_section_mac(ic, commit_start + i, true);
1165			rw_journal(ic, REQ_OP_WRITE | REQ_FUA, commit_start, to_end, &io_comp);
1166			for (i = 0; i < commit_sections - to_end; i++)
1167				rw_section_mac(ic, i, true);
1168		}
1169		rw_journal(ic, REQ_OP_WRITE | REQ_FUA, 0, commit_sections - to_end, &io_comp);
1170	}
1171
1172	wait_for_completion_io(&io_comp.comp);
1173}
1174
1175static void copy_from_journal(struct dm_integrity_c *ic, unsigned section, unsigned offset,
1176			      unsigned n_sectors, sector_t target, io_notify_fn fn, void *data)
1177{
1178	struct dm_io_request io_req;
1179	struct dm_io_region io_loc;
1180	int r;
1181	unsigned sector, pl_index, pl_offset;
1182
1183	BUG_ON((target | n_sectors | offset) & (unsigned)(ic->sectors_per_block - 1));
1184
1185	if (unlikely(dm_integrity_failed(ic))) {
1186		fn(-1UL, data);
1187		return;
1188	}
1189
1190	sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset;
1191
1192	pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
1193	pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
1194
1195	io_req.bi_opf = REQ_OP_WRITE;
 
1196	io_req.mem.type = DM_IO_PAGE_LIST;
1197	io_req.mem.ptr.pl = &ic->journal[pl_index];
1198	io_req.mem.offset = pl_offset;
1199	io_req.notify.fn = fn;
1200	io_req.notify.context = data;
1201	io_req.client = ic->io;
1202	io_loc.bdev = ic->dev->bdev;
1203	io_loc.sector = target;
1204	io_loc.count = n_sectors;
1205
1206	r = dm_io(&io_req, 1, &io_loc, NULL);
1207	if (unlikely(r)) {
1208		WARN_ONCE(1, "asynchronous dm_io failed: %d", r);
1209		fn(-1UL, data);
1210	}
1211}
1212
1213static bool ranges_overlap(struct dm_integrity_range *range1, struct dm_integrity_range *range2)
1214{
1215	return range1->logical_sector < range2->logical_sector + range2->n_sectors &&
1216	       range1->logical_sector + range1->n_sectors > range2->logical_sector;
1217}
1218
1219static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range, bool check_waiting)
1220{
1221	struct rb_node **n = &ic->in_progress.rb_node;
1222	struct rb_node *parent;
1223
1224	BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned)(ic->sectors_per_block - 1));
1225
1226	if (likely(check_waiting)) {
1227		struct dm_integrity_range *range;
1228		list_for_each_entry(range, &ic->wait_list, wait_entry) {
1229			if (unlikely(ranges_overlap(range, new_range)))
1230				return false;
1231		}
1232	}
1233
1234	parent = NULL;
1235
1236	while (*n) {
1237		struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node);
1238
1239		parent = *n;
1240		if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector) {
1241			n = &range->node.rb_left;
1242		} else if (new_range->logical_sector >= range->logical_sector + range->n_sectors) {
1243			n = &range->node.rb_right;
1244		} else {
1245			return false;
1246		}
1247	}
1248
1249	rb_link_node(&new_range->node, parent, n);
1250	rb_insert_color(&new_range->node, &ic->in_progress);
1251
1252	return true;
1253}
1254
1255static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1256{
1257	rb_erase(&range->node, &ic->in_progress);
1258	while (unlikely(!list_empty(&ic->wait_list))) {
1259		struct dm_integrity_range *last_range =
1260			list_first_entry(&ic->wait_list, struct dm_integrity_range, wait_entry);
1261		struct task_struct *last_range_task;
1262		last_range_task = last_range->task;
1263		list_del(&last_range->wait_entry);
1264		if (!add_new_range(ic, last_range, false)) {
1265			last_range->task = last_range_task;
1266			list_add(&last_range->wait_entry, &ic->wait_list);
1267			break;
1268		}
1269		last_range->waiting = false;
1270		wake_up_process(last_range_task);
1271	}
1272}
1273
1274static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range)
1275{
1276	unsigned long flags;
1277
1278	spin_lock_irqsave(&ic->endio_wait.lock, flags);
1279	remove_range_unlocked(ic, range);
1280	spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1281}
1282
1283static void wait_and_add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1284{
1285	new_range->waiting = true;
1286	list_add_tail(&new_range->wait_entry, &ic->wait_list);
1287	new_range->task = current;
1288	do {
1289		__set_current_state(TASK_UNINTERRUPTIBLE);
1290		spin_unlock_irq(&ic->endio_wait.lock);
1291		io_schedule();
1292		spin_lock_irq(&ic->endio_wait.lock);
1293	} while (unlikely(new_range->waiting));
1294}
1295
1296static void add_new_range_and_wait(struct dm_integrity_c *ic, struct dm_integrity_range *new_range)
1297{
1298	if (unlikely(!add_new_range(ic, new_range, true)))
1299		wait_and_add_new_range(ic, new_range);
1300}
1301
1302static void init_journal_node(struct journal_node *node)
1303{
1304	RB_CLEAR_NODE(&node->node);
1305	node->sector = (sector_t)-1;
1306}
1307
1308static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector)
1309{
1310	struct rb_node **link;
1311	struct rb_node *parent;
1312
1313	node->sector = sector;
1314	BUG_ON(!RB_EMPTY_NODE(&node->node));
1315
1316	link = &ic->journal_tree_root.rb_node;
1317	parent = NULL;
1318
1319	while (*link) {
1320		struct journal_node *j;
1321		parent = *link;
1322		j = container_of(parent, struct journal_node, node);
1323		if (sector < j->sector)
1324			link = &j->node.rb_left;
1325		else
1326			link = &j->node.rb_right;
1327	}
1328
1329	rb_link_node(&node->node, parent, link);
1330	rb_insert_color(&node->node, &ic->journal_tree_root);
1331}
1332
1333static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node)
1334{
1335	BUG_ON(RB_EMPTY_NODE(&node->node));
1336	rb_erase(&node->node, &ic->journal_tree_root);
1337	init_journal_node(node);
1338}
1339
1340#define NOT_FOUND	(-1U)
1341
1342static unsigned find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector)
1343{
1344	struct rb_node *n = ic->journal_tree_root.rb_node;
1345	unsigned found = NOT_FOUND;
1346	*next_sector = (sector_t)-1;
1347	while (n) {
1348		struct journal_node *j = container_of(n, struct journal_node, node);
1349		if (sector == j->sector) {
1350			found = j - ic->journal_tree;
1351		}
1352		if (sector < j->sector) {
1353			*next_sector = j->sector;
1354			n = j->node.rb_left;
1355		} else {
1356			n = j->node.rb_right;
1357		}
1358	}
1359
1360	return found;
1361}
1362
1363static bool test_journal_node(struct dm_integrity_c *ic, unsigned pos, sector_t sector)
1364{
1365	struct journal_node *node, *next_node;
1366	struct rb_node *next;
1367
1368	if (unlikely(pos >= ic->journal_entries))
1369		return false;
1370	node = &ic->journal_tree[pos];
1371	if (unlikely(RB_EMPTY_NODE(&node->node)))
1372		return false;
1373	if (unlikely(node->sector != sector))
1374		return false;
1375
1376	next = rb_next(&node->node);
1377	if (unlikely(!next))
1378		return true;
1379
1380	next_node = container_of(next, struct journal_node, node);
1381	return next_node->sector != sector;
1382}
1383
1384static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node)
1385{
1386	struct rb_node *next;
1387	struct journal_node *next_node;
1388	unsigned next_section;
1389
1390	BUG_ON(RB_EMPTY_NODE(&node->node));
1391
1392	next = rb_next(&node->node);
1393	if (unlikely(!next))
1394		return false;
1395
1396	next_node = container_of(next, struct journal_node, node);
1397
1398	if (next_node->sector != node->sector)
1399		return false;
1400
1401	next_section = (unsigned)(next_node - ic->journal_tree) / ic->journal_section_entries;
1402	if (next_section >= ic->committed_section &&
1403	    next_section < ic->committed_section + ic->n_committed_sections)
1404		return true;
1405	if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections)
1406		return true;
1407
1408	return false;
1409}
1410
1411#define TAG_READ	0
1412#define TAG_WRITE	1
1413#define TAG_CMP		2
1414
1415static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block,
1416			       unsigned *metadata_offset, unsigned total_size, int op)
1417{
1418#define MAY_BE_FILLER		1
1419#define MAY_BE_HASH		2
1420	unsigned hash_offset = 0;
1421	unsigned may_be = MAY_BE_HASH | (ic->discard ? MAY_BE_FILLER : 0);
1422
1423	do {
1424		unsigned char *data, *dp;
1425		struct dm_buffer *b;
1426		unsigned to_copy;
1427		int r;
1428
1429		r = dm_integrity_failed(ic);
1430		if (unlikely(r))
1431			return r;
1432
1433		data = dm_bufio_read(ic->bufio, *metadata_block, &b);
1434		if (IS_ERR(data))
1435			return PTR_ERR(data);
1436
1437		to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size);
1438		dp = data + *metadata_offset;
1439		if (op == TAG_READ) {
1440			memcpy(tag, dp, to_copy);
1441		} else if (op == TAG_WRITE) {
1442			if (memcmp(dp, tag, to_copy)) {
1443				memcpy(dp, tag, to_copy);
1444				dm_bufio_mark_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy);
1445			}
1446		} else {
1447			/* e.g.: op == TAG_CMP */
1448
1449			if (likely(is_power_of_2(ic->tag_size))) {
1450				if (unlikely(memcmp(dp, tag, to_copy)))
1451					if (unlikely(!ic->discard) ||
1452					    unlikely(memchr_inv(dp, DISCARD_FILLER, to_copy) != NULL)) {
1453						goto thorough_test;
1454				}
1455			} else {
1456				unsigned i, ts;
1457thorough_test:
1458				ts = total_size;
1459
1460				for (i = 0; i < to_copy; i++, ts--) {
1461					if (unlikely(dp[i] != tag[i]))
1462						may_be &= ~MAY_BE_HASH;
1463					if (likely(dp[i] != DISCARD_FILLER))
1464						may_be &= ~MAY_BE_FILLER;
1465					hash_offset++;
1466					if (unlikely(hash_offset == ic->tag_size)) {
1467						if (unlikely(!may_be)) {
1468							dm_bufio_release(b);
1469							return ts;
1470						}
1471						hash_offset = 0;
1472						may_be = MAY_BE_HASH | (ic->discard ? MAY_BE_FILLER : 0);
1473					}
1474				}
1475			}
1476		}
1477		dm_bufio_release(b);
1478
1479		tag += to_copy;
1480		*metadata_offset += to_copy;
1481		if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) {
1482			(*metadata_block)++;
1483			*metadata_offset = 0;
1484		}
1485
1486		if (unlikely(!is_power_of_2(ic->tag_size))) {
1487			hash_offset = (hash_offset + to_copy) % ic->tag_size;
1488		}
1489
1490		total_size -= to_copy;
1491	} while (unlikely(total_size));
1492
1493	return 0;
1494#undef MAY_BE_FILLER
1495#undef MAY_BE_HASH
1496}
1497
1498struct flush_request {
1499	struct dm_io_request io_req;
1500	struct dm_io_region io_reg;
1501	struct dm_integrity_c *ic;
1502	struct completion comp;
1503};
1504
1505static void flush_notify(unsigned long error, void *fr_)
1506{
1507	struct flush_request *fr = fr_;
1508	if (unlikely(error != 0))
1509		dm_integrity_io_error(fr->ic, "flushing disk cache", -EIO);
1510	complete(&fr->comp);
1511}
1512
1513static void dm_integrity_flush_buffers(struct dm_integrity_c *ic, bool flush_data)
1514{
1515	int r;
1516
1517	struct flush_request fr;
1518
1519	if (!ic->meta_dev)
1520		flush_data = false;
1521	if (flush_data) {
1522		fr.io_req.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC,
1523		fr.io_req.mem.type = DM_IO_KMEM,
1524		fr.io_req.mem.ptr.addr = NULL,
1525		fr.io_req.notify.fn = flush_notify,
1526		fr.io_req.notify.context = &fr;
1527		fr.io_req.client = dm_bufio_get_dm_io_client(ic->bufio),
1528		fr.io_reg.bdev = ic->dev->bdev,
1529		fr.io_reg.sector = 0,
1530		fr.io_reg.count = 0,
1531		fr.ic = ic;
1532		init_completion(&fr.comp);
1533		r = dm_io(&fr.io_req, 1, &fr.io_reg, NULL);
1534		BUG_ON(r);
1535	}
1536
1537	r = dm_bufio_write_dirty_buffers(ic->bufio);
1538	if (unlikely(r))
1539		dm_integrity_io_error(ic, "writing tags", r);
1540
1541	if (flush_data)
1542		wait_for_completion(&fr.comp);
1543}
1544
1545static void sleep_on_endio_wait(struct dm_integrity_c *ic)
1546{
1547	DECLARE_WAITQUEUE(wait, current);
1548	__add_wait_queue(&ic->endio_wait, &wait);
1549	__set_current_state(TASK_UNINTERRUPTIBLE);
1550	spin_unlock_irq(&ic->endio_wait.lock);
1551	io_schedule();
1552	spin_lock_irq(&ic->endio_wait.lock);
1553	__remove_wait_queue(&ic->endio_wait, &wait);
1554}
1555
1556static void autocommit_fn(struct timer_list *t)
1557{
1558	struct dm_integrity_c *ic = from_timer(ic, t, autocommit_timer);
1559
1560	if (likely(!dm_integrity_failed(ic)))
1561		queue_work(ic->commit_wq, &ic->commit_work);
1562}
1563
1564static void schedule_autocommit(struct dm_integrity_c *ic)
1565{
1566	if (!timer_pending(&ic->autocommit_timer))
1567		mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies);
1568}
1569
1570static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1571{
1572	struct bio *bio;
1573	unsigned long flags;
1574
1575	spin_lock_irqsave(&ic->endio_wait.lock, flags);
1576	bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1577	bio_list_add(&ic->flush_bio_list, bio);
1578	spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1579
1580	queue_work(ic->commit_wq, &ic->commit_work);
1581}
1582
1583static void do_endio(struct dm_integrity_c *ic, struct bio *bio)
1584{
1585	int 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		spin_lock_irqsave(&ic->endio_wait.lock, flags);
1591		bio_list_add(&ic->synchronous_bios, bio);
1592		queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
1593		spin_unlock_irqrestore(&ic->endio_wait.lock, flags);
1594		return;
1595	}
1596	bio_endio(bio);
1597}
1598
1599static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio)
1600{
1601	struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1602
1603	if (unlikely(dio->fua) && likely(!bio->bi_status) && likely(!dm_integrity_failed(ic)))
1604		submit_flush_bio(ic, dio);
1605	else
1606		do_endio(ic, bio);
1607}
1608
1609static void dec_in_flight(struct dm_integrity_io *dio)
1610{
1611	if (atomic_dec_and_test(&dio->in_flight)) {
1612		struct dm_integrity_c *ic = dio->ic;
1613		struct bio *bio;
1614
1615		remove_range(ic, &dio->range);
1616
1617		if (dio->op == REQ_OP_WRITE || unlikely(dio->op == REQ_OP_DISCARD))
1618			schedule_autocommit(ic);
1619
1620		bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
1621
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
1635static 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
1649static 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 digest_size;
1656
1657	req->tfm = ic->internal_hash;
1658
1659	r = crypto_shash_init(req);
1660	if (unlikely(r < 0)) {
1661		dm_integrity_io_error(ic, "crypto_shash_init", r);
1662		goto failed;
1663	}
1664
1665	if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) {
1666		r = crypto_shash_update(req, (__u8 *)&ic->sb->salt, SALT_SIZE);
1667		if (unlikely(r < 0)) {
1668			dm_integrity_io_error(ic, "crypto_shash_update", r);
1669			goto failed;
1670		}
1671	}
1672
1673	r = crypto_shash_update(req, (const __u8 *)&sector_le, sizeof sector_le);
1674	if (unlikely(r < 0)) {
1675		dm_integrity_io_error(ic, "crypto_shash_update", r);
1676		goto failed;
1677	}
1678
1679	r = crypto_shash_update(req, data, ic->sectors_per_block << SECTOR_SHIFT);
1680	if (unlikely(r < 0)) {
1681		dm_integrity_io_error(ic, "crypto_shash_update", r);
1682		goto failed;
1683	}
1684
1685	r = crypto_shash_final(req, result);
1686	if (unlikely(r < 0)) {
1687		dm_integrity_io_error(ic, "crypto_shash_final", r);
1688		goto failed;
1689	}
1690
1691	digest_size = crypto_shash_digestsize(ic->internal_hash);
1692	if (unlikely(digest_size < ic->tag_size))
1693		memset(result + digest_size, 0, ic->tag_size - digest_size);
1694
1695	return;
1696
1697failed:
1698	/* this shouldn't happen anyway, the hash functions have no reason to fail */
1699	get_random_bytes(result, ic->tag_size);
1700}
1701
1702static 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 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 extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0;
1716		char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
1717		sector_t sector;
1718		unsigned 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			sector_t bi_sector = dio->bio_details.bi_iter.bi_sector;
1739			unsigned bi_size = dio->bio_details.bi_iter.bi_size;
1740			unsigned max_size = likely(checksums != checksums_onstack) ? PAGE_SIZE : HASH_MAX_DIGESTSIZE;
1741			unsigned max_blocks = max_size / ic->tag_size;
1742			memset(checksums, DISCARD_FILLER, max_size);
1743
1744			while (bi_size) {
1745				unsigned this_step_blocks = bi_size >> (SECTOR_SHIFT + ic->sb->log2_sectors_per_block);
1746				this_step_blocks = min(this_step_blocks, max_blocks);
1747				r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1748							this_step_blocks * ic->tag_size, TAG_WRITE);
1749				if (unlikely(r)) {
1750					if (likely(checksums != checksums_onstack))
1751						kfree(checksums);
1752					goto error;
1753				}
1754
1755				/*if (bi_size < this_step_blocks << (SECTOR_SHIFT + ic->sb->log2_sectors_per_block)) {
1756					printk("BUGG: bi_sector: %llx, bi_size: %u\n", bi_sector, bi_size);
1757					printk("BUGG: this_step_blocks: %u\n", this_step_blocks);
1758					BUG();
1759				}*/
1760				bi_size -= this_step_blocks << (SECTOR_SHIFT + ic->sb->log2_sectors_per_block);
1761				bi_sector += this_step_blocks << ic->sb->log2_sectors_per_block;
1762			}
1763
1764			if (likely(checksums != checksums_onstack))
1765				kfree(checksums);
1766			goto skip_io;
1767		}
1768
1769		sector = dio->range.logical_sector;
1770		sectors_to_process = dio->range.n_sectors;
1771
1772		__bio_for_each_segment(bv, bio, iter, dio->bio_details.bi_iter) {
1773			unsigned pos;
1774			char *mem, *checksums_ptr;
1775
1776again:
1777			mem = bvec_kmap_local(&bv);
1778			pos = 0;
1779			checksums_ptr = checksums;
1780			do {
1781				integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr);
1782				checksums_ptr += ic->tag_size;
1783				sectors_to_process -= ic->sectors_per_block;
1784				pos += ic->sectors_per_block << SECTOR_SHIFT;
1785				sector += ic->sectors_per_block;
1786			} while (pos < bv.bv_len && sectors_to_process && checksums != checksums_onstack);
1787			kunmap_local(mem);
1788
1789			r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset,
1790						checksums_ptr - checksums, dio->op == REQ_OP_READ ? TAG_CMP : TAG_WRITE);
1791			if (unlikely(r)) {
1792				if (r > 0) {
1793					sector_t s;
1794
1795					s = sector - ((r + ic->tag_size - 1) / ic->tag_size);
1796					DMERR_LIMIT("%pg: Checksum failed at sector 0x%llx",
1797						    bio->bi_bdev, s);
1798					r = -EILSEQ;
1799					atomic64_inc(&ic->number_of_mismatches);
1800					dm_audit_log_bio(DM_MSG_PREFIX, "integrity-checksum",
1801							 bio, s, 0);
1802				}
1803				if (likely(checksums != checksums_onstack))
1804					kfree(checksums);
1805				goto error;
1806			}
1807
1808			if (!sectors_to_process)
1809				break;
1810
1811			if (unlikely(pos < bv.bv_len)) {
1812				bv.bv_offset += pos;
1813				bv.bv_len -= pos;
1814				goto again;
1815			}
1816		}
1817
1818		if (likely(checksums != checksums_onstack))
1819			kfree(checksums);
1820	} else {
1821		struct bio_integrity_payload *bip = dio->bio_details.bi_integrity;
1822
1823		if (bip) {
1824			struct bio_vec biv;
1825			struct bvec_iter iter;
1826			unsigned data_to_process = dio->range.n_sectors;
1827			sector_to_block(ic, data_to_process);
1828			data_to_process *= ic->tag_size;
1829
1830			bip_for_each_vec(biv, bip, iter) {
1831				unsigned char *tag;
1832				unsigned this_len;
1833
1834				BUG_ON(PageHighMem(biv.bv_page));
1835				tag = bvec_virt(&biv);
1836				this_len = min(biv.bv_len, data_to_process);
1837				r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset,
1838							this_len, dio->op == REQ_OP_READ ? TAG_READ : TAG_WRITE);
1839				if (unlikely(r))
1840					goto error;
1841				data_to_process -= this_len;
1842				if (!data_to_process)
1843					break;
1844			}
1845		}
1846	}
1847skip_io:
1848	dec_in_flight(dio);
1849	return;
1850error:
1851	dio->bi_status = errno_to_blk_status(r);
1852	dec_in_flight(dio);
1853}
1854
1855static int dm_integrity_map(struct dm_target *ti, struct bio *bio)
1856{
1857	struct dm_integrity_c *ic = ti->private;
1858	struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
1859	struct bio_integrity_payload *bip;
1860
1861	sector_t area, offset;
1862
1863	dio->ic = ic;
1864	dio->bi_status = 0;
1865	dio->op = bio_op(bio);
1866
1867	if (unlikely(dio->op == REQ_OP_DISCARD)) {
1868		if (ti->max_io_len) {
1869			sector_t sec = dm_target_offset(ti, bio->bi_iter.bi_sector);
1870			unsigned log2_max_io_len = __fls(ti->max_io_len);
1871			sector_t start_boundary = sec >> log2_max_io_len;
1872			sector_t end_boundary = (sec + bio_sectors(bio) - 1) >> log2_max_io_len;
1873			if (start_boundary < end_boundary) {
1874				sector_t len = ti->max_io_len - (sec & (ti->max_io_len - 1));
1875				dm_accept_partial_bio(bio, len);
1876			}
1877		}
1878	}
1879
1880	if (unlikely(bio->bi_opf & REQ_PREFLUSH)) {
1881		submit_flush_bio(ic, dio);
1882		return DM_MAPIO_SUBMITTED;
1883	}
1884
1885	dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector);
1886	dio->fua = dio->op == REQ_OP_WRITE && bio->bi_opf & REQ_FUA;
1887	if (unlikely(dio->fua)) {
1888		/*
1889		 * Don't pass down the FUA flag because we have to flush
1890		 * disk cache anyway.
1891		 */
1892		bio->bi_opf &= ~REQ_FUA;
1893	}
1894	if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) {
1895		DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx",
1896		      dio->range.logical_sector, bio_sectors(bio),
1897		      ic->provided_data_sectors);
1898		return DM_MAPIO_KILL;
1899	}
1900	if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned)(ic->sectors_per_block - 1))) {
1901		DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x",
1902		      ic->sectors_per_block,
1903		      dio->range.logical_sector, bio_sectors(bio));
1904		return DM_MAPIO_KILL;
1905	}
1906
1907	if (ic->sectors_per_block > 1 && likely(dio->op != REQ_OP_DISCARD)) {
1908		struct bvec_iter iter;
1909		struct bio_vec bv;
1910		bio_for_each_segment(bv, bio, iter) {
1911			if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) {
1912				DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary",
1913					bv.bv_offset, bv.bv_len, ic->sectors_per_block);
1914				return DM_MAPIO_KILL;
1915			}
1916		}
1917	}
1918
1919	bip = bio_integrity(bio);
1920	if (!ic->internal_hash) {
1921		if (bip) {
1922			unsigned wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block;
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
1951static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
1952				 unsigned journal_section, unsigned journal_entry)
1953{
1954	struct dm_integrity_c *ic = dio->ic;
1955	sector_t logical_sector;
1956	unsigned 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);
1968retry_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 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((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 tag_todo = ic->tag_size;
2017				char *tag_ptr = journal_entry_tag(ic, je);
2018
2019				if (bip) do {
2020					struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter);
2021					unsigned tag_now = min(biv.bv_len, tag_todo);
2022					char *tag_addr;
2023					BUG_ON(PageHighMem(biv.bv_page));
2024					tag_addr = bvec_virt(&biv);
2025					if (likely(dio->op == REQ_OP_WRITE))
2026						memcpy(tag_ptr, tag_addr, tag_now);
2027					else
2028						memcpy(tag_addr, tag_ptr, tag_now);
2029					bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now);
2030					tag_ptr += tag_now;
2031					tag_todo -= tag_now;
2032				} while (unlikely(tag_todo)); else {
2033					if (likely(dio->op == REQ_OP_WRITE))
2034						memset(tag_ptr, 0, tag_todo);
2035				}
2036			}
2037
2038			if (likely(dio->op == REQ_OP_WRITE)) {
2039				struct journal_sector *js;
2040				unsigned s;
2041
2042				js = access_journal_data(ic, journal_section, journal_entry);
2043				memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT);
2044
2045				s = 0;
2046				do {
2047					je->last_bytes[s] = js[s].commit_id;
2048				} while (++s < ic->sectors_per_block);
2049
2050				if (ic->internal_hash) {
2051					unsigned digest_size = crypto_shash_digestsize(ic->internal_hash);
2052					if (unlikely(digest_size > ic->tag_size)) {
2053						char checksums_onstack[HASH_MAX_DIGESTSIZE];
2054						integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack);
2055						memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size);
2056					} else
2057						integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je));
2058				}
2059
2060				journal_entry_set_sector(je, logical_sector);
2061			}
2062			logical_sector += ic->sectors_per_block;
2063
2064			journal_entry++;
2065			if (unlikely(journal_entry == ic->journal_section_entries)) {
2066				journal_entry = 0;
2067				journal_section++;
2068				wraparound_section(ic, &journal_section);
2069			}
2070
2071			bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT;
2072		} while (bv.bv_len -= ic->sectors_per_block << SECTOR_SHIFT);
2073
2074		if (unlikely(dio->op == REQ_OP_READ))
2075			flush_dcache_page(bv.bv_page);
2076		kunmap_local(mem);
2077	} while (n_sectors);
2078
2079	if (likely(dio->op == REQ_OP_WRITE)) {
2080		smp_mb();
2081		if (unlikely(waitqueue_active(&ic->copy_to_journal_wait)))
2082			wake_up(&ic->copy_to_journal_wait);
2083		if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) {
2084			queue_work(ic->commit_wq, &ic->commit_work);
2085		} else {
2086			schedule_autocommit(ic);
2087		}
2088	} else {
2089		remove_range(ic, &dio->range);
2090	}
2091
2092	if (unlikely(bio->bi_iter.bi_size)) {
2093		sector_t area, offset;
2094
2095		dio->range.logical_sector = logical_sector;
2096		get_area_and_offset(ic, dio->range.logical_sector, &area, &offset);
2097		dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset);
2098		return true;
2099	}
2100
2101	return false;
2102}
2103
2104static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map)
2105{
2106	struct dm_integrity_c *ic = dio->ic;
2107	struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
2108	unsigned journal_section, journal_entry;
2109	unsigned journal_read_pos;
2110	struct completion read_comp;
2111	bool discard_retried = false;
2112	bool need_sync_io = ic->internal_hash && dio->op == REQ_OP_READ;
2113	if (unlikely(dio->op == REQ_OP_DISCARD) && ic->mode != 'D')
2114		need_sync_io = true;
2115
2116	if (need_sync_io && from_map) {
2117		INIT_WORK(&dio->work, integrity_bio_wait);
2118		queue_work(ic->offload_wq, &dio->work);
2119		return;
2120	}
2121
2122lock_retry:
2123	spin_lock_irq(&ic->endio_wait.lock);
2124retry:
2125	if (unlikely(dm_integrity_failed(ic))) {
2126		spin_unlock_irq(&ic->endio_wait.lock);
2127		do_endio(ic, bio);
2128		return;
2129	}
2130	dio->range.n_sectors = bio_sectors(bio);
2131	journal_read_pos = NOT_FOUND;
2132	if (ic->mode == 'J' && likely(dio->op != REQ_OP_DISCARD)) {
2133		if (dio->op == REQ_OP_WRITE) {
2134			unsigned next_entry, i, pos;
2135			unsigned ws, we, range_sectors;
2136
2137			dio->range.n_sectors = min(dio->range.n_sectors,
2138						   (sector_t)ic->free_sectors << ic->sb->log2_sectors_per_block);
2139			if (unlikely(!dio->range.n_sectors)) {
2140				if (from_map)
2141					goto offload_to_thread;
2142				sleep_on_endio_wait(ic);
2143				goto retry;
2144			}
2145			range_sectors = dio->range.n_sectors >> ic->sb->log2_sectors_per_block;
2146			ic->free_sectors -= range_sectors;
2147			journal_section = ic->free_section;
2148			journal_entry = ic->free_section_entry;
2149
2150			next_entry = ic->free_section_entry + range_sectors;
2151			ic->free_section_entry = next_entry % ic->journal_section_entries;
2152			ic->free_section += next_entry / ic->journal_section_entries;
2153			ic->n_uncommitted_sections += next_entry / ic->journal_section_entries;
2154			wraparound_section(ic, &ic->free_section);
2155
2156			pos = journal_section * ic->journal_section_entries + journal_entry;
2157			ws = journal_section;
2158			we = journal_entry;
2159			i = 0;
2160			do {
2161				struct journal_entry *je;
2162
2163				add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i);
2164				pos++;
2165				if (unlikely(pos >= ic->journal_entries))
2166					pos = 0;
2167
2168				je = access_journal_entry(ic, ws, we);
2169				BUG_ON(!journal_entry_is_unused(je));
2170				journal_entry_set_inprogress(je);
2171				we++;
2172				if (unlikely(we == ic->journal_section_entries)) {
2173					we = 0;
2174					ws++;
2175					wraparound_section(ic, &ws);
2176				}
2177			} while ((i += ic->sectors_per_block) < dio->range.n_sectors);
2178
2179			spin_unlock_irq(&ic->endio_wait.lock);
2180			goto journal_read_write;
2181		} else {
2182			sector_t next_sector;
2183			journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2184			if (likely(journal_read_pos == NOT_FOUND)) {
2185				if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector))
2186					dio->range.n_sectors = next_sector - dio->range.logical_sector;
2187			} else {
2188				unsigned i;
2189				unsigned jp = journal_read_pos + 1;
2190				for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) {
2191					if (!test_journal_node(ic, jp, dio->range.logical_sector + i))
2192						break;
2193				}
2194				dio->range.n_sectors = i;
2195			}
2196		}
2197	}
2198	if (unlikely(!add_new_range(ic, &dio->range, true))) {
2199		/*
2200		 * We must not sleep in the request routine because it could
2201		 * stall bios on current->bio_list.
2202		 * So, we offload the bio to a workqueue if we have to sleep.
2203		 */
2204		if (from_map) {
2205offload_to_thread:
2206			spin_unlock_irq(&ic->endio_wait.lock);
2207			INIT_WORK(&dio->work, integrity_bio_wait);
2208			queue_work(ic->wait_wq, &dio->work);
2209			return;
2210		}
2211		if (journal_read_pos != NOT_FOUND)
2212			dio->range.n_sectors = ic->sectors_per_block;
2213		wait_and_add_new_range(ic, &dio->range);
2214		/*
2215		 * wait_and_add_new_range drops the spinlock, so the journal
2216		 * may have been changed arbitrarily. We need to recheck.
2217		 * To simplify the code, we restrict I/O size to just one block.
2218		 */
2219		if (journal_read_pos != NOT_FOUND) {
2220			sector_t next_sector;
2221			unsigned new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2222			if (unlikely(new_pos != journal_read_pos)) {
2223				remove_range_unlocked(ic, &dio->range);
2224				goto retry;
2225			}
2226		}
2227	}
2228	if (ic->mode == 'J' && likely(dio->op == REQ_OP_DISCARD) && !discard_retried) {
2229		sector_t next_sector;
2230		unsigned new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector);
2231		if (unlikely(new_pos != NOT_FOUND) ||
2232		    unlikely(next_sector < dio->range.logical_sector - dio->range.n_sectors)) {
2233			remove_range_unlocked(ic, &dio->range);
2234			spin_unlock_irq(&ic->endio_wait.lock);
2235			queue_work(ic->commit_wq, &ic->commit_work);
2236			flush_workqueue(ic->commit_wq);
2237			queue_work(ic->writer_wq, &ic->writer_work);
2238			flush_workqueue(ic->writer_wq);
2239			discard_retried = true;
2240			goto lock_retry;
2241		}
2242	}
2243	spin_unlock_irq(&ic->endio_wait.lock);
2244
2245	if (unlikely(journal_read_pos != NOT_FOUND)) {
2246		journal_section = journal_read_pos / ic->journal_section_entries;
2247		journal_entry = journal_read_pos % ic->journal_section_entries;
2248		goto journal_read_write;
2249	}
2250
2251	if (ic->mode == 'B' && (dio->op == REQ_OP_WRITE || unlikely(dio->op == REQ_OP_DISCARD))) {
2252		if (!block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2253				     dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
2254			struct bitmap_block_status *bbs;
2255
2256			bbs = sector_to_bitmap_block(ic, dio->range.logical_sector);
2257			spin_lock(&bbs->bio_queue_lock);
2258			bio_list_add(&bbs->bio_queue, bio);
2259			spin_unlock(&bbs->bio_queue_lock);
2260			queue_work(ic->writer_wq, &bbs->work);
2261			return;
2262		}
2263	}
2264
2265	dio->in_flight = (atomic_t)ATOMIC_INIT(2);
2266
2267	if (need_sync_io) {
2268		init_completion(&read_comp);
2269		dio->completion = &read_comp;
2270	} else
2271		dio->completion = NULL;
2272
2273	dm_bio_record(&dio->bio_details, bio);
2274	bio_set_dev(bio, ic->dev->bdev);
2275	bio->bi_integrity = NULL;
2276	bio->bi_opf &= ~REQ_INTEGRITY;
2277	bio->bi_end_io = integrity_end_io;
2278	bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT;
2279
2280	if (unlikely(dio->op == REQ_OP_DISCARD) && likely(ic->mode != 'D')) {
2281		integrity_metadata(&dio->work);
2282		dm_integrity_flush_buffers(ic, false);
2283
2284		dio->in_flight = (atomic_t)ATOMIC_INIT(1);
2285		dio->completion = NULL;
2286
2287		submit_bio_noacct(bio);
2288
2289		return;
2290	}
2291
2292	submit_bio_noacct(bio);
2293
2294	if (need_sync_io) {
2295		wait_for_completion_io(&read_comp);
2296		if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
2297		    dio->range.logical_sector + dio->range.n_sectors > le64_to_cpu(ic->sb->recalc_sector))
2298			goto skip_check;
2299		if (ic->mode == 'B') {
2300			if (!block_bitmap_op(ic, ic->recalc_bitmap, dio->range.logical_sector,
2301					     dio->range.n_sectors, BITMAP_OP_TEST_ALL_CLEAR))
2302				goto skip_check;
2303		}
2304
2305		if (likely(!bio->bi_status))
2306			integrity_metadata(&dio->work);
2307		else
2308skip_check:
2309			dec_in_flight(dio);
2310
2311	} else {
2312		INIT_WORK(&dio->work, integrity_metadata);
2313		queue_work(ic->metadata_wq, &dio->work);
2314	}
2315
2316	return;
2317
2318journal_read_write:
2319	if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry)))
2320		goto lock_retry;
2321
2322	do_endio_flush(ic, dio);
2323}
2324
2325
2326static void integrity_bio_wait(struct work_struct *w)
2327{
2328	struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work);
2329
2330	dm_integrity_map_continue(dio, false);
2331}
2332
2333static void pad_uncommitted(struct dm_integrity_c *ic)
2334{
2335	if (ic->free_section_entry) {
2336		ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry;
2337		ic->free_section_entry = 0;
2338		ic->free_section++;
2339		wraparound_section(ic, &ic->free_section);
2340		ic->n_uncommitted_sections++;
2341	}
2342	if (WARN_ON(ic->journal_sections * ic->journal_section_entries !=
2343		    (ic->n_uncommitted_sections + ic->n_committed_sections) *
2344		    ic->journal_section_entries + ic->free_sectors)) {
2345		DMCRIT("journal_sections %u, journal_section_entries %u, "
2346		       "n_uncommitted_sections %u, n_committed_sections %u, "
2347		       "journal_section_entries %u, free_sectors %u",
2348		       ic->journal_sections, ic->journal_section_entries,
2349		       ic->n_uncommitted_sections, ic->n_committed_sections,
2350		       ic->journal_section_entries, ic->free_sectors);
2351	}
2352}
2353
2354static void integrity_commit(struct work_struct *w)
2355{
2356	struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work);
2357	unsigned commit_start, commit_sections;
2358	unsigned i, j, n;
2359	struct bio *flushes;
2360
2361	del_timer(&ic->autocommit_timer);
2362
2363	spin_lock_irq(&ic->endio_wait.lock);
2364	flushes = bio_list_get(&ic->flush_bio_list);
2365	if (unlikely(ic->mode != 'J')) {
2366		spin_unlock_irq(&ic->endio_wait.lock);
2367		dm_integrity_flush_buffers(ic, true);
2368		goto release_flush_bios;
2369	}
2370
2371	pad_uncommitted(ic);
2372	commit_start = ic->uncommitted_section;
2373	commit_sections = ic->n_uncommitted_sections;
2374	spin_unlock_irq(&ic->endio_wait.lock);
2375
2376	if (!commit_sections)
2377		goto release_flush_bios;
2378
2379	ic->wrote_to_journal = true;
2380
2381	i = commit_start;
2382	for (n = 0; n < commit_sections; n++) {
2383		for (j = 0; j < ic->journal_section_entries; j++) {
2384			struct journal_entry *je;
2385			je = access_journal_entry(ic, i, j);
2386			io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je));
2387		}
2388		for (j = 0; j < ic->journal_section_sectors; j++) {
2389			struct journal_sector *js;
2390			js = access_journal(ic, i, j);
2391			js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq);
2392		}
2393		i++;
2394		if (unlikely(i >= ic->journal_sections))
2395			ic->commit_seq = next_commit_seq(ic->commit_seq);
2396		wraparound_section(ic, &i);
2397	}
2398	smp_rmb();
2399
2400	write_journal(ic, commit_start, commit_sections);
2401
2402	spin_lock_irq(&ic->endio_wait.lock);
2403	ic->uncommitted_section += commit_sections;
2404	wraparound_section(ic, &ic->uncommitted_section);
2405	ic->n_uncommitted_sections -= commit_sections;
2406	ic->n_committed_sections += commit_sections;
2407	spin_unlock_irq(&ic->endio_wait.lock);
2408
2409	if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold)
2410		queue_work(ic->writer_wq, &ic->writer_work);
2411
2412release_flush_bios:
2413	while (flushes) {
2414		struct bio *next = flushes->bi_next;
2415		flushes->bi_next = NULL;
2416		do_endio(ic, flushes);
2417		flushes = next;
2418	}
2419}
2420
2421static void complete_copy_from_journal(unsigned long error, void *context)
2422{
2423	struct journal_io *io = context;
2424	struct journal_completion *comp = io->comp;
2425	struct dm_integrity_c *ic = comp->ic;
2426	remove_range(ic, &io->range);
2427	mempool_free(io, &ic->journal_io_mempool);
2428	if (unlikely(error != 0))
2429		dm_integrity_io_error(ic, "copying from journal", -EIO);
2430	complete_journal_op(comp);
2431}
2432
2433static void restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js,
2434			       struct journal_entry *je)
2435{
2436	unsigned s = 0;
2437	do {
2438		js->commit_id = je->last_bytes[s];
2439		js++;
2440	} while (++s < ic->sectors_per_block);
2441}
2442
2443static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start,
2444			     unsigned write_sections, bool from_replay)
2445{
2446	unsigned i, j, n;
2447	struct journal_completion comp;
2448	struct blk_plug plug;
2449
2450	blk_start_plug(&plug);
2451
2452	comp.ic = ic;
2453	comp.in_flight = (atomic_t)ATOMIC_INIT(1);
2454	init_completion(&comp.comp);
2455
2456	i = write_start;
2457	for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) {
2458#ifndef INTERNAL_VERIFY
2459		if (unlikely(from_replay))
2460#endif
2461			rw_section_mac(ic, i, false);
2462		for (j = 0; j < ic->journal_section_entries; j++) {
2463			struct journal_entry *je = access_journal_entry(ic, i, j);
2464			sector_t sec, area, offset;
2465			unsigned k, l, next_loop;
2466			sector_t metadata_block;
2467			unsigned metadata_offset;
2468			struct journal_io *io;
2469
2470			if (journal_entry_is_unused(je))
2471				continue;
2472			BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay);
2473			sec = journal_entry_get_sector(je);
2474			if (unlikely(from_replay)) {
2475				if (unlikely(sec & (unsigned)(ic->sectors_per_block - 1))) {
2476					dm_integrity_io_error(ic, "invalid sector in journal", -EIO);
2477					sec &= ~(sector_t)(ic->sectors_per_block - 1);
2478				}
2479				if (unlikely(sec >= ic->provided_data_sectors)) {
2480					journal_entry_set_unused(je);
2481					continue;
2482				}
2483			}
 
 
2484			get_area_and_offset(ic, sec, &area, &offset);
2485			restore_last_bytes(ic, access_journal_data(ic, i, j), je);
2486			for (k = j + 1; k < ic->journal_section_entries; k++) {
2487				struct journal_entry *je2 = access_journal_entry(ic, i, k);
2488				sector_t sec2, area2, offset2;
2489				if (journal_entry_is_unused(je2))
2490					break;
2491				BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay);
2492				sec2 = journal_entry_get_sector(je2);
2493				if (unlikely(sec2 >= ic->provided_data_sectors))
2494					break;
2495				get_area_and_offset(ic, sec2, &area2, &offset2);
2496				if (area2 != area || offset2 != offset + ((k - j) << ic->sb->log2_sectors_per_block))
2497					break;
2498				restore_last_bytes(ic, access_journal_data(ic, i, k), je2);
2499			}
2500			next_loop = k - 1;
2501
2502			io = mempool_alloc(&ic->journal_io_mempool, GFP_NOIO);
2503			io->comp = &comp;
2504			io->range.logical_sector = sec;
2505			io->range.n_sectors = (k - j) << ic->sb->log2_sectors_per_block;
2506
2507			spin_lock_irq(&ic->endio_wait.lock);
2508			add_new_range_and_wait(ic, &io->range);
2509
2510			if (likely(!from_replay)) {
2511				struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries];
2512
2513				/* don't write if there is newer committed sector */
2514				while (j < k && find_newer_committed_node(ic, &section_node[j])) {
2515					struct journal_entry *je2 = access_journal_entry(ic, i, j);
2516
2517					journal_entry_set_unused(je2);
2518					remove_journal_node(ic, &section_node[j]);
2519					j++;
2520					sec += ic->sectors_per_block;
2521					offset += ic->sectors_per_block;
2522				}
2523				while (j < k && find_newer_committed_node(ic, &section_node[k - 1])) {
2524					struct journal_entry *je2 = access_journal_entry(ic, i, k - 1);
2525
2526					journal_entry_set_unused(je2);
2527					remove_journal_node(ic, &section_node[k - 1]);
2528					k--;
2529				}
2530				if (j == k) {
2531					remove_range_unlocked(ic, &io->range);
2532					spin_unlock_irq(&ic->endio_wait.lock);
2533					mempool_free(io, &ic->journal_io_mempool);
2534					goto skip_io;
2535				}
2536				for (l = j; l < k; l++) {
2537					remove_journal_node(ic, &section_node[l]);
2538				}
2539			}
2540			spin_unlock_irq(&ic->endio_wait.lock);
2541
2542			metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2543			for (l = j; l < k; l++) {
2544				int r;
2545				struct journal_entry *je2 = access_journal_entry(ic, i, l);
2546
2547				if (
2548#ifndef INTERNAL_VERIFY
2549				    unlikely(from_replay) &&
2550#endif
2551				    ic->internal_hash) {
2552					char test_tag[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
2553
2554					integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block),
2555								  (char *)access_journal_data(ic, i, l), test_tag);
2556					if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size))) {
2557						dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ);
2558						dm_audit_log_target(DM_MSG_PREFIX, "integrity-replay-journal", ic->ti, 0);
2559					}
2560				}
2561
2562				journal_entry_set_unused(je2);
2563				r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset,
2564							ic->tag_size, TAG_WRITE);
2565				if (unlikely(r)) {
2566					dm_integrity_io_error(ic, "reading tags", r);
2567				}
2568			}
2569
2570			atomic_inc(&comp.in_flight);
2571			copy_from_journal(ic, i, j << ic->sb->log2_sectors_per_block,
2572					  (k - j) << ic->sb->log2_sectors_per_block,
2573					  get_data_sector(ic, area, offset),
2574					  complete_copy_from_journal, io);
2575skip_io:
2576			j = next_loop;
2577		}
2578	}
2579
2580	dm_bufio_write_dirty_buffers_async(ic->bufio);
2581
2582	blk_finish_plug(&plug);
2583
2584	complete_journal_op(&comp);
2585	wait_for_completion_io(&comp.comp);
2586
2587	dm_integrity_flush_buffers(ic, true);
2588}
2589
2590static void integrity_writer(struct work_struct *w)
2591{
2592	struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work);
2593	unsigned write_start, write_sections;
2594
2595	unsigned prev_free_sectors;
2596
 
 
 
 
2597	spin_lock_irq(&ic->endio_wait.lock);
2598	write_start = ic->committed_section;
2599	write_sections = ic->n_committed_sections;
2600	spin_unlock_irq(&ic->endio_wait.lock);
2601
2602	if (!write_sections)
2603		return;
2604
2605	do_journal_write(ic, write_start, write_sections, false);
2606
2607	spin_lock_irq(&ic->endio_wait.lock);
2608
2609	ic->committed_section += write_sections;
2610	wraparound_section(ic, &ic->committed_section);
2611	ic->n_committed_sections -= write_sections;
2612
2613	prev_free_sectors = ic->free_sectors;
2614	ic->free_sectors += write_sections * ic->journal_section_entries;
2615	if (unlikely(!prev_free_sectors))
2616		wake_up_locked(&ic->endio_wait);
2617
2618	spin_unlock_irq(&ic->endio_wait.lock);
2619}
2620
2621static void recalc_write_super(struct dm_integrity_c *ic)
2622{
2623	int r;
2624
2625	dm_integrity_flush_buffers(ic, false);
2626	if (dm_integrity_failed(ic))
2627		return;
2628
2629	r = sync_rw_sb(ic, REQ_OP_WRITE);
2630	if (unlikely(r))
2631		dm_integrity_io_error(ic, "writing superblock", r);
2632}
2633
2634static void integrity_recalc(struct work_struct *w)
2635{
2636	struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, recalc_work);
2637	struct dm_integrity_range range;
2638	struct dm_io_request io_req;
2639	struct dm_io_region io_loc;
2640	sector_t area, offset;
2641	sector_t metadata_block;
2642	unsigned metadata_offset;
2643	sector_t logical_sector, n_sectors;
2644	__u8 *t;
2645	unsigned i;
2646	int r;
2647	unsigned super_counter = 0;
2648
2649	DEBUG_print("start recalculation... (position %llx)\n", le64_to_cpu(ic->sb->recalc_sector));
2650
2651	spin_lock_irq(&ic->endio_wait.lock);
2652
2653next_chunk:
2654
2655	if (unlikely(dm_post_suspending(ic->ti)))
2656		goto unlock_ret;
2657
2658	range.logical_sector = le64_to_cpu(ic->sb->recalc_sector);
2659	if (unlikely(range.logical_sector >= ic->provided_data_sectors)) {
2660		if (ic->mode == 'B') {
2661			block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
2662			DEBUG_print("queue_delayed_work: bitmap_flush_work\n");
2663			queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
2664		}
2665		goto unlock_ret;
2666	}
2667
2668	get_area_and_offset(ic, range.logical_sector, &area, &offset);
2669	range.n_sectors = min((sector_t)RECALC_SECTORS, ic->provided_data_sectors - range.logical_sector);
2670	if (!ic->meta_dev)
2671		range.n_sectors = min(range.n_sectors, ((sector_t)1U << ic->sb->log2_interleave_sectors) - (unsigned)offset);
2672
2673	add_new_range_and_wait(ic, &range);
2674	spin_unlock_irq(&ic->endio_wait.lock);
2675	logical_sector = range.logical_sector;
2676	n_sectors = range.n_sectors;
2677
2678	if (ic->mode == 'B') {
2679		if (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector, n_sectors, BITMAP_OP_TEST_ALL_CLEAR)) {
2680			goto advance_and_next;
2681		}
2682		while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector,
2683				       ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
2684			logical_sector += ic->sectors_per_block;
2685			n_sectors -= ic->sectors_per_block;
2686			cond_resched();
2687		}
2688		while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector + n_sectors - ic->sectors_per_block,
2689				       ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) {
2690			n_sectors -= ic->sectors_per_block;
2691			cond_resched();
2692		}
2693		get_area_and_offset(ic, logical_sector, &area, &offset);
2694	}
2695
2696	DEBUG_print("recalculating: %llx, %llx\n", logical_sector, n_sectors);
2697
2698	if (unlikely(++super_counter == RECALC_WRITE_SUPER)) {
2699		recalc_write_super(ic);
2700		if (ic->mode == 'B') {
2701			queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2702		}
2703		super_counter = 0;
2704	}
2705
2706	if (unlikely(dm_integrity_failed(ic)))
2707		goto err;
2708
2709	io_req.bi_opf = REQ_OP_READ;
 
2710	io_req.mem.type = DM_IO_VMA;
2711	io_req.mem.ptr.addr = ic->recalc_buffer;
2712	io_req.notify.fn = NULL;
2713	io_req.client = ic->io;
2714	io_loc.bdev = ic->dev->bdev;
2715	io_loc.sector = get_data_sector(ic, area, offset);
2716	io_loc.count = n_sectors;
2717
2718	r = dm_io(&io_req, 1, &io_loc, NULL);
2719	if (unlikely(r)) {
2720		dm_integrity_io_error(ic, "reading data", r);
2721		goto err;
2722	}
2723
2724	t = ic->recalc_tags;
2725	for (i = 0; i < n_sectors; i += ic->sectors_per_block) {
2726		integrity_sector_checksum(ic, logical_sector + i, ic->recalc_buffer + (i << SECTOR_SHIFT), t);
2727		t += ic->tag_size;
2728	}
2729
2730	metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset);
2731
2732	r = dm_integrity_rw_tag(ic, ic->recalc_tags, &metadata_block, &metadata_offset, t - ic->recalc_tags, TAG_WRITE);
2733	if (unlikely(r)) {
2734		dm_integrity_io_error(ic, "writing tags", r);
2735		goto err;
2736	}
2737
2738	if (ic->mode == 'B') {
2739		sector_t start, end;
2740		start = (range.logical_sector >>
2741			 (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)) <<
2742			(ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2743		end = ((range.logical_sector + range.n_sectors) >>
2744		       (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)) <<
2745			(ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2746		block_bitmap_op(ic, ic->recalc_bitmap, start, end - start, BITMAP_OP_CLEAR);
2747	}
2748
2749advance_and_next:
2750	cond_resched();
2751
2752	spin_lock_irq(&ic->endio_wait.lock);
2753	remove_range_unlocked(ic, &range);
2754	ic->sb->recalc_sector = cpu_to_le64(range.logical_sector + range.n_sectors);
2755	goto next_chunk;
2756
2757err:
2758	remove_range(ic, &range);
2759	return;
2760
2761unlock_ret:
2762	spin_unlock_irq(&ic->endio_wait.lock);
2763
2764	recalc_write_super(ic);
2765}
2766
2767static void bitmap_block_work(struct work_struct *w)
2768{
2769	struct bitmap_block_status *bbs = container_of(w, struct bitmap_block_status, work);
2770	struct dm_integrity_c *ic = bbs->ic;
2771	struct bio *bio;
2772	struct bio_list bio_queue;
2773	struct bio_list waiting;
2774
2775	bio_list_init(&waiting);
2776
2777	spin_lock(&bbs->bio_queue_lock);
2778	bio_queue = bbs->bio_queue;
2779	bio_list_init(&bbs->bio_queue);
2780	spin_unlock(&bbs->bio_queue_lock);
2781
2782	while ((bio = bio_list_pop(&bio_queue))) {
2783		struct dm_integrity_io *dio;
2784
2785		dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2786
2787		if (block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2788				    dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) {
2789			remove_range(ic, &dio->range);
2790			INIT_WORK(&dio->work, integrity_bio_wait);
2791			queue_work(ic->offload_wq, &dio->work);
2792		} else {
2793			block_bitmap_op(ic, ic->journal, dio->range.logical_sector,
2794					dio->range.n_sectors, BITMAP_OP_SET);
2795			bio_list_add(&waiting, bio);
2796		}
2797	}
2798
2799	if (bio_list_empty(&waiting))
2800		return;
2801
2802	rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC,
2803			   bbs->idx * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT),
2804			   BITMAP_BLOCK_SIZE >> SECTOR_SHIFT, NULL);
2805
2806	while ((bio = bio_list_pop(&waiting))) {
2807		struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io));
2808
2809		block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector,
2810				dio->range.n_sectors, BITMAP_OP_SET);
2811
2812		remove_range(ic, &dio->range);
2813		INIT_WORK(&dio->work, integrity_bio_wait);
2814		queue_work(ic->offload_wq, &dio->work);
2815	}
2816
2817	queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval);
2818}
2819
2820static void bitmap_flush_work(struct work_struct *work)
2821{
2822	struct dm_integrity_c *ic = container_of(work, struct dm_integrity_c, bitmap_flush_work.work);
2823	struct dm_integrity_range range;
2824	unsigned long limit;
2825	struct bio *bio;
2826
2827	dm_integrity_flush_buffers(ic, false);
2828
2829	range.logical_sector = 0;
2830	range.n_sectors = ic->provided_data_sectors;
2831
2832	spin_lock_irq(&ic->endio_wait.lock);
2833	add_new_range_and_wait(ic, &range);
2834	spin_unlock_irq(&ic->endio_wait.lock);
2835
2836	dm_integrity_flush_buffers(ic, true);
 
 
2837
2838	limit = ic->provided_data_sectors;
2839	if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
2840		limit = le64_to_cpu(ic->sb->recalc_sector)
2841			>> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)
2842			<< (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit);
2843	}
2844	/*DEBUG_print("zeroing journal\n");*/
2845	block_bitmap_op(ic, ic->journal, 0, limit, BITMAP_OP_CLEAR);
2846	block_bitmap_op(ic, ic->may_write_bitmap, 0, limit, BITMAP_OP_CLEAR);
2847
2848	rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0,
2849			   ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
2850
2851	spin_lock_irq(&ic->endio_wait.lock);
2852	remove_range_unlocked(ic, &range);
2853	while (unlikely((bio = bio_list_pop(&ic->synchronous_bios)) != NULL)) {
2854		bio_endio(bio);
2855		spin_unlock_irq(&ic->endio_wait.lock);
2856		spin_lock_irq(&ic->endio_wait.lock);
2857	}
2858	spin_unlock_irq(&ic->endio_wait.lock);
2859}
2860
2861
2862static void init_journal(struct dm_integrity_c *ic, unsigned start_section,
2863			 unsigned n_sections, unsigned char commit_seq)
2864{
2865	unsigned i, j, n;
2866
2867	if (!n_sections)
2868		return;
2869
2870	for (n = 0; n < n_sections; n++) {
2871		i = start_section + n;
2872		wraparound_section(ic, &i);
2873		for (j = 0; j < ic->journal_section_sectors; j++) {
2874			struct journal_sector *js = access_journal(ic, i, j);
2875			BUILD_BUG_ON(sizeof(js->sectors) != JOURNAL_SECTOR_DATA);
2876			memset(&js->sectors, 0, sizeof(js->sectors));
2877			js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq);
2878		}
2879		for (j = 0; j < ic->journal_section_entries; j++) {
2880			struct journal_entry *je = access_journal_entry(ic, i, j);
2881			journal_entry_set_unused(je);
2882		}
2883	}
2884
2885	write_journal(ic, start_section, n_sections);
2886}
2887
2888static int find_commit_seq(struct dm_integrity_c *ic, unsigned i, unsigned j, commit_id_t id)
2889{
2890	unsigned char k;
2891	for (k = 0; k < N_COMMIT_IDS; k++) {
2892		if (dm_integrity_commit_id(ic, i, j, k) == id)
2893			return k;
2894	}
2895	dm_integrity_io_error(ic, "journal commit id", -EIO);
2896	return -EIO;
2897}
2898
2899static void replay_journal(struct dm_integrity_c *ic)
2900{
2901	unsigned i, j;
2902	bool used_commit_ids[N_COMMIT_IDS];
2903	unsigned max_commit_id_sections[N_COMMIT_IDS];
2904	unsigned write_start, write_sections;
2905	unsigned continue_section;
2906	bool journal_empty;
2907	unsigned char unused, last_used, want_commit_seq;
2908
2909	if (ic->mode == 'R')
2910		return;
2911
2912	if (ic->journal_uptodate)
2913		return;
2914
2915	last_used = 0;
2916	write_start = 0;
2917
2918	if (!ic->just_formatted) {
2919		DEBUG_print("reading journal\n");
2920		rw_journal(ic, REQ_OP_READ, 0, ic->journal_sections, NULL);
2921		if (ic->journal_io)
2922			DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal");
2923		if (ic->journal_io) {
2924			struct journal_completion crypt_comp;
2925			crypt_comp.ic = ic;
2926			init_completion(&crypt_comp.comp);
2927			crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0);
2928			encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp);
2929			wait_for_completion(&crypt_comp.comp);
2930		}
2931		DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal");
2932	}
2933
2934	if (dm_integrity_failed(ic))
2935		goto clear_journal;
2936
2937	journal_empty = true;
2938	memset(used_commit_ids, 0, sizeof used_commit_ids);
2939	memset(max_commit_id_sections, 0, sizeof max_commit_id_sections);
2940	for (i = 0; i < ic->journal_sections; i++) {
2941		for (j = 0; j < ic->journal_section_sectors; j++) {
2942			int k;
2943			struct journal_sector *js = access_journal(ic, i, j);
2944			k = find_commit_seq(ic, i, j, js->commit_id);
2945			if (k < 0)
2946				goto clear_journal;
2947			used_commit_ids[k] = true;
2948			max_commit_id_sections[k] = i;
2949		}
2950		if (journal_empty) {
2951			for (j = 0; j < ic->journal_section_entries; j++) {
2952				struct journal_entry *je = access_journal_entry(ic, i, j);
2953				if (!journal_entry_is_unused(je)) {
2954					journal_empty = false;
2955					break;
2956				}
2957			}
2958		}
2959	}
2960
2961	if (!used_commit_ids[N_COMMIT_IDS - 1]) {
2962		unused = N_COMMIT_IDS - 1;
2963		while (unused && !used_commit_ids[unused - 1])
2964			unused--;
2965	} else {
2966		for (unused = 0; unused < N_COMMIT_IDS; unused++)
2967			if (!used_commit_ids[unused])
2968				break;
2969		if (unused == N_COMMIT_IDS) {
2970			dm_integrity_io_error(ic, "journal commit ids", -EIO);
2971			goto clear_journal;
2972		}
2973	}
2974	DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n",
2975		    unused, used_commit_ids[0], used_commit_ids[1],
2976		    used_commit_ids[2], used_commit_ids[3]);
2977
2978	last_used = prev_commit_seq(unused);
2979	want_commit_seq = prev_commit_seq(last_used);
2980
2981	if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)])
2982		journal_empty = true;
2983
2984	write_start = max_commit_id_sections[last_used] + 1;
2985	if (unlikely(write_start >= ic->journal_sections))
2986		want_commit_seq = next_commit_seq(want_commit_seq);
2987	wraparound_section(ic, &write_start);
2988
2989	i = write_start;
2990	for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) {
2991		for (j = 0; j < ic->journal_section_sectors; j++) {
2992			struct journal_sector *js = access_journal(ic, i, j);
2993
2994			if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) {
2995				/*
2996				 * This could be caused by crash during writing.
2997				 * We won't replay the inconsistent part of the
2998				 * journal.
2999				 */
3000				DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n",
3001					    i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq);
3002				goto brk;
3003			}
3004		}
3005		i++;
3006		if (unlikely(i >= ic->journal_sections))
3007			want_commit_seq = next_commit_seq(want_commit_seq);
3008		wraparound_section(ic, &i);
3009	}
3010brk:
3011
3012	if (!journal_empty) {
3013		DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n",
3014			    write_sections, write_start, want_commit_seq);
3015		do_journal_write(ic, write_start, write_sections, true);
3016	}
3017
3018	if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) {
3019		continue_section = write_start;
3020		ic->commit_seq = want_commit_seq;
3021		DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq);
3022	} else {
3023		unsigned s;
3024		unsigned char erase_seq;
3025clear_journal:
3026		DEBUG_print("clearing journal\n");
3027
3028		erase_seq = prev_commit_seq(prev_commit_seq(last_used));
3029		s = write_start;
3030		init_journal(ic, s, 1, erase_seq);
3031		s++;
3032		wraparound_section(ic, &s);
3033		if (ic->journal_sections >= 2) {
3034			init_journal(ic, s, ic->journal_sections - 2, erase_seq);
3035			s += ic->journal_sections - 2;
3036			wraparound_section(ic, &s);
3037			init_journal(ic, s, 1, erase_seq);
3038		}
3039
3040		continue_section = 0;
3041		ic->commit_seq = next_commit_seq(erase_seq);
3042	}
3043
3044	ic->committed_section = continue_section;
3045	ic->n_committed_sections = 0;
3046
3047	ic->uncommitted_section = continue_section;
3048	ic->n_uncommitted_sections = 0;
3049
3050	ic->free_section = continue_section;
3051	ic->free_section_entry = 0;
3052	ic->free_sectors = ic->journal_entries;
3053
3054	ic->journal_tree_root = RB_ROOT;
3055	for (i = 0; i < ic->journal_entries; i++)
3056		init_journal_node(&ic->journal_tree[i]);
3057}
3058
3059static void dm_integrity_enter_synchronous_mode(struct dm_integrity_c *ic)
3060{
3061	DEBUG_print("dm_integrity_enter_synchronous_mode\n");
3062
3063	if (ic->mode == 'B') {
3064		ic->bitmap_flush_interval = msecs_to_jiffies(10) + 1;
3065		ic->synchronous_mode = 1;
3066
3067		cancel_delayed_work_sync(&ic->bitmap_flush_work);
3068		queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0);
3069		flush_workqueue(ic->commit_wq);
3070	}
3071}
3072
3073static int dm_integrity_reboot(struct notifier_block *n, unsigned long code, void *x)
3074{
3075	struct dm_integrity_c *ic = container_of(n, struct dm_integrity_c, reboot_notifier);
3076
3077	DEBUG_print("dm_integrity_reboot\n");
3078
3079	dm_integrity_enter_synchronous_mode(ic);
3080
3081	return NOTIFY_DONE;
3082}
3083
3084static void dm_integrity_postsuspend(struct dm_target *ti)
3085{
3086	struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
3087	int r;
3088
3089	WARN_ON(unregister_reboot_notifier(&ic->reboot_notifier));
3090
3091	del_timer_sync(&ic->autocommit_timer);
3092
3093	if (ic->recalc_wq)
3094		drain_workqueue(ic->recalc_wq);
3095
3096	if (ic->mode == 'B')
3097		cancel_delayed_work_sync(&ic->bitmap_flush_work);
3098
3099	queue_work(ic->commit_wq, &ic->commit_work);
3100	drain_workqueue(ic->commit_wq);
3101
3102	if (ic->mode == 'J') {
3103		queue_work(ic->writer_wq, &ic->writer_work);
 
3104		drain_workqueue(ic->writer_wq);
3105		dm_integrity_flush_buffers(ic, true);
3106		if (ic->wrote_to_journal) {
3107			init_journal(ic, ic->free_section,
3108				     ic->journal_sections - ic->free_section, ic->commit_seq);
3109			if (ic->free_section) {
3110				init_journal(ic, 0, ic->free_section,
3111					     next_commit_seq(ic->commit_seq));
3112			}
3113		}
3114	}
3115
3116	if (ic->mode == 'B') {
3117		dm_integrity_flush_buffers(ic, true);
3118#if 1
3119		/* set to 0 to test bitmap replay code */
3120		init_journal(ic, 0, ic->journal_sections, 0);
3121		ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3122		r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA);
3123		if (unlikely(r))
3124			dm_integrity_io_error(ic, "writing superblock", r);
3125#endif
3126	}
3127
3128	BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
3129
3130	ic->journal_uptodate = true;
3131}
3132
3133static void dm_integrity_resume(struct dm_target *ti)
3134{
3135	struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
3136	__u64 old_provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
3137	int r;
3138
3139	DEBUG_print("resume\n");
3140
3141	ic->wrote_to_journal = false;
3142
3143	if (ic->provided_data_sectors != old_provided_data_sectors) {
3144		if (ic->provided_data_sectors > old_provided_data_sectors &&
3145		    ic->mode == 'B' &&
3146		    ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) {
3147			rw_journal_sectors(ic, REQ_OP_READ, 0,
3148					   ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3149			block_bitmap_op(ic, ic->journal, old_provided_data_sectors,
3150					ic->provided_data_sectors - old_provided_data_sectors, BITMAP_OP_SET);
3151			rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0,
3152					   ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3153		}
3154
3155		ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
3156		r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA);
3157		if (unlikely(r))
3158			dm_integrity_io_error(ic, "writing superblock", r);
3159	}
3160
3161	if (ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP)) {
3162		DEBUG_print("resume dirty_bitmap\n");
3163		rw_journal_sectors(ic, REQ_OP_READ, 0,
3164				   ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3165		if (ic->mode == 'B') {
3166			if (ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
3167			    !ic->reset_recalculate_flag) {
3168				block_bitmap_copy(ic, ic->recalc_bitmap, ic->journal);
3169				block_bitmap_copy(ic, ic->may_write_bitmap, ic->journal);
3170				if (!block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors,
3171						     BITMAP_OP_TEST_ALL_CLEAR)) {
3172					ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3173					ic->sb->recalc_sector = cpu_to_le64(0);
3174				}
3175			} else {
3176				DEBUG_print("non-matching blocks_per_bitmap_bit: %u, %u\n",
3177					    ic->sb->log2_blocks_per_bitmap_bit, ic->log2_blocks_per_bitmap_bit);
3178				ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
3179				block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3180				block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3181				block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_SET);
3182				rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0,
3183						   ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3184				ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3185				ic->sb->recalc_sector = cpu_to_le64(0);
3186			}
3187		} else {
3188			if (!(ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
3189			      block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR)) ||
3190			    ic->reset_recalculate_flag) {
3191				ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3192				ic->sb->recalc_sector = cpu_to_le64(0);
3193			}
3194			init_journal(ic, 0, ic->journal_sections, 0);
3195			replay_journal(ic);
3196			ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3197		}
3198		r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA);
3199		if (unlikely(r))
3200			dm_integrity_io_error(ic, "writing superblock", r);
3201	} else {
3202		replay_journal(ic);
3203		if (ic->reset_recalculate_flag) {
3204			ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
3205			ic->sb->recalc_sector = cpu_to_le64(0);
3206		}
3207		if (ic->mode == 'B') {
3208			ic->sb->flags |= cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
3209			ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
3210			r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA);
3211			if (unlikely(r))
3212				dm_integrity_io_error(ic, "writing superblock", r);
3213
3214			block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3215			block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3216			block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR);
3217			if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
3218			    le64_to_cpu(ic->sb->recalc_sector) < ic->provided_data_sectors) {
3219				block_bitmap_op(ic, ic->journal, le64_to_cpu(ic->sb->recalc_sector),
3220						ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3221				block_bitmap_op(ic, ic->recalc_bitmap, le64_to_cpu(ic->sb->recalc_sector),
3222						ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3223				block_bitmap_op(ic, ic->may_write_bitmap, le64_to_cpu(ic->sb->recalc_sector),
3224						ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET);
3225			}
3226			rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0,
3227					   ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
3228		}
3229	}
3230
3231	DEBUG_print("testing recalc: %x\n", ic->sb->flags);
3232	if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
3233		__u64 recalc_pos = le64_to_cpu(ic->sb->recalc_sector);
3234		DEBUG_print("recalc pos: %llx / %llx\n", recalc_pos, ic->provided_data_sectors);
3235		if (recalc_pos < ic->provided_data_sectors) {
3236			queue_work(ic->recalc_wq, &ic->recalc_work);
3237		} else if (recalc_pos > ic->provided_data_sectors) {
3238			ic->sb->recalc_sector = cpu_to_le64(ic->provided_data_sectors);
3239			recalc_write_super(ic);
3240		}
3241	}
3242
3243	ic->reboot_notifier.notifier_call = dm_integrity_reboot;
3244	ic->reboot_notifier.next = NULL;
3245	ic->reboot_notifier.priority = INT_MAX - 1;	/* be notified after md and before hardware drivers */
3246	WARN_ON(register_reboot_notifier(&ic->reboot_notifier));
3247
3248#if 0
3249	/* set to 1 to stress test synchronous mode */
3250	dm_integrity_enter_synchronous_mode(ic);
3251#endif
3252}
3253
3254static void dm_integrity_status(struct dm_target *ti, status_type_t type,
3255				unsigned status_flags, char *result, unsigned maxlen)
3256{
3257	struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
3258	unsigned arg_count;
3259	size_t sz = 0;
3260
3261	switch (type) {
3262	case STATUSTYPE_INFO:
3263		DMEMIT("%llu %llu",
3264			(unsigned long long)atomic64_read(&ic->number_of_mismatches),
3265			ic->provided_data_sectors);
3266		if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
3267			DMEMIT(" %llu", le64_to_cpu(ic->sb->recalc_sector));
3268		else
3269			DMEMIT(" -");
3270		break;
3271
3272	case STATUSTYPE_TABLE: {
3273		__u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100;
3274		watermark_percentage += ic->journal_entries / 2;
3275		do_div(watermark_percentage, ic->journal_entries);
3276		arg_count = 3;
3277		arg_count += !!ic->meta_dev;
3278		arg_count += ic->sectors_per_block != 1;
3279		arg_count += !!(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING));
3280		arg_count += ic->reset_recalculate_flag;
3281		arg_count += ic->discard;
3282		arg_count += ic->mode == 'J';
3283		arg_count += ic->mode == 'J';
3284		arg_count += ic->mode == 'B';
3285		arg_count += ic->mode == 'B';
3286		arg_count += !!ic->internal_hash_alg.alg_string;
3287		arg_count += !!ic->journal_crypt_alg.alg_string;
3288		arg_count += !!ic->journal_mac_alg.alg_string;
3289		arg_count += (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0;
3290		arg_count += (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0;
3291		arg_count += ic->legacy_recalculate;
3292		DMEMIT("%s %llu %u %c %u", ic->dev->name, ic->start,
3293		       ic->tag_size, ic->mode, arg_count);
3294		if (ic->meta_dev)
3295			DMEMIT(" meta_device:%s", ic->meta_dev->name);
3296		if (ic->sectors_per_block != 1)
3297			DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
3298		if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
3299			DMEMIT(" recalculate");
3300		if (ic->reset_recalculate_flag)
3301			DMEMIT(" reset_recalculate");
3302		if (ic->discard)
3303			DMEMIT(" allow_discards");
3304		DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
3305		DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors);
3306		DMEMIT(" buffer_sectors:%u", 1U << ic->log2_buffer_sectors);
3307		if (ic->mode == 'J') {
3308			DMEMIT(" journal_watermark:%u", (unsigned)watermark_percentage);
3309			DMEMIT(" commit_time:%u", ic->autocommit_msec);
3310		}
3311		if (ic->mode == 'B') {
3312			DMEMIT(" sectors_per_bit:%llu", (sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit);
3313			DMEMIT(" bitmap_flush_interval:%u", jiffies_to_msecs(ic->bitmap_flush_interval));
3314		}
3315		if ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0)
3316			DMEMIT(" fix_padding");
3317		if ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0)
3318			DMEMIT(" fix_hmac");
3319		if (ic->legacy_recalculate)
3320			DMEMIT(" legacy_recalculate");
3321
3322#define EMIT_ALG(a, n)							\
3323		do {							\
3324			if (ic->a.alg_string) {				\
3325				DMEMIT(" %s:%s", n, ic->a.alg_string);	\
3326				if (ic->a.key_string)			\
3327					DMEMIT(":%s", ic->a.key_string);\
3328			}						\
3329		} while (0)
3330		EMIT_ALG(internal_hash_alg, "internal_hash");
3331		EMIT_ALG(journal_crypt_alg, "journal_crypt");
3332		EMIT_ALG(journal_mac_alg, "journal_mac");
3333		break;
3334	}
3335	case STATUSTYPE_IMA:
3336		DMEMIT_TARGET_NAME_VERSION(ti->type);
3337		DMEMIT(",dev_name=%s,start=%llu,tag_size=%u,mode=%c",
3338			ic->dev->name, ic->start, ic->tag_size, ic->mode);
3339
3340		if (ic->meta_dev)
3341			DMEMIT(",meta_device=%s", ic->meta_dev->name);
3342		if (ic->sectors_per_block != 1)
3343			DMEMIT(",block_size=%u", ic->sectors_per_block << SECTOR_SHIFT);
3344
3345		DMEMIT(",recalculate=%c", (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) ?
3346		       'y' : 'n');
3347		DMEMIT(",allow_discards=%c", ic->discard ? 'y' : 'n');
3348		DMEMIT(",fix_padding=%c",
3349		       ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0) ? 'y' : 'n');
3350		DMEMIT(",fix_hmac=%c",
3351		       ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0) ? 'y' : 'n');
3352		DMEMIT(",legacy_recalculate=%c", ic->legacy_recalculate ? 'y' : 'n');
3353
3354		DMEMIT(",journal_sectors=%u", ic->initial_sectors - SB_SECTORS);
3355		DMEMIT(",interleave_sectors=%u", 1U << ic->sb->log2_interleave_sectors);
3356		DMEMIT(",buffer_sectors=%u", 1U << ic->log2_buffer_sectors);
3357		DMEMIT(";");
3358		break;
3359	}
3360}
3361
3362static int dm_integrity_iterate_devices(struct dm_target *ti,
3363					iterate_devices_callout_fn fn, void *data)
3364{
3365	struct dm_integrity_c *ic = ti->private;
3366
3367	if (!ic->meta_dev)
3368		return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data);
3369	else
3370		return fn(ti, ic->dev, 0, ti->len, data);
3371}
3372
3373static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits)
3374{
3375	struct dm_integrity_c *ic = ti->private;
3376
3377	if (ic->sectors_per_block > 1) {
3378		limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
3379		limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT;
3380		blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT);
3381		limits->dma_alignment = limits->logical_block_size - 1;
3382	}
3383}
3384
3385static void calculate_journal_section_size(struct dm_integrity_c *ic)
3386{
3387	unsigned sector_space = JOURNAL_SECTOR_DATA;
3388
3389	ic->journal_sections = le32_to_cpu(ic->sb->journal_sections);
3390	ic->journal_entry_size = roundup(offsetof(struct journal_entry, last_bytes[ic->sectors_per_block]) + ic->tag_size,
3391					 JOURNAL_ENTRY_ROUNDUP);
3392
3393	if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC))
3394		sector_space -= JOURNAL_MAC_PER_SECTOR;
3395	ic->journal_entries_per_sector = sector_space / ic->journal_entry_size;
3396	ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS;
3397	ic->journal_section_sectors = (ic->journal_section_entries << ic->sb->log2_sectors_per_block) + JOURNAL_BLOCK_SECTORS;
3398	ic->journal_entries = ic->journal_section_entries * ic->journal_sections;
3399}
3400
3401static int calculate_device_limits(struct dm_integrity_c *ic)
3402{
3403	__u64 initial_sectors;
3404
3405	calculate_journal_section_size(ic);
3406	initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections;
3407	if (initial_sectors + METADATA_PADDING_SECTORS >= ic->meta_device_sectors || initial_sectors > UINT_MAX)
3408		return -EINVAL;
3409	ic->initial_sectors = initial_sectors;
3410
3411	if (!ic->meta_dev) {
3412		sector_t last_sector, last_area, last_offset;
3413
3414		/* we have to maintain excessive padding for compatibility with existing volumes */
3415		__u64 metadata_run_padding =
3416			ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING) ?
3417			(__u64)(METADATA_PADDING_SECTORS << SECTOR_SHIFT) :
3418			(__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS);
3419
3420		ic->metadata_run = round_up((__u64)ic->tag_size << (ic->sb->log2_interleave_sectors - ic->sb->log2_sectors_per_block),
3421					    metadata_run_padding) >> SECTOR_SHIFT;
3422		if (!(ic->metadata_run & (ic->metadata_run - 1)))
3423			ic->log2_metadata_run = __ffs(ic->metadata_run);
3424		else
3425			ic->log2_metadata_run = -1;
3426
3427		get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset);
3428		last_sector = get_data_sector(ic, last_area, last_offset);
3429		if (last_sector < ic->start || last_sector >= ic->meta_device_sectors)
3430			return -EINVAL;
3431	} else {
3432		__u64 meta_size = (ic->provided_data_sectors >> ic->sb->log2_sectors_per_block) * ic->tag_size;
3433		meta_size = (meta_size + ((1U << (ic->log2_buffer_sectors + SECTOR_SHIFT)) - 1))
3434				>> (ic->log2_buffer_sectors + SECTOR_SHIFT);
3435		meta_size <<= ic->log2_buffer_sectors;
3436		if (ic->initial_sectors + meta_size < ic->initial_sectors ||
3437		    ic->initial_sectors + meta_size > ic->meta_device_sectors)
3438			return -EINVAL;
3439		ic->metadata_run = 1;
3440		ic->log2_metadata_run = 0;
3441	}
3442
3443	return 0;
3444}
3445
3446static void get_provided_data_sectors(struct dm_integrity_c *ic)
3447{
3448	if (!ic->meta_dev) {
3449		int test_bit;
3450		ic->provided_data_sectors = 0;
3451		for (test_bit = fls64(ic->meta_device_sectors) - 1; test_bit >= 3; test_bit--) {
3452			__u64 prev_data_sectors = ic->provided_data_sectors;
3453
3454			ic->provided_data_sectors |= (sector_t)1 << test_bit;
3455			if (calculate_device_limits(ic))
3456				ic->provided_data_sectors = prev_data_sectors;
3457		}
3458	} else {
3459		ic->provided_data_sectors = ic->data_device_sectors;
3460		ic->provided_data_sectors &= ~(sector_t)(ic->sectors_per_block - 1);
3461	}
3462}
3463
3464static int initialize_superblock(struct dm_integrity_c *ic, unsigned journal_sectors, unsigned interleave_sectors)
3465{
3466	unsigned journal_sections;
3467	int test_bit;
3468
3469	memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT);
3470	memcpy(ic->sb->magic, SB_MAGIC, 8);
3471	ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size);
3472	ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block);
3473	if (ic->journal_mac_alg.alg_string)
3474		ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC);
3475
3476	calculate_journal_section_size(ic);
3477	journal_sections = journal_sectors / ic->journal_section_sectors;
3478	if (!journal_sections)
3479		journal_sections = 1;
3480
3481	if (ic->fix_hmac && (ic->internal_hash_alg.alg_string || ic->journal_mac_alg.alg_string)) {
3482		ic->sb->flags |= cpu_to_le32(SB_FLAG_FIXED_HMAC);
3483		get_random_bytes(ic->sb->salt, SALT_SIZE);
3484	}
3485
3486	if (!ic->meta_dev) {
3487		if (ic->fix_padding)
3488			ic->sb->flags |= cpu_to_le32(SB_FLAG_FIXED_PADDING);
3489		ic->sb->journal_sections = cpu_to_le32(journal_sections);
3490		if (!interleave_sectors)
3491			interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
3492		ic->sb->log2_interleave_sectors = __fls(interleave_sectors);
3493		ic->sb->log2_interleave_sectors = max((__u8)MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3494		ic->sb->log2_interleave_sectors = min((__u8)MAX_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors);
3495
3496		get_provided_data_sectors(ic);
3497		if (!ic->provided_data_sectors)
3498			return -EINVAL;
3499	} else {
3500		ic->sb->log2_interleave_sectors = 0;
3501
3502		get_provided_data_sectors(ic);
3503		if (!ic->provided_data_sectors)
3504			return -EINVAL;
3505
3506try_smaller_buffer:
3507		ic->sb->journal_sections = cpu_to_le32(0);
3508		for (test_bit = fls(journal_sections) - 1; test_bit >= 0; test_bit--) {
3509			__u32 prev_journal_sections = le32_to_cpu(ic->sb->journal_sections);
3510			__u32 test_journal_sections = prev_journal_sections | (1U << test_bit);
3511			if (test_journal_sections > journal_sections)
3512				continue;
3513			ic->sb->journal_sections = cpu_to_le32(test_journal_sections);
3514			if (calculate_device_limits(ic))
3515				ic->sb->journal_sections = cpu_to_le32(prev_journal_sections);
3516
3517		}
3518		if (!le32_to_cpu(ic->sb->journal_sections)) {
3519			if (ic->log2_buffer_sectors > 3) {
3520				ic->log2_buffer_sectors--;
3521				goto try_smaller_buffer;
3522			}
3523			return -EINVAL;
3524		}
3525	}
3526
3527	ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
3528
3529	sb_set_version(ic);
3530
3531	return 0;
3532}
3533
3534static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic)
3535{
3536	struct gendisk *disk = dm_disk(dm_table_get_md(ti->table));
3537	struct blk_integrity bi;
3538
3539	memset(&bi, 0, sizeof(bi));
3540	bi.profile = &dm_integrity_profile;
3541	bi.tuple_size = ic->tag_size;
3542	bi.tag_size = bi.tuple_size;
3543	bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT;
3544
3545	blk_integrity_register(disk, &bi);
3546	blk_queue_max_integrity_segments(disk->queue, UINT_MAX);
3547}
3548
3549static void dm_integrity_free_page_list(struct page_list *pl)
3550{
3551	unsigned i;
3552
3553	if (!pl)
3554		return;
3555	for (i = 0; pl[i].page; i++)
3556		__free_page(pl[i].page);
3557	kvfree(pl);
3558}
3559
3560static struct page_list *dm_integrity_alloc_page_list(unsigned n_pages)
3561{
3562	struct page_list *pl;
3563	unsigned i;
3564
3565	pl = kvmalloc_array(n_pages + 1, sizeof(struct page_list), GFP_KERNEL | __GFP_ZERO);
3566	if (!pl)
3567		return NULL;
3568
3569	for (i = 0; i < n_pages; i++) {
3570		pl[i].page = alloc_page(GFP_KERNEL);
3571		if (!pl[i].page) {
3572			dm_integrity_free_page_list(pl);
3573			return NULL;
3574		}
3575		if (i)
3576			pl[i - 1].next = &pl[i];
3577	}
3578	pl[i].page = NULL;
3579	pl[i].next = NULL;
3580
3581	return pl;
3582}
3583
3584static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl)
3585{
3586	unsigned i;
3587	for (i = 0; i < ic->journal_sections; i++)
3588		kvfree(sl[i]);
3589	kvfree(sl);
3590}
3591
3592static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic,
3593								   struct page_list *pl)
3594{
3595	struct scatterlist **sl;
3596	unsigned i;
3597
3598	sl = kvmalloc_array(ic->journal_sections,
3599			    sizeof(struct scatterlist *),
3600			    GFP_KERNEL | __GFP_ZERO);
3601	if (!sl)
3602		return NULL;
3603
3604	for (i = 0; i < ic->journal_sections; i++) {
3605		struct scatterlist *s;
3606		unsigned start_index, start_offset;
3607		unsigned end_index, end_offset;
3608		unsigned n_pages;
3609		unsigned idx;
3610
3611		page_list_location(ic, i, 0, &start_index, &start_offset);
3612		page_list_location(ic, i, ic->journal_section_sectors - 1,
3613				   &end_index, &end_offset);
3614
3615		n_pages = (end_index - start_index + 1);
3616
3617		s = kvmalloc_array(n_pages, sizeof(struct scatterlist),
3618				   GFP_KERNEL);
3619		if (!s) {
3620			dm_integrity_free_journal_scatterlist(ic, sl);
3621			return NULL;
3622		}
3623
3624		sg_init_table(s, n_pages);
3625		for (idx = start_index; idx <= end_index; idx++) {
3626			char *va = lowmem_page_address(pl[idx].page);
3627			unsigned start = 0, end = PAGE_SIZE;
3628			if (idx == start_index)
3629				start = start_offset;
3630			if (idx == end_index)
3631				end = end_offset + (1 << SECTOR_SHIFT);
3632			sg_set_buf(&s[idx - start_index], va + start, end - start);
3633		}
3634
3635		sl[i] = s;
3636	}
3637
3638	return sl;
3639}
3640
3641static void free_alg(struct alg_spec *a)
3642{
3643	kfree_sensitive(a->alg_string);
3644	kfree_sensitive(a->key);
3645	memset(a, 0, sizeof *a);
3646}
3647
3648static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval)
3649{
3650	char *k;
3651
3652	free_alg(a);
3653
3654	a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL);
3655	if (!a->alg_string)
3656		goto nomem;
3657
3658	k = strchr(a->alg_string, ':');
3659	if (k) {
3660		*k = 0;
3661		a->key_string = k + 1;
3662		if (strlen(a->key_string) & 1)
3663			goto inval;
3664
3665		a->key_size = strlen(a->key_string) / 2;
3666		a->key = kmalloc(a->key_size, GFP_KERNEL);
3667		if (!a->key)
3668			goto nomem;
3669		if (hex2bin(a->key, a->key_string, a->key_size))
3670			goto inval;
3671	}
3672
3673	return 0;
3674inval:
3675	*error = error_inval;
3676	return -EINVAL;
3677nomem:
3678	*error = "Out of memory for an argument";
3679	return -ENOMEM;
3680}
3681
3682static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error,
3683		   char *error_alg, char *error_key)
3684{
3685	int r;
3686
3687	if (a->alg_string) {
3688		*hash = crypto_alloc_shash(a->alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
3689		if (IS_ERR(*hash)) {
3690			*error = error_alg;
3691			r = PTR_ERR(*hash);
3692			*hash = NULL;
3693			return r;
3694		}
3695
3696		if (a->key) {
3697			r = crypto_shash_setkey(*hash, a->key, a->key_size);
3698			if (r) {
3699				*error = error_key;
3700				return r;
3701			}
3702		} else if (crypto_shash_get_flags(*hash) & CRYPTO_TFM_NEED_KEY) {
3703			*error = error_key;
3704			return -ENOKEY;
3705		}
3706	}
3707
3708	return 0;
3709}
3710
3711static int create_journal(struct dm_integrity_c *ic, char **error)
3712{
3713	int r = 0;
3714	unsigned i;
3715	__u64 journal_pages, journal_desc_size, journal_tree_size;
3716	unsigned char *crypt_data = NULL, *crypt_iv = NULL;
3717	struct skcipher_request *req = NULL;
3718
3719	ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL);
3720	ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL);
3721	ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL);
3722	ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL);
3723
3724	journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors,
3725				PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT);
3726	journal_desc_size = journal_pages * sizeof(struct page_list);
3727	if (journal_pages >= totalram_pages() - totalhigh_pages() || journal_desc_size > ULONG_MAX) {
3728		*error = "Journal doesn't fit into memory";
3729		r = -ENOMEM;
3730		goto bad;
3731	}
3732	ic->journal_pages = journal_pages;
3733
3734	ic->journal = dm_integrity_alloc_page_list(ic->journal_pages);
3735	if (!ic->journal) {
3736		*error = "Could not allocate memory for journal";
3737		r = -ENOMEM;
3738		goto bad;
3739	}
3740	if (ic->journal_crypt_alg.alg_string) {
3741		unsigned ivsize, blocksize;
3742		struct journal_completion comp;
3743
3744		comp.ic = ic;
3745		ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
3746		if (IS_ERR(ic->journal_crypt)) {
3747			*error = "Invalid journal cipher";
3748			r = PTR_ERR(ic->journal_crypt);
3749			ic->journal_crypt = NULL;
3750			goto bad;
3751		}
3752		ivsize = crypto_skcipher_ivsize(ic->journal_crypt);
3753		blocksize = crypto_skcipher_blocksize(ic->journal_crypt);
3754
3755		if (ic->journal_crypt_alg.key) {
3756			r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key,
3757						   ic->journal_crypt_alg.key_size);
3758			if (r) {
3759				*error = "Error setting encryption key";
3760				goto bad;
3761			}
3762		}
3763		DEBUG_print("cipher %s, block size %u iv size %u\n",
3764			    ic->journal_crypt_alg.alg_string, blocksize, ivsize);
3765
3766		ic->journal_io = dm_integrity_alloc_page_list(ic->journal_pages);
3767		if (!ic->journal_io) {
3768			*error = "Could not allocate memory for journal io";
3769			r = -ENOMEM;
3770			goto bad;
3771		}
3772
3773		if (blocksize == 1) {
3774			struct scatterlist *sg;
3775
3776			req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3777			if (!req) {
3778				*error = "Could not allocate crypt request";
3779				r = -ENOMEM;
3780				goto bad;
3781			}
3782
3783			crypt_iv = kzalloc(ivsize, GFP_KERNEL);
3784			if (!crypt_iv) {
3785				*error = "Could not allocate iv";
3786				r = -ENOMEM;
3787				goto bad;
3788			}
3789
3790			ic->journal_xor = dm_integrity_alloc_page_list(ic->journal_pages);
3791			if (!ic->journal_xor) {
3792				*error = "Could not allocate memory for journal xor";
3793				r = -ENOMEM;
3794				goto bad;
3795			}
3796
3797			sg = kvmalloc_array(ic->journal_pages + 1,
3798					    sizeof(struct scatterlist),
3799					    GFP_KERNEL);
3800			if (!sg) {
3801				*error = "Unable to allocate sg list";
3802				r = -ENOMEM;
3803				goto bad;
3804			}
3805			sg_init_table(sg, ic->journal_pages + 1);
3806			for (i = 0; i < ic->journal_pages; i++) {
3807				char *va = lowmem_page_address(ic->journal_xor[i].page);
3808				clear_page(va);
3809				sg_set_buf(&sg[i], va, PAGE_SIZE);
3810			}
3811			sg_set_buf(&sg[i], &ic->commit_ids, sizeof ic->commit_ids);
3812
3813			skcipher_request_set_crypt(req, sg, sg,
3814						   PAGE_SIZE * ic->journal_pages + sizeof ic->commit_ids, crypt_iv);
3815			init_completion(&comp.comp);
3816			comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3817			if (do_crypt(true, req, &comp))
3818				wait_for_completion(&comp.comp);
3819			kvfree(sg);
3820			r = dm_integrity_failed(ic);
3821			if (r) {
3822				*error = "Unable to encrypt journal";
3823				goto bad;
3824			}
3825			DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data");
3826
3827			crypto_free_skcipher(ic->journal_crypt);
3828			ic->journal_crypt = NULL;
3829		} else {
3830			unsigned crypt_len = roundup(ivsize, blocksize);
3831
3832			req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3833			if (!req) {
3834				*error = "Could not allocate crypt request";
3835				r = -ENOMEM;
3836				goto bad;
3837			}
3838
3839			crypt_iv = kmalloc(ivsize, GFP_KERNEL);
3840			if (!crypt_iv) {
3841				*error = "Could not allocate iv";
3842				r = -ENOMEM;
3843				goto bad;
3844			}
3845
3846			crypt_data = kmalloc(crypt_len, GFP_KERNEL);
3847			if (!crypt_data) {
3848				*error = "Unable to allocate crypt data";
3849				r = -ENOMEM;
3850				goto bad;
3851			}
3852
3853			ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal);
3854			if (!ic->journal_scatterlist) {
3855				*error = "Unable to allocate sg list";
3856				r = -ENOMEM;
3857				goto bad;
3858			}
3859			ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io);
3860			if (!ic->journal_io_scatterlist) {
3861				*error = "Unable to allocate sg list";
3862				r = -ENOMEM;
3863				goto bad;
3864			}
3865			ic->sk_requests = kvmalloc_array(ic->journal_sections,
3866							 sizeof(struct skcipher_request *),
3867							 GFP_KERNEL | __GFP_ZERO);
3868			if (!ic->sk_requests) {
3869				*error = "Unable to allocate sk requests";
3870				r = -ENOMEM;
3871				goto bad;
3872			}
3873			for (i = 0; i < ic->journal_sections; i++) {
3874				struct scatterlist sg;
3875				struct skcipher_request *section_req;
3876				__le32 section_le = cpu_to_le32(i);
3877
3878				memset(crypt_iv, 0x00, ivsize);
3879				memset(crypt_data, 0x00, crypt_len);
3880				memcpy(crypt_data, &section_le, min((size_t)crypt_len, sizeof(section_le)));
3881
3882				sg_init_one(&sg, crypt_data, crypt_len);
3883				skcipher_request_set_crypt(req, &sg, &sg, crypt_len, crypt_iv);
3884				init_completion(&comp.comp);
3885				comp.in_flight = (atomic_t)ATOMIC_INIT(1);
3886				if (do_crypt(true, req, &comp))
3887					wait_for_completion(&comp.comp);
3888
3889				r = dm_integrity_failed(ic);
3890				if (r) {
3891					*error = "Unable to generate iv";
3892					goto bad;
3893				}
3894
3895				section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL);
3896				if (!section_req) {
3897					*error = "Unable to allocate crypt request";
3898					r = -ENOMEM;
3899					goto bad;
3900				}
3901				section_req->iv = kmalloc_array(ivsize, 2,
3902								GFP_KERNEL);
3903				if (!section_req->iv) {
3904					skcipher_request_free(section_req);
3905					*error = "Unable to allocate iv";
3906					r = -ENOMEM;
3907					goto bad;
3908				}
3909				memcpy(section_req->iv + ivsize, crypt_data, ivsize);
3910				section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT;
3911				ic->sk_requests[i] = section_req;
3912				DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i);
3913			}
3914		}
3915	}
3916
3917	for (i = 0; i < N_COMMIT_IDS; i++) {
3918		unsigned j;
3919retest_commit_id:
3920		for (j = 0; j < i; j++) {
3921			if (ic->commit_ids[j] == ic->commit_ids[i]) {
3922				ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1);
3923				goto retest_commit_id;
3924			}
3925		}
3926		DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]);
3927	}
3928
3929	journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node);
3930	if (journal_tree_size > ULONG_MAX) {
3931		*error = "Journal doesn't fit into memory";
3932		r = -ENOMEM;
3933		goto bad;
3934	}
3935	ic->journal_tree = kvmalloc(journal_tree_size, GFP_KERNEL);
3936	if (!ic->journal_tree) {
3937		*error = "Could not allocate memory for journal tree";
3938		r = -ENOMEM;
3939	}
3940bad:
3941	kfree(crypt_data);
3942	kfree(crypt_iv);
3943	skcipher_request_free(req);
3944
3945	return r;
3946}
3947
3948/*
3949 * Construct a integrity mapping
3950 *
3951 * Arguments:
3952 *	device
3953 *	offset from the start of the device
3954 *	tag size
3955 *	D - direct writes, J - journal writes, B - bitmap mode, R - recovery mode
3956 *	number of optional arguments
3957 *	optional arguments:
3958 *		journal_sectors
3959 *		interleave_sectors
3960 *		buffer_sectors
3961 *		journal_watermark
3962 *		commit_time
3963 *		meta_device
3964 *		block_size
3965 *		sectors_per_bit
3966 *		bitmap_flush_interval
3967 *		internal_hash
3968 *		journal_crypt
3969 *		journal_mac
3970 *		recalculate
3971 */
3972static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
3973{
3974	struct dm_integrity_c *ic;
3975	char dummy;
3976	int r;
3977	unsigned extra_args;
3978	struct dm_arg_set as;
3979	static const struct dm_arg _args[] = {
3980		{0, 18, "Invalid number of feature args"},
3981	};
3982	unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
3983	bool should_write_sb;
3984	__u64 threshold;
3985	unsigned long long start;
3986	__s8 log2_sectors_per_bitmap_bit = -1;
3987	__s8 log2_blocks_per_bitmap_bit;
3988	__u64 bits_in_journal;
3989	__u64 n_bitmap_bits;
3990
3991#define DIRECT_ARGUMENTS	4
3992
3993	if (argc <= DIRECT_ARGUMENTS) {
3994		ti->error = "Invalid argument count";
3995		return -EINVAL;
3996	}
3997
3998	ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL);
3999	if (!ic) {
4000		ti->error = "Cannot allocate integrity context";
4001		return -ENOMEM;
4002	}
4003	ti->private = ic;
4004	ti->per_io_data_size = sizeof(struct dm_integrity_io);
4005	ic->ti = ti;
4006
4007	ic->in_progress = RB_ROOT;
4008	INIT_LIST_HEAD(&ic->wait_list);
4009	init_waitqueue_head(&ic->endio_wait);
4010	bio_list_init(&ic->flush_bio_list);
4011	init_waitqueue_head(&ic->copy_to_journal_wait);
4012	init_completion(&ic->crypto_backoff);
4013	atomic64_set(&ic->number_of_mismatches, 0);
4014	ic->bitmap_flush_interval = BITMAP_FLUSH_INTERVAL;
4015
4016	r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev);
4017	if (r) {
4018		ti->error = "Device lookup failed";
4019		goto bad;
4020	}
4021
4022	if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) {
4023		ti->error = "Invalid starting offset";
4024		r = -EINVAL;
4025		goto bad;
4026	}
4027	ic->start = start;
4028
4029	if (strcmp(argv[2], "-")) {
4030		if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) {
4031			ti->error = "Invalid tag size";
4032			r = -EINVAL;
4033			goto bad;
4034		}
4035	}
4036
4037	if (!strcmp(argv[3], "J") || !strcmp(argv[3], "B") ||
4038	    !strcmp(argv[3], "D") || !strcmp(argv[3], "R")) {
4039		ic->mode = argv[3][0];
4040	} else {
4041		ti->error = "Invalid mode (expecting J, B, D, R)";
4042		r = -EINVAL;
4043		goto bad;
4044	}
4045
4046	journal_sectors = 0;
4047	interleave_sectors = DEFAULT_INTERLEAVE_SECTORS;
4048	buffer_sectors = DEFAULT_BUFFER_SECTORS;
4049	journal_watermark = DEFAULT_JOURNAL_WATERMARK;
4050	sync_msec = DEFAULT_SYNC_MSEC;
4051	ic->sectors_per_block = 1;
4052
4053	as.argc = argc - DIRECT_ARGUMENTS;
4054	as.argv = argv + DIRECT_ARGUMENTS;
4055	r = dm_read_arg_group(_args, &as, &extra_args, &ti->error);
4056	if (r)
4057		goto bad;
4058
4059	while (extra_args--) {
4060		const char *opt_string;
4061		unsigned val;
4062		unsigned long long llval;
4063		opt_string = dm_shift_arg(&as);
4064		if (!opt_string) {
4065			r = -EINVAL;
4066			ti->error = "Not enough feature arguments";
4067			goto bad;
4068		}
4069		if (sscanf(opt_string, "journal_sectors:%u%c", &val, &dummy) == 1)
4070			journal_sectors = val ? val : 1;
4071		else if (sscanf(opt_string, "interleave_sectors:%u%c", &val, &dummy) == 1)
4072			interleave_sectors = val;
4073		else if (sscanf(opt_string, "buffer_sectors:%u%c", &val, &dummy) == 1)
4074			buffer_sectors = val;
4075		else if (sscanf(opt_string, "journal_watermark:%u%c", &val, &dummy) == 1 && val <= 100)
4076			journal_watermark = val;
4077		else if (sscanf(opt_string, "commit_time:%u%c", &val, &dummy) == 1)
4078			sync_msec = val;
4079		else if (!strncmp(opt_string, "meta_device:", strlen("meta_device:"))) {
4080			if (ic->meta_dev) {
4081				dm_put_device(ti, ic->meta_dev);
4082				ic->meta_dev = NULL;
4083			}
4084			r = dm_get_device(ti, strchr(opt_string, ':') + 1,
4085					  dm_table_get_mode(ti->table), &ic->meta_dev);
4086			if (r) {
4087				ti->error = "Device lookup failed";
4088				goto bad;
4089			}
4090		} else if (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) {
4091			if (val < 1 << SECTOR_SHIFT ||
4092			    val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT ||
4093			    (val & (val -1))) {
4094				r = -EINVAL;
4095				ti->error = "Invalid block_size argument";
4096				goto bad;
4097			}
4098			ic->sectors_per_block = val >> SECTOR_SHIFT;
4099		} else if (sscanf(opt_string, "sectors_per_bit:%llu%c", &llval, &dummy) == 1) {
4100			log2_sectors_per_bitmap_bit = !llval ? 0 : __ilog2_u64(llval);
4101		} else if (sscanf(opt_string, "bitmap_flush_interval:%u%c", &val, &dummy) == 1) {
4102			if (val >= (uint64_t)UINT_MAX * 1000 / HZ) {
4103				r = -EINVAL;
4104				ti->error = "Invalid bitmap_flush_interval argument";
4105				goto bad;
4106			}
4107			ic->bitmap_flush_interval = msecs_to_jiffies(val);
4108		} else if (!strncmp(opt_string, "internal_hash:", strlen("internal_hash:"))) {
4109			r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error,
4110					    "Invalid internal_hash argument");
4111			if (r)
4112				goto bad;
4113		} else if (!strncmp(opt_string, "journal_crypt:", strlen("journal_crypt:"))) {
4114			r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error,
4115					    "Invalid journal_crypt argument");
4116			if (r)
4117				goto bad;
4118		} else if (!strncmp(opt_string, "journal_mac:", strlen("journal_mac:"))) {
4119			r = get_alg_and_key(opt_string, &ic->journal_mac_alg, &ti->error,
4120					    "Invalid journal_mac argument");
4121			if (r)
4122				goto bad;
4123		} else if (!strcmp(opt_string, "recalculate")) {
4124			ic->recalculate_flag = true;
4125		} else if (!strcmp(opt_string, "reset_recalculate")) {
4126			ic->recalculate_flag = true;
4127			ic->reset_recalculate_flag = true;
4128		} else if (!strcmp(opt_string, "allow_discards")) {
4129			ic->discard = true;
4130		} else if (!strcmp(opt_string, "fix_padding")) {
4131			ic->fix_padding = true;
4132		} else if (!strcmp(opt_string, "fix_hmac")) {
4133			ic->fix_hmac = true;
4134		} else if (!strcmp(opt_string, "legacy_recalculate")) {
4135			ic->legacy_recalculate = true;
4136		} else {
4137			r = -EINVAL;
4138			ti->error = "Invalid argument";
4139			goto bad;
4140		}
4141	}
4142
4143	ic->data_device_sectors = bdev_nr_sectors(ic->dev->bdev);
4144	if (!ic->meta_dev)
4145		ic->meta_device_sectors = ic->data_device_sectors;
4146	else
4147		ic->meta_device_sectors = bdev_nr_sectors(ic->meta_dev->bdev);
4148
4149	if (!journal_sectors) {
4150		journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS,
4151				      ic->data_device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR);
4152	}
4153
4154	if (!buffer_sectors)
4155		buffer_sectors = 1;
4156	ic->log2_buffer_sectors = min((int)__fls(buffer_sectors), 31 - SECTOR_SHIFT);
4157
4158	r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error,
4159		    "Invalid internal hash", "Error setting internal hash key");
4160	if (r)
4161		goto bad;
4162
4163	r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error,
4164		    "Invalid journal mac", "Error setting journal mac key");
4165	if (r)
4166		goto bad;
4167
4168	if (!ic->tag_size) {
4169		if (!ic->internal_hash) {
4170			ti->error = "Unknown tag size";
4171			r = -EINVAL;
4172			goto bad;
4173		}
4174		ic->tag_size = crypto_shash_digestsize(ic->internal_hash);
4175	}
4176	if (ic->tag_size > MAX_TAG_SIZE) {
4177		ti->error = "Too big tag size";
4178		r = -EINVAL;
4179		goto bad;
4180	}
4181	if (!(ic->tag_size & (ic->tag_size - 1)))
4182		ic->log2_tag_size = __ffs(ic->tag_size);
4183	else
4184		ic->log2_tag_size = -1;
4185
4186	if (ic->mode == 'B' && !ic->internal_hash) {
4187		r = -EINVAL;
4188		ti->error = "Bitmap mode can be only used with internal hash";
4189		goto bad;
4190	}
4191
4192	if (ic->discard && !ic->internal_hash) {
4193		r = -EINVAL;
4194		ti->error = "Discard can be only used with internal hash";
4195		goto bad;
4196	}
4197
4198	ic->autocommit_jiffies = msecs_to_jiffies(sync_msec);
4199	ic->autocommit_msec = sync_msec;
4200	timer_setup(&ic->autocommit_timer, autocommit_fn, 0);
4201
4202	ic->io = dm_io_client_create();
4203	if (IS_ERR(ic->io)) {
4204		r = PTR_ERR(ic->io);
4205		ic->io = NULL;
4206		ti->error = "Cannot allocate dm io";
4207		goto bad;
4208	}
4209
4210	r = mempool_init_slab_pool(&ic->journal_io_mempool, JOURNAL_IO_MEMPOOL, journal_io_cache);
4211	if (r) {
4212		ti->error = "Cannot allocate mempool";
4213		goto bad;
4214	}
4215
4216	ic->metadata_wq = alloc_workqueue("dm-integrity-metadata",
4217					  WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE);
4218	if (!ic->metadata_wq) {
4219		ti->error = "Cannot allocate workqueue";
4220		r = -ENOMEM;
4221		goto bad;
4222	}
4223
4224	/*
4225	 * If this workqueue were percpu, it would cause bio reordering
4226	 * and reduced performance.
4227	 */
4228	ic->wait_wq = alloc_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4229	if (!ic->wait_wq) {
4230		ti->error = "Cannot allocate workqueue";
4231		r = -ENOMEM;
4232		goto bad;
4233	}
4234
4235	ic->offload_wq = alloc_workqueue("dm-integrity-offload", WQ_MEM_RECLAIM,
4236					  METADATA_WORKQUEUE_MAX_ACTIVE);
4237	if (!ic->offload_wq) {
4238		ti->error = "Cannot allocate workqueue";
4239		r = -ENOMEM;
4240		goto bad;
4241	}
4242
4243	ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1);
4244	if (!ic->commit_wq) {
4245		ti->error = "Cannot allocate workqueue";
4246		r = -ENOMEM;
4247		goto bad;
4248	}
4249	INIT_WORK(&ic->commit_work, integrity_commit);
4250
4251	if (ic->mode == 'J' || ic->mode == 'B') {
4252		ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1);
4253		if (!ic->writer_wq) {
4254			ti->error = "Cannot allocate workqueue";
4255			r = -ENOMEM;
4256			goto bad;
4257		}
4258		INIT_WORK(&ic->writer_work, integrity_writer);
4259	}
4260
4261	ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL);
4262	if (!ic->sb) {
4263		r = -ENOMEM;
4264		ti->error = "Cannot allocate superblock area";
4265		goto bad;
4266	}
4267
4268	r = sync_rw_sb(ic, REQ_OP_READ);
4269	if (r) {
4270		ti->error = "Error reading superblock";
4271		goto bad;
4272	}
4273	should_write_sb = false;
4274	if (memcmp(ic->sb->magic, SB_MAGIC, 8)) {
4275		if (ic->mode != 'R') {
4276			if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) {
4277				r = -EINVAL;
4278				ti->error = "The device is not initialized";
4279				goto bad;
4280			}
4281		}
4282
4283		r = initialize_superblock(ic, journal_sectors, interleave_sectors);
4284		if (r) {
4285			ti->error = "Could not initialize superblock";
4286			goto bad;
4287		}
4288		if (ic->mode != 'R')
4289			should_write_sb = true;
4290	}
4291
4292	if (!ic->sb->version || ic->sb->version > SB_VERSION_5) {
4293		r = -EINVAL;
4294		ti->error = "Unknown version";
4295		goto bad;
4296	}
4297	if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) {
4298		r = -EINVAL;
4299		ti->error = "Tag size doesn't match the information in superblock";
4300		goto bad;
4301	}
4302	if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) {
4303		r = -EINVAL;
4304		ti->error = "Block size doesn't match the information in superblock";
4305		goto bad;
4306	}
4307	if (!le32_to_cpu(ic->sb->journal_sections)) {
4308		r = -EINVAL;
4309		ti->error = "Corrupted superblock, journal_sections is 0";
4310		goto bad;
4311	}
4312	/* make sure that ti->max_io_len doesn't overflow */
4313	if (!ic->meta_dev) {
4314		if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS ||
4315		    ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) {
4316			r = -EINVAL;
4317			ti->error = "Invalid interleave_sectors in the superblock";
4318			goto bad;
4319		}
4320	} else {
4321		if (ic->sb->log2_interleave_sectors) {
4322			r = -EINVAL;
4323			ti->error = "Invalid interleave_sectors in the superblock";
4324			goto bad;
4325		}
4326	}
4327	if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
4328		r = -EINVAL;
4329		ti->error = "Journal mac mismatch";
4330		goto bad;
4331	}
4332
4333	get_provided_data_sectors(ic);
4334	if (!ic->provided_data_sectors) {
4335		r = -EINVAL;
4336		ti->error = "The device is too small";
4337		goto bad;
4338	}
4339
4340try_smaller_buffer:
4341	r = calculate_device_limits(ic);
4342	if (r) {
4343		if (ic->meta_dev) {
4344			if (ic->log2_buffer_sectors > 3) {
4345				ic->log2_buffer_sectors--;
4346				goto try_smaller_buffer;
4347			}
4348		}
4349		ti->error = "The device is too small";
4350		goto bad;
4351	}
4352
4353	if (log2_sectors_per_bitmap_bit < 0)
4354		log2_sectors_per_bitmap_bit = __fls(DEFAULT_SECTORS_PER_BITMAP_BIT);
4355	if (log2_sectors_per_bitmap_bit < ic->sb->log2_sectors_per_block)
4356		log2_sectors_per_bitmap_bit = ic->sb->log2_sectors_per_block;
4357
4358	bits_in_journal = ((__u64)ic->journal_section_sectors * ic->journal_sections) << (SECTOR_SHIFT + 3);
4359	if (bits_in_journal > UINT_MAX)
4360		bits_in_journal = UINT_MAX;
4361	while (bits_in_journal < (ic->provided_data_sectors + ((sector_t)1 << log2_sectors_per_bitmap_bit) - 1) >> log2_sectors_per_bitmap_bit)
4362		log2_sectors_per_bitmap_bit++;
4363
4364	log2_blocks_per_bitmap_bit = log2_sectors_per_bitmap_bit - ic->sb->log2_sectors_per_block;
4365	ic->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
4366	if (should_write_sb) {
4367		ic->sb->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit;
4368	}
4369	n_bitmap_bits = ((ic->provided_data_sectors >> ic->sb->log2_sectors_per_block)
4370				+ (((sector_t)1 << log2_blocks_per_bitmap_bit) - 1)) >> log2_blocks_per_bitmap_bit;
4371	ic->n_bitmap_blocks = DIV_ROUND_UP(n_bitmap_bits, BITMAP_BLOCK_SIZE * 8);
4372
4373	if (!ic->meta_dev)
4374		ic->log2_buffer_sectors = min(ic->log2_buffer_sectors, (__u8)__ffs(ic->metadata_run));
4375
4376	if (ti->len > ic->provided_data_sectors) {
4377		r = -EINVAL;
4378		ti->error = "Not enough provided sectors for requested mapping size";
4379		goto bad;
4380	}
4381
4382
4383	threshold = (__u64)ic->journal_entries * (100 - journal_watermark);
4384	threshold += 50;
4385	do_div(threshold, 100);
4386	ic->free_sectors_threshold = threshold;
4387
4388	DEBUG_print("initialized:\n");
4389	DEBUG_print("	integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size));
4390	DEBUG_print("	journal_entry_size %u\n", ic->journal_entry_size);
4391	DEBUG_print("	journal_entries_per_sector %u\n", ic->journal_entries_per_sector);
4392	DEBUG_print("	journal_section_entries %u\n", ic->journal_section_entries);
4393	DEBUG_print("	journal_section_sectors %u\n", ic->journal_section_sectors);
4394	DEBUG_print("	journal_sections %u\n", (unsigned)le32_to_cpu(ic->sb->journal_sections));
4395	DEBUG_print("	journal_entries %u\n", ic->journal_entries);
4396	DEBUG_print("	log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors);
4397	DEBUG_print("	data_device_sectors 0x%llx\n", bdev_nr_sectors(ic->dev->bdev));
4398	DEBUG_print("	initial_sectors 0x%x\n", ic->initial_sectors);
4399	DEBUG_print("	metadata_run 0x%x\n", ic->metadata_run);
4400	DEBUG_print("	log2_metadata_run %d\n", ic->log2_metadata_run);
4401	DEBUG_print("	provided_data_sectors 0x%llx (%llu)\n", ic->provided_data_sectors, ic->provided_data_sectors);
4402	DEBUG_print("	log2_buffer_sectors %u\n", ic->log2_buffer_sectors);
4403	DEBUG_print("	bits_in_journal %llu\n", bits_in_journal);
4404
4405	if (ic->recalculate_flag && !(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))) {
4406		ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
4407		ic->sb->recalc_sector = cpu_to_le64(0);
4408	}
4409
4410	if (ic->internal_hash) {
4411		size_t recalc_tags_size;
4412		ic->recalc_wq = alloc_workqueue("dm-integrity-recalc", WQ_MEM_RECLAIM, 1);
4413		if (!ic->recalc_wq ) {
4414			ti->error = "Cannot allocate workqueue";
4415			r = -ENOMEM;
4416			goto bad;
4417		}
4418		INIT_WORK(&ic->recalc_work, integrity_recalc);
4419		ic->recalc_buffer = vmalloc(RECALC_SECTORS << SECTOR_SHIFT);
4420		if (!ic->recalc_buffer) {
4421			ti->error = "Cannot allocate buffer for recalculating";
4422			r = -ENOMEM;
4423			goto bad;
4424		}
4425		recalc_tags_size = (RECALC_SECTORS >> ic->sb->log2_sectors_per_block) * ic->tag_size;
4426		if (crypto_shash_digestsize(ic->internal_hash) > ic->tag_size)
4427			recalc_tags_size += crypto_shash_digestsize(ic->internal_hash) - ic->tag_size;
4428		ic->recalc_tags = kvmalloc(recalc_tags_size, GFP_KERNEL);
4429		if (!ic->recalc_tags) {
4430			ti->error = "Cannot allocate tags for recalculating";
4431			r = -ENOMEM;
4432			goto bad;
4433		}
4434	} else {
4435		if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) {
4436			ti->error = "Recalculate can only be specified with internal_hash";
4437			r = -EINVAL;
4438			goto bad;
4439		}
4440	}
4441
4442	if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
4443	    le64_to_cpu(ic->sb->recalc_sector) < ic->provided_data_sectors &&
4444	    dm_integrity_disable_recalculate(ic)) {
4445		ti->error = "Recalculating with HMAC is disabled for security reasons - if you really need it, use the argument \"legacy_recalculate\"";
4446		r = -EOPNOTSUPP;
4447		goto bad;
4448	}
4449
4450	ic->bufio = dm_bufio_client_create(ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev,
4451			1U << (SECTOR_SHIFT + ic->log2_buffer_sectors), 1, 0, NULL, NULL, 0);
4452	if (IS_ERR(ic->bufio)) {
4453		r = PTR_ERR(ic->bufio);
4454		ti->error = "Cannot initialize dm-bufio";
4455		ic->bufio = NULL;
4456		goto bad;
4457	}
4458	dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors);
4459
4460	if (ic->mode != 'R') {
4461		r = create_journal(ic, &ti->error);
4462		if (r)
4463			goto bad;
4464
4465	}
4466
4467	if (ic->mode == 'B') {
4468		unsigned i;
4469		unsigned n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE);
4470
4471		ic->recalc_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4472		if (!ic->recalc_bitmap) {
4473			r = -ENOMEM;
4474			goto bad;
4475		}
4476		ic->may_write_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages);
4477		if (!ic->may_write_bitmap) {
4478			r = -ENOMEM;
4479			goto bad;
4480		}
4481		ic->bbs = kvmalloc_array(ic->n_bitmap_blocks, sizeof(struct bitmap_block_status), GFP_KERNEL);
4482		if (!ic->bbs) {
4483			r = -ENOMEM;
4484			goto bad;
4485		}
4486		INIT_DELAYED_WORK(&ic->bitmap_flush_work, bitmap_flush_work);
4487		for (i = 0; i < ic->n_bitmap_blocks; i++) {
4488			struct bitmap_block_status *bbs = &ic->bbs[i];
4489			unsigned sector, pl_index, pl_offset;
4490
4491			INIT_WORK(&bbs->work, bitmap_block_work);
4492			bbs->ic = ic;
4493			bbs->idx = i;
4494			bio_list_init(&bbs->bio_queue);
4495			spin_lock_init(&bbs->bio_queue_lock);
4496
4497			sector = i * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT);
4498			pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT);
4499			pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1);
4500
4501			bbs->bitmap = lowmem_page_address(ic->journal[pl_index].page) + pl_offset;
4502		}
4503	}
4504
4505	if (should_write_sb) {
 
 
4506		init_journal(ic, 0, ic->journal_sections, 0);
4507		r = dm_integrity_failed(ic);
4508		if (unlikely(r)) {
4509			ti->error = "Error initializing journal";
4510			goto bad;
4511		}
4512		r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA);
4513		if (r) {
4514			ti->error = "Error initializing superblock";
4515			goto bad;
4516		}
4517		ic->just_formatted = true;
4518	}
4519
4520	if (!ic->meta_dev) {
4521		r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors);
4522		if (r)
4523			goto bad;
4524	}
4525	if (ic->mode == 'B') {
4526		unsigned max_io_len = ((sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit) * (BITMAP_BLOCK_SIZE * 8);
4527		if (!max_io_len)
4528			max_io_len = 1U << 31;
4529		DEBUG_print("max_io_len: old %u, new %u\n", ti->max_io_len, max_io_len);
4530		if (!ti->max_io_len || ti->max_io_len > max_io_len) {
4531			r = dm_set_target_max_io_len(ti, max_io_len);
4532			if (r)
4533				goto bad;
4534		}
4535	}
4536
4537	if (!ic->internal_hash)
4538		dm_integrity_set(ti, ic);
4539
4540	ti->num_flush_bios = 1;
4541	ti->flush_supported = true;
4542	if (ic->discard)
4543		ti->num_discard_bios = 1;
4544
4545	dm_audit_log_ctr(DM_MSG_PREFIX, ti, 1);
4546	return 0;
4547
4548bad:
4549	dm_audit_log_ctr(DM_MSG_PREFIX, ti, 0);
4550	dm_integrity_dtr(ti);
4551	return r;
4552}
4553
4554static void dm_integrity_dtr(struct dm_target *ti)
4555{
4556	struct dm_integrity_c *ic = ti->private;
4557
4558	BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
4559	BUG_ON(!list_empty(&ic->wait_list));
4560
4561	if (ic->mode == 'B')
4562		cancel_delayed_work_sync(&ic->bitmap_flush_work);
4563	if (ic->metadata_wq)
4564		destroy_workqueue(ic->metadata_wq);
4565	if (ic->wait_wq)
4566		destroy_workqueue(ic->wait_wq);
4567	if (ic->offload_wq)
4568		destroy_workqueue(ic->offload_wq);
4569	if (ic->commit_wq)
4570		destroy_workqueue(ic->commit_wq);
4571	if (ic->writer_wq)
4572		destroy_workqueue(ic->writer_wq);
4573	if (ic->recalc_wq)
4574		destroy_workqueue(ic->recalc_wq);
4575	vfree(ic->recalc_buffer);
4576	kvfree(ic->recalc_tags);
4577	kvfree(ic->bbs);
4578	if (ic->bufio)
4579		dm_bufio_client_destroy(ic->bufio);
4580	mempool_exit(&ic->journal_io_mempool);
4581	if (ic->io)
4582		dm_io_client_destroy(ic->io);
4583	if (ic->dev)
4584		dm_put_device(ti, ic->dev);
4585	if (ic->meta_dev)
4586		dm_put_device(ti, ic->meta_dev);
4587	dm_integrity_free_page_list(ic->journal);
4588	dm_integrity_free_page_list(ic->journal_io);
4589	dm_integrity_free_page_list(ic->journal_xor);
4590	dm_integrity_free_page_list(ic->recalc_bitmap);
4591	dm_integrity_free_page_list(ic->may_write_bitmap);
4592	if (ic->journal_scatterlist)
4593		dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist);
4594	if (ic->journal_io_scatterlist)
4595		dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist);
4596	if (ic->sk_requests) {
4597		unsigned i;
4598
4599		for (i = 0; i < ic->journal_sections; i++) {
4600			struct skcipher_request *req = ic->sk_requests[i];
4601			if (req) {
4602				kfree_sensitive(req->iv);
4603				skcipher_request_free(req);
4604			}
4605		}
4606		kvfree(ic->sk_requests);
4607	}
4608	kvfree(ic->journal_tree);
4609	if (ic->sb)
4610		free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT);
4611
4612	if (ic->internal_hash)
4613		crypto_free_shash(ic->internal_hash);
4614	free_alg(&ic->internal_hash_alg);
4615
4616	if (ic->journal_crypt)
4617		crypto_free_skcipher(ic->journal_crypt);
4618	free_alg(&ic->journal_crypt_alg);
4619
4620	if (ic->journal_mac)
4621		crypto_free_shash(ic->journal_mac);
4622	free_alg(&ic->journal_mac_alg);
4623
4624	kfree(ic);
4625	dm_audit_log_dtr(DM_MSG_PREFIX, ti, 1);
4626}
4627
4628static struct target_type integrity_target = {
4629	.name			= "integrity",
4630	.version		= {1, 10, 0},
4631	.module			= THIS_MODULE,
4632	.features		= DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
4633	.ctr			= dm_integrity_ctr,
4634	.dtr			= dm_integrity_dtr,
4635	.map			= dm_integrity_map,
4636	.postsuspend		= dm_integrity_postsuspend,
4637	.resume			= dm_integrity_resume,
4638	.status			= dm_integrity_status,
4639	.iterate_devices	= dm_integrity_iterate_devices,
4640	.io_hints		= dm_integrity_io_hints,
4641};
4642
4643static int __init dm_integrity_init(void)
4644{
4645	int r;
4646
4647	journal_io_cache = kmem_cache_create("integrity_journal_io",
4648					     sizeof(struct journal_io), 0, 0, NULL);
4649	if (!journal_io_cache) {
4650		DMERR("can't allocate journal io cache");
4651		return -ENOMEM;
4652	}
4653
4654	r = dm_register_target(&integrity_target);
4655
4656	if (r < 0)
4657		DMERR("register failed %d", r);
4658
4659	return r;
4660}
4661
4662static void __exit dm_integrity_exit(void)
4663{
4664	dm_unregister_target(&integrity_target);
4665	kmem_cache_destroy(journal_io_cache);
4666}
4667
4668module_init(dm_integrity_init);
4669module_exit(dm_integrity_exit);
4670
4671MODULE_AUTHOR("Milan Broz");
4672MODULE_AUTHOR("Mikulas Patocka");
4673MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension");
4674MODULE_LICENSE("GPL");