diff options
Diffstat (limited to 'drivers/md/dm-integrity.c')
| -rw-r--r-- | drivers/md/dm-integrity.c | 4719 |
1 files changed, 4719 insertions, 0 deletions
diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c new file mode 100644 index 0000000000..9261bbebd6 --- /dev/null +++ b/drivers/md/dm-integrity.c @@ -0,0 +1,4719 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2016-2017 Red Hat, Inc. All rights reserved. + * Copyright (C) 2016-2017 Milan Broz + * Copyright (C) 2016-2017 Mikulas Patocka + * + * This file is released under the GPL. + */ + +#include "dm-bio-record.h" + +#include <linux/compiler.h> +#include <linux/module.h> +#include <linux/device-mapper.h> +#include <linux/dm-io.h> +#include <linux/vmalloc.h> +#include <linux/sort.h> +#include <linux/rbtree.h> +#include <linux/delay.h> +#include <linux/random.h> +#include <linux/reboot.h> +#include <crypto/hash.h> +#include <crypto/skcipher.h> +#include <linux/async_tx.h> +#include <linux/dm-bufio.h> + +#include "dm-audit.h" + +#define DM_MSG_PREFIX "integrity" + +#define DEFAULT_INTERLEAVE_SECTORS 32768 +#define DEFAULT_JOURNAL_SIZE_FACTOR 7 +#define DEFAULT_SECTORS_PER_BITMAP_BIT 32768 +#define DEFAULT_BUFFER_SECTORS 128 +#define DEFAULT_JOURNAL_WATERMARK 50 +#define DEFAULT_SYNC_MSEC 10000 +#define DEFAULT_MAX_JOURNAL_SECTORS (IS_ENABLED(CONFIG_64BIT) ? 131072 : 8192) +#define MIN_LOG2_INTERLEAVE_SECTORS 3 +#define MAX_LOG2_INTERLEAVE_SECTORS 31 +#define METADATA_WORKQUEUE_MAX_ACTIVE 16 +#define RECALC_SECTORS (IS_ENABLED(CONFIG_64BIT) ? 32768 : 2048) +#define RECALC_WRITE_SUPER 16 +#define BITMAP_BLOCK_SIZE 4096 /* don't change it */ +#define BITMAP_FLUSH_INTERVAL (10 * HZ) +#define DISCARD_FILLER 0xf6 +#define SALT_SIZE 16 + +/* + * Warning - DEBUG_PRINT prints security-sensitive data to the log, + * so it should not be enabled in the official kernel + */ +//#define DEBUG_PRINT +//#define INTERNAL_VERIFY + +/* + * On disk structures + */ + +#define SB_MAGIC "integrt" +#define SB_VERSION_1 1 +#define SB_VERSION_2 2 +#define SB_VERSION_3 3 +#define SB_VERSION_4 4 +#define SB_VERSION_5 5 +#define SB_SECTORS 8 +#define MAX_SECTORS_PER_BLOCK 8 + +struct superblock { + __u8 magic[8]; + __u8 version; + __u8 log2_interleave_sectors; + __le16 integrity_tag_size; + __le32 journal_sections; + __le64 provided_data_sectors; /* userspace uses this value */ + __le32 flags; + __u8 log2_sectors_per_block; + __u8 log2_blocks_per_bitmap_bit; + __u8 pad[2]; + __le64 recalc_sector; + __u8 pad2[8]; + __u8 salt[SALT_SIZE]; +}; + +#define SB_FLAG_HAVE_JOURNAL_MAC 0x1 +#define SB_FLAG_RECALCULATING 0x2 +#define SB_FLAG_DIRTY_BITMAP 0x4 +#define SB_FLAG_FIXED_PADDING 0x8 +#define SB_FLAG_FIXED_HMAC 0x10 + +#define JOURNAL_ENTRY_ROUNDUP 8 + +typedef __le64 commit_id_t; +#define JOURNAL_MAC_PER_SECTOR 8 + +struct journal_entry { + union { + struct { + __le32 sector_lo; + __le32 sector_hi; + } s; + __le64 sector; + } u; + commit_id_t last_bytes[]; + /* __u8 tag[0]; */ +}; + +#define journal_entry_tag(ic, je) ((__u8 *)&(je)->last_bytes[(ic)->sectors_per_block]) + +#if BITS_PER_LONG == 64 +#define journal_entry_set_sector(je, x) do { smp_wmb(); WRITE_ONCE((je)->u.sector, cpu_to_le64(x)); } while (0) +#else +#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) +#endif +#define journal_entry_get_sector(je) le64_to_cpu((je)->u.sector) +#define journal_entry_is_unused(je) ((je)->u.s.sector_hi == cpu_to_le32(-1)) +#define journal_entry_set_unused(je) ((je)->u.s.sector_hi = cpu_to_le32(-1)) +#define journal_entry_is_inprogress(je) ((je)->u.s.sector_hi == cpu_to_le32(-2)) +#define journal_entry_set_inprogress(je) ((je)->u.s.sector_hi = cpu_to_le32(-2)) + +#define JOURNAL_BLOCK_SECTORS 8 +#define JOURNAL_SECTOR_DATA ((1 << SECTOR_SHIFT) - sizeof(commit_id_t)) +#define JOURNAL_MAC_SIZE (JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS) + +struct journal_sector { + struct_group(sectors, + __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR]; + __u8 mac[JOURNAL_MAC_PER_SECTOR]; + ); + commit_id_t commit_id; +}; + +#define MAX_TAG_SIZE (JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR - offsetof(struct journal_entry, last_bytes[MAX_SECTORS_PER_BLOCK])) + +#define METADATA_PADDING_SECTORS 8 + +#define N_COMMIT_IDS 4 + +static unsigned char prev_commit_seq(unsigned char seq) +{ + return (seq + N_COMMIT_IDS - 1) % N_COMMIT_IDS; +} + +static unsigned char next_commit_seq(unsigned char seq) +{ + return (seq + 1) % N_COMMIT_IDS; +} + +/* + * In-memory structures + */ + +struct journal_node { + struct rb_node node; + sector_t sector; +}; + +struct alg_spec { + char *alg_string; + char *key_string; + __u8 *key; + unsigned int key_size; +}; + +struct dm_integrity_c { + struct dm_dev *dev; + struct dm_dev *meta_dev; + unsigned int tag_size; + __s8 log2_tag_size; + sector_t start; + mempool_t journal_io_mempool; + struct dm_io_client *io; + struct dm_bufio_client *bufio; + struct workqueue_struct *metadata_wq; + struct superblock *sb; + unsigned int journal_pages; + unsigned int n_bitmap_blocks; + + struct page_list *journal; + struct page_list *journal_io; + struct page_list *journal_xor; + struct page_list *recalc_bitmap; + struct page_list *may_write_bitmap; + struct bitmap_block_status *bbs; + unsigned int bitmap_flush_interval; + int synchronous_mode; + struct bio_list synchronous_bios; + struct delayed_work bitmap_flush_work; + + struct crypto_skcipher *journal_crypt; + struct scatterlist **journal_scatterlist; + struct scatterlist **journal_io_scatterlist; + struct skcipher_request **sk_requests; + + struct crypto_shash *journal_mac; + + struct journal_node *journal_tree; + struct rb_root journal_tree_root; + + sector_t provided_data_sectors; + + unsigned short journal_entry_size; + unsigned char journal_entries_per_sector; + unsigned char journal_section_entries; + unsigned short journal_section_sectors; + unsigned int journal_sections; + unsigned int journal_entries; + sector_t data_device_sectors; + sector_t meta_device_sectors; + unsigned int initial_sectors; + unsigned int metadata_run; + __s8 log2_metadata_run; + __u8 log2_buffer_sectors; + __u8 sectors_per_block; + __u8 log2_blocks_per_bitmap_bit; + + unsigned char mode; + + int failed; + + struct crypto_shash *internal_hash; + + struct dm_target *ti; + + /* these variables are locked with endio_wait.lock */ + struct rb_root in_progress; + struct list_head wait_list; + wait_queue_head_t endio_wait; + struct workqueue_struct *wait_wq; + struct workqueue_struct *offload_wq; + + unsigned char commit_seq; + commit_id_t commit_ids[N_COMMIT_IDS]; + + unsigned int committed_section; + unsigned int n_committed_sections; + + unsigned int uncommitted_section; + unsigned int n_uncommitted_sections; + + unsigned int free_section; + unsigned char free_section_entry; + unsigned int free_sectors; + + unsigned int free_sectors_threshold; + + struct workqueue_struct *commit_wq; + struct work_struct commit_work; + + struct workqueue_struct *writer_wq; + struct work_struct writer_work; + + struct workqueue_struct *recalc_wq; + struct work_struct recalc_work; + + struct bio_list flush_bio_list; + + unsigned long autocommit_jiffies; + struct timer_list autocommit_timer; + unsigned int autocommit_msec; + + wait_queue_head_t copy_to_journal_wait; + + struct completion crypto_backoff; + + bool wrote_to_journal; + bool journal_uptodate; + bool just_formatted; + bool recalculate_flag; + bool reset_recalculate_flag; + bool discard; + bool fix_padding; + bool fix_hmac; + bool legacy_recalculate; + + struct alg_spec internal_hash_alg; + struct alg_spec journal_crypt_alg; + struct alg_spec journal_mac_alg; + + atomic64_t number_of_mismatches; + + struct notifier_block reboot_notifier; +}; + +struct dm_integrity_range { + sector_t logical_sector; + sector_t n_sectors; + bool waiting; + union { + struct rb_node node; + struct { + struct task_struct *task; + struct list_head wait_entry; + }; + }; +}; + +struct dm_integrity_io { + struct work_struct work; + + struct dm_integrity_c *ic; + enum req_op op; + bool fua; + + struct dm_integrity_range range; + + sector_t metadata_block; + unsigned int metadata_offset; + + atomic_t in_flight; + blk_status_t bi_status; + + struct completion *completion; + + struct dm_bio_details bio_details; +}; + +struct journal_completion { + struct dm_integrity_c *ic; + atomic_t in_flight; + struct completion comp; +}; + +struct journal_io { + struct dm_integrity_range range; + struct journal_completion *comp; +}; + +struct bitmap_block_status { + struct work_struct work; + struct dm_integrity_c *ic; + unsigned int idx; + unsigned long *bitmap; + struct bio_list bio_queue; + spinlock_t bio_queue_lock; + +}; + +static struct kmem_cache *journal_io_cache; + +#define JOURNAL_IO_MEMPOOL 32 + +#ifdef DEBUG_PRINT +#define DEBUG_print(x, ...) printk(KERN_DEBUG x, ##__VA_ARGS__) +#define DEBUG_bytes(bytes, len, msg, ...) printk(KERN_DEBUG msg "%s%*ph\n", ##__VA_ARGS__, \ + len ? ": " : "", len, bytes) +#else +#define DEBUG_print(x, ...) do { } while (0) +#define DEBUG_bytes(bytes, len, msg, ...) do { } while (0) +#endif + +static void dm_integrity_prepare(struct request *rq) +{ +} + +static void dm_integrity_complete(struct request *rq, unsigned int nr_bytes) +{ +} + +/* + * DM Integrity profile, protection is performed layer above (dm-crypt) + */ +static const struct blk_integrity_profile dm_integrity_profile = { + .name = "DM-DIF-EXT-TAG", + .generate_fn = NULL, + .verify_fn = NULL, + .prepare_fn = dm_integrity_prepare, + .complete_fn = dm_integrity_complete, +}; + +static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map); +static void integrity_bio_wait(struct work_struct *w); +static void dm_integrity_dtr(struct dm_target *ti); + +static void dm_integrity_io_error(struct dm_integrity_c *ic, const char *msg, int err) +{ + if (err == -EILSEQ) + atomic64_inc(&ic->number_of_mismatches); + if (!cmpxchg(&ic->failed, 0, err)) + DMERR("Error on %s: %d", msg, err); +} + +static int dm_integrity_failed(struct dm_integrity_c *ic) +{ + return READ_ONCE(ic->failed); +} + +static bool dm_integrity_disable_recalculate(struct dm_integrity_c *ic) +{ + if (ic->legacy_recalculate) + return false; + if (!(ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) ? + ic->internal_hash_alg.key || ic->journal_mac_alg.key : + ic->internal_hash_alg.key && !ic->journal_mac_alg.key) + return true; + return false; +} + +static commit_id_t dm_integrity_commit_id(struct dm_integrity_c *ic, unsigned int i, + unsigned int j, unsigned char seq) +{ + /* + * Xor the number with section and sector, so that if a piece of + * journal is written at wrong place, it is detected. + */ + return ic->commit_ids[seq] ^ cpu_to_le64(((__u64)i << 32) ^ j); +} + +static void get_area_and_offset(struct dm_integrity_c *ic, sector_t data_sector, + sector_t *area, sector_t *offset) +{ + if (!ic->meta_dev) { + __u8 log2_interleave_sectors = ic->sb->log2_interleave_sectors; + *area = data_sector >> log2_interleave_sectors; + *offset = (unsigned int)data_sector & ((1U << log2_interleave_sectors) - 1); + } else { + *area = 0; + *offset = data_sector; + } +} + +#define sector_to_block(ic, n) \ +do { \ + BUG_ON((n) & (unsigned int)((ic)->sectors_per_block - 1)); \ + (n) >>= (ic)->sb->log2_sectors_per_block; \ +} while (0) + +static __u64 get_metadata_sector_and_offset(struct dm_integrity_c *ic, sector_t area, + sector_t offset, unsigned int *metadata_offset) +{ + __u64 ms; + unsigned int mo; + + ms = area << ic->sb->log2_interleave_sectors; + if (likely(ic->log2_metadata_run >= 0)) + ms += area << ic->log2_metadata_run; + else + ms += area * ic->metadata_run; + ms >>= ic->log2_buffer_sectors; + + sector_to_block(ic, offset); + + if (likely(ic->log2_tag_size >= 0)) { + ms += offset >> (SECTOR_SHIFT + ic->log2_buffer_sectors - ic->log2_tag_size); + mo = (offset << ic->log2_tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1); + } else { + ms += (__u64)offset * ic->tag_size >> (SECTOR_SHIFT + ic->log2_buffer_sectors); + mo = (offset * ic->tag_size) & ((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - 1); + } + *metadata_offset = mo; + return ms; +} + +static sector_t get_data_sector(struct dm_integrity_c *ic, sector_t area, sector_t offset) +{ + sector_t result; + + if (ic->meta_dev) + return offset; + + result = area << ic->sb->log2_interleave_sectors; + if (likely(ic->log2_metadata_run >= 0)) + result += (area + 1) << ic->log2_metadata_run; + else + result += (area + 1) * ic->metadata_run; + + result += (sector_t)ic->initial_sectors + offset; + result += ic->start; + + return result; +} + +static void wraparound_section(struct dm_integrity_c *ic, unsigned int *sec_ptr) +{ + if (unlikely(*sec_ptr >= ic->journal_sections)) + *sec_ptr -= ic->journal_sections; +} + +static void sb_set_version(struct dm_integrity_c *ic) +{ + if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) + ic->sb->version = SB_VERSION_5; + else if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) + ic->sb->version = SB_VERSION_4; + else if (ic->mode == 'B' || ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP)) + ic->sb->version = SB_VERSION_3; + else if (ic->meta_dev || ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) + ic->sb->version = SB_VERSION_2; + else + ic->sb->version = SB_VERSION_1; +} + +static int sb_mac(struct dm_integrity_c *ic, bool wr) +{ + SHASH_DESC_ON_STACK(desc, ic->journal_mac); + int r; + unsigned int size = crypto_shash_digestsize(ic->journal_mac); + + if (sizeof(struct superblock) + size > 1 << SECTOR_SHIFT) { + dm_integrity_io_error(ic, "digest is too long", -EINVAL); + return -EINVAL; + } + + desc->tfm = ic->journal_mac; + + r = crypto_shash_init(desc); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_init", r); + return r; + } + + r = crypto_shash_update(desc, (__u8 *)ic->sb, (1 << SECTOR_SHIFT) - size); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_update", r); + return r; + } + + if (likely(wr)) { + r = crypto_shash_final(desc, (__u8 *)ic->sb + (1 << SECTOR_SHIFT) - size); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_final", r); + return r; + } + } else { + __u8 result[HASH_MAX_DIGESTSIZE]; + + r = crypto_shash_final(desc, result); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_final", r); + return r; + } + if (memcmp((__u8 *)ic->sb + (1 << SECTOR_SHIFT) - size, result, size)) { + dm_integrity_io_error(ic, "superblock mac", -EILSEQ); + dm_audit_log_target(DM_MSG_PREFIX, "mac-superblock", ic->ti, 0); + return -EILSEQ; + } + } + + return 0; +} + +static int sync_rw_sb(struct dm_integrity_c *ic, blk_opf_t opf) +{ + struct dm_io_request io_req; + struct dm_io_region io_loc; + const enum req_op op = opf & REQ_OP_MASK; + int r; + + io_req.bi_opf = opf; + io_req.mem.type = DM_IO_KMEM; + io_req.mem.ptr.addr = ic->sb; + io_req.notify.fn = NULL; + io_req.client = ic->io; + io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev; + io_loc.sector = ic->start; + io_loc.count = SB_SECTORS; + + if (op == REQ_OP_WRITE) { + sb_set_version(ic); + if (ic->journal_mac && ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) { + r = sb_mac(ic, true); + if (unlikely(r)) + return r; + } + } + + r = dm_io(&io_req, 1, &io_loc, NULL); + if (unlikely(r)) + return r; + + if (op == REQ_OP_READ) { + if (ic->mode != 'R' && ic->journal_mac && ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) { + r = sb_mac(ic, false); + if (unlikely(r)) + return r; + } + } + + return 0; +} + +#define BITMAP_OP_TEST_ALL_SET 0 +#define BITMAP_OP_TEST_ALL_CLEAR 1 +#define BITMAP_OP_SET 2 +#define BITMAP_OP_CLEAR 3 + +static bool block_bitmap_op(struct dm_integrity_c *ic, struct page_list *bitmap, + sector_t sector, sector_t n_sectors, int mode) +{ + unsigned long bit, end_bit, this_end_bit, page, end_page; + unsigned long *data; + + if (unlikely(((sector | n_sectors) & ((1 << ic->sb->log2_sectors_per_block) - 1)) != 0)) { + DMCRIT("invalid bitmap access (%llx,%llx,%d,%d,%d)", + sector, + n_sectors, + ic->sb->log2_sectors_per_block, + ic->log2_blocks_per_bitmap_bit, + mode); + BUG(); + } + + if (unlikely(!n_sectors)) + return true; + + bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit); + end_bit = (sector + n_sectors - 1) >> + (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit); + + page = bit / (PAGE_SIZE * 8); + bit %= PAGE_SIZE * 8; + + end_page = end_bit / (PAGE_SIZE * 8); + end_bit %= PAGE_SIZE * 8; + +repeat: + if (page < end_page) + this_end_bit = PAGE_SIZE * 8 - 1; + else + this_end_bit = end_bit; + + data = lowmem_page_address(bitmap[page].page); + + if (mode == BITMAP_OP_TEST_ALL_SET) { + while (bit <= this_end_bit) { + if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) { + do { + if (data[bit / BITS_PER_LONG] != -1) + return false; + bit += BITS_PER_LONG; + } while (this_end_bit >= bit + BITS_PER_LONG - 1); + continue; + } + if (!test_bit(bit, data)) + return false; + bit++; + } + } else if (mode == BITMAP_OP_TEST_ALL_CLEAR) { + while (bit <= this_end_bit) { + if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) { + do { + if (data[bit / BITS_PER_LONG] != 0) + return false; + bit += BITS_PER_LONG; + } while (this_end_bit >= bit + BITS_PER_LONG - 1); + continue; + } + if (test_bit(bit, data)) + return false; + bit++; + } + } else if (mode == BITMAP_OP_SET) { + while (bit <= this_end_bit) { + if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) { + do { + data[bit / BITS_PER_LONG] = -1; + bit += BITS_PER_LONG; + } while (this_end_bit >= bit + BITS_PER_LONG - 1); + continue; + } + __set_bit(bit, data); + bit++; + } + } else if (mode == BITMAP_OP_CLEAR) { + if (!bit && this_end_bit == PAGE_SIZE * 8 - 1) + clear_page(data); + else { + while (bit <= this_end_bit) { + if (!(bit % BITS_PER_LONG) && this_end_bit >= bit + BITS_PER_LONG - 1) { + do { + data[bit / BITS_PER_LONG] = 0; + bit += BITS_PER_LONG; + } while (this_end_bit >= bit + BITS_PER_LONG - 1); + continue; + } + __clear_bit(bit, data); + bit++; + } + } + } else { + BUG(); + } + + if (unlikely(page < end_page)) { + bit = 0; + page++; + goto repeat; + } + + return true; +} + +static void block_bitmap_copy(struct dm_integrity_c *ic, struct page_list *dst, struct page_list *src) +{ + unsigned int n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE); + unsigned int i; + + for (i = 0; i < n_bitmap_pages; i++) { + unsigned long *dst_data = lowmem_page_address(dst[i].page); + unsigned long *src_data = lowmem_page_address(src[i].page); + + copy_page(dst_data, src_data); + } +} + +static struct bitmap_block_status *sector_to_bitmap_block(struct dm_integrity_c *ic, sector_t sector) +{ + unsigned int bit = sector >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit); + unsigned int bitmap_block = bit / (BITMAP_BLOCK_SIZE * 8); + + BUG_ON(bitmap_block >= ic->n_bitmap_blocks); + return &ic->bbs[bitmap_block]; +} + +static void access_journal_check(struct dm_integrity_c *ic, unsigned int section, unsigned int offset, + bool e, const char *function) +{ +#if defined(CONFIG_DM_DEBUG) || defined(INTERNAL_VERIFY) + unsigned int limit = e ? ic->journal_section_entries : ic->journal_section_sectors; + + if (unlikely(section >= ic->journal_sections) || + unlikely(offset >= limit)) { + DMCRIT("%s: invalid access at (%u,%u), limit (%u,%u)", + function, section, offset, ic->journal_sections, limit); + BUG(); + } +#endif +} + +static void page_list_location(struct dm_integrity_c *ic, unsigned int section, unsigned int offset, + unsigned int *pl_index, unsigned int *pl_offset) +{ + unsigned int sector; + + access_journal_check(ic, section, offset, false, "page_list_location"); + + sector = section * ic->journal_section_sectors + offset; + + *pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT); + *pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1); +} + +static struct journal_sector *access_page_list(struct dm_integrity_c *ic, struct page_list *pl, + unsigned int section, unsigned int offset, unsigned int *n_sectors) +{ + unsigned int pl_index, pl_offset; + char *va; + + page_list_location(ic, section, offset, &pl_index, &pl_offset); + + if (n_sectors) + *n_sectors = (PAGE_SIZE - pl_offset) >> SECTOR_SHIFT; + + va = lowmem_page_address(pl[pl_index].page); + + return (struct journal_sector *)(va + pl_offset); +} + +static struct journal_sector *access_journal(struct dm_integrity_c *ic, unsigned int section, unsigned int offset) +{ + return access_page_list(ic, ic->journal, section, offset, NULL); +} + +static struct journal_entry *access_journal_entry(struct dm_integrity_c *ic, unsigned int section, unsigned int n) +{ + unsigned int rel_sector, offset; + struct journal_sector *js; + + access_journal_check(ic, section, n, true, "access_journal_entry"); + + rel_sector = n % JOURNAL_BLOCK_SECTORS; + offset = n / JOURNAL_BLOCK_SECTORS; + + js = access_journal(ic, section, rel_sector); + return (struct journal_entry *)((char *)js + offset * ic->journal_entry_size); +} + +static struct journal_sector *access_journal_data(struct dm_integrity_c *ic, unsigned int section, unsigned int n) +{ + n <<= ic->sb->log2_sectors_per_block; + + n += JOURNAL_BLOCK_SECTORS; + + access_journal_check(ic, section, n, false, "access_journal_data"); + + return access_journal(ic, section, n); +} + +static void section_mac(struct dm_integrity_c *ic, unsigned int section, __u8 result[JOURNAL_MAC_SIZE]) +{ + SHASH_DESC_ON_STACK(desc, ic->journal_mac); + int r; + unsigned int j, size; + + desc->tfm = ic->journal_mac; + + r = crypto_shash_init(desc); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_init", r); + goto err; + } + + if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) { + __le64 section_le; + + r = crypto_shash_update(desc, (__u8 *)&ic->sb->salt, SALT_SIZE); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_update", r); + goto err; + } + + section_le = cpu_to_le64(section); + r = crypto_shash_update(desc, (__u8 *)§ion_le, sizeof(section_le)); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_update", r); + goto err; + } + } + + for (j = 0; j < ic->journal_section_entries; j++) { + struct journal_entry *je = access_journal_entry(ic, section, j); + + r = crypto_shash_update(desc, (__u8 *)&je->u.sector, sizeof(je->u.sector)); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_update", r); + goto err; + } + } + + size = crypto_shash_digestsize(ic->journal_mac); + + if (likely(size <= JOURNAL_MAC_SIZE)) { + r = crypto_shash_final(desc, result); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_final", r); + goto err; + } + memset(result + size, 0, JOURNAL_MAC_SIZE - size); + } else { + __u8 digest[HASH_MAX_DIGESTSIZE]; + + if (WARN_ON(size > sizeof(digest))) { + dm_integrity_io_error(ic, "digest_size", -EINVAL); + goto err; + } + r = crypto_shash_final(desc, digest); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_final", r); + goto err; + } + memcpy(result, digest, JOURNAL_MAC_SIZE); + } + + return; +err: + memset(result, 0, JOURNAL_MAC_SIZE); +} + +static void rw_section_mac(struct dm_integrity_c *ic, unsigned int section, bool wr) +{ + __u8 result[JOURNAL_MAC_SIZE]; + unsigned int j; + + if (!ic->journal_mac) + return; + + section_mac(ic, section, result); + + for (j = 0; j < JOURNAL_BLOCK_SECTORS; j++) { + struct journal_sector *js = access_journal(ic, section, j); + + if (likely(wr)) + memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR); + else { + if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR)) { + dm_integrity_io_error(ic, "journal mac", -EILSEQ); + dm_audit_log_target(DM_MSG_PREFIX, "mac-journal", ic->ti, 0); + } + } + } +} + +static void complete_journal_op(void *context) +{ + struct journal_completion *comp = context; + + BUG_ON(!atomic_read(&comp->in_flight)); + if (likely(atomic_dec_and_test(&comp->in_flight))) + complete(&comp->comp); +} + +static void xor_journal(struct dm_integrity_c *ic, bool encrypt, unsigned int section, + unsigned int n_sections, struct journal_completion *comp) +{ + struct async_submit_ctl submit; + size_t n_bytes = (size_t)(n_sections * ic->journal_section_sectors) << SECTOR_SHIFT; + unsigned int pl_index, pl_offset, section_index; + struct page_list *source_pl, *target_pl; + + if (likely(encrypt)) { + source_pl = ic->journal; + target_pl = ic->journal_io; + } else { + source_pl = ic->journal_io; + target_pl = ic->journal; + } + + page_list_location(ic, section, 0, &pl_index, &pl_offset); + + atomic_add(roundup(pl_offset + n_bytes, PAGE_SIZE) >> PAGE_SHIFT, &comp->in_flight); + + init_async_submit(&submit, ASYNC_TX_XOR_ZERO_DST, NULL, complete_journal_op, comp, NULL); + + section_index = pl_index; + + do { + size_t this_step; + struct page *src_pages[2]; + struct page *dst_page; + + while (unlikely(pl_index == section_index)) { + unsigned int dummy; + + if (likely(encrypt)) + rw_section_mac(ic, section, true); + section++; + n_sections--; + if (!n_sections) + break; + page_list_location(ic, section, 0, §ion_index, &dummy); + } + + this_step = min(n_bytes, (size_t)PAGE_SIZE - pl_offset); + dst_page = target_pl[pl_index].page; + src_pages[0] = source_pl[pl_index].page; + src_pages[1] = ic->journal_xor[pl_index].page; + + async_xor(dst_page, src_pages, pl_offset, 2, this_step, &submit); + + pl_index++; + pl_offset = 0; + n_bytes -= this_step; + } while (n_bytes); + + BUG_ON(n_sections); + + async_tx_issue_pending_all(); +} + +static void complete_journal_encrypt(void *data, int err) +{ + struct journal_completion *comp = data; + + if (unlikely(err)) { + if (likely(err == -EINPROGRESS)) { + complete(&comp->ic->crypto_backoff); + return; + } + dm_integrity_io_error(comp->ic, "asynchronous encrypt", err); + } + complete_journal_op(comp); +} + +static bool do_crypt(bool encrypt, struct skcipher_request *req, struct journal_completion *comp) +{ + int r; + + skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, + complete_journal_encrypt, comp); + if (likely(encrypt)) + r = crypto_skcipher_encrypt(req); + else + r = crypto_skcipher_decrypt(req); + if (likely(!r)) + return false; + if (likely(r == -EINPROGRESS)) + return true; + if (likely(r == -EBUSY)) { + wait_for_completion(&comp->ic->crypto_backoff); + reinit_completion(&comp->ic->crypto_backoff); + return true; + } + dm_integrity_io_error(comp->ic, "encrypt", r); + return false; +} + +static void crypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned int section, + unsigned int n_sections, struct journal_completion *comp) +{ + struct scatterlist **source_sg; + struct scatterlist **target_sg; + + atomic_add(2, &comp->in_flight); + + if (likely(encrypt)) { + source_sg = ic->journal_scatterlist; + target_sg = ic->journal_io_scatterlist; + } else { + source_sg = ic->journal_io_scatterlist; + target_sg = ic->journal_scatterlist; + } + + do { + struct skcipher_request *req; + unsigned int ivsize; + char *iv; + + if (likely(encrypt)) + rw_section_mac(ic, section, true); + + req = ic->sk_requests[section]; + ivsize = crypto_skcipher_ivsize(ic->journal_crypt); + iv = req->iv; + + memcpy(iv, iv + ivsize, ivsize); + + req->src = source_sg[section]; + req->dst = target_sg[section]; + + if (unlikely(do_crypt(encrypt, req, comp))) + atomic_inc(&comp->in_flight); + + section++; + n_sections--; + } while (n_sections); + + atomic_dec(&comp->in_flight); + complete_journal_op(comp); +} + +static void encrypt_journal(struct dm_integrity_c *ic, bool encrypt, unsigned int section, + unsigned int n_sections, struct journal_completion *comp) +{ + if (ic->journal_xor) + return xor_journal(ic, encrypt, section, n_sections, comp); + else + return crypt_journal(ic, encrypt, section, n_sections, comp); +} + +static void complete_journal_io(unsigned long error, void *context) +{ + struct journal_completion *comp = context; + + if (unlikely(error != 0)) + dm_integrity_io_error(comp->ic, "writing journal", -EIO); + complete_journal_op(comp); +} + +static void rw_journal_sectors(struct dm_integrity_c *ic, blk_opf_t opf, + unsigned int sector, unsigned int n_sectors, + struct journal_completion *comp) +{ + struct dm_io_request io_req; + struct dm_io_region io_loc; + unsigned int pl_index, pl_offset; + int r; + + if (unlikely(dm_integrity_failed(ic))) { + if (comp) + complete_journal_io(-1UL, comp); + return; + } + + pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT); + pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1); + + io_req.bi_opf = opf; + io_req.mem.type = DM_IO_PAGE_LIST; + if (ic->journal_io) + io_req.mem.ptr.pl = &ic->journal_io[pl_index]; + else + io_req.mem.ptr.pl = &ic->journal[pl_index]; + io_req.mem.offset = pl_offset; + if (likely(comp != NULL)) { + io_req.notify.fn = complete_journal_io; + io_req.notify.context = comp; + } else { + io_req.notify.fn = NULL; + } + io_req.client = ic->io; + io_loc.bdev = ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev; + io_loc.sector = ic->start + SB_SECTORS + sector; + io_loc.count = n_sectors; + + r = dm_io(&io_req, 1, &io_loc, NULL); + if (unlikely(r)) { + dm_integrity_io_error(ic, (opf & REQ_OP_MASK) == REQ_OP_READ ? + "reading journal" : "writing journal", r); + if (comp) { + WARN_ONCE(1, "asynchronous dm_io failed: %d", r); + complete_journal_io(-1UL, comp); + } + } +} + +static void rw_journal(struct dm_integrity_c *ic, blk_opf_t opf, + unsigned int section, unsigned int n_sections, + struct journal_completion *comp) +{ + unsigned int sector, n_sectors; + + sector = section * ic->journal_section_sectors; + n_sectors = n_sections * ic->journal_section_sectors; + + rw_journal_sectors(ic, opf, sector, n_sectors, comp); +} + +static void write_journal(struct dm_integrity_c *ic, unsigned int commit_start, unsigned int commit_sections) +{ + struct journal_completion io_comp; + struct journal_completion crypt_comp_1; + struct journal_completion crypt_comp_2; + unsigned int i; + + io_comp.ic = ic; + init_completion(&io_comp.comp); + + if (commit_start + commit_sections <= ic->journal_sections) { + io_comp.in_flight = (atomic_t)ATOMIC_INIT(1); + if (ic->journal_io) { + crypt_comp_1.ic = ic; + init_completion(&crypt_comp_1.comp); + crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0); + encrypt_journal(ic, true, commit_start, commit_sections, &crypt_comp_1); + wait_for_completion_io(&crypt_comp_1.comp); + } else { + for (i = 0; i < commit_sections; i++) + rw_section_mac(ic, commit_start + i, true); + } + rw_journal(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, commit_start, + commit_sections, &io_comp); + } else { + unsigned int to_end; + + io_comp.in_flight = (atomic_t)ATOMIC_INIT(2); + to_end = ic->journal_sections - commit_start; + if (ic->journal_io) { + crypt_comp_1.ic = ic; + init_completion(&crypt_comp_1.comp); + crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0); + encrypt_journal(ic, true, commit_start, to_end, &crypt_comp_1); + if (try_wait_for_completion(&crypt_comp_1.comp)) { + rw_journal(ic, REQ_OP_WRITE | REQ_FUA, + commit_start, to_end, &io_comp); + reinit_completion(&crypt_comp_1.comp); + crypt_comp_1.in_flight = (atomic_t)ATOMIC_INIT(0); + encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_1); + wait_for_completion_io(&crypt_comp_1.comp); + } else { + crypt_comp_2.ic = ic; + init_completion(&crypt_comp_2.comp); + crypt_comp_2.in_flight = (atomic_t)ATOMIC_INIT(0); + encrypt_journal(ic, true, 0, commit_sections - to_end, &crypt_comp_2); + wait_for_completion_io(&crypt_comp_1.comp); + rw_journal(ic, REQ_OP_WRITE | REQ_FUA, commit_start, to_end, &io_comp); + wait_for_completion_io(&crypt_comp_2.comp); + } + } else { + for (i = 0; i < to_end; i++) + rw_section_mac(ic, commit_start + i, true); + rw_journal(ic, REQ_OP_WRITE | REQ_FUA, commit_start, to_end, &io_comp); + for (i = 0; i < commit_sections - to_end; i++) + rw_section_mac(ic, i, true); + } + rw_journal(ic, REQ_OP_WRITE | REQ_FUA, 0, commit_sections - to_end, &io_comp); + } + + wait_for_completion_io(&io_comp.comp); +} + +static void copy_from_journal(struct dm_integrity_c *ic, unsigned int section, unsigned int offset, + unsigned int n_sectors, sector_t target, io_notify_fn fn, void *data) +{ + struct dm_io_request io_req; + struct dm_io_region io_loc; + int r; + unsigned int sector, pl_index, pl_offset; + + BUG_ON((target | n_sectors | offset) & (unsigned int)(ic->sectors_per_block - 1)); + + if (unlikely(dm_integrity_failed(ic))) { + fn(-1UL, data); + return; + } + + sector = section * ic->journal_section_sectors + JOURNAL_BLOCK_SECTORS + offset; + + pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT); + pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1); + + io_req.bi_opf = REQ_OP_WRITE; + io_req.mem.type = DM_IO_PAGE_LIST; + io_req.mem.ptr.pl = &ic->journal[pl_index]; + io_req.mem.offset = pl_offset; + io_req.notify.fn = fn; + io_req.notify.context = data; + io_req.client = ic->io; + io_loc.bdev = ic->dev->bdev; + io_loc.sector = target; + io_loc.count = n_sectors; + + r = dm_io(&io_req, 1, &io_loc, NULL); + if (unlikely(r)) { + WARN_ONCE(1, "asynchronous dm_io failed: %d", r); + fn(-1UL, data); + } +} + +static bool ranges_overlap(struct dm_integrity_range *range1, struct dm_integrity_range *range2) +{ + return range1->logical_sector < range2->logical_sector + range2->n_sectors && + range1->logical_sector + range1->n_sectors > range2->logical_sector; +} + +static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range, bool check_waiting) +{ + struct rb_node **n = &ic->in_progress.rb_node; + struct rb_node *parent; + + BUG_ON((new_range->logical_sector | new_range->n_sectors) & (unsigned int)(ic->sectors_per_block - 1)); + + if (likely(check_waiting)) { + struct dm_integrity_range *range; + + list_for_each_entry(range, &ic->wait_list, wait_entry) { + if (unlikely(ranges_overlap(range, new_range))) + return false; + } + } + + parent = NULL; + + while (*n) { + struct dm_integrity_range *range = container_of(*n, struct dm_integrity_range, node); + + parent = *n; + if (new_range->logical_sector + new_range->n_sectors <= range->logical_sector) + n = &range->node.rb_left; + else if (new_range->logical_sector >= range->logical_sector + range->n_sectors) + n = &range->node.rb_right; + else + return false; + } + + rb_link_node(&new_range->node, parent, n); + rb_insert_color(&new_range->node, &ic->in_progress); + + return true; +} + +static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity_range *range) +{ + rb_erase(&range->node, &ic->in_progress); + while (unlikely(!list_empty(&ic->wait_list))) { + struct dm_integrity_range *last_range = + list_first_entry(&ic->wait_list, struct dm_integrity_range, wait_entry); + struct task_struct *last_range_task; + + last_range_task = last_range->task; + list_del(&last_range->wait_entry); + if (!add_new_range(ic, last_range, false)) { + last_range->task = last_range_task; + list_add(&last_range->wait_entry, &ic->wait_list); + break; + } + last_range->waiting = false; + wake_up_process(last_range_task); + } +} + +static void remove_range(struct dm_integrity_c *ic, struct dm_integrity_range *range) +{ + unsigned long flags; + + spin_lock_irqsave(&ic->endio_wait.lock, flags); + remove_range_unlocked(ic, range); + spin_unlock_irqrestore(&ic->endio_wait.lock, flags); +} + +static void wait_and_add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range) +{ + new_range->waiting = true; + list_add_tail(&new_range->wait_entry, &ic->wait_list); + new_range->task = current; + do { + __set_current_state(TASK_UNINTERRUPTIBLE); + spin_unlock_irq(&ic->endio_wait.lock); + io_schedule(); + spin_lock_irq(&ic->endio_wait.lock); + } while (unlikely(new_range->waiting)); +} + +static void add_new_range_and_wait(struct dm_integrity_c *ic, struct dm_integrity_range *new_range) +{ + if (unlikely(!add_new_range(ic, new_range, true))) + wait_and_add_new_range(ic, new_range); +} + +static void init_journal_node(struct journal_node *node) +{ + RB_CLEAR_NODE(&node->node); + node->sector = (sector_t)-1; +} + +static void add_journal_node(struct dm_integrity_c *ic, struct journal_node *node, sector_t sector) +{ + struct rb_node **link; + struct rb_node *parent; + + node->sector = sector; + BUG_ON(!RB_EMPTY_NODE(&node->node)); + + link = &ic->journal_tree_root.rb_node; + parent = NULL; + + while (*link) { + struct journal_node *j; + + parent = *link; + j = container_of(parent, struct journal_node, node); + if (sector < j->sector) + link = &j->node.rb_left; + else + link = &j->node.rb_right; + } + + rb_link_node(&node->node, parent, link); + rb_insert_color(&node->node, &ic->journal_tree_root); +} + +static void remove_journal_node(struct dm_integrity_c *ic, struct journal_node *node) +{ + BUG_ON(RB_EMPTY_NODE(&node->node)); + rb_erase(&node->node, &ic->journal_tree_root); + init_journal_node(node); +} + +#define NOT_FOUND (-1U) + +static unsigned int find_journal_node(struct dm_integrity_c *ic, sector_t sector, sector_t *next_sector) +{ + struct rb_node *n = ic->journal_tree_root.rb_node; + unsigned int found = NOT_FOUND; + + *next_sector = (sector_t)-1; + while (n) { + struct journal_node *j = container_of(n, struct journal_node, node); + + if (sector == j->sector) + found = j - ic->journal_tree; + + if (sector < j->sector) { + *next_sector = j->sector; + n = j->node.rb_left; + } else + n = j->node.rb_right; + } + + return found; +} + +static bool test_journal_node(struct dm_integrity_c *ic, unsigned int pos, sector_t sector) +{ + struct journal_node *node, *next_node; + struct rb_node *next; + + if (unlikely(pos >= ic->journal_entries)) + return false; + node = &ic->journal_tree[pos]; + if (unlikely(RB_EMPTY_NODE(&node->node))) + return false; + if (unlikely(node->sector != sector)) + return false; + + next = rb_next(&node->node); + if (unlikely(!next)) + return true; + + next_node = container_of(next, struct journal_node, node); + return next_node->sector != sector; +} + +static bool find_newer_committed_node(struct dm_integrity_c *ic, struct journal_node *node) +{ + struct rb_node *next; + struct journal_node *next_node; + unsigned int next_section; + + BUG_ON(RB_EMPTY_NODE(&node->node)); + + next = rb_next(&node->node); + if (unlikely(!next)) + return false; + + next_node = container_of(next, struct journal_node, node); + + if (next_node->sector != node->sector) + return false; + + next_section = (unsigned int)(next_node - ic->journal_tree) / ic->journal_section_entries; + if (next_section >= ic->committed_section && + next_section < ic->committed_section + ic->n_committed_sections) + return true; + if (next_section + ic->journal_sections < ic->committed_section + ic->n_committed_sections) + return true; + + return false; +} + +#define TAG_READ 0 +#define TAG_WRITE 1 +#define TAG_CMP 2 + +static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, sector_t *metadata_block, + unsigned int *metadata_offset, unsigned int total_size, int op) +{ +#define MAY_BE_FILLER 1 +#define MAY_BE_HASH 2 + unsigned int hash_offset = 0; + unsigned int may_be = MAY_BE_HASH | (ic->discard ? MAY_BE_FILLER : 0); + + do { + unsigned char *data, *dp; + struct dm_buffer *b; + unsigned int to_copy; + int r; + + r = dm_integrity_failed(ic); + if (unlikely(r)) + return r; + + data = dm_bufio_read(ic->bufio, *metadata_block, &b); + if (IS_ERR(data)) + return PTR_ERR(data); + + to_copy = min((1U << SECTOR_SHIFT << ic->log2_buffer_sectors) - *metadata_offset, total_size); + dp = data + *metadata_offset; + if (op == TAG_READ) { + memcpy(tag, dp, to_copy); + } else if (op == TAG_WRITE) { + if (memcmp(dp, tag, to_copy)) { + memcpy(dp, tag, to_copy); + dm_bufio_mark_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy); + } + } else { + /* e.g.: op == TAG_CMP */ + + if (likely(is_power_of_2(ic->tag_size))) { + if (unlikely(memcmp(dp, tag, to_copy))) + if (unlikely(!ic->discard) || + unlikely(memchr_inv(dp, DISCARD_FILLER, to_copy) != NULL)) { + goto thorough_test; + } + } else { + unsigned int i, ts; +thorough_test: + ts = total_size; + + for (i = 0; i < to_copy; i++, ts--) { + if (unlikely(dp[i] != tag[i])) + may_be &= ~MAY_BE_HASH; + if (likely(dp[i] != DISCARD_FILLER)) + may_be &= ~MAY_BE_FILLER; + hash_offset++; + if (unlikely(hash_offset == ic->tag_size)) { + if (unlikely(!may_be)) { + dm_bufio_release(b); + return ts; + } + hash_offset = 0; + may_be = MAY_BE_HASH | (ic->discard ? MAY_BE_FILLER : 0); + } + } + } + } + dm_bufio_release(b); + + tag += to_copy; + *metadata_offset += to_copy; + if (unlikely(*metadata_offset == 1U << SECTOR_SHIFT << ic->log2_buffer_sectors)) { + (*metadata_block)++; + *metadata_offset = 0; + } + + if (unlikely(!is_power_of_2(ic->tag_size))) + hash_offset = (hash_offset + to_copy) % ic->tag_size; + + total_size -= to_copy; + } while (unlikely(total_size)); + + return 0; +#undef MAY_BE_FILLER +#undef MAY_BE_HASH +} + +struct flush_request { + struct dm_io_request io_req; + struct dm_io_region io_reg; + struct dm_integrity_c *ic; + struct completion comp; +}; + +static void flush_notify(unsigned long error, void *fr_) +{ + struct flush_request *fr = fr_; + + if (unlikely(error != 0)) + dm_integrity_io_error(fr->ic, "flushing disk cache", -EIO); + complete(&fr->comp); +} + +static void dm_integrity_flush_buffers(struct dm_integrity_c *ic, bool flush_data) +{ + int r; + struct flush_request fr; + + if (!ic->meta_dev) + flush_data = false; + if (flush_data) { + fr.io_req.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC, + fr.io_req.mem.type = DM_IO_KMEM, + fr.io_req.mem.ptr.addr = NULL, + fr.io_req.notify.fn = flush_notify, + fr.io_req.notify.context = &fr; + fr.io_req.client = dm_bufio_get_dm_io_client(ic->bufio), + fr.io_reg.bdev = ic->dev->bdev, + fr.io_reg.sector = 0, + fr.io_reg.count = 0, + fr.ic = ic; + init_completion(&fr.comp); + r = dm_io(&fr.io_req, 1, &fr.io_reg, NULL); + BUG_ON(r); + } + + r = dm_bufio_write_dirty_buffers(ic->bufio); + if (unlikely(r)) + dm_integrity_io_error(ic, "writing tags", r); + + if (flush_data) + wait_for_completion(&fr.comp); +} + +static void sleep_on_endio_wait(struct dm_integrity_c *ic) +{ + DECLARE_WAITQUEUE(wait, current); + + __add_wait_queue(&ic->endio_wait, &wait); + __set_current_state(TASK_UNINTERRUPTIBLE); + spin_unlock_irq(&ic->endio_wait.lock); + io_schedule(); + spin_lock_irq(&ic->endio_wait.lock); + __remove_wait_queue(&ic->endio_wait, &wait); +} + +static void autocommit_fn(struct timer_list *t) +{ + struct dm_integrity_c *ic = from_timer(ic, t, autocommit_timer); + + if (likely(!dm_integrity_failed(ic))) + queue_work(ic->commit_wq, &ic->commit_work); +} + +static void schedule_autocommit(struct dm_integrity_c *ic) +{ + if (!timer_pending(&ic->autocommit_timer)) + mod_timer(&ic->autocommit_timer, jiffies + ic->autocommit_jiffies); +} + +static void submit_flush_bio(struct dm_integrity_c *ic, struct dm_integrity_io *dio) +{ + struct bio *bio; + unsigned long flags; + + spin_lock_irqsave(&ic->endio_wait.lock, flags); + bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); + bio_list_add(&ic->flush_bio_list, bio); + spin_unlock_irqrestore(&ic->endio_wait.lock, flags); + + queue_work(ic->commit_wq, &ic->commit_work); +} + +static void do_endio(struct dm_integrity_c *ic, struct bio *bio) +{ + int r; + + r = dm_integrity_failed(ic); + if (unlikely(r) && !bio->bi_status) + bio->bi_status = errno_to_blk_status(r); + if (unlikely(ic->synchronous_mode) && bio_op(bio) == REQ_OP_WRITE) { + unsigned long flags; + + spin_lock_irqsave(&ic->endio_wait.lock, flags); + bio_list_add(&ic->synchronous_bios, bio); + queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0); + spin_unlock_irqrestore(&ic->endio_wait.lock, flags); + return; + } + bio_endio(bio); +} + +static void do_endio_flush(struct dm_integrity_c *ic, struct dm_integrity_io *dio) +{ + struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); + + if (unlikely(dio->fua) && likely(!bio->bi_status) && likely(!dm_integrity_failed(ic))) + submit_flush_bio(ic, dio); + else + do_endio(ic, bio); +} + +static void dec_in_flight(struct dm_integrity_io *dio) +{ + if (atomic_dec_and_test(&dio->in_flight)) { + struct dm_integrity_c *ic = dio->ic; + struct bio *bio; + + remove_range(ic, &dio->range); + + if (dio->op == REQ_OP_WRITE || unlikely(dio->op == REQ_OP_DISCARD)) + schedule_autocommit(ic); + + bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); + if (unlikely(dio->bi_status) && !bio->bi_status) + bio->bi_status = dio->bi_status; + if (likely(!bio->bi_status) && unlikely(bio_sectors(bio) != dio->range.n_sectors)) { + dio->range.logical_sector += dio->range.n_sectors; + bio_advance(bio, dio->range.n_sectors << SECTOR_SHIFT); + INIT_WORK(&dio->work, integrity_bio_wait); + queue_work(ic->offload_wq, &dio->work); + return; + } + do_endio_flush(ic, dio); + } +} + +static void integrity_end_io(struct bio *bio) +{ + struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io)); + + dm_bio_restore(&dio->bio_details, bio); + if (bio->bi_integrity) + bio->bi_opf |= REQ_INTEGRITY; + + if (dio->completion) + complete(dio->completion); + + dec_in_flight(dio); +} + +static void integrity_sector_checksum(struct dm_integrity_c *ic, sector_t sector, + const char *data, char *result) +{ + __le64 sector_le = cpu_to_le64(sector); + SHASH_DESC_ON_STACK(req, ic->internal_hash); + int r; + unsigned int digest_size; + + req->tfm = ic->internal_hash; + + r = crypto_shash_init(req); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_init", r); + goto failed; + } + + if (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) { + r = crypto_shash_update(req, (__u8 *)&ic->sb->salt, SALT_SIZE); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_update", r); + goto failed; + } + } + + r = crypto_shash_update(req, (const __u8 *)§or_le, sizeof(sector_le)); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_update", r); + goto failed; + } + + r = crypto_shash_update(req, data, ic->sectors_per_block << SECTOR_SHIFT); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_update", r); + goto failed; + } + + r = crypto_shash_final(req, result); + if (unlikely(r < 0)) { + dm_integrity_io_error(ic, "crypto_shash_final", r); + goto failed; + } + + digest_size = crypto_shash_digestsize(ic->internal_hash); + if (unlikely(digest_size < ic->tag_size)) + memset(result + digest_size, 0, ic->tag_size - digest_size); + + return; + +failed: + /* this shouldn't happen anyway, the hash functions have no reason to fail */ + get_random_bytes(result, ic->tag_size); +} + +static void integrity_metadata(struct work_struct *w) +{ + struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work); + struct dm_integrity_c *ic = dio->ic; + + int r; + + if (ic->internal_hash) { + struct bvec_iter iter; + struct bio_vec bv; + unsigned int digest_size = crypto_shash_digestsize(ic->internal_hash); + struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); + char *checksums; + unsigned int extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0; + char checksums_onstack[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; + sector_t sector; + unsigned int sectors_to_process; + + if (unlikely(ic->mode == 'R')) + goto skip_io; + + if (likely(dio->op != REQ_OP_DISCARD)) + checksums = kmalloc((PAGE_SIZE >> SECTOR_SHIFT >> ic->sb->log2_sectors_per_block) * ic->tag_size + extra_space, + GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN); + else + checksums = kmalloc(PAGE_SIZE, GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN); + if (!checksums) { + checksums = checksums_onstack; + if (WARN_ON(extra_space && + digest_size > sizeof(checksums_onstack))) { + r = -EINVAL; + goto error; + } + } + + if (unlikely(dio->op == REQ_OP_DISCARD)) { + unsigned int bi_size = dio->bio_details.bi_iter.bi_size; + unsigned int max_size = likely(checksums != checksums_onstack) ? PAGE_SIZE : HASH_MAX_DIGESTSIZE; + unsigned int max_blocks = max_size / ic->tag_size; + + memset(checksums, DISCARD_FILLER, max_size); + + while (bi_size) { + unsigned int this_step_blocks = bi_size >> (SECTOR_SHIFT + ic->sb->log2_sectors_per_block); + + this_step_blocks = min(this_step_blocks, max_blocks); + r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset, + this_step_blocks * ic->tag_size, TAG_WRITE); + if (unlikely(r)) { + if (likely(checksums != checksums_onstack)) + kfree(checksums); + goto error; + } + + bi_size -= this_step_blocks << (SECTOR_SHIFT + ic->sb->log2_sectors_per_block); + } + + if (likely(checksums != checksums_onstack)) + kfree(checksums); + goto skip_io; + } + + sector = dio->range.logical_sector; + sectors_to_process = dio->range.n_sectors; + + __bio_for_each_segment(bv, bio, iter, dio->bio_details.bi_iter) { + struct bio_vec bv_copy = bv; + unsigned int pos; + char *mem, *checksums_ptr; + +again: + mem = bvec_kmap_local(&bv_copy); + pos = 0; + checksums_ptr = checksums; + do { + integrity_sector_checksum(ic, sector, mem + pos, checksums_ptr); + checksums_ptr += ic->tag_size; + sectors_to_process -= ic->sectors_per_block; + pos += ic->sectors_per_block << SECTOR_SHIFT; + sector += ic->sectors_per_block; + } while (pos < bv_copy.bv_len && sectors_to_process && checksums != checksums_onstack); + kunmap_local(mem); + + r = dm_integrity_rw_tag(ic, checksums, &dio->metadata_block, &dio->metadata_offset, + checksums_ptr - checksums, dio->op == REQ_OP_READ ? TAG_CMP : TAG_WRITE); + if (unlikely(r)) { + if (r > 0) { + sector_t s; + + s = sector - ((r + ic->tag_size - 1) / ic->tag_size); + DMERR_LIMIT("%pg: Checksum failed at sector 0x%llx", + bio->bi_bdev, s); + r = -EILSEQ; + atomic64_inc(&ic->number_of_mismatches); + dm_audit_log_bio(DM_MSG_PREFIX, "integrity-checksum", + bio, s, 0); + } + if (likely(checksums != checksums_onstack)) + kfree(checksums); + goto error; + } + + if (!sectors_to_process) + break; + + if (unlikely(pos < bv_copy.bv_len)) { + bv_copy.bv_offset += pos; + bv_copy.bv_len -= pos; + goto again; + } + } + + if (likely(checksums != checksums_onstack)) + kfree(checksums); + } else { + struct bio_integrity_payload *bip = dio->bio_details.bi_integrity; + + if (bip) { + struct bio_vec biv; + struct bvec_iter iter; + unsigned int data_to_process = dio->range.n_sectors; + + sector_to_block(ic, data_to_process); + data_to_process *= ic->tag_size; + + bip_for_each_vec(biv, bip, iter) { + unsigned char *tag; + unsigned int this_len; + + BUG_ON(PageHighMem(biv.bv_page)); + tag = bvec_virt(&biv); + this_len = min(biv.bv_len, data_to_process); + r = dm_integrity_rw_tag(ic, tag, &dio->metadata_block, &dio->metadata_offset, + this_len, dio->op == REQ_OP_READ ? TAG_READ : TAG_WRITE); + if (unlikely(r)) + goto error; + data_to_process -= this_len; + if (!data_to_process) + break; + } + } + } +skip_io: + dec_in_flight(dio); + return; +error: + dio->bi_status = errno_to_blk_status(r); + dec_in_flight(dio); +} + +static int dm_integrity_map(struct dm_target *ti, struct bio *bio) +{ + struct dm_integrity_c *ic = ti->private; + struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io)); + struct bio_integrity_payload *bip; + + sector_t area, offset; + + dio->ic = ic; + dio->bi_status = 0; + dio->op = bio_op(bio); + + if (unlikely(dio->op == REQ_OP_DISCARD)) { + if (ti->max_io_len) { + sector_t sec = dm_target_offset(ti, bio->bi_iter.bi_sector); + unsigned int log2_max_io_len = __fls(ti->max_io_len); + sector_t start_boundary = sec >> log2_max_io_len; + sector_t end_boundary = (sec + bio_sectors(bio) - 1) >> log2_max_io_len; + + if (start_boundary < end_boundary) { + sector_t len = ti->max_io_len - (sec & (ti->max_io_len - 1)); + + dm_accept_partial_bio(bio, len); + } + } + } + + if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { + submit_flush_bio(ic, dio); + return DM_MAPIO_SUBMITTED; + } + + dio->range.logical_sector = dm_target_offset(ti, bio->bi_iter.bi_sector); + dio->fua = dio->op == REQ_OP_WRITE && bio->bi_opf & REQ_FUA; + if (unlikely(dio->fua)) { + /* + * Don't pass down the FUA flag because we have to flush + * disk cache anyway. + */ + bio->bi_opf &= ~REQ_FUA; + } + if (unlikely(dio->range.logical_sector + bio_sectors(bio) > ic->provided_data_sectors)) { + DMERR("Too big sector number: 0x%llx + 0x%x > 0x%llx", + dio->range.logical_sector, bio_sectors(bio), + ic->provided_data_sectors); + return DM_MAPIO_KILL; + } + if (unlikely((dio->range.logical_sector | bio_sectors(bio)) & (unsigned int)(ic->sectors_per_block - 1))) { + DMERR("Bio not aligned on %u sectors: 0x%llx, 0x%x", + ic->sectors_per_block, + dio->range.logical_sector, bio_sectors(bio)); + return DM_MAPIO_KILL; + } + + if (ic->sectors_per_block > 1 && likely(dio->op != REQ_OP_DISCARD)) { + struct bvec_iter iter; + struct bio_vec bv; + + bio_for_each_segment(bv, bio, iter) { + if (unlikely(bv.bv_len & ((ic->sectors_per_block << SECTOR_SHIFT) - 1))) { + DMERR("Bio vector (%u,%u) is not aligned on %u-sector boundary", + bv.bv_offset, bv.bv_len, ic->sectors_per_block); + return DM_MAPIO_KILL; + } + } + } + + bip = bio_integrity(bio); + if (!ic->internal_hash) { + if (bip) { + unsigned int wanted_tag_size = bio_sectors(bio) >> ic->sb->log2_sectors_per_block; + + if (ic->log2_tag_size >= 0) + wanted_tag_size <<= ic->log2_tag_size; + else + wanted_tag_size *= ic->tag_size; + if (unlikely(wanted_tag_size != bip->bip_iter.bi_size)) { + DMERR("Invalid integrity data size %u, expected %u", + bip->bip_iter.bi_size, wanted_tag_size); + return DM_MAPIO_KILL; + } + } + } else { + if (unlikely(bip != NULL)) { + DMERR("Unexpected integrity data when using internal hash"); + return DM_MAPIO_KILL; + } + } + + if (unlikely(ic->mode == 'R') && unlikely(dio->op != REQ_OP_READ)) + return DM_MAPIO_KILL; + + get_area_and_offset(ic, dio->range.logical_sector, &area, &offset); + dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset); + bio->bi_iter.bi_sector = get_data_sector(ic, area, offset); + + dm_integrity_map_continue(dio, true); + return DM_MAPIO_SUBMITTED; +} + +static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio, + unsigned int journal_section, unsigned int journal_entry) +{ + struct dm_integrity_c *ic = dio->ic; + sector_t logical_sector; + unsigned int n_sectors; + + logical_sector = dio->range.logical_sector; + n_sectors = dio->range.n_sectors; + do { + struct bio_vec bv = bio_iovec(bio); + char *mem; + + if (unlikely(bv.bv_len >> SECTOR_SHIFT > n_sectors)) + bv.bv_len = n_sectors << SECTOR_SHIFT; + n_sectors -= bv.bv_len >> SECTOR_SHIFT; + bio_advance_iter(bio, &bio->bi_iter, bv.bv_len); +retry_kmap: + mem = kmap_local_page(bv.bv_page); + if (likely(dio->op == REQ_OP_WRITE)) + flush_dcache_page(bv.bv_page); + + do { + struct journal_entry *je = access_journal_entry(ic, journal_section, journal_entry); + + if (unlikely(dio->op == REQ_OP_READ)) { + struct journal_sector *js; + char *mem_ptr; + unsigned int s; + + if (unlikely(journal_entry_is_inprogress(je))) { + flush_dcache_page(bv.bv_page); + kunmap_local(mem); + + __io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je)); + goto retry_kmap; + } + smp_rmb(); + BUG_ON(journal_entry_get_sector(je) != logical_sector); + js = access_journal_data(ic, journal_section, journal_entry); + mem_ptr = mem + bv.bv_offset; + s = 0; + do { + memcpy(mem_ptr, js, JOURNAL_SECTOR_DATA); + *(commit_id_t *)(mem_ptr + JOURNAL_SECTOR_DATA) = je->last_bytes[s]; + js++; + mem_ptr += 1 << SECTOR_SHIFT; + } while (++s < ic->sectors_per_block); +#ifdef INTERNAL_VERIFY + if (ic->internal_hash) { + char checksums_onstack[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; + + integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack); + if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) { + DMERR_LIMIT("Checksum failed when reading from journal, at sector 0x%llx", + logical_sector); + dm_audit_log_bio(DM_MSG_PREFIX, "journal-checksum", + bio, logical_sector, 0); + } + } +#endif + } + + if (!ic->internal_hash) { + struct bio_integrity_payload *bip = bio_integrity(bio); + unsigned int tag_todo = ic->tag_size; + char *tag_ptr = journal_entry_tag(ic, je); + + if (bip) { + do { + struct bio_vec biv = bvec_iter_bvec(bip->bip_vec, bip->bip_iter); + unsigned int tag_now = min(biv.bv_len, tag_todo); + char *tag_addr; + + BUG_ON(PageHighMem(biv.bv_page)); + tag_addr = bvec_virt(&biv); + if (likely(dio->op == REQ_OP_WRITE)) + memcpy(tag_ptr, tag_addr, tag_now); + else + memcpy(tag_addr, tag_ptr, tag_now); + bvec_iter_advance(bip->bip_vec, &bip->bip_iter, tag_now); + tag_ptr += tag_now; + tag_todo -= tag_now; + } while (unlikely(tag_todo)); + } else if (likely(dio->op == REQ_OP_WRITE)) + memset(tag_ptr, 0, tag_todo); + } + + if (likely(dio->op == REQ_OP_WRITE)) { + struct journal_sector *js; + unsigned int s; + + js = access_journal_data(ic, journal_section, journal_entry); + memcpy(js, mem + bv.bv_offset, ic->sectors_per_block << SECTOR_SHIFT); + + s = 0; + do { + je->last_bytes[s] = js[s].commit_id; + } while (++s < ic->sectors_per_block); + + if (ic->internal_hash) { + unsigned int digest_size = crypto_shash_digestsize(ic->internal_hash); + + if (unlikely(digest_size > ic->tag_size)) { + char checksums_onstack[HASH_MAX_DIGESTSIZE]; + + integrity_sector_checksum(ic, logical_sector, (char *)js, checksums_onstack); + memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size); + } else + integrity_sector_checksum(ic, logical_sector, (char *)js, journal_entry_tag(ic, je)); + } + + journal_entry_set_sector(je, logical_sector); + } + logical_sector += ic->sectors_per_block; + + journal_entry++; + if (unlikely(journal_entry == ic->journal_section_entries)) { + journal_entry = 0; + journal_section++; + wraparound_section(ic, &journal_section); + } + + bv.bv_offset += ic->sectors_per_block << SECTOR_SHIFT; + } while (bv.bv_len -= ic->sectors_per_block << SECTOR_SHIFT); + + if (unlikely(dio->op == REQ_OP_READ)) + flush_dcache_page(bv.bv_page); + kunmap_local(mem); + } while (n_sectors); + + if (likely(dio->op == REQ_OP_WRITE)) { + smp_mb(); + if (unlikely(waitqueue_active(&ic->copy_to_journal_wait))) + wake_up(&ic->copy_to_journal_wait); + if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) + queue_work(ic->commit_wq, &ic->commit_work); + else + schedule_autocommit(ic); + } else + remove_range(ic, &dio->range); + + if (unlikely(bio->bi_iter.bi_size)) { + sector_t area, offset; + + dio->range.logical_sector = logical_sector; + get_area_and_offset(ic, dio->range.logical_sector, &area, &offset); + dio->metadata_block = get_metadata_sector_and_offset(ic, area, offset, &dio->metadata_offset); + return true; + } + + return false; +} + +static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map) +{ + struct dm_integrity_c *ic = dio->ic; + struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); + unsigned int journal_section, journal_entry; + unsigned int journal_read_pos; + struct completion read_comp; + bool discard_retried = false; + bool need_sync_io = ic->internal_hash && dio->op == REQ_OP_READ; + + if (unlikely(dio->op == REQ_OP_DISCARD) && ic->mode != 'D') + need_sync_io = true; + + if (need_sync_io && from_map) { + INIT_WORK(&dio->work, integrity_bio_wait); + queue_work(ic->offload_wq, &dio->work); + return; + } + +lock_retry: + spin_lock_irq(&ic->endio_wait.lock); +retry: + if (unlikely(dm_integrity_failed(ic))) { + spin_unlock_irq(&ic->endio_wait.lock); + do_endio(ic, bio); + return; + } + dio->range.n_sectors = bio_sectors(bio); + journal_read_pos = NOT_FOUND; + if (ic->mode == 'J' && likely(dio->op != REQ_OP_DISCARD)) { + if (dio->op == REQ_OP_WRITE) { + unsigned int next_entry, i, pos; + unsigned int ws, we, range_sectors; + + dio->range.n_sectors = min(dio->range.n_sectors, + (sector_t)ic->free_sectors << ic->sb->log2_sectors_per_block); + if (unlikely(!dio->range.n_sectors)) { + if (from_map) + goto offload_to_thread; + sleep_on_endio_wait(ic); + goto retry; + } + range_sectors = dio->range.n_sectors >> ic->sb->log2_sectors_per_block; + ic->free_sectors -= range_sectors; + journal_section = ic->free_section; + journal_entry = ic->free_section_entry; + + next_entry = ic->free_section_entry + range_sectors; + ic->free_section_entry = next_entry % ic->journal_section_entries; + ic->free_section += next_entry / ic->journal_section_entries; + ic->n_uncommitted_sections += next_entry / ic->journal_section_entries; + wraparound_section(ic, &ic->free_section); + + pos = journal_section * ic->journal_section_entries + journal_entry; + ws = journal_section; + we = journal_entry; + i = 0; + do { + struct journal_entry *je; + + add_journal_node(ic, &ic->journal_tree[pos], dio->range.logical_sector + i); + pos++; + if (unlikely(pos >= ic->journal_entries)) + pos = 0; + + je = access_journal_entry(ic, ws, we); + BUG_ON(!journal_entry_is_unused(je)); + journal_entry_set_inprogress(je); + we++; + if (unlikely(we == ic->journal_section_entries)) { + we = 0; + ws++; + wraparound_section(ic, &ws); + } + } while ((i += ic->sectors_per_block) < dio->range.n_sectors); + + spin_unlock_irq(&ic->endio_wait.lock); + goto journal_read_write; + } else { + sector_t next_sector; + + journal_read_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector); + if (likely(journal_read_pos == NOT_FOUND)) { + if (unlikely(dio->range.n_sectors > next_sector - dio->range.logical_sector)) + dio->range.n_sectors = next_sector - dio->range.logical_sector; + } else { + unsigned int i; + unsigned int jp = journal_read_pos + 1; + + for (i = ic->sectors_per_block; i < dio->range.n_sectors; i += ic->sectors_per_block, jp++) { + if (!test_journal_node(ic, jp, dio->range.logical_sector + i)) + break; + } + dio->range.n_sectors = i; + } + } + } + if (unlikely(!add_new_range(ic, &dio->range, true))) { + /* + * We must not sleep in the request routine because it could + * stall bios on current->bio_list. + * So, we offload the bio to a workqueue if we have to sleep. + */ + if (from_map) { +offload_to_thread: + spin_unlock_irq(&ic->endio_wait.lock); + INIT_WORK(&dio->work, integrity_bio_wait); + queue_work(ic->wait_wq, &dio->work); + return; + } + if (journal_read_pos != NOT_FOUND) + dio->range.n_sectors = ic->sectors_per_block; + wait_and_add_new_range(ic, &dio->range); + /* + * wait_and_add_new_range drops the spinlock, so the journal + * may have been changed arbitrarily. We need to recheck. + * To simplify the code, we restrict I/O size to just one block. + */ + if (journal_read_pos != NOT_FOUND) { + sector_t next_sector; + unsigned int new_pos; + + new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector); + if (unlikely(new_pos != journal_read_pos)) { + remove_range_unlocked(ic, &dio->range); + goto retry; + } + } + } + if (ic->mode == 'J' && likely(dio->op == REQ_OP_DISCARD) && !discard_retried) { + sector_t next_sector; + unsigned int new_pos; + + new_pos = find_journal_node(ic, dio->range.logical_sector, &next_sector); + if (unlikely(new_pos != NOT_FOUND) || + unlikely(next_sector < dio->range.logical_sector - dio->range.n_sectors)) { + remove_range_unlocked(ic, &dio->range); + spin_unlock_irq(&ic->endio_wait.lock); + queue_work(ic->commit_wq, &ic->commit_work); + flush_workqueue(ic->commit_wq); + queue_work(ic->writer_wq, &ic->writer_work); + flush_workqueue(ic->writer_wq); + discard_retried = true; + goto lock_retry; + } + } + spin_unlock_irq(&ic->endio_wait.lock); + + if (unlikely(journal_read_pos != NOT_FOUND)) { + journal_section = journal_read_pos / ic->journal_section_entries; + journal_entry = journal_read_pos % ic->journal_section_entries; + goto journal_read_write; + } + + if (ic->mode == 'B' && (dio->op == REQ_OP_WRITE || unlikely(dio->op == REQ_OP_DISCARD))) { + if (!block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector, + dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) { + struct bitmap_block_status *bbs; + + bbs = sector_to_bitmap_block(ic, dio->range.logical_sector); + spin_lock(&bbs->bio_queue_lock); + bio_list_add(&bbs->bio_queue, bio); + spin_unlock(&bbs->bio_queue_lock); + queue_work(ic->writer_wq, &bbs->work); + return; + } + } + + dio->in_flight = (atomic_t)ATOMIC_INIT(2); + + if (need_sync_io) { + init_completion(&read_comp); + dio->completion = &read_comp; + } else + dio->completion = NULL; + + dm_bio_record(&dio->bio_details, bio); + bio_set_dev(bio, ic->dev->bdev); + bio->bi_integrity = NULL; + bio->bi_opf &= ~REQ_INTEGRITY; + bio->bi_end_io = integrity_end_io; + bio->bi_iter.bi_size = dio->range.n_sectors << SECTOR_SHIFT; + + if (unlikely(dio->op == REQ_OP_DISCARD) && likely(ic->mode != 'D')) { + integrity_metadata(&dio->work); + dm_integrity_flush_buffers(ic, false); + + dio->in_flight = (atomic_t)ATOMIC_INIT(1); + dio->completion = NULL; + + submit_bio_noacct(bio); + + return; + } + + submit_bio_noacct(bio); + + if (need_sync_io) { + wait_for_completion_io(&read_comp); + if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) && + dio->range.logical_sector + dio->range.n_sectors > le64_to_cpu(ic->sb->recalc_sector)) + goto skip_check; + if (ic->mode == 'B') { + if (!block_bitmap_op(ic, ic->recalc_bitmap, dio->range.logical_sector, + dio->range.n_sectors, BITMAP_OP_TEST_ALL_CLEAR)) + goto skip_check; + } + + if (likely(!bio->bi_status)) + integrity_metadata(&dio->work); + else +skip_check: + dec_in_flight(dio); + } else { + INIT_WORK(&dio->work, integrity_metadata); + queue_work(ic->metadata_wq, &dio->work); + } + + return; + +journal_read_write: + if (unlikely(__journal_read_write(dio, bio, journal_section, journal_entry))) + goto lock_retry; + + do_endio_flush(ic, dio); +} + + +static void integrity_bio_wait(struct work_struct *w) +{ + struct dm_integrity_io *dio = container_of(w, struct dm_integrity_io, work); + + dm_integrity_map_continue(dio, false); +} + +static void pad_uncommitted(struct dm_integrity_c *ic) +{ + if (ic->free_section_entry) { + ic->free_sectors -= ic->journal_section_entries - ic->free_section_entry; + ic->free_section_entry = 0; + ic->free_section++; + wraparound_section(ic, &ic->free_section); + ic->n_uncommitted_sections++; + } + if (WARN_ON(ic->journal_sections * ic->journal_section_entries != + (ic->n_uncommitted_sections + ic->n_committed_sections) * + ic->journal_section_entries + ic->free_sectors)) { + DMCRIT("journal_sections %u, journal_section_entries %u, " + "n_uncommitted_sections %u, n_committed_sections %u, " + "journal_section_entries %u, free_sectors %u", + ic->journal_sections, ic->journal_section_entries, + ic->n_uncommitted_sections, ic->n_committed_sections, + ic->journal_section_entries, ic->free_sectors); + } +} + +static void integrity_commit(struct work_struct *w) +{ + struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, commit_work); + unsigned int commit_start, commit_sections; + unsigned int i, j, n; + struct bio *flushes; + + del_timer(&ic->autocommit_timer); + + spin_lock_irq(&ic->endio_wait.lock); + flushes = bio_list_get(&ic->flush_bio_list); + if (unlikely(ic->mode != 'J')) { + spin_unlock_irq(&ic->endio_wait.lock); + dm_integrity_flush_buffers(ic, true); + goto release_flush_bios; + } + + pad_uncommitted(ic); + commit_start = ic->uncommitted_section; + commit_sections = ic->n_uncommitted_sections; + spin_unlock_irq(&ic->endio_wait.lock); + + if (!commit_sections) + goto release_flush_bios; + + ic->wrote_to_journal = true; + + i = commit_start; + for (n = 0; n < commit_sections; n++) { + for (j = 0; j < ic->journal_section_entries; j++) { + struct journal_entry *je; + + je = access_journal_entry(ic, i, j); + io_wait_event(ic->copy_to_journal_wait, !journal_entry_is_inprogress(je)); + } + for (j = 0; j < ic->journal_section_sectors; j++) { + struct journal_sector *js; + + js = access_journal(ic, i, j); + js->commit_id = dm_integrity_commit_id(ic, i, j, ic->commit_seq); + } + i++; + if (unlikely(i >= ic->journal_sections)) + ic->commit_seq = next_commit_seq(ic->commit_seq); + wraparound_section(ic, &i); + } + smp_rmb(); + + write_journal(ic, commit_start, commit_sections); + + spin_lock_irq(&ic->endio_wait.lock); + ic->uncommitted_section += commit_sections; + wraparound_section(ic, &ic->uncommitted_section); + ic->n_uncommitted_sections -= commit_sections; + ic->n_committed_sections += commit_sections; + spin_unlock_irq(&ic->endio_wait.lock); + + if (READ_ONCE(ic->free_sectors) <= ic->free_sectors_threshold) + queue_work(ic->writer_wq, &ic->writer_work); + +release_flush_bios: + while (flushes) { + struct bio *next = flushes->bi_next; + + flushes->bi_next = NULL; + do_endio(ic, flushes); + flushes = next; + } +} + +static void complete_copy_from_journal(unsigned long error, void *context) +{ + struct journal_io *io = context; + struct journal_completion *comp = io->comp; + struct dm_integrity_c *ic = comp->ic; + + remove_range(ic, &io->range); + mempool_free(io, &ic->journal_io_mempool); + if (unlikely(error != 0)) + dm_integrity_io_error(ic, "copying from journal", -EIO); + complete_journal_op(comp); +} + +static void restore_last_bytes(struct dm_integrity_c *ic, struct journal_sector *js, + struct journal_entry *je) +{ + unsigned int s = 0; + + do { + js->commit_id = je->last_bytes[s]; + js++; + } while (++s < ic->sectors_per_block); +} + +static void do_journal_write(struct dm_integrity_c *ic, unsigned int write_start, + unsigned int write_sections, bool from_replay) +{ + unsigned int i, j, n; + struct journal_completion comp; + struct blk_plug plug; + + blk_start_plug(&plug); + + comp.ic = ic; + comp.in_flight = (atomic_t)ATOMIC_INIT(1); + init_completion(&comp.comp); + + i = write_start; + for (n = 0; n < write_sections; n++, i++, wraparound_section(ic, &i)) { +#ifndef INTERNAL_VERIFY + if (unlikely(from_replay)) +#endif + rw_section_mac(ic, i, false); + for (j = 0; j < ic->journal_section_entries; j++) { + struct journal_entry *je = access_journal_entry(ic, i, j); + sector_t sec, area, offset; + unsigned int k, l, next_loop; + sector_t metadata_block; + unsigned int metadata_offset; + struct journal_io *io; + + if (journal_entry_is_unused(je)) + continue; + BUG_ON(unlikely(journal_entry_is_inprogress(je)) && !from_replay); + sec = journal_entry_get_sector(je); + if (unlikely(from_replay)) { + if (unlikely(sec & (unsigned int)(ic->sectors_per_block - 1))) { + dm_integrity_io_error(ic, "invalid sector in journal", -EIO); + sec &= ~(sector_t)(ic->sectors_per_block - 1); + } + if (unlikely(sec >= ic->provided_data_sectors)) { + journal_entry_set_unused(je); + continue; + } + } + get_area_and_offset(ic, sec, &area, &offset); + restore_last_bytes(ic, access_journal_data(ic, i, j), je); + for (k = j + 1; k < ic->journal_section_entries; k++) { + struct journal_entry *je2 = access_journal_entry(ic, i, k); + sector_t sec2, area2, offset2; + + if (journal_entry_is_unused(je2)) + break; + BUG_ON(unlikely(journal_entry_is_inprogress(je2)) && !from_replay); + sec2 = journal_entry_get_sector(je2); + if (unlikely(sec2 >= ic->provided_data_sectors)) + break; + get_area_and_offset(ic, sec2, &area2, &offset2); + if (area2 != area || offset2 != offset + ((k - j) << ic->sb->log2_sectors_per_block)) + break; + restore_last_bytes(ic, access_journal_data(ic, i, k), je2); + } + next_loop = k - 1; + + io = mempool_alloc(&ic->journal_io_mempool, GFP_NOIO); + io->comp = ∁ + io->range.logical_sector = sec; + io->range.n_sectors = (k - j) << ic->sb->log2_sectors_per_block; + + spin_lock_irq(&ic->endio_wait.lock); + add_new_range_and_wait(ic, &io->range); + + if (likely(!from_replay)) { + struct journal_node *section_node = &ic->journal_tree[i * ic->journal_section_entries]; + + /* don't write if there is newer committed sector */ + while (j < k && find_newer_committed_node(ic, §ion_node[j])) { + struct journal_entry *je2 = access_journal_entry(ic, i, j); + + journal_entry_set_unused(je2); + remove_journal_node(ic, §ion_node[j]); + j++; + sec += ic->sectors_per_block; + offset += ic->sectors_per_block; + } + while (j < k && find_newer_committed_node(ic, §ion_node[k - 1])) { + struct journal_entry *je2 = access_journal_entry(ic, i, k - 1); + + journal_entry_set_unused(je2); + remove_journal_node(ic, §ion_node[k - 1]); + k--; + } + if (j == k) { + remove_range_unlocked(ic, &io->range); + spin_unlock_irq(&ic->endio_wait.lock); + mempool_free(io, &ic->journal_io_mempool); + goto skip_io; + } + for (l = j; l < k; l++) + remove_journal_node(ic, §ion_node[l]); + } + spin_unlock_irq(&ic->endio_wait.lock); + + metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset); + for (l = j; l < k; l++) { + int r; + struct journal_entry *je2 = access_journal_entry(ic, i, l); + + if ( +#ifndef INTERNAL_VERIFY + unlikely(from_replay) && +#endif + ic->internal_hash) { + char test_tag[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; + + integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block), + (char *)access_journal_data(ic, i, l), test_tag); + if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size))) { + dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ); + dm_audit_log_target(DM_MSG_PREFIX, "integrity-replay-journal", ic->ti, 0); + } + } + + journal_entry_set_unused(je2); + r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset, + ic->tag_size, TAG_WRITE); + if (unlikely(r)) + dm_integrity_io_error(ic, "reading tags", r); + } + + atomic_inc(&comp.in_flight); + copy_from_journal(ic, i, j << ic->sb->log2_sectors_per_block, + (k - j) << ic->sb->log2_sectors_per_block, + get_data_sector(ic, area, offset), + complete_copy_from_journal, io); +skip_io: + j = next_loop; + } + } + + dm_bufio_write_dirty_buffers_async(ic->bufio); + + blk_finish_plug(&plug); + + complete_journal_op(&comp); + wait_for_completion_io(&comp.comp); + + dm_integrity_flush_buffers(ic, true); +} + +static void integrity_writer(struct work_struct *w) +{ + struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, writer_work); + unsigned int write_start, write_sections; + unsigned int prev_free_sectors; + + spin_lock_irq(&ic->endio_wait.lock); + write_start = ic->committed_section; + write_sections = ic->n_committed_sections; + spin_unlock_irq(&ic->endio_wait.lock); + + if (!write_sections) + return; + + do_journal_write(ic, write_start, write_sections, false); + + spin_lock_irq(&ic->endio_wait.lock); + + ic->committed_section += write_sections; + wraparound_section(ic, &ic->committed_section); + ic->n_committed_sections -= write_sections; + + prev_free_sectors = ic->free_sectors; + ic->free_sectors += write_sections * ic->journal_section_entries; + if (unlikely(!prev_free_sectors)) + wake_up_locked(&ic->endio_wait); + + spin_unlock_irq(&ic->endio_wait.lock); +} + +static void recalc_write_super(struct dm_integrity_c *ic) +{ + int r; + + dm_integrity_flush_buffers(ic, false); + if (dm_integrity_failed(ic)) + return; + + r = sync_rw_sb(ic, REQ_OP_WRITE); + if (unlikely(r)) + dm_integrity_io_error(ic, "writing superblock", r); +} + +static void integrity_recalc(struct work_struct *w) +{ + struct dm_integrity_c *ic = container_of(w, struct dm_integrity_c, recalc_work); + size_t recalc_tags_size; + u8 *recalc_buffer = NULL; + u8 *recalc_tags = NULL; + struct dm_integrity_range range; + struct dm_io_request io_req; + struct dm_io_region io_loc; + sector_t area, offset; + sector_t metadata_block; + unsigned int metadata_offset; + sector_t logical_sector, n_sectors; + __u8 *t; + unsigned int i; + int r; + unsigned int super_counter = 0; + unsigned recalc_sectors = RECALC_SECTORS; + +retry: + recalc_buffer = __vmalloc(recalc_sectors << SECTOR_SHIFT, GFP_NOIO); + if (!recalc_buffer) { +oom: + recalc_sectors >>= 1; + if (recalc_sectors >= 1U << ic->sb->log2_sectors_per_block) + goto retry; + DMCRIT("out of memory for recalculate buffer - recalculation disabled"); + goto free_ret; + } + recalc_tags_size = (recalc_sectors >> ic->sb->log2_sectors_per_block) * ic->tag_size; + if (crypto_shash_digestsize(ic->internal_hash) > ic->tag_size) + recalc_tags_size += crypto_shash_digestsize(ic->internal_hash) - ic->tag_size; + recalc_tags = kvmalloc(recalc_tags_size, GFP_NOIO); + if (!recalc_tags) { + vfree(recalc_buffer); + recalc_buffer = NULL; + goto oom; + } + + DEBUG_print("start recalculation... (position %llx)\n", le64_to_cpu(ic->sb->recalc_sector)); + + spin_lock_irq(&ic->endio_wait.lock); + +next_chunk: + + if (unlikely(dm_post_suspending(ic->ti))) + goto unlock_ret; + + range.logical_sector = le64_to_cpu(ic->sb->recalc_sector); + if (unlikely(range.logical_sector >= ic->provided_data_sectors)) { + if (ic->mode == 'B') { + block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR); + DEBUG_print("queue_delayed_work: bitmap_flush_work\n"); + queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0); + } + goto unlock_ret; + } + + get_area_and_offset(ic, range.logical_sector, &area, &offset); + range.n_sectors = min((sector_t)recalc_sectors, ic->provided_data_sectors - range.logical_sector); + if (!ic->meta_dev) + range.n_sectors = min(range.n_sectors, ((sector_t)1U << ic->sb->log2_interleave_sectors) - (unsigned int)offset); + + add_new_range_and_wait(ic, &range); + spin_unlock_irq(&ic->endio_wait.lock); + logical_sector = range.logical_sector; + n_sectors = range.n_sectors; + + if (ic->mode == 'B') { + if (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector, n_sectors, BITMAP_OP_TEST_ALL_CLEAR)) + goto advance_and_next; + + while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector, + ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) { + logical_sector += ic->sectors_per_block; + n_sectors -= ic->sectors_per_block; + cond_resched(); + } + while (block_bitmap_op(ic, ic->recalc_bitmap, logical_sector + n_sectors - ic->sectors_per_block, + ic->sectors_per_block, BITMAP_OP_TEST_ALL_CLEAR)) { + n_sectors -= ic->sectors_per_block; + cond_resched(); + } + get_area_and_offset(ic, logical_sector, &area, &offset); + } + + DEBUG_print("recalculating: %llx, %llx\n", logical_sector, n_sectors); + + if (unlikely(++super_counter == RECALC_WRITE_SUPER)) { + recalc_write_super(ic); + if (ic->mode == 'B') + queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval); + + super_counter = 0; + } + + if (unlikely(dm_integrity_failed(ic))) + goto err; + + io_req.bi_opf = REQ_OP_READ; + io_req.mem.type = DM_IO_VMA; + io_req.mem.ptr.addr = recalc_buffer; + io_req.notify.fn = NULL; + io_req.client = ic->io; + io_loc.bdev = ic->dev->bdev; + io_loc.sector = get_data_sector(ic, area, offset); + io_loc.count = n_sectors; + + r = dm_io(&io_req, 1, &io_loc, NULL); + if (unlikely(r)) { + dm_integrity_io_error(ic, "reading data", r); + goto err; + } + + t = recalc_tags; + for (i = 0; i < n_sectors; i += ic->sectors_per_block) { + integrity_sector_checksum(ic, logical_sector + i, recalc_buffer + (i << SECTOR_SHIFT), t); + t += ic->tag_size; + } + + metadata_block = get_metadata_sector_and_offset(ic, area, offset, &metadata_offset); + + r = dm_integrity_rw_tag(ic, recalc_tags, &metadata_block, &metadata_offset, t - recalc_tags, TAG_WRITE); + if (unlikely(r)) { + dm_integrity_io_error(ic, "writing tags", r); + goto err; + } + + if (ic->mode == 'B') { + sector_t start, end; + + start = (range.logical_sector >> + (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)) << + (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit); + end = ((range.logical_sector + range.n_sectors) >> + (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit)) << + (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit); + block_bitmap_op(ic, ic->recalc_bitmap, start, end - start, BITMAP_OP_CLEAR); + } + +advance_and_next: + cond_resched(); + + spin_lock_irq(&ic->endio_wait.lock); + remove_range_unlocked(ic, &range); + ic->sb->recalc_sector = cpu_to_le64(range.logical_sector + range.n_sectors); + goto next_chunk; + +err: + remove_range(ic, &range); + goto free_ret; + +unlock_ret: + spin_unlock_irq(&ic->endio_wait.lock); + + recalc_write_super(ic); + +free_ret: + vfree(recalc_buffer); + kvfree(recalc_tags); +} + +static void bitmap_block_work(struct work_struct *w) +{ + struct bitmap_block_status *bbs = container_of(w, struct bitmap_block_status, work); + struct dm_integrity_c *ic = bbs->ic; + struct bio *bio; + struct bio_list bio_queue; + struct bio_list waiting; + + bio_list_init(&waiting); + + spin_lock(&bbs->bio_queue_lock); + bio_queue = bbs->bio_queue; + bio_list_init(&bbs->bio_queue); + spin_unlock(&bbs->bio_queue_lock); + + while ((bio = bio_list_pop(&bio_queue))) { + struct dm_integrity_io *dio; + + dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io)); + + if (block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector, + dio->range.n_sectors, BITMAP_OP_TEST_ALL_SET)) { + remove_range(ic, &dio->range); + INIT_WORK(&dio->work, integrity_bio_wait); + queue_work(ic->offload_wq, &dio->work); + } else { + block_bitmap_op(ic, ic->journal, dio->range.logical_sector, + dio->range.n_sectors, BITMAP_OP_SET); + bio_list_add(&waiting, bio); + } + } + + if (bio_list_empty(&waiting)) + return; + + rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, + bbs->idx * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), + BITMAP_BLOCK_SIZE >> SECTOR_SHIFT, NULL); + + while ((bio = bio_list_pop(&waiting))) { + struct dm_integrity_io *dio = dm_per_bio_data(bio, sizeof(struct dm_integrity_io)); + + block_bitmap_op(ic, ic->may_write_bitmap, dio->range.logical_sector, + dio->range.n_sectors, BITMAP_OP_SET); + + remove_range(ic, &dio->range); + INIT_WORK(&dio->work, integrity_bio_wait); + queue_work(ic->offload_wq, &dio->work); + } + + queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, ic->bitmap_flush_interval); +} + +static void bitmap_flush_work(struct work_struct *work) +{ + struct dm_integrity_c *ic = container_of(work, struct dm_integrity_c, bitmap_flush_work.work); + struct dm_integrity_range range; + unsigned long limit; + struct bio *bio; + + dm_integrity_flush_buffers(ic, false); + + range.logical_sector = 0; + range.n_sectors = ic->provided_data_sectors; + + spin_lock_irq(&ic->endio_wait.lock); + add_new_range_and_wait(ic, &range); + spin_unlock_irq(&ic->endio_wait.lock); + + dm_integrity_flush_buffers(ic, true); + + limit = ic->provided_data_sectors; + if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) { + limit = le64_to_cpu(ic->sb->recalc_sector) + >> (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit) + << (ic->sb->log2_sectors_per_block + ic->log2_blocks_per_bitmap_bit); + } + /*DEBUG_print("zeroing journal\n");*/ + block_bitmap_op(ic, ic->journal, 0, limit, BITMAP_OP_CLEAR); + block_bitmap_op(ic, ic->may_write_bitmap, 0, limit, BITMAP_OP_CLEAR); + + rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0, + ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL); + + spin_lock_irq(&ic->endio_wait.lock); + remove_range_unlocked(ic, &range); + while (unlikely((bio = bio_list_pop(&ic->synchronous_bios)) != NULL)) { + bio_endio(bio); + spin_unlock_irq(&ic->endio_wait.lock); + spin_lock_irq(&ic->endio_wait.lock); + } + spin_unlock_irq(&ic->endio_wait.lock); +} + + +static void init_journal(struct dm_integrity_c *ic, unsigned int start_section, + unsigned int n_sections, unsigned char commit_seq) +{ + unsigned int i, j, n; + + if (!n_sections) + return; + + for (n = 0; n < n_sections; n++) { + i = start_section + n; + wraparound_section(ic, &i); + for (j = 0; j < ic->journal_section_sectors; j++) { + struct journal_sector *js = access_journal(ic, i, j); + + BUILD_BUG_ON(sizeof(js->sectors) != JOURNAL_SECTOR_DATA); + memset(&js->sectors, 0, sizeof(js->sectors)); + js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq); + } + for (j = 0; j < ic->journal_section_entries; j++) { + struct journal_entry *je = access_journal_entry(ic, i, j); + + journal_entry_set_unused(je); + } + } + + write_journal(ic, start_section, n_sections); +} + +static int find_commit_seq(struct dm_integrity_c *ic, unsigned int i, unsigned int j, commit_id_t id) +{ + unsigned char k; + + for (k = 0; k < N_COMMIT_IDS; k++) { + if (dm_integrity_commit_id(ic, i, j, k) == id) + return k; + } + dm_integrity_io_error(ic, "journal commit id", -EIO); + return -EIO; +} + +static void replay_journal(struct dm_integrity_c *ic) +{ + unsigned int i, j; + bool used_commit_ids[N_COMMIT_IDS]; + unsigned int max_commit_id_sections[N_COMMIT_IDS]; + unsigned int write_start, write_sections; + unsigned int continue_section; + bool journal_empty; + unsigned char unused, last_used, want_commit_seq; + + if (ic->mode == 'R') + return; + + if (ic->journal_uptodate) + return; + + last_used = 0; + write_start = 0; + + if (!ic->just_formatted) { + DEBUG_print("reading journal\n"); + rw_journal(ic, REQ_OP_READ, 0, ic->journal_sections, NULL); + if (ic->journal_io) + DEBUG_bytes(lowmem_page_address(ic->journal_io[0].page), 64, "read journal"); + if (ic->journal_io) { + struct journal_completion crypt_comp; + + crypt_comp.ic = ic; + init_completion(&crypt_comp.comp); + crypt_comp.in_flight = (atomic_t)ATOMIC_INIT(0); + encrypt_journal(ic, false, 0, ic->journal_sections, &crypt_comp); + wait_for_completion(&crypt_comp.comp); + } + DEBUG_bytes(lowmem_page_address(ic->journal[0].page), 64, "decrypted journal"); + } + + if (dm_integrity_failed(ic)) + goto clear_journal; + + journal_empty = true; + memset(used_commit_ids, 0, sizeof(used_commit_ids)); + memset(max_commit_id_sections, 0, sizeof(max_commit_id_sections)); + for (i = 0; i < ic->journal_sections; i++) { + for (j = 0; j < ic->journal_section_sectors; j++) { + int k; + struct journal_sector *js = access_journal(ic, i, j); + + k = find_commit_seq(ic, i, j, js->commit_id); + if (k < 0) + goto clear_journal; + used_commit_ids[k] = true; + max_commit_id_sections[k] = i; + } + if (journal_empty) { + for (j = 0; j < ic->journal_section_entries; j++) { + struct journal_entry *je = access_journal_entry(ic, i, j); + + if (!journal_entry_is_unused(je)) { + journal_empty = false; + break; + } + } + } + } + + if (!used_commit_ids[N_COMMIT_IDS - 1]) { + unused = N_COMMIT_IDS - 1; + while (unused && !used_commit_ids[unused - 1]) + unused--; + } else { + for (unused = 0; unused < N_COMMIT_IDS; unused++) + if (!used_commit_ids[unused]) + break; + if (unused == N_COMMIT_IDS) { + dm_integrity_io_error(ic, "journal commit ids", -EIO); + goto clear_journal; + } + } + DEBUG_print("first unused commit seq %d [%d,%d,%d,%d]\n", + unused, used_commit_ids[0], used_commit_ids[1], + used_commit_ids[2], used_commit_ids[3]); + + last_used = prev_commit_seq(unused); + want_commit_seq = prev_commit_seq(last_used); + + if (!used_commit_ids[want_commit_seq] && used_commit_ids[prev_commit_seq(want_commit_seq)]) + journal_empty = true; + + write_start = max_commit_id_sections[last_used] + 1; + if (unlikely(write_start >= ic->journal_sections)) + want_commit_seq = next_commit_seq(want_commit_seq); + wraparound_section(ic, &write_start); + + i = write_start; + for (write_sections = 0; write_sections < ic->journal_sections; write_sections++) { + for (j = 0; j < ic->journal_section_sectors; j++) { + struct journal_sector *js = access_journal(ic, i, j); + + if (js->commit_id != dm_integrity_commit_id(ic, i, j, want_commit_seq)) { + /* + * This could be caused by crash during writing. + * We won't replay the inconsistent part of the + * journal. + */ + DEBUG_print("commit id mismatch at position (%u, %u): %d != %d\n", + i, j, find_commit_seq(ic, i, j, js->commit_id), want_commit_seq); + goto brk; + } + } + i++; + if (unlikely(i >= ic->journal_sections)) + want_commit_seq = next_commit_seq(want_commit_seq); + wraparound_section(ic, &i); + } +brk: + + if (!journal_empty) { + DEBUG_print("replaying %u sections, starting at %u, commit seq %d\n", + write_sections, write_start, want_commit_seq); + do_journal_write(ic, write_start, write_sections, true); + } + + if (write_sections == ic->journal_sections && (ic->mode == 'J' || journal_empty)) { + continue_section = write_start; + ic->commit_seq = want_commit_seq; + DEBUG_print("continuing from section %u, commit seq %d\n", write_start, ic->commit_seq); + } else { + unsigned int s; + unsigned char erase_seq; + +clear_journal: + DEBUG_print("clearing journal\n"); + + erase_seq = prev_commit_seq(prev_commit_seq(last_used)); + s = write_start; + init_journal(ic, s, 1, erase_seq); + s++; + wraparound_section(ic, &s); + if (ic->journal_sections >= 2) { + init_journal(ic, s, ic->journal_sections - 2, erase_seq); + s += ic->journal_sections - 2; + wraparound_section(ic, &s); + init_journal(ic, s, 1, erase_seq); + } + + continue_section = 0; + ic->commit_seq = next_commit_seq(erase_seq); + } + + ic->committed_section = continue_section; + ic->n_committed_sections = 0; + + ic->uncommitted_section = continue_section; + ic->n_uncommitted_sections = 0; + + ic->free_section = continue_section; + ic->free_section_entry = 0; + ic->free_sectors = ic->journal_entries; + + ic->journal_tree_root = RB_ROOT; + for (i = 0; i < ic->journal_entries; i++) + init_journal_node(&ic->journal_tree[i]); +} + +static void dm_integrity_enter_synchronous_mode(struct dm_integrity_c *ic) +{ + DEBUG_print("%s\n", __func__); + + if (ic->mode == 'B') { + ic->bitmap_flush_interval = msecs_to_jiffies(10) + 1; + ic->synchronous_mode = 1; + + cancel_delayed_work_sync(&ic->bitmap_flush_work); + queue_delayed_work(ic->commit_wq, &ic->bitmap_flush_work, 0); + flush_workqueue(ic->commit_wq); + } +} + +static int dm_integrity_reboot(struct notifier_block *n, unsigned long code, void *x) +{ + struct dm_integrity_c *ic = container_of(n, struct dm_integrity_c, reboot_notifier); + + DEBUG_print("%s\n", __func__); + + dm_integrity_enter_synchronous_mode(ic); + + return NOTIFY_DONE; +} + +static void dm_integrity_postsuspend(struct dm_target *ti) +{ + struct dm_integrity_c *ic = ti->private; + int r; + + WARN_ON(unregister_reboot_notifier(&ic->reboot_notifier)); + + del_timer_sync(&ic->autocommit_timer); + + if (ic->recalc_wq) + drain_workqueue(ic->recalc_wq); + + if (ic->mode == 'B') + cancel_delayed_work_sync(&ic->bitmap_flush_work); + + queue_work(ic->commit_wq, &ic->commit_work); + drain_workqueue(ic->commit_wq); + + if (ic->mode == 'J') { + queue_work(ic->writer_wq, &ic->writer_work); + drain_workqueue(ic->writer_wq); + dm_integrity_flush_buffers(ic, true); + if (ic->wrote_to_journal) { + init_journal(ic, ic->free_section, + ic->journal_sections - ic->free_section, ic->commit_seq); + if (ic->free_section) { + init_journal(ic, 0, ic->free_section, + next_commit_seq(ic->commit_seq)); + } + } + } + + if (ic->mode == 'B') { + dm_integrity_flush_buffers(ic, true); +#if 1 + /* set to 0 to test bitmap replay code */ + init_journal(ic, 0, ic->journal_sections, 0); + ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP); + r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA); + if (unlikely(r)) + dm_integrity_io_error(ic, "writing superblock", r); +#endif + } + + BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress)); + + ic->journal_uptodate = true; +} + +static void dm_integrity_resume(struct dm_target *ti) +{ + struct dm_integrity_c *ic = ti->private; + __u64 old_provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors); + int r; + + DEBUG_print("resume\n"); + + ic->wrote_to_journal = false; + + if (ic->provided_data_sectors != old_provided_data_sectors) { + if (ic->provided_data_sectors > old_provided_data_sectors && + ic->mode == 'B' && + ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) { + rw_journal_sectors(ic, REQ_OP_READ, 0, + ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL); + block_bitmap_op(ic, ic->journal, old_provided_data_sectors, + ic->provided_data_sectors - old_provided_data_sectors, BITMAP_OP_SET); + rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0, + ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL); + } + + ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors); + r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA); + if (unlikely(r)) + dm_integrity_io_error(ic, "writing superblock", r); + } + + if (ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP)) { + DEBUG_print("resume dirty_bitmap\n"); + rw_journal_sectors(ic, REQ_OP_READ, 0, + ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL); + if (ic->mode == 'B') { + if (ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit && + !ic->reset_recalculate_flag) { + block_bitmap_copy(ic, ic->recalc_bitmap, ic->journal); + block_bitmap_copy(ic, ic->may_write_bitmap, ic->journal); + if (!block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, + BITMAP_OP_TEST_ALL_CLEAR)) { + ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING); + ic->sb->recalc_sector = cpu_to_le64(0); + } + } else { + DEBUG_print("non-matching blocks_per_bitmap_bit: %u, %u\n", + ic->sb->log2_blocks_per_bitmap_bit, ic->log2_blocks_per_bitmap_bit); + ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit; + block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET); + block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_SET); + block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_SET); + rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0, + ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL); + ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING); + ic->sb->recalc_sector = cpu_to_le64(0); + } + } else { + if (!(ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit && + block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR)) || + ic->reset_recalculate_flag) { + ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING); + ic->sb->recalc_sector = cpu_to_le64(0); + } + init_journal(ic, 0, ic->journal_sections, 0); + replay_journal(ic); + ic->sb->flags &= ~cpu_to_le32(SB_FLAG_DIRTY_BITMAP); + } + r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA); + if (unlikely(r)) + dm_integrity_io_error(ic, "writing superblock", r); + } else { + replay_journal(ic); + if (ic->reset_recalculate_flag) { + ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING); + ic->sb->recalc_sector = cpu_to_le64(0); + } + if (ic->mode == 'B') { + ic->sb->flags |= cpu_to_le32(SB_FLAG_DIRTY_BITMAP); + ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit; + r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA); + if (unlikely(r)) + dm_integrity_io_error(ic, "writing superblock", r); + + block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR); + block_bitmap_op(ic, ic->recalc_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR); + block_bitmap_op(ic, ic->may_write_bitmap, 0, ic->provided_data_sectors, BITMAP_OP_CLEAR); + if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) && + le64_to_cpu(ic->sb->recalc_sector) < ic->provided_data_sectors) { + block_bitmap_op(ic, ic->journal, le64_to_cpu(ic->sb->recalc_sector), + ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET); + block_bitmap_op(ic, ic->recalc_bitmap, le64_to_cpu(ic->sb->recalc_sector), + ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET); + block_bitmap_op(ic, ic->may_write_bitmap, le64_to_cpu(ic->sb->recalc_sector), + ic->provided_data_sectors - le64_to_cpu(ic->sb->recalc_sector), BITMAP_OP_SET); + } + rw_journal_sectors(ic, REQ_OP_WRITE | REQ_FUA | REQ_SYNC, 0, + ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL); + } + } + + DEBUG_print("testing recalc: %x\n", ic->sb->flags); + if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) { + __u64 recalc_pos = le64_to_cpu(ic->sb->recalc_sector); + + DEBUG_print("recalc pos: %llx / %llx\n", recalc_pos, ic->provided_data_sectors); + if (recalc_pos < ic->provided_data_sectors) { + queue_work(ic->recalc_wq, &ic->recalc_work); + } else if (recalc_pos > ic->provided_data_sectors) { + ic->sb->recalc_sector = cpu_to_le64(ic->provided_data_sectors); + recalc_write_super(ic); + } + } + + ic->reboot_notifier.notifier_call = dm_integrity_reboot; + ic->reboot_notifier.next = NULL; + ic->reboot_notifier.priority = INT_MAX - 1; /* be notified after md and before hardware drivers */ + WARN_ON(register_reboot_notifier(&ic->reboot_notifier)); + +#if 0 + /* set to 1 to stress test synchronous mode */ + dm_integrity_enter_synchronous_mode(ic); +#endif +} + +static void dm_integrity_status(struct dm_target *ti, status_type_t type, + unsigned int status_flags, char *result, unsigned int maxlen) +{ + struct dm_integrity_c *ic = ti->private; + unsigned int arg_count; + size_t sz = 0; + + switch (type) { + case STATUSTYPE_INFO: + DMEMIT("%llu %llu", + (unsigned long long)atomic64_read(&ic->number_of_mismatches), + ic->provided_data_sectors); + if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) + DMEMIT(" %llu", le64_to_cpu(ic->sb->recalc_sector)); + else + DMEMIT(" -"); + break; + + case STATUSTYPE_TABLE: { + __u64 watermark_percentage = (__u64)(ic->journal_entries - ic->free_sectors_threshold) * 100; + + watermark_percentage += ic->journal_entries / 2; + do_div(watermark_percentage, ic->journal_entries); + arg_count = 3; + arg_count += !!ic->meta_dev; + arg_count += ic->sectors_per_block != 1; + arg_count += !!(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)); + arg_count += ic->reset_recalculate_flag; + arg_count += ic->discard; + arg_count += ic->mode == 'J'; + arg_count += ic->mode == 'J'; + arg_count += ic->mode == 'B'; + arg_count += ic->mode == 'B'; + arg_count += !!ic->internal_hash_alg.alg_string; + arg_count += !!ic->journal_crypt_alg.alg_string; + arg_count += !!ic->journal_mac_alg.alg_string; + arg_count += (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0; + arg_count += (ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0; + arg_count += ic->legacy_recalculate; + DMEMIT("%s %llu %u %c %u", ic->dev->name, ic->start, + ic->tag_size, ic->mode, arg_count); + if (ic->meta_dev) + DMEMIT(" meta_device:%s", ic->meta_dev->name); + if (ic->sectors_per_block != 1) + DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT); + if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) + DMEMIT(" recalculate"); + if (ic->reset_recalculate_flag) + DMEMIT(" reset_recalculate"); + if (ic->discard) + DMEMIT(" allow_discards"); + DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS); + DMEMIT(" interleave_sectors:%u", 1U << ic->sb->log2_interleave_sectors); + DMEMIT(" buffer_sectors:%u", 1U << ic->log2_buffer_sectors); + if (ic->mode == 'J') { + DMEMIT(" journal_watermark:%u", (unsigned int)watermark_percentage); + DMEMIT(" commit_time:%u", ic->autocommit_msec); + } + if (ic->mode == 'B') { + DMEMIT(" sectors_per_bit:%llu", (sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit); + DMEMIT(" bitmap_flush_interval:%u", jiffies_to_msecs(ic->bitmap_flush_interval)); + } + if ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0) + DMEMIT(" fix_padding"); + if ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0) + DMEMIT(" fix_hmac"); + if (ic->legacy_recalculate) + DMEMIT(" legacy_recalculate"); + +#define EMIT_ALG(a, n) \ + do { \ + if (ic->a.alg_string) { \ + DMEMIT(" %s:%s", n, ic->a.alg_string); \ + if (ic->a.key_string) \ + DMEMIT(":%s", ic->a.key_string);\ + } \ + } while (0) + EMIT_ALG(internal_hash_alg, "internal_hash"); + EMIT_ALG(journal_crypt_alg, "journal_crypt"); + EMIT_ALG(journal_mac_alg, "journal_mac"); + break; + } + case STATUSTYPE_IMA: + DMEMIT_TARGET_NAME_VERSION(ti->type); + DMEMIT(",dev_name=%s,start=%llu,tag_size=%u,mode=%c", + ic->dev->name, ic->start, ic->tag_size, ic->mode); + + if (ic->meta_dev) + DMEMIT(",meta_device=%s", ic->meta_dev->name); + if (ic->sectors_per_block != 1) + DMEMIT(",block_size=%u", ic->sectors_per_block << SECTOR_SHIFT); + + DMEMIT(",recalculate=%c", (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) ? + 'y' : 'n'); + DMEMIT(",allow_discards=%c", ic->discard ? 'y' : 'n'); + DMEMIT(",fix_padding=%c", + ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING)) != 0) ? 'y' : 'n'); + DMEMIT(",fix_hmac=%c", + ((ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_HMAC)) != 0) ? 'y' : 'n'); + DMEMIT(",legacy_recalculate=%c", ic->legacy_recalculate ? 'y' : 'n'); + + DMEMIT(",journal_sectors=%u", ic->initial_sectors - SB_SECTORS); + DMEMIT(",interleave_sectors=%u", 1U << ic->sb->log2_interleave_sectors); + DMEMIT(",buffer_sectors=%u", 1U << ic->log2_buffer_sectors); + DMEMIT(";"); + break; + } +} + +static int dm_integrity_iterate_devices(struct dm_target *ti, + iterate_devices_callout_fn fn, void *data) +{ + struct dm_integrity_c *ic = ti->private; + + if (!ic->meta_dev) + return fn(ti, ic->dev, ic->start + ic->initial_sectors + ic->metadata_run, ti->len, data); + else + return fn(ti, ic->dev, 0, ti->len, data); +} + +static void dm_integrity_io_hints(struct dm_target *ti, struct queue_limits *limits) +{ + struct dm_integrity_c *ic = ti->private; + + if (ic->sectors_per_block > 1) { + limits->logical_block_size = ic->sectors_per_block << SECTOR_SHIFT; + limits->physical_block_size = ic->sectors_per_block << SECTOR_SHIFT; + blk_limits_io_min(limits, ic->sectors_per_block << SECTOR_SHIFT); + limits->dma_alignment = limits->logical_block_size - 1; + } +} + +static void calculate_journal_section_size(struct dm_integrity_c *ic) +{ + unsigned int sector_space = JOURNAL_SECTOR_DATA; + + ic->journal_sections = le32_to_cpu(ic->sb->journal_sections); + ic->journal_entry_size = roundup(offsetof(struct journal_entry, last_bytes[ic->sectors_per_block]) + ic->tag_size, + JOURNAL_ENTRY_ROUNDUP); + + if (ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) + sector_space -= JOURNAL_MAC_PER_SECTOR; + ic->journal_entries_per_sector = sector_space / ic->journal_entry_size; + ic->journal_section_entries = ic->journal_entries_per_sector * JOURNAL_BLOCK_SECTORS; + ic->journal_section_sectors = (ic->journal_section_entries << ic->sb->log2_sectors_per_block) + JOURNAL_BLOCK_SECTORS; + ic->journal_entries = ic->journal_section_entries * ic->journal_sections; +} + +static int calculate_device_limits(struct dm_integrity_c *ic) +{ + __u64 initial_sectors; + + calculate_journal_section_size(ic); + initial_sectors = SB_SECTORS + (__u64)ic->journal_section_sectors * ic->journal_sections; + if (initial_sectors + METADATA_PADDING_SECTORS >= ic->meta_device_sectors || initial_sectors > UINT_MAX) + return -EINVAL; + ic->initial_sectors = initial_sectors; + + if (!ic->meta_dev) { + sector_t last_sector, last_area, last_offset; + + /* we have to maintain excessive padding for compatibility with existing volumes */ + __u64 metadata_run_padding = + ic->sb->flags & cpu_to_le32(SB_FLAG_FIXED_PADDING) ? + (__u64)(METADATA_PADDING_SECTORS << SECTOR_SHIFT) : + (__u64)(1 << SECTOR_SHIFT << METADATA_PADDING_SECTORS); + + ic->metadata_run = round_up((__u64)ic->tag_size << (ic->sb->log2_interleave_sectors - ic->sb->log2_sectors_per_block), + metadata_run_padding) >> SECTOR_SHIFT; + if (!(ic->metadata_run & (ic->metadata_run - 1))) + ic->log2_metadata_run = __ffs(ic->metadata_run); + else + ic->log2_metadata_run = -1; + + get_area_and_offset(ic, ic->provided_data_sectors - 1, &last_area, &last_offset); + last_sector = get_data_sector(ic, last_area, last_offset); + if (last_sector < ic->start || last_sector >= ic->meta_device_sectors) + return -EINVAL; + } else { + __u64 meta_size = (ic->provided_data_sectors >> ic->sb->log2_sectors_per_block) * ic->tag_size; + + meta_size = (meta_size + ((1U << (ic->log2_buffer_sectors + SECTOR_SHIFT)) - 1)) + >> (ic->log2_buffer_sectors + SECTOR_SHIFT); + meta_size <<= ic->log2_buffer_sectors; + if (ic->initial_sectors + meta_size < ic->initial_sectors || + ic->initial_sectors + meta_size > ic->meta_device_sectors) + return -EINVAL; + ic->metadata_run = 1; + ic->log2_metadata_run = 0; + } + + return 0; +} + +static void get_provided_data_sectors(struct dm_integrity_c *ic) +{ + if (!ic->meta_dev) { + int test_bit; + + ic->provided_data_sectors = 0; + for (test_bit = fls64(ic->meta_device_sectors) - 1; test_bit >= 3; test_bit--) { + __u64 prev_data_sectors = ic->provided_data_sectors; + + ic->provided_data_sectors |= (sector_t)1 << test_bit; + if (calculate_device_limits(ic)) + ic->provided_data_sectors = prev_data_sectors; + } + } else { + ic->provided_data_sectors = ic->data_device_sectors; + ic->provided_data_sectors &= ~(sector_t)(ic->sectors_per_block - 1); + } +} + +static int initialize_superblock(struct dm_integrity_c *ic, + unsigned int journal_sectors, unsigned int interleave_sectors) +{ + unsigned int journal_sections; + int test_bit; + + memset(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT); + memcpy(ic->sb->magic, SB_MAGIC, 8); + ic->sb->integrity_tag_size = cpu_to_le16(ic->tag_size); + ic->sb->log2_sectors_per_block = __ffs(ic->sectors_per_block); + if (ic->journal_mac_alg.alg_string) + ic->sb->flags |= cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC); + + calculate_journal_section_size(ic); + journal_sections = journal_sectors / ic->journal_section_sectors; + if (!journal_sections) + journal_sections = 1; + + if (ic->fix_hmac && (ic->internal_hash_alg.alg_string || ic->journal_mac_alg.alg_string)) { + ic->sb->flags |= cpu_to_le32(SB_FLAG_FIXED_HMAC); + get_random_bytes(ic->sb->salt, SALT_SIZE); + } + + if (!ic->meta_dev) { + if (ic->fix_padding) + ic->sb->flags |= cpu_to_le32(SB_FLAG_FIXED_PADDING); + ic->sb->journal_sections = cpu_to_le32(journal_sections); + if (!interleave_sectors) + interleave_sectors = DEFAULT_INTERLEAVE_SECTORS; + ic->sb->log2_interleave_sectors = __fls(interleave_sectors); + ic->sb->log2_interleave_sectors = max_t(__u8, MIN_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors); + ic->sb->log2_interleave_sectors = min_t(__u8, MAX_LOG2_INTERLEAVE_SECTORS, ic->sb->log2_interleave_sectors); + + get_provided_data_sectors(ic); + if (!ic->provided_data_sectors) + return -EINVAL; + } else { + ic->sb->log2_interleave_sectors = 0; + + get_provided_data_sectors(ic); + if (!ic->provided_data_sectors) + return -EINVAL; + +try_smaller_buffer: + ic->sb->journal_sections = cpu_to_le32(0); + for (test_bit = fls(journal_sections) - 1; test_bit >= 0; test_bit--) { + __u32 prev_journal_sections = le32_to_cpu(ic->sb->journal_sections); + __u32 test_journal_sections = prev_journal_sections | (1U << test_bit); + + if (test_journal_sections > journal_sections) + continue; + ic->sb->journal_sections = cpu_to_le32(test_journal_sections); + if (calculate_device_limits(ic)) + ic->sb->journal_sections = cpu_to_le32(prev_journal_sections); + + } + if (!le32_to_cpu(ic->sb->journal_sections)) { + if (ic->log2_buffer_sectors > 3) { + ic->log2_buffer_sectors--; + goto try_smaller_buffer; + } + return -EINVAL; + } + } + + ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors); + + sb_set_version(ic); + + return 0; +} + +static void dm_integrity_set(struct dm_target *ti, struct dm_integrity_c *ic) +{ + struct gendisk *disk = dm_disk(dm_table_get_md(ti->table)); + struct blk_integrity bi; + + memset(&bi, 0, sizeof(bi)); + bi.profile = &dm_integrity_profile; + bi.tuple_size = ic->tag_size; + bi.tag_size = bi.tuple_size; + bi.interval_exp = ic->sb->log2_sectors_per_block + SECTOR_SHIFT; + + blk_integrity_register(disk, &bi); + blk_queue_max_integrity_segments(disk->queue, UINT_MAX); +} + +static void dm_integrity_free_page_list(struct page_list *pl) +{ + unsigned int i; + + if (!pl) + return; + for (i = 0; pl[i].page; i++) + __free_page(pl[i].page); + kvfree(pl); +} + +static struct page_list *dm_integrity_alloc_page_list(unsigned int n_pages) +{ + struct page_list *pl; + unsigned int i; + + pl = kvmalloc_array(n_pages + 1, sizeof(struct page_list), GFP_KERNEL | __GFP_ZERO); + if (!pl) + return NULL; + + for (i = 0; i < n_pages; i++) { + pl[i].page = alloc_page(GFP_KERNEL); + if (!pl[i].page) { + dm_integrity_free_page_list(pl); + return NULL; + } + if (i) + pl[i - 1].next = &pl[i]; + } + pl[i].page = NULL; + pl[i].next = NULL; + + return pl; +} + +static void dm_integrity_free_journal_scatterlist(struct dm_integrity_c *ic, struct scatterlist **sl) +{ + unsigned int i; + + for (i = 0; i < ic->journal_sections; i++) + kvfree(sl[i]); + kvfree(sl); +} + +static struct scatterlist **dm_integrity_alloc_journal_scatterlist(struct dm_integrity_c *ic, + struct page_list *pl) +{ + struct scatterlist **sl; + unsigned int i; + + sl = kvmalloc_array(ic->journal_sections, + sizeof(struct scatterlist *), + GFP_KERNEL | __GFP_ZERO); + if (!sl) + return NULL; + + for (i = 0; i < ic->journal_sections; i++) { + struct scatterlist *s; + unsigned int start_index, start_offset; + unsigned int end_index, end_offset; + unsigned int n_pages; + unsigned int idx; + + page_list_location(ic, i, 0, &start_index, &start_offset); + page_list_location(ic, i, ic->journal_section_sectors - 1, + &end_index, &end_offset); + + n_pages = (end_index - start_index + 1); + + s = kvmalloc_array(n_pages, sizeof(struct scatterlist), + GFP_KERNEL); + if (!s) { + dm_integrity_free_journal_scatterlist(ic, sl); + return NULL; + } + + sg_init_table(s, n_pages); + for (idx = start_index; idx <= end_index; idx++) { + char *va = lowmem_page_address(pl[idx].page); + unsigned int start = 0, end = PAGE_SIZE; + + if (idx == start_index) + start = start_offset; + if (idx == end_index) + end = end_offset + (1 << SECTOR_SHIFT); + sg_set_buf(&s[idx - start_index], va + start, end - start); + } + + sl[i] = s; + } + + return sl; +} + +static void free_alg(struct alg_spec *a) +{ + kfree_sensitive(a->alg_string); + kfree_sensitive(a->key); + memset(a, 0, sizeof(*a)); +} + +static int get_alg_and_key(const char *arg, struct alg_spec *a, char **error, char *error_inval) +{ + char *k; + + free_alg(a); + + a->alg_string = kstrdup(strchr(arg, ':') + 1, GFP_KERNEL); + if (!a->alg_string) + goto nomem; + + k = strchr(a->alg_string, ':'); + if (k) { + *k = 0; + a->key_string = k + 1; + if (strlen(a->key_string) & 1) + goto inval; + + a->key_size = strlen(a->key_string) / 2; + a->key = kmalloc(a->key_size, GFP_KERNEL); + if (!a->key) + goto nomem; + if (hex2bin(a->key, a->key_string, a->key_size)) + goto inval; + } + + return 0; +inval: + *error = error_inval; + return -EINVAL; +nomem: + *error = "Out of memory for an argument"; + return -ENOMEM; +} + +static int get_mac(struct crypto_shash **hash, struct alg_spec *a, char **error, + char *error_alg, char *error_key) +{ + int r; + + if (a->alg_string) { + *hash = crypto_alloc_shash(a->alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY); + if (IS_ERR(*hash)) { + *error = error_alg; + r = PTR_ERR(*hash); + *hash = NULL; + return r; + } + + if (a->key) { + r = crypto_shash_setkey(*hash, a->key, a->key_size); + if (r) { + *error = error_key; + return r; + } + } else if (crypto_shash_get_flags(*hash) & CRYPTO_TFM_NEED_KEY) { + *error = error_key; + return -ENOKEY; + } + } + + return 0; +} + +static int create_journal(struct dm_integrity_c *ic, char **error) +{ + int r = 0; + unsigned int i; + __u64 journal_pages, journal_desc_size, journal_tree_size; + unsigned char *crypt_data = NULL, *crypt_iv = NULL; + struct skcipher_request *req = NULL; + + ic->commit_ids[0] = cpu_to_le64(0x1111111111111111ULL); + ic->commit_ids[1] = cpu_to_le64(0x2222222222222222ULL); + ic->commit_ids[2] = cpu_to_le64(0x3333333333333333ULL); + ic->commit_ids[3] = cpu_to_le64(0x4444444444444444ULL); + + journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors, + PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT); + journal_desc_size = journal_pages * sizeof(struct page_list); + if (journal_pages >= totalram_pages() - totalhigh_pages() || journal_desc_size > ULONG_MAX) { + *error = "Journal doesn't fit into memory"; + r = -ENOMEM; + goto bad; + } + ic->journal_pages = journal_pages; + + ic->journal = dm_integrity_alloc_page_list(ic->journal_pages); + if (!ic->journal) { + *error = "Could not allocate memory for journal"; + r = -ENOMEM; + goto bad; + } + if (ic->journal_crypt_alg.alg_string) { + unsigned int ivsize, blocksize; + struct journal_completion comp; + + comp.ic = ic; + ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY); + if (IS_ERR(ic->journal_crypt)) { + *error = "Invalid journal cipher"; + r = PTR_ERR(ic->journal_crypt); + ic->journal_crypt = NULL; + goto bad; + } + ivsize = crypto_skcipher_ivsize(ic->journal_crypt); + blocksize = crypto_skcipher_blocksize(ic->journal_crypt); + + if (ic->journal_crypt_alg.key) { + r = crypto_skcipher_setkey(ic->journal_crypt, ic->journal_crypt_alg.key, + ic->journal_crypt_alg.key_size); + if (r) { + *error = "Error setting encryption key"; + goto bad; + } + } + DEBUG_print("cipher %s, block size %u iv size %u\n", + ic->journal_crypt_alg.alg_string, blocksize, ivsize); + + ic->journal_io = dm_integrity_alloc_page_list(ic->journal_pages); + if (!ic->journal_io) { + *error = "Could not allocate memory for journal io"; + r = -ENOMEM; + goto bad; + } + + if (blocksize == 1) { + struct scatterlist *sg; + + req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL); + if (!req) { + *error = "Could not allocate crypt request"; + r = -ENOMEM; + goto bad; + } + + crypt_iv = kzalloc(ivsize, GFP_KERNEL); + if (!crypt_iv) { + *error = "Could not allocate iv"; + r = -ENOMEM; + goto bad; + } + + ic->journal_xor = dm_integrity_alloc_page_list(ic->journal_pages); + if (!ic->journal_xor) { + *error = "Could not allocate memory for journal xor"; + r = -ENOMEM; + goto bad; + } + + sg = kvmalloc_array(ic->journal_pages + 1, + sizeof(struct scatterlist), + GFP_KERNEL); + if (!sg) { + *error = "Unable to allocate sg list"; + r = -ENOMEM; + goto bad; + } + sg_init_table(sg, ic->journal_pages + 1); + for (i = 0; i < ic->journal_pages; i++) { + char *va = lowmem_page_address(ic->journal_xor[i].page); + + clear_page(va); + sg_set_buf(&sg[i], va, PAGE_SIZE); + } + sg_set_buf(&sg[i], &ic->commit_ids, sizeof(ic->commit_ids)); + + skcipher_request_set_crypt(req, sg, sg, + PAGE_SIZE * ic->journal_pages + sizeof(ic->commit_ids), crypt_iv); + init_completion(&comp.comp); + comp.in_flight = (atomic_t)ATOMIC_INIT(1); + if (do_crypt(true, req, &comp)) + wait_for_completion(&comp.comp); + kvfree(sg); + r = dm_integrity_failed(ic); + if (r) { + *error = "Unable to encrypt journal"; + goto bad; + } + DEBUG_bytes(lowmem_page_address(ic->journal_xor[0].page), 64, "xor data"); + + crypto_free_skcipher(ic->journal_crypt); + ic->journal_crypt = NULL; + } else { + unsigned int crypt_len = roundup(ivsize, blocksize); + + req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL); + if (!req) { + *error = "Could not allocate crypt request"; + r = -ENOMEM; + goto bad; + } + + crypt_iv = kmalloc(ivsize, GFP_KERNEL); + if (!crypt_iv) { + *error = "Could not allocate iv"; + r = -ENOMEM; + goto bad; + } + + crypt_data = kmalloc(crypt_len, GFP_KERNEL); + if (!crypt_data) { + *error = "Unable to allocate crypt data"; + r = -ENOMEM; + goto bad; + } + + ic->journal_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal); + if (!ic->journal_scatterlist) { + *error = "Unable to allocate sg list"; + r = -ENOMEM; + goto bad; + } + ic->journal_io_scatterlist = dm_integrity_alloc_journal_scatterlist(ic, ic->journal_io); + if (!ic->journal_io_scatterlist) { + *error = "Unable to allocate sg list"; + r = -ENOMEM; + goto bad; + } + ic->sk_requests = kvmalloc_array(ic->journal_sections, + sizeof(struct skcipher_request *), + GFP_KERNEL | __GFP_ZERO); + if (!ic->sk_requests) { + *error = "Unable to allocate sk requests"; + r = -ENOMEM; + goto bad; + } + for (i = 0; i < ic->journal_sections; i++) { + struct scatterlist sg; + struct skcipher_request *section_req; + __le32 section_le = cpu_to_le32(i); + + memset(crypt_iv, 0x00, ivsize); + memset(crypt_data, 0x00, crypt_len); + memcpy(crypt_data, §ion_le, min_t(size_t, crypt_len, sizeof(section_le))); + + sg_init_one(&sg, crypt_data, crypt_len); + skcipher_request_set_crypt(req, &sg, &sg, crypt_len, crypt_iv); + init_completion(&comp.comp); + comp.in_flight = (atomic_t)ATOMIC_INIT(1); + if (do_crypt(true, req, &comp)) + wait_for_completion(&comp.comp); + + r = dm_integrity_failed(ic); + if (r) { + *error = "Unable to generate iv"; + goto bad; + } + + section_req = skcipher_request_alloc(ic->journal_crypt, GFP_KERNEL); + if (!section_req) { + *error = "Unable to allocate crypt request"; + r = -ENOMEM; + goto bad; + } + section_req->iv = kmalloc_array(ivsize, 2, + GFP_KERNEL); + if (!section_req->iv) { + skcipher_request_free(section_req); + *error = "Unable to allocate iv"; + r = -ENOMEM; + goto bad; + } + memcpy(section_req->iv + ivsize, crypt_data, ivsize); + section_req->cryptlen = (size_t)ic->journal_section_sectors << SECTOR_SHIFT; + ic->sk_requests[i] = section_req; + DEBUG_bytes(crypt_data, ivsize, "iv(%u)", i); + } + } + } + + for (i = 0; i < N_COMMIT_IDS; i++) { + unsigned int j; + +retest_commit_id: + for (j = 0; j < i; j++) { + if (ic->commit_ids[j] == ic->commit_ids[i]) { + ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1); + goto retest_commit_id; + } + } + DEBUG_print("commit id %u: %016llx\n", i, ic->commit_ids[i]); + } + + journal_tree_size = (__u64)ic->journal_entries * sizeof(struct journal_node); + if (journal_tree_size > ULONG_MAX) { + *error = "Journal doesn't fit into memory"; + r = -ENOMEM; + goto bad; + } + ic->journal_tree = kvmalloc(journal_tree_size, GFP_KERNEL); + if (!ic->journal_tree) { + *error = "Could not allocate memory for journal tree"; + r = -ENOMEM; + } +bad: + kfree(crypt_data); + kfree(crypt_iv); + skcipher_request_free(req); + + return r; +} + +/* + * Construct a integrity mapping + * + * Arguments: + * device + * offset from the start of the device + * tag size + * D - direct writes, J - journal writes, B - bitmap mode, R - recovery mode + * number of optional arguments + * optional arguments: + * journal_sectors + * interleave_sectors + * buffer_sectors + * journal_watermark + * commit_time + * meta_device + * block_size + * sectors_per_bit + * bitmap_flush_interval + * internal_hash + * journal_crypt + * journal_mac + * recalculate + */ +static int dm_integrity_ctr(struct dm_target *ti, unsigned int argc, char **argv) +{ + struct dm_integrity_c *ic; + char dummy; + int r; + unsigned int extra_args; + struct dm_arg_set as; + static const struct dm_arg _args[] = { + {0, 18, "Invalid number of feature args"}, + }; + unsigned int journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec; + bool should_write_sb; + __u64 threshold; + unsigned long long start; + __s8 log2_sectors_per_bitmap_bit = -1; + __s8 log2_blocks_per_bitmap_bit; + __u64 bits_in_journal; + __u64 n_bitmap_bits; + +#define DIRECT_ARGUMENTS 4 + + if (argc <= DIRECT_ARGUMENTS) { + ti->error = "Invalid argument count"; + return -EINVAL; + } + + ic = kzalloc(sizeof(struct dm_integrity_c), GFP_KERNEL); + if (!ic) { + ti->error = "Cannot allocate integrity context"; + return -ENOMEM; + } + ti->private = ic; + ti->per_io_data_size = sizeof(struct dm_integrity_io); + ic->ti = ti; + + ic->in_progress = RB_ROOT; + INIT_LIST_HEAD(&ic->wait_list); + init_waitqueue_head(&ic->endio_wait); + bio_list_init(&ic->flush_bio_list); + init_waitqueue_head(&ic->copy_to_journal_wait); + init_completion(&ic->crypto_backoff); + atomic64_set(&ic->number_of_mismatches, 0); + ic->bitmap_flush_interval = BITMAP_FLUSH_INTERVAL; + + r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &ic->dev); + if (r) { + ti->error = "Device lookup failed"; + goto bad; + } + + if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) { + ti->error = "Invalid starting offset"; + r = -EINVAL; + goto bad; + } + ic->start = start; + + if (strcmp(argv[2], "-")) { + if (sscanf(argv[2], "%u%c", &ic->tag_size, &dummy) != 1 || !ic->tag_size) { + ti->error = "Invalid tag size"; + r = -EINVAL; + goto bad; + } + } + + if (!strcmp(argv[3], "J") || !strcmp(argv[3], "B") || + !strcmp(argv[3], "D") || !strcmp(argv[3], "R")) { + ic->mode = argv[3][0]; + } else { + ti->error = "Invalid mode (expecting J, B, D, R)"; + r = -EINVAL; + goto bad; + } + + journal_sectors = 0; + interleave_sectors = DEFAULT_INTERLEAVE_SECTORS; + buffer_sectors = DEFAULT_BUFFER_SECTORS; + journal_watermark = DEFAULT_JOURNAL_WATERMARK; + sync_msec = DEFAULT_SYNC_MSEC; + ic->sectors_per_block = 1; + + as.argc = argc - DIRECT_ARGUMENTS; + as.argv = argv + DIRECT_ARGUMENTS; + r = dm_read_arg_group(_args, &as, &extra_args, &ti->error); + if (r) + goto bad; + + while (extra_args--) { + const char *opt_string; + unsigned int val; + unsigned long long llval; + + opt_string = dm_shift_arg(&as); + if (!opt_string) { + r = -EINVAL; + ti->error = "Not enough feature arguments"; + goto bad; + } + if (sscanf(opt_string, "journal_sectors:%u%c", &val, &dummy) == 1) + journal_sectors = val ? val : 1; + else if (sscanf(opt_string, "interleave_sectors:%u%c", &val, &dummy) == 1) + interleave_sectors = val; + else if (sscanf(opt_string, "buffer_sectors:%u%c", &val, &dummy) == 1) + buffer_sectors = val; + else if (sscanf(opt_string, "journal_watermark:%u%c", &val, &dummy) == 1 && val <= 100) + journal_watermark = val; + else if (sscanf(opt_string, "commit_time:%u%c", &val, &dummy) == 1) + sync_msec = val; + else if (!strncmp(opt_string, "meta_device:", strlen("meta_device:"))) { + if (ic->meta_dev) { + dm_put_device(ti, ic->meta_dev); + ic->meta_dev = NULL; + } + r = dm_get_device(ti, strchr(opt_string, ':') + 1, + dm_table_get_mode(ti->table), &ic->meta_dev); + if (r) { + ti->error = "Device lookup failed"; + goto bad; + } + } else if (sscanf(opt_string, "block_size:%u%c", &val, &dummy) == 1) { + if (val < 1 << SECTOR_SHIFT || + val > MAX_SECTORS_PER_BLOCK << SECTOR_SHIFT || + (val & (val - 1))) { + r = -EINVAL; + ti->error = "Invalid block_size argument"; + goto bad; + } + ic->sectors_per_block = val >> SECTOR_SHIFT; + } else if (sscanf(opt_string, "sectors_per_bit:%llu%c", &llval, &dummy) == 1) { + log2_sectors_per_bitmap_bit = !llval ? 0 : __ilog2_u64(llval); + } else if (sscanf(opt_string, "bitmap_flush_interval:%u%c", &val, &dummy) == 1) { + if (val >= (uint64_t)UINT_MAX * 1000 / HZ) { + r = -EINVAL; + ti->error = "Invalid bitmap_flush_interval argument"; + goto bad; + } + ic->bitmap_flush_interval = msecs_to_jiffies(val); + } else if (!strncmp(opt_string, "internal_hash:", strlen("internal_hash:"))) { + r = get_alg_and_key(opt_string, &ic->internal_hash_alg, &ti->error, + "Invalid internal_hash argument"); + if (r) + goto bad; + } else if (!strncmp(opt_string, "journal_crypt:", strlen("journal_crypt:"))) { + r = get_alg_and_key(opt_string, &ic->journal_crypt_alg, &ti->error, + "Invalid journal_crypt argument"); + if (r) + goto bad; + } else if (!strncmp(opt_string, "journal_mac:", strlen("journal_mac:"))) { + r = get_alg_and_key(opt_string, &ic->journal_mac_alg, &ti->error, + "Invalid journal_mac argument"); + if (r) + goto bad; + } else if (!strcmp(opt_string, "recalculate")) { + ic->recalculate_flag = true; + } else if (!strcmp(opt_string, "reset_recalculate")) { + ic->recalculate_flag = true; + ic->reset_recalculate_flag = true; + } else if (!strcmp(opt_string, "allow_discards")) { + ic->discard = true; + } else if (!strcmp(opt_string, "fix_padding")) { + ic->fix_padding = true; + } else if (!strcmp(opt_string, "fix_hmac")) { + ic->fix_hmac = true; + } else if (!strcmp(opt_string, "legacy_recalculate")) { + ic->legacy_recalculate = true; + } else { + r = -EINVAL; + ti->error = "Invalid argument"; + goto bad; + } + } + + ic->data_device_sectors = bdev_nr_sectors(ic->dev->bdev); + if (!ic->meta_dev) + ic->meta_device_sectors = ic->data_device_sectors; + else + ic->meta_device_sectors = bdev_nr_sectors(ic->meta_dev->bdev); + + if (!journal_sectors) { + journal_sectors = min((sector_t)DEFAULT_MAX_JOURNAL_SECTORS, + ic->data_device_sectors >> DEFAULT_JOURNAL_SIZE_FACTOR); + } + + if (!buffer_sectors) + buffer_sectors = 1; + ic->log2_buffer_sectors = min((int)__fls(buffer_sectors), 31 - SECTOR_SHIFT); + + r = get_mac(&ic->internal_hash, &ic->internal_hash_alg, &ti->error, + "Invalid internal hash", "Error setting internal hash key"); + if (r) + goto bad; + + r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error, + "Invalid journal mac", "Error setting journal mac key"); + if (r) + goto bad; + + if (!ic->tag_size) { + if (!ic->internal_hash) { + ti->error = "Unknown tag size"; + r = -EINVAL; + goto bad; + } + ic->tag_size = crypto_shash_digestsize(ic->internal_hash); + } + if (ic->tag_size > MAX_TAG_SIZE) { + ti->error = "Too big tag size"; + r = -EINVAL; + goto bad; + } + if (!(ic->tag_size & (ic->tag_size - 1))) + ic->log2_tag_size = __ffs(ic->tag_size); + else + ic->log2_tag_size = -1; + + if (ic->mode == 'B' && !ic->internal_hash) { + r = -EINVAL; + ti->error = "Bitmap mode can be only used with internal hash"; + goto bad; + } + + if (ic->discard && !ic->internal_hash) { + r = -EINVAL; + ti->error = "Discard can be only used with internal hash"; + goto bad; + } + + ic->autocommit_jiffies = msecs_to_jiffies(sync_msec); + ic->autocommit_msec = sync_msec; + timer_setup(&ic->autocommit_timer, autocommit_fn, 0); + + ic->io = dm_io_client_create(); + if (IS_ERR(ic->io)) { + r = PTR_ERR(ic->io); + ic->io = NULL; + ti->error = "Cannot allocate dm io"; + goto bad; + } + + r = mempool_init_slab_pool(&ic->journal_io_mempool, JOURNAL_IO_MEMPOOL, journal_io_cache); + if (r) { + ti->error = "Cannot allocate mempool"; + goto bad; + } + + ic->metadata_wq = alloc_workqueue("dm-integrity-metadata", + WQ_MEM_RECLAIM, METADATA_WORKQUEUE_MAX_ACTIVE); + if (!ic->metadata_wq) { + ti->error = "Cannot allocate workqueue"; + r = -ENOMEM; + goto bad; + } + + /* + * If this workqueue weren't ordered, it would cause bio reordering + * and reduced performance. + */ + ic->wait_wq = alloc_ordered_workqueue("dm-integrity-wait", WQ_MEM_RECLAIM); + if (!ic->wait_wq) { + ti->error = "Cannot allocate workqueue"; + r = -ENOMEM; + goto bad; + } + + ic->offload_wq = alloc_workqueue("dm-integrity-offload", WQ_MEM_RECLAIM, + METADATA_WORKQUEUE_MAX_ACTIVE); + if (!ic->offload_wq) { + ti->error = "Cannot allocate workqueue"; + r = -ENOMEM; + goto bad; + } + + ic->commit_wq = alloc_workqueue("dm-integrity-commit", WQ_MEM_RECLAIM, 1); + if (!ic->commit_wq) { + ti->error = "Cannot allocate workqueue"; + r = -ENOMEM; + goto bad; + } + INIT_WORK(&ic->commit_work, integrity_commit); + + if (ic->mode == 'J' || ic->mode == 'B') { + ic->writer_wq = alloc_workqueue("dm-integrity-writer", WQ_MEM_RECLAIM, 1); + if (!ic->writer_wq) { + ti->error = "Cannot allocate workqueue"; + r = -ENOMEM; + goto bad; + } + INIT_WORK(&ic->writer_work, integrity_writer); + } + + ic->sb = alloc_pages_exact(SB_SECTORS << SECTOR_SHIFT, GFP_KERNEL); + if (!ic->sb) { + r = -ENOMEM; + ti->error = "Cannot allocate superblock area"; + goto bad; + } + + r = sync_rw_sb(ic, REQ_OP_READ); + if (r) { + ti->error = "Error reading superblock"; + goto bad; + } + should_write_sb = false; + if (memcmp(ic->sb->magic, SB_MAGIC, 8)) { + if (ic->mode != 'R') { + if (memchr_inv(ic->sb, 0, SB_SECTORS << SECTOR_SHIFT)) { + r = -EINVAL; + ti->error = "The device is not initialized"; + goto bad; + } + } + + r = initialize_superblock(ic, journal_sectors, interleave_sectors); + if (r) { + ti->error = "Could not initialize superblock"; + goto bad; + } + if (ic->mode != 'R') + should_write_sb = true; + } + + if (!ic->sb->version || ic->sb->version > SB_VERSION_5) { + r = -EINVAL; + ti->error = "Unknown version"; + goto bad; + } + if (le16_to_cpu(ic->sb->integrity_tag_size) != ic->tag_size) { + r = -EINVAL; + ti->error = "Tag size doesn't match the information in superblock"; + goto bad; + } + if (ic->sb->log2_sectors_per_block != __ffs(ic->sectors_per_block)) { + r = -EINVAL; + ti->error = "Block size doesn't match the information in superblock"; + goto bad; + } + if (!le32_to_cpu(ic->sb->journal_sections)) { + r = -EINVAL; + ti->error = "Corrupted superblock, journal_sections is 0"; + goto bad; + } + /* make sure that ti->max_io_len doesn't overflow */ + if (!ic->meta_dev) { + if (ic->sb->log2_interleave_sectors < MIN_LOG2_INTERLEAVE_SECTORS || + ic->sb->log2_interleave_sectors > MAX_LOG2_INTERLEAVE_SECTORS) { + r = -EINVAL; + ti->error = "Invalid interleave_sectors in the superblock"; + goto bad; + } + } else { + if (ic->sb->log2_interleave_sectors) { + r = -EINVAL; + ti->error = "Invalid interleave_sectors in the superblock"; + goto bad; + } + } + if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) { + r = -EINVAL; + ti->error = "Journal mac mismatch"; + goto bad; + } + + get_provided_data_sectors(ic); + if (!ic->provided_data_sectors) { + r = -EINVAL; + ti->error = "The device is too small"; + goto bad; + } + +try_smaller_buffer: + r = calculate_device_limits(ic); + if (r) { + if (ic->meta_dev) { + if (ic->log2_buffer_sectors > 3) { + ic->log2_buffer_sectors--; + goto try_smaller_buffer; + } + } + ti->error = "The device is too small"; + goto bad; + } + + if (log2_sectors_per_bitmap_bit < 0) + log2_sectors_per_bitmap_bit = __fls(DEFAULT_SECTORS_PER_BITMAP_BIT); + if (log2_sectors_per_bitmap_bit < ic->sb->log2_sectors_per_block) + log2_sectors_per_bitmap_bit = ic->sb->log2_sectors_per_block; + + bits_in_journal = ((__u64)ic->journal_section_sectors * ic->journal_sections) << (SECTOR_SHIFT + 3); + if (bits_in_journal > UINT_MAX) + bits_in_journal = UINT_MAX; + while (bits_in_journal < (ic->provided_data_sectors + ((sector_t)1 << log2_sectors_per_bitmap_bit) - 1) >> log2_sectors_per_bitmap_bit) + log2_sectors_per_bitmap_bit++; + + log2_blocks_per_bitmap_bit = log2_sectors_per_bitmap_bit - ic->sb->log2_sectors_per_block; + ic->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit; + if (should_write_sb) + ic->sb->log2_blocks_per_bitmap_bit = log2_blocks_per_bitmap_bit; + + n_bitmap_bits = ((ic->provided_data_sectors >> ic->sb->log2_sectors_per_block) + + (((sector_t)1 << log2_blocks_per_bitmap_bit) - 1)) >> log2_blocks_per_bitmap_bit; + ic->n_bitmap_blocks = DIV_ROUND_UP(n_bitmap_bits, BITMAP_BLOCK_SIZE * 8); + + if (!ic->meta_dev) + ic->log2_buffer_sectors = min(ic->log2_buffer_sectors, (__u8)__ffs(ic->metadata_run)); + + if (ti->len > ic->provided_data_sectors) { + r = -EINVAL; + ti->error = "Not enough provided sectors for requested mapping size"; + goto bad; + } + + + threshold = (__u64)ic->journal_entries * (100 - journal_watermark); + threshold += 50; + do_div(threshold, 100); + ic->free_sectors_threshold = threshold; + + DEBUG_print("initialized:\n"); + DEBUG_print(" integrity_tag_size %u\n", le16_to_cpu(ic->sb->integrity_tag_size)); + DEBUG_print(" journal_entry_size %u\n", ic->journal_entry_size); + DEBUG_print(" journal_entries_per_sector %u\n", ic->journal_entries_per_sector); + DEBUG_print(" journal_section_entries %u\n", ic->journal_section_entries); + DEBUG_print(" journal_section_sectors %u\n", ic->journal_section_sectors); + DEBUG_print(" journal_sections %u\n", (unsigned int)le32_to_cpu(ic->sb->journal_sections)); + DEBUG_print(" journal_entries %u\n", ic->journal_entries); + DEBUG_print(" log2_interleave_sectors %d\n", ic->sb->log2_interleave_sectors); + DEBUG_print(" data_device_sectors 0x%llx\n", bdev_nr_sectors(ic->dev->bdev)); + DEBUG_print(" initial_sectors 0x%x\n", ic->initial_sectors); + DEBUG_print(" metadata_run 0x%x\n", ic->metadata_run); + DEBUG_print(" log2_metadata_run %d\n", ic->log2_metadata_run); + DEBUG_print(" provided_data_sectors 0x%llx (%llu)\n", ic->provided_data_sectors, ic->provided_data_sectors); + DEBUG_print(" log2_buffer_sectors %u\n", ic->log2_buffer_sectors); + DEBUG_print(" bits_in_journal %llu\n", bits_in_journal); + + if (ic->recalculate_flag && !(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))) { + ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING); + ic->sb->recalc_sector = cpu_to_le64(0); + } + + if (ic->internal_hash) { + ic->recalc_wq = alloc_workqueue("dm-integrity-recalc", WQ_MEM_RECLAIM, 1); + if (!ic->recalc_wq) { + ti->error = "Cannot allocate workqueue"; + r = -ENOMEM; + goto bad; + } + INIT_WORK(&ic->recalc_work, integrity_recalc); + } else { + if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING)) { + ti->error = "Recalculate can only be specified with internal_hash"; + r = -EINVAL; + goto bad; + } + } + + if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) && + le64_to_cpu(ic->sb->recalc_sector) < ic->provided_data_sectors && + dm_integrity_disable_recalculate(ic)) { + ti->error = "Recalculating with HMAC is disabled for security reasons - if you really need it, use the argument \"legacy_recalculate\""; + r = -EOPNOTSUPP; + goto bad; + } + + ic->bufio = dm_bufio_client_create(ic->meta_dev ? ic->meta_dev->bdev : ic->dev->bdev, + 1U << (SECTOR_SHIFT + ic->log2_buffer_sectors), 1, 0, NULL, NULL, 0); + if (IS_ERR(ic->bufio)) { + r = PTR_ERR(ic->bufio); + ti->error = "Cannot initialize dm-bufio"; + ic->bufio = NULL; + goto bad; + } + dm_bufio_set_sector_offset(ic->bufio, ic->start + ic->initial_sectors); + + if (ic->mode != 'R') { + r = create_journal(ic, &ti->error); + if (r) + goto bad; + + } + + if (ic->mode == 'B') { + unsigned int i; + unsigned int n_bitmap_pages = DIV_ROUND_UP(ic->n_bitmap_blocks, PAGE_SIZE / BITMAP_BLOCK_SIZE); + + ic->recalc_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages); + if (!ic->recalc_bitmap) { + r = -ENOMEM; + goto bad; + } + ic->may_write_bitmap = dm_integrity_alloc_page_list(n_bitmap_pages); + if (!ic->may_write_bitmap) { + r = -ENOMEM; + goto bad; + } + ic->bbs = kvmalloc_array(ic->n_bitmap_blocks, sizeof(struct bitmap_block_status), GFP_KERNEL); + if (!ic->bbs) { + r = -ENOMEM; + goto bad; + } + INIT_DELAYED_WORK(&ic->bitmap_flush_work, bitmap_flush_work); + for (i = 0; i < ic->n_bitmap_blocks; i++) { + struct bitmap_block_status *bbs = &ic->bbs[i]; + unsigned int sector, pl_index, pl_offset; + + INIT_WORK(&bbs->work, bitmap_block_work); + bbs->ic = ic; + bbs->idx = i; + bio_list_init(&bbs->bio_queue); + spin_lock_init(&bbs->bio_queue_lock); + + sector = i * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT); + pl_index = sector >> (PAGE_SHIFT - SECTOR_SHIFT); + pl_offset = (sector << SECTOR_SHIFT) & (PAGE_SIZE - 1); + + bbs->bitmap = lowmem_page_address(ic->journal[pl_index].page) + pl_offset; + } + } + + if (should_write_sb) { + init_journal(ic, 0, ic->journal_sections, 0); + r = dm_integrity_failed(ic); + if (unlikely(r)) { + ti->error = "Error initializing journal"; + goto bad; + } + r = sync_rw_sb(ic, REQ_OP_WRITE | REQ_FUA); + if (r) { + ti->error = "Error initializing superblock"; + goto bad; + } + ic->just_formatted = true; + } + + if (!ic->meta_dev) { + r = dm_set_target_max_io_len(ti, 1U << ic->sb->log2_interleave_sectors); + if (r) + goto bad; + } + if (ic->mode == 'B') { + unsigned int max_io_len; + + max_io_len = ((sector_t)ic->sectors_per_block << ic->log2_blocks_per_bitmap_bit) * (BITMAP_BLOCK_SIZE * 8); + if (!max_io_len) + max_io_len = 1U << 31; + DEBUG_print("max_io_len: old %u, new %u\n", ti->max_io_len, max_io_len); + if (!ti->max_io_len || ti->max_io_len > max_io_len) { + r = dm_set_target_max_io_len(ti, max_io_len); + if (r) + goto bad; + } + } + + if (!ic->internal_hash) + dm_integrity_set(ti, ic); + + ti->num_flush_bios = 1; + ti->flush_supported = true; + if (ic->discard) + ti->num_discard_bios = 1; + + dm_audit_log_ctr(DM_MSG_PREFIX, ti, 1); + return 0; + +bad: + dm_audit_log_ctr(DM_MSG_PREFIX, ti, 0); + dm_integrity_dtr(ti); + return r; +} + +static void dm_integrity_dtr(struct dm_target *ti) +{ + struct dm_integrity_c *ic = ti->private; + + BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress)); + BUG_ON(!list_empty(&ic->wait_list)); + + if (ic->mode == 'B') + cancel_delayed_work_sync(&ic->bitmap_flush_work); + if (ic->metadata_wq) + destroy_workqueue(ic->metadata_wq); + if (ic->wait_wq) + destroy_workqueue(ic->wait_wq); + if (ic->offload_wq) + destroy_workqueue(ic->offload_wq); + if (ic->commit_wq) + destroy_workqueue(ic->commit_wq); + if (ic->writer_wq) + destroy_workqueue(ic->writer_wq); + if (ic->recalc_wq) + destroy_workqueue(ic->recalc_wq); + kvfree(ic->bbs); + if (ic->bufio) + dm_bufio_client_destroy(ic->bufio); + mempool_exit(&ic->journal_io_mempool); + if (ic->io) + dm_io_client_destroy(ic->io); + if (ic->dev) + dm_put_device(ti, ic->dev); + if (ic->meta_dev) + dm_put_device(ti, ic->meta_dev); + dm_integrity_free_page_list(ic->journal); + dm_integrity_free_page_list(ic->journal_io); + dm_integrity_free_page_list(ic->journal_xor); + dm_integrity_free_page_list(ic->recalc_bitmap); + dm_integrity_free_page_list(ic->may_write_bitmap); + if (ic->journal_scatterlist) + dm_integrity_free_journal_scatterlist(ic, ic->journal_scatterlist); + if (ic->journal_io_scatterlist) + dm_integrity_free_journal_scatterlist(ic, ic->journal_io_scatterlist); + if (ic->sk_requests) { + unsigned int i; + + for (i = 0; i < ic->journal_sections; i++) { + struct skcipher_request *req; + + req = ic->sk_requests[i]; + if (req) { + kfree_sensitive(req->iv); + skcipher_request_free(req); + } + } + kvfree(ic->sk_requests); + } + kvfree(ic->journal_tree); + if (ic->sb) + free_pages_exact(ic->sb, SB_SECTORS << SECTOR_SHIFT); + + if (ic->internal_hash) + crypto_free_shash(ic->internal_hash); + free_alg(&ic->internal_hash_alg); + + if (ic->journal_crypt) + crypto_free_skcipher(ic->journal_crypt); + free_alg(&ic->journal_crypt_alg); + + if (ic->journal_mac) + crypto_free_shash(ic->journal_mac); + free_alg(&ic->journal_mac_alg); + + kfree(ic); + dm_audit_log_dtr(DM_MSG_PREFIX, ti, 1); +} + +static struct target_type integrity_target = { + .name = "integrity", + .version = {1, 10, 0}, + .module = THIS_MODULE, + .features = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY, + .ctr = dm_integrity_ctr, + .dtr = dm_integrity_dtr, + .map = dm_integrity_map, + .postsuspend = dm_integrity_postsuspend, + .resume = dm_integrity_resume, + .status = dm_integrity_status, + .iterate_devices = dm_integrity_iterate_devices, + .io_hints = dm_integrity_io_hints, +}; + +static int __init dm_integrity_init(void) +{ + int r; + + journal_io_cache = kmem_cache_create("integrity_journal_io", + sizeof(struct journal_io), 0, 0, NULL); + if (!journal_io_cache) { + DMERR("can't allocate journal io cache"); + return -ENOMEM; + } + + r = dm_register_target(&integrity_target); + if (r < 0) { + kmem_cache_destroy(journal_io_cache); + return r; + } + + return 0; +} + +static void __exit dm_integrity_exit(void) +{ + dm_unregister_target(&integrity_target); + kmem_cache_destroy(journal_io_cache); +} + +module_init(dm_integrity_init); +module_exit(dm_integrity_exit); + +MODULE_AUTHOR("Milan Broz"); +MODULE_AUTHOR("Mikulas Patocka"); +MODULE_DESCRIPTION(DM_NAME " target for integrity tags extension"); +MODULE_LICENSE("GPL"); |