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-rw-r--r--drivers/md/dm-integrity.c4719
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 *)&section_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, &section_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 *)&sector_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 = &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, &section_node[j])) {
+ struct journal_entry *je2 = access_journal_entry(ic, i, j);
+
+ journal_entry_set_unused(je2);
+ remove_journal_node(ic, &section_node[j]);
+ j++;
+ sec += ic->sectors_per_block;
+ offset += ic->sectors_per_block;
+ }
+ while (j < k && find_newer_committed_node(ic, &section_node[k - 1])) {
+ struct journal_entry *je2 = access_journal_entry(ic, i, k - 1);
+
+ journal_entry_set_unused(je2);
+ remove_journal_node(ic, &section_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, &section_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, &section_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");