linux-imx

/*

 * 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 <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 <crypto/hash.h>

#include <crypto/skcipher.h>

#include <linux/async_tx.h>

#include <linux/dm-bufio.h>

​

#define DM_MSG_PREFIX "integrity"

​

#define DEFAULT_INTERLEAVE_SECTORS  32768

#define DEFAULT_JOURNAL_SIZE_FACTOR 7

#define DEFAULT_BUFFER_SECTORS      128

#define DEFAULT_JOURNAL_WATERMARK   50

#define DEFAULT_SYNC_MSEC       10000

#define DEFAULT_MAX_JOURNAL_SECTORS 131072

#define MIN_LOG2_INTERLEAVE_SECTORS 3

#define MAX_LOG2_INTERLEAVE_SECTORS 31

#define METADATA_WORKQUEUE_MAX_ACTIVE   16

#define RECALC_SECTORS          8192

#define RECALC_WRITE_SUPER      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_SECTORS          8

#define MAX_SECTORS_PER_BLOCK       8

​

struct superblock {

    __u8 magic[8];

    __u8 version;

    __u8 log2_interleave_sectors;

    __u16 integrity_tag_size;

    __u32 journal_sections;

    __u64 provided_data_sectors;    /* userspace uses this value */

    __u32 flags;

    __u8 log2_sectors_per_block;

    __u8 pad[3];

    __u64 recalc_sector;

};

​

#define SB_FLAG_HAVE_JOURNAL_MAC    0x1

#define SB_FLAG_RECALCULATING       0x2

​

#define JOURNAL_ENTRY_ROUNDUP       8

​

typedef __u64 commit_id_t;

#define JOURNAL_MAC_PER_SECTOR      8

​

struct journal_entry {

    union {

        struct {

            __u32 sector_lo;

            __u32 sector_hi;

        } s;

        __u64 sector;

    } u;

    commit_id_t last_bytes[0];

    /* __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)

#define journal_entry_get_sector(je)        le64_to_cpu((je)->u.sector)

#elif defined(CONFIG_LBDAF)