linux-imx

#include "dm.h"

#include "persistent-data/dm-transaction-manager.h"

#include "persistent-data/dm-bitset.h"

#include "persistent-data/dm-space-map.h"

​

#include <linux/dm-io.h>

#include <linux/dm-kcopyd.h>

#include <linux/init.h>

#include <linux/mempool.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/vmalloc.h>

​

#define DM_MSG_PREFIX "era"

​

#define SUPERBLOCK_LOCATION 0

#define SUPERBLOCK_MAGIC 2126579579

#define SUPERBLOCK_CSUM_XOR 146538381

#define MIN_ERA_VERSION 1

#define MAX_ERA_VERSION 1

#define INVALID_WRITESET_ROOT SUPERBLOCK_LOCATION

#define MIN_BLOCK_SIZE 8

​

/*----------------------------------------------------------------

 * Writeset

 *--------------------------------------------------------------*/

struct writeset_metadata {

    uint32_t nr_bits;

    dm_block_t root;

};

​

struct writeset {

    struct writeset_metadata md;

​

    /*

     * An in core copy of the bits to save constantly doing look ups on

     * disk.

     */

    unsigned long *bits;

};

​

/*

 * This does not free off the on disk bitset as this will normally be done

 * after digesting into the era array.

 */

static void writeset_free(struct writeset *ws)

{

    vfree(ws->bits);

}

​

static int setup_on_disk_bitset(struct dm_disk_bitset *info,

                unsigned nr_bits, dm_block_t *root)

{

    int r;

​

    r = dm_bitset_empty(info, root);

    if (r)

        return r;

​

    return dm_bitset_resize(info, *root, 0, nr_bits, false, root);

}

​

static size_t bitset_size(unsigned nr_bits)