linux-imx

int affs_init_bitmap(struct super_block *sb, int *flags)

{

    struct affs_bm_info *bm;

    struct buffer_head *bmap_bh = NULL, *bh = NULL;

    __be32 *bmap_blk;

    u32 size, blk, end, offset, mask;

    int i, res = 0;

    struct affs_sb_info *sbi = AFFS_SB(sb);

​

        return 0;

​

    if (!AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag) {

        pr_notice("Bitmap invalid - mounting %s read only\n", sb->s_id);

        return 0;

    }

​

    sbi->s_last_bmap = ~0;

    sbi->s_bmap_bh = NULL;

    sbi->s_bmap_bits = sb->s_blocksize * 8 - 32;

    sbi->s_bmap_count = (sbi->s_partition_size - sbi->s_reserved +

                 sbi->s_bmap_bits - 1) / sbi->s_bmap_bits;

    size = sbi->s_bmap_count * sizeof(*bm);

    bm = sbi->s_bitmap = kzalloc(size, GFP_KERNEL);

        bh = affs_bread(sb, bm->bm_key);

        if (!bh) {

            pr_err("Cannot read bitmap\n");

            res = -EIO;

            goto out;

        }

        if (affs_checksum_block(sb, bh)) {

            pr_warn("Bitmap %u invalid - mounting %s read only.\n",

                bm->bm_key, sb->s_id);

            goto out;

        }

        pr_debug("read bitmap block %d: %d\n", blk, bm->bm_key);

        bm->bm_free = memweight(bh->b_data + 4, sb->s_blocksize - 4);

​

        /* Don't try read the extension if this is the last block,

         * but we also need the right bm pointer below

         */

        if (++blk < end || i == 1)

            continue;