Function Ext2CheckSetBlock

Ext4Fsd/memory.c:1839–1888

}

BOOLEAN
Ext2CheckSetBlock(PEXT2_IRP_CONTEXT IrpContext, PEXT2_VCB Vcb, LONGLONG Block)
{
    PEXT2_GROUP_DESC    gd;
    struct buffer_head *gb = NULL;
    struct buffer_head *bh = NULL;
    ULONG               group, dwBlk, Length;
    RTL_BITMAP          bitmap;
    BOOLEAN             bModified = FALSE;

    group = (ULONG)(Block - EXT2_FIRST_DATA_BLOCK) / BLOCKS_PER_GROUP;
    dwBlk = (ULONG)(Block - EXT2_FIRST_DATA_BLOCK) % BLOCKS_PER_GROUP;

    gd = ext4_get_group_desc(&Vcb->sb, group, &gb);
    if (!gd) {
        return FALSE;
    }
    bh = sb_getblk(&Vcb->sb, ext4_block_bitmap(&Vcb->sb, gd));

    if (group == Vcb->sbi.s_groups_count - 1) {
        Length = (ULONG)(TOTAL_BLOCKS % BLOCKS_PER_GROUP);

        /* s_blocks_count is integer multiple of s_blocks_per_group */
        if (Length == 0)
            Length = BLOCKS_PER_GROUP;
    } else {
        Length = BLOCKS_PER_GROUP;
    }

    if (dwBlk >= Length) {
        fini_bh(&gb);
        fini_bh(&bh);
        return FALSE;
    }


    RtlInitializeBitMap(&bitmap, (PULONG)bh->b_data, Length);

    if (RtlCheckBit(&bitmap, dwBlk) == 0) {
        DbgBreak();
        RtlSetBits(&bitmap, dwBlk, 1);
        bModified = TRUE;
        mark_buffer_dirty(bh);
    }

    fini_bh(&gb);
    fini_bh(&bh);

    return (!bModified);
}

BOOLEAN
Ext2CheckBitmapConsistency(PEXT2_IRP_CONTEXT IrpContext, PEXT2_VCB Vcb)