Function Ext2GetBlock

Ext4Fsd/ext3/indirect.c:135–337

}

NTSTATUS
Ext2GetBlock(
    IN PEXT2_IRP_CONTEXT    IrpContext,
    IN PEXT2_VCB            Vcb,
    IN PEXT2_MCB            Mcb,
    IN ULONG                Base,
    IN ULONG                Layer,
    IN ULONG                Start,
    IN ULONG                SizeArray,
    IN PULONG               BlockArray,
    IN BOOLEAN              bAlloc,
    IN OUT PULONG           Hint,
    OUT PULONG              Block,
    OUT PULONG              Number
)
{
    NTSTATUS    Status = STATUS_SUCCESS;
    PBCB        Bcb = NULL;
    PULONG      pData = NULL;
    ULONG       Slot = 0, i = 0;
    ULONG       Unit = 1;

    LARGE_INTEGER Offset;

    if (Layer == 0) {

        *Number = 1;
        if (BlockArray[0] == 0 && bAlloc) {

            /* now allocate new block */
            Status = Ext2ExpandLast(
                         IrpContext,
                         Vcb,
                         Mcb,
                         Base,
                         Layer,
                         NULL,
                         Hint,
                         &BlockArray[0],
                         Number
                     );

            if (!NT_SUCCESS(Status)) {
                goto errorout;
            }
        } else {
            /* check the block is valid or not */
            if (BlockArray[0] >= TOTAL_BLOCKS) {
                DbgBreak();
                Status = STATUS_DISK_CORRUPT_ERROR;
                goto errorout;
            }
        }

        *Block = BlockArray[0];
        for (i=1; i < SizeArray; i++) {
            if (BlockArray[i] == BlockArray[i-1] + 1) {
                *Number = *Number + 1;