Function Ext2TruncateFile

Ext4Fsd/fileinfo.c:1189–1222

NTSTATUS
Ext2TruncateFile(
    PEXT2_IRP_CONTEXT IrpContext,
    PEXT2_VCB         Vcb,
    PEXT2_MCB         Mcb,
    PLARGE_INTEGER    Size
)
{
    NTSTATUS status = STATUS_SUCCESS;

    if (INODE_HAS_EXTENT(&Mcb->Inode)) {
		status = Ext2TruncateExtent(IrpContext, Vcb, Mcb, Size);
    } else {
		status = Ext2TruncateIndirect(IrpContext, Vcb, Mcb, Size);
	}

    /* check and clear data/meta mcb extents */
    if (Size->QuadPart == 0) {

        /* check and remove all data extents */
        if (Ext2ListExtents(&Mcb->Extents)) {
            DbgBreak();
        }
        Ext2ClearAllExtents(&Mcb->Extents);
        /* check and remove all meta extents */
        if (Ext2ListExtents(&Mcb->MetaExts)) {
            DbgBreak();
        }
        Ext2ClearAllExtents(&Mcb->MetaExts);
        ClearLongFlag(Mcb->Flags, MCB_ZONE_INITED);
    }

    return status;
}

NTSTATUS
Ext2IsFileRemovable(