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include blockdev.inc
 
BlockDev_Command_Block  STRUC
BD_CB_Next              dd      ?
BD_CB_Command           dw      ?
BD_CB_Cmd_Status        dw      ?
BD_CB_Flags             dd      ?
BD_CB_Cmd_Cplt_Proc     dd      ?
BD_CB_Sector            dq      ?
BD_CB_Count             dd      ?
BD_CB_Buffer_Ptr        dd      ?
BD_CB_Reserved_Client   dd      ?
BD_CB_Reserved_BlockDev dd      ?
BD_CB_Reserved_FastDisk dd      ?
BlockDev_Command_Block  ENDS
 
The BlockDev_Command_Block structure contains information about a block
device command.
 
Member                   Description
────────────────────────────────────────────────────────────────────────────
 
BD_CB_Next               Points to the next command in the command list.
 
BD_CB_Command            Specifies the command to carry out. It can be one
                         of the following values:
 
                         Value       Meaning
                         ───────────────────────────────────────────────────
                         BDC_Read    Read from device
 
                         BDC_Write   Write to device
 
                         BDC_Verify  Verify read or write
 
                         BDC_Cancel  Cancel command
 
                         Command values in the range 8000h through 0FFFFh
                         are reserved for device-specific commands.
 
BD_CB_Cmd_Status         Specifies the status of the command. It can be one
                         of the following values:
 
                         Value                      Meaning
                         ───────────────────────────────────────────────────
                         BDS_Success                Command completed
                                                    successfully
 
                         BDS_Success_With_Retries   Command completed
                                                    successfully after
                                                    repetition
 
                         BDS_Success_With_ECC       Command completed
                                                    successfully after error
                                                    correction
 
                         BDS_Invalid_Sector_Number  Invalid sector number
 
                         BDS_Canceled               Command was canceled
 
                         BDS_Cmd_In_Progress        Can't cancel command in
                                                    progress
 
                         BDS_Invalid_Cmd_Ptr        Cancel of invalid
                                                    command pointer
 
                         BDS_Media_Error            Read or write failed
 
                         BDS_Device_Error           Device or adapter
                                                    failed
 
                         BDS_Invalid_Command        Invalid command
 
                         All values below BDS_First_Error_Code (10h) imply
                         successful completion; error values are greater
                         than or equal to BDS_First_Error_Code.
 
BD_CB_Flags              Specifies additional actions to take when carrying
                         out the command. This field can be a combination of
                         the following values:
 
                         Value                Meaning
                         ───────────────────────────────────────────────────
                         BDCF_High_Priority   High priority
 
                         BDCF_Scatter_Gather  Scatter or gather
 
                         BDCF_Dont_Cache      Noncached command
 
BD_CB_Cmd_Cplt_Proc      Points to the command-completion callback
                         procedure.
 
BD_CB_Sector             Specifies the count of sectors for the block
                         device.
 
BD_CB_Count              Specifies the count.
 
BD_CB_Buffer_Ptr         Points to the buffer.
 
BD_CB_Reserved_Client    Reserved.
 
BD_CB_Reserved_BlockDev  Reserved.
 
BD_CB_Reserved_FastDisk  Reserved.
 
 
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