FSH_CALLDRIVER - Call Device Driver's Extended Strategy entry point

Purpose   

This routine allows FSDs to call a device driver's Extended Strategy entry 
point. 

Calling Sequence   

int far pascal FSH_CALLDRIVER(pPkt, hVPB, fControl)

void far * pPkt;
unsigned short hVPB;
unsigned short fControl;

Where   

pPkt is a pointer to device driver Extended strategy request packet. 

hVPB is the volume handle for the source of I/O. 

fControl is the bit mask of pop-up control actions: 

Bit 0 off indicates volume change pop-up desired 
Bit 0 on indicates no volume change pop-up 

All other bits are reserved and must be zero. 
  

Returns   

If no error is detected, a zero error code is returned. If an error is 
detected, one of the following error codes is returned: 

oERROR_VOLUME_CHANGED 
is an indication that removable media volume change has occurred. 

oERROR_INVALID_PARAMETER 
the fControl flag word has reserved bits on. 
  

Remarks   

This routine should be called for any Extended strategy requests going to 
a drive that has removable media. 

For a detailed description of the Extended Strategy request interface 
please see the OS/2 Version 2.0 Physical Device Driver Reference   

FSH_CALLDRIVER may block. 

Note:   OS/2 does not validate input parameters. Therefore, an FSD should 
call FSH_PROBEBUF where appropriate.