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FS_ALLOCATEPAGESPACE - Adjust the size of paging file

  
Purpose   
Changes the size the paging file on disk. 
Calling Sequence   

int far pascal FS_ALLOCATEPAGESPACE(psffsi, psffsd, ulsize, ulWantContig)

struct sffsi far * psffsi;
struct sffsd far * psffsd;
unsigned long ulsize;
unsigned short ulWantContig;


Where   
psffsi is a pointer to the file-system-independent portion of an open file 
instance. 
psffsd is a pointer to the file-system-dependent portion of an open file 
instance. 
ulsize is the desired new size of the paging file. If the new size is 
smaller than the current size, the excess space is released. If the new 
size is larger than the current size, the requested size is allocated. 
ulWantContig indicates the minimum contiguity requirement (in bytes). 
  
Remarks   
ulWantContig is a demand for contiguity. If ulWantContig is non-zero(0), 
the FSD must allocate any space in the swap file that is not contiguous in 
ulWantContig chunks on ulWantContig boundaries. If it is not possible to 
grow the file to ulSize bytes meeting the ulWantContig requirement, the 
operation should fail . If the file is being shrunk ulWantContig is 
irrelevant and should be ignored . 
FSDs that support the paging I/O interface should be expected to be 
sensible in allocating page space. In particular, they are expected to 
always attempt to allocate space such that ulWantContig sized blocks on 
ulWantContig boundaries are physically contiguous on disk, and to keep the 
page file as a whole contiguous as possible. 

Created using Inf-PHP v.2 (c) 2003 Yuri Prokushev
Created using Inf-HTML v.0.9b (c) 1995 Peter Childs