rom/dos/addbuffers.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Add or remove cache memory from a filesystem.
   6     Lang: English
   7 */
   8 #include <proto/exec.h>
   9 #include <dos/dosextens.h>
  10 #include <dos/filesystem.h>
  11 #include "dos_intern.h"
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <proto/dos.h>
  17
  18         AROS_LH2(BOOL, AddBuffers,
  19
  20 /*  SYNOPSIS */
  21         AROS_LHA(CONST_STRPTR, devicename, D1),
  22         AROS_LHA(LONG,         numbuffers, D2),
  23
  24 /*  LOCATION */
  25         struct DosLibrary *, DOSBase, 122, Dos)
  26
  27 /*  FUNCTION
  28         Add or remove cache memory from a filesystem.
  29
  30     INPUTS
  31         devicename  --  NUL terminated dos device name.
  32         numbuffers  --  Number of buffers to add. May be negative.
  33
  34     RESULT
  35         != 0 on success (IoErr() gives the actual number of buffers),
  36         0 else (IoErr() gives the error code).
  37
  38     NOTES
  39
  40     EXAMPLE
  41
  42     BUGS
  43
  44     SEE ALSO
  45
  46     INTERNALS
  47
  48     The error value in case of a filesystem error will be reported in
  49     the io_MORE_CACHE.io_NumBuffers field.
  50
  51 *****************************************************************************/
  52
  53 {
  54     AROS_LIBFUNC_INIT
  55     AROS_LIBBASE_EXT_DECL(struct DosLibrary *,DOSBase)
  56
  57     BOOL success = FALSE;
  58
  59     /* Use stackspace for IO request. */
  60     struct IOFileSys iofs;
  61
  62     InitIOFS(&iofs, FSA_MORE_CACHE, DOSBase);
  63
  64     /* Now the specific intialization */
  65
  66     /* Get the device corresponding to 'devicename' */
  67     iofs.IOFS.io_Device = GetDevice(devicename, &iofs.IOFS.io_Unit, DOSBase);
  68
  69     if(iofs.IOFS.io_Device == NULL)
  70         return FALSE;
  71
  72     iofs.io_Union.io_MORE_CACHE.io_NumBuffers = numbuffers;
  73
  74     /* Send the request. */
  75     DosDoIO(&iofs.IOFS);
  76
  77     /* Set error code */
  78     if(iofs.io_DosError == 0)
  79     {
  80         /* IoErr() gives the number of buffers! */
  81         SetIoErr(iofs.io_Union.io_MORE_CACHE.io_NumBuffers);
  82         success = TRUE;
  83     }
  84     else
  85         SetIoErr(iofs.io_DosError);
  86
  87     return success;
  88
  89     AROS_LIBFUNC_EXIT
  90 } /* AddBuffers */