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git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@485 6ac86273-5f31-0410-b378-82cca8765d1b
63 lines
3.2 KiB
C
63 lines
3.2 KiB
C
/****************************************************************/
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/* */
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/* buffer.h */
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/* */
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/* Sector buffer structure */
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/* */
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/* Copyright (c) 2001 */
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/* Bart Oldeman */
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/* */
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/* Largely taken from globals.h: */
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/* Copyright (c) 1995, 1996 */
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/* Pasquale J. Villani */
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/* All Rights Reserved */
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/* */
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/* This file is part of DOS-C. */
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/* */
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/* DOS-C is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU General Public License */
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/* as published by the Free Software Foundation; either version */
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/* 2, or (at your option) any later version. */
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/* */
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/* DOS-C is distributed in the hope that it will be useful, but */
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/* WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
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/* the GNU General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public */
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/* License along with DOS-C; see the file COPYING. If not, */
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/* write to the Free Software Foundation, 675 Mass Ave, */
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/* Cambridge, MA 02139, USA. */
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/****************************************************************/
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#ifdef MAIN
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#ifdef VERSION_STRINGS
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static BYTE *buffer_hRcsId =
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"$Id$";
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#endif
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#endif
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#define BUFFERSIZE 512
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struct buffer {
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UWORD b_next; /* next buffer in LRU list */
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UWORD b_prev; /* previous buffer in LRU list */
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BYTE b_unit; /* disk for this buffer */
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BYTE b_flag; /* buffer flags */
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ULONG b_blkno; /* block for this buffer */
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UBYTE b_copies; /* number of copies to write */
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UWORD b_offset; /* offset in sectors between copies
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to write for FAT sectors */
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struct dpb FAR *b_dpbp; /* pointer to DPB */
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UWORD b_remotesz; /* size of remote buffer if remote */
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BYTE b_padding;
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UBYTE b_buffer[BUFFERSIZE]; /* 512 byte sectors for now */
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};
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#define BFR_DIRTY 0x40 /* buffer modified */
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#define BFR_VALID 0x20 /* buffer contains valid data */
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#define BFR_DATA 0x08 /* buffer is from data area */
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#define BFR_DIR 0x04 /* buffer is from dir area */
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#define BFR_FAT 0x02 /* buffer is from fat area */
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#define BFR_UNCACHE 0x01 /* buffer to be released ASAP */
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