109 lines
3.9 KiB
C
109 lines
3.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2017 by Michael Sevakis
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*
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* This program 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 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef FS_DEFINES_H
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#define FS_DEFINES_H
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/** Tuneable parameters **/
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#if 0
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/* Define this just in case you're doing something that may crash a lot and
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want less write caching */
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#define FS_MIN_WRITECACHING
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#endif
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#ifndef MAX_PATH
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#define MAX_PATH 260
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#endif
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#define MAX_COMPNAME 260
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/* still experimental? */
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/* increasing this will increase the total memory used by the cache; the
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cache, as noted in disk_cache.h, has other minimum requirements that may
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prevent reducing its number of entries in order to compensate */
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#ifndef SECTOR_SIZE
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#define SECTOR_SIZE 512
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#endif
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/* limits for number of open descriptors - if you increase these values, make
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certain that the disk cache has enough available buffers */
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#define MAX_OPEN_FILES 11
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#define MAX_OPEN_DIRS 12
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/* internal functions open streams as well; make sure they don't fail if all
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user descs are busy; this needs to be at least the greatest quantity needed
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at once by all internal functions */
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#ifdef HAVE_DIRCACHE
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#define AUX_FILEOBJS 3
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#else
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#define AUX_FILEOBJS 2
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#endif
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/* number of components statically allocated to handle the vast majority
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of path depths; should maybe be tuned for >= 90th percentile but for now,
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imma just guessing based on something like:
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root + 'Music' + 'Artist' + 'Album' + 'Disc N' + filename */
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#define STATIC_PATHCOMP_NUM 6
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/* unsigned value that will also hold the off_t range we need without
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overflow */
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#define file_size_t uint32_t
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#ifdef __USE_FILE_OFFSET64
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/* if we want, we can deal with files up to 2^32-1 bytes-- the full FAT16/32
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range */
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#define FILE_SIZE_MAX (0xffffffffu)
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#else
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/* file contents and size will be preserved by the APIs so long as ftruncate()
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isn't used; bytes passed 2^31-1 will not accessible nor will writes succeed
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that would extend the file beyond the max for a 32-bit off_t */
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#define FILE_SIZE_MAX (0x7fffffffu)
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#endif
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/* if file is "large(ish)", then get rid of the contents now rather than
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lazily when the file is synced or closed in order to free-up space */
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#define O_TRUNC_THRESH 65536
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/* This needs enough for all file handles to have a buffer in the worst case
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* plus at least one reserved exclusively for the cache client and a couple
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* for other file system code. The buffers are put to use by the cache if not
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* taken for another purpose (meaning nothing is wasted sitting fallow).
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*
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* One map per volume is maintained in order to avoid collisions between
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* volumes that would slow cache probing. IOC_MAP_NUM_ENTRIES is the number
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* for each map per volume. The buffers themselves are shared.
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*/
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#if MEMORYSIZE < 8
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#define DC_NUM_ENTRIES 32
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#define DC_MAP_NUM_ENTRIES 128
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#elif MEMORYSIZE <= 32
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#define DC_NUM_ENTRIES 48
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#define DC_MAP_NUM_ENTRIES 128
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#else /* MEMORYSIZE > 32 */
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#define DC_NUM_ENTRIES 64
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#define DC_MAP_NUM_ENTRIES 256
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#endif /* MEMORYSIZE */
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/* this _could_ be larger than a sector if that would ever be useful */
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#define DC_CACHE_BUFSIZE SECTOR_SIZE
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#endif /* FS_DEFINES_H */
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