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Diffstat (limited to 'nuttx/fs/fat/fs_configfat.c')
| -rw-r--r-- | nuttx/fs/fat/fs_configfat.c | 963 |
1 files changed, 0 insertions, 963 deletions
diff --git a/nuttx/fs/fat/fs_configfat.c b/nuttx/fs/fat/fs_configfat.c deleted file mode 100644 index 04141ee2b..000000000 --- a/nuttx/fs/fat/fs_configfat.c +++ /dev/null @@ -1,963 +0,0 @@ -/**************************************************************************** - * fs/fat/fs_configfat.c - * - * Copyright (C) 2008-2009 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <stdint.h> -#include <string.h> -#include <debug.h> -#include <errno.h> - -#include <nuttx/fs/fs.h> -#include <nuttx/fs/fat.h> -#include <nuttx/fs/mkfatfs.h> - -#include "fs_internal.h" -#include "fs_fat32.h" -#include "fs_mkfatfs.h" - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -#define NDX12 0 -#define NDX16 1 -#define NDX32 2 - -#define fatconfig12 fatconfig[NDX12] -#define fatconfig16 fatconfig[NDX16] -#define fatconfig32 fatconfig[NDX32] - -/* JMP rel8 and NOP opcodes */ - -#define OPCODE_JMP_REL8 0xeb -#define OPCODE_NOP 0x90 - -#define BOOTCODE_MSGOFFSET 29 - -/**************************************************************************** - * Private Types - ****************************************************************************/ - -struct fat_config_s -{ - uint32_t fc_navailsects; /* The number of available sectors */ - uint32_t fc_nfatsects; /* The number of sectors in one FAT */ - uint32_t fc_nclusters; /* The number of clusters in the filesystem */ - uint32_t fc_rsvdseccount; /* The number of reserved sectors */ -}; - -/**************************************************************************** - * Private Data - ****************************************************************************/ - -/* Reverse engineered, generic boot message logic for non-bootable disk. - * Message begins at offset 29; Sector relative offset must be poked into - * offset 3. - */ - -static uint8_t g_bootcodeblob[] = -{ - 0x0e, 0x1f, 0xbe, 0x00, 0x7c, 0xac, 0x22, 0xc0, 0x74, 0x0b, 0x56, - 0xb4, 0x0e, 0xbb, 0x07, 0x00, 0xcd, 0x10, 0x5e, 0xeb, 0xf0, 0x32, - 0xe4, 0xcd, 0x16, 0xcd, 0x19, 0xeb, 0xfe, 0x54, 0x68, 0x69, 0x73, - 0x20, 0x69, 0x73, 0x20, 0x6e, 0x6f, 0x74, 0x20, 0x61, 0x20, 0x62, - 0x6f, 0x6f, 0x74, 0x61, 0x62, 0x6c, 0x65, 0x20, 0x64, 0x69, 0x73, - 0x6b, 0x2e, 0x20, 0x20, 0x50, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x20, - 0x69, 0x6e, 0x73, 0x65, 0x72, 0x74, 0x20, 0x61, 0x20, 0x62, 0x6f, - 0x6f, 0x74, 0x61, 0x62, 0x6c, 0x65, 0x20, 0x66, 0x6c, 0x6f, 0x70, - 0x70, 0x79, 0x20, 0x61, 0x6e, 0x64, 0x0d, 0x0a, 0x70, 0x72, 0x65, - 0x73, 0x73, 0x20, 0x61, 0x6e, 0x79, 0x20, 0x6b, 0x65, 0x79, 0x20, - 0x74, 0x6f, 0x20, 0x74, 0x72, 0x79, 0x20, 0x61, 0x67, 0x61, 0x69, - 0x6e, 0x20, 0x2e, 0x2e, 0x2e, 0x0d, 0x0a, 0x00 -}; - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: mkfatfs_nfatsect12 - * - * Description: - * Calculate the number of sectors need for one fat in a FAT12 file system. - * - * Input: - * fmt - Caller specified format parameters - * var - Other format parameters that are not caller specifiable. (Most - * set by mkfatfs_configfatfs()). - * navailsects - The number of sectors available for both FAT and data. - * This is a precalculated value equal to the total number of sectors - * minus the number of root directory sectors and minus the number of - * reserved sectors. - * - * Return: - * 0: That calculation would have overflowed - * >0: The size of one FAT in sectors. - * - ****************************************************************************/ -static inline uint32_t -mkfatfs_nfatsect12(FAR struct fat_format_s *fmt, FAR struct fat_var_s *var, - uint32_t navailsects) -{ -#ifdef CONFIG_HAVE_LONG_LONG - uint64_t denom; - uint64_t numer; -#else - uint32_t denom; - uint32_t numer; -#endif - - /* For FAT12, the cluster number is held in a 12-bit number or 1.5 bytes per - * cluster reference. So each FAT sector will hold sectorsize/1.5 cluster - * references (except for the first sector of each FAT which has two reserved - * 12-bit values). And the total number of FAT sectors needed is: - * - * nfatsects = (1.5 * (ndataclust + 2) / sectorsize) - * - * where: - * - * ndataclust = ndatasect / clustsize - * nvailsects = nfatsects + ndatasect - * - * The solution to this set of linear equations is: - * - * nfatsects = (3 * navailsects + 6 * clustersize) / - * (3 * nfats + 2 * sectorsize * clustersize) - * - * The numerator would overflow uint32_t if: - * - * 3 * navailsects + 6 * clustersize > 0xffffffff - * - * Or - * - * navailsects > 0x55555555 - 2 * clustersize - */ - -#ifndef CONFIG_HAVE_LONG_LONG - if (navailsects <= (0x55555555 - (1 << (fmt->ff_clustshift + 1)))) - { -#endif - - denom = (fmt->ff_nfats << 1) + fmt->ff_nfats - + (var->fv_sectorsize << (fmt->ff_clustshift + 1)); - numer = (navailsects << 1) + navailsects - + (1 << (fmt->ff_clustshift + 2)) + (1 << (fmt->ff_clustshift + 1)); - return (uint32_t)((numer + denom - 1) / denom); - -#ifndef CONFIG_HAVE_LONG_LONG - } - else - { - return 0; - } -#endif -} - -/**************************************************************************** - * Name: mkfatfs_nfatsect16 - * - * Description: - * Calculate the number of sectors need for one fat in a FAT16 file system. - * - * Input: - * fmt - Caller specified format parameters - * var - Other format parameters that are not caller specifiable. (Most - * set by mkfatfs_configfatfs()). - * navailsects - The number of sectors available for both FAT and data. - * This is a precalculated value equal to the total number of sectors - * minus the number of root directory sectors and minus the number of - * reserved sectors. - * - * Return: - * The size of one FAT in sectors. - * - ****************************************************************************/ -static inline uint32_t -mkfatfs_nfatsect16(FAR struct fat_format_s *fmt, FAR struct fat_var_s *var, - uint32_t navailsects) -{ -#ifdef CONFIG_HAVE_LONG_LONG - uint64_t denom; - uint64_t numer; -#else - uint32_t denom; - uint32_t numer; -#endif - - /* For FAT16, the cluster number is held in a 16-bit number or 2 bytes per - * cluster reference. So each FAT sector will hold sectorsize/2 cluster - * references (except for the first sector of each FAT which has two reserved - * 16-bit values). And the total number of FAT sectors needed is: - * - * nfatsects = (2 * (ndataclust + 2) / sectorsize) - * - * where: - * - * ndataclust = ndatasect / clustsize - * nvailsects = nfatsects + ndatasect - * - * The solution to this set of linear equations is: - * - * nfatsects = (navailsects + 2 * clustersize) / - * (nfats + sectorsize * clustersize / 2) - * - * Overflow in the calculation of the numerator could occur if: - * - * navailsects > 0xffffffff - 2 * clustersize - */ - - if (fmt->ff_clustshift == 0) - { - denom = fmt->ff_nfats + (var->fv_sectorsize >> 1); - numer = navailsects + 2; - } - else - { - denom = fmt->ff_nfats + (var->fv_sectorsize << (fmt->ff_clustshift - 1)); - numer = navailsects + (1 << (fmt->ff_clustshift + 1)); - } - return (uint32_t)((numer + denom - 1) / denom); -} - -/**************************************************************************** - * Name: mkfatfs_nfatsect32 - * - * Description: - * Calculate the number of sectors need for one fat in a FAT32 file system. - * - * Input: - * fmt - Caller specified format parameters - * var - Other format parameters that are not caller specifiable. (Most - * set by mkfatfs_configfatfs()). - * navailsects - The number of sectors available for both FAT and data. - * This is a precalculated value equal to the total number of sectors - * minus the number of root directory sectors and minus the number of - * reserved sectors. - * - * Return: - * The size of one FAT in sectors. - * - ****************************************************************************/ -static inline uint32_t -mkfatfs_nfatsect32(FAR struct fat_format_s *fmt, FAR struct fat_var_s *var, - uint32_t navailsects) -{ -#ifdef CONFIG_HAVE_LONG_LONG - uint64_t denom; - uint64_t numer; -#else - uint32_t denom; - uint32_t numer; -#endif - - /* For FAT32, the cluster number is held in a 32-bit number or 4 bytes per - * cluster reference. So each FAT sector will hold sectorsize/4 cluster - * references (except for the first sector of each FAT which has three reserved - * 32-bit values). And the total number of FAT sectors needed is: - * - * nfatsects = (4 * (ndataclust + 3) / sectorsize) - * - * where: - * - * ndataclust = ndatasect / clustsize - * nvailsects = nfatsects + ndatasect - * - * The solution to this set of linear equations is: - * - * nfatsects = (navailsects + 3 * clustersize) / - * (nfats + sectorsize * clustersize / 4) - * - * Overflow in the 32-bit calculation of the numerator could occur if: - * - * navailsects > 0xffffffff - 3 * clustersize - */ - - if (fmt->ff_clustshift == 0) - { - denom = fmt->ff_nfats + (var->fv_sectorsize >> 2); - numer = navailsects + 3; - } - else if (fmt->ff_clustshift == 1) - { - denom = fmt->ff_nfats + (var->fv_sectorsize >> 1); - numer = navailsects + 6; - } - else - { - denom = fmt->ff_nfats + (var->fv_sectorsize << (fmt->ff_clustshift - 2)); - numer = navailsects + (1 << (fmt->ff_clustshift + 1)) + (1 << fmt->ff_clustshift); - } - return (uint32_t)((numer + denom - 1) / denom); -} - -/**************************************************************************** - * Name: mkfatfs_clustersearchlimits - * - * Description: - * Pick the starting and ending cluster size to use in the search for the - * the optimal cluster size. - * - * Input: - * fmt - Caller specified format parameters - * var - Other format parameters that are not caller specifiable. (Most - * set by mkfatfs_configfatfs()). - * - * Return: - * Starting cluster size is set in fmt->ff_clustshift; Final cluster - * size is the returned value. - * - ****************************************************************************/ -static inline uint8_t -mkfatfs_clustersearchlimits(FAR struct fat_format_s *fmt, FAR struct fat_var_s *var) -{ - uint8_t mxclustshift; - - /* Did the caller already pick the cluster size? If not, the clustshift value - * will be 0xff - */ - - if (fmt->ff_clustshift == 0xff) - { - /* Pick a starting size based on the number of sectors on the device */ - - if (fmt->ff_nsectors < 2048) - { - /* 2k sectors, start wit 1 sector/cluster. */ - fmt->ff_clustshift = 0; - } - else if (fmt->ff_nsectors < 4096) - { - /* 4k sectors, start with 2 sector/cluster. */ - fmt->ff_clustshift = 1; - } - else if (fmt->ff_nsectors < 8192) - { - /* 8k sectors, start with 4 sector/cluster. */ - fmt->ff_clustshift = 2; - } - else if (fmt->ff_nsectors < 16384) - { - /* 16k sectors, start with 8 sector/cluster. */ - fmt->ff_clustshift = 3; - } - else if (fmt->ff_nsectors < 32768) - { - /* 32k sectors, start with 16 sector/cluster. */ - fmt->ff_clustshift = 4; - } - else - { - /* Otherwise, 32 sector/cluster. */ - fmt->ff_clustshift = 5; - } - - /* Wherever the search starts, it will end with the maximum of - * 128 sectors per cluster - */ - - mxclustshift = 7; - } - else - { - /* The caller has selected a cluster size. There will be no search! - * Just set the maximum to the caller specificed value. - */ - - mxclustshift = fmt->ff_clustshift; - } - return mxclustshift; -} - -/**************************************************************************** - * Name: mkfatfs_tryfat12 - * - * Description: - * Try to define a FAT12 filesystem on the device using the candidate - * sectors per cluster - * - * Input: - * fmt - Caller specified format parameters - * var - Other format parameters that are not caller specifiable. (Most - * set by mkfatfs_configfatfs()). - * fatconfig - FAT12-specific configuration - * - * Return: - * Zero on success configuration of a FAT12 file system; negated errno - * on failure - * - ****************************************************************************/ -static inline int -mkfatfs_tryfat12(FAR struct fat_format_s *fmt, FAR struct fat_var_s *var, - FAR struct fat_config_s *config) -{ - uint32_t maxnclusters; - - /* Calculate the number sectors in one FAT required to access all of the - * available sectors. - */ - - config->fc_nfatsects = mkfatfs_nfatsect12(fmt, var, config->fc_navailsects); - if (config->fc_nfatsects > 0) - { - /* Calculate the number of clusters available given the number of available - * sectors and the number of those that will be used for FAT: - */ - - config->fc_nclusters = - (config->fc_navailsects - - fmt->ff_nfats * config->fc_nfatsects) >> fmt->ff_clustshift; - - /* Calculate the maximum number of clusters that could be supported by a - * FAT of this size. - * - * maxnclusters = nfatsects * sectorsize / 1.5 - 2 - */ - - maxnclusters = (config->fc_nfatsects >> (var->fv_sectshift + 1)) / 3; - if (maxnclusters > FAT_MAXCLUST12) - { - maxnclusters = FAT_MAXCLUST12; - } - fvdbg("nfatsects=%u nclusters=%u (max=%u)\n", - config->fc_nfatsects, config->fc_nclusters, maxnclusters); - - /* Check if this number of clusters would overflow the maximum for - * FAT12 (remembering that two FAT cluster slots are reserved). - */ - - if (config->fc_nclusters + 2 > maxnclusters) - { - fvdbg("Too many clusters for FAT12\n"); - return -ENFILE; - } - } - return 0; -} - -/**************************************************************************** - * Name: mkfatfs_tryfat16 - * - * Description: - * Try to define a FAT16 filesystem on the device using the candidate - * sectors per cluster - * - * Input: - * fmt - Caller specified format parameters - * var - Other format parameters that are not caller specifiable. (Most - * set by mkfatfs_configfatfs()). - * fatconfig - FAT16-specific configuration - * - * Return: - * Zero on success configuration of a FAT16 file system; negated errno - * on failure - * - ****************************************************************************/ -static inline int -mkfatfs_tryfat16(FAR struct fat_format_s *fmt, FAR struct fat_var_s *var, - FAR struct fat_config_s *config) -{ - uint32_t maxnclusters; - - /* Calculate the number sectors in one FAT required to access all of the - * available sectors. - */ - - config->fc_nfatsects = mkfatfs_nfatsect16(fmt, var, config->fc_navailsects); - if (config->fc_nfatsects > 0) - { - /* Calculate the number of clusters available given the number of available - * sectors and the number of those that will be used for FAT: - */ - - config->fc_nclusters = - (config->fc_navailsects - - fmt->ff_nfats * config->fc_nfatsects) >> fmt->ff_clustshift; - - /* Calculate the maximum number of clusters that could be supported by a - * FAT of this size. - * - * maxnclusters = nfatsects * sectorsize / 2 - 2 - */ - - maxnclusters = config->fc_nfatsects << (var->fv_sectorsize - 1); - if (maxnclusters > FAT_MAXCLUST16) - { - maxnclusters = FAT_MAXCLUST16; - } - fvdbg("nfatsects=%u nclusters=%u (min=%u max=%u)\n", - config->fc_nfatsects, config->fc_nclusters, FAT_MINCLUST16, maxnclusters); - - /* Check if this number of clusters would overflow the maximum for - * FAT16 (remembering that two FAT cluster slots are reserved). - * Check the lower limit as well. The FAT12 is distinguished from FAT16 - * by comparing the number of clusters on the device agains a known - * threshold. If a small FAT16 file system were created, then it would - * be confused as a FAT12 at mount time. - */ - - if ((config->fc_nclusters + 2 > maxnclusters) || - (config->fc_nclusters < FAT_MINCLUST16)) - { - fvdbg("Too few or too many clusters for FAT16\n"); - return -ENFILE; - } - } - return 0; -} - -/**************************************************************************** - * Name: mkfatfs_tryfat32 - * - * Description: - * Try to define a FAT32 filesystem on the device using the candidate - * sectors per cluster - * - * Input: - * fmt - Caller specified format parameters - * var - Other format parameters that are not caller specifiable. (Most - * set by mkfatfs_configfatfs()). - * fatconfig - FAT32-specific configuration - * - * Return: - * Zero on success configuration of a FAT32 file system; negated errno - * on failure - * - ****************************************************************************/ -static inline int -mkfatfs_tryfat32(FAR struct fat_format_s *fmt, FAR struct fat_var_s *var, - FAR struct fat_config_s *config) -{ - uint32_t maxnclusters; - - /* Calculate the number sectors in one FAT required to access all of the - * available sectors. - */ - - config->fc_nfatsects = mkfatfs_nfatsect32(fmt, var, config->fc_navailsects); - if (config->fc_nfatsects > 0) - { - /* Calculate the number of clusters available given the number of available - * sectors and the number of those that will be used for FAT: - */ - - config->fc_nclusters = - (config->fc_navailsects - - fmt->ff_nfats * config->fc_nfatsects) >> fmt->ff_clustshift; - - /* Calculate the maximum number of clusters that could be supported by a - * FAT of this size. - * - * maxnclusters = nfatsects * sectorsize / 4 - 2 - */ - - maxnclusters = (config->fc_nfatsects << (var->fv_sectshift - 2)); - if (maxnclusters > FAT_MAXCLUST32) - { - maxnclusters = FAT_MAXCLUST32; - } - fvdbg("nfatsects=%u nclusters=%u (max=%u)\n", - config->fc_nfatsects, config->fc_nclusters, maxnclusters); - - /* Check if this number of clusters would overflow the maximum for - * FAT32 (remembering that two FAT cluster slots are reserved). - */ - - if ((config->fc_nclusters + 3 > maxnclusters) || - (config->fc_nclusters < FAT_MINCLUST32 && fmt->ff_fattype != 32)) - { - fvdbg("Too few or too many clusters for FAT32\n"); - return -ENFILE; - } - } - return 0; -} - -/**************************************************************************** - * Name: mkfatfs_selectfat - * - * Description: - * The cluster search has succeeded, select the specified FAT FS - * - * Input: - * fattype - The FAT size selected - * fmt - Caller specified format parameters - * var - Format parameters that are not caller specifiable. - * - * Return: - * None - * - ****************************************************************************/ - -static inline void -mkfatfs_selectfat(int fattype, FAR struct fat_format_s *fmt, - FAR struct fat_var_s *var, FAR struct fat_config_s *config) -{ - /* Return the appropriate information about the selected file system. */ - - fdbg("Selected FAT%d\n", fattype); - var->fv_fattype = fattype; - var->fv_nclusters = config->fc_nclusters; - var->fv_nfatsects = config->fc_nfatsects; - fmt->ff_rsvdseccount = config->fc_rsvdseccount; -} - -/**************************************************************************** - * Name: mkfatfs_clustersearch - * - * Description: - * Search to find the smallest (reasonable) cluster size for the FAT file - * system. - * - * Input: - * fmt - Caller specified format parameters - * var - Other format parameters that are not caller specifiable. (Most - * set by mkfatfs_configfatfs()). - * - * Return: - * Zero on success; negated errno on failure - * - ****************************************************************************/ - -static inline int -mkfatfs_clustersearch(FAR struct fat_format_s *fmt, FAR struct fat_var_s *var) -{ - struct fat_config_s fatconfig[3]; - uint8_t mxclustshift; - - memset(fatconfig, 0, 3*sizeof(struct fat_config_s)); - - /* Select the reserved sector count for each FAT size */ - - if (fmt->ff_rsvdseccount) - { - fatconfig12.fc_rsvdseccount = fmt->ff_rsvdseccount; - fatconfig16.fc_rsvdseccount = fmt->ff_rsvdseccount; - - if (fmt->ff_rsvdseccount < 2) - { - fvdbg("At least 2 reserved sectors needed by FAT32\n"); - fatconfig32.fc_rsvdseccount = 2; - } - else - { - fatconfig32.fc_rsvdseccount = fmt->ff_rsvdseccount; - } - } - else - { - fatconfig12.fc_rsvdseccount = 1; - fatconfig16.fc_rsvdseccount = 1; - fatconfig32.fc_rsvdseccount = 32; - } - - /* Determine the number of sectors needed by the root directory. - * This is a constant value, independent of cluster size for FAT12/16 - */ - - if (var->fv_fattype != 32) - { - /* Calculate the number of sectors reqired to contain the selected - * number of root directory entries. This value is save in the var - * structure but will be overwritten if FAT32 is selected. FAT32 uses - * a cluster chain for the root directory, so the concept of the number - * of root directory entries does not apply to FAT32 - */ - - var->fv_nrootdirsects = - ((fmt->ff_rootdirentries << DIR_SHIFT) + var->fv_sectorsize - 1) >> var->fv_sectshift; - - /* The number of data sectors available (includes the fat itself) - * This value is a constant for FAT12/16, but not FAT32 because the - * size of the root directory cluster changes - */ - - fatconfig12.fc_navailsects = - fatconfig16.fc_navailsects = - fmt->ff_nsectors - var->fv_nrootdirsects - fatconfig12.fc_rsvdseccount; - } - - /* Select an initial and terminal clustersize to use in the search (if these - * values were not provided by the caller) - */ - - mxclustshift = mkfatfs_clustersearchlimits(fmt, var); - - do - { - fvdbg("Configuring with %d sectors/cluster...\n", 1 << fmt->ff_clustshift); - - /* Check if FAT12 has not been excluded */ - - if (var->fv_fattype == 0 || var->fv_fattype == 12) - { - /* Try to configure a FAT12 filesystem with this cluster size */ - - if (mkfatfs_tryfat12(fmt, var, &fatconfig12) != 0) - { - { - fvdbg("Cannot format FAT12 at %u sectors/cluster\n", 1 << fmt->ff_clustshift); - fatconfig12.fc_nfatsects = 0; - fatconfig12.fc_nclusters = 0; - } - } - } - - /* Check if FAT16 has not been excluded */ - - if (var->fv_fattype == 0 || var->fv_fattype == 16) - { - /* Try to configure a FAT16 filesystem with this cluster size */ - - if (mkfatfs_tryfat16(fmt, var, &fatconfig16) != 0) - { - { - fvdbg("Cannot format FAT16 at %u sectors/cluster\n", 1 << fmt->ff_clustshift); - fatconfig16.fc_nfatsects = 0; - fatconfig16.fc_nclusters = 0; - } - } - } - - /* If either FAT12 or 16 was configured at this sector/cluster setting, - * then finish the configuration and break out now - */ - - if (fatconfig12.fc_nclusters || fatconfig16.fc_nclusters) - { - if ((!var->fv_fattype && fatconfig16.fc_nclusters > fatconfig12.fc_nclusters) || - (var ->fv_fattype == 16)) - { - /* The caller has selected FAT16 -OR- no FAT type has been selected, but - * the FAT16 selection has more clusters. Select FAT16. - */ - - mkfatfs_selectfat(16, fmt, var, &fatconfig16); - } - else - { - /* The caller has selected FAT12 -OR- no FAT type has been selected, but - * the FAT12 selected has more clusters. Selected FAT12 - */ - - mkfatfs_selectfat(12, fmt, var, &fatconfig12); - } - return OK; - } - - /* Check if FAT32 has not been excluded */ - - if (var->fv_fattype == 0 || var->fv_fattype == 32) - { - /* The number of data sectors available (includes the fat itself) - * This value is a constant with respect to cluster sizefor FAT12/16, but not FAT32 - * because the size of the root directory cluster changes with cluster size. - */ - - fatconfig32.fc_navailsects = fmt->ff_nsectors - (1 << fmt->ff_clustshift) - fatconfig32.fc_rsvdseccount; - - /* Try to configure a FAT32 filesystem with this cluster size */ - - if (mkfatfs_tryfat32(fmt, var, &fatconfig32) != 0) - { - { - fvdbg("Cannot format FAT32 at %u sectors/cluster\n", 1 << fmt->ff_clustshift); - fatconfig32.fc_nfatsects = 0; - fatconfig32.fc_nclusters = 0; - } - } - else - { - /* Select FAT32 if we have not already done so */ - - mkfatfs_selectfat(32, fmt, var, &fatconfig32); - return OK; - } - } - - /* Otherwise, bump up the sectors/cluster for the next time around the loop. */ - - fmt->ff_clustshift++; - } - while (fmt->ff_clustshift <= mxclustshift); - return -ENFILE; -} - -/**************************************************************************** - * Global Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: mkfatfs_configfatfs - * - * Description: - * Based on the geometry of the block device and upon the caller-selected - * values, configure the FAT filesystem for the device. - * - * Input: - * fmt - Caller specified format parameters - * var - Holds disk geomtry data. Also, the location to return FAT - * configuration data - * - * Return: - * Zero on success; negated errno on failure - * - ****************************************************************************/ -int mkfatfs_configfatfs(FAR struct fat_format_s *fmt, - FAR struct fat_var_s *var) -{ - int ret; - - /* Select the number of root directory entries (FAT12/16 only). If FAT32 is selected, - * this value will be cleared later - */ - - if (!fmt->ff_rootdirentries) - { - /* The caller did not specify the number of root directory entries; use a default of 512. */ - - fmt->ff_rootdirentries = 512; - } - - /* Search to determine the smallest (reasonable) cluster size. A by-product - * of this search will be the selection of the FAT size (12/16/32) if the - * caller has not specified the FAT size - */ - - ret = mkfatfs_clustersearch(fmt, var); - if (ret < 0) - { - fdbg("Failed to set cluster size\n"); - return ret; - } - - /* Perform FAT specific initialization */ - - /* Set up boot jump assuming FAT 12/16 offset to bootcode */ - - var->fv_jump[0] = OPCODE_JMP_REL8; - var->fv_jump[2] = OPCODE_NOP; - var->fv_bootcode = g_bootcodeblob; - var->fv_bootcodesize = sizeof(g_bootcodeblob); - - if (var->fv_fattype != 32) - { - /* Set up additional, non-zero FAT12/16 fields */ - - /* Patch in the correct offset to the boot code */ - - var->fv_jump[1] = BS16_BOOTCODE - 2; - g_bootcodeblob[3] = BS16_BOOTCODE + BOOTCODE_MSGOFFSET; - } - else - { - /* Patch in the correct offset to the boot code */ - - var->fv_jump[1] = BS32_BOOTCODE - 2; - g_bootcodeblob[3] = BS32_BOOTCODE + BOOTCODE_MSGOFFSET; - - /* The root directory is a cluster chain... its is initialize size is one cluster */ - - var->fv_nrootdirsects = 1 << fmt->ff_clustshift; - - /* The number of reported root directory entries should should be zero for - * FAT32 because the root directory is a cluster chain. - */ - - fmt->ff_rootdirentries = 0; - - /* Verify the caller's backupboot selection */ - - if (fmt->ff_backupboot <= 1 || fmt->ff_backupboot >= fmt->ff_rsvdseccount) - { - fdbg("Invalid backup boot sector: %d\n", fmt->ff_backupboot); - fmt->ff_backupboot = 0; - } - - /* Check if the caller has selected a location for the backup boot record */ - - if (!fmt->ff_backupboot) - { - /* There must be reserved sectors in order to have a backup boot sector */ - - if (fmt->ff_rsvdseccount > 0 && fmt->ff_rsvdseccount >= 2) - { - /* Sector 0 is the MBR; 1... ff_rsvdseccount are reserved. Try the next - * the last reserved sector. - */ - - fmt->ff_backupboot = fmt->ff_rsvdseccount - 1; - if (fmt->ff_backupboot > 6) - { - /* Limit the location to within the first 7 */ - - fmt->ff_backupboot = 6; - } - } - } - } - - /* Report the selected fat type */ - - fmt->ff_fattype = var->fv_fattype; - - /* Describe the configured filesystem */ - -#ifdef CONFIG_DEBUG - fdbg("Sector size: %d bytes\n", var->fv_sectorsize); - fdbg("Number of sectors: %d sectors\n", fmt->ff_nsectors); - fdbg("FAT size: %d bits\n", var->fv_fattype); - fdbg("Number FATs: %d\n", fmt->ff_nfats); - fdbg("Sectors per cluster: %d sectors\n", 1 << fmt->ff_clustshift); - fdbg("FS size: %d sectors\n", var->fv_nfatsects); - fdbg(" %d clusters\n", var->fv_nclusters); - if (var->fv_fattype != 32) - { - fdbg("Root directory slots: %d\n", fmt->ff_rootdirentries); - } - fdbg("Volume ID: %08x\n", fmt->ff_volumeid); - fdbg("Volume Label: \"%c%c%c%c%c%c%c%c%c%c%c\"\n", - fmt->ff_volumelabel[0], fmt->ff_volumelabel[1], fmt->ff_volumelabel[2], - fmt->ff_volumelabel[3], fmt->ff_volumelabel[4], fmt->ff_volumelabel[5], - fmt->ff_volumelabel[6], fmt->ff_volumelabel[7], fmt->ff_volumelabel[8], - fmt->ff_volumelabel[9], fmt->ff_volumelabel[10]); -#endif - return OK; -} - |