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rfat_core.c
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rfat_core.c
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/*
* Copyright (c) 2014 Thomas Roell. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal with the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimers.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimers in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Thomas Roell, nor the names of its contributors
* may be used to endorse or promote products derived from this Software
* without specific prior written permission.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* WITH THE SOFTWARE.
*/
#include "rfat_core.h"
#include "rfat_port.h"
static rfat_volume_t rfat_volume;
static uint32_t rfat_cache[(1 +
RFAT_CONFIG_FAT_CACHE_ENTRIES +
((RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) ? 1 : 0) +
(((RFAT_CONFIG_FILE_DATA_CACHE == 0) ? 1 : RFAT_CONFIG_MAX_FILES) * RFAT_CONFIG_DATA_CACHE_ENTRIES))
* (RFAT_BLK_SIZE / sizeof(uint32_t))];
static const char rfat_dirname_dot[11] = ". ";
static const char rfat_dirname_dotdot[11] = ".. ";
#if (RFAT_CONFIG_VFAT_SUPPORTED == 1)
static const uint8_t rfat_path_ldir_name_table[13] = {
offsetof(rfat_ldir_t, ldir_name_1[0]),
offsetof(rfat_ldir_t, ldir_name_1[2]),
offsetof(rfat_ldir_t, ldir_name_1[4]),
offsetof(rfat_ldir_t, ldir_name_1[6]),
offsetof(rfat_ldir_t, ldir_name_1[8]),
offsetof(rfat_ldir_t, ldir_name_2[0]),
offsetof(rfat_ldir_t, ldir_name_2[2]),
offsetof(rfat_ldir_t, ldir_name_2[4]),
offsetof(rfat_ldir_t, ldir_name_2[6]),
offsetof(rfat_ldir_t, ldir_name_2[8]),
offsetof(rfat_ldir_t, ldir_name_2[10]),
offsetof(rfat_ldir_t, ldir_name_3[0]),
offsetof(rfat_ldir_t, ldir_name_3[2]),
};
#endif /* (RFAT_CONFIG_VFAT_SUPPORTED == 1) */
static int rfat_volume_init(rfat_volume_t *volume)
{
int status = F_NO_ERROR;
uint8_t *cache;
#if (RFAT_CONFIG_FILE_DATA_CACHE == 1)
#if (RFAT_CONFIG_MAX_FILES != 1)
rfat_file_t *file_s, *file_e;
#endif /* (RFAT_CONFIG_MAX_FILES != 1) */
#endif /* (RFAT_CONFIG_FILE_DATA_CACHE == 1) */
#if (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1)
/* In order not to mess up rfat_volume_t too much, the rfat_boot_t.bpblog struct is aliased to
* rfat_volume_t. The asserts below ensure that the struct elements don't move and mirror
* the location relative to rfat_boot_t.
*/
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_map_flags) >= offsetof(rfat_boot_t, bpb40.bs_reserved_1));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_map_flags) >= offsetof(rfat_boot_t, bpb71.bs_reserved_2));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.bs_trail_sig) == 510);
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_map_flags) == (offsetof(rfat_volume_t, map_flags) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_map_entries) == (offsetof(rfat_volume_t, map_entries) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_map_table) == (offsetof(rfat_volume_t, map_table) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_map_blkno) == (offsetof(rfat_volume_t, map_blkno) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_free_clscnt) == (offsetof(rfat_volume_t, free_clscnt) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_next_clsno) == (offsetof(rfat_volume_t, next_clsno) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_dir) == (offsetof(rfat_volume_t, dir) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_dir_flags) == (offsetof(rfat_volume_t, dir_flags) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_dir_entries) == (offsetof(rfat_volume_t, dir_entries) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_dir_index) == (offsetof(rfat_volume_t, dir_index) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_dir_clsno) == (offsetof(rfat_volume_t, dir_clsno) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_dot_clsno) == (offsetof(rfat_volume_t, dot_clsno) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_del_clsno) == (offsetof(rfat_volume_t, del_clsno) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_del_index) == (offsetof(rfat_volume_t, del_index) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_del_entries) == (offsetof(rfat_volume_t, del_entries) - offsetof(rfat_volume_t, bs_data)));
#if (RFAT_CONFIG_VFAT_SUPPORTED == 1)
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_lfn_count) == (offsetof(rfat_volume_t, lfn_count) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_lfn_blkno) == (offsetof(rfat_volume_t, lfn_blkno) - offsetof(rfat_volume_t, bs_data)));
#if (RFAT_CONFIG_UTF8_SUPPORTED == 0)
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.log_lfn_name) == (offsetof(rfat_volume_t, lfn_name) - offsetof(rfat_volume_t, bs_data)));
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.bs_trail_sig) == (offsetof(rfat_volume_t, bs_trail_sig) - offsetof(rfat_volume_t, bs_data)));
#else /* (RFAT_CONFIG_UTF8_SUPPORTED == 0) */
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.bs_trail_sig) == (offsetof(rfat_volume_t, bs_trail_sig) - offsetof(rfat_volume_t, lfn_name)));
#endif /* (RFAT_CONFIG_UTF8_SUPPORTED == 0) */
#else /* (RFAT_CONFIG_VFAT_SUPPORTED == 1) */
RFAT_CT_ASSERT(offsetof(rfat_boot_t, bpblog.bs_trail_sig) == (offsetof(rfat_volume_t, bs_trail_sig) - offsetof(rfat_volume_t, bs_data)));
#endif /* (RFAT_CONFIG_VFAT_SUPPORTED == 1) */
#endif /* (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) */
volume->disk = rfat_disk_acquire();
if (volume->disk)
{
volume->state = RFAT_VOLUME_STATE_INITIALIZED;
volume->flags = 0;
cache = (uint8_t*)&rfat_cache[0];
volume->dir_cache.data = cache;
cache += RFAT_BLK_SIZE;
#if (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1)
volume->map_cache.data = cache;
cache += RFAT_BLK_SIZE;
#endif /* (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) */
#if (RFAT_CONFIG_FAT_CACHE_ENTRIES != 0)
#if (RFAT_CONFIG_FAT_CACHE_ENTRIES == 1)
volume->fat_cache.data = cache;
cache += RFAT_BLK_SIZE;
#else /* (RFAT_CONFIG_FAT_CACHE_ENTRIES == 1) */
volume->fat_cache[0].data = cache;
cache += RFAT_BLK_SIZE;
volume->fat_cache[1].data = cache;
cache += RFAT_BLK_SIZE;
#endif /* (RFAT_CONFIG_FAT_CACHE_ENTRIES == 1) */
#endif /* (RFAT_CONFIG_FAT_CACHE_ENTRIES != 0) */
#if (RFAT_CONFIG_DATA_CACHE_ENTRIES != 0)
#if (RFAT_CONFIG_FILE_DATA_CACHE == 0)
volume->data_cache.data = cache;
cache += RFAT_BLK_SIZE;
#else /* (RFAT_CONFIG_FILE_DATA_CACHE == 0) */
#if (RFAT_CONFIG_MAX_FILES == 1)
volume->file_table[0].data_cache.data = cache;
#else /* (RFAT_CONFIG_MAX_FILES == 1) */
file_s = &volume->file_table[0];
file_e = &volume->file_table[RFAT_CONFIG_MAX_FILES];
do
{
file_s->data_cache.data = cache;
cache += RFAT_BLK_SIZE;
file_s++;
}
while (file_s < file_e);
#endif /* (RFAT_CONFIG_MAX_FILES == 1) */
#endif /* (RFAT_CONFIG_FILE_DATA_CACHE == 0) */
#endif /* (RFAT_CONFIG_DATA_CACHE_ENTRIES != 0) */
}
else
{
status = F_ERR_INITFUNC;
}
return status;
}
static int rfat_volume_mount(rfat_volume_t * volume)
{
int status = F_NO_ERROR;
bool write_protected;
uint32_t boot_blkno, tot_sec, cls_mask, cls_shift, blkcnt, blk_unit_size, product;
#if (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1)
uint32_t boot_blkcnt;
#endif /* (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) */
#if (RFAT_CONFIG_FSINFO_SUPPORTED == 1)
uint32_t next_clsno;
#endif /* (RFAT_CONFIG_FSINFO_SUPPORTED == 1) */
rfat_boot_t *boot;
#if (RFAT_CONFIG_MAX_FILES != 1)
rfat_file_t *file_s, *file_e;
#endif /* (RFAT_CONFIG_MAX_FILES != 1) */
#if (RFAT_CONFIG_CLUSTER_CACHE_ENTRIES != 0)
unsigned int index;
#endif /* (RFAT_CONFIG_CLUSTER_CACHE_ENTRIES != 0) */
#if (RFAT_CONFIG_STATISTICS == 1)
memset(&volume->statistics, 0, sizeof(volume->statistics));
#endif /* (RFAT_CONFIG_STATISTICS == 1) */
status = rfat_disk_info(volume->disk, &write_protected, &blkcnt, &blk_unit_size, &product);
if (status == F_NO_ERROR)
{
if (volume->state == RFAT_VOLUME_STATE_CARDREMOVED)
{
if (volume->product != product)
{
volume->state = RFAT_VOLUME_STATE_UNUSABLE;
status = F_ERR_UNUSABLE;
}
#if (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1)
else
{
/* Check whether the log needs to be replayed after a SDCARD power failure.
*/
if ((volume->log_lead_sig == RFAT_HTOFL(RFAT_LOG_LEAD_SIG)) &&
(volume->log_struct_sig == RFAT_HTOFL(RFAT_LOG_STRUCT_SIG)))
{
status = rfat_volume_commit(volume);
}
}
#endif /* (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) */
}
else
{
volume->flags = 0;
if (write_protected)
{
volume->flags |= RFAT_VOLUME_FLAG_WRITE_PROTECTED;
}
volume->product = product;
volume->serial = 0;
boot_blkno = 0;
#if (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1)
/* For a FAT32 file system TRANSACTION_SAFE needs 3 blocks,
* which are #3, #4 & #5, which are conveniantly reserved
* by the FAT32 spec. FAT16 is somewhat more tricky. There
* are 2 ways to lay out the BPB relative to FAT/DIR and still
* respect the erase boundary. One is to used a fixed value
* of 1 for bpb_rsvd_sec_cnt. That implies that there is at
* least 1 unused block before the BPB (since FAT/DIR always
* have an even count). The other variant is to anchor the BPB
* at an erase boundary, which then results in a bpb_rsvd_sec_cnt
* of at least 2, again 1 reserved block.
*/
boot_blkcnt = 0;
boot = (rfat_boot_t*)((void*)&volume->bs_data[0]);
#else /* (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) */
boot = (rfat_boot_t*)((void*)volume->dir_cache.data);
#endif /* (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) */
status = rfat_volume_read(volume, boot_blkno, (uint8_t*)boot);
if (status == F_NO_ERROR)
{
/* This is somewhat iffy. MMC/SDSC do support a FILE_FORMAT setting in CSD
* that points to a FDC descriptor, without partition table. However the
* default is to use a partition table (with BPB or extended BPB). Thus
* there are checks in place for the presence of a FDC descriptor, and
* a validation check for the partition table to filter out exFAT for SDXC.
*/
if (boot->bs.bs_trail_sig != RFAT_HTOFS(0xaa55))
{
status = F_ERR_NOTFORMATTED;
}
else
{
if (!((boot->bpb.bs_jmp_boot[0] == 0xe9) ||
((boot->bpb.bs_jmp_boot[0] == 0xeb) && (boot->bpb.bs_jmp_boot[2] == 0x90))))
{
if ((boot->mbr.mbr_par_table[0].mbr_sys_id == 0x01) ||
(boot->mbr.mbr_par_table[0].mbr_sys_id == 0x04) ||
(boot->mbr.mbr_par_table[0].mbr_sys_id == 0x06) ||
(boot->mbr.mbr_par_table[0].mbr_sys_id == 0x0b) ||
(boot->mbr.mbr_par_table[0].mbr_sys_id == 0x0c))
{
boot_blkno = RFAT_FTOHL(boot->mbr.mbr_par_table[0].mbr_rel_sec);
#if (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1)
if ((boot->mbr.mbr_par_table[1].mbr_sys_id == 0x00) &&
(boot->mbr.mbr_par_table[2].mbr_sys_id == 0x00) &&
(boot->mbr.mbr_par_table[3].mbr_sys_id == 0x00))
{
boot_blkcnt = boot_blkno -1;
}
#endif /* (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) */
status = rfat_volume_read(volume, boot_blkno, (uint8_t*)boot);
if (status == F_NO_ERROR)
{
if ((boot->bs.bs_trail_sig != RFAT_HTOFS(0xaa55)) ||
!((boot->bpb.bs_jmp_boot[0] == 0xe9) ||
((boot->bpb.bs_jmp_boot[0] == 0xeb) && (boot->bpb.bs_jmp_boot[2] == 0x90))))
{
status = F_ERR_NOTFORMATTED;
}
}
}
else
{
status = F_ERR_INVALIDMEDIA;
}
}
}
if (status == F_NO_ERROR)
{
/* Here we have a valid PBR signature, check whether there is a valid BPB.
*/
/* Legal values for bpb_byts_per_sec are 512, 1024, 2048 and 4096.
* Hence if 0x8000 is ored in, it will be illegal. This 0x8000 mask is
* used to figure out whether TRANSACTION_SAFE was in rfat_volume_commit
* or not.
*/
if ((boot->bpb.bpb_byts_per_sec != RFAT_HTOFS(RFAT_BLK_SIZE))
#if (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1)
&& ((boot->bpb.bpb_byts_per_sec != (0x8000 | RFAT_HTOFS(RFAT_BLK_SIZE))) ||
(boot->bpblog.log_lead_sig != RFAT_HTOFL(RFAT_LOG_LEAD_SIG)) ||
(boot->bpblog.log_struct_sig != RFAT_HTOFL(RFAT_LOG_STRUCT_SIG)))
#endif /* (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) */
)
{
status = F_ERR_NOTSUPPSECTORSIZE;
}
else if (!boot->bpb.bpb_sec_per_clus || (boot->bpb.bpb_sec_per_clus & (boot->bpb.bpb_sec_per_clus -1)))
{
status = F_ERR_INVALIDMEDIA;
}
else if ((boot->bpb.bpb_num_fats == 0) || (boot->bpb.bpb_num_fats > 2))
{
status = F_ERR_INVALIDMEDIA;
}
else if (!((boot->bpb.bpb_media == 0xf0) || (boot->bpb.bpb_media >= 0xf8)))
{
status = F_ERR_INVALIDMEDIA;
}
else
{
#if (RFAT_CONFIG_VOLUME_DIRTY_SUPPORTED == 1) && (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 0)
memcpy(&volume->bs_data[0], boot, sizeof(volume->bs_data));
#endif /* (RFAT_CONFIG_VOLUME_DIRTY_SUPPORTED == 1) && (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 0) */
volume->cls_size = (boot->bpb.bpb_sec_per_clus * RFAT_BLK_SIZE);
volume->cls_mask = volume->cls_size -1;
for (cls_mask = 0x8000, cls_shift = 16; !(volume->cls_mask & cls_mask); cls_mask >>= 1, cls_shift--) { }
volume->cls_shift = cls_shift;
volume->cls_blk_shift = cls_shift - RFAT_BLK_SHIFT;
volume->cls_blk_size = (1 << volume->cls_blk_shift);
volume->cls_blk_mask = volume->cls_blk_size -1;
volume->boot_blkno = boot_blkno;
/* FAT32 differs from FAT12/FAT16 by having bpb_fat_sz_16 forced to 0.
* The bpb_root_ent_cnt is ignored for the decision.
*/
if (boot->bpb.bpb_fat_sz_16 != 0)
{
/* FAT12/FAT16 */
volume->fsinfo_blkofs = 0;
volume->bkboot_blkofs = 0;
if (boot->bpb.bpb_tot_sec_16 != 0)
{
tot_sec = RFAT_FTOHS(boot->bpb.bpb_tot_sec_16);
}
else
{
tot_sec = RFAT_FTOHL(boot->bpb40.bpb_tot_sec_32);
}
volume->fat_blkcnt = RFAT_FTOHS(boot->bpb.bpb_fat_sz_16);
volume->fat1_blkno = volume->boot_blkno + RFAT_FTOHS(boot->bpb40.bpb_rsvd_sec_cnt);
if (boot->bpb.bpb_num_fats == 1)
{
volume->fat2_blkno = 0;
volume->root_blkno = volume->fat1_blkno + volume->fat_blkcnt;
}
else
{
volume->fat2_blkno = volume->fat1_blkno + volume->fat_blkcnt;
volume->root_blkno = volume->fat2_blkno + volume->fat_blkcnt;
}
volume->root_clsno = RFAT_CLSNO_NONE;
volume->root_blkcnt = ((RFAT_FTOHS(boot->bpb40.bpb_root_ent_cnt) * 32) + RFAT_BLK_MASK) >> RFAT_BLK_SHIFT;
volume->cls_blk_offset = (volume->root_blkno + volume->root_blkcnt) - (2 << volume->cls_blk_shift);
if (boot->bpb40.bs_boot_sig == 0x29)
{
volume->serial = RFAT_FTOHL(boot->bpb40.bs_vol_id);
#if (RFAT_CONFIG_VOLUME_DIRTY_SUPPORTED == 1)
if (boot->bpb40.bs_nt_reserved & 0x01)
{
volume->flags |= RFAT_VOLUME_FLAG_MOUNTED_DIRTY;
}
#endif /* (RFAT_CONFIG_VOLUME_DIRTY_SUPPORTED == 1) */
}
}
else
{
/* FAT32 */
volume->fsinfo_blkofs = RFAT_FTOHS(boot->bpb71.bpb_fsinfo);
volume->bkboot_blkofs = RFAT_FTOHS(boot->bpb71.bpb_bkboot);
tot_sec = RFAT_FTOHL(boot->bpb71.bpb_tot_sec_32);
volume->fat_blkcnt = RFAT_FTOHL(boot->bpb71.bpb_fat_sz_32);
volume->fat1_blkno = volume->boot_blkno + RFAT_FTOHS(boot->bpb71.bpb_rsvd_sec_cnt);
/* It's tempting to use bpb71.bpb_ext_flags here to modify mirroring,
* it seems to be problematic. For one most of the OSes do not support
* or respect this flag. The other minor detail is that Win95/Win98
* do use different settings than Win2k/WinXP/Win7.
*/
if (boot->bpb.bpb_num_fats == 1)
{
volume->fat2_blkno = 0;
volume->cls_blk_offset = (volume->fat1_blkno + volume->fat_blkcnt) - (2 << volume->cls_blk_shift);
}
else
{
volume->fat2_blkno = volume->fat1_blkno + volume->fat_blkcnt;
volume->cls_blk_offset = (volume->fat2_blkno + volume->fat_blkcnt) - (2 << volume->cls_blk_shift);
}
volume->root_clsno = RFAT_FTOHL(boot->bpb71.bpb_root_clus);
volume->root_blkno = volume->cls_blk_offset + (volume->root_clsno << volume->cls_blk_shift);
volume->root_blkcnt = volume->cls_blk_size;
if (boot->bpb71.bs_boot_sig == 0x29)
{
volume->serial = RFAT_FTOHL(boot->bpb71.bs_vol_id);
#if (RFAT_CONFIG_VOLUME_DIRTY_SUPPORTED == 1)
if (boot->bpb71.bs_nt_reserved & 0x01)
{
volume->flags |= RFAT_VOLUME_FLAG_MOUNTED_DIRTY;
}
#endif /* (RFAT_CONFIG_VOLUME_DIRTY_SUPPORTED == 1) */
}
}
if (status == F_NO_ERROR)
{
volume->last_clsno = (((boot_blkno + tot_sec) - volume->cls_blk_offset) >> volume->cls_blk_shift) -1;
#if (RFAT_CONFIG_SEQUENTIAL_SUPPORTED == 1) || (RFAT_CONFIG_CONTIGUOUS_SUPPORTED == 1)
if (blk_unit_size == 0)
{
/* Estimate the upper limit of the AU Size according to 4.13.1.8.1 from
* the blkcnt to compute volume->blk_unit_size, used to align contiguous
* cluster allocations.
*/
if (blkcnt < 4209984)
{
if (blkcnt <= 131072) /* <= 64MB -> 512k */
{
blk_unit_size = 1024;
}
else if (blkcnt <= 524288) /* <= 256MB -> 1MB */
{
blk_unit_size = 2048;
}
else /* <= 1GB -> 2MB */
{
blk_unit_size = 4096;
}
}
else
{
if (blkcnt <= 67108864) /* <= 32GB -> 4MB */
{
blk_unit_size = 8192;
}
else /* <= 64GB -> 16MB */
{
blk_unit_size = 32768;
}
}
}
volume->blk_unit_size = blk_unit_size;
volume->start_clsno = ((((volume->cls_blk_offset + (2 << volume->cls_blk_shift) + blk_unit_size -1)
/ blk_unit_size) * blk_unit_size)
- volume->cls_blk_offset) >> volume->cls_blk_shift;
volume->end_clsno = ((((((volume->last_clsno +1) << volume->cls_blk_shift) + volume->cls_blk_offset)
/ blk_unit_size) * blk_unit_size)
- volume->cls_blk_offset) >> volume->cls_blk_shift;
#endif /* (RFAT_CONFIG_SEQUENTIAL_SUPPORTED == 1) || (RFAT_CONFIG_CONTIGUOUS_SUPPORTED == 1) */
if (status == F_NO_ERROR)
{
if ((volume->last_clsno -1) < 4085)
{
#if (RFAT_CONFIG_FAT12_SUPPORTED == 1)
volume->type = RFAT_VOLUME_TYPE_FAT12;
#else /* (RFAT_CONFIG_FAT12_SUPPORTED == 1) */
status = F_ERR_INVALIDMEDIA;
#endif /* (RFAT_CONFIG_FAT12_SUPPORTED == 1) */
}
else
{
if ((volume->last_clsno -1) < 65525)
{
volume->type = RFAT_VOLUME_TYPE_FAT16;
}
else
{
volume->type = RFAT_VOLUME_TYPE_FAT32;
}
}
if (status == F_NO_ERROR)
{
/* Assign the caches.
*/
volume->dir_cache.blkno = RFAT_BLKNO_INVALID;
#if (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1)
volume->map_cache.blkno = RFAT_BLKNO_INVALID;
#endif /* (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) */
#if (RFAT_CONFIG_FAT_CACHE_ENTRIES != 0)
#if (RFAT_CONFIG_FAT_CACHE_ENTRIES == 1)
volume->fat_cache.blkno = RFAT_BLKNO_INVALID;
#else /* (RFAT_CONFIG_FAT_CACHE_ENTRIES == 1) */
volume->fat_cache[0].blkno = RFAT_BLKNO_INVALID;
volume->fat_cache[1].blkno = RFAT_BLKNO_INVALID;
#endif /* (RFAT_CONFIG_FAT_CACHE_ENTRIES == 1) */
#endif /* (RFAT_CONFIG_FAT_CACHE_ENTRIES != 0) */
#if (RFAT_CONFIG_FILE_DATA_CACHE == 0)
volume->data_file = NULL;
#if (RFAT_CONFIG_DATA_CACHE_ENTRIES != 0)
volume->data_cache.blkno = RFAT_BLKNO_INVALID;
#endif /* (RFAT_CONFIG_DATA_CACHE_ENTRIES != 0) */
#endif /* (RFAT_CONFIG_FILE_DATA_CACHE == 0) */
#if (RFAT_CONFIG_CLUSTER_CACHE_ENTRIES != 0)
for (index = 0; index < RFAT_CONFIG_CLUSTER_CACHE_ENTRIES; index++)
{
volume->cluster_cache[index].clsno = RFAT_CLSNO_NONE;
volume->cluster_cache[index].clsdata = RFAT_CLSNO_NONE;
}
#endif /* (RFAT_CONFIG_CLUSTER_CACHE_ENTRIES != 0) */
volume->cwd_clsno = RFAT_CLSNO_NONE;
#if (RFAT_CONFIG_MAX_FILES == 1)
volume->file_table[0].mode = 0;
#else /* (RFAT_CONFIG_MAX_FILES == 1) */
file_s = &volume->file_table[0];
file_e = &volume->file_table[RFAT_CONFIG_MAX_FILES];
do
{
file_s->mode = 0;
file_s++;
}
while (file_s < file_e);
#endif /* (RFAT_CONFIG_MAX_FILES == 1) */
#if (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1)
if (!write_protected)
{
/* Check whether the log needs to be replayed, or whether
* the BPB has to be set up in memory.
*/
if ((boot->bpblog.log_lead_sig == RFAT_HTOFL(RFAT_LOG_LEAD_SIG)) &&
(boot->bpblog.log_struct_sig == RFAT_HTOFL(RFAT_LOG_STRUCT_SIG)))
{
status = rfat_volume_commit(volume);
}
else
{
if ((boot->bpb.bpb_num_fats == 2) && (volume->fat_blkcnt <= 8192))
{
if (volume->type != RFAT_VOLUME_TYPE_FAT32)
{
if (RFAT_FTOHS(boot->bpb40.bpb_rsvd_sec_cnt) != 1)
{
boot->bpblog.log_lfn_blkno = volume->boot_blkno +1;
}
else
{
if (boot_blkcnt == 0)
{
status = F_ERR_UNUSABLE;
}
else
{
boot->bpblog.log_lfn_blkno = volume->boot_blkno -1;
}
}
boot->bpblog.log_map_blkno = RFAT_BLKNO_RESERVED;
}
else
{
if ((volume->fsinfo_blkofs != 1) || (volume->bkboot_blkofs != 6))
{
status = F_ERR_UNUSABLE;
}
else
{
boot->bpblog.log_lfn_blkno = volume->boot_blkno +3;
boot->bpblog.log_map_blkno = volume->boot_blkno +4;
}
}
if (status == F_NO_ERROR)
{
boot->bpblog.log_map_flags = 0;
boot->bpblog.log_map_entries = 0;
boot->bpblog.log_dir_flags = 0;
boot->bpblog.log_lead_sig = RFAT_HTOFL(0x00000000);
boot->bpblog.log_struct_sig = RFAT_HTOFL(0x00000000);
}
}
else
{
status = F_ERR_UNUSABLE;
}
}
}
else
{
status = F_ERR_WRITEPROTECT;
}
#if (RFAT_CONFIG_FSINFO_SUPPORTED == 1)
/* For TRANSACTION_SAFE the FSINFO might have been already read
* throu rfat_volume_commit(). In this case RFAT_VOLUME_FLAG_FSINFO_VALID
* would be already set ...
*/
if (!(volume->flags & RFAT_VOLUME_FLAG_FSINFO_VALID))
#endif /* (RFAT_CONFIG_FSINFO_SUPPORTED == 1) */
#endif /* (RFAT_CONFIG_TRANSACTION_SAFE_SUPPORTED == 1) */
{
volume->next_clsno = 2;
#if (RFAT_CONFIG_FSINFO_SUPPORTED == 1)
volume->free_clscnt = 0;
if (status == F_NO_ERROR)
{
if (volume->fsinfo_blkofs != 0)
{
rfat_fsinfo_t *fsinfo = (rfat_fsinfo_t*)((void*)volume->dir_cache.data);
status = rfat_volume_read(volume, volume->boot_blkno + volume->fsinfo_blkofs, (uint8_t*)fsinfo);
if (status == F_NO_ERROR)
{
if ((fsinfo->fsi_lead_sig == RFAT_HTOFL(0x41615252)) &&
(fsinfo->fsi_struc_sig == RFAT_HTOFL(0x61417272)) &&
(fsinfo->fsi_trail_sig == RFAT_HTOFL(0xaa550000)))
{
#if (RFAT_CONFIG_VOLUME_DIRTY_SUPPORTED == 1)
if (!(volume->flags & RFAT_VOLUME_FLAG_MOUNTED_DIRTY))
#endif /* (RFAT_CONFIG_VOLUME_DIRTY_SUPPORTED == 1) */
{
if (fsinfo->fsi_free_count != 0xffffffff)
{
volume->free_clscnt = RFAT_FTOHL(fsinfo->fsi_free_count);
if (volume->free_clscnt <= (volume->last_clsno -1))
{
volume->flags |= RFAT_VOLUME_FLAG_FSINFO_VALID;
}
}
}
if (fsinfo->fsi_nxt_free != 0xffffffff)
{
next_clsno = RFAT_FTOHL(fsinfo->fsi_nxt_free);
if ((next_clsno >= 2) && (next_clsno <= volume->last_clsno))
{
volume->next_clsno = next_clsno;
}
}
}
}
}
}
#endif /* (RFAT_CONFIG_FSINFO_SUPPORTED == 1) */
}
if (status == F_NO_ERROR)
{
#if (RFAT_CONFIG_SEQUENTIAL_SUPPORTED == 1)
volume->free_clsno = volume->start_clsno;
volume->base_clsno = volume->start_clsno;
volume->limit_clsno = volume->start_clsno;
#endif /* (RFAT_CONFIG_SEQUENTIAL_SUPPORTED == 1) */
}
}
}
}
}
}
}
}
if (status == F_NO_ERROR)
{
volume->state = RFAT_VOLUME_STATE_MOUNTED;
}
}
return status;
}
static int rfat_volume_unmount(rfat_volume_t * volume)
{
int status = F_NO_ERROR;
rfat_file_t *file;
#if (RFAT_CONFIG_MAX_FILES > 1)
rfat_file_t *file_e;
#endif /* (RFAT_CONFIG_MAX_FILES > 1) */
if (volume->state >= RFAT_VOLUME_STATE_MOUNTED)
{
#if (RFAT_CONFIG_MAX_FILES == 1)
file = &volume->file_table[0];
if (file->mode)
{
status = rfat_file_close(volume, file);
}
#else /* (RFAT_CONFIG_MAX_FILES == 1) */
file = &volume->file_table[0];
file_e = &volume->file_table[RFAT_CONFIG_MAX_FILES];
do
{
if (file->mode)
{
status = rfat_file_close(volume, file);
}
file++;
}
while ((status == F_NO_ERROR) && (file < file_e));
#endif /* (RFAT_CONFIG_MAX_FILES == 1) */
if (status == F_NO_ERROR)
{
/* Revert the state to be RFAT_VOLUME_STATE_INITIALIZED, so that can be remounted.
*/
volume->state = RFAT_VOLUME_STATE_INITIALIZED;
}
}
return status;
}
static int rfat_volume_lock(rfat_volume_t *volume)
{
int status = F_NO_ERROR;
if (volume->state == RFAT_VOLUME_STATE_NONE)
{
status = F_ERR_INITFUNC;
}
else
{
#if defined(RFAT_PORT_CORE_LOCK)
if (!RFAT_PORT_CORE_LOCK())
{
status = F_ERR_BUSY;
}
else
#endif /* RFAT_PORT_CORE_LOCK */
{
if (volume->state == RFAT_VOLUME_STATE_UNUSABLE)
{
status = F_ERR_UNUSABLE;
}
else
{
/*
* Check here whether the volume is mounted. If not mount it. If it cannot
* be mounted, throw an error.
*/
if (volume->state != RFAT_VOLUME_STATE_MOUNTED)
{
if (volume->disk == NULL)
{
status = F_ERR_INITFUNC;
}
else
{
status = rfat_volume_mount(volume);
}
}
}
#if defined(RFAT_PORT_CORE_UNLOCK)
if (status != F_NO_ERROR)
{
RFAT_PORT_CORE_UNLOCK();
}
#endif /* RFAT_PORT_CORE_UNLOCK */
}
}
return status;
}
static int rfat_volume_lock_noinit(rfat_volume_t *volume)
{
int status = F_NO_ERROR;
if (volume->state == RFAT_VOLUME_STATE_NONE)
{
#if defined(RFAT_PORT_CORE_INIT)
if (RFAT_PORT_CORE_INIT())
#endif /* RFAT_PORT_CORE_INIT */
{
volume->state = RFAT_VOLUME_STATE_INITIALIZED;
}
}
if (volume->state == RFAT_VOLUME_STATE_NONE)
{
status = F_ERR_INITFUNC;
}
else
{
#if defined(RFAT_PORT_CORE_LOCK)
if (!RFAT_PORT_CORE_LOCK())
{
status = F_ERR_BUSY;
}
#endif /* RFAT_PORT_CORE_LOCK */
}
return status;
}
static int rfat_volume_lock_nomount(rfat_volume_t *volume)
{
int status = F_NO_ERROR;
if (volume->state == RFAT_VOLUME_STATE_NONE)
{
status = F_ERR_INITFUNC;
}
else
{
#if defined(RFAT_PORT_CORE_LOCK)
if (!RFAT_PORT_CORE_LOCK())
{
status = F_ERR_BUSY;
}
else
#endif /* RFAT_PORT_CORE_LOCK */
{
if (volume->disk == NULL)
{
status = F_ERR_INITFUNC;
}
#if defined(RFAT_PORT_CORE_UNLOCK)
RFAT_PORT_CORE_UNLOCK();
#endif /* RFAT_PORT_CORE_UNLOCK */
}
}
return status;
}
static int rfat_volume_unlock(rfat_volume_t *volume, int status)
{
if (status != F_NO_ERROR)
{
#if (RFAT_CONFIG_MEDIA_FAILURE_SUPPORTED == 1)
if (status == F_ERR_INVALIDSECTOR)
{
volume->flags |= RFAT_VOLUME_FLAG_MEDIA_FAILURE;
}
else
#endif /* (RFAT_CONFIG_MEDIA_FAILURE_SUPPORTED == 1) */
{
if (status == F_ERR_CARDREMOVED)
{
volume->state = RFAT_VOLUME_STATE_CARDREMOVED;
}
if (status == F_ERR_UNUSABLE)
{
volume->state = RFAT_VOLUME_STATE_UNUSABLE;
}
}
}
#if defined(RFAT_PORT_CORE_UNLOCK)
RFAT_PORT_CORE_UNLOCK();
#endif /* RFAT_PORT_CORE_UNLOCK */
return status;
}
static int rfat_volume_read(rfat_volume_t *volume, uint32_t address, uint8_t *data)
{
int status = F_NO_ERROR;
#if (RFAT_CONFIG_META_DATA_RETRIES != 0)
unsigned int retries = RFAT_CONFIG_META_DATA_RETRIES +1;
#else /* (RFAT_CONFIG_META_DATA_RETRIES != 0) */
unsigned int retries = 0;
#endif /* (RFAT_CONFIG_META_DATA_RETRIES != 0) */
do
{
// status = rfat_disk_read(volume->disk, address, data);
status = rfat_disk_read_sequential(volume->disk, address, 1, data);
if ((status == F_ERR_ONDRIVE) && (retries >= 1))
{
status = F_NO_ERROR;
retries--;
}
else
{
retries = 0;
}
}
while ((status == F_NO_ERROR) && retries);
#if (RFAT_CONFIG_MEDIA_FAILURE_SUPPORTED == 1)
if (status == F_ERR_INVALIDSECTOR)
{
volume->flags |= RFAT_VOLUME_FLAG_MEDIA_FAILURE;
}
#endif /* (RFAT_CONFIG_MEDIA_FAILURE_SUPPORTED == 1) */
if (status != F_NO_ERROR)
{
if (status != F_ERR_CARDREMOVED)
{
status = F_ERR_UNUSABLE;
}
}
return status;
}
static int rfat_volume_write(rfat_volume_t *volume, uint32_t address, const uint8_t *data)
{
int status = F_NO_ERROR;
#if (RFAT_CONFIG_META_DATA_RETRIES != 0)
unsigned int retries = RFAT_CONFIG_META_DATA_RETRIES +1;
#else /* (RFAT_CONFIG_META_DATA_RETRIES != 0) */
unsigned int retries = 0;
#endif /* (RFAT_CONFIG_META_DATA_RETRIES != 0) */
do
{
status = rfat_disk_write(volume->disk, address, data);
if ((status == F_ERR_ONDRIVE) && (retries >= 1))
{
status = F_NO_ERROR;
retries--;
}
else
{
retries = 0;
}
}
while ((status == F_NO_ERROR) && retries);
#if (RFAT_CONFIG_MEDIA_FAILURE_SUPPORTED == 1)
if (status == F_ERR_INVALIDSECTOR)