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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** FileX Component */ |
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/** */ |
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/** Utility */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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#define FX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "fx_api.h" |
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#include "fx_system.h" |
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#include "fx_utility.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _fx_utility_FAT_flush PORTABLE C */ |
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/* 6.1.2 */ |
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/* AUTHOR */ |
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/* */ |
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/* William E. Lamie, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function flushes the contents of the FAT cache to the media. */ |
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/* 12-bit, 16-bit and 32-bit FAT writing is supported. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* media_ptr Media control block pointer */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* return status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _fx_utility_16_unsigned_write Write a UINT into buffer */ |
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/* _fx_utility_32_unsigned_read Read a ULONG from buffer */ |
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/* _fx_utility_32_unsigned_write Write a ULONG into buffer */ |
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/* _fx_utility_logical_sector_read Read FAT sector into memory */ |
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/* _fx_utility_logical_sector_write Write FAT sector back to disk */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* FileX System Functions */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 William E. Lamie Initial Version 6.0 */ |
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/* 09-30-2020 William E. Lamie Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* 11-09-2020 William E. Lamie Modified comment(s), */ |
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/* updated logic for */ |
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/* FAT secondary update map, */ |
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/* resulting in version 6.1.2 */ |
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/* */ |
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/**************************************************************************/ |
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471818 |
UINT _fx_utility_FAT_flush(FX_MEDIA *media_ptr) |
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{ |
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ULONG FAT_sector; |
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ULONG byte_offset; |
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UCHAR *FAT_ptr; |
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UINT temp, i; |
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UINT status, index, ind; |
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ULONG cluster, next_cluster; |
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UCHAR sectors_per_bit; |
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INT multi_sector_entry; |
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ULONG sector; |
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#ifndef FX_MEDIA_STATISTICS_DISABLE |
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/* Increment the number of cache flush requests. */ |
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471818 |
media_ptr -> fx_media_fat_cache_flushes++; |
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#endif |
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/* Loop through the media's FAT cache and flush out dirty entries. */ |
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✓✓ |
26793961 |
for (index = 0; index < FX_MAX_FAT_CACHE; index++) |
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{ |
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/* Determine if the entry is dirty. */ |
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✓✓ |
26389883 |
if ((media_ptr -> fx_media_fat_cache[index].fx_fat_cache_entry_dirty) == 0) |
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{ |
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/* No, just advance to the next entry. */ |
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25945006 |
continue; |
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} |
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/* Otherwise, the entry is indeed dirty and must be flushed out. Process |
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relative to the type of FAT that is being used. */ |
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/* Pickup the contents of the FAT cache entry. */ |
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444877 |
cluster = media_ptr -> fx_media_fat_cache[index].fx_fat_cache_entry_cluster; |
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/* Determine which type of FAT is present. */ |
117 |
✓✓ |
444877 |
if (media_ptr -> fx_media_12_bit_FAT) |
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{ |
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/* Calculate the byte offset to the cluster entry. */ |
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42809 |
byte_offset = (((ULONG)cluster << 1) + cluster) >> 1; |
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/* Calculate the FAT sector the requested FAT entry resides in. */ |
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42809 |
FAT_sector = (byte_offset / media_ptr -> fx_media_bytes_per_sector) + |
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42809 |
(ULONG)media_ptr -> fx_media_reserved_sectors; |
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/* Initialize as not written. */ |
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42809 |
multi_sector_entry = -1; |
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for (;;) |
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{ |
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/* Pickup the FAT sector. */ |
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7777 |
status = _fx_utility_logical_sector_read(media_ptr, (ULONG64) FAT_sector, |
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50586 |
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_FAT_SECTOR); |
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/* Determine if an error occurred. */ |
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✓✓ |
50586 |
if (status != FX_SUCCESS) |
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{ |
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/* Return the error status. */ |
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19464 |
return(status); |
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} |
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/* Determine if a mulit-sector FAT update is present. */ |
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✓✓ |
31122 |
if (multi_sector_entry != -1) |
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{ |
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/* Yes, store the remaining portion of the new FAT entry in the |
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next FAT sector. */ |
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/* Setup a pointer into the buffer. */ |
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4191 |
FAT_ptr = (UCHAR *)media_ptr -> fx_media_memory_buffer; |
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/* Pickup the cluster and next cluster. */ |
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4191 |
cluster = (media_ptr -> fx_media_fat_cache[multi_sector_entry].fx_fat_cache_entry_cluster); |
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4191 |
next_cluster = media_ptr -> fx_media_fat_cache[multi_sector_entry].fx_fat_cache_entry_value; |
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/* Determine if the cluster entry is odd or even. */ |
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✓✓ |
4191 |
if (cluster & 1) |
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{ |
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/* Store the upper 8 bits of the FAT entry. */ |
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2215 |
*FAT_ptr = (UCHAR)((next_cluster >> 4) & 0xFF); |
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} |
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else |
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{ |
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/* Store the upper 4 bits of the FAT entry. */ |
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1976 |
temp = ((UINT)*FAT_ptr) & 0xF0; |
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1976 |
*FAT_ptr = (UCHAR)(temp | ((next_cluster >> 8) & 0xF)); |
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} |
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/* Clear the multi-sector flag. */ |
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4191 |
multi_sector_entry = -1; |
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} |
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/* Loop through the remainder of the cache to check for multiple entries |
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within the same FAT sector being written out. */ |
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✓✓ |
1943515 |
for (i = index; i < FX_MAX_FAT_CACHE; i++) |
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{ |
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/* Is the cache entry dirty? */ |
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✓✓ |
1912393 |
if ((media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_dirty) == 0) |
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{ |
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/* Not dirty, does not need to be flushed. */ |
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566837 |
continue; |
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} |
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/* Isolate the cluster. */ |
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1345556 |
cluster = (media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_cluster); |
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/* Calculate the byte offset to the cluster entry. */ |
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1345556 |
byte_offset = (((ULONG)cluster << 1) + cluster) >> 1; |
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/* Pickup the sector. */ |
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1345556 |
sector = (byte_offset / media_ptr -> fx_media_bytes_per_sector) + |
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1345556 |
(ULONG)media_ptr -> fx_media_reserved_sectors; |
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/* Is it the current FAT sector? */ |
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✓✓ |
1345556 |
if (sector != FAT_sector) |
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{ |
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/* Different FAT sector - not in this pass of the loop. */ |
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346287 |
continue; |
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} |
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/* Pickup new value for this FAT entry. */ |
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999269 |
next_cluster = media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_value; |
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/* Now calculate the byte offset into this FAT sector. */ |
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999269 |
byte_offset = byte_offset - |
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999269 |
((FAT_sector - (ULONG)media_ptr -> fx_media_reserved_sectors) * |
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999269 |
media_ptr -> fx_media_bytes_per_sector); |
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/* Determine if we are now past the end of the FAT buffer in memory. */ |
218 |
✓✓ |
999269 |
if (byte_offset == (ULONG)(media_ptr -> fx_media_bytes_per_sector - 1)) |
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{ |
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/* Yes, we need to read the next sector */ |
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7777 |
multi_sector_entry = (INT)i; |
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} |
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/* Setup a pointer into the buffer. */ |
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999269 |
FAT_ptr = (UCHAR *)media_ptr -> fx_media_memory_buffer + (UINT)byte_offset; |
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228 |
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/* Clear the dirty flag. */ |
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999269 |
media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_dirty = 0; |
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/* Determine if the cluster entry is odd or even. */ |
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✓✓ |
999269 |
if (cluster & 1) |
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{ |
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/* Odd cluster number. */ |
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/* Pickup the upper nibble of the FAT entry. */ |
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/* First, set the lower nibble of the FAT entry. */ |
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500112 |
temp = (((UINT)*FAT_ptr) & 0x0F); |
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500112 |
*FAT_ptr = (UCHAR)(temp | ((next_cluster << 4) & 0xF0)); |
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/* Determine if this is a mulit-sector entry. */ |
244 |
✓✓ |
500112 |
if ((multi_sector_entry) == (INT)i) |
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{ |
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247 |
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/* Yes, requires multiple sector - will write rest of the part later. */ |
248 |
|
4143 |
continue; |
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} |
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251 |
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/* Move to the next byte of the FAT entry. */ |
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495969 |
FAT_ptr++; |
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254 |
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/* Store the upper 8 bits of the FAT entry. */ |
255 |
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495969 |
*FAT_ptr = (UCHAR)((next_cluster >> 4) & 0xFF); |
256 |
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} |
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else |
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{ |
259 |
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260 |
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/* Even cluster number. */ |
261 |
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262 |
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/* Store the lower byte of the FAT entry. */ |
263 |
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499157 |
*FAT_ptr = (UCHAR)(next_cluster & 0xFF); |
264 |
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265 |
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/* Determine if this is a mulit-sector entry. */ |
266 |
✓✓ |
499157 |
if ((multi_sector_entry) == (INT)i) |
267 |
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{ |
268 |
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269 |
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/* Yes, requires multiple sector - will write rest of the part later. */ |
270 |
|
3634 |
continue; |
271 |
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} |
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273 |
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/* Move to the next nibble of the FAT entry. */ |
274 |
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495523 |
FAT_ptr++; |
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276 |
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/* Store the upper 4 bits of the FAT entry. */ |
277 |
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495523 |
temp = ((UINT)*FAT_ptr) & 0xF0; |
278 |
|
495523 |
*FAT_ptr = (UCHAR)(temp | ((next_cluster >> 8) & 0xF)); |
279 |
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} |
280 |
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} |
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282 |
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/* First, write out the current sector. */ |
283 |
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31122 |
status = _fx_utility_logical_sector_write(media_ptr, (ULONG64) FAT_sector, |
284 |
|
31122 |
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_FAT_SECTOR); |
285 |
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/* Determine if an error occurred. */ |
286 |
✓✓ |
31122 |
if (status != FX_SUCCESS) |
287 |
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{ |
288 |
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289 |
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/* Return the error status. */ |
290 |
|
1 |
return(status); |
291 |
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} |
292 |
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293 |
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/* Mark the FAT sector update bit map to indicate this sector has been written. */ |
294 |
✓✓ |
31121 |
if (media_ptr -> fx_media_sectors_per_FAT % (FX_FAT_MAP_SIZE << 3) == 0) |
295 |
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{ |
296 |
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30762 |
sectors_per_bit = (UCHAR)((UINT)media_ptr -> fx_media_sectors_per_FAT / (FX_FAT_MAP_SIZE << 3)); |
297 |
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} |
298 |
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else |
299 |
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{ |
300 |
|
359 |
sectors_per_bit = (UCHAR)((UINT)media_ptr -> fx_media_sectors_per_FAT / (FX_FAT_MAP_SIZE << 3) + 1); |
301 |
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} |
302 |
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303 |
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/* Check for invalid value. */ |
304 |
✓✓ |
31121 |
if (sectors_per_bit == 0) |
305 |
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{ |
306 |
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307 |
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/* Invalid media, return error. */ |
308 |
|
1 |
return(FX_MEDIA_INVALID); |
309 |
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} |
310 |
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311 |
|
31120 |
ind = ((FAT_sector - media_ptr -> fx_media_reserved_sectors) / sectors_per_bit) >> 3; |
312 |
|
31120 |
media_ptr -> fx_media_fat_secondary_update_map[ind] = |
313 |
|
31120 |
(UCHAR)((INT)media_ptr -> fx_media_fat_secondary_update_map[ind] |
314 |
|
31120 |
| (1 <<(((FAT_sector - media_ptr -> fx_media_reserved_sectors) / sectors_per_bit) & 7))); |
315 |
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316 |
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/* Determine if the multi-sector flag is set. */ |
317 |
✓✓ |
31120 |
if (multi_sector_entry != -1) |
318 |
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{ |
319 |
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320 |
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/* Yes, position to the next sector and read it in. */ |
321 |
|
7777 |
FAT_sector++; |
322 |
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} |
323 |
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else |
324 |
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{ |
325 |
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326 |
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/* No, we are finished with this loop. */ |
327 |
|
23343 |
break; |
328 |
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} |
329 |
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} |
330 |
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} |
331 |
✓✓ |
402068 |
else if (!media_ptr -> fx_media_32_bit_FAT) |
332 |
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{ |
333 |
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334 |
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/* 16-bit FAT is present. */ |
335 |
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336 |
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/* Calculate the byte offset to the cluster entry. */ |
337 |
|
322340 |
byte_offset = (((ULONG)cluster) << 1); |
338 |
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339 |
|
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/* Calculate the FAT sector the requested FAT entry resides in. */ |
340 |
|
322340 |
FAT_sector = (byte_offset / media_ptr -> fx_media_bytes_per_sector) + |
341 |
|
322340 |
(ULONG)media_ptr -> fx_media_reserved_sectors; |
342 |
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343 |
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/* Read the FAT sector. */ |
344 |
|
322340 |
status = _fx_utility_logical_sector_read(media_ptr, (ULONG64) FAT_sector, |
345 |
|
322340 |
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_FAT_SECTOR); |
346 |
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347 |
|
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/* Determine if an error occurred. */ |
348 |
✓✓ |
322340 |
if (status != FX_SUCCESS) |
349 |
|
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{ |
350 |
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351 |
|
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/* Return the error status. */ |
352 |
|
19548 |
return(status); |
353 |
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} |
354 |
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|
355 |
|
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/* Loop through the remainder of the cache to check for multiple entries |
356 |
|
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within the same FAT sector being written out. */ |
357 |
✓✓ |
11884775 |
for (i = index; i < FX_MAX_FAT_CACHE; i++) |
358 |
|
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{ |
359 |
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|
360 |
|
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/* Determine if the entry is dirty. */ |
361 |
✓✓ |
11581983 |
if (media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_dirty == 0) |
362 |
|
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{ |
363 |
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364 |
|
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/* Not dirty, does not need to be flushed. */ |
365 |
|
9622433 |
continue; |
366 |
|
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} |
367 |
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368 |
|
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/* Isolate the cluster. */ |
369 |
|
1959550 |
cluster = (media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_cluster); |
370 |
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371 |
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/* Calculate the byte offset to the cluster entry. */ |
372 |
|
1959550 |
byte_offset = (((ULONG)cluster) * 2); |
373 |
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374 |
|
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/* Pickup the sector. */ |
375 |
|
1959550 |
sector = (byte_offset / media_ptr -> fx_media_bytes_per_sector) + |
376 |
|
1959550 |
(ULONG)media_ptr -> fx_media_reserved_sectors; |
377 |
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|
378 |
|
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/* Is it the current FAT sector? */ |
379 |
✓✓ |
1959550 |
if (sector != FAT_sector) |
380 |
|
|
{ |
381 |
|
|
|
382 |
|
|
/* Different FAT sector - not in this pass of the loop. */ |
383 |
|
561471 |
continue; |
384 |
|
|
} |
385 |
|
|
|
386 |
|
|
/* Now calculate the byte offset into this FAT sector. */ |
387 |
|
1398079 |
byte_offset = byte_offset - |
388 |
|
1398079 |
((FAT_sector - (ULONG)media_ptr -> fx_media_reserved_sectors) * |
389 |
|
1398079 |
media_ptr -> fx_media_bytes_per_sector); |
390 |
|
|
|
391 |
|
|
/* Setup a pointer into the buffer. */ |
392 |
|
1398079 |
FAT_ptr = (UCHAR *)media_ptr -> fx_media_memory_buffer + (UINT)byte_offset; |
393 |
|
|
|
394 |
|
|
/* Pickup new value for this FAT entry. */ |
395 |
|
1398079 |
next_cluster = media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_value; |
396 |
|
|
|
397 |
|
|
/* Store the FAT entry. */ |
398 |
|
1398079 |
_fx_utility_16_unsigned_write(FAT_ptr, (UINT)next_cluster); |
399 |
|
|
|
400 |
|
|
/* Clear the dirty flag. */ |
401 |
|
1398079 |
media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_dirty = 0; |
402 |
|
|
} |
403 |
|
|
|
404 |
|
|
/* Write the last written FAT sector out. */ |
405 |
|
302792 |
status = _fx_utility_logical_sector_write(media_ptr, (ULONG64) FAT_sector, |
406 |
|
302792 |
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_FAT_SECTOR); |
407 |
|
|
|
408 |
|
|
/* Determine if an error occurred. */ |
409 |
✓✓ |
302792 |
if (status != FX_SUCCESS) |
410 |
|
|
{ |
411 |
|
|
/* Return the error status. */ |
412 |
|
1 |
return(status); |
413 |
|
|
} |
414 |
|
|
|
415 |
|
|
/* Mark the FAT sector update bit map to indicate this sector has been |
416 |
|
|
written. */ |
417 |
✓✓ |
302791 |
if (media_ptr -> fx_media_sectors_per_FAT % (FX_FAT_MAP_SIZE << 3) == 0) |
418 |
|
|
{ |
419 |
|
3 |
sectors_per_bit = (UCHAR)(media_ptr -> fx_media_sectors_per_FAT / (FX_FAT_MAP_SIZE << 3)); |
420 |
|
|
} |
421 |
|
|
else |
422 |
|
|
{ |
423 |
|
302788 |
sectors_per_bit = (UCHAR)((media_ptr -> fx_media_sectors_per_FAT / (FX_FAT_MAP_SIZE << 3)) + 1); |
424 |
|
|
} |
425 |
|
302791 |
ind = ((FAT_sector - media_ptr -> fx_media_reserved_sectors) / sectors_per_bit) >> 3; |
426 |
|
302791 |
media_ptr -> fx_media_fat_secondary_update_map[ind] = |
427 |
|
302791 |
(UCHAR)((INT)media_ptr -> fx_media_fat_secondary_update_map[ind] |
428 |
|
302791 |
| (1 <<(((FAT_sector - media_ptr -> fx_media_reserved_sectors) / sectors_per_bit) & 7))); |
429 |
|
|
} |
430 |
|
|
else |
431 |
|
|
{ |
432 |
|
|
|
433 |
|
|
/* 32-bit FAT is present. */ |
434 |
|
|
|
435 |
|
|
/* Calculate the byte offset to the cluster entry. */ |
436 |
|
79728 |
byte_offset = (((ULONG)cluster) * 4); |
437 |
|
|
|
438 |
|
|
/* Calculate the FAT sector the requested FAT entry resides in. */ |
439 |
|
79728 |
FAT_sector = (byte_offset / media_ptr -> fx_media_bytes_per_sector) + |
440 |
|
79728 |
(ULONG)media_ptr -> fx_media_reserved_sectors; |
441 |
|
|
|
442 |
|
|
/* Read the FAT sector. */ |
443 |
|
79728 |
status = _fx_utility_logical_sector_read(media_ptr, (ULONG64) FAT_sector, |
444 |
|
79728 |
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_FAT_SECTOR); |
445 |
|
|
|
446 |
|
|
/* Determine if an error occurred. */ |
447 |
✓✓ |
79728 |
if (status != FX_SUCCESS) |
448 |
|
|
{ |
449 |
|
|
|
450 |
|
|
/* Return the error status. */ |
451 |
|
28724 |
return(status); |
452 |
|
|
} |
453 |
|
|
|
454 |
|
|
/* Loop through the remainder of the cache to check for multiple entries |
455 |
|
|
within the same FAT sector being written out. */ |
456 |
✓✓ |
2997881 |
for (i = index; i < FX_MAX_FAT_CACHE; i++) |
457 |
|
|
{ |
458 |
|
|
|
459 |
|
|
/* Determine if the entry is dirty. */ |
460 |
✓✓ |
2946877 |
if (media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_dirty == 0) |
461 |
|
|
{ |
462 |
|
|
|
463 |
|
|
/* Not dirty, does not need to be flushed. */ |
464 |
|
867904 |
continue; |
465 |
|
|
} |
466 |
|
|
|
467 |
|
|
/* Isolate the cluster. */ |
468 |
|
2078973 |
cluster = (media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_cluster); |
469 |
|
|
|
470 |
|
|
/* Calculate the byte offset to the cluster entry. */ |
471 |
|
2078973 |
byte_offset = (((ULONG)cluster) * 4); |
472 |
|
|
|
473 |
|
|
/* Pickup the sector. */ |
474 |
|
2078973 |
sector = (byte_offset / media_ptr -> fx_media_bytes_per_sector) + |
475 |
|
2078973 |
(ULONG)media_ptr -> fx_media_reserved_sectors; |
476 |
|
|
|
477 |
|
|
/* Is it the current FAT sector? */ |
478 |
✓✓ |
2078973 |
if (sector != FAT_sector) |
479 |
|
|
{ |
480 |
|
|
|
481 |
|
|
/* Different FAT sector - not in this pass of the loop. */ |
482 |
|
1004363 |
continue; |
483 |
|
|
} |
484 |
|
|
|
485 |
|
|
/* Now calculate the byte offset into this FAT sector. */ |
486 |
|
1074610 |
byte_offset = byte_offset - |
487 |
|
1074610 |
((FAT_sector - (ULONG)media_ptr -> fx_media_reserved_sectors) * |
488 |
|
1074610 |
media_ptr -> fx_media_bytes_per_sector); |
489 |
|
|
|
490 |
|
|
/* Setup a pointer into the buffer. */ |
491 |
|
1074610 |
FAT_ptr = (UCHAR *)media_ptr -> fx_media_memory_buffer + (UINT)byte_offset; |
492 |
|
|
|
493 |
|
|
/* Pickup new value for this FAT entry. */ |
494 |
|
1074610 |
next_cluster = media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_value; |
495 |
|
|
|
496 |
|
|
/* Store the FAT entry. */ |
497 |
|
1074610 |
_fx_utility_32_unsigned_write(FAT_ptr, next_cluster); |
498 |
|
|
|
499 |
|
|
/* Clear the dirty flag. */ |
500 |
|
1074610 |
media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_dirty = 0; |
501 |
|
|
} |
502 |
|
|
|
503 |
|
|
/* Write the last written FAT sector out. */ |
504 |
|
51004 |
status = _fx_utility_logical_sector_write(media_ptr, (ULONG64) FAT_sector, |
505 |
|
51004 |
media_ptr -> fx_media_memory_buffer, ((ULONG) 1), FX_FAT_SECTOR); |
506 |
|
|
|
507 |
|
|
/* Determine if an error occurred. */ |
508 |
✓✓ |
51004 |
if (status != FX_SUCCESS) |
509 |
|
|
{ |
510 |
|
|
|
511 |
|
|
/* Return the error status. */ |
512 |
|
1 |
return(status); |
513 |
|
|
} |
514 |
|
|
|
515 |
|
|
|
516 |
|
|
/* Mark the FAT sector update bit map to indicate this sector has been |
517 |
|
|
written. */ |
518 |
✓✓ |
51003 |
if (media_ptr -> fx_media_sectors_per_FAT % (FX_FAT_MAP_SIZE << 3) == 0) |
519 |
|
|
{ |
520 |
|
46254 |
sectors_per_bit = (UCHAR)(media_ptr -> fx_media_sectors_per_FAT / (FX_FAT_MAP_SIZE << 3)); |
521 |
|
|
} |
522 |
|
|
else |
523 |
|
|
{ |
524 |
|
4749 |
sectors_per_bit = (UCHAR)((media_ptr -> fx_media_sectors_per_FAT / (FX_FAT_MAP_SIZE << 3)) + 1); |
525 |
|
|
} |
526 |
|
51003 |
ind = ((FAT_sector - media_ptr -> fx_media_reserved_sectors) / sectors_per_bit) >> 3; |
527 |
|
51003 |
media_ptr -> fx_media_fat_secondary_update_map[ind] = |
528 |
|
51003 |
(UCHAR)((INT)media_ptr -> fx_media_fat_secondary_update_map[ind] |
529 |
|
51003 |
| (1 <<(((FAT_sector - media_ptr -> fx_media_reserved_sectors) / sectors_per_bit) & 7))); |
530 |
|
|
} |
531 |
|
|
} |
532 |
|
|
|
533 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
534 |
|
|
|
535 |
|
|
/* While fault_tolerant is enabled, this function will be called before the return of all APIs. */ |
536 |
|
|
if (media_ptr -> fx_media_fault_tolerant_enabled) |
537 |
|
|
{ |
538 |
|
|
|
539 |
|
|
/* Delete the record of FAT sector since all FAT entries are flushed. */ |
540 |
|
|
media_ptr -> fx_media_fault_tolerant_cached_FAT_sector = 0; |
541 |
|
|
} |
542 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
543 |
|
|
|
544 |
|
|
/* Return successful status. */ |
545 |
|
404078 |
return(FX_SUCCESS); |
546 |
|
|
} |
547 |
|
|
|