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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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#ifdef FX_ENABLE_FAULT_TOLERANT |
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#include "fx_fault_tolerant.h" |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _fx_utility_logical_sector_write PORTABLE C */ |
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/* 6.1.6 */ |
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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 handles logical sector write requests for all FileX */ |
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/* components. If the logical sector is currently in the media's */ |
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/* buffer supplied by the caller, the function simply marks the buffer */ |
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/* as written to. Otherwise, physical I/O is requested through the */ |
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/* corresponding I/O driver. */ |
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/* */ |
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/* Note: Conversion of the logical sector is done inside the driver. */ |
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/* This results in a performance boost for FLASH or RAM media */ |
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/* devices. */ |
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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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/* logical_sector Logical sector number */ |
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/* buffer_ptr Pointer of sector buffer */ |
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/* sectors Number of sectors to write */ |
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/* sector_type Type of sector(s) to write */ |
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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_logical_sector_flush Flush and invalidate sectors */ |
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/* that overlap with non-cache */ |
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/* sector I/O. */ |
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/* I/O Driver */ |
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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), and */ |
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/* added conditional to */ |
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/* disable cache, */ |
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/* resulting in version 6.1 */ |
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/* 04-02-2021 Bhupendra Naphade Modified comment(s), */ |
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/* updated check for logical */ |
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/* sector value, */ |
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/* resulting in version 6.1.6 */ |
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/* */ |
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/**************************************************************************/ |
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4467652 |
UINT _fx_utility_logical_sector_write(FX_MEDIA *media_ptr, ULONG64 logical_sector, |
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VOID *buffer_ptr, ULONG sectors, UCHAR sector_type) |
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{ |
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#ifndef FX_DISABLE_CACHE |
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FX_CACHED_SECTOR *cache_entry; |
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UINT cache_size; |
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UINT index; |
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UINT i; |
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4467652 |
UCHAR cache_found = FX_FALSE; |
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#endif /* FX_DISABLE_CACHE */ |
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#ifndef FX_MEDIA_STATISTICS_DISABLE |
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/* Determine if the request is for FAT sector. */ |
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✓✓ |
4467652 |
if (sector_type == FX_FAT_SECTOR) |
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{ |
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/* Increment the number of FAT sector writes. */ |
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3547771 |
media_ptr -> fx_media_fat_sector_writes++; |
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} |
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/* Increment the number of logical sectors written. */ |
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4467652 |
media_ptr -> fx_media_logical_sector_writes++; |
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#endif |
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/* Extended port-specific processing macro, which is by default defined to white space. */ |
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✓✓✓✓
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4467652 |
FX_UTILITY_LOGICAL_SECTOR_WRITE_EXTENSION |
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#ifndef FX_DISABLE_CACHE |
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/* Determine if the request is from the internal media buffer area. */ |
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✓✓ |
4463055 |
if ((((UCHAR *)buffer_ptr) >= media_ptr -> fx_media_memory_buffer) && |
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✓✓ |
4426074 |
(((UCHAR *)buffer_ptr) <= media_ptr -> fx_media_sector_cache_end)) |
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{ |
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/* Internal cache buffer is requested. */ |
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/* Determine if the logical sector cache access should use the hash function. */ |
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✓✓ |
4426063 |
if (media_ptr -> fx_media_sector_cache_hashed) |
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{ |
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/* Calculate the area of the cache for this logical sector. */ |
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2166735 |
index = (ULONG)(logical_sector & media_ptr -> fx_media_sector_cache_hash_mask) * FX_SECTOR_CACHE_DEPTH; |
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/* Build a pointer to the cache entry. */ |
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2166735 |
cache_entry = &(media_ptr -> fx_media_sector_cache[index]); |
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✓✓ |
8488147 |
for (i = 0; i < FX_SECTOR_CACHE_DEPTH; i++, cache_entry++) |
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{ |
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/* Determine if the logical sector is in the cache - assuming the depth of the |
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sector cache is 4 entries. */ |
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✓✓✓✓
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6907937 |
if ((cache_entry -> fx_cached_sector_valid) && (cache_entry -> fx_cached_sector == logical_sector)) |
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{ |
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586525 |
cache_found = FX_TRUE; |
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586525 |
break; |
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} |
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} |
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} |
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else |
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{ |
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/* Search for an entry in the cache that matches this request. */ |
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2259328 |
cache_size = media_ptr -> fx_media_sector_cache_size; |
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2259328 |
cache_entry = media_ptr -> fx_media_sector_cache_list_ptr; |
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/* Look at the cache entries until a match is found or the end of |
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the cache is reached. */ |
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✓✓ |
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while (cache_size--) |
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{ |
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/* Determine if the requested sector has been found. */ |
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✓✓✓✓
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404254132 |
if ((cache_entry -> fx_cached_sector_valid) && (cache_entry -> fx_cached_sector == logical_sector)) |
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{ |
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676589 |
cache_found = FX_TRUE; |
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676589 |
break; |
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} |
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/* Otherwise, we have not found the cached entry yet. */ |
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/* If there are more entries, move to the next one. */ |
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✓✓ |
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if (cache_entry -> fx_cached_sector_next_used) |
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{ |
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/* Move to the next cache entry. */ |
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cache_entry = cache_entry -> fx_cached_sector_next_used; |
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} |
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} |
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} |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
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if (media_ptr -> fx_media_fault_tolerant_enabled && |
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(media_ptr -> fx_media_fault_tolerant_state & FX_FAULT_TOLERANT_STATE_STARTED) && |
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(sector_type == FX_DATA_SECTOR) && |
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!(cache_found && (cache_entry -> fx_cached_sector_memory_buffer == buffer_ptr))) |
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{ |
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/* Special use case for file write when fault tolerant is enabled. */ |
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/* Data are read from one sector but write to another sector. */ |
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/* Need to invalidate both of original and new caches. */ |
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if (cache_found) |
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{ |
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/* Invalidate the new cache. */ |
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cache_entry -> fx_cached_sector_valid = FX_FALSE; |
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cache_found = FX_FALSE; |
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} |
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/* Search for original cache. */ |
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cache_size = media_ptr -> fx_media_sector_cache_size; |
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cache_entry = media_ptr -> fx_media_sector_cache_list_ptr; |
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/* Look at the cache entries until a match is found or the end of |
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the cache is reached. */ |
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while (cache_size--) |
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{ |
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/* Determine if the original sector has been found. */ |
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if ((cache_entry -> fx_cached_sector_valid) && |
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(cache_entry -> fx_cached_sector_memory_buffer == buffer_ptr)) |
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{ |
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/* Invalidate the original cache. */ |
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cache_entry -> fx_cached_sector_valid = FX_FALSE; |
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break; |
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} |
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/* Otherwise, we have not found the cached entry yet. */ |
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/* If there are more entries, move to the next one. */ |
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if (cache_entry -> fx_cached_sector_next_used) |
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{ |
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/* Move to the next cache entry. */ |
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cache_entry = cache_entry -> fx_cached_sector_next_used; |
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} |
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} |
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} |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
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✓✓ |
4426063 |
if (cache_found) |
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{ |
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/* Yes, we found a match. */ |
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#ifdef FX_FAULT_TOLERANT |
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/* Check for a system sector. Data sector fault tolerance is selected with |
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the FX_FAULT_TOLERANT_DATA option. */ |
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if (sector_type != FX_DATA_SECTOR) |
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{ |
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/* With the fault tolerant option enabled, system sectors are written immediately to |
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the media. */ |
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#ifndef FX_MEDIA_STATISTICS_DISABLE |
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/* Increment the number of driver write sector(s) requests. */ |
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media_ptr -> fx_media_driver_write_requests++; |
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#endif |
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/* Build write request to the driver. */ |
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media_ptr -> fx_media_driver_request = FX_DRIVER_WRITE; |
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media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
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media_ptr -> fx_media_driver_buffer = cache_entry -> fx_cached_sector_memory_buffer; |
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#ifdef FX_DRIVER_USE_64BIT_LBA |
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media_ptr -> fx_media_driver_logical_sector = logical_sector; |
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#else |
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media_ptr -> fx_media_driver_logical_sector = (ULONG)logical_sector; |
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#endif |
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media_ptr -> fx_media_driver_sectors = 1; |
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media_ptr -> fx_media_driver_sector_type = sector_type; |
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/* Yes, a system sector write is present so set the flag. The driver |
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can use this flag to make extra safeguards in writing the sector |
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out, yielding more fault tolerance. */ |
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media_ptr -> fx_media_driver_system_write = FX_TRUE; |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_WRITE, media_ptr, logical_sector, 1, cache_entry -> fx_cached_sector_memory_buffer, FX_TRACE_INTERNAL_EVENTS, 0, 0) |
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/* Invoke the driver to write the sector(s). */ |
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(media_ptr -> fx_media_driver_entry) (media_ptr); |
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/* Clear the system write flag. */ |
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media_ptr -> fx_media_driver_system_write = FX_FALSE; |
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/* Return success. */ |
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return(media_ptr -> fx_media_driver_status); |
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} |
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#endif |
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/* Determine if this is the first write of this logical sector. */ |
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✓✓ |
1263114 |
if (cache_entry -> fx_cached_sector_buffer_dirty == FX_FALSE) |
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{ |
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292 |
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/* Yes, increment the number of outstanding dirty sectors. */ |
293 |
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306017 |
media_ptr -> fx_media_sector_cache_dirty_count++; |
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/* Simply mark this entry as dirty. */ |
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306017 |
cache_entry -> fx_cached_sector_buffer_dirty = FX_TRUE; |
297 |
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} |
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299 |
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/* Don't bother updating the cache linked list since writes are |
300 |
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preceded by reads anyway. */ |
301 |
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302 |
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/* Success, return to caller immediately! */ |
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1263114 |
return(FX_SUCCESS); |
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} |
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307 |
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/* Okay, so if we are here the request must be for the additional FAT writes, since this is the |
308 |
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only time a write request is made without a preceding read request. */ |
309 |
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310 |
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/* Is the logical sector valid? */ |
311 |
✓✓✓✓
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3162949 |
if ((logical_sector == 0) || (logical_sector == ((ULONG)0xFFFFFFFF))) |
312 |
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{ |
313 |
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4 |
return(FX_SECTOR_INVALID); |
314 |
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} |
315 |
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316 |
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/* Compare logical sector against total sectors to make sure it is valid. */ |
317 |
✓✓ |
3162945 |
if ((logical_sector + sectors - 1) >= media_ptr -> fx_media_total_sectors) |
318 |
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{ |
319 |
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1 |
return(FX_SECTOR_INVALID); |
320 |
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} |
321 |
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322 |
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/* Just write the buffer to the media. */ |
323 |
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324 |
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#ifndef FX_MEDIA_STATISTICS_DISABLE |
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326 |
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/* Increment the number of driver write sector(s) requests. */ |
327 |
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3162944 |
media_ptr -> fx_media_driver_write_requests++; |
328 |
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#endif |
329 |
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330 |
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/* Build write request to the driver. */ |
331 |
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3162944 |
media_ptr -> fx_media_driver_request = FX_DRIVER_WRITE; |
332 |
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3162944 |
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
333 |
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3162944 |
media_ptr -> fx_media_driver_buffer = buffer_ptr; |
334 |
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#ifdef FX_DRIVER_USE_64BIT_LBA |
335 |
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media_ptr -> fx_media_driver_logical_sector = logical_sector; |
336 |
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#else |
337 |
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3162944 |
media_ptr -> fx_media_driver_logical_sector = (ULONG)logical_sector; |
338 |
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#endif |
339 |
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3162944 |
media_ptr -> fx_media_driver_sectors = sectors; |
340 |
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3162944 |
media_ptr -> fx_media_driver_sector_type = sector_type; |
341 |
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342 |
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/* Determine if the system write flag needs to be set. */ |
343 |
✓✓ |
3162944 |
if (sector_type != FX_DATA_SECTOR) |
344 |
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{ |
345 |
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346 |
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/* Yes, a system sector write is present so set the flag. The driver |
347 |
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can use this flag to make extra safeguards in writing the sector |
348 |
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out, yielding more fault tolerance. */ |
349 |
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3162853 |
media_ptr -> fx_media_driver_system_write = FX_TRUE; |
350 |
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} |
351 |
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352 |
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/* If trace is enabled, insert this event into the trace buffer. */ |
353 |
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FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_WRITE, media_ptr, logical_sector, sectors, buffer_ptr, FX_TRACE_INTERNAL_EVENTS, 0, 0) |
354 |
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355 |
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/* Invoke the driver to write the sector(s). */ |
356 |
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3162944 |
(media_ptr -> fx_media_driver_entry) (media_ptr); |
357 |
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358 |
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/* Clear the system write flag. */ |
359 |
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3162944 |
media_ptr -> fx_media_driver_system_write = FX_FALSE; |
360 |
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361 |
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/* Check for successful completion. */ |
362 |
✓✓ |
3162944 |
if (media_ptr -> fx_media_driver_status) |
363 |
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{ |
364 |
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365 |
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/* Error writing a internal sector out. Return the |
366 |
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error status. */ |
367 |
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1 |
return(media_ptr -> fx_media_driver_status); |
368 |
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} |
369 |
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370 |
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/* At this point, we have a successful write. */ |
371 |
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3162943 |
return(FX_SUCCESS); |
372 |
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} |
373 |
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else |
374 |
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#endif /* FX_DISABLE_CACHE */ |
375 |
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{ |
376 |
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377 |
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/* Otherwise, the write request is being made directly from an application |
378 |
|
|
buffer. Determine if the logical sector is valid. */ |
379 |
|
|
|
380 |
|
|
/* Is the logical sector valid? */ |
381 |
✓✓✓✓
|
36992 |
if ((logical_sector == 0) || (logical_sector == ((ULONG)0xFFFFFFFF))) |
382 |
|
|
{ |
383 |
|
4 |
return(FX_SECTOR_INVALID); |
384 |
|
|
} |
385 |
|
|
|
386 |
|
|
/* Compare logical sector against total sectors to make sure it is valid. */ |
387 |
✓✓ |
36988 |
if ((logical_sector + sectors - 1) >= media_ptr -> fx_media_total_sectors) |
388 |
|
|
{ |
389 |
|
3 |
return(FX_SECTOR_INVALID); |
390 |
|
|
} |
391 |
|
|
|
392 |
|
|
/* Flush and invalidate for any entries in the cache that are in this direct I/O read request range. */ |
393 |
|
36985 |
_fx_utility_logical_sector_flush(media_ptr, logical_sector, (ULONG64) sectors, FX_TRUE); |
394 |
|
|
|
395 |
|
|
#ifdef FX_DISABLE_CACHE |
396 |
|
|
if ((logical_sector <= media_ptr -> fx_media_memory_buffer_sector) && (logical_sector + sectors >= media_ptr -> fx_media_memory_buffer_sector)) |
397 |
|
|
{ |
398 |
|
|
media_ptr -> fx_media_memory_buffer_sector = (ULONG64)-1; |
399 |
|
|
} |
400 |
|
|
#endif /* FX_DISABLE_CACHE */ |
401 |
|
|
|
402 |
|
|
#ifndef FX_MEDIA_STATISTICS_DISABLE |
403 |
|
|
|
404 |
|
|
/* Increment the number of driver write sector(s) requests. */ |
405 |
|
36985 |
media_ptr -> fx_media_driver_write_requests++; |
406 |
|
|
#endif |
407 |
|
|
|
408 |
|
|
/* Build request to the driver. */ |
409 |
|
36985 |
media_ptr -> fx_media_driver_request = FX_DRIVER_WRITE; |
410 |
|
36985 |
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
411 |
|
36985 |
media_ptr -> fx_media_driver_buffer = buffer_ptr; |
412 |
|
|
#ifdef FX_DRIVER_USE_64BIT_LBA |
413 |
|
|
media_ptr -> fx_media_driver_logical_sector = logical_sector; |
414 |
|
|
#else |
415 |
|
36985 |
media_ptr -> fx_media_driver_logical_sector = (ULONG)logical_sector; |
416 |
|
|
#endif |
417 |
|
36985 |
media_ptr -> fx_media_driver_sectors = sectors; |
418 |
|
36985 |
media_ptr -> fx_media_driver_sector_type = sector_type; |
419 |
|
|
|
420 |
|
|
/* Determine if the system write flag needs to be set. */ |
421 |
✓✓ |
36985 |
if (sector_type != FX_DATA_SECTOR) |
422 |
|
|
{ |
423 |
|
|
|
424 |
|
|
/* Yes, a system sector write is present so set the flag. The driver |
425 |
|
|
can use this flag to make extra safeguards in writing the sector |
426 |
|
|
out, yielding more fault tolerance. */ |
427 |
|
2 |
media_ptr -> fx_media_driver_system_write = FX_TRUE; |
428 |
|
|
} |
429 |
|
|
|
430 |
|
|
/* If trace is enabled, insert this event into the trace buffer. */ |
431 |
|
|
FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_WRITE, media_ptr, logical_sector, sectors, buffer_ptr, FX_TRACE_INTERNAL_EVENTS, 0, 0) |
432 |
|
|
|
433 |
|
|
/* Invoke the driver to write the sector(s). */ |
434 |
|
36985 |
(media_ptr -> fx_media_driver_entry) (media_ptr); |
435 |
|
|
|
436 |
|
|
/* Clear the system write flag. */ |
437 |
|
36985 |
media_ptr -> fx_media_driver_system_write = FX_FALSE; |
438 |
|
|
|
439 |
|
|
/* Return driver status. */ |
440 |
|
36985 |
return(media_ptr -> fx_media_driver_status); |
441 |
|
|
} |
442 |
|
|
} |
443 |
|
|
|