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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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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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/** Media */ |
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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_media.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_media_cache_invalidate PORTABLE C */ |
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/* 6.1 */ |
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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 examines the logical cache, flushing written sectors */ |
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/* out to the media and invalidating all sectors in the logical cache. */ |
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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_FAT_flush Flush cached FAT entries */ |
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/* _fx_utility_FAT_map_flush Flush primary FAT changes to */ |
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/* secondary FAT(s) */ |
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/* _fx_utility_logical_sector_flush Flush logical sector cache */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application Code */ |
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/* */ |
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/**************************************************************************/ |
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UINT _fx_media_cache_invalidate(FX_MEDIA *media_ptr) |
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{ |
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UINT status; |
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UINT i; |
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#ifndef FX_MEDIA_STATISTICS_DISABLE |
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/* Increment the number of times this service has been called. */ |
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media_ptr -> fx_media_flushes++; |
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#endif |
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/* Check the media to make sure it is open. */ |
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✓✓ |
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if (media_ptr -> fx_media_id != FX_MEDIA_ID) |
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{ |
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/* Return the media not opened error. */ |
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return(FX_MEDIA_NOT_OPEN); |
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} |
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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_MEDIA_CACHE_INVALIDATE, media_ptr, 0, 0, 0, FX_TRACE_MEDIA_EVENTS, 0, 0) |
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/* Protect against other threads accessing the media. */ |
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FX_PROTECT |
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/* Flush the cached individual FAT entries */ |
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_fx_utility_FAT_flush(media_ptr); |
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/* Flush changed sector(s) in the primary FAT to secondary FATs. */ |
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_fx_utility_FAT_map_flush(media_ptr); |
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/* Clear the FAT cache entry array. */ |
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✓✓ |
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for (i = 0; i < FX_MAX_FAT_CACHE; i++) |
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{ |
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/* Clear entry in the FAT cache. */ |
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media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_cluster = 0; |
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media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_value = 0; |
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} |
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/* Clear the secondary FAT update map. */ |
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✓✓ |
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for (i = 0; i < FX_FAT_MAP_SIZE; i++) |
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{ |
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/* Clear bit map entry for secondary FAT update. */ |
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media_ptr -> fx_media_fat_secondary_update_map[i] = 0; |
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} |
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/* Call the logical sector flush to invalidate the logical sector cache. */ |
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status = _fx_utility_logical_sector_flush(media_ptr, ((ULONG64) 1), (ULONG64) (media_ptr -> fx_media_total_sectors), FX_TRUE); |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* If we get here, return successful status to the caller. */ |
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return(status); |
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} |
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