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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** FileX Component */
/** */
/** Media */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#include "fx_media.h"
#include "fx_utility.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_media_cache_invalidate PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function examines the logical cache, flushing written sectors */
/* out to the media and invalidating all sectors in the logical cache. */
/* */
/* INPUT */
/* */
/* media_ptr Media control block pointer */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* _fx_utility_FAT_flush Flush cached FAT entries */
/* _fx_utility_FAT_map_flush Flush primary FAT changes to */
/* secondary FAT(s) */
/* _fx_utility_logical_sector_flush Flush logical sector cache */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _fx_media_cache_invalidate(FX_MEDIA *media_ptr)
{
UINT status;
UINT i;
#ifndef FX_MEDIA_STATISTICS_DISABLE
/* Increment the number of times this service has been called. */
media_ptr -> fx_media_flushes++;
#endif
/* Check the media to make sure it is open. */
if (media_ptr -> fx_media_id != FX_MEDIA_ID)
{
/* Return the media not opened error. */
return(FX_MEDIA_NOT_OPEN);
}
/* If trace is enabled, insert this event into the trace buffer. */
FX_TRACE_IN_LINE_INSERT(FX_TRACE_MEDIA_CACHE_INVALIDATE, media_ptr, 0, 0, 0, FX_TRACE_MEDIA_EVENTS, 0, 0)
/* Protect against other threads accessing the media. */
FX_PROTECT
/* Flush the cached individual FAT entries */
_fx_utility_FAT_flush(media_ptr);
/* Flush changed sector(s) in the primary FAT to secondary FATs. */
_fx_utility_FAT_map_flush(media_ptr);
/* Clear the FAT cache entry array. */
for (i = 0; i < FX_MAX_FAT_CACHE; i++)
{
/* Clear entry in the FAT cache. */
media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_cluster = 0;
media_ptr -> fx_media_fat_cache[i].fx_fat_cache_entry_value = 0;
}
/* Clear the secondary FAT update map. */
for (i = 0; i < FX_FAT_MAP_SIZE; i++)
{
/* Clear bit map entry for secondary FAT update. */
media_ptr -> fx_media_fat_secondary_update_map[i] = 0;
}
/* Call the logical sector flush to invalidate the logical sector cache. */
status = _fx_utility_logical_sector_flush(media_ptr, ((ULONG64) 1), (ULONG64) (media_ptr -> fx_media_total_sectors), FX_TRUE);
/* Release media protection. */
FX_UNPROTECT
/* If we get here, return successful status to the caller. */
return(status);
}