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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_logical_sector_flush PORTABLE C */ |
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/* 6.1.10 */ |
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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 flush requests for all FileX */ |
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/* components. It will process all dirty logical sectors in the */ |
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/* logical sector cache within the range specified. This function */ |
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/* optionally invalidates sectors. */ |
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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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/* starting_sector Starting sector number */ |
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/* sectors Number of sectors */ |
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/* invalidate Invalidate flag */ |
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/* (FX_TRUE -> invalidate) */ |
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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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/* 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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/* 01-31-2022 William E. Lamie Modified comment(s), fixed */ |
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/* errors without cache, */ |
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/* resulting in version 6.1.10 */ |
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/* */ |
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/**************************************************************************/ |
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4921077 |
UINT _fx_utility_logical_sector_flush(FX_MEDIA *media_ptr, ULONG64 starting_sector, ULONG64 sectors, UINT invalidate) |
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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 i, bit_set, use_starting_sector; |
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ULONG index; |
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ULONG remaining_valid; |
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ULONG remaining_dirty; |
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ULONG64 ending_sector; |
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ULONG valid_bit_map; |
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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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4921077 |
FX_UTILITY_LOGICAL_SECTOR_FLUSH_EXTENSION |
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/* Calculate the ending sector. */ |
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4921075 |
ending_sector = starting_sector + sectors - 1; |
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/* Pickup the number of dirty sectors currently in the cache. */ |
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4921075 |
remaining_dirty = media_ptr -> fx_media_sector_cache_dirty_count; |
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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_MEDIA_FLUSH, media_ptr, media_ptr -> fx_media_sector_cache_dirty_count, 0, 0, FX_TRACE_INTERNAL_EVENTS, 0, 0) |
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/* Determine what type of cache configuration we have. */ |
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✓✓ |
4921075 |
if (media_ptr -> fx_media_sector_cache_hashed == FX_FALSE) |
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{ |
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/* Linear cache present, simply walk through the search list until |
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an unused cache entry is present. */ |
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/* Flush and invalidate the internal logical sector cache. */ |
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4572446 |
cache_size = media_ptr -> fx_media_sector_cache_size; |
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4572446 |
cache_entry = media_ptr -> fx_media_sector_cache_list_ptr; |
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/* Look at the cache entries that have been written to. */ |
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✓✓✓✓
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9133941 |
while ((cache_size--) && (cache_entry -> fx_cached_sector)) |
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{ |
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/* Determine if invalidation is not required and there are no |
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more dirty sectors. */ |
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✓✓✓✓
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4595678 |
if ((remaining_dirty == 0) && (invalidate == FX_FALSE)) |
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{ |
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/* Yes, nothing left to do. */ |
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14546 |
break; |
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} |
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/* Determine if there are any more sectors to process. */ |
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✓✓ |
4581132 |
if (sectors == 0) |
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{ |
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/* No more sectors required to process. */ |
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break; |
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} |
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/* Determine if this cached sector is within the specified range and is valid. */ |
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✓✓ |
4581002 |
if ((cache_entry -> fx_cached_sector_valid) && |
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✓✓ |
1020587 |
(cache_entry -> fx_cached_sector >= starting_sector) && |
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✓✓ |
985809 |
(cache_entry -> fx_cached_sector <= ending_sector)) |
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{ |
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/* Yes, the cache entry is valid and within the specified range. Determine if |
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the requested sector has been written to. */ |
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✓✓ |
974058 |
if (cache_entry -> fx_cached_sector_buffer_dirty) |
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{ |
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/* Yes, write the cached sector out to the media. */ |
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/* Check for write protect at the media level (set by driver). */ |
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✓✓ |
84232 |
if (media_ptr -> fx_media_driver_write_protect == FX_FALSE) |
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{ |
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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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83977 |
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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83977 |
media_ptr -> fx_media_driver_request = FX_DRIVER_WRITE; |
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83977 |
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
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83977 |
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 = cache_entry -> fx_cached_sector; |
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#else |
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83977 |
media_ptr -> fx_media_driver_logical_sector = (ULONG)cache_entry -> fx_cached_sector; |
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#endif |
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83977 |
media_ptr -> fx_media_driver_sectors = 1; |
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83977 |
media_ptr -> fx_media_driver_sector_type = cache_entry -> fx_cached_sector_type; |
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/* Sectors other than FX_DATA_SECTOR will never be dirty when FX_FAULT_TOLERANT is defined. */ |
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#ifndef FX_FAULT_TOLERANT |
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/* Determine if the system write flag needs to be set. */ |
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✓✓ |
83977 |
if (cache_entry -> fx_cached_sector_type != FX_DATA_SECTOR) |
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{ |
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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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83244 |
media_ptr -> fx_media_driver_system_write = FX_TRUE; |
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} |
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#endif /* FX_FAULT_TOLERANT */ |
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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, cache_entry -> fx_cached_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. */ |
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83977 |
(media_ptr -> fx_media_driver_entry) (media_ptr); |
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/* Clear the system write flag. */ |
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83977 |
media_ptr -> fx_media_driver_system_write = FX_FALSE; |
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/* Check for successful completion. */ |
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✓✓ |
83977 |
if (media_ptr -> fx_media_driver_status) |
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{ |
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/* Error writing a cached sector out. Return the |
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error status. */ |
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19507 |
return(media_ptr -> fx_media_driver_status); |
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} |
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/* Clear the buffer dirty flag since it has been flushed |
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out. */ |
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64470 |
cache_entry -> fx_cached_sector_buffer_dirty = FX_FALSE; |
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/* Decrement the number of dirty sectors currently in the cache. */ |
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64470 |
media_ptr -> fx_media_sector_cache_dirty_count--; |
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64470 |
remaining_dirty--; |
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} |
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} |
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/* Determine if the invalidate option is specified. */ |
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✓✓ |
954551 |
if (invalidate) |
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{ |
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/* Invalidate the cache entry. */ |
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949378 |
cache_entry -> fx_cached_sector_valid = FX_FALSE; |
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/* Place all ones in the sector number. */ |
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949378 |
cache_entry -> fx_cached_sector = (~(ULONG64)0); |
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/* Determine if this sector is still dirty, this could be the case if |
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write protection was turned on. */ |
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✓✓ |
949378 |
if (cache_entry -> fx_cached_sector_buffer_dirty) |
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{ |
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232 |
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/* Yes, clear the dirty flag. */ |
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255 |
cache_entry -> fx_cached_sector_buffer_dirty = FX_FALSE; |
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235 |
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/* Decrement the number of dirty sectors currently in the cache. */ |
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255 |
media_ptr -> fx_media_sector_cache_dirty_count--; |
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remaining_dirty--; |
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} |
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} |
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/* Decrement the number of sectors in the range that have been processed. */ |
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954551 |
sectors--; |
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} |
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/* Move to the next entry in the sector cache. */ |
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4561495 |
cache_entry = cache_entry -> fx_cached_sector_next_used; |
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} |
248 |
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} |
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else |
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{ |
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252 |
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/* Hashed cache is present. Pickup the cache size. */ |
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348629 |
cache_size = media_ptr -> fx_media_sector_cache_size; |
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255 |
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/* Initialize the loop control parameters. */ |
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348629 |
bit_set = 0; |
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348629 |
valid_bit_map = media_ptr -> fx_media_sector_cache_hashed_sector_valid; |
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259 |
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/* Determine how to process the hashed cache based on the number of sectors |
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to process. If the sequential sector range is less than the bit map size, |
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simply use the starting sector to derive the index into the cache. */ |
262 |
✓✓ |
348629 |
if (sectors < 32) |
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{ |
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14673 |
use_starting_sector = FX_TRUE; |
265 |
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} |
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else |
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{ |
268 |
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333956 |
use_starting_sector = FX_FALSE; |
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} |
270 |
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271 |
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/* Determine if there is anything valid in the cache. */ |
272 |
✓✓ |
8306440 |
while (valid_bit_map) |
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{ |
274 |
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275 |
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/* Determine if invalidation is not required and there are no |
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more dirty sectors. */ |
277 |
✓✓✓✓
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7976120 |
if ((remaining_dirty == 0) && (invalidate == FX_FALSE)) |
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{ |
279 |
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280 |
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/* Yes, nothing left to do. */ |
281 |
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4062 |
break; |
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} |
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284 |
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/* Determine if there are any more sectors to process. */ |
285 |
✓✓✓✓
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7972058 |
if ((sectors == 0) || (starting_sector > ending_sector)) |
286 |
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{ |
287 |
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288 |
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/* No more sectors required to process. */ |
289 |
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break; |
290 |
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} |
291 |
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292 |
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/* Determine how to compute the hash index. */ |
293 |
✓✓ |
7957814 |
if (use_starting_sector) |
294 |
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{ |
295 |
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296 |
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/* Calculate the hash value of this sector using the lower bits. */ |
297 |
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18480 |
index = (ULONG)(starting_sector & media_ptr -> fx_media_sector_cache_hash_mask); |
298 |
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299 |
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/* Calculate the bit set indicating there is one or more valid sectors at this cache index. */ |
300 |
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18480 |
bit_set = (index % 32); |
301 |
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302 |
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/* Compute the actual array index by multiplying by the cache depth. */ |
303 |
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18480 |
index = (bit_set * FX_SECTOR_CACHE_DEPTH); |
304 |
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} |
305 |
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else |
306 |
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{ |
307 |
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308 |
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/* Walk the bit map to find the next valid entry. */ |
309 |
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310 |
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/* Find the next set bit. */ |
311 |
✓✓ |
10367994 |
while ((valid_bit_map & 1) == 0) |
312 |
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{ |
313 |
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314 |
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/* Otherwise, shift down the bit in the bit map. */ |
315 |
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2428660 |
valid_bit_map = valid_bit_map >> 1; |
316 |
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317 |
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/* Increment the set bit marker. */ |
318 |
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2428660 |
bit_set++; |
319 |
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} |
320 |
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321 |
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/* Compute the first actual index into the hashed cache. */ |
322 |
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7939334 |
index = (bit_set * FX_SECTOR_CACHE_DEPTH); |
323 |
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} |
324 |
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325 |
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/* At this point, bit_set represents the next group of hashed sectors that could |
326 |
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have valid cache entries and index represents the index into the sector cache |
327 |
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of that sector group. */ |
328 |
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329 |
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/* Clear the remaining valid sectors for this entry in the bit map. */ |
330 |
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7957814 |
remaining_valid = 0; |
331 |
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332 |
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/* Loop to check the corresponding hash entries. */ |
333 |
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do |
334 |
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{ |
335 |
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336 |
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/* Setup pointer to the cache entry. */ |
337 |
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15758544 |
cache_entry = &(media_ptr -> fx_media_sector_cache[index]); |
338 |
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339 |
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/* Loop to examine the full depth of the hashed cache. */ |
340 |
✓✓ |
78745050 |
for (i = 0; i < 4; i++) |
341 |
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{ |
342 |
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343 |
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/* Determine if this cached sector is within the specified range and is valid. */ |
344 |
✓✓ |
62998753 |
if ((cache_entry -> fx_cached_sector_valid) && |
345 |
✓✓ |
8918284 |
(cache_entry -> fx_cached_sector >= starting_sector) && |
346 |
✓✓ |
159236 |
(cache_entry -> fx_cached_sector <= ending_sector)) |
347 |
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{ |
348 |
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349 |
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/* Determine if the requested sector has been written to. */ |
350 |
✓✓ |
149707 |
if (cache_entry -> fx_cached_sector_buffer_dirty) |
351 |
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{ |
352 |
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353 |
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354 |
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/* Yes, write the cached sector out to the media. */ |
355 |
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|
356 |
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/* Check for write protect at the media level (set by driver). */ |
357 |
✓✓ |
29717 |
if (media_ptr -> fx_media_driver_write_protect == FX_FALSE) |
358 |
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{ |
359 |
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360 |
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#ifndef FX_MEDIA_STATISTICS_DISABLE |
361 |
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362 |
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/* Increment the number of driver write sector(s) requests. */ |
363 |
|
29461 |
media_ptr -> fx_media_driver_write_requests++; |
364 |
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#endif |
365 |
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366 |
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/* Build Write request to the driver. */ |
367 |
|
29461 |
media_ptr -> fx_media_driver_request = FX_DRIVER_WRITE; |
368 |
|
29461 |
media_ptr -> fx_media_driver_status = FX_IO_ERROR; |
369 |
|
29461 |
media_ptr -> fx_media_driver_buffer = cache_entry -> fx_cached_sector_memory_buffer; |
370 |
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#ifdef FX_DRIVER_USE_64BIT_LBA |
371 |
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media_ptr -> fx_media_driver_logical_sector = cache_entry -> fx_cached_sector; |
372 |
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#else |
373 |
|
29461 |
media_ptr -> fx_media_driver_logical_sector = (ULONG)cache_entry -> fx_cached_sector; |
374 |
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#endif |
375 |
|
29461 |
media_ptr -> fx_media_driver_sectors = 1; |
376 |
|
29461 |
media_ptr -> fx_media_driver_sector_type = cache_entry -> fx_cached_sector_type; |
377 |
|
|
|
378 |
|
|
/* Sectors other than FX_DATA_SECTOR will never be dirty when FX_FAULT_TOLERANT is defined. */ |
379 |
|
|
#ifndef FX_FAULT_TOLERANT |
380 |
|
|
/* Determine if the system write flag needs to be set. */ |
381 |
✓✓ |
29461 |
if (cache_entry -> fx_cached_sector_type != FX_DATA_SECTOR) |
382 |
|
|
{ |
383 |
|
|
|
384 |
|
|
/* Yes, a system sector write is present so set the flag. The driver |
385 |
|
|
can use this flag to make extra safeguards in writing the sector |
386 |
|
|
out, yielding more fault tolerance. */ |
387 |
|
14060 |
media_ptr -> fx_media_driver_system_write = FX_TRUE; |
388 |
|
|
} |
389 |
|
|
#endif /* FX_FAULT_TOLERANT */ |
390 |
|
|
|
391 |
|
|
/* If trace is enabled, insert this event into the trace buffer. */ |
392 |
|
|
FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_WRITE, media_ptr, cache_entry -> fx_cached_sector, 1, cache_entry -> fx_cached_sector_memory_buffer, FX_TRACE_INTERNAL_EVENTS, 0, 0) |
393 |
|
|
|
394 |
|
|
/* Invoke the driver to write the sector. */ |
395 |
|
29461 |
(media_ptr -> fx_media_driver_entry) (media_ptr); |
396 |
|
|
|
397 |
|
|
/* Clear the system write flag. */ |
398 |
|
29461 |
media_ptr -> fx_media_driver_system_write = FX_FALSE; |
399 |
|
|
|
400 |
|
|
/* Check for successful completion. */ |
401 |
✓✓ |
29461 |
if (media_ptr -> fx_media_driver_status) |
402 |
|
|
{ |
403 |
|
|
|
404 |
|
|
/* Error writing a cached sector out. Return the |
405 |
|
|
error status. */ |
406 |
|
3 |
return(media_ptr -> fx_media_driver_status); |
407 |
|
|
} |
408 |
|
|
|
409 |
|
|
/* Clear the buffer dirty flag since it has been flushed |
410 |
|
|
out. */ |
411 |
|
29458 |
cache_entry -> fx_cached_sector_buffer_dirty = FX_FALSE; |
412 |
|
|
|
413 |
|
|
/* Decrement the number of dirty sectors currently in the cache. */ |
414 |
|
29458 |
media_ptr -> fx_media_sector_cache_dirty_count--; |
415 |
|
29458 |
remaining_dirty--; |
416 |
|
|
} |
417 |
|
|
} |
418 |
|
|
|
419 |
|
|
/* Determine if the invalidate option is specified. */ |
420 |
✓✓ |
149704 |
if (invalidate) |
421 |
|
|
{ |
422 |
|
|
|
423 |
|
|
/* Invalidate the cache entry. */ |
424 |
|
77399 |
cache_entry -> fx_cached_sector_valid = FX_FALSE; |
425 |
|
|
|
426 |
|
|
/* Place all ones in the sector number. */ |
427 |
|
77399 |
cache_entry -> fx_cached_sector = (~(ULONG64)0); |
428 |
|
|
|
429 |
|
|
/* Determine if this sector is still dirty, this could be the case if |
430 |
|
|
write protection was turned on. */ |
431 |
✓✓ |
77399 |
if (cache_entry -> fx_cached_sector_buffer_dirty) |
432 |
|
|
{ |
433 |
|
|
|
434 |
|
|
/* Yes, clear the dirty flag. */ |
435 |
|
256 |
cache_entry -> fx_cached_sector_buffer_dirty = FX_FALSE; |
436 |
|
|
|
437 |
|
|
/* Decrement the number of dirty sectors currently in the cache. */ |
438 |
|
256 |
media_ptr -> fx_media_sector_cache_dirty_count--; |
439 |
|
256 |
remaining_dirty--; |
440 |
|
|
} |
441 |
|
|
} |
442 |
|
|
|
443 |
|
|
/* Decrement the number of sectors in the range that have been processed. */ |
444 |
|
149704 |
sectors--; |
445 |
|
|
} |
446 |
|
|
else |
447 |
|
|
{ |
448 |
|
|
|
449 |
|
|
/* Determine if the sector is valid. */ |
450 |
✓✓ |
62849046 |
if (cache_entry -> fx_cached_sector_valid) |
451 |
|
|
{ |
452 |
|
|
|
453 |
|
|
/* Increment the number of still remaining but out of range sectors. */ |
454 |
|
8768577 |
remaining_valid++; |
455 |
|
|
} |
456 |
|
|
} |
457 |
|
|
|
458 |
|
|
/* Determine if invalidation is not required and there are no |
459 |
|
|
more dirty sectors. */ |
460 |
✓✓✓✓
|
62998750 |
if ((remaining_dirty == 0) && (invalidate == FX_FALSE)) |
461 |
|
|
{ |
462 |
|
|
|
463 |
|
|
/* Yes, nothing left to do. */ |
464 |
|
12153 |
break; |
465 |
|
|
} |
466 |
|
|
|
467 |
|
|
/* Determine if there are any more sectors to process. */ |
468 |
✓✓✓✓
|
62986597 |
if ((sectors == 0) && (invalidate == FX_FALSE)) |
469 |
|
|
{ |
470 |
|
|
|
471 |
|
|
/* No more sectors required to process. */ |
472 |
|
91 |
break; |
473 |
|
|
} |
474 |
|
|
|
475 |
|
|
/* Move to the next cache entry. */ |
476 |
|
62986506 |
cache_entry++; |
477 |
|
|
} |
478 |
|
|
|
479 |
|
|
/* Move the index to the next position since the bit map can only represent 32 |
480 |
|
|
cache entries. */ |
481 |
|
15758541 |
index = index + (32 * FX_SECTOR_CACHE_DEPTH); |
482 |
✓✓ |
15758541 |
} while (index < cache_size); |
483 |
|
|
|
484 |
|
|
/* Determine if invalidation was required and there are no more valid sectors |
485 |
|
|
associated with this bit position. */ |
486 |
✓✓✓✓
|
7957811 |
if ((invalidate) && (remaining_valid == 0)) |
487 |
|
|
{ |
488 |
|
|
|
489 |
|
|
/* Clear this bit position. */ |
490 |
|
72608 |
media_ptr -> fx_media_sector_cache_hashed_sector_valid &= ~(((ULONG)1) << bit_set); |
491 |
|
|
} |
492 |
|
|
|
493 |
|
|
/* Determine if the starting sector is being used for examination of the hash. */ |
494 |
✓✓ |
7957811 |
if (use_starting_sector) |
495 |
|
|
{ |
496 |
|
|
|
497 |
|
|
/* Move to the next sector. */ |
498 |
|
18480 |
starting_sector++; |
499 |
|
|
} |
500 |
|
|
else |
501 |
|
|
{ |
502 |
|
|
|
503 |
|
|
/* Move to next bit in the map. */ |
504 |
|
7939331 |
valid_bit_map = valid_bit_map >> 1; |
505 |
|
|
|
506 |
|
|
/* Increment the set bit marker. */ |
507 |
|
7939331 |
bit_set++; |
508 |
|
|
} |
509 |
|
|
} |
510 |
|
|
} |
511 |
|
|
#else |
512 |
|
|
FX_PARAMETER_NOT_USED(media_ptr); |
513 |
|
|
FX_PARAMETER_NOT_USED(starting_sector); |
514 |
|
|
FX_PARAMETER_NOT_USED(sectors); |
515 |
|
|
FX_PARAMETER_NOT_USED(invalidate); |
516 |
|
|
#endif /* FX_DISABLE_CACHE */ |
517 |
|
|
|
518 |
|
|
/* If we get here, return successful status to the caller. */ |
519 |
|
4901565 |
return(FX_SUCCESS); |
520 |
|
|
} |
521 |
|
|
|