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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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/** File */ |
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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_file.h" |
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#include "fx_utility.h" |
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#include "fx_directory.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_file_extended_allocate 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 attempts to allocate the number of consecutive */ |
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/* clusters required to satisfy the user's request. If there are */ |
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/* enough clusters, the clusters are allocated and linked to the file. */ |
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/* Otherwise, if there are not enough consecutive clusters, an error */ |
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/* code is returned to the caller. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* file_ptr File control block pointer */ |
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/* size Number of bytes to allocate */ |
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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_directory_entry_write Update directory entry */ |
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/* _fx_utility_FAT_entry_read Read a FAT entry */ |
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/* _fx_utility_FAT_entry_write Write a FAT entry */ |
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/* _fx_utility_FAT_flush Flush written FAT entries */ |
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/* _fx_utility_logical_sector_flush Flush the written log sector */ |
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/* _fx_fault_tolerant_transaction_start Start fault tolerant */ |
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/* transaction */ |
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/* _fx_fault_tolerant_transaction_end End fault tolerant transaction*/ |
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/* _fx_fault_tolerant_recover Recover FAT chain */ |
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/* _fx_fault_tolerant_reset_log_file Reset the log file */ |
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/* _fx_fault_tolerant_set_FAT_chain Set data of FAT chain */ |
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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_file_extended_allocate(FX_FILE *file_ptr, ULONG64 size) |
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{ |
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UINT status; |
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ULONG i; |
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UINT found; |
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ULONG bytes_per_cluster; |
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ULONG FAT_index; |
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ULONG FAT_value; |
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ULONG clusters; |
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FX_MEDIA *media_ptr; |
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#ifdef TX_ENABLE_EVENT_TRACE |
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TX_TRACE_BUFFER_ENTRY *trace_event; |
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ULONG trace_timestamp; |
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#endif |
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/* First, determine if the file is still open. */ |
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✓✓ |
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if (file_ptr -> fx_file_id != FX_FILE_ID) |
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{ |
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/* Return the file not open error status. */ |
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return(FX_NOT_OPEN); |
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} |
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/* Setup pointer to media structure. */ |
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media_ptr = file_ptr -> fx_file_media_ptr; |
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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_file_allocates++; |
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#endif |
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/* Make sure this file is open for writing. */ |
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✓✓ |
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if (file_ptr -> fx_file_open_mode != FX_OPEN_FOR_WRITE) |
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{ |
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/* Return the access error exception - a write was attempted from |
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a file opened for reading! */ |
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return(FX_ACCESS_ERROR); |
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} |
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/* Determine if the requested allocation is for zero bytes. */ |
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✓✓ |
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if (size == 0) |
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{ |
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/* Return a successful completion - nothing needs to be done. */ |
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return(FX_SUCCESS); |
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} |
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/* Setup pointer to associated media control block. */ |
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media_ptr = file_ptr -> fx_file_media_ptr; |
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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_FILE_ALLOCATE, file_ptr, size, file_ptr -> fx_file_current_available_size, 0, FX_TRACE_FILE_EVENTS, &trace_event, &trace_timestamp) |
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/* Protect against other threads accessing the media. */ |
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FX_PROTECT |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
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/* Start transaction. */ |
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_fx_fault_tolerant_transaction_start(media_ptr); |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
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/* Check for write protect at the media level (set by driver). */ |
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✓✓ |
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if (media_ptr -> fx_media_driver_write_protect) |
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{ |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Return write protect error. */ |
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return(FX_WRITE_PROTECT); |
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} |
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/* Calculate the number of bytes per cluster. */ |
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bytes_per_cluster = ((ULONG)media_ptr -> fx_media_bytes_per_sector) * |
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((ULONG)media_ptr -> fx_media_sectors_per_cluster); |
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/* Check for invalid value. */ |
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✓✓ |
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if (bytes_per_cluster == 0) |
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{ |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Invalid media, return error. */ |
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return(FX_MEDIA_INVALID); |
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} |
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/* Calculate the number of consecutive clusters needed to satisfy this |
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request. */ |
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clusters = (ULONG)(((size + bytes_per_cluster - 1) / bytes_per_cluster)); |
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/* Determine if cluster count is 0. */ |
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✓✓ |
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if (clusters == 0) |
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{ |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Size overflow when rounding to the next cluster, return an error status. */ |
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return(FX_NO_MORE_SPACE); |
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} |
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/* Determine if there are enough available clusters on the media. */ |
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✓✓ |
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if (clusters > media_ptr -> fx_media_available_clusters) |
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{ |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Not enough clusters, return an error status. */ |
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return(FX_NO_MORE_SPACE); |
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} |
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/* Determine if the requested file allocation would exceed the physical limit of the file. */ |
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✓✓ |
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if (((file_ptr -> fx_file_current_available_size + (((ULONG64) clusters) * ((ULONG64) bytes_per_cluster))) < file_ptr -> fx_file_current_available_size) || |
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✓✓ |
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((file_ptr -> fx_file_current_available_size + (((ULONG64) clusters) * ((ULONG64) bytes_per_cluster))) > 0xFFFFFFFFULL)) |
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{ |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Return the no more space error, since the new file size would be larger than |
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the 32-bit field to represent it in the file's directory entry. */ |
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return(FX_NO_MORE_SPACE); |
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} |
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/* Now we need to find the consecutive clusters. */ |
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FAT_index = FX_FAT_ENTRY_START; |
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found = FX_FALSE; |
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✓✓ |
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while (FAT_index <= (media_ptr -> fx_media_total_clusters - clusters + FX_FAT_ENTRY_START)) |
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{ |
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/* Determine if enough consecutive FAT entries are available. */ |
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i = 0; |
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do |
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{ |
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/* Read a FAT entry. */ |
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status = _fx_utility_FAT_entry_read(media_ptr, (FAT_index + i), &FAT_value); |
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/* Check for a successful status. */ |
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✓✓ |
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if (status != FX_SUCCESS) |
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{ |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
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/* Release media protection. */ |
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FX_UNPROTECT |
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/* Return the error status. */ |
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return(status); |
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} |
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/* Determine if the entry is free. */ |
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✓✓ |
7223 |
if (FAT_value != FX_FREE_CLUSTER) |
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{ |
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6939 |
break; |
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} |
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/* Otherwise, increment the consecutive FAT indices. */ |
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i++; |
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✓✓ |
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} while (i < clusters); |
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/* Determine if we found enough FAT entries. */ |
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✓✓ |
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if (i >= clusters) |
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{ |
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/* Yes, we have found enough FAT entries - set the found |
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flag and get out of this loop. */ |
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found = FX_TRUE; |
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break; |
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} |
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else |
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{ |
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/* Position to the next possibly free FAT entry. */ |
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FAT_index = FAT_index + i + 1; |
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} |
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} |
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/* Determine if we found enough consecutive clusters to satisfy the |
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request. */ |
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✓✓ |
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if (found) |
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{ |
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299 |
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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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{ |
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/* Record the action that is about to take place. This information |
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would aid the undo process should fault condition happens. */ |
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media_ptr -> fx_media_fault_tolerant_state |= FX_FAULT_TOLERANT_STATE_SET_FAT_CHAIN; |
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_fx_fault_tolerant_set_FAT_chain(media_ptr, FX_FALSE, file_ptr -> fx_file_last_physical_cluster, |
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FAT_index, media_ptr -> fx_media_fat_last, media_ptr -> fx_media_fat_last); |
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} |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
310 |
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311 |
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312 |
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/* Update the link pointers in the new clusters. */ |
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✓✓ |
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for (i = 0; i < (clusters - 1); i++) |
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{ |
315 |
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316 |
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/* Update the cluster links. Since the allocation is |
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sequential, we just have to link each FAT entry to the |
318 |
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next one. */ |
319 |
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status = _fx_utility_FAT_entry_write(media_ptr, FAT_index + i, FAT_index + i + 1); |
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321 |
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/* Check for a bad status. */ |
322 |
✓✓ |
265 |
if (status != FX_SUCCESS) |
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{ |
324 |
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325 |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
326 |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
327 |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
328 |
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329 |
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/* Release media protection. */ |
330 |
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1 |
FX_UNPROTECT |
331 |
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332 |
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/* Return the error status. */ |
333 |
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1 |
return(status); |
334 |
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} |
335 |
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} |
336 |
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337 |
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/* Now place an EOF in the last cluster entry. */ |
338 |
|
15 |
status = _fx_utility_FAT_entry_write(media_ptr, FAT_index + clusters - 1, media_ptr -> fx_media_fat_last); |
339 |
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340 |
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/* Check for a bad status. */ |
341 |
✓✓ |
15 |
if (status != FX_SUCCESS) |
342 |
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{ |
343 |
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344 |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
345 |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
346 |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
347 |
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348 |
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/* Release media protection. */ |
349 |
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1 |
FX_UNPROTECT |
350 |
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351 |
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/* Return the error status. */ |
352 |
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1 |
return(status); |
353 |
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} |
354 |
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355 |
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#ifdef FX_FAULT_TOLERANT |
356 |
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357 |
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/* Flush the cached individual FAT entries */ |
358 |
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_fx_utility_FAT_flush(media_ptr); |
359 |
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360 |
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#endif |
361 |
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362 |
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/* Actually link up the new clusters to the file. */ |
363 |
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364 |
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/* Determine if there are already clusters allocated for this file. */ |
365 |
✓✓ |
14 |
if (file_ptr -> fx_file_total_clusters) |
366 |
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{ |
367 |
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368 |
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/* Linkup the last cluster. */ |
369 |
|
7 |
status = _fx_utility_FAT_entry_write(media_ptr, |
370 |
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file_ptr -> fx_file_last_physical_cluster, FAT_index); |
371 |
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372 |
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/* Check for a bad status. */ |
373 |
✓✓ |
7 |
if (status != FX_SUCCESS) |
374 |
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{ |
375 |
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376 |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
377 |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
378 |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
379 |
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380 |
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/* Release media protection. */ |
381 |
|
1 |
FX_UNPROTECT |
382 |
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383 |
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/* Return the error status. */ |
384 |
|
1 |
return(status); |
385 |
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} |
386 |
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387 |
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/* Determine if we are adding a sector after a write filled the previously |
388 |
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allocated cluster exactly. */ |
389 |
|
6 |
if ((file_ptr -> fx_file_current_relative_sector >= |
390 |
✓✓ |
6 |
(media_ptr -> fx_media_sectors_per_cluster - 1)) && |
391 |
|
5 |
(file_ptr -> fx_file_current_logical_offset >= |
392 |
✓✓ |
5 |
media_ptr -> fx_media_bytes_per_sector)) |
393 |
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{ |
394 |
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|
|
395 |
|
|
/* Yes, we need to adjust all of the pertinent file parameters for |
396 |
|
|
access into this newly allocated cluster. */ |
397 |
|
3 |
file_ptr -> fx_file_current_physical_cluster = FAT_index; |
398 |
|
3 |
file_ptr -> fx_file_current_relative_cluster++; |
399 |
|
3 |
file_ptr -> fx_file_current_relative_sector = 0; |
400 |
|
3 |
file_ptr -> fx_file_current_logical_sector = ((ULONG)media_ptr -> fx_media_data_sector_start) + |
401 |
|
3 |
(((ULONG64)(FAT_index - FX_FAT_ENTRY_START)) * |
402 |
|
3 |
((ULONG)media_ptr -> fx_media_sectors_per_cluster)); |
403 |
|
3 |
file_ptr -> fx_file_current_logical_offset = 0; |
404 |
|
|
} |
405 |
|
|
} |
406 |
|
|
else |
407 |
|
|
{ |
408 |
|
|
|
409 |
|
|
/* These new clusters are also the first! Setup the initial |
410 |
|
|
file parameters. */ |
411 |
|
7 |
file_ptr -> fx_file_first_physical_cluster = FAT_index; |
412 |
|
7 |
file_ptr -> fx_file_current_physical_cluster = file_ptr -> fx_file_first_physical_cluster; |
413 |
|
7 |
file_ptr -> fx_file_current_relative_cluster = 0; |
414 |
|
7 |
file_ptr -> fx_file_current_logical_sector = ((ULONG)media_ptr -> fx_media_data_sector_start) + |
415 |
|
7 |
(((ULONG64)(file_ptr -> fx_file_first_physical_cluster - FX_FAT_ENTRY_START)) * |
416 |
|
7 |
((ULONG)media_ptr -> fx_media_sectors_per_cluster)); |
417 |
|
7 |
file_ptr -> fx_file_current_logical_offset = 0; |
418 |
|
7 |
file_ptr -> fx_file_current_file_offset = 0; |
419 |
|
|
|
420 |
|
|
/* Update the first cluster in the directory entry. */ |
421 |
|
7 |
file_ptr -> fx_file_dir_entry.fx_dir_entry_cluster = FAT_index; |
422 |
|
|
} |
423 |
|
|
|
424 |
|
|
/* Remember the last physical cluster. */ |
425 |
|
13 |
file_ptr -> fx_file_last_physical_cluster = FAT_index + clusters - 1; |
426 |
|
|
|
427 |
|
|
|
428 |
|
|
/* Check for wrap-around when updating the available size. */ |
429 |
|
|
/* Update the available size. */ |
430 |
|
13 |
file_ptr -> fx_file_current_available_size = |
431 |
|
13 |
file_ptr -> fx_file_current_available_size + (bytes_per_cluster * clusters); |
432 |
|
|
|
433 |
|
|
|
434 |
|
|
/* Increment the total clusters for this file. */ |
435 |
|
13 |
file_ptr -> fx_file_total_clusters = |
436 |
|
13 |
file_ptr -> fx_file_total_clusters + clusters; |
437 |
|
|
|
438 |
|
|
/* Decrease the available clusters on the media. */ |
439 |
|
13 |
media_ptr -> fx_media_available_clusters = |
440 |
|
13 |
media_ptr -> fx_media_available_clusters - clusters; |
441 |
|
|
|
442 |
|
|
#if defined(FX_UPDATE_FILE_SIZE_ON_ALLOCATE) || defined(FX_ENABLE_FAULT_TOLERANT) |
443 |
|
|
|
444 |
|
|
/* Set the file size the current size plus what what was added. */ |
445 |
|
|
file_ptr -> fx_file_current_file_size += size; |
446 |
|
|
|
447 |
|
|
/* Copy the new file size into the directory entry. */ |
448 |
|
|
file_ptr -> fx_file_dir_entry.fx_dir_entry_file_size = file_ptr -> fx_file_current_file_size; |
449 |
|
|
#endif |
450 |
|
|
|
451 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
452 |
|
|
if (media_ptr -> fx_media_fault_tolerant_enabled) |
453 |
|
|
{ |
454 |
|
|
|
455 |
|
|
/* Clear undo phase. */ |
456 |
|
|
media_ptr -> fx_media_fault_tolerant_state &= (UCHAR)(~FX_FAULT_TOLERANT_STATE_SET_FAT_CHAIN & 0xff); |
457 |
|
|
} |
458 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
459 |
|
|
|
460 |
|
|
/* Update the trace event with the new size. */ |
461 |
|
|
FX_TRACE_EVENT_UPDATE(trace_event, trace_timestamp, FX_TRACE_FILE_ALLOCATE, 0, 0, 0, file_ptr -> fx_file_current_file_size); |
462 |
|
|
|
463 |
|
|
/* Write the directory entry to the media. */ |
464 |
|
13 |
status = _fx_directory_entry_write(media_ptr, &(file_ptr -> fx_file_dir_entry)); |
465 |
|
|
|
466 |
|
|
/* Check for a good status. */ |
467 |
✓✓ |
13 |
if (status != FX_SUCCESS) |
468 |
|
|
{ |
469 |
|
|
|
470 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
471 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
472 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
473 |
|
|
|
474 |
|
|
/* Release media protection. */ |
475 |
|
1 |
FX_UNPROTECT |
476 |
|
|
|
477 |
|
|
/* Return the error status. */ |
478 |
|
1 |
return(status); |
479 |
|
|
} |
480 |
|
|
} |
481 |
|
|
else |
482 |
|
|
{ |
483 |
|
|
|
484 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
485 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
486 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
487 |
|
|
|
488 |
|
|
/* Release media protection. */ |
489 |
|
1 |
FX_UNPROTECT |
490 |
|
|
|
491 |
|
|
/* Not enough contiguous space on the media. Return error status. */ |
492 |
|
1 |
return(FX_NO_MORE_SPACE); |
493 |
|
|
} |
494 |
|
|
|
495 |
|
|
#ifdef FX_FAULT_TOLERANT |
496 |
|
|
|
497 |
|
|
/* Flush the cached individual FAT entries */ |
498 |
|
|
_fx_utility_FAT_flush(media_ptr); |
499 |
|
|
#endif |
500 |
|
|
|
501 |
|
|
/* Flush the internal logical sector cache. */ |
502 |
|
12 |
status = _fx_utility_logical_sector_flush(media_ptr, ((ULONG64) 1), (ULONG64)(media_ptr -> fx_media_sectors_per_FAT), FX_FALSE); |
503 |
|
|
|
504 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
505 |
|
|
/* Check for a bad status. */ |
506 |
|
|
if (status != FX_SUCCESS) |
507 |
|
|
{ |
508 |
|
|
|
509 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
510 |
|
|
|
511 |
|
|
/* Release media protection. */ |
512 |
|
|
FX_UNPROTECT |
513 |
|
|
|
514 |
|
|
/* Return the bad status. */ |
515 |
|
|
return(status); |
516 |
|
|
} |
517 |
|
|
|
518 |
|
|
if (media_ptr -> fx_media_fault_tolerant_enabled) |
519 |
|
|
{ |
520 |
|
|
|
521 |
|
|
/* Copy the new file size into the directory entry. */ |
522 |
|
|
file_ptr -> fx_file_dir_entry.fx_dir_entry_file_size = file_ptr -> fx_file_current_file_size; |
523 |
|
|
} |
524 |
|
|
|
525 |
|
|
/* End transaction. */ |
526 |
|
|
status = _fx_fault_tolerant_transaction_end(media_ptr); |
527 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
528 |
|
|
|
529 |
|
|
/* Release media protection. */ |
530 |
|
12 |
FX_UNPROTECT |
531 |
|
|
|
532 |
|
|
/* Return status to the caller. */ |
533 |
|
12 |
return(status); |
534 |
|
|
} |
535 |
|
|
|