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/**************************************************************************/ |
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/* */ |
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/* Copyright (c) Microsoft Corporation. All rights reserved. */ |
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/* */ |
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/* This software is licensed under the Microsoft Software License */ |
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */ |
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ |
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/* and in the root directory of this software. */ |
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/* */ |
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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_directory.h" |
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#include "fx_file.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_file_extended_truncate_release PORTABLE C */ |
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/* 6.1.3 */ |
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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 sets the file to the specified size, if smaller than */ |
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/* the current file size. If the new file size is less than the */ |
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/* current file read/write position, the internal file pointers will */ |
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/* also be modified. Any unused clusters are released back to the */ |
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/* media. */ |
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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 New size of the file in bytes */ |
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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 Write directory entry */ |
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/* _fx_utility_exFAT_bitmap_flush Flush exFAT allocation bitmap */ |
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/* _fx_utility_exFAT_cluster_state_set Set cluster state */ |
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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_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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/* 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), */ |
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/* resulting in version 6.1 */ |
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/* 12-31-2020 William E. Lamie Modified comment(s), fixed */ |
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/* available cluster issue, */ |
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/* resulting in version 6.1.3 */ |
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/* */ |
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/**************************************************************************/ |
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UINT _fx_file_extended_truncate_release(FX_FILE *file_ptr, ULONG64 size) |
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{ |
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UINT status; |
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ULONG cluster; |
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ULONG contents; |
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ULONG bytes_per_cluster; |
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ULONG last_cluster; |
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ULONG cluster_count; |
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ULONG64 bytes_remaining; |
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FX_MEDIA *media_ptr; |
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#ifdef FX_ENABLE_EXFAT |
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ULONG original_last_physical_cluster; |
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#endif /* FX_ENABLE_EXFAT */ |
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#ifndef FX_DONT_UPDATE_OPEN_FILES |
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ULONG open_count; |
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FX_FILE *search_ptr; |
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#endif |
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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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#ifndef FX_MEDIA_STATISTICS_DISABLE |
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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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/* Increment the number of times this service has been called. */ |
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media_ptr -> fx_media_file_truncate_releases++; |
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#endif |
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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_TRUNCATE_RELEASE, file_ptr, size, file_ptr -> fx_file_current_file_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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/* 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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#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 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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/* 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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/* Setup the new file available size - if less than the current available size. */ |
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✓✓ |
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if (size < file_ptr -> fx_file_current_available_size) |
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{ |
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/* Yes, the file needs to be truncated. */ |
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/* Update the available file size. */ |
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file_ptr -> fx_file_current_available_size = ((size + bytes_per_cluster - 1) / bytes_per_cluster) * bytes_per_cluster; |
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/* Is the new available size less than the actual file size? */ |
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✓✓ |
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if (size < file_ptr -> fx_file_current_file_size) |
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{ |
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/* Setup the new file size. */ |
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file_ptr -> fx_file_current_file_size = size; |
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/* Set the modified flag. */ |
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file_ptr -> fx_file_modified = FX_TRUE; |
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/* Copy the new file size into the directory entry. */ |
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file_ptr -> fx_file_dir_entry.fx_dir_entry_file_size = size; |
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/* Set the first cluster to NULL. */ |
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✓✓ |
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if (size == 0) |
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{ |
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/* Yes, the first cluster needs to be cleared since the entire |
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file is going to be truncated. */ |
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file_ptr -> fx_file_dir_entry.fx_dir_entry_cluster = FX_NULL; |
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} |
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/* Write the directory entry to the media. */ |
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#ifdef FX_ENABLE_EXFAT |
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if (media_ptr -> fx_media_FAT_type == FX_exFAT) |
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{ |
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status = _fx_directory_exFAT_entry_write( |
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media_ptr, &(file_ptr -> fx_file_dir_entry), UPDATE_STREAM); |
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} |
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else |
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{ |
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#endif /* FX_ENABLE_EXFAT */ |
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status = _fx_directory_entry_write(media_ptr, &(file_ptr -> fx_file_dir_entry)); |
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#ifdef FX_ENABLE_EXFAT |
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} |
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#endif /* FX_ENABLE_EXFAT */ |
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/* Check for a good 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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/* Error writing the directory. */ |
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return(status); |
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} |
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} |
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/* Update the trace event with the truncated size. */ |
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FX_TRACE_EVENT_UPDATE(trace_event, trace_timestamp, FX_TRACE_FILE_TRUNCATE_RELEASE, 0, 0, 0, file_ptr -> fx_file_current_file_size) |
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} |
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else |
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{ |
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/* Update the trace event with the truncated size. */ |
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FX_TRACE_EVENT_UPDATE(trace_event, trace_timestamp, FX_TRACE_FILE_TRUNCATE_RELEASE, 0, 0, 0, file_ptr -> fx_file_current_file_size) |
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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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/* Just return, the truncate size is larger than the available size. */ |
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return(FX_SUCCESS); |
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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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/* Now check to see if the read/write internal file pointers need |
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to be adjusted. */ |
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✓✓ |
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if (file_ptr -> fx_file_current_file_offset > file_ptr -> fx_file_current_file_size) |
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{ |
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/* At this point, we are ready to walk list of clusters to setup the |
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seek position of this file. */ |
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cluster = file_ptr -> fx_file_first_physical_cluster; |
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bytes_remaining = size; |
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last_cluster = 0; |
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cluster_count = 0; |
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/* Follow the link of FAT entries. */ |
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✓✓✓✓
|
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while ((cluster >= FX_FAT_ENTRY_START) && (cluster < media_ptr -> fx_media_fat_reserved)) |
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{ |
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/* Increment the number of clusters. */ |
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cluster_count++; |
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#ifdef FX_ENABLE_EXFAT |
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if (file_ptr -> fx_file_dir_entry.fx_dir_entry_dont_use_fat & 1) |
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{ |
312 |
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if (cluster >= file_ptr -> fx_file_last_physical_cluster) |
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{ |
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contents = FX_LAST_CLUSTER_exFAT; |
315 |
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} |
316 |
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else |
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{ |
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contents = cluster + 1; |
319 |
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} |
320 |
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} |
321 |
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else |
322 |
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{ |
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#endif /* FX_ENABLE_EXFAT */ |
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/* Read the current cluster entry from the FAT. */ |
326 |
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status = _fx_utility_FAT_entry_read(media_ptr, cluster, &contents); |
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/* Check the return value. */ |
329 |
✓✓ |
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if (status != FX_SUCCESS) |
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{ |
331 |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
334 |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
335 |
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336 |
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/* Release media protection. */ |
337 |
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1 |
FX_UNPROTECT |
338 |
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339 |
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/* Return the error status. */ |
340 |
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1 |
return(status); |
341 |
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} |
342 |
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#ifdef FX_ENABLE_EXFAT |
343 |
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} |
344 |
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#endif /* FX_ENABLE_EXFAT */ |
345 |
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346 |
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/* Save the last valid cluster. */ |
347 |
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last_cluster = cluster; |
348 |
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349 |
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/* Setup for the next cluster. */ |
350 |
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335 |
cluster = contents; |
351 |
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352 |
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/* Determine if this is the last written cluster. */ |
353 |
✓✓ |
335 |
if (bytes_remaining >= bytes_per_cluster) |
354 |
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{ |
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356 |
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/* Still more seeking, just decrement the working byte offset. */ |
357 |
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315 |
bytes_remaining = bytes_remaining - bytes_per_cluster; |
358 |
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} |
359 |
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else |
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{ |
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362 |
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/* This is the cluster that contains the seek position. */ |
363 |
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break; |
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} |
365 |
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} |
366 |
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367 |
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/* Check for errors in traversal of the FAT chain. */ |
368 |
✓✓ |
22 |
if (size > (((ULONG64) bytes_per_cluster) * ((ULONG64) cluster_count))) |
369 |
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{ |
370 |
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371 |
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#ifdef FX_ENABLE_FAULT_TOLERANT |
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FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
373 |
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#endif /* FX_ENABLE_FAULT_TOLERANT */ |
374 |
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375 |
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/* Release media protection. */ |
376 |
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2 |
FX_UNPROTECT |
377 |
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378 |
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/* This is an error that suggests a corrupt file. */ |
379 |
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2 |
return(FX_FILE_CORRUPT); |
380 |
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} |
381 |
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382 |
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/* Position the pointers to the new offset. */ |
383 |
|
20 |
file_ptr -> fx_file_current_physical_cluster = last_cluster; |
384 |
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20 |
file_ptr -> fx_file_current_relative_cluster = cluster_count - 1; |
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file_ptr -> fx_file_current_logical_sector = ((ULONG)media_ptr -> fx_media_data_sector_start) + |
386 |
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20 |
(((ULONG64)file_ptr -> fx_file_current_physical_cluster - FX_FAT_ENTRY_START) * |
387 |
|
20 |
((ULONG)media_ptr -> fx_media_sectors_per_cluster)) + |
388 |
|
20 |
(bytes_remaining / (ULONG)media_ptr -> fx_media_bytes_per_sector); |
389 |
|
20 |
file_ptr -> fx_file_current_relative_sector = (UINT)((bytes_remaining / (ULONG)media_ptr -> fx_media_bytes_per_sector)); |
390 |
|
20 |
file_ptr -> fx_file_current_file_offset = size; |
391 |
|
20 |
file_ptr -> fx_file_current_logical_offset = (ULONG)bytes_remaining % ((ULONG)media_ptr -> fx_media_bytes_per_sector); |
392 |
|
|
} |
393 |
|
|
|
394 |
|
|
/* Determine how many clusters are actually in-use now. */ |
395 |
|
22 |
cluster_count = (ULONG) (file_ptr -> fx_file_current_available_size + (((ULONG64) bytes_per_cluster) - ((ULONG64) 1)))/bytes_per_cluster; |
396 |
|
|
|
397 |
|
|
/* Save the number of clusters in-use. */ |
398 |
|
22 |
file_ptr -> fx_file_total_clusters = cluster_count; |
399 |
|
|
|
400 |
|
|
/* At this point, we are ready to walk list of clusters to find the clusters |
401 |
|
|
that can be released. */ |
402 |
|
22 |
cluster = file_ptr -> fx_file_first_physical_cluster; |
403 |
|
|
#ifdef FX_ENABLE_EXFAT |
404 |
|
|
original_last_physical_cluster = file_ptr -> fx_file_last_physical_cluster; |
405 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
406 |
|
|
|
407 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
408 |
|
|
/* Is this the last used cluster? */ |
409 |
|
|
if ((cluster_count == 0) && (media_ptr -> fx_media_fault_tolerant_enabled)) |
410 |
|
|
{ |
411 |
|
|
#ifdef FX_ENABLE_EXFAT |
412 |
|
|
if (!(file_ptr -> fx_file_dir_entry.fx_dir_entry_dont_use_fat & 1)) |
413 |
|
|
{ |
414 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
415 |
|
|
|
416 |
|
|
/* Set undo log. */ |
417 |
|
|
status = _fx_fault_tolerant_set_FAT_chain(media_ptr, FX_FALSE, FX_FREE_CLUSTER, |
418 |
|
|
media_ptr -> fx_media_fat_last, cluster, media_ptr -> fx_media_fat_last); |
419 |
|
|
|
420 |
|
|
/* Determine if the write was successful. */ |
421 |
|
|
if (status != FX_SUCCESS) |
422 |
|
|
{ |
423 |
|
|
|
424 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
425 |
|
|
|
426 |
|
|
/* Release media protection. */ |
427 |
|
|
FX_UNPROTECT |
428 |
|
|
|
429 |
|
|
/* Return the error code. */ |
430 |
|
|
return(status); |
431 |
|
|
} |
432 |
|
|
#ifdef FX_ENABLE_EXFAT |
433 |
|
|
} |
434 |
|
|
else |
435 |
|
|
{ |
436 |
|
|
|
437 |
|
|
/* Set undo log. */ |
438 |
|
|
status = _fx_fault_tolerant_set_FAT_chain(media_ptr, FX_TRUE, FX_FREE_CLUSTER, |
439 |
|
|
media_ptr -> fx_media_fat_last, cluster, file_ptr -> fx_file_last_physical_cluster + 1); |
440 |
|
|
|
441 |
|
|
/* Determine if the write was successful. */ |
442 |
|
|
if (status != FX_SUCCESS) |
443 |
|
|
{ |
444 |
|
|
|
445 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
446 |
|
|
|
447 |
|
|
/* Release media protection. */ |
448 |
|
|
FX_UNPROTECT |
449 |
|
|
|
450 |
|
|
/* Return the error code. */ |
451 |
|
|
return(status); |
452 |
|
|
} |
453 |
|
|
} |
454 |
|
|
#endif /* FX_ENABLE_EXFAT && FX_ENABLE_FAULT_TOLERANT */ |
455 |
|
|
|
456 |
|
|
file_ptr -> fx_file_last_physical_cluster = cluster; |
457 |
|
|
} |
458 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
459 |
|
|
|
460 |
|
|
/* Follow the link of FAT entries. */ |
461 |
✓✓✓✓
|
14647 |
while ((cluster >= FX_FAT_ENTRY_START) && (cluster < media_ptr -> fx_media_fat_reserved)) |
462 |
|
|
{ |
463 |
|
|
#ifdef FX_ENABLE_EXFAT |
464 |
|
|
if (file_ptr -> fx_file_dir_entry.fx_dir_entry_dont_use_fat & 1) |
465 |
|
|
{ |
466 |
|
|
if (cluster >= original_last_physical_cluster) |
467 |
|
|
{ |
468 |
|
|
contents = FX_LAST_CLUSTER_exFAT; |
469 |
|
|
} |
470 |
|
|
else |
471 |
|
|
{ |
472 |
|
|
contents = cluster + 1; |
473 |
|
|
} |
474 |
|
|
} |
475 |
|
|
else |
476 |
|
|
{ |
477 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
478 |
|
|
|
479 |
|
|
/* Read the current cluster entry from the FAT. */ |
480 |
|
14628 |
status = _fx_utility_FAT_entry_read(media_ptr, cluster, &contents); |
481 |
|
|
|
482 |
|
|
/* Check the return value. */ |
483 |
✓✓ |
14628 |
if (status != FX_SUCCESS) |
484 |
|
|
{ |
485 |
|
|
|
486 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
487 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
488 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
489 |
|
|
|
490 |
|
|
/* Release media protection. */ |
491 |
|
1 |
FX_UNPROTECT |
492 |
|
|
|
493 |
|
|
/* Return the error status. */ |
494 |
|
1 |
return(status); |
495 |
|
|
} |
496 |
|
|
#ifdef FX_ENABLE_EXFAT |
497 |
|
|
} |
498 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
499 |
|
|
|
500 |
|
|
/* Determine if are more clusters to release. */ |
501 |
✓✓ |
14627 |
if (cluster_count > 0) |
502 |
|
|
{ |
503 |
|
|
|
504 |
|
|
/* Decrement the number of clusters. */ |
505 |
|
322 |
cluster_count--; |
506 |
|
|
|
507 |
|
|
/* Is this the last used cluster? */ |
508 |
✓✓ |
322 |
if (cluster_count == 0) |
509 |
|
|
{ |
510 |
|
|
#ifdef FX_ENABLE_EXFAT |
511 |
|
|
if (!(file_ptr -> fx_file_dir_entry.fx_dir_entry_dont_use_fat & 1)) |
512 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
513 |
|
|
{ |
514 |
|
|
|
515 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
516 |
|
|
if (media_ptr -> fx_media_fault_tolerant_enabled) |
517 |
|
|
{ |
518 |
|
|
|
519 |
|
|
/* Set undo phase. */ |
520 |
|
|
media_ptr -> fx_media_fault_tolerant_state |= FX_FAULT_TOLERANT_STATE_SET_FAT_CHAIN; |
521 |
|
|
|
522 |
|
|
/* Read the current cluster entry from the FAT. */ |
523 |
|
|
status = _fx_utility_FAT_entry_read(media_ptr, cluster, &contents); |
524 |
|
|
|
525 |
|
|
/* Check the return value. */ |
526 |
|
|
if (status != FX_SUCCESS) |
527 |
|
|
{ |
528 |
|
|
|
529 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
530 |
|
|
|
531 |
|
|
/* Release media protection. */ |
532 |
|
|
FX_UNPROTECT |
533 |
|
|
|
534 |
|
|
/* Return the error status. */ |
535 |
|
|
return(status); |
536 |
|
|
} |
537 |
|
|
|
538 |
|
|
/* Set undo log. */ |
539 |
|
|
status = _fx_fault_tolerant_set_FAT_chain(media_ptr, FX_FALSE, cluster, |
540 |
|
|
media_ptr -> fx_media_fat_last, contents, media_ptr -> fx_media_fat_last); |
541 |
|
|
|
542 |
|
|
/* Determine if the write was successful. */ |
543 |
|
|
if (status != FX_SUCCESS) |
544 |
|
|
{ |
545 |
|
|
|
546 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
547 |
|
|
|
548 |
|
|
/* Release media protection. */ |
549 |
|
|
FX_UNPROTECT |
550 |
|
|
|
551 |
|
|
/* Return the error code. */ |
552 |
|
|
return(status); |
553 |
|
|
} |
554 |
|
|
} |
555 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
556 |
|
|
|
557 |
|
|
/* Yes, it should be designated as last cluster. */ |
558 |
|
10 |
status = _fx_utility_FAT_entry_write(media_ptr, cluster, media_ptr -> fx_media_fat_last); |
559 |
|
|
|
560 |
|
|
/* Check the return value. */ |
561 |
✓✓ |
10 |
if (status) |
562 |
|
|
{ |
563 |
|
|
|
564 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
565 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
566 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
567 |
|
|
|
568 |
|
|
/* Release media protection. */ |
569 |
|
1 |
FX_UNPROTECT |
570 |
|
|
|
571 |
|
|
/* Return the error status. */ |
572 |
|
1 |
return(status); |
573 |
|
|
} |
574 |
|
|
|
575 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
576 |
|
|
if (media_ptr -> fx_media_fault_tolerant_enabled) |
577 |
|
|
{ |
578 |
|
|
|
579 |
|
|
/* Clear undo phase. */ |
580 |
|
|
media_ptr -> fx_media_fault_tolerant_state &= (UCHAR)(~FX_FAULT_TOLERANT_STATE_SET_FAT_CHAIN & 0xff); |
581 |
|
|
} |
582 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
583 |
|
|
} |
584 |
|
|
#if defined(FX_ENABLE_EXFAT) && defined(FX_ENABLE_FAULT_TOLERANT) |
585 |
|
|
else if (media_ptr -> fx_media_fault_tolerant_enabled) |
586 |
|
|
{ |
587 |
|
|
|
588 |
|
|
/* Set undo log. */ |
589 |
|
|
status = _fx_fault_tolerant_set_FAT_chain(media_ptr, FX_TRUE, cluster, |
590 |
|
|
media_ptr -> fx_media_fat_last, contents, file_ptr -> fx_file_last_physical_cluster + 1); |
591 |
|
|
|
592 |
|
|
/* Determine if the write was successful. */ |
593 |
|
|
if (status != FX_SUCCESS) |
594 |
|
|
{ |
595 |
|
|
|
596 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
597 |
|
|
|
598 |
|
|
/* Release media protection. */ |
599 |
|
|
FX_UNPROTECT |
600 |
|
|
|
601 |
|
|
/* Return the error code. */ |
602 |
|
|
return(status); |
603 |
|
|
} |
604 |
|
|
} |
605 |
|
|
#endif /* FX_ENABLE_EXFAT && FX_ENABLE_FAULT_TOLERANT */ |
606 |
|
|
|
607 |
|
9 |
file_ptr -> fx_file_last_physical_cluster = cluster; |
608 |
|
|
|
609 |
|
|
#ifdef FX_FAULT_TOLERANT |
610 |
|
|
|
611 |
|
|
/* Flush the cached individual FAT entries. */ |
612 |
|
|
status = _fx_utility_FAT_flush(media_ptr); |
613 |
|
|
|
614 |
|
|
/* Check the return value. */ |
615 |
|
|
if (status) |
616 |
|
|
{ |
617 |
|
|
|
618 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
619 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
620 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
621 |
|
|
|
622 |
|
|
/* Release media protection. */ |
623 |
|
|
FX_UNPROTECT |
624 |
|
|
|
625 |
|
|
/* Return the error status. */ |
626 |
|
|
return(status); |
627 |
|
|
} |
628 |
|
|
#endif |
629 |
|
|
} |
630 |
|
|
} |
631 |
|
|
else |
632 |
|
|
{ |
633 |
|
|
|
634 |
|
|
/* This is a cluster after the clusters used by the file, release |
635 |
|
|
it back to the media. */ |
636 |
|
|
|
637 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
638 |
|
|
if (media_ptr -> fx_media_fault_tolerant_enabled == FX_FALSE) |
639 |
|
|
{ |
640 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
641 |
|
|
|
642 |
|
|
#ifdef FX_ENABLE_EXFAT |
643 |
|
|
if (!(file_ptr -> fx_file_dir_entry.fx_dir_entry_dont_use_fat & 1)) |
644 |
|
|
{ |
645 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
646 |
|
14305 |
status = _fx_utility_FAT_entry_write(media_ptr, cluster, FX_FREE_CLUSTER); |
647 |
|
|
|
648 |
|
|
/* Check the return value. */ |
649 |
✓✓ |
14305 |
if (status) |
650 |
|
|
{ |
651 |
|
|
|
652 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
653 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
654 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
655 |
|
|
|
656 |
|
|
/* Release media protection. */ |
657 |
|
1 |
FX_UNPROTECT |
658 |
|
|
|
659 |
|
|
/* Return the error status. */ |
660 |
|
1 |
return(status); |
661 |
|
|
} |
662 |
|
|
#ifdef FX_ENABLE_EXFAT |
663 |
|
|
} |
664 |
|
|
|
665 |
|
|
if (media_ptr -> fx_media_FAT_type == FX_exFAT) |
666 |
|
|
{ |
667 |
|
|
|
668 |
|
|
/* Mark the cluster as free. */ |
669 |
|
|
_fx_utility_exFAT_cluster_state_set(media_ptr, cluster, FX_EXFAT_BITMAP_CLUSTER_FREE); |
670 |
|
|
} |
671 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
672 |
|
|
|
673 |
|
|
/* Increment the number of available clusters. */ |
674 |
|
14304 |
media_ptr -> fx_media_available_clusters++; |
675 |
|
|
|
676 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
677 |
|
|
} |
678 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
679 |
|
|
} |
680 |
|
|
|
681 |
|
|
/* Setup for the next cluster. */ |
682 |
|
14625 |
cluster = contents; |
683 |
|
|
} |
684 |
|
|
|
685 |
|
|
/* Determine if we need to adjust the number of leading consecutive clusters. */ |
686 |
✓✓ |
19 |
if (file_ptr -> fx_file_consecutive_cluster > file_ptr -> fx_file_total_clusters) |
687 |
|
|
{ |
688 |
|
|
|
689 |
|
|
/* Adjust the leading consecutive cluster count. */ |
690 |
|
10 |
file_ptr -> fx_file_consecutive_cluster = file_ptr -> fx_file_total_clusters; |
691 |
|
|
} |
692 |
|
|
|
693 |
|
|
/* Determine if the file available size has been truncated to zero. */ |
694 |
✓✓ |
19 |
if (file_ptr -> fx_file_current_available_size == 0) |
695 |
|
|
{ |
696 |
|
|
|
697 |
|
|
/* Yes, the first cluster has already been released. Update the file info |
698 |
|
|
to indicate the file has no clusters. */ |
699 |
|
10 |
file_ptr -> fx_file_last_physical_cluster = 0; |
700 |
|
10 |
file_ptr -> fx_file_first_physical_cluster = 0; |
701 |
|
10 |
file_ptr -> fx_file_current_physical_cluster = 0; |
702 |
|
10 |
file_ptr -> fx_file_current_logical_sector = 0; |
703 |
|
10 |
file_ptr -> fx_file_current_relative_cluster = 0; |
704 |
|
10 |
file_ptr -> fx_file_current_relative_sector = 0; |
705 |
|
10 |
file_ptr -> fx_file_current_available_size = 0; |
706 |
|
10 |
file_ptr -> fx_file_consecutive_cluster = 1; |
707 |
|
|
} |
708 |
|
|
|
709 |
|
|
#ifndef FX_DONT_UPDATE_OPEN_FILES |
710 |
|
|
|
711 |
|
|
/* Search the opened files list to see if the same file is opened for reading. */ |
712 |
|
19 |
open_count = media_ptr -> fx_media_opened_file_count; |
713 |
|
19 |
search_ptr = media_ptr -> fx_media_opened_file_list; |
714 |
✓✓ |
54 |
while (open_count) |
715 |
|
|
{ |
716 |
|
|
|
717 |
|
|
/* Is this file the same file opened for reading? */ |
718 |
✓✓ |
38 |
if ((search_ptr != file_ptr) && |
719 |
|
19 |
(search_ptr -> fx_file_dir_entry.fx_dir_entry_log_sector == |
720 |
✓✓ |
19 |
file_ptr -> fx_file_dir_entry.fx_dir_entry_log_sector) && |
721 |
|
15 |
(search_ptr -> fx_file_dir_entry.fx_dir_entry_byte_offset == |
722 |
✓✓ |
15 |
file_ptr -> fx_file_dir_entry.fx_dir_entry_byte_offset)) |
723 |
|
|
{ |
724 |
|
|
|
725 |
|
|
/* Yes, the same file is opened for reading. */ |
726 |
|
|
|
727 |
|
|
/* Setup the new file size. */ |
728 |
|
9 |
search_ptr -> fx_file_current_file_size = size; |
729 |
|
|
|
730 |
|
|
/* Setup the new total clusters. */ |
731 |
|
9 |
search_ptr -> fx_file_total_clusters = file_ptr -> fx_file_total_clusters; |
732 |
|
|
|
733 |
|
|
/* Copy the directory entry. */ |
734 |
|
9 |
search_ptr -> fx_file_dir_entry.fx_dir_entry_cluster = file_ptr -> fx_file_dir_entry.fx_dir_entry_cluster; |
735 |
|
9 |
search_ptr -> fx_file_dir_entry.fx_dir_entry_file_size = file_ptr -> fx_file_dir_entry.fx_dir_entry_file_size; |
736 |
|
9 |
search_ptr -> fx_file_dir_entry.fx_dir_entry_log_sector = file_ptr -> fx_file_dir_entry.fx_dir_entry_log_sector; |
737 |
|
9 |
search_ptr -> fx_file_dir_entry.fx_dir_entry_byte_offset = file_ptr -> fx_file_dir_entry.fx_dir_entry_byte_offset; |
738 |
|
|
|
739 |
|
|
/* Setup the other file parameters. */ |
740 |
|
9 |
search_ptr -> fx_file_last_physical_cluster = file_ptr -> fx_file_last_physical_cluster; |
741 |
|
9 |
search_ptr -> fx_file_first_physical_cluster = file_ptr -> fx_file_first_physical_cluster; |
742 |
|
9 |
search_ptr -> fx_file_current_available_size = file_ptr -> fx_file_current_available_size; |
743 |
|
9 |
search_ptr -> fx_file_consecutive_cluster = file_ptr -> fx_file_consecutive_cluster; |
744 |
|
|
|
745 |
|
|
/* Determine if the truncated file is smaller than the current file offset. */ |
746 |
✓✓ |
9 |
if (search_ptr -> fx_file_current_file_offset > size) |
747 |
|
|
{ |
748 |
|
|
|
749 |
|
|
/* Yes, the current file parameters need to be changed since the file was |
750 |
|
|
truncated to a position prior to the current file position. */ |
751 |
|
|
|
752 |
|
|
/* Calculate the number of bytes per cluster. */ |
753 |
|
7 |
bytes_per_cluster = ((ULONG)media_ptr -> fx_media_bytes_per_sector) * |
754 |
|
7 |
((ULONG)media_ptr -> fx_media_sectors_per_cluster); |
755 |
|
|
|
756 |
|
|
/* At this point, we are ready to walk list of clusters to setup the |
757 |
|
|
seek position of this file. */ |
758 |
|
7 |
cluster = search_ptr -> fx_file_first_physical_cluster; |
759 |
|
7 |
bytes_remaining = size; |
760 |
|
7 |
last_cluster = 0; |
761 |
|
7 |
cluster_count = 0; |
762 |
|
|
|
763 |
|
|
/* Follow the link of FAT entries. */ |
764 |
✓✓✓✓
|
38 |
while ((cluster >= FX_FAT_ENTRY_START) && (cluster < media_ptr -> fx_media_fat_reserved)) |
765 |
|
|
{ |
766 |
|
|
|
767 |
|
|
/* Increment the number of clusters. */ |
768 |
|
35 |
cluster_count++; |
769 |
|
|
|
770 |
|
|
#ifdef FX_ENABLE_EXFAT |
771 |
|
|
if (file_ptr -> fx_file_dir_entry.fx_dir_entry_dont_use_fat & 1) |
772 |
|
|
{ |
773 |
|
|
if (cluster >= file_ptr -> fx_file_last_physical_cluster) |
774 |
|
|
{ |
775 |
|
|
contents = FX_LAST_CLUSTER_exFAT; |
776 |
|
|
} |
777 |
|
|
else |
778 |
|
|
{ |
779 |
|
|
contents = cluster + 1; |
780 |
|
|
} |
781 |
|
|
} |
782 |
|
|
else |
783 |
|
|
{ |
784 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
785 |
|
|
|
786 |
|
|
/* Read the current cluster entry from the FAT. */ |
787 |
|
35 |
status = _fx_utility_FAT_entry_read(media_ptr, cluster, &contents); |
788 |
|
|
|
789 |
|
|
/* Check the return value. */ |
790 |
✓✓ |
35 |
if (status != FX_SUCCESS) |
791 |
|
|
{ |
792 |
|
|
|
793 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
794 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
795 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
796 |
|
|
|
797 |
|
|
/* Release media protection. */ |
798 |
|
1 |
FX_UNPROTECT |
799 |
|
|
|
800 |
|
|
/* Return the error status. */ |
801 |
|
1 |
return(status); |
802 |
|
|
} |
803 |
|
|
#ifdef FX_ENABLE_EXFAT |
804 |
|
|
} |
805 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
806 |
|
|
|
807 |
|
|
/* Save the last valid cluster. */ |
808 |
|
34 |
last_cluster = cluster; |
809 |
|
|
|
810 |
|
|
/* Setup for the next cluster. */ |
811 |
|
34 |
cluster = contents; |
812 |
|
|
|
813 |
|
|
/* Determine if this is the last written cluster. */ |
814 |
✓✓ |
34 |
if (bytes_remaining >= bytes_per_cluster) |
815 |
|
|
{ |
816 |
|
|
|
817 |
|
|
/* Still more seeking, just decrement the working byte offset. */ |
818 |
|
31 |
bytes_remaining = bytes_remaining - bytes_per_cluster; |
819 |
|
|
} |
820 |
|
|
else |
821 |
|
|
{ |
822 |
|
|
|
823 |
|
|
/* This is the cluster that contains the seek position. */ |
824 |
|
3 |
break; |
825 |
|
|
} |
826 |
|
|
} |
827 |
|
|
|
828 |
|
|
/* Check for errors in traversal of the FAT chain. */ |
829 |
✓✓ |
6 |
if (size > (((ULONG64) bytes_per_cluster) * ((ULONG64) cluster_count))) |
830 |
|
|
{ |
831 |
|
|
|
832 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
833 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
834 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
835 |
|
|
|
836 |
|
|
/* Release media protection. */ |
837 |
|
2 |
FX_UNPROTECT |
838 |
|
|
|
839 |
|
|
/* This is an error that suggests a corrupt file. */ |
840 |
|
2 |
return(FX_FILE_CORRUPT); |
841 |
|
|
} |
842 |
|
|
|
843 |
|
|
/* Position the pointers to the new offset. */ |
844 |
|
|
|
845 |
|
|
/* Determine if there is at least one cluster. */ |
846 |
✓✓ |
4 |
if (cluster_count) |
847 |
|
|
{ |
848 |
|
|
|
849 |
|
|
/* Calculate real file parameters. */ |
850 |
|
3 |
search_ptr -> fx_file_current_physical_cluster = last_cluster; |
851 |
|
3 |
search_ptr -> fx_file_current_relative_cluster = cluster_count - 1; |
852 |
|
3 |
search_ptr -> fx_file_current_logical_sector = ((ULONG)media_ptr -> fx_media_data_sector_start) + |
853 |
|
3 |
(((ULONG64)search_ptr -> fx_file_current_physical_cluster - FX_FAT_ENTRY_START) * |
854 |
|
3 |
((ULONG)media_ptr -> fx_media_sectors_per_cluster)) + |
855 |
|
3 |
(bytes_remaining / (ULONG)media_ptr -> fx_media_bytes_per_sector); |
856 |
|
3 |
search_ptr -> fx_file_current_relative_sector = (UINT)((bytes_remaining / (ULONG)media_ptr -> fx_media_bytes_per_sector)); |
857 |
|
3 |
search_ptr -> fx_file_current_file_offset = size; |
858 |
|
3 |
search_ptr -> fx_file_current_logical_offset = (ULONG)bytes_remaining % ((ULONG)media_ptr -> fx_media_bytes_per_sector); |
859 |
|
|
} |
860 |
|
|
else |
861 |
|
|
{ |
862 |
|
|
|
863 |
|
|
/* Calculate zero-length file parameters. */ |
864 |
|
1 |
search_ptr -> fx_file_current_physical_cluster = 0; |
865 |
|
1 |
search_ptr -> fx_file_current_relative_cluster = 0; |
866 |
|
1 |
search_ptr -> fx_file_current_logical_sector = 0; |
867 |
|
1 |
search_ptr -> fx_file_current_relative_sector = 0; |
868 |
|
1 |
search_ptr -> fx_file_current_file_offset = 0; |
869 |
|
1 |
search_ptr -> fx_file_current_logical_offset = 0; |
870 |
|
|
} |
871 |
|
|
} |
872 |
|
|
} |
873 |
|
|
|
874 |
|
|
/* Adjust the pointer and decrement the search count. */ |
875 |
|
35 |
search_ptr = search_ptr -> fx_file_opened_next; |
876 |
|
35 |
open_count--; |
877 |
|
|
} |
878 |
|
|
#endif |
879 |
|
|
|
880 |
|
|
#ifdef FX_FAULT_TOLERANT |
881 |
|
|
|
882 |
|
|
/* Flush the cached individual FAT entries */ |
883 |
|
|
status = _fx_utility_FAT_flush(media_ptr); |
884 |
|
|
|
885 |
|
|
/* Check the return value. */ |
886 |
|
|
if (status) |
887 |
|
|
{ |
888 |
|
|
|
889 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
890 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
891 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
892 |
|
|
|
893 |
|
|
/* Release media protection. */ |
894 |
|
|
FX_UNPROTECT |
895 |
|
|
|
896 |
|
|
/* Return the error status. */ |
897 |
|
|
return(status); |
898 |
|
|
} |
899 |
|
|
#ifdef FX_ENABLE_EXFAT |
900 |
|
|
/* Flush Bit Map. */ |
901 |
|
|
if (media_ptr -> fx_media_FAT_type == FX_exFAT) |
902 |
|
|
{ |
903 |
|
|
_fx_utility_exFAT_bitmap_flush(media_ptr); |
904 |
|
|
} |
905 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
906 |
|
|
|
907 |
|
|
#endif |
908 |
|
|
|
909 |
|
|
#ifdef FX_ENABLE_FAULT_TOLERANT |
910 |
|
|
if (media_ptr -> fx_media_fault_tolerant_enabled && |
911 |
|
|
(media_ptr -> fx_media_fault_tolerant_state & FX_FAULT_TOLERANT_STATE_STARTED)) |
912 |
|
|
{ |
913 |
|
|
|
914 |
|
|
/* Copy the new file size into the directory entry. */ |
915 |
|
|
file_ptr -> fx_file_dir_entry.fx_dir_entry_file_size = file_ptr -> fx_file_current_file_size; |
916 |
|
|
} |
917 |
|
|
|
918 |
|
|
/* Write the directory entry to the media. */ |
919 |
|
|
#ifdef FX_ENABLE_EXFAT |
920 |
|
|
if (media_ptr -> fx_media_FAT_type == FX_exFAT) |
921 |
|
|
{ |
922 |
|
|
|
923 |
|
|
status = _fx_directory_exFAT_entry_write(media_ptr, &(file_ptr -> fx_file_dir_entry), UPDATE_STREAM); |
924 |
|
|
} |
925 |
|
|
else |
926 |
|
|
{ |
927 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
928 |
|
|
status = _fx_directory_entry_write(media_ptr, &(file_ptr -> fx_file_dir_entry)); |
929 |
|
|
#ifdef FX_ENABLE_EXFAT |
930 |
|
|
} |
931 |
|
|
#endif /* FX_ENABLE_EXFAT */ |
932 |
|
|
|
933 |
|
|
/* Check for a good status. */ |
934 |
|
|
if (status != FX_SUCCESS) |
935 |
|
|
{ |
936 |
|
|
|
937 |
|
|
FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); |
938 |
|
|
|
939 |
|
|
/* Release media protection. */ |
940 |
|
|
FX_UNPROTECT |
941 |
|
|
|
942 |
|
|
/* Error writing the directory. */ |
943 |
|
|
return(status); |
944 |
|
|
} |
945 |
|
|
|
946 |
|
|
/* End transaction. */ |
947 |
|
|
status = _fx_fault_tolerant_transaction_end(media_ptr); |
948 |
|
|
|
949 |
|
|
/* Check for a bad status. */ |
950 |
|
|
if (status != FX_SUCCESS) |
951 |
|
|
{ |
952 |
|
|
|
953 |
|
|
/* Release media protection. */ |
954 |
|
|
FX_UNPROTECT |
955 |
|
|
|
956 |
|
|
/* Return the bad status. */ |
957 |
|
|
return(status); |
958 |
|
|
} |
959 |
|
|
|
960 |
|
|
/* Update maximum size used if necessary. */ |
961 |
|
|
if (size < file_ptr -> fx_file_maximum_size_used) |
962 |
|
|
{ |
963 |
|
|
file_ptr -> fx_file_maximum_size_used = size; |
964 |
|
|
} |
965 |
|
|
#endif /* FX_ENABLE_FAULT_TOLERANT */ |
966 |
|
|
|
967 |
|
|
/* Release media protection. */ |
968 |
|
16 |
FX_UNPROTECT |
969 |
|
|
|
970 |
|
|
/* Truncate is complete, return successful status. */ |
971 |
|
16 |
return(FX_SUCCESS); |
972 |
|
|
} |
973 |
|
|
|