fx_file_extended_truncate_release.c
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /*************************************************************************** | ||
| 2 | * Copyright (c) 2024 Microsoft Corporation | ||
| 3 | * Copyright (c) 2026-present Eclipse ThreadX contributors | ||
| 4 | * | ||
| 5 | * This program and the accompanying materials are made available under the | ||
| 6 | * terms of the MIT License which is available at | ||
| 7 | * https://opensource.org/licenses/MIT. | ||
| 8 | * | ||
| 9 | * SPDX-License-Identifier: MIT | ||
| 10 | **************************************************************************/ | ||
| 11 | |||
| 12 | |||
| 13 | /**************************************************************************/ | ||
| 14 | /**************************************************************************/ | ||
| 15 | /** */ | ||
| 16 | /** FileX Component */ | ||
| 17 | /** */ | ||
| 18 | /** File */ | ||
| 19 | /** */ | ||
| 20 | /**************************************************************************/ | ||
| 21 | /**************************************************************************/ | ||
| 22 | |||
| 23 | #define FX_SOURCE_CODE | ||
| 24 | |||
| 25 | |||
| 26 | /* Include necessary system files. */ | ||
| 27 | |||
| 28 | #include "fx_api.h" | ||
| 29 | #include "fx_system.h" | ||
| 30 | #include "fx_directory.h" | ||
| 31 | #include "fx_file.h" | ||
| 32 | #include "fx_utility.h" | ||
| 33 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 34 | #include "fx_fault_tolerant.h" | ||
| 35 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 36 | |||
| 37 | |||
| 38 | /**************************************************************************/ | ||
| 39 | /* */ | ||
| 40 | /* FUNCTION RELEASE */ | ||
| 41 | /* */ | ||
| 42 | /* _fx_file_extended_truncate_release PORTABLE C */ | ||
| 43 | /* 6.1.3 */ | ||
| 44 | /* AUTHOR */ | ||
| 45 | /* */ | ||
| 46 | /* William E. Lamie, Microsoft Corporation */ | ||
| 47 | /* */ | ||
| 48 | /* DESCRIPTION */ | ||
| 49 | /* */ | ||
| 50 | /* This function sets the file to the specified size, if smaller than */ | ||
| 51 | /* the current file size. If the new file size is less than the */ | ||
| 52 | /* current file read/write position, the internal file pointers will */ | ||
| 53 | /* also be modified. Any unused clusters are released back to the */ | ||
| 54 | /* media. */ | ||
| 55 | /* */ | ||
| 56 | /* INPUT */ | ||
| 57 | /* */ | ||
| 58 | /* file_ptr File control block pointer */ | ||
| 59 | /* size New size of the file in bytes */ | ||
| 60 | /* */ | ||
| 61 | /* OUTPUT */ | ||
| 62 | /* */ | ||
| 63 | /* return status */ | ||
| 64 | /* */ | ||
| 65 | /* CALLS */ | ||
| 66 | /* */ | ||
| 67 | /* _fx_directory_entry_write Write directory entry */ | ||
| 68 | /* _fx_utility_FAT_entry_read Read a FAT entry */ | ||
| 69 | /* _fx_utility_FAT_entry_write Write a FAT entry */ | ||
| 70 | /* _fx_utility_FAT_flush Flush written FAT entries */ | ||
| 71 | /* _fx_fault_tolerant_transaction_start Start fault tolerant */ | ||
| 72 | /* transaction */ | ||
| 73 | /* _fx_fault_tolerant_transaction_end End fault tolerant transaction*/ | ||
| 74 | /* _fx_fault_tolerant_recover Recover FAT chain */ | ||
| 75 | /* _fx_fault_tolerant_reset_log_file Reset the log file */ | ||
| 76 | /* _fx_fault_tolerant_set_FAT_chain Set data of FAT chain */ | ||
| 77 | /* */ | ||
| 78 | /* CALLED BY */ | ||
| 79 | /* */ | ||
| 80 | /* Application Code */ | ||
| 81 | /* */ | ||
| 82 | /**************************************************************************/ | ||
| 83 | 3400910 | UINT _fx_file_extended_truncate_release(FX_FILE *file_ptr, ULONG64 size) | |
| 84 | { | ||
| 85 | |||
| 86 | UINT status; | ||
| 87 | ULONG cluster; | ||
| 88 | ULONG contents; | ||
| 89 | ULONG bytes_per_cluster; | ||
| 90 | ULONG last_cluster; | ||
| 91 | ULONG cluster_count; | ||
| 92 | ULONG64 bytes_remaining; | ||
| 93 | FX_MEDIA *media_ptr; | ||
| 94 | |||
| 95 | |||
| 96 | #ifndef FX_DONT_UPDATE_OPEN_FILES | ||
| 97 | ULONG open_count; | ||
| 98 | FX_FILE *search_ptr; | ||
| 99 | #endif | ||
| 100 | |||
| 101 | #ifdef TX_ENABLE_EVENT_TRACE | ||
| 102 | TX_TRACE_BUFFER_ENTRY *trace_event; | ||
| 103 | ULONG trace_timestamp; | ||
| 104 | #endif | ||
| 105 | |||
| 106 | |||
| 107 | /* First, determine if the file is still open. */ | ||
| 108 |
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3400910 | if (file_ptr -> fx_file_id != FX_FILE_ID) |
| 109 | { | ||
| 110 | |||
| 111 | /* Return the file not open error status. */ | ||
| 112 | 9 | return(FX_NOT_OPEN); | |
| 113 | } | ||
| 114 | |||
| 115 | #ifndef FX_MEDIA_STATISTICS_DISABLE | ||
| 116 | /* Setup pointer to media structure. */ | ||
| 117 | 3400901 | media_ptr = file_ptr -> fx_file_media_ptr; | |
| 118 | |||
| 119 | /* Increment the number of times this service has been called. */ | ||
| 120 | 3400901 | media_ptr -> fx_media_file_truncate_releases++; | |
| 121 | #endif | ||
| 122 | |||
| 123 | /* Setup pointer to associated media control block. */ | ||
| 124 | 3400901 | media_ptr = file_ptr -> fx_file_media_ptr; | |
| 125 | |||
| 126 | /* If trace is enabled, insert this event into the trace buffer. */ | ||
| 127 | 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) | ||
| 128 | |||
| 129 | /* Protect against other threads accessing the media. */ | ||
| 130 | 3400693 | FX_PROTECT | |
| 131 | |||
| 132 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 133 | /* Start transaction. */ | ||
| 134 | 3400750 | _fx_fault_tolerant_transaction_start(media_ptr); | |
| 135 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 136 | |||
| 137 | /* Make sure this file is open for writing. */ | ||
| 138 |
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3400900 | if (file_ptr -> fx_file_open_mode != FX_OPEN_FOR_WRITE) |
| 139 | { | ||
| 140 | |||
| 141 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 142 | 8 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 143 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 144 | |||
| 145 | /* Release media protection. */ | ||
| 146 | 7 | FX_UNPROTECT | |
| 147 | |||
| 148 | /* Return the access error exception - a write was attempted from | ||
| 149 | a file opened for reading! */ | ||
| 150 | 13 | return(FX_ACCESS_ERROR); | |
| 151 | } | ||
| 152 | |||
| 153 | /* Check for write protect at the media level (set by driver). */ | ||
| 154 |
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3400887 | if (media_ptr -> fx_media_driver_write_protect) |
| 155 | { | ||
| 156 | |||
| 157 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 158 | 8 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 159 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 160 | |||
| 161 | /* Release media protection. */ | ||
| 162 | 7 | FX_UNPROTECT | |
| 163 | |||
| 164 | /* Return write protect error. */ | ||
| 165 | 13 | return(FX_WRITE_PROTECT); | |
| 166 | } | ||
| 167 | |||
| 168 | /* Calculate the number of bytes per cluster. */ | ||
| 169 | 3400874 | bytes_per_cluster = ((ULONG)media_ptr -> fx_media_bytes_per_sector) * | |
| 170 | 3400874 | ((ULONG)media_ptr -> fx_media_sectors_per_cluster); | |
| 171 | |||
| 172 | /* Check for invalid value. */ | ||
| 173 |
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3400874 | if (bytes_per_cluster == 0) |
| 174 | { | ||
| 175 | |||
| 176 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 177 | 4 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 178 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 179 | |||
| 180 | /* Release media protection. */ | ||
| 181 | 5 | FX_UNPROTECT | |
| 182 | |||
| 183 | /* Invalid media, return error. */ | ||
| 184 | 9 | return(FX_MEDIA_INVALID); | |
| 185 | } | ||
| 186 | |||
| 187 | /* Setup the new file available size - if less than the current available size. */ | ||
| 188 |
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3400865 | if (size < file_ptr -> fx_file_current_available_size) |
| 189 | { | ||
| 190 | |||
| 191 | /* Yes, the file needs to be truncated. */ | ||
| 192 | |||
| 193 | /* Update the available file size. */ | ||
| 194 | 3400815 | file_ptr -> fx_file_current_available_size = ((size + bytes_per_cluster - 1) / bytes_per_cluster) * bytes_per_cluster; | |
| 195 | |||
| 196 | /* Is the new available size less than the actual file size? */ | ||
| 197 |
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3400815 | if (size < file_ptr -> fx_file_current_file_size) |
| 198 | { | ||
| 199 | |||
| 200 | /* Setup the new file size. */ | ||
| 201 | 3400801 | file_ptr -> fx_file_current_file_size = size; | |
| 202 | |||
| 203 | /* Set the modified flag. */ | ||
| 204 | 3400801 | file_ptr -> fx_file_modified = FX_TRUE; | |
| 205 | |||
| 206 | /* Copy the new file size into the directory entry. */ | ||
| 207 | 3400801 | file_ptr -> fx_file_dir_entry.fx_dir_entry_file_size = size; | |
| 208 | |||
| 209 | /* Set the first cluster to NULL. */ | ||
| 210 |
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3400801 | if (size == 0) |
| 211 | { | ||
| 212 | |||
| 213 | /* Yes, the first cluster needs to be cleared since the entire | ||
| 214 | file is going to be truncated. */ | ||
| 215 | 3400543 | file_ptr -> fx_file_dir_entry.fx_dir_entry_cluster = FX_NULL; | |
| 216 | } | ||
| 217 | |||
| 218 | /* Write the directory entry to the media. */ | ||
| 219 | 3400801 | status = _fx_directory_entry_write(media_ptr, &(file_ptr -> fx_file_dir_entry)); | |
| 220 | |||
| 221 | /* Check for a good status. */ | ||
| 222 |
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3400801 | if (status != FX_SUCCESS) |
| 223 | { | ||
| 224 | |||
| 225 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 226 | 10 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 227 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 228 | |||
| 229 | /* Release media protection. */ | ||
| 230 | 8 | FX_UNPROTECT | |
| 231 | |||
| 232 | /* Error writing the directory. */ | ||
| 233 | 15 | return(status); | |
| 234 | } | ||
| 235 | } | ||
| 236 | |||
| 237 | /* Update the trace event with the truncated size. */ | ||
| 238 | FX_TRACE_EVENT_UPDATE(trace_event, trace_timestamp, FX_TRACE_FILE_TRUNCATE_RELEASE, 0, 0, 0, file_ptr -> fx_file_current_file_size) | ||
| 239 | } | ||
| 240 | else | ||
| 241 | { | ||
| 242 | |||
| 243 | /* Update the trace event with the truncated size. */ | ||
| 244 | FX_TRACE_EVENT_UPDATE(trace_event, trace_timestamp, FX_TRACE_FILE_TRUNCATE_RELEASE, 0, 0, 0, file_ptr -> fx_file_current_file_size) | ||
| 245 | |||
| 246 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 247 | 45 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 248 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 249 | |||
| 250 | /* Release media protection. */ | ||
| 251 | 42 | FX_UNPROTECT | |
| 252 | |||
| 253 | /* Just return, the truncate size is larger than the available size. */ | ||
| 254 | 50 | return(FX_SUCCESS); | |
| 255 | } | ||
| 256 | |||
| 257 | /* Calculate the number of bytes per cluster. */ | ||
| 258 | 3400800 | bytes_per_cluster = ((ULONG)media_ptr -> fx_media_bytes_per_sector) * | |
| 259 | 3400800 | ((ULONG)media_ptr -> fx_media_sectors_per_cluster); | |
| 260 | |||
| 261 | /* Now check to see if the read/write internal file pointers need | ||
| 262 | to be adjusted. */ | ||
| 263 |
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3400800 | if (file_ptr -> fx_file_current_file_offset > file_ptr -> fx_file_current_file_size) |
| 264 | { | ||
| 265 | |||
| 266 | |||
| 267 | /* At this point, we are ready to walk list of clusters to setup the | ||
| 268 | seek position of this file. */ | ||
| 269 | 3400732 | cluster = file_ptr -> fx_file_first_physical_cluster; | |
| 270 | 3400732 | bytes_remaining = size; | |
| 271 | 3400732 | last_cluster = 0; | |
| 272 | 3400732 | cluster_count = 0; | |
| 273 | |||
| 274 | /* Follow the link of FAT entries. */ | ||
| 275 |
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3403567 | while ((cluster >= FX_FAT_ENTRY_START) && (cluster < media_ptr -> fx_media_fat_reserved)) |
| 276 | { | ||
| 277 | |||
| 278 | /* Increment the number of clusters. */ | ||
| 279 | 3403549 | cluster_count++; | |
| 280 | |||
| 281 | |||
| 282 | /* Read the current cluster entry from the FAT. */ | ||
| 283 | 3403549 | status = _fx_utility_FAT_entry_read(media_ptr, cluster, &contents); | |
| 284 | |||
| 285 | /* Check the return value. */ | ||
| 286 |
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3403549 | if (status != FX_SUCCESS) |
| 287 | { | ||
| 288 | |||
| 289 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 290 | 8 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 291 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 292 | |||
| 293 | /* Release media protection. */ | ||
| 294 | 7 | FX_UNPROTECT | |
| 295 | |||
| 296 | /* Return the error status. */ | ||
| 297 | 13 | return(status); | |
| 298 | } | ||
| 299 | |||
| 300 | /* Save the last valid cluster. */ | ||
| 301 | 3403536 | last_cluster = cluster; | |
| 302 | |||
| 303 | /* Setup for the next cluster. */ | ||
| 304 | 3403536 | cluster = contents; | |
| 305 | |||
| 306 | /* Determine if this is the last written cluster. */ | ||
| 307 |
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3403536 | if (bytes_remaining >= bytes_per_cluster) |
| 308 | { | ||
| 309 | |||
| 310 | /* Still more seeking, just decrement the working byte offset. */ | ||
| 311 | 2835 | bytes_remaining = bytes_remaining - bytes_per_cluster; | |
| 312 | } | ||
| 313 | else | ||
| 314 | { | ||
| 315 | |||
| 316 | /* This is the cluster that contains the seek position. */ | ||
| 317 | 3400701 | break; | |
| 318 | } | ||
| 319 | } | ||
| 320 | |||
| 321 | /* Check for errors in traversal of the FAT chain. */ | ||
| 322 |
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3400719 | if (size > (((ULONG64) bytes_per_cluster) * ((ULONG64) cluster_count))) |
| 323 | { | ||
| 324 | |||
| 325 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 326 | 8 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 327 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 328 | |||
| 329 | /* Release media protection. */ | ||
| 330 | 10 | FX_UNPROTECT | |
| 331 | |||
| 332 | /* This is an error that suggests a corrupt file. */ | ||
| 333 | 18 | return(FX_FILE_CORRUPT); | |
| 334 | } | ||
| 335 | |||
| 336 | /* Position the pointers to the new offset. */ | ||
| 337 | 3400701 | file_ptr -> fx_file_current_physical_cluster = last_cluster; | |
| 338 | 3400701 | file_ptr -> fx_file_current_relative_cluster = cluster_count - 1; | |
| 339 | 3400701 | file_ptr -> fx_file_current_logical_sector = ((ULONG)media_ptr -> fx_media_data_sector_start) + | |
| 340 | 3400701 | (((ULONG64)file_ptr -> fx_file_current_physical_cluster - FX_FAT_ENTRY_START) * | |
| 341 | 3400701 | ((ULONG)media_ptr -> fx_media_sectors_per_cluster)) + | |
| 342 | 3400701 | (bytes_remaining / (ULONG)media_ptr -> fx_media_bytes_per_sector); | |
| 343 | 3400701 | file_ptr -> fx_file_current_relative_sector = (UINT)((bytes_remaining / (ULONG)media_ptr -> fx_media_bytes_per_sector)); | |
| 344 | 3400701 | file_ptr -> fx_file_current_file_offset = size; | |
| 345 | 3400701 | file_ptr -> fx_file_current_logical_offset = (ULONG)bytes_remaining % ((ULONG)media_ptr -> fx_media_bytes_per_sector); | |
| 346 | } | ||
| 347 | |||
| 348 | /* Determine how many clusters are actually in-use now. */ | ||
| 349 | 3400769 | cluster_count = (ULONG) (file_ptr -> fx_file_current_available_size + (((ULONG64) bytes_per_cluster) - ((ULONG64) 1)))/bytes_per_cluster; | |
| 350 | |||
| 351 | /* Save the number of clusters in-use. */ | ||
| 352 | 3400769 | file_ptr -> fx_file_total_clusters = cluster_count; | |
| 353 | |||
| 354 | /* At this point, we are ready to walk list of clusters to find the clusters | ||
| 355 | that can be released. */ | ||
| 356 | 3400769 | cluster = file_ptr -> fx_file_first_physical_cluster; | |
| 357 | |||
| 358 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 359 | /* Is this the last used cluster? */ | ||
| 360 |
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3400659 | if ((cluster_count == 0) && (media_ptr -> fx_media_fault_tolerant_enabled)) |
| 361 | { | ||
| 362 | |||
| 363 | /* Set undo log. */ | ||
| 364 | 3400453 | status = _fx_fault_tolerant_set_FAT_chain(media_ptr, FX_FALSE, FX_FREE_CLUSTER, | |
| 365 | media_ptr -> fx_media_fat_last, cluster, media_ptr -> fx_media_fat_last); | ||
| 366 | |||
| 367 | /* Determine if the write was successful. */ | ||
| 368 |
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3400445 | if (status != FX_SUCCESS) |
| 369 | { | ||
| 370 | |||
| 371 | 4 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 372 | |||
| 373 | /* Release media protection. */ | ||
| 374 | 2 | FX_UNPROTECT | |
| 375 | |||
| 376 | /* Return the error code. */ | ||
| 377 | 4 | return(status); | |
| 378 | } | ||
| 379 | |||
| 380 | 3400441 | file_ptr -> fx_file_last_physical_cluster = cluster; | |
| 381 | } | ||
| 382 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 383 | |||
| 384 | /* Follow the link of FAT entries. */ | ||
| 385 |
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32935961 | while ((cluster >= FX_FAT_ENTRY_START) && (cluster < media_ptr -> fx_media_fat_reserved)) |
| 386 | { | ||
| 387 | |||
| 388 | /* Read the current cluster entry from the FAT. */ | ||
| 389 | 29535269 | status = _fx_utility_FAT_entry_read(media_ptr, cluster, &contents); | |
| 390 | |||
| 391 | /* Check the return value. */ | ||
| 392 |
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29535269 | if (status != FX_SUCCESS) |
| 393 | { | ||
| 394 | |||
| 395 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 396 | 26 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 397 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 398 | |||
| 399 | /* Release media protection. */ | ||
| 400 | 16 | FX_UNPROTECT | |
| 401 | |||
| 402 | /* Return the error status. */ | ||
| 403 | 31 | return(status); | |
| 404 | } | ||
| 405 | |||
| 406 | /* Determine if are more clusters to release. */ | ||
| 407 |
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29535238 | if (cluster_count > 0) |
| 408 | { | ||
| 409 | |||
| 410 | /* Decrement the number of clusters. */ | ||
| 411 | 3010 | cluster_count--; | |
| 412 | |||
| 413 | /* Is this the last used cluster? */ | ||
| 414 |
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3010 | if (cluster_count == 0) |
| 415 | { | ||
| 416 | { | ||
| 417 | |||
| 418 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 419 |
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152 | if (media_ptr -> fx_media_fault_tolerant_enabled) |
| 420 | { | ||
| 421 | |||
| 422 | /* Set undo phase. */ | ||
| 423 | 108 | media_ptr -> fx_media_fault_tolerant_state |= FX_FAULT_TOLERANT_STATE_SET_FAT_CHAIN; | |
| 424 | |||
| 425 | /* Read the current cluster entry from the FAT. */ | ||
| 426 | 108 | status = _fx_utility_FAT_entry_read(media_ptr, cluster, &contents); | |
| 427 | |||
| 428 | /* Check the return value. */ | ||
| 429 |
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108 | if (status != FX_SUCCESS) |
| 430 | { | ||
| 431 | |||
| 432 | 4 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 433 | |||
| 434 | /* Release media protection. */ | ||
| 435 | 2 | FX_UNPROTECT | |
| 436 | |||
| 437 | /* Return the error status. */ | ||
| 438 | 4 | return(status); | |
| 439 | } | ||
| 440 | |||
| 441 | /* Set undo log. */ | ||
| 442 | 104 | status = _fx_fault_tolerant_set_FAT_chain(media_ptr, FX_FALSE, cluster, | |
| 443 | media_ptr -> fx_media_fat_last, contents, media_ptr -> fx_media_fat_last); | ||
| 444 | |||
| 445 | /* Determine if the write was successful. */ | ||
| 446 |
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104 | if (status != FX_SUCCESS) |
| 447 | { | ||
| 448 | |||
| 449 | 4 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 450 | |||
| 451 | /* Release media protection. */ | ||
| 452 | 2 | FX_UNPROTECT | |
| 453 | |||
| 454 | /* Return the error code. */ | ||
| 455 | 4 | return(status); | |
| 456 | } | ||
| 457 | } | ||
| 458 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 459 | |||
| 460 | /* Yes, it should be designated as last cluster. */ | ||
| 461 | 194 | status = _fx_utility_FAT_entry_write(media_ptr, cluster, media_ptr -> fx_media_fat_last); | |
| 462 | |||
| 463 | /* Check the return value. */ | ||
| 464 |
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194 | if (status) |
| 465 | { | ||
| 466 | |||
| 467 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 468 | 8 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 469 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 470 | |||
| 471 | /* Release media protection. */ | ||
| 472 | 7 | FX_UNPROTECT | |
| 473 | |||
| 474 | /* Return the error status. */ | ||
| 475 | 13 | return(status); | |
| 476 | } | ||
| 477 | |||
| 478 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 479 |
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136 | if (media_ptr -> fx_media_fault_tolerant_enabled) |
| 480 | { | ||
| 481 | |||
| 482 | /* Clear undo phase. */ | ||
| 483 | 96 | media_ptr -> fx_media_fault_tolerant_state &= (UCHAR)(~FX_FAULT_TOLERANT_STATE_SET_FAT_CHAIN & 0xff); | |
| 484 | } | ||
| 485 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 486 | } | ||
| 487 | |||
| 488 | 181 | file_ptr -> fx_file_last_physical_cluster = cluster; | |
| 489 | |||
| 490 | #ifdef FX_FAULT_TOLERANT | ||
| 491 | |||
| 492 | /* Flush the cached individual FAT entries. */ | ||
| 493 | 136 | status = _fx_utility_FAT_flush(media_ptr); | |
| 494 | |||
| 495 | /* Check the return value. */ | ||
| 496 |
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136 | if (status) |
| 497 | { | ||
| 498 | |||
| 499 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 500 | 4 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 501 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 502 | |||
| 503 | /* Release media protection. */ | ||
| 504 | 2 | FX_UNPROTECT | |
| 505 | |||
| 506 | /* Return the error status. */ | ||
| 507 | 4 | return(status); | |
| 508 | } | ||
| 509 | #endif | ||
| 510 | } | ||
| 511 | } | ||
| 512 | else | ||
| 513 | { | ||
| 514 | |||
| 515 | /* This is a cluster after the clusters used by the file, release | ||
| 516 | it back to the media. */ | ||
| 517 | |||
| 518 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 519 |
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29460703 | if (media_ptr -> fx_media_fault_tolerant_enabled == FX_FALSE) |
| 520 | { | ||
| 521 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 522 | |||
| 523 | 128761 | status = _fx_utility_FAT_entry_write(media_ptr, cluster, FX_FREE_CLUSTER); | |
| 524 | |||
| 525 | /* Check the return value. */ | ||
| 526 |
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128761 | if (status) |
| 527 | { | ||
| 528 | |||
| 529 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 530 | 4 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 531 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 532 | |||
| 533 | /* Release media protection. */ | ||
| 534 | 5 | FX_UNPROTECT | |
| 535 | |||
| 536 | /* Return the error status. */ | ||
| 537 | 9 | return(status); | |
| 538 | } | ||
| 539 | |||
| 540 | /* Increment the number of available clusters. */ | ||
| 541 | 128752 | media_ptr -> fx_media_available_clusters++; | |
| 542 | |||
| 543 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 544 | } | ||
| 545 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 546 | } | ||
| 547 | |||
| 548 | /* Setup for the next cluster. */ | ||
| 549 | 29535204 | cluster = contents; | |
| 550 | } | ||
| 551 | |||
| 552 | /* Determine if we need to adjust the number of leading consecutive clusters. */ | ||
| 553 |
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3400692 | if (file_ptr -> fx_file_consecutive_cluster > file_ptr -> fx_file_total_clusters) |
| 554 | { | ||
| 555 | |||
| 556 | /* Adjust the leading consecutive cluster count. */ | ||
| 557 | 3400555 | file_ptr -> fx_file_consecutive_cluster = file_ptr -> fx_file_total_clusters; | |
| 558 | } | ||
| 559 | |||
| 560 | /* Determine if the file available size has been truncated to zero. */ | ||
| 561 |
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3400692 | if (file_ptr -> fx_file_current_available_size == 0) |
| 562 | { | ||
| 563 | |||
| 564 | /* Yes, the first cluster has already been released. Update the file info | ||
| 565 | to indicate the file has no clusters. */ | ||
| 566 | 3400531 | file_ptr -> fx_file_last_physical_cluster = 0; | |
| 567 | 3400531 | file_ptr -> fx_file_first_physical_cluster = 0; | |
| 568 | 3400531 | file_ptr -> fx_file_current_physical_cluster = 0; | |
| 569 | 3400531 | file_ptr -> fx_file_current_logical_sector = 0; | |
| 570 | 3400531 | file_ptr -> fx_file_current_relative_cluster = 0; | |
| 571 | 3400531 | file_ptr -> fx_file_current_relative_sector = 0; | |
| 572 | 3400531 | file_ptr -> fx_file_current_available_size = 0; | |
| 573 | 3400531 | file_ptr -> fx_file_consecutive_cluster = 1; | |
| 574 | } | ||
| 575 | |||
| 576 | #ifndef FX_DONT_UPDATE_OPEN_FILES | ||
| 577 | |||
| 578 | /* Search the opened files list to see if the same file is opened for reading. */ | ||
| 579 | 3400692 | open_count = media_ptr -> fx_media_opened_file_count; | |
| 580 | 3400692 | search_ptr = media_ptr -> fx_media_opened_file_list; | |
| 581 |
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6801528 | while (open_count) |
| 582 | { | ||
| 583 | |||
| 584 | /* Is this file the same file opened for reading? */ | ||
| 585 |
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3400863 | if ((search_ptr != file_ptr) && |
| 586 | 171 | (search_ptr -> fx_file_dir_entry.fx_dir_entry_log_sector == | |
| 587 |
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171 | file_ptr -> fx_file_dir_entry.fx_dir_entry_log_sector) && |
| 588 | 135 | (search_ptr -> fx_file_dir_entry.fx_dir_entry_byte_offset == | |
| 589 |
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|
135 | file_ptr -> fx_file_dir_entry.fx_dir_entry_byte_offset)) |
| 590 | { | ||
| 591 | |||
| 592 | /* Yes, the same file is opened for reading. */ | ||
| 593 | |||
| 594 | /* Setup the new file size. */ | ||
| 595 | 81 | search_ptr -> fx_file_current_file_size = size; | |
| 596 | |||
| 597 | /* Setup the new total clusters. */ | ||
| 598 | 81 | search_ptr -> fx_file_total_clusters = file_ptr -> fx_file_total_clusters; | |
| 599 | |||
| 600 | /* Copy the directory entry. */ | ||
| 601 | 81 | search_ptr -> fx_file_dir_entry.fx_dir_entry_cluster = file_ptr -> fx_file_dir_entry.fx_dir_entry_cluster; | |
| 602 | 81 | search_ptr -> fx_file_dir_entry.fx_dir_entry_file_size = file_ptr -> fx_file_dir_entry.fx_dir_entry_file_size; | |
| 603 | 81 | search_ptr -> fx_file_dir_entry.fx_dir_entry_log_sector = file_ptr -> fx_file_dir_entry.fx_dir_entry_log_sector; | |
| 604 | 81 | search_ptr -> fx_file_dir_entry.fx_dir_entry_byte_offset = file_ptr -> fx_file_dir_entry.fx_dir_entry_byte_offset; | |
| 605 | |||
| 606 | /* Setup the other file parameters. */ | ||
| 607 | 81 | search_ptr -> fx_file_last_physical_cluster = file_ptr -> fx_file_last_physical_cluster; | |
| 608 | 81 | search_ptr -> fx_file_first_physical_cluster = file_ptr -> fx_file_first_physical_cluster; | |
| 609 | 81 | search_ptr -> fx_file_current_available_size = file_ptr -> fx_file_current_available_size; | |
| 610 | 81 | search_ptr -> fx_file_consecutive_cluster = file_ptr -> fx_file_consecutive_cluster; | |
| 611 | |||
| 612 | /* Determine if the truncated file is smaller than the current file offset. */ | ||
| 613 |
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81 | if (search_ptr -> fx_file_current_file_offset > size) |
| 614 | { | ||
| 615 | |||
| 616 | /* Yes, the current file parameters need to be changed since the file was | ||
| 617 | truncated to a position prior to the current file position. */ | ||
| 618 | |||
| 619 | /* Calculate the number of bytes per cluster. */ | ||
| 620 | 63 | bytes_per_cluster = ((ULONG)media_ptr -> fx_media_bytes_per_sector) * | |
| 621 | 63 | ((ULONG)media_ptr -> fx_media_sectors_per_cluster); | |
| 622 | |||
| 623 | /* At this point, we are ready to walk list of clusters to setup the | ||
| 624 | seek position of this file. */ | ||
| 625 | 63 | cluster = search_ptr -> fx_file_first_physical_cluster; | |
| 626 | 63 | bytes_remaining = size; | |
| 627 | 63 | last_cluster = 0; | |
| 628 | 63 | cluster_count = 0; | |
| 629 | |||
| 630 | /* Follow the link of FAT entries. */ | ||
| 631 |
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|
342 | while ((cluster >= FX_FAT_ENTRY_START) && (cluster < media_ptr -> fx_media_fat_reserved)) |
| 632 | { | ||
| 633 | |||
| 634 | /* Increment the number of clusters. */ | ||
| 635 | 315 | cluster_count++; | |
| 636 | |||
| 637 | |||
| 638 | /* Read the current cluster entry from the FAT. */ | ||
| 639 | 315 | status = _fx_utility_FAT_entry_read(media_ptr, cluster, &contents); | |
| 640 | |||
| 641 | /* Check the return value. */ | ||
| 642 |
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|
315 | if (status != FX_SUCCESS) |
| 643 | { | ||
| 644 | |||
| 645 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 646 | 4 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 647 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 648 | |||
| 649 | /* Release media protection. */ | ||
| 650 | 5 | FX_UNPROTECT | |
| 651 | |||
| 652 | /* Return the error status. */ | ||
| 653 | 9 | return(status); | |
| 654 | } | ||
| 655 | |||
| 656 | /* Save the last valid cluster. */ | ||
| 657 | 306 | last_cluster = cluster; | |
| 658 | |||
| 659 | /* Setup for the next cluster. */ | ||
| 660 | 306 | cluster = contents; | |
| 661 | |||
| 662 | /* Determine if this is the last written cluster. */ | ||
| 663 |
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306 | if (bytes_remaining >= bytes_per_cluster) |
| 664 | { | ||
| 665 | |||
| 666 | /* Still more seeking, just decrement the working byte offset. */ | ||
| 667 | 279 | bytes_remaining = bytes_remaining - bytes_per_cluster; | |
| 668 | } | ||
| 669 | else | ||
| 670 | { | ||
| 671 | |||
| 672 | /* This is the cluster that contains the seek position. */ | ||
| 673 | 27 | break; | |
| 674 | } | ||
| 675 | } | ||
| 676 | |||
| 677 | /* Check for errors in traversal of the FAT chain. */ | ||
| 678 |
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54 | if (size > (((ULONG64) bytes_per_cluster) * ((ULONG64) cluster_count))) |
| 679 | { | ||
| 680 | |||
| 681 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 682 | 8 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 683 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 684 | |||
| 685 | /* Release media protection. */ | ||
| 686 | 10 | FX_UNPROTECT | |
| 687 | |||
| 688 | /* This is an error that suggests a corrupt file. */ | ||
| 689 | 18 | return(FX_FILE_CORRUPT); | |
| 690 | } | ||
| 691 | |||
| 692 | /* Position the pointers to the new offset. */ | ||
| 693 | |||
| 694 | /* Determine if there is at least one cluster. */ | ||
| 695 |
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36 | if (cluster_count) |
| 696 | { | ||
| 697 | |||
| 698 | /* Calculate real file parameters. */ | ||
| 699 | 27 | search_ptr -> fx_file_current_physical_cluster = last_cluster; | |
| 700 | 27 | search_ptr -> fx_file_current_relative_cluster = cluster_count - 1; | |
| 701 | 27 | search_ptr -> fx_file_current_logical_sector = ((ULONG)media_ptr -> fx_media_data_sector_start) + | |
| 702 | 27 | (((ULONG64)search_ptr -> fx_file_current_physical_cluster - FX_FAT_ENTRY_START) * | |
| 703 | 27 | ((ULONG)media_ptr -> fx_media_sectors_per_cluster)) + | |
| 704 | 27 | (bytes_remaining / (ULONG)media_ptr -> fx_media_bytes_per_sector); | |
| 705 | 27 | search_ptr -> fx_file_current_relative_sector = (UINT)((bytes_remaining / (ULONG)media_ptr -> fx_media_bytes_per_sector)); | |
| 706 | 27 | search_ptr -> fx_file_current_file_offset = size; | |
| 707 | 27 | search_ptr -> fx_file_current_logical_offset = (ULONG)bytes_remaining % ((ULONG)media_ptr -> fx_media_bytes_per_sector); | |
| 708 | } | ||
| 709 | else | ||
| 710 | { | ||
| 711 | |||
| 712 | /* Calculate zero-length file parameters. */ | ||
| 713 | 9 | search_ptr -> fx_file_current_physical_cluster = 0; | |
| 714 | 9 | search_ptr -> fx_file_current_relative_cluster = 0; | |
| 715 | 9 | search_ptr -> fx_file_current_logical_sector = 0; | |
| 716 | 9 | search_ptr -> fx_file_current_relative_sector = 0; | |
| 717 | 9 | search_ptr -> fx_file_current_file_offset = 0; | |
| 718 | 9 | search_ptr -> fx_file_current_logical_offset = 0; | |
| 719 | } | ||
| 720 | } | ||
| 721 | } | ||
| 722 | |||
| 723 | /* Adjust the pointer and decrement the search count. */ | ||
| 724 | 3400836 | search_ptr = search_ptr -> fx_file_opened_next; | |
| 725 | 3400836 | open_count--; | |
| 726 | } | ||
| 727 | #endif | ||
| 728 | |||
| 729 | #ifdef FX_FAULT_TOLERANT | ||
| 730 | |||
| 731 | /* Flush the cached individual FAT entries */ | ||
| 732 | 3400585 | status = _fx_utility_FAT_flush(media_ptr); | |
| 733 | |||
| 734 | /* Check the return value. */ | ||
| 735 |
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3400585 | if (status) |
| 736 | { | ||
| 737 | |||
| 738 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 739 | 4 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 740 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 741 | |||
| 742 | /* Release media protection. */ | ||
| 743 | 2 | FX_UNPROTECT | |
| 744 | |||
| 745 | /* Return the error status. */ | ||
| 746 | 4 | return(status); | |
| 747 | } | ||
| 748 | |||
| 749 | #endif | ||
| 750 | |||
| 751 | #ifdef FX_ENABLE_FAULT_TOLERANT | ||
| 752 |
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3400581 | if (media_ptr -> fx_media_fault_tolerant_enabled && |
| 753 |
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3400517 | (media_ptr -> fx_media_fault_tolerant_state & FX_FAULT_TOLERANT_STATE_STARTED)) |
| 754 | { | ||
| 755 | |||
| 756 | /* Copy the new file size into the directory entry. */ | ||
| 757 | 3400513 | file_ptr -> fx_file_dir_entry.fx_dir_entry_file_size = file_ptr -> fx_file_current_file_size; | |
| 758 | } | ||
| 759 | |||
| 760 | /* Write the directory entry to the media. */ | ||
| 761 | 3400581 | status = _fx_directory_entry_write(media_ptr, &(file_ptr -> fx_file_dir_entry)); | |
| 762 | |||
| 763 | /* Check for a good status. */ | ||
| 764 |
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3400581 | if (status != FX_SUCCESS) |
| 765 | { | ||
| 766 | |||
| 767 | 4 | FX_FAULT_TOLERANT_TRANSACTION_FAIL(media_ptr); | |
| 768 | |||
| 769 | /* Release media protection. */ | ||
| 770 | 2 | FX_UNPROTECT | |
| 771 | |||
| 772 | /* Error writing the directory. */ | ||
| 773 | 4 | return(status); | |
| 774 | } | ||
| 775 | |||
| 776 | /* End transaction. */ | ||
| 777 | 3400577 | status = _fx_fault_tolerant_transaction_end(media_ptr); | |
| 778 | |||
| 779 | /* Check for a bad status. */ | ||
| 780 |
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3400499 | if (status != FX_SUCCESS) |
| 781 | { | ||
| 782 | |||
| 783 | /* Release media protection. */ | ||
| 784 | 6 | FX_UNPROTECT | |
| 785 | |||
| 786 | /* Return the bad status. */ | ||
| 787 | 12 | return(status); | |
| 788 | } | ||
| 789 | |||
| 790 | /* Update maximum size used if necessary. */ | ||
| 791 |
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3400487 | if (size < file_ptr -> fx_file_maximum_size_used) |
| 792 | { | ||
| 793 | 3400467 | file_ptr -> fx_file_maximum_size_used = size; | |
| 794 | } | ||
| 795 | #endif /* FX_ENABLE_FAULT_TOLERANT */ | ||
| 796 | |||
| 797 | /* Release media protection. */ | ||
| 798 | 3400489 | FX_UNPROTECT | |
| 799 | |||
| 800 | /* Truncate is complete, return successful status. */ | ||
| 801 | 3400564 | return(FX_SUCCESS); | |
| 802 | } | ||
| 803 | |||
| 804 |