Mercurial > yaffs-ecoscentric
annotate packages/fs/yaffs/current/src/yaffs_guts.h @ 353:fa7270d25c51
Merge from upstream
| author | Ross Younger <wry@ecoscentric.com> |
|---|---|
| date | Tue, 17 Nov 2009 10:49:51 +0000 |
| parents | yaffs_guts.h@88c898910859 yaffs_guts.h@1c56b1df53d8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * YAFFS: Yet another Flash File System . A NAND-flash specific file system. |
| 0 | 3 * |
| 174 | 4 * Copyright (C) 2002-2007 Aleph One Ltd. |
| 0 | 5 * for Toby Churchill Ltd and Brightstar Engineering |
| 6 * | |
| 7 * Created by Charles Manning <charles@aleph1.co.uk> | |
| 8 * | |
| 9 * This program is free software; you can redistribute it and/or modify | |
| 10 * it under the terms of the GNU Lesser General Public License version 2.1 as | |
| 11 * published by the Free Software Foundation. | |
| 12 * | |
| 13 * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. | |
| 14 */ | |
| 15 | |
| 16 #ifndef __YAFFS_GUTS_H__ | |
| 17 #define __YAFFS_GUTS_H__ | |
| 18 | |
| 19 #include "devextras.h" | |
| 20 #include "yportenv.h" | |
| 21 | |
| 22 #define YAFFS_OK 1 | |
| 23 #define YAFFS_FAIL 0 | |
| 24 | |
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25 /* Give us a Y=0x59, |
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26 * Give us an A=0x41, |
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27 * Give us an FF=0xFF |
| 81 | 28 * Give us an S=0x53 |
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29 * And what have we got... |
| 81 | 30 */ |
| 77 | 31 #define YAFFS_MAGIC 0x5941FF53 |
| 0 | 32 |
| 33 #define YAFFS_NTNODES_LEVEL0 16 | |
| 34 #define YAFFS_TNODES_LEVEL0_BITS 4 | |
| 35 #define YAFFS_TNODES_LEVEL0_MASK 0xf | |
| 36 | |
| 37 #define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2) | |
| 38 #define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1) | |
| 39 #define YAFFS_TNODES_INTERNAL_MASK 0x7 | |
| 40 #define YAFFS_TNODES_MAX_LEVEL 6 | |
| 41 | |
| 42 #ifndef CONFIG_YAFFS_NO_YAFFS1 | |
| 43 #define YAFFS_BYTES_PER_SPARE 16 | |
| 44 #define YAFFS_BYTES_PER_CHUNK 512 | |
| 45 #define YAFFS_CHUNK_SIZE_SHIFT 9 | |
| 46 #define YAFFS_CHUNKS_PER_BLOCK 32 | |
| 47 #define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK) | |
| 48 #endif | |
| 49 | |
| 7 | 50 #define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024 |
| 51 #define YAFFS_MIN_YAFFS2_SPARE_SIZE 32 | |
| 52 | |
| 77 | 53 #define YAFFS_MAX_CHUNK_ID 0x000FFFFF |
| 0 | 54 |
| 55 #define YAFFS_UNUSED_OBJECT_ID 0x0003FFFF | |
| 56 | |
| 57 #define YAFFS_ALLOCATION_NOBJECTS 100 | |
| 58 #define YAFFS_ALLOCATION_NTNODES 100 | |
| 59 #define YAFFS_ALLOCATION_NLINKS 100 | |
| 60 | |
| 61 #define YAFFS_NOBJECT_BUCKETS 256 | |
| 62 | |
| 131 | 63 |
| 77 | 64 #define YAFFS_OBJECT_SPACE 0x40000 |
| 0 | 65 |
| 182 | 66 #define YAFFS_CHECKPOINT_VERSION 3 |
| 153 | 67 |
| 0 | 68 #ifdef CONFIG_YAFFS_UNICODE |
| 69 #define YAFFS_MAX_NAME_LENGTH 127 | |
| 70 #define YAFFS_MAX_ALIAS_LENGTH 79 | |
| 71 #else | |
| 72 #define YAFFS_MAX_NAME_LENGTH 255 | |
| 73 #define YAFFS_MAX_ALIAS_LENGTH 159 | |
| 74 #endif | |
| 75 | |
| 76 #define YAFFS_SHORT_NAME_LENGTH 15 | |
| 77 | |
| 131 | 78 /* Some special object ids for pseudo objects */ |
| 77 | 79 #define YAFFS_OBJECTID_ROOT 1 |
| 0 | 80 #define YAFFS_OBJECTID_LOSTNFOUND 2 |
| 81 #define YAFFS_OBJECTID_UNLINKED 3 | |
| 82 #define YAFFS_OBJECTID_DELETED 4 | |
| 83 | |
| 131 | 84 /* Sseudo object ids for checkpointing */ |
| 85 #define YAFFS_OBJECTID_SB_HEADER 0x10 | |
| 86 #define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20 | |
| 134 | 87 #define YAFFS_SEQUENCE_CHECKPOINT_DATA 0x21 |
| 131 | 88 |
| 89 /* */ | |
| 90 | |
| 0 | 91 #define YAFFS_MAX_SHORT_OP_CACHES 20 |
| 92 | |
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93 #define YAFFS_N_TEMP_BUFFERS CYGNUM_FS_YAFFS_TEMP_BUFFERS |
| 0 | 94 |
| 185 | 95 /* We limit the number attempts at sucessfully saving a chunk of data. |
| 96 * Small-page devices have 32 pages per block; large-page devices have 64. | |
| 97 * Default to something in the order of 5 to 10 blocks worth of chunks. | |
| 98 */ | |
| 99 #define YAFFS_WR_ATTEMPTS (5*64) | |
| 100 | |
| 81 | 101 /* Sequence numbers are used in YAFFS2 to determine block allocation order. |
| 102 * The range is limited slightly to help distinguish bad numbers from good. | |
| 103 * This also allows us to perhaps in the future use special numbers for | |
| 104 * special purposes. | |
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105 * EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years, |
| 81 | 106 * and is a larger number than the lifetime of a 2GB device. |
| 107 */ | |
| 0 | 108 #define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000 |
| 109 #define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xEFFFFF00 | |
| 110 | |
| 270 | 111 /* Special sequence number for bad block that failed to be marked bad */ |
| 112 #define YAFFS_SEQUENCE_BAD_BLOCK 0xFFFF0000 | |
| 113 | |
| 81 | 114 /* ChunkCache is used for short read/write operations.*/ |
| 77 | 115 typedef struct { |
| 0 | 116 struct yaffs_ObjectStruct *object; |
| 117 int chunkId; | |
| 118 int lastUse; | |
| 77 | 119 int dirty; |
| 81 | 120 int nBytes; /* Only valid if the cache is dirty */ |
| 121 int locked; /* Can't push out or flush while locked. */ | |
| 4 | 122 #ifdef CONFIG_YAFFS_YAFFS2 |
| 0 | 123 __u8 *data; |
| 124 #else | |
| 125 __u8 data[YAFFS_BYTES_PER_CHUNK]; | |
| 126 #endif | |
| 127 } yaffs_ChunkCache; | |
| 128 | |
| 81 | 129 |
| 130 | |
| 131 /* Tags structures in RAM | |
| 132 * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise | |
| 133 * the structure size will get blown out. | |
| 134 */ | |
| 135 | |
| 0 | 136 #ifndef CONFIG_YAFFS_NO_YAFFS1 |
| 77 | 137 typedef struct { |
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138 unsigned chunkId:20; |
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139 unsigned serialNumber:2; |
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140 unsigned byteCountLSB:10; |
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141 unsigned objectId:18; |
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142 unsigned ecc:12; |
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143 unsigned byteCountMSB:2; |
| 0 | 144 } yaffs_Tags; |
| 145 | |
| 77 | 146 typedef union { |
| 147 yaffs_Tags asTags; | |
| 148 __u8 asBytes[8]; | |
| 0 | 149 } yaffs_TagsUnion; |
| 150 | |
| 151 #endif | |
| 152 | |
| 81 | 153 /* Stuff used for extended tags in YAFFS2 */ |
| 154 | |
| 77 | 155 typedef enum { |
| 0 | 156 YAFFS_ECC_RESULT_UNKNOWN, |
| 157 YAFFS_ECC_RESULT_NO_ERROR, | |
| 158 YAFFS_ECC_RESULT_FIXED, | |
| 159 YAFFS_ECC_RESULT_UNFIXED | |
| 160 } yaffs_ECCResult; | |
| 161 | |
| 77 | 162 typedef enum { |
| 15 | 163 YAFFS_OBJECT_TYPE_UNKNOWN, |
| 164 YAFFS_OBJECT_TYPE_FILE, | |
| 165 YAFFS_OBJECT_TYPE_SYMLINK, | |
| 166 YAFFS_OBJECT_TYPE_DIRECTORY, | |
| 167 YAFFS_OBJECT_TYPE_HARDLINK, | |
| 168 YAFFS_OBJECT_TYPE_SPECIAL | |
| 169 } yaffs_ObjectType; | |
| 170 | |
| 182 | 171 #define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL |
| 172 | |
| 77 | 173 typedef struct { |
| 0 | 174 |
| 175 unsigned validMarker0; | |
| 81 | 176 unsigned chunkUsed; /* Status of the chunk: used or unused */ |
| 177 unsigned objectId; /* If 0 then this is not part of an object (unused) */ | |
| 178 unsigned chunkId; /* If 0 then this is a header, else a data chunk */ | |
| 179 unsigned byteCount; /* Only valid for data chunks */ | |
| 77 | 180 |
| 81 | 181 /* The following stuff only has meaning when we read */ |
| 182 yaffs_ECCResult eccResult; | |
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183 unsigned blockBad; |
| 0 | 184 |
| 81 | 185 /* YAFFS 1 stuff */ |
| 186 unsigned chunkDeleted; /* The chunk is marked deleted */ | |
| 187 unsigned serialNumber; /* Yaffs1 2-bit serial number */ | |
| 77 | 188 |
| 81 | 189 /* YAFFS2 stuff */ |
| 190 unsigned sequenceNumber; /* The sequence number of this block */ | |
| 0 | 191 |
| 81 | 192 /* Extra info if this is an object header (YAFFS2 only) */ |
| 77 | 193 |
| 81 | 194 unsigned extraHeaderInfoAvailable; /* There is extra info available if this is not zero */ |
| 195 unsigned extraParentObjectId; /* The parent object */ | |
| 196 unsigned extraIsShrinkHeader; /* Is it a shrink header? */ | |
| 197 unsigned extraShadows; /* Does this shadow another object? */ | |
| 15 | 198 |
| 81 | 199 yaffs_ObjectType extraObjectType; /* What object type? */ |
| 15 | 200 |
| 81 | 201 unsigned extraFileLength; /* Length if it is a file */ |
| 202 unsigned extraEquivalentObjectId; /* Equivalent object Id if it is a hard link */ | |
| 77 | 203 |
| 204 unsigned validMarker1; | |
| 205 | |
| 0 | 206 } yaffs_ExtendedTags; |
| 207 | |
| 81 | 208 /* Spare structure for YAFFS1 */ |
| 77 | 209 typedef struct { |
| 210 __u8 tagByte0; | |
| 211 __u8 tagByte1; | |
| 212 __u8 tagByte2; | |
| 213 __u8 tagByte3; | |
| 81 | 214 __u8 pageStatus; /* set to 0 to delete the chunk */ |
| 77 | 215 __u8 blockStatus; |
| 216 __u8 tagByte4; | |
| 217 __u8 tagByte5; | |
| 218 __u8 ecc1[3]; | |
| 219 __u8 tagByte6; | |
| 220 __u8 tagByte7; | |
| 221 __u8 ecc2[3]; | |
| 0 | 222 } yaffs_Spare; |
| 223 | |
| 81 | 224 /*Special structure for passing through to mtd */ |
| 0 | 225 struct yaffs_NANDSpare { |
| 77 | 226 yaffs_Spare spare; |
| 227 int eccres1; | |
| 228 int eccres2; | |
| 0 | 229 }; |
| 230 | |
| 81 | 231 /* Block data in RAM */ |
| 0 | 232 |
| 233 typedef enum { | |
| 77 | 234 YAFFS_BLOCK_STATE_UNKNOWN = 0, |
| 4 | 235 |
| 0 | 236 YAFFS_BLOCK_STATE_SCANNING, |
| 77 | 237 YAFFS_BLOCK_STATE_NEEDS_SCANNING, |
| 81 | 238 /* The block might have something on it (ie it is allocating or full, perhaps empty) |
| 239 * but it needs to be scanned to determine its true state. | |
| 240 * This state is only valid during yaffs_Scan. | |
| 241 * NB We tolerate empty because the pre-scanner might be incapable of deciding | |
| 242 * However, if this state is returned on a YAFFS2 device, then we expect a sequence number | |
| 243 */ | |
| 77 | 244 |
| 245 YAFFS_BLOCK_STATE_EMPTY, | |
| 81 | 246 /* This block is empty */ |
| 0 | 247 |
| 77 | 248 YAFFS_BLOCK_STATE_ALLOCATING, |
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249 /* This block is partially allocated. |
| 134 | 250 * At least one page holds valid data. |
| 81 | 251 * This is the one currently being used for page |
| 252 * allocation. Should never be more than one of these | |
| 253 */ | |
| 77 | 254 |
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255 YAFFS_BLOCK_STATE_FULL, |
| 81 | 256 /* All the pages in this block have been allocated. |
| 257 */ | |
| 0 | 258 |
| 77 | 259 YAFFS_BLOCK_STATE_DIRTY, |
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260 /* All pages have been allocated and deleted. |
| 81 | 261 * Erase me, reuse me. |
| 262 */ | |
| 77 | 263 |
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264 YAFFS_BLOCK_STATE_CHECKPOINT, |
| 134 | 265 /* This block is assigned to holding checkpoint data. |
| 266 */ | |
| 267 | |
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268 YAFFS_BLOCK_STATE_COLLECTING, |
| 81 | 269 /* This block is being garbage collected */ |
| 77 | 270 |
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271 YAFFS_BLOCK_STATE_DEAD |
| 81 | 272 /* This block has failed and is not in use */ |
| 0 | 273 } yaffs_BlockState; |
| 274 | |
| 182 | 275 #define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1) |
| 276 | |
| 277 | |
| 77 | 278 typedef struct { |
| 0 | 279 |
| 153 | 280 int softDeletions:10; /* number of soft deleted pages */ |
| 281 int pagesInUse:10; /* number of pages in use */ | |
| 185 | 282 unsigned blockState:4; /* One of the above block states. NB use unsigned because enum is sometimes an int */ |
| 81 | 283 __u32 needsRetiring:1; /* Data has failed on this block, need to get valid data off */ |
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284 /* and retire the block. */ |
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285 __u32 skipErasedCheck:1; /* If this is set we can skip the erased check on this block */ |
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286 __u32 gcPrioritise:1; /* An ECC check or blank check has failed on this block. |
| 148 | 287 It should be prioritised for GC */ |
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288 __u32 chunkErrorStrikes:3; /* How many times we've had ecc etc failures on this block and tried to reuse it */ |
| 148 | 289 |
| 4 | 290 #ifdef CONFIG_YAFFS_YAFFS2 |
| 81 | 291 __u32 hasShrinkHeader:1; /* This block has at least one shrink object header */ |
| 292 __u32 sequenceNumber; /* block sequence number for yaffs2 */ | |
| 0 | 293 #endif |
| 294 | |
| 295 } yaffs_BlockInfo; | |
| 296 | |
| 81 | 297 /* -------------------------- Object structure -------------------------------*/ |
| 298 /* This is the object structure as stored on NAND */ | |
| 0 | 299 |
| 77 | 300 typedef struct { |
| 0 | 301 yaffs_ObjectType type; |
| 302 | |
| 81 | 303 /* Apply to everything */ |
| 77 | 304 int parentObjectId; |
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305 __u16 sum__NoLongerUsed; /* checksum of name. No longer used */ |
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306 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; |
| 0 | 307 |
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308 /* The following apply to directories, files, symlinks - not hard links */ |
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309 __u32 yst_mode; /* protection */ |
| 0 | 310 |
| 311 #ifdef CONFIG_YAFFS_WINCE | |
| 312 __u32 notForWinCE[5]; | |
| 313 #else | |
| 81 | 314 __u32 yst_uid; |
| 315 __u32 yst_gid; | |
| 316 __u32 yst_atime; | |
| 317 __u32 yst_mtime; | |
| 318 __u32 yst_ctime; | |
| 0 | 319 #endif |
| 320 | |
| 81 | 321 /* File size applies to files only */ |
| 77 | 322 int fileSize; |
| 323 | |
| 81 | 324 /* Equivalent object id applies to hard links only. */ |
| 77 | 325 int equivalentObjectId; |
| 326 | |
| 81 | 327 /* Alias is for symlinks only. */ |
| 0 | 328 YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1]; |
| 77 | 329 |
| 81 | 330 __u32 yst_rdev; /* device stuff for block and char devices (major/min) */ |
| 77 | 331 |
| 0 | 332 #ifdef CONFIG_YAFFS_WINCE |
| 333 __u32 win_ctime[2]; | |
| 334 __u32 win_atime[2]; | |
| 335 __u32 win_mtime[2]; | |
| 336 #else | |
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337 __u32 roomToGrow[6]; |
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338 |
| 0 | 339 #endif |
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340 __u32 inbandShadowsObject; |
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341 __u32 inbandIsShrink; |
| 0 | 342 |
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343 __u32 reservedSpace[2]; |
| 81 | 344 int shadowsObject; /* This object header shadows the specified object if > 0 */ |
| 48 | 345 |
| 81 | 346 /* isShrink applies to object headers written when we shrink the file (ie resize) */ |
| 0 | 347 __u32 isShrink; |
| 77 | 348 |
| 0 | 349 } yaffs_ObjectHeader; |
| 350 | |
| 81 | 351 /*--------------------------- Tnode -------------------------- */ |
| 0 | 352 |
| 77 | 353 union yaffs_Tnode_union { |
| 0 | 354 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG |
| 77 | 355 union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL + 1]; |
| 0 | 356 #else |
| 357 union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL]; | |
| 358 #endif | |
| 105 | 359 /* __u16 level0[YAFFS_NTNODES_LEVEL0]; */ |
| 77 | 360 |
| 0 | 361 }; |
| 362 | |
| 363 typedef union yaffs_Tnode_union yaffs_Tnode; | |
| 364 | |
| 77 | 365 struct yaffs_TnodeList_struct { |
| 0 | 366 struct yaffs_TnodeList_struct *next; |
| 367 yaffs_Tnode *tnodes; | |
| 368 }; | |
| 369 | |
| 370 typedef struct yaffs_TnodeList_struct yaffs_TnodeList; | |
| 371 | |
| 81 | 372 /*------------------------ Object -----------------------------*/ |
| 373 /* An object can be one of: | |
| 374 * - a directory (no data, has children links | |
| 375 * - a regular file (data.... not prunes :->). | |
| 376 * - a symlink [symbolic link] (the alias). | |
| 377 * - a hard link | |
| 378 */ | |
| 0 | 379 |
| 77 | 380 typedef struct { |
| 0 | 381 __u32 fileSize; |
| 382 __u32 scannedFileSize; | |
| 15 | 383 __u32 shrinkSize; |
| 77 | 384 int topLevel; |
| 0 | 385 yaffs_Tnode *top; |
| 386 } yaffs_FileStructure; | |
| 387 | |
| 77 | 388 typedef struct { |
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389 struct ylist_head children; /* list of child links */ |
| 0 | 390 } yaffs_DirectoryStructure; |
| 391 | |
| 77 | 392 typedef struct { |
| 0 | 393 YCHAR *alias; |
| 394 } yaffs_SymLinkStructure; | |
| 395 | |
| 77 | 396 typedef struct { |
| 0 | 397 struct yaffs_ObjectStruct *equivalentObject; |
| 77 | 398 __u32 equivalentObjectId; |
| 0 | 399 } yaffs_HardLinkStructure; |
| 400 | |
| 77 | 401 typedef union { |
| 0 | 402 yaffs_FileStructure fileVariant; |
| 403 yaffs_DirectoryStructure directoryVariant; | |
| 404 yaffs_SymLinkStructure symLinkVariant; | |
| 405 yaffs_HardLinkStructure hardLinkVariant; | |
| 406 } yaffs_ObjectVariant; | |
| 407 | |
| 344 | 408 |
| 409 | |
| 77 | 410 struct yaffs_ObjectStruct { |
| 81 | 411 __u8 deleted:1; /* This should only apply to unlinked files. */ |
| 412 __u8 softDeleted:1; /* it has also been soft deleted */ | |
| 413 __u8 unlinked:1; /* An unlinked file. The file should be in the unlinked directory.*/ | |
| 414 __u8 fake:1; /* A fake object has no presence on NAND. */ | |
| 415 __u8 renameAllowed:1; /* Some objects are not allowed to be renamed. */ | |
| 77 | 416 __u8 unlinkAllowed:1; |
| 81 | 417 __u8 dirty:1; /* the object needs to be written to flash */ |
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418 __u8 valid:1; /* When the file system is being loaded up, this |
| 81 | 419 * object might be created before the data |
| 420 * is available (ie. file data records appear before the header). | |
| 421 */ | |
| 124 | 422 __u8 lazyLoaded:1; /* This object has been lazy loaded and is missing some detail */ |
| 0 | 423 |
| 81 | 424 __u8 deferedFree:1; /* For Linux kernel. Object is removed from NAND, but is |
| 425 * still in the inode cache. Free of object is defered. | |
| 426 * until the inode is released. | |
|
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427 */ |
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428 __u8 beingCreated:1; /* This object is still being created so skip some checks. */ |
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429 __u8 isShadowed:1; /* This object is shadowed on the way to being renamed. */ |
| 4 | 430 |
| 270 | 431 __u8 serial; /* serial number of chunk in NAND. Cached here */ |
| 432 __u16 sum; /* sum of the name to speed searching */ | |
| 81 | 433 |
|
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434 struct yaffs_DeviceStruct *myDev; /* The device I'm on */ |
| 77 | 435 |
|
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436 struct ylist_head hashLink; /* list of objects in this hash bucket */ |
| 4 | 437 |
|
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438 struct ylist_head hardLinks; /* all the equivalent hard linked objects */ |
| 0 | 439 |
|
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440 /* directory structure stuff */ |
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441 /* also used for linking up the free list */ |
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442 struct yaffs_ObjectStruct *parent; |
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443 struct ylist_head siblings; |
| 77 | 444 |
|
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445 /* Where's my object header in NAND? */ |
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446 int hdrChunk; |
| 0 | 447 |
| 81 | 448 int nDataChunks; /* Number of data chunks attached to the file. */ |
| 77 | 449 |
| 81 | 450 __u32 objectId; /* the object id value */ |
| 77 | 451 |
| 270 | 452 __u32 yst_mode; |
| 0 | 453 |
| 454 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM | |
| 270 | 455 YCHAR shortName[YAFFS_SHORT_NAME_LENGTH + 1]; |
| 0 | 456 #endif |
| 457 | |
| 458 #ifndef __KERNEL__ | |
| 459 __u32 inUse; | |
| 460 #endif | |
| 461 | |
| 462 #ifdef CONFIG_YAFFS_WINCE | |
| 463 __u32 win_ctime[2]; | |
| 464 __u32 win_mtime[2]; | |
| 465 __u32 win_atime[2]; | |
| 466 #else | |
| 81 | 467 __u32 yst_uid; |
| 468 __u32 yst_gid; | |
| 469 __u32 yst_atime; | |
| 470 __u32 yst_mtime; | |
| 471 __u32 yst_ctime; | |
| 0 | 472 #endif |
| 473 | |
| 81 | 474 __u32 yst_rdev; |
| 0 | 475 |
| 476 #ifdef __KERNEL__ | |
| 477 struct inode *myInode; | |
| 4 | 478 |
| 0 | 479 #endif |
| 480 | |
| 77 | 481 yaffs_ObjectType variantType; |
| 0 | 482 |
| 483 yaffs_ObjectVariant variant; | |
| 77 | 484 |
| 0 | 485 }; |
| 486 | |
| 487 typedef struct yaffs_ObjectStruct yaffs_Object; | |
| 488 | |
| 77 | 489 struct yaffs_ObjectList_struct { |
| 0 | 490 yaffs_Object *objects; |
| 491 struct yaffs_ObjectList_struct *next; | |
| 492 }; | |
| 493 | |
| 494 typedef struct yaffs_ObjectList_struct yaffs_ObjectList; | |
| 495 | |
| 77 | 496 typedef struct { |
|
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497 struct ylist_head list; |
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498 int count; |
| 0 | 499 } yaffs_ObjectBucket; |
| 500 | |
| 131 | 501 |
|
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502 /* yaffs_CheckpointObject holds the definition of an object as dumped |
| 131 | 503 * by checkpointing. |
| 504 */ | |
| 505 | |
| 506 typedef struct { | |
|
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507 int structType; |
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508 __u32 objectId; |
| 131 | 509 __u32 parentId; |
|
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510 int hdrChunk; |
| 131 | 511 yaffs_ObjectType variantType:3; |
|
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512 __u8 deleted:1; |
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513 __u8 softDeleted:1; |
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514 __u8 unlinked:1; |
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515 __u8 fake:1; |
| 131 | 516 __u8 renameAllowed:1; |
| 517 __u8 unlinkAllowed:1; | |
|
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518 __u8 serial; |
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519 |
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520 int nDataChunks; |
| 131 | 521 __u32 fileSizeOrEquivalentObjectId; |
|
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522 } yaffs_CheckpointObject; |
| 131 | 523 |
| 81 | 524 /*--------------------- Temporary buffers ---------------- |
| 525 * | |
| 526 * These are chunk-sized working buffers. Each device has a few | |
| 527 */ | |
| 0 | 528 |
| 529 typedef struct { | |
| 530 __u8 *buffer; | |
| 81 | 531 int line; /* track from whence this buffer was allocated */ |
| 0 | 532 int maxLine; |
| 533 } yaffs_TempBuffer; | |
| 534 | |
| 81 | 535 /*----------------- Device ---------------------------------*/ |
| 0 | 536 |
| 344 | 537 |
| 77 | 538 struct yaffs_DeviceStruct { |
|
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539 struct ylist_head devList; |
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540 const char *name; |
| 29 | 541 |
|
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542 /* Entry parameters set up way early. Yaffs sets up the rest.*/ |
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543 int nDataBytesPerChunk; /* Should be a power of 2 >= 512 */ |
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544 int nChunksPerBlock; /* does not need to be a power of 2 */ |
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545 int spareBytesPerChunk; /* spare area size */ |
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546 int startBlock; /* Start block we're allowed to use */ |
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547 int endBlock; /* End block we're allowed to use */ |
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548 int nReservedBlocks; /* We want this tuneable so that we can reduce */ |
| 81 | 549 /* reserved blocks on NOR and RAM. */ |
|
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550 |
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551 |
| 134 | 552 /* Stuff used by the shared space checkpointing mechanism */ |
| 553 /* If this value is zero, then this mechanism is disabled */ | |
| 131 | 554 |
|
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555 /* int nCheckpointReservedBlocks; */ /* Blocks to reserve for checkpoint data */ |
| 131 | 556 |
| 0 | 557 |
| 81 | 558 int nShortOpCaches; /* If <= 0, then short op caching is disabled, else |
| 559 * the number of short op caches (don't use too many) | |
| 560 */ | |
| 77 | 561 |
| 81 | 562 int useHeaderFileSize; /* Flag to determine if we should use file sizes from the header */ |
| 77 | 563 |
| 323 | 564 int useNANDECC; /* Flag to decide whether or not to use NANDECC on data (yaffs1) */ |
| 565 int noTagsECC; /* Flag to decide whether or not to do ECC on packed tags (yaffs2) */ | |
|
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566 |
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567 int disableLazyLoad; /* Disable lazy loading on this device */ |
| 77 | 568 |
| 81 | 569 void *genericDevice; /* Pointer to device context |
| 570 * On an mtd this holds the mtd pointer. | |
| 571 */ | |
|
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572 void *superBlock; |
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573 |
| 81 | 574 /* NAND access functions (Must be set before calling YAFFS)*/ |
| 4 | 575 |
|
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576 int (*writeChunkToNAND) (struct yaffs_DeviceStruct *dev, |
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577 int chunkInNAND, const __u8 *data, |
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578 const yaffs_Spare *spare); |
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579 int (*readChunkFromNAND) (struct yaffs_DeviceStruct *dev, |
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580 int chunkInNAND, __u8 *data, |
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581 yaffs_Spare *spare); |
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582 int (*eraseBlockInNAND) (struct yaffs_DeviceStruct *dev, |
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583 int blockInNAND); |
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584 int (*initialiseNAND) (struct yaffs_DeviceStruct *dev); |
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585 int (*deinitialiseNAND) (struct yaffs_DeviceStruct *dev); |
| 4 | 586 |
| 587 #ifdef CONFIG_YAFFS_YAFFS2 | |
|
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588 int (*writeChunkWithTagsToNAND) (struct yaffs_DeviceStruct *dev, |
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589 int chunkInNAND, const __u8 *data, |
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590 const yaffs_ExtendedTags *tags); |
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591 int (*readChunkWithTagsFromNAND) (struct yaffs_DeviceStruct *dev, |
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592 int chunkInNAND, __u8 *data, |
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593 yaffs_ExtendedTags *tags); |
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594 int (*markNANDBlockBad) (struct yaffs_DeviceStruct *dev, int blockNo); |
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595 int (*queryNANDBlock) (struct yaffs_DeviceStruct *dev, int blockNo, |
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596 yaffs_BlockState *state, __u32 *sequenceNumber); |
| 0 | 597 #endif |
| 598 | |
| 599 int isYaffs2; | |
|
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600 |
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601 /* The removeObjectCallback function must be supplied by OS flavours that |
| 84 | 602 * need it. The Linux kernel does not use this, but yaffs direct does use |
| 603 * it to implement the faster readdir | |
| 604 */ | |
| 605 void (*removeObjectCallback)(struct yaffs_ObjectStruct *obj); | |
|
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606 |
| 134 | 607 /* Callback to mark the superblock dirsty */ |
|
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608 void (*markSuperBlockDirty)(void *superblock); |
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609 |
| 105 | 610 int wideTnodesDisabled; /* Set to disable wide tnodes */ |
|
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611 |
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612 YCHAR *pathDividers; /* String of legal path dividers */ |
|
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613 |
| 0 | 614 |
| 81 | 615 /* End of stuff that must be set before initialisation. */ |
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616 |
| 182 | 617 /* Checkpoint control. Can be set before or after initialisation */ |
| 618 __u8 skipCheckpointRead; | |
| 619 __u8 skipCheckpointWrite; | |
| 77 | 620 |
| 81 | 621 /* Runtime parameters. Set up by YAFFS. */ |
| 77 | 622 |
| 81 | 623 __u16 chunkGroupBits; /* 0 for devices <= 32MB. else log2(nchunks) - 16 */ |
| 624 __u16 chunkGroupSize; /* == 2^^chunkGroupBits */ | |
|
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625 |
| 105 | 626 /* Stuff to support wide tnodes */ |
| 627 __u32 tnodeWidth; | |
| 628 __u32 tnodeMask; | |
|
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629 |
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630 /* Stuff for figuring out file offset to chunk conversions */ |
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631 __u32 chunkShift; /* Shift value */ |
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632 __u32 chunkDiv; /* Divisor after shifting: 1 for power-of-2 sizes */ |
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633 __u32 chunkMask; /* Mask to use for power-of-2 case */ |
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634 |
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635 /* Stuff to handle inband tags */ |
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636 int inbandTags; |
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637 __u32 totalBytesPerChunk; |
| 77 | 638 |
| 0 | 639 #ifdef __KERNEL__ |
| 640 | |
| 81 | 641 struct semaphore sem; /* Semaphore for waiting on erasure.*/ |
| 642 struct semaphore grossLock; /* Gross locking semaphore */ | |
| 352 | 643 struct rw_semaphore dirLock; /* Lock the directory structure */ |
|
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644 __u8 *spareBuffer; /* For mtdif2 use. Don't know the size of the buffer |
| 81 | 645 * at compile time so we have to allocate it. |
| 646 */ | |
|
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647 void (*putSuperFunc) (struct super_block *sb); |
| 0 | 648 #endif |
| 649 | |
| 650 int isMounted; | |
|
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651 |
| 131 | 652 int isCheckpointed; |
| 77 | 653 |
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654 |
| 81 | 655 /* Stuff to support block offsetting to support start block zero */ |
| 21 | 656 int internalStartBlock; |
| 657 int internalEndBlock; | |
| 658 int blockOffset; | |
| 659 int chunkOffset; | |
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660 |
| 77 | 661 |
| 131 | 662 /* Runtime checkpointing stuff */ |
| 134 | 663 int checkpointPageSequence; /* running sequence number of checkpoint pages */ |
| 131 | 664 int checkpointByteCount; |
| 665 int checkpointByteOffset; | |
| 666 __u8 *checkpointBuffer; | |
| 667 int checkpointOpenForWrite; | |
| 134 | 668 int blocksInCheckpoint; |
| 669 int checkpointCurrentChunk; | |
| 670 int checkpointCurrentBlock; | |
| 671 int checkpointNextBlock; | |
| 672 int *checkpointBlockList; | |
| 673 int checkpointMaxBlocks; | |
| 182 | 674 __u32 checkpointSum; |
| 675 __u32 checkpointXor; | |
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676 |
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677 int nCheckpointBlocksRequired; /* Number of blocks needed to store current checkpoint set */ |
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678 |
| 81 | 679 /* Block Info */ |
| 0 | 680 yaffs_BlockInfo *blockInfo; |
| 81 | 681 __u8 *chunkBits; /* bitmap of chunks in use */ |
| 95 | 682 unsigned blockInfoAlt:1; /* was allocated using alternative strategy */ |
| 683 unsigned chunkBitsAlt:1; /* was allocated using alternative strategy */ | |
|
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684 int chunkBitmapStride; /* Number of bytes of chunkBits per block. |
| 81 | 685 * Must be consistent with nChunksPerBlock. |
| 686 */ | |
| 0 | 687 |
| 77 | 688 int nErasedBlocks; |
| 81 | 689 int allocationBlock; /* Current block being allocated off */ |
| 0 | 690 __u32 allocationPage; |
| 81 | 691 int allocationBlockFinder; /* Used to search for next allocation block */ |
| 77 | 692 |
| 81 | 693 /* Runtime state */ |
| 77 | 694 int nTnodesCreated; |
| 0 | 695 yaffs_Tnode *freeTnodes; |
| 77 | 696 int nFreeTnodes; |
| 0 | 697 yaffs_TnodeList *allocatedTnodeList; |
| 698 | |
| 77 | 699 int isDoingGC; |
| 246 | 700 int gcBlock; |
| 701 int gcChunk; | |
| 0 | 702 |
| 77 | 703 int nObjectsCreated; |
| 0 | 704 yaffs_Object *freeObjects; |
| 77 | 705 int nFreeObjects; |
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706 |
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707 int nHardLinks; |
| 0 | 708 |
| 709 yaffs_ObjectList *allocatedObjectList; | |
| 710 | |
| 711 yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS]; | |
| 712 | |
| 77 | 713 int nFreeChunks; |
| 714 | |
| 81 | 715 int currentDirtyChecker; /* Used to find current dirtiest block */ |
| 77 | 716 |
| 81 | 717 __u32 *gcCleanupList; /* objects to delete at the end of a GC. */ |
| 185 | 718 int nonAggressiveSkip; /* GC state/mode */ |
| 77 | 719 |
| 81 | 720 /* Statistcs */ |
| 0 | 721 int nPageWrites; |
| 722 int nPageReads; | |
| 723 int nBlockErasures; | |
| 724 int nErasureFailures; | |
| 725 int nGCCopies; | |
| 726 int garbageCollections; | |
| 727 int passiveGarbageCollections; | |
| 728 int nRetriedWrites; | |
| 729 int nRetiredBlocks; | |
| 730 int eccFixed; | |
| 731 int eccUnfixed; | |
| 732 int tagsEccFixed; | |
| 733 int tagsEccUnfixed; | |
| 734 int nDeletions; | |
| 735 int nUnmarkedDeletions; | |
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736 |
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737 int hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */ |
| 77 | 738 |
| 81 | 739 /* Special directories */ |
| 0 | 740 yaffs_Object *rootDir; |
| 741 yaffs_Object *lostNFoundDir; | |
| 77 | 742 |
| 81 | 743 /* Buffer areas for storing data to recover from write failures TODO |
| 744 * __u8 bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK]; | |
| 745 * yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK]; | |
| 746 */ | |
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747 |
| 81 | 748 int bufferedBlock; /* Which block is buffered here? */ |
| 0 | 749 int doingBufferedBlockRewrite; |
| 750 | |
| 751 yaffs_ChunkCache *srCache; | |
| 752 int srLastUse; | |
| 753 | |
| 754 int cacheHits; | |
| 755 | |
| 81 | 756 /* Stuff for background deletion and unlinked files.*/ |
| 757 yaffs_Object *unlinkedDir; /* Directory where unlinked and deleted files live. */ | |
| 758 yaffs_Object *deletedDir; /* Directory where deleted objects are sent to disappear. */ | |
| 759 yaffs_Object *unlinkedDeletion; /* Current file being background deleted.*/ | |
| 760 int nDeletedFiles; /* Count of files awaiting deletion;*/ | |
| 761 int nUnlinkedFiles; /* Count of unlinked files. */ | |
| 762 int nBackgroundDeletions; /* Count of background deletions. */ | |
| 77 | 763 |
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764 |
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765 /* Temporary buffer management */ |
| 0 | 766 yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS]; |
| 767 int maxTemp; | |
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768 int tempInUse; |
| 0 | 769 int unmanagedTempAllocations; |
| 770 int unmanagedTempDeallocations; | |
| 77 | 771 |
| 81 | 772 /* yaffs2 runtime stuff */ |
| 773 unsigned sequenceNumber; /* Sequence number of currently allocating block */ | |
| 0 | 774 unsigned oldestDirtySequence; |
| 344 | 775 |
| 776 /* Auto empty lost and found directory on mount */ | |
| 777 int emptyLostAndFound; | |
| 0 | 778 }; |
| 779 | |
| 780 typedef struct yaffs_DeviceStruct yaffs_Device; | |
| 781 | |
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782 /* The static layout of block usage etc is stored in the super block header */ |
| 131 | 783 typedef struct { |
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784 int StructType; |
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785 int version; |
| 131 | 786 int checkpointStartBlock; |
| 787 int checkpointEndBlock; | |
| 788 int startBlock; | |
| 789 int endBlock; | |
| 790 int rfu[100]; | |
| 791 } yaffs_SuperBlockHeader; | |
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792 |
| 131 | 793 /* The CheckpointDevice structure holds the device information that changes at runtime and |
| 794 * must be preserved over unmount/mount cycles. | |
| 795 */ | |
| 796 typedef struct { | |
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797 int structType; |
| 131 | 798 int nErasedBlocks; |
| 799 int allocationBlock; /* Current block being allocated off */ | |
| 800 __u32 allocationPage; | |
| 801 int nFreeChunks; | |
| 802 | |
| 803 int nDeletedFiles; /* Count of files awaiting deletion;*/ | |
| 804 int nUnlinkedFiles; /* Count of unlinked files. */ | |
| 805 int nBackgroundDeletions; /* Count of background deletions. */ | |
| 806 | |
| 807 /* yaffs2 runtime stuff */ | |
| 808 unsigned sequenceNumber; /* Sequence number of currently allocating block */ | |
| 809 unsigned oldestDirtySequence; | |
| 810 | |
| 811 } yaffs_CheckpointDevice; | |
| 812 | |
| 813 | |
| 814 typedef struct { | |
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815 int structType; |
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816 __u32 magic; |
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817 __u32 version; |
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818 __u32 head; |
| 131 | 819 } yaffs_CheckpointValidity; |
| 820 | |
| 0 | 821 |
| 81 | 822 /*----------------------- YAFFS Functions -----------------------*/ |
| 0 | 823 |
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824 int yaffs_GutsInitialise(yaffs_Device *dev); |
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825 void yaffs_Deinitialise(yaffs_Device *dev); |
| 0 | 826 |
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827 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev); |
| 0 | 828 |
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829 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName, |
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830 yaffs_Object *newDir, const YCHAR *newName); |
| 0 | 831 |
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832 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name); |
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833 int yaffs_DeleteObject(yaffs_Object *obj); |
| 0 | 834 |
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835 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize); |
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836 int yaffs_GetObjectFileLength(yaffs_Object *obj); |
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837 int yaffs_GetObjectInode(yaffs_Object *obj); |
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838 unsigned yaffs_GetObjectType(yaffs_Object *obj); |
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839 int yaffs_GetObjectLinkCount(yaffs_Object *obj); |
| 0 | 840 |
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841 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr); |
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842 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr); |
| 0 | 843 |
| 81 | 844 /* File operations */ |
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845 int yaffs_ReadDataFromFile(yaffs_Object *obj, __u8 *buffer, loff_t offset, |
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846 int nBytes); |
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847 int yaffs_WriteDataToFile(yaffs_Object *obj, const __u8 *buffer, loff_t offset, |
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848 int nBytes, int writeThrough); |
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849 int yaffs_ResizeFile(yaffs_Object *obj, loff_t newSize); |
| 0 | 850 |
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851 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name, |
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852 __u32 mode, __u32 uid, __u32 gid); |
| 308 | 853 |
| 854 int yaffs_FlushFile(yaffs_Object *obj, int updateTime, int dataSync); | |
| 0 | 855 |
| 131 | 856 /* Flushing and checkpointing */ |
| 857 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev); | |
| 858 | |
| 859 int yaffs_CheckpointSave(yaffs_Device *dev); | |
| 860 int yaffs_CheckpointRestore(yaffs_Device *dev); | |
| 861 | |
| 81 | 862 /* Directory operations */ |
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863 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name, |
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864 __u32 mode, __u32 uid, __u32 gid); |
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865 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *theDir, const YCHAR *name); |
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866 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir, |
| 77 | 867 int (*fn) (yaffs_Object *)); |
| 0 | 868 |
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869 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number); |
| 0 | 870 |
| 81 | 871 /* Link operations */ |
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872 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name, |
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873 yaffs_Object *equivalentObject); |
| 0 | 874 |
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875 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj); |
| 0 | 876 |
| 81 | 877 /* Symlink operations */ |
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878 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name, |
| 77 | 879 __u32 mode, __u32 uid, __u32 gid, |
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880 const YCHAR *alias); |
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881 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj); |
| 0 | 882 |
| 81 | 883 /* Special inodes (fifos, sockets and devices) */ |
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884 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name, |
| 77 | 885 __u32 mode, __u32 uid, __u32 gid, __u32 rdev); |
| 0 | 886 |
| 81 | 887 /* Special directories */ |
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888 yaffs_Object *yaffs_Root(yaffs_Device *dev); |
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889 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev); |
| 0 | 890 |
| 891 #ifdef CONFIG_YAFFS_WINCE | |
| 81 | 892 /* CONFIG_YAFFS_WINCE special stuff */ |
| 77 | 893 void yfsd_WinFileTimeNow(__u32 target[2]); |
| 0 | 894 #endif |
| 895 | |
| 4 | 896 #ifdef __KERNEL__ |
| 897 | |
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898 void yaffs_HandleDeferedFree(yaffs_Object *obj); |
| 4 | 899 #endif |
| 900 | |
| 81 | 901 /* Debug dump */ |
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902 int yaffs_DumpObject(yaffs_Object *obj); |
| 0 | 903 |
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904 void yaffs_GutsTest(yaffs_Device *dev); |
| 0 | 905 |
| 84 | 906 /* A few useful functions */ |
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907 void yaffs_InitialiseTags(yaffs_ExtendedTags *tags); |
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908 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn); |
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909 int yaffs_CheckFF(__u8 *buffer, int nBytes); |
| 153 | 910 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi); |
| 0 | 911 |
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912 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo); |
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913 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo); |
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914 |
| 0 | 915 #endif |