2 * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
4 * Copyright (C) 2002-2007 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
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.
13 * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
16 #ifndef __YAFFS_GUTS_H__
17 #define __YAFFS_GUTS_H__
19 #include "devextras.h"
29 * And what have we got...
31 #define YAFFS_MAGIC 0x5941FF53
33 #define YAFFS_NTNODES_LEVEL0 16
34 #define YAFFS_TNODES_LEVEL0_BITS 4
35 #define YAFFS_TNODES_LEVEL0_MASK 0xf
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
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)
50 #define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024
51 #define YAFFS_MIN_YAFFS2_SPARE_SIZE 32
53 #define YAFFS_MAX_CHUNK_ID 0x000FFFFF
55 #define YAFFS_UNUSED_OBJECT_ID 0x0003FFFF
57 #define YAFFS_ALLOCATION_NOBJECTS 100
58 #define YAFFS_ALLOCATION_NTNODES 100
59 #define YAFFS_ALLOCATION_NLINKS 100
61 #define YAFFS_NOBJECT_BUCKETS 256
64 #define YAFFS_OBJECT_SPACE 0x40000
66 #define YAFFS_NCHECKPOINT_OBJECTS 5000
68 #define YAFFS_CHECKPOINT_VERSION 2
70 #ifdef CONFIG_YAFFS_UNICODE
71 #define YAFFS_MAX_NAME_LENGTH 127
72 #define YAFFS_MAX_ALIAS_LENGTH 79
74 #define YAFFS_MAX_NAME_LENGTH 255
75 #define YAFFS_MAX_ALIAS_LENGTH 159
78 #define YAFFS_SHORT_NAME_LENGTH 15
80 /* Some special object ids for pseudo objects */
81 #define YAFFS_OBJECTID_ROOT 1
82 #define YAFFS_OBJECTID_LOSTNFOUND 2
83 #define YAFFS_OBJECTID_UNLINKED 3
84 #define YAFFS_OBJECTID_DELETED 4
86 /* Sseudo object ids for checkpointing */
87 #define YAFFS_OBJECTID_SB_HEADER 0x10
88 #define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20
89 #define YAFFS_SEQUENCE_CHECKPOINT_DATA 0x21
93 #define YAFFS_MAX_SHORT_OP_CACHES 20
95 #define YAFFS_N_TEMP_BUFFERS 4
97 /* Sequence numbers are used in YAFFS2 to determine block allocation order.
98 * The range is limited slightly to help distinguish bad numbers from good.
99 * This also allows us to perhaps in the future use special numbers for
101 * EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years,
102 * and is a larger number than the lifetime of a 2GB device.
104 #define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000
105 #define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xEFFFFF00
107 /* ChunkCache is used for short read/write operations.*/
109 struct yaffs_ObjectStruct *object;
113 int nBytes; /* Only valid if the cache is dirty */
114 int locked; /* Can't push out or flush while locked. */
115 #ifdef CONFIG_YAFFS_YAFFS2
118 __u8 data[YAFFS_BYTES_PER_CHUNK];
124 /* Tags structures in RAM
125 * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
126 * the structure size will get blown out.
129 #ifndef CONFIG_YAFFS_NO_YAFFS1
132 unsigned serialNumber:2;
133 unsigned byteCount:10;
134 unsigned objectId:18;
136 unsigned unusedStuff:2;
147 /* Stuff used for extended tags in YAFFS2 */
150 YAFFS_ECC_RESULT_UNKNOWN,
151 YAFFS_ECC_RESULT_NO_ERROR,
152 YAFFS_ECC_RESULT_FIXED,
153 YAFFS_ECC_RESULT_UNFIXED
157 YAFFS_OBJECT_TYPE_UNKNOWN,
158 YAFFS_OBJECT_TYPE_FILE,
159 YAFFS_OBJECT_TYPE_SYMLINK,
160 YAFFS_OBJECT_TYPE_DIRECTORY,
161 YAFFS_OBJECT_TYPE_HARDLINK,
162 YAFFS_OBJECT_TYPE_SPECIAL
167 unsigned validMarker0;
168 unsigned chunkUsed; /* Status of the chunk: used or unused */
169 unsigned objectId; /* If 0 then this is not part of an object (unused) */
170 unsigned chunkId; /* If 0 then this is a header, else a data chunk */
171 unsigned byteCount; /* Only valid for data chunks */
173 /* The following stuff only has meaning when we read */
174 yaffs_ECCResult eccResult;
178 unsigned chunkDeleted; /* The chunk is marked deleted */
179 unsigned serialNumber; /* Yaffs1 2-bit serial number */
182 unsigned sequenceNumber; /* The sequence number of this block */
184 /* Extra info if this is an object header (YAFFS2 only) */
186 unsigned extraHeaderInfoAvailable; /* There is extra info available if this is not zero */
187 unsigned extraParentObjectId; /* The parent object */
188 unsigned extraIsShrinkHeader; /* Is it a shrink header? */
189 unsigned extraShadows; /* Does this shadow another object? */
191 yaffs_ObjectType extraObjectType; /* What object type? */
193 unsigned extraFileLength; /* Length if it is a file */
194 unsigned extraEquivalentObjectId; /* Equivalent object Id if it is a hard link */
196 unsigned validMarker1;
198 } yaffs_ExtendedTags;
200 /* Spare structure for YAFFS1 */
206 __u8 pageStatus; /* set to 0 to delete the chunk */
216 /*Special structure for passing through to mtd */
217 struct yaffs_NANDSpare {
223 /* Block data in RAM */
226 YAFFS_BLOCK_STATE_UNKNOWN = 0,
228 YAFFS_BLOCK_STATE_SCANNING,
229 YAFFS_BLOCK_STATE_NEEDS_SCANNING,
230 /* The block might have something on it (ie it is allocating or full, perhaps empty)
231 * but it needs to be scanned to determine its true state.
232 * This state is only valid during yaffs_Scan.
233 * NB We tolerate empty because the pre-scanner might be incapable of deciding
234 * However, if this state is returned on a YAFFS2 device, then we expect a sequence number
237 YAFFS_BLOCK_STATE_EMPTY,
238 /* This block is empty */
240 YAFFS_BLOCK_STATE_ALLOCATING,
241 /* This block is partially allocated.
242 * At least one page holds valid data.
243 * This is the one currently being used for page
244 * allocation. Should never be more than one of these
247 YAFFS_BLOCK_STATE_FULL,
248 /* All the pages in this block have been allocated.
251 YAFFS_BLOCK_STATE_DIRTY,
252 /* All pages have been allocated and deleted.
253 * Erase me, reuse me.
256 YAFFS_BLOCK_STATE_CHECKPOINT,
257 /* This block is assigned to holding checkpoint data.
260 YAFFS_BLOCK_STATE_COLLECTING,
261 /* This block is being garbage collected */
263 YAFFS_BLOCK_STATE_DEAD
264 /* This block has failed and is not in use */
269 int softDeletions:10; /* number of soft deleted pages */
270 int pagesInUse:10; /* number of pages in use */
271 yaffs_BlockState blockState:4; /* One of the above block states */
272 __u32 needsRetiring:1; /* Data has failed on this block, need to get valid data off */
273 /* and retire the block. */
274 __u32 skipErasedCheck: 1; /* If this is set we can skip the erased check on this block */
275 __u32 gcPrioritise: 1; /* An ECC check or bank check has failed on this block.
276 It should be prioritised for GC */
277 __u32 chunkErrorStrikes:3; /* How many times we've had ecc etc failures on this block and tried to reuse it */
279 #ifdef CONFIG_YAFFS_YAFFS2
280 __u32 hasShrinkHeader:1; /* This block has at least one shrink object header */
281 __u32 sequenceNumber; /* block sequence number for yaffs2 */
286 /* -------------------------- Object structure -------------------------------*/
287 /* This is the object structure as stored on NAND */
290 yaffs_ObjectType type;
292 /* Apply to everything */
294 __u16 sum__NoLongerUsed; /* checksum of name. No longer used */
295 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
297 /* Thes following apply to directories, files, symlinks - not hard links */
298 __u32 yst_mode; /* protection */
300 #ifdef CONFIG_YAFFS_WINCE
301 __u32 notForWinCE[5];
310 /* File size applies to files only */
313 /* Equivalent object id applies to hard links only. */
314 int equivalentObjectId;
316 /* Alias is for symlinks only. */
317 YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
319 __u32 yst_rdev; /* device stuff for block and char devices (major/min) */
321 #ifdef CONFIG_YAFFS_WINCE
327 __u32 roomToGrow[10];
330 int shadowsObject; /* This object header shadows the specified object if > 0 */
332 /* isShrink applies to object headers written when we shrink the file (ie resize) */
335 } yaffs_ObjectHeader;
337 /*--------------------------- Tnode -------------------------- */
339 union yaffs_Tnode_union {
340 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
341 union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL + 1];
343 union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL];
345 /* __u16 level0[YAFFS_NTNODES_LEVEL0]; */
349 typedef union yaffs_Tnode_union yaffs_Tnode;
351 struct yaffs_TnodeList_struct {
352 struct yaffs_TnodeList_struct *next;
356 typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
358 /*------------------------ Object -----------------------------*/
359 /* An object can be one of:
360 * - a directory (no data, has children links
361 * - a regular file (data.... not prunes :->).
362 * - a symlink [symbolic link] (the alias).
368 __u32 scannedFileSize;
372 } yaffs_FileStructure;
375 struct list_head children; /* list of child links */
376 } yaffs_DirectoryStructure;
380 } yaffs_SymLinkStructure;
383 struct yaffs_ObjectStruct *equivalentObject;
384 __u32 equivalentObjectId;
385 } yaffs_HardLinkStructure;
388 yaffs_FileStructure fileVariant;
389 yaffs_DirectoryStructure directoryVariant;
390 yaffs_SymLinkStructure symLinkVariant;
391 yaffs_HardLinkStructure hardLinkVariant;
392 } yaffs_ObjectVariant;
394 struct yaffs_ObjectStruct {
395 __u8 deleted:1; /* This should only apply to unlinked files. */
396 __u8 softDeleted:1; /* it has also been soft deleted */
397 __u8 unlinked:1; /* An unlinked file. The file should be in the unlinked directory.*/
398 __u8 fake:1; /* A fake object has no presence on NAND. */
399 __u8 renameAllowed:1; /* Some objects are not allowed to be renamed. */
400 __u8 unlinkAllowed:1;
401 __u8 dirty:1; /* the object needs to be written to flash */
402 __u8 valid:1; /* When the file system is being loaded up, this
403 * object might be created before the data
404 * is available (ie. file data records appear before the header).
406 __u8 lazyLoaded:1; /* This object has been lazy loaded and is missing some detail */
408 __u8 deferedFree:1; /* For Linux kernel. Object is removed from NAND, but is
409 * still in the inode cache. Free of object is defered.
410 * until the inode is released.
413 __u8 serial; /* serial number of chunk in NAND. Cached here */
414 __u16 sum; /* sum of the name to speed searching */
416 struct yaffs_DeviceStruct *myDev; /* The device I'm on */
418 struct list_head hashLink; /* list of objects in this hash bucket */
420 struct list_head hardLinks; /* all the equivalent hard linked objects */
422 /* directory structure stuff */
423 /* also used for linking up the free list */
424 struct yaffs_ObjectStruct *parent;
425 struct list_head siblings;
427 /* Where's my object header in NAND? */
430 int nDataChunks; /* Number of data chunks attached to the file. */
432 __u32 objectId; /* the object id value */
436 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
437 YCHAR shortName[YAFFS_SHORT_NAME_LENGTH + 1];
444 #ifdef CONFIG_YAFFS_WINCE
459 struct inode *myInode;
463 yaffs_ObjectType variantType;
465 yaffs_ObjectVariant variant;
469 typedef struct yaffs_ObjectStruct yaffs_Object;
471 struct yaffs_ObjectList_struct {
472 yaffs_Object *objects;
473 struct yaffs_ObjectList_struct *next;
476 typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
479 struct list_head list;
481 } yaffs_ObjectBucket;
484 /* yaffs_CheckpointObject holds the definition of an object as dumped
494 yaffs_ObjectType variantType:3;
499 __u8 renameAllowed:1;
500 __u8 unlinkAllowed:1;
504 __u32 fileSizeOrEquivalentObjectId;
506 }yaffs_CheckpointObject;
508 /*--------------------- Temporary buffers ----------------
510 * These are chunk-sized working buffers. Each device has a few
515 int line; /* track from whence this buffer was allocated */
519 /*----------------- Device ---------------------------------*/
521 struct yaffs_DeviceStruct {
522 struct list_head devList;
525 /* Entry parameters set up way early. Yaffs sets up the rest.*/
526 int nDataBytesPerChunk; /* Should be a power of 2 >= 512 */
527 int nChunksPerBlock; /* does not need to be a power of 2 */
528 int nBytesPerSpare; /* spare area size */
529 int startBlock; /* Start block we're allowed to use */
530 int endBlock; /* End block we're allowed to use */
531 int nReservedBlocks; /* We want this tuneable so that we can reduce */
532 /* reserved blocks on NOR and RAM. */
534 /* Stuff used by the partitioned checkpointing mechanism */
535 int checkpointStartBlock;
536 int checkpointEndBlock;
538 /* Stuff used by the shared space checkpointing mechanism */
539 /* If this value is zero, then this mechanism is disabled */
541 int nCheckpointReservedBlocks; /* Blocks to reserve for checkpoint data */
546 int nShortOpCaches; /* If <= 0, then short op caching is disabled, else
547 * the number of short op caches (don't use too many)
550 int useHeaderFileSize; /* Flag to determine if we should use file sizes from the header */
552 int useNANDECC; /* Flag to decide whether or not to use NANDECC */
554 void *genericDevice; /* Pointer to device context
555 * On an mtd this holds the mtd pointer.
559 /* NAND access functions (Must be set before calling YAFFS)*/
561 int (*writeChunkToNAND) (struct yaffs_DeviceStruct * dev,
562 int chunkInNAND, const __u8 * data,
563 const yaffs_Spare * spare);
564 int (*readChunkFromNAND) (struct yaffs_DeviceStruct * dev,
565 int chunkInNAND, __u8 * data,
566 yaffs_Spare * spare);
567 int (*eraseBlockInNAND) (struct yaffs_DeviceStruct * dev,
569 int (*initialiseNAND) (struct yaffs_DeviceStruct * dev);
571 #ifdef CONFIG_YAFFS_YAFFS2
572 int (*writeChunkWithTagsToNAND) (struct yaffs_DeviceStruct * dev,
573 int chunkInNAND, const __u8 * data,
574 const yaffs_ExtendedTags * tags);
575 int (*readChunkWithTagsFromNAND) (struct yaffs_DeviceStruct * dev,
576 int chunkInNAND, __u8 * data,
577 yaffs_ExtendedTags * tags);
578 int (*markNANDBlockBad) (struct yaffs_DeviceStruct * dev, int blockNo);
579 int (*queryNANDBlock) (struct yaffs_DeviceStruct * dev, int blockNo,
580 yaffs_BlockState * state, int *sequenceNumber);
585 /* The removeObjectCallback function must be supplied by OS flavours that
586 * need it. The Linux kernel does not use this, but yaffs direct does use
587 * it to implement the faster readdir
589 void (*removeObjectCallback)(struct yaffs_ObjectStruct *obj);
591 /* Callback to mark the superblock dirsty */
592 void (*markSuperBlockDirty)(void * superblock);
594 int wideTnodesDisabled; /* Set to disable wide tnodes */
597 /* End of stuff that must be set before initialisation. */
599 /* Runtime parameters. Set up by YAFFS. */
601 __u16 chunkGroupBits; /* 0 for devices <= 32MB. else log2(nchunks) - 16 */
602 __u16 chunkGroupSize; /* == 2^^chunkGroupBits */
604 /* Stuff to support wide tnodes */
608 /* Stuff to support various file offses to chunk/offset translations */
609 /* "Crumbs" for nDataBytesPerChunk not being a power of 2 */
612 __u32 crumbsPerChunk;
614 /* Straight shifting for nDataBytesPerChunk being a power of 2 */
621 struct semaphore sem; /* Semaphore for waiting on erasure.*/
622 struct semaphore grossLock; /* Gross locking semaphore */
623 __u8 *spareBuffer; /* For mtdif2 use. Don't know the size of the buffer
624 * at compile time so we have to allocate it.
626 void (*putSuperFunc) (struct super_block * sb);
634 /* Stuff to support block offsetting to support start block zero */
635 int internalStartBlock;
636 int internalEndBlock;
641 /* Runtime checkpointing stuff */
642 int checkpointPageSequence; /* running sequence number of checkpoint pages */
643 int checkpointByteCount;
644 int checkpointByteOffset;
645 __u8 *checkpointBuffer;
646 int checkpointOpenForWrite;
647 int blocksInCheckpoint;
648 int checkpointCurrentChunk;
649 int checkpointCurrentBlock;
650 int checkpointNextBlock;
651 int *checkpointBlockList;
652 int checkpointMaxBlocks;
655 yaffs_BlockInfo *blockInfo;
656 __u8 *chunkBits; /* bitmap of chunks in use */
657 unsigned blockInfoAlt:1; /* was allocated using alternative strategy */
658 unsigned chunkBitsAlt:1; /* was allocated using alternative strategy */
659 int chunkBitmapStride; /* Number of bytes of chunkBits per block.
660 * Must be consistent with nChunksPerBlock.
664 int allocationBlock; /* Current block being allocated off */
665 __u32 allocationPage;
666 int allocationBlockFinder; /* Used to search for next allocation block */
670 yaffs_Tnode *freeTnodes;
672 yaffs_TnodeList *allocatedTnodeList;
677 yaffs_Object *freeObjects;
680 yaffs_ObjectList *allocatedObjectList;
682 yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];
686 int currentDirtyChecker; /* Used to find current dirtiest block */
688 __u32 *gcCleanupList; /* objects to delete at the end of a GC. */
694 int nErasureFailures;
696 int garbageCollections;
697 int passiveGarbageCollections;
705 int nUnmarkedDeletions;
707 int hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */
709 /* Special directories */
710 yaffs_Object *rootDir;
711 yaffs_Object *lostNFoundDir;
713 /* Buffer areas for storing data to recover from write failures TODO
714 * __u8 bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
715 * yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK];
718 int bufferedBlock; /* Which block is buffered here? */
719 int doingBufferedBlockRewrite;
721 yaffs_ChunkCache *srCache;
726 /* Stuff for background deletion and unlinked files.*/
727 yaffs_Object *unlinkedDir; /* Directory where unlinked and deleted files live. */
728 yaffs_Object *deletedDir; /* Directory where deleted objects are sent to disappear. */
729 yaffs_Object *unlinkedDeletion; /* Current file being background deleted.*/
730 int nDeletedFiles; /* Count of files awaiting deletion;*/
731 int nUnlinkedFiles; /* Count of unlinked files. */
732 int nBackgroundDeletions; /* Count of background deletions. */
735 yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS];
737 int unmanagedTempAllocations;
738 int unmanagedTempDeallocations;
740 /* yaffs2 runtime stuff */
741 unsigned sequenceNumber; /* Sequence number of currently allocating block */
742 unsigned oldestDirtySequence;
746 typedef struct yaffs_DeviceStruct yaffs_Device;
748 /* The static layout of bllock usage etc is stored in the super block header */
752 int checkpointStartBlock;
753 int checkpointEndBlock;
757 } yaffs_SuperBlockHeader;
759 /* The CheckpointDevice structure holds the device information that changes at runtime and
760 * must be preserved over unmount/mount cycles.
765 int allocationBlock; /* Current block being allocated off */
766 __u32 allocationPage;
769 int nDeletedFiles; /* Count of files awaiting deletion;*/
770 int nUnlinkedFiles; /* Count of unlinked files. */
771 int nBackgroundDeletions; /* Count of background deletions. */
773 /* yaffs2 runtime stuff */
774 unsigned sequenceNumber; /* Sequence number of currently allocating block */
775 unsigned oldestDirtySequence;
777 } yaffs_CheckpointDevice;
785 } yaffs_CheckpointValidity;
787 /* Function to manipulate block info */
788 static Y_INLINE yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blk)
790 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
793 ("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),
797 return &dev->blockInfo[blk - dev->internalStartBlock];
800 /*----------------------- YAFFS Functions -----------------------*/
802 int yaffs_GutsInitialise(yaffs_Device * dev);
803 void yaffs_Deinitialise(yaffs_Device * dev);
805 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev);
807 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
808 yaffs_Object * newDir, const YCHAR * newName);
810 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name);
811 int yaffs_DeleteFile(yaffs_Object * obj);
813 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize);
814 int yaffs_GetObjectFileLength(yaffs_Object * obj);
815 int yaffs_GetObjectInode(yaffs_Object * obj);
816 unsigned yaffs_GetObjectType(yaffs_Object * obj);
817 int yaffs_GetObjectLinkCount(yaffs_Object * obj);
819 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr);
820 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr);
822 /* File operations */
823 int yaffs_ReadDataFromFile(yaffs_Object * obj, __u8 * buffer, loff_t offset,
825 int yaffs_WriteDataToFile(yaffs_Object * obj, const __u8 * buffer, loff_t offset,
826 int nBytes, int writeThrough);
827 int yaffs_ResizeFile(yaffs_Object * obj, loff_t newSize);
829 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
830 __u32 mode, __u32 uid, __u32 gid);
831 int yaffs_FlushFile(yaffs_Object * obj, int updateTime);
833 /* Flushing and checkpointing */
834 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev);
836 int yaffs_CheckpointSave(yaffs_Device *dev);
837 int yaffs_CheckpointRestore(yaffs_Device *dev);
839 /* Directory operations */
840 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
841 __u32 mode, __u32 uid, __u32 gid);
842 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * theDir, const YCHAR * name);
843 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
844 int (*fn) (yaffs_Object *));
846 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number);
848 /* Link operations */
849 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
850 yaffs_Object * equivalentObject);
852 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj);
854 /* Symlink operations */
855 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
856 __u32 mode, __u32 uid, __u32 gid,
857 const YCHAR * alias);
858 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj);
860 /* Special inodes (fifos, sockets and devices) */
861 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
862 __u32 mode, __u32 uid, __u32 gid, __u32 rdev);
864 /* Special directories */
865 yaffs_Object *yaffs_Root(yaffs_Device * dev);
866 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev);
868 #ifdef CONFIG_YAFFS_WINCE
869 /* CONFIG_YAFFS_WINCE special stuff */
870 void yfsd_WinFileTimeNow(__u32 target[2]);
875 void yaffs_HandleDeferedFree(yaffs_Object * obj);
879 int yaffs_DumpObject(yaffs_Object * obj);
881 void yaffs_GutsTest(yaffs_Device * dev);
883 /* A few useful functions */
884 void yaffs_InitialiseTags(yaffs_ExtendedTags * tags);
885 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn);
886 int yaffs_CheckFF(__u8 * buffer, int nBytes);
887 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi);