2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
3 * yaffs_guts.h: Configuration etc for yaffs_guts
5 * Copyright (C) 2002 Aleph One Ltd.
6 * for Toby Churchill Ltd and Brightstar Engineering
8 * Created by Charles Manning <charles@aleph1.co.uk>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License version 2.1 as
12 * published by the Free Software Foundation.
15 * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
17 * $Id: yaffs_guts.h,v 1.24 2006-10-03 10:13:03 charles Exp $
20 #ifndef __YAFFS_GUTS_H__
21 #define __YAFFS_GUTS_H__
23 #include "devextras.h"
33 * And what have we got...
35 #define YAFFS_MAGIC 0x5941FF53
37 #define YAFFS_NTNODES_LEVEL0 16
38 #define YAFFS_TNODES_LEVEL0_BITS 4
39 #define YAFFS_TNODES_LEVEL0_MASK 0xf
41 #define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2)
42 #define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1)
43 #define YAFFS_TNODES_INTERNAL_MASK 0x7
44 #define YAFFS_TNODES_MAX_LEVEL 6
46 #ifndef CONFIG_YAFFS_NO_YAFFS1
47 #define YAFFS_BYTES_PER_SPARE 16
48 #define YAFFS_BYTES_PER_CHUNK 512
49 #define YAFFS_CHUNK_SIZE_SHIFT 9
50 #define YAFFS_CHUNKS_PER_BLOCK 32
51 #define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
54 #define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024
55 #define YAFFS_MIN_YAFFS2_SPARE_SIZE 32
57 #define YAFFS_MAX_CHUNK_ID 0x000FFFFF
59 #define YAFFS_UNUSED_OBJECT_ID 0x0003FFFF
61 #define YAFFS_ALLOCATION_NOBJECTS 100
62 #define YAFFS_ALLOCATION_NTNODES 100
63 #define YAFFS_ALLOCATION_NLINKS 100
65 #define YAFFS_NOBJECT_BUCKETS 256
68 #define YAFFS_OBJECT_SPACE 0x40000
70 #define YAFFS_NCHECKPOINT_OBJECTS 5000
72 #ifdef CONFIG_YAFFS_UNICODE
73 #define YAFFS_MAX_NAME_LENGTH 127
74 #define YAFFS_MAX_ALIAS_LENGTH 79
76 #define YAFFS_MAX_NAME_LENGTH 255
77 #define YAFFS_MAX_ALIAS_LENGTH 159
80 #define YAFFS_SHORT_NAME_LENGTH 15
82 /* Some special object ids for pseudo objects */
83 #define YAFFS_OBJECTID_ROOT 1
84 #define YAFFS_OBJECTID_LOSTNFOUND 2
85 #define YAFFS_OBJECTID_UNLINKED 3
86 #define YAFFS_OBJECTID_DELETED 4
88 /* Sseudo object ids for checkpointing */
89 #define YAFFS_OBJECTID_SB_HEADER 0x10
90 #define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20
91 #define YAFFS_SEQUENCE_CHECKPOINT_DATA 0x21
95 #define YAFFS_MAX_SHORT_OP_CACHES 20
97 #define YAFFS_N_TEMP_BUFFERS 4
99 /* Sequence numbers are used in YAFFS2 to determine block allocation order.
100 * The range is limited slightly to help distinguish bad numbers from good.
101 * This also allows us to perhaps in the future use special numbers for
103 * EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years,
104 * and is a larger number than the lifetime of a 2GB device.
106 #define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000
107 #define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xEFFFFF00
109 /* ChunkCache is used for short read/write operations.*/
111 struct yaffs_ObjectStruct *object;
115 int nBytes; /* Only valid if the cache is dirty */
116 int locked; /* Can't push out or flush while locked. */
117 #ifdef CONFIG_YAFFS_YAFFS2
120 __u8 data[YAFFS_BYTES_PER_CHUNK];
126 /* Tags structures in RAM
127 * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
128 * the structure size will get blown out.
131 #ifndef CONFIG_YAFFS_NO_YAFFS1
134 unsigned serialNumber:2;
135 unsigned byteCount:10;
136 unsigned objectId:18;
138 unsigned unusedStuff:2;
149 /* Stuff used for extended tags in YAFFS2 */
152 YAFFS_ECC_RESULT_UNKNOWN,
153 YAFFS_ECC_RESULT_NO_ERROR,
154 YAFFS_ECC_RESULT_FIXED,
155 YAFFS_ECC_RESULT_UNFIXED
159 YAFFS_OBJECT_TYPE_UNKNOWN,
160 YAFFS_OBJECT_TYPE_FILE,
161 YAFFS_OBJECT_TYPE_SYMLINK,
162 YAFFS_OBJECT_TYPE_DIRECTORY,
163 YAFFS_OBJECT_TYPE_HARDLINK,
164 YAFFS_OBJECT_TYPE_SPECIAL
169 unsigned validMarker0;
170 unsigned chunkUsed; /* Status of the chunk: used or unused */
171 unsigned objectId; /* If 0 then this is not part of an object (unused) */
172 unsigned chunkId; /* If 0 then this is a header, else a data chunk */
173 unsigned byteCount; /* Only valid for data chunks */
175 /* The following stuff only has meaning when we read */
176 yaffs_ECCResult eccResult;
180 unsigned chunkDeleted; /* The chunk is marked deleted */
181 unsigned serialNumber; /* Yaffs1 2-bit serial number */
184 unsigned sequenceNumber; /* The sequence number of this block */
186 /* Extra info if this is an object header (YAFFS2 only) */
188 unsigned extraHeaderInfoAvailable; /* There is extra info available if this is not zero */
189 unsigned extraParentObjectId; /* The parent object */
190 unsigned extraIsShrinkHeader; /* Is it a shrink header? */
191 unsigned extraShadows; /* Does this shadow another object? */
193 yaffs_ObjectType extraObjectType; /* What object type? */
195 unsigned extraFileLength; /* Length if it is a file */
196 unsigned extraEquivalentObjectId; /* Equivalent object Id if it is a hard link */
198 unsigned validMarker1;
200 } yaffs_ExtendedTags;
202 /* Spare structure for YAFFS1 */
208 __u8 pageStatus; /* set to 0 to delete the chunk */
218 /*Special structure for passing through to mtd */
219 struct yaffs_NANDSpare {
225 /* Block data in RAM */
228 YAFFS_BLOCK_STATE_UNKNOWN = 0,
230 YAFFS_BLOCK_STATE_SCANNING,
231 YAFFS_BLOCK_STATE_NEEDS_SCANNING,
232 /* The block might have something on it (ie it is allocating or full, perhaps empty)
233 * but it needs to be scanned to determine its true state.
234 * This state is only valid during yaffs_Scan.
235 * NB We tolerate empty because the pre-scanner might be incapable of deciding
236 * However, if this state is returned on a YAFFS2 device, then we expect a sequence number
239 YAFFS_BLOCK_STATE_EMPTY,
240 /* This block is empty */
242 YAFFS_BLOCK_STATE_ALLOCATING,
243 /* This block is partially allocated.
244 * At least one page holds valid data.
245 * This is the one currently being used for page
246 * allocation. Should never be more than one of these
249 YAFFS_BLOCK_STATE_FULL,
250 /* All the pages in this block have been allocated.
253 YAFFS_BLOCK_STATE_DIRTY,
254 /* All pages have been allocated and deleted.
255 * Erase me, reuse me.
258 YAFFS_BLOCK_STATE_CHECKPOINT,
259 /* This block is assigned to holding checkpoint data.
262 YAFFS_BLOCK_STATE_COLLECTING,
263 /* This block is being garbage collected */
265 YAFFS_BLOCK_STATE_DEAD
266 /* This block has failed and is not in use */
271 int softDeletions:12; /* number of soft deleted pages */
272 int pagesInUse:12; /* number of pages in use */
273 yaffs_BlockState blockState:4; /* One of the above block states */
274 __u32 needsRetiring:1; /* Data has failed on this block, need to get valid data off */
275 /* and retire the block. */
276 __u32 skipErasedCheck: 1; /* If this is set we can skip the erased check on this block */
277 __u32 gcPrioritise: 1; /* An ECC check or bank check has failed on this block.
278 It should be prioritised for GC */
280 #ifdef CONFIG_YAFFS_YAFFS2
281 __u32 hasShrinkHeader:1; /* This block has at least one shrink object header */
282 __u32 sequenceNumber; /* block sequence number for yaffs2 */
287 /* -------------------------- Object structure -------------------------------*/
288 /* This is the object structure as stored on NAND */
291 yaffs_ObjectType type;
293 /* Apply to everything */
295 __u16 sum__NoLongerUsed; /* checksum of name. No longer used */
296 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
298 /* Thes following apply to directories, files, symlinks - not hard links */
299 __u32 yst_mode; /* protection */
301 #ifdef CONFIG_YAFFS_WINCE
302 __u32 notForWinCE[5];
311 /* File size applies to files only */
314 /* Equivalent object id applies to hard links only. */
315 int equivalentObjectId;
317 /* Alias is for symlinks only. */
318 YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
320 __u32 yst_rdev; /* device stuff for block and char devices (major/min) */
322 #ifdef CONFIG_YAFFS_WINCE
328 __u32 roomToGrow[10];
331 int shadowsObject; /* This object header shadows the specified object if > 0 */
333 /* isShrink applies to object headers written when we shrink the file (ie resize) */
336 } yaffs_ObjectHeader;
338 /*--------------------------- Tnode -------------------------- */
340 union yaffs_Tnode_union {
341 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
342 union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL + 1];
344 union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL];
346 /* __u16 level0[YAFFS_NTNODES_LEVEL0]; */
350 typedef union yaffs_Tnode_union yaffs_Tnode;
352 struct yaffs_TnodeList_struct {
353 struct yaffs_TnodeList_struct *next;
357 typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
359 /*------------------------ Object -----------------------------*/
360 /* An object can be one of:
361 * - a directory (no data, has children links
362 * - a regular file (data.... not prunes :->).
363 * - a symlink [symbolic link] (the alias).
369 __u32 scannedFileSize;
373 } yaffs_FileStructure;
376 struct list_head children; /* list of child links */
377 } yaffs_DirectoryStructure;
381 } yaffs_SymLinkStructure;
384 struct yaffs_ObjectStruct *equivalentObject;
385 __u32 equivalentObjectId;
386 } yaffs_HardLinkStructure;
389 yaffs_FileStructure fileVariant;
390 yaffs_DirectoryStructure directoryVariant;
391 yaffs_SymLinkStructure symLinkVariant;
392 yaffs_HardLinkStructure hardLinkVariant;
393 } yaffs_ObjectVariant;
395 struct yaffs_ObjectStruct {
396 __u8 deleted:1; /* This should only apply to unlinked files. */
397 __u8 softDeleted:1; /* it has also been soft deleted */
398 __u8 unlinked:1; /* An unlinked file. The file should be in the unlinked directory.*/
399 __u8 fake:1; /* A fake object has no presence on NAND. */
400 __u8 renameAllowed:1; /* Some objects are not allowed to be renamed. */
401 __u8 unlinkAllowed:1;
402 __u8 dirty:1; /* the object needs to be written to flash */
403 __u8 valid:1; /* When the file system is being loaded up, this
404 * object might be created before the data
405 * is available (ie. file data records appear before the header).
407 __u8 lazyLoaded:1; /* This object has been lazy loaded and is missing some detail */
409 __u8 deferedFree:1; /* For Linux kernel. Object is removed from NAND, but is
410 * still in the inode cache. Free of object is defered.
411 * until the inode is released.
414 __u8 serial; /* serial number of chunk in NAND. Cached here */
415 __u16 sum; /* sum of the name to speed searching */
417 struct yaffs_DeviceStruct *myDev; /* The device I'm on */
419 struct list_head hashLink; /* list of objects in this hash bucket */
421 struct list_head hardLinks; /* all the equivalent hard linked objects */
423 /* directory structure stuff */
424 /* also used for linking up the free list */
425 struct yaffs_ObjectStruct *parent;
426 struct list_head siblings;
428 /* Where's my object header in NAND? */
431 int nDataChunks; /* Number of data chunks attached to the file. */
433 __u32 objectId; /* the object id value */
437 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
438 YCHAR shortName[YAFFS_SHORT_NAME_LENGTH + 1];
445 #ifdef CONFIG_YAFFS_WINCE
460 struct inode *myInode;
464 yaffs_ObjectType variantType;
466 yaffs_ObjectVariant variant;
470 typedef struct yaffs_ObjectStruct yaffs_Object;
472 struct yaffs_ObjectList_struct {
473 yaffs_Object *objects;
474 struct yaffs_ObjectList_struct *next;
477 typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
480 struct list_head list;
482 } yaffs_ObjectBucket;
485 /* yaffs_CheckpointObject holds the definition of an object as dumped
495 yaffs_ObjectType variantType:3;
500 __u8 renameAllowed:1;
501 __u8 unlinkAllowed:1;
505 __u32 fileSizeOrEquivalentObjectId;
507 }yaffs_CheckpointObject;
509 /*--------------------- Temporary buffers ----------------
511 * These are chunk-sized working buffers. Each device has a few
516 int line; /* track from whence this buffer was allocated */
520 /*----------------- Device ---------------------------------*/
522 struct yaffs_DeviceStruct {
523 struct list_head devList;
526 /* Entry parameters set up way early. Yaffs sets up the rest.*/
527 int nDataBytesPerChunk; /* Should be a power of 2 >= 512 */
528 int nChunksPerBlock; /* does not need to be a power of 2 */
529 int nBytesPerSpare; /* spare area size */
530 int startBlock; /* Start block we're allowed to use */
531 int endBlock; /* End block we're allowed to use */
532 int nReservedBlocks; /* We want this tuneable so that we can reduce */
533 /* reserved blocks on NOR and RAM. */
535 /* Stuff used by the partitioned checkpointing mechanism */
536 int checkpointStartBlock;
537 int checkpointEndBlock;
539 /* Stuff used by the shared space checkpointing mechanism */
540 /* If this value is zero, then this mechanism is disabled */
542 int nCheckpointReservedBlocks; /* Blocks to reserve for checkpoint data */
547 int nShortOpCaches; /* If <= 0, then short op caching is disabled, else
548 * the number of short op caches (don't use too many)
551 int useHeaderFileSize; /* Flag to determine if we should use file sizes from the header */
553 int useNANDECC; /* Flag to decide whether or not to use NANDECC */
555 void *genericDevice; /* Pointer to device context
556 * On an mtd this holds the mtd pointer.
560 /* NAND access functions (Must be set before calling YAFFS)*/
562 int (*writeChunkToNAND) (struct yaffs_DeviceStruct * dev,
563 int chunkInNAND, const __u8 * data,
564 const yaffs_Spare * spare);
565 int (*readChunkFromNAND) (struct yaffs_DeviceStruct * dev,
566 int chunkInNAND, __u8 * data,
567 yaffs_Spare * spare);
568 int (*eraseBlockInNAND) (struct yaffs_DeviceStruct * dev,
570 int (*initialiseNAND) (struct yaffs_DeviceStruct * dev);
572 #ifdef CONFIG_YAFFS_YAFFS2
573 int (*writeChunkWithTagsToNAND) (struct yaffs_DeviceStruct * dev,
574 int chunkInNAND, const __u8 * data,
575 const yaffs_ExtendedTags * tags);
576 int (*readChunkWithTagsFromNAND) (struct yaffs_DeviceStruct * dev,
577 int chunkInNAND, __u8 * data,
578 yaffs_ExtendedTags * tags);
579 int (*markNANDBlockBad) (struct yaffs_DeviceStruct * dev, int blockNo);
580 int (*queryNANDBlock) (struct yaffs_DeviceStruct * dev, int blockNo,
581 yaffs_BlockState * state, int *sequenceNumber);
586 /* The removeObjectCallback function must be supplied by OS flavours that
587 * need it. The Linux kernel does not use this, but yaffs direct does use
588 * it to implement the faster readdir
590 void (*removeObjectCallback)(struct yaffs_ObjectStruct *obj);
592 /* Callback to mark the superblock dirsty */
593 void (*markSuperBlockDirty)(void * superblock);
595 int wideTnodesDisabled; /* Set to disable wide tnodes */
598 /* End of stuff that must be set before initialisation. */
600 /* Runtime parameters. Set up by YAFFS. */
602 __u16 chunkGroupBits; /* 0 for devices <= 32MB. else log2(nchunks) - 16 */
603 __u16 chunkGroupSize; /* == 2^^chunkGroupBits */
605 /* Stuff to support wide tnodes */
609 /* Stuff to support various file offses to chunk/offset translations */
610 /* "Crumbs" for nDataBytesPerChunk not being a power of 2 */
613 __u32 crumbsPerChunk;
615 /* Straight shifting for nDataBytesPerChunk being a power of 2 */
622 struct semaphore sem; /* Semaphore for waiting on erasure.*/
623 struct semaphore grossLock; /* Gross locking semaphore */
624 __u8 *spareBuffer; /* For mtdif2 use. Don't know the size of the buffer
625 * at compile time so we have to allocate it.
627 void (*putSuperFunc) (struct super_block * sb);
635 /* Stuff to support block offsetting to support start block zero */
636 int internalStartBlock;
637 int internalEndBlock;
642 /* Runtime checkpointing stuff */
643 int checkpointPageSequence; /* running sequence number of checkpoint pages */
644 int checkpointByteCount;
645 int checkpointByteOffset;
646 __u8 *checkpointBuffer;
647 int checkpointOpenForWrite;
648 int blocksInCheckpoint;
649 int checkpointCurrentChunk;
650 int checkpointCurrentBlock;
651 int checkpointNextBlock;
652 int *checkpointBlockList;
653 int checkpointMaxBlocks;
656 yaffs_BlockInfo *blockInfo;
657 __u8 *chunkBits; /* bitmap of chunks in use */
658 unsigned blockInfoAlt:1; /* was allocated using alternative strategy */
659 unsigned chunkBitsAlt:1; /* was allocated using alternative strategy */
660 int chunkBitmapStride; /* Number of bytes of chunkBits per block.
661 * Must be consistent with nChunksPerBlock.
665 int allocationBlock; /* Current block being allocated off */
666 __u32 allocationPage;
667 int allocationBlockFinder; /* Used to search for next allocation block */
671 yaffs_Tnode *freeTnodes;
673 yaffs_TnodeList *allocatedTnodeList;
678 yaffs_Object *freeObjects;
681 yaffs_ObjectList *allocatedObjectList;
683 yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];
687 int currentDirtyChecker; /* Used to find current dirtiest block */
689 __u32 *gcCleanupList; /* objects to delete at the end of a GC. */
695 int nErasureFailures;
697 int garbageCollections;
698 int passiveGarbageCollections;
706 int nUnmarkedDeletions;
708 int hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */
710 /* Special directories */
711 yaffs_Object *rootDir;
712 yaffs_Object *lostNFoundDir;
714 /* Buffer areas for storing data to recover from write failures TODO
715 * __u8 bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
716 * yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK];
719 int bufferedBlock; /* Which block is buffered here? */
720 int doingBufferedBlockRewrite;
722 yaffs_ChunkCache *srCache;
727 /* Stuff for background deletion and unlinked files.*/
728 yaffs_Object *unlinkedDir; /* Directory where unlinked and deleted files live. */
729 yaffs_Object *deletedDir; /* Directory where deleted objects are sent to disappear. */
730 yaffs_Object *unlinkedDeletion; /* Current file being background deleted.*/
731 int nDeletedFiles; /* Count of files awaiting deletion;*/
732 int nUnlinkedFiles; /* Count of unlinked files. */
733 int nBackgroundDeletions; /* Count of background deletions. */
736 yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS];
738 int unmanagedTempAllocations;
739 int unmanagedTempDeallocations;
741 /* yaffs2 runtime stuff */
742 unsigned sequenceNumber; /* Sequence number of currently allocating block */
743 unsigned oldestDirtySequence;
747 typedef struct yaffs_DeviceStruct yaffs_Device;
749 /* The static layout of bllock usage etc is stored in the super block header */
753 int checkpointStartBlock;
754 int checkpointEndBlock;
758 } yaffs_SuperBlockHeader;
760 /* The CheckpointDevice structure holds the device information that changes at runtime and
761 * must be preserved over unmount/mount cycles.
766 int allocationBlock; /* Current block being allocated off */
767 __u32 allocationPage;
770 int nDeletedFiles; /* Count of files awaiting deletion;*/
771 int nUnlinkedFiles; /* Count of unlinked files. */
772 int nBackgroundDeletions; /* Count of background deletions. */
774 /* yaffs2 runtime stuff */
775 unsigned sequenceNumber; /* Sequence number of currently allocating block */
776 unsigned oldestDirtySequence;
778 } yaffs_CheckpointDevice;
786 } yaffs_CheckpointValidity;
788 /* Function to manipulate block info */
789 static Y_INLINE yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blk)
791 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
794 ("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),
798 return &dev->blockInfo[blk - dev->internalStartBlock];
801 /*----------------------- YAFFS Functions -----------------------*/
803 int yaffs_GutsInitialise(yaffs_Device * dev);
804 void yaffs_Deinitialise(yaffs_Device * dev);
806 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev);
808 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
809 yaffs_Object * newDir, const YCHAR * newName);
811 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name);
812 int yaffs_DeleteFile(yaffs_Object * obj);
814 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize);
815 int yaffs_GetObjectFileLength(yaffs_Object * obj);
816 int yaffs_GetObjectInode(yaffs_Object * obj);
817 unsigned yaffs_GetObjectType(yaffs_Object * obj);
818 int yaffs_GetObjectLinkCount(yaffs_Object * obj);
820 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr);
821 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr);
823 /* File operations */
824 int yaffs_ReadDataFromFile(yaffs_Object * obj, __u8 * buffer, loff_t offset,
826 int yaffs_WriteDataToFile(yaffs_Object * obj, const __u8 * buffer, loff_t offset,
827 int nBytes, int writeThrough);
828 int yaffs_ResizeFile(yaffs_Object * obj, loff_t newSize);
830 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
831 __u32 mode, __u32 uid, __u32 gid);
832 int yaffs_FlushFile(yaffs_Object * obj, int updateTime);
834 /* Flushing and checkpointing */
835 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev);
837 int yaffs_CheckpointSave(yaffs_Device *dev);
838 int yaffs_CheckpointRestore(yaffs_Device *dev);
840 /* Directory operations */
841 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
842 __u32 mode, __u32 uid, __u32 gid);
843 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * theDir, const YCHAR * name);
844 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
845 int (*fn) (yaffs_Object *));
847 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number);
849 /* Link operations */
850 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
851 yaffs_Object * equivalentObject);
853 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj);
855 /* Symlink operations */
856 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
857 __u32 mode, __u32 uid, __u32 gid,
858 const YCHAR * alias);
859 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj);
861 /* Special inodes (fifos, sockets and devices) */
862 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
863 __u32 mode, __u32 uid, __u32 gid, __u32 rdev);
865 /* Special directories */
866 yaffs_Object *yaffs_Root(yaffs_Device * dev);
867 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev);
869 #ifdef CONFIG_YAFFS_WINCE
870 /* CONFIG_YAFFS_WINCE special stuff */
871 void yfsd_WinFileTimeNow(__u32 target[2]);
876 void yaffs_HandleDeferedFree(yaffs_Object * obj);
880 int yaffs_DumpObject(yaffs_Object * obj);
882 void yaffs_GutsTest(yaffs_Device * dev);
884 /* A few useful functions */
885 void yaffs_InitialiseTags(yaffs_ExtendedTags * tags);
886 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn);
887 int yaffs_CheckFF(__u8 * buffer, int nBytes);