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_CHECKPOINT_VERSION 3
68 #ifdef CONFIG_YAFFS_UNICODE
69 #define YAFFS_MAX_NAME_LENGTH 127
70 #define YAFFS_MAX_ALIAS_LENGTH 79
72 #define YAFFS_MAX_NAME_LENGTH 255
73 #define YAFFS_MAX_ALIAS_LENGTH 159
76 #define YAFFS_SHORT_NAME_LENGTH 15
78 /* Some special object ids for pseudo objects */
79 #define YAFFS_OBJECTID_ROOT 1
80 #define YAFFS_OBJECTID_LOSTNFOUND 2
81 #define YAFFS_OBJECTID_UNLINKED 3
82 #define YAFFS_OBJECTID_DELETED 4
84 /* Sseudo object ids for checkpointing */
85 #define YAFFS_OBJECTID_SB_HEADER 0x10
86 #define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20
87 #define YAFFS_SEQUENCE_CHECKPOINT_DATA 0x21
91 #define YAFFS_MAX_SHORT_OP_CACHES 20
93 #define YAFFS_N_TEMP_BUFFERS 6
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.
99 #define YAFFS_WR_ATTEMPTS (5*64)
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
105 * EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years,
106 * and is a larger number than the lifetime of a 2GB device.
108 #define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000
109 #define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xEFFFFF00
111 /* ChunkCache is used for short read/write operations.*/
113 struct yaffs_ObjectStruct
*object
;
117 int nBytes
; /* Only valid if the cache is dirty */
118 int locked
; /* Can't push out or flush while locked. */
119 #ifdef CONFIG_YAFFS_YAFFS2
122 __u8 data
[YAFFS_BYTES_PER_CHUNK
];
128 /* Tags structures in RAM
129 * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
130 * the structure size will get blown out.
133 #ifndef CONFIG_YAFFS_NO_YAFFS1
136 unsigned serialNumber
:2;
137 unsigned byteCount
:10;
138 unsigned objectId
:18;
140 unsigned unusedStuff
:2;
151 /* Stuff used for extended tags in YAFFS2 */
154 YAFFS_ECC_RESULT_UNKNOWN
,
155 YAFFS_ECC_RESULT_NO_ERROR
,
156 YAFFS_ECC_RESULT_FIXED
,
157 YAFFS_ECC_RESULT_UNFIXED
161 YAFFS_OBJECT_TYPE_UNKNOWN
,
162 YAFFS_OBJECT_TYPE_FILE
,
163 YAFFS_OBJECT_TYPE_SYMLINK
,
164 YAFFS_OBJECT_TYPE_DIRECTORY
,
165 YAFFS_OBJECT_TYPE_HARDLINK
,
166 YAFFS_OBJECT_TYPE_SPECIAL
169 #define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
173 unsigned validMarker0
;
174 unsigned chunkUsed
; /* Status of the chunk: used or unused */
175 unsigned objectId
; /* If 0 then this is not part of an object (unused) */
176 unsigned chunkId
; /* If 0 then this is a header, else a data chunk */
177 unsigned byteCount
; /* Only valid for data chunks */
179 /* The following stuff only has meaning when we read */
180 yaffs_ECCResult eccResult
;
184 unsigned chunkDeleted
; /* The chunk is marked deleted */
185 unsigned serialNumber
; /* Yaffs1 2-bit serial number */
188 unsigned sequenceNumber
; /* The sequence number of this block */
190 /* Extra info if this is an object header (YAFFS2 only) */
192 unsigned extraHeaderInfoAvailable
; /* There is extra info available if this is not zero */
193 unsigned extraParentObjectId
; /* The parent object */
194 unsigned extraIsShrinkHeader
; /* Is it a shrink header? */
195 unsigned extraShadows
; /* Does this shadow another object? */
197 yaffs_ObjectType extraObjectType
; /* What object type? */
199 unsigned extraFileLength
; /* Length if it is a file */
200 unsigned extraEquivalentObjectId
; /* Equivalent object Id if it is a hard link */
202 unsigned validMarker1
;
204 } yaffs_ExtendedTags
;
206 /* Spare structure for YAFFS1 */
212 __u8 pageStatus
; /* set to 0 to delete the chunk */
222 /*Special structure for passing through to mtd */
223 struct yaffs_NANDSpare
{
229 /* Block data in RAM */
232 YAFFS_BLOCK_STATE_UNKNOWN
= 0,
234 YAFFS_BLOCK_STATE_SCANNING
,
235 YAFFS_BLOCK_STATE_NEEDS_SCANNING
,
236 /* The block might have something on it (ie it is allocating or full, perhaps empty)
237 * but it needs to be scanned to determine its true state.
238 * This state is only valid during yaffs_Scan.
239 * NB We tolerate empty because the pre-scanner might be incapable of deciding
240 * However, if this state is returned on a YAFFS2 device, then we expect a sequence number
243 YAFFS_BLOCK_STATE_EMPTY
,
244 /* This block is empty */
246 YAFFS_BLOCK_STATE_ALLOCATING
,
247 /* This block is partially allocated.
248 * At least one page holds valid data.
249 * This is the one currently being used for page
250 * allocation. Should never be more than one of these
253 YAFFS_BLOCK_STATE_FULL
,
254 /* All the pages in this block have been allocated.
257 YAFFS_BLOCK_STATE_DIRTY
,
258 /* All pages have been allocated and deleted.
259 * Erase me, reuse me.
262 YAFFS_BLOCK_STATE_CHECKPOINT
,
263 /* This block is assigned to holding checkpoint data.
266 YAFFS_BLOCK_STATE_COLLECTING
,
267 /* This block is being garbage collected */
269 YAFFS_BLOCK_STATE_DEAD
270 /* This block has failed and is not in use */
273 #define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
278 int softDeletions
:10; /* number of soft deleted pages */
279 int pagesInUse
:10; /* number of pages in use */
280 unsigned blockState
:4; /* One of the above block states. NB use unsigned because enum is sometimes an int */
281 __u32 needsRetiring
:1; /* Data has failed on this block, need to get valid data off */
282 /* and retire the block. */
283 __u32 skipErasedCheck
: 1; /* If this is set we can skip the erased check on this block */
284 __u32 gcPrioritise
: 1; /* An ECC check or blank check has failed on this block.
285 It should be prioritised for GC */
286 __u32 chunkErrorStrikes
:3; /* How many times we've had ecc etc failures on this block and tried to reuse it */
288 #ifdef CONFIG_YAFFS_YAFFS2
289 __u32 hasShrinkHeader
:1; /* This block has at least one shrink object header */
290 __u32 sequenceNumber
; /* block sequence number for yaffs2 */
295 /* -------------------------- Object structure -------------------------------*/
296 /* This is the object structure as stored on NAND */
299 yaffs_ObjectType type
;
301 /* Apply to everything */
303 __u16 sum__NoLongerUsed
; /* checksum of name. No longer used */
304 YCHAR name
[YAFFS_MAX_NAME_LENGTH
+ 1];
306 /* The following apply to directories, files, symlinks - not hard links */
307 __u32 yst_mode
; /* protection */
309 #ifdef CONFIG_YAFFS_WINCE
310 __u32 notForWinCE
[5];
319 /* File size applies to files only */
322 /* Equivalent object id applies to hard links only. */
323 int equivalentObjectId
;
325 /* Alias is for symlinks only. */
326 YCHAR alias
[YAFFS_MAX_ALIAS_LENGTH
+ 1];
328 __u32 yst_rdev
; /* device stuff for block and char devices (major/min) */
330 #ifdef CONFIG_YAFFS_WINCE
338 __u32 inbandShadowsObject
;
339 __u32 inbandIsShrink
;
341 __u32 reservedSpace
[2];
342 int shadowsObject
; /* This object header shadows the specified object if > 0 */
344 /* isShrink applies to object headers written when we shrink the file (ie resize) */
347 } yaffs_ObjectHeader
;
349 /*--------------------------- Tnode -------------------------- */
351 union yaffs_Tnode_union
{
352 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
353 union yaffs_Tnode_union
*internal
[YAFFS_NTNODES_INTERNAL
+ 1];
355 union yaffs_Tnode_union
*internal
[YAFFS_NTNODES_INTERNAL
];
357 /* __u16 level0[YAFFS_NTNODES_LEVEL0]; */
361 typedef union yaffs_Tnode_union yaffs_Tnode
;
363 struct yaffs_TnodeList_struct
{
364 struct yaffs_TnodeList_struct
*next
;
368 typedef struct yaffs_TnodeList_struct yaffs_TnodeList
;
370 /*------------------------ Object -----------------------------*/
371 /* An object can be one of:
372 * - a directory (no data, has children links
373 * - a regular file (data.... not prunes :->).
374 * - a symlink [symbolic link] (the alias).
380 __u32 scannedFileSize
;
384 } yaffs_FileStructure
;
387 struct ylist_head children
; /* list of child links */
388 } yaffs_DirectoryStructure
;
392 } yaffs_SymLinkStructure
;
395 struct yaffs_ObjectStruct
*equivalentObject
;
396 __u32 equivalentObjectId
;
397 } yaffs_HardLinkStructure
;
400 yaffs_FileStructure fileVariant
;
401 yaffs_DirectoryStructure directoryVariant
;
402 yaffs_SymLinkStructure symLinkVariant
;
403 yaffs_HardLinkStructure hardLinkVariant
;
404 } yaffs_ObjectVariant
;
406 struct yaffs_ObjectStruct
{
407 __u8 deleted
:1; /* This should only apply to unlinked files. */
408 __u8 softDeleted
:1; /* it has also been soft deleted */
409 __u8 unlinked
:1; /* An unlinked file. The file should be in the unlinked directory.*/
410 __u8 fake
:1; /* A fake object has no presence on NAND. */
411 __u8 renameAllowed
:1; /* Some objects are not allowed to be renamed. */
412 __u8 unlinkAllowed
:1;
413 __u8 dirty
:1; /* the object needs to be written to flash */
414 __u8 valid
:1; /* When the file system is being loaded up, this
415 * object might be created before the data
416 * is available (ie. file data records appear before the header).
418 __u8 lazyLoaded
:1; /* This object has been lazy loaded and is missing some detail */
420 __u8 deferedFree
:1; /* For Linux kernel. Object is removed from NAND, but is
421 * still in the inode cache. Free of object is defered.
422 * until the inode is released.
425 __u8 serial
; /* serial number of chunk in NAND. Cached here */
426 __u16 sum
; /* sum of the name to speed searching */
428 struct yaffs_DeviceStruct
*myDev
; /* The device I'm on */
430 struct ylist_head hashLink
; /* list of objects in this hash bucket */
432 struct ylist_head hardLinks
; /* all the equivalent hard linked objects */
434 /* directory structure stuff */
435 /* also used for linking up the free list */
436 struct yaffs_ObjectStruct
*parent
;
437 struct ylist_head siblings
;
439 /* Where's my object header in NAND? */
442 int nDataChunks
; /* Number of data chunks attached to the file. */
444 __u32 objectId
; /* the object id value */
448 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
449 YCHAR shortName
[YAFFS_SHORT_NAME_LENGTH
+ 1];
456 #ifdef CONFIG_YAFFS_WINCE
471 struct inode
*myInode
;
475 yaffs_ObjectType variantType
;
477 yaffs_ObjectVariant variant
;
481 typedef struct yaffs_ObjectStruct yaffs_Object
;
483 struct yaffs_ObjectList_struct
{
484 yaffs_Object
*objects
;
485 struct yaffs_ObjectList_struct
*next
;
488 typedef struct yaffs_ObjectList_struct yaffs_ObjectList
;
491 struct ylist_head list
;
493 } yaffs_ObjectBucket
;
496 /* yaffs_CheckpointObject holds the definition of an object as dumped
506 yaffs_ObjectType variantType
:3;
511 __u8 renameAllowed
:1;
512 __u8 unlinkAllowed
:1;
516 __u32 fileSizeOrEquivalentObjectId
;
518 }yaffs_CheckpointObject
;
520 /*--------------------- Temporary buffers ----------------
522 * These are chunk-sized working buffers. Each device has a few
527 int line
; /* track from whence this buffer was allocated */
531 /*----------------- Device ---------------------------------*/
533 struct yaffs_DeviceStruct
{
534 struct ylist_head devList
;
537 /* Entry parameters set up way early. Yaffs sets up the rest.*/
538 int nDataBytesPerChunk
; /* Should be a power of 2 >= 512 */
539 int nChunksPerBlock
; /* does not need to be a power of 2 */
540 int nBytesPerSpare
; /* spare area size */
541 int startBlock
; /* Start block we're allowed to use */
542 int endBlock
; /* End block we're allowed to use */
543 int nReservedBlocks
; /* We want this tuneable so that we can reduce */
544 /* reserved blocks on NOR and RAM. */
547 /* Stuff used by the shared space checkpointing mechanism */
548 /* If this value is zero, then this mechanism is disabled */
550 // int nCheckpointReservedBlocks; /* Blocks to reserve for checkpoint data */
555 int nShortOpCaches
; /* If <= 0, then short op caching is disabled, else
556 * the number of short op caches (don't use too many)
559 int useHeaderFileSize
; /* Flag to determine if we should use file sizes from the header */
561 int useNANDECC
; /* Flag to decide whether or not to use NANDECC */
563 void *genericDevice
; /* Pointer to device context
564 * On an mtd this holds the mtd pointer.
568 /* NAND access functions (Must be set before calling YAFFS)*/
570 int (*writeChunkToNAND
) (struct yaffs_DeviceStruct
* dev
,
571 int chunkInNAND
, const __u8
* data
,
572 const yaffs_Spare
* spare
);
573 int (*readChunkFromNAND
) (struct yaffs_DeviceStruct
* dev
,
574 int chunkInNAND
, __u8
* data
,
575 yaffs_Spare
* spare
);
576 int (*eraseBlockInNAND
) (struct yaffs_DeviceStruct
* dev
,
578 int (*initialiseNAND
) (struct yaffs_DeviceStruct
* dev
);
580 #ifdef CONFIG_YAFFS_YAFFS2
581 int (*writeChunkWithTagsToNAND
) (struct yaffs_DeviceStruct
* dev
,
582 int chunkInNAND
, const __u8
* data
,
583 const yaffs_ExtendedTags
* tags
);
584 int (*readChunkWithTagsFromNAND
) (struct yaffs_DeviceStruct
* dev
,
585 int chunkInNAND
, __u8
* data
,
586 yaffs_ExtendedTags
* tags
);
587 int (*markNANDBlockBad
) (struct yaffs_DeviceStruct
* dev
, int blockNo
);
588 int (*queryNANDBlock
) (struct yaffs_DeviceStruct
* dev
, int blockNo
,
589 yaffs_BlockState
* state
, __u32
*sequenceNumber
);
594 /* The removeObjectCallback function must be supplied by OS flavours that
595 * need it. The Linux kernel does not use this, but yaffs direct does use
596 * it to implement the faster readdir
598 void (*removeObjectCallback
)(struct yaffs_ObjectStruct
*obj
);
600 /* Callback to mark the superblock dirsty */
601 void (*markSuperBlockDirty
)(void * superblock
);
603 int wideTnodesDisabled
; /* Set to disable wide tnodes */
605 YCHAR
*pathDividers
; /* String of legal path dividers */
607 /* End of stuff that must be set before initialisation. */
609 /* Checkpoint control. Can be set before or after initialisation */
610 __u8 skipCheckpointRead
;
611 __u8 skipCheckpointWrite
;
613 /* Runtime parameters. Set up by YAFFS. */
615 __u16 chunkGroupBits
; /* 0 for devices <= 32MB. else log2(nchunks) - 16 */
616 __u16 chunkGroupSize
; /* == 2^^chunkGroupBits */
618 /* Stuff to support wide tnodes */
622 /* Stuff for figuring out file offset to chunk conversions */
623 __u32 chunkShift
; /* Shift value */
624 __u32 chunkDiv
; /* Divisor after shifting: 1 for power-of-2 sizes */
625 __u32 chunkMask
; /* Mask to use for power-of-2 case */
627 /* Stuff to handle inband tags */
629 __u32 totalBytesPerChunk
;
633 struct semaphore sem
; /* Semaphore for waiting on erasure.*/
634 struct semaphore grossLock
; /* Gross locking semaphore */
635 __u8
*spareBuffer
; /* For mtdif2 use. Don't know the size of the buffer
636 * at compile time so we have to allocate it.
638 void (*putSuperFunc
) (struct super_block
* sb
);
646 /* Stuff to support block offsetting to support start block zero */
647 int internalStartBlock
;
648 int internalEndBlock
;
653 /* Runtime checkpointing stuff */
654 int checkpointPageSequence
; /* running sequence number of checkpoint pages */
655 int checkpointByteCount
;
656 int checkpointByteOffset
;
657 __u8
*checkpointBuffer
;
658 int checkpointOpenForWrite
;
659 int blocksInCheckpoint
;
660 int checkpointCurrentChunk
;
661 int checkpointCurrentBlock
;
662 int checkpointNextBlock
;
663 int *checkpointBlockList
;
664 int checkpointMaxBlocks
;
668 int nCheckpointBlocksRequired
; /* Number of blocks needed to store current checkpoint set */
671 yaffs_BlockInfo
*blockInfo
;
672 __u8
*chunkBits
; /* bitmap of chunks in use */
673 unsigned blockInfoAlt
:1; /* was allocated using alternative strategy */
674 unsigned chunkBitsAlt
:1; /* was allocated using alternative strategy */
675 int chunkBitmapStride
; /* Number of bytes of chunkBits per block.
676 * Must be consistent with nChunksPerBlock.
680 int allocationBlock
; /* Current block being allocated off */
681 __u32 allocationPage
;
682 int allocationBlockFinder
; /* Used to search for next allocation block */
686 yaffs_Tnode
*freeTnodes
;
688 yaffs_TnodeList
*allocatedTnodeList
;
693 yaffs_Object
*freeObjects
;
696 yaffs_ObjectList
*allocatedObjectList
;
698 yaffs_ObjectBucket objectBucket
[YAFFS_NOBJECT_BUCKETS
];
702 int currentDirtyChecker
; /* Used to find current dirtiest block */
704 __u32
*gcCleanupList
; /* objects to delete at the end of a GC. */
705 int nonAggressiveSkip
; /* GC state/mode */
711 int nErasureFailures
;
713 int garbageCollections
;
714 int passiveGarbageCollections
;
722 int nUnmarkedDeletions
;
724 int hasPendingPrioritisedGCs
; /* We think this device might have pending prioritised gcs */
726 /* Special directories */
727 yaffs_Object
*rootDir
;
728 yaffs_Object
*lostNFoundDir
;
730 /* Buffer areas for storing data to recover from write failures TODO
731 * __u8 bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
732 * yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK];
735 int bufferedBlock
; /* Which block is buffered here? */
736 int doingBufferedBlockRewrite
;
738 yaffs_ChunkCache
*srCache
;
743 /* Stuff for background deletion and unlinked files.*/
744 yaffs_Object
*unlinkedDir
; /* Directory where unlinked and deleted files live. */
745 yaffs_Object
*deletedDir
; /* Directory where deleted objects are sent to disappear. */
746 yaffs_Object
*unlinkedDeletion
; /* Current file being background deleted.*/
747 int nDeletedFiles
; /* Count of files awaiting deletion;*/
748 int nUnlinkedFiles
; /* Count of unlinked files. */
749 int nBackgroundDeletions
; /* Count of background deletions. */
752 /* Temporary buffer management */
753 yaffs_TempBuffer tempBuffer
[YAFFS_N_TEMP_BUFFERS
];
756 int unmanagedTempAllocations
;
757 int unmanagedTempDeallocations
;
759 /* yaffs2 runtime stuff */
760 unsigned sequenceNumber
; /* Sequence number of currently allocating block */
761 unsigned oldestDirtySequence
;
765 typedef struct yaffs_DeviceStruct yaffs_Device
;
767 /* The static layout of block usage etc is stored in the super block header */
771 int checkpointStartBlock
;
772 int checkpointEndBlock
;
776 } yaffs_SuperBlockHeader
;
778 /* The CheckpointDevice structure holds the device information that changes at runtime and
779 * must be preserved over unmount/mount cycles.
784 int allocationBlock
; /* Current block being allocated off */
785 __u32 allocationPage
;
788 int nDeletedFiles
; /* Count of files awaiting deletion;*/
789 int nUnlinkedFiles
; /* Count of unlinked files. */
790 int nBackgroundDeletions
; /* Count of background deletions. */
792 /* yaffs2 runtime stuff */
793 unsigned sequenceNumber
; /* Sequence number of currently allocating block */
794 unsigned oldestDirtySequence
;
796 } yaffs_CheckpointDevice
;
804 } yaffs_CheckpointValidity
;
807 /*----------------------- YAFFS Functions -----------------------*/
809 int yaffs_GutsInitialise(yaffs_Device
* dev
);
810 void yaffs_Deinitialise(yaffs_Device
* dev
);
812 int yaffs_GetNumberOfFreeChunks(yaffs_Device
* dev
);
814 int yaffs_RenameObject(yaffs_Object
* oldDir
, const YCHAR
* oldName
,
815 yaffs_Object
* newDir
, const YCHAR
* newName
);
817 int yaffs_Unlink(yaffs_Object
* dir
, const YCHAR
* name
);
818 int yaffs_DeleteFile(yaffs_Object
* obj
);
820 int yaffs_GetObjectName(yaffs_Object
* obj
, YCHAR
* name
, int buffSize
);
821 int yaffs_GetObjectFileLength(yaffs_Object
* obj
);
822 int yaffs_GetObjectInode(yaffs_Object
* obj
);
823 unsigned yaffs_GetObjectType(yaffs_Object
* obj
);
824 int yaffs_GetObjectLinkCount(yaffs_Object
* obj
);
826 int yaffs_SetAttributes(yaffs_Object
* obj
, struct iattr
*attr
);
827 int yaffs_GetAttributes(yaffs_Object
* obj
, struct iattr
*attr
);
829 /* File operations */
830 int yaffs_ReadDataFromFile(yaffs_Object
* obj
, __u8
* buffer
, loff_t offset
,
832 int yaffs_WriteDataToFile(yaffs_Object
* obj
, const __u8
* buffer
, loff_t offset
,
833 int nBytes
, int writeThrough
);
834 int yaffs_ResizeFile(yaffs_Object
* obj
, loff_t newSize
);
836 yaffs_Object
*yaffs_MknodFile(yaffs_Object
* parent
, const YCHAR
* name
,
837 __u32 mode
, __u32 uid
, __u32 gid
);
838 int yaffs_FlushFile(yaffs_Object
* obj
, int updateTime
);
840 /* Flushing and checkpointing */
841 void yaffs_FlushEntireDeviceCache(yaffs_Device
*dev
);
843 int yaffs_CheckpointSave(yaffs_Device
*dev
);
844 int yaffs_CheckpointRestore(yaffs_Device
*dev
);
846 /* Directory operations */
847 yaffs_Object
*yaffs_MknodDirectory(yaffs_Object
* parent
, const YCHAR
* name
,
848 __u32 mode
, __u32 uid
, __u32 gid
);
849 yaffs_Object
*yaffs_FindObjectByName(yaffs_Object
* theDir
, const YCHAR
* name
);
850 int yaffs_ApplyToDirectoryChildren(yaffs_Object
* theDir
,
851 int (*fn
) (yaffs_Object
*));
853 yaffs_Object
*yaffs_FindObjectByNumber(yaffs_Device
* dev
, __u32 number
);
855 /* Link operations */
856 yaffs_Object
*yaffs_Link(yaffs_Object
* parent
, const YCHAR
* name
,
857 yaffs_Object
* equivalentObject
);
859 yaffs_Object
*yaffs_GetEquivalentObject(yaffs_Object
* obj
);
861 /* Symlink operations */
862 yaffs_Object
*yaffs_MknodSymLink(yaffs_Object
* parent
, const YCHAR
* name
,
863 __u32 mode
, __u32 uid
, __u32 gid
,
864 const YCHAR
* alias
);
865 YCHAR
*yaffs_GetSymlinkAlias(yaffs_Object
* obj
);
867 /* Special inodes (fifos, sockets and devices) */
868 yaffs_Object
*yaffs_MknodSpecial(yaffs_Object
* parent
, const YCHAR
* name
,
869 __u32 mode
, __u32 uid
, __u32 gid
, __u32 rdev
);
871 /* Special directories */
872 yaffs_Object
*yaffs_Root(yaffs_Device
* dev
);
873 yaffs_Object
*yaffs_LostNFound(yaffs_Device
* dev
);
875 #ifdef CONFIG_YAFFS_WINCE
876 /* CONFIG_YAFFS_WINCE special stuff */
877 void yfsd_WinFileTimeNow(__u32 target
[2]);
882 void yaffs_HandleDeferedFree(yaffs_Object
* obj
);
886 int yaffs_DumpObject(yaffs_Object
* obj
);
888 void yaffs_GutsTest(yaffs_Device
* dev
);
890 /* A few useful functions */
891 void yaffs_InitialiseTags(yaffs_ExtendedTags
* tags
);
892 void yaffs_DeleteChunk(yaffs_Device
* dev
, int chunkId
, int markNAND
, int lyn
);
893 int yaffs_CheckFF(__u8
* buffer
, int nBytes
);
894 void yaffs_HandleChunkError(yaffs_Device
*dev
, yaffs_BlockInfo
*bi
);
896 __u8
*yaffs_GetTempBuffer(yaffs_Device
* dev
, int lineNo
);
897 void yaffs_ReleaseTempBuffer(yaffs_Device
* dev
, __u8
* buffer
, int lineNo
);