blob: e3558c5a6d04385492eb896e2c2cf429d5547322 [file] [log] [blame]
* YAFFS: Yet another Flash File System . A NAND-flash specific file system.
* Copyright (C) 2002-2011 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
* Created by Charles Manning <>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1 as
* published by the Free Software Foundation.
* Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
#ifndef __YAFFS_GUTS_H__
#define __YAFFS_GUTS_H__
#include "yportenv.h"
#define YAFFS_OK 1
#define YAFFS_FAIL 0
/* Give us a Y=0x59,
* Give us an A=0x41,
* Give us an FF=0xff
* Give us an S=0x53
* And what have we got...
#define YAFFS_MAGIC 0x5941ff53
* Tnodes form a tree with the tnodes in "levels"
* Levels greater than 0 hold 8 slots which point to other tnodes.
* Those at level 0 hold 16 slots which point to chunks in NAND.
* A maximum level of 8 thust supports files of size up to:
* 2^(3*MAX_LEVEL+4)
* Thus a max level of 8 supports files with up to 2^^28 chunks which gives
* a maximum file size of arounf 51Gbytees with 2k chunks.
/* Constants for YAFFS1 mode */
#define YAFFS_OBJECT_SPACE 0x40000
/* Binary data version stamps */
/* Some special object ids for pseudo objects */
/* Fake object Id for summary data */
/* Pseudo object ids for checkpointing */
/* We limit the number attempts at sucessfully saving a chunk of data.
* Small-page devices have 32 pages per block; large-page devices have 64.
* Default to something in the order of 5 to 10 blocks worth of chunks.
#define YAFFS_WR_ATTEMPTS (5*64)
/* Sequence numbers are used in YAFFS2 to determine block allocation order.
* The range is limited slightly to help distinguish bad numbers from good.
* This also allows us to perhaps in the future use special numbers for
* special purposes.
* EFFFFF00 allows the allocation of 8 blocks/second (~1Mbytes) for 15 years,
* and is a larger number than the lifetime of a 2GB device.
/* Special sequence number for bad block that failed to be marked bad */
#define YAFFS_SEQUENCE_BAD_BLOCK 0xffff0000
/* ChunkCache is used for short read/write operations.*/
struct yaffs_cache {
struct yaffs_obj *object;
int chunk_id;
int last_use;
int dirty;
int n_bytes; /* Only valid if the cache is dirty */
int locked; /* Can't push out or flush while locked. */
u8 *data;
/* yaffs1 tags structures in RAM
* NB This uses bitfield. Bitfields should not straddle a u32 boundary
* otherwise the structure size will get blown out.
struct yaffs_tags {
unsigned chunk_id:20;
unsigned serial_number:2;
unsigned n_bytes_lsb:10;
unsigned obj_id:18;
unsigned ecc:12;
unsigned n_bytes_msb:2;
union yaffs_tags_union {
struct yaffs_tags as_tags;
u8 as_bytes[8];
/* Stuff used for extended tags in YAFFS2 */
enum yaffs_ecc_result {
enum yaffs_obj_type {
struct yaffs_ext_tags {
unsigned chunk_used; /* Status of the chunk: used or unused */
unsigned obj_id; /* If 0 this is not used */
unsigned chunk_id; /* If 0 this is a header, else a data chunk */
unsigned n_bytes; /* Only valid for data chunks */
/* The following stuff only has meaning when we read */
enum yaffs_ecc_result ecc_result;
unsigned block_bad;
/* YAFFS 1 stuff */
unsigned is_deleted; /* The chunk is marked deleted */
unsigned serial_number; /* Yaffs1 2-bit serial number */
/* YAFFS2 stuff */
unsigned seq_number; /* The sequence number of this block */
/* Extra info if this is an object header (YAFFS2 only) */
unsigned extra_available; /* Extra info available if not zero */
unsigned extra_parent_id; /* The parent object */
unsigned extra_is_shrink; /* Is it a shrink header? */
unsigned extra_shadows; /* Does this shadow another object? */
enum yaffs_obj_type extra_obj_type; /* What object type? */
loff_t extra_file_size; /* Length if it is a file */
unsigned extra_equiv_id; /* Equivalent object for a hard link */
/* Spare structure for YAFFS1 */
struct yaffs_spare {
u8 tb0;
u8 tb1;
u8 tb2;
u8 tb3;
u8 page_status; /* set to 0 to delete the chunk */
u8 block_status;
u8 tb4;
u8 tb5;
u8 ecc1[3];
u8 tb6;
u8 tb7;
u8 ecc2[3];
/*Special structure for passing through to mtd */
struct yaffs_nand_spare {
struct yaffs_spare spare;
int eccres1;
int eccres2;
/* Block data in RAM */
enum yaffs_block_state {
/* Being scanned */
/* The block might have something on it (ie it is allocating or full,
* perhaps empty) but it needs to be scanned to determine its true
* state.
* This state is only valid during scanning.
* NB We tolerate empty because the pre-scanner might be incapable of
* deciding
* However, if this state is returned on a YAFFS2 device,
* then we expect a sequence number
/* This block is empty */
/* This block is partially allocated.
* At least one page holds valid data.
* This is the one currently being used for page
* allocation. Should never be more than one of these.
* If a block is only partially allocated at mount it is treated as
* full.
/* All the pages in this block have been allocated.
* If a block was only partially allocated when mounted we treat
* it as fully allocated.
/* The block was full and now all chunks have been deleted.
* Erase me, reuse me.
/* This block is assigned to holding checkpoint data. */
/* This block is being garbage collected */
/* This block has failed and is not in use */
struct yaffs_block_info {
int soft_del_pages:10; /* number of soft deleted pages */
int pages_in_use:10; /* number of pages in use */
unsigned block_state:4; /* One of the above block states. */
/* NB use unsigned because enum is sometimes
* an int */
u32 needs_retiring:1; /* Data has failed on this block, */
/*need to get valid data off and retire*/
u32 skip_erased_check:1;/* Skip the erased check on this block */
u32 gc_prioritise:1; /* An ECC check or blank check has failed.
Block should be prioritised for GC */
u32 chunk_error_strikes:3; /* How many times we've had ecc etc
failures on this block and tried to reuse it */
u32 has_summary:1; /* The block has a summary */
u32 has_shrink_hdr:1; /* This block has at least one shrink header */
u32 seq_number; /* block sequence number for yaffs2 */
/* -------------------------- Object structure -------------------------------*/
/* This is the object structure as stored on NAND */
struct yaffs_obj_hdr {
enum yaffs_obj_type type;
/* Apply to everything */
int parent_obj_id;
u16 sum_no_longer_used; /* checksum of name. No longer used */
/* The following apply to all object types except for hard links */
u32 yst_mode; /* protection */
u32 yst_uid;
u32 yst_gid;
u32 yst_atime;
u32 yst_mtime;
u32 yst_ctime;
/* File size applies to files only */
u32 file_size_low;
/* Equivalent object id applies to hard links only. */
int equiv_id;
/* Alias is for symlinks only. */
u32 yst_rdev; /* stuff for block and char devices (major/min) */
u32 win_ctime[2];
u32 win_atime[2];
u32 win_mtime[2];
u32 inband_shadowed_obj_id;
u32 inband_is_shrink;
u32 file_size_high;
u32 reserved[1];
int shadows_obj; /* This object header shadows the
specified object if > 0 */
/* is_shrink applies to object headers written when wemake a hole. */
u32 is_shrink;
/*--------------------------- Tnode -------------------------- */
struct yaffs_tnode {
struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL];
/*------------------------ Object -----------------------------*/
/* An object can be one of:
* - a directory (no data, has children links
* - a regular file (data.... not prunes :->).
* - a symlink [symbolic link] (the alias).
* - a hard link
struct yaffs_file_var {
loff_t file_size;
loff_t scanned_size;
loff_t shrink_size;
int top_level;
struct yaffs_tnode *top;
struct yaffs_dir_var {
struct list_head children; /* list of child links */
struct list_head dirty; /* Entry for list of dirty directories */
struct yaffs_symlink_var {
YCHAR *alias;
struct yaffs_hardlink_var {
struct yaffs_obj *equiv_obj;
u32 equiv_id;
union yaffs_obj_var {
struct yaffs_file_var file_variant;
struct yaffs_dir_var dir_variant;
struct yaffs_symlink_var symlink_variant;
struct yaffs_hardlink_var hardlink_variant;
struct yaffs_obj {
u8 deleted:1; /* This should only apply to unlinked files. */
u8 soft_del:1; /* it has also been soft deleted */
u8 unlinked:1; /* An unlinked file.*/
u8 fake:1; /* A fake object has no presence on NAND. */
u8 rename_allowed:1; /* Some objects cannot be renamed. */
u8 unlink_allowed:1;
u8 dirty:1; /* the object needs to be written to flash */
u8 valid:1; /* When the file system is being loaded up, this
* object might be created before the data
* is available
* ie. file data chunks encountered before
* the header.
u8 lazy_loaded:1; /* This object has been lazy loaded and
* is missing some detail */
u8 defered_free:1; /* Object is removed from NAND, but is
* still in the inode cache.
* Free of object is defered.
* until the inode is released.
u8 being_created:1; /* This object is still being created
* so skip some verification checks. */
u8 is_shadowed:1; /* This object is shadowed on the way
* to being renamed. */
u8 xattr_known:1; /* We know if this has object has xattribs
* or not. */
u8 has_xattr:1; /* This object has xattribs.
* Only valid if xattr_known. */
u8 serial; /* serial number of chunk in NAND.*/
u16 sum; /* sum of the name to speed searching */
struct yaffs_dev *my_dev; /* The device I'm on */
struct list_head hash_link; /* list of objects in hash bucket */
struct list_head hard_links; /* hard linked object chain*/
/* directory structure stuff */
/* also used for linking up the free list */
struct yaffs_obj *parent;
struct list_head siblings;
/* Where's my object header in NAND? */
int hdr_chunk;
int n_data_chunks; /* Number of data chunks for this file. */
u32 obj_id; /* the object id value */
u32 yst_mode;
u32 win_ctime[2];
u32 win_mtime[2];
u32 win_atime[2];
u32 yst_uid;
u32 yst_gid;
u32 yst_atime;
u32 yst_mtime;
u32 yst_ctime;
u32 yst_rdev;
void *my_inode;
enum yaffs_obj_type variant_type;
union yaffs_obj_var variant;
struct yaffs_obj_bucket {
struct list_head list;
int count;
/* yaffs_checkpt_obj holds the definition of an object as dumped
* by checkpointing.
struct yaffs_checkpt_obj {
int struct_type;
u32 obj_id;
u32 parent_id;
int hdr_chunk;
enum yaffs_obj_type variant_type:3;
u8 deleted:1;
u8 soft_del:1;
u8 unlinked:1;
u8 fake:1;
u8 rename_allowed:1;
u8 unlink_allowed:1;
u8 serial;
int n_data_chunks;
loff_t size_or_equiv_obj;
/*--------------------- Temporary buffers ----------------
* These are chunk-sized working buffers. Each device has a few.
struct yaffs_buffer {
u8 *buffer;
int in_use;
/*----------------- Device ---------------------------------*/
struct yaffs_param {
const YCHAR *name;
* Entry parameters set up way early. Yaffs sets up the rest.
* The structure should be zeroed out before use so that unused
* and defualt values are zero.
int inband_tags; /* Use unband tags */
u32 total_bytes_per_chunk; /* Should be >= 512, does not need to
be a power of 2 */
int chunks_per_block; /* does not need to be a power of 2 */
int spare_bytes_per_chunk; /* spare area size */
int start_block; /* Start block we're allowed to use */
int end_block; /* End block we're allowed to use */
int n_reserved_blocks; /* Tuneable so that we can reduce
* reserved blocks on NOR and RAM. */
int n_caches; /* If <= 0, then short op caching is disabled,
* else the number of short op caches.
int use_nand_ecc; /* Flag to decide whether or not to use
* NAND driver ECC on data (yaffs1) */
int tags_9bytes; /* Use 9 byte tags */
int no_tags_ecc; /* Flag to decide whether or not to do ECC
* on packed tags (yaffs2) */
int is_yaffs2; /* Use yaffs2 mode on this device */
int empty_lost_n_found; /* Auto-empty lost+found directory on mount */
int refresh_period; /* How often to check for a block refresh */
/* Checkpoint control. Can be set before or after initialisation */
u8 skip_checkpt_rd;
u8 skip_checkpt_wr;
int enable_xattr; /* Enable xattribs */
/* NAND access functions (Must be set before calling YAFFS) */
int (*write_chunk_fn) (struct yaffs_dev *dev,
int nand_chunk, const u8 *data,
const struct yaffs_spare *spare);
int (*read_chunk_fn) (struct yaffs_dev *dev,
int nand_chunk, u8 *data,
struct yaffs_spare *spare);
int (*erase_fn) (struct yaffs_dev *dev, int flash_block);
int (*initialise_flash_fn) (struct yaffs_dev *dev);
int (*deinitialise_flash_fn) (struct yaffs_dev *dev);
/* yaffs2 mode functions */
int (*write_chunk_tags_fn) (struct yaffs_dev *dev,
int nand_chunk, const u8 *data,
const struct yaffs_ext_tags *tags);
int (*read_chunk_tags_fn) (struct yaffs_dev *dev,
int nand_chunk, u8 *data,
struct yaffs_ext_tags *tags);
int (*bad_block_fn) (struct yaffs_dev *dev, int block_no);
int (*query_block_fn) (struct yaffs_dev *dev, int block_no,
enum yaffs_block_state *state,
u32 *seq_number);
/* The remove_obj_fn function must be supplied by OS flavours that
* need it.
* yaffs direct uses it to implement the faster readdir.
* Linux uses it to protect the directory during unlocking.
void (*remove_obj_fn) (struct yaffs_obj *obj);
/* Callback to mark the superblock dirty */
void (*sb_dirty_fn) (struct yaffs_dev *dev);
/* Callback to control garbage collection. */
unsigned (*gc_control) (struct yaffs_dev *dev);
/* Debug control flags. Don't use unless you know what you're doing */
int use_header_file_size; /* Flag to determine if we should use
* file sizes from the header */
int disable_lazy_load; /* Disable lazy loading on this device */
int wide_tnodes_disabled; /* Set to disable wide tnodes */
int disable_soft_del; /* yaffs 1 only: Set to disable the use of
* softdeletion. */
int defered_dir_update; /* Set to defer directory updates */
int auto_unicode;
int always_check_erased; /* Force chunk erased check always on */
int disable_summary;
int max_objects; /*
* Set to limit the number of objects created.
* 0 = no limit.
struct yaffs_dev {
struct yaffs_param param;
/* Context storage. Holds extra OS specific data for this device */
void *os_context;
void *driver_context;
struct list_head dev_list;
/* Runtime parameters. Set up by YAFFS. */
int data_bytes_per_chunk;
/* Non-wide tnode stuff */
u16 chunk_grp_bits; /* Number of bits that need to be resolved if
* the tnodes are not wide enough.
u16 chunk_grp_size; /* == 2^^chunk_grp_bits */
/* Stuff to support wide tnodes */
u32 tnode_width;
u32 tnode_mask;
u32 tnode_size;
/* Stuff for figuring out file offset to chunk conversions */
u32 chunk_shift; /* Shift value */
u32 chunk_div; /* Divisor after shifting: 1 for 2^n sizes */
u32 chunk_mask; /* Mask to use for power-of-2 case */
int is_mounted;
int read_only;
int is_checkpointed;
/* Stuff to support block offsetting to support start block zero */
int internal_start_block;
int internal_end_block;
int block_offset;
int chunk_offset;
/* Runtime checkpointing stuff */
int checkpt_page_seq; /* running sequence number of checkpt pages */
int checkpt_byte_count;
int checkpt_byte_offs;
u8 *checkpt_buffer;
int checkpt_open_write;
int blocks_in_checkpt;
int checkpt_cur_chunk;
int checkpt_cur_block;
int checkpt_next_block;
int *checkpt_block_list;
int checkpt_max_blocks;
u32 checkpt_sum;
u32 checkpt_xor;
int checkpoint_blocks_required; /* Number of blocks needed to store
* current checkpoint set */
/* Block Info */
struct yaffs_block_info *block_info;
u8 *chunk_bits; /* bitmap of chunks in use */
unsigned block_info_alt:1; /* allocated using alternative alloc */
unsigned chunk_bits_alt:1; /* allocated using alternative alloc */
int chunk_bit_stride; /* Number of bytes of chunk_bits per block.
* Must be consistent with chunks_per_block.
int n_erased_blocks;
int alloc_block; /* Current block being allocated off */
u32 alloc_page;
int alloc_block_finder; /* Used to search for next allocation block */
/* Object and Tnode memory management */
void *allocator;
int n_obj;
int n_tnodes;
int n_hardlinks;
struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS];
u32 bucket_finder;
int n_free_chunks;
/* Garbage collection control */
u32 *gc_cleanup_list; /* objects to delete at the end of a GC. */
u32 n_clean_ups;
unsigned has_pending_prioritised_gc; /* We think this device might
have pending prioritised gcs */
unsigned gc_disable;
unsigned gc_block_finder;
unsigned gc_dirtiest;
unsigned gc_pages_in_use;
unsigned gc_not_done;
unsigned gc_block;
unsigned gc_chunk;
unsigned gc_skip;
struct yaffs_summary_tags *gc_sum_tags;
/* Special directories */
struct yaffs_obj *root_dir;
struct yaffs_obj *lost_n_found;
int buffered_block; /* Which block is buffered here? */
int doing_buffered_block_rewrite;
struct yaffs_cache *cache;
int cache_last_use;
/* Stuff for background deletion and unlinked files. */
struct yaffs_obj *unlinked_dir; /* Directory where unlinked and deleted
files live. */
struct yaffs_obj *del_dir; /* Directory where deleted objects are
sent to disappear. */
struct yaffs_obj *unlinked_deletion; /* Current file being
background deleted. */
int n_deleted_files; /* Count of files awaiting deletion; */
int n_unlinked_files; /* Count of unlinked files. */
int n_bg_deletions; /* Count of background deletions. */
/* Temporary buffer management */
struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS];
int max_temp;
int temp_in_use;
int unmanaged_buffer_allocs;
int unmanaged_buffer_deallocs;
/* yaffs2 runtime stuff */
unsigned seq_number; /* Sequence number of currently
allocating block */
unsigned oldest_dirty_seq;
unsigned oldest_dirty_block;
/* Block refreshing */
int refresh_skip; /* A skip down counter.
* Refresh happens when this gets to zero. */
/* Dirty directory handling */
struct list_head dirty_dirs; /* List of dirty directories */
/* Summary */
int chunks_per_summary;
struct yaffs_summary_tags *sum_tags;
/* Statistics */
u32 n_page_writes;
u32 n_page_reads;
u32 n_erasures;
u32 n_erase_failures;
u32 n_gc_copies;
u32 all_gcs;
u32 passive_gc_count;
u32 oldest_dirty_gc_count;
u32 n_gc_blocks;
u32 bg_gcs;
u32 n_retried_writes;
u32 n_retired_blocks;
u32 n_ecc_fixed;
u32 n_ecc_unfixed;
u32 n_tags_ecc_fixed;
u32 n_tags_ecc_unfixed;
u32 n_deletions;
u32 n_unmarked_deletions;
u32 refresh_count;
u32 cache_hits;
u32 tags_used;
u32 summary_used;
/* The CheckpointDevice structure holds the device information that changes
*at runtime and must be preserved over unmount/mount cycles.
struct yaffs_checkpt_dev {
int struct_type;
int n_erased_blocks;
int alloc_block; /* Current block being allocated off */
u32 alloc_page;
int n_free_chunks;
int n_deleted_files; /* Count of files awaiting deletion; */
int n_unlinked_files; /* Count of unlinked files. */
int n_bg_deletions; /* Count of background deletions. */
/* yaffs2 runtime stuff */
unsigned seq_number; /* Sequence number of currently
* allocating block */
struct yaffs_checkpt_validity {
int struct_type;
u32 magic;
u32 version;
u32 head;
struct yaffs_shadow_fixer {
int obj_id;
int shadowed_id;
struct yaffs_shadow_fixer *next;
/* Structure for doing xattr modifications */
struct yaffs_xattr_mod {
int set; /* If 0 then this is a deletion */
const YCHAR *name;
const void *data;
int size;
int flags;
int result;
/*----------------------- YAFFS Functions -----------------------*/
int yaffs_guts_initialise(struct yaffs_dev *dev);
void yaffs_deinitialise(struct yaffs_dev *dev);
int yaffs_get_n_free_chunks(struct yaffs_dev *dev);
int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
struct yaffs_obj *new_dir, const YCHAR * new_name);
int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name);
int yaffs_del_obj(struct yaffs_obj *obj);
int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size);
loff_t yaffs_get_obj_length(struct yaffs_obj *obj);
int yaffs_get_obj_inode(struct yaffs_obj *obj);
unsigned yaffs_get_obj_type(struct yaffs_obj *obj);
int yaffs_get_obj_link_count(struct yaffs_obj *obj);
/* File operations */
int yaffs_file_rd(struct yaffs_obj *obj, u8 * buffer, loff_t offset,
int n_bytes);
int yaffs_wr_file(struct yaffs_obj *obj, const u8 * buffer, loff_t offset,
int n_bytes, int write_trhrough);
int yaffs_resize_file(struct yaffs_obj *obj, loff_t new_size);
struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
const YCHAR *name, u32 mode, u32 uid,
u32 gid);
int yaffs_flush_file(struct yaffs_obj *obj, int update_time, int data_sync);
/* Flushing and checkpointing */
void yaffs_flush_whole_cache(struct yaffs_dev *dev);
int yaffs_checkpoint_save(struct yaffs_dev *dev);
int yaffs_checkpoint_restore(struct yaffs_dev *dev);
/* Directory operations */
struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
u32 mode, u32 uid, u32 gid);
struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir,
const YCHAR *name);
struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number);
/* Link operations */
struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR *name,
struct yaffs_obj *equiv_obj);
struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj);
/* Symlink operations */
struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
const YCHAR *name, u32 mode, u32 uid,
u32 gid, const YCHAR *alias);
YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj);
/* Special inodes (fifos, sockets and devices) */
struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
const YCHAR *name, u32 mode, u32 uid,
u32 gid, u32 rdev);
int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR *name,
const void *value, int size, int flags);
int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR *name, void *value,
int size);
int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size);
int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR *name);
/* Special directories */
struct yaffs_obj *yaffs_root(struct yaffs_dev *dev);
struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev);
void yaffs_handle_defered_free(struct yaffs_obj *obj);
void yaffs_update_dirty_dirs(struct yaffs_dev *dev);
int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency);
/* Debug dump */
int yaffs_dump_obj(struct yaffs_obj *obj);
void yaffs_guts_test(struct yaffs_dev *dev);
/* A few useful functions to be used within the core files*/
void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
int lyn);
int yaffs_check_ff(u8 *buffer, int n_bytes);
void yaffs_handle_chunk_error(struct yaffs_dev *dev,
struct yaffs_block_info *bi);
u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev);
void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer);
struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
int number,
enum yaffs_obj_type type);
int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
int nand_chunk, int in_scan);
void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR *name);
void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
const struct yaffs_obj_hdr *oh);
void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj);
YCHAR *yaffs_clone_str(const YCHAR *str);
void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list);
void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no);
int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name,
int force, int is_shrink, int shadows,
struct yaffs_xattr_mod *xop);
void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
int backward_scanning);
int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks);
struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev);
struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
struct yaffs_file_var *file_struct,
u32 chunk_id,
struct yaffs_tnode *passed_tn);
int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
int n_bytes, int write_trhrough);
void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size);
void yaffs_skip_rest_of_block(struct yaffs_dev *dev);
int yaffs_count_free_chunks(struct yaffs_dev *dev);
struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
struct yaffs_file_var *file_struct,
u32 chunk_id);
u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
unsigned pos);
int yaffs_is_non_empty_dir(struct yaffs_obj *obj);
void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
int *chunk_out, u32 *offset_out);
* Marshalling functions to get loff_t file sizes into aand out of
* object headers.
void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize);
loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh);
loff_t yaffs_max_file_size(struct yaffs_dev *dev);