2 * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 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__
20 #include "devextras.h"
21 #include "yaffs_list.h"
30 * And what have we got...
32 #define YAFFS_MAGIC 0x5941FF53
34 #define YAFFS_NTNODES_LEVEL0 16
35 #define YAFFS_TNODES_LEVEL0_BITS 4
36 #define YAFFS_TNODES_LEVEL0_MASK 0xf
38 #define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2)
39 #define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1)
40 #define YAFFS_TNODES_INTERNAL_MASK 0x7
41 #define YAFFS_TNODES_MAX_LEVEL 6
43 #ifndef CONFIG_YAFFS_NO_YAFFS1
44 #define YAFFS_BYTES_PER_SPARE 16
45 #define YAFFS_BYTES_PER_CHUNK 512
46 #define YAFFS_CHUNK_SIZE_SHIFT 9
47 #define YAFFS_CHUNKS_PER_BLOCK 32
48 #define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
51 #define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024
52 #define YAFFS_MIN_YAFFS2_SPARE_SIZE 32
54 #define YAFFS_MAX_CHUNK_ID 0x000FFFFF
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
65 #define YAFFS_MAX_OBJECT_ID (YAFFS_OBJECT_SPACE -1)
67 #define YAFFS_CHECKPOINT_VERSION 4
69 #ifdef CONFIG_YAFFS_UNICODE
70 #define YAFFS_MAX_NAME_LENGTH 127
71 #define YAFFS_MAX_ALIAS_LENGTH 79
73 #define YAFFS_MAX_NAME_LENGTH 255
74 #define YAFFS_MAX_ALIAS_LENGTH 159
77 #define YAFFS_SHORT_NAME_LENGTH 15
79 /* Some special object ids for pseudo objects */
80 #define YAFFS_OBJECTID_ROOT 1
81 #define YAFFS_OBJECTID_LOSTNFOUND 2
82 #define YAFFS_OBJECTID_UNLINKED 3
83 #define YAFFS_OBJECTID_DELETED 4
85 /* Pseudo object ids for checkpointing */
86 #define YAFFS_OBJECTID_SB_HEADER 0x10
87 #define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20
88 #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 /* Special sequence number for bad block that failed to be marked bad */
112 #define YAFFS_SEQUENCE_BAD_BLOCK 0xFFFF0000
114 /* ChunkCache is used for short read/write operations.*/
116 struct yaffs_obj *object;
120 int n_bytes; /* Only valid if the cache is dirty */
121 int locked; /* Can't push out or flush while locked. */
127 /* Tags structures in RAM
128 * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
129 * the structure size will get blown out.
132 #ifndef CONFIG_YAFFS_NO_YAFFS1
134 unsigned chunk_id:20;
135 unsigned serial_number:2;
136 unsigned n_bytes_lsb:10;
139 unsigned n_bytes_msb:2;
142 union yaffs_tags_union{
143 struct yaffs_tags as_tags;
149 /* Stuff used for extended tags in YAFFS2 */
151 enum yaffs_ecc_result {
152 YAFFS_ECC_RESULT_UNKNOWN,
153 YAFFS_ECC_RESULT_NO_ERROR,
154 YAFFS_ECC_RESULT_FIXED,
155 YAFFS_ECC_RESULT_UNFIXED
158 enum yaffs_obj_type {
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
167 #define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
169 struct yaffs_ext_tags{
172 unsigned chunk_used; /* Status of the chunk: used or unused */
173 unsigned obj_id; /* If 0 then this is not part of an object (unused) */
174 unsigned chunk_id; /* If 0 then this is a header, else a data chunk */
175 unsigned n_bytes; /* Only valid for data chunks */
177 /* The following stuff only has meaning when we read */
178 enum yaffs_ecc_result ecc_result;
182 unsigned is_deleted; /* The chunk is marked deleted */
183 unsigned serial_number; /* Yaffs1 2-bit serial number */
186 unsigned seq_number; /* The sequence number of this block */
188 /* Extra info if this is an object header (YAFFS2 only) */
190 unsigned extra_available; /* There is extra info available if this is not zero */
191 unsigned extra_parent_id; /* The parent object */
192 unsigned extra_is_shrink; /* Is it a shrink header? */
193 unsigned extra_shadows; /* Does this shadow another object? */
195 enum yaffs_obj_type extra_obj_type; /* What object type? */
197 unsigned extra_length; /* Length if it is a file */
198 unsigned extra_equiv_id; /* Equivalent object Id if it is a hard link */
204 /* Spare structure for YAFFS1 */
210 u8 page_status; /* set to 0 to delete the chunk */
220 /*Special structure for passing through to mtd */
221 struct yaffs_nand_spare {
222 struct yaffs_spare spare;
227 /* Block data in RAM */
229 enum yaffs_block_state{
230 YAFFS_BLOCK_STATE_UNKNOWN = 0,
232 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 scanning.
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.
251 * If a block is only partially allocated at mount it is treated as full.
254 YAFFS_BLOCK_STATE_FULL,
255 /* All the pages in this block have been allocated.
256 * If a block was only partially allocated when mounted we treat
257 * it as fully allocated.
260 YAFFS_BLOCK_STATE_DIRTY,
261 /* The block was full and now all chunks have been deleted.
262 * Erase me, reuse me.
265 YAFFS_BLOCK_STATE_CHECKPOINT,
266 /* This block is assigned to holding checkpoint data. */
268 YAFFS_BLOCK_STATE_COLLECTING,
269 /* This block is being garbage collected */
271 YAFFS_BLOCK_STATE_DEAD
272 /* This block has failed and is not in use */
275 #define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
278 struct yaffs_block_info{
280 int soft_del_pages:10; /* number of soft deleted pages */
281 int pages_in_use:10; /* number of pages in use */
282 unsigned block_state:4; /* One of the above block states. NB use unsigned because enum is sometimes an int */
283 u32 needs_retiring:1; /* Data has failed on this block, need to get valid data off */
284 /* and retire the block. */
285 u32 skip_erased_check:1; /* If this is set we can skip the erased check on this block */
286 u32 gc_prioritise:1; /* An ECC check or blank check has failed on this block.
287 It should be prioritised for GC */
288 u32 chunk_error_strikes:3; /* How many times we've had ecc etc failures on this block and tried to reuse it */
290 #ifdef CONFIG_YAFFS_YAFFS2
291 u32 has_shrink_hdr:1; /* This block has at least one shrink object header */
292 u32 seq_number; /* block sequence number for yaffs2 */
297 /* -------------------------- Object structure -------------------------------*/
298 /* This is the object structure as stored on NAND */
300 struct yaffs_obj_hdr {
301 enum yaffs_obj_type type;
303 /* Apply to everything */
305 u16 sum_no_longer_used; /* checksum of name. No longer used */
306 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
308 /* The following apply to directories, files, symlinks - not hard links */
309 u32 yst_mode; /* protection */
311 #ifdef CONFIG_YAFFS_WINCE
312 u32 not_for_wince[5];
321 /* File size applies to files only */
324 /* Equivalent object id applies to hard links only. */
327 /* Alias is for symlinks only. */
328 YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
330 u32 yst_rdev; /* device stuff for block and char devices (major/min) */
332 #ifdef CONFIG_YAFFS_WINCE
340 u32 inband_shadowed_obj_id;
341 u32 inband_is_shrink;
344 int shadows_obj; /* This object header shadows the specified object if > 0 */
346 /* is_shrink applies to object headers written when we shrink the file (ie resize) */
351 /*--------------------------- Tnode -------------------------- */
354 struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL];
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).
367 struct yaffs_file_var {
372 struct yaffs_tnode *top;
375 struct yaffs_dir_var{
376 struct ylist_head children; /* list of child links */
377 struct ylist_head dirty; /* Entry for list of dirty directories */
380 struct yaffs_symlink_var{
384 struct yaffs_hardlink_var{
385 struct yaffs_obj *equiv_obj;
390 struct yaffs_file_var file_variant;
391 struct yaffs_dir_var dir_variant;
392 struct yaffs_symlink_var symlink_variant;
393 struct yaffs_hardlink_var hardlink_variant;
399 u8 deleted:1; /* This should only apply to unlinked files. */
400 u8 soft_del:1; /* it has also been soft deleted */
401 u8 unlinked:1; /* An unlinked file. The file should be in the unlinked directory.*/
402 u8 fake:1; /* A fake object has no presence on NAND. */
403 u8 rename_allowed:1; /* Some objects are not allowed to be renamed. */
405 u8 dirty:1; /* the object needs to be written to flash */
406 u8 valid:1; /* When the file system is being loaded up, this
407 * object might be created before the data
408 * is available (ie. file data records appear before the header).
410 u8 lazy_loaded:1; /* This object has been lazy loaded and is missing some detail */
412 u8 defered_free:1; /* For Linux kernel. Object is removed from NAND, but is
413 * still in the inode cache. Free of object is defered.
414 * until the inode is released.
416 u8 being_created:1; /* This object is still being created so skip some checks. */
417 u8 is_shadowed:1; /* This object is shadowed on the way to being renamed. */
419 u8 xattr_known:1; /* We know if this has object has xattribs or not. */
420 u8 has_xattr:1; /* This object has xattribs. Valid if xattr_known. */
422 u8 serial; /* serial number of chunk in NAND. Cached here */
423 u16 sum; /* sum of the name to speed searching */
425 struct yaffs_dev *my_dev; /* The device I'm on */
427 struct ylist_head hash_link; /* list of objects in this hash bucket */
429 struct ylist_head hard_links; /* all the equivalent hard linked objects */
431 /* directory structure stuff */
432 /* also used for linking up the free list */
433 struct yaffs_obj *parent;
434 struct ylist_head siblings;
436 /* Where's my object header in NAND? */
439 int n_data_chunks; /* Number of data chunks attached to the file. */
441 u32 obj_id; /* the object id value */
445 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
446 YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1];
449 #ifdef CONFIG_YAFFS_WINCE
465 enum yaffs_obj_type variant_type;
467 union yaffs_obj_var variant;
471 struct yaffs_obj_bucket {
472 struct ylist_head list;
477 /* yaffs_checkpt_obj holds the definition of an object as dumped
481 struct yaffs_checkpt_obj{
486 enum yaffs_obj_type variant_type:3;
495 u32 size_or_equiv_obj;
498 /*--------------------- Temporary buffers ----------------
500 * These are chunk-sized working buffers. Each device has a few
503 struct yaffs_buffer {
505 int line; /* track from whence this buffer was allocated */
509 /*----------------- Device ---------------------------------*/
516 * Entry parameters set up way early. Yaffs sets up the rest.
517 * The structure should be zeroed out before use so that unused
518 * and defualt values are zero.
521 int inband_tags; /* Use unband tags */
522 u32 total_bytes_per_chunk; /* Should be >= 512, does not need to be a power of 2 */
523 int chunks_per_block; /* does not need to be a power of 2 */
524 int spare_bytes_per_chunk; /* spare area size */
525 int start_block; /* Start block we're allowed to use */
526 int end_block; /* End block we're allowed to use */
527 int n_reserved_blocks; /* We want this tuneable so that we can reduce */
528 /* reserved blocks on NOR and RAM. */
531 int n_caches; /* If <= 0, then short op caching is disabled, else
532 * the number of short op caches (don't use too many).
533 * 10 to 20 is a good bet.
535 int use_nand_ecc; /* Flag to decide whether or not to use NANDECC on data (yaffs1) */
536 int no_tags_ecc; /* Flag to decide whether or not to do ECC on packed tags (yaffs2) */
538 int is_yaffs2; /* Use yaffs2 mode on this device */
540 int empty_lost_n_found; /* Auto-empty lost+found directory on mount */
542 int refresh_period; /* How often we should check to do a block refresh */
544 /* Checkpoint control. Can be set before or after initialisation */
548 int enable_xattr; /* Enable xattribs */
550 /* NAND access functions (Must be set before calling YAFFS)*/
552 int (*write_chunk_fn) (struct yaffs_dev *dev,
553 int nand_chunk, const u8 *data,
554 const struct yaffs_spare *spare);
555 int (*read_chunk_fn) (struct yaffs_dev *dev,
556 int nand_chunk, u8 *data,
557 struct yaffs_spare *spare);
558 int (*erase_fn) (struct yaffs_dev *dev,
560 int (*initialise_flash_fn) (struct yaffs_dev *dev);
561 int (*deinitialise_flash_fn) (struct yaffs_dev *dev);
563 #ifdef CONFIG_YAFFS_YAFFS2
564 int (*write_chunk_tags_fn) (struct yaffs_dev *dev,
565 int nand_chunk, const u8 *data,
566 const struct yaffs_ext_tags *tags);
567 int (*read_chunk_tags_fn) (struct yaffs_dev *dev,
568 int nand_chunk, u8 *data,
569 struct yaffs_ext_tags *tags);
570 int (*bad_block_fn) (struct yaffs_dev *dev, int block_no);
571 int (*query_block_fn) (struct yaffs_dev *dev, int block_no,
572 enum yaffs_block_state *state, u32 *seq_number);
575 /* The remove_obj_fn function must be supplied by OS flavours that
577 * yaffs direct uses it to implement the faster readdir.
578 * Linux uses it to protect the directory during unlocking.
580 void (*remove_obj_fn)(struct yaffs_obj *obj);
582 /* Callback to mark the superblock dirty */
583 void (*sb_dirty_fn)(struct yaffs_dev *dev);
585 /* Callback to control garbage collection. */
586 unsigned (*gc_control)(struct yaffs_dev *dev);
588 /* Debug control flags. Don't use unless you know what you're doing */
589 int use_header_file_size; /* Flag to determine if we should use file sizes from the header */
590 int disable_lazy_load; /* Disable lazy loading on this device */
591 int wide_tnodes_disabled; /* Set to disable wide tnodes */
592 int disable_soft_del; /* yaffs 1 only: Set to disable the use of softdeletion. */
594 int defered_dir_update; /* Set to defer directory updates */
596 #ifdef CONFIG_YAFFS_AUTO_UNICODE
599 int always_check_erased; /* Force chunk erased check always on */
604 struct yaffs_param param;
606 /* Context storage. Holds extra OS specific data for this device */
609 void *driver_context;
611 struct ylist_head dev_list;
613 /* Runtime parameters. Set up by YAFFS. */
614 int data_bytes_per_chunk;
616 /* Non-wide tnode stuff */
617 u16 chunk_grp_bits; /* Number of bits that need to be resolved if
618 * the tnodes are not wide enough.
620 u16 chunk_grp_size; /* == 2^^chunk_grp_bits */
622 /* Stuff to support wide tnodes */
627 /* Stuff for figuring out file offset to chunk conversions */
628 u32 chunk_shift; /* Shift value */
629 u32 chunk_div; /* Divisor after shifting: 1 for power-of-2 sizes */
630 u32 chunk_mask; /* Mask to use for power-of-2 case */
639 /* Stuff to support block offsetting to support start block zero */
640 int internal_start_block;
641 int internal_end_block;
646 /* Runtime checkpointing stuff */
647 int checkpt_page_seq; /* running sequence number of checkpoint pages */
648 int checkpt_byte_count;
649 int checkpt_byte_offs;
651 int checkpt_open_write;
652 int blocks_in_checkpt;
653 int checkpt_cur_chunk;
654 int checkpt_cur_block;
655 int checkpt_next_block;
656 int *checkpt_block_list;
657 int checkpt_max_blocks;
661 int checkpoint_blocks_required; /* Number of blocks needed to store current checkpoint set */
664 struct yaffs_block_info *block_info;
665 u8 *chunk_bits; /* bitmap of chunks in use */
666 unsigned block_info_alt:1; /* was allocated using alternative strategy */
667 unsigned chunk_bits_alt:1; /* was allocated using alternative strategy */
668 int chunk_bit_stride; /* Number of bytes of chunk_bits per block.
669 * Must be consistent with chunks_per_block.
673 int alloc_block; /* Current block being allocated off */
675 int alloc_block_finder; /* Used to search for next allocation block */
677 /* Object and Tnode memory management */
684 struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS];
689 /* Garbage collection control */
690 u32 *gc_cleanup_list; /* objects to delete at the end of a GC. */
693 unsigned has_pending_prioritised_gc; /* We think this device might have pending prioritised gcs */
695 unsigned gc_block_finder;
696 unsigned gc_dirtiest;
697 unsigned gc_pages_in_use;
698 unsigned gc_not_done;
703 /* Special directories */
704 struct yaffs_obj *root_dir;
705 struct yaffs_obj *lost_n_found;
707 /* Buffer areas for storing data to recover from write failures TODO
708 * u8 buffered_data[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
709 * struct yaffs_spare buffered_spare[YAFFS_CHUNKS_PER_BLOCK];
712 int buffered_block; /* Which block is buffered here? */
713 int doing_buffered_block_rewrite;
715 struct yaffs_cache *cache;
718 /* Stuff for background deletion and unlinked files.*/
719 struct yaffs_obj *unlinked_dir; /* Directory where unlinked and deleted files live. */
720 struct yaffs_obj *del_dir; /* Directory where deleted objects are sent to disappear. */
721 struct yaffs_obj *unlinked_deletion; /* Current file being background deleted.*/
722 int n_deleted_files; /* Count of files awaiting deletion;*/
723 int n_unlinked_files; /* Count of unlinked files. */
724 int n_bg_deletions; /* Count of background deletions. */
726 /* Temporary buffer management */
727 struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS];
730 int unmanaged_buffer_allocs;
731 int unmanaged_buffer_deallocs;
733 /* yaffs2 runtime stuff */
734 unsigned seq_number; /* Sequence number of currently allocating block */
735 unsigned oldest_dirty_seq;
736 unsigned oldest_dirty_block;
738 /* Block refreshing */
739 int refresh_skip; /* A skip down counter. Refresh happens when this gets to zero. */
741 /* Dirty directory handling */
742 struct ylist_head dirty_dirs; /* List of dirty directories */
749 u32 n_erase_failures;
752 u32 passive_gc_count;
753 u32 oldest_dirty_gc_count;
756 u32 n_retired_writes;
757 u32 n_retired_blocks;
760 u32 n_tags_ecc_fixed;
761 u32 n_tags_ecc_unfixed;
763 u32 n_unmarked_deletions;
770 /* The CheckpointDevice structure holds the device information that changes at runtime and
771 * must be preserved over unmount/mount cycles.
773 struct yaffs_checkpt_dev{
776 int alloc_block; /* Current block being allocated off */
780 int n_deleted_files; /* Count of files awaiting deletion;*/
781 int n_unlinked_files; /* Count of unlinked files. */
782 int n_bg_deletions; /* Count of background deletions. */
784 /* yaffs2 runtime stuff */
785 unsigned seq_number; /* Sequence number of currently allocating block */
790 struct yaffs_checkpt_validity{
798 struct yaffs_shadow_fixer {
801 struct yaffs_shadow_fixer *next;
804 /* Structure for doing xattr modifications */
805 struct yaffs_xattr_mod{
806 int set; /* If 0 then this is a deletion */
815 /*----------------------- YAFFS Functions -----------------------*/
817 int yaffs_guts_initialise(struct yaffs_dev *dev);
818 void yaffs_deinitialise(struct yaffs_dev *dev);
820 int yaffs_get_n_free_chunks(struct yaffs_dev *dev);
822 int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
823 struct yaffs_obj *new_dir, const YCHAR *new_name);
825 int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name);
826 int yaffs_del_obj(struct yaffs_obj *obj);
828 int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size);
829 int yaffs_get_obj_length(struct yaffs_obj *obj);
830 int yaffs_get_obj_inode(struct yaffs_obj *obj);
831 unsigned yaffs_get_obj_type(struct yaffs_obj *obj);
832 int yaffs_get_obj_link_count(struct yaffs_obj *obj);
834 int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr);
835 int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr);
837 /* File operations */
838 int yaffs_file_rd(struct yaffs_obj *obj, u8 *buffer, loff_t offset,
840 int yaffs_wr_file(struct yaffs_obj *obj, const u8 *buffer, loff_t offset,
841 int n_bytes, int write_trhrough);
842 int yaffs_resize_file(struct yaffs_obj *obj, loff_t new_size);
844 struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent, const YCHAR *name,
845 u32 mode, u32 uid, u32 gid);
847 int yaffs_flush_file(struct yaffs_obj *obj, int update_time, int data_sync);
849 /* Flushing and checkpointing */
850 void yaffs_flush_whole_cache(struct yaffs_dev *dev);
852 int yaffs_checkpoint_save(struct yaffs_dev *dev);
853 int yaffs_checkpoint_restore(struct yaffs_dev *dev);
855 /* Directory operations */
856 struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
857 u32 mode, u32 uid, u32 gid);
858 struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir, const YCHAR *name);
859 struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number);
861 /* Link operations */
862 struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR *name,
863 struct yaffs_obj *equiv_obj);
865 struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj);
867 /* Symlink operations */
868 struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent, const YCHAR *name,
869 u32 mode, u32 uid, u32 gid,
871 YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj);
873 /* Special inodes (fifos, sockets and devices) */
874 struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent, const YCHAR *name,
875 u32 mode, u32 uid, u32 gid, u32 rdev);
878 int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR *name, const void * value, int size, int flags);
879 int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR *name, void *value, int size);
880 int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size);
881 int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR *name);
883 /* Special directories */
884 struct yaffs_obj *yaffs_root(struct yaffs_dev *dev);
885 struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev);
887 #ifdef CONFIG_YAFFS_WINCE
888 /* CONFIG_YAFFS_WINCE special stuff */
889 void yfsd_win_file_time_now(u32 target[2]);
892 void yaffs_handle_defered_free(struct yaffs_obj *obj);
894 void yaffs_update_dirty_dirs(struct yaffs_dev *dev);
896 int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency);
899 int yaffs_dump_obj(struct yaffs_obj *obj);
901 void yaffs_guts_test(struct yaffs_dev *dev);
903 /* A few useful functions to be used within the core files*/
904 void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash, int lyn);
905 int yaffs_check_ff(u8 *buffer, int n_bytes);
906 void yaffs_handle_chunk_error(struct yaffs_dev *dev, struct yaffs_block_info *bi);
908 u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev, int line_no);
909 void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer, int line_no);
911 struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
913 enum yaffs_obj_type type);
914 int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
915 int nand_chunk, int in_scan);
916 void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR *name);
917 void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
918 const struct yaffs_obj_hdr *oh);
919 void yaffs_add_obj_to_dir(struct yaffs_obj *directory,
920 struct yaffs_obj *obj);
921 YCHAR *yaffs_clone_str(const YCHAR *str);
922 void yaffs_link_fixup(struct yaffs_dev *dev, struct yaffs_obj *hard_list);
923 void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no);
924 int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name,
925 int force, int is_shrink, int shadows,
926 struct yaffs_xattr_mod *xop);
927 void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
928 int backward_scanning);
929 int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks);
930 struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev);
931 struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
932 struct yaffs_file_var *file_struct,
934 struct yaffs_tnode *passed_tn);
936 int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
937 int n_bytes, int write_trhrough);
938 void yaffs_resize_file_down( struct yaffs_obj *obj, loff_t new_size);
939 void yaffs_skip_rest_of_block(struct yaffs_dev *dev);
941 int yaffs_count_free_chunks(struct yaffs_dev *dev);
943 struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
944 struct yaffs_file_var *file_struct,
947 u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn, unsigned pos);