/* * YAFFS: Yet another Flash File System . A NAND-flash specific file system. * * Copyright (C) 2002-2010 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" #include "devextras.h" #include "yaffs_list.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 #define YAFFS_NTNODES_LEVEL0 16 #define YAFFS_TNODES_LEVEL0_BITS 4 #define YAFFS_TNODES_LEVEL0_MASK 0xf #define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2) #define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1) #define YAFFS_TNODES_INTERNAL_MASK 0x7 #define YAFFS_TNODES_MAX_LEVEL 6 #ifndef CONFIG_YAFFS_NO_YAFFS1 #define YAFFS_BYTES_PER_SPARE 16 #define YAFFS_BYTES_PER_CHUNK 512 #define YAFFS_CHUNK_SIZE_SHIFT 9 #define YAFFS_CHUNKS_PER_BLOCK 32 #define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK) #endif #define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024 #define YAFFS_MIN_YAFFS2_SPARE_SIZE 32 #define YAFFS_MAX_CHUNK_ID 0x000FFFFF #define YAFFS_ALLOCATION_NOBJECTS 100 #define YAFFS_ALLOCATION_NTNODES 100 #define YAFFS_ALLOCATION_NLINKS 100 #define YAFFS_NOBJECT_BUCKETS 256 #define YAFFS_OBJECT_SPACE 0x40000 #define YAFFS_MAX_OBJECT_ID (YAFFS_OBJECT_SPACE -1) #define YAFFS_CHECKPOINT_VERSION 4 #ifdef CONFIG_YAFFS_UNICODE #define YAFFS_MAX_NAME_LENGTH 127 #define YAFFS_MAX_ALIAS_LENGTH 79 #else #define YAFFS_MAX_NAME_LENGTH 255 #define YAFFS_MAX_ALIAS_LENGTH 159 #endif #define YAFFS_SHORT_NAME_LENGTH 15 /* Some special object ids for pseudo objects */ #define YAFFS_OBJECTID_ROOT 1 #define YAFFS_OBJECTID_LOSTNFOUND 2 #define YAFFS_OBJECTID_UNLINKED 3 #define YAFFS_OBJECTID_DELETED 4 /* Pseudo object ids for checkpointing */ #define YAFFS_OBJECTID_SB_HEADER 0x10 #define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20 #define YAFFS_SEQUENCE_CHECKPOINT_DATA 0x21 #define YAFFS_MAX_SHORT_OP_CACHES 20 #define YAFFS_N_TEMP_BUFFERS 6 /* 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 per second (~1Mbytes) for 15 years, * and is a larger number than the lifetime of a 2GB device. */ #define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000 #define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xEFFFFF00 /* 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.*/ typedef struct { struct yaffs_obj_s *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; } yaffs_cache_t; /* Tags structures in RAM * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise * the structure size will get blown out. */ #ifndef CONFIG_YAFFS_NO_YAFFS1 typedef struct { 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; } yaffs_tags_t; typedef union { yaffs_tags_t as_tags; __u8 as_bytes[8]; } yaffs_tags_union_t; #endif /* Stuff used for extended tags in YAFFS2 */ typedef enum { YAFFS_ECC_RESULT_UNKNOWN, YAFFS_ECC_RESULT_NO_ERROR, YAFFS_ECC_RESULT_FIXED, YAFFS_ECC_RESULT_UNFIXED } yaffs_ecc_result; typedef enum { YAFFS_OBJECT_TYPE_UNKNOWN, YAFFS_OBJECT_TYPE_FILE, YAFFS_OBJECT_TYPE_SYMLINK, YAFFS_OBJECT_TYPE_DIRECTORY, YAFFS_OBJECT_TYPE_HARDLINK, YAFFS_OBJECT_TYPE_SPECIAL } yaffs_obj_type; #define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL typedef struct { unsigned validity1; unsigned chunk_used; /* Status of the chunk: used or unused */ unsigned obj_id; /* If 0 then this is not part of an object (unused) */ unsigned chunk_id; /* If 0 then 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 */ 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; /* There is extra info available if this is 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? */ yaffs_obj_type extra_obj_type; /* What object type? */ unsigned extra_length; /* Length if it is a file */ unsigned extra_equiv_id; /* Equivalent object Id if it is a hard link */ unsigned validty1; } yaffs_ext_tags; /* Spare structure for YAFFS1 */ typedef struct { __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]; } yaffs_spare; /*Special structure for passing through to mtd */ struct yaffs_nand_spare { yaffs_spare spare; int eccres1; int eccres2; }; /* Block data in RAM */ typedef enum { YAFFS_BLOCK_STATE_UNKNOWN = 0, YAFFS_BLOCK_STATE_SCANNING, /* Being scanned */ YAFFS_BLOCK_STATE_NEEDS_SCANNING, /* 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 yaffs_Scan. * 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 */ YAFFS_BLOCK_STATE_EMPTY, /* This block is empty */ YAFFS_BLOCK_STATE_ALLOCATING, /* 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. */ YAFFS_BLOCK_STATE_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. */ YAFFS_BLOCK_STATE_DIRTY, /* The block was full and now all chunks have been deleted. * Erase me, reuse me. */ YAFFS_BLOCK_STATE_CHECKPOINT, /* This block is assigned to holding checkpoint data. */ YAFFS_BLOCK_STATE_COLLECTING, /* This block is being garbage collected */ YAFFS_BLOCK_STATE_DEAD /* This block has failed and is not in use */ } yaffs_block_state_t; #define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1) typedef struct { 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 the block. */ __u32 skip_erased_check:1; /* If this is set we can skip the erased check on this block */ __u32 gc_prioritise:1; /* An ECC check or blank check has failed on this block. It 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 */ #ifdef CONFIG_YAFFS_YAFFS2 __u32 has_shrink_hdr:1; /* This block has at least one shrink object header */ __u32 seq_number; /* block sequence number for yaffs2 */ #endif } yaffs_block_info_t; /* -------------------------- Object structure -------------------------------*/ /* This is the object structure as stored on NAND */ typedef struct { yaffs_obj_type type; /* Apply to everything */ int parent_obj_id; __u16 sum_no_longer_used; /* checksum of name. No longer used */ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; /* The following apply to directories, files, symlinks - not hard links */ __u32 yst_mode; /* protection */ #ifdef CONFIG_YAFFS_WINCE __u32 not_for_wince[5]; #else __u32 yst_uid; __u32 yst_gid; __u32 yst_atime; __u32 yst_mtime; __u32 yst_ctime; #endif /* File size applies to files only */ int file_size; /* Equivalent object id applies to hard links only. */ int equiv_id; /* Alias is for symlinks only. */ YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1]; __u32 yst_rdev; /* device stuff for block and char devices (major/min) */ #ifdef CONFIG_YAFFS_WINCE __u32 win_ctime[2]; __u32 win_atime[2]; __u32 win_mtime[2]; #else __u32 room_to_grow[6]; #endif __u32 inband_shadowed_obj_id; __u32 inband_is_shrink; __u32 reserved[2]; int shadows_obj; /* This object header shadows the specified object if > 0 */ /* is_shrink applies to object headers written when we shrink the file (ie resize) */ __u32 is_shrink; } yaffs_obj_header; /*--------------------------- Tnode -------------------------- */ union yaffs_tnode_union { union yaffs_tnode_union *internal[YAFFS_NTNODES_INTERNAL]; }; typedef union yaffs_tnode_union yaffs_tnode_t; /*------------------------ 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 */ typedef struct { __u32 file_size; __u32 scanned_size; __u32 shrink_size; int top_level; yaffs_tnode_t *top; } yaffs_file_s; typedef struct { struct ylist_head children; /* list of child links */ struct ylist_head dirty; /* Entry for list of dirty directories */ } yaffs_dir_s; typedef struct { YCHAR *alias; } yaffs_symlink_t; typedef struct { struct yaffs_obj_s *equiv_obj; __u32 equiv_id; } yaffs_hard_link_s; typedef union { yaffs_file_s file_variant; yaffs_dir_s dir_variant; yaffs_symlink_t symlink_variant; yaffs_hard_link_s hardlink_variant; } yaffs_obj_variant; struct yaffs_obj_s { __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. The file should be in the unlinked directory.*/ __u8 fake:1; /* A fake object has no presence on NAND. */ __u8 rename_allowed:1; /* Some objects are not allowed to 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 records appear before the header). */ __u8 lazy_loaded:1; /* This object has been lazy loaded and is missing some detail */ __u8 defered_free:1; /* For Linux kernel. 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 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. Valid if xattr_known. */ __u8 serial; /* serial number of chunk in NAND. Cached here */ __u16 sum; /* sum of the name to speed searching */ struct yaffs_dev_s *my_dev; /* The device I'm on */ struct ylist_head hash_link; /* list of objects in this hash bucket */ struct ylist_head hard_links; /* all the equivalent hard linked objects */ /* directory structure stuff */ /* also used for linking up the free list */ struct yaffs_obj_s *parent; struct ylist_head siblings; /* Where's my object header in NAND? */ int hdr_chunk; int n_data_chunks; /* Number of data chunks attached to the file. */ __u32 obj_id; /* the object id value */ __u32 yst_mode; #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1]; #endif #ifdef CONFIG_YAFFS_WINCE __u32 win_ctime[2]; __u32 win_mtime[2]; __u32 win_atime[2]; #else __u32 yst_uid; __u32 yst_gid; __u32 yst_atime; __u32 yst_mtime; __u32 yst_ctime; #endif __u32 yst_rdev; void *my_inode; yaffs_obj_type variant_type; yaffs_obj_variant variant; }; typedef struct yaffs_obj_s yaffs_obj_t; typedef struct { struct ylist_head list; int count; } yaffs_obj_bucket; /* yaffs_checkpt_obj_t holds the definition of an object as dumped * by checkpointing. */ typedef struct { int struct_type; __u32 obj_id; __u32 parent_id; int hdr_chunk; 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; __u32 size_or_equiv_obj; } yaffs_checkpt_obj_t; /*--------------------- Temporary buffers ---------------- * * These are chunk-sized working buffers. Each device has a few */ typedef struct { __u8 *buffer; int line; /* track from whence this buffer was allocated */ int max_line; } yaffs_buffer_t; /*----------------- Device ---------------------------------*/ struct yaffs_param_s { 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; /* We want this 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 (don't use too many). * 10 to 20 is a good bet. */ int use_nand_ecc; /* Flag to decide whether or not to use NANDECC on data (yaffs1) */ 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 we should check to do 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_s *dev, int nand_chunk, const __u8 *data, const yaffs_spare *spare); int (*read_chunk_fn) (struct yaffs_dev_s *dev, int nand_chunk, __u8 *data, yaffs_spare *spare); int (*erase_fn) (struct yaffs_dev_s *dev, int flash_block); int (*initialise_flash_fn) (struct yaffs_dev_s *dev); int (*deinitialise_flash_fn) (struct yaffs_dev_s *dev); #ifdef CONFIG_YAFFS_YAFFS2 int (*write_chunk_tags_fn) (struct yaffs_dev_s *dev, int nand_chunk, const __u8 *data, const yaffs_ext_tags *tags); int (*read_chunk_tags_fn) (struct yaffs_dev_s *dev, int nand_chunk, __u8 *data, yaffs_ext_tags *tags); int (*bad_block_fn) (struct yaffs_dev_s *dev, int block_no); int (*query_block_fn) (struct yaffs_dev_s *dev, int block_no, yaffs_block_state_t *state, __u32 *seq_number); #endif /* 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_s *obj); /* Callback to mark the superblock dirty */ void (*sb_dirty_fn)(struct yaffs_dev_s *dev); /* Callback to control garbage collection. */ unsigned (*gc_control)(struct yaffs_dev_s *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 */ #ifdef CONFIG_YAFFS_AUTO_UNICODE int auto_unicode; #endif int always_check_erased; /* Force chunk erased check always on */ }; typedef struct yaffs_param_s yaffs_param_t; struct yaffs_dev_s { struct yaffs_param_s param; /* Context storage. Holds extra OS specific data for this device */ void *os_context; void *driver_context; struct ylist_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 power-of-2 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 checkpoint 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 */ yaffs_block_info_t *block_info; __u8 *chunk_bits; /* bitmap of chunks in use */ unsigned block_info_alt:1; /* was allocated using alternative strategy */ unsigned chunk_bits_alt:1; /* was allocated using alternative strategy */ 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; 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; /* Special directories */ yaffs_obj_t *root_dir; yaffs_obj_t *lost_n_found; /* Buffer areas for storing data to recover from write failures TODO * __u8 buffered_data[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK]; * yaffs_spare buffered_spare[YAFFS_CHUNKS_PER_BLOCK]; */ int buffered_block; /* Which block is buffered here? */ int doing_buffered_block_rewrite; yaffs_cache_t *cache; int cache_last_use; /* Stuff for background deletion and unlinked files.*/ yaffs_obj_t *unlinked_dir; /* Directory where unlinked and deleted files live. */ yaffs_obj_t *del_dir; /* Directory where deleted objects are sent to disappear. */ yaffs_obj_t *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 */ yaffs_buffer_t 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 ylist_head dirty_dirs; /* List of dirty directories */ /* Statistcs */ __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_retired_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; }; typedef struct yaffs_dev_s yaffs_dev_t; /* The static layout of block usage etc is stored in the super block header */ typedef struct { int StructType; int version; int checkpt_start_block; int checkpt_end_block; int start_block; int end_block; int rfu[100]; } yaffs_sb_header; /* The CheckpointDevice structure holds the device information that changes at runtime and * must be preserved over unmount/mount cycles. */ typedef struct { 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 */ } yaffs_checkpt_dev_t; typedef struct { int struct_type; __u32 magic; __u32 version; __u32 head; } yaffs_checkpt_validty_t; struct yaffs_shadow_fixer_s { int obj_id; int shadowed_id; struct yaffs_shadow_fixer_s *next; }; /* Structure for doing xattr modifications */ typedef struct { int set; /* If 0 then this is a deletion */ const YCHAR *name; const void *data; int size; int flags; int result; }yaffs_xattr_mod; /*----------------------- YAFFS Functions -----------------------*/ int yaffs_guts_initialise(yaffs_dev_t *dev); void yaffs_deinitialise(yaffs_dev_t *dev); int yaffs_get_n_free_chunks(yaffs_dev_t *dev); int yaffs_rename_obj(yaffs_obj_t *old_dir, const YCHAR *old_name, yaffs_obj_t *new_dir, const YCHAR *new_name); int yaffs_unlinker(yaffs_obj_t *dir, const YCHAR *name); int yaffs_del_obj(yaffs_obj_t *obj); int yaffs_get_obj_name(yaffs_obj_t *obj, YCHAR *name, int buffer_size); int yaffs_get_obj_length(yaffs_obj_t *obj); int yaffs_get_obj_inode(yaffs_obj_t *obj); unsigned yaffs_get_obj_type(yaffs_obj_t *obj); int yaffs_get_obj_link_count(yaffs_obj_t *obj); int yaffs_set_attribs(yaffs_obj_t *obj, struct iattr *attr); int yaffs_get_attribs(yaffs_obj_t *obj, struct iattr *attr); /* File operations */ int yaffs_file_rd(yaffs_obj_t *obj, __u8 *buffer, loff_t offset, int n_bytes); int yaffs_wr_file(yaffs_obj_t *obj, const __u8 *buffer, loff_t offset, int n_bytes, int write_trhrough); int yaffs_resize_file(yaffs_obj_t *obj, loff_t new_size); yaffs_obj_t *yaffs_create_file(yaffs_obj_t *parent, const YCHAR *name, __u32 mode, __u32 uid, __u32 gid); int yaffs_flush_file(yaffs_obj_t *obj, int update_time, int data_sync); /* Flushing and checkpointing */ void yaffs_flush_whole_cache(yaffs_dev_t *dev); int yaffs_checkpoint_save(yaffs_dev_t *dev); int yaffs_checkpoint_restore(yaffs_dev_t *dev); /* Directory operations */ yaffs_obj_t *yaffs_create_dir(yaffs_obj_t *parent, const YCHAR *name, __u32 mode, __u32 uid, __u32 gid); yaffs_obj_t *yaffs_find_by_name(yaffs_obj_t *the_dir, const YCHAR *name); int yaffs_ApplyToDirectoryChildren(yaffs_obj_t *the_dir, int (*fn) (yaffs_obj_t *)); yaffs_obj_t *yaffs_find_by_number(yaffs_dev_t *dev, __u32 number); /* Link operations */ yaffs_obj_t *yaffs_link_obj(yaffs_obj_t *parent, const YCHAR *name, yaffs_obj_t *equiv_obj); yaffs_obj_t *yaffs_get_equivalent_obj(yaffs_obj_t *obj); /* Symlink operations */ yaffs_obj_t *yaffs_create_symlink(yaffs_obj_t *parent, const YCHAR *name, __u32 mode, __u32 uid, __u32 gid, const YCHAR *alias); YCHAR *yaffs_get_symlink_alias(yaffs_obj_t *obj); /* Special inodes (fifos, sockets and devices) */ yaffs_obj_t *yaffs_create_special(yaffs_obj_t *parent, const YCHAR *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev); int yaffs_set_xattrib(yaffs_obj_t *obj, const YCHAR *name, const void * value, int size, int flags); int yaffs_get_xattrib(yaffs_obj_t *obj, const YCHAR *name, void *value, int size); int yaffs_list_xattrib(yaffs_obj_t *obj, char *buffer, int size); int yaffs_remove_xattrib(yaffs_obj_t *obj, const YCHAR *name); /* Special directories */ yaffs_obj_t *yaffs_root(yaffs_dev_t *dev); yaffs_obj_t *yaffs_lost_n_found(yaffs_dev_t *dev); #ifdef CONFIG_YAFFS_WINCE /* CONFIG_YAFFS_WINCE special stuff */ void yfsd_win_file_time_now(__u32 target[2]); #endif void yaffs_handle_defered_free(yaffs_obj_t *obj); void yaffs_update_dirty_dirs(yaffs_dev_t *dev); int yaffs_bg_gc(yaffs_dev_t *dev, unsigned urgency); /* Debug dump */ int yaffs_dump_obj(yaffs_obj_t *obj); void yaffs_guts_test(yaffs_dev_t *dev); /* A few useful functions to be used within the core files*/ void yaffs_chunk_del(yaffs_dev_t *dev, int chunk_id, int mark_flash, int lyn); int yaffs_check_ff(__u8 *buffer, int n_bytes); void yaffs_handle_chunk_error(yaffs_dev_t *dev, yaffs_block_info_t *bi); __u8 *yaffs_get_temp_buffer(yaffs_dev_t *dev, int line_no); void yaffs_release_temp_buffer(yaffs_dev_t *dev, __u8 *buffer, int line_no); yaffs_obj_t *yaffs_find_or_create_by_number(yaffs_dev_t *dev, int number, yaffs_obj_type type); int yaffs_put_chunk_in_file(yaffs_obj_t *in, int inode_chunk, int nand_chunk, int in_scan); void yaffs_set_obj_name(yaffs_obj_t *obj, const YCHAR *name); void yaffs_set_obj_name_from_oh(yaffs_obj_t *obj, const yaffs_obj_header *oh); void yaffs_add_obj_to_dir(yaffs_obj_t *directory, yaffs_obj_t *obj); YCHAR *yaffs_clone_str(const YCHAR *str); void yaffs_link_fixup(yaffs_dev_t *dev, yaffs_obj_t *hard_list); void yaffs_block_became_dirty(yaffs_dev_t *dev, int block_no); int yaffs_update_oh(yaffs_obj_t *in, const YCHAR *name, int force, int is_shrink, int shadows, yaffs_xattr_mod *xop); void yaffs_handle_shadowed_obj(yaffs_dev_t *dev, int obj_id, int backward_scanning); int yaffs_check_alloc_available(yaffs_dev_t *dev, int n_chunks); yaffs_tnode_t *yaffs_get_tnode(yaffs_dev_t *dev); yaffs_tnode_t *yaffs_add_find_tnode_0(yaffs_dev_t *dev, yaffs_file_s *file_struct, __u32 chunk_id, yaffs_tnode_t *passed_tn); int yaffs_do_file_wr(yaffs_obj_t *in, const __u8 *buffer, loff_t offset, int n_bytes, int write_trhrough); void yaffs_resize_file_down( yaffs_obj_t *obj, loff_t new_size); void yaffs_skip_rest_of_block(yaffs_dev_t *dev); int yaffs_count_free_chunks(yaffs_dev_t *dev); yaffs_tnode_t *yaffs_find_tnode_0(yaffs_dev_t *dev, yaffs_file_s *file_struct, __u32 chunk_id); __u32 yaffs_get_group_base(yaffs_dev_t *dev, yaffs_tnode_t *tn, unsigned pos); #endif