From aa39fbf7616e8b26833a09cb64c6a40859494599 Mon Sep 17 00:00:00 2001 From: charles Date: Mon, 12 Aug 2002 23:45:18 +0000 Subject: [PATCH] *** empty log message *** --- Documentation/yaffs-todo.html | 30 +- devextras.h | 524 +-- snMakefile | 4 +- utils/Makefile | 22 +- utils/mkyaffs | Bin 6382 -> 15115 bytes utils/mkyaffsimage.c | 440 +++ yaffs_fileem.c | 32 +- yaffs_fs.c | 18 +- yaffs_guts.c | 6838 +++++++++++++++++---------------- yaffs_guts.h | 910 ++--- yaffsdev | Bin 104883 -> 109461 bytes yaffsdev.c | 163 +- yaffsdev.proj | Bin 36864 -> 36864 bytes yportenv.h | 192 +- 14 files changed, 5077 insertions(+), 4096 deletions(-) create mode 100644 utils/mkyaffsimage.c diff --git a/Documentation/yaffs-todo.html b/Documentation/yaffs-todo.html index 8489d72..59ebd0a 100644 --- a/Documentation/yaffs-todo.html +++ b/Documentation/yaffs-todo.html @@ -7,18 +7,24 @@ - + -

YAFFS Todo as at 08/06/2002

+

YAFFS Todo as at 09/07/2002

Stuff not yet done

  1. Directory locking during directory walk.

    -

  2. Other locking....

    -

  3. Test disk full condition. Might not be being handled - correctly.

    -

  4. Add write memory mapping. We probably need this to support +

  5. Other locking.... investigate what is needed.

    +

  6. Test disk full condition.... investigate might not be being + handled correctly.

    +

  7. Add write memory mapping. We probably need this to support loop mounting.

    +

  8. At scan time, check that the file size in the ObjectHeader + matches the filesize of the scanned blocks.

    +
+

Tools to be done

+
    +

Recently done with no known problems (ie. probably needs significant testing)

@@ -36,6 +42,16 @@ significant testing) mot such a good thing to do with newer NANDs which do not like this sort of thing.

+
    +

  1. File pruning is done in reverse order so that if power is + lost part-way through, the file does not have any holes.

    +
+
    +

  1. mkyaffsimage. Tool to make a yaffs image from a directory (in + the spirit of mkcramfs).

    +

  2. Added support for special inodes (pipes, character & + block devices, sockets).

    +

Done, but currently known to be broken

    nothing.

    @@ -44,7 +60,7 @@ significant testing)

    1. Discuss improved NAND page interface with mtd group. This has actually started.

      -

    2. Pull out all YAFFS_OK and YAFFS_FAIL style errors and return +

    3. Pull out all YAFFS_OK and YAFFS_FAIL style errors and return with -ENOMEM style error messages.



    diff --git a/devextras.h b/devextras.h index a28135f..24fe5be 100644 --- a/devextras.h +++ b/devextras.h @@ -1,257 +1,267 @@ -/* - * YAFFS: Yet another FFS. A NAND-flash specific file system. - * devextras.h - * - * Copyright (C) 2002 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 General Public License version 2 as - * published by the Free Software Foundation. - * - * This file is just holds extra declarations used during development. - * Most of these are from kernel includes placed here so we can use them in - * applications. - * - */ - -#ifndef __EXTRAS_H__ -#define __EXTRAS_H__ - -#ifndef __KERNEL__ - -// User space defines - -typedef unsigned char __u8; -typedef unsigned short __u16; -typedef unsigned __u32; - - -/* - * Simple doubly linked list implementation. - * - * Some of the internal functions ("__xxx") are useful when - * manipulating whole lists rather than single entries, as - * sometimes we already know the next/prev entries and we can - * generate better code by using them directly rather than - * using the generic single-entry routines. - */ - - #define prefetch(x) 1 - - -struct list_head { - struct list_head *next, *prev; -}; - -#define LIST_HEAD_INIT(name) { &(name), &(name) } - -#define LIST_HEAD(name) \ - struct list_head name = LIST_HEAD_INIT(name) - -#define INIT_LIST_HEAD(ptr) do { \ - (ptr)->next = (ptr); (ptr)->prev = (ptr); \ -} while (0) - -/* - * Insert a new entry between two known consecutive entries. - * - * This is only for internal list manipulation where we know - * the prev/next entries already! - */ -static __inline__ void __list_add(struct list_head * new, - struct list_head * prev, - struct list_head * next) -{ - next->prev = new; - new->next = next; - new->prev = prev; - prev->next = new; -} - -/** - * list_add - add a new entry - * @new: new entry to be added - * @head: list head to add it after - * - * Insert a new entry after the specified head. - * This is good for implementing stacks. - */ -static __inline__ void list_add(struct list_head *new, struct list_head *head) -{ - __list_add(new, head, head->next); -} - -/** - * list_add_tail - add a new entry - * @new: new entry to be added - * @head: list head to add it before - * - * Insert a new entry before the specified head. - * This is useful for implementing queues. - */ -static __inline__ void list_add_tail(struct list_head *new, struct list_head *head) -{ - __list_add(new, head->prev, head); -} - -/* - * Delete a list entry by making the prev/next entries - * point to each other. - * - * This is only for internal list manipulation where we know - * the prev/next entries already! - */ -static __inline__ void __list_del(struct list_head * prev, - struct list_head * next) -{ - next->prev = prev; - prev->next = next; -} - -/** - * list_del - deletes entry from list. - * @entry: the element to delete from the list. - * Note: list_empty on entry does not return true after this, the entry is in an undefined state. - */ -static __inline__ void list_del(struct list_head *entry) -{ - __list_del(entry->prev, entry->next); -} - -/** - * list_del_init - deletes entry from list and reinitialize it. - * @entry: the element to delete from the list. - */ -static __inline__ void list_del_init(struct list_head *entry) -{ - __list_del(entry->prev, entry->next); - INIT_LIST_HEAD(entry); -} - -/** - * list_empty - tests whether a list is empty - * @head: the list to test. - */ -static __inline__ int list_empty(struct list_head *head) -{ - return head->next == head; -} - -/** - * list_splice - join two lists - * @list: the new list to add. - * @head: the place to add it in the first list. - */ -static __inline__ void list_splice(struct list_head *list, struct list_head *head) -{ - struct list_head *first = list->next; - - if (first != list) { - struct list_head *last = list->prev; - struct list_head *at = head->next; - - first->prev = head; - head->next = first; - - last->next = at; - at->prev = last; - } -} - -/** - * list_entry - get the struct for this entry - * @ptr: the &struct list_head pointer. - * @type: the type of the struct this is embedded in. - * @member: the name of the list_struct within the struct. - */ -#define list_entry(ptr, type, member) \ - ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member))) - -/** - * list_for_each - iterate over a list - * @pos: the &struct list_head to use as a loop counter. - * @head: the head for your list. - */ -#define list_for_each(pos, head) \ - for (pos = (head)->next, prefetch(pos->next); pos != (head); \ - pos = pos->next, prefetch(pos->next)) - -/** - * list_for_each_safe - iterate over a list safe against removal of list entry - * @pos: the &struct list_head to use as a loop counter. - * @n: another &struct list_head to use as temporary storage - * @head: the head for your list. - */ -#define list_for_each_safe(pos, n, head) \ - for (pos = (head)->next, n = pos->next; pos != (head); \ - pos = n, n = pos->next) - - - -#define CURRENT_TIME 0 - - -/* - * File types - */ -#define DT_UNKNOWN 0 -#define DT_FIFO 1 -#define DT_CHR 2 -#define DT_DIR 4 -#define DT_BLK 6 -#define DT_REG 8 -#define DT_LNK 10 -#define DT_SOCK 12 -#define DT_WHT 14 - -#include - -/* - * Attribute flags. These should be or-ed together to figure out what - * has been changed! - */ -#define ATTR_MODE 1 -#define ATTR_UID 2 -#define ATTR_GID 4 -#define ATTR_SIZE 8 -#define ATTR_ATIME 16 -#define ATTR_MTIME 32 -#define ATTR_CTIME 64 -#define ATTR_ATIME_SET 128 -#define ATTR_MTIME_SET 256 -#define ATTR_FORCE 512 /* Not a change, but a change it */ -#define ATTR_ATTR_FLAG 1024 - - -struct iattr { - unsigned int ia_valid; - unsigned ia_mode; - unsigned ia_uid; - unsigned ia_gid; - unsigned ia_size; - unsigned ia_atime; - unsigned ia_mtime; - unsigned ia_ctime; - unsigned int ia_attr_flags; -}; - -#define KERN_DEBUG - - -#else -#include -#include -#include -#include - - -#endif - - - - -#endif - +/* + * YAFFS: Yet another FFS. A NAND-flash specific file system. + * devextras.h + * + * Copyright (C) 2002 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 General Public License version 2 as + * published by the Free Software Foundation. + * + * This file is just holds extra declarations used during development. + * Most of these are from kernel includes placed here so we can use them in + * applications. + * + */ + +#ifndef __EXTRAS_H__ +#define __EXTRAS_H__ + +#if defined WIN32 +#define __inline__ __inline +#define new newHack +#endif + +#if !(defined __KERNEL__) || (defined WIN32) + +// User space defines + +typedef unsigned char __u8; +typedef unsigned short __u16; +typedef unsigned __u32; + + +/* + * Simple doubly linked list implementation. + * + * Some of the internal functions ("__xxx") are useful when + * manipulating whole lists rather than single entries, as + * sometimes we already know the next/prev entries and we can + * generate better code by using them directly rather than + * using the generic single-entry routines. + */ + + #define prefetch(x) 1 + + +struct list_head { + struct list_head *next, *prev; +}; + +#define LIST_HEAD_INIT(name) { &(name), &(name) } + +#define LIST_HEAD(name) \ + struct list_head name = LIST_HEAD_INIT(name) + +#define INIT_LIST_HEAD(ptr) do { \ + (ptr)->next = (ptr); (ptr)->prev = (ptr); \ +} while (0) + +/* + * Insert a new entry between two known consecutive entries. + * + * This is only for internal list manipulation where we know + * the prev/next entries already! + */ +static __inline__ void __list_add(struct list_head * new, + struct list_head * prev, + struct list_head * next) +{ + next->prev = new; + new->next = next; + new->prev = prev; + prev->next = new; +} + +/** + * list_add - add a new entry + * @new: new entry to be added + * @head: list head to add it after + * + * Insert a new entry after the specified head. + * This is good for implementing stacks. + */ +static __inline__ void list_add(struct list_head *new, struct list_head *head) +{ + __list_add(new, head, head->next); +} + +/** + * list_add_tail - add a new entry + * @new: new entry to be added + * @head: list head to add it before + * + * Insert a new entry before the specified head. + * This is useful for implementing queues. + */ +static __inline__ void list_add_tail(struct list_head *new, struct list_head *head) +{ + __list_add(new, head->prev, head); +} + +/* + * Delete a list entry by making the prev/next entries + * point to each other. + * + * This is only for internal list manipulation where we know + * the prev/next entries already! + */ +static __inline__ void __list_del(struct list_head * prev, + struct list_head * next) +{ + next->prev = prev; + prev->next = next; +} + +/** + * list_del - deletes entry from list. + * @entry: the element to delete from the list. + * Note: list_empty on entry does not return true after this, the entry is in an undefined state. + */ +static __inline__ void list_del(struct list_head *entry) +{ + __list_del(entry->prev, entry->next); +} + +/** + * list_del_init - deletes entry from list and reinitialize it. + * @entry: the element to delete from the list. + */ +static __inline__ void list_del_init(struct list_head *entry) +{ + __list_del(entry->prev, entry->next); + INIT_LIST_HEAD(entry); +} + +/** + * list_empty - tests whether a list is empty + * @head: the list to test. + */ +static __inline__ int list_empty(struct list_head *head) +{ + return head->next == head; +} + +/** + * list_splice - join two lists + * @list: the new list to add. + * @head: the place to add it in the first list. + */ +static __inline__ void list_splice(struct list_head *list, struct list_head *head) +{ + struct list_head *first = list->next; + + if (first != list) { + struct list_head *last = list->prev; + struct list_head *at = head->next; + + first->prev = head; + head->next = first; + + last->next = at; + at->prev = last; + } +} + +/** + * list_entry - get the struct for this entry + * @ptr: the &struct list_head pointer. + * @type: the type of the struct this is embedded in. + * @member: the name of the list_struct within the struct. + */ +#define list_entry(ptr, type, member) \ + ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member))) + +/** + * list_for_each - iterate over a list + * @pos: the &struct list_head to use as a loop counter. + * @head: the head for your list. + */ +#define list_for_each(pos, head) \ + for (pos = (head)->next, prefetch(pos->next); pos != (head); \ + pos = pos->next, prefetch(pos->next)) + +/** + * list_for_each_safe - iterate over a list safe against removal of list entry + * @pos: the &struct list_head to use as a loop counter. + * @n: another &struct list_head to use as temporary storage + * @head: the head for your list. + */ +#define list_for_each_safe(pos, n, head) \ + for (pos = (head)->next, n = pos->next; pos != (head); \ + pos = n, n = pos->next) + + + + +/* + * File types + */ +#define DT_UNKNOWN 0 +#define DT_FIFO 1 +#define DT_CHR 2 +#define DT_DIR 4 +#define DT_BLK 6 +#define DT_REG 8 +#define DT_LNK 10 +#define DT_SOCK 12 +#define DT_WHT 14 + +#ifndef WIN32 +#include +#endif + +/* + * Attribute flags. These should be or-ed together to figure out what + * has been changed! + */ +#define ATTR_MODE 1 +#define ATTR_UID 2 +#define ATTR_GID 4 +#define ATTR_SIZE 8 +#define ATTR_ATIME 16 +#define ATTR_MTIME 32 +#define ATTR_CTIME 64 +#define ATTR_ATIME_SET 128 +#define ATTR_MTIME_SET 256 +#define ATTR_FORCE 512 /* Not a change, but a change it */ +#define ATTR_ATTR_FLAG 1024 + + +struct iattr { + unsigned int ia_valid; + unsigned ia_mode; + unsigned ia_uid; + unsigned ia_gid; + unsigned ia_size; + unsigned ia_atime; + unsigned ia_mtime; + unsigned ia_ctime; + unsigned int ia_attr_flags; +}; + +#define KERN_DEBUG + + +#else + +#ifndef WIN32 +#include +#include +#include +#include +#endif + +#endif + + + +#if defined WIN32 +#undef new +#endif + +#endif + diff --git a/snMakefile b/snMakefile index 0872820..1573c7b 100644 --- a/snMakefile +++ b/snMakefile @@ -1,6 +1,6 @@ ######################################################### # Makefile auto generated by Cygnus Source Navigator. -# Target: yaffsdev_disk Date: Jun 05 2002 Time: 02:41:55 PM +# Target: yaffsdev_disk Date: Aug 09 2002 Time: 09:26:40 AM # @@ -72,7 +72,7 @@ yaffsdev: $(yaffsdev_disk_OBJECTS) nand_ecc.o: /opt/yaffs/yportenv.h yaffs_fileem.o: /opt/2.4.18/linux/include/linux/stat.h /opt/2.4.18/linux/include/linux/types.h /usr/include/fcntl.h /usr/include/stdio.h /usr/include/stdlib.h /usr/include/string.h /usr/include/unistd.h /opt/yaffs/yaffs_fileem.h /opt/yaffs/yaffs_guts.h /opt/yaffs/yaffsinterface.h yaffs_guts.o: /opt/yaffs/yaffs_guts.h /opt/yaffs/yaffsinterface.h /opt/yaffs/yportenv.h -yaffsdev.o: yaffs_nandemul.h /usr/include/stdio.h /usr/include/stdlib.h /usr/include/string.h /opt/yaffs/yaffs_fileem.h /opt/yaffs/yaffs_guts.h /opt/yaffs/yaffsinterface.h +yaffsdev.o: /usr/include/stdio.h /usr/include/stdlib.h /usr/include/string.h /opt/yaffs/yaffs_fileem.h /opt/yaffs/yaffs_guts.h /opt/yaffs/yaffs_nandemul.h /opt/yaffs/yaffsinterface.h /opt/yaffs/yportenv.h clean: rm -f *.o diff --git a/utils/Makefile b/utils/Makefile index fdc64a3..a628641 100644 --- a/utils/Makefile +++ b/utils/Makefile @@ -16,19 +16,27 @@ KERNELDIR = /usr/src/kernel-headers-2.4.18 -CFLAGS = -I$(KERNELDIR)/include -O2 -Wall +CFLAGS = -I$(KERNELDIR)/include -I.. -O2 -Wall -OBJS = mkyaffs.o +MKYAFFSOBJS = mkyaffs.o +MKYAFFSIMAGEOBJS = mkyaffsimage.o nand_ecc.o -all: mkyaffs -$(OBJS): %.o: %.c +all: mkyaffs mkyaffsimage + +$(MKYAFFSIMAGEOBJS): %.o: %.c + gcc -c $(CFLAGS) $< -o $@ + +mkyaffsimage: $(MKYAFFSIMAGEOBJS) + gcc -o $@ $(MKYAFFSIMAGEOBJS) + +$(MKYAFFSOBJS): %.o: %.c gcc -c $(CFLAGS) $< -o $@ -mkyaffs: $(OBJS) - gcc -o $@ $(OBJS) +mkyaffs: $(MKYAFFSOBJS) + gcc -o $@ $(MKYAFFSOBJS) clean: - rm -f $(OBJS) core + rm -f $(MKYAFFSOBJS) $(MKYAFFSIMAGEOBJS) core diff --git a/utils/mkyaffs b/utils/mkyaffs index 27e3a086d46a85f525a1695a96617c9ac95d9968..3bf419059c64fda043fd7026953e7d2535aca490 100755 GIT binary patch literal 15115 zcmcgz3y@sJb?yB~tQEyb7!258#(>BQOS3zl{R>B0X|&p~+7+u6A1nAVJD;6r&Caam zy^&TXn1O{jilQu| 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z>;AT&zfS?{WH8fb$?$9}m1;K;V-=jNm5z#3GMn{1(uq{jD|zKiCYlljywaIwe0Xr1 z+1I;$*fa&JWnm^A?SLfhnqygaG?_JJ3}+_G<0wsRHMeZ*>Q9*6iJsm8RAM-2rpvk9 z9^sBYV5PihTboc%jjEKfV_gCFwUlLgt|_BN)7&R!ur3kEu=pe1SeGcuM^)jvqod^vdVoM!J(>#n&ia9uSAShjRb5#<_42+Yx z|LD6Y=Q}Lla2HEr^5xf$O-rpsPv2m7SD!h!Wy|)&usPh--Iu_GTluuQurH~y{N32s J#bqzT{|0 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "yaffs_guts.h" + + +#define MAX_OBJECTS 10000 + +// External functions for ECC on data +void nand_calculate_ecc (const u_char *dat, u_char *ecc_code); +int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc); + + + + + +typedef struct +{ + dev_t dev; + ino_t ino; + int obj; +} objItem; + + +static objItem obj_list[MAX_OBJECTS]; +static int n_obj = 0; +static int obj_id = YAFFS_NOBJECT_BUCKETS + 1; + +static int nObjects, nDirectories, nPages; + +static int outFile; + +static int error; + + +int obj_compare(const void *a, const void * b) +{ + objItem *oa, *ob; + + oa = (objItem *)a; + ob = (objItem *)b; + + if(oa->dev < ob->dev) return -1; + if(oa->dev > ob->dev) return 1; + if(oa->ino < ob->ino) return -1; + if(oa->ino > ob->ino) return 1; + + return 0; +} + + +void add_obj_to_list(dev_t dev, ino_t ino, int obj) +{ + if(n_obj < MAX_OBJECTS) + { + obj_list[n_obj].dev = dev; + obj_list[n_obj].ino = ino; + obj_list[n_obj].obj = obj; + n_obj++; + qsort(obj_list,n_obj,sizeof(objItem),obj_compare); + + } + else + { + // oops! not enough space in the object array + fprintf(stderr,"Not enough space in object array\n"); + exit(2); + } +} + + +int find_obj_in_list(dev_t dev, ino_t ino) +{ + objItem *i = NULL; + objItem test; + + test.dev = dev; + test.ino = ino; + + if(n_obj > 0) + { + i = bsearch(&test,obj_list,n_obj,sizeof(objItem),obj_compare); + } + + if(i) + { + return i->obj; + } + return -1; +} + + + +void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare) +{ + nand_calculate_ecc (data , spare->ecc1); + nand_calculate_ecc (&data[256] , spare->ecc2); +} + +void yaffs_CalcTagsECC(yaffs_Tags *tags) +{ + // Todo don't do anything yet. Need to calculate ecc + unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes; + unsigned i,j; + unsigned ecc = 0; + unsigned bit = 0; + + tags->ecc = 0; + + for(i = 0; i < 8; i++) + { + for(j = 1; j &0x7f; j<<=1) + { + bit++; + if(b[i] & j) + { + ecc ^= bit; + } + } + } + + tags->ecc = ecc; + + +} +static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr) +{ + yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr; + + yaffs_CalcTagsECC(tagsPtr); + + sparePtr->tagByte0 = tu->asBytes[0]; + sparePtr->tagByte1 = tu->asBytes[1]; + sparePtr->tagByte2 = tu->asBytes[2]; + sparePtr->tagByte3 = tu->asBytes[3]; + sparePtr->tagByte4 = tu->asBytes[4]; + sparePtr->tagByte5 = tu->asBytes[5]; + sparePtr->tagByte6 = tu->asBytes[6]; + sparePtr->tagByte7 = tu->asBytes[7]; +} + + + +int write_chunk(__u8 *data, __u32 objId, __u32 chunkId, __u32 nBytes) +{ + yaffs_Tags t; + yaffs_Spare s; + + error = write(outFile,data,512); + if(error < 0) return error; + + memset(&t,0xff,sizeof (yaffs_Tags)); + + t.chunkId = chunkId; + t.serialNumber = 0; + t.byteCount = nBytes; + t.objectId = objId; + + yaffs_CalcTagsECC(&t); + yaffs_LoadTagsIntoSpare(&s,&t); + yaffs_CalcECC(data,&s); + + nPages++; + + return write(outFile,&s,sizeof(yaffs_Spare)); + +} + +int write_object_header(int objId, yaffs_ObjectType t, struct stat *s, int parent, const char *name, int equivalentObj, const char * alias) +{ + __u8 bytes[512]; + + + yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)bytes; + + memset(bytes,0xff,512); + + oh->type = t; + + oh->parentObjectId = parent; + + strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH); + + if(t != YAFFS_OBJECT_TYPE_HARDLINK) + { + oh->st_mode = s->st_mode; + oh->st_uid = s->st_uid; + oh->st_gid = s->st_uid; + oh->st_atime = s->st_atime; + oh->st_mtime = s->st_mtime; + oh->st_ctime = s->st_ctime; + oh->st_rdev = s->st_rdev; + } + + if(t == YAFFS_OBJECT_TYPE_FILE) + { + oh->fileSize = s->st_size; + } + + if(t == YAFFS_OBJECT_TYPE_HARDLINK) + { + oh->equivalentObjectId = equivalentObj; + } + + if(t == YAFFS_OBJECT_TYPE_SYMLINK) + { + strncpy(oh->alias,alias,YAFFS_MAX_ALIAS_LENGTH); + } + + return write_chunk(bytes,objId,0,0xffff); + +} + + +int process_directory(int parent, const char *path) +{ + + DIR *dir; + struct dirent *entry; + + nDirectories++; + + dir = opendir(path); + + if(dir) + { + while((entry = readdir(dir)) != NULL) + { + + /* Ignore . and .. */ + if(strcmp(entry->d_name,".") && + strcmp(entry->d_name,"..")) + { + char full_name[500]; + struct stat stats; + int equivalentObj; + int newObj; + + sprintf(full_name,"%s/%s",path,entry->d_name); + + lstat(full_name,&stats); + + if(S_ISLNK(stats.st_mode) || + S_ISREG(stats.st_mode) || + S_ISDIR(stats.st_mode) || + S_ISFIFO(stats.st_mode) || + S_ISBLK(stats.st_mode) || + S_ISCHR(stats.st_mode) || + S_ISSOCK(stats.st_mode)) + { + + newObj = obj_id++; + nObjects++; + + printf("Object %d, %s is a ",newObj,full_name); + + /* We're going to create an object for it */ + if((equivalentObj = find_obj_in_list(stats.st_dev, stats.st_ino)) > 0) + { + /* we need to make a hard link */ + printf("hard link to object %d\n",equivalentObj); + error = write_object_header(newObj, YAFFS_OBJECT_TYPE_HARDLINK, &stats, parent, entry->d_name, equivalentObj, NULL); + } + else + { + + add_obj_to_list(stats.st_dev,stats.st_ino,newObj); + + if(S_ISLNK(stats.st_mode)) + { + + char symname[500]; + + memset(symname,0,500); + + readlink(full_name,symname,499); + + printf("symlink to \"%s\"\n",symname); + error = write_object_header(newObj, YAFFS_OBJECT_TYPE_SYMLINK, &stats, parent, entry->d_name, -1, symname); + + } + else if(S_ISREG(stats.st_mode)) + { + printf("file, "); + error = write_object_header(newObj, YAFFS_OBJECT_TYPE_FILE, &stats, parent, entry->d_name, -1, NULL); + + if(error >= 0) + { + int h; + __u8 bytes[512]; + int nBytes; + int chunk = 0; + + h = open(full_name,O_RDONLY); + if(h >= 0) + { + memset(bytes,0xff,512); + while((nBytes = read(h,bytes,512)) > 0) + { + chunk++; + write_chunk(bytes,newObj,chunk,nBytes); + memset(bytes,0xff,512); + } + if(nBytes < 0) + error = nBytes; + + printf("%d data chunks written\n",chunk); + } + else + { + perror("Error opening file"); + } + close(h); + + } + + } + else if(S_ISSOCK(stats.st_mode)) + { + printf("socket\n"); + error = write_object_header(newObj, YAFFS_OBJECT_TYPE_SPECIAL, &stats, parent, entry->d_name, -1, NULL); + } + else if(S_ISFIFO(stats.st_mode)) + { + printf("fifo\n"); + error = write_object_header(newObj, YAFFS_OBJECT_TYPE_SPECIAL, &stats, parent, entry->d_name, -1, NULL); + } + else if(S_ISCHR(stats.st_mode)) + { + printf("character device\n"); + error = write_object_header(newObj, YAFFS_OBJECT_TYPE_SPECIAL, &stats, parent, entry->d_name, -1, NULL); + } + else if(S_ISBLK(stats.st_mode)) + { + printf("block device\n"); + error = write_object_header(newObj, YAFFS_OBJECT_TYPE_SPECIAL, &stats, parent, entry->d_name, -1, NULL); + } + else if(S_ISDIR(stats.st_mode)) + { + printf("directory\n"); + error = write_object_header(newObj, YAFFS_OBJECT_TYPE_DIRECTORY, &stats, parent, entry->d_name, -1, NULL); + process_directory(1,full_name); + } + } + } + else + { + printf(" we don't handle this type\n"); + } + } + } + } + + return 0; + +} + + +int main(int argc, char *argv[]) +{ + struct stat stats; + + printf("mkyaffsimage: image building tool for YAFFS built "__DATE__"\n"); + + if(argc != 3) + { + printf("usage: mkyaffsimage dir image_file\n"); + printf(" dir the directory tree to be converted\n"); + printf(" image_file the ouput file to hold the image\n"); + exit(1); + } + + if(stat(argv[1],&stats) < 0) + { + printf("Could not stat %s\n",argv[1]); + exit(1); + } + + if(!S_ISDIR(stats.st_mode)) + { + printf(" %s is not a directory\n",argv[1]); + exit(1); + } + + outFile = open(argv[2],O_CREAT | O_TRUNC | O_WRONLY, S_IREAD | S_IWRITE); + + + if(outFile < 0) + { + printf("Could not open output file %s\n",argv[2]); + exit(1); + } + + printf("Processing directory %s into image file %s\n",argv[1],argv[2]); + + error = process_directory(YAFFS_OBJECTID_ROOT,argv[1]); + + close(outFile); + + if(error < 0) + { + perror("operation incomplete"); + exit(1); + } + else + { + printf("Operation complete.\n" + "%d objects in %d directories\n" + "%d NAND pages\n",nObjects, nDirectories, nPages); + } + + close(outFile); + + exit(0); +} + diff --git a/yaffs_fileem.c b/yaffs_fileem.c index a034610..dbbe5f8 100644 --- a/yaffs_fileem.c +++ b/yaffs_fileem.c @@ -26,7 +26,7 @@ #include #include -#define FILE_SIZE_IN_MEG 2 +#define FILE_SIZE_IN_MEG 32 #define BLOCK_SIZE (32 * 528) #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512)) @@ -37,6 +37,21 @@ static int h; static __u8 ffChunk[528]; +static int eraseDisplayEnabled; + +static int markedBadBlocks[] = { 1, 4, -1}; + +static int IsAMarkedBadBlock(int blk) +{ + int *m = markedBadBlocks; + + while(*m >= 0) + { + if(*m == blk) return 1; + m++; + } + return 0; +} static void CheckInit(yaffs_Device *dev) @@ -68,8 +83,18 @@ static void CheckInit(yaffs_Device *dev) for(i = 0; i < FILE_SIZE_IN_BLOCKS; i++) { yaffs_FEEraseBlockInNAND(dev,i); + + if(IsAMarkedBadBlock(i)) + { + yaffs_Spare spare; + memset(&spare,0xff,sizeof(spare)); + spare.blockStatus = 1; + + yaffs_FEWriteChunkToNAND(dev, i * 32,NULL,&spare); + } } } + eraseDisplayEnabled = 1; } } @@ -133,7 +158,10 @@ int yaffs_FEEraseBlockInNAND(yaffs_Device *dev,int blockInNAND) CheckInit(dev); - printf("Erasing block %d\n",blockInNAND); + if(eraseDisplayEnabled) + { + printf("Erasing block %d\n",blockInNAND); + } lseek(h,blockInNAND * BLOCK_SIZE,SEEK_SET); for(i = 0; i < 32; i++) diff --git a/yaffs_fs.c b/yaffs_fs.c index 6a2ddb3..1a9460e 100644 --- a/yaffs_fs.c +++ b/yaffs_fs.c @@ -238,7 +238,7 @@ static void yaffs_put_inode(struct inode *inode) static int yaffs_readpage(struct file *f, struct page * pg) { - struct yaffs_Object *obj; + yaffs_Object *obj; unsigned char *pg_buf; int ret; @@ -255,7 +255,7 @@ static int yaffs_readpage(struct file *f, struct page * pg) pg_buf = kmap(pg); /* FIXME: Can kmap fail? */ - ret = yaffs_ReadDataFromFile(obj,pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); + ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); if(ret >= 0) ret = 0; @@ -312,7 +312,7 @@ static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj) inode->i_gid = obj->st_gid; inode->i_blksize = YAFFS_BYTES_PER_CHUNK; inode->i_blocks = 0; - inode->i_rdev = NODEV; + inode->i_rdev = obj->st_rdev;; inode->i_atime = obj->st_atime; inode->i_mtime = obj->st_mtime; inode->i_ctime = obj->st_ctime; @@ -324,8 +324,8 @@ static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj) switch (obj->st_mode & S_IFMT) { - default: - // init_special_inode(inode, mode, dev); + default: // fifo, device or socket + init_special_inode(inode, obj->st_mode, obj->st_rdev); break; case S_IFREG: // file inode->i_op = &yaffs_file_inode_operations; @@ -526,13 +526,15 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int d return -EPERM; } - T(("yaffs_mknod: making oject for %s, mode %x\n", - dentry->d_name.name, mode)); + T(("yaffs_mknod: making oject for %s, mode %x dev %x\n", + dentry->d_name.name, mode,dev)); switch (mode & S_IFMT) { default: - + // Special (socket, fifo, device...) + T((KERN_DEBUG"yaffs_mknod: making special\n")); + obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,dev); break; case S_IFREG: // file T((KERN_DEBUG"yaffs_mknod: making file\n")); diff --git a/yaffs_guts.c b/yaffs_guts.c index 4c7e81a..caf9289 100644 --- a/yaffs_guts.c +++ b/yaffs_guts.c @@ -1,3298 +1,3540 @@ -/* - * YAFFS: Yet another FFS. A NAND-flash specific file system. - * yaffs_guts.c The main guts of YAFFS - * - * Copyright (C) 2002 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 General Public License version 2 as - * published by the Free Software Foundation. - * - */ - //yaffs_guts.c - -#include "yportenv.h" - -#include "yaffsinterface.h" -#include "yaffs_guts.h" - - -#if 0 -#define T(x) printf x -#else -#define T(x) -#endif - -// External functions for ECC on data -void nand_calculate_ecc (const u_char *dat, u_char *ecc_code); -int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc); - - -// countBits is a quick way of counting the number of bits in a byte. -// ie. countBits[n] holds the number of 1 bits in a byte with the value n. - -static const char yaffs_countBits[256] = -{ -0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4, -1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, -1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, -1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, -3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, -4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8 -}; - - - -// Device info -//static yaffs_Device *yaffs_device; -//yaffs_Object *yaffs_rootDir; -//yaffs_Object *yaffs_lostNFound; - - - -// Local prototypes -static int yaffs_CheckObjectHashSanity(yaffs_Device *dev); -static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr); -static void yaffs_GetTagsFromSpare(yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr); -static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan); - -static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type); -static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj); -static int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name); -static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId); -static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj); -static int yaffs_CheckStructures(void); - -loff_t yaffs_GetFileSize(yaffs_Object *obj); - - -static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve); - -#ifdef YAFFS_PARANOID -static int yaffs_CheckFileSanity(yaffs_Object *in); -#else -#define yaffs_CheckFileSanity(in) -#endif - -static int __inline__ yaffs_HashFunction(int n) -{ - return (n % YAFFS_NOBJECT_BUCKETS); -} - - -yaffs_Object *yaffs_Root(yaffs_Device *dev) -{ - return dev->rootDir; -} - -yaffs_Object *yaffs_LostNFound(yaffs_Device *dev) -{ - return dev->lostNFoundDir; -} - - -static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare) -{ - return dev->writeChunkToNAND(dev,chunkInNAND,data,spare); -} - -int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare) -{ - int retVal; - __u8 calcEcc[3]; - yaffs_Spare localSpare; - - if(!spare && data) - { - // If we don't have a real spare, then we use a local one. - // Need this for the calculation of the ecc - spare = &localSpare; - } - - retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,spare); - if(data) - { - // Do ECC correction - //Todo handle any errors - nand_calculate_ecc(data,calcEcc); - nand_correct_data (data,spare->ecc1, calcEcc); - nand_calculate_ecc(&data[256],calcEcc); - nand_correct_data (&data[256],spare->ecc2, calcEcc); - } - return retVal; -} - -#ifdef YAFFS_PARANOID - -static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND) -{ - static int init = 0; - static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK]; - static __u8 data[YAFFS_BYTES_PER_CHUNK]; - static __u8 spare[16]; - - int retVal; - - retVal = YAFFS_OK; - - dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare *)spare); - - - - if(!init) - { - memset(cmpbuf,0xff,YAFFS_BYTES_PER_CHUNK); - init = 1; - } - - if(memcmp(cmpbuf,data,YAFFS_BYTES_PER_CHUNK)) retVal = YAFFS_FAIL; - if(memcmp(cmpbuf,spare,16)) retVal = YAFFS_FAIL; - - return retVal; - -} - -#endif - - -int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND) -{ - return dev->eraseBlockInNAND(dev,blockInNAND); -} - -int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev) -{ - return dev->initialiseNAND(dev); -} - -static int yaffs_WriteNewChunkToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_Spare *spare,int useReserve) -{ - int chunk; - - int writeOk = 0; - - unsigned char rbData[YAFFS_BYTES_PER_CHUNK]; - yaffs_Spare rbSpare; - - do{ - chunk = yaffs_AllocateChunk(dev,useReserve); - - if(chunk >= 0) - { - writeOk = yaffs_WriteChunkToNAND(dev,chunk,data,spare); - if(writeOk) - { - // Readback & verify - // If verify fails, then delete this chunk and try again - // To verify we compare everything except the block and - // page status bytes. - yaffs_ReadChunkFromNAND(dev,chunk,rbData,&rbSpare); - - if(memcmp(data,rbData,YAFFS_BYTES_PER_CHUNK) != 0 || - spare->tagByte0 != rbSpare.tagByte0 || - spare->tagByte1 != rbSpare.tagByte1 || - spare->tagByte2 != rbSpare.tagByte2 || - spare->tagByte3 != rbSpare.tagByte3 || - spare->tagByte4 != rbSpare.tagByte4 || - spare->tagByte5 != rbSpare.tagByte5 || - spare->tagByte6 != rbSpare.tagByte6 || - spare->tagByte7 != rbSpare.tagByte7 || - spare->ecc1[0] != rbSpare.ecc1[0] || - spare->ecc1[1] != rbSpare.ecc1[1] || - spare->ecc1[2] != rbSpare.ecc1[2] || - spare->ecc2[0] != rbSpare.ecc2[0] || - spare->ecc2[1] != rbSpare.ecc2[1] || - spare->ecc2[2] != rbSpare.ecc2[2] ) - { - // Didn't verify - yaffs_DeleteChunk(dev,chunk); - writeOk = 0; - } - - } - } - } while(chunk >= 0 && ! writeOk); - - return chunk; -} - - - - -///////////////////////// Object management ////////////////// -// List of spare objects -// The list is hooked together using the first pointer -// in the object - -// static yaffs_Object *yaffs_freeObjects = NULL; - -// static int yaffs_nFreeObjects; - -// static yaffs_ObjectList *yaffs_allocatedObjectList = NULL; - -// static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS]; - - -static __u16 yaffs_CalcNameSum(const char *name) -{ - __u16 sum = 0; - __u16 i = 1; - - __u8 *bname = (__u8 *)name; - - while (*bname) - { - sum += (*bname) * i; - i++; - bname++; - } - return sum; -} - - -void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare) -{ - nand_calculate_ecc (data , spare->ecc1); - nand_calculate_ecc (&data[256] , spare->ecc2); -} - -void yaffs_CalcTagsECC(yaffs_Tags *tags) -{ - // Todo don't do anything yet. Need to calculate ecc - unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes; - unsigned i,j; - unsigned ecc = 0; - unsigned bit = 0; - - tags->ecc = 0; - - for(i = 0; i < 8; i++) - { - for(j = 1; j &0x7f; j<<=1) - { - bit++; - if(b[i] & j) - { - ecc ^= bit; - } - } - } - - tags->ecc = ecc; - - -} - -void yaffs_CheckECCOnTags(yaffs_Tags *tags) -{ - unsigned ecc = tags->ecc; - - yaffs_CalcTagsECC(tags); - - ecc ^= tags->ecc; - - if(ecc) - { - // Needs fixing - unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes; - - ecc--; - - b[ecc / 8] ^= (1 << (ecc & 7)); - - // Now recvalc the ecc - yaffs_CalcTagsECC(tags); - } -} - - -///////////////////////// TNODES /////////////////////// - -// List of spare tnodes -// The list is hooked together using the first pointer -// in the tnode. - -//static yaffs_Tnode *yaffs_freeTnodes = NULL; - -// static int yaffs_nFreeTnodes; - -//static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL; - - - -// yaffs_CreateTnodes creates a bunch more tnodes and -// adds them to the tnode free list. -// Don't use this function directly - -static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes) -{ - int i; - yaffs_Tnode *newTnodes; - yaffs_TnodeList *tnl; - - if(nTnodes < 1) return YAFFS_OK; - - // make these things - - newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode)); - - if (!newTnodes) - { - YALERT("Could not malloc tnodes"); - return YAFFS_FAIL; - } - - // Hook them into the free list - for(i = 0; i < nTnodes - 1; i++) - { - newTnodes[i].internal[0] = &newTnodes[i+1]; - } - - newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes; - dev->freeTnodes = newTnodes; - dev->nFreeTnodes+= nTnodes; - dev->nTnodesCreated += nTnodes; - - // Now add this bunch of tnodes to a list for freeing up. - - tnl = YMALLOC(sizeof(yaffs_TnodeList)); - if(!tnl) - { - YALERT("Could not add tnodes to management list"); - } - else - { - tnl->tnodes = newTnodes; - tnl->next = dev->allocatedTnodeList; - dev->allocatedTnodeList = tnl; - } - - - YINFO("Tnodes created"); - - - return YAFFS_OK; -} - - -// GetTnode gets us a clean tnode. Tries to make allocate more if we run out -static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev) -{ - yaffs_Tnode *tn = NULL; - - // If there are none left make more - if(!dev->freeTnodes) - { - yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES); - } - - if(dev->freeTnodes) - { - tn = dev->freeTnodes; - dev->freeTnodes = dev->freeTnodes->internal[0]; - dev->nFreeTnodes--; - // zero out - memset(tn,0,sizeof(yaffs_Tnode)); - } - - - return tn; -} - - -// FreeTnode frees up a tnode and puts it back on the free list -static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn) -{ - tn->internal[0] = dev->freeTnodes; - dev->freeTnodes = tn; - dev->nFreeTnodes++; -} - - -static void yaffs_DeinitialiseTnodes(yaffs_Device*dev) -{ - // Free the list of allocated tnodes - - while(dev->allocatedTnodeList) - { - YFREE(dev->allocatedTnodeList->tnodes); - dev->allocatedTnodeList = dev->allocatedTnodeList->next; - } - - dev->freeTnodes = NULL; - dev->nFreeTnodes = 0; -} - -static void yaffs_InitialiseTnodes(yaffs_Device*dev) -{ - dev->allocatedTnodeList = NULL; - dev->freeTnodes = NULL; - dev->nFreeTnodes = 0; - dev->nTnodesCreated = 0; - -} - -void yaffs_TnodeTest(yaffs_Device *dev) -{ - - int i; - int j; - yaffs_Tnode *tn[1000]; - - YINFO("Testing TNodes"); - - for(j = 0; j < 50; j++) - { - for(i = 0; i < 1000; i++) - { - tn[i] = yaffs_GetTnode(dev); - if(!tn[i]) - { - YALERT("Getting tnode failed"); - } - } - for(i = 0; i < 1000; i+=3) - { - yaffs_FreeTnode(dev,tn[i]); - tn[i] = NULL; - } - - } -} - -////////////////// END OF TNODE MANIPULATION /////////////////////////// - -/////////////// Functions to manipulate the look-up tree (made up of tnodes) -// The look up tree is represented by the top tnode and the number of topLevel -// in the tree. 0 means only the level 0 tnode is in the tree. - - -// FindLevel0Tnode finds the level 0 tnode, if one exists. -// Used when reading..... -static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId) -{ - - yaffs_Tnode *tn = fStruct->top; - __u32 i; - int requiredTallness; - int level = fStruct->topLevel; - - // Check sane level and chunk Id - if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL) - { - char str[50]; - sprintf(str,"Bad level %d",level); - YALERT(str); - return NULL; - } - if(chunkId > YAFFS_MAX_CHUNK_ID) - { - char str[50]; - sprintf(str,"Bad chunkId %d",chunkId); - YALERT(str); - return NULL; - } - - // First check we're tall enough (ie enough topLevel) - - i = chunkId >> (dev->chunkGroupBits + YAFFS_TNODES_LEVEL0_BITS); - requiredTallness = 0; - while(i) - { - i >>= YAFFS_TNODES_INTERNAL_BITS; - requiredTallness++; - } - - - if(requiredTallness > fStruct->topLevel) - { - // Not tall enough, so we can't find it, return NULL. - return NULL; - } - - - // Traverse down to level 0 - while (level > 0 && tn) - { - tn = tn->internal[(chunkId >>(dev->chunkGroupBits + YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) & - YAFFS_TNODES_INTERNAL_MASK]; - level--; - - } - - return tn; -} - -// AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree. -// This happens in two steps: -// 1. If the tree isn't tall enough, then make it taller. -// 2. Scan down the tree towards the level 0 tnode adding tnodes if required. -// -// Used when modifying the tree. -// -static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId) -{ - - yaffs_Tnode *tn; - - int requiredTallness; - - __u32 i; - __u32 l; - - - T(("AddOrFind topLevel=%d, chunk=%d",fStruct->topLevel,chunkId)); - - // Check sane level and page Id - if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) - { - char str[50]; - sprintf(str,"Bad level %d",fStruct->topLevel); - YALERT(str); - return NULL; - } - - if(chunkId > YAFFS_MAX_CHUNK_ID) - { - char str[50]; - sprintf(str,"Bad chunkId %d",chunkId); - YALERT(str); - return NULL; - } - - // First check we're tall enough (ie enough topLevel) - - i = chunkId >> (dev->chunkGroupBits + YAFFS_TNODES_LEVEL0_BITS); - requiredTallness = 0; - while(i) - { - i >>= YAFFS_TNODES_INTERNAL_BITS; - requiredTallness++; - } - - T((" required=%d",requiredTallness)); - - - if(requiredTallness > fStruct->topLevel) - { - // Not tall enough,gotta make the tree taller - for(i = fStruct->topLevel; i < requiredTallness; i++) - { - T((" add new top")); - - tn = yaffs_GetTnode(dev); - - if(tn) - { - tn->internal[0] = fStruct->top; - fStruct->top = tn; - } - else - { - YALERT("No more tnodes"); - } - } - - fStruct->topLevel = requiredTallness; - } - - - // Traverse down to level 0, adding anything we need - - l = fStruct->topLevel; - tn = fStruct->top; - while (l > 0 && tn) - { - i = (chunkId >> (dev->chunkGroupBits +YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) & - YAFFS_TNODES_INTERNAL_MASK; - - T((" [%d:%d]",l,i)); - - if(!tn->internal[i]) - { - T((" added")); - - tn->internal[i] = yaffs_GetTnode(dev); - } - - tn = tn->internal[i]; - l--; - - } - - T(("\n")); - - return tn; -} - - -// Pruning removes any part of the file structure tree that is beyond the -// bounds of the file. -// A file should only get pruned when its size is reduced. -// -// Before pruning, the chunks must be pulled from the tree and the -// level 0 tnode entries must be zeroed out. -// Could also use this for file deletion, but that's probably better handled -// by a special case. - -// yaffs_PruneWorker should only be called by yaffs_PruneFileStructure() - -static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0) -{ - int i; - int hasData; - - if(tn) - { - hasData = 0; - - for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++) - { - if(tn->internal[i] && level > 0) - { - tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1); - } - - if(tn->internal[i]) - { - hasData++; - } - } - - if(hasData == 0 && del0) - { - // Free and return NULL - - yaffs_FreeTnode(dev,tn); - tn = NULL; - } - - } - - return tn; - -} - -static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct) -{ - int i; - int hasData; - int done = 0; - yaffs_Tnode *tn; - - if(fStruct->topLevel > 0) - { - fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0); - - // Now we have a tree with all the non-zero branches NULL but the height - // is the same as it was. - // Let's see if we can trim internal tnodes to shorten the tree. - // We can do this if only the 0th element in the tnode is in use - // (ie all the non-zero are NULL) - - while(fStruct->topLevel && !done) - { - tn = fStruct->top; - - hasData = 0; - for(i = 1; i internal[i]) - { - hasData++; - } - } - - if(!hasData) - { - fStruct->top = tn->internal[0]; - fStruct->topLevel--; - yaffs_FreeTnode(dev,tn); - } - else - { - done = 1; - } - } - } - - return YAFFS_OK; -} - - - - -/////////////////////// End of File Structure functions. ///////////////// - -// yaffs_CreateFreeObjects creates a bunch more objects and -// adds them to the object free list. -static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects) -{ - int i; - yaffs_Object *newObjects; - yaffs_ObjectList *list; - - if(nObjects < 1) return YAFFS_OK; - - // make these things - - newObjects = YMALLOC(nObjects * sizeof(yaffs_Object)); - - if (!newObjects) - { - YALERT("Could not allocate more objects"); - return YAFFS_FAIL; - } - - // Hook them into the free list - for(i = 0; i < nObjects - 1; i++) - { - (yaffs_Object *)newObjects[i].siblings.next = &newObjects[i+1]; - } - - newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects; - dev->freeObjects = newObjects; - dev->nFreeObjects+= nObjects; - dev->nObjectsCreated+= nObjects; - - // Now add this bunch of Objects to a list for freeing up. - - list = YMALLOC(sizeof(yaffs_ObjectList)); - if(!list) - { - YALERT("Could not add Objects to management list"); - } - else - { - list->objects = newObjects; - list->next = dev->allocatedObjectList; - dev->allocatedObjectList = list; - } - - - YINFO("Objects created"); - - - return YAFFS_OK; -} - - -// AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out -static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev) -{ - yaffs_Object *tn = NULL; - - // If there are none left make more - if(!dev->freeObjects) - { - yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS); - } - - if(dev->freeObjects) - { - tn = dev->freeObjects; - dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next); - dev->nFreeObjects--; - - // Now sweeten it up... - - memset(tn,0,sizeof(yaffs_Object)); - tn->chunkId = -1; - tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN; - INIT_LIST_HEAD(&(tn->hardLinks)); - INIT_LIST_HEAD(&(tn->hashLink)); - INIT_LIST_HEAD(&tn->siblings); - - // Add it to the lost and found directory. - // NB Can't put root or lostNFound in lostNFound so - // check if lostNFound exists first - if(dev->lostNFoundDir) - { - yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn); - } - } - - - return tn; -} - -static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode) -{ - - yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY); - if(obj) - { - obj->fake = 1; // it is fake so it has no NAND presence... - obj->renameAllowed= 0; // ... and we're not allowed to rename it... - obj->unlinkAllowed= 0; // ... or unlink it - obj->st_mode = mode; - obj->myDev = dev; - obj->chunkId = 0; // Not a valid chunk. - } - - return obj; - -} - - -static void yaffs_UnhashObject(yaffs_Object *tn) -{ - int bucket; - yaffs_Device *dev = tn->myDev; - - - // If it is still linked into the bucket list, free from the list - if(!list_empty(&tn->hashLink)) - { - list_del_init(&tn->hashLink); - bucket = yaffs_HashFunction(tn->objectId); - dev->objectBucket[bucket].count--; - } - -} - - -// FreeObject frees up a Object and puts it back on the free list -static void yaffs_FreeObject(yaffs_Object *tn) -{ - - yaffs_Device *dev = tn->myDev; - - yaffs_UnhashObject(tn); - - // Link into the free list. - (yaffs_Object *)(tn->siblings.next) = dev->freeObjects; - dev->freeObjects = tn; - dev->nFreeObjects++; -} - - - - -static void yaffs_DeinitialiseObjects(yaffs_Device *dev) -{ - // Free the list of allocated Objects - - while( dev->allocatedObjectList) - { - YFREE(dev->allocatedObjectList->objects); - dev->allocatedObjectList = dev->allocatedObjectList->next; - } - - dev->freeObjects = NULL; - dev->nFreeObjects = 0; -} - -static void yaffs_InitialiseObjects(yaffs_Device *dev) -{ - int i; - - dev->allocatedObjectList = NULL; - dev->freeObjects = NULL; - dev->nFreeObjects = 0; - - for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) - { - INIT_LIST_HEAD(&dev->objectBucket[i].list); - dev->objectBucket[i].count = 0; - } - -} - - - - - - -int yaffs_FindNiceObjectBucket(yaffs_Device *dev) -{ - static int x = 0; - int i; - int l = 999; - int lowest = 999999; - - - // First let's see if we can find one that's empty. - - for(i = 0; i < 10 && lowest > 0; i++) - { - x++; - x %= YAFFS_NOBJECT_BUCKETS; - if(dev->objectBucket[x].count < lowest) - { - lowest = dev->objectBucket[x].count; - l = x; - } - - } - - // If we didn't find an empty list, then try - // looking a bit further for a short one - - for(i = 0; i < 10 && lowest > 3; i++) - { - x++; - x %= YAFFS_NOBJECT_BUCKETS; - if(dev->objectBucket[x].count < lowest) - { - lowest = dev->objectBucket[x].count; - l = x; - } - - } - - return l; -} - -static int yaffs_CreateNewObjectNumber(yaffs_Device *dev) -{ - int bucket = yaffs_FindNiceObjectBucket(dev); - - // Now find an object value that has not already been taken - // by scanning the list. - - int found = 0; - struct list_head *i; - - int n = bucket; - - //yaffs_CheckObjectHashSanity(); - - while(!found) - { - found = 1; - n += YAFFS_NOBJECT_BUCKETS; - if(1 ||dev->objectBucket[bucket].count > 0) - { - list_for_each(i,&dev->objectBucket[bucket].list) - { - // If there is already one in the list - if(list_entry(i, yaffs_Object,hashLink)->objectId == n) - { - found = 0; - } - } - } - } - - //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n); - - return n; -} - -void yaffs_HashObject(yaffs_Object *in) -{ - int bucket = yaffs_HashFunction(in->objectId); - yaffs_Device *dev = in->myDev; - - if(!list_empty(&in->hashLink)) - { - YINFO("!!!"); - } - - - list_add(&in->hashLink,&dev->objectBucket[bucket].list); - dev->objectBucket[bucket].count++; - -} - -yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,int number) -{ - int bucket = yaffs_HashFunction(number); - struct list_head *i; - yaffs_Object *in; - - list_for_each(i,&dev->objectBucket[bucket].list) - { - // Lookm if it is in the list - in = list_entry(i, yaffs_Object,hashLink); - if(in->objectId == number) - { - return in; - } - } - - return NULL; -} - - - -yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type) -{ - - yaffs_Object *theObject; - - if(number < 0) - { - number = yaffs_CreateNewObjectNumber(dev); - } - - theObject = yaffs_AllocateEmptyObject(dev); - - if(theObject) - { - theObject->fake = 0; - theObject->renameAllowed = 1; - theObject->unlinkAllowed = 1; - theObject->objectId = number; - theObject->myDev = dev; - yaffs_HashObject(theObject); - theObject->variantType = type; - theObject->st_atime = theObject->st_mtime = theObject->st_ctime = CURRENT_TIME; - - switch(type) - { - case YAFFS_OBJECT_TYPE_FILE: - theObject->variant.fileVariant.fileSize = 0; - theObject->variant.fileVariant.topLevel = 0; - theObject->variant.fileVariant.top = yaffs_GetTnode(dev); - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - INIT_LIST_HEAD(&theObject->variant.directoryVariant.children); - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - // No action required - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - // No action required - break; - case YAFFS_OBJECT_TYPE_UNKNOWN: - // todo this should not happen - } - } - - return theObject; -} - -yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type) -{ - yaffs_Object *theObject = NULL; - - if(number >= 0) - { - theObject = yaffs_FindObjectByNumber(dev,number); - } - - if(!theObject) - { - theObject = yaffs_CreateNewObject(dev,number,type); - } - - return theObject; - -} - -char *yaffs_CloneString(const char *str) -{ - char *newStr = NULL; - - if(str && *str) - { - newStr = YMALLOC(strlen(str) + 1); - strcpy(newStr,str); - } - - return newStr; - -} - -// -// Mknod (create) a new object. -// equivalentObject only has meaning for a hard link; -// aliasString only has meaning for a sumlink. -yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type, - yaffs_Object *parent, - const char *name, - __u32 mode, - __u32 uid, - __u32 gid, - yaffs_Object *equivalentObject, - const char *aliasString) -{ - yaffs_Object *in; - - yaffs_Device *dev = parent->myDev; - - // Check if the entry exists. If it does then fail the call since we don't want a dup. - if(yaffs_FindObjectByName(parent,name)) - { - return NULL; - } - - in = yaffs_CreateNewObject(dev,-1,type); - - if(in) - { - in->chunkId = -1; - in->valid = 1; - in->variantType = type; - - in->st_mode = mode; - in->st_uid = uid; - in->st_gid = gid; - in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME; - - in->sum = yaffs_CalcNameSum(name); - in->dirty = 1; - - yaffs_AddObjectToDirectory(parent,in); - - in->myDev = parent->myDev; - - - switch(type) - { - case YAFFS_OBJECT_TYPE_SYMLINK: - in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString); - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - in->variant.hardLinkVariant.equivalentObject = equivalentObject; - in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId; - list_add(&in->hardLinks,&equivalentObject->hardLinks); - break; - case YAFFS_OBJECT_TYPE_FILE: // do nothing - case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing - case YAFFS_OBJECT_TYPE_UNKNOWN: - } - - yaffs_UpdateObjectHeader(in,name); - - } - - return in; -} - -yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL); -} - -yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL); -} - -yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,const char *alias) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias); -} - -// NB yaffs_Link returns the object id of the equivalent object. -yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject) -{ - // Get the real object in case we were fed a hard link as an equivalent object - equivalentObject = yaffs_GetEquivalentObject(equivalentObject); - - if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL)) - { - return equivalentObject; - } - else - { - return NULL; - } - -} - - -static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const char *newName) -{ - //yaffs_Device *dev = obj->myDev; - - if(newDir == NULL) - { - newDir = obj->parent; // use the old directory - } - - // Only proceed if the new name does not exist and - // if we're putting it into a directory. - if(!yaffs_FindObjectByName(newDir,newName) && - newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) - { - obj->sum = yaffs_CalcNameSum(newName); - obj->dirty = 1; - yaffs_AddObjectToDirectory(newDir,obj); - - if(yaffs_UpdateObjectHeader(obj,newName) >= 0) - { - return YAFFS_OK; - } - } - - return YAFFS_FAIL; -} - -int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName) -{ - yaffs_Object *obj; - - obj = yaffs_FindObjectByName(oldDir,oldName); - if(obj && obj->renameAllowed) - { - return yaffs_ChangeObjectName(obj,newDir,newName); - } - return YAFFS_FAIL; -} - - - -static int yaffs_CheckObjectHashSanity(yaffs_Device *dev) -{ - // Scan the buckets and check that the lists - // have as many members as the count says there are - int bucket; - int countEm; - struct list_head *j; - int ok = YAFFS_OK; - - for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++) - { - countEm = 0; - - list_for_each(j,&dev->objectBucket[bucket].list) - { - countEm++; - } - - if(countEm != dev->objectBucket[bucket].count) - { - YALERT("Inode hash inconsistency"); - ok = YAFFS_FAIL; - } - } - - return ok; -} - -void yaffs_ObjectTest(yaffs_Device *dev) -{ - yaffs_Object *in[1000]; - int inNo[1000]; - yaffs_Object *inold[1000]; - int i; - int j; - - memset(in,0,1000*sizeof(yaffs_Object *)); - memset(inold,0,1000*sizeof(yaffs_Object *)); - - yaffs_CheckObjectHashSanity(dev); - - for(j = 0; j < 10; j++) - { - T(("%d\n",j)); - - for(i = 0; i < 1000; i++) - { - in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE); - if(!in[i]) - { - YINFO("No more inodes"); - } - else - { - inNo[i] = in[i]->objectId; - } - } - - for(i = 0; i < 1000; i++) - { - if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i]) - { - T(("Differnce in look up test\n")); - } - else - { - // T(("Look up ok\n")); - } - } - - yaffs_CheckObjectHashSanity(dev); - - for(i = 0; i < 1000; i+=3) - { - yaffs_FreeObject(in[i]); - in[i] = NULL; - } - - - yaffs_CheckObjectHashSanity(dev); - } - -} - - - -/////////////////////////// Block Management and Page Allocation /////////////////// - - -static void yaffs_InitialiseBlocks(yaffs_Device *dev) -{ - dev->blockInfo = YMALLOC(dev->nBlocks * sizeof(yaffs_BlockInfo)); - memset(dev->blockInfo,0,dev->nBlocks * sizeof(yaffs_BlockInfo)); - dev->allocationBlock = -1; // force it to get a new one -} - -static void yaffs_DeinitialiseBlocks(yaffs_Device *dev) -{ - YFREE(dev->blockInfo); -} - -// FindDiretiestBlock is used to select the dirtiest block (or close enough) -// for garbage collection. - -static int yaffs_FindDirtiestBlock(yaffs_Device *dev) -{ - - int b = dev->currentDirtyChecker; - - int i; - int dirtiest = -1; - int pagesInUse = 100; // silly big number - - for(i = dev->startBlock; i <= dev->endBlock && pagesInUse > 2 ; i++) - { - b++; - if (b > dev->endBlock) - { - b = dev->startBlock; - } - - if(dev->blockInfo[b].blockState == YAFFS_BLOCK_STATE_FULL && - (dev->blockInfo)[b].pagesInUse < pagesInUse) - { - dirtiest = b; - pagesInUse = (dev->blockInfo)[b].pagesInUse; - } - } - - dev->currentDirtyChecker = b; - - return dirtiest; -} - - -static int yaffs_FindBlockForAllocation(yaffs_Device *dev,int useReserve) -{ - int i; - - if(useReserve && dev->nErasedBlocks < 1) - { - // Hoosterman we've got a problem. - // Can't get space to gc - return -1; - } - else if(!useReserve && dev->nErasedBlocks <= YAFFS_RESERVED_BLOCKS) - { - // We are not in GC, so we hold some in reserve so we can get - // a gc done. - } - - // Find an empty block. - - for(i = dev->startBlock; i <= dev->endBlock; i++) - { - - if(dev->blockInfo[i].blockState == YAFFS_BLOCK_STATE_EMPTY) - { - dev->blockInfo[i].blockState = YAFFS_BLOCK_STATE_ALLOCATING; - dev->nErasedBlocks--; - if(dev->nErasedBlocks <= YAFFS_RESERVED_BLOCKS) - { - dev->garbageCollectionRequired = 1; - } - - return i; - } - } - - return -1; -} - - -static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo) -{ - yaffs_BlockInfo *bi = &dev->blockInfo[blockNo]; - - // Mark as dirty, erase it and mark as clean. - bi->blockState = YAFFS_BLOCK_STATE_DIRTY; - yaffs_EraseBlockInNAND(dev,blockNo); - bi->blockState = YAFFS_BLOCK_STATE_EMPTY; - dev->nErasedBlocks++; - bi->pagesInUse = 0; - bi->pageBits = 0; - - T(("Erased block %d\n",blockNo)); -} - - -static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve) -{ - int retVal; - - if(dev->allocationBlock < 0) - { - // Get next block to allocate off - dev->allocationBlock = yaffs_FindBlockForAllocation(dev,useReserve); - dev->allocationPage = 0; - } - - // Next page please.... - if(dev->allocationBlock >= 0) - { - retVal = (dev->allocationBlock * YAFFS_CHUNKS_PER_BLOCK) + - dev->allocationPage; - dev->blockInfo[dev->allocationBlock].pagesInUse++; - dev->blockInfo[dev->allocationBlock].pageBits |= - (1 << (dev->allocationPage)); - - dev->allocationPage++; - - dev->nFreeChunks--; - - // If the block is full set the state to full - if(dev->allocationPage >= YAFFS_CHUNKS_PER_BLOCK) - { - dev->blockInfo[dev->allocationBlock].blockState = YAFFS_BLOCK_STATE_FULL; - dev->allocationBlock = -1; - } - -#ifdef YAFFS_PARANOID - if(yaffs_CheckChunkErased(dev,retVal) == YAFFS_FAIL) - { - T(("..................Trying to allocate non-erased page %d\n",retVal)); - } -#endif - return retVal; - - } - T(("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!\n")); - - return -1; -} - - -int yaffs_GarbageCollectBlock(yaffs_Device *dev,int block) -{ - int oldChunk; - int newChunk; - __u32 mask; - - - yaffs_Spare spare; - yaffs_Tags tags; - __u8 buffer[YAFFS_BYTES_PER_CHUNK]; - - yaffs_BlockInfo *bi = &dev->blockInfo[block]; - - yaffs_Object *object; - - T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits)); - - for(mask = 1,oldChunk = block * YAFFS_CHUNKS_PER_BLOCK; - mask && bi->pageBits; - mask <<= 1, oldChunk++ ) - { - if(bi->pageBits & mask) - { - - // This page is in use and needs to be copied off - - T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk)); - - yaffs_ReadChunkFromNAND(dev,oldChunk,buffer, &spare); - - yaffs_GetTagsFromSpare(&spare,&tags); - tags.serialNumber++; - yaffs_LoadTagsIntoSpare(&spare,&tags); - -#if 0 - newChunk = yaffs_AllocatePage(dev,1); - if(newChunk < 0) - { - return YAFFS_FAIL; - } - - yaffs_WriteChunkToNAND(dev,newChunk, buffer, &spare); - -#else - newChunk = yaffs_WriteNewChunkToNAND(dev, buffer, &spare,1); -#endif - if(newChunk < 0) - { - return YAFFS_FAIL; - } - - object = yaffs_FindObjectByNumber(dev,tags.objectId); - - // Ok, now fix up the Tnodes etc. - - if(tags.chunkId == 0) - { - // It's a header - object->chunkId = newChunk; - } - else - { - // It's a data chunk - yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0); - - } - - yaffs_DeleteChunk(dev,oldChunk); - - } - } - - return YAFFS_OK; -} - -int yaffs_CheckGarbageCollection(yaffs_Device *dev) -{ - int block; - - if(dev->garbageCollectionRequired) - { - dev->garbageCollectionRequired = 0; - block = yaffs_FindDirtiestBlock(dev); - if(block >= 0) - { - return yaffs_GarbageCollectBlock(dev,block); - } - else - { - return YAFFS_FAIL; - } - } - - return YAFFS_OK; -} - - -//////////////////////////// TAGS /////////////////////////////////////// - -static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr) -{ - yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr; - - yaffs_CalcTagsECC(tagsPtr); - - sparePtr->tagByte0 = tu->asBytes[0]; - sparePtr->tagByte1 = tu->asBytes[1]; - sparePtr->tagByte2 = tu->asBytes[2]; - sparePtr->tagByte3 = tu->asBytes[3]; - sparePtr->tagByte4 = tu->asBytes[4]; - sparePtr->tagByte5 = tu->asBytes[5]; - sparePtr->tagByte6 = tu->asBytes[6]; - sparePtr->tagByte7 = tu->asBytes[7]; -} - -static void yaffs_GetTagsFromSpare(yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr) -{ - yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr; - - tu->asBytes[0]= sparePtr->tagByte0; - tu->asBytes[1]= sparePtr->tagByte1; - tu->asBytes[2]= sparePtr->tagByte2; - tu->asBytes[3]= sparePtr->tagByte3; - tu->asBytes[4]= sparePtr->tagByte4; - tu->asBytes[5]= sparePtr->tagByte5; - tu->asBytes[6]= sparePtr->tagByte6; - tu->asBytes[7]= sparePtr->tagByte7; - - yaffs_CheckECCOnTags(tagsPtr); -} - -static void yaffs_SpareInitialise(yaffs_Spare *spare) -{ - memset(spare,0xFF,sizeof(yaffs_Spare)); -} - -static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags) -{ - if(tags) - { - yaffs_Spare spare; - if(yaffs_ReadChunkFromNAND(dev,chunkInNAND,NULL,&spare) == YAFFS_OK) - { - yaffs_GetTagsFromSpare(&spare,tags); - return YAFFS_OK; - } - else - { - return YAFFS_FAIL; - } - } - - return YAFFS_OK; -} - -#if 0 -static int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_Tags *tags) -{ - // NB There must be tags, data is optional - // If there is data, then an ECC is calculated on it. - - yaffs_Spare spare; - - if(!tags) - { - return YAFFS_FAIL; - } - - yaffs_SpareInitialise(&spare); - - - if(buffer) - { - yaffs_CalcECC(buffer,&spare); - } - - yaffs_LoadTagsIntoSpare(&spare,tags); - - return yaffs_WriteChunkToNAND(dev,chunkInNAND,buffer,&spare); - -} -#endif - - -static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_Tags *tags, int useReserve) -{ - // NB There must be tags, data is optional - // If there is data, then an ECC is calculated on it. - - yaffs_Spare spare; - - if(!tags) - { - return YAFFS_FAIL; - } - - yaffs_SpareInitialise(&spare); - - - if(buffer) - { - yaffs_CalcECC(buffer,&spare); - } - - yaffs_LoadTagsIntoSpare(&spare,tags); - - return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve); - -} - - - - -int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags) -{ - //Get the Tnode, then get the level 0 offset chunk offset - yaffs_Tnode *tn; - int theChunk = -1; - yaffs_Tags localTags; - int i; - int found = 0; - yaffs_Device *dev = in->myDev; - - - if(!tags) - { - // Passed a NULL, so use our own tags space - tags = &localTags; - } - - tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); - - if(tn) - { - theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits; - - // Now we need to do the shifting etc and search for it - for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++) - { - yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags); - if(tags->chunkId == chunkInInode && - tags->objectId == in->objectId) - { - // found it; - found = 1; - } - else - { - theChunk++; - } - } - } - return found ? theChunk : -1; -} - -int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags) -{ - //Get the Tnode, then get the level 0 offset chunk offset - yaffs_Tnode *tn; - int theChunk = -1; - yaffs_Tags localTags; - int i; - int found = 0; - yaffs_Device *dev = in->myDev; - - if(!tags) - { - // Passed a NULL, so use our own tags space - tags = &localTags; - } - - tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); - - if(tn) - { - - theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits; - - // Now we need to do the shifting etc and search for it - for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++) - { - yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags); - if(tags->chunkId == chunkInInode && - tags->objectId == in->objectId) - { - // found it; - found = 1; - } - else - { - theChunk++; - } - } - - // Delete the entry in the filestructure - if(found) - { - tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0; - } - } - else - { - T(("No level 0 found for %d\n", chunkInInode)); - } - - if(!found) - { - T(("Could not find %d to delete\n",chunkInInode)); - } - return found ? theChunk : -1; -} - - -#if YAFFS_PARANOID - -static int yaffs_CheckFileSanity(yaffs_Object *in) -{ - int chunk; - int nChunks; - int fSize; - int failed = 0; - int objId; - yaffs_Tnode *tn; - yaffs_Tags localTags; - yaffs_Tags *tags = &localTags; - int theChunk; - - - if(in->variantType != YAFFS_OBJECT_TYPE_FILE) - { - T(("Object not a file\n")); - return YAFFS_FAIL; - } - - objId = in->objectId; - fSize = in->variant.fileVariant.fileSize; - nChunks = (fSize + YAFFS_BYTES_PER_CHUNK -1)/YAFFS_BYTES_PER_CHUNK; - - for(chunk = 1; chunk <= nChunks; chunk++) - { - tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk); - - if(tn) - { - - theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits; - - - yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags); - if(tags->chunkId == chunk && - tags->objectId == in->objectId) - { - // found it; - - } - else - { - //T(("File problem file [%d,%d] NAND %d tags[%d,%d]\n", - // objId,chunk,theChunk,tags->chunkId,tags->objectId); - - failed = 1; - - } - - } - else - { - T(("No level 0 found for %d\n", chunk)); - } - } - - return failed ? YAFFS_FAIL : YAFFS_OK; -} - -#endif - -static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan) -{ - yaffs_Tnode *tn; - yaffs_Device *dev = in->myDev; - int existingChunk; - yaffs_Tags existingTags; - yaffs_Tags newTags; - unsigned existingSerial, newSerial; - - - tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); - - if(inScan) - { - // If we're scanning then we need to test for duplicates - // NB This does not need to be efficient since it should only ever - // happen when the power fails during a write, then only one - // chunk should ever be affected. - - existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK]; - - if(existingChunk != 0) - { - // We have a duplicate now we need to decide which one to use - // To do this we get both sets of tags and compare serial numbers. - yaffs_ReadChunkTagsFromNAND(dev,chunkInInode, &newTags); - yaffs_ReadChunkTagsFromNAND(dev,existingChunk, &existingTags); - newSerial = newTags.serialNumber; - existingSerial = existingTags.serialNumber; - if(((existingSerial+1) & 3) == newSerial) - { - // Use new - // Delete the old one and drop through to update the tnode - yaffs_DeleteChunk(dev,existingChunk); - } - else - { - // Use existing. - // Delete the new one and return early so that the tnode isn't changed - yaffs_DeleteChunk(dev,chunkInInode); - return YAFFS_OK; - } - } - } - - tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = chunkInNAND; - - return YAFFS_OK; -} - - - -int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer) -{ - int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL); - - if(chunkInNAND >= 0) - { - return yaffs_ReadChunkFromNAND(in->myDev,chunkInNAND,buffer,NULL); - } - else - { - return 0; - } - -} - - -static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId) -{ - int block = chunkId / YAFFS_CHUNKS_PER_BLOCK; - int page = chunkId % YAFFS_CHUNKS_PER_BLOCK; - yaffs_Spare spare; - - yaffs_SpareInitialise(&spare); - - spare.pageStatus = 0; // To mark it as deleted. - - - yaffs_WriteChunkToNAND(dev,chunkId,NULL,&spare); - - - // Pull out of the management area. - // If the whole block became dirty, this will kick off an erasure. - if( dev->blockInfo[block].blockState == YAFFS_BLOCK_STATE_ALLOCATING || - dev->blockInfo[block].blockState == YAFFS_BLOCK_STATE_FULL) - { - dev->nFreeChunks++; - - dev->blockInfo[block].pageBits &= ~(1 << page); - dev->blockInfo[block].pagesInUse--; - - if( dev->blockInfo[block].pagesInUse == 0 && - dev->blockInfo[block].blockState == YAFFS_BLOCK_STATE_FULL) - { - yaffs_BlockBecameDirty(dev,block); - } - - } - else - { - T(("Bad news deleting chunk %d\n",chunkId)); - } - -} - - - - -int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve) -{ - // Find old chunk Need to do this to get serial number - // Write new one and patch into tree. - // Invalidate old tags. - - int prevChunkId; - yaffs_Tags prevTags; - - int newChunkId; - yaffs_Tags newTags; - - yaffs_Device *dev = in->myDev; - - yaffs_CheckGarbageCollection(dev); - - // Get the previous chunk at this location in the file if it exists - prevChunkId = yaffs_FindChunkInFile(in,chunkInInode,&prevTags); - - // Set up new tags - newTags.chunkId = chunkInInode; - newTags.objectId = in->objectId; - newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1; - newTags.byteCount = nBytes; - newTags.unusedStuff = 0xFFFFFFFF; - - yaffs_CalcTagsECC(&newTags); - - - #if 0 - // Create new chunk in NAND - newChunkId = yaffs_AllocatePage(dev,useReserve); - - - if(newChunkId >= 0) - { - - - yaffs_WriteChunkWithTagsToNAND(dev,newChunkId,buffer,&newTags); - - yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId); - - - if(prevChunkId >= 0) - { - yaffs_DeleteChunk(dev,prevChunkId); - - } - - yaffs_CheckFileSanity(in); - - return newChunkId; - } - - - return -1; -#else - - newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve); - if(newChunkId >= 0) - { - yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0); - - - if(prevChunkId >= 0) - { - yaffs_DeleteChunk(dev,prevChunkId); - - } - - yaffs_CheckFileSanity(in); - } - return newChunkId; - -#endif - - - -} - - -// UpdateObjectHeader updates the header on NAND for an object. -// If name is not NULL, then that new name is used. -// -int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name) -{ - - yaffs_Device *dev = in->myDev; - - int prevChunkId; - - int newChunkId; - yaffs_Tags newTags; - __u8 bufferNew[YAFFS_BYTES_PER_CHUNK]; - __u8 bufferOld[YAFFS_BYTES_PER_CHUNK]; - - yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)bufferNew; - yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld; - - if(!in->fake) - { - - yaffs_CheckGarbageCollection(dev); - - memset(bufferNew,0xFF,YAFFS_BYTES_PER_CHUNK); - - prevChunkId = in->chunkId; - - if(prevChunkId >= 0) - { - yaffs_ReadChunkFromNAND(dev,prevChunkId,bufferOld,NULL); - } - - // Header data - oh->type = in->variantType; - - oh->st_mode = in->st_mode; - oh->st_uid = in->st_uid; - oh->st_gid = in->st_gid; - oh->st_atime = in->st_atime; - oh->st_mtime = in->st_mtime; - oh->st_ctime = in->st_ctime; - - oh->parentObjectId = in->parent->objectId; - oh->sum = in->sum; - if(name && *name) - { - memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1); - strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH); - } - else - { - memcpy(oh->name, ohOld->name,YAFFS_MAX_NAME_LENGTH + 1); - } - - switch(in->variantType) - { - case YAFFS_OBJECT_TYPE_UNKNOWN: - // Should not happen - break; - case YAFFS_OBJECT_TYPE_FILE: - oh->fileSize = in->variant.fileVariant.fileSize; - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId; - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - // Do nothing - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH); - oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; - break; - } - - // Tags - in->serial++; - newTags.chunkId = 0; - newTags.objectId = in->objectId; - newTags.serialNumber = in->serial; - newTags.byteCount = 0xFFFFFFFF; - newTags.unusedStuff = 0xFFFFFFFF; - - yaffs_CalcTagsECC(&newTags); - - - -#if 0 - // Create new chunk in NAND - newChunkId = yaffs_AllocatePage(dev,1); - - if(newChunkId >= 0) - { - - yaffs_WriteChunkWithTagsToNAND(dev,newChunkId,bufferNew,&newTags); - - in->chunkId = newChunkId; - - if(prevChunkId >= 0) - { - yaffs_DeleteChunk(dev,prevChunkId); - } - - in->dirty = 0; - return newChunkId; - } - - return -1; -#else - // Create new chunk in NAND - newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,bufferNew,&newTags,1); - - if(newChunkId >= 0) - { - - in->chunkId = newChunkId; - - if(prevChunkId >= 0) - { - yaffs_DeleteChunk(dev,prevChunkId); - } - - in->dirty = 0; - } - - return newChunkId; - -#endif - } - return 0; -} - - - -///////////////////////// File read/write /////////////////////////////// -// Read and write have very similar structures. -// In general the read/write has three parts to it -// * An incomplete chunk to start with (if the read/write is not chunk-aligned) -// * Some complete chunks -// * An incomplete chunk to end off with -// -// Curve-balls: the first chunk might also be the last chunk. - -int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes) -{ - -// yaffs_Device *dev = in->myDev; - - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - - int chunk; - int start; - int nToCopy; - int n = nBytes; - int nDone = 0; - - while(n > 0) - { - chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; // The first chunk is 1 - start = offset % YAFFS_BYTES_PER_CHUNK; - - // OK now check for the curveball where the start and end are in - // the same chunk. - if( (start + n) < YAFFS_BYTES_PER_CHUNK) - { - nToCopy = n; - } - else - { - nToCopy = YAFFS_BYTES_PER_CHUNK - start; - } - - if(nToCopy != YAFFS_BYTES_PER_CHUNK) - { - // An incomplete start or end chunk (or maybe both start and end chunk) - // Read into the local buffer then copy... - - yaffs_ReadChunkDataFromObject(in,chunk,localBuffer); - memcpy(buffer,&localBuffer[start],nToCopy); - } - else - { - // A full chunk. Read directly into the supplied buffer. - yaffs_ReadChunkDataFromObject(in,chunk,buffer); - } - - n -= nToCopy; - offset += nToCopy; - buffer += nToCopy; - nDone += nToCopy; - - } - - return nDone; -} - - -int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes) -{ - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - - int chunk; - int start; - int nToCopy; - int n = nBytes; - int nDone = 0; - int nToWriteBack; - int endOfWrite = offset+nBytes; - int chunkWritten = 0; - - while(n > 0 && chunkWritten >= 0) - { - chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; - start = offset % YAFFS_BYTES_PER_CHUNK; - - - // OK now check for the curveball where the start and end are in - // the same chunk. - if( (start + n) < YAFFS_BYTES_PER_CHUNK) - { - nToCopy = n; - nToWriteBack = (start + n); - } - else - { - nToCopy = YAFFS_BYTES_PER_CHUNK - start; - nToWriteBack = YAFFS_BYTES_PER_CHUNK; - } - - if(nToCopy != YAFFS_BYTES_PER_CHUNK) - { - // An incomplete start or end chunk (or maybe both start and end chunk) - // Read into the local buffer then copy, then copy over and write back. - - yaffs_ReadChunkDataFromObject(in,chunk,localBuffer); - - memcpy(&localBuffer[start],buffer,nToCopy); - - chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,nToWriteBack,0); - - T(("Write with readback to chunk %d %d\n",chunk,chunkWritten)); - - } - else - { - // A full chunk. Write directly from the supplied buffer. - chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,YAFFS_BYTES_PER_CHUNK,0); - T(("Write to chunk %d %d\n",chunk,chunkWritten)); - } - - if(chunkWritten >= 0) - { - n -= nToCopy; - offset += nToCopy; - buffer += nToCopy; - nDone += nToCopy; - } - - } - - // Update file object - - if(endOfWrite > in->variant.fileVariant.fileSize) - { - in->variant.fileVariant.fileSize = endOfWrite; - } - - in->dirty = 1; - in->st_mtime = CURRENT_TIME; - - return nDone; -} - - -int yaffs_ResizeFile(yaffs_Object *in, int newSize) -{ - int i; - int chunkId; - int oldFileSize = in->variant.fileVariant.fileSize; - int sizeOfLastChunk = newSize % YAFFS_BYTES_PER_CHUNK; - - yaffs_Device *dev = in->myDev; - - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - - if(in->variantType != YAFFS_OBJECT_TYPE_FILE) - { - return yaffs_GetFileSize(in); - } - - if(newSize < oldFileSize) - { - - int lastDel = 1 + oldFileSize/YAFFS_BYTES_PER_CHUNK; - - int startDel = 1 + (newSize + YAFFS_BYTES_PER_CHUNK - 1)/ - YAFFS_BYTES_PER_CHUNK; - - for(i = startDel; i <= lastDel; i++) - { - // NB this could be optimised somewhat, - // eg. could retrieve the tags and write them without - // using yaffs_DeleteChunk - chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL); - if(chunkId < 0 || chunkId >= (dev->endBlock * 32)) - { - T(("Found daft chunkId %d for %d\n",chunkId,i)); - } - else - { - yaffs_DeleteChunk(dev,chunkId); - } - } - - - if(sizeOfLastChunk != 0) - { - int lastChunk = 1+ newSize/YAFFS_BYTES_PER_CHUNK; - - // Got to read and rewrite the last chunk with its new size. - yaffs_ReadChunkDataFromObject(in,lastChunk,localBuffer); - - yaffs_WriteChunkDataToObject(in,lastChunk,localBuffer,sizeOfLastChunk,1); - - } - - in->variant.fileVariant.fileSize = newSize; - - yaffs_PruneFileStructure(dev,&in->variant.fileVariant); - - return newSize; - - } - else - { - return oldFileSize; - } -} - - -loff_t yaffs_GetFileSize(yaffs_Object *obj) -{ - obj = yaffs_GetEquivalentObject(obj); - - switch(obj->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: - return obj->variant.fileVariant.fileSize; - case YAFFS_OBJECT_TYPE_SYMLINK: - return strlen(obj->variant.symLinkVariant.alias); - default: - return 0; - } -} - - - -// yaffs_FlushFile() updates the file's -// objectId in NAND - -int yaffs_FlushFile(yaffs_Object *in) -{ - int retVal; - if(in->dirty) - { - T(("flushing object header\n")); - retVal = yaffs_UpdateObjectHeader(in,NULL); - } - else - { - retVal = YAFFS_OK; - } - - return retVal; - -} - - -static int yaffs_DoGenericObjectDeletion(yaffs_Object *in) -{ - yaffs_RemoveObjectFromDirectory(in); - yaffs_DeleteChunk(in->myDev,in->chunkId); - yaffs_FreeObject(in); - return YAFFS_OK; - -} - -// yaffs_DeleteFile deletes the whole file data -// and the inode associated with the file. -// It does not delete the links associated with the file. -static int yaffs_DeleteFile(yaffs_Object *in) -{ - // Delete the file data & tnodes - yaffs_ResizeFile(in,0); - yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top); - - return yaffs_DoGenericObjectDeletion(in); -} - -static int yaffs_DeleteDirectory(yaffs_Object *in) -{ - //First check that the directory is empty. - if(list_empty(&in->variant.directoryVariant.children)) - { - return yaffs_DoGenericObjectDeletion(in); - } - - return YAFFS_FAIL; - -} - -static int yaffs_DeleteSymLink(yaffs_Object *in) -{ - YFREE(in->variant.symLinkVariant.alias); - - return yaffs_DoGenericObjectDeletion(in); -} - -static int yaffs_DeleteHardLink(yaffs_Object *in) -{ - // remove this hardlink from the list assocaited with the equivalent - // object - list_del(&in->hardLinks); - return yaffs_DoGenericObjectDeletion(in); -} - - -static int yaffs_UnlinkWorker(yaffs_Object *obj) -{ - - - if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) - { - return yaffs_DeleteHardLink(obj); - } - else if(!list_empty(&obj->hardLinks)) - { -#if 0 - // Curve ball: We're unlinking an object that has a hardlink. - // Therefore we can't really delete the object. - // Instead, we do the following: - // - Select a hardlink. - // - Re-type a hardlink as the equivalent object and populate the fields, including the - // objectId. Updating the object id is important so that all the hardlinks do not need - // to be rewritten. - // - Update the equivalet object pointers. - // - Delete all object. - - yaffs_Object *hl; - struct list_head *i; - - - yaffs_RemoveObjectFromDirectory(obj); - - - - hl = list_entry(obj->hardLinks.next, yaffs_Object,hardLinks); - - hl->dirty = 1; - hl->st_mode = obj->st_mode; - hl->st_uid = obj->st_uid; - hl->st_gid = obj->st_gid; - hl->st_atime = obj->st_atime; - hl->st_mtime = obj->st_mtime; - hl->st_ctime = obj->st_ctime; - - hl->variantType = obj->variantType; - - switch(hl->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: - case YAFFS_OBJECT_TYPE_SYMLINK: - // These types are OK to just copy across. - hl->variant = obj->variant; - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - // Fix the list up - list_add(&hl->variant.directoryVariant.children, - &obj->variant.directoryVariant.children); - list_del(&obj->variant.directoryVariant.children); - - // Now change all the directory children to point to the new parent. - list_for_each(i,&hl->variant.directoryVariant.children) - { - list_entry(i,yaffs_Object,siblings)->parent = hl; - } - break; - - case YAFFS_OBJECT_TYPE_HARDLINK: - case YAFFS_OBJECT_TYPE_UNKNOWN: - // Should not be either of these types. - } - - // Now fix up the hardlink chain - list_del(&obj->hardLinks); - - list_for_each(i,&hl->hardLinks) - { - list_entry(i,yaffs_Object,hardLinks)->variant.hardLinkVariant.equivalentObject = hl; - list_entry(i,yaffs_Object,hardLinks)->variant.hardLinkVariant.equivalentObjectId = hl->objectId; - } - - // Now fix up the hash links. - yaffs_UnhashObject(hl); - hl->objectId = obj->objectId; - yaffs_HashObject(hl); - - // Update the hardlink which has become an object - yaffs_UpdateObjectHeader(hl,NULL); - - // Finally throw away the deleted object - yaffs_DeleteChunk(obj->myDev,obj->chunkId); - yaffs_FreeObject(obj); - - return YAFFS_OK; -#else - // Curve ball: We're unlinking an object that has a hardlink. - // - // This problem arises because we are not strictly following - // The Linux link/inode model. - // - // We can't really delete the object. - // Instead, we do the following: - // - Select a hardlink. - // - Unhook it from the hard links - // - Unhook it from its parent directory (so that the rename can work) - // - Rename the object to the hardlink's name. - // - Delete the hardlink - - - yaffs_Object *hl; - int retVal; - char name[YAFFS_MAX_NAME_LENGTH+1]; - - hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks); - - list_del_init(&hl->hardLinks); - list_del_init(&hl->siblings); - - yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1); - - retVal = yaffs_ChangeObjectName(obj, hl->parent, name); - - if(retVal == YAFFS_OK) - { - retVal = yaffs_DoGenericObjectDeletion(hl); - } - return retVal; - -#endif - - - } - else - { - switch(obj->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: - return yaffs_DeleteFile(obj); - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - return yaffs_DeleteDirectory(obj); - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - return yaffs_DeleteSymLink(obj); - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - case YAFFS_OBJECT_TYPE_UNKNOWN: - default: - return YAFFS_FAIL; - } - } -} - -int yaffs_Unlink(yaffs_Object *dir, const char *name) -{ - yaffs_Object *obj; - - obj = yaffs_FindObjectByName(dir,name); - - if(obj && obj->unlinkAllowed) - { - return yaffs_UnlinkWorker(obj); - } - - return YAFFS_FAIL; - -} - -//////////////// Initialisation Scanning ///////////////// - - -static int yaffs_Scan(yaffs_Device *dev) -{ - yaffs_Spare spare; - yaffs_Tags tags; - int blk; - int chunk; - int c; - int deleted; - yaffs_BlockState state; - yaffs_Object *hardList = NULL; - yaffs_Object *hl; - -// int inuse; -// __u32 pageBits; - - yaffs_ObjectHeader *oh; - yaffs_Object *in; - yaffs_Object *parent; - - __u8 chunkData[YAFFS_BYTES_PER_CHUNK]; - - - // Scan all the blocks... - - for(blk = dev->startBlock; blk <= dev->endBlock; blk++) - { - deleted = 0; - dev->blockInfo[blk].pageBits = 0; - dev->blockInfo[blk].pagesInUse = 0; - state = YAFFS_BLOCK_STATE_SCANNING; - - // Read each chunk in the block. - - for(c = 0; c < YAFFS_CHUNKS_PER_BLOCK && - state == YAFFS_BLOCK_STATE_SCANNING; c++) - { - // Read the spare area and decide what to do - chunk = blk * YAFFS_CHUNKS_PER_BLOCK + c; - - yaffs_ReadChunkFromNAND(dev,chunk,NULL,&spare); - - - // Is this a valid block? - if(yaffs_countBits[spare.blockStatus] >= 7) - { - // This block looks ok, now what's in this chunk? - yaffs_GetTagsFromSpare(&spare,&tags); - - if(yaffs_countBits[spare.pageStatus] < 6) - { - // A deleted chunk - deleted++; - dev->nFreeChunks ++; - T((" %d %d deleted\n",blk,c)); - } - else if(tags.objectId == YAFFS_UNUSED_OBJECT_ID) - { - // An unassigned chunk in the block - // This means that either the block is empty or - // this is the one being allocated from - - if(c == 0) - { - // the block is unused - state = YAFFS_BLOCK_STATE_EMPTY; - dev->nErasedBlocks++; - } - else - { - // this is the block being allocated from - T((" allocating %d %d\n",blk,c)); - state = YAFFS_BLOCK_STATE_ALLOCATING; - dev->allocationBlock = blk; - dev->allocationPage = c; - } - - dev->nFreeChunks += (YAFFS_CHUNKS_PER_BLOCK - c); - } - else if(tags.chunkId > 0) - { - // A data chunk. - dev->blockInfo[blk].pageBits |= (1 << c); - dev->blockInfo[blk].pagesInUse++; - - in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE); - // PutChunkIntoFIle checks for a clash (two data chunks with - // the same chunkId). - yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1); - T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); - } - else - { - // chunkId == 0, so it is an ObjectHeader. - // Thus, we read in the object header and make the object - dev->blockInfo[blk].pageBits |= (1 << c); - dev->blockInfo[blk].pagesInUse++; - - yaffs_ReadChunkFromNAND(dev,chunk,chunkData,NULL); - - oh = (yaffs_ObjectHeader *)chunkData; - - in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type); - - if(in->valid) - { - // We have already filled this one. We have a duplicate and need to resolve it. - - unsigned existingSerial = in->serial; - unsigned newSerial = tags.serialNumber; - - if(((existingSerial+1) & 3) == newSerial) - { - // Use new one - destroy the exisiting one - yaffs_DeleteChunk(dev,in->chunkId); - in->valid = 0; - } - else - { - // Use existing - destroy this one. - yaffs_DeleteChunk(dev,chunk); - } - } - - if(!in->valid) - { - // we need to load this info - - in->valid = 1; - in->variantType = oh->type; - - in->st_mode = oh->st_mode; - in->st_uid = oh->st_uid; - in->st_gid = oh->st_gid; - in->st_atime = oh->st_atime; - in->st_mtime = oh->st_mtime; - in->st_ctime = oh->st_ctime; - in->chunkId = chunk; - - in->sum = oh->sum; - in->dirty = 0; - - // directory stuff... - // hook up to parent - - parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY); - if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN) - { - // Set up as a directory - parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY; - INIT_LIST_HEAD(&parent->variant.directoryVariant.children); - } - else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) - { - // Hoosterman, another problem.... - // We're trying to use a non-directory as a directory - // Todo ... handle - } - - yaffs_AddObjectToDirectory(parent,in); - - // Note re hardlinks. - // Since we might scan a hardlink before its equivalent object is scanned - // we put them all in a list. - // After scanning is complete, we should have all the objects, so we run through this - // list and fix up all the chains. - - switch(in->variantType) - { - case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem - break; - case YAFFS_OBJECT_TYPE_FILE: - in->variant.fileVariant.fileSize = oh->fileSize; - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId; - (yaffs_Object *)(in->hardLinks.next) = hardList; - hardList = in; - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing - break; - case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing - in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias); - break; - } - T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType)); - } - } - } - else - { - // it's a bad block - state = YAFFS_BLOCK_STATE_DEAD; - } - } - - if(state == YAFFS_BLOCK_STATE_SCANNING) - { - // If we got this far while scanning, then the block is fully allocated. - state = YAFFS_BLOCK_STATE_FULL; - } - - dev->blockInfo[blk].blockState = state; - - // Now let's see if it was dirty - if( dev->blockInfo[blk].pagesInUse == 0 && - dev->blockInfo[blk].blockState == YAFFS_BLOCK_STATE_FULL) - { - yaffs_BlockBecameDirty(dev,blk); - } - - } - - // Fix up the hard link chains. - // We should now have scanned all the objects, now it's time to add these - // hardlinks. - while(hardList) - { - hl = hardList; - hardList = (yaffs_Object *)(hardList->hardLinks.next); - - in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId); - - if(in) - { - // Add the hardlink pointers - hl->variant.hardLinkVariant.equivalentObject=in; - list_add(&hl->hardLinks,&in->hardLinks); - } - else - { - //Todo Need to report/handle this better. - // Got a problem... hardlink to a non-existant object - hl->variant.hardLinkVariant.equivalentObject=NULL; - INIT_LIST_HEAD(&hl->hardLinks); - - } - - } - - - - return YAFFS_OK; -} - - -////////////////////////// Directory Functions ///////////////////////// - - -static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj) -{ - - if(obj->siblings.prev == NULL) - { - // Not initialised - INIT_LIST_HEAD(&obj->siblings); - - } - else if(!list_empty(&obj->siblings)) - { - // If it is holed up somewhere else, un hook it - list_del_init(&obj->siblings); - } - // Now add it - list_add(&obj->siblings,&directory->variant.directoryVariant.children); - obj->parent = directory; -} - -static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj) -{ - list_del_init(&obj->siblings); - obj->parent = NULL; -} - -yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const char *name) -{ - int sum; - - struct list_head *i; - __u8 buffer[YAFFS_BYTES_PER_CHUNK]; - yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer; - - yaffs_Object *l; - - sum = yaffs_CalcNameSum(name); - - list_for_each(i,&directory->variant.directoryVariant.children) - { - l = list_entry(i, yaffs_Object,siblings); - - // Special case for lost-n-found - if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND) - { - if(strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0) - { - return l; - } - } - else if(l->sum == sum) - { - // Do a real check - yaffs_ReadChunkFromNAND(l->myDev,l->chunkId,buffer,NULL); - if(strcmp(name,oh->name) == 0) - { - return l; - } - - - } - } - - return NULL; -} - - -int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *)) -{ - struct list_head *i; - yaffs_Object *l; - - - list_for_each(i,&theDir->variant.directoryVariant.children) - { - l = list_entry(i, yaffs_Object,siblings); - if(!fn(l)) - { - return YAFFS_FAIL; - } - } - - return YAFFS_OK; - -} - - -// GetEquivalentObject dereferences any hard links to get to the -// actual object. - -yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj) -{ - if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) - { - // We want the object id of the equivalent object, not this one - obj = obj->variant.hardLinkVariant.equivalentObject; - } - return obj; - -} - -int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize) -{ - memset(name,0,buffSize); - - if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) - { - strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1); - } - else - { - __u8 buffer[YAFFS_BYTES_PER_CHUNK]; - yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer; - - memset(buffer,0,YAFFS_BYTES_PER_CHUNK); - - if(obj->chunkId >= 0) - { - yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL); - } - strncpy(name,oh->name,buffSize - 1); - } - - return strlen(name); -} - -int yaffs_GetObjectFileLength(yaffs_Object *obj) -{ - - // Dereference any hard linking - obj = yaffs_GetEquivalentObject(obj); - - if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) - { - return obj->variant.fileVariant.fileSize; - } - if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) - { - return strlen(obj->variant.symLinkVariant.alias); - } - else - { - // Only a directory should drop through to here - return YAFFS_BYTES_PER_CHUNK; - } -} - -int yaffs_GetObjectLinkCount(yaffs_Object *obj) -{ - int count = 1; // the object itself - struct list_head *i; - - list_for_each(i,&obj->hardLinks) - { - count++; - } - return count; - -} - - -int yaffs_GetObjectInode(yaffs_Object *obj) -{ - obj = yaffs_GetEquivalentObject(obj); - - return obj->objectId; -} - -unsigned yaffs_GetObjectType(yaffs_Object *obj) -{ - obj = yaffs_GetEquivalentObject(obj); - - switch(obj->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: return DT_REG; break; - case YAFFS_OBJECT_TYPE_DIRECTORY: return DT_DIR; break; - case YAFFS_OBJECT_TYPE_SYMLINK: return DT_LNK; break; - case YAFFS_OBJECT_TYPE_HARDLINK: return DT_REG; break; - default: return DT_REG; break; - } -} - -char *yaffs_GetSymlinkAlias(yaffs_Object *obj) -{ - obj = yaffs_GetEquivalentObject(obj); - if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) - { - return yaffs_CloneString(obj->variant.symLinkVariant.alias); - } - else - { - return yaffs_CloneString(""); - } -} - - -int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr) -{ - unsigned int valid = attr->ia_valid; - - if(valid & ATTR_MODE) obj->st_mode = attr->ia_mode; - if(valid & ATTR_UID) obj->st_uid = attr->ia_uid; - if(valid & ATTR_GID) obj->st_gid = attr->ia_gid; - - if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime; - if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime; - if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime; - - if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size); - - yaffs_UpdateObjectHeader(obj,NULL); - - return YAFFS_OK; - -} -int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr) -{ - unsigned int valid = 0; - - attr->ia_mode = obj->st_mode; valid |= ATTR_MODE; - attr->ia_uid = obj->st_uid; valid |= ATTR_UID; - attr->ia_gid = obj->st_gid; valid |= ATTR_GID; - - attr->ia_atime = obj->st_atime; valid |= ATTR_ATIME; - attr->ia_ctime = obj->st_ctime; valid |= ATTR_CTIME; - attr->ia_mtime = obj->st_mtime; valid |= ATTR_MTIME; - - attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE; - - attr->ia_valid = valid; - - return YAFFS_OK; - -} - - - -int yaffs_DumpObject(yaffs_Object *obj) -{ - __u8 buffer[YAFFS_BYTES_PER_CHUNK]; - char name[256]; -// yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer; - - memset(buffer,0,YAFFS_BYTES_PER_CHUNK); - - if(obj->chunkId >= 0) - { - yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL); - } - - yaffs_GetObjectName(obj,name,256); - - YPRINTF(("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n", - obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial, - obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj))); - -#if 0 - YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n", - obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial, - obj->sum, obj->chunkId)); - switch(obj->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: - YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize)); - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - YPRINTF((" DIRECTORY\n")); - break; - case YAFFS_OBJECT_TYPE_HARDLINK: //todo - case YAFFS_OBJECT_TYPE_SYMLINK: - case YAFFS_OBJECT_TYPE_UNKNOWN: - default: - } -#endif - - return YAFFS_OK; -} - - -///////////////////////// Initialisation code /////////////////////////// - - - -int yaffs_GutsInitialise(yaffs_Device *dev) -{ - unsigned nChunks,x; - int bits; - - - dev = dev; - - if(!yaffs_CheckStructures()) - { - return YAFFS_FAIL; - } - - - // OK now calculate a few things for the device - // Calculate chunkGroupBits. - // If there are 64k or less chunks then this is 1 - // Else it is log2(nChunks) - 16 - // - x = nChunks = YAFFS_CHUNKS_PER_BLOCK * dev->nBlocks; - - for(bits = 0, x = nChunks; (x & 1) == 0; bits++) - { - x >>= 1; - } - - if( x != 1) - { - // Not a power of 2 - YPRINTF(("nBlocks should be a power of 2 but is %u\n", - dev->nBlocks)); - return YAFFS_FAIL; - } - - if(bits <= 16) - { - dev->chunkGroupBits = 0; - dev->chunkGroupSize = 1; - } - else - { - dev->chunkGroupBits = bits - 16; - dev->chunkGroupSize = nChunks/0x10000; - } - - // More device initialisation - dev->garbageCollectionRequired = 0; - dev->currentDirtyChecker = 0; - - yaffs_InitialiseBlocks(dev); - - yaffs_InitialiseTnodes(dev); - - yaffs_InitialiseObjects(dev); - - - // Initialise the root and lost and found directories - dev->lostNFoundDir = dev->rootDir = NULL; - dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR); - dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_ROOT_MODE | S_IFDIR); - yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir); - - // Now scan the flash. - yaffs_Scan(dev); - - - return YAFFS_OK; - -} - -void yaffs_Deinitialise(yaffs_Device *dev) -{ - yaffs_DeinitialiseBlocks(dev); - yaffs_DeinitialiseTnodes(dev); - yaffs_DeinitialiseObjects(dev); - -} - -int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev) -{ - int nFree = dev->nFreeChunks - (YAFFS_CHUNKS_PER_BLOCK * YAFFS_RESERVED_BLOCKS); - - return (nFree < 0) ? 0 : nFree; - -} - - -/////////////////// YAFFS test code ////////////////////////////////// - -#define yaffs_CheckStruct(structure,syze, name) \ - if(sizeof(structure) != syze) \ - { YPRINTF(("%s should be %d but is %d\n",name,syze,sizeof(structure))); \ - return YAFFS_FAIL; \ - } - - -static int yaffs_CheckStructures(void) -{ - yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") - yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") - yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") - yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode") - yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader") - - - return YAFFS_OK; -} - -void yaffs_GutsTest(yaffs_Device *dev) -{ - - if(yaffs_CheckStructures() != YAFFS_OK) - { - YPRINTF(("One or more structures malformed-- aborting\n")); - } - else - { - YPRINTF(("Structures OK\n")); - } - - yaffs_TnodeTest(dev); - yaffs_ObjectTest(dev); -} - - +/* + * YAFFS: Yet another FFS. A NAND-flash specific file system. + * yaffs_guts.c The main guts of YAFFS + * + * Copyright (C) 2002 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 General Public License version 2 as + * published by the Free Software Foundation. + * + */ + //yaffs_guts.c + +#include "yportenv.h" + +#include "yaffsinterface.h" +#include "yaffs_guts.h" + + + +// External functions for ECC on data +void nand_calculate_ecc (const u_char *dat, u_char *ecc_code); +int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc); + + +// countBits is a quick way of counting the number of bits in a byte. +// ie. countBits[n] holds the number of 1 bits in a byte with the value n. + +static const char yaffs_countBits[256] = +{ +0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4, +1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, +1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, +1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, +3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, +4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8 +}; + + + +// Device info +//static yaffs_Device *yaffs_device; +//yaffs_Object *yaffs_rootDir; +//yaffs_Object *yaffs_lostNFound; + + + +// Local prototypes +static int yaffs_CheckObjectHashSanity(yaffs_Device *dev); +static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr); +static void yaffs_GetTagsFromSpare(yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr); +static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan); + +static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type); +static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj); +static int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name); +static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId); +static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj); +static int yaffs_CheckStructures(void); + +loff_t yaffs_GetFileSize(yaffs_Object *obj); + +static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted); +static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted); + + +static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve); + +#ifdef YAFFS_PARANOID +static int yaffs_CheckFileSanity(yaffs_Object *in); +#else +#define yaffs_CheckFileSanity(in) +#endif + +static int __inline__ yaffs_HashFunction(int n) +{ + return (n % YAFFS_NOBJECT_BUCKETS); +} + + +yaffs_Object *yaffs_Root(yaffs_Device *dev) +{ + return dev->rootDir; +} + +yaffs_Object *yaffs_LostNFound(yaffs_Device *dev) +{ + return dev->lostNFoundDir; +} + + +static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare) +{ + dev->nPageWrites++; + return dev->writeChunkToNAND(dev,chunkInNAND,data,spare); +} + +int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare) +{ + int retVal; + __u8 calcEcc[3]; + yaffs_Spare localSpare; + int eccResult1,eccResult2; + + dev->nPageReads++; + + if(!spare && data) + { + // If we don't have a real spare, then we use a local one. + // Need this for the calculation of the ecc + spare = &localSpare; + } + + retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,spare); + if(data) + { + // Do ECC correction + //Todo handle any errors + nand_calculate_ecc(data,calcEcc); + eccResult1 = nand_correct_data (data,spare->ecc1, calcEcc); + nand_calculate_ecc(&data[256],calcEcc); + eccResult2 = nand_correct_data (&data[256],spare->ecc2, calcEcc); + + if(eccResult1>0) + { + T((TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND)); + } + else if(eccResult1<0) + { + T((TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND)); + } + + if(eccResult2>0) + { + T((TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND)); + } + else if(eccResult2<0) + { + T((TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND)); + } + } + return retVal; +} + +#ifdef YAFFS_PARANOID + +static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND) +{ + static int init = 0; + static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK]; + static __u8 data[YAFFS_BYTES_PER_CHUNK]; + static __u8 spare[16]; + + int retVal; + + retVal = YAFFS_OK; + + dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare *)spare); + + + + if(!init) + { + memset(cmpbuf,0xff,YAFFS_BYTES_PER_CHUNK); + init = 1; + } + + if(memcmp(cmpbuf,data,YAFFS_BYTES_PER_CHUNK)) retVal = YAFFS_FAIL; + if(memcmp(cmpbuf,spare,16)) retVal = YAFFS_FAIL; + + return retVal; + +} + +#endif + + +int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND) +{ + dev->nBlockErasures++; + return dev->eraseBlockInNAND(dev,blockInNAND); +} + +int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev) +{ + return dev->initialiseNAND(dev); +} + +static int yaffs_WriteNewChunkToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_Spare *spare,int useReserve) +{ + int chunk; + + int writeOk = 0; + int attempts = 0; + + unsigned char rbData[YAFFS_BYTES_PER_CHUNK]; + yaffs_Spare rbSpare; + + do{ + chunk = yaffs_AllocateChunk(dev,useReserve); + + if(chunk >= 0) + { + writeOk = yaffs_WriteChunkToNAND(dev,chunk,data,spare); + attempts++; + if(writeOk) + { + // Readback & verify + // If verify fails, then delete this chunk and try again + // To verify we compare everything except the block and + // page status bytes. + yaffs_ReadChunkFromNAND(dev,chunk,rbData,&rbSpare); + + if(memcmp(data,rbData,YAFFS_BYTES_PER_CHUNK) != 0 || + spare->tagByte0 != rbSpare.tagByte0 || + spare->tagByte1 != rbSpare.tagByte1 || + spare->tagByte2 != rbSpare.tagByte2 || + spare->tagByte3 != rbSpare.tagByte3 || + spare->tagByte4 != rbSpare.tagByte4 || + spare->tagByte5 != rbSpare.tagByte5 || + spare->tagByte6 != rbSpare.tagByte6 || + spare->tagByte7 != rbSpare.tagByte7 || + spare->ecc1[0] != rbSpare.ecc1[0] || + spare->ecc1[1] != rbSpare.ecc1[1] || + spare->ecc1[2] != rbSpare.ecc1[2] || + spare->ecc2[0] != rbSpare.ecc2[0] || + spare->ecc2[1] != rbSpare.ecc2[1] || + spare->ecc2[2] != rbSpare.ecc2[2] ) + { + // Didn't verify + yaffs_DeleteChunk(dev,chunk); + T((TSTR("**>> yaffs write failed on chunk %d" TENDSTR), chunk)); + + writeOk = 0; + } + + } + } + } while(chunk >= 0 && ! writeOk); + + if(attempts > 1) + { + T((TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts)); + dev->nRetriedWrites+= (attempts - 1); + } + + return chunk; +} + + + + +///////////////////////// Object management ////////////////// +// List of spare objects +// The list is hooked together using the first pointer +// in the object + +// static yaffs_Object *yaffs_freeObjects = NULL; + +// static int yaffs_nFreeObjects; + +// static yaffs_ObjectList *yaffs_allocatedObjectList = NULL; + +// static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS]; + + +static __u16 yaffs_CalcNameSum(const char *name) +{ + __u16 sum = 0; + __u16 i = 1; + + __u8 *bname = (__u8 *)name; + + while (*bname) + { + sum += (*bname) * i; + i++; + bname++; + } + return sum; +} + + +void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare) +{ + nand_calculate_ecc (data , spare->ecc1); + nand_calculate_ecc (&data[256] , spare->ecc2); +} + +void yaffs_CalcTagsECC(yaffs_Tags *tags) +{ + // Calculate an ecc + + unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes; + unsigned i,j; + unsigned ecc = 0; + unsigned bit = 0; + + tags->ecc = 0; + + for(i = 0; i < 8; i++) + { + for(j = 1; j &0x7f; j<<=1) + { + bit++; + if(b[i] & j) + { + ecc ^= bit; + } + } + } + + tags->ecc = ecc; + + +} + +void yaffs_CheckECCOnTags(yaffs_Tags *tags) +{ + unsigned ecc = tags->ecc; + + yaffs_CalcTagsECC(tags); + + ecc ^= tags->ecc; + + if(ecc) + { + // Needs fixing + unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes; + + ecc--; + + b[ecc / 8] ^= (1 << (ecc & 7)); + + // Now recvalc the ecc + yaffs_CalcTagsECC(tags); + } +} + + +///////////////////////// TNODES /////////////////////// + +// List of spare tnodes +// The list is hooked together using the first pointer +// in the tnode. + +//static yaffs_Tnode *yaffs_freeTnodes = NULL; + +// static int yaffs_nFreeTnodes; + +//static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL; + + + +// yaffs_CreateTnodes creates a bunch more tnodes and +// adds them to the tnode free list. +// Don't use this function directly + +static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes) +{ + int i; + yaffs_Tnode *newTnodes; + yaffs_TnodeList *tnl; + + if(nTnodes < 1) return YAFFS_OK; + + // make these things + + newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode)); + + if (!newTnodes) + { + YALERT("Could not malloc tnodes"); + return YAFFS_FAIL; + } + + // Hook them into the free list + for(i = 0; i < nTnodes - 1; i++) + { + newTnodes[i].internal[0] = &newTnodes[i+1]; + } + + newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes; + dev->freeTnodes = newTnodes; + dev->nFreeTnodes+= nTnodes; + dev->nTnodesCreated += nTnodes; + + // Now add this bunch of tnodes to a list for freeing up. + + tnl = YMALLOC(sizeof(yaffs_TnodeList)); + if(!tnl) + { + YALERT("Could not add tnodes to management list"); + } + else + { + tnl->tnodes = newTnodes; + tnl->next = dev->allocatedTnodeList; + dev->allocatedTnodeList = tnl; + } + + + YINFO("Tnodes created"); + + + return YAFFS_OK; +} + + +// GetTnode gets us a clean tnode. Tries to make allocate more if we run out +static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev) +{ + yaffs_Tnode *tn = NULL; + + // If there are none left make more + if(!dev->freeTnodes) + { + yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES); + } + + if(dev->freeTnodes) + { + tn = dev->freeTnodes; + dev->freeTnodes = dev->freeTnodes->internal[0]; + dev->nFreeTnodes--; + // zero out + memset(tn,0,sizeof(yaffs_Tnode)); + } + + + return tn; +} + + +// FreeTnode frees up a tnode and puts it back on the free list +static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn) +{ + tn->internal[0] = dev->freeTnodes; + dev->freeTnodes = tn; + dev->nFreeTnodes++; +} + + +static void yaffs_DeinitialiseTnodes(yaffs_Device*dev) +{ + // Free the list of allocated tnodes + + while(dev->allocatedTnodeList) + { + YFREE(dev->allocatedTnodeList->tnodes); + dev->allocatedTnodeList = dev->allocatedTnodeList->next; + } + + dev->freeTnodes = NULL; + dev->nFreeTnodes = 0; +} + +static void yaffs_InitialiseTnodes(yaffs_Device*dev) +{ + dev->allocatedTnodeList = NULL; + dev->freeTnodes = NULL; + dev->nFreeTnodes = 0; + dev->nTnodesCreated = 0; + +} + +void yaffs_TnodeTest(yaffs_Device *dev) +{ + + int i; + int j; + yaffs_Tnode *tn[1000]; + + YINFO("Testing TNodes"); + + for(j = 0; j < 50; j++) + { + for(i = 0; i < 1000; i++) + { + tn[i] = yaffs_GetTnode(dev); + if(!tn[i]) + { + YALERT("Getting tnode failed"); + } + } + for(i = 0; i < 1000; i+=3) + { + yaffs_FreeTnode(dev,tn[i]); + tn[i] = NULL; + } + + } +} + +////////////////// END OF TNODE MANIPULATION /////////////////////////// + +/////////////// Functions to manipulate the look-up tree (made up of tnodes) +// The look up tree is represented by the top tnode and the number of topLevel +// in the tree. 0 means only the level 0 tnode is in the tree. + + +// FindLevel0Tnode finds the level 0 tnode, if one exists. +// Used when reading..... +static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId) +{ + + yaffs_Tnode *tn = fStruct->top; + __u32 i; + int requiredTallness; + int level = fStruct->topLevel; + + // Check sane level and chunk Id + if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL) + { + char str[50]; + sprintf(str,"Bad level %d",level); + YALERT(str); + return NULL; + } + + if(chunkId > YAFFS_MAX_CHUNK_ID) + { + char str[50]; + sprintf(str,"Bad chunkId %d",chunkId); + YALERT(str); + return NULL; + } + + // First check we're tall enough (ie enough topLevel) + + i = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS); + requiredTallness = 0; + while(i) + { + i >>= YAFFS_TNODES_INTERNAL_BITS; + requiredTallness++; + } + + + if(requiredTallness > fStruct->topLevel) + { + // Not tall enough, so we can't find it, return NULL. + return NULL; + } + + + // Traverse down to level 0 + while (level > 0 && tn) + { + tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) & + YAFFS_TNODES_INTERNAL_MASK]; + level--; + + } + + return tn; +} + +// AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree. +// This happens in two steps: +// 1. If the tree isn't tall enough, then make it taller. +// 2. Scan down the tree towards the level 0 tnode adding tnodes if required. +// +// Used when modifying the tree. +// +static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId) +{ + + yaffs_Tnode *tn; + + int requiredTallness; + + __u32 i; + __u32 l; + + + //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId)); + + // Check sane level and page Id + if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) + { + char str[50]; + sprintf(str,"Bad level %d",fStruct->topLevel); + YALERT(str); + return NULL; + } + + if(chunkId > YAFFS_MAX_CHUNK_ID) + { + char str[50]; + sprintf(str,"Bad chunkId %d",chunkId); + YALERT(str); + return NULL; + } + + // First check we're tall enough (ie enough topLevel) + + i = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS); + requiredTallness = 0; + while(i) + { + i >>= YAFFS_TNODES_INTERNAL_BITS; + requiredTallness++; + } + + //T((TSTR(" required=%d"),requiredTallness)); + + + if(requiredTallness > fStruct->topLevel) + { + // Not tall enough,gotta make the tree taller + for(i = fStruct->topLevel; i < requiredTallness; i++) + { + //T((TSTR(" add new top"))); + + tn = yaffs_GetTnode(dev); + + if(tn) + { + tn->internal[0] = fStruct->top; + fStruct->top = tn; + } + else + { + YALERT("No more tnodes"); + } + } + + fStruct->topLevel = requiredTallness; + } + + + // Traverse down to level 0, adding anything we need + + l = fStruct->topLevel; + tn = fStruct->top; + while (l > 0 && tn) + { + i = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) & + YAFFS_TNODES_INTERNAL_MASK; + + //T((TSTR(" [%d:%d]"),l,i)); + + if(!tn->internal[i]) + { + //T((TSTR(" added"))); + + tn->internal[i] = yaffs_GetTnode(dev); + } + + tn = tn->internal[i]; + l--; + + } + + //TSTR(TENDSTR))); + + return tn; +} + +// DeleteWorker scans backwards through the tnode tree and delets all the +// chunks and tnodes in the file + +static void yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset) +{ + int i; + int chunkInInode; + int theChunk; + yaffs_Tags tags; + int found; + int chunkDeleted; + + + if(tn) + { + if(level > 0) + { + + for(i = YAFFS_NTNODES_INTERNAL -1; i >= 0; i--) + { + if(tn->internal[i]) + { + yaffs_DeleteWorker(in,tn->internal[i],level - 1, + (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ); + yaffs_FreeTnode(in->myDev,tn->internal[i]); + tn->internal[i] = NULL; + } + + } + } + else if(level == 0) + { + for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0; i--) + { + if(tn->level0[i]) + { + int j; + + chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i; + + theChunk = tn->level0[i] << in->myDev->chunkGroupBits; + + // Now we need to search for it + for(j = 0,found = 0; theChunk && j < in->myDev->chunkGroupSize && !found; j++) + { + yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,&tags,&chunkDeleted); + if(yaffs_TagsMatch(&tags,in->objectId,chunkInInode,chunkDeleted)) + { + // found it; + found = 1; + + } + else + { + theChunk++; + } + } + + if(found) + { + yaffs_DeleteChunk(in->myDev,theChunk); + + } + + tn->level0[i] = 0; + } + + } + + } + + } + +} + + + + +// Pruning removes any part of the file structure tree that is beyond the +// bounds of the file (ie that does not point to chunks). +// +// A file should only get pruned when its size is reduced. +// +// Before pruning, the chunks must be pulled from the tree and the +// level 0 tnode entries must be zeroed out. +// Could also use this for file deletion, but that's probably better handled +// by a special case. + +// yaffs_PruneWorker should only be called by yaffs_PruneFileStructure() + +static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0) +{ + int i; + int hasData; + + if(tn) + { + hasData = 0; + + for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++) + { + if(tn->internal[i] && level > 0) + { + tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1); + } + + if(tn->internal[i]) + { + hasData++; + } + } + + if(hasData == 0 && del0) + { + // Free and return NULL + + yaffs_FreeTnode(dev,tn); + tn = NULL; + } + + } + + return tn; + +} + +static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct) +{ + int i; + int hasData; + int done = 0; + yaffs_Tnode *tn; + + if(fStruct->topLevel > 0) + { + fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0); + + // Now we have a tree with all the non-zero branches NULL but the height + // is the same as it was. + // Let's see if we can trim internal tnodes to shorten the tree. + // We can do this if only the 0th element in the tnode is in use + // (ie all the non-zero are NULL) + + while(fStruct->topLevel && !done) + { + tn = fStruct->top; + + hasData = 0; + for(i = 1; i internal[i]) + { + hasData++; + } + } + + if(!hasData) + { + fStruct->top = tn->internal[0]; + fStruct->topLevel--; + yaffs_FreeTnode(dev,tn); + } + else + { + done = 1; + } + } + } + + return YAFFS_OK; +} + + + + +/////////////////////// End of File Structure functions. ///////////////// + +// yaffs_CreateFreeObjects creates a bunch more objects and +// adds them to the object free list. +static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects) +{ + int i; + yaffs_Object *newObjects; + yaffs_ObjectList *list; + + if(nObjects < 1) return YAFFS_OK; + + // make these things + + newObjects = YMALLOC(nObjects * sizeof(yaffs_Object)); + + if (!newObjects) + { + YALERT("Could not allocate more objects"); + return YAFFS_FAIL; + } + + // Hook them into the free list + for(i = 0; i < nObjects - 1; i++) + { + (yaffs_Object *)newObjects[i].siblings.next = &newObjects[i+1]; + } + + newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects; + dev->freeObjects = newObjects; + dev->nFreeObjects+= nObjects; + dev->nObjectsCreated+= nObjects; + + // Now add this bunch of Objects to a list for freeing up. + + list = YMALLOC(sizeof(yaffs_ObjectList)); + if(!list) + { + YALERT("Could not add Objects to management list"); + } + else + { + list->objects = newObjects; + list->next = dev->allocatedObjectList; + dev->allocatedObjectList = list; + } + + + YINFO("Objects created"); + + + return YAFFS_OK; +} + + +// AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out +static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev) +{ + yaffs_Object *tn = NULL; + + // If there are none left make more + if(!dev->freeObjects) + { + yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS); + } + + if(dev->freeObjects) + { + tn = dev->freeObjects; + dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next); + dev->nFreeObjects--; + + // Now sweeten it up... + + memset(tn,0,sizeof(yaffs_Object)); + tn->chunkId = -1; + tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN; + INIT_LIST_HEAD(&(tn->hardLinks)); + INIT_LIST_HEAD(&(tn->hashLink)); + INIT_LIST_HEAD(&tn->siblings); + + // Add it to the lost and found directory. + // NB Can't put root or lostNFound in lostNFound so + // check if lostNFound exists first + if(dev->lostNFoundDir) + { + yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn); + } + } + + + return tn; +} + +static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode) +{ + + yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY); + if(obj) + { + obj->fake = 1; // it is fake so it has no NAND presence... + obj->renameAllowed= 0; // ... and we're not allowed to rename it... + obj->unlinkAllowed= 0; // ... or unlink it + obj->st_mode = mode; + obj->myDev = dev; + obj->chunkId = 0; // Not a valid chunk. + } + + return obj; + +} + + +static void yaffs_UnhashObject(yaffs_Object *tn) +{ + int bucket; + yaffs_Device *dev = tn->myDev; + + + // If it is still linked into the bucket list, free from the list + if(!list_empty(&tn->hashLink)) + { + list_del_init(&tn->hashLink); + bucket = yaffs_HashFunction(tn->objectId); + dev->objectBucket[bucket].count--; + } + +} + + +// FreeObject frees up a Object and puts it back on the free list +static void yaffs_FreeObject(yaffs_Object *tn) +{ + + yaffs_Device *dev = tn->myDev; + + yaffs_UnhashObject(tn); + + // Link into the free list. + (yaffs_Object *)(tn->siblings.next) = dev->freeObjects; + dev->freeObjects = tn; + dev->nFreeObjects++; +} + + + + +static void yaffs_DeinitialiseObjects(yaffs_Device *dev) +{ + // Free the list of allocated Objects + + while( dev->allocatedObjectList) + { + YFREE(dev->allocatedObjectList->objects); + dev->allocatedObjectList = dev->allocatedObjectList->next; + } + + dev->freeObjects = NULL; + dev->nFreeObjects = 0; +} + +static void yaffs_InitialiseObjects(yaffs_Device *dev) +{ + int i; + + dev->allocatedObjectList = NULL; + dev->freeObjects = NULL; + dev->nFreeObjects = 0; + + for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) + { + INIT_LIST_HEAD(&dev->objectBucket[i].list); + dev->objectBucket[i].count = 0; + } + +} + + + + + + +int yaffs_FindNiceObjectBucket(yaffs_Device *dev) +{ + static int x = 0; + int i; + int l = 999; + int lowest = 999999; + + + // First let's see if we can find one that's empty. + + for(i = 0; i < 10 && lowest > 0; i++) + { + x++; + x %= YAFFS_NOBJECT_BUCKETS; + if(dev->objectBucket[x].count < lowest) + { + lowest = dev->objectBucket[x].count; + l = x; + } + + } + + // If we didn't find an empty list, then try + // looking a bit further for a short one + + for(i = 0; i < 10 && lowest > 3; i++) + { + x++; + x %= YAFFS_NOBJECT_BUCKETS; + if(dev->objectBucket[x].count < lowest) + { + lowest = dev->objectBucket[x].count; + l = x; + } + + } + + return l; +} + +static int yaffs_CreateNewObjectNumber(yaffs_Device *dev) +{ + int bucket = yaffs_FindNiceObjectBucket(dev); + + // Now find an object value that has not already been taken + // by scanning the list. + + int found = 0; + struct list_head *i; + + int n = bucket; + + //yaffs_CheckObjectHashSanity(); + + while(!found) + { + found = 1; + n += YAFFS_NOBJECT_BUCKETS; + if(1 ||dev->objectBucket[bucket].count > 0) + { + list_for_each(i,&dev->objectBucket[bucket].list) + { + // If there is already one in the list + if(list_entry(i, yaffs_Object,hashLink)->objectId == n) + { + found = 0; + } + } + } + } + + //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n); + + return n; +} + +void yaffs_HashObject(yaffs_Object *in) +{ + int bucket = yaffs_HashFunction(in->objectId); + yaffs_Device *dev = in->myDev; + + if(!list_empty(&in->hashLink)) + { + YINFO("!!!"); + } + + + list_add(&in->hashLink,&dev->objectBucket[bucket].list); + dev->objectBucket[bucket].count++; + +} + +yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,int number) +{ + int bucket = yaffs_HashFunction(number); + struct list_head *i; + yaffs_Object *in; + + list_for_each(i,&dev->objectBucket[bucket].list) + { + // Look if it is in the list + in = list_entry(i, yaffs_Object,hashLink); + if(in->objectId == number) + { + return in; + } + } + + return NULL; +} + + + +yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type) +{ + + yaffs_Object *theObject; + + if(number < 0) + { + number = yaffs_CreateNewObjectNumber(dev); + } + + theObject = yaffs_AllocateEmptyObject(dev); + + if(theObject) + { + theObject->fake = 0; + theObject->renameAllowed = 1; + theObject->unlinkAllowed = 1; + theObject->objectId = number; + theObject->myDev = dev; + yaffs_HashObject(theObject); + theObject->variantType = type; + theObject->st_atime = theObject->st_mtime = theObject->st_ctime = CURRENT_TIME; + + switch(type) + { + case YAFFS_OBJECT_TYPE_FILE: + theObject->variant.fileVariant.fileSize = 0; + theObject->variant.fileVariant.scannedFileSize = 0; + theObject->variant.fileVariant.topLevel = 0; + theObject->variant.fileVariant.top = yaffs_GetTnode(dev); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + INIT_LIST_HEAD(&theObject->variant.directoryVariant.children); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + // No action required + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + // No action required + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + // No action required + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + // todo this should not happen + break; + } + } + + return theObject; +} + +yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type) +{ + yaffs_Object *theObject = NULL; + + if(number > 0) + { + theObject = yaffs_FindObjectByNumber(dev,number); + } + + if(!theObject) + { + theObject = yaffs_CreateNewObject(dev,number,type); + } + + return theObject; + +} + +char *yaffs_CloneString(const char *str) +{ + char *newStr = NULL; + + if(str && *str) + { + newStr = YMALLOC(strlen(str) + 1); + strcpy(newStr,str); + } + + return newStr; + +} + +// +// Mknod (create) a new object. +// equivalentObject only has meaning for a hard link; +// aliasString only has meaning for a sumlink. +// rdev only has meaning for devices (a subset of special objects) +yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type, + yaffs_Object *parent, + const char *name, + __u32 mode, + __u32 uid, + __u32 gid, + yaffs_Object *equivalentObject, + const char *aliasString, + __u32 rdev) +{ + yaffs_Object *in; + + yaffs_Device *dev = parent->myDev; + + // Check if the entry exists. If it does then fail the call since we don't want a dup. + if(yaffs_FindObjectByName(parent,name)) + { + return NULL; + } + + in = yaffs_CreateNewObject(dev,-1,type); + + if(in) + { + in->chunkId = -1; + in->valid = 1; + in->variantType = type; + + in->st_mode = mode; + in->st_rdev = rdev; + in->st_uid = uid; + in->st_gid = gid; + in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME; + + in->nDataChunks = 0; + + in->sum = yaffs_CalcNameSum(name); + in->dirty = 1; + + yaffs_AddObjectToDirectory(parent,in); + + in->myDev = parent->myDev; + + + switch(type) + { + case YAFFS_OBJECT_TYPE_SYMLINK: + in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + in->variant.hardLinkVariant.equivalentObject = equivalentObject; + in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId; + list_add(&in->hardLinks,&equivalentObject->hardLinks); + break; + case YAFFS_OBJECT_TYPE_FILE: // do nothing + case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing + case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing + case YAFFS_OBJECT_TYPE_UNKNOWN: + break; + } + + yaffs_UpdateObjectHeader(in,name); + + } + + return in; +} + +yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid) +{ + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0); +} + +yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid) +{ + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0); +} + +yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev) +{ + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,rdev); +} + +yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,const char *alias) +{ + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0); +} + +// NB yaffs_Link returns the object id of the equivalent object. +yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject) +{ + // Get the real object in case we were fed a hard link as an equivalent object + equivalentObject = yaffs_GetEquivalentObject(equivalentObject); + + if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0)) + { + return equivalentObject; + } + else + { + return NULL; + } + +} + + +static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const char *newName) +{ + //yaffs_Device *dev = obj->myDev; + + if(newDir == NULL) + { + newDir = obj->parent; // use the old directory + } + + // Only proceed if the new name does not exist and + // if we're putting it into a directory. + if(!yaffs_FindObjectByName(newDir,newName) && + newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) + { + obj->sum = yaffs_CalcNameSum(newName); + obj->dirty = 1; + yaffs_AddObjectToDirectory(newDir,obj); + + if(yaffs_UpdateObjectHeader(obj,newName) >= 0) + { + return YAFFS_OK; + } + } + + return YAFFS_FAIL; +} + +int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName) +{ + yaffs_Object *obj; + + obj = yaffs_FindObjectByName(oldDir,oldName); + if(obj && obj->renameAllowed) + { + return yaffs_ChangeObjectName(obj,newDir,newName); + } + return YAFFS_FAIL; +} + + + +static int yaffs_CheckObjectHashSanity(yaffs_Device *dev) +{ + // Scan the buckets and check that the lists + // have as many members as the count says there are + int bucket; + int countEm; + struct list_head *j; + int ok = YAFFS_OK; + + for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++) + { + countEm = 0; + + list_for_each(j,&dev->objectBucket[bucket].list) + { + countEm++; + } + + if(countEm != dev->objectBucket[bucket].count) + { + YALERT("Inode hash inconsistency"); + ok = YAFFS_FAIL; + } + } + + return ok; +} + +void yaffs_ObjectTest(yaffs_Device *dev) +{ + yaffs_Object *in[1000]; + int inNo[1000]; + yaffs_Object *inold[1000]; + int i; + int j; + + memset(in,0,1000*sizeof(yaffs_Object *)); + memset(inold,0,1000*sizeof(yaffs_Object *)); + + yaffs_CheckObjectHashSanity(dev); + + for(j = 0; j < 10; j++) + { + //T(("%d\n",j)); + + for(i = 0; i < 1000; i++) + { + in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE); + if(!in[i]) + { + YINFO("No more inodes"); + } + else + { + inNo[i] = in[i]->objectId; + } + } + + for(i = 0; i < 1000; i++) + { + if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i]) + { + //T(("Differnce in look up test\n")); + } + else + { + // T(("Look up ok\n")); + } + } + + yaffs_CheckObjectHashSanity(dev); + + for(i = 0; i < 1000; i+=3) + { + yaffs_FreeObject(in[i]); + in[i] = NULL; + } + + + yaffs_CheckObjectHashSanity(dev); + } + +} + + + +/////////////////////////// Block Management and Page Allocation /////////////////// + + +static void yaffs_InitialiseBlocks(yaffs_Device *dev) +{ + dev->blockInfo = YMALLOC(dev->nBlocks * sizeof(yaffs_BlockInfo)); + memset(dev->blockInfo,0,dev->nBlocks * sizeof(yaffs_BlockInfo)); + dev->allocationBlock = -1; // force it to get a new one +} + +static void yaffs_DeinitialiseBlocks(yaffs_Device *dev) +{ + YFREE(dev->blockInfo); +} + +// FindDiretiestBlock is used to select the dirtiest block (or close enough) +// for garbage collection. + +static int yaffs_FindDirtiestBlock(yaffs_Device *dev) +{ + + int b = dev->currentDirtyChecker; + + int i; + int dirtiest = -1; + int pagesInUse = 100; // silly big number + + for(i = dev->startBlock; i <= dev->endBlock && pagesInUse > 2 ; i++) + { + b++; + if (b > dev->endBlock) + { + b = dev->startBlock; + } + + if(dev->blockInfo[b].blockState == YAFFS_BLOCK_STATE_FULL && + (dev->blockInfo)[b].pagesInUse < pagesInUse) + { + dirtiest = b; + pagesInUse = (dev->blockInfo)[b].pagesInUse; + } + } + + dev->currentDirtyChecker = b; + + return dirtiest; +} + + +static int yaffs_FindBlockForAllocation(yaffs_Device *dev,int useReserve) +{ + int i; + + if(useReserve && dev->nErasedBlocks < 1) + { + // Hoosterman we've got a problem. + // Can't get space to gc + return -1; + } + else if(!useReserve && dev->nErasedBlocks <= YAFFS_RESERVED_BLOCKS) + { + // We are not in GC, so we hold some in reserve so we can get + // a gc done. + } + + // Find an empty block. + + for(i = dev->startBlock; i <= dev->endBlock; i++) + { + + if(dev->blockInfo[i].blockState == YAFFS_BLOCK_STATE_EMPTY) + { + dev->blockInfo[i].blockState = YAFFS_BLOCK_STATE_ALLOCATING; + dev->nErasedBlocks--; + if(dev->nErasedBlocks <= YAFFS_RESERVED_BLOCKS) + { + dev->garbageCollectionRequired = 1; + } + + return i; + } + } + + return -1; +} + + +static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo) +{ + yaffs_BlockInfo *bi = &dev->blockInfo[blockNo]; + + // Mark as dirty, erase it and mark as clean. + bi->blockState = YAFFS_BLOCK_STATE_DIRTY; + yaffs_EraseBlockInNAND(dev,blockNo); + bi->blockState = YAFFS_BLOCK_STATE_EMPTY; + dev->nErasedBlocks++; + bi->pagesInUse = 0; + bi->pageBits = 0; + + T((TSTR("Erased block %d" TENDSTR),blockNo)); +} + + +static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve) +{ + int retVal; + + if(dev->allocationBlock < 0) + { + // Get next block to allocate off + dev->allocationBlock = yaffs_FindBlockForAllocation(dev,useReserve); + dev->allocationPage = 0; + } + + // Next page please.... + if(dev->allocationBlock >= 0) + { + retVal = (dev->allocationBlock * YAFFS_CHUNKS_PER_BLOCK) + + dev->allocationPage; + dev->blockInfo[dev->allocationBlock].pagesInUse++; + dev->blockInfo[dev->allocationBlock].pageBits |= + (1 << (dev->allocationPage)); + + dev->allocationPage++; + + dev->nFreeChunks--; + + // If the block is full set the state to full + if(dev->allocationPage >= YAFFS_CHUNKS_PER_BLOCK) + { + dev->blockInfo[dev->allocationBlock].blockState = YAFFS_BLOCK_STATE_FULL; + dev->allocationBlock = -1; + } + +#ifdef YAFFS_PARANOID + if(yaffs_CheckChunkErased(dev,retVal) == YAFFS_FAIL) + { + T((TSTR("..................Trying to allocate non-erased page %d" TENDSTR),retVal)); + } +#endif + return retVal; + + } + T((TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR))); + + return -1; +} + + +int yaffs_GarbageCollectBlock(yaffs_Device *dev,int block) +{ + int oldChunk; + int newChunk; + __u32 mask; + + + yaffs_Spare spare; + yaffs_Tags tags; + __u8 buffer[YAFFS_BYTES_PER_CHUNK]; + + yaffs_BlockInfo *bi = &dev->blockInfo[block]; + + yaffs_Object *object; + + //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits)); + + for(mask = 1,oldChunk = block * YAFFS_CHUNKS_PER_BLOCK; + mask && bi->pageBits; + mask <<= 1, oldChunk++ ) + { + if(bi->pageBits & mask) + { + + // This page is in use and needs to be copied off + + dev->nGCCopies++; + + //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk)); + + yaffs_ReadChunkFromNAND(dev,oldChunk,buffer, &spare); + + yaffs_GetTagsFromSpare(&spare,&tags); + tags.serialNumber++; + yaffs_LoadTagsIntoSpare(&spare,&tags); + +#if 0 + newChunk = yaffs_AllocatePage(dev,1); + if(newChunk < 0) + { + return YAFFS_FAIL; + } + + yaffs_WriteChunkToNAND(dev,newChunk, buffer, &spare); + +#else + newChunk = yaffs_WriteNewChunkToNAND(dev, buffer, &spare,1); +#endif + if(newChunk < 0) + { + return YAFFS_FAIL; + } + + object = yaffs_FindObjectByNumber(dev,tags.objectId); + + // Ok, now fix up the Tnodes etc. + + if(tags.chunkId == 0) + { + // It's a header + object->chunkId = newChunk; + } + else + { + // It's a data chunk + yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0); + + } + + yaffs_DeleteChunk(dev,oldChunk); + + } + } + + return YAFFS_OK; +} + +int yaffs_CheckGarbageCollection(yaffs_Device *dev) +{ + int block; + + if(dev->garbageCollectionRequired) + { + dev->garbageCollectionRequired = 0; + block = yaffs_FindDirtiestBlock(dev); + if(block >= 0) + { + return yaffs_GarbageCollectBlock(dev,block); + } + else + { + return YAFFS_FAIL; + } + } + + return YAFFS_OK; +} + + +//////////////////////////// TAGS /////////////////////////////////////// + +static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr) +{ + yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr; + + yaffs_CalcTagsECC(tagsPtr); + + sparePtr->tagByte0 = tu->asBytes[0]; + sparePtr->tagByte1 = tu->asBytes[1]; + sparePtr->tagByte2 = tu->asBytes[2]; + sparePtr->tagByte3 = tu->asBytes[3]; + sparePtr->tagByte4 = tu->asBytes[4]; + sparePtr->tagByte5 = tu->asBytes[5]; + sparePtr->tagByte6 = tu->asBytes[6]; + sparePtr->tagByte7 = tu->asBytes[7]; +} + +static void yaffs_GetTagsFromSpare(yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr) +{ + yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr; + + tu->asBytes[0]= sparePtr->tagByte0; + tu->asBytes[1]= sparePtr->tagByte1; + tu->asBytes[2]= sparePtr->tagByte2; + tu->asBytes[3]= sparePtr->tagByte3; + tu->asBytes[4]= sparePtr->tagByte4; + tu->asBytes[5]= sparePtr->tagByte5; + tu->asBytes[6]= sparePtr->tagByte6; + tu->asBytes[7]= sparePtr->tagByte7; + + yaffs_CheckECCOnTags(tagsPtr); +} + +static void yaffs_SpareInitialise(yaffs_Spare *spare) +{ + memset(spare,0xFF,sizeof(yaffs_Spare)); +} + +static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted) +{ + if(tags) + { + yaffs_Spare spare; + if(yaffs_ReadChunkFromNAND(dev,chunkInNAND,NULL,&spare) == YAFFS_OK) + { + *chunkDeleted = (yaffs_countBits[spare.pageStatus] < 7) ? 1 : 0; + yaffs_GetTagsFromSpare(&spare,tags); + return YAFFS_OK; + } + else + { + return YAFFS_FAIL; + } + } + + return YAFFS_OK; +} + +#if 0 +static int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_Tags *tags) +{ + // NB There must be tags, data is optional + // If there is data, then an ECC is calculated on it. + + yaffs_Spare spare; + + if(!tags) + { + return YAFFS_FAIL; + } + + yaffs_SpareInitialise(&spare); + + + if(buffer) + { + yaffs_CalcECC(buffer,&spare); + } + + yaffs_LoadTagsIntoSpare(&spare,tags); + + return yaffs_WriteChunkToNAND(dev,chunkInNAND,buffer,&spare); + +} +#endif + + +static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_Tags *tags, int useReserve) +{ + // NB There must be tags, data is optional + // If there is data, then an ECC is calculated on it. + + yaffs_Spare spare; + + if(!tags) + { + return YAFFS_FAIL; + } + + yaffs_SpareInitialise(&spare); + + + if(buffer) + { + yaffs_CalcECC(buffer,&spare); + } + + yaffs_LoadTagsIntoSpare(&spare,tags); + + return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve); + +} + +static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted) +{ + return ( tags->chunkId == chunkInObject && + tags->objectId == objectId && + !chunkDeleted) ? 1 : 0; + +} + + + +int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags) +{ + //Get the Tnode, then get the level 0 offset chunk offset + yaffs_Tnode *tn; + int theChunk = -1; + yaffs_Tags localTags; + int i; + int found = 0; + int chunkDeleted; + + yaffs_Device *dev = in->myDev; + + + if(!tags) + { + // Passed a NULL, so use our own tags space + tags = &localTags; + } + + tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); + + if(tn) + { + theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits; + + // Now we need to do the shifting etc and search for it + for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++) + { + yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted); + if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted)) + { + // found it; + found = 1; + } + else + { + theChunk++; + } + } + } + return found ? theChunk : -1; +} + +int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags) +{ + //Get the Tnode, then get the level 0 offset chunk offset + yaffs_Tnode *tn; + int theChunk = -1; + yaffs_Tags localTags; + int i; + int found = 0; + yaffs_Device *dev = in->myDev; + int chunkDeleted; + + if(!tags) + { + // Passed a NULL, so use our own tags space + tags = &localTags; + } + + tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); + + if(tn) + { + + theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits; + + // Now we need to do the shifting etc and search for it + for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++) + { + yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted); + if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted)) + { + // found it; + found = 1; + } + else + { + theChunk++; + } + } + + // Delete the entry in the filestructure + if(found) + { + tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0; + } + } + else + { + //T(("No level 0 found for %d\n", chunkInInode)); + } + + if(!found) + { + //T(("Could not find %d to delete\n",chunkInInode)); + } + return found ? theChunk : -1; +} + + +#if YAFFS_PARANOID + +static int yaffs_CheckFileSanity(yaffs_Object *in) +{ + int chunk; + int nChunks; + int fSize; + int failed = 0; + int objId; + yaffs_Tnode *tn; + yaffs_Tags localTags; + yaffs_Tags *tags = &localTags; + int theChunk; + int chunkDeleted; + + + if(in->variantType != YAFFS_OBJECT_TYPE_FILE) + { + //T(("Object not a file\n")); + return YAFFS_FAIL; + } + + objId = in->objectId; + fSize = in->variant.fileVariant.fileSize; + nChunks = (fSize + YAFFS_BYTES_PER_CHUNK -1)/YAFFS_BYTES_PER_CHUNK; + + for(chunk = 1; chunk <= nChunks; chunk++) + { + tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk); + + if(tn) + { + + theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits; + + + yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted); + if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted)) + { + // found it; + + } + else + { + //T(("File problem file [%d,%d] NAND %d tags[%d,%d]\n", + // objId,chunk,theChunk,tags->chunkId,tags->objectId); + + failed = 1; + + } + + } + else + { + //T(("No level 0 found for %d\n", chunk)); + } + } + + return failed ? YAFFS_FAIL : YAFFS_OK; +} + +#endif + +static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan) +{ + yaffs_Tnode *tn; + yaffs_Device *dev = in->myDev; + int existingChunk; + yaffs_Tags existingTags; + yaffs_Tags newTags; + unsigned existingSerial, newSerial; + + int newChunkDeleted; + + + tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); + if(!tn) + { + return YAFFS_FAIL; + } + + existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK]; + + if(inScan) + { + // If we're scanning then we need to test for duplicates + // NB This does not need to be efficient since it should only ever + // happen when the power fails during a write, then only one + // chunk should ever be affected. + + + if(existingChunk != 0) + { + // NB Right now existing chunk will not be real chunkId if the device >= 32MB + // thus we have to do a FindChunkInFile to get the real chunk id. + // + // We have a duplicate now we need to decide which one to use + // To do this we get both sets of tags and compare serial numbers. + yaffs_ReadChunkTagsFromNAND(dev,chunkInNAND, &newTags,&newChunkDeleted); + + + // Do a proper find + existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags); + + if(existingChunk <=0) + { + //Hoosterman - how did this happen? + // todo + } + + + // NB The deleted flags should be false, otherwise the chunks will + // not be loaded during a scan + + newSerial = newTags.serialNumber; + existingSerial = existingTags.serialNumber; + + if( existingChunk <= 0 || + ((existingSerial+1) & 3) == newSerial) + { + // Use new + // Delete the old one and drop through to update the tnode + yaffs_DeleteChunk(dev,existingChunk); + } + else + { + // Use existing. + // Delete the new one and return early so that the tnode isn't changed + yaffs_DeleteChunk(dev,chunkInNAND); + return YAFFS_OK; + } + } + + } + + if(existingChunk == 0) + { + in->nDataChunks++; + } + + tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits); + + return YAFFS_OK; +} + + + +int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer) +{ + int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL); + + if(chunkInNAND >= 0) + { + return yaffs_ReadChunkFromNAND(in->myDev,chunkInNAND,buffer,NULL); + } + else + { + return 0; + } + +} + + +static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId) +{ + int block = chunkId / YAFFS_CHUNKS_PER_BLOCK; + int page = chunkId % YAFFS_CHUNKS_PER_BLOCK; + yaffs_Spare spare; + + yaffs_SpareInitialise(&spare); + + spare.pageStatus = 0; // To mark it as deleted. + + + yaffs_WriteChunkToNAND(dev,chunkId,NULL,&spare); + + + // Pull out of the management area. + // If the whole block became dirty, this will kick off an erasure. + if( dev->blockInfo[block].blockState == YAFFS_BLOCK_STATE_ALLOCATING || + dev->blockInfo[block].blockState == YAFFS_BLOCK_STATE_FULL) + { + dev->nFreeChunks++; + + dev->blockInfo[block].pageBits &= ~(1 << page); + dev->blockInfo[block].pagesInUse--; + + if( dev->blockInfo[block].pagesInUse == 0 && + dev->blockInfo[block].blockState == YAFFS_BLOCK_STATE_FULL) + { + yaffs_BlockBecameDirty(dev,block); + } + + } + else + { + // T(("Bad news deleting chunk %d\n",chunkId)); + } + +} + + + + +int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve) +{ + // Find old chunk Need to do this to get serial number + // Write new one and patch into tree. + // Invalidate old tags. + + int prevChunkId; + yaffs_Tags prevTags; + + int newChunkId; + yaffs_Tags newTags; + + yaffs_Device *dev = in->myDev; + + yaffs_CheckGarbageCollection(dev); + + // Get the previous chunk at this location in the file if it exists + prevChunkId = yaffs_FindChunkInFile(in,chunkInInode,&prevTags); + + // Set up new tags + newTags.chunkId = chunkInInode; + newTags.objectId = in->objectId; + newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1; + newTags.byteCount = nBytes; + newTags.unusedStuff = 0xFFFFFFFF; + + yaffs_CalcTagsECC(&newTags); + + + #if 0 + // Create new chunk in NAND + newChunkId = yaffs_AllocatePage(dev,useReserve); + + + if(newChunkId >= 0) + { + + + yaffs_WriteChunkWithTagsToNAND(dev,newChunkId,buffer,&newTags); + + yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId); + + + if(prevChunkId >= 0) + { + yaffs_DeleteChunk(dev,prevChunkId); + + } + + yaffs_CheckFileSanity(in); + + return newChunkId; + } + + + return -1; +#else + + newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve); + if(newChunkId >= 0) + { + yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0); + + + if(prevChunkId >= 0) + { + yaffs_DeleteChunk(dev,prevChunkId); + + } + + yaffs_CheckFileSanity(in); + } + return newChunkId; + +#endif + + + +} + + +// UpdateObjectHeader updates the header on NAND for an object. +// If name is not NULL, then that new name is used. +// +int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name) +{ + + yaffs_Device *dev = in->myDev; + + int prevChunkId; + + int newChunkId; + yaffs_Tags newTags; + __u8 bufferNew[YAFFS_BYTES_PER_CHUNK]; + __u8 bufferOld[YAFFS_BYTES_PER_CHUNK]; + + yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)bufferNew; + yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld; + + if(!in->fake) + { + + yaffs_CheckGarbageCollection(dev); + + memset(bufferNew,0xFF,YAFFS_BYTES_PER_CHUNK); + + prevChunkId = in->chunkId; + + if(prevChunkId >= 0) + { + yaffs_ReadChunkFromNAND(dev,prevChunkId,bufferOld,NULL); + } + + // Header data + oh->type = in->variantType; + + oh->st_mode = in->st_mode; + oh->st_uid = in->st_uid; + oh->st_gid = in->st_gid; + oh->st_atime = in->st_atime; + oh->st_mtime = in->st_mtime; + oh->st_ctime = in->st_ctime; + oh->st_rdev = in->st_rdev; + + oh->parentObjectId = in->parent->objectId; + oh->sum = in->sum; + if(name && *name) + { + memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1); + strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH); + } + else + { + memcpy(oh->name, ohOld->name,YAFFS_MAX_NAME_LENGTH + 1); + } + + switch(in->variantType) + { + case YAFFS_OBJECT_TYPE_UNKNOWN: + // Should not happen + break; + case YAFFS_OBJECT_TYPE_FILE: + oh->fileSize = in->variant.fileVariant.fileSize; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId; + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + // Do nothing + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + // Do nothing + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH); + oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; + break; + } + + // Tags + in->serial++; + newTags.chunkId = 0; + newTags.objectId = in->objectId; + newTags.serialNumber = in->serial; + newTags.byteCount = 0xFFFFFFFF; + newTags.unusedStuff = 0xFFFFFFFF; + + yaffs_CalcTagsECC(&newTags); + + + +#if 0 + // Create new chunk in NAND + newChunkId = yaffs_AllocatePage(dev,1); + + if(newChunkId >= 0) + { + + yaffs_WriteChunkWithTagsToNAND(dev,newChunkId,bufferNew,&newTags); + + in->chunkId = newChunkId; + + if(prevChunkId >= 0) + { + yaffs_DeleteChunk(dev,prevChunkId); + } + + in->dirty = 0; + return newChunkId; + } + + return -1; +#else + // Create new chunk in NAND + newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,bufferNew,&newTags,1); + + if(newChunkId >= 0) + { + + in->chunkId = newChunkId; + + if(prevChunkId >= 0) + { + yaffs_DeleteChunk(dev,prevChunkId); + } + + in->dirty = 0; + } + + return newChunkId; + +#endif + } + return 0; +} + + + +///////////////////////// File read/write /////////////////////////////// +// Read and write have very similar structures. +// In general the read/write has three parts to it +// * An incomplete chunk to start with (if the read/write is not chunk-aligned) +// * Some complete chunks +// * An incomplete chunk to end off with +// +// Curve-balls: the first chunk might also be the last chunk. + +int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes) +{ + +// yaffs_Device *dev = in->myDev; + + __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; + + int chunk; + int start; + int nToCopy; + int n = nBytes; + int nDone = 0; + + while(n > 0) + { + chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; // The first chunk is 1 + start = offset % YAFFS_BYTES_PER_CHUNK; + + // OK now check for the curveball where the start and end are in + // the same chunk. + if( (start + n) < YAFFS_BYTES_PER_CHUNK) + { + nToCopy = n; + } + else + { + nToCopy = YAFFS_BYTES_PER_CHUNK - start; + } + + if(nToCopy != YAFFS_BYTES_PER_CHUNK) + { + // An incomplete start or end chunk (or maybe both start and end chunk) + // Read into the local buffer then copy... + + yaffs_ReadChunkDataFromObject(in,chunk,localBuffer); + memcpy(buffer,&localBuffer[start],nToCopy); + } + else + { + // A full chunk. Read directly into the supplied buffer. + yaffs_ReadChunkDataFromObject(in,chunk,buffer); + } + + n -= nToCopy; + offset += nToCopy; + buffer += nToCopy; + nDone += nToCopy; + + } + + return nDone; +} + + +int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes) +{ + __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; + + int chunk; + int start; + int nToCopy; + int n = nBytes; + int nDone = 0; + int nToWriteBack; + int endOfWrite = offset+nBytes; + int chunkWritten = 0; + + while(n > 0 && chunkWritten >= 0) + { + chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; + start = offset % YAFFS_BYTES_PER_CHUNK; + + + // OK now check for the curveball where the start and end are in + // the same chunk. + if( (start + n) < YAFFS_BYTES_PER_CHUNK) + { + nToCopy = n; + nToWriteBack = (start + n); + } + else + { + nToCopy = YAFFS_BYTES_PER_CHUNK - start; + nToWriteBack = YAFFS_BYTES_PER_CHUNK; + } + + if(nToCopy != YAFFS_BYTES_PER_CHUNK) + { + // An incomplete start or end chunk (or maybe both start and end chunk) + // Read into the local buffer then copy, then copy over and write back. + + yaffs_ReadChunkDataFromObject(in,chunk,localBuffer); + + memcpy(&localBuffer[start],buffer,nToCopy); + + chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,nToWriteBack,0); + + //T(("Write with readback to chunk %d %d\n",chunk,chunkWritten)); + + } + else + { + // A full chunk. Write directly from the supplied buffer. + chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,YAFFS_BYTES_PER_CHUNK,0); + //T(("Write to chunk %d %d\n",chunk,chunkWritten)); + } + + if(chunkWritten >= 0) + { + n -= nToCopy; + offset += nToCopy; + buffer += nToCopy; + nDone += nToCopy; + } + + } + + // Update file object + + if(endOfWrite > in->variant.fileVariant.fileSize) + { + in->variant.fileVariant.fileSize = endOfWrite; + } + + in->dirty = 1; + /*in->st_mtime = CURRENT_TIME; only update in flush*/ + + return nDone; +} + + +int yaffs_ResizeFile(yaffs_Object *in, int newSize) +{ + int i; + int chunkId; + int oldFileSize = in->variant.fileVariant.fileSize; + int sizeOfPartialChunk = newSize % YAFFS_BYTES_PER_CHUNK; + + yaffs_Device *dev = in->myDev; + + __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; + + if(in->variantType != YAFFS_OBJECT_TYPE_FILE) + { + return yaffs_GetFileSize(in); + } + + if(newSize < oldFileSize) + { + + int lastDel = 1 + (oldFileSize-1)/YAFFS_BYTES_PER_CHUNK; + + int startDel = 1 + (newSize + YAFFS_BYTES_PER_CHUNK - 1)/ + YAFFS_BYTES_PER_CHUNK; + + // Delete backwards so that we don't end up with holes if + // power is lost part-way through the operation. + for(i = lastDel; i >= startDel; i--) + { + // NB this could be optimised somewhat, + // eg. could retrieve the tags and write them without + // using yaffs_DeleteChunk + + chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL); + if(chunkId <= 0 || chunkId >= (dev->endBlock * 32)) + { + //T(("Found daft chunkId %d for %d\n",chunkId,i)); + } + else + { + in->nDataChunks--; + yaffs_DeleteChunk(dev,chunkId); + } + } + + + if(sizeOfPartialChunk != 0) + { + int lastChunk = 1+ newSize/YAFFS_BYTES_PER_CHUNK; + + // Got to read and rewrite the last chunk with its new size. + yaffs_ReadChunkDataFromObject(in,lastChunk,localBuffer); + + yaffs_WriteChunkDataToObject(in,lastChunk,localBuffer,sizeOfPartialChunk,1); + + } + + in->variant.fileVariant.fileSize = newSize; + + yaffs_PruneFileStructure(dev,&in->variant.fileVariant); + + return newSize; + + } + else + { + return oldFileSize; + } +} + + +loff_t yaffs_GetFileSize(yaffs_Object *obj) +{ + obj = yaffs_GetEquivalentObject(obj); + + switch(obj->variantType) + { + case YAFFS_OBJECT_TYPE_FILE: + return obj->variant.fileVariant.fileSize; + case YAFFS_OBJECT_TYPE_SYMLINK: + return strlen(obj->variant.symLinkVariant.alias); + default: + return 0; + } +} + + + +// yaffs_FlushFile() updates the file's +// objectId in NAND + +int yaffs_FlushFile(yaffs_Object *in) +{ + int retVal; + if(in->dirty) + { + //T(("flushing object header\n")); + + in->st_mtime = CURRENT_TIME; + + retVal = yaffs_UpdateObjectHeader(in,NULL); + } + else + { + retVal = YAFFS_OK; + } + + return retVal; + +} + + +static int yaffs_DoGenericObjectDeletion(yaffs_Object *in) +{ + yaffs_RemoveObjectFromDirectory(in); + yaffs_DeleteChunk(in->myDev,in->chunkId); + yaffs_FreeObject(in); + return YAFFS_OK; + +} + +// yaffs_DeleteFile deletes the whole file data +// and the inode associated with the file. +// It does not delete the links associated with the file. +static int yaffs_DeleteFile(yaffs_Object *in) +{ + // Delete the file data & tnodes +#if 0 + yaffs_ResizeFile(in,0); +#else + yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0); + +#endif + + yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top); + + return yaffs_DoGenericObjectDeletion(in); +} + +static int yaffs_DeleteDirectory(yaffs_Object *in) +{ + //First check that the directory is empty. + if(list_empty(&in->variant.directoryVariant.children)) + { + return yaffs_DoGenericObjectDeletion(in); + } + + return YAFFS_FAIL; + +} + +static int yaffs_DeleteSymLink(yaffs_Object *in) +{ + YFREE(in->variant.symLinkVariant.alias); + + return yaffs_DoGenericObjectDeletion(in); +} + +static int yaffs_DeleteHardLink(yaffs_Object *in) +{ + // remove this hardlink from the list assocaited with the equivalent + // object + list_del(&in->hardLinks); + return yaffs_DoGenericObjectDeletion(in); +} + + +static int yaffs_UnlinkWorker(yaffs_Object *obj) +{ + + + if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) + { + return yaffs_DeleteHardLink(obj); + } + else if(!list_empty(&obj->hardLinks)) + { +#if 0 + // Curve ball: We're unlinking an object that has a hardlink. + // Therefore we can't really delete the object. + // Instead, we do the following: + // - Select a hardlink. + // - Re-type a hardlink as the equivalent object and populate the fields, including the + // objectId. Updating the object id is important so that all the hardlinks do not need + // to be rewritten. + // - Update the equivalet object pointers. + // - Delete all object. + + yaffs_Object *hl; + struct list_head *i; + + + yaffs_RemoveObjectFromDirectory(obj); + + + + hl = list_entry(obj->hardLinks.next, yaffs_Object,hardLinks); + + hl->dirty = 1; + hl->st_mode = obj->st_mode; + hl->st_uid = obj->st_uid; + hl->st_gid = obj->st_gid; + hl->st_atime = obj->st_atime; + hl->st_mtime = obj->st_mtime; + hl->st_ctime = obj->st_ctime; + hl->st_rdev = obj->st_rdev; + + hl->variantType = obj->variantType; + + switch(hl->variantType) + { + case YAFFS_OBJECT_TYPE_FILE: + case YAFFS_OBJECT_TYPE_SYMLINK: + case YAFFS_OBJECT_TYPE_SPECIAL: + // These types are OK to just copy across. + hl->variant = obj->variant; + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + // Fix the list up + list_add(&hl->variant.directoryVariant.children, + &obj->variant.directoryVariant.children); + list_del(&obj->variant.directoryVariant.children); + + // Now change all the directory children to point to the new parent. + list_for_each(i,&hl->variant.directoryVariant.children) + { + list_entry(i,yaffs_Object,siblings)->parent = hl; + } + break; + + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_UNKNOWN: + // Should not be either of these types. + } + + // Now fix up the hardlink chain + list_del(&obj->hardLinks); + + list_for_each(i,&hl->hardLinks) + { + list_entry(i,yaffs_Object,hardLinks)->variant.hardLinkVariant.equivalentObject = hl; + list_entry(i,yaffs_Object,hardLinks)->variant.hardLinkVariant.equivalentObjectId = hl->objectId; + } + + // Now fix up the hash links. + yaffs_UnhashObject(hl); + hl->objectId = obj->objectId; + yaffs_HashObject(hl); + + // Update the hardlink which has become an object + yaffs_UpdateObjectHeader(hl,NULL); + + // Finally throw away the deleted object + yaffs_DeleteChunk(obj->myDev,obj->chunkId); + yaffs_FreeObject(obj); + + return YAFFS_OK; +#else + // Curve ball: We're unlinking an object that has a hardlink. + // + // This problem arises because we are not strictly following + // The Linux link/inode model. + // + // We can't really delete the object. + // Instead, we do the following: + // - Select a hardlink. + // - Unhook it from the hard links + // - Unhook it from its parent directory (so that the rename can work) + // - Rename the object to the hardlink's name. + // - Delete the hardlink + + + yaffs_Object *hl; + int retVal; + char name[YAFFS_MAX_NAME_LENGTH+1]; + + hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks); + + list_del_init(&hl->hardLinks); + list_del_init(&hl->siblings); + + yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1); + + retVal = yaffs_ChangeObjectName(obj, hl->parent, name); + + if(retVal == YAFFS_OK) + { + retVal = yaffs_DoGenericObjectDeletion(hl); + } + return retVal; + +#endif + + + } + else + { + switch(obj->variantType) + { + case YAFFS_OBJECT_TYPE_FILE: + return yaffs_DeleteFile(obj); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + return yaffs_DeleteDirectory(obj); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + return yaffs_DeleteSymLink(obj); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_UNKNOWN: + default: + return YAFFS_FAIL; + } + } +} + +int yaffs_Unlink(yaffs_Object *dir, const char *name) +{ + yaffs_Object *obj; + + obj = yaffs_FindObjectByName(dir,name); + + if(obj && obj->unlinkAllowed) + { + return yaffs_UnlinkWorker(obj); + } + + return YAFFS_FAIL; + +} + +//////////////// Initialisation Scanning ///////////////// + + + +// For now we use the SmartMedia check. +// We look at the blockStatus byte in the first two chunks +// These must be 0xFF to pass as OK. +// todo: this function needs to be modifyable foir different NAND types +// and different chunk sizes. Suggest make this into a per-device configurable +// function. +static int yaffs_IsBlockBad(yaffs_Device *dev, int blk) +{ + yaffs_Spare spare; + + yaffs_ReadChunkFromNAND(dev,blk * YAFFS_CHUNKS_PER_BLOCK,NULL,&spare); + if(spare.blockStatus != 0xFF) + { + return 1; + } + yaffs_ReadChunkFromNAND(dev,blk * YAFFS_CHUNKS_PER_BLOCK + 1,NULL,&spare); + if(spare.blockStatus != 0xFF) + { + return 1; + } + + return 0; + +} + +static int yaffs_Scan(yaffs_Device *dev) +{ + yaffs_Spare spare; + yaffs_Tags tags; + int blk; + int chunk; + int c; + int deleted; + yaffs_BlockState state; + yaffs_Object *hardList = NULL; + yaffs_Object *hl; + + + + yaffs_ObjectHeader *oh; + yaffs_Object *in; + yaffs_Object *parent; + + __u8 chunkData[YAFFS_BYTES_PER_CHUNK]; + + + // Scan all the blocks... + + for(blk = dev->startBlock; blk <= dev->endBlock; blk++) + { + deleted = 0; + dev->blockInfo[blk].pageBits = 0; + dev->blockInfo[blk].pagesInUse = 0; + state = YAFFS_BLOCK_STATE_SCANNING; + + + if(yaffs_IsBlockBad(dev,blk)) + { + state = YAFFS_BLOCK_STATE_DEAD; + T((TSTR("block %d is bad" TENDSTR),blk)); + } + + // Read each chunk in the block. + + for(c = 0; c < YAFFS_CHUNKS_PER_BLOCK && + state == YAFFS_BLOCK_STATE_SCANNING; c++) + { + // Read the spare area and decide what to do + chunk = blk * YAFFS_CHUNKS_PER_BLOCK + c; + + yaffs_ReadChunkFromNAND(dev,chunk,NULL,&spare); + + + // This block looks ok, now what's in this chunk? + yaffs_GetTagsFromSpare(&spare,&tags); + + if(yaffs_countBits[spare.pageStatus] < 6) + { + // A deleted chunk + deleted++; + dev->nFreeChunks ++; + //T((" %d %d deleted\n",blk,c)); + } + else if(tags.objectId == YAFFS_UNUSED_OBJECT_ID) + { + // An unassigned chunk in the block + // This means that either the block is empty or + // this is the one being allocated from + + if(c == 0) + { + // the block is unused + state = YAFFS_BLOCK_STATE_EMPTY; + dev->nErasedBlocks++; + } + else + { + // this is the block being allocated from + T((TSTR(" Allocating from %d %d" TENDSTR),blk,c)); + state = YAFFS_BLOCK_STATE_ALLOCATING; + dev->allocationBlock = blk; + dev->allocationPage = c; + } + + dev->nFreeChunks += (YAFFS_CHUNKS_PER_BLOCK - c); + } + else if(tags.chunkId > 0) + { + int endpos; + // A data chunk. + dev->blockInfo[blk].pageBits |= (1 << c); + dev->blockInfo[blk].pagesInUse++; + + in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE); + // PutChunkIntoFIle checks for a clash (two data chunks with + // the same chunkId). + yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1); + endpos = (tags.chunkId - 1)* YAFFS_BYTES_PER_CHUNK + tags.byteCount; + if(in->variant.fileVariant.scannedFileSize variant.fileVariant.scannedFileSize = endpos; + } + //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); + } + else + { + // chunkId == 0, so it is an ObjectHeader. + // Thus, we read in the object header and make the object + dev->blockInfo[blk].pageBits |= (1 << c); + dev->blockInfo[blk].pagesInUse++; + + yaffs_ReadChunkFromNAND(dev,chunk,chunkData,NULL); + + oh = (yaffs_ObjectHeader *)chunkData; + + in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type); + + if(in->valid) + { + // We have already filled this one. We have a duplicate and need to resolve it. + + unsigned existingSerial = in->serial; + unsigned newSerial = tags.serialNumber; + + if(((existingSerial+1) & 3) == newSerial) + { + // Use new one - destroy the exisiting one + yaffs_DeleteChunk(dev,in->chunkId); + in->valid = 0; + } + else + { + // Use existing - destroy this one. + yaffs_DeleteChunk(dev,chunk); + } + } + + if(!in->valid) + { + // we need to load this info + + in->valid = 1; + in->variantType = oh->type; + + in->st_mode = oh->st_mode; + in->st_uid = oh->st_uid; + in->st_gid = oh->st_gid; + in->st_atime = oh->st_atime; + in->st_mtime = oh->st_mtime; + in->st_ctime = oh->st_ctime; + in->st_rdev = oh->st_rdev; + in->chunkId = chunk; + + in->sum = oh->sum; + in->dirty = 0; + + // directory stuff... + // hook up to parent + + parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY); + if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN) + { + // Set up as a directory + parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY; + INIT_LIST_HEAD(&parent->variant.directoryVariant.children); + } + else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) + { + // Hoosterman, another problem.... + // We're trying to use a non-directory as a directory + // Todo ... handle + } + + yaffs_AddObjectToDirectory(parent,in); + + // Note re hardlinks. + // Since we might scan a hardlink before its equivalent object is scanned + // we put them all in a list. + // After scanning is complete, we should have all the objects, so we run through this + // list and fix up all the chains. + + switch(in->variantType) + { + case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem + break; + case YAFFS_OBJECT_TYPE_FILE: + in->variant.fileVariant.fileSize = oh->fileSize; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId; + (yaffs_Object *)(in->hardLinks.next) = hardList; + hardList = in; + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing + break; + case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing + break; + case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing + in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias); + break; + } + //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType)); + } + } + } + + if(state == YAFFS_BLOCK_STATE_SCANNING) + { + // If we got this far while scanning, then the block is fully allocated. + state = YAFFS_BLOCK_STATE_FULL; + } + + dev->blockInfo[blk].blockState = state; + + // Now let's see if it was dirty + if( dev->blockInfo[blk].pagesInUse == 0 && + dev->blockInfo[blk].blockState == YAFFS_BLOCK_STATE_FULL) + { + yaffs_BlockBecameDirty(dev,blk); + } + + } + + // Fix up the hard link chains. + // We should now have scanned all the objects, now it's time to add these + // hardlinks. + while(hardList) + { + hl = hardList; + hardList = (yaffs_Object *)(hardList->hardLinks.next); + + in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId); + + if(in) + { + // Add the hardlink pointers + hl->variant.hardLinkVariant.equivalentObject=in; + list_add(&hl->hardLinks,&in->hardLinks); + } + else + { + //Todo Need to report/handle this better. + // Got a problem... hardlink to a non-existant object + hl->variant.hardLinkVariant.equivalentObject=NULL; + INIT_LIST_HEAD(&hl->hardLinks); + + } + + } + + + + return YAFFS_OK; +} + + +////////////////////////// Directory Functions ///////////////////////// + + +static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj) +{ + + if(obj->siblings.prev == NULL) + { + // Not initialised + INIT_LIST_HEAD(&obj->siblings); + + } + else if(!list_empty(&obj->siblings)) + { + // If it is holed up somewhere else, un hook it + list_del_init(&obj->siblings); + } + // Now add it + list_add(&obj->siblings,&directory->variant.directoryVariant.children); + obj->parent = directory; +} + +static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj) +{ + list_del_init(&obj->siblings); + obj->parent = NULL; +} + +yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const char *name) +{ + int sum; + + struct list_head *i; + char buffer[YAFFS_MAX_NAME_LENGTH+1]; + + yaffs_Object *l; + + sum = yaffs_CalcNameSum(name); + + list_for_each(i,&directory->variant.directoryVariant.children) + { + l = list_entry(i, yaffs_Object,siblings); + + // Special case for lost-n-found + if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND) + { + if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0) + { + return l; + } + } + else if(yaffs_SumCompare(l->sum, sum)) + { + // Do a real check + yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH); + if(yaffs_strcmp(name,buffer) == 0) + { + return l; + } + + + } + } + + return NULL; +} + + +int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *)) +{ + struct list_head *i; + yaffs_Object *l; + + + list_for_each(i,&theDir->variant.directoryVariant.children) + { + l = list_entry(i, yaffs_Object,siblings); + if(!fn(l)) + { + return YAFFS_FAIL; + } + } + + return YAFFS_OK; + +} + + +// GetEquivalentObject dereferences any hard links to get to the +// actual object. + +yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj) +{ + if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) + { + // We want the object id of the equivalent object, not this one + obj = obj->variant.hardLinkVariant.equivalentObject; + } + return obj; + +} + +int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize) +{ + memset(name,0,buffSize); + + if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) + { + strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1); + } + else if(obj->chunkId <= 0) + { + char locName[20]; + // make up a name + sprintf(locName,"%s%d",YAFFS_LOSTNFOUND_PREFIX,obj->objectId); + strncpy(name,locName,buffSize - 1); + + } + else + { + __u8 buffer[YAFFS_BYTES_PER_CHUNK]; + yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer; + + memset(buffer,0,YAFFS_BYTES_PER_CHUNK); + + if(obj->chunkId >= 0) + { + yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL); + } + strncpy(name,oh->name,buffSize - 1); + } + + return strlen(name); +} + +int yaffs_GetObjectFileLength(yaffs_Object *obj) +{ + + // Dereference any hard linking + obj = yaffs_GetEquivalentObject(obj); + + if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) + { + return obj->variant.fileVariant.fileSize; + } + if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) + { + return strlen(obj->variant.symLinkVariant.alias); + } + else + { + // Only a directory should drop through to here + return YAFFS_BYTES_PER_CHUNK; + } +} + +int yaffs_GetObjectLinkCount(yaffs_Object *obj) +{ + int count = 1; // the object itself + struct list_head *i; + + list_for_each(i,&obj->hardLinks) + { + count++; + } + return count; + +} + + +int yaffs_GetObjectInode(yaffs_Object *obj) +{ + obj = yaffs_GetEquivalentObject(obj); + + return obj->objectId; +} + +unsigned yaffs_GetObjectType(yaffs_Object *obj) +{ + obj = yaffs_GetEquivalentObject(obj); + + switch(obj->variantType) + { + case YAFFS_OBJECT_TYPE_FILE: return DT_REG; break; + case YAFFS_OBJECT_TYPE_DIRECTORY: return DT_DIR; break; + case YAFFS_OBJECT_TYPE_SYMLINK: return DT_LNK; break; + case YAFFS_OBJECT_TYPE_HARDLINK: return DT_REG; break; + case YAFFS_OBJECT_TYPE_SPECIAL: + if(S_ISFIFO(obj->st_mode)) return DT_FIFO; + if(S_ISCHR(obj->st_mode)) return DT_CHR; + if(S_ISBLK(obj->st_mode)) return DT_BLK; + if(S_ISSOCK(obj->st_mode)) return DT_SOCK; + default: return DT_REG; break; + } +} + +char *yaffs_GetSymlinkAlias(yaffs_Object *obj) +{ + obj = yaffs_GetEquivalentObject(obj); + if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) + { + return yaffs_CloneString(obj->variant.symLinkVariant.alias); + } + else + { + return yaffs_CloneString(""); + } +} + + +int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr) +{ + unsigned int valid = attr->ia_valid; + + if(valid & ATTR_MODE) obj->st_mode = attr->ia_mode; + if(valid & ATTR_UID) obj->st_uid = attr->ia_uid; + if(valid & ATTR_GID) obj->st_gid = attr->ia_gid; + + if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime; + if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime; + if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime; + + if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size); + + yaffs_UpdateObjectHeader(obj,NULL); + + return YAFFS_OK; + +} +int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr) +{ + unsigned int valid = 0; + + attr->ia_mode = obj->st_mode; valid |= ATTR_MODE; + attr->ia_uid = obj->st_uid; valid |= ATTR_UID; + attr->ia_gid = obj->st_gid; valid |= ATTR_GID; + + attr->ia_atime = obj->st_atime; valid |= ATTR_ATIME; + attr->ia_ctime = obj->st_ctime; valid |= ATTR_CTIME; + attr->ia_mtime = obj->st_mtime; valid |= ATTR_MTIME; + + attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE; + + attr->ia_valid = valid; + + return YAFFS_OK; + +} + + + +int yaffs_DumpObject(yaffs_Object *obj) +{ +// __u8 buffer[YAFFS_BYTES_PER_CHUNK]; + char name[257]; +// yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer; + +// memset(buffer,0,YAFFS_BYTES_PER_CHUNK); + +// if(obj->chunkId >= 0) +// { +// yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL); +// } + + yaffs_GetObjectName(obj,name,256); + + YPRINTF(("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n", + obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial, + obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj))); + +#if 0 + YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n", + obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial, + obj->sum, obj->chunkId)); + switch(obj->variantType) + { + case YAFFS_OBJECT_TYPE_FILE: + YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize)); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + YPRINTF((" DIRECTORY\n")); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: //todo + case YAFFS_OBJECT_TYPE_SYMLINK: + case YAFFS_OBJECT_TYPE_UNKNOWN: + default: + } +#endif + + return YAFFS_OK; +} + + +///////////////////////// Initialisation code /////////////////////////// + + + +int yaffs_GutsInitialise(yaffs_Device *dev) +{ + unsigned nChunks,x; + int bits; + + + dev = dev; + + if(!yaffs_CheckStructures()) + { + return YAFFS_FAIL; + } + + + // OK now calculate a few things for the device + // Calculate chunkGroupBits. + // If there are 64k or less chunks then this is 1 + // Else it is log2(nChunks) - 16 + // + x = nChunks = YAFFS_CHUNKS_PER_BLOCK * dev->nBlocks; + + for(bits = 0, x = nChunks; (x & 1) == 0; bits++) + { + x >>= 1; + } + + if( x != 1) + { + // Not a power of 2 + YPRINTF(("nBlocks should be a power of 2 but is %u\n", + dev->nBlocks)); + return YAFFS_FAIL; + } + + if(bits <= 16) + { + dev->chunkGroupBits = 0; + dev->chunkGroupSize = 1; + } + else + { + dev->chunkGroupBits = bits - 16; + dev->chunkGroupSize = nChunks/0x10000; + } + + // More device initialisation + dev->garbageCollectionRequired = 0; + dev->currentDirtyChecker = 0; + + yaffs_InitialiseBlocks(dev); + + yaffs_InitialiseTnodes(dev); + + yaffs_InitialiseObjects(dev); + + + // Initialise the root and lost and found directories + dev->lostNFoundDir = dev->rootDir = NULL; + dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR); + dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_ROOT_MODE | S_IFDIR); + yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir); + + // Now scan the flash. + yaffs_Scan(dev); + + // Zero out stats + dev->nPageReads = 0; + dev->nPageWrites = 0; + dev->nBlockErasures = 0; + dev->nGCCopies = 0; + dev->nRetriedWrites = 0; + + + return YAFFS_OK; + +} + +void yaffs_Deinitialise(yaffs_Device *dev) +{ + yaffs_DeinitialiseBlocks(dev); + yaffs_DeinitialiseTnodes(dev); + yaffs_DeinitialiseObjects(dev); + +} + +int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev) +{ + int nFree = dev->nFreeChunks - (YAFFS_CHUNKS_PER_BLOCK * YAFFS_RESERVED_BLOCKS); + + return (nFree < 0) ? 0 : nFree; + +} + + +/////////////////// YAFFS test code ////////////////////////////////// + +#define yaffs_CheckStruct(structure,syze, name) \ + if(sizeof(structure) != syze) \ + { YPRINTF(("%s should be %d but is %d\n",name,syze,sizeof(structure))); \ + return YAFFS_FAIL; \ + } + + +static int yaffs_CheckStructures(void) +{ + yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") + yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") + yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") + yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode") + yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader") + + + return YAFFS_OK; +} + +void yaffs_GutsTest(yaffs_Device *dev) +{ + + if(yaffs_CheckStructures() != YAFFS_OK) + { + YPRINTF(("One or more structures malformed-- aborting\n")); + return; + } + else + { + YPRINTF(("Structures OK\n")); + } + + yaffs_TnodeTest(dev); + yaffs_ObjectTest(dev); +} + + diff --git a/yaffs_guts.h b/yaffs_guts.h index 3ae36e7..d37ac44 100644 --- a/yaffs_guts.h +++ b/yaffs_guts.h @@ -1,444 +1,466 @@ -/* - * YAFFS: Yet another FFS. A NAND-flash specific file system. - * yaffs_guts.h: Configuration etc for yaffs_guts - * - * Copyright (C) 2002 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 General Public License version 2 as - * published by the Free Software Foundation. - * - */ - -#ifndef __YAFFS_GUTS_H__ -#define __YAFFS_GUTS_H__ - -#include "devextras.h" - - -#define YAFFS_OK 1 -#define YAFFS_FAIL 0 - -// Y=0x59, A=0x41, S=0x53 -#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 - -#define YAFFS_BYTES_PER_CHUNK 512 -#define YAFFS_CHUNK_SIZE_SHIFT 9 - -#define YAFFS_BYTES_PER_SPARE 16 - -#define YAFFS_CHUNKS_PER_BLOCK 32 -#define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK) - -#define YAFFS_MAX_CHUNK_ID 0x000FFFFF - -#define YAFFS_UNUSED_OBJECT_ID 0x0003FFFF - -#define YAFFS_ALLOCATION_NOBJECTS 100 -#define YAFFS_ALLOCATION_NTNODES 100 -#define YAFFS_ALLOCATION_NLINKS 100 - -#define YAFFS_NOBJECT_BUCKETS 256 - - -#define YAFFS_RESERVED_BLOCKS 5 - -#define YAFFS_OBJECT_SPACE 0x40000 -#define YAFFS_MAX_NAME_LENGTH 255 - -#define YAFFS_MAX_ALIAS_LENGTH 211 - -#define YAFFS_OBJECTID_ROOT 1 -#define YAFFS_ROOT_MODE 0666 -#define YAFFS_OBJECTID_LOSTNFOUND 2 -#define YAFFS_LOSTNFOUND_NAME "lost+found" - -// Tags structures in RAM -// NB This uses bitfield. Bitfields should not stradle a u32 boundary otherwise -// the structure size will get blown out. - -typedef struct -{ - unsigned chunkId:20; - unsigned serialNumber:2; - unsigned byteCount:10; - unsigned objectId:18; - unsigned ecc:12; - unsigned unusedStuff:2; -} yaffs_Tags; - -typedef union -{ - yaffs_Tags asTags; - __u8 asBytes[8]; -} yaffs_TagsUnion; - - -// Spare structure -typedef struct -{ - __u8 tagByte0; - __u8 tagByte1; - __u8 tagByte2; - __u8 tagByte3; - __u8 pageStatus; // Currently unused, but sort of set aside to distinguish - // unused - vs- used -vs- deleted chunks. We achieve this by - // using the objectId tags. - __u8 blockStatus; - __u8 tagByte4; - __u8 tagByte5; - __u8 ecc1[3]; - __u8 tagByte6; - __u8 tagByte7; - __u8 ecc2[3]; -} yaffs_Spare; - -// Block data in RAM - -typedef enum { - YAFFS_BLOCK_STATE_UddNKNOWN = 0, - YAFFS_BLOCK_STATE_SCANNING, // Used while the block is being scanned. - // NB Don't erase blocks while they're being scanned - - YAFFS_BLOCK_STATE_EMPTY, // This block is empty - - YAFFS_BLOCK_STATE_ALLOCATING, // This block is partially allocated. - // This is the one currently being used for page - // allocation. Should never be more than one of these - - - YAFFS_BLOCK_STATE_FULL, // All the pages in this block have been allocated. - // At least one page holds valid data. - - YAFFS_BLOCK_STATE_DIRTY, // All pages have been allocated and deleted. - // Erase me, reuse me. - - YAFFS_BLOCK_STATE_DEAD = 0x99 // This block has failed and is not in use - -} yaffs_BlockState; - - - - -typedef struct -{ - __u32 pageBits; // bitmap of pages in use - __u8 blockState; // One of the above block states - __u8 pagesInUse; // number of pages in use -} yaffs_BlockInfo; - - -//////////////////// Object structure /////////////////////////// -// This is the object structure as stored on NAND - -typedef enum -{ - YAFFS_OBJECT_TYPE_UNKNOWN, - YAFFS_OBJECT_TYPE_FILE, - YAFFS_OBJECT_TYPE_SYMLINK, - YAFFS_OBJECT_TYPE_DIRECTORY, - YAFFS_OBJECT_TYPE_HARDLINK -} yaffs_ObjectType; - -typedef struct -{ - yaffs_ObjectType type; - - // Apply to everything - int parentObjectId; - __u16 sum; // checksum of name - char name[YAFFS_MAX_NAME_LENGTH + 1]; - - // Thes following apply to directories, files, symlinks - not hard links - __u32 st_mode; // protection - __u32 st_uid; // user ID of owner - __u32 st_gid; // group ID of owner - __u32 st_atime; // time of last access - __u32 st_mtime; // time of last modification - __u32 st_ctime; // time of last change - - // File size applies to files only - int fileSize; - - // Equivalent object id applies to hard links only. - int equivalentObjectId; - char alias[YAFFS_MAX_ALIAS_LENGTH + 1]; - - -} yaffs_ObjectHeader; - - - -//////////////////// Tnode /////////////////////////// - -union yaffs_Tnode_union -{ - union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL]; - __u16 level0[YAFFS_NTNODES_LEVEL0]; - -}; - -typedef union yaffs_Tnode_union yaffs_Tnode; - -struct yaffs_TnodeList_struct -{ - struct yaffs_TnodeList_struct *next; - yaffs_Tnode *tnodes; -}; - -typedef struct yaffs_TnodeList_struct yaffs_TnodeList; - - - -/////////////////// 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 fileSize; - __u32 topLevel; - yaffs_Tnode *top; -} yaffs_FileStructure; - -typedef struct -{ - struct list_head children; // list of child links -} yaffs_DirectoryStructure; - -typedef struct -{ - char *alias; -} yaffs_SymLinkStructure; - -typedef struct -{ - struct yaffs_ObjectStruct *equivalentObject; - __u32 equivalentObjectId; -} yaffs_HardLinkStructure; - -typedef union -{ - yaffs_FileStructure fileVariant; - yaffs_DirectoryStructure directoryVariant; - yaffs_SymLinkStructure symLinkVariant; - yaffs_HardLinkStructure hardLinkVariant; -} yaffs_ObjectVariant; - - -struct yaffs_ObjectStruct -{ - __u8 fake:1; // A fake object has no presence on NAND. - __u8 renameAllowed:1; - __u8 unlinkAllowed: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 serial; // serial number of chunk in NAND. Store here so we don't have to - // read back the old one to update. - __u16 sum; // sum of the name to speed searching - - struct yaffs_DeviceStruct *myDev; // The device I'm on - - - struct list_head hashLink; // list of objects in this hash bucket - - - struct list_head hardLinks; // all the equivalent hard linked objects - // live on this list - // directory structure stuff - struct yaffs_ObjectStruct *parent; //my parent directory - struct list_head siblings; // siblings in a directory - // also used for linking up the free list - - // Where's my data in NAND? - int chunkId; // where it lives - - __u32 objectId; // the object id value - - - __u32 st_mode; // protection - __u32 st_uid; // user ID of owner - __u32 st_gid; // group ID of owner - __u32 st_atime; // time of last access - __u32 st_mtime; // time of last modification - __u32 st_ctime; // time of last change - - - yaffs_ObjectType variantType; - - yaffs_ObjectVariant variant; - -}; - - - -typedef struct yaffs_ObjectStruct yaffs_Object; - - -struct yaffs_ObjectList_struct -{ - yaffs_Object *objects; - struct yaffs_ObjectList_struct *next; -}; - -typedef struct yaffs_ObjectList_struct yaffs_ObjectList; - -typedef struct -{ - struct list_head list; - __u32 count; -} yaffs_ObjectBucket; - - -//////////////////// Device //////////////////////////////// - -struct yaffs_DeviceStruct -{ - // Entry parameters set up way early. Yaffs sets up the rest. - __u32 nBlocks; // Size of whole device in blocks - __u32 startBlock; // Start block we're allowed to use - __u32 endBlock; // End block we're allowed to use - __u16 chunkGroupBits; // 0 for devices <= 32MB. else log2(nchunks) - 16 - __u16 chunkGroupSize; // == 2^^chunkGroupBits - - - void *genericDevice; // Pointer to device context - // On an mtd this holds the mtd pointer. - -#ifdef __KERNEL__ - - struct semaphore sem;// Semaphore for waiting on erasure. - -#endif - - - // NAND access functions (Must be set before calling YAFFS) - - int (*writeChunkToNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare); - int (*readChunkFromNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare); - int (*eraseBlockInNAND)(struct yaffs_DeviceStruct *dev,int blockInNAND); - int (*initialiseNAND)(struct yaffs_DeviceStruct *dev); - -#ifdef __KERNEL__ - void (*putSuperFunc)(struct super_block *sb); -#endif - - // Runtime parameters. - yaffs_BlockInfo *blockInfo; - int nErasedBlocks; - int allocationBlock; - __u32 allocationPage; - - // Runtime state - int nTnodesCreated; - yaffs_Tnode *freeTnodes; - int nFreeTnodes; - yaffs_TnodeList *allocatedTnodeList; - - - int nObjectsCreated; - yaffs_Object *freeObjects; - int nFreeObjects; - - yaffs_ObjectList *allocatedObjectList; - - yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS]; - - int nFreeChunks; - - int currentDirtyChecker; // Used to find current dirtiest block - - int garbageCollectionRequired; - - yaffs_Object *rootDir; - yaffs_Object *lostNFoundDir; - - -}; - - typedef struct yaffs_DeviceStruct yaffs_Device; - - - -//////////// YAFFS Functions ////////////////// - -int yaffs_GutsInitialise(yaffs_Device *dev); -void yaffs_Deinitialise(yaffs_Device *dev); - -int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev); - - -// Rename -int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName); - -// generic Object functions -int yaffs_Unlink(yaffs_Object *dir, const char *name); - -// Object access functions. -int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize); -int yaffs_GetObjectFileLength(yaffs_Object *obj); -int yaffs_GetObjectInode(yaffs_Object *obj); -unsigned yaffs_GetObjectType(yaffs_Object *obj); -int yaffs_GetObjectLinkCount(yaffs_Object *obj); - -// Change inode attributes -int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr); -int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr); - -// File operations -int yaffs_ReadDataFromFile(yaffs_Object *obj, __u8 *buffer, __u32 offset, int nBytes); -int yaffs_WriteDataToFile(yaffs_Object *obj, const __u8 *buffer, __u32 offset, int nBytes); -int yaffs_ResizeFile(yaffs_Object *obj, int newSize); - -yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid); -int yaffs_FlushFile(yaffs_Object *obj); - - -// Directory operations -yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid); -yaffs_Object *yaffs_FindObjectByName(yaffs_Object *theDir,const char *name); -int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *)); - -yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,int number); - -// Link operations -yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject); - -yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj); - -// Symlink operations -yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const char *name, __u32 mode, __u32 uid, __u32 gid, const char *alias); -char *yaffs_GetSymlinkAlias(yaffs_Object *obj); - - -// Special directories -yaffs_Object *yaffs_Root(yaffs_Device *dev); -yaffs_Object *yaffs_LostNFound(yaffs_Device *dev); - - -// Debug dump -int yaffs_DumpObject(yaffs_Object *obj); - - -void yaffs_GutsTest(yaffs_Device *dev); - - -#endif +/* + * YAFFS: Yet another FFS. A NAND-flash specific file system. + * yaffs_guts.h: Configuration etc for yaffs_guts + * + * Copyright (C) 2002 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 General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#ifndef __YAFFS_GUTS_H__ +#define __YAFFS_GUTS_H__ + +#include "devextras.h" + + +#define YAFFS_OK 1 +#define YAFFS_FAIL 0 + +// Y=0x59, A=0x41, S=0x53 +#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 + +#define YAFFS_BYTES_PER_CHUNK 512 +#define YAFFS_CHUNK_SIZE_SHIFT 9 + +#define YAFFS_BYTES_PER_SPARE 16 + +#define YAFFS_CHUNKS_PER_BLOCK 32 +#define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK) + +#define YAFFS_MAX_CHUNK_ID 0x000FFFFF + +#define YAFFS_UNUSED_OBJECT_ID 0x0003FFFF + +#define YAFFS_ALLOCATION_NOBJECTS 100 +#define YAFFS_ALLOCATION_NTNODES 100 +#define YAFFS_ALLOCATION_NLINKS 100 + +#define YAFFS_NOBJECT_BUCKETS 256 + + +#define YAFFS_RESERVED_BLOCKS 5 + +#define YAFFS_OBJECT_SPACE 0x40000 +#define YAFFS_MAX_NAME_LENGTH 255 + +#define YAFFS_MAX_ALIAS_LENGTH 159 + +#define YAFFS_OBJECTID_ROOT 1 +#define YAFFS_OBJECTID_LOSTNFOUND 2 + +// Tags structures in RAM +// NB This uses bitfield. Bitfields should not stradle a u32 boundary otherwise +// the structure size will get blown out. + +typedef struct +{ + unsigned chunkId:20; + unsigned serialNumber:2; + unsigned byteCount:10; + unsigned objectId:18; + unsigned ecc:12; + unsigned unusedStuff:2; +} yaffs_Tags; + +typedef union +{ + yaffs_Tags asTags; + __u8 asBytes[8]; +} yaffs_TagsUnion; + + +// Spare structure +typedef struct +{ + __u8 tagByte0; + __u8 tagByte1; + __u8 tagByte2; + __u8 tagByte3; + __u8 pageStatus; // Currently unused, but sort of set aside to distinguish + // unused - vs- used -vs- deleted chunks. We achieve this by + // using the objectId tags. + __u8 blockStatus; + __u8 tagByte4; + __u8 tagByte5; + __u8 ecc1[3]; + __u8 tagByte6; + __u8 tagByte7; + __u8 ecc2[3]; +} yaffs_Spare; + +// Block data in RAM + +typedef enum { + YAFFS_BLOCK_STATE_UddNKNOWN = 0, + YAFFS_BLOCK_STATE_SCANNING, // Used while the block is being scanned. + // NB Don't erase blocks while they're being scanned + + YAFFS_BLOCK_STATE_EMPTY, // This block is empty + + YAFFS_BLOCK_STATE_ALLOCATING, // This block is partially allocated. + // This is the one currently being used for page + // allocation. Should never be more than one of these + + + YAFFS_BLOCK_STATE_FULL, // All the pages in this block have been allocated. + // At least one page holds valid data. + + YAFFS_BLOCK_STATE_DIRTY, // All pages have been allocated and deleted. + // Erase me, reuse me. + + YAFFS_BLOCK_STATE_DEAD = 0x99 // This block has failed and is not in use + +} yaffs_BlockState; + + + + +typedef struct +{ + __u32 pageBits; // bitmap of pages in use + __u8 blockState; // One of the above block states + __u8 pagesInUse; // number of pages in use +} yaffs_BlockInfo; + + +//////////////////// Object structure /////////////////////////// +// This is the object structure as stored on NAND + +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_ObjectType; + +typedef struct +{ + yaffs_ObjectType type; + + // Apply to everything + int parentObjectId; + __u16 sum; // checksum of name + char name[YAFFS_MAX_NAME_LENGTH + 1]; + + // Thes following apply to directories, files, symlinks - not hard links + __u32 st_mode; // protection + __u32 st_uid; // user ID of owner + __u32 st_gid; // group ID of owner + __u32 st_atime; // time of last access + __u32 st_mtime; // time of last modification + __u32 st_ctime; // time of last change + + // File size applies to files only + int fileSize; + + // Equivalent object id applies to hard links only. + int equivalentObjectId; + + // Alias is for symlinks only. + char alias[YAFFS_MAX_ALIAS_LENGTH + 1]; + + __u32 st_rdev; // device stuff for block and char devices (maj/min) + // Roowm to grow... + __u32 roomToGrow[12]; + +} yaffs_ObjectHeader; + + + +//////////////////// Tnode /////////////////////////// + +union yaffs_Tnode_union +{ + union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL]; + __u16 level0[YAFFS_NTNODES_LEVEL0]; + +}; + +typedef union yaffs_Tnode_union yaffs_Tnode; + +struct yaffs_TnodeList_struct +{ + struct yaffs_TnodeList_struct *next; + yaffs_Tnode *tnodes; +}; + +typedef struct yaffs_TnodeList_struct yaffs_TnodeList; + + + +/////////////////// 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 fileSize; + __u32 scannedFileSize; + __u32 topLevel; + yaffs_Tnode *top; +} yaffs_FileStructure; + +typedef struct +{ + struct list_head children; // list of child links +} yaffs_DirectoryStructure; + +typedef struct +{ + char *alias; +} yaffs_SymLinkStructure; + +typedef struct +{ + struct yaffs_ObjectStruct *equivalentObject; + __u32 equivalentObjectId; +} yaffs_HardLinkStructure; + +typedef union +{ + yaffs_FileStructure fileVariant; + yaffs_DirectoryStructure directoryVariant; + yaffs_SymLinkStructure symLinkVariant; + yaffs_HardLinkStructure hardLinkVariant; +} yaffs_ObjectVariant; + + +struct yaffs_ObjectStruct +{ + __u8 fake:1; // A fake object has no presence on NAND. + __u8 renameAllowed:1; + __u8 unlinkAllowed: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 serial; // serial number of chunk in NAND. Store here so we don't have to + // read back the old one to update. + __u16 sum; // sum of the name to speed searching + + struct yaffs_DeviceStruct *myDev; // The device I'm on + + + struct list_head hashLink; // list of objects in this hash bucket + + + struct list_head hardLinks; // all the equivalent hard linked objects + // live on this list + // directory structure stuff + struct yaffs_ObjectStruct *parent; //my parent directory + struct list_head siblings; // siblings in a directory + // also used for linking up the free list + + // Where's my data in NAND? + int chunkId; // where it lives + + int nDataChunks; // really only for debugging. + + __u32 objectId; // the object id value + + + __u32 st_mode; // protection + __u32 st_uid; // user ID of owner + __u32 st_gid; // group ID of owner + __u32 st_atime; // time of last access + __u32 st_mtime; // time of last modification + __u32 st_ctime; // time of last change + __u32 st_rdev; // device stuff for block and char devices + +#ifdef WIN32 + __u32 inUse; +#endif + + + yaffs_ObjectType variantType; + + yaffs_ObjectVariant variant; + +}; + + + +typedef struct yaffs_ObjectStruct yaffs_Object; + + +struct yaffs_ObjectList_struct +{ + yaffs_Object *objects; + struct yaffs_ObjectList_struct *next; +}; + +typedef struct yaffs_ObjectList_struct yaffs_ObjectList; + +typedef struct +{ + struct list_head list; + __u32 count; +} yaffs_ObjectBucket; + + +//////////////////// Device //////////////////////////////// + +struct yaffs_DeviceStruct +{ + // Entry parameters set up way early. Yaffs sets up the rest. + __u32 nBlocks; // Size of whole device in blocks + __u32 startBlock; // Start block we're allowed to use + __u32 endBlock; // End block we're allowed to use + __u16 chunkGroupBits; // 0 for devices <= 32MB. else log2(nchunks) - 16 + __u16 chunkGroupSize; // == 2^^chunkGroupBits + + + void *genericDevice; // Pointer to device context + // On an mtd this holds the mtd pointer. + +#ifdef __KERNEL__ + + struct semaphore sem;// Semaphore for waiting on erasure. + +#endif + + + // NAND access functions (Must be set before calling YAFFS) + + int (*writeChunkToNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare); + int (*readChunkFromNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare); + int (*eraseBlockInNAND)(struct yaffs_DeviceStruct *dev,int blockInNAND); + int (*initialiseNAND)(struct yaffs_DeviceStruct *dev); + +#ifdef __KERNEL__ + void (*putSuperFunc)(struct super_block *sb); +#endif + + // Runtime parameters. + yaffs_BlockInfo *blockInfo; + int nErasedBlocks; + int allocationBlock; + __u32 allocationPage; + + // Runtime state + int nTnodesCreated; + yaffs_Tnode *freeTnodes; + int nFreeTnodes; + yaffs_TnodeList *allocatedTnodeList; + + + int nObjectsCreated; + yaffs_Object *freeObjects; + int nFreeObjects; + + yaffs_ObjectList *allocatedObjectList; + + yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS]; + + int nFreeChunks; + + int currentDirtyChecker; // Used to find current dirtiest block + + int garbageCollectionRequired; + + // Operations since mount + int nPageWrites; + int nPageReads; + int nBlockErasures; + int nGCCopies; + int nRetriedWrites; + + yaffs_Object *rootDir; + yaffs_Object *lostNFoundDir; + + +}; + + typedef struct yaffs_DeviceStruct yaffs_Device; + + + +//////////// YAFFS Functions ////////////////// + +int yaffs_GutsInitialise(yaffs_Device *dev); +void yaffs_Deinitialise(yaffs_Device *dev); + +int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev); + + +// Rename +int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName); + +// generic Object functions +int yaffs_Unlink(yaffs_Object *dir, const char *name); + +// Object access functions. +int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize); +int yaffs_GetObjectFileLength(yaffs_Object *obj); +int yaffs_GetObjectInode(yaffs_Object *obj); +unsigned yaffs_GetObjectType(yaffs_Object *obj); +int yaffs_GetObjectLinkCount(yaffs_Object *obj); + +// Change inode attributes +int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr); +int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr); + +// File operations +int yaffs_ReadDataFromFile(yaffs_Object *obj, __u8 *buffer, __u32 offset, int nBytes); +int yaffs_WriteDataToFile(yaffs_Object *obj, const __u8 *buffer, __u32 offset, int nBytes); +int yaffs_ResizeFile(yaffs_Object *obj, int newSize); + +yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid); +int yaffs_FlushFile(yaffs_Object *obj); + + +// Directory operations +yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid); +yaffs_Object *yaffs_FindObjectByName(yaffs_Object *theDir,const char *name); +int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *)); + +yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,int number); + +// Link operations +yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject); + +yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj); + +// Symlink operations +yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const char *name, __u32 mode, __u32 uid, __u32 gid, const char *alias); +char *yaffs_GetSymlinkAlias(yaffs_Object *obj); + +// Special inodes (fifos, sockets and devices) +yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,__u32 rdev); + + +// Special directories +yaffs_Object *yaffs_Root(yaffs_Device *dev); +yaffs_Object *yaffs_LostNFound(yaffs_Device *dev); + + +// Debug dump +int yaffs_DumpObject(yaffs_Object *obj); + + +void yaffs_GutsTest(yaffs_Device *dev); + + +#endif diff --git a/yaffsdev b/yaffsdev index 14777893ae8c047ed075a43b3ff7bbfad91a2087..4e083b0f7cfa448d6a10d70841ec5a5db6b81e12 100755 GIT binary patch literal 109461 zcmd?Sdw5hu_AXrAy}M~Jny9F#C_w|Ff(ArIKng+~8C1p#@^f$uhy)Zh-ceDbgW551jG9r#iRQfTs=aGh0?eFqzUTYnd%l9* z`>ooms#dL9wQ5!E>dv+C@#6x4fbv36g%o2=*E!MQxc6SJpAA>pDxwCdL)F2!E5&ES zlc2#>56ml!%fS`G)y@mgc3Ucf`Pv&-A6yK3;))7Vs)u{u2lxGOW#D2xU{}Hc_+;A|_Sd(aJ}D2@ z;{~>ZLFA#KeD<<%CNSkpzV^b^6W1QN*oN+53leUqcA|@MKMdDITz4a$hdcSM!L<_c zfo}X*+}9%hx*Lz-y=5zlku>@P250~~~F z3!dlV&id5Ush7^4J7;QnMe+QKsZ$lyZ93KL1XW%!fBL+IYTo>^ITbV1?9$m1E1f@o z?tEmLzMy#OjIue!v&yb2RkMp{&6+!1%_=V~y-Zy>zpSDZ6eXqeOD`=euPB{Ab;kVS z*`-s<=FFI@=9doWB`B5r zxy;TkE}O$lvr6Zvx%2Qbb?UBaoH4(&RGl{d^!%|?haEHYnBxql2%yWm{ui>+1A?{Q 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- - - - - char *testStr = "this is a test string"; char *testStr2 = "abcdefghijklmnopqrstuvwxyz1234567890"; @@ -123,8 +117,10 @@ void TestTimeasasas(yaffs_Device *dev) yaffs_DumpObject(f); - printf("Resize\n"); - yaffs_ResizeFile(f,2000); + printf("Resize to 3000\n"); + yaffs_ResizeFile(f,3000); + printf("Resize to 2048\n"); + yaffs_ResizeFile(f,2048); yaffs_DumpObject(f); @@ -181,7 +177,7 @@ void TestTime(yaffs_Device *dev) x = yaffs_RenameObject(yaffs_Root(dev),"Name1",NULL,"Rename"); for(i = 0; i < 100000; i+=20) - { + { b++; if(b & 1) @@ -190,15 +186,32 @@ void TestTime(yaffs_Device *dev) written = yaffs_WriteDataToFile(f,testStr2,i,strlen(testStr2)); } + yaffs_ReadDataFromFile(f,data,1000,50); + data[50] = 0; + + printf("Read data is \"%s\"\n",data); + yaffs_ApplyToDirectoryChildren(yaffs_Root(dev),yaffs_DumpObject); + yaffs_ReadDataFromFile(f,data,1000,50); + data[50] = 0; + + printf("Read data is \"%s\"\n",data); printf("Flush\n"); yaffs_FlushFile(f); + yaffs_ReadDataFromFile(f,data,1000,50); + data[50] = 0; + + printf("Read data is \"%s\"\n",data); printf("File length is %d\n",yaffs_GetObjectFileLength(f)); sl = yaffs_MknodSymLink(yaffs_Root(dev),"sym-link",0,0,0,"/tmp/alias"); + yaffs_ReadDataFromFile(f,data,1000,50); + data[50] = 0; + + printf("Read data is \"%s\"\n",data); yaffs_ApplyToDirectoryChildren(yaffs_Root(dev),yaffs_DumpObject); @@ -217,7 +230,18 @@ void TestTime(yaffs_Device *dev) yaffs_DumpObject(f); - printf("Resize\n"); + printf("Resize 3000\n"); + yaffs_ResizeFile(f,3000); + + printf("Resize 2050\n"); + yaffs_ResizeFile(f,2050); + printf("Resize 2049\n"); + yaffs_ResizeFile(f,2049); + printf("Resize 2048\n"); + yaffs_ResizeFile(f,2048); + + + printf("Resize 2000\n"); yaffs_ResizeFile(f,2000); yaffs_DumpObject(f); @@ -299,13 +323,118 @@ void TestTime(yaffs_Device *dev) yaffs_Link(yaffs_Root(dev),"phl4",f); } +void TestTimeDeleteFocussed(yaffs_Device *dev) +{ + yaffs_Object *f; + yaffs_Object *lnf; + + + int x; + int i; + int b; + int written; + + + printf("Exisiting objects\n"); + yaffs_ApplyToDirectoryChildren(yaffs_Root(dev),yaffs_DumpObject); + printf("Exisiting objects in lost+found\n"); + lnf = yaffs_FindObjectByName(yaffs_Root(dev),YAFFS_LOSTNFOUND_NAME); + yaffs_ApplyToDirectoryChildren(lnf,yaffs_DumpObject); + + printf("Start\n"); + + + + + f = yaffs_FindObjectByName(yaffs_Root(dev),"Name1"); + if(f) + { + printf("Found\n"); + } + else + { + f = yaffs_MknodFile(yaffs_Root(dev),"Name1",0,0,0); + printf("Created\n"); + } + + + x = yaffs_RenameObject(yaffs_Root(dev),"Name1",NULL,"Rename"); + + for(i = 0; i < 100000; i+=20) + { + + b++; + if(b & 1) + written = yaffs_WriteDataToFile(f,testStr,i,strlen(testStr)); + else + written = yaffs_WriteDataToFile(f,testStr2,i,strlen(testStr2)); + } + + + + yaffs_FlushFile(f); + + + printf("Unlink file: %d\n",yaffs_Unlink(yaffs_Root(dev),"Rename")); + + yaffs_ApplyToDirectoryChildren(yaffs_Root(dev),yaffs_DumpObject); + +} + +void TestTimeTnodeFocussed(yaffs_Device *dev) +{ + yaffs_Object *f; + yaffs_Object *lnf; + + + int x; + int i; + int b; + int written; + + + printf("Exisiting objects\n"); + yaffs_ApplyToDirectoryChildren(yaffs_Root(dev),yaffs_DumpObject); + printf("Exisiting objects in lost+found\n"); + lnf = yaffs_FindObjectByName(yaffs_Root(dev),YAFFS_LOSTNFOUND_NAME); + yaffs_ApplyToDirectoryChildren(lnf,yaffs_DumpObject); + + printf("Start\n"); + + + + + f = yaffs_FindObjectByName(yaffs_Root(dev),"Name1"); + if(f) + { + printf("Found\n"); + } + else + { + f = yaffs_MknodFile(yaffs_Root(dev),"Name1",0,0,0); + printf("Created\n"); + } + + + x = yaffs_RenameObject(yaffs_Root(dev),"Name1",NULL,"Rename"); + + for(i = 0; i < 10000; i+=20) + { + + b++; + if(b & 1) + written = yaffs_WriteDataToFile(f,testStr,0,strlen(testStr)); + else + written = yaffs_WriteDataToFile(f,testStr2,0,strlen(testStr2)); + } + +} + int main(int argc,char *argv[]) { - device.nBlocks = (2 * 1024 * 1024) / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK); - device.startBlock = 1; // Don't use block 0 - device.endBlock = device.nBlocks - 1; #if YAFFS_FILEEM + device.nBlocks = (64 * 1024 * 1024) / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK); device.writeChunkToNAND = yaffs_FEWriteChunkToNAND; device.readChunkFromNAND = yaffs_FEReadChunkFromNAND; device.eraseBlockInNAND = yaffs_FEEraseBlockInNAND; @@ -313,6 +442,7 @@ int main(int argc,char *argv[]) printf("Testing on file emulation\n"); #else + device.nBlocks = (2 * 1024 * 1024) / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK); device.writeChunkToNAND = nandemul_WriteChunkToNAND; device.readChunkFromNAND = nandemul_ReadChunkFromNAND; device.eraseBlockInNAND = nandemul_EraseBlockInNAND; @@ -321,6 +451,9 @@ int main(int argc,char *argv[]) printf("Testing on RAM emulation\n"); #endif + device.startBlock = 1; // Don't use block 0 + device.endBlock = device.nBlocks - 1; + yaffs_GutsInitialise(&device); // yaffs_GutsTest(); diff --git a/yaffsdev.proj b/yaffsdev.proj index e3e07f414dd3e0e9d25092f5de900db17f85a5be..baf39743ee41e861cc03c6a947a81e1cbc6d12d0 100644 GIT binary patch delta 2314 zcmbVNZA=?w9B22^4QxB=cpIbg3>3;J*Ue+*>*g}^tC<&3xw$wQ*OZVX3$slea&uk| z-g7qArIPbAlM3>39P)5p)Y9rktsNa?ox^KmYe!q7+uNG?*;!wEq{CEa`kTGS{>uKu z-ezyI=UA0h*lG3#^D%RYd7oKfmYJ8B1S2yqFcZumGr&-L3JNH^W}X>&K$&U_&WMvu zaL#`mQ0Z>GHqi4zIJ>ujC$PUFAe>2}QArTHBbq#I7|f}X0tx>(Hqw>S{*WLeDHKv9 z@)JjkCaKbixH2s%2!n=`{AMV9XK3|CV-gxs zG@0mU2^>>0dR9VeT#Q$va9oo`q{>a5F=w#N^#NVKxh9Zy- zdh&L*@p|~8p@eYZT0;fc#%p0=A`ZtYOptz_h17rz%i1B%v#>N^hCjybr6;?3d;R>t zus<-=J3Kbz-Q8mzDAN+e?Qfw(WK;9SI&`R+(GCMuFl zupTYMm_In$*v_m4&r%1}yMt5N9Gd$wUQJg(psOEFlz}D7(oQ;75D<$j#?SY?S$E?CLIf zmxuI(b=cZ$by*dN$d*1^`ZmF%DN z9r{Q5d-^;2EBXq3kzS?Wq2H!orqi@cPt#+xpYEo+XpVN#h(18?qiuAWveDmCQF?_s zLeEp>^aypIYM|Drhr2$2i>Ip@Q3?yNAk^UZb%4nyjuM6zQwzjNUYZNVG*K!T6sDyx zDRL24@0_X#Nmm5Pf-Lg5lUyOAKbj)AK5*kL*el@HOb_;V^w{-tQd?G~1Mg(%&_r<0J8b%&jilMHDq2X@6nIW8 zVYv1VFZ}K+JBrU`Sm&!q=+GiM+|scvxb4oCXPx`HL~&RllX;`}2uLaC^>(;84~J3) qL_lxK<@u7X9U+}OueEppt0623z<6bOj1?A{(jbYIk?4}zZ7}p!)VMRF@`?~)E^j4kRQY)ngB71fTA%#qDF>jG=`XYZa>Bbn%Few-1j-p zeb0NI_dV~OnnqL8=wJ`JpE|v<2^U}B+}s7OjC(QjJTB)-6_G@QWOEy~wNK!-*7Y55 ztf{f4Wjvk^k0`jKy9;-9;*QQX+}Yi&%_%xJc67HlwsmBFY^t;MoX{W9hxJ~)M?a{4 zO20{ehrP-Ez+Pva>;|@(t!7uVW|m=Rb-(DY>#piP*L|i#OBiN9oijUj{fW4d=9Eg5 zFf$$&g7B`_24{C;;CFZFZ8pX)LEqriWGEU9VnLD=5|3lALIeqGLo7RnXnf9J#b0`!Q>5-h_n3~R=OY_Sw!lA@lZ{9+Q!7W6j0rkp?nl5bh z=t7D6kjd5W8ua$L1_r&`ott|#?!(ZzXV#LOTB8Xn@whL6!}3I4Q-4B@w}`lzqy$mL zZMc<+r2UgoS;FJ?obbIl%^RBJh+02^8z@5|s*-n+PsL~gro82vuKIzPpv;Szx2OhX zTb{|;_q;`xf$+L?qlu)?mg~z_BOkbZDrT7YgnYai+)Dm zp>NS;bPkd^)P?NGhE}1K=s?j*^aYZ2)2K(6M&-I) z=pL#^7tvou$Kk~AYM9y8J2^MWWPcXsOXl$V+@{y5RltVPSIj|*9j4gQ9F2}wn3pJa zWD)i?lcLyBigEM2t4x$)$EdB#V{vqik%&)7gj7Zv@sgAng1?9NnIFOunNsl2U2Zy zc78#|Fx;?YX*PoV1)r;{T4d9Matk8_N>~igD;MHI;?6ez=5!wYFIOBHHmOl@a z2I`@5%nYQq624EafS2V8ErQ~0M9sf)ux^cU-f}^y-v+ILVq1WX`G@B`ook6d~Ix{ng T1|!6_Su;0X=TYX~q{;jbz%PwG diff --git a/yportenv.h b/yportenv.h index fc84fc5..94e72fa 100644 --- a/yportenv.h +++ b/yportenv.h @@ -1,56 +1,136 @@ -/* - * YAFFS: Yet another FFS. A NAND-flash specific file system. - * yportenv.h: Portable services used by yaffs. This is done to allow - * simple migration from kernel space into app space for testing. - * - * Copyright (C) 2002 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 General Public License version 2 as - * published by the Free Software Foundation. - * - */ - -#ifndef __PORTENV_H__ -#define __PORTENV_H__ - -#ifndef __KERNEL__ - -#include "stdlib.h" -#include "stdio.h" -#include "string.h" - -#define YPRINTF(x) printf x -#define YMALLOC(x) malloc(x) -#define YFREE(x) free(x) - - -#define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s)) -#define YALERT(s) YINFO(s) - -#else - -#include "linux/kernel.h" -#include "linux/mm.h" -#include "linux/string.h" -#include "linux/slab.h" - -#define YPRINTF(x) printk x -#define YMALLOC(x) kmalloc(x,GFP_KERNEL) -#define YFREE(x) kfree(x) - -#endif - - - -#define YINFO(s) YPRINTF((KERN_DEBUG __FILE__ " %d %s\n",__LINE__,s)) -#define YALERT(s) YINFO(s) - -#endif - - - - +/* + * YAFFS: Yet another FFS. A NAND-flash specific file system. + * yportenv.h: Portable services used by yaffs. This is done to allow + * simple migration from kernel space into app space for testing. + * + * Copyright (C) 2002 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 General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#ifndef __PORTENV_H__ +#define __PORTENV_H__ + + +#if defined WIN32 + +// Win32 +#include "stdlib.h" +#include "stdio.h" +#include "string.h" + +#define YMALLOC(x) malloc(x) +#define YFREE(x) free(x) + + +#define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s)) +#define YALERT(s) YINFO(s) + +#include + +#define YAFFS_LOSTNFOUND_NAME "LOST-N-FOUND" +#define YAFFS_LOSTNFOUND_PREFIX "OBJ" + +#define YPRINTF(x) + +// Always pass the sum compare to overcome the case insensitivity issue +#define yaffs_SumCompare(x,y) 1 +#define yaffs_strcmp(a,b) _stricmp(a,b) + + +#define u_char unsigned char +#define loff_t int +#define S_IFDIR 04000 + +#define S_ISFIFO(x) 0 +#define S_ISCHR(x) 0 +#define S_ISBLK(x) 0 +#define S_ISSOCK(x) 0 + +extern unsigned yfsd_U32FileTimeNow(void); + +#define CURRENT_TIME yfsd_U32FileTimeNow() +#define YAFFS_ROOT_MODE FILE_ATTRIBUTE_ARCHIVE + + +#define TENDSTR "\r\n" +#define TSTR(x) TEXT(x) +#define T(x) RETAILMSG(1, x) + + +#elif defined __KERNEL__ + + + +// Linux kernel +#include "linux/kernel.h" +#include "linux/mm.h" +#include "linux/string.h" +#include "linux/slab.h" +#define YAFFS_LOSTNFOUND_NAME "lost+found" +#define YAFFS_LOSTNFOUND_PREFIX "obj" + +#define YPRINTF(x) printk x +#define YMALLOC(x) kmalloc(x,GFP_KERNEL) +#define YFREE(x) kfree(x) + +#define YAFFS_ROOT_MODE 0666 + + +#define yaffs_SumCompare(x,y) ((x) == (y)) +#define yaffs_strcmp(a,b) strcmp(a,b) + +#define TENDSTR "\n" +#define TSTR(x) KERN_DEBUG x +#define T(x) printk x + + +#else + +// Linux application +#include "stdlib.h" +#include "stdio.h" +#include "string.h" + +#define YMALLOC(x) malloc(x) +#define YFREE(x) free(x) + + +#define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s)) +#define YALERT(s) YINFO(s) + + +#define TENDSTR "\n" +#define TSTR(x) x +#define T(x) printf x + + +#define YAFFS_LOSTNFOUND_NAME "lost+found" +#define YAFFS_LOSTNFOUND_PREFIX "obj" +#define YPRINTF(x) printf x + +#define CURRENT_TIME 0 +#define YAFFS_ROOT_MODE 0666 + +#define yaffs_SumCompare(x,y) ((x) == (y)) +#define yaffs_strcmp(a,b) strcmp(a,b) + +#endif + + + +#undef YINFO + + +#define YINFO(s) YPRINTF((KERN_DEBUG __FILE__ " %d %s\n",__LINE__,s)) +#define YALERT(s) YINFO(s) + + + +#endif -- 2.30.2