2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
15 #include "yaffs_guts.h"
18 #include "yaffs_trace.h"
20 #include <string.h> /* for memset */
22 #define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
25 #define NULL ((void *)0)
29 /* YAFFSFS_RW_SIZE must be a power of 2 */
30 #define YAFFSFS_RW_SHIFT (13)
31 #define YAFFSFS_RW_SIZE (1<<YAFFSFS_RW_SHIFT)
33 /* Some forward references */
34 static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relativeDirectory,
36 int symDepth, int getEquiv,
37 struct yaffs_obj **dirOut,
38 int *notDir, int *loop);
40 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj);
42 unsigned int yaffs_wr_attempts;
46 * There are open inodes in yaffsfs_Inode.
47 * There are open file descriptors in yaffsfs_FileDes.
48 * There are open handles in yaffsfs_FileDes.
50 * Things are structured this way to be like the Linux VFS model
51 * so that interactions with the yaffs guts calls are similar.
52 * That means more common code paths and less special code.
53 * That means better testing etc.
55 * We have 3 layers because:
56 * A handle is different than an fd because you can use dup()
57 * to create a new handle that accesses the *same* fd. The two
58 * handles will use the same offset (part of the fd). We only close
59 * down the fd when there are no more handles accessing it.
61 * More than one fd can currently access one file, but each fd
62 * has its own permsiions and offset.
66 int count; /* Number of handles accessing this inode */
67 struct yaffs_obj *iObj;
76 int inodeId:12; /* Index to corresponding yaffsfs_Inode */
77 int handleCount:10; /* Number of handles for this fd */
78 u32 position; /* current position in file */
86 static yaffsfs_Inode yaffsfs_inode[YAFFSFS_N_HANDLES];
87 static yaffsfs_FileDes yaffsfs_fd[YAFFSFS_N_HANDLES];
88 static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
90 static int yaffsfs_handlesInitialised;
93 unsigned yaffs_set_trace(unsigned tm)
95 yaffs_trace_mask = tm;
96 return yaffs_trace_mask;
99 unsigned yaffs_get_trace(void)
101 return yaffs_trace_mask;
106 * Inilitalise handle management on start-up.
109 static void yaffsfs_InitHandles(void)
112 if(yaffsfs_handlesInitialised)
115 memset(yaffsfs_inode,0,sizeof(yaffsfs_inode));
116 memset(yaffsfs_fd,0,sizeof(yaffsfs_fd));
117 memset(yaffsfs_handle,0,sizeof(yaffsfs_handle));
119 for(i = 0; i < YAFFSFS_N_HANDLES; i++)
120 yaffsfs_fd[i].inodeId = -1;
121 for(i = 0; i < YAFFSFS_N_HANDLES; i++)
122 yaffsfs_handle[i].fdId = -1;
125 static yaffsfs_Handle *yaffsfs_HandleToPointer(int h)
127 if(h >= 0 && h <= YAFFSFS_N_HANDLES)
128 return &yaffsfs_handle[h];
132 static yaffsfs_FileDes *yaffsfs_HandleToFileDes(int handle)
134 yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
136 if(h && h->useCount > 0 && h->fdId >= 0 && h->fdId < YAFFSFS_N_HANDLES)
137 return &yaffsfs_fd[h->fdId];
142 static yaffsfs_Inode *yaffsfs_HandleToInode(int handle)
144 yaffsfs_FileDes *fd = yaffsfs_HandleToFileDes(handle);
146 if(fd && fd->handleCount > 0 &&
147 fd->inodeId >= 0 && fd->inodeId < YAFFSFS_N_HANDLES)
148 return &yaffsfs_inode[fd->inodeId];
153 static struct yaffs_obj *yaffsfs_HandleToObject(int handle)
155 yaffsfs_Inode *in = yaffsfs_HandleToInode(handle);
164 * yaffsfs_FindInodeIdForObject
165 * Find the inode entry for an object, if it exists.
168 static int yaffsfs_FindInodeIdForObject(struct yaffs_obj *obj)
174 obj = yaffs_get_equivalent_obj(obj);
176 /* Look for it in open inode table*/
177 for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
178 if(yaffsfs_inode[i].iObj == obj)
185 * yaffsfs_GetInodeIdForObject
186 * Grab an inode entry when opening a new inode.
188 static int yaffsfs_GetInodeIdForObject(struct yaffs_obj *obj)
192 yaffsfs_Inode *in = NULL;
195 obj = yaffs_get_equivalent_obj(obj);
197 ret = yaffsfs_FindInodeIdForObject(obj);
199 for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
200 if(!yaffsfs_inode[i].iObj)
205 in = &yaffsfs_inode[ret];
217 static int yaffsfs_CountHandles(struct yaffs_obj *obj)
219 int i = yaffsfs_FindInodeIdForObject(obj);
222 return yaffsfs_inode[i].count;
227 static void yaffsfs_ReleaseInode(yaffsfs_Inode *in)
229 struct yaffs_obj *obj;
236 obj->my_inode = NULL;
241 static void yaffsfs_PutInode(int inodeId)
243 if(inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES){
244 yaffsfs_Inode *in = & yaffsfs_inode[inodeId];
247 yaffsfs_ReleaseInode(in);
255 static int yaffsfs_NewHandle(yaffsfs_Handle **hptr)
260 for(i = 0; i < YAFFSFS_N_HANDLES; i++){
261 h = &yaffsfs_handle[i];
263 memset(h,0,sizeof(yaffsfs_Handle));
274 static int yaffsfs_NewHandleAndFileDes(void)
278 yaffsfs_Handle *h = NULL;
279 int handle = yaffsfs_NewHandle(&h);
284 for(i = 0; i < YAFFSFS_N_HANDLES; i++){
286 if(fd->handleCount < 1){
287 memset(fd,0,sizeof(yaffsfs_FileDes));
295 /* Dump the handle because we could not get a fd */
302 * Increase use of handle when reading/writing a file
303 * Also gets the file descriptor.
306 static int yaffsfs_GetHandle(int handle)
308 yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
310 if(h && h->useCount > 0){
319 * Let go of a handle when closing a file or aborting an open or
320 * ending a read or write.
323 static int yaffsfs_PutFileDes(int fdId)
327 if(fdId >= 0 && fdId < YAFFSFS_N_HANDLES){
328 fd = &yaffsfs_fd[fdId];
330 if(fd->handleCount < 1){
331 if(fd->inodeId >= 0){
332 yaffsfs_PutInode(fd->inodeId);
339 static int yaffsfs_PutHandle(int handle)
341 yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
343 if(h && h->useCount > 0){
346 yaffsfs_PutFileDes(h->fdId);
354 static void yaffsfs_BreakDeviceHandles(struct yaffs_dev *dev)
358 struct yaffs_obj *obj;
360 for(i = 0; i < YAFFSFS_N_HANDLES; i++){
361 h = yaffsfs_HandleToPointer(i);
362 fd = yaffsfs_HandleToFileDes(i);
363 obj = yaffsfs_HandleToObject(i);
364 if(h && h->useCount > 0){
368 if(fd && fd->handleCount>0 && obj && obj->my_dev == dev){
371 yaffsfs_PutInode(fd->inodeId);
381 * Stuff to handle names.
385 int yaffsfs_Match(YCHAR a, YCHAR b)
391 int yaffsfs_IsPathDivider(YCHAR ch)
393 const YCHAR *str = YAFFS_PATH_DIVIDERS;
404 int yaffsfs_CheckNameLength(const char *name)
408 int nameLength = strnlen(name,YAFFS_MAX_NAME_LENGTH+1);
411 yaffsfs_SetError(-ENOENT);
413 } else if (nameLength > YAFFS_MAX_NAME_LENGTH){
414 yaffsfs_SetError(-ENAMETOOLONG);
422 static int yaffsfs_alt_dir_path(const YCHAR *path, YCHAR **ret_path)
424 YCHAR *alt_path = NULL;
429 * We don't have a definition for max path length.
430 * We will use 3 * max name length instead.
433 path_length = strnlen(path,(YAFFS_MAX_NAME_LENGTH+1)*3 +1);
435 /* If the last character is a path divider, then we need to
436 * trim it back so that the name look-up works properly.
437 * eg. /foo/new_dir/ -> /foo/newdir
438 * Curveball: Need to handle multiple path dividers:
439 * eg. /foof/sdfse///// -> /foo/sdfse
441 if(path_length > 0 &&
442 yaffsfs_IsPathDivider(path[path_length-1])){
443 alt_path = kmalloc(path_length + 1, 0);
446 strcpy(alt_path, path);
447 for(i = path_length-1;
448 i >= 0 && yaffsfs_IsPathDivider(alt_path[i]);
450 alt_path[i] = (YCHAR) 0;
452 *ret_path = alt_path;
457 LIST_HEAD(yaffsfs_deviceList);
462 * Scan the configuration list to find the device
463 * Curveballs: Should match paths that end in '/' too
464 * Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
466 static struct yaffs_dev *yaffsfs_FindDevice(const YCHAR *path, YCHAR **restOfPath)
468 struct list_head *cfg;
469 const YCHAR *leftOver;
471 struct yaffs_dev *retval = NULL;
472 struct yaffs_dev *dev = NULL;
474 int longestMatch = -1;
478 * Check all configs, choose the one that:
479 * 1) Actually matches a prefix (ie /a amd /abc will not match
480 * 2) Matches the longest.
482 list_for_each(cfg, &yaffsfs_deviceList){
483 dev = list_entry(cfg, struct yaffs_dev, dev_list);
490 while(matching && *p && *leftOver){
491 /* Skip over any /s */
492 while(yaffsfs_IsPathDivider(*p))
495 /* Skip over any /s */
496 while(yaffsfs_IsPathDivider(*leftOver))
499 /* Now match the text part */
501 *p && !yaffsfs_IsPathDivider(*p) &&
502 *leftOver && !yaffsfs_IsPathDivider(*leftOver)){
503 if(yaffsfs_Match(*p,*leftOver)){
513 /* Skip over any /s in leftOver */
514 while(yaffsfs_IsPathDivider(*leftOver))
517 // Skip over any /s in p
518 while(yaffsfs_IsPathDivider(*p))
521 // p should now be at the end of the string (ie. fully matched)
525 if( matching && (thisMatchLength > longestMatch))
528 *restOfPath = (YCHAR *)leftOver;
530 longestMatch = thisMatchLength;
537 static int yaffsfs_CheckPath(const YCHAR *path)
541 while(*path && n < YAFFS_MAX_NAME_LENGTH && divs < 100){
542 if(yaffsfs_IsPathDivider(*path)){
550 return (*path) ? -1 : 0;
553 /* FindMountPoint only returns a dev entry if the path is a mount point */
554 static struct yaffs_dev *yaffsfs_FindMountPoint(const YCHAR *path)
556 struct yaffs_dev *dev;
557 YCHAR *restOfPath=NULL;
558 dev = yaffsfs_FindDevice(path,&restOfPath);
559 if(dev && restOfPath && *restOfPath)
564 static struct yaffs_obj *yaffsfs_FindRoot(const YCHAR *path, YCHAR **restOfPath)
567 struct yaffs_dev *dev;
569 dev= yaffsfs_FindDevice(path,restOfPath);
570 if(dev && dev->is_mounted){
571 return dev->root_dir;
576 static struct yaffs_obj *yaffsfs_FollowLink(struct yaffs_obj *obj,
577 int symDepth, int *loop)
581 obj = yaffs_get_equivalent_obj(obj);
583 while(obj && obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK){
584 YCHAR *alias = obj->variant.symlink_variant.alias;
586 if(yaffsfs_IsPathDivider(*alias))
587 /* Starts with a /, need to scan from root up */
588 obj = yaffsfs_FindObject(NULL,alias,symDepth++,
591 /* Relative to here, so use the parent of the symlink as a start */
592 obj = yaffsfs_FindObject(obj->parent,alias,symDepth++,
600 * yaffsfs_FindDirectory
601 * Parse a path to determine the directory and the name within the directory.
603 * eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
605 static struct yaffs_obj *yaffsfs_DoFindDirectory(struct yaffs_obj *startDir,
606 const YCHAR *path, YCHAR **name, int symDepth,
607 int *notDir,int *loop)
609 struct yaffs_obj *dir;
611 YCHAR str[YAFFS_MAX_NAME_LENGTH+1];
614 if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES){
622 restOfPath = (YCHAR *)path;
625 dir = yaffsfs_FindRoot(path,&restOfPath);
631 * curve ball: also throw away surplus '/'
632 * eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
634 while(yaffsfs_IsPathDivider(*restOfPath))
635 restOfPath++; /* get rid of '/' */
640 while(*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)){
641 if (i < YAFFS_MAX_NAME_LENGTH){
642 str[i] = *restOfPath;
650 /* got to the end of the string */
653 if(strcmp(str,_Y(".")) == 0){
655 } else if(strcmp(str,_Y("..")) == 0) {
658 dir = yaffs_find_by_name(dir,str);
660 dir = yaffsfs_FollowLink(dir,symDepth,loop);
662 if(dir && dir->variant_type !=
663 YAFFS_OBJECT_TYPE_DIRECTORY){
672 /* directory did not exist. */
676 static struct yaffs_obj *yaffsfs_FindDirectory(struct yaffs_obj *relDir,
683 return yaffsfs_DoFindDirectory(relDir,path,name,symDepth,notDir,loop);
687 * yaffsfs_FindObject turns a path for an existing object into the object
689 static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relDir,
690 const YCHAR *path,int symDepth, int getEquiv,
691 struct yaffs_obj **dirOut, int *notDir,int *loop)
693 struct yaffs_obj *dir;
694 struct yaffs_obj *obj;
697 dir = yaffsfs_FindDirectory(relDir,path,&name,symDepth,notDir,loop);
703 obj = yaffs_find_by_name(dir,name);
708 obj = yaffs_get_equivalent_obj(obj);
714 /*************************************************************************
715 * Start of yaffsfs visible functions.
716 *************************************************************************/
718 int yaffs_dup(int handle)
720 int newHandleNumber = -1;
721 yaffsfs_FileDes *existingFD = NULL;
722 yaffsfs_Handle *existingHandle = NULL;
723 yaffsfs_Handle *newHandle = NULL;
726 existingHandle = yaffsfs_HandleToPointer(handle);
727 existingFD = yaffsfs_HandleToFileDes(handle);
729 newHandleNumber = yaffsfs_NewHandle(&newHandle);
731 newHandle->fdId = existingHandle->fdId;
732 existingFD->handleCount++;
738 yaffsfs_SetError(-EBADF);
740 yaffsfs_SetError(-ENOMEM);
742 return newHandleNumber;
748 int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int sharing)
750 struct yaffs_obj *obj = NULL;
751 struct yaffs_obj *dir = NULL;
754 yaffsfs_FileDes *fd = NULL;
757 int errorReported = 0;
758 int rwflags = oflag & ( O_RDWR | O_RDONLY | O_WRONLY);
759 u8 shareRead = (sharing & YAFFS_SHARE_READ) ? 1 : 0;
760 u8 shareWrite = (sharing & YAFFS_SHARE_WRITE) ? 1 : 0;
761 u8 sharedReadAllowed;
762 u8 sharedWriteAllowed;
771 yaffsfs_SetError(-EFAULT);
775 if(yaffsfs_CheckPath(path) < 0){
776 yaffsfs_SetError(-ENAMETOOLONG);
780 /* O_EXCL only has meaning if O_CREAT is specified */
781 if(!(oflag & O_CREAT))
784 /* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
785 if( (oflag & O_CREAT) & (oflag & O_EXCL))
788 /* Todo: Are there any more flag combos to sanitise ? */
790 /* Figure out if reading or writing is requested */
792 readRequested = (rwflags == O_RDWR || rwflags == O_RDONLY) ? 1 : 0;
793 writeRequested = (rwflags == O_RDWR || rwflags == O_WRONLY) ? 1 : 0;
797 handle = yaffsfs_NewHandleAndFileDes();
800 yaffsfs_SetError(-ENFILE);
804 fd = yaffsfs_HandleToFileDes(handle);
806 /* try to find the exisiting object */
807 obj = yaffsfs_FindObject(NULL,path,0,1,NULL,NULL,NULL);
809 obj = yaffsfs_FollowLink(obj,symDepth++,&loop);
812 obj->variant_type != YAFFS_OBJECT_TYPE_FILE &&
813 obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
819 /* The file already exists or it might be a directory */
821 /* If it is a directory then we can't open it as a file */
822 if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
824 yaffsfs_SetError(-EISDIR);
828 /* Open should fail if O_CREAT and O_EXCL are specified since
831 if(!errorReported && (oflag & O_EXCL) && (oflag & O_CREAT)){
833 yaffsfs_SetError(-EEXIST);
837 /* Check file permissions */
838 if( readRequested && !(obj->yst_mode & S_IREAD))
841 if( writeRequested && !(obj->yst_mode & S_IWRITE))
844 if( !errorReported && writeRequested &&
845 obj->my_dev->read_only){
847 yaffsfs_SetError(-EROFS);
851 if(openDenied && !errorReported ) {
852 /* Error if the file exists but permissions are refused. */
853 yaffsfs_SetError(-EACCES);
857 /* Check sharing of an existing object. */
859 yaffsfs_FileDes *fdx;
862 sharedReadAllowed = 1;
863 sharedWriteAllowed = 1;
866 for( i = 0; i < YAFFSFS_N_HANDLES; i++){
867 fdx = &yaffsfs_fd[i];
868 if(fdx->handleCount > 0 &&
870 yaffsfs_inode[fdx->inodeId].iObj == obj){
872 sharedReadAllowed = 0;
874 sharedWriteAllowed = 0;
884 if((!sharedReadAllowed && readRequested)||
885 (!shareRead && alreadyReading) ||
886 (!sharedWriteAllowed && writeRequested) ||
887 (!shareWrite && alreadyWriting)){
889 yaffsfs_SetError(-EBUSY);
896 /* If we could not open an existing object, then let's see if
897 * the directory exists. If not, error.
899 if(!obj && !errorReported){
900 dir = yaffsfs_FindDirectory(NULL,path,&name,0,¬Dir,&loop);
902 yaffsfs_SetError(-ENOTDIR);
905 yaffsfs_SetError(-ELOOP);
908 yaffsfs_SetError(-ENOENT);
913 if(!obj && dir && !errorReported && (oflag & O_CREAT)) {
914 /* Let's see if we can create this file if it does not exist. */
915 if(dir->my_dev->read_only){
916 yaffsfs_SetError(-EROFS);
919 obj = yaffs_create_file(dir,name,mode,0,0);
921 if(!obj && !errorReported){
922 yaffsfs_SetError(-ENOSPC);
927 if(!obj && dir && !errorReported && !(oflag & O_CREAT)) {
928 /* Error if the file does not exist and CREAT is not set. */
929 yaffsfs_SetError(-ENOENT);
933 if(obj && !openDenied) {
934 int inodeId = yaffsfs_GetInodeIdForObject(obj);
938 * Todo: Fix any problem if inodes run out, though that
939 * can't happen if the number of inode items >= number of handles.
943 fd->inodeId = inodeId;
944 fd->reading = readRequested;
945 fd->writing = writeRequested;
946 fd->append = (oflag & O_APPEND) ? 1 : 0;
948 fd->shareRead = shareRead;
949 fd->shareWrite = shareWrite;
951 /* Hook inode to object */
952 obj->my_inode = (void*) &yaffsfs_inode[inodeId];
954 if((oflag & O_TRUNC) && fd->writing)
955 yaffs_resize_file(obj,0);
957 yaffsfs_PutHandle(handle);
959 yaffsfs_SetError(0); /* Problem */
969 int yaffs_open(const YCHAR *path, int oflag, int mode)
971 return yaffs_open_sharing(path, oflag, mode,
972 YAFFS_SHARE_READ | YAFFS_SHARE_WRITE);
975 int yaffs_Dofsync(int handle,int datasync)
978 struct yaffs_obj *obj;
982 obj = yaffsfs_HandleToObject(handle);
985 yaffsfs_SetError(-EBADF);
986 else if(obj->my_dev->read_only)
987 yaffsfs_SetError(-EROFS);
989 yaffs_flush_file(obj,1,datasync);
998 int yaffs_fsync(int handle)
1000 return yaffs_Dofsync(handle,0);
1003 int yaffs_flush(int handle)
1005 return yaffs_fsync(handle);
1008 int yaffs_fdatasync(int handle)
1010 return yaffs_Dofsync(handle,1);
1013 int yaffs_close(int handle)
1015 yaffsfs_Handle *h = NULL;
1016 struct yaffs_obj *obj = NULL;
1021 h = yaffsfs_HandleToPointer(handle);
1022 obj = yaffsfs_HandleToObject(handle);
1025 yaffsfs_SetError(-EBADF);
1028 yaffs_flush_file(obj,1,0);
1029 yaffsfs_PutHandle(handle);
1040 int yaffsfs_do_read(int handle, void *vbuf, unsigned int nbyte, int isPread, int offset)
1042 yaffsfs_FileDes *fd = NULL;
1043 struct yaffs_obj *obj = NULL;
1050 unsigned int maxRead;
1051 u8 *buf = (u8 *)vbuf;
1054 yaffsfs_SetError(-EFAULT);
1059 fd = yaffsfs_HandleToFileDes(handle);
1060 obj = yaffsfs_HandleToObject(handle);
1064 yaffsfs_SetError(-EBADF);
1066 } else if(!fd->reading){
1067 /* Not a reading handle */
1068 yaffsfs_SetError(-EINVAL);
1070 } else if(nbyte > YAFFS_MAX_FILE_SIZE){
1071 yaffsfs_SetError(-EINVAL);
1077 startPos = fd->position;
1081 if(yaffs_get_obj_length(obj) > pos)
1082 maxRead = yaffs_get_obj_length(obj) - pos;
1090 yaffsfs_GetHandle(handle);
1092 endPos = pos + nbyte;
1094 if(pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
1095 nbyte > YAFFS_MAX_FILE_SIZE ||
1096 endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE){
1102 nToRead = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
1107 * Need to reverify object in case the device was
1108 * unmounted in another thread.
1110 obj = yaffsfs_HandleToObject(handle);
1114 nRead = yaffs_file_rd(obj,buf,pos,nToRead);
1122 if(nRead == nToRead)
1125 nbyte = 0; /* no more to read */
1135 yaffsfs_PutHandle(handle);
1139 fd->position = startPos + totalRead;
1141 yaffsfs_SetError(-EINVAL);
1148 return (totalRead >= 0) ? totalRead : -1;
1152 int yaffs_read(int handle, void *buf, unsigned int nbyte)
1154 return yaffsfs_do_read(handle, buf, nbyte, 0, 0);
1157 int yaffs_pread(int handle, void *buf, unsigned int nbyte, unsigned int offset)
1159 return yaffsfs_do_read(handle, buf, nbyte, 1, offset);
1162 int yaffsfs_do_write(int handle, const void *vbuf, unsigned int nbyte, int isPwrite, int offset)
1164 yaffsfs_FileDes *fd = NULL;
1165 struct yaffs_obj *obj = NULL;
1170 int totalWritten = 0;
1171 int write_trhrough = 0;
1173 const u8 *buf = (const u8 *)vbuf;
1176 yaffsfs_SetError(-EFAULT);
1181 fd = yaffsfs_HandleToFileDes(handle);
1182 obj = yaffsfs_HandleToObject(handle);
1186 yaffsfs_SetError(-EBADF);
1188 } else if(!fd->writing){
1189 yaffsfs_SetError(-EINVAL);
1191 } else if(obj->my_dev->read_only){
1192 yaffsfs_SetError(-EROFS);
1196 startPos = yaffs_get_obj_length(obj);
1200 startPos = fd->position;
1202 yaffsfs_GetHandle(handle);
1204 endPos = pos + nbyte;
1206 if(pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
1207 nbyte > YAFFS_MAX_FILE_SIZE ||
1208 endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE){
1215 nToWrite = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
1216 if(nToWrite > nbyte)
1220 * Need to reverify object in case the device was
1221 * remounted or unmounted in another thread.
1223 obj = yaffsfs_HandleToObject(handle);
1224 if(!obj || obj->my_dev->read_only)
1227 nWritten = yaffs_wr_file(obj,buf,pos,nToWrite,
1230 totalWritten += nWritten;
1235 if(nWritten == nToWrite)
1240 if(nWritten < 1 && totalWritten < 1){
1241 yaffsfs_SetError(-ENOSPC);
1251 yaffsfs_PutHandle(handle);
1254 if(totalWritten > 0)
1255 fd->position = startPos + totalWritten;
1257 yaffsfs_SetError(-EINVAL);
1263 return (totalWritten >= 0) ? totalWritten : -1;
1266 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
1268 return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
1271 int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, unsigned int offset)
1273 return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
1277 int yaffs_truncate(const YCHAR *path,off_t new_size)
1279 struct yaffs_obj *obj = NULL;
1280 struct yaffs_obj *dir = NULL;
1281 int result = YAFFS_FAIL;
1286 yaffsfs_SetError(-EFAULT);
1290 if(yaffsfs_CheckPath(path) < 0){
1291 yaffsfs_SetError(-ENAMETOOLONG);
1297 obj = yaffsfs_FindObject(NULL,path,0,1,&dir,¬Dir,&loop);
1298 obj = yaffsfs_FollowLink(obj,0,&loop);
1301 yaffsfs_SetError(-ENOTDIR);
1303 yaffsfs_SetError(-ELOOP);
1304 else if(!dir || !obj)
1305 yaffsfs_SetError(-ENOENT);
1306 else if(obj->my_dev->read_only)
1307 yaffsfs_SetError(-EROFS);
1308 else if(obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
1309 yaffsfs_SetError(-EISDIR);
1310 else if(obj->my_dev->read_only)
1311 yaffsfs_SetError(-EROFS);
1312 else if(new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
1313 yaffsfs_SetError(-EINVAL);
1315 result = yaffs_resize_file(obj,new_size);
1319 return (result) ? 0 : -1;
1322 int yaffs_ftruncate(int handle, off_t new_size)
1324 yaffsfs_FileDes *fd = NULL;
1325 struct yaffs_obj *obj = NULL;
1329 fd = yaffsfs_HandleToFileDes(handle);
1330 obj = yaffsfs_HandleToObject(handle);
1334 yaffsfs_SetError(-EBADF);
1335 else if(!fd->writing)
1336 yaffsfs_SetError(-EINVAL);
1337 else if(obj->my_dev->read_only)
1338 yaffsfs_SetError(-EROFS);
1339 else if( new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
1340 yaffsfs_SetError(-EINVAL);
1342 /* resize the file */
1343 result = yaffs_resize_file(obj,new_size);
1346 return (result) ? 0 : -1;
1350 off_t yaffs_lseek(int handle, off_t offset, int whence)
1352 yaffsfs_FileDes *fd = NULL;
1353 struct yaffs_obj *obj = NULL;
1358 fd = yaffsfs_HandleToFileDes(handle);
1359 obj = yaffsfs_HandleToObject(handle);
1362 yaffsfs_SetError(-EBADF);
1363 else if(offset > YAFFS_MAX_FILE_SIZE)
1364 yaffsfs_SetError(-EINVAL);
1366 if(whence == SEEK_SET){
1369 } else if(whence == SEEK_CUR) {
1370 if( (fd->position + offset) >= 0)
1371 pos = (fd->position + offset);
1372 } else if(whence == SEEK_END) {
1373 fSize = yaffs_get_obj_length(obj);
1374 if(fSize >= 0 && (fSize + offset) >= 0)
1375 pos = fSize + offset;
1378 if(pos >= 0 && pos <= YAFFS_MAX_FILE_SIZE)
1381 yaffsfs_SetError(-EINVAL);
1392 int yaffsfs_DoUnlink(const YCHAR *path,int isDirectory)
1394 struct yaffs_obj *dir = NULL;
1395 struct yaffs_obj *obj = NULL;
1397 int result = YAFFS_FAIL;
1402 yaffsfs_SetError(-EFAULT);
1406 if(yaffsfs_CheckPath(path) < 0){
1407 yaffsfs_SetError(-ENAMETOOLONG);
1413 obj = yaffsfs_FindObject(NULL,path,0,0,NULL,NULL,NULL);
1414 dir = yaffsfs_FindDirectory(NULL,path,&name,0,¬Dir,&loop);
1417 yaffsfs_SetError(-ENOTDIR);
1419 yaffsfs_SetError(-ELOOP);
1421 yaffsfs_SetError(-ENOENT);
1422 else if(strncmp(name,_Y("."),2) == 0)
1423 yaffsfs_SetError(-EINVAL);
1425 yaffsfs_SetError(-ENOENT);
1426 else if(obj->my_dev->read_only)
1427 yaffsfs_SetError(-EROFS);
1428 else if(!isDirectory && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
1429 yaffsfs_SetError(-EISDIR);
1430 else if(isDirectory && obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1431 yaffsfs_SetError(-ENOTDIR);
1432 else if(isDirectory && obj == obj->my_dev->root_dir)
1433 yaffsfs_SetError(-EBUSY); /* Can't rmdir a root */
1435 result = yaffs_unlinker(dir,name);
1437 if(result == YAFFS_FAIL && isDirectory)
1438 yaffsfs_SetError(-ENOTEMPTY);
1443 return (result == YAFFS_FAIL) ? -1 : 0;
1447 int yaffs_unlink(const YCHAR *path)
1449 return yaffsfs_DoUnlink(path,0);
1452 int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
1454 struct yaffs_obj *olddir = NULL;
1455 struct yaffs_obj *newdir = NULL;
1456 struct yaffs_obj *obj = NULL;
1457 struct yaffs_obj *newobj = NULL;
1460 int result= YAFFS_FAIL;
1461 int rename_allowed = 1;
1467 YCHAR *alt_newpath=NULL;
1469 if(!oldPath || !newPath){
1470 yaffsfs_SetError(-EFAULT);
1474 if(yaffsfs_CheckPath(oldPath) < 0 ||
1475 yaffsfs_CheckPath(newPath) < 0){
1476 yaffsfs_SetError(-ENAMETOOLONG);
1480 if(yaffsfs_alt_dir_path(newPath, &alt_newpath) < 0){
1481 yaffsfs_SetError(-ENOMEM);
1485 newPath = alt_newpath;
1490 olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0,¬OldDir,&oldLoop);
1491 newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0,¬NewDir,&newLoop);
1492 obj = yaffsfs_FindObject(NULL,oldPath,0,0,NULL,NULL,NULL);
1493 newobj = yaffsfs_FindObject(NULL,newPath,0,0,NULL,NULL,NULL);
1495 /* If the object being renamed is a directory and the
1496 * path ended with a "/" then the olddir == obj.
1497 * We pass through NULL for the old name to tell the lower layers
1498 * to use olddir as the object.
1504 if((!olddir && notOldDir) || (!newdir && notNewDir)) {
1505 yaffsfs_SetError(-ENOTDIR);
1507 } else if(oldLoop || newLoop) {
1508 yaffsfs_SetError(-ELOOP);
1510 } else if (olddir && oldname && strncmp(oldname, _Y("."),2) == 0){
1511 yaffsfs_SetError(-EINVAL);
1513 }else if(!olddir || !newdir || !obj) {
1514 yaffsfs_SetError(-ENOENT);
1516 } else if(obj->my_dev->read_only){
1517 yaffsfs_SetError(-EROFS);
1519 } else if(yaffs_is_non_empty_dir(newobj)){
1520 yaffsfs_SetError(-ENOTEMPTY);
1522 } else if(olddir->my_dev != newdir->my_dev) {
1523 /* Rename must be on same device */
1524 yaffsfs_SetError(-EXDEV);
1526 } else if(obj && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
1528 * It is a directory, check that it is not being renamed to
1529 * being its own decendent.
1530 * Do this by tracing from the new directory back to the root,
1534 struct yaffs_obj *xx = newdir;
1536 while( rename_allowed && xx){
1542 yaffsfs_SetError(-EINVAL);
1546 result = yaffs_rename_obj(olddir,oldname,newdir,newname);
1553 return (result == YAFFS_FAIL) ? -1 : 0;
1557 static int yaffsfs_DoStat(struct yaffs_obj *obj,struct yaffs_stat *buf)
1561 obj = yaffs_get_equivalent_obj(obj);
1564 buf->st_dev = (int)obj->my_dev->os_context;
1565 buf->st_ino = obj->obj_id;
1566 buf->st_mode = obj->yst_mode & ~S_IFMT; /* clear out file type bits */
1568 if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
1569 buf->st_mode |= S_IFDIR;
1570 else if(obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
1571 buf->st_mode |= S_IFLNK;
1572 else if(obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
1573 buf->st_mode |= S_IFREG;
1575 buf->st_nlink = yaffs_get_obj_link_count(obj);
1578 buf->st_rdev = obj->yst_rdev;
1579 buf->st_size = yaffs_get_obj_length(obj);
1580 buf->st_blksize = obj->my_dev->data_bytes_per_chunk;
1581 buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
1582 #if CONFIG_YAFFS_WINCE
1583 buf->yst_wince_atime[0] = obj->win_atime[0];
1584 buf->yst_wince_atime[1] = obj->win_atime[1];
1585 buf->yst_wince_ctime[0] = obj->win_ctime[0];
1586 buf->yst_wince_ctime[1] = obj->win_ctime[1];
1587 buf->yst_wince_mtime[0] = obj->win_mtime[0];
1588 buf->yst_wince_mtime[1] = obj->win_mtime[1];
1590 buf->yst_atime = obj->yst_atime;
1591 buf->yst_ctime = obj->yst_ctime;
1592 buf->yst_mtime = obj->yst_mtime;
1599 static int yaffsfs_DoStatOrLStat(const YCHAR *path, struct yaffs_stat *buf,int doLStat)
1601 struct yaffs_obj *obj=NULL;
1602 struct yaffs_obj *dir=NULL;
1608 yaffsfs_SetError(-EFAULT);
1612 if(yaffsfs_CheckPath(path) < 0){
1613 yaffsfs_SetError(-ENAMETOOLONG);
1619 obj = yaffsfs_FindObject(NULL,path,0,1,&dir,¬Dir,&loop);
1622 obj = yaffsfs_FollowLink(obj,0,&loop);
1625 yaffsfs_SetError(-ENOTDIR);
1627 yaffsfs_SetError(-ELOOP);
1628 else if(!dir || !obj)
1629 yaffsfs_SetError(-ENOENT);
1631 retVal = yaffsfs_DoStat(obj,buf);
1639 int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
1641 return yaffsfs_DoStatOrLStat(path,buf,0);
1644 int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
1646 return yaffsfs_DoStatOrLStat(path,buf,1);
1649 int yaffs_fstat(int fd, struct yaffs_stat *buf)
1651 struct yaffs_obj *obj;
1656 yaffsfs_SetError(-EFAULT);
1661 obj = yaffsfs_HandleToObject(fd);
1664 retVal = yaffsfs_DoStat(obj,buf);
1667 yaffsfs_SetError(-EBADF);
1674 #ifndef CONFIG_YAFFS_WINCE
1675 /* xattrib functions */
1678 static int yaffs_do_setxattr(const YCHAR *path, const char *name,
1679 const void *data, int size, int flags, int follow)
1681 struct yaffs_obj *obj;
1682 struct yaffs_obj *dir;
1688 if(!path || !name || !data){
1689 yaffsfs_SetError(-EFAULT);
1693 if(yaffsfs_CheckPath(path) < 0){
1694 yaffsfs_SetError(-ENAMETOOLONG);
1700 obj = yaffsfs_FindObject(NULL,path,0,1,&dir,¬Dir,&loop);
1703 obj = yaffsfs_FollowLink(obj,0,&loop);
1706 yaffsfs_SetError(-ENOTDIR);
1708 yaffsfs_SetError(-ELOOP);
1709 else if(!dir || !obj)
1710 yaffsfs_SetError(-ENOENT);
1712 retVal = yaffs_set_xattrib(obj,name,data,size,flags);
1714 yaffsfs_SetError(retVal);
1725 int yaffs_setxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1727 return yaffs_do_setxattr(path, name, data, size, flags, 1);
1730 int yaffs_lsetxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1732 return yaffs_do_setxattr(path, name, data, size, flags, 0);
1737 int yaffs_fsetxattr(int fd, const char *name, const void *data, int size, int flags)
1739 struct yaffs_obj *obj;
1744 yaffsfs_SetError(-EFAULT);
1749 obj = yaffsfs_HandleToObject(fd);
1752 yaffsfs_SetError(-EBADF);
1754 retVal = yaffs_set_xattrib(obj,name,data,size,flags);
1756 yaffsfs_SetError(retVal);
1766 static int yaffs_do_getxattr(const YCHAR *path, const char *name, void *data, int size, int follow)
1768 struct yaffs_obj *obj;
1769 struct yaffs_obj *dir;
1774 if(!path || !name || !data ){
1775 yaffsfs_SetError(-EFAULT);
1779 if(yaffsfs_CheckPath(path) < 0){
1780 yaffsfs_SetError(-ENAMETOOLONG);
1786 obj = yaffsfs_FindObject(NULL,path,0,1,&dir,¬Dir,&loop);
1789 obj = yaffsfs_FollowLink(obj,0,&loop);
1792 yaffsfs_SetError(-ENOTDIR);
1794 yaffsfs_SetError(-ELOOP);
1795 else if(!dir || !obj)
1796 yaffsfs_SetError(-ENOENT);
1798 retVal = yaffs_get_xattrib(obj,name,data,size);
1800 yaffsfs_SetError(retVal);
1810 int yaffs_getxattr(const YCHAR *path, const char *name, void *data, int size)
1812 return yaffs_do_getxattr( path, name, data, size, 1);
1814 int yaffs_lgetxattr(const YCHAR *path, const char *name, void *data, int size)
1816 return yaffs_do_getxattr( path, name, data, size, 0);
1821 int yaffs_fgetxattr(int fd, const char *name, void *data, int size)
1823 struct yaffs_obj *obj;
1827 if(!name || !data ){
1828 yaffsfs_SetError(-EFAULT);
1833 obj = yaffsfs_HandleToObject(fd);
1836 retVal = yaffs_get_xattrib(obj,name,data,size);
1838 yaffsfs_SetError(retVal);
1843 yaffsfs_SetError(-EBADF);
1850 static int yaffs_do_listxattr(const YCHAR *path, char *data, int size, int follow)
1852 struct yaffs_obj *obj=NULL;
1853 struct yaffs_obj *dir=NULL;
1858 if(!path || !data ){
1859 yaffsfs_SetError(-EFAULT);
1863 if(yaffsfs_CheckPath(path) < 0){
1864 yaffsfs_SetError(-ENAMETOOLONG);
1870 obj = yaffsfs_FindObject(NULL,path,0,1,&dir,¬Dir,&loop);
1873 obj = yaffsfs_FollowLink(obj,0,&loop);
1876 yaffsfs_SetError(-ENOTDIR);
1878 yaffsfs_SetError(-ELOOP);
1879 else if(!dir || !obj)
1880 yaffsfs_SetError(-ENOENT);
1882 retVal = yaffs_list_xattrib(obj, data,size);
1884 yaffsfs_SetError(retVal);
1895 int yaffs_listxattr(const YCHAR *path, char *data, int size)
1897 return yaffs_do_listxattr(path, data, size, 1);
1900 int yaffs_llistxattr(const YCHAR *path, char *data, int size)
1902 return yaffs_do_listxattr(path, data, size, 0);
1905 int yaffs_flistxattr(int fd, char *data, int size)
1907 struct yaffs_obj *obj;
1912 yaffsfs_SetError(-EFAULT);
1917 obj = yaffsfs_HandleToObject(fd);
1920 retVal = yaffs_list_xattrib(obj,data,size);
1922 yaffsfs_SetError(retVal);
1927 yaffsfs_SetError(-EBADF);
1934 static int yaffs_do_removexattr(const YCHAR *path, const char *name, int follow)
1936 struct yaffs_obj *obj=NULL;
1937 struct yaffs_obj *dir=NULL;
1943 yaffsfs_SetError(-EFAULT);
1947 if(yaffsfs_CheckPath(path) < 0){
1948 yaffsfs_SetError(-ENAMETOOLONG);
1954 obj = yaffsfs_FindObject(NULL,path,0,1, &dir,¬Dir,&loop);
1957 obj = yaffsfs_FollowLink(obj,0,&loop);
1960 yaffsfs_SetError(-ENOTDIR);
1962 yaffsfs_SetError(-ELOOP);
1963 else if(!dir || !obj)
1964 yaffsfs_SetError(-ENOENT);
1966 retVal = yaffs_remove_xattrib(obj,name);
1968 yaffsfs_SetError(retVal);
1979 int yaffs_removexattr(const YCHAR *path, const char *name)
1981 return yaffs_do_removexattr(path, name, 1);
1984 int yaffs_lremovexattr(const YCHAR *path, const char *name)
1986 return yaffs_do_removexattr(path, name, 0);
1989 int yaffs_fremovexattr(int fd, const char *name)
1991 struct yaffs_obj *obj;
1996 yaffsfs_SetError(-EFAULT);
2001 obj = yaffsfs_HandleToObject(fd);
2004 retVal = yaffs_remove_xattrib(obj,name);
2006 yaffsfs_SetError(retVal);
2011 yaffsfs_SetError(-EBADF);
2019 #ifdef CONFIG_YAFFS_WINCE
2020 int yaffs_get_wince_times(int fd, unsigned *wctime, unsigned *watime, unsigned *wmtime)
2022 struct yaffs_obj *obj;
2027 obj = yaffsfs_HandleToObject(fd);
2032 wctime[0] = obj->win_ctime[0];
2033 wctime[1] = obj->win_ctime[1];
2036 watime[0] = obj->win_atime[0];
2037 watime[1] = obj->win_atime[1];
2040 wmtime[0] = obj->win_mtime[0];
2041 wmtime[1] = obj->win_mtime[1];
2048 yaffsfs_SetError(-EBADF);
2056 int yaffs_set_wince_times(int fd,
2057 const unsigned *wctime,
2058 const unsigned *watime,
2059 const unsigned *wmtime)
2061 struct yaffs_obj *obj;
2066 obj = yaffsfs_HandleToObject(fd);
2071 obj->win_ctime[0] = wctime[0];
2072 obj->win_ctime[1] = wctime[1];
2075 obj->win_atime[0] = watime[0];
2076 obj->win_atime[1] = watime[1];
2079 obj->win_mtime[0] = wmtime[0];
2080 obj->win_mtime[1] = wmtime[1];
2084 result = yaffs_flush_file(obj,0,0);
2088 yaffsfs_SetError(-EBADF);
2098 static int yaffsfs_DoChMod(struct yaffs_obj *obj,mode_t mode)
2103 obj = yaffs_get_equivalent_obj(obj);
2106 obj->yst_mode = mode;
2108 result = yaffs_flush_file(obj,0,0);
2111 return result == YAFFS_OK ? 0 : -1;
2115 int yaffs_access(const YCHAR *path, int amode)
2117 struct yaffs_obj *obj=NULL;
2118 struct yaffs_obj *dir=NULL;
2124 yaffsfs_SetError(-EFAULT);
2128 if(yaffsfs_CheckPath(path) < 0){
2129 yaffsfs_SetError(-ENAMETOOLONG);
2133 if(amode & ~(R_OK | W_OK | X_OK)){
2134 yaffsfs_SetError(-EINVAL);
2140 obj = yaffsfs_FindObject(NULL,path,0,1, &dir,¬Dir,&loop);
2141 obj = yaffsfs_FollowLink(obj,0,&loop);
2144 yaffsfs_SetError(-ENOTDIR);
2146 yaffsfs_SetError(-ELOOP);
2147 else if(!dir || !obj)
2148 yaffsfs_SetError(-ENOENT);
2149 else if((amode & W_OK) && obj->my_dev->read_only)
2150 yaffsfs_SetError(-EROFS);
2154 if((amode & R_OK) && !(obj->yst_mode & S_IREAD))
2156 if((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
2158 if((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
2162 yaffsfs_SetError(-EACCES);
2174 int yaffs_chmod(const YCHAR *path, mode_t mode)
2176 struct yaffs_obj *obj=NULL;
2177 struct yaffs_obj *dir=NULL;
2183 yaffsfs_SetError(-EFAULT);
2187 if(yaffsfs_CheckPath(path) < 0){
2188 yaffsfs_SetError(-ENAMETOOLONG);
2193 yaffsfs_SetError(-EINVAL);
2199 obj = yaffsfs_FindObject(NULL,path,0,1, &dir, ¬Dir,&loop);
2200 obj = yaffsfs_FollowLink(obj,0,&loop);
2203 yaffsfs_SetError(-ENOTDIR);
2205 yaffsfs_SetError(-ELOOP);
2206 else if(!dir || !obj)
2207 yaffsfs_SetError(-ENOENT);
2208 else if(obj->my_dev->read_only)
2209 yaffsfs_SetError(-EROFS);
2211 retVal = yaffsfs_DoChMod(obj,mode);
2220 int yaffs_fchmod(int fd, mode_t mode)
2222 struct yaffs_obj *obj;
2226 yaffsfs_SetError(-EINVAL);
2231 obj = yaffsfs_HandleToObject(fd);
2234 yaffsfs_SetError(-EBADF);
2235 else if(obj->my_dev->read_only)
2236 yaffsfs_SetError(-EROFS);
2238 retVal = yaffsfs_DoChMod(obj,mode);
2245 int yaffs_mkdir(const YCHAR *path, mode_t mode)
2247 struct yaffs_obj *parent = NULL;
2248 struct yaffs_obj *dir = NULL;
2250 YCHAR *alt_path = NULL;
2256 yaffsfs_SetError(-EFAULT);
2260 if(yaffsfs_CheckPath(path) < 0){
2261 yaffsfs_SetError(-ENAMETOOLONG);
2265 if(yaffsfs_alt_dir_path(path, &alt_path) < 0){
2266 yaffsfs_SetError(-ENOMEM);
2273 parent = yaffsfs_FindDirectory(NULL,path,&name,0,¬Dir,&loop);
2274 if(!parent && notDir)
2275 yaffsfs_SetError(-ENOTDIR);
2277 yaffsfs_SetError(-ELOOP);
2279 yaffsfs_SetError(-ENOENT);
2280 else if(strnlen(name,5) == 0){
2281 /* Trying to make the root itself */
2282 yaffsfs_SetError(-EEXIST);
2283 } else if(parent->my_dev->read_only)
2284 yaffsfs_SetError(-EROFS);
2286 dir = yaffs_create_dir(parent,name,mode,0,0);
2289 else if (yaffs_find_by_name(parent,name))
2290 yaffsfs_SetError(-EEXIST); /* the name already exists */
2292 yaffsfs_SetError(-ENOSPC); /* just assume no space */
2303 int yaffs_rmdir(const YCHAR *path)
2309 yaffsfs_SetError(-EFAULT);
2313 if(yaffsfs_CheckPath(path) < 0){
2314 yaffsfs_SetError(-ENAMETOOLONG);
2318 if(yaffsfs_alt_dir_path(path, &alt_path) < 0){
2319 yaffsfs_SetError(-ENOMEM);
2324 result = yaffsfs_DoUnlink(path,1);
2331 void * yaffs_getdev(const YCHAR *path)
2333 struct yaffs_dev *dev=NULL;
2335 dev = yaffsfs_FindDevice(path,&dummy);
2339 int yaffs_mount2(const YCHAR *path,int read_only)
2342 int result=YAFFS_FAIL;
2343 struct yaffs_dev *dev=NULL;
2346 yaffsfs_SetError(-EFAULT);
2350 yaffs_trace(YAFFS_TRACE_MOUNT,"yaffs: Mounting %s",path);
2352 if(yaffsfs_CheckPath(path) < 0){
2353 yaffsfs_SetError(-ENAMETOOLONG);
2359 yaffsfs_InitHandles();
2361 dev = yaffsfs_FindMountPoint(path);
2363 if(!dev->is_mounted){
2364 dev->read_only = read_only ? 1 : 0;
2365 result = yaffs_guts_initialise(dev);
2366 if(result == YAFFS_FAIL)
2367 yaffsfs_SetError(-ENOMEM);
2368 retVal = result ? 0 : -1;
2372 yaffsfs_SetError(-EBUSY);
2374 yaffsfs_SetError(-ENODEV);
2381 int yaffs_mount(const YCHAR *path)
2383 return yaffs_mount2(path,0);
2386 int yaffs_sync(const YCHAR *path)
2389 struct yaffs_dev *dev=NULL;
2393 yaffsfs_SetError(-EFAULT);
2397 if(yaffsfs_CheckPath(path) < 0){
2398 yaffsfs_SetError(-ENAMETOOLONG);
2403 dev = yaffsfs_FindDevice(path,&dummy);
2405 if(!dev->is_mounted)
2406 yaffsfs_SetError(-EINVAL);
2407 else if(dev->read_only)
2408 yaffsfs_SetError(-EROFS);
2411 yaffs_flush_whole_cache(dev);
2412 yaffs_checkpoint_save(dev);
2417 yaffsfs_SetError(-ENODEV);
2424 static int yaffsfs_IsDevBusy(struct yaffs_dev * dev)
2427 struct yaffs_obj *obj;
2429 for(i = 0; i < YAFFSFS_N_HANDLES; i++){
2430 obj = yaffsfs_HandleToObject(i);
2431 if(obj && obj->my_dev == dev)
2438 int yaffs_remount(const YCHAR *path, int force, int read_only)
2441 struct yaffs_dev *dev=NULL;
2444 yaffsfs_SetError(-EFAULT);
2448 if(yaffsfs_CheckPath(path) < 0){
2449 yaffsfs_SetError(-ENAMETOOLONG);
2454 dev = yaffsfs_FindMountPoint(path);
2456 if(dev->is_mounted){
2457 yaffs_flush_whole_cache(dev);
2459 if(force || ! yaffsfs_IsDevBusy(dev)){
2461 yaffs_checkpoint_save(dev);
2462 dev->read_only = read_only ? 1 : 0;
2465 yaffsfs_SetError(-EBUSY);
2468 yaffsfs_SetError(-EINVAL);
2472 yaffsfs_SetError(-ENODEV);
2479 int yaffs_unmount2(const YCHAR *path, int force)
2482 struct yaffs_dev *dev=NULL;
2485 yaffsfs_SetError(-EFAULT);
2489 if(yaffsfs_CheckPath(path) < 0){
2490 yaffsfs_SetError(-ENAMETOOLONG);
2495 dev = yaffsfs_FindMountPoint(path);
2497 if(dev->is_mounted){
2499 yaffs_flush_whole_cache(dev);
2500 yaffs_checkpoint_save(dev);
2501 inUse = yaffsfs_IsDevBusy(dev);
2502 if(!inUse || force){
2504 yaffsfs_BreakDeviceHandles(dev);
2505 yaffs_deinitialise(dev);
2509 yaffsfs_SetError(-EBUSY);
2512 yaffsfs_SetError(-EINVAL);
2515 yaffsfs_SetError(-ENODEV);
2522 int yaffs_unmount(const YCHAR *path)
2524 return yaffs_unmount2(path,0);
2527 loff_t yaffs_freespace(const YCHAR *path)
2530 struct yaffs_dev *dev=NULL;
2534 yaffsfs_SetError(-EFAULT);
2538 if(yaffsfs_CheckPath(path) < 0){
2539 yaffsfs_SetError(-ENAMETOOLONG);
2544 dev = yaffsfs_FindDevice(path,&dummy);
2545 if(dev && dev->is_mounted){
2546 retVal = yaffs_get_n_free_chunks(dev);
2547 retVal *= dev->data_bytes_per_chunk;
2550 yaffsfs_SetError(-EINVAL);
2556 loff_t yaffs_totalspace(const YCHAR *path)
2559 struct yaffs_dev *dev=NULL;
2563 yaffsfs_SetError(-EFAULT);
2567 if(yaffsfs_CheckPath(path) < 0){
2568 yaffsfs_SetError(-ENAMETOOLONG);
2573 dev = yaffsfs_FindDevice(path,&dummy);
2574 if(dev && dev->is_mounted){
2575 retVal = (dev->param.end_block - dev->param.start_block + 1) -
2576 dev->param.n_reserved_blocks;
2577 retVal *= dev->param.chunks_per_block;
2578 retVal *= dev->data_bytes_per_chunk;
2581 yaffsfs_SetError(-EINVAL);
2587 int yaffs_inodecount(const YCHAR *path)
2590 struct yaffs_dev *dev=NULL;
2594 yaffsfs_SetError(-EFAULT);
2598 if(yaffsfs_CheckPath(path) < 0){
2599 yaffsfs_SetError(-ENAMETOOLONG);
2604 dev = yaffsfs_FindDevice(path,&dummy);
2605 if(dev && dev->is_mounted) {
2606 int n_obj = dev->n_obj;
2607 if(n_obj > dev->n_hardlinks)
2608 retVal = n_obj - dev->n_hardlinks;
2612 yaffsfs_SetError(-EINVAL);
2619 void yaffs_add_device(struct yaffs_dev *dev)
2621 dev->is_mounted = 0;
2622 dev->param.remove_obj_fn = yaffsfs_RemoveObjectCallback;
2624 if(!dev->dev_list.next)
2625 INIT_LIST_HEAD(&dev->dev_list);
2627 list_add(&dev->dev_list,&yaffsfs_deviceList);
2630 void yaffs_remove_device(struct yaffs_dev *dev)
2632 list_del_init(&dev->dev_list);
2638 /* Directory search stuff. */
2641 * Directory search context
2643 * NB this is an opaque structure.
2650 yaffs_dirent de; /* directory entry being used by this dsc */
2651 YCHAR name[NAME_MAX+1]; /* name of directory being searched */
2652 struct yaffs_obj *dirObj; /* ptr to directory being searched */
2653 struct yaffs_obj *nextReturn; /* obj to be returned by next readddir */
2655 struct list_head others;
2656 } yaffsfs_DirectorySearchContext;
2660 static struct list_head search_contexts;
2663 static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
2667 dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2671 if( list_empty(&dsc->dirObj->variant.dir_variant.children))
2672 dsc->nextReturn = NULL;
2674 dsc->nextReturn = list_entry(dsc->dirObj->variant.dir_variant.children.next,
2675 struct yaffs_obj,siblings);
2677 /* Hey someone isn't playing nice! */
2681 static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
2685 dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2687 if( dsc->nextReturn == NULL ||
2688 list_empty(&dsc->dirObj->variant.dir_variant.children))
2689 dsc->nextReturn = NULL;
2691 struct list_head *next = dsc->nextReturn->siblings.next;
2693 if( next == &dsc->dirObj->variant.dir_variant.children)
2694 dsc->nextReturn = NULL; /* end of list */
2696 dsc->nextReturn = list_entry(next,struct yaffs_obj,siblings);
2699 /* Hey someone isn't playing nice! */
2703 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj)
2706 struct list_head *i;
2707 yaffsfs_DirectorySearchContext *dsc;
2709 /* if search contexts not initilised then skip */
2710 if(!search_contexts.next)
2713 /* Iterate through the directory search contexts.
2714 * If any are the one being removed, then advance the dsc to
2715 * the next one to prevent a hanging ptr.
2717 list_for_each(i, &search_contexts) {
2719 dsc = list_entry(i, yaffsfs_DirectorySearchContext,others);
2720 if(dsc->nextReturn == obj)
2721 yaffsfs_DirAdvance(dsc);
2727 yaffs_DIR *yaffs_opendir(const YCHAR *dirname)
2729 yaffs_DIR *dir = NULL;
2730 struct yaffs_obj *obj = NULL;
2731 yaffsfs_DirectorySearchContext *dsc = NULL;
2736 yaffsfs_SetError(-EFAULT);
2740 if(yaffsfs_CheckPath(dirname) < 0){
2741 yaffsfs_SetError(-ENAMETOOLONG);
2747 obj = yaffsfs_FindObject(NULL,dirname,0,1,NULL,¬Dir,&loop);
2750 yaffsfs_SetError(-ENOTDIR);
2752 yaffsfs_SetError(-ELOOP);
2754 yaffsfs_SetError(-ENOENT);
2755 else if(obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
2756 yaffsfs_SetError(-ENOTDIR);
2759 dsc = kmalloc(sizeof(yaffsfs_DirectorySearchContext), 0);
2760 dir = (yaffs_DIR *)dsc;
2763 memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
2764 dsc->magic = YAFFS_MAGIC;
2766 strncpy(dsc->name,dirname,NAME_MAX);
2767 INIT_LIST_HEAD(&dsc->others);
2769 if(!search_contexts.next)
2770 INIT_LIST_HEAD(&search_contexts);
2772 list_add(&dsc->others,&search_contexts);
2773 yaffsfs_SetDirRewound(dsc);
2783 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
2785 yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2786 struct yaffs_dirent *retVal = NULL;
2790 if(dsc && dsc->magic == YAFFS_MAGIC){
2791 yaffsfs_SetError(0);
2792 if(dsc->nextReturn){
2793 dsc->de.d_ino = yaffs_get_equivalent_obj(dsc->nextReturn)->obj_id;
2794 dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
2795 dsc->de.d_off = dsc->offset++;
2796 yaffs_get_obj_name(dsc->nextReturn,dsc->de.d_name,NAME_MAX);
2797 if(strnlen(dsc->de.d_name,NAME_MAX+1) == 0)
2799 /* this should not happen! */
2800 strcpy(dsc->de.d_name,_Y("zz"));
2802 dsc->de.d_reclen = sizeof(struct yaffs_dirent);
2804 yaffsfs_DirAdvance(dsc);
2808 yaffsfs_SetError(-EBADF);
2817 void yaffs_rewinddir(yaffs_DIR *dirp)
2819 yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2823 yaffsfs_SetDirRewound(dsc);
2829 int yaffs_closedir(yaffs_DIR *dirp)
2831 yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2834 yaffsfs_SetError(-EFAULT);
2840 list_del(&dsc->others); /* unhook from list */
2846 /* End of directory stuff */
2849 int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath)
2851 struct yaffs_obj *parent = NULL;
2852 struct yaffs_obj *obj;
2855 int mode = 0; /* ignore for now */
2859 if(!oldpath || !newpath){
2860 yaffsfs_SetError(-EFAULT);
2864 if(yaffsfs_CheckPath(newpath) < 0 ||
2865 yaffsfs_CheckPath(oldpath) < 0){
2866 yaffsfs_SetError(-ENAMETOOLONG);
2871 parent = yaffsfs_FindDirectory(NULL,newpath,&name,0,¬Dir,&loop);
2872 if(!parent && notDir)
2873 yaffsfs_SetError(-ENOTDIR);
2875 yaffsfs_SetError(-ELOOP);
2876 else if( !parent || strnlen(name,5) < 1)
2877 yaffsfs_SetError(-ENOENT);
2878 else if(parent->my_dev->read_only)
2879 yaffsfs_SetError(-EROFS);
2881 obj = yaffs_create_symlink(parent,name,mode,0,0,oldpath);
2884 else if (yaffsfs_FindObject(NULL,newpath,0,0, NULL,NULL,NULL))
2885 yaffsfs_SetError(-EEXIST);
2887 yaffsfs_SetError(-ENOSPC);
2896 int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz)
2898 struct yaffs_obj *obj = NULL;
2899 struct yaffs_obj *dir = NULL;
2905 yaffsfs_SetError(-EFAULT);
2911 obj = yaffsfs_FindObject(NULL,path,0,1, &dir,¬Dir,&loop);
2914 yaffsfs_SetError(-ENOTDIR);
2916 yaffsfs_SetError(-ELOOP);
2917 else if(!dir || !obj)
2918 yaffsfs_SetError(-ENOENT);
2919 else if(obj->variant_type != YAFFS_OBJECT_TYPE_SYMLINK)
2920 yaffsfs_SetError(-EINVAL);
2922 YCHAR *alias = obj->variant.symlink_variant.alias;
2923 memset(buf,0,bufsiz);
2924 strncpy(buf,alias,bufsiz - 1);
2931 int yaffs_link(const YCHAR *oldpath, const YCHAR *linkpath)
2933 /* Creates a link called newpath to existing oldpath */
2934 struct yaffs_obj *obj = NULL;
2935 struct yaffs_obj *lnk = NULL;
2936 struct yaffs_obj *obj_dir = NULL;
2937 struct yaffs_obj *lnk_dir = NULL;
2945 if(!oldpath || !linkpath){
2946 yaffsfs_SetError(-EFAULT);
2950 if(yaffsfs_CheckPath(linkpath) < 0 ||
2951 yaffsfs_CheckPath(oldpath) < 0){
2952 yaffsfs_SetError(-ENAMETOOLONG);
2958 obj = yaffsfs_FindObject(NULL,oldpath,0,1,&obj_dir,¬DirObj,&objLoop);
2959 lnk = yaffsfs_FindObject(NULL,linkpath,0,0,NULL,NULL,NULL);
2960 lnk_dir = yaffsfs_FindDirectory(NULL,linkpath,&newname,0,¬DirLnk,&lnkLoop);
2962 if((!obj_dir && notDirObj) || (!lnk_dir && notDirLnk))
2963 yaffsfs_SetError(-ENOTDIR);
2964 else if(objLoop || lnkLoop)
2965 yaffsfs_SetError(-ELOOP);
2966 else if(!obj_dir || !lnk_dir || !obj)
2967 yaffsfs_SetError(-ENOENT);
2968 else if(obj->my_dev->read_only)
2969 yaffsfs_SetError(-EROFS);
2971 yaffsfs_SetError(-EEXIST);
2972 else if(lnk_dir->my_dev != obj->my_dev)
2973 yaffsfs_SetError(-EXDEV);
2975 retVal = yaffsfs_CheckNameLength(newname);
2978 lnk = yaffs_link_obj(lnk_dir,newname,obj);
2982 yaffsfs_SetError(-ENOSPC);
2992 int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev)
2998 yaffsfs_SetError(-EINVAL);
3004 * D E B U G F U N C T I O N S
3009 * Returns number of handles attached to the object
3011 int yaffs_n_handles(const YCHAR *path)
3013 struct yaffs_obj *obj;
3016 yaffsfs_SetError(-EFAULT);
3020 if(yaffsfs_CheckPath(path) < 0){
3021 yaffsfs_SetError(-ENAMETOOLONG);
3025 obj = yaffsfs_FindObject(NULL,path,0,1,NULL,NULL,NULL);
3028 return yaffsfs_CountHandles(obj);
3033 int yaffs_get_error(void)
3035 return yaffsfs_GetLastError();
3038 int yaffs_set_error(int error)
3040 yaffsfs_SetError(error);
3044 int yaffs_dump_dev(const YCHAR *path)
3051 struct yaffs_obj *obj = yaffsfs_FindRoot(path,&rest);
3054 struct yaffs_dev *dev = obj->my_dev;
3057 "n_page_writes.......... %d\n"
3058 "n_page_reads........... %d\n"
3059 "n_erasures....... %d\n"
3060 "n_gc_copies............ %d\n"
3061 "garbageCollections... %d\n"
3062 "passiveGarbageColl'ns %d\n"
3068 dev->garbageCollections,
3069 dev->passiveGarbageCollections