2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU 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 yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const YCHAR *path, int symDepth);
35 static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj);
37 unsigned int yaffs_wr_attempts;
41 * There are open inodes in yaffsfs_Inode.
42 * There are open handles in yaffsfs_Handle.
44 * Things are structured this way to be like the Linux VFS model
45 * so that interactions with the yaffs guts calls are similar.
46 * That means more common code paths and less special code.
47 * That means better testing etc.
51 int count; /* Number of handles accessing this inode */
58 int inodeId:13; /* Index to corresponding yaffsfs_Inode */
59 int useCount:16; /* Use count for this handle */
60 __u32 position; /* current position in file */
63 static yaffsfs_Inode yaffsfs_inode[YAFFSFS_N_HANDLES];
64 static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
68 * Inilitalise handle management on start-up.
71 static int yaffsfs_InitHandles(void)
74 memset(yaffsfs_inode,0,sizeof(yaffsfs_inode));
75 memset(yaffsfs_handle,0,sizeof(yaffsfs_handle));
76 for(i = 0; i < YAFFSFS_N_HANDLES; i++)
77 yaffsfs_handle[i].inodeId = -1;
82 yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
84 if(h < 0 || h >= YAFFSFS_N_HANDLES)
87 return &yaffsfs_handle[h];
90 yaffsfs_Inode *yaffsfs_GetInodePointer(int handle)
92 yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
94 if(h && h->useCount > 0 && h->inodeId >= 0 && h->inodeId < YAFFSFS_N_HANDLES)
95 return &yaffsfs_inode[h->inodeId];
100 yaffs_Object *yaffsfs_GetHandleObject(int handle)
102 yaffsfs_Inode *in = yaffsfs_GetInodePointer(handle);
111 * yaffsfs_GetInodeIdForObject
112 * Grab an inode entry when opening a new inode.
115 static int yaffsfs_GetInodeIdForObject(yaffs_Object *obj)
119 yaffsfs_Inode *in = NULL;
122 obj = yaffs_GetEquivalentObject(obj);
124 /* Look for it. If we can't find it then make one */
125 for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
126 if(yaffsfs_inode[i].iObj == obj)
130 for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
131 if(!yaffsfs_inode[i].iObj)
137 in = &yaffsfs_inode[ret];
148 static void yaffsfs_ReleaseInode(yaffsfs_Inode *in)
155 yaffs_DeleteObject(obj);
162 static void yaffsfs_PutInode(int inodeId)
164 if(inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES){
165 yaffsfs_Inode *in = & yaffsfs_inode[inodeId];
168 yaffsfs_ReleaseInode(in);
175 * Grab a handle (when opening a file)
178 static int yaffsfs_GetNewHandle(void)
183 for(i = 0; i < YAFFSFS_N_HANDLES; i++){
184 h = yaffsfs_GetHandlePointer(i);
186 /* todo bug: should never happen */
189 memset(h,0,sizeof(yaffsfs_Handle));
200 * Increase use of handle when reading/writing a file
202 static int yaffsfs_GetHandle(int handle)
204 yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
206 if(h && h->useCount > 0){
214 * Let go of a handle when closing a file or aborting an open or
215 * ending a read or write.
217 static int yaffsfs_PutHandle(int handle)
219 yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
221 if(h && h->useCount > 0){
225 yaffsfs_PutInode(h->inodeId);
237 * Stuff to search for a directory from a path
241 int yaffsfs_Match(YCHAR a, YCHAR b)
247 int yaffsfs_IsPathDivider(YCHAR ch)
249 YCHAR *str = YAFFS_PATH_DIVIDERS;
262 YLIST_HEAD(yaffsfs_deviceList);
267 * Scan the configuration list to find the root.
268 * Curveballs: Should match paths that end in '/' too
269 * Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
271 static yaffs_Device *yaffsfs_FindDevice(const YCHAR *path, YCHAR **restOfPath)
273 struct ylist_head *cfg;
274 const YCHAR *leftOver;
276 yaffs_Device *retval = NULL;
277 yaffs_Device *dev = NULL;
279 int longestMatch = -1;
283 * Check all configs, choose the one that:
284 * 1) Actually matches a prefix (ie /a amd /abc will not match
285 * 2) Matches the longest.
287 ylist_for_each(cfg, &yaffsfs_deviceList){
288 dev = ylist_entry(cfg, yaffs_Device, devList);
295 while(matching && *p && *leftOver){
296 /* Skip over any /s */
297 while(yaffsfs_IsPathDivider(*p))
300 /* Skip over any /s */
301 while(yaffsfs_IsPathDivider(*leftOver))
304 /* Now match the text part */
306 *p && !yaffsfs_IsPathDivider(*p) &&
307 *leftOver && !yaffsfs_IsPathDivider(*leftOver)){
308 if(yaffsfs_Match(*p,*leftOver)){
318 /* Skip over any /s in leftOver */
319 while(yaffsfs_IsPathDivider(*leftOver))
322 // Skip over any /s in p
323 while(yaffsfs_IsPathDivider(*p))
326 // p should now be at the end of the string (ie. fully matched)
330 if( matching && (thisMatchLength > longestMatch))
333 *restOfPath = (YCHAR *)leftOver;
335 longestMatch = thisMatchLength;
343 static yaffs_Device *yaffsfs_FindDevice(const YCHAR *path, YCHAR **restOfPath)
345 yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList;
346 const YCHAR *leftOver;
348 yaffs_Device *retval = NULL;
350 int longestMatch = -1;
353 * Check all configs, choose the one that:
354 * 1) Actually matches a prefix (ie /a amd /abc will not match
355 * 2) Matches the longest.
357 while(cfg && cfg->prefix && cfg->dev){
362 while(*p && /* unmatched part of prefix */
363 !(yaffsfs_IsPathDivider(*p) && (p[1] == 0)) &&
364 *leftOver && yaffsfs_Match(*p,*leftOver)){
371 if((!*p || (yaffsfs_IsPathDivider(*p) && (p[1] == 0))) && /* end of prefix */
372 (!*leftOver || yaffsfs_IsPathDivider(*leftOver)) && /* no more in this path name part */
373 (thisMatchLength > longestMatch)){
375 *restOfPath = (YCHAR *)leftOver;
377 longestMatch = thisMatchLength;
385 static yaffs_Object *yaffsfs_FindRoot(const YCHAR *path, YCHAR **restOfPath)
390 dev= yaffsfs_FindDevice(path,restOfPath);
391 if(dev && dev->isMounted){
397 static yaffs_Object *yaffsfs_FollowLink(yaffs_Object *obj,int symDepth)
400 while(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
401 YCHAR *alias = obj->variant.symLinkVariant.alias;
403 if(yaffsfs_IsPathDivider(*alias))
404 /* Starts with a /, need to scan from root up */
405 obj = yaffsfs_FindObject(NULL,alias,symDepth++);
407 /* Relative to here, so use the parent of the symlink as a start */
408 obj = yaffsfs_FindObject(obj->parent,alias,symDepth++);
415 * yaffsfs_FindDirectory
416 * Parse a path to determine the directory and the name within the directory.
418 * eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
420 static yaffs_Object *yaffsfs_DoFindDirectory(yaffs_Object *startDir,
421 const YCHAR *path, YCHAR **name, int symDepth)
425 YCHAR str[YAFFS_MAX_NAME_LENGTH+1];
428 if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES)
433 restOfPath = (YCHAR *)path;
436 dir = yaffsfs_FindRoot(path,&restOfPath);
441 * curve ball: also throw away surplus '/'
442 * eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
444 while(yaffsfs_IsPathDivider(*restOfPath))
445 restOfPath++; /* get rid of '/' */
450 while(*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)){
451 if (i < YAFFS_MAX_NAME_LENGTH){
452 str[i] = *restOfPath;
460 /* got to the end of the string */
463 if(yaffs_strcmp(str,_Y(".")) == 0)
467 else if(yaffs_strcmp(str,_Y("..")) == 0)
470 dir = yaffs_FindObjectByName(dir,str);
472 while(dir && dir->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
473 dir = yaffsfs_FollowLink(dir,symDepth);
476 if(dir && dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
481 /* directory did not exist. */
485 static yaffs_Object *yaffsfs_FindDirectory(yaffs_Object *relativeDirectory,
486 const YCHAR *path,YCHAR **name,int symDepth)
488 return yaffsfs_DoFindDirectory(relativeDirectory,path,name,symDepth);
492 * yaffsfs_FindObject turns a path for an existing object into the object
494 static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const YCHAR *path,int symDepth)
499 dir = yaffsfs_FindDirectory(relativeDirectory,path,&name,symDepth);
502 return yaffs_FindObjectByName(dir,name);
508 int yaffs_dup(int fd)
511 yaffsfs_Handle *oldPtr = NULL;
512 yaffsfs_Handle *newPtr = NULL;
516 oldPtr = yaffsfs_GetHandlePointer(fd);
517 if(oldPtr && oldPtr->useCount > 0)
518 newHandle = yaffsfs_GetNewHandle();
520 newPtr = yaffsfs_GetHandlePointer(newHandle);
528 yaffsfs_SetError(-EBADF);
530 yaffsfs_SetError(-ENOMEM);
536 int yaffs_open(const YCHAR *path, int oflag, int mode)
538 yaffs_Object *obj = NULL;
539 yaffs_Object *dir = NULL;
542 yaffsfs_Handle *h = NULL;
545 int errorReported = 0;
547 /* O_EXCL only has meaning if O_CREAT is specified */
548 if(!(oflag & O_CREAT))
551 /* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
552 if( (oflag & O_CREAT) & (oflag & O_EXCL))
555 /* Todo: Are there any more flag combos to sanitise ? */
560 handle = yaffsfs_GetNewHandle();
564 h = yaffsfs_GetHandlePointer(handle);
567 /* try to find the exisiting object */
568 obj = yaffsfs_FindObject(NULL,path,0);
570 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
571 obj = yaffsfs_FollowLink(obj,symDepth++);
574 obj = yaffs_GetEquivalentObject(obj);
576 if(obj && obj->variantType != YAFFS_OBJECT_TYPE_FILE)
581 /* The file already exists */
583 /* Open should fail if O_CREAT and O_EXCL are specified since
586 if((oflag & O_EXCL) && (oflag & O_CREAT)){
588 yaffsfs_SetError(-EEXIST);
592 /* Check file permissions */
593 if( (oflag & (O_RDWR | O_WRONLY)) == 0 && /* ie O_RDONLY */
594 !(obj->yst_mode & S_IREAD))
597 if( (oflag & O_RDWR) &&
598 !(obj->yst_mode & S_IREAD))
601 if( (oflag & (O_RDWR | O_WRONLY)) &&
602 !(obj->yst_mode & S_IWRITE))
605 } else if((oflag & O_CREAT)) {
606 /* Let's see if we can create this file */
607 dir = yaffsfs_FindDirectory(NULL,path,&name,0);
608 if(dir && dir->myDev->readOnly){
609 yaffsfs_SetError(-EINVAL);
612 obj = yaffs_MknodFile(dir,name,mode,0,0);
614 yaffsfs_SetError(-ENOTDIR);
619 if(obj && !openDenied) {
620 int inodeId = yaffsfs_GetInodeIdForObject(obj);
624 * Todo: Fix any problem if inodes run out, though that
625 * can't happen if the number of inode items >= number of handles.
629 h->inodeId = inodeId;
630 h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1;
631 h->append = (oflag & O_APPEND) ? 1 : 0;
634 /* Hook inode to object */
635 obj->myInode = (void*) &yaffsfs_inode[inodeId];
637 if((oflag & O_TRUNC) && !h->readOnly)
638 yaffs_ResizeFile(obj,0);
640 yaffsfs_PutHandle(handle);
642 yaffsfs_SetError(-EACCES);
654 int yaffs_Dofsync(int fd,int datasync)
656 yaffsfs_Handle *h = NULL;
661 h = yaffsfs_GetHandlePointer(fd);
663 if(h && h->useCount > 0)
665 yaffs_FlushFile(yaffsfs_inode[h->inodeId].iObj,1,datasync);
668 yaffsfs_SetError(-EBADF);
677 int yaffs_fsync(int fd)
679 return yaffs_Dofsync(fd,0);
682 int yaffs_flush(int fd)
684 return yaffs_fsync(fd);
687 int yaffs_fdatasync(int fd)
689 return yaffs_Dofsync(fd,1);
692 int yaffs_close(int fd)
694 yaffsfs_Handle *h = NULL;
699 h = yaffsfs_GetHandlePointer(fd);
701 if(h && h->useCount > 0) {
703 yaffs_FlushFile(yaffsfs_inode[h->inodeId].iObj,1,0);
704 yaffsfs_PutHandle(fd);
708 yaffsfs_SetError(-EBADF);
719 int yaffsfs_do_read(int fd, void *vbuf, unsigned int nbyte, int isPread, int offset)
721 yaffsfs_Handle *h = NULL;
722 yaffs_Object *obj = NULL;
728 unsigned int maxRead;
729 __u8 *buf = (__u8 *)vbuf;
732 h = yaffsfs_GetHandlePointer(fd);
733 obj = yaffsfs_GetHandleObject(fd);
737 yaffsfs_SetError(-EBADF);
739 } else if( h && obj){
743 startPos = h->position;
747 if(yaffs_GetObjectFileLength(obj) > pos)
748 maxRead = yaffs_GetObjectFileLength(obj) - pos;
756 yaffsfs_GetHandle(fd);
759 nToRead = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
762 nRead = yaffs_ReadDataFromFile(obj,buf,pos,nToRead);
773 nbyte = 0; /* no more to read */
783 yaffsfs_PutHandle(fd);
787 h->position = startPos + totalRead;
797 return (totalRead >= 0) ? totalRead : -1;
801 int yaffs_read(int fd, void *buf, unsigned int nbyte)
803 return yaffsfs_do_read(fd, buf, nbyte, 0, 0);
806 int yaffs_pread(int fd, void *buf, unsigned int nbyte, unsigned int offset)
808 return yaffsfs_do_read(fd, buf, nbyte, 1, offset);
811 int yaffsfs_do_write(int fd, const void *vbuf, unsigned int nbyte, int isPwrite, int offset)
813 yaffsfs_Handle *h = NULL;
814 yaffs_Object *obj = NULL;
818 int totalWritten = 0;
819 int writeThrough = 0;
821 const __u8 *buf = (const __u8 *)vbuf;
824 h = yaffsfs_GetHandlePointer(fd);
825 obj = yaffsfs_GetHandleObject(fd);
829 yaffsfs_SetError(-EBADF);
831 } else if( h && obj && (h->readOnly || obj->myDev->readOnly)){
832 yaffsfs_SetError(-EINVAL);
834 } else if( h && obj){
836 startPos = yaffs_GetObjectFileLength(obj);
840 startPos = h->position;
842 yaffsfs_GetHandle(fd);
845 nToWrite = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
849 nWritten = yaffs_WriteDataToFile(obj,buf,pos,nToWrite,writeThrough);
851 totalWritten += nWritten;
856 if(nWritten == nToWrite)
861 if(nWritten < 1 && totalWritten < 1){
862 yaffsfs_SetError(-ENOSPC);
872 yaffsfs_PutHandle(fd);
876 h->position = startPos + totalWritten;
885 return (totalWritten >= 0) ? totalWritten : -1;
888 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
890 return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
893 int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, unsigned int offset)
895 return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
899 int yaffs_truncate(const YCHAR *path,off_t newSize)
901 yaffs_Object *obj = NULL;
902 int result = YAFFS_FAIL;
906 obj = yaffsfs_FindObject(NULL,path,0);
908 obj = yaffs_GetEquivalentObject(obj);
911 yaffsfs_SetError(-ENOENT);
912 else if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
913 yaffsfs_SetError(-EISDIR);
914 else if(obj->myDev->readOnly)
915 yaffsfs_SetError(-EINVAL);
917 result = yaffs_ResizeFile(obj,newSize);
922 return (result) ? 0 : -1;
925 int yaffs_ftruncate(int fd, off_t newSize)
927 yaffsfs_Handle *h = NULL;
928 yaffs_Object *obj = NULL;
932 h = yaffsfs_GetHandlePointer(fd);
933 obj = yaffsfs_GetHandleObject(fd);
937 yaffsfs_SetError(-EBADF);
938 else if(obj->myDev->readOnly)
939 yaffsfs_SetError(-EINVAL);
941 /* resize the file */
942 result = yaffs_ResizeFile(obj,newSize);
946 return (result) ? 0 : -1;
950 off_t yaffs_lseek(int fd, off_t offset, int whence)
952 yaffsfs_Handle *h = NULL;
953 yaffs_Object *obj = NULL;
958 h = yaffsfs_GetHandlePointer(fd);
959 obj = yaffsfs_GetHandleObject(fd);
963 yaffsfs_SetError(-EBADF);
964 else if(whence == SEEK_SET){
968 else if(whence == SEEK_CUR) {
969 if( (h->position + offset) >= 0)
970 pos = (h->position + offset);
972 else if(whence == SEEK_END) {
973 fSize = yaffs_GetObjectFileLength(obj);
974 if(fSize >= 0 && (fSize + offset) >= 0)
975 pos = fSize + offset;
991 int yaffsfs_DoUnlink(const YCHAR *path,int isDirectory)
993 yaffs_Object *dir = NULL;
994 yaffs_Object *obj = NULL;
996 int result = YAFFS_FAIL;
1000 obj = yaffsfs_FindObject(NULL,path,0);
1001 dir = yaffsfs_FindDirectory(NULL,path,&name,0);
1003 yaffsfs_SetError(-ENOTDIR);
1005 yaffsfs_SetError(-ENOENT);
1006 else if(obj->myDev->readOnly)
1007 yaffsfs_SetError(-EINVAL);
1008 else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1009 yaffsfs_SetError(-EISDIR);
1010 else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
1011 yaffsfs_SetError(-ENOTDIR);
1013 result = yaffs_Unlink(dir,name);
1015 if(result == YAFFS_FAIL && isDirectory)
1016 yaffsfs_SetError(-ENOTEMPTY);
1023 return (result == YAFFS_FAIL) ? -1 : 0;
1027 int yaffs_rmdir(const YCHAR *path)
1029 return yaffsfs_DoUnlink(path,1);
1032 int yaffs_unlink(const YCHAR *path)
1034 return yaffsfs_DoUnlink(path,0);
1037 int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
1039 yaffs_Object *olddir = NULL;
1040 yaffs_Object *newdir = NULL;
1041 yaffs_Object *obj = NULL;
1044 int result= YAFFS_FAIL;
1045 int renameAllowed = 1;
1049 olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
1050 newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
1051 obj = yaffsfs_FindObject(NULL,oldPath,0);
1053 if(!olddir || !newdir || !obj) {
1055 yaffsfs_SetError(-EBADF);
1057 } else if(obj->myDev->readOnly){
1058 yaffsfs_SetError(-EINVAL);
1060 } else if(olddir->myDev != newdir->myDev) {
1061 /* oops must be on same device */
1063 yaffsfs_SetError(-EXDEV);
1065 } else if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
1067 * It is a directory, check that it is not being renamed to
1068 * being its own decendent.
1069 * Do this by tracing from the new directory back to the root, checking for obj
1072 yaffs_Object *xx = newdir;
1074 while( renameAllowed && xx){
1080 yaffsfs_SetError(-EACCES);
1084 result = yaffs_RenameObject(olddir,oldname,newdir,newname);
1088 return (result == YAFFS_FAIL) ? -1 : 0;
1092 static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
1097 obj = yaffs_GetEquivalentObject(obj);
1100 buf->st_dev = (int)obj->myDev->osContext;
1101 buf->st_ino = obj->objectId;
1102 buf->st_mode = obj->yst_mode & ~S_IFMT; /* clear out file type bits */
1104 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1105 buf->st_mode |= S_IFDIR;
1106 else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
1107 buf->st_mode |= S_IFLNK;
1108 else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
1109 buf->st_mode |= S_IFREG;
1111 buf->st_nlink = yaffs_GetObjectLinkCount(obj);
1114 buf->st_rdev = obj->yst_rdev;
1115 buf->st_size = yaffs_GetObjectFileLength(obj);
1116 buf->st_blksize = obj->myDev->nDataBytesPerChunk;
1117 buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
1118 #if CONFIG_YAFFS_WINCE
1119 buf->yst_wince_atime[0] = obj->win_atime[0];
1120 buf->yst_wince_atime[1] = obj->win_atime[1];
1121 buf->yst_wince_ctime[0] = obj->win_ctime[0];
1122 buf->yst_wince_ctime[1] = obj->win_ctime[1];
1123 buf->yst_wince_mtime[0] = obj->win_mtime[0];
1124 buf->yst_wince_mtime[1] = obj->win_mtime[1];
1126 buf->yst_atime = obj->yst_atime;
1127 buf->yst_ctime = obj->yst_ctime;
1128 buf->yst_mtime = obj->yst_mtime;
1135 static int yaffsfs_DoStatOrLStat(const YCHAR *path, struct yaffs_stat *buf,int doLStat)
1142 obj = yaffsfs_FindObject(NULL,path,0);
1145 obj = yaffsfs_FollowLink(obj,0);
1148 retVal = yaffsfs_DoStat(obj,buf);
1150 /* todo error not found */
1151 yaffsfs_SetError(-ENOENT);
1159 int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
1161 return yaffsfs_DoStatOrLStat(path,buf,0);
1164 int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
1166 return yaffsfs_DoStatOrLStat(path,buf,1);
1169 int yaffs_fstat(int fd, struct yaffs_stat *buf)
1176 obj = yaffsfs_GetHandleObject(fd);
1179 retVal = yaffsfs_DoStat(obj,buf);
1182 yaffsfs_SetError(-EBADF);
1189 #ifndef CONFIG_YAFFS_WINCE
1190 /* xattrib functions */
1193 static int yaffs_do_setxattr(const YCHAR *path, const char *name, const void *data, int size, int flags, int follow)
1200 obj = yaffsfs_FindObject(NULL,path,0);
1203 obj = yaffsfs_FollowLink(obj,0);
1206 retVal = yaffs_SetXAttribute(obj,name,data,size,flags);
1208 yaffsfs_SetError(retVal);
1212 /* todo error not found */
1213 yaffsfs_SetError(-ENOENT);
1221 int yaffs_setxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1223 return yaffs_do_setxattr(path, name, data, size, flags, 1);
1226 int yaffs_lsetxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1228 return yaffs_do_setxattr(path, name, data, size, flags, 0);
1233 int yaffs_fsetxattr(int fd, const char *name, const void *data, int size, int flags)
1240 obj = yaffsfs_GetHandleObject(fd);
1243 retVal = yaffs_SetXAttribute(obj,name,data,size,flags);
1245 yaffsfs_SetError(retVal);
1250 yaffsfs_SetError(-EBADF);
1257 static int yaffs_do_getxattr(const YCHAR *path, const char *name, void *data, int size, int follow)
1264 obj = yaffsfs_FindObject(NULL,path,0);
1267 obj = yaffsfs_FollowLink(obj,0);
1270 retVal = yaffs_GetXAttribute(obj,name,data,size);
1272 yaffsfs_SetError(retVal);
1276 /* todo error not found */
1277 yaffsfs_SetError(-ENOENT);
1285 int yaffs_getxattr(const YCHAR *path, const char *name, void *data, int size)
1287 return yaffs_do_getxattr( path, name, data, size, 1);
1289 int yaffs_lgetxattr(const YCHAR *path, const char *name, void *data, int size)
1291 return yaffs_do_getxattr( path, name, data, size, 0);
1296 int yaffs_fgetxattr(int fd, const char *name, void *data, int size)
1303 obj = yaffsfs_GetHandleObject(fd);
1306 retVal = yaffs_GetXAttribute(obj,name,data,size);
1308 yaffsfs_SetError(retVal);
1313 yaffsfs_SetError(-EBADF);
1320 static int yaffs_do_listxattr(const YCHAR *path, char *data, int size, int follow)
1327 obj = yaffsfs_FindObject(NULL,path,0);
1330 obj = yaffsfs_FollowLink(obj,0);
1333 retVal = yaffs_ListXAttributes(obj, data,size);
1335 yaffsfs_SetError(retVal);
1339 /* todo error not found */
1340 yaffsfs_SetError(-ENOENT);
1348 int yaffs_listxattr(const YCHAR *path, char *data, int size)
1350 return yaffs_do_listxattr(path, data, size, 1);
1353 int yaffs_llistxattr(const YCHAR *path, char *data, int size)
1355 return yaffs_do_listxattr(path, data, size, 0);
1358 int yaffs_flistxattr(int fd, char *data, int size)
1365 obj = yaffsfs_GetHandleObject(fd);
1368 retVal = yaffs_ListXAttributes(obj,data,size);
1370 yaffsfs_SetError(retVal);
1375 yaffsfs_SetError(-EBADF);
1382 static int yaffs_do_removexattr(const YCHAR *path, const char *name, int follow)
1389 obj = yaffsfs_FindObject(NULL,path,0);
1392 obj = yaffsfs_FollowLink(obj,0);
1395 retVal = yaffs_RemoveXAttribute(obj,name);
1397 yaffsfs_SetError(retVal);
1401 /* todo error not found */
1402 yaffsfs_SetError(-ENOENT);
1410 int yaffs_removexattr(const YCHAR *path, const char *name)
1412 return yaffs_do_removexattr(path, name, 1);
1415 int yaffs_lremovexattr(const YCHAR *path, const char *name)
1417 return yaffs_do_removexattr(path, name, 0);
1420 int yaffs_fremovexattr(int fd, const char *name)
1427 obj = yaffsfs_GetHandleObject(fd);
1430 retVal = yaffs_RemoveXAttribute(obj,name);
1432 yaffsfs_SetError(retVal);
1437 yaffsfs_SetError(-EBADF);
1445 #ifdef CONFIG_YAFFS_WINCE
1446 int yaffs_get_wince_times(int fd, unsigned *wctime, unsigned *watime, unsigned *wmtime)
1453 obj = yaffsfs_GetHandleObject(fd);
1458 wctime[0] = obj->win_ctime[0];
1459 wctime[1] = obj->win_ctime[1];
1462 watime[0] = obj->win_atime[0];
1463 watime[1] = obj->win_atime[1];
1466 wmtime[0] = obj->win_mtime[0];
1467 wmtime[1] = obj->win_mtime[1];
1474 yaffsfs_SetError(-EBADF);
1482 int yaffs_set_wince_times(int fd,
1483 const unsigned *wctime,
1484 const unsigned *watime,
1485 const unsigned *wmtime)
1492 obj = yaffsfs_GetHandleObject(fd);
1497 obj->win_ctime[0] = wctime[0];
1498 obj->win_ctime[1] = wctime[1];
1501 obj->win_atime[0] = watime[0];
1502 obj->win_atime[1] = watime[1];
1505 obj->win_mtime[0] = wmtime[0];
1506 obj->win_mtime[1] = wmtime[1];
1510 result = yaffs_FlushFile(obj,0,0);
1514 yaffsfs_SetError(-EBADF);
1524 static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
1529 obj = yaffs_GetEquivalentObject(obj);
1532 obj->yst_mode = mode;
1534 result = yaffs_FlushFile(obj,0,0);
1537 return result == YAFFS_OK ? 0 : -1;
1541 int yaffs_access(const YCHAR *path, int amode)
1548 obj = yaffsfs_FindObject(NULL,path,0);
1553 if((amode & R_OK) && !(obj->yst_mode & S_IREAD))
1555 if((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
1557 if((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
1561 yaffsfs_SetError(-EACCES);
1565 /* todo error not found */
1566 yaffsfs_SetError(-ENOENT);
1577 int yaffs_chmod(const YCHAR *path, mode_t mode)
1584 obj = yaffsfs_FindObject(NULL,path,0);
1587 yaffsfs_SetError(-ENOENT);
1588 else if(obj->myDev->readOnly)
1589 yaffsfs_SetError(-EINVAL);
1591 retVal = yaffsfs_DoChMod(obj,mode);
1600 int yaffs_fchmod(int fd, mode_t mode)
1607 obj = yaffsfs_GetHandleObject(fd);
1610 yaffsfs_SetError(-ENOENT);
1611 else if(obj->myDev->readOnly)
1612 yaffsfs_SetError(-EINVAL);
1614 retVal = yaffsfs_DoChMod(obj,mode);
1622 int yaffs_mkdir(const YCHAR *path, mode_t mode)
1624 yaffs_Object *parent = NULL;
1625 yaffs_Object *dir = NULL;
1630 parent = yaffsfs_FindDirectory(NULL,path,&name,0);
1631 if(parent && parent->myDev->readOnly){
1632 yaffsfs_SetError(-EINVAL);
1635 dir = yaffs_MknodDirectory(parent,name,mode,0,0);
1640 yaffsfs_SetError(-ENOENT); /* missing path */
1641 else if (yaffs_FindObjectByName(parent,name))
1642 yaffsfs_SetError(-EEXIST); /* the name already exists */
1644 yaffsfs_SetError(-ENOSPC); /* just assume no space */
1654 int yaffs_mount2(const YCHAR *path,int readOnly)
1657 int result=YAFFS_FAIL;
1658 yaffs_Device *dev=NULL;
1661 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Mounting %s" TENDSTR),path));
1664 dev = yaffsfs_FindDevice(path,&dummy);
1666 if(!dev->isMounted){
1667 dev->readOnly = readOnly ? 1 : 0;
1668 result = yaffs_GutsInitialise(dev);
1669 if(result == YAFFS_FAIL)
1670 /* todo error - mount failed */
1671 yaffsfs_SetError(-ENOMEM);
1672 retVal = result ? 0 : -1;
1676 /* todo error - already mounted. */
1677 yaffsfs_SetError(-EBUSY);
1679 /* todo error - no device */
1680 yaffsfs_SetError(-ENODEV);
1687 int yaffs_mount(const YCHAR *path)
1689 return yaffs_mount2(path,0);
1692 int yaffs_sync(const YCHAR *path)
1695 yaffs_Device *dev=NULL;
1699 dev = yaffsfs_FindDevice(path,&dummy);
1703 yaffs_FlushEntireDeviceCache(dev);
1704 yaffs_CheckpointSave(dev);
1708 /* todo error - not mounted. */
1709 yaffsfs_SetError(-EINVAL);
1712 /* todo error - no device */
1713 yaffsfs_SetError(-ENODEV);
1720 int yaffs_remount(const YCHAR *path, int force, int readOnly)
1723 yaffs_Device *dev=NULL;
1727 dev = yaffsfs_FindDevice(path,&dummy);
1733 yaffs_FlushEntireDeviceCache(dev);
1735 for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse && !force; i++){
1736 if(yaffsfs_handle[i].useCount>0 && yaffsfs_inode[yaffsfs_handle[i].inodeId].iObj->myDev == dev)
1737 inUse = 1; /* the device is in use, can't unmount */
1740 if(!inUse || force){
1742 yaffs_CheckpointSave(dev);
1743 dev->readOnly = readOnly ? 1 : 0;
1746 yaffsfs_SetError(-EBUSY);
1749 yaffsfs_SetError(-EINVAL);
1753 yaffsfs_SetError(-ENODEV);
1760 int yaffs_unmount2(const YCHAR *path, int force)
1763 yaffs_Device *dev=NULL;
1767 dev = yaffsfs_FindDevice(path,&dummy);
1773 yaffs_FlushEntireDeviceCache(dev);
1774 yaffs_CheckpointSave(dev);
1776 for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++){
1777 if(yaffsfs_handle[i].useCount > 0 && yaffsfs_inode[yaffsfs_handle[i].inodeId].iObj->myDev == dev)
1778 inUse = 1; /* the device is in use, can't unmount */
1781 if(!inUse || force){
1782 yaffs_Deinitialise(dev);
1786 /* todo error can't unmount as files are open */
1787 yaffsfs_SetError(-EBUSY);
1790 /* todo error - not mounted. */
1791 yaffsfs_SetError(-EINVAL);
1795 /* todo error - no device */
1796 yaffsfs_SetError(-ENODEV);
1803 int yaffs_unmount(const YCHAR *path)
1805 return yaffs_unmount2(path,0);
1808 loff_t yaffs_freespace(const YCHAR *path)
1811 yaffs_Device *dev=NULL;
1815 dev = yaffsfs_FindDevice(path,&dummy);
1816 if(dev && dev->isMounted){
1817 retVal = yaffs_GetNumberOfFreeChunks(dev);
1818 retVal *= dev->nDataBytesPerChunk;
1821 yaffsfs_SetError(-EINVAL);
1827 loff_t yaffs_totalspace(const YCHAR *path)
1830 yaffs_Device *dev=NULL;
1834 dev = yaffsfs_FindDevice(path,&dummy);
1835 if(dev && dev->isMounted){
1836 retVal = (dev->param.endBlock - dev->param.startBlock + 1) - dev->param.nReservedBlocks;
1837 retVal *= dev->param.nChunksPerBlock;
1838 retVal *= dev->nDataBytesPerChunk;
1841 yaffsfs_SetError(-EINVAL);
1847 int yaffs_inodecount(const YCHAR *path)
1850 yaffs_Device *dev=NULL;
1854 dev = yaffsfs_FindDevice(path,&dummy);
1855 if(dev && dev->isMounted) {
1856 int nObjects = dev->nObjects;
1857 if(nObjects > dev->nHardLinks)
1858 retVal = nObjects - dev->nHardLinks;
1862 yaffsfs_SetError(-EINVAL);
1869 void yaffs_AddDevice(yaffs_Device *dev)
1872 dev->param.removeObjectCallback = yaffsfs_RemoveObjectCallback;
1874 if(!dev->devList.next)
1875 YINIT_LIST_HEAD(&dev->devList);
1877 ylist_add(&dev->devList,&yaffsfs_deviceList);
1880 void yaffs_RemoveDevice(yaffs_Device *dev)
1882 ylist_del_init(&dev->devList);
1888 /* Directory search stuff. */
1891 * Directory search context
1893 * NB this is an opaque structure.
1900 yaffs_dirent de; /* directory entry being used by this dsc */
1901 YCHAR name[NAME_MAX+1]; /* name of directory being searched */
1902 yaffs_Object *dirObj; /* ptr to directory being searched */
1903 yaffs_Object *nextReturn; /* obj to be returned by next readddir */
1905 struct ylist_head others;
1906 } yaffsfs_DirectorySearchContext;
1910 static struct ylist_head search_contexts;
1913 static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
1917 dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
1921 if( ylist_empty(&dsc->dirObj->variant.directoryVariant.children))
1922 dsc->nextReturn = NULL;
1924 dsc->nextReturn = ylist_entry(dsc->dirObj->variant.directoryVariant.children.next,
1925 yaffs_Object,siblings);
1927 /* Hey someone isn't playing nice! */
1931 static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
1935 dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
1937 if( dsc->nextReturn == NULL ||
1938 ylist_empty(&dsc->dirObj->variant.directoryVariant.children))
1939 dsc->nextReturn = NULL;
1941 struct ylist_head *next = dsc->nextReturn->siblings.next;
1943 if( next == &dsc->dirObj->variant.directoryVariant.children)
1944 dsc->nextReturn = NULL; /* end of list */
1946 dsc->nextReturn = ylist_entry(next,yaffs_Object,siblings);
1949 /* Hey someone isn't playing nice! */
1953 static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj)
1956 struct ylist_head *i;
1957 yaffsfs_DirectorySearchContext *dsc;
1959 /* if search contexts not initilised then skip */
1960 if(!search_contexts.next)
1963 /* Iterate through the directory search contexts.
1964 * If any are the one being removed, then advance the dsc to
1965 * the next one to prevent a hanging ptr.
1967 ylist_for_each(i, &search_contexts) {
1969 dsc = ylist_entry(i, yaffsfs_DirectorySearchContext,others);
1970 if(dsc->nextReturn == obj)
1971 yaffsfs_DirAdvance(dsc);
1977 yaffs_DIR *yaffs_opendir(const YCHAR *dirname)
1979 yaffs_DIR *dir = NULL;
1980 yaffs_Object *obj = NULL;
1981 yaffsfs_DirectorySearchContext *dsc = NULL;
1985 obj = yaffsfs_FindObject(NULL,dirname,0);
1987 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
1989 dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
1990 dir = (yaffs_DIR *)dsc;
1993 memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
1994 dsc->magic = YAFFS_MAGIC;
1996 yaffs_strncpy(dsc->name,dirname,NAME_MAX);
1997 YINIT_LIST_HEAD(&dsc->others);
1999 if(!search_contexts.next)
2000 YINIT_LIST_HEAD(&search_contexts);
2002 ylist_add(&dsc->others,&search_contexts);
2003 yaffsfs_SetDirRewound(dsc);
2013 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
2015 yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2016 struct yaffs_dirent *retVal = NULL;
2020 if(dsc && dsc->magic == YAFFS_MAGIC){
2021 yaffsfs_SetError(0);
2022 if(dsc->nextReturn){
2023 dsc->de.d_ino = yaffs_GetEquivalentObject(dsc->nextReturn)->objectId;
2024 dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
2025 dsc->de.d_off = dsc->offset++;
2026 yaffs_GetObjectName(dsc->nextReturn,dsc->de.d_name,NAME_MAX);
2027 if(yaffs_strnlen(dsc->de.d_name,NAME_MAX+1) == 0)
2029 /* this should not happen! */
2030 yaffs_strcpy(dsc->de.d_name,_Y("zz"));
2032 dsc->de.d_reclen = sizeof(struct yaffs_dirent);
2034 yaffsfs_DirAdvance(dsc);
2038 yaffsfs_SetError(-EBADF);
2047 void yaffs_rewinddir(yaffs_DIR *dirp)
2049 yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2053 yaffsfs_SetDirRewound(dsc);
2059 int yaffs_closedir(yaffs_DIR *dirp)
2061 yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2065 ylist_del(&dsc->others); /* unhook from list */
2071 /* End of directory stuff */
2074 int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath)
2076 yaffs_Object *parent = NULL;
2080 int mode = 0; /* ignore for now */
2083 parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
2084 if(parent && parent->myDev->readOnly)
2085 yaffsfs_SetError(-EINVAL);
2087 obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
2091 yaffsfs_SetError(-ENOSPC); /* just assume no space for now */
2095 yaffsfs_SetError(-EINVAL);
2105 int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz)
2107 yaffs_Object *obj = NULL;
2113 obj = yaffsfs_FindObject(NULL,path,0);
2116 yaffsfs_SetError(-ENOENT);
2118 } else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK) {
2119 yaffsfs_SetError(-EINVAL);
2122 YCHAR *alias = obj->variant.symLinkVariant.alias;
2123 memset(buf,0,bufsiz);
2124 yaffs_strncpy(buf,alias,bufsiz - 1);
2131 int yaffs_link(const YCHAR *oldpath, const YCHAR *newpath)
2133 /* Creates a link called newpath to existing oldpath */
2134 yaffs_Object *obj = NULL;
2135 yaffs_Object *target = NULL;
2137 int newNameLength = 0;
2142 obj = yaffsfs_FindObject(NULL,oldpath,0);
2143 target = yaffsfs_FindObject(NULL,newpath,0);
2146 yaffsfs_SetError(-ENOENT);
2148 } else if(obj->myDev->readOnly){
2149 yaffsfs_SetError(-EINVAL);
2152 yaffsfs_SetError(-EEXIST);
2155 yaffs_Object *newdir = NULL;
2156 yaffs_Object *link = NULL;
2160 newdir = yaffsfs_FindDirectory(NULL,newpath,&newname,0);
2163 yaffsfs_SetError(-ENOTDIR);
2165 }else if(newdir->myDev != obj->myDev){
2166 yaffsfs_SetError(-EXDEV);
2170 newNameLength = yaffs_strnlen(newname,YAFFS_MAX_NAME_LENGTH+1);
2172 if(newNameLength == 0){
2173 yaffsfs_SetError(-ENOENT);
2175 } else if (newNameLength > YAFFS_MAX_NAME_LENGTH){
2176 yaffsfs_SetError(-ENAMETOOLONG);
2181 link = yaffs_Link(newdir,newname,obj);
2185 yaffsfs_SetError(-ENOSPC);
2196 int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev)
2201 int yaffs_DumpDevStruct(const YCHAR *path)
2206 yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
2209 yaffs_Device *dev = obj->myDev;
2212 "nPageWrites.......... %d\n"
2213 "nPageReads........... %d\n"
2214 "nBlockErasures....... %d\n"
2215 "nGCCopies............ %d\n"
2216 "garbageCollections... %d\n"
2217 "passiveGarbageColl'ns %d\n"
2221 dev->nBlockErasures,
2223 dev->garbageCollections,
2224 dev->passiveGarbageCollections