2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2007 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.
19 #include "yaffs_guts.h"
25 #include <string.h> // for memset
28 #define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
31 #define NULL ((void *)0)
35 const char *yaffsfs_c_version="$Id: yaffsfs.c,v 1.18 2007/07/18 19:40:38 charles Exp $";
37 // configurationList is the list of devices that are supported
38 static yaffsfs_DeviceConfiguration *yaffsfs_configurationList;
41 /* Some forward references */
42 static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path, int symDepth);
43 static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj);
50 unsigned int yaffs_wr_attempts;
54 __u8 inUse:1; // this handle is in use
55 __u8 readOnly:1; // this handle is read only
56 __u8 append:1; // append only
57 __u8 exclusive:1; // exclusive
58 __u32 position; // current position in file
59 yaffs_Object *obj; // the object
63 static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
66 /// Inilitalise handles on start-up.
68 static int yaffsfs_InitHandles(void)
71 for(i = 0; i < YAFFSFS_N_HANDLES; i++)
73 yaffsfs_handle[i].inUse = 0;
74 yaffsfs_handle[i].obj = NULL;
79 yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
81 if(h < 0 || h >= YAFFSFS_N_HANDLES)
86 return &yaffsfs_handle[h];
89 yaffs_Object *yaffsfs_GetHandleObject(int handle)
91 yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
103 // Grab a handle (when opening a file)
106 static int yaffsfs_GetHandle(void)
111 for(i = 0; i < YAFFSFS_N_HANDLES; i++)
113 h = yaffsfs_GetHandlePointer(i);
116 // todo bug: should never happen
120 memset(h,0,sizeof(yaffsfs_Handle));
129 // Let go of a handle (when closing a file)
131 static int yaffsfs_PutHandle(int handle)
133 yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
145 // Stuff to search for a directory from a path
148 int yaffsfs_Match(char a, char b)
154 // yaffsfs_FindDevice
156 // Scan the configuration list to find the root.
157 // Curveballs: Should match paths that end in '/' too
158 // Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
159 static yaffs_Device *yaffsfs_FindDevice(const char *path, char **restOfPath)
161 yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList;
162 const char *leftOver;
164 yaffs_Device *retval = NULL;
166 int longestMatch = -1;
168 // Check all configs, choose the one that:
169 // 1) Actually matches a prefix (ie /a amd /abc will not match
170 // 2) Matches the longest.
171 while(cfg && cfg->prefix && cfg->dev)
177 while(*p && //unmatched part of prefix
178 strcmp(p,"/") && // the rest of the prefix is not / (to catch / at end)
180 yaffsfs_Match(*p,*leftOver))
186 if((!*p || strcmp(p,"/") == 0) && // end of prefix
187 (!*leftOver || *leftOver == '/') && // no more in this path name part
188 (thisMatchLength > longestMatch))
191 *restOfPath = (char *)leftOver;
193 longestMatch = thisMatchLength;
200 static yaffs_Object *yaffsfs_FindRoot(const char *path, char **restOfPath)
205 dev= yaffsfs_FindDevice(path,restOfPath);
206 if(dev && dev->isMounted)
213 static yaffs_Object *yaffsfs_FollowLink(yaffs_Object *obj,int symDepth)
216 while(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
218 char *alias = obj->variant.symLinkVariant.alias;
222 // Starts with a /, need to scan from root up
223 obj = yaffsfs_FindObject(NULL,alias,symDepth++);
227 // Relative to here, so use the parent of the symlink as a start
228 obj = yaffsfs_FindObject(obj->parent,alias,symDepth++);
235 // yaffsfs_FindDirectory
236 // Parse a path to determine the directory and the name within the directory.
238 // eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
239 static yaffs_Object *yaffsfs_DoFindDirectory(yaffs_Object *startDir,const char *path,char **name,int symDepth)
243 char str[YAFFS_MAX_NAME_LENGTH+1];
246 if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES)
254 restOfPath = (char *)path;
258 dir = yaffsfs_FindRoot(path,&restOfPath);
264 // curve ball: also throw away surplus '/'
265 // eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
266 while(*restOfPath == '/')
268 restOfPath++; // get rid of '/'
274 while(*restOfPath && *restOfPath != '/')
276 if (i < YAFFS_MAX_NAME_LENGTH)
278 str[i] = *restOfPath;
287 // got to the end of the string
292 if(strcmp(str,".") == 0)
296 else if(strcmp(str,"..") == 0)
302 dir = yaffs_FindObjectByName(dir,str);
304 while(dir && dir->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
307 dir = yaffsfs_FollowLink(dir,symDepth);
311 if(dir && dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
318 // directory did not exist.
322 static yaffs_Object *yaffsfs_FindDirectory(yaffs_Object *relativeDirectory,const char *path,char **name,int symDepth)
324 return yaffsfs_DoFindDirectory(relativeDirectory,path,name,symDepth);
327 // yaffsfs_FindObject turns a path for an existing object into the object
329 static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path,int symDepth)
334 dir = yaffsfs_FindDirectory(relativeDirectory,path,&name,symDepth);
338 return yaffs_FindObjectByName(dir,name);
346 int yaffs_open(const char *path, int oflag, int mode)
348 yaffs_Object *obj = NULL;
349 yaffs_Object *dir = NULL;
352 yaffsfs_Handle *h = NULL;
354 int alreadyExclusive = 0;
357 int errorReported = 0;
362 // todo sanity check oflag (eg. can't have O_TRUNC without WRONLY or RDWR
367 handle = yaffsfs_GetHandle();
372 h = yaffsfs_GetHandlePointer(handle);
375 // try to find the exisiting object
376 obj = yaffsfs_FindObject(NULL,path,0);
378 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
381 obj = yaffsfs_FollowLink(obj,symDepth++);
386 // Check if the object is already in use
387 alreadyOpen = alreadyExclusive = 0;
389 for(i = 0; i <= YAFFSFS_N_HANDLES; i++)
393 yaffsfs_handle[i].inUse &&
394 obj == yaffsfs_handle[i].obj)
397 if(yaffsfs_handle[i].exclusive)
399 alreadyExclusive = 1;
404 if(((oflag & O_EXCL) && alreadyOpen) || alreadyExclusive)
409 // Open should fail if O_CREAT and O_EXCL are specified
410 if((oflag & O_EXCL) && (oflag & O_CREAT))
413 yaffsfs_SetError(-EEXIST);
417 // Check file permissions
418 if( (oflag & (O_RDWR | O_WRONLY)) == 0 && // ie O_RDONLY
419 !(obj->yst_mode & S_IREAD))
424 if( (oflag & O_RDWR) &&
425 !(obj->yst_mode & S_IREAD))
430 if( (oflag & (O_RDWR | O_WRONLY)) &&
431 !(obj->yst_mode & S_IWRITE))
438 else if((oflag & O_CREAT))
440 // Let's see if we can create this file
441 dir = yaffsfs_FindDirectory(NULL,path,&name,0);
444 obj = yaffs_MknodFile(dir,name,mode,0,0);
448 yaffsfs_SetError(-ENOTDIR);
452 if(obj && !openDenied)
456 h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1;
457 h->append = (oflag & O_APPEND) ? 1 : 0;
458 h->exclusive = (oflag & O_EXCL) ? 1 : 0;
462 if((oflag & O_TRUNC) && !h->readOnly)
465 yaffs_ResizeFile(obj,0);
471 yaffsfs_PutHandle(handle);
474 yaffsfs_SetError(-EACCESS);
487 int yaffs_close(int fd)
489 yaffsfs_Handle *h = NULL;
494 h = yaffsfs_GetHandlePointer(fd);
499 yaffs_FlushFile(h->obj,1);
501 if(h->obj->inUse <= 0 && h->obj->unlinked)
503 yaffs_DeleteFile(h->obj);
505 yaffsfs_PutHandle(fd);
511 yaffsfs_SetError(-EBADF);
520 int yaffs_read(int fd, void *buf, unsigned int nbyte)
522 yaffsfs_Handle *h = NULL;
523 yaffs_Object *obj = NULL;
529 h = yaffsfs_GetHandlePointer(fd);
530 obj = yaffsfs_GetHandleObject(fd);
535 yaffsfs_SetError(-EBADF);
540 if(yaffs_GetObjectFileLength(obj) > pos)
542 maxRead = yaffs_GetObjectFileLength(obj) - pos;
557 nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte);
560 h->position = pos + nRead;
577 return (nRead >= 0) ? nRead : -1;
581 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
583 yaffsfs_Handle *h = NULL;
584 yaffs_Object *obj = NULL;
587 int writeThrough = 0;
590 h = yaffsfs_GetHandlePointer(fd);
591 obj = yaffsfs_GetHandleObject(fd);
596 yaffsfs_SetError(-EBADF);
598 else if( h && obj && h->readOnly)
606 pos = yaffs_GetObjectFileLength(obj);
613 nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte,writeThrough);
617 h->position = pos + nWritten;
629 return (nWritten >= 0) ? nWritten : -1;
633 int yaffs_truncate(int fd, off_t newSize)
635 yaffsfs_Handle *h = NULL;
636 yaffs_Object *obj = NULL;
640 h = yaffsfs_GetHandlePointer(fd);
641 obj = yaffsfs_GetHandleObject(fd);
646 yaffsfs_SetError(-EBADF);
651 result = yaffs_ResizeFile(obj,newSize);
656 return (result) ? 0 : -1;
660 off_t yaffs_lseek(int fd, off_t offset, int whence)
662 yaffsfs_Handle *h = NULL;
663 yaffs_Object *obj = NULL;
668 h = yaffsfs_GetHandlePointer(fd);
669 obj = yaffsfs_GetHandleObject(fd);
674 yaffsfs_SetError(-EBADF);
676 else if(whence == SEEK_SET)
683 else if(whence == SEEK_CUR)
685 if( (h->position + offset) >= 0)
687 pos = (h->position + offset);
690 else if(whence == SEEK_END)
692 fSize = yaffs_GetObjectFileLength(obj);
693 if(fSize >= 0 && (fSize + offset) >= 0)
695 pos = fSize + offset;
715 int yaffsfs_DoUnlink(const char *path,int isDirectory)
717 yaffs_Object *dir = NULL;
718 yaffs_Object *obj = NULL;
720 int result = YAFFS_FAIL;
724 obj = yaffsfs_FindObject(NULL,path,0);
725 dir = yaffsfs_FindDirectory(NULL,path,&name,0);
728 yaffsfs_SetError(-ENOTDIR);
732 yaffsfs_SetError(-ENOENT);
734 else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
736 yaffsfs_SetError(-EISDIR);
738 else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
740 yaffsfs_SetError(-ENOTDIR);
744 result = yaffs_Unlink(dir,name);
746 if(result == YAFFS_FAIL && isDirectory)
748 yaffsfs_SetError(-ENOTEMPTY);
756 return (result == YAFFS_FAIL) ? -1 : 0;
758 int yaffs_rmdir(const char *path)
760 return yaffsfs_DoUnlink(path,1);
763 int yaffs_unlink(const char *path)
765 return yaffsfs_DoUnlink(path,0);
768 int yaffs_rename(const char *oldPath, const char *newPath)
770 yaffs_Object *olddir = NULL;
771 yaffs_Object *newdir = NULL;
772 yaffs_Object *obj = NULL;
775 int result= YAFFS_FAIL;
776 int renameAllowed = 1;
780 olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
781 newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
782 obj = yaffsfs_FindObject(NULL,oldPath,0);
784 if(!olddir || !newdir || !obj)
787 yaffsfs_SetError(-EBADF);
790 else if(olddir->myDev != newdir->myDev)
792 // oops must be on same device
794 yaffsfs_SetError(-EXDEV);
797 else if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
799 // It is a directory, check that it is not being renamed to
800 // being its own decendent.
801 // Do this by tracing from the new directory back to the root, checking for obj
803 yaffs_Object *xx = newdir;
805 while( renameAllowed && xx)
813 if(!renameAllowed) yaffsfs_SetError(-EACCESS);
818 result = yaffs_RenameObject(olddir,oldname,newdir,newname);
823 return (result == YAFFS_FAIL) ? -1 : 0;
827 static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
833 obj = yaffs_GetEquivalentObject(obj);
838 buf->st_dev = (int)obj->myDev->genericDevice;
839 buf->st_ino = obj->objectId;
840 buf->st_mode = obj->yst_mode & ~S_IFMT; // clear out file type bits
842 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
844 buf->st_mode |= S_IFDIR;
846 else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
848 buf->st_mode |= S_IFLNK;
850 else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
852 buf->st_mode |= S_IFREG;
855 buf->st_nlink = yaffs_GetObjectLinkCount(obj);
858 buf->st_rdev = obj->yst_rdev;
859 buf->st_size = yaffs_GetObjectFileLength(obj);
860 buf->st_blksize = obj->myDev->nDataBytesPerChunk;
861 buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
862 buf->yst_atime = obj->yst_atime;
863 buf->yst_ctime = obj->yst_ctime;
864 buf->yst_mtime = obj->yst_mtime;
870 static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int doLStat)
877 obj = yaffsfs_FindObject(NULL,path,0);
881 obj = yaffsfs_FollowLink(obj,0);
886 retVal = yaffsfs_DoStat(obj,buf);
890 // todo error not found
891 yaffsfs_SetError(-ENOENT);
900 int yaffs_stat(const char *path, struct yaffs_stat *buf)
902 return yaffsfs_DoStatOrLStat(path,buf,0);
905 int yaffs_lstat(const char *path, struct yaffs_stat *buf)
907 return yaffsfs_DoStatOrLStat(path,buf,1);
910 int yaffs_fstat(int fd, struct yaffs_stat *buf)
917 obj = yaffsfs_GetHandleObject(fd);
921 retVal = yaffsfs_DoStat(obj,buf);
926 yaffsfs_SetError(-EBADF);
934 static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
936 int result = YAFFS_FAIL;
940 obj = yaffs_GetEquivalentObject(obj);
945 obj->yst_mode = mode;
947 result = yaffs_FlushFile(obj,0);
950 return result == YAFFS_OK ? 0 : -1;
954 int yaffs_chmod(const char *path, mode_t mode)
961 obj = yaffsfs_FindObject(NULL,path,0);
965 retVal = yaffsfs_DoChMod(obj,mode);
969 // todo error not found
970 yaffsfs_SetError(-ENOENT);
980 int yaffs_fchmod(int fd, mode_t mode)
987 obj = yaffsfs_GetHandleObject(fd);
991 retVal = yaffsfs_DoChMod(obj,mode);
996 yaffsfs_SetError(-EBADF);
1005 int yaffs_mkdir(const char *path, mode_t mode)
1007 yaffs_Object *parent = NULL;
1008 yaffs_Object *dir = NULL;
1013 parent = yaffsfs_FindDirectory(NULL,path,&name,0);
1015 dir = yaffs_MknodDirectory(parent,name,mode,0,0);
1022 yaffsfs_SetError(-ENOSPC); // just assume no space for now
1031 int yaffs_mount(const char *path)
1034 int result=YAFFS_FAIL;
1035 yaffs_Device *dev=NULL;
1038 T(YAFFS_TRACE_ALWAYS,("yaffs: Mounting %s\n",path));
1041 dev = yaffsfs_FindDevice(path,&dummy);
1046 result = yaffs_GutsInitialise(dev);
1047 if(result == YAFFS_FAIL)
1049 // todo error - mount failed
1050 yaffsfs_SetError(-ENOMEM);
1052 retVal = result ? 0 : -1;
1057 //todo error - already mounted.
1058 yaffsfs_SetError(-EBUSY);
1063 // todo error - no device
1064 yaffsfs_SetError(-ENODEV);
1071 int yaffs_unmount(const char *path)
1074 yaffs_Device *dev=NULL;
1078 dev = yaffsfs_FindDevice(path,&dummy);
1086 yaffs_FlushEntireDeviceCache(dev);
1087 yaffs_CheckpointSave(dev);
1089 for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++)
1091 if(yaffsfs_handle[i].inUse && yaffsfs_handle[i].obj->myDev == dev)
1093 inUse = 1; // the device is in use, can't unmount
1099 yaffs_Deinitialise(dev);
1105 // todo error can't unmount as files are open
1106 yaffsfs_SetError(-EBUSY);
1112 //todo error - not mounted.
1113 yaffsfs_SetError(-EINVAL);
1119 // todo error - no device
1120 yaffsfs_SetError(-ENODEV);
1127 loff_t yaffs_freespace(const char *path)
1130 yaffs_Device *dev=NULL;
1134 dev = yaffsfs_FindDevice(path,&dummy);
1135 if(dev && dev->isMounted)
1137 retVal = yaffs_GetNumberOfFreeChunks(dev);
1138 retVal *= dev->nDataBytesPerChunk;
1143 yaffsfs_SetError(-EINVAL);
1152 void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList)
1155 yaffsfs_DeviceConfiguration *cfg;
1157 yaffsfs_configurationList = cfgList;
1159 yaffsfs_InitHandles();
1161 cfg = yaffsfs_configurationList;
1163 while(cfg && cfg->prefix && cfg->dev)
1165 cfg->dev->isMounted = 0;
1166 cfg->dev->removeObjectCallback = yaffsfs_RemoveObjectCallback;
1173 // Directory search stuff.
1176 // Directory search context
1178 // NB this is an opaque structure.
1184 yaffs_dirent de; /* directory entry being used by this dsc */
1185 char name[NAME_MAX+1]; /* name of directory being searched */
1186 yaffs_Object *dirObj; /* ptr to directory being searched */
1187 yaffs_Object *nextReturn; /* obj to be returned by next readddir */
1189 struct list_head others;
1190 } yaffsfs_DirectorySearchContext;
1194 static struct list_head search_contexts;
1197 static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
1201 dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
1205 if( list_empty(&dsc->dirObj->variant.directoryVariant.children)){
1206 dsc->nextReturn = NULL;
1208 dsc->nextReturn = list_entry(dsc->dirObj->variant.directoryVariant.children.next,
1209 yaffs_Object,siblings);
1212 /* Hey someone isn't playing nice! */
1216 static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
1220 dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
1222 if( dsc->nextReturn == NULL ||
1223 list_empty(&dsc->dirObj->variant.directoryVariant.children)){
1224 dsc->nextReturn = NULL;
1226 struct list_head *next = dsc->nextReturn->siblings.next;
1228 if( next == &dsc->dirObj->variant.directoryVariant.children)
1229 dsc->nextReturn = NULL; /* end of list */
1231 dsc->nextReturn = list_entry(next,yaffs_Object,siblings);
1234 /* Hey someone isn't playing nice! */
1238 static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj)
1241 struct list_head *i;
1242 yaffsfs_DirectorySearchContext *dsc;
1244 /* if search contexts not initilised then skip */
1245 if(!search_contexts.next)
1248 /* Iteratethrough the directory search contexts.
1249 * If any are the one being removed, then advance the dsc to
1250 * the next one to prevent a hanging ptr.
1252 list_for_each(i, &search_contexts) {
1254 dsc = list_entry(i, yaffsfs_DirectorySearchContext,others);
1255 if(dsc->nextReturn == obj)
1256 yaffsfs_DirAdvance(dsc);
1262 yaffs_DIR *yaffs_opendir(const char *dirname)
1264 yaffs_DIR *dir = NULL;
1265 yaffs_Object *obj = NULL;
1266 yaffsfs_DirectorySearchContext *dsc = NULL;
1270 obj = yaffsfs_FindObject(NULL,dirname,0);
1272 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1275 dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
1276 dir = (yaffs_DIR *)dsc;
1279 memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
1280 dsc->magic = YAFFS_MAGIC;
1282 strncpy(dsc->name,dirname,NAME_MAX);
1283 INIT_LIST_HEAD(&dsc->others);
1285 if(!search_contexts.next)
1286 INIT_LIST_HEAD(&search_contexts);
1288 list_add(&dsc->others,&search_contexts);
1289 yaffsfs_SetDirRewound(dsc); }
1298 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
1300 yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1301 struct yaffs_dirent *retVal = NULL;
1305 if(dsc && dsc->magic == YAFFS_MAGIC){
1306 yaffsfs_SetError(0);
1307 if(dsc->nextReturn){
1308 dsc->de.d_ino = yaffs_GetEquivalentObject(dsc->nextReturn)->objectId;
1309 dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
1310 dsc->de.d_off = dsc->offset++;
1311 yaffs_GetObjectName(dsc->nextReturn,dsc->de.d_name,NAME_MAX);
1312 if(strlen(dsc->de.d_name) == 0)
1314 // this should not happen!
1315 strcpy(dsc->de.d_name,"zz");
1317 dsc->de.d_reclen = sizeof(struct yaffs_dirent);
1319 yaffsfs_DirAdvance(dsc);
1325 yaffsfs_SetError(-EBADF);
1335 void yaffs_rewinddir(yaffs_DIR *dirp)
1337 yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1341 yaffsfs_SetDirRewound(dsc);
1347 int yaffs_closedir(yaffs_DIR *dirp)
1349 yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1353 list_del(&dsc->others); /* unhook from list */
1359 // end of directory stuff
1362 int yaffs_symlink(const char *oldpath, const char *newpath)
1364 yaffs_Object *parent = NULL;
1368 int mode = 0; // ignore for now
1371 parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
1372 obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
1379 yaffsfs_SetError(-ENOSPC); // just assume no space for now
1389 int yaffs_readlink(const char *path, char *buf, int bufsiz)
1391 yaffs_Object *obj = NULL;
1397 obj = yaffsfs_FindObject(NULL,path,0);
1401 yaffsfs_SetError(-ENOENT);
1404 else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK)
1406 yaffsfs_SetError(-EINVAL);
1411 char *alias = obj->variant.symLinkVariant.alias;
1412 memset(buf,0,bufsiz);
1413 strncpy(buf,alias,bufsiz - 1);
1420 int yaffs_link(const char *oldpath, const char *newpath)
1422 // Creates a link called newpath to existing oldpath
1423 yaffs_Object *obj = NULL;
1424 yaffs_Object *target = NULL;
1430 obj = yaffsfs_FindObject(NULL,oldpath,0);
1431 target = yaffsfs_FindObject(NULL,newpath,0);
1435 yaffsfs_SetError(-ENOENT);
1440 yaffsfs_SetError(-EEXIST);
1445 yaffs_Object *newdir = NULL;
1446 yaffs_Object *link = NULL;
1450 newdir = yaffsfs_FindDirectory(NULL,newpath,&newname,0);
1454 yaffsfs_SetError(-ENOTDIR);
1457 else if(newdir->myDev != obj->myDev)
1459 yaffsfs_SetError(-EXDEV);
1462 if(newdir && strlen(newname) > 0)
1464 link = yaffs_Link(newdir,newname,obj);
1469 yaffsfs_SetError(-ENOSPC);
1480 int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
1482 int yaffs_DumpDevStruct(const char *path)
1486 yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
1490 yaffs_Device *dev = obj->myDev;
1493 "nPageWrites.......... %d\n"
1494 "nPageReads........... %d\n"
1495 "nBlockErasures....... %d\n"
1496 "nGCCopies............ %d\n"
1497 "garbageCollections... %d\n"
1498 "passiveGarbageColl'ns %d\n"
1502 dev->nBlockErasures,
1504 dev->garbageCollections,
1505 dev->passiveGarbageCollections