direct/yaffsfs.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2010 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  *
   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.
  12  */
  13
  14 #include "yaffsfs.h"
  15 #include "yaffs_guts.h"
  16 #include "yaffscfg.h"
  17 #include "yportenv.h"
  18 #include "yaffs_trace.h"
  19
  20 #include <string.h> /* for memset */
  21
  22 #define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
  23
  24 #ifndef NULL
  25 #define NULL ((void *)0)
  26 #endif
  27
  28
  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)
  32
  33 /* Some forward references */
  34 static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relativeDirectory,
  35                         const YCHAR *path,
  36                         int symDepth, int getEquiv,
  37                         struct yaffs_obj **dirOut,
  38                         int *notDir, int *loop);
  39
  40 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj);
  41
  42 unsigned int yaffs_wr_attempts;
  43
  44 /*
  45  * Handle management.
  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.
  49  *
  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.
  54  *
  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.
  60  *
  61  * More than one fd can currently access one file, but each fd
  62  * has its own permsiions and offset.
  63  */
  64
  65 typedef struct {
  66         int count;      /* Number of handles accessing this inode */
  67         struct yaffs_obj *iObj;
  68 } yaffsfs_Inode;
  69
  70 typedef struct{
  71         u8      reading:1;
  72         u8      writing:1;
  73         u8      append:1;
  74         u8      shareRead:1;
  75         u8      shareWrite:1;
  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 */
  79 }yaffsfs_FileDes;
  80
  81 typedef struct {
  82         short int fdId;
  83         short int useCount;
  84 } yaffsfs_Handle;
  85
  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];
  89
  90 static int yaffsfs_handlesInitialised;
  91
  92
  93 unsigned yaffs_set_trace(unsigned  tm)
  94 {
  95         yaffs_trace_mask = tm;
  96         return yaffs_trace_mask;
  97 }
  98
  99 unsigned yaffs_get_trace(void)
 100 {
 101         return yaffs_trace_mask;
 102 }
 103
 104 /*
 105  * yaffsfs_InitHandle
 106  * Inilitalise handle management on start-up.
 107  */
 108
 109 static void yaffsfs_InitHandles(void)
 110 {
 111         int i;
 112         if(yaffsfs_handlesInitialised)
 113                 return;
 114
 115         memset(yaffsfs_inode,0,sizeof(yaffsfs_inode));
 116         memset(yaffsfs_fd,0,sizeof(yaffsfs_fd));
 117         memset(yaffsfs_handle,0,sizeof(yaffsfs_handle));
 118
 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;
 123 }
 124
 125 static yaffsfs_Handle *yaffsfs_HandleToPointer(int h)
 126 {
 127         if(h >= 0 && h <= YAFFSFS_N_HANDLES)
 128                 return &yaffsfs_handle[h];
 129         return NULL;
 130 }
 131
 132 static yaffsfs_FileDes *yaffsfs_HandleToFileDes(int handle)
 133 {
 134         yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
 135
 136         if(h && h->useCount > 0 && h->fdId >= 0 && h->fdId < YAFFSFS_N_HANDLES)
 137                 return  &yaffsfs_fd[h->fdId];
 138
 139         return NULL;
 140 }
 141
 142 static yaffsfs_Inode *yaffsfs_HandleToInode(int handle)
 143 {
 144         yaffsfs_FileDes *fd = yaffsfs_HandleToFileDes(handle);
 145
 146         if(fd && fd->handleCount > 0 &&
 147                 fd->inodeId >= 0 && fd->inodeId < YAFFSFS_N_HANDLES)
 148                 return  &yaffsfs_inode[fd->inodeId];
 149
 150         return NULL;
 151 }
 152
 153 static struct yaffs_obj *yaffsfs_HandleToObject(int handle)
 154 {
 155         yaffsfs_Inode *in = yaffsfs_HandleToInode(handle);
 156
 157         if(in)
 158                 return in->iObj;
 159
 160         return NULL;
 161 }
 162
 163 /*
 164  * yaffsfs_FindInodeIdForObject
 165  * Find the inode entry for an object, if it exists.
 166  */
 167
 168 static int yaffsfs_FindInodeIdForObject(struct yaffs_obj *obj)
 169 {
 170         int i;
 171         int ret = -1;
 172
 173         if(obj)
 174                 obj = yaffs_get_equivalent_obj(obj);
 175
 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)
 179                         ret = i;
 180         }
 181         return ret;
 182 }
 183
 184 /*
 185  * yaffsfs_GetInodeIdForObject
 186  * Grab an inode entry when opening a new inode.
 187  */
 188 static int yaffsfs_GetInodeIdForObject(struct yaffs_obj *obj)
 189 {
 190         int i;
 191         int ret;
 192         yaffsfs_Inode *in = NULL;
 193
 194         if(obj)
 195                 obj = yaffs_get_equivalent_obj(obj);
 196
 197         ret = yaffsfs_FindInodeIdForObject(obj);
 198
 199         for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
 200                 if(!yaffsfs_inode[i].iObj)
 201                         ret = i;
 202         }
 203
 204         if(ret>=0){
 205                 in = &yaffsfs_inode[ret];
 206                 if(!in->iObj)
 207                         in->count = 0;
 208                 in->iObj = obj;
 209                 in->count++;
 210         }
 211
 212
 213         return ret;
 214 }
 215
 216
 217 static int yaffsfs_CountHandles(struct yaffs_obj *obj)
 218 {
 219         int i = yaffsfs_FindInodeIdForObject(obj);
 220
 221         if(i >= 0)
 222                 return yaffsfs_inode[i].count;
 223         else
 224                 return 0;
 225 }
 226
 227 static void yaffsfs_ReleaseInode(yaffsfs_Inode *in)
 228 {
 229         struct yaffs_obj *obj;
 230
 231         obj = in->iObj;
 232
 233         if(obj->unlinked)
 234                 yaffs_del_obj(obj);
 235
 236         obj->my_inode = NULL;
 237         in->iObj = NULL;
 238
 239 }
 240
 241 static void yaffsfs_PutInode(int inodeId)
 242 {
 243         if(inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES){
 244                 yaffsfs_Inode *in = & yaffsfs_inode[inodeId];
 245                 in->count--;
 246                 if(in->count <= 0){
 247                         yaffsfs_ReleaseInode(in);
 248                         in->count = 0;
 249                 }
 250         }
 251 }
 252
 253
 254
 255 static int yaffsfs_NewHandle(yaffsfs_Handle **hptr)
 256 {
 257         int i;
 258         yaffsfs_Handle *h;
 259
 260         for(i = 0; i < YAFFSFS_N_HANDLES; i++){
 261                 h = &yaffsfs_handle[i];
 262                 if(h->useCount < 1){
 263                         memset(h,0,sizeof(yaffsfs_Handle));
 264                         h->fdId=-1;
 265                         h->useCount=1;
 266                         if(hptr)
 267                                 *hptr = h;
 268                         return i;
 269                 }
 270         }
 271         return -1;
 272 }
 273
 274 static int yaffsfs_NewHandleAndFileDes(void)
 275 {
 276         int i;
 277         yaffsfs_FileDes *fd;
 278         yaffsfs_Handle  *h = NULL;
 279         int handle = yaffsfs_NewHandle(&h);
 280
 281         if(handle < 0)
 282                 return -1;
 283
 284         for(i = 0; i < YAFFSFS_N_HANDLES; i++){
 285                 fd = &yaffsfs_fd[i];
 286                 if(fd->handleCount < 1){
 287                         memset(fd,0,sizeof(yaffsfs_FileDes));
 288                         fd->inodeId=-1;
 289                         fd->handleCount=1;
 290                         h->fdId = i;
 291                         return handle;
 292                 }
 293         }
 294
 295         /* Dump the handle because we could not get a fd */
 296         h->useCount = 0;
 297         return -1;
 298 }
 299
 300 /*
 301  * yaffs_get_handle
 302  * Increase use of handle when reading/writing a file
 303  * Also gets the file descriptor.
 304  */
 305
 306 static int yaffsfs_GetHandle(int handle)
 307 {
 308         yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
 309
 310         if(h && h->useCount > 0){
 311                 h->useCount++;
 312                 return 0;
 313         }
 314         return -1;
 315 }
 316
 317 /*
 318  * yaffs_put_handle
 319  * Let go of a handle when closing a file or aborting an open or
 320  * ending a read or write.
 321  */
 322
 323 static int yaffsfs_PutFileDes(int fdId)
 324 {
 325         yaffsfs_FileDes *fd;
 326
 327         if(fdId >= 0 && fdId < YAFFSFS_N_HANDLES){
 328                 fd = &yaffsfs_fd[fdId];
 329                 fd->handleCount--;
 330                 if(fd->handleCount < 1){
 331                         if(fd->inodeId >= 0){
 332                                 yaffsfs_PutInode(fd->inodeId);
 333                                 fd->inodeId = -1;
 334                         }
 335                 }
 336         }
 337         return 0;
 338 }
 339 static int yaffsfs_PutHandle(int handle)
 340 {
 341         yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
 342
 343         if(h && h->useCount > 0){
 344                 h->useCount--;
 345                 if(h->useCount < 1){
 346                         yaffsfs_PutFileDes(h->fdId);
 347                         h->fdId = -1;
 348                 }
 349         }
 350
 351         return 0;
 352 }
 353
 354 static void yaffsfs_BreakDeviceHandles(struct yaffs_dev *dev)
 355 {
 356         yaffsfs_FileDes *fd;
 357         yaffsfs_Handle *h;
 358         struct yaffs_obj *obj;
 359         int i;
 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){
 365                         h->useCount = 0;
 366                         h->fdId = 0;
 367                 }
 368                 if(fd && fd->handleCount>0 && obj && obj->my_dev == dev){
 369
 370                         fd->handleCount = 0;
 371                         yaffsfs_PutInode(fd->inodeId);
 372                         fd->inodeId = -1;
 373                 }
 374         }
 375 }
 376
 377
 378
 379
 380 /*
 381  *  Stuff to handle names.
 382  */
 383
 384
 385 int yaffsfs_Match(YCHAR a, YCHAR b)
 386 {
 387         /* case sensitive */
 388         return (a == b);
 389 }
 390
 391 int yaffsfs_IsPathDivider(YCHAR ch)
 392 {
 393         const YCHAR *str = YAFFS_PATH_DIVIDERS;
 394
 395         while(*str){
 396                 if(*str == ch)
 397                         return 1;
 398                 str++;
 399         }
 400
 401         return 0;
 402 }
 403
 404 int yaffsfs_CheckNameLength(const char *name)
 405 {
 406         int retVal = 0;
 407
 408         int nameLength = strnlen(name,YAFFS_MAX_NAME_LENGTH+1);
 409
 410         if(nameLength == 0){
 411                 yaffsfs_SetError(-ENOENT);
 412                 retVal = -1;
 413         } else if (nameLength > YAFFS_MAX_NAME_LENGTH){
 414                 yaffsfs_SetError(-ENAMETOOLONG);
 415                 retVal = -1;
 416         }
 417
 418         return retVal;
 419 }
 420
 421
 422 static int yaffsfs_alt_dir_path(const YCHAR *path, YCHAR **ret_path)
 423 {
 424         YCHAR *alt_path = NULL;
 425         int path_length;
 426         int i;
 427
 428         /*
 429          * We don't have a definition for max path length.
 430          * We will use 3 * max name length instead.
 431          */
 432         *ret_path = NULL;
 433         path_length = strnlen(path,(YAFFS_MAX_NAME_LENGTH+1)*3 +1);
 434
 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
 440          */
 441         if(path_length > 0 &&
 442                 yaffsfs_IsPathDivider(path[path_length-1])){
 443                 alt_path = kmalloc(path_length + 1, 0);
 444                 if(!alt_path)
 445                         return -1;
 446                 strcpy(alt_path, path);
 447                 for(i = path_length-1;
 448                         i >= 0 && yaffsfs_IsPathDivider(alt_path[i]);
 449                         i--)
 450                         alt_path[i] = (YCHAR) 0;
 451         }
 452         *ret_path = alt_path;
 453         return 0;
 454 }
 455
 456
 457 LIST_HEAD(yaffsfs_deviceList);
 458
 459 /*
 460  * yaffsfs_FindDevice
 461  * yaffsfs_FindRoot
 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
 465  */
 466 static struct yaffs_dev *yaffsfs_FindDevice(const YCHAR *path, YCHAR **restOfPath)
 467 {
 468         struct list_head *cfg;
 469         const YCHAR *leftOver;
 470         const YCHAR *p;
 471         struct yaffs_dev *retval = NULL;
 472         struct yaffs_dev *dev = NULL;
 473         int thisMatchLength;
 474         int longestMatch = -1;
 475         int matching;
 476
 477         /*
 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.
 481          */
 482         list_for_each(cfg, &yaffsfs_deviceList){
 483                 dev = list_entry(cfg, struct yaffs_dev, dev_list);
 484                 leftOver = path;
 485                 p = dev->param.name;
 486                 thisMatchLength = 0;
 487                 matching = 1;
 488
 489
 490                 while(matching && *p && *leftOver){
 491                         /* Skip over any /s */
 492                         while(yaffsfs_IsPathDivider(*p))
 493                               p++;
 494
 495                         /* Skip over any /s */
 496                         while(yaffsfs_IsPathDivider(*leftOver))
 497                               leftOver++;
 498
 499                         /* Now match the text part */
 500                         while(matching &&
 501                               *p && !yaffsfs_IsPathDivider(*p) &&
 502                               *leftOver && !yaffsfs_IsPathDivider(*leftOver)){
 503                                 if(yaffsfs_Match(*p,*leftOver)){
 504                                         p++;
 505                                         leftOver++;
 506                                         thisMatchLength++;
 507                                 } else {
 508                                         matching = 0;
 509                                 }
 510                         }
 511                 }
 512
 513                 /* Skip over any /s in leftOver */
 514                 while(yaffsfs_IsPathDivider(*leftOver))
 515                       leftOver++;
 516
 517                 // Skip over any /s in p
 518                 while(yaffsfs_IsPathDivider(*p))
 519                       p++;
 520
 521                 // p should now be at the end of the string (ie. fully matched)
 522                 if(*p)
 523                         matching = 0;
 524
 525                 if( matching && (thisMatchLength > longestMatch))
 526                 {
 527                         // Matched prefix
 528                         *restOfPath = (YCHAR *)leftOver;
 529                         retval = dev;
 530                         longestMatch = thisMatchLength;
 531                 }
 532
 533         }
 534         return retval;
 535 }
 536
 537 static int yaffsfs_CheckPath(const YCHAR *path)
 538 {
 539         int n=0;
 540         int divs=0;
 541         while(*path && n < YAFFS_MAX_NAME_LENGTH && divs < 100){
 542                 if(yaffsfs_IsPathDivider(*path)){
 543                         n=0;
 544                         divs++;
 545                 } else
 546                         n++;
 547                 path++;
 548         }
 549
 550         return (*path) ? -1 : 0;
 551 }
 552
 553 /* FindMountPoint only returns a dev entry if the path is a mount point */
 554 static struct yaffs_dev *yaffsfs_FindMountPoint(const YCHAR *path)
 555 {
 556         struct yaffs_dev *dev;
 557         YCHAR *restOfPath=NULL;
 558         dev = yaffsfs_FindDevice(path,&restOfPath);
 559         if(dev && restOfPath && *restOfPath)
 560                 dev = NULL;
 561         return dev;
 562 }
 563
 564 static struct yaffs_obj *yaffsfs_FindRoot(const YCHAR *path, YCHAR **restOfPath)
 565 {
 566
 567         struct yaffs_dev *dev;
 568
 569         dev= yaffsfs_FindDevice(path,restOfPath);
 570         if(dev && dev->is_mounted){
 571                 return dev->root_dir;
 572         }
 573         return NULL;
 574 }
 575
 576 static struct yaffs_obj *yaffsfs_FollowLink(struct yaffs_obj *obj,
 577                                         int symDepth, int *loop)
 578 {
 579
 580         if(obj)
 581                 obj = yaffs_get_equivalent_obj(obj);
 582
 583         while(obj && obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK){
 584                 YCHAR *alias = obj->variant.symlink_variant.alias;
 585
 586                 if(yaffsfs_IsPathDivider(*alias))
 587                         /* Starts with a /, need to scan from root up */
 588                         obj = yaffsfs_FindObject(NULL,alias,symDepth++,
 589                                                 1,NULL,NULL,loop);
 590                 else
 591                         /* Relative to here, so use the parent of the symlink as a start */
 592                         obj = yaffsfs_FindObject(obj->parent,alias,symDepth++,
 593                                                 1,NULL,NULL,loop);
 594         }
 595         return obj;
 596 }
 597
 598
 599 /*
 600  * yaffsfs_FindDirectory
 601  * Parse a path to determine the directory and the name within the directory.
 602  *
 603  * eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
 604  */
 605 static struct yaffs_obj *yaffsfs_DoFindDirectory(struct yaffs_obj *startDir,
 606                                 const YCHAR *path, YCHAR **name, int symDepth,
 607                                 int *notDir,int *loop)
 608 {
 609         struct yaffs_obj *dir;
 610         YCHAR *restOfPath;
 611         YCHAR str[YAFFS_MAX_NAME_LENGTH+1];
 612         int i;
 613
 614         if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES){
 615                 if(loop)
 616                         *loop = 1;
 617                 return NULL;
 618         }
 619
 620         if(startDir){
 621                 dir = startDir;
 622                 restOfPath = (YCHAR *)path;
 623         }
 624         else
 625                 dir = yaffsfs_FindRoot(path,&restOfPath);
 626
 627
 628         while(dir){
 629                 /*
 630                  * parse off /.
 631                  * curve ball: also throw away surplus '/'
 632                  * eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
 633                  */
 634                 while(yaffsfs_IsPathDivider(*restOfPath))
 635                         restOfPath++; /* get rid of '/' */
 636
 637                 *name = restOfPath;
 638                 i = 0;
 639
 640                 while(*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)){
 641                         if (i < YAFFS_MAX_NAME_LENGTH){
 642                                 str[i] = *restOfPath;
 643                                 str[i+1] = '\0';
 644                                 i++;
 645                         }
 646                         restOfPath++;
 647                 }
 648
 649                 if(!*restOfPath)
 650                         /* got to the end of the string */
 651                         return dir;
 652                 else{
 653                         if(strcmp(str,_Y(".")) == 0){
 654                                 /* Do nothing */
 655                         } else if(strcmp(str,_Y("..")) == 0) {
 656                                 dir = dir->parent;
 657                         } else{
 658                                 dir = yaffs_find_by_name(dir,str);
 659
 660                                 dir = yaffsfs_FollowLink(dir,symDepth,loop);
 661
 662                                 if(dir && dir->variant_type !=
 663                                         YAFFS_OBJECT_TYPE_DIRECTORY){
 664                                         if(notDir)
 665                                                 *notDir = 1;
 666                                         dir = NULL;
 667                                 }
 668
 669                         }
 670                 }
 671         }
 672         /* directory did not exist. */
 673         return NULL;
 674 }
 675
 676 static struct yaffs_obj *yaffsfs_FindDirectory(struct yaffs_obj *relDir,
 677                                         const YCHAR *path,
 678                                         YCHAR **name,
 679                                         int symDepth,
 680                                         int *notDir,
 681                                         int *loop)
 682 {
 683         return yaffsfs_DoFindDirectory(relDir,path,name,symDepth,notDir,loop);
 684 }
 685
 686 /*
 687  * yaffsfs_FindObject turns a path for an existing object into the object
 688  */
 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)
 692 {
 693         struct yaffs_obj *dir;
 694         struct yaffs_obj *obj;
 695         YCHAR *name;
 696
 697         dir = yaffsfs_FindDirectory(relDir,path,&name,symDepth,notDir,loop);
 698
 699         if(dirOut)
 700                 *dirOut =  dir;
 701
 702         if(dir && *name)
 703                 obj = yaffs_find_by_name(dir,name);
 704         else
 705                 obj = dir;
 706
 707         if(getEquiv)
 708                 obj = yaffs_get_equivalent_obj(obj);
 709
 710         return obj;
 711 }
 712
 713
 714 /*************************************************************************
 715  *      Start of yaffsfs visible functions.
 716  *************************************************************************/
 717
 718 int yaffs_dup(int handle)
 719 {
 720         int newHandleNumber = -1;
 721         yaffsfs_FileDes *existingFD = NULL;
 722         yaffsfs_Handle *existingHandle = NULL;
 723         yaffsfs_Handle *newHandle = NULL;
 724
 725         yaffsfs_Lock();
 726         existingHandle = yaffsfs_HandleToPointer(handle);
 727         existingFD = yaffsfs_HandleToFileDes(handle);
 728         if(existingFD)
 729                 newHandleNumber = yaffsfs_NewHandle(&newHandle);
 730         if(newHandle){
 731                 newHandle->fdId = existingHandle->fdId;
 732                 existingFD->handleCount++;
 733         }
 734
 735         yaffsfs_Unlock();
 736
 737         if(!existingFD)
 738                 yaffsfs_SetError(-EBADF);
 739         else if (!newHandle)
 740                 yaffsfs_SetError(-ENOMEM);
 741
 742         return newHandleNumber;
 743
 744 }
 745
 746
 747
 748 int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int sharing)
 749 {
 750         struct yaffs_obj *obj = NULL;
 751         struct yaffs_obj *dir = NULL;
 752         YCHAR *name;
 753         int handle = -1;
 754         yaffsfs_FileDes *fd = NULL;
 755         int openDenied = 0;
 756         int symDepth = 0;
 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;
 763         u8 alreadyReading;
 764         u8 alreadyWriting;
 765         u8 readRequested;
 766         u8 writeRequested;
 767         int notDir = 0;
 768         int loop = 0;
 769
 770         if(!path) {
 771                 yaffsfs_SetError(-EFAULT);
 772                 return -1;
 773         }
 774
 775         if(yaffsfs_CheckPath(path) < 0){
 776                 yaffsfs_SetError(-ENAMETOOLONG);
 777                 return -1;
 778         }
 779
 780         /* O_EXCL only has meaning if O_CREAT is specified */
 781         if(!(oflag & O_CREAT))
 782                 oflag &= ~(O_EXCL);
 783
 784         /* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
 785         if( (oflag & O_CREAT) & (oflag & O_EXCL))
 786                 oflag &= ~(O_TRUNC);
 787
 788         /* Todo: Are there any more flag combos to sanitise ? */
 789
 790         /* Figure out if reading or writing is requested */
 791
 792         readRequested = (rwflags == O_RDWR || rwflags == O_RDONLY) ? 1 : 0;
 793         writeRequested = (rwflags == O_RDWR || rwflags == O_WRONLY) ? 1 : 0;
 794
 795         yaffsfs_Lock();
 796
 797         handle = yaffsfs_NewHandleAndFileDes();
 798
 799         if(handle < 0){
 800                 yaffsfs_SetError(-ENFILE);
 801                 errorReported = 1;
 802         } else {
 803
 804                 fd = yaffsfs_HandleToFileDes(handle);
 805
 806                 /* try to find the exisiting object */
 807                 obj = yaffsfs_FindObject(NULL,path,0,1,NULL,NULL,NULL);
 808
 809                 obj = yaffsfs_FollowLink(obj,symDepth++,&loop);
 810
 811                 if(obj &&
 812                         obj->variant_type != YAFFS_OBJECT_TYPE_FILE &&
 813                         obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
 814                         obj = NULL;
 815
 816
 817                 if(obj){
 818
 819                         /* The file already exists or it might be a directory */
 820
 821                         /* If it is a directory then we can't open it as a file */
 822                         if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
 823                                 openDenied = 1;
 824                                 yaffsfs_SetError(-EISDIR);
 825                                 errorReported = 1;
 826                         }
 827
 828                         /* Open should fail if O_CREAT and O_EXCL are specified since
 829                          * the file exists
 830                          */
 831                         if(!errorReported && (oflag & O_EXCL) && (oflag & O_CREAT)){
 832                                 openDenied = 1;
 833                                 yaffsfs_SetError(-EEXIST);
 834                                 errorReported = 1;
 835                         }
 836
 837                         /* Check file permissions */
 838                         if( readRequested && !(obj->yst_mode & S_IREAD))
 839                                 openDenied = 1;
 840
 841                         if( writeRequested && !(obj->yst_mode & S_IWRITE))
 842                                 openDenied = 1;
 843
 844                         if( !errorReported && writeRequested &&
 845                                 obj->my_dev->read_only){
 846                                 openDenied = 1;
 847                                 yaffsfs_SetError(-EROFS);
 848                                 errorReported = 1;
 849                         }
 850
 851                         if(openDenied && !errorReported ) {
 852                                 /* Error if the file exists but permissions are refused. */
 853                                 yaffsfs_SetError(-EACCES);
 854                                 errorReported = 1;
 855                         }
 856
 857                         /* Check sharing of an existing object. */
 858                         if(!openDenied){
 859                                 yaffsfs_FileDes *fdx;
 860                                 int i;
 861
 862                                 sharedReadAllowed = 1;
 863                                 sharedWriteAllowed = 1;
 864                                 alreadyReading = 0;
 865                                 alreadyWriting = 0;
 866                                 for( i = 0; i < YAFFSFS_N_HANDLES; i++){
 867                                         fdx = &yaffsfs_fd[i];
 868                                         if(fdx->handleCount > 0 &&
 869                                                 fdx->inodeId >= 0 &&
 870                                                 yaffsfs_inode[fdx->inodeId].iObj == obj){
 871                                                 if(!fdx->shareRead)
 872                                                         sharedReadAllowed = 0;
 873                                                 if(!fdx->shareWrite)
 874                                                         sharedWriteAllowed = 0;
 875                                                 if(fdx->reading)
 876                                                         alreadyReading = 1;
 877                                                 if(fdx->writing)
 878                                                         alreadyWriting = 1;
 879                                         }
 880                                 }
 881
 882
 883
 884                                 if((!sharedReadAllowed && readRequested)||
 885                                         (!shareRead  && alreadyReading) ||
 886                                         (!sharedWriteAllowed && writeRequested) ||
 887                                         (!shareWrite && alreadyWriting)){
 888                                         openDenied = 1;
 889                                         yaffsfs_SetError(-EBUSY);
 890                                         errorReported=1;
 891                                 }
 892                         }
 893
 894                 }
 895
 896                 /* If we could not open an existing object, then let's see if
 897                  * the directory exists. If not, error.
 898                  */
 899                 if(!obj && !errorReported){
 900                         dir = yaffsfs_FindDirectory(NULL,path,&name,0,&notDir,&loop);
 901                         if(!dir && notDir){
 902                                 yaffsfs_SetError(-ENOTDIR);
 903                                 errorReported = 1;
 904                         } else if(loop){
 905                                 yaffsfs_SetError(-ELOOP);
 906                                 errorReported = 1;
 907                         } else  if(!dir){
 908                                 yaffsfs_SetError(-ENOENT);
 909                                 errorReported = 1;
 910                         }
 911                 }
 912
 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);
 917                                 errorReported = 1;
 918                         } else
 919                                 obj = yaffs_create_file(dir,name,mode,0,0);
 920
 921                         if(!obj && !errorReported){
 922                                 yaffsfs_SetError(-ENOSPC);
 923                                 errorReported = 1;
 924                         }
 925                 }
 926
 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);
 930                         errorReported = 1;
 931                 }
 932
 933                 if(obj && !openDenied) {
 934                         int inodeId = yaffsfs_GetInodeIdForObject(obj);
 935
 936                         if(inodeId<0) {
 937                                 /*
 938                                  * Todo: Fix any problem if inodes run out, though that
 939                                  * can't happen if the number of inode items >= number of handles.
 940                                  */
 941                         }
 942
 943                         fd->inodeId = inodeId;
 944                         fd->reading = readRequested;
 945                         fd->writing = writeRequested;
 946                         fd->append =  (oflag & O_APPEND) ? 1 : 0;
 947                         fd->position = 0;
 948                         fd->shareRead = shareRead;
 949                         fd->shareWrite = shareWrite;
 950
 951                         /* Hook inode to object */
 952                         obj->my_inode = (void*) &yaffsfs_inode[inodeId];
 953
 954                         if((oflag & O_TRUNC) && fd->writing)
 955                                 yaffs_resize_file(obj,0);
 956                 } else {
 957                         yaffsfs_PutHandle(handle);
 958                         if(!errorReported)
 959                                 yaffsfs_SetError(0); /* Problem */
 960                         handle = -1;
 961                 }
 962         }
 963
 964         yaffsfs_Unlock();
 965
 966         return handle;
 967 }
 968
 969 int yaffs_open(const YCHAR *path, int oflag, int mode)
 970 {
 971         return yaffs_open_sharing(path, oflag, mode,
 972                         YAFFS_SHARE_READ | YAFFS_SHARE_WRITE);
 973 }
 974
 975 int yaffs_Dofsync(int handle,int datasync)
 976 {
 977         int retVal = -1;
 978         struct yaffs_obj *obj;
 979
 980         yaffsfs_Lock();
 981
 982         obj = yaffsfs_HandleToObject(handle);
 983
 984         if(!obj)
 985                 yaffsfs_SetError(-EBADF);
 986         else if(obj->my_dev->read_only)
 987                 yaffsfs_SetError(-EROFS);
 988         else {
 989                 yaffs_flush_file(obj,1,datasync);
 990                 retVal = 0;
 991         }
 992
 993         yaffsfs_Unlock();
 994
 995         return retVal;
 996 }
 997
 998 int yaffs_fsync(int handle)
 999 {
1000         return yaffs_Dofsync(handle,0);
1001 }
1002
1003 int yaffs_flush(int handle)
1004 {
1005         return yaffs_fsync(handle);
1006 }
1007
1008 int yaffs_fdatasync(int handle)
1009 {
1010         return yaffs_Dofsync(handle,1);
1011 }
1012
1013 int yaffs_close(int handle)
1014 {
1015         yaffsfs_Handle *h = NULL;
1016         struct yaffs_obj *obj = NULL;
1017         int retVal = -1;
1018
1019         yaffsfs_Lock();
1020
1021         h = yaffsfs_HandleToPointer(handle);
1022         obj = yaffsfs_HandleToObject(handle);
1023
1024         if(!h  || !obj)
1025                 yaffsfs_SetError(-EBADF);
1026         else {
1027                 /* clean up */
1028                 yaffs_flush_file(obj,1,0);
1029                 yaffsfs_PutHandle(handle);
1030                 retVal = 0;
1031         }
1032
1033         yaffsfs_Unlock();
1034
1035         return retVal;
1036 }
1037
1038
1039
1040 int yaffsfs_do_read(int handle, void *vbuf, unsigned int nbyte, int isPread, int offset)
1041 {
1042         yaffsfs_FileDes *fd = NULL;
1043         struct yaffs_obj *obj = NULL;
1044         int pos = 0;
1045         int startPos = 0;
1046         int endPos = 0;
1047         int nRead = 0;
1048         int nToRead = 0;
1049         int totalRead = 0;
1050         unsigned int maxRead;
1051         u8 *buf = (u8 *)vbuf;
1052
1053         if(!vbuf){
1054                 yaffsfs_SetError(-EFAULT);
1055                 return -1;
1056         }
1057
1058         yaffsfs_Lock();
1059         fd = yaffsfs_HandleToFileDes(handle);
1060         obj = yaffsfs_HandleToObject(handle);
1061
1062         if(!fd || !obj){
1063                 /* bad handle */
1064                 yaffsfs_SetError(-EBADF);
1065                 totalRead = -1;
1066         } else if(!fd->reading){
1067                 /* Not a reading handle */
1068                 yaffsfs_SetError(-EINVAL);
1069                 totalRead = -1;
1070         } else if(nbyte > YAFFS_MAX_FILE_SIZE){
1071                 yaffsfs_SetError(-EINVAL);
1072                 totalRead = -1;
1073         } else {
1074                 if(isPread)
1075                         startPos = offset;
1076                 else
1077                         startPos = fd->position;
1078
1079                 pos = startPos;
1080
1081                 if(yaffs_get_obj_length(obj) > pos)
1082                         maxRead = yaffs_get_obj_length(obj) - pos;
1083                 else
1084                         maxRead = 0;
1085
1086                 if(nbyte > maxRead)
1087                         nbyte = maxRead;
1088
1089
1090                 yaffsfs_GetHandle(handle);
1091
1092                 endPos = pos + nbyte;
1093
1094                 if(pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
1095                         nbyte > YAFFS_MAX_FILE_SIZE ||
1096                         endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE){
1097                         totalRead = -1;
1098                         nbyte = 0;
1099                 }
1100
1101                 while(nbyte > 0) {
1102                         nToRead = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
1103                         if(nToRead > nbyte)
1104                                 nToRead = nbyte;
1105
1106                         /* Tricky bit...
1107                          * Need to reverify object in case the device was
1108                          * unmounted in another thread.
1109                          */
1110                         obj = yaffsfs_HandleToObject(handle);
1111                         if(!obj)
1112                                 nRead = 0;
1113                         else
1114                                 nRead = yaffs_file_rd(obj,buf,pos,nToRead);
1115
1116                         if(nRead > 0){
1117                                 totalRead += nRead;
1118                                 pos += nRead;
1119                                 buf += nRead;
1120                         }
1121
1122                         if(nRead == nToRead)
1123                                 nbyte-=nRead;
1124                         else
1125                                 nbyte = 0; /* no more to read */
1126
1127
1128                         if(nbyte > 0){
1129                                 yaffsfs_Unlock();
1130                                 yaffsfs_Lock();
1131                         }
1132
1133                 }
1134
1135                 yaffsfs_PutHandle(handle);
1136
1137                 if(!isPread) {
1138                         if(totalRead >= 0)
1139                                 fd->position = startPos + totalRead;
1140                         else
1141                                 yaffsfs_SetError(-EINVAL);
1142                 }
1143
1144         }
1145
1146         yaffsfs_Unlock();
1147
1148         return (totalRead >= 0) ? totalRead : -1;
1149
1150 }
1151
1152 int yaffs_read(int handle, void *buf, unsigned int nbyte)
1153 {
1154         return yaffsfs_do_read(handle, buf, nbyte, 0, 0);
1155 }
1156
1157 int yaffs_pread(int handle, void *buf, unsigned int nbyte, unsigned int offset)
1158 {
1159         return yaffsfs_do_read(handle, buf, nbyte, 1, offset);
1160 }
1161
1162 int yaffsfs_do_write(int handle, const void *vbuf, unsigned int nbyte, int isPwrite, int offset)
1163 {
1164         yaffsfs_FileDes *fd = NULL;
1165         struct yaffs_obj *obj = NULL;
1166         int pos = 0;
1167         int startPos = 0;
1168         int endPos;
1169         int nWritten = 0;
1170         int totalWritten = 0;
1171         int write_trhrough = 0;
1172         int nToWrite = 0;
1173         const u8 *buf = (const u8 *)vbuf;
1174
1175         if(!vbuf){
1176                 yaffsfs_SetError(-EFAULT);
1177                 return -1;
1178         }
1179
1180         yaffsfs_Lock();
1181         fd = yaffsfs_HandleToFileDes(handle);
1182         obj = yaffsfs_HandleToObject(handle);
1183
1184         if(!fd || !obj){
1185                 /* bad handle */
1186                 yaffsfs_SetError(-EBADF);
1187                 totalWritten = -1;
1188         } else if(!fd->writing){
1189                 yaffsfs_SetError(-EINVAL);
1190                 totalWritten=-1;
1191         } else if(obj->my_dev->read_only){
1192                 yaffsfs_SetError(-EROFS);
1193                 totalWritten=-1;
1194         } else {
1195                 if(fd->append)
1196                         startPos = yaffs_get_obj_length(obj);
1197                 else if(isPwrite)
1198                         startPos = offset;
1199                 else
1200                         startPos = fd->position;
1201
1202                 yaffsfs_GetHandle(handle);
1203                 pos = startPos;
1204                 endPos = pos + nbyte;
1205
1206                 if(pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
1207                         nbyte > YAFFS_MAX_FILE_SIZE ||
1208                         endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE){
1209                         totalWritten = -1;
1210                         nbyte = 0;
1211                 }
1212
1213                 while(nbyte > 0) {
1214
1215                         nToWrite = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
1216                         if(nToWrite > nbyte)
1217                                 nToWrite = nbyte;
1218
1219                         /* Tricky bit...
1220                          * Need to reverify object in case the device was
1221                          * remounted or unmounted in another thread.
1222                          */
1223                         obj = yaffsfs_HandleToObject(handle);
1224                         if(!obj || obj->my_dev->read_only)
1225                                 nWritten = 0;
1226                         else
1227                                 nWritten = yaffs_wr_file(obj,buf,pos,nToWrite,
1228                                                         write_trhrough);
1229                         if(nWritten > 0){
1230                                 totalWritten += nWritten;
1231                                 pos += nWritten;
1232                                 buf += nWritten;
1233                         }
1234
1235                         if(nWritten == nToWrite)
1236                                 nbyte -= nToWrite;
1237                         else
1238                                 nbyte = 0;
1239
1240                         if(nWritten < 1 && totalWritten < 1){
1241                                 yaffsfs_SetError(-ENOSPC);
1242                                 totalWritten = -1;
1243                         }
1244
1245                         if(nbyte > 0){
1246                                 yaffsfs_Unlock();
1247                                 yaffsfs_Lock();
1248                         }
1249                 }
1250
1251                 yaffsfs_PutHandle(handle);
1252
1253                 if(!isPwrite){
1254                         if(totalWritten > 0)
1255                                 fd->position = startPos + totalWritten;
1256                         else
1257                                 yaffsfs_SetError(-EINVAL);
1258                 }
1259         }
1260
1261         yaffsfs_Unlock();
1262
1263         return (totalWritten >= 0) ? totalWritten : -1;
1264 }
1265
1266 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
1267 {
1268         return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
1269 }
1270
1271 int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, unsigned int offset)
1272 {
1273         return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
1274 }
1275
1276
1277 int yaffs_truncate(const YCHAR *path,off_t new_size)
1278 {
1279         struct yaffs_obj *obj = NULL;
1280         struct yaffs_obj *dir = NULL;
1281         int result = YAFFS_FAIL;
1282         int notDir = 0;
1283         int loop = 0;
1284
1285         if(!path){
1286                 yaffsfs_SetError(-EFAULT);
1287                 return -1;
1288         }
1289
1290         if(yaffsfs_CheckPath(path) < 0){
1291                 yaffsfs_SetError(-ENAMETOOLONG);
1292                 return -1;
1293         }
1294
1295         yaffsfs_Lock();
1296
1297         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1298         obj = yaffsfs_FollowLink(obj,0,&loop);
1299
1300         if(!dir && notDir)
1301                 yaffsfs_SetError(-ENOTDIR);
1302         else if(loop)
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);
1314         else
1315                 result = yaffs_resize_file(obj,new_size);
1316
1317         yaffsfs_Unlock();
1318
1319         return (result) ? 0 : -1;
1320 }
1321
1322 int yaffs_ftruncate(int handle, off_t new_size)
1323 {
1324         yaffsfs_FileDes *fd = NULL;
1325         struct yaffs_obj *obj = NULL;
1326         int result = 0;
1327
1328         yaffsfs_Lock();
1329         fd = yaffsfs_HandleToFileDes(handle);
1330         obj = yaffsfs_HandleToObject(handle);
1331
1332         if(!fd || !obj)
1333                 /* bad 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);
1341         else
1342                 /* resize the file */
1343                 result = yaffs_resize_file(obj,new_size);
1344         yaffsfs_Unlock();
1345
1346         return (result) ? 0 : -1;
1347
1348 }
1349
1350 off_t yaffs_lseek(int handle, off_t offset, int whence)
1351 {
1352         yaffsfs_FileDes *fd = NULL;
1353         struct yaffs_obj *obj = NULL;
1354         int pos = -1;
1355         int fSize = -1;
1356
1357         yaffsfs_Lock();
1358         fd = yaffsfs_HandleToFileDes(handle);
1359         obj = yaffsfs_HandleToObject(handle);
1360
1361         if(!fd || !obj)
1362                 yaffsfs_SetError(-EBADF);
1363         else if(offset > YAFFS_MAX_FILE_SIZE)
1364                 yaffsfs_SetError(-EINVAL);
1365         else {
1366                 if(whence == SEEK_SET){
1367                         if(offset >= 0)
1368                                 pos = offset;
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;
1376                 }
1377
1378                 if(pos >= 0 && pos <= YAFFS_MAX_FILE_SIZE)
1379                         fd->position = pos;
1380                 else{
1381                         yaffsfs_SetError(-EINVAL);
1382                         pos = -1;
1383                 }
1384         }
1385
1386         yaffsfs_Unlock();
1387
1388         return pos;
1389 }
1390
1391
1392 int yaffsfs_DoUnlink(const YCHAR *path,int isDirectory)
1393 {
1394         struct yaffs_obj *dir = NULL;
1395         struct yaffs_obj *obj = NULL;
1396         YCHAR *name;
1397         int result = YAFFS_FAIL;
1398         int notDir = 0;
1399         int loop = 0;
1400
1401         if(!path){
1402                 yaffsfs_SetError(-EFAULT);
1403                 return -1;
1404         }
1405
1406         if(yaffsfs_CheckPath(path) < 0){
1407                 yaffsfs_SetError(-ENAMETOOLONG);
1408                 return -1;
1409         }
1410
1411         yaffsfs_Lock();
1412
1413         obj = yaffsfs_FindObject(NULL,path,0,0,NULL,NULL,NULL);
1414         dir = yaffsfs_FindDirectory(NULL,path,&name,0,&notDir,&loop);
1415
1416         if(!dir && notDir)
1417                 yaffsfs_SetError(-ENOTDIR);
1418         else if(loop)
1419                 yaffsfs_SetError(-ELOOP);
1420         else if(!dir)
1421                 yaffsfs_SetError(-ENOENT);
1422         else if(strncmp(name,_Y("."),2) == 0)
1423                 yaffsfs_SetError(-EINVAL);
1424         else if(!obj)
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 */
1434         else {
1435                 result = yaffs_unlinker(dir,name);
1436
1437                 if(result == YAFFS_FAIL && isDirectory)
1438                         yaffsfs_SetError(-ENOTEMPTY);
1439         }
1440
1441         yaffsfs_Unlock();
1442
1443         return (result == YAFFS_FAIL) ? -1 : 0;
1444 }
1445
1446
1447 int yaffs_unlink(const YCHAR *path)
1448 {
1449         return yaffsfs_DoUnlink(path,0);
1450 }
1451
1452 int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
1453 {
1454         struct yaffs_obj *olddir = NULL;
1455         struct yaffs_obj *newdir = NULL;
1456         struct yaffs_obj *obj = NULL;
1457         struct yaffs_obj *newobj = NULL;
1458         YCHAR *oldname;
1459         YCHAR *newname;
1460         int result= YAFFS_FAIL;
1461         int rename_allowed = 1;
1462         int notOldDir = 0;
1463         int notNewDir = 0;
1464         int oldLoop = 0;
1465         int newLoop = 0;
1466
1467         YCHAR *alt_newpath=NULL;
1468
1469         if(!oldPath || !newPath){
1470                 yaffsfs_SetError(-EFAULT);
1471                 return -1;
1472         }
1473
1474         if(yaffsfs_CheckPath(oldPath) < 0 ||
1475                 yaffsfs_CheckPath(newPath) < 0){
1476                 yaffsfs_SetError(-ENAMETOOLONG);
1477                 return -1;
1478         }
1479
1480         if(yaffsfs_alt_dir_path(newPath, &alt_newpath) < 0){
1481                 yaffsfs_SetError(-ENOMEM);
1482                 return -1;
1483         }
1484         if(alt_newpath)
1485                 newPath = alt_newpath;
1486
1487         yaffsfs_Lock();
1488
1489
1490         olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0,&notOldDir,&oldLoop);
1491         newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0,&notNewDir,&newLoop);
1492         obj = yaffsfs_FindObject(NULL,oldPath,0,0,NULL,NULL,NULL);
1493         newobj = yaffsfs_FindObject(NULL,newPath,0,0,NULL,NULL,NULL);
1494
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.
1499          */
1500
1501         if(olddir == obj)
1502                 oldname = NULL;
1503
1504         if((!olddir && notOldDir) || (!newdir && notNewDir)) {
1505                 yaffsfs_SetError(-ENOTDIR);
1506                 rename_allowed = 0;
1507         } else if(oldLoop || newLoop) {
1508                 yaffsfs_SetError(-ELOOP);
1509                 rename_allowed = 0;
1510         } else if (olddir && oldname && strncmp(oldname, _Y("."),2) == 0){
1511                 yaffsfs_SetError(-EINVAL);
1512                 rename_allowed = 0;
1513         }else if(!olddir || !newdir || !obj) {
1514                 yaffsfs_SetError(-ENOENT);
1515                 rename_allowed = 0;
1516         } else if(obj->my_dev->read_only){
1517                 yaffsfs_SetError(-EROFS);
1518                 rename_allowed = 0;
1519         } else if(yaffs_is_non_empty_dir(newobj)){
1520                 yaffsfs_SetError(-ENOTEMPTY);
1521                 rename_allowed = 0;
1522         } else if(olddir->my_dev != newdir->my_dev) {
1523                 /* Rename must be on same device */
1524                 yaffsfs_SetError(-EXDEV);
1525                 rename_allowed = 0;
1526         } else if(obj && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
1527                 /*
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,
1531                  * checking for obj
1532                  */
1533
1534                 struct yaffs_obj *xx = newdir;
1535
1536                 while( rename_allowed && xx){
1537                         if(xx == obj)
1538                                 rename_allowed = 0;
1539                         xx = xx->parent;
1540                 }
1541                 if(!rename_allowed)
1542                         yaffsfs_SetError(-EINVAL);
1543         }
1544
1545         if(rename_allowed)
1546                 result = yaffs_rename_obj(olddir,oldname,newdir,newname);
1547
1548         yaffsfs_Unlock();
1549
1550         if(alt_newpath)
1551                 kfree(alt_newpath);
1552
1553         return (result == YAFFS_FAIL) ? -1 : 0;
1554 }
1555
1556
1557 static int yaffsfs_DoStat(struct yaffs_obj *obj,struct yaffs_stat *buf)
1558 {
1559         int retVal = -1;
1560
1561         obj = yaffs_get_equivalent_obj(obj);
1562
1563         if(obj && buf){
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 */
1567
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;
1574
1575                 buf->st_nlink = yaffs_get_obj_link_count(obj);
1576                 buf->st_uid = 0;
1577                 buf->st_gid = 0;;
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];
1589 #else
1590                 buf->yst_atime = obj->yst_atime;
1591                 buf->yst_ctime = obj->yst_ctime;
1592                 buf->yst_mtime = obj->yst_mtime;
1593 #endif
1594                 retVal = 0;
1595         }
1596         return retVal;
1597 }
1598
1599 static int yaffsfs_DoStatOrLStat(const YCHAR *path, struct yaffs_stat *buf,int doLStat)
1600 {
1601         struct yaffs_obj *obj=NULL;
1602         struct yaffs_obj *dir=NULL;
1603         int retVal = -1;
1604         int notDir = 0;
1605         int loop = 0;
1606
1607         if(!path || !buf){
1608                 yaffsfs_SetError(-EFAULT);
1609                 return -1;
1610         }
1611
1612         if(yaffsfs_CheckPath(path) < 0){
1613                 yaffsfs_SetError(-ENAMETOOLONG);
1614                 return -1;
1615         }
1616
1617         yaffsfs_Lock();
1618
1619         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1620
1621         if(!doLStat && obj)
1622                 obj = yaffsfs_FollowLink(obj,0,&loop);
1623
1624         if(!dir && notDir)
1625                 yaffsfs_SetError(-ENOTDIR);
1626         else if(loop)
1627                 yaffsfs_SetError(-ELOOP);
1628         else if(!dir || !obj)
1629                 yaffsfs_SetError(-ENOENT);
1630         else
1631                 retVal = yaffsfs_DoStat(obj,buf);
1632
1633         yaffsfs_Unlock();
1634
1635         return retVal;
1636
1637 }
1638
1639 int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
1640 {
1641         return yaffsfs_DoStatOrLStat(path,buf,0);
1642 }
1643
1644 int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
1645 {
1646         return yaffsfs_DoStatOrLStat(path,buf,1);
1647 }
1648
1649 int yaffs_fstat(int fd, struct yaffs_stat *buf)
1650 {
1651         struct yaffs_obj *obj;
1652
1653         int retVal = -1;
1654
1655         if(!buf){
1656                 yaffsfs_SetError(-EFAULT);
1657                 return -1;
1658         }
1659
1660         yaffsfs_Lock();
1661         obj = yaffsfs_HandleToObject(fd);
1662
1663         if(obj)
1664                 retVal = yaffsfs_DoStat(obj,buf);
1665         else
1666                 /* bad handle */
1667                 yaffsfs_SetError(-EBADF);
1668
1669         yaffsfs_Unlock();
1670
1671         return retVal;
1672 }
1673
1674 #ifndef CONFIG_YAFFS_WINCE
1675 /* xattrib functions */
1676
1677
1678 static int yaffs_do_setxattr(const YCHAR *path, const char *name,
1679                         const void *data, int size, int flags, int follow)
1680 {
1681         struct yaffs_obj *obj;
1682         struct yaffs_obj *dir;
1683         int notDir = 0;
1684         int loop = 0;
1685
1686         int retVal = -1;
1687
1688         if(!path || !name || !data){
1689                 yaffsfs_SetError(-EFAULT);
1690                 return -1;
1691         }
1692
1693         if(yaffsfs_CheckPath(path) < 0){
1694                 yaffsfs_SetError(-ENAMETOOLONG);
1695                 return -1;
1696         }
1697
1698         yaffsfs_Lock();
1699
1700         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1701
1702         if(follow)
1703                 obj = yaffsfs_FollowLink(obj,0,&loop);
1704
1705         if(!dir && notDir)
1706                 yaffsfs_SetError(-ENOTDIR);
1707         else if(loop)
1708                 yaffsfs_SetError(-ELOOP);
1709         else if(!dir || !obj)
1710                 yaffsfs_SetError(-ENOENT);
1711         else {
1712                 retVal = yaffs_set_xattrib(obj,name,data,size,flags);
1713                 if(retVal< 0){
1714                         yaffsfs_SetError(retVal);
1715                         retVal = -1;
1716                 }
1717         }
1718
1719         yaffsfs_Unlock();
1720
1721         return retVal;
1722
1723 }
1724
1725 int yaffs_setxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1726 {
1727         return yaffs_do_setxattr(path, name, data, size, flags, 1);
1728 }
1729
1730 int yaffs_lsetxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1731 {
1732         return yaffs_do_setxattr(path, name, data, size, flags, 0);
1733 }
1734
1735
1736
1737 int yaffs_fsetxattr(int fd, const char *name, const void *data, int size, int flags)
1738 {
1739         struct yaffs_obj *obj;
1740
1741         int retVal = -1;
1742
1743         if(!name || !data){
1744                 yaffsfs_SetError(-EFAULT);
1745                 return -1;
1746         }
1747
1748         yaffsfs_Lock();
1749         obj = yaffsfs_HandleToObject(fd);
1750
1751         if(!obj)
1752                 yaffsfs_SetError(-EBADF);
1753         else {
1754                 retVal = yaffs_set_xattrib(obj,name,data,size,flags);
1755                 if(retVal< 0){
1756                         yaffsfs_SetError(retVal);
1757                         retVal = -1;
1758                 }
1759         }
1760
1761         yaffsfs_Unlock();
1762
1763         return retVal;
1764 }
1765
1766 static int yaffs_do_getxattr(const YCHAR *path, const char *name, void *data, int size, int follow)
1767 {
1768         struct yaffs_obj *obj;
1769         struct yaffs_obj *dir;
1770         int retVal = -1;
1771         int notDir = 0;
1772         int loop = 0;
1773
1774         if(!path || !name || !data ){
1775                 yaffsfs_SetError(-EFAULT);
1776                 return -1;
1777         }
1778
1779         if(yaffsfs_CheckPath(path) < 0){
1780                 yaffsfs_SetError(-ENAMETOOLONG);
1781                 return -1;
1782         }
1783
1784         yaffsfs_Lock();
1785
1786         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1787
1788         if(follow)
1789                 obj = yaffsfs_FollowLink(obj,0,&loop);
1790
1791         if(!dir && notDir)
1792                 yaffsfs_SetError(-ENOTDIR);
1793         else if(loop)
1794                 yaffsfs_SetError(-ELOOP);
1795         else if(!dir || !obj)
1796                 yaffsfs_SetError(-ENOENT);
1797         else {
1798                 retVal = yaffs_get_xattrib(obj,name,data,size);
1799                 if(retVal< 0){
1800                         yaffsfs_SetError(retVal);
1801                         retVal = -1;
1802                 }
1803         }
1804         yaffsfs_Unlock();
1805
1806         return retVal;
1807
1808 }
1809
1810 int yaffs_getxattr(const YCHAR *path, const char *name, void *data, int size)
1811 {
1812         return yaffs_do_getxattr( path, name, data, size, 1);
1813 }
1814 int yaffs_lgetxattr(const YCHAR *path, const char *name, void *data, int size)
1815 {
1816         return yaffs_do_getxattr( path, name, data, size, 0);
1817 }
1818
1819
1820
1821 int yaffs_fgetxattr(int fd, const char *name, void *data, int size)
1822 {
1823         struct yaffs_obj *obj;
1824
1825         int retVal = -1;
1826
1827         if(!name || !data ){
1828                 yaffsfs_SetError(-EFAULT);
1829                 return -1;
1830         }
1831
1832         yaffsfs_Lock();
1833         obj = yaffsfs_HandleToObject(fd);
1834
1835         if(obj) {
1836                 retVal = yaffs_get_xattrib(obj,name,data,size);
1837                 if(retVal< 0){
1838                         yaffsfs_SetError(retVal);
1839                         retVal = -1;
1840                 }
1841         } else
1842                 /* bad handle */
1843                 yaffsfs_SetError(-EBADF);
1844
1845         yaffsfs_Unlock();
1846
1847         return retVal;
1848 }
1849
1850 static int yaffs_do_listxattr(const YCHAR *path, char *data, int size, int follow)
1851 {
1852         struct yaffs_obj *obj=NULL;
1853         struct yaffs_obj *dir=NULL;
1854         int retVal = -1;
1855         int notDir = 0;
1856         int loop = 0;
1857
1858         if(!path || !data ){
1859                 yaffsfs_SetError(-EFAULT);
1860                 return -1;
1861         }
1862
1863         if(yaffsfs_CheckPath(path) < 0){
1864                 yaffsfs_SetError(-ENAMETOOLONG);
1865                 return -1;
1866         }
1867
1868         yaffsfs_Lock();
1869
1870         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1871
1872         if(follow)
1873                 obj = yaffsfs_FollowLink(obj,0,&loop);
1874
1875         if(!dir && notDir)
1876                 yaffsfs_SetError(-ENOTDIR);
1877         else if(loop)
1878                 yaffsfs_SetError(-ELOOP);
1879         else if(!dir || !obj)
1880                 yaffsfs_SetError(-ENOENT);
1881         else {
1882                 retVal = yaffs_list_xattrib(obj, data,size);
1883                 if(retVal< 0){
1884                         yaffsfs_SetError(retVal);
1885                         retVal = -1;
1886                 }
1887         }
1888
1889         yaffsfs_Unlock();
1890
1891         return retVal;
1892
1893 }
1894
1895 int yaffs_listxattr(const YCHAR *path, char *data, int size)
1896 {
1897         return yaffs_do_listxattr(path, data, size, 1);
1898 }
1899
1900 int yaffs_llistxattr(const YCHAR *path, char *data, int size)
1901 {
1902         return yaffs_do_listxattr(path, data, size, 0);
1903 }
1904
1905 int yaffs_flistxattr(int fd, char *data, int size)
1906 {
1907         struct yaffs_obj *obj;
1908
1909         int retVal = -1;
1910
1911         if(!data ){
1912                 yaffsfs_SetError(-EFAULT);
1913                 return -1;
1914         }
1915
1916         yaffsfs_Lock();
1917         obj = yaffsfs_HandleToObject(fd);
1918
1919         if(obj) {
1920                 retVal = yaffs_list_xattrib(obj,data,size);
1921                 if(retVal< 0){
1922                         yaffsfs_SetError(retVal);
1923                         retVal = -1;
1924                 }
1925         } else
1926                 /* bad handle */
1927                 yaffsfs_SetError(-EBADF);
1928
1929         yaffsfs_Unlock();
1930
1931         return retVal;
1932 }
1933
1934 static int yaffs_do_removexattr(const YCHAR *path, const char *name, int follow)
1935 {
1936         struct yaffs_obj *obj=NULL;
1937         struct yaffs_obj *dir=NULL;
1938         int notDir = 0;
1939         int loop = 0;
1940         int retVal = -1;
1941
1942         if(!path || !name){
1943                 yaffsfs_SetError(-EFAULT);
1944                 return -1;
1945         }
1946
1947         if(yaffsfs_CheckPath(path) < 0){
1948                 yaffsfs_SetError(-ENAMETOOLONG);
1949                 return -1;
1950         }
1951
1952         yaffsfs_Lock();
1953
1954         obj = yaffsfs_FindObject(NULL,path,0,1, &dir,&notDir,&loop);
1955
1956         if(follow)
1957                 obj = yaffsfs_FollowLink(obj,0,&loop);
1958
1959         if(!dir && notDir)
1960                 yaffsfs_SetError(-ENOTDIR);
1961         else if(loop)
1962                 yaffsfs_SetError(-ELOOP);
1963         else if(!dir || !obj)
1964                 yaffsfs_SetError(-ENOENT);
1965         else {
1966                 retVal = yaffs_remove_xattrib(obj,name);
1967                 if(retVal< 0){
1968                         yaffsfs_SetError(retVal);
1969                         retVal = -1;
1970                 }
1971         }
1972
1973         yaffsfs_Unlock();
1974
1975         return retVal;
1976
1977 }
1978
1979 int yaffs_removexattr(const YCHAR *path, const char *name)
1980 {
1981         return yaffs_do_removexattr(path, name, 1);
1982 }
1983
1984 int yaffs_lremovexattr(const YCHAR *path, const char *name)
1985 {
1986         return yaffs_do_removexattr(path, name, 0);
1987 }
1988
1989 int yaffs_fremovexattr(int fd, const char *name)
1990 {
1991         struct yaffs_obj *obj;
1992
1993         int retVal = -1;
1994
1995         if(!name){
1996                 yaffsfs_SetError(-EFAULT);
1997                 return -1;
1998         }
1999
2000         yaffsfs_Lock();
2001         obj = yaffsfs_HandleToObject(fd);
2002
2003         if(obj){
2004                 retVal = yaffs_remove_xattrib(obj,name);
2005                 if(retVal< 0){
2006                         yaffsfs_SetError(retVal);
2007                         retVal = -1;
2008                 }
2009         }else
2010                 /* bad handle */
2011                 yaffsfs_SetError(-EBADF);
2012
2013         yaffsfs_Unlock();
2014
2015         return retVal;
2016 }
2017 #endif
2018
2019 #ifdef CONFIG_YAFFS_WINCE
2020 int yaffs_get_wince_times(int fd, unsigned *wctime, unsigned *watime, unsigned *wmtime)
2021 {
2022         struct yaffs_obj *obj;
2023
2024         int retVal = -1;
2025
2026         yaffsfs_Lock();
2027         obj = yaffsfs_HandleToObject(fd);
2028
2029         if(obj){
2030
2031                 if(wctime){
2032                         wctime[0] = obj->win_ctime[0];
2033                         wctime[1] = obj->win_ctime[1];
2034                 }
2035                 if(watime){
2036                         watime[0] = obj->win_atime[0];
2037                         watime[1] = obj->win_atime[1];
2038                 }
2039                 if(wmtime){
2040                         wmtime[0] = obj->win_mtime[0];
2041                         wmtime[1] = obj->win_mtime[1];
2042                 }
2043
2044
2045                 retVal = 0;
2046         } else
2047                 /*  bad handle */
2048                 yaffsfs_SetError(-EBADF);
2049
2050         yaffsfs_Unlock();
2051
2052         return retVal;
2053 }
2054
2055
2056 int yaffs_set_wince_times(int fd,
2057                                                   const unsigned *wctime,
2058                                                   const unsigned *watime,
2059                                                   const unsigned *wmtime)
2060 {
2061         struct yaffs_obj *obj;
2062         int result;
2063         int retVal = -1;
2064
2065         yaffsfs_Lock();
2066         obj = yaffsfs_HandleToObject(fd);
2067
2068         if(obj){
2069
2070                 if(wctime){
2071                         obj->win_ctime[0] = wctime[0];
2072                         obj->win_ctime[1] = wctime[1];
2073                 }
2074                 if(watime){
2075                         obj->win_atime[0] = watime[0];
2076                         obj->win_atime[1] = watime[1];
2077                 }
2078                 if(wmtime){
2079                         obj->win_mtime[0] = wmtime[0];
2080                         obj->win_mtime[1] = wmtime[1];
2081                 }
2082
2083                 obj->dirty = 1;
2084                 result = yaffs_flush_file(obj,0,0);
2085                 retVal = 0;
2086         } else
2087                 /* bad handle */
2088                 yaffsfs_SetError(-EBADF);
2089
2090         yaffsfs_Unlock();
2091
2092         return retVal;
2093 }
2094
2095 #endif
2096
2097
2098 static int yaffsfs_DoChMod(struct yaffs_obj *obj,mode_t mode)
2099 {
2100         int result = -1;
2101
2102         if(obj)
2103                 obj = yaffs_get_equivalent_obj(obj);
2104
2105         if(obj) {
2106                 obj->yst_mode = mode;
2107                 obj->dirty = 1;
2108                 result = yaffs_flush_file(obj,0,0);
2109         }
2110
2111         return result == YAFFS_OK ? 0 : -1;
2112 }
2113
2114
2115 int yaffs_access(const YCHAR *path, int amode)
2116 {
2117         struct yaffs_obj *obj=NULL;
2118         struct yaffs_obj *dir=NULL;
2119         int notDir = 0;
2120         int loop = 0;
2121         int retval = -1;
2122
2123         if(!path){
2124                 yaffsfs_SetError(-EFAULT);
2125                 return -1;
2126         }
2127
2128         if(yaffsfs_CheckPath(path) < 0){
2129                 yaffsfs_SetError(-ENAMETOOLONG);
2130                 return -1;
2131         }
2132
2133         if(amode & ~(R_OK | W_OK | X_OK)){
2134                 yaffsfs_SetError(-EINVAL);
2135                 return -1;
2136         }
2137
2138         yaffsfs_Lock();
2139
2140         obj = yaffsfs_FindObject(NULL,path,0,1, &dir,&notDir,&loop);
2141         obj = yaffsfs_FollowLink(obj,0,&loop);
2142
2143         if(!dir && notDir)
2144                 yaffsfs_SetError(-ENOTDIR);
2145         else if(loop)
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);
2151         else{
2152                 int access_ok = 1;
2153
2154                 if((amode & R_OK) && !(obj->yst_mode & S_IREAD))
2155                         access_ok = 0;
2156                 if((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
2157                         access_ok = 0;
2158                 if((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
2159                         access_ok = 0;
2160
2161                 if(!access_ok)
2162                         yaffsfs_SetError(-EACCES);
2163                 else
2164                         retval = 0;
2165         }
2166
2167         yaffsfs_Unlock();
2168
2169         return retval;
2170
2171 }
2172
2173
2174 int yaffs_chmod(const YCHAR *path, mode_t mode)
2175 {
2176         struct yaffs_obj *obj=NULL;
2177         struct yaffs_obj *dir=NULL;
2178         int retVal = -1;
2179         int notDir = 0;
2180         int loop = 0;
2181
2182         if(!path){
2183                 yaffsfs_SetError(-EFAULT);
2184                 return -1;
2185         }
2186
2187         if(yaffsfs_CheckPath(path) < 0){
2188                 yaffsfs_SetError(-ENAMETOOLONG);
2189                 return -1;
2190         }
2191
2192         if(mode & ~(0777)){
2193                 yaffsfs_SetError(-EINVAL);
2194                 return -1;
2195         }
2196
2197         yaffsfs_Lock();
2198
2199         obj = yaffsfs_FindObject(NULL,path,0,1, &dir, &notDir,&loop);
2200         obj = yaffsfs_FollowLink(obj,0,&loop);
2201
2202         if(!dir && notDir)
2203                 yaffsfs_SetError(-ENOTDIR);
2204         else if(loop)
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);
2210         else
2211                 retVal = yaffsfs_DoChMod(obj,mode);
2212
2213         yaffsfs_Unlock();
2214
2215         return retVal;
2216
2217 }
2218
2219
2220 int yaffs_fchmod(int fd, mode_t mode)
2221 {
2222         struct yaffs_obj *obj;
2223         int retVal = -1;
2224
2225         if(mode & ~(0777)){
2226                 yaffsfs_SetError(-EINVAL);
2227                 return -1;
2228         }
2229
2230         yaffsfs_Lock();
2231         obj = yaffsfs_HandleToObject(fd);
2232
2233         if(!obj)
2234                 yaffsfs_SetError(-EBADF);
2235         else if(obj->my_dev->read_only)
2236                 yaffsfs_SetError(-EROFS);
2237         else
2238                 retVal = yaffsfs_DoChMod(obj,mode);
2239
2240         yaffsfs_Unlock();
2241
2242         return retVal;
2243 }
2244
2245 int yaffs_mkdir(const YCHAR *path, mode_t mode)
2246 {
2247         struct yaffs_obj *parent = NULL;
2248         struct yaffs_obj *dir = NULL;
2249         YCHAR *name;
2250         YCHAR *alt_path = NULL;
2251         int retVal= -1;
2252         int notDir = 0;
2253         int loop = 0;
2254
2255         if(!path){
2256                 yaffsfs_SetError(-EFAULT);
2257                 return -1;
2258         }
2259
2260         if(yaffsfs_CheckPath(path) < 0){
2261                 yaffsfs_SetError(-ENAMETOOLONG);
2262                 return -1;
2263         }
2264
2265         if(yaffsfs_alt_dir_path(path, &alt_path) < 0){
2266                 yaffsfs_SetError(-ENOMEM);
2267                 return -1;
2268         }
2269         if(alt_path)
2270                 path = alt_path;
2271
2272         yaffsfs_Lock();
2273         parent = yaffsfs_FindDirectory(NULL,path,&name,0,&notDir,&loop);
2274         if(!parent && notDir)
2275                 yaffsfs_SetError(-ENOTDIR);
2276         else if(loop)
2277                 yaffsfs_SetError(-ELOOP);
2278         else if(!parent)
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);
2285         else {
2286                 dir = yaffs_create_dir(parent,name,mode,0,0);
2287                 if(dir)
2288                         retVal = 0;
2289                 else if (yaffs_find_by_name(parent,name))
2290                         yaffsfs_SetError(-EEXIST); /* the name already exists */
2291                 else
2292                         yaffsfs_SetError(-ENOSPC); /* just assume no space */
2293         }
2294
2295         yaffsfs_Unlock();
2296
2297         if(alt_path)
2298                 kfree(alt_path);
2299
2300         return retVal;
2301 }
2302
2303 int yaffs_rmdir(const YCHAR *path)
2304 {
2305         int result;
2306         YCHAR *alt_path;
2307
2308         if(!path){
2309                 yaffsfs_SetError(-EFAULT);
2310                 return -1;
2311         }
2312
2313         if(yaffsfs_CheckPath(path) < 0){
2314                 yaffsfs_SetError(-ENAMETOOLONG);
2315                 return -1;
2316         }
2317
2318         if(yaffsfs_alt_dir_path(path, &alt_path) < 0){
2319                 yaffsfs_SetError(-ENOMEM);
2320                 return -1;
2321         }
2322         if(alt_path)
2323                 path = alt_path;
2324         result =  yaffsfs_DoUnlink(path,1);
2325         if(alt_path)
2326                 kfree(alt_path);
2327         return result;
2328 }
2329
2330
2331 void * yaffs_getdev(const YCHAR *path)
2332 {
2333         struct yaffs_dev *dev=NULL;
2334         YCHAR *dummy;
2335         dev = yaffsfs_FindDevice(path,&dummy);
2336         return (void *)dev;
2337 }
2338
2339 int yaffs_mount2(const YCHAR *path,int read_only)
2340 {
2341         int retVal=-1;
2342         int result=YAFFS_FAIL;
2343         struct yaffs_dev *dev=NULL;
2344
2345         if(!path){
2346                 yaffsfs_SetError(-EFAULT);
2347                 return -1;
2348         }
2349
2350         yaffs_trace(YAFFS_TRACE_MOUNT,"yaffs: Mounting %s",path);
2351
2352         if(yaffsfs_CheckPath(path) < 0){
2353                 yaffsfs_SetError(-ENAMETOOLONG);
2354                 return -1;
2355         }
2356
2357         yaffsfs_Lock();
2358
2359         yaffsfs_InitHandles();
2360
2361         dev = yaffsfs_FindMountPoint(path);
2362         if(dev){
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;
2369
2370                 }
2371                 else
2372                         yaffsfs_SetError(-EBUSY);
2373         } else
2374                 yaffsfs_SetError(-ENODEV);
2375
2376         yaffsfs_Unlock();
2377         return retVal;
2378
2379 }
2380
2381 int yaffs_mount(const YCHAR *path)
2382 {
2383         return yaffs_mount2(path,0);
2384 }
2385
2386 int yaffs_sync(const YCHAR *path)
2387 {
2388         int retVal=-1;
2389         struct yaffs_dev *dev=NULL;
2390         YCHAR *dummy;
2391
2392         if(!path){
2393                 yaffsfs_SetError(-EFAULT);
2394                 return -1;
2395         }
2396
2397         if(yaffsfs_CheckPath(path) < 0){
2398                 yaffsfs_SetError(-ENAMETOOLONG);
2399                 return -1;
2400         }
2401
2402         yaffsfs_Lock();
2403         dev = yaffsfs_FindDevice(path,&dummy);
2404         if(dev){
2405                 if(!dev->is_mounted)
2406                         yaffsfs_SetError(-EINVAL);
2407                 else if(dev->read_only)
2408                         yaffsfs_SetError(-EROFS);
2409                 else {
2410
2411                         yaffs_flush_whole_cache(dev);
2412                         yaffs_checkpoint_save(dev);
2413                         retVal = 0;
2414
2415                 }
2416         }else
2417                 yaffsfs_SetError(-ENODEV);
2418
2419         yaffsfs_Unlock();
2420         return retVal;
2421 }
2422
2423
2424 static int yaffsfs_IsDevBusy(struct yaffs_dev * dev)
2425 {
2426         int i;
2427         struct yaffs_obj *obj;
2428
2429         for(i = 0; i < YAFFSFS_N_HANDLES; i++){
2430                 obj = yaffsfs_HandleToObject(i);
2431                 if(obj && obj->my_dev == dev)
2432                 return 1;
2433         }
2434         return 0;
2435 }
2436
2437
2438 int yaffs_remount(const YCHAR *path, int force, int read_only)
2439 {
2440         int retVal=-1;
2441         struct yaffs_dev *dev=NULL;
2442
2443         if(!path){
2444                 yaffsfs_SetError(-EFAULT);
2445                 return -1;
2446         }
2447
2448         if(yaffsfs_CheckPath(path) < 0){
2449                 yaffsfs_SetError(-ENAMETOOLONG);
2450                 return -1;
2451         }
2452
2453         yaffsfs_Lock();
2454         dev = yaffsfs_FindMountPoint(path);
2455         if(dev){
2456                 if(dev->is_mounted){
2457                         yaffs_flush_whole_cache(dev);
2458
2459                         if(force || ! yaffsfs_IsDevBusy(dev)){
2460                                 if(read_only)
2461                                         yaffs_checkpoint_save(dev);
2462                                 dev->read_only =  read_only ? 1 : 0;
2463                                 retVal = 0;
2464                         } else
2465                                 yaffsfs_SetError(-EBUSY);
2466
2467                 } else
2468                         yaffsfs_SetError(-EINVAL);
2469
2470         }
2471         else
2472                 yaffsfs_SetError(-ENODEV);
2473
2474         yaffsfs_Unlock();
2475         return retVal;
2476
2477 }
2478
2479 int yaffs_unmount2(const YCHAR *path, int force)
2480 {
2481         int retVal=-1;
2482         struct yaffs_dev *dev=NULL;
2483
2484         if(!path){
2485                 yaffsfs_SetError(-EFAULT);
2486                 return -1;
2487         }
2488
2489         if(yaffsfs_CheckPath(path) < 0){
2490                 yaffsfs_SetError(-ENAMETOOLONG);
2491                 return -1;
2492         }
2493
2494         yaffsfs_Lock();
2495         dev = yaffsfs_FindMountPoint(path);
2496         if(dev){
2497                 if(dev->is_mounted){
2498                         int inUse;
2499                         yaffs_flush_whole_cache(dev);
2500                         yaffs_checkpoint_save(dev);
2501                         inUse = yaffsfs_IsDevBusy(dev);
2502                         if(!inUse || force){
2503                                 if(inUse)
2504                                         yaffsfs_BreakDeviceHandles(dev);
2505                                 yaffs_deinitialise(dev);
2506
2507                                 retVal = 0;
2508                         } else
2509                                 yaffsfs_SetError(-EBUSY);
2510
2511                 } else
2512                         yaffsfs_SetError(-EINVAL);
2513
2514         } else
2515                 yaffsfs_SetError(-ENODEV);
2516
2517         yaffsfs_Unlock();
2518         return retVal;
2519
2520 }
2521
2522 int yaffs_unmount(const YCHAR *path)
2523 {
2524         return yaffs_unmount2(path,0);
2525 }
2526
2527 loff_t yaffs_freespace(const YCHAR *path)
2528 {
2529         loff_t retVal=-1;
2530         struct yaffs_dev *dev=NULL;
2531         YCHAR *dummy;
2532
2533         if(!path){
2534                 yaffsfs_SetError(-EFAULT);
2535                 return -1;
2536         }
2537
2538         if(yaffsfs_CheckPath(path) < 0){
2539                 yaffsfs_SetError(-ENAMETOOLONG);
2540                 return -1;
2541         }
2542
2543         yaffsfs_Lock();
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;
2548
2549         } else
2550                 yaffsfs_SetError(-EINVAL);
2551
2552         yaffsfs_Unlock();
2553         return retVal;
2554 }
2555
2556 loff_t yaffs_totalspace(const YCHAR *path)
2557 {
2558         loff_t retVal=-1;
2559         struct yaffs_dev *dev=NULL;
2560         YCHAR *dummy;
2561
2562         if(!path){
2563                 yaffsfs_SetError(-EFAULT);
2564                 return -1;
2565         }
2566
2567         if(yaffsfs_CheckPath(path) < 0){
2568                 yaffsfs_SetError(-ENAMETOOLONG);
2569                 return -1;
2570         }
2571
2572         yaffsfs_Lock();
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;
2579
2580         } else
2581                 yaffsfs_SetError(-EINVAL);
2582
2583         yaffsfs_Unlock();
2584         return retVal;
2585 }
2586
2587 int yaffs_inodecount(const YCHAR *path)
2588 {
2589         loff_t retVal= -1;
2590         struct yaffs_dev *dev=NULL;
2591         YCHAR *dummy;
2592
2593         if(!path){
2594                 yaffsfs_SetError(-EFAULT);
2595                 return -1;
2596         }
2597
2598         if(yaffsfs_CheckPath(path) < 0){
2599                 yaffsfs_SetError(-ENAMETOOLONG);
2600                 return -1;
2601         }
2602
2603         yaffsfs_Lock();
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;
2609         }
2610
2611         if(retVal < 0)
2612                 yaffsfs_SetError(-EINVAL);
2613
2614         yaffsfs_Unlock();
2615         return retVal;
2616 }
2617
2618
2619 void yaffs_add_device(struct yaffs_dev *dev)
2620 {
2621         dev->is_mounted = 0;
2622         dev->param.remove_obj_fn = yaffsfs_RemoveObjectCallback;
2623
2624         if(!dev->dev_list.next)
2625                 INIT_LIST_HEAD(&dev->dev_list);
2626
2627         list_add(&dev->dev_list,&yaffsfs_deviceList);
2628 }
2629
2630 void yaffs_remove_device(struct yaffs_dev *dev)
2631 {
2632         list_del_init(&dev->dev_list);
2633 }
2634
2635
2636
2637
2638 /* Directory search stuff. */
2639
2640 /*
2641  * Directory search context
2642  *
2643  * NB this is an opaque structure.
2644  */
2645
2646
2647 typedef struct
2648 {
2649         u32 magic;
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 */
2654         int offset;
2655         struct list_head others;
2656 } yaffsfs_DirectorySearchContext;
2657
2658
2659
2660 static struct list_head search_contexts;
2661
2662
2663 static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
2664 {
2665         if(dsc &&
2666            dsc->dirObj &&
2667            dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2668
2669            dsc->offset = 0;
2670
2671            if( list_empty(&dsc->dirObj->variant.dir_variant.children))
2672                 dsc->nextReturn = NULL;
2673            else
2674                 dsc->nextReturn = list_entry(dsc->dirObj->variant.dir_variant.children.next,
2675                                                 struct yaffs_obj,siblings);
2676         } else {
2677                 /* Hey someone isn't playing nice! */
2678         }
2679 }
2680
2681 static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
2682 {
2683         if(dsc &&
2684            dsc->dirObj &&
2685            dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2686
2687            if( dsc->nextReturn == NULL ||
2688                list_empty(&dsc->dirObj->variant.dir_variant.children))
2689                 dsc->nextReturn = NULL;
2690            else {
2691                    struct list_head *next = dsc->nextReturn->siblings.next;
2692
2693                    if( next == &dsc->dirObj->variant.dir_variant.children)
2694                         dsc->nextReturn = NULL; /* end of list */
2695                    else
2696                         dsc->nextReturn = list_entry(next,struct yaffs_obj,siblings);
2697            }
2698         } else {
2699                 /* Hey someone isn't playing nice! */
2700         }
2701 }
2702
2703 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj)
2704 {
2705
2706         struct list_head *i;
2707         yaffsfs_DirectorySearchContext *dsc;
2708
2709         /* if search contexts not initilised then skip */
2710         if(!search_contexts.next)
2711                 return;
2712
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.
2716          */
2717          list_for_each(i, &search_contexts) {
2718                 if (i) {
2719                         dsc = list_entry(i, yaffsfs_DirectorySearchContext,others);
2720                         if(dsc->nextReturn == obj)
2721                                 yaffsfs_DirAdvance(dsc);
2722                 }
2723         }
2724
2725 }
2726
2727 yaffs_DIR *yaffs_opendir(const YCHAR *dirname)
2728 {
2729         yaffs_DIR *dir = NULL;
2730         struct yaffs_obj *obj = NULL;
2731         yaffsfs_DirectorySearchContext *dsc = NULL;
2732         int notDir = 0;
2733         int loop = 0;
2734
2735         if(!dirname){
2736                 yaffsfs_SetError(-EFAULT);
2737                 return NULL;
2738         }
2739
2740         if(yaffsfs_CheckPath(dirname) < 0){
2741                 yaffsfs_SetError(-ENAMETOOLONG);
2742                 return NULL;
2743         }
2744
2745         yaffsfs_Lock();
2746
2747         obj = yaffsfs_FindObject(NULL,dirname,0,1,NULL,&notDir,&loop);
2748
2749         if(!obj && notDir)
2750                 yaffsfs_SetError(-ENOTDIR);
2751         else if(loop)
2752                 yaffsfs_SetError(-ELOOP);
2753         else if(!obj)
2754                 yaffsfs_SetError(-ENOENT);
2755         else if(obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
2756                 yaffsfs_SetError(-ENOTDIR);
2757         else {
2758
2759                 dsc = kmalloc(sizeof(yaffsfs_DirectorySearchContext), 0);
2760                 dir = (yaffs_DIR *)dsc;
2761
2762                 if(dsc){
2763                         memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
2764                         dsc->magic = YAFFS_MAGIC;
2765                         dsc->dirObj = obj;
2766                         strncpy(dsc->name,dirname,NAME_MAX);
2767                         INIT_LIST_HEAD(&dsc->others);
2768
2769                         if(!search_contexts.next)
2770                                 INIT_LIST_HEAD(&search_contexts);
2771
2772                         list_add(&dsc->others,&search_contexts);
2773                         yaffsfs_SetDirRewound(dsc);
2774                 }
2775
2776         }
2777
2778         yaffsfs_Unlock();
2779
2780         return dir;
2781 }
2782
2783 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
2784 {
2785         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2786         struct yaffs_dirent *retVal = NULL;
2787
2788         yaffsfs_Lock();
2789
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)
2798                         {
2799                                 /* this should not happen! */
2800                                 strcpy(dsc->de.d_name,_Y("zz"));
2801                         }
2802                         dsc->de.d_reclen = sizeof(struct yaffs_dirent);
2803                         retVal = &dsc->de;
2804                         yaffsfs_DirAdvance(dsc);
2805                 } else
2806                         retVal = NULL;
2807         } else
2808                 yaffsfs_SetError(-EBADF);
2809
2810         yaffsfs_Unlock();
2811
2812         return retVal;
2813
2814 }
2815
2816
2817 void yaffs_rewinddir(yaffs_DIR *dirp)
2818 {
2819         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2820
2821         yaffsfs_Lock();
2822
2823         yaffsfs_SetDirRewound(dsc);
2824
2825         yaffsfs_Unlock();
2826 }
2827
2828
2829 int yaffs_closedir(yaffs_DIR *dirp)
2830 {
2831         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2832
2833         if(!dsc){
2834                 yaffsfs_SetError(-EFAULT);
2835                 return -1;
2836         }
2837
2838         yaffsfs_Lock();
2839         dsc->magic = 0;
2840         list_del(&dsc->others); /* unhook from list */
2841         kfree(dsc);
2842         yaffsfs_Unlock();
2843         return 0;
2844 }
2845
2846 /* End of directory stuff */
2847
2848
2849 int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath)
2850 {
2851         struct yaffs_obj *parent = NULL;
2852         struct yaffs_obj *obj;
2853         YCHAR *name;
2854         int retVal= -1;
2855         int mode = 0; /* ignore for now */
2856         int notDir = 0;
2857         int loop = 0;
2858
2859         if(!oldpath || !newpath){
2860                 yaffsfs_SetError(-EFAULT);
2861                 return -1;
2862         }
2863
2864         if(yaffsfs_CheckPath(newpath) < 0 ||
2865                 yaffsfs_CheckPath(oldpath) < 0){
2866                 yaffsfs_SetError(-ENAMETOOLONG);
2867                 return -1;
2868         }
2869
2870         yaffsfs_Lock();
2871         parent = yaffsfs_FindDirectory(NULL,newpath,&name,0,&notDir,&loop);
2872         if(!parent && notDir)
2873                 yaffsfs_SetError(-ENOTDIR);
2874         else if(loop)
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);
2880         else if(parent){
2881                 obj = yaffs_create_symlink(parent,name,mode,0,0,oldpath);
2882                 if(obj)
2883                         retVal = 0;
2884                 else if (yaffsfs_FindObject(NULL,newpath,0,0, NULL,NULL,NULL))
2885                         yaffsfs_SetError(-EEXIST);
2886                 else
2887                         yaffsfs_SetError(-ENOSPC);
2888         }
2889
2890         yaffsfs_Unlock();
2891
2892         return retVal;
2893
2894 }
2895
2896 int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz)
2897 {
2898         struct yaffs_obj *obj = NULL;
2899         struct yaffs_obj *dir = NULL;
2900         int retVal= -1;
2901         int notDir = 0;
2902         int loop = 0;
2903
2904         if(!path || !buf){
2905                 yaffsfs_SetError(-EFAULT);
2906                 return -1;
2907         }
2908
2909         yaffsfs_Lock();
2910
2911         obj = yaffsfs_FindObject(NULL,path,0,1, &dir,&notDir,&loop);
2912
2913         if(!dir && notDir)
2914                 yaffsfs_SetError(-ENOTDIR);
2915         else if(loop)
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);
2921         else {
2922                 YCHAR *alias = obj->variant.symlink_variant.alias;
2923                 memset(buf,0,bufsiz);
2924                 strncpy(buf,alias,bufsiz - 1);
2925                 retVal = 0;
2926         }
2927         yaffsfs_Unlock();
2928         return retVal;
2929 }
2930
2931 int yaffs_link(const YCHAR *oldpath, const YCHAR *linkpath)
2932 {
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;
2938         int retVal = -1;
2939         int notDirObj = 0;
2940         int notDirLnk = 0;
2941         int objLoop = 0;
2942         int lnkLoop = 0;
2943         YCHAR *newname;
2944
2945         if(!oldpath || !linkpath){
2946                 yaffsfs_SetError(-EFAULT);
2947                 return -1;
2948         }
2949
2950         if(yaffsfs_CheckPath(linkpath) < 0 ||
2951                 yaffsfs_CheckPath(oldpath) < 0){
2952                 yaffsfs_SetError(-ENAMETOOLONG);
2953                 return -1;
2954         }
2955
2956         yaffsfs_Lock();
2957
2958         obj = yaffsfs_FindObject(NULL,oldpath,0,1,&obj_dir,&notDirObj,&objLoop);
2959         lnk = yaffsfs_FindObject(NULL,linkpath,0,0,NULL,NULL,NULL);
2960         lnk_dir = yaffsfs_FindDirectory(NULL,linkpath,&newname,0,&notDirLnk,&lnkLoop);
2961
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);
2970         else if(lnk)
2971                 yaffsfs_SetError(-EEXIST);
2972         else if(lnk_dir->my_dev != obj->my_dev)
2973                 yaffsfs_SetError(-EXDEV);
2974         else {
2975                 retVal = yaffsfs_CheckNameLength(newname);
2976
2977                 if(retVal == 0) {
2978                         lnk = yaffs_link_obj(lnk_dir,newname,obj);
2979                         if(lnk)
2980                                 retVal = 0;
2981                         else{
2982                                 yaffsfs_SetError(-ENOSPC);
2983                                 retVal = -1;
2984                         }
2985                 }
2986         }
2987         yaffsfs_Unlock();
2988
2989         return retVal;
2990 }
2991
2992 int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev)
2993 {
2994         pathname=pathname;
2995         mode=mode;
2996         dev=dev;
2997
2998         yaffsfs_SetError(-EINVAL);
2999         return -1;
3000 }
3001
3002
3003 /*
3004  * D E B U G   F U N C T I O N S
3005  */
3006
3007 /*
3008  * yaffs_n_handles()
3009  * Returns number of handles attached to the object
3010  */
3011 int yaffs_n_handles(const YCHAR *path)
3012 {
3013         struct yaffs_obj *obj;
3014
3015         if(!path){
3016                 yaffsfs_SetError(-EFAULT);
3017                 return -1;
3018         }
3019
3020         if(yaffsfs_CheckPath(path) < 0){
3021                 yaffsfs_SetError(-ENAMETOOLONG);
3022                 return -1;
3023         }
3024
3025         obj = yaffsfs_FindObject(NULL,path,0,1,NULL,NULL,NULL);
3026
3027         if(obj)
3028                 return yaffsfs_CountHandles(obj);
3029         else
3030                 return -1;
3031 }
3032
3033 int yaffs_get_error(void)
3034 {
3035         return yaffsfs_GetLastError();
3036 }
3037
3038 int yaffs_set_error(int error)
3039 {
3040         yaffsfs_SetError(error);
3041         return 0;
3042 }
3043
3044 int yaffs_dump_dev(const YCHAR *path)
3045 {
3046 #if 1
3047         path=path;
3048 #else
3049         YCHAR *rest;
3050
3051         struct yaffs_obj *obj = yaffsfs_FindRoot(path,&rest);
3052
3053         if(obj){
3054                 struct yaffs_dev *dev = obj->my_dev;
3055
3056                 printf("\n"
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"
3063                            "\n",
3064                                 dev->n_page_writes,
3065                                 dev->n_page_reads,
3066                                 dev->n_erasures,
3067                                 dev->n_gc_copies,
3068                                 dev->garbageCollections,
3069                                 dev->passiveGarbageCollections
3070                 );
3071
3072         }
3073
3074 #endif
3075         return 0;
3076 }
3077