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 handles in yaffsfs_Handle.
  48  *
  49  * Things are structured this way to be like the Linux VFS model
  50  * so that interactions with the yaffs guts calls are similar.
  51  * That means more common code paths and less special code.
  52  * That means better testing etc.
  53  */
  54
  55 typedef struct {
  56         int count;      /* Number of handles accessing this inode */
  57         struct yaffs_obj *iObj;
  58 } yaffsfs_Inode;
  59
  60 typedef struct{
  61         u8      reading:1;
  62         u8      writing:1;
  63         u8      append:1;
  64         u8      shareRead:1;
  65         u8      shareWrite:1;
  66         int     inodeId:12;     /* Index to corresponding yaffsfs_Inode */
  67         int     useCount:10;    /* Use count for this handle */
  68         u32 position;           /* current position in file */
  69 }yaffsfs_Handle;
  70
  71 static yaffsfs_Inode yaffsfs_inode[YAFFSFS_N_HANDLES];
  72 static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
  73 static int yaffsfs_handlesInitialised;
  74
  75
  76 unsigned yaffs_set_trace(unsigned  tm)
  77 {
  78         yaffs_trace_mask = tm;
  79         return yaffs_trace_mask;
  80 }
  81
  82 unsigned yaffs_get_trace(void)
  83 {
  84         return yaffs_trace_mask;
  85 }
  86
  87 /*
  88  * yaffsfs_InitHandle
  89  * Inilitalise handle management on start-up.
  90  */
  91
  92 static void yaffsfs_InitHandles(void)
  93 {
  94         int i;
  95         if(yaffsfs_handlesInitialised)
  96                 return;
  97
  98         memset(yaffsfs_inode,0,sizeof(yaffsfs_inode));
  99         memset(yaffsfs_handle,0,sizeof(yaffsfs_handle));
 100         for(i = 0; i < YAFFSFS_N_HANDLES; i++)
 101                 yaffsfs_handle[i].inodeId = -1;
 102 }
 103
 104 yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
 105 {
 106         if(h < 0 || h >= YAFFSFS_N_HANDLES)
 107                 return NULL;
 108
 109         return &yaffsfs_handle[h];
 110 }
 111
 112 yaffsfs_Inode *yaffsfs_GetInodePointer(int handle)
 113 {
 114         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 115
 116         if(h && h->useCount > 0 && h->inodeId >= 0 && h->inodeId < YAFFSFS_N_HANDLES)
 117                 return  &yaffsfs_inode[h->inodeId];
 118
 119         return NULL;
 120 }
 121
 122 struct yaffs_obj *yaffsfs_GetHandleObject(int handle)
 123 {
 124         yaffsfs_Inode *in = yaffsfs_GetInodePointer(handle);
 125
 126         if(in)
 127                 return in->iObj;
 128
 129         return NULL;
 130 }
 131
 132 /*
 133  * yaffsfs_FindInodeIdForObject
 134  * Find the inode entry for an object, if it exists.
 135  */
 136
 137 static int yaffsfs_FindInodeIdForObject(struct yaffs_obj *obj)
 138 {
 139         int i;
 140         int ret = -1;
 141
 142         if(obj)
 143                 obj = yaffs_get_equivalent_obj(obj);
 144
 145         /* Look for it in open inode table*/
 146         for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
 147                 if(yaffsfs_inode[i].iObj == obj)
 148                         ret = i;
 149         }
 150         return ret;
 151 }
 152
 153 /*
 154  * yaffsfs_GetInodeIdForObject
 155  * Grab an inode entry when opening a new inode.
 156  */
 157 static int yaffsfs_GetInodeIdForObject(struct yaffs_obj *obj)
 158 {
 159         int i;
 160         int ret;
 161         yaffsfs_Inode *in = NULL;
 162
 163         if(obj)
 164                 obj = yaffs_get_equivalent_obj(obj);
 165
 166         ret = yaffsfs_FindInodeIdForObject(obj);
 167
 168         for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
 169                 if(!yaffsfs_inode[i].iObj)
 170                         ret = i;
 171         }
 172
 173         if(ret>=0){
 174                 in = &yaffsfs_inode[ret];
 175                 if(!in->iObj)
 176                         in->count = 0;
 177                 in->iObj = obj;
 178                 in->count++;
 179         }
 180
 181
 182         return ret;
 183 }
 184
 185
 186 static int yaffsfs_CountHandles(struct yaffs_obj *obj)
 187 {
 188         int i = yaffsfs_FindInodeIdForObject(obj);
 189
 190         if(i >= 0)
 191                 return yaffsfs_inode[i].count;
 192         else
 193                 return 0;
 194 }
 195
 196 static void yaffsfs_ReleaseInode(yaffsfs_Inode *in)
 197 {
 198         struct yaffs_obj *obj;
 199
 200         obj = in->iObj;
 201
 202         if(obj->unlinked)
 203                 yaffs_del_obj(obj);
 204
 205         obj->my_inode = NULL;
 206         in->iObj = NULL;
 207
 208 }
 209
 210 static void yaffsfs_PutInode(int inodeId)
 211 {
 212         if(inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES){
 213                 yaffsfs_Inode *in = & yaffsfs_inode[inodeId];
 214                 in->count--;
 215                 if(in->count <= 0){
 216                         yaffsfs_ReleaseInode(in);
 217                         in->count = 0;
 218                 }
 219         }
 220 }
 221
 222
 223 /*
 224  * yaffsfs_GetHandle
 225  * Grab a handle (when opening a file)
 226  */
 227
 228 static int yaffsfs_GetNewHandle(void)
 229 {
 230         int i;
 231         yaffsfs_Handle *h;
 232
 233         for(i = 0; i < YAFFSFS_N_HANDLES; i++){
 234                 h = yaffsfs_GetHandlePointer(i);
 235                 if(!h){
 236                         /* todo bug: should never happen */
 237                 }
 238                 if(h->useCount < 1){
 239                         memset(h,0,sizeof(yaffsfs_Handle));
 240                         h->inodeId=-1;
 241                         h->useCount=1;
 242                         return i;
 243                 }
 244         }
 245         return -1;
 246 }
 247
 248 /*
 249  * yaffs_get_handle
 250  * Increase use of handle when reading/writing a file
 251  */
 252 static int yaffsfs_GetHandle(int handle)
 253 {
 254         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 255
 256         if(h && h->useCount > 0){
 257                 h->useCount++;
 258         }
 259         return 0;
 260 }
 261
 262 /*
 263  * yaffs_put_handle
 264  * Let go of a handle when closing a file or aborting an open or
 265  * ending a read or write.
 266  */
 267 static int yaffsfs_PutHandle(int handle)
 268 {
 269         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 270
 271         if(h && h->useCount > 0){
 272                 h->useCount--;
 273                 if(h->useCount < 1){
 274                         if(h->inodeId >= 0){
 275                                 yaffsfs_PutInode(h->inodeId);
 276                                 h->inodeId = -1;
 277                         }
 278                 }
 279         }
 280         return 0;
 281 }
 282
 283 static void yaffsfs_BreakDeviceHandles(struct yaffs_dev *dev)
 284 {
 285         yaffsfs_Handle *h;
 286         struct yaffs_obj *obj;
 287         int i;
 288         for(i = 0; i < YAFFSFS_N_HANDLES; i++){
 289                 h = yaffsfs_GetHandlePointer(i);
 290                 obj = yaffsfs_GetHandleObject(i);
 291                 if(h && h->useCount>0 && obj && obj->my_dev == dev){
 292                         h->useCount = 0;
 293                         yaffsfs_PutInode(h->inodeId);
 294                         h->inodeId = -1;
 295                 }
 296         }
 297 }
 298
 299
 300
 301
 302 /*
 303  *  Stuff to handle names.
 304  */
 305
 306
 307 int yaffsfs_Match(YCHAR a, YCHAR b)
 308 {
 309         /* case sensitive */
 310         return (a == b);
 311 }
 312
 313 int yaffsfs_IsPathDivider(YCHAR ch)
 314 {
 315         const YCHAR *str = YAFFS_PATH_DIVIDERS;
 316
 317         while(*str){
 318                 if(*str == ch)
 319                         return 1;
 320                 str++;
 321         }
 322
 323         return 0;
 324 }
 325
 326 int yaffsfs_CheckNameLength(const char *name)
 327 {
 328         int retVal = 0;
 329
 330         int nameLength = yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH+1);
 331
 332         if(nameLength == 0){
 333                 yaffsfs_SetError(-ENOENT);
 334                 retVal = -1;
 335         } else if (nameLength > YAFFS_MAX_NAME_LENGTH){
 336                 yaffsfs_SetError(-ENAMETOOLONG);
 337                 retVal = -1;
 338         }
 339
 340         return retVal;
 341 }
 342
 343
 344 static int yaffsfs_alt_dir_path(const YCHAR *path, YCHAR **ret_path)
 345 {
 346         YCHAR *alt_path = NULL;
 347         int path_length;
 348         int i;
 349
 350         /*
 351          * We don't have a definition for max path length.
 352          * We will use 3 * max name length instead.
 353          */
 354         *ret_path = NULL;
 355         path_length = strnlen(path,(YAFFS_MAX_NAME_LENGTH+1)*3 +1);
 356
 357         /* If the last character is a path divider, then we need to
 358          * trim it back so that the name look-up works properly.
 359          * eg. /foo/new_dir/ -> /foo/newdir
 360          * Curveball: Need to handle multiple path dividers:
 361          * eg. /foof/sdfse///// -> /foo/sdfse
 362          */
 363         if(path_length > 0 &&
 364                 yaffsfs_IsPathDivider(path[path_length-1])){
 365                 alt_path = YMALLOC(path_length + 1);
 366                 if(!alt_path)
 367                         return -1;
 368                 strcpy(alt_path, path);
 369                 for(i = path_length-1;
 370                         i >= 0 && yaffsfs_IsPathDivider(alt_path[i]);
 371                         i--)
 372                         alt_path[i] = (YCHAR) 0;
 373         }
 374         *ret_path = alt_path;
 375         return 0;
 376 }
 377
 378
 379 LIST_HEAD(yaffsfs_deviceList);
 380
 381 /*
 382  * yaffsfs_FindDevice
 383  * yaffsfs_FindRoot
 384  * Scan the configuration list to find the device
 385  * Curveballs: Should match paths that end in '/' too
 386  * Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
 387  */
 388 static struct yaffs_dev *yaffsfs_FindDevice(const YCHAR *path, YCHAR **restOfPath)
 389 {
 390         struct list_head *cfg;
 391         const YCHAR *leftOver;
 392         const YCHAR *p;
 393         struct yaffs_dev *retval = NULL;
 394         struct yaffs_dev *dev = NULL;
 395         int thisMatchLength;
 396         int longestMatch = -1;
 397         int matching;
 398
 399         /*
 400          * Check all configs, choose the one that:
 401          * 1) Actually matches a prefix (ie /a amd /abc will not match
 402          * 2) Matches the longest.
 403          */
 404         list_for_each(cfg, &yaffsfs_deviceList){
 405                 dev = list_entry(cfg, struct yaffs_dev, dev_list);
 406                 leftOver = path;
 407                 p = dev->param.name;
 408                 thisMatchLength = 0;
 409                 matching = 1;
 410
 411
 412                 while(matching && *p && *leftOver){
 413                         /* Skip over any /s */
 414                         while(yaffsfs_IsPathDivider(*p))
 415                               p++;
 416
 417                         /* Skip over any /s */
 418                         while(yaffsfs_IsPathDivider(*leftOver))
 419                               leftOver++;
 420
 421                         /* Now match the text part */
 422                         while(matching &&
 423                               *p && !yaffsfs_IsPathDivider(*p) &&
 424                               *leftOver && !yaffsfs_IsPathDivider(*leftOver)){
 425                                 if(yaffsfs_Match(*p,*leftOver)){
 426                                         p++;
 427                                         leftOver++;
 428                                         thisMatchLength++;
 429                                 } else {
 430                                         matching = 0;
 431                                 }
 432                         }
 433                 }
 434
 435                 /* Skip over any /s in leftOver */
 436                 while(yaffsfs_IsPathDivider(*leftOver))
 437                       leftOver++;
 438
 439                 // Skip over any /s in p
 440                 while(yaffsfs_IsPathDivider(*p))
 441                       p++;
 442
 443                 // p should now be at the end of the string (ie. fully matched)
 444                 if(*p)
 445                         matching = 0;
 446
 447                 if( matching && (thisMatchLength > longestMatch))
 448                 {
 449                         // Matched prefix
 450                         *restOfPath = (YCHAR *)leftOver;
 451                         retval = dev;
 452                         longestMatch = thisMatchLength;
 453                 }
 454
 455         }
 456         return retval;
 457 }
 458
 459 static int yaffsfs_CheckPath(const YCHAR *path)
 460 {
 461         int n=0;
 462         int divs=0;
 463         while(*path && n < YAFFS_MAX_NAME_LENGTH && divs < 100){
 464                 if(yaffsfs_IsPathDivider(*path)){
 465                         n=0;
 466                         divs++;
 467                 } else
 468                         n++;
 469                 path++;
 470         }
 471
 472         return (*path) ? -1 : 0;
 473 }
 474
 475 /* FindMountPoint only returns a dev entry if the path is a mount point */
 476 static struct yaffs_dev *yaffsfs_FindMountPoint(const YCHAR *path)
 477 {
 478         struct yaffs_dev *dev;
 479         YCHAR *restOfPath=NULL;
 480         dev = yaffsfs_FindDevice(path,&restOfPath);
 481         if(dev && restOfPath && *restOfPath)
 482                 dev = NULL;
 483         return dev;
 484 }
 485
 486 static struct yaffs_obj *yaffsfs_FindRoot(const YCHAR *path, YCHAR **restOfPath)
 487 {
 488
 489         struct yaffs_dev *dev;
 490
 491         dev= yaffsfs_FindDevice(path,restOfPath);
 492         if(dev && dev->is_mounted){
 493                 return dev->root_dir;
 494         }
 495         return NULL;
 496 }
 497
 498 static struct yaffs_obj *yaffsfs_FollowLink(struct yaffs_obj *obj,
 499                                         int symDepth, int *loop)
 500 {
 501
 502         if(obj)
 503                 obj = yaffs_get_equivalent_obj(obj);
 504
 505         while(obj && obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK){
 506                 YCHAR *alias = obj->variant.symlink_variant.alias;
 507
 508                 if(yaffsfs_IsPathDivider(*alias))
 509                         /* Starts with a /, need to scan from root up */
 510                         obj = yaffsfs_FindObject(NULL,alias,symDepth++,
 511                                                 1,NULL,NULL,loop);
 512                 else
 513                         /* Relative to here, so use the parent of the symlink as a start */
 514                         obj = yaffsfs_FindObject(obj->parent,alias,symDepth++,
 515                                                 1,NULL,NULL,loop);
 516         }
 517         return obj;
 518 }
 519
 520
 521 /*
 522  * yaffsfs_FindDirectory
 523  * Parse a path to determine the directory and the name within the directory.
 524  *
 525  * eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
 526  */
 527 static struct yaffs_obj *yaffsfs_DoFindDirectory(struct yaffs_obj *startDir,
 528                                 const YCHAR *path, YCHAR **name, int symDepth,
 529                                 int *notDir,int *loop)
 530 {
 531         struct yaffs_obj *dir;
 532         YCHAR *restOfPath;
 533         YCHAR str[YAFFS_MAX_NAME_LENGTH+1];
 534         int i;
 535
 536         if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES){
 537                 if(loop)
 538                         *loop = 1;
 539                 return NULL;
 540         }
 541
 542         if(startDir){
 543                 dir = startDir;
 544                 restOfPath = (YCHAR *)path;
 545         }
 546         else
 547                 dir = yaffsfs_FindRoot(path,&restOfPath);
 548
 549
 550         while(dir){
 551                 /*
 552                  * parse off /.
 553                  * curve ball: also throw away surplus '/'
 554                  * eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
 555                  */
 556                 while(yaffsfs_IsPathDivider(*restOfPath))
 557                         restOfPath++; /* get rid of '/' */
 558
 559                 *name = restOfPath;
 560                 i = 0;
 561
 562                 while(*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)){
 563                         if (i < YAFFS_MAX_NAME_LENGTH){
 564                                 str[i] = *restOfPath;
 565                                 str[i+1] = '\0';
 566                                 i++;
 567                         }
 568                         restOfPath++;
 569                 }
 570
 571                 if(!*restOfPath)
 572                         /* got to the end of the string */
 573                         return dir;
 574                 else{
 575                         if(yaffs_strcmp(str,_Y(".")) == 0)
 576                         {
 577                                 /* Do nothing */
 578                         }
 579                         else if(yaffs_strcmp(str,_Y("..")) == 0)
 580                                 dir = dir->parent;
 581                         else{
 582                                 dir = yaffs_find_by_name(dir,str);
 583
 584                                 dir = yaffsfs_FollowLink(dir,symDepth,loop);
 585
 586                                 if(dir && dir->variant_type !=
 587                                         YAFFS_OBJECT_TYPE_DIRECTORY){
 588                                         if(notDir)
 589                                                 *notDir = 1;
 590                                         dir = NULL;
 591                                 }
 592
 593                         }
 594                 }
 595         }
 596         /* directory did not exist. */
 597         return NULL;
 598 }
 599
 600 static struct yaffs_obj *yaffsfs_FindDirectory(struct yaffs_obj *relDir,
 601                                         const YCHAR *path,
 602                                         YCHAR **name,
 603                                         int symDepth,
 604                                         int *notDir,
 605                                         int *loop)
 606 {
 607         return yaffsfs_DoFindDirectory(relDir,path,name,symDepth,notDir,loop);
 608 }
 609
 610 /*
 611  * yaffsfs_FindObject turns a path for an existing object into the object
 612  */
 613 static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relDir,
 614                         const YCHAR *path,int symDepth, int getEquiv,
 615                         struct yaffs_obj **dirOut, int *notDir,int *loop)
 616 {
 617         struct yaffs_obj *dir;
 618         struct yaffs_obj *obj;
 619         YCHAR *name;
 620
 621         dir = yaffsfs_FindDirectory(relDir,path,&name,symDepth,notDir,loop);
 622
 623         if(dirOut)
 624                 *dirOut =  dir;
 625
 626         if(dir && *name)
 627                 obj = yaffs_find_by_name(dir,name);
 628         else
 629                 obj = dir;
 630
 631         if(getEquiv)
 632                 obj = yaffs_get_equivalent_obj(obj);
 633
 634         return obj;
 635 }
 636
 637
 638 /*************************************************************************
 639  *      Start of yaffsfs visible functions.
 640  *************************************************************************/
 641
 642 int yaffs_dup(int fd)
 643 {
 644         int newHandle = -1;
 645         yaffsfs_Handle *oldPtr = NULL;
 646         yaffsfs_Handle *newPtr = NULL;
 647
 648         yaffsfs_Lock();
 649
 650         oldPtr = yaffsfs_GetHandlePointer(fd);
 651         if(oldPtr && oldPtr->useCount > 0)
 652                 newHandle = yaffsfs_GetNewHandle();
 653         if(newHandle >= 0)
 654                 newPtr = yaffsfs_GetHandlePointer(newHandle);
 655
 656         if(newPtr)
 657                 *newPtr = *oldPtr;
 658
 659         yaffsfs_Unlock();
 660
 661         if(!oldPtr)
 662                 yaffsfs_SetError(-EBADF);
 663         else if (!newPtr)
 664                 yaffsfs_SetError(-ENOMEM);
 665
 666         return newHandle;
 667
 668 }
 669
 670
 671
 672 int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int sharing)
 673 {
 674         struct yaffs_obj *obj = NULL;
 675         struct yaffs_obj *dir = NULL;
 676         YCHAR *name;
 677         int handle = -1;
 678         yaffsfs_Handle *yh = NULL;
 679         int openDenied = 0;
 680         int symDepth = 0;
 681         int errorReported = 0;
 682         int rwflags = oflag & ( O_RDWR | O_RDONLY | O_WRONLY);
 683         u8 shareRead = (sharing & YAFFS_SHARE_READ) ?  1 : 0;
 684         u8 shareWrite = (sharing & YAFFS_SHARE_WRITE) ? 1 : 0;
 685         u8 sharedReadAllowed;
 686         u8 sharedWriteAllowed;
 687         u8 alreadyReading;
 688         u8 alreadyWriting;
 689         u8 readRequested;
 690         u8 writeRequested;
 691         int notDir = 0;
 692         int loop = 0;
 693
 694         if(!path) {
 695                 yaffsfs_SetError(-EFAULT);
 696                 return -1;
 697         }
 698
 699         if(yaffsfs_CheckPath(path) < 0){
 700                 yaffsfs_SetError(-ENAMETOOLONG);
 701                 return -1;
 702         }
 703
 704         /* O_EXCL only has meaning if O_CREAT is specified */
 705         if(!(oflag & O_CREAT))
 706                 oflag &= ~(O_EXCL);
 707
 708         /* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
 709         if( (oflag & O_CREAT) & (oflag & O_EXCL))
 710                 oflag &= ~(O_TRUNC);
 711
 712         /* Todo: Are there any more flag combos to sanitise ? */
 713
 714         /* Figure out if reading or writing is requested */
 715
 716         readRequested = (rwflags == O_RDWR || rwflags == O_RDONLY) ? 1 : 0;
 717         writeRequested = (rwflags == O_RDWR || rwflags == O_WRONLY) ? 1 : 0;
 718
 719         yaffsfs_Lock();
 720
 721         handle = yaffsfs_GetNewHandle();
 722
 723         if(handle < 0){
 724                 yaffsfs_SetError(-ENFILE);
 725                 errorReported = 1;
 726         } else {
 727
 728                 yh = yaffsfs_GetHandlePointer(handle);
 729
 730                 /* try to find the exisiting object */
 731                 obj = yaffsfs_FindObject(NULL,path,0,1,NULL,NULL,NULL);
 732
 733                 obj = yaffsfs_FollowLink(obj,symDepth++,&loop);
 734
 735                 if(obj &&
 736                         obj->variant_type != YAFFS_OBJECT_TYPE_FILE &&
 737                         obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
 738                         obj = NULL;
 739
 740
 741                 if(obj){
 742
 743                         /* The file already exists or it might be a directory */
 744
 745                         /* If it is a directory then we can't open it as a file */
 746                         if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
 747                                 openDenied = 1;
 748                                 yaffsfs_SetError(-EISDIR);
 749                                 errorReported = 1;
 750                         }
 751
 752                         /* Open should fail if O_CREAT and O_EXCL are specified since
 753                          * the file exists
 754                          */
 755                         if(!errorReported && (oflag & O_EXCL) && (oflag & O_CREAT)){
 756                                 openDenied = 1;
 757                                 yaffsfs_SetError(-EEXIST);
 758                                 errorReported = 1;
 759                         }
 760
 761                         /* Check file permissions */
 762                         if( readRequested && !(obj->yst_mode & S_IREAD))
 763                                 openDenied = 1;
 764
 765                         if( writeRequested && !(obj->yst_mode & S_IWRITE))
 766                                 openDenied = 1;
 767
 768                         if( !errorReported && writeRequested &&
 769                                 obj->my_dev->read_only){
 770                                 openDenied = 1;
 771                                 yaffsfs_SetError(-EROFS);
 772                                 errorReported = 1;
 773                         }
 774
 775                         if(openDenied && !errorReported ) {
 776                                 /* Error if the file exists but permissions are refused. */
 777                                 yaffsfs_SetError(-EACCES);
 778                                 errorReported = 1;
 779                         }
 780
 781                         /* Check sharing of an existing object. */
 782                         if(!openDenied){
 783                                 yaffsfs_Handle *hx;
 784                                 int i;
 785                                 sharedReadAllowed = 1;
 786                                 sharedWriteAllowed = 1;
 787                                 alreadyReading = 0;
 788                                 alreadyWriting = 0;
 789                                 for( i = 0; i < YAFFSFS_N_HANDLES; i++){
 790                                         hx = &yaffsfs_handle[i];
 791                                         if(hx->useCount > 0 &&
 792                                                 hx->inodeId >= 0 &&
 793                                                 yaffsfs_inode[hx->inodeId].iObj == obj){
 794                                                 if(!hx->shareRead)
 795                                                         sharedReadAllowed = 0;
 796                                                 if(!hx->shareWrite)
 797                                                         sharedWriteAllowed = 0;
 798                                                 if(hx->reading)
 799                                                         alreadyReading = 1;
 800                                                 if(hx->writing)
 801                                                         alreadyWriting = 1;
 802                                         }
 803                                 }
 804
 805
 806
 807                                 if((!sharedReadAllowed && readRequested)||
 808                                         (!shareRead  && alreadyReading) ||
 809                                         (!sharedWriteAllowed && writeRequested) ||
 810                                         (!shareWrite && alreadyWriting)){
 811                                         openDenied = 1;
 812                                         yaffsfs_SetError(-EBUSY);
 813                                         errorReported=1;
 814                                 }
 815                         }
 816
 817                 }
 818
 819                 /* If we could not open an existing object, then let's see if
 820                  * the directory exists. If not, error.
 821                  */
 822                 if(!obj && !errorReported){
 823                         dir = yaffsfs_FindDirectory(NULL,path,&name,0,&notDir,&loop);
 824                         if(!dir && notDir){
 825                                 yaffsfs_SetError(-ENOTDIR);
 826                                 errorReported = 1;
 827                         } else if(loop){
 828                                 yaffsfs_SetError(-ELOOP);
 829                                 errorReported = 1;
 830                         } else  if(!dir){
 831                                 yaffsfs_SetError(-ENOENT);
 832                                 errorReported = 1;
 833                         }
 834                 }
 835
 836                 if(!obj && dir && !errorReported && (oflag & O_CREAT)) {
 837                         /* Let's see if we can create this file if it does not exist. */
 838                         if(dir->my_dev->read_only){
 839                                 yaffsfs_SetError(-EROFS);
 840                                 errorReported = 1;
 841                         } else
 842                                 obj = yaffs_create_file(dir,name,mode,0,0);
 843
 844                         if(!obj && !errorReported){
 845                                 yaffsfs_SetError(-ENOSPC);
 846                                 errorReported = 1;
 847                         }
 848                 }
 849
 850                 if(!obj && dir && !errorReported && !(oflag & O_CREAT)) {
 851                         /* Error if the file does not exist and CREAT is not set. */
 852                         yaffsfs_SetError(-ENOENT);
 853                         errorReported = 1;
 854                 }
 855
 856                 if(obj && !openDenied) {
 857                         int inodeId = yaffsfs_GetInodeIdForObject(obj);
 858
 859                         if(inodeId<0) {
 860                                 /*
 861                                  * Todo: Fix any problem if inodes run out, though that
 862                                  * can't happen if the number of inode items >= number of handles.
 863                                  */
 864                         }
 865
 866                         yh->inodeId = inodeId;
 867                         yh->reading = readRequested;
 868                         yh->writing = writeRequested;
 869                         yh->append =  (oflag & O_APPEND) ? 1 : 0;
 870                         yh->position = 0;
 871                         yh->shareRead = shareRead;
 872                         yh->shareWrite = shareWrite;
 873
 874                         /* Hook inode to object */
 875                         obj->my_inode = (void*) &yaffsfs_inode[inodeId];
 876
 877                         if((oflag & O_TRUNC) && yh->writing)
 878                                 yaffs_resize_file(obj,0);
 879                 } else {
 880                         yaffsfs_PutHandle(handle);
 881                         if(!errorReported)
 882                                 yaffsfs_SetError(0); /* Problem */
 883                         handle = -1;
 884                 }
 885         }
 886
 887         yaffsfs_Unlock();
 888
 889         return handle;
 890 }
 891
 892 int yaffs_open(const YCHAR *path, int oflag, int mode)
 893 {
 894         return yaffs_open_sharing(path, oflag, mode, YAFFS_SHARE_READ | YAFFS_SHARE_WRITE);
 895 }
 896
 897 int yaffs_Dofsync(int fd,int datasync)
 898 {
 899         yaffsfs_Handle *h = NULL;
 900         int retVal = -1;
 901
 902         yaffsfs_Lock();
 903
 904         h = yaffsfs_GetHandlePointer(fd);
 905
 906         if(!h || h->useCount < 1)
 907                 yaffsfs_SetError(-EBADF);
 908         else {
 909                 struct yaffs_obj * obj;
 910                 obj = yaffsfs_inode[h->inodeId].iObj;
 911                 if(obj->my_dev->read_only)
 912                         yaffsfs_SetError(-EROFS);
 913                 else {
 914                         yaffs_flush_file(yaffsfs_inode[h->inodeId].iObj,1,datasync);
 915                         retVal = 0;
 916                 }
 917         }
 918
 919         yaffsfs_Unlock();
 920
 921         return retVal;
 922 }
 923
 924 int yaffs_fsync(int fd)
 925 {
 926         return yaffs_Dofsync(fd,0);
 927 }
 928
 929 int yaffs_flush(int fd)
 930 {
 931         return yaffs_fsync(fd);
 932 }
 933
 934 int yaffs_fdatasync(int fd)
 935 {
 936         return yaffs_Dofsync(fd,1);
 937 }
 938
 939 int yaffs_close(int fd)
 940 {
 941         yaffsfs_Handle *h = NULL;
 942         int retVal = 0;
 943
 944         yaffsfs_Lock();
 945
 946         h = yaffsfs_GetHandlePointer(fd);
 947
 948         if(h && h->useCount > 0) {
 949                 /* clean up */
 950                 yaffs_flush_file(yaffsfs_inode[h->inodeId].iObj,1,0);
 951                 yaffsfs_PutHandle(fd);
 952                 retVal = 0;
 953         } else {
 954                 /* bad handle */
 955                 yaffsfs_SetError(-EBADF);
 956                 retVal = -1;
 957         }
 958
 959         yaffsfs_Unlock();
 960
 961         return retVal;
 962 }
 963
 964
 965
 966 int yaffsfs_do_read(int fd, void *vbuf, unsigned int nbyte, int isPread, int offset)
 967 {
 968         yaffsfs_Handle *h = NULL;
 969         struct yaffs_obj *obj = NULL;
 970         int pos = 0;
 971         int startPos = 0;
 972         int endPos = 0;
 973         int nRead = 0;
 974         int nToRead = 0;
 975         int totalRead = 0;
 976         unsigned int maxRead;
 977         u8 *buf = (u8 *)vbuf;
 978
 979         if(!vbuf){
 980                 yaffsfs_SetError(-EFAULT);
 981                 return -1;
 982         }
 983
 984         yaffsfs_Lock();
 985         h = yaffsfs_GetHandlePointer(fd);
 986         obj = yaffsfs_GetHandleObject(fd);
 987
 988         if(!h || !obj){
 989                 /* bad handle */
 990                 yaffsfs_SetError(-EBADF);
 991                 totalRead = -1;
 992         } else if(!h->reading){
 993                 /* Not a reading handle */
 994                 yaffsfs_SetError(-EINVAL);
 995                 totalRead = -1;
 996         } else if(nbyte > YAFFS_MAX_FILE_SIZE){
 997                 yaffsfs_SetError(-EINVAL);
 998                 totalRead = -1;
 999         } else {
1000                 if(isPread)
1001                         startPos = offset;
1002                 else
1003                         startPos = h->position;
1004
1005                 pos = startPos;
1006
1007                 if(yaffs_get_obj_length(obj) > pos)
1008                         maxRead = yaffs_get_obj_length(obj) - pos;
1009                 else
1010                         maxRead = 0;
1011
1012                 if(nbyte > maxRead)
1013                         nbyte = maxRead;
1014
1015
1016                 yaffsfs_GetHandle(fd);
1017
1018                 endPos = pos + nbyte;
1019
1020                 if(pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
1021                         nbyte > YAFFS_MAX_FILE_SIZE ||
1022                         endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE){
1023                         totalRead = -1;
1024                         nbyte = 0;
1025                 }
1026
1027                 while(nbyte > 0) {
1028                         nToRead = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
1029                         if(nToRead > nbyte)
1030                                 nToRead = nbyte;
1031
1032                         /* Tricky bit...
1033                          * Need to reverify object in case the device was
1034                          * unmounted in another thread.
1035                          */
1036                         obj = yaffsfs_GetHandleObject(fd);
1037                         if(!obj)
1038                                 nRead = 0;
1039                         else
1040                                 nRead = yaffs_file_rd(obj,buf,pos,nToRead);
1041
1042                         if(nRead > 0){
1043                                 totalRead += nRead;
1044                                 pos += nRead;
1045                                 buf += nRead;
1046                         }
1047
1048                         if(nRead == nToRead)
1049                                 nbyte-=nRead;
1050                         else
1051                                 nbyte = 0; /* no more to read */
1052
1053
1054                         if(nbyte > 0){
1055                                 yaffsfs_Unlock();
1056                                 yaffsfs_Lock();
1057                         }
1058
1059                 }
1060
1061                 yaffsfs_PutHandle(fd);
1062
1063                 if(!isPread) {
1064                         if(totalRead >= 0)
1065                                 h->position = startPos + totalRead;
1066                         else
1067                                 yaffsfs_SetError(-EINVAL);
1068                 }
1069
1070         }
1071
1072         yaffsfs_Unlock();
1073
1074         return (totalRead >= 0) ? totalRead : -1;
1075
1076 }
1077
1078 int yaffs_read(int fd, void *buf, unsigned int nbyte)
1079 {
1080         return yaffsfs_do_read(fd, buf, nbyte, 0, 0);
1081 }
1082
1083 int yaffs_pread(int fd, void *buf, unsigned int nbyte, unsigned int offset)
1084 {
1085         return yaffsfs_do_read(fd, buf, nbyte, 1, offset);
1086 }
1087
1088 int yaffsfs_do_write(int fd, const void *vbuf, unsigned int nbyte, int isPwrite, int offset)
1089 {
1090         yaffsfs_Handle *h = NULL;
1091         struct yaffs_obj *obj = NULL;
1092         int pos = 0;
1093         int startPos = 0;
1094         int endPos;
1095         int nWritten = 0;
1096         int totalWritten = 0;
1097         int write_trhrough = 0;
1098         int nToWrite = 0;
1099         const u8 *buf = (const u8 *)vbuf;
1100
1101         if(!vbuf){
1102                 yaffsfs_SetError(-EFAULT);
1103                 return -1;
1104         }
1105
1106         yaffsfs_Lock();
1107         h = yaffsfs_GetHandlePointer(fd);
1108         obj = yaffsfs_GetHandleObject(fd);
1109
1110         if(!h || !obj){
1111                 /* bad handle */
1112                 yaffsfs_SetError(-EBADF);
1113                 totalWritten = -1;
1114         } else if(!h->writing){
1115                 yaffsfs_SetError(-EINVAL);
1116                 totalWritten=-1;
1117         } else if(obj->my_dev->read_only){
1118                 yaffsfs_SetError(-EROFS);
1119                 totalWritten=-1;
1120         } else {
1121                 if(h->append)
1122                         startPos = yaffs_get_obj_length(obj);
1123                 else if(isPwrite)
1124                         startPos = offset;
1125                 else
1126                         startPos = h->position;
1127
1128                 yaffsfs_GetHandle(fd);
1129                 pos = startPos;
1130                 endPos = pos + nbyte;
1131
1132                 if(pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
1133                         nbyte > YAFFS_MAX_FILE_SIZE ||
1134                         endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE){
1135                         totalWritten = -1;
1136                         nbyte = 0;
1137                 }
1138
1139                 while(nbyte > 0) {
1140
1141                         nToWrite = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
1142                         if(nToWrite > nbyte)
1143                                 nToWrite = nbyte;
1144
1145                         /* Tricky bit...
1146                          * Need to reverify object in case the device was
1147                          * remounted or unmounted in another thread.
1148                          */
1149                         obj = yaffsfs_GetHandleObject(fd);
1150                         if(!obj || obj->my_dev->read_only)
1151                                 nWritten = 0;
1152                         else
1153                                 nWritten = yaffs_wr_file(obj,buf,pos,nToWrite,
1154                                                         write_trhrough);
1155                         if(nWritten > 0){
1156                                 totalWritten += nWritten;
1157                                 pos += nWritten;
1158                                 buf += nWritten;
1159                         }
1160
1161                         if(nWritten == nToWrite)
1162                                 nbyte -= nToWrite;
1163                         else
1164                                 nbyte = 0;
1165
1166                         if(nWritten < 1 && totalWritten < 1){
1167                                 yaffsfs_SetError(-ENOSPC);
1168                                 totalWritten = -1;
1169                         }
1170
1171                         if(nbyte > 0){
1172                                 yaffsfs_Unlock();
1173                                 yaffsfs_Lock();
1174                         }
1175                 }
1176
1177                 yaffsfs_PutHandle(fd);
1178
1179                 if(!isPwrite){
1180                         if(totalWritten > 0)
1181                                 h->position = startPos + totalWritten;
1182                         else
1183                                 yaffsfs_SetError(-EINVAL);
1184                 }
1185         }
1186
1187         yaffsfs_Unlock();
1188
1189         return (totalWritten >= 0) ? totalWritten : -1;
1190 }
1191
1192 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
1193 {
1194         return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
1195 }
1196
1197 int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, unsigned int offset)
1198 {
1199         return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
1200 }
1201
1202
1203 int yaffs_truncate(const YCHAR *path,off_t new_size)
1204 {
1205         struct yaffs_obj *obj = NULL;
1206         struct yaffs_obj *dir = NULL;
1207         int result = YAFFS_FAIL;
1208         int notDir = 0;
1209         int loop = 0;
1210
1211         if(!path){
1212                 yaffsfs_SetError(-EFAULT);
1213                 return -1;
1214         }
1215
1216         if(yaffsfs_CheckPath(path) < 0){
1217                 yaffsfs_SetError(-ENAMETOOLONG);
1218                 return -1;
1219         }
1220
1221         yaffsfs_Lock();
1222
1223         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1224         obj = yaffsfs_FollowLink(obj,0,&loop);
1225
1226         if(!dir && notDir)
1227                 yaffsfs_SetError(-ENOTDIR);
1228         else if(loop)
1229                 yaffsfs_SetError(-ELOOP);
1230         else if(!dir || !obj)
1231                 yaffsfs_SetError(-ENOENT);
1232         else if(obj->my_dev->read_only)
1233                 yaffsfs_SetError(-EROFS);
1234         else if(obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
1235                 yaffsfs_SetError(-EISDIR);
1236         else if(obj->my_dev->read_only)
1237                 yaffsfs_SetError(-EROFS);
1238         else if(new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
1239                 yaffsfs_SetError(-EINVAL);
1240         else
1241                 result = yaffs_resize_file(obj,new_size);
1242
1243         yaffsfs_Unlock();
1244
1245         return (result) ? 0 : -1;
1246 }
1247
1248 int yaffs_ftruncate(int fd, off_t new_size)
1249 {
1250         yaffsfs_Handle *h = NULL;
1251         struct yaffs_obj *obj = NULL;
1252         int result = 0;
1253
1254         yaffsfs_Lock();
1255         h = yaffsfs_GetHandlePointer(fd);
1256         obj = yaffsfs_GetHandleObject(fd);
1257
1258         if(!h || !obj)
1259                 /* bad handle */
1260                 yaffsfs_SetError(-EBADF);
1261         else if(!h->writing)
1262                 yaffsfs_SetError(-EINVAL);
1263         else if(obj->my_dev->read_only)
1264                 yaffsfs_SetError(-EROFS);
1265         else if( new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
1266                 yaffsfs_SetError(-EINVAL);
1267         else
1268                 /* resize the file */
1269                 result = yaffs_resize_file(obj,new_size);
1270         yaffsfs_Unlock();
1271
1272         return (result) ? 0 : -1;
1273
1274 }
1275
1276 off_t yaffs_lseek(int fd, off_t offset, int whence)
1277 {
1278         yaffsfs_Handle *h = NULL;
1279         struct yaffs_obj *obj = NULL;
1280         int pos = -1;
1281         int fSize = -1;
1282
1283         yaffsfs_Lock();
1284         h = yaffsfs_GetHandlePointer(fd);
1285         obj = yaffsfs_GetHandleObject(fd);
1286
1287         if(!h || !obj)
1288                 yaffsfs_SetError(-EBADF);
1289         else if(offset > YAFFS_MAX_FILE_SIZE)
1290                 yaffsfs_SetError(-EINVAL);
1291         else {
1292                 if(whence == SEEK_SET){
1293                         if(offset >= 0)
1294                                 pos = offset;
1295                 } else if(whence == SEEK_CUR) {
1296                         if( (h->position + offset) >= 0)
1297                                 pos = (h->position + offset);
1298                 } else if(whence == SEEK_END) {
1299                         fSize = yaffs_get_obj_length(obj);
1300                         if(fSize >= 0 && (fSize + offset) >= 0)
1301                                 pos = fSize + offset;
1302                 }
1303
1304                 if(pos >= 0 && pos <= YAFFS_MAX_FILE_SIZE)
1305                         h->position = pos;
1306                 else{
1307                         yaffsfs_SetError(-EINVAL);
1308                         pos = -1;
1309                 }
1310         }
1311
1312         yaffsfs_Unlock();
1313
1314         return pos;
1315 }
1316
1317
1318 int yaffsfs_DoUnlink(const YCHAR *path,int isDirectory)
1319 {
1320         struct yaffs_obj *dir = NULL;
1321         struct yaffs_obj *obj = NULL;
1322         YCHAR *name;
1323         int result = YAFFS_FAIL;
1324         int notDir = 0;
1325         int loop = 0;
1326
1327         if(!path){
1328                 yaffsfs_SetError(-EFAULT);
1329                 return -1;
1330         }
1331
1332         if(yaffsfs_CheckPath(path) < 0){
1333                 yaffsfs_SetError(-ENAMETOOLONG);
1334                 return -1;
1335         }
1336
1337         yaffsfs_Lock();
1338
1339         obj = yaffsfs_FindObject(NULL,path,0,0,NULL,NULL,NULL);
1340         dir = yaffsfs_FindDirectory(NULL,path,&name,0,&notDir,&loop);
1341
1342         if(!dir && notDir)
1343                 yaffsfs_SetError(-ENOTDIR);
1344         else if(loop)
1345                 yaffsfs_SetError(-ELOOP);
1346         else if(!dir)
1347                 yaffsfs_SetError(-ENOENT);
1348         else if(yaffs_strncmp(name,_Y("."),2) == 0)
1349                 yaffsfs_SetError(-EINVAL);
1350         else if(!obj)
1351                 yaffsfs_SetError(-ENOENT);
1352         else if(obj->my_dev->read_only)
1353                 yaffsfs_SetError(-EROFS);
1354         else if(!isDirectory && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
1355                 yaffsfs_SetError(-EISDIR);
1356         else if(isDirectory && obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1357                 yaffsfs_SetError(-ENOTDIR);
1358         else if(isDirectory && obj == obj->my_dev->root_dir)
1359                 yaffsfs_SetError(-EBUSY); /* Can't rmdir a root */
1360         else {
1361                 result = yaffs_unlinker(dir,name);
1362
1363                 if(result == YAFFS_FAIL && isDirectory)
1364                         yaffsfs_SetError(-ENOTEMPTY);
1365         }
1366
1367         yaffsfs_Unlock();
1368
1369         return (result == YAFFS_FAIL) ? -1 : 0;
1370 }
1371
1372
1373 int yaffs_unlink(const YCHAR *path)
1374 {
1375         return yaffsfs_DoUnlink(path,0);
1376 }
1377
1378 int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
1379 {
1380         struct yaffs_obj *olddir = NULL;
1381         struct yaffs_obj *newdir = NULL;
1382         struct yaffs_obj *obj = NULL;
1383         struct yaffs_obj *newobj = NULL;
1384         YCHAR *oldname;
1385         YCHAR *newname;
1386         int result= YAFFS_FAIL;
1387         int rename_allowed = 1;
1388         int notOldDir = 0;
1389         int notNewDir = 0;
1390         int oldLoop = 0;
1391         int newLoop = 0;
1392
1393         YCHAR *alt_newpath=NULL;
1394
1395         if(!oldPath || !newPath){
1396                 yaffsfs_SetError(-EFAULT);
1397                 return -1;
1398         }
1399
1400         if(yaffsfs_CheckPath(newPath) < 0){
1401                 yaffsfs_SetError(-ENAMETOOLONG);
1402                 return -1;
1403         }
1404
1405         if(yaffsfs_alt_dir_path(newPath, &alt_newpath) < 0){
1406                 yaffsfs_SetError(-ENOMEM);
1407                 return -1;
1408         }
1409         if(alt_newpath)
1410                 newPath = alt_newpath;
1411
1412         yaffsfs_Lock();
1413
1414
1415         olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0,&notOldDir,&oldLoop);
1416         newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0,&notNewDir,&newLoop);
1417         obj = yaffsfs_FindObject(NULL,oldPath,0,0,NULL,NULL,NULL);
1418         newobj = yaffsfs_FindObject(NULL,newPath,0,0,NULL,NULL,NULL);
1419
1420         /* If the object being renamed is a directory and the
1421          * path ended with a "/" then the olddir == obj.
1422          * We pass through NULL for the old name to tell the lower layers
1423          * to use olddir as the object.
1424          */
1425
1426         if(olddir == obj)
1427                 oldname = NULL;
1428
1429         if((!olddir && notOldDir) || (!newdir && notNewDir)) {
1430                 yaffsfs_SetError(-ENOTDIR);
1431                 rename_allowed = 0;
1432         } else if(oldLoop || newLoop) {
1433                 yaffsfs_SetError(-ELOOP);
1434                 rename_allowed = 0;
1435         } else if (olddir && oldname && yaffs_strncmp(oldname, _Y("."),2) == 0){
1436                 yaffsfs_SetError(-EINVAL);
1437                 rename_allowed = 0;
1438         }else if(!olddir || !newdir || !obj) {
1439                 yaffsfs_SetError(-ENOENT);
1440                 rename_allowed = 0;
1441         } else if(obj->my_dev->read_only){
1442                 yaffsfs_SetError(-EROFS);
1443                 rename_allowed = 0;
1444         } else if(yaffs_is_non_empty_dir(newobj)){
1445                 yaffsfs_SetError(-ENOTEMPTY);
1446                 rename_allowed = 0;
1447         } else if(olddir->my_dev != newdir->my_dev) {
1448                 /* Rename must be on same device */
1449                 yaffsfs_SetError(-EXDEV);
1450                 rename_allowed = 0;
1451         } else if(obj && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
1452                 /*
1453                  * It is a directory, check that it is not being renamed to
1454                  * being its own decendent.
1455                  * Do this by tracing from the new directory back to the root,
1456                  * checking for obj
1457                  */
1458
1459                 struct yaffs_obj *xx = newdir;
1460
1461                 while( rename_allowed && xx){
1462                         if(xx == obj)
1463                                 rename_allowed = 0;
1464                         xx = xx->parent;
1465                 }
1466                 if(!rename_allowed)
1467                         yaffsfs_SetError(-EINVAL);
1468         }
1469
1470         if(rename_allowed)
1471                 result = yaffs_rename_obj(olddir,oldname,newdir,newname);
1472
1473         yaffsfs_Unlock();
1474
1475         if(alt_newpath)
1476                 YFREE(alt_newpath);
1477
1478         return (result == YAFFS_FAIL) ? -1 : 0;
1479 }
1480
1481
1482 static int yaffsfs_DoStat(struct yaffs_obj *obj,struct yaffs_stat *buf)
1483 {
1484         int retVal = -1;
1485
1486         obj = yaffs_get_equivalent_obj(obj);
1487
1488         if(obj && buf){
1489                 buf->st_dev = (int)obj->my_dev->os_context;
1490                 buf->st_ino = obj->obj_id;
1491                 buf->st_mode = obj->yst_mode & ~S_IFMT; /* clear out file type bits */
1492
1493                 if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
1494                         buf->st_mode |= S_IFDIR;
1495                 else if(obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
1496                         buf->st_mode |= S_IFLNK;
1497                 else if(obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
1498                         buf->st_mode |= S_IFREG;
1499
1500                 buf->st_nlink = yaffs_get_obj_link_count(obj);
1501                 buf->st_uid = 0;
1502                 buf->st_gid = 0;;
1503                 buf->st_rdev = obj->yst_rdev;
1504                 buf->st_size = yaffs_get_obj_length(obj);
1505                 buf->st_blksize = obj->my_dev->data_bytes_per_chunk;
1506                 buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
1507 #if CONFIG_YAFFS_WINCE
1508                 buf->yst_wince_atime[0] = obj->win_atime[0];
1509                 buf->yst_wince_atime[1] = obj->win_atime[1];
1510                 buf->yst_wince_ctime[0] = obj->win_ctime[0];
1511                 buf->yst_wince_ctime[1] = obj->win_ctime[1];
1512                 buf->yst_wince_mtime[0] = obj->win_mtime[0];
1513                 buf->yst_wince_mtime[1] = obj->win_mtime[1];
1514 #else
1515                 buf->yst_atime = obj->yst_atime;
1516                 buf->yst_ctime = obj->yst_ctime;
1517                 buf->yst_mtime = obj->yst_mtime;
1518 #endif
1519                 retVal = 0;
1520         }
1521         return retVal;
1522 }
1523
1524 static int yaffsfs_DoStatOrLStat(const YCHAR *path, struct yaffs_stat *buf,int doLStat)
1525 {
1526         struct yaffs_obj *obj=NULL;
1527         struct yaffs_obj *dir=NULL;
1528         int retVal = -1;
1529         int notDir = 0;
1530         int loop = 0;
1531
1532         if(!path || !buf){
1533                 yaffsfs_SetError(-EFAULT);
1534                 return -1;
1535         }
1536
1537         if(yaffsfs_CheckPath(path) < 0){
1538                 yaffsfs_SetError(-ENAMETOOLONG);
1539                 return -1;
1540         }
1541
1542         yaffsfs_Lock();
1543
1544         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1545
1546         if(!doLStat && obj)
1547                 obj = yaffsfs_FollowLink(obj,0,&loop);
1548
1549         if(!dir && notDir)
1550                 yaffsfs_SetError(-ENOTDIR);
1551         else if(loop)
1552                 yaffsfs_SetError(-ELOOP);
1553         else if(!dir || !obj)
1554                 yaffsfs_SetError(-ENOENT);
1555         else
1556                 retVal = yaffsfs_DoStat(obj,buf);
1557
1558         yaffsfs_Unlock();
1559
1560         return retVal;
1561
1562 }
1563
1564 int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
1565 {
1566         return yaffsfs_DoStatOrLStat(path,buf,0);
1567 }
1568
1569 int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
1570 {
1571         return yaffsfs_DoStatOrLStat(path,buf,1);
1572 }
1573
1574 int yaffs_fstat(int fd, struct yaffs_stat *buf)
1575 {
1576         struct yaffs_obj *obj;
1577
1578         int retVal = -1;
1579
1580         if(!buf){
1581                 yaffsfs_SetError(-EFAULT);
1582                 return -1;
1583         }
1584
1585         yaffsfs_Lock();
1586         obj = yaffsfs_GetHandleObject(fd);
1587
1588         if(obj)
1589                 retVal = yaffsfs_DoStat(obj,buf);
1590         else
1591                 /* bad handle */
1592                 yaffsfs_SetError(-EBADF);
1593
1594         yaffsfs_Unlock();
1595
1596         return retVal;
1597 }
1598
1599 #ifndef CONFIG_YAFFS_WINCE
1600 /* xattrib functions */
1601
1602
1603 static int yaffs_do_setxattr(const YCHAR *path, const char *name,
1604                         const void *data, int size, int flags, int follow)
1605 {
1606         struct yaffs_obj *obj;
1607         struct yaffs_obj *dir;
1608         int notDir = 0;
1609         int loop = 0;
1610
1611         int retVal = -1;
1612
1613         if(!path || !name || !data){
1614                 yaffsfs_SetError(-EFAULT);
1615                 return -1;
1616         }
1617
1618         if(yaffsfs_CheckPath(path) < 0){
1619                 yaffsfs_SetError(-ENAMETOOLONG);
1620                 return -1;
1621         }
1622
1623         yaffsfs_Lock();
1624
1625         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1626
1627         if(follow)
1628                 obj = yaffsfs_FollowLink(obj,0,&loop);
1629
1630         if(!dir && notDir)
1631                 yaffsfs_SetError(-ENOTDIR);
1632         else if(loop)
1633                 yaffsfs_SetError(-ELOOP);
1634         else if(!dir || !obj)
1635                 yaffsfs_SetError(-ENOENT);
1636         else {
1637                 retVal = yaffs_set_xattrib(obj,name,data,size,flags);
1638                 if(retVal< 0){
1639                         yaffsfs_SetError(retVal);
1640                         retVal = -1;
1641                 }
1642         }
1643
1644         yaffsfs_Unlock();
1645
1646         return retVal;
1647
1648 }
1649
1650 int yaffs_setxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1651 {
1652         return yaffs_do_setxattr(path, name, data, size, flags, 1);
1653 }
1654
1655 int yaffs_lsetxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1656 {
1657         return yaffs_do_setxattr(path, name, data, size, flags, 0);
1658 }
1659
1660
1661
1662 int yaffs_fsetxattr(int fd, const char *name, const void *data, int size, int flags)
1663 {
1664         struct yaffs_obj *obj;
1665
1666         int retVal = -1;
1667
1668         if(!name || !data){
1669                 yaffsfs_SetError(-EFAULT);
1670                 return -1;
1671         }
1672
1673         yaffsfs_Lock();
1674         obj = yaffsfs_GetHandleObject(fd);
1675
1676         if(!obj)
1677                 yaffsfs_SetError(-EBADF);
1678         else {
1679                 retVal = yaffs_set_xattrib(obj,name,data,size,flags);
1680                 if(retVal< 0){
1681                         yaffsfs_SetError(retVal);
1682                         retVal = -1;
1683                 }
1684         }
1685
1686         yaffsfs_Unlock();
1687
1688         return retVal;
1689 }
1690
1691 static int yaffs_do_getxattr(const YCHAR *path, const char *name, void *data, int size, int follow)
1692 {
1693         struct yaffs_obj *obj;
1694         struct yaffs_obj *dir;
1695         int retVal = -1;
1696         int notDir = 0;
1697         int loop = 0;
1698
1699         if(!path || !name || !data ){
1700                 yaffsfs_SetError(-EFAULT);
1701                 return -1;
1702         }
1703
1704         if(yaffsfs_CheckPath(path) < 0){
1705                 yaffsfs_SetError(-ENAMETOOLONG);
1706                 return -1;
1707         }
1708
1709         yaffsfs_Lock();
1710
1711         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1712
1713         if(follow)
1714                 obj = yaffsfs_FollowLink(obj,0,&loop);
1715
1716         if(!dir && notDir)
1717                 yaffsfs_SetError(-ENOTDIR);
1718         else if(loop)
1719                 yaffsfs_SetError(-ELOOP);
1720         else if(!dir || !obj)
1721                 yaffsfs_SetError(-ENOENT);
1722         else {
1723                 retVal = yaffs_get_xattrib(obj,name,data,size);
1724                 if(retVal< 0){
1725                         yaffsfs_SetError(retVal);
1726                         retVal = -1;
1727                 }
1728         }
1729         yaffsfs_Unlock();
1730
1731         return retVal;
1732
1733 }
1734
1735 int yaffs_getxattr(const YCHAR *path, const char *name, void *data, int size)
1736 {
1737         return yaffs_do_getxattr( path, name, data, size, 1);
1738 }
1739 int yaffs_lgetxattr(const YCHAR *path, const char *name, void *data, int size)
1740 {
1741         return yaffs_do_getxattr( path, name, data, size, 0);
1742 }
1743
1744
1745
1746 int yaffs_fgetxattr(int fd, const char *name, void *data, int size)
1747 {
1748         struct yaffs_obj *obj;
1749
1750         int retVal = -1;
1751
1752         if(!name || !data ){
1753                 yaffsfs_SetError(-EFAULT);
1754                 return -1;
1755         }
1756
1757         yaffsfs_Lock();
1758         obj = yaffsfs_GetHandleObject(fd);
1759
1760         if(obj) {
1761                 retVal = yaffs_get_xattrib(obj,name,data,size);
1762                 if(retVal< 0){
1763                         yaffsfs_SetError(retVal);
1764                         retVal = -1;
1765                 }
1766         } else
1767                 /* bad handle */
1768                 yaffsfs_SetError(-EBADF);
1769
1770         yaffsfs_Unlock();
1771
1772         return retVal;
1773 }
1774
1775 static int yaffs_do_listxattr(const YCHAR *path, char *data, int size, int follow)
1776 {
1777         struct yaffs_obj *obj=NULL;
1778         struct yaffs_obj *dir=NULL;
1779         int retVal = -1;
1780         int notDir = 0;
1781         int loop = 0;
1782
1783         if(!path || !data ){
1784                 yaffsfs_SetError(-EFAULT);
1785                 return -1;
1786         }
1787
1788         if(yaffsfs_CheckPath(path) < 0){
1789                 yaffsfs_SetError(-ENAMETOOLONG);
1790                 return -1;
1791         }
1792
1793         yaffsfs_Lock();
1794
1795         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1796
1797         if(follow)
1798                 obj = yaffsfs_FollowLink(obj,0,&loop);
1799
1800         if(!dir && notDir)
1801                 yaffsfs_SetError(-ENOTDIR);
1802         else if(loop)
1803                 yaffsfs_SetError(-ELOOP);
1804         else if(!dir || !obj)
1805                 yaffsfs_SetError(-ENOENT);
1806         else {
1807                 retVal = yaffs_list_xattrib(obj, data,size);
1808                 if(retVal< 0){
1809                         yaffsfs_SetError(retVal);
1810                         retVal = -1;
1811                 }
1812         }
1813
1814         yaffsfs_Unlock();
1815
1816         return retVal;
1817
1818 }
1819
1820 int yaffs_listxattr(const YCHAR *path, char *data, int size)
1821 {
1822         return yaffs_do_listxattr(path, data, size, 1);
1823 }
1824
1825 int yaffs_llistxattr(const YCHAR *path, char *data, int size)
1826 {
1827         return yaffs_do_listxattr(path, data, size, 0);
1828 }
1829
1830 int yaffs_flistxattr(int fd, char *data, int size)
1831 {
1832         struct yaffs_obj *obj;
1833
1834         int retVal = -1;
1835
1836         if(!data ){
1837                 yaffsfs_SetError(-EFAULT);
1838                 return -1;
1839         }
1840
1841         yaffsfs_Lock();
1842         obj = yaffsfs_GetHandleObject(fd);
1843
1844         if(obj) {
1845                 retVal = yaffs_list_xattrib(obj,data,size);
1846                 if(retVal< 0){
1847                         yaffsfs_SetError(retVal);
1848                         retVal = -1;
1849                 }
1850         } else
1851                 /* bad handle */
1852                 yaffsfs_SetError(-EBADF);
1853
1854         yaffsfs_Unlock();
1855
1856         return retVal;
1857 }
1858
1859 static int yaffs_do_removexattr(const YCHAR *path, const char *name, int follow)
1860 {
1861         struct yaffs_obj *obj=NULL;
1862         struct yaffs_obj *dir=NULL;
1863         int notDir = 0;
1864         int loop = 0;
1865         int retVal = -1;
1866
1867         if(!path || !name){
1868                 yaffsfs_SetError(-EFAULT);
1869                 return -1;
1870         }
1871
1872         if(yaffsfs_CheckPath(path) < 0){
1873                 yaffsfs_SetError(-ENAMETOOLONG);
1874                 return -1;
1875         }
1876
1877         yaffsfs_Lock();
1878
1879         obj = yaffsfs_FindObject(NULL,path,0,1, &dir,&notDir,&loop);
1880
1881         if(follow)
1882                 obj = yaffsfs_FollowLink(obj,0,&loop);
1883
1884         if(!dir && notDir)
1885                 yaffsfs_SetError(-ENOTDIR);
1886         else if(loop)
1887                 yaffsfs_SetError(-ELOOP);
1888         else if(!dir || !obj)
1889                 yaffsfs_SetError(-ENOENT);
1890         else {
1891                 retVal = yaffs_remove_xattrib(obj,name);
1892                 if(retVal< 0){
1893                         yaffsfs_SetError(retVal);
1894                         retVal = -1;
1895                 }
1896         }
1897
1898         yaffsfs_Unlock();
1899
1900         return retVal;
1901
1902 }
1903
1904 int yaffs_removexattr(const YCHAR *path, const char *name)
1905 {
1906         return yaffs_do_removexattr(path, name, 1);
1907 }
1908
1909 int yaffs_lremovexattr(const YCHAR *path, const char *name)
1910 {
1911         return yaffs_do_removexattr(path, name, 0);
1912 }
1913
1914 int yaffs_fremovexattr(int fd, const char *name)
1915 {
1916         struct yaffs_obj *obj;
1917
1918         int retVal = -1;
1919
1920         if(!name){
1921                 yaffsfs_SetError(-EFAULT);
1922                 return -1;
1923         }
1924
1925         yaffsfs_Lock();
1926         obj = yaffsfs_GetHandleObject(fd);
1927
1928         if(obj){
1929                 retVal = yaffs_remove_xattrib(obj,name);
1930                 if(retVal< 0){
1931                         yaffsfs_SetError(retVal);
1932                         retVal = -1;
1933                 }
1934         }else
1935                 /* bad handle */
1936                 yaffsfs_SetError(-EBADF);
1937
1938         yaffsfs_Unlock();
1939
1940         return retVal;
1941 }
1942 #endif
1943
1944 #ifdef CONFIG_YAFFS_WINCE
1945 int yaffs_get_wince_times(int fd, unsigned *wctime, unsigned *watime, unsigned *wmtime)
1946 {
1947         struct yaffs_obj *obj;
1948
1949         int retVal = -1;
1950
1951         yaffsfs_Lock();
1952         obj = yaffsfs_GetHandleObject(fd);
1953
1954         if(obj){
1955
1956                 if(wctime){
1957                         wctime[0] = obj->win_ctime[0];
1958                         wctime[1] = obj->win_ctime[1];
1959                 }
1960                 if(watime){
1961                         watime[0] = obj->win_atime[0];
1962                         watime[1] = obj->win_atime[1];
1963                 }
1964                 if(wmtime){
1965                         wmtime[0] = obj->win_mtime[0];
1966                         wmtime[1] = obj->win_mtime[1];
1967                 }
1968
1969
1970                 retVal = 0;
1971         } else
1972                 /*  bad handle */
1973                 yaffsfs_SetError(-EBADF);
1974
1975         yaffsfs_Unlock();
1976
1977         return retVal;
1978 }
1979
1980
1981 int yaffs_set_wince_times(int fd,
1982                                                   const unsigned *wctime,
1983                                                   const unsigned *watime,
1984                                                   const unsigned *wmtime)
1985 {
1986         struct yaffs_obj *obj;
1987         int result;
1988         int retVal = -1;
1989
1990         yaffsfs_Lock();
1991         obj = yaffsfs_GetHandleObject(fd);
1992
1993         if(obj){
1994
1995                 if(wctime){
1996                         obj->win_ctime[0] = wctime[0];
1997                         obj->win_ctime[1] = wctime[1];
1998                 }
1999                 if(watime){
2000                         obj->win_atime[0] = watime[0];
2001                         obj->win_atime[1] = watime[1];
2002                 }
2003                 if(wmtime){
2004                         obj->win_mtime[0] = wmtime[0];
2005                         obj->win_mtime[1] = wmtime[1];
2006                 }
2007
2008                 obj->dirty = 1;
2009                 result = yaffs_flush_file(obj,0,0);
2010                 retVal = 0;
2011         } else
2012                 /* bad handle */
2013                 yaffsfs_SetError(-EBADF);
2014
2015         yaffsfs_Unlock();
2016
2017         return retVal;
2018 }
2019
2020 #endif
2021
2022
2023 static int yaffsfs_DoChMod(struct yaffs_obj *obj,mode_t mode)
2024 {
2025         int result = -1;
2026
2027         if(obj)
2028                 obj = yaffs_get_equivalent_obj(obj);
2029
2030         if(obj) {
2031                 obj->yst_mode = mode;
2032                 obj->dirty = 1;
2033                 result = yaffs_flush_file(obj,0,0);
2034         }
2035
2036         return result == YAFFS_OK ? 0 : -1;
2037 }
2038
2039
2040 int yaffs_access(const YCHAR *path, int amode)
2041 {
2042         struct yaffs_obj *obj=NULL;
2043         struct yaffs_obj *dir=NULL;
2044         int notDir = 0;
2045         int loop = 0;
2046         int retval = -1;
2047
2048         if(!path){
2049                 yaffsfs_SetError(-EFAULT);
2050                 return -1;
2051         }
2052
2053         if(yaffsfs_CheckPath(path) < 0){
2054                 yaffsfs_SetError(-ENAMETOOLONG);
2055                 return -1;
2056         }
2057
2058         if(amode & ~(R_OK | W_OK | X_OK)){
2059                 yaffsfs_SetError(-EINVAL);
2060                 return -1;
2061         }
2062
2063         yaffsfs_Lock();
2064
2065         obj = yaffsfs_FindObject(NULL,path,0,1, &dir,&notDir,&loop);
2066         obj = yaffsfs_FollowLink(obj,0,&loop);
2067
2068         if(!dir && notDir)
2069                 yaffsfs_SetError(-ENOTDIR);
2070         else if(loop)
2071                 yaffsfs_SetError(-ELOOP);
2072         else if(!dir || !obj)
2073                 yaffsfs_SetError(-ENOENT);
2074         else if((amode & W_OK) && obj->my_dev->read_only)
2075                 yaffsfs_SetError(-EROFS);
2076         else{
2077                 int access_ok = 1;
2078
2079                 if((amode & R_OK) && !(obj->yst_mode & S_IREAD))
2080                         access_ok = 0;
2081                 if((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
2082                         access_ok = 0;
2083                 if((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
2084                         access_ok = 0;
2085
2086                 if(!access_ok)
2087                         yaffsfs_SetError(-EACCES);
2088                 else
2089                         retval = 0;
2090         }
2091
2092         yaffsfs_Unlock();
2093
2094         return retval;
2095
2096 }
2097
2098
2099 int yaffs_chmod(const YCHAR *path, mode_t mode)
2100 {
2101         struct yaffs_obj *obj=NULL;
2102         struct yaffs_obj *dir=NULL;
2103         int retVal = -1;
2104         int notDir = 0;
2105         int loop = 0;
2106
2107         if(!path){
2108                 yaffsfs_SetError(-EFAULT);
2109                 return -1;
2110         }
2111
2112         if(yaffsfs_CheckPath(path) < 0){
2113                 yaffsfs_SetError(-ENAMETOOLONG);
2114                 return -1;
2115         }
2116
2117         if(mode & ~(0777)){
2118                 yaffsfs_SetError(-EINVAL);
2119                 return -1;
2120         }
2121
2122         yaffsfs_Lock();
2123
2124         obj = yaffsfs_FindObject(NULL,path,0,1, &dir, &notDir,&loop);
2125         obj = yaffsfs_FollowLink(obj,0,&loop);
2126
2127         if(!dir && notDir)
2128                 yaffsfs_SetError(-ENOTDIR);
2129         else if(loop)
2130                 yaffsfs_SetError(-ELOOP);
2131         else if(!dir || !obj)
2132                 yaffsfs_SetError(-ENOENT);
2133         else if(obj->my_dev->read_only)
2134                 yaffsfs_SetError(-EROFS);
2135         else
2136                 retVal = yaffsfs_DoChMod(obj,mode);
2137
2138         yaffsfs_Unlock();
2139
2140         return retVal;
2141
2142 }
2143
2144
2145 int yaffs_fchmod(int fd, mode_t mode)
2146 {
2147         struct yaffs_obj *obj;
2148         int retVal = -1;
2149
2150         if(mode & ~(0777)){
2151                 yaffsfs_SetError(-EINVAL);
2152                 return -1;
2153         }
2154
2155         yaffsfs_Lock();
2156         obj = yaffsfs_GetHandleObject(fd);
2157
2158         if(!obj)
2159                 yaffsfs_SetError(-EBADF);
2160         else if(obj->my_dev->read_only)
2161                 yaffsfs_SetError(-EROFS);
2162         else
2163                 retVal = yaffsfs_DoChMod(obj,mode);
2164
2165         yaffsfs_Unlock();
2166
2167         return retVal;
2168 }
2169
2170 int yaffs_mkdir(const YCHAR *path, mode_t mode)
2171 {
2172         struct yaffs_obj *parent = NULL;
2173         struct yaffs_obj *dir = NULL;
2174         YCHAR *name;
2175         YCHAR *alt_path = NULL;
2176         int retVal= -1;
2177         int notDir = 0;
2178         int loop = 0;
2179
2180         if(!path){
2181                 yaffsfs_SetError(-EFAULT);
2182                 return -1;
2183         }
2184
2185         if(yaffsfs_CheckPath(path) < 0){
2186                 yaffsfs_SetError(-ENAMETOOLONG);
2187                 return -1;
2188         }
2189
2190         if(yaffsfs_alt_dir_path(path, &alt_path) < 0){
2191                 yaffsfs_SetError(-ENOMEM);
2192                 return -1;
2193         }
2194         if(alt_path)
2195                 path = alt_path;
2196
2197         yaffsfs_Lock();
2198         parent = yaffsfs_FindDirectory(NULL,path,&name,0,&notDir,&loop);
2199         if(!parent && notDir)
2200                 yaffsfs_SetError(-ENOTDIR);
2201         else if(loop)
2202                 yaffsfs_SetError(-ELOOP);
2203         else if(!parent)
2204                 yaffsfs_SetError(-ENOENT);
2205         else if(yaffs_strnlen(name,5) == 0){
2206                 /* Trying to make the root itself */
2207                 yaffsfs_SetError(-EEXIST);
2208         } else if(parent->my_dev->read_only)
2209                 yaffsfs_SetError(-EROFS);
2210         else {
2211                 dir = yaffs_create_dir(parent,name,mode,0,0);
2212                 if(dir)
2213                         retVal = 0;
2214                 else if (yaffs_find_by_name(parent,name))
2215                         yaffsfs_SetError(-EEXIST); /* the name already exists */
2216                 else
2217                         yaffsfs_SetError(-ENOSPC); /* just assume no space */
2218         }
2219
2220         yaffsfs_Unlock();
2221
2222         if(alt_path)
2223                 YFREE(alt_path);
2224
2225         return retVal;
2226 }
2227
2228 int yaffs_rmdir(const YCHAR *path)
2229 {
2230         int result;
2231         YCHAR *alt_path;
2232
2233         if(!path){
2234                 yaffsfs_SetError(-EFAULT);
2235                 return -1;
2236         }
2237
2238         if(yaffsfs_CheckPath(path) < 0){
2239                 yaffsfs_SetError(-ENAMETOOLONG);
2240                 return -1;
2241         }
2242
2243         if(yaffsfs_alt_dir_path(path, &alt_path) < 0){
2244                 yaffsfs_SetError(-ENOMEM);
2245                 return -1;
2246         }
2247         if(alt_path)
2248                 path = alt_path;
2249         result =  yaffsfs_DoUnlink(path,1);
2250         if(alt_path)
2251                 YFREE(alt_path);
2252         return result;
2253 }
2254
2255
2256 void * yaffs_getdev(const YCHAR *path)
2257 {
2258         struct yaffs_dev *dev=NULL;
2259         YCHAR *dummy;
2260         dev = yaffsfs_FindDevice(path,&dummy);
2261         return (void *)dev;
2262 }
2263
2264 int yaffs_mount2(const YCHAR *path,int read_only)
2265 {
2266         int retVal=-1;
2267         int result=YAFFS_FAIL;
2268         struct yaffs_dev *dev=NULL;
2269
2270         if(!path){
2271                 yaffsfs_SetError(-EFAULT);
2272                 return -1;
2273         }
2274
2275         T(YAFFS_TRACE_MOUNT,(TSTR("yaffs: Mounting %s" TENDSTR),path));
2276
2277         if(yaffsfs_CheckPath(path) < 0){
2278                 yaffsfs_SetError(-ENAMETOOLONG);
2279                 return -1;
2280         }
2281
2282         yaffsfs_Lock();
2283
2284         yaffsfs_InitHandles();
2285
2286         dev = yaffsfs_FindMountPoint(path);
2287         if(dev){
2288                 if(!dev->is_mounted){
2289                         dev->read_only = read_only ? 1 : 0;
2290                         result = yaffs_guts_initialise(dev);
2291                         if(result == YAFFS_FAIL)
2292                                 yaffsfs_SetError(-ENOMEM);
2293                         retVal = result ? 0 : -1;
2294
2295                 }
2296                 else
2297                         yaffsfs_SetError(-EBUSY);
2298         } else
2299                 yaffsfs_SetError(-ENODEV);
2300
2301         yaffsfs_Unlock();
2302         return retVal;
2303
2304 }
2305
2306 int yaffs_mount(const YCHAR *path)
2307 {
2308         return yaffs_mount2(path,0);
2309 }
2310
2311 int yaffs_sync(const YCHAR *path)
2312 {
2313         int retVal=-1;
2314         struct yaffs_dev *dev=NULL;
2315         YCHAR *dummy;
2316
2317         if(!path){
2318                 yaffsfs_SetError(-EFAULT);
2319                 return -1;
2320         }
2321
2322         if(yaffsfs_CheckPath(path) < 0){
2323                 yaffsfs_SetError(-ENAMETOOLONG);
2324                 return -1;
2325         }
2326
2327         yaffsfs_Lock();
2328         dev = yaffsfs_FindDevice(path,&dummy);
2329         if(dev){
2330                 if(!dev->is_mounted)
2331                         yaffsfs_SetError(-EINVAL);
2332                 else if(dev->read_only)
2333                         yaffsfs_SetError(-EROFS);
2334                 else {
2335
2336                         yaffs_flush_whole_cache(dev);
2337                         yaffs_checkpoint_save(dev);
2338                         retVal = 0;
2339
2340                 }
2341         }else
2342                 yaffsfs_SetError(-ENODEV);
2343
2344         yaffsfs_Unlock();
2345         return retVal;
2346 }
2347
2348
2349 int yaffs_remount(const YCHAR *path, int force, int read_only)
2350 {
2351         int retVal=-1;
2352         struct yaffs_dev *dev=NULL;
2353         yaffsfs_Handle *yh;
2354
2355         if(!path){
2356                 yaffsfs_SetError(-EFAULT);
2357                 return -1;
2358         }
2359
2360         if(yaffsfs_CheckPath(path) < 0){
2361                 yaffsfs_SetError(-ENAMETOOLONG);
2362                 return -1;
2363         }
2364
2365         yaffsfs_Lock();
2366         dev = yaffsfs_FindMountPoint(path);
2367         if(dev){
2368                 if(dev->is_mounted){
2369                         int i;
2370                         int inUse;
2371
2372                         yaffs_flush_whole_cache(dev);
2373
2374                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse && !force; i++){
2375                                 yh = & yaffsfs_handle[i];
2376                                 if(yh->useCount>0 &&
2377                                         yaffsfs_inode[yh->inodeId].iObj->my_dev == dev)
2378                                         inUse = 1; /* the device is in use, can't unmount */
2379                         }
2380
2381                         if(!inUse || force){
2382                                 if(read_only)
2383                                         yaffs_checkpoint_save(dev);
2384                                 dev->read_only =  read_only ? 1 : 0;
2385                                 retVal = 0;
2386                         } else
2387                                 yaffsfs_SetError(-EBUSY);
2388
2389                 } else
2390                         yaffsfs_SetError(-EINVAL);
2391
2392         }
2393         else
2394                 yaffsfs_SetError(-ENODEV);
2395
2396         yaffsfs_Unlock();
2397         return retVal;
2398
2399 }
2400
2401 int yaffs_unmount2(const YCHAR *path, int force)
2402 {
2403         int retVal=-1;
2404         struct yaffs_dev *dev=NULL;
2405
2406         if(!path){
2407                 yaffsfs_SetError(-EFAULT);
2408                 return -1;
2409         }
2410
2411         if(yaffsfs_CheckPath(path) < 0){
2412                 yaffsfs_SetError(-ENAMETOOLONG);
2413                 return -1;
2414         }
2415
2416         yaffsfs_Lock();
2417         dev = yaffsfs_FindMountPoint(path);
2418         if(dev){
2419                 if(dev->is_mounted){
2420                         int i;
2421                         int inUse;
2422
2423                         yaffs_flush_whole_cache(dev);
2424                         yaffs_checkpoint_save(dev);
2425
2426                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++){
2427                                 if(yaffsfs_handle[i].useCount > 0 &&
2428                                 yaffsfs_inode[yaffsfs_handle[i].inodeId].iObj->my_dev == dev)
2429                                         inUse = 1; /* the device is in use, can't unmount */
2430                         }
2431
2432                         if(!inUse || force){
2433                                 if(inUse)
2434                                         yaffsfs_BreakDeviceHandles(dev);
2435                                 yaffs_deinitialise(dev);
2436
2437                                 retVal = 0;
2438                         } else
2439                                 yaffsfs_SetError(-EBUSY);
2440
2441                 } else
2442                         yaffsfs_SetError(-EINVAL);
2443
2444         } else
2445                 yaffsfs_SetError(-ENODEV);
2446
2447         yaffsfs_Unlock();
2448         return retVal;
2449
2450 }
2451
2452 int yaffs_unmount(const YCHAR *path)
2453 {
2454         return yaffs_unmount2(path,0);
2455 }
2456
2457 loff_t yaffs_freespace(const YCHAR *path)
2458 {
2459         loff_t retVal=-1;
2460         struct yaffs_dev *dev=NULL;
2461         YCHAR *dummy;
2462
2463         if(!path){
2464                 yaffsfs_SetError(-EFAULT);
2465                 return -1;
2466         }
2467
2468         if(yaffsfs_CheckPath(path) < 0){
2469                 yaffsfs_SetError(-ENAMETOOLONG);
2470                 return -1;
2471         }
2472
2473         yaffsfs_Lock();
2474         dev = yaffsfs_FindDevice(path,&dummy);
2475         if(dev  && dev->is_mounted){
2476                 retVal = yaffs_get_n_free_chunks(dev);
2477                 retVal *= dev->data_bytes_per_chunk;
2478
2479         } else
2480                 yaffsfs_SetError(-EINVAL);
2481
2482         yaffsfs_Unlock();
2483         return retVal;
2484 }
2485
2486 loff_t yaffs_totalspace(const YCHAR *path)
2487 {
2488         loff_t retVal=-1;
2489         struct yaffs_dev *dev=NULL;
2490         YCHAR *dummy;
2491
2492         if(yaffsfs_CheckPath(path) < 0){
2493                 yaffsfs_SetError(-ENAMETOOLONG);
2494                 return -1;
2495         }
2496
2497         yaffsfs_Lock();
2498         dev = yaffsfs_FindDevice(path,&dummy);
2499         if(dev  && dev->is_mounted){
2500                 retVal = (dev->param.end_block - dev->param.start_block + 1) -
2501                         dev->param.n_reserved_blocks;
2502                 retVal *= dev->param.chunks_per_block;
2503                 retVal *= dev->data_bytes_per_chunk;
2504
2505         } else
2506                 yaffsfs_SetError(-EINVAL);
2507
2508         yaffsfs_Unlock();
2509         return retVal;
2510 }
2511
2512 int yaffs_inodecount(const YCHAR *path)
2513 {
2514         loff_t retVal= -1;
2515         struct yaffs_dev *dev=NULL;
2516         YCHAR *dummy;
2517
2518         if(!path){
2519                 yaffsfs_SetError(-EFAULT);
2520                 return -1;
2521         }
2522
2523         if(yaffsfs_CheckPath(path) < 0){
2524                 yaffsfs_SetError(-ENAMETOOLONG);
2525                 return -1;
2526         }
2527
2528         yaffsfs_Lock();
2529         dev = yaffsfs_FindDevice(path,&dummy);
2530         if(dev  && dev->is_mounted) {
2531            int n_obj = dev->n_obj;
2532            if(n_obj > dev->n_hardlinks)
2533                 retVal = n_obj - dev->n_hardlinks;
2534         }
2535
2536         if(retVal < 0)
2537                 yaffsfs_SetError(-EINVAL);
2538
2539         yaffsfs_Unlock();
2540         return retVal;
2541 }
2542
2543
2544 void yaffs_add_device(struct yaffs_dev *dev)
2545 {
2546         dev->is_mounted = 0;
2547         dev->param.remove_obj_fn = yaffsfs_RemoveObjectCallback;
2548
2549         if(!dev->dev_list.next)
2550                 INIT_LIST_HEAD(&dev->dev_list);
2551
2552         list_add(&dev->dev_list,&yaffsfs_deviceList);
2553 }
2554
2555 void yaffs_remove_device(struct yaffs_dev *dev)
2556 {
2557         list_del_init(&dev->dev_list);
2558 }
2559
2560
2561
2562
2563 /* Directory search stuff. */
2564
2565 /*
2566  * Directory search context
2567  *
2568  * NB this is an opaque structure.
2569  */
2570
2571
2572 typedef struct
2573 {
2574         u32 magic;
2575         yaffs_dirent de;                /* directory entry being used by this dsc */
2576         YCHAR name[NAME_MAX+1];         /* name of directory being searched */
2577         struct yaffs_obj *dirObj;           /* ptr to directory being searched */
2578         struct yaffs_obj *nextReturn;       /* obj to be returned by next readddir */
2579         int offset;
2580         struct list_head others;
2581 } yaffsfs_DirectorySearchContext;
2582
2583
2584
2585 static struct list_head search_contexts;
2586
2587
2588 static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
2589 {
2590         if(dsc &&
2591            dsc->dirObj &&
2592            dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2593
2594            dsc->offset = 0;
2595
2596            if( list_empty(&dsc->dirObj->variant.dir_variant.children))
2597                 dsc->nextReturn = NULL;
2598            else
2599                 dsc->nextReturn = list_entry(dsc->dirObj->variant.dir_variant.children.next,
2600                                                 struct yaffs_obj,siblings);
2601         } else {
2602                 /* Hey someone isn't playing nice! */
2603         }
2604 }
2605
2606 static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
2607 {
2608         if(dsc &&
2609            dsc->dirObj &&
2610            dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2611
2612            if( dsc->nextReturn == NULL ||
2613                list_empty(&dsc->dirObj->variant.dir_variant.children))
2614                 dsc->nextReturn = NULL;
2615            else {
2616                    struct list_head *next = dsc->nextReturn->siblings.next;
2617
2618                    if( next == &dsc->dirObj->variant.dir_variant.children)
2619                         dsc->nextReturn = NULL; /* end of list */
2620                    else
2621                         dsc->nextReturn = list_entry(next,struct yaffs_obj,siblings);
2622            }
2623         } else {
2624                 /* Hey someone isn't playing nice! */
2625         }
2626 }
2627
2628 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj)
2629 {
2630
2631         struct list_head *i;
2632         yaffsfs_DirectorySearchContext *dsc;
2633
2634         /* if search contexts not initilised then skip */
2635         if(!search_contexts.next)
2636                 return;
2637
2638         /* Iterate through the directory search contexts.
2639          * If any are the one being removed, then advance the dsc to
2640          * the next one to prevent a hanging ptr.
2641          */
2642          list_for_each(i, &search_contexts) {
2643                 if (i) {
2644                         dsc = list_entry(i, yaffsfs_DirectorySearchContext,others);
2645                         if(dsc->nextReturn == obj)
2646                                 yaffsfs_DirAdvance(dsc);
2647                 }
2648         }
2649
2650 }
2651
2652 yaffs_DIR *yaffs_opendir(const YCHAR *dirname)
2653 {
2654         yaffs_DIR *dir = NULL;
2655         struct yaffs_obj *obj = NULL;
2656         yaffsfs_DirectorySearchContext *dsc = NULL;
2657         int notDir = 0;
2658         int loop = 0;
2659
2660         if(!dirname){
2661                 yaffsfs_SetError(-EFAULT);
2662                 return NULL;
2663         }
2664
2665         if(yaffsfs_CheckPath(dirname) < 0){
2666                 yaffsfs_SetError(-ENAMETOOLONG);
2667                 return NULL;
2668         }
2669
2670         yaffsfs_Lock();
2671
2672         obj = yaffsfs_FindObject(NULL,dirname,0,1,NULL,&notDir,&loop);
2673
2674         if(!obj && notDir)
2675                 yaffsfs_SetError(-ENOTDIR);
2676         else if(loop)
2677                 yaffsfs_SetError(-ELOOP);
2678         else if(!obj)
2679                 yaffsfs_SetError(-ENOENT);
2680         else if(obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
2681                 yaffsfs_SetError(-ENOTDIR);
2682         else {
2683
2684                 dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
2685                 dir = (yaffs_DIR *)dsc;
2686
2687                 if(dsc){
2688                         memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
2689                         dsc->magic = YAFFS_MAGIC;
2690                         dsc->dirObj = obj;
2691                         yaffs_strncpy(dsc->name,dirname,NAME_MAX);
2692                         INIT_LIST_HEAD(&dsc->others);
2693
2694                         if(!search_contexts.next)
2695                                 INIT_LIST_HEAD(&search_contexts);
2696
2697                         list_add(&dsc->others,&search_contexts);
2698                         yaffsfs_SetDirRewound(dsc);
2699                 }
2700
2701         }
2702
2703         yaffsfs_Unlock();
2704
2705         return dir;
2706 }
2707
2708 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
2709 {
2710         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2711         struct yaffs_dirent *retVal = NULL;
2712
2713         yaffsfs_Lock();
2714
2715         if(dsc && dsc->magic == YAFFS_MAGIC){
2716                 yaffsfs_SetError(0);
2717                 if(dsc->nextReturn){
2718                         dsc->de.d_ino = yaffs_get_equivalent_obj(dsc->nextReturn)->obj_id;
2719                         dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
2720                         dsc->de.d_off = dsc->offset++;
2721                         yaffs_get_obj_name(dsc->nextReturn,dsc->de.d_name,NAME_MAX);
2722                         if(yaffs_strnlen(dsc->de.d_name,NAME_MAX+1) == 0)
2723                         {
2724                                 /* this should not happen! */
2725                                 yaffs_strcpy(dsc->de.d_name,_Y("zz"));
2726                         }
2727                         dsc->de.d_reclen = sizeof(struct yaffs_dirent);
2728                         retVal = &dsc->de;
2729                         yaffsfs_DirAdvance(dsc);
2730                 } else
2731                         retVal = NULL;
2732         } else
2733                 yaffsfs_SetError(-EBADF);
2734
2735         yaffsfs_Unlock();
2736
2737         return retVal;
2738
2739 }
2740
2741
2742 void yaffs_rewinddir(yaffs_DIR *dirp)
2743 {
2744         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2745
2746         yaffsfs_Lock();
2747
2748         yaffsfs_SetDirRewound(dsc);
2749
2750         yaffsfs_Unlock();
2751 }
2752
2753
2754 int yaffs_closedir(yaffs_DIR *dirp)
2755 {
2756         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2757
2758         if(!dsc){
2759                 yaffsfs_SetError(-EFAULT);
2760                 return -1;
2761         }
2762
2763         yaffsfs_Lock();
2764         dsc->magic = 0;
2765         list_del(&dsc->others); /* unhook from list */
2766         YFREE(dsc);
2767         yaffsfs_Unlock();
2768         return 0;
2769 }
2770
2771 /* End of directory stuff */
2772
2773
2774 int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath)
2775 {
2776         struct yaffs_obj *parent = NULL;
2777         struct yaffs_obj *obj;
2778         YCHAR *name;
2779         int retVal= -1;
2780         int mode = 0; /* ignore for now */
2781         int notDir = 0;
2782         int loop = 0;
2783
2784         if(!oldpath || !newpath){
2785                 yaffsfs_SetError(-EFAULT);
2786                 return -1;
2787         }
2788
2789         if(yaffsfs_CheckPath(newpath) < 0){
2790                 yaffsfs_SetError(-ENAMETOOLONG);
2791                 return -1;
2792         }
2793         yaffsfs_Lock();
2794         parent = yaffsfs_FindDirectory(NULL,newpath,&name,0,&notDir,&loop);
2795         if(!parent && notDir)
2796                 yaffsfs_SetError(-ENOTDIR);
2797         else if(loop)
2798                 yaffsfs_SetError(-ELOOP);
2799         else if( !parent || yaffs_strnlen(name,5) < 1)
2800                 yaffsfs_SetError(-ENOENT);
2801         else if(parent->my_dev->read_only)
2802                 yaffsfs_SetError(-EROFS);
2803         else if(parent){
2804                 obj = yaffs_create_symlink(parent,name,mode,0,0,oldpath);
2805                 if(obj)
2806                         retVal = 0;
2807                 else if (yaffsfs_FindObject(NULL,newpath,0,0, NULL,NULL,NULL))
2808                         yaffsfs_SetError(-EEXIST);
2809                 else
2810                         yaffsfs_SetError(-ENOSPC);
2811         }
2812
2813         yaffsfs_Unlock();
2814
2815         return retVal;
2816
2817 }
2818
2819 int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz)
2820 {
2821         struct yaffs_obj *obj = NULL;
2822         struct yaffs_obj *dir = NULL;
2823         int retVal= -1;
2824         int notDir = 0;
2825         int loop = 0;
2826
2827         if(!path || !buf){
2828                 yaffsfs_SetError(-EFAULT);
2829                 return -1;
2830         }
2831
2832         yaffsfs_Lock();
2833
2834         obj = yaffsfs_FindObject(NULL,path,0,1, &dir,&notDir,&loop);
2835
2836         if(!dir && notDir)
2837                 yaffsfs_SetError(-ENOTDIR);
2838         else if(loop)
2839                 yaffsfs_SetError(-ELOOP);
2840         else if(!dir || !obj)
2841                 yaffsfs_SetError(-ENOENT);
2842         else if(obj->variant_type != YAFFS_OBJECT_TYPE_SYMLINK)
2843                 yaffsfs_SetError(-EINVAL);
2844         else {
2845                 YCHAR *alias = obj->variant.symlink_variant.alias;
2846                 memset(buf,0,bufsiz);
2847                 yaffs_strncpy(buf,alias,bufsiz - 1);
2848                 retVal = 0;
2849         }
2850         yaffsfs_Unlock();
2851         return retVal;
2852 }
2853
2854 int yaffs_link(const YCHAR *oldpath, const YCHAR *linkpath)
2855 {
2856         /* Creates a link called newpath to existing oldpath */
2857         struct yaffs_obj *obj = NULL;
2858         struct yaffs_obj *lnk = NULL;
2859         struct yaffs_obj *obj_dir = NULL;
2860         struct yaffs_obj *lnk_dir = NULL;
2861         int retVal = -1;
2862         int notDirObj = 0;
2863         int notDirLnk = 0;
2864         int objLoop = 0;
2865         int lnkLoop = 0;
2866         YCHAR *newname;
2867
2868         if(!oldpath || !linkpath){
2869                 yaffsfs_SetError(-EFAULT);
2870                 return -1;
2871         }
2872
2873         if(yaffsfs_CheckPath(linkpath) < 0){
2874                 yaffsfs_SetError(-ENAMETOOLONG);
2875                 return -1;
2876         }
2877
2878         yaffsfs_Lock();
2879
2880         obj = yaffsfs_FindObject(NULL,oldpath,0,1,&obj_dir,&notDirObj,&objLoop);
2881         lnk = yaffsfs_FindObject(NULL,linkpath,0,0,NULL,NULL,NULL);
2882         lnk_dir = yaffsfs_FindDirectory(NULL,linkpath,&newname,0,&notDirLnk,&lnkLoop);
2883
2884         if((!obj_dir && notDirObj) || (!lnk_dir && notDirLnk))
2885                 yaffsfs_SetError(-ENOTDIR);
2886         else if(objLoop || lnkLoop)
2887                 yaffsfs_SetError(-ELOOP);
2888         else if(!obj_dir || !lnk_dir || !obj)
2889                 yaffsfs_SetError(-ENOENT);
2890         else if(obj->my_dev->read_only)
2891                 yaffsfs_SetError(-EROFS);
2892         else if(lnk)
2893                 yaffsfs_SetError(-EEXIST);
2894         else if(lnk_dir->my_dev != obj->my_dev)
2895                 yaffsfs_SetError(-EXDEV);
2896         else {
2897                 retVal = yaffsfs_CheckNameLength(newname);
2898
2899                 if(retVal == 0) {
2900                         lnk = yaffs_link_obj(lnk_dir,newname,obj);
2901                         if(lnk)
2902                                 retVal = 0;
2903                         else{
2904                                 yaffsfs_SetError(-ENOSPC);
2905                                 retVal = -1;
2906                         }
2907                 }
2908         }
2909         yaffsfs_Unlock();
2910
2911         return retVal;
2912 }
2913
2914 int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev)
2915 {
2916         pathname=pathname;
2917         mode=mode;
2918         dev=dev;
2919
2920         yaffsfs_SetError(-EINVAL);
2921         return -1;
2922 }
2923
2924
2925 /*
2926  * D E B U G   F U N C T I O N S
2927  */
2928
2929 /*
2930  * yaffs_n_handles()
2931  * Returns number of handles attached to the object
2932  */
2933 int yaffs_n_handles(const YCHAR *path)
2934 {
2935         struct yaffs_obj *obj;
2936
2937         if(!path){
2938                 yaffsfs_SetError(-EFAULT);
2939                 return -1;
2940         }
2941
2942         if(yaffsfs_CheckPath(path) < 0){
2943                 yaffsfs_SetError(-ENAMETOOLONG);
2944                 return -1;
2945         }
2946
2947         obj = yaffsfs_FindObject(NULL,path,0,1,NULL,NULL,NULL);
2948
2949         if(obj)
2950                 return yaffsfs_CountHandles(obj);
2951         else
2952                 return -1;
2953 }
2954
2955 int yaffs_get_error(void)
2956 {
2957         return yaffsfs_GetLastError();
2958 }
2959
2960 int yaffs_set_error(int error)
2961 {
2962         yaffsfs_SetError(error);
2963         return 0;
2964 }
2965
2966 int yaffs_dump_dev(const YCHAR *path)
2967 {
2968 #if 1
2969         path=path;
2970 #else
2971         YCHAR *rest;
2972
2973         struct yaffs_obj *obj = yaffsfs_FindRoot(path,&rest);
2974
2975         if(obj){
2976                 struct yaffs_dev *dev = obj->my_dev;
2977
2978                 printf("\n"
2979                            "n_page_writes.......... %d\n"
2980                            "n_page_reads........... %d\n"
2981                            "n_erasures....... %d\n"
2982                            "n_gc_copies............ %d\n"
2983                            "garbageCollections... %d\n"
2984                            "passiveGarbageColl'ns %d\n"
2985                            "\n",
2986                                 dev->n_page_writes,
2987                                 dev->n_page_reads,
2988                                 dev->n_erasures,
2989                                 dev->n_gc_copies,
2990                                 dev->garbageCollections,
2991                                 dev->passiveGarbageCollections
2992                 );
2993
2994         }
2995
2996 #endif
2997         return 0;
2998 }
2999