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, const YCHAR *path, int symDepth, int getEquiv);
  35 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj);
  36
  37 unsigned int yaffs_wr_attempts;
  38
  39 /*
  40  * Handle management.
  41  * There are open inodes in yaffsfs_Inode.
  42  * There are open handles in yaffsfs_Handle.
  43  *
  44  * Things are structured this way to be like the Linux VFS model
  45  * so that interactions with the yaffs guts calls are similar.
  46  * That means more common code paths and less special code.
  47  * That means better testing etc.
  48  */
  49
  50 typedef struct {
  51         int count;      /* Number of handles accessing this inode */
  52         struct yaffs_obj *iObj;
  53 } yaffsfs_Inode;
  54
  55 typedef struct{
  56         u8      reading:1;
  57         u8      writing:1;
  58         u8      append:1;
  59         u8      shareRead:1;
  60         u8      shareWrite:1;
  61         int     inodeId:12;     /* Index to corresponding yaffsfs_Inode */
  62         int     useCount:10;    /* Use count for this handle */
  63         u32 position;           /* current position in file */
  64 }yaffsfs_Handle;
  65
  66 static yaffsfs_Inode yaffsfs_inode[YAFFSFS_N_HANDLES];
  67 static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
  68 static int yaffsfs_handlesInitialised;
  69
  70 unsigned int yaffs_trace_mask;
  71
  72 int yaffs_set_trace(unsigned int tm)
  73 {
  74         return yaffs_trace_mask=tm;
  75 }
  76
  77 unsigned int yaffs_get_trace(void)
  78 {
  79         return yaffs_trace_mask;
  80 }
  81
  82 /*
  83  * yaffsfs_InitHandle
  84  * Inilitalise handle management on start-up.
  85  */
  86
  87 static void yaffsfs_InitHandles(void)
  88 {
  89         int i;
  90         if(yaffsfs_handlesInitialised)
  91                 return;
  92
  93         memset(yaffsfs_inode,0,sizeof(yaffsfs_inode));
  94         memset(yaffsfs_handle,0,sizeof(yaffsfs_handle));
  95         for(i = 0; i < YAFFSFS_N_HANDLES; i++)
  96                 yaffsfs_handle[i].inodeId = -1;
  97 }
  98
  99 yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
 100 {
 101         if(h < 0 || h >= YAFFSFS_N_HANDLES)
 102                 return NULL;
 103
 104         return &yaffsfs_handle[h];
 105 }
 106
 107 yaffsfs_Inode *yaffsfs_GetInodePointer(int handle)
 108 {
 109         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 110
 111         if(h && h->useCount > 0 && h->inodeId >= 0 && h->inodeId < YAFFSFS_N_HANDLES)
 112                 return  &yaffsfs_inode[h->inodeId];
 113
 114         return NULL;
 115 }
 116
 117 struct yaffs_obj *yaffsfs_GetHandleObject(int handle)
 118 {
 119         yaffsfs_Inode *in = yaffsfs_GetInodePointer(handle);
 120
 121         if(in)
 122                 return in->iObj;
 123
 124         return NULL;
 125 }
 126
 127 /*
 128  * yaffsfs_FindInodeIdForObject
 129  * Find the inode entry for an object, if it exists.
 130  */
 131
 132 static int yaffsfs_FindInodeIdForObject(struct yaffs_obj *obj)
 133 {
 134         int i;
 135         int ret = -1;
 136
 137         if(obj)
 138                 obj = yaffs_get_equivalent_obj(obj);
 139
 140         /* Look for it in open inode table*/
 141         for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
 142                 if(yaffsfs_inode[i].iObj == obj)
 143                         ret = i;
 144         }
 145         return ret;
 146 }
 147
 148 /*
 149  * yaffsfs_GetInodeIdForObject
 150  * Grab an inode entry when opening a new inode.
 151  */
 152 static int yaffsfs_GetInodeIdForObject(struct yaffs_obj *obj)
 153 {
 154         int i;
 155         int ret;
 156         yaffsfs_Inode *in = NULL;
 157
 158         if(obj)
 159                 obj = yaffs_get_equivalent_obj(obj);
 160
 161         ret = yaffsfs_FindInodeIdForObject(obj);
 162
 163         for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
 164                 if(!yaffsfs_inode[i].iObj)
 165                         ret = i;
 166         }
 167
 168         if(ret>=0){
 169                 in = &yaffsfs_inode[ret];
 170                 if(!in->iObj)
 171                         in->count = 0;
 172                 in->iObj = obj;
 173                 in->count++;
 174         }
 175
 176
 177         return ret;
 178 }
 179
 180
 181 static int yaffsfs_CountHandles(struct yaffs_obj *obj)
 182 {
 183         int i = yaffsfs_FindInodeIdForObject(obj);
 184
 185         if(i >= 0)
 186                 return yaffsfs_inode[i].count;
 187         else
 188                 return 0;
 189 }
 190
 191 static void yaffsfs_ReleaseInode(yaffsfs_Inode *in)
 192 {
 193         struct yaffs_obj *obj;
 194
 195         obj = in->iObj;
 196
 197         if(obj->unlinked)
 198                 yaffs_del_obj(obj);
 199
 200         obj->my_inode = NULL;
 201         in->iObj = NULL;
 202
 203 }
 204
 205 static void yaffsfs_PutInode(int inodeId)
 206 {
 207         if(inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES){
 208                 yaffsfs_Inode *in = & yaffsfs_inode[inodeId];
 209                 in->count--;
 210                 if(in->count <= 0)
 211                         yaffsfs_ReleaseInode(in);
 212         }
 213 }
 214
 215
 216 /*
 217  * yaffsfs_GetHandle
 218  * Grab a handle (when opening a file)
 219  */
 220
 221 static int yaffsfs_GetNewHandle(void)
 222 {
 223         int i;
 224         yaffsfs_Handle *h;
 225
 226         for(i = 0; i < YAFFSFS_N_HANDLES; i++){
 227                 h = yaffsfs_GetHandlePointer(i);
 228                 if(!h){
 229                         /* todo bug: should never happen */
 230                 }
 231                 if(h->useCount < 1){
 232                         memset(h,0,sizeof(yaffsfs_Handle));
 233                         h->inodeId=-1;
 234                         h->useCount=1;
 235                         return i;
 236                 }
 237         }
 238         return -1;
 239 }
 240
 241 /*
 242  * yaffs_get_handle
 243  * Increase use of handle when reading/writing a file
 244  */
 245 static int yaffsfs_GetHandle(int handle)
 246 {
 247         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 248
 249         if(h && h->useCount > 0){
 250                 h->useCount++;
 251         }
 252         return 0;
 253 }
 254
 255 /*
 256  * yaffs_put_handle
 257  * Let go of a handle when closing a file or aborting an open or
 258  * ending a read or write.
 259  */
 260 static int yaffsfs_PutHandle(int handle)
 261 {
 262         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 263
 264         if(h && h->useCount > 0){
 265                 h->useCount--;
 266                 if(h->useCount < 1){
 267                         if(h->inodeId >= 0){
 268                                 yaffsfs_PutInode(h->inodeId);
 269                                 h->inodeId = -1;
 270                         }
 271                 }
 272         }
 273         return 0;
 274 }
 275
 276
 277
 278
 279 /*
 280  *  Stuff to search for a directory from a path
 281  */
 282
 283
 284 int yaffsfs_Match(YCHAR a, YCHAR b)
 285 {
 286         /* case sensitive */
 287         return (a == b);
 288 }
 289
 290 int yaffsfs_IsPathDivider(YCHAR ch)
 291 {
 292         const YCHAR *str = YAFFS_PATH_DIVIDERS;
 293
 294         while(*str){
 295                 if(*str == ch)
 296                         return 1;
 297                 str++;
 298         }
 299
 300         return 0;
 301 }
 302
 303
 304
 305 LIST_HEAD(yaffsfs_deviceList);
 306
 307 /*
 308  * yaffsfs_FindDevice
 309  * yaffsfs_FindRoot
 310  * Scan the configuration list to find the root.
 311  * Curveballs: Should match paths that end in '/' too
 312  * Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
 313  */
 314 static struct yaffs_dev *yaffsfs_FindDevice(const YCHAR *path, YCHAR **restOfPath)
 315 {
 316         struct list_head *cfg;
 317         const YCHAR *leftOver;
 318         const YCHAR *p;
 319         struct yaffs_dev *retval = NULL;
 320         struct yaffs_dev *dev = NULL;
 321         int thisMatchLength;
 322         int longestMatch = -1;
 323         int matching;
 324
 325         /*
 326          * Check all configs, choose the one that:
 327          * 1) Actually matches a prefix (ie /a amd /abc will not match
 328          * 2) Matches the longest.
 329          */
 330         list_for_each(cfg, &yaffsfs_deviceList){
 331                 dev = list_entry(cfg, struct yaffs_dev, dev_list);
 332                 leftOver = path;
 333                 p = dev->param.name;
 334                 thisMatchLength = 0;
 335                 matching = 1;
 336
 337
 338                 while(matching && *p && *leftOver){
 339                         /* Skip over any /s */
 340                         while(yaffsfs_IsPathDivider(*p))
 341                               p++;
 342
 343                         /* Skip over any /s */
 344                         while(yaffsfs_IsPathDivider(*leftOver))
 345                               leftOver++;
 346
 347                         /* Now match the text part */
 348                         while(matching &&
 349                               *p && !yaffsfs_IsPathDivider(*p) &&
 350                               *leftOver && !yaffsfs_IsPathDivider(*leftOver)){
 351                                 if(yaffsfs_Match(*p,*leftOver)){
 352                                         p++;
 353                                         leftOver++;
 354                                         thisMatchLength++;
 355                                 } else {
 356                                         matching = 0;
 357                                 }
 358                         }
 359                 }
 360
 361                 /* Skip over any /s in leftOver */
 362                 while(yaffsfs_IsPathDivider(*leftOver))
 363                       leftOver++;
 364
 365                 // Skip over any /s in p
 366                 while(yaffsfs_IsPathDivider(*p))
 367                       p++;
 368
 369                 // p should now be at the end of the string (ie. fully matched)
 370                 if(*p)
 371                         matching = 0;
 372
 373                 if( matching && (thisMatchLength > longestMatch))
 374                 {
 375                         // Matched prefix
 376                         *restOfPath = (YCHAR *)leftOver;
 377                         retval = dev;
 378                         longestMatch = thisMatchLength;
 379                 }
 380
 381         }
 382         return retval;
 383 }
 384
 385 #if 0
 386 static struct yaffs_dev *yaffsfs_FindDevice(const YCHAR *path, YCHAR **restOfPath)
 387 {
 388         yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList;
 389         const YCHAR *leftOver;
 390         const YCHAR *p;
 391         struct yaffs_dev *retval = NULL;
 392         int thisMatchLength;
 393         int longestMatch = -1;
 394
 395         /*
 396          * Check all configs, choose the one that:
 397          * 1) Actually matches a prefix (ie /a amd /abc will not match
 398          * 2) Matches the longest.
 399          */
 400         while(cfg && cfg->prefix && cfg->dev){
 401                 leftOver = path;
 402                 p = cfg->prefix;
 403                 thisMatchLength = 0;
 404
 405                 while(*p &&  /* unmatched part of prefix */
 406                       !(yaffsfs_IsPathDivider(*p) && (p[1] == 0)) &&
 407                       *leftOver && yaffsfs_Match(*p,*leftOver)){
 408                         p++;
 409                         leftOver++;
 410                         thisMatchLength++;
 411                 }
 412
 413
 414                 if((!*p || (yaffsfs_IsPathDivider(*p) && (p[1] == 0))) &&  /* end of prefix */
 415                    (!*leftOver || yaffsfs_IsPathDivider(*leftOver)) && /* no more in this path name part */
 416                    (thisMatchLength > longestMatch)){
 417                         /* Matched prefix */
 418                         *restOfPath = (YCHAR *)leftOver;
 419                         retval = cfg->dev;
 420                         longestMatch = thisMatchLength;
 421                 }
 422                 cfg++;
 423         }
 424         return retval;
 425 }
 426 #endif
 427
 428 static struct yaffs_obj *yaffsfs_FindRoot(const YCHAR *path, YCHAR **restOfPath)
 429 {
 430
 431         struct yaffs_dev *dev;
 432
 433         dev= yaffsfs_FindDevice(path,restOfPath);
 434         if(dev && dev->is_mounted){
 435                 return dev->root_dir;
 436         }
 437         return NULL;
 438 }
 439
 440 static struct yaffs_obj *yaffsfs_FollowLink(struct yaffs_obj *obj,int symDepth)
 441 {
 442
 443         if(obj)
 444                 obj = yaffs_get_equivalent_obj(obj);
 445
 446         while(obj && obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK){
 447                 YCHAR *alias = obj->variant.symlink_variant.alias;
 448
 449                 if(yaffsfs_IsPathDivider(*alias))
 450                         /* Starts with a /, need to scan from root up */
 451                         obj = yaffsfs_FindObject(NULL,alias,symDepth++,1);
 452                 else
 453                         /* Relative to here, so use the parent of the symlink as a start */
 454                         obj = yaffsfs_FindObject(obj->parent,alias,symDepth++,1);
 455         }
 456         return obj;
 457 }
 458
 459
 460 /*
 461  * yaffsfs_FindDirectory
 462  * Parse a path to determine the directory and the name within the directory.
 463  *
 464  * eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
 465  */
 466 static struct yaffs_obj *yaffsfs_DoFindDirectory(struct yaffs_obj *startDir,
 467                                 const YCHAR *path, YCHAR **name, int symDepth)
 468 {
 469         struct yaffs_obj *dir;
 470         YCHAR *restOfPath;
 471         YCHAR str[YAFFS_MAX_NAME_LENGTH+1];
 472         int i;
 473
 474         if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES)
 475                 return NULL;
 476
 477         if(startDir){
 478                 dir = startDir;
 479                 restOfPath = (YCHAR *)path;
 480         }
 481         else
 482                 dir = yaffsfs_FindRoot(path,&restOfPath);
 483
 484         while(dir){
 485                 /*
 486                  * parse off /.
 487                  * curve ball: also throw away surplus '/'
 488                  * eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
 489                  */
 490                 while(yaffsfs_IsPathDivider(*restOfPath))
 491                         restOfPath++; /* get rid of '/' */
 492
 493                 *name = restOfPath;
 494                 i = 0;
 495
 496                 while(*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)){
 497                         if (i < YAFFS_MAX_NAME_LENGTH){
 498                                 str[i] = *restOfPath;
 499                                 str[i+1] = '\0';
 500                                 i++;
 501                         }
 502                         restOfPath++;
 503                 }
 504
 505                 if(!*restOfPath)
 506                         /* got to the end of the string */
 507                         return dir;
 508                 else{
 509                         if(yaffs_strcmp(str,_Y(".")) == 0)
 510                         {
 511                                 /* Do nothing */
 512                         }
 513                         else if(yaffs_strcmp(str,_Y("..")) == 0)
 514                                 dir = dir->parent;
 515                         else{
 516                                 dir = yaffs_find_by_name(dir,str);
 517
 518                                 dir = yaffsfs_FollowLink(dir,symDepth);
 519
 520                                 if(dir && dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
 521                                         dir = NULL;
 522                         }
 523                 }
 524         }
 525         /* directory did not exist. */
 526         return NULL;
 527 }
 528
 529 static struct yaffs_obj *yaffsfs_FindDirectory(struct yaffs_obj *relativeDirectory,
 530                                         const YCHAR *path,YCHAR **name,int symDepth)
 531 {
 532         return yaffsfs_DoFindDirectory(relativeDirectory,path,name,symDepth);
 533 }
 534
 535 /*
 536  * yaffsfs_FindObject turns a path for an existing object into the object
 537  */
 538 static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relativeDirectory, const YCHAR *path,int symDepth, int getEquiv)
 539 {
 540         struct yaffs_obj *dir;
 541         struct yaffs_obj *obj;
 542         YCHAR *name;
 543
 544         dir = yaffsfs_FindDirectory(relativeDirectory,path,&name,symDepth);
 545
 546         if(dir && *name)
 547                 obj = yaffs_find_by_name(dir,name);
 548         else
 549                 obj = dir;
 550
 551         if(getEquiv)
 552                 obj = yaffs_get_equivalent_obj(obj);
 553
 554         return obj;
 555 }
 556
 557
 558 int yaffs_dup(int fd)
 559 {
 560         int newHandle = -1;
 561         yaffsfs_Handle *oldPtr = NULL;
 562         yaffsfs_Handle *newPtr = NULL;
 563
 564         yaffsfs_Lock();
 565
 566         oldPtr = yaffsfs_GetHandlePointer(fd);
 567         if(oldPtr && oldPtr->useCount > 0)
 568                 newHandle = yaffsfs_GetNewHandle();
 569         if(newHandle >= 0)
 570                 newPtr = yaffsfs_GetHandlePointer(newHandle);
 571
 572         if(newPtr){
 573                 *newPtr = *oldPtr;
 574                 return newHandle;
 575         }
 576
 577         if(!oldPtr)
 578                 yaffsfs_SetError(-EBADF);
 579         else
 580                 yaffsfs_SetError(-ENOMEM);
 581
 582         return -1;
 583
 584 }
 585
 586
 587
 588 int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int sharing)
 589 {
 590         struct yaffs_obj *obj = NULL;
 591         struct yaffs_obj *dir = NULL;
 592         YCHAR *name;
 593         int handle = -1;
 594         yaffsfs_Handle *yh = NULL;
 595         int openDenied = 0;
 596         int symDepth = 0;
 597         int errorReported = 0;
 598         int rwflags = oflag & ( O_RDWR | O_RDONLY | O_WRONLY);
 599         u8 shareRead = (sharing & YAFFS_SHARE_READ) ?  1 : 0;
 600         u8 shareWrite = (sharing & YAFFS_SHARE_WRITE) ? 1 : 0;
 601         u8 sharedReadAllowed;
 602         u8 sharedWriteAllowed;
 603         u8 alreadyReading;
 604         u8 alreadyWriting;
 605         u8 readRequested;
 606         u8 writeRequested;
 607
 608         /* O_EXCL only has meaning if O_CREAT is specified */
 609         if(!(oflag & O_CREAT))
 610                 oflag &= ~(O_EXCL);
 611
 612         /* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
 613         if( (oflag & O_CREAT) & (oflag & O_EXCL))
 614                 oflag &= ~(O_TRUNC);
 615
 616         /* Todo: Are there any more flag combos to sanitise ? */
 617
 618         /* Figure out if reading or writing is requested */
 619
 620         readRequested = (rwflags == O_RDWR || rwflags == O_RDONLY) ? 1 : 0;
 621         writeRequested = (rwflags == O_RDWR || rwflags == O_WRONLY) ? 1 : 0;
 622
 623         yaffsfs_Lock();
 624
 625         handle = yaffsfs_GetNewHandle();
 626
 627         if(handle < 0){
 628                 yaffsfs_SetError(-ENFILE);
 629                 errorReported = 1;
 630         } else {
 631
 632                 yh = yaffsfs_GetHandlePointer(handle);
 633
 634                 /* try to find the exisiting object */
 635                 obj = yaffsfs_FindObject(NULL,path,0,1);
 636
 637                 obj = yaffsfs_FollowLink(obj,symDepth++);
 638
 639                 if(obj &&
 640                         obj->variant_type != YAFFS_OBJECT_TYPE_FILE &&
 641                         obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
 642                         obj = NULL;
 643
 644                 if(obj){
 645
 646                         /* The file already exists or it might be a directory */
 647
 648                         /* If it is a directory then we can't open it as a file */
 649                         if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
 650                                 openDenied = 1;
 651                                 yaffsfs_SetError(-EISDIR);
 652                                 errorReported = 1;
 653                         }
 654
 655                         /* Open should fail if O_CREAT and O_EXCL are specified since
 656                          * the file exists
 657                          */
 658                         if((oflag & O_EXCL) && (oflag & O_CREAT)){
 659                                 openDenied = 1;
 660                                 yaffsfs_SetError(-EEXIST);
 661                                 errorReported = 1;
 662                         }
 663
 664                         /* Check file permissions */
 665                         if( readRequested && !(obj->yst_mode & S_IREAD))
 666                                 openDenied = 1;
 667
 668                         if( writeRequested && !(obj->yst_mode & S_IWRITE))
 669                                 openDenied = 1;
 670
 671                         /* Check sharing of an existing object. */
 672                         {
 673                                 yaffsfs_Handle *hx;
 674                                 int i;
 675                                 sharedReadAllowed = 1;
 676                                 sharedWriteAllowed = 1;
 677                                 alreadyReading = 0;
 678                                 alreadyWriting = 0;
 679                                 for( i = 0; i < YAFFSFS_N_HANDLES; i++){
 680                                         hx = &yaffsfs_handle[i];
 681                                         if(hx->useCount > 0 &&
 682                                                 hx->inodeId >= 0 &&
 683                                                 yaffsfs_inode[hx->inodeId].iObj == obj){
 684                                                 if(!hx->shareRead)
 685                                                         sharedReadAllowed = 0;
 686                                                 if(!hx->shareWrite)
 687                                                         sharedWriteAllowed = 0;
 688                                                 if(hx->reading)
 689                                                         alreadyReading = 1;
 690                                                 if(hx->writing)
 691                                                         alreadyWriting = 1;
 692                                         }
 693                                 }
 694
 695
 696
 697                                 if((!sharedReadAllowed && readRequested)||
 698                                         (!shareRead  && alreadyReading) ||
 699                                         (!sharedWriteAllowed && writeRequested) ||
 700                                         (!shareWrite && alreadyWriting)){
 701                                         openDenied = 1;
 702                                         yaffsfs_SetError(-EBUSY);
 703                                         errorReported=1;
 704                                 }
 705                         }
 706
 707                 } else if((oflag & O_CREAT)) {
 708                         /* Let's see if we can create this file */
 709                         dir = yaffsfs_FindDirectory(NULL,path,&name,0);
 710                         if(dir  && dir->my_dev->read_only){
 711                                 yaffsfs_SetError(-EINVAL);
 712                                 errorReported = 1;
 713                         } else if(dir)
 714                                 obj = yaffs_create_file(dir,name,mode,0,0);
 715                         else {
 716                                 yaffsfs_SetError(-ENOTDIR);
 717                                 errorReported = 1;
 718                         }
 719                 }
 720
 721                 if(obj && !openDenied) {
 722                         int inodeId = yaffsfs_GetInodeIdForObject(obj);
 723
 724                         if(inodeId<0) {
 725                                 /*
 726                                  * Todo: Fix any problem if inodes run out, though that
 727                                  * can't happen if the number of inode items >= number of handles.
 728                                  */
 729                         }
 730
 731                         yh->inodeId = inodeId;
 732                         yh->reading = readRequested;
 733                         yh->writing = writeRequested;
 734                         yh->append =  (oflag & O_APPEND) ? 1 : 0;
 735                         yh->position = 0;
 736                         yh->shareRead = shareRead;
 737                         yh->shareWrite = shareWrite;
 738
 739                         /* Hook inode to object */
 740                         obj->my_inode = (void*) &yaffsfs_inode[inodeId];
 741
 742                         if((oflag & O_TRUNC) && yh->writing)
 743                                 yaffs_resize_file(obj,0);
 744                 } else {
 745                         yaffsfs_PutHandle(handle);
 746                         if(!errorReported) {
 747                                 yaffsfs_SetError(!obj ? -ENOSPC : -EACCES);
 748                                 errorReported = 1;
 749                         }
 750                         handle = -1;
 751                 }
 752         }
 753
 754         yaffsfs_Unlock();
 755
 756         return handle;
 757 }
 758
 759 int yaffs_open(const YCHAR *path, int oflag, int mode)
 760 {
 761         return yaffs_open_sharing(path, oflag, mode, YAFFS_SHARE_READ | YAFFS_SHARE_WRITE);
 762 }
 763
 764 int yaffs_Dofsync(int fd,int datasync)
 765 {
 766         yaffsfs_Handle *h = NULL;
 767         int retVal = 0;
 768
 769         yaffsfs_Lock();
 770
 771         h = yaffsfs_GetHandlePointer(fd);
 772
 773         if(h && h->useCount > 0)
 774                 /* flush the file */
 775                 yaffs_flush_file(yaffsfs_inode[h->inodeId].iObj,1,datasync);
 776         else {
 777                 /* bad handle */
 778                 yaffsfs_SetError(-EBADF);
 779                 retVal = -1;
 780         }
 781
 782         yaffsfs_Unlock();
 783
 784         return retVal;
 785 }
 786
 787 int yaffs_fsync(int fd)
 788 {
 789         return yaffs_Dofsync(fd,0);
 790 }
 791
 792 int yaffs_flush(int fd)
 793 {
 794         return yaffs_fsync(fd);
 795 }
 796
 797 int yaffs_fdatasync(int fd)
 798 {
 799         return yaffs_Dofsync(fd,1);
 800 }
 801
 802 int yaffs_close(int fd)
 803 {
 804         yaffsfs_Handle *h = NULL;
 805         int retVal = 0;
 806
 807         yaffsfs_Lock();
 808
 809         h = yaffsfs_GetHandlePointer(fd);
 810
 811         if(h && h->useCount > 0) {
 812                 /* clean up */
 813                 yaffs_flush_file(yaffsfs_inode[h->inodeId].iObj,1,0);
 814                 yaffsfs_PutHandle(fd);
 815                 retVal = 0;
 816         } else {
 817                 /* bad handle */
 818                 yaffsfs_SetError(-EBADF);
 819                 retVal = -1;
 820         }
 821
 822         yaffsfs_Unlock();
 823
 824         return retVal;
 825 }
 826
 827
 828
 829 int yaffsfs_do_read(int fd, void *vbuf, unsigned int nbyte, int isPread, int offset)
 830 {
 831         yaffsfs_Handle *h = NULL;
 832         struct yaffs_obj *obj = NULL;
 833         int pos = 0;
 834         int startPos = 0;
 835         int nRead = 0;
 836         int nToRead = 0;
 837         int totalRead = 0;
 838         unsigned int maxRead;
 839         u8 *buf = (u8 *)vbuf;
 840
 841         yaffsfs_Lock();
 842         h = yaffsfs_GetHandlePointer(fd);
 843         obj = yaffsfs_GetHandleObject(fd);
 844
 845         if(!h || !obj){
 846                 /* bad handle */
 847                 yaffsfs_SetError(-EBADF);
 848                 totalRead = -1;
 849         } else if(!h->reading){
 850                 /* Not a reading handle */
 851                 yaffsfs_SetError(-EINVAL);
 852                 totalRead = -1;
 853         } else {
 854                 if(isPread)
 855                         startPos = offset;
 856                 else
 857                         startPos = h->position;
 858
 859                 pos = startPos;
 860
 861                 if(yaffs_get_obj_length(obj) > pos)
 862                         maxRead = yaffs_get_obj_length(obj) - pos;
 863                 else
 864                         maxRead = 0;
 865
 866                 if(nbyte > maxRead)
 867                         nbyte = maxRead;
 868
 869
 870                 yaffsfs_GetHandle(fd);
 871
 872                 while(nbyte > 0) {
 873                         nToRead = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
 874                         if(nToRead > nbyte)
 875                                 nToRead = nbyte;
 876                         nRead = yaffs_file_rd(obj,buf,pos,nToRead);
 877
 878                         if(nRead > 0){
 879                                 totalRead += nRead;
 880                                 pos += nRead;
 881                                 buf += nRead;
 882                         }
 883
 884                         if(nRead == nToRead)
 885                                 nbyte-=nRead;
 886                         else
 887                                 nbyte = 0; /* no more to read */
 888
 889
 890                         if(nbyte > 0){
 891                                 yaffsfs_Unlock();
 892                                 yaffsfs_Lock();
 893                         }
 894
 895                 }
 896
 897                 yaffsfs_PutHandle(fd);
 898
 899                 if(!isPread) {
 900                         if(totalRead >= 0)
 901                                 h->position = startPos + totalRead;
 902                         else {
 903                                         /* todo error */
 904                         }
 905                 }
 906
 907         }
 908
 909         yaffsfs_Unlock();
 910
 911         return (totalRead >= 0) ? totalRead : -1;
 912
 913 }
 914
 915 int yaffs_read(int fd, void *buf, unsigned int nbyte)
 916 {
 917         return yaffsfs_do_read(fd, buf, nbyte, 0, 0);
 918 }
 919
 920 int yaffs_pread(int fd, void *buf, unsigned int nbyte, unsigned int offset)
 921 {
 922         return yaffsfs_do_read(fd, buf, nbyte, 1, offset);
 923 }
 924
 925 int yaffsfs_do_write(int fd, const void *vbuf, unsigned int nbyte, int isPwrite, int offset)
 926 {
 927         yaffsfs_Handle *h = NULL;
 928         struct yaffs_obj *obj = NULL;
 929         int pos = 0;
 930         int startPos = 0;
 931         int nWritten = 0;
 932         int totalWritten = 0;
 933         int write_trhrough = 0;
 934         int nToWrite = 0;
 935         const u8 *buf = (const u8 *)vbuf;
 936
 937         yaffsfs_Lock();
 938         h = yaffsfs_GetHandlePointer(fd);
 939         obj = yaffsfs_GetHandleObject(fd);
 940
 941         if(!h || !obj){
 942                 /* bad handle */
 943                 yaffsfs_SetError(-EBADF);
 944                 totalWritten = -1;
 945         } else if( h && obj && (!h->writing || obj->my_dev->read_only)){
 946                 yaffsfs_SetError(-EINVAL);
 947                 totalWritten=-1;
 948         } else {
 949                 if(h->append)
 950                         startPos = yaffs_get_obj_length(obj);
 951                 else if(isPwrite)
 952                         startPos = offset;
 953                 else
 954                         startPos = h->position;
 955
 956                 yaffsfs_GetHandle(fd);
 957                 pos = startPos;
 958                 while(nbyte > 0) {
 959                         nToWrite = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
 960                         if(nToWrite > nbyte)
 961                                 nToWrite = nbyte;
 962
 963                         nWritten = yaffs_wr_file(obj,buf,pos,nToWrite,write_trhrough);
 964                         if(nWritten > 0){
 965                                 totalWritten += nWritten;
 966                                 pos += nWritten;
 967                                 buf += nWritten;
 968                         }
 969
 970                         if(nWritten == nToWrite)
 971                                 nbyte -= nToWrite;
 972                         else
 973                                 nbyte = 0;
 974
 975                         if(nWritten < 1 && totalWritten < 1){
 976                                 yaffsfs_SetError(-ENOSPC);
 977                                 totalWritten = -1;
 978                         }
 979
 980                         if(nbyte > 0){
 981                                 yaffsfs_Unlock();
 982                                 yaffsfs_Lock();
 983                         }
 984                 }
 985
 986                 yaffsfs_PutHandle(fd);
 987
 988                 if(!isPwrite){
 989                         if(totalWritten > 0)
 990                                 h->position = startPos + totalWritten;
 991                         else {
 992                                 /* todo error */
 993                         }
 994                 }
 995         }
 996
 997         yaffsfs_Unlock();
 998
 999         return (totalWritten >= 0) ? totalWritten : -1;
1000 }
1001
1002 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
1003 {
1004         return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
1005 }
1006
1007 int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, unsigned int offset)
1008 {
1009         return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
1010 }
1011
1012
1013 int yaffs_truncate(const YCHAR *path,off_t new_size)
1014 {
1015         struct yaffs_obj *obj = NULL;
1016         int result = YAFFS_FAIL;
1017
1018         yaffsfs_Lock();
1019
1020         obj = yaffsfs_FindObject(NULL,path,0,1);
1021
1022         if(!obj)
1023                 yaffsfs_SetError(-ENOENT);
1024         else if(obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
1025                 yaffsfs_SetError(-EISDIR);
1026         else if(obj->my_dev->read_only)
1027                 yaffsfs_SetError(-EINVAL);
1028         else
1029                 result = yaffs_resize_file(obj,new_size);
1030
1031         yaffsfs_Unlock();
1032
1033
1034         return (result) ? 0 : -1;
1035 }
1036
1037 int yaffs_ftruncate(int fd, off_t new_size)
1038 {
1039         yaffsfs_Handle *h = NULL;
1040         struct yaffs_obj *obj = NULL;
1041         int result = 0;
1042
1043         yaffsfs_Lock();
1044         h = yaffsfs_GetHandlePointer(fd);
1045         obj = yaffsfs_GetHandleObject(fd);
1046
1047         if(!h || !obj)
1048                 /* bad handle */
1049                 yaffsfs_SetError(-EBADF);
1050         else if(obj->my_dev->read_only)
1051                 yaffsfs_SetError(-EINVAL);
1052         else
1053                 /* resize the file */
1054                 result = yaffs_resize_file(obj,new_size);
1055         yaffsfs_Unlock();
1056
1057
1058         return (result) ? 0 : -1;
1059
1060 }
1061
1062 off_t yaffs_lseek(int fd, off_t offset, int whence)
1063 {
1064         yaffsfs_Handle *h = NULL;
1065         struct yaffs_obj *obj = NULL;
1066         int pos = -1;
1067         int fSize = -1;
1068
1069         yaffsfs_Lock();
1070         h = yaffsfs_GetHandlePointer(fd);
1071         obj = yaffsfs_GetHandleObject(fd);
1072
1073         if(!h || !obj){
1074                 /* bad handle */
1075                 yaffsfs_SetError(-EBADF);
1076         } else {
1077                 if(whence == SEEK_SET){
1078                         if(offset >= 0)
1079                                 pos = offset;
1080                 } else if(whence == SEEK_CUR) {
1081                         if( (h->position + offset) >= 0)
1082                                 pos = (h->position + offset);
1083                 } else if(whence == SEEK_END) {
1084                         fSize = yaffs_get_obj_length(obj);
1085                         if(fSize >= 0 && (fSize + offset) >= 0)
1086                                 pos = fSize + offset;
1087                 }
1088
1089                 if(pos >= 0)
1090                         h->position = pos;
1091                 else
1092                         yaffsfs_SetError(-EINVAL);
1093         }
1094
1095         yaffsfs_Unlock();
1096
1097         return pos;
1098 }
1099
1100
1101 int yaffsfs_DoUnlink(const YCHAR *path,int isDirectory)
1102 {
1103         struct yaffs_obj *dir = NULL;
1104         struct yaffs_obj *obj = NULL;
1105         YCHAR *name;
1106         int result = YAFFS_FAIL;
1107
1108         yaffsfs_Lock();
1109
1110         obj = yaffsfs_FindObject(NULL,path,0,0);
1111         dir = yaffsfs_FindDirectory(NULL,path,&name,0);
1112         if(!dir)
1113                 yaffsfs_SetError(-ENOTDIR);
1114         else if(!obj)
1115                 yaffsfs_SetError(-ENOENT);
1116         else if(obj->my_dev->read_only)
1117                 yaffsfs_SetError(-EINVAL);
1118         else if(!isDirectory && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
1119                 yaffsfs_SetError(-EISDIR);
1120         else if(isDirectory && obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1121                 yaffsfs_SetError(-ENOTDIR);
1122         else {
1123                 result = yaffs_unlinker(dir,name);
1124
1125                 if(result == YAFFS_FAIL && isDirectory)
1126                         yaffsfs_SetError(-ENOTEMPTY);
1127         }
1128
1129         yaffsfs_Unlock();
1130
1131         /* todo error */
1132
1133         return (result == YAFFS_FAIL) ? -1 : 0;
1134 }
1135
1136
1137 int yaffs_rmdir(const YCHAR *path)
1138 {
1139         return yaffsfs_DoUnlink(path,1);
1140 }
1141
1142 int yaffs_unlink(const YCHAR *path)
1143 {
1144         return yaffsfs_DoUnlink(path,0);
1145 }
1146
1147 int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
1148 {
1149         struct yaffs_obj *olddir = NULL;
1150         struct yaffs_obj *newdir = NULL;
1151         struct yaffs_obj *obj = NULL;
1152         YCHAR *oldname;
1153         YCHAR *newname;
1154         int result= YAFFS_FAIL;
1155         int rename_allowed = 1;
1156
1157         yaffsfs_Lock();
1158
1159         olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
1160         newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
1161         obj = yaffsfs_FindObject(NULL,oldPath,0,0);
1162
1163         if(!olddir || !newdir || !obj) {
1164                 /* bad file */
1165                 yaffsfs_SetError(-EBADF);
1166                 rename_allowed = 0;
1167         } else if(obj->my_dev->read_only){
1168                 yaffsfs_SetError(-EINVAL);
1169                 rename_allowed = 0;
1170         } else if(olddir->my_dev != newdir->my_dev) {
1171                 /* oops must be on same device */
1172                 /* todo error */
1173                 yaffsfs_SetError(-EXDEV);
1174                 rename_allowed = 0;
1175         } else if(obj && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
1176                 /*
1177                  * It is a directory, check that it is not being renamed to
1178                  * being its own decendent.
1179                  * Do this by tracing from the new directory back to the root, checking for obj
1180                  */
1181
1182                 struct yaffs_obj *xx = newdir;
1183
1184                 while( rename_allowed && xx){
1185                         if(xx == obj)
1186                                 rename_allowed = 0;
1187                         xx = xx->parent;
1188                 }
1189                 if(!rename_allowed)
1190                         yaffsfs_SetError(-EACCES);
1191         }
1192
1193         if(rename_allowed)
1194                 result = yaffs_rename_obj(olddir,oldname,newdir,newname);
1195
1196         yaffsfs_Unlock();
1197
1198         return (result == YAFFS_FAIL) ? -1 : 0;
1199 }
1200
1201
1202 static int yaffsfs_DoStat(struct yaffs_obj *obj,struct yaffs_stat *buf)
1203 {
1204         int retVal = -1;
1205
1206         obj = yaffs_get_equivalent_obj(obj);
1207
1208         if(obj && buf){
1209                 buf->st_dev = (int)obj->my_dev->os_context;
1210                 buf->st_ino = obj->obj_id;
1211                 buf->st_mode = obj->yst_mode & ~S_IFMT; /* clear out file type bits */
1212
1213                 if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
1214                         buf->st_mode |= S_IFDIR;
1215                 else if(obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
1216                         buf->st_mode |= S_IFLNK;
1217                 else if(obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
1218                         buf->st_mode |= S_IFREG;
1219
1220                 buf->st_nlink = yaffs_get_obj_link_count(obj);
1221                 buf->st_uid = 0;
1222                 buf->st_gid = 0;;
1223                 buf->st_rdev = obj->yst_rdev;
1224                 buf->st_size = yaffs_get_obj_length(obj);
1225                 buf->st_blksize = obj->my_dev->data_bytes_per_chunk;
1226                 buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
1227 #if CONFIG_YAFFS_WINCE
1228                 buf->yst_wince_atime[0] = obj->win_atime[0];
1229                 buf->yst_wince_atime[1] = obj->win_atime[1];
1230                 buf->yst_wince_ctime[0] = obj->win_ctime[0];
1231                 buf->yst_wince_ctime[1] = obj->win_ctime[1];
1232                 buf->yst_wince_mtime[0] = obj->win_mtime[0];
1233                 buf->yst_wince_mtime[1] = obj->win_mtime[1];
1234 #else
1235                 buf->yst_atime = obj->yst_atime;
1236                 buf->yst_ctime = obj->yst_ctime;
1237                 buf->yst_mtime = obj->yst_mtime;
1238 #endif
1239                 retVal = 0;
1240         }
1241         return retVal;
1242 }
1243
1244 static int yaffsfs_DoStatOrLStat(const YCHAR *path, struct yaffs_stat *buf,int doLStat)
1245 {
1246         struct yaffs_obj *obj;
1247
1248         int retVal = -1;
1249
1250         yaffsfs_Lock();
1251
1252         obj = yaffsfs_FindObject(NULL,path,0,1);
1253
1254         if(!doLStat && obj)
1255                 obj = yaffsfs_FollowLink(obj,0);
1256
1257         if(obj)
1258                 retVal = yaffsfs_DoStat(obj,buf);
1259         else
1260                 /* todo error not found */
1261                 yaffsfs_SetError(-ENOENT);
1262
1263         yaffsfs_Unlock();
1264
1265         return retVal;
1266
1267 }
1268
1269 int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
1270 {
1271         return yaffsfs_DoStatOrLStat(path,buf,0);
1272 }
1273
1274 int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
1275 {
1276         return yaffsfs_DoStatOrLStat(path,buf,1);
1277 }
1278
1279 int yaffs_fstat(int fd, struct yaffs_stat *buf)
1280 {
1281         struct yaffs_obj *obj;
1282
1283         int retVal = -1;
1284
1285         yaffsfs_Lock();
1286         obj = yaffsfs_GetHandleObject(fd);
1287
1288         if(obj)
1289                 retVal = yaffsfs_DoStat(obj,buf);
1290         else
1291                 /* bad handle */
1292                 yaffsfs_SetError(-EBADF);
1293
1294         yaffsfs_Unlock();
1295
1296         return retVal;
1297 }
1298
1299 #ifndef CONFIG_YAFFS_WINCE
1300 /* xattrib functions */
1301
1302
1303 static int yaffs_do_setxattr(const YCHAR *path, const char *name, const void *data, int size, int flags, int follow)
1304 {
1305         struct yaffs_obj *obj;
1306
1307         int retVal = -1;
1308
1309         yaffsfs_Lock();
1310
1311         obj = yaffsfs_FindObject(NULL,path,0,1);
1312
1313         if(follow)
1314                 obj = yaffsfs_FollowLink(obj,0);
1315
1316         if(obj) {
1317                 retVal = yaffs_set_xattrib(obj,name,data,size,flags);
1318                 if(retVal< 0){
1319                         yaffsfs_SetError(retVal);
1320                         retVal = -1;
1321                 }
1322         } else
1323                 /* todo error not found */
1324                 yaffsfs_SetError(-ENOENT);
1325
1326         yaffsfs_Unlock();
1327
1328         return retVal;
1329
1330 }
1331
1332 int yaffs_setxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1333 {
1334         return yaffs_do_setxattr(path, name, data, size, flags, 1);
1335 }
1336
1337 int yaffs_lsetxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1338 {
1339         return yaffs_do_setxattr(path, name, data, size, flags, 0);
1340 }
1341
1342
1343
1344 int yaffs_fsetxattr(int fd, const char *name, const void *data, int size, int flags)
1345 {
1346         struct yaffs_obj *obj;
1347
1348         int retVal = -1;
1349
1350         yaffsfs_Lock();
1351         obj = yaffsfs_GetHandleObject(fd);
1352
1353         if(obj) {
1354                 retVal = yaffs_set_xattrib(obj,name,data,size,flags);
1355                 if(retVal< 0){
1356                         yaffsfs_SetError(retVal);
1357                         retVal = -1;
1358                 }
1359         } else
1360                 /* bad handle */
1361                 yaffsfs_SetError(-EBADF);
1362
1363         yaffsfs_Unlock();
1364
1365         return retVal;
1366 }
1367
1368 static int yaffs_do_getxattr(const YCHAR *path, const char *name, void *data, int size, int follow)
1369 {
1370         struct yaffs_obj *obj;
1371
1372         int retVal = -1;
1373
1374         yaffsfs_Lock();
1375
1376         obj = yaffsfs_FindObject(NULL,path,0,1);
1377
1378         if(follow)
1379                 obj = yaffsfs_FollowLink(obj,0);
1380
1381         if(obj) {
1382                 retVal = yaffs_get_xattrib(obj,name,data,size);
1383                 if(retVal< 0){
1384                         yaffsfs_SetError(retVal);
1385                         retVal = -1;
1386                 }
1387         } else
1388                 /* todo error not found */
1389                 yaffsfs_SetError(-ENOENT);
1390
1391         yaffsfs_Unlock();
1392
1393         return retVal;
1394
1395 }
1396
1397 int yaffs_getxattr(const YCHAR *path, const char *name, void *data, int size)
1398 {
1399         return yaffs_do_getxattr( path, name, data, size, 1);
1400 }
1401 int yaffs_lgetxattr(const YCHAR *path, const char *name, void *data, int size)
1402 {
1403         return yaffs_do_getxattr( path, name, data, size, 0);
1404 }
1405
1406
1407
1408 int yaffs_fgetxattr(int fd, const char *name, void *data, int size)
1409 {
1410         struct yaffs_obj *obj;
1411
1412         int retVal = -1;
1413
1414         yaffsfs_Lock();
1415         obj = yaffsfs_GetHandleObject(fd);
1416
1417         if(obj) {
1418                 retVal = yaffs_get_xattrib(obj,name,data,size);
1419                 if(retVal< 0){
1420                         yaffsfs_SetError(retVal);
1421                         retVal = -1;
1422                 }
1423         } else
1424                 /* bad handle */
1425                 yaffsfs_SetError(-EBADF);
1426
1427         yaffsfs_Unlock();
1428
1429         return retVal;
1430 }
1431
1432 static int yaffs_do_listxattr(const YCHAR *path, char *data, int size, int follow)
1433 {
1434         struct yaffs_obj *obj;
1435
1436         int retVal = -1;
1437
1438         yaffsfs_Lock();
1439
1440         obj = yaffsfs_FindObject(NULL,path,0,1);
1441
1442         if(follow)
1443                 obj = yaffsfs_FollowLink(obj,0);
1444
1445         if(obj) {
1446                 retVal = yaffs_list_xattrib(obj, data,size);
1447                 if(retVal< 0){
1448                         yaffsfs_SetError(retVal);
1449                         retVal = -1;
1450                 }
1451         } else
1452                 /* todo error not found */
1453                 yaffsfs_SetError(-ENOENT);
1454
1455         yaffsfs_Unlock();
1456
1457         return retVal;
1458
1459 }
1460
1461 int yaffs_listxattr(const YCHAR *path, char *data, int size)
1462 {
1463         return yaffs_do_listxattr(path, data, size, 1);
1464 }
1465
1466 int yaffs_llistxattr(const YCHAR *path, char *data, int size)
1467 {
1468         return yaffs_do_listxattr(path, data, size, 0);
1469 }
1470
1471 int yaffs_flistxattr(int fd, char *data, int size)
1472 {
1473         struct yaffs_obj *obj;
1474
1475         int retVal = -1;
1476
1477         yaffsfs_Lock();
1478         obj = yaffsfs_GetHandleObject(fd);
1479
1480         if(obj) {
1481                 retVal = yaffs_list_xattrib(obj,data,size);
1482                 if(retVal< 0){
1483                         yaffsfs_SetError(retVal);
1484                         retVal = -1;
1485                 }
1486         } else
1487                 /* bad handle */
1488                 yaffsfs_SetError(-EBADF);
1489
1490         yaffsfs_Unlock();
1491
1492         return retVal;
1493 }
1494
1495 static int yaffs_do_removexattr(const YCHAR *path, const char *name, int follow)
1496 {
1497         struct yaffs_obj *obj;
1498
1499         int retVal = -1;
1500
1501         yaffsfs_Lock();
1502
1503         obj = yaffsfs_FindObject(NULL,path,0,1);
1504
1505         if(follow)
1506                 obj = yaffsfs_FollowLink(obj,0);
1507
1508         if(obj) {
1509                 retVal = yaffs_remove_xattrib(obj,name);
1510                 if(retVal< 0){
1511                         yaffsfs_SetError(retVal);
1512                         retVal = -1;
1513                 }
1514         } else
1515                 /* todo error not found */
1516                 yaffsfs_SetError(-ENOENT);
1517
1518         yaffsfs_Unlock();
1519
1520         return retVal;
1521
1522 }
1523
1524 int yaffs_removexattr(const YCHAR *path, const char *name)
1525 {
1526         return yaffs_do_removexattr(path, name, 1);
1527 }
1528
1529 int yaffs_lremovexattr(const YCHAR *path, const char *name)
1530 {
1531         return yaffs_do_removexattr(path, name, 0);
1532 }
1533
1534 int yaffs_fremovexattr(int fd, const char *name)
1535 {
1536         struct yaffs_obj *obj;
1537
1538         int retVal = -1;
1539
1540         yaffsfs_Lock();
1541         obj = yaffsfs_GetHandleObject(fd);
1542
1543         if(obj){
1544                 retVal = yaffs_remove_xattrib(obj,name);
1545                 if(retVal< 0){
1546                         yaffsfs_SetError(retVal);
1547                         retVal = -1;
1548                 }
1549         }else
1550                 /* bad handle */
1551                 yaffsfs_SetError(-EBADF);
1552
1553         yaffsfs_Unlock();
1554
1555         return retVal;
1556 }
1557 #endif
1558
1559 #ifdef CONFIG_YAFFS_WINCE
1560 int yaffs_get_wince_times(int fd, unsigned *wctime, unsigned *watime, unsigned *wmtime)
1561 {
1562         struct yaffs_obj *obj;
1563
1564         int retVal = -1;
1565
1566         yaffsfs_Lock();
1567         obj = yaffsfs_GetHandleObject(fd);
1568
1569         if(obj){
1570
1571                 if(wctime){
1572                         wctime[0] = obj->win_ctime[0];
1573                         wctime[1] = obj->win_ctime[1];
1574                 }
1575                 if(watime){
1576                         watime[0] = obj->win_atime[0];
1577                         watime[1] = obj->win_atime[1];
1578                 }
1579                 if(wmtime){
1580                         wmtime[0] = obj->win_mtime[0];
1581                         wmtime[1] = obj->win_mtime[1];
1582                 }
1583
1584
1585                 retVal = 0;
1586         } else
1587                 /*  bad handle */
1588                 yaffsfs_SetError(-EBADF);
1589
1590         yaffsfs_Unlock();
1591
1592         return retVal;
1593 }
1594
1595
1596 int yaffs_set_wince_times(int fd,
1597                                                   const unsigned *wctime,
1598                                                   const unsigned *watime,
1599                                                   const unsigned *wmtime)
1600 {
1601         struct yaffs_obj *obj;
1602         int result;
1603         int retVal = -1;
1604
1605         yaffsfs_Lock();
1606         obj = yaffsfs_GetHandleObject(fd);
1607
1608         if(obj){
1609
1610                 if(wctime){
1611                         obj->win_ctime[0] = wctime[0];
1612                         obj->win_ctime[1] = wctime[1];
1613                 }
1614                 if(watime){
1615                         obj->win_atime[0] = watime[0];
1616                         obj->win_atime[1] = watime[1];
1617                 }
1618                 if(wmtime){
1619                         obj->win_mtime[0] = wmtime[0];
1620                         obj->win_mtime[1] = wmtime[1];
1621                 }
1622
1623                 obj->dirty = 1;
1624                 result = yaffs_flush_file(obj,0,0);
1625                 retVal = 0;
1626         } else
1627                 /* bad handle */
1628                 yaffsfs_SetError(-EBADF);
1629
1630         yaffsfs_Unlock();
1631
1632         return retVal;
1633 }
1634
1635 #endif
1636
1637
1638 static int yaffsfs_DoChMod(struct yaffs_obj *obj,mode_t mode)
1639 {
1640         int result = -1;
1641
1642         if(obj)
1643                 obj = yaffs_get_equivalent_obj(obj);
1644
1645         if(obj) {
1646                 obj->yst_mode = mode;
1647                 obj->dirty = 1;
1648                 result = yaffs_flush_file(obj,0,0);
1649         }
1650
1651         return result == YAFFS_OK ? 0 : -1;
1652 }
1653
1654
1655 int yaffs_access(const YCHAR *path, int amode)
1656 {
1657         struct yaffs_obj *obj;
1658
1659         int retval = 0;
1660
1661         yaffsfs_Lock();
1662
1663         obj = yaffsfs_FindObject(NULL,path,0,1);
1664
1665         if(obj) {
1666                 int access_ok = 1;
1667
1668                 if((amode & R_OK) && !(obj->yst_mode & S_IREAD))
1669                         access_ok = 0;
1670                 if((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
1671                         access_ok = 0;
1672                 if((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
1673                         access_ok = 0;
1674
1675                 if(!access_ok) {
1676                         yaffsfs_SetError(-EACCES);
1677                         retval = -1;
1678                 }
1679         } else {
1680                 /* todo error not found */
1681                 yaffsfs_SetError(-ENOENT);
1682                 retval = -1;
1683         }
1684
1685         yaffsfs_Unlock();
1686
1687         return retval;
1688
1689 }
1690
1691
1692 int yaffs_chmod(const YCHAR *path, mode_t mode)
1693 {
1694         struct yaffs_obj *obj;
1695
1696         int retVal = -1;
1697
1698         yaffsfs_Lock();
1699
1700         obj = yaffsfs_FindObject(NULL,path,0,1);
1701
1702         if(!obj)
1703                 yaffsfs_SetError(-ENOENT);
1704         else if(obj->my_dev->read_only)
1705                 yaffsfs_SetError(-EINVAL);
1706         else
1707                 retVal = yaffsfs_DoChMod(obj,mode);
1708
1709         yaffsfs_Unlock();
1710
1711         return retVal;
1712
1713 }
1714
1715
1716 int yaffs_fchmod(int fd, mode_t mode)
1717 {
1718         struct yaffs_obj *obj;
1719
1720         int retVal = -1;
1721
1722         yaffsfs_Lock();
1723         obj = yaffsfs_GetHandleObject(fd);
1724
1725         if(!obj)
1726                 yaffsfs_SetError(-ENOENT);
1727         else if(obj->my_dev->read_only)
1728                 yaffsfs_SetError(-EINVAL);
1729         else
1730                 retVal = yaffsfs_DoChMod(obj,mode);
1731
1732         yaffsfs_Unlock();
1733
1734         return retVal;
1735 }
1736
1737
1738 int yaffs_mkdir(const YCHAR *path, mode_t mode)
1739 {
1740         struct yaffs_obj *parent = NULL;
1741         struct yaffs_obj *dir = NULL;
1742         YCHAR *name;
1743         YCHAR *use_path = NULL;
1744         int path_length = 0;
1745         int retVal= -1;
1746         int i;
1747
1748
1749         /*
1750          * We don't have a definition for max path length.
1751          * We will use 3 * max name length instead.
1752          */
1753
1754         path_length = strnlen(path,(YAFFS_MAX_NAME_LENGTH+1)*3 +1);
1755
1756         /* If the last character is a path divider, then we need to
1757          * trim it back so that the name look-up works properly.
1758          * eg. /foo/new_dir/ -> /foo/newdir
1759          * Curveball: Need to handle multiple path dividers:
1760          * eg. /foof/sdfse///// -> /foo/sdfse
1761          */
1762         if(path_length > 0 &&
1763                 yaffsfs_IsPathDivider(path[path_length-1])){
1764                 use_path = YMALLOC(path_length + 1);
1765                 if(!use_path){
1766                         yaffsfs_SetError(-ENOMEM);
1767                         return -1;
1768                 }
1769                 strcpy(use_path, path);
1770                 for(i = path_length-1;
1771                         i >= 0 && yaffsfs_IsPathDivider(use_path[i]);
1772                         i--)
1773                         use_path[i] = (YCHAR) 0;
1774                 path = use_path;
1775         }
1776
1777         yaffsfs_Lock();
1778         parent = yaffsfs_FindDirectory(NULL,path,&name,0);
1779         if(parent && yaffs_strnlen(name,5) == 0){
1780                 /* Trying to make the root itself */
1781                 yaffsfs_SetError(-EEXIST);
1782         } else if(parent && parent->my_dev->read_only){
1783                 yaffsfs_SetError(-EINVAL);
1784         } else {
1785                 if(parent)
1786                         dir = yaffs_create_dir(parent,name,mode,0,0);
1787                 if(dir)
1788                         retVal = 0;
1789                 else {
1790                         if(!parent)
1791                                 yaffsfs_SetError(-ENOENT); /* missing path */
1792                         else if (yaffs_find_by_name(parent,name))
1793                                 yaffsfs_SetError(-EEXIST); /* the name already exists */
1794                         else
1795                                 yaffsfs_SetError(-ENOSPC); /* just assume no space */
1796                         retVal = -1;
1797                 }
1798         }
1799
1800         yaffsfs_Unlock();
1801
1802         if(use_path)
1803                 YFREE(use_path);
1804
1805         return retVal;
1806 }
1807
1808 void * yaffs_getdev(const YCHAR *path)
1809 {
1810         struct yaffs_dev *dev=NULL;
1811         YCHAR *dummy;
1812         dev = yaffsfs_FindDevice(path,&dummy);
1813         return (void *)dev;
1814 }
1815
1816 int yaffs_mount2(const YCHAR *path,int read_only)
1817 {
1818         int retVal=-1;
1819         int result=YAFFS_FAIL;
1820         struct yaffs_dev *dev=NULL;
1821         YCHAR *dummy;
1822
1823         T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Mounting %s" TENDSTR),path));
1824
1825         yaffsfs_Lock();
1826
1827         yaffsfs_InitHandles();
1828
1829         dev = yaffsfs_FindDevice(path,&dummy);
1830         if(dev){
1831                 if(!dev->is_mounted){
1832                         dev->read_only = read_only ? 1 : 0;
1833                         result = yaffs_guts_initialise(dev);
1834                         if(result == YAFFS_FAIL)
1835                                 /* todo error - mount failed */
1836                                 yaffsfs_SetError(-ENOMEM);
1837                         retVal = result ? 0 : -1;
1838
1839                 }
1840                 else
1841                         /* todo error - already mounted. */
1842                         yaffsfs_SetError(-EBUSY);
1843         } else
1844                 /* todo error - no device */
1845                 yaffsfs_SetError(-ENODEV);
1846
1847         yaffsfs_Unlock();
1848         return retVal;
1849
1850 }
1851
1852 int yaffs_mount(const YCHAR *path)
1853 {
1854         return yaffs_mount2(path,0);
1855 }
1856
1857 int yaffs_sync(const YCHAR *path)
1858 {
1859         int retVal=-1;
1860         struct yaffs_dev *dev=NULL;
1861         YCHAR *dummy;
1862
1863         yaffsfs_Lock();
1864         dev = yaffsfs_FindDevice(path,&dummy);
1865         if(dev){
1866                 if(dev->is_mounted){
1867
1868                         yaffs_flush_whole_cache(dev);
1869                         yaffs_checkpoint_save(dev);
1870                         retVal = 0;
1871
1872                 } else
1873                         /* todo error - not mounted. */
1874                         yaffsfs_SetError(-EINVAL);
1875
1876         }else
1877                 /* todo error - no device */
1878                 yaffsfs_SetError(-ENODEV);
1879
1880         yaffsfs_Unlock();
1881         return retVal;
1882 }
1883
1884
1885 int yaffs_remount(const YCHAR *path, int force, int read_only)
1886 {
1887         int retVal=-1;
1888         struct yaffs_dev *dev=NULL;
1889         YCHAR *dummy;
1890
1891         yaffsfs_Lock();
1892         dev = yaffsfs_FindDevice(path,&dummy);
1893         if(dev){
1894                 if(dev->is_mounted){
1895                         int i;
1896                         int inUse;
1897
1898                         yaffs_flush_whole_cache(dev);
1899
1900                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse && !force; i++){
1901                                 if(yaffsfs_handle[i].useCount>0 && yaffsfs_inode[yaffsfs_handle[i].inodeId].iObj->my_dev == dev)
1902                                         inUse = 1; /* the device is in use, can't unmount */
1903                         }
1904
1905                         if(!inUse || force){
1906                                 if(read_only)
1907                                         yaffs_checkpoint_save(dev);
1908                                 dev->read_only =  read_only ? 1 : 0;
1909                                 retVal = 0;
1910                         } else
1911                                 yaffsfs_SetError(-EBUSY);
1912
1913                 } else
1914                         yaffsfs_SetError(-EINVAL);
1915
1916         }
1917         else
1918                 yaffsfs_SetError(-ENODEV);
1919
1920         yaffsfs_Unlock();
1921         return retVal;
1922
1923 }
1924
1925 int yaffs_unmount2(const YCHAR *path, int force)
1926 {
1927         int retVal=-1;
1928         struct yaffs_dev *dev=NULL;
1929         YCHAR *dummy;
1930
1931         yaffsfs_Lock();
1932         dev = yaffsfs_FindDevice(path,&dummy);
1933         if(dev){
1934                 if(dev->is_mounted){
1935                         int i;
1936                         int inUse;
1937
1938                         yaffs_flush_whole_cache(dev);
1939                         yaffs_checkpoint_save(dev);
1940
1941                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++){
1942                                 if(yaffsfs_handle[i].useCount > 0 && yaffsfs_inode[yaffsfs_handle[i].inodeId].iObj->my_dev == dev)
1943                                         inUse = 1; /* the device is in use, can't unmount */
1944                         }
1945
1946                         if(!inUse || force){
1947                                 yaffs_deinitialise(dev);
1948
1949                                 retVal = 0;
1950                         } else
1951                                 /* todo error can't unmount as files are open */
1952                                 yaffsfs_SetError(-EBUSY);
1953
1954                 } else
1955                         /* todo error - not mounted. */
1956                         yaffsfs_SetError(-EINVAL);
1957
1958         }
1959         else
1960                 /* todo error - no device */
1961                 yaffsfs_SetError(-ENODEV);
1962
1963         yaffsfs_Unlock();
1964         return retVal;
1965
1966 }
1967
1968 int yaffs_unmount(const YCHAR *path)
1969 {
1970         return yaffs_unmount2(path,0);
1971 }
1972
1973 loff_t yaffs_freespace(const YCHAR *path)
1974 {
1975         loff_t retVal=-1;
1976         struct yaffs_dev *dev=NULL;
1977         YCHAR *dummy;
1978
1979         yaffsfs_Lock();
1980         dev = yaffsfs_FindDevice(path,&dummy);
1981         if(dev  && dev->is_mounted){
1982                 retVal = yaffs_get_n_free_chunks(dev);
1983                 retVal *= dev->data_bytes_per_chunk;
1984
1985         } else
1986                 yaffsfs_SetError(-EINVAL);
1987
1988         yaffsfs_Unlock();
1989         return retVal;
1990 }
1991
1992 loff_t yaffs_totalspace(const YCHAR *path)
1993 {
1994         loff_t retVal=-1;
1995         struct yaffs_dev *dev=NULL;
1996         YCHAR *dummy;
1997
1998         yaffsfs_Lock();
1999         dev = yaffsfs_FindDevice(path,&dummy);
2000         if(dev  && dev->is_mounted){
2001                 retVal = (dev->param.end_block - dev->param.start_block + 1) - dev->param.n_reserved_blocks;
2002                 retVal *= dev->param.chunks_per_block;
2003                 retVal *= dev->data_bytes_per_chunk;
2004
2005         } else
2006                 yaffsfs_SetError(-EINVAL);
2007
2008         yaffsfs_Unlock();
2009         return retVal;
2010 }
2011
2012 int yaffs_inodecount(const YCHAR *path)
2013 {
2014         loff_t retVal= -1;
2015         struct yaffs_dev *dev=NULL;
2016         YCHAR *dummy;
2017
2018         yaffsfs_Lock();
2019         dev = yaffsfs_FindDevice(path,&dummy);
2020         if(dev  && dev->is_mounted) {
2021            int n_obj = dev->n_obj;
2022            if(n_obj > dev->n_hardlinks)
2023                 retVal = n_obj - dev->n_hardlinks;
2024         }
2025
2026         if(retVal < 0)
2027                 yaffsfs_SetError(-EINVAL);
2028
2029         yaffsfs_Unlock();
2030         return retVal;
2031 }
2032
2033
2034 void yaffs_add_device(struct yaffs_dev *dev)
2035 {
2036         dev->is_mounted = 0;
2037         dev->param.remove_obj_fn = yaffsfs_RemoveObjectCallback;
2038
2039         if(!dev->dev_list.next)
2040                 INIT_LIST_HEAD(&dev->dev_list);
2041
2042         list_add(&dev->dev_list,&yaffsfs_deviceList);
2043 }
2044
2045 void yaffs_remove_device(struct yaffs_dev *dev)
2046 {
2047         list_del_init(&dev->dev_list);
2048 }
2049
2050
2051
2052
2053 /* Directory search stuff. */
2054
2055 /*
2056  * Directory search context
2057  *
2058  * NB this is an opaque structure.
2059  */
2060
2061
2062 typedef struct
2063 {
2064         u32 magic;
2065         yaffs_dirent de;                /* directory entry being used by this dsc */
2066         YCHAR name[NAME_MAX+1];         /* name of directory being searched */
2067         struct yaffs_obj *dirObj;           /* ptr to directory being searched */
2068         struct yaffs_obj *nextReturn;       /* obj to be returned by next readddir */
2069         int offset;
2070         struct list_head others;
2071 } yaffsfs_DirectorySearchContext;
2072
2073
2074
2075 static struct list_head search_contexts;
2076
2077
2078 static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
2079 {
2080         if(dsc &&
2081            dsc->dirObj &&
2082            dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2083
2084            dsc->offset = 0;
2085
2086            if( list_empty(&dsc->dirObj->variant.dir_variant.children))
2087                 dsc->nextReturn = NULL;
2088            else
2089                 dsc->nextReturn = list_entry(dsc->dirObj->variant.dir_variant.children.next,
2090                                                 struct yaffs_obj,siblings);
2091         } else {
2092                 /* Hey someone isn't playing nice! */
2093         }
2094 }
2095
2096 static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
2097 {
2098         if(dsc &&
2099            dsc->dirObj &&
2100            dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2101
2102            if( dsc->nextReturn == NULL ||
2103                list_empty(&dsc->dirObj->variant.dir_variant.children))
2104                 dsc->nextReturn = NULL;
2105            else {
2106                    struct list_head *next = dsc->nextReturn->siblings.next;
2107
2108                    if( next == &dsc->dirObj->variant.dir_variant.children)
2109                         dsc->nextReturn = NULL; /* end of list */
2110                    else
2111                         dsc->nextReturn = list_entry(next,struct yaffs_obj,siblings);
2112            }
2113         } else {
2114                 /* Hey someone isn't playing nice! */
2115         }
2116 }
2117
2118 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj)
2119 {
2120
2121         struct list_head *i;
2122         yaffsfs_DirectorySearchContext *dsc;
2123
2124         /* if search contexts not initilised then skip */
2125         if(!search_contexts.next)
2126                 return;
2127
2128         /* Iterate through the directory search contexts.
2129          * If any are the one being removed, then advance the dsc to
2130          * the next one to prevent a hanging ptr.
2131          */
2132          list_for_each(i, &search_contexts) {
2133                 if (i) {
2134                         dsc = list_entry(i, yaffsfs_DirectorySearchContext,others);
2135                         if(dsc->nextReturn == obj)
2136                                 yaffsfs_DirAdvance(dsc);
2137                 }
2138         }
2139
2140 }
2141
2142 yaffs_DIR *yaffs_opendir(const YCHAR *dirname)
2143 {
2144         yaffs_DIR *dir = NULL;
2145         struct yaffs_obj *obj = NULL;
2146         yaffsfs_DirectorySearchContext *dsc = NULL;
2147
2148         yaffsfs_Lock();
2149
2150         obj = yaffsfs_FindObject(NULL,dirname,0,1);
2151
2152         if(obj && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2153
2154                 dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
2155                 dir = (yaffs_DIR *)dsc;
2156
2157                 if(dsc){
2158                         memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
2159                         dsc->magic = YAFFS_MAGIC;
2160                         dsc->dirObj = obj;
2161                         yaffs_strncpy(dsc->name,dirname,NAME_MAX);
2162                         INIT_LIST_HEAD(&dsc->others);
2163
2164                         if(!search_contexts.next)
2165                                 INIT_LIST_HEAD(&search_contexts);
2166
2167                         list_add(&dsc->others,&search_contexts);
2168                         yaffsfs_SetDirRewound(dsc);
2169                 }
2170
2171         }
2172
2173         yaffsfs_Unlock();
2174
2175         return dir;
2176 }
2177
2178 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
2179 {
2180         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2181         struct yaffs_dirent *retVal = NULL;
2182
2183         yaffsfs_Lock();
2184
2185         if(dsc && dsc->magic == YAFFS_MAGIC){
2186                 yaffsfs_SetError(0);
2187                 if(dsc->nextReturn){
2188                         dsc->de.d_ino = yaffs_get_equivalent_obj(dsc->nextReturn)->obj_id;
2189                         dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
2190                         dsc->de.d_off = dsc->offset++;
2191                         yaffs_get_obj_name(dsc->nextReturn,dsc->de.d_name,NAME_MAX);
2192                         if(yaffs_strnlen(dsc->de.d_name,NAME_MAX+1) == 0)
2193                         {
2194                                 /* this should not happen! */
2195                                 yaffs_strcpy(dsc->de.d_name,_Y("zz"));
2196                         }
2197                         dsc->de.d_reclen = sizeof(struct yaffs_dirent);
2198                         retVal = &dsc->de;
2199                         yaffsfs_DirAdvance(dsc);
2200                 } else
2201                         retVal = NULL;
2202         } else
2203                 yaffsfs_SetError(-EBADF);
2204
2205         yaffsfs_Unlock();
2206
2207         return retVal;
2208
2209 }
2210
2211
2212 void yaffs_rewinddir(yaffs_DIR *dirp)
2213 {
2214         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2215
2216         yaffsfs_Lock();
2217
2218         yaffsfs_SetDirRewound(dsc);
2219
2220         yaffsfs_Unlock();
2221 }
2222
2223
2224 int yaffs_closedir(yaffs_DIR *dirp)
2225 {
2226         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2227
2228         yaffsfs_Lock();
2229         dsc->magic = 0;
2230         list_del(&dsc->others); /* unhook from list */
2231         YFREE(dsc);
2232         yaffsfs_Unlock();
2233         return 0;
2234 }
2235
2236 /* End of directory stuff */
2237
2238
2239 int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath)
2240 {
2241         struct yaffs_obj *parent = NULL;
2242         struct yaffs_obj *obj;
2243         YCHAR *name;
2244         int retVal= -1;
2245         int mode = 0; /* ignore for now */
2246
2247         yaffsfs_Lock();
2248         parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
2249         if(parent && parent->my_dev->read_only)
2250                 yaffsfs_SetError(-EINVAL);
2251         else if(parent){
2252                 obj = yaffs_create_symlink(parent,name,mode,0,0,oldpath);
2253                 if(obj)
2254                         retVal = 0;
2255                 else{
2256                         yaffsfs_SetError(-ENOSPC); /* just assume no space for now */
2257                         retVal = -1;
2258                 }
2259         } else {
2260                 yaffsfs_SetError(-EINVAL);
2261                 retVal = -1;
2262         }
2263
2264         yaffsfs_Unlock();
2265
2266         return retVal;
2267
2268 }
2269
2270 int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz)
2271 {
2272         struct yaffs_obj *obj = NULL;
2273         int retVal;
2274
2275
2276         yaffsfs_Lock();
2277
2278         obj = yaffsfs_FindObject(NULL,path,0,1);
2279
2280         if(!obj) {
2281                 yaffsfs_SetError(-ENOENT);
2282                 retVal = -1;
2283         } else if(obj->variant_type != YAFFS_OBJECT_TYPE_SYMLINK) {
2284                 yaffsfs_SetError(-EINVAL);
2285                 retVal = -1;
2286         } else {
2287                 YCHAR *alias = obj->variant.symlink_variant.alias;
2288                 memset(buf,0,bufsiz);
2289                 yaffs_strncpy(buf,alias,bufsiz - 1);
2290                 retVal = 0;
2291         }
2292         yaffsfs_Unlock();
2293         return retVal;
2294 }
2295
2296 int yaffs_link(const YCHAR *oldpath, const YCHAR *newpath)
2297 {
2298         /* Creates a link called newpath to existing oldpath */
2299         struct yaffs_obj *obj = NULL;
2300         struct yaffs_obj *target = NULL;
2301         int retVal = 0;
2302         int new_nameLength = 0;
2303
2304
2305         yaffsfs_Lock();
2306
2307         obj = yaffsfs_FindObject(NULL,oldpath,0,1);
2308         target = yaffsfs_FindObject(NULL,newpath,0,0);
2309
2310         if(!obj) {
2311                 yaffsfs_SetError(-ENOENT);
2312                 retVal = -1;
2313         } else if(obj->my_dev->read_only){
2314                 yaffsfs_SetError(-EINVAL);
2315                 retVal= -1;
2316         } else if(target) {
2317                 yaffsfs_SetError(-EEXIST);
2318                 retVal = -1;
2319         } else {
2320                 struct yaffs_obj *newdir = NULL;
2321                 struct yaffs_obj *link = NULL;
2322
2323                 YCHAR *newname;
2324
2325                 newdir = yaffsfs_FindDirectory(NULL,newpath,&newname,0);
2326
2327                 if(!newdir){
2328                         yaffsfs_SetError(-ENOTDIR);
2329                         retVal = -1;
2330                 }else if(newdir->my_dev != obj->my_dev){
2331                         yaffsfs_SetError(-EXDEV);
2332                         retVal = -1;
2333                 }
2334
2335                 new_nameLength = yaffs_strnlen(newname,YAFFS_MAX_NAME_LENGTH+1);
2336
2337                 if(new_nameLength == 0){
2338                         yaffsfs_SetError(-ENOENT);
2339                         retVal = -1;
2340                 } else if (new_nameLength > YAFFS_MAX_NAME_LENGTH){
2341                         yaffsfs_SetError(-ENAMETOOLONG);
2342                         retVal = -1;
2343                 }
2344
2345                 if(retVal == 0) {
2346                         link = yaffs_link_obj(newdir,newname,obj);
2347                         if(link)
2348                                 retVal = 0;
2349                         else{
2350                                 yaffsfs_SetError(-ENOSPC);
2351                                 retVal = -1;
2352                         }
2353
2354                 }
2355         }
2356         yaffsfs_Unlock();
2357
2358         return retVal;
2359 }
2360
2361 int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev)
2362 {
2363         return -1;
2364 }
2365
2366
2367
2368 /*
2369  * yaffs_n_handles()
2370  * Returns number of handles attached to the object
2371  */
2372 int yaffs_n_handles(const YCHAR *path)
2373 {
2374         struct yaffs_obj *obj;
2375
2376         obj = yaffsfs_FindObject(NULL,path,0,1);
2377
2378         return yaffsfs_CountHandles(obj);
2379 }
2380
2381 int yaffs_get_error(void)
2382 {
2383         return yaffsfs_GetLastError();
2384 }
2385
2386 int yaffs_dump_dev(const YCHAR *path)
2387 {
2388 #if 0
2389         YCHAR *rest;
2390
2391         struct yaffs_obj *obj = yaffsfs_FindRoot(path,&rest);
2392
2393         if(obj){
2394                 struct yaffs_dev *dev = obj->my_dev;
2395
2396                 printf("\n"
2397                            "n_page_writes.......... %d\n"
2398                            "n_page_reads........... %d\n"
2399                            "n_erasures....... %d\n"
2400                            "n_gc_copies............ %d\n"
2401                            "garbageCollections... %d\n"
2402                            "passiveGarbageColl'ns %d\n"
2403                            "\n",
2404                                 dev->n_page_writes,
2405                                 dev->n_page_reads,
2406                                 dev->n_erasures,
2407                                 dev->n_gc_copies,
2408                                 dev->garbageCollections,
2409                                 dev->passiveGarbageCollections
2410                 );
2411
2412         }
2413
2414 #endif
2415         return 0;
2416 }
2417