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
  34 const char *yaffsfs_c_version="$Id: yaffsfs.c,v 1.35 2010-02-25 22:38:03 charles Exp $";
  35
  36 /* configurationList is the list of devices that are supported */
  37 static yaffsfs_DeviceConfiguration *yaffsfs_configurationList;
  38
  39
  40 /* Some forward references */
  41 static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const YCHAR *path, int symDepth);
  42 static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj);
  43
  44 unsigned int yaffs_wr_attempts;
  45
  46 /*
  47  * Handle management.
  48  * There are open inodes in yaffsfs_Inode.
  49  * There are open handles in yaffsfs_Handle.
  50  *
  51  * Things are structured this way to be like the Linux VFS model
  52  * so that interactions with the yaffs guts calls are similar.
  53  * That means more common code paths and less special code.
  54  * That means better testing etc.
  55  */
  56
  57 typedef struct {
  58         int count;      /* Number of handles accessing this inode */
  59         yaffs_Object *iObj;
  60 } yaffsfs_Inode;
  61
  62 typedef struct{
  63         __u8    readOnly:1;
  64         __u8    append:1;
  65         int     inodeId:13;     /* Index to corresponding yaffsfs_Inode */
  66         int     useCount:16;    /* Use count for this handle */
  67         __u32 position;         /* current position in file */
  68 }yaffsfs_Handle;
  69
  70 static yaffsfs_Inode yaffsfs_inode[YAFFSFS_N_HANDLES];
  71 static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
  72
  73 /*
  74  * yaffsfs_InitHandle
  75  * Inilitalise handle management on start-up.
  76  */
  77
  78 static int yaffsfs_InitHandles(void)
  79 {
  80         int i;
  81         memset(yaffsfs_inode,0,sizeof(yaffsfs_inode));
  82         memset(yaffsfs_handle,0,sizeof(yaffsfs_handle));
  83         for(i = 0; i < YAFFSFS_N_HANDLES; i++)
  84                 yaffsfs_handle[i].inodeId = -1;
  85
  86         return 0;
  87 }
  88
  89 yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
  90 {
  91         if(h < 0 || h >= YAFFSFS_N_HANDLES)
  92                 return NULL;
  93
  94         return &yaffsfs_handle[h];
  95 }
  96
  97 yaffsfs_Inode *yaffsfs_GetInodePointer(int handle)
  98 {
  99         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 100
 101         if(h && h->useCount > 0 && h->inodeId >= 0 && h->inodeId < YAFFSFS_N_HANDLES)
 102                 return  &yaffsfs_inode[h->inodeId];
 103
 104         return NULL;
 105 }
 106
 107 yaffs_Object *yaffsfs_GetHandleObject(int handle)
 108 {
 109         yaffsfs_Inode *in = yaffsfs_GetInodePointer(handle);
 110
 111         if(in)
 112                 return in->iObj;
 113
 114         return NULL;
 115 }
 116
 117 /*
 118  * yaffsfs_GetInodeIdForObject
 119  * Grab an inode entry when opening a new inode.
 120  */
 121
 122 static int yaffsfs_GetInodeIdForObject(yaffs_Object *obj)
 123 {
 124         int i;
 125         int ret = -1;
 126         yaffsfs_Inode *in = NULL;
 127
 128         if(obj)
 129                 obj = yaffs_GetEquivalentObject(obj);
 130
 131         /* Look for it. If we can't find it then make one */
 132         for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
 133                 if(yaffsfs_inode[i].iObj == obj)
 134                         ret = i;
 135         }
 136
 137         for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
 138                 if(!yaffsfs_inode[i].iObj)
 139                         ret = i;
 140         }
 141
 142
 143         if(ret>=0){
 144                 in = &yaffsfs_inode[ret];
 145                 if(!in->iObj)
 146                         in->count = 0;
 147                 in->iObj = obj;
 148                 in->count++;
 149         }
 150
 151
 152         return ret;
 153 }
 154
 155 static void yaffsfs_ReleaseInode(yaffsfs_Inode *in)
 156 {
 157         yaffs_Object *obj;
 158
 159         obj = in->iObj;
 160
 161         if(obj->unlinked)
 162                 yaffs_DeleteObject(obj);
 163
 164         obj->myInode = NULL;
 165         in->iObj = NULL;
 166
 167 }
 168
 169 static void yaffsfs_PutInode(int inodeId)
 170 {
 171         if(inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES){
 172                 yaffsfs_Inode *in = & yaffsfs_inode[inodeId];
 173                 in->count--;
 174                 if(in->count <= 0)
 175                         yaffsfs_ReleaseInode(in);
 176         }
 177 }
 178
 179
 180 /*
 181  * yaffsfs_GetHandle
 182  * Grab a handle (when opening a file)
 183  */
 184
 185 static int yaffsfs_GetNewHandle(void)
 186 {
 187         int i;
 188         yaffsfs_Handle *h;
 189
 190         for(i = 0; i < YAFFSFS_N_HANDLES; i++){
 191                 h = yaffsfs_GetHandlePointer(i);
 192                 if(!h){
 193                         /* todo bug: should never happen */
 194                 }
 195                 if(h->useCount < 1){
 196                         memset(h,0,sizeof(yaffsfs_Handle));
 197                         h->inodeId=-1;
 198                         h->useCount=1;
 199                         return i;
 200                 }
 201         }
 202         return -1;
 203 }
 204
 205 /*
 206  * yaffs_GetHandle
 207  * Increase use of handle when reading/writing a file
 208  */
 209 static int yaffsfs_GetHandle(int handle)
 210 {
 211         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 212
 213         if(h && h->useCount > 0){
 214                 h->useCount++;
 215         }
 216         return 0;
 217 }
 218
 219 /*
 220  * yaffs_PutHandle
 221  * Let go of a handle when closing a file or aborting an open or
 222  * ending a read or write.
 223  */
 224 static int yaffsfs_PutHandle(int handle)
 225 {
 226         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 227
 228         if(h && h->useCount > 0){
 229                 h->useCount--;
 230                 if(h->useCount < 1){
 231                         if(h->inodeId >= 0){
 232                                 yaffsfs_PutInode(h->inodeId);
 233                                 h->inodeId = -1;
 234                         }
 235                 }
 236         }
 237         return 0;
 238 }
 239
 240
 241
 242
 243 /*
 244  *  Stuff to search for a directory from a path
 245  */
 246
 247
 248 int yaffsfs_Match(YCHAR a, YCHAR b)
 249 {
 250         /* case sensitive */
 251         return (a == b);
 252 }
 253
 254 int yaffsfs_IsPathDivider(YCHAR ch)
 255 {
 256         YCHAR *str = YAFFS_PATH_DIVIDERS;
 257
 258         while(*str){
 259                 if(*str == ch)
 260                         return 1;
 261                 str++;
 262         }
 263
 264         return 0;
 265 }
 266
 267 /*
 268  * yaffsfs_FindDevice
 269  * yaffsfs_FindRoot
 270  * Scan the configuration list to find the root.
 271  * Curveballs: Should match paths that end in '/' too
 272  * Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
 273  */
 274 static yaffs_Device *yaffsfs_FindDevice(const YCHAR *path, YCHAR **restOfPath)
 275 {
 276         yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList;
 277         const YCHAR *leftOver;
 278         const YCHAR *p;
 279         yaffs_Device *retval = NULL;
 280         int thisMatchLength;
 281         int longestMatch = -1;
 282         int matching;
 283
 284         /*
 285          * Check all configs, choose the one that:
 286          * 1) Actually matches a prefix (ie /a amd /abc will not match
 287          * 2) Matches the longest.
 288          */
 289         while(cfg && cfg->prefix && cfg->dev){
 290                 leftOver = path;
 291                 p = cfg->prefix;
 292                 thisMatchLength = 0;
 293                 matching = 1;
 294
 295
 296                 while(matching && *p && *leftOver){
 297                         /* Skip over any /s */
 298                         while(yaffsfs_IsPathDivider(*p))
 299                               p++;
 300
 301                         /* Skip over any /s */
 302                         while(yaffsfs_IsPathDivider(*leftOver))
 303                               leftOver++;
 304
 305                         /* Now match the text part */
 306                         while(matching &&
 307                               *p && !yaffsfs_IsPathDivider(*p) &&
 308                               *leftOver && !yaffsfs_IsPathDivider(*leftOver)){
 309                                 if(yaffsfs_Match(*p,*leftOver)){
 310                                         p++;
 311                                         leftOver++;
 312                                         thisMatchLength++;
 313                                 } else {
 314                                         matching = 0;
 315                                 }
 316                         }
 317                 }
 318
 319                 /* Skip over any /s in leftOver */
 320                 while(yaffsfs_IsPathDivider(*leftOver))
 321                       leftOver++;
 322
 323
 324                 if( matching && (thisMatchLength > longestMatch)){
 325                         /* Matched prefix */
 326                         *restOfPath = (YCHAR *)leftOver;
 327                         retval = cfg->dev;
 328                         longestMatch = thisMatchLength;
 329                 }
 330
 331                 cfg++;
 332         }
 333         return retval;
 334 }
 335
 336 #if 0
 337 static yaffs_Device *yaffsfs_FindDevice(const YCHAR *path, YCHAR **restOfPath)
 338 {
 339         yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList;
 340         const YCHAR *leftOver;
 341         const YCHAR *p;
 342         yaffs_Device *retval = NULL;
 343         int thisMatchLength;
 344         int longestMatch = -1;
 345
 346         /*
 347          * Check all configs, choose the one that:
 348          * 1) Actually matches a prefix (ie /a amd /abc will not match
 349          * 2) Matches the longest.
 350          */
 351         while(cfg && cfg->prefix && cfg->dev){
 352                 leftOver = path;
 353                 p = cfg->prefix;
 354                 thisMatchLength = 0;
 355
 356                 while(*p &&  /* unmatched part of prefix */
 357                       !(yaffsfs_IsPathDivider(*p) && (p[1] == 0)) &&
 358                       *leftOver && yaffsfs_Match(*p,*leftOver)){
 359                         p++;
 360                         leftOver++;
 361                         thisMatchLength++;
 362                 }
 363
 364
 365                 if((!*p || (yaffsfs_IsPathDivider(*p) && (p[1] == 0))) &&  /* end of prefix */
 366                    (!*leftOver || yaffsfs_IsPathDivider(*leftOver)) && /* no more in this path name part */
 367                    (thisMatchLength > longestMatch)){
 368                         /* Matched prefix */
 369                         *restOfPath = (YCHAR *)leftOver;
 370                         retval = cfg->dev;
 371                         longestMatch = thisMatchLength;
 372                 }
 373                 cfg++;
 374         }
 375         return retval;
 376 }
 377 #endif
 378
 379 static yaffs_Object *yaffsfs_FindRoot(const YCHAR *path, YCHAR **restOfPath)
 380 {
 381
 382         yaffs_Device *dev;
 383
 384         dev= yaffsfs_FindDevice(path,restOfPath);
 385         if(dev && dev->isMounted){
 386                 return dev->rootDir;
 387         }
 388         return NULL;
 389 }
 390
 391 static yaffs_Object *yaffsfs_FollowLink(yaffs_Object *obj,int symDepth)
 392 {
 393
 394         while(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
 395                 YCHAR *alias = obj->variant.symLinkVariant.alias;
 396
 397                 if(yaffsfs_IsPathDivider(*alias))
 398                         /* Starts with a /, need to scan from root up */
 399                         obj = yaffsfs_FindObject(NULL,alias,symDepth++);
 400                 else
 401                         /* Relative to here, so use the parent of the symlink as a start */
 402                         obj = yaffsfs_FindObject(obj->parent,alias,symDepth++);
 403         }
 404         return obj;
 405 }
 406
 407
 408 /*
 409  * yaffsfs_FindDirectory
 410  * Parse a path to determine the directory and the name within the directory.
 411  *
 412  * eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
 413  */
 414 static yaffs_Object *yaffsfs_DoFindDirectory(yaffs_Object *startDir,
 415                                 const YCHAR *path, YCHAR **name, int symDepth)
 416 {
 417         yaffs_Object *dir;
 418         YCHAR *restOfPath;
 419         YCHAR str[YAFFS_MAX_NAME_LENGTH+1];
 420         int i;
 421
 422         if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES)
 423                 return NULL;
 424
 425         if(startDir){
 426                 dir = startDir;
 427                 restOfPath = (YCHAR *)path;
 428         }
 429         else
 430                 dir = yaffsfs_FindRoot(path,&restOfPath);
 431
 432         while(dir){
 433                 /*
 434                  * parse off /.
 435                  * curve ball: also throw away surplus '/'
 436                  * eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
 437                  */
 438                 while(yaffsfs_IsPathDivider(*restOfPath))
 439                         restOfPath++; /* get rid of '/' */
 440
 441                 *name = restOfPath;
 442                 i = 0;
 443
 444                 while(*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)){
 445                         if (i < YAFFS_MAX_NAME_LENGTH){
 446                                 str[i] = *restOfPath;
 447                                 str[i+1] = '\0';
 448                                 i++;
 449                         }
 450                         restOfPath++;
 451                 }
 452
 453                 if(!*restOfPath)
 454                         /* got to the end of the string */
 455                         return dir;
 456                 else{
 457                         if(yaffs_strcmp(str,_Y(".")) == 0)
 458                         {
 459                                 /* Do nothing */
 460                         }
 461                         else if(yaffs_strcmp(str,_Y("..")) == 0)
 462                                 dir = dir->parent;
 463                         else{
 464                                 dir = yaffs_FindObjectByName(dir,str);
 465
 466                                 while(dir && dir->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
 467                                         dir = yaffsfs_FollowLink(dir,symDepth);
 468
 469
 470                                 if(dir && dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 471                                         dir = NULL;
 472                         }
 473                 }
 474         }
 475         /* directory did not exist. */
 476         return NULL;
 477 }
 478
 479 static yaffs_Object *yaffsfs_FindDirectory(yaffs_Object *relativeDirectory,
 480                                         const YCHAR *path,YCHAR **name,int symDepth)
 481 {
 482         return yaffsfs_DoFindDirectory(relativeDirectory,path,name,symDepth);
 483 }
 484
 485 /*
 486  * yaffsfs_FindObject turns a path for an existing object into the object
 487  */
 488 static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const YCHAR *path,int symDepth)
 489 {
 490         yaffs_Object *dir;
 491         YCHAR *name;
 492
 493         dir = yaffsfs_FindDirectory(relativeDirectory,path,&name,symDepth);
 494
 495         if(dir && *name)
 496                 return yaffs_FindObjectByName(dir,name);
 497
 498         return dir;
 499 }
 500
 501
 502 int yaffs_dup(int fd)
 503 {
 504         int newHandle = -1;
 505         yaffsfs_Handle *oldPtr = NULL;
 506         yaffsfs_Handle *newPtr = NULL;
 507
 508         yaffsfs_Lock();
 509
 510         oldPtr = yaffsfs_GetHandlePointer(fd);
 511         if(oldPtr && oldPtr->useCount > 0)
 512                 newHandle = yaffsfs_GetNewHandle();
 513         if(newHandle >= 0)
 514                 newPtr = yaffsfs_GetHandlePointer(newHandle);
 515
 516         if(newPtr){
 517                 *newPtr = *oldPtr;
 518                 return newHandle;
 519         }
 520
 521         if(!oldPtr)
 522                 yaffsfs_SetError(-EBADF);
 523         else
 524                 yaffsfs_SetError(-ENOMEM);
 525
 526         return -1;
 527
 528 }
 529
 530 int yaffs_open(const YCHAR *path, int oflag, int mode)
 531 {
 532         yaffs_Object *obj = NULL;
 533         yaffs_Object *dir = NULL;
 534         YCHAR *name;
 535         int handle = -1;
 536         yaffsfs_Handle *h = NULL;
 537         int openDenied = 0;
 538         int symDepth = 0;
 539         int errorReported = 0;
 540
 541         /* O_EXCL only has meaning if O_CREAT is specified */
 542         if(!(oflag & O_CREAT))
 543                 oflag &= ~(O_EXCL);
 544
 545         /* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
 546         if( (oflag & O_CREAT) & (oflag & O_EXCL))
 547                 oflag &= ~(O_TRUNC);
 548
 549         /* Todo: Are there any more flag combos to sanitise ? */
 550
 551
 552         yaffsfs_Lock();
 553
 554         handle = yaffsfs_GetNewHandle();
 555
 556         if(handle >= 0){
 557
 558                 h = yaffsfs_GetHandlePointer(handle);
 559
 560
 561                 /* try to find the exisiting object */
 562                 obj = yaffsfs_FindObject(NULL,path,0);
 563
 564                 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
 565                         obj = yaffsfs_FollowLink(obj,symDepth++);
 566
 567                 if(obj)
 568                         obj = yaffs_GetEquivalentObject(obj);
 569
 570                 if(obj && obj->variantType != YAFFS_OBJECT_TYPE_FILE)
 571                         obj = NULL;
 572
 573                 if(obj){
 574
 575                         /* The file already exists */
 576
 577                         /* Open should fail if O_CREAT and O_EXCL are specified since
 578                          * the file exists
 579                          */
 580                         if((oflag & O_EXCL) && (oflag & O_CREAT)){
 581                                 openDenied = 1;
 582                                 yaffsfs_SetError(-EEXIST);
 583                                 errorReported = 1;
 584                         }
 585
 586                         /* Check file permissions */
 587                         if( (oflag & (O_RDWR | O_WRONLY)) == 0 &&     /* ie O_RDONLY */
 588                            !(obj->yst_mode & S_IREAD))
 589                                 openDenied = 1;
 590
 591                         if( (oflag & O_RDWR) &&
 592                            !(obj->yst_mode & S_IREAD))
 593                                 openDenied = 1;
 594
 595                         if( (oflag & (O_RDWR | O_WRONLY)) &&
 596                            !(obj->yst_mode & S_IWRITE))
 597                                 openDenied = 1;
 598
 599                 } else if((oflag & O_CREAT)) {
 600                         /* Let's see if we can create this file */
 601                         dir = yaffsfs_FindDirectory(NULL,path,&name,0);
 602                         if(dir  && dir->myDev->readOnly){
 603                                 yaffsfs_SetError(-EINVAL);
 604                                 errorReported = 1;
 605                         } else if(dir)
 606                                 obj = yaffs_MknodFile(dir,name,mode,0,0);
 607                         else {
 608                                 yaffsfs_SetError(-ENOTDIR);
 609                                 errorReported = 1;
 610                         }
 611                 }
 612
 613                 if(obj && !openDenied) {
 614                         int inodeId = yaffsfs_GetInodeIdForObject(obj);
 615
 616                         if(inodeId<0) {
 617                                 /*
 618                                  * Todo: Fix any problem if inodes run out, though that
 619                                  * can't happen if the number of inode items >= number of handles.
 620                                  */
 621                         }
 622
 623                         h->inodeId = inodeId;
 624                         h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1;
 625                         h->append =  (oflag & O_APPEND) ? 1 : 0;
 626                         h->position = 0;
 627
 628                         /* Hook inode to object */
 629                         obj->myInode = (void*) &yaffsfs_inode[inodeId];
 630
 631                         if((oflag & O_TRUNC) && !h->readOnly)
 632                                 yaffs_ResizeFile(obj,0);
 633                 } else {
 634                         yaffsfs_PutHandle(handle);
 635                         if(!errorReported) {
 636                                 yaffsfs_SetError(-EACCES);
 637                                 errorReported = 1;
 638                         }
 639                         handle = -1;
 640                 }
 641         }
 642
 643         yaffsfs_Unlock();
 644
 645         return handle;
 646 }
 647
 648 int yaffs_Dofsync(int fd,int datasync)
 649 {
 650         yaffsfs_Handle *h = NULL;
 651         int retVal = 0;
 652
 653         yaffsfs_Lock();
 654
 655         h = yaffsfs_GetHandlePointer(fd);
 656
 657         if(h && h->useCount > 0)
 658                 /* flush the file */
 659                 yaffs_FlushFile(yaffsfs_inode[h->inodeId].iObj,1,datasync);
 660         else {
 661                 /* bad handle */
 662                 yaffsfs_SetError(-EBADF);
 663                 retVal = -1;
 664         }
 665
 666         yaffsfs_Unlock();
 667
 668         return retVal;
 669 }
 670
 671 int yaffs_fsync(int fd)
 672 {
 673         return yaffs_Dofsync(fd,0);
 674 }
 675
 676 int yaffs_flush(int fd)
 677 {
 678         return yaffs_fsync(fd);
 679 }
 680
 681 int yaffs_fdatasync(int fd)
 682 {
 683         return yaffs_Dofsync(fd,1);
 684 }
 685
 686 int yaffs_close(int fd)
 687 {
 688         yaffsfs_Handle *h = NULL;
 689         int retVal = 0;
 690
 691         yaffsfs_Lock();
 692
 693         h = yaffsfs_GetHandlePointer(fd);
 694
 695         if(h && h->useCount > 0) {
 696                 /* clean up */
 697                 yaffs_FlushFile(yaffsfs_inode[h->inodeId].iObj,1,0);
 698                 yaffsfs_PutHandle(fd);
 699                 retVal = 0;
 700         } else {
 701                 /* bad handle */
 702                 yaffsfs_SetError(-EBADF);
 703                 retVal = -1;
 704         }
 705
 706         yaffsfs_Unlock();
 707
 708         return retVal;
 709 }
 710
 711
 712
 713 int yaffsfs_do_read(int fd, void *vbuf, unsigned int nbyte, int isPread, int offset)
 714 {
 715         yaffsfs_Handle *h = NULL;
 716         yaffs_Object *obj = NULL;
 717         int pos = 0;
 718         int startPos = 0;
 719         int nRead = 0;
 720         int nToRead = 0;
 721         int totalRead = 0;
 722         unsigned int maxRead;
 723         __u8 *buf = (__u8 *)vbuf;
 724
 725         yaffsfs_Lock();
 726         h = yaffsfs_GetHandlePointer(fd);
 727         obj = yaffsfs_GetHandleObject(fd);
 728
 729         if(!h || !obj){
 730                 /* bad handle */
 731                 yaffsfs_SetError(-EBADF);
 732                 totalRead = -1;
 733         } else if( h && obj){
 734                 if(isPread)
 735                         startPos = offset;
 736                 else
 737                         startPos = h->position;
 738
 739                 pos = startPos;
 740
 741                 if(yaffs_GetObjectFileLength(obj) > pos)
 742                         maxRead = yaffs_GetObjectFileLength(obj) - pos;
 743                 else
 744                         maxRead = 0;
 745
 746                 if(nbyte > maxRead)
 747                         nbyte = maxRead;
 748
 749
 750                 yaffsfs_GetHandle(fd);
 751
 752                 while(nbyte > 0) {
 753                         nToRead = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
 754                         if(nToRead > nbyte)
 755                                 nToRead = nbyte;
 756                         nRead = yaffs_ReadDataFromFile(obj,buf,pos,nToRead);
 757
 758                         if(nRead > 0){
 759                                 totalRead += nRead;
 760                                 pos += nRead;
 761                                 buf += nRead;
 762                         }
 763
 764                         if(nRead == nToRead)
 765                                 nbyte-=nRead;
 766                         else
 767                                 nbyte = 0; /* no more to read */
 768
 769
 770                         if(nbyte > 0){
 771                                 yaffsfs_Unlock();
 772                                 yaffsfs_Lock();
 773                         }
 774
 775                 }
 776
 777                 yaffsfs_PutHandle(fd);
 778
 779                 if(!isPread) {
 780                         if(totalRead >= 0)
 781                                 h->position = startPos + totalRead;
 782                         else {
 783                                         /* todo error */
 784                         }
 785                 }
 786
 787         }
 788
 789         yaffsfs_Unlock();
 790
 791         return (totalRead >= 0) ? totalRead : -1;
 792
 793 }
 794
 795 int yaffs_read(int fd, void *buf, unsigned int nbyte)
 796 {
 797         return yaffsfs_do_read(fd, buf, nbyte, 0, 0);
 798 }
 799
 800 int yaffs_pread(int fd, void *buf, unsigned int nbyte, unsigned int offset)
 801 {
 802         return yaffsfs_do_read(fd, buf, nbyte, 1, offset);
 803 }
 804
 805 int yaffsfs_do_write(int fd, const void *vbuf, unsigned int nbyte, int isPwrite, int offset)
 806 {
 807         yaffsfs_Handle *h = NULL;
 808         yaffs_Object *obj = NULL;
 809         int pos = 0;
 810         int startPos = 0;
 811         int nWritten = 0;
 812         int totalWritten = 0;
 813         int writeThrough = 0;
 814         int nToWrite = 0;
 815         const __u8 *buf = (const __u8 *)vbuf;
 816
 817         yaffsfs_Lock();
 818         h = yaffsfs_GetHandlePointer(fd);
 819         obj = yaffsfs_GetHandleObject(fd);
 820
 821         if(!h || !obj){
 822                 /* bad handle */
 823                 yaffsfs_SetError(-EBADF);
 824                 totalWritten = -1;
 825         } else if( h && obj && (h->readOnly || obj->myDev->readOnly)){
 826                 yaffsfs_SetError(-EINVAL);
 827                 totalWritten=-1;
 828         } else if( h && obj){
 829                 if(isPwrite)
 830                         startPos = offset;
 831                 if(h->append)
 832                         startPos = yaffs_GetObjectFileLength(obj);
 833                 else
 834                         startPos = h->position;
 835
 836                 yaffsfs_GetHandle(fd);
 837                 pos = startPos;
 838                 while(nbyte > 0) {
 839                         nToWrite = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
 840                         if(nToWrite > nbyte)
 841                                 nToWrite = nbyte;
 842
 843                         nWritten = yaffs_WriteDataToFile(obj,buf,pos,nToWrite,writeThrough);
 844                         if(nWritten > 0){
 845                                 totalWritten += nWritten;
 846                                 pos += nWritten;
 847                                 buf += nWritten;
 848                         }
 849
 850                         if(nWritten == nToWrite)
 851                                 nbyte -= nToWrite;
 852                         else
 853                                 nbyte = 0;
 854
 855                         if(nWritten < 1 && totalWritten < 1){
 856                                 yaffsfs_SetError(-ENOSPC);
 857                                 totalWritten = -1;
 858                         }
 859
 860                         if(nbyte > 0){
 861                                 yaffsfs_Unlock();
 862                                 yaffsfs_Lock();
 863                         }
 864                 }
 865
 866                 yaffsfs_PutHandle(fd);
 867
 868                 if(!isPwrite){
 869                         if(totalWritten > 0)
 870                                 h->position = startPos + totalWritten;
 871                         else {
 872                                 /* todo error */
 873                         }
 874                 }
 875         }
 876
 877         yaffsfs_Unlock();
 878
 879         return (totalWritten >= 0) ? totalWritten : -1;
 880 }
 881
 882 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
 883 {
 884         return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
 885 }
 886
 887 int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, unsigned int offset)
 888 {
 889         return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
 890 }
 891
 892
 893 int yaffs_truncate(const YCHAR *path,off_t newSize)
 894 {
 895         yaffs_Object *obj = NULL;
 896         int result = YAFFS_FAIL;
 897
 898         yaffsfs_Lock();
 899
 900         obj = yaffsfs_FindObject(NULL,path,0);
 901         if(obj)
 902                 obj = yaffs_GetEquivalentObject(obj);
 903
 904         if(!obj)
 905                 yaffsfs_SetError(-ENOENT);
 906         else if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
 907                 yaffsfs_SetError(-EISDIR);
 908         else if(obj->myDev->readOnly)
 909                 yaffsfs_SetError(-EINVAL);
 910         else
 911                 result = yaffs_ResizeFile(obj,newSize);
 912
 913         yaffsfs_Unlock();
 914
 915
 916         return (result) ? 0 : -1;
 917 }
 918
 919 int yaffs_ftruncate(int fd, off_t newSize)
 920 {
 921         yaffsfs_Handle *h = NULL;
 922         yaffs_Object *obj = NULL;
 923         int result = 0;
 924
 925         yaffsfs_Lock();
 926         h = yaffsfs_GetHandlePointer(fd);
 927         obj = yaffsfs_GetHandleObject(fd);
 928
 929         if(!h || !obj)
 930                 /* bad handle */
 931                 yaffsfs_SetError(-EBADF);
 932         else if(obj->myDev->readOnly)
 933                 yaffsfs_SetError(-EINVAL);
 934         else
 935                 /* resize the file */
 936                 result = yaffs_ResizeFile(obj,newSize);
 937         yaffsfs_Unlock();
 938
 939
 940         return (result) ? 0 : -1;
 941
 942 }
 943
 944 off_t yaffs_lseek(int fd, off_t offset, int whence)
 945 {
 946         yaffsfs_Handle *h = NULL;
 947         yaffs_Object *obj = NULL;
 948         int pos = -1;
 949         int fSize = -1;
 950
 951         yaffsfs_Lock();
 952         h = yaffsfs_GetHandlePointer(fd);
 953         obj = yaffsfs_GetHandleObject(fd);
 954
 955         if(!h || !obj)
 956                 /* bad handle */
 957                 yaffsfs_SetError(-EBADF);
 958         else if(whence == SEEK_SET){
 959                 if(offset >= 0)
 960                         pos = offset;
 961         }
 962         else if(whence == SEEK_CUR) {
 963                 if( (h->position + offset) >= 0)
 964                         pos = (h->position + offset);
 965         }
 966         else if(whence == SEEK_END) {
 967                 fSize = yaffs_GetObjectFileLength(obj);
 968                 if(fSize >= 0 && (fSize + offset) >= 0)
 969                         pos = fSize + offset;
 970         }
 971
 972         if(pos >= 0)
 973                 h->position = pos;
 974         else {
 975                 /* todo error */
 976         }
 977
 978
 979         yaffsfs_Unlock();
 980
 981         return pos;
 982 }
 983
 984
 985 int yaffsfs_DoUnlink(const YCHAR *path,int isDirectory)
 986 {
 987         yaffs_Object *dir = NULL;
 988         yaffs_Object *obj = NULL;
 989         YCHAR *name;
 990         int result = YAFFS_FAIL;
 991
 992         yaffsfs_Lock();
 993
 994         obj = yaffsfs_FindObject(NULL,path,0);
 995         dir = yaffsfs_FindDirectory(NULL,path,&name,0);
 996         if(!dir)
 997                 yaffsfs_SetError(-ENOTDIR);
 998         else if(!obj)
 999                 yaffsfs_SetError(-ENOENT);
1000         else if(obj->myDev->readOnly)
1001                 yaffsfs_SetError(-EINVAL);
1002         else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1003                 yaffsfs_SetError(-EISDIR);
1004         else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
1005                 yaffsfs_SetError(-ENOTDIR);
1006         else {
1007                 result = yaffs_Unlink(dir,name);
1008
1009                 if(result == YAFFS_FAIL && isDirectory)
1010                         yaffsfs_SetError(-ENOTEMPTY);
1011         }
1012
1013         yaffsfs_Unlock();
1014
1015         /* todo error */
1016
1017         return (result == YAFFS_FAIL) ? -1 : 0;
1018 }
1019
1020
1021 int yaffs_rmdir(const YCHAR *path)
1022 {
1023         return yaffsfs_DoUnlink(path,1);
1024 }
1025
1026 int yaffs_unlink(const YCHAR *path)
1027 {
1028         return yaffsfs_DoUnlink(path,0);
1029 }
1030
1031 int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
1032 {
1033         yaffs_Object *olddir = NULL;
1034         yaffs_Object *newdir = NULL;
1035         yaffs_Object *obj = NULL;
1036         YCHAR *oldname;
1037         YCHAR *newname;
1038         int result= YAFFS_FAIL;
1039         int renameAllowed = 1;
1040
1041         yaffsfs_Lock();
1042
1043         olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
1044         newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
1045         obj = yaffsfs_FindObject(NULL,oldPath,0);
1046
1047         if(!olddir || !newdir || !obj) {
1048                 /* bad file */
1049                 yaffsfs_SetError(-EBADF);
1050                 renameAllowed = 0;
1051         } else if(obj->myDev->readOnly){
1052                 yaffsfs_SetError(-EINVAL);
1053                 renameAllowed = 0;
1054         } else if(olddir->myDev != newdir->myDev) {
1055                 /* oops must be on same device */
1056                 /* todo error */
1057                 yaffsfs_SetError(-EXDEV);
1058                 renameAllowed = 0;
1059         } else if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
1060                 /*
1061                  * It is a directory, check that it is not being renamed to
1062                  * being its own decendent.
1063                  * Do this by tracing from the new directory back to the root, checking for obj
1064                  */
1065
1066                 yaffs_Object *xx = newdir;
1067
1068                 while( renameAllowed && xx){
1069                         if(xx == obj)
1070                                 renameAllowed = 0;
1071                         xx = xx->parent;
1072                 }
1073                 if(!renameAllowed)
1074                         yaffsfs_SetError(-EACCES);
1075         }
1076
1077         if(renameAllowed)
1078                 result = yaffs_RenameObject(olddir,oldname,newdir,newname);
1079
1080         yaffsfs_Unlock();
1081
1082         return (result == YAFFS_FAIL) ? -1 : 0;
1083 }
1084
1085
1086 static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
1087 {
1088         int retVal = -1;
1089
1090         if(obj)
1091                 obj = yaffs_GetEquivalentObject(obj);
1092
1093         if(obj && buf){
1094                 buf->st_dev = (int)obj->myDev->context;
1095                 buf->st_ino = obj->objectId;
1096                 buf->st_mode = obj->yst_mode & ~S_IFMT; /* clear out file type bits */
1097
1098                 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1099                         buf->st_mode |= S_IFDIR;
1100                 else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
1101                         buf->st_mode |= S_IFLNK;
1102                 else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
1103                         buf->st_mode |= S_IFREG;
1104
1105                 buf->st_nlink = yaffs_GetObjectLinkCount(obj);
1106                 buf->st_uid = 0;
1107                 buf->st_gid = 0;;
1108                 buf->st_rdev = obj->yst_rdev;
1109                 buf->st_size = yaffs_GetObjectFileLength(obj);
1110                 buf->st_blksize = obj->myDev->nDataBytesPerChunk;
1111                 buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
1112 #if CONFIG_YAFFS_WINCE
1113                 buf->yst_wince_atime[0] = obj->win_atime[0];
1114                 buf->yst_wince_atime[1] = obj->win_atime[1];
1115                 buf->yst_wince_ctime[0] = obj->win_ctime[0];
1116                 buf->yst_wince_ctime[1] = obj->win_ctime[1];
1117                 buf->yst_wince_mtime[0] = obj->win_mtime[0];
1118                 buf->yst_wince_mtime[1] = obj->win_mtime[1];
1119 #else
1120                 buf->yst_atime = obj->yst_atime;
1121                 buf->yst_ctime = obj->yst_ctime;
1122                 buf->yst_mtime = obj->yst_mtime;
1123 #endif
1124                 retVal = 0;
1125         }
1126         return retVal;
1127 }
1128
1129 static int yaffsfs_DoStatOrLStat(const YCHAR *path, struct yaffs_stat *buf,int doLStat)
1130 {
1131         yaffs_Object *obj;
1132
1133         int retVal = -1;
1134
1135         yaffsfs_Lock();
1136         obj = yaffsfs_FindObject(NULL,path,0);
1137
1138         if(!doLStat && obj)
1139                 obj = yaffsfs_FollowLink(obj,0);
1140
1141         if(obj)
1142                 retVal = yaffsfs_DoStat(obj,buf);
1143         else
1144                 /* todo error not found */
1145                 yaffsfs_SetError(-ENOENT);
1146
1147         yaffsfs_Unlock();
1148
1149         return retVal;
1150
1151 }
1152
1153 int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
1154 {
1155         return yaffsfs_DoStatOrLStat(path,buf,0);
1156 }
1157
1158 int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
1159 {
1160         return yaffsfs_DoStatOrLStat(path,buf,1);
1161 }
1162
1163 int yaffs_fstat(int fd, struct yaffs_stat *buf)
1164 {
1165         yaffs_Object *obj;
1166
1167         int retVal = -1;
1168
1169         yaffsfs_Lock();
1170         obj = yaffsfs_GetHandleObject(fd);
1171
1172         if(obj)
1173                 retVal = yaffsfs_DoStat(obj,buf);
1174         else
1175                 /* bad handle */
1176                 yaffsfs_SetError(-EBADF);
1177
1178         yaffsfs_Unlock();
1179
1180         return retVal;
1181 }
1182
1183 #ifdef CONFIG_YAFFS_WINCE
1184 int yaffs_get_wince_times(int fd, unsigned *wctime, unsigned *watime, unsigned *wmtime)
1185 {
1186         yaffs_Object *obj;
1187
1188         int retVal = -1;
1189
1190         yaffsfs_Lock();
1191         obj = yaffsfs_GetHandleObject(fd);
1192
1193         if(obj){
1194
1195                 if(wctime){
1196                         wctime[0] = obj->win_ctime[0];
1197                         wctime[1] = obj->win_ctime[1];
1198                 }
1199                 if(watime){
1200                         watime[0] = obj->win_atime[0];
1201                         watime[1] = obj->win_atime[1];
1202                 }
1203                 if(wmtime){
1204                         wmtime[0] = obj->win_mtime[0];
1205                         wmtime[1] = obj->win_mtime[1];
1206                 }
1207
1208
1209                 retVal = 0;
1210         } else
1211                 /*  bad handle */
1212                 yaffsfs_SetError(-EBADF);
1213
1214         yaffsfs_Unlock();
1215
1216         return retVal;
1217 }
1218
1219
1220 int yaffs_set_wince_times(int fd,
1221                                                   const unsigned *wctime,
1222                                                   const unsigned *watime,
1223                                                   const unsigned *wmtime)
1224 {
1225         yaffs_Object *obj;
1226         int result;
1227         int retVal = -1;
1228
1229         yaffsfs_Lock();
1230         obj = yaffsfs_GetHandleObject(fd);
1231
1232         if(obj){
1233
1234                 if(wctime){
1235                         obj->win_ctime[0] = wctime[0];
1236                         obj->win_ctime[1] = wctime[1];
1237                 }
1238                 if(watime){
1239                         obj->win_atime[0] = watime[0];
1240                         obj->win_atime[1] = watime[1];
1241                 }
1242                 if(wmtime){
1243                         obj->win_mtime[0] = wmtime[0];
1244                         obj->win_mtime[1] = wmtime[1];
1245                 }
1246
1247                 obj->dirty = 1;
1248                 result = yaffs_FlushFile(obj,0,0);
1249                 retVal = 0;
1250         } else
1251                 /* bad handle */
1252                 yaffsfs_SetError(-EBADF);
1253
1254         yaffsfs_Unlock();
1255
1256         return retVal;
1257 }
1258
1259 #endif
1260
1261
1262 static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
1263 {
1264         int result = -1;
1265
1266         if(obj)
1267                 obj = yaffs_GetEquivalentObject(obj);
1268
1269         if(obj) {
1270                 obj->yst_mode = mode;
1271                 obj->dirty = 1;
1272                 result = yaffs_FlushFile(obj,0,0);
1273         }
1274
1275         return result == YAFFS_OK ? 0 : -1;
1276 }
1277
1278
1279 int yaffs_access(const YCHAR *path, int amode)
1280 {
1281         yaffs_Object *obj;
1282
1283         int retval = 0;
1284
1285         yaffsfs_Lock();
1286         obj = yaffsfs_FindObject(NULL,path,0);
1287
1288         if(obj) {
1289                 int access_ok = 1;
1290
1291                 if((amode & R_OK) && !(obj->yst_mode & S_IREAD))
1292                         access_ok = 0;
1293                 if((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
1294                         access_ok = 0;
1295                 if((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
1296                         access_ok = 0;
1297
1298                 if(!access_ok) {
1299                         yaffsfs_SetError(-EACCES);
1300                         retval = -1;
1301                 }
1302         } else {
1303                 /* todo error not found */
1304                 yaffsfs_SetError(-ENOENT);
1305                 retval = -1;
1306         }
1307
1308         yaffsfs_Unlock();
1309
1310         return retval;
1311
1312 }
1313
1314
1315 int yaffs_chmod(const YCHAR *path, mode_t mode)
1316 {
1317         yaffs_Object *obj;
1318
1319         int retVal = -1;
1320
1321         yaffsfs_Lock();
1322         obj = yaffsfs_FindObject(NULL,path,0);
1323
1324         if(!obj)
1325                 yaffsfs_SetError(-ENOENT);
1326         else if(obj->myDev->readOnly)
1327                 yaffsfs_SetError(-EINVAL);
1328         else
1329                 retVal = yaffsfs_DoChMod(obj,mode);
1330
1331         yaffsfs_Unlock();
1332
1333         return retVal;
1334
1335 }
1336
1337
1338 int yaffs_fchmod(int fd, mode_t mode)
1339 {
1340         yaffs_Object *obj;
1341
1342         int retVal = -1;
1343
1344         yaffsfs_Lock();
1345         obj = yaffsfs_GetHandleObject(fd);
1346
1347         if(!obj)
1348                 yaffsfs_SetError(-ENOENT);
1349         else if(obj->myDev->readOnly)
1350                 yaffsfs_SetError(-EINVAL);
1351         else
1352                 retVal = yaffsfs_DoChMod(obj,mode);
1353
1354         yaffsfs_Unlock();
1355
1356         return retVal;
1357 }
1358
1359
1360 int yaffs_mkdir(const YCHAR *path, mode_t mode)
1361 {
1362         yaffs_Object *parent = NULL;
1363         yaffs_Object *dir = NULL;
1364         YCHAR *name;
1365         int retVal= -1;
1366
1367         yaffsfs_Lock();
1368         parent = yaffsfs_FindDirectory(NULL,path,&name,0);
1369         if(parent && parent->myDev->readOnly){
1370                 yaffsfs_SetError(-EINVAL);
1371         } else {
1372                 if(parent)
1373                         dir = yaffs_MknodDirectory(parent,name,mode,0,0);
1374                 if(dir)
1375                         retVal = 0;
1376                 else {
1377                         if(!parent)
1378                                 yaffsfs_SetError(-ENOENT); /* missing path */
1379                         else if (yaffs_FindObjectByName(parent,name))
1380                                 yaffsfs_SetError(-EEXIST); /* the name already exists */
1381                         else
1382                                 yaffsfs_SetError(-ENOSPC); /* just assume no space */
1383                         retVal = -1;
1384                 }
1385         }
1386
1387         yaffsfs_Unlock();
1388
1389         return retVal;
1390 }
1391
1392 int yaffs_mount2(const YCHAR *path,int readOnly)
1393 {
1394         int retVal=-1;
1395         int result=YAFFS_FAIL;
1396         yaffs_Device *dev=NULL;
1397         YCHAR *dummy;
1398
1399         T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Mounting %s" TENDSTR),path));
1400
1401         yaffsfs_Lock();
1402         dev = yaffsfs_FindDevice(path,&dummy);
1403         if(dev){
1404                 if(!dev->isMounted){
1405                         dev->readOnly = readOnly ? 1 : 0;
1406                         result = yaffs_GutsInitialise(dev);
1407                         if(result == YAFFS_FAIL)
1408                                 /* todo error - mount failed */
1409                                 yaffsfs_SetError(-ENOMEM);
1410                         retVal = result ? 0 : -1;
1411
1412                 }
1413                 else
1414                         /* todo error - already mounted. */
1415                         yaffsfs_SetError(-EBUSY);
1416         } else
1417                 /* todo error - no device */
1418                 yaffsfs_SetError(-ENODEV);
1419
1420         yaffsfs_Unlock();
1421         return retVal;
1422
1423 }
1424
1425 int yaffs_mount(const YCHAR *path)
1426 {
1427         return yaffs_mount2(path,0);
1428 }
1429
1430 int yaffs_sync(const YCHAR *path)
1431 {
1432         int retVal=-1;
1433         yaffs_Device *dev=NULL;
1434         YCHAR *dummy;
1435
1436         yaffsfs_Lock();
1437         dev = yaffsfs_FindDevice(path,&dummy);
1438         if(dev){
1439                 if(dev->isMounted){
1440
1441                         yaffs_FlushEntireDeviceCache(dev);
1442                         yaffs_CheckpointSave(dev);
1443
1444
1445                 } else
1446                         /* todo error - not mounted. */
1447                         yaffsfs_SetError(-EINVAL);
1448
1449         }else
1450                 /* todo error - no device */
1451                 yaffsfs_SetError(-ENODEV);
1452
1453         yaffsfs_Unlock();
1454         return retVal;
1455 }
1456
1457
1458 int yaffs_remount(const YCHAR *path, int force, int readOnly)
1459 {
1460         int retVal=-1;
1461         yaffs_Device *dev=NULL;
1462         YCHAR *dummy;
1463
1464         yaffsfs_Lock();
1465         dev = yaffsfs_FindDevice(path,&dummy);
1466         if(dev){
1467                 if(dev->isMounted){
1468                         int i;
1469                         int inUse;
1470
1471                         yaffs_FlushEntireDeviceCache(dev);
1472
1473                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse && !force; i++){
1474                                 if(yaffsfs_handle[i].useCount>0 && yaffsfs_inode[yaffsfs_handle[i].inodeId].iObj->myDev == dev)
1475                                         inUse = 1; /* the device is in use, can't unmount */
1476                         }
1477
1478                         if(!inUse || force){
1479                                 if(readOnly)
1480                                         yaffs_CheckpointSave(dev);
1481                                 dev->readOnly =  readOnly ? 1 : 0;
1482                                 retVal = 0;
1483                         } else
1484                                 yaffsfs_SetError(-EBUSY);
1485
1486                 } else
1487                         yaffsfs_SetError(-EINVAL);
1488
1489         }
1490         else
1491                 yaffsfs_SetError(-ENODEV);
1492
1493         yaffsfs_Unlock();
1494         return retVal;
1495
1496 }
1497
1498 int yaffs_unmount2(const YCHAR *path, int force)
1499 {
1500         int retVal=-1;
1501         yaffs_Device *dev=NULL;
1502         YCHAR *dummy;
1503
1504         yaffsfs_Lock();
1505         dev = yaffsfs_FindDevice(path,&dummy);
1506         if(dev){
1507                 if(dev->isMounted){
1508                         int i;
1509                         int inUse;
1510
1511                         yaffs_FlushEntireDeviceCache(dev);
1512                         yaffs_CheckpointSave(dev);
1513
1514                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++){
1515                                 if(yaffsfs_handle[i].useCount > 0 && yaffsfs_inode[yaffsfs_handle[i].inodeId].iObj->myDev == dev)
1516                                         inUse = 1; /* the device is in use, can't unmount */
1517                         }
1518
1519                         if(!inUse || force){
1520                                 yaffs_Deinitialise(dev);
1521
1522                                 retVal = 0;
1523                         } else
1524                                 /* todo error can't unmount as files are open */
1525                                 yaffsfs_SetError(-EBUSY);
1526
1527                 } else
1528                         /* todo error - not mounted. */
1529                         yaffsfs_SetError(-EINVAL);
1530
1531         }
1532         else
1533                 /* todo error - no device */
1534                 yaffsfs_SetError(-ENODEV);
1535
1536         yaffsfs_Unlock();
1537         return retVal;
1538
1539 }
1540
1541 int yaffs_unmount(const YCHAR *path)
1542 {
1543         return yaffs_unmount2(path,0);
1544 }
1545
1546 loff_t yaffs_freespace(const YCHAR *path)
1547 {
1548         loff_t retVal=-1;
1549         yaffs_Device *dev=NULL;
1550         YCHAR *dummy;
1551
1552         yaffsfs_Lock();
1553         dev = yaffsfs_FindDevice(path,&dummy);
1554         if(dev  && dev->isMounted){
1555                 retVal = yaffs_GetNumberOfFreeChunks(dev);
1556                 retVal *= dev->nDataBytesPerChunk;
1557
1558         } else
1559                 yaffsfs_SetError(-EINVAL);
1560
1561         yaffsfs_Unlock();
1562         return retVal;
1563 }
1564
1565 loff_t yaffs_totalspace(const YCHAR *path)
1566 {
1567         loff_t retVal=-1;
1568         yaffs_Device *dev=NULL;
1569         YCHAR *dummy;
1570
1571         yaffsfs_Lock();
1572         dev = yaffsfs_FindDevice(path,&dummy);
1573         if(dev  && dev->isMounted){
1574                 retVal = (dev->param.endBlock - dev->param.startBlock + 1) - dev->param.nReservedBlocks;
1575                 retVal *= dev->param.nChunksPerBlock;
1576                 retVal *= dev->nDataBytesPerChunk;
1577
1578         } else
1579                 yaffsfs_SetError(-EINVAL);
1580
1581         yaffsfs_Unlock();
1582         return retVal;
1583 }
1584
1585 int yaffs_inodecount(const YCHAR *path)
1586 {
1587         loff_t retVal= -1;
1588         yaffs_Device *dev=NULL;
1589         YCHAR *dummy;
1590
1591         yaffsfs_Lock();
1592         dev = yaffsfs_FindDevice(path,&dummy);
1593         if(dev  && dev->isMounted) {
1594            int nObjects = dev->nObjectsCreated - dev->nFreeObjects;
1595            if(nObjects > dev->nHardLinks)
1596                 retVal = nObjects - dev->nHardLinks;
1597         }
1598
1599         if(retVal < 0)
1600                 yaffsfs_SetError(-EINVAL);
1601
1602         yaffsfs_Unlock();
1603         return retVal;
1604 }
1605
1606
1607
1608 void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList)
1609 {
1610
1611         yaffsfs_DeviceConfiguration *cfg;
1612
1613         yaffsfs_configurationList = cfgList;
1614
1615         yaffsfs_InitHandles();
1616
1617         cfg = yaffsfs_configurationList;
1618
1619         while(cfg && cfg->prefix && cfg->dev){
1620                 cfg->dev->isMounted = 0;
1621                 cfg->dev->param.removeObjectCallback = yaffsfs_RemoveObjectCallback;
1622                 cfg++;
1623         }
1624
1625
1626 }
1627
1628
1629 /* Directory search stuff. */
1630
1631 /*
1632  * Directory search context
1633  *
1634  * NB this is an opaque structure.
1635  */
1636
1637
1638 typedef struct
1639 {
1640         __u32 magic;
1641         yaffs_dirent de;                /* directory entry being used by this dsc */
1642         YCHAR name[NAME_MAX+1];         /* name of directory being searched */
1643         yaffs_Object *dirObj;           /* ptr to directory being searched */
1644         yaffs_Object *nextReturn;       /* obj to be returned by next readddir */
1645         int offset;
1646         struct ylist_head others;
1647 } yaffsfs_DirectorySearchContext;
1648
1649
1650
1651 static struct ylist_head search_contexts;
1652
1653
1654 static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
1655 {
1656         if(dsc &&
1657            dsc->dirObj &&
1658            dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
1659
1660            dsc->offset = 0;
1661
1662            if( ylist_empty(&dsc->dirObj->variant.directoryVariant.children))
1663                 dsc->nextReturn = NULL;
1664            else
1665                 dsc->nextReturn = ylist_entry(dsc->dirObj->variant.directoryVariant.children.next,
1666                                                 yaffs_Object,siblings);
1667         } else {
1668                 /* Hey someone isn't playing nice! */
1669         }
1670 }
1671
1672 static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
1673 {
1674         if(dsc &&
1675            dsc->dirObj &&
1676            dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
1677
1678            if( dsc->nextReturn == NULL ||
1679                ylist_empty(&dsc->dirObj->variant.directoryVariant.children))
1680                 dsc->nextReturn = NULL;
1681            else {
1682                    struct ylist_head *next = dsc->nextReturn->siblings.next;
1683
1684                    if( next == &dsc->dirObj->variant.directoryVariant.children)
1685                         dsc->nextReturn = NULL; /* end of list */
1686                    else
1687                         dsc->nextReturn = ylist_entry(next,yaffs_Object,siblings);
1688            }
1689         } else {
1690                 /* Hey someone isn't playing nice! */
1691         }
1692 }
1693
1694 static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj)
1695 {
1696
1697         struct ylist_head *i;
1698         yaffsfs_DirectorySearchContext *dsc;
1699
1700         /* if search contexts not initilised then skip */
1701         if(!search_contexts.next)
1702                 return;
1703
1704         /* Iterate through the directory search contexts.
1705          * If any are the one being removed, then advance the dsc to
1706          * the next one to prevent a hanging ptr.
1707          */
1708          ylist_for_each(i, &search_contexts) {
1709                 if (i) {
1710                         dsc = ylist_entry(i, yaffsfs_DirectorySearchContext,others);
1711                         if(dsc->nextReturn == obj)
1712                                 yaffsfs_DirAdvance(dsc);
1713                 }
1714         }
1715
1716 }
1717
1718 yaffs_DIR *yaffs_opendir(const YCHAR *dirname)
1719 {
1720         yaffs_DIR *dir = NULL;
1721         yaffs_Object *obj = NULL;
1722         yaffsfs_DirectorySearchContext *dsc = NULL;
1723
1724         yaffsfs_Lock();
1725
1726         obj = yaffsfs_FindObject(NULL,dirname,0);
1727
1728         if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
1729
1730                 dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
1731                 dir = (yaffs_DIR *)dsc;
1732
1733                 if(dsc){
1734                         memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
1735                         dsc->magic = YAFFS_MAGIC;
1736                         dsc->dirObj = obj;
1737                         yaffs_strncpy(dsc->name,dirname,NAME_MAX);
1738                         YINIT_LIST_HEAD(&dsc->others);
1739
1740                         if(!search_contexts.next)
1741                                 YINIT_LIST_HEAD(&search_contexts);
1742
1743                         ylist_add(&dsc->others,&search_contexts);
1744                         yaffsfs_SetDirRewound(dsc);
1745                 }
1746
1747         }
1748
1749         yaffsfs_Unlock();
1750
1751         return dir;
1752 }
1753
1754 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
1755 {
1756         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1757         struct yaffs_dirent *retVal = NULL;
1758
1759         yaffsfs_Lock();
1760
1761         if(dsc && dsc->magic == YAFFS_MAGIC){
1762                 yaffsfs_SetError(0);
1763                 if(dsc->nextReturn){
1764                         dsc->de.d_ino = yaffs_GetEquivalentObject(dsc->nextReturn)->objectId;
1765                         dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
1766                         dsc->de.d_off = dsc->offset++;
1767                         yaffs_GetObjectName(dsc->nextReturn,dsc->de.d_name,NAME_MAX);
1768                         if(yaffs_strnlen(dsc->de.d_name,NAME_MAX+1) == 0)
1769                         {
1770                                 /* this should not happen! */
1771                                 yaffs_strcpy(dsc->de.d_name,_Y("zz"));
1772                         }
1773                         dsc->de.d_reclen = sizeof(struct yaffs_dirent);
1774                         retVal = &dsc->de;
1775                         yaffsfs_DirAdvance(dsc);
1776                 } else
1777                         retVal = NULL;
1778         } else
1779                 yaffsfs_SetError(-EBADF);
1780
1781         yaffsfs_Unlock();
1782
1783         return retVal;
1784
1785 }
1786
1787
1788 void yaffs_rewinddir(yaffs_DIR *dirp)
1789 {
1790         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1791
1792         yaffsfs_Lock();
1793
1794         yaffsfs_SetDirRewound(dsc);
1795
1796         yaffsfs_Unlock();
1797 }
1798
1799
1800 int yaffs_closedir(yaffs_DIR *dirp)
1801 {
1802         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1803
1804         yaffsfs_Lock();
1805         dsc->magic = 0;
1806         ylist_del(&dsc->others); /* unhook from list */
1807         YFREE(dsc);
1808         yaffsfs_Unlock();
1809         return 0;
1810 }
1811
1812 /* End of directory stuff */
1813
1814
1815 int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath)
1816 {
1817         yaffs_Object *parent = NULL;
1818         yaffs_Object *obj;
1819         YCHAR *name;
1820         int retVal= -1;
1821         int mode = 0; /* ignore for now */
1822
1823         yaffsfs_Lock();
1824         parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
1825         if(parent && parent->myDev->readOnly)
1826                 yaffsfs_SetError(-EINVAL);
1827         else if(parent){
1828                 obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
1829                 if(obj)
1830                         retVal = 0;
1831                 else{
1832                         yaffsfs_SetError(-ENOSPC); /* just assume no space for now */
1833                         retVal = -1;
1834                 }
1835         } else {
1836                 yaffsfs_SetError(-EINVAL);
1837                 retVal = -1;
1838         }
1839
1840         yaffsfs_Unlock();
1841
1842         return retVal;
1843
1844 }
1845
1846 int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz)
1847 {
1848         yaffs_Object *obj = NULL;
1849         int retVal;
1850
1851
1852         yaffsfs_Lock();
1853
1854         obj = yaffsfs_FindObject(NULL,path,0);
1855
1856         if(!obj) {
1857                 yaffsfs_SetError(-ENOENT);
1858                 retVal = -1;
1859         } else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK) {
1860                 yaffsfs_SetError(-EINVAL);
1861                 retVal = -1;
1862         } else {
1863                 YCHAR *alias = obj->variant.symLinkVariant.alias;
1864                 memset(buf,0,bufsiz);
1865                 yaffs_strncpy(buf,alias,bufsiz - 1);
1866                 retVal = 0;
1867         }
1868         yaffsfs_Unlock();
1869         return retVal;
1870 }
1871
1872 int yaffs_link(const YCHAR *oldpath, const YCHAR *newpath)
1873 {
1874         /* Creates a link called newpath to existing oldpath */
1875         yaffs_Object *obj = NULL;
1876         yaffs_Object *target = NULL;
1877         int retVal = 0;
1878         int newNameLength = 0;
1879
1880
1881         yaffsfs_Lock();
1882
1883         obj = yaffsfs_FindObject(NULL,oldpath,0);
1884         target = yaffsfs_FindObject(NULL,newpath,0);
1885
1886         if(!obj) {
1887                 yaffsfs_SetError(-ENOENT);
1888                 retVal = -1;
1889         } else if(obj->myDev->readOnly){
1890                 yaffsfs_SetError(-EINVAL);
1891                 retVal= -1;
1892         } else if(target) {
1893                 yaffsfs_SetError(-EEXIST);
1894                 retVal = -1;
1895         } else {
1896                 yaffs_Object *newdir = NULL;
1897                 yaffs_Object *link = NULL;
1898
1899                 YCHAR *newname;
1900
1901                 newdir = yaffsfs_FindDirectory(NULL,newpath,&newname,0);
1902
1903                 if(!newdir){
1904                         yaffsfs_SetError(-ENOTDIR);
1905                         retVal = -1;
1906                 }else if(newdir->myDev != obj->myDev){
1907                         yaffsfs_SetError(-EXDEV);
1908                         retVal = -1;
1909                 }
1910
1911                 newNameLength = yaffs_strnlen(newname,YAFFS_MAX_NAME_LENGTH+1);
1912
1913                 if(newNameLength == 0){
1914                         yaffsfs_SetError(-ENOENT);
1915                         retVal = -1;
1916                 } else if (newNameLength > YAFFS_MAX_NAME_LENGTH){
1917                         yaffsfs_SetError(-ENAMETOOLONG);
1918                         retVal = -1;
1919                 }
1920
1921                 if(retVal == 0) {
1922                         link = yaffs_Link(newdir,newname,obj);
1923                         if(link)
1924                                 retVal = 0;
1925                         else{
1926                                 yaffsfs_SetError(-ENOSPC);
1927                                 retVal = -1;
1928                         }
1929
1930                 }
1931         }
1932         yaffsfs_Unlock();
1933
1934         return retVal;
1935 }
1936
1937 int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev)
1938 {
1939         return -1;
1940 }
1941
1942 int yaffs_DumpDevStruct(const YCHAR *path)
1943 {
1944 #if 0
1945         YCHAR *rest;
1946
1947         yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
1948
1949         if(obj){
1950                 yaffs_Device *dev = obj->myDev;
1951
1952                 printf("\n"
1953                            "nPageWrites.......... %d\n"
1954                            "nPageReads........... %d\n"
1955                            "nBlockErasures....... %d\n"
1956                            "nGCCopies............ %d\n"
1957                            "garbageCollections... %d\n"
1958                            "passiveGarbageColl'ns %d\n"
1959                            "\n",
1960                                 dev->nPageWrites,
1961                                 dev->nPageReads,
1962                                 dev->nBlockErasures,
1963                                 dev->nGCCopies,
1964                                 dev->garbageCollections,
1965                                 dev->passiveGarbageCollections
1966                 );
1967
1968         }
1969
1970 #endif
1971         return 0;
1972 }
1973