direct/yaffsfs.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2010 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include "yaffsfs.h"
  15 #include "yaffs_guts.h"
  16 #include "yaffscfg.h"
  17 #include "yportenv.h"
  18 #include "yaffs_trace.h"
  19
  20 #include <string.h> /* for memset */
  21
  22 #define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
  23
  24 #ifndef NULL
  25 #define NULL ((void *)0)
  26 #endif
  27
  28
  29 /* YAFFSFS_RW_SIZE must be a power of 2 */
  30 #define YAFFSFS_RW_SHIFT (13)
  31 #define YAFFSFS_RW_SIZE  (1<<YAFFSFS_RW_SHIFT)
  32
  33 /* Some forward references */
  34 static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relativeDirectory,
  35                         const YCHAR *path,
  36                         int symDepth, int getEquiv,
  37                         struct yaffs_obj **dirOut,
  38                         int *notDir, int *loop);
  39
  40 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj);
  41
  42 unsigned int yaffs_wr_attempts;
  43
  44 /*
  45  * Handle management.
  46  * There are open inodes in yaffsfs_Inode.
  47  * There are open handles in yaffsfs_Handle.
  48  *
  49  * Things are structured this way to be like the Linux VFS model
  50  * so that interactions with the yaffs guts calls are similar.
  51  * That means more common code paths and less special code.
  52  * That means better testing etc.
  53  */
  54
  55 typedef struct {
  56         int count;      /* Number of handles accessing this inode */
  57         struct yaffs_obj *iObj;
  58 } yaffsfs_Inode;
  59
  60 typedef struct{
  61         u8      reading:1;
  62         u8      writing:1;
  63         u8      append:1;
  64         u8      shareRead:1;
  65         u8      shareWrite:1;
  66         int     inodeId:12;     /* Index to corresponding yaffsfs_Inode */
  67         int     useCount:10;    /* Use count for this handle */
  68         u32 position;           /* current position in file */
  69 }yaffsfs_Handle;
  70
  71 static yaffsfs_Inode yaffsfs_inode[YAFFSFS_N_HANDLES];
  72 static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
  73 static int yaffsfs_handlesInitialised;
  74
  75
  76 unsigned yaffs_set_trace(unsigned  tm)
  77 {
  78         yaffs_trace_mask = tm;
  79         return yaffs_trace_mask;
  80 }
  81
  82 unsigned yaffs_get_trace(void)
  83 {
  84         return yaffs_trace_mask;
  85 }
  86
  87 /*
  88  * yaffsfs_InitHandle
  89  * Inilitalise handle management on start-up.
  90  */
  91
  92 static void yaffsfs_InitHandles(void)
  93 {
  94         int i;
  95         if(yaffsfs_handlesInitialised)
  96                 return;
  97
  98         memset(yaffsfs_inode,0,sizeof(yaffsfs_inode));
  99         memset(yaffsfs_handle,0,sizeof(yaffsfs_handle));
 100         for(i = 0; i < YAFFSFS_N_HANDLES; i++)
 101                 yaffsfs_handle[i].inodeId = -1;
 102 }
 103
 104 yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
 105 {
 106         if(h < 0 || h >= YAFFSFS_N_HANDLES)
 107                 return NULL;
 108
 109         return &yaffsfs_handle[h];
 110 }
 111
 112 yaffsfs_Inode *yaffsfs_GetInodePointer(int handle)
 113 {
 114         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 115
 116         if(h && h->useCount > 0 && h->inodeId >= 0 && h->inodeId < YAFFSFS_N_HANDLES)
 117                 return  &yaffsfs_inode[h->inodeId];
 118
 119         return NULL;
 120 }
 121
 122 struct yaffs_obj *yaffsfs_GetHandleObject(int handle)
 123 {
 124         yaffsfs_Inode *in = yaffsfs_GetInodePointer(handle);
 125
 126         if(in)
 127                 return in->iObj;
 128
 129         return NULL;
 130 }
 131
 132 /*
 133  * yaffsfs_FindInodeIdForObject
 134  * Find the inode entry for an object, if it exists.
 135  */
 136
 137 static int yaffsfs_FindInodeIdForObject(struct yaffs_obj *obj)
 138 {
 139         int i;
 140         int ret = -1;
 141
 142         if(obj)
 143                 obj = yaffs_get_equivalent_obj(obj);
 144
 145         /* Look for it in open inode table*/
 146         for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
 147                 if(yaffsfs_inode[i].iObj == obj)
 148                         ret = i;
 149         }
 150         return ret;
 151 }
 152
 153 /*
 154  * yaffsfs_GetInodeIdForObject
 155  * Grab an inode entry when opening a new inode.
 156  */
 157 static int yaffsfs_GetInodeIdForObject(struct yaffs_obj *obj)
 158 {
 159         int i;
 160         int ret;
 161         yaffsfs_Inode *in = NULL;
 162
 163         if(obj)
 164                 obj = yaffs_get_equivalent_obj(obj);
 165
 166         ret = yaffsfs_FindInodeIdForObject(obj);
 167
 168         for(i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++){
 169                 if(!yaffsfs_inode[i].iObj)
 170                         ret = i;
 171         }
 172
 173         if(ret>=0){
 174                 in = &yaffsfs_inode[ret];
 175                 if(!in->iObj)
 176                         in->count = 0;
 177                 in->iObj = obj;
 178                 in->count++;
 179         }
 180
 181
 182         return ret;
 183 }
 184
 185
 186 static int yaffsfs_CountHandles(struct yaffs_obj *obj)
 187 {
 188         int i = yaffsfs_FindInodeIdForObject(obj);
 189
 190         if(i >= 0)
 191                 return yaffsfs_inode[i].count;
 192         else
 193                 return 0;
 194 }
 195
 196 static void yaffsfs_ReleaseInode(yaffsfs_Inode *in)
 197 {
 198         struct yaffs_obj *obj;
 199
 200         obj = in->iObj;
 201
 202         if(obj->unlinked)
 203                 yaffs_del_obj(obj);
 204
 205         obj->my_inode = NULL;
 206         in->iObj = NULL;
 207
 208 }
 209
 210 static void yaffsfs_PutInode(int inodeId)
 211 {
 212         if(inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES){
 213                 yaffsfs_Inode *in = & yaffsfs_inode[inodeId];
 214                 in->count--;
 215                 if(in->count <= 0){
 216                         yaffsfs_ReleaseInode(in);
 217                         in->count = 0;
 218                 }
 219         }
 220 }
 221
 222
 223 /*
 224  * yaffsfs_GetHandle
 225  * Grab a handle (when opening a file)
 226  */
 227
 228 static int yaffsfs_GetNewHandle(void)
 229 {
 230         int i;
 231         yaffsfs_Handle *h;
 232
 233         for(i = 0; i < YAFFSFS_N_HANDLES; i++){
 234                 h = yaffsfs_GetHandlePointer(i);
 235                 if(!h){
 236                         /* todo bug: should never happen */
 237                 }
 238                 if(h->useCount < 1){
 239                         memset(h,0,sizeof(yaffsfs_Handle));
 240                         h->inodeId=-1;
 241                         h->useCount=1;
 242                         return i;
 243                 }
 244         }
 245         return -1;
 246 }
 247
 248 /*
 249  * yaffs_get_handle
 250  * Increase use of handle when reading/writing a file
 251  */
 252 static int yaffsfs_GetHandle(int handle)
 253 {
 254         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 255
 256         if(h && h->useCount > 0){
 257                 h->useCount++;
 258         }
 259         return 0;
 260 }
 261
 262 /*
 263  * yaffs_put_handle
 264  * Let go of a handle when closing a file or aborting an open or
 265  * ending a read or write.
 266  */
 267 static int yaffsfs_PutHandle(int handle)
 268 {
 269         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 270
 271         if(h && h->useCount > 0){
 272                 h->useCount--;
 273                 if(h->useCount < 1){
 274                         if(h->inodeId >= 0){
 275                                 yaffsfs_PutInode(h->inodeId);
 276                                 h->inodeId = -1;
 277                         }
 278                 }
 279         }
 280         return 0;
 281 }
 282
 283 static void yaffsfs_BreakDeviceHandles(struct yaffs_dev *dev)
 284 {
 285         yaffsfs_Handle *h;
 286         struct yaffs_obj *obj;
 287         int i;
 288         for(i = 0; i < YAFFSFS_N_HANDLES; i++){
 289                 h = yaffsfs_GetHandlePointer(i);
 290                 obj = yaffsfs_GetHandleObject(i);
 291                 if(h && h->useCount>0 && obj && obj->my_dev == dev){
 292                         h->useCount = 0;
 293                         yaffsfs_PutInode(h->inodeId);
 294                         h->inodeId = -1;
 295                 }
 296         }
 297 }
 298
 299
 300
 301
 302 /*
 303  *  Stuff to handle names.
 304  */
 305
 306
 307 int yaffsfs_Match(YCHAR a, YCHAR b)
 308 {
 309         /* case sensitive */
 310         return (a == b);
 311 }
 312
 313 int yaffsfs_IsPathDivider(YCHAR ch)
 314 {
 315         const YCHAR *str = YAFFS_PATH_DIVIDERS;
 316
 317         while(*str){
 318                 if(*str == ch)
 319                         return 1;
 320                 str++;
 321         }
 322
 323         return 0;
 324 }
 325
 326 int yaffsfs_CheckNameLength(const char *name)
 327 {
 328         int retVal = 0;
 329
 330         int nameLength = yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH+1);
 331
 332         if(nameLength == 0){
 333                 yaffsfs_SetError(-ENOENT);
 334                 retVal = -1;
 335         } else if (nameLength > YAFFS_MAX_NAME_LENGTH){
 336                 yaffsfs_SetError(-ENAMETOOLONG);
 337                 retVal = -1;
 338         }
 339
 340         return retVal;
 341 }
 342
 343
 344 static int yaffsfs_alt_dir_path(const YCHAR *path, YCHAR **ret_path)
 345 {
 346         YCHAR *alt_path = NULL;
 347         int path_length;
 348         int i;
 349
 350         /*
 351          * We don't have a definition for max path length.
 352          * We will use 3 * max name length instead.
 353          */
 354         *ret_path = NULL;
 355         path_length = strnlen(path,(YAFFS_MAX_NAME_LENGTH+1)*3 +1);
 356
 357         /* If the last character is a path divider, then we need to
 358          * trim it back so that the name look-up works properly.
 359          * eg. /foo/new_dir/ -> /foo/newdir
 360          * Curveball: Need to handle multiple path dividers:
 361          * eg. /foof/sdfse///// -> /foo/sdfse
 362          */
 363         if(path_length > 0 &&
 364                 yaffsfs_IsPathDivider(path[path_length-1])){
 365                 alt_path = YMALLOC(path_length + 1);
 366                 if(!alt_path)
 367                         return -1;
 368                 strcpy(alt_path, path);
 369                 for(i = path_length-1;
 370                         i >= 0 && yaffsfs_IsPathDivider(alt_path[i]);
 371                         i--)
 372                         alt_path[i] = (YCHAR) 0;
 373         }
 374         *ret_path = alt_path;
 375         return 0;
 376 }
 377
 378
 379 LIST_HEAD(yaffsfs_deviceList);
 380
 381 /*
 382  * yaffsfs_FindDevice
 383  * yaffsfs_FindRoot
 384  * Scan the configuration list to find the device
 385  * Curveballs: Should match paths that end in '/' too
 386  * Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
 387  */
 388 static struct yaffs_dev *yaffsfs_FindDevice(const YCHAR *path, YCHAR **restOfPath)
 389 {
 390         struct list_head *cfg;
 391         const YCHAR *leftOver;
 392         const YCHAR *p;
 393         struct yaffs_dev *retval = NULL;
 394         struct yaffs_dev *dev = NULL;
 395         int thisMatchLength;
 396         int longestMatch = -1;
 397         int matching;
 398
 399         /*
 400          * Check all configs, choose the one that:
 401          * 1) Actually matches a prefix (ie /a amd /abc will not match
 402          * 2) Matches the longest.
 403          */
 404         list_for_each(cfg, &yaffsfs_deviceList){
 405                 dev = list_entry(cfg, struct yaffs_dev, dev_list);
 406                 leftOver = path;
 407                 p = dev->param.name;
 408                 thisMatchLength = 0;
 409                 matching = 1;
 410
 411
 412                 while(matching && *p && *leftOver){
 413                         /* Skip over any /s */
 414                         while(yaffsfs_IsPathDivider(*p))
 415                               p++;
 416
 417                         /* Skip over any /s */
 418                         while(yaffsfs_IsPathDivider(*leftOver))
 419                               leftOver++;
 420
 421                         /* Now match the text part */
 422                         while(matching &&
 423                               *p && !yaffsfs_IsPathDivider(*p) &&
 424                               *leftOver && !yaffsfs_IsPathDivider(*leftOver)){
 425                                 if(yaffsfs_Match(*p,*leftOver)){
 426                                         p++;
 427                                         leftOver++;
 428                                         thisMatchLength++;
 429                                 } else {
 430                                         matching = 0;
 431                                 }
 432                         }
 433                 }
 434
 435                 /* Skip over any /s in leftOver */
 436                 while(yaffsfs_IsPathDivider(*leftOver))
 437                       leftOver++;
 438
 439                 // Skip over any /s in p
 440                 while(yaffsfs_IsPathDivider(*p))
 441                       p++;
 442
 443                 // p should now be at the end of the string (ie. fully matched)
 444                 if(*p)
 445                         matching = 0;
 446
 447                 if( matching && (thisMatchLength > longestMatch))
 448                 {
 449                         // Matched prefix
 450                         *restOfPath = (YCHAR *)leftOver;
 451                         retval = dev;
 452                         longestMatch = thisMatchLength;
 453                 }
 454
 455         }
 456         return retval;
 457 }
 458
 459 static int yaffsfs_CheckPath(const YCHAR *path)
 460 {
 461         int n=0;
 462         int divs=0;
 463         while(*path && n < YAFFS_MAX_NAME_LENGTH && divs < 100){
 464                 if(yaffsfs_IsPathDivider(*path)){
 465                         n=0;
 466                         divs++;
 467                 } else
 468                         n++;
 469                 path++;
 470         }
 471
 472         return (*path) ? -1 : 0;
 473 }
 474
 475 /* FindMountPoint only returns a dev entry if the path is a mount point */
 476 static struct yaffs_dev *yaffsfs_FindMountPoint(const YCHAR *path)
 477 {
 478         struct yaffs_dev *dev;
 479         YCHAR *restOfPath=NULL;
 480         dev = yaffsfs_FindDevice(path,&restOfPath);
 481         if(dev && restOfPath && *restOfPath)
 482                 dev = NULL;
 483         return dev;
 484 }
 485
 486 static struct yaffs_obj *yaffsfs_FindRoot(const YCHAR *path, YCHAR **restOfPath)
 487 {
 488
 489         struct yaffs_dev *dev;
 490
 491         dev= yaffsfs_FindDevice(path,restOfPath);
 492         if(dev && dev->is_mounted){
 493                 return dev->root_dir;
 494         }
 495         return NULL;
 496 }
 497
 498 static struct yaffs_obj *yaffsfs_FollowLink(struct yaffs_obj *obj,
 499                                         int symDepth, int *loop)
 500 {
 501
 502         if(obj)
 503                 obj = yaffs_get_equivalent_obj(obj);
 504
 505         while(obj && obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK){
 506                 YCHAR *alias = obj->variant.symlink_variant.alias;
 507
 508                 if(yaffsfs_IsPathDivider(*alias))
 509                         /* Starts with a /, need to scan from root up */
 510                         obj = yaffsfs_FindObject(NULL,alias,symDepth++,
 511                                                 1,NULL,NULL,loop);
 512                 else
 513                         /* Relative to here, so use the parent of the symlink as a start */
 514                         obj = yaffsfs_FindObject(obj->parent,alias,symDepth++,
 515                                                 1,NULL,NULL,loop);
 516         }
 517         return obj;
 518 }
 519
 520
 521 /*
 522  * yaffsfs_FindDirectory
 523  * Parse a path to determine the directory and the name within the directory.
 524  *
 525  * eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
 526  */
 527 static struct yaffs_obj *yaffsfs_DoFindDirectory(struct yaffs_obj *startDir,
 528                                 const YCHAR *path, YCHAR **name, int symDepth,
 529                                 int *notDir,int *loop)
 530 {
 531         struct yaffs_obj *dir;
 532         YCHAR *restOfPath;
 533         YCHAR str[YAFFS_MAX_NAME_LENGTH+1];
 534         int i;
 535
 536         if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES){
 537                 if(loop)
 538                         *loop = 1;
 539                 return NULL;
 540         }
 541
 542         if(startDir){
 543                 dir = startDir;
 544                 restOfPath = (YCHAR *)path;
 545         }
 546         else
 547                 dir = yaffsfs_FindRoot(path,&restOfPath);
 548
 549
 550         while(dir){
 551                 /*
 552                  * parse off /.
 553                  * curve ball: also throw away surplus '/'
 554                  * eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
 555                  */
 556                 while(yaffsfs_IsPathDivider(*restOfPath))
 557                         restOfPath++; /* get rid of '/' */
 558
 559                 *name = restOfPath;
 560                 i = 0;
 561
 562                 while(*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)){
 563                         if (i < YAFFS_MAX_NAME_LENGTH){
 564                                 str[i] = *restOfPath;
 565                                 str[i+1] = '\0';
 566                                 i++;
 567                         }
 568                         restOfPath++;
 569                 }
 570
 571                 if(!*restOfPath)
 572                         /* got to the end of the string */
 573                         return dir;
 574                 else{
 575                         if(yaffs_strcmp(str,_Y(".")) == 0)
 576                         {
 577                                 /* Do nothing */
 578                         }
 579                         else if(yaffs_strcmp(str,_Y("..")) == 0)
 580                                 dir = dir->parent;
 581                         else{
 582                                 dir = yaffs_find_by_name(dir,str);
 583
 584                                 dir = yaffsfs_FollowLink(dir,symDepth,loop);
 585
 586                                 if(dir && dir->variant_type !=
 587                                         YAFFS_OBJECT_TYPE_DIRECTORY){
 588                                         if(notDir)
 589                                                 *notDir = 1;
 590                                         dir = NULL;
 591                                 }
 592
 593                         }
 594                 }
 595         }
 596         /* directory did not exist. */
 597         return NULL;
 598 }
 599
 600 static struct yaffs_obj *yaffsfs_FindDirectory(struct yaffs_obj *relDir,
 601                                         const YCHAR *path,
 602                                         YCHAR **name,
 603                                         int symDepth,
 604                                         int *notDir,
 605                                         int *loop)
 606 {
 607         return yaffsfs_DoFindDirectory(relDir,path,name,symDepth,notDir,loop);
 608 }
 609
 610 /*
 611  * yaffsfs_FindObject turns a path for an existing object into the object
 612  */
 613 static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relDir,
 614                         const YCHAR *path,int symDepth, int getEquiv,
 615                         struct yaffs_obj **dirOut, int *notDir,int *loop)
 616 {
 617         struct yaffs_obj *dir;
 618         struct yaffs_obj *obj;
 619         YCHAR *name;
 620
 621         dir = yaffsfs_FindDirectory(relDir,path,&name,symDepth,notDir,loop);
 622
 623         if(dirOut)
 624                 *dirOut =  dir;
 625
 626         if(dir && *name)
 627                 obj = yaffs_find_by_name(dir,name);
 628         else
 629                 obj = dir;
 630
 631         if(getEquiv)
 632                 obj = yaffs_get_equivalent_obj(obj);
 633
 634         return obj;
 635 }
 636
 637
 638 int yaffs_dup(int fd)
 639 {
 640         int newHandle = -1;
 641         yaffsfs_Handle *oldPtr = NULL;
 642         yaffsfs_Handle *newPtr = NULL;
 643
 644         yaffsfs_Lock();
 645
 646         oldPtr = yaffsfs_GetHandlePointer(fd);
 647         if(oldPtr && oldPtr->useCount > 0)
 648                 newHandle = yaffsfs_GetNewHandle();
 649         if(newHandle >= 0)
 650                 newPtr = yaffsfs_GetHandlePointer(newHandle);
 651
 652         if(newPtr){
 653                 *newPtr = *oldPtr;
 654                 return newHandle;
 655         }
 656
 657         if(!oldPtr)
 658                 yaffsfs_SetError(-EBADF);
 659         else
 660                 yaffsfs_SetError(-ENOMEM);
 661
 662         return -1;
 663
 664 }
 665
 666
 667
 668 int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int sharing)
 669 {
 670         struct yaffs_obj *obj = NULL;
 671         struct yaffs_obj *dir = NULL;
 672         YCHAR *name;
 673         int handle = -1;
 674         yaffsfs_Handle *yh = NULL;
 675         int openDenied = 0;
 676         int symDepth = 0;
 677         int errorReported = 0;
 678         int rwflags = oflag & ( O_RDWR | O_RDONLY | O_WRONLY);
 679         u8 shareRead = (sharing & YAFFS_SHARE_READ) ?  1 : 0;
 680         u8 shareWrite = (sharing & YAFFS_SHARE_WRITE) ? 1 : 0;
 681         u8 sharedReadAllowed;
 682         u8 sharedWriteAllowed;
 683         u8 alreadyReading;
 684         u8 alreadyWriting;
 685         u8 readRequested;
 686         u8 writeRequested;
 687         int notDir = 0;
 688         int loop = 0;
 689
 690         if(yaffsfs_CheckPath(path) < 0){
 691                 yaffsfs_SetError(-ENAMETOOLONG);
 692                 return -1;
 693         }
 694
 695         /* O_EXCL only has meaning if O_CREAT is specified */
 696         if(!(oflag & O_CREAT))
 697                 oflag &= ~(O_EXCL);
 698
 699         /* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
 700         if( (oflag & O_CREAT) & (oflag & O_EXCL))
 701                 oflag &= ~(O_TRUNC);
 702
 703         /* Todo: Are there any more flag combos to sanitise ? */
 704
 705         /* Figure out if reading or writing is requested */
 706
 707         readRequested = (rwflags == O_RDWR || rwflags == O_RDONLY) ? 1 : 0;
 708         writeRequested = (rwflags == O_RDWR || rwflags == O_WRONLY) ? 1 : 0;
 709
 710         yaffsfs_Lock();
 711
 712         handle = yaffsfs_GetNewHandle();
 713
 714         if(handle < 0){
 715                 yaffsfs_SetError(-ENFILE);
 716                 errorReported = 1;
 717         } else {
 718
 719                 yh = yaffsfs_GetHandlePointer(handle);
 720
 721                 /* try to find the exisiting object */
 722                 obj = yaffsfs_FindObject(NULL,path,0,1,NULL,NULL,NULL);
 723
 724                 obj = yaffsfs_FollowLink(obj,symDepth++,&loop);
 725
 726                 if(obj &&
 727                         obj->variant_type != YAFFS_OBJECT_TYPE_FILE &&
 728                         obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
 729                         obj = NULL;
 730
 731
 732                 if(obj){
 733
 734                         /* The file already exists or it might be a directory */
 735
 736                         /* If it is a directory then we can't open it as a file */
 737                         if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
 738                                 openDenied = 1;
 739                                 yaffsfs_SetError(-EISDIR);
 740                                 errorReported = 1;
 741                         }
 742
 743                         /* Open should fail if O_CREAT and O_EXCL are specified since
 744                          * the file exists
 745                          */
 746                         if(!errorReported && (oflag & O_EXCL) && (oflag & O_CREAT)){
 747                                 openDenied = 1;
 748                                 yaffsfs_SetError(-EEXIST);
 749                                 errorReported = 1;
 750                         }
 751
 752                         /* Check file permissions */
 753                         if( readRequested && !(obj->yst_mode & S_IREAD))
 754                                 openDenied = 1;
 755
 756                         if( writeRequested && !(obj->yst_mode & S_IWRITE))
 757                                 openDenied = 1;
 758
 759                         if( !errorReported && writeRequested &&
 760                                 obj->my_dev->read_only){
 761                                 openDenied = 1;
 762                                 yaffsfs_SetError(-EROFS);
 763                                 errorReported = 1;
 764                         }
 765
 766                         if(openDenied && !errorReported ) {
 767                                 /* Error if the file exists but permissions are refused. */
 768                                 yaffsfs_SetError(-EACCES);
 769                                 errorReported = 1;
 770                         }
 771
 772                         /* Check sharing of an existing object. */
 773                         if(!openDenied){
 774                                 yaffsfs_Handle *hx;
 775                                 int i;
 776                                 sharedReadAllowed = 1;
 777                                 sharedWriteAllowed = 1;
 778                                 alreadyReading = 0;
 779                                 alreadyWriting = 0;
 780                                 for( i = 0; i < YAFFSFS_N_HANDLES; i++){
 781                                         hx = &yaffsfs_handle[i];
 782                                         if(hx->useCount > 0 &&
 783                                                 hx->inodeId >= 0 &&
 784                                                 yaffsfs_inode[hx->inodeId].iObj == obj){
 785                                                 if(!hx->shareRead)
 786                                                         sharedReadAllowed = 0;
 787                                                 if(!hx->shareWrite)
 788                                                         sharedWriteAllowed = 0;
 789                                                 if(hx->reading)
 790                                                         alreadyReading = 1;
 791                                                 if(hx->writing)
 792                                                         alreadyWriting = 1;
 793                                         }
 794                                 }
 795
 796
 797
 798                                 if((!sharedReadAllowed && readRequested)||
 799                                         (!shareRead  && alreadyReading) ||
 800                                         (!sharedWriteAllowed && writeRequested) ||
 801                                         (!shareWrite && alreadyWriting)){
 802                                         openDenied = 1;
 803                                         yaffsfs_SetError(-EBUSY);
 804                                         errorReported=1;
 805                                 }
 806                         }
 807
 808                 }
 809
 810                 /* If we could not open an existing object, then let's see if
 811                  * the directory exists. If not, error.
 812                  */
 813                 if(!obj && !errorReported){
 814                         dir = yaffsfs_FindDirectory(NULL,path,&name,0,&notDir,&loop);
 815                         if(!dir && notDir){
 816                                 yaffsfs_SetError(-ENOTDIR);
 817                                 errorReported = 1;
 818                         } else if(loop){
 819                                 yaffsfs_SetError(-ELOOP);
 820                                 errorReported = 1;
 821                         } else  if(!dir){
 822                                 yaffsfs_SetError(-ENOENT);
 823                                 errorReported = 1;
 824                         }
 825                 }
 826
 827                 if(!obj && dir && !errorReported && (oflag & O_CREAT)) {
 828                         /* Let's see if we can create this file if it does not exist. */
 829                         if(dir->my_dev->read_only){
 830                                 yaffsfs_SetError(-EROFS);
 831                                 errorReported = 1;
 832                         } else
 833                                 obj = yaffs_create_file(dir,name,mode,0,0);
 834
 835                         if(!obj && !errorReported){
 836                                 yaffsfs_SetError(-ENOSPC);
 837                                 errorReported = 1;
 838                         }
 839                 }
 840
 841                 if(!obj && dir && !errorReported && !(oflag & O_CREAT)) {
 842                         /* Error if the file does not exist and CREAT is not set. */
 843                         yaffsfs_SetError(-ENOENT);
 844                         errorReported = 1;
 845                 }
 846
 847                 if(obj && !openDenied) {
 848                         int inodeId = yaffsfs_GetInodeIdForObject(obj);
 849
 850                         if(inodeId<0) {
 851                                 /*
 852                                  * Todo: Fix any problem if inodes run out, though that
 853                                  * can't happen if the number of inode items >= number of handles.
 854                                  */
 855                         }
 856
 857                         yh->inodeId = inodeId;
 858                         yh->reading = readRequested;
 859                         yh->writing = writeRequested;
 860                         yh->append =  (oflag & O_APPEND) ? 1 : 0;
 861                         yh->position = 0;
 862                         yh->shareRead = shareRead;
 863                         yh->shareWrite = shareWrite;
 864
 865                         /* Hook inode to object */
 866                         obj->my_inode = (void*) &yaffsfs_inode[inodeId];
 867
 868                         if((oflag & O_TRUNC) && yh->writing)
 869                                 yaffs_resize_file(obj,0);
 870                 } else {
 871                         yaffsfs_PutHandle(handle);
 872                         if(!errorReported)
 873                                 yaffsfs_SetError(0); /* Problem */
 874                         handle = -1;
 875                 }
 876         }
 877
 878         yaffsfs_Unlock();
 879
 880         return handle;
 881 }
 882
 883 int yaffs_open(const YCHAR *path, int oflag, int mode)
 884 {
 885         return yaffs_open_sharing(path, oflag, mode, YAFFS_SHARE_READ | YAFFS_SHARE_WRITE);
 886 }
 887
 888 int yaffs_Dofsync(int fd,int datasync)
 889 {
 890         yaffsfs_Handle *h = NULL;
 891         int retVal = -1;
 892
 893         yaffsfs_Lock();
 894
 895         h = yaffsfs_GetHandlePointer(fd);
 896
 897         if(!h || h->useCount < 1)
 898                 yaffsfs_SetError(-EBADF);
 899         else {
 900                 struct yaffs_obj * obj;
 901                 obj = yaffsfs_inode[h->inodeId].iObj;
 902                 if(obj->my_dev->read_only)
 903                         yaffsfs_SetError(-EROFS);
 904                 else {
 905                         yaffs_flush_file(yaffsfs_inode[h->inodeId].iObj,1,datasync);
 906                         retVal = 0;
 907                 }
 908         }
 909
 910         yaffsfs_Unlock();
 911
 912         return retVal;
 913 }
 914
 915 int yaffs_fsync(int fd)
 916 {
 917         return yaffs_Dofsync(fd,0);
 918 }
 919
 920 int yaffs_flush(int fd)
 921 {
 922         return yaffs_fsync(fd);
 923 }
 924
 925 int yaffs_fdatasync(int fd)
 926 {
 927         return yaffs_Dofsync(fd,1);
 928 }
 929
 930 int yaffs_close(int fd)
 931 {
 932         yaffsfs_Handle *h = NULL;
 933         int retVal = 0;
 934
 935         yaffsfs_Lock();
 936
 937         h = yaffsfs_GetHandlePointer(fd);
 938
 939         if(h && h->useCount > 0) {
 940                 /* clean up */
 941                 yaffs_flush_file(yaffsfs_inode[h->inodeId].iObj,1,0);
 942                 yaffsfs_PutHandle(fd);
 943                 retVal = 0;
 944         } else {
 945                 /* bad handle */
 946                 yaffsfs_SetError(-EBADF);
 947                 retVal = -1;
 948         }
 949
 950         yaffsfs_Unlock();
 951
 952         return retVal;
 953 }
 954
 955
 956
 957 int yaffsfs_do_read(int fd, void *vbuf, unsigned int nbyte, int isPread, int offset)
 958 {
 959         yaffsfs_Handle *h = NULL;
 960         struct yaffs_obj *obj = NULL;
 961         int pos = 0;
 962         int startPos = 0;
 963         int endPos = 0;
 964         int nRead = 0;
 965         int nToRead = 0;
 966         int totalRead = 0;
 967         unsigned int maxRead;
 968         u8 *buf = (u8 *)vbuf;
 969
 970         yaffsfs_Lock();
 971         h = yaffsfs_GetHandlePointer(fd);
 972         obj = yaffsfs_GetHandleObject(fd);
 973
 974         if(!h || !obj){
 975                 /* bad handle */
 976                 yaffsfs_SetError(-EBADF);
 977                 totalRead = -1;
 978         } else if(!h->reading){
 979                 /* Not a reading handle */
 980                 yaffsfs_SetError(-EINVAL);
 981                 totalRead = -1;
 982         } else if(nbyte > YAFFS_MAX_FILE_SIZE){
 983                 yaffsfs_SetError(-EINVAL);
 984                 totalRead = -1;
 985         } else {
 986                 if(isPread)
 987                         startPos = offset;
 988                 else
 989                         startPos = h->position;
 990
 991                 pos = startPos;
 992
 993                 if(yaffs_get_obj_length(obj) > pos)
 994                         maxRead = yaffs_get_obj_length(obj) - pos;
 995                 else
 996                         maxRead = 0;
 997
 998                 if(nbyte > maxRead)
 999                         nbyte = maxRead;
1000
1001
1002                 yaffsfs_GetHandle(fd);
1003
1004                 endPos = pos + nbyte;
1005
1006                 if(pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
1007                         nbyte > YAFFS_MAX_FILE_SIZE ||
1008                         endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE){
1009                         totalRead = -1;
1010                         nbyte = 0;
1011                 }
1012
1013                 while(nbyte > 0) {
1014                         nToRead = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
1015                         if(nToRead > nbyte)
1016                                 nToRead = nbyte;
1017
1018                         /* Tricky bit...
1019                          * Need to reverify object in case the device was
1020                          * unmounted in another thread.
1021                          */
1022                         obj = yaffsfs_GetHandleObject(fd);
1023                         if(!obj)
1024                                 nRead = 0;
1025                         else
1026                                 nRead = yaffs_file_rd(obj,buf,pos,nToRead);
1027
1028                         if(nRead > 0){
1029                                 totalRead += nRead;
1030                                 pos += nRead;
1031                                 buf += nRead;
1032                         }
1033
1034                         if(nRead == nToRead)
1035                                 nbyte-=nRead;
1036                         else
1037                                 nbyte = 0; /* no more to read */
1038
1039
1040                         if(nbyte > 0){
1041                                 yaffsfs_Unlock();
1042                                 yaffsfs_Lock();
1043                         }
1044
1045                 }
1046
1047                 yaffsfs_PutHandle(fd);
1048
1049                 if(!isPread) {
1050                         if(totalRead >= 0)
1051                                 h->position = startPos + totalRead;
1052                         else
1053                                 yaffsfs_SetError(-EINVAL);
1054                 }
1055
1056         }
1057
1058         yaffsfs_Unlock();
1059
1060         return (totalRead >= 0) ? totalRead : -1;
1061
1062 }
1063
1064 int yaffs_read(int fd, void *buf, unsigned int nbyte)
1065 {
1066         return yaffsfs_do_read(fd, buf, nbyte, 0, 0);
1067 }
1068
1069 int yaffs_pread(int fd, void *buf, unsigned int nbyte, unsigned int offset)
1070 {
1071         return yaffsfs_do_read(fd, buf, nbyte, 1, offset);
1072 }
1073
1074 int yaffsfs_do_write(int fd, const void *vbuf, unsigned int nbyte, int isPwrite, int offset)
1075 {
1076         yaffsfs_Handle *h = NULL;
1077         struct yaffs_obj *obj = NULL;
1078         int pos = 0;
1079         int startPos = 0;
1080         int endPos;
1081         int nWritten = 0;
1082         int totalWritten = 0;
1083         int write_trhrough = 0;
1084         int nToWrite = 0;
1085         const u8 *buf = (const u8 *)vbuf;
1086
1087         yaffsfs_Lock();
1088         h = yaffsfs_GetHandlePointer(fd);
1089         obj = yaffsfs_GetHandleObject(fd);
1090
1091         if(!h || !obj){
1092                 /* bad handle */
1093                 yaffsfs_SetError(-EBADF);
1094                 totalWritten = -1;
1095         } else if( h && obj && (!h->writing || obj->my_dev->read_only)){
1096                 yaffsfs_SetError(-EINVAL);
1097                 totalWritten=-1;
1098         } else {
1099                 if(h->append)
1100                         startPos = yaffs_get_obj_length(obj);
1101                 else if(isPwrite)
1102                         startPos = offset;
1103                 else
1104                         startPos = h->position;
1105
1106                 yaffsfs_GetHandle(fd);
1107                 pos = startPos;
1108                 endPos = pos + nbyte;
1109
1110                 if(pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
1111                         nbyte > YAFFS_MAX_FILE_SIZE ||
1112                         endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE){
1113                         totalWritten = -1;
1114                         nbyte = 0;
1115                 }
1116
1117                 while(nbyte > 0) {
1118
1119                         nToWrite = YAFFSFS_RW_SIZE - (pos & (YAFFSFS_RW_SIZE -1));
1120                         if(nToWrite > nbyte)
1121                                 nToWrite = nbyte;
1122
1123                         /* Tricky bit...
1124                          * Need to reverify object in case the device was
1125                          * remounted or unmounted in another thread.
1126                          */
1127                         obj = yaffsfs_GetHandleObject(fd);
1128                         if(!obj || obj->my_dev->read_only)
1129                                 nWritten = 0;
1130                         else
1131                                 nWritten = yaffs_wr_file(obj,buf,pos,nToWrite,
1132                                                         write_trhrough);
1133                         if(nWritten > 0){
1134                                 totalWritten += nWritten;
1135                                 pos += nWritten;
1136                                 buf += nWritten;
1137                         }
1138
1139                         if(nWritten == nToWrite)
1140                                 nbyte -= nToWrite;
1141                         else
1142                                 nbyte = 0;
1143
1144                         if(nWritten < 1 && totalWritten < 1){
1145                                 yaffsfs_SetError(-ENOSPC);
1146                                 totalWritten = -1;
1147                         }
1148
1149                         if(nbyte > 0){
1150                                 yaffsfs_Unlock();
1151                                 yaffsfs_Lock();
1152                         }
1153                 }
1154
1155                 yaffsfs_PutHandle(fd);
1156
1157                 if(!isPwrite){
1158                         if(totalWritten > 0)
1159                                 h->position = startPos + totalWritten;
1160                         else
1161                                 yaffsfs_SetError(-EINVAL);
1162                 }
1163         }
1164
1165         yaffsfs_Unlock();
1166
1167         return (totalWritten >= 0) ? totalWritten : -1;
1168 }
1169
1170 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
1171 {
1172         return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
1173 }
1174
1175 int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, unsigned int offset)
1176 {
1177         return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
1178 }
1179
1180
1181 int yaffs_truncate(const YCHAR *path,off_t new_size)
1182 {
1183         struct yaffs_obj *obj = NULL;
1184         struct yaffs_obj *dir = NULL;
1185         int result = YAFFS_FAIL;
1186         int notDir = 0;
1187         int loop = 0;
1188
1189         if(yaffsfs_CheckPath(path) < 0){
1190                 yaffsfs_SetError(-ENAMETOOLONG);
1191                 return -1;
1192         }
1193
1194         yaffsfs_Lock();
1195
1196         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1197         obj = yaffsfs_FollowLink(obj,0,&loop);
1198
1199         if(!dir && notDir)
1200                 yaffsfs_SetError(-ENOTDIR);
1201         else if(loop)
1202                 yaffsfs_SetError(-ELOOP);
1203         else if(!dir || !obj)
1204                 yaffsfs_SetError(-ENOENT);
1205         else if(obj->my_dev->read_only)
1206                 yaffsfs_SetError(-EROFS);
1207         else if(obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
1208                 yaffsfs_SetError(-EISDIR);
1209         else if(obj->my_dev->read_only)
1210                 yaffsfs_SetError(-EACCES);
1211         else if(new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
1212                 yaffsfs_SetError(-EINVAL);
1213         else
1214                 result = yaffs_resize_file(obj,new_size);
1215
1216         yaffsfs_Unlock();
1217
1218         return (result) ? 0 : -1;
1219 }
1220
1221 int yaffs_ftruncate(int fd, off_t new_size)
1222 {
1223         yaffsfs_Handle *h = NULL;
1224         struct yaffs_obj *obj = NULL;
1225         int result = 0;
1226
1227         yaffsfs_Lock();
1228         h = yaffsfs_GetHandlePointer(fd);
1229         obj = yaffsfs_GetHandleObject(fd);
1230
1231         if(!h || !obj)
1232                 /* bad handle */
1233                 yaffsfs_SetError(-EBADF);
1234         else if(obj->my_dev->read_only)
1235                 yaffsfs_SetError(-EROFS);
1236         else if( new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
1237                 yaffsfs_SetError(-EINVAL);
1238         else
1239                 /* resize the file */
1240                 result = yaffs_resize_file(obj,new_size);
1241         yaffsfs_Unlock();
1242
1243         return (result) ? 0 : -1;
1244
1245 }
1246
1247 off_t yaffs_lseek(int fd, off_t offset, int whence)
1248 {
1249         yaffsfs_Handle *h = NULL;
1250         struct yaffs_obj *obj = NULL;
1251         int pos = -1;
1252         int fSize = -1;
1253
1254         yaffsfs_Lock();
1255         h = yaffsfs_GetHandlePointer(fd);
1256         obj = yaffsfs_GetHandleObject(fd);
1257
1258         if(!h || !obj)
1259                 yaffsfs_SetError(-EBADF);
1260         else if(offset > YAFFS_MAX_FILE_SIZE)
1261                 yaffsfs_SetError(-EINVAL);
1262         else {
1263                 if(whence == SEEK_SET){
1264                         if(offset >= 0)
1265                                 pos = offset;
1266                 } else if(whence == SEEK_CUR) {
1267                         if( (h->position + offset) >= 0)
1268                                 pos = (h->position + offset);
1269                 } else if(whence == SEEK_END) {
1270                         fSize = yaffs_get_obj_length(obj);
1271                         if(fSize >= 0 && (fSize + offset) >= 0)
1272                                 pos = fSize + offset;
1273                 }
1274
1275                 if(pos >= 0 && pos <= YAFFS_MAX_FILE_SIZE)
1276                         h->position = pos;
1277                 else{
1278                         yaffsfs_SetError(-EINVAL);
1279                         pos = -1;
1280                 }
1281         }
1282
1283         yaffsfs_Unlock();
1284
1285         return pos;
1286 }
1287
1288
1289 int yaffsfs_DoUnlink(const YCHAR *path,int isDirectory)
1290 {
1291         struct yaffs_obj *dir = NULL;
1292         struct yaffs_obj *obj = NULL;
1293         YCHAR *name;
1294         int result = YAFFS_FAIL;
1295         int notDir = 0;
1296         int loop = 0;
1297
1298         if(yaffsfs_CheckPath(path) < 0){
1299                 yaffsfs_SetError(-ENAMETOOLONG);
1300                 return -1;
1301         }
1302
1303         yaffsfs_Lock();
1304
1305         obj = yaffsfs_FindObject(NULL,path,0,0,NULL,NULL,NULL);
1306         dir = yaffsfs_FindDirectory(NULL,path,&name,0,&notDir,&loop);
1307
1308         if(!dir && notDir)
1309                 yaffsfs_SetError(-ENOTDIR);
1310         else if(loop)
1311                 yaffsfs_SetError(-ELOOP);
1312         else if(!dir)
1313                 yaffsfs_SetError(-ENOENT);
1314         else if(yaffs_strncmp(name,_Y("."),2) == 0)
1315                 yaffsfs_SetError(-EINVAL);
1316         else if(!obj)
1317                 yaffsfs_SetError(-ENOENT);
1318         else if(obj->my_dev->read_only)
1319                 yaffsfs_SetError(-EINVAL);
1320         else if(!isDirectory && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
1321                 yaffsfs_SetError(-EISDIR);
1322         else if(isDirectory && obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1323                 yaffsfs_SetError(-ENOTDIR);
1324         else if(isDirectory && obj == obj->my_dev->root_dir)
1325                 yaffsfs_SetError(-EBUSY); /* Can't rmdir a root */
1326         else {
1327                 result = yaffs_unlinker(dir,name);
1328
1329                 if(result == YAFFS_FAIL && isDirectory)
1330                         yaffsfs_SetError(-ENOTEMPTY);
1331         }
1332
1333         yaffsfs_Unlock();
1334
1335         return (result == YAFFS_FAIL) ? -1 : 0;
1336 }
1337
1338
1339 int yaffs_unlink(const YCHAR *path)
1340 {
1341         return yaffsfs_DoUnlink(path,0);
1342 }
1343
1344 int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
1345 {
1346         struct yaffs_obj *olddir = NULL;
1347         struct yaffs_obj *newdir = NULL;
1348         struct yaffs_obj *obj = NULL;
1349         struct yaffs_obj *newobj = NULL;
1350         YCHAR *oldname;
1351         YCHAR *newname;
1352         int result= YAFFS_FAIL;
1353         int rename_allowed = 1;
1354         int notOldDir = 0;
1355         int notNewDir = 0;
1356         int oldLoop = 0;
1357         int newLoop = 0;
1358
1359         YCHAR *alt_newpath=NULL;
1360
1361         if(yaffsfs_CheckPath(newPath) < 0){
1362                 yaffsfs_SetError(-ENAMETOOLONG);
1363                 return -1;
1364         }
1365
1366         if(yaffsfs_alt_dir_path(newPath, &alt_newpath) < 0){
1367                 yaffsfs_SetError(-ENOMEM);
1368                 return -1;
1369         }
1370         if(alt_newpath)
1371                 newPath = alt_newpath;
1372
1373         yaffsfs_Lock();
1374
1375
1376         olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0,&notOldDir,&oldLoop);
1377         newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0,&notNewDir,&newLoop);
1378         obj = yaffsfs_FindObject(NULL,oldPath,0,0,NULL,NULL,NULL);
1379         newobj = yaffsfs_FindObject(NULL,newPath,0,0,NULL,NULL,NULL);
1380
1381         /* If the object being renamed is a directory and the
1382          * path ended with a "/" then the olddir == obj.
1383          * We pass through NULL for the old name to tell the lower layers
1384          * to use olddir as the object.
1385          */
1386
1387         if(olddir == obj)
1388                 oldname = NULL;
1389
1390         if((!olddir && notOldDir) || (!newdir && notNewDir)) {
1391                 yaffsfs_SetError(-ENOTDIR);
1392                 rename_allowed = 0;
1393         } else if(oldLoop || newLoop) {
1394                 yaffsfs_SetError(-ELOOP);
1395                 rename_allowed = 0;
1396         } else if (olddir && oldname && yaffs_strncmp(oldname, _Y("."),2) == 0){
1397                 yaffsfs_SetError(-EINVAL);
1398                 rename_allowed = 0;
1399         }else if(!olddir || !newdir || !obj) {
1400                 yaffsfs_SetError(-ENOENT);
1401                 rename_allowed = 0;
1402         } else if(obj->my_dev->read_only){
1403                 yaffsfs_SetError(-EROFS);
1404                 rename_allowed = 0;
1405         } else if(yaffs_is_non_empty_dir(newobj)){
1406                 yaffsfs_SetError(-ENOTEMPTY);
1407                 rename_allowed = 0;
1408         } else if(olddir->my_dev != newdir->my_dev) {
1409                 /* Rename must be on same device */
1410                 yaffsfs_SetError(-EXDEV);
1411                 rename_allowed = 0;
1412         } else if(obj && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
1413                 /*
1414                  * It is a directory, check that it is not being renamed to
1415                  * being its own decendent.
1416                  * Do this by tracing from the new directory back to the root,
1417                  * checking for obj
1418                  */
1419
1420                 struct yaffs_obj *xx = newdir;
1421
1422                 while( rename_allowed && xx){
1423                         if(xx == obj)
1424                                 rename_allowed = 0;
1425                         xx = xx->parent;
1426                 }
1427                 if(!rename_allowed)
1428                         yaffsfs_SetError(-EINVAL);
1429         }
1430
1431         if(rename_allowed)
1432                 result = yaffs_rename_obj(olddir,oldname,newdir,newname);
1433
1434         yaffsfs_Unlock();
1435
1436         if(alt_newpath)
1437                 YFREE(alt_newpath);
1438
1439         return (result == YAFFS_FAIL) ? -1 : 0;
1440 }
1441
1442
1443 static int yaffsfs_DoStat(struct yaffs_obj *obj,struct yaffs_stat *buf)
1444 {
1445         int retVal = -1;
1446
1447         obj = yaffs_get_equivalent_obj(obj);
1448
1449         if(obj && buf){
1450                 buf->st_dev = (int)obj->my_dev->os_context;
1451                 buf->st_ino = obj->obj_id;
1452                 buf->st_mode = obj->yst_mode & ~S_IFMT; /* clear out file type bits */
1453
1454                 if(obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
1455                         buf->st_mode |= S_IFDIR;
1456                 else if(obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
1457                         buf->st_mode |= S_IFLNK;
1458                 else if(obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
1459                         buf->st_mode |= S_IFREG;
1460
1461                 buf->st_nlink = yaffs_get_obj_link_count(obj);
1462                 buf->st_uid = 0;
1463                 buf->st_gid = 0;;
1464                 buf->st_rdev = obj->yst_rdev;
1465                 buf->st_size = yaffs_get_obj_length(obj);
1466                 buf->st_blksize = obj->my_dev->data_bytes_per_chunk;
1467                 buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
1468 #if CONFIG_YAFFS_WINCE
1469                 buf->yst_wince_atime[0] = obj->win_atime[0];
1470                 buf->yst_wince_atime[1] = obj->win_atime[1];
1471                 buf->yst_wince_ctime[0] = obj->win_ctime[0];
1472                 buf->yst_wince_ctime[1] = obj->win_ctime[1];
1473                 buf->yst_wince_mtime[0] = obj->win_mtime[0];
1474                 buf->yst_wince_mtime[1] = obj->win_mtime[1];
1475 #else
1476                 buf->yst_atime = obj->yst_atime;
1477                 buf->yst_ctime = obj->yst_ctime;
1478                 buf->yst_mtime = obj->yst_mtime;
1479 #endif
1480                 retVal = 0;
1481         }
1482         return retVal;
1483 }
1484
1485 static int yaffsfs_DoStatOrLStat(const YCHAR *path, struct yaffs_stat *buf,int doLStat)
1486 {
1487         struct yaffs_obj *obj=NULL;
1488         struct yaffs_obj *dir=NULL;
1489         int retVal = -1;
1490         int notDir = 0;
1491         int loop = 0;
1492
1493         if(yaffsfs_CheckPath(path) < 0){
1494                 yaffsfs_SetError(-ENAMETOOLONG);
1495                 return -1;
1496         }
1497
1498         yaffsfs_Lock();
1499
1500         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1501
1502         if(!doLStat && obj)
1503                 obj = yaffsfs_FollowLink(obj,0,&loop);
1504
1505         if(!dir && notDir)
1506                 yaffsfs_SetError(-ENOTDIR);
1507         else if(loop)
1508                 yaffsfs_SetError(-ELOOP);
1509         else if(!dir || !obj)
1510                 yaffsfs_SetError(-ENOENT);
1511         else
1512                 retVal = yaffsfs_DoStat(obj,buf);
1513
1514         yaffsfs_Unlock();
1515
1516         return retVal;
1517
1518 }
1519
1520 int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
1521 {
1522         return yaffsfs_DoStatOrLStat(path,buf,0);
1523 }
1524
1525 int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
1526 {
1527         return yaffsfs_DoStatOrLStat(path,buf,1);
1528 }
1529
1530 int yaffs_fstat(int fd, struct yaffs_stat *buf)
1531 {
1532         struct yaffs_obj *obj;
1533
1534         int retVal = -1;
1535
1536         yaffsfs_Lock();
1537         obj = yaffsfs_GetHandleObject(fd);
1538
1539         if(obj)
1540                 retVal = yaffsfs_DoStat(obj,buf);
1541         else
1542                 /* bad handle */
1543                 yaffsfs_SetError(-EBADF);
1544
1545         yaffsfs_Unlock();
1546
1547         return retVal;
1548 }
1549
1550 #ifndef CONFIG_YAFFS_WINCE
1551 /* xattrib functions */
1552
1553
1554 static int yaffs_do_setxattr(const YCHAR *path, const char *name, const void *data, int size, int flags, int follow)
1555 {
1556         struct yaffs_obj *obj;
1557         struct yaffs_obj *dir;
1558         int notDir = 0;
1559         int loop = 0;
1560
1561         int retVal = -1;
1562
1563         if(yaffsfs_CheckPath(path) < 0){
1564                 yaffsfs_SetError(-ENAMETOOLONG);
1565                 return -1;
1566         }
1567
1568         yaffsfs_Lock();
1569
1570         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1571
1572         if(follow)
1573                 obj = yaffsfs_FollowLink(obj,0,&loop);
1574
1575         if(!dir && notDir)
1576                 yaffsfs_SetError(-ENOTDIR);
1577         else if(loop)
1578                 yaffsfs_SetError(-ELOOP);
1579         else if(!dir || !obj)
1580                 yaffsfs_SetError(-ENOENT);
1581         else {
1582                 retVal = yaffs_set_xattrib(obj,name,data,size,flags);
1583                 if(retVal< 0){
1584                         yaffsfs_SetError(retVal);
1585                         retVal = -1;
1586                 }
1587         }
1588
1589         yaffsfs_Unlock();
1590
1591         return retVal;
1592
1593 }
1594
1595 int yaffs_setxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1596 {
1597         return yaffs_do_setxattr(path, name, data, size, flags, 1);
1598 }
1599
1600 int yaffs_lsetxattr(const YCHAR *path, const char *name, const void *data, int size, int flags)
1601 {
1602         return yaffs_do_setxattr(path, name, data, size, flags, 0);
1603 }
1604
1605
1606
1607 int yaffs_fsetxattr(int fd, const char *name, const void *data, int size, int flags)
1608 {
1609         struct yaffs_obj *obj;
1610
1611         int retVal = -1;
1612
1613         yaffsfs_Lock();
1614         obj = yaffsfs_GetHandleObject(fd);
1615
1616         if(!obj)
1617                 yaffsfs_SetError(-EBADF);
1618         else {
1619                 retVal = yaffs_set_xattrib(obj,name,data,size,flags);
1620                 if(retVal< 0){
1621                         yaffsfs_SetError(retVal);
1622                         retVal = -1;
1623                 }
1624         }
1625
1626         yaffsfs_Unlock();
1627
1628         return retVal;
1629 }
1630
1631 static int yaffs_do_getxattr(const YCHAR *path, const char *name, void *data, int size, int follow)
1632 {
1633         struct yaffs_obj *obj;
1634         struct yaffs_obj *dir;
1635         int retVal = -1;
1636         int notDir = 0;
1637         int loop = 0;
1638
1639         if(yaffsfs_CheckPath(path) < 0){
1640                 yaffsfs_SetError(-ENAMETOOLONG);
1641                 return -1;
1642         }
1643
1644         yaffsfs_Lock();
1645
1646         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1647
1648         if(follow)
1649                 obj = yaffsfs_FollowLink(obj,0,&loop);
1650
1651         if(!dir && notDir)
1652                 yaffsfs_SetError(-ENOTDIR);
1653         else if(loop)
1654                 yaffsfs_SetError(-ELOOP);
1655         else if(!dir || !obj)
1656                 yaffsfs_SetError(-ENOENT);
1657         else {
1658                 retVal = yaffs_get_xattrib(obj,name,data,size);
1659                 if(retVal< 0){
1660                         yaffsfs_SetError(retVal);
1661                         retVal = -1;
1662                 }
1663         }
1664         yaffsfs_Unlock();
1665
1666         return retVal;
1667
1668 }
1669
1670 int yaffs_getxattr(const YCHAR *path, const char *name, void *data, int size)
1671 {
1672         return yaffs_do_getxattr( path, name, data, size, 1);
1673 }
1674 int yaffs_lgetxattr(const YCHAR *path, const char *name, void *data, int size)
1675 {
1676         return yaffs_do_getxattr( path, name, data, size, 0);
1677 }
1678
1679
1680
1681 int yaffs_fgetxattr(int fd, const char *name, void *data, int size)
1682 {
1683         struct yaffs_obj *obj;
1684
1685         int retVal = -1;
1686
1687         yaffsfs_Lock();
1688         obj = yaffsfs_GetHandleObject(fd);
1689
1690         if(obj) {
1691                 retVal = yaffs_get_xattrib(obj,name,data,size);
1692                 if(retVal< 0){
1693                         yaffsfs_SetError(retVal);
1694                         retVal = -1;
1695                 }
1696         } else
1697                 /* bad handle */
1698                 yaffsfs_SetError(-EBADF);
1699
1700         yaffsfs_Unlock();
1701
1702         return retVal;
1703 }
1704
1705 static int yaffs_do_listxattr(const YCHAR *path, char *data, int size, int follow)
1706 {
1707         struct yaffs_obj *obj=NULL;
1708         struct yaffs_obj *dir=NULL;
1709         int retVal = -1;
1710         int notDir = 0;
1711         int loop = 0;
1712
1713         if(yaffsfs_CheckPath(path) < 0){
1714                 yaffsfs_SetError(-ENAMETOOLONG);
1715                 return -1;
1716         }
1717
1718         yaffsfs_Lock();
1719
1720         obj = yaffsfs_FindObject(NULL,path,0,1,&dir,&notDir,&loop);
1721
1722         if(follow)
1723                 obj = yaffsfs_FollowLink(obj,0,&loop);
1724
1725         if(!dir && notDir)
1726                 yaffsfs_SetError(-ENOTDIR);
1727         else if(loop)
1728                 yaffsfs_SetError(-ELOOP);
1729         else if(!dir || !obj)
1730                 yaffsfs_SetError(-ENOENT);
1731         else {
1732                 retVal = yaffs_list_xattrib(obj, data,size);
1733                 if(retVal< 0){
1734                         yaffsfs_SetError(retVal);
1735                         retVal = -1;
1736                 }
1737         }
1738
1739         yaffsfs_Unlock();
1740
1741         return retVal;
1742
1743 }
1744
1745 int yaffs_listxattr(const YCHAR *path, char *data, int size)
1746 {
1747         return yaffs_do_listxattr(path, data, size, 1);
1748 }
1749
1750 int yaffs_llistxattr(const YCHAR *path, char *data, int size)
1751 {
1752         return yaffs_do_listxattr(path, data, size, 0);
1753 }
1754
1755 int yaffs_flistxattr(int fd, char *data, int size)
1756 {
1757         struct yaffs_obj *obj;
1758
1759         int retVal = -1;
1760
1761         yaffsfs_Lock();
1762         obj = yaffsfs_GetHandleObject(fd);
1763
1764         if(obj) {
1765                 retVal = yaffs_list_xattrib(obj,data,size);
1766                 if(retVal< 0){
1767                         yaffsfs_SetError(retVal);
1768                         retVal = -1;
1769                 }
1770         } else
1771                 /* bad handle */
1772                 yaffsfs_SetError(-EBADF);
1773
1774         yaffsfs_Unlock();
1775
1776         return retVal;
1777 }
1778
1779 static int yaffs_do_removexattr(const YCHAR *path, const char *name, int follow)
1780 {
1781         struct yaffs_obj *obj=NULL;
1782         struct yaffs_obj *dir=NULL;
1783         int notDir = 0;
1784         int loop = 0;
1785         int retVal = -1;
1786
1787         if(yaffsfs_CheckPath(path) < 0){
1788                 yaffsfs_SetError(-ENAMETOOLONG);
1789                 return -1;
1790         }
1791
1792         yaffsfs_Lock();
1793
1794         obj = yaffsfs_FindObject(NULL,path,0,1, &dir,&notDir,&loop);
1795
1796         if(follow)
1797                 obj = yaffsfs_FollowLink(obj,0,&loop);
1798
1799         if(!dir && notDir)
1800                 yaffsfs_SetError(-ENOTDIR);
1801         else if(loop)
1802                 yaffsfs_SetError(-ELOOP);
1803         else if(!dir || !obj)
1804                 yaffsfs_SetError(-ENOENT);
1805         else {
1806                 retVal = yaffs_remove_xattrib(obj,name);
1807                 if(retVal< 0){
1808                         yaffsfs_SetError(retVal);
1809                         retVal = -1;
1810                 }
1811         }
1812
1813         yaffsfs_Unlock();
1814
1815         return retVal;
1816
1817 }
1818
1819 int yaffs_removexattr(const YCHAR *path, const char *name)
1820 {
1821         return yaffs_do_removexattr(path, name, 1);
1822 }
1823
1824 int yaffs_lremovexattr(const YCHAR *path, const char *name)
1825 {
1826         return yaffs_do_removexattr(path, name, 0);
1827 }
1828
1829 int yaffs_fremovexattr(int fd, const char *name)
1830 {
1831         struct yaffs_obj *obj;
1832
1833         int retVal = -1;
1834
1835         yaffsfs_Lock();
1836         obj = yaffsfs_GetHandleObject(fd);
1837
1838         if(obj){
1839                 retVal = yaffs_remove_xattrib(obj,name);
1840                 if(retVal< 0){
1841                         yaffsfs_SetError(retVal);
1842                         retVal = -1;
1843                 }
1844         }else
1845                 /* bad handle */
1846                 yaffsfs_SetError(-EBADF);
1847
1848         yaffsfs_Unlock();
1849
1850         return retVal;
1851 }
1852 #endif
1853
1854 #ifdef CONFIG_YAFFS_WINCE
1855 int yaffs_get_wince_times(int fd, unsigned *wctime, unsigned *watime, unsigned *wmtime)
1856 {
1857         struct yaffs_obj *obj;
1858
1859         int retVal = -1;
1860
1861         yaffsfs_Lock();
1862         obj = yaffsfs_GetHandleObject(fd);
1863
1864         if(obj){
1865
1866                 if(wctime){
1867                         wctime[0] = obj->win_ctime[0];
1868                         wctime[1] = obj->win_ctime[1];
1869                 }
1870                 if(watime){
1871                         watime[0] = obj->win_atime[0];
1872                         watime[1] = obj->win_atime[1];
1873                 }
1874                 if(wmtime){
1875                         wmtime[0] = obj->win_mtime[0];
1876                         wmtime[1] = obj->win_mtime[1];
1877                 }
1878
1879
1880                 retVal = 0;
1881         } else
1882                 /*  bad handle */
1883                 yaffsfs_SetError(-EBADF);
1884
1885         yaffsfs_Unlock();
1886
1887         return retVal;
1888 }
1889
1890
1891 int yaffs_set_wince_times(int fd,
1892                                                   const unsigned *wctime,
1893                                                   const unsigned *watime,
1894                                                   const unsigned *wmtime)
1895 {
1896         struct yaffs_obj *obj;
1897         int result;
1898         int retVal = -1;
1899
1900         yaffsfs_Lock();
1901         obj = yaffsfs_GetHandleObject(fd);
1902
1903         if(obj){
1904
1905                 if(wctime){
1906                         obj->win_ctime[0] = wctime[0];
1907                         obj->win_ctime[1] = wctime[1];
1908                 }
1909                 if(watime){
1910                         obj->win_atime[0] = watime[0];
1911                         obj->win_atime[1] = watime[1];
1912                 }
1913                 if(wmtime){
1914                         obj->win_mtime[0] = wmtime[0];
1915                         obj->win_mtime[1] = wmtime[1];
1916                 }
1917
1918                 obj->dirty = 1;
1919                 result = yaffs_flush_file(obj,0,0);
1920                 retVal = 0;
1921         } else
1922                 /* bad handle */
1923                 yaffsfs_SetError(-EBADF);
1924
1925         yaffsfs_Unlock();
1926
1927         return retVal;
1928 }
1929
1930 #endif
1931
1932
1933 static int yaffsfs_DoChMod(struct yaffs_obj *obj,mode_t mode)
1934 {
1935         int result = -1;
1936
1937         if(obj)
1938                 obj = yaffs_get_equivalent_obj(obj);
1939
1940         if(obj) {
1941                 obj->yst_mode = mode;
1942                 obj->dirty = 1;
1943                 result = yaffs_flush_file(obj,0,0);
1944         }
1945
1946         return result == YAFFS_OK ? 0 : -1;
1947 }
1948
1949
1950 int yaffs_access(const YCHAR *path, int amode)
1951 {
1952         struct yaffs_obj *obj=NULL;
1953         struct yaffs_obj *dir=NULL;
1954         int notDir = 0;
1955         int loop = 0;
1956         int retval = -1;
1957
1958         if(yaffsfs_CheckPath(path) < 0){
1959                 yaffsfs_SetError(-ENAMETOOLONG);
1960                 return -1;
1961         }
1962
1963         if(amode & ~(R_OK | W_OK | X_OK)){
1964                 yaffsfs_SetError(-EINVAL);
1965                 return -1;
1966         }
1967
1968         yaffsfs_Lock();
1969
1970         obj = yaffsfs_FindObject(NULL,path,0,1, &dir,&notDir,&loop);
1971         obj = yaffsfs_FollowLink(obj,0,&loop);
1972
1973         if(!dir && notDir)
1974                 yaffsfs_SetError(-ENOTDIR);
1975         else if(loop)
1976                 yaffsfs_SetError(-ELOOP);
1977         else if(!dir || !obj)
1978                 yaffsfs_SetError(-ENOENT);
1979         else if((amode & W_OK) && obj->my_dev->read_only)
1980                 yaffsfs_SetError(-EROFS);
1981         else{
1982                 int access_ok = 1;
1983
1984                 if((amode & R_OK) && !(obj->yst_mode & S_IREAD))
1985                         access_ok = 0;
1986                 if((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
1987                         access_ok = 0;
1988                 if((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
1989                         access_ok = 0;
1990
1991                 if(!access_ok)
1992                         yaffsfs_SetError(-EACCES);
1993                 else
1994                         retval = 0;
1995         }
1996
1997         yaffsfs_Unlock();
1998
1999         return retval;
2000
2001 }
2002
2003
2004 int yaffs_chmod(const YCHAR *path, mode_t mode)
2005 {
2006         struct yaffs_obj *obj=NULL;
2007         struct yaffs_obj *dir=NULL;
2008         int retVal = -1;
2009         int notDir = 0;
2010         int loop = 0;
2011
2012         if(yaffsfs_CheckPath(path) < 0){
2013                 yaffsfs_SetError(-ENAMETOOLONG);
2014                 return -1;
2015         }
2016
2017         if(mode & ~(0777)){
2018                 yaffsfs_SetError(-EINVAL);
2019                 return -1;
2020         }
2021
2022         yaffsfs_Lock();
2023
2024         obj = yaffsfs_FindObject(NULL,path,0,1, &dir, &notDir,&loop);
2025         obj = yaffsfs_FollowLink(obj,0,&loop);
2026
2027         if(!dir && notDir)
2028                 yaffsfs_SetError(-ENOTDIR);
2029         else if(loop)
2030                 yaffsfs_SetError(-ELOOP);
2031         else if(!dir || !obj)
2032                 yaffsfs_SetError(-ENOENT);
2033         else if(obj->my_dev->read_only)
2034                 yaffsfs_SetError(-EROFS);
2035         else
2036                 retVal = yaffsfs_DoChMod(obj,mode);
2037
2038         yaffsfs_Unlock();
2039
2040         return retVal;
2041
2042 }
2043
2044
2045 int yaffs_fchmod(int fd, mode_t mode)
2046 {
2047         struct yaffs_obj *obj;
2048         int retVal = -1;
2049
2050         if(mode & ~(0777)){
2051                 yaffsfs_SetError(-EINVAL);
2052                 return -1;
2053         }
2054
2055         yaffsfs_Lock();
2056         obj = yaffsfs_GetHandleObject(fd);
2057
2058         if(!obj)
2059                 yaffsfs_SetError(-EBADF);
2060         else if(obj->my_dev->read_only)
2061                 yaffsfs_SetError(-EROFS);
2062         else
2063                 retVal = yaffsfs_DoChMod(obj,mode);
2064
2065         yaffsfs_Unlock();
2066
2067         return retVal;
2068 }
2069
2070 int yaffs_mkdir(const YCHAR *path, mode_t mode)
2071 {
2072         struct yaffs_obj *parent = NULL;
2073         struct yaffs_obj *dir = NULL;
2074         YCHAR *name;
2075         YCHAR *alt_path = NULL;
2076         int retVal= -1;
2077         int notDir = 0;
2078         int loop = 0;
2079
2080         if(yaffsfs_CheckPath(path) < 0){
2081                 yaffsfs_SetError(-ENAMETOOLONG);
2082                 return -1;
2083         }
2084
2085         if(yaffsfs_alt_dir_path(path, &alt_path) < 0){
2086                 yaffsfs_SetError(-ENOMEM);
2087                 return -1;
2088         }
2089         if(alt_path)
2090                 path = alt_path;
2091
2092         yaffsfs_Lock();
2093         parent = yaffsfs_FindDirectory(NULL,path,&name,0,&notDir,&loop);
2094         if(!parent && notDir)
2095                 yaffsfs_SetError(-ENOTDIR);
2096         else if(loop)
2097                 yaffsfs_SetError(-ELOOP);
2098         else if(!parent)
2099                 yaffsfs_SetError(-ENOENT);
2100         else if(yaffs_strnlen(name,5) == 0){
2101                 /* Trying to make the root itself */
2102                 yaffsfs_SetError(-EEXIST);
2103         } else if(parent->my_dev->read_only)
2104                 yaffsfs_SetError(-EROFS);
2105         else {
2106                 dir = yaffs_create_dir(parent,name,mode,0,0);
2107                 if(dir)
2108                         retVal = 0;
2109                 else if (yaffs_find_by_name(parent,name))
2110                         yaffsfs_SetError(-EEXIST); /* the name already exists */
2111                 else
2112                         yaffsfs_SetError(-ENOSPC); /* just assume no space */
2113         }
2114
2115         yaffsfs_Unlock();
2116
2117         if(alt_path)
2118                 YFREE(alt_path);
2119
2120         return retVal;
2121 }
2122
2123 int yaffs_rmdir(const YCHAR *path)
2124 {
2125         int result;
2126         YCHAR *alt_path;
2127
2128         if(yaffsfs_CheckPath(path) < 0){
2129                 yaffsfs_SetError(-ENAMETOOLONG);
2130                 return -1;
2131         }
2132
2133         if(yaffsfs_alt_dir_path(path, &alt_path) < 0){
2134                 yaffsfs_SetError(-ENOMEM);
2135                 return -1;
2136         }
2137         if(alt_path)
2138                 path = alt_path;
2139         result =  yaffsfs_DoUnlink(path,1);
2140         if(alt_path)
2141                 YFREE(alt_path);
2142         return result;
2143 }
2144
2145
2146 void * yaffs_getdev(const YCHAR *path)
2147 {
2148         struct yaffs_dev *dev=NULL;
2149         YCHAR *dummy;
2150         dev = yaffsfs_FindDevice(path,&dummy);
2151         return (void *)dev;
2152 }
2153
2154 int yaffs_mount2(const YCHAR *path,int read_only)
2155 {
2156         int retVal=-1;
2157         int result=YAFFS_FAIL;
2158         struct yaffs_dev *dev=NULL;
2159
2160         T(YAFFS_TRACE_MOUNT,(TSTR("yaffs: Mounting %s" TENDSTR),path));
2161
2162         if(yaffsfs_CheckPath(path) < 0){
2163                 yaffsfs_SetError(-ENAMETOOLONG);
2164                 return -1;
2165         }
2166
2167         yaffsfs_Lock();
2168
2169         yaffsfs_InitHandles();
2170
2171         dev = yaffsfs_FindMountPoint(path);
2172         if(dev){
2173                 if(!dev->is_mounted){
2174                         dev->read_only = read_only ? 1 : 0;
2175                         result = yaffs_guts_initialise(dev);
2176                         if(result == YAFFS_FAIL)
2177                                 yaffsfs_SetError(-ENOMEM);
2178                         retVal = result ? 0 : -1;
2179
2180                 }
2181                 else
2182                         yaffsfs_SetError(-EBUSY);
2183         } else
2184                 yaffsfs_SetError(-ENODEV);
2185
2186         yaffsfs_Unlock();
2187         return retVal;
2188
2189 }
2190
2191 int yaffs_mount(const YCHAR *path)
2192 {
2193         return yaffs_mount2(path,0);
2194 }
2195
2196 int yaffs_sync(const YCHAR *path)
2197 {
2198         int retVal=-1;
2199         struct yaffs_dev *dev=NULL;
2200         YCHAR *dummy;
2201
2202         if(yaffsfs_CheckPath(path) < 0){
2203                 yaffsfs_SetError(-ENAMETOOLONG);
2204                 return -1;
2205         }
2206
2207         yaffsfs_Lock();
2208         dev = yaffsfs_FindDevice(path,&dummy);
2209         if(dev){
2210                 if(!dev->is_mounted)
2211                         yaffsfs_SetError(-EINVAL);
2212                 else if(dev->read_only)
2213                         yaffsfs_SetError(-EROFS);
2214                 else {
2215
2216                         yaffs_flush_whole_cache(dev);
2217                         yaffs_checkpoint_save(dev);
2218                         retVal = 0;
2219
2220                 }
2221         }else
2222                 yaffsfs_SetError(-ENODEV);
2223
2224         yaffsfs_Unlock();
2225         return retVal;
2226 }
2227
2228
2229 int yaffs_remount(const YCHAR *path, int force, int read_only)
2230 {
2231         int retVal=-1;
2232         struct yaffs_dev *dev=NULL;
2233         yaffsfs_Handle *yh;
2234
2235         if(yaffsfs_CheckPath(path) < 0){
2236                 yaffsfs_SetError(-ENAMETOOLONG);
2237                 return -1;
2238         }
2239
2240         yaffsfs_Lock();
2241         dev = yaffsfs_FindMountPoint(path);
2242         if(dev){
2243                 if(dev->is_mounted){
2244                         int i;
2245                         int inUse;
2246
2247                         yaffs_flush_whole_cache(dev);
2248
2249                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse && !force; i++){
2250                                 yh = & yaffsfs_handle[i];
2251                                 if(yh->useCount>0 &&
2252                                         yaffsfs_inode[yh->inodeId].iObj->my_dev == dev)
2253                                         inUse = 1; /* the device is in use, can't unmount */
2254                         }
2255
2256                         if(!inUse || force){
2257                                 if(read_only)
2258                                         yaffs_checkpoint_save(dev);
2259                                 dev->read_only =  read_only ? 1 : 0;
2260                                 retVal = 0;
2261                         } else
2262                                 yaffsfs_SetError(-EBUSY);
2263
2264                 } else
2265                         yaffsfs_SetError(-EINVAL);
2266
2267         }
2268         else
2269                 yaffsfs_SetError(-ENODEV);
2270
2271         yaffsfs_Unlock();
2272         return retVal;
2273
2274 }
2275
2276 int yaffs_unmount2(const YCHAR *path, int force)
2277 {
2278         int retVal=-1;
2279         struct yaffs_dev *dev=NULL;
2280
2281         if(yaffsfs_CheckPath(path) < 0){
2282                 yaffsfs_SetError(-ENAMETOOLONG);
2283                 return -1;
2284         }
2285
2286         yaffsfs_Lock();
2287         dev = yaffsfs_FindMountPoint(path);
2288         if(dev){
2289                 if(dev->is_mounted){
2290                         int i;
2291                         int inUse;
2292
2293                         yaffs_flush_whole_cache(dev);
2294                         yaffs_checkpoint_save(dev);
2295
2296                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++){
2297                                 if(yaffsfs_handle[i].useCount > 0 &&
2298                                 yaffsfs_inode[yaffsfs_handle[i].inodeId].iObj->my_dev == dev)
2299                                         inUse = 1; /* the device is in use, can't unmount */
2300                         }
2301
2302                         if(!inUse || force){
2303                                 if(inUse)
2304                                         yaffsfs_BreakDeviceHandles(dev);
2305                                 yaffs_deinitialise(dev);
2306
2307                                 retVal = 0;
2308                         } else
2309                                 yaffsfs_SetError(-EBUSY);
2310
2311                 } else
2312                         yaffsfs_SetError(-EINVAL);
2313
2314         } else
2315                 yaffsfs_SetError(-ENODEV);
2316
2317         yaffsfs_Unlock();
2318         return retVal;
2319
2320 }
2321
2322 int yaffs_unmount(const YCHAR *path)
2323 {
2324         return yaffs_unmount2(path,0);
2325 }
2326
2327 loff_t yaffs_freespace(const YCHAR *path)
2328 {
2329         loff_t retVal=-1;
2330         struct yaffs_dev *dev=NULL;
2331         YCHAR *dummy;
2332
2333         if(yaffsfs_CheckPath(path) < 0){
2334                 yaffsfs_SetError(-ENAMETOOLONG);
2335                 return -1;
2336         }
2337
2338         yaffsfs_Lock();
2339         dev = yaffsfs_FindDevice(path,&dummy);
2340         if(dev  && dev->is_mounted){
2341                 retVal = yaffs_get_n_free_chunks(dev);
2342                 retVal *= dev->data_bytes_per_chunk;
2343
2344         } else
2345                 yaffsfs_SetError(-EINVAL);
2346
2347         yaffsfs_Unlock();
2348         return retVal;
2349 }
2350
2351 loff_t yaffs_totalspace(const YCHAR *path)
2352 {
2353         loff_t retVal=-1;
2354         struct yaffs_dev *dev=NULL;
2355         YCHAR *dummy;
2356
2357         if(yaffsfs_CheckPath(path) < 0){
2358                 yaffsfs_SetError(-ENAMETOOLONG);
2359                 return -1;
2360         }
2361
2362         yaffsfs_Lock();
2363         dev = yaffsfs_FindDevice(path,&dummy);
2364         if(dev  && dev->is_mounted){
2365                 retVal = (dev->param.end_block - dev->param.start_block + 1) -
2366                         dev->param.n_reserved_blocks;
2367                 retVal *= dev->param.chunks_per_block;
2368                 retVal *= dev->data_bytes_per_chunk;
2369
2370         } else
2371                 yaffsfs_SetError(-EINVAL);
2372
2373         yaffsfs_Unlock();
2374         return retVal;
2375 }
2376
2377 int yaffs_inodecount(const YCHAR *path)
2378 {
2379         loff_t retVal= -1;
2380         struct yaffs_dev *dev=NULL;
2381         YCHAR *dummy;
2382
2383         if(yaffsfs_CheckPath(path) < 0){
2384                 yaffsfs_SetError(-ENAMETOOLONG);
2385                 return -1;
2386         }
2387
2388         yaffsfs_Lock();
2389         dev = yaffsfs_FindDevice(path,&dummy);
2390         if(dev  && dev->is_mounted) {
2391            int n_obj = dev->n_obj;
2392            if(n_obj > dev->n_hardlinks)
2393                 retVal = n_obj - dev->n_hardlinks;
2394         }
2395
2396         if(retVal < 0)
2397                 yaffsfs_SetError(-EINVAL);
2398
2399         yaffsfs_Unlock();
2400         return retVal;
2401 }
2402
2403
2404 void yaffs_add_device(struct yaffs_dev *dev)
2405 {
2406         dev->is_mounted = 0;
2407         dev->param.remove_obj_fn = yaffsfs_RemoveObjectCallback;
2408
2409         if(!dev->dev_list.next)
2410                 INIT_LIST_HEAD(&dev->dev_list);
2411
2412         list_add(&dev->dev_list,&yaffsfs_deviceList);
2413 }
2414
2415 void yaffs_remove_device(struct yaffs_dev *dev)
2416 {
2417         list_del_init(&dev->dev_list);
2418 }
2419
2420
2421
2422
2423 /* Directory search stuff. */
2424
2425 /*
2426  * Directory search context
2427  *
2428  * NB this is an opaque structure.
2429  */
2430
2431
2432 typedef struct
2433 {
2434         u32 magic;
2435         yaffs_dirent de;                /* directory entry being used by this dsc */
2436         YCHAR name[NAME_MAX+1];         /* name of directory being searched */
2437         struct yaffs_obj *dirObj;           /* ptr to directory being searched */
2438         struct yaffs_obj *nextReturn;       /* obj to be returned by next readddir */
2439         int offset;
2440         struct list_head others;
2441 } yaffsfs_DirectorySearchContext;
2442
2443
2444
2445 static struct list_head search_contexts;
2446
2447
2448 static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
2449 {
2450         if(dsc &&
2451            dsc->dirObj &&
2452            dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2453
2454            dsc->offset = 0;
2455
2456            if( list_empty(&dsc->dirObj->variant.dir_variant.children))
2457                 dsc->nextReturn = NULL;
2458            else
2459                 dsc->nextReturn = list_entry(dsc->dirObj->variant.dir_variant.children.next,
2460                                                 struct yaffs_obj,siblings);
2461         } else {
2462                 /* Hey someone isn't playing nice! */
2463         }
2464 }
2465
2466 static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
2467 {
2468         if(dsc &&
2469            dsc->dirObj &&
2470            dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY){
2471
2472            if( dsc->nextReturn == NULL ||
2473                list_empty(&dsc->dirObj->variant.dir_variant.children))
2474                 dsc->nextReturn = NULL;
2475            else {
2476                    struct list_head *next = dsc->nextReturn->siblings.next;
2477
2478                    if( next == &dsc->dirObj->variant.dir_variant.children)
2479                         dsc->nextReturn = NULL; /* end of list */
2480                    else
2481                         dsc->nextReturn = list_entry(next,struct yaffs_obj,siblings);
2482            }
2483         } else {
2484                 /* Hey someone isn't playing nice! */
2485         }
2486 }
2487
2488 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj)
2489 {
2490
2491         struct list_head *i;
2492         yaffsfs_DirectorySearchContext *dsc;
2493
2494         /* if search contexts not initilised then skip */
2495         if(!search_contexts.next)
2496                 return;
2497
2498         /* Iterate through the directory search contexts.
2499          * If any are the one being removed, then advance the dsc to
2500          * the next one to prevent a hanging ptr.
2501          */
2502          list_for_each(i, &search_contexts) {
2503                 if (i) {
2504                         dsc = list_entry(i, yaffsfs_DirectorySearchContext,others);
2505                         if(dsc->nextReturn == obj)
2506                                 yaffsfs_DirAdvance(dsc);
2507                 }
2508         }
2509
2510 }
2511
2512 yaffs_DIR *yaffs_opendir(const YCHAR *dirname)
2513 {
2514         yaffs_DIR *dir = NULL;
2515         struct yaffs_obj *obj = NULL;
2516         yaffsfs_DirectorySearchContext *dsc = NULL;
2517         int notDir = 0;
2518         int loop = 0;
2519
2520         if(yaffsfs_CheckPath(dirname) < 0){
2521                 yaffsfs_SetError(-ENAMETOOLONG);
2522                 return NULL;
2523         }
2524
2525         yaffsfs_Lock();
2526
2527         obj = yaffsfs_FindObject(NULL,dirname,0,1,NULL,&notDir,&loop);
2528
2529         if(!obj && notDir)
2530                 yaffsfs_SetError(-ENOTDIR);
2531         else if(loop)
2532                 yaffsfs_SetError(-ELOOP);
2533         else if(!obj)
2534                 yaffsfs_SetError(-ENOENT);
2535         else if(obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
2536                 yaffsfs_SetError(-ENOTDIR);
2537         else {
2538
2539                 dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
2540                 dir = (yaffs_DIR *)dsc;
2541
2542                 if(dsc){
2543                         memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
2544                         dsc->magic = YAFFS_MAGIC;
2545                         dsc->dirObj = obj;
2546                         yaffs_strncpy(dsc->name,dirname,NAME_MAX);
2547                         INIT_LIST_HEAD(&dsc->others);
2548
2549                         if(!search_contexts.next)
2550                                 INIT_LIST_HEAD(&search_contexts);
2551
2552                         list_add(&dsc->others,&search_contexts);
2553                         yaffsfs_SetDirRewound(dsc);
2554                 }
2555
2556         }
2557
2558         yaffsfs_Unlock();
2559
2560         return dir;
2561 }
2562
2563 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
2564 {
2565         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2566         struct yaffs_dirent *retVal = NULL;
2567
2568         yaffsfs_Lock();
2569
2570         if(dsc && dsc->magic == YAFFS_MAGIC){
2571                 yaffsfs_SetError(0);
2572                 if(dsc->nextReturn){
2573                         dsc->de.d_ino = yaffs_get_equivalent_obj(dsc->nextReturn)->obj_id;
2574                         dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
2575                         dsc->de.d_off = dsc->offset++;
2576                         yaffs_get_obj_name(dsc->nextReturn,dsc->de.d_name,NAME_MAX);
2577                         if(yaffs_strnlen(dsc->de.d_name,NAME_MAX+1) == 0)
2578                         {
2579                                 /* this should not happen! */
2580                                 yaffs_strcpy(dsc->de.d_name,_Y("zz"));
2581                         }
2582                         dsc->de.d_reclen = sizeof(struct yaffs_dirent);
2583                         retVal = &dsc->de;
2584                         yaffsfs_DirAdvance(dsc);
2585                 } else
2586                         retVal = NULL;
2587         } else
2588                 yaffsfs_SetError(-EBADF);
2589
2590         yaffsfs_Unlock();
2591
2592         return retVal;
2593
2594 }
2595
2596
2597 void yaffs_rewinddir(yaffs_DIR *dirp)
2598 {
2599         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2600
2601         yaffsfs_Lock();
2602
2603         yaffsfs_SetDirRewound(dsc);
2604
2605         yaffsfs_Unlock();
2606 }
2607
2608
2609 int yaffs_closedir(yaffs_DIR *dirp)
2610 {
2611         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
2612
2613         yaffsfs_Lock();
2614         dsc->magic = 0;
2615         list_del(&dsc->others); /* unhook from list */
2616         YFREE(dsc);
2617         yaffsfs_Unlock();
2618         return 0;
2619 }
2620
2621 /* End of directory stuff */
2622
2623
2624 int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath)
2625 {
2626         struct yaffs_obj *parent = NULL;
2627         struct yaffs_obj *obj;
2628         YCHAR *name;
2629         int retVal= -1;
2630         int mode = 0; /* ignore for now */
2631         int notDir = 0;
2632         int loop = 0;
2633
2634         if(yaffsfs_CheckPath(newpath) < 0){
2635                 yaffsfs_SetError(-ENAMETOOLONG);
2636                 return -1;
2637         }
2638         yaffsfs_Lock();
2639         parent = yaffsfs_FindDirectory(NULL,newpath,&name,0,&notDir,&loop);
2640         if(!parent && notDir)
2641                 yaffsfs_SetError(-ENOTDIR);
2642         else if(loop)
2643                 yaffsfs_SetError(-ELOOP);
2644         else if( !parent || yaffs_strnlen(name,5) < 1)
2645                 yaffsfs_SetError(-ENOENT);
2646         else if(parent->my_dev->read_only)
2647                 yaffsfs_SetError(-EROFS);
2648         else if(parent){
2649                 obj = yaffs_create_symlink(parent,name,mode,0,0,oldpath);
2650                 if(obj)
2651                         retVal = 0;
2652                 else if (yaffsfs_FindObject(NULL,newpath,0,0, NULL,NULL,NULL))
2653                         yaffsfs_SetError(-EEXIST);
2654                 else
2655                         yaffsfs_SetError(-ENOSPC);
2656         }
2657
2658         yaffsfs_Unlock();
2659
2660         return retVal;
2661
2662 }
2663
2664 int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz)
2665 {
2666         struct yaffs_obj *obj = NULL;
2667         struct yaffs_obj *dir = NULL;
2668         int retVal= -1;
2669         int notDir = 0;
2670         int loop = 0;
2671
2672         yaffsfs_Lock();
2673
2674         obj = yaffsfs_FindObject(NULL,path,0,1, &dir,&notDir,&loop);
2675
2676         if(!dir && notDir)
2677                 yaffsfs_SetError(-ENOTDIR);
2678         else if(loop)
2679                 yaffsfs_SetError(-ELOOP);
2680         else if(!dir || !obj)
2681                 yaffsfs_SetError(-ENOENT);
2682         else if(obj->variant_type != YAFFS_OBJECT_TYPE_SYMLINK)
2683                 yaffsfs_SetError(-EINVAL);
2684         else {
2685                 YCHAR *alias = obj->variant.symlink_variant.alias;
2686                 memset(buf,0,bufsiz);
2687                 yaffs_strncpy(buf,alias,bufsiz - 1);
2688                 retVal = 0;
2689         }
2690         yaffsfs_Unlock();
2691         return retVal;
2692 }
2693
2694 int yaffs_link(const YCHAR *oldpath, const YCHAR *linkpath)
2695 {
2696         /* Creates a link called newpath to existing oldpath */
2697         struct yaffs_obj *obj = NULL;
2698         struct yaffs_obj *lnk = NULL;
2699         struct yaffs_obj *obj_dir = NULL;
2700         struct yaffs_obj *lnk_dir = NULL;
2701         int retVal = -1;
2702         int notDirObj = 0;
2703         int notDirLnk = 0;
2704         int objLoop = 0;
2705         int lnkLoop = 0;
2706         YCHAR *newname;
2707
2708         if(yaffsfs_CheckPath(linkpath) < 0){
2709                 yaffsfs_SetError(-ENAMETOOLONG);
2710                 return -1;
2711         }
2712
2713         yaffsfs_Lock();
2714
2715         obj = yaffsfs_FindObject(NULL,oldpath,0,1,&obj_dir,&notDirObj,&objLoop);
2716         lnk = yaffsfs_FindObject(NULL,linkpath,0,0,NULL,NULL,NULL);
2717         lnk_dir = yaffsfs_FindDirectory(NULL,linkpath,&newname,0,&notDirLnk,&lnkLoop);
2718
2719         if((!obj_dir && notDirObj) || (!lnk_dir && notDirLnk))
2720                 yaffsfs_SetError(-ENOTDIR);
2721         else if(objLoop || lnkLoop)
2722                 yaffsfs_SetError(-ELOOP);
2723         else if(!obj_dir || !lnk_dir || !obj)
2724                 yaffsfs_SetError(-ENOENT);
2725         else if(obj->my_dev->read_only)
2726                 yaffsfs_SetError(-EROFS);
2727         else if(lnk)
2728                 yaffsfs_SetError(-EEXIST);
2729         else if(lnk_dir->my_dev != obj->my_dev)
2730                 yaffsfs_SetError(-EXDEV);
2731         else {
2732                 retVal = yaffsfs_CheckNameLength(newname);
2733
2734                 if(retVal == 0) {
2735                         lnk = yaffs_link_obj(lnk_dir,newname,obj);
2736                         if(lnk)
2737                                 retVal = 0;
2738                         else{
2739                                 yaffsfs_SetError(-ENOSPC);
2740                                 retVal = -1;
2741                         }
2742                 }
2743         }
2744         yaffsfs_Unlock();
2745
2746         return retVal;
2747 }
2748
2749 int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev)
2750 {
2751         pathname=pathname;
2752         mode=mode;
2753         dev=dev;
2754
2755         yaffsfs_SetError(-EINVAL);
2756         return -1;
2757 }
2758
2759
2760 /*
2761  * D E B U G   F U N C T I O N S
2762  */
2763
2764 /*
2765  * yaffs_n_handles()
2766  * Returns number of handles attached to the object
2767  */
2768 int yaffs_n_handles(const YCHAR *path)
2769 {
2770         struct yaffs_obj *obj;
2771
2772         if(yaffsfs_CheckPath(path) < 0){
2773                 yaffsfs_SetError(-ENAMETOOLONG);
2774                 return -1;
2775         }
2776
2777         obj = yaffsfs_FindObject(NULL,path,0,1,NULL,NULL,NULL);
2778
2779         if(obj)
2780                 return yaffsfs_CountHandles(obj);
2781         else
2782                 return -1;
2783 }
2784
2785 int yaffs_get_error(void)
2786 {
2787         return yaffsfs_GetLastError();
2788 }
2789
2790 int yaffs_set_error(int error)
2791 {
2792         yaffsfs_SetError(error);
2793         return 0;
2794 }
2795
2796 int yaffs_dump_dev(const YCHAR *path)
2797 {
2798 #if 1
2799         path=path;
2800 #else
2801         YCHAR *rest;
2802
2803         struct yaffs_obj *obj = yaffsfs_FindRoot(path,&rest);
2804
2805         if(obj){
2806                 struct yaffs_dev *dev = obj->my_dev;
2807
2808                 printf("\n"
2809                            "n_page_writes.......... %d\n"
2810                            "n_page_reads........... %d\n"
2811                            "n_erasures....... %d\n"
2812                            "n_gc_copies............ %d\n"
2813                            "garbageCollections... %d\n"
2814                            "passiveGarbageColl'ns %d\n"
2815                            "\n",
2816                                 dev->n_page_writes,
2817                                 dev->n_page_reads,
2818                                 dev->n_erasures,
2819                                 dev->n_gc_copies,
2820                                 dev->garbageCollections,
2821                                 dev->passiveGarbageCollections
2822                 );
2823
2824         }
2825
2826 #endif
2827         return 0;
2828 }
2829