direct/yaffsfs.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  * yaffsfs.c  The interface functions for using YAFFS via a "direct" interface.
   4  *
   5  * Copyright (C) 2002 Aleph One Ltd.
   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
  15 #include "yaffsfs.h"
  16 #include "yaffs_guts.h"
  17 #include "yaffscfg.h"
  18 #include <string.h> // for memset
  19 #include "yportenv.h"
  20
  21 #define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
  22
  23 #ifndef NULL
  24 #define NULL ((void *)0)
  25 #endif
  26
  27
  28 const char *yaffsfs_c_version="$Id: yaffsfs.c,v 1.5 2003-03-11 05:16:53 charles Exp $";
  29
  30 // configurationList is the list of devices that are supported
  31 static yaffsfs_DeviceConfiguration *yaffsfs_configurationList;
  32
  33
  34 //
  35 // Directory search context
  36 //
  37 // NB this is an opaque structure.
  38
  39 struct yaffsfs_ObjectListEntry
  40 {
  41         int objectId;
  42         struct yaffsfs_ObjectListEntry *next;
  43 };
  44
  45
  46 typedef struct
  47 {
  48         __u32 magic;
  49         yaffs_dirent de;
  50         struct yaffsfs_ObjectListEntry *list;
  51         char name[NAME_MAX+1];
  52
  53 } yaffsfs_DirectorySearchContext;
  54
  55
  56 // Handle management.
  57 //
  58
  59 typedef struct
  60 {
  61         __u8  inUse:1;          // this handle is in use
  62         __u8  readOnly:1;       // this handle is read only
  63         __u8  append:1;         // append only
  64         __u8  exclusive:1;      // exclusive
  65         __u32 position;         // current position in file
  66         yaffs_Object *obj;      // the object
  67 }yaffsfs_Handle;
  68
  69
  70 static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path, int symDepth);
  71
  72
  73
  74 static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
  75
  76 // yaffsfs_InitHandle
  77 /// Inilitalise handles on start-up.
  78 //
  79 static int yaffsfs_InitHandles(void)
  80 {
  81         int i;
  82         for(i = 0; i < YAFFSFS_N_HANDLES; i++)
  83         {
  84                 yaffsfs_handle[i].inUse = 0;
  85                 yaffsfs_handle[i].obj = NULL;
  86         }
  87         return 0;
  88 }
  89
  90 yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
  91 {
  92         if(h < 0 || h >= YAFFSFS_N_HANDLES)
  93         {
  94                 return NULL;
  95         }
  96
  97         return &yaffsfs_handle[h];
  98 }
  99
 100 yaffs_Object *yaffsfs_GetHandleObject(int handle)
 101 {
 102         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 103
 104         if(h && h->inUse)
 105         {
 106                 return h->obj;
 107         }
 108
 109         return NULL;
 110 }
 111
 112
 113 //yaffsfs_GetHandle
 114 // Grab a handle (when opening a file)
 115 //
 116
 117 static int yaffsfs_GetHandle(void)
 118 {
 119         int i;
 120         yaffsfs_Handle *h;
 121
 122         for(i = 0; i < YAFFSFS_N_HANDLES; i++)
 123         {
 124                 h = yaffsfs_GetHandlePointer(i);
 125                 if(!h)
 126                 {
 127                         // todo bug: should never happen
 128                 }
 129                 if(!h->inUse)
 130                 {
 131                         memset(h,0,sizeof(yaffsfs_Handle));
 132                         h->inUse=1;
 133                         return i;
 134                 }
 135         }
 136         return -1;
 137 }
 138
 139 // yaffs_PutHandle
 140 // Let go of a handle (when closing a file)
 141 //
 142 static int yaffsfs_PutHandle(int handle)
 143 {
 144         yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
 145
 146         if(h)
 147         {
 148                 h->inUse = 0;
 149                 h->obj = NULL;
 150         }
 151         return 0;
 152 }
 153
 154
 155
 156 // Stuff to search for a directory from a path
 157
 158
 159 int yaffsfs_Match(char a, char b)
 160 {
 161         // case sensitive
 162         return (a == b);
 163 }
 164
 165 // yaffsfs_FindDevice
 166 // yaffsfs_FindRoot
 167 // Scan the configuration list to find the root.
 168 static yaffs_Device *yaffsfs_FindDevice(const char *path, char **restOfPath)
 169 {
 170         yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList;
 171         const char *leftOver;
 172         const char *p;
 173
 174         while(cfg && cfg->prefix && cfg->dev)
 175         {
 176                 leftOver = path;
 177                 p = cfg->prefix;
 178                 while(*p && *leftOver && yaffsfs_Match(*p,*leftOver))
 179                 {
 180                         p++;
 181                         leftOver++;
 182                 }
 183                 if(!*p)
 184                 {
 185                         // Matched prefix
 186                         *restOfPath = (char *)leftOver;
 187                         return cfg->dev;
 188                 }
 189                 cfg++;
 190         }
 191         return NULL;
 192 }
 193
 194 static yaffs_Object *yaffsfs_FindRoot(const char *path, char **restOfPath)
 195 {
 196
 197         yaffs_Device *dev;
 198
 199         dev= yaffsfs_FindDevice(path,restOfPath);
 200         if(dev && dev->isMounted)
 201         {
 202                 return dev->rootDir;
 203         }
 204         return NULL;
 205 }
 206
 207 static yaffs_Object *yaffsfs_FollowLink(yaffs_Object *obj,int symDepth)
 208 {
 209
 210         while(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
 211         {
 212                 char *alias = obj->variant.symLinkVariant.alias;
 213
 214                 if(*alias == '/')
 215                 {
 216                         // Starts with a /, need to scan from root up
 217                         obj = yaffsfs_FindObject(NULL,alias,symDepth++);
 218                 }
 219                 else
 220                 {
 221                         // Relative to here, so use the parent of the symlink as a start
 222                         obj = yaffsfs_FindObject(obj->parent,alias,symDepth++);
 223                 }
 224         }
 225         return obj;
 226 }
 227
 228
 229 // yaffsfs_FindDirectory
 230 // Parse a path to determine the directory and the name within the directory.
 231 //
 232 // eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
 233 static yaffs_Object *yaffsfs_DoFindDirectory(yaffs_Object *startDir,const char *path,char **name,int symDepth)
 234 {
 235         yaffs_Object *dir;
 236         char *restOfPath;
 237         char str[YAFFS_MAX_NAME_LENGTH+1];
 238         int i;
 239
 240         if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES)
 241         {
 242                 return NULL;
 243         }
 244
 245         if(startDir)
 246         {
 247                 dir = startDir;
 248                 restOfPath = (char *)path;
 249         }
 250         else
 251         {
 252                 dir = yaffsfs_FindRoot(path,&restOfPath);
 253         }
 254
 255         while(dir)
 256         {
 257                 // parse off /.
 258                 // curve ball: also throw away surplus '/'
 259                 // eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
 260                 while(*restOfPath == '/')
 261                 {
 262                         restOfPath++; // get rid of '/'
 263                 }
 264
 265                 *name = restOfPath;
 266                 i = 0;
 267
 268                 while(*restOfPath && *restOfPath != '/')
 269                 {
 270                         if (i < YAFFS_MAX_NAME_LENGTH)
 271                         {
 272                                 str[i] = *restOfPath;
 273                                 str[i+1] = '\0';
 274                                 i++;
 275                         }
 276                         restOfPath++;
 277                 }
 278
 279                 if(!*restOfPath)
 280                 {
 281                         // got to the end of the string
 282                         return dir;
 283                 }
 284                 else
 285                 {
 286                         if(strcmp(str,".") == 0)
 287                         {
 288                                 // Do nothing
 289                         }
 290                         else if(strcmp(str,"..") == 0)
 291                         {
 292                                 dir = dir->parent;
 293                         }
 294                         else
 295                         {
 296                                 dir = yaffs_FindObjectByName(dir,str);
 297
 298                                 while(dir && dir->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
 299                                 {
 300
 301                                         dir = yaffsfs_FollowLink(dir,symDepth);
 302
 303                                 }
 304
 305                                 if(dir && dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 306                                 {
 307                                         dir = NULL;
 308                                 }
 309                         }
 310                 }
 311         }
 312         // directory did not exist.
 313         return NULL;
 314 }
 315
 316 static yaffs_Object *yaffsfs_FindDirectory(yaffs_Object *relativeDirectory,const char *path,char **name,int symDepth)
 317 {
 318         return yaffsfs_DoFindDirectory(relativeDirectory,path,name,symDepth);
 319 }
 320
 321 // yaffsfs_FindObject turns a path for an existing object into the object
 322 //
 323 static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path,int symDepth)
 324 {
 325         yaffs_Object *dir;
 326         char *name;
 327
 328         dir = yaffsfs_FindDirectory(relativeDirectory,path,&name,symDepth);
 329
 330         if(dir && *name)
 331         {
 332                 return yaffs_FindObjectByName(dir,name);
 333         }
 334
 335         return dir;
 336 }
 337
 338
 339
 340 int yaffs_open(const char *path, int oflag, int mode)
 341 {
 342         yaffs_Object *obj = NULL;
 343         yaffs_Object *dir = NULL;
 344         char *name;
 345         int handle = -1;
 346         yaffsfs_Handle *h = NULL;
 347         int alreadyOpen = 0;
 348         int alreadyExclusive = 0;
 349         int openDenied = 0;
 350         int symDepth = 0;
 351         int errorReported = 0;
 352
 353         int i;
 354
 355
 356         // todo sanity check oflag (eg. can't have O_TRUNC without WRONLY or RDWR
 357
 358
 359         yaffsfs_Lock();
 360
 361         handle = yaffsfs_GetHandle();
 362
 363         if(handle >= 0)
 364         {
 365
 366                 h = yaffsfs_GetHandlePointer(handle);
 367
 368
 369                 // try to find the exisiting object
 370                 obj = yaffsfs_FindObject(NULL,path,0);
 371
 372                 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
 373                 {
 374
 375                         obj = yaffsfs_FollowLink(obj,symDepth++);
 376                 }
 377
 378                 if(obj)
 379                 {
 380                         // Check if the object is already in use
 381                         alreadyOpen = alreadyExclusive = 0;
 382
 383                         for(i = 0; i <= YAFFSFS_N_HANDLES; i++)
 384                         {
 385
 386                                 if(i != handle &&
 387                                    yaffsfs_handle[i].inUse &&
 388                                     obj == yaffsfs_handle[i].obj)
 389                                  {
 390                                         alreadyOpen = 1;
 391                                         if(yaffsfs_handle[i].exclusive)
 392                                         {
 393                                                 alreadyExclusive = 1;
 394                                         }
 395                                  }
 396                         }
 397
 398                         if(((oflag & O_EXCL) && alreadyOpen) || alreadyExclusive)
 399                         {
 400                                 openDenied = 1;
 401                         }
 402
 403                         // Open should fail if O_CREAT and O_EXCL are specified
 404                         if((oflag & O_EXCL) && (oflag & O_CREAT))
 405                         {
 406                                 openDenied = 1;
 407                                 yaffsfs_SetError(-EEXIST);
 408                                 errorReported = 1;
 409                         }
 410
 411                         // Check file permissions
 412                         if( (oflag & (O_RDWR | O_WRONLY)) == 0 &&     // ie O_RDONLY
 413                            !(obj->st_mode & S_IREAD))
 414                         {
 415                                 openDenied = 1;
 416                         }
 417
 418                         if( (oflag & O_RDWR) &&
 419                            !(obj->st_mode & S_IREAD))
 420                         {
 421                                 openDenied = 1;
 422                         }
 423
 424                         if( (oflag & (O_RDWR | O_WRONLY)) &&
 425                            !(obj->st_mode & S_IWRITE))
 426                         {
 427                                 openDenied = 1;
 428                         }
 429
 430                 }
 431
 432                 else if((oflag & O_CREAT))
 433                 {
 434                         // Let's see if we can create this file
 435                         dir = yaffsfs_FindDirectory(NULL,path,&name,0);
 436                         if(dir)
 437                         {
 438                                 obj = yaffs_MknodFile(dir,name,mode,0,0);
 439                         }
 440                         else
 441                         {
 442                                 yaffsfs_SetError(-ENOTDIR);
 443                         }
 444                 }
 445
 446                 if(obj && !openDenied)
 447                 {
 448                         h->obj = obj;
 449                         h->inUse = 1;
 450                 h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1;
 451                         h->append =  (oflag & O_APPEND) ? 1 : 0;
 452                         h->exclusive = (oflag & O_EXCL) ? 1 : 0;
 453                         h->position = 0;
 454
 455                         obj->inUse++;
 456                         if((oflag & O_TRUNC) && !h->readOnly)
 457                         {
 458                                 //todo truncate
 459                                 yaffs_ResizeFile(obj,0);
 460                         }
 461
 462                 }
 463                 else
 464                 {
 465                         yaffsfs_PutHandle(handle);
 466                         if(!errorReported)
 467                         {
 468                                 yaffsfs_SetError(-EACCESS);
 469                                 errorReported = 1;
 470                         }
 471                         handle = -1;
 472                 }
 473
 474         }
 475
 476         yaffsfs_Unlock();
 477
 478         return handle;
 479 }
 480
 481 int yaffs_close(int fd)
 482 {
 483         yaffsfs_Handle *h = NULL;
 484         int retVal = 0;
 485
 486         yaffsfs_Lock();
 487
 488         h = yaffsfs_GetHandlePointer(fd);
 489
 490         if(h && h->inUse)
 491         {
 492                 // clean up
 493                 yaffs_FlushFile(h->obj,1);
 494                 h->obj->inUse--;
 495                 if(h->obj->inUse <= 0 && h->obj->unlinked)
 496                 {
 497                         yaffs_DeleteFile(h->obj);
 498                 }
 499                 yaffsfs_PutHandle(fd);
 500                 retVal = 0;
 501         }
 502         else
 503         {
 504                 // bad handle
 505                 yaffsfs_SetError(-EBADF);
 506                 retVal = -1;
 507         }
 508
 509         yaffsfs_Unlock();
 510
 511         return retVal;
 512 }
 513
 514 int yaffs_read(int fd, void *buf, unsigned int nbyte)
 515 {
 516         yaffsfs_Handle *h = NULL;
 517         yaffs_Object *obj = NULL;
 518         int pos = 0;
 519         int nRead = -1;
 520         int maxRead;
 521
 522         yaffsfs_Lock();
 523         h = yaffsfs_GetHandlePointer(fd);
 524         obj = yaffsfs_GetHandleObject(fd);
 525
 526         if(!h || !obj)
 527         {
 528                 // bad handle
 529                 yaffsfs_SetError(-EBADF);
 530         }
 531         else if( h && obj)
 532         {
 533                 pos=  h->position;
 534                 if(yaffs_GetObjectFileLength(obj) > pos)
 535                 {
 536                         maxRead = yaffs_GetObjectFileLength(obj) - pos;
 537                 }
 538                 else
 539                 {
 540                         maxRead = 0;
 541                 }
 542
 543                 if(nbyte > maxRead)
 544                 {
 545                         nbyte = maxRead;
 546                 }
 547
 548
 549                 if(nbyte > 0)
 550                 {
 551                         nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte);
 552                         if(nRead >= 0)
 553                         {
 554                                 h->position = pos + nRead;
 555                         }
 556                         else
 557                         {
 558                                 //todo error
 559                         }
 560                 }
 561                 else
 562                 {
 563                         nRead = 0;
 564                 }
 565
 566         }
 567
 568         yaffsfs_Unlock();
 569
 570
 571         return (nRead >= 0) ? nRead : -1;
 572
 573 }
 574
 575 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
 576 {
 577         yaffsfs_Handle *h = NULL;
 578         yaffs_Object *obj = NULL;
 579         int pos = 0;
 580         int nWritten = -1;
 581
 582         yaffsfs_Lock();
 583         h = yaffsfs_GetHandlePointer(fd);
 584         obj = yaffsfs_GetHandleObject(fd);
 585
 586         if(!h || !obj)
 587         {
 588                 // bad handle
 589                 yaffsfs_SetError(-EBADF);
 590         }
 591         else if( h && obj && h->readOnly)
 592         {
 593                 // todo error
 594         }
 595         else if( h && obj)
 596         {
 597                 if(h->append)
 598                 {
 599                         pos =  yaffs_GetObjectFileLength(obj);
 600                 }
 601                 else
 602                 {
 603                         pos = h->position;
 604                 }
 605
 606                 nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte);
 607
 608                 if(nWritten >= 0)
 609                 {
 610                         h->position = pos + nWritten;
 611                 }
 612                 else
 613                 {
 614                         //todo error
 615                 }
 616
 617         }
 618
 619         yaffsfs_Unlock();
 620
 621
 622         return (nWritten >= 0) ? nWritten : -1;
 623
 624 }
 625
 626 off_t yaffs_lseek(int fd, off_t offset, int whence)
 627 {
 628         yaffsfs_Handle *h = NULL;
 629         yaffs_Object *obj = NULL;
 630         int pos = -1;
 631         int fSize = -1;
 632
 633         yaffsfs_Lock();
 634         h = yaffsfs_GetHandlePointer(fd);
 635         obj = yaffsfs_GetHandleObject(fd);
 636
 637         if(!h || !obj)
 638         {
 639                 // bad handle
 640                 yaffsfs_SetError(-EBADF);
 641         }
 642         else if(whence == SEEK_SET)
 643         {
 644                 if(offset >= 0)
 645                 {
 646                         pos = offset;
 647                 }
 648         }
 649         else if(whence == SEEK_CUR)
 650         {
 651                 if( (h->position + offset) >= 0)
 652                 {
 653                         pos = (h->position + offset);
 654                 }
 655         }
 656         else if(whence == SEEK_END)
 657         {
 658                 fSize = yaffs_GetObjectFileLength(obj);
 659                 if(fSize >= 0 && (fSize + offset) >= 0)
 660                 {
 661                         pos = fSize + offset;
 662                 }
 663         }
 664
 665         if(pos >= 0)
 666         {
 667                 h->position = pos;
 668         }
 669         else
 670         {
 671                 // todo error
 672         }
 673
 674
 675         yaffsfs_Unlock();
 676
 677         return pos;
 678 }
 679
 680
 681 int yaffsfs_DoUnlink(const char *path,int isDirectory)
 682 {
 683         yaffs_Object *dir = NULL;
 684         yaffs_Object *obj = NULL;
 685         char *name;
 686         int result = YAFFS_FAIL;
 687
 688         yaffsfs_Lock();
 689
 690         obj = yaffsfs_FindObject(NULL,path,0);
 691         dir = yaffsfs_FindDirectory(NULL,path,&name,0);
 692         if(!dir)
 693         {
 694                 yaffsfs_SetError(-ENOTDIR);
 695         }
 696         else if(!obj)
 697         {
 698                 yaffsfs_SetError(-ENOENT);
 699         }
 700         else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
 701         {
 702                 yaffsfs_SetError(-EISDIR);
 703         }
 704         else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 705         {
 706                 yaffsfs_SetError(-ENOTDIR);
 707         }
 708         else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 709         {
 710                 yaffsfs_SetError(-ENOTDIR);
 711         }
 712         else
 713         {
 714                 result = yaffs_Unlink(dir,name);
 715
 716                 if(result == YAFFS_FAIL && isDirectory)
 717                 {
 718                         yaffsfs_SetError(-ENOTEMPTY);
 719                 }
 720         }
 721
 722         yaffsfs_Unlock();
 723
 724         // todo error
 725
 726         return (result == YAFFS_FAIL) ? -1 : 0;
 727 }
 728 int yaffs_rmdir(const char *path)
 729 {
 730         return yaffsfs_DoUnlink(path,1);
 731 }
 732
 733 int yaffs_unlink(const char *path)
 734 {
 735         return yaffsfs_DoUnlink(path,0);
 736 }
 737
 738 int yaffs_rename(const char *oldPath, const char *newPath)
 739 {
 740         yaffs_Object *olddir = NULL;
 741         yaffs_Object *newdir = NULL;
 742         char *oldname;
 743         char *newname;
 744         int result= YAFFS_FAIL;
 745
 746         yaffsfs_Lock();
 747
 748         olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
 749         newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
 750
 751         if(!olddir || !newdir)
 752         {
 753                 // bad handle
 754                 yaffsfs_SetError(-EBADF);
 755         }
 756         else if(olddir->myDev != newdir->myDev)
 757         {
 758                 // oops must be on same device
 759                 // todo error
 760                 yaffsfs_SetError(-EXDEV);
 761         }
 762         else
 763         {
 764                 result = yaffs_RenameObject(olddir,oldname,newdir,newname);
 765         }
 766
 767         yaffsfs_Unlock();
 768
 769         return (result == YAFFS_FAIL) ? -1 : 0;
 770 }
 771
 772
 773 static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
 774 {
 775         int retVal = -1;
 776
 777         if(obj)
 778         {
 779                 obj = yaffs_GetEquivalentObject(obj);
 780         }
 781
 782         if(obj && buf)
 783         {
 784         buf->st_dev = (int)obj->myDev->genericDevice;
 785         buf->st_ino = obj->objectId;
 786         buf->st_mode = obj->st_mode & ~S_IFMT; // clear out file type bits
 787
 788                 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
 789                 {
 790                         buf->st_mode |= S_IFDIR;
 791                 }
 792                 else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
 793                 {
 794                         buf->st_mode |= S_IFLNK;
 795                 }
 796                 else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
 797                 {
 798                         buf->st_mode |= S_IFREG;
 799                 }
 800
 801         buf->st_nlink = yaffs_GetObjectLinkCount(obj);
 802         buf->st_uid = 0;
 803         buf->st_gid = 0;;
 804         buf->st_rdev = obj->st_rdev;
 805         buf->st_size = yaffs_GetObjectFileLength(obj);
 806                 buf->st_blksize = YAFFS_BYTES_PER_CHUNK;
 807         buf->st_blocks = (buf->st_size + YAFFS_BYTES_PER_CHUNK -1)/YAFFS_BYTES_PER_CHUNK;
 808         buf->st_atime = obj->st_atime;
 809         buf->st_ctime = obj->st_ctime;
 810         buf->st_mtime = obj->st_mtime;
 811                 retVal = 0;
 812         }
 813         return retVal;
 814 }
 815
 816 static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int doLStat)
 817 {
 818         yaffs_Object *obj;
 819
 820         int retVal = -1;
 821
 822         yaffsfs_Lock();
 823         obj = yaffsfs_FindObject(NULL,path,0);
 824
 825         if(!doLStat && obj)
 826         {
 827                 obj = yaffsfs_FollowLink(obj,0);
 828         }
 829
 830         if(obj)
 831         {
 832                 retVal = yaffsfs_DoStat(obj,buf);
 833         }
 834         else
 835         {
 836                 // todo error not found
 837                 yaffsfs_SetError(-ENOENT);
 838         }
 839
 840         yaffsfs_Unlock();
 841
 842         return retVal;
 843
 844 }
 845
 846 int yaffs_stat(const char *path, struct yaffs_stat *buf)
 847 {
 848         return yaffsfs_DoStatOrLStat(path,buf,0);
 849 }
 850
 851 int yaffs_lstat(const char *path, struct yaffs_stat *buf)
 852 {
 853         return yaffsfs_DoStatOrLStat(path,buf,1);
 854 }
 855
 856 int yaffs_fstat(int fd, struct yaffs_stat *buf)
 857 {
 858         yaffs_Object *obj;
 859
 860         int retVal = -1;
 861
 862         yaffsfs_Lock();
 863         obj = yaffsfs_GetHandleObject(fd);
 864
 865         if(obj)
 866         {
 867                 retVal = yaffsfs_DoStat(obj,buf);
 868         }
 869         else
 870         {
 871                 // bad handle
 872                 yaffsfs_SetError(-EBADF);
 873         }
 874
 875         yaffsfs_Unlock();
 876
 877         return retVal;
 878 }
 879
 880 static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
 881 {
 882         int result;
 883
 884         if(obj)
 885         {
 886                 obj = yaffs_GetEquivalentObject(obj);
 887         }
 888
 889         if(obj)
 890         {
 891                 obj->st_mode = mode;
 892                 obj->dirty = 1;
 893                 result = yaffs_FlushFile(obj,0);
 894         }
 895
 896         return result == YAFFS_OK ? 0 : -1;
 897 }
 898
 899
 900 int yaffs_chmod(const char *path, mode_t mode)
 901 {
 902         yaffs_Object *obj;
 903
 904         int retVal = -1;
 905
 906         yaffsfs_Lock();
 907         obj = yaffsfs_FindObject(NULL,path,0);
 908
 909         if(obj)
 910         {
 911                 retVal = yaffsfs_DoChMod(obj,mode);
 912         }
 913         else
 914         {
 915                 // todo error not found
 916                 yaffsfs_SetError(-ENOENT);
 917         }
 918
 919         yaffsfs_Unlock();
 920
 921         return retVal;
 922
 923 }
 924
 925
 926 int yaffs_fchmod(int fd, mode_t mode)
 927 {
 928         yaffs_Object *obj;
 929
 930         int retVal = -1;
 931
 932         yaffsfs_Lock();
 933         obj = yaffsfs_GetHandleObject(fd);
 934
 935         if(obj)
 936         {
 937                 retVal = yaffsfs_DoChMod(obj,mode);
 938         }
 939         else
 940         {
 941                 // bad handle
 942                 yaffsfs_SetError(-EBADF);
 943         }
 944
 945         yaffsfs_Unlock();
 946
 947         return retVal;
 948 }
 949
 950
 951 int yaffs_mkdir(const char *path, mode_t mode)
 952 {
 953         yaffs_Object *parent = NULL;
 954         yaffs_Object *dir;
 955         char *name;
 956         int retVal= -1;
 957
 958         yaffsfs_Lock();
 959         parent = yaffsfs_FindDirectory(NULL,path,&name,0);
 960         dir = yaffs_MknodDirectory(parent,name,mode,0,0);
 961         if(dir)
 962         {
 963                 retVal = 0;
 964         }
 965         else
 966         {
 967                 yaffsfs_SetError(-ENOSPC); // just assume no space for now
 968                 retVal = -1;
 969         }
 970
 971         yaffsfs_Unlock();
 972
 973         return retVal;
 974 }
 975
 976 int yaffs_mount(const char *path)
 977 {
 978         int retVal=-1;
 979         int result=YAFFS_FAIL;
 980         yaffs_Device *dev=NULL;
 981         char *dummy;
 982
 983         yaffsfs_Lock();
 984         dev = yaffsfs_FindDevice(path,&dummy);
 985         if(dev)
 986         {
 987                 if(!dev->isMounted)
 988                 {
 989                         result = yaffs_GutsInitialise(dev);
 990                         if(result == YAFFS_FAIL)
 991                         {
 992                                 // todo error - mount failed
 993                                 yaffsfs_SetError(-ENOMEM);
 994                         }
 995                         retVal = result ? 0 : -1;
 996
 997                 }
 998                 else
 999                 {
1000                         //todo error - already mounted.
1001                         yaffsfs_SetError(-EBUSY);
1002                 }
1003         }
1004         else
1005         {
1006                 // todo error - no device
1007                 yaffsfs_SetError(-ENODEV);
1008         }
1009         yaffsfs_Unlock();
1010         return retVal;
1011
1012 }
1013
1014 int yaffs_unmount(const char *path)
1015 {
1016         int retVal=-1;
1017         yaffs_Device *dev=NULL;
1018         char *dummy;
1019
1020         yaffsfs_Lock();
1021         dev = yaffsfs_FindDevice(path,&dummy);
1022         if(dev)
1023         {
1024                 if(dev->isMounted)
1025                 {
1026                         int i;
1027                         int inUse;
1028                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++)
1029                         {
1030                                 if(yaffsfs_handle[i].inUse && yaffsfs_handle[i].obj->myDev == dev)
1031                                 {
1032                                         inUse = 1; // the device is in use, can't unmount
1033                                 }
1034                         }
1035
1036                         if(!inUse)
1037                         {
1038                                 yaffs_Deinitialise(dev);
1039
1040                                 retVal = 0;
1041                         }
1042                         else
1043                         {
1044                                 // todo error can't unmount as files are open
1045                                 yaffsfs_SetError(-EBUSY);
1046                         }
1047
1048                 }
1049                 else
1050                 {
1051                         //todo error - not mounted.
1052                         yaffsfs_SetError(-EINVAL);
1053
1054                 }
1055         }
1056         else
1057         {
1058                 // todo error - no device
1059                 yaffsfs_SetError(-ENODEV);
1060         }
1061         yaffsfs_Unlock();
1062         return retVal;
1063
1064 }
1065
1066 off_t yaffs_freespace(const char *path)
1067 {
1068         off_t retVal=-1;
1069         yaffs_Device *dev=NULL;
1070         char *dummy;
1071
1072         yaffsfs_Lock();
1073         dev = yaffsfs_FindDevice(path,&dummy);
1074         if(dev)
1075         {
1076                 retVal = yaffs_GetNumberOfFreeChunks(dev);
1077                 retVal *= YAFFS_BYTES_PER_CHUNK;
1078
1079         }
1080         else
1081         {
1082                 yaffsfs_SetError(-EINVAL);
1083         }
1084
1085         yaffsfs_Unlock();
1086         return retVal;
1087 }
1088
1089 void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList)
1090 {
1091
1092         yaffsfs_DeviceConfiguration *cfg;
1093
1094         yaffsfs_configurationList = cfgList;
1095
1096         yaffsfs_InitHandles();
1097
1098         cfg = yaffsfs_configurationList;
1099
1100         while(cfg && cfg->prefix && cfg->dev)
1101         {
1102                 cfg->dev->isMounted = 0;
1103                 cfg++;
1104         }
1105
1106
1107 }
1108
1109
1110 //
1111 // Directory search stuff.
1112
1113 yaffs_DIR *yaffs_opendir(const char *dirname)
1114 {
1115         yaffs_DIR *dir = NULL;
1116         yaffs_Object *obj = NULL;
1117         yaffsfs_DirectorySearchContext *dsc = NULL;
1118
1119         yaffsfs_Lock();
1120
1121         obj = yaffsfs_FindObject(NULL,dirname,0);
1122
1123         if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1124         {
1125
1126                 dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
1127                 dir = (yaffs_DIR *)dsc;
1128                 if(dsc)
1129                 {
1130                         dsc->magic = YAFFS_MAGIC;
1131                         dsc->list = NULL;
1132                         memset(dsc->name,0,NAME_MAX+1);
1133                         strncpy(dsc->name,dirname,NAME_MAX);
1134                 }
1135
1136         }
1137
1138         yaffsfs_Unlock();
1139
1140         return dir;
1141 }
1142
1143 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
1144 {
1145         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1146         struct yaffs_dirent *retVal = NULL;
1147         struct list_head *i;
1148         yaffs_Object *entry = NULL;
1149         int offset;
1150         yaffs_Object *obj = NULL;
1151         struct yaffsfs_ObjectListEntry *list = NULL;
1152         int inList = 0;
1153
1154         yaffsfs_Lock();
1155
1156         offset = -1;
1157
1158         if(dsc && dsc->magic == YAFFS_MAGIC)
1159         {
1160                 yaffsfs_SetError(0);
1161
1162                 obj = yaffsfs_FindObject(NULL,dsc->name,0);
1163
1164                 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1165                 {
1166
1167                         list_for_each(i,&obj->variant.directoryVariant.children)
1168                         {
1169                                         offset++;
1170                                         entry = (i) ?  list_entry(i, yaffs_Object,siblings) : NULL;
1171
1172                                         if(entry)
1173                                         {
1174                                                 list = dsc->list;
1175                                                 inList = 0;
1176                                                 while(list && !inList)
1177                                                 {
1178                                                         if(list->objectId == entry->objectId)
1179                                                         {
1180                                                                 inList = 1;
1181                                                         }
1182                                                         list = list->next;
1183                                                 }
1184
1185                                                 if(!inList) goto foundNew;
1186                                         }
1187
1188                         }
1189
1190                         foundNew:
1191
1192                         if(!inList && entry)
1193                         {
1194                                 //This is the entry we're going to return;
1195                                 struct yaffsfs_ObjectListEntry *le;
1196
1197                                 le = YMALLOC(sizeof(struct yaffsfs_ObjectListEntry));
1198
1199                                 if(le)
1200                                 {
1201                                         le->next =  dsc->list;
1202                                         le->objectId = entry->objectId;
1203                                         dsc->list = le;
1204
1205                                         dsc->de.d_ino = yaffs_GetEquivalentObject(entry)->objectId;
1206                                         dsc->de.d_off = offset;
1207                                         yaffs_GetObjectName(entry,dsc->de.d_name,NAME_MAX+1);
1208                                         dsc->de.d_reclen = sizeof(struct yaffs_dirent);
1209
1210                                         retVal = &dsc->de;
1211                                 }
1212
1213                         }
1214                 }
1215
1216         }
1217         else
1218         {
1219                 yaffsfs_SetError(-EBADF);
1220         }
1221
1222         yaffsfs_Unlock();
1223
1224         return retVal;
1225
1226 }
1227
1228 void yaffsfs_ListClear(yaffsfs_DirectorySearchContext *dsc)
1229 {
1230
1231         struct yaffsfs_ObjectListEntry *le;
1232
1233         if(dsc && dsc->magic == YAFFS_MAGIC)
1234         {
1235                 while(dsc->list)
1236                 {
1237                         le = dsc->list;
1238                         dsc->list = dsc->list->next;
1239                         YFREE(le);
1240                 }
1241         }
1242
1243 }
1244
1245 void yaffs_rewinddir(yaffs_DIR *dirp)
1246 {
1247         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1248
1249         yaffsfs_Lock();
1250         yaffsfs_ListClear(dsc);
1251         yaffsfs_Unlock();
1252 }
1253
1254
1255 int yaffs_closedir(yaffs_DIR *dirp)
1256 {
1257         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1258
1259         yaffsfs_Lock();
1260         yaffsfs_ListClear(dsc);
1261         dsc->magic = 0;
1262         YFREE(dsc);
1263         yaffsfs_Unlock();
1264         return 0;
1265 }
1266
1267
1268
1269 int yaffs_symlink(const char *oldpath, const char *newpath)
1270 {
1271         yaffs_Object *parent = NULL;
1272         yaffs_Object *obj;
1273         char *name;
1274         int retVal= -1;
1275         int mode = 0; // ignore for now
1276
1277         yaffsfs_Lock();
1278         parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
1279         obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
1280         if(obj)
1281         {
1282                 retVal = 0;
1283         }
1284         else
1285         {
1286                 yaffsfs_SetError(-ENOSPC); // just assume no space for now
1287                 retVal = -1;
1288         }
1289
1290         yaffsfs_Unlock();
1291
1292         return retVal;
1293
1294 }
1295
1296 int yaffs_readlink(const char *path, char *buf, int bufsiz)
1297 {
1298         yaffs_Object *obj = NULL;
1299         int retVal;
1300
1301
1302         yaffsfs_Lock();
1303
1304         obj = yaffsfs_FindObject(NULL,path,0);
1305
1306         if(!obj)
1307         {
1308                 yaffsfs_SetError(-ENOENT);
1309                 retVal = -1;
1310         }
1311         else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK)
1312         {
1313                 yaffsfs_SetError(-EINVAL);
1314                 retVal = -1;
1315         }
1316         else
1317         {
1318                 char *alias = obj->variant.symLinkVariant.alias;
1319                 memset(buf,0,bufsiz);
1320                 strncpy(buf,alias,bufsiz - 1);
1321                 retVal = 0;
1322         }
1323         yaffsfs_Unlock();
1324         return retVal;
1325 }
1326
1327 int yaffs_link(const char *oldpath, const char *newpath);
1328 int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
1329
1330 int yaffs_DumpDevStruct(const char *path)
1331 {
1332         char *rest;
1333
1334         yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
1335
1336         if(obj)
1337         {
1338                 yaffs_Device *dev = obj->myDev;
1339
1340                 printf("\n"
1341                            "nPageWrites.......... %d\n"
1342                            "nPageReads........... %d\n"
1343                            "nBlockErasures....... %d\n"
1344                            "nGCCopies............ %d\n"
1345                            "garbageCollections... %d\n"
1346                            "passiveGarbageColl'ns %d\n"
1347                            "\n",
1348                                 dev->nPageWrites,
1349                                 dev->nPageReads,
1350                                 dev->nBlockErasures,
1351                                 dev->nGCCopies,
1352                                 dev->garbageCollections,
1353                                 dev->passiveGarbageCollections
1354                 );
1355         }
1356         return 0;
1357 }
1358