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 1.3 2003-02-19 00:29:55 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
 352         int i;
 353
 354
 355         // todo sanity check oflag (eg. can't have O_TRUNC without WRONLY or RDWR
 356
 357
 358         yaffsfs_Lock();
 359
 360         handle = yaffsfs_GetHandle();
 361
 362         if(handle >= 0)
 363         {
 364
 365                 h = yaffsfs_GetHandlePointer(handle);
 366
 367
 368                 // try to find the exisiting object
 369                 obj = yaffsfs_FindObject(NULL,path,0);
 370
 371                 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
 372                 {
 373
 374                         obj = yaffsfs_FollowLink(obj,symDepth++);
 375                 }
 376
 377                 if(obj)
 378                 {
 379                         // Check if the object is already in use
 380                         alreadyOpen = alreadyExclusive = 0;
 381
 382                         for(i = 0; i <= YAFFSFS_N_HANDLES; i++)
 383                         {
 384
 385                                 if(i != handle &&
 386                                    yaffsfs_handle[i].inUse &&
 387                                     obj == yaffsfs_handle[i].obj)
 388                                  {
 389                                         alreadyOpen = 1;
 390                                         if(yaffsfs_handle[i].exclusive)
 391                                         {
 392                                                 alreadyExclusive = 1;
 393                                         }
 394                                  }
 395                         }
 396
 397                         if(((oflag & O_EXCL) && alreadyOpen) || alreadyExclusive)
 398                         {
 399                                 openDenied = 1;
 400                         }
 401
 402                         // Check file permissions
 403                         if( (oflag & (O_RDWR | O_WRONLY)) == 0 &&     // ie O_RDONLY
 404                            !(obj->st_mode & S_IREAD))
 405                         {
 406                                 openDenied = 1;
 407                         }
 408
 409                         if( (oflag & O_RDWR) &&
 410                            !(obj->st_mode & S_IREAD))
 411                         {
 412                                 openDenied = 1;
 413                         }
 414
 415                         if( (oflag & (O_RDWR | O_WRONLY)) &&
 416                            !(obj->st_mode & S_IWRITE))
 417                         {
 418                                 openDenied = 1;
 419                         }
 420
 421                 }
 422
 423                 else if((oflag & O_CREAT))
 424                 {
 425                         // Let's see if we can create this file
 426                         dir = yaffsfs_FindDirectory(NULL,path,&name,0);
 427                         if(dir)
 428                         {
 429                                 obj = yaffs_MknodFile(dir,name,mode,0,0);
 430                         }
 431                         else
 432                         {
 433                         } yaffsfs_SetError(-ENOTDIR);
 434                 }
 435
 436                 if(obj && !openDenied)
 437                 {
 438                         h->obj = obj;
 439                         h->inUse = 1;
 440                 h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1;
 441                         h->append =  (oflag & O_APPEND) ? 1 : 0;
 442                         h->exclusive = (oflag & O_EXCL) ? 1 : 0;
 443                         h->position = 0;
 444
 445                         obj->inUse++;
 446                         if((oflag & O_TRUNC) && !h->readOnly)
 447                         {
 448                                 //todo truncate
 449                                 yaffs_ResizeFile(obj,0);
 450                         }
 451
 452                 }
 453                 else
 454                 {
 455                         yaffsfs_PutHandle(handle);
 456                         yaffsfs_SetError(-EACCESS);
 457                         handle = -1;
 458                 }
 459
 460         }
 461
 462         yaffsfs_Unlock();
 463
 464         return handle;
 465 }
 466
 467 int yaffs_close(int fd)
 468 {
 469         yaffsfs_Handle *h = NULL;
 470         int retVal = 0;
 471
 472         yaffsfs_Lock();
 473
 474         h = yaffsfs_GetHandlePointer(fd);
 475
 476         if(h && h->inUse)
 477         {
 478                 // clean up
 479                 yaffs_FlushFile(h->obj,1);
 480                 h->obj->inUse--;
 481                 if(h->obj->inUse <= 0 && h->obj->unlinked)
 482                 {
 483                         yaffs_DeleteFile(h->obj);
 484                 }
 485                 yaffsfs_PutHandle(fd);
 486                 retVal = 0;
 487         }
 488         else
 489         {
 490                 // bad handle
 491                 yaffsfs_SetError(-EBADF);
 492                 retVal = -1;
 493         }
 494
 495         yaffsfs_Unlock();
 496
 497         return retVal;
 498 }
 499
 500 int yaffs_read(int fd, void *buf, unsigned int nbyte)
 501 {
 502         yaffsfs_Handle *h = NULL;
 503         yaffs_Object *obj = NULL;
 504         int pos = 0;
 505         int nRead = -1;
 506         int maxRead;
 507
 508         yaffsfs_Lock();
 509         h = yaffsfs_GetHandlePointer(fd);
 510         obj = yaffsfs_GetHandleObject(fd);
 511
 512         if(!h || !obj)
 513         {
 514                 // bad handle
 515                 yaffsfs_SetError(-EBADF);
 516         }
 517         else if( h && obj)
 518         {
 519                 pos=  h->position;
 520                 if(yaffs_GetObjectFileLength(obj) > pos)
 521                 {
 522                         maxRead = yaffs_GetObjectFileLength(obj) - pos;
 523                 }
 524                 else
 525                 {
 526                         maxRead = 0;
 527                 }
 528
 529                 if(nbyte > maxRead)
 530                 {
 531                         nbyte = maxRead;
 532                 }
 533
 534
 535                 if(nbyte > 0)
 536                 {
 537                         nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte);
 538                         if(nRead >= 0)
 539                         {
 540                                 h->position = pos + nRead;
 541                         }
 542                         else
 543                         {
 544                                 //todo error
 545                         }
 546                 }
 547                 else
 548                 {
 549                         nRead = 0;
 550                 }
 551
 552         }
 553
 554         yaffsfs_Unlock();
 555
 556
 557         return (nRead >= 0) ? nRead : -1;
 558
 559 }
 560
 561 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
 562 {
 563         yaffsfs_Handle *h = NULL;
 564         yaffs_Object *obj = NULL;
 565         int pos = 0;
 566         int nWritten = -1;
 567
 568         yaffsfs_Lock();
 569         h = yaffsfs_GetHandlePointer(fd);
 570         obj = yaffsfs_GetHandleObject(fd);
 571
 572         if(!h || !obj)
 573         {
 574                 // bad handle
 575                 yaffsfs_SetError(-EBADF);
 576         }
 577         else if( h && obj && h->readOnly)
 578         {
 579                 // todo error
 580         }
 581         else if( h && obj)
 582         {
 583                 if(h->append)
 584                 {
 585                         pos =  yaffs_GetObjectFileLength(obj);
 586                 }
 587                 else
 588                 {
 589                         pos = h->position;
 590                 }
 591
 592                 nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte);
 593
 594                 if(nWritten >= 0)
 595                 {
 596                         h->position = pos + nWritten;
 597                 }
 598                 else
 599                 {
 600                         //todo error
 601                 }
 602
 603         }
 604
 605         yaffsfs_Unlock();
 606
 607
 608         return (nWritten >= 0) ? nWritten : -1;
 609
 610 }
 611
 612 off_t yaffs_lseek(int fd, off_t offset, int whence)
 613 {
 614         yaffsfs_Handle *h = NULL;
 615         yaffs_Object *obj = NULL;
 616         int pos = -1;
 617         int fSize = -1;
 618
 619         yaffsfs_Lock();
 620         h = yaffsfs_GetHandlePointer(fd);
 621         obj = yaffsfs_GetHandleObject(fd);
 622
 623         if(!h || !obj)
 624         {
 625                 // bad handle
 626                 yaffsfs_SetError(-EBADF);
 627         }
 628         else if(whence == SEEK_SET)
 629         {
 630                 if(offset >= 0)
 631                 {
 632                         pos = offset;
 633                 }
 634         }
 635         else if(whence == SEEK_CUR)
 636         {
 637                 if( (h->position + offset) >= 0)
 638                 {
 639                         pos = (h->position + offset);
 640                 }
 641         }
 642         else if(whence == SEEK_END)
 643         {
 644                 fSize = yaffs_GetObjectFileLength(obj);
 645                 if(fSize >= 0 && (fSize + offset) >= 0)
 646                 {
 647                         pos = fSize + offset;
 648                 }
 649         }
 650
 651         if(pos >= 0)
 652         {
 653                 h->position = pos;
 654         }
 655         else
 656         {
 657                 // todo error
 658         }
 659
 660
 661         yaffsfs_Unlock();
 662
 663         return pos;
 664 }
 665
 666
 667 int yaffsfs_DoUnlink(const char *path,int isDirectory)
 668 {
 669         yaffs_Object *dir = NULL;
 670         yaffs_Object *obj = NULL;
 671         char *name;
 672         int result = YAFFS_FAIL;
 673
 674         yaffsfs_Lock();
 675
 676         obj = yaffsfs_FindObject(NULL,path,0);
 677         dir = yaffsfs_FindDirectory(NULL,path,&name,0);
 678         if(!dir)
 679         {
 680                 yaffsfs_SetError(-ENOTDIR);
 681         }
 682         else if(!obj)
 683         {
 684                 yaffsfs_SetError(-ENOENT);
 685         }
 686         else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
 687         {
 688                 yaffsfs_SetError(-EISDIR);
 689         }
 690         else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 691         {
 692                 yaffsfs_SetError(-ENOTDIR);
 693         }
 694         else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 695         {
 696                 yaffsfs_SetError(-ENOTDIR);
 697         }
 698         else
 699         {
 700                 result = yaffs_Unlink(dir,name);
 701
 702                 if(result == YAFFS_FAIL && isDirectory)
 703                 {
 704                         yaffsfs_SetError(-ENOTEMPTY);
 705                 }
 706         }
 707
 708         yaffsfs_Unlock();
 709
 710         // todo error
 711
 712         return (result == YAFFS_FAIL) ? -1 : 0;
 713 }
 714 int yaffs_rmdir(const char *path)
 715 {
 716         return yaffsfs_DoUnlink(path,1);
 717 }
 718
 719 int yaffs_unlink(const char *path)
 720 {
 721         return yaffsfs_DoUnlink(path,0);
 722 }
 723
 724 int yaffs_rename(const char *oldPath, const char *newPath)
 725 {
 726         yaffs_Object *olddir = NULL;
 727         yaffs_Object *newdir = NULL;
 728         char *oldname;
 729         char *newname;
 730         int result= YAFFS_FAIL;
 731
 732         yaffsfs_Lock();
 733
 734         olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
 735         newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
 736
 737         if(!olddir || !newdir)
 738         {
 739                 // bad handle
 740                 yaffsfs_SetError(-EBADF);
 741         }
 742         else if(olddir->myDev != newdir->myDev)
 743         {
 744                 // oops must be on same device
 745                 // todo error
 746                 yaffsfs_SetError(-EXDEV);
 747         }
 748         else
 749         {
 750                 result = yaffs_RenameObject(olddir,oldname,newdir,newname);
 751         }
 752
 753         yaffsfs_Unlock();
 754
 755         return (result == YAFFS_FAIL) ? -1 : 0;
 756 }
 757
 758
 759 static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
 760 {
 761         int retVal = -1;
 762
 763         if(obj)
 764         {
 765                 obj = yaffs_GetEquivalentObject(obj);
 766         }
 767
 768         if(obj && buf)
 769         {
 770         buf->st_dev = (int)obj->myDev->genericDevice;
 771         buf->st_ino = obj->objectId;
 772         buf->st_mode = obj->st_mode & ~S_IFMT; // clear out file type bits
 773
 774                 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
 775                 {
 776                         buf->st_mode |= S_IFDIR;
 777                 }
 778                 else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
 779                 {
 780                         buf->st_mode |= S_IFLNK;
 781                 }
 782                 else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
 783                 {
 784                         buf->st_mode |= S_IFREG;
 785                 }
 786
 787         buf->st_nlink = yaffs_GetObjectLinkCount(obj);
 788         buf->st_uid = 0;
 789         buf->st_gid = 0;;
 790         buf->st_rdev = obj->st_rdev;
 791         buf->st_size = yaffs_GetObjectFileLength(obj);
 792                 buf->st_blksize = YAFFS_BYTES_PER_CHUNK;
 793         buf->st_blocks = (buf->st_size + YAFFS_BYTES_PER_CHUNK -1)/YAFFS_BYTES_PER_CHUNK;
 794         buf->st_atime = obj->st_atime;
 795         buf->st_ctime = obj->st_ctime;
 796         buf->st_mtime = obj->st_mtime;
 797                 retVal = 0;
 798         }
 799         return retVal;
 800 }
 801
 802 static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int doLStat)
 803 {
 804         yaffs_Object *obj;
 805
 806         int retVal = -1;
 807
 808         yaffsfs_Lock();
 809         obj = yaffsfs_FindObject(NULL,path,0);
 810
 811         if(!doLStat && obj)
 812         {
 813                 obj = yaffsfs_FollowLink(obj,0);
 814         }
 815
 816         if(obj)
 817         {
 818                 retVal = yaffsfs_DoStat(obj,buf);
 819         }
 820         else
 821         {
 822                 // todo error not found
 823                 yaffsfs_SetError(-ENOENT);
 824         }
 825
 826         yaffsfs_Unlock();
 827
 828         return retVal;
 829
 830 }
 831
 832 int yaffs_stat(const char *path, struct yaffs_stat *buf)
 833 {
 834         return yaffsfs_DoStatOrLStat(path,buf,0);
 835 }
 836
 837 int yaffs_lstat(const char *path, struct yaffs_stat *buf)
 838 {
 839         return yaffsfs_DoStatOrLStat(path,buf,1);
 840 }
 841
 842 int yaffs_fstat(int fd, struct yaffs_stat *buf)
 843 {
 844         yaffs_Object *obj;
 845
 846         int retVal = -1;
 847
 848         yaffsfs_Lock();
 849         obj = yaffsfs_GetHandleObject(fd);
 850
 851         if(obj)
 852         {
 853                 retVal = yaffsfs_DoStat(obj,buf);
 854         }
 855         else
 856         {
 857                 // bad handle
 858                 yaffsfs_SetError(-EBADF);
 859         }
 860
 861         yaffsfs_Unlock();
 862
 863         return retVal;
 864 }
 865
 866 static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
 867 {
 868         int result;
 869
 870         if(obj)
 871         {
 872                 obj = yaffs_GetEquivalentObject(obj);
 873         }
 874
 875         if(obj)
 876         {
 877                 obj->st_mode = mode;
 878                 obj->dirty = 1;
 879                 result = yaffs_FlushFile(obj,0);
 880         }
 881
 882         return result == YAFFS_OK ? 0 : -1;
 883 }
 884
 885
 886 int yaffs_chmod(const char *path, mode_t mode)
 887 {
 888         yaffs_Object *obj;
 889
 890         int retVal = -1;
 891
 892         yaffsfs_Lock();
 893         obj = yaffsfs_FindObject(NULL,path,0);
 894
 895         if(obj)
 896         {
 897                 retVal = yaffsfs_DoChMod(obj,mode);
 898         }
 899         else
 900         {
 901                 // todo error not found
 902                 yaffsfs_SetError(-ENOENT);
 903         }
 904
 905         yaffsfs_Unlock();
 906
 907         return retVal;
 908
 909 }
 910
 911
 912 int yaffs_fchmod(int fd, mode_t mode)
 913 {
 914         yaffs_Object *obj;
 915
 916         int retVal = -1;
 917
 918         yaffsfs_Lock();
 919         obj = yaffsfs_GetHandleObject(fd);
 920
 921         if(obj)
 922         {
 923                 retVal = yaffsfs_DoChMod(obj,mode);
 924         }
 925         else
 926         {
 927                 // bad handle
 928                 yaffsfs_SetError(-EBADF);
 929         }
 930
 931         yaffsfs_Unlock();
 932
 933         return retVal;
 934 }
 935
 936
 937 int yaffs_mkdir(const char *path, mode_t mode)
 938 {
 939         yaffs_Object *parent = NULL;
 940         yaffs_Object *dir;
 941         char *name;
 942         int retVal= -1;
 943
 944         yaffsfs_Lock();
 945         parent = yaffsfs_FindDirectory(NULL,path,&name,0);
 946         dir = yaffs_MknodDirectory(parent,name,mode,0,0);
 947         if(dir)
 948         {
 949                 retVal = 0;
 950         }
 951         else
 952         {
 953                 yaffsfs_SetError(-ENOSPC); // just assume no space for now
 954                 retVal = -1;
 955         }
 956
 957         yaffsfs_Unlock();
 958
 959         return retVal;
 960 }
 961
 962 int yaffs_mount(const char *path)
 963 {
 964         int retVal=-1;
 965         int result=YAFFS_FAIL;
 966         yaffs_Device *dev=NULL;
 967         char *dummy;
 968
 969         yaffsfs_Lock();
 970         dev = yaffsfs_FindDevice(path,&dummy);
 971         if(dev)
 972         {
 973                 if(!dev->isMounted)
 974                 {
 975                         result = yaffs_GutsInitialise(dev);
 976                         if(result == YAFFS_FAIL)
 977                         {
 978                                 // todo error - mount failed
 979                                 yaffsfs_SetError(-ENOMEM);
 980                         }
 981                         retVal = result ? 0 : -1;
 982
 983                 }
 984                 else
 985                 {
 986                         //todo error - already mounted.
 987                         yaffsfs_SetError(-EBUSY);
 988                 }
 989         }
 990         else
 991         {
 992                 // todo error - no device
 993                 yaffsfs_SetError(-ENODEV);
 994         }
 995         yaffsfs_Unlock();
 996         return retVal;
 997
 998 }
 999
1000 int yaffs_unmount(const char *path)
1001 {
1002         int retVal=-1;
1003         yaffs_Device *dev=NULL;
1004         char *dummy;
1005
1006         yaffsfs_Lock();
1007         dev = yaffsfs_FindDevice(path,&dummy);
1008         if(dev)
1009         {
1010                 if(dev->isMounted)
1011                 {
1012                         int i;
1013                         int inUse;
1014                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++)
1015                         {
1016                                 if(yaffsfs_handle[i].inUse && yaffsfs_handle[i].obj->myDev == dev)
1017                                 {
1018                                         inUse = 1; // the device is in use, can't unmount
1019                                 }
1020                         }
1021
1022                         if(!inUse)
1023                         {
1024                                 yaffs_Deinitialise(dev);
1025
1026                                 retVal = 0;
1027                         }
1028                         else
1029                         {
1030                                 // todo error can't unmount as files are open
1031                                 yaffsfs_SetError(-EBUSY);
1032                         }
1033
1034                 }
1035                 else
1036                 {
1037                         //todo error - not mounted.
1038                         yaffsfs_SetError(-EINVAL);
1039
1040                 }
1041         }
1042         else
1043         {
1044                 // todo error - no device
1045                 yaffsfs_SetError(-ENODEV);
1046         }
1047         yaffsfs_Unlock();
1048         return retVal;
1049
1050 }
1051
1052 off_t yaffs_freespace(const char *path)
1053 {
1054         off_t retVal=-1;
1055         yaffs_Device *dev=NULL;
1056         char *dummy;
1057
1058         yaffsfs_Lock();
1059         dev = yaffsfs_FindDevice(path,&dummy);
1060         if(dev)
1061         {
1062                 retVal = yaffs_GetNumberOfFreeChunks(dev);
1063                 retVal *= YAFFS_BYTES_PER_CHUNK;
1064
1065         }
1066         else
1067         {
1068                 yaffsfs_SetError(-EINVAL);
1069         }
1070
1071         yaffsfs_Unlock();
1072         return retVal;
1073 }
1074
1075 void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList)
1076 {
1077
1078         yaffsfs_DeviceConfiguration *cfg;
1079
1080         yaffsfs_configurationList = cfgList;
1081
1082         yaffsfs_InitHandles();
1083
1084         cfg = yaffsfs_configurationList;
1085
1086         while(cfg && cfg->prefix && cfg->dev)
1087         {
1088                 cfg->dev->isMounted = 0;
1089                 cfg++;
1090         }
1091
1092
1093 }
1094
1095
1096 //
1097 // Directory search stuff.
1098
1099 yaffs_DIR *yaffs_opendir(const char *dirname)
1100 {
1101         yaffs_DIR *dir = NULL;
1102         yaffs_Object *obj = NULL;
1103         yaffsfs_DirectorySearchContext *dsc = NULL;
1104
1105         yaffsfs_Lock();
1106
1107         obj = yaffsfs_FindObject(NULL,dirname,0);
1108
1109         if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1110         {
1111
1112                 dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
1113                 dir = (yaffs_DIR *)dsc;
1114                 if(dsc)
1115                 {
1116                         dsc->magic = YAFFS_MAGIC;
1117                         dsc->list = NULL;
1118                         memset(dsc->name,0,NAME_MAX+1);
1119                         strncpy(dsc->name,dirname,NAME_MAX);
1120                 }
1121
1122         }
1123
1124         yaffsfs_Unlock();
1125
1126         return dir;
1127 }
1128
1129 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
1130 {
1131         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1132         struct yaffs_dirent *retVal = NULL;
1133         struct list_head *i;
1134         yaffs_Object *entry = NULL;
1135         int offset;
1136         yaffs_Object *obj = NULL;
1137         struct yaffsfs_ObjectListEntry *list = NULL;
1138         int inList = 0;
1139
1140         yaffsfs_Lock();
1141
1142         offset = -1;
1143
1144         if(dsc && dsc->magic == YAFFS_MAGIC)
1145         {
1146                 yaffsfs_SetError(0);
1147
1148                 obj = yaffsfs_FindObject(NULL,dsc->name,0);
1149
1150                 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1151                 {
1152
1153                         list_for_each(i,&obj->variant.directoryVariant.children)
1154                         {
1155                                         offset++;
1156                                         entry = (i) ?  list_entry(i, yaffs_Object,siblings) : NULL;
1157
1158                                         if(entry)
1159                                         {
1160                                                 list = dsc->list;
1161                                                 inList = 0;
1162                                                 while(list && !inList)
1163                                                 {
1164                                                         if(list->objectId == entry->objectId)
1165                                                         {
1166                                                                 inList = 1;
1167                                                         }
1168                                                         list = list->next;
1169                                                 }
1170
1171                                                 if(!inList) goto foundNew;
1172                                         }
1173
1174                         }
1175
1176                         foundNew:
1177
1178                         if(!inList && entry)
1179                         {
1180                                 //This is the entry we're going to return;
1181                                 struct yaffsfs_ObjectListEntry *le;
1182
1183                                 le = YMALLOC(sizeof(struct yaffsfs_ObjectListEntry));
1184
1185                                 if(le)
1186                                 {
1187                                         le->next =  dsc->list;
1188                                         le->objectId = entry->objectId;
1189                                         dsc->list = le;
1190
1191                                         dsc->de.d_ino = yaffs_GetEquivalentObject(entry)->objectId;
1192                                         dsc->de.d_off = offset;
1193                                         yaffs_GetObjectName(entry,dsc->de.d_name,NAME_MAX+1);
1194                                         dsc->de.d_reclen = sizeof(struct yaffs_dirent);
1195
1196                                         retVal = &dsc->de;
1197                                 }
1198
1199                         }
1200                 }
1201
1202         }
1203         else
1204         {
1205                 yaffsfs_SetError(-EBADF);
1206         }
1207
1208         yaffsfs_Unlock();
1209
1210         return retVal;
1211
1212 }
1213
1214 void yaffsfs_ListClear(yaffsfs_DirectorySearchContext *dsc)
1215 {
1216
1217         struct yaffsfs_ObjectListEntry *le;
1218
1219         if(dsc && dsc->magic == YAFFS_MAGIC)
1220         {
1221                 while(dsc->list)
1222                 {
1223                         le = dsc->list;
1224                         dsc->list = dsc->list->next;
1225                         YFREE(le);
1226                 }
1227         }
1228
1229 }
1230
1231 void yaffs_rewinddir(yaffs_DIR *dirp)
1232 {
1233         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1234
1235         yaffsfs_Lock();
1236         yaffsfs_ListClear(dsc);
1237         yaffsfs_Unlock();
1238 }
1239
1240
1241 int yaffs_closedir(yaffs_DIR *dirp)
1242 {
1243         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1244
1245         yaffsfs_Lock();
1246         yaffsfs_ListClear(dsc);
1247         dsc->magic = 0;
1248         YFREE(dsc);
1249         yaffsfs_Unlock();
1250         return 0;
1251 }
1252
1253
1254
1255 int yaffs_symlink(const char *oldpath, const char *newpath)
1256 {
1257         yaffs_Object *parent = NULL;
1258         yaffs_Object *obj;
1259         char *name;
1260         int retVal= -1;
1261         int mode = 0; // ignore for now
1262
1263         yaffsfs_Lock();
1264         parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
1265         obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
1266         if(obj)
1267         {
1268                 retVal = 0;
1269         }
1270         else
1271         {
1272                 yaffsfs_SetError(-ENOSPC); // just assume no space for now
1273                 retVal = -1;
1274         }
1275
1276         yaffsfs_Unlock();
1277
1278         return retVal;
1279
1280 }
1281
1282 int yaffs_readlink(const char *path, char *buf, int bufsiz)
1283 {
1284         yaffs_Object *obj = NULL;
1285         int retVal;
1286
1287
1288         yaffsfs_Lock();
1289
1290         obj = yaffsfs_FindObject(NULL,path,0);
1291
1292         if(!obj)
1293         {
1294                 yaffsfs_SetError(-ENOENT);
1295                 retVal = -1;
1296         }
1297         else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK)
1298         {
1299                 yaffsfs_SetError(-EINVAL);
1300                 retVal = -1;
1301         }
1302         else
1303         {
1304                 char *alias = obj->variant.symLinkVariant.alias;
1305                 memset(buf,0,bufsiz);
1306                 strncpy(buf,alias,bufsiz - 1);
1307                 retVal = 0;
1308         }
1309         yaffsfs_Unlock();
1310         return retVal;
1311 }
1312
1313 int yaffs_link(const char *oldpath, const char *newpath);
1314 int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
1315
1316 int yaffs_DumpDevStruct(const char *path)
1317 {
1318         char *rest;
1319
1320         yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
1321
1322         if(obj)
1323         {
1324                 yaffs_Device *dev = obj->myDev;
1325
1326                 printf("\n"
1327                            "nPageWrites.......... %d\n"
1328                            "nPageReads........... %d\n"
1329                            "nBlockErasures....... %d\n"
1330                            "nGCCopies............ %d\n"
1331                            "garbageCollections... %d\n"
1332                            "passiveGarbageColl'ns %d\n"
1333                            "\n",
1334                                 dev->nPageWrites,
1335                                 dev->nPageReads,
1336                                 dev->nBlockErasures,
1337                                 dev->nGCCopies,
1338                                 dev->garbageCollections,
1339                                 dev->passiveGarbageCollections
1340                 );
1341         }
1342 }
1343