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 1.1 2004-11-03 08:29:28 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 int yaffs_truncate(int fd, unsigned int newSize)
 627 {
 628         yaffsfs_Handle *h = NULL;
 629         yaffs_Object *obj = NULL;
 630         int result = 0;
 631
 632         yaffsfs_Lock();
 633         h = yaffsfs_GetHandlePointer(fd);
 634         obj = yaffsfs_GetHandleObject(fd);
 635
 636         if(!h || !obj)
 637         {
 638                 // bad handle
 639                 yaffsfs_SetError(-EBADF);
 640         }
 641         else
 642         {
 643                 // resize the file
 644                 result = yaffs_ResizeFile(obj,newSize);
 645         }
 646         yaffsfs_Unlock();
 647
 648
 649         return (result) ? 0 : -1;
 650
 651 }
 652
 653 off_t yaffs_lseek(int fd, off_t offset, int whence)
 654 {
 655         yaffsfs_Handle *h = NULL;
 656         yaffs_Object *obj = NULL;
 657         int pos = -1;
 658         int fSize = -1;
 659
 660         yaffsfs_Lock();
 661         h = yaffsfs_GetHandlePointer(fd);
 662         obj = yaffsfs_GetHandleObject(fd);
 663
 664         if(!h || !obj)
 665         {
 666                 // bad handle
 667                 yaffsfs_SetError(-EBADF);
 668         }
 669         else if(whence == SEEK_SET)
 670         {
 671                 if(offset >= 0)
 672                 {
 673                         pos = offset;
 674                 }
 675         }
 676         else if(whence == SEEK_CUR)
 677         {
 678                 if( (h->position + offset) >= 0)
 679                 {
 680                         pos = (h->position + offset);
 681                 }
 682         }
 683         else if(whence == SEEK_END)
 684         {
 685                 fSize = yaffs_GetObjectFileLength(obj);
 686                 if(fSize >= 0 && (fSize + offset) >= 0)
 687                 {
 688                         pos = fSize + offset;
 689                 }
 690         }
 691
 692         if(pos >= 0)
 693         {
 694                 h->position = pos;
 695         }
 696         else
 697         {
 698                 // todo error
 699         }
 700
 701
 702         yaffsfs_Unlock();
 703
 704         return pos;
 705 }
 706
 707
 708 int yaffsfs_DoUnlink(const char *path,int isDirectory)
 709 {
 710         yaffs_Object *dir = NULL;
 711         yaffs_Object *obj = NULL;
 712         char *name;
 713         int result = YAFFS_FAIL;
 714
 715         yaffsfs_Lock();
 716
 717         obj = yaffsfs_FindObject(NULL,path,0);
 718         dir = yaffsfs_FindDirectory(NULL,path,&name,0);
 719         if(!dir)
 720         {
 721                 yaffsfs_SetError(-ENOTDIR);
 722         }
 723         else if(!obj)
 724         {
 725                 yaffsfs_SetError(-ENOENT);
 726         }
 727         else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
 728         {
 729                 yaffsfs_SetError(-EISDIR);
 730         }
 731         else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 732         {
 733                 yaffsfs_SetError(-ENOTDIR);
 734         }
 735         else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 736         {
 737                 yaffsfs_SetError(-ENOTDIR);
 738         }
 739         else
 740         {
 741                 result = yaffs_Unlink(dir,name);
 742
 743                 if(result == YAFFS_FAIL && isDirectory)
 744                 {
 745                         yaffsfs_SetError(-ENOTEMPTY);
 746                 }
 747         }
 748
 749         yaffsfs_Unlock();
 750
 751         // todo error
 752
 753         return (result == YAFFS_FAIL) ? -1 : 0;
 754 }
 755 int yaffs_rmdir(const char *path)
 756 {
 757         return yaffsfs_DoUnlink(path,1);
 758 }
 759
 760 int yaffs_unlink(const char *path)
 761 {
 762         return yaffsfs_DoUnlink(path,0);
 763 }
 764
 765 int yaffs_rename(const char *oldPath, const char *newPath)
 766 {
 767         yaffs_Object *olddir = NULL;
 768         yaffs_Object *newdir = NULL;
 769         yaffs_Object *obj = NULL;
 770         char *oldname;
 771         char *newname;
 772         int result= YAFFS_FAIL;
 773         int renameAllowed = 1;
 774
 775         yaffsfs_Lock();
 776
 777         olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
 778         newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
 779         obj = yaffsfs_FindObject(NULL,oldPath,0);
 780
 781         if(!olddir || !newdir || !obj)
 782         {
 783                 // bad file
 784                 yaffsfs_SetError(-EBADF);
 785                 renameAllowed = 0;
 786         }
 787         else if(olddir->myDev != newdir->myDev)
 788         {
 789                 // oops must be on same device
 790                 // todo error
 791                 yaffsfs_SetError(-EXDEV);
 792                 renameAllowed = 0;
 793         }
 794         else if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
 795         {
 796                 // It is a directory, check that it is not being renamed to
 797                 // being its own decendent.
 798                 // Do this by tracing from the new directory back to the root, checking for obj
 799
 800                 yaffs_Object *xx = newdir;
 801
 802                 while( renameAllowed && xx)
 803                 {
 804                         if(xx == obj)
 805                         {
 806                                 renameAllowed = 0;
 807                         }
 808                         xx = xx->parent;
 809                 }
 810                 if(!renameAllowed) yaffsfs_SetError(-EACCESS);
 811         }
 812
 813         if(renameAllowed)
 814         {
 815                 result = yaffs_RenameObject(olddir,oldname,newdir,newname);
 816         }
 817
 818         yaffsfs_Unlock();
 819
 820         return (result == YAFFS_FAIL) ? -1 : 0;
 821 }
 822
 823
 824 static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
 825 {
 826         int retVal = -1;
 827
 828         if(obj)
 829         {
 830                 obj = yaffs_GetEquivalentObject(obj);
 831         }
 832
 833         if(obj && buf)
 834         {
 835         buf->st_dev = (int)obj->myDev->genericDevice;
 836         buf->st_ino = obj->objectId;
 837         buf->st_mode = obj->st_mode & ~S_IFMT; // clear out file type bits
 838
 839                 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
 840                 {
 841                         buf->st_mode |= S_IFDIR;
 842                 }
 843                 else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
 844                 {
 845                         buf->st_mode |= S_IFLNK;
 846                 }
 847                 else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
 848                 {
 849                         buf->st_mode |= S_IFREG;
 850                 }
 851
 852         buf->st_nlink = yaffs_GetObjectLinkCount(obj);
 853         buf->st_uid = 0;
 854         buf->st_gid = 0;;
 855         buf->st_rdev = obj->st_rdev;
 856         buf->st_size = yaffs_GetObjectFileLength(obj);
 857                 buf->st_blksize = obj->myDev->nBytesPerChunk;
 858         buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
 859         buf->st_atime = obj->st_atime;
 860         buf->st_ctime = obj->st_ctime;
 861         buf->st_mtime = obj->st_mtime;
 862                 retVal = 0;
 863         }
 864         return retVal;
 865 }
 866
 867 static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int doLStat)
 868 {
 869         yaffs_Object *obj;
 870
 871         int retVal = -1;
 872
 873         yaffsfs_Lock();
 874         obj = yaffsfs_FindObject(NULL,path,0);
 875
 876         if(!doLStat && obj)
 877         {
 878                 obj = yaffsfs_FollowLink(obj,0);
 879         }
 880
 881         if(obj)
 882         {
 883                 retVal = yaffsfs_DoStat(obj,buf);
 884         }
 885         else
 886         {
 887                 // todo error not found
 888                 yaffsfs_SetError(-ENOENT);
 889         }
 890
 891         yaffsfs_Unlock();
 892
 893         return retVal;
 894
 895 }
 896
 897 int yaffs_stat(const char *path, struct yaffs_stat *buf)
 898 {
 899         return yaffsfs_DoStatOrLStat(path,buf,0);
 900 }
 901
 902 int yaffs_lstat(const char *path, struct yaffs_stat *buf)
 903 {
 904         return yaffsfs_DoStatOrLStat(path,buf,1);
 905 }
 906
 907 int yaffs_fstat(int fd, struct yaffs_stat *buf)
 908 {
 909         yaffs_Object *obj;
 910
 911         int retVal = -1;
 912
 913         yaffsfs_Lock();
 914         obj = yaffsfs_GetHandleObject(fd);
 915
 916         if(obj)
 917         {
 918                 retVal = yaffsfs_DoStat(obj,buf);
 919         }
 920         else
 921         {
 922                 // bad handle
 923                 yaffsfs_SetError(-EBADF);
 924         }
 925
 926         yaffsfs_Unlock();
 927
 928         return retVal;
 929 }
 930
 931 static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
 932 {
 933         int result;
 934
 935         if(obj)
 936         {
 937                 obj = yaffs_GetEquivalentObject(obj);
 938         }
 939
 940         if(obj)
 941         {
 942                 obj->st_mode = mode;
 943                 obj->dirty = 1;
 944                 result = yaffs_FlushFile(obj,0);
 945         }
 946
 947         return result == YAFFS_OK ? 0 : -1;
 948 }
 949
 950
 951 int yaffs_chmod(const char *path, mode_t mode)
 952 {
 953         yaffs_Object *obj;
 954
 955         int retVal = -1;
 956
 957         yaffsfs_Lock();
 958         obj = yaffsfs_FindObject(NULL,path,0);
 959
 960         if(obj)
 961         {
 962                 retVal = yaffsfs_DoChMod(obj,mode);
 963         }
 964         else
 965         {
 966                 // todo error not found
 967                 yaffsfs_SetError(-ENOENT);
 968         }
 969
 970         yaffsfs_Unlock();
 971
 972         return retVal;
 973
 974 }
 975
 976
 977 int yaffs_fchmod(int fd, mode_t mode)
 978 {
 979         yaffs_Object *obj;
 980
 981         int retVal = -1;
 982
 983         yaffsfs_Lock();
 984         obj = yaffsfs_GetHandleObject(fd);
 985
 986         if(obj)
 987         {
 988                 retVal = yaffsfs_DoChMod(obj,mode);
 989         }
 990         else
 991         {
 992                 // bad handle
 993                 yaffsfs_SetError(-EBADF);
 994         }
 995
 996         yaffsfs_Unlock();
 997
 998         return retVal;
 999 }
1000
1001
1002 int yaffs_mkdir(const char *path, mode_t mode)
1003 {
1004         yaffs_Object *parent = NULL;
1005         yaffs_Object *dir;
1006         char *name;
1007         int retVal= -1;
1008
1009         yaffsfs_Lock();
1010         parent = yaffsfs_FindDirectory(NULL,path,&name,0);
1011         dir = yaffs_MknodDirectory(parent,name,mode,0,0);
1012         if(dir)
1013         {
1014                 retVal = 0;
1015         }
1016         else
1017         {
1018                 yaffsfs_SetError(-ENOSPC); // just assume no space for now
1019                 retVal = -1;
1020         }
1021
1022         yaffsfs_Unlock();
1023
1024         return retVal;
1025 }
1026
1027 int yaffs_mount(const char *path)
1028 {
1029         int retVal=-1;
1030         int result=YAFFS_FAIL;
1031         yaffs_Device *dev=NULL;
1032         char *dummy;
1033
1034         T(YAFFS_TRACE_ALWAYS,("yaffs: Mounting %s\n",path));
1035
1036         yaffsfs_Lock();
1037         dev = yaffsfs_FindDevice(path,&dummy);
1038         if(dev)
1039         {
1040                 if(!dev->isMounted)
1041                 {
1042                         result = yaffs_GutsInitialise(dev);
1043                         if(result == YAFFS_FAIL)
1044                         {
1045                                 // todo error - mount failed
1046                                 yaffsfs_SetError(-ENOMEM);
1047                         }
1048                         retVal = result ? 0 : -1;
1049
1050                 }
1051                 else
1052                 {
1053                         //todo error - already mounted.
1054                         yaffsfs_SetError(-EBUSY);
1055                 }
1056         }
1057         else
1058         {
1059                 // todo error - no device
1060                 yaffsfs_SetError(-ENODEV);
1061         }
1062         yaffsfs_Unlock();
1063         return retVal;
1064
1065 }
1066
1067 int yaffs_unmount(const char *path)
1068 {
1069         int retVal=-1;
1070         yaffs_Device *dev=NULL;
1071         char *dummy;
1072
1073         yaffsfs_Lock();
1074         dev = yaffsfs_FindDevice(path,&dummy);
1075         if(dev)
1076         {
1077                 if(dev->isMounted)
1078                 {
1079                         int i;
1080                         int inUse;
1081                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++)
1082                         {
1083                                 if(yaffsfs_handle[i].inUse && yaffsfs_handle[i].obj->myDev == dev)
1084                                 {
1085                                         inUse = 1; // the device is in use, can't unmount
1086                                 }
1087                         }
1088
1089                         if(!inUse)
1090                         {
1091                                 yaffs_Deinitialise(dev);
1092
1093                                 retVal = 0;
1094                         }
1095                         else
1096                         {
1097                                 // todo error can't unmount as files are open
1098                                 yaffsfs_SetError(-EBUSY);
1099                         }
1100
1101                 }
1102                 else
1103                 {
1104                         //todo error - not mounted.
1105                         yaffsfs_SetError(-EINVAL);
1106
1107                 }
1108         }
1109         else
1110         {
1111                 // todo error - no device
1112                 yaffsfs_SetError(-ENODEV);
1113         }
1114         yaffsfs_Unlock();
1115         return retVal;
1116
1117 }
1118
1119 off_t yaffs_freespace(const char *path)
1120 {
1121         off_t retVal=-1;
1122         yaffs_Device *dev=NULL;
1123         char *dummy;
1124
1125         yaffsfs_Lock();
1126         dev = yaffsfs_FindDevice(path,&dummy);
1127         if(dev)
1128         {
1129                 retVal = yaffs_GetNumberOfFreeChunks(dev);
1130                 retVal *= dev->nBytesPerChunk;
1131
1132         }
1133         else
1134         {
1135                 yaffsfs_SetError(-EINVAL);
1136         }
1137
1138         yaffsfs_Unlock();
1139         return retVal;
1140 }
1141
1142 void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList)
1143 {
1144
1145         yaffsfs_DeviceConfiguration *cfg;
1146
1147         yaffsfs_configurationList = cfgList;
1148
1149         yaffsfs_InitHandles();
1150
1151         cfg = yaffsfs_configurationList;
1152
1153         while(cfg && cfg->prefix && cfg->dev)
1154         {
1155                 cfg->dev->isMounted = 0;
1156                 cfg++;
1157         }
1158
1159
1160 }
1161
1162
1163 //
1164 // Directory search stuff.
1165
1166 yaffs_DIR *yaffs_opendir(const char *dirname)
1167 {
1168         yaffs_DIR *dir = NULL;
1169         yaffs_Object *obj = NULL;
1170         yaffsfs_DirectorySearchContext *dsc = NULL;
1171
1172         yaffsfs_Lock();
1173
1174         obj = yaffsfs_FindObject(NULL,dirname,0);
1175
1176         if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1177         {
1178
1179                 dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
1180                 dir = (yaffs_DIR *)dsc;
1181                 if(dsc)
1182                 {
1183                         dsc->magic = YAFFS_MAGIC;
1184                         dsc->list = NULL;
1185                         memset(dsc->name,0,NAME_MAX+1);
1186                         strncpy(dsc->name,dirname,NAME_MAX);
1187                 }
1188
1189         }
1190
1191         yaffsfs_Unlock();
1192
1193         return dir;
1194 }
1195
1196 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
1197 {
1198         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1199         struct yaffs_dirent *retVal = NULL;
1200         struct list_head *i;
1201         yaffs_Object *entry = NULL;
1202         int offset;
1203         yaffs_Object *obj = NULL;
1204         struct yaffsfs_ObjectListEntry *list = NULL;
1205         int inList = 0;
1206
1207         yaffsfs_Lock();
1208
1209         offset = -1;
1210
1211         if(dsc && dsc->magic == YAFFS_MAGIC)
1212         {
1213                 yaffsfs_SetError(0);
1214
1215                 obj = yaffsfs_FindObject(NULL,dsc->name,0);
1216
1217                 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1218                 {
1219
1220                         list_for_each(i,&obj->variant.directoryVariant.children)
1221                         {
1222                                         offset++;
1223                                         entry = (i) ?  list_entry(i, yaffs_Object,siblings) : NULL;
1224
1225                                         if(entry)
1226                                         {
1227                                                 list = dsc->list;
1228                                                 inList = 0;
1229                                                 while(list && !inList)
1230                                                 {
1231                                                         if(list->objectId == entry->objectId)
1232                                                         {
1233                                                                 inList = 1;
1234                                                         }
1235                                                         list = list->next;
1236                                                 }
1237
1238                                                 if(!inList) goto foundNew;
1239                                         }
1240
1241                         }
1242
1243                         foundNew:
1244
1245                         if(!inList && entry)
1246                         {
1247                                 //This is the entry we're going to return;
1248                                 struct yaffsfs_ObjectListEntry *le;
1249
1250                                 le = YMALLOC(sizeof(struct yaffsfs_ObjectListEntry));
1251
1252                                 if(le)
1253                                 {
1254                                         le->next =  dsc->list;
1255                                         le->objectId = entry->objectId;
1256                                         dsc->list = le;
1257
1258                                         dsc->de.d_ino = yaffs_GetEquivalentObject(entry)->objectId;
1259                                         dsc->de.d_off = offset;
1260                                         yaffs_GetObjectName(entry,dsc->de.d_name,NAME_MAX+1);
1261                                         dsc->de.d_reclen = sizeof(struct yaffs_dirent);
1262
1263                                         retVal = &dsc->de;
1264                                 }
1265
1266                         }
1267                 }
1268
1269         }
1270         else
1271         {
1272                 yaffsfs_SetError(-EBADF);
1273         }
1274
1275         yaffsfs_Unlock();
1276
1277         return retVal;
1278
1279 }
1280
1281 void yaffsfs_ListClear(yaffsfs_DirectorySearchContext *dsc)
1282 {
1283
1284         struct yaffsfs_ObjectListEntry *le;
1285
1286         if(dsc && dsc->magic == YAFFS_MAGIC)
1287         {
1288                 while(dsc->list)
1289                 {
1290                         le = dsc->list;
1291                         dsc->list = dsc->list->next;
1292                         YFREE(le);
1293                 }
1294         }
1295
1296 }
1297
1298 void yaffs_rewinddir(yaffs_DIR *dirp)
1299 {
1300         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1301
1302         yaffsfs_Lock();
1303         yaffsfs_ListClear(dsc);
1304         yaffsfs_Unlock();
1305 }
1306
1307
1308 int yaffs_closedir(yaffs_DIR *dirp)
1309 {
1310         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1311
1312         yaffsfs_Lock();
1313         yaffsfs_ListClear(dsc);
1314         dsc->magic = 0;
1315         YFREE(dsc);
1316         yaffsfs_Unlock();
1317         return 0;
1318 }
1319
1320
1321
1322 int yaffs_symlink(const char *oldpath, const char *newpath)
1323 {
1324         yaffs_Object *parent = NULL;
1325         yaffs_Object *obj;
1326         char *name;
1327         int retVal= -1;
1328         int mode = 0; // ignore for now
1329
1330         yaffsfs_Lock();
1331         parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
1332         obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
1333         if(obj)
1334         {
1335                 retVal = 0;
1336         }
1337         else
1338         {
1339                 yaffsfs_SetError(-ENOSPC); // just assume no space for now
1340                 retVal = -1;
1341         }
1342
1343         yaffsfs_Unlock();
1344
1345         return retVal;
1346
1347 }
1348
1349 int yaffs_readlink(const char *path, char *buf, int bufsiz)
1350 {
1351         yaffs_Object *obj = NULL;
1352         int retVal;
1353
1354
1355         yaffsfs_Lock();
1356
1357         obj = yaffsfs_FindObject(NULL,path,0);
1358
1359         if(!obj)
1360         {
1361                 yaffsfs_SetError(-ENOENT);
1362                 retVal = -1;
1363         }
1364         else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK)
1365         {
1366                 yaffsfs_SetError(-EINVAL);
1367                 retVal = -1;
1368         }
1369         else
1370         {
1371                 char *alias = obj->variant.symLinkVariant.alias;
1372                 memset(buf,0,bufsiz);
1373                 strncpy(buf,alias,bufsiz - 1);
1374                 retVal = 0;
1375         }
1376         yaffsfs_Unlock();
1377         return retVal;
1378 }
1379
1380 int yaffs_link(const char *oldpath, const char *newpath);
1381 int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
1382
1383 int yaffs_DumpDevStruct(const char *path)
1384 {
1385         char *rest;
1386
1387         yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
1388
1389         if(obj)
1390         {
1391                 yaffs_Device *dev = obj->myDev;
1392
1393                 printf("\n"
1394                            "nPageWrites.......... %d\n"
1395                            "nPageReads........... %d\n"
1396                            "nBlockErasures....... %d\n"
1397                            "nGCCopies............ %d\n"
1398                            "garbageCollections... %d\n"
1399                            "passiveGarbageColl'ns %d\n"
1400                            "\n",
1401                                 dev->nPageWrites,
1402                                 dev->nPageReads,
1403                                 dev->nBlockErasures,
1404                                 dev->nGCCopies,
1405                                 dev->garbageCollections,
1406                                 dev->passiveGarbageCollections
1407                 );
1408
1409         }
1410         return 0;
1411 }
1412