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 1.4 2003-02-24 23:49:29 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                 if(obj && !openDenied)
 446                 {
 447                         h->obj = obj;
 448                         h->inUse = 1;
 449                 h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1;
 450                         h->append =  (oflag & O_APPEND) ? 1 : 0;
 451                         h->exclusive = (oflag & O_EXCL) ? 1 : 0;
 452                         h->position = 0;
 453
 454                         obj->inUse++;
 455                         if((oflag & O_TRUNC) && !h->readOnly)
 456                         {
 457                                 //todo truncate
 458                                 yaffs_ResizeFile(obj,0);
 459                         }
 460
 461                 }
 462                 else
 463                 {
 464                         yaffsfs_PutHandle(handle);
 465                         if(!errorReported)
 466                         {
 467                                 yaffsfs_SetError(-EACCESS);
 468                                 errorReported = 1;
 469                         }
 470                         handle = -1;
 471                 }
 472
 473         }
 474
 475         yaffsfs_Unlock();
 476
 477         return handle;
 478 }
 479
 480 int yaffs_close(int fd)
 481 {
 482         yaffsfs_Handle *h = NULL;
 483         int retVal = 0;
 484
 485         yaffsfs_Lock();
 486
 487         h = yaffsfs_GetHandlePointer(fd);
 488
 489         if(h && h->inUse)
 490         {
 491                 // clean up
 492                 yaffs_FlushFile(h->obj,1);
 493                 h->obj->inUse--;
 494                 if(h->obj->inUse <= 0 && h->obj->unlinked)
 495                 {
 496                         yaffs_DeleteFile(h->obj);
 497                 }
 498                 yaffsfs_PutHandle(fd);
 499                 retVal = 0;
 500         }
 501         else
 502         {
 503                 // bad handle
 504                 yaffsfs_SetError(-EBADF);
 505                 retVal = -1;
 506         }
 507
 508         yaffsfs_Unlock();
 509
 510         return retVal;
 511 }
 512
 513 int yaffs_read(int fd, void *buf, unsigned int nbyte)
 514 {
 515         yaffsfs_Handle *h = NULL;
 516         yaffs_Object *obj = NULL;
 517         int pos = 0;
 518         int nRead = -1;
 519         int maxRead;
 520
 521         yaffsfs_Lock();
 522         h = yaffsfs_GetHandlePointer(fd);
 523         obj = yaffsfs_GetHandleObject(fd);
 524
 525         if(!h || !obj)
 526         {
 527                 // bad handle
 528                 yaffsfs_SetError(-EBADF);
 529         }
 530         else if( h && obj)
 531         {
 532                 pos=  h->position;
 533                 if(yaffs_GetObjectFileLength(obj) > pos)
 534                 {
 535                         maxRead = yaffs_GetObjectFileLength(obj) - pos;
 536                 }
 537                 else
 538                 {
 539                         maxRead = 0;
 540                 }
 541
 542                 if(nbyte > maxRead)
 543                 {
 544                         nbyte = maxRead;
 545                 }
 546
 547
 548                 if(nbyte > 0)
 549                 {
 550                         nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte);
 551                         if(nRead >= 0)
 552                         {
 553                                 h->position = pos + nRead;
 554                         }
 555                         else
 556                         {
 557                                 //todo error
 558                         }
 559                 }
 560                 else
 561                 {
 562                         nRead = 0;
 563                 }
 564
 565         }
 566
 567         yaffsfs_Unlock();
 568
 569
 570         return (nRead >= 0) ? nRead : -1;
 571
 572 }
 573
 574 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
 575 {
 576         yaffsfs_Handle *h = NULL;
 577         yaffs_Object *obj = NULL;
 578         int pos = 0;
 579         int nWritten = -1;
 580
 581         yaffsfs_Lock();
 582         h = yaffsfs_GetHandlePointer(fd);
 583         obj = yaffsfs_GetHandleObject(fd);
 584
 585         if(!h || !obj)
 586         {
 587                 // bad handle
 588                 yaffsfs_SetError(-EBADF);
 589         }
 590         else if( h && obj && h->readOnly)
 591         {
 592                 // todo error
 593         }
 594         else if( h && obj)
 595         {
 596                 if(h->append)
 597                 {
 598                         pos =  yaffs_GetObjectFileLength(obj);
 599                 }
 600                 else
 601                 {
 602                         pos = h->position;
 603                 }
 604
 605                 nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte);
 606
 607                 if(nWritten >= 0)
 608                 {
 609                         h->position = pos + nWritten;
 610                 }
 611                 else
 612                 {
 613                         //todo error
 614                 }
 615
 616         }
 617
 618         yaffsfs_Unlock();
 619
 620
 621         return (nWritten >= 0) ? nWritten : -1;
 622
 623 }
 624
 625 off_t yaffs_lseek(int fd, off_t offset, int whence)
 626 {
 627         yaffsfs_Handle *h = NULL;
 628         yaffs_Object *obj = NULL;
 629         int pos = -1;
 630         int fSize = -1;
 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 if(whence == SEEK_SET)
 642         {
 643                 if(offset >= 0)
 644                 {
 645                         pos = offset;
 646                 }
 647         }
 648         else if(whence == SEEK_CUR)
 649         {
 650                 if( (h->position + offset) >= 0)
 651                 {
 652                         pos = (h->position + offset);
 653                 }
 654         }
 655         else if(whence == SEEK_END)
 656         {
 657                 fSize = yaffs_GetObjectFileLength(obj);
 658                 if(fSize >= 0 && (fSize + offset) >= 0)
 659                 {
 660                         pos = fSize + offset;
 661                 }
 662         }
 663
 664         if(pos >= 0)
 665         {
 666                 h->position = pos;
 667         }
 668         else
 669         {
 670                 // todo error
 671         }
 672
 673
 674         yaffsfs_Unlock();
 675
 676         return pos;
 677 }
 678
 679
 680 int yaffsfs_DoUnlink(const char *path,int isDirectory)
 681 {
 682         yaffs_Object *dir = NULL;
 683         yaffs_Object *obj = NULL;
 684         char *name;
 685         int result = YAFFS_FAIL;
 686
 687         yaffsfs_Lock();
 688
 689         obj = yaffsfs_FindObject(NULL,path,0);
 690         dir = yaffsfs_FindDirectory(NULL,path,&name,0);
 691         if(!dir)
 692         {
 693                 yaffsfs_SetError(-ENOTDIR);
 694         }
 695         else if(!obj)
 696         {
 697                 yaffsfs_SetError(-ENOENT);
 698         }
 699         else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
 700         {
 701                 yaffsfs_SetError(-EISDIR);
 702         }
 703         else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 704         {
 705                 yaffsfs_SetError(-ENOTDIR);
 706         }
 707         else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 708         {
 709                 yaffsfs_SetError(-ENOTDIR);
 710         }
 711         else
 712         {
 713                 result = yaffs_Unlink(dir,name);
 714
 715                 if(result == YAFFS_FAIL && isDirectory)
 716                 {
 717                         yaffsfs_SetError(-ENOTEMPTY);
 718                 }
 719         }
 720
 721         yaffsfs_Unlock();
 722
 723         // todo error
 724
 725         return (result == YAFFS_FAIL) ? -1 : 0;
 726 }
 727 int yaffs_rmdir(const char *path)
 728 {
 729         return yaffsfs_DoUnlink(path,1);
 730 }
 731
 732 int yaffs_unlink(const char *path)
 733 {
 734         return yaffsfs_DoUnlink(path,0);
 735 }
 736
 737 int yaffs_rename(const char *oldPath, const char *newPath)
 738 {
 739         yaffs_Object *olddir = NULL;
 740         yaffs_Object *newdir = NULL;
 741         char *oldname;
 742         char *newname;
 743         int result= YAFFS_FAIL;
 744
 745         yaffsfs_Lock();
 746
 747         olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
 748         newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
 749
 750         if(!olddir || !newdir)
 751         {
 752                 // bad handle
 753                 yaffsfs_SetError(-EBADF);
 754         }
 755         else if(olddir->myDev != newdir->myDev)
 756         {
 757                 // oops must be on same device
 758                 // todo error
 759                 yaffsfs_SetError(-EXDEV);
 760         }
 761         else
 762         {
 763                 result = yaffs_RenameObject(olddir,oldname,newdir,newname);
 764         }
 765
 766         yaffsfs_Unlock();
 767
 768         return (result == YAFFS_FAIL) ? -1 : 0;
 769 }
 770
 771
 772 static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
 773 {
 774         int retVal = -1;
 775
 776         if(obj)
 777         {
 778                 obj = yaffs_GetEquivalentObject(obj);
 779         }
 780
 781         if(obj && buf)
 782         {
 783         buf->st_dev = (int)obj->myDev->genericDevice;
 784         buf->st_ino = obj->objectId;
 785         buf->st_mode = obj->st_mode & ~S_IFMT; // clear out file type bits
 786
 787                 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
 788                 {
 789                         buf->st_mode |= S_IFDIR;
 790                 }
 791                 else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
 792                 {
 793                         buf->st_mode |= S_IFLNK;
 794                 }
 795                 else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
 796                 {
 797                         buf->st_mode |= S_IFREG;
 798                 }
 799
 800         buf->st_nlink = yaffs_GetObjectLinkCount(obj);
 801         buf->st_uid = 0;
 802         buf->st_gid = 0;;
 803         buf->st_rdev = obj->st_rdev;
 804         buf->st_size = yaffs_GetObjectFileLength(obj);
 805                 buf->st_blksize = YAFFS_BYTES_PER_CHUNK;
 806         buf->st_blocks = (buf->st_size + YAFFS_BYTES_PER_CHUNK -1)/YAFFS_BYTES_PER_CHUNK;
 807         buf->st_atime = obj->st_atime;
 808         buf->st_ctime = obj->st_ctime;
 809         buf->st_mtime = obj->st_mtime;
 810                 retVal = 0;
 811         }
 812         return retVal;
 813 }
 814
 815 static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int doLStat)
 816 {
 817         yaffs_Object *obj;
 818
 819         int retVal = -1;
 820
 821         yaffsfs_Lock();
 822         obj = yaffsfs_FindObject(NULL,path,0);
 823
 824         if(!doLStat && obj)
 825         {
 826                 obj = yaffsfs_FollowLink(obj,0);
 827         }
 828
 829         if(obj)
 830         {
 831                 retVal = yaffsfs_DoStat(obj,buf);
 832         }
 833         else
 834         {
 835                 // todo error not found
 836                 yaffsfs_SetError(-ENOENT);
 837         }
 838
 839         yaffsfs_Unlock();
 840
 841         return retVal;
 842
 843 }
 844
 845 int yaffs_stat(const char *path, struct yaffs_stat *buf)
 846 {
 847         return yaffsfs_DoStatOrLStat(path,buf,0);
 848 }
 849
 850 int yaffs_lstat(const char *path, struct yaffs_stat *buf)
 851 {
 852         return yaffsfs_DoStatOrLStat(path,buf,1);
 853 }
 854
 855 int yaffs_fstat(int fd, struct yaffs_stat *buf)
 856 {
 857         yaffs_Object *obj;
 858
 859         int retVal = -1;
 860
 861         yaffsfs_Lock();
 862         obj = yaffsfs_GetHandleObject(fd);
 863
 864         if(obj)
 865         {
 866                 retVal = yaffsfs_DoStat(obj,buf);
 867         }
 868         else
 869         {
 870                 // bad handle
 871                 yaffsfs_SetError(-EBADF);
 872         }
 873
 874         yaffsfs_Unlock();
 875
 876         return retVal;
 877 }
 878
 879 static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
 880 {
 881         int result;
 882
 883         if(obj)
 884         {
 885                 obj = yaffs_GetEquivalentObject(obj);
 886         }
 887
 888         if(obj)
 889         {
 890                 obj->st_mode = mode;
 891                 obj->dirty = 1;
 892                 result = yaffs_FlushFile(obj,0);
 893         }
 894
 895         return result == YAFFS_OK ? 0 : -1;
 896 }
 897
 898
 899 int yaffs_chmod(const char *path, mode_t mode)
 900 {
 901         yaffs_Object *obj;
 902
 903         int retVal = -1;
 904
 905         yaffsfs_Lock();
 906         obj = yaffsfs_FindObject(NULL,path,0);
 907
 908         if(obj)
 909         {
 910                 retVal = yaffsfs_DoChMod(obj,mode);
 911         }
 912         else
 913         {
 914                 // todo error not found
 915                 yaffsfs_SetError(-ENOENT);
 916         }
 917
 918         yaffsfs_Unlock();
 919
 920         return retVal;
 921
 922 }
 923
 924
 925 int yaffs_fchmod(int fd, mode_t mode)
 926 {
 927         yaffs_Object *obj;
 928
 929         int retVal = -1;
 930
 931         yaffsfs_Lock();
 932         obj = yaffsfs_GetHandleObject(fd);
 933
 934         if(obj)
 935         {
 936                 retVal = yaffsfs_DoChMod(obj,mode);
 937         }
 938         else
 939         {
 940                 // bad handle
 941                 yaffsfs_SetError(-EBADF);
 942         }
 943
 944         yaffsfs_Unlock();
 945
 946         return retVal;
 947 }
 948
 949
 950 int yaffs_mkdir(const char *path, mode_t mode)
 951 {
 952         yaffs_Object *parent = NULL;
 953         yaffs_Object *dir;
 954         char *name;
 955         int retVal= -1;
 956
 957         yaffsfs_Lock();
 958         parent = yaffsfs_FindDirectory(NULL,path,&name,0);
 959         dir = yaffs_MknodDirectory(parent,name,mode,0,0);
 960         if(dir)
 961         {
 962                 retVal = 0;
 963         }
 964         else
 965         {
 966                 yaffsfs_SetError(-ENOSPC); // just assume no space for now
 967                 retVal = -1;
 968         }
 969
 970         yaffsfs_Unlock();
 971
 972         return retVal;
 973 }
 974
 975 int yaffs_mount(const char *path)
 976 {
 977         int retVal=-1;
 978         int result=YAFFS_FAIL;
 979         yaffs_Device *dev=NULL;
 980         char *dummy;
 981
 982         yaffsfs_Lock();
 983         dev = yaffsfs_FindDevice(path,&dummy);
 984         if(dev)
 985         {
 986                 if(!dev->isMounted)
 987                 {
 988                         result = yaffs_GutsInitialise(dev);
 989                         if(result == YAFFS_FAIL)
 990                         {
 991                                 // todo error - mount failed
 992                                 yaffsfs_SetError(-ENOMEM);
 993                         }
 994                         retVal = result ? 0 : -1;
 995
 996                 }
 997                 else
 998                 {
 999                         //todo error - already mounted.
1000                         yaffsfs_SetError(-EBUSY);
1001                 }
1002         }
1003         else
1004         {
1005                 // todo error - no device
1006                 yaffsfs_SetError(-ENODEV);
1007         }
1008         yaffsfs_Unlock();
1009         return retVal;
1010
1011 }
1012
1013 int yaffs_unmount(const char *path)
1014 {
1015         int retVal=-1;
1016         yaffs_Device *dev=NULL;
1017         char *dummy;
1018
1019         yaffsfs_Lock();
1020         dev = yaffsfs_FindDevice(path,&dummy);
1021         if(dev)
1022         {
1023                 if(dev->isMounted)
1024                 {
1025                         int i;
1026                         int inUse;
1027                         for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++)
1028                         {
1029                                 if(yaffsfs_handle[i].inUse && yaffsfs_handle[i].obj->myDev == dev)
1030                                 {
1031                                         inUse = 1; // the device is in use, can't unmount
1032                                 }
1033                         }
1034
1035                         if(!inUse)
1036                         {
1037                                 yaffs_Deinitialise(dev);
1038
1039                                 retVal = 0;
1040                         }
1041                         else
1042                         {
1043                                 // todo error can't unmount as files are open
1044                                 yaffsfs_SetError(-EBUSY);
1045                         }
1046
1047                 }
1048                 else
1049                 {
1050                         //todo error - not mounted.
1051                         yaffsfs_SetError(-EINVAL);
1052
1053                 }
1054         }
1055         else
1056         {
1057                 // todo error - no device
1058                 yaffsfs_SetError(-ENODEV);
1059         }
1060         yaffsfs_Unlock();
1061         return retVal;
1062
1063 }
1064
1065 off_t yaffs_freespace(const char *path)
1066 {
1067         off_t retVal=-1;
1068         yaffs_Device *dev=NULL;
1069         char *dummy;
1070
1071         yaffsfs_Lock();
1072         dev = yaffsfs_FindDevice(path,&dummy);
1073         if(dev)
1074         {
1075                 retVal = yaffs_GetNumberOfFreeChunks(dev);
1076                 retVal *= YAFFS_BYTES_PER_CHUNK;
1077
1078         }
1079         else
1080         {
1081                 yaffsfs_SetError(-EINVAL);
1082         }
1083
1084         yaffsfs_Unlock();
1085         return retVal;
1086 }
1087
1088 void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList)
1089 {
1090
1091         yaffsfs_DeviceConfiguration *cfg;
1092
1093         yaffsfs_configurationList = cfgList;
1094
1095         yaffsfs_InitHandles();
1096
1097         cfg = yaffsfs_configurationList;
1098
1099         while(cfg && cfg->prefix && cfg->dev)
1100         {
1101                 cfg->dev->isMounted = 0;
1102                 cfg++;
1103         }
1104
1105
1106 }
1107
1108
1109 //
1110 // Directory search stuff.
1111
1112 yaffs_DIR *yaffs_opendir(const char *dirname)
1113 {
1114         yaffs_DIR *dir = NULL;
1115         yaffs_Object *obj = NULL;
1116         yaffsfs_DirectorySearchContext *dsc = NULL;
1117
1118         yaffsfs_Lock();
1119
1120         obj = yaffsfs_FindObject(NULL,dirname,0);
1121
1122         if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1123         {
1124
1125                 dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
1126                 dir = (yaffs_DIR *)dsc;
1127                 if(dsc)
1128                 {
1129                         dsc->magic = YAFFS_MAGIC;
1130                         dsc->list = NULL;
1131                         memset(dsc->name,0,NAME_MAX+1);
1132                         strncpy(dsc->name,dirname,NAME_MAX);
1133                 }
1134
1135         }
1136
1137         yaffsfs_Unlock();
1138
1139         return dir;
1140 }
1141
1142 struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
1143 {
1144         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1145         struct yaffs_dirent *retVal = NULL;
1146         struct list_head *i;
1147         yaffs_Object *entry = NULL;
1148         int offset;
1149         yaffs_Object *obj = NULL;
1150         struct yaffsfs_ObjectListEntry *list = NULL;
1151         int inList = 0;
1152
1153         yaffsfs_Lock();
1154
1155         offset = -1;
1156
1157         if(dsc && dsc->magic == YAFFS_MAGIC)
1158         {
1159                 yaffsfs_SetError(0);
1160
1161                 obj = yaffsfs_FindObject(NULL,dsc->name,0);
1162
1163                 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1164                 {
1165
1166                         list_for_each(i,&obj->variant.directoryVariant.children)
1167                         {
1168                                         offset++;
1169                                         entry = (i) ?  list_entry(i, yaffs_Object,siblings) : NULL;
1170
1171                                         if(entry)
1172                                         {
1173                                                 list = dsc->list;
1174                                                 inList = 0;
1175                                                 while(list && !inList)
1176                                                 {
1177                                                         if(list->objectId == entry->objectId)
1178                                                         {
1179                                                                 inList = 1;
1180                                                         }
1181                                                         list = list->next;
1182                                                 }
1183
1184                                                 if(!inList) goto foundNew;
1185                                         }
1186
1187                         }
1188
1189                         foundNew:
1190
1191                         if(!inList && entry)
1192                         {
1193                                 //This is the entry we're going to return;
1194                                 struct yaffsfs_ObjectListEntry *le;
1195
1196                                 le = YMALLOC(sizeof(struct yaffsfs_ObjectListEntry));
1197
1198                                 if(le)
1199                                 {
1200                                         le->next =  dsc->list;
1201                                         le->objectId = entry->objectId;
1202                                         dsc->list = le;
1203
1204                                         dsc->de.d_ino = yaffs_GetEquivalentObject(entry)->objectId;
1205                                         dsc->de.d_off = offset;
1206                                         yaffs_GetObjectName(entry,dsc->de.d_name,NAME_MAX+1);
1207                                         dsc->de.d_reclen = sizeof(struct yaffs_dirent);
1208
1209                                         retVal = &dsc->de;
1210                                 }
1211
1212                         }
1213                 }
1214
1215         }
1216         else
1217         {
1218                 yaffsfs_SetError(-EBADF);
1219         }
1220
1221         yaffsfs_Unlock();
1222
1223         return retVal;
1224
1225 }
1226
1227 void yaffsfs_ListClear(yaffsfs_DirectorySearchContext *dsc)
1228 {
1229
1230         struct yaffsfs_ObjectListEntry *le;
1231
1232         if(dsc && dsc->magic == YAFFS_MAGIC)
1233         {
1234                 while(dsc->list)
1235                 {
1236                         le = dsc->list;
1237                         dsc->list = dsc->list->next;
1238                         YFREE(le);
1239                 }
1240         }
1241
1242 }
1243
1244 void yaffs_rewinddir(yaffs_DIR *dirp)
1245 {
1246         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1247
1248         yaffsfs_Lock();
1249         yaffsfs_ListClear(dsc);
1250         yaffsfs_Unlock();
1251 }
1252
1253
1254 int yaffs_closedir(yaffs_DIR *dirp)
1255 {
1256         yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
1257
1258         yaffsfs_Lock();
1259         yaffsfs_ListClear(dsc);
1260         dsc->magic = 0;
1261         YFREE(dsc);
1262         yaffsfs_Unlock();
1263         return 0;
1264 }
1265
1266
1267
1268 int yaffs_symlink(const char *oldpath, const char *newpath)
1269 {
1270         yaffs_Object *parent = NULL;
1271         yaffs_Object *obj;
1272         char *name;
1273         int retVal= -1;
1274         int mode = 0; // ignore for now
1275
1276         yaffsfs_Lock();
1277         parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
1278         obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
1279         if(obj)
1280         {
1281                 retVal = 0;
1282         }
1283         else
1284         {
1285                 yaffsfs_SetError(-ENOSPC); // just assume no space for now
1286                 retVal = -1;
1287         }
1288
1289         yaffsfs_Unlock();
1290
1291         return retVal;
1292
1293 }
1294
1295 int yaffs_readlink(const char *path, char *buf, int bufsiz)
1296 {
1297         yaffs_Object *obj = NULL;
1298         int retVal;
1299
1300
1301         yaffsfs_Lock();
1302
1303         obj = yaffsfs_FindObject(NULL,path,0);
1304
1305         if(!obj)
1306         {
1307                 yaffsfs_SetError(-ENOENT);
1308                 retVal = -1;
1309         }
1310         else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK)
1311         {
1312                 yaffsfs_SetError(-EINVAL);
1313                 retVal = -1;
1314         }
1315         else
1316         {
1317                 char *alias = obj->variant.symLinkVariant.alias;
1318                 memset(buf,0,bufsiz);
1319                 strncpy(buf,alias,bufsiz - 1);
1320                 retVal = 0;
1321         }
1322         yaffsfs_Unlock();
1323         return retVal;
1324 }
1325
1326 int yaffs_link(const char *oldpath, const char *newpath);
1327 int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
1328
1329 int yaffs_DumpDevStruct(const char *path)
1330 {
1331         char *rest;
1332
1333         yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
1334
1335         if(obj)
1336         {
1337                 yaffs_Device *dev = obj->myDev;
1338
1339                 printf("\n"
1340                            "nPageWrites.......... %d\n"
1341                            "nPageReads........... %d\n"
1342                            "nBlockErasures....... %d\n"
1343                            "nGCCopies............ %d\n"
1344                            "garbageCollections... %d\n"
1345                            "passiveGarbageColl'ns %d\n"
1346                            "\n",
1347                                 dev->nPageWrites,
1348                                 dev->nPageReads,
1349                                 dev->nBlockErasures,
1350                                 dev->nGCCopies,
1351                                 dev->garbageCollections,
1352                                 dev->passiveGarbageCollections
1353                 );
1354         }
1355         return 0;
1356 }
1357