yaffs_fs.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  * yaffs_fs.c
   4  *
   5  * Copyright (C) 2002 Aleph One Ltd.
   6  *   for Toby Churchill Ltd and Brightstar Engineering
   7  *
   8  * Created by Charles Manning <charles@aleph1.co.uk>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * This is the file system front-end to YAFFS that hooks it up to
  15  * the VFS.
  16  *
  17  * Special notes:
  18  * >> sb->u.generic_sbp points to the yaffs_Device associated with this superblock
  19  * >> inode->u.generic_ip points to the associated yaffs_Object.
  20  *
  21  *
  22  * Acknowledgements:
  23  * * Luc van OostenRyck for numerous patches.
  24  * * Nick Bane for numerous patches.
  25  * * Andras Toth for mknod rdev issue.
  26  * * Some code bodily lifted from JFFS2.
  27  */
  28
  29
  30 const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.19 2002-11-22 00:12:23 charles Exp $";
  31 extern const char *yaffs_guts_c_version;
  32
  33
  34 #include <linux/config.h>
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/version.h>
  38 #include <linux/slab.h>
  39 #include <linux/init.h>
  40 #include <linux/list.h>
  41 #include <linux/fs.h>
  42 #include <linux/proc_fs.h>
  43 #include <linux/pagemap.h>
  44 #include <linux/mtd/mtd.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/string.h>
  47 #include <linux/locks.h>
  48
  49 #include <asm/uaccess.h>
  50
  51 #include "yportenv.h"
  52 #include "yaffs_guts.h"
  53
  54
  55
  56
  57 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
  58
  59 #ifdef CONFIG_YAFFS_RAM_ENABLED
  60 #include "yaffs_nandemul.h"
  61 // 2 MB of RAM for emulation
  62 #define YAFFS_RAM_EMULATION_SIZE  0x200000
  63 #endif //CONFIG_YAFFS_RAM_ENABLED
  64
  65 #ifdef CONFIG_YAFFS_MTD_ENABLED
  66 #include <linux/mtd/mtd.h>
  67 #include "yaffs_mtdif.h"
  68 #endif //CONFIG_YAFFS_MTD_ENABLED
  69
  70 #define T(x) printk x
  71
  72
  73
  74 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
  75 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
  76 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
  77
  78
  79
  80 static void yaffs_put_super(struct super_block *sb);
  81
  82 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos);
  83 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
  84 static int yaffs_file_flush(struct file* file);
  85
  86 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
  87
  88 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
  89
  90 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
  91 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
  92 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
  93 static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
  94 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
  95 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
  96 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
  97 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
  98 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
  99
 100 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 101 static void yaffs_read_inode (struct inode *inode);
 102 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent);
 103 static void yaffs_put_inode (struct inode *inode);
 104 static void yaffs_delete_inode(struct inode *);
 105 static void yaffs_clear_inode(struct inode *);
 106
 107 static int yaffs_readpage(struct file *file, struct page * page);
 108
 109 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 110 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 111
 112 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen);
 113 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 114
 115
 116
 117
 118 static struct address_space_operations yaffs_file_address_operations = {
 119         readpage:               yaffs_readpage,
 120         prepare_write:  yaffs_prepare_write,
 121         commit_write:   yaffs_commit_write
 122 };
 123
 124
 125 static struct file_operations yaffs_file_operations = {
 126 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
 127         read:           generic_file_read,
 128         write:          generic_file_write,
 129 #else
 130         read:           yaffs_file_read,
 131         write:          yaffs_file_write,
 132 #endif
 133         mmap:           generic_file_mmap,
 134         flush:          yaffs_file_flush,
 135         fsync:          yaffs_sync_object,
 136 };
 137
 138
 139 static struct inode_operations yaffs_file_inode_operations = {
 140         setattr:        yaffs_setattr,
 141 };
 142
 143
 144 struct inode_operations yaffs_symlink_inode_operations =
 145 {
 146         readlink:       yaffs_readlink,
 147         follow_link:    yaffs_follow_link,
 148         setattr:        yaffs_setattr
 149 };
 150
 151 static struct inode_operations yaffs_dir_inode_operations = {
 152         create:         yaffs_create,
 153         lookup:         yaffs_lookup,
 154         link:           yaffs_link,
 155         unlink:         yaffs_unlink,
 156         symlink:        yaffs_symlink,
 157         mkdir:          yaffs_mkdir,
 158         rmdir:          yaffs_unlink,
 159         mknod:          yaffs_mknod,
 160         rename:         yaffs_rename,
 161         setattr:        yaffs_setattr,
 162 };
 163
 164 static struct file_operations yaffs_dir_operations = {
 165         read:           generic_read_dir,
 166         readdir:        yaffs_readdir,
 167         fsync:          yaffs_sync_object,
 168 };
 169
 170
 171 static struct super_operations yaffs_super_ops = {
 172         statfs:                 yaffs_statfs,
 173         read_inode:             yaffs_read_inode,
 174         put_inode:              yaffs_put_inode,
 175         put_super:              yaffs_put_super,
 176 //      remount_fs:
 177         delete_inode:           yaffs_delete_inode,
 178         clear_inode:            yaffs_clear_inode,
 179 };
 180
 181
 182
 183 static void yaffs_GrossLock(yaffs_Device *dev)
 184 {
 185         T((KERN_DEBUG"yaffs locking\n"));
 186
 187         down(&dev->grossLock);
 188 }
 189
 190 static void yaffs_GrossUnlock(yaffs_Device *dev)
 191 {
 192         T((KERN_DEBUG"yaffs unlocking\n"));
 193         up(&dev->grossLock);
 194
 195 }
 196
 197 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen)
 198 {
 199         unsigned char *alias;
 200         int ret;
 201
 202         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 203
 204
 205         yaffs_GrossLock(dev);
 206
 207         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 208
 209         yaffs_GrossUnlock(dev);
 210
 211         if(!alias)
 212                 return -ENOMEM;
 213
 214         ret = vfs_readlink(dentry, buffer, buflen, alias);
 215         kfree(alias);
 216         return ret;
 217 }
 218
 219 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 220 {
 221         unsigned char *alias;
 222         int ret;
 223         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 224
 225
 226         yaffs_GrossLock(dev);
 227
 228         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 229
 230         yaffs_GrossUnlock(dev);
 231
 232         if(!alias)
 233                 return -ENOMEM;
 234
 235         ret = vfs_follow_link(nd,alias);
 236         kfree(alias);
 237         return ret;
 238 }
 239
 240
 241 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 242
 243 /*
 244  * Lookup is used to find objects in the fs
 245  */
 246 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 247 {
 248         yaffs_Object *obj;
 249         struct inode *inode;
 250
 251         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 252
 253
 254         yaffs_GrossLock(dev);
 255
 256
 257         T((KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 258
 259         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 260
 261         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 262
 263
 264
 265         if(obj)
 266         {
 267                 T((KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 268
 269                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode,0,obj);
 270
 271                 if(inode)
 272                 {
 273                         T((KERN_DEBUG"yaffs_loookup dentry \n"));
 274                         //dget(dentry); // try to solve directory bug
 275                         d_add(dentry,inode);
 276
 277                         yaffs_GrossUnlock(dev);
 278
 279                         // return dentry;
 280                         return NULL;
 281                 }
 282
 283         }
 284         else
 285         {
 286                 T((KERN_DEBUG"yaffs_lookup not found\n"));
 287
 288         }
 289         yaffs_GrossUnlock(dev);
 290
 291         return NULL;
 292         //      return (ERR_PTR(-EIO));
 293
 294 }
 295
 296 // For now put inode is just for debugging
 297 // Put inode is called when the inode **structure** is put.
 298 static void yaffs_put_inode(struct inode *inode)
 299 {
 300         T(("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 301
 302 }
 303
 304 // clear is called to tell the fs to release any per-inode data it holds
 305 static void yaffs_clear_inode(struct inode *inode)
 306 {
 307         yaffs_Object *obj = yaffs_InodeToObject(inode);
 308
 309         T(("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 310                 obj ? "object exists" : "null object"));
 311
 312         if(obj)
 313         {
 314                 obj->myInode = NULL;
 315                 inode->u.generic_ip = NULL;
 316         }
 317
 318
 319 }
 320
 321 // delete is called when the link count is zero and the inode
 322 // is put (ie. nobody wants to know about it anymore, time to
 323 // delete the file).
 324 // NB Must call clear_inode()
 325 static void yaffs_delete_inode(struct inode *inode)
 326 {
 327         yaffs_Object *obj = yaffs_InodeToObject(inode);
 328         yaffs_Device *dev;
 329
 330         T(("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 331                 obj ? "object exists" : "null object"));
 332
 333         if(obj)
 334         {
 335                 dev = obj->myDev;
 336                 yaffs_GrossLock(dev);
 337                 yaffs_DeleteFile(obj);
 338                 yaffs_GrossUnlock(dev);
 339         }
 340         clear_inode(inode);
 341 }
 342
 343
 344 static int yaffs_file_flush(struct file* file)
 345 {
 346         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 347
 348         yaffs_Device *dev = obj->myDev;
 349
 350         T((KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 351                                 obj->dirty ? "dirty" : "clean"));
 352
 353         yaffs_GrossLock(dev);
 354
 355     yaffs_FlushFile(obj);
 356
 357         yaffs_GrossUnlock(dev);
 358
 359     return 0;
 360 }
 361
 362
 363
 364 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 365 {
 366         // Lifted from jffs2
 367
 368         yaffs_Object *obj;
 369         unsigned char *pg_buf;
 370         int ret;
 371
 372         yaffs_Device *dev;
 373
 374         T((KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 375                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 376
 377         obj  = yaffs_DentryToObject(f->f_dentry);
 378
 379         dev = obj->myDev;
 380
 381
 382         if (!PageLocked(pg))
 383                 PAGE_BUG(pg);
 384
 385         pg_buf = kmap(pg);
 386         /* FIXME: Can kmap fail? */
 387
 388         yaffs_GrossLock(dev);
 389
 390         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 391
 392         yaffs_GrossUnlock(dev);
 393
 394         if(ret >= 0) ret = 0;
 395
 396         if (ret) {
 397                 ClearPageUptodate(pg);
 398                 SetPageError(pg);
 399         } else {
 400                 SetPageUptodate(pg);
 401                 ClearPageError(pg);
 402         }
 403
 404         flush_dcache_page(pg);
 405         kunmap(pg);
 406
 407
 408         T((KERN_DEBUG"yaffs_readpage done\n"));
 409         return ret;
 410 }
 411
 412 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 413 {
 414         int ret = yaffs_readpage_nolock(f,pg);
 415         UnlockPage(pg);
 416         return ret;
 417 }
 418
 419 static int yaffs_readpage(struct file *f, struct page * pg)
 420 {
 421         return yaffs_readpage_unlock(f,pg);
 422 }
 423
 424
 425 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 426 {
 427
 428         T((KERN_DEBUG"yaffs_prepair_write\n"));
 429         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 430                 return  yaffs_readpage_nolock(f,pg);
 431
 432         return 0;
 433
 434 }
 435
 436 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 437 {
 438
 439         void *addr = page_address(pg) + offset;
 440         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 441         int nBytes = to - offset;
 442         int nWritten;
 443
 444         unsigned spos = pos;
 445         unsigned saddr = (unsigned)addr;
 446
 447         T((KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 448
 449         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 450
 451         if(nWritten != nBytes)
 452         {
 453                 T((KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 454                 SetPageError(pg);
 455                 ClearPageUptodate(pg);
 456         }
 457         else
 458         {
 459                 SetPageUptodate(pg);
 460         }
 461
 462         T((KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 463
 464         return nWritten;
 465
 466 }
 467
 468
 469
 470 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 471 {
 472         if (inode && obj)
 473         {
 474                 inode->i_ino = obj->objectId;
 475                 inode->i_mode = obj->st_mode;
 476                 inode->i_uid = obj->st_uid;
 477                 inode->i_gid = obj->st_gid;
 478                 inode->i_blksize = inode->i_sb->s_blocksize;
 479                 inode->i_blocks = 0;
 480                 inode->i_rdev = obj->st_rdev;;
 481                 inode->i_atime = obj->st_atime;
 482                 inode->i_mtime = obj->st_mtime;
 483                 inode->i_ctime = obj->st_ctime;
 484                 inode->i_size = yaffs_GetObjectFileLength(obj);
 485                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 486
 487                 T((KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 488                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 489
 490                 switch (obj->st_mode & S_IFMT)
 491                 {
 492                         default: // fifo, device or socket
 493                                 init_special_inode(inode, obj->st_mode, obj->st_rdev);
 494                                 break;
 495                         case S_IFREG:   // file
 496                                 inode->i_op = &yaffs_file_inode_operations;
 497                                 inode->i_fop = &yaffs_file_operations;
 498                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 499                                 break;
 500                         case S_IFDIR:   // directory
 501                                 inode->i_op = &yaffs_dir_inode_operations;
 502                                 inode->i_fop = &yaffs_dir_operations;
 503                                 break;
 504                         case S_IFLNK:   // symlink
 505                                 inode->i_op = &yaffs_symlink_inode_operations;
 506                                 break;
 507                 }
 508
 509
 510                 inode->u.generic_ip = obj;
 511                 obj->myInode = inode;
 512
 513         }
 514         else
 515         {
 516                 T((KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 517         }
 518
 519 }
 520
 521 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 522 {
 523         struct inode * inode;
 524
 525         T((KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 526
 527         inode = iget(sb,obj->objectId);
 528
 529         // NB Side effect: iget calls back to yaffs_read_inode().
 530         // iget also increments the inode's i_count
 531
 532         return inode;
 533 }
 534
 535 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 536 {
 537         yaffs_Object *obj;
 538         int nRead,ipos;
 539         struct inode *inode;
 540         yaffs_Device *dev;
 541
 542         T((KERN_DEBUG"yaffs_file_read\n"));
 543
 544         obj  = yaffs_DentryToObject(f->f_dentry);
 545
 546         dev = obj->myDev;
 547
 548         yaffs_GrossLock(dev);
 549
 550         inode = f->f_dentry->d_inode;
 551
 552         if (*pos < inode->i_size)
 553         {
 554                         if (*pos + n > inode->i_size)
 555                         {
 556                                 n = inode->i_size - *pos;
 557                         }
 558         }
 559         else
 560         {
 561                 n = 0;
 562         }
 563
 564         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 565         if(nRead > 0)
 566         {
 567                 f->f_pos += nRead;
 568         }
 569
 570         yaffs_GrossUnlock(dev);
 571
 572         ipos = *pos;
 573
 574         T((KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 575         return nRead;
 576
 577 }
 578
 579
 580 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 581 {
 582         yaffs_Object *obj;
 583         int nWritten,ipos;
 584         struct inode *inode;
 585         yaffs_Device *dev;
 586
 587
 588         obj  = yaffs_DentryToObject(f->f_dentry);
 589
 590         dev = obj->myDev;
 591
 592         yaffs_GrossLock(dev);
 593
 594         inode = f->f_dentry->d_inode;
 595
 596         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 597         {
 598                 ipos = inode->i_size;
 599         }
 600         else
 601         {
 602                 ipos = *pos;
 603         }
 604
 605
 606         if(!obj)
 607         {
 608                 T((KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 609         }
 610         else
 611         {
 612                 T((KERN_DEBUG"yaffs_file_write about to write writing %d bytes to object %d at %d\n",n,obj->objectId,ipos));
 613         }
 614
 615         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n);
 616
 617         T((KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 618         if(nWritten > 0)
 619         {
 620                 ipos += nWritten;
 621                 *pos = ipos;
 622                 if(ipos > inode->i_size)
 623                 {
 624                         inode->i_size = ipos;
 625                         inode->i_blocks = (ipos + inode->i_blksize - 1)/ inode->i_blksize;
 626
 627                         T((KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 628                 }
 629
 630         }
 631         yaffs_GrossUnlock(dev);
 632
 633         return nWritten != n ? -ENOSPC : nWritten;
 634 }
 635
 636
 637 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 638 {
 639         yaffs_Object *obj;
 640         yaffs_Device *dev;
 641         struct inode *inode = f->f_dentry->d_inode;
 642         unsigned long offset, curoffs;
 643         struct list_head *i;
 644         yaffs_Object *l;
 645
 646         char name[YAFFS_MAX_NAME_LENGTH +1];
 647
 648         obj =  yaffs_DentryToObject(f->f_dentry);
 649         dev = obj->myDev;
 650
 651         yaffs_GrossLock(dev);
 652
 653         offset = f->f_pos;
 654
 655         T(("yaffs_readdir: starting at %d\n",(int)offset));
 656
 657         if(offset == 0)
 658         {
 659         T((KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 660                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 661                 {
 662                         goto out;
 663                 }
 664                 offset++;
 665                 f->f_pos++;
 666         }
 667         if(offset == 1)
 668         {
 669                 T((KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 670                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 671                 {
 672                         goto out;
 673                 }
 674                 offset++;
 675                 f->f_pos++;
 676         }
 677
 678         curoffs = 1;
 679
 680         list_for_each(i,&obj->variant.directoryVariant.children)
 681         {
 682                 curoffs++;
 683                 if(curoffs >= offset)
 684                 {
 685                         l = list_entry(i, yaffs_Object,siblings);
 686
 687                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 688                         T((KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 689
 690                         if(filldir(dirent,
 691                                            name,
 692                                            strlen(name),
 693                                            offset,
 694                                            yaffs_GetObjectInode(l),
 695                                            yaffs_GetObjectType(l))
 696                                            < 0)
 697                         {
 698                                 goto up_and_out;
 699                         }
 700
 701                         offset++;
 702                         f->f_pos++;
 703                 }
 704         }
 705
 706   up_and_out:
 707   out:
 708
 709     yaffs_GrossUnlock(dev);
 710
 711         return 0;
 712 }
 713
 714
 715 /*
 716  * File creation. Allocate an inode, and we're done..
 717  */
 718 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 719 {
 720         struct inode *inode;
 721
 722         yaffs_Object *obj = NULL;
 723         yaffs_Device *dev;
 724
 725         yaffs_Object *parent = yaffs_InodeToObject(dir);
 726
 727         int error = -ENOSPC;
 728
 729         if(parent)
 730         {
 731                 T((KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 732                                          parent->objectId,parent->variantType));
 733         }
 734         else
 735         {
 736                 T((KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 737                 return -EPERM;
 738         }
 739
 740         T(("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 741                                         dentry->d_name.name, mode,rdev));
 742
 743         dev = parent->myDev;
 744
 745         yaffs_GrossLock(dev);
 746
 747         switch (mode & S_IFMT)
 748         {
 749                 default:
 750                         // Special (socket, fifo, device...)
 751                         T((KERN_DEBUG"yaffs_mknod: making special\n"));
 752                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 753                         break;
 754                 case S_IFREG:   // file
 755                         T((KERN_DEBUG"yaffs_mknod: making file\n"));
 756                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 757                         break;
 758                 case S_IFDIR:   // directory
 759                         T((KERN_DEBUG"yaffs_mknod: making directory\n"));
 760                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 761                         break;
 762                 case S_IFLNK:   // symlink
 763                         T((KERN_DEBUG"yaffs_mknod: making file\n"));
 764                         obj = NULL; // Do we ever get here?
 765                         break;
 766         }
 767
 768         if(obj)
 769         {
 770                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 771                 d_instantiate(dentry, inode);
 772                 T((KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 773                 error = 0;
 774         }
 775         else
 776         {
 777                 T((KERN_DEBUG"yaffs_mknod failed making object\n"));
 778                 error = -ENOMEM;
 779         }
 780
 781         yaffs_GrossUnlock(dev);
 782
 783         return error;
 784 }
 785
 786 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 787 {
 788         int retVal;
 789         T((KERN_DEBUG"yaffs_mkdir\n"));
 790         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 791 #if 0
 792  // attempt to fix dir bug - didn't work
 793         if(!retVal)
 794         {
 795                 dget(dentry);
 796         }
 797 #endif
 798         return retVal;
 799 }
 800
 801 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 802 {
 803         T((KERN_DEBUG"yaffs_create\n"));
 804         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 805 }
 806
 807
 808 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 809 {
 810         int retVal;
 811         int nlinks;
 812
 813         yaffs_Device *dev;
 814
 815
 816         T((KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
 817
 818         dev = yaffs_InodeToObject(dir)->myDev;
 819
 820         yaffs_GrossLock(dev);
 821
 822
 823         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
 824
 825
 826         yaffs_GrossUnlock(dev);
 827
 828         if( retVal == YAFFS_OK)
 829         {
 830                 dentry->d_inode->i_nlink--;
 831                 mark_inode_dirty(dentry->d_inode);
 832                 return 0;
 833         }
 834         else
 835         {
 836                 return -ENOTEMPTY;
 837         }
 838 }
 839
 840
 841 /*
 842  * Create a link...
 843  */
 844 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
 845 {
 846         struct inode *inode = old_dentry->d_inode;
 847         yaffs_Object *obj = NULL;
 848         yaffs_Object *link=NULL;
 849         yaffs_Device *dev;
 850
 851         T((KERN_DEBUG"yaffs_link\n"));
 852
 853         obj = yaffs_InodeToObject(inode);
 854         dev = obj->myDev;
 855
 856         yaffs_GrossLock(dev);
 857
 858         link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
 859
 860
 861         if(link)
 862         {
 863                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
 864                 d_instantiate(dentry, old_dentry->d_inode);
 865                 atomic_inc(&old_dentry->d_inode->i_count);
 866                 T((KERN_DEBUG"yaffs_link link count %d i_count %d\n",
 867                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
 868
 869         }
 870
 871         yaffs_GrossUnlock(dev);
 872
 873
 874         if(link)
 875         {
 876
 877                 return 0;
 878         }
 879
 880
 881         return -EPERM;
 882 }
 883
 884
 885 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
 886 {
 887         yaffs_Object *obj;
 888         yaffs_Device *dev;
 889
 890         T((KERN_DEBUG"yaffs_symlink\n"));
 891
 892         dev = yaffs_InodeToObject(dir)->myDev;
 893         yaffs_GrossLock(dev);
 894         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
 895                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
 896                                                          symname);
 897         yaffs_GrossUnlock(dev);
 898
 899         if(obj)
 900         {
 901
 902                 struct inode* inode;
 903
 904                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode, 0, obj);
 905                 d_instantiate(dentry, inode);
 906                 T((KERN_DEBUG"symlink created OK\n"));
 907                 return 0;
 908         }
 909         else
 910         {
 911                 T((KERN_DEBUG"symlink not created\n"));
 912
 913         }
 914
 915         return -ENOMEM;
 916 }
 917
 918 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
 919 {
 920
 921         yaffs_Object *obj;
 922         yaffs_Device *dev;
 923
 924         obj = yaffs_DentryToObject(dentry);
 925
 926         dev = obj->myDev;
 927
 928         T((KERN_DEBUG"yaffs_sync_object\n"));
 929         yaffs_GrossLock(dev);
 930         yaffs_FlushFile(obj);
 931         yaffs_GrossUnlock(dev);
 932         return 0;
 933 }
 934
 935 /*
 936  * The VFS layer already does all the dentry stuff for rename.
 937  *
 938  * NB: POSIX says you can rename an object over an old object of the same name
 939  */
 940 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
 941 {
 942         yaffs_Device *dev;
 943         int retVal;
 944
 945         dev = yaffs_InodeToObject(old_dir)->myDev;
 946
 947         yaffs_GrossLock(dev);
 948
 949         // Unlink the target if it exists
 950         yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
 951
 952
 953         retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
 954                                          yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
 955         yaffs_GrossUnlock(dev);
 956
 957         if(retVal == YAFFS_OK)
 958         {
 959                 return 0;
 960         }
 961         else
 962         {
 963                 return -ENOTEMPTY;
 964         }
 965
 966
 967 }
 968
 969 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
 970 {
 971         struct inode *inode = dentry->d_inode;
 972         int error;
 973         yaffs_Device *dev;
 974
 975         T((KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
 976
 977         if((error = inode_change_ok(inode,attr)) == 0)
 978         {
 979
 980                 dev = yaffs_InodeToObject(inode)->myDev;
 981                 yaffs_GrossLock(dev);
 982                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
 983                 {
 984                         error = 0;
 985                 }
 986                 else
 987                 {
 988                         error = -EPERM;
 989                 }
 990                 yaffs_GrossUnlock(dev);
 991                 inode_setattr(inode,attr);
 992         }
 993         return error;
 994 }
 995
 996 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
 997 {
 998         yaffs_Device *dev = yaffs_SuperToDevice(sb);
 999         T((KERN_DEBUG"yaffs_statfs\n"));
1000
1001         yaffs_GrossLock(dev);
1002
1003         buf->f_type = YAFFS_MAGIC;
1004         buf->f_bsize = sb->s_blocksize;
1005         buf->f_namelen = 255;
1006         buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * YAFFS_CHUNKS_PER_BLOCK/
1007                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1008         buf->f_files = 0;
1009         buf->f_ffree = 0;
1010         buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1011                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1012         buf->f_bavail =  buf->f_bfree;
1013
1014         yaffs_GrossUnlock(dev);
1015         return 0;
1016 }
1017
1018 static void yaffs_read_inode (struct inode *inode)
1019 {
1020         // NB This is called as a side effect of other functions and
1021         // thus gross locking should always be in place already.
1022
1023         yaffs_Object *obj ;
1024         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1025
1026         T((KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1027
1028         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1029
1030         yaffs_FillInodeFromObject(inode,obj);
1031
1032 }
1033
1034
1035
1036 static yaffs_Device *yaffs_dev;
1037 static yaffs_Device *yaffsram_dev;
1038
1039
1040
1041 static void yaffs_put_super(struct super_block *sb)
1042 {
1043         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1044
1045         yaffs_GrossLock(dev);
1046         if(dev->putSuperFunc)
1047         {
1048                  dev->putSuperFunc(sb);
1049         }
1050         yaffs_Deinitialise(dev);
1051         yaffs_GrossUnlock(dev);
1052
1053         if(dev == yaffs_dev) yaffs_dev = NULL;
1054         if(dev == yaffsram_dev) yaffsram_dev = NULL;
1055
1056         kfree(dev);
1057 }
1058
1059
1060 #ifdef CONFIG_YAFFS_MTD_ENABLED
1061
1062 static void  yaffs_MTDPutSuper(struct super_block *sb)
1063 {
1064
1065         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1066
1067         if(mtd->sync)
1068         {
1069                 mtd->sync(mtd);
1070         }
1071
1072         put_mtd_device(mtd);
1073 }
1074
1075 #endif
1076
1077
1078 static struct super_block *yaffs_internal_read_super(int useRam, struct super_block * sb, void * data, int silent)
1079 {
1080         int nBlocks;
1081         struct inode * inode;
1082         struct dentry * root;
1083         yaffs_Device *dev;
1084
1085         sb->s_magic = YAFFS_MAGIC;
1086         sb->s_op = &yaffs_super_ops;
1087
1088         if(!sb)
1089                 printk(KERN_INFO"yaffs: sb is NULL\n");
1090         else if(!sb->s_dev)
1091                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1092         else if(! kdevname(sb->s_dev))
1093                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1094         else
1095                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1096
1097
1098
1099 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1100         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1101         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1102 #else
1103         sb->s_blocksize = PAGE_CACHE_SIZE;
1104         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1105 #endif
1106         T(("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1107
1108 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1109         T(("yaffs: Write verification disabled. All guarantees null and void\n");
1110 #endif
1111
1112
1113
1114         if(useRam)
1115         {
1116
1117 #ifdef CONFIG_YAFFS_RAM_ENABLED
1118                 // Set the yaffs_Device up for ram emulation
1119
1120                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1121                 if(!dev)
1122                 {
1123                         // Deep shit could not allocate device structure
1124                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1125                         return NULL;
1126                 }
1127
1128                 memset(dev,0,sizeof(yaffs_Device));
1129                 dev->genericDevice = NULL; // Not used for RAM emulation.
1130
1131                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1132                 dev->startBlock = 1;  // Don't use block 0
1133                 dev->endBlock = nBlocks - 1;
1134
1135                 dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1136                 dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1137                 dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1138                 dev->initialiseNAND = nandemul_InitialiseNAND;
1139
1140                 yaffsram_dev = dev;
1141
1142 #endif
1143
1144         }
1145         else
1146         {
1147 #ifdef CONFIG_YAFFS_MTD_ENABLED
1148                 struct mtd_info *mtd;
1149
1150                 printk(KERN_DEBUG "yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1151                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev));
1152
1153                 // Hope it's a NAND mtd
1154                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1155                 if (!mtd)
1156                 {
1157                         printk(KERN_DEBUG "yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev));
1158                         return NULL;
1159                 }
1160
1161                 if(mtd->type != MTD_NANDFLASH)
1162                 {
1163                         printk(KERN_DEBUG "yaffs: MTD device is not NAND it's type %d\n", mtd->type);
1164                         return NULL;
1165                 }
1166
1167                 //printk(KERN_DEBUG" erase %x\n",mtd->erase);
1168                 //printk(KERN_DEBUG" read %x\n",mtd->read);
1169                 //printk(KERN_DEBUG" write %x\n",mtd->write);
1170                 //printk(KERN_DEBUG" readoob %x\n",mtd->read_oob);
1171                 //printk(KERN_DEBUG" writeoob %x\n",mtd->write_oob);
1172                 //printk(KERN_DEBUG" oobblock %x\n",mtd->oobblock);
1173                 //printk(KERN_DEBUG" oobsize %x\n",mtd->oobsize);
1174
1175
1176                 if(!mtd->erase ||
1177                    !mtd->read  ||
1178                    !mtd->write ||
1179                    !mtd->read_oob ||
1180                    !mtd->write_oob)
1181                 {
1182                         printk(KERN_DEBUG "yaffs: MTD device does not support required functions\n");
1183                         return NULL;
1184                 }
1185
1186                 if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1187                    mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1188                 {
1189                         printk(KERN_DEBUG "yaffs: MTD device does not support have the right page sizes\n");
1190                         return NULL;
1191                 }
1192
1193
1194                 // OK, so if we got here, we have an MTD that's NAND and looks
1195                 // like it has the right capabilities
1196                 // Set the yaffs_Device up for ram emulation
1197
1198                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1199                 if(!dev)
1200                 {
1201                         // Deep shit could not allocate device structure
1202                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1203                         return NULL;
1204                 }
1205
1206                 memset(dev,0,sizeof(yaffs_Device));
1207                 dev->genericDevice = mtd;
1208
1209                 // Set up the memory size parameters....
1210
1211                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1212                 dev->startBlock = 1;  // Don't use block 0
1213                 dev->endBlock = nBlocks - 1;
1214
1215                 // ... and the functions.
1216                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1217                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1218                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1219                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1220
1221                 dev->putSuperFunc = yaffs_MTDPutSuper;
1222
1223                 yaffs_dev = dev;
1224
1225 #endif
1226         }
1227
1228         init_MUTEX(&dev->grossLock);
1229
1230
1231         yaffs_GrossLock(dev);
1232         yaffs_GutsInitialise(yaffs_SuperToDevice(sb));
1233
1234         T(("yaffs_read_super: guts initialised\n"));
1235
1236         // Create root inode
1237         inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(yaffs_SuperToDevice(sb)));
1238
1239         yaffs_GrossUnlock(dev);
1240
1241         if (!inode)
1242                 return NULL;
1243
1244         T(("yaffs_read_super: got root inode\n"));
1245
1246
1247         root = d_alloc_root(inode);
1248
1249         T(("yaffs_read_super: d_alloc_root done\n"));
1250
1251         if (!root) {
1252                 iput(inode);
1253                 return NULL;
1254         }
1255         sb->s_root = root;
1256
1257         T(("yaffs_read_super: done\n"));
1258         return sb;
1259 }
1260
1261 #ifdef CONFIG_YAFFS_MTD_ENABLED
1262 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1263 {
1264         return yaffs_internal_read_super(0,sb,data,silent);
1265 }
1266
1267 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1268 #endif
1269
1270 #ifdef CONFIG_YAFFS_RAM_ENABLED
1271
1272 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1273 {
1274         return yaffs_internal_read_super(1,sb,data,silent);
1275 }
1276
1277 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1278 #endif // CONFIG_YAFFS_RAM_ENABLED
1279
1280
1281 static struct proc_dir_entry *my_proc_entry;
1282 static struct proc_dir_entry *my_proc_ram_write_entry;
1283
1284 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
1285 {
1286         buf +=sprintf(buf,"\nDevice %s\n",name);
1287         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1288         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1289         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1290         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1291         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1292         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1293         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1294         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1295         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1296         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1297         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1298         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1299         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1300         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1301         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1302         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1303         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1304         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1305         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1306         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1307         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1308         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1309         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1310         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1311         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1312
1313         return buf;
1314 }
1315
1316 static int  yaffs_proc_read(
1317         char *page,
1318         char **start,
1319         off_t offset,
1320         int count,
1321         int *eof,
1322         void *data
1323         )
1324 {
1325
1326         char my_buffer[3000];
1327         char *buf;
1328         buf = my_buffer;
1329
1330         if (offset > 0) return 0;
1331
1332         /* Fill the buffer and get its length */
1333         buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
1334
1335         if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
1336         if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
1337
1338
1339         strcpy(page,my_buffer);
1340         return strlen(my_buffer);
1341 }
1342
1343
1344 static int  yaffs_proc_ram_write(
1345         char *page,
1346         char **start,
1347         off_t offset,
1348         int count,
1349         int *eof,
1350         void *data
1351         )
1352 {
1353
1354         printk(KERN_DEBUG "yaffs write size %d\n",count);
1355         return count;
1356 }
1357
1358 static int __init init_yaffs_fs(void)
1359 {
1360         int error = 0;
1361
1362         yaffs_dev = yaffsram_dev = NULL;
1363
1364         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Initialisation\n");
1365 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
1366         printk(KERN_DEBUG "yaffs is using generic read/write (caching)\n");
1367 #else
1368         printk(KERN_DEBUG "yaffs is using direct read/write (uncached)\n");
1369 #endif
1370
1371
1372     /* Install the proc_fs entry */
1373     my_proc_entry = create_proc_read_entry("yaffs",
1374                                            S_IRUGO | S_IFREG,
1375                                            &proc_root,
1376                                            yaffs_proc_read,
1377                                            NULL);
1378     if(!my_proc_entry)
1379     {
1380        return -ENOMEM;
1381     }
1382
1383 #ifdef CONFIG_YAFFS_RAM_ENABLED
1384 #if 0
1385     my_proc_ram_write_entry = create_proc_entry("yaffs_ram",
1386                                            S_IRUGO | S_IFREG,
1387                                            &proc_root);
1388
1389     if(!my_proc_ram_write_entry)
1390     {
1391        return -ENOMEM;
1392     }
1393     else
1394     {
1395         my_proc_ram_write_entry->write_proc = yaffs_proc_ram_write;
1396     }
1397 #endif
1398
1399     error = register_filesystem(&yaffs_ram_fs_type);
1400     if(error)
1401     {
1402         return error;
1403     }
1404 #endif //CONFIG_YAFFS_RAM_ENABLED
1405
1406 #ifdef CONFIG_YAFFS_MTD_ENABLED
1407         error = register_filesystem(&yaffs_fs_type);
1408         if(error)
1409         {
1410 #ifdef CONFIG_YAFFS_RAM_ENABLED
1411                 unregister_filesystem(&yaffs_ram_fs_type);
1412 #endif //CONFIG_YAFFS_RAM_ENABLED
1413         }
1414 #endif // CONFIG_YAFFS_MTD_ENABLED
1415
1416         return error;
1417 }
1418
1419 static void __exit exit_yaffs_fs(void)
1420 {
1421         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Clean up\n");
1422
1423     remove_proc_entry("yaffs",&proc_root);
1424
1425 #ifdef CONFIG_YAFFS_RAM_ENABLED
1426         unregister_filesystem(&yaffs_ram_fs_type);
1427 #endif
1428 #ifdef CONFIG_YAFFS_MTD_ENABLED
1429         unregister_filesystem(&yaffs_fs_type);
1430 #endif
1431
1432 }
1433
1434 module_init(init_yaffs_fs)
1435 module_exit(exit_yaffs_fs)
1436
1437 MODULE_DESCRIPTION("YAFFS - a NAND specific flash file system");
1438 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002");
1439 MODULE_LICENSE("GPL");
1440