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  * * Nick Bane for 2.5/2.6 integration.
  26  * * Andras Toth for mknod rdev issue.
  27  * * Michael Fischer for finding the problem with inode inconsistency.
  28  * * Some code bodily lifted from JFFS2.
  29  */
  30
  31
  32 const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.6 2005-07-03 10:32:40 charles Exp $";
  33 extern const char *yaffs_guts_c_version;
  34
  35
  36
  37 #include <linux/config.h>
  38 #include <linux/kernel.h>
  39 #include <linux/module.h>
  40 #include <linux/version.h>
  41 #include <linux/slab.h>
  42 #include <linux/init.h>
  43 #include <linux/list.h>
  44 #include <linux/fs.h>
  45 #include <linux/proc_fs.h>
  46 #include <linux/pagemap.h>
  47 #include <linux/mtd/mtd.h>
  48 #include <linux/interrupt.h>
  49 #include <linux/string.h>
  50
  51
  52 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  53
  54 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  55 #include <asm/statfs.h>
  56 #define UnlockPage(p) unlock_page(p)
  57 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  58 //#define kdevname(x) cdevname(to_kdev_t(x))
  59 #define kdevname(x) "(unavailable)"     // temporary fix
  60
  61 #else
  62
  63 #include <linux/locks.h>
  64
  65 #endif
  66
  67 #include <asm/uaccess.h>
  68
  69 #include "yportenv.h"
  70 #include "yaffs_guts.h"
  71
  72
  73
  74
  75 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
  76 //unsigned yaffs_traceMask = 0xFFFFFFFF;
  77
  78
  79 #ifdef CONFIG_YAFFS_RAM_ENABLED
  80 #include "yaffs_nandemul.h"
  81 // 2 MB of RAM for emulation
  82 #define YAFFS_RAM_EMULATION_SIZE  0x200000
  83 #endif //CONFIG_YAFFS_RAM_ENABLED
  84
  85 #if CONFIG_YAFFS2_RAM_ENABLED
  86 #include "yaffs_nandemul2k.h"
  87 #endif
  88
  89 #ifdef CONFIG_YAFFS_MTD_ENABLED
  90 #include <linux/mtd/mtd.h>
  91 #include "yaffs_mtdif.h"
  92 #include "yaffs_mtdif2.h"
  93 #endif //CONFIG_YAFFS_MTD_ENABLED
  94
  95 //#define T(x) printk x
  96
  97
  98
  99 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
 100 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
 101 //NCB #define yaffs_SuperToDevice(sb)   ((yaffs_Device *)sb->u.generic_sbp)
 102
 103 //#if defined(CONFIG_KERNEL_2_5)
 104 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 105 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
 106 #else
 107 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 108 #endif
 109
 110
 111 static void yaffs_put_super(struct super_block *sb);
 112
 113 #if 0
 114 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos);
 115 #endif
 116
 117 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
 118
 119 static int yaffs_file_flush(struct file* file);
 120
 121 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
 122
 123 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 124
 125 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 126 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 127 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n);
 128 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n);
 129 #else
 130 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 131 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
 132 #endif
 133 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
 134 static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
 135 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
 136 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
 137
 138 //#if defined(CONFIG_KERNEL_2_5)
 139 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 140 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
 141 #else
 142 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
 143 #endif
 144 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
 145 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 146
 147 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 148 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 149 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 150 #else
 151 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 152 #endif
 153 static void yaffs_read_inode (struct inode *inode);
 154
 155 //#if defined(CONFIG_KERNEL_2_5)
 156 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 157 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data);
 158 #else
 159 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent);
 160 #endif
 161
 162 static void yaffs_put_inode (struct inode *inode);
 163 static void yaffs_delete_inode(struct inode *);
 164 static void yaffs_clear_inode(struct inode *);
 165
 166 static int yaffs_readpage(struct file *file, struct page * page);
 167 static int yaffs_writepage(struct page *page);
 168 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 169 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 170
 171 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen);
 172 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 173
 174
 175
 176
 177 static struct address_space_operations yaffs_file_address_operations = {
 178         readpage:               yaffs_readpage,
 179         writepage:              yaffs_writepage,
 180         prepare_write:  yaffs_prepare_write,
 181         commit_write:   yaffs_commit_write
 182 };
 183
 184
 185 static struct file_operations yaffs_file_operations = {
 186
 187         read:           generic_file_read,
 188         write:          generic_file_write,
 189
 190         mmap:           generic_file_mmap,
 191         flush:          yaffs_file_flush,
 192         fsync:          yaffs_sync_object,
 193 };
 194
 195
 196 static struct inode_operations yaffs_file_inode_operations = {
 197         setattr:        yaffs_setattr,
 198 };
 199
 200
 201 struct inode_operations yaffs_symlink_inode_operations =
 202 {
 203         readlink:       yaffs_readlink,
 204         follow_link:    yaffs_follow_link,
 205         setattr:        yaffs_setattr
 206 };
 207
 208 static struct inode_operations yaffs_dir_inode_operations = {
 209         create:         yaffs_create,
 210         lookup:         yaffs_lookup,
 211         link:           yaffs_link,
 212         unlink:         yaffs_unlink,
 213         symlink:        yaffs_symlink,
 214         mkdir:          yaffs_mkdir,
 215         rmdir:          yaffs_unlink,
 216         mknod:          yaffs_mknod,
 217         rename:         yaffs_rename,
 218         setattr:        yaffs_setattr,
 219 };
 220
 221 static struct file_operations yaffs_dir_operations = {
 222         read:           generic_read_dir,
 223         readdir:        yaffs_readdir,
 224         fsync:          yaffs_sync_object,
 225 };
 226
 227
 228 static struct super_operations yaffs_super_ops = {
 229         statfs:                 yaffs_statfs,
 230         read_inode:             yaffs_read_inode,
 231         put_inode:              yaffs_put_inode,
 232         put_super:              yaffs_put_super,
 233 //      remount_fs:
 234         delete_inode:           yaffs_delete_inode,
 235         clear_inode:            yaffs_clear_inode,
 236 };
 237
 238
 239
 240 static void yaffs_GrossLock(yaffs_Device *dev)
 241 {
 242         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
 243
 244         down(&dev->grossLock);
 245 }
 246
 247 static void yaffs_GrossUnlock(yaffs_Device *dev)
 248 {
 249         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
 250         up(&dev->grossLock);
 251
 252 }
 253
 254 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen)
 255 {
 256         unsigned char *alias;
 257         int ret;
 258
 259         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 260
 261
 262         yaffs_GrossLock(dev);
 263
 264         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 265
 266         yaffs_GrossUnlock(dev);
 267
 268         if(!alias)
 269                 return -ENOMEM;
 270
 271         ret = vfs_readlink(dentry, buffer, buflen, alias);
 272         kfree(alias);
 273         return ret;
 274 }
 275
 276 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 277 {
 278         unsigned char *alias;
 279         int ret;
 280         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 281
 282
 283         yaffs_GrossLock(dev);
 284
 285         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 286
 287         yaffs_GrossUnlock(dev);
 288
 289         if(!alias)
 290                 return -ENOMEM;
 291
 292         ret = vfs_follow_link(nd,alias);
 293         kfree(alias);
 294         return ret;
 295 }
 296
 297
 298 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 299
 300 /*
 301  * Lookup is used to find objects in the fs
 302  */
 303 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 304 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 305
 306 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 307 #else
 308 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 309 #endif
 310 {
 311         yaffs_Object *obj;
 312         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 313
 314         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 315
 316
 317         yaffs_GrossLock(dev);
 318
 319
 320         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 321
 322         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 323
 324         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 325
 326
 327
 328         if(obj)
 329         {
 330                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 331
 332                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode,0,obj);
 333
 334                 if(inode)
 335                 {
 336                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
 337 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 338 #if 0
 339                         //dget(dentry); // try to solve directory bug
 340                         d_add(dentry,inode);
 341
 342                         yaffs_GrossUnlock(dev);
 343
 344                         // return dentry;
 345                         return NULL;
 346 #endif
 347                 }
 348
 349         }
 350         else
 351         {
 352                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
 353
 354         }
 355         yaffs_GrossUnlock(dev);
 356
 357 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 358         d_add(dentry,inode);
 359
 360         return NULL;
 361         //      return (ERR_PTR(-EIO));
 362
 363 }
 364
 365 // For now put inode is just for debugging
 366 // Put inode is called when the inode **structure** is put.
 367 static void yaffs_put_inode(struct inode *inode)
 368 {
 369         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 370
 371 }
 372
 373 // clear is called to tell the fs to release any per-inode data it holds
 374 static void yaffs_clear_inode(struct inode *inode)
 375 {
 376         yaffs_Object *obj;
 377         yaffs_Device *dev;
 378
 379         obj = yaffs_InodeToObject(inode);
 380
 381         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 382                 obj ? "object exists" : "null object"));
 383
 384         if(obj)
 385         {
 386                 dev = obj->myDev;
 387                 yaffs_GrossLock(dev);
 388
 389                 // Clear the association between the inode ant the yaffs_Object.
 390                 obj->myInode = NULL;
 391                 inode->u.generic_ip = NULL;
 392
 393                 // If the object freeing was deferred, then the real free happens now.
 394                 // This should fix the inode inconsistency problem.
 395
 396                 yaffs_HandleDeferedFree(obj);
 397
 398                 yaffs_GrossUnlock(dev);
 399         }
 400
 401
 402 }
 403
 404 // delete is called when the link count is zero and the inode
 405 // is put (ie. nobody wants to know about it anymore, time to
 406 // delete the file).
 407 // NB Must call clear_inode()
 408 static void yaffs_delete_inode(struct inode *inode)
 409 {
 410         yaffs_Object *obj = yaffs_InodeToObject(inode);
 411         yaffs_Device *dev;
 412
 413         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 414                 obj ? "object exists" : "null object"));
 415
 416         if(obj)
 417         {
 418                 dev = obj->myDev;
 419                 yaffs_GrossLock(dev);
 420                 yaffs_DeleteFile(obj);
 421                 yaffs_GrossUnlock(dev);
 422         }
 423         clear_inode(inode);
 424 }
 425
 426
 427 static int yaffs_file_flush(struct file* file)
 428 {
 429         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 430
 431         yaffs_Device *dev = obj->myDev;
 432
 433         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 434                                 obj->dirty ? "dirty" : "clean"));
 435
 436         yaffs_GrossLock(dev);
 437
 438     yaffs_FlushFile(obj,1);
 439
 440         yaffs_GrossUnlock(dev);
 441
 442     return 0;
 443 }
 444
 445
 446
 447 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 448 {
 449         // Lifted from jffs2
 450
 451         yaffs_Object *obj;
 452         unsigned char *pg_buf;
 453         int ret;
 454
 455         yaffs_Device *dev;
 456
 457         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 458                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 459
 460         obj  = yaffs_DentryToObject(f->f_dentry);
 461
 462         dev = obj->myDev;
 463
 464
 465         if (!PageLocked(pg))
 466                 PAGE_BUG(pg);
 467
 468         pg_buf = kmap(pg);
 469         /* FIXME: Can kmap fail? */
 470
 471         yaffs_GrossLock(dev);
 472
 473         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 474
 475         yaffs_GrossUnlock(dev);
 476
 477         if(ret >= 0) ret = 0;
 478
 479         if (ret) {
 480                 ClearPageUptodate(pg);
 481                 SetPageError(pg);
 482         } else {
 483                 SetPageUptodate(pg);
 484                 ClearPageError(pg);
 485         }
 486
 487         flush_dcache_page(pg);
 488         kunmap(pg);
 489
 490
 491         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
 492         return ret;
 493 }
 494
 495 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 496 {
 497         int ret = yaffs_readpage_nolock(f,pg);
 498         UnlockPage(pg);
 499         return ret;
 500 }
 501
 502 static int yaffs_readpage(struct file *f, struct page * pg)
 503 {
 504         return yaffs_readpage_unlock(f,pg);
 505 }
 506
 507 // writepage inspired by/stolen from smbfs
 508 //
 509
 510 static int yaffs_writepage(struct page *page)
 511 {
 512         struct address_space *mapping = page->mapping;
 513         struct inode *inode;
 514         unsigned long end_index;
 515         char *buffer;
 516         yaffs_Object *obj;
 517         int nWritten = 0;
 518         unsigned nBytes;
 519
 520         if (!mapping)
 521                 BUG();
 522         inode = mapping->host;
 523         if (!inode)
 524                 BUG();
 525
 526         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 527
 528         /* easy case */
 529         if (page->index < end_index)
 530         {
 531                 nBytes = PAGE_CACHE_SIZE;
 532         }
 533         else
 534         {
 535                 nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
 536         }
 537         //  What's happening here?
 538         ///* OK, are we completely out? */
 539         //if (page->index >= end_index+1 || !offset)
 540         //      return -EIO;
 541
 542         get_page(page);
 543
 544
 545         buffer = kmap(page);
 546
 547         obj = yaffs_InodeToObject(inode);
 548         yaffs_GrossLock(obj->myDev);
 549
 550
 551         nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes,0);
 552
 553         yaffs_GrossUnlock(obj->myDev);
 554
 555         kunmap(page);
 556         SetPageUptodate(page);
 557         UnlockPage(page);
 558         put_page(page);
 559
 560         return (nWritten == nBytes) ? 0  : -ENOSPC;
 561 }
 562
 563
 564
 565 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 566 {
 567
 568         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
 569         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 570                 return  yaffs_readpage_nolock(f,pg);
 571
 572         return 0;
 573
 574 }
 575
 576 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 577 {
 578
 579         void *addr = page_address(pg) + offset;
 580         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 581         int nBytes = to - offset;
 582         int nWritten;
 583
 584         unsigned spos = pos;
 585         unsigned saddr = (unsigned)addr;
 586
 587         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 588
 589         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 590
 591         if(nWritten != nBytes)
 592         {
 593                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 594                 SetPageError(pg);
 595                 ClearPageUptodate(pg);
 596         }
 597         else
 598         {
 599                 SetPageUptodate(pg);
 600         }
 601
 602         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 603
 604         return nWritten;
 605
 606 }
 607
 608
 609
 610 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 611 {
 612         if (inode && obj)
 613         {
 614                 inode->i_ino = obj->objectId;
 615                 inode->i_mode = obj->st_mode;
 616                 inode->i_uid = obj->st_uid;
 617                 inode->i_gid = obj->st_gid;
 618                 inode->i_blksize = inode->i_sb->s_blocksize;
 619 //#if defined(CONFIG_KERNEL_2_5)
 620 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 621
 622                 inode->i_rdev = old_decode_dev(obj->st_rdev);
 623                 inode->i_atime.tv_sec = (time_t)(obj->st_atime);
 624                 inode->i_atime.tv_nsec = 0;
 625                 inode->i_mtime.tv_sec = (time_t)obj->st_mtime;
 626                 inode->i_mtime.tv_nsec =0;
 627                 inode->i_ctime.tv_sec = (time_t)obj->st_ctime;
 628                 inode->i_ctime.tv_nsec = 0;
 629 #else
 630                 inode->i_rdev = obj->st_rdev;
 631                 inode->i_atime = obj->st_atime;
 632                 inode->i_mtime = obj->st_mtime;
 633                 inode->i_ctime = obj->st_ctime;
 634 #endif
 635                 inode->i_size = yaffs_GetObjectFileLength(obj);
 636                 inode->i_blocks = (inode->i_size + 511) >> 9;
 637
 638                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 639
 640                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 641                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 642
 643                 switch (obj->st_mode & S_IFMT)
 644                 {
 645                         default: // fifo, device or socket
 646 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 647                                init_special_inode(inode, obj->st_mode,old_decode_dev(obj->st_rdev));
 648 #else
 649                                  init_special_inode(inode, obj->st_mode,(dev_t)(obj->st_rdev));
 650 #endif                          break;
 651                         case S_IFREG:   // file
 652                                 inode->i_op = &yaffs_file_inode_operations;
 653                                 inode->i_fop = &yaffs_file_operations;
 654                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 655                                 break;
 656                         case S_IFDIR:   // directory
 657                                 inode->i_op = &yaffs_dir_inode_operations;
 658                                 inode->i_fop = &yaffs_dir_operations;
 659                                 break;
 660                         case S_IFLNK:   // symlink
 661                                 inode->i_op = &yaffs_symlink_inode_operations;
 662                                 break;
 663                 }
 664
 665
 666                 inode->u.generic_ip = obj;
 667                 obj->myInode = inode;
 668
 669         }
 670         else
 671         {
 672                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 673         }
 674
 675 }
 676
 677 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 678 {
 679         struct inode * inode;
 680
 681         if(!sb)
 682         {
 683           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL super_block!!\n"));
 684           return NULL;
 685
 686         }
 687
 688         if(!obj)
 689         {
 690           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL object!!\n"));
 691           return NULL;
 692
 693         }
 694
 695         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 696
 697         inode = iget(sb,obj->objectId);
 698
 699         // NB Side effect: iget calls back to yaffs_read_inode().
 700         // iget also increments the inode's i_count
 701
 702         return inode;
 703 }
 704
 705 #if 0
 706
 707 // No longer used because we use generic rw */
 708 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 709 {
 710         yaffs_Object *obj;
 711         int nRead,ipos;
 712         struct inode *inode;
 713         yaffs_Device *dev;
 714
 715         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n"));
 716
 717         obj  = yaffs_DentryToObject(f->f_dentry);
 718
 719         dev = obj->myDev;
 720
 721         yaffs_GrossLock(dev);
 722
 723         inode = f->f_dentry->d_inode;
 724
 725         if (*pos < inode->i_size)
 726         {
 727                         if (*pos + n > inode->i_size)
 728                         {
 729                                 n = inode->i_size - *pos;
 730                         }
 731         }
 732         else
 733         {
 734                 n = 0;
 735         }
 736
 737         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 738         if(nRead > 0)
 739         {
 740                 f->f_pos += nRead;
 741         }
 742
 743         yaffs_GrossUnlock(dev);
 744
 745         ipos = *pos;
 746
 747         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 748         return nRead;
 749
 750 }
 751
 752 #endif
 753
 754 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 755 {
 756         yaffs_Object *obj;
 757         int nWritten,ipos;
 758         struct inode *inode;
 759         yaffs_Device *dev;
 760
 761
 762         obj  = yaffs_DentryToObject(f->f_dentry);
 763
 764         dev = obj->myDev;
 765
 766         yaffs_GrossLock(dev);
 767
 768         inode = f->f_dentry->d_inode;
 769
 770         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 771         {
 772                 ipos = inode->i_size;
 773         }
 774         else
 775         {
 776                 ipos = *pos;
 777         }
 778
 779
 780         if(!obj)
 781         {
 782                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 783         }
 784         else
 785         {
 786                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write about to write writing %d bytes to object %d at %d\n",n,obj->objectId,ipos));
 787         }
 788
 789         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n,0);
 790
 791         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 792         if(nWritten > 0)
 793         {
 794                 ipos += nWritten;
 795                 *pos = ipos;
 796                 if(ipos > inode->i_size)
 797                 {
 798                         inode->i_size = ipos;
 799                         inode->i_blocks = (ipos + 511)>>9;
 800
 801                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 802                 }
 803
 804         }
 805         yaffs_GrossUnlock(dev);
 806
 807         return nWritten != n ? -ENOSPC : nWritten;
 808 }
 809
 810
 811
 812 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 813 {
 814         yaffs_Object *obj;
 815         yaffs_Device *dev;
 816         struct inode *inode = f->f_dentry->d_inode;
 817         unsigned long offset, curoffs;
 818         struct list_head *i;
 819         yaffs_Object *l;
 820
 821         char name[YAFFS_MAX_NAME_LENGTH +1];
 822
 823         obj =  yaffs_DentryToObject(f->f_dentry);
 824         dev = obj->myDev;
 825
 826         yaffs_GrossLock(dev);
 827
 828         offset = f->f_pos;
 829
 830         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 831
 832         if(offset == 0)
 833         {
 834         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 835                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 836                 {
 837                         goto out;
 838                 }
 839                 offset++;
 840                 f->f_pos++;
 841         }
 842         if(offset == 1)
 843         {
 844                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 845                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 846                 {
 847                         goto out;
 848                 }
 849                 offset++;
 850                 f->f_pos++;
 851         }
 852
 853         curoffs = 1;
 854
 855         list_for_each(i,&obj->variant.directoryVariant.children)
 856         {
 857                 curoffs++;
 858                 if(curoffs >= offset)
 859                 {
 860                         l = list_entry(i, yaffs_Object,siblings);
 861
 862                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 863                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 864
 865                         if(filldir(dirent,
 866                                            name,
 867                                            strlen(name),
 868                                            offset,
 869                                            yaffs_GetObjectInode(l),
 870                                            yaffs_GetObjectType(l))
 871                                            < 0)
 872                         {
 873                                 goto up_and_out;
 874                         }
 875
 876                         offset++;
 877                         f->f_pos++;
 878                 }
 879         }
 880
 881   up_and_out:
 882   out:
 883
 884     yaffs_GrossUnlock(dev);
 885
 886         return 0;
 887 }
 888
 889
 890 /*
 891  * File creation. Allocate an inode, and we're done..
 892  */
 893 //#if defined(CONFIG_KERNEL_2_5)
 894 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 895 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 896 #else
 897 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 898 #endif
 899 {
 900         struct inode *inode;
 901
 902         yaffs_Object *obj = NULL;
 903         yaffs_Device *dev;
 904
 905         yaffs_Object *parent = yaffs_InodeToObject(dir);
 906
 907         int error = -ENOSPC;
 908
 909         if(parent)
 910         {
 911                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 912                                          parent->objectId,parent->variantType));
 913         }
 914         else
 915         {
 916                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 917                 return -EPERM;
 918         }
 919
 920         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 921                                         dentry->d_name.name, mode,rdev));
 922
 923         dev = parent->myDev;
 924
 925         yaffs_GrossLock(dev);
 926
 927         switch (mode & S_IFMT)
 928         {
 929                 default:
 930                         // Special (socket, fifo, device...)
 931                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 932 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 933                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,old_encode_dev(rdev));
 934 #else
 935                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 936 #endif                  break;
 937                 case S_IFREG:   // file
 938                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 939                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 940                         break;
 941                 case S_IFDIR:   // directory
 942                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 943                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 944                         break;
 945                 case S_IFLNK:   // symlink
 946                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 947                         obj = NULL; // Do we ever get here?
 948                         break;
 949         }
 950
 951         if(obj)
 952         {
 953                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 954                 d_instantiate(dentry, inode);
 955                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 956                 error = 0;
 957         }
 958         else
 959         {
 960                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 961                 error = -ENOMEM;
 962         }
 963
 964         yaffs_GrossUnlock(dev);
 965
 966         return error;
 967 }
 968
 969 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 970 {
 971         int retVal;
 972         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 973         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 974 #if 0
 975  // attempt to fix dir bug - didn't work
 976         if(!retVal)
 977         {
 978                 dget(dentry);
 979         }
 980 #endif
 981         return retVal;
 982 }
 983
 984 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 985 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 986 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
 987 #else
 988 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 989 #endif
 990 {
 991         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
 992         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 993 }
 994
 995
 996 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 997 {
 998         int retVal;
 999
1000         yaffs_Device *dev;
1001
1002
1003         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
1004
1005         dev = yaffs_InodeToObject(dir)->myDev;
1006
1007         yaffs_GrossLock(dev);
1008
1009
1010         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
1011
1012
1013         yaffs_GrossUnlock(dev);
1014
1015         if( retVal == YAFFS_OK)
1016         {
1017                 dentry->d_inode->i_nlink--;
1018                 mark_inode_dirty(dentry->d_inode);
1019                 return 0;
1020         }
1021         else
1022         {
1023                 return -ENOTEMPTY;
1024         }
1025 }
1026
1027
1028 /*
1029  * Create a link...
1030  */
1031 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
1032 {
1033         struct inode *inode = old_dentry->d_inode;
1034         yaffs_Object *obj = NULL;
1035         yaffs_Object *link=NULL;
1036         yaffs_Device *dev;
1037
1038         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
1039
1040         obj = yaffs_InodeToObject(inode);
1041         dev = obj->myDev;
1042
1043         yaffs_GrossLock(dev);
1044
1045         if (!S_ISDIR(inode->i_mode))    // Don't link directories
1046         {
1047                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
1048         }
1049
1050
1051         if(link)
1052         {
1053                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
1054                 d_instantiate(dentry, old_dentry->d_inode);
1055                 atomic_inc(&old_dentry->d_inode->i_count);
1056                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
1057                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
1058
1059         }
1060
1061         yaffs_GrossUnlock(dev);
1062
1063
1064         if(link)
1065         {
1066
1067                 return 0;
1068         }
1069
1070
1071         return -EPERM;
1072 }
1073
1074
1075 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
1076 {
1077         yaffs_Object *obj;
1078         yaffs_Device *dev;
1079
1080         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
1081
1082         dev = yaffs_InodeToObject(dir)->myDev;
1083         yaffs_GrossLock(dev);
1084         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1085                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
1086                                                          symname);
1087         yaffs_GrossUnlock(dev);
1088
1089         if(obj)
1090         {
1091
1092                 struct inode* inode;
1093
1094                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode, 0, obj);
1095                 d_instantiate(dentry, inode);
1096                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
1097                 return 0;
1098         }
1099         else
1100         {
1101                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
1102
1103         }
1104
1105         return -ENOMEM;
1106 }
1107
1108 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
1109 {
1110
1111         yaffs_Object *obj;
1112         yaffs_Device *dev;
1113
1114         obj = yaffs_DentryToObject(dentry);
1115
1116         dev = obj->myDev;
1117
1118         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
1119         yaffs_GrossLock(dev);
1120         yaffs_FlushFile(obj,1);
1121         yaffs_GrossUnlock(dev);
1122         return 0;
1123 }
1124
1125 /*
1126  * The VFS layer already does all the dentry stuff for rename.
1127  *
1128  * NB: POSIX says you can rename an object over an old object of the same name
1129  */
1130 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1131 {
1132         yaffs_Device *dev;
1133         int retVal = YAFFS_FAIL;
1134         int removed = 0;
1135         yaffs_Object *target;
1136
1137         dev = yaffs_InodeToObject(old_dir)->myDev;
1138
1139         yaffs_GrossLock(dev);
1140
1141         // Check if the target is an existing directory that is not empty.
1142         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1143
1144         if(target &&
1145            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1146            !list_empty(&target->variant.directoryVariant.children))
1147         {
1148                 retVal = YAFFS_FAIL;
1149         }
1150         else
1151         {
1152
1153                 // Unlink the target if it exists
1154                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1155
1156
1157                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1158                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1159
1160         }
1161         yaffs_GrossUnlock(dev);
1162
1163         if(retVal == YAFFS_OK)
1164         {
1165                 if(removed == YAFFS_OK)
1166                 {
1167                         new_dentry->d_inode->i_nlink--;
1168                         mark_inode_dirty(new_dentry->d_inode);
1169                 }
1170
1171                 return 0;
1172         }
1173         else
1174         {
1175                 return -ENOTEMPTY;
1176         }
1177
1178
1179 }
1180
1181 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1182 {
1183         struct inode *inode = dentry->d_inode;
1184         int error;
1185         yaffs_Device *dev;
1186
1187         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1188
1189         if((error = inode_change_ok(inode,attr)) == 0)
1190         {
1191
1192                 dev = yaffs_InodeToObject(inode)->myDev;
1193                 yaffs_GrossLock(dev);
1194                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1195                 {
1196                         error = 0;
1197                 }
1198                 else
1199                 {
1200                         error = -EPERM;
1201                 }
1202                 yaffs_GrossUnlock(dev);
1203                 inode_setattr(inode,attr);
1204         }
1205         return error;
1206 }
1207
1208 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
1209 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1210 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1211 #else
1212 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1213 #endif
1214 {
1215
1216
1217         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1218         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1219
1220         yaffs_GrossLock(dev);
1221
1222
1223         buf->f_type = YAFFS_MAGIC;
1224         buf->f_bsize = sb->s_blocksize;
1225         buf->f_namelen = 255;
1226         if(sb->s_blocksize > dev->nBytesPerChunk)
1227         {
1228
1229                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock/
1230                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1231                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1232                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1233         }
1234         else
1235         {
1236
1237                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock *
1238                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1239                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev) *
1240                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1241         }
1242         buf->f_files = 0;
1243         buf->f_ffree = 0;
1244         buf->f_bavail =  buf->f_bfree;
1245
1246         yaffs_GrossUnlock(dev);
1247         return 0;
1248 }
1249
1250 static void yaffs_read_inode (struct inode *inode)
1251 {
1252         // NB This is called as a side effect of other functions and
1253         // thus gross locking should always be in place already.
1254
1255         yaffs_Object *obj ;
1256         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1257
1258         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1259
1260         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1261
1262         yaffs_FillInodeFromObject(inode,obj);
1263
1264 }
1265
1266
1267
1268 // Todo
1269 // Currently we only can report a single partition. Need to use lists here
1270 static yaffs_Device *yaffs_dev;
1271 static yaffs_Device *yaffsram_dev;
1272
1273
1274
1275 static void yaffs_put_super(struct super_block *sb)
1276 {
1277         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1278
1279         yaffs_GrossLock(dev);
1280         if(dev->putSuperFunc)
1281         {
1282                  dev->putSuperFunc(sb);
1283         }
1284         yaffs_Deinitialise(dev);
1285         yaffs_GrossUnlock(dev);
1286
1287         if(dev == yaffs_dev) yaffs_dev = NULL;
1288         if(dev == yaffsram_dev) yaffsram_dev = NULL;
1289
1290         kfree(dev);
1291 }
1292
1293
1294 #ifdef CONFIG_YAFFS_MTD_ENABLED
1295
1296 static void  yaffs_MTDPutSuper(struct super_block *sb)
1297 {
1298
1299         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1300
1301         if(mtd->sync)
1302         {
1303                 mtd->sync(mtd);
1304         }
1305
1306         put_mtd_device(mtd);
1307 }
1308
1309 #endif
1310
1311
1312 static struct super_block *yaffs_internal_read_super(int yaffsVersion,int useRam, struct super_block * sb, void * data, int silent)
1313 {
1314         int nBlocks;
1315         struct inode * inode = NULL;
1316         struct dentry * root;
1317         yaffs_Device *dev;
1318         int err;
1319
1320         sb->s_magic = YAFFS_MAGIC;
1321         sb->s_op = &yaffs_super_ops;
1322
1323         if(!sb)
1324                 printk(KERN_INFO"yaffs: sb is NULL\n");
1325         else if(!sb->s_dev)
1326                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1327         else if(! kdevname(sb->s_dev))
1328                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1329         else
1330                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1331
1332
1333
1334 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1335         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1336         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1337 #else
1338         sb->s_blocksize = PAGE_CACHE_SIZE;
1339         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1340 #endif
1341         T(YAFFS_TRACE_OS,("yaffs_read_super: Using yaffs%d\n",yaffsVersion));
1342         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1343
1344 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1345         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1346 #endif
1347
1348
1349
1350         if(useRam)
1351         {
1352
1353 #ifdef CONFIG_YAFFS_RAM_ENABLED
1354                 // Set the yaffs_Device up for ram emulation
1355
1356                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1357                 if(!dev)
1358                 {
1359                         // Deep shit could not allocate device structure
1360                         T(YAFFS_TRACE_OS,("yaffs_read_super: Failed trying to allocate yaffs_Device.\n"));
1361                         return NULL;
1362                 }
1363
1364                 memset(dev,0,sizeof(yaffs_Device));
1365                 dev->genericDevice = NULL; // Not used for RAM emulation.
1366
1367                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1368                 dev->startBlock = 1;  // Don't use block 0
1369                 dev->endBlock = nBlocks - 1;
1370                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1371                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1372                 dev->nReservedBlocks = 5;
1373
1374                 if(yaffsVersion == 2)
1375                 {
1376                         dev->writeChunkWithTagsToNAND  = nandemul2k_WriteChunkWithTagsToNAND;
1377                         dev->readChunkWithTagsFromNAND = nandemul2k_ReadChunkWithTagsFromNAND;
1378                         dev->markNANDBlockBad          = nandemul2k_MarkNANDBlockBad;
1379                         dev->queryNANDBlock            = nandemul2k_QueryNANDBlock;
1380                         dev->eraseBlockInNAND          = nandemul2k_EraseBlockInNAND;
1381                         dev->initialiseNAND            = nandemul2k_InitialiseNAND;
1382                         dev->isYaffs2 = 1;
1383                         dev->nChunksPerBlock = nandemul2k_GetChunksPerBlock();
1384                         dev->nBytesPerChunk =  nandemul2k_GetBytesPerChunk();;
1385                         nBlocks = nandemul2k_GetNumberOfBlocks();
1386                         dev->startBlock = 1;  // Don't use block 0
1387                         dev->endBlock = nBlocks - 1;
1388                 }
1389                 else
1390                 {
1391                         dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1392                         dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1393                         dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1394                         dev->initialiseNAND = nandemul_InitialiseNAND;
1395                         dev->isYaffs2 = 0;
1396                 }
1397
1398                 yaffsram_dev = dev;
1399
1400 #endif
1401
1402         }
1403         else
1404         {
1405 #ifdef CONFIG_YAFFS_MTD_ENABLED
1406                 struct mtd_info *mtd;
1407
1408                 T(YAFFS_TRACE_ALWAYS,("yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1409                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev)));
1410
1411                 // Check it's an mtd device.....
1412                 if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1413                 {
1414                         return NULL; // This isn't an mtd device
1415                 }
1416
1417                 // Get the device
1418                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1419                 if (!mtd)
1420                 {
1421                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev)));
1422                         return NULL;
1423                 }
1424
1425                 // Check it's NAND
1426                 if(mtd->type != MTD_NANDFLASH)
1427                 {
1428                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1429                         return NULL;
1430                 }
1431
1432                 T(YAFFS_TRACE_OS,(" erase %x\n",mtd->erase));
1433                 T(YAFFS_TRACE_OS,(" read %x\n",mtd->read));
1434                 T(YAFFS_TRACE_OS,(" write %x\n",mtd->write));
1435                 T(YAFFS_TRACE_OS,(" readoob %x\n",mtd->read_oob));
1436                 T(YAFFS_TRACE_OS,(" writeoob %x\n",mtd->write_oob));
1437                 T(YAFFS_TRACE_OS,(" block_isbad %x\n",mtd->block_isbad));
1438                 T(YAFFS_TRACE_OS,(" block_markbad %x\n",mtd->block_markbad));
1439                 T(YAFFS_TRACE_OS,(" oobblock %d\n",mtd->oobblock));
1440                 T(YAFFS_TRACE_OS,(" oobsize %d\n",mtd->oobsize));
1441                 T(YAFFS_TRACE_OS,(" erasesize %d\n",mtd->erasesize));
1442                 T(YAFFS_TRACE_OS,(" size %d\n",mtd->size));
1443
1444                 if(yaffsVersion == 2)
1445                 {
1446                         // Check for version 2 style functions
1447                         if(!mtd->erase ||
1448                            !mtd->block_isbad ||
1449                            !mtd->block_markbad ||
1450                            !mtd->read  ||
1451                            !mtd->write ||
1452 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1453                            !mtd->write_ecc ||
1454                            !mtd->read_ecc ||
1455 #endif
1456                            !mtd->read_oob ||
1457                            !mtd->write_oob )
1458                         {
1459                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1460                                 return NULL;
1461                         }
1462
1463                         if(mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1464                            mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE)
1465                         {
1466                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1467                                 return NULL;
1468                         }               }
1469                 else
1470                 {
1471                         // Check for V1 style functions
1472                         if(!mtd->erase ||
1473                            !mtd->read  ||
1474                            !mtd->write ||
1475 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1476                            !mtd->write_ecc ||
1477                            !mtd->read_ecc ||
1478 #endif
1479                            !mtd->read_oob ||
1480                            !mtd->write_oob )
1481                         {
1482                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1483                                 return NULL;
1484                         }
1485
1486                         if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1487                            mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1488                         {
1489                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1490                                 return NULL;
1491                         }
1492                 }
1493
1494
1495                         // OK, so if we got here, we have an MTD that's NAND and looks
1496                         // like it has the right capabilities
1497                         // Set the yaffs_Device up for mtd
1498
1499 //#if defined(CONFIG_KERNEL_2_5)
1500 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1501                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1502 #else
1503                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1504 #endif
1505                 if(!dev)
1506                 {
1507                         // Deep shit could not allocate device structure
1508                         T(YAFFS_TRACE_ALWAYS,("yaffs_read_super: Failed trying to allocate yaffs_Device. \n"));
1509                         return NULL;
1510                 }
1511
1512                 memset(dev,0,sizeof(yaffs_Device));
1513                 dev->genericDevice = mtd;
1514
1515                 // Set up the memory size parameters....
1516
1517                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1518                 dev->startBlock = 1;  // Don't use block 0
1519                 dev->endBlock = nBlocks - 1;
1520                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1521                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1522                 dev->nReservedBlocks = 5;
1523                 dev->nShortOpCaches = 10; // Enable short op caching
1524
1525
1526                 // ... and the functions.
1527                 if(yaffsVersion == 2)
1528                 {
1529                         dev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND;
1530                         dev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND;
1531                         dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1532                         dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1533                         dev->spareBuffer = YMALLOC(mtd->oobsize);
1534                         dev->isYaffs2 = 1;
1535                         dev->nBytesPerChunk = mtd->oobblock;
1536                         dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1537                         nBlocks = mtd->size / mtd->erasesize;
1538                         dev->startBlock = 1;  // Don't use block 0
1539                         dev->endBlock = nBlocks - 1;
1540                 }
1541                 else
1542                 {
1543                         dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1544                         dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1545                         dev->isYaffs2 = 0;
1546                 }
1547                 // ... and common functions
1548                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1549                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1550
1551                 dev->putSuperFunc = yaffs_MTDPutSuper;
1552
1553 #ifdef CONFIG_YAFFS_USE_NANDECC
1554                 dev->useNANDECC = 1;
1555 #endif
1556
1557                 yaffs_dev = dev;
1558
1559 #endif
1560         }
1561
1562         init_MUTEX(&dev->grossLock);
1563
1564
1565         yaffs_GrossLock(dev);
1566
1567         err = yaffs_GutsInitialise(dev);
1568
1569         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised %s\n", (err == YAFFS_OK) ? "OK" : "FAILED"));
1570
1571         // Create root inode
1572         if(err == YAFFS_OK)
1573           inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(dev));
1574
1575         yaffs_GrossUnlock(dev);
1576
1577         if (!inode)
1578                 return NULL;
1579
1580 // added NCB
1581         inode->i_op = & yaffs_dir_inode_operations;
1582         inode->i_fop = & yaffs_dir_operations;
1583
1584         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1585
1586
1587         root = d_alloc_root(inode);
1588
1589         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1590
1591         if (!root) {
1592                 iput(inode);
1593                 return NULL;
1594         }
1595         sb->s_root = root;
1596
1597         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1598         return sb;
1599 }
1600
1601
1602 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1603 {
1604          return yaffs_internal_read_super(1,1,sb,data,silent) ? 0 : -1;
1605 }
1606 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1607 {
1608          return yaffs_internal_read_super(1,0,sb,data,silent) ? 0 : -1;
1609 }
1610
1611 static int yaffs2_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1612 {
1613          return yaffs_internal_read_super(2,1,sb,data,silent) ? 0 : -1;
1614 }
1615 static int yaffs2_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1616 {
1617          return yaffs_internal_read_super(2,0,sb,data,silent) ? 0 : -1;
1618 }
1619
1620
1621
1622 #ifdef CONFIG_YAFFS_MTD_ENABLED
1623 //#if defined(CONFIG_KERNEL_2_5)
1624 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1625 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1626 {
1627
1628     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1629 }
1630
1631 /* changes NCB 2.5.70 */
1632 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1633 static struct file_system_type yaffs_fs_type = {
1634         .owner          = THIS_MODULE,
1635         .name           = "yaffs",
1636         .get_sb         = yaffs_read_super,
1637         .kill_sb        = kill_block_super,
1638 //      .kill_sb        = kill_litter_super,
1639         .fs_flags       = FS_REQUIRES_DEV,
1640 };
1641 #else
1642 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1643 {
1644         return yaffs_internal_read_super(1,0,sb,data,silent);
1645 }
1646
1647 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1648 #endif
1649
1650 #endif // CONFIG_YAFFS_MTD_ENABLED
1651
1652 #ifdef CONFIG_YAFFS2_MTD_ENABLED
1653
1654 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1655 static struct super_block *yaffs2_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1656 {
1657
1658     return get_sb_bdev(fs, flags, dev_name, data, yaffs2_internal_read_super_mtd);
1659 }
1660
1661 /* changes NCB 2.5.70 */
1662 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1663 static struct file_system_type yaffs2_fs_type = {
1664         .owner          = THIS_MODULE,
1665         .name           = "yaffs2",
1666         .get_sb         = yaffs2_read_super,
1667         .kill_sb        = kill_block_super,
1668 //      .kill_sb        = kill_litter_super,
1669         .fs_flags       = FS_REQUIRES_DEV,
1670 };
1671 #else
1672 static struct super_block *yaffs2_read_super(struct super_block * sb, void * data, int silent)
1673 {
1674         return yaffs_internal_read_super(2,0,sb,data,silent);
1675 }
1676
1677 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, FS_REQUIRES_DEV);
1678 #endif
1679
1680 #endif // CONFIG_YAFFS2_MTD_ENABLED
1681
1682
1683 #ifdef CONFIG_YAFFS_RAM_ENABLED
1684
1685 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1686 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1687 {
1688
1689     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_ram);
1690 }
1691
1692
1693 static struct file_system_type yaffs_ram_fs_type = {
1694         .owner          = THIS_MODULE,
1695         .name           = "yaffsram",
1696         .get_sb         = yaffs_ram_read_super,
1697         .kill_sb        = kill_block_super,
1698 //      .kill_sb        = kill_litter_super,
1699         .fs_flags       = FS_SINGLE,
1700 };
1701 #else
1702 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1703 {
1704         return yaffs_internal_read_super(1,1,sb,data,silent);
1705 }
1706
1707 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1708 #endif
1709
1710 #endif // CONFIG_YAFFS_RAM_ENABLED
1711
1712 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1713
1714 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1715 static struct super_block *yaffs2_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1716 {
1717
1718     return get_sb_bdev(fs, flags, dev_name, data, yaffs2_internal_read_super_ram);
1719 }
1720
1721
1722 static struct file_system_type yaffs2_ram_fs_type = {
1723         .owner          = THIS_MODULE,
1724         .name           = "yaffs2ram",
1725         .get_sb         = yaffs2_ram_read_super,
1726         .kill_sb        = kill_block_super,
1727 //      .kill_sb        = kill_litter_super,
1728         .fs_flags       = FS_SINGLE,
1729 };
1730 #else
1731 static struct super_block *yaffs2_ram_read_super(struct super_block * sb, void * data, int silent)
1732 {
1733         return yaffs_internal_read_super(2,1,sb,data,silent);
1734 }
1735
1736 static DECLARE_FSTYPE(yaffs2_ram_fs_type, "yaffs2ram", yaffs2_ram_read_super, FS_SINGLE);
1737 #endif
1738
1739 #endif // CONFIG_YAFFS2_RAM_ENABLED
1740
1741
1742
1743 static struct proc_dir_entry *my_proc_entry;
1744 static struct proc_dir_entry *my_proc_ram_write_entry;
1745
1746 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
1747 {
1748         buf +=sprintf(buf,"\nDevice %s\n",name);
1749         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1750         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1751         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1752         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1753         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1754         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1755         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1756         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1757         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1758         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1759         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1760         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1761         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1762         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1763         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1764         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1765         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1766         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1767         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1768         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1769         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1770         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1771         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1772         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1773         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1774         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1775         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1776         buf +=sprintf(buf,"isYaffs2........... %d\n",dev->isYaffs2);
1777
1778
1779         return buf;
1780 }
1781
1782 static int  yaffs_proc_read(
1783         char *page,
1784         char **start,
1785         off_t offset,
1786         int count,
1787         int *eof,
1788         void *data
1789         )
1790 {
1791
1792         char my_buffer[3000];
1793         char *buf;
1794         buf = my_buffer;
1795
1796         if (offset > 0) return 0;
1797
1798         /* Fill the buffer and get its length */
1799         buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
1800
1801         if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
1802         if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
1803
1804
1805         strcpy(page,my_buffer);
1806         return strlen(my_buffer);
1807 }
1808
1809
1810 static int  yaffs_proc_ram_write(
1811         char *page,
1812         char **start,
1813         off_t offset,
1814         int count,
1815         int *eof,
1816         void *data
1817         )
1818 {
1819
1820         printk(KERN_DEBUG "yaffs write size %d\n",count);
1821         return count;
1822 }
1823
1824
1825
1826 // Stuff to handle installation of file systems
1827 struct file_system_to_install
1828 {
1829    struct file_system_type *fst;
1830    int installed;
1831 };
1832
1833 static struct file_system_to_install fs_to_install[] =
1834 {
1835 #ifdef CONFIG_YAFFS_RAM_ENABLED
1836      { &yaffs_ram_fs_type, 0},
1837 #endif
1838 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1839      { &yaffs2_ram_fs_type,0},
1840 #endif
1841 #ifdef CONFIG_YAFFS_MTD_ENABLED
1842      { &yaffs_fs_type,0},
1843 #endif
1844 #ifdef CONFIG_YAFFS2_MTD_ENABLED
1845      { &yaffs2_fs_type,0},
1846 #endif
1847      { NULL,0}
1848 };
1849
1850 static int __init init_yaffs_fs(void)
1851 {
1852         int error = 0;
1853         struct file_system_to_install *fsinst;
1854
1855         yaffs_dev = yaffsram_dev = NULL;
1856
1857    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
1858
1859
1860
1861     /* Install the proc_fs entry */
1862     my_proc_entry = create_proc_read_entry("yaffs",
1863                                            S_IRUGO | S_IFREG,
1864                                            &proc_root,
1865                                            yaffs_proc_read,
1866                                            NULL);
1867     if(!my_proc_entry)
1868     {
1869        return -ENOMEM;
1870     }
1871
1872
1873
1874     // Now add the file system entries
1875
1876     fsinst = fs_to_install;
1877
1878     while(fsinst->fst && !error)
1879     {
1880       error = register_filesystem(fsinst->fst);
1881       if(!error)
1882       {
1883           fsinst->installed = 1;
1884       }
1885       fsinst++;
1886     }
1887
1888     // Any errors? uninstall
1889     if(error)
1890     {
1891             fsinst = fs_to_install;
1892
1893             while(fsinst->fst)
1894             {
1895               if(fsinst->installed)
1896               {
1897                 unregister_filesystem(fsinst->fst);
1898                 fsinst->installed = 0;
1899               }
1900               fsinst++;
1901             }
1902     }
1903
1904     return error;
1905 }
1906
1907 static void __exit exit_yaffs_fs(void)
1908 {
1909
1910    struct file_system_to_install *fsinst;
1911
1912    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " removing. \n"));
1913
1914    remove_proc_entry("yaffs",&proc_root);
1915
1916     fsinst = fs_to_install;
1917
1918     while(fsinst->fst)
1919     {
1920       if(fsinst->installed)
1921       {
1922         unregister_filesystem(fsinst->fst);
1923         fsinst->installed = 0;
1924       }
1925       fsinst++;
1926     }
1927
1928 }
1929
1930 module_init(init_yaffs_fs)
1931 module_exit(exit_yaffs_fs)
1932
1933 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
1934 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002,2003,2004");
1935 MODULE_LICENSE("GPL");
1936
1937