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 1.2 2005-03-16 04:00:36 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);
 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                                 init_special_inode(inode, obj->st_mode,(dev_t)(obj->st_rdev));
 647                                 break;
 648                         case S_IFREG:   // file
 649                                 inode->i_op = &yaffs_file_inode_operations;
 650                                 inode->i_fop = &yaffs_file_operations;
 651                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 652                                 break;
 653                         case S_IFDIR:   // directory
 654                                 inode->i_op = &yaffs_dir_inode_operations;
 655                                 inode->i_fop = &yaffs_dir_operations;
 656                                 break;
 657                         case S_IFLNK:   // symlink
 658                                 inode->i_op = &yaffs_symlink_inode_operations;
 659                                 break;
 660                 }
 661
 662
 663                 inode->u.generic_ip = obj;
 664                 obj->myInode = inode;
 665
 666         }
 667         else
 668         {
 669                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 670         }
 671
 672 }
 673
 674 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 675 {
 676         struct inode * inode;
 677
 678         if(!sb)
 679         {
 680           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL super_block!!\n"));
 681           return NULL;
 682
 683         }
 684
 685         if(!obj)
 686         {
 687           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL object!!\n"));
 688           return NULL;
 689
 690         }
 691
 692         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 693
 694         inode = iget(sb,obj->objectId);
 695
 696         // NB Side effect: iget calls back to yaffs_read_inode().
 697         // iget also increments the inode's i_count
 698
 699         return inode;
 700 }
 701
 702 #if 0
 703
 704 // No longer used because we use generic rw */
 705 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 706 {
 707         yaffs_Object *obj;
 708         int nRead,ipos;
 709         struct inode *inode;
 710         yaffs_Device *dev;
 711
 712         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n"));
 713
 714         obj  = yaffs_DentryToObject(f->f_dentry);
 715
 716         dev = obj->myDev;
 717
 718         yaffs_GrossLock(dev);
 719
 720         inode = f->f_dentry->d_inode;
 721
 722         if (*pos < inode->i_size)
 723         {
 724                         if (*pos + n > inode->i_size)
 725                         {
 726                                 n = inode->i_size - *pos;
 727                         }
 728         }
 729         else
 730         {
 731                 n = 0;
 732         }
 733
 734         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 735         if(nRead > 0)
 736         {
 737                 f->f_pos += nRead;
 738         }
 739
 740         yaffs_GrossUnlock(dev);
 741
 742         ipos = *pos;
 743
 744         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 745         return nRead;
 746
 747 }
 748
 749 #endif
 750
 751 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 752 {
 753         yaffs_Object *obj;
 754         int nWritten,ipos;
 755         struct inode *inode;
 756         yaffs_Device *dev;
 757
 758
 759         obj  = yaffs_DentryToObject(f->f_dentry);
 760
 761         dev = obj->myDev;
 762
 763         yaffs_GrossLock(dev);
 764
 765         inode = f->f_dentry->d_inode;
 766
 767         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 768         {
 769                 ipos = inode->i_size;
 770         }
 771         else
 772         {
 773                 ipos = *pos;
 774         }
 775
 776
 777         if(!obj)
 778         {
 779                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 780         }
 781         else
 782         {
 783                 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));
 784         }
 785
 786         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n);
 787
 788         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 789         if(nWritten > 0)
 790         {
 791                 ipos += nWritten;
 792                 *pos = ipos;
 793                 if(ipos > inode->i_size)
 794                 {
 795                         inode->i_size = ipos;
 796                         inode->i_blocks = (ipos + 511)>>9;
 797
 798                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 799                 }
 800
 801         }
 802         yaffs_GrossUnlock(dev);
 803
 804         return nWritten != n ? -ENOSPC : nWritten;
 805 }
 806
 807
 808
 809 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 810 {
 811         yaffs_Object *obj;
 812         yaffs_Device *dev;
 813         struct inode *inode = f->f_dentry->d_inode;
 814         unsigned long offset, curoffs;
 815         struct list_head *i;
 816         yaffs_Object *l;
 817
 818         char name[YAFFS_MAX_NAME_LENGTH +1];
 819
 820         obj =  yaffs_DentryToObject(f->f_dentry);
 821         dev = obj->myDev;
 822
 823         yaffs_GrossLock(dev);
 824
 825         offset = f->f_pos;
 826
 827         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 828
 829         if(offset == 0)
 830         {
 831         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 832                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 833                 {
 834                         goto out;
 835                 }
 836                 offset++;
 837                 f->f_pos++;
 838         }
 839         if(offset == 1)
 840         {
 841                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 842                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 843                 {
 844                         goto out;
 845                 }
 846                 offset++;
 847                 f->f_pos++;
 848         }
 849
 850         curoffs = 1;
 851
 852         list_for_each(i,&obj->variant.directoryVariant.children)
 853         {
 854                 curoffs++;
 855                 if(curoffs >= offset)
 856                 {
 857                         l = list_entry(i, yaffs_Object,siblings);
 858
 859                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 860                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 861
 862                         if(filldir(dirent,
 863                                            name,
 864                                            strlen(name),
 865                                            offset,
 866                                            yaffs_GetObjectInode(l),
 867                                            yaffs_GetObjectType(l))
 868                                            < 0)
 869                         {
 870                                 goto up_and_out;
 871                         }
 872
 873                         offset++;
 874                         f->f_pos++;
 875                 }
 876         }
 877
 878   up_and_out:
 879   out:
 880
 881     yaffs_GrossUnlock(dev);
 882
 883         return 0;
 884 }
 885
 886
 887 /*
 888  * File creation. Allocate an inode, and we're done..
 889  */
 890 //#if defined(CONFIG_KERNEL_2_5)
 891 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 892 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 893 #else
 894 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 895 #endif
 896 {
 897         struct inode *inode;
 898
 899         yaffs_Object *obj = NULL;
 900         yaffs_Device *dev;
 901
 902         yaffs_Object *parent = yaffs_InodeToObject(dir);
 903
 904         int error = -ENOSPC;
 905
 906         if(parent)
 907         {
 908                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 909                                          parent->objectId,parent->variantType));
 910         }
 911         else
 912         {
 913                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 914                 return -EPERM;
 915         }
 916
 917         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 918                                         dentry->d_name.name, mode,rdev));
 919
 920         dev = parent->myDev;
 921
 922         yaffs_GrossLock(dev);
 923
 924         switch (mode & S_IFMT)
 925         {
 926                 default:
 927                         // Special (socket, fifo, device...)
 928                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 929                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 930                         break;
 931                 case S_IFREG:   // file
 932                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 933                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 934                         break;
 935                 case S_IFDIR:   // directory
 936                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 937                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 938                         break;
 939                 case S_IFLNK:   // symlink
 940                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 941                         obj = NULL; // Do we ever get here?
 942                         break;
 943         }
 944
 945         if(obj)
 946         {
 947                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 948                 d_instantiate(dentry, inode);
 949                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 950                 error = 0;
 951         }
 952         else
 953         {
 954                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 955                 error = -ENOMEM;
 956         }
 957
 958         yaffs_GrossUnlock(dev);
 959
 960         return error;
 961 }
 962
 963 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 964 {
 965         int retVal;
 966         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 967         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 968 #if 0
 969  // attempt to fix dir bug - didn't work
 970         if(!retVal)
 971         {
 972                 dget(dentry);
 973         }
 974 #endif
 975         return retVal;
 976 }
 977
 978 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 979 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 980 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
 981 #else
 982 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 983 #endif
 984 {
 985         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
 986         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 987 }
 988
 989
 990 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 991 {
 992         int retVal;
 993
 994         yaffs_Device *dev;
 995
 996
 997         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
 998
 999         dev = yaffs_InodeToObject(dir)->myDev;
1000
1001         yaffs_GrossLock(dev);
1002
1003
1004         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
1005
1006
1007         yaffs_GrossUnlock(dev);
1008
1009         if( retVal == YAFFS_OK)
1010         {
1011                 dentry->d_inode->i_nlink--;
1012                 mark_inode_dirty(dentry->d_inode);
1013                 return 0;
1014         }
1015         else
1016         {
1017                 return -ENOTEMPTY;
1018         }
1019 }
1020
1021
1022 /*
1023  * Create a link...
1024  */
1025 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
1026 {
1027         struct inode *inode = old_dentry->d_inode;
1028         yaffs_Object *obj = NULL;
1029         yaffs_Object *link=NULL;
1030         yaffs_Device *dev;
1031
1032         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
1033
1034         obj = yaffs_InodeToObject(inode);
1035         dev = obj->myDev;
1036
1037         yaffs_GrossLock(dev);
1038
1039         if (!S_ISDIR(inode->i_mode))    // Don't link directories
1040         {
1041                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
1042         }
1043
1044
1045         if(link)
1046         {
1047                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
1048                 d_instantiate(dentry, old_dentry->d_inode);
1049                 atomic_inc(&old_dentry->d_inode->i_count);
1050                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
1051                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
1052
1053         }
1054
1055         yaffs_GrossUnlock(dev);
1056
1057
1058         if(link)
1059         {
1060
1061                 return 0;
1062         }
1063
1064
1065         return -EPERM;
1066 }
1067
1068
1069 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
1070 {
1071         yaffs_Object *obj;
1072         yaffs_Device *dev;
1073
1074         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
1075
1076         dev = yaffs_InodeToObject(dir)->myDev;
1077         yaffs_GrossLock(dev);
1078         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1079                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
1080                                                          symname);
1081         yaffs_GrossUnlock(dev);
1082
1083         if(obj)
1084         {
1085
1086                 struct inode* inode;
1087
1088                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode, 0, obj);
1089                 d_instantiate(dentry, inode);
1090                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
1091                 return 0;
1092         }
1093         else
1094         {
1095                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
1096
1097         }
1098
1099         return -ENOMEM;
1100 }
1101
1102 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
1103 {
1104
1105         yaffs_Object *obj;
1106         yaffs_Device *dev;
1107
1108         obj = yaffs_DentryToObject(dentry);
1109
1110         dev = obj->myDev;
1111
1112         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
1113         yaffs_GrossLock(dev);
1114         yaffs_FlushFile(obj,1);
1115         yaffs_GrossUnlock(dev);
1116         return 0;
1117 }
1118
1119 /*
1120  * The VFS layer already does all the dentry stuff for rename.
1121  *
1122  * NB: POSIX says you can rename an object over an old object of the same name
1123  */
1124 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1125 {
1126         yaffs_Device *dev;
1127         int retVal = YAFFS_FAIL;
1128         int removed = 0;
1129         yaffs_Object *target;
1130
1131         dev = yaffs_InodeToObject(old_dir)->myDev;
1132
1133         yaffs_GrossLock(dev);
1134
1135         // Check if the target is an existing directory that is not empty.
1136         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1137
1138         if(target &&
1139            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1140            !list_empty(&target->variant.directoryVariant.children))
1141         {
1142                 retVal = YAFFS_FAIL;
1143         }
1144         else
1145         {
1146
1147                 // Unlink the target if it exists
1148                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1149
1150
1151                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1152                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1153
1154         }
1155         yaffs_GrossUnlock(dev);
1156
1157         if(retVal == YAFFS_OK)
1158         {
1159                 if(removed == YAFFS_OK)
1160                 {
1161                         new_dentry->d_inode->i_nlink--;
1162                         mark_inode_dirty(new_dentry->d_inode);
1163                 }
1164
1165                 return 0;
1166         }
1167         else
1168         {
1169                 return -ENOTEMPTY;
1170         }
1171
1172
1173 }
1174
1175 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1176 {
1177         struct inode *inode = dentry->d_inode;
1178         int error;
1179         yaffs_Device *dev;
1180
1181         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1182
1183         if((error = inode_change_ok(inode,attr)) == 0)
1184         {
1185
1186                 dev = yaffs_InodeToObject(inode)->myDev;
1187                 yaffs_GrossLock(dev);
1188                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1189                 {
1190                         error = 0;
1191                 }
1192                 else
1193                 {
1194                         error = -EPERM;
1195                 }
1196                 yaffs_GrossUnlock(dev);
1197                 inode_setattr(inode,attr);
1198         }
1199         return error;
1200 }
1201
1202 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
1203 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1204 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1205 #else
1206 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1207 #endif
1208 {
1209         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1210         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1211
1212         yaffs_GrossLock(dev);
1213
1214         buf->f_type = YAFFS_MAGIC;
1215         buf->f_bsize = sb->s_blocksize;
1216         buf->f_namelen = 255;
1217         buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * YAFFS_CHUNKS_PER_BLOCK/
1218                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1219         buf->f_files = 0;
1220         buf->f_ffree = 0;
1221         buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1222                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1223         buf->f_bavail =  buf->f_bfree;
1224
1225         yaffs_GrossUnlock(dev);
1226         return 0;
1227 }
1228
1229 static void yaffs_read_inode (struct inode *inode)
1230 {
1231         // NB This is called as a side effect of other functions and
1232         // thus gross locking should always be in place already.
1233
1234         yaffs_Object *obj ;
1235         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1236
1237         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1238
1239         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1240
1241         yaffs_FillInodeFromObject(inode,obj);
1242
1243 }
1244
1245
1246
1247 // Todo
1248 // Currently we only can report a single partition. Need to use lists here
1249 static yaffs_Device *yaffs_dev;
1250 static yaffs_Device *yaffsram_dev;
1251
1252
1253
1254 static void yaffs_put_super(struct super_block *sb)
1255 {
1256         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1257
1258         yaffs_GrossLock(dev);
1259         if(dev->putSuperFunc)
1260         {
1261                  dev->putSuperFunc(sb);
1262         }
1263         yaffs_Deinitialise(dev);
1264         yaffs_GrossUnlock(dev);
1265
1266         if(dev == yaffs_dev) yaffs_dev = NULL;
1267         if(dev == yaffsram_dev) yaffsram_dev = NULL;
1268
1269         kfree(dev);
1270 }
1271
1272
1273 #ifdef CONFIG_YAFFS_MTD_ENABLED
1274
1275 static void  yaffs_MTDPutSuper(struct super_block *sb)
1276 {
1277
1278         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1279
1280         if(mtd->sync)
1281         {
1282                 mtd->sync(mtd);
1283         }
1284
1285         put_mtd_device(mtd);
1286 }
1287
1288 #endif
1289
1290
1291 static struct super_block *yaffs_internal_read_super(int yaffsVersion,int useRam, struct super_block * sb, void * data, int silent)
1292 {
1293         int nBlocks;
1294         struct inode * inode = NULL;
1295         struct dentry * root;
1296         yaffs_Device *dev;
1297         int err;
1298
1299         sb->s_magic = YAFFS_MAGIC;
1300         sb->s_op = &yaffs_super_ops;
1301
1302         if(!sb)
1303                 printk(KERN_INFO"yaffs: sb is NULL\n");
1304         else if(!sb->s_dev)
1305                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1306         else if(! kdevname(sb->s_dev))
1307                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1308         else
1309                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1310
1311
1312
1313 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1314         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1315         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1316 #else
1317         sb->s_blocksize = PAGE_CACHE_SIZE;
1318         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1319 #endif
1320         T(YAFFS_TRACE_OS,("yaffs_read_super: Using yaffs%d\n",yaffsVersion));
1321         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1322
1323 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1324         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1325 #endif
1326
1327
1328
1329         if(useRam)
1330         {
1331
1332 #ifdef CONFIG_YAFFS_RAM_ENABLED
1333                 // Set the yaffs_Device up for ram emulation
1334
1335                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1336                 if(!dev)
1337                 {
1338                         // Deep shit could not allocate device structure
1339                         T(YAFFS_TRACE_OS,("yaffs_read_super: Failed trying to allocate yaffs_Device.\n"));
1340                         return NULL;
1341                 }
1342
1343                 memset(dev,0,sizeof(yaffs_Device));
1344                 dev->genericDevice = NULL; // Not used for RAM emulation.
1345
1346                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1347                 dev->startBlock = 1;  // Don't use block 0
1348                 dev->endBlock = nBlocks - 1;
1349                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1350                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1351                 dev->nReservedBlocks = 5;
1352
1353                 if(yaffsVersion == 2)
1354                 {
1355                         dev->writeChunkWithTagsToNAND  = nandemul2k_WriteChunkWithTagsToNAND;
1356                         dev->readChunkWithTagsFromNAND = nandemul2k_ReadChunkWithTagsFromNAND;
1357                         dev->markNANDBlockBad          = nandemul2k_MarkNANDBlockBad;
1358                         dev->queryNANDBlock            = nandemul2k_QueryNANDBlock;
1359                         dev->eraseBlockInNAND          = nandemul2k_EraseBlockInNAND;
1360                         dev->initialiseNAND            = nandemul2k_InitialiseNAND;
1361                         dev->isYaffs2 = 1;
1362                         dev->nChunksPerBlock = nandemul2k_GetChunksPerBlock();
1363                         dev->nBytesPerChunk =  nandemul2k_GetBytesPerChunk();;
1364                         nBlocks = nandemul2k_GetNumberOfBlocks();
1365                         dev->startBlock = 1;  // Don't use block 0
1366                         dev->endBlock = nBlocks - 1;
1367                 }
1368                 else
1369                 {
1370                         dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1371                         dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1372                         dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1373                         dev->initialiseNAND = nandemul_InitialiseNAND;
1374                         dev->isYaffs2 = 0;
1375                 }
1376
1377                 yaffsram_dev = dev;
1378
1379 #endif
1380
1381         }
1382         else
1383         {
1384 #ifdef CONFIG_YAFFS_MTD_ENABLED
1385                 struct mtd_info *mtd;
1386
1387                 T(YAFFS_TRACE_ALWAYS,("yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1388                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev)));
1389
1390                 // Check it's an mtd device.....
1391                 if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1392                 {
1393                         return NULL; // This isn't an mtd device
1394                 }
1395
1396                 // Get the device
1397                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1398                 if (!mtd)
1399                 {
1400                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev)));
1401                         return NULL;
1402                 }
1403
1404                 // Check it's NAND
1405                 if(mtd->type != MTD_NANDFLASH)
1406                 {
1407                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1408                         return NULL;
1409                 }
1410
1411                 T(YAFFS_TRACE_OS,(" erase %x\n",mtd->erase));
1412                 T(YAFFS_TRACE_OS,(" read %x\n",mtd->read));
1413                 T(YAFFS_TRACE_OS,(" write %x\n",mtd->write));
1414                 T(YAFFS_TRACE_OS,(" readoob %x\n",mtd->read_oob));
1415                 T(YAFFS_TRACE_OS,(" writeoob %x\n",mtd->write_oob));
1416                 T(YAFFS_TRACE_OS,(" block_isbad %x\n",mtd->block_isbad));
1417                 T(YAFFS_TRACE_OS,(" block_markbad %x\n",mtd->block_markbad));
1418                 T(YAFFS_TRACE_OS,(" oobblock %d\n",mtd->oobblock));
1419                 T(YAFFS_TRACE_OS,(" oobsize %d\n",mtd->oobsize));
1420                 T(YAFFS_TRACE_OS,(" erasesize %d\n",mtd->erasesize));
1421                 T(YAFFS_TRACE_OS,(" size %d\n",mtd->size));
1422
1423                 if(yaffsVersion == 2)
1424                 {
1425                         // Check for version 2 style functions
1426                         if(!mtd->erase ||
1427                            !mtd->block_isbad ||
1428                            !mtd->block_markbad ||
1429                            !mtd->read  ||
1430                            !mtd->write ||
1431 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1432                            !mtd->write_ecc ||
1433                            !mtd->read_ecc ||
1434 #endif
1435                            !mtd->read_oob ||
1436                            !mtd->write_oob )
1437                         {
1438                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1439                                 return NULL;
1440                         }
1441
1442                         if(mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1443                            mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE)
1444                         {
1445                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1446                                 return NULL;
1447                         }               }
1448                 else
1449                 {
1450                         // Check for V1 style functions
1451                         if(!mtd->erase ||
1452                            !mtd->read  ||
1453                            !mtd->write ||
1454 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1455                            !mtd->write_ecc ||
1456                            !mtd->read_ecc ||
1457 #endif
1458                            !mtd->read_oob ||
1459                            !mtd->write_oob )
1460                         {
1461                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1462                                 return NULL;
1463                         }
1464
1465                         if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1466                            mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1467                         {
1468                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1469                                 return NULL;
1470                         }
1471                 }
1472
1473
1474                         // OK, so if we got here, we have an MTD that's NAND and looks
1475                         // like it has the right capabilities
1476                         // Set the yaffs_Device up for mtd
1477
1478 //#if defined(CONFIG_KERNEL_2_5)
1479 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1480                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1481 #else
1482                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1483 #endif
1484                 if(!dev)
1485                 {
1486                         // Deep shit could not allocate device structure
1487                         T(YAFFS_TRACE_ALWAYS,("yaffs_read_super: Failed trying to allocate yaffs_Device. \n"));
1488                         return NULL;
1489                 }
1490
1491                 memset(dev,0,sizeof(yaffs_Device));
1492                 dev->genericDevice = mtd;
1493
1494                 // Set up the memory size parameters....
1495
1496                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1497                 dev->startBlock = 1;  // Don't use block 0
1498                 dev->endBlock = nBlocks - 1;
1499                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1500                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1501                 dev->nReservedBlocks = 5;
1502                 dev->nShortOpCaches = 10; // Enable short op caching
1503
1504
1505                 // ... and the functions.
1506                 if(yaffsVersion == 2)
1507                 {
1508                         dev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND;
1509                         dev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND;
1510                         dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1511                         dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1512                         dev->spareBuffer = YMALLOC(mtd->oobsize);
1513                         dev->isYaffs2 = 1;
1514                         dev->nBytesPerChunk = mtd->oobblock;
1515                         dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1516                         nBlocks = mtd->size / mtd->erasesize;
1517                         dev->startBlock = 1;  // Don't use block 0
1518                         dev->endBlock = nBlocks - 1;
1519                 }
1520                 else
1521                 {
1522                         dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1523                         dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1524                         dev->isYaffs2 = 0;
1525                 }
1526                 // ... and common functions
1527                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1528                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1529
1530                 dev->putSuperFunc = yaffs_MTDPutSuper;
1531
1532 #ifdef CONFIG_YAFFS_USE_NANDECC
1533                 dev->useNANDECC = 1;
1534 #endif
1535
1536                 yaffs_dev = dev;
1537
1538 #endif
1539         }
1540
1541         init_MUTEX(&dev->grossLock);
1542
1543
1544         yaffs_GrossLock(dev);
1545
1546         err = yaffs_GutsInitialise(dev);
1547
1548         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised %s\n", (err == YAFFS_OK) ? "OK" : "FAILED"));
1549
1550         // Create root inode
1551         if(err == YAFFS_OK)
1552           inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(dev));
1553
1554         yaffs_GrossUnlock(dev);
1555
1556         if (!inode)
1557                 return NULL;
1558
1559 // added NCB
1560         inode->i_op = & yaffs_dir_inode_operations;
1561         inode->i_fop = & yaffs_dir_operations;
1562
1563         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1564
1565
1566         root = d_alloc_root(inode);
1567
1568         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1569
1570         if (!root) {
1571                 iput(inode);
1572                 return NULL;
1573         }
1574         sb->s_root = root;
1575
1576         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1577         return sb;
1578 }
1579
1580
1581 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1582 {
1583          return yaffs_internal_read_super(1,1,sb,data,silent) ? 0 : -1;
1584 }
1585 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1586 {
1587          return yaffs_internal_read_super(1,0,sb,data,silent) ? 0 : -1;
1588 }
1589
1590 static int yaffs2_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1591 {
1592          return yaffs_internal_read_super(2,1,sb,data,silent) ? 0 : -1;
1593 }
1594 static int yaffs2_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1595 {
1596          return yaffs_internal_read_super(2,0,sb,data,silent) ? 0 : -1;
1597 }
1598
1599
1600
1601 #ifdef CONFIG_YAFFS_MTD_ENABLED
1602 //#if defined(CONFIG_KERNEL_2_5)
1603 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1604 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1605 {
1606
1607     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1608 }
1609
1610 /* changes NCB 2.5.70 */
1611 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1612 static struct file_system_type yaffs_fs_type = {
1613         .owner          = THIS_MODULE,
1614         .name           = "yaffs",
1615         .get_sb         = yaffs_read_super,
1616 //      .kill_sb        = kill_block_super,
1617         .kill_sb        = kill_litter_super,
1618         .fs_flags       = FS_REQUIRES_DEV,
1619 };
1620 #else
1621 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1622 {
1623         return yaffs_internal_read_super(1,0,sb,data,silent);
1624 }
1625
1626 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1627 #endif
1628
1629 #endif // CONFIG_YAFFS_MTD_ENABLED
1630
1631 #ifdef CONFIG_YAFFS2_MTD_ENABLED
1632
1633 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1634 static struct super_block *yaffs2_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1635 {
1636
1637     return get_sb_bdev(fs, flags, dev_name, data, yaffs2_internal_read_super_mtd);
1638 }
1639
1640 /* changes NCB 2.5.70 */
1641 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1642 static struct file_system_type yaffs2_fs_type = {
1643         .owner          = THIS_MODULE,
1644         .name           = "yaffs2",
1645         .get_sb         = yaffs2_read_super,
1646 //      .kill_sb        = kill_block_super,
1647         .kill_sb        = kill_litter_super,
1648         .fs_flags       = FS_REQUIRES_DEV,
1649 };
1650 #else
1651 static struct super_block *yaffs2_read_super(struct super_block * sb, void * data, int silent)
1652 {
1653         return yaffs_internal_read_super(2,0,sb,data,silent);
1654 }
1655
1656 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, FS_REQUIRES_DEV);
1657 #endif
1658
1659 #endif // CONFIG_YAFFS2_MTD_ENABLED
1660
1661
1662 #ifdef CONFIG_YAFFS_RAM_ENABLED
1663
1664 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1665 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1666 {
1667
1668     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_ram);
1669 }
1670
1671
1672 static struct file_system_type yaffs_ram_fs_type = {
1673         .owner          = THIS_MODULE,
1674         .name           = "yaffsram",
1675         .get_sb         = yaffs_ram_read_super,
1676 //      .kill_sb        = kill_block_super,
1677         .kill_sb        = kill_litter_super,
1678         .fs_flags       = FS_SINGLE,
1679 };
1680 #else
1681 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1682 {
1683         return yaffs_internal_read_super(1,1,sb,data,silent);
1684 }
1685
1686 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1687 #endif
1688
1689 #endif // CONFIG_YAFFS_RAM_ENABLED
1690
1691 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1692
1693 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1694 static struct super_block *yaffs2_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1695 {
1696
1697     return get_sb_bdev(fs, flags, dev_name, data, yaffs2_internal_read_super_ram);
1698 }
1699
1700
1701 static struct file_system_type yaffs2_ram_fs_type = {
1702         .owner          = THIS_MODULE,
1703         .name           = "yaffs2ram",
1704         .get_sb         = yaffs2_ram_read_super,
1705 //      .kill_sb        = kill_block_super,
1706         .kill_sb        = kill_litter_super,
1707         .fs_flags       = FS_SINGLE,
1708 };
1709 #else
1710 static struct super_block *yaffs2_ram_read_super(struct super_block * sb, void * data, int silent)
1711 {
1712         return yaffs_internal_read_super(2,1,sb,data,silent);
1713 }
1714
1715 static DECLARE_FSTYPE(yaffs2_ram_fs_type, "yaffs2ram", yaffs2_ram_read_super, FS_SINGLE);
1716 #endif
1717
1718 #endif // CONFIG_YAFFS2_RAM_ENABLED
1719
1720
1721
1722 static struct proc_dir_entry *my_proc_entry;
1723 static struct proc_dir_entry *my_proc_ram_write_entry;
1724
1725 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
1726 {
1727         buf +=sprintf(buf,"\nDevice %s\n",name);
1728         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1729         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1730         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1731         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1732         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1733         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1734         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1735         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1736         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1737         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1738         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1739         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1740         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1741         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1742         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1743         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1744         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1745         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1746         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1747         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1748         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1749         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1750         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1751         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1752         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1753         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1754         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1755         buf +=sprintf(buf,"isYaffs2........... %d\n",dev->isYaffs2);
1756
1757
1758         return buf;
1759 }
1760
1761 static int  yaffs_proc_read(
1762         char *page,
1763         char **start,
1764         off_t offset,
1765         int count,
1766         int *eof,
1767         void *data
1768         )
1769 {
1770
1771         char my_buffer[3000];
1772         char *buf;
1773         buf = my_buffer;
1774
1775         if (offset > 0) return 0;
1776
1777         /* Fill the buffer and get its length */
1778         buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
1779
1780         if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
1781         if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
1782
1783
1784         strcpy(page,my_buffer);
1785         return strlen(my_buffer);
1786 }
1787
1788
1789 static int  yaffs_proc_ram_write(
1790         char *page,
1791         char **start,
1792         off_t offset,
1793         int count,
1794         int *eof,
1795         void *data
1796         )
1797 {
1798
1799         printk(KERN_DEBUG "yaffs write size %d\n",count);
1800         return count;
1801 }
1802
1803
1804
1805 // Stuff to handle installation of file systems
1806 struct file_system_to_install
1807 {
1808    struct file_system_type *fst;
1809    int installed;
1810 };
1811
1812 static struct file_system_to_install fs_to_install[] =
1813 {
1814 #ifdef CONFIG_YAFFS_RAM_ENABLED
1815      { &yaffs_ram_fs_type, 0},
1816 #endif
1817 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1818      { &yaffs2_ram_fs_type,0},
1819 #endif
1820 #ifdef CONFIG_YAFFS_MTD_ENABLED
1821      { &yaffs_fs_type,0},
1822 #endif
1823 #ifdef CONFIG_YAFFS2_MTD_ENABLED
1824      { &yaffs2_fs_type,0},
1825 #endif
1826      { NULL,0}
1827 };
1828
1829 static int __init init_yaffs_fs(void)
1830 {
1831         int error = 0;
1832         struct file_system_to_install *fsinst;
1833
1834         yaffs_dev = yaffsram_dev = NULL;
1835
1836    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
1837
1838
1839
1840     /* Install the proc_fs entry */
1841     my_proc_entry = create_proc_read_entry("yaffs",
1842                                            S_IRUGO | S_IFREG,
1843                                            &proc_root,
1844                                            yaffs_proc_read,
1845                                            NULL);
1846     if(!my_proc_entry)
1847     {
1848        return -ENOMEM;
1849     }
1850
1851
1852
1853     // Now add the file system entries
1854
1855     fsinst = fs_to_install;
1856
1857     while(fsinst->fst && !error)
1858     {
1859       error = register_filesystem(fsinst->fst);
1860       if(!error)
1861       {
1862           fsinst->installed = 1;
1863       }
1864       fsinst++;
1865     }
1866
1867     // Any errors? uninstall
1868     if(error)
1869     {
1870             fsinst = fs_to_install;
1871
1872             while(fsinst->fst)
1873             {
1874               if(fsinst->installed)
1875               {
1876                 unregister_filesystem(fsinst->fst);
1877                 fsinst->installed = 0;
1878               }
1879               fsinst++;
1880             }
1881     }
1882
1883     return error;
1884 }
1885
1886 static void __exit exit_yaffs_fs(void)
1887 {
1888
1889    struct file_system_to_install *fsinst;
1890
1891    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " removing. \n"));
1892
1893    remove_proc_entry("yaffs",&proc_root);
1894
1895     fsinst = fs_to_install;
1896
1897     while(fsinst->fst)
1898     {
1899       if(fsinst->installed)
1900       {
1901         unregister_filesystem(fsinst->fst);
1902         fsinst->installed = 0;
1903       }
1904       fsinst++;
1905     }
1906
1907 }
1908
1909 module_init(init_yaffs_fs)
1910 module_exit(exit_yaffs_fs)
1911
1912 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
1913 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002,2003,2004");
1914 MODULE_LICENSE("GPL");
1915