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  * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with this superblock
  19  * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this superblock
  20  * >> inode->u.generic_ip points to the associated yaffs_Object.
  21  *
  22  *
  23  * Acknowledgements:
  24  * * Luc van OostenRyck for numerous patches.
  25  * * Nick Bane for numerous patches.
  26  * * Nick Bane for 2.5/2.6 integration.
  27  * * Andras Toth for mknod rdev issue.
  28  * * Michael Fischer for finding the problem with inode inconsistency.
  29  * * Some code bodily lifted from JFFS2.
  30  */
  31
  32
  33 const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.21 2005-08-01 20:49:38 luc Exp $";
  34 extern const char *yaffs_guts_c_version;
  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/smp_lock.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/mtd/mtd.h>
  49 #include <linux/interrupt.h>
  50 #include <linux/string.h>
  51
  52
  53 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  54
  55 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  56 #include <asm/statfs.h>
  57 #define UnlockPage(p) unlock_page(p)
  58 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  59 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)       // FIXME: use sb->s_id instead ?
  60
  61 #else
  62
  63 #include <linux/locks.h>
  64 #define BDEVNAME_SIZE           0
  65 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
  66
  67 #endif
  68
  69 #include <asm/uaccess.h>
  70
  71 #include "yportenv.h"
  72 #include "yaffs_guts.h"
  73
  74
  75
  76
  77 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
  78 //unsigned yaffs_traceMask = 0xFFFFFFFF;
  79
  80
  81 #ifdef CONFIG_YAFFS_RAM_ENABLED
  82 #include "yaffs_nandemul.h"
  83 // 2 MB of RAM for emulation
  84 #define YAFFS_RAM_EMULATION_SIZE  0x200000
  85 #endif //CONFIG_YAFFS_RAM_ENABLED
  86
  87 #if CONFIG_YAFFS2_RAM_ENABLED
  88 #include "yaffs_nandemul2k.h"
  89 #endif
  90
  91 #ifdef CONFIG_YAFFS_YAFFS1
  92 #include <linux/mtd/mtd.h>
  93 #include "yaffs_mtdif.h"
  94 #include "yaffs_mtdif2.h"
  95 #endif //CONFIG_YAFFS_YAFFS1
  96
  97 //#define T(x) printk x
  98
  99
 100
 101 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
 102 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
 103 //NCB #define yaffs_SuperToDevice(sb)   ((yaffs_Device *)sb->u.generic_sbp)
 104
 105 //#if defined(CONFIG_KERNEL_2_5)
 106 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 107 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
 108 #else
 109 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 110 #endif
 111
 112
 113 static void yaffs_put_super(struct super_block *sb);
 114
 115 #if 0
 116 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos);
 117 #endif
 118
 119 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
 120
 121 static int yaffs_file_flush(struct file* file);
 122
 123 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
 124
 125 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 126
 127 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 128 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 129 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n);
 130 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n);
 131 #else
 132 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 133 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
 134 #endif
 135 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
 136 static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
 137 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
 138 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
 139
 140 //#if defined(CONFIG_KERNEL_2_5)
 141 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 142 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
 143 #else
 144 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
 145 #endif
 146 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
 147 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 148
 149 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 150 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 151 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 152 #else
 153 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 154 #endif
 155 static void yaffs_read_inode (struct inode *inode);
 156
 157 static void yaffs_put_inode (struct inode *inode);
 158 static void yaffs_delete_inode(struct inode *);
 159 static void yaffs_clear_inode(struct inode *);
 160
 161 static int yaffs_readpage(struct file *file, struct page * page);
 162 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 163 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 164 #else
 165 static int yaffs_writepage(struct page *page);
 166 #endif
 167 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 168 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 169
 170 static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen);
 171 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 172
 173
 174
 175 static struct address_space_operations yaffs_file_address_operations = {
 176         .readpage       = yaffs_readpage,
 177         .writepage      = yaffs_writepage,
 178         .prepare_write  = yaffs_prepare_write,
 179         .commit_write   = yaffs_commit_write,
 180 };
 181
 182 static struct file_operations yaffs_file_operations = {
 183         .read           = generic_file_read,
 184         .write          = generic_file_write,
 185         .mmap           = generic_file_mmap,
 186         .flush          = yaffs_file_flush,
 187         .fsync          = yaffs_sync_object,
 188 };
 189
 190 static struct inode_operations yaffs_file_inode_operations = {
 191         .setattr        = yaffs_setattr,
 192 };
 193
 194 static struct inode_operations yaffs_symlink_inode_operations = {
 195         .readlink       = yaffs_readlink,
 196         .follow_link    = yaffs_follow_link,
 197         .setattr        = yaffs_setattr,
 198 };
 199
 200 static struct inode_operations yaffs_dir_inode_operations = {
 201         .create         = yaffs_create,
 202         .lookup         = yaffs_lookup,
 203         .link           = yaffs_link,
 204         .unlink         = yaffs_unlink,
 205         .symlink        = yaffs_symlink,
 206         .mkdir          = yaffs_mkdir,
 207         .rmdir          = yaffs_unlink,
 208         .mknod          = yaffs_mknod,
 209         .rename         = yaffs_rename,
 210         .setattr        = yaffs_setattr,
 211 };
 212
 213 static struct file_operations yaffs_dir_operations = {
 214         .read           = generic_read_dir,
 215         .readdir        = yaffs_readdir,
 216         .fsync          = yaffs_sync_object,
 217 };
 218
 219 static struct super_operations yaffs_super_ops = {
 220         .statfs         = yaffs_statfs,
 221         .read_inode     = yaffs_read_inode,
 222         .put_inode      = yaffs_put_inode,
 223         .put_super      = yaffs_put_super,
 224         .delete_inode   = yaffs_delete_inode,
 225         .clear_inode    = yaffs_clear_inode,
 226 };
 227
 228
 229
 230 static void yaffs_GrossLock(yaffs_Device *dev)
 231 {
 232         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
 233
 234         down(&dev->grossLock);
 235 }
 236
 237 static void yaffs_GrossUnlock(yaffs_Device *dev)
 238 {
 239         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
 240         up(&dev->grossLock);
 241
 242 }
 243
 244 static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
 245 {
 246         unsigned char *alias;
 247         int ret;
 248
 249         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 250
 251
 252         yaffs_GrossLock(dev);
 253
 254         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 255
 256         yaffs_GrossUnlock(dev);
 257
 258         if(!alias)
 259                 return -ENOMEM;
 260
 261         ret = vfs_readlink(dentry, buffer, buflen, alias);
 262         kfree(alias);
 263         return ret;
 264 }
 265
 266 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 267 {
 268         unsigned char *alias;
 269         int ret;
 270         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 271
 272
 273         yaffs_GrossLock(dev);
 274
 275         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 276
 277         yaffs_GrossUnlock(dev);
 278
 279         if(!alias)
 280                 return -ENOMEM;
 281
 282         ret = vfs_follow_link(nd,alias);
 283         kfree(alias);
 284         return ret;
 285 }
 286
 287
 288 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 289
 290 /*
 291  * Lookup is used to find objects in the fs
 292  */
 293 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 294 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 295
 296 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 297 #else
 298 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 299 #endif
 300 {
 301         yaffs_Object *obj;
 302         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 303
 304         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 305
 306
 307         yaffs_GrossLock(dev);
 308
 309
 310         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 311
 312         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 313
 314         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 315
 316
 317
 318         if(obj)
 319         {
 320                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 321
 322                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode,0,obj);
 323
 324                 if(inode)
 325                 {
 326                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
 327 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 328 #if 0
 329                         //dget(dentry); // try to solve directory bug
 330                         d_add(dentry,inode);
 331
 332                         yaffs_GrossUnlock(dev);
 333
 334                         // return dentry;
 335                         return NULL;
 336 #endif
 337                 }
 338
 339         }
 340         else
 341         {
 342                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
 343
 344         }
 345         yaffs_GrossUnlock(dev);
 346
 347 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 348         d_add(dentry,inode);
 349
 350         return NULL;
 351         //      return (ERR_PTR(-EIO));
 352
 353 }
 354
 355 // For now put inode is just for debugging
 356 // Put inode is called when the inode **structure** is put.
 357 static void yaffs_put_inode(struct inode *inode)
 358 {
 359         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 360
 361 }
 362
 363 // clear is called to tell the fs to release any per-inode data it holds
 364 static void yaffs_clear_inode(struct inode *inode)
 365 {
 366         yaffs_Object *obj;
 367         yaffs_Device *dev;
 368
 369         obj = yaffs_InodeToObject(inode);
 370
 371         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 372                 obj ? "object exists" : "null object"));
 373
 374         if(obj)
 375         {
 376                 dev = obj->myDev;
 377                 yaffs_GrossLock(dev);
 378
 379                 // Clear the association between the inode ant the yaffs_Object.
 380                 obj->myInode = NULL;
 381                 inode->u.generic_ip = NULL;
 382
 383                 // If the object freeing was deferred, then the real free happens now.
 384                 // This should fix the inode inconsistency problem.
 385
 386                 yaffs_HandleDeferedFree(obj);
 387
 388                 yaffs_GrossUnlock(dev);
 389         }
 390
 391
 392 }
 393
 394 // delete is called when the link count is zero and the inode
 395 // is put (ie. nobody wants to know about it anymore, time to
 396 // delete the file).
 397 // NB Must call clear_inode()
 398 static void yaffs_delete_inode(struct inode *inode)
 399 {
 400         yaffs_Object *obj = yaffs_InodeToObject(inode);
 401         yaffs_Device *dev;
 402
 403         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 404                 obj ? "object exists" : "null object"));
 405
 406         if(obj)
 407         {
 408                 dev = obj->myDev;
 409                 yaffs_GrossLock(dev);
 410                 yaffs_DeleteFile(obj);
 411                 yaffs_GrossUnlock(dev);
 412         }
 413         clear_inode(inode);
 414 }
 415
 416
 417 static int yaffs_file_flush(struct file* file)
 418 {
 419         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 420
 421         yaffs_Device *dev = obj->myDev;
 422
 423         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 424                                 obj->dirty ? "dirty" : "clean"));
 425
 426         yaffs_GrossLock(dev);
 427
 428     yaffs_FlushFile(obj,1);
 429
 430         yaffs_GrossUnlock(dev);
 431
 432     return 0;
 433 }
 434
 435
 436
 437 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 438 {
 439         // Lifted from jffs2
 440
 441         yaffs_Object *obj;
 442         unsigned char *pg_buf;
 443         int ret;
 444
 445         yaffs_Device *dev;
 446
 447         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 448                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 449
 450         obj  = yaffs_DentryToObject(f->f_dentry);
 451
 452         dev = obj->myDev;
 453
 454
 455 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 456         BUG_ON(!PageLocked(pg));
 457 #else
 458         if (!PageLocked(pg))
 459                 PAGE_BUG(pg);
 460 #endif
 461
 462         pg_buf = kmap(pg);
 463         /* FIXME: Can kmap fail? */
 464
 465         yaffs_GrossLock(dev);
 466
 467         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 468
 469         yaffs_GrossUnlock(dev);
 470
 471         if(ret >= 0) ret = 0;
 472
 473         if (ret) {
 474                 ClearPageUptodate(pg);
 475                 SetPageError(pg);
 476         } else {
 477                 SetPageUptodate(pg);
 478                 ClearPageError(pg);
 479         }
 480
 481         flush_dcache_page(pg);
 482         kunmap(pg);
 483
 484
 485         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
 486         return ret;
 487 }
 488
 489 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 490 {
 491         int ret = yaffs_readpage_nolock(f,pg);
 492         UnlockPage(pg);
 493         return ret;
 494 }
 495
 496 static int yaffs_readpage(struct file *f, struct page * pg)
 497 {
 498         return yaffs_readpage_unlock(f,pg);
 499 }
 500
 501 // writepage inspired by/stolen from smbfs
 502 //
 503
 504 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 505 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 506 #else
 507 static int yaffs_writepage(struct page *page)
 508 #endif
 509 {
 510         struct address_space *mapping = page->mapping;
 511         struct inode *inode;
 512         unsigned long end_index;
 513         char *buffer;
 514         yaffs_Object *obj;
 515         int nWritten = 0;
 516         unsigned nBytes;
 517
 518         if (!mapping)
 519                 BUG();
 520         inode = mapping->host;
 521         if (!inode)
 522                 BUG();
 523
 524         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 525
 526         /* easy case */
 527         if (page->index < end_index)
 528         {
 529                 nBytes = PAGE_CACHE_SIZE;
 530         }
 531         else
 532         {
 533                 nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
 534         }
 535         //  What's happening here?
 536         ///* OK, are we completely out? */
 537         //if (page->index >= end_index+1 || !offset)
 538         //      return -EIO;
 539
 540         get_page(page);
 541
 542
 543         buffer = kmap(page);
 544
 545         obj = yaffs_InodeToObject(inode);
 546         yaffs_GrossLock(obj->myDev);
 547
 548
 549         nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes,0);
 550
 551         yaffs_GrossUnlock(obj->myDev);
 552
 553         kunmap(page);
 554         SetPageUptodate(page);
 555         UnlockPage(page);
 556         put_page(page);
 557
 558         return (nWritten == nBytes) ? 0  : -ENOSPC;
 559 }
 560
 561
 562
 563 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 564 {
 565
 566         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
 567         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 568                 return  yaffs_readpage_nolock(f,pg);
 569
 570         return 0;
 571
 572 }
 573
 574 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 575 {
 576
 577         void *addr = page_address(pg) + offset;
 578         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 579         int nBytes = to - offset;
 580         int nWritten;
 581
 582         unsigned spos = pos;
 583         unsigned saddr = (unsigned)addr;
 584
 585         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 586
 587         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 588
 589         if(nWritten != nBytes)
 590         {
 591                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 592                 SetPageError(pg);
 593                 ClearPageUptodate(pg);
 594         }
 595         else
 596         {
 597                 SetPageUptodate(pg);
 598         }
 599
 600         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 601
 602         return nWritten;
 603
 604 }
 605
 606
 607
 608 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 609 {
 610         if (inode && obj)
 611         {
 612                 inode->i_ino = obj->objectId;
 613                 inode->i_mode = obj->yst_mode;
 614                 inode->i_uid = obj->yst_uid;
 615                 inode->i_gid = obj->yst_gid;
 616                 inode->i_blksize = inode->i_sb->s_blocksize;
 617 //#if defined(CONFIG_KERNEL_2_5)
 618 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 619
 620                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 621                 inode->i_atime.tv_sec = (time_t)(obj->yst_atime);
 622                 inode->i_atime.tv_nsec = 0;
 623                 inode->i_mtime.tv_sec = (time_t)obj->yst_mtime;
 624                 inode->i_mtime.tv_nsec =0;
 625                 inode->i_ctime.tv_sec = (time_t)obj->yst_ctime;
 626                 inode->i_ctime.tv_nsec = 0;
 627 #else
 628                 inode->i_rdev = obj->yst_rdev;
 629                 inode->i_atime = obj->yst_atime;
 630                 inode->i_mtime = obj->yst_mtime;
 631                 inode->i_ctime = obj->yst_ctime;
 632 #endif
 633                 inode->i_size = yaffs_GetObjectFileLength(obj);
 634                 inode->i_blocks = (inode->i_size + 511) >> 9;
 635
 636                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 637
 638                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 639                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 640
 641                 switch (obj->yst_mode & S_IFMT)
 642                 {
 643                         default: // fifo, device or socket
 644 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 645                                init_special_inode(inode, obj->yst_mode,old_decode_dev(obj->yst_rdev));
 646 #else
 647                                  init_special_inode(inode, obj->yst_mode,(dev_t)(obj->yst_rdev));
 648 #endif
 649                         break;
 650                         case S_IFREG:   // file
 651                                 inode->i_op = &yaffs_file_inode_operations;
 652                                 inode->i_fop = &yaffs_file_operations;
 653                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 654                                 break;
 655                         case S_IFDIR:   // directory
 656                                 inode->i_op = &yaffs_dir_inode_operations;
 657                                 inode->i_fop = &yaffs_dir_operations;
 658                                 break;
 659                         case S_IFLNK:   // symlink
 660                                 inode->i_op = &yaffs_symlink_inode_operations;
 661                                 break;
 662                 }
 663
 664
 665                 inode->u.generic_ip = obj;
 666                 obj->myInode = inode;
 667
 668         }
 669         else
 670         {
 671                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 672         }
 673
 674 }
 675
 676 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 677 {
 678         struct inode * inode;
 679
 680         if(!sb)
 681         {
 682           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL super_block!!\n"));
 683           return NULL;
 684
 685         }
 686
 687         if(!obj)
 688         {
 689           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL object!!\n"));
 690           return NULL;
 691
 692         }
 693
 694         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 695
 696         inode = iget(sb,obj->objectId);
 697
 698         // NB Side effect: iget calls back to yaffs_read_inode().
 699         // iget also increments the inode's i_count
 700
 701         return inode;
 702 }
 703
 704 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 705 {
 706         yaffs_Object *obj;
 707         int nWritten,ipos;
 708         struct inode *inode;
 709         yaffs_Device *dev;
 710
 711
 712         obj  = yaffs_DentryToObject(f->f_dentry);
 713
 714         dev = obj->myDev;
 715
 716         yaffs_GrossLock(dev);
 717
 718         inode = f->f_dentry->d_inode;
 719
 720         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 721         {
 722                 ipos = inode->i_size;
 723         }
 724         else
 725         {
 726                 ipos = *pos;
 727         }
 728
 729
 730         if(!obj)
 731         {
 732                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 733         }
 734         else
 735         {
 736                 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));
 737         }
 738
 739         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n,0);
 740
 741         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 742         if(nWritten > 0)
 743         {
 744                 ipos += nWritten;
 745                 *pos = ipos;
 746                 if(ipos > inode->i_size)
 747                 {
 748                         inode->i_size = ipos;
 749                         inode->i_blocks = (ipos + 511)>>9;
 750
 751                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 752                 }
 753
 754         }
 755         yaffs_GrossUnlock(dev);
 756
 757         return nWritten != n ? -ENOSPC : nWritten;
 758 }
 759
 760
 761
 762 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 763 {
 764         yaffs_Object *obj;
 765         yaffs_Device *dev;
 766         struct inode *inode = f->f_dentry->d_inode;
 767         unsigned long offset, curoffs;
 768         struct list_head *i;
 769         yaffs_Object *l;
 770
 771         char name[YAFFS_MAX_NAME_LENGTH +1];
 772
 773         obj =  yaffs_DentryToObject(f->f_dentry);
 774         dev = obj->myDev;
 775
 776         yaffs_GrossLock(dev);
 777
 778         offset = f->f_pos;
 779
 780         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 781
 782         if(offset == 0)
 783         {
 784         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 785                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 786                 {
 787                         goto out;
 788                 }
 789                 offset++;
 790                 f->f_pos++;
 791         }
 792         if(offset == 1)
 793         {
 794                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 795                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 796                 {
 797                         goto out;
 798                 }
 799                 offset++;
 800                 f->f_pos++;
 801         }
 802
 803         curoffs = 1;
 804
 805         list_for_each(i,&obj->variant.directoryVariant.children)
 806         {
 807                 curoffs++;
 808                 if(curoffs >= offset)
 809                 {
 810                         l = list_entry(i, yaffs_Object,siblings);
 811
 812                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 813                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 814
 815                         if(filldir(dirent,
 816                                            name,
 817                                            strlen(name),
 818                                            offset,
 819                                            yaffs_GetObjectInode(l),
 820                                            yaffs_GetObjectType(l))
 821                                            < 0)
 822                         {
 823                                 goto up_and_out;
 824                         }
 825
 826                         offset++;
 827                         f->f_pos++;
 828                 }
 829         }
 830
 831   up_and_out:
 832   out:
 833
 834     yaffs_GrossUnlock(dev);
 835
 836         return 0;
 837 }
 838
 839
 840 /*
 841  * File creation. Allocate an inode, and we're done..
 842  */
 843 //#if defined(CONFIG_KERNEL_2_5)
 844 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 845 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 846 #else
 847 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 848 #endif
 849 {
 850         struct inode *inode;
 851
 852         yaffs_Object *obj = NULL;
 853         yaffs_Device *dev;
 854
 855         yaffs_Object *parent = yaffs_InodeToObject(dir);
 856
 857         int error = -ENOSPC;
 858         uid_t uid = current->fsuid;
 859         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
 860
 861         if(parent)
 862         {
 863                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 864                                          parent->objectId,parent->variantType));
 865         }
 866         else
 867         {
 868                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 869                 return -EPERM;
 870         }
 871
 872         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 873                                         dentry->d_name.name, mode,rdev));
 874
 875         dev = parent->myDev;
 876
 877         yaffs_GrossLock(dev);
 878
 879         switch (mode & S_IFMT)
 880         {
 881                 default:
 882                         // Special (socket, fifo, device...)
 883                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 884 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 885                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,uid, gid,old_encode_dev(rdev));
 886 #else
 887                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,uid, gid,rdev);
 888 #endif
 889                 break;
 890                 case S_IFREG:   // file
 891                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 892                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,uid, gid);
 893                         break;
 894                 case S_IFDIR:   // directory
 895                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 896                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,uid, gid);
 897                         break;
 898                 case S_IFLNK:   // symlink
 899                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 900                         obj = NULL; // Do we ever get here?
 901                         break;
 902         }
 903
 904         if(obj)
 905         {
 906                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 907                 d_instantiate(dentry, inode);
 908                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 909                 error = 0;
 910         }
 911         else
 912         {
 913                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 914                 error = -ENOMEM;
 915         }
 916
 917         yaffs_GrossUnlock(dev);
 918
 919         return error;
 920 }
 921
 922 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 923 {
 924         int retVal;
 925         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 926         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 927 #if 0
 928  // attempt to fix dir bug - didn't work
 929         if(!retVal)
 930         {
 931                 dget(dentry);
 932         }
 933 #endif
 934         return retVal;
 935 }
 936
 937 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 938 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 939 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
 940 #else
 941 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 942 #endif
 943 {
 944         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
 945         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 946 }
 947
 948
 949 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 950 {
 951         int retVal;
 952
 953         yaffs_Device *dev;
 954
 955
 956         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
 957
 958         dev = yaffs_InodeToObject(dir)->myDev;
 959
 960         yaffs_GrossLock(dev);
 961
 962
 963         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
 964
 965
 966         yaffs_GrossUnlock(dev);
 967
 968         if( retVal == YAFFS_OK)
 969         {
 970                 dentry->d_inode->i_nlink--;
 971                 mark_inode_dirty(dentry->d_inode);
 972                 return 0;
 973         }
 974         else
 975         {
 976                 return -ENOTEMPTY;
 977         }
 978 }
 979
 980
 981 /*
 982  * Create a link...
 983  */
 984 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
 985 {
 986         struct inode *inode = old_dentry->d_inode;
 987         yaffs_Object *obj = NULL;
 988         yaffs_Object *link=NULL;
 989         yaffs_Device *dev;
 990
 991         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
 992
 993         obj = yaffs_InodeToObject(inode);
 994         dev = obj->myDev;
 995
 996         yaffs_GrossLock(dev);
 997
 998         if (!S_ISDIR(inode->i_mode))    // Don't link directories
 999         {
1000                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
1001         }
1002
1003
1004         if(link)
1005         {
1006                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
1007                 d_instantiate(dentry, old_dentry->d_inode);
1008                 atomic_inc(&old_dentry->d_inode->i_count);
1009                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
1010                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
1011
1012         }
1013
1014         yaffs_GrossUnlock(dev);
1015
1016
1017         if(link)
1018         {
1019
1020                 return 0;
1021         }
1022
1023
1024         return -EPERM;
1025 }
1026
1027
1028 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
1029 {
1030         yaffs_Object *obj;
1031         yaffs_Device *dev;
1032         uid_t uid = current->fsuid;
1033         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1034
1035         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
1036
1037         dev = yaffs_InodeToObject(dir)->myDev;
1038         yaffs_GrossLock(dev);
1039         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1040                                                          S_IFLNK | S_IRWXUGO, uid, gid,
1041                                                          symname);
1042         yaffs_GrossUnlock(dev);
1043
1044         if(obj)
1045         {
1046
1047                 struct inode* inode;
1048
1049                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1050                 d_instantiate(dentry, inode);
1051                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
1052                 return 0;
1053         }
1054         else
1055         {
1056                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
1057
1058         }
1059
1060         return -ENOMEM;
1061 }
1062
1063 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
1064 {
1065
1066         yaffs_Object *obj;
1067         yaffs_Device *dev;
1068
1069         obj = yaffs_DentryToObject(dentry);
1070
1071         dev = obj->myDev;
1072
1073         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
1074         yaffs_GrossLock(dev);
1075         yaffs_FlushFile(obj,1);
1076         yaffs_GrossUnlock(dev);
1077         return 0;
1078 }
1079
1080 /*
1081  * The VFS layer already does all the dentry stuff for rename.
1082  *
1083  * NB: POSIX says you can rename an object over an old object of the same name
1084  */
1085 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1086 {
1087         yaffs_Device *dev;
1088         int retVal = YAFFS_FAIL;
1089         int removed = 0;
1090         yaffs_Object *target;
1091
1092         dev = yaffs_InodeToObject(old_dir)->myDev;
1093
1094         yaffs_GrossLock(dev);
1095
1096         // Check if the target is an existing directory that is not empty.
1097         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1098
1099         if(target &&
1100            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1101            !list_empty(&target->variant.directoryVariant.children))
1102         {
1103                 retVal = YAFFS_FAIL;
1104         }
1105         else
1106         {
1107
1108                 // Unlink the target if it exists
1109                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1110
1111
1112                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1113                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1114
1115         }
1116         yaffs_GrossUnlock(dev);
1117
1118         if(retVal == YAFFS_OK)
1119         {
1120                 if(removed == YAFFS_OK)
1121                 {
1122                         new_dentry->d_inode->i_nlink--;
1123                         mark_inode_dirty(new_dentry->d_inode);
1124                 }
1125
1126                 return 0;
1127         }
1128         else
1129         {
1130                 return -ENOTEMPTY;
1131         }
1132
1133
1134 }
1135
1136 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1137 {
1138         struct inode *inode = dentry->d_inode;
1139         int error;
1140         yaffs_Device *dev;
1141
1142         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1143
1144         if((error = inode_change_ok(inode,attr)) == 0)
1145         {
1146
1147                 dev = yaffs_InodeToObject(inode)->myDev;
1148                 yaffs_GrossLock(dev);
1149                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1150                 {
1151                         error = 0;
1152                 }
1153                 else
1154                 {
1155                         error = -EPERM;
1156                 }
1157                 yaffs_GrossUnlock(dev);
1158                 if (!error)
1159                         error = inode_setattr(inode,attr);
1160         }
1161         return error;
1162 }
1163
1164 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
1165 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1166 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1167 #else
1168 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1169 #endif
1170 {
1171
1172
1173         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1174         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1175
1176         yaffs_GrossLock(dev);
1177
1178
1179         buf->f_type = YAFFS_MAGIC;
1180         buf->f_bsize = sb->s_blocksize;
1181         buf->f_namelen = 255;
1182         if(sb->s_blocksize > dev->nBytesPerChunk)
1183         {
1184
1185                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock/
1186                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1187                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1188                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1189         }
1190         else
1191         {
1192
1193                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock *
1194                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1195                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev) *
1196                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1197         }
1198         buf->f_files = 0;
1199         buf->f_ffree = 0;
1200         buf->f_bavail =  buf->f_bfree;
1201
1202         yaffs_GrossUnlock(dev);
1203         return 0;
1204 }
1205
1206 static void yaffs_read_inode (struct inode *inode)
1207 {
1208         // NB This is called as a side effect of other functions and
1209         // thus gross locking should always be in place already.
1210
1211         yaffs_Object *obj ;
1212         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1213
1214         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1215
1216         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1217
1218         yaffs_FillInodeFromObject(inode,obj);
1219
1220 }
1221
1222 static LIST_HEAD(yaffs_dev_list);
1223
1224 static void yaffs_put_super(struct super_block *sb)
1225 {
1226         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1227
1228         yaffs_GrossLock(dev);
1229         if(dev->putSuperFunc)
1230         {
1231                  dev->putSuperFunc(sb);
1232         }
1233         yaffs_Deinitialise(dev);
1234         yaffs_GrossUnlock(dev);
1235
1236         /* we assume this is protected by lock_kernel() in mount/umount */
1237         list_del(&dev->devList);
1238
1239         kfree(dev);
1240 }
1241
1242
1243 #ifdef CONFIG_YAFFS_YAFFS1
1244
1245 static void  yaffs_MTDPutSuper(struct super_block *sb)
1246 {
1247
1248         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1249
1250         if(mtd->sync)
1251         {
1252                 mtd->sync(mtd);
1253         }
1254
1255         put_mtd_device(mtd);
1256 }
1257
1258 #endif
1259
1260
1261 static struct super_block *yaffs_internal_read_super(int yaffsVersion,int useRam, struct super_block * sb, void * data, int silent)
1262 {
1263         int nBlocks;
1264         struct inode * inode = NULL;
1265         struct dentry * root;
1266         yaffs_Device *dev = 0;
1267         char devname_buf[BDEVNAME_SIZE+1];
1268         int err;
1269
1270         sb->s_magic = YAFFS_MAGIC;
1271         sb->s_op = &yaffs_super_ops;
1272
1273         if(!sb)
1274                 printk(KERN_INFO"yaffs: sb is NULL\n");
1275         else if(!sb->s_dev)
1276                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1277         else if(!yaffs_devname(sb, devname_buf))
1278                 printk(KERN_INFO"yaffs: devname is NULL\n");
1279         else
1280                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, yaffs_devname(sb, devname_buf));
1281
1282
1283
1284         sb->s_blocksize = PAGE_CACHE_SIZE;
1285         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1286         T(YAFFS_TRACE_OS,("yaffs_read_super: Using yaffs%d\n",yaffsVersion));
1287         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1288
1289 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1290         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1291 #endif
1292
1293
1294
1295         if(useRam)
1296         {
1297
1298 #ifdef CONFIG_YAFFS_RAM_ENABLED
1299                 // Set the yaffs_Device up for ram emulation
1300
1301
1302 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1303                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1304 #else
1305                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1306 #endif
1307
1308                 if(!dev)
1309                 {
1310                         // Deep shit could not allocate device structure
1311                         T(YAFFS_TRACE_OS,("yaffs_read_super: Failed trying to allocate yaffs_Device.\n"));
1312                         return NULL;
1313                 }
1314
1315                 memset(dev,0,sizeof(yaffs_Device));
1316                 dev->genericDevice = NULL; // Not used for RAM emulation.
1317                 dev->name = sb->s_type->name;
1318
1319                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1320                 dev->startBlock = 0;
1321                 dev->endBlock = nBlocks - 1;
1322                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1323                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1324                 dev->nReservedBlocks = 5;
1325
1326                 if(yaffsVersion == 2)
1327                 {
1328                         dev->writeChunkWithTagsToNAND  = nandemul2k_WriteChunkWithTagsToNAND;
1329                         dev->readChunkWithTagsFromNAND = nandemul2k_ReadChunkWithTagsFromNAND;
1330                         dev->markNANDBlockBad          = nandemul2k_MarkNANDBlockBad;
1331                         dev->queryNANDBlock            = nandemul2k_QueryNANDBlock;
1332                         dev->eraseBlockInNAND          = nandemul2k_EraseBlockInNAND;
1333                         dev->initialiseNAND            = nandemul2k_InitialiseNAND;
1334                         dev->isYaffs2 = 1;
1335                         dev->nChunksPerBlock = nandemul2k_GetChunksPerBlock();
1336                         dev->nBytesPerChunk =  nandemul2k_GetBytesPerChunk();;
1337                         nBlocks = nandemul2k_GetNumberOfBlocks();
1338                         dev->startBlock = 0;
1339                         dev->endBlock = nBlocks - 1;
1340                 }
1341                 else
1342                 {
1343                         dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1344                         dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1345                         dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1346                         dev->initialiseNAND = nandemul_InitialiseNAND;
1347                         dev->isYaffs2 = 0;
1348                 }
1349 #endif
1350
1351         }
1352         else
1353         {
1354 #if defined(CONFIG_YAFFS_YAFFS1) || defined(CONFIG_YAFFS_YAFFS2)
1355                 struct mtd_info *mtd;
1356
1357                 T(YAFFS_TRACE_ALWAYS,("yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1358                  MAJOR(sb->s_dev),MINOR(sb->s_dev), yaffs_devname(sb, devname_buf)));
1359
1360                 // Check it's an mtd device.....
1361                 if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1362                 {
1363                         return NULL; // This isn't an mtd device
1364                 }
1365
1366                 // Get the device
1367                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1368                 if (!mtd)
1369                 {
1370                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev)));
1371                         return NULL;
1372                 }
1373
1374                 // Check it's NAND
1375                 if(mtd->type != MTD_NANDFLASH)
1376                 {
1377                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1378                         return NULL;
1379                 }
1380
1381                 T(YAFFS_TRACE_OS,(" erase %p\n",mtd->erase));
1382                 T(YAFFS_TRACE_OS,(" read %p\n",mtd->read));
1383                 T(YAFFS_TRACE_OS,(" write %p\n",mtd->write));
1384                 T(YAFFS_TRACE_OS,(" readoob %p\n",mtd->read_oob));
1385                 T(YAFFS_TRACE_OS,(" writeoob %p\n",mtd->write_oob));
1386                 T(YAFFS_TRACE_OS,(" block_isbad %p\n",mtd->block_isbad));
1387                 T(YAFFS_TRACE_OS,(" block_markbad %p\n",mtd->block_markbad));
1388                 T(YAFFS_TRACE_OS,(" oobblock %d\n",mtd->oobblock));
1389                 T(YAFFS_TRACE_OS,(" oobsize %d\n",mtd->oobsize));
1390                 T(YAFFS_TRACE_OS,(" erasesize %d\n",mtd->erasesize));
1391                 T(YAFFS_TRACE_OS,(" size %d\n",mtd->size));
1392
1393                 if(yaffsVersion == 2)
1394                 {
1395                         // Check for version 2 style functions
1396                         if(!mtd->erase ||
1397                            !mtd->block_isbad ||
1398                            !mtd->block_markbad ||
1399                            !mtd->read  ||
1400                            !mtd->write ||
1401 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1402                            !mtd->write_ecc ||
1403                            !mtd->read_ecc ||
1404 #endif
1405                            !mtd->read_oob ||
1406                            !mtd->write_oob )
1407                         {
1408                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1409                                 return NULL;
1410                         }
1411
1412                         if(mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1413                            mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE)
1414                         {
1415                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1416                                 return NULL;
1417                         }               }
1418                 else
1419                 {
1420                         // Check for V1 style functions
1421                         if(!mtd->erase ||
1422                            !mtd->read  ||
1423                            !mtd->write ||
1424 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1425                            !mtd->write_ecc ||
1426                            !mtd->read_ecc ||
1427 #endif
1428                            !mtd->read_oob ||
1429                            !mtd->write_oob )
1430                         {
1431                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1432                                 return NULL;
1433                         }
1434
1435                         if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1436                            mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1437                         {
1438                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1439                                 return NULL;
1440                         }
1441                 }
1442
1443
1444                         // OK, so if we got here, we have an MTD that's NAND and looks
1445                         // like it has the right capabilities
1446                         // Set the yaffs_Device up for mtd
1447
1448 //#if defined(CONFIG_KERNEL_2_5)
1449 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1450                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1451 #else
1452                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1453 #endif
1454                 if(!dev)
1455                 {
1456                         // Deep shit could not allocate device structure
1457                         T(YAFFS_TRACE_ALWAYS,("yaffs_read_super: Failed trying to allocate yaffs_Device. \n"));
1458                         return NULL;
1459                 }
1460
1461                 memset(dev,0,sizeof(yaffs_Device));
1462                 dev->genericDevice = mtd;
1463                 dev->name = mtd->name;
1464
1465                 // Set up the memory size parameters....
1466
1467                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1468                 dev->startBlock = 0;
1469                 dev->endBlock = nBlocks - 1;
1470                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1471                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1472                 dev->nReservedBlocks = 5;
1473                 dev->nShortOpCaches = 10; // Enable short op caching
1474
1475
1476                 // ... and the functions.
1477                 if(yaffsVersion == 2)
1478                 {
1479                         dev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND;
1480                         dev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND;
1481                         dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1482                         dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1483                         dev->spareBuffer = YMALLOC(mtd->oobsize);
1484                         dev->isYaffs2 = 1;
1485                         dev->nBytesPerChunk = mtd->oobblock;
1486                         dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1487                         nBlocks = mtd->size / mtd->erasesize;
1488                         dev->startBlock = 0;
1489                         dev->endBlock = nBlocks - 1;
1490                 }
1491                 else
1492                 {
1493                         dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1494                         dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1495                         dev->isYaffs2 = 0;
1496                 }
1497                 // ... and common functions
1498                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1499                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1500
1501                 dev->putSuperFunc = yaffs_MTDPutSuper;
1502
1503 #ifdef CONFIG_YAFFS_USE_NANDECC
1504                 dev->useNANDECC = 1;
1505 #endif
1506 #endif
1507         }
1508
1509         /* we assume this is protected by lock_kernel() in mount/umount */
1510         list_add_tail(&dev->devList, &yaffs_dev_list);
1511
1512         init_MUTEX(&dev->grossLock);
1513
1514
1515         yaffs_GrossLock(dev);
1516
1517         err = yaffs_GutsInitialise(dev);
1518
1519         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised %s\n", (err == YAFFS_OK) ? "OK" : "FAILED"));
1520
1521         // Create root inode
1522         if(err == YAFFS_OK)
1523           inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(dev));
1524
1525         yaffs_GrossUnlock(dev);
1526
1527         if (!inode)
1528                 return NULL;
1529
1530 // added NCB
1531         inode->i_op = & yaffs_dir_inode_operations;
1532         inode->i_fop = & yaffs_dir_operations;
1533
1534         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1535
1536
1537         root = d_alloc_root(inode);
1538
1539         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1540
1541         if (!root) {
1542                 iput(inode);
1543                 return NULL;
1544         }
1545         sb->s_root = root;
1546
1547         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1548         return sb;
1549 }
1550
1551
1552
1553 #ifdef CONFIG_YAFFS_YAFFS1
1554
1555 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1556 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1557 {
1558          return yaffs_internal_read_super(1,0,sb,data,silent) ? 0 : -1;
1559 }
1560
1561 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1562 {
1563
1564     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1565 }
1566
1567 /* changes NCB 2.5.70 */
1568 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1569 static struct file_system_type yaffs_fs_type = {
1570         .owner          = THIS_MODULE,
1571         .name           = "yaffs",
1572         .get_sb         = yaffs_read_super,
1573         .kill_sb        = kill_block_super,
1574 //      .kill_sb        = kill_litter_super,
1575         .fs_flags       = FS_REQUIRES_DEV,
1576 };
1577 #else
1578 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1579 {
1580         return yaffs_internal_read_super(1,0,sb,data,silent);
1581 }
1582
1583 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1584 #endif
1585
1586 #endif // CONFIG_YAFFS_YAFFS1
1587
1588 #ifdef CONFIG_YAFFS_YAFFS2
1589
1590 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1591 static int yaffs2_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1592 {
1593          return yaffs_internal_read_super(2,0,sb,data,silent) ? 0 : -1;
1594 }
1595
1596 static struct super_block *yaffs2_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1597 {
1598
1599     return get_sb_bdev(fs, flags, dev_name, data, yaffs2_internal_read_super_mtd);
1600 }
1601
1602 /* changes NCB 2.5.70 */
1603 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1604 static struct file_system_type yaffs2_fs_type = {
1605         .owner          = THIS_MODULE,
1606         .name           = "yaffs2",
1607         .get_sb         = yaffs2_read_super,
1608         .kill_sb        = kill_block_super,
1609 //      .kill_sb        = kill_litter_super,
1610         .fs_flags       = FS_REQUIRES_DEV,
1611 };
1612 #else
1613 static struct super_block *yaffs2_read_super(struct super_block * sb, void * data, int silent)
1614 {
1615         return yaffs_internal_read_super(2,0,sb,data,silent);
1616 }
1617
1618 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, FS_REQUIRES_DEV);
1619 #endif
1620
1621 #endif // CONFIG_YAFFS_YAFFS2
1622
1623
1624 #ifdef CONFIG_YAFFS_RAM_ENABLED
1625
1626 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1627 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1628 {
1629          return yaffs_internal_read_super(1,1,sb,data,silent) ? 0 : -1;
1630 }
1631
1632 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1633 {
1634
1635     return get_sb_nodev(fs, flags, data, yaffs_internal_read_super_ram);
1636 }
1637
1638
1639 static struct file_system_type yaffs_ram_fs_type = {
1640         .owner          = THIS_MODULE,
1641         .name           = "yaffsram",
1642         .get_sb         = yaffs_ram_read_super,
1643         .kill_sb        = kill_litter_super,
1644         .fs_flags       = 0 ,
1645 };
1646 #else
1647 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1648 {
1649         return yaffs_internal_read_super(1,1,sb,data,silent);
1650 }
1651
1652 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1653 #endif
1654
1655 #endif // CONFIG_YAFFS_RAM_ENABLED
1656
1657 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1658
1659 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1660 static int yaffs2_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1661 {
1662          return yaffs_internal_read_super(2,1,sb,data,silent) ? 0 : -1;
1663 }
1664
1665 static struct super_block *yaffs2_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1666 {
1667
1668     return get_sb_nodev(fs, flags, data, yaffs2_internal_read_super_ram);
1669 }
1670
1671
1672 static struct file_system_type yaffs2_ram_fs_type = {
1673         .owner          = THIS_MODULE,
1674         .name           = "yaffs2ram",
1675         .get_sb         = yaffs2_ram_read_super,
1676         .kill_sb        = kill_litter_super,
1677         .fs_flags       = 0 ,
1678 };
1679 #else
1680 static struct super_block *yaffs2_ram_read_super(struct super_block * sb, void * data, int silent)
1681 {
1682         return yaffs_internal_read_super(2,1,sb,data,silent);
1683 }
1684
1685 static DECLARE_FSTYPE(yaffs2_ram_fs_type, "yaffs2ram", yaffs2_ram_read_super, FS_SINGLE);
1686 #endif
1687
1688 #endif // CONFIG_YAFFS2_RAM_ENABLED
1689
1690
1691
1692 static struct proc_dir_entry *my_proc_entry;
1693
1694 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev)
1695 {
1696         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1697         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1698         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1699         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1700         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1701         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1702         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1703         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1704         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1705         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1706         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1707         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1708         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1709         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1710         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1711         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1712         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1713         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1714         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1715         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1716         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1717         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1718         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1719         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1720         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1721         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1722         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1723         buf +=sprintf(buf,"isYaffs2........... %d\n",dev->isYaffs2);
1724
1725         return buf;
1726 }
1727
1728 static int  yaffs_proc_read(
1729         char *page,
1730         char **start,
1731         off_t offset,
1732         int count,
1733         int *eof,
1734         void *data
1735         )
1736 {
1737         struct list_head *item;
1738         char *buf = page;
1739         int step = offset;
1740         int n = 0;
1741
1742         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
1743          * We use 'offset' (*ppos) to indicate where we are in devList.
1744          * This also assumes the user has posted a read buffer large
1745          * enough to hold the complete output; but that's life in /proc.
1746          */
1747
1748         *(int *)start = 1;
1749
1750         /* Print header first */
1751         if (step == 0) {
1752                 buf += sprintf(buf, "YAFFS built:" __DATE__ " "__TIME__
1753                 "\n%s\n%s\n", yaffs_fs_c_version, yaffs_guts_c_version);
1754         }
1755
1756         /* hold lock_kernel while traversing yaffs_dev_list */
1757         lock_kernel();
1758
1759         /* Locate and print the Nth entry.  Order N-squared but N is small. */
1760         list_for_each(item, &yaffs_dev_list) {
1761                 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
1762                 if (n < step) {
1763                         n++;
1764                         continue;
1765                 }
1766                 buf += sprintf(buf,"\nDevice %d \"%s\"\n", n, dev->name);
1767                 buf = yaffs_dump_dev(buf, dev);
1768                 break;
1769         }
1770         unlock_kernel();
1771
1772         return buf-page < count ? buf-page : count;
1773 }
1774
1775 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1776 static int  yaffs_proc_ram_write(
1777         char *page,
1778         char **start,
1779         off_t offset,
1780         int count,
1781         int *eof,
1782         void *data
1783         )
1784 {
1785
1786         printk(KERN_DEBUG "yaffs write size %d\n",count);
1787         return count;
1788 }
1789 #endif
1790
1791 // Stuff to handle installation of file systems
1792 struct file_system_to_install
1793 {
1794    struct file_system_type *fst;
1795    int installed;
1796 };
1797
1798 static struct file_system_to_install fs_to_install[] =
1799 {
1800 #ifdef CONFIG_YAFFS_RAM_ENABLED
1801      { &yaffs_ram_fs_type, 0},
1802 #endif
1803 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1804      { &yaffs2_ram_fs_type,0},
1805 #endif
1806 #ifdef CONFIG_YAFFS_YAFFS1
1807      { &yaffs_fs_type,0},
1808 #endif
1809 #ifdef CONFIG_YAFFS_YAFFS2
1810      { &yaffs2_fs_type,0},
1811 #endif
1812      { NULL,0}
1813 };
1814
1815 static int __init init_yaffs_fs(void)
1816 {
1817         int error = 0;
1818         struct file_system_to_install *fsinst;
1819
1820    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
1821
1822
1823
1824     /* Install the proc_fs entry */
1825     my_proc_entry = create_proc_read_entry("yaffs",
1826                                            S_IRUGO | S_IFREG,
1827                                            &proc_root,
1828                                            yaffs_proc_read,
1829                                            NULL);
1830     if(!my_proc_entry)
1831     {
1832        return -ENOMEM;
1833     }
1834
1835
1836
1837     // Now add the file system entries
1838
1839     fsinst = fs_to_install;
1840
1841     while(fsinst->fst && !error)
1842     {
1843       error = register_filesystem(fsinst->fst);
1844       if(!error)
1845       {
1846           fsinst->installed = 1;
1847       }
1848       fsinst++;
1849     }
1850
1851     // Any errors? uninstall
1852     if(error)
1853     {
1854             fsinst = fs_to_install;
1855
1856             while(fsinst->fst)
1857             {
1858               if(fsinst->installed)
1859               {
1860                 unregister_filesystem(fsinst->fst);
1861                 fsinst->installed = 0;
1862               }
1863               fsinst++;
1864             }
1865     }
1866
1867     return error;
1868 }
1869
1870 static void __exit exit_yaffs_fs(void)
1871 {
1872
1873    struct file_system_to_install *fsinst;
1874
1875    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " removing. \n"));
1876
1877    remove_proc_entry("yaffs",&proc_root);
1878
1879     fsinst = fs_to_install;
1880
1881     while(fsinst->fst)
1882     {
1883       if(fsinst->installed)
1884       {
1885         unregister_filesystem(fsinst->fst);
1886         fsinst->installed = 0;
1887       }
1888       fsinst++;
1889     }
1890
1891 }
1892
1893 module_init(init_yaffs_fs)
1894 module_exit(exit_yaffs_fs)
1895
1896 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
1897 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002,2003,2004");
1898 MODULE_LICENSE("GPL");
1899
1900