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 1.9 2005-07-19 20:41:59 charles Exp $";
  34 extern const char *yaffs_guts_c_version;
  35
  36
  37
  38 #include <linux/config.h>
  39 #include <linux/kernel.h>
  40 #include <linux/module.h>
  41 #include <linux/version.h>
  42 #include <linux/slab.h>
  43 #include <linux/init.h>
  44 #include <linux/list.h>
  45 #include <linux/fs.h>
  46 #include <linux/proc_fs.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 kdevname(x) cdevname(to_kdev_t(x))
  60 #define kdevname(x) "(unavailable)"     // temporary fix
  61
  62 #else
  63
  64 #include <linux/locks.h>
  65
  66 #endif
  67
  68 #include <asm/uaccess.h>
  69
  70 #include "yportenv.h"
  71 #include "yaffs_guts.h"
  72
  73
  74
  75
  76 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
  77 //unsigned yaffs_traceMask = 0xFFFFFFFF;
  78
  79
  80 #ifdef CONFIG_YAFFS_RAM_ENABLED
  81 #include "yaffs_nandemul.h"
  82 // 2 MB of RAM for emulation
  83 #define YAFFS_RAM_EMULATION_SIZE  0x200000
  84 #endif //CONFIG_YAFFS_RAM_ENABLED
  85
  86 #if CONFIG_YAFFS2_RAM_ENABLED
  87 #include "yaffs_nandemul2k.h"
  88 #endif
  89
  90 #ifdef CONFIG_YAFFS_MTD_ENABLED
  91 #include <linux/mtd/mtd.h>
  92 #include "yaffs_mtdif.h"
  93 #include "yaffs_mtdif2.h"
  94 #endif //CONFIG_YAFFS_MTD_ENABLED
  95
  96 //#define T(x) printk x
  97
  98
  99
 100 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
 101 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
 102 //NCB #define yaffs_SuperToDevice(sb)   ((yaffs_Device *)sb->u.generic_sbp)
 103
 104 //#if defined(CONFIG_KERNEL_2_5)
 105 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 106 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
 107 #else
 108 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 109 #endif
 110
 111
 112 static void yaffs_put_super(struct super_block *sb);
 113
 114 #if 0
 115 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos);
 116 #endif
 117
 118 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
 119
 120 static int yaffs_file_flush(struct file* file);
 121
 122 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
 123
 124 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 125
 126 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 127 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 128 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n);
 129 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n);
 130 #else
 131 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 132 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
 133 #endif
 134 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
 135 static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
 136 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
 137 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
 138
 139 //#if defined(CONFIG_KERNEL_2_5)
 140 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 141 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
 142 #else
 143 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
 144 #endif
 145 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
 146 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 147
 148 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 149 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 150 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 151 #else
 152 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 153 #endif
 154 static void yaffs_read_inode (struct inode *inode);
 155
 156 //#if defined(CONFIG_KERNEL_2_5)
 157 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 158 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data);
 159 #else
 160 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent);
 161 #endif
 162
 163 static void yaffs_put_inode (struct inode *inode);
 164 static void yaffs_delete_inode(struct inode *);
 165 static void yaffs_clear_inode(struct inode *);
 166
 167 static int yaffs_readpage(struct file *file, struct page * page);
 168 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 169 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 170 #else
 171 static int yaffs_writepage(struct page *page);
 172 #endif
 173 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 174 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 175
 176 static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen);
 177 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 178
 179
 180
 181
 182 static struct address_space_operations yaffs_file_address_operations = {
 183         .readpage:              yaffs_readpage,
 184         .writepage:             yaffs_writepage,
 185         .prepare_write: yaffs_prepare_write,
 186         .commit_write:  yaffs_commit_write
 187 };
 188
 189
 190 static struct file_operations yaffs_file_operations = {
 191
 192         .read:          generic_file_read,
 193         .write:         generic_file_write,
 194
 195         .mmap:          generic_file_mmap,
 196         .flush:         yaffs_file_flush,
 197         .fsync:         yaffs_sync_object,
 198 };
 199
 200
 201 static struct inode_operations yaffs_file_inode_operations = {
 202         .setattr:       yaffs_setattr,
 203 };
 204
 205
 206 struct inode_operations yaffs_symlink_inode_operations =
 207 {
 208         .readlink:      yaffs_readlink,
 209         .follow_link:   yaffs_follow_link,
 210         .setattr:       yaffs_setattr
 211 };
 212
 213 static struct inode_operations yaffs_dir_inode_operations = {
 214         .create:                yaffs_create,
 215         .lookup:                yaffs_lookup,
 216         .link:          yaffs_link,
 217         .unlink:                yaffs_unlink,
 218         .symlink:       yaffs_symlink,
 219         .mkdir:         yaffs_mkdir,
 220         .rmdir:         yaffs_unlink,
 221         .mknod:         yaffs_mknod,
 222         .rename:                yaffs_rename,
 223         .setattr:       yaffs_setattr,
 224 };
 225
 226 static struct file_operations yaffs_dir_operations = {
 227         .read:          generic_read_dir,
 228         .readdir:       yaffs_readdir,
 229         .fsync:         yaffs_sync_object,
 230 };
 231
 232
 233 static struct super_operations yaffs_super_ops = {
 234         .statfs:                        yaffs_statfs,
 235         .read_inode:            yaffs_read_inode,
 236         .put_inode:             yaffs_put_inode,
 237         .put_super:             yaffs_put_super,
 238         .delete_inode:          yaffs_delete_inode,
 239         .clear_inode:           yaffs_clear_inode,
 240 };
 241
 242
 243
 244 static void yaffs_GrossLock(yaffs_Device *dev)
 245 {
 246         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
 247
 248         down(&dev->grossLock);
 249 }
 250
 251 static void yaffs_GrossUnlock(yaffs_Device *dev)
 252 {
 253         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
 254         up(&dev->grossLock);
 255
 256 }
 257
 258 static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
 259 {
 260         unsigned char *alias;
 261         int ret;
 262
 263         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 264
 265
 266         yaffs_GrossLock(dev);
 267
 268         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 269
 270         yaffs_GrossUnlock(dev);
 271
 272         if(!alias)
 273                 return -ENOMEM;
 274
 275         ret = vfs_readlink(dentry, buffer, buflen, alias);
 276         kfree(alias);
 277         return ret;
 278 }
 279
 280 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 281 {
 282         unsigned char *alias;
 283         int ret;
 284         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 285
 286
 287         yaffs_GrossLock(dev);
 288
 289         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 290
 291         yaffs_GrossUnlock(dev);
 292
 293         if(!alias)
 294                 return -ENOMEM;
 295
 296         ret = vfs_follow_link(nd,alias);
 297         kfree(alias);
 298         return ret;
 299 }
 300
 301
 302 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 303
 304 /*
 305  * Lookup is used to find objects in the fs
 306  */
 307 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 308 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 309
 310 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 311 #else
 312 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 313 #endif
 314 {
 315         yaffs_Object *obj;
 316         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 317
 318         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 319
 320
 321         yaffs_GrossLock(dev);
 322
 323
 324         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 325
 326         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 327
 328         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 329
 330
 331
 332         if(obj)
 333         {
 334                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 335
 336                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode,0,obj);
 337
 338                 if(inode)
 339                 {
 340                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
 341 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 342 #if 0
 343                         //dget(dentry); // try to solve directory bug
 344                         d_add(dentry,inode);
 345
 346                         yaffs_GrossUnlock(dev);
 347
 348                         // return dentry;
 349                         return NULL;
 350 #endif
 351                 }
 352
 353         }
 354         else
 355         {
 356                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
 357
 358         }
 359         yaffs_GrossUnlock(dev);
 360
 361 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 362         d_add(dentry,inode);
 363
 364         return NULL;
 365         //      return (ERR_PTR(-EIO));
 366
 367 }
 368
 369 // For now put inode is just for debugging
 370 // Put inode is called when the inode **structure** is put.
 371 static void yaffs_put_inode(struct inode *inode)
 372 {
 373         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 374
 375 }
 376
 377 // clear is called to tell the fs to release any per-inode data it holds
 378 static void yaffs_clear_inode(struct inode *inode)
 379 {
 380         yaffs_Object *obj;
 381         yaffs_Device *dev;
 382
 383         obj = yaffs_InodeToObject(inode);
 384
 385         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 386                 obj ? "object exists" : "null object"));
 387
 388         if(obj)
 389         {
 390                 dev = obj->myDev;
 391                 yaffs_GrossLock(dev);
 392
 393                 // Clear the association between the inode ant the yaffs_Object.
 394                 obj->myInode = NULL;
 395                 inode->u.generic_ip = NULL;
 396
 397                 // If the object freeing was deferred, then the real free happens now.
 398                 // This should fix the inode inconsistency problem.
 399
 400                 yaffs_HandleDeferedFree(obj);
 401
 402                 yaffs_GrossUnlock(dev);
 403         }
 404
 405
 406 }
 407
 408 // delete is called when the link count is zero and the inode
 409 // is put (ie. nobody wants to know about it anymore, time to
 410 // delete the file).
 411 // NB Must call clear_inode()
 412 static void yaffs_delete_inode(struct inode *inode)
 413 {
 414         yaffs_Object *obj = yaffs_InodeToObject(inode);
 415         yaffs_Device *dev;
 416
 417         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 418                 obj ? "object exists" : "null object"));
 419
 420         if(obj)
 421         {
 422                 dev = obj->myDev;
 423                 yaffs_GrossLock(dev);
 424                 yaffs_DeleteFile(obj);
 425                 yaffs_GrossUnlock(dev);
 426         }
 427         clear_inode(inode);
 428 }
 429
 430
 431 static int yaffs_file_flush(struct file* file)
 432 {
 433         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 434
 435         yaffs_Device *dev = obj->myDev;
 436
 437         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 438                                 obj->dirty ? "dirty" : "clean"));
 439
 440         yaffs_GrossLock(dev);
 441
 442     yaffs_FlushFile(obj,1);
 443
 444         yaffs_GrossUnlock(dev);
 445
 446     return 0;
 447 }
 448
 449
 450
 451 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 452 {
 453         // Lifted from jffs2
 454
 455         yaffs_Object *obj;
 456         unsigned char *pg_buf;
 457         int ret;
 458
 459         yaffs_Device *dev;
 460
 461         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 462                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 463
 464         obj  = yaffs_DentryToObject(f->f_dentry);
 465
 466         dev = obj->myDev;
 467
 468
 469 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 470         BUG_ON(!PageLocked(pg));
 471 #else
 472         if (!PageLocked(pg))
 473                 PAGE_BUG(pg);
 474 #endif
 475
 476         pg_buf = kmap(pg);
 477         /* FIXME: Can kmap fail? */
 478
 479         yaffs_GrossLock(dev);
 480
 481         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 482
 483         yaffs_GrossUnlock(dev);
 484
 485         if(ret >= 0) ret = 0;
 486
 487         if (ret) {
 488                 ClearPageUptodate(pg);
 489                 SetPageError(pg);
 490         } else {
 491                 SetPageUptodate(pg);
 492                 ClearPageError(pg);
 493         }
 494
 495         flush_dcache_page(pg);
 496         kunmap(pg);
 497
 498
 499         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
 500         return ret;
 501 }
 502
 503 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 504 {
 505         int ret = yaffs_readpage_nolock(f,pg);
 506         UnlockPage(pg);
 507         return ret;
 508 }
 509
 510 static int yaffs_readpage(struct file *f, struct page * pg)
 511 {
 512         return yaffs_readpage_unlock(f,pg);
 513 }
 514
 515 // writepage inspired by/stolen from smbfs
 516 //
 517
 518 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 519 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 520 #else
 521 static int yaffs_writepage(struct page *page)
 522 #endif
 523 {
 524         struct address_space *mapping = page->mapping;
 525         struct inode *inode;
 526         unsigned long end_index;
 527         char *buffer;
 528         yaffs_Object *obj;
 529         int nWritten = 0;
 530         unsigned nBytes;
 531
 532         if (!mapping)
 533                 BUG();
 534         inode = mapping->host;
 535         if (!inode)
 536                 BUG();
 537
 538         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 539
 540         /* easy case */
 541         if (page->index < end_index)
 542         {
 543                 nBytes = PAGE_CACHE_SIZE;
 544         }
 545         else
 546         {
 547                 nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
 548         }
 549         //  What's happening here?
 550         ///* OK, are we completely out? */
 551         //if (page->index >= end_index+1 || !offset)
 552         //      return -EIO;
 553
 554         get_page(page);
 555
 556
 557         buffer = kmap(page);
 558
 559         obj = yaffs_InodeToObject(inode);
 560         yaffs_GrossLock(obj->myDev);
 561
 562
 563         nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes,0);
 564
 565         yaffs_GrossUnlock(obj->myDev);
 566
 567         kunmap(page);
 568         SetPageUptodate(page);
 569         UnlockPage(page);
 570         put_page(page);
 571
 572         return (nWritten == nBytes) ? 0  : -ENOSPC;
 573 }
 574
 575
 576
 577 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 578 {
 579
 580         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
 581         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 582                 return  yaffs_readpage_nolock(f,pg);
 583
 584         return 0;
 585
 586 }
 587
 588 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 589 {
 590
 591         void *addr = page_address(pg) + offset;
 592         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 593         int nBytes = to - offset;
 594         int nWritten;
 595
 596         unsigned spos = pos;
 597         unsigned saddr = (unsigned)addr;
 598
 599         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 600
 601         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 602
 603         if(nWritten != nBytes)
 604         {
 605                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 606                 SetPageError(pg);
 607                 ClearPageUptodate(pg);
 608         }
 609         else
 610         {
 611                 SetPageUptodate(pg);
 612         }
 613
 614         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 615
 616         return nWritten;
 617
 618 }
 619
 620
 621
 622 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 623 {
 624         if (inode && obj)
 625         {
 626                 inode->i_ino = obj->objectId;
 627                 inode->i_mode = obj->yst_mode;
 628                 inode->i_uid = obj->yst_uid;
 629                 inode->i_gid = obj->yst_gid;
 630                 inode->i_blksize = inode->i_sb->s_blocksize;
 631 //#if defined(CONFIG_KERNEL_2_5)
 632 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 633
 634                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 635                 inode->i_atime.tv_sec = (time_t)(obj->yst_atime);
 636                 inode->i_atime.tv_nsec = 0;
 637                 inode->i_mtime.tv_sec = (time_t)obj->yst_mtime;
 638                 inode->i_mtime.tv_nsec =0;
 639                 inode->i_ctime.tv_sec = (time_t)obj->yst_ctime;
 640                 inode->i_ctime.tv_nsec = 0;
 641 #else
 642                 inode->i_rdev = obj->yst_rdev;
 643                 inode->i_atime = obj->yst_atime;
 644                 inode->i_mtime = obj->yst_mtime;
 645                 inode->i_ctime = obj->yst_ctime;
 646 #endif
 647                 inode->i_size = yaffs_GetObjectFileLength(obj);
 648                 inode->i_blocks = (inode->i_size + 511) >> 9;
 649
 650                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 651
 652                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 653                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 654
 655                 switch (obj->yst_mode & S_IFMT)
 656                 {
 657                         default: // fifo, device or socket
 658 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 659                                init_special_inode(inode, obj->yst_mode,old_decode_dev(obj->yst_rdev));
 660 #else
 661                                  init_special_inode(inode, obj->yst_mode,(dev_t)(obj->yst_rdev));
 662 #endif
 663                         break;
 664                         case S_IFREG:   // file
 665                                 inode->i_op = &yaffs_file_inode_operations;
 666                                 inode->i_fop = &yaffs_file_operations;
 667                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 668                                 break;
 669                         case S_IFDIR:   // directory
 670                                 inode->i_op = &yaffs_dir_inode_operations;
 671                                 inode->i_fop = &yaffs_dir_operations;
 672                                 break;
 673                         case S_IFLNK:   // symlink
 674                                 inode->i_op = &yaffs_symlink_inode_operations;
 675                                 break;
 676                 }
 677
 678
 679                 inode->u.generic_ip = obj;
 680                 obj->myInode = inode;
 681
 682         }
 683         else
 684         {
 685                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 686         }
 687
 688 }
 689
 690 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 691 {
 692         struct inode * inode;
 693
 694         if(!sb)
 695         {
 696           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL super_block!!\n"));
 697           return NULL;
 698
 699         }
 700
 701         if(!obj)
 702         {
 703           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL object!!\n"));
 704           return NULL;
 705
 706         }
 707
 708         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 709
 710         inode = iget(sb,obj->objectId);
 711
 712         // NB Side effect: iget calls back to yaffs_read_inode().
 713         // iget also increments the inode's i_count
 714
 715         return inode;
 716 }
 717
 718 #if 0
 719
 720 // No longer used because we use generic rw */
 721 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 722 {
 723         yaffs_Object *obj;
 724         int nRead,ipos;
 725         struct inode *inode;
 726         yaffs_Device *dev;
 727
 728         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n"));
 729
 730         obj  = yaffs_DentryToObject(f->f_dentry);
 731
 732         dev = obj->myDev;
 733
 734         yaffs_GrossLock(dev);
 735
 736         inode = f->f_dentry->d_inode;
 737
 738         if (*pos < inode->i_size)
 739         {
 740                         if (*pos + n > inode->i_size)
 741                         {
 742                                 n = inode->i_size - *pos;
 743                         }
 744         }
 745         else
 746         {
 747                 n = 0;
 748         }
 749
 750         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 751         if(nRead > 0)
 752         {
 753                 f->f_pos += nRead;
 754         }
 755
 756         yaffs_GrossUnlock(dev);
 757
 758         ipos = *pos;
 759
 760         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 761         return nRead;
 762
 763 }
 764
 765 #endif
 766
 767 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 768 {
 769         yaffs_Object *obj;
 770         int nWritten,ipos;
 771         struct inode *inode;
 772         yaffs_Device *dev;
 773
 774
 775         obj  = yaffs_DentryToObject(f->f_dentry);
 776
 777         dev = obj->myDev;
 778
 779         yaffs_GrossLock(dev);
 780
 781         inode = f->f_dentry->d_inode;
 782
 783         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 784         {
 785                 ipos = inode->i_size;
 786         }
 787         else
 788         {
 789                 ipos = *pos;
 790         }
 791
 792
 793         if(!obj)
 794         {
 795                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 796         }
 797         else
 798         {
 799                 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));
 800         }
 801
 802         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n,0);
 803
 804         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 805         if(nWritten > 0)
 806         {
 807                 ipos += nWritten;
 808                 *pos = ipos;
 809                 if(ipos > inode->i_size)
 810                 {
 811                         inode->i_size = ipos;
 812                         inode->i_blocks = (ipos + 511)>>9;
 813
 814                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 815                 }
 816
 817         }
 818         yaffs_GrossUnlock(dev);
 819
 820         return nWritten != n ? -ENOSPC : nWritten;
 821 }
 822
 823
 824
 825 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 826 {
 827         yaffs_Object *obj;
 828         yaffs_Device *dev;
 829         struct inode *inode = f->f_dentry->d_inode;
 830         unsigned long offset, curoffs;
 831         struct list_head *i;
 832         yaffs_Object *l;
 833
 834         char name[YAFFS_MAX_NAME_LENGTH +1];
 835
 836         obj =  yaffs_DentryToObject(f->f_dentry);
 837         dev = obj->myDev;
 838
 839         yaffs_GrossLock(dev);
 840
 841         offset = f->f_pos;
 842
 843         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 844
 845         if(offset == 0)
 846         {
 847         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 848                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 849                 {
 850                         goto out;
 851                 }
 852                 offset++;
 853                 f->f_pos++;
 854         }
 855         if(offset == 1)
 856         {
 857                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 858                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 859                 {
 860                         goto out;
 861                 }
 862                 offset++;
 863                 f->f_pos++;
 864         }
 865
 866         curoffs = 1;
 867
 868         list_for_each(i,&obj->variant.directoryVariant.children)
 869         {
 870                 curoffs++;
 871                 if(curoffs >= offset)
 872                 {
 873                         l = list_entry(i, yaffs_Object,siblings);
 874
 875                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 876                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 877
 878                         if(filldir(dirent,
 879                                            name,
 880                                            strlen(name),
 881                                            offset,
 882                                            yaffs_GetObjectInode(l),
 883                                            yaffs_GetObjectType(l))
 884                                            < 0)
 885                         {
 886                                 goto up_and_out;
 887                         }
 888
 889                         offset++;
 890                         f->f_pos++;
 891                 }
 892         }
 893
 894   up_and_out:
 895   out:
 896
 897     yaffs_GrossUnlock(dev);
 898
 899         return 0;
 900 }
 901
 902
 903 /*
 904  * File creation. Allocate an inode, and we're done..
 905  */
 906 //#if defined(CONFIG_KERNEL_2_5)
 907 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 908 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 909 #else
 910 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 911 #endif
 912 {
 913         struct inode *inode;
 914
 915         yaffs_Object *obj = NULL;
 916         yaffs_Device *dev;
 917
 918         yaffs_Object *parent = yaffs_InodeToObject(dir);
 919
 920         int error = -ENOSPC;
 921
 922         if(parent)
 923         {
 924                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 925                                          parent->objectId,parent->variantType));
 926         }
 927         else
 928         {
 929                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 930                 return -EPERM;
 931         }
 932
 933         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 934                                         dentry->d_name.name, mode,rdev));
 935
 936         dev = parent->myDev;
 937
 938         yaffs_GrossLock(dev);
 939
 940         switch (mode & S_IFMT)
 941         {
 942                 default:
 943                         // Special (socket, fifo, device...)
 944                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 945 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 946                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,old_encode_dev(rdev));
 947 #else
 948                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 949 #endif
 950                 break;
 951                 case S_IFREG:   // file
 952                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 953                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 954                         break;
 955                 case S_IFDIR:   // directory
 956                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 957                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 958                         break;
 959                 case S_IFLNK:   // symlink
 960                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 961                         obj = NULL; // Do we ever get here?
 962                         break;
 963         }
 964
 965         if(obj)
 966         {
 967                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 968                 d_instantiate(dentry, inode);
 969                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 970                 error = 0;
 971         }
 972         else
 973         {
 974                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 975                 error = -ENOMEM;
 976         }
 977
 978         yaffs_GrossUnlock(dev);
 979
 980         return error;
 981 }
 982
 983 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 984 {
 985         int retVal;
 986         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 987         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 988 #if 0
 989  // attempt to fix dir bug - didn't work
 990         if(!retVal)
 991         {
 992                 dget(dentry);
 993         }
 994 #endif
 995         return retVal;
 996 }
 997
 998 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 999 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1000 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
1001 #else
1002 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1003 #endif
1004 {
1005         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
1006         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1007 }
1008
1009
1010 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
1011 {
1012         int retVal;
1013
1014         yaffs_Device *dev;
1015
1016
1017         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
1018
1019         dev = yaffs_InodeToObject(dir)->myDev;
1020
1021         yaffs_GrossLock(dev);
1022
1023
1024         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
1025
1026
1027         yaffs_GrossUnlock(dev);
1028
1029         if( retVal == YAFFS_OK)
1030         {
1031                 dentry->d_inode->i_nlink--;
1032                 mark_inode_dirty(dentry->d_inode);
1033                 return 0;
1034         }
1035         else
1036         {
1037                 return -ENOTEMPTY;
1038         }
1039 }
1040
1041
1042 /*
1043  * Create a link...
1044  */
1045 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
1046 {
1047         struct inode *inode = old_dentry->d_inode;
1048         yaffs_Object *obj = NULL;
1049         yaffs_Object *link=NULL;
1050         yaffs_Device *dev;
1051
1052         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
1053
1054         obj = yaffs_InodeToObject(inode);
1055         dev = obj->myDev;
1056
1057         yaffs_GrossLock(dev);
1058
1059         if (!S_ISDIR(inode->i_mode))    // Don't link directories
1060         {
1061                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
1062         }
1063
1064
1065         if(link)
1066         {
1067                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
1068                 d_instantiate(dentry, old_dentry->d_inode);
1069                 atomic_inc(&old_dentry->d_inode->i_count);
1070                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
1071                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
1072
1073         }
1074
1075         yaffs_GrossUnlock(dev);
1076
1077
1078         if(link)
1079         {
1080
1081                 return 0;
1082         }
1083
1084
1085         return -EPERM;
1086 }
1087
1088
1089 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
1090 {
1091         yaffs_Object *obj;
1092         yaffs_Device *dev;
1093
1094         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
1095
1096         dev = yaffs_InodeToObject(dir)->myDev;
1097         yaffs_GrossLock(dev);
1098         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1099                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
1100                                                          symname);
1101         yaffs_GrossUnlock(dev);
1102
1103         if(obj)
1104         {
1105
1106                 struct inode* inode;
1107
1108                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1109                 d_instantiate(dentry, inode);
1110                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
1111                 return 0;
1112         }
1113         else
1114         {
1115                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
1116
1117         }
1118
1119         return -ENOMEM;
1120 }
1121
1122 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
1123 {
1124
1125         yaffs_Object *obj;
1126         yaffs_Device *dev;
1127
1128         obj = yaffs_DentryToObject(dentry);
1129
1130         dev = obj->myDev;
1131
1132         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
1133         yaffs_GrossLock(dev);
1134         yaffs_FlushFile(obj,1);
1135         yaffs_GrossUnlock(dev);
1136         return 0;
1137 }
1138
1139 /*
1140  * The VFS layer already does all the dentry stuff for rename.
1141  *
1142  * NB: POSIX says you can rename an object over an old object of the same name
1143  */
1144 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1145 {
1146         yaffs_Device *dev;
1147         int retVal = YAFFS_FAIL;
1148         int removed = 0;
1149         yaffs_Object *target;
1150
1151         dev = yaffs_InodeToObject(old_dir)->myDev;
1152
1153         yaffs_GrossLock(dev);
1154
1155         // Check if the target is an existing directory that is not empty.
1156         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1157
1158         if(target &&
1159            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1160            !list_empty(&target->variant.directoryVariant.children))
1161         {
1162                 retVal = YAFFS_FAIL;
1163         }
1164         else
1165         {
1166
1167                 // Unlink the target if it exists
1168                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1169
1170
1171                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1172                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1173
1174         }
1175         yaffs_GrossUnlock(dev);
1176
1177         if(retVal == YAFFS_OK)
1178         {
1179                 if(removed == YAFFS_OK)
1180                 {
1181                         new_dentry->d_inode->i_nlink--;
1182                         mark_inode_dirty(new_dentry->d_inode);
1183                 }
1184
1185                 return 0;
1186         }
1187         else
1188         {
1189                 return -ENOTEMPTY;
1190         }
1191
1192
1193 }
1194
1195 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1196 {
1197         struct inode *inode = dentry->d_inode;
1198         int error;
1199         yaffs_Device *dev;
1200
1201         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1202
1203         if((error = inode_change_ok(inode,attr)) == 0)
1204         {
1205
1206                 dev = yaffs_InodeToObject(inode)->myDev;
1207                 yaffs_GrossLock(dev);
1208                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1209                 {
1210                         error = 0;
1211                 }
1212                 else
1213                 {
1214                         error = -EPERM;
1215                 }
1216                 yaffs_GrossUnlock(dev);
1217                 if (!error)
1218                         error = inode_setattr(inode,attr);
1219         }
1220         return error;
1221 }
1222
1223 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
1224 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1225 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1226 #else
1227 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1228 #endif
1229 {
1230
1231
1232         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1233         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1234
1235         yaffs_GrossLock(dev);
1236
1237
1238         buf->f_type = YAFFS_MAGIC;
1239         buf->f_bsize = sb->s_blocksize;
1240         buf->f_namelen = 255;
1241         if(sb->s_blocksize > dev->nBytesPerChunk)
1242         {
1243
1244                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock/
1245                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1246                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1247                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1248         }
1249         else
1250         {
1251
1252                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock *
1253                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1254                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev) *
1255                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1256         }
1257         buf->f_files = 0;
1258         buf->f_ffree = 0;
1259         buf->f_bavail =  buf->f_bfree;
1260
1261         yaffs_GrossUnlock(dev);
1262         return 0;
1263 }
1264
1265 static void yaffs_read_inode (struct inode *inode)
1266 {
1267         // NB This is called as a side effect of other functions and
1268         // thus gross locking should always be in place already.
1269
1270         yaffs_Object *obj ;
1271         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1272
1273         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1274
1275         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1276
1277         yaffs_FillInodeFromObject(inode,obj);
1278
1279 }
1280
1281
1282
1283 // Todo
1284 // Currently we only can report a single partition. Need to use lists here
1285 static yaffs_Device *yaffs_dev;
1286 static yaffs_Device *yaffsram_dev;
1287
1288
1289
1290 static void yaffs_put_super(struct super_block *sb)
1291 {
1292         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1293
1294         yaffs_GrossLock(dev);
1295         if(dev->putSuperFunc)
1296         {
1297                  dev->putSuperFunc(sb);
1298         }
1299         yaffs_Deinitialise(dev);
1300         yaffs_GrossUnlock(dev);
1301
1302         if(dev == yaffs_dev) yaffs_dev = NULL;
1303         if(dev == yaffsram_dev) yaffsram_dev = NULL;
1304
1305         kfree(dev);
1306 }
1307
1308
1309 #ifdef CONFIG_YAFFS_MTD_ENABLED
1310
1311 static void  yaffs_MTDPutSuper(struct super_block *sb)
1312 {
1313
1314         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1315
1316         if(mtd->sync)
1317         {
1318                 mtd->sync(mtd);
1319         }
1320
1321         put_mtd_device(mtd);
1322 }
1323
1324 #endif
1325
1326
1327 static struct super_block *yaffs_internal_read_super(int yaffsVersion,int useRam, struct super_block * sb, void * data, int silent)
1328 {
1329         int nBlocks;
1330         struct inode * inode = NULL;
1331         struct dentry * root;
1332         yaffs_Device *dev;
1333         int err;
1334
1335         sb->s_magic = YAFFS_MAGIC;
1336         sb->s_op = &yaffs_super_ops;
1337
1338         if(!sb)
1339                 printk(KERN_INFO"yaffs: sb is NULL\n");
1340         else if(!sb->s_dev)
1341                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1342         else if(! kdevname(sb->s_dev))
1343                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1344         else
1345                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1346
1347
1348
1349 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1350         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1351         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1352 #else
1353         sb->s_blocksize = PAGE_CACHE_SIZE;
1354         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1355 #endif
1356         T(YAFFS_TRACE_OS,("yaffs_read_super: Using yaffs%d\n",yaffsVersion));
1357         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1358
1359 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1360         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1361 #endif
1362
1363
1364
1365         if(useRam)
1366         {
1367
1368 #ifdef CONFIG_YAFFS_RAM_ENABLED
1369                 // Set the yaffs_Device up for ram emulation
1370
1371
1372 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1373                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1374 #else
1375                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1376 #endif
1377
1378                 if(!dev)
1379                 {
1380                         // Deep shit could not allocate device structure
1381                         T(YAFFS_TRACE_OS,("yaffs_read_super: Failed trying to allocate yaffs_Device.\n"));
1382                         return NULL;
1383                 }
1384
1385                 memset(dev,0,sizeof(yaffs_Device));
1386                 dev->genericDevice = NULL; // Not used for RAM emulation.
1387
1388                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1389                 dev->startBlock = 0;
1390                 dev->endBlock = nBlocks - 1;
1391                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1392                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1393                 dev->nReservedBlocks = 5;
1394
1395                 if(yaffsVersion == 2)
1396                 {
1397                         dev->writeChunkWithTagsToNAND  = nandemul2k_WriteChunkWithTagsToNAND;
1398                         dev->readChunkWithTagsFromNAND = nandemul2k_ReadChunkWithTagsFromNAND;
1399                         dev->markNANDBlockBad          = nandemul2k_MarkNANDBlockBad;
1400                         dev->queryNANDBlock            = nandemul2k_QueryNANDBlock;
1401                         dev->eraseBlockInNAND          = nandemul2k_EraseBlockInNAND;
1402                         dev->initialiseNAND            = nandemul2k_InitialiseNAND;
1403                         dev->isYaffs2 = 1;
1404                         dev->nChunksPerBlock = nandemul2k_GetChunksPerBlock();
1405                         dev->nBytesPerChunk =  nandemul2k_GetBytesPerChunk();;
1406                         nBlocks = nandemul2k_GetNumberOfBlocks();
1407                         dev->startBlock = 0;
1408                         dev->endBlock = nBlocks - 1;
1409                 }
1410                 else
1411                 {
1412                         dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1413                         dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1414                         dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1415                         dev->initialiseNAND = nandemul_InitialiseNAND;
1416                         dev->isYaffs2 = 0;
1417                 }
1418
1419                 yaffsram_dev = dev;
1420
1421 #endif
1422
1423         }
1424         else
1425         {
1426 #ifdef CONFIG_YAFFS_MTD_ENABLED
1427                 struct mtd_info *mtd;
1428
1429                 T(YAFFS_TRACE_ALWAYS,("yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1430                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev)));
1431
1432                 // Check it's an mtd device.....
1433                 if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1434                 {
1435                         return NULL; // This isn't an mtd device
1436                 }
1437
1438                 // Get the device
1439                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1440                 if (!mtd)
1441                 {
1442                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev)));
1443                         return NULL;
1444                 }
1445
1446                 // Check it's NAND
1447                 if(mtd->type != MTD_NANDFLASH)
1448                 {
1449                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1450                         return NULL;
1451                 }
1452
1453                 T(YAFFS_TRACE_OS,(" erase %p\n",mtd->erase));
1454                 T(YAFFS_TRACE_OS,(" read %p\n",mtd->read));
1455                 T(YAFFS_TRACE_OS,(" write %p\n",mtd->write));
1456                 T(YAFFS_TRACE_OS,(" readoob %p\n",mtd->read_oob));
1457                 T(YAFFS_TRACE_OS,(" writeoob %p\n",mtd->write_oob));
1458                 T(YAFFS_TRACE_OS,(" block_isbad %p\n",mtd->block_isbad));
1459                 T(YAFFS_TRACE_OS,(" block_markbad %p\n",mtd->block_markbad));
1460                 T(YAFFS_TRACE_OS,(" oobblock %d\n",mtd->oobblock));
1461                 T(YAFFS_TRACE_OS,(" oobsize %d\n",mtd->oobsize));
1462                 T(YAFFS_TRACE_OS,(" erasesize %d\n",mtd->erasesize));
1463                 T(YAFFS_TRACE_OS,(" size %d\n",mtd->size));
1464
1465                 if(yaffsVersion == 2)
1466                 {
1467                         // Check for version 2 style functions
1468                         if(!mtd->erase ||
1469                            !mtd->block_isbad ||
1470                            !mtd->block_markbad ||
1471                            !mtd->read  ||
1472                            !mtd->write ||
1473 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1474                            !mtd->write_ecc ||
1475                            !mtd->read_ecc ||
1476 #endif
1477                            !mtd->read_oob ||
1478                            !mtd->write_oob )
1479                         {
1480                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1481                                 return NULL;
1482                         }
1483
1484                         if(mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1485                            mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE)
1486                         {
1487                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1488                                 return NULL;
1489                         }               }
1490                 else
1491                 {
1492                         // Check for V1 style functions
1493                         if(!mtd->erase ||
1494                            !mtd->read  ||
1495                            !mtd->write ||
1496 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1497                            !mtd->write_ecc ||
1498                            !mtd->read_ecc ||
1499 #endif
1500                            !mtd->read_oob ||
1501                            !mtd->write_oob )
1502                         {
1503                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1504                                 return NULL;
1505                         }
1506
1507                         if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1508                            mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1509                         {
1510                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1511                                 return NULL;
1512                         }
1513                 }
1514
1515
1516                         // OK, so if we got here, we have an MTD that's NAND and looks
1517                         // like it has the right capabilities
1518                         // Set the yaffs_Device up for mtd
1519
1520 //#if defined(CONFIG_KERNEL_2_5)
1521 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1522                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1523 #else
1524                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1525 #endif
1526                 if(!dev)
1527                 {
1528                         // Deep shit could not allocate device structure
1529                         T(YAFFS_TRACE_ALWAYS,("yaffs_read_super: Failed trying to allocate yaffs_Device. \n"));
1530                         return NULL;
1531                 }
1532
1533                 memset(dev,0,sizeof(yaffs_Device));
1534                 dev->genericDevice = mtd;
1535
1536                 // Set up the memory size parameters....
1537
1538                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1539                 dev->startBlock = 0;
1540                 dev->endBlock = nBlocks - 1;
1541                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1542                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1543                 dev->nReservedBlocks = 5;
1544                 dev->nShortOpCaches = 10; // Enable short op caching
1545
1546
1547                 // ... and the functions.
1548                 if(yaffsVersion == 2)
1549                 {
1550                         dev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND;
1551                         dev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND;
1552                         dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1553                         dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1554                         dev->spareBuffer = YMALLOC(mtd->oobsize);
1555                         dev->isYaffs2 = 1;
1556                         dev->nBytesPerChunk = mtd->oobblock;
1557                         dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1558                         nBlocks = mtd->size / mtd->erasesize;
1559                         dev->startBlock = 0;
1560                         dev->endBlock = nBlocks - 1;
1561                 }
1562                 else
1563                 {
1564                         dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1565                         dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1566                         dev->isYaffs2 = 0;
1567                 }
1568                 // ... and common functions
1569                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1570                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1571
1572                 dev->putSuperFunc = yaffs_MTDPutSuper;
1573
1574 #ifdef CONFIG_YAFFS_USE_NANDECC
1575                 dev->useNANDECC = 1;
1576 #endif
1577
1578                 yaffs_dev = dev;
1579
1580 #endif
1581         }
1582
1583         init_MUTEX(&dev->grossLock);
1584
1585
1586         yaffs_GrossLock(dev);
1587
1588         err = yaffs_GutsInitialise(dev);
1589
1590         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised %s\n", (err == YAFFS_OK) ? "OK" : "FAILED"));
1591
1592         // Create root inode
1593         if(err == YAFFS_OK)
1594           inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(dev));
1595
1596         yaffs_GrossUnlock(dev);
1597
1598         if (!inode)
1599                 return NULL;
1600
1601 // added NCB
1602         inode->i_op = & yaffs_dir_inode_operations;
1603         inode->i_fop = & yaffs_dir_operations;
1604
1605         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1606
1607
1608         root = d_alloc_root(inode);
1609
1610         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1611
1612         if (!root) {
1613                 iput(inode);
1614                 return NULL;
1615         }
1616         sb->s_root = root;
1617
1618         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1619         return sb;
1620 }
1621
1622
1623 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1624 {
1625          return yaffs_internal_read_super(1,1,sb,data,silent) ? 0 : -1;
1626 }
1627 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1628 {
1629          return yaffs_internal_read_super(1,0,sb,data,silent) ? 0 : -1;
1630 }
1631
1632 static int yaffs2_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1633 {
1634          return yaffs_internal_read_super(2,1,sb,data,silent) ? 0 : -1;
1635 }
1636 static int yaffs2_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1637 {
1638          return yaffs_internal_read_super(2,0,sb,data,silent) ? 0 : -1;
1639 }
1640
1641
1642
1643 #ifdef CONFIG_YAFFS_MTD_ENABLED
1644 //#if defined(CONFIG_KERNEL_2_5)
1645 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1646 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1647 {
1648
1649     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1650 }
1651
1652 /* changes NCB 2.5.70 */
1653 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1654 static struct file_system_type yaffs_fs_type = {
1655         .owner          = THIS_MODULE,
1656         .name           = "yaffs",
1657         .get_sb         = yaffs_read_super,
1658         .kill_sb        = kill_block_super,
1659 //      .kill_sb        = kill_litter_super,
1660         .fs_flags       = FS_REQUIRES_DEV,
1661 };
1662 #else
1663 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1664 {
1665         return yaffs_internal_read_super(1,0,sb,data,silent);
1666 }
1667
1668 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1669 #endif
1670
1671 #endif // CONFIG_YAFFS_MTD_ENABLED
1672
1673 #ifdef CONFIG_YAFFS2_MTD_ENABLED
1674
1675 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1676 static struct super_block *yaffs2_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1677 {
1678
1679     return get_sb_bdev(fs, flags, dev_name, data, yaffs2_internal_read_super_mtd);
1680 }
1681
1682 /* changes NCB 2.5.70 */
1683 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1684 static struct file_system_type yaffs2_fs_type = {
1685         .owner          = THIS_MODULE,
1686         .name           = "yaffs2",
1687         .get_sb         = yaffs2_read_super,
1688         .kill_sb        = kill_block_super,
1689 //      .kill_sb        = kill_litter_super,
1690         .fs_flags       = FS_REQUIRES_DEV,
1691 };
1692 #else
1693 static struct super_block *yaffs2_read_super(struct super_block * sb, void * data, int silent)
1694 {
1695         return yaffs_internal_read_super(2,0,sb,data,silent);
1696 }
1697
1698 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, FS_REQUIRES_DEV);
1699 #endif
1700
1701 #endif // CONFIG_YAFFS2_MTD_ENABLED
1702
1703
1704 #ifdef CONFIG_YAFFS_RAM_ENABLED
1705
1706 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1707 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1708 {
1709
1710     return get_sb_nodev(fs, flags, data, yaffs_internal_read_super_ram);
1711 }
1712
1713
1714 static struct file_system_type yaffs_ram_fs_type = {
1715         .owner          = THIS_MODULE,
1716         .name           = "yaffsram",
1717         .get_sb         = yaffs_ram_read_super,
1718         .kill_sb        = kill_litter_super,
1719         .fs_flags       = 0 ,
1720 };
1721 #else
1722 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1723 {
1724         return yaffs_internal_read_super(1,1,sb,data,silent);
1725 }
1726
1727 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1728 #endif
1729
1730 #endif // CONFIG_YAFFS_RAM_ENABLED
1731
1732 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1733
1734 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1735 static struct super_block *yaffs2_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1736 {
1737
1738     return get_sb_nodev(fs, flags, data, yaffs2_internal_read_super_ram);
1739 }
1740
1741
1742 static struct file_system_type yaffs2_ram_fs_type = {
1743         .owner          = THIS_MODULE,
1744         .name           = "yaffs2ram",
1745         .get_sb         = yaffs2_ram_read_super,
1746         .kill_sb        = kill_litter_super,
1747         .fs_flags       = 0 ,
1748 };
1749 #else
1750 static struct super_block *yaffs2_ram_read_super(struct super_block * sb, void * data, int silent)
1751 {
1752         return yaffs_internal_read_super(2,1,sb,data,silent);
1753 }
1754
1755 static DECLARE_FSTYPE(yaffs2_ram_fs_type, "yaffs2ram", yaffs2_ram_read_super, FS_SINGLE);
1756 #endif
1757
1758 #endif // CONFIG_YAFFS2_RAM_ENABLED
1759
1760
1761
1762 static struct proc_dir_entry *my_proc_entry;
1763 static struct proc_dir_entry *my_proc_ram_write_entry;
1764
1765 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
1766 {
1767         buf +=sprintf(buf,"\nDevice %s\n",name);
1768         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1769         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1770         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1771         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1772         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1773         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1774         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1775         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1776         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1777         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1778         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1779         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1780         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1781         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1782         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1783         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1784         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1785         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1786         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1787         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1788         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1789         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1790         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1791         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1792         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1793         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1794         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1795         buf +=sprintf(buf,"isYaffs2........... %d\n",dev->isYaffs2);
1796
1797
1798         return buf;
1799 }
1800
1801 static int  yaffs_proc_read(
1802         char *page,
1803         char **start,
1804         off_t offset,
1805         int count,
1806         int *eof,
1807         void *data
1808         )
1809 {
1810
1811         char my_buffer[3000];
1812         char *buf;
1813         buf = my_buffer;
1814
1815         if (offset > 0) return 0;
1816
1817         /* Fill the buffer and get its length */
1818         buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
1819
1820         if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
1821         if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
1822
1823
1824         strcpy(page,my_buffer);
1825         return strlen(my_buffer);
1826 }
1827
1828
1829 static int  yaffs_proc_ram_write(
1830         char *page,
1831         char **start,
1832         off_t offset,
1833         int count,
1834         int *eof,
1835         void *data
1836         )
1837 {
1838
1839         printk(KERN_DEBUG "yaffs write size %d\n",count);
1840         return count;
1841 }
1842
1843
1844
1845 // Stuff to handle installation of file systems
1846 struct file_system_to_install
1847 {
1848    struct file_system_type *fst;
1849    int installed;
1850 };
1851
1852 static struct file_system_to_install fs_to_install[] =
1853 {
1854 #ifdef CONFIG_YAFFS_RAM_ENABLED
1855      { &yaffs_ram_fs_type, 0},
1856 #endif
1857 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1858      { &yaffs2_ram_fs_type,0},
1859 #endif
1860 #ifdef CONFIG_YAFFS_MTD_ENABLED
1861      { &yaffs_fs_type,0},
1862 #endif
1863 #ifdef CONFIG_YAFFS2_MTD_ENABLED
1864      { &yaffs2_fs_type,0},
1865 #endif
1866      { NULL,0}
1867 };
1868
1869 static int __init init_yaffs_fs(void)
1870 {
1871         int error = 0;
1872         struct file_system_to_install *fsinst;
1873
1874         yaffs_dev = yaffsram_dev = NULL;
1875
1876    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
1877
1878
1879
1880     /* Install the proc_fs entry */
1881     my_proc_entry = create_proc_read_entry("yaffs",
1882                                            S_IRUGO | S_IFREG,
1883                                            &proc_root,
1884                                            yaffs_proc_read,
1885                                            NULL);
1886     if(!my_proc_entry)
1887     {
1888        return -ENOMEM;
1889     }
1890
1891
1892
1893     // Now add the file system entries
1894
1895     fsinst = fs_to_install;
1896
1897     while(fsinst->fst && !error)
1898     {
1899       error = register_filesystem(fsinst->fst);
1900       if(!error)
1901       {
1902           fsinst->installed = 1;
1903       }
1904       fsinst++;
1905     }
1906
1907     // Any errors? uninstall
1908     if(error)
1909     {
1910             fsinst = fs_to_install;
1911
1912             while(fsinst->fst)
1913             {
1914               if(fsinst->installed)
1915               {
1916                 unregister_filesystem(fsinst->fst);
1917                 fsinst->installed = 0;
1918               }
1919               fsinst++;
1920             }
1921     }
1922
1923     return error;
1924 }
1925
1926 static void __exit exit_yaffs_fs(void)
1927 {
1928
1929    struct file_system_to_install *fsinst;
1930
1931    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " removing. \n"));
1932
1933    remove_proc_entry("yaffs",&proc_root);
1934
1935     fsinst = fs_to_install;
1936
1937     while(fsinst->fst)
1938     {
1939       if(fsinst->installed)
1940       {
1941         unregister_filesystem(fsinst->fst);
1942         fsinst->installed = 0;
1943       }
1944       fsinst++;
1945     }
1946
1947 }
1948
1949 module_init(init_yaffs_fs)
1950 module_exit(exit_yaffs_fs)
1951
1952 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
1953 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002,2003,2004");
1954 MODULE_LICENSE("GPL");
1955
1956