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 1.11 2005-07-26 23:04:34 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/smp_lock.h>
  48 #include <linux/pagemap.h>
  49 #include <linux/mtd/mtd.h>
  50 #include <linux/interrupt.h>
  51 #include <linux/string.h>
  52
  53
  54 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  55
  56 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  57 #include <asm/statfs.h>
  58 #define UnlockPage(p) unlock_page(p)
  59 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  60 //#define kdevname(x) cdevname(to_kdev_t(x))
  61 #define kdevname(x) "(unavailable)"     // temporary fix
  62
  63 #else
  64
  65 #include <linux/locks.h>
  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_MTD_ENABLED
  92 #include <linux/mtd/mtd.h>
  93 #include "yaffs_mtdif.h"
  94 #include "yaffs_mtdif2.h"
  95 #endif //CONFIG_YAFFS_MTD_ENABLED
  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 //#if defined(CONFIG_KERNEL_2_5)
 158 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 159 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data);
 160 #else
 161 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent);
 162 #endif
 163
 164 static void yaffs_put_inode (struct inode *inode);
 165 static void yaffs_delete_inode(struct inode *);
 166 static void yaffs_clear_inode(struct inode *);
 167
 168 static int yaffs_readpage(struct file *file, struct page * page);
 169 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 170 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 171 #else
 172 static int yaffs_writepage(struct page *page);
 173 #endif
 174 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 175 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 176
 177 static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen);
 178 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 179
 180
 181
 182
 183 static struct address_space_operations yaffs_file_address_operations = {
 184         .readpage=              yaffs_readpage,
 185         .writepage=             yaffs_writepage,
 186         .prepare_write= yaffs_prepare_write,
 187         .commit_write=  yaffs_commit_write
 188 };
 189
 190
 191 static struct file_operations yaffs_file_operations = {
 192
 193         .read=          generic_file_read,
 194         .write=         generic_file_write,
 195
 196         .mmap=          generic_file_mmap,
 197         .flush=         yaffs_file_flush,
 198         .fsync=         yaffs_sync_object,
 199 };
 200
 201
 202 static struct inode_operations yaffs_file_inode_operations = {
 203         .setattr=       yaffs_setattr,
 204 };
 205
 206
 207 struct inode_operations yaffs_symlink_inode_operations =
 208 {
 209         .readlink=      yaffs_readlink,
 210         .follow_link=   yaffs_follow_link,
 211         .setattr=       yaffs_setattr
 212 };
 213
 214 static struct inode_operations yaffs_dir_inode_operations = {
 215         .create=                yaffs_create,
 216         .lookup=                yaffs_lookup,
 217         .link=          yaffs_link,
 218         .unlink=                yaffs_unlink,
 219         .symlink=       yaffs_symlink,
 220         .mkdir=         yaffs_mkdir,
 221         .rmdir=         yaffs_unlink,
 222         .mknod=         yaffs_mknod,
 223         .rename=                yaffs_rename,
 224         .setattr=       yaffs_setattr,
 225 };
 226
 227 static struct file_operations yaffs_dir_operations = {
 228         .read=          generic_read_dir,
 229         .readdir=       yaffs_readdir,
 230         .fsync=         yaffs_sync_object,
 231 };
 232
 233
 234 static struct super_operations yaffs_super_ops = {
 235         .statfs=                        yaffs_statfs,
 236         .read_inode=            yaffs_read_inode,
 237         .put_inode=             yaffs_put_inode,
 238         .put_super=             yaffs_put_super,
 239         .delete_inode=          yaffs_delete_inode,
 240         .clear_inode=           yaffs_clear_inode,
 241 };
 242
 243
 244
 245 static void yaffs_GrossLock(yaffs_Device *dev)
 246 {
 247         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
 248
 249         down(&dev->grossLock);
 250 }
 251
 252 static void yaffs_GrossUnlock(yaffs_Device *dev)
 253 {
 254         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
 255         up(&dev->grossLock);
 256
 257 }
 258
 259 static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
 260 {
 261         unsigned char *alias;
 262         int ret;
 263
 264         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 265
 266
 267         yaffs_GrossLock(dev);
 268
 269         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 270
 271         yaffs_GrossUnlock(dev);
 272
 273         if(!alias)
 274                 return -ENOMEM;
 275
 276         ret = vfs_readlink(dentry, buffer, buflen, alias);
 277         kfree(alias);
 278         return ret;
 279 }
 280
 281 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 282 {
 283         unsigned char *alias;
 284         int ret;
 285         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 286
 287
 288         yaffs_GrossLock(dev);
 289
 290         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 291
 292         yaffs_GrossUnlock(dev);
 293
 294         if(!alias)
 295                 return -ENOMEM;
 296
 297         ret = vfs_follow_link(nd,alias);
 298         kfree(alias);
 299         return ret;
 300 }
 301
 302
 303 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 304
 305 /*
 306  * Lookup is used to find objects in the fs
 307  */
 308 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 309 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 310
 311 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 312 #else
 313 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 314 #endif
 315 {
 316         yaffs_Object *obj;
 317         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 318
 319         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 320
 321
 322         yaffs_GrossLock(dev);
 323
 324
 325         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 326
 327         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 328
 329         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 330
 331
 332
 333         if(obj)
 334         {
 335                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 336
 337                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode,0,obj);
 338
 339                 if(inode)
 340                 {
 341                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
 342 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 343 #if 0
 344                         //dget(dentry); // try to solve directory bug
 345                         d_add(dentry,inode);
 346
 347                         yaffs_GrossUnlock(dev);
 348
 349                         // return dentry;
 350                         return NULL;
 351 #endif
 352                 }
 353
 354         }
 355         else
 356         {
 357                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
 358
 359         }
 360         yaffs_GrossUnlock(dev);
 361
 362 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 363         d_add(dentry,inode);
 364
 365         return NULL;
 366         //      return (ERR_PTR(-EIO));
 367
 368 }
 369
 370 // For now put inode is just for debugging
 371 // Put inode is called when the inode **structure** is put.
 372 static void yaffs_put_inode(struct inode *inode)
 373 {
 374         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 375
 376 }
 377
 378 // clear is called to tell the fs to release any per-inode data it holds
 379 static void yaffs_clear_inode(struct inode *inode)
 380 {
 381         yaffs_Object *obj;
 382         yaffs_Device *dev;
 383
 384         obj = yaffs_InodeToObject(inode);
 385
 386         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 387                 obj ? "object exists" : "null object"));
 388
 389         if(obj)
 390         {
 391                 dev = obj->myDev;
 392                 yaffs_GrossLock(dev);
 393
 394                 // Clear the association between the inode ant the yaffs_Object.
 395                 obj->myInode = NULL;
 396                 inode->u.generic_ip = NULL;
 397
 398                 // If the object freeing was deferred, then the real free happens now.
 399                 // This should fix the inode inconsistency problem.
 400
 401                 yaffs_HandleDeferedFree(obj);
 402
 403                 yaffs_GrossUnlock(dev);
 404         }
 405
 406
 407 }
 408
 409 // delete is called when the link count is zero and the inode
 410 // is put (ie. nobody wants to know about it anymore, time to
 411 // delete the file).
 412 // NB Must call clear_inode()
 413 static void yaffs_delete_inode(struct inode *inode)
 414 {
 415         yaffs_Object *obj = yaffs_InodeToObject(inode);
 416         yaffs_Device *dev;
 417
 418         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 419                 obj ? "object exists" : "null object"));
 420
 421         if(obj)
 422         {
 423                 dev = obj->myDev;
 424                 yaffs_GrossLock(dev);
 425                 yaffs_DeleteFile(obj);
 426                 yaffs_GrossUnlock(dev);
 427         }
 428         clear_inode(inode);
 429 }
 430
 431
 432 static int yaffs_file_flush(struct file* file)
 433 {
 434         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 435
 436         yaffs_Device *dev = obj->myDev;
 437
 438         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 439                                 obj->dirty ? "dirty" : "clean"));
 440
 441         yaffs_GrossLock(dev);
 442
 443     yaffs_FlushFile(obj,1);
 444
 445         yaffs_GrossUnlock(dev);
 446
 447     return 0;
 448 }
 449
 450
 451
 452 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 453 {
 454         // Lifted from jffs2
 455
 456         yaffs_Object *obj;
 457         unsigned char *pg_buf;
 458         int ret;
 459
 460         yaffs_Device *dev;
 461
 462         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 463                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 464
 465         obj  = yaffs_DentryToObject(f->f_dentry);
 466
 467         dev = obj->myDev;
 468
 469
 470 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 471         BUG_ON(!PageLocked(pg));
 472 #else
 473         if (!PageLocked(pg))
 474                 PAGE_BUG(pg);
 475 #endif
 476
 477         pg_buf = kmap(pg);
 478         /* FIXME: Can kmap fail? */
 479
 480         yaffs_GrossLock(dev);
 481
 482         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 483
 484         yaffs_GrossUnlock(dev);
 485
 486         if(ret >= 0) ret = 0;
 487
 488         if (ret) {
 489                 ClearPageUptodate(pg);
 490                 SetPageError(pg);
 491         } else {
 492                 SetPageUptodate(pg);
 493                 ClearPageError(pg);
 494         }
 495
 496         flush_dcache_page(pg);
 497         kunmap(pg);
 498
 499
 500         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
 501         return ret;
 502 }
 503
 504 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 505 {
 506         int ret = yaffs_readpage_nolock(f,pg);
 507         UnlockPage(pg);
 508         return ret;
 509 }
 510
 511 static int yaffs_readpage(struct file *f, struct page * pg)
 512 {
 513         return yaffs_readpage_unlock(f,pg);
 514 }
 515
 516 // writepage inspired by/stolen from smbfs
 517 //
 518
 519 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 520 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 521 #else
 522 static int yaffs_writepage(struct page *page)
 523 #endif
 524 {
 525         struct address_space *mapping = page->mapping;
 526         struct inode *inode;
 527         unsigned long end_index;
 528         char *buffer;
 529         yaffs_Object *obj;
 530         int nWritten = 0;
 531         unsigned nBytes;
 532
 533         if (!mapping)
 534                 BUG();
 535         inode = mapping->host;
 536         if (!inode)
 537                 BUG();
 538
 539         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 540
 541         /* easy case */
 542         if (page->index < end_index)
 543         {
 544                 nBytes = PAGE_CACHE_SIZE;
 545         }
 546         else
 547         {
 548                 nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
 549         }
 550         //  What's happening here?
 551         ///* OK, are we completely out? */
 552         //if (page->index >= end_index+1 || !offset)
 553         //      return -EIO;
 554
 555         get_page(page);
 556
 557
 558         buffer = kmap(page);
 559
 560         obj = yaffs_InodeToObject(inode);
 561         yaffs_GrossLock(obj->myDev);
 562
 563
 564         nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes,0);
 565
 566         yaffs_GrossUnlock(obj->myDev);
 567
 568         kunmap(page);
 569         SetPageUptodate(page);
 570         UnlockPage(page);
 571         put_page(page);
 572
 573         return (nWritten == nBytes) ? 0  : -ENOSPC;
 574 }
 575
 576
 577
 578 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 579 {
 580
 581         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
 582         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 583                 return  yaffs_readpage_nolock(f,pg);
 584
 585         return 0;
 586
 587 }
 588
 589 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 590 {
 591
 592         void *addr = page_address(pg) + offset;
 593         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 594         int nBytes = to - offset;
 595         int nWritten;
 596
 597         unsigned spos = pos;
 598         unsigned saddr = (unsigned)addr;
 599
 600         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 601
 602         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 603
 604         if(nWritten != nBytes)
 605         {
 606                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 607                 SetPageError(pg);
 608                 ClearPageUptodate(pg);
 609         }
 610         else
 611         {
 612                 SetPageUptodate(pg);
 613         }
 614
 615         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 616
 617         return nWritten;
 618
 619 }
 620
 621
 622
 623 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 624 {
 625         if (inode && obj)
 626         {
 627                 inode->i_ino = obj->objectId;
 628                 inode->i_mode = obj->yst_mode;
 629                 inode->i_uid = obj->yst_uid;
 630                 inode->i_gid = obj->yst_gid;
 631                 inode->i_blksize = inode->i_sb->s_blocksize;
 632 //#if defined(CONFIG_KERNEL_2_5)
 633 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 634
 635                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 636                 inode->i_atime.tv_sec = (time_t)(obj->yst_atime);
 637                 inode->i_atime.tv_nsec = 0;
 638                 inode->i_mtime.tv_sec = (time_t)obj->yst_mtime;
 639                 inode->i_mtime.tv_nsec =0;
 640                 inode->i_ctime.tv_sec = (time_t)obj->yst_ctime;
 641                 inode->i_ctime.tv_nsec = 0;
 642 #else
 643                 inode->i_rdev = obj->yst_rdev;
 644                 inode->i_atime = obj->yst_atime;
 645                 inode->i_mtime = obj->yst_mtime;
 646                 inode->i_ctime = obj->yst_ctime;
 647 #endif
 648                 inode->i_size = yaffs_GetObjectFileLength(obj);
 649                 inode->i_blocks = (inode->i_size + 511) >> 9;
 650
 651                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 652
 653                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 654                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 655
 656                 switch (obj->yst_mode & S_IFMT)
 657                 {
 658                         default: // fifo, device or socket
 659 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 660                                init_special_inode(inode, obj->yst_mode,old_decode_dev(obj->yst_rdev));
 661 #else
 662                                  init_special_inode(inode, obj->yst_mode,(dev_t)(obj->yst_rdev));
 663 #endif
 664                         break;
 665                         case S_IFREG:   // file
 666                                 inode->i_op = &yaffs_file_inode_operations;
 667                                 inode->i_fop = &yaffs_file_operations;
 668                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 669                                 break;
 670                         case S_IFDIR:   // directory
 671                                 inode->i_op = &yaffs_dir_inode_operations;
 672                                 inode->i_fop = &yaffs_dir_operations;
 673                                 break;
 674                         case S_IFLNK:   // symlink
 675                                 inode->i_op = &yaffs_symlink_inode_operations;
 676                                 break;
 677                 }
 678
 679
 680                 inode->u.generic_ip = obj;
 681                 obj->myInode = inode;
 682
 683         }
 684         else
 685         {
 686                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 687         }
 688
 689 }
 690
 691 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 692 {
 693         struct inode * inode;
 694
 695         if(!sb)
 696         {
 697           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL super_block!!\n"));
 698           return NULL;
 699
 700         }
 701
 702         if(!obj)
 703         {
 704           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL object!!\n"));
 705           return NULL;
 706
 707         }
 708
 709         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 710
 711         inode = iget(sb,obj->objectId);
 712
 713         // NB Side effect: iget calls back to yaffs_read_inode().
 714         // iget also increments the inode's i_count
 715
 716         return inode;
 717 }
 718
 719 #if 0
 720
 721 // No longer used because we use generic rw */
 722 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 723 {
 724         yaffs_Object *obj;
 725         int nRead,ipos;
 726         struct inode *inode;
 727         yaffs_Device *dev;
 728
 729         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n"));
 730
 731         obj  = yaffs_DentryToObject(f->f_dentry);
 732
 733         dev = obj->myDev;
 734
 735         yaffs_GrossLock(dev);
 736
 737         inode = f->f_dentry->d_inode;
 738
 739         if (*pos < inode->i_size)
 740         {
 741                         if (*pos + n > inode->i_size)
 742                         {
 743                                 n = inode->i_size - *pos;
 744                         }
 745         }
 746         else
 747         {
 748                 n = 0;
 749         }
 750
 751         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 752         if(nRead > 0)
 753         {
 754                 f->f_pos += nRead;
 755         }
 756
 757         yaffs_GrossUnlock(dev);
 758
 759         ipos = *pos;
 760
 761         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 762         return nRead;
 763
 764 }
 765
 766 #endif
 767
 768 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 769 {
 770         yaffs_Object *obj;
 771         int nWritten,ipos;
 772         struct inode *inode;
 773         yaffs_Device *dev;
 774
 775
 776         obj  = yaffs_DentryToObject(f->f_dentry);
 777
 778         dev = obj->myDev;
 779
 780         yaffs_GrossLock(dev);
 781
 782         inode = f->f_dentry->d_inode;
 783
 784         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 785         {
 786                 ipos = inode->i_size;
 787         }
 788         else
 789         {
 790                 ipos = *pos;
 791         }
 792
 793
 794         if(!obj)
 795         {
 796                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 797         }
 798         else
 799         {
 800                 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));
 801         }
 802
 803         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n,0);
 804
 805         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 806         if(nWritten > 0)
 807         {
 808                 ipos += nWritten;
 809                 *pos = ipos;
 810                 if(ipos > inode->i_size)
 811                 {
 812                         inode->i_size = ipos;
 813                         inode->i_blocks = (ipos + 511)>>9;
 814
 815                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 816                 }
 817
 818         }
 819         yaffs_GrossUnlock(dev);
 820
 821         return nWritten != n ? -ENOSPC : nWritten;
 822 }
 823
 824
 825
 826 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 827 {
 828         yaffs_Object *obj;
 829         yaffs_Device *dev;
 830         struct inode *inode = f->f_dentry->d_inode;
 831         unsigned long offset, curoffs;
 832         struct list_head *i;
 833         yaffs_Object *l;
 834
 835         char name[YAFFS_MAX_NAME_LENGTH +1];
 836
 837         obj =  yaffs_DentryToObject(f->f_dentry);
 838         dev = obj->myDev;
 839
 840         yaffs_GrossLock(dev);
 841
 842         offset = f->f_pos;
 843
 844         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 845
 846         if(offset == 0)
 847         {
 848         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 849                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 850                 {
 851                         goto out;
 852                 }
 853                 offset++;
 854                 f->f_pos++;
 855         }
 856         if(offset == 1)
 857         {
 858                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 859                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 860                 {
 861                         goto out;
 862                 }
 863                 offset++;
 864                 f->f_pos++;
 865         }
 866
 867         curoffs = 1;
 868
 869         list_for_each(i,&obj->variant.directoryVariant.children)
 870         {
 871                 curoffs++;
 872                 if(curoffs >= offset)
 873                 {
 874                         l = list_entry(i, yaffs_Object,siblings);
 875
 876                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 877                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 878
 879                         if(filldir(dirent,
 880                                            name,
 881                                            strlen(name),
 882                                            offset,
 883                                            yaffs_GetObjectInode(l),
 884                                            yaffs_GetObjectType(l))
 885                                            < 0)
 886                         {
 887                                 goto up_and_out;
 888                         }
 889
 890                         offset++;
 891                         f->f_pos++;
 892                 }
 893         }
 894
 895   up_and_out:
 896   out:
 897
 898     yaffs_GrossUnlock(dev);
 899
 900         return 0;
 901 }
 902
 903
 904 /*
 905  * File creation. Allocate an inode, and we're done..
 906  */
 907 //#if defined(CONFIG_KERNEL_2_5)
 908 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 909 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 910 #else
 911 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 912 #endif
 913 {
 914         struct inode *inode;
 915
 916         yaffs_Object *obj = NULL;
 917         yaffs_Device *dev;
 918
 919         yaffs_Object *parent = yaffs_InodeToObject(dir);
 920
 921         int error = -ENOSPC;
 922
 923         if(parent)
 924         {
 925                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 926                                          parent->objectId,parent->variantType));
 927         }
 928         else
 929         {
 930                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 931                 return -EPERM;
 932         }
 933
 934         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 935                                         dentry->d_name.name, mode,rdev));
 936
 937         dev = parent->myDev;
 938
 939         yaffs_GrossLock(dev);
 940
 941         switch (mode & S_IFMT)
 942         {
 943                 default:
 944                         // Special (socket, fifo, device...)
 945                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 946 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 947                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,old_encode_dev(rdev));
 948 #else
 949                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 950 #endif
 951                 break;
 952                 case S_IFREG:   // file
 953                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 954                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 955                         break;
 956                 case S_IFDIR:   // directory
 957                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 958                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 959                         break;
 960                 case S_IFLNK:   // symlink
 961                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 962                         obj = NULL; // Do we ever get here?
 963                         break;
 964         }
 965
 966         if(obj)
 967         {
 968                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 969                 d_instantiate(dentry, inode);
 970                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 971                 error = 0;
 972         }
 973         else
 974         {
 975                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 976                 error = -ENOMEM;
 977         }
 978
 979         yaffs_GrossUnlock(dev);
 980
 981         return error;
 982 }
 983
 984 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 985 {
 986         int retVal;
 987         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 988         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 989 #if 0
 990  // attempt to fix dir bug - didn't work
 991         if(!retVal)
 992         {
 993                 dget(dentry);
 994         }
 995 #endif
 996         return retVal;
 997 }
 998
 999 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
1000 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1001 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
1002 #else
1003 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1004 #endif
1005 {
1006         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
1007         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1008 }
1009
1010
1011 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
1012 {
1013         int retVal;
1014
1015         yaffs_Device *dev;
1016
1017
1018         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
1019
1020         dev = yaffs_InodeToObject(dir)->myDev;
1021
1022         yaffs_GrossLock(dev);
1023
1024
1025         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
1026
1027
1028         yaffs_GrossUnlock(dev);
1029
1030         if( retVal == YAFFS_OK)
1031         {
1032                 dentry->d_inode->i_nlink--;
1033                 mark_inode_dirty(dentry->d_inode);
1034                 return 0;
1035         }
1036         else
1037         {
1038                 return -ENOTEMPTY;
1039         }
1040 }
1041
1042
1043 /*
1044  * Create a link...
1045  */
1046 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
1047 {
1048         struct inode *inode = old_dentry->d_inode;
1049         yaffs_Object *obj = NULL;
1050         yaffs_Object *link=NULL;
1051         yaffs_Device *dev;
1052
1053         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
1054
1055         obj = yaffs_InodeToObject(inode);
1056         dev = obj->myDev;
1057
1058         yaffs_GrossLock(dev);
1059
1060         if (!S_ISDIR(inode->i_mode))    // Don't link directories
1061         {
1062                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
1063         }
1064
1065
1066         if(link)
1067         {
1068                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
1069                 d_instantiate(dentry, old_dentry->d_inode);
1070                 atomic_inc(&old_dentry->d_inode->i_count);
1071                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
1072                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
1073
1074         }
1075
1076         yaffs_GrossUnlock(dev);
1077
1078
1079         if(link)
1080         {
1081
1082                 return 0;
1083         }
1084
1085
1086         return -EPERM;
1087 }
1088
1089
1090 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
1091 {
1092         yaffs_Object *obj;
1093         yaffs_Device *dev;
1094
1095         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
1096
1097         dev = yaffs_InodeToObject(dir)->myDev;
1098         yaffs_GrossLock(dev);
1099         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1100                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
1101                                                          symname);
1102         yaffs_GrossUnlock(dev);
1103
1104         if(obj)
1105         {
1106
1107                 struct inode* inode;
1108
1109                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1110                 d_instantiate(dentry, inode);
1111                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
1112                 return 0;
1113         }
1114         else
1115         {
1116                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
1117
1118         }
1119
1120         return -ENOMEM;
1121 }
1122
1123 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
1124 {
1125
1126         yaffs_Object *obj;
1127         yaffs_Device *dev;
1128
1129         obj = yaffs_DentryToObject(dentry);
1130
1131         dev = obj->myDev;
1132
1133         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
1134         yaffs_GrossLock(dev);
1135         yaffs_FlushFile(obj,1);
1136         yaffs_GrossUnlock(dev);
1137         return 0;
1138 }
1139
1140 /*
1141  * The VFS layer already does all the dentry stuff for rename.
1142  *
1143  * NB: POSIX says you can rename an object over an old object of the same name
1144  */
1145 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1146 {
1147         yaffs_Device *dev;
1148         int retVal = YAFFS_FAIL;
1149         int removed = 0;
1150         yaffs_Object *target;
1151
1152         dev = yaffs_InodeToObject(old_dir)->myDev;
1153
1154         yaffs_GrossLock(dev);
1155
1156         // Check if the target is an existing directory that is not empty.
1157         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1158
1159         if(target &&
1160            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1161            !list_empty(&target->variant.directoryVariant.children))
1162         {
1163                 retVal = YAFFS_FAIL;
1164         }
1165         else
1166         {
1167
1168                 // Unlink the target if it exists
1169                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1170
1171
1172                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1173                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1174
1175         }
1176         yaffs_GrossUnlock(dev);
1177
1178         if(retVal == YAFFS_OK)
1179         {
1180                 if(removed == YAFFS_OK)
1181                 {
1182                         new_dentry->d_inode->i_nlink--;
1183                         mark_inode_dirty(new_dentry->d_inode);
1184                 }
1185
1186                 return 0;
1187         }
1188         else
1189         {
1190                 return -ENOTEMPTY;
1191         }
1192
1193
1194 }
1195
1196 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1197 {
1198         struct inode *inode = dentry->d_inode;
1199         int error;
1200         yaffs_Device *dev;
1201
1202         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1203
1204         if((error = inode_change_ok(inode,attr)) == 0)
1205         {
1206
1207                 dev = yaffs_InodeToObject(inode)->myDev;
1208                 yaffs_GrossLock(dev);
1209                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1210                 {
1211                         error = 0;
1212                 }
1213                 else
1214                 {
1215                         error = -EPERM;
1216                 }
1217                 yaffs_GrossUnlock(dev);
1218                 if (!error)
1219                         error = inode_setattr(inode,attr);
1220         }
1221         return error;
1222 }
1223
1224 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
1225 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1226 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1227 #else
1228 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1229 #endif
1230 {
1231
1232
1233         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1234         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1235
1236         yaffs_GrossLock(dev);
1237
1238
1239         buf->f_type = YAFFS_MAGIC;
1240         buf->f_bsize = sb->s_blocksize;
1241         buf->f_namelen = 255;
1242         if(sb->s_blocksize > dev->nBytesPerChunk)
1243         {
1244
1245                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock/
1246                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1247                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1248                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1249         }
1250         else
1251         {
1252
1253                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock *
1254                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1255                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev) *
1256                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1257         }
1258         buf->f_files = 0;
1259         buf->f_ffree = 0;
1260         buf->f_bavail =  buf->f_bfree;
1261
1262         yaffs_GrossUnlock(dev);
1263         return 0;
1264 }
1265
1266 static void yaffs_read_inode (struct inode *inode)
1267 {
1268         // NB This is called as a side effect of other functions and
1269         // thus gross locking should always be in place already.
1270
1271         yaffs_Object *obj ;
1272         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1273
1274         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1275
1276         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1277
1278         yaffs_FillInodeFromObject(inode,obj);
1279
1280 }
1281
1282 static LIST_HEAD(yaffs_dev_list);
1283
1284 static void yaffs_put_super(struct super_block *sb)
1285 {
1286         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1287
1288         yaffs_GrossLock(dev);
1289         if(dev->putSuperFunc)
1290         {
1291                  dev->putSuperFunc(sb);
1292         }
1293         yaffs_Deinitialise(dev);
1294         yaffs_GrossUnlock(dev);
1295
1296         /* we assume this is protected by lock_kernel() in mount/umount */
1297         list_del(&dev->devList);
1298
1299         kfree(dev);
1300 }
1301
1302
1303 #ifdef CONFIG_YAFFS_MTD_ENABLED
1304
1305 static void  yaffs_MTDPutSuper(struct super_block *sb)
1306 {
1307
1308         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1309
1310         if(mtd->sync)
1311         {
1312                 mtd->sync(mtd);
1313         }
1314
1315         put_mtd_device(mtd);
1316 }
1317
1318 #endif
1319
1320
1321 static struct super_block *yaffs_internal_read_super(int yaffsVersion,int useRam, struct super_block * sb, void * data, int silent)
1322 {
1323         int nBlocks;
1324         struct inode * inode = NULL;
1325         struct dentry * root;
1326         yaffs_Device *dev = 0;
1327         int err;
1328
1329         sb->s_magic = YAFFS_MAGIC;
1330         sb->s_op = &yaffs_super_ops;
1331
1332         if(!sb)
1333                 printk(KERN_INFO"yaffs: sb is NULL\n");
1334         else if(!sb->s_dev)
1335                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1336         else if(! kdevname(sb->s_dev))
1337                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1338         else
1339                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1340
1341
1342
1343 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1344         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1345         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1346 #else
1347         sb->s_blocksize = PAGE_CACHE_SIZE;
1348         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1349 #endif
1350         T(YAFFS_TRACE_OS,("yaffs_read_super: Using yaffs%d\n",yaffsVersion));
1351         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1352
1353 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1354         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1355 #endif
1356
1357
1358
1359         if(useRam)
1360         {
1361
1362 #ifdef CONFIG_YAFFS_RAM_ENABLED
1363                 // Set the yaffs_Device up for ram emulation
1364
1365
1366 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1367                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1368 #else
1369                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1370 #endif
1371
1372                 if(!dev)
1373                 {
1374                         // Deep shit could not allocate device structure
1375                         T(YAFFS_TRACE_OS,("yaffs_read_super: Failed trying to allocate yaffs_Device.\n"));
1376                         return NULL;
1377                 }
1378
1379                 memset(dev,0,sizeof(yaffs_Device));
1380                 dev->genericDevice = NULL; // Not used for RAM emulation.
1381                 dev->name = sb->s_type->name;
1382
1383                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1384                 dev->startBlock = 0;
1385                 dev->endBlock = nBlocks - 1;
1386                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1387                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1388                 dev->nReservedBlocks = 5;
1389
1390                 if(yaffsVersion == 2)
1391                 {
1392                         dev->writeChunkWithTagsToNAND  = nandemul2k_WriteChunkWithTagsToNAND;
1393                         dev->readChunkWithTagsFromNAND = nandemul2k_ReadChunkWithTagsFromNAND;
1394                         dev->markNANDBlockBad          = nandemul2k_MarkNANDBlockBad;
1395                         dev->queryNANDBlock            = nandemul2k_QueryNANDBlock;
1396                         dev->eraseBlockInNAND          = nandemul2k_EraseBlockInNAND;
1397                         dev->initialiseNAND            = nandemul2k_InitialiseNAND;
1398                         dev->isYaffs2 = 1;
1399                         dev->nChunksPerBlock = nandemul2k_GetChunksPerBlock();
1400                         dev->nBytesPerChunk =  nandemul2k_GetBytesPerChunk();;
1401                         nBlocks = nandemul2k_GetNumberOfBlocks();
1402                         dev->startBlock = 0;
1403                         dev->endBlock = nBlocks - 1;
1404                 }
1405                 else
1406                 {
1407                         dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1408                         dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1409                         dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1410                         dev->initialiseNAND = nandemul_InitialiseNAND;
1411                         dev->isYaffs2 = 0;
1412                 }
1413 #endif
1414
1415         }
1416         else
1417         {
1418 #ifdef CONFIG_YAFFS_MTD_ENABLED
1419                 struct mtd_info *mtd;
1420
1421                 T(YAFFS_TRACE_ALWAYS,("yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1422                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev)));
1423
1424                 // Check it's an mtd device.....
1425                 if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1426                 {
1427                         return NULL; // This isn't an mtd device
1428                 }
1429
1430                 // Get the device
1431                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1432                 if (!mtd)
1433                 {
1434                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev)));
1435                         return NULL;
1436                 }
1437
1438                 // Check it's NAND
1439                 if(mtd->type != MTD_NANDFLASH)
1440                 {
1441                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1442                         return NULL;
1443                 }
1444
1445                 T(YAFFS_TRACE_OS,(" erase %p\n",mtd->erase));
1446                 T(YAFFS_TRACE_OS,(" read %p\n",mtd->read));
1447                 T(YAFFS_TRACE_OS,(" write %p\n",mtd->write));
1448                 T(YAFFS_TRACE_OS,(" readoob %p\n",mtd->read_oob));
1449                 T(YAFFS_TRACE_OS,(" writeoob %p\n",mtd->write_oob));
1450                 T(YAFFS_TRACE_OS,(" block_isbad %p\n",mtd->block_isbad));
1451                 T(YAFFS_TRACE_OS,(" block_markbad %p\n",mtd->block_markbad));
1452                 T(YAFFS_TRACE_OS,(" oobblock %d\n",mtd->oobblock));
1453                 T(YAFFS_TRACE_OS,(" oobsize %d\n",mtd->oobsize));
1454                 T(YAFFS_TRACE_OS,(" erasesize %d\n",mtd->erasesize));
1455                 T(YAFFS_TRACE_OS,(" size %d\n",mtd->size));
1456
1457                 if(yaffsVersion == 2)
1458                 {
1459                         // Check for version 2 style functions
1460                         if(!mtd->erase ||
1461                            !mtd->block_isbad ||
1462                            !mtd->block_markbad ||
1463                            !mtd->read  ||
1464                            !mtd->write ||
1465 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1466                            !mtd->write_ecc ||
1467                            !mtd->read_ecc ||
1468 #endif
1469                            !mtd->read_oob ||
1470                            !mtd->write_oob )
1471                         {
1472                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1473                                 return NULL;
1474                         }
1475
1476                         if(mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1477                            mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE)
1478                         {
1479                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1480                                 return NULL;
1481                         }               }
1482                 else
1483                 {
1484                         // Check for V1 style functions
1485                         if(!mtd->erase ||
1486                            !mtd->read  ||
1487                            !mtd->write ||
1488 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1489                            !mtd->write_ecc ||
1490                            !mtd->read_ecc ||
1491 #endif
1492                            !mtd->read_oob ||
1493                            !mtd->write_oob )
1494                         {
1495                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1496                                 return NULL;
1497                         }
1498
1499                         if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1500                            mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1501                         {
1502                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1503                                 return NULL;
1504                         }
1505                 }
1506
1507
1508                         // OK, so if we got here, we have an MTD that's NAND and looks
1509                         // like it has the right capabilities
1510                         // Set the yaffs_Device up for mtd
1511
1512 //#if defined(CONFIG_KERNEL_2_5)
1513 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1514                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1515 #else
1516                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1517 #endif
1518                 if(!dev)
1519                 {
1520                         // Deep shit could not allocate device structure
1521                         T(YAFFS_TRACE_ALWAYS,("yaffs_read_super: Failed trying to allocate yaffs_Device. \n"));
1522                         return NULL;
1523                 }
1524
1525                 memset(dev,0,sizeof(yaffs_Device));
1526                 dev->genericDevice = mtd;
1527                 dev->name = mtd->name;
1528
1529                 // Set up the memory size parameters....
1530
1531                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1532                 dev->startBlock = 0;
1533                 dev->endBlock = nBlocks - 1;
1534                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1535                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1536                 dev->nReservedBlocks = 5;
1537                 dev->nShortOpCaches = 10; // Enable short op caching
1538
1539
1540                 // ... and the functions.
1541                 if(yaffsVersion == 2)
1542                 {
1543                         dev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND;
1544                         dev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND;
1545                         dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1546                         dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1547                         dev->spareBuffer = YMALLOC(mtd->oobsize);
1548                         dev->isYaffs2 = 1;
1549                         dev->nBytesPerChunk = mtd->oobblock;
1550                         dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1551                         nBlocks = mtd->size / mtd->erasesize;
1552                         dev->startBlock = 0;
1553                         dev->endBlock = nBlocks - 1;
1554                 }
1555                 else
1556                 {
1557                         dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1558                         dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1559                         dev->isYaffs2 = 0;
1560                 }
1561                 // ... and common functions
1562                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1563                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1564
1565                 dev->putSuperFunc = yaffs_MTDPutSuper;
1566
1567 #ifdef CONFIG_YAFFS_USE_NANDECC
1568                 dev->useNANDECC = 1;
1569 #endif
1570 #endif
1571         }
1572
1573         /* we assume this is protected by lock_kernel() in mount/umount */
1574         list_add_tail(&dev->devList, &yaffs_dev_list);
1575
1576         init_MUTEX(&dev->grossLock);
1577
1578
1579         yaffs_GrossLock(dev);
1580
1581         err = yaffs_GutsInitialise(dev);
1582
1583         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised %s\n", (err == YAFFS_OK) ? "OK" : "FAILED"));
1584
1585         // Create root inode
1586         if(err == YAFFS_OK)
1587           inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(dev));
1588
1589         yaffs_GrossUnlock(dev);
1590
1591         if (!inode)
1592                 return NULL;
1593
1594 // added NCB
1595         inode->i_op = & yaffs_dir_inode_operations;
1596         inode->i_fop = & yaffs_dir_operations;
1597
1598         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1599
1600
1601         root = d_alloc_root(inode);
1602
1603         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1604
1605         if (!root) {
1606                 iput(inode);
1607                 return NULL;
1608         }
1609         sb->s_root = root;
1610
1611         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1612         return sb;
1613 }
1614
1615
1616 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1617 {
1618          return yaffs_internal_read_super(1,1,sb,data,silent) ? 0 : -1;
1619 }
1620 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1621 {
1622          return yaffs_internal_read_super(1,0,sb,data,silent) ? 0 : -1;
1623 }
1624
1625 static int yaffs2_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1626 {
1627          return yaffs_internal_read_super(2,1,sb,data,silent) ? 0 : -1;
1628 }
1629 static int yaffs2_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1630 {
1631          return yaffs_internal_read_super(2,0,sb,data,silent) ? 0 : -1;
1632 }
1633
1634
1635
1636 #ifdef CONFIG_YAFFS_MTD_ENABLED
1637 //#if defined(CONFIG_KERNEL_2_5)
1638 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1639 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1640 {
1641
1642     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1643 }
1644
1645 /* changes NCB 2.5.70 */
1646 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1647 static struct file_system_type yaffs_fs_type = {
1648         .owner          = THIS_MODULE,
1649         .name           = "yaffs",
1650         .get_sb         = yaffs_read_super,
1651         .kill_sb        = kill_block_super,
1652 //      .kill_sb        = kill_litter_super,
1653         .fs_flags       = FS_REQUIRES_DEV,
1654 };
1655 #else
1656 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1657 {
1658         return yaffs_internal_read_super(1,0,sb,data,silent);
1659 }
1660
1661 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1662 #endif
1663
1664 #endif // CONFIG_YAFFS_MTD_ENABLED
1665
1666 #ifdef CONFIG_YAFFS2_MTD_ENABLED
1667
1668 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1669 static struct super_block *yaffs2_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1670 {
1671
1672     return get_sb_bdev(fs, flags, dev_name, data, yaffs2_internal_read_super_mtd);
1673 }
1674
1675 /* changes NCB 2.5.70 */
1676 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1677 static struct file_system_type yaffs2_fs_type = {
1678         .owner          = THIS_MODULE,
1679         .name           = "yaffs2",
1680         .get_sb         = yaffs2_read_super,
1681         .kill_sb        = kill_block_super,
1682 //      .kill_sb        = kill_litter_super,
1683         .fs_flags       = FS_REQUIRES_DEV,
1684 };
1685 #else
1686 static struct super_block *yaffs2_read_super(struct super_block * sb, void * data, int silent)
1687 {
1688         return yaffs_internal_read_super(2,0,sb,data,silent);
1689 }
1690
1691 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, FS_REQUIRES_DEV);
1692 #endif
1693
1694 #endif // CONFIG_YAFFS2_MTD_ENABLED
1695
1696
1697 #ifdef CONFIG_YAFFS_RAM_ENABLED
1698
1699 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1700 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1701 {
1702
1703     return get_sb_nodev(fs, flags, data, yaffs_internal_read_super_ram);
1704 }
1705
1706
1707 static struct file_system_type yaffs_ram_fs_type = {
1708         .owner          = THIS_MODULE,
1709         .name           = "yaffsram",
1710         .get_sb         = yaffs_ram_read_super,
1711         .kill_sb        = kill_litter_super,
1712         .fs_flags       = 0 ,
1713 };
1714 #else
1715 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1716 {
1717         return yaffs_internal_read_super(1,1,sb,data,silent);
1718 }
1719
1720 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1721 #endif
1722
1723 #endif // CONFIG_YAFFS_RAM_ENABLED
1724
1725 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1726
1727 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1728 static struct super_block *yaffs2_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1729 {
1730
1731     return get_sb_nodev(fs, flags, data, yaffs2_internal_read_super_ram);
1732 }
1733
1734
1735 static struct file_system_type yaffs2_ram_fs_type = {
1736         .owner          = THIS_MODULE,
1737         .name           = "yaffs2ram",
1738         .get_sb         = yaffs2_ram_read_super,
1739         .kill_sb        = kill_litter_super,
1740         .fs_flags       = 0 ,
1741 };
1742 #else
1743 static struct super_block *yaffs2_ram_read_super(struct super_block * sb, void * data, int silent)
1744 {
1745         return yaffs_internal_read_super(2,1,sb,data,silent);
1746 }
1747
1748 static DECLARE_FSTYPE(yaffs2_ram_fs_type, "yaffs2ram", yaffs2_ram_read_super, FS_SINGLE);
1749 #endif
1750
1751 #endif // CONFIG_YAFFS2_RAM_ENABLED
1752
1753
1754
1755 static struct proc_dir_entry *my_proc_entry;
1756 static struct proc_dir_entry *my_proc_ram_write_entry;
1757
1758 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev)
1759 {
1760         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1761         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1762         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1763         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1764         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1765         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1766         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1767         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1768         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1769         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1770         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1771         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1772         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1773         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1774         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1775         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1776         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1777         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1778         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1779         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1780         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1781         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1782         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1783         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1784         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1785         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1786         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1787         buf +=sprintf(buf,"isYaffs2........... %d\n",dev->isYaffs2);
1788
1789         return buf;
1790 }
1791
1792 static int  yaffs_proc_read(
1793         char *page,
1794         char **start,
1795         off_t offset,
1796         int count,
1797         int *eof,
1798         void *data
1799         )
1800 {
1801         struct list_head *item;
1802         char *buf = page;
1803         int step = offset;
1804         int n = 0;
1805
1806         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
1807          * We use 'offset' (*ppos) to indicate where we are in devList.
1808          * This also assumes the user has posted a read buffer large
1809          * enough to hold the complete output; but that's life in /proc.
1810          */
1811
1812         *(int *)start = 1;
1813
1814         /* Print header first */
1815         if (step == 0) {
1816                 buf += sprintf(buf, "YAFFS built:" __DATE__ " "__TIME__
1817                 "\n%s\n%s\n", yaffs_fs_c_version, yaffs_guts_c_version);
1818         }
1819
1820         /* hold lock_kernel while traversing yaffs_dev_list */
1821         lock_kernel();
1822
1823         /* Locate and print the Nth entry.  Order N-squared but N is small. */
1824         list_for_each(item, &yaffs_dev_list) {
1825                 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
1826                 if (n < step) {
1827                         n++;
1828                         continue;
1829                 }
1830                 buf += sprintf(buf,"\nDevice %d \"%s\"\n", n, dev->name);
1831                 buf = yaffs_dump_dev(buf, dev);
1832                 break;
1833         }
1834         unlock_kernel();
1835
1836         return buf-page < count ? buf-page : count;
1837 }
1838
1839 static int  yaffs_proc_ram_write(
1840         char *page,
1841         char **start,
1842         off_t offset,
1843         int count,
1844         int *eof,
1845         void *data
1846         )
1847 {
1848
1849         printk(KERN_DEBUG "yaffs write size %d\n",count);
1850         return count;
1851 }
1852
1853
1854
1855 // Stuff to handle installation of file systems
1856 struct file_system_to_install
1857 {
1858    struct file_system_type *fst;
1859    int installed;
1860 };
1861
1862 static struct file_system_to_install fs_to_install[] =
1863 {
1864 #ifdef CONFIG_YAFFS_RAM_ENABLED
1865      { &yaffs_ram_fs_type, 0},
1866 #endif
1867 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1868      { &yaffs2_ram_fs_type,0},
1869 #endif
1870 #ifdef CONFIG_YAFFS_MTD_ENABLED
1871      { &yaffs_fs_type,0},
1872 #endif
1873 #ifdef CONFIG_YAFFS2_MTD_ENABLED
1874      { &yaffs2_fs_type,0},
1875 #endif
1876      { NULL,0}
1877 };
1878
1879 static int __init init_yaffs_fs(void)
1880 {
1881         int error = 0;
1882         struct file_system_to_install *fsinst;
1883
1884    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
1885
1886
1887
1888     /* Install the proc_fs entry */
1889     my_proc_entry = create_proc_read_entry("yaffs",
1890                                            S_IRUGO | S_IFREG,
1891                                            &proc_root,
1892                                            yaffs_proc_read,
1893                                            NULL);
1894     if(!my_proc_entry)
1895     {
1896        return -ENOMEM;
1897     }
1898
1899
1900
1901     // Now add the file system entries
1902
1903     fsinst = fs_to_install;
1904
1905     while(fsinst->fst && !error)
1906     {
1907       error = register_filesystem(fsinst->fst);
1908       if(!error)
1909       {
1910           fsinst->installed = 1;
1911       }
1912       fsinst++;
1913     }
1914
1915     // Any errors? uninstall
1916     if(error)
1917     {
1918             fsinst = fs_to_install;
1919
1920             while(fsinst->fst)
1921             {
1922               if(fsinst->installed)
1923               {
1924                 unregister_filesystem(fsinst->fst);
1925                 fsinst->installed = 0;
1926               }
1927               fsinst++;
1928             }
1929     }
1930
1931     return error;
1932 }
1933
1934 static void __exit exit_yaffs_fs(void)
1935 {
1936
1937    struct file_system_to_install *fsinst;
1938
1939    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " removing. \n"));
1940
1941    remove_proc_entry("yaffs",&proc_root);
1942
1943     fsinst = fs_to_install;
1944
1945     while(fsinst->fst)
1946     {
1947       if(fsinst->installed)
1948       {
1949         unregister_filesystem(fsinst->fst);
1950         fsinst->installed = 0;
1951       }
1952       fsinst++;
1953     }
1954
1955 }
1956
1957 module_init(init_yaffs_fs)
1958 module_exit(exit_yaffs_fs)
1959
1960 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
1961 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002,2003,2004");
1962 MODULE_LICENSE("GPL");
1963
1964