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 1.13 2005-07-29 20:13:23 luc 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 static void yaffs_put_inode (struct inode *inode);
 158 static void yaffs_delete_inode(struct inode *);
 159 static void yaffs_clear_inode(struct inode *);
 160
 161 static int yaffs_readpage(struct file *file, struct page * page);
 162 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 163 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 164 #else
 165 static int yaffs_writepage(struct page *page);
 166 #endif
 167 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 168 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 169
 170 static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen);
 171 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 172
 173
 174
 175 static struct address_space_operations yaffs_file_address_operations = {
 176         .readpage       = yaffs_readpage,
 177         .writepage      = yaffs_writepage,
 178         .prepare_write  = yaffs_prepare_write,
 179         .commit_write   = yaffs_commit_write,
 180 };
 181
 182 static struct file_operations yaffs_file_operations = {
 183         .read           = generic_file_read,
 184         .write          = generic_file_write,
 185         .mmap           = generic_file_mmap,
 186         .flush          = yaffs_file_flush,
 187         .fsync          = yaffs_sync_object,
 188 };
 189
 190 static struct inode_operations yaffs_file_inode_operations = {
 191         .setattr        = yaffs_setattr,
 192 };
 193
 194 struct inode_operations yaffs_symlink_inode_operations = {
 195         .readlink       = yaffs_readlink,
 196         .follow_link    = yaffs_follow_link,
 197         .setattr        = yaffs_setattr,
 198 };
 199
 200 static struct inode_operations yaffs_dir_inode_operations = {
 201         .create         = yaffs_create,
 202         .lookup         = yaffs_lookup,
 203         .link           = yaffs_link,
 204         .unlink         = yaffs_unlink,
 205         .symlink        = yaffs_symlink,
 206         .mkdir          = yaffs_mkdir,
 207         .rmdir          = yaffs_unlink,
 208         .mknod          = yaffs_mknod,
 209         .rename         = yaffs_rename,
 210         .setattr        = yaffs_setattr,
 211 };
 212
 213 static struct file_operations yaffs_dir_operations = {
 214         .read           = generic_read_dir,
 215         .readdir        = yaffs_readdir,
 216         .fsync          = yaffs_sync_object,
 217 };
 218
 219 static struct super_operations yaffs_super_ops = {
 220         .statfs         = yaffs_statfs,
 221         .read_inode     = yaffs_read_inode,
 222         .put_inode      = yaffs_put_inode,
 223         .put_super      = yaffs_put_super,
 224         .delete_inode   = yaffs_delete_inode,
 225         .clear_inode    = yaffs_clear_inode,
 226 };
 227
 228
 229
 230 static void yaffs_GrossLock(yaffs_Device *dev)
 231 {
 232         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
 233
 234         down(&dev->grossLock);
 235 }
 236
 237 static void yaffs_GrossUnlock(yaffs_Device *dev)
 238 {
 239         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
 240         up(&dev->grossLock);
 241
 242 }
 243
 244 static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
 245 {
 246         unsigned char *alias;
 247         int ret;
 248
 249         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 250
 251
 252         yaffs_GrossLock(dev);
 253
 254         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 255
 256         yaffs_GrossUnlock(dev);
 257
 258         if(!alias)
 259                 return -ENOMEM;
 260
 261         ret = vfs_readlink(dentry, buffer, buflen, alias);
 262         kfree(alias);
 263         return ret;
 264 }
 265
 266 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 267 {
 268         unsigned char *alias;
 269         int ret;
 270         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 271
 272
 273         yaffs_GrossLock(dev);
 274
 275         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 276
 277         yaffs_GrossUnlock(dev);
 278
 279         if(!alias)
 280                 return -ENOMEM;
 281
 282         ret = vfs_follow_link(nd,alias);
 283         kfree(alias);
 284         return ret;
 285 }
 286
 287
 288 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 289
 290 /*
 291  * Lookup is used to find objects in the fs
 292  */
 293 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 294 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 295
 296 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 297 #else
 298 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 299 #endif
 300 {
 301         yaffs_Object *obj;
 302         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 303
 304         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 305
 306
 307         yaffs_GrossLock(dev);
 308
 309
 310         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 311
 312         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 313
 314         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 315
 316
 317
 318         if(obj)
 319         {
 320                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 321
 322                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode,0,obj);
 323
 324                 if(inode)
 325                 {
 326                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
 327 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 328 #if 0
 329                         //dget(dentry); // try to solve directory bug
 330                         d_add(dentry,inode);
 331
 332                         yaffs_GrossUnlock(dev);
 333
 334                         // return dentry;
 335                         return NULL;
 336 #endif
 337                 }
 338
 339         }
 340         else
 341         {
 342                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
 343
 344         }
 345         yaffs_GrossUnlock(dev);
 346
 347 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 348         d_add(dentry,inode);
 349
 350         return NULL;
 351         //      return (ERR_PTR(-EIO));
 352
 353 }
 354
 355 // For now put inode is just for debugging
 356 // Put inode is called when the inode **structure** is put.
 357 static void yaffs_put_inode(struct inode *inode)
 358 {
 359         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 360
 361 }
 362
 363 // clear is called to tell the fs to release any per-inode data it holds
 364 static void yaffs_clear_inode(struct inode *inode)
 365 {
 366         yaffs_Object *obj;
 367         yaffs_Device *dev;
 368
 369         obj = yaffs_InodeToObject(inode);
 370
 371         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 372                 obj ? "object exists" : "null object"));
 373
 374         if(obj)
 375         {
 376                 dev = obj->myDev;
 377                 yaffs_GrossLock(dev);
 378
 379                 // Clear the association between the inode ant the yaffs_Object.
 380                 obj->myInode = NULL;
 381                 inode->u.generic_ip = NULL;
 382
 383                 // If the object freeing was deferred, then the real free happens now.
 384                 // This should fix the inode inconsistency problem.
 385
 386                 yaffs_HandleDeferedFree(obj);
 387
 388                 yaffs_GrossUnlock(dev);
 389         }
 390
 391
 392 }
 393
 394 // delete is called when the link count is zero and the inode
 395 // is put (ie. nobody wants to know about it anymore, time to
 396 // delete the file).
 397 // NB Must call clear_inode()
 398 static void yaffs_delete_inode(struct inode *inode)
 399 {
 400         yaffs_Object *obj = yaffs_InodeToObject(inode);
 401         yaffs_Device *dev;
 402
 403         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 404                 obj ? "object exists" : "null object"));
 405
 406         if(obj)
 407         {
 408                 dev = obj->myDev;
 409                 yaffs_GrossLock(dev);
 410                 yaffs_DeleteFile(obj);
 411                 yaffs_GrossUnlock(dev);
 412         }
 413         clear_inode(inode);
 414 }
 415
 416
 417 static int yaffs_file_flush(struct file* file)
 418 {
 419         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 420
 421         yaffs_Device *dev = obj->myDev;
 422
 423         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 424                                 obj->dirty ? "dirty" : "clean"));
 425
 426         yaffs_GrossLock(dev);
 427
 428     yaffs_FlushFile(obj,1);
 429
 430         yaffs_GrossUnlock(dev);
 431
 432     return 0;
 433 }
 434
 435
 436
 437 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 438 {
 439         // Lifted from jffs2
 440
 441         yaffs_Object *obj;
 442         unsigned char *pg_buf;
 443         int ret;
 444
 445         yaffs_Device *dev;
 446
 447         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 448                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 449
 450         obj  = yaffs_DentryToObject(f->f_dentry);
 451
 452         dev = obj->myDev;
 453
 454
 455 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 456         BUG_ON(!PageLocked(pg));
 457 #else
 458         if (!PageLocked(pg))
 459                 PAGE_BUG(pg);
 460 #endif
 461
 462         pg_buf = kmap(pg);
 463         /* FIXME: Can kmap fail? */
 464
 465         yaffs_GrossLock(dev);
 466
 467         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 468
 469         yaffs_GrossUnlock(dev);
 470
 471         if(ret >= 0) ret = 0;
 472
 473         if (ret) {
 474                 ClearPageUptodate(pg);
 475                 SetPageError(pg);
 476         } else {
 477                 SetPageUptodate(pg);
 478                 ClearPageError(pg);
 479         }
 480
 481         flush_dcache_page(pg);
 482         kunmap(pg);
 483
 484
 485         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
 486         return ret;
 487 }
 488
 489 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 490 {
 491         int ret = yaffs_readpage_nolock(f,pg);
 492         UnlockPage(pg);
 493         return ret;
 494 }
 495
 496 static int yaffs_readpage(struct file *f, struct page * pg)
 497 {
 498         return yaffs_readpage_unlock(f,pg);
 499 }
 500
 501 // writepage inspired by/stolen from smbfs
 502 //
 503
 504 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 505 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 506 #else
 507 static int yaffs_writepage(struct page *page)
 508 #endif
 509 {
 510         struct address_space *mapping = page->mapping;
 511         struct inode *inode;
 512         unsigned long end_index;
 513         char *buffer;
 514         yaffs_Object *obj;
 515         int nWritten = 0;
 516         unsigned nBytes;
 517
 518         if (!mapping)
 519                 BUG();
 520         inode = mapping->host;
 521         if (!inode)
 522                 BUG();
 523
 524         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 525
 526         /* easy case */
 527         if (page->index < end_index)
 528         {
 529                 nBytes = PAGE_CACHE_SIZE;
 530         }
 531         else
 532         {
 533                 nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
 534         }
 535         //  What's happening here?
 536         ///* OK, are we completely out? */
 537         //if (page->index >= end_index+1 || !offset)
 538         //      return -EIO;
 539
 540         get_page(page);
 541
 542
 543         buffer = kmap(page);
 544
 545         obj = yaffs_InodeToObject(inode);
 546         yaffs_GrossLock(obj->myDev);
 547
 548
 549         nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes,0);
 550
 551         yaffs_GrossUnlock(obj->myDev);
 552
 553         kunmap(page);
 554         SetPageUptodate(page);
 555         UnlockPage(page);
 556         put_page(page);
 557
 558         return (nWritten == nBytes) ? 0  : -ENOSPC;
 559 }
 560
 561
 562
 563 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 564 {
 565
 566         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
 567         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 568                 return  yaffs_readpage_nolock(f,pg);
 569
 570         return 0;
 571
 572 }
 573
 574 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 575 {
 576
 577         void *addr = page_address(pg) + offset;
 578         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 579         int nBytes = to - offset;
 580         int nWritten;
 581
 582         unsigned spos = pos;
 583         unsigned saddr = (unsigned)addr;
 584
 585         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 586
 587         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 588
 589         if(nWritten != nBytes)
 590         {
 591                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 592                 SetPageError(pg);
 593                 ClearPageUptodate(pg);
 594         }
 595         else
 596         {
 597                 SetPageUptodate(pg);
 598         }
 599
 600         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 601
 602         return nWritten;
 603
 604 }
 605
 606
 607
 608 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 609 {
 610         if (inode && obj)
 611         {
 612                 inode->i_ino = obj->objectId;
 613                 inode->i_mode = obj->yst_mode;
 614                 inode->i_uid = obj->yst_uid;
 615                 inode->i_gid = obj->yst_gid;
 616                 inode->i_blksize = inode->i_sb->s_blocksize;
 617 //#if defined(CONFIG_KERNEL_2_5)
 618 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 619
 620                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 621                 inode->i_atime.tv_sec = (time_t)(obj->yst_atime);
 622                 inode->i_atime.tv_nsec = 0;
 623                 inode->i_mtime.tv_sec = (time_t)obj->yst_mtime;
 624                 inode->i_mtime.tv_nsec =0;
 625                 inode->i_ctime.tv_sec = (time_t)obj->yst_ctime;
 626                 inode->i_ctime.tv_nsec = 0;
 627 #else
 628                 inode->i_rdev = obj->yst_rdev;
 629                 inode->i_atime = obj->yst_atime;
 630                 inode->i_mtime = obj->yst_mtime;
 631                 inode->i_ctime = obj->yst_ctime;
 632 #endif
 633                 inode->i_size = yaffs_GetObjectFileLength(obj);
 634                 inode->i_blocks = (inode->i_size + 511) >> 9;
 635
 636                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 637
 638                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 639                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 640
 641                 switch (obj->yst_mode & S_IFMT)
 642                 {
 643                         default: // fifo, device or socket
 644 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 645                                init_special_inode(inode, obj->yst_mode,old_decode_dev(obj->yst_rdev));
 646 #else
 647                                  init_special_inode(inode, obj->yst_mode,(dev_t)(obj->yst_rdev));
 648 #endif
 649                         break;
 650                         case S_IFREG:   // file
 651                                 inode->i_op = &yaffs_file_inode_operations;
 652                                 inode->i_fop = &yaffs_file_operations;
 653                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 654                                 break;
 655                         case S_IFDIR:   // directory
 656                                 inode->i_op = &yaffs_dir_inode_operations;
 657                                 inode->i_fop = &yaffs_dir_operations;
 658                                 break;
 659                         case S_IFLNK:   // symlink
 660                                 inode->i_op = &yaffs_symlink_inode_operations;
 661                                 break;
 662                 }
 663
 664
 665                 inode->u.generic_ip = obj;
 666                 obj->myInode = inode;
 667
 668         }
 669         else
 670         {
 671                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 672         }
 673
 674 }
 675
 676 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 677 {
 678         struct inode * inode;
 679
 680         if(!sb)
 681         {
 682           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL super_block!!\n"));
 683           return NULL;
 684
 685         }
 686
 687         if(!obj)
 688         {
 689           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL object!!\n"));
 690           return NULL;
 691
 692         }
 693
 694         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 695
 696         inode = iget(sb,obj->objectId);
 697
 698         // NB Side effect: iget calls back to yaffs_read_inode().
 699         // iget also increments the inode's i_count
 700
 701         return inode;
 702 }
 703
 704 #if 0
 705
 706 // No longer used because we use generic rw */
 707 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 708 {
 709         yaffs_Object *obj;
 710         int nRead,ipos;
 711         struct inode *inode;
 712         yaffs_Device *dev;
 713
 714         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n"));
 715
 716         obj  = yaffs_DentryToObject(f->f_dentry);
 717
 718         dev = obj->myDev;
 719
 720         yaffs_GrossLock(dev);
 721
 722         inode = f->f_dentry->d_inode;
 723
 724         if (*pos < inode->i_size)
 725         {
 726                         if (*pos + n > inode->i_size)
 727                         {
 728                                 n = inode->i_size - *pos;
 729                         }
 730         }
 731         else
 732         {
 733                 n = 0;
 734         }
 735
 736         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 737         if(nRead > 0)
 738         {
 739                 f->f_pos += nRead;
 740         }
 741
 742         yaffs_GrossUnlock(dev);
 743
 744         ipos = *pos;
 745
 746         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 747         return nRead;
 748
 749 }
 750
 751 #endif
 752
 753 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 754 {
 755         yaffs_Object *obj;
 756         int nWritten,ipos;
 757         struct inode *inode;
 758         yaffs_Device *dev;
 759
 760
 761         obj  = yaffs_DentryToObject(f->f_dentry);
 762
 763         dev = obj->myDev;
 764
 765         yaffs_GrossLock(dev);
 766
 767         inode = f->f_dentry->d_inode;
 768
 769         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 770         {
 771                 ipos = inode->i_size;
 772         }
 773         else
 774         {
 775                 ipos = *pos;
 776         }
 777
 778
 779         if(!obj)
 780         {
 781                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 782         }
 783         else
 784         {
 785                 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));
 786         }
 787
 788         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n,0);
 789
 790         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 791         if(nWritten > 0)
 792         {
 793                 ipos += nWritten;
 794                 *pos = ipos;
 795                 if(ipos > inode->i_size)
 796                 {
 797                         inode->i_size = ipos;
 798                         inode->i_blocks = (ipos + 511)>>9;
 799
 800                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 801                 }
 802
 803         }
 804         yaffs_GrossUnlock(dev);
 805
 806         return nWritten != n ? -ENOSPC : nWritten;
 807 }
 808
 809
 810
 811 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 812 {
 813         yaffs_Object *obj;
 814         yaffs_Device *dev;
 815         struct inode *inode = f->f_dentry->d_inode;
 816         unsigned long offset, curoffs;
 817         struct list_head *i;
 818         yaffs_Object *l;
 819
 820         char name[YAFFS_MAX_NAME_LENGTH +1];
 821
 822         obj =  yaffs_DentryToObject(f->f_dentry);
 823         dev = obj->myDev;
 824
 825         yaffs_GrossLock(dev);
 826
 827         offset = f->f_pos;
 828
 829         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 830
 831         if(offset == 0)
 832         {
 833         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 834                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 835                 {
 836                         goto out;
 837                 }
 838                 offset++;
 839                 f->f_pos++;
 840         }
 841         if(offset == 1)
 842         {
 843                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 844                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 845                 {
 846                         goto out;
 847                 }
 848                 offset++;
 849                 f->f_pos++;
 850         }
 851
 852         curoffs = 1;
 853
 854         list_for_each(i,&obj->variant.directoryVariant.children)
 855         {
 856                 curoffs++;
 857                 if(curoffs >= offset)
 858                 {
 859                         l = list_entry(i, yaffs_Object,siblings);
 860
 861                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 862                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 863
 864                         if(filldir(dirent,
 865                                            name,
 866                                            strlen(name),
 867                                            offset,
 868                                            yaffs_GetObjectInode(l),
 869                                            yaffs_GetObjectType(l))
 870                                            < 0)
 871                         {
 872                                 goto up_and_out;
 873                         }
 874
 875                         offset++;
 876                         f->f_pos++;
 877                 }
 878         }
 879
 880   up_and_out:
 881   out:
 882
 883     yaffs_GrossUnlock(dev);
 884
 885         return 0;
 886 }
 887
 888
 889 /*
 890  * File creation. Allocate an inode, and we're done..
 891  */
 892 //#if defined(CONFIG_KERNEL_2_5)
 893 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 894 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 895 #else
 896 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 897 #endif
 898 {
 899         struct inode *inode;
 900
 901         yaffs_Object *obj = NULL;
 902         yaffs_Device *dev;
 903
 904         yaffs_Object *parent = yaffs_InodeToObject(dir);
 905
 906         int error = -ENOSPC;
 907
 908         if(parent)
 909         {
 910                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 911                                          parent->objectId,parent->variantType));
 912         }
 913         else
 914         {
 915                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 916                 return -EPERM;
 917         }
 918
 919         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 920                                         dentry->d_name.name, mode,rdev));
 921
 922         dev = parent->myDev;
 923
 924         yaffs_GrossLock(dev);
 925
 926         switch (mode & S_IFMT)
 927         {
 928                 default:
 929                         // Special (socket, fifo, device...)
 930                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 931 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 932                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,old_encode_dev(rdev));
 933 #else
 934                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 935 #endif
 936                 break;
 937                 case S_IFREG:   // file
 938                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 939                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 940                         break;
 941                 case S_IFDIR:   // directory
 942                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 943                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 944                         break;
 945                 case S_IFLNK:   // symlink
 946                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 947                         obj = NULL; // Do we ever get here?
 948                         break;
 949         }
 950
 951         if(obj)
 952         {
 953                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 954                 d_instantiate(dentry, inode);
 955                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 956                 error = 0;
 957         }
 958         else
 959         {
 960                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 961                 error = -ENOMEM;
 962         }
 963
 964         yaffs_GrossUnlock(dev);
 965
 966         return error;
 967 }
 968
 969 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 970 {
 971         int retVal;
 972         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 973         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 974 #if 0
 975  // attempt to fix dir bug - didn't work
 976         if(!retVal)
 977         {
 978                 dget(dentry);
 979         }
 980 #endif
 981         return retVal;
 982 }
 983
 984 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 985 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 986 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
 987 #else
 988 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 989 #endif
 990 {
 991         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
 992         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 993 }
 994
 995
 996 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 997 {
 998         int retVal;
 999
1000         yaffs_Device *dev;
1001
1002
1003         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
1004
1005         dev = yaffs_InodeToObject(dir)->myDev;
1006
1007         yaffs_GrossLock(dev);
1008
1009
1010         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
1011
1012
1013         yaffs_GrossUnlock(dev);
1014
1015         if( retVal == YAFFS_OK)
1016         {
1017                 dentry->d_inode->i_nlink--;
1018                 mark_inode_dirty(dentry->d_inode);
1019                 return 0;
1020         }
1021         else
1022         {
1023                 return -ENOTEMPTY;
1024         }
1025 }
1026
1027
1028 /*
1029  * Create a link...
1030  */
1031 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
1032 {
1033         struct inode *inode = old_dentry->d_inode;
1034         yaffs_Object *obj = NULL;
1035         yaffs_Object *link=NULL;
1036         yaffs_Device *dev;
1037
1038         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
1039
1040         obj = yaffs_InodeToObject(inode);
1041         dev = obj->myDev;
1042
1043         yaffs_GrossLock(dev);
1044
1045         if (!S_ISDIR(inode->i_mode))    // Don't link directories
1046         {
1047                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
1048         }
1049
1050
1051         if(link)
1052         {
1053                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
1054                 d_instantiate(dentry, old_dentry->d_inode);
1055                 atomic_inc(&old_dentry->d_inode->i_count);
1056                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
1057                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
1058
1059         }
1060
1061         yaffs_GrossUnlock(dev);
1062
1063
1064         if(link)
1065         {
1066
1067                 return 0;
1068         }
1069
1070
1071         return -EPERM;
1072 }
1073
1074
1075 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
1076 {
1077         yaffs_Object *obj;
1078         yaffs_Device *dev;
1079
1080         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
1081
1082         dev = yaffs_InodeToObject(dir)->myDev;
1083         yaffs_GrossLock(dev);
1084         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1085                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
1086                                                          symname);
1087         yaffs_GrossUnlock(dev);
1088
1089         if(obj)
1090         {
1091
1092                 struct inode* inode;
1093
1094                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1095                 d_instantiate(dentry, inode);
1096                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
1097                 return 0;
1098         }
1099         else
1100         {
1101                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
1102
1103         }
1104
1105         return -ENOMEM;
1106 }
1107
1108 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
1109 {
1110
1111         yaffs_Object *obj;
1112         yaffs_Device *dev;
1113
1114         obj = yaffs_DentryToObject(dentry);
1115
1116         dev = obj->myDev;
1117
1118         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
1119         yaffs_GrossLock(dev);
1120         yaffs_FlushFile(obj,1);
1121         yaffs_GrossUnlock(dev);
1122         return 0;
1123 }
1124
1125 /*
1126  * The VFS layer already does all the dentry stuff for rename.
1127  *
1128  * NB: POSIX says you can rename an object over an old object of the same name
1129  */
1130 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1131 {
1132         yaffs_Device *dev;
1133         int retVal = YAFFS_FAIL;
1134         int removed = 0;
1135         yaffs_Object *target;
1136
1137         dev = yaffs_InodeToObject(old_dir)->myDev;
1138
1139         yaffs_GrossLock(dev);
1140
1141         // Check if the target is an existing directory that is not empty.
1142         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1143
1144         if(target &&
1145            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1146            !list_empty(&target->variant.directoryVariant.children))
1147         {
1148                 retVal = YAFFS_FAIL;
1149         }
1150         else
1151         {
1152
1153                 // Unlink the target if it exists
1154                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1155
1156
1157                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1158                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1159
1160         }
1161         yaffs_GrossUnlock(dev);
1162
1163         if(retVal == YAFFS_OK)
1164         {
1165                 if(removed == YAFFS_OK)
1166                 {
1167                         new_dentry->d_inode->i_nlink--;
1168                         mark_inode_dirty(new_dentry->d_inode);
1169                 }
1170
1171                 return 0;
1172         }
1173         else
1174         {
1175                 return -ENOTEMPTY;
1176         }
1177
1178
1179 }
1180
1181 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1182 {
1183         struct inode *inode = dentry->d_inode;
1184         int error;
1185         yaffs_Device *dev;
1186
1187         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1188
1189         if((error = inode_change_ok(inode,attr)) == 0)
1190         {
1191
1192                 dev = yaffs_InodeToObject(inode)->myDev;
1193                 yaffs_GrossLock(dev);
1194                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1195                 {
1196                         error = 0;
1197                 }
1198                 else
1199                 {
1200                         error = -EPERM;
1201                 }
1202                 yaffs_GrossUnlock(dev);
1203                 if (!error)
1204                         error = inode_setattr(inode,attr);
1205         }
1206         return error;
1207 }
1208
1209 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
1210 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1211 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1212 #else
1213 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1214 #endif
1215 {
1216
1217
1218         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1219         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1220
1221         yaffs_GrossLock(dev);
1222
1223
1224         buf->f_type = YAFFS_MAGIC;
1225         buf->f_bsize = sb->s_blocksize;
1226         buf->f_namelen = 255;
1227         if(sb->s_blocksize > dev->nBytesPerChunk)
1228         {
1229
1230                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock/
1231                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1232                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1233                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1234         }
1235         else
1236         {
1237
1238                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock *
1239                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1240                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev) *
1241                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1242         }
1243         buf->f_files = 0;
1244         buf->f_ffree = 0;
1245         buf->f_bavail =  buf->f_bfree;
1246
1247         yaffs_GrossUnlock(dev);
1248         return 0;
1249 }
1250
1251 static void yaffs_read_inode (struct inode *inode)
1252 {
1253         // NB This is called as a side effect of other functions and
1254         // thus gross locking should always be in place already.
1255
1256         yaffs_Object *obj ;
1257         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1258
1259         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1260
1261         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1262
1263         yaffs_FillInodeFromObject(inode,obj);
1264
1265 }
1266
1267 static LIST_HEAD(yaffs_dev_list);
1268
1269 static void yaffs_put_super(struct super_block *sb)
1270 {
1271         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1272
1273         yaffs_GrossLock(dev);
1274         if(dev->putSuperFunc)
1275         {
1276                  dev->putSuperFunc(sb);
1277         }
1278         yaffs_Deinitialise(dev);
1279         yaffs_GrossUnlock(dev);
1280
1281         /* we assume this is protected by lock_kernel() in mount/umount */
1282         list_del(&dev->devList);
1283
1284         kfree(dev);
1285 }
1286
1287
1288 #ifdef CONFIG_YAFFS_MTD_ENABLED
1289
1290 static void  yaffs_MTDPutSuper(struct super_block *sb)
1291 {
1292
1293         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1294
1295         if(mtd->sync)
1296         {
1297                 mtd->sync(mtd);
1298         }
1299
1300         put_mtd_device(mtd);
1301 }
1302
1303 #endif
1304
1305
1306 static struct super_block *yaffs_internal_read_super(int yaffsVersion,int useRam, struct super_block * sb, void * data, int silent)
1307 {
1308         int nBlocks;
1309         struct inode * inode = NULL;
1310         struct dentry * root;
1311         yaffs_Device *dev = 0;
1312         int err;
1313
1314         sb->s_magic = YAFFS_MAGIC;
1315         sb->s_op = &yaffs_super_ops;
1316
1317         if(!sb)
1318                 printk(KERN_INFO"yaffs: sb is NULL\n");
1319         else if(!sb->s_dev)
1320                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1321         else if(! kdevname(sb->s_dev))
1322                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1323         else
1324                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1325
1326
1327
1328 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1329         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1330         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1331 #else
1332         sb->s_blocksize = PAGE_CACHE_SIZE;
1333         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1334 #endif
1335         T(YAFFS_TRACE_OS,("yaffs_read_super: Using yaffs%d\n",yaffsVersion));
1336         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1337
1338 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1339         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1340 #endif
1341
1342
1343
1344         if(useRam)
1345         {
1346
1347 #ifdef CONFIG_YAFFS_RAM_ENABLED
1348                 // Set the yaffs_Device up for ram emulation
1349
1350
1351 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1352                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1353 #else
1354                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1355 #endif
1356
1357                 if(!dev)
1358                 {
1359                         // Deep shit could not allocate device structure
1360                         T(YAFFS_TRACE_OS,("yaffs_read_super: Failed trying to allocate yaffs_Device.\n"));
1361                         return NULL;
1362                 }
1363
1364                 memset(dev,0,sizeof(yaffs_Device));
1365                 dev->genericDevice = NULL; // Not used for RAM emulation.
1366                 dev->name = sb->s_type->name;
1367
1368                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1369                 dev->startBlock = 0;
1370                 dev->endBlock = nBlocks - 1;
1371                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1372                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1373                 dev->nReservedBlocks = 5;
1374
1375                 if(yaffsVersion == 2)
1376                 {
1377                         dev->writeChunkWithTagsToNAND  = nandemul2k_WriteChunkWithTagsToNAND;
1378                         dev->readChunkWithTagsFromNAND = nandemul2k_ReadChunkWithTagsFromNAND;
1379                         dev->markNANDBlockBad          = nandemul2k_MarkNANDBlockBad;
1380                         dev->queryNANDBlock            = nandemul2k_QueryNANDBlock;
1381                         dev->eraseBlockInNAND          = nandemul2k_EraseBlockInNAND;
1382                         dev->initialiseNAND            = nandemul2k_InitialiseNAND;
1383                         dev->isYaffs2 = 1;
1384                         dev->nChunksPerBlock = nandemul2k_GetChunksPerBlock();
1385                         dev->nBytesPerChunk =  nandemul2k_GetBytesPerChunk();;
1386                         nBlocks = nandemul2k_GetNumberOfBlocks();
1387                         dev->startBlock = 0;
1388                         dev->endBlock = nBlocks - 1;
1389                 }
1390                 else
1391                 {
1392                         dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1393                         dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1394                         dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1395                         dev->initialiseNAND = nandemul_InitialiseNAND;
1396                         dev->isYaffs2 = 0;
1397                 }
1398 #endif
1399
1400         }
1401         else
1402         {
1403 #ifdef CONFIG_YAFFS_MTD_ENABLED
1404                 struct mtd_info *mtd;
1405
1406                 T(YAFFS_TRACE_ALWAYS,("yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1407                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev)));
1408
1409                 // Check it's an mtd device.....
1410                 if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1411                 {
1412                         return NULL; // This isn't an mtd device
1413                 }
1414
1415                 // Get the device
1416                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1417                 if (!mtd)
1418                 {
1419                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev)));
1420                         return NULL;
1421                 }
1422
1423                 // Check it's NAND
1424                 if(mtd->type != MTD_NANDFLASH)
1425                 {
1426                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1427                         return NULL;
1428                 }
1429
1430                 T(YAFFS_TRACE_OS,(" erase %p\n",mtd->erase));
1431                 T(YAFFS_TRACE_OS,(" read %p\n",mtd->read));
1432                 T(YAFFS_TRACE_OS,(" write %p\n",mtd->write));
1433                 T(YAFFS_TRACE_OS,(" readoob %p\n",mtd->read_oob));
1434                 T(YAFFS_TRACE_OS,(" writeoob %p\n",mtd->write_oob));
1435                 T(YAFFS_TRACE_OS,(" block_isbad %p\n",mtd->block_isbad));
1436                 T(YAFFS_TRACE_OS,(" block_markbad %p\n",mtd->block_markbad));
1437                 T(YAFFS_TRACE_OS,(" oobblock %d\n",mtd->oobblock));
1438                 T(YAFFS_TRACE_OS,(" oobsize %d\n",mtd->oobsize));
1439                 T(YAFFS_TRACE_OS,(" erasesize %d\n",mtd->erasesize));
1440                 T(YAFFS_TRACE_OS,(" size %d\n",mtd->size));
1441
1442                 if(yaffsVersion == 2)
1443                 {
1444                         // Check for version 2 style functions
1445                         if(!mtd->erase ||
1446                            !mtd->block_isbad ||
1447                            !mtd->block_markbad ||
1448                            !mtd->read  ||
1449                            !mtd->write ||
1450 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1451                            !mtd->write_ecc ||
1452                            !mtd->read_ecc ||
1453 #endif
1454                            !mtd->read_oob ||
1455                            !mtd->write_oob )
1456                         {
1457                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1458                                 return NULL;
1459                         }
1460
1461                         if(mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1462                            mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE)
1463                         {
1464                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1465                                 return NULL;
1466                         }               }
1467                 else
1468                 {
1469                         // Check for V1 style functions
1470                         if(!mtd->erase ||
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_BYTES_PER_CHUNK ||
1485                            mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1486                         {
1487                                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1488                                 return NULL;
1489                         }
1490                 }
1491
1492
1493                         // OK, so if we got here, we have an MTD that's NAND and looks
1494                         // like it has the right capabilities
1495                         // Set the yaffs_Device up for mtd
1496
1497 //#if defined(CONFIG_KERNEL_2_5)
1498 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1499                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1500 #else
1501                 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1502 #endif
1503                 if(!dev)
1504                 {
1505                         // Deep shit could not allocate device structure
1506                         T(YAFFS_TRACE_ALWAYS,("yaffs_read_super: Failed trying to allocate yaffs_Device. \n"));
1507                         return NULL;
1508                 }
1509
1510                 memset(dev,0,sizeof(yaffs_Device));
1511                 dev->genericDevice = mtd;
1512                 dev->name = mtd->name;
1513
1514                 // Set up the memory size parameters....
1515
1516                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1517                 dev->startBlock = 0;
1518                 dev->endBlock = nBlocks - 1;
1519                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1520                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1521                 dev->nReservedBlocks = 5;
1522                 dev->nShortOpCaches = 10; // Enable short op caching
1523
1524
1525                 // ... and the functions.
1526                 if(yaffsVersion == 2)
1527                 {
1528                         dev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND;
1529                         dev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND;
1530                         dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1531                         dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1532                         dev->spareBuffer = YMALLOC(mtd->oobsize);
1533                         dev->isYaffs2 = 1;
1534                         dev->nBytesPerChunk = mtd->oobblock;
1535                         dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1536                         nBlocks = mtd->size / mtd->erasesize;
1537                         dev->startBlock = 0;
1538                         dev->endBlock = nBlocks - 1;
1539                 }
1540                 else
1541                 {
1542                         dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1543                         dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1544                         dev->isYaffs2 = 0;
1545                 }
1546                 // ... and common functions
1547                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1548                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1549
1550                 dev->putSuperFunc = yaffs_MTDPutSuper;
1551
1552 #ifdef CONFIG_YAFFS_USE_NANDECC
1553                 dev->useNANDECC = 1;
1554 #endif
1555 #endif
1556         }
1557
1558         /* we assume this is protected by lock_kernel() in mount/umount */
1559         list_add_tail(&dev->devList, &yaffs_dev_list);
1560
1561         init_MUTEX(&dev->grossLock);
1562
1563
1564         yaffs_GrossLock(dev);
1565
1566         err = yaffs_GutsInitialise(dev);
1567
1568         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised %s\n", (err == YAFFS_OK) ? "OK" : "FAILED"));
1569
1570         // Create root inode
1571         if(err == YAFFS_OK)
1572           inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(dev));
1573
1574         yaffs_GrossUnlock(dev);
1575
1576         if (!inode)
1577                 return NULL;
1578
1579 // added NCB
1580         inode->i_op = & yaffs_dir_inode_operations;
1581         inode->i_fop = & yaffs_dir_operations;
1582
1583         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1584
1585
1586         root = d_alloc_root(inode);
1587
1588         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1589
1590         if (!root) {
1591                 iput(inode);
1592                 return NULL;
1593         }
1594         sb->s_root = root;
1595
1596         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1597         return sb;
1598 }
1599
1600
1601
1602 #ifdef CONFIG_YAFFS_MTD_ENABLED
1603
1604 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1605 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1606 {
1607          return yaffs_internal_read_super(1,0,sb,data,silent) ? 0 : -1;
1608 }
1609
1610 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1611 {
1612
1613     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1614 }
1615
1616 /* changes NCB 2.5.70 */
1617 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1618 static struct file_system_type yaffs_fs_type = {
1619         .owner          = THIS_MODULE,
1620         .name           = "yaffs",
1621         .get_sb         = yaffs_read_super,
1622         .kill_sb        = kill_block_super,
1623 //      .kill_sb        = kill_litter_super,
1624         .fs_flags       = FS_REQUIRES_DEV,
1625 };
1626 #else
1627 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1628 {
1629         return yaffs_internal_read_super(1,0,sb,data,silent);
1630 }
1631
1632 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1633 #endif
1634
1635 #endif // CONFIG_YAFFS_MTD_ENABLED
1636
1637 #ifdef CONFIG_YAFFS2_MTD_ENABLED
1638
1639 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1640 static int yaffs2_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1641 {
1642          return yaffs_internal_read_super(2,0,sb,data,silent) ? 0 : -1;
1643 }
1644
1645 static struct super_block *yaffs2_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1646 {
1647
1648     return get_sb_bdev(fs, flags, dev_name, data, yaffs2_internal_read_super_mtd);
1649 }
1650
1651 /* changes NCB 2.5.70 */
1652 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1653 static struct file_system_type yaffs2_fs_type = {
1654         .owner          = THIS_MODULE,
1655         .name           = "yaffs2",
1656         .get_sb         = yaffs2_read_super,
1657         .kill_sb        = kill_block_super,
1658 //      .kill_sb        = kill_litter_super,
1659         .fs_flags       = FS_REQUIRES_DEV,
1660 };
1661 #else
1662 static struct super_block *yaffs2_read_super(struct super_block * sb, void * data, int silent)
1663 {
1664         return yaffs_internal_read_super(2,0,sb,data,silent);
1665 }
1666
1667 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, FS_REQUIRES_DEV);
1668 #endif
1669
1670 #endif // CONFIG_YAFFS2_MTD_ENABLED
1671
1672
1673 #ifdef CONFIG_YAFFS_RAM_ENABLED
1674
1675 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1676 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1677 {
1678          return yaffs_internal_read_super(1,1,sb,data,silent) ? 0 : -1;
1679 }
1680
1681 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1682 {
1683
1684     return get_sb_nodev(fs, flags, data, yaffs_internal_read_super_ram);
1685 }
1686
1687
1688 static struct file_system_type yaffs_ram_fs_type = {
1689         .owner          = THIS_MODULE,
1690         .name           = "yaffsram",
1691         .get_sb         = yaffs_ram_read_super,
1692         .kill_sb        = kill_litter_super,
1693         .fs_flags       = 0 ,
1694 };
1695 #else
1696 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1697 {
1698         return yaffs_internal_read_super(1,1,sb,data,silent);
1699 }
1700
1701 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1702 #endif
1703
1704 #endif // CONFIG_YAFFS_RAM_ENABLED
1705
1706 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1707
1708 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1709 static int yaffs2_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1710 {
1711          return yaffs_internal_read_super(2,1,sb,data,silent) ? 0 : -1;
1712 }
1713
1714 static struct super_block *yaffs2_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1715 {
1716
1717     return get_sb_nodev(fs, flags, data, yaffs2_internal_read_super_ram);
1718 }
1719
1720
1721 static struct file_system_type yaffs2_ram_fs_type = {
1722         .owner          = THIS_MODULE,
1723         .name           = "yaffs2ram",
1724         .get_sb         = yaffs2_ram_read_super,
1725         .kill_sb        = kill_litter_super,
1726         .fs_flags       = 0 ,
1727 };
1728 #else
1729 static struct super_block *yaffs2_ram_read_super(struct super_block * sb, void * data, int silent)
1730 {
1731         return yaffs_internal_read_super(2,1,sb,data,silent);
1732 }
1733
1734 static DECLARE_FSTYPE(yaffs2_ram_fs_type, "yaffs2ram", yaffs2_ram_read_super, FS_SINGLE);
1735 #endif
1736
1737 #endif // CONFIG_YAFFS2_RAM_ENABLED
1738
1739
1740
1741 static struct proc_dir_entry *my_proc_entry;
1742 static struct proc_dir_entry *my_proc_ram_write_entry;
1743
1744 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev)
1745 {
1746         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1747         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1748         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1749         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1750         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1751         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1752         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1753         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1754         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1755         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1756         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1757         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1758         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1759         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1760         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1761         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1762         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1763         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1764         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1765         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1766         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1767         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1768         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1769         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1770         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1771         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1772         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1773         buf +=sprintf(buf,"isYaffs2........... %d\n",dev->isYaffs2);
1774
1775         return buf;
1776 }
1777
1778 static int  yaffs_proc_read(
1779         char *page,
1780         char **start,
1781         off_t offset,
1782         int count,
1783         int *eof,
1784         void *data
1785         )
1786 {
1787         struct list_head *item;
1788         char *buf = page;
1789         int step = offset;
1790         int n = 0;
1791
1792         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
1793          * We use 'offset' (*ppos) to indicate where we are in devList.
1794          * This also assumes the user has posted a read buffer large
1795          * enough to hold the complete output; but that's life in /proc.
1796          */
1797
1798         *(int *)start = 1;
1799
1800         /* Print header first */
1801         if (step == 0) {
1802                 buf += sprintf(buf, "YAFFS built:" __DATE__ " "__TIME__
1803                 "\n%s\n%s\n", yaffs_fs_c_version, yaffs_guts_c_version);
1804         }
1805
1806         /* hold lock_kernel while traversing yaffs_dev_list */
1807         lock_kernel();
1808
1809         /* Locate and print the Nth entry.  Order N-squared but N is small. */
1810         list_for_each(item, &yaffs_dev_list) {
1811                 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
1812                 if (n < step) {
1813                         n++;
1814                         continue;
1815                 }
1816                 buf += sprintf(buf,"\nDevice %d \"%s\"\n", n, dev->name);
1817                 buf = yaffs_dump_dev(buf, dev);
1818                 break;
1819         }
1820         unlock_kernel();
1821
1822         return buf-page < count ? buf-page : count;
1823 }
1824
1825 static int  yaffs_proc_ram_write(
1826         char *page,
1827         char **start,
1828         off_t offset,
1829         int count,
1830         int *eof,
1831         void *data
1832         )
1833 {
1834
1835         printk(KERN_DEBUG "yaffs write size %d\n",count);
1836         return count;
1837 }
1838
1839
1840
1841 // Stuff to handle installation of file systems
1842 struct file_system_to_install
1843 {
1844    struct file_system_type *fst;
1845    int installed;
1846 };
1847
1848 static struct file_system_to_install fs_to_install[] =
1849 {
1850 #ifdef CONFIG_YAFFS_RAM_ENABLED
1851      { &yaffs_ram_fs_type, 0},
1852 #endif
1853 #ifdef CONFIG_YAFFS2_RAM_ENABLED
1854      { &yaffs2_ram_fs_type,0},
1855 #endif
1856 #ifdef CONFIG_YAFFS_MTD_ENABLED
1857      { &yaffs_fs_type,0},
1858 #endif
1859 #ifdef CONFIG_YAFFS2_MTD_ENABLED
1860      { &yaffs2_fs_type,0},
1861 #endif
1862      { NULL,0}
1863 };
1864
1865 static int __init init_yaffs_fs(void)
1866 {
1867         int error = 0;
1868         struct file_system_to_install *fsinst;
1869
1870    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
1871
1872
1873
1874     /* Install the proc_fs entry */
1875     my_proc_entry = create_proc_read_entry("yaffs",
1876                                            S_IRUGO | S_IFREG,
1877                                            &proc_root,
1878                                            yaffs_proc_read,
1879                                            NULL);
1880     if(!my_proc_entry)
1881     {
1882        return -ENOMEM;
1883     }
1884
1885
1886
1887     // Now add the file system entries
1888
1889     fsinst = fs_to_install;
1890
1891     while(fsinst->fst && !error)
1892     {
1893       error = register_filesystem(fsinst->fst);
1894       if(!error)
1895       {
1896           fsinst->installed = 1;
1897       }
1898       fsinst++;
1899     }
1900
1901     // Any errors? uninstall
1902     if(error)
1903     {
1904             fsinst = fs_to_install;
1905
1906             while(fsinst->fst)
1907             {
1908               if(fsinst->installed)
1909               {
1910                 unregister_filesystem(fsinst->fst);
1911                 fsinst->installed = 0;
1912               }
1913               fsinst++;
1914             }
1915     }
1916
1917     return error;
1918 }
1919
1920 static void __exit exit_yaffs_fs(void)
1921 {
1922
1923    struct file_system_to_install *fsinst;
1924
1925    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " removing. \n"));
1926
1927    remove_proc_entry("yaffs",&proc_root);
1928
1929     fsinst = fs_to_install;
1930
1931     while(fsinst->fst)
1932     {
1933       if(fsinst->installed)
1934       {
1935         unregister_filesystem(fsinst->fst);
1936         fsinst->installed = 0;
1937       }
1938       fsinst++;
1939     }
1940
1941 }
1942
1943 module_init(init_yaffs_fs)
1944 module_exit(exit_yaffs_fs)
1945
1946 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
1947 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002,2003,2004");
1948 MODULE_LICENSE("GPL");
1949
1950