yaffs_fs.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  * yaffs_fs.c
   4  *
   5  * Copyright (C) 2002 Aleph One Ltd.
   6  *   for Toby Churchill Ltd and Brightstar Engineering
   7  *
   8  * Created by Charles Manning <charles@aleph1.co.uk>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * This is the file system front-end to YAFFS that hooks it up to
  15  * the VFS.
  16  *
  17  * Special notes:
  18  * >> sb->u.generic_sbp points to the yaffs_Device associated with this superblock
  19  * >> inode->u.generic_ip points to the associated yaffs_Object.
  20  *
  21  *
  22  * Acknowledgements:
  23  * * Luc van OostenRyck for numerous patches.
  24  * * Nick Bane for numerous patches.
  25  * * Nick Bane for 2.5/2.6 integration.
  26  * * Andras Toth for mknod rdev issue.
  27  * * Some code bodily lifted from JFFS2.
  28  */
  29
  30
  31 const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.34 2004-09-20 22:00:20 charles Exp $";
  32 extern const char *yaffs_guts_c_version;
  33
  34
  35 #include <linux/config.h>
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/version.h>
  39 #include <linux/slab.h>
  40 #include <linux/init.h>
  41 #include <linux/list.h>
  42 #include <linux/fs.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/pagemap.h>
  45 #include <linux/mtd/mtd.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/string.h>
  48
  49
  50 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  51
  52 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  53 #include <asm/statfs.h>
  54 #define UnlockPage(p) unlock_page(p)
  55 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  56 //#define kdevname(x) cdevname(to_kdev_t(x))
  57 #define kdevname(x) "(unavailable)"     // temporary fix
  58
  59 #else
  60
  61 #include <linux/locks.h>
  62
  63 #endif
  64
  65
  66 #include <asm/uaccess.h>
  67
  68 #include "yportenv.h"
  69 #include "yaffs_guts.h"
  70
  71
  72
  73
  74 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
  75
  76 #ifdef CONFIG_YAFFS_RAM_ENABLED
  77 #include "yaffs_nandemul.h"
  78 // 2 MB of RAM for emulation
  79 #define YAFFS_RAM_EMULATION_SIZE  0x200000
  80 #endif //CONFIG_YAFFS_RAM_ENABLED
  81
  82 #ifdef CONFIG_YAFFS_MTD_ENABLED
  83 #include <linux/mtd/mtd.h>
  84 #include "yaffs_mtdif.h"
  85 #endif //CONFIG_YAFFS_MTD_ENABLED
  86
  87 //#define T(x) printk x
  88
  89
  90
  91 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
  92 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
  93 //NCB #define yaffs_SuperToDevice(sb)   ((yaffs_Device *)sb->u.generic_sbp)
  94
  95 //#if defined(CONFIG_KERNEL_2_5)
  96 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  97 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
  98 #else
  99 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 100 #endif
 101
 102
 103 static void yaffs_put_super(struct super_block *sb);
 104
 105 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos);
 106 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
 107 static int yaffs_file_flush(struct file* file);
 108
 109 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
 110
 111 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 112
 113 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 114 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 115 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n);
 116 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n);
 117 #else
 118 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 119 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
 120 #endif
 121 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
 122 static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
 123 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
 124 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
 125
 126 //#if defined(CONFIG_KERNEL_2_5)
 127 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 128 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
 129 #else
 130 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
 131 #endif
 132 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
 133 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 134
 135 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 136 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 137 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 138 #else
 139 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 140 #endif
 141 static void yaffs_read_inode (struct inode *inode);
 142
 143 //#if defined(CONFIG_KERNEL_2_5)
 144 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 145 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data);
 146 #else
 147 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent);
 148 #endif
 149
 150 static void yaffs_put_inode (struct inode *inode);
 151 static void yaffs_delete_inode(struct inode *);
 152 static void yaffs_clear_inode(struct inode *);
 153
 154 static int yaffs_readpage(struct file *file, struct page * page);
 155 static int yaffs_writepage(struct page *page);
 156 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 157 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 158
 159 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen);
 160 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 161
 162
 163
 164
 165 static struct address_space_operations yaffs_file_address_operations = {
 166         readpage:               yaffs_readpage,
 167         writepage:              yaffs_writepage,
 168         prepare_write:  yaffs_prepare_write,
 169         commit_write:   yaffs_commit_write
 170 };
 171
 172
 173 static struct file_operations yaffs_file_operations = {
 174 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
 175         read:           generic_file_read,
 176         write:          generic_file_write,
 177 #else
 178         read:           yaffs_file_read,
 179         write:          yaffs_file_write,
 180 #endif
 181         mmap:           generic_file_mmap,
 182         flush:          yaffs_file_flush,
 183         fsync:          yaffs_sync_object,
 184 };
 185
 186
 187 static struct inode_operations yaffs_file_inode_operations = {
 188         setattr:        yaffs_setattr,
 189 };
 190
 191
 192 struct inode_operations yaffs_symlink_inode_operations =
 193 {
 194         readlink:       yaffs_readlink,
 195         follow_link:    yaffs_follow_link,
 196         setattr:        yaffs_setattr
 197 };
 198
 199 static struct inode_operations yaffs_dir_inode_operations = {
 200         create:         yaffs_create,
 201         lookup:         yaffs_lookup,
 202         link:           yaffs_link,
 203         unlink:         yaffs_unlink,
 204         symlink:        yaffs_symlink,
 205         mkdir:          yaffs_mkdir,
 206         rmdir:          yaffs_unlink,
 207         mknod:          yaffs_mknod,
 208         rename:         yaffs_rename,
 209         setattr:        yaffs_setattr,
 210 };
 211
 212 static struct file_operations yaffs_dir_operations = {
 213         read:           generic_read_dir,
 214         readdir:        yaffs_readdir,
 215         fsync:          yaffs_sync_object,
 216 };
 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 //      remount_fs:
 225         delete_inode:           yaffs_delete_inode,
 226         clear_inode:            yaffs_clear_inode,
 227 };
 228
 229
 230
 231 static void yaffs_GrossLock(yaffs_Device *dev)
 232 {
 233         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
 234
 235         down(&dev->grossLock);
 236 }
 237
 238 static void yaffs_GrossUnlock(yaffs_Device *dev)
 239 {
 240         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
 241         up(&dev->grossLock);
 242
 243 }
 244
 245 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen)
 246 {
 247         unsigned char *alias;
 248         int ret;
 249
 250         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 251
 252
 253         yaffs_GrossLock(dev);
 254
 255         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 256
 257         yaffs_GrossUnlock(dev);
 258
 259         if(!alias)
 260                 return -ENOMEM;
 261
 262         ret = vfs_readlink(dentry, buffer, buflen, alias);
 263         kfree(alias);
 264         return ret;
 265 }
 266
 267 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 268 {
 269         unsigned char *alias;
 270         int ret;
 271         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 272
 273
 274         yaffs_GrossLock(dev);
 275
 276         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 277
 278         yaffs_GrossUnlock(dev);
 279
 280         if(!alias)
 281                 return -ENOMEM;
 282
 283         ret = vfs_follow_link(nd,alias);
 284         kfree(alias);
 285         return ret;
 286 }
 287
 288
 289 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 290
 291 /*
 292  * Lookup is used to find objects in the fs
 293  */
 294 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 295 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 296
 297 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 298 #else
 299 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 300 #endif
 301 {
 302         yaffs_Object *obj;
 303         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 304
 305         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 306
 307
 308         yaffs_GrossLock(dev);
 309
 310
 311         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 312
 313         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 314
 315         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 316
 317
 318
 319         if(obj)
 320         {
 321                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 322
 323                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode,0,obj);
 324
 325                 if(inode)
 326                 {
 327                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
 328 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 329 #if 0
 330                         //dget(dentry); // try to solve directory bug
 331                         d_add(dentry,inode);
 332
 333                         yaffs_GrossUnlock(dev);
 334
 335                         // return dentry;
 336                         return NULL;
 337 #endif
 338                 }
 339
 340         }
 341         else
 342         {
 343                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
 344
 345         }
 346         yaffs_GrossUnlock(dev);
 347
 348 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 349         d_add(dentry,inode);
 350
 351         return NULL;
 352         //      return (ERR_PTR(-EIO));
 353
 354 }
 355
 356 // For now put inode is just for debugging
 357 // Put inode is called when the inode **structure** is put.
 358 static void yaffs_put_inode(struct inode *inode)
 359 {
 360         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 361
 362 }
 363
 364 // clear is called to tell the fs to release any per-inode data it holds
 365 static void yaffs_clear_inode(struct inode *inode)
 366 {
 367         yaffs_Object *obj = yaffs_InodeToObject(inode);
 368
 369         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 370                 obj ? "object exists" : "null object"));
 371
 372         if(obj)
 373         {
 374                 obj->myInode = NULL;
 375                 inode->u.generic_ip = NULL;
 376         }
 377
 378
 379 }
 380
 381 // delete is called when the link count is zero and the inode
 382 // is put (ie. nobody wants to know about it anymore, time to
 383 // delete the file).
 384 // NB Must call clear_inode()
 385 static void yaffs_delete_inode(struct inode *inode)
 386 {
 387         yaffs_Object *obj = yaffs_InodeToObject(inode);
 388         yaffs_Device *dev;
 389
 390         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 391                 obj ? "object exists" : "null object"));
 392
 393         if(obj)
 394         {
 395                 dev = obj->myDev;
 396                 yaffs_GrossLock(dev);
 397                 yaffs_DeleteFile(obj);
 398                 yaffs_GrossUnlock(dev);
 399         }
 400         clear_inode(inode);
 401 }
 402
 403
 404 static int yaffs_file_flush(struct file* file)
 405 {
 406         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 407
 408         yaffs_Device *dev = obj->myDev;
 409
 410         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 411                                 obj->dirty ? "dirty" : "clean"));
 412
 413         yaffs_GrossLock(dev);
 414
 415     yaffs_FlushFile(obj,1);
 416
 417         yaffs_GrossUnlock(dev);
 418
 419     return 0;
 420 }
 421
 422
 423
 424 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 425 {
 426         // Lifted from jffs2
 427
 428         yaffs_Object *obj;
 429         unsigned char *pg_buf;
 430         int ret;
 431
 432         yaffs_Device *dev;
 433
 434         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 435                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 436
 437         obj  = yaffs_DentryToObject(f->f_dentry);
 438
 439         dev = obj->myDev;
 440
 441
 442         if (!PageLocked(pg))
 443                 PAGE_BUG(pg);
 444
 445         pg_buf = kmap(pg);
 446         /* FIXME: Can kmap fail? */
 447
 448         yaffs_GrossLock(dev);
 449
 450         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 451
 452         yaffs_GrossUnlock(dev);
 453
 454         if(ret >= 0) ret = 0;
 455
 456         if (ret) {
 457                 ClearPageUptodate(pg);
 458                 SetPageError(pg);
 459         } else {
 460                 SetPageUptodate(pg);
 461                 ClearPageError(pg);
 462         }
 463
 464         flush_dcache_page(pg);
 465         kunmap(pg);
 466
 467
 468         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
 469         return ret;
 470 }
 471
 472 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 473 {
 474         int ret = yaffs_readpage_nolock(f,pg);
 475         UnlockPage(pg);
 476         return ret;
 477 }
 478
 479 static int yaffs_readpage(struct file *f, struct page * pg)
 480 {
 481         return yaffs_readpage_unlock(f,pg);
 482 }
 483
 484 // writepage inspired by/stolen from smbfs
 485 //
 486
 487 static int yaffs_writepage(struct page *page)
 488 {
 489         struct address_space *mapping = page->mapping;
 490         struct inode *inode;
 491         unsigned long end_index;
 492         char *buffer;
 493         yaffs_Object *obj;
 494         int nWritten = 0;
 495         unsigned nBytes;
 496
 497         if (!mapping)
 498                 BUG();
 499         inode = mapping->host;
 500         if (!inode)
 501                 BUG();
 502
 503         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 504
 505         /* easy case */
 506         if (page->index < end_index)
 507         {
 508                 nBytes = PAGE_CACHE_SIZE;
 509         }
 510         else
 511         {
 512                 nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
 513         }
 514         //  What's happening here?
 515         ///* OK, are we completely out? */
 516         //if (page->index >= end_index+1 || !offset)
 517         //      return -EIO;
 518
 519         get_page(page);
 520
 521
 522         buffer = kmap(page);
 523
 524         obj = yaffs_InodeToObject(inode);
 525         yaffs_GrossLock(obj->myDev);
 526
 527
 528         nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes);
 529
 530         yaffs_GrossUnlock(obj->myDev);
 531
 532         kunmap(page);
 533         SetPageUptodate(page);
 534         UnlockPage(page);
 535         put_page(page);
 536
 537         return (nWritten == nBytes) ? 0  : -ENOSPC;
 538 }
 539
 540
 541
 542 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 543 {
 544
 545         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
 546         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 547                 return  yaffs_readpage_nolock(f,pg);
 548
 549         return 0;
 550
 551 }
 552
 553 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 554 {
 555
 556         void *addr = page_address(pg) + offset;
 557         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 558         int nBytes = to - offset;
 559         int nWritten;
 560
 561         unsigned spos = pos;
 562         unsigned saddr = (unsigned)addr;
 563
 564         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 565
 566         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 567
 568         if(nWritten != nBytes)
 569         {
 570                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 571                 SetPageError(pg);
 572                 ClearPageUptodate(pg);
 573         }
 574         else
 575         {
 576                 SetPageUptodate(pg);
 577         }
 578
 579         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 580
 581         return nWritten;
 582
 583 }
 584
 585
 586
 587 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 588 {
 589         if (inode && obj)
 590         {
 591                 inode->i_ino = obj->objectId;
 592                 inode->i_mode = obj->st_mode;
 593                 inode->i_uid = obj->st_uid;
 594                 inode->i_gid = obj->st_gid;
 595                 inode->i_blksize = inode->i_sb->s_blocksize;
 596 //#if defined(CONFIG_KERNEL_2_5)
 597 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 598
 599                 inode->i_rdev = old_decode_dev(obj->st_rdev);
 600                 inode->i_atime.tv_sec = (time_t)(obj->st_atime);
 601                 inode->i_atime.tv_nsec = 0;
 602                 inode->i_mtime.tv_sec = (time_t)obj->st_mtime;
 603                 inode->i_mtime.tv_nsec =0;
 604                 inode->i_ctime.tv_sec = (time_t)obj->st_ctime;
 605                 inode->i_ctime.tv_nsec = 0;
 606 #else
 607                 inode->i_rdev = obj->st_rdev;
 608                 inode->i_atime = obj->st_atime;
 609                 inode->i_mtime = obj->st_mtime;
 610                 inode->i_ctime = obj->st_ctime;
 611 #endif
 612                 inode->i_size = yaffs_GetObjectFileLength(obj);
 613                 inode->i_blocks = (inode->i_size + 511) >> 9;
 614
 615                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 616
 617                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 618                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 619
 620                 switch (obj->st_mode & S_IFMT)
 621                 {
 622                         default: // fifo, device or socket
 623                                 init_special_inode(inode, obj->st_mode,(dev_t)(obj->st_rdev));
 624                                 break;
 625                         case S_IFREG:   // file
 626                                 inode->i_op = &yaffs_file_inode_operations;
 627                                 inode->i_fop = &yaffs_file_operations;
 628                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 629                                 break;
 630                         case S_IFDIR:   // directory
 631                                 inode->i_op = &yaffs_dir_inode_operations;
 632                                 inode->i_fop = &yaffs_dir_operations;
 633                                 break;
 634                         case S_IFLNK:   // symlink
 635                                 inode->i_op = &yaffs_symlink_inode_operations;
 636                                 break;
 637                 }
 638
 639
 640                 inode->u.generic_ip = obj;
 641                 obj->myInode = inode;
 642
 643         }
 644         else
 645         {
 646                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 647         }
 648
 649 }
 650
 651 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 652 {
 653         struct inode * inode;
 654
 655         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 656
 657         inode = iget(sb,obj->objectId);
 658
 659         // NB Side effect: iget calls back to yaffs_read_inode().
 660         // iget also increments the inode's i_count
 661
 662         return inode;
 663 }
 664
 665 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 666 {
 667         yaffs_Object *obj;
 668         int nRead,ipos;
 669         struct inode *inode;
 670         yaffs_Device *dev;
 671
 672         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n"));
 673
 674         obj  = yaffs_DentryToObject(f->f_dentry);
 675
 676         dev = obj->myDev;
 677
 678         yaffs_GrossLock(dev);
 679
 680         inode = f->f_dentry->d_inode;
 681
 682         if (*pos < inode->i_size)
 683         {
 684                         if (*pos + n > inode->i_size)
 685                         {
 686                                 n = inode->i_size - *pos;
 687                         }
 688         }
 689         else
 690         {
 691                 n = 0;
 692         }
 693
 694         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 695         if(nRead > 0)
 696         {
 697                 f->f_pos += nRead;
 698         }
 699
 700         yaffs_GrossUnlock(dev);
 701
 702         ipos = *pos;
 703
 704         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 705         return nRead;
 706
 707 }
 708
 709
 710 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 711 {
 712         yaffs_Object *obj;
 713         int nWritten,ipos;
 714         struct inode *inode;
 715         yaffs_Device *dev;
 716
 717
 718         obj  = yaffs_DentryToObject(f->f_dentry);
 719
 720         dev = obj->myDev;
 721
 722         yaffs_GrossLock(dev);
 723
 724         inode = f->f_dentry->d_inode;
 725
 726         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 727         {
 728                 ipos = inode->i_size;
 729         }
 730         else
 731         {
 732                 ipos = *pos;
 733         }
 734
 735
 736         if(!obj)
 737         {
 738                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 739         }
 740         else
 741         {
 742                 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));
 743         }
 744
 745         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n);
 746
 747         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 748         if(nWritten > 0)
 749         {
 750                 ipos += nWritten;
 751                 *pos = ipos;
 752                 if(ipos > inode->i_size)
 753                 {
 754                         inode->i_size = ipos;
 755                         inode->i_blocks = (ipos + 511)>>9;
 756
 757                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 758                 }
 759
 760         }
 761         yaffs_GrossUnlock(dev);
 762
 763         return nWritten != n ? -ENOSPC : nWritten;
 764 }
 765
 766
 767 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 768 {
 769         yaffs_Object *obj;
 770         yaffs_Device *dev;
 771         struct inode *inode = f->f_dentry->d_inode;
 772         unsigned long offset, curoffs;
 773         struct list_head *i;
 774         yaffs_Object *l;
 775
 776         char name[YAFFS_MAX_NAME_LENGTH +1];
 777
 778         obj =  yaffs_DentryToObject(f->f_dentry);
 779         dev = obj->myDev;
 780
 781         yaffs_GrossLock(dev);
 782
 783         offset = f->f_pos;
 784
 785         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 786
 787         if(offset == 0)
 788         {
 789         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 790                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 791                 {
 792                         goto out;
 793                 }
 794                 offset++;
 795                 f->f_pos++;
 796         }
 797         if(offset == 1)
 798         {
 799                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 800                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 801                 {
 802                         goto out;
 803                 }
 804                 offset++;
 805                 f->f_pos++;
 806         }
 807
 808         curoffs = 1;
 809
 810         list_for_each(i,&obj->variant.directoryVariant.children)
 811         {
 812                 curoffs++;
 813                 if(curoffs >= offset)
 814                 {
 815                         l = list_entry(i, yaffs_Object,siblings);
 816
 817                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 818                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 819
 820                         if(filldir(dirent,
 821                                            name,
 822                                            strlen(name),
 823                                            offset,
 824                                            yaffs_GetObjectInode(l),
 825                                            yaffs_GetObjectType(l))
 826                                            < 0)
 827                         {
 828                                 goto up_and_out;
 829                         }
 830
 831                         offset++;
 832                         f->f_pos++;
 833                 }
 834         }
 835
 836   up_and_out:
 837   out:
 838
 839     yaffs_GrossUnlock(dev);
 840
 841         return 0;
 842 }
 843
 844
 845 /*
 846  * File creation. Allocate an inode, and we're done..
 847  */
 848 //#if defined(CONFIG_KERNEL_2_5)
 849 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 850 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 851 #else
 852 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 853 #endif
 854 {
 855         struct inode *inode;
 856
 857         yaffs_Object *obj = NULL;
 858         yaffs_Device *dev;
 859
 860         yaffs_Object *parent = yaffs_InodeToObject(dir);
 861
 862         int error = -ENOSPC;
 863
 864         if(parent)
 865         {
 866                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 867                                          parent->objectId,parent->variantType));
 868         }
 869         else
 870         {
 871                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 872                 return -EPERM;
 873         }
 874
 875         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 876                                         dentry->d_name.name, mode,rdev));
 877
 878         dev = parent->myDev;
 879
 880         yaffs_GrossLock(dev);
 881
 882         switch (mode & S_IFMT)
 883         {
 884                 default:
 885                         // Special (socket, fifo, device...)
 886                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 887                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 888                         break;
 889                 case S_IFREG:   // file
 890                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 891                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 892                         break;
 893                 case S_IFDIR:   // directory
 894                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 895                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 896                         break;
 897                 case S_IFLNK:   // symlink
 898                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 899                         obj = NULL; // Do we ever get here?
 900                         break;
 901         }
 902
 903         if(obj)
 904         {
 905                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 906                 d_instantiate(dentry, inode);
 907                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 908                 error = 0;
 909         }
 910         else
 911         {
 912                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 913                 error = -ENOMEM;
 914         }
 915
 916         yaffs_GrossUnlock(dev);
 917
 918         return error;
 919 }
 920
 921 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 922 {
 923         int retVal;
 924         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 925         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 926 #if 0
 927  // attempt to fix dir bug - didn't work
 928         if(!retVal)
 929         {
 930                 dget(dentry);
 931         }
 932 #endif
 933         return retVal;
 934 }
 935
 936 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 937 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 938 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
 939 #else
 940 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 941 #endif
 942 {
 943         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
 944         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 945 }
 946
 947
 948 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 949 {
 950         int retVal;
 951
 952         yaffs_Device *dev;
 953
 954
 955         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
 956
 957         dev = yaffs_InodeToObject(dir)->myDev;
 958
 959         yaffs_GrossLock(dev);
 960
 961
 962         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
 963
 964
 965         yaffs_GrossUnlock(dev);
 966
 967         if( retVal == YAFFS_OK)
 968         {
 969                 dentry->d_inode->i_nlink--;
 970                 mark_inode_dirty(dentry->d_inode);
 971                 return 0;
 972         }
 973         else
 974         {
 975                 return -ENOTEMPTY;
 976         }
 977 }
 978
 979
 980 /*
 981  * Create a link...
 982  */
 983 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
 984 {
 985         struct inode *inode = old_dentry->d_inode;
 986         yaffs_Object *obj = NULL;
 987         yaffs_Object *link=NULL;
 988         yaffs_Device *dev;
 989
 990         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
 991
 992         obj = yaffs_InodeToObject(inode);
 993         dev = obj->myDev;
 994
 995         yaffs_GrossLock(dev);
 996
 997         if (!S_ISDIR(inode->i_mode))    // Don't link directories
 998         {
 999                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
1000         }
1001
1002
1003         if(link)
1004         {
1005                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
1006                 d_instantiate(dentry, old_dentry->d_inode);
1007                 atomic_inc(&old_dentry->d_inode->i_count);
1008                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
1009                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
1010
1011         }
1012
1013         yaffs_GrossUnlock(dev);
1014
1015
1016         if(link)
1017         {
1018
1019                 return 0;
1020         }
1021
1022
1023         return -EPERM;
1024 }
1025
1026
1027 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
1028 {
1029         yaffs_Object *obj;
1030         yaffs_Device *dev;
1031
1032         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
1033
1034         dev = yaffs_InodeToObject(dir)->myDev;
1035         yaffs_GrossLock(dev);
1036         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1037                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
1038                                                          symname);
1039         yaffs_GrossUnlock(dev);
1040
1041         if(obj)
1042         {
1043
1044                 struct inode* inode;
1045
1046                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode, 0, obj);
1047                 d_instantiate(dentry, inode);
1048                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
1049                 return 0;
1050         }
1051         else
1052         {
1053                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
1054
1055         }
1056
1057         return -ENOMEM;
1058 }
1059
1060 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
1061 {
1062
1063         yaffs_Object *obj;
1064         yaffs_Device *dev;
1065
1066         obj = yaffs_DentryToObject(dentry);
1067
1068         dev = obj->myDev;
1069
1070         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
1071         yaffs_GrossLock(dev);
1072         yaffs_FlushFile(obj,1);
1073         yaffs_GrossUnlock(dev);
1074         return 0;
1075 }
1076
1077 /*
1078  * The VFS layer already does all the dentry stuff for rename.
1079  *
1080  * NB: POSIX says you can rename an object over an old object of the same name
1081  */
1082 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1083 {
1084         yaffs_Device *dev;
1085         int retVal = YAFFS_FAIL;
1086         int removed = 0;
1087         yaffs_Object *target;
1088
1089         dev = yaffs_InodeToObject(old_dir)->myDev;
1090
1091         yaffs_GrossLock(dev);
1092
1093         // Check if the target is an existing directory that is not empty.
1094         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1095
1096         if(target &&
1097            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1098            !list_empty(&target->variant.directoryVariant.children))
1099         {
1100                 retVal = YAFFS_FAIL;
1101         }
1102         else
1103         {
1104
1105                 // Unlink the target if it exists
1106                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1107
1108
1109                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1110                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1111
1112         }
1113         yaffs_GrossUnlock(dev);
1114
1115         if(retVal == YAFFS_OK)
1116         {
1117                 if(removed == YAFFS_OK)
1118                 {
1119                         new_dentry->d_inode->i_nlink--;
1120                         mark_inode_dirty(new_dentry->d_inode);
1121                 }
1122
1123                 return 0;
1124         }
1125         else
1126         {
1127                 return -ENOTEMPTY;
1128         }
1129
1130
1131 }
1132
1133 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1134 {
1135         struct inode *inode = dentry->d_inode;
1136         int error;
1137         yaffs_Device *dev;
1138
1139         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1140
1141         if((error = inode_change_ok(inode,attr)) == 0)
1142         {
1143
1144                 dev = yaffs_InodeToObject(inode)->myDev;
1145                 yaffs_GrossLock(dev);
1146                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1147                 {
1148                         error = 0;
1149                 }
1150                 else
1151                 {
1152                         error = -EPERM;
1153                 }
1154                 yaffs_GrossUnlock(dev);
1155                 inode_setattr(inode,attr);
1156         }
1157         return error;
1158 }
1159
1160 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
1161 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1162 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1163 #else
1164 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1165 #endif
1166 {
1167         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1168         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1169
1170         yaffs_GrossLock(dev);
1171
1172         buf->f_type = YAFFS_MAGIC;
1173         buf->f_bsize = sb->s_blocksize;
1174         buf->f_namelen = 255;
1175         buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * YAFFS_CHUNKS_PER_BLOCK/
1176                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1177         buf->f_files = 0;
1178         buf->f_ffree = 0;
1179         buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1180                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1181         buf->f_bavail =  buf->f_bfree;
1182
1183         yaffs_GrossUnlock(dev);
1184         return 0;
1185 }
1186
1187 static void yaffs_read_inode (struct inode *inode)
1188 {
1189         // NB This is called as a side effect of other functions and
1190         // thus gross locking should always be in place already.
1191
1192         yaffs_Object *obj ;
1193         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1194
1195         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1196
1197         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1198
1199         yaffs_FillInodeFromObject(inode,obj);
1200
1201 }
1202
1203
1204
1205 static yaffs_Device *yaffs_dev;
1206 static yaffs_Device *yaffsram_dev;
1207
1208
1209
1210 static void yaffs_put_super(struct super_block *sb)
1211 {
1212         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1213
1214         yaffs_GrossLock(dev);
1215         if(dev->putSuperFunc)
1216         {
1217                  dev->putSuperFunc(sb);
1218         }
1219         yaffs_Deinitialise(dev);
1220         yaffs_GrossUnlock(dev);
1221
1222         if(dev == yaffs_dev) yaffs_dev = NULL;
1223         if(dev == yaffsram_dev) yaffsram_dev = NULL;
1224
1225         kfree(dev);
1226 }
1227
1228
1229 #ifdef CONFIG_YAFFS_MTD_ENABLED
1230
1231 static void  yaffs_MTDPutSuper(struct super_block *sb)
1232 {
1233
1234         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1235
1236         if(mtd->sync)
1237         {
1238                 mtd->sync(mtd);
1239         }
1240
1241         put_mtd_device(mtd);
1242 }
1243
1244 #endif
1245
1246
1247 static struct super_block *yaffs_internal_read_super(int useRam, struct super_block * sb, void * data, int silent)
1248 {
1249         int nBlocks;
1250         struct inode * inode;
1251         struct dentry * root;
1252         yaffs_Device *dev;
1253
1254         sb->s_magic = YAFFS_MAGIC;
1255         sb->s_op = &yaffs_super_ops;
1256
1257         if(!sb)
1258                 printk(KERN_INFO"yaffs: sb is NULL\n");
1259         else if(!sb->s_dev)
1260                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1261         else if(! kdevname(sb->s_dev))
1262                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1263         else
1264                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1265
1266
1267
1268 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1269         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1270         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1271 #else
1272         sb->s_blocksize = PAGE_CACHE_SIZE;
1273         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1274 #endif
1275         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1276
1277 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1278         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1279 #endif
1280
1281
1282
1283         if(useRam)
1284         {
1285
1286 #ifdef CONFIG_YAFFS_RAM_ENABLED
1287                 // Set the yaffs_Device up for ram emulation
1288
1289                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1290                 if(!dev)
1291                 {
1292                         // Deep shit could not allocate device structure
1293                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1294                         return NULL;
1295                 }
1296
1297                 memset(dev,0,sizeof(yaffs_Device));
1298                 dev->genericDevice = NULL; // Not used for RAM emulation.
1299
1300                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1301                 dev->startBlock = 1;  // Don't use block 0
1302                 dev->endBlock = nBlocks - 1;
1303                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1304                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1305                 dev->nReservedBlocks = 5;
1306
1307                 dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1308                 dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1309                 dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1310                 dev->initialiseNAND = nandemul_InitialiseNAND;
1311
1312                 yaffsram_dev = dev;
1313
1314 #endif
1315
1316         }
1317         else
1318         {
1319 #ifdef CONFIG_YAFFS_MTD_ENABLED
1320                 struct mtd_info *mtd;
1321
1322                 printk(KERN_DEBUG "yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1323                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev));
1324
1325                 // Check it's an mtd device.....
1326                 if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1327                 {
1328                         return NULL; // This isn't an mtd device
1329                 }
1330
1331                 // Get the device
1332                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1333                 if (!mtd)
1334                 {
1335                         printk(KERN_DEBUG "yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev));
1336                         return NULL;
1337                 }
1338
1339                 // Check it's NAND
1340                 if(mtd->type != MTD_NANDFLASH)
1341                 {
1342                         printk(KERN_DEBUG "yaffs: MTD device is not NAND it's type %d\n", mtd->type);
1343                         return NULL;
1344                 }
1345
1346                 //printk(KERN_DEBUG" erase %x\n",mtd->erase);
1347                 //printk(KERN_DEBUG" read %x\n",mtd->read);
1348                 //printk(KERN_DEBUG" write %x\n",mtd->write);
1349                 //printk(KERN_DEBUG" readoob %x\n",mtd->read_oob);
1350                 //printk(KERN_DEBUG" writeoob %x\n",mtd->write_oob);
1351                 //printk(KERN_DEBUG" oobblock %x\n",mtd->oobblock);
1352                 //printk(KERN_DEBUG" oobsize %x\n",mtd->oobsize);
1353
1354
1355                 if(!mtd->erase ||
1356                    !mtd->read  ||
1357                    !mtd->write ||
1358 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1359                    !mtd->write_ecc ||
1360                    !mtd->read_ecc ||
1361 #endif
1362                    !mtd->read_oob ||
1363                    !mtd->write_oob )
1364                 {
1365                         printk(KERN_DEBUG "yaffs: MTD device does not support required functions\n");
1366                         return NULL;
1367                 }
1368
1369                 if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1370                    mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1371                 {
1372                         printk(KERN_DEBUG "yaffs: MTD device does not support have the right page sizes\n");
1373                         return NULL;
1374                 }
1375
1376
1377                 // OK, so if we got here, we have an MTD that's NAND and looks
1378                 // like it has the right capabilities
1379                 // Set the yaffs_Device up for ram emulation
1380
1381 //#if defined(CONFIG_KERNEL_2_5)
1382 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1383                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1384 #else
1385                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1386 #endif
1387                 if(!dev)
1388                 {
1389                         // Deep shit could not allocate device structure
1390                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1391                         return NULL;
1392                 }
1393
1394                 memset(dev,0,sizeof(yaffs_Device));
1395                 dev->genericDevice = mtd;
1396
1397                 // Set up the memory size parameters....
1398
1399                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1400                 dev->startBlock = 1;  // Don't use block 0
1401                 dev->endBlock = nBlocks - 1;
1402                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1403                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1404                 dev->nReservedBlocks = 5;
1405                 dev->nShortOpCaches = 10; // Enable short op caching
1406
1407
1408                 // ... and the functions.
1409                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1410                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1411                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1412                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1413
1414                 dev->putSuperFunc = yaffs_MTDPutSuper;
1415
1416 #ifdef CONFIG_YAFFS_USE_NANDECC
1417                 dev->useNANDECC = 1;
1418 #endif
1419
1420                 yaffs_dev = dev;
1421
1422 #endif
1423         }
1424
1425         init_MUTEX(&dev->grossLock);
1426
1427
1428         yaffs_GrossLock(dev);
1429         yaffs_GutsInitialise(yaffs_SuperToDevice(sb));
1430
1431         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised\n"));
1432
1433         // Create root inode
1434         inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(yaffs_SuperToDevice(sb)));
1435
1436         yaffs_GrossUnlock(dev);
1437
1438         if (!inode)
1439                 return NULL;
1440
1441 // added NCB
1442         inode->i_op = & yaffs_dir_inode_operations;
1443         inode->i_fop = & yaffs_dir_operations;
1444
1445         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1446
1447
1448         root = d_alloc_root(inode);
1449
1450         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1451
1452         if (!root) {
1453                 iput(inode);
1454                 return NULL;
1455         }
1456         sb->s_root = root;
1457
1458         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1459         return sb;
1460 }
1461
1462 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1463 {
1464          return yaffs_internal_read_super(1,sb,data,silent) ? 0 : -1;
1465 }
1466 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1467 {
1468          return yaffs_internal_read_super(0,sb,data,silent) ? 0 : -1;
1469 }
1470
1471
1472 #ifdef CONFIG_YAFFS_MTD_ENABLED
1473 //#if defined(CONFIG_KERNEL_2_5)
1474 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1475 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1476 {
1477
1478     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1479 }
1480
1481 /* changes NCB 2.5.70 */
1482 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1483 static struct file_system_type yaffs_fs_type = {
1484         .owner          = THIS_MODULE,
1485         .name           = "yaffs",
1486         .get_sb         = yaffs_read_super,
1487 //      .kill_sb        = kill_block_super,
1488         .kill_sb        = kill_litter_super,
1489         .fs_flags       = FS_REQUIRES_DEV,
1490 };
1491 #else
1492 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1493 {
1494         return yaffs_internal_read_super(0,sb,data,silent);
1495 }
1496
1497 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1498 #endif
1499 #endif
1500
1501 #ifdef CONFIG_YAFFS_RAM_ENABLED
1502
1503 //#if defined(CONFIG_KERNEL_2_5)
1504 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1505 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1506 {
1507
1508     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_ram);
1509 }
1510
1511 /* changes NCB 2.5.70 */
1512 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1513 static struct file_system_type yaffs_fs_type = {
1514         .owner          = THIS_MODULE,
1515         .name           = "yaffsram",
1516         .get_sb         = yaffs_ram_read_super,
1517 //      .kill_sb        = kill_block_super,
1518         .kill_sb        = kill_litter_super,
1519         .fs_flags       = FS_SINGLE,
1520 };
1521 #else
1522 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1523 {
1524         return yaffs_internal_read_super(1,sb,data,silent);
1525 }
1526
1527 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1528 #endif
1529 #endif // CONFIG_YAFFS_RAM_ENABLED
1530
1531
1532 static struct proc_dir_entry *my_proc_entry;
1533 static struct proc_dir_entry *my_proc_ram_write_entry;
1534
1535 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
1536 {
1537         buf +=sprintf(buf,"\nDevice %s\n",name);
1538         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1539         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1540         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1541         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1542         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1543         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1544         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1545         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1546         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1547         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1548         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1549         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1550         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1551         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1552         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1553         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1554         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1555         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1556         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1557         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1558         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1559         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1560         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1561         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1562         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1563         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1564         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1565
1566
1567         return buf;
1568 }
1569
1570 static int  yaffs_proc_read(
1571         char *page,
1572         char **start,
1573         off_t offset,
1574         int count,
1575         int *eof,
1576         void *data
1577         )
1578 {
1579
1580         char my_buffer[3000];
1581         char *buf;
1582         buf = my_buffer;
1583
1584         if (offset > 0) return 0;
1585
1586         /* Fill the buffer and get its length */
1587         buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
1588
1589         if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
1590         if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
1591
1592
1593         strcpy(page,my_buffer);
1594         return strlen(my_buffer);
1595 }
1596
1597
1598 static int  yaffs_proc_ram_write(
1599         char *page,
1600         char **start,
1601         off_t offset,
1602         int count,
1603         int *eof,
1604         void *data
1605         )
1606 {
1607
1608         printk(KERN_DEBUG "yaffs write size %d\n",count);
1609         return count;
1610 }
1611
1612 static int __init init_yaffs_fs(void)
1613 {
1614         int error = 0;
1615
1616         yaffs_dev = yaffsram_dev = NULL;
1617
1618         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Initialisation\n");
1619 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
1620         printk(KERN_DEBUG "yaffs is using generic read/write (caching)\n");
1621 #else
1622         printk(KERN_DEBUG "yaffs is using direct read/write (uncached)\n");
1623 #endif
1624
1625
1626     /* Install the proc_fs entry */
1627     my_proc_entry = create_proc_read_entry("yaffs",
1628                                            S_IRUGO | S_IFREG,
1629                                            &proc_root,
1630                                            yaffs_proc_read,
1631                                            NULL);
1632     if(!my_proc_entry)
1633     {
1634        return -ENOMEM;
1635     }
1636
1637 #ifdef CONFIG_YAFFS_RAM_ENABLED
1638 #if 0
1639     my_proc_ram_write_entry = create_proc_entry("yaffs_ram",
1640                                            S_IRUGO | S_IFREG,
1641                                            &proc_root);
1642
1643     if(!my_proc_ram_write_entry)
1644     {
1645        return -ENOMEM;
1646     }
1647     else
1648     {
1649         my_proc_ram_write_entry->write_proc = yaffs_proc_ram_write;
1650     }
1651 #endif
1652
1653     error = register_filesystem(&yaffs_ram_fs_type);
1654     if(error)
1655     {
1656         return error;
1657     }
1658 #endif //CONFIG_YAFFS_RAM_ENABLED
1659
1660 #ifdef CONFIG_YAFFS_MTD_ENABLED
1661         error = register_filesystem(&yaffs_fs_type);
1662         if(error)
1663         {
1664 #ifdef CONFIG_YAFFS_RAM_ENABLED
1665                 unregister_filesystem(&yaffs_ram_fs_type);
1666 #endif //CONFIG_YAFFS_RAM_ENABLED
1667         }
1668 #endif // CONFIG_YAFFS_MTD_ENABLED
1669
1670         return error;
1671 }
1672
1673 static void __exit exit_yaffs_fs(void)
1674 {
1675         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Clean up\n");
1676
1677     remove_proc_entry("yaffs",&proc_root);
1678
1679 #ifdef CONFIG_YAFFS_RAM_ENABLED
1680         unregister_filesystem(&yaffs_ram_fs_type);
1681 #endif
1682 #ifdef CONFIG_YAFFS_MTD_ENABLED
1683         unregister_filesystem(&yaffs_fs_type);
1684 #endif
1685
1686 }
1687
1688 module_init(init_yaffs_fs)
1689 module_exit(exit_yaffs_fs)
1690
1691 MODULE_DESCRIPTION("YAFFS - a NAND specific flash file system");
1692 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002");
1693 MODULE_LICENSE("GPL");
1694