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 1.27 2003-08-16 08:17:32 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 defined(CONFIG_KERNEL_2_5)
  51 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  52 #include <asm/statfs.h>
  53 #define UnlockPage(p) unlock_page(p)
  54 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  55 #define kdevname(x) cdevname(to_kdev_t(x))
  56 #else
  57 #include <linux/locks.h>
  58 #endif
  59
  60
  61 #include <asm/uaccess.h>
  62
  63 #include "yportenv.h"
  64 #include "yaffs_guts.h"
  65
  66
  67
  68
  69 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
  70
  71 #ifdef CONFIG_YAFFS_RAM_ENABLED
  72 #include "yaffs_nandemul.h"
  73 // 2 MB of RAM for emulation
  74 #define YAFFS_RAM_EMULATION_SIZE  0x200000
  75 #endif //CONFIG_YAFFS_RAM_ENABLED
  76
  77 #ifdef CONFIG_YAFFS_MTD_ENABLED
  78 #include <linux/mtd/mtd.h>
  79 #include "yaffs_mtdif.h"
  80 #endif //CONFIG_YAFFS_MTD_ENABLED
  81
  82 //#define T(x) printk x
  83
  84
  85
  86 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
  87 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
  88 //NCB #define yaffs_SuperToDevice(sb)   ((yaffs_Device *)sb->u.generic_sbp)
  89
  90 #if defined(CONFIG_KERNEL_2_5)
  91 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
  92 #else
  93 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
  94 #endif
  95
  96
  97 static void yaffs_put_super(struct super_block *sb);
  98
  99 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos);
 100 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
 101 static int yaffs_file_flush(struct file* file);
 102
 103 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
 104
 105 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 106
 107 #if defined(CONFIG_KERNEL_2_5)  /* Added NCB 185-8-2003 */
 108 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n);
 109 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n);
 110 #else
 111 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 112 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
 113 #endif
 114 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
 115 static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
 116 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
 117 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
 118
 119 #if defined(CONFIG_KERNEL_2_5)
 120 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
 121 #else
 122 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
 123 #endif
 124 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
 125 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 126
 127 #if defined(CONFIG_KERNEL_2_5)  /* Added NCB 185-8-2003 */
 128 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 129 #else
 130 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 131 #endif
 132 static void yaffs_read_inode (struct inode *inode);
 133
 134 #if defined(CONFIG_KERNEL_2_5)
 135 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data);
 136 #else
 137 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent);
 138 #endif
 139
 140 static void yaffs_put_inode (struct inode *inode);
 141 static void yaffs_delete_inode(struct inode *);
 142 static void yaffs_clear_inode(struct inode *);
 143
 144 static int yaffs_readpage(struct file *file, struct page * page);
 145
 146 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 147 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 148
 149 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen);
 150 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 151
 152
 153
 154
 155 static struct address_space_operations yaffs_file_address_operations = {
 156         readpage:               yaffs_readpage,
 157         prepare_write:  yaffs_prepare_write,
 158         commit_write:   yaffs_commit_write
 159 };
 160
 161
 162 static struct file_operations yaffs_file_operations = {
 163 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
 164         read:           generic_file_read,
 165         write:          generic_file_write,
 166 #else
 167         read:           yaffs_file_read,
 168         write:          yaffs_file_write,
 169 #endif
 170         mmap:           generic_file_mmap,
 171         flush:          yaffs_file_flush,
 172         fsync:          yaffs_sync_object,
 173 };
 174
 175
 176 static struct inode_operations yaffs_file_inode_operations = {
 177         setattr:        yaffs_setattr,
 178 };
 179
 180
 181 struct inode_operations yaffs_symlink_inode_operations =
 182 {
 183         readlink:       yaffs_readlink,
 184         follow_link:    yaffs_follow_link,
 185         setattr:        yaffs_setattr
 186 };
 187
 188 static struct inode_operations yaffs_dir_inode_operations = {
 189         create:         yaffs_create,
 190         lookup:         yaffs_lookup,
 191         link:           yaffs_link,
 192         unlink:         yaffs_unlink,
 193         symlink:        yaffs_symlink,
 194         mkdir:          yaffs_mkdir,
 195         rmdir:          yaffs_unlink,
 196         mknod:          yaffs_mknod,
 197         rename:         yaffs_rename,
 198         setattr:        yaffs_setattr,
 199 };
 200
 201 static struct file_operations yaffs_dir_operations = {
 202         read:           generic_read_dir,
 203         readdir:        yaffs_readdir,
 204         fsync:          yaffs_sync_object,
 205 };
 206
 207
 208 static struct super_operations yaffs_super_ops = {
 209         statfs:                 yaffs_statfs,
 210         read_inode:             yaffs_read_inode,
 211         put_inode:              yaffs_put_inode,
 212         put_super:              yaffs_put_super,
 213 //      remount_fs:
 214         delete_inode:           yaffs_delete_inode,
 215         clear_inode:            yaffs_clear_inode,
 216 };
 217
 218
 219
 220 static void yaffs_GrossLock(yaffs_Device *dev)
 221 {
 222         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
 223
 224         down(&dev->grossLock);
 225 }
 226
 227 static void yaffs_GrossUnlock(yaffs_Device *dev)
 228 {
 229         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
 230         up(&dev->grossLock);
 231
 232 }
 233
 234 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen)
 235 {
 236         unsigned char *alias;
 237         int ret;
 238
 239         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 240
 241
 242         yaffs_GrossLock(dev);
 243
 244         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 245
 246         yaffs_GrossUnlock(dev);
 247
 248         if(!alias)
 249                 return -ENOMEM;
 250
 251         ret = vfs_readlink(dentry, buffer, buflen, alias);
 252         kfree(alias);
 253         return ret;
 254 }
 255
 256 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 257 {
 258         unsigned char *alias;
 259         int ret;
 260         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 261
 262
 263         yaffs_GrossLock(dev);
 264
 265         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 266
 267         yaffs_GrossUnlock(dev);
 268
 269         if(!alias)
 270                 return -ENOMEM;
 271
 272         ret = vfs_follow_link(nd,alias);
 273         kfree(alias);
 274         return ret;
 275 }
 276
 277
 278 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 279
 280 /*
 281  * Lookup is used to find objects in the fs
 282  */
 283 #if defined(CONFIG_KERNEL_2_5)  /* Added NCB 185-8-2003 */
 284 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 285 #else
 286 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 287 #endif
 288 {
 289         yaffs_Object *obj;
 290         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 291
 292         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 293
 294
 295         yaffs_GrossLock(dev);
 296
 297
 298         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 299
 300         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 301
 302         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 303
 304
 305
 306         if(obj)
 307         {
 308                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 309
 310                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode,0,obj);
 311
 312                 if(inode)
 313                 {
 314                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
 315 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 316 #if 0
 317                         //dget(dentry); // try to solve directory bug
 318                         d_add(dentry,inode);
 319
 320                         yaffs_GrossUnlock(dev);
 321
 322                         // return dentry;
 323                         return NULL;
 324 #endif
 325                 }
 326
 327         }
 328         else
 329         {
 330                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
 331
 332         }
 333         yaffs_GrossUnlock(dev);
 334
 335 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 336         d_add(dentry,inode);
 337
 338         return NULL;
 339         //      return (ERR_PTR(-EIO));
 340
 341 }
 342
 343 // For now put inode is just for debugging
 344 // Put inode is called when the inode **structure** is put.
 345 static void yaffs_put_inode(struct inode *inode)
 346 {
 347         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 348
 349 }
 350
 351 // clear is called to tell the fs to release any per-inode data it holds
 352 static void yaffs_clear_inode(struct inode *inode)
 353 {
 354         yaffs_Object *obj = yaffs_InodeToObject(inode);
 355
 356         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 357                 obj ? "object exists" : "null object"));
 358
 359         if(obj)
 360         {
 361                 obj->myInode = NULL;
 362                 inode->u.generic_ip = NULL;
 363         }
 364
 365
 366 }
 367
 368 // delete is called when the link count is zero and the inode
 369 // is put (ie. nobody wants to know about it anymore, time to
 370 // delete the file).
 371 // NB Must call clear_inode()
 372 static void yaffs_delete_inode(struct inode *inode)
 373 {
 374         yaffs_Object *obj = yaffs_InodeToObject(inode);
 375         yaffs_Device *dev;
 376
 377         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 378                 obj ? "object exists" : "null object"));
 379
 380         if(obj)
 381         {
 382                 dev = obj->myDev;
 383                 yaffs_GrossLock(dev);
 384                 yaffs_DeleteFile(obj);
 385                 yaffs_GrossUnlock(dev);
 386         }
 387         clear_inode(inode);
 388 }
 389
 390
 391 static int yaffs_file_flush(struct file* file)
 392 {
 393         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 394
 395         yaffs_Device *dev = obj->myDev;
 396
 397         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 398                                 obj->dirty ? "dirty" : "clean"));
 399
 400         yaffs_GrossLock(dev);
 401
 402     yaffs_FlushFile(obj,1);
 403
 404         yaffs_GrossUnlock(dev);
 405
 406     return 0;
 407 }
 408
 409
 410
 411 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 412 {
 413         // Lifted from jffs2
 414
 415         yaffs_Object *obj;
 416         unsigned char *pg_buf;
 417         int ret;
 418
 419         yaffs_Device *dev;
 420
 421         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 422                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 423
 424         obj  = yaffs_DentryToObject(f->f_dentry);
 425
 426         dev = obj->myDev;
 427
 428
 429         if (!PageLocked(pg))
 430                 PAGE_BUG(pg);
 431
 432         pg_buf = kmap(pg);
 433         /* FIXME: Can kmap fail? */
 434
 435         yaffs_GrossLock(dev);
 436
 437         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 438
 439         yaffs_GrossUnlock(dev);
 440
 441         if(ret >= 0) ret = 0;
 442
 443         if (ret) {
 444                 ClearPageUptodate(pg);
 445                 SetPageError(pg);
 446         } else {
 447                 SetPageUptodate(pg);
 448                 ClearPageError(pg);
 449         }
 450
 451         flush_dcache_page(pg);
 452         kunmap(pg);
 453
 454
 455         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
 456         return ret;
 457 }
 458
 459 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 460 {
 461         int ret = yaffs_readpage_nolock(f,pg);
 462         UnlockPage(pg);
 463         return ret;
 464 }
 465
 466 static int yaffs_readpage(struct file *f, struct page * pg)
 467 {
 468         return yaffs_readpage_unlock(f,pg);
 469 }
 470
 471
 472 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 473 {
 474
 475         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
 476         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 477                 return  yaffs_readpage_nolock(f,pg);
 478
 479         return 0;
 480
 481 }
 482
 483 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 484 {
 485
 486         void *addr = page_address(pg) + offset;
 487         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 488         int nBytes = to - offset;
 489         int nWritten;
 490
 491         unsigned spos = pos;
 492         unsigned saddr = (unsigned)addr;
 493
 494         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 495
 496         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 497
 498         if(nWritten != nBytes)
 499         {
 500                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 501                 SetPageError(pg);
 502                 ClearPageUptodate(pg);
 503         }
 504         else
 505         {
 506                 SetPageUptodate(pg);
 507         }
 508
 509         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 510
 511         return nWritten;
 512
 513 }
 514
 515
 516
 517 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 518 {
 519         if (inode && obj)
 520         {
 521                 inode->i_ino = obj->objectId;
 522                 inode->i_mode = obj->st_mode;
 523                 inode->i_uid = obj->st_uid;
 524                 inode->i_gid = obj->st_gid;
 525                 inode->i_blksize = inode->i_sb->s_blocksize;
 526                 inode->i_blocks = 0;
 527 #if defined(CONFIG_KERNEL_2_5)
 528                 inode->i_rdev = to_kdev_t(obj->st_rdev);
 529                 inode->i_atime.tv_sec = (time_t)(obj->st_atime);
 530                 inode->i_atime.tv_nsec = 0;
 531                 inode->i_mtime.tv_sec = (time_t)obj->st_mtime;
 532                 inode->i_mtime.tv_nsec =0;
 533                 inode->i_ctime.tv_sec = (time_t)obj->st_ctime;
 534                 inode->i_ctime.tv_nsec = 0;
 535 #else
 536                 inode->i_rdev = obj->st_rdev;
 537                 inode->i_atime = obj->st_atime;
 538                 inode->i_mtime = obj->st_mtime;
 539                 inode->i_ctime = obj->st_ctime;
 540 #endif
 541                 inode->i_size = yaffs_GetObjectFileLength(obj);
 542                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 543
 544                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 545                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 546
 547                 switch (obj->st_mode & S_IFMT)
 548                 {
 549                         default: // fifo, device or socket
 550                                 init_special_inode(inode, obj->st_mode,(dev_t)(obj->st_rdev));
 551                                 break;
 552                         case S_IFREG:   // file
 553                                 inode->i_op = &yaffs_file_inode_operations;
 554                                 inode->i_fop = &yaffs_file_operations;
 555                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 556                                 break;
 557                         case S_IFDIR:   // directory
 558                                 inode->i_op = &yaffs_dir_inode_operations;
 559                                 inode->i_fop = &yaffs_dir_operations;
 560                                 break;
 561                         case S_IFLNK:   // symlink
 562                                 inode->i_op = &yaffs_symlink_inode_operations;
 563                                 break;
 564                 }
 565
 566
 567                 inode->u.generic_ip = obj;
 568                 obj->myInode = inode;
 569
 570         }
 571         else
 572         {
 573                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 574         }
 575
 576 }
 577
 578 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 579 {
 580         struct inode * inode;
 581
 582         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 583
 584         inode = iget(sb,obj->objectId);
 585
 586         // NB Side effect: iget calls back to yaffs_read_inode().
 587         // iget also increments the inode's i_count
 588
 589         return inode;
 590 }
 591
 592 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 593 {
 594         yaffs_Object *obj;
 595         int nRead,ipos;
 596         struct inode *inode;
 597         yaffs_Device *dev;
 598
 599         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n"));
 600
 601         obj  = yaffs_DentryToObject(f->f_dentry);
 602
 603         dev = obj->myDev;
 604
 605         yaffs_GrossLock(dev);
 606
 607         inode = f->f_dentry->d_inode;
 608
 609         if (*pos < inode->i_size)
 610         {
 611                         if (*pos + n > inode->i_size)
 612                         {
 613                                 n = inode->i_size - *pos;
 614                         }
 615         }
 616         else
 617         {
 618                 n = 0;
 619         }
 620
 621         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 622         if(nRead > 0)
 623         {
 624                 f->f_pos += nRead;
 625         }
 626
 627         yaffs_GrossUnlock(dev);
 628
 629         ipos = *pos;
 630
 631         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 632         return nRead;
 633
 634 }
 635
 636
 637 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 638 {
 639         yaffs_Object *obj;
 640         int nWritten,ipos;
 641         struct inode *inode;
 642         yaffs_Device *dev;
 643
 644
 645         obj  = yaffs_DentryToObject(f->f_dentry);
 646
 647         dev = obj->myDev;
 648
 649         yaffs_GrossLock(dev);
 650
 651         inode = f->f_dentry->d_inode;
 652
 653         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 654         {
 655                 ipos = inode->i_size;
 656         }
 657         else
 658         {
 659                 ipos = *pos;
 660         }
 661
 662
 663         if(!obj)
 664         {
 665                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 666         }
 667         else
 668         {
 669                 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));
 670         }
 671
 672         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n);
 673
 674         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 675         if(nWritten > 0)
 676         {
 677                 ipos += nWritten;
 678                 *pos = ipos;
 679                 if(ipos > inode->i_size)
 680                 {
 681                         inode->i_size = ipos;
 682                         inode->i_blocks = (ipos + inode->i_blksize - 1)/ inode->i_blksize;
 683
 684                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 685                 }
 686
 687         }
 688         yaffs_GrossUnlock(dev);
 689
 690         return nWritten != n ? -ENOSPC : nWritten;
 691 }
 692
 693
 694 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 695 {
 696         yaffs_Object *obj;
 697         yaffs_Device *dev;
 698         struct inode *inode = f->f_dentry->d_inode;
 699         unsigned long offset, curoffs;
 700         struct list_head *i;
 701         yaffs_Object *l;
 702
 703         char name[YAFFS_MAX_NAME_LENGTH +1];
 704
 705         obj =  yaffs_DentryToObject(f->f_dentry);
 706         dev = obj->myDev;
 707
 708         yaffs_GrossLock(dev);
 709
 710         offset = f->f_pos;
 711
 712         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 713
 714         if(offset == 0)
 715         {
 716         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 717                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 718                 {
 719                         goto out;
 720                 }
 721                 offset++;
 722                 f->f_pos++;
 723         }
 724         if(offset == 1)
 725         {
 726                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 727                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 728                 {
 729                         goto out;
 730                 }
 731                 offset++;
 732                 f->f_pos++;
 733         }
 734
 735         curoffs = 1;
 736
 737         list_for_each(i,&obj->variant.directoryVariant.children)
 738         {
 739                 curoffs++;
 740                 if(curoffs >= offset)
 741                 {
 742                         l = list_entry(i, yaffs_Object,siblings);
 743
 744                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 745                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 746
 747                         if(filldir(dirent,
 748                                            name,
 749                                            strlen(name),
 750                                            offset,
 751                                            yaffs_GetObjectInode(l),
 752                                            yaffs_GetObjectType(l))
 753                                            < 0)
 754                         {
 755                                 goto up_and_out;
 756                         }
 757
 758                         offset++;
 759                         f->f_pos++;
 760                 }
 761         }
 762
 763   up_and_out:
 764   out:
 765
 766     yaffs_GrossUnlock(dev);
 767
 768         return 0;
 769 }
 770
 771
 772 /*
 773  * File creation. Allocate an inode, and we're done..
 774  */
 775 #if defined(CONFIG_KERNEL_2_5)
 776 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 777 #else
 778 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 779 #endif
 780 {
 781         struct inode *inode;
 782
 783         yaffs_Object *obj = NULL;
 784         yaffs_Device *dev;
 785
 786         yaffs_Object *parent = yaffs_InodeToObject(dir);
 787
 788         int error = -ENOSPC;
 789
 790         if(parent)
 791         {
 792                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 793                                          parent->objectId,parent->variantType));
 794         }
 795         else
 796         {
 797                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 798                 return -EPERM;
 799         }
 800
 801         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 802                                         dentry->d_name.name, mode,rdev));
 803
 804         dev = parent->myDev;
 805
 806         yaffs_GrossLock(dev);
 807
 808         switch (mode & S_IFMT)
 809         {
 810                 default:
 811                         // Special (socket, fifo, device...)
 812                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 813                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 814                         break;
 815                 case S_IFREG:   // file
 816                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 817                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 818                         break;
 819                 case S_IFDIR:   // directory
 820                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 821                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 822                         break;
 823                 case S_IFLNK:   // symlink
 824                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 825                         obj = NULL; // Do we ever get here?
 826                         break;
 827         }
 828
 829         if(obj)
 830         {
 831                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 832                 d_instantiate(dentry, inode);
 833                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 834                 error = 0;
 835         }
 836         else
 837         {
 838                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 839                 error = -ENOMEM;
 840         }
 841
 842         yaffs_GrossUnlock(dev);
 843
 844         return error;
 845 }
 846
 847 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 848 {
 849         int retVal;
 850         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 851         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 852 #if 0
 853  // attempt to fix dir bug - didn't work
 854         if(!retVal)
 855         {
 856                 dget(dentry);
 857         }
 858 #endif
 859         return retVal;
 860 }
 861
 862 #if defined(CONFIG_KERNEL_2_5)  /* Added NCB 185-8-2003 */
 863 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
 864 #else
 865 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 866 #endif
 867 {
 868         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
 869         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 870 }
 871
 872
 873 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 874 {
 875         int retVal;
 876
 877         yaffs_Device *dev;
 878
 879
 880         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
 881
 882         dev = yaffs_InodeToObject(dir)->myDev;
 883
 884         yaffs_GrossLock(dev);
 885
 886
 887         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
 888
 889
 890         yaffs_GrossUnlock(dev);
 891
 892         if( retVal == YAFFS_OK)
 893         {
 894                 dentry->d_inode->i_nlink--;
 895                 mark_inode_dirty(dentry->d_inode);
 896                 return 0;
 897         }
 898         else
 899         {
 900                 return -ENOTEMPTY;
 901         }
 902 }
 903
 904
 905 /*
 906  * Create a link...
 907  */
 908 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
 909 {
 910         struct inode *inode = old_dentry->d_inode;
 911         yaffs_Object *obj = NULL;
 912         yaffs_Object *link=NULL;
 913         yaffs_Device *dev;
 914
 915         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
 916
 917         obj = yaffs_InodeToObject(inode);
 918         dev = obj->myDev;
 919
 920         yaffs_GrossLock(dev);
 921
 922         if (!S_ISDIR(inode->i_mode))    // Don't link directories
 923         {
 924                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
 925         }
 926
 927
 928         if(link)
 929         {
 930                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
 931                 d_instantiate(dentry, old_dentry->d_inode);
 932                 atomic_inc(&old_dentry->d_inode->i_count);
 933                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
 934                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
 935
 936         }
 937
 938         yaffs_GrossUnlock(dev);
 939
 940
 941         if(link)
 942         {
 943
 944                 return 0;
 945         }
 946
 947
 948         return -EPERM;
 949 }
 950
 951
 952 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
 953 {
 954         yaffs_Object *obj;
 955         yaffs_Device *dev;
 956
 957         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
 958
 959         dev = yaffs_InodeToObject(dir)->myDev;
 960         yaffs_GrossLock(dev);
 961         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
 962                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
 963                                                          symname);
 964         yaffs_GrossUnlock(dev);
 965
 966         if(obj)
 967         {
 968
 969                 struct inode* inode;
 970
 971                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode, 0, obj);
 972                 d_instantiate(dentry, inode);
 973                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
 974                 return 0;
 975         }
 976         else
 977         {
 978                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
 979
 980         }
 981
 982         return -ENOMEM;
 983 }
 984
 985 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
 986 {
 987
 988         yaffs_Object *obj;
 989         yaffs_Device *dev;
 990
 991         obj = yaffs_DentryToObject(dentry);
 992
 993         dev = obj->myDev;
 994
 995         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
 996         yaffs_GrossLock(dev);
 997         yaffs_FlushFile(obj,1);
 998         yaffs_GrossUnlock(dev);
 999         return 0;
1000 }
1001
1002 /*
1003  * The VFS layer already does all the dentry stuff for rename.
1004  *
1005  * NB: POSIX says you can rename an object over an old object of the same name
1006  */
1007 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1008 {
1009         yaffs_Device *dev;
1010         int retVal = YAFFS_FAIL;
1011         int removed = 0;
1012         yaffs_Object *target;
1013
1014         dev = yaffs_InodeToObject(old_dir)->myDev;
1015
1016         yaffs_GrossLock(dev);
1017
1018         // Check if the target is an existing directory that is not empty.
1019         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1020
1021         if(target &&
1022            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1023            !list_empty(&target->variant.directoryVariant.children))
1024         {
1025                 retVal = YAFFS_FAIL;
1026         }
1027         else
1028         {
1029
1030                 // Unlink the target if it exists
1031                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1032
1033
1034                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1035                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1036
1037         }
1038         yaffs_GrossUnlock(dev);
1039
1040         if(retVal == YAFFS_OK)
1041         {
1042                 if(removed == YAFFS_OK)
1043                 {
1044                         new_dentry->d_inode->i_nlink--;
1045                         mark_inode_dirty(new_dentry->d_inode);
1046                 }
1047
1048                 return 0;
1049         }
1050         else
1051         {
1052                 return -ENOTEMPTY;
1053         }
1054
1055
1056 }
1057
1058 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1059 {
1060         struct inode *inode = dentry->d_inode;
1061         int error;
1062         yaffs_Device *dev;
1063
1064         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1065
1066         if((error = inode_change_ok(inode,attr)) == 0)
1067         {
1068
1069                 dev = yaffs_InodeToObject(inode)->myDev;
1070                 yaffs_GrossLock(dev);
1071                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1072                 {
1073                         error = 0;
1074                 }
1075                 else
1076                 {
1077                         error = -EPERM;
1078                 }
1079                 yaffs_GrossUnlock(dev);
1080                 inode_setattr(inode,attr);
1081         }
1082         return error;
1083 }
1084
1085 #if defined(CONFIG_KERNEL_2_5)  /* Added NCB 185-8-2003 */
1086 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1087 #else
1088 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1089 #endif
1090 {
1091         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1092         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1093
1094         yaffs_GrossLock(dev);
1095
1096         buf->f_type = YAFFS_MAGIC;
1097         buf->f_bsize = sb->s_blocksize;
1098         buf->f_namelen = 255;
1099         buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * YAFFS_CHUNKS_PER_BLOCK/
1100                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1101         buf->f_files = 0;
1102         buf->f_ffree = 0;
1103         buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1104                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1105         buf->f_bavail =  buf->f_bfree;
1106
1107         yaffs_GrossUnlock(dev);
1108         return 0;
1109 }
1110
1111 static void yaffs_read_inode (struct inode *inode)
1112 {
1113         // NB This is called as a side effect of other functions and
1114         // thus gross locking should always be in place already.
1115
1116         yaffs_Object *obj ;
1117         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1118
1119         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1120
1121         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1122
1123         yaffs_FillInodeFromObject(inode,obj);
1124
1125 }
1126
1127
1128
1129 static yaffs_Device *yaffs_dev;
1130 static yaffs_Device *yaffsram_dev;
1131
1132
1133
1134 static void yaffs_put_super(struct super_block *sb)
1135 {
1136         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1137
1138         yaffs_GrossLock(dev);
1139         if(dev->putSuperFunc)
1140         {
1141                  dev->putSuperFunc(sb);
1142         }
1143         yaffs_Deinitialise(dev);
1144         yaffs_GrossUnlock(dev);
1145
1146         if(dev == yaffs_dev) yaffs_dev = NULL;
1147         if(dev == yaffsram_dev) yaffsram_dev = NULL;
1148
1149         kfree(dev);
1150 }
1151
1152
1153 #ifdef CONFIG_YAFFS_MTD_ENABLED
1154
1155 static void  yaffs_MTDPutSuper(struct super_block *sb)
1156 {
1157
1158         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1159
1160         if(mtd->sync)
1161         {
1162                 mtd->sync(mtd);
1163         }
1164
1165         put_mtd_device(mtd);
1166 }
1167
1168 #endif
1169
1170
1171 static struct super_block *yaffs_internal_read_super(int useRam, struct super_block * sb, void * data, int silent)
1172 {
1173         int nBlocks;
1174         struct inode * inode;
1175         struct dentry * root;
1176         yaffs_Device *dev;
1177
1178         sb->s_magic = YAFFS_MAGIC;
1179         sb->s_op = &yaffs_super_ops;
1180
1181         if(!sb)
1182                 printk(KERN_INFO"yaffs: sb is NULL\n");
1183         else if(!sb->s_dev)
1184                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1185         else if(! kdevname(sb->s_dev))
1186                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1187         else
1188                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1189
1190
1191
1192 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1193         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1194         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1195 #else
1196         sb->s_blocksize = PAGE_CACHE_SIZE;
1197         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1198 #endif
1199         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1200
1201 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1202         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1203 #endif
1204
1205
1206
1207         if(useRam)
1208         {
1209
1210 #ifdef CONFIG_YAFFS_RAM_ENABLED
1211                 // Set the yaffs_Device up for ram emulation
1212
1213                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1214                 if(!dev)
1215                 {
1216                         // Deep shit could not allocate device structure
1217                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1218                         return NULL;
1219                 }
1220
1221                 memset(dev,0,sizeof(yaffs_Device));
1222                 dev->genericDevice = NULL; // Not used for RAM emulation.
1223
1224                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1225                 dev->startBlock = 1;  // Don't use block 0
1226                 dev->endBlock = nBlocks - 1;
1227                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1228                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1229                 dev->nReservedBlocks = 5;
1230
1231                 dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1232                 dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1233                 dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1234                 dev->initialiseNAND = nandemul_InitialiseNAND;
1235
1236                 yaffsram_dev = dev;
1237
1238 #endif
1239
1240         }
1241         else
1242         {
1243 #ifdef CONFIG_YAFFS_MTD_ENABLED
1244                 struct mtd_info *mtd;
1245
1246                 printk(KERN_DEBUG "yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1247                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev));
1248
1249                 // Hope it's a NAND mtd
1250                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1251                 if (!mtd)
1252                 {
1253                         printk(KERN_DEBUG "yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev));
1254                         return NULL;
1255                 }
1256
1257                 if(mtd->type != MTD_NANDFLASH)
1258                 {
1259                         printk(KERN_DEBUG "yaffs: MTD device is not NAND it's type %d\n", mtd->type);
1260                         return NULL;
1261                 }
1262
1263                 //printk(KERN_DEBUG" erase %x\n",mtd->erase);
1264                 //printk(KERN_DEBUG" read %x\n",mtd->read);
1265                 //printk(KERN_DEBUG" write %x\n",mtd->write);
1266                 //printk(KERN_DEBUG" readoob %x\n",mtd->read_oob);
1267                 //printk(KERN_DEBUG" writeoob %x\n",mtd->write_oob);
1268                 //printk(KERN_DEBUG" oobblock %x\n",mtd->oobblock);
1269                 //printk(KERN_DEBUG" oobsize %x\n",mtd->oobsize);
1270
1271
1272                 if(!mtd->erase ||
1273                    !mtd->read  ||
1274                    !mtd->write ||
1275 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1276                    !mtd->write_ecc ||
1277                    !mtd->read_ecc ||
1278 #endif
1279                    !mtd->read_oob ||
1280                    !mtd->write_oob )
1281                 {
1282                         printk(KERN_DEBUG "yaffs: MTD device does not support required functions\n");
1283                         return NULL;
1284                 }
1285
1286                 if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1287                    mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1288                 {
1289                         printk(KERN_DEBUG "yaffs: MTD device does not support have the right page sizes\n");
1290                         return NULL;
1291                 }
1292
1293
1294                 // OK, so if we got here, we have an MTD that's NAND and looks
1295                 // like it has the right capabilities
1296                 // Set the yaffs_Device up for ram emulation
1297
1298 #if defined(CONFIG_KERNEL_2_5)
1299                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1300 #else
1301                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1302 #endif
1303                 if(!dev)
1304                 {
1305                         // Deep shit could not allocate device structure
1306                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1307                         return NULL;
1308                 }
1309
1310                 memset(dev,0,sizeof(yaffs_Device));
1311                 dev->genericDevice = mtd;
1312
1313                 // Set up the memory size parameters....
1314
1315                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1316                 dev->startBlock = 1;  // Don't use block 0
1317                 dev->endBlock = nBlocks - 1;
1318                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1319                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1320                 dev->nReservedBlocks = 5;
1321                 dev->nShortOpCaches = 10; // Enable short op caching
1322
1323
1324                 // ... and the functions.
1325                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1326                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1327                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1328                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1329
1330                 dev->putSuperFunc = yaffs_MTDPutSuper;
1331
1332 #ifdef CONFIG_YAFFS_USE_NANDECC
1333                 dev->useNANDECC = 1;
1334 #endif
1335
1336                 yaffs_dev = dev;
1337
1338 #endif
1339         }
1340
1341         init_MUTEX(&dev->grossLock);
1342
1343
1344         yaffs_GrossLock(dev);
1345         yaffs_GutsInitialise(yaffs_SuperToDevice(sb));
1346
1347         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised\n"));
1348
1349         // Create root inode
1350         inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(yaffs_SuperToDevice(sb)));
1351
1352         yaffs_GrossUnlock(dev);
1353
1354         if (!inode)
1355                 return NULL;
1356
1357 // added NCB
1358         inode->i_op = & yaffs_dir_inode_operations;
1359         inode->i_fop = & yaffs_dir_operations;
1360
1361         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1362
1363
1364         root = d_alloc_root(inode);
1365
1366         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1367
1368         if (!root) {
1369                 iput(inode);
1370                 return NULL;
1371         }
1372         sb->s_root = root;
1373
1374         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1375         return sb;
1376 }
1377
1378 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1379 {
1380          return yaffs_internal_read_super(1,sb,data,silent) ? 0 : -1;
1381 }
1382 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1383 {
1384          return yaffs_internal_read_super(0,sb,data,silent) ? 0 : -1;
1385 }
1386
1387
1388 #ifdef CONFIG_YAFFS_MTD_ENABLED
1389 #if defined(CONFIG_KERNEL_2_5)
1390 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1391 {
1392
1393     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1394 }
1395
1396 /* changes NCB 2.5.70 */
1397 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1398 static struct file_system_type yaffs_fs_type = {
1399         .owner          = THIS_MODULE,
1400         .name           = "yaffs",
1401         .get_sb         = yaffs_read_super,
1402 //      .kill_sb        = kill_block_super,
1403         .kill_sb        = kill_litter_super,
1404         .fs_flags       = FS_REQUIRES_DEV,
1405 };
1406 #else
1407 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1408 {
1409         return yaffs_internal_read_super(0,sb,data,silent);
1410 }
1411
1412 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1413 #endif
1414 #endif
1415
1416 #ifdef CONFIG_YAFFS_RAM_ENABLED
1417
1418 #if defined(CONFIG_KERNEL_2_5)
1419 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1420 {
1421
1422     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_ram);
1423 }
1424
1425 /* changes NCB 2.5.70 */
1426 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1427 static struct file_system_type yaffs_fs_type = {
1428         .owner          = THIS_MODULE,
1429         .name           = "yaffsram",
1430         .get_sb         = yaffs_ram_read_super,
1431 //      .kill_sb        = kill_block_super,
1432         .kill_sb        = kill_litter_super,
1433         .fs_flags       = FS_SINGLE,
1434 };
1435 #else
1436 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1437 {
1438         return yaffs_internal_read_super(1,sb,data,silent);
1439 }
1440
1441 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1442 #endif
1443 #endif // CONFIG_YAFFS_RAM_ENABLED
1444
1445
1446 static struct proc_dir_entry *my_proc_entry;
1447 static struct proc_dir_entry *my_proc_ram_write_entry;
1448
1449 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
1450 {
1451         buf +=sprintf(buf,"\nDevice %s\n",name);
1452         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1453         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1454         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1455         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1456         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1457         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1458         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1459         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1460         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1461         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1462         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1463         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1464         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1465         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1466         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1467         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1468         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1469         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1470         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1471         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1472         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1473         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1474         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1475         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1476         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1477         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1478         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1479
1480
1481         return buf;
1482 }
1483
1484 static int  yaffs_proc_read(
1485         char *page,
1486         char **start,
1487         off_t offset,
1488         int count,
1489         int *eof,
1490         void *data
1491         )
1492 {
1493
1494         char my_buffer[3000];
1495         char *buf;
1496         buf = my_buffer;
1497
1498         if (offset > 0) return 0;
1499
1500         /* Fill the buffer and get its length */
1501         buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
1502
1503         if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
1504         if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
1505
1506
1507         strcpy(page,my_buffer);
1508         return strlen(my_buffer);
1509 }
1510
1511
1512 static int  yaffs_proc_ram_write(
1513         char *page,
1514         char **start,
1515         off_t offset,
1516         int count,
1517         int *eof,
1518         void *data
1519         )
1520 {
1521
1522         printk(KERN_DEBUG "yaffs write size %d\n",count);
1523         return count;
1524 }
1525
1526 static int __init init_yaffs_fs(void)
1527 {
1528         int error = 0;
1529
1530         yaffs_dev = yaffsram_dev = NULL;
1531
1532         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Initialisation\n");
1533 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
1534         printk(KERN_DEBUG "yaffs is using generic read/write (caching)\n");
1535 #else
1536         printk(KERN_DEBUG "yaffs is using direct read/write (uncached)\n");
1537 #endif
1538
1539
1540     /* Install the proc_fs entry */
1541     my_proc_entry = create_proc_read_entry("yaffs",
1542                                            S_IRUGO | S_IFREG,
1543                                            &proc_root,
1544                                            yaffs_proc_read,
1545                                            NULL);
1546     if(!my_proc_entry)
1547     {
1548        return -ENOMEM;
1549     }
1550
1551 #ifdef CONFIG_YAFFS_RAM_ENABLED
1552 #if 0
1553     my_proc_ram_write_entry = create_proc_entry("yaffs_ram",
1554                                            S_IRUGO | S_IFREG,
1555                                            &proc_root);
1556
1557     if(!my_proc_ram_write_entry)
1558     {
1559        return -ENOMEM;
1560     }
1561     else
1562     {
1563         my_proc_ram_write_entry->write_proc = yaffs_proc_ram_write;
1564     }
1565 #endif
1566
1567     error = register_filesystem(&yaffs_ram_fs_type);
1568     if(error)
1569     {
1570         return error;
1571     }
1572 #endif //CONFIG_YAFFS_RAM_ENABLED
1573
1574 #ifdef CONFIG_YAFFS_MTD_ENABLED
1575         error = register_filesystem(&yaffs_fs_type);
1576         if(error)
1577         {
1578 #ifdef CONFIG_YAFFS_RAM_ENABLED
1579                 unregister_filesystem(&yaffs_ram_fs_type);
1580 #endif //CONFIG_YAFFS_RAM_ENABLED
1581         }
1582 #endif // CONFIG_YAFFS_MTD_ENABLED
1583
1584         return error;
1585 }
1586
1587 static void __exit exit_yaffs_fs(void)
1588 {
1589         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Clean up\n");
1590
1591     remove_proc_entry("yaffs",&proc_root);
1592
1593 #ifdef CONFIG_YAFFS_RAM_ENABLED
1594         unregister_filesystem(&yaffs_ram_fs_type);
1595 #endif
1596 #ifdef CONFIG_YAFFS_MTD_ENABLED
1597         unregister_filesystem(&yaffs_fs_type);
1598 #endif
1599
1600 }
1601
1602 module_init(init_yaffs_fs)
1603 module_exit(exit_yaffs_fs)
1604
1605 MODULE_DESCRIPTION("YAFFS - a NAND specific flash file system");
1606 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002");
1607 MODULE_LICENSE("GPL");
1608