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  * * Michael Fischer for finding the problem with inode inconsistency.
  28  * * Some code bodily lifted from JFFS2.
  29  */
  30
  31
  32 const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.37 2005-01-06 23:28:34 charles Exp $";
  33 extern const char *yaffs_guts_c_version;
  34
  35
  36 #include <linux/config.h>
  37 #include <linux/kernel.h>
  38 #include <linux/module.h>
  39 #include <linux/version.h>
  40 #include <linux/slab.h>
  41 #include <linux/init.h>
  42 #include <linux/list.h>
  43 #include <linux/fs.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/pagemap.h>
  46 #include <linux/mtd/mtd.h>
  47 #include <linux/interrupt.h>
  48 #include <linux/string.h>
  49
  50
  51 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  52
  53 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  54 #include <asm/statfs.h>
  55 #define UnlockPage(p) unlock_page(p)
  56 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  57 //#define kdevname(x) cdevname(to_kdev_t(x))
  58 #define kdevname(x) "(unavailable)"     // temporary fix
  59
  60 #else
  61
  62 #include <linux/locks.h>
  63
  64 #endif
  65
  66
  67 #include <asm/uaccess.h>
  68
  69 #include "yportenv.h"
  70 #include "yaffs_guts.h"
  71
  72
  73
  74
  75 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
  76
  77 #ifdef CONFIG_YAFFS_RAM_ENABLED
  78 #include "yaffs_nandemul.h"
  79 // 2 MB of RAM for emulation
  80 #define YAFFS_RAM_EMULATION_SIZE  0x200000
  81 #endif //CONFIG_YAFFS_RAM_ENABLED
  82
  83 #ifdef CONFIG_YAFFS_MTD_ENABLED
  84 #include <linux/mtd/mtd.h>
  85 #include "yaffs_mtdif.h"
  86 #endif //CONFIG_YAFFS_MTD_ENABLED
  87
  88 //#define T(x) printk x
  89
  90
  91
  92 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
  93 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
  94 //NCB #define yaffs_SuperToDevice(sb)   ((yaffs_Device *)sb->u.generic_sbp)
  95
  96 //#if defined(CONFIG_KERNEL_2_5)
  97 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  98 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
  99 #else
 100 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 101 #endif
 102
 103
 104 static void yaffs_put_super(struct super_block *sb);
 105
 106 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos);
 107 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
 108 static int yaffs_file_flush(struct file* file);
 109
 110 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
 111
 112 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 113
 114 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 115 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 116 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n);
 117 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n);
 118 #else
 119 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 120 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
 121 #endif
 122 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
 123 static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
 124 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
 125 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
 126
 127 //#if defined(CONFIG_KERNEL_2_5)
 128 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 129 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
 130 #else
 131 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
 132 #endif
 133 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
 134 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 135
 136 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 137 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 138 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 139 #else
 140 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 141 #endif
 142 static void yaffs_read_inode (struct inode *inode);
 143
 144 //#if defined(CONFIG_KERNEL_2_5)
 145 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 146 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data);
 147 #else
 148 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent);
 149 #endif
 150
 151 static void yaffs_put_inode (struct inode *inode);
 152 static void yaffs_delete_inode(struct inode *);
 153 static void yaffs_clear_inode(struct inode *);
 154
 155 static int yaffs_readpage(struct file *file, struct page * page);
 156 static int yaffs_writepage(struct page *page);
 157 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 158 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 159
 160 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen);
 161 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 162
 163
 164
 165
 166 static struct address_space_operations yaffs_file_address_operations = {
 167         readpage:               yaffs_readpage,
 168         writepage:              yaffs_writepage,
 169         prepare_write:  yaffs_prepare_write,
 170         commit_write:   yaffs_commit_write
 171 };
 172
 173
 174 static struct file_operations yaffs_file_operations = {
 175 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
 176         read:           generic_file_read,
 177         write:          generic_file_write,
 178 #else
 179         read:           yaffs_file_read,
 180         write:          yaffs_file_write,
 181 #endif
 182         mmap:           generic_file_mmap,
 183         flush:          yaffs_file_flush,
 184         fsync:          yaffs_sync_object,
 185
 186 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 187         sendfile:       generic_file_sendfile,
 188 #endif
 189 };
 190
 191
 192 static struct inode_operations yaffs_file_inode_operations = {
 193         setattr:        yaffs_setattr,
 194 };
 195
 196
 197 struct inode_operations yaffs_symlink_inode_operations =
 198 {
 199         readlink:       yaffs_readlink,
 200         follow_link:    yaffs_follow_link,
 201         setattr:        yaffs_setattr
 202 };
 203
 204 static struct inode_operations yaffs_dir_inode_operations = {
 205         create:         yaffs_create,
 206         lookup:         yaffs_lookup,
 207         link:           yaffs_link,
 208         unlink:         yaffs_unlink,
 209         symlink:        yaffs_symlink,
 210         mkdir:          yaffs_mkdir,
 211         rmdir:          yaffs_unlink,
 212         mknod:          yaffs_mknod,
 213         rename:         yaffs_rename,
 214         setattr:        yaffs_setattr,
 215 };
 216
 217 static struct file_operations yaffs_dir_operations = {
 218         read:           generic_read_dir,
 219         readdir:        yaffs_readdir,
 220         fsync:          yaffs_sync_object,
 221 };
 222
 223
 224 static struct super_operations yaffs_super_ops = {
 225         statfs:                 yaffs_statfs,
 226         read_inode:             yaffs_read_inode,
 227         put_inode:              yaffs_put_inode,
 228         put_super:              yaffs_put_super,
 229 //      remount_fs:
 230         delete_inode:           yaffs_delete_inode,
 231         clear_inode:            yaffs_clear_inode,
 232 };
 233
 234
 235
 236 static void yaffs_GrossLock(yaffs_Device *dev)
 237 {
 238         T(YAFFS_TRACE_OS,("yaffs locking\n"));
 239
 240         down(&dev->grossLock);
 241 }
 242
 243 static void yaffs_GrossUnlock(yaffs_Device *dev)
 244 {
 245         T(YAFFS_TRACE_OS,("yaffs unlocking\n"));
 246         up(&dev->grossLock);
 247
 248 }
 249
 250 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen)
 251 {
 252         unsigned char *alias;
 253         int ret;
 254
 255         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 256
 257
 258         yaffs_GrossLock(dev);
 259
 260         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 261
 262         yaffs_GrossUnlock(dev);
 263
 264         if(!alias)
 265                 return -ENOMEM;
 266
 267         ret = vfs_readlink(dentry, buffer, buflen, alias);
 268         kfree(alias);
 269         return ret;
 270 }
 271
 272 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 273 {
 274         unsigned char *alias;
 275         int ret;
 276         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 277
 278
 279         yaffs_GrossLock(dev);
 280
 281         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 282
 283         yaffs_GrossUnlock(dev);
 284
 285         if(!alias)
 286                 return -ENOMEM;
 287
 288         ret = vfs_follow_link(nd,alias);
 289         kfree(alias);
 290         return ret;
 291 }
 292
 293
 294 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 295
 296 /*
 297  * Lookup is used to find objects in the fs
 298  */
 299 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 300 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 301
 302 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 303 #else
 304 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 305 #endif
 306 {
 307         yaffs_Object *obj;
 308         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 309
 310         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 311
 312
 313         yaffs_GrossLock(dev);
 314
 315
 316         T(YAFFS_TRACE_OS,("yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 317
 318         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 319
 320         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 321
 322
 323
 324         if(obj)
 325         {
 326                 T(YAFFS_TRACE_OS,("yaffs_lookup found %d\n",obj->objectId));
 327
 328                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode,0,obj);
 329
 330                 if(inode)
 331                 {
 332                         T(YAFFS_TRACE_OS,("yaffs_loookup dentry \n"));
 333 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 334 #if 0
 335                         //dget(dentry); // try to solve directory bug
 336                         d_add(dentry,inode);
 337
 338                         yaffs_GrossUnlock(dev);
 339
 340                         // return dentry;
 341                         return NULL;
 342 #endif
 343                 }
 344
 345         }
 346         else
 347         {
 348                 T(YAFFS_TRACE_OS,("yaffs_lookup not found\n"));
 349
 350         }
 351         yaffs_GrossUnlock(dev);
 352
 353 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 354         d_add(dentry,inode);
 355
 356         return NULL;
 357         //      return (ERR_PTR(-EIO));
 358
 359 }
 360
 361 // For now put inode is just for debugging
 362 // Put inode is called when the inode **structure** is put.
 363 static void yaffs_put_inode(struct inode *inode)
 364 {
 365         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d nlink %d\n",
 366                                (int)inode->i_ino, atomic_read(&inode->i_count), inode->i_nlink));
 367
 368 }
 369
 370 // clear is called to tell the fs to release any per-inode data it holds
 371 static void yaffs_clear_inode(struct inode *inode)
 372 {
 373         yaffs_Object *obj;
 374         yaffs_Device *dev;
 375
 376         obj = yaffs_InodeToObject(inode);
 377
 378         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 379                 obj ? "object exists" : "null object"));
 380
 381         if(obj)
 382         {
 383                 dev = obj->myDev;
 384                 yaffs_GrossLock(dev);
 385
 386                 // Clear the association between the inode ant the yaffs_Object.
 387                 obj->myInode = NULL;
 388                 inode->u.generic_ip = NULL;
 389
 390                 // If the object freeing was deferred, then the real free happens now.
 391                 // This should fix the inode inconsistency problem.
 392
 393                 yaffs_HandleDeferedFree(obj);
 394
 395                 yaffs_GrossUnlock(dev);
 396         }
 397
 398
 399 }
 400
 401 // delete is called when the link count is zero and the inode
 402 // is put (ie. nobody wants to know about it anymore, time to
 403 // delete the file).
 404 // NB Must call clear_inode()
 405 static void yaffs_delete_inode(struct inode *inode)
 406 {
 407         yaffs_Object *obj = yaffs_InodeToObject(inode);
 408         yaffs_Device *dev;
 409
 410         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 411                 obj ? "object exists" : "null object"));
 412
 413         if(obj)
 414         {
 415                 dev = obj->myDev;
 416                 yaffs_GrossLock(dev);
 417                 yaffs_DeleteFile(obj);
 418                 yaffs_GrossUnlock(dev);
 419         }
 420         clear_inode(inode);
 421 }
 422
 423
 424 static int yaffs_file_flush(struct file* file)
 425 {
 426         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 427
 428         yaffs_Device *dev = obj->myDev;
 429
 430         T(YAFFS_TRACE_OS,("yaffs_file_flush object %d (%s)\n",obj->objectId,
 431                                 obj->dirty ? "dirty" : "clean"));
 432
 433         yaffs_GrossLock(dev);
 434
 435     yaffs_FlushFile(obj,1);
 436
 437         yaffs_GrossUnlock(dev);
 438
 439     return 0;
 440 }
 441
 442
 443
 444 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 445 {
 446         // Lifted from jffs2
 447
 448         yaffs_Object *obj;
 449         unsigned char *pg_buf;
 450         int ret;
 451
 452         yaffs_Device *dev;
 453
 454         T(YAFFS_TRACE_OS,("yaffs_readpage at %08x, size %08x\n",
 455                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 456
 457         obj  = yaffs_DentryToObject(f->f_dentry);
 458
 459         dev = obj->myDev;
 460
 461
 462         if (!PageLocked(pg))
 463                 PAGE_BUG(pg);
 464
 465         pg_buf = kmap(pg);
 466         /* FIXME: Can kmap fail? */
 467
 468         yaffs_GrossLock(dev);
 469
 470         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 471
 472         yaffs_GrossUnlock(dev);
 473
 474         if(ret >= 0) ret = 0;
 475
 476         if (ret) {
 477                 ClearPageUptodate(pg);
 478                 SetPageError(pg);
 479         } else {
 480                 SetPageUptodate(pg);
 481                 ClearPageError(pg);
 482         }
 483
 484         flush_dcache_page(pg);
 485         kunmap(pg);
 486
 487
 488         T(YAFFS_TRACE_OS,("yaffs_readpage done\n"));
 489         return ret;
 490 }
 491
 492 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 493 {
 494         int ret = yaffs_readpage_nolock(f,pg);
 495         UnlockPage(pg);
 496         return ret;
 497 }
 498
 499 static int yaffs_readpage(struct file *f, struct page * pg)
 500 {
 501         return yaffs_readpage_unlock(f,pg);
 502 }
 503
 504 // writepage inspired by/stolen from smbfs
 505 //
 506
 507 static int yaffs_writepage(struct page *page)
 508 {
 509         struct address_space *mapping = page->mapping;
 510         struct inode *inode;
 511         unsigned long end_index;
 512         char *buffer;
 513         yaffs_Object *obj;
 514         int nWritten = 0;
 515         unsigned nBytes;
 516
 517         if (!mapping)
 518                 BUG();
 519         inode = mapping->host;
 520         if (!inode)
 521                 BUG();
 522
 523         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 524
 525         /* easy case */
 526         if (page->index < end_index)
 527         {
 528                 nBytes = PAGE_CACHE_SIZE;
 529         }
 530         else
 531         {
 532                 nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
 533         }
 534         //  What's happening here?
 535         ///* OK, are we completely out? */
 536         //if (page->index >= end_index+1 || !offset)
 537         //      return -EIO;
 538
 539         get_page(page);
 540
 541
 542         buffer = kmap(page);
 543
 544         obj = yaffs_InodeToObject(inode);
 545         yaffs_GrossLock(obj->myDev);
 546
 547
 548         nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes);
 549
 550         yaffs_GrossUnlock(obj->myDev);
 551
 552         kunmap(page);
 553         SetPageUptodate(page);
 554         UnlockPage(page);
 555         put_page(page);
 556
 557         return (nWritten == nBytes) ? 0  : -ENOSPC;
 558 }
 559
 560
 561
 562 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 563 {
 564
 565         T(YAFFS_TRACE_OS,("yaffs_prepair_write\n"));
 566         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 567                 return  yaffs_readpage_nolock(f,pg);
 568
 569         return 0;
 570
 571 }
 572
 573 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 574 {
 575
 576         void *addr = page_address(pg) + offset;
 577         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 578         int nBytes = to - offset;
 579         int nWritten;
 580
 581         unsigned spos = pos;
 582         unsigned saddr = (unsigned)addr;
 583
 584         T(YAFFS_TRACE_OS,("yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 585
 586         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 587
 588         if(nWritten != nBytes)
 589         {
 590                 T(YAFFS_TRACE_OS,("yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 591                 SetPageError(pg);
 592                 ClearPageUptodate(pg);
 593         }
 594         else
 595         {
 596                 SetPageUptodate(pg);
 597         }
 598
 599         T(YAFFS_TRACE_OS,("yaffs_commit_write returning %d\n",nWritten));
 600
 601         return nWritten;
 602
 603 }
 604
 605
 606
 607 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 608 {
 609         if (inode && obj)
 610         {
 611                 inode->i_ino = obj->objectId;
 612                 inode->i_mode = obj->st_mode;
 613                 inode->i_uid = obj->st_uid;
 614                 inode->i_gid = obj->st_gid;
 615                 inode->i_blksize = inode->i_sb->s_blocksize;
 616 //#if defined(CONFIG_KERNEL_2_5)
 617 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 618
 619                 inode->i_rdev = old_decode_dev(obj->st_rdev);
 620                 inode->i_atime.tv_sec = (time_t)(obj->st_atime);
 621                 inode->i_atime.tv_nsec = 0;
 622                 inode->i_mtime.tv_sec = (time_t)obj->st_mtime;
 623                 inode->i_mtime.tv_nsec =0;
 624                 inode->i_ctime.tv_sec = (time_t)obj->st_ctime;
 625                 inode->i_ctime.tv_nsec = 0;
 626 #else
 627                 inode->i_rdev = obj->st_rdev;
 628                 inode->i_atime = obj->st_atime;
 629                 inode->i_mtime = obj->st_mtime;
 630                 inode->i_ctime = obj->st_ctime;
 631 #endif
 632                 inode->i_size = yaffs_GetObjectFileLength(obj);
 633                 inode->i_blocks = (inode->i_size + 511) >> 9;
 634
 635                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 636
 637                 T(YAFFS_TRACE_OS,("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 638                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 639
 640                 switch (obj->st_mode & S_IFMT)
 641                 {
 642                         default: // fifo, device or socket
 643                                 init_special_inode(inode, obj->st_mode,(dev_t)(obj->st_rdev));
 644                                 break;
 645                         case S_IFREG:   // file
 646                                 inode->i_op = &yaffs_file_inode_operations;
 647                                 inode->i_fop = &yaffs_file_operations;
 648                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 649                                 break;
 650                         case S_IFDIR:   // directory
 651                                 inode->i_op = &yaffs_dir_inode_operations;
 652                                 inode->i_fop = &yaffs_dir_operations;
 653                                 break;
 654                         case S_IFLNK:   // symlink
 655                                 inode->i_op = &yaffs_symlink_inode_operations;
 656                                 break;
 657                 }
 658
 659
 660                 inode->u.generic_ip = obj;
 661                 obj->myInode = inode;
 662
 663         }
 664         else
 665         {
 666                 T(YAFFS_TRACE_OS,("yaffs_FileInode invalid parameters\n"));
 667         }
 668
 669 }
 670
 671 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 672 {
 673         struct inode * inode;
 674
 675         T(YAFFS_TRACE_OS,("yaffs_get_inode for object %d\n",obj->objectId));
 676
 677         inode = iget(sb,obj->objectId);
 678
 679         // NB Side effect: iget calls back to yaffs_read_inode().
 680         // iget also increments the inode's i_count
 681
 682         return inode;
 683 }
 684
 685 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 686 {
 687         yaffs_Object *obj;
 688         int nRead,ipos;
 689         struct inode *inode;
 690         yaffs_Device *dev;
 691
 692         T(YAFFS_TRACE_OS,("yaffs_file_read\n"));
 693
 694         obj  = yaffs_DentryToObject(f->f_dentry);
 695
 696         dev = obj->myDev;
 697
 698         yaffs_GrossLock(dev);
 699
 700         inode = f->f_dentry->d_inode;
 701
 702         if (*pos < inode->i_size)
 703         {
 704                         if (*pos + n > inode->i_size)
 705                         {
 706                                 n = inode->i_size - *pos;
 707                         }
 708         }
 709         else
 710         {
 711                 n = 0;
 712         }
 713
 714         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 715         if(nRead > 0)
 716         {
 717                 f->f_pos += nRead;
 718         }
 719
 720         yaffs_GrossUnlock(dev);
 721
 722         ipos = *pos;
 723
 724         T(YAFFS_TRACE_OS,("yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 725         return nRead;
 726
 727 }
 728
 729
 730 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 731 {
 732         yaffs_Object *obj;
 733         int nWritten,ipos;
 734         struct inode *inode;
 735         yaffs_Device *dev;
 736
 737
 738         obj  = yaffs_DentryToObject(f->f_dentry);
 739
 740         dev = obj->myDev;
 741
 742         yaffs_GrossLock(dev);
 743
 744         inode = f->f_dentry->d_inode;
 745
 746         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 747         {
 748                 ipos = inode->i_size;
 749         }
 750         else
 751         {
 752                 ipos = *pos;
 753         }
 754
 755
 756         if(!obj)
 757         {
 758                 T(YAFFS_TRACE_OS,("yaffs_file_write: hey obj is null!\n"));
 759         }
 760         else
 761         {
 762                 T(YAFFS_TRACE_OS,("yaffs_file_write about to write writing %d bytes to object %d at %d\n",n,obj->objectId,ipos));
 763         }
 764
 765         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n);
 766
 767         T(YAFFS_TRACE_OS,("yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 768         if(nWritten > 0)
 769         {
 770                 ipos += nWritten;
 771                 *pos = ipos;
 772                 if(ipos > inode->i_size)
 773                 {
 774                         inode->i_size = ipos;
 775                         inode->i_blocks = (ipos + 511)>>9;
 776
 777                         T(YAFFS_TRACE_OS,("yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 778                 }
 779
 780         }
 781         yaffs_GrossUnlock(dev);
 782
 783         return nWritten != n ? -ENOSPC : nWritten;
 784 }
 785
 786
 787 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 788 {
 789         yaffs_Object *obj;
 790         yaffs_Device *dev;
 791         struct inode *inode = f->f_dentry->d_inode;
 792         unsigned long offset, curoffs;
 793         struct list_head *i;
 794         yaffs_Object *l;
 795
 796         char name[YAFFS_MAX_NAME_LENGTH +1];
 797
 798         obj =  yaffs_DentryToObject(f->f_dentry);
 799         dev = obj->myDev;
 800
 801         yaffs_GrossLock(dev);
 802
 803         offset = f->f_pos;
 804
 805         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 806
 807         if(offset == 0)
 808         {
 809         T(YAFFS_TRACE_OS,("yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 810                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 811                 {
 812                         goto out;
 813                 }
 814                 offset++;
 815                 f->f_pos++;
 816         }
 817         if(offset == 1)
 818         {
 819                 T(YAFFS_TRACE_OS,("yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 820                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 821                 {
 822                         goto out;
 823                 }
 824                 offset++;
 825                 f->f_pos++;
 826         }
 827
 828         curoffs = 1;
 829
 830         list_for_each(i,&obj->variant.directoryVariant.children)
 831         {
 832                 curoffs++;
 833                 if(curoffs >= offset)
 834                 {
 835                         l = list_entry(i, yaffs_Object,siblings);
 836
 837                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 838                         T(YAFFS_TRACE_OS,("yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 839
 840                         if(filldir(dirent,
 841                                            name,
 842                                            strlen(name),
 843                                            offset,
 844                                            yaffs_GetObjectInode(l),
 845                                            yaffs_GetObjectType(l))
 846                                            < 0)
 847                         {
 848                                 goto up_and_out;
 849                         }
 850
 851                         offset++;
 852                         f->f_pos++;
 853                 }
 854         }
 855
 856   up_and_out:
 857   out:
 858
 859     yaffs_GrossUnlock(dev);
 860
 861         return 0;
 862 }
 863
 864
 865 /*
 866  * File creation. Allocate an inode, and we're done..
 867  */
 868 //#if defined(CONFIG_KERNEL_2_5)
 869 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 870 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 871 #else
 872 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 873 #endif
 874 {
 875         struct inode *inode;
 876
 877         yaffs_Object *obj = NULL;
 878         yaffs_Device *dev;
 879
 880         yaffs_Object *parent = yaffs_InodeToObject(dir);
 881
 882         int error = -ENOSPC;
 883
 884         if(parent)
 885         {
 886                 T(YAFFS_TRACE_OS,("yaffs_mknod: parent object %d type %d\n",
 887                                          parent->objectId,parent->variantType));
 888         }
 889         else
 890         {
 891                 T(YAFFS_TRACE_OS,("yaffs_mknod: could not get parent object\n"));
 892                 return -EPERM;
 893         }
 894
 895         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 896                                         dentry->d_name.name, mode,rdev));
 897
 898         dev = parent->myDev;
 899
 900         yaffs_GrossLock(dev);
 901
 902         switch (mode & S_IFMT)
 903         {
 904                 default:
 905                         // Special (socket, fifo, device...)
 906                         T(YAFFS_TRACE_OS,("yaffs_mknod: making special\n"));
 907                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 908                         break;
 909                 case S_IFREG:   // file
 910                         T(YAFFS_TRACE_OS,("yaffs_mknod: making file\n"));
 911                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 912                         break;
 913                 case S_IFDIR:   // directory
 914                         T(YAFFS_TRACE_OS,("yaffs_mknod: making directory\n"));
 915                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 916                         break;
 917                 case S_IFLNK:   // symlink
 918                         T(YAFFS_TRACE_OS,("yaffs_mknod: making file\n"));
 919                         obj = NULL; // Do we ever get here?
 920                         break;
 921         }
 922
 923         if(obj)
 924         {
 925                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 926                 d_instantiate(dentry, inode);
 927                 T(YAFFS_TRACE_OS,("yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 928                 error = 0;
 929         }
 930         else
 931         {
 932                 T(YAFFS_TRACE_OS,("yaffs_mknod failed making object\n"));
 933                 error = -ENOMEM;
 934         }
 935
 936         yaffs_GrossUnlock(dev);
 937
 938         return error;
 939 }
 940
 941 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 942 {
 943         int retVal;
 944         T(YAFFS_TRACE_OS,("yaffs_mkdir\n"));
 945         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 946 #if 0
 947  // attempt to fix dir bug - didn't work
 948         if(!retVal)
 949         {
 950                 dget(dentry);
 951         }
 952 #endif
 953         return retVal;
 954 }
 955
 956 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 957 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 958 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
 959 #else
 960 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 961 #endif
 962 {
 963         T(YAFFS_TRACE_OS,("yaffs_create\n"));
 964         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 965 }
 966
 967
 968 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 969 {
 970         int retVal;
 971
 972         yaffs_Device *dev;
 973
 974
 975         T(YAFFS_TRACE_OS,("yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
 976
 977         dev = yaffs_InodeToObject(dir)->myDev;
 978
 979         yaffs_GrossLock(dev);
 980
 981
 982         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
 983
 984
 985         yaffs_GrossUnlock(dev);
 986
 987         if( retVal == YAFFS_OK)
 988         {
 989                 dentry->d_inode->i_nlink--;
 990                 mark_inode_dirty(dentry->d_inode);
 991                 return 0;
 992         }
 993         else
 994         {
 995                 return -ENOTEMPTY;
 996         }
 997 }
 998
 999
1000 /*
1001  * Create a link...
1002  */
1003 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
1004 {
1005         struct inode *inode = old_dentry->d_inode;
1006         yaffs_Object *obj = NULL;
1007         yaffs_Object *link=NULL;
1008         yaffs_Device *dev;
1009
1010         T(YAFFS_TRACE_OS,("yaffs_link\n"));
1011
1012         obj = yaffs_InodeToObject(inode);
1013         dev = obj->myDev;
1014
1015         yaffs_GrossLock(dev);
1016
1017         if (!S_ISDIR(inode->i_mode))    // Don't link directories
1018         {
1019                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
1020         }
1021
1022
1023         if(link)
1024         {
1025                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
1026                 d_instantiate(dentry, old_dentry->d_inode);
1027                 atomic_inc(&old_dentry->d_inode->i_count);
1028                 T(YAFFS_TRACE_OS,("yaffs_link link count %d i_count %d\n",
1029                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
1030
1031         }
1032
1033         yaffs_GrossUnlock(dev);
1034
1035
1036         if(link)
1037         {
1038
1039                 return 0;
1040         }
1041
1042
1043         return -EPERM;
1044 }
1045
1046
1047 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
1048 {
1049         yaffs_Object *obj;
1050         yaffs_Device *dev;
1051
1052         T(YAFFS_TRACE_OS,("yaffs_symlink\n"));
1053
1054         dev = yaffs_InodeToObject(dir)->myDev;
1055         yaffs_GrossLock(dev);
1056         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1057                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
1058                                                          symname);
1059         yaffs_GrossUnlock(dev);
1060
1061         if(obj)
1062         {
1063
1064                 struct inode* inode;
1065
1066                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode, 0, obj);
1067                 d_instantiate(dentry, inode);
1068                 T(YAFFS_TRACE_OS,("symlink created OK\n"));
1069                 return 0;
1070         }
1071         else
1072         {
1073                 T(YAFFS_TRACE_OS,("symlink not created\n"));
1074
1075         }
1076
1077         return -ENOMEM;
1078 }
1079
1080 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
1081 {
1082
1083         yaffs_Object *obj;
1084         yaffs_Device *dev;
1085
1086         obj = yaffs_DentryToObject(dentry);
1087
1088         dev = obj->myDev;
1089
1090         T(YAFFS_TRACE_OS,("yaffs_sync_object\n"));
1091         yaffs_GrossLock(dev);
1092         yaffs_FlushFile(obj,1);
1093         yaffs_GrossUnlock(dev);
1094         return 0;
1095 }
1096
1097 /*
1098  * The VFS layer already does all the dentry stuff for rename.
1099  *
1100  * NB: POSIX says you can rename an object over an old object of the same name
1101  */
1102 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1103 {
1104         yaffs_Device *dev;
1105         int retVal = YAFFS_FAIL;
1106         int removed = 0;
1107         yaffs_Object *target;
1108
1109         dev = yaffs_InodeToObject(old_dir)->myDev;
1110
1111         yaffs_GrossLock(dev);
1112
1113         // Check if the target is an existing directory that is not empty.
1114         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1115
1116         if(target &&
1117            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1118            !list_empty(&target->variant.directoryVariant.children))
1119         {
1120                 retVal = YAFFS_FAIL;
1121         }
1122         else
1123         {
1124
1125                 // Unlink the target if it exists
1126                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1127
1128
1129                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1130                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1131
1132         }
1133         yaffs_GrossUnlock(dev);
1134
1135         if(retVal == YAFFS_OK)
1136         {
1137                 if(removed == YAFFS_OK)
1138                 {
1139                         new_dentry->d_inode->i_nlink--;
1140                         mark_inode_dirty(new_dentry->d_inode);
1141                 }
1142
1143                 return 0;
1144         }
1145         else
1146         {
1147                 return -ENOTEMPTY;
1148         }
1149
1150
1151 }
1152
1153 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1154 {
1155         struct inode *inode = dentry->d_inode;
1156         int error;
1157         yaffs_Device *dev;
1158
1159         T(YAFFS_TRACE_OS,("yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1160
1161         if((error = inode_change_ok(inode,attr)) == 0)
1162         {
1163
1164                 dev = yaffs_InodeToObject(inode)->myDev;
1165                 yaffs_GrossLock(dev);
1166                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1167                 {
1168                         error = 0;
1169                 }
1170                 else
1171                 {
1172                         error = -EPERM;
1173                 }
1174                 yaffs_GrossUnlock(dev);
1175                 inode_setattr(inode,attr);
1176         }
1177         return error;
1178 }
1179
1180 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
1181 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1182 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1183 #else
1184 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1185 #endif
1186 {
1187         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1188         T(YAFFS_TRACE_OS,("yaffs_statfs\n"));
1189
1190         yaffs_GrossLock(dev);
1191
1192         buf->f_type = YAFFS_MAGIC;
1193         buf->f_bsize = sb->s_blocksize;
1194         buf->f_namelen = 255;
1195         buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * YAFFS_CHUNKS_PER_BLOCK/
1196                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1197         buf->f_files = 0;
1198         buf->f_ffree = 0;
1199         buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1200                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1201         buf->f_bavail =  buf->f_bfree;
1202
1203         yaffs_GrossUnlock(dev);
1204         return 0;
1205 }
1206
1207 static void yaffs_read_inode (struct inode *inode)
1208 {
1209         // NB This is called as a side effect of other functions and
1210         // thus gross locking should always be in place already.
1211
1212         yaffs_Object *obj ;
1213         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1214
1215         T(YAFFS_TRACE_OS,("yaffs_read_inode for %d\n",(int)inode->i_ino));
1216
1217         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1218
1219         yaffs_FillInodeFromObject(inode,obj);
1220
1221 }
1222
1223
1224
1225 static yaffs_Device *yaffs_dev;
1226 static yaffs_Device *yaffsram_dev;
1227
1228
1229
1230 static void yaffs_put_super(struct super_block *sb)
1231 {
1232         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1233
1234         yaffs_GrossLock(dev);
1235         if(dev->putSuperFunc)
1236         {
1237                  dev->putSuperFunc(sb);
1238         }
1239         yaffs_Deinitialise(dev);
1240         yaffs_GrossUnlock(dev);
1241
1242         if(dev == yaffs_dev) yaffs_dev = NULL;
1243         if(dev == yaffsram_dev) yaffsram_dev = NULL;
1244
1245         kfree(dev);
1246 }
1247
1248
1249 #ifdef CONFIG_YAFFS_MTD_ENABLED
1250
1251 static void  yaffs_MTDPutSuper(struct super_block *sb)
1252 {
1253
1254         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1255
1256         if(mtd->sync)
1257         {
1258                 mtd->sync(mtd);
1259         }
1260
1261         put_mtd_device(mtd);
1262 }
1263
1264 #endif
1265
1266
1267 static struct super_block *yaffs_internal_read_super(int useRam, struct super_block * sb, void * data, int silent)
1268 {
1269         int nBlocks;
1270         struct inode * inode;
1271         struct dentry * root;
1272         yaffs_Device *dev;
1273
1274         sb->s_magic = YAFFS_MAGIC;
1275         sb->s_op = &yaffs_super_ops;
1276
1277         if(!sb)
1278                 T(YAFFS_TRACE_OS,("yaffs: sb is NULL\n"));
1279         else if(!sb->s_dev)
1280                 T(YAFFS_TRACE_OS,("yaffs: sb->s_dev is NULL\n"));
1281         else if(! kdevname(sb->s_dev))
1282                 T(YAFFS_TRACE_OS,("yaffs: kdevname is NULL\n"));
1283         else
1284                 T(YAFFS_TRACE_OS,("yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev)));
1285
1286
1287
1288 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1289         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1290         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1291 #else
1292         sb->s_blocksize = PAGE_CACHE_SIZE;
1293         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1294 #endif
1295         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1296
1297 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1298         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1299 #endif
1300
1301
1302
1303         if(useRam)
1304         {
1305
1306 #ifdef CONFIG_YAFFS_RAM_ENABLED
1307                 // Set the yaffs_Device up for ram emulation
1308
1309                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1310                 if(!dev)
1311                 {
1312                         // Deep shit could not allocate device structure
1313                         T(YAFFS_TRACE_OS,("yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n"));
1314                         return NULL;
1315                 }
1316
1317                 memset(dev,0,sizeof(yaffs_Device));
1318                 dev->genericDevice = NULL; // Not used for RAM emulation.
1319
1320                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1321                 dev->startBlock = 1;  // Don't use block 0
1322                 dev->endBlock = nBlocks - 1;
1323                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1324                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1325                 dev->nReservedBlocks = 5;
1326
1327                 dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1328                 dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1329                 dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1330                 dev->initialiseNAND = nandemul_InitialiseNAND;
1331
1332                 yaffsram_dev = dev;
1333
1334 #endif
1335
1336         }
1337         else
1338         {
1339 #ifdef CONFIG_YAFFS_MTD_ENABLED
1340                 struct mtd_info *mtd;
1341
1342                 T(YAFFS_TRACE_ALWAYS,( "yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1343                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev)));
1344
1345                 // Check it's an mtd device.....
1346                 if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1347                 {
1348                         return NULL; // This isn't an mtd device
1349                 }
1350
1351                 // Get the device
1352                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1353                 if (!mtd)
1354                 {
1355                         T(YAFFS_TRACE_ALWAYS,( "yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev)));
1356                         return NULL;
1357                 }
1358
1359                 // Check it's NAND
1360                 if(mtd->type != MTD_NANDFLASH)
1361                 {
1362                         T(YAFFS_TRACE_ALWAYS,( "yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1363                         return NULL;
1364                 }
1365
1366                 //T(YAFFS_TRACE_OS,(KERN_DEBUG" erase %x\n",mtd->erase);
1367                 //T(YAFFS_TRACE_OS,(KERN_DEBUG" read %x\n",mtd->read);
1368                 //T(YAFFS_TRACE_OS,(KERN_DEBUG" write %x\n",mtd->write);
1369                 //T(YAFFS_TRACE_OS,(KERN_DEBUG" readoob %x\n",mtd->read_oob);
1370                 //T(YAFFS_TRACE_OS,(KERN_DEBUG" writeoob %x\n",mtd->write_oob);
1371                 //T(YAFFS_TRACE_OS,(KERN_DEBUG" oobblock %x\n",mtd->oobblock);
1372                 //T(YAFFS_TRACE_OS,(KERN_DEBUG" oobsize %x\n",mtd->oobsize);
1373
1374
1375                 if(!mtd->erase ||
1376                    !mtd->read  ||
1377                    !mtd->write ||
1378 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1379                    !mtd->write_ecc ||
1380                    !mtd->read_ecc ||
1381 #endif
1382                    !mtd->read_oob ||
1383                    !mtd->write_oob )
1384                 {
1385                         T(YAFFS_TRACE_ALWAYS,( "yaffs: MTD device does not support required functions\n"));
1386                         return NULL;
1387                 }
1388
1389                 if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1390                    mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1391                 {
1392                         T(YAFFS_TRACE_ALWAYS,( "yaffs: MTD device does not support have the right page sizes\n"));
1393                         return NULL;
1394                 }
1395
1396
1397                 // OK, so if we got here, we have an MTD that's NAND and looks
1398                 // like it has the right capabilities
1399                 // Set the yaffs_Device up for ram emulation
1400
1401 //#if defined(CONFIG_KERNEL_2_5)
1402 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1403                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1404 #else
1405                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1406 #endif
1407                 if(!dev)
1408                 {
1409                         // Deep shit could not allocate device structure
1410                         T(YAFFS_TRACE_ALWAYS,("yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n"));
1411                         return NULL;
1412                 }
1413
1414                 memset(dev,0,sizeof(yaffs_Device));
1415                 dev->genericDevice = mtd;
1416
1417                 // Set up the memory size parameters....
1418
1419                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1420                 dev->startBlock = 1;  // Don't use block 0
1421                 dev->endBlock = nBlocks - 1;
1422                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1423                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1424                 dev->nReservedBlocks = 5;
1425                 dev->nShortOpCaches = 10; // Enable short op caching
1426
1427
1428                 // ... and the functions.
1429                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1430                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1431                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1432                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1433
1434                 dev->putSuperFunc = yaffs_MTDPutSuper;
1435
1436 #ifdef CONFIG_YAFFS_USE_NANDECC
1437                 dev->useNANDECC = 1;
1438 #endif
1439
1440                 yaffs_dev = dev;
1441
1442 #endif
1443         }
1444
1445         init_MUTEX(&dev->grossLock);
1446
1447
1448         yaffs_GrossLock(dev);
1449         yaffs_GutsInitialise(yaffs_SuperToDevice(sb));
1450
1451         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised\n"));
1452
1453         // Create root inode
1454         inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(yaffs_SuperToDevice(sb)));
1455
1456         yaffs_GrossUnlock(dev);
1457
1458         if (!inode)
1459                 return NULL;
1460
1461 // added NCB
1462         inode->i_op = & yaffs_dir_inode_operations;
1463         inode->i_fop = & yaffs_dir_operations;
1464
1465         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1466
1467
1468         root = d_alloc_root(inode);
1469
1470         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1471
1472         if (!root) {
1473                 iput(inode);
1474                 return NULL;
1475         }
1476         sb->s_root = root;
1477
1478         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1479         return sb;
1480 }
1481
1482 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1483 {
1484          return yaffs_internal_read_super(1,sb,data,silent) ? 0 : -1;
1485 }
1486 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1487 {
1488          return yaffs_internal_read_super(0,sb,data,silent) ? 0 : -1;
1489 }
1490
1491
1492 #ifdef CONFIG_YAFFS_MTD_ENABLED
1493 //#if defined(CONFIG_KERNEL_2_5)
1494 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1495 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1496 {
1497
1498     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1499 }
1500
1501 /* changes NCB 2.5.70 */
1502 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1503 static struct file_system_type yaffs_fs_type = {
1504         .owner          = THIS_MODULE,
1505         .name           = "yaffs",
1506         .get_sb         = yaffs_read_super,
1507         .kill_sb        = kill_block_super,
1508 //      .kill_sb        = kill_litter_super,
1509         .fs_flags       = FS_REQUIRES_DEV,
1510 };
1511 #else
1512 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1513 {
1514         return yaffs_internal_read_super(0,sb,data,silent);
1515 }
1516
1517 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1518 #endif
1519 #endif
1520
1521 #ifdef CONFIG_YAFFS_RAM_ENABLED
1522
1523 //#if defined(CONFIG_KERNEL_2_5)
1524 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1525 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1526 {
1527
1528     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_ram);
1529 }
1530
1531 /* changes NCB 2.5.70 */
1532 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1533 static struct file_system_type yaffs_fs_type = {
1534         .owner          = THIS_MODULE,
1535         .name           = "yaffsram",
1536         .get_sb         = yaffs_ram_read_super,
1537         .kill_sb        = kill_block_super,
1538 //      .kill_sb        = kill_litter_super,
1539         .fs_flags       = FS_SINGLE,
1540 };
1541 #else
1542 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1543 {
1544         return yaffs_internal_read_super(1,sb,data,silent);
1545 }
1546
1547 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1548 #endif
1549 #endif // CONFIG_YAFFS_RAM_ENABLED
1550
1551
1552 static struct proc_dir_entry *my_proc_entry;
1553 static struct proc_dir_entry *my_proc_ram_write_entry;
1554
1555 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
1556 {
1557         buf +=sprintf(buf,"\nDevice %s\n",name);
1558         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1559         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1560         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1561         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1562         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1563         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1564         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1565         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1566         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1567         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1568         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1569         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1570         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1571         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1572         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1573         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1574         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1575         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1576         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1577         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1578         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1579         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1580         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1581         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1582         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1583         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1584         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1585
1586
1587         return buf;
1588 }
1589
1590 static int  yaffs_proc_read(
1591         char *page,
1592         char **start,
1593         off_t offset,
1594         int count,
1595         int *eof,
1596         void *data
1597         )
1598 {
1599
1600         char my_buffer[3000];
1601         char *buf;
1602         buf = my_buffer;
1603
1604         if (offset > 0) return 0;
1605
1606         /* Fill the buffer and get its length */
1607         buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
1608
1609         if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
1610         if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
1611
1612
1613         strcpy(page,my_buffer);
1614         return strlen(my_buffer);
1615 }
1616
1617
1618 static int  yaffs_proc_ram_write(
1619         char *page,
1620         char **start,
1621         off_t offset,
1622         int count,
1623         int *eof,
1624         void *data
1625         )
1626 {
1627
1628         T(YAFFS_TRACE_OS,( "yaffs write size %d\n",count));
1629         return count;
1630 }
1631
1632 static int __init init_yaffs_fs(void)
1633 {
1634         int error = 0;
1635
1636         yaffs_dev = yaffsram_dev = NULL;
1637
1638         T(YAFFS_TRACE_OS,( "yaffs " __DATE__ " " __TIME__ " Initialisation\n"));
1639 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
1640         T(YAFFS_TRACE_OS,( "yaffs is using generic read/write (caching)\n"));
1641 #else
1642         T(YAFFS_TRACE_OS,( "yaffs is using direct read/write (uncached)\n"));
1643 #endif
1644
1645
1646     /* Install the proc_fs entry */
1647     my_proc_entry = create_proc_read_entry("yaffs",
1648                                            S_IRUGO | S_IFREG,
1649                                            &proc_root,
1650                                            yaffs_proc_read,
1651                                            NULL);
1652     if(!my_proc_entry)
1653     {
1654        return -ENOMEM;
1655     }
1656
1657 #ifdef CONFIG_YAFFS_RAM_ENABLED
1658 #if 0
1659     my_proc_ram_write_entry = create_proc_entry("yaffs_ram",
1660                                            S_IRUGO | S_IFREG,
1661                                            &proc_root);
1662
1663     if(!my_proc_ram_write_entry)
1664     {
1665        return -ENOMEM;
1666     }
1667     else
1668     {
1669         my_proc_ram_write_entry->write_proc = yaffs_proc_ram_write;
1670     }
1671 #endif
1672
1673     error = register_filesystem(&yaffs_ram_fs_type);
1674     if(error)
1675     {
1676         return error;
1677     }
1678 #endif //CONFIG_YAFFS_RAM_ENABLED
1679
1680 #ifdef CONFIG_YAFFS_MTD_ENABLED
1681         error = register_filesystem(&yaffs_fs_type);
1682         if(error)
1683         {
1684 #ifdef CONFIG_YAFFS_RAM_ENABLED
1685                 unregister_filesystem(&yaffs_ram_fs_type);
1686 #endif //CONFIG_YAFFS_RAM_ENABLED
1687         }
1688 #endif // CONFIG_YAFFS_MTD_ENABLED
1689
1690         return error;
1691 }
1692
1693 static void __exit exit_yaffs_fs(void)
1694 {
1695         T(YAFFS_TRACE_OS,( "yaffs " __DATE__ " " __TIME__ " Clean up\n"));
1696
1697     remove_proc_entry("yaffs",&proc_root);
1698
1699 #ifdef CONFIG_YAFFS_RAM_ENABLED
1700         unregister_filesystem(&yaffs_ram_fs_type);
1701 #endif
1702 #ifdef CONFIG_YAFFS_MTD_ENABLED
1703         unregister_filesystem(&yaffs_fs_type);
1704 #endif
1705
1706 }
1707
1708 module_init(init_yaffs_fs)
1709 module_exit(exit_yaffs_fs)
1710
1711 MODULE_DESCRIPTION("YAFFS - a NAND specific flash file system");
1712 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002");
1713 MODULE_LICENSE("GPL");
1714