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 1.35 2004-10-20 20:12:43 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
 187
 188 static struct inode_operations yaffs_file_inode_operations = {
 189         setattr:        yaffs_setattr,
 190 };
 191
 192
 193 struct inode_operations yaffs_symlink_inode_operations =
 194 {
 195         readlink:       yaffs_readlink,
 196         follow_link:    yaffs_follow_link,
 197         setattr:        yaffs_setattr
 198 };
 199
 200 static struct inode_operations yaffs_dir_inode_operations = {
 201         create:         yaffs_create,
 202         lookup:         yaffs_lookup,
 203         link:           yaffs_link,
 204         unlink:         yaffs_unlink,
 205         symlink:        yaffs_symlink,
 206         mkdir:          yaffs_mkdir,
 207         rmdir:          yaffs_unlink,
 208         mknod:          yaffs_mknod,
 209         rename:         yaffs_rename,
 210         setattr:        yaffs_setattr,
 211 };
 212
 213 static struct file_operations yaffs_dir_operations = {
 214         read:           generic_read_dir,
 215         readdir:        yaffs_readdir,
 216         fsync:          yaffs_sync_object,
 217 };
 218
 219
 220 static struct super_operations yaffs_super_ops = {
 221         statfs:                 yaffs_statfs,
 222         read_inode:             yaffs_read_inode,
 223         put_inode:              yaffs_put_inode,
 224         put_super:              yaffs_put_super,
 225 //      remount_fs:
 226         delete_inode:           yaffs_delete_inode,
 227         clear_inode:            yaffs_clear_inode,
 228 };
 229
 230
 231
 232 static void yaffs_GrossLock(yaffs_Device *dev)
 233 {
 234         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
 235
 236         down(&dev->grossLock);
 237 }
 238
 239 static void yaffs_GrossUnlock(yaffs_Device *dev)
 240 {
 241         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
 242         up(&dev->grossLock);
 243
 244 }
 245
 246 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen)
 247 {
 248         unsigned char *alias;
 249         int ret;
 250
 251         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 252
 253
 254         yaffs_GrossLock(dev);
 255
 256         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 257
 258         yaffs_GrossUnlock(dev);
 259
 260         if(!alias)
 261                 return -ENOMEM;
 262
 263         ret = vfs_readlink(dentry, buffer, buflen, alias);
 264         kfree(alias);
 265         return ret;
 266 }
 267
 268 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 269 {
 270         unsigned char *alias;
 271         int ret;
 272         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 273
 274
 275         yaffs_GrossLock(dev);
 276
 277         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 278
 279         yaffs_GrossUnlock(dev);
 280
 281         if(!alias)
 282                 return -ENOMEM;
 283
 284         ret = vfs_follow_link(nd,alias);
 285         kfree(alias);
 286         return ret;
 287 }
 288
 289
 290 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 291
 292 /*
 293  * Lookup is used to find objects in the fs
 294  */
 295 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 296 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 297
 298 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 299 #else
 300 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 301 #endif
 302 {
 303         yaffs_Object *obj;
 304         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 305
 306         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 307
 308
 309         yaffs_GrossLock(dev);
 310
 311
 312         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 313
 314         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 315
 316         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 317
 318
 319
 320         if(obj)
 321         {
 322                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 323
 324                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode,0,obj);
 325
 326                 if(inode)
 327                 {
 328                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
 329 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 330 #if 0
 331                         //dget(dentry); // try to solve directory bug
 332                         d_add(dentry,inode);
 333
 334                         yaffs_GrossUnlock(dev);
 335
 336                         // return dentry;
 337                         return NULL;
 338 #endif
 339                 }
 340
 341         }
 342         else
 343         {
 344                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
 345
 346         }
 347         yaffs_GrossUnlock(dev);
 348
 349 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 350         d_add(dentry,inode);
 351
 352         return NULL;
 353         //      return (ERR_PTR(-EIO));
 354
 355 }
 356
 357 // For now put inode is just for debugging
 358 // Put inode is called when the inode **structure** is put.
 359 static void yaffs_put_inode(struct inode *inode)
 360 {
 361         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 362
 363 }
 364
 365 // clear is called to tell the fs to release any per-inode data it holds
 366 static void yaffs_clear_inode(struct inode *inode)
 367 {
 368         yaffs_Object *obj;
 369         yaffs_Device *dev;
 370
 371         obj = yaffs_InodeToObject(inode);
 372
 373         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 374                 obj ? "object exists" : "null object"));
 375
 376         if(obj)
 377         {
 378                 dev = obj->myDev;
 379                 yaffs_GrossLock(dev);
 380
 381                 // Clear the association between the inode ant the yaffs_Object.
 382                 obj->myInode = NULL;
 383                 inode->u.generic_ip = NULL;
 384
 385                 // If the object freeing was deferred, then the real free happens now.
 386                 // This should fix the inode inconsistency problem.
 387
 388                 yaffs_HandleDeferedFree(obj);
 389
 390                 yaffs_GrossUnlock(dev);
 391         }
 392
 393
 394 }
 395
 396 // delete is called when the link count is zero and the inode
 397 // is put (ie. nobody wants to know about it anymore, time to
 398 // delete the file).
 399 // NB Must call clear_inode()
 400 static void yaffs_delete_inode(struct inode *inode)
 401 {
 402         yaffs_Object *obj = yaffs_InodeToObject(inode);
 403         yaffs_Device *dev;
 404
 405         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 406                 obj ? "object exists" : "null object"));
 407
 408         if(obj)
 409         {
 410                 dev = obj->myDev;
 411                 yaffs_GrossLock(dev);
 412                 yaffs_DeleteFile(obj);
 413                 yaffs_GrossUnlock(dev);
 414         }
 415         clear_inode(inode);
 416 }
 417
 418
 419 static int yaffs_file_flush(struct file* file)
 420 {
 421         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 422
 423         yaffs_Device *dev = obj->myDev;
 424
 425         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 426                                 obj->dirty ? "dirty" : "clean"));
 427
 428         yaffs_GrossLock(dev);
 429
 430     yaffs_FlushFile(obj,1);
 431
 432         yaffs_GrossUnlock(dev);
 433
 434     return 0;
 435 }
 436
 437
 438
 439 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 440 {
 441         // Lifted from jffs2
 442
 443         yaffs_Object *obj;
 444         unsigned char *pg_buf;
 445         int ret;
 446
 447         yaffs_Device *dev;
 448
 449         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 450                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 451
 452         obj  = yaffs_DentryToObject(f->f_dentry);
 453
 454         dev = obj->myDev;
 455
 456
 457         if (!PageLocked(pg))
 458                 PAGE_BUG(pg);
 459
 460         pg_buf = kmap(pg);
 461         /* FIXME: Can kmap fail? */
 462
 463         yaffs_GrossLock(dev);
 464
 465         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 466
 467         yaffs_GrossUnlock(dev);
 468
 469         if(ret >= 0) ret = 0;
 470
 471         if (ret) {
 472                 ClearPageUptodate(pg);
 473                 SetPageError(pg);
 474         } else {
 475                 SetPageUptodate(pg);
 476                 ClearPageError(pg);
 477         }
 478
 479         flush_dcache_page(pg);
 480         kunmap(pg);
 481
 482
 483         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
 484         return ret;
 485 }
 486
 487 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 488 {
 489         int ret = yaffs_readpage_nolock(f,pg);
 490         UnlockPage(pg);
 491         return ret;
 492 }
 493
 494 static int yaffs_readpage(struct file *f, struct page * pg)
 495 {
 496         return yaffs_readpage_unlock(f,pg);
 497 }
 498
 499 // writepage inspired by/stolen from smbfs
 500 //
 501
 502 static int yaffs_writepage(struct page *page)
 503 {
 504         struct address_space *mapping = page->mapping;
 505         struct inode *inode;
 506         unsigned long end_index;
 507         char *buffer;
 508         yaffs_Object *obj;
 509         int nWritten = 0;
 510         unsigned nBytes;
 511
 512         if (!mapping)
 513                 BUG();
 514         inode = mapping->host;
 515         if (!inode)
 516                 BUG();
 517
 518         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 519
 520         /* easy case */
 521         if (page->index < end_index)
 522         {
 523                 nBytes = PAGE_CACHE_SIZE;
 524         }
 525         else
 526         {
 527                 nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
 528         }
 529         //  What's happening here?
 530         ///* OK, are we completely out? */
 531         //if (page->index >= end_index+1 || !offset)
 532         //      return -EIO;
 533
 534         get_page(page);
 535
 536
 537         buffer = kmap(page);
 538
 539         obj = yaffs_InodeToObject(inode);
 540         yaffs_GrossLock(obj->myDev);
 541
 542
 543         nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes);
 544
 545         yaffs_GrossUnlock(obj->myDev);
 546
 547         kunmap(page);
 548         SetPageUptodate(page);
 549         UnlockPage(page);
 550         put_page(page);
 551
 552         return (nWritten == nBytes) ? 0  : -ENOSPC;
 553 }
 554
 555
 556
 557 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 558 {
 559
 560         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
 561         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 562                 return  yaffs_readpage_nolock(f,pg);
 563
 564         return 0;
 565
 566 }
 567
 568 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 569 {
 570
 571         void *addr = page_address(pg) + offset;
 572         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 573         int nBytes = to - offset;
 574         int nWritten;
 575
 576         unsigned spos = pos;
 577         unsigned saddr = (unsigned)addr;
 578
 579         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 580
 581         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 582
 583         if(nWritten != nBytes)
 584         {
 585                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 586                 SetPageError(pg);
 587                 ClearPageUptodate(pg);
 588         }
 589         else
 590         {
 591                 SetPageUptodate(pg);
 592         }
 593
 594         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 595
 596         return nWritten;
 597
 598 }
 599
 600
 601
 602 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 603 {
 604         if (inode && obj)
 605         {
 606                 inode->i_ino = obj->objectId;
 607                 inode->i_mode = obj->st_mode;
 608                 inode->i_uid = obj->st_uid;
 609                 inode->i_gid = obj->st_gid;
 610                 inode->i_blksize = inode->i_sb->s_blocksize;
 611 //#if defined(CONFIG_KERNEL_2_5)
 612 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 613
 614                 inode->i_rdev = old_decode_dev(obj->st_rdev);
 615                 inode->i_atime.tv_sec = (time_t)(obj->st_atime);
 616                 inode->i_atime.tv_nsec = 0;
 617                 inode->i_mtime.tv_sec = (time_t)obj->st_mtime;
 618                 inode->i_mtime.tv_nsec =0;
 619                 inode->i_ctime.tv_sec = (time_t)obj->st_ctime;
 620                 inode->i_ctime.tv_nsec = 0;
 621 #else
 622                 inode->i_rdev = obj->st_rdev;
 623                 inode->i_atime = obj->st_atime;
 624                 inode->i_mtime = obj->st_mtime;
 625                 inode->i_ctime = obj->st_ctime;
 626 #endif
 627                 inode->i_size = yaffs_GetObjectFileLength(obj);
 628                 inode->i_blocks = (inode->i_size + 511) >> 9;
 629
 630                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 631
 632                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 633                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 634
 635                 switch (obj->st_mode & S_IFMT)
 636                 {
 637                         default: // fifo, device or socket
 638                                 init_special_inode(inode, obj->st_mode,(dev_t)(obj->st_rdev));
 639                                 break;
 640                         case S_IFREG:   // file
 641                                 inode->i_op = &yaffs_file_inode_operations;
 642                                 inode->i_fop = &yaffs_file_operations;
 643                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 644                                 break;
 645                         case S_IFDIR:   // directory
 646                                 inode->i_op = &yaffs_dir_inode_operations;
 647                                 inode->i_fop = &yaffs_dir_operations;
 648                                 break;
 649                         case S_IFLNK:   // symlink
 650                                 inode->i_op = &yaffs_symlink_inode_operations;
 651                                 break;
 652                 }
 653
 654
 655                 inode->u.generic_ip = obj;
 656                 obj->myInode = inode;
 657
 658         }
 659         else
 660         {
 661                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 662         }
 663
 664 }
 665
 666 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 667 {
 668         struct inode * inode;
 669
 670         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 671
 672         inode = iget(sb,obj->objectId);
 673
 674         // NB Side effect: iget calls back to yaffs_read_inode().
 675         // iget also increments the inode's i_count
 676
 677         return inode;
 678 }
 679
 680 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 681 {
 682         yaffs_Object *obj;
 683         int nRead,ipos;
 684         struct inode *inode;
 685         yaffs_Device *dev;
 686
 687         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n"));
 688
 689         obj  = yaffs_DentryToObject(f->f_dentry);
 690
 691         dev = obj->myDev;
 692
 693         yaffs_GrossLock(dev);
 694
 695         inode = f->f_dentry->d_inode;
 696
 697         if (*pos < inode->i_size)
 698         {
 699                         if (*pos + n > inode->i_size)
 700                         {
 701                                 n = inode->i_size - *pos;
 702                         }
 703         }
 704         else
 705         {
 706                 n = 0;
 707         }
 708
 709         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 710         if(nRead > 0)
 711         {
 712                 f->f_pos += nRead;
 713         }
 714
 715         yaffs_GrossUnlock(dev);
 716
 717         ipos = *pos;
 718
 719         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 720         return nRead;
 721
 722 }
 723
 724
 725 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 726 {
 727         yaffs_Object *obj;
 728         int nWritten,ipos;
 729         struct inode *inode;
 730         yaffs_Device *dev;
 731
 732
 733         obj  = yaffs_DentryToObject(f->f_dentry);
 734
 735         dev = obj->myDev;
 736
 737         yaffs_GrossLock(dev);
 738
 739         inode = f->f_dentry->d_inode;
 740
 741         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 742         {
 743                 ipos = inode->i_size;
 744         }
 745         else
 746         {
 747                 ipos = *pos;
 748         }
 749
 750
 751         if(!obj)
 752         {
 753                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 754         }
 755         else
 756         {
 757                 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));
 758         }
 759
 760         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n);
 761
 762         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 763         if(nWritten > 0)
 764         {
 765                 ipos += nWritten;
 766                 *pos = ipos;
 767                 if(ipos > inode->i_size)
 768                 {
 769                         inode->i_size = ipos;
 770                         inode->i_blocks = (ipos + 511)>>9;
 771
 772                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 773                 }
 774
 775         }
 776         yaffs_GrossUnlock(dev);
 777
 778         return nWritten != n ? -ENOSPC : nWritten;
 779 }
 780
 781
 782 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 783 {
 784         yaffs_Object *obj;
 785         yaffs_Device *dev;
 786         struct inode *inode = f->f_dentry->d_inode;
 787         unsigned long offset, curoffs;
 788         struct list_head *i;
 789         yaffs_Object *l;
 790
 791         char name[YAFFS_MAX_NAME_LENGTH +1];
 792
 793         obj =  yaffs_DentryToObject(f->f_dentry);
 794         dev = obj->myDev;
 795
 796         yaffs_GrossLock(dev);
 797
 798         offset = f->f_pos;
 799
 800         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 801
 802         if(offset == 0)
 803         {
 804         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 805                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 806                 {
 807                         goto out;
 808                 }
 809                 offset++;
 810                 f->f_pos++;
 811         }
 812         if(offset == 1)
 813         {
 814                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 815                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 816                 {
 817                         goto out;
 818                 }
 819                 offset++;
 820                 f->f_pos++;
 821         }
 822
 823         curoffs = 1;
 824
 825         list_for_each(i,&obj->variant.directoryVariant.children)
 826         {
 827                 curoffs++;
 828                 if(curoffs >= offset)
 829                 {
 830                         l = list_entry(i, yaffs_Object,siblings);
 831
 832                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 833                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 834
 835                         if(filldir(dirent,
 836                                            name,
 837                                            strlen(name),
 838                                            offset,
 839                                            yaffs_GetObjectInode(l),
 840                                            yaffs_GetObjectType(l))
 841                                            < 0)
 842                         {
 843                                 goto up_and_out;
 844                         }
 845
 846                         offset++;
 847                         f->f_pos++;
 848                 }
 849         }
 850
 851   up_and_out:
 852   out:
 853
 854     yaffs_GrossUnlock(dev);
 855
 856         return 0;
 857 }
 858
 859
 860 /*
 861  * File creation. Allocate an inode, and we're done..
 862  */
 863 //#if defined(CONFIG_KERNEL_2_5)
 864 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 865 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 866 #else
 867 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 868 #endif
 869 {
 870         struct inode *inode;
 871
 872         yaffs_Object *obj = NULL;
 873         yaffs_Device *dev;
 874
 875         yaffs_Object *parent = yaffs_InodeToObject(dir);
 876
 877         int error = -ENOSPC;
 878
 879         if(parent)
 880         {
 881                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 882                                          parent->objectId,parent->variantType));
 883         }
 884         else
 885         {
 886                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 887                 return -EPERM;
 888         }
 889
 890         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 891                                         dentry->d_name.name, mode,rdev));
 892
 893         dev = parent->myDev;
 894
 895         yaffs_GrossLock(dev);
 896
 897         switch (mode & S_IFMT)
 898         {
 899                 default:
 900                         // Special (socket, fifo, device...)
 901                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 902                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 903                         break;
 904                 case S_IFREG:   // file
 905                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 906                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 907                         break;
 908                 case S_IFDIR:   // directory
 909                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 910                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 911                         break;
 912                 case S_IFLNK:   // symlink
 913                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 914                         obj = NULL; // Do we ever get here?
 915                         break;
 916         }
 917
 918         if(obj)
 919         {
 920                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 921                 d_instantiate(dentry, inode);
 922                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 923                 error = 0;
 924         }
 925         else
 926         {
 927                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 928                 error = -ENOMEM;
 929         }
 930
 931         yaffs_GrossUnlock(dev);
 932
 933         return error;
 934 }
 935
 936 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 937 {
 938         int retVal;
 939         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 940         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 941 #if 0
 942  // attempt to fix dir bug - didn't work
 943         if(!retVal)
 944         {
 945                 dget(dentry);
 946         }
 947 #endif
 948         return retVal;
 949 }
 950
 951 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
 952 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 953 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
 954 #else
 955 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 956 #endif
 957 {
 958         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
 959         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 960 }
 961
 962
 963 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 964 {
 965         int retVal;
 966
 967         yaffs_Device *dev;
 968
 969
 970         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
 971
 972         dev = yaffs_InodeToObject(dir)->myDev;
 973
 974         yaffs_GrossLock(dev);
 975
 976
 977         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
 978
 979
 980         yaffs_GrossUnlock(dev);
 981
 982         if( retVal == YAFFS_OK)
 983         {
 984                 dentry->d_inode->i_nlink--;
 985                 mark_inode_dirty(dentry->d_inode);
 986                 return 0;
 987         }
 988         else
 989         {
 990                 return -ENOTEMPTY;
 991         }
 992 }
 993
 994
 995 /*
 996  * Create a link...
 997  */
 998 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
 999 {
1000         struct inode *inode = old_dentry->d_inode;
1001         yaffs_Object *obj = NULL;
1002         yaffs_Object *link=NULL;
1003         yaffs_Device *dev;
1004
1005         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
1006
1007         obj = yaffs_InodeToObject(inode);
1008         dev = obj->myDev;
1009
1010         yaffs_GrossLock(dev);
1011
1012         if (!S_ISDIR(inode->i_mode))    // Don't link directories
1013         {
1014                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
1015         }
1016
1017
1018         if(link)
1019         {
1020                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
1021                 d_instantiate(dentry, old_dentry->d_inode);
1022                 atomic_inc(&old_dentry->d_inode->i_count);
1023                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
1024                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
1025
1026         }
1027
1028         yaffs_GrossUnlock(dev);
1029
1030
1031         if(link)
1032         {
1033
1034                 return 0;
1035         }
1036
1037
1038         return -EPERM;
1039 }
1040
1041
1042 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
1043 {
1044         yaffs_Object *obj;
1045         yaffs_Device *dev;
1046
1047         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
1048
1049         dev = yaffs_InodeToObject(dir)->myDev;
1050         yaffs_GrossLock(dev);
1051         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1052                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
1053                                                          symname);
1054         yaffs_GrossUnlock(dev);
1055
1056         if(obj)
1057         {
1058
1059                 struct inode* inode;
1060
1061                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode, 0, obj);
1062                 d_instantiate(dentry, inode);
1063                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
1064                 return 0;
1065         }
1066         else
1067         {
1068                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
1069
1070         }
1071
1072         return -ENOMEM;
1073 }
1074
1075 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
1076 {
1077
1078         yaffs_Object *obj;
1079         yaffs_Device *dev;
1080
1081         obj = yaffs_DentryToObject(dentry);
1082
1083         dev = obj->myDev;
1084
1085         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
1086         yaffs_GrossLock(dev);
1087         yaffs_FlushFile(obj,1);
1088         yaffs_GrossUnlock(dev);
1089         return 0;
1090 }
1091
1092 /*
1093  * The VFS layer already does all the dentry stuff for rename.
1094  *
1095  * NB: POSIX says you can rename an object over an old object of the same name
1096  */
1097 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1098 {
1099         yaffs_Device *dev;
1100         int retVal = YAFFS_FAIL;
1101         int removed = 0;
1102         yaffs_Object *target;
1103
1104         dev = yaffs_InodeToObject(old_dir)->myDev;
1105
1106         yaffs_GrossLock(dev);
1107
1108         // Check if the target is an existing directory that is not empty.
1109         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1110
1111         if(target &&
1112            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1113            !list_empty(&target->variant.directoryVariant.children))
1114         {
1115                 retVal = YAFFS_FAIL;
1116         }
1117         else
1118         {
1119
1120                 // Unlink the target if it exists
1121                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1122
1123
1124                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1125                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1126
1127         }
1128         yaffs_GrossUnlock(dev);
1129
1130         if(retVal == YAFFS_OK)
1131         {
1132                 if(removed == YAFFS_OK)
1133                 {
1134                         new_dentry->d_inode->i_nlink--;
1135                         mark_inode_dirty(new_dentry->d_inode);
1136                 }
1137
1138                 return 0;
1139         }
1140         else
1141         {
1142                 return -ENOTEMPTY;
1143         }
1144
1145
1146 }
1147
1148 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1149 {
1150         struct inode *inode = dentry->d_inode;
1151         int error;
1152         yaffs_Device *dev;
1153
1154         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1155
1156         if((error = inode_change_ok(inode,attr)) == 0)
1157         {
1158
1159                 dev = yaffs_InodeToObject(inode)->myDev;
1160                 yaffs_GrossLock(dev);
1161                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1162                 {
1163                         error = 0;
1164                 }
1165                 else
1166                 {
1167                         error = -EPERM;
1168                 }
1169                 yaffs_GrossUnlock(dev);
1170                 inode_setattr(inode,attr);
1171         }
1172         return error;
1173 }
1174
1175 //#if defined(CONFIG_KERNEL_2_5)        /* Added NCB 185-8-2003 */
1176 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1177 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1178 #else
1179 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1180 #endif
1181 {
1182         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1183         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1184
1185         yaffs_GrossLock(dev);
1186
1187         buf->f_type = YAFFS_MAGIC;
1188         buf->f_bsize = sb->s_blocksize;
1189         buf->f_namelen = 255;
1190         buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * YAFFS_CHUNKS_PER_BLOCK/
1191                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1192         buf->f_files = 0;
1193         buf->f_ffree = 0;
1194         buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1195                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1196         buf->f_bavail =  buf->f_bfree;
1197
1198         yaffs_GrossUnlock(dev);
1199         return 0;
1200 }
1201
1202 static void yaffs_read_inode (struct inode *inode)
1203 {
1204         // NB This is called as a side effect of other functions and
1205         // thus gross locking should always be in place already.
1206
1207         yaffs_Object *obj ;
1208         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1209
1210         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1211
1212         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1213
1214         yaffs_FillInodeFromObject(inode,obj);
1215
1216 }
1217
1218
1219
1220 static yaffs_Device *yaffs_dev;
1221 static yaffs_Device *yaffsram_dev;
1222
1223
1224
1225 static void yaffs_put_super(struct super_block *sb)
1226 {
1227         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1228
1229         yaffs_GrossLock(dev);
1230         if(dev->putSuperFunc)
1231         {
1232                  dev->putSuperFunc(sb);
1233         }
1234         yaffs_Deinitialise(dev);
1235         yaffs_GrossUnlock(dev);
1236
1237         if(dev == yaffs_dev) yaffs_dev = NULL;
1238         if(dev == yaffsram_dev) yaffsram_dev = NULL;
1239
1240         kfree(dev);
1241 }
1242
1243
1244 #ifdef CONFIG_YAFFS_MTD_ENABLED
1245
1246 static void  yaffs_MTDPutSuper(struct super_block *sb)
1247 {
1248
1249         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1250
1251         if(mtd->sync)
1252         {
1253                 mtd->sync(mtd);
1254         }
1255
1256         put_mtd_device(mtd);
1257 }
1258
1259 #endif
1260
1261
1262 static struct super_block *yaffs_internal_read_super(int useRam, struct super_block * sb, void * data, int silent)
1263 {
1264         int nBlocks;
1265         struct inode * inode;
1266         struct dentry * root;
1267         yaffs_Device *dev;
1268
1269         sb->s_magic = YAFFS_MAGIC;
1270         sb->s_op = &yaffs_super_ops;
1271
1272         if(!sb)
1273                 printk(KERN_INFO"yaffs: sb is NULL\n");
1274         else if(!sb->s_dev)
1275                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1276         else if(! kdevname(sb->s_dev))
1277                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1278         else
1279                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1280
1281
1282
1283 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1284         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1285         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1286 #else
1287         sb->s_blocksize = PAGE_CACHE_SIZE;
1288         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1289 #endif
1290         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1291
1292 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1293         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1294 #endif
1295
1296
1297
1298         if(useRam)
1299         {
1300
1301 #ifdef CONFIG_YAFFS_RAM_ENABLED
1302                 // Set the yaffs_Device up for ram emulation
1303
1304                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1305                 if(!dev)
1306                 {
1307                         // Deep shit could not allocate device structure
1308                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1309                         return NULL;
1310                 }
1311
1312                 memset(dev,0,sizeof(yaffs_Device));
1313                 dev->genericDevice = NULL; // Not used for RAM emulation.
1314
1315                 nBlocks = YAFFS_RAM_EMULATION_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
1322                 dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1323                 dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1324                 dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1325                 dev->initialiseNAND = nandemul_InitialiseNAND;
1326
1327                 yaffsram_dev = dev;
1328
1329 #endif
1330
1331         }
1332         else
1333         {
1334 #ifdef CONFIG_YAFFS_MTD_ENABLED
1335                 struct mtd_info *mtd;
1336
1337                 printk(KERN_DEBUG "yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1338                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev));
1339
1340                 // Check it's an mtd device.....
1341                 if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1342                 {
1343                         return NULL; // This isn't an mtd device
1344                 }
1345
1346                 // Get the device
1347                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1348                 if (!mtd)
1349                 {
1350                         printk(KERN_DEBUG "yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev));
1351                         return NULL;
1352                 }
1353
1354                 // Check it's NAND
1355                 if(mtd->type != MTD_NANDFLASH)
1356                 {
1357                         printk(KERN_DEBUG "yaffs: MTD device is not NAND it's type %d\n", mtd->type);
1358                         return NULL;
1359                 }
1360
1361                 //printk(KERN_DEBUG" erase %x\n",mtd->erase);
1362                 //printk(KERN_DEBUG" read %x\n",mtd->read);
1363                 //printk(KERN_DEBUG" write %x\n",mtd->write);
1364                 //printk(KERN_DEBUG" readoob %x\n",mtd->read_oob);
1365                 //printk(KERN_DEBUG" writeoob %x\n",mtd->write_oob);
1366                 //printk(KERN_DEBUG" oobblock %x\n",mtd->oobblock);
1367                 //printk(KERN_DEBUG" oobsize %x\n",mtd->oobsize);
1368
1369
1370                 if(!mtd->erase ||
1371                    !mtd->read  ||
1372                    !mtd->write ||
1373 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1374                    !mtd->write_ecc ||
1375                    !mtd->read_ecc ||
1376 #endif
1377                    !mtd->read_oob ||
1378                    !mtd->write_oob )
1379                 {
1380                         printk(KERN_DEBUG "yaffs: MTD device does not support required functions\n");
1381                         return NULL;
1382                 }
1383
1384                 if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1385                    mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1386                 {
1387                         printk(KERN_DEBUG "yaffs: MTD device does not support have the right page sizes\n");
1388                         return NULL;
1389                 }
1390
1391
1392                 // OK, so if we got here, we have an MTD that's NAND and looks
1393                 // like it has the right capabilities
1394                 // Set the yaffs_Device up for ram emulation
1395
1396 //#if defined(CONFIG_KERNEL_2_5)
1397 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1398                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1399 #else
1400                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1401 #endif
1402                 if(!dev)
1403                 {
1404                         // Deep shit could not allocate device structure
1405                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1406                         return NULL;
1407                 }
1408
1409                 memset(dev,0,sizeof(yaffs_Device));
1410                 dev->genericDevice = mtd;
1411
1412                 // Set up the memory size parameters....
1413
1414                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1415                 dev->startBlock = 1;  // Don't use block 0
1416                 dev->endBlock = nBlocks - 1;
1417                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1418                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1419                 dev->nReservedBlocks = 5;
1420                 dev->nShortOpCaches = 10; // Enable short op caching
1421
1422
1423                 // ... and the functions.
1424                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1425                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1426                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1427                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1428
1429                 dev->putSuperFunc = yaffs_MTDPutSuper;
1430
1431 #ifdef CONFIG_YAFFS_USE_NANDECC
1432                 dev->useNANDECC = 1;
1433 #endif
1434
1435                 yaffs_dev = dev;
1436
1437 #endif
1438         }
1439
1440         init_MUTEX(&dev->grossLock);
1441
1442
1443         yaffs_GrossLock(dev);
1444         yaffs_GutsInitialise(yaffs_SuperToDevice(sb));
1445
1446         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised\n"));
1447
1448         // Create root inode
1449         inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(yaffs_SuperToDevice(sb)));
1450
1451         yaffs_GrossUnlock(dev);
1452
1453         if (!inode)
1454                 return NULL;
1455
1456 // added NCB
1457         inode->i_op = & yaffs_dir_inode_operations;
1458         inode->i_fop = & yaffs_dir_operations;
1459
1460         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1461
1462
1463         root = d_alloc_root(inode);
1464
1465         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1466
1467         if (!root) {
1468                 iput(inode);
1469                 return NULL;
1470         }
1471         sb->s_root = root;
1472
1473         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1474         return sb;
1475 }
1476
1477 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1478 {
1479          return yaffs_internal_read_super(1,sb,data,silent) ? 0 : -1;
1480 }
1481 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1482 {
1483          return yaffs_internal_read_super(0,sb,data,silent) ? 0 : -1;
1484 }
1485
1486
1487 #ifdef CONFIG_YAFFS_MTD_ENABLED
1488 //#if defined(CONFIG_KERNEL_2_5)
1489 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1490 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1491 {
1492
1493     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1494 }
1495
1496 /* changes NCB 2.5.70 */
1497 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1498 static struct file_system_type yaffs_fs_type = {
1499         .owner          = THIS_MODULE,
1500         .name           = "yaffs",
1501         .get_sb         = yaffs_read_super,
1502 //      .kill_sb        = kill_block_super,
1503         .kill_sb        = kill_litter_super,
1504         .fs_flags       = FS_REQUIRES_DEV,
1505 };
1506 #else
1507 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1508 {
1509         return yaffs_internal_read_super(0,sb,data,silent);
1510 }
1511
1512 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1513 #endif
1514 #endif
1515
1516 #ifdef CONFIG_YAFFS_RAM_ENABLED
1517
1518 //#if defined(CONFIG_KERNEL_2_5)
1519 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1520 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1521 {
1522
1523     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_ram);
1524 }
1525
1526 /* changes NCB 2.5.70 */
1527 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1528 static struct file_system_type yaffs_fs_type = {
1529         .owner          = THIS_MODULE,
1530         .name           = "yaffsram",
1531         .get_sb         = yaffs_ram_read_super,
1532 //      .kill_sb        = kill_block_super,
1533         .kill_sb        = kill_litter_super,
1534         .fs_flags       = FS_SINGLE,
1535 };
1536 #else
1537 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1538 {
1539         return yaffs_internal_read_super(1,sb,data,silent);
1540 }
1541
1542 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1543 #endif
1544 #endif // CONFIG_YAFFS_RAM_ENABLED
1545
1546
1547 static struct proc_dir_entry *my_proc_entry;
1548 static struct proc_dir_entry *my_proc_ram_write_entry;
1549
1550 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
1551 {
1552         buf +=sprintf(buf,"\nDevice %s\n",name);
1553         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1554         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1555         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1556         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1557         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1558         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1559         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1560         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1561         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1562         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1563         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1564         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1565         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1566         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1567         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1568         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1569         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1570         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1571         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1572         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1573         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1574         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1575         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1576         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1577         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1578         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1579         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1580
1581
1582         return buf;
1583 }
1584
1585 static int  yaffs_proc_read(
1586         char *page,
1587         char **start,
1588         off_t offset,
1589         int count,
1590         int *eof,
1591         void *data
1592         )
1593 {
1594
1595         char my_buffer[3000];
1596         char *buf;
1597         buf = my_buffer;
1598
1599         if (offset > 0) return 0;
1600
1601         /* Fill the buffer and get its length */
1602         buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
1603
1604         if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
1605         if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
1606
1607
1608         strcpy(page,my_buffer);
1609         return strlen(my_buffer);
1610 }
1611
1612
1613 static int  yaffs_proc_ram_write(
1614         char *page,
1615         char **start,
1616         off_t offset,
1617         int count,
1618         int *eof,
1619         void *data
1620         )
1621 {
1622
1623         printk(KERN_DEBUG "yaffs write size %d\n",count);
1624         return count;
1625 }
1626
1627 static int __init init_yaffs_fs(void)
1628 {
1629         int error = 0;
1630
1631         yaffs_dev = yaffsram_dev = NULL;
1632
1633         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Initialisation\n");
1634 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
1635         printk(KERN_DEBUG "yaffs is using generic read/write (caching)\n");
1636 #else
1637         printk(KERN_DEBUG "yaffs is using direct read/write (uncached)\n");
1638 #endif
1639
1640
1641     /* Install the proc_fs entry */
1642     my_proc_entry = create_proc_read_entry("yaffs",
1643                                            S_IRUGO | S_IFREG,
1644                                            &proc_root,
1645                                            yaffs_proc_read,
1646                                            NULL);
1647     if(!my_proc_entry)
1648     {
1649        return -ENOMEM;
1650     }
1651
1652 #ifdef CONFIG_YAFFS_RAM_ENABLED
1653 #if 0
1654     my_proc_ram_write_entry = create_proc_entry("yaffs_ram",
1655                                            S_IRUGO | S_IFREG,
1656                                            &proc_root);
1657
1658     if(!my_proc_ram_write_entry)
1659     {
1660        return -ENOMEM;
1661     }
1662     else
1663     {
1664         my_proc_ram_write_entry->write_proc = yaffs_proc_ram_write;
1665     }
1666 #endif
1667
1668     error = register_filesystem(&yaffs_ram_fs_type);
1669     if(error)
1670     {
1671         return error;
1672     }
1673 #endif //CONFIG_YAFFS_RAM_ENABLED
1674
1675 #ifdef CONFIG_YAFFS_MTD_ENABLED
1676         error = register_filesystem(&yaffs_fs_type);
1677         if(error)
1678         {
1679 #ifdef CONFIG_YAFFS_RAM_ENABLED
1680                 unregister_filesystem(&yaffs_ram_fs_type);
1681 #endif //CONFIG_YAFFS_RAM_ENABLED
1682         }
1683 #endif // CONFIG_YAFFS_MTD_ENABLED
1684
1685         return error;
1686 }
1687
1688 static void __exit exit_yaffs_fs(void)
1689 {
1690         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Clean up\n");
1691
1692     remove_proc_entry("yaffs",&proc_root);
1693
1694 #ifdef CONFIG_YAFFS_RAM_ENABLED
1695         unregister_filesystem(&yaffs_ram_fs_type);
1696 #endif
1697 #ifdef CONFIG_YAFFS_MTD_ENABLED
1698         unregister_filesystem(&yaffs_fs_type);
1699 #endif
1700
1701 }
1702
1703 module_init(init_yaffs_fs)
1704 module_exit(exit_yaffs_fs)
1705
1706 MODULE_DESCRIPTION("YAFFS - a NAND specific flash file system");
1707 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002");
1708 MODULE_LICENSE("GPL");
1709