yaffs_fs.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  * yaffs_fs.c
   4  *
   5  * Copyright (C) 2002 Aleph One Ltd.
   6  *   for Toby Churchill Ltd and Brightstar Engineering
   7  *
   8  * Created by Charles Manning <charles@aleph1.co.uk>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * This is the file system front-end to YAFFS that hooks it up to
  15  * the VFS.
  16  *
  17  * Special notes:
  18  * >> sb->u.generic_sbp points to the yaffs_Device associated with this superblock
  19  * >> inode->u.generic_ip points to the associated yaffs_Object.
  20  *
  21  *
  22  * Acknowledgements:
  23  * * Luc van OostenRyck for numerous patches.
  24  * * Nick Bane for numerous patches.
  25  * * Nick Bane for 2.5/2.6 integration.
  26  * * Andras Toth for mknod rdev issue.
  27  * * Some code bodily lifted from JFFS2.
  28  */
  29
  30
  31 const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.30 2003-09-20 01:13:48 charles Exp $";
  32 extern const char *yaffs_guts_c_version;
  33
  34
  35 #include <linux/config.h>
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/version.h>
  39 #include <linux/slab.h>
  40 #include <linux/init.h>
  41 #include <linux/list.h>
  42 #include <linux/fs.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/pagemap.h>
  45 #include <linux/mtd/mtd.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/string.h>
  48
  49
  50 #if defined(CONFIG_KERNEL_2_5)
  51 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  52 #include <asm/statfs.h>
  53 #define UnlockPage(p) unlock_page(p)
  54 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  55 #define kdevname(x) cdevname(to_kdev_t(x))
  56 #else
  57 #include <linux/locks.h>
  58 #endif
  59
  60
  61 #include <asm/uaccess.h>
  62
  63 #include "yportenv.h"
  64 #include "yaffs_guts.h"
  65
  66
  67
  68
  69 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
  70
  71 #ifdef CONFIG_YAFFS_RAM_ENABLED
  72 #include "yaffs_nandemul.h"
  73 // 2 MB of RAM for emulation
  74 #define YAFFS_RAM_EMULATION_SIZE  0x200000
  75 #endif //CONFIG_YAFFS_RAM_ENABLED
  76
  77 #ifdef CONFIG_YAFFS_MTD_ENABLED
  78 #include <linux/mtd/mtd.h>
  79 #include "yaffs_mtdif.h"
  80 #endif //CONFIG_YAFFS_MTD_ENABLED
  81
  82 //#define T(x) printk x
  83
  84
  85
  86 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
  87 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
  88 //NCB #define yaffs_SuperToDevice(sb)   ((yaffs_Device *)sb->u.generic_sbp)
  89
  90 #if defined(CONFIG_KERNEL_2_5)
  91 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
  92 #else
  93 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
  94 #endif
  95
  96
  97 static void yaffs_put_super(struct super_block *sb);
  98
  99 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos);
 100 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
 101 static int yaffs_file_flush(struct file* file);
 102
 103 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
 104
 105 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 106
 107 #if defined(CONFIG_KERNEL_2_5)  /* Added NCB 185-8-2003 */
 108 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n);
 109 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n);
 110 #else
 111 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 112 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
 113 #endif
 114 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
 115 static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
 116 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
 117 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
 118
 119 #if defined(CONFIG_KERNEL_2_5)
 120 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
 121 #else
 122 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
 123 #endif
 124 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
 125 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 126
 127 #if defined(CONFIG_KERNEL_2_5)  /* Added NCB 185-8-2003 */
 128 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 129 #else
 130 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 131 #endif
 132 static void yaffs_read_inode (struct inode *inode);
 133
 134 #if defined(CONFIG_KERNEL_2_5)
 135 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data);
 136 #else
 137 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent);
 138 #endif
 139
 140 static void yaffs_put_inode (struct inode *inode);
 141 static void yaffs_delete_inode(struct inode *);
 142 static void yaffs_clear_inode(struct inode *);
 143
 144 static int yaffs_readpage(struct file *file, struct page * page);
 145
 146 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 147 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 148
 149 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen);
 150 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 151
 152
 153
 154
 155 static struct address_space_operations yaffs_file_address_operations = {
 156         readpage:               yaffs_readpage,
 157         prepare_write:  yaffs_prepare_write,
 158         commit_write:   yaffs_commit_write
 159 };
 160
 161
 162 static struct file_operations yaffs_file_operations = {
 163 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
 164         read:           generic_file_read,
 165         write:          generic_file_write,
 166 #else
 167         read:           yaffs_file_read,
 168         write:          yaffs_file_write,
 169 #endif
 170         mmap:           generic_file_mmap,
 171         flush:          yaffs_file_flush,
 172         fsync:          yaffs_sync_object,
 173 };
 174
 175
 176 static struct inode_operations yaffs_file_inode_operations = {
 177         setattr:        yaffs_setattr,
 178 };
 179
 180
 181 struct inode_operations yaffs_symlink_inode_operations =
 182 {
 183         readlink:       yaffs_readlink,
 184         follow_link:    yaffs_follow_link,
 185         setattr:        yaffs_setattr
 186 };
 187
 188 static struct inode_operations yaffs_dir_inode_operations = {
 189         create:         yaffs_create,
 190         lookup:         yaffs_lookup,
 191         link:           yaffs_link,
 192         unlink:         yaffs_unlink,
 193         symlink:        yaffs_symlink,
 194         mkdir:          yaffs_mkdir,
 195         rmdir:          yaffs_unlink,
 196         mknod:          yaffs_mknod,
 197         rename:         yaffs_rename,
 198         setattr:        yaffs_setattr,
 199 };
 200
 201 static struct file_operations yaffs_dir_operations = {
 202         read:           generic_read_dir,
 203         readdir:        yaffs_readdir,
 204         fsync:          yaffs_sync_object,
 205 };
 206
 207
 208 static struct super_operations yaffs_super_ops = {
 209         statfs:                 yaffs_statfs,
 210         read_inode:             yaffs_read_inode,
 211         put_inode:              yaffs_put_inode,
 212         put_super:              yaffs_put_super,
 213 //      remount_fs:
 214         delete_inode:           yaffs_delete_inode,
 215         clear_inode:            yaffs_clear_inode,
 216 };
 217
 218
 219
 220 static void yaffs_GrossLock(yaffs_Device *dev)
 221 {
 222         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
 223
 224         down(&dev->grossLock);
 225 }
 226
 227 static void yaffs_GrossUnlock(yaffs_Device *dev)
 228 {
 229         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
 230         up(&dev->grossLock);
 231
 232 }
 233
 234 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen)
 235 {
 236         unsigned char *alias;
 237         int ret;
 238
 239         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 240
 241
 242         yaffs_GrossLock(dev);
 243
 244         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 245
 246         yaffs_GrossUnlock(dev);
 247
 248         if(!alias)
 249                 return -ENOMEM;
 250
 251         ret = vfs_readlink(dentry, buffer, buflen, alias);
 252         kfree(alias);
 253         return ret;
 254 }
 255
 256 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 257 {
 258         unsigned char *alias;
 259         int ret;
 260         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 261
 262
 263         yaffs_GrossLock(dev);
 264
 265         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 266
 267         yaffs_GrossUnlock(dev);
 268
 269         if(!alias)
 270                 return -ENOMEM;
 271
 272         ret = vfs_follow_link(nd,alias);
 273         kfree(alias);
 274         return ret;
 275 }
 276
 277
 278 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 279
 280 /*
 281  * Lookup is used to find objects in the fs
 282  */
 283 #if defined(CONFIG_KERNEL_2_5)  /* Added NCB 185-8-2003 */
 284 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 285 #else
 286 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 287 #endif
 288 {
 289         yaffs_Object *obj;
 290         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 291
 292         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 293
 294
 295         yaffs_GrossLock(dev);
 296
 297
 298         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 299
 300         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 301
 302         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 303
 304
 305
 306         if(obj)
 307         {
 308                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 309
 310                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode,0,obj);
 311
 312                 if(inode)
 313                 {
 314                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
 315 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 316 #if 0
 317                         //dget(dentry); // try to solve directory bug
 318                         d_add(dentry,inode);
 319
 320                         yaffs_GrossUnlock(dev);
 321
 322                         // return dentry;
 323                         return NULL;
 324 #endif
 325                 }
 326
 327         }
 328         else
 329         {
 330                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
 331
 332         }
 333         yaffs_GrossUnlock(dev);
 334
 335 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 336         d_add(dentry,inode);
 337
 338         return NULL;
 339         //      return (ERR_PTR(-EIO));
 340
 341 }
 342
 343 // For now put inode is just for debugging
 344 // Put inode is called when the inode **structure** is put.
 345 static void yaffs_put_inode(struct inode *inode)
 346 {
 347         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 348
 349 }
 350
 351 // clear is called to tell the fs to release any per-inode data it holds
 352 static void yaffs_clear_inode(struct inode *inode)
 353 {
 354         yaffs_Object *obj = yaffs_InodeToObject(inode);
 355
 356         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 357                 obj ? "object exists" : "null object"));
 358
 359         if(obj)
 360         {
 361                 obj->myInode = NULL;
 362                 inode->u.generic_ip = NULL;
 363         }
 364
 365
 366 }
 367
 368 // delete is called when the link count is zero and the inode
 369 // is put (ie. nobody wants to know about it anymore, time to
 370 // delete the file).
 371 // NB Must call clear_inode()
 372 static void yaffs_delete_inode(struct inode *inode)
 373 {
 374         yaffs_Object *obj = yaffs_InodeToObject(inode);
 375         yaffs_Device *dev;
 376
 377         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 378                 obj ? "object exists" : "null object"));
 379
 380         if(obj)
 381         {
 382                 dev = obj->myDev;
 383                 yaffs_GrossLock(dev);
 384                 yaffs_DeleteFile(obj);
 385                 yaffs_GrossUnlock(dev);
 386         }
 387         clear_inode(inode);
 388 }
 389
 390
 391 static int yaffs_file_flush(struct file* file)
 392 {
 393         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 394
 395         yaffs_Device *dev = obj->myDev;
 396
 397         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 398                                 obj->dirty ? "dirty" : "clean"));
 399
 400         yaffs_GrossLock(dev);
 401
 402     yaffs_FlushFile(obj,1);
 403
 404         yaffs_GrossUnlock(dev);
 405
 406     return 0;
 407 }
 408
 409
 410
 411 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 412 {
 413         // Lifted from jffs2
 414
 415         yaffs_Object *obj;
 416         unsigned char *pg_buf;
 417         int ret;
 418
 419         yaffs_Device *dev;
 420
 421         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 422                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 423
 424         obj  = yaffs_DentryToObject(f->f_dentry);
 425
 426         dev = obj->myDev;
 427
 428
 429         if (!PageLocked(pg))
 430                 PAGE_BUG(pg);
 431
 432         pg_buf = kmap(pg);
 433         /* FIXME: Can kmap fail? */
 434
 435         yaffs_GrossLock(dev);
 436
 437         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 438
 439         yaffs_GrossUnlock(dev);
 440
 441         if(ret >= 0) ret = 0;
 442
 443         if (ret) {
 444                 ClearPageUptodate(pg);
 445                 SetPageError(pg);
 446         } else {
 447                 SetPageUptodate(pg);
 448                 ClearPageError(pg);
 449         }
 450
 451         flush_dcache_page(pg);
 452         kunmap(pg);
 453
 454
 455         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
 456         return ret;
 457 }
 458
 459 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 460 {
 461         int ret = yaffs_readpage_nolock(f,pg);
 462         UnlockPage(pg);
 463         return ret;
 464 }
 465
 466 static int yaffs_readpage(struct file *f, struct page * pg)
 467 {
 468         return yaffs_readpage_unlock(f,pg);
 469 }
 470
 471
 472 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 473 {
 474
 475         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
 476         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 477                 return  yaffs_readpage_nolock(f,pg);
 478
 479         return 0;
 480
 481 }
 482
 483 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 484 {
 485
 486         void *addr = page_address(pg) + offset;
 487         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 488         int nBytes = to - offset;
 489         int nWritten;
 490
 491         unsigned spos = pos;
 492         unsigned saddr = (unsigned)addr;
 493
 494         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 495
 496         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 497
 498         if(nWritten != nBytes)
 499         {
 500                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 501                 SetPageError(pg);
 502                 ClearPageUptodate(pg);
 503         }
 504         else
 505         {
 506                 SetPageUptodate(pg);
 507         }
 508
 509         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 510
 511         return nWritten;
 512
 513 }
 514
 515
 516
 517 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 518 {
 519         if (inode && obj)
 520         {
 521                 inode->i_ino = obj->objectId;
 522                 inode->i_mode = obj->st_mode;
 523                 inode->i_uid = obj->st_uid;
 524                 inode->i_gid = obj->st_gid;
 525                 inode->i_blksize = inode->i_sb->s_blocksize;
 526 #if defined(CONFIG_KERNEL_2_5)
 527                 inode->i_rdev = to_kdev_t(obj->st_rdev);
 528                 inode->i_atime.tv_sec = (time_t)(obj->st_atime);
 529                 inode->i_atime.tv_nsec = 0;
 530                 inode->i_mtime.tv_sec = (time_t)obj->st_mtime;
 531                 inode->i_mtime.tv_nsec =0;
 532                 inode->i_ctime.tv_sec = (time_t)obj->st_ctime;
 533                 inode->i_ctime.tv_nsec = 0;
 534 #else
 535                 inode->i_rdev = obj->st_rdev;
 536                 inode->i_atime = obj->st_atime;
 537                 inode->i_mtime = obj->st_mtime;
 538                 inode->i_ctime = obj->st_ctime;
 539 #endif
 540                 inode->i_size = yaffs_GetObjectFileLength(obj);
 541                 inode->i_blocks = (inode->i_size + 511) >> 9;
 542
 543                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 544
 545                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 546                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 547
 548                 switch (obj->st_mode & S_IFMT)
 549                 {
 550                         default: // fifo, device or socket
 551                                 init_special_inode(inode, obj->st_mode,(dev_t)(obj->st_rdev));
 552                                 break;
 553                         case S_IFREG:   // file
 554                                 inode->i_op = &yaffs_file_inode_operations;
 555                                 inode->i_fop = &yaffs_file_operations;
 556                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 557                                 break;
 558                         case S_IFDIR:   // directory
 559                                 inode->i_op = &yaffs_dir_inode_operations;
 560                                 inode->i_fop = &yaffs_dir_operations;
 561                                 break;
 562                         case S_IFLNK:   // symlink
 563                                 inode->i_op = &yaffs_symlink_inode_operations;
 564                                 break;
 565                 }
 566
 567
 568                 inode->u.generic_ip = obj;
 569                 obj->myInode = inode;
 570
 571         }
 572         else
 573         {
 574                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 575         }
 576
 577 }
 578
 579 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 580 {
 581         struct inode * inode;
 582
 583         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 584
 585         inode = iget(sb,obj->objectId);
 586
 587         // NB Side effect: iget calls back to yaffs_read_inode().
 588         // iget also increments the inode's i_count
 589
 590         return inode;
 591 }
 592
 593 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 594 {
 595         yaffs_Object *obj;
 596         int nRead,ipos;
 597         struct inode *inode;
 598         yaffs_Device *dev;
 599
 600         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n"));
 601
 602         obj  = yaffs_DentryToObject(f->f_dentry);
 603
 604         dev = obj->myDev;
 605
 606         yaffs_GrossLock(dev);
 607
 608         inode = f->f_dentry->d_inode;
 609
 610         if (*pos < inode->i_size)
 611         {
 612                         if (*pos + n > inode->i_size)
 613                         {
 614                                 n = inode->i_size - *pos;
 615                         }
 616         }
 617         else
 618         {
 619                 n = 0;
 620         }
 621
 622         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 623         if(nRead > 0)
 624         {
 625                 f->f_pos += nRead;
 626         }
 627
 628         yaffs_GrossUnlock(dev);
 629
 630         ipos = *pos;
 631
 632         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 633         return nRead;
 634
 635 }
 636
 637
 638 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 639 {
 640         yaffs_Object *obj;
 641         int nWritten,ipos;
 642         struct inode *inode;
 643         yaffs_Device *dev;
 644
 645
 646         obj  = yaffs_DentryToObject(f->f_dentry);
 647
 648         dev = obj->myDev;
 649
 650         yaffs_GrossLock(dev);
 651
 652         inode = f->f_dentry->d_inode;
 653
 654         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 655         {
 656                 ipos = inode->i_size;
 657         }
 658         else
 659         {
 660                 ipos = *pos;
 661         }
 662
 663
 664         if(!obj)
 665         {
 666                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 667         }
 668         else
 669         {
 670                 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));
 671         }
 672
 673         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n);
 674
 675         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 676         if(nWritten > 0)
 677         {
 678                 ipos += nWritten;
 679                 *pos = ipos;
 680                 if(ipos > inode->i_size)
 681                 {
 682                         inode->i_size = ipos;
 683                         inode->i_blocks = (ipos + 511)>>9;
 684
 685                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 686                 }
 687
 688         }
 689         yaffs_GrossUnlock(dev);
 690
 691         return nWritten != n ? -ENOSPC : nWritten;
 692 }
 693
 694
 695 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 696 {
 697         yaffs_Object *obj;
 698         yaffs_Device *dev;
 699         struct inode *inode = f->f_dentry->d_inode;
 700         unsigned long offset, curoffs;
 701         struct list_head *i;
 702         yaffs_Object *l;
 703
 704         char name[YAFFS_MAX_NAME_LENGTH +1];
 705
 706         obj =  yaffs_DentryToObject(f->f_dentry);
 707         dev = obj->myDev;
 708
 709         yaffs_GrossLock(dev);
 710
 711         offset = f->f_pos;
 712
 713         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 714
 715         if(offset == 0)
 716         {
 717         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 718                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 719                 {
 720                         goto out;
 721                 }
 722                 offset++;
 723                 f->f_pos++;
 724         }
 725         if(offset == 1)
 726         {
 727                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 728                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 729                 {
 730                         goto out;
 731                 }
 732                 offset++;
 733                 f->f_pos++;
 734         }
 735
 736         curoffs = 1;
 737
 738         list_for_each(i,&obj->variant.directoryVariant.children)
 739         {
 740                 curoffs++;
 741                 if(curoffs >= offset)
 742                 {
 743                         l = list_entry(i, yaffs_Object,siblings);
 744
 745                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 746                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 747
 748                         if(filldir(dirent,
 749                                            name,
 750                                            strlen(name),
 751                                            offset,
 752                                            yaffs_GetObjectInode(l),
 753                                            yaffs_GetObjectType(l))
 754                                            < 0)
 755                         {
 756                                 goto up_and_out;
 757                         }
 758
 759                         offset++;
 760                         f->f_pos++;
 761                 }
 762         }
 763
 764   up_and_out:
 765   out:
 766
 767     yaffs_GrossUnlock(dev);
 768
 769         return 0;
 770 }
 771
 772
 773 /*
 774  * File creation. Allocate an inode, and we're done..
 775  */
 776 #if defined(CONFIG_KERNEL_2_5)
 777 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 778 #else
 779 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 780 #endif
 781 {
 782         struct inode *inode;
 783
 784         yaffs_Object *obj = NULL;
 785         yaffs_Device *dev;
 786
 787         yaffs_Object *parent = yaffs_InodeToObject(dir);
 788
 789         int error = -ENOSPC;
 790
 791         if(parent)
 792         {
 793                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 794                                          parent->objectId,parent->variantType));
 795         }
 796         else
 797         {
 798                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 799                 return -EPERM;
 800         }
 801
 802         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 803                                         dentry->d_name.name, mode,rdev));
 804
 805         dev = parent->myDev;
 806
 807         yaffs_GrossLock(dev);
 808
 809         switch (mode & S_IFMT)
 810         {
 811                 default:
 812                         // Special (socket, fifo, device...)
 813                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 814                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 815                         break;
 816                 case S_IFREG:   // file
 817                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 818                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 819                         break;
 820                 case S_IFDIR:   // directory
 821                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 822                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 823                         break;
 824                 case S_IFLNK:   // symlink
 825                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 826                         obj = NULL; // Do we ever get here?
 827                         break;
 828         }
 829
 830         if(obj)
 831         {
 832                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 833                 d_instantiate(dentry, inode);
 834                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 835                 error = 0;
 836         }
 837         else
 838         {
 839                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 840                 error = -ENOMEM;
 841         }
 842
 843         yaffs_GrossUnlock(dev);
 844
 845         return error;
 846 }
 847
 848 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 849 {
 850         int retVal;
 851         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 852         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 853 #if 0
 854  // attempt to fix dir bug - didn't work
 855         if(!retVal)
 856         {
 857                 dget(dentry);
 858         }
 859 #endif
 860         return retVal;
 861 }
 862
 863 #if defined(CONFIG_KERNEL_2_5)  /* Added NCB 185-8-2003 */
 864 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
 865 #else
 866 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 867 #endif
 868 {
 869         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
 870         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 871 }
 872
 873
 874 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 875 {
 876         int retVal;
 877
 878         yaffs_Device *dev;
 879
 880
 881         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
 882
 883         dev = yaffs_InodeToObject(dir)->myDev;
 884
 885         yaffs_GrossLock(dev);
 886
 887
 888         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
 889
 890
 891         yaffs_GrossUnlock(dev);
 892
 893         if( retVal == YAFFS_OK)
 894         {
 895                 dentry->d_inode->i_nlink--;
 896                 mark_inode_dirty(dentry->d_inode);
 897                 return 0;
 898         }
 899         else
 900         {
 901                 return -ENOTEMPTY;
 902         }
 903 }
 904
 905
 906 /*
 907  * Create a link...
 908  */
 909 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
 910 {
 911         struct inode *inode = old_dentry->d_inode;
 912         yaffs_Object *obj = NULL;
 913         yaffs_Object *link=NULL;
 914         yaffs_Device *dev;
 915
 916         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
 917
 918         obj = yaffs_InodeToObject(inode);
 919         dev = obj->myDev;
 920
 921         yaffs_GrossLock(dev);
 922
 923         if (!S_ISDIR(inode->i_mode))    // Don't link directories
 924         {
 925                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
 926         }
 927
 928
 929         if(link)
 930         {
 931                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
 932                 d_instantiate(dentry, old_dentry->d_inode);
 933                 atomic_inc(&old_dentry->d_inode->i_count);
 934                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
 935                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
 936
 937         }
 938
 939         yaffs_GrossUnlock(dev);
 940
 941
 942         if(link)
 943         {
 944
 945                 return 0;
 946         }
 947
 948
 949         return -EPERM;
 950 }
 951
 952
 953 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
 954 {
 955         yaffs_Object *obj;
 956         yaffs_Device *dev;
 957
 958         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
 959
 960         dev = yaffs_InodeToObject(dir)->myDev;
 961         yaffs_GrossLock(dev);
 962         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
 963                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
 964                                                          symname);
 965         yaffs_GrossUnlock(dev);
 966
 967         if(obj)
 968         {
 969
 970                 struct inode* inode;
 971
 972                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode, 0, obj);
 973                 d_instantiate(dentry, inode);
 974                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
 975                 return 0;
 976         }
 977         else
 978         {
 979                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
 980
 981         }
 982
 983         return -ENOMEM;
 984 }
 985
 986 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
 987 {
 988
 989         yaffs_Object *obj;
 990         yaffs_Device *dev;
 991
 992         obj = yaffs_DentryToObject(dentry);
 993
 994         dev = obj->myDev;
 995
 996         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
 997         yaffs_GrossLock(dev);
 998         yaffs_FlushFile(obj,1);
 999         yaffs_GrossUnlock(dev);
1000         return 0;
1001 }
1002
1003 /*
1004  * The VFS layer already does all the dentry stuff for rename.
1005  *
1006  * NB: POSIX says you can rename an object over an old object of the same name
1007  */
1008 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1009 {
1010         yaffs_Device *dev;
1011         int retVal = YAFFS_FAIL;
1012         int removed = 0;
1013         yaffs_Object *target;
1014
1015         dev = yaffs_InodeToObject(old_dir)->myDev;
1016
1017         yaffs_GrossLock(dev);
1018
1019         // Check if the target is an existing directory that is not empty.
1020         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1021
1022         if(target &&
1023            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1024            !list_empty(&target->variant.directoryVariant.children))
1025         {
1026                 retVal = YAFFS_FAIL;
1027         }
1028         else
1029         {
1030
1031                 // Unlink the target if it exists
1032                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1033
1034
1035                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1036                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1037
1038         }
1039         yaffs_GrossUnlock(dev);
1040
1041         if(retVal == YAFFS_OK)
1042         {
1043                 if(removed == YAFFS_OK)
1044                 {
1045                         new_dentry->d_inode->i_nlink--;
1046                         mark_inode_dirty(new_dentry->d_inode);
1047                 }
1048
1049                 return 0;
1050         }
1051         else
1052         {
1053                 return -ENOTEMPTY;
1054         }
1055
1056
1057 }
1058
1059 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1060 {
1061         struct inode *inode = dentry->d_inode;
1062         int error;
1063         yaffs_Device *dev;
1064
1065         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1066
1067         if((error = inode_change_ok(inode,attr)) == 0)
1068         {
1069
1070                 dev = yaffs_InodeToObject(inode)->myDev;
1071                 yaffs_GrossLock(dev);
1072                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1073                 {
1074                         error = 0;
1075                 }
1076                 else
1077                 {
1078                         error = -EPERM;
1079                 }
1080                 yaffs_GrossUnlock(dev);
1081                 inode_setattr(inode,attr);
1082         }
1083         return error;
1084 }
1085
1086 #if defined(CONFIG_KERNEL_2_5)  /* Added NCB 185-8-2003 */
1087 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1088 #else
1089 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1090 #endif
1091 {
1092         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1093         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1094
1095         yaffs_GrossLock(dev);
1096
1097         buf->f_type = YAFFS_MAGIC;
1098         buf->f_bsize = sb->s_blocksize;
1099         buf->f_namelen = 255;
1100         buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * YAFFS_CHUNKS_PER_BLOCK/
1101                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1102         buf->f_files = 0;
1103         buf->f_ffree = 0;
1104         buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1105                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
1106         buf->f_bavail =  buf->f_bfree;
1107
1108         yaffs_GrossUnlock(dev);
1109         return 0;
1110 }
1111
1112 static void yaffs_read_inode (struct inode *inode)
1113 {
1114         // NB This is called as a side effect of other functions and
1115         // thus gross locking should always be in place already.
1116
1117         yaffs_Object *obj ;
1118         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1119
1120         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1121
1122         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1123
1124         yaffs_FillInodeFromObject(inode,obj);
1125
1126 }
1127
1128
1129
1130 static yaffs_Device *yaffs_dev;
1131 static yaffs_Device *yaffsram_dev;
1132
1133
1134
1135 static void yaffs_put_super(struct super_block *sb)
1136 {
1137         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1138
1139         yaffs_GrossLock(dev);
1140         if(dev->putSuperFunc)
1141         {
1142                  dev->putSuperFunc(sb);
1143         }
1144         yaffs_Deinitialise(dev);
1145         yaffs_GrossUnlock(dev);
1146
1147         if(dev == yaffs_dev) yaffs_dev = NULL;
1148         if(dev == yaffsram_dev) yaffsram_dev = NULL;
1149
1150         kfree(dev);
1151 }
1152
1153
1154 #ifdef CONFIG_YAFFS_MTD_ENABLED
1155
1156 static void  yaffs_MTDPutSuper(struct super_block *sb)
1157 {
1158
1159         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1160
1161         if(mtd->sync)
1162         {
1163                 mtd->sync(mtd);
1164         }
1165
1166         put_mtd_device(mtd);
1167 }
1168
1169 #endif
1170
1171
1172 static struct super_block *yaffs_internal_read_super(int useRam, struct super_block * sb, void * data, int silent)
1173 {
1174         int nBlocks;
1175         struct inode * inode;
1176         struct dentry * root;
1177         yaffs_Device *dev;
1178
1179         sb->s_magic = YAFFS_MAGIC;
1180         sb->s_op = &yaffs_super_ops;
1181
1182         if(!sb)
1183                 printk(KERN_INFO"yaffs: sb is NULL\n");
1184         else if(!sb->s_dev)
1185                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1186         else if(! kdevname(sb->s_dev))
1187                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1188         else
1189                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1190
1191
1192
1193 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1194         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1195         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1196 #else
1197         sb->s_blocksize = PAGE_CACHE_SIZE;
1198         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1199 #endif
1200         T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1201
1202 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1203         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1204 #endif
1205
1206
1207
1208         if(useRam)
1209         {
1210
1211 #ifdef CONFIG_YAFFS_RAM_ENABLED
1212                 // Set the yaffs_Device up for ram emulation
1213
1214                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1215                 if(!dev)
1216                 {
1217                         // Deep shit could not allocate device structure
1218                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1219                         return NULL;
1220                 }
1221
1222                 memset(dev,0,sizeof(yaffs_Device));
1223                 dev->genericDevice = NULL; // Not used for RAM emulation.
1224
1225                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1226                 dev->startBlock = 1;  // Don't use block 0
1227                 dev->endBlock = nBlocks - 1;
1228                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1229                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1230                 dev->nReservedBlocks = 5;
1231
1232                 dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1233                 dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1234                 dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1235                 dev->initialiseNAND = nandemul_InitialiseNAND;
1236
1237                 yaffsram_dev = dev;
1238
1239 #endif
1240
1241         }
1242         else
1243         {
1244 #ifdef CONFIG_YAFFS_MTD_ENABLED
1245                 struct mtd_info *mtd;
1246
1247                 printk(KERN_DEBUG "yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1248                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev));
1249
1250                 // Check it's an mtd device.....
1251                 if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1252                 {
1253                         return NULL; // This isn't an mtd device
1254                 }
1255
1256                 // Get the device
1257                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1258                 if (!mtd)
1259                 {
1260                         printk(KERN_DEBUG "yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev));
1261                         return NULL;
1262                 }
1263
1264                 // Check it's NAND
1265                 if(mtd->type != MTD_NANDFLASH)
1266                 {
1267                         printk(KERN_DEBUG "yaffs: MTD device is not NAND it's type %d\n", mtd->type);
1268                         return NULL;
1269                 }
1270
1271                 //printk(KERN_DEBUG" erase %x\n",mtd->erase);
1272                 //printk(KERN_DEBUG" read %x\n",mtd->read);
1273                 //printk(KERN_DEBUG" write %x\n",mtd->write);
1274                 //printk(KERN_DEBUG" readoob %x\n",mtd->read_oob);
1275                 //printk(KERN_DEBUG" writeoob %x\n",mtd->write_oob);
1276                 //printk(KERN_DEBUG" oobblock %x\n",mtd->oobblock);
1277                 //printk(KERN_DEBUG" oobsize %x\n",mtd->oobsize);
1278
1279
1280                 if(!mtd->erase ||
1281                    !mtd->read  ||
1282                    !mtd->write ||
1283 #ifndef CONFIG_YAFFS_USE_OLD_MTD
1284                    !mtd->write_ecc ||
1285                    !mtd->read_ecc ||
1286 #endif
1287                    !mtd->read_oob ||
1288                    !mtd->write_oob )
1289                 {
1290                         printk(KERN_DEBUG "yaffs: MTD device does not support required functions\n");
1291                         return NULL;
1292                 }
1293
1294                 if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1295                    mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1296                 {
1297                         printk(KERN_DEBUG "yaffs: MTD device does not support have the right page sizes\n");
1298                         return NULL;
1299                 }
1300
1301
1302                 // OK, so if we got here, we have an MTD that's NAND and looks
1303                 // like it has the right capabilities
1304                 // Set the yaffs_Device up for ram emulation
1305
1306 #if defined(CONFIG_KERNEL_2_5)
1307                 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1308 #else
1309                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1310 #endif
1311                 if(!dev)
1312                 {
1313                         // Deep shit could not allocate device structure
1314                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1315                         return NULL;
1316                 }
1317
1318                 memset(dev,0,sizeof(yaffs_Device));
1319                 dev->genericDevice = mtd;
1320
1321                 // Set up the memory size parameters....
1322
1323                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1324                 dev->startBlock = 1;  // Don't use block 0
1325                 dev->endBlock = nBlocks - 1;
1326                 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1327                 dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1328                 dev->nReservedBlocks = 5;
1329                 dev->nShortOpCaches = 10; // Enable short op caching
1330
1331
1332                 // ... and the functions.
1333                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1334                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1335                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1336                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1337
1338                 dev->putSuperFunc = yaffs_MTDPutSuper;
1339
1340 #ifdef CONFIG_YAFFS_USE_NANDECC
1341                 dev->useNANDECC = 1;
1342 #endif
1343
1344                 yaffs_dev = dev;
1345
1346 #endif
1347         }
1348
1349         init_MUTEX(&dev->grossLock);
1350
1351
1352         yaffs_GrossLock(dev);
1353         yaffs_GutsInitialise(yaffs_SuperToDevice(sb));
1354
1355         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised\n"));
1356
1357         // Create root inode
1358         inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(yaffs_SuperToDevice(sb)));
1359
1360         yaffs_GrossUnlock(dev);
1361
1362         if (!inode)
1363                 return NULL;
1364
1365 // added NCB
1366         inode->i_op = & yaffs_dir_inode_operations;
1367         inode->i_fop = & yaffs_dir_operations;
1368
1369         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1370
1371
1372         root = d_alloc_root(inode);
1373
1374         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1375
1376         if (!root) {
1377                 iput(inode);
1378                 return NULL;
1379         }
1380         sb->s_root = root;
1381
1382         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1383         return sb;
1384 }
1385
1386 static int yaffs_internal_read_super_ram(struct super_block * sb, void * data, int silent)
1387 {
1388          return yaffs_internal_read_super(1,sb,data,silent) ? 0 : -1;
1389 }
1390 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1391 {
1392          return yaffs_internal_read_super(0,sb,data,silent) ? 0 : -1;
1393 }
1394
1395
1396 #ifdef CONFIG_YAFFS_MTD_ENABLED
1397 #if defined(CONFIG_KERNEL_2_5)
1398 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1399 {
1400
1401     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1402 }
1403
1404 /* changes NCB 2.5.70 */
1405 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1406 static struct file_system_type yaffs_fs_type = {
1407         .owner          = THIS_MODULE,
1408         .name           = "yaffs",
1409         .get_sb         = yaffs_read_super,
1410 //      .kill_sb        = kill_block_super,
1411         .kill_sb        = kill_litter_super,
1412         .fs_flags       = FS_REQUIRES_DEV,
1413 };
1414 #else
1415 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1416 {
1417         return yaffs_internal_read_super(0,sb,data,silent);
1418 }
1419
1420 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1421 #endif
1422 #endif
1423
1424 #ifdef CONFIG_YAFFS_RAM_ENABLED
1425
1426 #if defined(CONFIG_KERNEL_2_5)
1427 static struct super_block *yaffs_ram_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1428 {
1429
1430     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_ram);
1431 }
1432
1433 /* changes NCB 2.5.70 */
1434 //static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1435 static struct file_system_type yaffs_fs_type = {
1436         .owner          = THIS_MODULE,
1437         .name           = "yaffsram",
1438         .get_sb         = yaffs_ram_read_super,
1439 //      .kill_sb        = kill_block_super,
1440         .kill_sb        = kill_litter_super,
1441         .fs_flags       = FS_SINGLE,
1442 };
1443 #else
1444 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1445 {
1446         return yaffs_internal_read_super(1,sb,data,silent);
1447 }
1448
1449 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1450 #endif
1451 #endif // CONFIG_YAFFS_RAM_ENABLED
1452
1453
1454 static struct proc_dir_entry *my_proc_entry;
1455 static struct proc_dir_entry *my_proc_ram_write_entry;
1456
1457 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
1458 {
1459         buf +=sprintf(buf,"\nDevice %s\n",name);
1460         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1461         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1462         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1463         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1464         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1465         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1466         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1467         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1468         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1469         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1470         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1471         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1472         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1473         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1474         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1475         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1476         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1477         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1478         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1479         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1480         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1481         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1482         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1483         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1484         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1485         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1486         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1487
1488
1489         return buf;
1490 }
1491
1492 static int  yaffs_proc_read(
1493         char *page,
1494         char **start,
1495         off_t offset,
1496         int count,
1497         int *eof,
1498         void *data
1499         )
1500 {
1501
1502         char my_buffer[3000];
1503         char *buf;
1504         buf = my_buffer;
1505
1506         if (offset > 0) return 0;
1507
1508         /* Fill the buffer and get its length */
1509         buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
1510
1511         if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
1512         if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
1513
1514
1515         strcpy(page,my_buffer);
1516         return strlen(my_buffer);
1517 }
1518
1519
1520 static int  yaffs_proc_ram_write(
1521         char *page,
1522         char **start,
1523         off_t offset,
1524         int count,
1525         int *eof,
1526         void *data
1527         )
1528 {
1529
1530         printk(KERN_DEBUG "yaffs write size %d\n",count);
1531         return count;
1532 }
1533
1534 static int __init init_yaffs_fs(void)
1535 {
1536         int error = 0;
1537
1538         yaffs_dev = yaffsram_dev = NULL;
1539
1540         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Initialisation\n");
1541 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
1542         printk(KERN_DEBUG "yaffs is using generic read/write (caching)\n");
1543 #else
1544         printk(KERN_DEBUG "yaffs is using direct read/write (uncached)\n");
1545 #endif
1546
1547
1548     /* Install the proc_fs entry */
1549     my_proc_entry = create_proc_read_entry("yaffs",
1550                                            S_IRUGO | S_IFREG,
1551                                            &proc_root,
1552                                            yaffs_proc_read,
1553                                            NULL);
1554     if(!my_proc_entry)
1555     {
1556        return -ENOMEM;
1557     }
1558
1559 #ifdef CONFIG_YAFFS_RAM_ENABLED
1560 #if 0
1561     my_proc_ram_write_entry = create_proc_entry("yaffs_ram",
1562                                            S_IRUGO | S_IFREG,
1563                                            &proc_root);
1564
1565     if(!my_proc_ram_write_entry)
1566     {
1567        return -ENOMEM;
1568     }
1569     else
1570     {
1571         my_proc_ram_write_entry->write_proc = yaffs_proc_ram_write;
1572     }
1573 #endif
1574
1575     error = register_filesystem(&yaffs_ram_fs_type);
1576     if(error)
1577     {
1578         return error;
1579     }
1580 #endif //CONFIG_YAFFS_RAM_ENABLED
1581
1582 #ifdef CONFIG_YAFFS_MTD_ENABLED
1583         error = register_filesystem(&yaffs_fs_type);
1584         if(error)
1585         {
1586 #ifdef CONFIG_YAFFS_RAM_ENABLED
1587                 unregister_filesystem(&yaffs_ram_fs_type);
1588 #endif //CONFIG_YAFFS_RAM_ENABLED
1589         }
1590 #endif // CONFIG_YAFFS_MTD_ENABLED
1591
1592         return error;
1593 }
1594
1595 static void __exit exit_yaffs_fs(void)
1596 {
1597         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Clean up\n");
1598
1599     remove_proc_entry("yaffs",&proc_root);
1600
1601 #ifdef CONFIG_YAFFS_RAM_ENABLED
1602         unregister_filesystem(&yaffs_ram_fs_type);
1603 #endif
1604 #ifdef CONFIG_YAFFS_MTD_ENABLED
1605         unregister_filesystem(&yaffs_fs_type);
1606 #endif
1607
1608 }
1609
1610 module_init(init_yaffs_fs)
1611 module_exit(exit_yaffs_fs)
1612
1613 MODULE_DESCRIPTION("YAFFS - a NAND specific flash file system");
1614 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002");
1615 MODULE_LICENSE("GPL");
1616