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  * * Andras Toth for mknod rdev issue.
  26  * * Some code bodily lifted from JFFS2.
  27  */
  28
  29
  30 const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.17 2002-10-02 02:11:25 charles Exp $";
  31 extern const char *yaffs_guts_c_version;
  32
  33 #include <linux/config.h>
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/version.h>
  37 #include <linux/slab.h>
  38 #include <linux/init.h>
  39 #include <linux/list.h>
  40 #include <linux/fs.h>
  41 #include <linux/proc_fs.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/mtd/mtd.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/string.h>
  46 #include <linux/locks.h>
  47
  48 #include <asm/uaccess.h>
  49
  50 #include "yaffs_guts.h"
  51
  52 #ifdef CONFIG_YAFFS_RAM_ENABLED
  53 #include "yaffs_nandemul.h"
  54 // 2 MB of RAM for emulation
  55 #define YAFFS_RAM_EMULATION_SIZE  0x200000
  56 #endif //CONFIG_YAFFS_RAM_ENABLED
  57
  58 #ifdef CONFIG_YAFFS_MTD_ENABLED
  59 #include <linux/mtd/mtd.h>
  60 #include "yaffs_mtdif.h"
  61 #endif //CONFIG_YAFFS_MTD_ENABLED
  62
  63 #define T(x) printk x
  64
  65
  66
  67 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
  68 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
  69 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
  70
  71
  72
  73 static void yaffs_put_super(struct super_block *sb);
  74
  75 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos);
  76 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
  77 static int yaffs_file_flush(struct file* file);
  78
  79 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
  80
  81 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
  82
  83 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
  84 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
  85 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
  86 static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
  87 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
  88 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
  89 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
  90 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
  91 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
  92
  93 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
  94 static void yaffs_read_inode (struct inode *inode);
  95 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent);
  96 static void yaffs_put_inode (struct inode *inode);
  97 static void yaffs_delete_inode(struct inode *);
  98 static void yaffs_clear_inode(struct inode *);
  99
 100 static int yaffs_readpage(struct file *file, struct page * page);
 101
 102 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 103 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 104
 105 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen);
 106 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 107
 108
 109
 110
 111 static struct address_space_operations yaffs_file_address_operations = {
 112         readpage:               yaffs_readpage,
 113         prepare_write:  yaffs_prepare_write,
 114         commit_write:   yaffs_commit_write
 115 };
 116
 117
 118 static struct file_operations yaffs_file_operations = {
 119 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
 120         read:           generic_file_read,
 121         write:          generic_file_write,
 122 #else
 123         read:           yaffs_file_read,
 124         write:          yaffs_file_write,
 125 #endif
 126         mmap:           generic_file_mmap,
 127         flush:          yaffs_file_flush,
 128         fsync:          yaffs_sync_object,
 129 };
 130
 131
 132 static struct inode_operations yaffs_file_inode_operations = {
 133         setattr:        yaffs_setattr,
 134 };
 135
 136
 137 struct inode_operations yaffs_symlink_inode_operations =
 138 {
 139         readlink:       yaffs_readlink,
 140         follow_link:    yaffs_follow_link,
 141         setattr:        yaffs_setattr
 142 };
 143
 144 static struct inode_operations yaffs_dir_inode_operations = {
 145         create:         yaffs_create,
 146         lookup:         yaffs_lookup,
 147         link:           yaffs_link,
 148         unlink:         yaffs_unlink,
 149         symlink:        yaffs_symlink,
 150         mkdir:          yaffs_mkdir,
 151         rmdir:          yaffs_unlink,
 152         mknod:          yaffs_mknod,
 153         rename:         yaffs_rename,
 154         setattr:        yaffs_setattr,
 155 };
 156
 157 static struct file_operations yaffs_dir_operations = {
 158         read:           generic_read_dir,
 159         readdir:        yaffs_readdir,
 160         fsync:          yaffs_sync_object,
 161 };
 162
 163
 164 static struct super_operations yaffs_super_ops = {
 165         statfs:                 yaffs_statfs,
 166         read_inode:             yaffs_read_inode,
 167         put_inode:              yaffs_put_inode,
 168         put_super:              yaffs_put_super,
 169 //      remount_fs:
 170         delete_inode:           yaffs_delete_inode,
 171         clear_inode:            yaffs_clear_inode,
 172 };
 173
 174
 175
 176 static void yaffs_GrossLock(yaffs_Device *dev)
 177 {
 178         T((KERN_DEBUG"yaffs locking\n"));
 179
 180         down(&dev->grossLock);
 181 }
 182
 183 static void yaffs_GrossUnlock(yaffs_Device *dev)
 184 {
 185         T((KERN_DEBUG"yaffs unlocking\n"));
 186         up(&dev->grossLock);
 187
 188 }
 189
 190 static int yaffs_readlink(struct dentry *dentry, char *buffer, int buflen)
 191 {
 192         unsigned char *alias;
 193         int ret;
 194
 195         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 196
 197
 198         yaffs_GrossLock(dev);
 199
 200         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 201
 202         yaffs_GrossUnlock(dev);
 203
 204         if(!alias)
 205                 return -ENOMEM;
 206
 207         ret = vfs_readlink(dentry, buffer, buflen, alias);
 208         kfree(alias);
 209         return ret;
 210 }
 211
 212 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 213 {
 214         unsigned char *alias;
 215         int ret;
 216         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 217
 218
 219         yaffs_GrossLock(dev);
 220
 221         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 222
 223         yaffs_GrossUnlock(dev);
 224
 225         if(!alias)
 226                 return -ENOMEM;
 227
 228         ret = vfs_follow_link(nd,alias);
 229         kfree(alias);
 230         return ret;
 231 }
 232
 233
 234 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 235
 236 /*
 237  * Lookup is used to find objects in the fs
 238  */
 239 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 240 {
 241         yaffs_Object *obj;
 242         struct inode *inode;
 243
 244         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 245
 246
 247         yaffs_GrossLock(dev);
 248
 249
 250         T((KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 251
 252         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 253
 254         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 255
 256
 257
 258         if(obj)
 259         {
 260                 T((KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 261
 262                 inode = yaffs_get_inode(dir->i_sb, obj->st_mode,0,obj);
 263
 264                 if(inode)
 265                 {
 266                         T((KERN_DEBUG"yaffs_loookup dentry \n"));
 267                         //dget(dentry); // try to solve directory bug
 268                         d_add(dentry,inode);
 269
 270                         yaffs_GrossUnlock(dev);
 271
 272                         // return dentry;
 273                         return NULL;
 274                 }
 275
 276         }
 277         else
 278         {
 279                 T((KERN_DEBUG"yaffs_lookup not found\n"));
 280
 281         }
 282         yaffs_GrossUnlock(dev);
 283
 284         return NULL;
 285         //      return (ERR_PTR(-EIO));
 286
 287 }
 288
 289 // For now put inode is just for debugging
 290 // Put inode is called when the inode **structure** is put.
 291 static void yaffs_put_inode(struct inode *inode)
 292 {
 293         T(("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 294
 295 }
 296
 297 // clear is called to tell the fs to release any per-inode data it holds
 298 static void yaffs_clear_inode(struct inode *inode)
 299 {
 300         yaffs_Object *obj = yaffs_InodeToObject(inode);
 301
 302         T(("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 303                 obj ? "object exists" : "null object"));
 304
 305         if(obj)
 306         {
 307                 obj->myInode = NULL;
 308                 inode->u.generic_ip = NULL;
 309         }
 310
 311
 312 }
 313
 314 // delete is called when the link count is zero and the inode
 315 // is put (ie. nobody wants to know about it anymore, time to
 316 // delete the file).
 317 // NB Must call clear_inode()
 318 static void yaffs_delete_inode(struct inode *inode)
 319 {
 320         yaffs_Object *obj = yaffs_InodeToObject(inode);
 321         yaffs_Device *dev;
 322
 323         T(("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 324                 obj ? "object exists" : "null object"));
 325
 326         if(obj)
 327         {
 328                 dev = obj->myDev;
 329                 yaffs_GrossLock(dev);
 330                 yaffs_DeleteFile(obj);
 331                 yaffs_GrossUnlock(dev);
 332         }
 333         clear_inode(inode);
 334 }
 335
 336
 337 static int yaffs_file_flush(struct file* file)
 338 {
 339         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 340
 341         yaffs_Device *dev = obj->myDev;
 342
 343         T((KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 344                                 obj->dirty ? "dirty" : "clean"));
 345
 346         yaffs_GrossLock(dev);
 347
 348     yaffs_FlushFile(obj);
 349
 350         yaffs_GrossUnlock(dev);
 351
 352     return 0;
 353 }
 354
 355
 356
 357 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 358 {
 359         // Lifted from jffs2
 360
 361         yaffs_Object *obj;
 362         unsigned char *pg_buf;
 363         int ret;
 364
 365         yaffs_Device *dev;
 366
 367         T((KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 368                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 369
 370         obj  = yaffs_DentryToObject(f->f_dentry);
 371
 372         dev = obj->myDev;
 373
 374
 375         if (!PageLocked(pg))
 376                 PAGE_BUG(pg);
 377
 378         pg_buf = kmap(pg);
 379         /* FIXME: Can kmap fail? */
 380
 381         yaffs_GrossLock(dev);
 382
 383         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 384
 385         yaffs_GrossUnlock(dev);
 386
 387         if(ret >= 0) ret = 0;
 388
 389         if (ret) {
 390                 ClearPageUptodate(pg);
 391                 SetPageError(pg);
 392         } else {
 393                 SetPageUptodate(pg);
 394                 ClearPageError(pg);
 395         }
 396
 397         flush_dcache_page(pg);
 398         kunmap(pg);
 399
 400
 401         T((KERN_DEBUG"yaffs_readpage done\n"));
 402         return ret;
 403 }
 404
 405 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 406 {
 407         int ret = yaffs_readpage_nolock(f,pg);
 408         UnlockPage(pg);
 409         return ret;
 410 }
 411
 412 static int yaffs_readpage(struct file *f, struct page * pg)
 413 {
 414         return yaffs_readpage_unlock(f,pg);
 415 }
 416
 417
 418 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 419 {
 420
 421         T((KERN_DEBUG"yaffs_prepair_write\n"));
 422         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 423                 return  yaffs_readpage_nolock(f,pg);
 424
 425         return 0;
 426
 427 }
 428
 429 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 430 {
 431
 432         void *addr = page_address(pg) + offset;
 433         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 434         int nBytes = to - offset;
 435         int nWritten;
 436
 437         unsigned spos = pos;
 438         unsigned saddr = (unsigned)addr;
 439
 440         T((KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 441
 442         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 443
 444         if(nWritten != nBytes)
 445         {
 446                 T((KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 447                 SetPageError(pg);
 448                 ClearPageUptodate(pg);
 449         }
 450         else
 451         {
 452                 SetPageUptodate(pg);
 453         }
 454
 455         T((KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 456
 457         return nWritten;
 458
 459 }
 460
 461
 462
 463 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 464 {
 465         if (inode && obj)
 466         {
 467                 inode->i_ino = obj->objectId;
 468                 inode->i_mode = obj->st_mode;
 469                 inode->i_uid = obj->st_uid;
 470                 inode->i_gid = obj->st_gid;
 471                 inode->i_blksize = inode->i_sb->s_blocksize;
 472                 inode->i_blocks = 0;
 473                 inode->i_rdev = obj->st_rdev;;
 474                 inode->i_atime = obj->st_atime;
 475                 inode->i_mtime = obj->st_mtime;
 476                 inode->i_ctime = obj->st_ctime;
 477                 inode->i_size = yaffs_GetObjectFileLength(obj);
 478                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 479
 480                 T((KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 481                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 482
 483                 switch (obj->st_mode & S_IFMT)
 484                 {
 485                         default: // fifo, device or socket
 486                                 init_special_inode(inode, obj->st_mode, obj->st_rdev);
 487                                 break;
 488                         case S_IFREG:   // file
 489                                 inode->i_op = &yaffs_file_inode_operations;
 490                                 inode->i_fop = &yaffs_file_operations;
 491                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 492                                 break;
 493                         case S_IFDIR:   // directory
 494                                 inode->i_op = &yaffs_dir_inode_operations;
 495                                 inode->i_fop = &yaffs_dir_operations;
 496                                 break;
 497                         case S_IFLNK:   // symlink
 498                                 inode->i_op = &yaffs_symlink_inode_operations;
 499                                 break;
 500                 }
 501
 502
 503                 inode->u.generic_ip = obj;
 504                 obj->myInode = inode;
 505
 506         }
 507         else
 508         {
 509                 T((KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 510         }
 511
 512 }
 513
 514 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 515 {
 516         struct inode * inode;
 517
 518         T((KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 519
 520         inode = iget(sb,obj->objectId);
 521
 522         // NB Side effect: iget calls back to yaffs_read_inode().
 523         // iget also increments the inode's i_count
 524
 525         return inode;
 526 }
 527
 528 static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos)
 529 {
 530         yaffs_Object *obj;
 531         int nRead,ipos;
 532         struct inode *inode;
 533         yaffs_Device *dev;
 534
 535         T((KERN_DEBUG"yaffs_file_read\n"));
 536
 537         obj  = yaffs_DentryToObject(f->f_dentry);
 538
 539         dev = obj->myDev;
 540
 541         yaffs_GrossLock(dev);
 542
 543         inode = f->f_dentry->d_inode;
 544
 545         if (*pos < inode->i_size)
 546         {
 547                         if (*pos + n > inode->i_size)
 548                         {
 549                                 n = inode->i_size - *pos;
 550                         }
 551         }
 552         else
 553         {
 554                 n = 0;
 555         }
 556
 557         nRead = yaffs_ReadDataFromFile(obj,buf,*pos,n);
 558         if(nRead > 0)
 559         {
 560                 f->f_pos += nRead;
 561         }
 562
 563         yaffs_GrossUnlock(dev);
 564
 565         ipos = *pos;
 566
 567         T((KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos));
 568         return nRead;
 569
 570 }
 571
 572
 573 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 574 {
 575         yaffs_Object *obj;
 576         int nWritten,ipos;
 577         struct inode *inode;
 578         yaffs_Device *dev;
 579
 580
 581         obj  = yaffs_DentryToObject(f->f_dentry);
 582
 583         dev = obj->myDev;
 584
 585         yaffs_GrossLock(dev);
 586
 587         inode = f->f_dentry->d_inode;
 588
 589         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 590         {
 591                 ipos = inode->i_size;
 592         }
 593         else
 594         {
 595                 ipos = *pos;
 596         }
 597
 598
 599         if(!obj)
 600         {
 601                 T((KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 602         }
 603         else
 604         {
 605                 T((KERN_DEBUG"yaffs_file_write about to write writing %d bytes to object %d at %d\n",n,obj->objectId,ipos));
 606         }
 607
 608         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n);
 609
 610         T((KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 611         if(nWritten > 0)
 612         {
 613                 ipos += nWritten;
 614                 *pos = ipos;
 615                 if(ipos > inode->i_size)
 616                 {
 617                         inode->i_size = ipos;
 618                         inode->i_blocks = (ipos + inode->i_blksize - 1)/ inode->i_blksize;
 619
 620                         T((KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 621                 }
 622
 623         }
 624         yaffs_GrossUnlock(dev);
 625
 626         return nWritten != n ? -ENOSPC : nWritten;
 627 }
 628
 629
 630 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 631 {
 632         yaffs_Object *obj;
 633         yaffs_Device *dev;
 634         struct inode *inode = f->f_dentry->d_inode;
 635         unsigned long offset, curoffs;
 636         struct list_head *i;
 637         yaffs_Object *l;
 638
 639         char name[YAFFS_MAX_NAME_LENGTH +1];
 640
 641         obj =  yaffs_DentryToObject(f->f_dentry);
 642         dev = obj->myDev;
 643
 644         yaffs_GrossLock(dev);
 645
 646         offset = f->f_pos;
 647
 648         T(("yaffs_readdir: starting at %d\n",(int)offset));
 649
 650         if(offset == 0)
 651         {
 652         T((KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 653                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 654                 {
 655                         goto out;
 656                 }
 657                 offset++;
 658                 f->f_pos++;
 659         }
 660         if(offset == 1)
 661         {
 662                 T((KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 663                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 664                 {
 665                         goto out;
 666                 }
 667                 offset++;
 668                 f->f_pos++;
 669         }
 670
 671         curoffs = 1;
 672
 673         list_for_each(i,&obj->variant.directoryVariant.children)
 674         {
 675                 curoffs++;
 676                 if(curoffs >= offset)
 677                 {
 678                         l = list_entry(i, yaffs_Object,siblings);
 679
 680                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 681                         T((KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 682
 683                         if(filldir(dirent,
 684                                            name,
 685                                            strlen(name),
 686                                            offset,
 687                                            yaffs_GetObjectInode(l),
 688                                            yaffs_GetObjectType(l))
 689                                            < 0)
 690                         {
 691                                 goto up_and_out;
 692                         }
 693
 694                         offset++;
 695                         f->f_pos++;
 696                 }
 697         }
 698
 699   up_and_out:
 700   out:
 701
 702     yaffs_GrossUnlock(dev);
 703
 704         return 0;
 705 }
 706
 707
 708 /*
 709  * File creation. Allocate an inode, and we're done..
 710  */
 711 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 712 {
 713         struct inode *inode;
 714
 715         yaffs_Object *obj = NULL;
 716         yaffs_Device *dev;
 717
 718         yaffs_Object *parent = yaffs_InodeToObject(dir);
 719
 720         int error = -ENOSPC;
 721
 722         if(parent)
 723         {
 724                 T((KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 725                                          parent->objectId,parent->variantType));
 726         }
 727         else
 728         {
 729                 T((KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 730                 return -EPERM;
 731         }
 732
 733         T(("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 734                                         dentry->d_name.name, mode,rdev));
 735
 736         dev = parent->myDev;
 737
 738         yaffs_GrossLock(dev);
 739
 740         switch (mode & S_IFMT)
 741         {
 742                 default:
 743                         // Special (socket, fifo, device...)
 744                         T((KERN_DEBUG"yaffs_mknod: making special\n"));
 745                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev);
 746                         break;
 747                 case S_IFREG:   // file
 748                         T((KERN_DEBUG"yaffs_mknod: making file\n"));
 749                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid);
 750                         break;
 751                 case S_IFDIR:   // directory
 752                         T((KERN_DEBUG"yaffs_mknod: making directory\n"));
 753                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid);
 754                         break;
 755                 case S_IFLNK:   // symlink
 756                         T((KERN_DEBUG"yaffs_mknod: making file\n"));
 757                         obj = NULL; // Do we ever get here?
 758                         break;
 759         }
 760
 761         if(obj)
 762         {
 763                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 764                 d_instantiate(dentry, inode);
 765                 T((KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 766                 error = 0;
 767         }
 768         else
 769         {
 770                 T((KERN_DEBUG"yaffs_mknod failed making object\n"));
 771                 error = -ENOMEM;
 772         }
 773
 774         yaffs_GrossUnlock(dev);
 775
 776         return error;
 777 }
 778
 779 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 780 {
 781         int retVal;
 782         T((KERN_DEBUG"yaffs_mkdir\n"));
 783         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 784 #if 0
 785  // attempt to fix dir bug - didn't work
 786         if(!retVal)
 787         {
 788                 dget(dentry);
 789         }
 790 #endif
 791         return retVal;
 792 }
 793
 794 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 795 {
 796         T((KERN_DEBUG"yaffs_create\n"));
 797         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 798 }
 799
 800
 801 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 802 {
 803         int retVal;
 804         int nlinks;
 805
 806         yaffs_Device *dev;
 807
 808
 809         T((KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
 810
 811         dev = yaffs_InodeToObject(dir)->myDev;
 812
 813         yaffs_GrossLock(dev);
 814
 815
 816         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
 817
 818
 819         yaffs_GrossUnlock(dev);
 820
 821         if( retVal == YAFFS_OK)
 822         {
 823                 dentry->d_inode->i_nlink--;
 824                 return 0;
 825         }
 826         else
 827         {
 828                 return -ENOTEMPTY;
 829         }
 830 }
 831
 832
 833 /*
 834  * Create a link...
 835  */
 836 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
 837 {
 838         struct inode *inode = old_dentry->d_inode;
 839         yaffs_Object *obj = NULL;
 840         yaffs_Object *link=NULL;
 841         yaffs_Device *dev;
 842
 843         T((KERN_DEBUG"yaffs_link\n"));
 844
 845         obj = yaffs_InodeToObject(inode);
 846         dev = obj->myDev;
 847
 848         yaffs_GrossLock(dev);
 849
 850         link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
 851
 852
 853         if(link)
 854         {
 855                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
 856                 d_instantiate(dentry, old_dentry->d_inode);
 857                 atomic_inc(&old_dentry->d_inode->i_count);
 858                 T((KERN_DEBUG"yaffs_link link count %d i_count %d\n",
 859                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
 860
 861         }
 862
 863         yaffs_GrossUnlock(dev);
 864
 865
 866         if(link)
 867         {
 868
 869                 return 0;
 870         }
 871
 872
 873         return -EPERM;
 874 }
 875
 876
 877 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
 878 {
 879         yaffs_Object *obj;
 880         yaffs_Device *dev;
 881
 882         T((KERN_DEBUG"yaffs_symlink\n"));
 883
 884         dev = yaffs_InodeToObject(dir)->myDev;
 885         yaffs_GrossLock(dev);
 886         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
 887                                                          S_IFLNK | S_IRWXUGO, current->uid, current->gid,
 888                                                          symname);
 889         yaffs_GrossUnlock(dev);
 890
 891         if(obj)
 892         {
 893                 T((KERN_DEBUG"symlink created OK\n"));
 894                 return 0;
 895         }
 896         else
 897         {
 898                 T((KERN_DEBUG"symlink not created\n"));
 899
 900         }
 901
 902         return -ENOMEM;
 903 }
 904
 905 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
 906 {
 907
 908         yaffs_Object *obj;
 909         yaffs_Device *dev;
 910
 911         obj = yaffs_DentryToObject(dentry);
 912
 913         dev = obj->myDev;
 914
 915         T((KERN_DEBUG"yaffs_sync_object\n"));
 916         yaffs_GrossLock(dev);
 917         yaffs_FlushFile(obj);
 918         yaffs_GrossUnlock(dev);
 919         return 0;
 920 }
 921
 922 /*
 923  * The VFS layer already does all the dentry stuff for rename.
 924  *
 925  * NB: POSIX says you can rename an object over an old object of the same name
 926  */
 927 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
 928 {
 929         yaffs_Device *dev;
 930         int retVal;
 931
 932         dev = yaffs_InodeToObject(old_dir)->myDev;
 933
 934         yaffs_GrossLock(dev);
 935
 936         // Unlink the target if it exists
 937         yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
 938
 939
 940         retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
 941                                          yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
 942         yaffs_GrossUnlock(dev);
 943
 944         if(retVal == YAFFS_OK)
 945         {
 946                 return 0;
 947         }
 948         else
 949         {
 950                 return -ENOTEMPTY;
 951         }
 952
 953
 954 }
 955
 956 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
 957 {
 958         struct inode *inode = dentry->d_inode;
 959         int error;
 960         yaffs_Device *dev;
 961
 962         T((KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
 963
 964         if((error = inode_change_ok(inode,attr)) == 0)
 965         {
 966
 967                 dev = yaffs_InodeToObject(inode)->myDev;
 968                 yaffs_GrossLock(dev);
 969                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
 970                 {
 971                         error = 0;
 972                 }
 973                 else
 974                 {
 975                         error = -EPERM;
 976                 }
 977                 yaffs_GrossUnlock(dev);
 978                 inode_setattr(inode,attr);
 979         }
 980         return error;
 981 }
 982
 983 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
 984 {
 985         yaffs_Device *dev = yaffs_SuperToDevice(sb);
 986         T((KERN_DEBUG"yaffs_statfs\n"));
 987
 988         yaffs_GrossLock(dev);
 989
 990         buf->f_type = YAFFS_MAGIC;
 991         buf->f_bsize = sb->s_blocksize;
 992         buf->f_namelen = 255;
 993         buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * YAFFS_CHUNKS_PER_BLOCK/
 994                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
 995         buf->f_files = 0;
 996         buf->f_ffree = 0;
 997         buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
 998                                                 (sb->s_blocksize/YAFFS_BYTES_PER_CHUNK);
 999         buf->f_bavail =  buf->f_bfree;
1000
1001         yaffs_GrossUnlock(dev);
1002         return 0;
1003 }
1004
1005 static void yaffs_read_inode (struct inode *inode)
1006 {
1007         // NB This is called as a side effect of other functions and
1008         // thus gross locking should always be in place already.
1009
1010         yaffs_Object *obj ;
1011         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1012
1013         T((KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1014
1015         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1016
1017         yaffs_FillInodeFromObject(inode,obj);
1018
1019 }
1020
1021
1022
1023 static yaffs_Device *yaffs_dev;
1024 static yaffs_Device *yaffsram_dev;
1025
1026
1027
1028 static void yaffs_put_super(struct super_block *sb)
1029 {
1030         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1031
1032         yaffs_GrossLock(dev);
1033         if(dev->putSuperFunc)
1034         {
1035                  dev->putSuperFunc(sb);
1036         }
1037         yaffs_Deinitialise(dev);
1038         yaffs_GrossUnlock(dev);
1039
1040         if(dev == yaffs_dev) yaffs_dev = NULL;
1041         if(dev == yaffsram_dev) yaffsram_dev = NULL;
1042
1043         kfree(dev);
1044 }
1045
1046
1047 #ifdef CONFIG_YAFFS_MTD_ENABLED
1048
1049 static void  yaffs_MTDPutSuper(struct super_block *sb)
1050 {
1051
1052         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1053
1054         if(mtd->sync)
1055         {
1056                 mtd->sync(mtd);
1057         }
1058
1059         put_mtd_device(mtd);
1060 }
1061
1062 #endif
1063
1064
1065 static struct super_block *yaffs_internal_read_super(int useRam, struct super_block * sb, void * data, int silent)
1066 {
1067         int nBlocks;
1068         struct inode * inode;
1069         struct dentry * root;
1070         yaffs_Device *dev;
1071
1072         sb->s_magic = YAFFS_MAGIC;
1073         sb->s_op = &yaffs_super_ops;
1074
1075         if(!sb)
1076                 printk(KERN_INFO"yaffs: sb is NULL\n");
1077         else if(!sb->s_dev)
1078                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1079         else if(! kdevname(sb->s_dev))
1080                 printk(KERN_INFO"yaffs: kdevname is NULL\n");
1081         else
1082                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, kdevname(sb->s_dev));
1083
1084
1085
1086 #ifdef CONFIG_YAFFS_USE_CHUNK_SIZE
1087         sb->s_blocksize = YAFFS_BYTES_PER_CHUNK;
1088         sb->s_blocksize_bits = YAFFS_CHUNK_SIZE_SHIFT;
1089 #else
1090         sb->s_blocksize = PAGE_CACHE_SIZE;
1091         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1092 #endif
1093         T(("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize)));
1094
1095 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1096         T(("yaffs: Write verification disabled. All guarantees null and void\n");
1097 #endif
1098
1099
1100
1101         if(useRam)
1102         {
1103
1104 #ifdef CONFIG_YAFFS_RAM_ENABLED
1105                 // Set the yaffs_Device up for ram emulation
1106
1107                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1108                 if(!dev)
1109                 {
1110                         // Deep shit could not allocate device structure
1111                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1112                         return NULL;
1113                 }
1114
1115                 memset(dev,0,sizeof(yaffs_Device));
1116                 dev->genericDevice = NULL; // Not used for RAM emulation.
1117
1118                 nBlocks = YAFFS_RAM_EMULATION_SIZE / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1119                 dev->startBlock = 1;  // Don't use block 0
1120                 dev->endBlock = nBlocks - 1;
1121
1122                 dev->writeChunkToNAND = nandemul_WriteChunkToNAND;
1123                 dev->readChunkFromNAND = nandemul_ReadChunkFromNAND;
1124                 dev->eraseBlockInNAND = nandemul_EraseBlockInNAND;
1125                 dev->initialiseNAND = nandemul_InitialiseNAND;
1126
1127                 yaffsram_dev = dev;
1128
1129 #endif
1130
1131         }
1132         else
1133         {
1134 #ifdef CONFIG_YAFFS_MTD_ENABLED
1135                 struct mtd_info *mtd;
1136
1137                 printk(KERN_DEBUG "yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1138                  MAJOR(sb->s_dev),MINOR(sb->s_dev),kdevname(sb->s_dev));
1139
1140                 // Hope it's a NAND mtd
1141                 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1142                 if (!mtd)
1143                 {
1144                         printk(KERN_DEBUG "yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev));
1145                         return NULL;
1146                 }
1147
1148                 if(mtd->type != MTD_NANDFLASH)
1149                 {
1150                         printk(KERN_DEBUG "yaffs: MTD device is not NAND it's type %d\n", mtd->type);
1151                         return NULL;
1152                 }
1153
1154                 //printk(KERN_DEBUG" erase %x\n",mtd->erase);
1155                 //printk(KERN_DEBUG" read %x\n",mtd->read);
1156                 //printk(KERN_DEBUG" write %x\n",mtd->write);
1157                 //printk(KERN_DEBUG" readoob %x\n",mtd->read_oob);
1158                 //printk(KERN_DEBUG" writeoob %x\n",mtd->write_oob);
1159                 //printk(KERN_DEBUG" oobblock %x\n",mtd->oobblock);
1160                 //printk(KERN_DEBUG" oobsize %x\n",mtd->oobsize);
1161
1162
1163                 if(!mtd->erase ||
1164                    !mtd->read  ||
1165                    !mtd->write ||
1166                    !mtd->read_oob ||
1167                    !mtd->write_oob)
1168                 {
1169                         printk(KERN_DEBUG "yaffs: MTD device does not support required functions\n");
1170                         return NULL;
1171                 }
1172
1173                 if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1174                    mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1175                 {
1176                         printk(KERN_DEBUG "yaffs: MTD device does not support have the right page sizes\n");
1177                         return NULL;
1178                 }
1179
1180
1181                 // OK, so if we got here, we have an MTD that's NAND and looks
1182                 // like it has the right capabilities
1183                 // Set the yaffs_Device up for ram emulation
1184
1185                 sb->u.generic_sbp =     dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1186                 if(!dev)
1187                 {
1188                         // Deep shit could not allocate device structure
1189                         printk(KERN_DEBUG"yaffs_read_super: Failed trying to allocate yaffs_Device. Terminating debug.\n");
1190                         return NULL;
1191                 }
1192
1193                 memset(dev,0,sizeof(yaffs_Device));
1194                 dev->genericDevice = mtd;
1195
1196                 // Set up the memory size parameters....
1197
1198                 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1199                 dev->startBlock = 1;  // Don't use block 0
1200                 dev->endBlock = nBlocks - 1;
1201
1202                 // ... and the functions.
1203                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1204                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1205                 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1206                 dev->initialiseNAND = nandmtd_InitialiseNAND;
1207
1208                 dev->putSuperFunc = yaffs_MTDPutSuper;
1209
1210                 yaffs_dev = dev;
1211
1212 #endif
1213         }
1214
1215         init_MUTEX(&dev->grossLock);
1216
1217
1218         yaffs_GrossLock(dev);
1219         yaffs_GutsInitialise(yaffs_SuperToDevice(sb));
1220
1221         T(("yaffs_read_super: guts initialised\n"));
1222
1223         // Create root inode
1224         inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(yaffs_SuperToDevice(sb)));
1225
1226         yaffs_GrossUnlock(dev);
1227
1228         if (!inode)
1229                 return NULL;
1230
1231         T(("yaffs_read_super: got root inode\n"));
1232
1233
1234         root = d_alloc_root(inode);
1235
1236         T(("yaffs_read_super: d_alloc_root done\n"));
1237
1238         if (!root) {
1239                 iput(inode);
1240                 return NULL;
1241         }
1242         sb->s_root = root;
1243
1244         T(("yaffs_read_super: done\n"));
1245         return sb;
1246 }
1247
1248 #ifdef CONFIG_YAFFS_MTD_ENABLED
1249 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1250 {
1251         return yaffs_internal_read_super(0,sb,data,silent);
1252 }
1253
1254 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1255 #endif
1256
1257 #ifdef CONFIG_YAFFS_RAM_ENABLED
1258
1259 static struct super_block *yaffs_ram_read_super(struct super_block * sb, void * data, int silent)
1260 {
1261         return yaffs_internal_read_super(1,sb,data,silent);
1262 }
1263
1264 static DECLARE_FSTYPE(yaffs_ram_fs_type, "yaffsram", yaffs_ram_read_super, FS_SINGLE);
1265 #endif // CONFIG_YAFFS_RAM_ENABLED
1266
1267
1268 static struct proc_dir_entry *my_proc_entry;
1269 static struct proc_dir_entry *my_proc_ram_write_entry;
1270
1271 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev,char *name)
1272 {
1273         buf +=sprintf(buf,"\nDevice %s\n",name);
1274         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1275         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1276         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1277         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1278         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1279         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1280         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1281         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1282         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1283         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1284         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1285         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1286         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1287         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1288         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1289         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1290         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1291         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1292         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1293         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1294         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1295         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1296         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1297         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1298         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1299
1300         return buf;
1301 }
1302
1303 static int  yaffs_proc_read(
1304         char *page,
1305         char **start,
1306         off_t offset,
1307         int count,
1308         int *eof,
1309         void *data
1310         )
1311 {
1312
1313         char my_buffer[3000];
1314         char *buf;
1315         buf = my_buffer;
1316
1317         if (offset > 0) return 0;
1318
1319         /* Fill the buffer and get its length */
1320         buf +=sprintf(buf,"YAFFS built:"__DATE__ " "__TIME__"\n%s\n%s\n", yaffs_fs_c_version,yaffs_guts_c_version);
1321
1322         if(yaffs_dev) buf = yaffs_dump_dev(buf,yaffs_dev,"yaffs");
1323         if(yaffsram_dev) buf = yaffs_dump_dev(buf,yaffsram_dev,"yaffsram");
1324
1325
1326         strcpy(page,my_buffer);
1327         return strlen(my_buffer);
1328 }
1329
1330
1331 static int  yaffs_proc_ram_write(
1332         char *page,
1333         char **start,
1334         off_t offset,
1335         int count,
1336         int *eof,
1337         void *data
1338         )
1339 {
1340
1341         printk(KERN_DEBUG "yaffs write size %d\n",count);
1342         return count;
1343 }
1344
1345 static int __init init_yaffs_fs(void)
1346 {
1347         int error = 0;
1348
1349         yaffs_dev = yaffsram_dev = NULL;
1350
1351         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Initialisation\n");
1352 #ifdef CONFIG_YAFFS_USE_GENERIC_RW
1353         printk(KERN_DEBUG "yaffs is using generic read/write (caching)\n");
1354 #else
1355         printk(KERN_DEBUG "yaffs is using direct read/write (uncached)\n");
1356 #endif
1357
1358
1359     /* Install the proc_fs entry */
1360     my_proc_entry = create_proc_read_entry("yaffs",
1361                                            S_IRUGO | S_IFREG,
1362                                            &proc_root,
1363                                            yaffs_proc_read,
1364                                            NULL);
1365     if(!my_proc_entry)
1366     {
1367        return -ENOMEM;
1368     }
1369
1370 #ifdef CONFIG_YAFFS_RAM_ENABLED
1371 #if 0
1372     my_proc_ram_write_entry = create_proc_entry("yaffs_ram",
1373                                            S_IRUGO | S_IFREG,
1374                                            &proc_root);
1375
1376     if(!my_proc_ram_write_entry)
1377     {
1378        return -ENOMEM;
1379     }
1380     else
1381     {
1382         my_proc_ram_write_entry->write_proc = yaffs_proc_ram_write;
1383     }
1384 #endif
1385
1386     error = register_filesystem(&yaffs_ram_fs_type);
1387     if(error)
1388     {
1389         return error;
1390     }
1391 #endif //CONFIG_YAFFS_RAM_ENABLED
1392
1393 #ifdef CONFIG_YAFFS_MTD_ENABLED
1394         error = register_filesystem(&yaffs_fs_type);
1395         if(error)
1396         {
1397 #ifdef CONFIG_YAFFS_RAM_ENABLED
1398                 unregister_filesystem(&yaffs_ram_fs_type);
1399 #endif //CONFIG_YAFFS_RAM_ENABLED
1400         }
1401 #endif // CONFIG_YAFFS_MTD_ENABLED
1402
1403         return error;
1404 }
1405
1406 static void __exit exit_yaffs_fs(void)
1407 {
1408         printk(KERN_DEBUG "yaffs " __DATE__ " " __TIME__ " Clean up\n");
1409
1410     remove_proc_entry("yaffs",&proc_root);
1411
1412 #ifdef CONFIG_YAFFS_RAM_ENABLED
1413         unregister_filesystem(&yaffs_ram_fs_type);
1414 #endif
1415 #ifdef CONFIG_YAFFS_MTD_ENABLED
1416         unregister_filesystem(&yaffs_fs_type);
1417 #endif
1418
1419 }
1420
1421 module_init(init_yaffs_fs)
1422 module_exit(exit_yaffs_fs)
1423
1424 MODULE_DESCRIPTION("YAFFS - a NAND specific flash file system");
1425 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002");
1426 MODULE_LICENSE("GPL");
1427