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  * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with this superblock
  19  * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this superblock
  20  * >> inode->u.generic_ip points to the associated yaffs_Object.
  21  *
  22  *
  23  * Acknowledgements:
  24  * * Luc van OostenRyck for numerous patches.
  25  * * Nick Bane for numerous patches.
  26  * * Nick Bane for 2.5/2.6 integration.
  27  * * Andras Toth for mknod rdev issue.
  28  * * Michael Fischer for finding the problem with inode inconsistency.
  29  * * Some code bodily lifted from JFFS2.
  30  */
  31
  32
  33 const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.27 2005-08-04 22:47:36 luc Exp $";
  34 extern const char *yaffs_guts_c_version;
  35
  36
  37 #include <linux/config.h>
  38 #include <linux/kernel.h>
  39 #include <linux/module.h>
  40 #include <linux/version.h>
  41 #include <linux/slab.h>
  42 #include <linux/init.h>
  43 #include <linux/list.h>
  44 #include <linux/fs.h>
  45 #include <linux/proc_fs.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/mtd/mtd.h>
  49 #include <linux/interrupt.h>
  50 #include <linux/string.h>
  51
  52
  53 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  54
  55 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  56 #include <asm/statfs.h>
  57 #define UnlockPage(p) unlock_page(p)
  58 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  59 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)       // FIXME: use sb->s_id instead ?
  60
  61 #else
  62
  63 #include <linux/locks.h>
  64 #define BDEVNAME_SIZE           0
  65 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
  66
  67 #endif
  68
  69 #include <asm/uaccess.h>
  70
  71 #include "yportenv.h"
  72 #include "yaffs_guts.h"
  73
  74
  75
  76
  77 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS;
  78 //unsigned yaffs_traceMask = 0xFFFFFFFF;
  79
  80
  81 #ifdef CONFIG_YAFFS_YAFFS1
  82 #include <linux/mtd/mtd.h>
  83 #include "yaffs_mtdif.h"
  84 #include "yaffs_mtdif2.h"
  85 #endif //CONFIG_YAFFS_YAFFS1
  86
  87 //#define T(x) printk x
  88
  89
  90
  91 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
  92 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
  93
  94 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  95 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
  96 #else
  97 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
  98 #endif
  99
 100
 101 static void yaffs_put_super(struct super_block *sb);
 102
 103 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos);
 104
 105 static int yaffs_file_flush(struct file* file);
 106
 107 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync);
 108
 109 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 110
 111 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 112 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n);
 113 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n);
 114 #else
 115 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 116 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry);
 117 #endif
 118 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry);
 119 static int yaffs_unlink(struct inode * dir, struct dentry *dentry);
 120 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname);
 121 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode);
 122
 123 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 124 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
 125 #else
 126 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int dev);
 127 #endif
 128 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry);
 129 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 130
 131 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 132 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 133 #else
 134 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 135 #endif
 136 static void yaffs_read_inode (struct inode *inode);
 137
 138 static void yaffs_put_inode (struct inode *inode);
 139 static void yaffs_delete_inode(struct inode *);
 140 static void yaffs_clear_inode(struct inode *);
 141
 142 static int yaffs_readpage(struct file *file, struct page * page);
 143 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 144 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 145 #else
 146 static int yaffs_writepage(struct page *page);
 147 #endif
 148 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 149 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to);
 150
 151 static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen);
 152 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 153
 154
 155
 156 static struct address_space_operations yaffs_file_address_operations = {
 157         .readpage       = yaffs_readpage,
 158         .writepage      = yaffs_writepage,
 159         .prepare_write  = yaffs_prepare_write,
 160         .commit_write   = yaffs_commit_write,
 161 };
 162
 163 static struct file_operations yaffs_file_operations = {
 164         .read           = generic_file_read,
 165         .write          = generic_file_write,
 166         .mmap           = generic_file_mmap,
 167         .flush          = yaffs_file_flush,
 168         .fsync          = yaffs_sync_object,
 169 };
 170
 171 static struct inode_operations yaffs_file_inode_operations = {
 172         .setattr        = yaffs_setattr,
 173 };
 174
 175 static struct inode_operations yaffs_symlink_inode_operations = {
 176         .readlink       = yaffs_readlink,
 177         .follow_link    = yaffs_follow_link,
 178         .setattr        = yaffs_setattr,
 179 };
 180
 181 static struct inode_operations yaffs_dir_inode_operations = {
 182         .create         = yaffs_create,
 183         .lookup         = yaffs_lookup,
 184         .link           = yaffs_link,
 185         .unlink         = yaffs_unlink,
 186         .symlink        = yaffs_symlink,
 187         .mkdir          = yaffs_mkdir,
 188         .rmdir          = yaffs_unlink,
 189         .mknod          = yaffs_mknod,
 190         .rename         = yaffs_rename,
 191         .setattr        = yaffs_setattr,
 192 };
 193
 194 static struct file_operations yaffs_dir_operations = {
 195         .read           = generic_read_dir,
 196         .readdir        = yaffs_readdir,
 197         .fsync          = yaffs_sync_object,
 198 };
 199
 200 static struct super_operations yaffs_super_ops = {
 201         .statfs         = yaffs_statfs,
 202         .read_inode     = yaffs_read_inode,
 203         .put_inode      = yaffs_put_inode,
 204         .put_super      = yaffs_put_super,
 205         .delete_inode   = yaffs_delete_inode,
 206         .clear_inode    = yaffs_clear_inode,
 207 };
 208
 209
 210
 211 static void yaffs_GrossLock(yaffs_Device *dev)
 212 {
 213         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n"));
 214
 215         down(&dev->grossLock);
 216 }
 217
 218 static void yaffs_GrossUnlock(yaffs_Device *dev)
 219 {
 220         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n"));
 221         up(&dev->grossLock);
 222
 223 }
 224
 225 static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
 226 {
 227         unsigned char *alias;
 228         int ret;
 229
 230         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 231
 232
 233         yaffs_GrossLock(dev);
 234
 235         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 236
 237         yaffs_GrossUnlock(dev);
 238
 239         if(!alias)
 240                 return -ENOMEM;
 241
 242         ret = vfs_readlink(dentry, buffer, buflen, alias);
 243         kfree(alias);
 244         return ret;
 245 }
 246
 247 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 248 {
 249         unsigned char *alias;
 250         int ret;
 251         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 252
 253
 254         yaffs_GrossLock(dev);
 255
 256         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 257
 258         yaffs_GrossUnlock(dev);
 259
 260         if(!alias)
 261                 return -ENOMEM;
 262
 263         ret = vfs_follow_link(nd,alias);
 264         kfree(alias);
 265         return ret;
 266 }
 267
 268
 269 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj);
 270
 271 /*
 272  * Lookup is used to find objects in the fs
 273  */
 274 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 275
 276 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n)
 277 #else
 278 static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry)
 279 #endif
 280 {
 281         yaffs_Object *obj;
 282         struct inode *inode = NULL; // NCB 2.5/2.6 needs NULL here
 283
 284         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 285
 286
 287         yaffs_GrossLock(dev);
 288
 289
 290         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name));
 291
 292         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name);
 293
 294         obj = yaffs_GetEquivalentObject(obj); // in case it was a hardlink
 295
 296
 297
 298         if(obj)
 299         {
 300                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId));
 301
 302                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode,0,obj);
 303
 304                 if(inode)
 305                 {
 306                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n"));
 307 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to d_add even if NULL inode */
 308 #if 0
 309                         //dget(dentry); // try to solve directory bug
 310                         d_add(dentry,inode);
 311
 312                         yaffs_GrossUnlock(dev);
 313
 314                         // return dentry;
 315                         return NULL;
 316 #endif
 317                 }
 318
 319         }
 320         else
 321         {
 322                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n"));
 323
 324         }
 325         yaffs_GrossUnlock(dev);
 326
 327 /* added NCB for 2.5/6 compatability - forces add even if inode is NULL which creates dentry hash*/
 328         d_add(dentry,inode);
 329
 330         return NULL;
 331         //      return (ERR_PTR(-EIO));
 332
 333 }
 334
 335 // For now put inode is just for debugging
 336 // Put inode is called when the inode **structure** is put.
 337 static void yaffs_put_inode(struct inode *inode)
 338 {
 339         T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count)));
 340
 341 }
 342
 343 // clear is called to tell the fs to release any per-inode data it holds
 344 static void yaffs_clear_inode(struct inode *inode)
 345 {
 346         yaffs_Object *obj;
 347         yaffs_Device *dev;
 348
 349         obj = yaffs_InodeToObject(inode);
 350
 351         T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 352                 obj ? "object exists" : "null object"));
 353
 354         if(obj)
 355         {
 356                 dev = obj->myDev;
 357                 yaffs_GrossLock(dev);
 358
 359                 // Clear the association between the inode ant the yaffs_Object.
 360                 obj->myInode = NULL;
 361                 inode->u.generic_ip = NULL;
 362
 363                 // If the object freeing was deferred, then the real free happens now.
 364                 // This should fix the inode inconsistency problem.
 365
 366                 yaffs_HandleDeferedFree(obj);
 367
 368                 yaffs_GrossUnlock(dev);
 369         }
 370
 371
 372 }
 373
 374 // delete is called when the link count is zero and the inode
 375 // is put (ie. nobody wants to know about it anymore, time to
 376 // delete the file).
 377 // NB Must call clear_inode()
 378 static void yaffs_delete_inode(struct inode *inode)
 379 {
 380         yaffs_Object *obj = yaffs_InodeToObject(inode);
 381         yaffs_Device *dev;
 382
 383         T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count),
 384                 obj ? "object exists" : "null object"));
 385
 386         if(obj)
 387         {
 388                 dev = obj->myDev;
 389                 yaffs_GrossLock(dev);
 390                 yaffs_DeleteFile(obj);
 391                 yaffs_GrossUnlock(dev);
 392         }
 393         clear_inode(inode);
 394 }
 395
 396
 397 static int yaffs_file_flush(struct file* file)
 398 {
 399         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 400
 401         yaffs_Device *dev = obj->myDev;
 402
 403         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId,
 404                                 obj->dirty ? "dirty" : "clean"));
 405
 406         yaffs_GrossLock(dev);
 407
 408     yaffs_FlushFile(obj,1);
 409
 410         yaffs_GrossUnlock(dev);
 411
 412     return 0;
 413 }
 414
 415
 416
 417 static int yaffs_readpage_nolock(struct file *f, struct page * pg)
 418 {
 419         // Lifted from jffs2
 420
 421         yaffs_Object *obj;
 422         unsigned char *pg_buf;
 423         int ret;
 424
 425         yaffs_Device *dev;
 426
 427         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n",
 428                       (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE));
 429
 430         obj  = yaffs_DentryToObject(f->f_dentry);
 431
 432         dev = obj->myDev;
 433
 434
 435 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 436         BUG_ON(!PageLocked(pg));
 437 #else
 438         if (!PageLocked(pg))
 439                 PAGE_BUG(pg);
 440 #endif
 441
 442         pg_buf = kmap(pg);
 443         /* FIXME: Can kmap fail? */
 444
 445         yaffs_GrossLock(dev);
 446
 447         ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
 448
 449         yaffs_GrossUnlock(dev);
 450
 451         if(ret >= 0) ret = 0;
 452
 453         if (ret) {
 454                 ClearPageUptodate(pg);
 455                 SetPageError(pg);
 456         } else {
 457                 SetPageUptodate(pg);
 458                 ClearPageError(pg);
 459         }
 460
 461         flush_dcache_page(pg);
 462         kunmap(pg);
 463
 464
 465         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n"));
 466         return ret;
 467 }
 468
 469 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 470 {
 471         int ret = yaffs_readpage_nolock(f,pg);
 472         UnlockPage(pg);
 473         return ret;
 474 }
 475
 476 static int yaffs_readpage(struct file *f, struct page * pg)
 477 {
 478         return yaffs_readpage_unlock(f,pg);
 479 }
 480
 481 // writepage inspired by/stolen from smbfs
 482 //
 483
 484 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 485 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 486 #else
 487 static int yaffs_writepage(struct page *page)
 488 #endif
 489 {
 490         struct address_space *mapping = page->mapping;
 491         loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
 492         struct inode *inode;
 493         unsigned long end_index;
 494         char *buffer;
 495         yaffs_Object *obj;
 496         int nWritten = 0;
 497         unsigned nBytes;
 498
 499         if (!mapping)
 500                 BUG();
 501         inode = mapping->host;
 502         if (!inode)
 503                 BUG();
 504
 505         if (offset > inode->i_size)
 506         {
 507                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_writepage at %08x, inode size = %08x!!!\n", (unsigned)(page->index << PAGE_CACHE_SHIFT), (unsigned) inode->i_size));
 508                 T(YAFFS_TRACE_OS,(KERN_DEBUG"                -> don't care!!\n"));
 509                 unlock_page(page);
 510                 return 0;
 511         }
 512
 513         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 514
 515         /* easy case */
 516         if (page->index < end_index)
 517         {
 518                 nBytes = PAGE_CACHE_SIZE;
 519         }
 520         else
 521         {
 522                 nBytes = inode->i_size & (PAGE_CACHE_SIZE-1);
 523         }
 524         //  What's happening here?
 525         ///* OK, are we completely out? */
 526         //if (page->index >= end_index+1 || !offset)
 527         //      return -EIO;
 528
 529         get_page(page);
 530
 531
 532         buffer = kmap(page);
 533
 534         obj = yaffs_InodeToObject(inode);
 535         yaffs_GrossLock(obj->myDev);
 536
 537         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_writepage at %08x, size %08x\n", (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 538         T(YAFFS_TRACE_OS,(KERN_DEBUG"writepag0: obj = %05x, ino = %05x\n", (int) obj->variant.fileVariant.fileSize, (int) inode->i_size));
 539
 540         nWritten = yaffs_WriteDataToFile(obj,buffer,page->index << PAGE_CACHE_SHIFT,nBytes,0);
 541
 542         T(YAFFS_TRACE_OS,(KERN_DEBUG"writepag1: obj = %05x, ino = %05x\n", (int) obj->variant.fileVariant.fileSize, (int) inode->i_size));
 543
 544         yaffs_GrossUnlock(obj->myDev);
 545
 546         kunmap(page);
 547         SetPageUptodate(page);
 548         UnlockPage(page);
 549         put_page(page);
 550
 551         return (nWritten == nBytes) ? 0  : -ENOSPC;
 552 }
 553
 554
 555
 556 static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 557 {
 558
 559         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n"));
 560         if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 561                 return  yaffs_readpage_nolock(f,pg);
 562
 563         return 0;
 564
 565 }
 566
 567 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to)
 568 {
 569
 570         void *addr = page_address(pg) + offset;
 571         loff_t pos = (((loff_t)pg->index) << PAGE_CACHE_SHIFT) + offset;
 572         int nBytes = to - offset;
 573         int nWritten;
 574
 575         unsigned spos = pos;
 576         unsigned saddr = (unsigned)addr;
 577
 578         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes));
 579
 580         nWritten = yaffs_file_write(f,addr, nBytes, &pos);
 581
 582         if(nWritten != nBytes)
 583         {
 584                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d  nBytes %d\n",nWritten,nBytes));
 585                 SetPageError(pg);
 586                 ClearPageUptodate(pg);
 587         }
 588         else
 589         {
 590                 SetPageUptodate(pg);
 591         }
 592
 593         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten));
 594
 595         return nWritten;
 596
 597 }
 598
 599
 600
 601 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 602 {
 603         if (inode && obj)
 604         {
 605                 inode->i_ino = obj->objectId;
 606                 inode->i_mode = obj->yst_mode;
 607                 inode->i_uid = obj->yst_uid;
 608                 inode->i_gid = obj->yst_gid;
 609                 inode->i_blksize = inode->i_sb->s_blocksize;
 610 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 611
 612                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 613                 inode->i_atime.tv_sec = (time_t)(obj->yst_atime);
 614                 inode->i_atime.tv_nsec = 0;
 615                 inode->i_mtime.tv_sec = (time_t)obj->yst_mtime;
 616                 inode->i_mtime.tv_nsec =0;
 617                 inode->i_ctime.tv_sec = (time_t)obj->yst_ctime;
 618                 inode->i_ctime.tv_nsec = 0;
 619 #else
 620                 inode->i_rdev = obj->yst_rdev;
 621                 inode->i_atime = obj->yst_atime;
 622                 inode->i_mtime = obj->yst_mtime;
 623                 inode->i_ctime = obj->yst_ctime;
 624 #endif
 625                 inode->i_size = yaffs_GetObjectFileLength(obj);
 626                 inode->i_blocks = (inode->i_size + 511) >> 9;
 627
 628                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 629
 630                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 631                                 inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count)));
 632
 633                 switch (obj->yst_mode & S_IFMT)
 634                 {
 635                         default: // fifo, device or socket
 636 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 637                                init_special_inode(inode, obj->yst_mode,old_decode_dev(obj->yst_rdev));
 638 #else
 639                                  init_special_inode(inode, obj->yst_mode,(dev_t)(obj->yst_rdev));
 640 #endif
 641                         break;
 642                         case S_IFREG:   // file
 643                                 inode->i_op = &yaffs_file_inode_operations;
 644                                 inode->i_fop = &yaffs_file_operations;
 645                                 inode->i_mapping->a_ops = &yaffs_file_address_operations;
 646                                 break;
 647                         case S_IFDIR:   // directory
 648                                 inode->i_op = &yaffs_dir_inode_operations;
 649                                 inode->i_fop = &yaffs_dir_operations;
 650                                 break;
 651                         case S_IFLNK:   // symlink
 652                                 inode->i_op = &yaffs_symlink_inode_operations;
 653                                 break;
 654                 }
 655
 656
 657                 inode->u.generic_ip = obj;
 658                 obj->myInode = inode;
 659
 660         }
 661         else
 662         {
 663                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n"));
 664         }
 665
 666 }
 667
 668 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Object *obj)
 669 {
 670         struct inode * inode;
 671
 672         if(!sb)
 673         {
 674           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL super_block!!\n"));
 675           return NULL;
 676
 677         }
 678
 679         if(!obj)
 680         {
 681           T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for NULL object!!\n"));
 682           return NULL;
 683
 684         }
 685
 686         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId));
 687
 688         inode = iget(sb,obj->objectId);
 689
 690         // NB Side effect: iget calls back to yaffs_read_inode().
 691         // iget also increments the inode's i_count
 692
 693         return inode;
 694 }
 695
 696 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos)
 697 {
 698         yaffs_Object *obj;
 699         int nWritten,ipos;
 700         struct inode *inode;
 701         yaffs_Device *dev;
 702
 703
 704         obj  = yaffs_DentryToObject(f->f_dentry);
 705
 706         dev = obj->myDev;
 707
 708         yaffs_GrossLock(dev);
 709
 710         inode = f->f_dentry->d_inode;
 711
 712         if(!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
 713         {
 714                 ipos = inode->i_size;
 715         }
 716         else
 717         {
 718                 ipos = *pos;
 719         }
 720
 721
 722         if(!obj)
 723         {
 724                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n"));
 725         }
 726         else
 727         {
 728                 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));
 729         }
 730
 731         nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n,0);
 732
 733         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos));
 734         if(nWritten > 0)
 735         {
 736                 ipos += nWritten;
 737                 *pos = ipos;
 738                 if(ipos > inode->i_size)
 739                 {
 740                         inode->i_size = ipos;
 741                         inode->i_blocks = (ipos + 511)>>9;
 742
 743                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks)));
 744                 }
 745
 746         }
 747         yaffs_GrossUnlock(dev);
 748
 749         return nWritten != n ? -ENOSPC : nWritten;
 750 }
 751
 752
 753
 754 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 755 {
 756         yaffs_Object *obj;
 757         yaffs_Device *dev;
 758         struct inode *inode = f->f_dentry->d_inode;
 759         unsigned long offset, curoffs;
 760         struct list_head *i;
 761         yaffs_Object *l;
 762
 763         char name[YAFFS_MAX_NAME_LENGTH +1];
 764
 765         obj =  yaffs_DentryToObject(f->f_dentry);
 766         dev = obj->myDev;
 767
 768         yaffs_GrossLock(dev);
 769
 770         offset = f->f_pos;
 771
 772         T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset));
 773
 774         if(offset == 0)
 775         {
 776         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino));
 777                 if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0)
 778                 {
 779                         goto out;
 780                 }
 781                 offset++;
 782                 f->f_pos++;
 783         }
 784         if(offset == 1)
 785         {
 786                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino));
 787                 if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0)
 788                 {
 789                         goto out;
 790                 }
 791                 offset++;
 792                 f->f_pos++;
 793         }
 794
 795         curoffs = 1;
 796
 797         list_for_each(i,&obj->variant.directoryVariant.children)
 798         {
 799                 curoffs++;
 800                 if(curoffs >= offset)
 801                 {
 802                         l = list_entry(i, yaffs_Object,siblings);
 803
 804                         yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1);
 805                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l)));
 806
 807                         if(filldir(dirent,
 808                                            name,
 809                                            strlen(name),
 810                                            offset,
 811                                            yaffs_GetObjectInode(l),
 812                                            yaffs_GetObjectType(l))
 813                                            < 0)
 814                         {
 815                                 goto up_and_out;
 816                         }
 817
 818                         offset++;
 819                         f->f_pos++;
 820                 }
 821         }
 822
 823   up_and_out:
 824   out:
 825
 826     yaffs_GrossUnlock(dev);
 827
 828         return 0;
 829 }
 830
 831
 832 /*
 833  * File creation. Allocate an inode, and we're done..
 834  */
 835 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 836 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
 837 #else
 838 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 839 #endif
 840 {
 841         struct inode *inode;
 842
 843         yaffs_Object *obj = NULL;
 844         yaffs_Device *dev;
 845
 846         yaffs_Object *parent = yaffs_InodeToObject(dir);
 847
 848         int error = -ENOSPC;
 849         uid_t uid = current->fsuid;
 850         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
 851
 852         if(parent)
 853         {
 854                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n",
 855                                          parent->objectId,parent->variantType));
 856         }
 857         else
 858         {
 859                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n"));
 860                 return -EPERM;
 861         }
 862
 863         T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n",
 864                                         dentry->d_name.name, mode,rdev));
 865
 866         dev = parent->myDev;
 867
 868         yaffs_GrossLock(dev);
 869
 870         switch (mode & S_IFMT)
 871         {
 872                 default:
 873                         // Special (socket, fifo, device...)
 874                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n"));
 875 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 876                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,uid, gid,old_encode_dev(rdev));
 877 #else
 878                         obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,uid, gid,rdev);
 879 #endif
 880                 break;
 881                 case S_IFREG:   // file
 882                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 883                         obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,uid, gid);
 884                         break;
 885                 case S_IFDIR:   // directory
 886                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n"));
 887                         obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,uid, gid);
 888                         break;
 889                 case S_IFLNK:   // symlink
 890                         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n"));
 891                         obj = NULL; // Do we ever get here?
 892                         break;
 893         }
 894
 895         if(obj)
 896         {
 897                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 898                 d_instantiate(dentry, inode);
 899                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count)));
 900                 error = 0;
 901         }
 902         else
 903         {
 904                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n"));
 905                 error = -ENOMEM;
 906         }
 907
 908         yaffs_GrossUnlock(dev);
 909
 910         return error;
 911 }
 912
 913 static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 914 {
 915         int retVal;
 916         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n"));
 917         retVal =  yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 918 #if 0
 919  // attempt to fix dir bug - didn't work
 920         if(!retVal)
 921         {
 922                 dget(dentry);
 923         }
 924 #endif
 925         return retVal;
 926 }
 927
 928 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 929 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *n)
 930 #else
 931 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 932 #endif
 933 {
 934         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n"));
 935         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 936 }
 937
 938
 939 static int yaffs_unlink(struct inode * dir, struct dentry *dentry)
 940 {
 941         int retVal;
 942
 943         yaffs_Device *dev;
 944
 945
 946         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name));
 947
 948         dev = yaffs_InodeToObject(dir)->myDev;
 949
 950         yaffs_GrossLock(dev);
 951
 952
 953         retVal = yaffs_Unlink(yaffs_InodeToObject(dir),dentry->d_name.name);
 954
 955
 956         yaffs_GrossUnlock(dev);
 957
 958         if( retVal == YAFFS_OK)
 959         {
 960                 dentry->d_inode->i_nlink--;
 961                 mark_inode_dirty(dentry->d_inode);
 962                 return 0;
 963         }
 964         else
 965         {
 966                 return -ENOTEMPTY;
 967         }
 968 }
 969
 970
 971 /*
 972  * Create a link...
 973  */
 974 static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dentry * dentry)
 975 {
 976         struct inode *inode = old_dentry->d_inode;
 977         yaffs_Object *obj = NULL;
 978         yaffs_Object *link=NULL;
 979         yaffs_Device *dev;
 980
 981         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n"));
 982
 983         obj = yaffs_InodeToObject(inode);
 984         dev = obj->myDev;
 985
 986         yaffs_GrossLock(dev);
 987
 988         if (!S_ISDIR(inode->i_mode))    // Don't link directories
 989         {
 990                 link = yaffs_Link(yaffs_InodeToObject(dir),dentry->d_name.name,obj);
 991         }
 992
 993
 994         if(link)
 995         {
 996                 old_dentry->d_inode->i_nlink =  yaffs_GetObjectLinkCount(obj);
 997                 d_instantiate(dentry, old_dentry->d_inode);
 998                 atomic_inc(&old_dentry->d_inode->i_count);
 999                 T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n",
1000                         old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count)));
1001
1002         }
1003
1004         yaffs_GrossUnlock(dev);
1005
1006
1007         if(link)
1008         {
1009
1010                 return 0;
1011         }
1012
1013
1014         return -EPERM;
1015 }
1016
1017
1018 static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
1019 {
1020         yaffs_Object *obj;
1021         yaffs_Device *dev;
1022         uid_t uid = current->fsuid;
1023         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1024
1025         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n"));
1026
1027         dev = yaffs_InodeToObject(dir)->myDev;
1028         yaffs_GrossLock(dev);
1029         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1030                                                          S_IFLNK | S_IRWXUGO, uid, gid,
1031                                                          symname);
1032         yaffs_GrossUnlock(dev);
1033
1034         if(obj)
1035         {
1036
1037                 struct inode* inode;
1038
1039                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1040                 d_instantiate(dentry, inode);
1041                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n"));
1042                 return 0;
1043         }
1044         else
1045         {
1046                 T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n"));
1047
1048         }
1049
1050         return -ENOMEM;
1051 }
1052
1053 static int yaffs_sync_object(struct file * file, struct dentry *dentry, int datasync)
1054 {
1055
1056         yaffs_Object *obj;
1057         yaffs_Device *dev;
1058
1059         obj = yaffs_DentryToObject(dentry);
1060
1061         dev = obj->myDev;
1062
1063         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n"));
1064         yaffs_GrossLock(dev);
1065         yaffs_FlushFile(obj,1);
1066         yaffs_GrossUnlock(dev);
1067         return 0;
1068 }
1069
1070 /*
1071  * The VFS layer already does all the dentry stuff for rename.
1072  *
1073  * NB: POSIX says you can rename an object over an old object of the same name
1074  */
1075 static int yaffs_rename(struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir,struct dentry *new_dentry)
1076 {
1077         yaffs_Device *dev;
1078         int retVal = YAFFS_FAIL;
1079         int removed = 0;
1080         yaffs_Object *target;
1081
1082         dev = yaffs_InodeToObject(old_dir)->myDev;
1083
1084         yaffs_GrossLock(dev);
1085
1086         // Check if the target is an existing directory that is not empty.
1087         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1088
1089         if(target &&
1090            target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1091            !list_empty(&target->variant.directoryVariant.children))
1092         {
1093                 retVal = YAFFS_FAIL;
1094         }
1095         else
1096         {
1097
1098                 // Unlink the target if it exists
1099                 removed = yaffs_Unlink(yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1100
1101
1102                 retVal =  yaffs_RenameObject(yaffs_InodeToObject(old_dir),old_dentry->d_name.name,
1103                                                                         yaffs_InodeToObject(new_dir),new_dentry->d_name.name);
1104
1105         }
1106         yaffs_GrossUnlock(dev);
1107
1108         if(retVal == YAFFS_OK)
1109         {
1110                 if(removed == YAFFS_OK)
1111                 {
1112                         new_dentry->d_inode->i_nlink--;
1113                         mark_inode_dirty(new_dentry->d_inode);
1114                 }
1115
1116                 return 0;
1117         }
1118         else
1119         {
1120                 return -ENOTEMPTY;
1121         }
1122
1123
1124 }
1125
1126 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1127 {
1128         struct inode *inode = dentry->d_inode;
1129         int error;
1130         yaffs_Device *dev;
1131
1132         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId));
1133
1134         if((error = inode_change_ok(inode,attr)) == 0)
1135         {
1136
1137                 dev = yaffs_InodeToObject(inode)->myDev;
1138                 yaffs_GrossLock(dev);
1139                 if(yaffs_SetAttributes(yaffs_InodeToObject(inode),attr) == YAFFS_OK)
1140                 {
1141                         error = 0;
1142                 }
1143                 else
1144                 {
1145                         error = -EPERM;
1146                 }
1147                 yaffs_GrossUnlock(dev);
1148                 if (!error)
1149                         error = inode_setattr(inode,attr);
1150         }
1151         return error;
1152 }
1153
1154 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1155 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1156 #else
1157 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1158 #endif
1159 {
1160
1161
1162         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1163         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n"));
1164
1165         yaffs_GrossLock(dev);
1166
1167
1168         buf->f_type = YAFFS_MAGIC;
1169         buf->f_bsize = sb->s_blocksize;
1170         buf->f_namelen = 255;
1171         if(sb->s_blocksize > dev->nBytesPerChunk)
1172         {
1173
1174                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock/
1175                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1176                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev)/
1177                                                 (sb->s_blocksize/dev->nBytesPerChunk);
1178         }
1179         else
1180         {
1181
1182                 buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock *
1183                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1184                 buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev) *
1185                                                 (dev->nBytesPerChunk/sb->s_blocksize);
1186         }
1187         buf->f_files = 0;
1188         buf->f_ffree = 0;
1189         buf->f_bavail =  buf->f_bfree;
1190
1191         yaffs_GrossUnlock(dev);
1192         return 0;
1193 }
1194
1195 static void yaffs_read_inode (struct inode *inode)
1196 {
1197         // NB This is called as a side effect of other functions and
1198         // thus gross locking should always be in place already.
1199
1200         yaffs_Object *obj ;
1201         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1202
1203         T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino));
1204
1205         obj  = yaffs_FindObjectByNumber(dev,inode->i_ino);
1206
1207         yaffs_FillInodeFromObject(inode,obj);
1208
1209 }
1210
1211 static LIST_HEAD(yaffs_dev_list);
1212
1213 static void yaffs_put_super(struct super_block *sb)
1214 {
1215         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1216
1217         yaffs_GrossLock(dev);
1218         if(dev->putSuperFunc)
1219         {
1220                  dev->putSuperFunc(sb);
1221         }
1222         yaffs_Deinitialise(dev);
1223         yaffs_GrossUnlock(dev);
1224
1225         /* we assume this is protected by lock_kernel() in mount/umount */
1226         list_del(&dev->devList);
1227
1228         kfree(dev);
1229 }
1230
1231
1232 #ifdef CONFIG_YAFFS_YAFFS1
1233
1234 static void  yaffs_MTDPutSuper(struct super_block *sb)
1235 {
1236
1237         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1238
1239         if(mtd->sync)
1240         {
1241                 mtd->sync(mtd);
1242         }
1243
1244         put_mtd_device(mtd);
1245 }
1246
1247 #endif
1248
1249
1250 static struct super_block *yaffs_internal_read_super(int yaffsVersion, struct super_block * sb, void * data, int silent)
1251 {
1252         int nBlocks;
1253         struct inode * inode = NULL;
1254         struct dentry * root;
1255         yaffs_Device *dev = 0;
1256         char devname_buf[BDEVNAME_SIZE+1];
1257         struct mtd_info *mtd;
1258         int err;
1259
1260         sb->s_magic = YAFFS_MAGIC;
1261         sb->s_op = &yaffs_super_ops;
1262
1263         if(!sb)
1264                 printk(KERN_INFO"yaffs: sb is NULL\n");
1265         else if(!sb->s_dev)
1266                 printk(KERN_INFO"yaffs: sb->s_dev is NULL\n");
1267         else if(!yaffs_devname(sb, devname_buf))
1268                 printk(KERN_INFO"yaffs: devname is NULL\n");
1269         else
1270                 printk(KERN_INFO"yaffs: dev is %d name is \"%s\"\n", sb->s_dev, yaffs_devname(sb, devname_buf));
1271
1272
1273
1274         sb->s_blocksize = PAGE_CACHE_SIZE;
1275         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1276         T(YAFFS_TRACE_OS,("yaffs_read_super: Using yaffs%d\n",yaffsVersion));
1277         T(YAFFS_TRACE_OS,("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1278
1279 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1280         T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"));
1281 #endif
1282
1283
1284         T(YAFFS_TRACE_ALWAYS,("yaffs: Attempting MTD mount on %u.%u, \"%s\"\n",
1285          MAJOR(sb->s_dev),MINOR(sb->s_dev), yaffs_devname(sb, devname_buf)));
1286
1287         // Check it's an mtd device.....
1288         if(MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1289         {
1290                 return NULL; // This isn't an mtd device
1291         }
1292
1293         // Get the device
1294         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1295         if (!mtd)
1296         {
1297                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device #%u doesn't appear to exist\n", MINOR(sb->s_dev)));
1298                 return NULL;
1299         }
1300
1301         // Check it's NAND
1302         if(mtd->type != MTD_NANDFLASH)
1303         {
1304                 T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1305                 return NULL;
1306         }
1307
1308         T(YAFFS_TRACE_OS,(" erase %p\n",mtd->erase));
1309         T(YAFFS_TRACE_OS,(" read %p\n",mtd->read));
1310         T(YAFFS_TRACE_OS,(" write %p\n",mtd->write));
1311         T(YAFFS_TRACE_OS,(" readoob %p\n",mtd->read_oob));
1312         T(YAFFS_TRACE_OS,(" writeoob %p\n",mtd->write_oob));
1313         T(YAFFS_TRACE_OS,(" block_isbad %p\n",mtd->block_isbad));
1314         T(YAFFS_TRACE_OS,(" block_markbad %p\n",mtd->block_markbad));
1315         T(YAFFS_TRACE_OS,(" oobblock %d\n",mtd->oobblock));
1316         T(YAFFS_TRACE_OS,(" oobsize %d\n",mtd->oobsize));
1317         T(YAFFS_TRACE_OS,(" erasesize %d\n",mtd->erasesize));
1318         T(YAFFS_TRACE_OS,(" size %d\n",mtd->size));
1319
1320         if(yaffsVersion == 2)
1321         {
1322                 // Check for version 2 style functions
1323                 if(!mtd->erase ||
1324                    !mtd->block_isbad ||
1325                    !mtd->block_markbad ||
1326                    !mtd->read  ||
1327                    !mtd->write ||
1328                    !mtd->write_ecc ||
1329                    !mtd->read_ecc ||
1330                    !mtd->read_oob ||
1331                    !mtd->write_oob )
1332                 {
1333                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1334                         return NULL;
1335                 }
1336
1337                 if(mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1338                    mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE)
1339                 {
1340                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1341                         return NULL;
1342                 }               }
1343         else
1344         {
1345                 // Check for V1 style functions
1346                 if(!mtd->erase ||
1347                    !mtd->read  ||
1348                    !mtd->write ||
1349                    !mtd->write_ecc ||
1350                    !mtd->read_ecc ||
1351                    !mtd->read_oob ||
1352                    !mtd->write_oob )
1353                 {
1354                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support required functions\n"));;
1355                         return NULL;
1356                 }
1357
1358                 if(mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1359                    mtd->oobsize != YAFFS_BYTES_PER_SPARE)
1360                 {
1361                         T(YAFFS_TRACE_ALWAYS,("yaffs: MTD device does not support have the right page sizes\n"));
1362                         return NULL;
1363                 }
1364         }
1365
1366
1367                 // OK, so if we got here, we have an MTD that's NAND and looks
1368                 // like it has the right capabilities
1369                 // Set the yaffs_Device up for mtd
1370
1371 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1372         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1373 #else
1374         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device),GFP_KERNEL);
1375 #endif
1376         if(!dev)
1377         {
1378                 // Deep shit could not allocate device structure
1379                 T(YAFFS_TRACE_ALWAYS,("yaffs_read_super: Failed trying to allocate yaffs_Device. \n"));
1380                 return NULL;
1381         }
1382
1383         memset(dev,0,sizeof(yaffs_Device));
1384         dev->genericDevice = mtd;
1385         dev->name = mtd->name;
1386
1387         // Set up the memory size parameters....
1388
1389         nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1390         dev->startBlock = 0;
1391         dev->endBlock = nBlocks - 1;
1392         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1393         dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1394         dev->nReservedBlocks = 5;
1395         dev->nShortOpCaches = 10; // Enable short op caching
1396
1397
1398         // ... and the functions.
1399         if(yaffsVersion == 2)
1400         {
1401                 dev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND;
1402                 dev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND;
1403                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1404                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1405                 dev->spareBuffer = YMALLOC(mtd->oobsize);
1406                 dev->isYaffs2 = 1;
1407                 dev->nBytesPerChunk = mtd->oobblock;
1408                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1409                 nBlocks = mtd->size / mtd->erasesize;
1410                 dev->startBlock = 0;
1411                 dev->endBlock = nBlocks - 1;
1412         }
1413         else
1414         {
1415                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1416                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1417                 dev->isYaffs2 = 0;
1418         }
1419         // ... and common functions
1420         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1421         dev->initialiseNAND = nandmtd_InitialiseNAND;
1422
1423         dev->putSuperFunc = yaffs_MTDPutSuper;
1424
1425 #ifndef CONFIG_YAFFS_DOES_ECC
1426         dev->useNANDECC = 1;
1427 #endif
1428
1429         /* we assume this is protected by lock_kernel() in mount/umount */
1430         list_add_tail(&dev->devList, &yaffs_dev_list);
1431
1432         init_MUTEX(&dev->grossLock);
1433
1434
1435         yaffs_GrossLock(dev);
1436
1437         err = yaffs_GutsInitialise(dev);
1438
1439         T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised %s\n", (err == YAFFS_OK) ? "OK" : "FAILED"));
1440
1441         // Create root inode
1442         if(err == YAFFS_OK)
1443           inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(dev));
1444
1445         yaffs_GrossUnlock(dev);
1446
1447         if (!inode)
1448                 return NULL;
1449
1450 // added NCB
1451         inode->i_op = & yaffs_dir_inode_operations;
1452         inode->i_fop = & yaffs_dir_operations;
1453
1454         T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n"));
1455
1456
1457         root = d_alloc_root(inode);
1458
1459         T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n"));
1460
1461         if (!root) {
1462                 iput(inode);
1463                 return NULL;
1464         }
1465         sb->s_root = root;
1466
1467         T(YAFFS_TRACE_OS,("yaffs_read_super: done\n"));
1468         return sb;
1469 }
1470
1471
1472
1473 #ifdef CONFIG_YAFFS_YAFFS1
1474
1475 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1476 static int yaffs_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1477 {
1478          return yaffs_internal_read_super(1,sb,data,silent) ? 0 : -1;
1479 }
1480
1481 static struct super_block *yaffs_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1482 {
1483
1484     return get_sb_bdev(fs, flags, dev_name, data, yaffs_internal_read_super_mtd);
1485 }
1486
1487 static struct file_system_type yaffs_fs_type = {
1488         .owner          = THIS_MODULE,
1489         .name           = "yaffs",
1490         .get_sb         = yaffs_read_super,
1491         .kill_sb        = kill_block_super,
1492         .fs_flags       = FS_REQUIRES_DEV,
1493 };
1494 #else
1495 static struct super_block *yaffs_read_super(struct super_block * sb, void * data, int silent)
1496 {
1497         return yaffs_internal_read_super(1,sb,data,silent);
1498 }
1499
1500 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, FS_REQUIRES_DEV);
1501 #endif
1502
1503 #endif // CONFIG_YAFFS_YAFFS1
1504
1505 #ifdef CONFIG_YAFFS_YAFFS2
1506
1507 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1508 static int yaffs2_internal_read_super_mtd(struct super_block * sb, void * data, int silent)
1509 {
1510          return yaffs_internal_read_super(2,sb,data,silent) ? 0 : -1;
1511 }
1512
1513 static struct super_block *yaffs2_read_super(struct file_system_type * fs, int flags, const char *dev_name, void *data)
1514 {
1515
1516     return get_sb_bdev(fs, flags, dev_name, data, yaffs2_internal_read_super_mtd);
1517 }
1518
1519 static struct file_system_type yaffs2_fs_type = {
1520         .owner          = THIS_MODULE,
1521         .name           = "yaffs2",
1522         .get_sb         = yaffs2_read_super,
1523         .kill_sb        = kill_block_super,
1524         .fs_flags       = FS_REQUIRES_DEV,
1525 };
1526 #else
1527 static struct super_block *yaffs2_read_super(struct super_block * sb, void * data, int silent)
1528 {
1529         return yaffs_internal_read_super(2,sb,data,silent);
1530 }
1531
1532 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, FS_REQUIRES_DEV);
1533 #endif
1534
1535 #endif // CONFIG_YAFFS_YAFFS2
1536
1537
1538
1539
1540 static struct proc_dir_entry *my_proc_entry;
1541
1542 static char * yaffs_dump_dev(char *buf,yaffs_Device *dev)
1543 {
1544         buf +=sprintf(buf,"startBlock......... %d\n",dev->startBlock);
1545         buf +=sprintf(buf,"endBlock........... %d\n",dev->endBlock);
1546         buf +=sprintf(buf,"chunkGroupBits..... %d\n",dev->chunkGroupBits);
1547         buf +=sprintf(buf,"chunkGroupSize..... %d\n",dev->chunkGroupSize);
1548         buf +=sprintf(buf,"nErasedBlocks...... %d\n",dev->nErasedBlocks);
1549         buf +=sprintf(buf,"nTnodesCreated..... %d\n",dev->nTnodesCreated);
1550         buf +=sprintf(buf,"nFreeTnodes........ %d\n",dev->nFreeTnodes);
1551         buf +=sprintf(buf,"nObjectsCreated.... %d\n",dev->nObjectsCreated);
1552         buf +=sprintf(buf,"nFreeObjects....... %d\n",dev->nFreeObjects);
1553         buf +=sprintf(buf,"nFreeChunks........ %d\n",dev->nFreeChunks);
1554         buf +=sprintf(buf,"nPageWrites........ %d\n",dev->nPageWrites);
1555         buf +=sprintf(buf,"nPageReads......... %d\n",dev->nPageReads);
1556         buf +=sprintf(buf,"nBlockErasures..... %d\n",dev->nBlockErasures);
1557         buf +=sprintf(buf,"nGCCopies.......... %d\n",dev->nGCCopies);
1558         buf +=sprintf(buf,"garbageCollections. %d\n",dev->garbageCollections);
1559         buf +=sprintf(buf,"passiveGCs......... %d\n",dev->passiveGarbageCollections);
1560         buf +=sprintf(buf,"nRetriedWrites..... %d\n",dev->nRetriedWrites);
1561         buf +=sprintf(buf,"nRetireBlocks...... %d\n",dev->nRetiredBlocks);
1562         buf +=sprintf(buf,"eccFixed........... %d\n",dev->eccFixed);
1563         buf +=sprintf(buf,"eccUnfixed......... %d\n",dev->eccUnfixed);
1564         buf +=sprintf(buf,"tagsEccFixed....... %d\n",dev->tagsEccFixed);
1565         buf +=sprintf(buf,"tagsEccUnfixed..... %d\n",dev->tagsEccUnfixed);
1566         buf +=sprintf(buf,"cacheHits.......... %d\n",dev->cacheHits);
1567         buf +=sprintf(buf,"nDeletedFiles...... %d\n",dev->nDeletedFiles);
1568         buf +=sprintf(buf,"nUnlinkedFiles..... %d\n",dev->nUnlinkedFiles);
1569         buf +=sprintf(buf,"nBackgroudDeletions %d\n",dev->nBackgroundDeletions);
1570         buf +=sprintf(buf,"useNANDECC......... %d\n",dev->useNANDECC);
1571         buf +=sprintf(buf,"isYaffs2........... %d\n",dev->isYaffs2);
1572
1573         return buf;
1574 }
1575
1576 static int  yaffs_proc_read(
1577         char *page,
1578         char **start,
1579         off_t offset,
1580         int count,
1581         int *eof,
1582         void *data
1583         )
1584 {
1585         struct list_head *item;
1586         char *buf = page;
1587         int step = offset;
1588         int n = 0;
1589
1590         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
1591          * We use 'offset' (*ppos) to indicate where we are in devList.
1592          * This also assumes the user has posted a read buffer large
1593          * enough to hold the complete output; but that's life in /proc.
1594          */
1595
1596         *(int *)start = 1;
1597
1598         /* Print header first */
1599         if (step == 0) {
1600                 buf += sprintf(buf, "YAFFS built:" __DATE__ " "__TIME__
1601                 "\n%s\n%s\n", yaffs_fs_c_version, yaffs_guts_c_version);
1602         }
1603
1604         /* hold lock_kernel while traversing yaffs_dev_list */
1605         lock_kernel();
1606
1607         /* Locate and print the Nth entry.  Order N-squared but N is small. */
1608         list_for_each(item, &yaffs_dev_list) {
1609                 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
1610                 if (n < step) {
1611                         n++;
1612                         continue;
1613                 }
1614                 buf += sprintf(buf,"\nDevice %d \"%s\"\n", n, dev->name);
1615                 buf = yaffs_dump_dev(buf, dev);
1616                 break;
1617         }
1618         unlock_kernel();
1619
1620         return buf-page < count ? buf-page : count;
1621 }
1622
1623 // Stuff to handle installation of file systems
1624 struct file_system_to_install
1625 {
1626    struct file_system_type *fst;
1627    int installed;
1628 };
1629
1630 static struct file_system_to_install fs_to_install[] =
1631 {
1632 #ifdef CONFIG_YAFFS_YAFFS1
1633      { &yaffs_fs_type,0},
1634 #endif
1635 #ifdef CONFIG_YAFFS_YAFFS2
1636      { &yaffs2_fs_type,0},
1637 #endif
1638      { NULL,0}
1639 };
1640
1641 static int __init init_yaffs_fs(void)
1642 {
1643         int error = 0;
1644         struct file_system_to_install *fsinst;
1645
1646    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
1647
1648
1649
1650     /* Install the proc_fs entry */
1651     my_proc_entry = create_proc_read_entry("yaffs",
1652                                            S_IRUGO | S_IFREG,
1653                                            &proc_root,
1654                                            yaffs_proc_read,
1655                                            NULL);
1656     if(!my_proc_entry)
1657     {
1658        return -ENOMEM;
1659     }
1660
1661
1662
1663     // Now add the file system entries
1664
1665     fsinst = fs_to_install;
1666
1667     while(fsinst->fst && !error)
1668     {
1669       error = register_filesystem(fsinst->fst);
1670       if(!error)
1671       {
1672           fsinst->installed = 1;
1673       }
1674       fsinst++;
1675     }
1676
1677     // Any errors? uninstall
1678     if(error)
1679     {
1680             fsinst = fs_to_install;
1681
1682             while(fsinst->fst)
1683             {
1684               if(fsinst->installed)
1685               {
1686                 unregister_filesystem(fsinst->fst);
1687                 fsinst->installed = 0;
1688               }
1689               fsinst++;
1690             }
1691     }
1692
1693     return error;
1694 }
1695
1696 static void __exit exit_yaffs_fs(void)
1697 {
1698
1699    struct file_system_to_install *fsinst;
1700
1701    T(YAFFS_TRACE_ALWAYS,("yaffs " __DATE__ " " __TIME__ " removing. \n"));
1702
1703    remove_proc_entry("yaffs",&proc_root);
1704
1705     fsinst = fs_to_install;
1706
1707     while(fsinst->fst)
1708     {
1709       if(fsinst->installed)
1710       {
1711         unregister_filesystem(fsinst->fst);
1712         fsinst->installed = 0;
1713       }
1714       fsinst++;
1715     }
1716
1717 }
1718
1719 module_init(init_yaffs_fs)
1720 module_exit(exit_yaffs_fs)
1721
1722 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
1723 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002,2003,2004");
1724 MODULE_LICENSE("GPL");
1725
1726