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
  19  *         this superblock
  20  * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this
  21  *         superblock
  22  * >> inode->u.generic_ip points to the associated yaffs_Object.
  23  *
  24  * Acknowledgements:
  25  * * Luc van OostenRyck for numerous patches.
  26  * * Nick Bane for numerous patches.
  27  * * Nick Bane for 2.5/2.6 integration.
  28  * * Andras Toth for mknod rdev issue.
  29  * * Michael Fischer for finding the problem with inode inconsistency.
  30  * * Some code bodily lifted from JFFS2.
  31  */
  32
  33 const char *yaffs_fs_c_version =
  34     "$Id: yaffs_fs.c,v 1.39 2006-01-24 22:22:52 tpoynor Exp $";
  35 extern const char *yaffs_guts_c_version;
  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 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  53
  54 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  55 #include <asm/statfs.h>
  56 #define UnlockPage(p) unlock_page(p)
  57 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  58
  59 /* FIXME: use sb->s_id instead ? */
  60 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)
  61
  62 #else
  63
  64 #include <linux/locks.h>
  65 #define BDEVNAME_SIZE           0
  66 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
  67
  68 #endif
  69
  70 #include <asm/uaccess.h>
  71
  72 #include "yportenv.h"
  73 #include "yaffs_guts.h"
  74
  75 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS /* | 0xFFFFFFFF */;
  76
  77 #include <linux/mtd/mtd.h>
  78 #include "yaffs_mtdif.h"
  79 #include "yaffs_mtdif2.h"
  80
  81 /*#define T(x) printk x */
  82
  83 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip))
  84 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
  85
  86 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  87 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
  88 #else
  89 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
  90 #endif
  91
  92 static void yaffs_put_super(struct super_block *sb);
  93
  94 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
  95                                 loff_t * pos);
  96
  97 static int yaffs_file_flush(struct file *file);
  98
  99 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 100                              int datasync);
 101
 102 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 103
 104 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 105 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 106                         struct nameidata *n);
 107 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 108                                    struct nameidata *n);
 109 #else
 110 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 111 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 112 #endif
 113 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 114                       struct dentry *dentry);
 115 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 116 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 117                          const char *symname);
 118 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 119
 120 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 121 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 122                        dev_t dev);
 123 #else
 124 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 125                        int dev);
 126 #endif
 127 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 128                         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,
 149                                unsigned offset, unsigned to);
 150 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 151                               unsigned to);
 152
 153 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 154                           int buflen);
 155 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 156 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 157 #else
 158 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 159 #endif
 160
 161 static struct address_space_operations yaffs_file_address_operations = {
 162         .readpage = yaffs_readpage,
 163         .writepage = yaffs_writepage,
 164         .prepare_write = yaffs_prepare_write,
 165         .commit_write = yaffs_commit_write,
 166 };
 167
 168 static struct file_operations yaffs_file_operations = {
 169         .read = generic_file_read,
 170         .write = generic_file_write,
 171         .mmap = generic_file_mmap,
 172         .flush = yaffs_file_flush,
 173         .fsync = yaffs_sync_object,
 174 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 175         .sendfile = generic_file_sendfile,
 176 #endif
 177
 178 };
 179
 180 static struct inode_operations yaffs_file_inode_operations = {
 181         .setattr = yaffs_setattr,
 182 };
 183
 184 static struct inode_operations yaffs_symlink_inode_operations = {
 185         .readlink = yaffs_readlink,
 186         .follow_link = yaffs_follow_link,
 187         .setattr = yaffs_setattr,
 188 };
 189
 190 static struct inode_operations yaffs_dir_inode_operations = {
 191         .create = yaffs_create,
 192         .lookup = yaffs_lookup,
 193         .link = yaffs_link,
 194         .unlink = yaffs_unlink,
 195         .symlink = yaffs_symlink,
 196         .mkdir = yaffs_mkdir,
 197         .rmdir = yaffs_unlink,
 198         .mknod = yaffs_mknod,
 199         .rename = yaffs_rename,
 200         .setattr = yaffs_setattr,
 201 };
 202
 203 static struct file_operations yaffs_dir_operations = {
 204         .read = generic_read_dir,
 205         .readdir = yaffs_readdir,
 206         .fsync = yaffs_sync_object,
 207 };
 208
 209 static struct super_operations yaffs_super_ops = {
 210         .statfs = yaffs_statfs,
 211         .read_inode = yaffs_read_inode,
 212         .put_inode = yaffs_put_inode,
 213         .put_super = yaffs_put_super,
 214         .delete_inode = yaffs_delete_inode,
 215         .clear_inode = yaffs_clear_inode,
 216 };
 217
 218 static void yaffs_GrossLock(yaffs_Device * dev)
 219 {
 220         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs locking\n"));
 221
 222         down(&dev->grossLock);
 223 }
 224
 225 static void yaffs_GrossUnlock(yaffs_Device * dev)
 226 {
 227         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs unlocking\n"));
 228         up(&dev->grossLock);
 229
 230 }
 231
 232 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 233                           int buflen)
 234 {
 235         unsigned char *alias;
 236         int ret;
 237
 238         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 239
 240         yaffs_GrossLock(dev);
 241
 242         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 243
 244         yaffs_GrossUnlock(dev);
 245
 246         if (!alias)
 247                 return -ENOMEM;
 248
 249         ret = vfs_readlink(dentry, buffer, buflen, alias);
 250         kfree(alias);
 251         return ret;
 252 }
 253
 254 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 255 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 256 #else
 257 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 258 #endif
 259 {
 260         unsigned char *alias;
 261         int ret;
 262         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 263
 264         yaffs_GrossLock(dev);
 265
 266         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 267
 268         yaffs_GrossUnlock(dev);
 269
 270         if (!alias)
 271         {
 272                 ret = -ENOMEM;
 273                 goto out;
 274         }
 275
 276         ret = vfs_follow_link(nd, alias);
 277         kfree(alias);
 278 out:
 279 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 280         return ERR_PTR (ret);
 281 #else
 282         return ret;
 283 #endif
 284 }
 285
 286 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 287                               yaffs_Object * obj);
 288
 289 /*
 290  * Lookup is used to find objects in the fs
 291  */
 292 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 293
 294 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 295                                    struct nameidata *n)
 296 #else
 297 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 298 #endif
 299 {
 300         yaffs_Object *obj;
 301         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 302
 303         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 304
 305         yaffs_GrossLock(dev);
 306
 307         T(YAFFS_TRACE_OS,
 308           (KERN_DEBUG "yaffs_lookup for %d:%s\n",
 309            yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 310
 311         obj =
 312             yaffs_FindObjectByName(yaffs_InodeToObject(dir),
 313                                    dentry->d_name.name);
 314
 315         obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
 316
 317         /* Can't hold gross lock when calling yaffs_get_inode() */
 318         yaffs_GrossUnlock(dev);
 319
 320         if (obj) {
 321                 T(YAFFS_TRACE_OS,
 322                   (KERN_DEBUG "yaffs_lookup found %d\n", obj->objectId));
 323
 324                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 325
 326                 if (inode) {
 327                         T(YAFFS_TRACE_OS,
 328                           (KERN_DEBUG "yaffs_loookup dentry \n"));
 329 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 330  * d_add even if NULL inode */
 331 #if 0
 332                         /*dget(dentry); // try to solve directory bug */
 333                         d_add(dentry, inode);
 334
 335                         /* return dentry; */
 336                         return NULL;
 337 #endif
 338                 }
 339
 340         } else {
 341                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_lookup not found\n"));
 342
 343         }
 344
 345 /* added NCB for 2.5/6 compatability - forces add even if inode is
 346  * NULL which creates dentry hash */
 347         d_add(dentry, inode);
 348
 349         return NULL;
 350         /*      return (ERR_PTR(-EIO)); */
 351
 352 }
 353
 354 /* For now put inode is just for debugging
 355  * Put inode is called when the inode **structure** is put.
 356  */
 357 static void yaffs_put_inode(struct inode *inode)
 358 {
 359         T(YAFFS_TRACE_OS,
 360           ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 361            atomic_read(&inode->i_count)));
 362
 363 }
 364
 365 /* clear is called to tell the fs to release any per-inode data it holds */
 366 static void yaffs_clear_inode(struct inode *inode)
 367 {
 368         yaffs_Object *obj;
 369         yaffs_Device *dev;
 370
 371         obj = yaffs_InodeToObject(inode);
 372
 373         T(YAFFS_TRACE_OS,
 374           ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 375            atomic_read(&inode->i_count),
 376            obj ? "object exists" : "null object"));
 377
 378         if (obj) {
 379                 dev = obj->myDev;
 380                 yaffs_GrossLock(dev);
 381
 382                 /* Clear the association between the inode and
 383                  * the yaffs_Object.
 384                  */
 385                 obj->myInode = NULL;
 386                 inode->u.generic_ip = NULL;
 387
 388                 /* If the object freeing was deferred, then the real
 389                  * free happens now.
 390                  * This should fix the inode inconsistency problem.
 391                  */
 392
 393                 yaffs_HandleDeferedFree(obj);
 394
 395                 yaffs_GrossUnlock(dev);
 396         }
 397
 398 }
 399
 400 /* delete is called when the link count is zero and the inode
 401  * is put (ie. nobody wants to know about it anymore, time to
 402  * delete the file).
 403  * NB Must call clear_inode()
 404  */
 405 static void yaffs_delete_inode(struct inode *inode)
 406 {
 407         yaffs_Object *obj = yaffs_InodeToObject(inode);
 408         yaffs_Device *dev;
 409
 410         T(YAFFS_TRACE_OS,
 411           ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 412            atomic_read(&inode->i_count),
 413            obj ? "object exists" : "null object"));
 414
 415         if (obj) {
 416                 dev = obj->myDev;
 417                 yaffs_GrossLock(dev);
 418                 yaffs_DeleteFile(obj);
 419                 yaffs_GrossUnlock(dev);
 420         }
 421 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 422         truncate_inode_pages (&inode->i_data, 0);
 423 #endif
 424         clear_inode(inode);
 425 }
 426
 427 static int yaffs_file_flush(struct file *file)
 428 {
 429         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 430
 431         yaffs_Device *dev = obj->myDev;
 432
 433         T(YAFFS_TRACE_OS,
 434           (KERN_DEBUG "yaffs_file_flush object %d (%s)\n", obj->objectId,
 435            obj->dirty ? "dirty" : "clean"));
 436
 437         yaffs_GrossLock(dev);
 438
 439         yaffs_FlushFile(obj, 1);
 440
 441         yaffs_GrossUnlock(dev);
 442
 443         return 0;
 444 }
 445
 446 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 447 {
 448         /* Lifted from jffs2 */
 449
 450         yaffs_Object *obj;
 451         unsigned char *pg_buf;
 452         int ret;
 453
 454         yaffs_Device *dev;
 455
 456         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage at %08x, size %08x\n",
 457                            (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 458                            (unsigned)PAGE_CACHE_SIZE));
 459
 460         obj = yaffs_DentryToObject(f->f_dentry);
 461
 462         dev = obj->myDev;
 463
 464 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 465         BUG_ON(!PageLocked(pg));
 466 #else
 467         if (!PageLocked(pg))
 468                 PAGE_BUG(pg);
 469 #endif
 470
 471         pg_buf = kmap(pg);
 472         /* FIXME: Can kmap fail? */
 473
 474         yaffs_GrossLock(dev);
 475
 476         ret =
 477             yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT,
 478                                    PAGE_CACHE_SIZE);
 479
 480         yaffs_GrossUnlock(dev);
 481
 482         if (ret >= 0)
 483                 ret = 0;
 484
 485         if (ret) {
 486                 ClearPageUptodate(pg);
 487                 SetPageError(pg);
 488         } else {
 489                 SetPageUptodate(pg);
 490                 ClearPageError(pg);
 491         }
 492
 493         flush_dcache_page(pg);
 494         kunmap(pg);
 495
 496         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage done\n"));
 497         return ret;
 498 }
 499
 500 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 501 {
 502         int ret = yaffs_readpage_nolock(f, pg);
 503         UnlockPage(pg);
 504         return ret;
 505 }
 506
 507 static int yaffs_readpage(struct file *f, struct page *pg)
 508 {
 509         return yaffs_readpage_unlock(f, pg);
 510 }
 511
 512 /* writepage inspired by/stolen from smbfs */
 513
 514 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 515 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 516 #else
 517 static int yaffs_writepage(struct page *page)
 518 #endif
 519 {
 520         struct address_space *mapping = page->mapping;
 521         loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
 522         struct inode *inode;
 523         unsigned long end_index;
 524         char *buffer;
 525         yaffs_Object *obj;
 526         int nWritten = 0;
 527         unsigned nBytes;
 528
 529         if (!mapping)
 530                 BUG();
 531         inode = mapping->host;
 532         if (!inode)
 533                 BUG();
 534
 535         if (offset > inode->i_size) {
 536                 T(YAFFS_TRACE_OS,
 537                   (KERN_DEBUG
 538                    "yaffs_writepage at %08x, inode size = %08x!!!\n",
 539                    (unsigned)(page->index << PAGE_CACHE_SHIFT),
 540                    (unsigned)inode->i_size));
 541                 T(YAFFS_TRACE_OS,
 542                   (KERN_DEBUG "                -> don't care!!\n"));
 543                 unlock_page(page);
 544                 return 0;
 545         }
 546
 547         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 548
 549         /* easy case */
 550         if (page->index < end_index) {
 551                 nBytes = PAGE_CACHE_SIZE;
 552         } else {
 553                 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
 554         }
 555
 556         get_page(page);
 557
 558         buffer = kmap(page);
 559
 560         obj = yaffs_InodeToObject(inode);
 561         yaffs_GrossLock(obj->myDev);
 562
 563         T(YAFFS_TRACE_OS,
 564           (KERN_DEBUG "yaffs_writepage at %08x, size %08x\n",
 565            (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 566         T(YAFFS_TRACE_OS,
 567           (KERN_DEBUG "writepag0: obj = %05x, ino = %05x\n",
 568            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 569
 570         nWritten =
 571             yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT,
 572                                   nBytes, 0);
 573
 574         T(YAFFS_TRACE_OS,
 575           (KERN_DEBUG "writepag1: obj = %05x, ino = %05x\n",
 576            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 577
 578         yaffs_GrossUnlock(obj->myDev);
 579
 580         kunmap(page);
 581         SetPageUptodate(page);
 582         UnlockPage(page);
 583         put_page(page);
 584
 585         return (nWritten == nBytes) ? 0 : -ENOSPC;
 586 }
 587
 588 static int yaffs_prepare_write(struct file *f, struct page *pg,
 589                                unsigned offset, unsigned to)
 590 {
 591
 592         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
 593         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 594                 return yaffs_readpage_nolock(f, pg);
 595
 596         return 0;
 597
 598 }
 599
 600 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 601                               unsigned to)
 602 {
 603
 604         void *addr = page_address(pg) + offset;
 605         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
 606         int nBytes = to - offset;
 607         int nWritten;
 608
 609         unsigned spos = pos;
 610         unsigned saddr = (unsigned)addr;
 611
 612         T(YAFFS_TRACE_OS,
 613           (KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
 614            spos, nBytes));
 615
 616         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
 617
 618         if (nWritten != nBytes) {
 619                 T(YAFFS_TRACE_OS,
 620                   (KERN_DEBUG
 621                    "yaffs_commit_write not same size nWritten %d  nBytes %d\n",
 622                    nWritten, nBytes));
 623                 SetPageError(pg);
 624                 ClearPageUptodate(pg);
 625         } else {
 626                 SetPageUptodate(pg);
 627         }
 628
 629         T(YAFFS_TRACE_OS,
 630           (KERN_DEBUG "yaffs_commit_write returning %d\n",
 631            nWritten == nBytes ? 0 : -1));
 632
 633         return nWritten == nBytes ? 0 : -1;
 634
 635 }
 636
 637 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
 638 {
 639         if (inode && obj) {
 640                 inode->i_ino = obj->objectId;
 641                 inode->i_mode = obj->yst_mode;
 642                 inode->i_uid = obj->yst_uid;
 643                 inode->i_gid = obj->yst_gid;
 644                 inode->i_blksize = inode->i_sb->s_blocksize;
 645 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 646
 647                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 648                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
 649                 inode->i_atime.tv_nsec = 0;
 650                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
 651                 inode->i_mtime.tv_nsec = 0;
 652                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
 653                 inode->i_ctime.tv_nsec = 0;
 654 #else
 655                 inode->i_rdev = obj->yst_rdev;
 656                 inode->i_atime = obj->yst_atime;
 657                 inode->i_mtime = obj->yst_mtime;
 658                 inode->i_ctime = obj->yst_ctime;
 659 #endif
 660                 inode->i_size = yaffs_GetObjectFileLength(obj);
 661                 inode->i_blocks = (inode->i_size + 511) >> 9;
 662
 663                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 664
 665                 T(YAFFS_TRACE_OS,
 666                   (KERN_DEBUG
 667                    "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 668                    inode->i_mode, inode->i_uid, inode->i_gid,
 669                    (int)inode->i_size, atomic_read(&inode->i_count)));
 670
 671                 switch (obj->yst_mode & S_IFMT) {
 672                 default:        /* fifo, device or socket */
 673 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 674                         init_special_inode(inode, obj->yst_mode,
 675                                            old_decode_dev(obj->yst_rdev));
 676 #else
 677                         init_special_inode(inode, obj->yst_mode,
 678                                            (dev_t) (obj->yst_rdev));
 679 #endif
 680                         break;
 681                 case S_IFREG:   /* file */
 682                         inode->i_op = &yaffs_file_inode_operations;
 683                         inode->i_fop = &yaffs_file_operations;
 684                         inode->i_mapping->a_ops =
 685                             &yaffs_file_address_operations;
 686                         break;
 687                 case S_IFDIR:   /* directory */
 688                         inode->i_op = &yaffs_dir_inode_operations;
 689                         inode->i_fop = &yaffs_dir_operations;
 690                         break;
 691                 case S_IFLNK:   /* symlink */
 692                         inode->i_op = &yaffs_symlink_inode_operations;
 693                         break;
 694                 }
 695
 696                 inode->u.generic_ip = obj;
 697                 obj->myInode = inode;
 698
 699         } else {
 700                 T(YAFFS_TRACE_OS,
 701                   (KERN_DEBUG "yaffs_FileInode invalid parameters\n"));
 702         }
 703
 704 }
 705
 706 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 707                               yaffs_Object * obj)
 708 {
 709         struct inode *inode;
 710
 711         if (!sb) {
 712                 T(YAFFS_TRACE_OS,
 713                   (KERN_DEBUG "yaffs_get_inode for NULL super_block!!\n"));
 714                 return NULL;
 715
 716         }
 717
 718         if (!obj) {
 719                 T(YAFFS_TRACE_OS,
 720                   (KERN_DEBUG "yaffs_get_inode for NULL object!!\n"));
 721                 return NULL;
 722
 723         }
 724
 725         T(YAFFS_TRACE_OS,
 726           (KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId));
 727
 728         inode = iget(sb, obj->objectId);
 729
 730         /* NB Side effect: iget calls back to yaffs_read_inode(). */
 731         /* iget also increments the inode's i_count */
 732         /* NB You can't be holding grossLock or deadlock will happen! */
 733
 734         return inode;
 735 }
 736
 737 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 738                                 loff_t * pos)
 739 {
 740         yaffs_Object *obj;
 741         int nWritten, ipos;
 742         struct inode *inode;
 743         yaffs_Device *dev;
 744
 745         obj = yaffs_DentryToObject(f->f_dentry);
 746
 747         dev = obj->myDev;
 748
 749         yaffs_GrossLock(dev);
 750
 751         inode = f->f_dentry->d_inode;
 752
 753         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) {
 754                 ipos = inode->i_size;
 755         } else {
 756                 ipos = *pos;
 757         }
 758
 759         if (!obj) {
 760                 T(YAFFS_TRACE_OS,
 761                   (KERN_DEBUG "yaffs_file_write: hey obj is null!\n"));
 762         } else {
 763                 T(YAFFS_TRACE_OS,
 764                   (KERN_DEBUG
 765                    "yaffs_file_write about to write writing %d bytes"
 766                    "to object %d at %d\n",
 767                    n, obj->objectId, ipos));
 768         }
 769
 770         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
 771
 772         T(YAFFS_TRACE_OS,
 773           (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n",
 774            n, nWritten, ipos));
 775         if (nWritten > 0) {
 776                 ipos += nWritten;
 777                 *pos = ipos;
 778                 if (ipos > inode->i_size) {
 779                         inode->i_size = ipos;
 780                         inode->i_blocks = (ipos + 511) >> 9;
 781
 782                         T(YAFFS_TRACE_OS,
 783                           (KERN_DEBUG
 784                            "yaffs_file_write size updated to %d bytes, "
 785                            "%d blocks\n",
 786                            ipos, (int)(inode->i_blocks)));
 787                 }
 788
 789         }
 790         yaffs_GrossUnlock(dev);
 791
 792         return nWritten != n ? -ENOSPC : nWritten;
 793 }
 794
 795 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 796 {
 797         yaffs_Object *obj;
 798         yaffs_Device *dev;
 799         struct inode *inode = f->f_dentry->d_inode;
 800         unsigned long offset, curoffs;
 801         struct list_head *i;
 802         yaffs_Object *l;
 803
 804         char name[YAFFS_MAX_NAME_LENGTH + 1];
 805
 806         obj = yaffs_DentryToObject(f->f_dentry);
 807         dev = obj->myDev;
 808
 809         yaffs_GrossLock(dev);
 810
 811         offset = f->f_pos;
 812
 813         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
 814
 815         if (offset == 0) {
 816                 T(YAFFS_TRACE_OS,
 817                   (KERN_DEBUG "yaffs_readdir: entry . ino %d \n",
 818                    (int)inode->i_ino));
 819                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR)
 820                     < 0) {
 821                         goto out;
 822                 }
 823                 offset++;
 824                 f->f_pos++;
 825         }
 826         if (offset == 1) {
 827                 T(YAFFS_TRACE_OS,
 828                   (KERN_DEBUG "yaffs_readdir: entry .. ino %d \n",
 829                    (int)f->f_dentry->d_parent->d_inode->i_ino));
 830                 if (filldir
 831                     (dirent, "..", 2, offset,
 832                      f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 833                         goto out;
 834                 }
 835                 offset++;
 836                 f->f_pos++;
 837         }
 838
 839         curoffs = 1;
 840
 841         list_for_each(i, &obj->variant.directoryVariant.children) {
 842                 curoffs++;
 843                 if (curoffs >= offset) {
 844                         l = list_entry(i, yaffs_Object, siblings);
 845
 846                         yaffs_GetObjectName(l, name,
 847                                             YAFFS_MAX_NAME_LENGTH + 1);
 848                         T(YAFFS_TRACE_OS,
 849                           (KERN_DEBUG "yaffs_readdir: %s inode %d\n", name,
 850                            yaffs_GetObjectInode(l)));
 851
 852                         if (filldir(dirent,
 853                                     name,
 854                                     strlen(name),
 855                                     offset,
 856                                     yaffs_GetObjectInode(l),
 857                                     yaffs_GetObjectType(l))
 858                             < 0) {
 859                                 goto up_and_out;
 860                         }
 861
 862                         offset++;
 863                         f->f_pos++;
 864                 }
 865         }
 866
 867       up_and_out:
 868       out:
 869
 870         yaffs_GrossUnlock(dev);
 871
 872         return 0;
 873 }
 874
 875 /*
 876  * File creation. Allocate an inode, and we're done..
 877  */
 878 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 879 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 880                        dev_t rdev)
 881 #else
 882 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 883                        int rdev)
 884 #endif
 885 {
 886         struct inode *inode;
 887
 888         yaffs_Object *obj = NULL;
 889         yaffs_Device *dev;
 890
 891         yaffs_Object *parent = yaffs_InodeToObject(dir);
 892
 893         int error = -ENOSPC;
 894         uid_t uid = current->fsuid;
 895         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
 896
 897         if (parent) {
 898                 T(YAFFS_TRACE_OS,
 899                   (KERN_DEBUG "yaffs_mknod: parent object %d type %d\n",
 900                    parent->objectId, parent->variantType));
 901         } else {
 902                 T(YAFFS_TRACE_OS,
 903                   (KERN_DEBUG "yaffs_mknod: could not get parent object\n"));
 904                 return -EPERM;
 905         }
 906
 907         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
 908                            "mode %x dev %x\n",
 909                            dentry->d_name.name, mode, rdev));
 910
 911         dev = parent->myDev;
 912
 913         yaffs_GrossLock(dev);
 914
 915         switch (mode & S_IFMT) {
 916         default:
 917                 /* Special (socket, fifo, device...) */
 918                 T(YAFFS_TRACE_OS, (KERN_DEBUG
 919                                    "yaffs_mknod: making special\n"));
 920 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 921                 obj =
 922                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
 923                                        gid, old_encode_dev(rdev));
 924 #else
 925                 obj =
 926                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
 927                                        gid, rdev);
 928 #endif
 929                 break;
 930         case S_IFREG:           /* file          */
 931                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
 932                 obj =
 933                     yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
 934                                     gid);
 935                 break;
 936         case S_IFDIR:           /* directory */
 937                 T(YAFFS_TRACE_OS,
 938                   (KERN_DEBUG "yaffs_mknod: making directory\n"));
 939                 obj =
 940                     yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
 941                                          uid, gid);
 942                 break;
 943         case S_IFLNK:           /* symlink */
 944                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
 945                 obj = NULL;     /* Do we ever get here? */
 946                 break;
 947         }
 948
 949         /* Can not call yaffs_get_inode() with gross lock held */
 950         yaffs_GrossUnlock(dev);
 951
 952         if (obj) {
 953                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
 954                 d_instantiate(dentry, inode);
 955                 T(YAFFS_TRACE_OS,
 956                   (KERN_DEBUG "yaffs_mknod created object %d count = %d\n",
 957                    obj->objectId, atomic_read(&inode->i_count)));
 958                 error = 0;
 959         } else {
 960                 T(YAFFS_TRACE_OS,
 961                   (KERN_DEBUG "yaffs_mknod failed making object\n"));
 962                 error = -ENOMEM;
 963         }
 964
 965         return error;
 966 }
 967
 968 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 969 {
 970         int retVal;
 971         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mkdir\n"));
 972         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 973 #if 0
 974         /* attempt to fix dir bug - didn't work */
 975         if (!retVal) {
 976                 dget(dentry);
 977         }
 978 #endif
 979         return retVal;
 980 }
 981
 982 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 983 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 984                         struct nameidata *n)
 985 #else
 986 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 987 #endif
 988 {
 989         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_create\n"));
 990         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 991 }
 992
 993 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
 994 {
 995         int retVal;
 996
 997         yaffs_Device *dev;
 998
 999         T(YAFFS_TRACE_OS,
1000           (KERN_DEBUG "yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1001            dentry->d_name.name));
1002
1003         dev = yaffs_InodeToObject(dir)->myDev;
1004
1005         yaffs_GrossLock(dev);
1006
1007         retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1008
1009         yaffs_GrossUnlock(dev);
1010
1011         if (retVal == YAFFS_OK) {
1012                 dentry->d_inode->i_nlink--;
1013                 mark_inode_dirty(dentry->d_inode);
1014                 return 0;
1015         } else {
1016                 return -ENOTEMPTY;
1017         }
1018 }
1019
1020 /*
1021  * Create a link...
1022  */
1023 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1024                       struct dentry *dentry)
1025 {
1026         struct inode *inode = old_dentry->d_inode;
1027         yaffs_Object *obj = NULL;
1028         yaffs_Object *link = NULL;
1029         yaffs_Device *dev;
1030
1031         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_link\n"));
1032
1033         obj = yaffs_InodeToObject(inode);
1034         dev = obj->myDev;
1035
1036         yaffs_GrossLock(dev);
1037
1038         if (!S_ISDIR(inode->i_mode))    /* Don't link directories */
1039         {
1040                 link =
1041                     yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1042                                obj);
1043         }
1044
1045         if (link) {
1046                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1047                 d_instantiate(dentry, old_dentry->d_inode);
1048                 atomic_inc(&old_dentry->d_inode->i_count);
1049                 T(YAFFS_TRACE_OS,
1050                   (KERN_DEBUG "yaffs_link link count %d i_count %d\n",
1051                    old_dentry->d_inode->i_nlink,
1052                    atomic_read(&old_dentry->d_inode->i_count)));
1053
1054         }
1055
1056         yaffs_GrossUnlock(dev);
1057
1058         if (link) {
1059
1060                 return 0;
1061         }
1062
1063         return -EPERM;
1064 }
1065
1066 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1067                          const char *symname)
1068 {
1069         yaffs_Object *obj;
1070         yaffs_Device *dev;
1071         uid_t uid = current->fsuid;
1072         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1073
1074         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_symlink\n"));
1075
1076         dev = yaffs_InodeToObject(dir)->myDev;
1077         yaffs_GrossLock(dev);
1078         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1079                                  S_IFLNK | S_IRWXUGO, uid, gid, symname);
1080         yaffs_GrossUnlock(dev);
1081
1082         if (obj) {
1083
1084                 struct inode *inode;
1085
1086                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1087                 d_instantiate(dentry, inode);
1088                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink created OK\n"));
1089                 return 0;
1090         } else {
1091                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink not created\n"));
1092
1093         }
1094
1095         return -ENOMEM;
1096 }
1097
1098 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1099                              int datasync)
1100 {
1101
1102         yaffs_Object *obj;
1103         yaffs_Device *dev;
1104
1105         obj = yaffs_DentryToObject(dentry);
1106
1107         dev = obj->myDev;
1108
1109         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_object\n"));
1110         yaffs_GrossLock(dev);
1111         yaffs_FlushFile(obj, 1);
1112         yaffs_GrossUnlock(dev);
1113         return 0;
1114 }
1115
1116 /*
1117  * The VFS layer already does all the dentry stuff for rename.
1118  *
1119  * NB: POSIX says you can rename an object over an old object of the same name
1120  */
1121 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1122                         struct inode *new_dir, struct dentry *new_dentry)
1123 {
1124         yaffs_Device *dev;
1125         int retVal = YAFFS_FAIL;
1126         yaffs_Object *target;
1127
1128         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_rename\n"));
1129         dev = yaffs_InodeToObject(old_dir)->myDev;
1130
1131         yaffs_GrossLock(dev);
1132
1133         /* Check if the target is an existing directory that is not empty. */
1134         target =
1135             yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1136                                    new_dentry->d_name.name);
1137
1138
1139
1140         if (target &&
1141             target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1142             !list_empty(&target->variant.directoryVariant.children)) {
1143
1144                 T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n"));
1145
1146                 retVal = YAFFS_FAIL;
1147         } else {
1148
1149                 /* Now does unlinking internally using shadowing mechanism */
1150                 T(YAFFS_TRACE_OS, (KERN_DEBUG "calling yaffs_RenameObject\n"));
1151
1152                 retVal =
1153                     yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1154                                        old_dentry->d_name.name,
1155                                        yaffs_InodeToObject(new_dir),
1156                                        new_dentry->d_name.name);
1157
1158         }
1159         yaffs_GrossUnlock(dev);
1160
1161         if (retVal == YAFFS_OK) {
1162                 if(target) {
1163                         new_dentry->d_inode->i_nlink--;
1164                         mark_inode_dirty(new_dentry->d_inode);
1165                 }
1166
1167                 return 0;
1168         } else {
1169                 return -ENOTEMPTY;
1170         }
1171
1172 }
1173
1174 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1175 {
1176         struct inode *inode = dentry->d_inode;
1177         int error;
1178         yaffs_Device *dev;
1179
1180         T(YAFFS_TRACE_OS,
1181           (KERN_DEBUG "yaffs_setattr of object %d\n",
1182            yaffs_InodeToObject(inode)->objectId));
1183
1184         if ((error = inode_change_ok(inode, attr)) == 0) {
1185
1186                 dev = yaffs_InodeToObject(inode)->myDev;
1187                 yaffs_GrossLock(dev);
1188                 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1189                     YAFFS_OK) {
1190                         error = 0;
1191                 } else {
1192                         error = -EPERM;
1193                 }
1194                 yaffs_GrossUnlock(dev);
1195                 if (!error)
1196                         error = inode_setattr(inode, attr);
1197         }
1198         return error;
1199 }
1200
1201 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1202 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1203 #else
1204 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1205 #endif
1206 {
1207
1208         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1209         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_statfs\n"));
1210
1211         yaffs_GrossLock(dev);
1212
1213         buf->f_type = YAFFS_MAGIC;
1214         buf->f_bsize = sb->s_blocksize;
1215         buf->f_namelen = 255;
1216         if (sb->s_blocksize > dev->nBytesPerChunk) {
1217
1218                 buf->f_blocks =
1219                     (dev->endBlock - dev->startBlock +
1220                      1) * dev->nChunksPerBlock / (sb->s_blocksize /
1221                                                   dev->nBytesPerChunk);
1222                 buf->f_bfree =
1223                     yaffs_GetNumberOfFreeChunks(dev) / (sb->s_blocksize /
1224                                                         dev->nBytesPerChunk);
1225         } else {
1226
1227                 buf->f_blocks =
1228                     (dev->endBlock - dev->startBlock +
1229                      1) * dev->nChunksPerBlock * (dev->nBytesPerChunk /
1230                                                   sb->s_blocksize);
1231                 buf->f_bfree =
1232                     yaffs_GetNumberOfFreeChunks(dev) * (dev->nBytesPerChunk /
1233                                                         sb->s_blocksize);
1234         }
1235         buf->f_files = 0;
1236         buf->f_ffree = 0;
1237         buf->f_bavail = buf->f_bfree;
1238
1239         yaffs_GrossUnlock(dev);
1240         return 0;
1241 }
1242
1243 static void yaffs_read_inode(struct inode *inode)
1244 {
1245         /* NB This is called as a side effect of other functions, but
1246          * we had to release the lock to prevent deadlocks, so
1247          * need to lock again.
1248          */
1249
1250         yaffs_Object *obj;
1251         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1252
1253         T(YAFFS_TRACE_OS,
1254           (KERN_DEBUG "yaffs_read_inode for %d\n", (int)inode->i_ino));
1255
1256         yaffs_GrossLock(dev);
1257
1258         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1259
1260         yaffs_FillInodeFromObject(inode, obj);
1261
1262         yaffs_GrossUnlock(dev);
1263 }
1264
1265 static LIST_HEAD(yaffs_dev_list);
1266
1267 static void yaffs_put_super(struct super_block *sb)
1268 {
1269         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1270
1271         yaffs_GrossLock(dev);
1272         if (dev->putSuperFunc) {
1273                 dev->putSuperFunc(sb);
1274         }
1275         yaffs_Deinitialise(dev);
1276         yaffs_GrossUnlock(dev);
1277
1278         /* we assume this is protected by lock_kernel() in mount/umount */
1279         list_del(&dev->devList);
1280
1281         kfree(dev);
1282 }
1283
1284
1285 static void yaffs_MTDPutSuper(struct super_block *sb)
1286 {
1287
1288         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1289
1290         if (mtd->sync) {
1291                 mtd->sync(mtd);
1292         }
1293
1294         put_mtd_device(mtd);
1295 }
1296
1297
1298 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1299                                                      struct super_block *sb,
1300                                                      void *data, int silent)
1301 {
1302         int nBlocks;
1303         struct inode *inode = NULL;
1304         struct dentry *root;
1305         yaffs_Device *dev = 0;
1306         char devname_buf[BDEVNAME_SIZE + 1];
1307         struct mtd_info *mtd;
1308         int err;
1309
1310         sb->s_magic = YAFFS_MAGIC;
1311         sb->s_op = &yaffs_super_ops;
1312
1313         if (!sb)
1314                 printk(KERN_INFO "yaffs: sb is NULL\n");
1315         else if (!sb->s_dev)
1316                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1317         else if (!yaffs_devname(sb, devname_buf))
1318                 printk(KERN_INFO "yaffs: devname is NULL\n");
1319         else
1320                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1321                        sb->s_dev,
1322                        yaffs_devname(sb, devname_buf));
1323
1324         sb->s_blocksize = PAGE_CACHE_SIZE;
1325         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1326         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1327         T(YAFFS_TRACE_OS,
1328           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1329
1330 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1331         T(YAFFS_TRACE_OS,
1332           ("yaffs: Write verification disabled. All guarantees "
1333            "null and void\n"));
1334 #endif
1335
1336         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1337                                "\"%s\"\n",
1338                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
1339                                yaffs_devname(sb, devname_buf)));
1340
1341         /* Check it's an mtd device..... */
1342         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
1343                 return NULL;    /* This isn't an mtd device */
1344         }
1345         /* Get the device */
1346         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1347         if (!mtd) {
1348                 T(YAFFS_TRACE_ALWAYS,
1349                   ("yaffs: MTD device #%u doesn't appear to exist\n",
1350                    MINOR(sb->s_dev)));
1351                 return NULL;
1352         }
1353         /* Check it's NAND */
1354         if (mtd->type != MTD_NANDFLASH) {
1355                 T(YAFFS_TRACE_ALWAYS,
1356                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1357                 return NULL;
1358         }
1359
1360         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1361         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1362         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1363         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1364         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1365         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1366         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1367         T(YAFFS_TRACE_OS, (" oobblock %d\n", mtd->oobblock));
1368         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1369         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1370         T(YAFFS_TRACE_OS, (" size %d\n", mtd->size));
1371
1372 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1373
1374         if (yaffsVersion == 1 &&
1375             mtd->oobblock >= 2048) {
1376             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n"));
1377             yaffsVersion = 2;
1378         }
1379 #endif
1380
1381         if (yaffsVersion == 2) {
1382                 /* Check for version 2 style functions */
1383                 if (!mtd->erase ||
1384                     !mtd->block_isbad ||
1385                     !mtd->block_markbad ||
1386                     !mtd->read ||
1387                     !mtd->write ||
1388                     !mtd->write_ecc ||
1389                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1390                         T(YAFFS_TRACE_ALWAYS,
1391                           ("yaffs: MTD device does not support required "
1392                            "functions\n"));;
1393                         return NULL;
1394                 }
1395
1396                 if (mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1397                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) {
1398                         T(YAFFS_TRACE_ALWAYS,
1399                           ("yaffs: MTD device does not support have the "
1400                            "right page sizes\n"));
1401                         return NULL;
1402                 }
1403         } else {
1404                 /* Check for V1 style functions */
1405                 if (!mtd->erase ||
1406                     !mtd->read ||
1407                     !mtd->write ||
1408                     !mtd->write_ecc ||
1409                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1410                         T(YAFFS_TRACE_ALWAYS,
1411                           ("yaffs: MTD device does not support required "
1412                            "functions\n"));;
1413                         return NULL;
1414                 }
1415
1416                 if (mtd->oobblock != YAFFS_BYTES_PER_CHUNK ||
1417                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1418                         T(YAFFS_TRACE_ALWAYS,
1419                           ("yaffs: MTD device does not support have the "
1420                            "right page sizes\n"));
1421                         return NULL;
1422                 }
1423         }
1424
1425         /* OK, so if we got here, we have an MTD that's NAND and looks
1426          * like it has the right capabilities
1427          * Set the yaffs_Device up for mtd
1428          */
1429
1430 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1431         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1432 #else
1433         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1434 #endif
1435         if (!dev) {
1436                 /* Deep shit could not allocate device structure */
1437                 T(YAFFS_TRACE_ALWAYS,
1438                   ("yaffs_read_super: Failed trying to allocate "
1439                    "yaffs_Device. \n"));
1440                 return NULL;
1441         }
1442
1443         memset(dev, 0, sizeof(yaffs_Device));
1444         dev->genericDevice = mtd;
1445         dev->name = mtd->name;
1446
1447         /* Set up the memory size parameters.... */
1448
1449         nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1450         dev->startBlock = 0;
1451         dev->endBlock = nBlocks - 1;
1452         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1453         dev->nBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1454         dev->nReservedBlocks = 5;
1455         dev->nShortOpCaches = 10;       /* Enable short op caching */
1456
1457         /* ... and the functions. */
1458         if (yaffsVersion == 2) {
1459                 dev->writeChunkWithTagsToNAND =
1460                     nandmtd2_WriteChunkWithTagsToNAND;
1461                 dev->readChunkWithTagsFromNAND =
1462                     nandmtd2_ReadChunkWithTagsFromNAND;
1463                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1464                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1465                 dev->spareBuffer = YMALLOC(mtd->oobsize);
1466                 dev->isYaffs2 = 1;
1467                 dev->nBytesPerChunk = mtd->oobblock;
1468                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1469                 nBlocks = mtd->size / mtd->erasesize;
1470                 dev->startBlock = 0;
1471                 dev->endBlock = nBlocks - 1;
1472         } else {
1473                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1474                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1475                 dev->isYaffs2 = 0;
1476         }
1477         /* ... and common functions */
1478         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1479         dev->initialiseNAND = nandmtd_InitialiseNAND;
1480
1481         dev->putSuperFunc = yaffs_MTDPutSuper;
1482
1483 #ifndef CONFIG_YAFFS_DOES_ECC
1484         dev->useNANDECC = 1;
1485 #endif
1486
1487 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
1488         dev->wideTnodesDisabled = 1;
1489 #endif
1490
1491         /* we assume this is protected by lock_kernel() in mount/umount */
1492         list_add_tail(&dev->devList, &yaffs_dev_list);
1493
1494         init_MUTEX(&dev->grossLock);
1495
1496         yaffs_GrossLock(dev);
1497
1498         err = yaffs_GutsInitialise(dev);
1499
1500         T(YAFFS_TRACE_OS,
1501           ("yaffs_read_super: guts initialised %s\n",
1502            (err == YAFFS_OK) ? "OK" : "FAILED"));
1503
1504         /* Release lock before yaffs_get_inode() */
1505         yaffs_GrossUnlock(dev);
1506
1507         /* Create root inode */
1508         if (err == YAFFS_OK)
1509                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
1510                                         yaffs_Root(dev));
1511
1512         if (!inode)
1513                 return NULL;
1514
1515         inode->i_op = &yaffs_dir_inode_operations;
1516         inode->i_fop = &yaffs_dir_operations;
1517
1518         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
1519
1520         root = d_alloc_root(inode);
1521
1522         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
1523
1524         if (!root) {
1525                 iput(inode);
1526                 return NULL;
1527         }
1528         sb->s_root = root;
1529
1530         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
1531         return sb;
1532 }
1533
1534
1535 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1536 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
1537                                          int silent)
1538 {
1539         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
1540 }
1541
1542 static struct super_block *yaffs_read_super(struct file_system_type *fs,
1543                                             int flags, const char *dev_name,
1544                                             void *data)
1545 {
1546
1547         return get_sb_bdev(fs, flags, dev_name, data,
1548                            yaffs_internal_read_super_mtd);
1549 }
1550
1551 static struct file_system_type yaffs_fs_type = {
1552         .owner = THIS_MODULE,
1553         .name = "yaffs",
1554         .get_sb = yaffs_read_super,
1555         .kill_sb = kill_block_super,
1556         .fs_flags = FS_REQUIRES_DEV,
1557 };
1558 #else
1559 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
1560                                             int silent)
1561 {
1562         return yaffs_internal_read_super(1, sb, data, silent);
1563 }
1564
1565 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
1566                       FS_REQUIRES_DEV);
1567 #endif
1568
1569
1570 #ifdef CONFIG_YAFFS_YAFFS2
1571
1572 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1573 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
1574                                           int silent)
1575 {
1576         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
1577 }
1578
1579 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
1580                                              int flags, const char *dev_name,
1581                                              void *data)
1582 {
1583
1584         return get_sb_bdev(fs, flags, dev_name, data,
1585                            yaffs2_internal_read_super_mtd);
1586 }
1587
1588 static struct file_system_type yaffs2_fs_type = {
1589         .owner = THIS_MODULE,
1590         .name = "yaffs2",
1591         .get_sb = yaffs2_read_super,
1592         .kill_sb = kill_block_super,
1593         .fs_flags = FS_REQUIRES_DEV,
1594 };
1595 #else
1596 static struct super_block *yaffs2_read_super(struct super_block *sb,
1597                                              void *data, int silent)
1598 {
1599         return yaffs_internal_read_super(2, sb, data, silent);
1600 }
1601
1602 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
1603                       FS_REQUIRES_DEV);
1604 #endif
1605
1606 #endif                          /* CONFIG_YAFFS_YAFFS2 */
1607
1608 static struct proc_dir_entry *my_proc_entry;
1609
1610 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
1611 {
1612         buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
1613         buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
1614         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
1615         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
1616         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
1617         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
1618         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
1619         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
1620         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
1621         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
1622         buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
1623         buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
1624         buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
1625         buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
1626         buf +=
1627             sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
1628         buf +=
1629             sprintf(buf, "passiveGCs......... %d\n",
1630                     dev->passiveGarbageCollections);
1631         buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
1632         buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
1633         buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
1634         buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
1635         buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
1636         buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
1637         buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
1638         buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
1639         buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
1640         buf +=
1641             sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
1642         buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
1643         buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
1644
1645         return buf;
1646 }
1647
1648 static int yaffs_proc_read(char *page,
1649                            char **start,
1650                            off_t offset, int count, int *eof, void *data)
1651 {
1652         struct list_head *item;
1653         char *buf = page;
1654         int step = offset;
1655         int n = 0;
1656
1657         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
1658          * We use 'offset' (*ppos) to indicate where we are in devList.
1659          * This also assumes the user has posted a read buffer large
1660          * enough to hold the complete output; but that's life in /proc.
1661          */
1662
1663         *(int *)start = 1;
1664
1665         /* Print header first */
1666         if (step == 0) {
1667                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
1668                                "\n%s\n%s\n", yaffs_fs_c_version,
1669                                yaffs_guts_c_version);
1670         }
1671
1672         /* hold lock_kernel while traversing yaffs_dev_list */
1673         lock_kernel();
1674
1675         /* Locate and print the Nth entry.  Order N-squared but N is small. */
1676         list_for_each(item, &yaffs_dev_list) {
1677                 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
1678                 if (n < step) {
1679                         n++;
1680                         continue;
1681                 }
1682                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
1683                 buf = yaffs_dump_dev(buf, dev);
1684                 break;
1685         }
1686         unlock_kernel();
1687
1688         return buf - page < count ? buf - page : count;
1689 }
1690
1691 /* Stuff to handle installation of file systems */
1692 struct file_system_to_install {
1693         struct file_system_type *fst;
1694         int installed;
1695 };
1696
1697 static struct file_system_to_install fs_to_install[] = {
1698 //#ifdef CONFIG_YAFFS_YAFFS1
1699         {&yaffs_fs_type, 0},
1700 //#endif
1701 //#ifdef CONFIG_YAFFS_YAFFS2
1702         {&yaffs2_fs_type, 0},
1703 //#endif
1704         {NULL, 0}
1705 };
1706
1707 static int __init init_yaffs_fs(void)
1708 {
1709         int error = 0;
1710         struct file_system_to_install *fsinst;
1711
1712         T(YAFFS_TRACE_ALWAYS,
1713           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
1714
1715         /* Install the proc_fs entry */
1716         my_proc_entry = create_proc_read_entry("yaffs",
1717                                                S_IRUGO | S_IFREG,
1718                                                &proc_root,
1719                                                yaffs_proc_read, NULL);
1720         if (!my_proc_entry) {
1721                 return -ENOMEM;
1722         }
1723
1724         /* Now add the file system entries */
1725
1726         fsinst = fs_to_install;
1727
1728         while (fsinst->fst && !error) {
1729                 error = register_filesystem(fsinst->fst);
1730                 if (!error) {
1731                         fsinst->installed = 1;
1732                 }
1733                 fsinst++;
1734         }
1735
1736         /* Any errors? uninstall  */
1737         if (error) {
1738                 fsinst = fs_to_install;
1739
1740                 while (fsinst->fst) {
1741                         if (fsinst->installed) {
1742                                 unregister_filesystem(fsinst->fst);
1743                                 fsinst->installed = 0;
1744                         }
1745                         fsinst++;
1746                 }
1747         }
1748
1749         return error;
1750 }
1751
1752 static void __exit exit_yaffs_fs(void)
1753 {
1754
1755         struct file_system_to_install *fsinst;
1756
1757         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
1758                                " removing. \n"));
1759
1760         remove_proc_entry("yaffs", &proc_root);
1761
1762         fsinst = fs_to_install;
1763
1764         while (fsinst->fst) {
1765                 if (fsinst->installed) {
1766                         unregister_filesystem(fsinst->fst);
1767                         fsinst->installed = 0;
1768                 }
1769                 fsinst++;
1770         }
1771
1772 }
1773
1774 module_init(init_yaffs_fs)
1775 module_exit(exit_yaffs_fs)
1776
1777 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
1778 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002,2003,2004");
1779 MODULE_LICENSE("GPL");