yaffs_fs.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  * Acknowledgements:
   9  * Luc van OostenRyck for numerous patches.
  10  * Nick Bane for numerous patches.
  11  * Nick Bane for 2.5/2.6 integration.
  12  * Andras Toth for mknod rdev issue.
  13  * Michael Fischer for finding the problem with inode inconsistency.
  14  * Some code bodily lifted from JFFS
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 /*
  22  *
  23  * This is the file system front-end to YAFFS that hooks it up to
  24  * the VFS.
  25  *
  26  * Special notes:
  27  * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
  28  *         this superblock
  29  * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this
  30  *         superblock
  31  * >> inode->u.generic_ip points to the associated yaffs_Object.
  32  */
  33
  34 const char *yaffs_fs_c_version =
  35     "$Id: yaffs_fs.c,v 1.60 2007-05-15 20:07:40 charles Exp $";
  36 extern const char *yaffs_guts_c_version;
  37
  38 #include <linux/version.h>
  39 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
  40 #include <linux/config.h>
  41 #endif
  42 #include <linux/kernel.h>
  43 #include <linux/module.h>
  44 #include <linux/slab.h>
  45 #include <linux/init.h>
  46 #include <linux/list.h>
  47 #include <linux/fs.h>
  48 #include <linux/proc_fs.h>
  49 #include <linux/smp_lock.h>
  50 #include <linux/pagemap.h>
  51 #include <linux/mtd/mtd.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/string.h>
  54 #include <linux/ctype.h>
  55
  56 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  57
  58 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  59 #include <asm/statfs.h>
  60 #define UnlockPage(p) unlock_page(p)
  61 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  62
  63 /* FIXME: use sb->s_id instead ? */
  64 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)
  65
  66 #else
  67
  68 #include <linux/locks.h>
  69 #define BDEVNAME_SIZE           0
  70 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
  71
  72 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  73 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
  74 #define __user
  75 #endif
  76
  77 #endif
  78
  79 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  80 #define WRITE_SIZE_STR "writesize"
  81 #define WRITE_SIZE(mtd) (mtd)->writesize
  82 #else
  83 #define WRITE_SIZE_STR "oobblock"
  84 #define WRITE_SIZE(mtd) (mtd)->oobblock
  85 #endif
  86
  87 #include <asm/uaccess.h>
  88
  89 #include "yportenv.h"
  90 #include "yaffs_guts.h"
  91
  92 unsigned yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS
  93                            /* | 0xFFFFFFFF */;
  94
  95 #include <linux/mtd/mtd.h>
  96 #include "yaffs_mtdif.h"
  97 #include "yaffs_mtdif2.h"
  98
  99 /*#define T(x) printk x */
 100
 101 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 102 #define yaffs_InodeToObjectLV(iptr) (iptr)->i_private
 103 #else
 104 #define yaffs_InodeToObjectLV(iptr) (iptr)->u.generic_ip
 105 #endif
 106
 107 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
 108 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
 109
 110 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 111 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
 112 #else
 113 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 114 #endif
 115
 116 static void yaffs_put_super(struct super_block *sb);
 117
 118 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 119                                 loff_t * pos);
 120
 121 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 122 static int yaffs_file_flush(struct file *file, fl_owner_t id);
 123 #else
 124 static int yaffs_file_flush(struct file *file);
 125 #endif
 126
 127 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 128                              int datasync);
 129
 130 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 131
 132 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 133 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 134                         struct nameidata *n);
 135 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 136                                    struct nameidata *n);
 137 #else
 138 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 139 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 140 #endif
 141 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 142                       struct dentry *dentry);
 143 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 144 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 145                          const char *symname);
 146 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 147
 148 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 149 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 150                        dev_t dev);
 151 #else
 152 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 153                        int dev);
 154 #endif
 155 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 156                         struct inode *new_dir, struct dentry *new_dentry);
 157 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 158
 159 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 160 static int yaffs_sync_fs(struct super_block *sb, int wait);
 161 static void yaffs_write_super(struct super_block *sb);
 162 #else
 163 static int yaffs_sync_fs(struct super_block *sb);
 164 static int yaffs_write_super(struct super_block *sb);
 165 #endif
 166
 167 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 168 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
 169 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 170 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 171 #else
 172 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 173 #endif
 174 static void yaffs_read_inode(struct inode *inode);
 175
 176 static void yaffs_put_inode(struct inode *inode);
 177 static void yaffs_delete_inode(struct inode *);
 178 static void yaffs_clear_inode(struct inode *);
 179
 180 static int yaffs_readpage(struct file *file, struct page *page);
 181 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 182 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 183 #else
 184 static int yaffs_writepage(struct page *page);
 185 #endif
 186 static int yaffs_prepare_write(struct file *f, struct page *pg,
 187                                unsigned offset, unsigned to);
 188 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 189                               unsigned to);
 190
 191 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 192                           int buflen);
 193 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 194 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 195 #else
 196 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 197 #endif
 198
 199 static struct address_space_operations yaffs_file_address_operations = {
 200         .readpage = yaffs_readpage,
 201         .writepage = yaffs_writepage,
 202         .prepare_write = yaffs_prepare_write,
 203         .commit_write = yaffs_commit_write,
 204 };
 205
 206 static struct file_operations yaffs_file_operations = {
 207 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 208         .read = do_sync_read,
 209         .write = do_sync_write,
 210         .aio_read = generic_file_aio_read,
 211         .aio_write = generic_file_aio_write,
 212 #else
 213         .read = generic_file_read,
 214         .write = generic_file_write,
 215 #endif
 216         .mmap = generic_file_mmap,
 217         .flush = yaffs_file_flush,
 218         .fsync = yaffs_sync_object,
 219 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 220         .sendfile = generic_file_sendfile,
 221 #endif
 222
 223 };
 224
 225 static struct inode_operations yaffs_file_inode_operations = {
 226         .setattr = yaffs_setattr,
 227 };
 228
 229 static struct inode_operations yaffs_symlink_inode_operations = {
 230         .readlink = yaffs_readlink,
 231         .follow_link = yaffs_follow_link,
 232         .setattr = yaffs_setattr,
 233 };
 234
 235 static struct inode_operations yaffs_dir_inode_operations = {
 236         .create = yaffs_create,
 237         .lookup = yaffs_lookup,
 238         .link = yaffs_link,
 239         .unlink = yaffs_unlink,
 240         .symlink = yaffs_symlink,
 241         .mkdir = yaffs_mkdir,
 242         .rmdir = yaffs_unlink,
 243         .mknod = yaffs_mknod,
 244         .rename = yaffs_rename,
 245         .setattr = yaffs_setattr,
 246 };
 247
 248 static struct file_operations yaffs_dir_operations = {
 249         .read = generic_read_dir,
 250         .readdir = yaffs_readdir,
 251         .fsync = yaffs_sync_object,
 252 };
 253
 254 static struct super_operations yaffs_super_ops = {
 255         .statfs = yaffs_statfs,
 256         .read_inode = yaffs_read_inode,
 257         .put_inode = yaffs_put_inode,
 258         .put_super = yaffs_put_super,
 259         .delete_inode = yaffs_delete_inode,
 260         .clear_inode = yaffs_clear_inode,
 261         .sync_fs = yaffs_sync_fs,
 262         .write_super = yaffs_write_super,
 263 };
 264
 265 static void yaffs_GrossLock(yaffs_Device * dev)
 266 {
 267         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs locking\n"));
 268
 269         down(&dev->grossLock);
 270 }
 271
 272 static void yaffs_GrossUnlock(yaffs_Device * dev)
 273 {
 274         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs unlocking\n"));
 275         up(&dev->grossLock);
 276
 277 }
 278
 279 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 280                           int buflen)
 281 {
 282         unsigned char *alias;
 283         int ret;
 284
 285         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 286
 287         yaffs_GrossLock(dev);
 288
 289         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 290
 291         yaffs_GrossUnlock(dev);
 292
 293         if (!alias)
 294                 return -ENOMEM;
 295
 296         ret = vfs_readlink(dentry, buffer, buflen, alias);
 297         kfree(alias);
 298         return ret;
 299 }
 300
 301 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 302 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 303 #else
 304 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 305 #endif
 306 {
 307         unsigned char *alias;
 308         int ret;
 309         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 310
 311         yaffs_GrossLock(dev);
 312
 313         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 314
 315         yaffs_GrossUnlock(dev);
 316
 317         if (!alias)
 318         {
 319                 ret = -ENOMEM;
 320                 goto out;
 321         }
 322
 323         ret = vfs_follow_link(nd, alias);
 324         kfree(alias);
 325 out:
 326 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 327         return ERR_PTR (ret);
 328 #else
 329         return ret;
 330 #endif
 331 }
 332
 333 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 334                               yaffs_Object * obj);
 335
 336 /*
 337  * Lookup is used to find objects in the fs
 338  */
 339 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 340
 341 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 342                                    struct nameidata *n)
 343 #else
 344 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 345 #endif
 346 {
 347         yaffs_Object *obj;
 348         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 349
 350         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 351
 352         yaffs_GrossLock(dev);
 353
 354         T(YAFFS_TRACE_OS,
 355           (KERN_DEBUG "yaffs_lookup for %d:%s\n",
 356            yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 357
 358         obj =
 359             yaffs_FindObjectByName(yaffs_InodeToObject(dir),
 360                                    dentry->d_name.name);
 361
 362         obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
 363
 364         /* Can't hold gross lock when calling yaffs_get_inode() */
 365         yaffs_GrossUnlock(dev);
 366
 367         if (obj) {
 368                 T(YAFFS_TRACE_OS,
 369                   (KERN_DEBUG "yaffs_lookup found %d\n", obj->objectId));
 370
 371                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 372
 373                 if (inode) {
 374                         T(YAFFS_TRACE_OS,
 375                           (KERN_DEBUG "yaffs_loookup dentry \n"));
 376 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 377  * d_add even if NULL inode */
 378 #if 0
 379                         /*dget(dentry); // try to solve directory bug */
 380                         d_add(dentry, inode);
 381
 382                         /* return dentry; */
 383                         return NULL;
 384 #endif
 385                 }
 386
 387         } else {
 388                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_lookup not found\n"));
 389
 390         }
 391
 392 /* added NCB for 2.5/6 compatability - forces add even if inode is
 393  * NULL which creates dentry hash */
 394         d_add(dentry, inode);
 395
 396         return NULL;
 397         /*      return (ERR_PTR(-EIO)); */
 398
 399 }
 400
 401 /* For now put inode is just for debugging
 402  * Put inode is called when the inode **structure** is put.
 403  */
 404 static void yaffs_put_inode(struct inode *inode)
 405 {
 406         T(YAFFS_TRACE_OS,
 407           ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 408            atomic_read(&inode->i_count)));
 409
 410 }
 411
 412 /* clear is called to tell the fs to release any per-inode data it holds */
 413 static void yaffs_clear_inode(struct inode *inode)
 414 {
 415         yaffs_Object *obj;
 416         yaffs_Device *dev;
 417
 418         obj = yaffs_InodeToObject(inode);
 419
 420         T(YAFFS_TRACE_OS,
 421           ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 422            atomic_read(&inode->i_count),
 423            obj ? "object exists" : "null object"));
 424
 425         if (obj) {
 426                 dev = obj->myDev;
 427                 yaffs_GrossLock(dev);
 428
 429                 /* Clear the association between the inode and
 430                  * the yaffs_Object.
 431                  */
 432                 obj->myInode = NULL;
 433                 yaffs_InodeToObjectLV(inode) = NULL;
 434
 435                 /* If the object freeing was deferred, then the real
 436                  * free happens now.
 437                  * This should fix the inode inconsistency problem.
 438                  */
 439
 440                 yaffs_HandleDeferedFree(obj);
 441
 442                 yaffs_GrossUnlock(dev);
 443         }
 444
 445 }
 446
 447 /* delete is called when the link count is zero and the inode
 448  * is put (ie. nobody wants to know about it anymore, time to
 449  * delete the file).
 450  * NB Must call clear_inode()
 451  */
 452 static void yaffs_delete_inode(struct inode *inode)
 453 {
 454         yaffs_Object *obj = yaffs_InodeToObject(inode);
 455         yaffs_Device *dev;
 456
 457         T(YAFFS_TRACE_OS,
 458           ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 459            atomic_read(&inode->i_count),
 460            obj ? "object exists" : "null object"));
 461
 462         if (obj) {
 463                 dev = obj->myDev;
 464                 yaffs_GrossLock(dev);
 465                 yaffs_DeleteFile(obj);
 466                 yaffs_GrossUnlock(dev);
 467         }
 468 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 469         truncate_inode_pages (&inode->i_data, 0);
 470 #endif
 471         clear_inode(inode);
 472 }
 473
 474 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 475 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 476 #else
 477 static int yaffs_file_flush(struct file *file)
 478 #endif
 479 {
 480         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 481
 482         yaffs_Device *dev = obj->myDev;
 483
 484         T(YAFFS_TRACE_OS,
 485           (KERN_DEBUG "yaffs_file_flush object %d (%s)\n", obj->objectId,
 486            obj->dirty ? "dirty" : "clean"));
 487
 488         yaffs_GrossLock(dev);
 489
 490         yaffs_FlushFile(obj, 1);
 491
 492         yaffs_GrossUnlock(dev);
 493
 494         return 0;
 495 }
 496
 497 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 498 {
 499         /* Lifted from jffs2 */
 500
 501         yaffs_Object *obj;
 502         unsigned char *pg_buf;
 503         int ret;
 504
 505         yaffs_Device *dev;
 506
 507         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage at %08x, size %08x\n",
 508                            (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 509                            (unsigned)PAGE_CACHE_SIZE));
 510
 511         obj = yaffs_DentryToObject(f->f_dentry);
 512
 513         dev = obj->myDev;
 514
 515 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 516         BUG_ON(!PageLocked(pg));
 517 #else
 518         if (!PageLocked(pg))
 519                 PAGE_BUG(pg);
 520 #endif
 521
 522         pg_buf = kmap(pg);
 523         /* FIXME: Can kmap fail? */
 524
 525         yaffs_GrossLock(dev);
 526
 527         ret =
 528             yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT,
 529                                    PAGE_CACHE_SIZE);
 530
 531         yaffs_GrossUnlock(dev);
 532
 533         if (ret >= 0)
 534                 ret = 0;
 535
 536         if (ret) {
 537                 ClearPageUptodate(pg);
 538                 SetPageError(pg);
 539         } else {
 540                 SetPageUptodate(pg);
 541                 ClearPageError(pg);
 542         }
 543
 544         flush_dcache_page(pg);
 545         kunmap(pg);
 546
 547         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage done\n"));
 548         return ret;
 549 }
 550
 551 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 552 {
 553         int ret = yaffs_readpage_nolock(f, pg);
 554         UnlockPage(pg);
 555         return ret;
 556 }
 557
 558 static int yaffs_readpage(struct file *f, struct page *pg)
 559 {
 560         return yaffs_readpage_unlock(f, pg);
 561 }
 562
 563 /* writepage inspired by/stolen from smbfs */
 564
 565 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 566 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 567 #else
 568 static int yaffs_writepage(struct page *page)
 569 #endif
 570 {
 571         struct address_space *mapping = page->mapping;
 572         loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
 573         struct inode *inode;
 574         unsigned long end_index;
 575         char *buffer;
 576         yaffs_Object *obj;
 577         int nWritten = 0;
 578         unsigned nBytes;
 579
 580         if (!mapping)
 581                 BUG();
 582         inode = mapping->host;
 583         if (!inode)
 584                 BUG();
 585
 586         if (offset > inode->i_size) {
 587                 T(YAFFS_TRACE_OS,
 588                   (KERN_DEBUG
 589                    "yaffs_writepage at %08x, inode size = %08x!!!\n",
 590                    (unsigned)(page->index << PAGE_CACHE_SHIFT),
 591                    (unsigned)inode->i_size));
 592                 T(YAFFS_TRACE_OS,
 593                   (KERN_DEBUG "                -> don't care!!\n"));
 594                 unlock_page(page);
 595                 return 0;
 596         }
 597
 598         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 599
 600         /* easy case */
 601         if (page->index < end_index) {
 602                 nBytes = PAGE_CACHE_SIZE;
 603         } else {
 604                 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
 605         }
 606
 607         get_page(page);
 608
 609         buffer = kmap(page);
 610
 611         obj = yaffs_InodeToObject(inode);
 612         yaffs_GrossLock(obj->myDev);
 613
 614         T(YAFFS_TRACE_OS,
 615           (KERN_DEBUG "yaffs_writepage at %08x, size %08x\n",
 616            (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 617         T(YAFFS_TRACE_OS,
 618           (KERN_DEBUG "writepag0: obj = %05x, ino = %05x\n",
 619            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 620
 621         nWritten =
 622             yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT,
 623                                   nBytes, 0);
 624
 625         T(YAFFS_TRACE_OS,
 626           (KERN_DEBUG "writepag1: obj = %05x, ino = %05x\n",
 627            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 628
 629         yaffs_GrossUnlock(obj->myDev);
 630
 631         kunmap(page);
 632         SetPageUptodate(page);
 633         UnlockPage(page);
 634         put_page(page);
 635
 636         return (nWritten == nBytes) ? 0 : -ENOSPC;
 637 }
 638
 639 static int yaffs_prepare_write(struct file *f, struct page *pg,
 640                                unsigned offset, unsigned to)
 641 {
 642
 643         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
 644         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 645                 return yaffs_readpage_nolock(f, pg);
 646
 647         return 0;
 648
 649 }
 650
 651 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 652                               unsigned to)
 653 {
 654
 655         void *addr = page_address(pg) + offset;
 656         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
 657         int nBytes = to - offset;
 658         int nWritten;
 659
 660         unsigned spos = pos;
 661         unsigned saddr = (unsigned)addr;
 662
 663         T(YAFFS_TRACE_OS,
 664           (KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
 665            spos, nBytes));
 666
 667         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
 668
 669         if (nWritten != nBytes) {
 670                 T(YAFFS_TRACE_OS,
 671                   (KERN_DEBUG
 672                    "yaffs_commit_write not same size nWritten %d  nBytes %d\n",
 673                    nWritten, nBytes));
 674                 SetPageError(pg);
 675                 ClearPageUptodate(pg);
 676         } else {
 677                 SetPageUptodate(pg);
 678         }
 679
 680         T(YAFFS_TRACE_OS,
 681           (KERN_DEBUG "yaffs_commit_write returning %d\n",
 682            nWritten == nBytes ? 0 : nWritten));
 683
 684         return nWritten == nBytes ? 0 : nWritten;
 685
 686 }
 687
 688 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
 689 {
 690         if (inode && obj) {
 691
 692
 693                 /* Check mode against the variant type and attempt to repair if broken. */
 694                 __u32 mode = obj->yst_mode;
 695                 switch( obj->variantType ){
 696                 case YAFFS_OBJECT_TYPE_FILE :
 697                         if( ! S_ISREG(mode) ){
 698                                 obj->yst_mode &= ~S_IFMT;
 699                                 obj->yst_mode |= S_IFREG;
 700                         }
 701
 702                         break;
 703                 case YAFFS_OBJECT_TYPE_SYMLINK :
 704                         if( ! S_ISLNK(mode) ){
 705                                 obj->yst_mode &= ~S_IFMT;
 706                                 obj->yst_mode |= S_IFLNK;
 707                         }
 708
 709                         break;
 710                 case YAFFS_OBJECT_TYPE_DIRECTORY :
 711                         if( ! S_ISDIR(mode) ){
 712                                 obj->yst_mode &= ~S_IFMT;
 713                                 obj->yst_mode |= S_IFDIR;
 714                         }
 715
 716                         break;
 717                 case YAFFS_OBJECT_TYPE_UNKNOWN :
 718                 case YAFFS_OBJECT_TYPE_HARDLINK :
 719                 case YAFFS_OBJECT_TYPE_SPECIAL :
 720                 default:
 721                         /* TODO? */
 722                         break;
 723                 }
 724
 725                 inode->i_ino = obj->objectId;
 726                 inode->i_mode = obj->yst_mode;
 727                 inode->i_uid = obj->yst_uid;
 728                 inode->i_gid = obj->yst_gid;
 729 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
 730                 inode->i_blksize = inode->i_sb->s_blocksize;
 731 #endif
 732 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 733
 734                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 735                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
 736                 inode->i_atime.tv_nsec = 0;
 737                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
 738                 inode->i_mtime.tv_nsec = 0;
 739                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
 740                 inode->i_ctime.tv_nsec = 0;
 741 #else
 742                 inode->i_rdev = obj->yst_rdev;
 743                 inode->i_atime = obj->yst_atime;
 744                 inode->i_mtime = obj->yst_mtime;
 745                 inode->i_ctime = obj->yst_ctime;
 746 #endif
 747                 inode->i_size = yaffs_GetObjectFileLength(obj);
 748                 inode->i_blocks = (inode->i_size + 511) >> 9;
 749
 750                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 751
 752                 T(YAFFS_TRACE_OS,
 753                   (KERN_DEBUG
 754                    "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 755                    inode->i_mode, inode->i_uid, inode->i_gid,
 756                    (int)inode->i_size, atomic_read(&inode->i_count)));
 757
 758                 switch (obj->yst_mode & S_IFMT) {
 759                 default:        /* fifo, device or socket */
 760 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 761                         init_special_inode(inode, obj->yst_mode,
 762                                            old_decode_dev(obj->yst_rdev));
 763 #else
 764                         init_special_inode(inode, obj->yst_mode,
 765                                            (dev_t) (obj->yst_rdev));
 766 #endif
 767                         break;
 768                 case S_IFREG:   /* file */
 769                         inode->i_op = &yaffs_file_inode_operations;
 770                         inode->i_fop = &yaffs_file_operations;
 771                         inode->i_mapping->a_ops =
 772                             &yaffs_file_address_operations;
 773                         break;
 774                 case S_IFDIR:   /* directory */
 775                         inode->i_op = &yaffs_dir_inode_operations;
 776                         inode->i_fop = &yaffs_dir_operations;
 777                         break;
 778                 case S_IFLNK:   /* symlink */
 779                         inode->i_op = &yaffs_symlink_inode_operations;
 780                         break;
 781                 }
 782
 783                 yaffs_InodeToObjectLV(inode) = obj;
 784
 785                 obj->myInode = inode;
 786
 787         } else {
 788                 T(YAFFS_TRACE_OS,
 789                   (KERN_DEBUG "yaffs_FileInode invalid parameters\n"));
 790         }
 791
 792 }
 793
 794 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 795                               yaffs_Object * obj)
 796 {
 797         struct inode *inode;
 798
 799         if (!sb) {
 800                 T(YAFFS_TRACE_OS,
 801                   (KERN_DEBUG "yaffs_get_inode for NULL super_block!!\n"));
 802                 return NULL;
 803
 804         }
 805
 806         if (!obj) {
 807                 T(YAFFS_TRACE_OS,
 808                   (KERN_DEBUG "yaffs_get_inode for NULL object!!\n"));
 809                 return NULL;
 810
 811         }
 812
 813         T(YAFFS_TRACE_OS,
 814           (KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId));
 815
 816         inode = iget(sb, obj->objectId);
 817
 818         /* NB Side effect: iget calls back to yaffs_read_inode(). */
 819         /* iget also increments the inode's i_count */
 820         /* NB You can't be holding grossLock or deadlock will happen! */
 821
 822         return inode;
 823 }
 824
 825 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 826                                 loff_t * pos)
 827 {
 828         yaffs_Object *obj;
 829         int nWritten, ipos;
 830         struct inode *inode;
 831         yaffs_Device *dev;
 832
 833         obj = yaffs_DentryToObject(f->f_dentry);
 834
 835         dev = obj->myDev;
 836
 837         yaffs_GrossLock(dev);
 838
 839         inode = f->f_dentry->d_inode;
 840
 841         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) {
 842                 ipos = inode->i_size;
 843         } else {
 844                 ipos = *pos;
 845         }
 846
 847         if (!obj) {
 848                 T(YAFFS_TRACE_OS,
 849                   (KERN_DEBUG "yaffs_file_write: hey obj is null!\n"));
 850         } else {
 851                 T(YAFFS_TRACE_OS,
 852                   (KERN_DEBUG
 853                    "yaffs_file_write about to write writing %d bytes"
 854                    "to object %d at %d\n",
 855                    n, obj->objectId, ipos));
 856         }
 857
 858         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
 859
 860         T(YAFFS_TRACE_OS,
 861           (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n",
 862            n, nWritten, ipos));
 863         if (nWritten > 0) {
 864                 ipos += nWritten;
 865                 *pos = ipos;
 866                 if (ipos > inode->i_size) {
 867                         inode->i_size = ipos;
 868                         inode->i_blocks = (ipos + 511) >> 9;
 869
 870                         T(YAFFS_TRACE_OS,
 871                           (KERN_DEBUG
 872                            "yaffs_file_write size updated to %d bytes, "
 873                            "%d blocks\n",
 874                            ipos, (int)(inode->i_blocks)));
 875                 }
 876
 877         }
 878         yaffs_GrossUnlock(dev);
 879         return nWritten == 0 ? -ENOSPC : nWritten;
 880 }
 881
 882 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 883 {
 884         yaffs_Object *obj;
 885         yaffs_Device *dev;
 886         struct inode *inode = f->f_dentry->d_inode;
 887         unsigned long offset, curoffs;
 888         struct list_head *i;
 889         yaffs_Object *l;
 890
 891         char name[YAFFS_MAX_NAME_LENGTH + 1];
 892
 893         obj = yaffs_DentryToObject(f->f_dentry);
 894         dev = obj->myDev;
 895
 896         yaffs_GrossLock(dev);
 897
 898         offset = f->f_pos;
 899
 900         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
 901
 902         if (offset == 0) {
 903                 T(YAFFS_TRACE_OS,
 904                   (KERN_DEBUG "yaffs_readdir: entry . ino %d \n",
 905                    (int)inode->i_ino));
 906                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR)
 907                     < 0) {
 908                         goto out;
 909                 }
 910                 offset++;
 911                 f->f_pos++;
 912         }
 913         if (offset == 1) {
 914                 T(YAFFS_TRACE_OS,
 915                   (KERN_DEBUG "yaffs_readdir: entry .. ino %d \n",
 916                    (int)f->f_dentry->d_parent->d_inode->i_ino));
 917                 if (filldir
 918                     (dirent, "..", 2, offset,
 919                      f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 920                         goto out;
 921                 }
 922                 offset++;
 923                 f->f_pos++;
 924         }
 925
 926         curoffs = 1;
 927
 928         /* If the directory has changed since the open or last call to
 929            readdir, rewind to after the 2 canned entries. */
 930
 931         if (f->f_version != inode->i_version) {
 932                 offset = 2;
 933                 f->f_pos = offset;
 934                 f->f_version = inode->i_version;
 935         }
 936
 937         list_for_each(i, &obj->variant.directoryVariant.children) {
 938                 curoffs++;
 939                 if (curoffs >= offset) {
 940                         l = list_entry(i, yaffs_Object, siblings);
 941
 942                         yaffs_GetObjectName(l, name,
 943                                             YAFFS_MAX_NAME_LENGTH + 1);
 944                         T(YAFFS_TRACE_OS,
 945                           (KERN_DEBUG "yaffs_readdir: %s inode %d\n", name,
 946                            yaffs_GetObjectInode(l)));
 947
 948                         if (filldir(dirent,
 949                                     name,
 950                                     strlen(name),
 951                                     offset,
 952                                     yaffs_GetObjectInode(l),
 953                                     yaffs_GetObjectType(l))
 954                             < 0) {
 955                                 goto up_and_out;
 956                         }
 957
 958                         offset++;
 959                         f->f_pos++;
 960                 }
 961         }
 962
 963       up_and_out:
 964       out:
 965
 966         yaffs_GrossUnlock(dev);
 967
 968         return 0;
 969 }
 970
 971 /*
 972  * File creation. Allocate an inode, and we're done..
 973  */
 974 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 975 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 976                        dev_t rdev)
 977 #else
 978 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 979                        int rdev)
 980 #endif
 981 {
 982         struct inode *inode;
 983
 984         yaffs_Object *obj = NULL;
 985         yaffs_Device *dev;
 986
 987         yaffs_Object *parent = yaffs_InodeToObject(dir);
 988
 989         int error = -ENOSPC;
 990         uid_t uid = current->fsuid;
 991         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
 992
 993         if((dir->i_mode & S_ISGID) && S_ISDIR(mode))
 994                 mode |= S_ISGID;
 995
 996         if (parent) {
 997                 T(YAFFS_TRACE_OS,
 998                   (KERN_DEBUG "yaffs_mknod: parent object %d type %d\n",
 999                    parent->objectId, parent->variantType));
1000         } else {
1001                 T(YAFFS_TRACE_OS,
1002                   (KERN_DEBUG "yaffs_mknod: could not get parent object\n"));
1003                 return -EPERM;
1004         }
1005
1006         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1007                            "mode %x dev %x\n",
1008                            dentry->d_name.name, mode, rdev));
1009
1010         dev = parent->myDev;
1011
1012         yaffs_GrossLock(dev);
1013
1014         switch (mode & S_IFMT) {
1015         default:
1016                 /* Special (socket, fifo, device...) */
1017                 T(YAFFS_TRACE_OS, (KERN_DEBUG
1018                                    "yaffs_mknod: making special\n"));
1019 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1020                 obj =
1021                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1022                                        gid, old_encode_dev(rdev));
1023 #else
1024                 obj =
1025                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1026                                        gid, rdev);
1027 #endif
1028                 break;
1029         case S_IFREG:           /* file          */
1030                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1031                 obj =
1032                     yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1033                                     gid);
1034                 break;
1035         case S_IFDIR:           /* directory */
1036                 T(YAFFS_TRACE_OS,
1037                   (KERN_DEBUG "yaffs_mknod: making directory\n"));
1038                 obj =
1039                     yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1040                                          uid, gid);
1041                 break;
1042         case S_IFLNK:           /* symlink */
1043                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1044                 obj = NULL;     /* Do we ever get here? */
1045                 break;
1046         }
1047
1048         /* Can not call yaffs_get_inode() with gross lock held */
1049         yaffs_GrossUnlock(dev);
1050
1051         if (obj) {
1052                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1053                 d_instantiate(dentry, inode);
1054                 T(YAFFS_TRACE_OS,
1055                   (KERN_DEBUG "yaffs_mknod created object %d count = %d\n",
1056                    obj->objectId, atomic_read(&inode->i_count)));
1057                 error = 0;
1058         } else {
1059                 T(YAFFS_TRACE_OS,
1060                   (KERN_DEBUG "yaffs_mknod failed making object\n"));
1061                 error = -ENOMEM;
1062         }
1063
1064         return error;
1065 }
1066
1067 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1068 {
1069         int retVal;
1070         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mkdir\n"));
1071         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1072 #if 0
1073         /* attempt to fix dir bug - didn't work */
1074         if (!retVal) {
1075                 dget(dentry);
1076         }
1077 #endif
1078         return retVal;
1079 }
1080
1081 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1082 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1083                         struct nameidata *n)
1084 #else
1085 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1086 #endif
1087 {
1088         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_create\n"));
1089         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1090 }
1091
1092 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1093 {
1094         int retVal;
1095
1096         yaffs_Device *dev;
1097
1098         T(YAFFS_TRACE_OS,
1099           (KERN_DEBUG "yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1100            dentry->d_name.name));
1101
1102         dev = yaffs_InodeToObject(dir)->myDev;
1103
1104         yaffs_GrossLock(dev);
1105
1106         retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1107
1108         if (retVal == YAFFS_OK) {
1109                 dentry->d_inode->i_nlink--;
1110                 dir->i_version++;
1111                 yaffs_GrossUnlock(dev);
1112                 mark_inode_dirty(dentry->d_inode);
1113                 return 0;
1114         }
1115         yaffs_GrossUnlock(dev);
1116         return -ENOTEMPTY;
1117 }
1118
1119 /*
1120  * Create a link...
1121  */
1122 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1123                       struct dentry *dentry)
1124 {
1125         struct inode *inode = old_dentry->d_inode;
1126         yaffs_Object *obj = NULL;
1127         yaffs_Object *link = NULL;
1128         yaffs_Device *dev;
1129
1130         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_link\n"));
1131
1132         obj = yaffs_InodeToObject(inode);
1133         dev = obj->myDev;
1134
1135         yaffs_GrossLock(dev);
1136
1137         if (!S_ISDIR(inode->i_mode))    /* Don't link directories */
1138         {
1139                 link =
1140                     yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1141                                obj);
1142         }
1143
1144         if (link) {
1145                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1146                 d_instantiate(dentry, old_dentry->d_inode);
1147                 atomic_inc(&old_dentry->d_inode->i_count);
1148                 T(YAFFS_TRACE_OS,
1149                   (KERN_DEBUG "yaffs_link link count %d i_count %d\n",
1150                    old_dentry->d_inode->i_nlink,
1151                    atomic_read(&old_dentry->d_inode->i_count)));
1152
1153         }
1154
1155         yaffs_GrossUnlock(dev);
1156
1157         if (link) {
1158
1159                 return 0;
1160         }
1161
1162         return -EPERM;
1163 }
1164
1165 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1166                          const char *symname)
1167 {
1168         yaffs_Object *obj;
1169         yaffs_Device *dev;
1170         uid_t uid = current->fsuid;
1171         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1172
1173         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_symlink\n"));
1174
1175         dev = yaffs_InodeToObject(dir)->myDev;
1176         yaffs_GrossLock(dev);
1177         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1178                                  S_IFLNK | S_IRWXUGO, uid, gid, symname);
1179         yaffs_GrossUnlock(dev);
1180
1181         if (obj) {
1182
1183                 struct inode *inode;
1184
1185                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1186                 d_instantiate(dentry, inode);
1187                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink created OK\n"));
1188                 return 0;
1189         } else {
1190                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink not created\n"));
1191
1192         }
1193
1194         return -ENOMEM;
1195 }
1196
1197 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1198                              int datasync)
1199 {
1200
1201         yaffs_Object *obj;
1202         yaffs_Device *dev;
1203
1204         obj = yaffs_DentryToObject(dentry);
1205
1206         dev = obj->myDev;
1207
1208         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_object\n"));
1209         yaffs_GrossLock(dev);
1210         yaffs_FlushFile(obj, 1);
1211         yaffs_GrossUnlock(dev);
1212         return 0;
1213 }
1214
1215 /*
1216  * The VFS layer already does all the dentry stuff for rename.
1217  *
1218  * NB: POSIX says you can rename an object over an old object of the same name
1219  */
1220 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1221                         struct inode *new_dir, struct dentry *new_dentry)
1222 {
1223         yaffs_Device *dev;
1224         int retVal = YAFFS_FAIL;
1225         yaffs_Object *target;
1226
1227         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_rename\n"));
1228         dev = yaffs_InodeToObject(old_dir)->myDev;
1229
1230         yaffs_GrossLock(dev);
1231
1232         /* Check if the target is an existing directory that is not empty. */
1233         target =
1234             yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1235                                    new_dentry->d_name.name);
1236
1237
1238
1239         if (target &&
1240             target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1241             !list_empty(&target->variant.directoryVariant.children)) {
1242
1243                 T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n"));
1244
1245                 retVal = YAFFS_FAIL;
1246         } else {
1247
1248                 /* Now does unlinking internally using shadowing mechanism */
1249                 T(YAFFS_TRACE_OS, (KERN_DEBUG "calling yaffs_RenameObject\n"));
1250
1251                 retVal =
1252                     yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1253                                        old_dentry->d_name.name,
1254                                        yaffs_InodeToObject(new_dir),
1255                                        new_dentry->d_name.name);
1256
1257         }
1258         yaffs_GrossUnlock(dev);
1259
1260         if (retVal == YAFFS_OK) {
1261                 if(target) {
1262                         new_dentry->d_inode->i_nlink--;
1263                         mark_inode_dirty(new_dentry->d_inode);
1264                 }
1265
1266                 return 0;
1267         } else {
1268                 return -ENOTEMPTY;
1269         }
1270
1271 }
1272
1273 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1274 {
1275         struct inode *inode = dentry->d_inode;
1276         int error;
1277         yaffs_Device *dev;
1278
1279         T(YAFFS_TRACE_OS,
1280           (KERN_DEBUG "yaffs_setattr of object %d\n",
1281            yaffs_InodeToObject(inode)->objectId));
1282
1283         if ((error = inode_change_ok(inode, attr)) == 0) {
1284
1285                 dev = yaffs_InodeToObject(inode)->myDev;
1286                 yaffs_GrossLock(dev);
1287                 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1288                     YAFFS_OK) {
1289                         error = 0;
1290                 } else {
1291                         error = -EPERM;
1292                 }
1293                 yaffs_GrossUnlock(dev);
1294                 if (!error)
1295                         error = inode_setattr(inode, attr);
1296         }
1297         return error;
1298 }
1299
1300 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1301 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1302 {
1303         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1304         struct super_block *sb = dentry->d_sb;
1305 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1306 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1307 {
1308         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1309 #else
1310 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1311 {
1312         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1313 #endif
1314
1315         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_statfs\n"));
1316
1317         yaffs_GrossLock(dev);
1318
1319         buf->f_type = YAFFS_MAGIC;
1320         buf->f_bsize = sb->s_blocksize;
1321         buf->f_namelen = 255;
1322         if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1323
1324                 buf->f_blocks =
1325                     (dev->endBlock - dev->startBlock +
1326                      1) * dev->nChunksPerBlock / (sb->s_blocksize /
1327                                                   dev->nDataBytesPerChunk);
1328                 buf->f_bfree =
1329                     yaffs_GetNumberOfFreeChunks(dev) / (sb->s_blocksize /
1330                                                         dev->nDataBytesPerChunk);
1331         } else {
1332
1333                 buf->f_blocks =
1334                     (dev->endBlock - dev->startBlock +
1335                      1) * dev->nChunksPerBlock * (dev->nDataBytesPerChunk /
1336                                                   sb->s_blocksize);
1337                 buf->f_bfree =
1338                     yaffs_GetNumberOfFreeChunks(dev) * (dev->nDataBytesPerChunk /
1339                                                         sb->s_blocksize);
1340         }
1341         buf->f_files = 0;
1342         buf->f_ffree = 0;
1343         buf->f_bavail = buf->f_bfree;
1344
1345         yaffs_GrossUnlock(dev);
1346         return 0;
1347 }
1348
1349
1350 /**
1351 static int yaffs_do_sync_fs(struct super_block *sb)
1352 {
1353
1354         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1355         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_do_sync_fs\n"));
1356
1357         if(sb->s_dirt) {
1358                 yaffs_GrossLock(dev);
1359
1360                 if(dev)
1361                         yaffs_CheckpointSave(dev);
1362
1363                 yaffs_GrossUnlock(dev);
1364
1365                 sb->s_dirt = 0;
1366         }
1367         return 0;
1368 }
1369 **/
1370
1371 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1372 static void yaffs_write_super(struct super_block *sb)
1373 #else
1374 static int yaffs_write_super(struct super_block *sb)
1375 #endif
1376 {
1377
1378         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n"));
1379 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
1380         return 0; /* yaffs_do_sync_fs(sb);*/
1381 #endif
1382 }
1383
1384
1385 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1386 static int yaffs_sync_fs(struct super_block *sb, int wait)
1387 #else
1388 static int yaffs_sync_fs(struct super_block *sb)
1389 #endif
1390 {
1391
1392         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n"));
1393
1394         return 0; /* yaffs_do_sync_fs(sb);*/
1395
1396 }
1397
1398
1399 static void yaffs_read_inode(struct inode *inode)
1400 {
1401         /* NB This is called as a side effect of other functions, but
1402          * we had to release the lock to prevent deadlocks, so
1403          * need to lock again.
1404          */
1405
1406         yaffs_Object *obj;
1407         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1408
1409         T(YAFFS_TRACE_OS,
1410           (KERN_DEBUG "yaffs_read_inode for %d\n", (int)inode->i_ino));
1411
1412         yaffs_GrossLock(dev);
1413
1414         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1415
1416         yaffs_FillInodeFromObject(inode, obj);
1417
1418         yaffs_GrossUnlock(dev);
1419 }
1420
1421 static LIST_HEAD(yaffs_dev_list);
1422
1423 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1424 {
1425         yaffs_Device    *dev = yaffs_SuperToDevice(sb);
1426
1427         if( *flags & MS_RDONLY ) {
1428                 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1429
1430                 T(YAFFS_TRACE_OS,
1431                         (KERN_DEBUG "yaffs_remount_fs: %s: RO\n", dev->name ));
1432
1433                 yaffs_GrossLock(dev);
1434
1435                 yaffs_FlushEntireDeviceCache(dev);
1436
1437                 yaffs_CheckpointSave(dev);
1438
1439                 if (mtd->sync)
1440                         mtd->sync(mtd);
1441
1442                 yaffs_GrossUnlock(dev);
1443         }
1444         else {
1445                 T(YAFFS_TRACE_OS,
1446                         (KERN_DEBUG "yaffs_remount_fs: %s: RW\n", dev->name ));
1447         }
1448
1449         return 0;
1450 }
1451
1452 static void yaffs_put_super(struct super_block *sb)
1453 {
1454         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1455
1456         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_put_super\n"));
1457
1458         yaffs_GrossLock(dev);
1459
1460         yaffs_FlushEntireDeviceCache(dev);
1461
1462         yaffs_CheckpointSave(dev);
1463
1464         if (dev->putSuperFunc) {
1465                 dev->putSuperFunc(sb);
1466         }
1467
1468         yaffs_Deinitialise(dev);
1469
1470         yaffs_GrossUnlock(dev);
1471
1472         /* we assume this is protected by lock_kernel() in mount/umount */
1473         list_del(&dev->devList);
1474
1475         if(dev->spareBuffer){
1476                 YFREE(dev->spareBuffer);
1477                 dev->spareBuffer = NULL;
1478         }
1479
1480         kfree(dev);
1481 }
1482
1483
1484 static void yaffs_MTDPutSuper(struct super_block *sb)
1485 {
1486
1487         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1488
1489         if (mtd->sync) {
1490                 mtd->sync(mtd);
1491         }
1492
1493         put_mtd_device(mtd);
1494 }
1495
1496
1497 static void yaffs_MarkSuperBlockDirty(void *vsb)
1498 {
1499         struct super_block *sb = (struct super_block *)vsb;
1500
1501         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_MarkSuperBlockDirty() sb = %p\n",sb));
1502 //      if(sb)
1503 //              sb->s_dirt = 1;
1504 }
1505
1506 typedef struct {
1507         int inband_tags;
1508         int skip_checkpoint_read;
1509         int skip_checkpoint_write;
1510         int no_cache;
1511 } yaffs_options;
1512
1513 #define MAX_OPT_LEN 20
1514 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1515 {
1516         char cur_opt[MAX_OPT_LEN+1];
1517         int p;
1518         int error = 0;
1519
1520         /* Parse through the options which is a comma seperated list */
1521
1522         while(options_str && *options_str && !error){
1523                 memset(cur_opt,0,MAX_OPT_LEN+1);
1524                 p = 0;
1525
1526                 while(*options_str && *options_str != ','){
1527                         if(p < MAX_OPT_LEN){
1528                                 cur_opt[p] = *options_str;
1529                                 p++;
1530                         }
1531                         options_str++;
1532                 }
1533
1534                 if(!strcmp(cur_opt,"inband-tags"))
1535                         options->inband_tags = 1;
1536                 else if(!strcmp(cur_opt,"no-cache"))
1537                         options->no_cache = 1;
1538                 else if(!strcmp(cur_opt,"no-checkpoint-read"))
1539                         options->skip_checkpoint_read = 1;
1540                 else if(!strcmp(cur_opt,"no-checkpoint-write"))
1541                         options->skip_checkpoint_write = 1;
1542                 else if(!strcmp(cur_opt,"no-checkpoint")){
1543                         options->skip_checkpoint_read = 1;
1544                         options->skip_checkpoint_write = 1;
1545                 } else {
1546                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",cur_opt);
1547                         error = 1;
1548                 }
1549
1550         }
1551
1552         return error;
1553 }
1554
1555 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1556                                                      struct super_block *sb,
1557                                                      void *data, int silent)
1558 {
1559         int nBlocks;
1560         struct inode *inode = NULL;
1561         struct dentry *root;
1562         yaffs_Device *dev = 0;
1563         char devname_buf[BDEVNAME_SIZE + 1];
1564         struct mtd_info *mtd;
1565         int err;
1566         char *data_str = (char *)data;
1567
1568         yaffs_options options;
1569
1570         sb->s_magic = YAFFS_MAGIC;
1571         sb->s_op = &yaffs_super_ops;
1572
1573         if (!sb)
1574                 printk(KERN_INFO "yaffs: sb is NULL\n");
1575         else if (!sb->s_dev)
1576                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1577         else if (!yaffs_devname(sb, devname_buf))
1578                 printk(KERN_INFO "yaffs: devname is NULL\n");
1579         else
1580                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1581                        sb->s_dev,
1582                        yaffs_devname(sb, devname_buf));
1583
1584         if(!data_str)
1585                 data_str = "";
1586
1587         printk(KERN_INFO "yaffs: passed flags \"%s\"\n",data_str);
1588
1589         memset(&options,0,sizeof(options));
1590
1591         if(yaffs_parse_options(&options,data_str)){
1592                 /* Option parsing failed */
1593                 return NULL;
1594         }
1595
1596
1597         sb->s_blocksize = PAGE_CACHE_SIZE;
1598         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1599         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1600         T(YAFFS_TRACE_OS,
1601           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1602
1603 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1604         T(YAFFS_TRACE_OS,
1605           ("yaffs: Write verification disabled. All guarantees "
1606            "null and void\n"));
1607 #endif
1608
1609         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1610                                "\"%s\"\n",
1611                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
1612                                yaffs_devname(sb, devname_buf)));
1613
1614         /* Check it's an mtd device..... */
1615         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
1616                 return NULL;    /* This isn't an mtd device */
1617         }
1618         /* Get the device */
1619         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1620         if (!mtd) {
1621                 T(YAFFS_TRACE_ALWAYS,
1622                   ("yaffs: MTD device #%u doesn't appear to exist\n",
1623                    MINOR(sb->s_dev)));
1624                 return NULL;
1625         }
1626         /* Check it's NAND */
1627         if (mtd->type != MTD_NANDFLASH) {
1628                 T(YAFFS_TRACE_ALWAYS,
1629                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1630                 return NULL;
1631         }
1632
1633         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1634         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1635         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1636         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1637         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1638         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1639         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1640         T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1641         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1642         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1643         T(YAFFS_TRACE_OS, (" size %d\n", mtd->size));
1644
1645 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1646
1647         if (yaffsVersion == 1 &&
1648 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1649             mtd->writesize >= 2048) {
1650 #else
1651             mtd->oobblock >= 2048) {
1652 #endif
1653             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n"));
1654             yaffsVersion = 2;
1655         }
1656
1657         /* Added NCB 26/5/2006 for completeness */
1658         if (yaffsVersion == 2 &&
1659 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1660             mtd->writesize == 512) {
1661 #else
1662             mtd->oobblock == 512) {
1663 #endif
1664             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs1\n"));
1665             yaffsVersion = 1;
1666         }
1667
1668 #endif
1669
1670         if (yaffsVersion == 2) {
1671                 /* Check for version 2 style functions */
1672                 if (!mtd->erase ||
1673                     !mtd->block_isbad ||
1674                     !mtd->block_markbad ||
1675                     !mtd->read ||
1676                     !mtd->write ||
1677 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1678                     !mtd->read_oob || !mtd->write_oob) {
1679 #else
1680                     !mtd->write_ecc ||
1681                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1682 #endif
1683                         T(YAFFS_TRACE_ALWAYS,
1684                           ("yaffs: MTD device does not support required "
1685                            "functions\n"));;
1686                         return NULL;
1687                 }
1688
1689 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1690                 if (mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1691 #else
1692                 if (mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1693 #endif
1694                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) {
1695                         T(YAFFS_TRACE_ALWAYS,
1696                           ("yaffs: MTD device does not have the "
1697                            "right page sizes\n"));
1698                         return NULL;
1699                 }
1700         } else {
1701                 /* Check for V1 style functions */
1702                 if (!mtd->erase ||
1703                     !mtd->read ||
1704                     !mtd->write ||
1705 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1706                     !mtd->read_oob || !mtd->write_oob) {
1707 #else
1708                     !mtd->write_ecc ||
1709                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1710 #endif
1711                         T(YAFFS_TRACE_ALWAYS,
1712                           ("yaffs: MTD device does not support required "
1713                            "functions\n"));;
1714                         return NULL;
1715                 }
1716
1717                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
1718                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1719                         T(YAFFS_TRACE_ALWAYS,
1720                           ("yaffs: MTD device does not support have the "
1721                            "right page sizes\n"));
1722                         return NULL;
1723                 }
1724         }
1725
1726         /* OK, so if we got here, we have an MTD that's NAND and looks
1727          * like it has the right capabilities
1728          * Set the yaffs_Device up for mtd
1729          */
1730
1731 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1732         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1733 #else
1734         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1735 #endif
1736         if (!dev) {
1737                 /* Deep shit could not allocate device structure */
1738                 T(YAFFS_TRACE_ALWAYS,
1739                   ("yaffs_read_super: Failed trying to allocate "
1740                    "yaffs_Device. \n"));
1741                 return NULL;
1742         }
1743
1744         memset(dev, 0, sizeof(yaffs_Device));
1745         dev->genericDevice = mtd;
1746         dev->name = mtd->name;
1747
1748         /* Set up the memory size parameters.... */
1749
1750         nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1751         dev->startBlock = 0;
1752         dev->endBlock = nBlocks - 1;
1753         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1754         dev->nDataBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1755         dev->nReservedBlocks = 5;
1756         dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
1757
1758         /* ... and the functions. */
1759         if (yaffsVersion == 2) {
1760                 dev->writeChunkWithTagsToNAND =
1761                     nandmtd2_WriteChunkWithTagsToNAND;
1762                 dev->readChunkWithTagsFromNAND =
1763                     nandmtd2_ReadChunkWithTagsFromNAND;
1764                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1765                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1766                 dev->spareBuffer = YMALLOC(mtd->oobsize);
1767                 dev->isYaffs2 = 1;
1768 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1769                 dev->nDataBytesPerChunk = mtd->writesize;
1770                 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
1771 #else
1772                 dev->nDataBytesPerChunk = mtd->oobblock;
1773                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1774 #endif
1775                 nBlocks = mtd->size / mtd->erasesize;
1776
1777                 dev->nCheckpointReservedBlocks = CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS;
1778                 dev->startBlock = 0;
1779                 dev->endBlock = nBlocks - 1;
1780         } else {
1781                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1782                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1783                 dev->isYaffs2 = 0;
1784         }
1785         /* ... and common functions */
1786         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1787         dev->initialiseNAND = nandmtd_InitialiseNAND;
1788
1789         dev->putSuperFunc = yaffs_MTDPutSuper;
1790
1791         dev->superBlock = (void *)sb;
1792         dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
1793
1794
1795 #ifndef CONFIG_YAFFS_DOES_ECC
1796         dev->useNANDECC = 1;
1797 #endif
1798
1799 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
1800         dev->wideTnodesDisabled = 1;
1801 #endif
1802
1803         dev->skipCheckpointRead = options.skip_checkpoint_read;
1804         dev->skipCheckpointWrite = options.skip_checkpoint_write;
1805
1806         /* we assume this is protected by lock_kernel() in mount/umount */
1807         list_add_tail(&dev->devList, &yaffs_dev_list);
1808
1809         init_MUTEX(&dev->grossLock);
1810
1811         yaffs_GrossLock(dev);
1812
1813         err = yaffs_GutsInitialise(dev);
1814
1815         T(YAFFS_TRACE_OS,
1816           ("yaffs_read_super: guts initialised %s\n",
1817            (err == YAFFS_OK) ? "OK" : "FAILED"));
1818
1819         /* Release lock before yaffs_get_inode() */
1820         yaffs_GrossUnlock(dev);
1821
1822         /* Create root inode */
1823         if (err == YAFFS_OK)
1824                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
1825                                         yaffs_Root(dev));
1826
1827         if (!inode)
1828                 return NULL;
1829
1830         inode->i_op = &yaffs_dir_inode_operations;
1831         inode->i_fop = &yaffs_dir_operations;
1832
1833         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
1834
1835         root = d_alloc_root(inode);
1836
1837         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
1838
1839         if (!root) {
1840                 iput(inode);
1841                 return NULL;
1842         }
1843         sb->s_root = root;
1844
1845         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
1846         return sb;
1847 }
1848
1849
1850 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1851 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
1852                                          int silent)
1853 {
1854         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
1855 }
1856
1857 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1858 static int yaffs_read_super(struct file_system_type *fs,
1859                             int flags, const char *dev_name,
1860                             void *data, struct vfsmount *mnt)
1861 {
1862
1863         return get_sb_bdev(fs, flags, dev_name, data,
1864                            yaffs_internal_read_super_mtd, mnt);
1865 }
1866 #else
1867 static struct super_block *yaffs_read_super(struct file_system_type *fs,
1868                                             int flags, const char *dev_name,
1869                                             void *data)
1870 {
1871
1872         return get_sb_bdev(fs, flags, dev_name, data,
1873                            yaffs_internal_read_super_mtd);
1874 }
1875 #endif
1876
1877 static struct file_system_type yaffs_fs_type = {
1878         .owner = THIS_MODULE,
1879         .name = "yaffs",
1880         .get_sb = yaffs_read_super,
1881         .kill_sb = kill_block_super,
1882         .fs_flags = FS_REQUIRES_DEV,
1883 };
1884 #else
1885 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
1886                                             int silent)
1887 {
1888         return yaffs_internal_read_super(1, sb, data, silent);
1889 }
1890
1891 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
1892                       FS_REQUIRES_DEV);
1893 #endif
1894
1895
1896 #ifdef CONFIG_YAFFS_YAFFS2
1897
1898 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1899 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
1900                                           int silent)
1901 {
1902         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
1903 }
1904
1905 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1906 static int yaffs2_read_super(struct file_system_type *fs,
1907                         int flags, const char *dev_name, void *data,
1908                         struct vfsmount *mnt)
1909 {
1910         return get_sb_bdev(fs, flags, dev_name, data,
1911                         yaffs2_internal_read_super_mtd, mnt);
1912 }
1913 #else
1914 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
1915                                              int flags, const char *dev_name,
1916                                              void *data)
1917 {
1918
1919         return get_sb_bdev(fs, flags, dev_name, data,
1920                            yaffs2_internal_read_super_mtd);
1921 }
1922 #endif
1923
1924 static struct file_system_type yaffs2_fs_type = {
1925         .owner = THIS_MODULE,
1926         .name = "yaffs2",
1927         .get_sb = yaffs2_read_super,
1928         .kill_sb = kill_block_super,
1929         .fs_flags = FS_REQUIRES_DEV,
1930 };
1931 #else
1932 static struct super_block *yaffs2_read_super(struct super_block *sb,
1933                                              void *data, int silent)
1934 {
1935         return yaffs_internal_read_super(2, sb, data, silent);
1936 }
1937
1938 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
1939                       FS_REQUIRES_DEV);
1940 #endif
1941
1942 #endif                          /* CONFIG_YAFFS_YAFFS2 */
1943
1944 static struct proc_dir_entry *my_proc_entry;
1945
1946 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
1947 {
1948         buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
1949         buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
1950         buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
1951         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
1952         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
1953         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
1954         buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
1955         buf += sprintf(buf, "nCheckptResBlocks.. %d\n", dev->nCheckpointReservedBlocks);
1956         buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
1957         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
1958         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
1959         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
1960         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
1961         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
1962         buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
1963         buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
1964         buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
1965         buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
1966         buf +=
1967             sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
1968         buf +=
1969             sprintf(buf, "passiveGCs......... %d\n",
1970                     dev->passiveGarbageCollections);
1971         buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
1972         buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
1973         buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
1974         buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
1975         buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
1976         buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
1977         buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
1978         buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
1979         buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
1980         buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
1981         buf +=
1982             sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
1983         buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
1984         buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
1985
1986         return buf;
1987 }
1988
1989 static int yaffs_proc_read(char *page,
1990                            char **start,
1991                            off_t offset, int count, int *eof, void *data)
1992 {
1993         struct list_head *item;
1994         char *buf = page;
1995         int step = offset;
1996         int n = 0;
1997
1998         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
1999          * We use 'offset' (*ppos) to indicate where we are in devList.
2000          * This also assumes the user has posted a read buffer large
2001          * enough to hold the complete output; but that's life in /proc.
2002          */
2003
2004         *(int *)start = 1;
2005
2006         /* Print header first */
2007         if (step == 0) {
2008                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2009                                "\n%s\n%s\n", yaffs_fs_c_version,
2010                                yaffs_guts_c_version);
2011         }
2012
2013         /* hold lock_kernel while traversing yaffs_dev_list */
2014         lock_kernel();
2015
2016         /* Locate and print the Nth entry.  Order N-squared but N is small. */
2017         list_for_each(item, &yaffs_dev_list) {
2018                 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
2019                 if (n < step) {
2020                         n++;
2021                         continue;
2022                 }
2023                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2024                 buf = yaffs_dump_dev(buf, dev);
2025                 break;
2026         }
2027         unlock_kernel();
2028
2029         return buf - page < count ? buf - page : count;
2030 }
2031
2032 /**
2033  * Set the verbosity of the warnings and error messages.
2034  *
2035  * Note that the names can only be a..z or _ with the current code.
2036  */
2037
2038 static struct {
2039         char *mask_name;
2040         unsigned mask_bitfield;
2041 } mask_flags[] = {
2042         {"allocate", YAFFS_TRACE_ALLOCATE},
2043         {"always", YAFFS_TRACE_ALWAYS},
2044         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2045         {"buffers", YAFFS_TRACE_BUFFERS},
2046         {"bug", YAFFS_TRACE_BUG},
2047         {"checkpt", YAFFS_TRACE_CHECKPOINT},
2048         {"deletion", YAFFS_TRACE_DELETION},
2049         {"erase", YAFFS_TRACE_ERASE},
2050         {"error", YAFFS_TRACE_ERROR},
2051         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2052         {"gc", YAFFS_TRACE_GC},
2053         {"mtd", YAFFS_TRACE_MTD},
2054         {"nandaccess", YAFFS_TRACE_NANDACCESS},
2055         {"os", YAFFS_TRACE_OS},
2056         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2057         {"scan", YAFFS_TRACE_SCAN},
2058         {"tracing", YAFFS_TRACE_TRACING},
2059
2060         {"verify", YAFFS_TRACE_VERIFY},
2061         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2062         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2063         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2064
2065         {"write", YAFFS_TRACE_WRITE},
2066         {"all", 0xffffffff},
2067         {"none", 0},
2068         {NULL, 0},
2069 };
2070
2071 #define MAX_MASK_NAME_LENGTH 40
2072 static int yaffs_proc_write(struct file *file, const char *buf,
2073                                          unsigned long count, void *data)
2074 {
2075         unsigned rg = 0, mask_bitfield;
2076         char *end;
2077         char *mask_name;
2078         char *x;
2079         char substring[MAX_MASK_NAME_LENGTH+1];
2080         int i;
2081         int done = 0;
2082         int add, len = 0;
2083         int pos = 0;
2084
2085         rg = yaffs_traceMask;
2086
2087         while (!done && (pos < count)) {
2088                 done = 1;
2089                 while ((pos < count) && isspace(buf[pos])) {
2090                         pos++;
2091                 }
2092
2093                 switch (buf[pos]) {
2094                 case '+':
2095                 case '-':
2096                 case '=':
2097                         add = buf[pos];
2098                         pos++;
2099                         break;
2100
2101                 default:
2102                         add = ' ';
2103                         break;
2104                 }
2105                 mask_name = NULL;
2106
2107                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2108                 if (end > buf + pos) {
2109                         mask_name = "numeral";
2110                         len = end - (buf + pos);
2111                         done = 0;
2112                 } else {
2113                         for(x = buf + pos, i = 0;
2114                             (*x == '_' || (*x >='a' && *x <= 'z')) &&
2115                             i <MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2116                             substring[i] = *x;
2117                         substring[i] = '\0';
2118
2119                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2120                                 //len = strlen(mask_flags[i].mask_name);
2121                                 //if (strncmp(buf + pos, mask_flags[i].mask_name, len) == 0) {
2122                                 if(strcmp(substring,mask_flags[i].mask_name) == 0){
2123                                         mask_name = mask_flags[i].mask_name;
2124                                         mask_bitfield = mask_flags[i].mask_bitfield;
2125                                         done = 0;
2126                                         break;
2127                                 }
2128                         }
2129                 }
2130
2131                 if (mask_name != NULL) {
2132                         // pos += len;
2133                         done = 0;
2134                         switch(add) {
2135                         case '-':
2136                                 rg &= ~mask_bitfield;
2137                                 break;
2138                         case '+':
2139                                 rg |= mask_bitfield;
2140                                 break;
2141                         case '=':
2142                                 rg = mask_bitfield;
2143                                 break;
2144                         default:
2145                                 rg |= mask_bitfield;
2146                                 break;
2147                         }
2148                 }
2149         }
2150
2151         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2152
2153         printk("new trace = 0x%08X\n",yaffs_traceMask);
2154
2155         if (rg & YAFFS_TRACE_ALWAYS) {
2156                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2157                         char flag;
2158                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2159                         printk("%c%s\n", flag, mask_flags[i].mask_name);
2160                 }
2161         }
2162
2163         return count;
2164 }
2165
2166 /* Stuff to handle installation of file systems */
2167 struct file_system_to_install {
2168         struct file_system_type *fst;
2169         int installed;
2170 };
2171
2172 static struct file_system_to_install fs_to_install[] = {
2173 //#ifdef CONFIG_YAFFS_YAFFS1
2174         {&yaffs_fs_type, 0},
2175 //#endif
2176 //#ifdef CONFIG_YAFFS_YAFFS2
2177         {&yaffs2_fs_type, 0},
2178 //#endif
2179         {NULL, 0}
2180 };
2181
2182 static int __init init_yaffs_fs(void)
2183 {
2184         int error = 0;
2185         struct file_system_to_install *fsinst;
2186
2187         T(YAFFS_TRACE_ALWAYS,
2188           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2189
2190         /* Install the proc_fs entry */
2191         my_proc_entry = create_proc_entry("yaffs",
2192                                                S_IRUGO | S_IFREG,
2193                                                &proc_root);
2194
2195         if (my_proc_entry) {
2196                 my_proc_entry->write_proc = yaffs_proc_write;
2197                 my_proc_entry->read_proc = yaffs_proc_read;
2198                 my_proc_entry->data = NULL;
2199         } else {
2200                 return -ENOMEM;
2201         }
2202
2203         /* Now add the file system entries */
2204
2205         fsinst = fs_to_install;
2206
2207         while (fsinst->fst && !error) {
2208                 error = register_filesystem(fsinst->fst);
2209                 if (!error) {
2210                         fsinst->installed = 1;
2211                 }
2212                 fsinst++;
2213         }
2214
2215         /* Any errors? uninstall  */
2216         if (error) {
2217                 fsinst = fs_to_install;
2218
2219                 while (fsinst->fst) {
2220                         if (fsinst->installed) {
2221                                 unregister_filesystem(fsinst->fst);
2222                                 fsinst->installed = 0;
2223                         }
2224                         fsinst++;
2225                 }
2226         }
2227
2228         return error;
2229 }
2230
2231 static void __exit exit_yaffs_fs(void)
2232 {
2233
2234         struct file_system_to_install *fsinst;
2235
2236         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2237                                " removing. \n"));
2238
2239         remove_proc_entry("yaffs", &proc_root);
2240
2241         fsinst = fs_to_install;
2242
2243         while (fsinst->fst) {
2244                 if (fsinst->installed) {
2245                         unregister_filesystem(fsinst->fst);
2246                         fsinst->installed = 0;
2247                 }
2248                 fsinst++;
2249         }
2250
2251 }
2252
2253 module_init(init_yaffs_fs)
2254 module_exit(exit_yaffs_fs)
2255
2256 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2257 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2258 MODULE_LICENSE("GPL");