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 1.56 2007-01-19 04:07:48 charles Exp $";
  35 extern const char *yaffs_guts_c_version;
  36
  37 #include <linux/version.h>
  38 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
  39 #include <linux/config.h>
  40 #endif
  41 #include <linux/kernel.h>
  42 #include <linux/module.h>
  43 #include <linux/slab.h>
  44 #include <linux/init.h>
  45 #include <linux/list.h>
  46 #include <linux/fs.h>
  47 #include <linux/proc_fs.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/pagemap.h>
  50 #include <linux/mtd/mtd.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/string.h>
  53 #include <linux/ctype.h>
  54
  55 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  56
  57 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  58 #include <asm/statfs.h>
  59 #define UnlockPage(p) unlock_page(p)
  60 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  61
  62 /* FIXME: use sb->s_id instead ? */
  63 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)
  64
  65 #else
  66
  67 #include <linux/locks.h>
  68 #define BDEVNAME_SIZE           0
  69 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
  70
  71 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  72 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
  73 #define __user
  74 #endif
  75
  76 #endif
  77
  78 #include <asm/uaccess.h>
  79
  80 #include "yportenv.h"
  81 #include "yaffs_guts.h"
  82
  83 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS |
  84                            YAFFS_TRACE_BAD_BLOCKS |
  85                            YAFFS_TRACE_CHECKPOINT
  86                            /* | 0xFFFFFFFF */;
  87
  88 #include <linux/mtd/mtd.h>
  89 #include "yaffs_mtdif.h"
  90 #include "yaffs_mtdif2.h"
  91
  92 /*#define T(x) printk x */
  93
  94 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
  95 #define yaffs_InodeToObjectLV(iptr) (iptr)->i_private
  96 #else
  97 #define yaffs_InodeToObjectLV(iptr) (iptr)->u.generic_ip
  98 #endif
  99
 100 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
 101 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
 102
 103 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 104 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
 105 #else
 106 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 107 #endif
 108
 109 static void yaffs_put_super(struct super_block *sb);
 110
 111 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 112                                 loff_t * pos);
 113
 114 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 115 static int yaffs_file_flush(struct file *file, fl_owner_t id);
 116 #else
 117 static int yaffs_file_flush(struct file *file);
 118 #endif
 119
 120 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 121                              int datasync);
 122
 123 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 124
 125 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 126 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 127                         struct nameidata *n);
 128 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 129                                    struct nameidata *n);
 130 #else
 131 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 132 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 133 #endif
 134 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 135                       struct dentry *dentry);
 136 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 137 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 138                          const char *symname);
 139 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 140
 141 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 142 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 143                        dev_t dev);
 144 #else
 145 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 146                        int dev);
 147 #endif
 148 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 149                         struct inode *new_dir, struct dentry *new_dentry);
 150 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 151
 152 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 153 static int yaffs_sync_fs(struct super_block *sb, int wait);
 154 static void yaffs_write_super(struct super_block *sb);
 155 #else
 156 static int yaffs_sync_fs(struct super_block *sb);
 157 static int yaffs_write_super(struct super_block *sb);
 158 #endif
 159
 160 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 161 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
 162 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 163 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 164 #else
 165 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 166 #endif
 167 static void yaffs_read_inode(struct inode *inode);
 168
 169 static void yaffs_put_inode(struct inode *inode);
 170 static void yaffs_delete_inode(struct inode *);
 171 static void yaffs_clear_inode(struct inode *);
 172
 173 static int yaffs_readpage(struct file *file, struct page *page);
 174 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 175 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 176 #else
 177 static int yaffs_writepage(struct page *page);
 178 #endif
 179 static int yaffs_prepare_write(struct file *f, struct page *pg,
 180                                unsigned offset, unsigned to);
 181 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 182                               unsigned to);
 183
 184 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 185                           int buflen);
 186 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 187 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 188 #else
 189 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 190 #endif
 191
 192 static struct address_space_operations yaffs_file_address_operations = {
 193         .readpage = yaffs_readpage,
 194         .writepage = yaffs_writepage,
 195         .prepare_write = yaffs_prepare_write,
 196         .commit_write = yaffs_commit_write,
 197 };
 198
 199 static struct file_operations yaffs_file_operations = {
 200 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 201         .read = do_sync_read,
 202         .write = do_sync_write,
 203         .aio_read = generic_file_aio_read,
 204         .aio_write = generic_file_aio_write,
 205 #else
 206         .read = generic_file_read,
 207         .write = generic_file_write,
 208 #endif
 209         .mmap = generic_file_mmap,
 210         .flush = yaffs_file_flush,
 211         .fsync = yaffs_sync_object,
 212 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 213         .sendfile = generic_file_sendfile,
 214 #endif
 215
 216 };
 217
 218 static struct inode_operations yaffs_file_inode_operations = {
 219         .setattr = yaffs_setattr,
 220 };
 221
 222 static struct inode_operations yaffs_symlink_inode_operations = {
 223         .readlink = yaffs_readlink,
 224         .follow_link = yaffs_follow_link,
 225         .setattr = yaffs_setattr,
 226 };
 227
 228 static struct inode_operations yaffs_dir_inode_operations = {
 229         .create = yaffs_create,
 230         .lookup = yaffs_lookup,
 231         .link = yaffs_link,
 232         .unlink = yaffs_unlink,
 233         .symlink = yaffs_symlink,
 234         .mkdir = yaffs_mkdir,
 235         .rmdir = yaffs_unlink,
 236         .mknod = yaffs_mknod,
 237         .rename = yaffs_rename,
 238         .setattr = yaffs_setattr,
 239 };
 240
 241 static struct file_operations yaffs_dir_operations = {
 242         .read = generic_read_dir,
 243         .readdir = yaffs_readdir,
 244         .fsync = yaffs_sync_object,
 245 };
 246
 247 static struct super_operations yaffs_super_ops = {
 248         .statfs = yaffs_statfs,
 249         .read_inode = yaffs_read_inode,
 250         .put_inode = yaffs_put_inode,
 251         .put_super = yaffs_put_super,
 252         .delete_inode = yaffs_delete_inode,
 253         .clear_inode = yaffs_clear_inode,
 254         .sync_fs = yaffs_sync_fs,
 255         .write_super = yaffs_write_super,
 256 };
 257
 258 static void yaffs_GrossLock(yaffs_Device * dev)
 259 {
 260         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs locking\n"));
 261
 262         down(&dev->grossLock);
 263 }
 264
 265 static void yaffs_GrossUnlock(yaffs_Device * dev)
 266 {
 267         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs unlocking\n"));
 268         up(&dev->grossLock);
 269
 270 }
 271
 272 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 273                           int buflen)
 274 {
 275         unsigned char *alias;
 276         int ret;
 277
 278         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 279
 280         yaffs_GrossLock(dev);
 281
 282         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 283
 284         yaffs_GrossUnlock(dev);
 285
 286         if (!alias)
 287                 return -ENOMEM;
 288
 289         ret = vfs_readlink(dentry, buffer, buflen, alias);
 290         kfree(alias);
 291         return ret;
 292 }
 293
 294 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 295 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 296 #else
 297 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 298 #endif
 299 {
 300         unsigned char *alias;
 301         int ret;
 302         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 303
 304         yaffs_GrossLock(dev);
 305
 306         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 307
 308         yaffs_GrossUnlock(dev);
 309
 310         if (!alias)
 311         {
 312                 ret = -ENOMEM;
 313                 goto out;
 314         }
 315
 316         ret = vfs_follow_link(nd, alias);
 317         kfree(alias);
 318 out:
 319 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 320         return ERR_PTR (ret);
 321 #else
 322         return ret;
 323 #endif
 324 }
 325
 326 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 327                               yaffs_Object * obj);
 328
 329 /*
 330  * Lookup is used to find objects in the fs
 331  */
 332 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 333
 334 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 335                                    struct nameidata *n)
 336 #else
 337 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 338 #endif
 339 {
 340         yaffs_Object *obj;
 341         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 342
 343         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 344
 345         yaffs_GrossLock(dev);
 346
 347         T(YAFFS_TRACE_OS,
 348           (KERN_DEBUG "yaffs_lookup for %d:%s\n",
 349            yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 350
 351         obj =
 352             yaffs_FindObjectByName(yaffs_InodeToObject(dir),
 353                                    dentry->d_name.name);
 354
 355         obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
 356
 357         /* Can't hold gross lock when calling yaffs_get_inode() */
 358         yaffs_GrossUnlock(dev);
 359
 360         if (obj) {
 361                 T(YAFFS_TRACE_OS,
 362                   (KERN_DEBUG "yaffs_lookup found %d\n", obj->objectId));
 363
 364                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 365
 366                 if (inode) {
 367                         T(YAFFS_TRACE_OS,
 368                           (KERN_DEBUG "yaffs_loookup dentry \n"));
 369 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 370  * d_add even if NULL inode */
 371 #if 0
 372                         /*dget(dentry); // try to solve directory bug */
 373                         d_add(dentry, inode);
 374
 375                         /* return dentry; */
 376                         return NULL;
 377 #endif
 378                 }
 379
 380         } else {
 381                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_lookup not found\n"));
 382
 383         }
 384
 385 /* added NCB for 2.5/6 compatability - forces add even if inode is
 386  * NULL which creates dentry hash */
 387         d_add(dentry, inode);
 388
 389         return NULL;
 390         /*      return (ERR_PTR(-EIO)); */
 391
 392 }
 393
 394 /* For now put inode is just for debugging
 395  * Put inode is called when the inode **structure** is put.
 396  */
 397 static void yaffs_put_inode(struct inode *inode)
 398 {
 399         T(YAFFS_TRACE_OS,
 400           ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 401            atomic_read(&inode->i_count)));
 402
 403 }
 404
 405 /* clear is called to tell the fs to release any per-inode data it holds */
 406 static void yaffs_clear_inode(struct inode *inode)
 407 {
 408         yaffs_Object *obj;
 409         yaffs_Device *dev;
 410
 411         obj = yaffs_InodeToObject(inode);
 412
 413         T(YAFFS_TRACE_OS,
 414           ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 415            atomic_read(&inode->i_count),
 416            obj ? "object exists" : "null object"));
 417
 418         if (obj) {
 419                 dev = obj->myDev;
 420                 yaffs_GrossLock(dev);
 421
 422                 /* Clear the association between the inode and
 423                  * the yaffs_Object.
 424                  */
 425                 obj->myInode = NULL;
 426                 yaffs_InodeToObjectLV(inode) = NULL;
 427
 428                 /* If the object freeing was deferred, then the real
 429                  * free happens now.
 430                  * This should fix the inode inconsistency problem.
 431                  */
 432
 433                 yaffs_HandleDeferedFree(obj);
 434
 435                 yaffs_GrossUnlock(dev);
 436         }
 437
 438 }
 439
 440 /* delete is called when the link count is zero and the inode
 441  * is put (ie. nobody wants to know about it anymore, time to
 442  * delete the file).
 443  * NB Must call clear_inode()
 444  */
 445 static void yaffs_delete_inode(struct inode *inode)
 446 {
 447         yaffs_Object *obj = yaffs_InodeToObject(inode);
 448         yaffs_Device *dev;
 449
 450         T(YAFFS_TRACE_OS,
 451           ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 452            atomic_read(&inode->i_count),
 453            obj ? "object exists" : "null object"));
 454
 455         if (obj) {
 456                 dev = obj->myDev;
 457                 yaffs_GrossLock(dev);
 458                 yaffs_DeleteFile(obj);
 459                 yaffs_GrossUnlock(dev);
 460         }
 461 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 462         truncate_inode_pages (&inode->i_data, 0);
 463 #endif
 464         clear_inode(inode);
 465 }
 466
 467 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 468 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 469 #else
 470 static int yaffs_file_flush(struct file *file)
 471 #endif
 472 {
 473         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 474
 475         yaffs_Device *dev = obj->myDev;
 476
 477         T(YAFFS_TRACE_OS,
 478           (KERN_DEBUG "yaffs_file_flush object %d (%s)\n", obj->objectId,
 479            obj->dirty ? "dirty" : "clean"));
 480
 481         yaffs_GrossLock(dev);
 482
 483         yaffs_FlushFile(obj, 1);
 484
 485         yaffs_GrossUnlock(dev);
 486
 487         return 0;
 488 }
 489
 490 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 491 {
 492         /* Lifted from jffs2 */
 493
 494         yaffs_Object *obj;
 495         unsigned char *pg_buf;
 496         int ret;
 497
 498         yaffs_Device *dev;
 499
 500         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage at %08x, size %08x\n",
 501                            (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 502                            (unsigned)PAGE_CACHE_SIZE));
 503
 504         obj = yaffs_DentryToObject(f->f_dentry);
 505
 506         dev = obj->myDev;
 507
 508 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 509         BUG_ON(!PageLocked(pg));
 510 #else
 511         if (!PageLocked(pg))
 512                 PAGE_BUG(pg);
 513 #endif
 514
 515         pg_buf = kmap(pg);
 516         /* FIXME: Can kmap fail? */
 517
 518         yaffs_GrossLock(dev);
 519
 520         ret =
 521             yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT,
 522                                    PAGE_CACHE_SIZE);
 523
 524         yaffs_GrossUnlock(dev);
 525
 526         if (ret >= 0)
 527                 ret = 0;
 528
 529         if (ret) {
 530                 ClearPageUptodate(pg);
 531                 SetPageError(pg);
 532         } else {
 533                 SetPageUptodate(pg);
 534                 ClearPageError(pg);
 535         }
 536
 537         flush_dcache_page(pg);
 538         kunmap(pg);
 539
 540         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage done\n"));
 541         return ret;
 542 }
 543
 544 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 545 {
 546         int ret = yaffs_readpage_nolock(f, pg);
 547         UnlockPage(pg);
 548         return ret;
 549 }
 550
 551 static int yaffs_readpage(struct file *f, struct page *pg)
 552 {
 553         return yaffs_readpage_unlock(f, pg);
 554 }
 555
 556 /* writepage inspired by/stolen from smbfs */
 557
 558 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 559 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 560 #else
 561 static int yaffs_writepage(struct page *page)
 562 #endif
 563 {
 564         struct address_space *mapping = page->mapping;
 565         loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
 566         struct inode *inode;
 567         unsigned long end_index;
 568         char *buffer;
 569         yaffs_Object *obj;
 570         int nWritten = 0;
 571         unsigned nBytes;
 572
 573         if (!mapping)
 574                 BUG();
 575         inode = mapping->host;
 576         if (!inode)
 577                 BUG();
 578
 579         if (offset > inode->i_size) {
 580                 T(YAFFS_TRACE_OS,
 581                   (KERN_DEBUG
 582                    "yaffs_writepage at %08x, inode size = %08x!!!\n",
 583                    (unsigned)(page->index << PAGE_CACHE_SHIFT),
 584                    (unsigned)inode->i_size));
 585                 T(YAFFS_TRACE_OS,
 586                   (KERN_DEBUG "                -> don't care!!\n"));
 587                 unlock_page(page);
 588                 return 0;
 589         }
 590
 591         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 592
 593         /* easy case */
 594         if (page->index < end_index) {
 595                 nBytes = PAGE_CACHE_SIZE;
 596         } else {
 597                 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
 598         }
 599
 600         get_page(page);
 601
 602         buffer = kmap(page);
 603
 604         obj = yaffs_InodeToObject(inode);
 605         yaffs_GrossLock(obj->myDev);
 606
 607         T(YAFFS_TRACE_OS,
 608           (KERN_DEBUG "yaffs_writepage at %08x, size %08x\n",
 609            (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 610         T(YAFFS_TRACE_OS,
 611           (KERN_DEBUG "writepag0: obj = %05x, ino = %05x\n",
 612            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 613
 614         nWritten =
 615             yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT,
 616                                   nBytes, 0);
 617
 618         T(YAFFS_TRACE_OS,
 619           (KERN_DEBUG "writepag1: obj = %05x, ino = %05x\n",
 620            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 621
 622         yaffs_GrossUnlock(obj->myDev);
 623
 624         kunmap(page);
 625         SetPageUptodate(page);
 626         UnlockPage(page);
 627         put_page(page);
 628
 629         return (nWritten == nBytes) ? 0 : -ENOSPC;
 630 }
 631
 632 static int yaffs_prepare_write(struct file *f, struct page *pg,
 633                                unsigned offset, unsigned to)
 634 {
 635
 636         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
 637         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 638                 return yaffs_readpage_nolock(f, pg);
 639
 640         return 0;
 641
 642 }
 643
 644 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 645                               unsigned to)
 646 {
 647
 648         void *addr = page_address(pg) + offset;
 649         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
 650         int nBytes = to - offset;
 651         int nWritten;
 652
 653         unsigned spos = pos;
 654         unsigned saddr = (unsigned)addr;
 655
 656         T(YAFFS_TRACE_OS,
 657           (KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
 658            spos, nBytes));
 659
 660         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
 661
 662         if (nWritten != nBytes) {
 663                 T(YAFFS_TRACE_OS,
 664                   (KERN_DEBUG
 665                    "yaffs_commit_write not same size nWritten %d  nBytes %d\n",
 666                    nWritten, nBytes));
 667                 SetPageError(pg);
 668                 ClearPageUptodate(pg);
 669         } else {
 670                 SetPageUptodate(pg);
 671         }
 672
 673         T(YAFFS_TRACE_OS,
 674           (KERN_DEBUG "yaffs_commit_write returning %d\n",
 675            nWritten == nBytes ? 0 : nWritten));
 676
 677         return nWritten == nBytes ? 0 : nWritten;
 678
 679 }
 680
 681 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
 682 {
 683         if (inode && obj) {
 684
 685
 686                 /* Check mode against the variant type and attempt to repair if broken. */
 687                 __u32 mode = obj->yst_mode;
 688                 switch( obj->variantType ){
 689                 case YAFFS_OBJECT_TYPE_FILE :
 690                         if( ! S_ISREG(mode) ){
 691                                 obj->yst_mode &= ~S_IFMT;
 692                                 obj->yst_mode |= S_IFREG;
 693                         }
 694
 695                         break;
 696                 case YAFFS_OBJECT_TYPE_SYMLINK :
 697                         if( ! S_ISLNK(mode) ){
 698                                 obj->yst_mode &= ~S_IFMT;
 699                                 obj->yst_mode |= S_IFLNK;
 700                         }
 701
 702                         break;
 703                 case YAFFS_OBJECT_TYPE_DIRECTORY :
 704                         if( ! S_ISDIR(mode) ){
 705                                 obj->yst_mode &= ~S_IFMT;
 706                                 obj->yst_mode |= S_IFDIR;
 707                         }
 708
 709                         break;
 710                 case YAFFS_OBJECT_TYPE_UNKNOWN :
 711                 case YAFFS_OBJECT_TYPE_HARDLINK :
 712                 case YAFFS_OBJECT_TYPE_SPECIAL :
 713                 default:
 714                         /* TODO? */
 715                         break;
 716                 }
 717
 718                 inode->i_ino = obj->objectId;
 719                 inode->i_mode = obj->yst_mode;
 720                 inode->i_uid = obj->yst_uid;
 721                 inode->i_gid = obj->yst_gid;
 722 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
 723                 inode->i_blksize = inode->i_sb->s_blocksize;
 724 #endif
 725 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 726
 727                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 728                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
 729                 inode->i_atime.tv_nsec = 0;
 730                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
 731                 inode->i_mtime.tv_nsec = 0;
 732                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
 733                 inode->i_ctime.tv_nsec = 0;
 734 #else
 735                 inode->i_rdev = obj->yst_rdev;
 736                 inode->i_atime = obj->yst_atime;
 737                 inode->i_mtime = obj->yst_mtime;
 738                 inode->i_ctime = obj->yst_ctime;
 739 #endif
 740                 inode->i_size = yaffs_GetObjectFileLength(obj);
 741                 inode->i_blocks = (inode->i_size + 511) >> 9;
 742
 743                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 744
 745                 T(YAFFS_TRACE_OS,
 746                   (KERN_DEBUG
 747                    "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 748                    inode->i_mode, inode->i_uid, inode->i_gid,
 749                    (int)inode->i_size, atomic_read(&inode->i_count)));
 750
 751                 switch (obj->yst_mode & S_IFMT) {
 752                 default:        /* fifo, device or socket */
 753 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 754                         init_special_inode(inode, obj->yst_mode,
 755                                            old_decode_dev(obj->yst_rdev));
 756 #else
 757                         init_special_inode(inode, obj->yst_mode,
 758                                            (dev_t) (obj->yst_rdev));
 759 #endif
 760                         break;
 761                 case S_IFREG:   /* file */
 762                         inode->i_op = &yaffs_file_inode_operations;
 763                         inode->i_fop = &yaffs_file_operations;
 764                         inode->i_mapping->a_ops =
 765                             &yaffs_file_address_operations;
 766                         break;
 767                 case S_IFDIR:   /* directory */
 768                         inode->i_op = &yaffs_dir_inode_operations;
 769                         inode->i_fop = &yaffs_dir_operations;
 770                         break;
 771                 case S_IFLNK:   /* symlink */
 772                         inode->i_op = &yaffs_symlink_inode_operations;
 773                         break;
 774                 }
 775
 776                 yaffs_InodeToObjectLV(inode) = obj;
 777
 778                 obj->myInode = inode;
 779
 780         } else {
 781                 T(YAFFS_TRACE_OS,
 782                   (KERN_DEBUG "yaffs_FileInode invalid parameters\n"));
 783         }
 784
 785 }
 786
 787 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 788                               yaffs_Object * obj)
 789 {
 790         struct inode *inode;
 791
 792         if (!sb) {
 793                 T(YAFFS_TRACE_OS,
 794                   (KERN_DEBUG "yaffs_get_inode for NULL super_block!!\n"));
 795                 return NULL;
 796
 797         }
 798
 799         if (!obj) {
 800                 T(YAFFS_TRACE_OS,
 801                   (KERN_DEBUG "yaffs_get_inode for NULL object!!\n"));
 802                 return NULL;
 803
 804         }
 805
 806         T(YAFFS_TRACE_OS,
 807           (KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId));
 808
 809         inode = iget(sb, obj->objectId);
 810
 811         /* NB Side effect: iget calls back to yaffs_read_inode(). */
 812         /* iget also increments the inode's i_count */
 813         /* NB You can't be holding grossLock or deadlock will happen! */
 814
 815         return inode;
 816 }
 817
 818 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 819                                 loff_t * pos)
 820 {
 821         yaffs_Object *obj;
 822         int nWritten, ipos;
 823         struct inode *inode;
 824         yaffs_Device *dev;
 825
 826         obj = yaffs_DentryToObject(f->f_dentry);
 827
 828         dev = obj->myDev;
 829
 830         yaffs_GrossLock(dev);
 831
 832         inode = f->f_dentry->d_inode;
 833
 834         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) {
 835                 ipos = inode->i_size;
 836         } else {
 837                 ipos = *pos;
 838         }
 839
 840         if (!obj) {
 841                 T(YAFFS_TRACE_OS,
 842                   (KERN_DEBUG "yaffs_file_write: hey obj is null!\n"));
 843         } else {
 844                 T(YAFFS_TRACE_OS,
 845                   (KERN_DEBUG
 846                    "yaffs_file_write about to write writing %d bytes"
 847                    "to object %d at %d\n",
 848                    n, obj->objectId, ipos));
 849         }
 850
 851         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
 852
 853         T(YAFFS_TRACE_OS,
 854           (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n",
 855            n, nWritten, ipos));
 856         if (nWritten > 0) {
 857                 ipos += nWritten;
 858                 *pos = ipos;
 859                 if (ipos > inode->i_size) {
 860                         inode->i_size = ipos;
 861                         inode->i_blocks = (ipos + 511) >> 9;
 862
 863                         T(YAFFS_TRACE_OS,
 864                           (KERN_DEBUG
 865                            "yaffs_file_write size updated to %d bytes, "
 866                            "%d blocks\n",
 867                            ipos, (int)(inode->i_blocks)));
 868                 }
 869
 870         }
 871         yaffs_GrossUnlock(dev);
 872         return nWritten == 0 ? -ENOSPC : nWritten;
 873 }
 874
 875 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 876 {
 877         yaffs_Object *obj;
 878         yaffs_Device *dev;
 879         struct inode *inode = f->f_dentry->d_inode;
 880         unsigned long offset, curoffs;
 881         struct list_head *i;
 882         yaffs_Object *l;
 883
 884         char name[YAFFS_MAX_NAME_LENGTH + 1];
 885
 886         obj = yaffs_DentryToObject(f->f_dentry);
 887         dev = obj->myDev;
 888
 889         yaffs_GrossLock(dev);
 890
 891         offset = f->f_pos;
 892
 893         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
 894
 895         if (offset == 0) {
 896                 T(YAFFS_TRACE_OS,
 897                   (KERN_DEBUG "yaffs_readdir: entry . ino %d \n",
 898                    (int)inode->i_ino));
 899                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR)
 900                     < 0) {
 901                         goto out;
 902                 }
 903                 offset++;
 904                 f->f_pos++;
 905         }
 906         if (offset == 1) {
 907                 T(YAFFS_TRACE_OS,
 908                   (KERN_DEBUG "yaffs_readdir: entry .. ino %d \n",
 909                    (int)f->f_dentry->d_parent->d_inode->i_ino));
 910                 if (filldir
 911                     (dirent, "..", 2, offset,
 912                      f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 913                         goto out;
 914                 }
 915                 offset++;
 916                 f->f_pos++;
 917         }
 918
 919         curoffs = 1;
 920
 921         /* If the directory has changed since the open or last call to
 922            readdir, rewind to after the 2 canned entries. */
 923
 924         if (f->f_version != inode->i_version) {
 925                 offset = 2;
 926                 f->f_pos = offset;
 927                 f->f_version = inode->i_version;
 928         }
 929
 930         list_for_each(i, &obj->variant.directoryVariant.children) {
 931                 curoffs++;
 932                 if (curoffs >= offset) {
 933                         l = list_entry(i, yaffs_Object, siblings);
 934
 935                         yaffs_GetObjectName(l, name,
 936                                             YAFFS_MAX_NAME_LENGTH + 1);
 937                         T(YAFFS_TRACE_OS,
 938                           (KERN_DEBUG "yaffs_readdir: %s inode %d\n", name,
 939                            yaffs_GetObjectInode(l)));
 940
 941                         if (filldir(dirent,
 942                                     name,
 943                                     strlen(name),
 944                                     offset,
 945                                     yaffs_GetObjectInode(l),
 946                                     yaffs_GetObjectType(l))
 947                             < 0) {
 948                                 goto up_and_out;
 949                         }
 950
 951                         offset++;
 952                         f->f_pos++;
 953                 }
 954         }
 955
 956       up_and_out:
 957       out:
 958
 959         yaffs_GrossUnlock(dev);
 960
 961         return 0;
 962 }
 963
 964 /*
 965  * File creation. Allocate an inode, and we're done..
 966  */
 967 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 968 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 969                        dev_t rdev)
 970 #else
 971 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 972                        int rdev)
 973 #endif
 974 {
 975         struct inode *inode;
 976
 977         yaffs_Object *obj = NULL;
 978         yaffs_Device *dev;
 979
 980         yaffs_Object *parent = yaffs_InodeToObject(dir);
 981
 982         int error = -ENOSPC;
 983         uid_t uid = current->fsuid;
 984         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
 985
 986         if((dir->i_mode & S_ISGID) && S_ISDIR(mode))
 987                 mode |= S_ISGID;
 988
 989         if (parent) {
 990                 T(YAFFS_TRACE_OS,
 991                   (KERN_DEBUG "yaffs_mknod: parent object %d type %d\n",
 992                    parent->objectId, parent->variantType));
 993         } else {
 994                 T(YAFFS_TRACE_OS,
 995                   (KERN_DEBUG "yaffs_mknod: could not get parent object\n"));
 996                 return -EPERM;
 997         }
 998
 999         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1000                            "mode %x dev %x\n",
1001                            dentry->d_name.name, mode, rdev));
1002
1003         dev = parent->myDev;
1004
1005         yaffs_GrossLock(dev);
1006
1007         switch (mode & S_IFMT) {
1008         default:
1009                 /* Special (socket, fifo, device...) */
1010                 T(YAFFS_TRACE_OS, (KERN_DEBUG
1011                                    "yaffs_mknod: making special\n"));
1012 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1013                 obj =
1014                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1015                                        gid, old_encode_dev(rdev));
1016 #else
1017                 obj =
1018                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1019                                        gid, rdev);
1020 #endif
1021                 break;
1022         case S_IFREG:           /* file          */
1023                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1024                 obj =
1025                     yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1026                                     gid);
1027                 break;
1028         case S_IFDIR:           /* directory */
1029                 T(YAFFS_TRACE_OS,
1030                   (KERN_DEBUG "yaffs_mknod: making directory\n"));
1031                 obj =
1032                     yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1033                                          uid, gid);
1034                 break;
1035         case S_IFLNK:           /* symlink */
1036                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1037                 obj = NULL;     /* Do we ever get here? */
1038                 break;
1039         }
1040
1041         /* Can not call yaffs_get_inode() with gross lock held */
1042         yaffs_GrossUnlock(dev);
1043
1044         if (obj) {
1045                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1046                 d_instantiate(dentry, inode);
1047                 T(YAFFS_TRACE_OS,
1048                   (KERN_DEBUG "yaffs_mknod created object %d count = %d\n",
1049                    obj->objectId, atomic_read(&inode->i_count)));
1050                 error = 0;
1051         } else {
1052                 T(YAFFS_TRACE_OS,
1053                   (KERN_DEBUG "yaffs_mknod failed making object\n"));
1054                 error = -ENOMEM;
1055         }
1056
1057         return error;
1058 }
1059
1060 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1061 {
1062         int retVal;
1063         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mkdir\n"));
1064         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1065 #if 0
1066         /* attempt to fix dir bug - didn't work */
1067         if (!retVal) {
1068                 dget(dentry);
1069         }
1070 #endif
1071         return retVal;
1072 }
1073
1074 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1075 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1076                         struct nameidata *n)
1077 #else
1078 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1079 #endif
1080 {
1081         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_create\n"));
1082         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1083 }
1084
1085 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1086 {
1087         int retVal;
1088
1089         yaffs_Device *dev;
1090
1091         T(YAFFS_TRACE_OS,
1092           (KERN_DEBUG "yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1093            dentry->d_name.name));
1094
1095         dev = yaffs_InodeToObject(dir)->myDev;
1096
1097         yaffs_GrossLock(dev);
1098
1099         retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1100
1101         if (retVal == YAFFS_OK) {
1102                 dentry->d_inode->i_nlink--;
1103                 dir->i_version++;
1104                 yaffs_GrossUnlock(dev);
1105                 mark_inode_dirty(dentry->d_inode);
1106                 return 0;
1107         }
1108         yaffs_GrossUnlock(dev);
1109         return -ENOTEMPTY;
1110 }
1111
1112 /*
1113  * Create a link...
1114  */
1115 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1116                       struct dentry *dentry)
1117 {
1118         struct inode *inode = old_dentry->d_inode;
1119         yaffs_Object *obj = NULL;
1120         yaffs_Object *link = NULL;
1121         yaffs_Device *dev;
1122
1123         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_link\n"));
1124
1125         obj = yaffs_InodeToObject(inode);
1126         dev = obj->myDev;
1127
1128         yaffs_GrossLock(dev);
1129
1130         if (!S_ISDIR(inode->i_mode))    /* Don't link directories */
1131         {
1132                 link =
1133                     yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1134                                obj);
1135         }
1136
1137         if (link) {
1138                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1139                 d_instantiate(dentry, old_dentry->d_inode);
1140                 atomic_inc(&old_dentry->d_inode->i_count);
1141                 T(YAFFS_TRACE_OS,
1142                   (KERN_DEBUG "yaffs_link link count %d i_count %d\n",
1143                    old_dentry->d_inode->i_nlink,
1144                    atomic_read(&old_dentry->d_inode->i_count)));
1145
1146         }
1147
1148         yaffs_GrossUnlock(dev);
1149
1150         if (link) {
1151
1152                 return 0;
1153         }
1154
1155         return -EPERM;
1156 }
1157
1158 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1159                          const char *symname)
1160 {
1161         yaffs_Object *obj;
1162         yaffs_Device *dev;
1163         uid_t uid = current->fsuid;
1164         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1165
1166         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_symlink\n"));
1167
1168         dev = yaffs_InodeToObject(dir)->myDev;
1169         yaffs_GrossLock(dev);
1170         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1171                                  S_IFLNK | S_IRWXUGO, uid, gid, symname);
1172         yaffs_GrossUnlock(dev);
1173
1174         if (obj) {
1175
1176                 struct inode *inode;
1177
1178                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1179                 d_instantiate(dentry, inode);
1180                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink created OK\n"));
1181                 return 0;
1182         } else {
1183                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink not created\n"));
1184
1185         }
1186
1187         return -ENOMEM;
1188 }
1189
1190 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1191                              int datasync)
1192 {
1193
1194         yaffs_Object *obj;
1195         yaffs_Device *dev;
1196
1197         obj = yaffs_DentryToObject(dentry);
1198
1199         dev = obj->myDev;
1200
1201         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_object\n"));
1202         yaffs_GrossLock(dev);
1203         yaffs_FlushFile(obj, 1);
1204         yaffs_GrossUnlock(dev);
1205         return 0;
1206 }
1207
1208 /*
1209  * The VFS layer already does all the dentry stuff for rename.
1210  *
1211  * NB: POSIX says you can rename an object over an old object of the same name
1212  */
1213 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1214                         struct inode *new_dir, struct dentry *new_dentry)
1215 {
1216         yaffs_Device *dev;
1217         int retVal = YAFFS_FAIL;
1218         yaffs_Object *target;
1219
1220         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_rename\n"));
1221         dev = yaffs_InodeToObject(old_dir)->myDev;
1222
1223         yaffs_GrossLock(dev);
1224
1225         /* Check if the target is an existing directory that is not empty. */
1226         target =
1227             yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1228                                    new_dentry->d_name.name);
1229
1230
1231
1232         if (target &&
1233             target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1234             !list_empty(&target->variant.directoryVariant.children)) {
1235
1236                 T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n"));
1237
1238                 retVal = YAFFS_FAIL;
1239         } else {
1240
1241                 /* Now does unlinking internally using shadowing mechanism */
1242                 T(YAFFS_TRACE_OS, (KERN_DEBUG "calling yaffs_RenameObject\n"));
1243
1244                 retVal =
1245                     yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1246                                        old_dentry->d_name.name,
1247                                        yaffs_InodeToObject(new_dir),
1248                                        new_dentry->d_name.name);
1249
1250         }
1251         yaffs_GrossUnlock(dev);
1252
1253         if (retVal == YAFFS_OK) {
1254                 if(target) {
1255                         new_dentry->d_inode->i_nlink--;
1256                         mark_inode_dirty(new_dentry->d_inode);
1257                 }
1258
1259                 return 0;
1260         } else {
1261                 return -ENOTEMPTY;
1262         }
1263
1264 }
1265
1266 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1267 {
1268         struct inode *inode = dentry->d_inode;
1269         int error;
1270         yaffs_Device *dev;
1271
1272         T(YAFFS_TRACE_OS,
1273           (KERN_DEBUG "yaffs_setattr of object %d\n",
1274            yaffs_InodeToObject(inode)->objectId));
1275
1276         if ((error = inode_change_ok(inode, attr)) == 0) {
1277
1278                 dev = yaffs_InodeToObject(inode)->myDev;
1279                 yaffs_GrossLock(dev);
1280                 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1281                     YAFFS_OK) {
1282                         error = 0;
1283                 } else {
1284                         error = -EPERM;
1285                 }
1286                 yaffs_GrossUnlock(dev);
1287                 if (!error)
1288                         error = inode_setattr(inode, attr);
1289         }
1290         return error;
1291 }
1292
1293 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1294 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1295 {
1296         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1297         struct super_block *sb = dentry->d_sb;
1298 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1299 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1300 {
1301         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1302 #else
1303 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1304 {
1305         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1306 #endif
1307
1308         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_statfs\n"));
1309
1310         yaffs_GrossLock(dev);
1311
1312         buf->f_type = YAFFS_MAGIC;
1313         buf->f_bsize = sb->s_blocksize;
1314         buf->f_namelen = 255;
1315         if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1316
1317                 buf->f_blocks =
1318                     (dev->endBlock - dev->startBlock +
1319                      1) * dev->nChunksPerBlock / (sb->s_blocksize /
1320                                                   dev->nDataBytesPerChunk);
1321                 buf->f_bfree =
1322                     yaffs_GetNumberOfFreeChunks(dev) / (sb->s_blocksize /
1323                                                         dev->nDataBytesPerChunk);
1324         } else {
1325
1326                 buf->f_blocks =
1327                     (dev->endBlock - dev->startBlock +
1328                      1) * dev->nChunksPerBlock * (dev->nDataBytesPerChunk /
1329                                                   sb->s_blocksize);
1330                 buf->f_bfree =
1331                     yaffs_GetNumberOfFreeChunks(dev) * (dev->nDataBytesPerChunk /
1332                                                         sb->s_blocksize);
1333         }
1334         buf->f_files = 0;
1335         buf->f_ffree = 0;
1336         buf->f_bavail = buf->f_bfree;
1337
1338         yaffs_GrossUnlock(dev);
1339         return 0;
1340 }
1341
1342
1343 /**
1344 static int yaffs_do_sync_fs(struct super_block *sb)
1345 {
1346
1347         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1348         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_do_sync_fs\n"));
1349
1350         if(sb->s_dirt) {
1351                 yaffs_GrossLock(dev);
1352
1353                 if(dev)
1354                         yaffs_CheckpointSave(dev);
1355
1356                 yaffs_GrossUnlock(dev);
1357
1358                 sb->s_dirt = 0;
1359         }
1360         return 0;
1361 }
1362 **/
1363
1364 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1365 static void yaffs_write_super(struct super_block *sb)
1366 #else
1367 static int yaffs_write_super(struct super_block *sb)
1368 #endif
1369 {
1370
1371         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n"));
1372 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
1373         return 0; /* yaffs_do_sync_fs(sb);*/
1374 #endif
1375 }
1376
1377
1378 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1379 static int yaffs_sync_fs(struct super_block *sb, int wait)
1380 #else
1381 static int yaffs_sync_fs(struct super_block *sb)
1382 #endif
1383 {
1384
1385         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n"));
1386
1387         return 0; /* yaffs_do_sync_fs(sb);*/
1388
1389 }
1390
1391
1392 static void yaffs_read_inode(struct inode *inode)
1393 {
1394         /* NB This is called as a side effect of other functions, but
1395          * we had to release the lock to prevent deadlocks, so
1396          * need to lock again.
1397          */
1398
1399         yaffs_Object *obj;
1400         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1401
1402         T(YAFFS_TRACE_OS,
1403           (KERN_DEBUG "yaffs_read_inode for %d\n", (int)inode->i_ino));
1404
1405         yaffs_GrossLock(dev);
1406
1407         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1408
1409         yaffs_FillInodeFromObject(inode, obj);
1410
1411         yaffs_GrossUnlock(dev);
1412 }
1413
1414 static LIST_HEAD(yaffs_dev_list);
1415
1416 static void yaffs_put_super(struct super_block *sb)
1417 {
1418         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1419
1420         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_put_super\n"));
1421
1422         yaffs_GrossLock(dev);
1423
1424         yaffs_FlushEntireDeviceCache(dev);
1425
1426         if (dev->putSuperFunc) {
1427                 dev->putSuperFunc(sb);
1428         }
1429
1430         yaffs_CheckpointSave(dev);
1431         yaffs_Deinitialise(dev);
1432
1433         yaffs_GrossUnlock(dev);
1434
1435         /* we assume this is protected by lock_kernel() in mount/umount */
1436         list_del(&dev->devList);
1437
1438         if(dev->spareBuffer){
1439                 YFREE(dev->spareBuffer);
1440                 dev->spareBuffer = NULL;
1441         }
1442
1443         kfree(dev);
1444 }
1445
1446
1447 static void yaffs_MTDPutSuper(struct super_block *sb)
1448 {
1449
1450         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1451
1452         if (mtd->sync) {
1453                 mtd->sync(mtd);
1454         }
1455
1456         put_mtd_device(mtd);
1457 }
1458
1459
1460 static void yaffs_MarkSuperBlockDirty(void *vsb)
1461 {
1462         struct super_block *sb = (struct super_block *)vsb;
1463
1464         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_MarkSuperBlockDirty() sb = %p\n",sb));
1465 //      if(sb)
1466 //              sb->s_dirt = 1;
1467 }
1468
1469 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1470                                                      struct super_block *sb,
1471                                                      void *data, int silent)
1472 {
1473         int nBlocks;
1474         struct inode *inode = NULL;
1475         struct dentry *root;
1476         yaffs_Device *dev = 0;
1477         char devname_buf[BDEVNAME_SIZE + 1];
1478         struct mtd_info *mtd;
1479         int err;
1480
1481         sb->s_magic = YAFFS_MAGIC;
1482         sb->s_op = &yaffs_super_ops;
1483
1484         if (!sb)
1485                 printk(KERN_INFO "yaffs: sb is NULL\n");
1486         else if (!sb->s_dev)
1487                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1488         else if (!yaffs_devname(sb, devname_buf))
1489                 printk(KERN_INFO "yaffs: devname is NULL\n");
1490         else
1491                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1492                        sb->s_dev,
1493                        yaffs_devname(sb, devname_buf));
1494
1495         sb->s_blocksize = PAGE_CACHE_SIZE;
1496         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1497         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1498         T(YAFFS_TRACE_OS,
1499           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1500
1501 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1502         T(YAFFS_TRACE_OS,
1503           ("yaffs: Write verification disabled. All guarantees "
1504            "null and void\n"));
1505 #endif
1506
1507         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1508                                "\"%s\"\n",
1509                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
1510                                yaffs_devname(sb, devname_buf)));
1511
1512         /* Check it's an mtd device..... */
1513         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
1514                 return NULL;    /* This isn't an mtd device */
1515         }
1516         /* Get the device */
1517         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1518         if (!mtd) {
1519                 T(YAFFS_TRACE_ALWAYS,
1520                   ("yaffs: MTD device #%u doesn't appear to exist\n",
1521                    MINOR(sb->s_dev)));
1522                 return NULL;
1523         }
1524         /* Check it's NAND */
1525         if (mtd->type != MTD_NANDFLASH) {
1526                 T(YAFFS_TRACE_ALWAYS,
1527                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1528                 return NULL;
1529         }
1530
1531         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1532         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1533         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1534         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1535         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1536         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1537         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1538 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1539         T(YAFFS_TRACE_OS, (" writesize %d\n", mtd->writesize));
1540 #else
1541         T(YAFFS_TRACE_OS, (" oobblock %d\n", mtd->oobblock));
1542 #endif
1543         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1544         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1545         T(YAFFS_TRACE_OS, (" size %d\n", mtd->size));
1546
1547 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1548
1549         if (yaffsVersion == 1 &&
1550 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1551             mtd->writesize >= 2048) {
1552 #else
1553             mtd->oobblock >= 2048) {
1554 #endif
1555             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n"));
1556             yaffsVersion = 2;
1557         }
1558
1559         /* Added NCB 26/5/2006 for completeness */
1560         if (yaffsVersion == 2 &&
1561 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1562             mtd->writesize == 512) {
1563 #else
1564             mtd->oobblock == 512) {
1565 #endif
1566             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs1\n"));
1567             yaffsVersion = 1;
1568         }
1569
1570 #endif
1571
1572         if (yaffsVersion == 2) {
1573                 /* Check for version 2 style functions */
1574                 if (!mtd->erase ||
1575                     !mtd->block_isbad ||
1576                     !mtd->block_markbad ||
1577                     !mtd->read ||
1578                     !mtd->write ||
1579 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1580                     !mtd->read_oob || !mtd->write_oob) {
1581 #else
1582                     !mtd->write_ecc ||
1583                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1584 #endif
1585                         T(YAFFS_TRACE_ALWAYS,
1586                           ("yaffs: MTD device does not support required "
1587                            "functions\n"));;
1588                         return NULL;
1589                 }
1590
1591 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1592                 if (mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1593 #else
1594                 if (mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1595 #endif
1596                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) {
1597                         T(YAFFS_TRACE_ALWAYS,
1598                           ("yaffs: MTD device does not have the "
1599                            "right page sizes\n"));
1600                         return NULL;
1601                 }
1602         } else {
1603                 /* Check for V1 style functions */
1604                 if (!mtd->erase ||
1605                     !mtd->read ||
1606                     !mtd->write ||
1607 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1608                     !mtd->read_oob || !mtd->write_oob) {
1609 #else
1610                     !mtd->write_ecc ||
1611                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1612 #endif
1613                         T(YAFFS_TRACE_ALWAYS,
1614                           ("yaffs: MTD device does not support required "
1615                            "functions\n"));;
1616                         return NULL;
1617                 }
1618
1619 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1620                 if (mtd->writesize < YAFFS_BYTES_PER_CHUNK ||
1621 #else
1622                 if (mtd->oobblock < YAFFS_BYTES_PER_CHUNK ||
1623 #endif
1624                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1625                         T(YAFFS_TRACE_ALWAYS,
1626                           ("yaffs: MTD device does not support have the "
1627                            "right page sizes\n"));
1628                         return NULL;
1629                 }
1630         }
1631
1632         /* OK, so if we got here, we have an MTD that's NAND and looks
1633          * like it has the right capabilities
1634          * Set the yaffs_Device up for mtd
1635          */
1636
1637 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1638         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1639 #else
1640         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1641 #endif
1642         if (!dev) {
1643                 /* Deep shit could not allocate device structure */
1644                 T(YAFFS_TRACE_ALWAYS,
1645                   ("yaffs_read_super: Failed trying to allocate "
1646                    "yaffs_Device. \n"));
1647                 return NULL;
1648         }
1649
1650         memset(dev, 0, sizeof(yaffs_Device));
1651         dev->genericDevice = mtd;
1652         dev->name = mtd->name;
1653
1654         /* Set up the memory size parameters.... */
1655
1656         nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1657         dev->startBlock = 0;
1658         dev->endBlock = nBlocks - 1;
1659         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1660         dev->nDataBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1661         dev->nReservedBlocks = 5;
1662         dev->nShortOpCaches = 10;       /* Enable short op caching */
1663
1664         /* ... and the functions. */
1665         if (yaffsVersion == 2) {
1666                 dev->writeChunkWithTagsToNAND =
1667                     nandmtd2_WriteChunkWithTagsToNAND;
1668                 dev->readChunkWithTagsFromNAND =
1669                     nandmtd2_ReadChunkWithTagsFromNAND;
1670                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1671                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1672                 dev->spareBuffer = YMALLOC(mtd->oobsize);
1673                 dev->isYaffs2 = 1;
1674 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1675                 dev->nDataBytesPerChunk = mtd->writesize;
1676                 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
1677 #else
1678                 dev->nDataBytesPerChunk = mtd->oobblock;
1679                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1680 #endif
1681                 nBlocks = mtd->size / mtd->erasesize;
1682
1683                 dev->nCheckpointReservedBlocks = CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS;
1684                 dev->startBlock = 0;
1685                 dev->endBlock = nBlocks - 1;
1686         } else {
1687                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1688                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1689                 dev->isYaffs2 = 0;
1690         }
1691         /* ... and common functions */
1692         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1693         dev->initialiseNAND = nandmtd_InitialiseNAND;
1694
1695         dev->putSuperFunc = yaffs_MTDPutSuper;
1696
1697         dev->superBlock = (void *)sb;
1698         dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
1699
1700
1701 #ifndef CONFIG_YAFFS_DOES_ECC
1702         dev->useNANDECC = 1;
1703 #endif
1704
1705 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
1706         dev->wideTnodesDisabled = 1;
1707 #endif
1708
1709         /* we assume this is protected by lock_kernel() in mount/umount */
1710         list_add_tail(&dev->devList, &yaffs_dev_list);
1711
1712         init_MUTEX(&dev->grossLock);
1713
1714         yaffs_GrossLock(dev);
1715
1716         err = yaffs_GutsInitialise(dev);
1717
1718         T(YAFFS_TRACE_OS,
1719           ("yaffs_read_super: guts initialised %s\n",
1720            (err == YAFFS_OK) ? "OK" : "FAILED"));
1721
1722         /* Release lock before yaffs_get_inode() */
1723         yaffs_GrossUnlock(dev);
1724
1725         /* Create root inode */
1726         if (err == YAFFS_OK)
1727                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
1728                                         yaffs_Root(dev));
1729
1730         if (!inode)
1731                 return NULL;
1732
1733         inode->i_op = &yaffs_dir_inode_operations;
1734         inode->i_fop = &yaffs_dir_operations;
1735
1736         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
1737
1738         root = d_alloc_root(inode);
1739
1740         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
1741
1742         if (!root) {
1743                 iput(inode);
1744                 return NULL;
1745         }
1746         sb->s_root = root;
1747
1748         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
1749         return sb;
1750 }
1751
1752
1753 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1754 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
1755                                          int silent)
1756 {
1757         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
1758 }
1759
1760 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1761 static int yaffs_read_super(struct file_system_type *fs,
1762                             int flags, const char *dev_name,
1763                             void *data, struct vfsmount *mnt)
1764 {
1765
1766         return get_sb_bdev(fs, flags, dev_name, data,
1767                            yaffs_internal_read_super_mtd, mnt);
1768 }
1769 #else
1770 static struct super_block *yaffs_read_super(struct file_system_type *fs,
1771                                             int flags, const char *dev_name,
1772                                             void *data)
1773 {
1774
1775         return get_sb_bdev(fs, flags, dev_name, data,
1776                            yaffs_internal_read_super_mtd);
1777 }
1778 #endif
1779
1780 static struct file_system_type yaffs_fs_type = {
1781         .owner = THIS_MODULE,
1782         .name = "yaffs",
1783         .get_sb = yaffs_read_super,
1784         .kill_sb = kill_block_super,
1785         .fs_flags = FS_REQUIRES_DEV,
1786 };
1787 #else
1788 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
1789                                             int silent)
1790 {
1791         return yaffs_internal_read_super(1, sb, data, silent);
1792 }
1793
1794 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
1795                       FS_REQUIRES_DEV);
1796 #endif
1797
1798
1799 #ifdef CONFIG_YAFFS_YAFFS2
1800
1801 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1802 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
1803                                           int silent)
1804 {
1805         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
1806 }
1807
1808 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1809 static int yaffs2_read_super(struct file_system_type *fs,
1810                         int flags, const char *dev_name, void *data,
1811                         struct vfsmount *mnt)
1812 {
1813         return get_sb_bdev(fs, flags, dev_name, data,
1814                         yaffs2_internal_read_super_mtd, mnt);
1815 }
1816 #else
1817 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
1818                                              int flags, const char *dev_name,
1819                                              void *data)
1820 {
1821
1822         return get_sb_bdev(fs, flags, dev_name, data,
1823                            yaffs2_internal_read_super_mtd);
1824 }
1825 #endif
1826
1827 static struct file_system_type yaffs2_fs_type = {
1828         .owner = THIS_MODULE,
1829         .name = "yaffs2",
1830         .get_sb = yaffs2_read_super,
1831         .kill_sb = kill_block_super,
1832         .fs_flags = FS_REQUIRES_DEV,
1833 };
1834 #else
1835 static struct super_block *yaffs2_read_super(struct super_block *sb,
1836                                              void *data, int silent)
1837 {
1838         return yaffs_internal_read_super(2, sb, data, silent);
1839 }
1840
1841 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
1842                       FS_REQUIRES_DEV);
1843 #endif
1844
1845 #endif                          /* CONFIG_YAFFS_YAFFS2 */
1846
1847 static struct proc_dir_entry *my_proc_entry;
1848
1849 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
1850 {
1851         buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
1852         buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
1853         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
1854         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
1855         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
1856         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
1857         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
1858         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
1859         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
1860         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
1861         buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
1862         buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
1863         buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
1864         buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
1865         buf +=
1866             sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
1867         buf +=
1868             sprintf(buf, "passiveGCs......... %d\n",
1869                     dev->passiveGarbageCollections);
1870         buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
1871         buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
1872         buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
1873         buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
1874         buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
1875         buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
1876         buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
1877         buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
1878         buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
1879         buf +=
1880             sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
1881         buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
1882         buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
1883
1884         return buf;
1885 }
1886
1887 static int yaffs_proc_read(char *page,
1888                            char **start,
1889                            off_t offset, int count, int *eof, void *data)
1890 {
1891         struct list_head *item;
1892         char *buf = page;
1893         int step = offset;
1894         int n = 0;
1895
1896         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
1897          * We use 'offset' (*ppos) to indicate where we are in devList.
1898          * This also assumes the user has posted a read buffer large
1899          * enough to hold the complete output; but that's life in /proc.
1900          */
1901
1902         *(int *)start = 1;
1903
1904         /* Print header first */
1905         if (step == 0) {
1906                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
1907                                "\n%s\n%s\n", yaffs_fs_c_version,
1908                                yaffs_guts_c_version);
1909         }
1910
1911         /* hold lock_kernel while traversing yaffs_dev_list */
1912         lock_kernel();
1913
1914         /* Locate and print the Nth entry.  Order N-squared but N is small. */
1915         list_for_each(item, &yaffs_dev_list) {
1916                 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
1917                 if (n < step) {
1918                         n++;
1919                         continue;
1920                 }
1921                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
1922                 buf = yaffs_dump_dev(buf, dev);
1923                 break;
1924         }
1925         unlock_kernel();
1926
1927         return buf - page < count ? buf - page : count;
1928 }
1929
1930 /**
1931  * Set the verbosity of the warnings and error messages.
1932  *
1933  */
1934
1935 static struct {
1936         char *mask_name;
1937         unsigned mask_bitfield;
1938 } mask_flags[] = {
1939         {"allocate", YAFFS_TRACE_ALLOCATE},
1940         {"always", YAFFS_TRACE_ALWAYS},
1941         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
1942         {"buffers", YAFFS_TRACE_BUFFERS},
1943         {"bug", YAFFS_TRACE_BUG},
1944         {"deletion", YAFFS_TRACE_DELETION},
1945         {"erase", YAFFS_TRACE_ERASE},
1946         {"error", YAFFS_TRACE_ERROR},
1947         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
1948         {"gc", YAFFS_TRACE_GC},
1949         {"mtd", YAFFS_TRACE_MTD},
1950         {"nandaccess", YAFFS_TRACE_NANDACCESS},
1951         {"os", YAFFS_TRACE_OS},
1952         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
1953         {"scan", YAFFS_TRACE_SCAN},
1954         {"tracing", YAFFS_TRACE_TRACING},
1955         {"write", YAFFS_TRACE_WRITE},
1956         {"all", 0xffffffff},
1957         {"none", 0},
1958         {NULL, 0},
1959 };
1960
1961 static int yaffs_proc_write(struct file *file, const char *buf,
1962                                          unsigned long count, void *data)
1963 {
1964         unsigned rg = 0, mask_bitfield;
1965         char *end, *mask_name;
1966         int i;
1967         int done = 0;
1968         int add, len = 0;
1969         int pos = 0;
1970
1971         rg = yaffs_traceMask;
1972
1973         while (!done && (pos < count)) {
1974                 done = 1;
1975                 while ((pos < count) && isspace(buf[pos])) {
1976                         pos++;
1977                 }
1978
1979                 switch (buf[pos]) {
1980                 case '+':
1981                 case '-':
1982                 case '=':
1983                         add = buf[pos];
1984                         pos++;
1985                         break;
1986
1987                 default:
1988                         add = ' ';
1989                         break;
1990                 }
1991                 mask_name = NULL;
1992                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
1993                 if (end > buf + pos) {
1994                         mask_name = "numeral";
1995                         len = end - (buf + pos);
1996                         done = 0;
1997                 } else {
1998
1999                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2000                                 len = strlen(mask_flags[i].mask_name);
2001                                 if (strncmp(buf + pos, mask_flags[i].mask_name, len) == 0) {
2002                                         mask_name = mask_flags[i].mask_name;
2003                                         mask_bitfield = mask_flags[i].mask_bitfield;
2004                                         done = 0;
2005                                         break;
2006                                 }
2007                         }
2008                 }
2009
2010                 if (mask_name != NULL) {
2011                         pos += len;
2012                         done = 0;
2013                         switch(add) {
2014                         case '-':
2015                                 rg &= ~mask_bitfield;
2016                                 break;
2017                         case '+':
2018                                 rg |= mask_bitfield;
2019                                 break;
2020                         case '=':
2021                                 rg = mask_bitfield;
2022                                 break;
2023                         default:
2024                                 rg |= mask_bitfield;
2025                                 break;
2026                         }
2027                 }
2028         }
2029
2030         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2031
2032         if (rg & YAFFS_TRACE_ALWAYS) {
2033                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2034                         char flag;
2035                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2036                         printk("%c%s\n", flag, mask_flags[i].mask_name);
2037                 }
2038         }
2039
2040         return count;
2041 }
2042
2043 /* Stuff to handle installation of file systems */
2044 struct file_system_to_install {
2045         struct file_system_type *fst;
2046         int installed;
2047 };
2048
2049 static struct file_system_to_install fs_to_install[] = {
2050 //#ifdef CONFIG_YAFFS_YAFFS1
2051         {&yaffs_fs_type, 0},
2052 //#endif
2053 //#ifdef CONFIG_YAFFS_YAFFS2
2054         {&yaffs2_fs_type, 0},
2055 //#endif
2056         {NULL, 0}
2057 };
2058
2059 static int __init init_yaffs_fs(void)
2060 {
2061         int error = 0;
2062         struct file_system_to_install *fsinst;
2063
2064         T(YAFFS_TRACE_ALWAYS,
2065           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2066
2067         /* Install the proc_fs entry */
2068         my_proc_entry = create_proc_entry("yaffs",
2069                                                S_IRUGO | S_IFREG,
2070                                                &proc_root);
2071
2072         if (my_proc_entry) {
2073                 my_proc_entry->write_proc = yaffs_proc_write;
2074                 my_proc_entry->read_proc = yaffs_proc_read;
2075                 my_proc_entry->data = NULL;
2076         } else {
2077                 return -ENOMEM;
2078         }
2079
2080         /* Now add the file system entries */
2081
2082         fsinst = fs_to_install;
2083
2084         while (fsinst->fst && !error) {
2085                 error = register_filesystem(fsinst->fst);
2086                 if (!error) {
2087                         fsinst->installed = 1;
2088                 }
2089                 fsinst++;
2090         }
2091
2092         /* Any errors? uninstall  */
2093         if (error) {
2094                 fsinst = fs_to_install;
2095
2096                 while (fsinst->fst) {
2097                         if (fsinst->installed) {
2098                                 unregister_filesystem(fsinst->fst);
2099                                 fsinst->installed = 0;
2100                         }
2101                         fsinst++;
2102                 }
2103         }
2104
2105         return error;
2106 }
2107
2108 static void __exit exit_yaffs_fs(void)
2109 {
2110
2111         struct file_system_to_install *fsinst;
2112
2113         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2114                                " removing. \n"));
2115
2116         remove_proc_entry("yaffs", &proc_root);
2117
2118         fsinst = fs_to_install;
2119
2120         while (fsinst->fst) {
2121                 if (fsinst->installed) {
2122                         unregister_filesystem(fsinst->fst);
2123                         fsinst->installed = 0;
2124                 }
2125                 fsinst++;
2126         }
2127
2128 }
2129
2130 module_init(init_yaffs_fs)
2131 module_exit(exit_yaffs_fs)
2132
2133 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2134 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2135 MODULE_LICENSE("GPL");