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 1.61 2007-07-18 19:40:38 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 #include <linux/mtd/mtd.h>
  93 #include "yaffs_mtdif.h"
  94 #include "yaffs_mtdif1.h"
  95 #include "yaffs_mtdif2.h"
  96
  97 unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
  98 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
  99
 100 /* Module Parameters */
 101 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 102 module_param(yaffs_traceMask,uint,0644);
 103 module_param(yaffs_wr_attempts,uint,0644);
 104 #else
 105 MODULE_PARM(yaffs_traceMask,"i");
 106 MODULE_PARM(yaffs_wr_attempts,"i");
 107 #endif
 108
 109 /*#define T(x) printk x */
 110
 111 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 112 #define yaffs_InodeToObjectLV(iptr) (iptr)->i_private
 113 #else
 114 #define yaffs_InodeToObjectLV(iptr) (iptr)->u.generic_ip
 115 #endif
 116
 117 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
 118 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
 119
 120 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 121 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
 122 #else
 123 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 124 #endif
 125
 126 static void yaffs_put_super(struct super_block *sb);
 127
 128 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 129                                 loff_t * pos);
 130
 131 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 132 static int yaffs_file_flush(struct file *file, fl_owner_t id);
 133 #else
 134 static int yaffs_file_flush(struct file *file);
 135 #endif
 136
 137 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 138                              int datasync);
 139
 140 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 141
 142 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 143 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 144                         struct nameidata *n);
 145 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 146                                    struct nameidata *n);
 147 #else
 148 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 149 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 150 #endif
 151 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 152                       struct dentry *dentry);
 153 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 154 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 155                          const char *symname);
 156 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 157
 158 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 159 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 160                        dev_t dev);
 161 #else
 162 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 163                        int dev);
 164 #endif
 165 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 166                         struct inode *new_dir, struct dentry *new_dentry);
 167 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 168
 169 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 170 static int yaffs_sync_fs(struct super_block *sb, int wait);
 171 static void yaffs_write_super(struct super_block *sb);
 172 #else
 173 static int yaffs_sync_fs(struct super_block *sb);
 174 static int yaffs_write_super(struct super_block *sb);
 175 #endif
 176
 177 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 178 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
 179 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 180 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 181 #else
 182 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 183 #endif
 184 static void yaffs_read_inode(struct inode *inode);
 185
 186 static void yaffs_put_inode(struct inode *inode);
 187 static void yaffs_delete_inode(struct inode *);
 188 static void yaffs_clear_inode(struct inode *);
 189
 190 static int yaffs_readpage(struct file *file, struct page *page);
 191 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 192 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 193 #else
 194 static int yaffs_writepage(struct page *page);
 195 #endif
 196 static int yaffs_prepare_write(struct file *f, struct page *pg,
 197                                unsigned offset, unsigned to);
 198 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 199                               unsigned to);
 200
 201 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 202                           int buflen);
 203 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 204 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 205 #else
 206 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 207 #endif
 208
 209 static struct address_space_operations yaffs_file_address_operations = {
 210         .readpage = yaffs_readpage,
 211         .writepage = yaffs_writepage,
 212         .prepare_write = yaffs_prepare_write,
 213         .commit_write = yaffs_commit_write,
 214 };
 215
 216 static struct file_operations yaffs_file_operations = {
 217 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 218         .read = do_sync_read,
 219         .write = do_sync_write,
 220         .aio_read = generic_file_aio_read,
 221         .aio_write = generic_file_aio_write,
 222 #else
 223         .read = generic_file_read,
 224         .write = generic_file_write,
 225 #endif
 226         .mmap = generic_file_mmap,
 227         .flush = yaffs_file_flush,
 228         .fsync = yaffs_sync_object,
 229 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 230         .sendfile = generic_file_sendfile,
 231 #endif
 232
 233 };
 234
 235 static struct inode_operations yaffs_file_inode_operations = {
 236         .setattr = yaffs_setattr,
 237 };
 238
 239 static struct inode_operations yaffs_symlink_inode_operations = {
 240         .readlink = yaffs_readlink,
 241         .follow_link = yaffs_follow_link,
 242         .setattr = yaffs_setattr,
 243 };
 244
 245 static struct inode_operations yaffs_dir_inode_operations = {
 246         .create = yaffs_create,
 247         .lookup = yaffs_lookup,
 248         .link = yaffs_link,
 249         .unlink = yaffs_unlink,
 250         .symlink = yaffs_symlink,
 251         .mkdir = yaffs_mkdir,
 252         .rmdir = yaffs_unlink,
 253         .mknod = yaffs_mknod,
 254         .rename = yaffs_rename,
 255         .setattr = yaffs_setattr,
 256 };
 257
 258 static struct file_operations yaffs_dir_operations = {
 259         .read = generic_read_dir,
 260         .readdir = yaffs_readdir,
 261         .fsync = yaffs_sync_object,
 262 };
 263
 264 static struct super_operations yaffs_super_ops = {
 265         .statfs = yaffs_statfs,
 266         .read_inode = yaffs_read_inode,
 267         .put_inode = yaffs_put_inode,
 268         .put_super = yaffs_put_super,
 269         .delete_inode = yaffs_delete_inode,
 270         .clear_inode = yaffs_clear_inode,
 271         .sync_fs = yaffs_sync_fs,
 272         .write_super = yaffs_write_super,
 273 };
 274
 275 static void yaffs_GrossLock(yaffs_Device * dev)
 276 {
 277         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs locking\n"));
 278
 279         down(&dev->grossLock);
 280 }
 281
 282 static void yaffs_GrossUnlock(yaffs_Device * dev)
 283 {
 284         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs unlocking\n"));
 285         up(&dev->grossLock);
 286
 287 }
 288
 289 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 290                           int buflen)
 291 {
 292         unsigned char *alias;
 293         int ret;
 294
 295         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 296
 297         yaffs_GrossLock(dev);
 298
 299         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 300
 301         yaffs_GrossUnlock(dev);
 302
 303         if (!alias)
 304                 return -ENOMEM;
 305
 306         ret = vfs_readlink(dentry, buffer, buflen, alias);
 307         kfree(alias);
 308         return ret;
 309 }
 310
 311 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 312 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 313 #else
 314 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 315 #endif
 316 {
 317         unsigned char *alias;
 318         int ret;
 319         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 320
 321         yaffs_GrossLock(dev);
 322
 323         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 324
 325         yaffs_GrossUnlock(dev);
 326
 327         if (!alias)
 328         {
 329                 ret = -ENOMEM;
 330                 goto out;
 331         }
 332
 333         ret = vfs_follow_link(nd, alias);
 334         kfree(alias);
 335 out:
 336 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 337         return ERR_PTR (ret);
 338 #else
 339         return ret;
 340 #endif
 341 }
 342
 343 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 344                               yaffs_Object * obj);
 345
 346 /*
 347  * Lookup is used to find objects in the fs
 348  */
 349 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 350
 351 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 352                                    struct nameidata *n)
 353 #else
 354 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 355 #endif
 356 {
 357         yaffs_Object *obj;
 358         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 359
 360         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 361
 362         yaffs_GrossLock(dev);
 363
 364         T(YAFFS_TRACE_OS,
 365           (KERN_DEBUG "yaffs_lookup for %d:%s\n",
 366            yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 367
 368         obj =
 369             yaffs_FindObjectByName(yaffs_InodeToObject(dir),
 370                                    dentry->d_name.name);
 371
 372         obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
 373
 374         /* Can't hold gross lock when calling yaffs_get_inode() */
 375         yaffs_GrossUnlock(dev);
 376
 377         if (obj) {
 378                 T(YAFFS_TRACE_OS,
 379                   (KERN_DEBUG "yaffs_lookup found %d\n", obj->objectId));
 380
 381                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 382
 383                 if (inode) {
 384                         T(YAFFS_TRACE_OS,
 385                           (KERN_DEBUG "yaffs_loookup dentry \n"));
 386 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 387  * d_add even if NULL inode */
 388 #if 0
 389                         /*dget(dentry); // try to solve directory bug */
 390                         d_add(dentry, inode);
 391
 392                         /* return dentry; */
 393                         return NULL;
 394 #endif
 395                 }
 396
 397         } else {
 398                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_lookup not found\n"));
 399
 400         }
 401
 402 /* added NCB for 2.5/6 compatability - forces add even if inode is
 403  * NULL which creates dentry hash */
 404         d_add(dentry, inode);
 405
 406         return NULL;
 407         /*      return (ERR_PTR(-EIO)); */
 408
 409 }
 410
 411 /* For now put inode is just for debugging
 412  * Put inode is called when the inode **structure** is put.
 413  */
 414 static void yaffs_put_inode(struct inode *inode)
 415 {
 416         T(YAFFS_TRACE_OS,
 417           ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 418            atomic_read(&inode->i_count)));
 419
 420 }
 421
 422 /* clear is called to tell the fs to release any per-inode data it holds */
 423 static void yaffs_clear_inode(struct inode *inode)
 424 {
 425         yaffs_Object *obj;
 426         yaffs_Device *dev;
 427
 428         obj = yaffs_InodeToObject(inode);
 429
 430         T(YAFFS_TRACE_OS,
 431           ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 432            atomic_read(&inode->i_count),
 433            obj ? "object exists" : "null object"));
 434
 435         if (obj) {
 436                 dev = obj->myDev;
 437                 yaffs_GrossLock(dev);
 438
 439                 /* Clear the association between the inode and
 440                  * the yaffs_Object.
 441                  */
 442                 obj->myInode = NULL;
 443                 yaffs_InodeToObjectLV(inode) = NULL;
 444
 445                 /* If the object freeing was deferred, then the real
 446                  * free happens now.
 447                  * This should fix the inode inconsistency problem.
 448                  */
 449
 450                 yaffs_HandleDeferedFree(obj);
 451
 452                 yaffs_GrossUnlock(dev);
 453         }
 454
 455 }
 456
 457 /* delete is called when the link count is zero and the inode
 458  * is put (ie. nobody wants to know about it anymore, time to
 459  * delete the file).
 460  * NB Must call clear_inode()
 461  */
 462 static void yaffs_delete_inode(struct inode *inode)
 463 {
 464         yaffs_Object *obj = yaffs_InodeToObject(inode);
 465         yaffs_Device *dev;
 466
 467         T(YAFFS_TRACE_OS,
 468           ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 469            atomic_read(&inode->i_count),
 470            obj ? "object exists" : "null object"));
 471
 472         if (obj) {
 473                 dev = obj->myDev;
 474                 yaffs_GrossLock(dev);
 475                 yaffs_DeleteFile(obj);
 476                 yaffs_GrossUnlock(dev);
 477         }
 478 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 479         truncate_inode_pages (&inode->i_data, 0);
 480 #endif
 481         clear_inode(inode);
 482 }
 483
 484 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 485 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 486 #else
 487 static int yaffs_file_flush(struct file *file)
 488 #endif
 489 {
 490         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 491
 492         yaffs_Device *dev = obj->myDev;
 493
 494         T(YAFFS_TRACE_OS,
 495           (KERN_DEBUG "yaffs_file_flush object %d (%s)\n", obj->objectId,
 496            obj->dirty ? "dirty" : "clean"));
 497
 498         yaffs_GrossLock(dev);
 499
 500         yaffs_FlushFile(obj, 1);
 501
 502         yaffs_GrossUnlock(dev);
 503
 504         return 0;
 505 }
 506
 507 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 508 {
 509         /* Lifted from jffs2 */
 510
 511         yaffs_Object *obj;
 512         unsigned char *pg_buf;
 513         int ret;
 514
 515         yaffs_Device *dev;
 516
 517         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage at %08x, size %08x\n",
 518                            (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 519                            (unsigned)PAGE_CACHE_SIZE));
 520
 521         obj = yaffs_DentryToObject(f->f_dentry);
 522
 523         dev = obj->myDev;
 524
 525 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 526         BUG_ON(!PageLocked(pg));
 527 #else
 528         if (!PageLocked(pg))
 529                 PAGE_BUG(pg);
 530 #endif
 531
 532         pg_buf = kmap(pg);
 533         /* FIXME: Can kmap fail? */
 534
 535         yaffs_GrossLock(dev);
 536
 537         ret =
 538             yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT,
 539                                    PAGE_CACHE_SIZE);
 540
 541         yaffs_GrossUnlock(dev);
 542
 543         if (ret >= 0)
 544                 ret = 0;
 545
 546         if (ret) {
 547                 ClearPageUptodate(pg);
 548                 SetPageError(pg);
 549         } else {
 550                 SetPageUptodate(pg);
 551                 ClearPageError(pg);
 552         }
 553
 554         flush_dcache_page(pg);
 555         kunmap(pg);
 556
 557         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage done\n"));
 558         return ret;
 559 }
 560
 561 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 562 {
 563         int ret = yaffs_readpage_nolock(f, pg);
 564         UnlockPage(pg);
 565         return ret;
 566 }
 567
 568 static int yaffs_readpage(struct file *f, struct page *pg)
 569 {
 570         return yaffs_readpage_unlock(f, pg);
 571 }
 572
 573 /* writepage inspired by/stolen from smbfs */
 574
 575 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 576 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 577 #else
 578 static int yaffs_writepage(struct page *page)
 579 #endif
 580 {
 581         struct address_space *mapping = page->mapping;
 582         loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
 583         struct inode *inode;
 584         unsigned long end_index;
 585         char *buffer;
 586         yaffs_Object *obj;
 587         int nWritten = 0;
 588         unsigned nBytes;
 589
 590         if (!mapping)
 591                 BUG();
 592         inode = mapping->host;
 593         if (!inode)
 594                 BUG();
 595
 596         if (offset > inode->i_size) {
 597                 T(YAFFS_TRACE_OS,
 598                   (KERN_DEBUG
 599                    "yaffs_writepage at %08x, inode size = %08x!!!\n",
 600                    (unsigned)(page->index << PAGE_CACHE_SHIFT),
 601                    (unsigned)inode->i_size));
 602                 T(YAFFS_TRACE_OS,
 603                   (KERN_DEBUG "                -> don't care!!\n"));
 604                 unlock_page(page);
 605                 return 0;
 606         }
 607
 608         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 609
 610         /* easy case */
 611         if (page->index < end_index) {
 612                 nBytes = PAGE_CACHE_SIZE;
 613         } else {
 614                 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
 615         }
 616
 617         get_page(page);
 618
 619         buffer = kmap(page);
 620
 621         obj = yaffs_InodeToObject(inode);
 622         yaffs_GrossLock(obj->myDev);
 623
 624         T(YAFFS_TRACE_OS,
 625           (KERN_DEBUG "yaffs_writepage at %08x, size %08x\n",
 626            (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 627         T(YAFFS_TRACE_OS,
 628           (KERN_DEBUG "writepag0: obj = %05x, ino = %05x\n",
 629            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 630
 631         nWritten =
 632             yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT,
 633                                   nBytes, 0);
 634
 635         T(YAFFS_TRACE_OS,
 636           (KERN_DEBUG "writepag1: obj = %05x, ino = %05x\n",
 637            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 638
 639         yaffs_GrossUnlock(obj->myDev);
 640
 641         kunmap(page);
 642         SetPageUptodate(page);
 643         UnlockPage(page);
 644         put_page(page);
 645
 646         return (nWritten == nBytes) ? 0 : -ENOSPC;
 647 }
 648
 649 static int yaffs_prepare_write(struct file *f, struct page *pg,
 650                                unsigned offset, unsigned to)
 651 {
 652
 653         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
 654         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 655                 return yaffs_readpage_nolock(f, pg);
 656
 657         return 0;
 658
 659 }
 660
 661 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 662                               unsigned to)
 663 {
 664
 665         void *addr = page_address(pg) + offset;
 666         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
 667         int nBytes = to - offset;
 668         int nWritten;
 669
 670         unsigned spos = pos;
 671         unsigned saddr = (unsigned)addr;
 672
 673         T(YAFFS_TRACE_OS,
 674           (KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
 675            spos, nBytes));
 676
 677         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
 678
 679         if (nWritten != nBytes) {
 680                 T(YAFFS_TRACE_OS,
 681                   (KERN_DEBUG
 682                    "yaffs_commit_write not same size nWritten %d  nBytes %d\n",
 683                    nWritten, nBytes));
 684                 SetPageError(pg);
 685                 ClearPageUptodate(pg);
 686         } else {
 687                 SetPageUptodate(pg);
 688         }
 689
 690         T(YAFFS_TRACE_OS,
 691           (KERN_DEBUG "yaffs_commit_write returning %d\n",
 692            nWritten == nBytes ? 0 : nWritten));
 693
 694         return nWritten == nBytes ? 0 : nWritten;
 695
 696 }
 697
 698 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
 699 {
 700         if (inode && obj) {
 701
 702
 703                 /* Check mode against the variant type and attempt to repair if broken. */
 704                 __u32 mode = obj->yst_mode;
 705                 switch( obj->variantType ){
 706                 case YAFFS_OBJECT_TYPE_FILE :
 707                         if( ! S_ISREG(mode) ){
 708                                 obj->yst_mode &= ~S_IFMT;
 709                                 obj->yst_mode |= S_IFREG;
 710                         }
 711
 712                         break;
 713                 case YAFFS_OBJECT_TYPE_SYMLINK :
 714                         if( ! S_ISLNK(mode) ){
 715                                 obj->yst_mode &= ~S_IFMT;
 716                                 obj->yst_mode |= S_IFLNK;
 717                         }
 718
 719                         break;
 720                 case YAFFS_OBJECT_TYPE_DIRECTORY :
 721                         if( ! S_ISDIR(mode) ){
 722                                 obj->yst_mode &= ~S_IFMT;
 723                                 obj->yst_mode |= S_IFDIR;
 724                         }
 725
 726                         break;
 727                 case YAFFS_OBJECT_TYPE_UNKNOWN :
 728                 case YAFFS_OBJECT_TYPE_HARDLINK :
 729                 case YAFFS_OBJECT_TYPE_SPECIAL :
 730                 default:
 731                         /* TODO? */
 732                         break;
 733                 }
 734
 735                 inode->i_ino = obj->objectId;
 736                 inode->i_mode = obj->yst_mode;
 737                 inode->i_uid = obj->yst_uid;
 738                 inode->i_gid = obj->yst_gid;
 739 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
 740                 inode->i_blksize = inode->i_sb->s_blocksize;
 741 #endif
 742 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 743
 744                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 745                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
 746                 inode->i_atime.tv_nsec = 0;
 747                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
 748                 inode->i_mtime.tv_nsec = 0;
 749                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
 750                 inode->i_ctime.tv_nsec = 0;
 751 #else
 752                 inode->i_rdev = obj->yst_rdev;
 753                 inode->i_atime = obj->yst_atime;
 754                 inode->i_mtime = obj->yst_mtime;
 755                 inode->i_ctime = obj->yst_ctime;
 756 #endif
 757                 inode->i_size = yaffs_GetObjectFileLength(obj);
 758                 inode->i_blocks = (inode->i_size + 511) >> 9;
 759
 760                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 761
 762                 T(YAFFS_TRACE_OS,
 763                   (KERN_DEBUG
 764                    "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 765                    inode->i_mode, inode->i_uid, inode->i_gid,
 766                    (int)inode->i_size, atomic_read(&inode->i_count)));
 767
 768                 switch (obj->yst_mode & S_IFMT) {
 769                 default:        /* fifo, device or socket */
 770 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 771                         init_special_inode(inode, obj->yst_mode,
 772                                            old_decode_dev(obj->yst_rdev));
 773 #else
 774                         init_special_inode(inode, obj->yst_mode,
 775                                            (dev_t) (obj->yst_rdev));
 776 #endif
 777                         break;
 778                 case S_IFREG:   /* file */
 779                         inode->i_op = &yaffs_file_inode_operations;
 780                         inode->i_fop = &yaffs_file_operations;
 781                         inode->i_mapping->a_ops =
 782                             &yaffs_file_address_operations;
 783                         break;
 784                 case S_IFDIR:   /* directory */
 785                         inode->i_op = &yaffs_dir_inode_operations;
 786                         inode->i_fop = &yaffs_dir_operations;
 787                         break;
 788                 case S_IFLNK:   /* symlink */
 789                         inode->i_op = &yaffs_symlink_inode_operations;
 790                         break;
 791                 }
 792
 793                 yaffs_InodeToObjectLV(inode) = obj;
 794
 795                 obj->myInode = inode;
 796
 797         } else {
 798                 T(YAFFS_TRACE_OS,
 799                   (KERN_DEBUG "yaffs_FileInode invalid parameters\n"));
 800         }
 801
 802 }
 803
 804 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 805                               yaffs_Object * obj)
 806 {
 807         struct inode *inode;
 808
 809         if (!sb) {
 810                 T(YAFFS_TRACE_OS,
 811                   (KERN_DEBUG "yaffs_get_inode for NULL super_block!!\n"));
 812                 return NULL;
 813
 814         }
 815
 816         if (!obj) {
 817                 T(YAFFS_TRACE_OS,
 818                   (KERN_DEBUG "yaffs_get_inode for NULL object!!\n"));
 819                 return NULL;
 820
 821         }
 822
 823         T(YAFFS_TRACE_OS,
 824           (KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId));
 825
 826         inode = iget(sb, obj->objectId);
 827
 828         /* NB Side effect: iget calls back to yaffs_read_inode(). */
 829         /* iget also increments the inode's i_count */
 830         /* NB You can't be holding grossLock or deadlock will happen! */
 831
 832         return inode;
 833 }
 834
 835 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 836                                 loff_t * pos)
 837 {
 838         yaffs_Object *obj;
 839         int nWritten, ipos;
 840         struct inode *inode;
 841         yaffs_Device *dev;
 842
 843         obj = yaffs_DentryToObject(f->f_dentry);
 844
 845         dev = obj->myDev;
 846
 847         yaffs_GrossLock(dev);
 848
 849         inode = f->f_dentry->d_inode;
 850
 851         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) {
 852                 ipos = inode->i_size;
 853         } else {
 854                 ipos = *pos;
 855         }
 856
 857         if (!obj) {
 858                 T(YAFFS_TRACE_OS,
 859                   (KERN_DEBUG "yaffs_file_write: hey obj is null!\n"));
 860         } else {
 861                 T(YAFFS_TRACE_OS,
 862                   (KERN_DEBUG
 863                    "yaffs_file_write about to write writing %d bytes"
 864                    "to object %d at %d\n",
 865                    n, obj->objectId, ipos));
 866         }
 867
 868         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
 869
 870         T(YAFFS_TRACE_OS,
 871           (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n",
 872            n, nWritten, ipos));
 873         if (nWritten > 0) {
 874                 ipos += nWritten;
 875                 *pos = ipos;
 876                 if (ipos > inode->i_size) {
 877                         inode->i_size = ipos;
 878                         inode->i_blocks = (ipos + 511) >> 9;
 879
 880                         T(YAFFS_TRACE_OS,
 881                           (KERN_DEBUG
 882                            "yaffs_file_write size updated to %d bytes, "
 883                            "%d blocks\n",
 884                            ipos, (int)(inode->i_blocks)));
 885                 }
 886
 887         }
 888         yaffs_GrossUnlock(dev);
 889         return nWritten == 0 ? -ENOSPC : nWritten;
 890 }
 891
 892 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 893 {
 894         yaffs_Object *obj;
 895         yaffs_Device *dev;
 896         struct inode *inode = f->f_dentry->d_inode;
 897         unsigned long offset, curoffs;
 898         struct list_head *i;
 899         yaffs_Object *l;
 900
 901         char name[YAFFS_MAX_NAME_LENGTH + 1];
 902
 903         obj = yaffs_DentryToObject(f->f_dentry);
 904         dev = obj->myDev;
 905
 906         yaffs_GrossLock(dev);
 907
 908         offset = f->f_pos;
 909
 910         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
 911
 912         if (offset == 0) {
 913                 T(YAFFS_TRACE_OS,
 914                   (KERN_DEBUG "yaffs_readdir: entry . ino %d \n",
 915                    (int)inode->i_ino));
 916                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR)
 917                     < 0) {
 918                         goto out;
 919                 }
 920                 offset++;
 921                 f->f_pos++;
 922         }
 923         if (offset == 1) {
 924                 T(YAFFS_TRACE_OS,
 925                   (KERN_DEBUG "yaffs_readdir: entry .. ino %d \n",
 926                    (int)f->f_dentry->d_parent->d_inode->i_ino));
 927                 if (filldir
 928                     (dirent, "..", 2, offset,
 929                      f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 930                         goto out;
 931                 }
 932                 offset++;
 933                 f->f_pos++;
 934         }
 935
 936         curoffs = 1;
 937
 938         /* If the directory has changed since the open or last call to
 939            readdir, rewind to after the 2 canned entries. */
 940
 941         if (f->f_version != inode->i_version) {
 942                 offset = 2;
 943                 f->f_pos = offset;
 944                 f->f_version = inode->i_version;
 945         }
 946
 947         list_for_each(i, &obj->variant.directoryVariant.children) {
 948                 curoffs++;
 949                 if (curoffs >= offset) {
 950                         l = list_entry(i, yaffs_Object, siblings);
 951
 952                         yaffs_GetObjectName(l, name,
 953                                             YAFFS_MAX_NAME_LENGTH + 1);
 954                         T(YAFFS_TRACE_OS,
 955                           (KERN_DEBUG "yaffs_readdir: %s inode %d\n", name,
 956                            yaffs_GetObjectInode(l)));
 957
 958                         if (filldir(dirent,
 959                                     name,
 960                                     strlen(name),
 961                                     offset,
 962                                     yaffs_GetObjectInode(l),
 963                                     yaffs_GetObjectType(l))
 964                             < 0) {
 965                                 goto up_and_out;
 966                         }
 967
 968                         offset++;
 969                         f->f_pos++;
 970                 }
 971         }
 972
 973       up_and_out:
 974       out:
 975
 976         yaffs_GrossUnlock(dev);
 977
 978         return 0;
 979 }
 980
 981 /*
 982  * File creation. Allocate an inode, and we're done..
 983  */
 984 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 985 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 986                        dev_t rdev)
 987 #else
 988 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 989                        int rdev)
 990 #endif
 991 {
 992         struct inode *inode;
 993
 994         yaffs_Object *obj = NULL;
 995         yaffs_Device *dev;
 996
 997         yaffs_Object *parent = yaffs_InodeToObject(dir);
 998
 999         int error = -ENOSPC;
1000         uid_t uid = current->fsuid;
1001         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1002
1003         if((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1004                 mode |= S_ISGID;
1005
1006         if (parent) {
1007                 T(YAFFS_TRACE_OS,
1008                   (KERN_DEBUG "yaffs_mknod: parent object %d type %d\n",
1009                    parent->objectId, parent->variantType));
1010         } else {
1011                 T(YAFFS_TRACE_OS,
1012                   (KERN_DEBUG "yaffs_mknod: could not get parent object\n"));
1013                 return -EPERM;
1014         }
1015
1016         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1017                            "mode %x dev %x\n",
1018                            dentry->d_name.name, mode, rdev));
1019
1020         dev = parent->myDev;
1021
1022         yaffs_GrossLock(dev);
1023
1024         switch (mode & S_IFMT) {
1025         default:
1026                 /* Special (socket, fifo, device...) */
1027                 T(YAFFS_TRACE_OS, (KERN_DEBUG
1028                                    "yaffs_mknod: making special\n"));
1029 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1030                 obj =
1031                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1032                                        gid, old_encode_dev(rdev));
1033 #else
1034                 obj =
1035                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1036                                        gid, rdev);
1037 #endif
1038                 break;
1039         case S_IFREG:           /* file          */
1040                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1041                 obj =
1042                     yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1043                                     gid);
1044                 break;
1045         case S_IFDIR:           /* directory */
1046                 T(YAFFS_TRACE_OS,
1047                   (KERN_DEBUG "yaffs_mknod: making directory\n"));
1048                 obj =
1049                     yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1050                                          uid, gid);
1051                 break;
1052         case S_IFLNK:           /* symlink */
1053                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1054                 obj = NULL;     /* Do we ever get here? */
1055                 break;
1056         }
1057
1058         /* Can not call yaffs_get_inode() with gross lock held */
1059         yaffs_GrossUnlock(dev);
1060
1061         if (obj) {
1062                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1063                 d_instantiate(dentry, inode);
1064                 T(YAFFS_TRACE_OS,
1065                   (KERN_DEBUG "yaffs_mknod created object %d count = %d\n",
1066                    obj->objectId, atomic_read(&inode->i_count)));
1067                 error = 0;
1068         } else {
1069                 T(YAFFS_TRACE_OS,
1070                   (KERN_DEBUG "yaffs_mknod failed making object\n"));
1071                 error = -ENOMEM;
1072         }
1073
1074         return error;
1075 }
1076
1077 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1078 {
1079         int retVal;
1080         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mkdir\n"));
1081         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1082 #if 0
1083         /* attempt to fix dir bug - didn't work */
1084         if (!retVal) {
1085                 dget(dentry);
1086         }
1087 #endif
1088         return retVal;
1089 }
1090
1091 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1092 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1093                         struct nameidata *n)
1094 #else
1095 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1096 #endif
1097 {
1098         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_create\n"));
1099         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1100 }
1101
1102 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1103 {
1104         int retVal;
1105
1106         yaffs_Device *dev;
1107
1108         T(YAFFS_TRACE_OS,
1109           (KERN_DEBUG "yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1110            dentry->d_name.name));
1111
1112         dev = yaffs_InodeToObject(dir)->myDev;
1113
1114         yaffs_GrossLock(dev);
1115
1116         retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1117
1118         if (retVal == YAFFS_OK) {
1119                 dentry->d_inode->i_nlink--;
1120                 dir->i_version++;
1121                 yaffs_GrossUnlock(dev);
1122                 mark_inode_dirty(dentry->d_inode);
1123                 return 0;
1124         }
1125         yaffs_GrossUnlock(dev);
1126         return -ENOTEMPTY;
1127 }
1128
1129 /*
1130  * Create a link...
1131  */
1132 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1133                       struct dentry *dentry)
1134 {
1135         struct inode *inode = old_dentry->d_inode;
1136         yaffs_Object *obj = NULL;
1137         yaffs_Object *link = NULL;
1138         yaffs_Device *dev;
1139
1140         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_link\n"));
1141
1142         obj = yaffs_InodeToObject(inode);
1143         dev = obj->myDev;
1144
1145         yaffs_GrossLock(dev);
1146
1147         if (!S_ISDIR(inode->i_mode))    /* Don't link directories */
1148         {
1149                 link =
1150                     yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1151                                obj);
1152         }
1153
1154         if (link) {
1155                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1156                 d_instantiate(dentry, old_dentry->d_inode);
1157                 atomic_inc(&old_dentry->d_inode->i_count);
1158                 T(YAFFS_TRACE_OS,
1159                   (KERN_DEBUG "yaffs_link link count %d i_count %d\n",
1160                    old_dentry->d_inode->i_nlink,
1161                    atomic_read(&old_dentry->d_inode->i_count)));
1162
1163         }
1164
1165         yaffs_GrossUnlock(dev);
1166
1167         if (link) {
1168
1169                 return 0;
1170         }
1171
1172         return -EPERM;
1173 }
1174
1175 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1176                          const char *symname)
1177 {
1178         yaffs_Object *obj;
1179         yaffs_Device *dev;
1180         uid_t uid = current->fsuid;
1181         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1182
1183         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_symlink\n"));
1184
1185         dev = yaffs_InodeToObject(dir)->myDev;
1186         yaffs_GrossLock(dev);
1187         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1188                                  S_IFLNK | S_IRWXUGO, uid, gid, symname);
1189         yaffs_GrossUnlock(dev);
1190
1191         if (obj) {
1192
1193                 struct inode *inode;
1194
1195                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1196                 d_instantiate(dentry, inode);
1197                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink created OK\n"));
1198                 return 0;
1199         } else {
1200                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink not created\n"));
1201
1202         }
1203
1204         return -ENOMEM;
1205 }
1206
1207 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1208                              int datasync)
1209 {
1210
1211         yaffs_Object *obj;
1212         yaffs_Device *dev;
1213
1214         obj = yaffs_DentryToObject(dentry);
1215
1216         dev = obj->myDev;
1217
1218         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_object\n"));
1219         yaffs_GrossLock(dev);
1220         yaffs_FlushFile(obj, 1);
1221         yaffs_GrossUnlock(dev);
1222         return 0;
1223 }
1224
1225 /*
1226  * The VFS layer already does all the dentry stuff for rename.
1227  *
1228  * NB: POSIX says you can rename an object over an old object of the same name
1229  */
1230 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1231                         struct inode *new_dir, struct dentry *new_dentry)
1232 {
1233         yaffs_Device *dev;
1234         int retVal = YAFFS_FAIL;
1235         yaffs_Object *target;
1236
1237         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_rename\n"));
1238         dev = yaffs_InodeToObject(old_dir)->myDev;
1239
1240         yaffs_GrossLock(dev);
1241
1242         /* Check if the target is an existing directory that is not empty. */
1243         target =
1244             yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1245                                    new_dentry->d_name.name);
1246
1247
1248
1249         if (target &&
1250             target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1251             !list_empty(&target->variant.directoryVariant.children)) {
1252
1253                 T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n"));
1254
1255                 retVal = YAFFS_FAIL;
1256         } else {
1257
1258                 /* Now does unlinking internally using shadowing mechanism */
1259                 T(YAFFS_TRACE_OS, (KERN_DEBUG "calling yaffs_RenameObject\n"));
1260
1261                 retVal =
1262                     yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1263                                        old_dentry->d_name.name,
1264                                        yaffs_InodeToObject(new_dir),
1265                                        new_dentry->d_name.name);
1266
1267         }
1268         yaffs_GrossUnlock(dev);
1269
1270         if (retVal == YAFFS_OK) {
1271                 if(target) {
1272                         new_dentry->d_inode->i_nlink--;
1273                         mark_inode_dirty(new_dentry->d_inode);
1274                 }
1275
1276                 return 0;
1277         } else {
1278                 return -ENOTEMPTY;
1279         }
1280
1281 }
1282
1283 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1284 {
1285         struct inode *inode = dentry->d_inode;
1286         int error;
1287         yaffs_Device *dev;
1288
1289         T(YAFFS_TRACE_OS,
1290           (KERN_DEBUG "yaffs_setattr of object %d\n",
1291            yaffs_InodeToObject(inode)->objectId));
1292
1293         if ((error = inode_change_ok(inode, attr)) == 0) {
1294
1295                 dev = yaffs_InodeToObject(inode)->myDev;
1296                 yaffs_GrossLock(dev);
1297                 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1298                     YAFFS_OK) {
1299                         error = 0;
1300                 } else {
1301                         error = -EPERM;
1302                 }
1303                 yaffs_GrossUnlock(dev);
1304                 if (!error)
1305                         error = inode_setattr(inode, attr);
1306         }
1307         return error;
1308 }
1309
1310 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1311 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1312 {
1313         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1314         struct super_block *sb = dentry->d_sb;
1315 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1316 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1317 {
1318         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1319 #else
1320 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1321 {
1322         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1323 #endif
1324
1325         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_statfs\n"));
1326
1327         yaffs_GrossLock(dev);
1328
1329         buf->f_type = YAFFS_MAGIC;
1330         buf->f_bsize = sb->s_blocksize;
1331         buf->f_namelen = 255;
1332         if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1333
1334                 buf->f_blocks =
1335                     (dev->endBlock - dev->startBlock +
1336                      1) * dev->nChunksPerBlock / (sb->s_blocksize /
1337                                                   dev->nDataBytesPerChunk);
1338                 buf->f_bfree =
1339                     yaffs_GetNumberOfFreeChunks(dev) / (sb->s_blocksize /
1340                                                         dev->nDataBytesPerChunk);
1341         } else {
1342
1343                 buf->f_blocks =
1344                     (dev->endBlock - dev->startBlock +
1345                      1) * dev->nChunksPerBlock * (dev->nDataBytesPerChunk /
1346                                                   sb->s_blocksize);
1347                 buf->f_bfree =
1348                     yaffs_GetNumberOfFreeChunks(dev) * (dev->nDataBytesPerChunk /
1349                                                         sb->s_blocksize);
1350         }
1351         buf->f_files = 0;
1352         buf->f_ffree = 0;
1353         buf->f_bavail = buf->f_bfree;
1354
1355         yaffs_GrossUnlock(dev);
1356         return 0;
1357 }
1358
1359
1360 /**
1361 static int yaffs_do_sync_fs(struct super_block *sb)
1362 {
1363
1364         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1365         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_do_sync_fs\n"));
1366
1367         if(sb->s_dirt) {
1368                 yaffs_GrossLock(dev);
1369
1370                 if(dev)
1371                         yaffs_CheckpointSave(dev);
1372
1373                 yaffs_GrossUnlock(dev);
1374
1375                 sb->s_dirt = 0;
1376         }
1377         return 0;
1378 }
1379 **/
1380
1381 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1382 static void yaffs_write_super(struct super_block *sb)
1383 #else
1384 static int yaffs_write_super(struct super_block *sb)
1385 #endif
1386 {
1387
1388         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n"));
1389 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
1390         return 0; /* yaffs_do_sync_fs(sb);*/
1391 #endif
1392 }
1393
1394
1395 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1396 static int yaffs_sync_fs(struct super_block *sb, int wait)
1397 #else
1398 static int yaffs_sync_fs(struct super_block *sb)
1399 #endif
1400 {
1401
1402         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n"));
1403
1404         return 0; /* yaffs_do_sync_fs(sb);*/
1405
1406 }
1407
1408
1409 static void yaffs_read_inode(struct inode *inode)
1410 {
1411         /* NB This is called as a side effect of other functions, but
1412          * we had to release the lock to prevent deadlocks, so
1413          * need to lock again.
1414          */
1415
1416         yaffs_Object *obj;
1417         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1418
1419         T(YAFFS_TRACE_OS,
1420           (KERN_DEBUG "yaffs_read_inode for %d\n", (int)inode->i_ino));
1421
1422         yaffs_GrossLock(dev);
1423
1424         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1425
1426         yaffs_FillInodeFromObject(inode, obj);
1427
1428         yaffs_GrossUnlock(dev);
1429 }
1430
1431 static LIST_HEAD(yaffs_dev_list);
1432
1433 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1434 {
1435         yaffs_Device    *dev = yaffs_SuperToDevice(sb);
1436
1437         if( *flags & MS_RDONLY ) {
1438                 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1439
1440                 T(YAFFS_TRACE_OS,
1441                         (KERN_DEBUG "yaffs_remount_fs: %s: RO\n", dev->name ));
1442
1443                 yaffs_GrossLock(dev);
1444
1445                 yaffs_FlushEntireDeviceCache(dev);
1446
1447                 yaffs_CheckpointSave(dev);
1448
1449                 if (mtd->sync)
1450                         mtd->sync(mtd);
1451
1452                 yaffs_GrossUnlock(dev);
1453         }
1454         else {
1455                 T(YAFFS_TRACE_OS,
1456                         (KERN_DEBUG "yaffs_remount_fs: %s: RW\n", dev->name ));
1457         }
1458
1459         return 0;
1460 }
1461
1462 static void yaffs_put_super(struct super_block *sb)
1463 {
1464         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1465
1466         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_put_super\n"));
1467
1468         yaffs_GrossLock(dev);
1469
1470         yaffs_FlushEntireDeviceCache(dev);
1471
1472         yaffs_CheckpointSave(dev);
1473
1474         if (dev->putSuperFunc) {
1475                 dev->putSuperFunc(sb);
1476         }
1477
1478         yaffs_Deinitialise(dev);
1479
1480         yaffs_GrossUnlock(dev);
1481
1482         /* we assume this is protected by lock_kernel() in mount/umount */
1483         list_del(&dev->devList);
1484
1485         if(dev->spareBuffer){
1486                 YFREE(dev->spareBuffer);
1487                 dev->spareBuffer = NULL;
1488         }
1489
1490         kfree(dev);
1491 }
1492
1493
1494 static void yaffs_MTDPutSuper(struct super_block *sb)
1495 {
1496
1497         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1498
1499         if (mtd->sync) {
1500                 mtd->sync(mtd);
1501         }
1502
1503         put_mtd_device(mtd);
1504 }
1505
1506
1507 static void yaffs_MarkSuperBlockDirty(void *vsb)
1508 {
1509         struct super_block *sb = (struct super_block *)vsb;
1510
1511         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_MarkSuperBlockDirty() sb = %p\n",sb));
1512 //      if(sb)
1513 //              sb->s_dirt = 1;
1514 }
1515
1516 typedef struct {
1517         int inband_tags;
1518         int skip_checkpoint_read;
1519         int skip_checkpoint_write;
1520         int no_cache;
1521 } yaffs_options;
1522
1523 #define MAX_OPT_LEN 20
1524 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1525 {
1526         char cur_opt[MAX_OPT_LEN+1];
1527         int p;
1528         int error = 0;
1529
1530         /* Parse through the options which is a comma seperated list */
1531
1532         while(options_str && *options_str && !error){
1533                 memset(cur_opt,0,MAX_OPT_LEN+1);
1534                 p = 0;
1535
1536                 while(*options_str && *options_str != ','){
1537                         if(p < MAX_OPT_LEN){
1538                                 cur_opt[p] = *options_str;
1539                                 p++;
1540                         }
1541                         options_str++;
1542                 }
1543
1544                 if(!strcmp(cur_opt,"inband-tags"))
1545                         options->inband_tags = 1;
1546                 else if(!strcmp(cur_opt,"no-cache"))
1547                         options->no_cache = 1;
1548                 else if(!strcmp(cur_opt,"no-checkpoint-read"))
1549                         options->skip_checkpoint_read = 1;
1550                 else if(!strcmp(cur_opt,"no-checkpoint-write"))
1551                         options->skip_checkpoint_write = 1;
1552                 else if(!strcmp(cur_opt,"no-checkpoint")){
1553                         options->skip_checkpoint_read = 1;
1554                         options->skip_checkpoint_write = 1;
1555                 } else {
1556                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",cur_opt);
1557                         error = 1;
1558                 }
1559
1560         }
1561
1562         return error;
1563 }
1564
1565 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1566                                                      struct super_block *sb,
1567                                                      void *data, int silent)
1568 {
1569         int nBlocks;
1570         struct inode *inode = NULL;
1571         struct dentry *root;
1572         yaffs_Device *dev = 0;
1573         char devname_buf[BDEVNAME_SIZE + 1];
1574         struct mtd_info *mtd;
1575         int err;
1576         char *data_str = (char *)data;
1577
1578         yaffs_options options;
1579
1580         sb->s_magic = YAFFS_MAGIC;
1581         sb->s_op = &yaffs_super_ops;
1582
1583         if (!sb)
1584                 printk(KERN_INFO "yaffs: sb is NULL\n");
1585         else if (!sb->s_dev)
1586                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1587         else if (!yaffs_devname(sb, devname_buf))
1588                 printk(KERN_INFO "yaffs: devname is NULL\n");
1589         else
1590                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1591                        sb->s_dev,
1592                        yaffs_devname(sb, devname_buf));
1593
1594         if(!data_str)
1595                 data_str = "";
1596
1597         printk(KERN_INFO "yaffs: passed flags \"%s\"\n",data_str);
1598
1599         memset(&options,0,sizeof(options));
1600
1601         if(yaffs_parse_options(&options,data_str)){
1602                 /* Option parsing failed */
1603                 return NULL;
1604         }
1605
1606
1607         sb->s_blocksize = PAGE_CACHE_SIZE;
1608         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1609         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1610         T(YAFFS_TRACE_OS,
1611           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1612
1613 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1614         T(YAFFS_TRACE_OS,
1615           ("yaffs: Write verification disabled. All guarantees "
1616            "null and void\n"));
1617 #endif
1618
1619         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1620                                "\"%s\"\n",
1621                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
1622                                yaffs_devname(sb, devname_buf)));
1623
1624         /* Check it's an mtd device..... */
1625         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
1626                 return NULL;    /* This isn't an mtd device */
1627         }
1628         /* Get the device */
1629         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1630         if (!mtd) {
1631                 T(YAFFS_TRACE_ALWAYS,
1632                   ("yaffs: MTD device #%u doesn't appear to exist\n",
1633                    MINOR(sb->s_dev)));
1634                 return NULL;
1635         }
1636         /* Check it's NAND */
1637         if (mtd->type != MTD_NANDFLASH) {
1638                 T(YAFFS_TRACE_ALWAYS,
1639                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1640                 return NULL;
1641         }
1642
1643         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1644         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1645         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1646         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1647         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1648         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1649         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1650         T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1651         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1652         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1653         T(YAFFS_TRACE_OS, (" size %d\n", mtd->size));
1654
1655 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1656
1657         if (yaffsVersion == 1 &&
1658 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1659             mtd->writesize >= 2048) {
1660 #else
1661             mtd->oobblock >= 2048) {
1662 #endif
1663             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n"));
1664             yaffsVersion = 2;
1665         }
1666
1667         /* Added NCB 26/5/2006 for completeness */
1668         if (yaffsVersion == 2 &&
1669 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1670             mtd->writesize == 512) {
1671 #else
1672             mtd->oobblock == 512) {
1673 #endif
1674             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs1\n"));
1675             yaffsVersion = 1;
1676         }
1677
1678 #endif
1679
1680         if (yaffsVersion == 2) {
1681                 /* Check for version 2 style functions */
1682                 if (!mtd->erase ||
1683                     !mtd->block_isbad ||
1684                     !mtd->block_markbad ||
1685                     !mtd->read ||
1686                     !mtd->write ||
1687 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1688                     !mtd->read_oob || !mtd->write_oob) {
1689 #else
1690                     !mtd->write_ecc ||
1691                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1692 #endif
1693                         T(YAFFS_TRACE_ALWAYS,
1694                           ("yaffs: MTD device does not support required "
1695                            "functions\n"));;
1696                         return NULL;
1697                 }
1698
1699 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1700                 if (mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1701 #else
1702                 if (mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1703 #endif
1704                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) {
1705                         T(YAFFS_TRACE_ALWAYS,
1706                           ("yaffs: MTD device does not have the "
1707                            "right page sizes\n"));
1708                         return NULL;
1709                 }
1710         } else {
1711                 /* Check for V1 style functions */
1712                 if (!mtd->erase ||
1713                     !mtd->read ||
1714                     !mtd->write ||
1715 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1716                     !mtd->read_oob || !mtd->write_oob) {
1717 #else
1718                     !mtd->write_ecc ||
1719                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1720 #endif
1721                         T(YAFFS_TRACE_ALWAYS,
1722                           ("yaffs: MTD device does not support required "
1723                            "functions\n"));;
1724                         return NULL;
1725                 }
1726
1727                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
1728                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1729                         T(YAFFS_TRACE_ALWAYS,
1730                           ("yaffs: MTD device does not support have the "
1731                            "right page sizes\n"));
1732                         return NULL;
1733                 }
1734         }
1735
1736         /* OK, so if we got here, we have an MTD that's NAND and looks
1737          * like it has the right capabilities
1738          * Set the yaffs_Device up for mtd
1739          */
1740
1741 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1742         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1743 #else
1744         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1745 #endif
1746         if (!dev) {
1747                 /* Deep shit could not allocate device structure */
1748                 T(YAFFS_TRACE_ALWAYS,
1749                   ("yaffs_read_super: Failed trying to allocate "
1750                    "yaffs_Device. \n"));
1751                 return NULL;
1752         }
1753
1754         memset(dev, 0, sizeof(yaffs_Device));
1755         dev->genericDevice = mtd;
1756         dev->name = mtd->name;
1757
1758         /* Set up the memory size parameters.... */
1759
1760         nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1761         dev->startBlock = 0;
1762         dev->endBlock = nBlocks - 1;
1763         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1764         dev->nDataBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1765         dev->nReservedBlocks = 5;
1766         dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
1767
1768         /* ... and the functions. */
1769         if (yaffsVersion == 2) {
1770                 dev->writeChunkWithTagsToNAND =
1771                     nandmtd2_WriteChunkWithTagsToNAND;
1772                 dev->readChunkWithTagsFromNAND =
1773                     nandmtd2_ReadChunkWithTagsFromNAND;
1774                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1775                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1776                 dev->spareBuffer = YMALLOC(mtd->oobsize);
1777                 dev->isYaffs2 = 1;
1778 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1779                 dev->nDataBytesPerChunk = mtd->writesize;
1780                 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
1781 #else
1782                 dev->nDataBytesPerChunk = mtd->oobblock;
1783                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1784 #endif
1785                 nBlocks = mtd->size / mtd->erasesize;
1786
1787                 dev->nCheckpointReservedBlocks = CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS;
1788                 dev->startBlock = 0;
1789                 dev->endBlock = nBlocks - 1;
1790         } else {
1791 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1792                 /* use the MTD interface in yaffs_mtdif1.c */
1793                 dev->writeChunkWithTagsToNAND =
1794                         nandmtd1_WriteChunkWithTagsToNAND;
1795                 dev->readChunkWithTagsFromNAND =
1796                         nandmtd1_ReadChunkWithTagsFromNAND;
1797                 dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
1798                 dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
1799 #else
1800                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1801                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1802 #endif
1803                 dev->isYaffs2 = 0;
1804         }
1805         /* ... and common functions */
1806         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1807         dev->initialiseNAND = nandmtd_InitialiseNAND;
1808
1809         dev->putSuperFunc = yaffs_MTDPutSuper;
1810
1811         dev->superBlock = (void *)sb;
1812         dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
1813
1814
1815 #ifndef CONFIG_YAFFS_DOES_ECC
1816         dev->useNANDECC = 1;
1817 #endif
1818
1819 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
1820         dev->wideTnodesDisabled = 1;
1821 #endif
1822
1823         dev->skipCheckpointRead = options.skip_checkpoint_read;
1824         dev->skipCheckpointWrite = options.skip_checkpoint_write;
1825
1826         /* we assume this is protected by lock_kernel() in mount/umount */
1827         list_add_tail(&dev->devList, &yaffs_dev_list);
1828
1829         init_MUTEX(&dev->grossLock);
1830
1831         yaffs_GrossLock(dev);
1832
1833         err = yaffs_GutsInitialise(dev);
1834
1835         T(YAFFS_TRACE_OS,
1836           ("yaffs_read_super: guts initialised %s\n",
1837            (err == YAFFS_OK) ? "OK" : "FAILED"));
1838
1839         /* Release lock before yaffs_get_inode() */
1840         yaffs_GrossUnlock(dev);
1841
1842         /* Create root inode */
1843         if (err == YAFFS_OK)
1844                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
1845                                         yaffs_Root(dev));
1846
1847         if (!inode)
1848                 return NULL;
1849
1850         inode->i_op = &yaffs_dir_inode_operations;
1851         inode->i_fop = &yaffs_dir_operations;
1852
1853         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
1854
1855         root = d_alloc_root(inode);
1856
1857         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
1858
1859         if (!root) {
1860                 iput(inode);
1861                 return NULL;
1862         }
1863         sb->s_root = root;
1864
1865         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
1866         return sb;
1867 }
1868
1869
1870 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1871 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
1872                                          int silent)
1873 {
1874         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
1875 }
1876
1877 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1878 static int yaffs_read_super(struct file_system_type *fs,
1879                             int flags, const char *dev_name,
1880                             void *data, struct vfsmount *mnt)
1881 {
1882
1883         return get_sb_bdev(fs, flags, dev_name, data,
1884                            yaffs_internal_read_super_mtd, mnt);
1885 }
1886 #else
1887 static struct super_block *yaffs_read_super(struct file_system_type *fs,
1888                                             int flags, const char *dev_name,
1889                                             void *data)
1890 {
1891
1892         return get_sb_bdev(fs, flags, dev_name, data,
1893                            yaffs_internal_read_super_mtd);
1894 }
1895 #endif
1896
1897 static struct file_system_type yaffs_fs_type = {
1898         .owner = THIS_MODULE,
1899         .name = "yaffs",
1900         .get_sb = yaffs_read_super,
1901         .kill_sb = kill_block_super,
1902         .fs_flags = FS_REQUIRES_DEV,
1903 };
1904 #else
1905 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
1906                                             int silent)
1907 {
1908         return yaffs_internal_read_super(1, sb, data, silent);
1909 }
1910
1911 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
1912                       FS_REQUIRES_DEV);
1913 #endif
1914
1915
1916 #ifdef CONFIG_YAFFS_YAFFS2
1917
1918 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1919 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
1920                                           int silent)
1921 {
1922         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
1923 }
1924
1925 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1926 static int yaffs2_read_super(struct file_system_type *fs,
1927                         int flags, const char *dev_name, void *data,
1928                         struct vfsmount *mnt)
1929 {
1930         return get_sb_bdev(fs, flags, dev_name, data,
1931                         yaffs2_internal_read_super_mtd, mnt);
1932 }
1933 #else
1934 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
1935                                              int flags, const char *dev_name,
1936                                              void *data)
1937 {
1938
1939         return get_sb_bdev(fs, flags, dev_name, data,
1940                            yaffs2_internal_read_super_mtd);
1941 }
1942 #endif
1943
1944 static struct file_system_type yaffs2_fs_type = {
1945         .owner = THIS_MODULE,
1946         .name = "yaffs2",
1947         .get_sb = yaffs2_read_super,
1948         .kill_sb = kill_block_super,
1949         .fs_flags = FS_REQUIRES_DEV,
1950 };
1951 #else
1952 static struct super_block *yaffs2_read_super(struct super_block *sb,
1953                                              void *data, int silent)
1954 {
1955         return yaffs_internal_read_super(2, sb, data, silent);
1956 }
1957
1958 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
1959                       FS_REQUIRES_DEV);
1960 #endif
1961
1962 #endif                          /* CONFIG_YAFFS_YAFFS2 */
1963
1964 static struct proc_dir_entry *my_proc_entry;
1965
1966 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
1967 {
1968         buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
1969         buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
1970         buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
1971         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
1972         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
1973         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
1974         buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
1975         buf += sprintf(buf, "nCheckptResBlocks.. %d\n", dev->nCheckpointReservedBlocks);
1976         buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
1977         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
1978         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
1979         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
1980         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
1981         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
1982         buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
1983         buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
1984         buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
1985         buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
1986         buf +=
1987             sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
1988         buf +=
1989             sprintf(buf, "passiveGCs......... %d\n",
1990                     dev->passiveGarbageCollections);
1991         buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
1992         buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
1993         buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
1994         buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
1995         buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
1996         buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
1997         buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
1998         buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
1999         buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
2000         buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
2001         buf +=
2002             sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
2003         buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
2004         buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
2005
2006         return buf;
2007 }
2008
2009 static int yaffs_proc_read(char *page,
2010                            char **start,
2011                            off_t offset, int count, int *eof, void *data)
2012 {
2013         struct list_head *item;
2014         char *buf = page;
2015         int step = offset;
2016         int n = 0;
2017
2018         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2019          * We use 'offset' (*ppos) to indicate where we are in devList.
2020          * This also assumes the user has posted a read buffer large
2021          * enough to hold the complete output; but that's life in /proc.
2022          */
2023
2024         *(int *)start = 1;
2025
2026         /* Print header first */
2027         if (step == 0) {
2028                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2029                                "\n%s\n%s\n", yaffs_fs_c_version,
2030                                yaffs_guts_c_version);
2031         }
2032
2033         /* hold lock_kernel while traversing yaffs_dev_list */
2034         lock_kernel();
2035
2036         /* Locate and print the Nth entry.  Order N-squared but N is small. */
2037         list_for_each(item, &yaffs_dev_list) {
2038                 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
2039                 if (n < step) {
2040                         n++;
2041                         continue;
2042                 }
2043                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2044                 buf = yaffs_dump_dev(buf, dev);
2045                 break;
2046         }
2047         unlock_kernel();
2048
2049         return buf - page < count ? buf - page : count;
2050 }
2051
2052 /**
2053  * Set the verbosity of the warnings and error messages.
2054  *
2055  * Note that the names can only be a..z or _ with the current code.
2056  */
2057
2058 static struct {
2059         char *mask_name;
2060         unsigned mask_bitfield;
2061 } mask_flags[] = {
2062         {"allocate", YAFFS_TRACE_ALLOCATE},
2063         {"always", YAFFS_TRACE_ALWAYS},
2064         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2065         {"buffers", YAFFS_TRACE_BUFFERS},
2066         {"bug", YAFFS_TRACE_BUG},
2067         {"checkpt", YAFFS_TRACE_CHECKPOINT},
2068         {"deletion", YAFFS_TRACE_DELETION},
2069         {"erase", YAFFS_TRACE_ERASE},
2070         {"error", YAFFS_TRACE_ERROR},
2071         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2072         {"gc", YAFFS_TRACE_GC},
2073         {"mtd", YAFFS_TRACE_MTD},
2074         {"nandaccess", YAFFS_TRACE_NANDACCESS},
2075         {"os", YAFFS_TRACE_OS},
2076         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2077         {"scan", YAFFS_TRACE_SCAN},
2078         {"tracing", YAFFS_TRACE_TRACING},
2079
2080         {"verify", YAFFS_TRACE_VERIFY},
2081         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2082         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2083         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2084
2085         {"write", YAFFS_TRACE_WRITE},
2086         {"all", 0xffffffff},
2087         {"none", 0},
2088         {NULL, 0},
2089 };
2090
2091 #define MAX_MASK_NAME_LENGTH 40
2092 static int yaffs_proc_write(struct file *file, const char *buf,
2093                                          unsigned long count, void *data)
2094 {
2095         unsigned rg = 0, mask_bitfield;
2096         char *end;
2097         char *mask_name;
2098         char *x;
2099         char substring[MAX_MASK_NAME_LENGTH+1];
2100         int i;
2101         int done = 0;
2102         int add, len = 0;
2103         int pos = 0;
2104
2105         rg = yaffs_traceMask;
2106
2107         while (!done && (pos < count)) {
2108                 done = 1;
2109                 while ((pos < count) && isspace(buf[pos])) {
2110                         pos++;
2111                 }
2112
2113                 switch (buf[pos]) {
2114                 case '+':
2115                 case '-':
2116                 case '=':
2117                         add = buf[pos];
2118                         pos++;
2119                         break;
2120
2121                 default:
2122                         add = ' ';
2123                         break;
2124                 }
2125                 mask_name = NULL;
2126
2127                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2128                 if (end > buf + pos) {
2129                         mask_name = "numeral";
2130                         len = end - (buf + pos);
2131                         done = 0;
2132                 } else {
2133                         for(x = buf + pos, i = 0;
2134                             (*x == '_' || (*x >='a' && *x <= 'z')) &&
2135                             i <MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2136                             substring[i] = *x;
2137                         substring[i] = '\0';
2138
2139                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2140                                 //len = strlen(mask_flags[i].mask_name);
2141                                 //if (strncmp(buf + pos, mask_flags[i].mask_name, len) == 0) {
2142                                 if(strcmp(substring,mask_flags[i].mask_name) == 0){
2143                                         mask_name = mask_flags[i].mask_name;
2144                                         mask_bitfield = mask_flags[i].mask_bitfield;
2145                                         done = 0;
2146                                         break;
2147                                 }
2148                         }
2149                 }
2150
2151                 if (mask_name != NULL) {
2152                         // pos += len;
2153                         done = 0;
2154                         switch(add) {
2155                         case '-':
2156                                 rg &= ~mask_bitfield;
2157                                 break;
2158                         case '+':
2159                                 rg |= mask_bitfield;
2160                                 break;
2161                         case '=':
2162                                 rg = mask_bitfield;
2163                                 break;
2164                         default:
2165                                 rg |= mask_bitfield;
2166                                 break;
2167                         }
2168                 }
2169         }
2170
2171         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2172
2173         printk("new trace = 0x%08X\n",yaffs_traceMask);
2174
2175         if (rg & YAFFS_TRACE_ALWAYS) {
2176                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2177                         char flag;
2178                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2179                         printk("%c%s\n", flag, mask_flags[i].mask_name);
2180                 }
2181         }
2182
2183         return count;
2184 }
2185
2186 /* Stuff to handle installation of file systems */
2187 struct file_system_to_install {
2188         struct file_system_type *fst;
2189         int installed;
2190 };
2191
2192 static struct file_system_to_install fs_to_install[] = {
2193 //#ifdef CONFIG_YAFFS_YAFFS1
2194         {&yaffs_fs_type, 0},
2195 //#endif
2196 //#ifdef CONFIG_YAFFS_YAFFS2
2197         {&yaffs2_fs_type, 0},
2198 //#endif
2199         {NULL, 0}
2200 };
2201
2202 static int __init init_yaffs_fs(void)
2203 {
2204         int error = 0;
2205         struct file_system_to_install *fsinst;
2206
2207         T(YAFFS_TRACE_ALWAYS,
2208           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2209
2210         /* Install the proc_fs entry */
2211         my_proc_entry = create_proc_entry("yaffs",
2212                                                S_IRUGO | S_IFREG,
2213                                                &proc_root);
2214
2215         if (my_proc_entry) {
2216                 my_proc_entry->write_proc = yaffs_proc_write;
2217                 my_proc_entry->read_proc = yaffs_proc_read;
2218                 my_proc_entry->data = NULL;
2219         } else {
2220                 return -ENOMEM;
2221         }
2222
2223         /* Now add the file system entries */
2224
2225         fsinst = fs_to_install;
2226
2227         while (fsinst->fst && !error) {
2228                 error = register_filesystem(fsinst->fst);
2229                 if (!error) {
2230                         fsinst->installed = 1;
2231                 }
2232                 fsinst++;
2233         }
2234
2235         /* Any errors? uninstall  */
2236         if (error) {
2237                 fsinst = fs_to_install;
2238
2239                 while (fsinst->fst) {
2240                         if (fsinst->installed) {
2241                                 unregister_filesystem(fsinst->fst);
2242                                 fsinst->installed = 0;
2243                         }
2244                         fsinst++;
2245                 }
2246         }
2247
2248         return error;
2249 }
2250
2251 static void __exit exit_yaffs_fs(void)
2252 {
2253
2254         struct file_system_to_install *fsinst;
2255
2256         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2257                                " removing. \n"));
2258
2259         remove_proc_entry("yaffs", &proc_root);
2260
2261         fsinst = fs_to_install;
2262
2263         while (fsinst->fst) {
2264                 if (fsinst->installed) {
2265                         unregister_filesystem(fsinst->fst);
2266                         fsinst->installed = 0;
2267                 }
2268                 fsinst++;
2269         }
2270
2271 }
2272
2273 module_init(init_yaffs_fs)
2274 module_exit(exit_yaffs_fs)
2275
2276 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2277 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2278 MODULE_LICENSE("GPL");