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 1.75 2009-03-05 01:45:28 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/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 #include "asm/div64.h"
  56
  57 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  58
  59 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  60 #include <asm/statfs.h>
  61 #define UnlockPage(p) unlock_page(p)
  62 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  63
  64 /* FIXME: use sb->s_id instead ? */
  65 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)
  66
  67 #else
  68
  69 #include <linux/locks.h>
  70 #define BDEVNAME_SIZE           0
  71 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
  72
  73 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  74 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
  75 #define __user
  76 #endif
  77
  78 #endif
  79
  80 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
  81 #define YPROC_ROOT  &proc_root
  82 #else
  83 #define YPROC_ROOT  NULL
  84 #endif
  85
  86 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  87 #define WRITE_SIZE_STR "writesize"
  88 #define WRITE_SIZE(mtd) (mtd)->writesize
  89 #else
  90 #define WRITE_SIZE_STR "oobblock"
  91 #define WRITE_SIZE(mtd) (mtd)->oobblock
  92 #endif
  93
  94 #if(LINUX_VERSION_CODE > KERNEL_VERSION(2,6,27))
  95 #define YAFFS_USE_WRITE_BEGIN_END 1
  96 #else
  97 #define YAFFS_USE_WRITE_BEGIN_END 0
  98 #endif
  99
 100 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28))
 101 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
 102 {
 103         uint64_t result = partition_size;
 104         do_div(result,block_size);
 105         return (uint32_t)result;
 106 }
 107 #else
 108 #define YCALCBLOCKS(s,b) ((s)/(b))
 109 #endif
 110
 111 #include <asm/uaccess.h>
 112
 113 #include "yportenv.h"
 114 #include "yaffs_guts.h"
 115
 116 #include <linux/mtd/mtd.h>
 117 #include "yaffs_mtdif.h"
 118 #include "yaffs_mtdif1.h"
 119 #include "yaffs_mtdif2.h"
 120
 121 unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
 122 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
 123 unsigned int yaffs_auto_checkpoint = 1;
 124
 125 /* Module Parameters */
 126 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 127 module_param(yaffs_traceMask,uint,0644);
 128 module_param(yaffs_wr_attempts,uint,0644);
 129 module_param(yaffs_auto_checkpoint,uint,0644);
 130 #else
 131 MODULE_PARM(yaffs_traceMask,"i");
 132 MODULE_PARM(yaffs_wr_attempts,"i");
 133 MODULE_PARM(yaffs_auto_checkpoint,"i");
 134 #endif
 135
 136 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
 137 /* use iget and read_inode */
 138 #define Y_IGET(sb,inum) iget((sb),(inum))
 139 static void yaffs_read_inode(struct inode *inode);
 140
 141 #else
 142 /* Call local equivalent */
 143 #define YAFFS_USE_OWN_IGET
 144 #define Y_IGET(sb,inum) yaffs_iget((sb),(inum))
 145
 146 static struct inode * yaffs_iget(struct super_block *sb, unsigned long ino);
 147 #endif
 148
 149 /*#define T(x) printk x */
 150
 151 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 152 #define yaffs_InodeToObjectLV(iptr) (iptr)->i_private
 153 #else
 154 #define yaffs_InodeToObjectLV(iptr) (iptr)->u.generic_ip
 155 #endif
 156
 157 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
 158 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
 159
 160 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 161 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
 162 #else
 163 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 164 #endif
 165
 166 static void yaffs_put_super(struct super_block *sb);
 167
 168 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 169                                 loff_t * pos);
 170 static ssize_t yaffs_hold_space(struct file *f);
 171 static void yaffs_release_space(struct file *f);
 172
 173 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 174 static int yaffs_file_flush(struct file *file, fl_owner_t id);
 175 #else
 176 static int yaffs_file_flush(struct file *file);
 177 #endif
 178
 179 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 180                              int datasync);
 181
 182 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 183
 184 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 185 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 186                         struct nameidata *n);
 187 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 188                                    struct nameidata *n);
 189 #else
 190 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 191 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 192 #endif
 193 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 194                       struct dentry *dentry);
 195 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 196 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 197                          const char *symname);
 198 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 199
 200 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 201 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 202                        dev_t dev);
 203 #else
 204 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 205                        int dev);
 206 #endif
 207 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 208                         struct inode *new_dir, struct dentry *new_dentry);
 209 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 210
 211 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 212 static int yaffs_sync_fs(struct super_block *sb, int wait);
 213 static void yaffs_write_super(struct super_block *sb);
 214 #else
 215 static int yaffs_sync_fs(struct super_block *sb);
 216 static int yaffs_write_super(struct super_block *sb);
 217 #endif
 218
 219 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 220 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
 221 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 222 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 223 #else
 224 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 225 #endif
 226
 227 #ifdef YAFFS_HAS_PUT_INODE
 228 static void yaffs_put_inode(struct inode *inode);
 229 #endif
 230
 231 static void yaffs_delete_inode(struct inode *);
 232 static void yaffs_clear_inode(struct inode *);
 233
 234 static int yaffs_readpage(struct file *file, struct page *page);
 235 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 236 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 237 #else
 238 static int yaffs_writepage(struct page *page);
 239 #endif
 240
 241
 242 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
 243 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 244                              loff_t pos, unsigned len, unsigned flags,
 245                           struct page **pagep, void **fsdata);
 246 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 247                            loff_t pos, unsigned len, unsigned copied,
 248                            struct page *pg, void *fsdadata);
 249 #else
 250 static int yaffs_prepare_write(struct file *f, struct page *pg,
 251                                unsigned offset, unsigned to);
 252 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 253                               unsigned to);
 254
 255 #endif
 256
 257 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 258                           int buflen);
 259 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 260 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 261 #else
 262 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 263 #endif
 264
 265 static struct address_space_operations yaffs_file_address_operations = {
 266         .readpage = yaffs_readpage,
 267         .writepage = yaffs_writepage,
 268 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 269         .write_begin = yaffs_write_begin,
 270         .write_end = yaffs_write_end,
 271 #else
 272         .prepare_write = yaffs_prepare_write,
 273         .commit_write = yaffs_commit_write,
 274 #endif
 275 };
 276
 277 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,22))
 278 static struct file_operations yaffs_file_operations = {
 279         .read = do_sync_read,
 280         .write = do_sync_write,
 281         .aio_read = generic_file_aio_read,
 282         .aio_write = generic_file_aio_write,
 283         .mmap = generic_file_mmap,
 284         .flush = yaffs_file_flush,
 285         .fsync = yaffs_sync_object,
 286         .splice_read = generic_file_splice_read,
 287         .splice_write = generic_file_splice_write,
 288         .llseek = generic_file_llseek,
 289 };
 290
 291 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 292
 293 static struct file_operations yaffs_file_operations = {
 294         .read = do_sync_read,
 295         .write = do_sync_write,
 296         .aio_read = generic_file_aio_read,
 297         .aio_write = generic_file_aio_write,
 298         .mmap = generic_file_mmap,
 299         .flush = yaffs_file_flush,
 300         .fsync = yaffs_sync_object,
 301         .sendfile = generic_file_sendfile,
 302 };
 303
 304 #else
 305
 306 static struct file_operations yaffs_file_operations = {
 307         .read = generic_file_read,
 308         .write = generic_file_write,
 309         .mmap = generic_file_mmap,
 310         .flush = yaffs_file_flush,
 311         .fsync = yaffs_sync_object,
 312 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 313         .sendfile = generic_file_sendfile,
 314 #endif
 315 };
 316 #endif
 317
 318 static struct inode_operations yaffs_file_inode_operations = {
 319         .setattr = yaffs_setattr,
 320 };
 321
 322 static struct inode_operations yaffs_symlink_inode_operations = {
 323         .readlink = yaffs_readlink,
 324         .follow_link = yaffs_follow_link,
 325         .setattr = yaffs_setattr,
 326 };
 327
 328 static struct inode_operations yaffs_dir_inode_operations = {
 329         .create = yaffs_create,
 330         .lookup = yaffs_lookup,
 331         .link = yaffs_link,
 332         .unlink = yaffs_unlink,
 333         .symlink = yaffs_symlink,
 334         .mkdir = yaffs_mkdir,
 335         .rmdir = yaffs_unlink,
 336         .mknod = yaffs_mknod,
 337         .rename = yaffs_rename,
 338         .setattr = yaffs_setattr,
 339 };
 340
 341 static struct file_operations yaffs_dir_operations = {
 342         .read = generic_read_dir,
 343         .readdir = yaffs_readdir,
 344         .fsync = yaffs_sync_object,
 345 };
 346
 347 static struct super_operations yaffs_super_ops = {
 348         .statfs = yaffs_statfs,
 349
 350 #ifndef YAFFS_USE_OWN_IGET
 351         .read_inode = yaffs_read_inode,
 352 #endif
 353 #ifdef YAFFS_HAS_PUT_INODE
 354         .put_inode = yaffs_put_inode,
 355 #endif
 356         .put_super = yaffs_put_super,
 357         .delete_inode = yaffs_delete_inode,
 358         .clear_inode = yaffs_clear_inode,
 359         .sync_fs = yaffs_sync_fs,
 360         .write_super = yaffs_write_super,
 361 };
 362
 363 static void yaffs_GrossLock(yaffs_Device * dev)
 364 {
 365         T(YAFFS_TRACE_OS, ( "yaffs locking %p\n",current));
 366
 367         down(&dev->grossLock);
 368         T(YAFFS_TRACE_OS, ( "yaffs locked %p\n",current));
 369
 370 }
 371
 372 static void yaffs_GrossUnlock(yaffs_Device * dev)
 373 {
 374         T(YAFFS_TRACE_OS, ( "yaffs unlocking %p\n",current));
 375         up(&dev->grossLock);
 376
 377 }
 378
 379 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 380                           int buflen)
 381 {
 382         unsigned char *alias;
 383         int ret;
 384
 385         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 386
 387         yaffs_GrossLock(dev);
 388
 389         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 390
 391         yaffs_GrossUnlock(dev);
 392
 393         if (!alias)
 394                 return -ENOMEM;
 395
 396         ret = vfs_readlink(dentry, buffer, buflen, alias);
 397         kfree(alias);
 398         return ret;
 399 }
 400
 401 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 402 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 403 #else
 404 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 405 #endif
 406 {
 407         unsigned char *alias;
 408         int ret;
 409         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 410
 411         yaffs_GrossLock(dev);
 412
 413         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 414
 415         yaffs_GrossUnlock(dev);
 416
 417         if (!alias)
 418         {
 419                 ret = -ENOMEM;
 420                 goto out;
 421         }
 422
 423         ret = vfs_follow_link(nd, alias);
 424         kfree(alias);
 425 out:
 426 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 427         return ERR_PTR (ret);
 428 #else
 429         return ret;
 430 #endif
 431 }
 432
 433 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 434                               yaffs_Object * obj);
 435
 436 /*
 437  * Lookup is used to find objects in the fs
 438  */
 439 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 440
 441 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 442                                    struct nameidata *n)
 443 #else
 444 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 445 #endif
 446 {
 447         yaffs_Object *obj;
 448         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 449
 450         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 451
 452         yaffs_GrossLock(dev);
 453
 454         T(YAFFS_TRACE_OS,
 455           ( "yaffs_lookup for %d:%s\n",
 456            yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 457
 458         obj =
 459             yaffs_FindObjectByName(yaffs_InodeToObject(dir),
 460                                    dentry->d_name.name);
 461
 462         obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
 463
 464         /* Can't hold gross lock when calling yaffs_get_inode() */
 465         yaffs_GrossUnlock(dev);
 466
 467         if (obj) {
 468                 T(YAFFS_TRACE_OS,
 469                   ( "yaffs_lookup found %d\n", obj->objectId));
 470
 471                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 472
 473                 if (inode) {
 474                         T(YAFFS_TRACE_OS,
 475                           ( "yaffs_loookup dentry \n"));
 476 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 477  * d_add even if NULL inode */
 478 #if 0
 479                         /*dget(dentry); // try to solve directory bug */
 480                         d_add(dentry, inode);
 481
 482                         /* return dentry; */
 483                         return NULL;
 484 #endif
 485                 }
 486
 487         } else {
 488                 T(YAFFS_TRACE_OS, ( "yaffs_lookup not found\n"));
 489
 490         }
 491
 492 /* added NCB for 2.5/6 compatability - forces add even if inode is
 493  * NULL which creates dentry hash */
 494         d_add(dentry, inode);
 495
 496         return NULL;
 497         /*      return (ERR_PTR(-EIO)); */
 498
 499 }
 500
 501
 502 #ifdef YAFFS_HAS_PUT_INODE
 503
 504 /* For now put inode is just for debugging
 505  * Put inode is called when the inode **structure** is put.
 506  */
 507 static void yaffs_put_inode(struct inode *inode)
 508 {
 509         T(YAFFS_TRACE_OS,
 510           ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 511            atomic_read(&inode->i_count)));
 512
 513 }
 514 #endif
 515
 516 /* clear is called to tell the fs to release any per-inode data it holds */
 517 static void yaffs_clear_inode(struct inode *inode)
 518 {
 519         yaffs_Object *obj;
 520         yaffs_Device *dev;
 521
 522         obj = yaffs_InodeToObject(inode);
 523
 524         T(YAFFS_TRACE_OS,
 525           ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 526            atomic_read(&inode->i_count),
 527            obj ? "object exists" : "null object"));
 528
 529         if (obj) {
 530                 dev = obj->myDev;
 531                 yaffs_GrossLock(dev);
 532
 533                 /* Clear the association between the inode and
 534                  * the yaffs_Object.
 535                  */
 536                 obj->myInode = NULL;
 537                 yaffs_InodeToObjectLV(inode) = NULL;
 538
 539                 /* If the object freeing was deferred, then the real
 540                  * free happens now.
 541                  * This should fix the inode inconsistency problem.
 542                  */
 543
 544                 yaffs_HandleDeferedFree(obj);
 545
 546                 yaffs_GrossUnlock(dev);
 547         }
 548
 549 }
 550
 551 /* delete is called when the link count is zero and the inode
 552  * is put (ie. nobody wants to know about it anymore, time to
 553  * delete the file).
 554  * NB Must call clear_inode()
 555  */
 556 static void yaffs_delete_inode(struct inode *inode)
 557 {
 558         yaffs_Object *obj = yaffs_InodeToObject(inode);
 559         yaffs_Device *dev;
 560
 561         T(YAFFS_TRACE_OS,
 562           ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 563            atomic_read(&inode->i_count),
 564            obj ? "object exists" : "null object"));
 565
 566         if (obj) {
 567                 dev = obj->myDev;
 568                 yaffs_GrossLock(dev);
 569                 yaffs_DeleteObject(obj);
 570                 yaffs_GrossUnlock(dev);
 571         }
 572 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 573         truncate_inode_pages (&inode->i_data, 0);
 574 #endif
 575         clear_inode(inode);
 576 }
 577
 578 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 579 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 580 #else
 581 static int yaffs_file_flush(struct file *file)
 582 #endif
 583 {
 584         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 585
 586         yaffs_Device *dev = obj->myDev;
 587
 588         T(YAFFS_TRACE_OS,
 589           ( "yaffs_file_flush object %d (%s)\n", obj->objectId,
 590            obj->dirty ? "dirty" : "clean"));
 591
 592         yaffs_GrossLock(dev);
 593
 594         yaffs_FlushFile(obj, 1);
 595
 596         yaffs_GrossUnlock(dev);
 597
 598         return 0;
 599 }
 600
 601 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 602 {
 603         /* Lifted from jffs2 */
 604
 605         yaffs_Object *obj;
 606         unsigned char *pg_buf;
 607         int ret;
 608
 609         yaffs_Device *dev;
 610
 611         T(YAFFS_TRACE_OS, ( "yaffs_readpage at %08x, size %08x\n",
 612                            (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 613                            (unsigned)PAGE_CACHE_SIZE));
 614
 615         obj = yaffs_DentryToObject(f->f_dentry);
 616
 617         dev = obj->myDev;
 618
 619 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 620         BUG_ON(!PageLocked(pg));
 621 #else
 622         if (!PageLocked(pg))
 623                 PAGE_BUG(pg);
 624 #endif
 625
 626         pg_buf = kmap(pg);
 627         /* FIXME: Can kmap fail? */
 628
 629         yaffs_GrossLock(dev);
 630
 631         ret =
 632             yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT,
 633                                    PAGE_CACHE_SIZE);
 634
 635         yaffs_GrossUnlock(dev);
 636
 637         if (ret >= 0)
 638                 ret = 0;
 639
 640         if (ret) {
 641                 ClearPageUptodate(pg);
 642                 SetPageError(pg);
 643         } else {
 644                 SetPageUptodate(pg);
 645                 ClearPageError(pg);
 646         }
 647
 648         flush_dcache_page(pg);
 649         kunmap(pg);
 650
 651         T(YAFFS_TRACE_OS, ( "yaffs_readpage done\n"));
 652         return ret;
 653 }
 654
 655 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 656 {
 657         int ret = yaffs_readpage_nolock(f, pg);
 658         UnlockPage(pg);
 659         return ret;
 660 }
 661
 662 static int yaffs_readpage(struct file *f, struct page *pg)
 663 {
 664         return yaffs_readpage_unlock(f, pg);
 665 }
 666
 667 /* writepage inspired by/stolen from smbfs */
 668
 669 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 670 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 671 #else
 672 static int yaffs_writepage(struct page *page)
 673 #endif
 674 {
 675         struct address_space *mapping = page->mapping;
 676         loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
 677         struct inode *inode;
 678         unsigned long end_index;
 679         char *buffer;
 680         yaffs_Object *obj;
 681         int nWritten = 0;
 682         unsigned nBytes;
 683
 684         if (!mapping)
 685                 BUG();
 686         inode = mapping->host;
 687         if (!inode)
 688                 BUG();
 689
 690         if (offset > inode->i_size) {
 691                 T(YAFFS_TRACE_OS,
 692                   (
 693                    "yaffs_writepage at %08x, inode size = %08x!!!\n",
 694                    (unsigned)(page->index << PAGE_CACHE_SHIFT),
 695                    (unsigned)inode->i_size));
 696                 T(YAFFS_TRACE_OS,
 697                   ( "                -> don't care!!\n"));
 698                 unlock_page(page);
 699                 return 0;
 700         }
 701
 702         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 703
 704         /* easy case */
 705         if (page->index < end_index) {
 706                 nBytes = PAGE_CACHE_SIZE;
 707         } else {
 708                 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
 709         }
 710
 711         get_page(page);
 712
 713         buffer = kmap(page);
 714
 715         obj = yaffs_InodeToObject(inode);
 716         yaffs_GrossLock(obj->myDev);
 717
 718         T(YAFFS_TRACE_OS,
 719           ( "yaffs_writepage at %08x, size %08x\n",
 720            (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 721         T(YAFFS_TRACE_OS,
 722           ( "writepag0: obj = %05x, ino = %05x\n",
 723            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 724
 725         nWritten =
 726             yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT,
 727                                   nBytes, 0);
 728
 729         T(YAFFS_TRACE_OS,
 730           ( "writepag1: obj = %05x, ino = %05x\n",
 731            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 732
 733         yaffs_GrossUnlock(obj->myDev);
 734
 735         kunmap(page);
 736         SetPageUptodate(page);
 737         UnlockPage(page);
 738         put_page(page);
 739
 740         return (nWritten == nBytes) ? 0 : -ENOSPC;
 741 }
 742
 743
 744 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 745 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 746                              loff_t pos, unsigned len, unsigned flags,
 747                           struct page **pagep, void **fsdata)
 748
 749 {
 750         struct page *pg = NULL;
 751         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
 752         uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
 753         uint32_t to = offset + len;
 754
 755         int ret = 0;
 756         int space_held = 0;
 757
 758         T(YAFFS_TRACE_OS, ( "start yaffs_write_begin\n"));
 759         /* Get a page */
 760 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
 761         pg = grab_cache_page_write_begin(mapping,index,flags);
 762 #else
 763         pg = __grab_cache_page(mapping,index);
 764 #endif
 765
 766         *pagep = pg;
 767         if(!pg){
 768                 ret =  -ENOMEM;
 769                 goto out;
 770         }
 771         /* Get fs space */
 772         space_held = yaffs_hold_space(filp);
 773
 774         if(!space_held){
 775                 ret = -ENOSPC;
 776                 goto out;
 777         }
 778
 779         /* Update page if required */
 780
 781         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 782                 ret = yaffs_readpage_nolock(filp, pg);
 783
 784         if(ret)
 785                 goto out;
 786
 787         /* Happy path return */
 788         T(YAFFS_TRACE_OS, ( "end yaffs_write_begin - ok\n"));
 789
 790         return 0;
 791
 792 out:
 793         T(YAFFS_TRACE_OS, ( "end yaffs_write_begin fail returning %d\n",ret));
 794         if(space_held){
 795                 yaffs_release_space(filp);
 796         }
 797         if(pg) {
 798                 unlock_page(pg);
 799                 page_cache_release(pg);
 800         }
 801         return ret;
 802 }
 803
 804 #else
 805
 806 static int yaffs_prepare_write(struct file *f, struct page *pg,
 807                                unsigned offset, unsigned to)
 808 {
 809
 810         T(YAFFS_TRACE_OS, ( "yaffs_prepair_write\n"));
 811         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 812                 return yaffs_readpage_nolock(f, pg);
 813         return 0;
 814
 815 }
 816 #endif
 817
 818 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 819 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 820                            loff_t pos, unsigned len, unsigned copied,
 821                            struct page *pg, void *fsdadata)
 822 {
 823         int ret = 0;
 824         void *addr, *kva;
 825         uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE -1);
 826
 827
 828
 829         kva=kmap(pg);
 830         addr = kva + offset_into_page;
 831
 832         T(YAFFS_TRACE_OS,
 833           ( "yaffs_write_end addr %x pos %x nBytes %d\n", (unsigned) addr,
 834            (int)pos, copied));
 835
 836         ret = yaffs_file_write(filp, addr, copied, &pos);
 837
 838         if (ret != copied) {
 839                 T(YAFFS_TRACE_OS,
 840                   (
 841                    "yaffs_write_end not same size ret %d  copied %d\n",
 842                    ret, copied ));
 843                 SetPageError(pg);
 844                 ClearPageUptodate(pg);
 845         } else {
 846                 SetPageUptodate(pg);
 847         }
 848
 849         kunmap(pg);
 850
 851         yaffs_release_space(filp);
 852         unlock_page(pg);
 853         page_cache_release(pg);
 854         return ret;
 855 }
 856 #else
 857
 858 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 859                               unsigned to)
 860 {
 861
 862         void *addr, *kva;
 863
 864         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
 865         int nBytes = to - offset;
 866         int nWritten;
 867
 868         unsigned spos = pos;
 869         unsigned saddr;
 870
 871         kva=kmap(pg);
 872         addr = kva + offset;
 873
 874         saddr = (unsigned) addr;
 875
 876         T(YAFFS_TRACE_OS,
 877           ( "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
 878            spos, nBytes));
 879
 880         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
 881
 882         if (nWritten != nBytes) {
 883                 T(YAFFS_TRACE_OS,
 884                   (
 885                    "yaffs_commit_write not same size nWritten %d  nBytes %d\n",
 886                    nWritten, nBytes));
 887                 SetPageError(pg);
 888                 ClearPageUptodate(pg);
 889         } else {
 890                 SetPageUptodate(pg);
 891         }
 892
 893         kunmap(pg);
 894
 895         T(YAFFS_TRACE_OS,
 896           ( "yaffs_commit_write returning %d\n",
 897            nWritten == nBytes ? 0 : nWritten));
 898
 899         return nWritten == nBytes ? 0 : nWritten;
 900
 901 }
 902 #endif
 903
 904
 905 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
 906 {
 907         if (inode && obj) {
 908
 909
 910                 /* Check mode against the variant type and attempt to repair if broken. */
 911                 __u32 mode = obj->yst_mode;
 912                 switch( obj->variantType ){
 913                 case YAFFS_OBJECT_TYPE_FILE :
 914                         if( ! S_ISREG(mode) ){
 915                                 obj->yst_mode &= ~S_IFMT;
 916                                 obj->yst_mode |= S_IFREG;
 917                         }
 918
 919                         break;
 920                 case YAFFS_OBJECT_TYPE_SYMLINK :
 921                         if( ! S_ISLNK(mode) ){
 922                                 obj->yst_mode &= ~S_IFMT;
 923                                 obj->yst_mode |= S_IFLNK;
 924                         }
 925
 926                         break;
 927                 case YAFFS_OBJECT_TYPE_DIRECTORY :
 928                         if( ! S_ISDIR(mode) ){
 929                                 obj->yst_mode &= ~S_IFMT;
 930                                 obj->yst_mode |= S_IFDIR;
 931                         }
 932
 933                         break;
 934                 case YAFFS_OBJECT_TYPE_UNKNOWN :
 935                 case YAFFS_OBJECT_TYPE_HARDLINK :
 936                 case YAFFS_OBJECT_TYPE_SPECIAL :
 937                 default:
 938                         /* TODO? */
 939                         break;
 940                 }
 941
 942                 inode->i_flags |= S_NOATIME;
 943
 944                 inode->i_ino = obj->objectId;
 945                 inode->i_mode = obj->yst_mode;
 946                 inode->i_uid = obj->yst_uid;
 947                 inode->i_gid = obj->yst_gid;
 948 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
 949                 inode->i_blksize = inode->i_sb->s_blocksize;
 950 #endif
 951 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 952
 953                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 954                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
 955                 inode->i_atime.tv_nsec = 0;
 956                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
 957                 inode->i_mtime.tv_nsec = 0;
 958                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
 959                 inode->i_ctime.tv_nsec = 0;
 960 #else
 961                 inode->i_rdev = obj->yst_rdev;
 962                 inode->i_atime = obj->yst_atime;
 963                 inode->i_mtime = obj->yst_mtime;
 964                 inode->i_ctime = obj->yst_ctime;
 965 #endif
 966                 inode->i_size = yaffs_GetObjectFileLength(obj);
 967                 inode->i_blocks = (inode->i_size + 511) >> 9;
 968
 969                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 970
 971                 T(YAFFS_TRACE_OS,
 972                   (
 973                    "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 974                    inode->i_mode, inode->i_uid, inode->i_gid,
 975                    (int)inode->i_size, atomic_read(&inode->i_count)));
 976
 977                 switch (obj->yst_mode & S_IFMT) {
 978                 default:        /* fifo, device or socket */
 979 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 980                         init_special_inode(inode, obj->yst_mode,
 981                                            old_decode_dev(obj->yst_rdev));
 982 #else
 983                         init_special_inode(inode, obj->yst_mode,
 984                                            (dev_t) (obj->yst_rdev));
 985 #endif
 986                         break;
 987                 case S_IFREG:   /* file */
 988                         inode->i_op = &yaffs_file_inode_operations;
 989                         inode->i_fop = &yaffs_file_operations;
 990                         inode->i_mapping->a_ops =
 991                             &yaffs_file_address_operations;
 992                         break;
 993                 case S_IFDIR:   /* directory */
 994                         inode->i_op = &yaffs_dir_inode_operations;
 995                         inode->i_fop = &yaffs_dir_operations;
 996                         break;
 997                 case S_IFLNK:   /* symlink */
 998                         inode->i_op = &yaffs_symlink_inode_operations;
 999                         break;
1000                 }
1001
1002                 yaffs_InodeToObjectLV(inode) = obj;
1003
1004                 obj->myInode = inode;
1005
1006         } else {
1007                 T(YAFFS_TRACE_OS,
1008                   ( "yaffs_FileInode invalid parameters\n"));
1009         }
1010
1011 }
1012
1013 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1014                               yaffs_Object * obj)
1015 {
1016         struct inode *inode;
1017
1018         if (!sb) {
1019                 T(YAFFS_TRACE_OS,
1020                   ( "yaffs_get_inode for NULL super_block!!\n"));
1021                 return NULL;
1022
1023         }
1024
1025         if (!obj) {
1026                 T(YAFFS_TRACE_OS,
1027                   ( "yaffs_get_inode for NULL object!!\n"));
1028                 return NULL;
1029
1030         }
1031
1032         T(YAFFS_TRACE_OS,
1033           ( "yaffs_get_inode for object %d\n", obj->objectId));
1034
1035         inode = Y_IGET(sb, obj->objectId);
1036         if(IS_ERR(inode))
1037           return NULL;
1038
1039         /* NB Side effect: iget calls back to yaffs_read_inode(). */
1040         /* iget also increments the inode's i_count */
1041         /* NB You can't be holding grossLock or deadlock will happen! */
1042
1043         return inode;
1044 }
1045
1046 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1047                                 loff_t * pos)
1048 {
1049         yaffs_Object *obj;
1050         int nWritten, ipos;
1051         struct inode *inode;
1052         yaffs_Device *dev;
1053
1054         obj = yaffs_DentryToObject(f->f_dentry);
1055
1056         dev = obj->myDev;
1057
1058         yaffs_GrossLock(dev);
1059
1060         inode = f->f_dentry->d_inode;
1061
1062         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) {
1063                 ipos = inode->i_size;
1064         } else {
1065                 ipos = *pos;
1066         }
1067
1068         if (!obj) {
1069                 T(YAFFS_TRACE_OS,
1070                   ( "yaffs_file_write: hey obj is null!\n"));
1071         } else {
1072                 T(YAFFS_TRACE_OS,
1073                   (
1074                    "yaffs_file_write about to write writing %zu bytes"
1075                    "to object %d at %d\n",
1076                    n, obj->objectId, ipos));
1077         }
1078
1079         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
1080
1081         T(YAFFS_TRACE_OS,
1082           ( "yaffs_file_write writing %zu bytes, %d written at %d\n",
1083            n, nWritten, ipos));
1084         if (nWritten > 0) {
1085                 ipos += nWritten;
1086                 *pos = ipos;
1087                 if (ipos > inode->i_size) {
1088                         inode->i_size = ipos;
1089                         inode->i_blocks = (ipos + 511) >> 9;
1090
1091                         T(YAFFS_TRACE_OS,
1092                           (
1093                            "yaffs_file_write size updated to %d bytes, "
1094                            "%d blocks\n",
1095                            ipos, (int)(inode->i_blocks)));
1096                 }
1097
1098         }
1099         yaffs_GrossUnlock(dev);
1100         return nWritten == 0 ? -ENOSPC : nWritten;
1101 }
1102
1103 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1104 /* For now we just assume few parallel writes and check against a small number. */
1105 /* Todo: need to do this with a counter to handle parallel reads better */
1106
1107 static ssize_t yaffs_hold_space(struct file *f)
1108 {
1109         yaffs_Object *obj;
1110         yaffs_Device *dev;
1111
1112         int nFreeChunks;
1113
1114
1115         obj = yaffs_DentryToObject(f->f_dentry);
1116
1117         dev = obj->myDev;
1118
1119         yaffs_GrossLock(dev);
1120
1121         nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
1122
1123         yaffs_GrossUnlock(dev);
1124
1125         return (nFreeChunks > 20) ? 1 : 0;
1126 }
1127
1128 static void yaffs_release_space(struct file *f)
1129 {
1130         yaffs_Object *obj;
1131         yaffs_Device *dev;
1132
1133
1134         obj = yaffs_DentryToObject(f->f_dentry);
1135
1136         dev = obj->myDev;
1137
1138         yaffs_GrossLock(dev);
1139
1140
1141         yaffs_GrossUnlock(dev);
1142
1143 }
1144
1145 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1146 {
1147         yaffs_Object *obj;
1148         yaffs_Device *dev;
1149         struct inode *inode = f->f_dentry->d_inode;
1150         unsigned long offset, curoffs;
1151         struct ylist_head *i;
1152         yaffs_Object *l;
1153
1154         char name[YAFFS_MAX_NAME_LENGTH + 1];
1155
1156         obj = yaffs_DentryToObject(f->f_dentry);
1157         dev = obj->myDev;
1158
1159         yaffs_GrossLock(dev);
1160
1161         offset = f->f_pos;
1162
1163         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
1164
1165         if (offset == 0) {
1166                 T(YAFFS_TRACE_OS,
1167                   ( "yaffs_readdir: entry . ino %d \n",
1168                    (int)inode->i_ino));
1169                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR)
1170                     < 0) {
1171                         goto out;
1172                 }
1173                 offset++;
1174                 f->f_pos++;
1175         }
1176         if (offset == 1) {
1177                 T(YAFFS_TRACE_OS,
1178                   ( "yaffs_readdir: entry .. ino %d \n",
1179                    (int)f->f_dentry->d_parent->d_inode->i_ino));
1180                 if (filldir
1181                     (dirent, "..", 2, offset,
1182                      f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1183                         goto out;
1184                 }
1185                 offset++;
1186                 f->f_pos++;
1187         }
1188
1189         curoffs = 1;
1190
1191         /* If the directory has changed since the open or last call to
1192            readdir, rewind to after the 2 canned entries. */
1193
1194         if (f->f_version != inode->i_version) {
1195                 offset = 2;
1196                 f->f_pos = offset;
1197                 f->f_version = inode->i_version;
1198         }
1199
1200         ylist_for_each(i, &obj->variant.directoryVariant.children) {
1201                 curoffs++;
1202                 if (curoffs >= offset) {
1203                         l = ylist_entry(i, yaffs_Object, siblings);
1204
1205                         yaffs_GetObjectName(l, name,
1206                                             YAFFS_MAX_NAME_LENGTH + 1);
1207                         T(YAFFS_TRACE_OS,
1208                           ( "yaffs_readdir: %s inode %d\n", name,
1209                            yaffs_GetObjectInode(l)));
1210
1211                         if (filldir(dirent,
1212                                     name,
1213                                     strlen(name),
1214                                     offset,
1215                                     yaffs_GetObjectInode(l),
1216                                     yaffs_GetObjectType(l))
1217                             < 0) {
1218                                 goto up_and_out;
1219                         }
1220
1221                         offset++;
1222                         f->f_pos++;
1223                 }
1224         }
1225
1226       up_and_out:
1227       out:
1228
1229         yaffs_GrossUnlock(dev);
1230
1231         return 0;
1232 }
1233
1234 /*
1235  * File creation. Allocate an inode, and we're done..
1236  */
1237
1238 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
1239 #define YCRED(x) x
1240 #else
1241 #define YCRED(x) x->cred
1242 #endif
1243
1244 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1245 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1246                        dev_t rdev)
1247 #else
1248 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1249                        int rdev)
1250 #endif
1251 {
1252         struct inode *inode;
1253
1254         yaffs_Object *obj = NULL;
1255         yaffs_Device *dev;
1256
1257         yaffs_Object *parent = yaffs_InodeToObject(dir);
1258
1259         int error = -ENOSPC;
1260         uid_t uid = YCRED(current)->fsuid;
1261         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1262
1263         if((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1264                 mode |= S_ISGID;
1265
1266         if (parent) {
1267                 T(YAFFS_TRACE_OS,
1268                   ( "yaffs_mknod: parent object %d type %d\n",
1269                    parent->objectId, parent->variantType));
1270         } else {
1271                 T(YAFFS_TRACE_OS,
1272                   ( "yaffs_mknod: could not get parent object\n"));
1273                 return -EPERM;
1274         }
1275
1276         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1277                            "mode %x dev %x\n",
1278                            dentry->d_name.name, mode, rdev));
1279
1280         dev = parent->myDev;
1281
1282         yaffs_GrossLock(dev);
1283
1284         switch (mode & S_IFMT) {
1285         default:
1286                 /* Special (socket, fifo, device...) */
1287                 T(YAFFS_TRACE_OS, (
1288                                    "yaffs_mknod: making special\n"));
1289 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1290                 obj =
1291                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1292                                        gid, old_encode_dev(rdev));
1293 #else
1294                 obj =
1295                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1296                                        gid, rdev);
1297 #endif
1298                 break;
1299         case S_IFREG:           /* file          */
1300                 T(YAFFS_TRACE_OS, ( "yaffs_mknod: making file\n"));
1301                 obj =
1302                     yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1303                                     gid);
1304                 break;
1305         case S_IFDIR:           /* directory */
1306                 T(YAFFS_TRACE_OS,
1307                   ( "yaffs_mknod: making directory\n"));
1308                 obj =
1309                     yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1310                                          uid, gid);
1311                 break;
1312         case S_IFLNK:           /* symlink */
1313                 T(YAFFS_TRACE_OS, ( "yaffs_mknod: making symlink\n"));
1314                 obj = NULL;     /* Do we ever get here? */
1315                 break;
1316         }
1317
1318         /* Can not call yaffs_get_inode() with gross lock held */
1319         yaffs_GrossUnlock(dev);
1320
1321         if (obj) {
1322                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1323                 d_instantiate(dentry, inode);
1324                 T(YAFFS_TRACE_OS,
1325                   ( "yaffs_mknod created object %d count = %d\n",
1326                    obj->objectId, atomic_read(&inode->i_count)));
1327                 error = 0;
1328         } else {
1329                 T(YAFFS_TRACE_OS,
1330                   ( "yaffs_mknod failed making object\n"));
1331                 error = -ENOMEM;
1332         }
1333
1334         return error;
1335 }
1336
1337 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1338 {
1339         int retVal;
1340         T(YAFFS_TRACE_OS, ( "yaffs_mkdir\n"));
1341         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1342 #if 0
1343         /* attempt to fix dir bug - didn't work */
1344         if (!retVal) {
1345                 dget(dentry);
1346         }
1347 #endif
1348         return retVal;
1349 }
1350
1351 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1352 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1353                         struct nameidata *n)
1354 #else
1355 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1356 #endif
1357 {
1358         T(YAFFS_TRACE_OS, ( "yaffs_create\n"));
1359         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1360 }
1361
1362 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1363 {
1364         int retVal;
1365
1366         yaffs_Device *dev;
1367
1368         T(YAFFS_TRACE_OS,
1369           ( "yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1370            dentry->d_name.name));
1371
1372         dev = yaffs_InodeToObject(dir)->myDev;
1373
1374         yaffs_GrossLock(dev);
1375
1376         retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1377
1378         if (retVal == YAFFS_OK) {
1379                 dentry->d_inode->i_nlink--;
1380                 dir->i_version++;
1381                 yaffs_GrossUnlock(dev);
1382                 mark_inode_dirty(dentry->d_inode);
1383                 return 0;
1384         }
1385         yaffs_GrossUnlock(dev);
1386         return -ENOTEMPTY;
1387 }
1388
1389 /*
1390  * Create a link...
1391  */
1392 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1393                       struct dentry *dentry)
1394 {
1395         struct inode *inode = old_dentry->d_inode;
1396         yaffs_Object *obj = NULL;
1397         yaffs_Object *link = NULL;
1398         yaffs_Device *dev;
1399
1400         T(YAFFS_TRACE_OS, ( "yaffs_link\n"));
1401
1402         obj = yaffs_InodeToObject(inode);
1403         dev = obj->myDev;
1404
1405         yaffs_GrossLock(dev);
1406
1407         if (!S_ISDIR(inode->i_mode))    /* Don't link directories */
1408         {
1409                 link =
1410                     yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1411                                obj);
1412         }
1413
1414         if (link) {
1415                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1416                 d_instantiate(dentry, old_dentry->d_inode);
1417                 atomic_inc(&old_dentry->d_inode->i_count);
1418                 T(YAFFS_TRACE_OS,
1419                   ( "yaffs_link link count %d i_count %d\n",
1420                    old_dentry->d_inode->i_nlink,
1421                    atomic_read(&old_dentry->d_inode->i_count)));
1422
1423         }
1424
1425         yaffs_GrossUnlock(dev);
1426
1427         if (link) {
1428
1429                 return 0;
1430         }
1431
1432         return -EPERM;
1433 }
1434
1435 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1436                          const char *symname)
1437 {
1438         yaffs_Object *obj;
1439         yaffs_Device *dev;
1440         uid_t uid = YCRED(current)->fsuid;
1441         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1442
1443         T(YAFFS_TRACE_OS, ( "yaffs_symlink\n"));
1444
1445         dev = yaffs_InodeToObject(dir)->myDev;
1446         yaffs_GrossLock(dev);
1447         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1448                                  S_IFLNK | S_IRWXUGO, uid, gid, symname);
1449         yaffs_GrossUnlock(dev);
1450
1451         if (obj) {
1452
1453                 struct inode *inode;
1454
1455                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1456                 d_instantiate(dentry, inode);
1457                 T(YAFFS_TRACE_OS, ( "symlink created OK\n"));
1458                 return 0;
1459         } else {
1460                 T(YAFFS_TRACE_OS, ( "symlink not created\n"));
1461
1462         }
1463
1464         return -ENOMEM;
1465 }
1466
1467 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1468                              int datasync)
1469 {
1470
1471         yaffs_Object *obj;
1472         yaffs_Device *dev;
1473
1474         obj = yaffs_DentryToObject(dentry);
1475
1476         dev = obj->myDev;
1477
1478         T(YAFFS_TRACE_OS, ( "yaffs_sync_object\n"));
1479         yaffs_GrossLock(dev);
1480         yaffs_FlushFile(obj, 1);
1481         yaffs_GrossUnlock(dev);
1482         return 0;
1483 }
1484
1485 /*
1486  * The VFS layer already does all the dentry stuff for rename.
1487  *
1488  * NB: POSIX says you can rename an object over an old object of the same name
1489  */
1490 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1491                         struct inode *new_dir, struct dentry *new_dentry)
1492 {
1493         yaffs_Device *dev;
1494         int retVal = YAFFS_FAIL;
1495         yaffs_Object *target;
1496
1497         T(YAFFS_TRACE_OS, ( "yaffs_rename\n"));
1498         dev = yaffs_InodeToObject(old_dir)->myDev;
1499
1500         yaffs_GrossLock(dev);
1501
1502         /* Check if the target is an existing directory that is not empty. */
1503         target =
1504             yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1505                                    new_dentry->d_name.name);
1506
1507
1508
1509         if (target &&
1510             target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1511             !ylist_empty(&target->variant.directoryVariant.children)) {
1512
1513                 T(YAFFS_TRACE_OS, ( "target is non-empty dir\n"));
1514
1515                 retVal = YAFFS_FAIL;
1516         } else {
1517
1518                 /* Now does unlinking internally using shadowing mechanism */
1519                 T(YAFFS_TRACE_OS, ( "calling yaffs_RenameObject\n"));
1520
1521                 retVal =
1522                     yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1523                                        old_dentry->d_name.name,
1524                                        yaffs_InodeToObject(new_dir),
1525                                        new_dentry->d_name.name);
1526
1527         }
1528         yaffs_GrossUnlock(dev);
1529
1530         if (retVal == YAFFS_OK) {
1531                 if(target) {
1532                         new_dentry->d_inode->i_nlink--;
1533                         mark_inode_dirty(new_dentry->d_inode);
1534                 }
1535
1536                 return 0;
1537         } else {
1538                 return -ENOTEMPTY;
1539         }
1540
1541 }
1542
1543 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1544 {
1545         struct inode *inode = dentry->d_inode;
1546         int error;
1547         yaffs_Device *dev;
1548
1549         T(YAFFS_TRACE_OS,
1550           ( "yaffs_setattr of object %d\n",
1551            yaffs_InodeToObject(inode)->objectId));
1552
1553         if ((error = inode_change_ok(inode, attr)) == 0) {
1554
1555                 dev = yaffs_InodeToObject(inode)->myDev;
1556                 yaffs_GrossLock(dev);
1557                 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1558                     YAFFS_OK) {
1559                         error = 0;
1560                 } else {
1561                         error = -EPERM;
1562                 }
1563                 yaffs_GrossUnlock(dev);
1564                 if (!error)
1565                         error = inode_setattr(inode, attr);
1566         }
1567         return error;
1568 }
1569
1570 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1571 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1572 {
1573         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1574         struct super_block *sb = dentry->d_sb;
1575 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1576 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1577 {
1578         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1579 #else
1580 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1581 {
1582         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1583 #endif
1584
1585         T(YAFFS_TRACE_OS, ( "yaffs_statfs\n"));
1586
1587         yaffs_GrossLock(dev);
1588
1589         buf->f_type = YAFFS_MAGIC;
1590         buf->f_bsize = sb->s_blocksize;
1591         buf->f_namelen = 255;
1592
1593         if(dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)){
1594                 /* Do this if chunk size is not a power of 2 */
1595
1596                 uint64_t bytesInDev;
1597                 uint64_t bytesFree;
1598
1599                 bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock +1))) *
1600                              ((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk));
1601
1602                 do_div(bytesInDev,sb->s_blocksize); /* bytesInDev becomes the number of blocks */
1603                 buf->f_blocks = bytesInDev;
1604
1605                 bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
1606                              ((uint64_t)(dev->nDataBytesPerChunk));
1607
1608                 do_div(bytesFree,sb->s_blocksize);
1609
1610                 buf->f_bfree = bytesFree;
1611
1612         } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1613
1614                 buf->f_blocks =
1615                            (dev->endBlock - dev->startBlock + 1) *
1616                             dev->nChunksPerBlock /
1617                             (sb->s_blocksize / dev->nDataBytesPerChunk);
1618                 buf->f_bfree =
1619                            yaffs_GetNumberOfFreeChunks(dev) /
1620                            (sb->s_blocksize / dev->nDataBytesPerChunk);
1621         } else {
1622                buf->f_blocks =
1623                            (dev->endBlock - dev->startBlock + 1) *
1624                            dev->nChunksPerBlock *
1625                            (dev->nDataBytesPerChunk / sb->s_blocksize);
1626
1627                        buf->f_bfree =
1628                            yaffs_GetNumberOfFreeChunks(dev) *
1629                            (dev->nDataBytesPerChunk / sb->s_blocksize);
1630         }
1631
1632
1633         buf->f_files = 0;
1634         buf->f_ffree = 0;
1635         buf->f_bavail = buf->f_bfree;
1636
1637         yaffs_GrossUnlock(dev);
1638         return 0;
1639 }
1640
1641
1642 static int yaffs_do_sync_fs(struct super_block *sb)
1643 {
1644
1645         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1646         T(YAFFS_TRACE_OS, ( "yaffs_do_sync_fs\n"));
1647
1648         if(sb->s_dirt) {
1649                 yaffs_GrossLock(dev);
1650
1651                 if(dev){
1652                         yaffs_FlushEntireDeviceCache(dev);
1653                         yaffs_CheckpointSave(dev);
1654                 }
1655
1656                 yaffs_GrossUnlock(dev);
1657
1658                 sb->s_dirt = 0;
1659         }
1660         return 0;
1661 }
1662
1663
1664 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1665 static void yaffs_write_super(struct super_block *sb)
1666 #else
1667 static int yaffs_write_super(struct super_block *sb)
1668 #endif
1669 {
1670
1671         T(YAFFS_TRACE_OS, ( "yaffs_write_super\n"));
1672         if (yaffs_auto_checkpoint >= 2)
1673                 yaffs_do_sync_fs(sb);
1674 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
1675         return 0;
1676 #endif
1677 }
1678
1679
1680 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1681 static int yaffs_sync_fs(struct super_block *sb, int wait)
1682 #else
1683 static int yaffs_sync_fs(struct super_block *sb)
1684 #endif
1685 {
1686
1687         T(YAFFS_TRACE_OS, ( "yaffs_sync_fs\n"));
1688
1689         if (yaffs_auto_checkpoint >= 1)
1690                 yaffs_do_sync_fs(sb);
1691
1692         return 0;
1693
1694 }
1695
1696 #ifdef YAFFS_USE_OWN_IGET
1697
1698 static struct inode * yaffs_iget(struct super_block *sb, unsigned long ino)
1699 {
1700         struct inode *inode;
1701         yaffs_Object *obj;
1702         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1703
1704         T(YAFFS_TRACE_OS,
1705           ( "yaffs_iget for %lu\n", ino));
1706
1707         inode = iget_locked(sb, ino);
1708         if (!inode)
1709                 return ERR_PTR(-ENOMEM);
1710         if (!(inode->i_state & I_NEW))
1711                 return inode;
1712
1713        /* NB This is called as a side effect of other functions, but
1714         * we had to release the lock to prevent deadlocks, so
1715         * need to lock again.
1716         */
1717
1718         yaffs_GrossLock(dev);
1719
1720         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1721
1722         yaffs_FillInodeFromObject(inode, obj);
1723
1724         yaffs_GrossUnlock(dev);
1725
1726         unlock_new_inode(inode);
1727         return inode;
1728 }
1729
1730 #else
1731
1732 static void yaffs_read_inode(struct inode *inode)
1733 {
1734         /* NB This is called as a side effect of other functions, but
1735          * we had to release the lock to prevent deadlocks, so
1736          * need to lock again.
1737          */
1738
1739         yaffs_Object *obj;
1740         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1741
1742         T(YAFFS_TRACE_OS,
1743           ( "yaffs_read_inode for %d\n", (int)inode->i_ino));
1744
1745         yaffs_GrossLock(dev);
1746
1747         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1748
1749         yaffs_FillInodeFromObject(inode, obj);
1750
1751         yaffs_GrossUnlock(dev);
1752 }
1753
1754 #endif
1755
1756 static YLIST_HEAD(yaffs_dev_list);
1757
1758 #if 0 // not used
1759 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1760 {
1761         yaffs_Device    *dev = yaffs_SuperToDevice(sb);
1762
1763         if( *flags & MS_RDONLY ) {
1764                 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1765
1766                 T(YAFFS_TRACE_OS,
1767                         ( "yaffs_remount_fs: %s: RO\n", dev->name ));
1768
1769                 yaffs_GrossLock(dev);
1770
1771                 yaffs_FlushEntireDeviceCache(dev);
1772
1773                 yaffs_CheckpointSave(dev);
1774
1775                 if (mtd->sync)
1776                         mtd->sync(mtd);
1777
1778                 yaffs_GrossUnlock(dev);
1779         }
1780         else {
1781                 T(YAFFS_TRACE_OS,
1782                         ( "yaffs_remount_fs: %s: RW\n", dev->name ));
1783         }
1784
1785         return 0;
1786 }
1787 #endif
1788
1789 static void yaffs_put_super(struct super_block *sb)
1790 {
1791         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1792
1793         T(YAFFS_TRACE_OS, ( "yaffs_put_super\n"));
1794
1795         yaffs_GrossLock(dev);
1796
1797         yaffs_FlushEntireDeviceCache(dev);
1798
1799         yaffs_CheckpointSave(dev);
1800
1801         if (dev->putSuperFunc) {
1802                 dev->putSuperFunc(sb);
1803         }
1804
1805         yaffs_Deinitialise(dev);
1806
1807         yaffs_GrossUnlock(dev);
1808
1809         /* we assume this is protected by lock_kernel() in mount/umount */
1810         ylist_del(&dev->devList);
1811
1812         if(dev->spareBuffer){
1813                 YFREE(dev->spareBuffer);
1814                 dev->spareBuffer = NULL;
1815         }
1816
1817         kfree(dev);
1818 }
1819
1820
1821 static void yaffs_MTDPutSuper(struct super_block *sb)
1822 {
1823
1824         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1825
1826         if (mtd->sync) {
1827                 mtd->sync(mtd);
1828         }
1829
1830         put_mtd_device(mtd);
1831 }
1832
1833
1834 static void yaffs_MarkSuperBlockDirty(void *vsb)
1835 {
1836         struct super_block *sb = (struct super_block *)vsb;
1837
1838         T(YAFFS_TRACE_OS, ( "yaffs_MarkSuperBlockDirty() sb = %p\n",sb));
1839         if(sb)
1840                 sb->s_dirt = 1;
1841 }
1842
1843 typedef struct {
1844         int inband_tags;
1845         int skip_checkpoint_read;
1846         int skip_checkpoint_write;
1847         int no_cache;
1848 } yaffs_options;
1849
1850 #define MAX_OPT_LEN 20
1851 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1852 {
1853         char cur_opt[MAX_OPT_LEN+1];
1854         int p;
1855         int error = 0;
1856
1857         /* Parse through the options which is a comma seperated list */
1858
1859         while(options_str && *options_str && !error){
1860                 memset(cur_opt,0,MAX_OPT_LEN+1);
1861                 p = 0;
1862
1863                 while(*options_str && *options_str != ','){
1864                         if(p < MAX_OPT_LEN){
1865                                 cur_opt[p] = *options_str;
1866                                 p++;
1867                         }
1868                         options_str++;
1869                 }
1870
1871                 if(!strcmp(cur_opt,"inband-tags"))
1872                         options->inband_tags = 1;
1873                 else if(!strcmp(cur_opt,"no-cache"))
1874                         options->no_cache = 1;
1875                 else if(!strcmp(cur_opt,"no-checkpoint-read"))
1876                         options->skip_checkpoint_read = 1;
1877                 else if(!strcmp(cur_opt,"no-checkpoint-write"))
1878                         options->skip_checkpoint_write = 1;
1879                 else if(!strcmp(cur_opt,"no-checkpoint")){
1880                         options->skip_checkpoint_read = 1;
1881                         options->skip_checkpoint_write = 1;
1882                 } else {
1883                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",cur_opt);
1884                         error = 1;
1885                 }
1886
1887         }
1888
1889         return error;
1890 }
1891
1892 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1893                                                      struct super_block *sb,
1894                                                      void *data, int silent)
1895 {
1896         int nBlocks;
1897         struct inode *inode = NULL;
1898         struct dentry *root;
1899         yaffs_Device *dev = 0;
1900         char devname_buf[BDEVNAME_SIZE + 1];
1901         struct mtd_info *mtd;
1902         int err;
1903         char *data_str = (char *)data;
1904
1905         yaffs_options options;
1906
1907         sb->s_magic = YAFFS_MAGIC;
1908         sb->s_op = &yaffs_super_ops;
1909         sb->s_flags |= MS_NOATIME;
1910
1911         if (!sb)
1912                 printk(KERN_INFO "yaffs: sb is NULL\n");
1913         else if (!sb->s_dev)
1914                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1915         else if (!yaffs_devname(sb, devname_buf))
1916                 printk(KERN_INFO "yaffs: devname is NULL\n");
1917         else
1918                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1919                        sb->s_dev,
1920                        yaffs_devname(sb, devname_buf));
1921
1922         if(!data_str)
1923                 data_str = "";
1924
1925         printk(KERN_INFO "yaffs: passed flags \"%s\"\n",data_str);
1926
1927         memset(&options,0,sizeof(options));
1928
1929         if(yaffs_parse_options(&options,data_str)){
1930                 /* Option parsing failed */
1931                 return NULL;
1932         }
1933
1934
1935         sb->s_blocksize = PAGE_CACHE_SIZE;
1936         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1937         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1938         T(YAFFS_TRACE_OS,
1939           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1940
1941 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1942         T(YAFFS_TRACE_OS,
1943           ("yaffs: Write verification disabled. All guarantees "
1944            "null and void\n"));
1945 #endif
1946
1947         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1948                                "\"%s\"\n",
1949                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
1950                                yaffs_devname(sb, devname_buf)));
1951
1952         /* Check it's an mtd device..... */
1953         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
1954                 return NULL;    /* This isn't an mtd device */
1955         }
1956         /* Get the device */
1957         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1958         if (!mtd) {
1959                 T(YAFFS_TRACE_ALWAYS,
1960                   ("yaffs: MTD device #%u doesn't appear to exist\n",
1961                    MINOR(sb->s_dev)));
1962                 return NULL;
1963         }
1964         /* Check it's NAND */
1965         if (mtd->type != MTD_NANDFLASH) {
1966                 T(YAFFS_TRACE_ALWAYS,
1967                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1968                 return NULL;
1969         }
1970
1971         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1972         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1973         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1974         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1975         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1976         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1977         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1978         T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1979         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1980         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1981 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
1982         T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
1983 #else
1984         T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
1985 #endif
1986
1987 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1988
1989         if (yaffsVersion == 1 &&
1990             WRITE_SIZE(mtd) >= 2048) {
1991             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n"));
1992             yaffsVersion = 2;
1993         }
1994
1995         /* Added NCB 26/5/2006 for completeness */
1996         if (yaffsVersion == 2 &&
1997             !options.inband_tags &&
1998             WRITE_SIZE(mtd) == 512){
1999             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs1\n"));
2000             yaffsVersion = 1;
2001         }
2002
2003 #endif
2004
2005         if (yaffsVersion == 2) {
2006                 /* Check for version 2 style functions */
2007                 if (!mtd->erase ||
2008                     !mtd->block_isbad ||
2009                     !mtd->block_markbad ||
2010                     !mtd->read ||
2011                     !mtd->write ||
2012 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
2013                     !mtd->read_oob || !mtd->write_oob) {
2014 #else
2015                     !mtd->write_ecc ||
2016                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2017 #endif
2018                         T(YAFFS_TRACE_ALWAYS,
2019                           ("yaffs: MTD device does not support required "
2020                            "functions\n"));;
2021                         return NULL;
2022                 }
2023
2024                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2025                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2026                     !options.inband_tags) {
2027                         T(YAFFS_TRACE_ALWAYS,
2028                           ("yaffs: MTD device does not have the "
2029                            "right page sizes\n"));
2030                         return NULL;
2031                 }
2032         } else {
2033                 /* Check for V1 style functions */
2034                 if (!mtd->erase ||
2035                     !mtd->read ||
2036                     !mtd->write ||
2037 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
2038                     !mtd->read_oob || !mtd->write_oob) {
2039 #else
2040                     !mtd->write_ecc ||
2041                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2042 #endif
2043                         T(YAFFS_TRACE_ALWAYS,
2044                           ("yaffs: MTD device does not support required "
2045                            "functions\n"));;
2046                         return NULL;
2047                 }
2048
2049                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2050                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2051                         T(YAFFS_TRACE_ALWAYS,
2052                           ("yaffs: MTD device does not support have the "
2053                            "right page sizes\n"));
2054                         return NULL;
2055                 }
2056         }
2057
2058         /* OK, so if we got here, we have an MTD that's NAND and looks
2059          * like it has the right capabilities
2060          * Set the yaffs_Device up for mtd
2061          */
2062
2063 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
2064         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2065 #else
2066         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2067 #endif
2068         if (!dev) {
2069                 /* Deep shit could not allocate device structure */
2070                 T(YAFFS_TRACE_ALWAYS,
2071                   ("yaffs_read_super: Failed trying to allocate "
2072                    "yaffs_Device. \n"));
2073                 return NULL;
2074         }
2075
2076         memset(dev, 0, sizeof(yaffs_Device));
2077         dev->genericDevice = mtd;
2078         dev->name = mtd->name;
2079
2080         /* Set up the memory size parameters.... */
2081
2082         nBlocks = YCALCBLOCKS(mtd->size ,(YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2083
2084         dev->startBlock = 0;
2085         dev->endBlock = nBlocks - 1;
2086         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
2087         dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
2088         dev->nReservedBlocks = 5;
2089         dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
2090         dev->inbandTags = options.inband_tags;
2091
2092         /* ... and the functions. */
2093         if (yaffsVersion == 2) {
2094                 dev->writeChunkWithTagsToNAND =
2095                     nandmtd2_WriteChunkWithTagsToNAND;
2096                 dev->readChunkWithTagsFromNAND =
2097                     nandmtd2_ReadChunkWithTagsFromNAND;
2098                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
2099                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
2100                 dev->spareBuffer = YMALLOC(mtd->oobsize);
2101                 dev->isYaffs2 = 1;
2102 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
2103                 dev->totalBytesPerChunk = mtd->writesize;
2104                 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
2105 #else
2106                 dev->totalBytesPerChunk = mtd->oobblock;
2107                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
2108 #endif
2109                 nBlocks = YCALCBLOCKS(mtd->size,mtd->erasesize);
2110
2111                 dev->startBlock = 0;
2112                 dev->endBlock = nBlocks - 1;
2113         } else {
2114 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
2115                 /* use the MTD interface in yaffs_mtdif1.c */
2116                 dev->writeChunkWithTagsToNAND =
2117                         nandmtd1_WriteChunkWithTagsToNAND;
2118                 dev->readChunkWithTagsFromNAND =
2119                         nandmtd1_ReadChunkWithTagsFromNAND;
2120                 dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
2121                 dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
2122 #else
2123                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
2124                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
2125 #endif
2126                 dev->isYaffs2 = 0;
2127         }
2128         /* ... and common functions */
2129         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
2130         dev->initialiseNAND = nandmtd_InitialiseNAND;
2131
2132         dev->putSuperFunc = yaffs_MTDPutSuper;
2133
2134         dev->superBlock = (void *)sb;
2135         dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
2136
2137
2138 #ifndef CONFIG_YAFFS_DOES_ECC
2139         dev->useNANDECC = 1;
2140 #endif
2141
2142 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2143         dev->wideTnodesDisabled = 1;
2144 #endif
2145
2146         dev->skipCheckpointRead = options.skip_checkpoint_read;
2147         dev->skipCheckpointWrite = options.skip_checkpoint_write;
2148
2149         /* we assume this is protected by lock_kernel() in mount/umount */
2150         ylist_add_tail(&dev->devList, &yaffs_dev_list);
2151
2152         init_MUTEX(&dev->grossLock);
2153
2154         yaffs_GrossLock(dev);
2155
2156         err = yaffs_GutsInitialise(dev);
2157
2158         T(YAFFS_TRACE_OS,
2159           ("yaffs_read_super: guts initialised %s\n",
2160            (err == YAFFS_OK) ? "OK" : "FAILED"));
2161
2162         /* Release lock before yaffs_get_inode() */
2163         yaffs_GrossUnlock(dev);
2164
2165         /* Create root inode */
2166         if (err == YAFFS_OK)
2167                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
2168                                         yaffs_Root(dev));
2169
2170         if (!inode)
2171                 return NULL;
2172
2173         inode->i_op = &yaffs_dir_inode_operations;
2174         inode->i_fop = &yaffs_dir_operations;
2175
2176         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
2177
2178         root = d_alloc_root(inode);
2179
2180         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
2181
2182         if (!root) {
2183                 iput(inode);
2184                 return NULL;
2185         }
2186         sb->s_root = root;
2187         sb->s_dirt = !dev->isCheckpointed;
2188         T(YAFFS_TRACE_ALWAYS,
2189           ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
2190
2191         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
2192         return sb;
2193 }
2194
2195
2196 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
2197 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2198                                          int silent)
2199 {
2200         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2201 }
2202
2203 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
2204 static int yaffs_read_super(struct file_system_type *fs,
2205                             int flags, const char *dev_name,
2206                             void *data, struct vfsmount *mnt)
2207 {
2208
2209         return get_sb_bdev(fs, flags, dev_name, data,
2210                            yaffs_internal_read_super_mtd, mnt);
2211 }
2212 #else
2213 static struct super_block *yaffs_read_super(struct file_system_type *fs,
2214                                             int flags, const char *dev_name,
2215                                             void *data)
2216 {
2217
2218         return get_sb_bdev(fs, flags, dev_name, data,
2219                            yaffs_internal_read_super_mtd);
2220 }
2221 #endif
2222
2223 static struct file_system_type yaffs_fs_type = {
2224         .owner = THIS_MODULE,
2225         .name = "yaffs",
2226         .get_sb = yaffs_read_super,
2227         .kill_sb = kill_block_super,
2228         .fs_flags = FS_REQUIRES_DEV,
2229 };
2230 #else
2231 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
2232                                             int silent)
2233 {
2234         return yaffs_internal_read_super(1, sb, data, silent);
2235 }
2236
2237 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
2238                       FS_REQUIRES_DEV);
2239 #endif
2240
2241
2242 #ifdef CONFIG_YAFFS_YAFFS2
2243
2244 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
2245 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2246                                           int silent)
2247 {
2248         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2249 }
2250
2251 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
2252 static int yaffs2_read_super(struct file_system_type *fs,
2253                         int flags, const char *dev_name, void *data,
2254                         struct vfsmount *mnt)
2255 {
2256         return get_sb_bdev(fs, flags, dev_name, data,
2257                         yaffs2_internal_read_super_mtd, mnt);
2258 }
2259 #else
2260 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
2261                                              int flags, const char *dev_name,
2262                                              void *data)
2263 {
2264
2265         return get_sb_bdev(fs, flags, dev_name, data,
2266                            yaffs2_internal_read_super_mtd);
2267 }
2268 #endif
2269
2270 static struct file_system_type yaffs2_fs_type = {
2271         .owner = THIS_MODULE,
2272         .name = "yaffs2",
2273         .get_sb = yaffs2_read_super,
2274         .kill_sb = kill_block_super,
2275         .fs_flags = FS_REQUIRES_DEV,
2276 };
2277 #else
2278 static struct super_block *yaffs2_read_super(struct super_block *sb,
2279                                              void *data, int silent)
2280 {
2281         return yaffs_internal_read_super(2, sb, data, silent);
2282 }
2283
2284 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
2285                       FS_REQUIRES_DEV);
2286 #endif
2287
2288 #endif                          /* CONFIG_YAFFS_YAFFS2 */
2289
2290 static struct proc_dir_entry *my_proc_entry;
2291
2292 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
2293 {
2294         buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
2295         buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
2296         buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
2297         buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
2298         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
2299         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
2300         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
2301         buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
2302         buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2303         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2304         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2305         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2306         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2307         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2308         buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
2309         buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
2310         buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
2311         buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
2312         buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
2313         buf += sprintf(buf, "passiveGCs......... %d\n",
2314                     dev->passiveGarbageCollections);
2315         buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
2316         buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
2317         buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
2318         buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
2319         buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
2320         buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
2321         buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
2322         buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
2323         buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
2324         buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
2325         buf +=
2326             sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
2327         buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
2328         buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
2329         buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);
2330
2331         return buf;
2332 }
2333
2334 static int yaffs_proc_read(char *page,
2335                            char **start,
2336                            off_t offset, int count, int *eof, void *data)
2337 {
2338         struct ylist_head *item;
2339         char *buf = page;
2340         int step = offset;
2341         int n = 0;
2342
2343         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2344          * We use 'offset' (*ppos) to indicate where we are in devList.
2345          * This also assumes the user has posted a read buffer large
2346          * enough to hold the complete output; but that's life in /proc.
2347          */
2348
2349         *(int *)start = 1;
2350
2351         /* Print header first */
2352         if (step == 0) {
2353                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2354                                "\n%s\n%s\n", yaffs_fs_c_version,
2355                                yaffs_guts_c_version);
2356         }
2357
2358         /* hold lock_kernel while traversing yaffs_dev_list */
2359         lock_kernel();
2360
2361         /* Locate and print the Nth entry.  Order N-squared but N is small. */
2362         ylist_for_each(item, &yaffs_dev_list) {
2363                 yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
2364                 if (n < step) {
2365                         n++;
2366                         continue;
2367                 }
2368                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2369                 buf = yaffs_dump_dev(buf, dev);
2370                 break;
2371         }
2372         unlock_kernel();
2373
2374         return buf - page < count ? buf - page : count;
2375 }
2376
2377 /**
2378  * Set the verbosity of the warnings and error messages.
2379  *
2380  * Note that the names can only be a..z or _ with the current code.
2381  */
2382
2383 static struct {
2384         char *mask_name;
2385         unsigned mask_bitfield;
2386 } mask_flags[] = {
2387         {"allocate", YAFFS_TRACE_ALLOCATE},
2388         {"always", YAFFS_TRACE_ALWAYS},
2389         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2390         {"buffers", YAFFS_TRACE_BUFFERS},
2391         {"bug", YAFFS_TRACE_BUG},
2392         {"checkpt", YAFFS_TRACE_CHECKPOINT},
2393         {"deletion", YAFFS_TRACE_DELETION},
2394         {"erase", YAFFS_TRACE_ERASE},
2395         {"error", YAFFS_TRACE_ERROR},
2396         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2397         {"gc", YAFFS_TRACE_GC},
2398         {"mtd", YAFFS_TRACE_MTD},
2399         {"nandaccess", YAFFS_TRACE_NANDACCESS},
2400         {"os", YAFFS_TRACE_OS},
2401         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2402         {"scan", YAFFS_TRACE_SCAN},
2403         {"tracing", YAFFS_TRACE_TRACING},
2404
2405         {"verify", YAFFS_TRACE_VERIFY},
2406         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2407         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2408         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2409
2410         {"write", YAFFS_TRACE_WRITE},
2411         {"all", 0xffffffff},
2412         {"none", 0},
2413         {NULL, 0},
2414 };
2415
2416 #define MAX_MASK_NAME_LENGTH 40
2417 static int yaffs_proc_write(struct file *file, const char *buf,
2418                                          unsigned long count, void *data)
2419 {
2420         unsigned rg = 0, mask_bitfield;
2421         char *end;
2422         char *mask_name;
2423         const char *x;
2424         char substring[MAX_MASK_NAME_LENGTH+1];
2425         int i;
2426         int done = 0;
2427         int add, len = 0;
2428         int pos = 0;
2429
2430         rg = yaffs_traceMask;
2431
2432         while (!done && (pos < count)) {
2433                 done = 1;
2434                 while ((pos < count) && isspace(buf[pos])) {
2435                         pos++;
2436                 }
2437
2438                 switch (buf[pos]) {
2439                 case '+':
2440                 case '-':
2441                 case '=':
2442                         add = buf[pos];
2443                         pos++;
2444                         break;
2445
2446                 default:
2447                         add = ' ';
2448                         break;
2449                 }
2450                 mask_name = NULL;
2451
2452                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2453                 if (end > buf + pos) {
2454                         mask_name = "numeral";
2455                         len = end - (buf + pos);
2456                         pos += len;
2457                         done = 0;
2458                 } else {
2459                         for(x = buf + pos, i = 0;
2460                             (*x == '_' || (*x >='a' && *x <= 'z')) &&
2461                             i <MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2462                             substring[i] = *x;
2463                         substring[i] = '\0';
2464
2465                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2466                                 if(strcmp(substring,mask_flags[i].mask_name) == 0){
2467                                         mask_name = mask_flags[i].mask_name;
2468                                         mask_bitfield = mask_flags[i].mask_bitfield;
2469                                         done = 0;
2470                                         break;
2471                                 }
2472                         }
2473                 }
2474
2475                 if (mask_name != NULL) {
2476                         done = 0;
2477                         switch(add) {
2478                         case '-':
2479                                 rg &= ~mask_bitfield;
2480                                 break;
2481                         case '+':
2482                                 rg |= mask_bitfield;
2483                                 break;
2484                         case '=':
2485                                 rg = mask_bitfield;
2486                                 break;
2487                         default:
2488                                 rg |= mask_bitfield;
2489                                 break;
2490                         }
2491                 }
2492         }
2493
2494         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2495
2496         printk("new trace = 0x%08X\n",yaffs_traceMask);
2497
2498         if (rg & YAFFS_TRACE_ALWAYS) {
2499                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2500                         char flag;
2501                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2502                         printk("%c%s\n", flag, mask_flags[i].mask_name);
2503                 }
2504         }
2505
2506         return count;
2507 }
2508
2509 /* Stuff to handle installation of file systems */
2510 struct file_system_to_install {
2511         struct file_system_type *fst;
2512         int installed;
2513 };
2514
2515 static struct file_system_to_install fs_to_install[] = {
2516 //#ifdef CONFIG_YAFFS_YAFFS1
2517         {&yaffs_fs_type, 0},
2518 //#endif
2519 //#ifdef CONFIG_YAFFS_YAFFS2
2520         {&yaffs2_fs_type, 0},
2521 //#endif
2522         {NULL, 0}
2523 };
2524
2525 static int __init init_yaffs_fs(void)
2526 {
2527         int error = 0;
2528         struct file_system_to_install *fsinst;
2529
2530         T(YAFFS_TRACE_ALWAYS,
2531           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2532
2533         /* Install the proc_fs entry */
2534         my_proc_entry = create_proc_entry("yaffs",
2535                                                S_IRUGO | S_IFREG,
2536                                                YPROC_ROOT);
2537
2538         if (my_proc_entry) {
2539                 my_proc_entry->write_proc = yaffs_proc_write;
2540                 my_proc_entry->read_proc = yaffs_proc_read;
2541                 my_proc_entry->data = NULL;
2542         } else {
2543                 return -ENOMEM;
2544         }
2545
2546         /* Now add the file system entries */
2547
2548         fsinst = fs_to_install;
2549
2550         while (fsinst->fst && !error) {
2551                 error = register_filesystem(fsinst->fst);
2552                 if (!error) {
2553                         fsinst->installed = 1;
2554                 }
2555                 fsinst++;
2556         }
2557
2558         /* Any errors? uninstall  */
2559         if (error) {
2560                 fsinst = fs_to_install;
2561
2562                 while (fsinst->fst) {
2563                         if (fsinst->installed) {
2564                                 unregister_filesystem(fsinst->fst);
2565                                 fsinst->installed = 0;
2566                         }
2567                         fsinst++;
2568                 }
2569         }
2570
2571         return error;
2572 }
2573
2574 static void __exit exit_yaffs_fs(void)
2575 {
2576
2577         struct file_system_to_install *fsinst;
2578
2579         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2580                                " removing. \n"));
2581
2582         remove_proc_entry("yaffs", YPROC_ROOT);
2583
2584         fsinst = fs_to_install;
2585
2586         while (fsinst->fst) {
2587                 if (fsinst->installed) {
2588                         unregister_filesystem(fsinst->fst);
2589                         fsinst->installed = 0;
2590                 }
2591                 fsinst++;
2592         }
2593
2594 }
2595
2596 module_init(init_yaffs_fs)
2597 module_exit(exit_yaffs_fs)
2598
2599 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2600 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2601 MODULE_LICENSE("GPL");