yaffs_fs.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2009 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 1.80 2009-05-12 02:23:51 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 <linux/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 <linux/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 const 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 const 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 const 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 const struct inode_operations yaffs_file_inode_operations = {
 319         .setattr = yaffs_setattr,
 320 };
 321
 322 static const 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 const 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 const struct file_operations yaffs_dir_operations = {
 342         .read = generic_read_dir,
 343         .readdir = yaffs_readdir,
 344         .fsync = yaffs_sync_object,
 345 };
 346
 347 static const 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         down(&dev->grossLock);
 367         T(YAFFS_TRACE_OS, ("yaffs locked %p\n", current));
 368 }
 369
 370 static void yaffs_GrossUnlock(yaffs_Device *dev)
 371 {
 372         T(YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current));
 373         up(&dev->grossLock);
 374 }
 375
 376 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
 377                         int buflen)
 378 {
 379         unsigned char *alias;
 380         int ret;
 381
 382         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 383
 384         yaffs_GrossLock(dev);
 385
 386         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 387
 388         yaffs_GrossUnlock(dev);
 389
 390         if (!alias)
 391                 return -ENOMEM;
 392
 393         ret = vfs_readlink(dentry, buffer, buflen, alias);
 394         kfree(alias);
 395         return ret;
 396 }
 397
 398 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 399 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 400 #else
 401 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 402 #endif
 403 {
 404         unsigned char *alias;
 405         int ret;
 406         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 407
 408         yaffs_GrossLock(dev);
 409
 410         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 411
 412         yaffs_GrossUnlock(dev);
 413
 414         if (!alias) {
 415                 ret = -ENOMEM;
 416                 goto out;
 417         }
 418
 419         ret = vfs_follow_link(nd, alias);
 420         kfree(alias);
 421 out:
 422 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 423         return ERR_PTR(ret);
 424 #else
 425         return ret;
 426 #endif
 427 }
 428
 429 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 430                                 yaffs_Object *obj);
 431
 432 /*
 433  * Lookup is used to find objects in the fs
 434  */
 435 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 436
 437 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 438                                 struct nameidata *n)
 439 #else
 440 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 441 #endif
 442 {
 443         yaffs_Object *obj;
 444         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 445
 446         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 447
 448         yaffs_GrossLock(dev);
 449
 450         T(YAFFS_TRACE_OS,
 451                 ("yaffs_lookup for %d:%s\n",
 452                 yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 453
 454         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
 455                                         dentry->d_name.name);
 456
 457         obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
 458
 459         /* Can't hold gross lock when calling yaffs_get_inode() */
 460         yaffs_GrossUnlock(dev);
 461
 462         if (obj) {
 463                 T(YAFFS_TRACE_OS,
 464                         ("yaffs_lookup found %d\n", obj->objectId));
 465
 466                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 467
 468                 if (inode) {
 469                         T(YAFFS_TRACE_OS,
 470                                 ("yaffs_loookup dentry \n"));
 471 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 472  * d_add even if NULL inode */
 473 #if 0
 474                         /*dget(dentry); // try to solve directory bug */
 475                         d_add(dentry, inode);
 476
 477                         /* return dentry; */
 478                         return NULL;
 479 #endif
 480                 }
 481
 482         } else {
 483                 T(YAFFS_TRACE_OS, ("yaffs_lookup not found\n"));
 484
 485         }
 486
 487 /* added NCB for 2.5/6 compatability - forces add even if inode is
 488  * NULL which creates dentry hash */
 489         d_add(dentry, inode);
 490
 491         return NULL;
 492 }
 493
 494
 495 #ifdef YAFFS_HAS_PUT_INODE
 496
 497 /* For now put inode is just for debugging
 498  * Put inode is called when the inode **structure** is put.
 499  */
 500 static void yaffs_put_inode(struct inode *inode)
 501 {
 502         T(YAFFS_TRACE_OS,
 503                 ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 504                 atomic_read(&inode->i_count)));
 505
 506 }
 507 #endif
 508
 509 /* clear is called to tell the fs to release any per-inode data it holds */
 510 static void yaffs_clear_inode(struct inode *inode)
 511 {
 512         yaffs_Object *obj;
 513         yaffs_Device *dev;
 514
 515         obj = yaffs_InodeToObject(inode);
 516
 517         T(YAFFS_TRACE_OS,
 518                 ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 519                 atomic_read(&inode->i_count),
 520                 obj ? "object exists" : "null object"));
 521
 522         if (obj) {
 523                 dev = obj->myDev;
 524                 yaffs_GrossLock(dev);
 525
 526                 /* Clear the association between the inode and
 527                  * the yaffs_Object.
 528                  */
 529                 obj->myInode = NULL;
 530                 yaffs_InodeToObjectLV(inode) = NULL;
 531
 532                 /* If the object freeing was deferred, then the real
 533                  * free happens now.
 534                  * This should fix the inode inconsistency problem.
 535                  */
 536
 537                 yaffs_HandleDeferedFree(obj);
 538
 539                 yaffs_GrossUnlock(dev);
 540         }
 541
 542 }
 543
 544 /* delete is called when the link count is zero and the inode
 545  * is put (ie. nobody wants to know about it anymore, time to
 546  * delete the file).
 547  * NB Must call clear_inode()
 548  */
 549 static void yaffs_delete_inode(struct inode *inode)
 550 {
 551         yaffs_Object *obj = yaffs_InodeToObject(inode);
 552         yaffs_Device *dev;
 553
 554         T(YAFFS_TRACE_OS,
 555                 ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 556                 atomic_read(&inode->i_count),
 557                 obj ? "object exists" : "null object"));
 558
 559         if (obj) {
 560                 dev = obj->myDev;
 561                 yaffs_GrossLock(dev);
 562                 yaffs_DeleteObject(obj);
 563                 yaffs_GrossUnlock(dev);
 564         }
 565 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 566         truncate_inode_pages(&inode->i_data, 0);
 567 #endif
 568         clear_inode(inode);
 569 }
 570
 571 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 572 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 573 #else
 574 static int yaffs_file_flush(struct file *file)
 575 #endif
 576 {
 577         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 578
 579         yaffs_Device *dev = obj->myDev;
 580
 581         T(YAFFS_TRACE_OS,
 582                 ("yaffs_file_flush object %d (%s)\n", obj->objectId,
 583                 obj->dirty ? "dirty" : "clean"));
 584
 585         yaffs_GrossLock(dev);
 586
 587         yaffs_FlushFile(obj, 1);
 588
 589         yaffs_GrossUnlock(dev);
 590
 591         return 0;
 592 }
 593
 594 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 595 {
 596         /* Lifted from jffs2 */
 597
 598         yaffs_Object *obj;
 599         unsigned char *pg_buf;
 600         int ret;
 601
 602         yaffs_Device *dev;
 603
 604         T(YAFFS_TRACE_OS, ("yaffs_readpage at %08x, size %08x\n",
 605                         (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 606                         (unsigned)PAGE_CACHE_SIZE));
 607
 608         obj = yaffs_DentryToObject(f->f_dentry);
 609
 610         dev = obj->myDev;
 611
 612 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 613         BUG_ON(!PageLocked(pg));
 614 #else
 615         if (!PageLocked(pg))
 616                 PAGE_BUG(pg);
 617 #endif
 618
 619         pg_buf = kmap(pg);
 620         /* FIXME: Can kmap fail? */
 621
 622         yaffs_GrossLock(dev);
 623
 624         ret = yaffs_ReadDataFromFile(obj, pg_buf,
 625                                 pg->index << PAGE_CACHE_SHIFT,
 626                                 PAGE_CACHE_SIZE);
 627
 628         yaffs_GrossUnlock(dev);
 629
 630         if (ret >= 0)
 631                 ret = 0;
 632
 633         if (ret) {
 634                 ClearPageUptodate(pg);
 635                 SetPageError(pg);
 636         } else {
 637                 SetPageUptodate(pg);
 638                 ClearPageError(pg);
 639         }
 640
 641         flush_dcache_page(pg);
 642         kunmap(pg);
 643
 644         T(YAFFS_TRACE_OS, ("yaffs_readpage done\n"));
 645         return ret;
 646 }
 647
 648 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 649 {
 650         int ret = yaffs_readpage_nolock(f, pg);
 651         UnlockPage(pg);
 652         return ret;
 653 }
 654
 655 static int yaffs_readpage(struct file *f, struct page *pg)
 656 {
 657         return yaffs_readpage_unlock(f, pg);
 658 }
 659
 660 /* writepage inspired by/stolen from smbfs */
 661
 662 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 663 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 664 #else
 665 static int yaffs_writepage(struct page *page)
 666 #endif
 667 {
 668         struct address_space *mapping = page->mapping;
 669         loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
 670         struct inode *inode;
 671         unsigned long end_index;
 672         char *buffer;
 673         yaffs_Object *obj;
 674         int nWritten = 0;
 675         unsigned nBytes;
 676
 677         if (!mapping)
 678                 BUG();
 679         inode = mapping->host;
 680         if (!inode)
 681                 BUG();
 682
 683         if (offset > inode->i_size) {
 684                 T(YAFFS_TRACE_OS,
 685                         ("yaffs_writepage at %08x, inode size = %08x!!!\n",
 686                         (unsigned)(page->index << PAGE_CACHE_SHIFT),
 687                         (unsigned)inode->i_size));
 688                 T(YAFFS_TRACE_OS,
 689                         ("                -> don't care!!\n"));
 690                 unlock_page(page);
 691                 return 0;
 692         }
 693
 694         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 695
 696         /* easy case */
 697         if (page->index < end_index)
 698                 nBytes = PAGE_CACHE_SIZE;
 699         else
 700                 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
 701
 702         get_page(page);
 703
 704         buffer = kmap(page);
 705
 706         obj = yaffs_InodeToObject(inode);
 707         yaffs_GrossLock(obj->myDev);
 708
 709         T(YAFFS_TRACE_OS,
 710                 ("yaffs_writepage at %08x, size %08x\n",
 711                 (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 712         T(YAFFS_TRACE_OS,
 713                 ("writepag0: obj = %05x, ino = %05x\n",
 714                 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 715
 716         nWritten = yaffs_WriteDataToFile(obj, buffer,
 717                         page->index << PAGE_CACHE_SHIFT, nBytes, 0);
 718
 719         T(YAFFS_TRACE_OS,
 720                 ("writepag1: obj = %05x, ino = %05x\n",
 721                 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 722
 723         yaffs_GrossUnlock(obj->myDev);
 724
 725         kunmap(page);
 726         SetPageUptodate(page);
 727         UnlockPage(page);
 728         put_page(page);
 729
 730         return (nWritten == nBytes) ? 0 : -ENOSPC;
 731 }
 732
 733
 734 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 735 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 736                                 loff_t pos, unsigned len, unsigned flags,
 737                                 struct page **pagep, void **fsdata)
 738 {
 739         struct page *pg = NULL;
 740         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
 741         uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
 742         uint32_t to = offset + len;
 743
 744         int ret = 0;
 745         int space_held = 0;
 746
 747         T(YAFFS_TRACE_OS, ("start yaffs_write_begin\n"));
 748         /* Get a page */
 749 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28)
 750         pg = grab_cache_page_write_begin(mapping, index, flags);
 751 #else
 752         pg = __grab_cache_page(mapping, index);
 753 #endif
 754
 755         *pagep = pg;
 756         if (!pg) {
 757                 ret =  -ENOMEM;
 758                 goto out;
 759         }
 760         /* Get fs space */
 761         space_held = yaffs_hold_space(filp);
 762
 763         if (!space_held) {
 764                 ret = -ENOSPC;
 765                 goto out;
 766         }
 767
 768         /* Update page if required */
 769
 770         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 771                 ret = yaffs_readpage_nolock(filp, pg);
 772
 773         if (ret)
 774                 goto out;
 775
 776         /* Happy path return */
 777         T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
 778
 779         return 0;
 780
 781 out:
 782         T(YAFFS_TRACE_OS, ("end yaffs_write_begin fail returning %d\n", ret));
 783         if (space_held)
 784                 yaffs_release_space(filp);
 785         if (pg) {
 786                 unlock_page(pg);
 787                 page_cache_release(pg);
 788         }
 789         return ret;
 790 }
 791
 792 #else
 793
 794 static int yaffs_prepare_write(struct file *f, struct page *pg,
 795                                 unsigned offset, unsigned to)
 796 {
 797         T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n"));
 798
 799         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 800                 return yaffs_readpage_nolock(f, pg);
 801         return 0;
 802 }
 803 #endif
 804
 805 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 806 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 807                                 loff_t pos, unsigned len, unsigned copied,
 808                                 struct page *pg, void *fsdadata)
 809 {
 810         int ret = 0;
 811         void *addr, *kva;
 812         uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
 813
 814         kva = kmap(pg);
 815         addr = kva + offset_into_page;
 816
 817         T(YAFFS_TRACE_OS,
 818                 ("yaffs_write_end addr %x pos %x nBytes %d\n",
 819                 (unsigned) addr,
 820                 (int)pos, copied));
 821
 822         ret = yaffs_file_write(filp, addr, copied, &pos);
 823
 824         if (ret != copied) {
 825                 T(YAFFS_TRACE_OS,
 826                         ("yaffs_write_end not same size ret %d  copied %d\n",
 827                         ret, copied));
 828                 SetPageError(pg);
 829                 ClearPageUptodate(pg);
 830         } else {
 831                 SetPageUptodate(pg);
 832         }
 833
 834         kunmap(pg);
 835
 836         yaffs_release_space(filp);
 837         unlock_page(pg);
 838         page_cache_release(pg);
 839         return ret;
 840 }
 841 #else
 842
 843 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 844                                 unsigned to)
 845 {
 846         void *addr, *kva;
 847
 848         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
 849         int nBytes = to - offset;
 850         int nWritten;
 851
 852         unsigned spos = pos;
 853         unsigned saddr;
 854
 855         kva = kmap(pg);
 856         addr = kva + offset;
 857
 858         saddr = (unsigned) addr;
 859
 860         T(YAFFS_TRACE_OS,
 861                 ("yaffs_commit_write addr %x pos %x nBytes %d\n",
 862                 saddr, spos, nBytes));
 863
 864         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
 865
 866         if (nWritten != nBytes) {
 867                 T(YAFFS_TRACE_OS,
 868                         ("yaffs_commit_write not same size nWritten %d  nBytes %d\n",
 869                         nWritten, nBytes));
 870                 SetPageError(pg);
 871                 ClearPageUptodate(pg);
 872         } else {
 873                 SetPageUptodate(pg);
 874         }
 875
 876         kunmap(pg);
 877
 878         T(YAFFS_TRACE_OS,
 879                 ("yaffs_commit_write returning %d\n",
 880                 nWritten == nBytes ? 0 : nWritten));
 881
 882         return nWritten == nBytes ? 0 : nWritten;
 883 }
 884 #endif
 885
 886
 887 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 888 {
 889         if (inode && obj) {
 890
 891
 892                 /* Check mode against the variant type and attempt to repair if broken. */
 893                 __u32 mode = obj->yst_mode;
 894                 switch (obj->variantType) {
 895                 case YAFFS_OBJECT_TYPE_FILE:
 896                         if (!S_ISREG(mode)) {
 897                                 obj->yst_mode &= ~S_IFMT;
 898                                 obj->yst_mode |= S_IFREG;
 899                         }
 900
 901                         break;
 902                 case YAFFS_OBJECT_TYPE_SYMLINK:
 903                         if (!S_ISLNK(mode)) {
 904                                 obj->yst_mode &= ~S_IFMT;
 905                                 obj->yst_mode |= S_IFLNK;
 906                         }
 907
 908                         break;
 909                 case YAFFS_OBJECT_TYPE_DIRECTORY:
 910                         if (!S_ISDIR(mode)) {
 911                                 obj->yst_mode &= ~S_IFMT;
 912                                 obj->yst_mode |= S_IFDIR;
 913                         }
 914
 915                         break;
 916                 case YAFFS_OBJECT_TYPE_UNKNOWN:
 917                 case YAFFS_OBJECT_TYPE_HARDLINK:
 918                 case YAFFS_OBJECT_TYPE_SPECIAL:
 919                 default:
 920                         /* TODO? */
 921                         break;
 922                 }
 923
 924                 inode->i_flags |= S_NOATIME;
 925
 926                 inode->i_ino = obj->objectId;
 927                 inode->i_mode = obj->yst_mode;
 928                 inode->i_uid = obj->yst_uid;
 929                 inode->i_gid = obj->yst_gid;
 930 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
 931                 inode->i_blksize = inode->i_sb->s_blocksize;
 932 #endif
 933 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 934
 935                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 936                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
 937                 inode->i_atime.tv_nsec = 0;
 938                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
 939                 inode->i_mtime.tv_nsec = 0;
 940                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
 941                 inode->i_ctime.tv_nsec = 0;
 942 #else
 943                 inode->i_rdev = obj->yst_rdev;
 944                 inode->i_atime = obj->yst_atime;
 945                 inode->i_mtime = obj->yst_mtime;
 946                 inode->i_ctime = obj->yst_ctime;
 947 #endif
 948                 inode->i_size = yaffs_GetObjectFileLength(obj);
 949                 inode->i_blocks = (inode->i_size + 511) >> 9;
 950
 951                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 952
 953                 T(YAFFS_TRACE_OS,
 954                         ("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 955                         inode->i_mode, inode->i_uid, inode->i_gid,
 956                         (int)inode->i_size, atomic_read(&inode->i_count)));
 957
 958                 switch (obj->yst_mode & S_IFMT) {
 959                 default:        /* fifo, device or socket */
 960 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 961                         init_special_inode(inode, obj->yst_mode,
 962                                         old_decode_dev(obj->yst_rdev));
 963 #else
 964                         init_special_inode(inode, obj->yst_mode,
 965                                         (dev_t) (obj->yst_rdev));
 966 #endif
 967                         break;
 968                 case S_IFREG:   /* file */
 969                         inode->i_op = &yaffs_file_inode_operations;
 970                         inode->i_fop = &yaffs_file_operations;
 971                         inode->i_mapping->a_ops =
 972                                 &yaffs_file_address_operations;
 973                         break;
 974                 case S_IFDIR:   /* directory */
 975                         inode->i_op = &yaffs_dir_inode_operations;
 976                         inode->i_fop = &yaffs_dir_operations;
 977                         break;
 978                 case S_IFLNK:   /* symlink */
 979                         inode->i_op = &yaffs_symlink_inode_operations;
 980                         break;
 981                 }
 982
 983                 yaffs_InodeToObjectLV(inode) = obj;
 984
 985                 obj->myInode = inode;
 986
 987         } else {
 988                 T(YAFFS_TRACE_OS,
 989                         ("yaffs_FileInode invalid parameters\n"));
 990         }
 991
 992 }
 993
 994 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 995                                 yaffs_Object *obj)
 996 {
 997         struct inode *inode;
 998
 999         if (!sb) {
1000                 T(YAFFS_TRACE_OS,
1001                         ("yaffs_get_inode for NULL super_block!!\n"));
1002                 return NULL;
1003
1004         }
1005
1006         if (!obj) {
1007                 T(YAFFS_TRACE_OS,
1008                         ("yaffs_get_inode for NULL object!!\n"));
1009                 return NULL;
1010
1011         }
1012
1013         T(YAFFS_TRACE_OS,
1014                 ("yaffs_get_inode for object %d\n", obj->objectId));
1015
1016         inode = Y_IGET(sb, obj->objectId);
1017         if (IS_ERR(inode))
1018                 return NULL;
1019
1020         /* NB Side effect: iget calls back to yaffs_read_inode(). */
1021         /* iget also increments the inode's i_count */
1022         /* NB You can't be holding grossLock or deadlock will happen! */
1023
1024         return inode;
1025 }
1026
1027 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1028                                 loff_t *pos)
1029 {
1030         yaffs_Object *obj;
1031         int nWritten, ipos;
1032         struct inode *inode;
1033         yaffs_Device *dev;
1034
1035         obj = yaffs_DentryToObject(f->f_dentry);
1036
1037         dev = obj->myDev;
1038
1039         yaffs_GrossLock(dev);
1040
1041         inode = f->f_dentry->d_inode;
1042
1043         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1044                 ipos = inode->i_size;
1045         else
1046                 ipos = *pos;
1047
1048         if (!obj)
1049                 T(YAFFS_TRACE_OS,
1050                         ("yaffs_file_write: hey obj is null!\n"));
1051         else
1052                 T(YAFFS_TRACE_OS,
1053                         ("yaffs_file_write about to write writing %zu bytes"
1054                         "to object %d at %d\n",
1055                         n, obj->objectId, ipos));
1056
1057         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
1058
1059         T(YAFFS_TRACE_OS,
1060                 ("yaffs_file_write writing %zu bytes, %d written at %d\n",
1061                 n, nWritten, ipos));
1062
1063         if (nWritten > 0) {
1064                 ipos += nWritten;
1065                 *pos = ipos;
1066                 if (ipos > inode->i_size) {
1067                         inode->i_size = ipos;
1068                         inode->i_blocks = (ipos + 511) >> 9;
1069
1070                         T(YAFFS_TRACE_OS,
1071                                 ("yaffs_file_write size updated to %d bytes, "
1072                                 "%d blocks\n",
1073                                 ipos, (int)(inode->i_blocks)));
1074                 }
1075
1076         }
1077         yaffs_GrossUnlock(dev);
1078         return (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
1079 }
1080
1081 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1082 /* For now we just assume few parallel writes and check against a small number. */
1083 /* Todo: need to do this with a counter to handle parallel reads better */
1084
1085 static ssize_t yaffs_hold_space(struct file *f)
1086 {
1087         yaffs_Object *obj;
1088         yaffs_Device *dev;
1089
1090         int nFreeChunks;
1091
1092
1093         obj = yaffs_DentryToObject(f->f_dentry);
1094
1095         dev = obj->myDev;
1096
1097         yaffs_GrossLock(dev);
1098
1099         nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
1100
1101         yaffs_GrossUnlock(dev);
1102
1103         return (nFreeChunks > 20) ? 1 : 0;
1104 }
1105
1106 static void yaffs_release_space(struct file *f)
1107 {
1108         yaffs_Object *obj;
1109         yaffs_Device *dev;
1110
1111
1112         obj = yaffs_DentryToObject(f->f_dentry);
1113
1114         dev = obj->myDev;
1115
1116         yaffs_GrossLock(dev);
1117
1118
1119         yaffs_GrossUnlock(dev);
1120 }
1121
1122 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1123 {
1124         yaffs_Object *obj;
1125         yaffs_Device *dev;
1126         struct inode *inode = f->f_dentry->d_inode;
1127         unsigned long offset, curoffs;
1128         struct ylist_head *i;
1129         yaffs_Object *l;
1130
1131         char name[YAFFS_MAX_NAME_LENGTH + 1];
1132
1133         obj = yaffs_DentryToObject(f->f_dentry);
1134         dev = obj->myDev;
1135
1136         yaffs_GrossLock(dev);
1137
1138         offset = f->f_pos;
1139
1140         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
1141
1142         if (offset == 0) {
1143                 T(YAFFS_TRACE_OS,
1144                         ("yaffs_readdir: entry . ino %d \n",
1145                         (int)inode->i_ino));
1146                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
1147                         goto out;
1148                 offset++;
1149                 f->f_pos++;
1150         }
1151         if (offset == 1) {
1152                 T(YAFFS_TRACE_OS,
1153                         ("yaffs_readdir: entry .. ino %d \n",
1154                         (int)f->f_dentry->d_parent->d_inode->i_ino));
1155                 if (filldir(dirent, "..", 2, offset,
1156                         f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
1157                         goto out;
1158                 offset++;
1159                 f->f_pos++;
1160         }
1161
1162         curoffs = 1;
1163
1164         /* If the directory has changed since the open or last call to
1165            readdir, rewind to after the 2 canned entries. */
1166
1167         if (f->f_version != inode->i_version) {
1168                 offset = 2;
1169                 f->f_pos = offset;
1170                 f->f_version = inode->i_version;
1171         }
1172
1173         ylist_for_each(i, &obj->variant.directoryVariant.children) {
1174                 curoffs++;
1175                 if (curoffs >= offset) {
1176                         l = ylist_entry(i, yaffs_Object, siblings);
1177
1178                         yaffs_GetObjectName(l, name,
1179                                             YAFFS_MAX_NAME_LENGTH + 1);
1180                         T(YAFFS_TRACE_OS,
1181                           ("yaffs_readdir: %s inode %d\n", name,
1182                            yaffs_GetObjectInode(l)));
1183
1184                         if (filldir(dirent,
1185                                         name,
1186                                         strlen(name),
1187                                         offset,
1188                                         yaffs_GetObjectInode(l),
1189                                         yaffs_GetObjectType(l)) < 0)
1190                                 goto up_and_out;
1191
1192                         offset++;
1193                         f->f_pos++;
1194                 }
1195         }
1196
1197 up_and_out:
1198 out:
1199         yaffs_GrossUnlock(dev);
1200
1201         return 0;
1202 }
1203
1204 /*
1205  * File creation. Allocate an inode, and we're done..
1206  */
1207
1208 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1209 #define YCRED(x) x
1210 #else
1211 #define YCRED(x) (x->cred)
1212 #endif
1213
1214 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1215 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1216                         dev_t rdev)
1217 #else
1218 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1219                         int rdev)
1220 #endif
1221 {
1222         struct inode *inode;
1223
1224         yaffs_Object *obj = NULL;
1225         yaffs_Device *dev;
1226
1227         yaffs_Object *parent = yaffs_InodeToObject(dir);
1228
1229         int error = -ENOSPC;
1230         uid_t uid = YCRED(current)->fsuid;
1231         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1232
1233         if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1234                 mode |= S_ISGID;
1235
1236         if (parent) {
1237                 T(YAFFS_TRACE_OS,
1238                         ("yaffs_mknod: parent object %d type %d\n",
1239                         parent->objectId, parent->variantType));
1240         } else {
1241                 T(YAFFS_TRACE_OS,
1242                         ("yaffs_mknod: could not get parent object\n"));
1243                 return -EPERM;
1244         }
1245
1246         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1247                         "mode %x dev %x\n",
1248                         dentry->d_name.name, mode, rdev));
1249
1250         dev = parent->myDev;
1251
1252         yaffs_GrossLock(dev);
1253
1254         switch (mode & S_IFMT) {
1255         default:
1256                 /* Special (socket, fifo, device...) */
1257                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
1258 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1259                 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1260                                 gid, old_encode_dev(rdev));
1261 #else
1262                 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1263                                 gid, rdev);
1264 #endif
1265                 break;
1266         case S_IFREG:           /* file          */
1267                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
1268                 obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1269                                 gid);
1270                 break;
1271         case S_IFDIR:           /* directory */
1272                 T(YAFFS_TRACE_OS,
1273                         ("yaffs_mknod: making directory\n"));
1274                 obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1275                                         uid, gid);
1276                 break;
1277         case S_IFLNK:           /* symlink */
1278                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
1279                 obj = NULL;     /* Do we ever get here? */
1280                 break;
1281         }
1282
1283         /* Can not call yaffs_get_inode() with gross lock held */
1284         yaffs_GrossUnlock(dev);
1285
1286         if (obj) {
1287                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1288                 d_instantiate(dentry, inode);
1289                 T(YAFFS_TRACE_OS,
1290                         ("yaffs_mknod created object %d count = %d\n",
1291                         obj->objectId, atomic_read(&inode->i_count)));
1292                 error = 0;
1293         } else {
1294                 T(YAFFS_TRACE_OS,
1295                         ("yaffs_mknod failed making object\n"));
1296                 error = -ENOMEM;
1297         }
1298
1299         return error;
1300 }
1301
1302 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1303 {
1304         int retVal;
1305         T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
1306         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1307         return retVal;
1308 }
1309
1310 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1311 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1312                         struct nameidata *n)
1313 #else
1314 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1315 #endif
1316 {
1317         T(YAFFS_TRACE_OS, ("yaffs_create\n"));
1318         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1319 }
1320
1321 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1322 {
1323         int retVal;
1324
1325         yaffs_Device *dev;
1326
1327         T(YAFFS_TRACE_OS,
1328                 ("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1329                 dentry->d_name.name));
1330
1331         dev = yaffs_InodeToObject(dir)->myDev;
1332
1333         yaffs_GrossLock(dev);
1334
1335         retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1336
1337         if (retVal == YAFFS_OK) {
1338                 dentry->d_inode->i_nlink--;
1339                 dir->i_version++;
1340                 yaffs_GrossUnlock(dev);
1341                 mark_inode_dirty(dentry->d_inode);
1342                 return 0;
1343         }
1344         yaffs_GrossUnlock(dev);
1345         return -ENOTEMPTY;
1346 }
1347
1348 /*
1349  * Create a link...
1350  */
1351 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1352                         struct dentry *dentry)
1353 {
1354         struct inode *inode = old_dentry->d_inode;
1355         yaffs_Object *obj = NULL;
1356         yaffs_Object *link = NULL;
1357         yaffs_Device *dev;
1358
1359         T(YAFFS_TRACE_OS, ("yaffs_link\n"));
1360
1361         obj = yaffs_InodeToObject(inode);
1362         dev = obj->myDev;
1363
1364         yaffs_GrossLock(dev);
1365
1366         if (!S_ISDIR(inode->i_mode))            /* Don't link directories */
1367                 link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1368                         obj);
1369
1370         if (link) {
1371                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1372                 d_instantiate(dentry, old_dentry->d_inode);
1373                 atomic_inc(&old_dentry->d_inode->i_count);
1374                 T(YAFFS_TRACE_OS,
1375                         ("yaffs_link link count %d i_count %d\n",
1376                         old_dentry->d_inode->i_nlink,
1377                         atomic_read(&old_dentry->d_inode->i_count)));
1378         }
1379
1380         yaffs_GrossUnlock(dev);
1381
1382         if (link)
1383                 return 0;
1384
1385         return -EPERM;
1386 }
1387
1388 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1389                                 const char *symname)
1390 {
1391         yaffs_Object *obj;
1392         yaffs_Device *dev;
1393         uid_t uid = YCRED(current)->fsuid;
1394         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1395
1396         T(YAFFS_TRACE_OS, ("yaffs_symlink\n"));
1397
1398         dev = yaffs_InodeToObject(dir)->myDev;
1399         yaffs_GrossLock(dev);
1400         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1401                                 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1402         yaffs_GrossUnlock(dev);
1403
1404         if (obj) {
1405                 struct inode *inode;
1406
1407                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1408                 d_instantiate(dentry, inode);
1409                 T(YAFFS_TRACE_OS, ("symlink created OK\n"));
1410                 return 0;
1411         } else {
1412                 T(YAFFS_TRACE_OS, ("symlink not created\n"));
1413         }
1414
1415         return -ENOMEM;
1416 }
1417
1418 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1419                                 int datasync)
1420 {
1421
1422         yaffs_Object *obj;
1423         yaffs_Device *dev;
1424
1425         obj = yaffs_DentryToObject(dentry);
1426
1427         dev = obj->myDev;
1428
1429         T(YAFFS_TRACE_OS, ("yaffs_sync_object\n"));
1430         yaffs_GrossLock(dev);
1431         yaffs_FlushFile(obj, 1);
1432         yaffs_GrossUnlock(dev);
1433         return 0;
1434 }
1435
1436 /*
1437  * The VFS layer already does all the dentry stuff for rename.
1438  *
1439  * NB: POSIX says you can rename an object over an old object of the same name
1440  */
1441 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1442                         struct inode *new_dir, struct dentry *new_dentry)
1443 {
1444         yaffs_Device *dev;
1445         int retVal = YAFFS_FAIL;
1446         yaffs_Object *target;
1447
1448         T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
1449         dev = yaffs_InodeToObject(old_dir)->myDev;
1450
1451         yaffs_GrossLock(dev);
1452
1453         /* Check if the target is an existing directory that is not empty. */
1454         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1455                                 new_dentry->d_name.name);
1456
1457
1458
1459         if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1460                 !ylist_empty(&target->variant.directoryVariant.children)) {
1461
1462                 T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
1463
1464                 retVal = YAFFS_FAIL;
1465         } else {
1466                 /* Now does unlinking internally using shadowing mechanism */
1467                 T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
1468
1469                 retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1470                                 old_dentry->d_name.name,
1471                                 yaffs_InodeToObject(new_dir),
1472                                 new_dentry->d_name.name);
1473         }
1474         yaffs_GrossUnlock(dev);
1475
1476         if (retVal == YAFFS_OK) {
1477                 if (target) {
1478                         new_dentry->d_inode->i_nlink--;
1479                         mark_inode_dirty(new_dentry->d_inode);
1480                 }
1481
1482                 return 0;
1483         } else {
1484                 return -ENOTEMPTY;
1485         }
1486 }
1487
1488 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1489 {
1490         struct inode *inode = dentry->d_inode;
1491         int error;
1492         yaffs_Device *dev;
1493
1494         T(YAFFS_TRACE_OS,
1495                 ("yaffs_setattr of object %d\n",
1496                 yaffs_InodeToObject(inode)->objectId));
1497
1498         error = inode_change_ok(inode, attr);
1499         if (error == 0) {
1500                 dev = yaffs_InodeToObject(inode)->myDev;
1501                 yaffs_GrossLock(dev);
1502                 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1503                                 YAFFS_OK) {
1504                         error = 0;
1505                 } else {
1506                         error = -EPERM;
1507                 }
1508                 yaffs_GrossUnlock(dev);
1509                 if (!error)
1510                         error = inode_setattr(inode, attr);
1511         }
1512         return error;
1513 }
1514
1515 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1516 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1517 {
1518         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1519         struct super_block *sb = dentry->d_sb;
1520 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1521 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1522 {
1523         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1524 #else
1525 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1526 {
1527         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1528 #endif
1529
1530         T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
1531
1532         yaffs_GrossLock(dev);
1533
1534         buf->f_type = YAFFS_MAGIC;
1535         buf->f_bsize = sb->s_blocksize;
1536         buf->f_namelen = 255;
1537
1538         if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
1539                 /* Do this if chunk size is not a power of 2 */
1540
1541                 uint64_t bytesInDev;
1542                 uint64_t bytesFree;
1543
1544                 bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock + 1))) *
1545                         ((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk));
1546
1547                 do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
1548                 buf->f_blocks = bytesInDev;
1549
1550                 bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
1551                         ((uint64_t)(dev->nDataBytesPerChunk));
1552
1553                 do_div(bytesFree, sb->s_blocksize);
1554
1555                 buf->f_bfree = bytesFree;
1556
1557         } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1558
1559                 buf->f_blocks =
1560                         (dev->endBlock - dev->startBlock + 1) *
1561                         dev->nChunksPerBlock /
1562                         (sb->s_blocksize / dev->nDataBytesPerChunk);
1563                 buf->f_bfree =
1564                         yaffs_GetNumberOfFreeChunks(dev) /
1565                         (sb->s_blocksize / dev->nDataBytesPerChunk);
1566         } else {
1567                 buf->f_blocks =
1568                         (dev->endBlock - dev->startBlock + 1) *
1569                         dev->nChunksPerBlock *
1570                         (dev->nDataBytesPerChunk / sb->s_blocksize);
1571
1572                 buf->f_bfree =
1573                         yaffs_GetNumberOfFreeChunks(dev) *
1574                         (dev->nDataBytesPerChunk / sb->s_blocksize);
1575         }
1576
1577         buf->f_files = 0;
1578         buf->f_ffree = 0;
1579         buf->f_bavail = buf->f_bfree;
1580
1581         yaffs_GrossUnlock(dev);
1582         return 0;
1583 }
1584
1585
1586 static int yaffs_do_sync_fs(struct super_block *sb)
1587 {
1588
1589         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1590         T(YAFFS_TRACE_OS, ("yaffs_do_sync_fs\n"));
1591
1592         if (sb->s_dirt) {
1593                 yaffs_GrossLock(dev);
1594
1595                 if (dev) {
1596                         yaffs_FlushEntireDeviceCache(dev);
1597                         yaffs_CheckpointSave(dev);
1598                 }
1599
1600                 yaffs_GrossUnlock(dev);
1601
1602                 sb->s_dirt = 0;
1603         }
1604         return 0;
1605 }
1606
1607
1608 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1609 static void yaffs_write_super(struct super_block *sb)
1610 #else
1611 static int yaffs_write_super(struct super_block *sb)
1612 #endif
1613 {
1614
1615         T(YAFFS_TRACE_OS, ("yaffs_write_super\n"));
1616         if (yaffs_auto_checkpoint >= 2)
1617                 yaffs_do_sync_fs(sb);
1618 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
1619         return 0;
1620 #endif
1621 }
1622
1623
1624 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1625 static int yaffs_sync_fs(struct super_block *sb, int wait)
1626 #else
1627 static int yaffs_sync_fs(struct super_block *sb)
1628 #endif
1629 {
1630         T(YAFFS_TRACE_OS, ("yaffs_sync_fs\n"));
1631
1632         if (yaffs_auto_checkpoint >= 1)
1633                 yaffs_do_sync_fs(sb);
1634
1635         return 0;
1636 }
1637
1638 #ifdef YAFFS_USE_OWN_IGET
1639
1640 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
1641 {
1642         struct inode *inode;
1643         yaffs_Object *obj;
1644         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1645
1646         T(YAFFS_TRACE_OS,
1647                 ("yaffs_iget for %lu\n", ino));
1648
1649         inode = iget_locked(sb, ino);
1650         if (!inode)
1651                 return ERR_PTR(-ENOMEM);
1652         if (!(inode->i_state & I_NEW))
1653                 return inode;
1654
1655         /* NB This is called as a side effect of other functions, but
1656          * we had to release the lock to prevent deadlocks, so
1657          * need to lock again.
1658          */
1659
1660         yaffs_GrossLock(dev);
1661
1662         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1663
1664         yaffs_FillInodeFromObject(inode, obj);
1665
1666         yaffs_GrossUnlock(dev);
1667
1668         unlock_new_inode(inode);
1669         return inode;
1670 }
1671
1672 #else
1673
1674 static void yaffs_read_inode(struct inode *inode)
1675 {
1676         /* NB This is called as a side effect of other functions, but
1677          * we had to release the lock to prevent deadlocks, so
1678          * need to lock again.
1679          */
1680
1681         yaffs_Object *obj;
1682         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1683
1684         T(YAFFS_TRACE_OS,
1685                 ("yaffs_read_inode for %d\n", (int)inode->i_ino));
1686
1687         yaffs_GrossLock(dev);
1688
1689         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1690
1691         yaffs_FillInodeFromObject(inode, obj);
1692
1693         yaffs_GrossUnlock(dev);
1694 }
1695
1696 #endif
1697
1698 static YLIST_HEAD(yaffs_dev_list);
1699
1700 #if 0 /* not used */
1701 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1702 {
1703         yaffs_Device    *dev = yaffs_SuperToDevice(sb);
1704
1705         if (*flags & MS_RDONLY) {
1706                 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1707
1708                 T(YAFFS_TRACE_OS,
1709                         ("yaffs_remount_fs: %s: RO\n", dev->name));
1710
1711                 yaffs_GrossLock(dev);
1712
1713                 yaffs_FlushEntireDeviceCache(dev);
1714
1715                 yaffs_CheckpointSave(dev);
1716
1717                 if (mtd->sync)
1718                         mtd->sync(mtd);
1719
1720                 yaffs_GrossUnlock(dev);
1721         } else {
1722                 T(YAFFS_TRACE_OS,
1723                         ("yaffs_remount_fs: %s: RW\n", dev->name));
1724         }
1725
1726         return 0;
1727 }
1728 #endif
1729
1730 static void yaffs_put_super(struct super_block *sb)
1731 {
1732         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1733
1734         T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
1735
1736         yaffs_GrossLock(dev);
1737
1738         yaffs_FlushEntireDeviceCache(dev);
1739
1740         yaffs_CheckpointSave(dev);
1741
1742         if (dev->putSuperFunc)
1743                 dev->putSuperFunc(sb);
1744
1745         yaffs_Deinitialise(dev);
1746
1747         yaffs_GrossUnlock(dev);
1748
1749         /* we assume this is protected by lock_kernel() in mount/umount */
1750         ylist_del(&dev->devList);
1751
1752         if (dev->spareBuffer) {
1753                 YFREE(dev->spareBuffer);
1754                 dev->spareBuffer = NULL;
1755         }
1756
1757         kfree(dev);
1758 }
1759
1760
1761 static void yaffs_MTDPutSuper(struct super_block *sb)
1762 {
1763         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1764
1765         if (mtd->sync)
1766                 mtd->sync(mtd);
1767
1768         put_mtd_device(mtd);
1769 }
1770
1771
1772 static void yaffs_MarkSuperBlockDirty(void *vsb)
1773 {
1774         struct super_block *sb = (struct super_block *)vsb;
1775
1776         T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb));
1777         if (sb)
1778                 sb->s_dirt = 1;
1779 }
1780
1781 typedef struct {
1782         int inband_tags;
1783         int skip_checkpoint_read;
1784         int skip_checkpoint_write;
1785         int no_cache;
1786 } yaffs_options;
1787
1788 #define MAX_OPT_LEN 20
1789 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1790 {
1791         char cur_opt[MAX_OPT_LEN + 1];
1792         int p;
1793         int error = 0;
1794
1795         /* Parse through the options which is a comma seperated list */
1796
1797         while (options_str && *options_str && !error) {
1798                 memset(cur_opt, 0, MAX_OPT_LEN + 1);
1799                 p = 0;
1800
1801                 while (*options_str && *options_str != ',') {
1802                         if (p < MAX_OPT_LEN) {
1803                                 cur_opt[p] = *options_str;
1804                                 p++;
1805                         }
1806                         options_str++;
1807                 }
1808
1809                 if (!strcmp(cur_opt, "inband-tags"))
1810                         options->inband_tags = 1;
1811                 else if (!strcmp(cur_opt, "no-cache"))
1812                         options->no_cache = 1;
1813                 else if (!strcmp(cur_opt, "no-checkpoint-read"))
1814                         options->skip_checkpoint_read = 1;
1815                 else if (!strcmp(cur_opt, "no-checkpoint-write"))
1816                         options->skip_checkpoint_write = 1;
1817                 else if (!strcmp(cur_opt, "no-checkpoint")) {
1818                         options->skip_checkpoint_read = 1;
1819                         options->skip_checkpoint_write = 1;
1820                 } else {
1821                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
1822                                         cur_opt);
1823                         error = 1;
1824                 }
1825         }
1826
1827         return error;
1828 }
1829
1830 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1831                                                 struct super_block *sb,
1832                                                 void *data, int silent)
1833 {
1834         int nBlocks;
1835         struct inode *inode = NULL;
1836         struct dentry *root;
1837         yaffs_Device *dev = 0;
1838         char devname_buf[BDEVNAME_SIZE + 1];
1839         struct mtd_info *mtd;
1840         int err;
1841         char *data_str = (char *)data;
1842
1843         yaffs_options options;
1844
1845         sb->s_magic = YAFFS_MAGIC;
1846         sb->s_op = &yaffs_super_ops;
1847         sb->s_flags |= MS_NOATIME;
1848
1849         if (!sb)
1850                 printk(KERN_INFO "yaffs: sb is NULL\n");
1851         else if (!sb->s_dev)
1852                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1853         else if (!yaffs_devname(sb, devname_buf))
1854                 printk(KERN_INFO "yaffs: devname is NULL\n");
1855         else
1856                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1857                        sb->s_dev,
1858                        yaffs_devname(sb, devname_buf));
1859
1860         if (!data_str)
1861                 data_str = "";
1862
1863         printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
1864
1865         memset(&options, 0, sizeof(options));
1866
1867         if (yaffs_parse_options(&options, data_str)) {
1868                 /* Option parsing failed */
1869                 return NULL;
1870         }
1871
1872
1873         sb->s_blocksize = PAGE_CACHE_SIZE;
1874         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1875         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1876         T(YAFFS_TRACE_OS,
1877           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1878
1879 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1880         T(YAFFS_TRACE_OS,
1881           ("yaffs: Write verification disabled. All guarantees "
1882            "null and void\n"));
1883 #endif
1884
1885         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1886                                "\"%s\"\n",
1887                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
1888                                yaffs_devname(sb, devname_buf)));
1889
1890         /* Check it's an mtd device..... */
1891         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1892                 return NULL;    /* This isn't an mtd device */
1893
1894         /* Get the device */
1895         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1896         if (!mtd) {
1897                 T(YAFFS_TRACE_ALWAYS,
1898                   ("yaffs: MTD device #%u doesn't appear to exist\n",
1899                    MINOR(sb->s_dev)));
1900                 return NULL;
1901         }
1902         /* Check it's NAND */
1903         if (mtd->type != MTD_NANDFLASH) {
1904                 T(YAFFS_TRACE_ALWAYS,
1905                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1906                 return NULL;
1907         }
1908
1909         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1910         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1911         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1912         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1913         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1914         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1915         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1916         T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1917         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1918         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1919 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1920         T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
1921 #else
1922         T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
1923 #endif
1924
1925 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1926
1927         if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
1928                 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
1929                 yaffsVersion = 2;
1930         }
1931
1932         /* Added NCB 26/5/2006 for completeness */
1933         if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
1934                 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
1935                 yaffsVersion = 1;
1936         }
1937
1938 #endif
1939
1940         if (yaffsVersion == 2) {
1941                 /* Check for version 2 style functions */
1942                 if (!mtd->erase ||
1943                     !mtd->block_isbad ||
1944                     !mtd->block_markbad ||
1945                     !mtd->read ||
1946                     !mtd->write ||
1947 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1948                     !mtd->read_oob || !mtd->write_oob) {
1949 #else
1950                     !mtd->write_ecc ||
1951                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1952 #endif
1953                         T(YAFFS_TRACE_ALWAYS,
1954                           ("yaffs: MTD device does not support required "
1955                            "functions\n"));;
1956                         return NULL;
1957                 }
1958
1959                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1960                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
1961                     !options.inband_tags) {
1962                         T(YAFFS_TRACE_ALWAYS,
1963                           ("yaffs: MTD device does not have the "
1964                            "right page sizes\n"));
1965                         return NULL;
1966                 }
1967         } else {
1968                 /* Check for V1 style functions */
1969                 if (!mtd->erase ||
1970                     !mtd->read ||
1971                     !mtd->write ||
1972 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1973                     !mtd->read_oob || !mtd->write_oob) {
1974 #else
1975                     !mtd->write_ecc ||
1976                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1977 #endif
1978                         T(YAFFS_TRACE_ALWAYS,
1979                           ("yaffs: MTD device does not support required "
1980                            "functions\n"));;
1981                         return NULL;
1982                 }
1983
1984                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
1985                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1986                         T(YAFFS_TRACE_ALWAYS,
1987                           ("yaffs: MTD device does not support have the "
1988                            "right page sizes\n"));
1989                         return NULL;
1990                 }
1991         }
1992
1993         /* OK, so if we got here, we have an MTD that's NAND and looks
1994          * like it has the right capabilities
1995          * Set the yaffs_Device up for mtd
1996          */
1997
1998 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1999         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2000 #else
2001         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2002 #endif
2003         if (!dev) {
2004                 /* Deep shit could not allocate device structure */
2005                 T(YAFFS_TRACE_ALWAYS,
2006                   ("yaffs_read_super: Failed trying to allocate "
2007                    "yaffs_Device. \n"));
2008                 return NULL;
2009         }
2010
2011         memset(dev, 0, sizeof(yaffs_Device));
2012         dev->genericDevice = mtd;
2013         dev->name = mtd->name;
2014
2015         /* Set up the memory size parameters.... */
2016
2017         nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2018
2019         dev->startBlock = 0;
2020         dev->endBlock = nBlocks - 1;
2021         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
2022         dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
2023         dev->nReservedBlocks = 5;
2024         dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
2025         dev->inbandTags = options.inband_tags;
2026
2027         /* ... and the functions. */
2028         if (yaffsVersion == 2) {
2029                 dev->writeChunkWithTagsToNAND =
2030                     nandmtd2_WriteChunkWithTagsToNAND;
2031                 dev->readChunkWithTagsFromNAND =
2032                     nandmtd2_ReadChunkWithTagsFromNAND;
2033                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
2034                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
2035                 dev->spareBuffer = YMALLOC(mtd->oobsize);
2036                 dev->isYaffs2 = 1;
2037 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2038                 dev->totalBytesPerChunk = mtd->writesize;
2039                 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
2040 #else
2041                 dev->totalBytesPerChunk = mtd->oobblock;
2042                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
2043 #endif
2044                 nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2045
2046                 dev->startBlock = 0;
2047                 dev->endBlock = nBlocks - 1;
2048         } else {
2049 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2050                 /* use the MTD interface in yaffs_mtdif1.c */
2051                 dev->writeChunkWithTagsToNAND =
2052                         nandmtd1_WriteChunkWithTagsToNAND;
2053                 dev->readChunkWithTagsFromNAND =
2054                         nandmtd1_ReadChunkWithTagsFromNAND;
2055                 dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
2056                 dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
2057 #else
2058                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
2059                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
2060 #endif
2061                 dev->isYaffs2 = 0;
2062         }
2063         /* ... and common functions */
2064         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
2065         dev->initialiseNAND = nandmtd_InitialiseNAND;
2066
2067         dev->putSuperFunc = yaffs_MTDPutSuper;
2068
2069         dev->superBlock = (void *)sb;
2070         dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
2071
2072
2073 #ifndef CONFIG_YAFFS_DOES_ECC
2074         dev->useNANDECC = 1;
2075 #endif
2076
2077 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2078         dev->wideTnodesDisabled = 1;
2079 #endif
2080
2081         dev->skipCheckpointRead = options.skip_checkpoint_read;
2082         dev->skipCheckpointWrite = options.skip_checkpoint_write;
2083
2084         /* we assume this is protected by lock_kernel() in mount/umount */
2085         ylist_add_tail(&dev->devList, &yaffs_dev_list);
2086
2087         init_MUTEX(&dev->grossLock);
2088
2089         yaffs_GrossLock(dev);
2090
2091         err = yaffs_GutsInitialise(dev);
2092
2093         T(YAFFS_TRACE_OS,
2094           ("yaffs_read_super: guts initialised %s\n",
2095            (err == YAFFS_OK) ? "OK" : "FAILED"));
2096
2097         /* Release lock before yaffs_get_inode() */
2098         yaffs_GrossUnlock(dev);
2099
2100         /* Create root inode */
2101         if (err == YAFFS_OK)
2102                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
2103                                         yaffs_Root(dev));
2104
2105         if (!inode)
2106                 return NULL;
2107
2108         inode->i_op = &yaffs_dir_inode_operations;
2109         inode->i_fop = &yaffs_dir_operations;
2110
2111         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
2112
2113         root = d_alloc_root(inode);
2114
2115         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
2116
2117         if (!root) {
2118                 iput(inode);
2119                 return NULL;
2120         }
2121         sb->s_root = root;
2122         sb->s_dirt = !dev->isCheckpointed;
2123         T(YAFFS_TRACE_ALWAYS,
2124           ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
2125
2126         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
2127         return sb;
2128 }
2129
2130
2131 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2132 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2133                                          int silent)
2134 {
2135         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2136 }
2137
2138 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2139 static int yaffs_read_super(struct file_system_type *fs,
2140                             int flags, const char *dev_name,
2141                             void *data, struct vfsmount *mnt)
2142 {
2143
2144         return get_sb_bdev(fs, flags, dev_name, data,
2145                            yaffs_internal_read_super_mtd, mnt);
2146 }
2147 #else
2148 static struct super_block *yaffs_read_super(struct file_system_type *fs,
2149                                             int flags, const char *dev_name,
2150                                             void *data)
2151 {
2152
2153         return get_sb_bdev(fs, flags, dev_name, data,
2154                            yaffs_internal_read_super_mtd);
2155 }
2156 #endif
2157
2158 static struct file_system_type yaffs_fs_type = {
2159         .owner = THIS_MODULE,
2160         .name = "yaffs",
2161         .get_sb = yaffs_read_super,
2162         .kill_sb = kill_block_super,
2163         .fs_flags = FS_REQUIRES_DEV,
2164 };
2165 #else
2166 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
2167                                             int silent)
2168 {
2169         return yaffs_internal_read_super(1, sb, data, silent);
2170 }
2171
2172 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
2173                       FS_REQUIRES_DEV);
2174 #endif
2175
2176
2177 #ifdef CONFIG_YAFFS_YAFFS2
2178
2179 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2180 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2181                                           int silent)
2182 {
2183         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2184 }
2185
2186 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2187 static int yaffs2_read_super(struct file_system_type *fs,
2188                         int flags, const char *dev_name, void *data,
2189                         struct vfsmount *mnt)
2190 {
2191         return get_sb_bdev(fs, flags, dev_name, data,
2192                         yaffs2_internal_read_super_mtd, mnt);
2193 }
2194 #else
2195 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
2196                                              int flags, const char *dev_name,
2197                                              void *data)
2198 {
2199
2200         return get_sb_bdev(fs, flags, dev_name, data,
2201                            yaffs2_internal_read_super_mtd);
2202 }
2203 #endif
2204
2205 static struct file_system_type yaffs2_fs_type = {
2206         .owner = THIS_MODULE,
2207         .name = "yaffs2",
2208         .get_sb = yaffs2_read_super,
2209         .kill_sb = kill_block_super,
2210         .fs_flags = FS_REQUIRES_DEV,
2211 };
2212 #else
2213 static struct super_block *yaffs2_read_super(struct super_block *sb,
2214                                              void *data, int silent)
2215 {
2216         return yaffs_internal_read_super(2, sb, data, silent);
2217 }
2218
2219 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
2220                       FS_REQUIRES_DEV);
2221 #endif
2222
2223 #endif                          /* CONFIG_YAFFS_YAFFS2 */
2224
2225 static struct proc_dir_entry *my_proc_entry;
2226
2227 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
2228 {
2229         buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
2230         buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
2231         buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
2232         buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
2233         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
2234         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
2235         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
2236         buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
2237         buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2238         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2239         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2240         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2241         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2242         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2243         buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
2244         buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
2245         buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
2246         buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
2247         buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
2248         buf += sprintf(buf, "passiveGCs......... %d\n",
2249                     dev->passiveGarbageCollections);
2250         buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
2251         buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
2252         buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
2253         buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
2254         buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
2255         buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
2256         buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
2257         buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
2258         buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
2259         buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
2260         buf +=
2261             sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
2262         buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
2263         buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
2264         buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);
2265
2266         return buf;
2267 }
2268
2269 static int yaffs_proc_read(char *page,
2270                            char **start,
2271                            off_t offset, int count, int *eof, void *data)
2272 {
2273         struct ylist_head *item;
2274         char *buf = page;
2275         int step = offset;
2276         int n = 0;
2277
2278         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2279          * We use 'offset' (*ppos) to indicate where we are in devList.
2280          * This also assumes the user has posted a read buffer large
2281          * enough to hold the complete output; but that's life in /proc.
2282          */
2283
2284         *(int *)start = 1;
2285
2286         /* Print header first */
2287         if (step == 0) {
2288                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2289                                "\n%s\n%s\n", yaffs_fs_c_version,
2290                                yaffs_guts_c_version);
2291         }
2292
2293         /* hold lock_kernel while traversing yaffs_dev_list */
2294         lock_kernel();
2295
2296         /* Locate and print the Nth entry.  Order N-squared but N is small. */
2297         ylist_for_each(item, &yaffs_dev_list) {
2298                 yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
2299                 if (n < step) {
2300                         n++;
2301                         continue;
2302                 }
2303                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2304                 buf = yaffs_dump_dev(buf, dev);
2305                 break;
2306         }
2307         unlock_kernel();
2308
2309         return buf - page < count ? buf - page : count;
2310 }
2311
2312 /**
2313  * Set the verbosity of the warnings and error messages.
2314  *
2315  * Note that the names can only be a..z or _ with the current code.
2316  */
2317
2318 static struct {
2319         char *mask_name;
2320         unsigned mask_bitfield;
2321 } mask_flags[] = {
2322         {"allocate", YAFFS_TRACE_ALLOCATE},
2323         {"always", YAFFS_TRACE_ALWAYS},
2324         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2325         {"buffers", YAFFS_TRACE_BUFFERS},
2326         {"bug", YAFFS_TRACE_BUG},
2327         {"checkpt", YAFFS_TRACE_CHECKPOINT},
2328         {"deletion", YAFFS_TRACE_DELETION},
2329         {"erase", YAFFS_TRACE_ERASE},
2330         {"error", YAFFS_TRACE_ERROR},
2331         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2332         {"gc", YAFFS_TRACE_GC},
2333         {"mtd", YAFFS_TRACE_MTD},
2334         {"nandaccess", YAFFS_TRACE_NANDACCESS},
2335         {"os", YAFFS_TRACE_OS},
2336         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2337         {"scan", YAFFS_TRACE_SCAN},
2338         {"tracing", YAFFS_TRACE_TRACING},
2339
2340         {"verify", YAFFS_TRACE_VERIFY},
2341         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2342         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2343         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2344
2345         {"write", YAFFS_TRACE_WRITE},
2346         {"all", 0xffffffff},
2347         {"none", 0},
2348         {NULL, 0},
2349 };
2350
2351 #define MAX_MASK_NAME_LENGTH 40
2352 static int yaffs_proc_write(struct file *file, const char *buf,
2353                                          unsigned long count, void *data)
2354 {
2355         unsigned rg = 0, mask_bitfield;
2356         char *end;
2357         char *mask_name;
2358         const char *x;
2359         char substring[MAX_MASK_NAME_LENGTH + 1];
2360         int i;
2361         int done = 0;
2362         int add, len = 0;
2363         int pos = 0;
2364
2365         rg = yaffs_traceMask;
2366
2367         while (!done && (pos < count)) {
2368                 done = 1;
2369                 while ((pos < count) && isspace(buf[pos]))
2370                         pos++;
2371
2372                 switch (buf[pos]) {
2373                 case '+':
2374                 case '-':
2375                 case '=':
2376                         add = buf[pos];
2377                         pos++;
2378                         break;
2379
2380                 default:
2381                         add = ' ';
2382                         break;
2383                 }
2384                 mask_name = NULL;
2385
2386                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2387
2388                 if (end > buf + pos) {
2389                         mask_name = "numeral";
2390                         len = end - (buf + pos);
2391                         pos += len;
2392                         done = 0;
2393                 } else {
2394                         for (x = buf + pos, i = 0;
2395                             (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
2396                             i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2397                                 substring[i] = *x;
2398                         substring[i] = '\0';
2399
2400                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2401                                 if (strcmp(substring, mask_flags[i].mask_name) == 0) {
2402                                         mask_name = mask_flags[i].mask_name;
2403                                         mask_bitfield = mask_flags[i].mask_bitfield;
2404                                         done = 0;
2405                                         break;
2406                                 }
2407                         }
2408                 }
2409
2410                 if (mask_name != NULL) {
2411                         done = 0;
2412                         switch (add) {
2413                         case '-':
2414                                 rg &= ~mask_bitfield;
2415                                 break;
2416                         case '+':
2417                                 rg |= mask_bitfield;
2418                                 break;
2419                         case '=':
2420                                 rg = mask_bitfield;
2421                                 break;
2422                         default:
2423                                 rg |= mask_bitfield;
2424                                 break;
2425                         }
2426                 }
2427         }
2428
2429         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2430
2431         printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
2432
2433         if (rg & YAFFS_TRACE_ALWAYS) {
2434                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2435                         char flag;
2436                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2437                         printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
2438                 }
2439         }
2440
2441         return count;
2442 }
2443
2444 /* Stuff to handle installation of file systems */
2445 struct file_system_to_install {
2446         struct file_system_type *fst;
2447         int installed;
2448 };
2449
2450 static struct file_system_to_install fs_to_install[] = {
2451         {&yaffs_fs_type, 0},
2452         {&yaffs2_fs_type, 0},
2453         {NULL, 0}
2454 };
2455
2456 static int __init init_yaffs_fs(void)
2457 {
2458         int error = 0;
2459         struct file_system_to_install *fsinst;
2460
2461         T(YAFFS_TRACE_ALWAYS,
2462           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2463
2464         /* Install the proc_fs entry */
2465         my_proc_entry = create_proc_entry("yaffs",
2466                                                S_IRUGO | S_IFREG,
2467                                                YPROC_ROOT);
2468
2469         if (my_proc_entry) {
2470                 my_proc_entry->write_proc = yaffs_proc_write;
2471                 my_proc_entry->read_proc = yaffs_proc_read;
2472                 my_proc_entry->data = NULL;
2473         } else
2474                 return -ENOMEM;
2475
2476         /* Now add the file system entries */
2477
2478         fsinst = fs_to_install;
2479
2480         while (fsinst->fst && !error) {
2481                 error = register_filesystem(fsinst->fst);
2482                 if (!error)
2483                         fsinst->installed = 1;
2484                 fsinst++;
2485         }
2486
2487         /* Any errors? uninstall  */
2488         if (error) {
2489                 fsinst = fs_to_install;
2490
2491                 while (fsinst->fst) {
2492                         if (fsinst->installed) {
2493                                 unregister_filesystem(fsinst->fst);
2494                                 fsinst->installed = 0;
2495                         }
2496                         fsinst++;
2497                 }
2498         }
2499
2500         return error;
2501 }
2502
2503 static void __exit exit_yaffs_fs(void)
2504 {
2505
2506         struct file_system_to_install *fsinst;
2507
2508         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2509                                " removing. \n"));
2510
2511         remove_proc_entry("yaffs", YPROC_ROOT);
2512
2513         fsinst = fs_to_install;
2514
2515         while (fsinst->fst) {
2516                 if (fsinst->installed) {
2517                         unregister_filesystem(fsinst->fst);
2518                         fsinst->installed = 0;
2519                 }
2520                 fsinst++;
2521         }
2522 }
2523
2524 module_init(init_yaffs_fs)
2525 module_exit(exit_yaffs_fs)
2526
2527 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2528 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2529 MODULE_LICENSE("GPL");