yaffs_fs.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  * Acknowledgements:
   9  * Luc van OostenRyck for numerous patches.
  10  * Nick Bane for numerous patches.
  11  * Nick Bane for 2.5/2.6 integration.
  12  * Andras Toth for mknod rdev issue.
  13  * Michael Fischer for finding the problem with inode inconsistency.
  14  * Some code bodily lifted from JFFS
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 /*
  22  *
  23  * This is the file system front-end to YAFFS that hooks it up to
  24  * the VFS.
  25  *
  26  * Special notes:
  27  * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
  28  *         this superblock
  29  * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this
  30  *         superblock
  31  * >> inode->u.generic_ip points to the associated yaffs_Object.
  32  */
  33
  34 const char *yaffs_fs_c_version =
  35     "$Id: yaffs_fs.c,v 1.77 2009-03-09 07:25:09 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         /*      return (ERR_PTR(-EIO)); */
 493
 494 }
 495
 496
 497 #ifdef YAFFS_HAS_PUT_INODE
 498
 499 /* For now put inode is just for debugging
 500  * Put inode is called when the inode **structure** is put.
 501  */
 502 static void yaffs_put_inode(struct inode *inode)
 503 {
 504         T(YAFFS_TRACE_OS,
 505                 ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 506                 atomic_read(&inode->i_count)));
 507
 508 }
 509 #endif
 510
 511 /* clear is called to tell the fs to release any per-inode data it holds */
 512 static void yaffs_clear_inode(struct inode *inode)
 513 {
 514         yaffs_Object *obj;
 515         yaffs_Device *dev;
 516
 517         obj = yaffs_InodeToObject(inode);
 518
 519         T(YAFFS_TRACE_OS,
 520                 ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 521                 atomic_read(&inode->i_count),
 522                 obj ? "object exists" : "null object"));
 523
 524         if (obj) {
 525                 dev = obj->myDev;
 526                 yaffs_GrossLock(dev);
 527
 528                 /* Clear the association between the inode and
 529                  * the yaffs_Object.
 530                  */
 531                 obj->myInode = NULL;
 532                 yaffs_InodeToObjectLV(inode) = NULL;
 533
 534                 /* If the object freeing was deferred, then the real
 535                  * free happens now.
 536                  * This should fix the inode inconsistency problem.
 537                  */
 538
 539                 yaffs_HandleDeferedFree(obj);
 540
 541                 yaffs_GrossUnlock(dev);
 542         }
 543
 544 }
 545
 546 /* delete is called when the link count is zero and the inode
 547  * is put (ie. nobody wants to know about it anymore, time to
 548  * delete the file).
 549  * NB Must call clear_inode()
 550  */
 551 static void yaffs_delete_inode(struct inode *inode)
 552 {
 553         yaffs_Object *obj = yaffs_InodeToObject(inode);
 554         yaffs_Device *dev;
 555
 556         T(YAFFS_TRACE_OS,
 557                 ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 558                 atomic_read(&inode->i_count),
 559                 obj ? "object exists" : "null object"));
 560
 561         if (obj) {
 562                 dev = obj->myDev;
 563                 yaffs_GrossLock(dev);
 564                 yaffs_DeleteObject(obj);
 565                 yaffs_GrossUnlock(dev);
 566         }
 567 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 568         truncate_inode_pages(&inode->i_data, 0);
 569 #endif
 570         clear_inode(inode);
 571 }
 572
 573 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 574 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 575 #else
 576 static int yaffs_file_flush(struct file *file)
 577 #endif
 578 {
 579         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 580
 581         yaffs_Device *dev = obj->myDev;
 582
 583         T(YAFFS_TRACE_OS,
 584                 ("yaffs_file_flush object %d (%s)\n", obj->objectId,
 585                 obj->dirty ? "dirty" : "clean"));
 586
 587         yaffs_GrossLock(dev);
 588
 589         yaffs_FlushFile(obj, 1);
 590
 591         yaffs_GrossUnlock(dev);
 592
 593         return 0;
 594 }
 595
 596 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 597 {
 598         /* Lifted from jffs2 */
 599
 600         yaffs_Object *obj;
 601         unsigned char *pg_buf;
 602         int ret;
 603
 604         yaffs_Device *dev;
 605
 606         T(YAFFS_TRACE_OS, ("yaffs_readpage at %08x, size %08x\n",
 607                         (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 608                         (unsigned)PAGE_CACHE_SIZE));
 609
 610         obj = yaffs_DentryToObject(f->f_dentry);
 611
 612         dev = obj->myDev;
 613
 614 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 615         BUG_ON(!PageLocked(pg));
 616 #else
 617         if (!PageLocked(pg))
 618                 PAGE_BUG(pg);
 619 #endif
 620
 621         pg_buf = kmap(pg);
 622         /* FIXME: Can kmap fail? */
 623
 624         yaffs_GrossLock(dev);
 625
 626         ret =
 627                 yaffs_ReadDataFromFile(obj, pg_buf,
 628                                 pg->index << PAGE_CACHE_SHIFT,
 629                                 PAGE_CACHE_SIZE);
 630
 631         yaffs_GrossUnlock(dev);
 632
 633         if (ret >= 0)
 634                 ret = 0;
 635
 636         if (ret) {
 637                 ClearPageUptodate(pg);
 638                 SetPageError(pg);
 639         } else {
 640                 SetPageUptodate(pg);
 641                 ClearPageError(pg);
 642         }
 643
 644         flush_dcache_page(pg);
 645         kunmap(pg);
 646
 647         T(YAFFS_TRACE_OS, ("yaffs_readpage done\n"));
 648         return ret;
 649 }
 650
 651 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 652 {
 653         int ret = yaffs_readpage_nolock(f, pg);
 654         UnlockPage(pg);
 655         return ret;
 656 }
 657
 658 static int yaffs_readpage(struct file *f, struct page *pg)
 659 {
 660         return yaffs_readpage_unlock(f, pg);
 661 }
 662
 663 /* writepage inspired by/stolen from smbfs */
 664
 665 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 666 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 667 #else
 668 static int yaffs_writepage(struct page *page)
 669 #endif
 670 {
 671         struct address_space *mapping = page->mapping;
 672         loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
 673         struct inode *inode;
 674         unsigned long end_index;
 675         char *buffer;
 676         yaffs_Object *obj;
 677         int nWritten = 0;
 678         unsigned nBytes;
 679
 680         if (!mapping)
 681                 BUG();
 682         inode = mapping->host;
 683         if (!inode)
 684                 BUG();
 685
 686         if (offset > inode->i_size) {
 687                 T(YAFFS_TRACE_OS,
 688                         ("yaffs_writepage at %08x, inode size = %08x!!!\n",
 689                         (unsigned)(page->index << PAGE_CACHE_SHIFT),
 690                         (unsigned)inode->i_size));
 691                 T(YAFFS_TRACE_OS,
 692                         ("                -> don't care!!\n"));
 693                 unlock_page(page);
 694                 return 0;
 695         }
 696
 697         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 698
 699         /* easy case */
 700         if (page->index < end_index)
 701                 nBytes = PAGE_CACHE_SIZE;
 702         else
 703                 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
 704
 705         get_page(page);
 706
 707         buffer = kmap(page);
 708
 709         obj = yaffs_InodeToObject(inode);
 710         yaffs_GrossLock(obj->myDev);
 711
 712         T(YAFFS_TRACE_OS,
 713                 ("yaffs_writepage at %08x, size %08x\n",
 714                 (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 715         T(YAFFS_TRACE_OS,
 716                 ("writepag0: obj = %05x, ino = %05x\n",
 717                 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 718
 719         nWritten = yaffs_WriteDataToFile(obj, buffer,
 720                         page->index << PAGE_CACHE_SHIFT, nBytes, 0);
 721
 722         T(YAFFS_TRACE_OS,
 723                 ("writepag1: obj = %05x, ino = %05x\n",
 724                 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 725
 726         yaffs_GrossUnlock(obj->myDev);
 727
 728         kunmap(page);
 729         SetPageUptodate(page);
 730         UnlockPage(page);
 731         put_page(page);
 732
 733         return (nWritten == nBytes) ? 0 : -ENOSPC;
 734 }
 735
 736
 737 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 738 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 739                                 loff_t pos, unsigned len, unsigned flags,
 740                                 struct page **pagep, void **fsdata)
 741 {
 742         struct page *pg = NULL;
 743         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
 744         uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
 745         uint32_t to = offset + len;
 746
 747         int ret = 0;
 748         int space_held = 0;
 749
 750         T(YAFFS_TRACE_OS, ("start yaffs_write_begin\n"));
 751         /* Get a page */
 752 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28)
 753         pg = grab_cache_page_write_begin(mapping, index, flags);
 754 #else
 755         pg = __grab_cache_page(mapping, index);
 756 #endif
 757
 758         *pagep = pg;
 759         if (!pg) {
 760                 ret =  -ENOMEM;
 761                 goto out;
 762         }
 763         /* Get fs space */
 764         space_held = yaffs_hold_space(filp);
 765
 766         if (!space_held) {
 767                 ret = -ENOSPC;
 768                 goto out;
 769         }
 770
 771         /* Update page if required */
 772
 773         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 774                 ret = yaffs_readpage_nolock(filp, pg);
 775
 776         if (ret)
 777                 goto out;
 778
 779         /* Happy path return */
 780         T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
 781
 782         return 0;
 783
 784 out:
 785         T(YAFFS_TRACE_OS, ("end yaffs_write_begin fail returning %d\n", ret));
 786         if (space_held)
 787                 yaffs_release_space(filp);
 788         if (pg) {
 789                 unlock_page(pg);
 790                 page_cache_release(pg);
 791         }
 792         return ret;
 793 }
 794
 795 #else
 796
 797 static int yaffs_prepare_write(struct file *f, struct page *pg,
 798                                 unsigned offset, unsigned to)
 799 {
 800         T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n"));
 801
 802         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 803                 return yaffs_readpage_nolock(f, pg);
 804         return 0;
 805 }
 806 #endif
 807
 808 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 809 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 810                                 loff_t pos, unsigned len, unsigned copied,
 811                                 struct page *pg, void *fsdadata)
 812 {
 813         int ret = 0;
 814         void *addr, *kva;
 815         uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
 816
 817         kva = kmap(pg);
 818         addr = kva + offset_into_page;
 819
 820         T(YAFFS_TRACE_OS,
 821                 ("yaffs_write_end addr %x pos %x nBytes %d\n",
 822                 (unsigned) addr,
 823                 (int)pos, copied));
 824
 825         ret = yaffs_file_write(filp, addr, copied, &pos);
 826
 827         if (ret != copied) {
 828                 T(YAFFS_TRACE_OS,
 829                         ("yaffs_write_end not same size ret %d  copied %d\n",
 830                         ret, copied));
 831                 SetPageError(pg);
 832                 ClearPageUptodate(pg);
 833         } else {
 834                 SetPageUptodate(pg);
 835         }
 836
 837         kunmap(pg);
 838
 839         yaffs_release_space(filp);
 840         unlock_page(pg);
 841         page_cache_release(pg);
 842         return ret;
 843 }
 844 #else
 845
 846 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 847                                 unsigned to)
 848 {
 849         void *addr, *kva;
 850
 851         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
 852         int nBytes = to - offset;
 853         int nWritten;
 854
 855         unsigned spos = pos;
 856         unsigned saddr;
 857
 858         kva = kmap(pg);
 859         addr = kva + offset;
 860
 861         saddr = (unsigned) addr;
 862
 863         T(YAFFS_TRACE_OS,
 864                 ("yaffs_commit_write addr %x pos %x nBytes %d\n",
 865                 saddr, spos, nBytes));
 866
 867         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
 868
 869         if (nWritten != nBytes) {
 870                 T(YAFFS_TRACE_OS,
 871                         ("yaffs_commit_write not same size nWritten %d  nBytes %d\n",
 872                         nWritten, nBytes));
 873                 SetPageError(pg);
 874                 ClearPageUptodate(pg);
 875         } else {
 876                 SetPageUptodate(pg);
 877         }
 878
 879         kunmap(pg);
 880
 881         T(YAFFS_TRACE_OS,
 882                 ("yaffs_commit_write returning %d\n",
 883                 nWritten == nBytes ? 0 : nWritten));
 884
 885         return nWritten == nBytes ? 0 : nWritten;
 886 }
 887 #endif
 888
 889
 890 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 891 {
 892         if (inode && obj) {
 893
 894
 895                 /* Check mode against the variant type and attempt to repair if broken. */
 896                 __u32 mode = obj->yst_mode;
 897                 switch (obj->variantType) {
 898                 case YAFFS_OBJECT_TYPE_FILE:
 899                         if (!S_ISREG(mode)) {
 900                                 obj->yst_mode &= ~S_IFMT;
 901                                 obj->yst_mode |= S_IFREG;
 902                         }
 903
 904                         break;
 905                 case YAFFS_OBJECT_TYPE_SYMLINK:
 906                         if (!S_ISLNK(mode)) {
 907                                 obj->yst_mode &= ~S_IFMT;
 908                                 obj->yst_mode |= S_IFLNK;
 909                         }
 910
 911                         break;
 912                 case YAFFS_OBJECT_TYPE_DIRECTORY:
 913                         if (!S_ISDIR(mode)) {
 914                                 obj->yst_mode &= ~S_IFMT;
 915                                 obj->yst_mode |= S_IFDIR;
 916                         }
 917
 918                         break;
 919                 case YAFFS_OBJECT_TYPE_UNKNOWN:
 920                 case YAFFS_OBJECT_TYPE_HARDLINK:
 921                 case YAFFS_OBJECT_TYPE_SPECIAL:
 922                 default:
 923                         /* TODO? */
 924                         break;
 925                 }
 926
 927                 inode->i_flags |= S_NOATIME;
 928
 929                 inode->i_ino = obj->objectId;
 930                 inode->i_mode = obj->yst_mode;
 931                 inode->i_uid = obj->yst_uid;
 932                 inode->i_gid = obj->yst_gid;
 933 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
 934                 inode->i_blksize = inode->i_sb->s_blocksize;
 935 #endif
 936 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 937
 938                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 939                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
 940                 inode->i_atime.tv_nsec = 0;
 941                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
 942                 inode->i_mtime.tv_nsec = 0;
 943                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
 944                 inode->i_ctime.tv_nsec = 0;
 945 #else
 946                 inode->i_rdev = obj->yst_rdev;
 947                 inode->i_atime = obj->yst_atime;
 948                 inode->i_mtime = obj->yst_mtime;
 949                 inode->i_ctime = obj->yst_ctime;
 950 #endif
 951                 inode->i_size = yaffs_GetObjectFileLength(obj);
 952                 inode->i_blocks = (inode->i_size + 511) >> 9;
 953
 954                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 955
 956                 T(YAFFS_TRACE_OS,
 957                         ("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 958                         inode->i_mode, inode->i_uid, inode->i_gid,
 959                         (int)inode->i_size, atomic_read(&inode->i_count)));
 960
 961                 switch (obj->yst_mode & S_IFMT) {
 962                 default:        /* fifo, device or socket */
 963 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 964                         init_special_inode(inode, obj->yst_mode,
 965                                         old_decode_dev(obj->yst_rdev));
 966 #else
 967                         init_special_inode(inode, obj->yst_mode,
 968                                         (dev_t) (obj->yst_rdev));
 969 #endif
 970                         break;
 971                 case S_IFREG:   /* file */
 972                         inode->i_op = &yaffs_file_inode_operations;
 973                         inode->i_fop = &yaffs_file_operations;
 974                         inode->i_mapping->a_ops =
 975                                 &yaffs_file_address_operations;
 976                         break;
 977                 case S_IFDIR:   /* directory */
 978                         inode->i_op = &yaffs_dir_inode_operations;
 979                         inode->i_fop = &yaffs_dir_operations;
 980                         break;
 981                 case S_IFLNK:   /* symlink */
 982                         inode->i_op = &yaffs_symlink_inode_operations;
 983                         break;
 984                 }
 985
 986                 yaffs_InodeToObjectLV(inode) = obj;
 987
 988                 obj->myInode = inode;
 989
 990         } else {
 991                 T(YAFFS_TRACE_OS,
 992                         ("yaffs_FileInode invalid parameters\n"));
 993         }
 994
 995 }
 996
 997 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 998                                 yaffs_Object *obj)
 999 {
1000         struct inode *inode;
1001
1002         if (!sb) {
1003                 T(YAFFS_TRACE_OS,
1004                         ("yaffs_get_inode for NULL super_block!!\n"));
1005                 return NULL;
1006
1007         }
1008
1009         if (!obj) {
1010                 T(YAFFS_TRACE_OS,
1011                         ("yaffs_get_inode for NULL object!!\n"));
1012                 return NULL;
1013
1014         }
1015
1016         T(YAFFS_TRACE_OS,
1017                 ("yaffs_get_inode for object %d\n", obj->objectId));
1018
1019         inode = Y_IGET(sb, obj->objectId);
1020         if (IS_ERR(inode))
1021                 return NULL;
1022
1023         /* NB Side effect: iget calls back to yaffs_read_inode(). */
1024         /* iget also increments the inode's i_count */
1025         /* NB You can't be holding grossLock or deadlock will happen! */
1026
1027         return inode;
1028 }
1029
1030 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1031                                 loff_t *pos)
1032 {
1033         yaffs_Object *obj;
1034         int nWritten, ipos;
1035         struct inode *inode;
1036         yaffs_Device *dev;
1037
1038         obj = yaffs_DentryToObject(f->f_dentry);
1039
1040         dev = obj->myDev;
1041
1042         yaffs_GrossLock(dev);
1043
1044         inode = f->f_dentry->d_inode;
1045
1046         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1047                 ipos = inode->i_size;
1048         else
1049                 ipos = *pos;
1050
1051         if (!obj)
1052                 T(YAFFS_TRACE_OS,
1053                         ("yaffs_file_write: hey obj is null!\n"));
1054         else
1055                 T(YAFFS_TRACE_OS,
1056                         ("yaffs_file_write about to write writing %zu bytes"
1057                         "to object %d at %d\n",
1058                         n, obj->objectId, ipos));
1059
1060         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
1061
1062         T(YAFFS_TRACE_OS,
1063                 ("yaffs_file_write writing %zu bytes, %d written at %d\n",
1064                 n, nWritten, ipos));
1065
1066         if (nWritten > 0) {
1067                 ipos += nWritten;
1068                 *pos = ipos;
1069                 if (ipos > inode->i_size) {
1070                         inode->i_size = ipos;
1071                         inode->i_blocks = (ipos + 511) >> 9;
1072
1073                         T(YAFFS_TRACE_OS,
1074                                 ("yaffs_file_write size updated to %d bytes, "
1075                                 "%d blocks\n",
1076                                 ipos, (int)(inode->i_blocks)));
1077                 }
1078
1079         }
1080         yaffs_GrossUnlock(dev);
1081         return nWritten == 0 ? -ENOSPC : nWritten;
1082 }
1083
1084 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1085 /* For now we just assume few parallel writes and check against a small number. */
1086 /* Todo: need to do this with a counter to handle parallel reads better */
1087
1088 static ssize_t yaffs_hold_space(struct file *f)
1089 {
1090         yaffs_Object *obj;
1091         yaffs_Device *dev;
1092
1093         int nFreeChunks;
1094
1095
1096         obj = yaffs_DentryToObject(f->f_dentry);
1097
1098         dev = obj->myDev;
1099
1100         yaffs_GrossLock(dev);
1101
1102         nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
1103
1104         yaffs_GrossUnlock(dev);
1105
1106         return (nFreeChunks > 20) ? 1 : 0;
1107 }
1108
1109 static void yaffs_release_space(struct file *f)
1110 {
1111         yaffs_Object *obj;
1112         yaffs_Device *dev;
1113
1114
1115         obj = yaffs_DentryToObject(f->f_dentry);
1116
1117         dev = obj->myDev;
1118
1119         yaffs_GrossLock(dev);
1120
1121
1122         yaffs_GrossUnlock(dev);
1123 }
1124
1125 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1126 {
1127         yaffs_Object *obj;
1128         yaffs_Device *dev;
1129         struct inode *inode = f->f_dentry->d_inode;
1130         unsigned long offset, curoffs;
1131         struct ylist_head *i;
1132         yaffs_Object *l;
1133
1134         char name[YAFFS_MAX_NAME_LENGTH + 1];
1135
1136         obj = yaffs_DentryToObject(f->f_dentry);
1137         dev = obj->myDev;
1138
1139         yaffs_GrossLock(dev);
1140
1141         offset = f->f_pos;
1142
1143         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
1144
1145         if (offset == 0) {
1146                 T(YAFFS_TRACE_OS,
1147                         ("yaffs_readdir: entry . ino %d \n",
1148                         (int)inode->i_ino));
1149                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
1150                         goto out;
1151                 offset++;
1152                 f->f_pos++;
1153         }
1154         if (offset == 1) {
1155                 T(YAFFS_TRACE_OS,
1156                         ("yaffs_readdir: entry .. ino %d \n",
1157                         (int)f->f_dentry->d_parent->d_inode->i_ino));
1158                 if (filldir(dirent, "..", 2, offset,
1159                         f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
1160                         goto out;
1161                 offset++;
1162                 f->f_pos++;
1163         }
1164
1165         curoffs = 1;
1166
1167         /* If the directory has changed since the open or last call to
1168            readdir, rewind to after the 2 canned entries. */
1169
1170         if (f->f_version != inode->i_version) {
1171                 offset = 2;
1172                 f->f_pos = offset;
1173                 f->f_version = inode->i_version;
1174         }
1175
1176         ylist_for_each(i, &obj->variant.directoryVariant.children) {
1177                 curoffs++;
1178                 if (curoffs >= offset) {
1179                         l = ylist_entry(i, yaffs_Object, siblings);
1180
1181                         yaffs_GetObjectName(l, name,
1182                                             YAFFS_MAX_NAME_LENGTH + 1);
1183                         T(YAFFS_TRACE_OS,
1184                           ("yaffs_readdir: %s inode %d\n", name,
1185                            yaffs_GetObjectInode(l)));
1186
1187                         if (filldir(dirent,
1188                                         name,
1189                                         strlen(name),
1190                                         offset,
1191                                         yaffs_GetObjectInode(l),
1192                                         yaffs_GetObjectType(l)) < 0)
1193                                 goto up_and_out;
1194
1195                         offset++;
1196                         f->f_pos++;
1197                 }
1198         }
1199
1200 up_and_out:
1201 out:
1202         yaffs_GrossUnlock(dev);
1203
1204         return 0;
1205 }
1206
1207 /*
1208  * File creation. Allocate an inode, and we're done..
1209  */
1210
1211 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1212 #define YCRED(x) x
1213 #else
1214 #define YCRED(x) (x->cred)
1215 #endif
1216
1217 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1218 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1219                         dev_t rdev)
1220 #else
1221 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1222                         int rdev)
1223 #endif
1224 {
1225         struct inode *inode;
1226
1227         yaffs_Object *obj = NULL;
1228         yaffs_Device *dev;
1229
1230         yaffs_Object *parent = yaffs_InodeToObject(dir);
1231
1232         int error = -ENOSPC;
1233         uid_t uid = YCRED(current)->fsuid;
1234         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1235
1236         if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1237                 mode |= S_ISGID;
1238
1239         if (parent) {
1240                 T(YAFFS_TRACE_OS,
1241                         ("yaffs_mknod: parent object %d type %d\n",
1242                         parent->objectId, parent->variantType));
1243         } else {
1244                 T(YAFFS_TRACE_OS,
1245                         ("yaffs_mknod: could not get parent object\n"));
1246                 return -EPERM;
1247         }
1248
1249         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1250                         "mode %x dev %x\n",
1251                         dentry->d_name.name, mode, rdev));
1252
1253         dev = parent->myDev;
1254
1255         yaffs_GrossLock(dev);
1256
1257         switch (mode & S_IFMT) {
1258         default:
1259                 /* Special (socket, fifo, device...) */
1260                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
1261 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1262                 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1263                                 gid, old_encode_dev(rdev));
1264 #else
1265                 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1266                                 gid, rdev);
1267 #endif
1268                 break;
1269         case S_IFREG:           /* file          */
1270                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
1271                 obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1272                                 gid);
1273                 break;
1274         case S_IFDIR:           /* directory */
1275                 T(YAFFS_TRACE_OS,
1276                         ("yaffs_mknod: making directory\n"));
1277                 obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1278                                         uid, gid);
1279                 break;
1280         case S_IFLNK:           /* symlink */
1281                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
1282                 obj = NULL;     /* Do we ever get here? */
1283                 break;
1284         }
1285
1286         /* Can not call yaffs_get_inode() with gross lock held */
1287         yaffs_GrossUnlock(dev);
1288
1289         if (obj) {
1290                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1291                 d_instantiate(dentry, inode);
1292                 T(YAFFS_TRACE_OS,
1293                         ("yaffs_mknod created object %d count = %d\n",
1294                         obj->objectId, atomic_read(&inode->i_count)));
1295                 error = 0;
1296         } else {
1297                 T(YAFFS_TRACE_OS,
1298                         ("yaffs_mknod failed making object\n"));
1299                 error = -ENOMEM;
1300         }
1301
1302         return error;
1303 }
1304
1305 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1306 {
1307         int retVal;
1308         T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
1309         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1310         return retVal;
1311 }
1312
1313 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1314 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1315                         struct nameidata *n)
1316 #else
1317 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1318 #endif
1319 {
1320         T(YAFFS_TRACE_OS, ("yaffs_create\n"));
1321         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1322 }
1323
1324 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1325 {
1326         int retVal;
1327
1328         yaffs_Device *dev;
1329
1330         T(YAFFS_TRACE_OS,
1331                 ("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1332                 dentry->d_name.name));
1333
1334         dev = yaffs_InodeToObject(dir)->myDev;
1335
1336         yaffs_GrossLock(dev);
1337
1338         retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1339
1340         if (retVal == YAFFS_OK) {
1341                 dentry->d_inode->i_nlink--;
1342                 dir->i_version++;
1343                 yaffs_GrossUnlock(dev);
1344                 mark_inode_dirty(dentry->d_inode);
1345                 return 0;
1346         }
1347         yaffs_GrossUnlock(dev);
1348         return -ENOTEMPTY;
1349 }
1350
1351 /*
1352  * Create a link...
1353  */
1354 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1355                         struct dentry *dentry)
1356 {
1357         struct inode *inode = old_dentry->d_inode;
1358         yaffs_Object *obj = NULL;
1359         yaffs_Object *link = NULL;
1360         yaffs_Device *dev;
1361
1362         T(YAFFS_TRACE_OS, ("yaffs_link\n"));
1363
1364         obj = yaffs_InodeToObject(inode);
1365         dev = obj->myDev;
1366
1367         yaffs_GrossLock(dev);
1368
1369         if (!S_ISDIR(inode->i_mode))            /* Don't link directories */
1370                 link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1371                         obj);
1372
1373         if (link) {
1374                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1375                 d_instantiate(dentry, old_dentry->d_inode);
1376                 atomic_inc(&old_dentry->d_inode->i_count);
1377                 T(YAFFS_TRACE_OS,
1378                         ("yaffs_link link count %d i_count %d\n",
1379                         old_dentry->d_inode->i_nlink,
1380                         atomic_read(&old_dentry->d_inode->i_count)));
1381         }
1382
1383         yaffs_GrossUnlock(dev);
1384
1385         if (link)
1386                 return 0;
1387
1388         return -EPERM;
1389 }
1390
1391 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1392                                 const char *symname)
1393 {
1394         yaffs_Object *obj;
1395         yaffs_Device *dev;
1396         uid_t uid = YCRED(current)->fsuid;
1397         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1398
1399         T(YAFFS_TRACE_OS, ("yaffs_symlink\n"));
1400
1401         dev = yaffs_InodeToObject(dir)->myDev;
1402         yaffs_GrossLock(dev);
1403         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1404                                 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1405         yaffs_GrossUnlock(dev);
1406
1407         if (obj) {
1408                 struct inode *inode;
1409
1410                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1411                 d_instantiate(dentry, inode);
1412                 T(YAFFS_TRACE_OS, ("symlink created OK\n"));
1413                 return 0;
1414         } else {
1415                 T(YAFFS_TRACE_OS, ("symlink not created\n"));
1416         }
1417
1418         return -ENOMEM;
1419 }
1420
1421 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1422                                 int datasync)
1423 {
1424
1425         yaffs_Object *obj;
1426         yaffs_Device *dev;
1427
1428         obj = yaffs_DentryToObject(dentry);
1429
1430         dev = obj->myDev;
1431
1432         T(YAFFS_TRACE_OS, ("yaffs_sync_object\n"));
1433         yaffs_GrossLock(dev);
1434         yaffs_FlushFile(obj, 1);
1435         yaffs_GrossUnlock(dev);
1436         return 0;
1437 }
1438
1439 /*
1440  * The VFS layer already does all the dentry stuff for rename.
1441  *
1442  * NB: POSIX says you can rename an object over an old object of the same name
1443  */
1444 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1445                         struct inode *new_dir, struct dentry *new_dentry)
1446 {
1447         yaffs_Device *dev;
1448         int retVal = YAFFS_FAIL;
1449         yaffs_Object *target;
1450
1451         T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
1452         dev = yaffs_InodeToObject(old_dir)->myDev;
1453
1454         yaffs_GrossLock(dev);
1455
1456         /* Check if the target is an existing directory that is not empty. */
1457         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1458                                 new_dentry->d_name.name);
1459
1460
1461
1462         if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1463                 !ylist_empty(&target->variant.directoryVariant.children)) {
1464
1465                 T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
1466
1467                 retVal = YAFFS_FAIL;
1468         } else {
1469                 /* Now does unlinking internally using shadowing mechanism */
1470                 T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
1471
1472                 retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1473                                 old_dentry->d_name.name,
1474                                 yaffs_InodeToObject(new_dir),
1475                                 new_dentry->d_name.name);
1476         }
1477         yaffs_GrossUnlock(dev);
1478
1479         if (retVal == YAFFS_OK) {
1480                 if (target) {
1481                         new_dentry->d_inode->i_nlink--;
1482                         mark_inode_dirty(new_dentry->d_inode);
1483                 }
1484
1485                 return 0;
1486         } else {
1487                 return -ENOTEMPTY;
1488         }
1489 }
1490
1491 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1492 {
1493         struct inode *inode = dentry->d_inode;
1494         int error;
1495         yaffs_Device *dev;
1496
1497         T(YAFFS_TRACE_OS,
1498                 ("yaffs_setattr of object %d\n",
1499                 yaffs_InodeToObject(inode)->objectId));
1500
1501         error = inode_change_ok(inode, attr);
1502         if (error == 0) {
1503                 dev = yaffs_InodeToObject(inode)->myDev;
1504                 yaffs_GrossLock(dev);
1505                 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1506                                 YAFFS_OK) {
1507                         error = 0;
1508                 } else {
1509                         error = -EPERM;
1510                 }
1511                 yaffs_GrossUnlock(dev);
1512                 if (!error)
1513                         error = inode_setattr(inode, attr);
1514         }
1515         return error;
1516 }
1517
1518 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1519 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1520 {
1521         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1522         struct super_block *sb = dentry->d_sb;
1523 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1524 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1525 {
1526         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1527 #else
1528 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1529 {
1530         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1531 #endif
1532
1533         T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
1534
1535         yaffs_GrossLock(dev);
1536
1537         buf->f_type = YAFFS_MAGIC;
1538         buf->f_bsize = sb->s_blocksize;
1539         buf->f_namelen = 255;
1540
1541         if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
1542                 /* Do this if chunk size is not a power of 2 */
1543
1544                 uint64_t bytesInDev;
1545                 uint64_t bytesFree;
1546
1547                 bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock + 1))) *
1548                         ((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk));
1549
1550                 do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
1551                 buf->f_blocks = bytesInDev;
1552
1553                 bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
1554                         ((uint64_t)(dev->nDataBytesPerChunk));
1555
1556                 do_div(bytesFree, sb->s_blocksize);
1557
1558                 buf->f_bfree = bytesFree;
1559
1560         } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1561
1562                 buf->f_blocks =
1563                         (dev->endBlock - dev->startBlock + 1) *
1564                         dev->nChunksPerBlock /
1565                         (sb->s_blocksize / dev->nDataBytesPerChunk);
1566                 buf->f_bfree =
1567                         yaffs_GetNumberOfFreeChunks(dev) /
1568                         (sb->s_blocksize / dev->nDataBytesPerChunk);
1569         } else {
1570                 buf->f_blocks =
1571                         (dev->endBlock - dev->startBlock + 1) *
1572                         dev->nChunksPerBlock *
1573                         (dev->nDataBytesPerChunk / sb->s_blocksize);
1574
1575                 buf->f_bfree =
1576                         yaffs_GetNumberOfFreeChunks(dev) *
1577                         (dev->nDataBytesPerChunk / sb->s_blocksize);
1578         }
1579
1580         buf->f_files = 0;
1581         buf->f_ffree = 0;
1582         buf->f_bavail = buf->f_bfree;
1583
1584         yaffs_GrossUnlock(dev);
1585         return 0;
1586 }
1587
1588
1589 static int yaffs_do_sync_fs(struct super_block *sb)
1590 {
1591
1592         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1593         T(YAFFS_TRACE_OS, ("yaffs_do_sync_fs\n"));
1594
1595         if (sb->s_dirt) {
1596                 yaffs_GrossLock(dev);
1597
1598                 if (dev) {
1599                         yaffs_FlushEntireDeviceCache(dev);
1600                         yaffs_CheckpointSave(dev);
1601                 }
1602
1603                 yaffs_GrossUnlock(dev);
1604
1605                 sb->s_dirt = 0;
1606         }
1607         return 0;
1608 }
1609
1610
1611 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1612 static void yaffs_write_super(struct super_block *sb)
1613 #else
1614 static int yaffs_write_super(struct super_block *sb)
1615 #endif
1616 {
1617
1618         T(YAFFS_TRACE_OS, ("yaffs_write_super\n"));
1619         if (yaffs_auto_checkpoint >= 2)
1620                 yaffs_do_sync_fs(sb);
1621 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
1622         return 0;
1623 #endif
1624 }
1625
1626
1627 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1628 static int yaffs_sync_fs(struct super_block *sb, int wait)
1629 #else
1630 static int yaffs_sync_fs(struct super_block *sb)
1631 #endif
1632 {
1633         T(YAFFS_TRACE_OS, ("yaffs_sync_fs\n"));
1634
1635         if (yaffs_auto_checkpoint >= 1)
1636                 yaffs_do_sync_fs(sb);
1637
1638         return 0;
1639 }
1640
1641 #ifdef YAFFS_USE_OWN_IGET
1642
1643 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
1644 {
1645         struct inode *inode;
1646         yaffs_Object *obj;
1647         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1648
1649         T(YAFFS_TRACE_OS,
1650                 ("yaffs_iget for %lu\n", ino));
1651
1652         inode = iget_locked(sb, ino);
1653         if (!inode)
1654                 return ERR_PTR(-ENOMEM);
1655         if (!(inode->i_state & I_NEW))
1656                 return inode;
1657
1658         /* NB This is called as a side effect of other functions, but
1659          * we had to release the lock to prevent deadlocks, so
1660          * need to lock again.
1661          */
1662
1663         yaffs_GrossLock(dev);
1664
1665         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1666
1667         yaffs_FillInodeFromObject(inode, obj);
1668
1669         yaffs_GrossUnlock(dev);
1670
1671         unlock_new_inode(inode);
1672         return inode;
1673 }
1674
1675 #else
1676
1677 static void yaffs_read_inode(struct inode *inode)
1678 {
1679         /* NB This is called as a side effect of other functions, but
1680          * we had to release the lock to prevent deadlocks, so
1681          * need to lock again.
1682          */
1683
1684         yaffs_Object *obj;
1685         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1686
1687         T(YAFFS_TRACE_OS,
1688                 ("yaffs_read_inode for %d\n", (int)inode->i_ino));
1689
1690         yaffs_GrossLock(dev);
1691
1692         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1693
1694         yaffs_FillInodeFromObject(inode, obj);
1695
1696         yaffs_GrossUnlock(dev);
1697 }
1698
1699 #endif
1700
1701 static YLIST_HEAD(yaffs_dev_list);
1702
1703 #if 0 /* not used */
1704 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1705 {
1706         yaffs_Device    *dev = yaffs_SuperToDevice(sb);
1707
1708         if (*flags & MS_RDONLY) {
1709                 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1710
1711                 T(YAFFS_TRACE_OS,
1712                         ("yaffs_remount_fs: %s: RO\n", dev->name));
1713
1714                 yaffs_GrossLock(dev);
1715
1716                 yaffs_FlushEntireDeviceCache(dev);
1717
1718                 yaffs_CheckpointSave(dev);
1719
1720                 if (mtd->sync)
1721                         mtd->sync(mtd);
1722
1723                 yaffs_GrossUnlock(dev);
1724         } else {
1725                 T(YAFFS_TRACE_OS,
1726                         ("yaffs_remount_fs: %s: RW\n", dev->name));
1727         }
1728
1729         return 0;
1730 }
1731 #endif
1732
1733 static void yaffs_put_super(struct super_block *sb)
1734 {
1735         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1736
1737         T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
1738
1739         yaffs_GrossLock(dev);
1740
1741         yaffs_FlushEntireDeviceCache(dev);
1742
1743         yaffs_CheckpointSave(dev);
1744
1745         if (dev->putSuperFunc)
1746                 dev->putSuperFunc(sb);
1747
1748         yaffs_Deinitialise(dev);
1749
1750         yaffs_GrossUnlock(dev);
1751
1752         /* we assume this is protected by lock_kernel() in mount/umount */
1753         ylist_del(&dev->devList);
1754
1755         if (dev->spareBuffer) {
1756                 YFREE(dev->spareBuffer);
1757                 dev->spareBuffer = NULL;
1758         }
1759
1760         kfree(dev);
1761 }
1762
1763
1764 static void yaffs_MTDPutSuper(struct super_block *sb)
1765 {
1766         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1767
1768         if (mtd->sync)
1769                 mtd->sync(mtd);
1770
1771         put_mtd_device(mtd);
1772 }
1773
1774
1775 static void yaffs_MarkSuperBlockDirty(void *vsb)
1776 {
1777         struct super_block *sb = (struct super_block *)vsb;
1778
1779         T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb));
1780         if (sb)
1781                 sb->s_dirt = 1;
1782 }
1783
1784 typedef struct {
1785         int inband_tags;
1786         int skip_checkpoint_read;
1787         int skip_checkpoint_write;
1788         int no_cache;
1789 } yaffs_options;
1790
1791 #define MAX_OPT_LEN 20
1792 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1793 {
1794         char cur_opt[MAX_OPT_LEN + 1];
1795         int p;
1796         int error = 0;
1797
1798         /* Parse through the options which is a comma seperated list */
1799
1800         while (options_str && *options_str && !error) {
1801                 memset(cur_opt, 0, MAX_OPT_LEN + 1);
1802                 p = 0;
1803
1804                 while (*options_str && *options_str != ',') {
1805                         if (p < MAX_OPT_LEN) {
1806                                 cur_opt[p] = *options_str;
1807                                 p++;
1808                         }
1809                         options_str++;
1810                 }
1811
1812                 if (!strcmp(cur_opt, "inband-tags"))
1813                         options->inband_tags = 1;
1814                 else if (!strcmp(cur_opt, "no-cache"))
1815                         options->no_cache = 1;
1816                 else if (!strcmp(cur_opt, "no-checkpoint-read"))
1817                         options->skip_checkpoint_read = 1;
1818                 else if (!strcmp(cur_opt, "no-checkpoint-write"))
1819                         options->skip_checkpoint_write = 1;
1820                 else if (!strcmp(cur_opt, "no-checkpoint")) {
1821                         options->skip_checkpoint_read = 1;
1822                         options->skip_checkpoint_write = 1;
1823                 } else {
1824                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
1825                                         cur_opt);
1826                         error = 1;
1827                 }
1828         }
1829
1830         return error;
1831 }
1832
1833 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1834                                                 struct super_block *sb,
1835                                                 void *data, int silent)
1836 {
1837         int nBlocks;
1838         struct inode *inode = NULL;
1839         struct dentry *root;
1840         yaffs_Device *dev = 0;
1841         char devname_buf[BDEVNAME_SIZE + 1];
1842         struct mtd_info *mtd;
1843         int err;
1844         char *data_str = (char *)data;
1845
1846         yaffs_options options;
1847
1848         sb->s_magic = YAFFS_MAGIC;
1849         sb->s_op = &yaffs_super_ops;
1850         sb->s_flags |= MS_NOATIME;
1851
1852         if (!sb)
1853                 printk(KERN_INFO "yaffs: sb is NULL\n");
1854         else if (!sb->s_dev)
1855                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1856         else if (!yaffs_devname(sb, devname_buf))
1857                 printk(KERN_INFO "yaffs: devname is NULL\n");
1858         else
1859                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1860                        sb->s_dev,
1861                        yaffs_devname(sb, devname_buf));
1862
1863         if (!data_str)
1864                 data_str = "";
1865
1866         printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
1867
1868         memset(&options, 0, sizeof(options));
1869
1870         if (yaffs_parse_options(&options, data_str)) {
1871                 /* Option parsing failed */
1872                 return NULL;
1873         }
1874
1875
1876         sb->s_blocksize = PAGE_CACHE_SIZE;
1877         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1878         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1879         T(YAFFS_TRACE_OS,
1880           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1881
1882 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1883         T(YAFFS_TRACE_OS,
1884           ("yaffs: Write verification disabled. All guarantees "
1885            "null and void\n"));
1886 #endif
1887
1888         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1889                                "\"%s\"\n",
1890                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
1891                                yaffs_devname(sb, devname_buf)));
1892
1893         /* Check it's an mtd device..... */
1894         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1895                 return NULL;    /* This isn't an mtd device */
1896
1897         /* Get the device */
1898         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1899         if (!mtd) {
1900                 T(YAFFS_TRACE_ALWAYS,
1901                   ("yaffs: MTD device #%u doesn't appear to exist\n",
1902                    MINOR(sb->s_dev)));
1903                 return NULL;
1904         }
1905         /* Check it's NAND */
1906         if (mtd->type != MTD_NANDFLASH) {
1907                 T(YAFFS_TRACE_ALWAYS,
1908                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1909                 return NULL;
1910         }
1911
1912         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1913         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1914         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1915         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1916         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1917         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1918         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1919         T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1920         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1921         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1922 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1923         T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
1924 #else
1925         T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
1926 #endif
1927
1928 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1929
1930         if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
1931                 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
1932                 yaffsVersion = 2;
1933         }
1934
1935         /* Added NCB 26/5/2006 for completeness */
1936         if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
1937                 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
1938                 yaffsVersion = 1;
1939         }
1940
1941 #endif
1942
1943         if (yaffsVersion == 2) {
1944                 /* Check for version 2 style functions */
1945                 if (!mtd->erase ||
1946                     !mtd->block_isbad ||
1947                     !mtd->block_markbad ||
1948                     !mtd->read ||
1949                     !mtd->write ||
1950 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1951                     !mtd->read_oob || !mtd->write_oob) {
1952 #else
1953                     !mtd->write_ecc ||
1954                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1955 #endif
1956                         T(YAFFS_TRACE_ALWAYS,
1957                           ("yaffs: MTD device does not support required "
1958                            "functions\n"));;
1959                         return NULL;
1960                 }
1961
1962                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1963                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
1964                     !options.inband_tags) {
1965                         T(YAFFS_TRACE_ALWAYS,
1966                           ("yaffs: MTD device does not have the "
1967                            "right page sizes\n"));
1968                         return NULL;
1969                 }
1970         } else {
1971                 /* Check for V1 style functions */
1972                 if (!mtd->erase ||
1973                     !mtd->read ||
1974                     !mtd->write ||
1975 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1976                     !mtd->read_oob || !mtd->write_oob) {
1977 #else
1978                     !mtd->write_ecc ||
1979                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1980 #endif
1981                         T(YAFFS_TRACE_ALWAYS,
1982                           ("yaffs: MTD device does not support required "
1983                            "functions\n"));;
1984                         return NULL;
1985                 }
1986
1987                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
1988                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1989                         T(YAFFS_TRACE_ALWAYS,
1990                           ("yaffs: MTD device does not support have the "
1991                            "right page sizes\n"));
1992                         return NULL;
1993                 }
1994         }
1995
1996         /* OK, so if we got here, we have an MTD that's NAND and looks
1997          * like it has the right capabilities
1998          * Set the yaffs_Device up for mtd
1999          */
2000
2001 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2002         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2003 #else
2004         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2005 #endif
2006         if (!dev) {
2007                 /* Deep shit could not allocate device structure */
2008                 T(YAFFS_TRACE_ALWAYS,
2009                   ("yaffs_read_super: Failed trying to allocate "
2010                    "yaffs_Device. \n"));
2011                 return NULL;
2012         }
2013
2014         memset(dev, 0, sizeof(yaffs_Device));
2015         dev->genericDevice = mtd;
2016         dev->name = mtd->name;
2017
2018         /* Set up the memory size parameters.... */
2019
2020         nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2021
2022         dev->startBlock = 0;
2023         dev->endBlock = nBlocks - 1;
2024         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
2025         dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
2026         dev->nReservedBlocks = 5;
2027         dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
2028         dev->inbandTags = options.inband_tags;
2029
2030         /* ... and the functions. */
2031         if (yaffsVersion == 2) {
2032                 dev->writeChunkWithTagsToNAND =
2033                     nandmtd2_WriteChunkWithTagsToNAND;
2034                 dev->readChunkWithTagsFromNAND =
2035                     nandmtd2_ReadChunkWithTagsFromNAND;
2036                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
2037                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
2038                 dev->spareBuffer = YMALLOC(mtd->oobsize);
2039                 dev->isYaffs2 = 1;
2040 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2041                 dev->totalBytesPerChunk = mtd->writesize;
2042                 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
2043 #else
2044                 dev->totalBytesPerChunk = mtd->oobblock;
2045                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
2046 #endif
2047                 nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2048
2049                 dev->startBlock = 0;
2050                 dev->endBlock = nBlocks - 1;
2051         } else {
2052 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2053                 /* use the MTD interface in yaffs_mtdif1.c */
2054                 dev->writeChunkWithTagsToNAND =
2055                         nandmtd1_WriteChunkWithTagsToNAND;
2056                 dev->readChunkWithTagsFromNAND =
2057                         nandmtd1_ReadChunkWithTagsFromNAND;
2058                 dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
2059                 dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
2060 #else
2061                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
2062                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
2063 #endif
2064                 dev->isYaffs2 = 0;
2065         }
2066         /* ... and common functions */
2067         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
2068         dev->initialiseNAND = nandmtd_InitialiseNAND;
2069
2070         dev->putSuperFunc = yaffs_MTDPutSuper;
2071
2072         dev->superBlock = (void *)sb;
2073         dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
2074
2075
2076 #ifndef CONFIG_YAFFS_DOES_ECC
2077         dev->useNANDECC = 1;
2078 #endif
2079
2080 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2081         dev->wideTnodesDisabled = 1;
2082 #endif
2083
2084         dev->skipCheckpointRead = options.skip_checkpoint_read;
2085         dev->skipCheckpointWrite = options.skip_checkpoint_write;
2086
2087         /* we assume this is protected by lock_kernel() in mount/umount */
2088         ylist_add_tail(&dev->devList, &yaffs_dev_list);
2089
2090         init_MUTEX(&dev->grossLock);
2091
2092         yaffs_GrossLock(dev);
2093
2094         err = yaffs_GutsInitialise(dev);
2095
2096         T(YAFFS_TRACE_OS,
2097           ("yaffs_read_super: guts initialised %s\n",
2098            (err == YAFFS_OK) ? "OK" : "FAILED"));
2099
2100         /* Release lock before yaffs_get_inode() */
2101         yaffs_GrossUnlock(dev);
2102
2103         /* Create root inode */
2104         if (err == YAFFS_OK)
2105                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
2106                                         yaffs_Root(dev));
2107
2108         if (!inode)
2109                 return NULL;
2110
2111         inode->i_op = &yaffs_dir_inode_operations;
2112         inode->i_fop = &yaffs_dir_operations;
2113
2114         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
2115
2116         root = d_alloc_root(inode);
2117
2118         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
2119
2120         if (!root) {
2121                 iput(inode);
2122                 return NULL;
2123         }
2124         sb->s_root = root;
2125         sb->s_dirt = !dev->isCheckpointed;
2126         T(YAFFS_TRACE_ALWAYS,
2127           ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
2128
2129         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
2130         return sb;
2131 }
2132
2133
2134 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2135 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2136                                          int silent)
2137 {
2138         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2139 }
2140
2141 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2142 static int yaffs_read_super(struct file_system_type *fs,
2143                             int flags, const char *dev_name,
2144                             void *data, struct vfsmount *mnt)
2145 {
2146
2147         return get_sb_bdev(fs, flags, dev_name, data,
2148                            yaffs_internal_read_super_mtd, mnt);
2149 }
2150 #else
2151 static struct super_block *yaffs_read_super(struct file_system_type *fs,
2152                                             int flags, const char *dev_name,
2153                                             void *data)
2154 {
2155
2156         return get_sb_bdev(fs, flags, dev_name, data,
2157                            yaffs_internal_read_super_mtd);
2158 }
2159 #endif
2160
2161 static struct file_system_type yaffs_fs_type = {
2162         .owner = THIS_MODULE,
2163         .name = "yaffs",
2164         .get_sb = yaffs_read_super,
2165         .kill_sb = kill_block_super,
2166         .fs_flags = FS_REQUIRES_DEV,
2167 };
2168 #else
2169 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
2170                                             int silent)
2171 {
2172         return yaffs_internal_read_super(1, sb, data, silent);
2173 }
2174
2175 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
2176                       FS_REQUIRES_DEV);
2177 #endif
2178
2179
2180 #ifdef CONFIG_YAFFS_YAFFS2
2181
2182 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2183 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2184                                           int silent)
2185 {
2186         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2187 }
2188
2189 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2190 static int yaffs2_read_super(struct file_system_type *fs,
2191                         int flags, const char *dev_name, void *data,
2192                         struct vfsmount *mnt)
2193 {
2194         return get_sb_bdev(fs, flags, dev_name, data,
2195                         yaffs2_internal_read_super_mtd, mnt);
2196 }
2197 #else
2198 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
2199                                              int flags, const char *dev_name,
2200                                              void *data)
2201 {
2202
2203         return get_sb_bdev(fs, flags, dev_name, data,
2204                            yaffs2_internal_read_super_mtd);
2205 }
2206 #endif
2207
2208 static struct file_system_type yaffs2_fs_type = {
2209         .owner = THIS_MODULE,
2210         .name = "yaffs2",
2211         .get_sb = yaffs2_read_super,
2212         .kill_sb = kill_block_super,
2213         .fs_flags = FS_REQUIRES_DEV,
2214 };
2215 #else
2216 static struct super_block *yaffs2_read_super(struct super_block *sb,
2217                                              void *data, int silent)
2218 {
2219         return yaffs_internal_read_super(2, sb, data, silent);
2220 }
2221
2222 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
2223                       FS_REQUIRES_DEV);
2224 #endif
2225
2226 #endif                          /* CONFIG_YAFFS_YAFFS2 */
2227
2228 static struct proc_dir_entry *my_proc_entry;
2229
2230 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
2231 {
2232         buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
2233         buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
2234         buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
2235         buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
2236         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
2237         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
2238         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
2239         buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
2240         buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2241         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2242         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2243         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2244         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2245         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2246         buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
2247         buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
2248         buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
2249         buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
2250         buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
2251         buf += sprintf(buf, "passiveGCs......... %d\n",
2252                     dev->passiveGarbageCollections);
2253         buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
2254         buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
2255         buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
2256         buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
2257         buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
2258         buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
2259         buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
2260         buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
2261         buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
2262         buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
2263         buf +=
2264             sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
2265         buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
2266         buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
2267         buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);
2268
2269         return buf;
2270 }
2271
2272 static int yaffs_proc_read(char *page,
2273                            char **start,
2274                            off_t offset, int count, int *eof, void *data)
2275 {
2276         struct ylist_head *item;
2277         char *buf = page;
2278         int step = offset;
2279         int n = 0;
2280
2281         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2282          * We use 'offset' (*ppos) to indicate where we are in devList.
2283          * This also assumes the user has posted a read buffer large
2284          * enough to hold the complete output; but that's life in /proc.
2285          */
2286
2287         *(int *)start = 1;
2288
2289         /* Print header first */
2290         if (step == 0) {
2291                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2292                                "\n%s\n%s\n", yaffs_fs_c_version,
2293                                yaffs_guts_c_version);
2294         }
2295
2296         /* hold lock_kernel while traversing yaffs_dev_list */
2297         lock_kernel();
2298
2299         /* Locate and print the Nth entry.  Order N-squared but N is small. */
2300         ylist_for_each(item, &yaffs_dev_list) {
2301                 yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
2302                 if (n < step) {
2303                         n++;
2304                         continue;
2305                 }
2306                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2307                 buf = yaffs_dump_dev(buf, dev);
2308                 break;
2309         }
2310         unlock_kernel();
2311
2312         return buf - page < count ? buf - page : count;
2313 }
2314
2315 /**
2316  * Set the verbosity of the warnings and error messages.
2317  *
2318  * Note that the names can only be a..z or _ with the current code.
2319  */
2320
2321 static struct {
2322         char *mask_name;
2323         unsigned mask_bitfield;
2324 } mask_flags[] = {
2325         {"allocate", YAFFS_TRACE_ALLOCATE},
2326         {"always", YAFFS_TRACE_ALWAYS},
2327         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2328         {"buffers", YAFFS_TRACE_BUFFERS},
2329         {"bug", YAFFS_TRACE_BUG},
2330         {"checkpt", YAFFS_TRACE_CHECKPOINT},
2331         {"deletion", YAFFS_TRACE_DELETION},
2332         {"erase", YAFFS_TRACE_ERASE},
2333         {"error", YAFFS_TRACE_ERROR},
2334         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2335         {"gc", YAFFS_TRACE_GC},
2336         {"mtd", YAFFS_TRACE_MTD},
2337         {"nandaccess", YAFFS_TRACE_NANDACCESS},
2338         {"os", YAFFS_TRACE_OS},
2339         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2340         {"scan", YAFFS_TRACE_SCAN},
2341         {"tracing", YAFFS_TRACE_TRACING},
2342
2343         {"verify", YAFFS_TRACE_VERIFY},
2344         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2345         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2346         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2347
2348         {"write", YAFFS_TRACE_WRITE},
2349         {"all", 0xffffffff},
2350         {"none", 0},
2351         {NULL, 0},
2352 };
2353
2354 #define MAX_MASK_NAME_LENGTH 40
2355 static int yaffs_proc_write(struct file *file, const char *buf,
2356                                          unsigned long count, void *data)
2357 {
2358         unsigned rg = 0, mask_bitfield;
2359         char *end;
2360         char *mask_name;
2361         const char *x;
2362         char substring[MAX_MASK_NAME_LENGTH + 1];
2363         int i;
2364         int done = 0;
2365         int add, len = 0;
2366         int pos = 0;
2367
2368         rg = yaffs_traceMask;
2369
2370         while (!done && (pos < count)) {
2371                 done = 1;
2372                 while ((pos < count) && isspace(buf[pos]))
2373                         pos++;
2374
2375                 switch (buf[pos]) {
2376                 case '+':
2377                 case '-':
2378                 case '=':
2379                         add = buf[pos];
2380                         pos++;
2381                         break;
2382
2383                 default:
2384                         add = ' ';
2385                         break;
2386                 }
2387                 mask_name = NULL;
2388
2389                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2390
2391                 if (end > buf + pos) {
2392                         mask_name = "numeral";
2393                         len = end - (buf + pos);
2394                         pos += len;
2395                         done = 0;
2396                 } else {
2397                         for (x = buf + pos, i = 0;
2398                             (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
2399                             i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2400                                 substring[i] = *x;
2401                         substring[i] = '\0';
2402
2403                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2404                                 if (strcmp(substring, mask_flags[i].mask_name) == 0) {
2405                                         mask_name = mask_flags[i].mask_name;
2406                                         mask_bitfield = mask_flags[i].mask_bitfield;
2407                                         done = 0;
2408                                         break;
2409                                 }
2410                         }
2411                 }
2412
2413                 if (mask_name != NULL) {
2414                         done = 0;
2415                         switch (add) {
2416                         case '-':
2417                                 rg &= ~mask_bitfield;
2418                                 break;
2419                         case '+':
2420                                 rg |= mask_bitfield;
2421                                 break;
2422                         case '=':
2423                                 rg = mask_bitfield;
2424                                 break;
2425                         default:
2426                                 rg |= mask_bitfield;
2427                                 break;
2428                         }
2429                 }
2430         }
2431
2432         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2433
2434         printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
2435
2436         if (rg & YAFFS_TRACE_ALWAYS) {
2437                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2438                         char flag;
2439                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2440                         printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
2441                 }
2442         }
2443
2444         return count;
2445 }
2446
2447 /* Stuff to handle installation of file systems */
2448 struct file_system_to_install {
2449         struct file_system_type *fst;
2450         int installed;
2451 };
2452
2453 static struct file_system_to_install fs_to_install[] = {
2454         {&yaffs_fs_type, 0},
2455         {&yaffs2_fs_type, 0},
2456         {NULL, 0}
2457 };
2458
2459 static int __init init_yaffs_fs(void)
2460 {
2461         int error = 0;
2462         struct file_system_to_install *fsinst;
2463
2464         T(YAFFS_TRACE_ALWAYS,
2465           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2466
2467         /* Install the proc_fs entry */
2468         my_proc_entry = create_proc_entry("yaffs",
2469                                                S_IRUGO | S_IFREG,
2470                                                YPROC_ROOT);
2471
2472         if (my_proc_entry) {
2473                 my_proc_entry->write_proc = yaffs_proc_write;
2474                 my_proc_entry->read_proc = yaffs_proc_read;
2475                 my_proc_entry->data = NULL;
2476         } else
2477                 return -ENOMEM;
2478
2479         /* Now add the file system entries */
2480
2481         fsinst = fs_to_install;
2482
2483         while (fsinst->fst && !error) {
2484                 error = register_filesystem(fsinst->fst);
2485                 if (!error)
2486                         fsinst->installed = 1;
2487                 fsinst++;
2488         }
2489
2490         /* Any errors? uninstall  */
2491         if (error) {
2492                 fsinst = fs_to_install;
2493
2494                 while (fsinst->fst) {
2495                         if (fsinst->installed) {
2496                                 unregister_filesystem(fsinst->fst);
2497                                 fsinst->installed = 0;
2498                         }
2499                         fsinst++;
2500                 }
2501         }
2502
2503         return error;
2504 }
2505
2506 static void __exit exit_yaffs_fs(void)
2507 {
2508
2509         struct file_system_to_install *fsinst;
2510
2511         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2512                                " removing. \n"));
2513
2514         remove_proc_entry("yaffs", YPROC_ROOT);
2515
2516         fsinst = fs_to_install;
2517
2518         while (fsinst->fst) {
2519                 if (fsinst->installed) {
2520                         unregister_filesystem(fsinst->fst);
2521                         fsinst->installed = 0;
2522                 }
2523                 fsinst++;
2524         }
2525 }
2526
2527 module_init(init_yaffs_fs)
2528 module_exit(exit_yaffs_fs)
2529
2530 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2531 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2532 MODULE_LICENSE("GPL");