yaffs_fs.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2009 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  * Acknowledgements:
   9  * Luc van OostenRyck for numerous patches.
  10  * Nick Bane for numerous patches.
  11  * Nick Bane for 2.5/2.6 integration.
  12  * Andras Toth for mknod rdev issue.
  13  * Michael Fischer for finding the problem with inode inconsistency.
  14  * Some code bodily lifted from JFFS
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 /*
  22  *
  23  * This is the file system front-end to YAFFS that hooks it up to
  24  * the VFS.
  25  *
  26  * Special notes:
  27  * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
  28  *         this superblock
  29  * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this
  30  *         superblock
  31  * >> inode->u.generic_ip points to the associated yaffs_Object.
  32  */
  33
  34 const char *yaffs_fs_c_version =
  35     "$Id: yaffs_fs.c,v 1.81 2009-05-26 01:22:44 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
 167 #define update_dir_time(dir) do {\
 168                         (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
 169                 } while(0)
 170
 171 static void yaffs_put_super(struct super_block *sb);
 172
 173 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 174                                 loff_t *pos);
 175 static ssize_t yaffs_hold_space(struct file *f);
 176 static void yaffs_release_space(struct file *f);
 177
 178 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 179 static int yaffs_file_flush(struct file *file, fl_owner_t id);
 180 #else
 181 static int yaffs_file_flush(struct file *file);
 182 #endif
 183
 184 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 185                                 int datasync);
 186
 187 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 188
 189 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 190 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 191                         struct nameidata *n);
 192 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 193                                         struct nameidata *n);
 194 #else
 195 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 196 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 197 #endif
 198 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 199                         struct dentry *dentry);
 200 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 201 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 202                         const char *symname);
 203 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 204
 205 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 206 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 207                         dev_t dev);
 208 #else
 209 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 210                         int dev);
 211 #endif
 212 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 213                         struct inode *new_dir, struct dentry *new_dentry);
 214 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 215
 216 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 217 static int yaffs_sync_fs(struct super_block *sb, int wait);
 218 static void yaffs_write_super(struct super_block *sb);
 219 #else
 220 static int yaffs_sync_fs(struct super_block *sb);
 221 static int yaffs_write_super(struct super_block *sb);
 222 #endif
 223
 224 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 225 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
 226 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 227 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 228 #else
 229 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 230 #endif
 231
 232 #ifdef YAFFS_HAS_PUT_INODE
 233 static void yaffs_put_inode(struct inode *inode);
 234 #endif
 235
 236 static void yaffs_delete_inode(struct inode *);
 237 static void yaffs_clear_inode(struct inode *);
 238
 239 static int yaffs_readpage(struct file *file, struct page *page);
 240 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 241 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 242 #else
 243 static int yaffs_writepage(struct page *page);
 244 #endif
 245
 246
 247 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
 248 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 249                                 loff_t pos, unsigned len, unsigned flags,
 250                                 struct page **pagep, void **fsdata);
 251 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 252                                 loff_t pos, unsigned len, unsigned copied,
 253                                 struct page *pg, void *fsdadata);
 254 #else
 255 static int yaffs_prepare_write(struct file *f, struct page *pg,
 256                                 unsigned offset, unsigned to);
 257 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 258                                 unsigned to);
 259
 260 #endif
 261
 262 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
 263                                 int buflen);
 264 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 265 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 266 #else
 267 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 268 #endif
 269
 270 static struct address_space_operations yaffs_file_address_operations = {
 271         .readpage = yaffs_readpage,
 272         .writepage = yaffs_writepage,
 273 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 274         .write_begin = yaffs_write_begin,
 275         .write_end = yaffs_write_end,
 276 #else
 277         .prepare_write = yaffs_prepare_write,
 278         .commit_write = yaffs_commit_write,
 279 #endif
 280 };
 281
 282 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
 283 static const struct file_operations yaffs_file_operations = {
 284         .read = do_sync_read,
 285         .write = do_sync_write,
 286         .aio_read = generic_file_aio_read,
 287         .aio_write = generic_file_aio_write,
 288         .mmap = generic_file_mmap,
 289         .flush = yaffs_file_flush,
 290         .fsync = yaffs_sync_object,
 291         .splice_read = generic_file_splice_read,
 292         .splice_write = generic_file_splice_write,
 293         .llseek = generic_file_llseek,
 294 };
 295
 296 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
 297
 298 static const struct file_operations yaffs_file_operations = {
 299         .read = do_sync_read,
 300         .write = do_sync_write,
 301         .aio_read = generic_file_aio_read,
 302         .aio_write = generic_file_aio_write,
 303         .mmap = generic_file_mmap,
 304         .flush = yaffs_file_flush,
 305         .fsync = yaffs_sync_object,
 306         .sendfile = generic_file_sendfile,
 307 };
 308
 309 #else
 310
 311 static const struct file_operations yaffs_file_operations = {
 312         .read = generic_file_read,
 313         .write = generic_file_write,
 314         .mmap = generic_file_mmap,
 315         .flush = yaffs_file_flush,
 316         .fsync = yaffs_sync_object,
 317 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 318         .sendfile = generic_file_sendfile,
 319 #endif
 320 };
 321 #endif
 322
 323 static const struct inode_operations yaffs_file_inode_operations = {
 324         .setattr = yaffs_setattr,
 325 };
 326
 327 static const struct inode_operations yaffs_symlink_inode_operations = {
 328         .readlink = yaffs_readlink,
 329         .follow_link = yaffs_follow_link,
 330         .setattr = yaffs_setattr,
 331 };
 332
 333 static const struct inode_operations yaffs_dir_inode_operations = {
 334         .create = yaffs_create,
 335         .lookup = yaffs_lookup,
 336         .link = yaffs_link,
 337         .unlink = yaffs_unlink,
 338         .symlink = yaffs_symlink,
 339         .mkdir = yaffs_mkdir,
 340         .rmdir = yaffs_unlink,
 341         .mknod = yaffs_mknod,
 342         .rename = yaffs_rename,
 343         .setattr = yaffs_setattr,
 344 };
 345
 346 static const struct file_operations yaffs_dir_operations = {
 347         .read = generic_read_dir,
 348         .readdir = yaffs_readdir,
 349         .fsync = yaffs_sync_object,
 350 };
 351
 352 static const struct super_operations yaffs_super_ops = {
 353         .statfs = yaffs_statfs,
 354
 355 #ifndef YAFFS_USE_OWN_IGET
 356         .read_inode = yaffs_read_inode,
 357 #endif
 358 #ifdef YAFFS_HAS_PUT_INODE
 359         .put_inode = yaffs_put_inode,
 360 #endif
 361         .put_super = yaffs_put_super,
 362         .delete_inode = yaffs_delete_inode,
 363         .clear_inode = yaffs_clear_inode,
 364         .sync_fs = yaffs_sync_fs,
 365         .write_super = yaffs_write_super,
 366 };
 367
 368 static void yaffs_GrossLock(yaffs_Device *dev)
 369 {
 370         T(YAFFS_TRACE_OS, ("yaffs locking %p\n", current));
 371         down(&dev->grossLock);
 372         T(YAFFS_TRACE_OS, ("yaffs locked %p\n", current));
 373 }
 374
 375 static void yaffs_GrossUnlock(yaffs_Device *dev)
 376 {
 377         T(YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current));
 378         up(&dev->grossLock);
 379 }
 380
 381 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
 382                         int buflen)
 383 {
 384         unsigned char *alias;
 385         int ret;
 386
 387         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 388
 389         yaffs_GrossLock(dev);
 390
 391         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 392
 393         yaffs_GrossUnlock(dev);
 394
 395         if (!alias)
 396                 return -ENOMEM;
 397
 398         ret = vfs_readlink(dentry, buffer, buflen, alias);
 399         kfree(alias);
 400         return ret;
 401 }
 402
 403 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 404 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 405 #else
 406 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 407 #endif
 408 {
 409         unsigned char *alias;
 410         int ret;
 411         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 412
 413         yaffs_GrossLock(dev);
 414
 415         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 416
 417         yaffs_GrossUnlock(dev);
 418
 419         if (!alias) {
 420                 ret = -ENOMEM;
 421                 goto out;
 422         }
 423
 424         ret = vfs_follow_link(nd, alias);
 425         kfree(alias);
 426 out:
 427 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 428         return ERR_PTR(ret);
 429 #else
 430         return ret;
 431 #endif
 432 }
 433
 434 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 435                                 yaffs_Object *obj);
 436
 437 /*
 438  * Lookup is used to find objects in the fs
 439  */
 440 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 441
 442 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 443                                 struct nameidata *n)
 444 #else
 445 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 446 #endif
 447 {
 448         yaffs_Object *obj;
 449         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 450
 451         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 452
 453         yaffs_GrossLock(dev);
 454
 455         T(YAFFS_TRACE_OS,
 456                 ("yaffs_lookup for %d:%s\n",
 457                 yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 458
 459         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
 460                                         dentry->d_name.name);
 461
 462         obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
 463
 464         /* Can't hold gross lock when calling yaffs_get_inode() */
 465         yaffs_GrossUnlock(dev);
 466
 467         if (obj) {
 468                 T(YAFFS_TRACE_OS,
 469                         ("yaffs_lookup found %d\n", obj->objectId));
 470
 471                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 472
 473                 if (inode) {
 474                         T(YAFFS_TRACE_OS,
 475                                 ("yaffs_loookup dentry \n"));
 476 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 477  * d_add even if NULL inode */
 478 #if 0
 479                         /*dget(dentry); // try to solve directory bug */
 480                         d_add(dentry, inode);
 481
 482                         /* return dentry; */
 483                         return NULL;
 484 #endif
 485                 }
 486
 487         } else {
 488                 T(YAFFS_TRACE_OS, ("yaffs_lookup not found\n"));
 489
 490         }
 491
 492 /* added NCB for 2.5/6 compatability - forces add even if inode is
 493  * NULL which creates dentry hash */
 494         d_add(dentry, inode);
 495
 496         return NULL;
 497 }
 498
 499
 500 #ifdef YAFFS_HAS_PUT_INODE
 501
 502 /* For now put inode is just for debugging
 503  * Put inode is called when the inode **structure** is put.
 504  */
 505 static void yaffs_put_inode(struct inode *inode)
 506 {
 507         T(YAFFS_TRACE_OS,
 508                 ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 509                 atomic_read(&inode->i_count)));
 510
 511 }
 512 #endif
 513
 514 /* clear is called to tell the fs to release any per-inode data it holds */
 515 static void yaffs_clear_inode(struct inode *inode)
 516 {
 517         yaffs_Object *obj;
 518         yaffs_Device *dev;
 519
 520         obj = yaffs_InodeToObject(inode);
 521
 522         T(YAFFS_TRACE_OS,
 523                 ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 524                 atomic_read(&inode->i_count),
 525                 obj ? "object exists" : "null object"));
 526
 527         if (obj) {
 528                 dev = obj->myDev;
 529                 yaffs_GrossLock(dev);
 530
 531                 /* Clear the association between the inode and
 532                  * the yaffs_Object.
 533                  */
 534                 obj->myInode = NULL;
 535                 yaffs_InodeToObjectLV(inode) = NULL;
 536
 537                 /* If the object freeing was deferred, then the real
 538                  * free happens now.
 539                  * This should fix the inode inconsistency problem.
 540                  */
 541
 542                 yaffs_HandleDeferedFree(obj);
 543
 544                 yaffs_GrossUnlock(dev);
 545         }
 546
 547 }
 548
 549 /* delete is called when the link count is zero and the inode
 550  * is put (ie. nobody wants to know about it anymore, time to
 551  * delete the file).
 552  * NB Must call clear_inode()
 553  */
 554 static void yaffs_delete_inode(struct inode *inode)
 555 {
 556         yaffs_Object *obj = yaffs_InodeToObject(inode);
 557         yaffs_Device *dev;
 558
 559         T(YAFFS_TRACE_OS,
 560                 ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 561                 atomic_read(&inode->i_count),
 562                 obj ? "object exists" : "null object"));
 563
 564         if (obj) {
 565                 dev = obj->myDev;
 566                 yaffs_GrossLock(dev);
 567                 yaffs_DeleteObject(obj);
 568                 yaffs_GrossUnlock(dev);
 569         }
 570 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 571         truncate_inode_pages(&inode->i_data, 0);
 572 #endif
 573         clear_inode(inode);
 574 }
 575
 576 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 577 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 578 #else
 579 static int yaffs_file_flush(struct file *file)
 580 #endif
 581 {
 582         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 583
 584         yaffs_Device *dev = obj->myDev;
 585
 586         T(YAFFS_TRACE_OS,
 587                 ("yaffs_file_flush object %d (%s)\n", obj->objectId,
 588                 obj->dirty ? "dirty" : "clean"));
 589
 590         yaffs_GrossLock(dev);
 591
 592         yaffs_FlushFile(obj, 1);
 593
 594         yaffs_GrossUnlock(dev);
 595
 596         return 0;
 597 }
 598
 599 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 600 {
 601         /* Lifted from jffs2 */
 602
 603         yaffs_Object *obj;
 604         unsigned char *pg_buf;
 605         int ret;
 606
 607         yaffs_Device *dev;
 608
 609         T(YAFFS_TRACE_OS, ("yaffs_readpage at %08x, size %08x\n",
 610                         (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 611                         (unsigned)PAGE_CACHE_SIZE));
 612
 613         obj = yaffs_DentryToObject(f->f_dentry);
 614
 615         dev = obj->myDev;
 616
 617 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 618         BUG_ON(!PageLocked(pg));
 619 #else
 620         if (!PageLocked(pg))
 621                 PAGE_BUG(pg);
 622 #endif
 623
 624         pg_buf = kmap(pg);
 625         /* FIXME: Can kmap fail? */
 626
 627         yaffs_GrossLock(dev);
 628
 629         ret = yaffs_ReadDataFromFile(obj, pg_buf,
 630                                 pg->index << PAGE_CACHE_SHIFT,
 631                                 PAGE_CACHE_SIZE);
 632
 633         yaffs_GrossUnlock(dev);
 634
 635         if (ret >= 0)
 636                 ret = 0;
 637
 638         if (ret) {
 639                 ClearPageUptodate(pg);
 640                 SetPageError(pg);
 641         } else {
 642                 SetPageUptodate(pg);
 643                 ClearPageError(pg);
 644         }
 645
 646         flush_dcache_page(pg);
 647         kunmap(pg);
 648
 649         T(YAFFS_TRACE_OS, ("yaffs_readpage done\n"));
 650         return ret;
 651 }
 652
 653 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 654 {
 655         int ret = yaffs_readpage_nolock(f, pg);
 656         UnlockPage(pg);
 657         return ret;
 658 }
 659
 660 static int yaffs_readpage(struct file *f, struct page *pg)
 661 {
 662         return yaffs_readpage_unlock(f, pg);
 663 }
 664
 665 /* writepage inspired by/stolen from smbfs */
 666
 667 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 668 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 669 #else
 670 static int yaffs_writepage(struct page *page)
 671 #endif
 672 {
 673         struct address_space *mapping = page->mapping;
 674         loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
 675         struct inode *inode;
 676         unsigned long end_index;
 677         char *buffer;
 678         yaffs_Object *obj;
 679         int nWritten = 0;
 680         unsigned nBytes;
 681
 682         if (!mapping)
 683                 BUG();
 684         inode = mapping->host;
 685         if (!inode)
 686                 BUG();
 687
 688         if (offset > inode->i_size) {
 689                 T(YAFFS_TRACE_OS,
 690                         ("yaffs_writepage at %08x, inode size = %08x!!!\n",
 691                         (unsigned)(page->index << PAGE_CACHE_SHIFT),
 692                         (unsigned)inode->i_size));
 693                 T(YAFFS_TRACE_OS,
 694                         ("                -> don't care!!\n"));
 695                 unlock_page(page);
 696                 return 0;
 697         }
 698
 699         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 700
 701         /* easy case */
 702         if (page->index < end_index)
 703                 nBytes = PAGE_CACHE_SIZE;
 704         else
 705                 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
 706
 707         get_page(page);
 708
 709         buffer = kmap(page);
 710
 711         obj = yaffs_InodeToObject(inode);
 712         yaffs_GrossLock(obj->myDev);
 713
 714         T(YAFFS_TRACE_OS,
 715                 ("yaffs_writepage at %08x, size %08x\n",
 716                 (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 717         T(YAFFS_TRACE_OS,
 718                 ("writepag0: obj = %05x, ino = %05x\n",
 719                 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 720
 721         nWritten = yaffs_WriteDataToFile(obj, buffer,
 722                         page->index << PAGE_CACHE_SHIFT, nBytes, 0);
 723
 724         T(YAFFS_TRACE_OS,
 725                 ("writepag1: obj = %05x, ino = %05x\n",
 726                 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 727
 728         yaffs_GrossUnlock(obj->myDev);
 729
 730         kunmap(page);
 731         SetPageUptodate(page);
 732         UnlockPage(page);
 733         put_page(page);
 734
 735         return (nWritten == nBytes) ? 0 : -ENOSPC;
 736 }
 737
 738
 739 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 740 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 741                                 loff_t pos, unsigned len, unsigned flags,
 742                                 struct page **pagep, void **fsdata)
 743 {
 744         struct page *pg = NULL;
 745         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
 746         uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
 747         uint32_t to = offset + len;
 748
 749         int ret = 0;
 750         int space_held = 0;
 751
 752         T(YAFFS_TRACE_OS, ("start yaffs_write_begin\n"));
 753         /* Get a page */
 754 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28)
 755         pg = grab_cache_page_write_begin(mapping, index, flags);
 756 #else
 757         pg = __grab_cache_page(mapping, index);
 758 #endif
 759
 760         *pagep = pg;
 761         if (!pg) {
 762                 ret =  -ENOMEM;
 763                 goto out;
 764         }
 765         /* Get fs space */
 766         space_held = yaffs_hold_space(filp);
 767
 768         if (!space_held) {
 769                 ret = -ENOSPC;
 770                 goto out;
 771         }
 772
 773         /* Update page if required */
 774
 775         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 776                 ret = yaffs_readpage_nolock(filp, pg);
 777
 778         if (ret)
 779                 goto out;
 780
 781         /* Happy path return */
 782         T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
 783
 784         return 0;
 785
 786 out:
 787         T(YAFFS_TRACE_OS, ("end yaffs_write_begin fail returning %d\n", ret));
 788         if (space_held)
 789                 yaffs_release_space(filp);
 790         if (pg) {
 791                 unlock_page(pg);
 792                 page_cache_release(pg);
 793         }
 794         return ret;
 795 }
 796
 797 #else
 798
 799 static int yaffs_prepare_write(struct file *f, struct page *pg,
 800                                 unsigned offset, unsigned to)
 801 {
 802         T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n"));
 803
 804         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 805                 return yaffs_readpage_nolock(f, pg);
 806         return 0;
 807 }
 808 #endif
 809
 810 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 811 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 812                                 loff_t pos, unsigned len, unsigned copied,
 813                                 struct page *pg, void *fsdadata)
 814 {
 815         int ret = 0;
 816         void *addr, *kva;
 817         uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
 818
 819         kva = kmap(pg);
 820         addr = kva + offset_into_page;
 821
 822         T(YAFFS_TRACE_OS,
 823                 ("yaffs_write_end addr %x pos %x nBytes %d\n",
 824                 (unsigned) addr,
 825                 (int)pos, copied));
 826
 827         ret = yaffs_file_write(filp, addr, copied, &pos);
 828
 829         if (ret != copied) {
 830                 T(YAFFS_TRACE_OS,
 831                         ("yaffs_write_end not same size ret %d  copied %d\n",
 832                         ret, copied));
 833                 SetPageError(pg);
 834                 ClearPageUptodate(pg);
 835         } else {
 836                 SetPageUptodate(pg);
 837         }
 838
 839         kunmap(pg);
 840
 841         yaffs_release_space(filp);
 842         unlock_page(pg);
 843         page_cache_release(pg);
 844         return ret;
 845 }
 846 #else
 847
 848 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 849                                 unsigned to)
 850 {
 851         void *addr, *kva;
 852
 853         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
 854         int nBytes = to - offset;
 855         int nWritten;
 856
 857         unsigned spos = pos;
 858         unsigned saddr;
 859
 860         kva = kmap(pg);
 861         addr = kva + offset;
 862
 863         saddr = (unsigned) addr;
 864
 865         T(YAFFS_TRACE_OS,
 866                 ("yaffs_commit_write addr %x pos %x nBytes %d\n",
 867                 saddr, spos, nBytes));
 868
 869         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
 870
 871         if (nWritten != nBytes) {
 872                 T(YAFFS_TRACE_OS,
 873                         ("yaffs_commit_write not same size nWritten %d  nBytes %d\n",
 874                         nWritten, nBytes));
 875                 SetPageError(pg);
 876                 ClearPageUptodate(pg);
 877         } else {
 878                 SetPageUptodate(pg);
 879         }
 880
 881         kunmap(pg);
 882
 883         T(YAFFS_TRACE_OS,
 884                 ("yaffs_commit_write returning %d\n",
 885                 nWritten == nBytes ? 0 : nWritten));
 886
 887         return nWritten == nBytes ? 0 : nWritten;
 888 }
 889 #endif
 890
 891
 892 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 893 {
 894         if (inode && obj) {
 895
 896
 897                 /* Check mode against the variant type and attempt to repair if broken. */
 898                 __u32 mode = obj->yst_mode;
 899                 switch (obj->variantType) {
 900                 case YAFFS_OBJECT_TYPE_FILE:
 901                         if (!S_ISREG(mode)) {
 902                                 obj->yst_mode &= ~S_IFMT;
 903                                 obj->yst_mode |= S_IFREG;
 904                         }
 905
 906                         break;
 907                 case YAFFS_OBJECT_TYPE_SYMLINK:
 908                         if (!S_ISLNK(mode)) {
 909                                 obj->yst_mode &= ~S_IFMT;
 910                                 obj->yst_mode |= S_IFLNK;
 911                         }
 912
 913                         break;
 914                 case YAFFS_OBJECT_TYPE_DIRECTORY:
 915                         if (!S_ISDIR(mode)) {
 916                                 obj->yst_mode &= ~S_IFMT;
 917                                 obj->yst_mode |= S_IFDIR;
 918                         }
 919
 920                         break;
 921                 case YAFFS_OBJECT_TYPE_UNKNOWN:
 922                 case YAFFS_OBJECT_TYPE_HARDLINK:
 923                 case YAFFS_OBJECT_TYPE_SPECIAL:
 924                 default:
 925                         /* TODO? */
 926                         break;
 927                 }
 928
 929                 inode->i_flags |= S_NOATIME;
 930
 931                 inode->i_ino = obj->objectId;
 932                 inode->i_mode = obj->yst_mode;
 933                 inode->i_uid = obj->yst_uid;
 934                 inode->i_gid = obj->yst_gid;
 935 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
 936                 inode->i_blksize = inode->i_sb->s_blocksize;
 937 #endif
 938 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 939
 940                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 941                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
 942                 inode->i_atime.tv_nsec = 0;
 943                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
 944                 inode->i_mtime.tv_nsec = 0;
 945                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
 946                 inode->i_ctime.tv_nsec = 0;
 947 #else
 948                 inode->i_rdev = obj->yst_rdev;
 949                 inode->i_atime = obj->yst_atime;
 950                 inode->i_mtime = obj->yst_mtime;
 951                 inode->i_ctime = obj->yst_ctime;
 952 #endif
 953                 inode->i_size = yaffs_GetObjectFileLength(obj);
 954                 inode->i_blocks = (inode->i_size + 511) >> 9;
 955
 956                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 957
 958                 T(YAFFS_TRACE_OS,
 959                         ("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 960                         inode->i_mode, inode->i_uid, inode->i_gid,
 961                         (int)inode->i_size, atomic_read(&inode->i_count)));
 962
 963                 switch (obj->yst_mode & S_IFMT) {
 964                 default:        /* fifo, device or socket */
 965 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 966                         init_special_inode(inode, obj->yst_mode,
 967                                         old_decode_dev(obj->yst_rdev));
 968 #else
 969                         init_special_inode(inode, obj->yst_mode,
 970                                         (dev_t) (obj->yst_rdev));
 971 #endif
 972                         break;
 973                 case S_IFREG:   /* file */
 974                         inode->i_op = &yaffs_file_inode_operations;
 975                         inode->i_fop = &yaffs_file_operations;
 976                         inode->i_mapping->a_ops =
 977                                 &yaffs_file_address_operations;
 978                         break;
 979                 case S_IFDIR:   /* directory */
 980                         inode->i_op = &yaffs_dir_inode_operations;
 981                         inode->i_fop = &yaffs_dir_operations;
 982                         break;
 983                 case S_IFLNK:   /* symlink */
 984                         inode->i_op = &yaffs_symlink_inode_operations;
 985                         break;
 986                 }
 987
 988                 yaffs_InodeToObjectLV(inode) = obj;
 989
 990                 obj->myInode = inode;
 991
 992         } else {
 993                 T(YAFFS_TRACE_OS,
 994                         ("yaffs_FileInode invalid parameters\n"));
 995         }
 996
 997 }
 998
 999 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1000                                 yaffs_Object *obj)
1001 {
1002         struct inode *inode;
1003
1004         if (!sb) {
1005                 T(YAFFS_TRACE_OS,
1006                         ("yaffs_get_inode for NULL super_block!!\n"));
1007                 return NULL;
1008
1009         }
1010
1011         if (!obj) {
1012                 T(YAFFS_TRACE_OS,
1013                         ("yaffs_get_inode for NULL object!!\n"));
1014                 return NULL;
1015
1016         }
1017
1018         T(YAFFS_TRACE_OS,
1019                 ("yaffs_get_inode for object %d\n", obj->objectId));
1020
1021         inode = Y_IGET(sb, obj->objectId);
1022         if (IS_ERR(inode))
1023                 return NULL;
1024
1025         /* NB Side effect: iget calls back to yaffs_read_inode(). */
1026         /* iget also increments the inode's i_count */
1027         /* NB You can't be holding grossLock or deadlock will happen! */
1028
1029         return inode;
1030 }
1031
1032 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1033                                 loff_t *pos)
1034 {
1035         yaffs_Object *obj;
1036         int nWritten, ipos;
1037         struct inode *inode;
1038         yaffs_Device *dev;
1039
1040         obj = yaffs_DentryToObject(f->f_dentry);
1041
1042         dev = obj->myDev;
1043
1044         yaffs_GrossLock(dev);
1045
1046         inode = f->f_dentry->d_inode;
1047
1048         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1049                 ipos = inode->i_size;
1050         else
1051                 ipos = *pos;
1052
1053         if (!obj)
1054                 T(YAFFS_TRACE_OS,
1055                         ("yaffs_file_write: hey obj is null!\n"));
1056         else
1057                 T(YAFFS_TRACE_OS,
1058                         ("yaffs_file_write about to write writing %zu bytes"
1059                         "to object %d at %d\n",
1060                         n, obj->objectId, ipos));
1061
1062         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
1063
1064         T(YAFFS_TRACE_OS,
1065                 ("yaffs_file_write writing %zu bytes, %d written at %d\n",
1066                 n, nWritten, ipos));
1067
1068         if (nWritten > 0) {
1069                 ipos += nWritten;
1070                 *pos = ipos;
1071                 if (ipos > inode->i_size) {
1072                         inode->i_size = ipos;
1073                         inode->i_blocks = (ipos + 511) >> 9;
1074
1075                         T(YAFFS_TRACE_OS,
1076                                 ("yaffs_file_write size updated to %d bytes, "
1077                                 "%d blocks\n",
1078                                 ipos, (int)(inode->i_blocks)));
1079                 }
1080
1081         }
1082         yaffs_GrossUnlock(dev);
1083         return (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
1084 }
1085
1086 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1087 /* For now we just assume few parallel writes and check against a small number. */
1088 /* Todo: need to do this with a counter to handle parallel reads better */
1089
1090 static ssize_t yaffs_hold_space(struct file *f)
1091 {
1092         yaffs_Object *obj;
1093         yaffs_Device *dev;
1094
1095         int nFreeChunks;
1096
1097
1098         obj = yaffs_DentryToObject(f->f_dentry);
1099
1100         dev = obj->myDev;
1101
1102         yaffs_GrossLock(dev);
1103
1104         nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
1105
1106         yaffs_GrossUnlock(dev);
1107
1108         return (nFreeChunks > 20) ? 1 : 0;
1109 }
1110
1111 static void yaffs_release_space(struct file *f)
1112 {
1113         yaffs_Object *obj;
1114         yaffs_Device *dev;
1115
1116
1117         obj = yaffs_DentryToObject(f->f_dentry);
1118
1119         dev = obj->myDev;
1120
1121         yaffs_GrossLock(dev);
1122
1123
1124         yaffs_GrossUnlock(dev);
1125 }
1126
1127 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1128 {
1129         yaffs_Object *obj;
1130         yaffs_Device *dev;
1131         struct inode *inode = f->f_dentry->d_inode;
1132         unsigned long offset, curoffs;
1133         struct ylist_head *i;
1134         yaffs_Object *l;
1135
1136         char name[YAFFS_MAX_NAME_LENGTH + 1];
1137
1138         obj = yaffs_DentryToObject(f->f_dentry);
1139         dev = obj->myDev;
1140
1141         yaffs_GrossLock(dev);
1142
1143         offset = f->f_pos;
1144
1145         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
1146
1147         if (offset == 0) {
1148                 T(YAFFS_TRACE_OS,
1149                         ("yaffs_readdir: entry . ino %d \n",
1150                         (int)inode->i_ino));
1151                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
1152                         goto out;
1153                 offset++;
1154                 f->f_pos++;
1155         }
1156         if (offset == 1) {
1157                 T(YAFFS_TRACE_OS,
1158                         ("yaffs_readdir: entry .. ino %d \n",
1159                         (int)f->f_dentry->d_parent->d_inode->i_ino));
1160                 if (filldir(dirent, "..", 2, offset,
1161                         f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
1162                         goto out;
1163                 offset++;
1164                 f->f_pos++;
1165         }
1166
1167         curoffs = 1;
1168
1169         /* If the directory has changed since the open or last call to
1170            readdir, rewind to after the 2 canned entries. */
1171
1172         if (f->f_version != inode->i_version) {
1173                 offset = 2;
1174                 f->f_pos = offset;
1175                 f->f_version = inode->i_version;
1176         }
1177
1178         ylist_for_each(i, &obj->variant.directoryVariant.children) {
1179                 curoffs++;
1180                 if (curoffs >= offset) {
1181                         l = ylist_entry(i, yaffs_Object, siblings);
1182
1183                         yaffs_GetObjectName(l, name,
1184                                             YAFFS_MAX_NAME_LENGTH + 1);
1185                         T(YAFFS_TRACE_OS,
1186                           ("yaffs_readdir: %s inode %d\n", name,
1187                            yaffs_GetObjectInode(l)));
1188
1189                         if (filldir(dirent,
1190                                         name,
1191                                         strlen(name),
1192                                         offset,
1193                                         yaffs_GetObjectInode(l),
1194                                         yaffs_GetObjectType(l)) < 0)
1195                                 goto up_and_out;
1196
1197                         offset++;
1198                         f->f_pos++;
1199                 }
1200         }
1201
1202 up_and_out:
1203 out:
1204         yaffs_GrossUnlock(dev);
1205
1206         return 0;
1207 }
1208
1209 /*
1210  * File creation. Allocate an inode, and we're done..
1211  */
1212
1213 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1214 #define YCRED(x) x
1215 #else
1216 #define YCRED(x) (x->cred)
1217 #endif
1218
1219 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1220 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1221                         dev_t rdev)
1222 #else
1223 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1224                         int rdev)
1225 #endif
1226 {
1227         struct inode *inode;
1228
1229         yaffs_Object *obj = NULL;
1230         yaffs_Device *dev;
1231
1232         yaffs_Object *parent = yaffs_InodeToObject(dir);
1233
1234         int error = -ENOSPC;
1235         uid_t uid = YCRED(current)->fsuid;
1236         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1237
1238         if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1239                 mode |= S_ISGID;
1240
1241         if (parent) {
1242                 T(YAFFS_TRACE_OS,
1243                         ("yaffs_mknod: parent object %d type %d\n",
1244                         parent->objectId, parent->variantType));
1245         } else {
1246                 T(YAFFS_TRACE_OS,
1247                         ("yaffs_mknod: could not get parent object\n"));
1248                 return -EPERM;
1249         }
1250
1251         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1252                         "mode %x dev %x\n",
1253                         dentry->d_name.name, mode, rdev));
1254
1255         dev = parent->myDev;
1256
1257         yaffs_GrossLock(dev);
1258
1259         switch (mode & S_IFMT) {
1260         default:
1261                 /* Special (socket, fifo, device...) */
1262                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
1263 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1264                 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1265                                 gid, old_encode_dev(rdev));
1266 #else
1267                 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1268                                 gid, rdev);
1269 #endif
1270                 break;
1271         case S_IFREG:           /* file          */
1272                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
1273                 obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1274                                 gid);
1275                 break;
1276         case S_IFDIR:           /* directory */
1277                 T(YAFFS_TRACE_OS,
1278                         ("yaffs_mknod: making directory\n"));
1279                 obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1280                                         uid, gid);
1281                 break;
1282         case S_IFLNK:           /* symlink */
1283                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
1284                 obj = NULL;     /* Do we ever get here? */
1285                 break;
1286         }
1287
1288         /* Can not call yaffs_get_inode() with gross lock held */
1289         yaffs_GrossUnlock(dev);
1290
1291         if (obj) {
1292                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1293                 d_instantiate(dentry, inode);
1294                 update_dir_time(dir);
1295                 T(YAFFS_TRACE_OS,
1296                         ("yaffs_mknod created object %d count = %d\n",
1297                         obj->objectId, atomic_read(&inode->i_count)));
1298                 error = 0;
1299         } else {
1300                 T(YAFFS_TRACE_OS,
1301                         ("yaffs_mknod failed making object\n"));
1302                 error = -ENOMEM;
1303         }
1304
1305         return error;
1306 }
1307
1308 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1309 {
1310         int retVal;
1311         T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
1312         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1313         return retVal;
1314 }
1315
1316 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1317 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1318                         struct nameidata *n)
1319 #else
1320 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1321 #endif
1322 {
1323         T(YAFFS_TRACE_OS, ("yaffs_create\n"));
1324         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1325 }
1326
1327 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1328 {
1329         int retVal;
1330
1331         yaffs_Device *dev;
1332
1333         T(YAFFS_TRACE_OS,
1334                 ("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1335                 dentry->d_name.name));
1336
1337         dev = yaffs_InodeToObject(dir)->myDev;
1338
1339         yaffs_GrossLock(dev);
1340
1341         retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1342
1343         if (retVal == YAFFS_OK) {
1344                 dentry->d_inode->i_nlink--;
1345                 dir->i_version++;
1346                 yaffs_GrossUnlock(dev);
1347                 mark_inode_dirty(dentry->d_inode);
1348                 update_dir_time(dir);
1349                 return 0;
1350         }
1351         yaffs_GrossUnlock(dev);
1352         return -ENOTEMPTY;
1353 }
1354
1355 /*
1356  * Create a link...
1357  */
1358 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1359                         struct dentry *dentry)
1360 {
1361         struct inode *inode = old_dentry->d_inode;
1362         yaffs_Object *obj = NULL;
1363         yaffs_Object *link = NULL;
1364         yaffs_Device *dev;
1365
1366         T(YAFFS_TRACE_OS, ("yaffs_link\n"));
1367
1368         obj = yaffs_InodeToObject(inode);
1369         dev = obj->myDev;
1370
1371         yaffs_GrossLock(dev);
1372
1373         if (!S_ISDIR(inode->i_mode))            /* Don't link directories */
1374                 link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1375                         obj);
1376
1377         if (link) {
1378                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1379                 d_instantiate(dentry, old_dentry->d_inode);
1380                 atomic_inc(&old_dentry->d_inode->i_count);
1381                 T(YAFFS_TRACE_OS,
1382                         ("yaffs_link link count %d i_count %d\n",
1383                         old_dentry->d_inode->i_nlink,
1384                         atomic_read(&old_dentry->d_inode->i_count)));
1385         }
1386
1387         yaffs_GrossUnlock(dev);
1388
1389         if (link){
1390                 update_dir_time(dir);
1391                 return 0;
1392         }
1393
1394         return -EPERM;
1395 }
1396
1397 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1398                                 const char *symname)
1399 {
1400         yaffs_Object *obj;
1401         yaffs_Device *dev;
1402         uid_t uid = YCRED(current)->fsuid;
1403         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1404
1405         T(YAFFS_TRACE_OS, ("yaffs_symlink\n"));
1406
1407         dev = yaffs_InodeToObject(dir)->myDev;
1408         yaffs_GrossLock(dev);
1409         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1410                                 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1411         yaffs_GrossUnlock(dev);
1412
1413         if (obj) {
1414                 struct inode *inode;
1415
1416                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1417                 d_instantiate(dentry, inode);
1418                 update_dir_time(dir);
1419                 T(YAFFS_TRACE_OS, ("symlink created OK\n"));
1420                 return 0;
1421         } else {
1422                 T(YAFFS_TRACE_OS, ("symlink not created\n"));
1423         }
1424
1425         return -ENOMEM;
1426 }
1427
1428 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1429                                 int datasync)
1430 {
1431
1432         yaffs_Object *obj;
1433         yaffs_Device *dev;
1434
1435         obj = yaffs_DentryToObject(dentry);
1436
1437         dev = obj->myDev;
1438
1439         T(YAFFS_TRACE_OS, ("yaffs_sync_object\n"));
1440         yaffs_GrossLock(dev);
1441         yaffs_FlushFile(obj, 1);
1442         yaffs_GrossUnlock(dev);
1443         return 0;
1444 }
1445
1446 /*
1447  * The VFS layer already does all the dentry stuff for rename.
1448  *
1449  * NB: POSIX says you can rename an object over an old object of the same name
1450  */
1451 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1452                         struct inode *new_dir, struct dentry *new_dentry)
1453 {
1454         yaffs_Device *dev;
1455         int retVal = YAFFS_FAIL;
1456         yaffs_Object *target;
1457
1458         T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
1459         dev = yaffs_InodeToObject(old_dir)->myDev;
1460
1461         yaffs_GrossLock(dev);
1462
1463         /* Check if the target is an existing directory that is not empty. */
1464         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1465                                 new_dentry->d_name.name);
1466
1467
1468
1469         if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1470                 !ylist_empty(&target->variant.directoryVariant.children)) {
1471
1472                 T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
1473
1474                 retVal = YAFFS_FAIL;
1475         } else {
1476                 /* Now does unlinking internally using shadowing mechanism */
1477                 T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
1478
1479                 retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1480                                 old_dentry->d_name.name,
1481                                 yaffs_InodeToObject(new_dir),
1482                                 new_dentry->d_name.name);
1483         }
1484         yaffs_GrossUnlock(dev);
1485
1486         if (retVal == YAFFS_OK) {
1487                 if (target) {
1488                         new_dentry->d_inode->i_nlink--;
1489                         mark_inode_dirty(new_dentry->d_inode);
1490                 }
1491
1492                 update_dir_time(old_dir);
1493                 if(old_dir != new_dir)
1494                         update_dir_time(new_dir);
1495                 return 0;
1496         } else {
1497                 return -ENOTEMPTY;
1498         }
1499 }
1500
1501 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1502 {
1503         struct inode *inode = dentry->d_inode;
1504         int error;
1505         yaffs_Device *dev;
1506
1507         T(YAFFS_TRACE_OS,
1508                 ("yaffs_setattr of object %d\n",
1509                 yaffs_InodeToObject(inode)->objectId));
1510
1511         error = inode_change_ok(inode, attr);
1512         if (error == 0) {
1513                 dev = yaffs_InodeToObject(inode)->myDev;
1514                 yaffs_GrossLock(dev);
1515                 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1516                                 YAFFS_OK) {
1517                         error = 0;
1518                 } else {
1519                         error = -EPERM;
1520                 }
1521                 yaffs_GrossUnlock(dev);
1522                 if (!error)
1523                         error = inode_setattr(inode, attr);
1524         }
1525         return error;
1526 }
1527
1528 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1529 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1530 {
1531         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1532         struct super_block *sb = dentry->d_sb;
1533 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1534 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1535 {
1536         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1537 #else
1538 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1539 {
1540         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1541 #endif
1542
1543         T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
1544
1545         yaffs_GrossLock(dev);
1546
1547         buf->f_type = YAFFS_MAGIC;
1548         buf->f_bsize = sb->s_blocksize;
1549         buf->f_namelen = 255;
1550
1551         if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
1552                 /* Do this if chunk size is not a power of 2 */
1553
1554                 uint64_t bytesInDev;
1555                 uint64_t bytesFree;
1556
1557                 bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock + 1))) *
1558                         ((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk));
1559
1560                 do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
1561                 buf->f_blocks = bytesInDev;
1562
1563                 bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
1564                         ((uint64_t)(dev->nDataBytesPerChunk));
1565
1566                 do_div(bytesFree, sb->s_blocksize);
1567
1568                 buf->f_bfree = bytesFree;
1569
1570         } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1571
1572                 buf->f_blocks =
1573                         (dev->endBlock - dev->startBlock + 1) *
1574                         dev->nChunksPerBlock /
1575                         (sb->s_blocksize / dev->nDataBytesPerChunk);
1576                 buf->f_bfree =
1577                         yaffs_GetNumberOfFreeChunks(dev) /
1578                         (sb->s_blocksize / dev->nDataBytesPerChunk);
1579         } else {
1580                 buf->f_blocks =
1581                         (dev->endBlock - dev->startBlock + 1) *
1582                         dev->nChunksPerBlock *
1583                         (dev->nDataBytesPerChunk / sb->s_blocksize);
1584
1585                 buf->f_bfree =
1586                         yaffs_GetNumberOfFreeChunks(dev) *
1587                         (dev->nDataBytesPerChunk / sb->s_blocksize);
1588         }
1589
1590         buf->f_files = 0;
1591         buf->f_ffree = 0;
1592         buf->f_bavail = buf->f_bfree;
1593
1594         yaffs_GrossUnlock(dev);
1595         return 0;
1596 }
1597
1598
1599 static int yaffs_do_sync_fs(struct super_block *sb)
1600 {
1601
1602         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1603         T(YAFFS_TRACE_OS, ("yaffs_do_sync_fs\n"));
1604
1605         if (sb->s_dirt) {
1606                 yaffs_GrossLock(dev);
1607
1608                 if (dev) {
1609                         yaffs_FlushEntireDeviceCache(dev);
1610                         yaffs_CheckpointSave(dev);
1611                 }
1612
1613                 yaffs_GrossUnlock(dev);
1614
1615                 sb->s_dirt = 0;
1616         }
1617         return 0;
1618 }
1619
1620
1621 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1622 static void yaffs_write_super(struct super_block *sb)
1623 #else
1624 static int yaffs_write_super(struct super_block *sb)
1625 #endif
1626 {
1627
1628         T(YAFFS_TRACE_OS, ("yaffs_write_super\n"));
1629         if (yaffs_auto_checkpoint >= 2)
1630                 yaffs_do_sync_fs(sb);
1631 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
1632         return 0;
1633 #endif
1634 }
1635
1636
1637 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1638 static int yaffs_sync_fs(struct super_block *sb, int wait)
1639 #else
1640 static int yaffs_sync_fs(struct super_block *sb)
1641 #endif
1642 {
1643         T(YAFFS_TRACE_OS, ("yaffs_sync_fs\n"));
1644
1645         if (yaffs_auto_checkpoint >= 1)
1646                 yaffs_do_sync_fs(sb);
1647
1648         return 0;
1649 }
1650
1651 #ifdef YAFFS_USE_OWN_IGET
1652
1653 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
1654 {
1655         struct inode *inode;
1656         yaffs_Object *obj;
1657         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1658
1659         T(YAFFS_TRACE_OS,
1660                 ("yaffs_iget for %lu\n", ino));
1661
1662         inode = iget_locked(sb, ino);
1663         if (!inode)
1664                 return ERR_PTR(-ENOMEM);
1665         if (!(inode->i_state & I_NEW))
1666                 return inode;
1667
1668         /* NB This is called as a side effect of other functions, but
1669          * we had to release the lock to prevent deadlocks, so
1670          * need to lock again.
1671          */
1672
1673         yaffs_GrossLock(dev);
1674
1675         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1676
1677         yaffs_FillInodeFromObject(inode, obj);
1678
1679         yaffs_GrossUnlock(dev);
1680
1681         unlock_new_inode(inode);
1682         return inode;
1683 }
1684
1685 #else
1686
1687 static void yaffs_read_inode(struct inode *inode)
1688 {
1689         /* NB This is called as a side effect of other functions, but
1690          * we had to release the lock to prevent deadlocks, so
1691          * need to lock again.
1692          */
1693
1694         yaffs_Object *obj;
1695         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1696
1697         T(YAFFS_TRACE_OS,
1698                 ("yaffs_read_inode for %d\n", (int)inode->i_ino));
1699
1700         yaffs_GrossLock(dev);
1701
1702         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1703
1704         yaffs_FillInodeFromObject(inode, obj);
1705
1706         yaffs_GrossUnlock(dev);
1707 }
1708
1709 #endif
1710
1711 static YLIST_HEAD(yaffs_dev_list);
1712
1713 #if 0 /* not used */
1714 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1715 {
1716         yaffs_Device    *dev = yaffs_SuperToDevice(sb);
1717
1718         if (*flags & MS_RDONLY) {
1719                 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1720
1721                 T(YAFFS_TRACE_OS,
1722                         ("yaffs_remount_fs: %s: RO\n", dev->name));
1723
1724                 yaffs_GrossLock(dev);
1725
1726                 yaffs_FlushEntireDeviceCache(dev);
1727
1728                 yaffs_CheckpointSave(dev);
1729
1730                 if (mtd->sync)
1731                         mtd->sync(mtd);
1732
1733                 yaffs_GrossUnlock(dev);
1734         } else {
1735                 T(YAFFS_TRACE_OS,
1736                         ("yaffs_remount_fs: %s: RW\n", dev->name));
1737         }
1738
1739         return 0;
1740 }
1741 #endif
1742
1743 static void yaffs_put_super(struct super_block *sb)
1744 {
1745         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1746
1747         T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
1748
1749         yaffs_GrossLock(dev);
1750
1751         yaffs_FlushEntireDeviceCache(dev);
1752
1753         yaffs_CheckpointSave(dev);
1754
1755         if (dev->putSuperFunc)
1756                 dev->putSuperFunc(sb);
1757
1758         yaffs_Deinitialise(dev);
1759
1760         yaffs_GrossUnlock(dev);
1761
1762         /* we assume this is protected by lock_kernel() in mount/umount */
1763         ylist_del(&dev->devList);
1764
1765         if (dev->spareBuffer) {
1766                 YFREE(dev->spareBuffer);
1767                 dev->spareBuffer = NULL;
1768         }
1769
1770         kfree(dev);
1771 }
1772
1773
1774 static void yaffs_MTDPutSuper(struct super_block *sb)
1775 {
1776         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1777
1778         if (mtd->sync)
1779                 mtd->sync(mtd);
1780
1781         put_mtd_device(mtd);
1782 }
1783
1784
1785 static void yaffs_MarkSuperBlockDirty(void *vsb)
1786 {
1787         struct super_block *sb = (struct super_block *)vsb;
1788
1789         T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb));
1790         if (sb)
1791                 sb->s_dirt = 1;
1792 }
1793
1794 typedef struct {
1795         int inband_tags;
1796         int skip_checkpoint_read;
1797         int skip_checkpoint_write;
1798         int no_cache;
1799 } yaffs_options;
1800
1801 #define MAX_OPT_LEN 20
1802 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1803 {
1804         char cur_opt[MAX_OPT_LEN + 1];
1805         int p;
1806         int error = 0;
1807
1808         /* Parse through the options which is a comma seperated list */
1809
1810         while (options_str && *options_str && !error) {
1811                 memset(cur_opt, 0, MAX_OPT_LEN + 1);
1812                 p = 0;
1813
1814                 while (*options_str && *options_str != ',') {
1815                         if (p < MAX_OPT_LEN) {
1816                                 cur_opt[p] = *options_str;
1817                                 p++;
1818                         }
1819                         options_str++;
1820                 }
1821
1822                 if (!strcmp(cur_opt, "inband-tags"))
1823                         options->inband_tags = 1;
1824                 else if (!strcmp(cur_opt, "no-cache"))
1825                         options->no_cache = 1;
1826                 else if (!strcmp(cur_opt, "no-checkpoint-read"))
1827                         options->skip_checkpoint_read = 1;
1828                 else if (!strcmp(cur_opt, "no-checkpoint-write"))
1829                         options->skip_checkpoint_write = 1;
1830                 else if (!strcmp(cur_opt, "no-checkpoint")) {
1831                         options->skip_checkpoint_read = 1;
1832                         options->skip_checkpoint_write = 1;
1833                 } else {
1834                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
1835                                         cur_opt);
1836                         error = 1;
1837                 }
1838         }
1839
1840         return error;
1841 }
1842
1843 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1844                                                 struct super_block *sb,
1845                                                 void *data, int silent)
1846 {
1847         int nBlocks;
1848         struct inode *inode = NULL;
1849         struct dentry *root;
1850         yaffs_Device *dev = 0;
1851         char devname_buf[BDEVNAME_SIZE + 1];
1852         struct mtd_info *mtd;
1853         int err;
1854         char *data_str = (char *)data;
1855
1856         yaffs_options options;
1857
1858         sb->s_magic = YAFFS_MAGIC;
1859         sb->s_op = &yaffs_super_ops;
1860         sb->s_flags |= MS_NOATIME;
1861
1862         if (!sb)
1863                 printk(KERN_INFO "yaffs: sb is NULL\n");
1864         else if (!sb->s_dev)
1865                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1866         else if (!yaffs_devname(sb, devname_buf))
1867                 printk(KERN_INFO "yaffs: devname is NULL\n");
1868         else
1869                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1870                        sb->s_dev,
1871                        yaffs_devname(sb, devname_buf));
1872
1873         if (!data_str)
1874                 data_str = "";
1875
1876         printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
1877
1878         memset(&options, 0, sizeof(options));
1879
1880         if (yaffs_parse_options(&options, data_str)) {
1881                 /* Option parsing failed */
1882                 return NULL;
1883         }
1884
1885
1886         sb->s_blocksize = PAGE_CACHE_SIZE;
1887         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1888         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1889         T(YAFFS_TRACE_OS,
1890           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1891
1892 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1893         T(YAFFS_TRACE_OS,
1894           ("yaffs: Write verification disabled. All guarantees "
1895            "null and void\n"));
1896 #endif
1897
1898         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1899                                "\"%s\"\n",
1900                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
1901                                yaffs_devname(sb, devname_buf)));
1902
1903         /* Check it's an mtd device..... */
1904         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1905                 return NULL;    /* This isn't an mtd device */
1906
1907         /* Get the device */
1908         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1909         if (!mtd) {
1910                 T(YAFFS_TRACE_ALWAYS,
1911                   ("yaffs: MTD device #%u doesn't appear to exist\n",
1912                    MINOR(sb->s_dev)));
1913                 return NULL;
1914         }
1915         /* Check it's NAND */
1916         if (mtd->type != MTD_NANDFLASH) {
1917                 T(YAFFS_TRACE_ALWAYS,
1918                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1919                 return NULL;
1920         }
1921
1922         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1923         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1924         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1925         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1926         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1927         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1928         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1929         T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1930         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1931         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1932 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1933         T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
1934 #else
1935         T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
1936 #endif
1937
1938 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1939
1940         if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
1941                 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
1942                 yaffsVersion = 2;
1943         }
1944
1945         /* Added NCB 26/5/2006 for completeness */
1946         if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
1947                 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
1948                 yaffsVersion = 1;
1949         }
1950
1951 #endif
1952
1953         if (yaffsVersion == 2) {
1954                 /* Check for version 2 style functions */
1955                 if (!mtd->erase ||
1956                     !mtd->block_isbad ||
1957                     !mtd->block_markbad ||
1958                     !mtd->read ||
1959                     !mtd->write ||
1960 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1961                     !mtd->read_oob || !mtd->write_oob) {
1962 #else
1963                     !mtd->write_ecc ||
1964                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1965 #endif
1966                         T(YAFFS_TRACE_ALWAYS,
1967                           ("yaffs: MTD device does not support required "
1968                            "functions\n"));;
1969                         return NULL;
1970                 }
1971
1972                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1973                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
1974                     !options.inband_tags) {
1975                         T(YAFFS_TRACE_ALWAYS,
1976                           ("yaffs: MTD device does not have the "
1977                            "right page sizes\n"));
1978                         return NULL;
1979                 }
1980         } else {
1981                 /* Check for V1 style functions */
1982                 if (!mtd->erase ||
1983                     !mtd->read ||
1984                     !mtd->write ||
1985 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1986                     !mtd->read_oob || !mtd->write_oob) {
1987 #else
1988                     !mtd->write_ecc ||
1989                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1990 #endif
1991                         T(YAFFS_TRACE_ALWAYS,
1992                           ("yaffs: MTD device does not support required "
1993                            "functions\n"));;
1994                         return NULL;
1995                 }
1996
1997                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
1998                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1999                         T(YAFFS_TRACE_ALWAYS,
2000                           ("yaffs: MTD device does not support have the "
2001                            "right page sizes\n"));
2002                         return NULL;
2003                 }
2004         }
2005
2006         /* OK, so if we got here, we have an MTD that's NAND and looks
2007          * like it has the right capabilities
2008          * Set the yaffs_Device up for mtd
2009          */
2010
2011 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2012         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2013 #else
2014         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2015 #endif
2016         if (!dev) {
2017                 /* Deep shit could not allocate device structure */
2018                 T(YAFFS_TRACE_ALWAYS,
2019                   ("yaffs_read_super: Failed trying to allocate "
2020                    "yaffs_Device. \n"));
2021                 return NULL;
2022         }
2023
2024         memset(dev, 0, sizeof(yaffs_Device));
2025         dev->genericDevice = mtd;
2026         dev->name = mtd->name;
2027
2028         /* Set up the memory size parameters.... */
2029
2030         nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2031
2032         dev->startBlock = 0;
2033         dev->endBlock = nBlocks - 1;
2034         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
2035         dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
2036         dev->nReservedBlocks = 5;
2037         dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
2038         dev->inbandTags = options.inband_tags;
2039
2040         /* ... and the functions. */
2041         if (yaffsVersion == 2) {
2042                 dev->writeChunkWithTagsToNAND =
2043                     nandmtd2_WriteChunkWithTagsToNAND;
2044                 dev->readChunkWithTagsFromNAND =
2045                     nandmtd2_ReadChunkWithTagsFromNAND;
2046                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
2047                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
2048                 dev->spareBuffer = YMALLOC(mtd->oobsize);
2049                 dev->isYaffs2 = 1;
2050 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2051                 dev->totalBytesPerChunk = mtd->writesize;
2052                 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
2053 #else
2054                 dev->totalBytesPerChunk = mtd->oobblock;
2055                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
2056 #endif
2057                 nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2058
2059                 dev->startBlock = 0;
2060                 dev->endBlock = nBlocks - 1;
2061         } else {
2062 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2063                 /* use the MTD interface in yaffs_mtdif1.c */
2064                 dev->writeChunkWithTagsToNAND =
2065                         nandmtd1_WriteChunkWithTagsToNAND;
2066                 dev->readChunkWithTagsFromNAND =
2067                         nandmtd1_ReadChunkWithTagsFromNAND;
2068                 dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
2069                 dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
2070 #else
2071                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
2072                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
2073 #endif
2074                 dev->isYaffs2 = 0;
2075         }
2076         /* ... and common functions */
2077         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
2078         dev->initialiseNAND = nandmtd_InitialiseNAND;
2079
2080         dev->putSuperFunc = yaffs_MTDPutSuper;
2081
2082         dev->superBlock = (void *)sb;
2083         dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
2084
2085
2086 #ifndef CONFIG_YAFFS_DOES_ECC
2087         dev->useNANDECC = 1;
2088 #endif
2089
2090 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2091         dev->wideTnodesDisabled = 1;
2092 #endif
2093
2094         dev->skipCheckpointRead = options.skip_checkpoint_read;
2095         dev->skipCheckpointWrite = options.skip_checkpoint_write;
2096
2097         /* we assume this is protected by lock_kernel() in mount/umount */
2098         ylist_add_tail(&dev->devList, &yaffs_dev_list);
2099
2100         init_MUTEX(&dev->grossLock);
2101
2102         yaffs_GrossLock(dev);
2103
2104         err = yaffs_GutsInitialise(dev);
2105
2106         T(YAFFS_TRACE_OS,
2107           ("yaffs_read_super: guts initialised %s\n",
2108            (err == YAFFS_OK) ? "OK" : "FAILED"));
2109
2110         /* Release lock before yaffs_get_inode() */
2111         yaffs_GrossUnlock(dev);
2112
2113         /* Create root inode */
2114         if (err == YAFFS_OK)
2115                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
2116                                         yaffs_Root(dev));
2117
2118         if (!inode)
2119                 return NULL;
2120
2121         inode->i_op = &yaffs_dir_inode_operations;
2122         inode->i_fop = &yaffs_dir_operations;
2123
2124         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
2125
2126         root = d_alloc_root(inode);
2127
2128         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
2129
2130         if (!root) {
2131                 iput(inode);
2132                 return NULL;
2133         }
2134         sb->s_root = root;
2135         sb->s_dirt = !dev->isCheckpointed;
2136         T(YAFFS_TRACE_ALWAYS,
2137           ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
2138
2139         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
2140         return sb;
2141 }
2142
2143
2144 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2145 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2146                                          int silent)
2147 {
2148         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2149 }
2150
2151 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2152 static int yaffs_read_super(struct file_system_type *fs,
2153                             int flags, const char *dev_name,
2154                             void *data, struct vfsmount *mnt)
2155 {
2156
2157         return get_sb_bdev(fs, flags, dev_name, data,
2158                            yaffs_internal_read_super_mtd, mnt);
2159 }
2160 #else
2161 static struct super_block *yaffs_read_super(struct file_system_type *fs,
2162                                             int flags, const char *dev_name,
2163                                             void *data)
2164 {
2165
2166         return get_sb_bdev(fs, flags, dev_name, data,
2167                            yaffs_internal_read_super_mtd);
2168 }
2169 #endif
2170
2171 static struct file_system_type yaffs_fs_type = {
2172         .owner = THIS_MODULE,
2173         .name = "yaffs",
2174         .get_sb = yaffs_read_super,
2175         .kill_sb = kill_block_super,
2176         .fs_flags = FS_REQUIRES_DEV,
2177 };
2178 #else
2179 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
2180                                             int silent)
2181 {
2182         return yaffs_internal_read_super(1, sb, data, silent);
2183 }
2184
2185 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
2186                       FS_REQUIRES_DEV);
2187 #endif
2188
2189
2190 #ifdef CONFIG_YAFFS_YAFFS2
2191
2192 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2193 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2194                                           int silent)
2195 {
2196         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2197 }
2198
2199 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2200 static int yaffs2_read_super(struct file_system_type *fs,
2201                         int flags, const char *dev_name, void *data,
2202                         struct vfsmount *mnt)
2203 {
2204         return get_sb_bdev(fs, flags, dev_name, data,
2205                         yaffs2_internal_read_super_mtd, mnt);
2206 }
2207 #else
2208 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
2209                                              int flags, const char *dev_name,
2210                                              void *data)
2211 {
2212
2213         return get_sb_bdev(fs, flags, dev_name, data,
2214                            yaffs2_internal_read_super_mtd);
2215 }
2216 #endif
2217
2218 static struct file_system_type yaffs2_fs_type = {
2219         .owner = THIS_MODULE,
2220         .name = "yaffs2",
2221         .get_sb = yaffs2_read_super,
2222         .kill_sb = kill_block_super,
2223         .fs_flags = FS_REQUIRES_DEV,
2224 };
2225 #else
2226 static struct super_block *yaffs2_read_super(struct super_block *sb,
2227                                              void *data, int silent)
2228 {
2229         return yaffs_internal_read_super(2, sb, data, silent);
2230 }
2231
2232 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
2233                       FS_REQUIRES_DEV);
2234 #endif
2235
2236 #endif                          /* CONFIG_YAFFS_YAFFS2 */
2237
2238 static struct proc_dir_entry *my_proc_entry;
2239
2240 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
2241 {
2242         buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
2243         buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
2244         buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
2245         buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
2246         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
2247         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
2248         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
2249         buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
2250         buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2251         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2252         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2253         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2254         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2255         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2256         buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
2257         buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
2258         buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
2259         buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
2260         buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
2261         buf += sprintf(buf, "passiveGCs......... %d\n",
2262                     dev->passiveGarbageCollections);
2263         buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
2264         buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
2265         buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
2266         buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
2267         buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
2268         buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
2269         buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
2270         buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
2271         buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
2272         buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
2273         buf +=
2274             sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
2275         buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
2276         buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
2277         buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);
2278
2279         return buf;
2280 }
2281
2282 static int yaffs_proc_read(char *page,
2283                            char **start,
2284                            off_t offset, int count, int *eof, void *data)
2285 {
2286         struct ylist_head *item;
2287         char *buf = page;
2288         int step = offset;
2289         int n = 0;
2290
2291         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2292          * We use 'offset' (*ppos) to indicate where we are in devList.
2293          * This also assumes the user has posted a read buffer large
2294          * enough to hold the complete output; but that's life in /proc.
2295          */
2296
2297         *(int *)start = 1;
2298
2299         /* Print header first */
2300         if (step == 0) {
2301                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2302                                "\n%s\n%s\n", yaffs_fs_c_version,
2303                                yaffs_guts_c_version);
2304         }
2305
2306         /* hold lock_kernel while traversing yaffs_dev_list */
2307         lock_kernel();
2308
2309         /* Locate and print the Nth entry.  Order N-squared but N is small. */
2310         ylist_for_each(item, &yaffs_dev_list) {
2311                 yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
2312                 if (n < step) {
2313                         n++;
2314                         continue;
2315                 }
2316                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2317                 buf = yaffs_dump_dev(buf, dev);
2318                 break;
2319         }
2320         unlock_kernel();
2321
2322         return buf - page < count ? buf - page : count;
2323 }
2324
2325 /**
2326  * Set the verbosity of the warnings and error messages.
2327  *
2328  * Note that the names can only be a..z or _ with the current code.
2329  */
2330
2331 static struct {
2332         char *mask_name;
2333         unsigned mask_bitfield;
2334 } mask_flags[] = {
2335         {"allocate", YAFFS_TRACE_ALLOCATE},
2336         {"always", YAFFS_TRACE_ALWAYS},
2337         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2338         {"buffers", YAFFS_TRACE_BUFFERS},
2339         {"bug", YAFFS_TRACE_BUG},
2340         {"checkpt", YAFFS_TRACE_CHECKPOINT},
2341         {"deletion", YAFFS_TRACE_DELETION},
2342         {"erase", YAFFS_TRACE_ERASE},
2343         {"error", YAFFS_TRACE_ERROR},
2344         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2345         {"gc", YAFFS_TRACE_GC},
2346         {"mtd", YAFFS_TRACE_MTD},
2347         {"nandaccess", YAFFS_TRACE_NANDACCESS},
2348         {"os", YAFFS_TRACE_OS},
2349         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2350         {"scan", YAFFS_TRACE_SCAN},
2351         {"tracing", YAFFS_TRACE_TRACING},
2352
2353         {"verify", YAFFS_TRACE_VERIFY},
2354         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2355         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2356         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2357
2358         {"write", YAFFS_TRACE_WRITE},
2359         {"all", 0xffffffff},
2360         {"none", 0},
2361         {NULL, 0},
2362 };
2363
2364 #define MAX_MASK_NAME_LENGTH 40
2365 static int yaffs_proc_write(struct file *file, const char *buf,
2366                                          unsigned long count, void *data)
2367 {
2368         unsigned rg = 0, mask_bitfield;
2369         char *end;
2370         char *mask_name;
2371         const char *x;
2372         char substring[MAX_MASK_NAME_LENGTH + 1];
2373         int i;
2374         int done = 0;
2375         int add, len = 0;
2376         int pos = 0;
2377
2378         rg = yaffs_traceMask;
2379
2380         while (!done && (pos < count)) {
2381                 done = 1;
2382                 while ((pos < count) && isspace(buf[pos]))
2383                         pos++;
2384
2385                 switch (buf[pos]) {
2386                 case '+':
2387                 case '-':
2388                 case '=':
2389                         add = buf[pos];
2390                         pos++;
2391                         break;
2392
2393                 default:
2394                         add = ' ';
2395                         break;
2396                 }
2397                 mask_name = NULL;
2398
2399                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2400
2401                 if (end > buf + pos) {
2402                         mask_name = "numeral";
2403                         len = end - (buf + pos);
2404                         pos += len;
2405                         done = 0;
2406                 } else {
2407                         for (x = buf + pos, i = 0;
2408                             (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
2409                             i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2410                                 substring[i] = *x;
2411                         substring[i] = '\0';
2412
2413                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2414                                 if (strcmp(substring, mask_flags[i].mask_name) == 0) {
2415                                         mask_name = mask_flags[i].mask_name;
2416                                         mask_bitfield = mask_flags[i].mask_bitfield;
2417                                         done = 0;
2418                                         break;
2419                                 }
2420                         }
2421                 }
2422
2423                 if (mask_name != NULL) {
2424                         done = 0;
2425                         switch (add) {
2426                         case '-':
2427                                 rg &= ~mask_bitfield;
2428                                 break;
2429                         case '+':
2430                                 rg |= mask_bitfield;
2431                                 break;
2432                         case '=':
2433                                 rg = mask_bitfield;
2434                                 break;
2435                         default:
2436                                 rg |= mask_bitfield;
2437                                 break;
2438                         }
2439                 }
2440         }
2441
2442         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2443
2444         printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
2445
2446         if (rg & YAFFS_TRACE_ALWAYS) {
2447                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2448                         char flag;
2449                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2450                         printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
2451                 }
2452         }
2453
2454         return count;
2455 }
2456
2457 /* Stuff to handle installation of file systems */
2458 struct file_system_to_install {
2459         struct file_system_type *fst;
2460         int installed;
2461 };
2462
2463 static struct file_system_to_install fs_to_install[] = {
2464         {&yaffs_fs_type, 0},
2465         {&yaffs2_fs_type, 0},
2466         {NULL, 0}
2467 };
2468
2469 static int __init init_yaffs_fs(void)
2470 {
2471         int error = 0;
2472         struct file_system_to_install *fsinst;
2473
2474         T(YAFFS_TRACE_ALWAYS,
2475           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2476
2477         /* Install the proc_fs entry */
2478         my_proc_entry = create_proc_entry("yaffs",
2479                                                S_IRUGO | S_IFREG,
2480                                                YPROC_ROOT);
2481
2482         if (my_proc_entry) {
2483                 my_proc_entry->write_proc = yaffs_proc_write;
2484                 my_proc_entry->read_proc = yaffs_proc_read;
2485                 my_proc_entry->data = NULL;
2486         } else
2487                 return -ENOMEM;
2488
2489         /* Now add the file system entries */
2490
2491         fsinst = fs_to_install;
2492
2493         while (fsinst->fst && !error) {
2494                 error = register_filesystem(fsinst->fst);
2495                 if (!error)
2496                         fsinst->installed = 1;
2497                 fsinst++;
2498         }
2499
2500         /* Any errors? uninstall  */
2501         if (error) {
2502                 fsinst = fs_to_install;
2503
2504                 while (fsinst->fst) {
2505                         if (fsinst->installed) {
2506                                 unregister_filesystem(fsinst->fst);
2507                                 fsinst->installed = 0;
2508                         }
2509                         fsinst++;
2510                 }
2511         }
2512
2513         return error;
2514 }
2515
2516 static void __exit exit_yaffs_fs(void)
2517 {
2518
2519         struct file_system_to_install *fsinst;
2520
2521         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2522                                " removing. \n"));
2523
2524         remove_proc_entry("yaffs", YPROC_ROOT);
2525
2526         fsinst = fs_to_install;
2527
2528         while (fsinst->fst) {
2529                 if (fsinst->installed) {
2530                         unregister_filesystem(fsinst->fst);
2531                         fsinst->installed = 0;
2532                 }
2533                 fsinst++;
2534         }
2535 }
2536
2537 module_init(init_yaffs_fs)
2538 module_exit(exit_yaffs_fs)
2539
2540 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2541 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2542 MODULE_LICENSE("GPL");