target/linux/generic-2.6/files/fs/yaffs2/yaffs_fs.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  * Acknowledgements:
   9  * Luc van OostenRyck for numerous patches.
  10  * Nick Bane for numerous patches.
  11  * Nick Bane for 2.5/2.6 integration.
  12  * Andras Toth for mknod rdev issue.
  13  * Michael Fischer for finding the problem with inode inconsistency.
  14  * Some code bodily lifted from JFFS
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 /*
  22  *
  23  * This is the file system front-end to YAFFS that hooks it up to
  24  * the VFS.
  25  *
  26  * Special notes:
  27  * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
  28  *         this superblock
  29  * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this
  30  *         superblock
  31  * >> inode->u.generic_ip points to the associated yaffs_Object.
  32  */
  33
  34 const char *yaffs_fs_c_version =
  35     "$Id: yaffs_fs.c,v 1.63 2007-09-19 20:35:40 imcd Exp $";
  36 extern const char *yaffs_guts_c_version;
  37
  38 #include <linux/version.h>
  39 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
  40 #include <linux/config.h>
  41 #endif
  42 #include <linux/kernel.h>
  43 #include <linux/module.h>
  44 #include <linux/slab.h>
  45 #include <linux/init.h>
  46 #include <linux/list.h>
  47 #include <linux/fs.h>
  48 #include <linux/proc_fs.h>
  49 #include <linux/smp_lock.h>
  50 #include <linux/pagemap.h>
  51 #include <linux/mtd/mtd.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/string.h>
  54 #include <linux/ctype.h>
  55
  56 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  57
  58 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  59 #include <asm/statfs.h>
  60 #define UnlockPage(p) unlock_page(p)
  61 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  62
  63 /* FIXME: use sb->s_id instead ? */
  64 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)
  65
  66 #else
  67
  68 #include <linux/locks.h>
  69 #define BDEVNAME_SIZE           0
  70 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
  71
  72 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  73 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
  74 #define __user
  75 #endif
  76
  77 #endif
  78
  79 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  80 #define WRITE_SIZE_STR "writesize"
  81 #define WRITE_SIZE(mtd) (mtd)->writesize
  82 #else
  83 #define WRITE_SIZE_STR "oobblock"
  84 #define WRITE_SIZE(mtd) (mtd)->oobblock
  85 #endif
  86
  87 #include <asm/uaccess.h>
  88
  89 #include "yportenv.h"
  90 #include "yaffs_guts.h"
  91
  92 #include <linux/mtd/mtd.h>
  93 #include "yaffs_mtdif.h"
  94 #include "yaffs_mtdif1.h"
  95 #include "yaffs_mtdif2.h"
  96
  97 unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
  98 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
  99
 100 /* Module Parameters */
 101 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 102 module_param(yaffs_traceMask,uint,0644);
 103 module_param(yaffs_wr_attempts,uint,0644);
 104 #else
 105 MODULE_PARM(yaffs_traceMask,"i");
 106 MODULE_PARM(yaffs_wr_attempts,"i");
 107 #endif
 108
 109 /*#define T(x) printk x */
 110
 111 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 112 #define yaffs_InodeToObjectLV(iptr) (iptr)->i_private
 113 #else
 114 #define yaffs_InodeToObjectLV(iptr) (iptr)->u.generic_ip
 115 #endif
 116
 117 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
 118 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
 119
 120 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 121 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
 122 #else
 123 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 124 #endif
 125
 126 static void yaffs_put_super(struct super_block *sb);
 127
 128 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 129                                 loff_t * pos);
 130
 131 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 132 static int yaffs_file_flush(struct file *file, fl_owner_t id);
 133 #else
 134 static int yaffs_file_flush(struct file *file);
 135 #endif
 136
 137 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 138                              int datasync);
 139
 140 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 141
 142 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 143 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 144                         struct nameidata *n);
 145 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 146                                    struct nameidata *n);
 147 #else
 148 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 149 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 150 #endif
 151 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 152                       struct dentry *dentry);
 153 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 154 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 155                          const char *symname);
 156 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 157
 158 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 159 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 160                        dev_t dev);
 161 #else
 162 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 163                        int dev);
 164 #endif
 165 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 166                         struct inode *new_dir, struct dentry *new_dentry);
 167 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 168
 169 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 170 static int yaffs_sync_fs(struct super_block *sb, int wait);
 171 static void yaffs_write_super(struct super_block *sb);
 172 #else
 173 static int yaffs_sync_fs(struct super_block *sb);
 174 static int yaffs_write_super(struct super_block *sb);
 175 #endif
 176
 177 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 178 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
 179 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 180 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 181 #else
 182 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 183 #endif
 184 static void yaffs_read_inode(struct inode *inode);
 185
 186 static void yaffs_put_inode(struct inode *inode);
 187 static void yaffs_delete_inode(struct inode *);
 188 static void yaffs_clear_inode(struct inode *);
 189
 190 static int yaffs_readpage(struct file *file, struct page *page);
 191 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 192 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 193 #else
 194 static int yaffs_writepage(struct page *page);
 195 #endif
 196 static int yaffs_prepare_write(struct file *f, struct page *pg,
 197                                unsigned offset, unsigned to);
 198 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 199                               unsigned to);
 200
 201 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 202                           int buflen);
 203 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 204 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 205 #else
 206 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 207 #endif
 208
 209 static struct address_space_operations yaffs_file_address_operations = {
 210         .readpage = yaffs_readpage,
 211         .writepage = yaffs_writepage,
 212         .prepare_write = yaffs_prepare_write,
 213         .commit_write = yaffs_commit_write,
 214 };
 215
 216 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,22))
 217 static struct file_operations yaffs_file_operations = {
 218         .read = do_sync_read,
 219         .write = do_sync_write,
 220         .aio_read = generic_file_aio_read,
 221         .aio_write = generic_file_aio_write,
 222         .mmap = generic_file_mmap,
 223         .flush = yaffs_file_flush,
 224         .fsync = yaffs_sync_object,
 225         .splice_read = generic_file_splice_read,
 226         .splice_write = generic_file_splice_write,
 227 };
 228
 229 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 230
 231 static struct file_operations yaffs_file_operations = {
 232         .read = do_sync_read,
 233         .write = do_sync_write,
 234         .aio_read = generic_file_aio_read,
 235         .aio_write = generic_file_aio_write,
 236         .mmap = generic_file_mmap,
 237         .flush = yaffs_file_flush,
 238         .fsync = yaffs_sync_object,
 239         .sendfile = generic_file_sendfile,
 240 };
 241
 242 #else
 243
 244 static struct file_operations yaffs_file_operations = {
 245         .read = generic_file_read,
 246         .write = generic_file_write,
 247         .mmap = generic_file_mmap,
 248         .flush = yaffs_file_flush,
 249         .fsync = yaffs_sync_object,
 250 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 251         .sendfile = generic_file_sendfile,
 252 #endif
 253 };
 254 #endif
 255
 256 static struct inode_operations yaffs_file_inode_operations = {
 257         .setattr = yaffs_setattr,
 258 };
 259
 260 static struct inode_operations yaffs_symlink_inode_operations = {
 261         .readlink = yaffs_readlink,
 262         .follow_link = yaffs_follow_link,
 263         .setattr = yaffs_setattr,
 264 };
 265
 266 static struct inode_operations yaffs_dir_inode_operations = {
 267         .create = yaffs_create,
 268         .lookup = yaffs_lookup,
 269         .link = yaffs_link,
 270         .unlink = yaffs_unlink,
 271         .symlink = yaffs_symlink,
 272         .mkdir = yaffs_mkdir,
 273         .rmdir = yaffs_unlink,
 274         .mknod = yaffs_mknod,
 275         .rename = yaffs_rename,
 276         .setattr = yaffs_setattr,
 277 };
 278
 279 static struct file_operations yaffs_dir_operations = {
 280         .read = generic_read_dir,
 281         .readdir = yaffs_readdir,
 282         .fsync = yaffs_sync_object,
 283 };
 284
 285 static struct super_operations yaffs_super_ops = {
 286         .statfs = yaffs_statfs,
 287         .read_inode = yaffs_read_inode,
 288         .put_inode = yaffs_put_inode,
 289         .put_super = yaffs_put_super,
 290         .delete_inode = yaffs_delete_inode,
 291         .clear_inode = yaffs_clear_inode,
 292         .sync_fs = yaffs_sync_fs,
 293         .write_super = yaffs_write_super,
 294 };
 295
 296 static void yaffs_GrossLock(yaffs_Device * dev)
 297 {
 298         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs locking\n"));
 299
 300         down(&dev->grossLock);
 301 }
 302
 303 static void yaffs_GrossUnlock(yaffs_Device * dev)
 304 {
 305         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs unlocking\n"));
 306         up(&dev->grossLock);
 307
 308 }
 309
 310 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 311                           int buflen)
 312 {
 313         unsigned char *alias;
 314         int ret;
 315
 316         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 317
 318         yaffs_GrossLock(dev);
 319
 320         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 321
 322         yaffs_GrossUnlock(dev);
 323
 324         if (!alias)
 325                 return -ENOMEM;
 326
 327         ret = vfs_readlink(dentry, buffer, buflen, alias);
 328         kfree(alias);
 329         return ret;
 330 }
 331
 332 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 333 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 334 #else
 335 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 336 #endif
 337 {
 338         unsigned char *alias;
 339         int ret;
 340         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 341
 342         yaffs_GrossLock(dev);
 343
 344         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 345
 346         yaffs_GrossUnlock(dev);
 347
 348         if (!alias)
 349         {
 350                 ret = -ENOMEM;
 351                 goto out;
 352         }
 353
 354         ret = vfs_follow_link(nd, alias);
 355         kfree(alias);
 356 out:
 357 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 358         return ERR_PTR (ret);
 359 #else
 360         return ret;
 361 #endif
 362 }
 363
 364 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 365                               yaffs_Object * obj);
 366
 367 /*
 368  * Lookup is used to find objects in the fs
 369  */
 370 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 371
 372 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 373                                    struct nameidata *n)
 374 #else
 375 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 376 #endif
 377 {
 378         yaffs_Object *obj;
 379         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 380
 381         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 382
 383         yaffs_GrossLock(dev);
 384
 385         T(YAFFS_TRACE_OS,
 386           (KERN_DEBUG "yaffs_lookup for %d:%s\n",
 387            yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 388
 389         obj =
 390             yaffs_FindObjectByName(yaffs_InodeToObject(dir),
 391                                    dentry->d_name.name);
 392
 393         obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
 394
 395         /* Can't hold gross lock when calling yaffs_get_inode() */
 396         yaffs_GrossUnlock(dev);
 397
 398         if (obj) {
 399                 T(YAFFS_TRACE_OS,
 400                   (KERN_DEBUG "yaffs_lookup found %d\n", obj->objectId));
 401
 402                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 403
 404                 if (inode) {
 405                         T(YAFFS_TRACE_OS,
 406                           (KERN_DEBUG "yaffs_loookup dentry \n"));
 407 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 408  * d_add even if NULL inode */
 409 #if 0
 410                         /*dget(dentry); // try to solve directory bug */
 411                         d_add(dentry, inode);
 412
 413                         /* return dentry; */
 414                         return NULL;
 415 #endif
 416                 }
 417
 418         } else {
 419                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_lookup not found\n"));
 420
 421         }
 422
 423 /* added NCB for 2.5/6 compatability - forces add even if inode is
 424  * NULL which creates dentry hash */
 425         d_add(dentry, inode);
 426
 427         return NULL;
 428         /*      return (ERR_PTR(-EIO)); */
 429
 430 }
 431
 432 /* For now put inode is just for debugging
 433  * Put inode is called when the inode **structure** is put.
 434  */
 435 static void yaffs_put_inode(struct inode *inode)
 436 {
 437         T(YAFFS_TRACE_OS,
 438           ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 439            atomic_read(&inode->i_count)));
 440
 441 }
 442
 443 /* clear is called to tell the fs to release any per-inode data it holds */
 444 static void yaffs_clear_inode(struct inode *inode)
 445 {
 446         yaffs_Object *obj;
 447         yaffs_Device *dev;
 448
 449         obj = yaffs_InodeToObject(inode);
 450
 451         T(YAFFS_TRACE_OS,
 452           ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 453            atomic_read(&inode->i_count),
 454            obj ? "object exists" : "null object"));
 455
 456         if (obj) {
 457                 dev = obj->myDev;
 458                 yaffs_GrossLock(dev);
 459
 460                 /* Clear the association between the inode and
 461                  * the yaffs_Object.
 462                  */
 463                 obj->myInode = NULL;
 464                 yaffs_InodeToObjectLV(inode) = NULL;
 465
 466                 /* If the object freeing was deferred, then the real
 467                  * free happens now.
 468                  * This should fix the inode inconsistency problem.
 469                  */
 470
 471                 yaffs_HandleDeferedFree(obj);
 472
 473                 yaffs_GrossUnlock(dev);
 474         }
 475
 476 }
 477
 478 /* delete is called when the link count is zero and the inode
 479  * is put (ie. nobody wants to know about it anymore, time to
 480  * delete the file).
 481  * NB Must call clear_inode()
 482  */
 483 static void yaffs_delete_inode(struct inode *inode)
 484 {
 485         yaffs_Object *obj = yaffs_InodeToObject(inode);
 486         yaffs_Device *dev;
 487
 488         T(YAFFS_TRACE_OS,
 489           ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 490            atomic_read(&inode->i_count),
 491            obj ? "object exists" : "null object"));
 492
 493         if (obj) {
 494                 dev = obj->myDev;
 495                 yaffs_GrossLock(dev);
 496                 yaffs_DeleteFile(obj);
 497                 yaffs_GrossUnlock(dev);
 498         }
 499 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 500         truncate_inode_pages (&inode->i_data, 0);
 501 #endif
 502         clear_inode(inode);
 503 }
 504
 505 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 506 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 507 #else
 508 static int yaffs_file_flush(struct file *file)
 509 #endif
 510 {
 511         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 512
 513         yaffs_Device *dev = obj->myDev;
 514
 515         T(YAFFS_TRACE_OS,
 516           (KERN_DEBUG "yaffs_file_flush object %d (%s)\n", obj->objectId,
 517            obj->dirty ? "dirty" : "clean"));
 518
 519         yaffs_GrossLock(dev);
 520
 521         yaffs_FlushFile(obj, 1);
 522
 523         yaffs_GrossUnlock(dev);
 524
 525         return 0;
 526 }
 527
 528 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 529 {
 530         /* Lifted from jffs2 */
 531
 532         yaffs_Object *obj;
 533         unsigned char *pg_buf;
 534         int ret;
 535
 536         yaffs_Device *dev;
 537
 538         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage at %08x, size %08x\n",
 539                            (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 540                            (unsigned)PAGE_CACHE_SIZE));
 541
 542         obj = yaffs_DentryToObject(f->f_dentry);
 543
 544         dev = obj->myDev;
 545
 546 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 547         BUG_ON(!PageLocked(pg));
 548 #else
 549         if (!PageLocked(pg))
 550                 PAGE_BUG(pg);
 551 #endif
 552
 553         pg_buf = kmap(pg);
 554         /* FIXME: Can kmap fail? */
 555
 556         yaffs_GrossLock(dev);
 557
 558         ret =
 559             yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT,
 560                                    PAGE_CACHE_SIZE);
 561
 562         yaffs_GrossUnlock(dev);
 563
 564         if (ret >= 0)
 565                 ret = 0;
 566
 567         if (ret) {
 568                 ClearPageUptodate(pg);
 569                 SetPageError(pg);
 570         } else {
 571                 SetPageUptodate(pg);
 572                 ClearPageError(pg);
 573         }
 574
 575         flush_dcache_page(pg);
 576         kunmap(pg);
 577
 578         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage done\n"));
 579         return ret;
 580 }
 581
 582 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 583 {
 584         int ret = yaffs_readpage_nolock(f, pg);
 585         UnlockPage(pg);
 586         return ret;
 587 }
 588
 589 static int yaffs_readpage(struct file *f, struct page *pg)
 590 {
 591         return yaffs_readpage_unlock(f, pg);
 592 }
 593
 594 /* writepage inspired by/stolen from smbfs */
 595
 596 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 597 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 598 #else
 599 static int yaffs_writepage(struct page *page)
 600 #endif
 601 {
 602         struct address_space *mapping = page->mapping;
 603         loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
 604         struct inode *inode;
 605         unsigned long end_index;
 606         char *buffer;
 607         yaffs_Object *obj;
 608         int nWritten = 0;
 609         unsigned nBytes;
 610
 611         if (!mapping)
 612                 BUG();
 613         inode = mapping->host;
 614         if (!inode)
 615                 BUG();
 616
 617         if (offset > inode->i_size) {
 618                 T(YAFFS_TRACE_OS,
 619                   (KERN_DEBUG
 620                    "yaffs_writepage at %08x, inode size = %08x!!!\n",
 621                    (unsigned)(page->index << PAGE_CACHE_SHIFT),
 622                    (unsigned)inode->i_size));
 623                 T(YAFFS_TRACE_OS,
 624                   (KERN_DEBUG "                -> don't care!!\n"));
 625                 unlock_page(page);
 626                 return 0;
 627         }
 628
 629         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 630
 631         /* easy case */
 632         if (page->index < end_index) {
 633                 nBytes = PAGE_CACHE_SIZE;
 634         } else {
 635                 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
 636         }
 637
 638         get_page(page);
 639
 640         buffer = kmap(page);
 641
 642         obj = yaffs_InodeToObject(inode);
 643         yaffs_GrossLock(obj->myDev);
 644
 645         T(YAFFS_TRACE_OS,
 646           (KERN_DEBUG "yaffs_writepage at %08x, size %08x\n",
 647            (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 648         T(YAFFS_TRACE_OS,
 649           (KERN_DEBUG "writepag0: obj = %05x, ino = %05x\n",
 650            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 651
 652         nWritten =
 653             yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT,
 654                                   nBytes, 0);
 655
 656         T(YAFFS_TRACE_OS,
 657           (KERN_DEBUG "writepag1: obj = %05x, ino = %05x\n",
 658            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 659
 660         yaffs_GrossUnlock(obj->myDev);
 661
 662         kunmap(page);
 663         SetPageUptodate(page);
 664         UnlockPage(page);
 665         put_page(page);
 666
 667         return (nWritten == nBytes) ? 0 : -ENOSPC;
 668 }
 669
 670 static int yaffs_prepare_write(struct file *f, struct page *pg,
 671                                unsigned offset, unsigned to)
 672 {
 673
 674         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
 675         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 676                 return yaffs_readpage_nolock(f, pg);
 677
 678         return 0;
 679
 680 }
 681
 682 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 683                               unsigned to)
 684 {
 685
 686         void *addr = page_address(pg) + offset;
 687         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
 688         int nBytes = to - offset;
 689         int nWritten;
 690
 691         unsigned spos = pos;
 692         unsigned saddr = (unsigned)addr;
 693
 694         T(YAFFS_TRACE_OS,
 695           (KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
 696            spos, nBytes));
 697
 698         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
 699
 700         if (nWritten != nBytes) {
 701                 T(YAFFS_TRACE_OS,
 702                   (KERN_DEBUG
 703                    "yaffs_commit_write not same size nWritten %d  nBytes %d\n",
 704                    nWritten, nBytes));
 705                 SetPageError(pg);
 706                 ClearPageUptodate(pg);
 707         } else {
 708                 SetPageUptodate(pg);
 709         }
 710
 711         T(YAFFS_TRACE_OS,
 712           (KERN_DEBUG "yaffs_commit_write returning %d\n",
 713            nWritten == nBytes ? 0 : nWritten));
 714
 715         return nWritten == nBytes ? 0 : nWritten;
 716
 717 }
 718
 719 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
 720 {
 721         if (inode && obj) {
 722
 723
 724                 /* Check mode against the variant type and attempt to repair if broken. */
 725                 __u32 mode = obj->yst_mode;
 726                 switch( obj->variantType ){
 727                 case YAFFS_OBJECT_TYPE_FILE :
 728                         if( ! S_ISREG(mode) ){
 729                                 obj->yst_mode &= ~S_IFMT;
 730                                 obj->yst_mode |= S_IFREG;
 731                         }
 732
 733                         break;
 734                 case YAFFS_OBJECT_TYPE_SYMLINK :
 735                         if( ! S_ISLNK(mode) ){
 736                                 obj->yst_mode &= ~S_IFMT;
 737                                 obj->yst_mode |= S_IFLNK;
 738                         }
 739
 740                         break;
 741                 case YAFFS_OBJECT_TYPE_DIRECTORY :
 742                         if( ! S_ISDIR(mode) ){
 743                                 obj->yst_mode &= ~S_IFMT;
 744                                 obj->yst_mode |= S_IFDIR;
 745                         }
 746
 747                         break;
 748                 case YAFFS_OBJECT_TYPE_UNKNOWN :
 749                 case YAFFS_OBJECT_TYPE_HARDLINK :
 750                 case YAFFS_OBJECT_TYPE_SPECIAL :
 751                 default:
 752                         /* TODO? */
 753                         break;
 754                 }
 755
 756                 inode->i_ino = obj->objectId;
 757                 inode->i_mode = obj->yst_mode;
 758                 inode->i_uid = obj->yst_uid;
 759                 inode->i_gid = obj->yst_gid;
 760 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
 761                 inode->i_blksize = inode->i_sb->s_blocksize;
 762 #endif
 763 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 764
 765                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 766                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
 767                 inode->i_atime.tv_nsec = 0;
 768                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
 769                 inode->i_mtime.tv_nsec = 0;
 770                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
 771                 inode->i_ctime.tv_nsec = 0;
 772 #else
 773                 inode->i_rdev = obj->yst_rdev;
 774                 inode->i_atime = obj->yst_atime;
 775                 inode->i_mtime = obj->yst_mtime;
 776                 inode->i_ctime = obj->yst_ctime;
 777 #endif
 778                 inode->i_size = yaffs_GetObjectFileLength(obj);
 779                 inode->i_blocks = (inode->i_size + 511) >> 9;
 780
 781                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 782
 783                 T(YAFFS_TRACE_OS,
 784                   (KERN_DEBUG
 785                    "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 786                    inode->i_mode, inode->i_uid, inode->i_gid,
 787                    (int)inode->i_size, atomic_read(&inode->i_count)));
 788
 789                 switch (obj->yst_mode & S_IFMT) {
 790                 default:        /* fifo, device or socket */
 791 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 792                         init_special_inode(inode, obj->yst_mode,
 793                                            old_decode_dev(obj->yst_rdev));
 794 #else
 795                         init_special_inode(inode, obj->yst_mode,
 796                                            (dev_t) (obj->yst_rdev));
 797 #endif
 798                         break;
 799                 case S_IFREG:   /* file */
 800                         inode->i_op = &yaffs_file_inode_operations;
 801                         inode->i_fop = &yaffs_file_operations;
 802                         inode->i_mapping->a_ops =
 803                             &yaffs_file_address_operations;
 804                         break;
 805                 case S_IFDIR:   /* directory */
 806                         inode->i_op = &yaffs_dir_inode_operations;
 807                         inode->i_fop = &yaffs_dir_operations;
 808                         break;
 809                 case S_IFLNK:   /* symlink */
 810                         inode->i_op = &yaffs_symlink_inode_operations;
 811                         break;
 812                 }
 813
 814                 yaffs_InodeToObjectLV(inode) = obj;
 815
 816                 obj->myInode = inode;
 817
 818         } else {
 819                 T(YAFFS_TRACE_OS,
 820                   (KERN_DEBUG "yaffs_FileInode invalid parameters\n"));
 821         }
 822
 823 }
 824
 825 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 826                               yaffs_Object * obj)
 827 {
 828         struct inode *inode;
 829
 830         if (!sb) {
 831                 T(YAFFS_TRACE_OS,
 832                   (KERN_DEBUG "yaffs_get_inode for NULL super_block!!\n"));
 833                 return NULL;
 834
 835         }
 836
 837         if (!obj) {
 838                 T(YAFFS_TRACE_OS,
 839                   (KERN_DEBUG "yaffs_get_inode for NULL object!!\n"));
 840                 return NULL;
 841
 842         }
 843
 844         T(YAFFS_TRACE_OS,
 845           (KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId));
 846
 847         inode = iget(sb, obj->objectId);
 848
 849         /* NB Side effect: iget calls back to yaffs_read_inode(). */
 850         /* iget also increments the inode's i_count */
 851         /* NB You can't be holding grossLock or deadlock will happen! */
 852
 853         return inode;
 854 }
 855
 856 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 857                                 loff_t * pos)
 858 {
 859         yaffs_Object *obj;
 860         int nWritten, ipos;
 861         struct inode *inode;
 862         yaffs_Device *dev;
 863
 864         obj = yaffs_DentryToObject(f->f_dentry);
 865
 866         dev = obj->myDev;
 867
 868         yaffs_GrossLock(dev);
 869
 870         inode = f->f_dentry->d_inode;
 871
 872         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) {
 873                 ipos = inode->i_size;
 874         } else {
 875                 ipos = *pos;
 876         }
 877
 878         if (!obj) {
 879                 T(YAFFS_TRACE_OS,
 880                   (KERN_DEBUG "yaffs_file_write: hey obj is null!\n"));
 881         } else {
 882                 T(YAFFS_TRACE_OS,
 883                   (KERN_DEBUG
 884                    "yaffs_file_write about to write writing %d bytes"
 885                    "to object %d at %d\n",
 886                    n, obj->objectId, ipos));
 887         }
 888
 889         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
 890
 891         T(YAFFS_TRACE_OS,
 892           (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n",
 893            n, nWritten, ipos));
 894         if (nWritten > 0) {
 895                 ipos += nWritten;
 896                 *pos = ipos;
 897                 if (ipos > inode->i_size) {
 898                         inode->i_size = ipos;
 899                         inode->i_blocks = (ipos + 511) >> 9;
 900
 901                         T(YAFFS_TRACE_OS,
 902                           (KERN_DEBUG
 903                            "yaffs_file_write size updated to %d bytes, "
 904                            "%d blocks\n",
 905                            ipos, (int)(inode->i_blocks)));
 906                 }
 907
 908         }
 909         yaffs_GrossUnlock(dev);
 910         return nWritten == 0 ? -ENOSPC : nWritten;
 911 }
 912
 913 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 914 {
 915         yaffs_Object *obj;
 916         yaffs_Device *dev;
 917         struct inode *inode = f->f_dentry->d_inode;
 918         unsigned long offset, curoffs;
 919         struct list_head *i;
 920         yaffs_Object *l;
 921
 922         char name[YAFFS_MAX_NAME_LENGTH + 1];
 923
 924         obj = yaffs_DentryToObject(f->f_dentry);
 925         dev = obj->myDev;
 926
 927         yaffs_GrossLock(dev);
 928
 929         offset = f->f_pos;
 930
 931         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
 932
 933         if (offset == 0) {
 934                 T(YAFFS_TRACE_OS,
 935                   (KERN_DEBUG "yaffs_readdir: entry . ino %d \n",
 936                    (int)inode->i_ino));
 937                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR)
 938                     < 0) {
 939                         goto out;
 940                 }
 941                 offset++;
 942                 f->f_pos++;
 943         }
 944         if (offset == 1) {
 945                 T(YAFFS_TRACE_OS,
 946                   (KERN_DEBUG "yaffs_readdir: entry .. ino %d \n",
 947                    (int)f->f_dentry->d_parent->d_inode->i_ino));
 948                 if (filldir
 949                     (dirent, "..", 2, offset,
 950                      f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 951                         goto out;
 952                 }
 953                 offset++;
 954                 f->f_pos++;
 955         }
 956
 957         curoffs = 1;
 958
 959         /* If the directory has changed since the open or last call to
 960            readdir, rewind to after the 2 canned entries. */
 961
 962         if (f->f_version != inode->i_version) {
 963                 offset = 2;
 964                 f->f_pos = offset;
 965                 f->f_version = inode->i_version;
 966         }
 967
 968         list_for_each(i, &obj->variant.directoryVariant.children) {
 969                 curoffs++;
 970                 if (curoffs >= offset) {
 971                         l = list_entry(i, yaffs_Object, siblings);
 972
 973                         yaffs_GetObjectName(l, name,
 974                                             YAFFS_MAX_NAME_LENGTH + 1);
 975                         T(YAFFS_TRACE_OS,
 976                           (KERN_DEBUG "yaffs_readdir: %s inode %d\n", name,
 977                            yaffs_GetObjectInode(l)));
 978
 979                         if (filldir(dirent,
 980                                     name,
 981                                     strlen(name),
 982                                     offset,
 983                                     yaffs_GetObjectInode(l),
 984                                     yaffs_GetObjectType(l))
 985                             < 0) {
 986                                 goto up_and_out;
 987                         }
 988
 989                         offset++;
 990                         f->f_pos++;
 991                 }
 992         }
 993
 994       up_and_out:
 995       out:
 996
 997         yaffs_GrossUnlock(dev);
 998
 999         return 0;
1000 }
1001
1002 /*
1003  * File creation. Allocate an inode, and we're done..
1004  */
1005 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1006 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1007                        dev_t rdev)
1008 #else
1009 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1010                        int rdev)
1011 #endif
1012 {
1013         struct inode *inode;
1014
1015         yaffs_Object *obj = NULL;
1016         yaffs_Device *dev;
1017
1018         yaffs_Object *parent = yaffs_InodeToObject(dir);
1019
1020         int error = -ENOSPC;
1021         uid_t uid = current->fsuid;
1022         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1023
1024         if((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1025                 mode |= S_ISGID;
1026
1027         if (parent) {
1028                 T(YAFFS_TRACE_OS,
1029                   (KERN_DEBUG "yaffs_mknod: parent object %d type %d\n",
1030                    parent->objectId, parent->variantType));
1031         } else {
1032                 T(YAFFS_TRACE_OS,
1033                   (KERN_DEBUG "yaffs_mknod: could not get parent object\n"));
1034                 return -EPERM;
1035         }
1036
1037         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1038                            "mode %x dev %x\n",
1039                            dentry->d_name.name, mode, rdev));
1040
1041         dev = parent->myDev;
1042
1043         yaffs_GrossLock(dev);
1044
1045         switch (mode & S_IFMT) {
1046         default:
1047                 /* Special (socket, fifo, device...) */
1048                 T(YAFFS_TRACE_OS, (KERN_DEBUG
1049                                    "yaffs_mknod: making special\n"));
1050 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1051                 obj =
1052                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1053                                        gid, old_encode_dev(rdev));
1054 #else
1055                 obj =
1056                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1057                                        gid, rdev);
1058 #endif
1059                 break;
1060         case S_IFREG:           /* file          */
1061                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1062                 obj =
1063                     yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1064                                     gid);
1065                 break;
1066         case S_IFDIR:           /* directory */
1067                 T(YAFFS_TRACE_OS,
1068                   (KERN_DEBUG "yaffs_mknod: making directory\n"));
1069                 obj =
1070                     yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1071                                          uid, gid);
1072                 break;
1073         case S_IFLNK:           /* symlink */
1074                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1075                 obj = NULL;     /* Do we ever get here? */
1076                 break;
1077         }
1078
1079         /* Can not call yaffs_get_inode() with gross lock held */
1080         yaffs_GrossUnlock(dev);
1081
1082         if (obj) {
1083                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1084                 d_instantiate(dentry, inode);
1085                 T(YAFFS_TRACE_OS,
1086                   (KERN_DEBUG "yaffs_mknod created object %d count = %d\n",
1087                    obj->objectId, atomic_read(&inode->i_count)));
1088                 error = 0;
1089         } else {
1090                 T(YAFFS_TRACE_OS,
1091                   (KERN_DEBUG "yaffs_mknod failed making object\n"));
1092                 error = -ENOMEM;
1093         }
1094
1095         return error;
1096 }
1097
1098 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1099 {
1100         int retVal;
1101         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mkdir\n"));
1102         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1103 #if 0
1104         /* attempt to fix dir bug - didn't work */
1105         if (!retVal) {
1106                 dget(dentry);
1107         }
1108 #endif
1109         return retVal;
1110 }
1111
1112 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1113 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1114                         struct nameidata *n)
1115 #else
1116 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1117 #endif
1118 {
1119         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_create\n"));
1120         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1121 }
1122
1123 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1124 {
1125         int retVal;
1126
1127         yaffs_Device *dev;
1128
1129         T(YAFFS_TRACE_OS,
1130           (KERN_DEBUG "yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1131            dentry->d_name.name));
1132
1133         dev = yaffs_InodeToObject(dir)->myDev;
1134
1135         yaffs_GrossLock(dev);
1136
1137         retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1138
1139         if (retVal == YAFFS_OK) {
1140                 dentry->d_inode->i_nlink--;
1141                 dir->i_version++;
1142                 yaffs_GrossUnlock(dev);
1143                 mark_inode_dirty(dentry->d_inode);
1144                 return 0;
1145         }
1146         yaffs_GrossUnlock(dev);
1147         return -ENOTEMPTY;
1148 }
1149
1150 /*
1151  * Create a link...
1152  */
1153 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1154                       struct dentry *dentry)
1155 {
1156         struct inode *inode = old_dentry->d_inode;
1157         yaffs_Object *obj = NULL;
1158         yaffs_Object *link = NULL;
1159         yaffs_Device *dev;
1160
1161         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_link\n"));
1162
1163         obj = yaffs_InodeToObject(inode);
1164         dev = obj->myDev;
1165
1166         yaffs_GrossLock(dev);
1167
1168         if (!S_ISDIR(inode->i_mode))    /* Don't link directories */
1169         {
1170                 link =
1171                     yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1172                                obj);
1173         }
1174
1175         if (link) {
1176                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1177                 d_instantiate(dentry, old_dentry->d_inode);
1178                 atomic_inc(&old_dentry->d_inode->i_count);
1179                 T(YAFFS_TRACE_OS,
1180                   (KERN_DEBUG "yaffs_link link count %d i_count %d\n",
1181                    old_dentry->d_inode->i_nlink,
1182                    atomic_read(&old_dentry->d_inode->i_count)));
1183
1184         }
1185
1186         yaffs_GrossUnlock(dev);
1187
1188         if (link) {
1189
1190                 return 0;
1191         }
1192
1193         return -EPERM;
1194 }
1195
1196 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1197                          const char *symname)
1198 {
1199         yaffs_Object *obj;
1200         yaffs_Device *dev;
1201         uid_t uid = current->fsuid;
1202         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1203
1204         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_symlink\n"));
1205
1206         dev = yaffs_InodeToObject(dir)->myDev;
1207         yaffs_GrossLock(dev);
1208         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1209                                  S_IFLNK | S_IRWXUGO, uid, gid, symname);
1210         yaffs_GrossUnlock(dev);
1211
1212         if (obj) {
1213
1214                 struct inode *inode;
1215
1216                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1217                 d_instantiate(dentry, inode);
1218                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink created OK\n"));
1219                 return 0;
1220         } else {
1221                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink not created\n"));
1222
1223         }
1224
1225         return -ENOMEM;
1226 }
1227
1228 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1229                              int datasync)
1230 {
1231
1232         yaffs_Object *obj;
1233         yaffs_Device *dev;
1234
1235         obj = yaffs_DentryToObject(dentry);
1236
1237         dev = obj->myDev;
1238
1239         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_object\n"));
1240         yaffs_GrossLock(dev);
1241         yaffs_FlushFile(obj, 1);
1242         yaffs_GrossUnlock(dev);
1243         return 0;
1244 }
1245
1246 /*
1247  * The VFS layer already does all the dentry stuff for rename.
1248  *
1249  * NB: POSIX says you can rename an object over an old object of the same name
1250  */
1251 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1252                         struct inode *new_dir, struct dentry *new_dentry)
1253 {
1254         yaffs_Device *dev;
1255         int retVal = YAFFS_FAIL;
1256         yaffs_Object *target;
1257
1258         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_rename\n"));
1259         dev = yaffs_InodeToObject(old_dir)->myDev;
1260
1261         yaffs_GrossLock(dev);
1262
1263         /* Check if the target is an existing directory that is not empty. */
1264         target =
1265             yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1266                                    new_dentry->d_name.name);
1267
1268
1269
1270         if (target &&
1271             target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1272             !list_empty(&target->variant.directoryVariant.children)) {
1273
1274                 T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n"));
1275
1276                 retVal = YAFFS_FAIL;
1277         } else {
1278
1279                 /* Now does unlinking internally using shadowing mechanism */
1280                 T(YAFFS_TRACE_OS, (KERN_DEBUG "calling yaffs_RenameObject\n"));
1281
1282                 retVal =
1283                     yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1284                                        old_dentry->d_name.name,
1285                                        yaffs_InodeToObject(new_dir),
1286                                        new_dentry->d_name.name);
1287
1288         }
1289         yaffs_GrossUnlock(dev);
1290
1291         if (retVal == YAFFS_OK) {
1292                 if(target) {
1293                         new_dentry->d_inode->i_nlink--;
1294                         mark_inode_dirty(new_dentry->d_inode);
1295                 }
1296
1297                 return 0;
1298         } else {
1299                 return -ENOTEMPTY;
1300         }
1301
1302 }
1303
1304 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1305 {
1306         struct inode *inode = dentry->d_inode;
1307         int error;
1308         yaffs_Device *dev;
1309
1310         T(YAFFS_TRACE_OS,
1311           (KERN_DEBUG "yaffs_setattr of object %d\n",
1312            yaffs_InodeToObject(inode)->objectId));
1313
1314         if ((error = inode_change_ok(inode, attr)) == 0) {
1315
1316                 dev = yaffs_InodeToObject(inode)->myDev;
1317                 yaffs_GrossLock(dev);
1318                 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1319                     YAFFS_OK) {
1320                         error = 0;
1321                 } else {
1322                         error = -EPERM;
1323                 }
1324                 yaffs_GrossUnlock(dev);
1325                 if (!error)
1326                         error = inode_setattr(inode, attr);
1327         }
1328         return error;
1329 }
1330
1331 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1332 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1333 {
1334         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1335         struct super_block *sb = dentry->d_sb;
1336 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1337 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1338 {
1339         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1340 #else
1341 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1342 {
1343         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1344 #endif
1345
1346         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_statfs\n"));
1347
1348         yaffs_GrossLock(dev);
1349
1350         buf->f_type = YAFFS_MAGIC;
1351         buf->f_bsize = sb->s_blocksize;
1352         buf->f_namelen = 255;
1353         if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1354
1355                 buf->f_blocks =
1356                     (dev->endBlock - dev->startBlock +
1357                      1) * dev->nChunksPerBlock / (sb->s_blocksize /
1358                                                   dev->nDataBytesPerChunk);
1359                 buf->f_bfree =
1360                     yaffs_GetNumberOfFreeChunks(dev) / (sb->s_blocksize /
1361                                                         dev->nDataBytesPerChunk);
1362         } else {
1363
1364                 buf->f_blocks =
1365                     (dev->endBlock - dev->startBlock +
1366                      1) * dev->nChunksPerBlock * (dev->nDataBytesPerChunk /
1367                                                   sb->s_blocksize);
1368                 buf->f_bfree =
1369                     yaffs_GetNumberOfFreeChunks(dev) * (dev->nDataBytesPerChunk /
1370                                                         sb->s_blocksize);
1371         }
1372         buf->f_files = 0;
1373         buf->f_ffree = 0;
1374         buf->f_bavail = buf->f_bfree;
1375
1376         yaffs_GrossUnlock(dev);
1377         return 0;
1378 }
1379
1380
1381 /**
1382 static int yaffs_do_sync_fs(struct super_block *sb)
1383 {
1384
1385         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1386         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_do_sync_fs\n"));
1387
1388         if(sb->s_dirt) {
1389                 yaffs_GrossLock(dev);
1390
1391                 if(dev)
1392                         yaffs_CheckpointSave(dev);
1393
1394                 yaffs_GrossUnlock(dev);
1395
1396                 sb->s_dirt = 0;
1397         }
1398         return 0;
1399 }
1400 **/
1401
1402 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1403 static void yaffs_write_super(struct super_block *sb)
1404 #else
1405 static int yaffs_write_super(struct super_block *sb)
1406 #endif
1407 {
1408
1409         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n"));
1410 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
1411         return 0; /* yaffs_do_sync_fs(sb);*/
1412 #endif
1413 }
1414
1415
1416 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1417 static int yaffs_sync_fs(struct super_block *sb, int wait)
1418 #else
1419 static int yaffs_sync_fs(struct super_block *sb)
1420 #endif
1421 {
1422
1423         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n"));
1424
1425         return 0; /* yaffs_do_sync_fs(sb);*/
1426
1427 }
1428
1429
1430 static void yaffs_read_inode(struct inode *inode)
1431 {
1432         /* NB This is called as a side effect of other functions, but
1433          * we had to release the lock to prevent deadlocks, so
1434          * need to lock again.
1435          */
1436
1437         yaffs_Object *obj;
1438         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1439
1440         T(YAFFS_TRACE_OS,
1441           (KERN_DEBUG "yaffs_read_inode for %d\n", (int)inode->i_ino));
1442
1443         yaffs_GrossLock(dev);
1444
1445         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1446
1447         yaffs_FillInodeFromObject(inode, obj);
1448
1449         yaffs_GrossUnlock(dev);
1450 }
1451
1452 static LIST_HEAD(yaffs_dev_list);
1453
1454 #if 0 // not used
1455 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1456 {
1457         yaffs_Device    *dev = yaffs_SuperToDevice(sb);
1458
1459         if( *flags & MS_RDONLY ) {
1460                 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1461
1462                 T(YAFFS_TRACE_OS,
1463                         (KERN_DEBUG "yaffs_remount_fs: %s: RO\n", dev->name ));
1464
1465                 yaffs_GrossLock(dev);
1466
1467                 yaffs_FlushEntireDeviceCache(dev);
1468
1469                 yaffs_CheckpointSave(dev);
1470
1471                 if (mtd->sync)
1472                         mtd->sync(mtd);
1473
1474                 yaffs_GrossUnlock(dev);
1475         }
1476         else {
1477                 T(YAFFS_TRACE_OS,
1478                         (KERN_DEBUG "yaffs_remount_fs: %s: RW\n", dev->name ));
1479         }
1480
1481         return 0;
1482 }
1483 #endif
1484
1485 static void yaffs_put_super(struct super_block *sb)
1486 {
1487         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1488
1489         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_put_super\n"));
1490
1491         yaffs_GrossLock(dev);
1492
1493         yaffs_FlushEntireDeviceCache(dev);
1494
1495         yaffs_CheckpointSave(dev);
1496
1497         if (dev->putSuperFunc) {
1498                 dev->putSuperFunc(sb);
1499         }
1500
1501         yaffs_Deinitialise(dev);
1502
1503         yaffs_GrossUnlock(dev);
1504
1505         /* we assume this is protected by lock_kernel() in mount/umount */
1506         list_del(&dev->devList);
1507
1508         if(dev->spareBuffer){
1509                 YFREE(dev->spareBuffer);
1510                 dev->spareBuffer = NULL;
1511         }
1512
1513         kfree(dev);
1514 }
1515
1516
1517 static void yaffs_MTDPutSuper(struct super_block *sb)
1518 {
1519
1520         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1521
1522         if (mtd->sync) {
1523                 mtd->sync(mtd);
1524         }
1525
1526         put_mtd_device(mtd);
1527 }
1528
1529
1530 static void yaffs_MarkSuperBlockDirty(void *vsb)
1531 {
1532         struct super_block *sb = (struct super_block *)vsb;
1533
1534         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_MarkSuperBlockDirty() sb = %p\n",sb));
1535 //      if(sb)
1536 //              sb->s_dirt = 1;
1537 }
1538
1539 typedef struct {
1540         int inband_tags;
1541         int skip_checkpoint_read;
1542         int skip_checkpoint_write;
1543         int no_cache;
1544 } yaffs_options;
1545
1546 #define MAX_OPT_LEN 20
1547 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1548 {
1549         char cur_opt[MAX_OPT_LEN+1];
1550         int p;
1551         int error = 0;
1552
1553         /* Parse through the options which is a comma seperated list */
1554
1555         while(options_str && *options_str && !error){
1556                 memset(cur_opt,0,MAX_OPT_LEN+1);
1557                 p = 0;
1558
1559                 while(*options_str && *options_str != ','){
1560                         if(p < MAX_OPT_LEN){
1561                                 cur_opt[p] = *options_str;
1562                                 p++;
1563                         }
1564                         options_str++;
1565                 }
1566
1567                 if(!strcmp(cur_opt,"inband-tags"))
1568                         options->inband_tags = 1;
1569                 else if(!strcmp(cur_opt,"no-cache"))
1570                         options->no_cache = 1;
1571                 else if(!strcmp(cur_opt,"no-checkpoint-read"))
1572                         options->skip_checkpoint_read = 1;
1573                 else if(!strcmp(cur_opt,"no-checkpoint-write"))
1574                         options->skip_checkpoint_write = 1;
1575                 else if(!strcmp(cur_opt,"no-checkpoint")){
1576                         options->skip_checkpoint_read = 1;
1577                         options->skip_checkpoint_write = 1;
1578                 } else {
1579                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",cur_opt);
1580                         error = 1;
1581                 }
1582
1583         }
1584
1585         return error;
1586 }
1587
1588 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1589                                                      struct super_block *sb,
1590                                                      void *data, int silent)
1591 {
1592         int nBlocks;
1593         struct inode *inode = NULL;
1594         struct dentry *root;
1595         yaffs_Device *dev = 0;
1596         char devname_buf[BDEVNAME_SIZE + 1];
1597         struct mtd_info *mtd;
1598         int err;
1599         char *data_str = (char *)data;
1600
1601         yaffs_options options;
1602
1603         sb->s_magic = YAFFS_MAGIC;
1604         sb->s_op = &yaffs_super_ops;
1605
1606         if (!sb)
1607                 printk(KERN_INFO "yaffs: sb is NULL\n");
1608         else if (!sb->s_dev)
1609                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1610         else if (!yaffs_devname(sb, devname_buf))
1611                 printk(KERN_INFO "yaffs: devname is NULL\n");
1612         else
1613                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1614                        sb->s_dev,
1615                        yaffs_devname(sb, devname_buf));
1616
1617         if(!data_str)
1618                 data_str = "";
1619
1620         printk(KERN_INFO "yaffs: passed flags \"%s\"\n",data_str);
1621
1622         memset(&options,0,sizeof(options));
1623
1624         if(yaffs_parse_options(&options,data_str)){
1625                 /* Option parsing failed */
1626                 return NULL;
1627         }
1628
1629
1630         sb->s_blocksize = PAGE_CACHE_SIZE;
1631         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1632         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1633         T(YAFFS_TRACE_OS,
1634           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1635
1636 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1637         T(YAFFS_TRACE_OS,
1638           ("yaffs: Write verification disabled. All guarantees "
1639            "null and void\n"));
1640 #endif
1641
1642         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1643                                "\"%s\"\n",
1644                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
1645                                yaffs_devname(sb, devname_buf)));
1646
1647         /* Check it's an mtd device..... */
1648         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
1649                 return NULL;    /* This isn't an mtd device */
1650         }
1651         /* Get the device */
1652         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1653         if (!mtd) {
1654                 T(YAFFS_TRACE_ALWAYS,
1655                   ("yaffs: MTD device #%u doesn't appear to exist\n",
1656                    MINOR(sb->s_dev)));
1657                 return NULL;
1658         }
1659         /* Check it's NAND */
1660         if (mtd->type != MTD_NANDFLASH) {
1661                 T(YAFFS_TRACE_ALWAYS,
1662                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1663                 return NULL;
1664         }
1665
1666         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1667         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1668         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1669         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1670         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1671         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1672         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1673         T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1674         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1675         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1676         T(YAFFS_TRACE_OS, (" size %d\n", mtd->size));
1677
1678 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1679
1680         if (yaffsVersion == 1 &&
1681 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1682             mtd->writesize >= 2048) {
1683 #else
1684             mtd->oobblock >= 2048) {
1685 #endif
1686             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n"));
1687             yaffsVersion = 2;
1688         }
1689
1690         /* Added NCB 26/5/2006 for completeness */
1691         if (yaffsVersion == 2 &&
1692 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1693             mtd->writesize == 512) {
1694 #else
1695             mtd->oobblock == 512) {
1696 #endif
1697             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs1\n"));
1698             yaffsVersion = 1;
1699         }
1700
1701 #endif
1702
1703         if (yaffsVersion == 2) {
1704                 /* Check for version 2 style functions */
1705                 if (!mtd->erase ||
1706                     !mtd->block_isbad ||
1707                     !mtd->block_markbad ||
1708                     !mtd->read ||
1709                     !mtd->write ||
1710 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1711                     !mtd->read_oob || !mtd->write_oob) {
1712 #else
1713                     !mtd->write_ecc ||
1714                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1715 #endif
1716                         T(YAFFS_TRACE_ALWAYS,
1717                           ("yaffs: MTD device does not support required "
1718                            "functions\n"));;
1719                         return NULL;
1720                 }
1721
1722 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1723                 if (mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1724 #else
1725                 if (mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1726 #endif
1727                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) {
1728                         T(YAFFS_TRACE_ALWAYS,
1729                           ("yaffs: MTD device does not have the "
1730                            "right page sizes\n"));
1731                         return NULL;
1732                 }
1733         } else {
1734                 /* Check for V1 style functions */
1735                 if (!mtd->erase ||
1736                     !mtd->read ||
1737                     !mtd->write ||
1738 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1739                     !mtd->read_oob || !mtd->write_oob) {
1740 #else
1741                     !mtd->write_ecc ||
1742                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1743 #endif
1744                         T(YAFFS_TRACE_ALWAYS,
1745                           ("yaffs: MTD device does not support required "
1746                            "functions\n"));;
1747                         return NULL;
1748                 }
1749
1750                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
1751                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1752                         T(YAFFS_TRACE_ALWAYS,
1753                           ("yaffs: MTD device does not support have the "
1754                            "right page sizes\n"));
1755                         return NULL;
1756                 }
1757         }
1758
1759         /* OK, so if we got here, we have an MTD that's NAND and looks
1760          * like it has the right capabilities
1761          * Set the yaffs_Device up for mtd
1762          */
1763
1764 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1765         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1766 #else
1767         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1768 #endif
1769         if (!dev) {
1770                 /* Deep shit could not allocate device structure */
1771                 T(YAFFS_TRACE_ALWAYS,
1772                   ("yaffs_read_super: Failed trying to allocate "
1773                    "yaffs_Device. \n"));
1774                 return NULL;
1775         }
1776
1777         memset(dev, 0, sizeof(yaffs_Device));
1778         dev->genericDevice = mtd;
1779         dev->name = mtd->name;
1780
1781         /* Set up the memory size parameters.... */
1782
1783         nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1784         dev->startBlock = 0;
1785         dev->endBlock = nBlocks - 1;
1786         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1787         dev->nDataBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1788         dev->nReservedBlocks = 5;
1789         dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
1790
1791         /* ... and the functions. */
1792         if (yaffsVersion == 2) {
1793                 dev->writeChunkWithTagsToNAND =
1794                     nandmtd2_WriteChunkWithTagsToNAND;
1795                 dev->readChunkWithTagsFromNAND =
1796                     nandmtd2_ReadChunkWithTagsFromNAND;
1797                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1798                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1799                 dev->spareBuffer = YMALLOC(mtd->oobsize);
1800                 dev->isYaffs2 = 1;
1801 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1802                 dev->nDataBytesPerChunk = mtd->writesize;
1803                 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
1804 #else
1805                 dev->nDataBytesPerChunk = mtd->oobblock;
1806                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1807 #endif
1808                 nBlocks = mtd->size / mtd->erasesize;
1809
1810                 dev->nCheckpointReservedBlocks = CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS;
1811                 dev->startBlock = 0;
1812                 dev->endBlock = nBlocks - 1;
1813         } else {
1814 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1815                 /* use the MTD interface in yaffs_mtdif1.c */
1816                 dev->writeChunkWithTagsToNAND =
1817                         nandmtd1_WriteChunkWithTagsToNAND;
1818                 dev->readChunkWithTagsFromNAND =
1819                         nandmtd1_ReadChunkWithTagsFromNAND;
1820                 dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
1821                 dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
1822 #else
1823                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1824                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1825 #endif
1826                 dev->isYaffs2 = 0;
1827         }
1828         /* ... and common functions */
1829         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1830         dev->initialiseNAND = nandmtd_InitialiseNAND;
1831
1832         dev->putSuperFunc = yaffs_MTDPutSuper;
1833
1834         dev->superBlock = (void *)sb;
1835         dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
1836
1837
1838 #ifndef CONFIG_YAFFS_DOES_ECC
1839         dev->useNANDECC = 1;
1840 #endif
1841
1842 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
1843         dev->wideTnodesDisabled = 1;
1844 #endif
1845
1846         dev->skipCheckpointRead = options.skip_checkpoint_read;
1847         dev->skipCheckpointWrite = options.skip_checkpoint_write;
1848
1849         /* we assume this is protected by lock_kernel() in mount/umount */
1850         list_add_tail(&dev->devList, &yaffs_dev_list);
1851
1852         init_MUTEX(&dev->grossLock);
1853
1854         yaffs_GrossLock(dev);
1855
1856         err = yaffs_GutsInitialise(dev);
1857
1858         T(YAFFS_TRACE_OS,
1859           ("yaffs_read_super: guts initialised %s\n",
1860            (err == YAFFS_OK) ? "OK" : "FAILED"));
1861
1862         /* Release lock before yaffs_get_inode() */
1863         yaffs_GrossUnlock(dev);
1864
1865         /* Create root inode */
1866         if (err == YAFFS_OK)
1867                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
1868                                         yaffs_Root(dev));
1869
1870         if (!inode)
1871                 return NULL;
1872
1873         inode->i_op = &yaffs_dir_inode_operations;
1874         inode->i_fop = &yaffs_dir_operations;
1875
1876         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
1877
1878         root = d_alloc_root(inode);
1879
1880         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
1881
1882         if (!root) {
1883                 iput(inode);
1884                 return NULL;
1885         }
1886         sb->s_root = root;
1887
1888         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
1889         return sb;
1890 }
1891
1892
1893 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1894 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
1895                                          int silent)
1896 {
1897         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
1898 }
1899
1900 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1901 static int yaffs_read_super(struct file_system_type *fs,
1902                             int flags, const char *dev_name,
1903                             void *data, struct vfsmount *mnt)
1904 {
1905
1906         return get_sb_bdev(fs, flags, dev_name, data,
1907                            yaffs_internal_read_super_mtd, mnt);
1908 }
1909 #else
1910 static struct super_block *yaffs_read_super(struct file_system_type *fs,
1911                                             int flags, const char *dev_name,
1912                                             void *data)
1913 {
1914
1915         return get_sb_bdev(fs, flags, dev_name, data,
1916                            yaffs_internal_read_super_mtd);
1917 }
1918 #endif
1919
1920 static struct file_system_type yaffs_fs_type = {
1921         .owner = THIS_MODULE,
1922         .name = "yaffs",
1923         .get_sb = yaffs_read_super,
1924         .kill_sb = kill_block_super,
1925         .fs_flags = FS_REQUIRES_DEV,
1926 };
1927 #else
1928 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
1929                                             int silent)
1930 {
1931         return yaffs_internal_read_super(1, sb, data, silent);
1932 }
1933
1934 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
1935                       FS_REQUIRES_DEV);
1936 #endif
1937
1938
1939 #ifdef CONFIG_YAFFS_YAFFS2
1940
1941 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1942 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
1943                                           int silent)
1944 {
1945         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
1946 }
1947
1948 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1949 static int yaffs2_read_super(struct file_system_type *fs,
1950                         int flags, const char *dev_name, void *data,
1951                         struct vfsmount *mnt)
1952 {
1953         return get_sb_bdev(fs, flags, dev_name, data,
1954                         yaffs2_internal_read_super_mtd, mnt);
1955 }
1956 #else
1957 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
1958                                              int flags, const char *dev_name,
1959                                              void *data)
1960 {
1961
1962         return get_sb_bdev(fs, flags, dev_name, data,
1963                            yaffs2_internal_read_super_mtd);
1964 }
1965 #endif
1966
1967 static struct file_system_type yaffs2_fs_type = {
1968         .owner = THIS_MODULE,
1969         .name = "yaffs2",
1970         .get_sb = yaffs2_read_super,
1971         .kill_sb = kill_block_super,
1972         .fs_flags = FS_REQUIRES_DEV,
1973 };
1974 #else
1975 static struct super_block *yaffs2_read_super(struct super_block *sb,
1976                                              void *data, int silent)
1977 {
1978         return yaffs_internal_read_super(2, sb, data, silent);
1979 }
1980
1981 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
1982                       FS_REQUIRES_DEV);
1983 #endif
1984
1985 #endif                          /* CONFIG_YAFFS_YAFFS2 */
1986
1987 static struct proc_dir_entry *my_proc_entry;
1988
1989 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
1990 {
1991         buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
1992         buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
1993         buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
1994         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
1995         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
1996         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
1997         buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
1998         buf += sprintf(buf, "nCheckptResBlocks.. %d\n", dev->nCheckpointReservedBlocks);
1999         buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2000         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2001         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2002         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2003         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2004         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2005         buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
2006         buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
2007         buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
2008         buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
2009         buf +=
2010             sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
2011         buf +=
2012             sprintf(buf, "passiveGCs......... %d\n",
2013                     dev->passiveGarbageCollections);
2014         buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
2015         buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
2016         buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
2017         buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
2018         buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
2019         buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
2020         buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
2021         buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
2022         buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
2023         buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
2024         buf +=
2025             sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
2026         buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
2027         buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
2028
2029         return buf;
2030 }
2031
2032 static int yaffs_proc_read(char *page,
2033                            char **start,
2034                            off_t offset, int count, int *eof, void *data)
2035 {
2036         struct list_head *item;
2037         char *buf = page;
2038         int step = offset;
2039         int n = 0;
2040
2041         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2042          * We use 'offset' (*ppos) to indicate where we are in devList.
2043          * This also assumes the user has posted a read buffer large
2044          * enough to hold the complete output; but that's life in /proc.
2045          */
2046
2047         *(int *)start = 1;
2048
2049         /* Print header first */
2050         if (step == 0) {
2051                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2052                                "\n%s\n%s\n", yaffs_fs_c_version,
2053                                yaffs_guts_c_version);
2054         }
2055
2056         /* hold lock_kernel while traversing yaffs_dev_list */
2057         lock_kernel();
2058
2059         /* Locate and print the Nth entry.  Order N-squared but N is small. */
2060         list_for_each(item, &yaffs_dev_list) {
2061                 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
2062                 if (n < step) {
2063                         n++;
2064                         continue;
2065                 }
2066                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2067                 buf = yaffs_dump_dev(buf, dev);
2068                 break;
2069         }
2070         unlock_kernel();
2071
2072         return buf - page < count ? buf - page : count;
2073 }
2074
2075 /**
2076  * Set the verbosity of the warnings and error messages.
2077  *
2078  * Note that the names can only be a..z or _ with the current code.
2079  */
2080
2081 static struct {
2082         char *mask_name;
2083         unsigned mask_bitfield;
2084 } mask_flags[] = {
2085         {"allocate", YAFFS_TRACE_ALLOCATE},
2086         {"always", YAFFS_TRACE_ALWAYS},
2087         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2088         {"buffers", YAFFS_TRACE_BUFFERS},
2089         {"bug", YAFFS_TRACE_BUG},
2090         {"checkpt", YAFFS_TRACE_CHECKPOINT},
2091         {"deletion", YAFFS_TRACE_DELETION},
2092         {"erase", YAFFS_TRACE_ERASE},
2093         {"error", YAFFS_TRACE_ERROR},
2094         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2095         {"gc", YAFFS_TRACE_GC},
2096         {"mtd", YAFFS_TRACE_MTD},
2097         {"nandaccess", YAFFS_TRACE_NANDACCESS},
2098         {"os", YAFFS_TRACE_OS},
2099         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2100         {"scan", YAFFS_TRACE_SCAN},
2101         {"tracing", YAFFS_TRACE_TRACING},
2102
2103         {"verify", YAFFS_TRACE_VERIFY},
2104         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2105         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2106         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2107
2108         {"write", YAFFS_TRACE_WRITE},
2109         {"all", 0xffffffff},
2110         {"none", 0},
2111         {NULL, 0},
2112 };
2113
2114 #define MAX_MASK_NAME_LENGTH 40
2115 static int yaffs_proc_write(struct file *file, const char *buf,
2116                                          unsigned long count, void *data)
2117 {
2118         unsigned rg = 0, mask_bitfield;
2119         char *end;
2120         char *mask_name;
2121         const char *x;
2122         char substring[MAX_MASK_NAME_LENGTH+1];
2123         int i;
2124         int done = 0;
2125         int add, len = 0;
2126         int pos = 0;
2127
2128         rg = yaffs_traceMask;
2129
2130         while (!done && (pos < count)) {
2131                 done = 1;
2132                 while ((pos < count) && isspace(buf[pos])) {
2133                         pos++;
2134                 }
2135
2136                 switch (buf[pos]) {
2137                 case '+':
2138                 case '-':
2139                 case '=':
2140                         add = buf[pos];
2141                         pos++;
2142                         break;
2143
2144                 default:
2145                         add = ' ';
2146                         break;
2147                 }
2148                 mask_name = NULL;
2149
2150                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2151                 if (end > buf + pos) {
2152                         mask_name = "numeral";
2153                         len = end - (buf + pos);
2154                         pos += len;
2155                         done = 0;
2156                 } else {
2157                         for(x = buf + pos, i = 0;
2158                             (*x == '_' || (*x >='a' && *x <= 'z')) &&
2159                             i <MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2160                             substring[i] = *x;
2161                         substring[i] = '\0';
2162
2163                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2164                                 if(strcmp(substring,mask_flags[i].mask_name) == 0){
2165                                         mask_name = mask_flags[i].mask_name;
2166                                         mask_bitfield = mask_flags[i].mask_bitfield;
2167                                         done = 0;
2168                                         break;
2169                                 }
2170                         }
2171                 }
2172
2173                 if (mask_name != NULL) {
2174                         done = 0;
2175                         switch(add) {
2176                         case '-':
2177                                 rg &= ~mask_bitfield;
2178                                 break;
2179                         case '+':
2180                                 rg |= mask_bitfield;
2181                                 break;
2182                         case '=':
2183                                 rg = mask_bitfield;
2184                                 break;
2185                         default:
2186                                 rg |= mask_bitfield;
2187                                 break;
2188                         }
2189                 }
2190         }
2191
2192         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2193
2194         printk("new trace = 0x%08X\n",yaffs_traceMask);
2195
2196         if (rg & YAFFS_TRACE_ALWAYS) {
2197                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2198                         char flag;
2199                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2200                         printk("%c%s\n", flag, mask_flags[i].mask_name);
2201                 }
2202         }
2203
2204         return count;
2205 }
2206
2207 /* Stuff to handle installation of file systems */
2208 struct file_system_to_install {
2209         struct file_system_type *fst;
2210         int installed;
2211 };
2212
2213 static struct file_system_to_install fs_to_install[] = {
2214 //#ifdef CONFIG_YAFFS_YAFFS1
2215         {&yaffs_fs_type, 0},
2216 //#endif
2217 //#ifdef CONFIG_YAFFS_YAFFS2
2218         {&yaffs2_fs_type, 0},
2219 //#endif
2220         {NULL, 0}
2221 };
2222
2223 static int __init init_yaffs_fs(void)
2224 {
2225         int error = 0;
2226         struct file_system_to_install *fsinst;
2227
2228         T(YAFFS_TRACE_ALWAYS,
2229           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2230
2231         /* Install the proc_fs entry */
2232         my_proc_entry = create_proc_entry("yaffs",
2233                                                S_IRUGO | S_IFREG,
2234                                                &proc_root);
2235
2236         if (my_proc_entry) {
2237                 my_proc_entry->write_proc = yaffs_proc_write;
2238                 my_proc_entry->read_proc = yaffs_proc_read;
2239                 my_proc_entry->data = NULL;
2240         } else {
2241                 return -ENOMEM;
2242         }
2243
2244         /* Now add the file system entries */
2245
2246         fsinst = fs_to_install;
2247
2248         while (fsinst->fst && !error) {
2249                 error = register_filesystem(fsinst->fst);
2250                 if (!error) {
2251                         fsinst->installed = 1;
2252                 }
2253                 fsinst++;
2254         }
2255
2256         /* Any errors? uninstall  */
2257         if (error) {
2258                 fsinst = fs_to_install;
2259
2260                 while (fsinst->fst) {
2261                         if (fsinst->installed) {
2262                                 unregister_filesystem(fsinst->fst);
2263                                 fsinst->installed = 0;
2264                         }
2265                         fsinst++;
2266                 }
2267         }
2268
2269         return error;
2270 }
2271
2272 static void __exit exit_yaffs_fs(void)
2273 {
2274
2275         struct file_system_to_install *fsinst;
2276
2277         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2278                                " removing. \n"));
2279
2280         remove_proc_entry("yaffs", &proc_root);
2281
2282         fsinst = fs_to_install;
2283
2284         while (fsinst->fst) {
2285                 if (fsinst->installed) {
2286                         unregister_filesystem(fsinst->fst);
2287                         fsinst->installed = 0;
2288                 }
2289                 fsinst++;
2290         }
2291
2292 }
2293
2294 module_init(init_yaffs_fs)
2295 module_exit(exit_yaffs_fs)
2296
2297 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2298 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2299 MODULE_LICENSE("GPL");