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 1.66 2008-05-05 07:58:58 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/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 #include "asm/div64.h"
  57
  58 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
  59
  60 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  61 #include <asm/statfs.h>
  62 #define UnlockPage(p) unlock_page(p)
  63 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  64
  65 /* FIXME: use sb->s_id instead ? */
  66 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)
  67
  68 #else
  69
  70 #include <linux/locks.h>
  71 #define BDEVNAME_SIZE           0
  72 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
  73
  74 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  75 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
  76 #define __user
  77 #endif
  78
  79 #endif
  80
  81 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
  82 #define WRITE_SIZE_STR "writesize"
  83 #define WRITE_SIZE(mtd) (mtd)->writesize
  84 #else
  85 #define WRITE_SIZE_STR "oobblock"
  86 #define WRITE_SIZE(mtd) (mtd)->oobblock
  87 #endif
  88
  89 #include <asm/uaccess.h>
  90
  91 #include "yportenv.h"
  92 #include "yaffs_guts.h"
  93
  94 #include <linux/mtd/mtd.h>
  95 #include "yaffs_mtdif.h"
  96 #include "yaffs_mtdif1.h"
  97 #include "yaffs_mtdif2.h"
  98
  99 unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
 100 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
 101
 102 /* Module Parameters */
 103 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 104 module_param(yaffs_traceMask,uint,0644);
 105 module_param(yaffs_wr_attempts,uint,0644);
 106 #else
 107 MODULE_PARM(yaffs_traceMask,"i");
 108 MODULE_PARM(yaffs_wr_attempts,"i");
 109 #endif
 110
 111 /*#define T(x) printk x */
 112
 113 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 114 #define yaffs_InodeToObjectLV(iptr) (iptr)->i_private
 115 #else
 116 #define yaffs_InodeToObjectLV(iptr) (iptr)->u.generic_ip
 117 #endif
 118
 119 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
 120 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
 121
 122 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 123 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
 124 #else
 125 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 126 #endif
 127
 128 static void yaffs_put_super(struct super_block *sb);
 129
 130 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 131                                 loff_t * pos);
 132
 133 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 134 static int yaffs_file_flush(struct file *file, fl_owner_t id);
 135 #else
 136 static int yaffs_file_flush(struct file *file);
 137 #endif
 138
 139 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 140                              int datasync);
 141
 142 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 143
 144 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 145 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 146                         struct nameidata *n);
 147 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 148                                    struct nameidata *n);
 149 #else
 150 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 151 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 152 #endif
 153 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 154                       struct dentry *dentry);
 155 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 156 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 157                          const char *symname);
 158 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 159
 160 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 161 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 162                        dev_t dev);
 163 #else
 164 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 165                        int dev);
 166 #endif
 167 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 168                         struct inode *new_dir, struct dentry *new_dentry);
 169 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 170
 171 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 172 static int yaffs_sync_fs(struct super_block *sb, int wait);
 173 static void yaffs_write_super(struct super_block *sb);
 174 #else
 175 static int yaffs_sync_fs(struct super_block *sb);
 176 static int yaffs_write_super(struct super_block *sb);
 177 #endif
 178
 179 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 180 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
 181 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 182 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 183 #else
 184 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 185 #endif
 186 static void yaffs_read_inode(struct inode *inode);
 187
 188 static void yaffs_put_inode(struct inode *inode);
 189 static void yaffs_delete_inode(struct inode *);
 190 static void yaffs_clear_inode(struct inode *);
 191
 192 static int yaffs_readpage(struct file *file, struct page *page);
 193 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 194 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 195 #else
 196 static int yaffs_writepage(struct page *page);
 197 #endif
 198 static int yaffs_prepare_write(struct file *f, struct page *pg,
 199                                unsigned offset, unsigned to);
 200 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 201                               unsigned to);
 202
 203 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 204                           int buflen);
 205 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 206 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 207 #else
 208 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 209 #endif
 210
 211 static struct address_space_operations yaffs_file_address_operations = {
 212         .readpage = yaffs_readpage,
 213         .writepage = yaffs_writepage,
 214         .prepare_write = yaffs_prepare_write,
 215         .commit_write = yaffs_commit_write,
 216 };
 217
 218 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,22))
 219 static struct file_operations yaffs_file_operations = {
 220         .read = do_sync_read,
 221         .write = do_sync_write,
 222         .aio_read = generic_file_aio_read,
 223         .aio_write = generic_file_aio_write,
 224         .mmap = generic_file_mmap,
 225         .flush = yaffs_file_flush,
 226         .fsync = yaffs_sync_object,
 227         .splice_read = generic_file_splice_read,
 228         .splice_write = generic_file_splice_write,
 229 };
 230
 231 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
 232
 233 static struct file_operations yaffs_file_operations = {
 234         .read = do_sync_read,
 235         .write = do_sync_write,
 236         .aio_read = generic_file_aio_read,
 237         .aio_write = generic_file_aio_write,
 238         .mmap = generic_file_mmap,
 239         .flush = yaffs_file_flush,
 240         .fsync = yaffs_sync_object,
 241         .sendfile = generic_file_sendfile,
 242 };
 243
 244 #else
 245
 246 static struct file_operations yaffs_file_operations = {
 247         .read = generic_file_read,
 248         .write = generic_file_write,
 249         .mmap = generic_file_mmap,
 250         .flush = yaffs_file_flush,
 251         .fsync = yaffs_sync_object,
 252 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 253         .sendfile = generic_file_sendfile,
 254 #endif
 255 };
 256 #endif
 257
 258 static struct inode_operations yaffs_file_inode_operations = {
 259         .setattr = yaffs_setattr,
 260 };
 261
 262 static struct inode_operations yaffs_symlink_inode_operations = {
 263         .readlink = yaffs_readlink,
 264         .follow_link = yaffs_follow_link,
 265         .setattr = yaffs_setattr,
 266 };
 267
 268 static struct inode_operations yaffs_dir_inode_operations = {
 269         .create = yaffs_create,
 270         .lookup = yaffs_lookup,
 271         .link = yaffs_link,
 272         .unlink = yaffs_unlink,
 273         .symlink = yaffs_symlink,
 274         .mkdir = yaffs_mkdir,
 275         .rmdir = yaffs_unlink,
 276         .mknod = yaffs_mknod,
 277         .rename = yaffs_rename,
 278         .setattr = yaffs_setattr,
 279 };
 280
 281 static struct file_operations yaffs_dir_operations = {
 282         .read = generic_read_dir,
 283         .readdir = yaffs_readdir,
 284         .fsync = yaffs_sync_object,
 285 };
 286
 287 static struct super_operations yaffs_super_ops = {
 288         .statfs = yaffs_statfs,
 289         .read_inode = yaffs_read_inode,
 290         .put_inode = yaffs_put_inode,
 291         .put_super = yaffs_put_super,
 292         .delete_inode = yaffs_delete_inode,
 293         .clear_inode = yaffs_clear_inode,
 294         .sync_fs = yaffs_sync_fs,
 295         .write_super = yaffs_write_super,
 296 };
 297
 298 static void yaffs_GrossLock(yaffs_Device * dev)
 299 {
 300         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs locking\n"));
 301
 302         down(&dev->grossLock);
 303 }
 304
 305 static void yaffs_GrossUnlock(yaffs_Device * dev)
 306 {
 307         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs unlocking\n"));
 308         up(&dev->grossLock);
 309
 310 }
 311
 312 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 313                           int buflen)
 314 {
 315         unsigned char *alias;
 316         int ret;
 317
 318         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 319
 320         yaffs_GrossLock(dev);
 321
 322         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 323
 324         yaffs_GrossUnlock(dev);
 325
 326         if (!alias)
 327                 return -ENOMEM;
 328
 329         ret = vfs_readlink(dentry, buffer, buflen, alias);
 330         kfree(alias);
 331         return ret;
 332 }
 333
 334 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 335 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 336 #else
 337 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 338 #endif
 339 {
 340         unsigned char *alias;
 341         int ret;
 342         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 343
 344         yaffs_GrossLock(dev);
 345
 346         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 347
 348         yaffs_GrossUnlock(dev);
 349
 350         if (!alias)
 351         {
 352                 ret = -ENOMEM;
 353                 goto out;
 354         }
 355
 356         ret = vfs_follow_link(nd, alias);
 357         kfree(alias);
 358 out:
 359 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 360         return ERR_PTR (ret);
 361 #else
 362         return ret;
 363 #endif
 364 }
 365
 366 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 367                               yaffs_Object * obj);
 368
 369 /*
 370  * Lookup is used to find objects in the fs
 371  */
 372 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 373
 374 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 375                                    struct nameidata *n)
 376 #else
 377 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 378 #endif
 379 {
 380         yaffs_Object *obj;
 381         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 382
 383         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 384
 385         yaffs_GrossLock(dev);
 386
 387         T(YAFFS_TRACE_OS,
 388           (KERN_DEBUG "yaffs_lookup for %d:%s\n",
 389            yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 390
 391         obj =
 392             yaffs_FindObjectByName(yaffs_InodeToObject(dir),
 393                                    dentry->d_name.name);
 394
 395         obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
 396
 397         /* Can't hold gross lock when calling yaffs_get_inode() */
 398         yaffs_GrossUnlock(dev);
 399
 400         if (obj) {
 401                 T(YAFFS_TRACE_OS,
 402                   (KERN_DEBUG "yaffs_lookup found %d\n", obj->objectId));
 403
 404                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 405
 406                 if (inode) {
 407                         T(YAFFS_TRACE_OS,
 408                           (KERN_DEBUG "yaffs_loookup dentry \n"));
 409 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 410  * d_add even if NULL inode */
 411 #if 0
 412                         /*dget(dentry); // try to solve directory bug */
 413                         d_add(dentry, inode);
 414
 415                         /* return dentry; */
 416                         return NULL;
 417 #endif
 418                 }
 419
 420         } else {
 421                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_lookup not found\n"));
 422
 423         }
 424
 425 /* added NCB for 2.5/6 compatability - forces add even if inode is
 426  * NULL which creates dentry hash */
 427         d_add(dentry, inode);
 428
 429         return NULL;
 430         /*      return (ERR_PTR(-EIO)); */
 431
 432 }
 433
 434 /* For now put inode is just for debugging
 435  * Put inode is called when the inode **structure** is put.
 436  */
 437 static void yaffs_put_inode(struct inode *inode)
 438 {
 439         T(YAFFS_TRACE_OS,
 440           ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 441            atomic_read(&inode->i_count)));
 442
 443 }
 444
 445 /* clear is called to tell the fs to release any per-inode data it holds */
 446 static void yaffs_clear_inode(struct inode *inode)
 447 {
 448         yaffs_Object *obj;
 449         yaffs_Device *dev;
 450
 451         obj = yaffs_InodeToObject(inode);
 452
 453         T(YAFFS_TRACE_OS,
 454           ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 455            atomic_read(&inode->i_count),
 456            obj ? "object exists" : "null object"));
 457
 458         if (obj) {
 459                 dev = obj->myDev;
 460                 yaffs_GrossLock(dev);
 461
 462                 /* Clear the association between the inode and
 463                  * the yaffs_Object.
 464                  */
 465                 obj->myInode = NULL;
 466                 yaffs_InodeToObjectLV(inode) = NULL;
 467
 468                 /* If the object freeing was deferred, then the real
 469                  * free happens now.
 470                  * This should fix the inode inconsistency problem.
 471                  */
 472
 473                 yaffs_HandleDeferedFree(obj);
 474
 475                 yaffs_GrossUnlock(dev);
 476         }
 477
 478 }
 479
 480 /* delete is called when the link count is zero and the inode
 481  * is put (ie. nobody wants to know about it anymore, time to
 482  * delete the file).
 483  * NB Must call clear_inode()
 484  */
 485 static void yaffs_delete_inode(struct inode *inode)
 486 {
 487         yaffs_Object *obj = yaffs_InodeToObject(inode);
 488         yaffs_Device *dev;
 489
 490         T(YAFFS_TRACE_OS,
 491           ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 492            atomic_read(&inode->i_count),
 493            obj ? "object exists" : "null object"));
 494
 495         if (obj) {
 496                 dev = obj->myDev;
 497                 yaffs_GrossLock(dev);
 498                 yaffs_DeleteFile(obj);
 499                 yaffs_GrossUnlock(dev);
 500         }
 501 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
 502         truncate_inode_pages (&inode->i_data, 0);
 503 #endif
 504         clear_inode(inode);
 505 }
 506
 507 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
 508 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 509 #else
 510 static int yaffs_file_flush(struct file *file)
 511 #endif
 512 {
 513         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 514
 515         yaffs_Device *dev = obj->myDev;
 516
 517         T(YAFFS_TRACE_OS,
 518           (KERN_DEBUG "yaffs_file_flush object %d (%s)\n", obj->objectId,
 519            obj->dirty ? "dirty" : "clean"));
 520
 521         yaffs_GrossLock(dev);
 522
 523         yaffs_FlushFile(obj, 1);
 524
 525         yaffs_GrossUnlock(dev);
 526
 527         return 0;
 528 }
 529
 530 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 531 {
 532         /* Lifted from jffs2 */
 533
 534         yaffs_Object *obj;
 535         unsigned char *pg_buf;
 536         int ret;
 537
 538         yaffs_Device *dev;
 539
 540         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage at %08x, size %08x\n",
 541                            (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 542                            (unsigned)PAGE_CACHE_SIZE));
 543
 544         obj = yaffs_DentryToObject(f->f_dentry);
 545
 546         dev = obj->myDev;
 547
 548 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 549         BUG_ON(!PageLocked(pg));
 550 #else
 551         if (!PageLocked(pg))
 552                 PAGE_BUG(pg);
 553 #endif
 554
 555         pg_buf = kmap(pg);
 556         /* FIXME: Can kmap fail? */
 557
 558         yaffs_GrossLock(dev);
 559
 560         ret =
 561             yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT,
 562                                    PAGE_CACHE_SIZE);
 563
 564         yaffs_GrossUnlock(dev);
 565
 566         if (ret >= 0)
 567                 ret = 0;
 568
 569         if (ret) {
 570                 ClearPageUptodate(pg);
 571                 SetPageError(pg);
 572         } else {
 573                 SetPageUptodate(pg);
 574                 ClearPageError(pg);
 575         }
 576
 577         flush_dcache_page(pg);
 578         kunmap(pg);
 579
 580         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage done\n"));
 581         return ret;
 582 }
 583
 584 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 585 {
 586         int ret = yaffs_readpage_nolock(f, pg);
 587         UnlockPage(pg);
 588         return ret;
 589 }
 590
 591 static int yaffs_readpage(struct file *f, struct page *pg)
 592 {
 593         return yaffs_readpage_unlock(f, pg);
 594 }
 595
 596 /* writepage inspired by/stolen from smbfs */
 597
 598 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 599 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 600 #else
 601 static int yaffs_writepage(struct page *page)
 602 #endif
 603 {
 604         struct address_space *mapping = page->mapping;
 605         loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
 606         struct inode *inode;
 607         unsigned long end_index;
 608         char *buffer;
 609         yaffs_Object *obj;
 610         int nWritten = 0;
 611         unsigned nBytes;
 612
 613         if (!mapping)
 614                 BUG();
 615         inode = mapping->host;
 616         if (!inode)
 617                 BUG();
 618
 619         if (offset > inode->i_size) {
 620                 T(YAFFS_TRACE_OS,
 621                   (KERN_DEBUG
 622                    "yaffs_writepage at %08x, inode size = %08x!!!\n",
 623                    (unsigned)(page->index << PAGE_CACHE_SHIFT),
 624                    (unsigned)inode->i_size));
 625                 T(YAFFS_TRACE_OS,
 626                   (KERN_DEBUG "                -> don't care!!\n"));
 627                 unlock_page(page);
 628                 return 0;
 629         }
 630
 631         end_index = inode->i_size >> PAGE_CACHE_SHIFT;
 632
 633         /* easy case */
 634         if (page->index < end_index) {
 635                 nBytes = PAGE_CACHE_SIZE;
 636         } else {
 637                 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
 638         }
 639
 640         get_page(page);
 641
 642         buffer = kmap(page);
 643
 644         obj = yaffs_InodeToObject(inode);
 645         yaffs_GrossLock(obj->myDev);
 646
 647         T(YAFFS_TRACE_OS,
 648           (KERN_DEBUG "yaffs_writepage at %08x, size %08x\n",
 649            (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 650         T(YAFFS_TRACE_OS,
 651           (KERN_DEBUG "writepag0: obj = %05x, ino = %05x\n",
 652            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 653
 654         nWritten =
 655             yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT,
 656                                   nBytes, 0);
 657
 658         T(YAFFS_TRACE_OS,
 659           (KERN_DEBUG "writepag1: obj = %05x, ino = %05x\n",
 660            (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 661
 662         yaffs_GrossUnlock(obj->myDev);
 663
 664         kunmap(page);
 665         SetPageUptodate(page);
 666         UnlockPage(page);
 667         put_page(page);
 668
 669         return (nWritten == nBytes) ? 0 : -ENOSPC;
 670 }
 671
 672 static int yaffs_prepare_write(struct file *f, struct page *pg,
 673                                unsigned offset, unsigned to)
 674 {
 675
 676         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
 677         if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
 678                 return yaffs_readpage_nolock(f, pg);
 679
 680         return 0;
 681
 682 }
 683
 684 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 685                               unsigned to)
 686 {
 687
 688         void *addr = page_address(pg) + offset;
 689         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
 690         int nBytes = to - offset;
 691         int nWritten;
 692
 693         unsigned spos = pos;
 694         unsigned saddr = (unsigned)addr;
 695
 696         T(YAFFS_TRACE_OS,
 697           (KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
 698            spos, nBytes));
 699
 700         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
 701
 702         if (nWritten != nBytes) {
 703                 T(YAFFS_TRACE_OS,
 704                   (KERN_DEBUG
 705                    "yaffs_commit_write not same size nWritten %d  nBytes %d\n",
 706                    nWritten, nBytes));
 707                 SetPageError(pg);
 708                 ClearPageUptodate(pg);
 709         } else {
 710                 SetPageUptodate(pg);
 711         }
 712
 713         T(YAFFS_TRACE_OS,
 714           (KERN_DEBUG "yaffs_commit_write returning %d\n",
 715            nWritten == nBytes ? 0 : nWritten));
 716
 717         return nWritten == nBytes ? 0 : nWritten;
 718
 719 }
 720
 721 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
 722 {
 723         if (inode && obj) {
 724
 725
 726                 /* Check mode against the variant type and attempt to repair if broken. */
 727                 __u32 mode = obj->yst_mode;
 728                 switch( obj->variantType ){
 729                 case YAFFS_OBJECT_TYPE_FILE :
 730                         if( ! S_ISREG(mode) ){
 731                                 obj->yst_mode &= ~S_IFMT;
 732                                 obj->yst_mode |= S_IFREG;
 733                         }
 734
 735                         break;
 736                 case YAFFS_OBJECT_TYPE_SYMLINK :
 737                         if( ! S_ISLNK(mode) ){
 738                                 obj->yst_mode &= ~S_IFMT;
 739                                 obj->yst_mode |= S_IFLNK;
 740                         }
 741
 742                         break;
 743                 case YAFFS_OBJECT_TYPE_DIRECTORY :
 744                         if( ! S_ISDIR(mode) ){
 745                                 obj->yst_mode &= ~S_IFMT;
 746                                 obj->yst_mode |= S_IFDIR;
 747                         }
 748
 749                         break;
 750                 case YAFFS_OBJECT_TYPE_UNKNOWN :
 751                 case YAFFS_OBJECT_TYPE_HARDLINK :
 752                 case YAFFS_OBJECT_TYPE_SPECIAL :
 753                 default:
 754                         /* TODO? */
 755                         break;
 756                 }
 757
 758                 inode->i_flags |= S_NOATIME;
 759
 760                 inode->i_ino = obj->objectId;
 761                 inode->i_mode = obj->yst_mode;
 762                 inode->i_uid = obj->yst_uid;
 763                 inode->i_gid = obj->yst_gid;
 764 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
 765                 inode->i_blksize = inode->i_sb->s_blocksize;
 766 #endif
 767 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 768
 769                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
 770                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
 771                 inode->i_atime.tv_nsec = 0;
 772                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
 773                 inode->i_mtime.tv_nsec = 0;
 774                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
 775                 inode->i_ctime.tv_nsec = 0;
 776 #else
 777                 inode->i_rdev = obj->yst_rdev;
 778                 inode->i_atime = obj->yst_atime;
 779                 inode->i_mtime = obj->yst_mtime;
 780                 inode->i_ctime = obj->yst_ctime;
 781 #endif
 782                 inode->i_size = yaffs_GetObjectFileLength(obj);
 783                 inode->i_blocks = (inode->i_size + 511) >> 9;
 784
 785                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 786
 787                 T(YAFFS_TRACE_OS,
 788                   (KERN_DEBUG
 789                    "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
 790                    inode->i_mode, inode->i_uid, inode->i_gid,
 791                    (int)inode->i_size, atomic_read(&inode->i_count)));
 792
 793                 switch (obj->yst_mode & S_IFMT) {
 794                 default:        /* fifo, device or socket */
 795 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 796                         init_special_inode(inode, obj->yst_mode,
 797                                            old_decode_dev(obj->yst_rdev));
 798 #else
 799                         init_special_inode(inode, obj->yst_mode,
 800                                            (dev_t) (obj->yst_rdev));
 801 #endif
 802                         break;
 803                 case S_IFREG:   /* file */
 804                         inode->i_op = &yaffs_file_inode_operations;
 805                         inode->i_fop = &yaffs_file_operations;
 806                         inode->i_mapping->a_ops =
 807                             &yaffs_file_address_operations;
 808                         break;
 809                 case S_IFDIR:   /* directory */
 810                         inode->i_op = &yaffs_dir_inode_operations;
 811                         inode->i_fop = &yaffs_dir_operations;
 812                         break;
 813                 case S_IFLNK:   /* symlink */
 814                         inode->i_op = &yaffs_symlink_inode_operations;
 815                         break;
 816                 }
 817
 818                 yaffs_InodeToObjectLV(inode) = obj;
 819
 820                 obj->myInode = inode;
 821
 822         } else {
 823                 T(YAFFS_TRACE_OS,
 824                   (KERN_DEBUG "yaffs_FileInode invalid parameters\n"));
 825         }
 826
 827 }
 828
 829 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 830                               yaffs_Object * obj)
 831 {
 832         struct inode *inode;
 833
 834         if (!sb) {
 835                 T(YAFFS_TRACE_OS,
 836                   (KERN_DEBUG "yaffs_get_inode for NULL super_block!!\n"));
 837                 return NULL;
 838
 839         }
 840
 841         if (!obj) {
 842                 T(YAFFS_TRACE_OS,
 843                   (KERN_DEBUG "yaffs_get_inode for NULL object!!\n"));
 844                 return NULL;
 845
 846         }
 847
 848         T(YAFFS_TRACE_OS,
 849           (KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId));
 850
 851         inode = iget(sb, obj->objectId);
 852
 853         /* NB Side effect: iget calls back to yaffs_read_inode(). */
 854         /* iget also increments the inode's i_count */
 855         /* NB You can't be holding grossLock or deadlock will happen! */
 856
 857         return inode;
 858 }
 859
 860 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 861                                 loff_t * pos)
 862 {
 863         yaffs_Object *obj;
 864         int nWritten, ipos;
 865         struct inode *inode;
 866         yaffs_Device *dev;
 867
 868         obj = yaffs_DentryToObject(f->f_dentry);
 869
 870         dev = obj->myDev;
 871
 872         yaffs_GrossLock(dev);
 873
 874         inode = f->f_dentry->d_inode;
 875
 876         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) {
 877                 ipos = inode->i_size;
 878         } else {
 879                 ipos = *pos;
 880         }
 881
 882         if (!obj) {
 883                 T(YAFFS_TRACE_OS,
 884                   (KERN_DEBUG "yaffs_file_write: hey obj is null!\n"));
 885         } else {
 886                 T(YAFFS_TRACE_OS,
 887                   (KERN_DEBUG
 888                    "yaffs_file_write about to write writing %d bytes"
 889                    "to object %d at %d\n",
 890                    n, obj->objectId, ipos));
 891         }
 892
 893         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
 894
 895         T(YAFFS_TRACE_OS,
 896           (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n",
 897            n, nWritten, ipos));
 898         if (nWritten > 0) {
 899                 ipos += nWritten;
 900                 *pos = ipos;
 901                 if (ipos > inode->i_size) {
 902                         inode->i_size = ipos;
 903                         inode->i_blocks = (ipos + 511) >> 9;
 904
 905                         T(YAFFS_TRACE_OS,
 906                           (KERN_DEBUG
 907                            "yaffs_file_write size updated to %d bytes, "
 908                            "%d blocks\n",
 909                            ipos, (int)(inode->i_blocks)));
 910                 }
 911
 912         }
 913         yaffs_GrossUnlock(dev);
 914         return nWritten == 0 ? -ENOSPC : nWritten;
 915 }
 916
 917 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 918 {
 919         yaffs_Object *obj;
 920         yaffs_Device *dev;
 921         struct inode *inode = f->f_dentry->d_inode;
 922         unsigned long offset, curoffs;
 923         struct list_head *i;
 924         yaffs_Object *l;
 925
 926         char name[YAFFS_MAX_NAME_LENGTH + 1];
 927
 928         obj = yaffs_DentryToObject(f->f_dentry);
 929         dev = obj->myDev;
 930
 931         yaffs_GrossLock(dev);
 932
 933         offset = f->f_pos;
 934
 935         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
 936
 937         if (offset == 0) {
 938                 T(YAFFS_TRACE_OS,
 939                   (KERN_DEBUG "yaffs_readdir: entry . ino %d \n",
 940                    (int)inode->i_ino));
 941                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR)
 942                     < 0) {
 943                         goto out;
 944                 }
 945                 offset++;
 946                 f->f_pos++;
 947         }
 948         if (offset == 1) {
 949                 T(YAFFS_TRACE_OS,
 950                   (KERN_DEBUG "yaffs_readdir: entry .. ino %d \n",
 951                    (int)f->f_dentry->d_parent->d_inode->i_ino));
 952                 if (filldir
 953                     (dirent, "..", 2, offset,
 954                      f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 955                         goto out;
 956                 }
 957                 offset++;
 958                 f->f_pos++;
 959         }
 960
 961         curoffs = 1;
 962
 963         /* If the directory has changed since the open or last call to
 964            readdir, rewind to after the 2 canned entries. */
 965
 966         if (f->f_version != inode->i_version) {
 967                 offset = 2;
 968                 f->f_pos = offset;
 969                 f->f_version = inode->i_version;
 970         }
 971
 972         list_for_each(i, &obj->variant.directoryVariant.children) {
 973                 curoffs++;
 974                 if (curoffs >= offset) {
 975                         l = list_entry(i, yaffs_Object, siblings);
 976
 977                         yaffs_GetObjectName(l, name,
 978                                             YAFFS_MAX_NAME_LENGTH + 1);
 979                         T(YAFFS_TRACE_OS,
 980                           (KERN_DEBUG "yaffs_readdir: %s inode %d\n", name,
 981                            yaffs_GetObjectInode(l)));
 982
 983                         if (filldir(dirent,
 984                                     name,
 985                                     strlen(name),
 986                                     offset,
 987                                     yaffs_GetObjectInode(l),
 988                                     yaffs_GetObjectType(l))
 989                             < 0) {
 990                                 goto up_and_out;
 991                         }
 992
 993                         offset++;
 994                         f->f_pos++;
 995                 }
 996         }
 997
 998       up_and_out:
 999       out:
1000
1001         yaffs_GrossUnlock(dev);
1002
1003         return 0;
1004 }
1005
1006 /*
1007  * File creation. Allocate an inode, and we're done..
1008  */
1009 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1010 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1011                        dev_t rdev)
1012 #else
1013 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1014                        int rdev)
1015 #endif
1016 {
1017         struct inode *inode;
1018
1019         yaffs_Object *obj = NULL;
1020         yaffs_Device *dev;
1021
1022         yaffs_Object *parent = yaffs_InodeToObject(dir);
1023
1024         int error = -ENOSPC;
1025         uid_t uid = current->fsuid;
1026         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1027
1028         if((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1029                 mode |= S_ISGID;
1030
1031         if (parent) {
1032                 T(YAFFS_TRACE_OS,
1033                   (KERN_DEBUG "yaffs_mknod: parent object %d type %d\n",
1034                    parent->objectId, parent->variantType));
1035         } else {
1036                 T(YAFFS_TRACE_OS,
1037                   (KERN_DEBUG "yaffs_mknod: could not get parent object\n"));
1038                 return -EPERM;
1039         }
1040
1041         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1042                            "mode %x dev %x\n",
1043                            dentry->d_name.name, mode, rdev));
1044
1045         dev = parent->myDev;
1046
1047         yaffs_GrossLock(dev);
1048
1049         switch (mode & S_IFMT) {
1050         default:
1051                 /* Special (socket, fifo, device...) */
1052                 T(YAFFS_TRACE_OS, (KERN_DEBUG
1053                                    "yaffs_mknod: making special\n"));
1054 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1055                 obj =
1056                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1057                                        gid, old_encode_dev(rdev));
1058 #else
1059                 obj =
1060                     yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1061                                        gid, rdev);
1062 #endif
1063                 break;
1064         case S_IFREG:           /* file          */
1065                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1066                 obj =
1067                     yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1068                                     gid);
1069                 break;
1070         case S_IFDIR:           /* directory */
1071                 T(YAFFS_TRACE_OS,
1072                   (KERN_DEBUG "yaffs_mknod: making directory\n"));
1073                 obj =
1074                     yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1075                                          uid, gid);
1076                 break;
1077         case S_IFLNK:           /* symlink */
1078                 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
1079                 obj = NULL;     /* Do we ever get here? */
1080                 break;
1081         }
1082
1083         /* Can not call yaffs_get_inode() with gross lock held */
1084         yaffs_GrossUnlock(dev);
1085
1086         if (obj) {
1087                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1088                 d_instantiate(dentry, inode);
1089                 T(YAFFS_TRACE_OS,
1090                   (KERN_DEBUG "yaffs_mknod created object %d count = %d\n",
1091                    obj->objectId, atomic_read(&inode->i_count)));
1092                 error = 0;
1093         } else {
1094                 T(YAFFS_TRACE_OS,
1095                   (KERN_DEBUG "yaffs_mknod failed making object\n"));
1096                 error = -ENOMEM;
1097         }
1098
1099         return error;
1100 }
1101
1102 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1103 {
1104         int retVal;
1105         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mkdir\n"));
1106         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1107 #if 0
1108         /* attempt to fix dir bug - didn't work */
1109         if (!retVal) {
1110                 dget(dentry);
1111         }
1112 #endif
1113         return retVal;
1114 }
1115
1116 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1117 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1118                         struct nameidata *n)
1119 #else
1120 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1121 #endif
1122 {
1123         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_create\n"));
1124         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1125 }
1126
1127 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1128 {
1129         int retVal;
1130
1131         yaffs_Device *dev;
1132
1133         T(YAFFS_TRACE_OS,
1134           (KERN_DEBUG "yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1135            dentry->d_name.name));
1136
1137         dev = yaffs_InodeToObject(dir)->myDev;
1138
1139         yaffs_GrossLock(dev);
1140
1141         retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1142
1143         if (retVal == YAFFS_OK) {
1144                 dentry->d_inode->i_nlink--;
1145                 dir->i_version++;
1146                 yaffs_GrossUnlock(dev);
1147                 mark_inode_dirty(dentry->d_inode);
1148                 return 0;
1149         }
1150         yaffs_GrossUnlock(dev);
1151         return -ENOTEMPTY;
1152 }
1153
1154 /*
1155  * Create a link...
1156  */
1157 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1158                       struct dentry *dentry)
1159 {
1160         struct inode *inode = old_dentry->d_inode;
1161         yaffs_Object *obj = NULL;
1162         yaffs_Object *link = NULL;
1163         yaffs_Device *dev;
1164
1165         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_link\n"));
1166
1167         obj = yaffs_InodeToObject(inode);
1168         dev = obj->myDev;
1169
1170         yaffs_GrossLock(dev);
1171
1172         if (!S_ISDIR(inode->i_mode))    /* Don't link directories */
1173         {
1174                 link =
1175                     yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1176                                obj);
1177         }
1178
1179         if (link) {
1180                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1181                 d_instantiate(dentry, old_dentry->d_inode);
1182                 atomic_inc(&old_dentry->d_inode->i_count);
1183                 T(YAFFS_TRACE_OS,
1184                   (KERN_DEBUG "yaffs_link link count %d i_count %d\n",
1185                    old_dentry->d_inode->i_nlink,
1186                    atomic_read(&old_dentry->d_inode->i_count)));
1187
1188         }
1189
1190         yaffs_GrossUnlock(dev);
1191
1192         if (link) {
1193
1194                 return 0;
1195         }
1196
1197         return -EPERM;
1198 }
1199
1200 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1201                          const char *symname)
1202 {
1203         yaffs_Object *obj;
1204         yaffs_Device *dev;
1205         uid_t uid = current->fsuid;
1206         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
1207
1208         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_symlink\n"));
1209
1210         dev = yaffs_InodeToObject(dir)->myDev;
1211         yaffs_GrossLock(dev);
1212         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1213                                  S_IFLNK | S_IRWXUGO, uid, gid, symname);
1214         yaffs_GrossUnlock(dev);
1215
1216         if (obj) {
1217
1218                 struct inode *inode;
1219
1220                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1221                 d_instantiate(dentry, inode);
1222                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink created OK\n"));
1223                 return 0;
1224         } else {
1225                 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink not created\n"));
1226
1227         }
1228
1229         return -ENOMEM;
1230 }
1231
1232 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1233                              int datasync)
1234 {
1235
1236         yaffs_Object *obj;
1237         yaffs_Device *dev;
1238
1239         obj = yaffs_DentryToObject(dentry);
1240
1241         dev = obj->myDev;
1242
1243         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_object\n"));
1244         yaffs_GrossLock(dev);
1245         yaffs_FlushFile(obj, 1);
1246         yaffs_GrossUnlock(dev);
1247         return 0;
1248 }
1249
1250 /*
1251  * The VFS layer already does all the dentry stuff for rename.
1252  *
1253  * NB: POSIX says you can rename an object over an old object of the same name
1254  */
1255 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1256                         struct inode *new_dir, struct dentry *new_dentry)
1257 {
1258         yaffs_Device *dev;
1259         int retVal = YAFFS_FAIL;
1260         yaffs_Object *target;
1261
1262         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_rename\n"));
1263         dev = yaffs_InodeToObject(old_dir)->myDev;
1264
1265         yaffs_GrossLock(dev);
1266
1267         /* Check if the target is an existing directory that is not empty. */
1268         target =
1269             yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1270                                    new_dentry->d_name.name);
1271
1272
1273
1274         if (target &&
1275             target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1276             !list_empty(&target->variant.directoryVariant.children)) {
1277
1278                 T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n"));
1279
1280                 retVal = YAFFS_FAIL;
1281         } else {
1282
1283                 /* Now does unlinking internally using shadowing mechanism */
1284                 T(YAFFS_TRACE_OS, (KERN_DEBUG "calling yaffs_RenameObject\n"));
1285
1286                 retVal =
1287                     yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1288                                        old_dentry->d_name.name,
1289                                        yaffs_InodeToObject(new_dir),
1290                                        new_dentry->d_name.name);
1291
1292         }
1293         yaffs_GrossUnlock(dev);
1294
1295         if (retVal == YAFFS_OK) {
1296                 if(target) {
1297                         new_dentry->d_inode->i_nlink--;
1298                         mark_inode_dirty(new_dentry->d_inode);
1299                 }
1300
1301                 return 0;
1302         } else {
1303                 return -ENOTEMPTY;
1304         }
1305
1306 }
1307
1308 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1309 {
1310         struct inode *inode = dentry->d_inode;
1311         int error;
1312         yaffs_Device *dev;
1313
1314         T(YAFFS_TRACE_OS,
1315           (KERN_DEBUG "yaffs_setattr of object %d\n",
1316            yaffs_InodeToObject(inode)->objectId));
1317
1318         if ((error = inode_change_ok(inode, attr)) == 0) {
1319
1320                 dev = yaffs_InodeToObject(inode)->myDev;
1321                 yaffs_GrossLock(dev);
1322                 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1323                     YAFFS_OK) {
1324                         error = 0;
1325                 } else {
1326                         error = -EPERM;
1327                 }
1328                 yaffs_GrossUnlock(dev);
1329                 if (!error)
1330                         error = inode_setattr(inode, attr);
1331         }
1332         return error;
1333 }
1334
1335 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1336 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1337 {
1338         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1339         struct super_block *sb = dentry->d_sb;
1340 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1341 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1342 {
1343         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1344 #else
1345 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1346 {
1347         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1348 #endif
1349
1350         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_statfs\n"));
1351
1352         yaffs_GrossLock(dev);
1353
1354         buf->f_type = YAFFS_MAGIC;
1355         buf->f_bsize = sb->s_blocksize;
1356         buf->f_namelen = 255;
1357
1358         if(dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)){
1359                 /* Do this if chunk size is not a power of 2 */
1360
1361                 uint64_t bytesInDev;
1362                 uint64_t bytesFree;
1363
1364                 bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock +1))) *
1365                              ((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk));
1366
1367                 do_div(bytesInDev,sb->s_blocksize); /* bytesInDev becomes the number of blocks */
1368                 buf->f_blocks = bytesInDev;
1369
1370                 bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
1371                              ((uint64_t)(dev->nDataBytesPerChunk));
1372
1373                 do_div(bytesFree,sb->s_blocksize);
1374
1375                 buf->f_bfree = bytesFree;
1376
1377         } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1378
1379                 buf->f_blocks =
1380                            (dev->endBlock - dev->startBlock + 1) *
1381                             dev->nChunksPerBlock /
1382                             (sb->s_blocksize / dev->nDataBytesPerChunk);
1383                 buf->f_bfree =
1384                            yaffs_GetNumberOfFreeChunks(dev) /
1385                            (sb->s_blocksize / dev->nDataBytesPerChunk);
1386         } else {
1387                buf->f_blocks =
1388                            (dev->endBlock - dev->startBlock + 1) *
1389                            dev->nChunksPerBlock *
1390                            (dev->nDataBytesPerChunk / sb->s_blocksize);
1391
1392                        buf->f_bfree =
1393                            yaffs_GetNumberOfFreeChunks(dev) *
1394                            (dev->nDataBytesPerChunk / sb->s_blocksize);
1395         }
1396
1397
1398         buf->f_files = 0;
1399         buf->f_ffree = 0;
1400         buf->f_bavail = buf->f_bfree;
1401
1402         yaffs_GrossUnlock(dev);
1403         return 0;
1404 }
1405
1406
1407 /**
1408 static int yaffs_do_sync_fs(struct super_block *sb)
1409 {
1410
1411         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1412         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_do_sync_fs\n"));
1413
1414         if(sb->s_dirt) {
1415                 yaffs_GrossLock(dev);
1416
1417                 if(dev)
1418                         yaffs_CheckpointSave(dev);
1419
1420                 yaffs_GrossUnlock(dev);
1421
1422                 sb->s_dirt = 0;
1423         }
1424         return 0;
1425 }
1426 **/
1427
1428 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1429 static void yaffs_write_super(struct super_block *sb)
1430 #else
1431 static int yaffs_write_super(struct super_block *sb)
1432 #endif
1433 {
1434
1435         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n"));
1436 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
1437         return 0; /* yaffs_do_sync_fs(sb);*/
1438 #endif
1439 }
1440
1441
1442 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1443 static int yaffs_sync_fs(struct super_block *sb, int wait)
1444 #else
1445 static int yaffs_sync_fs(struct super_block *sb)
1446 #endif
1447 {
1448
1449         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n"));
1450
1451         return 0; /* yaffs_do_sync_fs(sb);*/
1452
1453 }
1454
1455
1456 static void yaffs_read_inode(struct inode *inode)
1457 {
1458         /* NB This is called as a side effect of other functions, but
1459          * we had to release the lock to prevent deadlocks, so
1460          * need to lock again.
1461          */
1462
1463         yaffs_Object *obj;
1464         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1465
1466         T(YAFFS_TRACE_OS,
1467           (KERN_DEBUG "yaffs_read_inode for %d\n", (int)inode->i_ino));
1468
1469         yaffs_GrossLock(dev);
1470
1471         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1472
1473         yaffs_FillInodeFromObject(inode, obj);
1474
1475         yaffs_GrossUnlock(dev);
1476 }
1477
1478 static LIST_HEAD(yaffs_dev_list);
1479
1480 #if 0 // not used
1481 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1482 {
1483         yaffs_Device    *dev = yaffs_SuperToDevice(sb);
1484
1485         if( *flags & MS_RDONLY ) {
1486                 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1487
1488                 T(YAFFS_TRACE_OS,
1489                         (KERN_DEBUG "yaffs_remount_fs: %s: RO\n", dev->name ));
1490
1491                 yaffs_GrossLock(dev);
1492
1493                 yaffs_FlushEntireDeviceCache(dev);
1494
1495                 yaffs_CheckpointSave(dev);
1496
1497                 if (mtd->sync)
1498                         mtd->sync(mtd);
1499
1500                 yaffs_GrossUnlock(dev);
1501         }
1502         else {
1503                 T(YAFFS_TRACE_OS,
1504                         (KERN_DEBUG "yaffs_remount_fs: %s: RW\n", dev->name ));
1505         }
1506
1507         return 0;
1508 }
1509 #endif
1510
1511 static void yaffs_put_super(struct super_block *sb)
1512 {
1513         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1514
1515         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_put_super\n"));
1516
1517         yaffs_GrossLock(dev);
1518
1519         yaffs_FlushEntireDeviceCache(dev);
1520
1521         yaffs_CheckpointSave(dev);
1522
1523         if (dev->putSuperFunc) {
1524                 dev->putSuperFunc(sb);
1525         }
1526
1527         yaffs_Deinitialise(dev);
1528
1529         yaffs_GrossUnlock(dev);
1530
1531         /* we assume this is protected by lock_kernel() in mount/umount */
1532         list_del(&dev->devList);
1533
1534         if(dev->spareBuffer){
1535                 YFREE(dev->spareBuffer);
1536                 dev->spareBuffer = NULL;
1537         }
1538
1539         kfree(dev);
1540 }
1541
1542
1543 static void yaffs_MTDPutSuper(struct super_block *sb)
1544 {
1545
1546         struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1547
1548         if (mtd->sync) {
1549                 mtd->sync(mtd);
1550         }
1551
1552         put_mtd_device(mtd);
1553 }
1554
1555
1556 static void yaffs_MarkSuperBlockDirty(void *vsb)
1557 {
1558         struct super_block *sb = (struct super_block *)vsb;
1559
1560         T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_MarkSuperBlockDirty() sb = %p\n",sb));
1561 //      if(sb)
1562 //              sb->s_dirt = 1;
1563 }
1564
1565 typedef struct {
1566         int inband_tags;
1567         int skip_checkpoint_read;
1568         int skip_checkpoint_write;
1569         int no_cache;
1570 } yaffs_options;
1571
1572 #define MAX_OPT_LEN 20
1573 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1574 {
1575         char cur_opt[MAX_OPT_LEN+1];
1576         int p;
1577         int error = 0;
1578
1579         /* Parse through the options which is a comma seperated list */
1580
1581         while(options_str && *options_str && !error){
1582                 memset(cur_opt,0,MAX_OPT_LEN+1);
1583                 p = 0;
1584
1585                 while(*options_str && *options_str != ','){
1586                         if(p < MAX_OPT_LEN){
1587                                 cur_opt[p] = *options_str;
1588                                 p++;
1589                         }
1590                         options_str++;
1591                 }
1592
1593                 if(!strcmp(cur_opt,"inband-tags"))
1594                         options->inband_tags = 1;
1595                 else if(!strcmp(cur_opt,"no-cache"))
1596                         options->no_cache = 1;
1597                 else if(!strcmp(cur_opt,"no-checkpoint-read"))
1598                         options->skip_checkpoint_read = 1;
1599                 else if(!strcmp(cur_opt,"no-checkpoint-write"))
1600                         options->skip_checkpoint_write = 1;
1601                 else if(!strcmp(cur_opt,"no-checkpoint")){
1602                         options->skip_checkpoint_read = 1;
1603                         options->skip_checkpoint_write = 1;
1604                 } else {
1605                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",cur_opt);
1606                         error = 1;
1607                 }
1608
1609         }
1610
1611         return error;
1612 }
1613
1614 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1615                                                      struct super_block *sb,
1616                                                      void *data, int silent)
1617 {
1618         int nBlocks;
1619         struct inode *inode = NULL;
1620         struct dentry *root;
1621         yaffs_Device *dev = 0;
1622         char devname_buf[BDEVNAME_SIZE + 1];
1623         struct mtd_info *mtd;
1624         int err;
1625         char *data_str = (char *)data;
1626
1627         yaffs_options options;
1628
1629         sb->s_magic = YAFFS_MAGIC;
1630         sb->s_op = &yaffs_super_ops;
1631         sb->s_flags |= MS_NOATIME;
1632
1633         if (!sb)
1634                 printk(KERN_INFO "yaffs: sb is NULL\n");
1635         else if (!sb->s_dev)
1636                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1637         else if (!yaffs_devname(sb, devname_buf))
1638                 printk(KERN_INFO "yaffs: devname is NULL\n");
1639         else
1640                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1641                        sb->s_dev,
1642                        yaffs_devname(sb, devname_buf));
1643
1644         if(!data_str)
1645                 data_str = "";
1646
1647         printk(KERN_INFO "yaffs: passed flags \"%s\"\n",data_str);
1648
1649         memset(&options,0,sizeof(options));
1650
1651         if(yaffs_parse_options(&options,data_str)){
1652                 /* Option parsing failed */
1653                 return NULL;
1654         }
1655
1656
1657         sb->s_blocksize = PAGE_CACHE_SIZE;
1658         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1659         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1660         T(YAFFS_TRACE_OS,
1661           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1662
1663 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1664         T(YAFFS_TRACE_OS,
1665           ("yaffs: Write verification disabled. All guarantees "
1666            "null and void\n"));
1667 #endif
1668
1669         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1670                                "\"%s\"\n",
1671                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
1672                                yaffs_devname(sb, devname_buf)));
1673
1674         /* Check it's an mtd device..... */
1675         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
1676                 return NULL;    /* This isn't an mtd device */
1677         }
1678         /* Get the device */
1679         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1680         if (!mtd) {
1681                 T(YAFFS_TRACE_ALWAYS,
1682                   ("yaffs: MTD device #%u doesn't appear to exist\n",
1683                    MINOR(sb->s_dev)));
1684                 return NULL;
1685         }
1686         /* Check it's NAND */
1687         if (mtd->type != MTD_NANDFLASH) {
1688                 T(YAFFS_TRACE_ALWAYS,
1689                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1690                 return NULL;
1691         }
1692
1693         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1694         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1695         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1696         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1697         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1698         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1699         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1700         T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1701         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1702         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1703         T(YAFFS_TRACE_OS, (" size %d\n", mtd->size));
1704
1705 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1706
1707         if (yaffsVersion == 1 &&
1708             WRITE_SIZE(mtd) >= 2048) {
1709             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n"));
1710             yaffsVersion = 2;
1711         }
1712
1713         /* Added NCB 26/5/2006 for completeness */
1714         if (yaffsVersion == 2 &&
1715             !options.inband_tags &&
1716             WRITE_SIZE(mtd) == 512){
1717             T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs1\n"));
1718             yaffsVersion = 1;
1719         }
1720
1721 #endif
1722
1723         if (yaffsVersion == 2) {
1724                 /* Check for version 2 style functions */
1725                 if (!mtd->erase ||
1726                     !mtd->block_isbad ||
1727                     !mtd->block_markbad ||
1728                     !mtd->read ||
1729                     !mtd->write ||
1730 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1731                     !mtd->read_oob || !mtd->write_oob) {
1732 #else
1733                     !mtd->write_ecc ||
1734                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1735 #endif
1736                         T(YAFFS_TRACE_ALWAYS,
1737                           ("yaffs: MTD device does not support required "
1738                            "functions\n"));;
1739                         return NULL;
1740                 }
1741
1742                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1743                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
1744                     !options.inband_tags) {
1745                         T(YAFFS_TRACE_ALWAYS,
1746                           ("yaffs: MTD device does not have the "
1747                            "right page sizes\n"));
1748                         return NULL;
1749                 }
1750         } else {
1751                 /* Check for V1 style functions */
1752                 if (!mtd->erase ||
1753                     !mtd->read ||
1754                     !mtd->write ||
1755 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1756                     !mtd->read_oob || !mtd->write_oob) {
1757 #else
1758                     !mtd->write_ecc ||
1759                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1760 #endif
1761                         T(YAFFS_TRACE_ALWAYS,
1762                           ("yaffs: MTD device does not support required "
1763                            "functions\n"));;
1764                         return NULL;
1765                 }
1766
1767                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
1768                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1769                         T(YAFFS_TRACE_ALWAYS,
1770                           ("yaffs: MTD device does not support have the "
1771                            "right page sizes\n"));
1772                         return NULL;
1773                 }
1774         }
1775
1776         /* OK, so if we got here, we have an MTD that's NAND and looks
1777          * like it has the right capabilities
1778          * Set the yaffs_Device up for mtd
1779          */
1780
1781 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1782         sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1783 #else
1784         sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
1785 #endif
1786         if (!dev) {
1787                 /* Deep shit could not allocate device structure */
1788                 T(YAFFS_TRACE_ALWAYS,
1789                   ("yaffs_read_super: Failed trying to allocate "
1790                    "yaffs_Device. \n"));
1791                 return NULL;
1792         }
1793
1794         memset(dev, 0, sizeof(yaffs_Device));
1795         dev->genericDevice = mtd;
1796         dev->name = mtd->name;
1797
1798         /* Set up the memory size parameters.... */
1799
1800         nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
1801         dev->startBlock = 0;
1802         dev->endBlock = nBlocks - 1;
1803         dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
1804         dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
1805         dev->nReservedBlocks = 5;
1806         dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
1807         dev->inbandTags = options.inband_tags;
1808
1809         /* ... and the functions. */
1810         if (yaffsVersion == 2) {
1811                 dev->writeChunkWithTagsToNAND =
1812                     nandmtd2_WriteChunkWithTagsToNAND;
1813                 dev->readChunkWithTagsFromNAND =
1814                     nandmtd2_ReadChunkWithTagsFromNAND;
1815                 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
1816                 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
1817                 dev->spareBuffer = YMALLOC(mtd->oobsize);
1818                 dev->isYaffs2 = 1;
1819 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1820                 dev->totalBytesPerChunk = mtd->writesize;
1821                 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
1822 #else
1823                 dev->totalBytesPerChunk = mtd->oobblock;
1824                 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
1825 #endif
1826                 nBlocks = mtd->size / mtd->erasesize;
1827
1828                 dev->startBlock = 0;
1829                 dev->endBlock = nBlocks - 1;
1830         } else {
1831 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1832                 /* use the MTD interface in yaffs_mtdif1.c */
1833                 dev->writeChunkWithTagsToNAND =
1834                         nandmtd1_WriteChunkWithTagsToNAND;
1835                 dev->readChunkWithTagsFromNAND =
1836                         nandmtd1_ReadChunkWithTagsFromNAND;
1837                 dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
1838                 dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
1839 #else
1840                 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
1841                 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
1842 #endif
1843                 dev->isYaffs2 = 0;
1844         }
1845         /* ... and common functions */
1846         dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
1847         dev->initialiseNAND = nandmtd_InitialiseNAND;
1848
1849         dev->putSuperFunc = yaffs_MTDPutSuper;
1850
1851         dev->superBlock = (void *)sb;
1852         dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
1853
1854
1855 #ifndef CONFIG_YAFFS_DOES_ECC
1856         dev->useNANDECC = 1;
1857 #endif
1858
1859 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
1860         dev->wideTnodesDisabled = 1;
1861 #endif
1862
1863         dev->skipCheckpointRead = options.skip_checkpoint_read;
1864         dev->skipCheckpointWrite = options.skip_checkpoint_write;
1865
1866         /* we assume this is protected by lock_kernel() in mount/umount */
1867         list_add_tail(&dev->devList, &yaffs_dev_list);
1868
1869         init_MUTEX(&dev->grossLock);
1870
1871         yaffs_GrossLock(dev);
1872
1873         err = yaffs_GutsInitialise(dev);
1874
1875         T(YAFFS_TRACE_OS,
1876           ("yaffs_read_super: guts initialised %s\n",
1877            (err == YAFFS_OK) ? "OK" : "FAILED"));
1878
1879         /* Release lock before yaffs_get_inode() */
1880         yaffs_GrossUnlock(dev);
1881
1882         /* Create root inode */
1883         if (err == YAFFS_OK)
1884                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
1885                                         yaffs_Root(dev));
1886
1887         if (!inode)
1888                 return NULL;
1889
1890         inode->i_op = &yaffs_dir_inode_operations;
1891         inode->i_fop = &yaffs_dir_operations;
1892
1893         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
1894
1895         root = d_alloc_root(inode);
1896
1897         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
1898
1899         if (!root) {
1900                 iput(inode);
1901                 return NULL;
1902         }
1903         sb->s_root = root;
1904
1905         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
1906         return sb;
1907 }
1908
1909
1910 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1911 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
1912                                          int silent)
1913 {
1914         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
1915 }
1916
1917 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1918 static int yaffs_read_super(struct file_system_type *fs,
1919                             int flags, const char *dev_name,
1920                             void *data, struct vfsmount *mnt)
1921 {
1922
1923         return get_sb_bdev(fs, flags, dev_name, data,
1924                            yaffs_internal_read_super_mtd, mnt);
1925 }
1926 #else
1927 static struct super_block *yaffs_read_super(struct file_system_type *fs,
1928                                             int flags, const char *dev_name,
1929                                             void *data)
1930 {
1931
1932         return get_sb_bdev(fs, flags, dev_name, data,
1933                            yaffs_internal_read_super_mtd);
1934 }
1935 #endif
1936
1937 static struct file_system_type yaffs_fs_type = {
1938         .owner = THIS_MODULE,
1939         .name = "yaffs",
1940         .get_sb = yaffs_read_super,
1941         .kill_sb = kill_block_super,
1942         .fs_flags = FS_REQUIRES_DEV,
1943 };
1944 #else
1945 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
1946                                             int silent)
1947 {
1948         return yaffs_internal_read_super(1, sb, data, silent);
1949 }
1950
1951 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
1952                       FS_REQUIRES_DEV);
1953 #endif
1954
1955
1956 #ifdef CONFIG_YAFFS_YAFFS2
1957
1958 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1959 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
1960                                           int silent)
1961 {
1962         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
1963 }
1964
1965 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
1966 static int yaffs2_read_super(struct file_system_type *fs,
1967                         int flags, const char *dev_name, void *data,
1968                         struct vfsmount *mnt)
1969 {
1970         return get_sb_bdev(fs, flags, dev_name, data,
1971                         yaffs2_internal_read_super_mtd, mnt);
1972 }
1973 #else
1974 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
1975                                              int flags, const char *dev_name,
1976                                              void *data)
1977 {
1978
1979         return get_sb_bdev(fs, flags, dev_name, data,
1980                            yaffs2_internal_read_super_mtd);
1981 }
1982 #endif
1983
1984 static struct file_system_type yaffs2_fs_type = {
1985         .owner = THIS_MODULE,
1986         .name = "yaffs2",
1987         .get_sb = yaffs2_read_super,
1988         .kill_sb = kill_block_super,
1989         .fs_flags = FS_REQUIRES_DEV,
1990 };
1991 #else
1992 static struct super_block *yaffs2_read_super(struct super_block *sb,
1993                                              void *data, int silent)
1994 {
1995         return yaffs_internal_read_super(2, sb, data, silent);
1996 }
1997
1998 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
1999                       FS_REQUIRES_DEV);
2000 #endif
2001
2002 #endif                          /* CONFIG_YAFFS_YAFFS2 */
2003
2004 static struct proc_dir_entry *my_proc_entry;
2005
2006 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
2007 {
2008         buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
2009         buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
2010         buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
2011         buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
2012         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
2013         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
2014         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
2015         buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
2016         buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2017         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2018         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2019         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2020         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2021         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2022         buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
2023         buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
2024         buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
2025         buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
2026         buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
2027         buf += sprintf(buf, "passiveGCs......... %d\n",
2028                     dev->passiveGarbageCollections);
2029         buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
2030         buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
2031         buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
2032         buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
2033         buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
2034         buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
2035         buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
2036         buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
2037         buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
2038         buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
2039         buf +=
2040             sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
2041         buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
2042         buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
2043         buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);
2044
2045         return buf;
2046 }
2047
2048 static int yaffs_proc_read(char *page,
2049                            char **start,
2050                            off_t offset, int count, int *eof, void *data)
2051 {
2052         struct list_head *item;
2053         char *buf = page;
2054         int step = offset;
2055         int n = 0;
2056
2057         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2058          * We use 'offset' (*ppos) to indicate where we are in devList.
2059          * This also assumes the user has posted a read buffer large
2060          * enough to hold the complete output; but that's life in /proc.
2061          */
2062
2063         *(int *)start = 1;
2064
2065         /* Print header first */
2066         if (step == 0) {
2067                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2068                                "\n%s\n%s\n", yaffs_fs_c_version,
2069                                yaffs_guts_c_version);
2070         }
2071
2072         /* hold lock_kernel while traversing yaffs_dev_list */
2073         lock_kernel();
2074
2075         /* Locate and print the Nth entry.  Order N-squared but N is small. */
2076         list_for_each(item, &yaffs_dev_list) {
2077                 yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
2078                 if (n < step) {
2079                         n++;
2080                         continue;
2081                 }
2082                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2083                 buf = yaffs_dump_dev(buf, dev);
2084                 break;
2085         }
2086         unlock_kernel();
2087
2088         return buf - page < count ? buf - page : count;
2089 }
2090
2091 /**
2092  * Set the verbosity of the warnings and error messages.
2093  *
2094  * Note that the names can only be a..z or _ with the current code.
2095  */
2096
2097 static struct {
2098         char *mask_name;
2099         unsigned mask_bitfield;
2100 } mask_flags[] = {
2101         {"allocate", YAFFS_TRACE_ALLOCATE},
2102         {"always", YAFFS_TRACE_ALWAYS},
2103         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2104         {"buffers", YAFFS_TRACE_BUFFERS},
2105         {"bug", YAFFS_TRACE_BUG},
2106         {"checkpt", YAFFS_TRACE_CHECKPOINT},
2107         {"deletion", YAFFS_TRACE_DELETION},
2108         {"erase", YAFFS_TRACE_ERASE},
2109         {"error", YAFFS_TRACE_ERROR},
2110         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2111         {"gc", YAFFS_TRACE_GC},
2112         {"mtd", YAFFS_TRACE_MTD},
2113         {"nandaccess", YAFFS_TRACE_NANDACCESS},
2114         {"os", YAFFS_TRACE_OS},
2115         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2116         {"scan", YAFFS_TRACE_SCAN},
2117         {"tracing", YAFFS_TRACE_TRACING},
2118
2119         {"verify", YAFFS_TRACE_VERIFY},
2120         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2121         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2122         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2123
2124         {"write", YAFFS_TRACE_WRITE},
2125         {"all", 0xffffffff},
2126         {"none", 0},
2127         {NULL, 0},
2128 };
2129
2130 #define MAX_MASK_NAME_LENGTH 40
2131 static int yaffs_proc_write(struct file *file, const char *buf,
2132                                          unsigned long count, void *data)
2133 {
2134         unsigned rg = 0, mask_bitfield;
2135         char *end;
2136         char *mask_name;
2137         const char *x;
2138         char substring[MAX_MASK_NAME_LENGTH+1];
2139         int i;
2140         int done = 0;
2141         int add, len = 0;
2142         int pos = 0;
2143
2144         rg = yaffs_traceMask;
2145
2146         while (!done && (pos < count)) {
2147                 done = 1;
2148                 while ((pos < count) && isspace(buf[pos])) {
2149                         pos++;
2150                 }
2151
2152                 switch (buf[pos]) {
2153                 case '+':
2154                 case '-':
2155                 case '=':
2156                         add = buf[pos];
2157                         pos++;
2158                         break;
2159
2160                 default:
2161                         add = ' ';
2162                         break;
2163                 }
2164                 mask_name = NULL;
2165
2166                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2167                 if (end > buf + pos) {
2168                         mask_name = "numeral";
2169                         len = end - (buf + pos);
2170                         pos += len;
2171                         done = 0;
2172                 } else {
2173                         for(x = buf + pos, i = 0;
2174                             (*x == '_' || (*x >='a' && *x <= 'z')) &&
2175                             i <MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2176                             substring[i] = *x;
2177                         substring[i] = '\0';
2178
2179                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2180                                 if(strcmp(substring,mask_flags[i].mask_name) == 0){
2181                                         mask_name = mask_flags[i].mask_name;
2182                                         mask_bitfield = mask_flags[i].mask_bitfield;
2183                                         done = 0;
2184                                         break;
2185                                 }
2186                         }
2187                 }
2188
2189                 if (mask_name != NULL) {
2190                         done = 0;
2191                         switch(add) {
2192                         case '-':
2193                                 rg &= ~mask_bitfield;
2194                                 break;
2195                         case '+':
2196                                 rg |= mask_bitfield;
2197                                 break;
2198                         case '=':
2199                                 rg = mask_bitfield;
2200                                 break;
2201                         default:
2202                                 rg |= mask_bitfield;
2203                                 break;
2204                         }
2205                 }
2206         }
2207
2208         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2209
2210         printk("new trace = 0x%08X\n",yaffs_traceMask);
2211
2212         if (rg & YAFFS_TRACE_ALWAYS) {
2213                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2214                         char flag;
2215                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2216                         printk("%c%s\n", flag, mask_flags[i].mask_name);
2217                 }
2218         }
2219
2220         return count;
2221 }
2222
2223 /* Stuff to handle installation of file systems */
2224 struct file_system_to_install {
2225         struct file_system_type *fst;
2226         int installed;
2227 };
2228
2229 static struct file_system_to_install fs_to_install[] = {
2230 //#ifdef CONFIG_YAFFS_YAFFS1
2231         {&yaffs_fs_type, 0},
2232 //#endif
2233 //#ifdef CONFIG_YAFFS_YAFFS2
2234         {&yaffs2_fs_type, 0},
2235 //#endif
2236         {NULL, 0}
2237 };
2238
2239 static int __init init_yaffs_fs(void)
2240 {
2241         int error = 0;
2242         struct file_system_to_install *fsinst;
2243
2244         T(YAFFS_TRACE_ALWAYS,
2245           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2246
2247         /* Install the proc_fs entry */
2248         my_proc_entry = create_proc_entry("yaffs",
2249                                                S_IRUGO | S_IFREG,
2250                                                &proc_root);
2251
2252         if (my_proc_entry) {
2253                 my_proc_entry->write_proc = yaffs_proc_write;
2254                 my_proc_entry->read_proc = yaffs_proc_read;
2255                 my_proc_entry->data = NULL;
2256         } else {
2257                 return -ENOMEM;
2258         }
2259
2260         /* Now add the file system entries */
2261
2262         fsinst = fs_to_install;
2263
2264         while (fsinst->fst && !error) {
2265                 error = register_filesystem(fsinst->fst);
2266                 if (!error) {
2267                         fsinst->installed = 1;
2268                 }
2269                 fsinst++;
2270         }
2271
2272         /* Any errors? uninstall  */
2273         if (error) {
2274                 fsinst = fs_to_install;
2275
2276                 while (fsinst->fst) {
2277                         if (fsinst->installed) {
2278                                 unregister_filesystem(fsinst->fst);
2279                                 fsinst->installed = 0;
2280                         }
2281                         fsinst++;
2282                 }
2283         }
2284
2285         return error;
2286 }
2287
2288 static void __exit exit_yaffs_fs(void)
2289 {
2290
2291         struct file_system_to_install *fsinst;
2292
2293         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2294                                " removing. \n"));
2295
2296         remove_proc_entry("yaffs", &proc_root);
2297
2298         fsinst = fs_to_install;
2299
2300         while (fsinst->fst) {
2301                 if (fsinst->installed) {
2302                         unregister_filesystem(fsinst->fst);
2303                         fsinst->installed = 0;
2304                 }
2305                 fsinst++;
2306         }
2307
2308 }
2309
2310 module_init(init_yaffs_fs)
2311 module_exit(exit_yaffs_fs)
2312
2313 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2314 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2315 MODULE_LICENSE("GPL");