yaffs_fs.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2009 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  * Acknowledgements:
   9  * Luc van OostenRyck for numerous patches.
  10  * Nick Bane for numerous patches.
  11  * Nick Bane for 2.5/2.6 integration.
  12  * Andras Toth for mknod rdev issue.
  13  * Michael Fischer for finding the problem with inode inconsistency.
  14  * Some code bodily lifted from JFFS
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 /*
  22  *
  23  * This is the file system front-end to YAFFS that hooks it up to
  24  * the VFS.
  25  *
  26  * Special notes:
  27  * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
  28  *         this superblock
  29  * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this
  30  *         superblock
  31  * >> inode->u.generic_ip points to the associated yaffs_Object.
  32  */
  33
  34 const char *yaffs_fs_c_version =
  35     "$Id: yaffs_fs.c,v 1.102 2010-03-15 23:10:33 charles Exp $";
  36 extern const char *yaffs_guts_c_version;
  37
  38 #include <linux/version.h>
  39
  40 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
  41 #define YAFFS_COMPILE_BACKGROUND
  42 #endif
  43
  44 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28))
  45 #define YAFFS_COMPILE_EXPORTFS
  46 #endif
  47
  48
  49 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
  50 #include <linux/config.h>
  51 #endif
  52 #include <linux/kernel.h>
  53 #include <linux/module.h>
  54 #include <linux/slab.h>
  55 #include <linux/init.h>
  56 #include <linux/fs.h>
  57 #include <linux/proc_fs.h>
  58 #include <linux/smp_lock.h>
  59 #include <linux/pagemap.h>
  60 #include <linux/mtd/mtd.h>
  61 #include <linux/interrupt.h>
  62 #include <linux/string.h>
  63 #include <linux/ctype.h>
  64
  65 #ifdef YAFFS_COMPILE_EXPORTFS
  66 #include <linux/exportfs.h>
  67 #endif
  68
  69 #ifdef YAFFS_COMPILE_BACKGROUND
  70 #include <linux/kthread.h>
  71 #include <linux/delay.h>
  72 #include <linux/freezer.h>
  73 #endif
  74
  75
  76 #include "asm/div64.h"
  77
  78
  79 #define LOCK_TRACE 0
  80
  81 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
  82
  83 #include <linux/statfs.h>       /* Added NCB 15-8-2003 */
  84 #include <linux/statfs.h>
  85 #define UnlockPage(p) unlock_page(p)
  86 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
  87
  88 /* FIXME: use sb->s_id instead ? */
  89 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)
  90
  91 #else
  92
  93 #include <linux/locks.h>
  94 #define BDEVNAME_SIZE           0
  95 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
  96
  97 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
  98 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
  99 #define __user
 100 #endif
 101
 102 #endif
 103
 104 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
 105 #define YPROC_ROOT  (&proc_root)
 106 #else
 107 #define YPROC_ROOT  NULL
 108 #endif
 109
 110 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 111 #define WRITE_SIZE_STR "writesize"
 112 #define WRITE_SIZE(mtd) ((mtd)->writesize)
 113 #else
 114 #define WRITE_SIZE_STR "oobblock"
 115 #define WRITE_SIZE(mtd) ((mtd)->oobblock)
 116 #endif
 117
 118 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
 119 #define YAFFS_USE_WRITE_BEGIN_END 1
 120 #else
 121 #define YAFFS_USE_WRITE_BEGIN_END 0
 122 #endif
 123
 124 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
 125 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
 126 {
 127         uint64_t result = partition_size;
 128         do_div(result, block_size);
 129         return (uint32_t)result;
 130 }
 131 #else
 132 #define YCALCBLOCKS(s, b) ((s)/(b))
 133 #endif
 134
 135 #include <linux/uaccess.h>
 136
 137 #include "yportenv.h"
 138 #include "yaffs_trace.h"
 139 #include "yaffs_guts.h"
 140
 141 #include "yaffs_linux.h"
 142
 143 #include <linux/mtd/mtd.h>
 144 #include "yaffs_mtdif.h"
 145 #include "yaffs_mtdif1.h"
 146 #include "yaffs_mtdif2.h"
 147
 148 unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
 149 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
 150 unsigned int yaffs_auto_checkpoint = 1;
 151 unsigned int yaffs_gc_control = 1;
 152
 153 /* Module Parameters */
 154 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 155 module_param(yaffs_traceMask, uint, 0644);
 156 module_param(yaffs_wr_attempts, uint, 0644);
 157 module_param(yaffs_auto_checkpoint, uint, 0644);
 158 module_param(yaffs_gc_control, uint, 0644);
 159 #else
 160 MODULE_PARM(yaffs_traceMask, "i");
 161 MODULE_PARM(yaffs_wr_attempts, "i");
 162 MODULE_PARM(yaffs_auto_checkpoint, "i");
 163 MODULE_PARM(yaffs_gc_control, "i");
 164 #endif
 165
 166 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
 167 /* use iget and read_inode */
 168 #define Y_IGET(sb, inum) iget((sb), (inum))
 169 static void yaffs_read_inode(struct inode *inode);
 170
 171 #else
 172 /* Call local equivalent */
 173 #define YAFFS_USE_OWN_IGET
 174 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
 175
 176 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
 177 #endif
 178
 179 /*#define T(x) printk x */
 180
 181 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
 182 #define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
 183 #else
 184 #define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
 185 #endif
 186
 187 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
 188 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
 189
 190 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 191 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
 192 #else
 193 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
 194 #endif
 195
 196
 197 #define update_dir_time(dir) do {\
 198                         (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
 199                 } while(0)
 200
 201 static void yaffs_put_super(struct super_block *sb);
 202
 203 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 204                                 loff_t *pos);
 205 static ssize_t yaffs_hold_space(struct file *f);
 206 static void yaffs_release_space(struct file *f);
 207
 208 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 209 static int yaffs_file_flush(struct file *file, fl_owner_t id);
 210 #else
 211 static int yaffs_file_flush(struct file *file);
 212 #endif
 213
 214 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 215                                 int datasync);
 216
 217 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 218
 219 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 220 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 221                         struct nameidata *n);
 222 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 223                                         struct nameidata *n);
 224 #else
 225 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 226 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 227 #endif
 228 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 229                         struct dentry *dentry);
 230 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 231 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 232                         const char *symname);
 233 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 234
 235 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 236 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 237                         dev_t dev);
 238 #else
 239 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 240                         int dev);
 241 #endif
 242 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 243                         struct inode *new_dir, struct dentry *new_dentry);
 244 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 245
 246 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 247 static int yaffs_sync_fs(struct super_block *sb, int wait);
 248 static void yaffs_write_super(struct super_block *sb);
 249 #else
 250 static int yaffs_sync_fs(struct super_block *sb);
 251 static int yaffs_write_super(struct super_block *sb);
 252 #endif
 253
 254 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 255 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
 256 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 257 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 258 #else
 259 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 260 #endif
 261
 262 #ifdef YAFFS_HAS_PUT_INODE
 263 static void yaffs_put_inode(struct inode *inode);
 264 #endif
 265
 266 static void yaffs_delete_inode(struct inode *);
 267 static void yaffs_clear_inode(struct inode *);
 268
 269 static int yaffs_readpage(struct file *file, struct page *page);
 270 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 271 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 272 #else
 273 static int yaffs_writepage(struct page *page);
 274 #endif
 275
 276
 277 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
 278 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 279                                 loff_t pos, unsigned len, unsigned flags,
 280                                 struct page **pagep, void **fsdata);
 281 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 282                                 loff_t pos, unsigned len, unsigned copied,
 283                                 struct page *pg, void *fsdadata);
 284 #else
 285 static int yaffs_prepare_write(struct file *f, struct page *pg,
 286                                 unsigned offset, unsigned to);
 287 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 288                                 unsigned to);
 289
 290 #endif
 291
 292 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
 293                                 int buflen);
 294 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 295 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 296 #else
 297 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 298 #endif
 299 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
 300
 301 static struct address_space_operations yaffs_file_address_operations = {
 302         .readpage = yaffs_readpage,
 303         .writepage = yaffs_writepage,
 304 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 305         .write_begin = yaffs_write_begin,
 306         .write_end = yaffs_write_end,
 307 #else
 308         .prepare_write = yaffs_prepare_write,
 309         .commit_write = yaffs_commit_write,
 310 #endif
 311 };
 312
 313 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
 314 static const struct file_operations yaffs_file_operations = {
 315         .read = do_sync_read,
 316         .write = do_sync_write,
 317         .aio_read = generic_file_aio_read,
 318         .aio_write = generic_file_aio_write,
 319         .mmap = generic_file_mmap,
 320         .flush = yaffs_file_flush,
 321         .fsync = yaffs_sync_object,
 322         .splice_read = generic_file_splice_read,
 323         .splice_write = generic_file_splice_write,
 324         .llseek = generic_file_llseek,
 325 };
 326
 327 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
 328
 329 static const struct file_operations yaffs_file_operations = {
 330         .read = do_sync_read,
 331         .write = do_sync_write,
 332         .aio_read = generic_file_aio_read,
 333         .aio_write = generic_file_aio_write,
 334         .mmap = generic_file_mmap,
 335         .flush = yaffs_file_flush,
 336         .fsync = yaffs_sync_object,
 337         .sendfile = generic_file_sendfile,
 338 };
 339
 340 #else
 341
 342 static const struct file_operations yaffs_file_operations = {
 343         .read = generic_file_read,
 344         .write = generic_file_write,
 345         .mmap = generic_file_mmap,
 346         .flush = yaffs_file_flush,
 347         .fsync = yaffs_sync_object,
 348 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 349         .sendfile = generic_file_sendfile,
 350 #endif
 351 };
 352 #endif
 353
 354 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
 355 static void zero_user_segment(struct page *page, unsigned start, unsigned end)
 356 {
 357         void * kaddr = kmap_atomic(page, KM_USER0);
 358         memset(kaddr + start, 0, end - start);
 359         kunmap_atomic(kaddr, KM_USER0);
 360         flush_dcache_page(page);
 361 }
 362 #endif
 363
 364
 365 static const struct inode_operations yaffs_file_inode_operations = {
 366         .setattr = yaffs_setattr,
 367 };
 368
 369 static const struct inode_operations yaffs_symlink_inode_operations = {
 370         .readlink = yaffs_readlink,
 371         .follow_link = yaffs_follow_link,
 372         .setattr = yaffs_setattr,
 373 };
 374
 375 static const struct inode_operations yaffs_dir_inode_operations = {
 376         .create = yaffs_create,
 377         .lookup = yaffs_lookup,
 378         .link = yaffs_link,
 379         .unlink = yaffs_unlink,
 380         .symlink = yaffs_symlink,
 381         .mkdir = yaffs_mkdir,
 382         .rmdir = yaffs_unlink,
 383         .mknod = yaffs_mknod,
 384         .rename = yaffs_rename,
 385         .setattr = yaffs_setattr,
 386 };
 387
 388 static const struct file_operations yaffs_dir_operations = {
 389         .read = generic_read_dir,
 390         .readdir = yaffs_readdir,
 391         .fsync = yaffs_sync_object,
 392         .llseek = yaffs_dir_llseek,
 393 };
 394
 395 static const struct super_operations yaffs_super_ops = {
 396         .statfs = yaffs_statfs,
 397
 398 #ifndef YAFFS_USE_OWN_IGET
 399         .read_inode = yaffs_read_inode,
 400 #endif
 401 #ifdef YAFFS_HAS_PUT_INODE
 402         .put_inode = yaffs_put_inode,
 403 #endif
 404         .put_super = yaffs_put_super,
 405         .delete_inode = yaffs_delete_inode,
 406         .clear_inode = yaffs_clear_inode,
 407         .sync_fs = yaffs_sync_fs,
 408         .write_super = yaffs_write_super,
 409 };
 410
 411 static unsigned yaffs_gc_control_callback(yaffs_Device *dev)
 412 {
 413         return yaffs_gc_control;
 414 }
 415
 416 static void yaffs_GrossLock(yaffs_Device *dev)
 417 {
 418         T(LOCK_TRACE && YAFFS_TRACE_OS, ("yaffs locking %p\n", current));
 419         down(&(yaffs_DeviceToContext(dev)->grossLock));
 420         T(LOCK_TRACE && YAFFS_TRACE_OS, ("yaffs locked %p\n", current));
 421 }
 422
 423 static void yaffs_GrossUnlock(yaffs_Device *dev)
 424 {
 425         T(LOCK_TRACE && YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current));
 426         up(&(yaffs_DeviceToContext(dev)->grossLock));
 427 }
 428
 429 #ifdef YAFFS_COMPILE_EXPORTFS
 430
 431 static struct inode *
 432 yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation)
 433 {
 434         return Y_IGET(sb, ino);
 435 }
 436
 437 static struct dentry *
 438 yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
 439 {
 440         return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode) ;
 441 }
 442
 443 static struct dentry *
 444  yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
 445 {
 446         return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode);
 447 }
 448
 449 struct dentry *yaffs2_get_parent(struct dentry *dentry)
 450 {
 451
 452         struct super_block *sb = dentry->d_inode->i_sb;
 453         struct dentry *parent = ERR_PTR(-ENOENT);
 454         struct inode *inode;
 455         unsigned long parent_ino;
 456         yaffs_Object *d_obj;
 457         yaffs_Object *parent_obj;
 458
 459         d_obj = yaffs_InodeToObject(dentry->d_inode);
 460
 461         if (d_obj) {
 462                 parent_obj = d_obj->parent;
 463                 if (parent_obj) {
 464                         parent_ino = yaffs_GetObjectInode(parent_obj);
 465                         inode = Y_IGET(sb, parent_ino);
 466
 467                         if (IS_ERR(inode)) {
 468                                 parent = ERR_CAST(inode);
 469                         } else {
 470                                 parent = d_obtain_alias(inode);
 471                                 if (!IS_ERR(parent)) {
 472                                         parent = ERR_PTR(-ENOMEM);
 473                                         iput(inode);
 474                                 }
 475                         }
 476                 }
 477         }
 478
 479         return parent;
 480 }
 481
 482 /* Just declare a zero structure as a NULL value implies
 483  * using the default functions of expfs.
 484  */
 485
 486 static struct export_operations yaffs_export_ops =
 487 {
 488         .fh_to_dentry = yaffs2_fh_to_dentry,
 489         .fh_to_parent = yaffs2_fh_to_parent,
 490         .get_parent = yaffs2_get_parent,
 491 } ;
 492
 493 #endif
 494
 495 /*-----------------------------------------------------------------*/
 496 /* Directory search context allows us to unlock access to yaffs during
 497  * filldir without causing problems with the directory being modified.
 498  * This is similar to the tried and tested mechanism used in yaffs direct.
 499  *
 500  * A search context iterates along a doubly linked list of siblings in the
 501  * directory. If the iterating object is deleted then this would corrupt
 502  * the list iteration, likely causing a crash. The search context avoids
 503  * this by using the removeObjectCallback to move the search context to the
 504  * next object before the object is deleted.
 505  *
 506  * Many readdirs (and thus seach conexts) may be alive simulateously so
 507  * each yaffs_Device has a list of these.
 508  *
 509  * A seach context lives for the duration of a readdir.
 510  *
 511  * All these functions must be called while yaffs is locked.
 512  */
 513
 514 struct yaffs_SearchContext {
 515         yaffs_Device *dev;
 516         yaffs_Object *dirObj;
 517         yaffs_Object *nextReturn;
 518         struct ylist_head others;
 519 };
 520
 521 /*
 522  * yaffs_NewSearch() creates a new search context, initialises it and
 523  * adds it to the device's search context list.
 524  *
 525  * Called at start of readdir.
 526  */
 527 static struct yaffs_SearchContext * yaffs_NewSearch(yaffs_Object *dir)
 528 {
 529         yaffs_Device *dev = dir->myDev;
 530         struct yaffs_SearchContext *sc = YMALLOC(sizeof(struct yaffs_SearchContext));
 531         if(sc){
 532                 sc->dirObj = dir;
 533                 sc->dev = dev;
 534                 if( ylist_empty(&sc->dirObj->variant.directoryVariant.children))
 535                         sc->nextReturn = NULL;
 536                 else
 537                         sc->nextReturn = ylist_entry(
 538                                 dir->variant.directoryVariant.children.next,
 539                                 yaffs_Object,siblings);
 540                 YINIT_LIST_HEAD(&sc->others);
 541                 ylist_add(&sc->others,&(yaffs_DeviceToContext(dev)->searchContexts));
 542         }
 543         return sc;
 544 }
 545
 546 /*
 547  * yaffs_EndSearch() disposes of a search context and cleans up.
 548  */
 549 static void yaffs_EndSearch(struct yaffs_SearchContext * sc)
 550 {
 551         if(sc){
 552                 ylist_del(&sc->others);
 553                 YFREE(sc);
 554         }
 555 }
 556
 557 /*
 558  * yaffs_SearchAdvance() moves a search context to the next object.
 559  * Called when the search iterates or when an object removal causes
 560  * the search context to be moved to the next object.
 561  */
 562 static void yaffs_SearchAdvance(struct yaffs_SearchContext *sc)
 563 {
 564         if(!sc)
 565                 return;
 566
 567         if( sc->nextReturn == NULL ||
 568                 ylist_empty(&sc->dirObj->variant.directoryVariant.children))
 569                 sc->nextReturn = NULL;
 570         else {
 571                 struct ylist_head *next = sc->nextReturn->siblings.next;
 572
 573                 if( next == &sc->dirObj->variant.directoryVariant.children)
 574                         sc->nextReturn = NULL; /* end of list */
 575                 else
 576                         sc->nextReturn = ylist_entry(next,yaffs_Object,siblings);
 577         }
 578 }
 579
 580 /*
 581  * yaffs_RemoveObjectCallback() is called when an object is unlinked.
 582  * We check open search contexts and advance any which are currently
 583  * on the object being iterated.
 584  */
 585 static void yaffs_RemoveObjectCallback(yaffs_Object *obj)
 586 {
 587
 588         struct ylist_head *i;
 589         struct yaffs_SearchContext *sc;
 590         struct ylist_head *search_contexts = &(yaffs_DeviceToContext(obj->myDev)->searchContexts);
 591
 592
 593         /* Iterate through the directory search contexts.
 594          * If any are currently on the object being removed, then advance
 595          * the search context to the next object to prevent a hanging pointer.
 596          */
 597          ylist_for_each(i, search_contexts) {
 598                 if (i) {
 599                         sc = ylist_entry(i, struct yaffs_SearchContext,others);
 600                         if(sc->nextReturn == obj)
 601                                 yaffs_SearchAdvance(sc);
 602                 }
 603         }
 604
 605 }
 606
 607
 608 /*-----------------------------------------------------------------*/
 609
 610 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
 611                         int buflen)
 612 {
 613         unsigned char *alias;
 614         int ret;
 615
 616         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 617
 618         yaffs_GrossLock(dev);
 619
 620         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 621
 622         yaffs_GrossUnlock(dev);
 623
 624         if (!alias)
 625                 return -ENOMEM;
 626
 627         ret = vfs_readlink(dentry, buffer, buflen, alias);
 628         kfree(alias);
 629         return ret;
 630 }
 631
 632 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 633 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 634 #else
 635 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 636 #endif
 637 {
 638         unsigned char *alias;
 639         int ret;
 640         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
 641
 642         yaffs_GrossLock(dev);
 643
 644         alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
 645
 646         yaffs_GrossUnlock(dev);
 647
 648         if (!alias) {
 649                 ret = -ENOMEM;
 650                 goto out;
 651         }
 652
 653         ret = vfs_follow_link(nd, alias);
 654         kfree(alias);
 655 out:
 656 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 657         return ERR_PTR(ret);
 658 #else
 659         return ret;
 660 #endif
 661 }
 662
 663 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 664                                 yaffs_Object *obj);
 665
 666 /*
 667  * Lookup is used to find objects in the fs
 668  */
 669 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 670
 671 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 672                                 struct nameidata *n)
 673 #else
 674 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 675 #endif
 676 {
 677         yaffs_Object *obj;
 678         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 679
 680         yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 681
 682         if(current != yaffs_DeviceToContext(dev)->readdirProcess)
 683                 yaffs_GrossLock(dev);
 684
 685         T(YAFFS_TRACE_OS,
 686                 ("yaffs_lookup for %d:%s\n",
 687                 yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 688
 689         obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
 690                                         dentry->d_name.name);
 691
 692         obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
 693
 694         /* Can't hold gross lock when calling yaffs_get_inode() */
 695         if(current != yaffs_DeviceToContext(dev)->readdirProcess)
 696                 yaffs_GrossUnlock(dev);
 697
 698         if (obj) {
 699                 T(YAFFS_TRACE_OS,
 700                         ("yaffs_lookup found %d\n", obj->objectId));
 701
 702                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 703
 704                 if (inode) {
 705                         T(YAFFS_TRACE_OS,
 706                                 ("yaffs_loookup dentry \n"));
 707 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 708  * d_add even if NULL inode */
 709 #if 0
 710                         /*dget(dentry); // try to solve directory bug */
 711                         d_add(dentry, inode);
 712
 713                         /* return dentry; */
 714                         return NULL;
 715 #endif
 716                 }
 717
 718         } else {
 719                 T(YAFFS_TRACE_OS, ("yaffs_lookup not found\n"));
 720
 721         }
 722
 723 /* added NCB for 2.5/6 compatability - forces add even if inode is
 724  * NULL which creates dentry hash */
 725         d_add(dentry, inode);
 726
 727         return NULL;
 728 }
 729
 730
 731 #ifdef YAFFS_HAS_PUT_INODE
 732
 733 /* For now put inode is just for debugging
 734  * Put inode is called when the inode **structure** is put.
 735  */
 736 static void yaffs_put_inode(struct inode *inode)
 737 {
 738         T(YAFFS_TRACE_OS,
 739                 ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
 740                 atomic_read(&inode->i_count)));
 741
 742 }
 743 #endif
 744
 745 /* clear is called to tell the fs to release any per-inode data it holds */
 746 static void yaffs_clear_inode(struct inode *inode)
 747 {
 748         yaffs_Object *obj;
 749         yaffs_Device *dev;
 750
 751         obj = yaffs_InodeToObject(inode);
 752
 753         T(YAFFS_TRACE_OS,
 754                 ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 755                 atomic_read(&inode->i_count),
 756                 obj ? "object exists" : "null object"));
 757
 758         if (obj) {
 759                 dev = obj->myDev;
 760                 yaffs_GrossLock(dev);
 761
 762                 /* Clear the association between the inode and
 763                  * the yaffs_Object.
 764                  */
 765                 obj->myInode = NULL;
 766                 yaffs_InodeToObjectLV(inode) = NULL;
 767
 768                 /* If the object freeing was deferred, then the real
 769                  * free happens now.
 770                  * This should fix the inode inconsistency problem.
 771                  */
 772
 773                 yaffs_HandleDeferedFree(obj);
 774
 775                 yaffs_GrossUnlock(dev);
 776         }
 777
 778 }
 779
 780 /* delete is called when the link count is zero and the inode
 781  * is put (ie. nobody wants to know about it anymore, time to
 782  * delete the file).
 783  * NB Must call clear_inode()
 784  */
 785 static void yaffs_delete_inode(struct inode *inode)
 786 {
 787         yaffs_Object *obj = yaffs_InodeToObject(inode);
 788         yaffs_Device *dev;
 789
 790         T(YAFFS_TRACE_OS,
 791                 ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
 792                 atomic_read(&inode->i_count),
 793                 obj ? "object exists" : "null object"));
 794
 795         if (obj) {
 796                 dev = obj->myDev;
 797                 yaffs_GrossLock(dev);
 798                 yaffs_DeleteObject(obj);
 799                 yaffs_GrossUnlock(dev);
 800         }
 801 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 802         truncate_inode_pages(&inode->i_data, 0);
 803 #endif
 804         clear_inode(inode);
 805 }
 806
 807 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 808 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 809 #else
 810 static int yaffs_file_flush(struct file *file)
 811 #endif
 812 {
 813         yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
 814
 815         yaffs_Device *dev = obj->myDev;
 816
 817         T(YAFFS_TRACE_OS,
 818                 ("yaffs_file_flush object %d (%s)\n", obj->objectId,
 819                 obj->dirty ? "dirty" : "clean"));
 820
 821         yaffs_GrossLock(dev);
 822
 823         yaffs_FlushFile(obj, 1, 0);
 824
 825         yaffs_GrossUnlock(dev);
 826
 827         return 0;
 828 }
 829
 830 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 831 {
 832         /* Lifted from jffs2 */
 833
 834         yaffs_Object *obj;
 835         unsigned char *pg_buf;
 836         int ret;
 837
 838         yaffs_Device *dev;
 839
 840         T(YAFFS_TRACE_OS, ("yaffs_readpage_nolock at %08x, size %08x\n",
 841                         (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 842                         (unsigned)PAGE_CACHE_SIZE));
 843
 844         obj = yaffs_DentryToObject(f->f_dentry);
 845
 846         dev = obj->myDev;
 847
 848 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 849         BUG_ON(!PageLocked(pg));
 850 #else
 851         if (!PageLocked(pg))
 852                 PAGE_BUG(pg);
 853 #endif
 854
 855         pg_buf = kmap(pg);
 856         /* FIXME: Can kmap fail? */
 857
 858         yaffs_GrossLock(dev);
 859
 860         ret = yaffs_ReadDataFromFile(obj, pg_buf,
 861                                 pg->index << PAGE_CACHE_SHIFT,
 862                                 PAGE_CACHE_SIZE);
 863
 864         yaffs_GrossUnlock(dev);
 865
 866         if (ret >= 0)
 867                 ret = 0;
 868
 869         if (ret) {
 870                 ClearPageUptodate(pg);
 871                 SetPageError(pg);
 872         } else {
 873                 SetPageUptodate(pg);
 874                 ClearPageError(pg);
 875         }
 876
 877         flush_dcache_page(pg);
 878         kunmap(pg);
 879
 880         T(YAFFS_TRACE_OS, ("yaffs_readpage_nolock done\n"));
 881         return ret;
 882 }
 883
 884 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
 885 {
 886         int ret = yaffs_readpage_nolock(f, pg);
 887         UnlockPage(pg);
 888         return ret;
 889 }
 890
 891 static int yaffs_readpage(struct file *f, struct page *pg)
 892 {
 893         int ret;
 894
 895         T(YAFFS_TRACE_OS, ("yaffs_readpage\n"));
 896         ret=yaffs_readpage_unlock(f, pg);
 897         T(YAFFS_TRACE_OS, ("yaffs_readpage done\n"));
 898         return ret;
 899 }
 900
 901 /* writepage inspired by/stolen from smbfs */
 902
 903 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 904 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 905 #else
 906 static int yaffs_writepage(struct page *page)
 907 #endif
 908 {
 909         struct address_space *mapping = page->mapping;
 910         struct inode *inode;
 911         unsigned long end_index;
 912         char *buffer;
 913         yaffs_Object *obj;
 914         int nWritten = 0;
 915         unsigned nBytes;
 916         loff_t i_size;
 917
 918         if (!mapping)
 919                 BUG();
 920         inode = mapping->host;
 921         if (!inode)
 922                 BUG();
 923         i_size = i_size_read(inode);
 924
 925         end_index = i_size >> PAGE_CACHE_SHIFT;
 926
 927         if(page->index < end_index)
 928                 nBytes = PAGE_CACHE_SIZE;
 929         else {
 930                 nBytes = i_size & (PAGE_CACHE_SIZE -1);
 931
 932                 if (page->index > end_index || !nBytes) {
 933                         T(YAFFS_TRACE_OS,
 934                                 ("yaffs_writepage at %08x, inode size = %08x!!!\n",
 935                                 (unsigned)(page->index << PAGE_CACHE_SHIFT),
 936                                 (unsigned)inode->i_size));
 937                         T(YAFFS_TRACE_OS,
 938                                 ("                -> don't care!!\n"));
 939
 940                         zero_user_segment(page,0,PAGE_CACHE_SIZE);
 941                         set_page_writeback(page);
 942                         unlock_page(page);
 943                         end_page_writeback(page);
 944                         return 0;
 945                 }
 946         }
 947
 948         if(nBytes != PAGE_CACHE_SIZE)
 949                 zero_user_segment(page,nBytes,PAGE_CACHE_SIZE);
 950
 951         get_page(page);
 952
 953         buffer = kmap(page);
 954
 955         obj = yaffs_InodeToObject(inode);
 956         yaffs_GrossLock(obj->myDev);
 957
 958         T(YAFFS_TRACE_OS,
 959                 ("yaffs_writepage at %08x, size %08x\n",
 960                 (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 961         T(YAFFS_TRACE_OS,
 962                 ("writepag0: obj = %05x, ino = %05x\n",
 963                 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 964
 965         nWritten = yaffs_WriteDataToFile(obj, buffer,
 966                         page->index << PAGE_CACHE_SHIFT, nBytes, 0);
 967
 968         T(YAFFS_TRACE_OS,
 969                 ("writepag1: obj = %05x, ino = %05x\n",
 970                 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 971
 972         yaffs_GrossUnlock(obj->myDev);
 973
 974         kunmap(page);
 975         set_page_writeback(page);
 976         unlock_page(page);
 977         end_page_writeback(page);
 978         put_page(page);
 979
 980         return (nWritten == nBytes) ? 0 : -ENOSPC;
 981 }
 982
 983
 984 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 985 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 986                                 loff_t pos, unsigned len, unsigned flags,
 987                                 struct page **pagep, void **fsdata)
 988 {
 989         struct page *pg = NULL;
 990         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
 991
 992         int ret = 0;
 993         int space_held = 0;
 994
 995         /* Get a page */
 996 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
 997         pg = grab_cache_page_write_begin(mapping, index, flags);
 998 #else
 999         pg = __grab_cache_page(mapping, index);
1000 #endif
1001
1002         *pagep = pg;
1003         if (!pg) {
1004                 ret =  -ENOMEM;
1005                 goto out;
1006         }
1007         T(YAFFS_TRACE_OS, ("start yaffs_write_begin index %d(%x) uptodate %d\n",(int)index,(int)index,Page_Uptodate(pg) ? 1 : 0));
1008
1009         /* Get fs space */
1010         space_held = yaffs_hold_space(filp);
1011
1012         if (!space_held) {
1013                 ret = -ENOSPC;
1014                 goto out;
1015         }
1016
1017         /* Update page if required */
1018
1019         if (!Page_Uptodate(pg))
1020                 ret = yaffs_readpage_nolock(filp, pg);
1021
1022         if (ret)
1023                 goto out;
1024
1025         /* Happy path return */
1026         T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
1027
1028         return 0;
1029
1030 out:
1031         T(YAFFS_TRACE_OS, ("end yaffs_write_begin fail returning %d\n", ret));
1032         if (space_held)
1033                 yaffs_release_space(filp);
1034         if (pg) {
1035                 unlock_page(pg);
1036                 page_cache_release(pg);
1037         }
1038         return ret;
1039 }
1040
1041 #else
1042
1043 static int yaffs_prepare_write(struct file *f, struct page *pg,
1044                                 unsigned offset, unsigned to)
1045 {
1046         T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n"));
1047
1048         if (!Page_Uptodate(pg))
1049                 return yaffs_readpage_nolock(f, pg);
1050         return 0;
1051 }
1052 #endif
1053
1054 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1055 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1056                                 loff_t pos, unsigned len, unsigned copied,
1057                                 struct page *pg, void *fsdadata)
1058 {
1059         int ret = 0;
1060         void *addr, *kva;
1061         uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1062
1063         kva = kmap(pg);
1064         addr = kva + offset_into_page;
1065
1066         T(YAFFS_TRACE_OS,
1067                 ("yaffs_write_end addr %p pos %x nBytes %d\n",
1068                 addr,(unsigned)pos, copied));
1069
1070         ret = yaffs_file_write(filp, addr, copied, &pos);
1071
1072         if (ret != copied) {
1073                 T(YAFFS_TRACE_OS,
1074                         ("yaffs_write_end not same size ret %d  copied %d\n",
1075                         ret, copied));
1076                 SetPageError(pg);
1077         } else {
1078                 /* Nothing */
1079         }
1080
1081         kunmap(pg);
1082
1083         yaffs_release_space(filp);
1084         unlock_page(pg);
1085         page_cache_release(pg);
1086         return ret;
1087 }
1088 #else
1089
1090 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
1091                                 unsigned to)
1092 {
1093         void *addr, *kva;
1094
1095         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
1096         int nBytes = to - offset;
1097         int nWritten;
1098
1099         unsigned spos = pos;
1100         unsigned saddr;
1101
1102         kva = kmap(pg);
1103         addr = kva + offset;
1104
1105         saddr = (unsigned) addr;
1106
1107         T(YAFFS_TRACE_OS,
1108                 ("yaffs_commit_write addr %x pos %x nBytes %d\n",
1109                 saddr, spos, nBytes));
1110
1111         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
1112
1113         if (nWritten != nBytes) {
1114                 T(YAFFS_TRACE_OS,
1115                         ("yaffs_commit_write not same size nWritten %d  nBytes %d\n",
1116                         nWritten, nBytes));
1117                 SetPageError(pg);
1118         } else {
1119                 /* Nothing */
1120         }
1121
1122         kunmap(pg);
1123
1124         T(YAFFS_TRACE_OS,
1125                 ("yaffs_commit_write returning %d\n",
1126                 nWritten == nBytes ? 0 : nWritten));
1127
1128         return nWritten == nBytes ? 0 : nWritten;
1129 }
1130 #endif
1131
1132
1133 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
1134 {
1135         if (inode && obj) {
1136
1137
1138                 /* Check mode against the variant type and attempt to repair if broken. */
1139                 __u32 mode = obj->yst_mode;
1140                 switch (obj->variantType) {
1141                 case YAFFS_OBJECT_TYPE_FILE:
1142                         if (!S_ISREG(mode)) {
1143                                 obj->yst_mode &= ~S_IFMT;
1144                                 obj->yst_mode |= S_IFREG;
1145                         }
1146
1147                         break;
1148                 case YAFFS_OBJECT_TYPE_SYMLINK:
1149                         if (!S_ISLNK(mode)) {
1150                                 obj->yst_mode &= ~S_IFMT;
1151                                 obj->yst_mode |= S_IFLNK;
1152                         }
1153
1154                         break;
1155                 case YAFFS_OBJECT_TYPE_DIRECTORY:
1156                         if (!S_ISDIR(mode)) {
1157                                 obj->yst_mode &= ~S_IFMT;
1158                                 obj->yst_mode |= S_IFDIR;
1159                         }
1160
1161                         break;
1162                 case YAFFS_OBJECT_TYPE_UNKNOWN:
1163                 case YAFFS_OBJECT_TYPE_HARDLINK:
1164                 case YAFFS_OBJECT_TYPE_SPECIAL:
1165                 default:
1166                         /* TODO? */
1167                         break;
1168                 }
1169
1170                 inode->i_flags |= S_NOATIME;
1171
1172                 inode->i_ino = obj->objectId;
1173                 inode->i_mode = obj->yst_mode;
1174                 inode->i_uid = obj->yst_uid;
1175                 inode->i_gid = obj->yst_gid;
1176 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
1177                 inode->i_blksize = inode->i_sb->s_blocksize;
1178 #endif
1179 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1180
1181                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1182                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1183                 inode->i_atime.tv_nsec = 0;
1184                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1185                 inode->i_mtime.tv_nsec = 0;
1186                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1187                 inode->i_ctime.tv_nsec = 0;
1188 #else
1189                 inode->i_rdev = obj->yst_rdev;
1190                 inode->i_atime = obj->yst_atime;
1191                 inode->i_mtime = obj->yst_mtime;
1192                 inode->i_ctime = obj->yst_ctime;
1193 #endif
1194                 inode->i_size = yaffs_GetObjectFileLength(obj);
1195                 inode->i_blocks = (inode->i_size + 511) >> 9;
1196
1197                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1198
1199                 T(YAFFS_TRACE_OS,
1200                         ("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
1201                         inode->i_mode, inode->i_uid, inode->i_gid,
1202                         (int)inode->i_size, atomic_read(&inode->i_count)));
1203
1204                 switch (obj->yst_mode & S_IFMT) {
1205                 default:        /* fifo, device or socket */
1206 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1207                         init_special_inode(inode, obj->yst_mode,
1208                                         old_decode_dev(obj->yst_rdev));
1209 #else
1210                         init_special_inode(inode, obj->yst_mode,
1211                                         (dev_t) (obj->yst_rdev));
1212 #endif
1213                         break;
1214                 case S_IFREG:   /* file */
1215                         inode->i_op = &yaffs_file_inode_operations;
1216                         inode->i_fop = &yaffs_file_operations;
1217                         inode->i_mapping->a_ops =
1218                                 &yaffs_file_address_operations;
1219                         break;
1220                 case S_IFDIR:   /* directory */
1221                         inode->i_op = &yaffs_dir_inode_operations;
1222                         inode->i_fop = &yaffs_dir_operations;
1223                         break;
1224                 case S_IFLNK:   /* symlink */
1225                         inode->i_op = &yaffs_symlink_inode_operations;
1226                         break;
1227                 }
1228
1229                 yaffs_InodeToObjectLV(inode) = obj;
1230
1231                 obj->myInode = inode;
1232
1233         } else {
1234                 T(YAFFS_TRACE_OS,
1235                         ("yaffs_FileInode invalid parameters\n"));
1236         }
1237
1238 }
1239
1240 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1241                                 yaffs_Object *obj)
1242 {
1243         struct inode *inode;
1244
1245         if (!sb) {
1246                 T(YAFFS_TRACE_OS,
1247                         ("yaffs_get_inode for NULL super_block!!\n"));
1248                 return NULL;
1249
1250         }
1251
1252         if (!obj) {
1253                 T(YAFFS_TRACE_OS,
1254                         ("yaffs_get_inode for NULL object!!\n"));
1255                 return NULL;
1256
1257         }
1258
1259         T(YAFFS_TRACE_OS,
1260                 ("yaffs_get_inode for object %d\n", obj->objectId));
1261
1262         inode = Y_IGET(sb, obj->objectId);
1263         if (IS_ERR(inode))
1264                 return NULL;
1265
1266         /* NB Side effect: iget calls back to yaffs_read_inode(). */
1267         /* iget also increments the inode's i_count */
1268         /* NB You can't be holding grossLock or deadlock will happen! */
1269
1270         return inode;
1271 }
1272
1273 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1274                                 loff_t *pos)
1275 {
1276         yaffs_Object *obj;
1277         int nWritten, ipos;
1278         struct inode *inode;
1279         yaffs_Device *dev;
1280
1281         obj = yaffs_DentryToObject(f->f_dentry);
1282
1283         dev = obj->myDev;
1284
1285         yaffs_GrossLock(dev);
1286
1287         inode = f->f_dentry->d_inode;
1288
1289         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1290                 ipos = inode->i_size;
1291         else
1292                 ipos = *pos;
1293
1294         if (!obj)
1295                 T(YAFFS_TRACE_OS,
1296                         ("yaffs_file_write: hey obj is null!\n"));
1297         else
1298                 T(YAFFS_TRACE_OS,
1299                         ("yaffs_file_write about to write writing %u(%x) bytes"
1300                         "to object %d at %d(%x)\n",
1301                         (unsigned) n, (unsigned) n, obj->objectId, ipos,ipos));
1302
1303         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
1304
1305         T(YAFFS_TRACE_OS,
1306                 ("yaffs_file_write: %d(%x) bytes written\n",
1307                 (unsigned )n,(unsigned)n));
1308
1309         if (nWritten > 0) {
1310                 ipos += nWritten;
1311                 *pos = ipos;
1312                 if (ipos > inode->i_size) {
1313                         inode->i_size = ipos;
1314                         inode->i_blocks = (ipos + 511) >> 9;
1315
1316                         T(YAFFS_TRACE_OS,
1317                                 ("yaffs_file_write size updated to %d bytes, "
1318                                 "%d blocks\n",
1319                                 ipos, (int)(inode->i_blocks)));
1320                 }
1321
1322         }
1323         yaffs_GrossUnlock(dev);
1324         return (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
1325 }
1326
1327 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1328 /* For now we just assume few parallel writes and check against a small number. */
1329 /* Todo: need to do this with a counter to handle parallel reads better */
1330
1331 static ssize_t yaffs_hold_space(struct file *f)
1332 {
1333         yaffs_Object *obj;
1334         yaffs_Device *dev;
1335
1336         int nFreeChunks;
1337
1338
1339         obj = yaffs_DentryToObject(f->f_dentry);
1340
1341         dev = obj->myDev;
1342
1343         yaffs_GrossLock(dev);
1344
1345         nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
1346
1347         yaffs_GrossUnlock(dev);
1348
1349         return (nFreeChunks > 20) ? 1 : 0;
1350 }
1351
1352 static void yaffs_release_space(struct file *f)
1353 {
1354         yaffs_Object *obj;
1355         yaffs_Device *dev;
1356
1357
1358         obj = yaffs_DentryToObject(f->f_dentry);
1359
1360         dev = obj->myDev;
1361
1362         yaffs_GrossLock(dev);
1363
1364
1365         yaffs_GrossUnlock(dev);
1366 }
1367
1368
1369 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
1370 {
1371         long long retval;
1372
1373         lock_kernel();
1374
1375         switch (origin){
1376         case 2:
1377                 offset += i_size_read(file->f_path.dentry->d_inode);
1378                 break;
1379         case 1:
1380                 offset += file->f_pos;
1381         }
1382         retval = -EINVAL;
1383
1384         if (offset >= 0){
1385                 if (offset != file->f_pos)
1386                         file->f_pos = offset;
1387
1388                 retval = offset;
1389         }
1390         unlock_kernel();
1391         return retval;
1392 }
1393
1394
1395 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1396 {
1397         yaffs_Object *obj;
1398         yaffs_Device *dev;
1399         struct yaffs_SearchContext *sc;
1400         struct inode *inode = f->f_dentry->d_inode;
1401         unsigned long offset, curoffs;
1402         yaffs_Object *l;
1403         int retVal = 0;
1404
1405         char name[YAFFS_MAX_NAME_LENGTH + 1];
1406
1407         obj = yaffs_DentryToObject(f->f_dentry);
1408         dev = obj->myDev;
1409
1410         yaffs_GrossLock(dev);
1411
1412         yaffs_DeviceToContext(dev)->readdirProcess = current;
1413
1414         offset = f->f_pos;
1415
1416         sc = yaffs_NewSearch(obj);
1417         if(!sc){
1418                 retVal = -ENOMEM;
1419                 goto unlock_out;
1420         }
1421
1422         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
1423
1424         if (offset == 0) {
1425                 T(YAFFS_TRACE_OS,
1426                         ("yaffs_readdir: entry . ino %d \n",
1427                         (int)inode->i_ino));
1428                 yaffs_GrossUnlock(dev);
1429                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
1430                         goto out;
1431                 yaffs_GrossLock(dev);
1432                 offset++;
1433                 f->f_pos++;
1434         }
1435         if (offset == 1) {
1436                 T(YAFFS_TRACE_OS,
1437                         ("yaffs_readdir: entry .. ino %d \n",
1438                         (int)f->f_dentry->d_parent->d_inode->i_ino));
1439                 yaffs_GrossUnlock(dev);
1440                 if (filldir(dirent, "..", 2, offset,
1441                         f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
1442                         goto out;
1443                 yaffs_GrossLock(dev);
1444                 offset++;
1445                 f->f_pos++;
1446         }
1447
1448         curoffs = 1;
1449
1450         /* If the directory has changed since the open or last call to
1451            readdir, rewind to after the 2 canned entries. */
1452         if (f->f_version != inode->i_version) {
1453                 offset = 2;
1454                 f->f_pos = offset;
1455                 f->f_version = inode->i_version;
1456         }
1457
1458         while(sc->nextReturn){
1459                 curoffs++;
1460                 l = sc->nextReturn;
1461                 if (curoffs >= offset) {
1462                         int this_inode = yaffs_GetObjectInode(l);
1463                         int this_type = yaffs_GetObjectType(l);
1464
1465                         yaffs_GetObjectName(l, name,
1466                                             YAFFS_MAX_NAME_LENGTH + 1);
1467                         T(YAFFS_TRACE_OS,
1468                           ("yaffs_readdir: %s inode %d\n", name,
1469                            yaffs_GetObjectInode(l)));
1470
1471                         yaffs_GrossUnlock(dev);
1472
1473                         if (filldir(dirent,
1474                                         name,
1475                                         strlen(name),
1476                                         offset,
1477                                         this_inode,
1478                                         this_type) < 0)
1479                                 goto out;
1480
1481                         yaffs_GrossLock(dev);
1482
1483                         offset++;
1484                         f->f_pos++;
1485                 }
1486                 yaffs_SearchAdvance(sc);
1487         }
1488
1489 unlock_out:
1490         yaffs_DeviceToContext(dev)->readdirProcess = NULL;
1491
1492         yaffs_GrossUnlock(dev);
1493 out:
1494         yaffs_EndSearch(sc);
1495
1496         return retVal;
1497 }
1498
1499
1500
1501 /*
1502  * File creation. Allocate an inode, and we're done..
1503  */
1504
1505 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1506 #define YCRED(x) x
1507 #else
1508 #define YCRED(x) (x->cred)
1509 #endif
1510
1511 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1512 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1513                         dev_t rdev)
1514 #else
1515 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1516                         int rdev)
1517 #endif
1518 {
1519         struct inode *inode;
1520
1521         yaffs_Object *obj = NULL;
1522         yaffs_Device *dev;
1523
1524         yaffs_Object *parent = yaffs_InodeToObject(dir);
1525
1526         int error = -ENOSPC;
1527         uid_t uid = YCRED(current)->fsuid;
1528         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1529
1530         if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1531                 mode |= S_ISGID;
1532
1533         if (parent) {
1534                 T(YAFFS_TRACE_OS,
1535                         ("yaffs_mknod: parent object %d type %d\n",
1536                         parent->objectId, parent->variantType));
1537         } else {
1538                 T(YAFFS_TRACE_OS,
1539                         ("yaffs_mknod: could not get parent object\n"));
1540                 return -EPERM;
1541         }
1542
1543         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1544                         "mode %x dev %x\n",
1545                         dentry->d_name.name, mode, rdev));
1546
1547         dev = parent->myDev;
1548
1549         yaffs_GrossLock(dev);
1550
1551         switch (mode & S_IFMT) {
1552         default:
1553                 /* Special (socket, fifo, device...) */
1554                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
1555 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1556                 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1557                                 gid, old_encode_dev(rdev));
1558 #else
1559                 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1560                                 gid, rdev);
1561 #endif
1562                 break;
1563         case S_IFREG:           /* file          */
1564                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
1565                 obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1566                                 gid);
1567                 break;
1568         case S_IFDIR:           /* directory */
1569                 T(YAFFS_TRACE_OS,
1570                         ("yaffs_mknod: making directory\n"));
1571                 obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1572                                         uid, gid);
1573                 break;
1574         case S_IFLNK:           /* symlink */
1575                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
1576                 obj = NULL;     /* Do we ever get here? */
1577                 break;
1578         }
1579
1580         /* Can not call yaffs_get_inode() with gross lock held */
1581         yaffs_GrossUnlock(dev);
1582
1583         if (obj) {
1584                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1585                 d_instantiate(dentry, inode);
1586                 update_dir_time(dir);
1587                 T(YAFFS_TRACE_OS,
1588                         ("yaffs_mknod created object %d count = %d\n",
1589                         obj->objectId, atomic_read(&inode->i_count)));
1590                 error = 0;
1591                 yaffs_FillInodeFromObject(dir,parent);
1592         } else {
1593                 T(YAFFS_TRACE_OS,
1594                         ("yaffs_mknod failed making object\n"));
1595                 error = -ENOMEM;
1596         }
1597
1598         return error;
1599 }
1600
1601 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1602 {
1603         int retVal;
1604         T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
1605         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1606         return retVal;
1607 }
1608
1609 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1610 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1611                         struct nameidata *n)
1612 #else
1613 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1614 #endif
1615 {
1616         T(YAFFS_TRACE_OS, ("yaffs_create\n"));
1617         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1618 }
1619
1620 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1621 {
1622         int retVal;
1623
1624         yaffs_Device *dev;
1625         yaffs_Object *obj;
1626
1627         T(YAFFS_TRACE_OS,
1628                 ("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1629                 dentry->d_name.name));
1630         obj = yaffs_InodeToObject(dir);
1631         dev = obj->myDev;
1632
1633         yaffs_GrossLock(dev);
1634
1635         retVal = yaffs_Unlink(obj, dentry->d_name.name);
1636
1637         if (retVal == YAFFS_OK) {
1638                 dentry->d_inode->i_nlink--;
1639                 dir->i_version++;
1640                 yaffs_GrossUnlock(dev);
1641                 mark_inode_dirty(dentry->d_inode);
1642                 update_dir_time(dir);
1643                 return 0;
1644         }
1645         yaffs_GrossUnlock(dev);
1646         return -ENOTEMPTY;
1647 }
1648
1649 /*
1650  * Create a link...
1651  */
1652 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1653                         struct dentry *dentry)
1654 {
1655         struct inode *inode = old_dentry->d_inode;
1656         yaffs_Object *obj = NULL;
1657         yaffs_Object *link = NULL;
1658         yaffs_Device *dev;
1659
1660         T(YAFFS_TRACE_OS, ("yaffs_link\n"));
1661
1662         obj = yaffs_InodeToObject(inode);
1663         dev = obj->myDev;
1664
1665         yaffs_GrossLock(dev);
1666
1667         if (!S_ISDIR(inode->i_mode))            /* Don't link directories */
1668                 link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1669                         obj);
1670
1671         if (link) {
1672                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1673                 d_instantiate(dentry, old_dentry->d_inode);
1674                 atomic_inc(&old_dentry->d_inode->i_count);
1675                 T(YAFFS_TRACE_OS,
1676                         ("yaffs_link link count %d i_count %d\n",
1677                         old_dentry->d_inode->i_nlink,
1678                         atomic_read(&old_dentry->d_inode->i_count)));
1679         }
1680
1681         yaffs_GrossUnlock(dev);
1682
1683         if (link){
1684                 update_dir_time(dir);
1685                 return 0;
1686         }
1687
1688         return -EPERM;
1689 }
1690
1691 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1692                                 const char *symname)
1693 {
1694         yaffs_Object *obj;
1695         yaffs_Device *dev;
1696         uid_t uid = YCRED(current)->fsuid;
1697         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1698
1699         T(YAFFS_TRACE_OS, ("yaffs_symlink\n"));
1700
1701         dev = yaffs_InodeToObject(dir)->myDev;
1702         yaffs_GrossLock(dev);
1703         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1704                                 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1705         yaffs_GrossUnlock(dev);
1706
1707         if (obj) {
1708                 struct inode *inode;
1709
1710                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1711                 d_instantiate(dentry, inode);
1712                 update_dir_time(dir);
1713                 T(YAFFS_TRACE_OS, ("symlink created OK\n"));
1714                 return 0;
1715         } else {
1716                 T(YAFFS_TRACE_OS, ("symlink not created\n"));
1717         }
1718
1719         return -ENOMEM;
1720 }
1721
1722 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1723                                 int datasync)
1724 {
1725
1726         yaffs_Object *obj;
1727         yaffs_Device *dev;
1728
1729         obj = yaffs_DentryToObject(dentry);
1730
1731         dev = obj->myDev;
1732
1733         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ("yaffs_sync_object\n"));
1734         yaffs_GrossLock(dev);
1735         yaffs_FlushFile(obj, 1, datasync);
1736         yaffs_GrossUnlock(dev);
1737         return 0;
1738 }
1739
1740 /*
1741  * The VFS layer already does all the dentry stuff for rename.
1742  *
1743  * NB: POSIX says you can rename an object over an old object of the same name
1744  */
1745 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1746                         struct inode *new_dir, struct dentry *new_dentry)
1747 {
1748         yaffs_Device *dev;
1749         int retVal = YAFFS_FAIL;
1750         yaffs_Object *target;
1751
1752         T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
1753         dev = yaffs_InodeToObject(old_dir)->myDev;
1754
1755         yaffs_GrossLock(dev);
1756
1757         /* Check if the target is an existing directory that is not empty. */
1758         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1759                                 new_dentry->d_name.name);
1760
1761
1762
1763         if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1764                 !ylist_empty(&target->variant.directoryVariant.children)) {
1765
1766                 T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
1767
1768                 retVal = YAFFS_FAIL;
1769         } else {
1770                 /* Now does unlinking internally using shadowing mechanism */
1771                 T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
1772
1773                 retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1774                                 old_dentry->d_name.name,
1775                                 yaffs_InodeToObject(new_dir),
1776                                 new_dentry->d_name.name);
1777         }
1778         yaffs_GrossUnlock(dev);
1779
1780         if (retVal == YAFFS_OK) {
1781                 if (target) {
1782                         new_dentry->d_inode->i_nlink--;
1783                         mark_inode_dirty(new_dentry->d_inode);
1784                 }
1785
1786                 update_dir_time(old_dir);
1787                 if(old_dir != new_dir)
1788                         update_dir_time(new_dir);
1789                 return 0;
1790         } else {
1791                 return -ENOTEMPTY;
1792         }
1793 }
1794
1795 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1796 {
1797         struct inode *inode = dentry->d_inode;
1798         int error = 0;
1799         yaffs_Device *dev;
1800
1801         T(YAFFS_TRACE_OS,
1802                 ("yaffs_setattr of object %d\n",
1803                 yaffs_InodeToObject(inode)->objectId));
1804
1805         /* Fail if a requested resize >= 2GB */
1806         if (attr->ia_valid & ATTR_SIZE &&
1807                 (attr->ia_size >> 31))
1808                 error = -EINVAL;
1809
1810         if (error == 0)
1811                 error = inode_change_ok(inode, attr);
1812         if (error == 0) {
1813                 int result;
1814                 if (!error){
1815                         error = inode_setattr(inode, attr);
1816                         T(YAFFS_TRACE_OS,("inode_setattr called\n"));
1817                         if (attr->ia_valid & ATTR_SIZE)
1818                                 truncate_inode_pages(&inode->i_data,attr->ia_size);
1819                 }
1820                 dev = yaffs_InodeToObject(inode)->myDev;
1821                 if (attr->ia_valid & ATTR_SIZE){
1822                         T(YAFFS_TRACE_OS,("resize to %d(%x)\n",(int)(attr->ia_size),(int)(attr->ia_size)));
1823                 }
1824                 yaffs_GrossLock(dev);
1825                 result = yaffs_SetAttributes(yaffs_InodeToObject(inode), attr);
1826                 if(result == YAFFS_OK) {
1827                         error = 0;
1828                 } else {
1829                         error = -EPERM;
1830                 }
1831                 yaffs_GrossUnlock(dev);
1832
1833         }
1834
1835         T(YAFFS_TRACE_OS,
1836                 ("yaffs_setattr done returning %d\n",error));
1837
1838         return error;
1839 }
1840
1841 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1842 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1843 {
1844         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1845         struct super_block *sb = dentry->d_sb;
1846 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1847 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1848 {
1849         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1850 #else
1851 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1852 {
1853         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1854 #endif
1855
1856         T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
1857
1858         yaffs_GrossLock(dev);
1859
1860         buf->f_type = YAFFS_MAGIC;
1861         buf->f_bsize = sb->s_blocksize;
1862         buf->f_namelen = 255;
1863
1864         if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
1865                 /* Do this if chunk size is not a power of 2 */
1866
1867                 uint64_t bytesInDev;
1868                 uint64_t bytesFree;
1869
1870                 bytesInDev = ((uint64_t)((dev->param.endBlock - dev->param.startBlock + 1))) *
1871                         ((uint64_t)(dev->param.nChunksPerBlock * dev->nDataBytesPerChunk));
1872
1873                 do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
1874                 buf->f_blocks = bytesInDev;
1875
1876                 bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
1877                         ((uint64_t)(dev->nDataBytesPerChunk));
1878
1879                 do_div(bytesFree, sb->s_blocksize);
1880
1881                 buf->f_bfree = bytesFree;
1882
1883         } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1884
1885                 buf->f_blocks =
1886                         (dev->param.endBlock - dev->param.startBlock + 1) *
1887                         dev->param.nChunksPerBlock /
1888                         (sb->s_blocksize / dev->nDataBytesPerChunk);
1889                 buf->f_bfree =
1890                         yaffs_GetNumberOfFreeChunks(dev) /
1891                         (sb->s_blocksize / dev->nDataBytesPerChunk);
1892         } else {
1893                 buf->f_blocks =
1894                         (dev->param.endBlock - dev->param.startBlock + 1) *
1895                         dev->param.nChunksPerBlock *
1896                         (dev->nDataBytesPerChunk / sb->s_blocksize);
1897
1898                 buf->f_bfree =
1899                         yaffs_GetNumberOfFreeChunks(dev) *
1900                         (dev->nDataBytesPerChunk / sb->s_blocksize);
1901         }
1902
1903         buf->f_files = 0;
1904         buf->f_ffree = 0;
1905         buf->f_bavail = buf->f_bfree;
1906
1907         yaffs_GrossUnlock(dev);
1908         return 0;
1909 }
1910
1911
1912
1913 static void yaffs_FlushInodes(struct super_block *sb)
1914 {
1915         struct inode *iptr;
1916         yaffs_Object *obj;
1917
1918         list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
1919                 obj = yaffs_InodeToObject(iptr);
1920                 if(obj){
1921                         T(YAFFS_TRACE_OS, ("flushing obj %d\n",obj->objectId));
1922                         yaffs_FlushFile(obj,1,0);
1923                 }
1924         }
1925 }
1926
1927
1928 static void yaffs_FlushSuperBlock(struct super_block *sb, int do_checkpoint)
1929 {
1930         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1931         if(!dev)
1932                 return;
1933
1934         yaffs_FlushInodes(sb);
1935         yaffs_UpdateDirtyDirectories(dev);
1936         yaffs_FlushEntireDeviceCache(dev);
1937         if(do_checkpoint)
1938                 yaffs_CheckpointSave(dev);
1939 }
1940
1941
1942 static unsigned yaffs_bg_gc_urgency(yaffs_Device *dev)
1943 {
1944         unsigned erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
1945         struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
1946         unsigned scatteredFree = 0; /* Free chunks not in an erased block */
1947
1948         if(erasedChunks < dev->nFreeChunks)
1949                 scatteredFree = (dev->nFreeChunks - erasedChunks);
1950
1951         if(!context->bgRunning)
1952                 return 0;
1953         else if(scatteredFree < (dev->param.nChunksPerBlock * 2))
1954                 return 0;
1955         else if(erasedChunks > dev->nFreeChunks/2)
1956                 return 0;
1957         else if(erasedChunks > dev->nFreeChunks/4)
1958                 return 1;
1959         else
1960                 return 2;
1961 }
1962
1963 static int yaffs_do_sync_fs(struct super_block *sb,
1964                                 int request_checkpoint)
1965 {
1966
1967         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1968         unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
1969         unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
1970         int do_checkpoint;
1971
1972         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1973                 ("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n",
1974                 gc_urgent,
1975                 sb->s_dirt ? "dirty" : "clean",
1976                 request_checkpoint ? "checkpoint requested" : "no checkpoint",
1977                 oneshot_checkpoint ? " one-shot" : "" ));
1978
1979         yaffs_GrossLock(dev);
1980         do_checkpoint = ((request_checkpoint && !gc_urgent) ||
1981                         oneshot_checkpoint) &&
1982                         !dev->isCheckpointed;
1983
1984         if (sb->s_dirt || do_checkpoint) {
1985                 yaffs_FlushSuperBlock(sb, !dev->isCheckpointed && do_checkpoint);
1986                 sb->s_dirt = 0;
1987                 if(oneshot_checkpoint)
1988                         yaffs_auto_checkpoint &= ~4;
1989         }
1990         yaffs_GrossUnlock(dev);
1991
1992         return 0;
1993 }
1994
1995 /*
1996  * yaffs background thread functions .
1997  * yaffs_BackgroundThread() the thread function
1998  * yaffs_BackgroundStart() launches the background thread.
1999  * yaffs_BackgroundStop() cleans up the background thread.
2000  *
2001  * NB:
2002  * The thread should only run after the yaffs is initialised
2003  * The thread should be stopped before yaffs is unmounted.
2004  * The thread should not do any writing while the fs is in read only.
2005  */
2006
2007 #ifdef YAFFS_COMPILE_BACKGROUND
2008
2009 void yaffs_background_waker(unsigned long data)
2010 {
2011         wake_up_process((struct task_struct *)data);
2012 }
2013
2014 static int yaffs_BackgroundThread(void *data)
2015 {
2016         yaffs_Device *dev = (yaffs_Device *)data;
2017         struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
2018         unsigned long now = jiffies;
2019         unsigned long next_dir_update = now;
2020         unsigned long next_gc = now;
2021         unsigned long expires;
2022         unsigned int urgency;
2023
2024         int gcResult;
2025         struct timer_list timer;
2026
2027         T(YAFFS_TRACE_BACKGROUND,
2028                 ("yaffs_background starting for dev %p\n",
2029                 (void *)dev));
2030
2031         set_freezable();
2032
2033         while(context->bgRunning){
2034                 T(YAFFS_TRACE_BACKGROUND,
2035                         ("yaffs_background\n"));
2036
2037                 if(kthread_should_stop())
2038                         break;
2039
2040                 if(try_to_freeze())
2041                         continue;
2042
2043                 yaffs_GrossLock(dev);
2044
2045                 now = jiffies;
2046
2047                 if(time_after(now, next_dir_update)){
2048                         yaffs_UpdateDirtyDirectories(dev);
2049                         next_dir_update = now + HZ;
2050                 }
2051
2052                 if(time_after(now,next_gc)){
2053                         if(!dev->isCheckpointed){
2054                                 urgency = yaffs_bg_gc_urgency(dev);
2055                                 gcResult = yaffs_BackgroundGarbageCollect(dev, urgency);
2056                                 if(urgency > 1)
2057                                         next_gc = now + HZ/20+1;
2058                                 else if(urgency > 0)
2059                                         next_gc = now + HZ/10+1;
2060                                 else
2061                                         next_gc = now + HZ * 2;
2062                         } else /*
2063                                 * gc not running so set to next_dir_update
2064                                 * to cut down on wake ups
2065                                 */
2066                                 next_gc = next_dir_update;
2067                 }
2068                 yaffs_GrossUnlock(dev);
2069 #if 1
2070                 expires = next_dir_update;
2071                 if (time_before(next_gc,expires))
2072                         expires = next_gc;
2073                 if(time_before(expires,now))
2074                         expires = now + HZ;
2075
2076                 init_timer(&timer);
2077                 timer.expires = expires+1;
2078                 timer.data = (unsigned long) current;
2079                 timer.function = yaffs_background_waker;
2080
2081                 set_current_state(TASK_INTERRUPTIBLE);
2082                 add_timer(&timer);
2083                 schedule();
2084                 del_timer_sync(&timer);
2085 #else
2086                 msleep(10);
2087 #endif
2088         }
2089
2090         return 0;
2091 }
2092
2093 static int yaffs_BackgroundStart(yaffs_Device *dev)
2094 {
2095         int retval = 0;
2096         struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
2097
2098         context->bgRunning = 1;
2099
2100         context->bgThread = kthread_run(yaffs_BackgroundThread,
2101                                 (void *)dev,"yaffs-bg");
2102
2103         if(IS_ERR(context->bgThread)){
2104                 retval = PTR_ERR(context->bgThread);
2105                 context->bgThread = NULL;
2106                 context->bgRunning = 0;
2107         }
2108         return retval;
2109 }
2110
2111 static void yaffs_BackgroundStop(yaffs_Device *dev)
2112 {
2113         struct yaffs_LinuxContext *ctxt = yaffs_DeviceToContext(dev);
2114
2115         ctxt->bgRunning = 0;
2116
2117         if( ctxt->bgThread){
2118                 kthread_stop(ctxt->bgThread);
2119                 ctxt->bgThread = NULL;
2120         }
2121 }
2122 #else
2123 static int yaffs_BackgroundThread(void *data)
2124 {
2125         return 0;
2126 }
2127
2128 static int yaffs_BackgroundStart(yaffs_Device *dev)
2129 {
2130         return 0;
2131 }
2132
2133 static void yaffs_BackgroundStop(yaffs_Device *dev)
2134 {
2135 }
2136 #endif
2137
2138
2139 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2140 static void yaffs_write_super(struct super_block *sb)
2141 #else
2142 static int yaffs_write_super(struct super_block *sb)
2143 #endif
2144 {
2145         unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2146
2147         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2148                 ("yaffs_write_super%s\n",
2149                 request_checkpoint ? " checkpt" : ""));
2150
2151         yaffs_do_sync_fs(sb, request_checkpoint);
2152
2153 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
2154         return 0;
2155 #endif
2156 }
2157
2158
2159 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2160 static int yaffs_sync_fs(struct super_block *sb, int wait)
2161 #else
2162 static int yaffs_sync_fs(struct super_block *sb)
2163 #endif
2164 {
2165         unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2166
2167         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2168                 ("yaffs_sync_fs%s\n",
2169                 request_checkpoint ? " checkpt" : ""));
2170
2171         yaffs_do_sync_fs(sb, request_checkpoint);
2172
2173         return 0;
2174 }
2175
2176 #ifdef YAFFS_USE_OWN_IGET
2177
2178 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
2179 {
2180         struct inode *inode;
2181         yaffs_Object *obj;
2182         yaffs_Device *dev = yaffs_SuperToDevice(sb);
2183
2184         T(YAFFS_TRACE_OS,
2185                 ("yaffs_iget for %lu\n", ino));
2186
2187         inode = iget_locked(sb, ino);
2188         if (!inode)
2189                 return ERR_PTR(-ENOMEM);
2190         if (!(inode->i_state & I_NEW))
2191                 return inode;
2192
2193         /* NB This is called as a side effect of other functions, but
2194          * we had to release the lock to prevent deadlocks, so
2195          * need to lock again.
2196          */
2197
2198         yaffs_GrossLock(dev);
2199
2200         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
2201
2202         yaffs_FillInodeFromObject(inode, obj);
2203
2204         yaffs_GrossUnlock(dev);
2205
2206         unlock_new_inode(inode);
2207         return inode;
2208 }
2209
2210 #else
2211
2212 static void yaffs_read_inode(struct inode *inode)
2213 {
2214         /* NB This is called as a side effect of other functions, but
2215          * we had to release the lock to prevent deadlocks, so
2216          * need to lock again.
2217          */
2218
2219         yaffs_Object *obj;
2220         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
2221
2222         T(YAFFS_TRACE_OS,
2223                 ("yaffs_read_inode for %d\n", (int)inode->i_ino));
2224
2225         if(current != yaffs_DeviceToContext(dev)->readdirProcess)
2226                 yaffs_GrossLock(dev);
2227
2228         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
2229
2230         yaffs_FillInodeFromObject(inode, obj);
2231
2232         if(current != yaffs_DeviceToContext(dev)->readdirProcess)
2233                 yaffs_GrossUnlock(dev);
2234 }
2235
2236 #endif
2237
2238 static YLIST_HEAD(yaffs_context_list);
2239 struct semaphore yaffs_context_lock;
2240
2241 #if 0 /* not used */
2242 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
2243 {
2244         yaffs_Device    *dev = yaffs_SuperToDevice(sb);
2245
2246         if (*flags & MS_RDONLY) {
2247                 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
2248
2249                 T(YAFFS_TRACE_OS,
2250                         ("yaffs_remount_fs: %s: RO\n", dev->name));
2251
2252                 yaffs_GrossLock(dev);
2253
2254                 yaffs_FlushSuperBlock(sb,1);
2255
2256                 if (mtd->sync)
2257                         mtd->sync(mtd);
2258
2259                 yaffs_GrossUnlock(dev);
2260         } else {
2261                 T(YAFFS_TRACE_OS,
2262                         ("yaffs_remount_fs: %s: RW\n", dev->name));
2263         }
2264
2265         return 0;
2266 }
2267 #endif
2268
2269 static void yaffs_put_super(struct super_block *sb)
2270 {
2271         yaffs_Device *dev = yaffs_SuperToDevice(sb);
2272
2273         T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
2274
2275         T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, ("Shutting down yaffs background thread\n"));
2276         yaffs_BackgroundStop(dev);
2277         T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, ("yaffs background thread shut down\n"));
2278
2279         yaffs_GrossLock(dev);
2280
2281         yaffs_FlushSuperBlock(sb,1);
2282
2283         if (yaffs_DeviceToContext(dev)->putSuperFunc)
2284                 yaffs_DeviceToContext(dev)->putSuperFunc(sb);
2285
2286
2287         yaffs_Deinitialise(dev);
2288
2289         yaffs_GrossUnlock(dev);
2290
2291         down(&yaffs_context_lock);
2292         ylist_del_init(&(yaffs_DeviceToContext(dev)->contextList));
2293         up(&yaffs_context_lock);
2294
2295         if (yaffs_DeviceToContext(dev)->spareBuffer) {
2296                 YFREE(yaffs_DeviceToContext(dev)->spareBuffer);
2297                 yaffs_DeviceToContext(dev)->spareBuffer = NULL;
2298         }
2299
2300         kfree(dev);
2301 }
2302
2303
2304 static void yaffs_MTDPutSuper(struct super_block *sb)
2305 {
2306         struct mtd_info *mtd = yaffs_DeviceToContext(yaffs_SuperToDevice(sb))->mtd;
2307
2308         if (mtd->sync)
2309                 mtd->sync(mtd);
2310
2311         put_mtd_device(mtd);
2312 }
2313
2314
2315 static void yaffs_MarkSuperBlockDirty(yaffs_Device *dev)
2316 {
2317         struct super_block *sb = yaffs_DeviceToContext(dev)->superBlock;
2318
2319         T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb));
2320         if (sb)
2321                 sb->s_dirt = 1;
2322 }
2323
2324 typedef struct {
2325         int inband_tags;
2326         int skip_checkpoint_read;
2327         int skip_checkpoint_write;
2328         int no_cache;
2329         int tags_ecc_on;
2330         int tags_ecc_overridden;
2331         int lazy_loading_enabled;
2332         int lazy_loading_overridden;
2333         int empty_lost_and_found;
2334         int empty_lost_and_found_overridden;
2335 } yaffs_options;
2336
2337 #define MAX_OPT_LEN 30
2338 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
2339 {
2340         char cur_opt[MAX_OPT_LEN + 1];
2341         int p;
2342         int error = 0;
2343
2344         /* Parse through the options which is a comma seperated list */
2345
2346         while (options_str && *options_str && !error) {
2347                 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2348                 p = 0;
2349
2350                 while(*options_str == ',')
2351                         options_str++;
2352
2353                 while (*options_str && *options_str != ',') {
2354                         if (p < MAX_OPT_LEN) {
2355                                 cur_opt[p] = *options_str;
2356                                 p++;
2357                         }
2358                         options_str++;
2359                 }
2360
2361                 if (!strcmp(cur_opt, "inband-tags"))
2362                         options->inband_tags = 1;
2363                 else if (!strcmp(cur_opt, "tags-ecc-off")){
2364                         options->tags_ecc_on = 0;
2365                         options->tags_ecc_overridden=1;
2366                 } else if (!strcmp(cur_opt, "tags-ecc-on")){
2367                         options->tags_ecc_on = 1;
2368                         options->tags_ecc_overridden = 1;
2369                 } else if (!strcmp(cur_opt, "lazy-loading-off")){
2370                         options->lazy_loading_enabled = 0;
2371                         options->lazy_loading_overridden=1;
2372                 } else if (!strcmp(cur_opt, "lazy-loading-on")){
2373                         options->lazy_loading_enabled = 1;
2374                         options->lazy_loading_overridden = 1;
2375                 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")){
2376                         options->empty_lost_and_found = 0;
2377                         options->empty_lost_and_found_overridden=1;
2378                 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")){
2379                         options->empty_lost_and_found = 1;
2380                         options->empty_lost_and_found_overridden=1;
2381                 } else if (!strcmp(cur_opt, "no-cache"))
2382                         options->no_cache = 1;
2383                 else if (!strcmp(cur_opt, "no-checkpoint-read"))
2384                         options->skip_checkpoint_read = 1;
2385                 else if (!strcmp(cur_opt, "no-checkpoint-write"))
2386                         options->skip_checkpoint_write = 1;
2387                 else if (!strcmp(cur_opt, "no-checkpoint")) {
2388                         options->skip_checkpoint_read = 1;
2389                         options->skip_checkpoint_write = 1;
2390                 } else {
2391                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2392                                         cur_opt);
2393                         error = 1;
2394                 }
2395         }
2396
2397         return error;
2398 }
2399
2400 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
2401                                                 struct super_block *sb,
2402                                                 void *data, int silent)
2403 {
2404         int nBlocks;
2405         struct inode *inode = NULL;
2406         struct dentry *root;
2407         yaffs_Device *dev = 0;
2408         char devname_buf[BDEVNAME_SIZE + 1];
2409         struct mtd_info *mtd;
2410         int err;
2411         char *data_str = (char *)data;
2412         struct yaffs_LinuxContext *context = NULL;
2413         yaffs_DeviceParam *param;
2414
2415         yaffs_options options;
2416
2417         sb->s_magic = YAFFS_MAGIC;
2418         sb->s_op = &yaffs_super_ops;
2419         sb->s_flags |= MS_NOATIME;
2420
2421 #ifdef YAFFS_COMPILE_EXPORTFS
2422         sb->s_export_op = &yaffs_export_ops;
2423 #endif
2424
2425         if (!sb)
2426                 printk(KERN_INFO "yaffs: sb is NULL\n");
2427         else if (!sb->s_dev)
2428                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2429         else if (!yaffs_devname(sb, devname_buf))
2430                 printk(KERN_INFO "yaffs: devname is NULL\n");
2431         else
2432                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
2433                        sb->s_dev,
2434                        yaffs_devname(sb, devname_buf));
2435
2436         if (!data_str)
2437                 data_str = "";
2438
2439         printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2440
2441         memset(&options, 0, sizeof(options));
2442
2443         if (yaffs_parse_options(&options, data_str)) {
2444                 /* Option parsing failed */
2445                 return NULL;
2446         }
2447
2448
2449         sb->s_blocksize = PAGE_CACHE_SIZE;
2450         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2451         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
2452         T(YAFFS_TRACE_OS,
2453           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
2454
2455 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
2456         T(YAFFS_TRACE_OS,
2457           ("yaffs: Write verification disabled. All guarantees "
2458            "null and void\n"));
2459 #endif
2460
2461         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
2462                                "\"%s\"\n",
2463                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
2464                                yaffs_devname(sb, devname_buf)));
2465
2466         /* Check it's an mtd device..... */
2467         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2468                 return NULL;    /* This isn't an mtd device */
2469
2470         /* Get the device */
2471         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2472         if (!mtd) {
2473                 T(YAFFS_TRACE_ALWAYS,
2474                   ("yaffs: MTD device #%u doesn't appear to exist\n",
2475                    MINOR(sb->s_dev)));
2476                 return NULL;
2477         }
2478         /* Check it's NAND */
2479         if (mtd->type != MTD_NANDFLASH) {
2480                 T(YAFFS_TRACE_ALWAYS,
2481                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
2482                 return NULL;
2483         }
2484
2485         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
2486         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
2487         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
2488         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
2489         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
2490         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
2491         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
2492         T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
2493         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
2494         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
2495 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
2496         T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
2497 #else
2498         T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
2499 #endif
2500
2501 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2502
2503         if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
2504                 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
2505                 yaffsVersion = 2;
2506         }
2507
2508         /* Added NCB 26/5/2006 for completeness */
2509         if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
2510                 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
2511                 yaffsVersion = 1;
2512         }
2513
2514 #endif
2515
2516         if (yaffsVersion == 2) {
2517                 /* Check for version 2 style functions */
2518                 if (!mtd->erase ||
2519                     !mtd->block_isbad ||
2520                     !mtd->block_markbad ||
2521                     !mtd->read ||
2522                     !mtd->write ||
2523 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2524                     !mtd->read_oob || !mtd->write_oob) {
2525 #else
2526                     !mtd->write_ecc ||
2527                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2528 #endif
2529                         T(YAFFS_TRACE_ALWAYS,
2530                           ("yaffs: MTD device does not support required "
2531                            "functions\n"));;
2532                         return NULL;
2533                 }
2534
2535                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2536                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2537                     !options.inband_tags) {
2538                         T(YAFFS_TRACE_ALWAYS,
2539                           ("yaffs: MTD device does not have the "
2540                            "right page sizes\n"));
2541                         return NULL;
2542                 }
2543         } else {
2544                 /* Check for V1 style functions */
2545                 if (!mtd->erase ||
2546                     !mtd->read ||
2547                     !mtd->write ||
2548 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2549                     !mtd->read_oob || !mtd->write_oob) {
2550 #else
2551                     !mtd->write_ecc ||
2552                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2553 #endif
2554                         T(YAFFS_TRACE_ALWAYS,
2555                           ("yaffs: MTD device does not support required "
2556                            "functions\n"));;
2557                         return NULL;
2558                 }
2559
2560                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2561                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2562                         T(YAFFS_TRACE_ALWAYS,
2563                           ("yaffs: MTD device does not support have the "
2564                            "right page sizes\n"));
2565                         return NULL;
2566                 }
2567         }
2568
2569         /* OK, so if we got here, we have an MTD that's NAND and looks
2570          * like it has the right capabilities
2571          * Set the yaffs_Device up for mtd
2572          */
2573
2574         dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2575         context = kmalloc(sizeof(struct yaffs_LinuxContext),GFP_KERNEL);
2576
2577         if(!dev || !context ){
2578                 if(dev)
2579                         kfree(dev);
2580                 if(context)
2581                         kfree(context);
2582                 dev = NULL;
2583                 context = NULL;
2584         }
2585
2586         if (!dev) {
2587                 /* Deep shit could not allocate device structure */
2588                 T(YAFFS_TRACE_ALWAYS,
2589                   ("yaffs_read_super: Failed trying to allocate "
2590                    "yaffs_Device. \n"));
2591                 return NULL;
2592         }
2593         memset(dev, 0, sizeof(yaffs_Device));
2594         param = &(dev->param);
2595
2596         memset(context,0,sizeof(struct yaffs_LinuxContext));
2597         dev->context = context;
2598         YINIT_LIST_HEAD(&(context->contextList));
2599         context->dev = dev;
2600         context->superBlock = sb;
2601
2602
2603
2604 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2605         sb->s_fs_info = dev;
2606 #else
2607         sb->u.generic_sbp = dev;
2608 #endif
2609
2610         yaffs_DeviceToContext(dev)->mtd = mtd;
2611         param->name = mtd->name;
2612
2613         /* Set up the memory size parameters.... */
2614
2615         nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2616
2617         param->startBlock = 0;
2618         param->endBlock = nBlocks - 1;
2619         param->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
2620         param->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
2621         param->nReservedBlocks = 5;
2622         param->nShortOpCaches = (options.no_cache) ? 0 : 10;
2623         param->inbandTags = options.inband_tags;
2624
2625 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2626         param->disableLazyLoad = 1;
2627 #endif
2628         if(options.lazy_loading_overridden)
2629                 param->disableLazyLoad = !options.lazy_loading_enabled;
2630
2631 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2632         param->noTagsECC = 1;
2633 #endif
2634
2635 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2636 #else
2637         param->deferDirectoryUpdate = 1;
2638 #endif
2639
2640         if(options.tags_ecc_overridden)
2641                 param->noTagsECC = !options.tags_ecc_on;
2642
2643 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2644         param->emptyLostAndFound = 1;
2645 #endif
2646
2647 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2648         param->refreshPeriod = 0;
2649 #else
2650         param->refreshPeriod = 100;
2651 #endif
2652
2653         if(options.empty_lost_and_found_overridden)
2654                 param->emptyLostAndFound = options.empty_lost_and_found;
2655
2656         /* ... and the functions. */
2657         if (yaffsVersion == 2) {
2658                 param->writeChunkWithTagsToNAND =
2659                     nandmtd2_WriteChunkWithTagsToNAND;
2660                 param->readChunkWithTagsFromNAND =
2661                     nandmtd2_ReadChunkWithTagsFromNAND;
2662                 param->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
2663                 param->queryNANDBlock = nandmtd2_QueryNANDBlock;
2664                 yaffs_DeviceToContext(dev)->spareBuffer = YMALLOC(mtd->oobsize);
2665                 param->isYaffs2 = 1;
2666 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2667                 param->totalBytesPerChunk = mtd->writesize;
2668                 param->nChunksPerBlock = mtd->erasesize / mtd->writesize;
2669 #else
2670                 param->totalBytesPerChunk = mtd->oobblock;
2671                 param->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
2672 #endif
2673                 nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2674
2675                 param->startBlock = 0;
2676                 param->endBlock = nBlocks - 1;
2677         } else {
2678 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2679                 /* use the MTD interface in yaffs_mtdif1.c */
2680                 param->writeChunkWithTagsToNAND =
2681                         nandmtd1_WriteChunkWithTagsToNAND;
2682                 param->readChunkWithTagsFromNAND =
2683                         nandmtd1_ReadChunkWithTagsFromNAND;
2684                 param->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
2685                 param->queryNANDBlock = nandmtd1_QueryNANDBlock;
2686 #else
2687                 param->writeChunkToNAND = nandmtd_WriteChunkToNAND;
2688                 param->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
2689 #endif
2690                 param->isYaffs2 = 0;
2691         }
2692         /* ... and common functions */
2693         param->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
2694         param->initialiseNAND = nandmtd_InitialiseNAND;
2695
2696         yaffs_DeviceToContext(dev)->putSuperFunc = yaffs_MTDPutSuper;
2697
2698         param->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
2699         param->gcControl = yaffs_gc_control_callback;
2700
2701         yaffs_DeviceToContext(dev)->superBlock= sb;
2702
2703
2704 #ifndef CONFIG_YAFFS_DOES_ECC
2705         param->useNANDECC = 1;
2706 #endif
2707
2708 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2709         param->wideTnodesDisabled = 1;
2710 #endif
2711
2712         param->skipCheckpointRead = options.skip_checkpoint_read;
2713         param->skipCheckpointWrite = options.skip_checkpoint_write;
2714
2715         /* we assume this is protected by lock_kernel() in mount/umount */
2716         down(&yaffs_context_lock);
2717         ylist_add_tail(&(yaffs_DeviceToContext(dev)->contextList), &yaffs_context_list);
2718         up(&yaffs_context_lock);
2719
2720         /* Directory search handling...*/
2721         YINIT_LIST_HEAD(&(yaffs_DeviceToContext(dev)->searchContexts));
2722         param->removeObjectCallback = yaffs_RemoveObjectCallback;
2723
2724         init_MUTEX(&(yaffs_DeviceToContext(dev)->grossLock));
2725
2726         yaffs_GrossLock(dev);
2727
2728         err = yaffs_GutsInitialise(dev);
2729
2730         T(YAFFS_TRACE_OS,
2731           ("yaffs_read_super: guts initialised %s\n",
2732            (err == YAFFS_OK) ? "OK" : "FAILED"));
2733
2734         if(err == YAFFS_OK)
2735                 yaffs_BackgroundStart(dev);
2736
2737         if(!context->bgThread)
2738                 param->deferDirectoryUpdate = 0;
2739
2740
2741         /* Release lock before yaffs_get_inode() */
2742         yaffs_GrossUnlock(dev);
2743
2744         /* Create root inode */
2745         if (err == YAFFS_OK)
2746                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
2747                                         yaffs_Root(dev));
2748
2749         if (!inode)
2750                 return NULL;
2751
2752         inode->i_op = &yaffs_dir_inode_operations;
2753         inode->i_fop = &yaffs_dir_operations;
2754
2755         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
2756
2757         root = d_alloc_root(inode);
2758
2759         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
2760
2761         if (!root) {
2762                 iput(inode);
2763                 return NULL;
2764         }
2765         sb->s_root = root;
2766         sb->s_dirt = !dev->isCheckpointed;
2767         T(YAFFS_TRACE_ALWAYS,
2768           ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
2769
2770         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
2771         return sb;
2772 }
2773
2774
2775 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2776 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2777                                          int silent)
2778 {
2779         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2780 }
2781
2782 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2783 static int yaffs_read_super(struct file_system_type *fs,
2784                             int flags, const char *dev_name,
2785                             void *data, struct vfsmount *mnt)
2786 {
2787
2788         return get_sb_bdev(fs, flags, dev_name, data,
2789                            yaffs_internal_read_super_mtd, mnt);
2790 }
2791 #else
2792 static struct super_block *yaffs_read_super(struct file_system_type *fs,
2793                                             int flags, const char *dev_name,
2794                                             void *data)
2795 {
2796
2797         return get_sb_bdev(fs, flags, dev_name, data,
2798                            yaffs_internal_read_super_mtd);
2799 }
2800 #endif
2801
2802 static struct file_system_type yaffs_fs_type = {
2803         .owner = THIS_MODULE,
2804         .name = "yaffs",
2805         .get_sb = yaffs_read_super,
2806         .kill_sb = kill_block_super,
2807         .fs_flags = FS_REQUIRES_DEV,
2808 };
2809 #else
2810 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
2811                                             int silent)
2812 {
2813         return yaffs_internal_read_super(1, sb, data, silent);
2814 }
2815
2816 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
2817                       FS_REQUIRES_DEV);
2818 #endif
2819
2820
2821 #ifdef CONFIG_YAFFS_YAFFS2
2822
2823 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2824 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2825                                           int silent)
2826 {
2827         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2828 }
2829
2830 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2831 static int yaffs2_read_super(struct file_system_type *fs,
2832                         int flags, const char *dev_name, void *data,
2833                         struct vfsmount *mnt)
2834 {
2835         return get_sb_bdev(fs, flags, dev_name, data,
2836                         yaffs2_internal_read_super_mtd, mnt);
2837 }
2838 #else
2839 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
2840                                              int flags, const char *dev_name,
2841                                              void *data)
2842 {
2843
2844         return get_sb_bdev(fs, flags, dev_name, data,
2845                            yaffs2_internal_read_super_mtd);
2846 }
2847 #endif
2848
2849 static struct file_system_type yaffs2_fs_type = {
2850         .owner = THIS_MODULE,
2851         .name = "yaffs2",
2852         .get_sb = yaffs2_read_super,
2853         .kill_sb = kill_block_super,
2854         .fs_flags = FS_REQUIRES_DEV,
2855 };
2856 #else
2857 static struct super_block *yaffs2_read_super(struct super_block *sb,
2858                                              void *data, int silent)
2859 {
2860         return yaffs_internal_read_super(2, sb, data, silent);
2861 }
2862
2863 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
2864                       FS_REQUIRES_DEV);
2865 #endif
2866
2867 #endif                          /* CONFIG_YAFFS_YAFFS2 */
2868
2869 static struct proc_dir_entry *my_proc_entry;
2870 static struct proc_dir_entry *debug_proc_entry;
2871
2872 static char *yaffs_dump_dev_part0(char *buf, yaffs_Device * dev)
2873 {
2874         buf += sprintf(buf, "startBlock......... %d\n", dev->param.startBlock);
2875         buf += sprintf(buf, "endBlock........... %d\n", dev->param.endBlock);
2876         buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->param.totalBytesPerChunk);
2877         buf += sprintf(buf, "useNANDECC......... %d\n", dev->param.useNANDECC);
2878         buf += sprintf(buf, "noTagsECC.......... %d\n", dev->param.noTagsECC);
2879         buf += sprintf(buf, "isYaffs2........... %d\n", dev->param.isYaffs2);
2880         buf += sprintf(buf, "inbandTags......... %d\n", dev->param.inbandTags);
2881         buf += sprintf(buf, "emptyLostAndFound.. %d\n", dev->param.emptyLostAndFound);
2882         buf += sprintf(buf, "disableLazyLoad.... %d\n", dev->param.disableLazyLoad);
2883         buf += sprintf(buf, "refreshPeriod...... %d\n", dev->param.refreshPeriod);
2884         buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->param.nShortOpCaches);
2885         buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->param.nReservedBlocks);
2886
2887         buf += sprintf(buf, "\n");
2888
2889         return buf;
2890 }
2891
2892
2893 static char *yaffs_dump_dev_part1(char *buf, yaffs_Device * dev)
2894 {
2895         buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
2896         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
2897         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
2898         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
2899         buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2900         buf += sprintf(buf, "\n");
2901         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2902         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2903         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2904         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2905         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2906         buf += sprintf(buf, "\n");
2907         buf += sprintf(buf, "nPageWrites........ %u\n", dev->nPageWrites);
2908         buf += sprintf(buf, "nPageReads......... %u\n", dev->nPageReads);
2909         buf += sprintf(buf, "nBlockErasures..... %u\n", dev->nBlockErasures);
2910         buf += sprintf(buf, "nGCCopies.......... %u\n", dev->nGCCopies);
2911         buf += sprintf(buf, "allGCs............. %u\n", dev->allGCs);
2912         buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGCs);
2913         buf += sprintf(buf, "oldestDirtyGCs..... %u\n", dev->oldestDirtyGCs);
2914         buf += sprintf(buf, "backgroundGCs...... %u\n", dev->backgroundGCs);
2915         buf += sprintf(buf, "nRetriedWrites..... %u\n", dev->nRetriedWrites);
2916         buf += sprintf(buf, "nRetireBlocks...... %u\n", dev->nRetiredBlocks);
2917         buf += sprintf(buf, "eccFixed........... %u\n", dev->eccFixed);
2918         buf += sprintf(buf, "eccUnfixed......... %u\n", dev->eccUnfixed);
2919         buf += sprintf(buf, "tagsEccFixed....... %u\n", dev->tagsEccFixed);
2920         buf += sprintf(buf, "tagsEccUnfixed..... %u\n", dev->tagsEccUnfixed);
2921         buf += sprintf(buf, "cacheHits.......... %u\n", dev->cacheHits);
2922         buf += sprintf(buf, "nDeletedFiles...... %u\n", dev->nDeletedFiles);
2923         buf += sprintf(buf, "nUnlinkedFiles..... %u\n", dev->nUnlinkedFiles);
2924         buf += sprintf(buf, "refreshCount....... %u\n", dev->refreshCount);
2925         buf +=
2926             sprintf(buf, "nBackgroudDeletions %u\n", dev->nBackgroundDeletions);
2927
2928         return buf;
2929 }
2930
2931 static int yaffs_proc_read(char *page,
2932                            char **start,
2933                            off_t offset, int count, int *eof, void *data)
2934 {
2935         struct ylist_head *item;
2936         char *buf = page;
2937         int step = offset;
2938         int n = 0;
2939
2940         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2941          * We use 'offset' (*ppos) to indicate where we are in devList.
2942          * This also assumes the user has posted a read buffer large
2943          * enough to hold the complete output; but that's life in /proc.
2944          */
2945
2946         *(int *)start = 1;
2947
2948         /* Print header first */
2949         if (step == 0)
2950                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2951                                "\n%s\n%s\n", yaffs_fs_c_version,
2952                                yaffs_guts_c_version);
2953         else if (step == 1)
2954                 buf += sprintf(buf,"\n");
2955         else {
2956                 step-=2;
2957
2958                 down(&yaffs_context_lock);
2959
2960                 /* Locate and print the Nth entry.  Order N-squared but N is small. */
2961                 ylist_for_each(item, &yaffs_context_list) {
2962                         struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
2963                         yaffs_Device *dev = dc->dev;
2964
2965                         if (n < (step & ~1)) {
2966                                 n+=2;
2967                                 continue;
2968                         }
2969                         if((step & 1)==0){
2970                                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->param.name);
2971                                 buf = yaffs_dump_dev_part0(buf, dev);
2972                         } else
2973                                 buf = yaffs_dump_dev_part1(buf, dev);
2974
2975                         break;
2976                 }
2977                 up(&yaffs_context_lock);
2978         }
2979
2980         return buf - page < count ? buf - page : count;
2981 }
2982
2983 static int yaffs_debug_proc_read(char *page,
2984                                 char **start,
2985                                 off_t offset, int count, int *eof, void *data)
2986 {
2987         struct ylist_head *item;
2988         char *buf = page;
2989         int n = 0;
2990
2991         down(&yaffs_context_lock);
2992
2993         /* Locate and print the Nth entry.  Order N-squared but N is small. */
2994         ylist_for_each(item, &yaffs_context_list) {
2995                 struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
2996                 yaffs_Device *dev = dc->dev;
2997
2998                 int erasedChunks;
2999                 int nObjects;
3000                 int nTnodes;
3001
3002                 erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3003                 nObjects = dev->nObjectsCreated -dev->nFreeObjects;
3004                 nTnodes = dev->nTnodesCreated - dev->nFreeTnodes;
3005
3006
3007                 buf += sprintf(buf,"%d, %d, %d, %u, %u, %d, %d\n",
3008                                 n, dev->nFreeChunks, erasedChunks,
3009                                 dev->backgroundGCs, dev->oldestDirtyGCs,
3010                                 nObjects, nTnodes);
3011         }
3012         up(&yaffs_context_lock);
3013
3014
3015         return buf - page < count ? buf - page : count;
3016 }
3017
3018 /**
3019  * Set the verbosity of the warnings and error messages.
3020  *
3021  * Note that the names can only be a..z or _ with the current code.
3022  */
3023
3024 static struct {
3025         char *mask_name;
3026         unsigned mask_bitfield;
3027 } mask_flags[] = {
3028         {"allocate", YAFFS_TRACE_ALLOCATE},
3029         {"always", YAFFS_TRACE_ALWAYS},
3030         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
3031         {"buffers", YAFFS_TRACE_BUFFERS},
3032         {"bug", YAFFS_TRACE_BUG},
3033         {"checkpt", YAFFS_TRACE_CHECKPOINT},
3034         {"deletion", YAFFS_TRACE_DELETION},
3035         {"erase", YAFFS_TRACE_ERASE},
3036         {"error", YAFFS_TRACE_ERROR},
3037         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
3038         {"gc", YAFFS_TRACE_GC},
3039         {"mtd", YAFFS_TRACE_MTD},
3040         {"nandaccess", YAFFS_TRACE_NANDACCESS},
3041         {"os", YAFFS_TRACE_OS},
3042         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
3043         {"scan", YAFFS_TRACE_SCAN},
3044         {"tracing", YAFFS_TRACE_TRACING},
3045         {"sync", YAFFS_TRACE_SYNC},
3046
3047         {"background", YAFFS_TRACE_BACKGROUND},
3048
3049         {"verify", YAFFS_TRACE_VERIFY},
3050         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
3051         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
3052         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
3053
3054         {"write", YAFFS_TRACE_WRITE},
3055         {"all", 0xffffffff},
3056         {"none", 0},
3057         {NULL, 0},
3058 };
3059
3060 #define MAX_MASK_NAME_LENGTH 40
3061 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
3062                                          unsigned long count, void *data)
3063 {
3064         unsigned rg = 0, mask_bitfield;
3065         char *end;
3066         char *mask_name;
3067         const char *x;
3068         char substring[MAX_MASK_NAME_LENGTH + 1];
3069         int i;
3070         int done = 0;
3071         int add, len = 0;
3072         int pos = 0;
3073
3074         rg = yaffs_traceMask;
3075
3076         while (!done && (pos < count)) {
3077                 done = 1;
3078                 while ((pos < count) && isspace(buf[pos]))
3079                         pos++;
3080
3081                 switch (buf[pos]) {
3082                 case '+':
3083                 case '-':
3084                 case '=':
3085                         add = buf[pos];
3086                         pos++;
3087                         break;
3088
3089                 default:
3090                         add = ' ';
3091                         break;
3092                 }
3093                 mask_name = NULL;
3094
3095                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
3096
3097                 if (end > buf + pos) {
3098                         mask_name = "numeral";
3099                         len = end - (buf + pos);
3100                         pos += len;
3101                         done = 0;
3102                 } else {
3103                         for (x = buf + pos, i = 0;
3104                             (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
3105                             i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
3106                                 substring[i] = *x;
3107                         substring[i] = '\0';
3108
3109                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3110                                 if (strcmp(substring, mask_flags[i].mask_name) == 0) {
3111                                         mask_name = mask_flags[i].mask_name;
3112                                         mask_bitfield = mask_flags[i].mask_bitfield;
3113                                         done = 0;
3114                                         break;
3115                                 }
3116                         }
3117                 }
3118
3119                 if (mask_name != NULL) {
3120                         done = 0;
3121                         switch (add) {
3122                         case '-':
3123                                 rg &= ~mask_bitfield;
3124                                 break;
3125                         case '+':
3126                                 rg |= mask_bitfield;
3127                                 break;
3128                         case '=':
3129                                 rg = mask_bitfield;
3130                                 break;
3131                         default:
3132                                 rg |= mask_bitfield;
3133                                 break;
3134                         }
3135                 }
3136         }
3137
3138         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
3139
3140         printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
3141
3142         if (rg & YAFFS_TRACE_ALWAYS) {
3143                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3144                         char flag;
3145                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
3146                         printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
3147                 }
3148         }
3149
3150         return count;
3151 }
3152
3153
3154 static int yaffs_proc_write(struct file *file, const char *buf,
3155                                          unsigned long count, void *data)
3156 {
3157         return yaffs_proc_write_trace_options(file, buf, count, data);
3158 }
3159
3160 /* Stuff to handle installation of file systems */
3161 struct file_system_to_install {
3162         struct file_system_type *fst;
3163         int installed;
3164 };
3165
3166 static struct file_system_to_install fs_to_install[] = {
3167         {&yaffs_fs_type, 0},
3168         {&yaffs2_fs_type, 0},
3169         {NULL, 0}
3170 };
3171
3172 static int __init init_yaffs_fs(void)
3173 {
3174         int error = 0;
3175         struct file_system_to_install *fsinst;
3176
3177         T(YAFFS_TRACE_ALWAYS,
3178           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
3179
3180         init_MUTEX(&yaffs_context_lock);
3181
3182         /* Install the proc_fs entries */
3183         my_proc_entry = create_proc_entry("yaffs",
3184                                                S_IRUGO | S_IFREG,
3185                                                YPROC_ROOT);
3186
3187         if (my_proc_entry) {
3188                 my_proc_entry->write_proc = yaffs_proc_write;
3189                 my_proc_entry->read_proc = yaffs_proc_read;
3190                 my_proc_entry->data = NULL;
3191         } else
3192                 return -ENOMEM;
3193
3194         debug_proc_entry = create_proc_entry("yaffs_debug",
3195                                                S_IRUGO | S_IFREG,
3196                                                YPROC_ROOT);
3197
3198         if (debug_proc_entry) {
3199                 debug_proc_entry->write_proc = NULL;
3200                 debug_proc_entry->read_proc = yaffs_debug_proc_read;
3201                 debug_proc_entry->data = NULL;
3202         } else
3203                 return -ENOMEM;
3204
3205         /* Now add the file system entries */
3206
3207         fsinst = fs_to_install;
3208
3209         while (fsinst->fst && !error) {
3210                 error = register_filesystem(fsinst->fst);
3211                 if (!error)
3212                         fsinst->installed = 1;
3213                 fsinst++;
3214         }
3215
3216         /* Any errors? uninstall  */
3217         if (error) {
3218                 fsinst = fs_to_install;
3219
3220                 while (fsinst->fst) {
3221                         if (fsinst->installed) {
3222                                 unregister_filesystem(fsinst->fst);
3223                                 fsinst->installed = 0;
3224                         }
3225                         fsinst++;
3226                 }
3227         }
3228
3229         return error;
3230 }
3231
3232 static void __exit exit_yaffs_fs(void)
3233 {
3234
3235         struct file_system_to_install *fsinst;
3236
3237         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
3238                                " removing. \n"));
3239
3240         remove_proc_entry("yaffs", YPROC_ROOT);
3241         remove_proc_entry("yaffs_debug", YPROC_ROOT);
3242
3243         fsinst = fs_to_install;
3244
3245         while (fsinst->fst) {
3246                 if (fsinst->installed) {
3247                         unregister_filesystem(fsinst->fst);
3248                         fsinst->installed = 0;
3249                 }
3250                 fsinst++;
3251         }
3252 }
3253
3254 module_init(init_yaffs_fs)
3255 module_exit(exit_yaffs_fs)
3256
3257 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3258 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
3259 MODULE_LICENSE("GPL");