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 %x pos %x nBytes %d\n",
1068                 (unsigned) addr,
1069                 (int)pos, copied));
1070
1071         ret = yaffs_file_write(filp, addr, copied, &pos);
1072
1073         if (ret != copied) {
1074                 T(YAFFS_TRACE_OS,
1075                         ("yaffs_write_end not same size ret %d  copied %d\n",
1076                         ret, copied));
1077                 SetPageError(pg);
1078         } else {
1079                 /* Nothing */
1080         }
1081
1082         kunmap(pg);
1083
1084         yaffs_release_space(filp);
1085         unlock_page(pg);
1086         page_cache_release(pg);
1087         return ret;
1088 }
1089 #else
1090
1091 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
1092                                 unsigned to)
1093 {
1094         void *addr, *kva;
1095
1096         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
1097         int nBytes = to - offset;
1098         int nWritten;
1099
1100         unsigned spos = pos;
1101         unsigned saddr;
1102
1103         kva = kmap(pg);
1104         addr = kva + offset;
1105
1106         saddr = (unsigned) addr;
1107
1108         T(YAFFS_TRACE_OS,
1109                 ("yaffs_commit_write addr %x pos %x nBytes %d\n",
1110                 saddr, spos, nBytes));
1111
1112         nWritten = yaffs_file_write(f, addr, nBytes, &pos);
1113
1114         if (nWritten != nBytes) {
1115                 T(YAFFS_TRACE_OS,
1116                         ("yaffs_commit_write not same size nWritten %d  nBytes %d\n",
1117                         nWritten, nBytes));
1118                 SetPageError(pg);
1119         } else {
1120                 /* Nothing */
1121         }
1122
1123         kunmap(pg);
1124
1125         T(YAFFS_TRACE_OS,
1126                 ("yaffs_commit_write returning %d\n",
1127                 nWritten == nBytes ? 0 : nWritten));
1128
1129         return nWritten == nBytes ? 0 : nWritten;
1130 }
1131 #endif
1132
1133
1134 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
1135 {
1136         if (inode && obj) {
1137
1138
1139                 /* Check mode against the variant type and attempt to repair if broken. */
1140                 __u32 mode = obj->yst_mode;
1141                 switch (obj->variantType) {
1142                 case YAFFS_OBJECT_TYPE_FILE:
1143                         if (!S_ISREG(mode)) {
1144                                 obj->yst_mode &= ~S_IFMT;
1145                                 obj->yst_mode |= S_IFREG;
1146                         }
1147
1148                         break;
1149                 case YAFFS_OBJECT_TYPE_SYMLINK:
1150                         if (!S_ISLNK(mode)) {
1151                                 obj->yst_mode &= ~S_IFMT;
1152                                 obj->yst_mode |= S_IFLNK;
1153                         }
1154
1155                         break;
1156                 case YAFFS_OBJECT_TYPE_DIRECTORY:
1157                         if (!S_ISDIR(mode)) {
1158                                 obj->yst_mode &= ~S_IFMT;
1159                                 obj->yst_mode |= S_IFDIR;
1160                         }
1161
1162                         break;
1163                 case YAFFS_OBJECT_TYPE_UNKNOWN:
1164                 case YAFFS_OBJECT_TYPE_HARDLINK:
1165                 case YAFFS_OBJECT_TYPE_SPECIAL:
1166                 default:
1167                         /* TODO? */
1168                         break;
1169                 }
1170
1171                 inode->i_flags |= S_NOATIME;
1172
1173                 inode->i_ino = obj->objectId;
1174                 inode->i_mode = obj->yst_mode;
1175                 inode->i_uid = obj->yst_uid;
1176                 inode->i_gid = obj->yst_gid;
1177 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
1178                 inode->i_blksize = inode->i_sb->s_blocksize;
1179 #endif
1180 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1181
1182                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1183                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1184                 inode->i_atime.tv_nsec = 0;
1185                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1186                 inode->i_mtime.tv_nsec = 0;
1187                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1188                 inode->i_ctime.tv_nsec = 0;
1189 #else
1190                 inode->i_rdev = obj->yst_rdev;
1191                 inode->i_atime = obj->yst_atime;
1192                 inode->i_mtime = obj->yst_mtime;
1193                 inode->i_ctime = obj->yst_ctime;
1194 #endif
1195                 inode->i_size = yaffs_GetObjectFileLength(obj);
1196                 inode->i_blocks = (inode->i_size + 511) >> 9;
1197
1198                 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1199
1200                 T(YAFFS_TRACE_OS,
1201                         ("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
1202                         inode->i_mode, inode->i_uid, inode->i_gid,
1203                         (int)inode->i_size, atomic_read(&inode->i_count)));
1204
1205                 switch (obj->yst_mode & S_IFMT) {
1206                 default:        /* fifo, device or socket */
1207 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1208                         init_special_inode(inode, obj->yst_mode,
1209                                         old_decode_dev(obj->yst_rdev));
1210 #else
1211                         init_special_inode(inode, obj->yst_mode,
1212                                         (dev_t) (obj->yst_rdev));
1213 #endif
1214                         break;
1215                 case S_IFREG:   /* file */
1216                         inode->i_op = &yaffs_file_inode_operations;
1217                         inode->i_fop = &yaffs_file_operations;
1218                         inode->i_mapping->a_ops =
1219                                 &yaffs_file_address_operations;
1220                         break;
1221                 case S_IFDIR:   /* directory */
1222                         inode->i_op = &yaffs_dir_inode_operations;
1223                         inode->i_fop = &yaffs_dir_operations;
1224                         break;
1225                 case S_IFLNK:   /* symlink */
1226                         inode->i_op = &yaffs_symlink_inode_operations;
1227                         break;
1228                 }
1229
1230                 yaffs_InodeToObjectLV(inode) = obj;
1231
1232                 obj->myInode = inode;
1233
1234         } else {
1235                 T(YAFFS_TRACE_OS,
1236                         ("yaffs_FileInode invalid parameters\n"));
1237         }
1238
1239 }
1240
1241 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1242                                 yaffs_Object *obj)
1243 {
1244         struct inode *inode;
1245
1246         if (!sb) {
1247                 T(YAFFS_TRACE_OS,
1248                         ("yaffs_get_inode for NULL super_block!!\n"));
1249                 return NULL;
1250
1251         }
1252
1253         if (!obj) {
1254                 T(YAFFS_TRACE_OS,
1255                         ("yaffs_get_inode for NULL object!!\n"));
1256                 return NULL;
1257
1258         }
1259
1260         T(YAFFS_TRACE_OS,
1261                 ("yaffs_get_inode for object %d\n", obj->objectId));
1262
1263         inode = Y_IGET(sb, obj->objectId);
1264         if (IS_ERR(inode))
1265                 return NULL;
1266
1267         /* NB Side effect: iget calls back to yaffs_read_inode(). */
1268         /* iget also increments the inode's i_count */
1269         /* NB You can't be holding grossLock or deadlock will happen! */
1270
1271         return inode;
1272 }
1273
1274 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1275                                 loff_t *pos)
1276 {
1277         yaffs_Object *obj;
1278         int nWritten, ipos;
1279         struct inode *inode;
1280         yaffs_Device *dev;
1281
1282         obj = yaffs_DentryToObject(f->f_dentry);
1283
1284         dev = obj->myDev;
1285
1286         yaffs_GrossLock(dev);
1287
1288         inode = f->f_dentry->d_inode;
1289
1290         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1291                 ipos = inode->i_size;
1292         else
1293                 ipos = *pos;
1294
1295         if (!obj)
1296                 T(YAFFS_TRACE_OS,
1297                         ("yaffs_file_write: hey obj is null!\n"));
1298         else
1299                 T(YAFFS_TRACE_OS,
1300                         ("yaffs_file_write about to write writing %u(%x) bytes"
1301                         "to object %d at %d(%x)\n",
1302                         (unsigned) n, (unsigned) n, obj->objectId, ipos,ipos));
1303
1304         nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
1305
1306         T(YAFFS_TRACE_OS,
1307                 ("yaffs_file_write: %d(%x) bytes written\n",
1308                 (unsigned )n,(unsigned)n));
1309
1310         if (nWritten > 0) {
1311                 ipos += nWritten;
1312                 *pos = ipos;
1313                 if (ipos > inode->i_size) {
1314                         inode->i_size = ipos;
1315                         inode->i_blocks = (ipos + 511) >> 9;
1316
1317                         T(YAFFS_TRACE_OS,
1318                                 ("yaffs_file_write size updated to %d bytes, "
1319                                 "%d blocks\n",
1320                                 ipos, (int)(inode->i_blocks)));
1321                 }
1322
1323         }
1324         yaffs_GrossUnlock(dev);
1325         return (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
1326 }
1327
1328 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1329 /* For now we just assume few parallel writes and check against a small number. */
1330 /* Todo: need to do this with a counter to handle parallel reads better */
1331
1332 static ssize_t yaffs_hold_space(struct file *f)
1333 {
1334         yaffs_Object *obj;
1335         yaffs_Device *dev;
1336
1337         int nFreeChunks;
1338
1339
1340         obj = yaffs_DentryToObject(f->f_dentry);
1341
1342         dev = obj->myDev;
1343
1344         yaffs_GrossLock(dev);
1345
1346         nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
1347
1348         yaffs_GrossUnlock(dev);
1349
1350         return (nFreeChunks > 20) ? 1 : 0;
1351 }
1352
1353 static void yaffs_release_space(struct file *f)
1354 {
1355         yaffs_Object *obj;
1356         yaffs_Device *dev;
1357
1358
1359         obj = yaffs_DentryToObject(f->f_dentry);
1360
1361         dev = obj->myDev;
1362
1363         yaffs_GrossLock(dev);
1364
1365
1366         yaffs_GrossUnlock(dev);
1367 }
1368
1369
1370 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
1371 {
1372         long long retval;
1373
1374         lock_kernel();
1375
1376         switch (origin){
1377         case 2:
1378                 offset += i_size_read(file->f_path.dentry->d_inode);
1379                 break;
1380         case 1:
1381                 offset += file->f_pos;
1382         }
1383         retval = -EINVAL;
1384
1385         if (offset >= 0){
1386                 if (offset != file->f_pos)
1387                         file->f_pos = offset;
1388
1389                 retval = offset;
1390         }
1391         unlock_kernel();
1392         return retval;
1393 }
1394
1395
1396 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1397 {
1398         yaffs_Object *obj;
1399         yaffs_Device *dev;
1400         struct yaffs_SearchContext *sc;
1401         struct inode *inode = f->f_dentry->d_inode;
1402         unsigned long offset, curoffs;
1403         yaffs_Object *l;
1404         int retVal = 0;
1405
1406         char name[YAFFS_MAX_NAME_LENGTH + 1];
1407
1408         obj = yaffs_DentryToObject(f->f_dentry);
1409         dev = obj->myDev;
1410
1411         yaffs_GrossLock(dev);
1412
1413         yaffs_DeviceToContext(dev)->readdirProcess = current;
1414
1415         offset = f->f_pos;
1416
1417         sc = yaffs_NewSearch(obj);
1418         if(!sc){
1419                 retVal = -ENOMEM;
1420                 goto unlock_out;
1421         }
1422
1423         T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
1424
1425         if (offset == 0) {
1426                 T(YAFFS_TRACE_OS,
1427                         ("yaffs_readdir: entry . ino %d \n",
1428                         (int)inode->i_ino));
1429                 yaffs_GrossUnlock(dev);
1430                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
1431                         goto out;
1432                 yaffs_GrossLock(dev);
1433                 offset++;
1434                 f->f_pos++;
1435         }
1436         if (offset == 1) {
1437                 T(YAFFS_TRACE_OS,
1438                         ("yaffs_readdir: entry .. ino %d \n",
1439                         (int)f->f_dentry->d_parent->d_inode->i_ino));
1440                 yaffs_GrossUnlock(dev);
1441                 if (filldir(dirent, "..", 2, offset,
1442                         f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
1443                         goto out;
1444                 yaffs_GrossLock(dev);
1445                 offset++;
1446                 f->f_pos++;
1447         }
1448
1449         curoffs = 1;
1450
1451         /* If the directory has changed since the open or last call to
1452            readdir, rewind to after the 2 canned entries. */
1453         if (f->f_version != inode->i_version) {
1454                 offset = 2;
1455                 f->f_pos = offset;
1456                 f->f_version = inode->i_version;
1457         }
1458
1459         while(sc->nextReturn){
1460                 curoffs++;
1461                 l = sc->nextReturn;
1462                 if (curoffs >= offset) {
1463                         int this_inode = yaffs_GetObjectInode(l);
1464                         int this_type = yaffs_GetObjectType(l);
1465
1466                         yaffs_GetObjectName(l, name,
1467                                             YAFFS_MAX_NAME_LENGTH + 1);
1468                         T(YAFFS_TRACE_OS,
1469                           ("yaffs_readdir: %s inode %d\n", name,
1470                            yaffs_GetObjectInode(l)));
1471
1472                         yaffs_GrossUnlock(dev);
1473
1474                         if (filldir(dirent,
1475                                         name,
1476                                         strlen(name),
1477                                         offset,
1478                                         this_inode,
1479                                         this_type) < 0)
1480                                 goto out;
1481
1482                         yaffs_GrossLock(dev);
1483
1484                         offset++;
1485                         f->f_pos++;
1486                 }
1487                 yaffs_SearchAdvance(sc);
1488         }
1489
1490 unlock_out:
1491         yaffs_DeviceToContext(dev)->readdirProcess = NULL;
1492
1493         yaffs_GrossUnlock(dev);
1494 out:
1495         yaffs_EndSearch(sc);
1496
1497         return retVal;
1498 }
1499
1500
1501
1502 /*
1503  * File creation. Allocate an inode, and we're done..
1504  */
1505
1506 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1507 #define YCRED(x) x
1508 #else
1509 #define YCRED(x) (x->cred)
1510 #endif
1511
1512 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1513 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1514                         dev_t rdev)
1515 #else
1516 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1517                         int rdev)
1518 #endif
1519 {
1520         struct inode *inode;
1521
1522         yaffs_Object *obj = NULL;
1523         yaffs_Device *dev;
1524
1525         yaffs_Object *parent = yaffs_InodeToObject(dir);
1526
1527         int error = -ENOSPC;
1528         uid_t uid = YCRED(current)->fsuid;
1529         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1530
1531         if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1532                 mode |= S_ISGID;
1533
1534         if (parent) {
1535                 T(YAFFS_TRACE_OS,
1536                         ("yaffs_mknod: parent object %d type %d\n",
1537                         parent->objectId, parent->variantType));
1538         } else {
1539                 T(YAFFS_TRACE_OS,
1540                         ("yaffs_mknod: could not get parent object\n"));
1541                 return -EPERM;
1542         }
1543
1544         T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1545                         "mode %x dev %x\n",
1546                         dentry->d_name.name, mode, rdev));
1547
1548         dev = parent->myDev;
1549
1550         yaffs_GrossLock(dev);
1551
1552         switch (mode & S_IFMT) {
1553         default:
1554                 /* Special (socket, fifo, device...) */
1555                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
1556 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1557                 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1558                                 gid, old_encode_dev(rdev));
1559 #else
1560                 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1561                                 gid, rdev);
1562 #endif
1563                 break;
1564         case S_IFREG:           /* file          */
1565                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
1566                 obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1567                                 gid);
1568                 break;
1569         case S_IFDIR:           /* directory */
1570                 T(YAFFS_TRACE_OS,
1571                         ("yaffs_mknod: making directory\n"));
1572                 obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1573                                         uid, gid);
1574                 break;
1575         case S_IFLNK:           /* symlink */
1576                 T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
1577                 obj = NULL;     /* Do we ever get here? */
1578                 break;
1579         }
1580
1581         /* Can not call yaffs_get_inode() with gross lock held */
1582         yaffs_GrossUnlock(dev);
1583
1584         if (obj) {
1585                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1586                 d_instantiate(dentry, inode);
1587                 update_dir_time(dir);
1588                 T(YAFFS_TRACE_OS,
1589                         ("yaffs_mknod created object %d count = %d\n",
1590                         obj->objectId, atomic_read(&inode->i_count)));
1591                 error = 0;
1592                 yaffs_FillInodeFromObject(dir,parent);
1593         } else {
1594                 T(YAFFS_TRACE_OS,
1595                         ("yaffs_mknod failed making object\n"));
1596                 error = -ENOMEM;
1597         }
1598
1599         return error;
1600 }
1601
1602 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1603 {
1604         int retVal;
1605         T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
1606         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1607         return retVal;
1608 }
1609
1610 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1611 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1612                         struct nameidata *n)
1613 #else
1614 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1615 #endif
1616 {
1617         T(YAFFS_TRACE_OS, ("yaffs_create\n"));
1618         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1619 }
1620
1621 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1622 {
1623         int retVal;
1624
1625         yaffs_Device *dev;
1626         yaffs_Object *obj;
1627
1628         T(YAFFS_TRACE_OS,
1629                 ("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1630                 dentry->d_name.name));
1631         obj = yaffs_InodeToObject(dir);
1632         dev = obj->myDev;
1633
1634         yaffs_GrossLock(dev);
1635
1636         retVal = yaffs_Unlink(obj, dentry->d_name.name);
1637
1638         if (retVal == YAFFS_OK) {
1639                 dentry->d_inode->i_nlink--;
1640                 dir->i_version++;
1641                 yaffs_GrossUnlock(dev);
1642                 mark_inode_dirty(dentry->d_inode);
1643                 update_dir_time(dir);
1644                 return 0;
1645         }
1646         yaffs_GrossUnlock(dev);
1647         return -ENOTEMPTY;
1648 }
1649
1650 /*
1651  * Create a link...
1652  */
1653 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1654                         struct dentry *dentry)
1655 {
1656         struct inode *inode = old_dentry->d_inode;
1657         yaffs_Object *obj = NULL;
1658         yaffs_Object *link = NULL;
1659         yaffs_Device *dev;
1660
1661         T(YAFFS_TRACE_OS, ("yaffs_link\n"));
1662
1663         obj = yaffs_InodeToObject(inode);
1664         dev = obj->myDev;
1665
1666         yaffs_GrossLock(dev);
1667
1668         if (!S_ISDIR(inode->i_mode))            /* Don't link directories */
1669                 link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1670                         obj);
1671
1672         if (link) {
1673                 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1674                 d_instantiate(dentry, old_dentry->d_inode);
1675                 atomic_inc(&old_dentry->d_inode->i_count);
1676                 T(YAFFS_TRACE_OS,
1677                         ("yaffs_link link count %d i_count %d\n",
1678                         old_dentry->d_inode->i_nlink,
1679                         atomic_read(&old_dentry->d_inode->i_count)));
1680         }
1681
1682         yaffs_GrossUnlock(dev);
1683
1684         if (link){
1685                 update_dir_time(dir);
1686                 return 0;
1687         }
1688
1689         return -EPERM;
1690 }
1691
1692 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1693                                 const char *symname)
1694 {
1695         yaffs_Object *obj;
1696         yaffs_Device *dev;
1697         uid_t uid = YCRED(current)->fsuid;
1698         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1699
1700         T(YAFFS_TRACE_OS, ("yaffs_symlink\n"));
1701
1702         dev = yaffs_InodeToObject(dir)->myDev;
1703         yaffs_GrossLock(dev);
1704         obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1705                                 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1706         yaffs_GrossUnlock(dev);
1707
1708         if (obj) {
1709                 struct inode *inode;
1710
1711                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1712                 d_instantiate(dentry, inode);
1713                 update_dir_time(dir);
1714                 T(YAFFS_TRACE_OS, ("symlink created OK\n"));
1715                 return 0;
1716         } else {
1717                 T(YAFFS_TRACE_OS, ("symlink not created\n"));
1718         }
1719
1720         return -ENOMEM;
1721 }
1722
1723 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1724                                 int datasync)
1725 {
1726
1727         yaffs_Object *obj;
1728         yaffs_Device *dev;
1729
1730         obj = yaffs_DentryToObject(dentry);
1731
1732         dev = obj->myDev;
1733
1734         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ("yaffs_sync_object\n"));
1735         yaffs_GrossLock(dev);
1736         yaffs_FlushFile(obj, 1, datasync);
1737         yaffs_GrossUnlock(dev);
1738         return 0;
1739 }
1740
1741 /*
1742  * The VFS layer already does all the dentry stuff for rename.
1743  *
1744  * NB: POSIX says you can rename an object over an old object of the same name
1745  */
1746 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1747                         struct inode *new_dir, struct dentry *new_dentry)
1748 {
1749         yaffs_Device *dev;
1750         int retVal = YAFFS_FAIL;
1751         yaffs_Object *target;
1752
1753         T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
1754         dev = yaffs_InodeToObject(old_dir)->myDev;
1755
1756         yaffs_GrossLock(dev);
1757
1758         /* Check if the target is an existing directory that is not empty. */
1759         target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1760                                 new_dentry->d_name.name);
1761
1762
1763
1764         if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1765                 !ylist_empty(&target->variant.directoryVariant.children)) {
1766
1767                 T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
1768
1769                 retVal = YAFFS_FAIL;
1770         } else {
1771                 /* Now does unlinking internally using shadowing mechanism */
1772                 T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
1773
1774                 retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1775                                 old_dentry->d_name.name,
1776                                 yaffs_InodeToObject(new_dir),
1777                                 new_dentry->d_name.name);
1778         }
1779         yaffs_GrossUnlock(dev);
1780
1781         if (retVal == YAFFS_OK) {
1782                 if (target) {
1783                         new_dentry->d_inode->i_nlink--;
1784                         mark_inode_dirty(new_dentry->d_inode);
1785                 }
1786
1787                 update_dir_time(old_dir);
1788                 if(old_dir != new_dir)
1789                         update_dir_time(new_dir);
1790                 return 0;
1791         } else {
1792                 return -ENOTEMPTY;
1793         }
1794 }
1795
1796 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1797 {
1798         struct inode *inode = dentry->d_inode;
1799         int error = 0;
1800         yaffs_Device *dev;
1801
1802         T(YAFFS_TRACE_OS,
1803                 ("yaffs_setattr of object %d\n",
1804                 yaffs_InodeToObject(inode)->objectId));
1805
1806         /* Fail if a requested resize >= 2GB */
1807         if (attr->ia_valid & ATTR_SIZE &&
1808                 (attr->ia_size >> 31))
1809                 error = -EINVAL;
1810
1811         if (error == 0)
1812                 error = inode_change_ok(inode, attr);
1813         if (error == 0) {
1814                 int result;
1815                 if (!error){
1816                         error = inode_setattr(inode, attr);
1817                         T(YAFFS_TRACE_OS,("inode_setattr called\n"));
1818                         if (attr->ia_valid & ATTR_SIZE)
1819                                 truncate_inode_pages(&inode->i_data,attr->ia_size);
1820                 }
1821                 dev = yaffs_InodeToObject(inode)->myDev;
1822                 if (attr->ia_valid & ATTR_SIZE){
1823                         T(YAFFS_TRACE_OS,("resize to %d(%x)\n",(int)(attr->ia_size),(int)(attr->ia_size)));
1824                 }
1825                 yaffs_GrossLock(dev);
1826                 result = yaffs_SetAttributes(yaffs_InodeToObject(inode), attr);
1827                 if(result == YAFFS_OK) {
1828                         error = 0;
1829                 } else {
1830                         error = -EPERM;
1831                 }
1832                 yaffs_GrossUnlock(dev);
1833
1834         }
1835
1836         T(YAFFS_TRACE_OS,
1837                 ("yaffs_setattr done returning %d\n",error));
1838
1839         return error;
1840 }
1841
1842 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1843 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1844 {
1845         yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1846         struct super_block *sb = dentry->d_sb;
1847 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1848 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1849 {
1850         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1851 #else
1852 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1853 {
1854         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1855 #endif
1856
1857         T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
1858
1859         yaffs_GrossLock(dev);
1860
1861         buf->f_type = YAFFS_MAGIC;
1862         buf->f_bsize = sb->s_blocksize;
1863         buf->f_namelen = 255;
1864
1865         if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
1866                 /* Do this if chunk size is not a power of 2 */
1867
1868                 uint64_t bytesInDev;
1869                 uint64_t bytesFree;
1870
1871                 bytesInDev = ((uint64_t)((dev->param.endBlock - dev->param.startBlock + 1))) *
1872                         ((uint64_t)(dev->param.nChunksPerBlock * dev->nDataBytesPerChunk));
1873
1874                 do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
1875                 buf->f_blocks = bytesInDev;
1876
1877                 bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
1878                         ((uint64_t)(dev->nDataBytesPerChunk));
1879
1880                 do_div(bytesFree, sb->s_blocksize);
1881
1882                 buf->f_bfree = bytesFree;
1883
1884         } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1885
1886                 buf->f_blocks =
1887                         (dev->param.endBlock - dev->param.startBlock + 1) *
1888                         dev->param.nChunksPerBlock /
1889                         (sb->s_blocksize / dev->nDataBytesPerChunk);
1890                 buf->f_bfree =
1891                         yaffs_GetNumberOfFreeChunks(dev) /
1892                         (sb->s_blocksize / dev->nDataBytesPerChunk);
1893         } else {
1894                 buf->f_blocks =
1895                         (dev->param.endBlock - dev->param.startBlock + 1) *
1896                         dev->param.nChunksPerBlock *
1897                         (dev->nDataBytesPerChunk / sb->s_blocksize);
1898
1899                 buf->f_bfree =
1900                         yaffs_GetNumberOfFreeChunks(dev) *
1901                         (dev->nDataBytesPerChunk / sb->s_blocksize);
1902         }
1903
1904         buf->f_files = 0;
1905         buf->f_ffree = 0;
1906         buf->f_bavail = buf->f_bfree;
1907
1908         yaffs_GrossUnlock(dev);
1909         return 0;
1910 }
1911
1912
1913
1914 static void yaffs_FlushInodes(struct super_block *sb)
1915 {
1916         struct inode *iptr;
1917         yaffs_Object *obj;
1918
1919         list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
1920                 obj = yaffs_InodeToObject(iptr);
1921                 if(obj){
1922                         T(YAFFS_TRACE_OS, ("flushing obj %d\n",obj->objectId));
1923                         yaffs_FlushFile(obj,1,0);
1924                 }
1925         }
1926 }
1927
1928
1929 static void yaffs_FlushSuperBlock(struct super_block *sb, int do_checkpoint)
1930 {
1931         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1932         if(!dev)
1933                 return;
1934
1935         yaffs_FlushInodes(sb);
1936         yaffs_UpdateDirtyDirectories(dev);
1937         yaffs_FlushEntireDeviceCache(dev);
1938         if(do_checkpoint)
1939                 yaffs_CheckpointSave(dev);
1940 }
1941
1942
1943 static unsigned yaffs_bg_gc_urgency(yaffs_Device *dev)
1944 {
1945         unsigned erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
1946         struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
1947         unsigned scatteredFree = 0; /* Free chunks not in an erased block */
1948
1949         if(erasedChunks < dev->nFreeChunks)
1950                 scatteredFree = (dev->nFreeChunks - erasedChunks);
1951
1952         if(!context->bgRunning)
1953                 return 0;
1954         else if(scatteredFree < (dev->param.nChunksPerBlock * 2))
1955                 return 0;
1956         else if(erasedChunks > dev->nFreeChunks/2)
1957                 return 0;
1958         else if(erasedChunks > dev->nFreeChunks/4)
1959                 return 1;
1960         else
1961                 return 2;
1962 }
1963
1964 static int yaffs_do_sync_fs(struct super_block *sb,
1965                                 int request_checkpoint)
1966 {
1967
1968         yaffs_Device *dev = yaffs_SuperToDevice(sb);
1969         unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
1970         unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
1971         int do_checkpoint;
1972
1973         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1974                 ("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n",
1975                 gc_urgent,
1976                 sb->s_dirt ? "dirty" : "clean",
1977                 request_checkpoint ? "checkpoint requested" : "no checkpoint",
1978                 oneshot_checkpoint ? " one-shot" : "" ));
1979
1980         yaffs_GrossLock(dev);
1981         do_checkpoint = ((request_checkpoint && !gc_urgent) ||
1982                         oneshot_checkpoint) &&
1983                         !dev->isCheckpointed;
1984
1985         if (sb->s_dirt || do_checkpoint) {
1986                 yaffs_FlushSuperBlock(sb, !dev->isCheckpointed && do_checkpoint);
1987                 sb->s_dirt = 0;
1988                 if(oneshot_checkpoint)
1989                         yaffs_auto_checkpoint &= ~4;
1990         }
1991         yaffs_GrossUnlock(dev);
1992
1993         return 0;
1994 }
1995
1996 /*
1997  * yaffs background thread functions .
1998  * yaffs_BackgroundThread() the thread function
1999  * yaffs_BackgroundStart() launches the background thread.
2000  * yaffs_BackgroundStop() cleans up the background thread.
2001  *
2002  * NB:
2003  * The thread should only run after the yaffs is initialised
2004  * The thread should be stopped before yaffs is unmounted.
2005  * The thread should not do any writing while the fs is in read only.
2006  */
2007
2008 #ifdef YAFFS_COMPILE_BACKGROUND
2009
2010 void yaffs_background_waker(unsigned long data)
2011 {
2012         wake_up_process((struct task_struct *)data);
2013 }
2014
2015 static int yaffs_BackgroundThread(void *data)
2016 {
2017         yaffs_Device *dev = (yaffs_Device *)data;
2018         struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
2019         unsigned long now = jiffies;
2020         unsigned long next_dir_update = now;
2021         unsigned long next_gc = now;
2022         unsigned long expires;
2023         unsigned int urgency;
2024
2025         int gcResult;
2026         struct timer_list timer;
2027
2028         T(YAFFS_TRACE_BACKGROUND,
2029                 ("yaffs_background starting for dev %p\n",
2030                 (void *)dev));
2031
2032         set_freezable();
2033
2034         while(context->bgRunning){
2035                 T(YAFFS_TRACE_BACKGROUND,
2036                         ("yaffs_background\n"));
2037
2038                 if(kthread_should_stop())
2039                         break;
2040
2041                 if(try_to_freeze())
2042                         continue;
2043
2044                 yaffs_GrossLock(dev);
2045
2046                 now = jiffies;
2047
2048                 if(time_after(now, next_dir_update)){
2049                         yaffs_UpdateDirtyDirectories(dev);
2050                         next_dir_update = now + HZ;
2051                 }
2052
2053                 if(time_after(now,next_gc)){
2054                         if(!dev->isCheckpointed){
2055                                 urgency = yaffs_bg_gc_urgency(dev);
2056                                 gcResult = yaffs_BackgroundGarbageCollect(dev, urgency);
2057                                 if(urgency > 1)
2058                                         next_gc = now + HZ/20+1;
2059                                 else if(urgency > 0)
2060                                         next_gc = now + HZ/10+1;
2061                                 else
2062                                         next_gc = now + HZ * 2;
2063                         } else /*
2064                                 * gc not running so set to next_dir_update
2065                                 * to cut down on wake ups
2066                                 */
2067                                 next_gc = next_dir_update;
2068                 }
2069                 yaffs_GrossUnlock(dev);
2070 #if 1
2071                 expires = next_dir_update;
2072                 if (time_before(next_gc,expires))
2073                         expires = next_gc;
2074                 if(time_before(expires,now))
2075                         expires = now + HZ;
2076
2077                 init_timer(&timer);
2078                 timer.expires = expires+1;
2079                 timer.data = (unsigned long) current;
2080                 timer.function = yaffs_background_waker;
2081
2082                 set_current_state(TASK_INTERRUPTIBLE);
2083                 add_timer(&timer);
2084                 schedule();
2085                 del_timer_sync(&timer);
2086 #else
2087                 msleep(10);
2088 #endif
2089         }
2090
2091         return 0;
2092 }
2093
2094 static int yaffs_BackgroundStart(yaffs_Device *dev)
2095 {
2096         int retval = 0;
2097
2098         struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
2099
2100         context->bgRunning = 1;
2101
2102         context->bgThread = kthread_run(yaffs_BackgroundThread,(void *)dev,"yaffs_%x",(unsigned)dev);
2103
2104         if(IS_ERR(context->bgThread)){
2105                 retval = PTR_ERR(context->bgThread);
2106                 context->bgThread = NULL;
2107                 context->bgRunning = 0;
2108         }
2109         return retval;
2110 }
2111
2112 static void yaffs_BackgroundStop(yaffs_Device *dev)
2113 {
2114         struct yaffs_LinuxContext *ctxt = yaffs_DeviceToContext(dev);
2115
2116         ctxt->bgRunning = 0;
2117
2118         if( ctxt->bgThread){
2119                 kthread_stop(ctxt->bgThread);
2120                 ctxt->bgThread = NULL;
2121         }
2122 }
2123 #else
2124 static int yaffs_BackgroundThread(void *data)
2125 {
2126         return 0;
2127 }
2128
2129 static int yaffs_BackgroundStart(yaffs_Device *dev)
2130 {
2131         return 0;
2132 }
2133
2134 static void yaffs_BackgroundStop(yaffs_Device *dev)
2135 {
2136 }
2137 #endif
2138
2139
2140 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2141 static void yaffs_write_super(struct super_block *sb)
2142 #else
2143 static int yaffs_write_super(struct super_block *sb)
2144 #endif
2145 {
2146         unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2147
2148         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2149                 ("yaffs_write_super%s\n",
2150                 request_checkpoint ? " checkpt" : ""));
2151
2152         yaffs_do_sync_fs(sb, request_checkpoint);
2153
2154 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
2155         return 0;
2156 #endif
2157 }
2158
2159
2160 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2161 static int yaffs_sync_fs(struct super_block *sb, int wait)
2162 #else
2163 static int yaffs_sync_fs(struct super_block *sb)
2164 #endif
2165 {
2166         unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2167
2168         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2169                 ("yaffs_sync_fs%s\n",
2170                 request_checkpoint ? " checkpt" : ""));
2171
2172         yaffs_do_sync_fs(sb, request_checkpoint);
2173
2174         return 0;
2175 }
2176
2177 #ifdef YAFFS_USE_OWN_IGET
2178
2179 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
2180 {
2181         struct inode *inode;
2182         yaffs_Object *obj;
2183         yaffs_Device *dev = yaffs_SuperToDevice(sb);
2184
2185         T(YAFFS_TRACE_OS,
2186                 ("yaffs_iget for %lu\n", ino));
2187
2188         inode = iget_locked(sb, ino);
2189         if (!inode)
2190                 return ERR_PTR(-ENOMEM);
2191         if (!(inode->i_state & I_NEW))
2192                 return inode;
2193
2194         /* NB This is called as a side effect of other functions, but
2195          * we had to release the lock to prevent deadlocks, so
2196          * need to lock again.
2197          */
2198
2199         yaffs_GrossLock(dev);
2200
2201         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
2202
2203         yaffs_FillInodeFromObject(inode, obj);
2204
2205         yaffs_GrossUnlock(dev);
2206
2207         unlock_new_inode(inode);
2208         return inode;
2209 }
2210
2211 #else
2212
2213 static void yaffs_read_inode(struct inode *inode)
2214 {
2215         /* NB This is called as a side effect of other functions, but
2216          * we had to release the lock to prevent deadlocks, so
2217          * need to lock again.
2218          */
2219
2220         yaffs_Object *obj;
2221         yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
2222
2223         T(YAFFS_TRACE_OS,
2224                 ("yaffs_read_inode for %d\n", (int)inode->i_ino));
2225
2226         if(current != yaffs_DeviceToContext(dev)->readdirProcess)
2227                 yaffs_GrossLock(dev);
2228
2229         obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
2230
2231         yaffs_FillInodeFromObject(inode, obj);
2232
2233         if(current != yaffs_DeviceToContext(dev)->readdirProcess)
2234                 yaffs_GrossUnlock(dev);
2235 }
2236
2237 #endif
2238
2239 static YLIST_HEAD(yaffs_context_list);
2240 struct semaphore yaffs_context_lock;
2241
2242 #if 0 /* not used */
2243 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
2244 {
2245         yaffs_Device    *dev = yaffs_SuperToDevice(sb);
2246
2247         if (*flags & MS_RDONLY) {
2248                 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
2249
2250                 T(YAFFS_TRACE_OS,
2251                         ("yaffs_remount_fs: %s: RO\n", dev->name));
2252
2253                 yaffs_GrossLock(dev);
2254
2255                 yaffs_FlushSuperBlock(sb,1);
2256
2257                 if (mtd->sync)
2258                         mtd->sync(mtd);
2259
2260                 yaffs_GrossUnlock(dev);
2261         } else {
2262                 T(YAFFS_TRACE_OS,
2263                         ("yaffs_remount_fs: %s: RW\n", dev->name));
2264         }
2265
2266         return 0;
2267 }
2268 #endif
2269
2270 static void yaffs_put_super(struct super_block *sb)
2271 {
2272         yaffs_Device *dev = yaffs_SuperToDevice(sb);
2273
2274         T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
2275
2276         T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, ("Shutting down yaffs background thread\n"));
2277         yaffs_BackgroundStop(dev);
2278         T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, ("yaffs background thread shut down\n"));
2279
2280         yaffs_GrossLock(dev);
2281
2282         yaffs_FlushSuperBlock(sb,1);
2283
2284         if (yaffs_DeviceToContext(dev)->putSuperFunc)
2285                 yaffs_DeviceToContext(dev)->putSuperFunc(sb);
2286
2287
2288         yaffs_Deinitialise(dev);
2289
2290         yaffs_GrossUnlock(dev);
2291
2292         down(&yaffs_context_lock);
2293         ylist_del_init(&(yaffs_DeviceToContext(dev)->contextList));
2294         up(&yaffs_context_lock);
2295
2296         if (yaffs_DeviceToContext(dev)->spareBuffer) {
2297                 YFREE(yaffs_DeviceToContext(dev)->spareBuffer);
2298                 yaffs_DeviceToContext(dev)->spareBuffer = NULL;
2299         }
2300
2301         kfree(dev);
2302 }
2303
2304
2305 static void yaffs_MTDPutSuper(struct super_block *sb)
2306 {
2307         struct mtd_info *mtd = yaffs_DeviceToContext(yaffs_SuperToDevice(sb))->mtd;
2308
2309         if (mtd->sync)
2310                 mtd->sync(mtd);
2311
2312         put_mtd_device(mtd);
2313 }
2314
2315
2316 static void yaffs_MarkSuperBlockDirty(yaffs_Device *dev)
2317 {
2318         struct super_block *sb = yaffs_DeviceToContext(dev)->superBlock;
2319
2320         T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb));
2321         if (sb)
2322                 sb->s_dirt = 1;
2323 }
2324
2325 typedef struct {
2326         int inband_tags;
2327         int skip_checkpoint_read;
2328         int skip_checkpoint_write;
2329         int no_cache;
2330         int tags_ecc_on;
2331         int tags_ecc_overridden;
2332         int lazy_loading_enabled;
2333         int lazy_loading_overridden;
2334         int empty_lost_and_found;
2335         int empty_lost_and_found_overridden;
2336 } yaffs_options;
2337
2338 #define MAX_OPT_LEN 30
2339 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
2340 {
2341         char cur_opt[MAX_OPT_LEN + 1];
2342         int p;
2343         int error = 0;
2344
2345         /* Parse through the options which is a comma seperated list */
2346
2347         while (options_str && *options_str && !error) {
2348                 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2349                 p = 0;
2350
2351                 while(*options_str == ',')
2352                         options_str++;
2353
2354                 while (*options_str && *options_str != ',') {
2355                         if (p < MAX_OPT_LEN) {
2356                                 cur_opt[p] = *options_str;
2357                                 p++;
2358                         }
2359                         options_str++;
2360                 }
2361
2362                 if (!strcmp(cur_opt, "inband-tags"))
2363                         options->inband_tags = 1;
2364                 else if (!strcmp(cur_opt, "tags-ecc-off")){
2365                         options->tags_ecc_on = 0;
2366                         options->tags_ecc_overridden=1;
2367                 } else if (!strcmp(cur_opt, "tags-ecc-on")){
2368                         options->tags_ecc_on = 1;
2369                         options->tags_ecc_overridden = 1;
2370                 } else if (!strcmp(cur_opt, "lazy-loading-off")){
2371                         options->lazy_loading_enabled = 0;
2372                         options->lazy_loading_overridden=1;
2373                 } else if (!strcmp(cur_opt, "lazy-loading-on")){
2374                         options->lazy_loading_enabled = 1;
2375                         options->lazy_loading_overridden = 1;
2376                 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")){
2377                         options->empty_lost_and_found = 0;
2378                         options->empty_lost_and_found_overridden=1;
2379                 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")){
2380                         options->empty_lost_and_found = 1;
2381                         options->empty_lost_and_found_overridden=1;
2382                 } else if (!strcmp(cur_opt, "no-cache"))
2383                         options->no_cache = 1;
2384                 else if (!strcmp(cur_opt, "no-checkpoint-read"))
2385                         options->skip_checkpoint_read = 1;
2386                 else if (!strcmp(cur_opt, "no-checkpoint-write"))
2387                         options->skip_checkpoint_write = 1;
2388                 else if (!strcmp(cur_opt, "no-checkpoint")) {
2389                         options->skip_checkpoint_read = 1;
2390                         options->skip_checkpoint_write = 1;
2391                 } else {
2392                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2393                                         cur_opt);
2394                         error = 1;
2395                 }
2396         }
2397
2398         return error;
2399 }
2400
2401 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
2402                                                 struct super_block *sb,
2403                                                 void *data, int silent)
2404 {
2405         int nBlocks;
2406         struct inode *inode = NULL;
2407         struct dentry *root;
2408         yaffs_Device *dev = 0;
2409         char devname_buf[BDEVNAME_SIZE + 1];
2410         struct mtd_info *mtd;
2411         int err;
2412         char *data_str = (char *)data;
2413         struct yaffs_LinuxContext *context = NULL;
2414         yaffs_DeviceParam *param;
2415
2416         yaffs_options options;
2417
2418         sb->s_magic = YAFFS_MAGIC;
2419         sb->s_op = &yaffs_super_ops;
2420         sb->s_flags |= MS_NOATIME;
2421
2422 #ifdef YAFFS_COMPILE_EXPORTFS
2423         sb->s_export_op = &yaffs_export_ops;
2424 #endif
2425
2426         if (!sb)
2427                 printk(KERN_INFO "yaffs: sb is NULL\n");
2428         else if (!sb->s_dev)
2429                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2430         else if (!yaffs_devname(sb, devname_buf))
2431                 printk(KERN_INFO "yaffs: devname is NULL\n");
2432         else
2433                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
2434                        sb->s_dev,
2435                        yaffs_devname(sb, devname_buf));
2436
2437         if (!data_str)
2438                 data_str = "";
2439
2440         printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2441
2442         memset(&options, 0, sizeof(options));
2443
2444         if (yaffs_parse_options(&options, data_str)) {
2445                 /* Option parsing failed */
2446                 return NULL;
2447         }
2448
2449
2450         sb->s_blocksize = PAGE_CACHE_SIZE;
2451         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2452         T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
2453         T(YAFFS_TRACE_OS,
2454           ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
2455
2456 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
2457         T(YAFFS_TRACE_OS,
2458           ("yaffs: Write verification disabled. All guarantees "
2459            "null and void\n"));
2460 #endif
2461
2462         T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
2463                                "\"%s\"\n",
2464                                MAJOR(sb->s_dev), MINOR(sb->s_dev),
2465                                yaffs_devname(sb, devname_buf)));
2466
2467         /* Check it's an mtd device..... */
2468         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2469                 return NULL;    /* This isn't an mtd device */
2470
2471         /* Get the device */
2472         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2473         if (!mtd) {
2474                 T(YAFFS_TRACE_ALWAYS,
2475                   ("yaffs: MTD device #%u doesn't appear to exist\n",
2476                    MINOR(sb->s_dev)));
2477                 return NULL;
2478         }
2479         /* Check it's NAND */
2480         if (mtd->type != MTD_NANDFLASH) {
2481                 T(YAFFS_TRACE_ALWAYS,
2482                   ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
2483                 return NULL;
2484         }
2485
2486         T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
2487         T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
2488         T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
2489         T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
2490         T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
2491         T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
2492         T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
2493         T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
2494         T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
2495         T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
2496 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
2497         T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
2498 #else
2499         T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
2500 #endif
2501
2502 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2503
2504         if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
2505                 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
2506                 yaffsVersion = 2;
2507         }
2508
2509         /* Added NCB 26/5/2006 for completeness */
2510         if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
2511                 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
2512                 yaffsVersion = 1;
2513         }
2514
2515 #endif
2516
2517         if (yaffsVersion == 2) {
2518                 /* Check for version 2 style functions */
2519                 if (!mtd->erase ||
2520                     !mtd->block_isbad ||
2521                     !mtd->block_markbad ||
2522                     !mtd->read ||
2523                     !mtd->write ||
2524 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2525                     !mtd->read_oob || !mtd->write_oob) {
2526 #else
2527                     !mtd->write_ecc ||
2528                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2529 #endif
2530                         T(YAFFS_TRACE_ALWAYS,
2531                           ("yaffs: MTD device does not support required "
2532                            "functions\n"));;
2533                         return NULL;
2534                 }
2535
2536                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2537                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2538                     !options.inband_tags) {
2539                         T(YAFFS_TRACE_ALWAYS,
2540                           ("yaffs: MTD device does not have the "
2541                            "right page sizes\n"));
2542                         return NULL;
2543                 }
2544         } else {
2545                 /* Check for V1 style functions */
2546                 if (!mtd->erase ||
2547                     !mtd->read ||
2548                     !mtd->write ||
2549 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2550                     !mtd->read_oob || !mtd->write_oob) {
2551 #else
2552                     !mtd->write_ecc ||
2553                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2554 #endif
2555                         T(YAFFS_TRACE_ALWAYS,
2556                           ("yaffs: MTD device does not support required "
2557                            "functions\n"));;
2558                         return NULL;
2559                 }
2560
2561                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2562                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2563                         T(YAFFS_TRACE_ALWAYS,
2564                           ("yaffs: MTD device does not support have the "
2565                            "right page sizes\n"));
2566                         return NULL;
2567                 }
2568         }
2569
2570         /* OK, so if we got here, we have an MTD that's NAND and looks
2571          * like it has the right capabilities
2572          * Set the yaffs_Device up for mtd
2573          */
2574
2575         dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2576         context = kmalloc(sizeof(struct yaffs_LinuxContext),GFP_KERNEL);
2577
2578         if(!dev || !context ){
2579                 if(dev)
2580                         kfree(dev);
2581                 if(context)
2582                         kfree(context);
2583                 dev = NULL;
2584                 context = NULL;
2585         }
2586
2587         if (!dev) {
2588                 /* Deep shit could not allocate device structure */
2589                 T(YAFFS_TRACE_ALWAYS,
2590                   ("yaffs_read_super: Failed trying to allocate "
2591                    "yaffs_Device. \n"));
2592                 return NULL;
2593         }
2594         memset(dev, 0, sizeof(yaffs_Device));
2595         param = &(dev->param);
2596
2597         memset(context,0,sizeof(struct yaffs_LinuxContext));
2598         dev->context = context;
2599         YINIT_LIST_HEAD(&(context->contextList));
2600         context->dev = dev;
2601         context->superBlock = sb;
2602
2603
2604
2605 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2606         sb->s_fs_info = dev;
2607 #else
2608         sb->u.generic_sbp = dev;
2609 #endif
2610
2611         yaffs_DeviceToContext(dev)->mtd = mtd;
2612         param->name = mtd->name;
2613
2614         /* Set up the memory size parameters.... */
2615
2616         nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2617
2618         param->startBlock = 0;
2619         param->endBlock = nBlocks - 1;
2620         param->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
2621         param->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
2622         param->nReservedBlocks = 5;
2623         param->nShortOpCaches = (options.no_cache) ? 0 : 10;
2624         param->inbandTags = options.inband_tags;
2625
2626 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2627         param->disableLazyLoad = 1;
2628 #endif
2629         if(options.lazy_loading_overridden)
2630                 param->disableLazyLoad = !options.lazy_loading_enabled;
2631
2632 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2633         param->noTagsECC = 1;
2634 #endif
2635
2636 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2637 #else
2638         param->deferDirectoryUpdate = 1;
2639 #endif
2640
2641         if(options.tags_ecc_overridden)
2642                 param->noTagsECC = !options.tags_ecc_on;
2643
2644 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2645         param->emptyLostAndFound = 1;
2646 #endif
2647
2648 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2649         param->refreshPeriod = 0;
2650 #else
2651         param->refreshPeriod = 100;
2652 #endif
2653
2654         if(options.empty_lost_and_found_overridden)
2655                 param->emptyLostAndFound = options.empty_lost_and_found;
2656
2657         /* ... and the functions. */
2658         if (yaffsVersion == 2) {
2659                 param->writeChunkWithTagsToNAND =
2660                     nandmtd2_WriteChunkWithTagsToNAND;
2661                 param->readChunkWithTagsFromNAND =
2662                     nandmtd2_ReadChunkWithTagsFromNAND;
2663                 param->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
2664                 param->queryNANDBlock = nandmtd2_QueryNANDBlock;
2665                 yaffs_DeviceToContext(dev)->spareBuffer = YMALLOC(mtd->oobsize);
2666                 param->isYaffs2 = 1;
2667 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2668                 param->totalBytesPerChunk = mtd->writesize;
2669                 param->nChunksPerBlock = mtd->erasesize / mtd->writesize;
2670 #else
2671                 param->totalBytesPerChunk = mtd->oobblock;
2672                 param->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
2673 #endif
2674                 nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2675
2676                 param->startBlock = 0;
2677                 param->endBlock = nBlocks - 1;
2678         } else {
2679 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2680                 /* use the MTD interface in yaffs_mtdif1.c */
2681                 param->writeChunkWithTagsToNAND =
2682                         nandmtd1_WriteChunkWithTagsToNAND;
2683                 param->readChunkWithTagsFromNAND =
2684                         nandmtd1_ReadChunkWithTagsFromNAND;
2685                 param->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
2686                 param->queryNANDBlock = nandmtd1_QueryNANDBlock;
2687 #else
2688                 param->writeChunkToNAND = nandmtd_WriteChunkToNAND;
2689                 param->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
2690 #endif
2691                 param->isYaffs2 = 0;
2692         }
2693         /* ... and common functions */
2694         param->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
2695         param->initialiseNAND = nandmtd_InitialiseNAND;
2696
2697         yaffs_DeviceToContext(dev)->putSuperFunc = yaffs_MTDPutSuper;
2698
2699         param->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
2700         param->gcControl = yaffs_gc_control_callback;
2701
2702         yaffs_DeviceToContext(dev)->superBlock= sb;
2703
2704
2705 #ifndef CONFIG_YAFFS_DOES_ECC
2706         param->useNANDECC = 1;
2707 #endif
2708
2709 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2710         param->wideTnodesDisabled = 1;
2711 #endif
2712
2713         param->skipCheckpointRead = options.skip_checkpoint_read;
2714         param->skipCheckpointWrite = options.skip_checkpoint_write;
2715
2716         /* we assume this is protected by lock_kernel() in mount/umount */
2717         down(&yaffs_context_lock);
2718         ylist_add_tail(&(yaffs_DeviceToContext(dev)->contextList), &yaffs_context_list);
2719         up(&yaffs_context_lock);
2720
2721         /* Directory search handling...*/
2722         YINIT_LIST_HEAD(&(yaffs_DeviceToContext(dev)->searchContexts));
2723         param->removeObjectCallback = yaffs_RemoveObjectCallback;
2724
2725         init_MUTEX(&(yaffs_DeviceToContext(dev)->grossLock));
2726
2727         yaffs_GrossLock(dev);
2728
2729         err = yaffs_GutsInitialise(dev);
2730
2731         T(YAFFS_TRACE_OS,
2732           ("yaffs_read_super: guts initialised %s\n",
2733            (err == YAFFS_OK) ? "OK" : "FAILED"));
2734
2735         if(err == YAFFS_OK)
2736                 yaffs_BackgroundStart(dev);
2737
2738         if(!context->bgThread)
2739                 param->deferDirectoryUpdate = 0;
2740
2741
2742         /* Release lock before yaffs_get_inode() */
2743         yaffs_GrossUnlock(dev);
2744
2745         /* Create root inode */
2746         if (err == YAFFS_OK)
2747                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
2748                                         yaffs_Root(dev));
2749
2750         if (!inode)
2751                 return NULL;
2752
2753         inode->i_op = &yaffs_dir_inode_operations;
2754         inode->i_fop = &yaffs_dir_operations;
2755
2756         T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
2757
2758         root = d_alloc_root(inode);
2759
2760         T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
2761
2762         if (!root) {
2763                 iput(inode);
2764                 return NULL;
2765         }
2766         sb->s_root = root;
2767         sb->s_dirt = !dev->isCheckpointed;
2768         T(YAFFS_TRACE_ALWAYS,
2769           ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
2770
2771         T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
2772         return sb;
2773 }
2774
2775
2776 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2777 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2778                                          int silent)
2779 {
2780         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2781 }
2782
2783 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2784 static int yaffs_read_super(struct file_system_type *fs,
2785                             int flags, const char *dev_name,
2786                             void *data, struct vfsmount *mnt)
2787 {
2788
2789         return get_sb_bdev(fs, flags, dev_name, data,
2790                            yaffs_internal_read_super_mtd, mnt);
2791 }
2792 #else
2793 static struct super_block *yaffs_read_super(struct file_system_type *fs,
2794                                             int flags, const char *dev_name,
2795                                             void *data)
2796 {
2797
2798         return get_sb_bdev(fs, flags, dev_name, data,
2799                            yaffs_internal_read_super_mtd);
2800 }
2801 #endif
2802
2803 static struct file_system_type yaffs_fs_type = {
2804         .owner = THIS_MODULE,
2805         .name = "yaffs",
2806         .get_sb = yaffs_read_super,
2807         .kill_sb = kill_block_super,
2808         .fs_flags = FS_REQUIRES_DEV,
2809 };
2810 #else
2811 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
2812                                             int silent)
2813 {
2814         return yaffs_internal_read_super(1, sb, data, silent);
2815 }
2816
2817 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
2818                       FS_REQUIRES_DEV);
2819 #endif
2820
2821
2822 #ifdef CONFIG_YAFFS_YAFFS2
2823
2824 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2825 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2826                                           int silent)
2827 {
2828         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2829 }
2830
2831 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2832 static int yaffs2_read_super(struct file_system_type *fs,
2833                         int flags, const char *dev_name, void *data,
2834                         struct vfsmount *mnt)
2835 {
2836         return get_sb_bdev(fs, flags, dev_name, data,
2837                         yaffs2_internal_read_super_mtd, mnt);
2838 }
2839 #else
2840 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
2841                                              int flags, const char *dev_name,
2842                                              void *data)
2843 {
2844
2845         return get_sb_bdev(fs, flags, dev_name, data,
2846                            yaffs2_internal_read_super_mtd);
2847 }
2848 #endif
2849
2850 static struct file_system_type yaffs2_fs_type = {
2851         .owner = THIS_MODULE,
2852         .name = "yaffs2",
2853         .get_sb = yaffs2_read_super,
2854         .kill_sb = kill_block_super,
2855         .fs_flags = FS_REQUIRES_DEV,
2856 };
2857 #else
2858 static struct super_block *yaffs2_read_super(struct super_block *sb,
2859                                              void *data, int silent)
2860 {
2861         return yaffs_internal_read_super(2, sb, data, silent);
2862 }
2863
2864 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
2865                       FS_REQUIRES_DEV);
2866 #endif
2867
2868 #endif                          /* CONFIG_YAFFS_YAFFS2 */
2869
2870 static struct proc_dir_entry *my_proc_entry;
2871 static struct proc_dir_entry *debug_proc_entry;
2872
2873 static char *yaffs_dump_dev_part0(char *buf, yaffs_Device * dev)
2874 {
2875         buf += sprintf(buf, "startBlock......... %d\n", dev->param.startBlock);
2876         buf += sprintf(buf, "endBlock........... %d\n", dev->param.endBlock);
2877         buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->param.totalBytesPerChunk);
2878         buf += sprintf(buf, "useNANDECC......... %d\n", dev->param.useNANDECC);
2879         buf += sprintf(buf, "noTagsECC.......... %d\n", dev->param.noTagsECC);
2880         buf += sprintf(buf, "isYaffs2........... %d\n", dev->param.isYaffs2);
2881         buf += sprintf(buf, "inbandTags......... %d\n", dev->param.inbandTags);
2882         buf += sprintf(buf, "emptyLostAndFound.. %d\n", dev->param.emptyLostAndFound);
2883         buf += sprintf(buf, "disableLazyLoad.... %d\n", dev->param.disableLazyLoad);
2884         buf += sprintf(buf, "refreshPeriod...... %d\n", dev->param.refreshPeriod);
2885         buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->param.nShortOpCaches);
2886         buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->param.nReservedBlocks);
2887
2888         buf += sprintf(buf, "\n");
2889
2890         return buf;
2891 }
2892
2893
2894 static char *yaffs_dump_dev_part1(char *buf, yaffs_Device * dev)
2895 {
2896         buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
2897         buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
2898         buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
2899         buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
2900         buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2901         buf += sprintf(buf, "\n");
2902         buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2903         buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2904         buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2905         buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2906         buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2907         buf += sprintf(buf, "\n");
2908         buf += sprintf(buf, "nPageWrites........ %u\n", dev->nPageWrites);
2909         buf += sprintf(buf, "nPageReads......... %u\n", dev->nPageReads);
2910         buf += sprintf(buf, "nBlockErasures..... %u\n", dev->nBlockErasures);
2911         buf += sprintf(buf, "nGCCopies.......... %u\n", dev->nGCCopies);
2912         buf += sprintf(buf, "allGCs............. %u\n", dev->allGCs);
2913         buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGCs);
2914         buf += sprintf(buf, "oldestDirtyGCs..... %u\n", dev->oldestDirtyGCs);
2915         buf += sprintf(buf, "backgroundGCs...... %u\n", dev->backgroundGCs);
2916         buf += sprintf(buf, "nRetriedWrites..... %u\n", dev->nRetriedWrites);
2917         buf += sprintf(buf, "nRetireBlocks...... %u\n", dev->nRetiredBlocks);
2918         buf += sprintf(buf, "eccFixed........... %u\n", dev->eccFixed);
2919         buf += sprintf(buf, "eccUnfixed......... %u\n", dev->eccUnfixed);
2920         buf += sprintf(buf, "tagsEccFixed....... %u\n", dev->tagsEccFixed);
2921         buf += sprintf(buf, "tagsEccUnfixed..... %u\n", dev->tagsEccUnfixed);
2922         buf += sprintf(buf, "cacheHits.......... %u\n", dev->cacheHits);
2923         buf += sprintf(buf, "nDeletedFiles...... %u\n", dev->nDeletedFiles);
2924         buf += sprintf(buf, "nUnlinkedFiles..... %u\n", dev->nUnlinkedFiles);
2925         buf += sprintf(buf, "refreshCount....... %u\n", dev->refreshCount);
2926         buf +=
2927             sprintf(buf, "nBackgroudDeletions %u\n", dev->nBackgroundDeletions);
2928
2929         return buf;
2930 }
2931
2932 static int yaffs_proc_read(char *page,
2933                            char **start,
2934                            off_t offset, int count, int *eof, void *data)
2935 {
2936         struct ylist_head *item;
2937         char *buf = page;
2938         int step = offset;
2939         int n = 0;
2940
2941         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2942          * We use 'offset' (*ppos) to indicate where we are in devList.
2943          * This also assumes the user has posted a read buffer large
2944          * enough to hold the complete output; but that's life in /proc.
2945          */
2946
2947         *(int *)start = 1;
2948
2949         /* Print header first */
2950         if (step == 0)
2951                 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2952                                "\n%s\n%s\n", yaffs_fs_c_version,
2953                                yaffs_guts_c_version);
2954         else if (step == 1)
2955                 buf += sprintf(buf,"\n");
2956         else {
2957                 step-=2;
2958
2959                 down(&yaffs_context_lock);
2960
2961                 /* Locate and print the Nth entry.  Order N-squared but N is small. */
2962                 ylist_for_each(item, &yaffs_context_list) {
2963                         struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
2964                         yaffs_Device *dev = dc->dev;
2965
2966                         if (n < (step & ~1)) {
2967                                 n+=2;
2968                                 continue;
2969                         }
2970                         if((step & 1)==0){
2971                                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->param.name);
2972                                 buf = yaffs_dump_dev_part0(buf, dev);
2973                         } else
2974                                 buf = yaffs_dump_dev_part1(buf, dev);
2975
2976                         break;
2977                 }
2978                 up(&yaffs_context_lock);
2979         }
2980
2981         return buf - page < count ? buf - page : count;
2982 }
2983
2984 static int yaffs_debug_proc_read(char *page,
2985                                 char **start,
2986                                 off_t offset, int count, int *eof, void *data)
2987 {
2988         struct ylist_head *item;
2989         char *buf = page;
2990         int n = 0;
2991
2992         down(&yaffs_context_lock);
2993
2994         /* Locate and print the Nth entry.  Order N-squared but N is small. */
2995         ylist_for_each(item, &yaffs_context_list) {
2996                 struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
2997                 yaffs_Device *dev = dc->dev;
2998
2999                 int erasedChunks;
3000                 int nObjects;
3001                 int nTnodes;
3002
3003                 erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3004                 nObjects = dev->nObjectsCreated -dev->nFreeObjects;
3005                 nTnodes = dev->nTnodesCreated - dev->nFreeTnodes;
3006
3007
3008                 buf += sprintf(buf,"%d, %d, %d, %u, %u, %d, %d\n",
3009                                 n, dev->nFreeChunks, erasedChunks,
3010                                 dev->backgroundGCs, dev->oldestDirtyGCs,
3011                                 nObjects, nTnodes);
3012         }
3013         up(&yaffs_context_lock);
3014
3015
3016         return buf - page < count ? buf - page : count;
3017 }
3018
3019 /**
3020  * Set the verbosity of the warnings and error messages.
3021  *
3022  * Note that the names can only be a..z or _ with the current code.
3023  */
3024
3025 static struct {
3026         char *mask_name;
3027         unsigned mask_bitfield;
3028 } mask_flags[] = {
3029         {"allocate", YAFFS_TRACE_ALLOCATE},
3030         {"always", YAFFS_TRACE_ALWAYS},
3031         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
3032         {"buffers", YAFFS_TRACE_BUFFERS},
3033         {"bug", YAFFS_TRACE_BUG},
3034         {"checkpt", YAFFS_TRACE_CHECKPOINT},
3035         {"deletion", YAFFS_TRACE_DELETION},
3036         {"erase", YAFFS_TRACE_ERASE},
3037         {"error", YAFFS_TRACE_ERROR},
3038         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
3039         {"gc", YAFFS_TRACE_GC},
3040         {"mtd", YAFFS_TRACE_MTD},
3041         {"nandaccess", YAFFS_TRACE_NANDACCESS},
3042         {"os", YAFFS_TRACE_OS},
3043         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
3044         {"scan", YAFFS_TRACE_SCAN},
3045         {"tracing", YAFFS_TRACE_TRACING},
3046         {"sync", YAFFS_TRACE_SYNC},
3047
3048         {"background", YAFFS_TRACE_BACKGROUND},
3049
3050         {"verify", YAFFS_TRACE_VERIFY},
3051         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
3052         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
3053         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
3054
3055         {"write", YAFFS_TRACE_WRITE},
3056         {"all", 0xffffffff},
3057         {"none", 0},
3058         {NULL, 0},
3059 };
3060
3061 #define MAX_MASK_NAME_LENGTH 40
3062 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
3063                                          unsigned long count, void *data)
3064 {
3065         unsigned rg = 0, mask_bitfield;
3066         char *end;
3067         char *mask_name;
3068         const char *x;
3069         char substring[MAX_MASK_NAME_LENGTH + 1];
3070         int i;
3071         int done = 0;
3072         int add, len = 0;
3073         int pos = 0;
3074
3075         rg = yaffs_traceMask;
3076
3077         while (!done && (pos < count)) {
3078                 done = 1;
3079                 while ((pos < count) && isspace(buf[pos]))
3080                         pos++;
3081
3082                 switch (buf[pos]) {
3083                 case '+':
3084                 case '-':
3085                 case '=':
3086                         add = buf[pos];
3087                         pos++;
3088                         break;
3089
3090                 default:
3091                         add = ' ';
3092                         break;
3093                 }
3094                 mask_name = NULL;
3095
3096                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
3097
3098                 if (end > buf + pos) {
3099                         mask_name = "numeral";
3100                         len = end - (buf + pos);
3101                         pos += len;
3102                         done = 0;
3103                 } else {
3104                         for (x = buf + pos, i = 0;
3105                             (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
3106                             i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
3107                                 substring[i] = *x;
3108                         substring[i] = '\0';
3109
3110                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3111                                 if (strcmp(substring, mask_flags[i].mask_name) == 0) {
3112                                         mask_name = mask_flags[i].mask_name;
3113                                         mask_bitfield = mask_flags[i].mask_bitfield;
3114                                         done = 0;
3115                                         break;
3116                                 }
3117                         }
3118                 }
3119
3120                 if (mask_name != NULL) {
3121                         done = 0;
3122                         switch (add) {
3123                         case '-':
3124                                 rg &= ~mask_bitfield;
3125                                 break;
3126                         case '+':
3127                                 rg |= mask_bitfield;
3128                                 break;
3129                         case '=':
3130                                 rg = mask_bitfield;
3131                                 break;
3132                         default:
3133                                 rg |= mask_bitfield;
3134                                 break;
3135                         }
3136                 }
3137         }
3138
3139         yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
3140
3141         printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
3142
3143         if (rg & YAFFS_TRACE_ALWAYS) {
3144                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3145                         char flag;
3146                         flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
3147                         printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
3148                 }
3149         }
3150
3151         return count;
3152 }
3153
3154
3155 static int yaffs_proc_write(struct file *file, const char *buf,
3156                                          unsigned long count, void *data)
3157 {
3158         return yaffs_proc_write_trace_options(file, buf, count, data);
3159 }
3160
3161 /* Stuff to handle installation of file systems */
3162 struct file_system_to_install {
3163         struct file_system_type *fst;
3164         int installed;
3165 };
3166
3167 static struct file_system_to_install fs_to_install[] = {
3168         {&yaffs_fs_type, 0},
3169         {&yaffs2_fs_type, 0},
3170         {NULL, 0}
3171 };
3172
3173 static int __init init_yaffs_fs(void)
3174 {
3175         int error = 0;
3176         struct file_system_to_install *fsinst;
3177
3178         T(YAFFS_TRACE_ALWAYS,
3179           ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
3180
3181         init_MUTEX(&yaffs_context_lock);
3182
3183         /* Install the proc_fs entries */
3184         my_proc_entry = create_proc_entry("yaffs",
3185                                                S_IRUGO | S_IFREG,
3186                                                YPROC_ROOT);
3187
3188         if (my_proc_entry) {
3189                 my_proc_entry->write_proc = yaffs_proc_write;
3190                 my_proc_entry->read_proc = yaffs_proc_read;
3191                 my_proc_entry->data = NULL;
3192         } else
3193                 return -ENOMEM;
3194
3195         debug_proc_entry = create_proc_entry("yaffs_debug",
3196                                                S_IRUGO | S_IFREG,
3197                                                YPROC_ROOT);
3198
3199         if (debug_proc_entry) {
3200                 debug_proc_entry->write_proc = NULL;
3201                 debug_proc_entry->read_proc = yaffs_debug_proc_read;
3202                 debug_proc_entry->data = NULL;
3203         } else
3204                 return -ENOMEM;
3205
3206         /* Now add the file system entries */
3207
3208         fsinst = fs_to_install;
3209
3210         while (fsinst->fst && !error) {
3211                 error = register_filesystem(fsinst->fst);
3212                 if (!error)
3213                         fsinst->installed = 1;
3214                 fsinst++;
3215         }
3216
3217         /* Any errors? uninstall  */
3218         if (error) {
3219                 fsinst = fs_to_install;
3220
3221                 while (fsinst->fst) {
3222                         if (fsinst->installed) {
3223                                 unregister_filesystem(fsinst->fst);
3224                                 fsinst->installed = 0;
3225                         }
3226                         fsinst++;
3227                 }
3228         }
3229
3230         return error;
3231 }
3232
3233 static void __exit exit_yaffs_fs(void)
3234 {
3235
3236         struct file_system_to_install *fsinst;
3237
3238         T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
3239                                " removing. \n"));
3240
3241         remove_proc_entry("yaffs", YPROC_ROOT);
3242         remove_proc_entry("yaffs_debug", YPROC_ROOT);
3243
3244         fsinst = fs_to_install;
3245
3246         while (fsinst->fst) {
3247                 if (fsinst->installed) {
3248                         unregister_filesystem(fsinst->fst);
3249                         fsinst->installed = 0;
3250                 }
3251                 fsinst++;
3252         }
3253 }
3254
3255 module_init(init_yaffs_fs)
3256 module_exit(exit_yaffs_fs)
3257
3258 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3259 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
3260 MODULE_LICENSE("GPL");