yaffs_vfs_multi.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2010 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_dev_t associated with
  28  *         this superblock
  29  * >> 2.6: sb->s_fs_info  points to the yaffs_dev_t associated with this
  30  *         superblock
  31  * >> inode->u.generic_ip points to the associated yaffs_obj_t.
  32  */
  33
  34 /*
  35  * There are two variants of the VFS glue code. This variant should compile
  36  * for any version of Linux.
  37  */
  38 #include <linux/version.h>
  39
  40 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
  41 #define YAFFS_COMPILE_BACKGROUND
  42 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6, 23))
  43 #define YAFFS_COMPILE_FREEZER
  44 #endif
  45 #endif
  46
  47 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28))
  48 #define YAFFS_COMPILE_EXPORTFS
  49 #endif
  50
  51 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
  52 #define YAFFS_USE_SETATTR_COPY
  53 #define YAFFS_USE_TRUNCATE_SETSIZE
  54 #endif
  55 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
  56 #define YAFFS_HAS_EVICT_INODE
  57 #endif
  58
  59 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
  60 #define YAFFS_NEW_FOLLOW_LINK 1
  61 #else
  62 #define YAFFS_NEW_FOLLOW_LINK 0
  63 #endif
  64
  65 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
  66 #include <linux/config.h>
  67 #endif
  68
  69 #include <linux/kernel.h>
  70 #include <linux/module.h>
  71 #include <linux/slab.h>
  72 #include <linux/init.h>
  73 #include <linux/fs.h>
  74 #include <linux/proc_fs.h>
  75 #include <linux/smp_lock.h>
  76 #include <linux/pagemap.h>
  77 #include <linux/mtd/mtd.h>
  78 #include <linux/interrupt.h>
  79 #include <linux/string.h>
  80 #include <linux/ctype.h>
  81
  82 #if (YAFFS_NEW_FOLLOW_LINK == 1)
  83 #include <linux/namei.h>
  84 #endif
  85
  86 #ifdef YAFFS_COMPILE_EXPORTFS
  87 #include <linux/exportfs.h>
  88 #endif
  89
  90 #ifdef YAFFS_COMPILE_BACKGROUND
  91 #include <linux/kthread.h>
  92 #include <linux/delay.h>
  93 #endif
  94 #ifdef YAFFS_COMPILE_FREEZER
  95 #include <linux/freezer.h>
  96 #endif
  97
  98 #include <asm/div64.h>
  99
 100 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 101
 102 #include <linux/statfs.h>
 103
 104 #define UnlockPage(p) unlock_page(p)
 105 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
 106
 107 /* FIXME: use sb->s_id instead ? */
 108 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)
 109
 110 #else
 111
 112 #include <linux/locks.h>
 113 #define BDEVNAME_SIZE           0
 114 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
 115
 116 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
 117 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
 118 #define __user
 119 #endif
 120
 121 #endif
 122
 123 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
 124 #define YPROC_ROOT  (&proc_root)
 125 #else
 126 #define YPROC_ROOT  NULL
 127 #endif
 128
 129 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
 130 #define Y_INIT_TIMER(a) init_timer(a)
 131 #else
 132 #define Y_INIT_TIMER(a) init_timer_on_stack(a)
 133 #endif
 134
 135 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 136 #define WRITE_SIZE_STR "writesize"
 137 #define WRITE_SIZE(mtd) ((mtd)->writesize)
 138 #else
 139 #define WRITE_SIZE_STR "oobblock"
 140 #define WRITE_SIZE(mtd) ((mtd)->oobblock)
 141 #endif
 142
 143 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
 144 #define YAFFS_USE_WRITE_BEGIN_END 1
 145 #else
 146 #define YAFFS_USE_WRITE_BEGIN_END 0
 147 #endif
 148
 149 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
 150 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
 151 {
 152         uint64_t result = partition_size;
 153         do_div(result, block_size);
 154         return (uint32_t)result;
 155 }
 156 #else
 157 #define YCALCBLOCKS(s, b) ((s)/(b))
 158 #endif
 159
 160 #include <linux/uaccess.h>
 161 #include <linux/mtd/mtd.h>
 162
 163 #include "yportenv.h"
 164 #include "yaffs_trace.h"
 165 #include "yaffs_guts.h"
 166
 167 #include "yaffs_linux.h"
 168
 169 #include "yaffs_mtdif.h"
 170 #include "yaffs_mtdif1.h"
 171 #include "yaffs_mtdif2.h"
 172
 173 unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
 174 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
 175 unsigned int yaffs_auto_checkpoint = 1;
 176 unsigned int yaffs_gc_control = 1;
 177 unsigned int yaffs_bg_enable = 1;
 178
 179 /* Module Parameters */
 180 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 181 module_param(yaffs_trace_mask, uint, 0644);
 182 module_param(yaffs_wr_attempts, uint, 0644);
 183 module_param(yaffs_auto_checkpoint, uint, 0644);
 184 module_param(yaffs_gc_control, uint, 0644);
 185 module_param(yaffs_bg_enable, uint, 0644);
 186 #else
 187 MODULE_PARM(yaffs_trace_mask, "i");
 188 MODULE_PARM(yaffs_wr_attempts, "i");
 189 MODULE_PARM(yaffs_auto_checkpoint, "i");
 190 MODULE_PARM(yaffs_gc_control, "i");
 191 #endif
 192
 193 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
 194 /* use iget and read_inode */
 195 #define Y_IGET(sb, inum) iget((sb), (inum))
 196 static void yaffs_read_inode(struct inode *inode);
 197
 198 #else
 199 /* Call local equivalent */
 200 #define YAFFS_USE_OWN_IGET
 201 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
 202
 203 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
 204 #endif
 205
 206 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
 207 #define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
 208 #else
 209 #define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
 210 #endif
 211
 212 #define yaffs_InodeToObject(iptr) ((yaffs_obj_t *)(yaffs_InodeToObjectLV(iptr)))
 213 #define yaffs_dentry_to_obj(dptr) yaffs_InodeToObject((dptr)->d_inode)
 214
 215 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 216 #define yaffs_SuperToDevice(sb) ((yaffs_dev_t *)sb->s_fs_info)
 217 #else
 218 #define yaffs_SuperToDevice(sb) ((yaffs_dev_t *)sb->u.generic_sbp)
 219 #endif
 220
 221
 222 #define update_dir_time(dir) do {\
 223                         (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
 224                 } while(0)
 225
 226 static void yaffs_put_super(struct super_block *sb);
 227
 228 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 229                                 loff_t *pos);
 230 static ssize_t yaffs_hold_space(struct file *f);
 231 static void yaffs_release_space(struct file *f);
 232
 233 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 234 static int yaffs_file_flush(struct file *file, fl_owner_t id);
 235 #else
 236 static int yaffs_file_flush(struct file *file);
 237 #endif
 238
 239 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
 240 static int yaffs_sync_object(struct file *file, int datasync);
 241 #else
 242 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 243                                 int datasync);
 244 #endif
 245
 246 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 247
 248 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 249 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 250                         struct nameidata *n);
 251 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 252                                         struct nameidata *n);
 253 #else
 254 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 255 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 256 #endif
 257 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 258                         struct dentry *dentry);
 259 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 260 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 261                         const char *symname);
 262 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 263
 264 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 265 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 266                         dev_t dev);
 267 #else
 268 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 269                         int dev);
 270 #endif
 271 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 272                         struct inode *new_dir, struct dentry *new_dentry);
 273 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 274
 275 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 276 static int yaffs_sync_fs(struct super_block *sb, int wait);
 277 static void yaffs_write_super(struct super_block *sb);
 278 #else
 279 static int yaffs_sync_fs(struct super_block *sb);
 280 static int yaffs_write_super(struct super_block *sb);
 281 #endif
 282
 283 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 284 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
 285 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 286 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 287 #else
 288 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 289 #endif
 290
 291 #ifdef YAFFS_HAS_PUT_INODE
 292 static void yaffs_put_inode(struct inode *inode);
 293 #endif
 294
 295 #ifdef YAFFS_HAS_EVICT_INODE
 296 static void yaffs_evict_inode(struct inode *);
 297 #else
 298 static void yaffs_delete_inode(struct inode *);
 299 static void yaffs_clear_inode(struct inode *);
 300 #endif
 301
 302 static int yaffs_readpage(struct file *file, struct page *page);
 303 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 304 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 305 #else
 306 static int yaffs_writepage(struct page *page);
 307 #endif
 308
 309 #ifdef CONFIG_YAFFS_XATTR
 310 int yaffs_setxattr(struct dentry *dentry, const char *name,
 311                         const void *value, size_t size, int flags);
 312 ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
 313                         size_t size);
 314 int yaffs_removexattr(struct dentry *dentry, const char *name);
 315 ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
 316 #endif
 317
 318
 319 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
 320 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 321                                 loff_t pos, unsigned len, unsigned flags,
 322                                 struct page **pagep, void **fsdata);
 323 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 324                                 loff_t pos, unsigned len, unsigned copied,
 325                                 struct page *pg, void *fsdadata);
 326 #else
 327 static int yaffs_prepare_write(struct file *f, struct page *pg,
 328                                 unsigned offset, unsigned to);
 329 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 330                                 unsigned to);
 331
 332 #endif
 333
 334 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
 335                                 int buflen);
 336 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 337 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
 338 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 339 #else
 340 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 341 #endif
 342
 343 static void yaffs_touch_super(yaffs_dev_t *dev);
 344
 345 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
 346
 347 static int yaffs_vfs_setattr(struct inode *, struct iattr *);
 348
 349
 350 static struct address_space_operations yaffs_file_address_operations = {
 351         .readpage = yaffs_readpage,
 352         .writepage = yaffs_writepage,
 353 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 354         .write_begin = yaffs_write_begin,
 355         .write_end = yaffs_write_end,
 356 #else
 357         .prepare_write = yaffs_prepare_write,
 358         .commit_write = yaffs_commit_write,
 359 #endif
 360 };
 361
 362
 363 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
 364 static const struct file_operations yaffs_file_operations = {
 365         .read = do_sync_read,
 366         .write = do_sync_write,
 367         .aio_read = generic_file_aio_read,
 368         .aio_write = generic_file_aio_write,
 369         .mmap = generic_file_mmap,
 370         .flush = yaffs_file_flush,
 371         .fsync = yaffs_sync_object,
 372         .splice_read = generic_file_splice_read,
 373         .splice_write = generic_file_splice_write,
 374         .llseek = generic_file_llseek,
 375 };
 376
 377 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
 378
 379 static const struct file_operations yaffs_file_operations = {
 380         .read = do_sync_read,
 381         .write = do_sync_write,
 382         .aio_read = generic_file_aio_read,
 383         .aio_write = generic_file_aio_write,
 384         .mmap = generic_file_mmap,
 385         .flush = yaffs_file_flush,
 386         .fsync = yaffs_sync_object,
 387         .sendfile = generic_file_sendfile,
 388 };
 389
 390 #else
 391
 392 static const struct file_operations yaffs_file_operations = {
 393         .read = generic_file_read,
 394         .write = generic_file_write,
 395         .mmap = generic_file_mmap,
 396         .flush = yaffs_file_flush,
 397         .fsync = yaffs_sync_object,
 398 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 399         .sendfile = generic_file_sendfile,
 400 #endif
 401 };
 402 #endif
 403
 404 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
 405 static void zero_user_segment(struct page *page, unsigned start, unsigned end)
 406 {
 407         void * kaddr = kmap_atomic(page, KM_USER0);
 408         memset(kaddr + start, 0, end - start);
 409         kunmap_atomic(kaddr, KM_USER0);
 410         flush_dcache_page(page);
 411 }
 412 #endif
 413
 414
 415 static const struct inode_operations yaffs_file_inode_operations = {
 416         .setattr = yaffs_setattr,
 417 #ifdef CONFIG_YAFFS_XATTR
 418         .setxattr = yaffs_setxattr,
 419         .getxattr = yaffs_getxattr,
 420         .listxattr = yaffs_listxattr,
 421         .removexattr = yaffs_removexattr,
 422 #endif
 423 };
 424
 425 static const struct inode_operations yaffs_symlink_inode_operations = {
 426         .readlink = yaffs_readlink,
 427         .follow_link = yaffs_follow_link,
 428 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 429         .put_link = yaffs_put_link,
 430 #endif
 431         .setattr = yaffs_setattr,
 432 #ifdef CONFIG_YAFFS_XATTR
 433         .setxattr = yaffs_setxattr,
 434         .getxattr = yaffs_getxattr,
 435         .listxattr = yaffs_listxattr,
 436         .removexattr = yaffs_removexattr,
 437 #endif
 438 };
 439
 440 static const struct inode_operations yaffs_dir_inode_operations = {
 441         .create = yaffs_create,
 442         .lookup = yaffs_lookup,
 443         .link = yaffs_link,
 444         .unlink = yaffs_unlink,
 445         .symlink = yaffs_symlink,
 446         .mkdir = yaffs_mkdir,
 447         .rmdir = yaffs_unlink,
 448         .mknod = yaffs_mknod,
 449         .rename = yaffs_rename,
 450         .setattr = yaffs_setattr,
 451 #ifdef CONFIG_YAFFS_XATTR
 452         .setxattr = yaffs_setxattr,
 453         .getxattr = yaffs_getxattr,
 454         .listxattr = yaffs_listxattr,
 455         .removexattr = yaffs_removexattr,
 456 #endif
 457 };
 458
 459 static const struct file_operations yaffs_dir_operations = {
 460         .read = generic_read_dir,
 461         .readdir = yaffs_readdir,
 462         .fsync = yaffs_sync_object,
 463         .llseek = yaffs_dir_llseek,
 464 };
 465
 466 static const struct super_operations yaffs_super_ops = {
 467         .statfs = yaffs_statfs,
 468
 469 #ifndef YAFFS_USE_OWN_IGET
 470         .read_inode = yaffs_read_inode,
 471 #endif
 472 #ifdef YAFFS_HAS_PUT_INODE
 473         .put_inode = yaffs_put_inode,
 474 #endif
 475         .put_super = yaffs_put_super,
 476 #ifdef YAFFS_HAS_EVICT_INODE
 477         .evict_inode = yaffs_evict_inode,
 478 #else
 479         .delete_inode = yaffs_delete_inode,
 480         .clear_inode = yaffs_clear_inode,
 481 #endif
 482         .sync_fs = yaffs_sync_fs,
 483         .write_super = yaffs_write_super,
 484 };
 485
 486
 487 static  int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
 488 {
 489 #ifdef  YAFFS_USE_SETATTR_COPY
 490         setattr_copy(inode,attr);
 491         return 0;
 492 #else
 493         return inode_setattr(inode, attr);
 494 #endif
 495
 496 }
 497
 498 static  int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
 499 {
 500 #ifdef  YAFFS_USE_TRUNCATE_SETSIZE
 501         truncate_setsize(inode,newsize);
 502         return 0;
 503 #else
 504         truncate_inode_pages(&inode->i_data,newsize);
 505         return 0;
 506 #endif
 507
 508 }
 509
 510 static unsigned yaffs_gc_control_callback(yaffs_dev_t *dev)
 511 {
 512         return yaffs_gc_control;
 513 }
 514
 515 static void yaffs_gross_lock(yaffs_dev_t *dev)
 516 {
 517         T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
 518         down(&(yaffs_dev_to_lc(dev)->grossLock));
 519         T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
 520 }
 521
 522 static void yaffs_gross_unlock(yaffs_dev_t *dev)
 523 {
 524         T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
 525         up(&(yaffs_dev_to_lc(dev)->grossLock));
 526 }
 527
 528 #ifdef YAFFS_COMPILE_EXPORTFS
 529
 530 static struct inode *
 531 yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation)
 532 {
 533         return Y_IGET(sb, ino);
 534 }
 535
 536 static struct dentry *
 537 yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
 538 {
 539         return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode) ;
 540 }
 541
 542 static struct dentry *
 543  yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
 544 {
 545         return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode);
 546 }
 547
 548 struct dentry *yaffs2_get_parent(struct dentry *dentry)
 549 {
 550
 551         struct super_block *sb = dentry->d_inode->i_sb;
 552         struct dentry *parent = ERR_PTR(-ENOENT);
 553         struct inode *inode;
 554         unsigned long parent_ino;
 555         yaffs_obj_t *d_obj;
 556         yaffs_obj_t *parent_obj;
 557
 558         d_obj = yaffs_InodeToObject(dentry->d_inode);
 559
 560         if (d_obj) {
 561                 parent_obj = d_obj->parent;
 562                 if (parent_obj) {
 563                         parent_ino = yaffs_get_obj_inode(parent_obj);
 564                         inode = Y_IGET(sb, parent_ino);
 565
 566                         if (IS_ERR(inode)) {
 567                                 parent = ERR_CAST(inode);
 568                         } else {
 569                                 parent = d_obtain_alias(inode);
 570                                 if (!IS_ERR(parent)) {
 571                                         parent = ERR_PTR(-ENOMEM);
 572                                         iput(inode);
 573                                 }
 574                         }
 575                 }
 576         }
 577
 578         return parent;
 579 }
 580
 581 /* Just declare a zero structure as a NULL value implies
 582  * using the default functions of exportfs.
 583  */
 584
 585 static struct export_operations yaffs_export_ops =
 586 {
 587         .fh_to_dentry = yaffs2_fh_to_dentry,
 588         .fh_to_parent = yaffs2_fh_to_parent,
 589         .get_parent = yaffs2_get_parent,
 590 } ;
 591
 592 #endif
 593
 594 /*-----------------------------------------------------------------*/
 595 /* Directory search context allows us to unlock access to yaffs during
 596  * filldir without causing problems with the directory being modified.
 597  * This is similar to the tried and tested mechanism used in yaffs direct.
 598  *
 599  * A search context iterates along a doubly linked list of siblings in the
 600  * directory. If the iterating object is deleted then this would corrupt
 601  * the list iteration, likely causing a crash. The search context avoids
 602  * this by using the remove_obj_fn to move the search context to the
 603  * next object before the object is deleted.
 604  *
 605  * Many readdirs (and thus seach conexts) may be alive simulateously so
 606  * each yaffs_dev_t has a list of these.
 607  *
 608  * A seach context lives for the duration of a readdir.
 609  *
 610  * All these functions must be called while yaffs is locked.
 611  */
 612
 613 struct yaffs_SearchContext {
 614         yaffs_dev_t *dev;
 615         yaffs_obj_t *dirObj;
 616         yaffs_obj_t *nextReturn;
 617         struct ylist_head others;
 618 };
 619
 620 /*
 621  * yaffs_NewSearch() creates a new search context, initialises it and
 622  * adds it to the device's search context list.
 623  *
 624  * Called at start of readdir.
 625  */
 626 static struct yaffs_SearchContext * yaffs_NewSearch(yaffs_obj_t *dir)
 627 {
 628         yaffs_dev_t *dev = dir->my_dev;
 629         struct yaffs_SearchContext *sc = YMALLOC(sizeof(struct yaffs_SearchContext));
 630         if(sc){
 631                 sc->dirObj = dir;
 632                 sc->dev = dev;
 633                 if( ylist_empty(&sc->dirObj->variant.dir_variant.children))
 634                         sc->nextReturn = NULL;
 635                 else
 636                         sc->nextReturn = ylist_entry(
 637                                 dir->variant.dir_variant.children.next,
 638                                 yaffs_obj_t,siblings);
 639                 YINIT_LIST_HEAD(&sc->others);
 640                 ylist_add(&sc->others,&(yaffs_dev_to_lc(dev)->searchContexts));
 641         }
 642         return sc;
 643 }
 644
 645 /*
 646  * yaffs_search_end() disposes of a search context and cleans up.
 647  */
 648 static void yaffs_search_end(struct yaffs_SearchContext * sc)
 649 {
 650         if(sc){
 651                 ylist_del(&sc->others);
 652                 YFREE(sc);
 653         }
 654 }
 655
 656 /*
 657  * yaffs_search_advance() moves a search context to the next object.
 658  * Called when the search iterates or when an object removal causes
 659  * the search context to be moved to the next object.
 660  */
 661 static void yaffs_search_advance(struct yaffs_SearchContext *sc)
 662 {
 663         if(!sc)
 664                 return;
 665
 666         if( sc->nextReturn == NULL ||
 667                 ylist_empty(&sc->dirObj->variant.dir_variant.children))
 668                 sc->nextReturn = NULL;
 669         else {
 670                 struct ylist_head *next = sc->nextReturn->siblings.next;
 671
 672                 if( next == &sc->dirObj->variant.dir_variant.children)
 673                         sc->nextReturn = NULL; /* end of list */
 674                 else
 675                         sc->nextReturn = ylist_entry(next,yaffs_obj_t,siblings);
 676         }
 677 }
 678
 679 /*
 680  * yaffs_remove_obj_callback() is called when an object is unlinked.
 681  * We check open search contexts and advance any which are currently
 682  * on the object being iterated.
 683  */
 684 static void yaffs_remove_obj_callback(yaffs_obj_t *obj)
 685 {
 686
 687         struct ylist_head *i;
 688         struct yaffs_SearchContext *sc;
 689         struct ylist_head *search_contexts = &(yaffs_dev_to_lc(obj->my_dev)->searchContexts);
 690
 691
 692         /* Iterate through the directory search contexts.
 693          * If any are currently on the object being removed, then advance
 694          * the search context to the next object to prevent a hanging pointer.
 695          */
 696          ylist_for_each(i, search_contexts) {
 697                 if (i) {
 698                         sc = ylist_entry(i, struct yaffs_SearchContext,others);
 699                         if(sc->nextReturn == obj)
 700                                 yaffs_search_advance(sc);
 701                 }
 702         }
 703
 704 }
 705
 706
 707 /*-----------------------------------------------------------------*/
 708
 709 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
 710                         int buflen)
 711 {
 712         unsigned char *alias;
 713         int ret;
 714
 715         yaffs_dev_t *dev = yaffs_dentry_to_obj(dentry)->my_dev;
 716
 717         yaffs_gross_lock(dev);
 718
 719         alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
 720
 721         yaffs_gross_unlock(dev);
 722
 723         if (!alias)
 724                 return -ENOMEM;
 725
 726         ret = vfs_readlink(dentry, buffer, buflen, alias);
 727         kfree(alias);
 728         return ret;
 729 }
 730
 731 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 732 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 733 #else
 734 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 735 #endif
 736 {
 737         unsigned char *alias;
 738         int ret;
 739         yaffs_dev_t *dev = yaffs_dentry_to_obj(dentry)->my_dev;
 740
 741         yaffs_gross_lock(dev);
 742
 743         alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
 744         yaffs_gross_unlock(dev);
 745
 746         if (!alias) {
 747                 ret = -ENOMEM;
 748                 goto out;
 749         }
 750
 751 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 752         nd_set_link(nd, alias);
 753         ret = (int)alias;
 754 out:
 755         return ERR_PTR(ret);
 756 #else
 757         ret = vfs_follow_link(nd, alias);
 758         kfree(alias);
 759 out:
 760         return ret;
 761 #endif
 762 }
 763
 764 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 765 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) {
 766         kfree(alias);
 767 }
 768 #endif
 769
 770 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 771                                 yaffs_obj_t *obj);
 772
 773 /*
 774  * Lookup is used to find objects in the fs
 775  */
 776 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 777
 778 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 779                                 struct nameidata *n)
 780 #else
 781 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 782 #endif
 783 {
 784         yaffs_obj_t *obj;
 785         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 786
 787         yaffs_dev_t *dev = yaffs_InodeToObject(dir)->my_dev;
 788
 789         if(current != yaffs_dev_to_lc(dev)->readdirProcess)
 790                 yaffs_gross_lock(dev);
 791
 792         T(YAFFS_TRACE_OS,
 793                 (TSTR("yaffs_lookup for %d:%s\n"),
 794                 yaffs_InodeToObject(dir)->obj_id, dentry->d_name.name));
 795
 796         obj = yaffs_find_by_name(yaffs_InodeToObject(dir),
 797                                         dentry->d_name.name);
 798
 799         obj = yaffs_get_equivalent_obj(obj);    /* in case it was a hardlink */
 800
 801         /* Can't hold gross lock when calling yaffs_get_inode() */
 802         if(current != yaffs_dev_to_lc(dev)->readdirProcess)
 803                 yaffs_gross_unlock(dev);
 804
 805         if (obj) {
 806                 T(YAFFS_TRACE_OS,
 807                         (TSTR("yaffs_lookup found %d\n"), obj->obj_id));
 808
 809                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 810
 811                 if (inode) {
 812                         T(YAFFS_TRACE_OS,
 813                                 (TSTR("yaffs_loookup dentry \n")));
 814 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
 815  * d_add even if NULL inode */
 816 #if 0
 817                         /*dget(dentry); // try to solve directory bug */
 818                         d_add(dentry, inode);
 819
 820                         /* return dentry; */
 821                         return NULL;
 822 #endif
 823                 }
 824
 825         } else {
 826                 T(YAFFS_TRACE_OS,(TSTR("yaffs_lookup not found\n")));
 827
 828         }
 829
 830 /* added NCB for 2.5/6 compatability - forces add even if inode is
 831  * NULL which creates dentry hash */
 832         d_add(dentry, inode);
 833
 834         return NULL;
 835 }
 836
 837
 838 #ifdef YAFFS_HAS_PUT_INODE
 839
 840 /* For now put inode is just for debugging
 841  * Put inode is called when the inode **structure** is put.
 842  */
 843 static void yaffs_put_inode(struct inode *inode)
 844 {
 845         T(YAFFS_TRACE_OS,
 846                 (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
 847                 atomic_read(&inode->i_count)));
 848
 849 }
 850 #endif
 851
 852
 853 static void yaffs_unstitch_obj(struct inode *inode, yaffs_obj_t *obj)
 854 {
 855         /* Clear the association between the inode and
 856          * the yaffs_obj_t.
 857          */
 858         obj->my_inode = NULL;
 859         yaffs_InodeToObjectLV(inode) = NULL;
 860
 861         /* If the object freeing was deferred, then the real
 862          * free happens now.
 863          * This should fix the inode inconsistency problem.
 864          */
 865         yaffs_handle_defered_free(obj);
 866 }
 867
 868 #ifdef YAFFS_HAS_EVICT_INODE
 869 /* yaffs_evict_inode combines into one operation what was previously done in
 870  * yaffs_clear_inode() and yaffs_delete_inode()
 871  *
 872  */
 873 static void yaffs_evict_inode( struct inode *inode)
 874 {
 875         yaffs_obj_t *obj;
 876         yaffs_dev_t *dev;
 877         int deleteme = 0;
 878
 879         obj = yaffs_InodeToObject(inode);
 880
 881         T(YAFFS_TRACE_OS,
 882                 (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
 883                 atomic_read(&inode->i_count),
 884                 obj ? "object exists" : "null object"));
 885
 886         if (!inode->i_nlink && !is_bad_inode(inode))
 887                 deleteme = 1;
 888         truncate_inode_pages(&inode->i_data,0);
 889         end_writeback(inode);
 890
 891         if(deleteme && obj){
 892                 dev = obj->my_dev;
 893                 yaffs_gross_lock(dev);
 894                 yaffs_del_obj(obj);
 895                 yaffs_gross_unlock(dev);
 896         }
 897         if (obj) {
 898                 dev = obj->my_dev;
 899                 yaffs_gross_lock(dev);
 900                 yaffs_unstitch_obj(inode,obj);
 901                 yaffs_gross_unlock(dev);
 902         }
 903
 904
 905 }
 906 #else
 907
 908 /* clear is called to tell the fs to release any per-inode data it holds.
 909  * The object might still exist on disk and is just being thrown out of the cache
 910  * or else the object has actually been deleted and we're being called via
 911  * the chain
 912  *   yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
 913  */
 914
 915 static void yaffs_clear_inode(struct inode *inode)
 916 {
 917         yaffs_obj_t *obj;
 918         yaffs_dev_t *dev;
 919
 920         obj = yaffs_InodeToObject(inode);
 921
 922         T(YAFFS_TRACE_OS,
 923                 (TSTR("yaffs_clear_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
 924                 atomic_read(&inode->i_count),
 925                 obj ? "object exists" : "null object"));
 926
 927         if (obj) {
 928                 dev = obj->my_dev;
 929                 yaffs_gross_lock(dev);
 930                 yaffs_unstitch_obj(inode,obj);
 931                 yaffs_gross_unlock(dev);
 932         }
 933
 934 }
 935
 936 /* delete is called when the link count is zero and the inode
 937  * is put (ie. nobody wants to know about it anymore, time to
 938  * delete the file).
 939  * NB Must call clear_inode()
 940  */
 941 static void yaffs_delete_inode(struct inode *inode)
 942 {
 943         yaffs_obj_t *obj = yaffs_InodeToObject(inode);
 944         yaffs_dev_t *dev;
 945
 946         T(YAFFS_TRACE_OS,
 947                 (TSTR("yaffs_delete_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
 948                 atomic_read(&inode->i_count),
 949                 obj ? "object exists" : "null object"));
 950
 951         if (obj) {
 952                 dev = obj->my_dev;
 953                 yaffs_gross_lock(dev);
 954                 yaffs_del_obj(obj);
 955                 yaffs_gross_unlock(dev);
 956         }
 957 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 958         truncate_inode_pages(&inode->i_data, 0);
 959 #endif
 960         clear_inode(inode);
 961 }
 962 #endif
 963
 964
 965 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 966 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 967 #else
 968 static int yaffs_file_flush(struct file *file)
 969 #endif
 970 {
 971         yaffs_obj_t *obj = yaffs_dentry_to_obj(file->f_dentry);
 972
 973         yaffs_dev_t *dev = obj->my_dev;
 974
 975         T(YAFFS_TRACE_OS,
 976                 (TSTR("yaffs_file_flush object %d (%s)\n"), obj->obj_id,
 977                 obj->dirty ? "dirty" : "clean"));
 978
 979         yaffs_gross_lock(dev);
 980
 981         yaffs_flush_file(obj, 1, 0);
 982
 983         yaffs_gross_unlock(dev);
 984
 985         return 0;
 986 }
 987
 988 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 989 {
 990         /* Lifted from jffs2 */
 991
 992         yaffs_obj_t *obj;
 993         unsigned char *pg_buf;
 994         int ret;
 995
 996         yaffs_dev_t *dev;
 997
 998         T(YAFFS_TRACE_OS,
 999                 (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
1000                 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
1001                 (unsigned)PAGE_CACHE_SIZE));
1002
1003         obj = yaffs_dentry_to_obj(f->f_dentry);
1004
1005         dev = obj->my_dev;
1006
1007 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1008         BUG_ON(!PageLocked(pg));
1009 #else
1010         if (!PageLocked(pg))
1011                 PAGE_BUG(pg);
1012 #endif
1013
1014         pg_buf = kmap(pg);
1015         /* FIXME: Can kmap fail? */
1016
1017         yaffs_gross_lock(dev);
1018
1019         ret = yaffs_file_rd(obj, pg_buf,
1020                                 pg->index << PAGE_CACHE_SHIFT,
1021                                 PAGE_CACHE_SIZE);
1022
1023         yaffs_gross_unlock(dev);
1024
1025         if (ret >= 0)
1026                 ret = 0;
1027
1028         if (ret) {
1029                 ClearPageUptodate(pg);
1030                 SetPageError(pg);
1031         } else {
1032                 SetPageUptodate(pg);
1033                 ClearPageError(pg);
1034         }
1035
1036         flush_dcache_page(pg);
1037         kunmap(pg);
1038
1039         T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
1040         return ret;
1041 }
1042
1043 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
1044 {
1045         int ret = yaffs_readpage_nolock(f, pg);
1046         UnlockPage(pg);
1047         return ret;
1048 }
1049
1050 static int yaffs_readpage(struct file *f, struct page *pg)
1051 {
1052         int ret;
1053
1054         T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
1055         ret=yaffs_readpage_unlock(f, pg);
1056         T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
1057         return ret;
1058 }
1059
1060 /* writepage inspired by/stolen from smbfs */
1061
1062 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1063 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
1064 #else
1065 static int yaffs_writepage(struct page *page)
1066 #endif
1067 {
1068         yaffs_dev_t *dev;
1069         struct address_space *mapping = page->mapping;
1070         struct inode *inode;
1071         unsigned long end_index;
1072         char *buffer;
1073         yaffs_obj_t *obj;
1074         int nWritten = 0;
1075         unsigned n_bytes;
1076         loff_t i_size;
1077
1078         if (!mapping)
1079                 BUG();
1080         inode = mapping->host;
1081         if (!inode)
1082                 BUG();
1083         i_size = i_size_read(inode);
1084
1085         end_index = i_size >> PAGE_CACHE_SHIFT;
1086
1087         if(page->index < end_index)
1088                 n_bytes = PAGE_CACHE_SIZE;
1089         else {
1090                 n_bytes = i_size & (PAGE_CACHE_SIZE -1);
1091
1092                 if (page->index > end_index || !n_bytes) {
1093                         T(YAFFS_TRACE_OS,
1094                                 (TSTR("yaffs_writepage at %08x, inode size = %08x!!!\n"),
1095                                 (unsigned)(page->index << PAGE_CACHE_SHIFT),
1096                                 (unsigned)inode->i_size));
1097                         T(YAFFS_TRACE_OS,
1098                                 (TSTR("                -> don't care!!\n")));
1099
1100                         zero_user_segment(page,0,PAGE_CACHE_SIZE);
1101                         set_page_writeback(page);
1102                         unlock_page(page);
1103                         end_page_writeback(page);
1104                         return 0;
1105                 }
1106         }
1107
1108         if(n_bytes != PAGE_CACHE_SIZE)
1109                 zero_user_segment(page,n_bytes,PAGE_CACHE_SIZE);
1110
1111         get_page(page);
1112
1113         buffer = kmap(page);
1114
1115         obj = yaffs_InodeToObject(inode);
1116         dev = obj->my_dev;
1117         yaffs_gross_lock(dev);
1118
1119         T(YAFFS_TRACE_OS,
1120                 (TSTR("yaffs_writepage at %08x, size %08x\n"),
1121                 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes));
1122         T(YAFFS_TRACE_OS,
1123                 (TSTR("writepag0: obj = %05x, ino = %05x\n"),
1124                 (int)obj->variant.file_variant.file_size, (int)inode->i_size));
1125
1126         nWritten = yaffs_wr_file(obj, buffer,
1127                         page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
1128
1129         yaffs_touch_super(dev);
1130
1131         T(YAFFS_TRACE_OS,
1132                 (TSTR("writepag1: obj = %05x, ino = %05x\n"),
1133                 (int)obj->variant.file_variant.file_size, (int)inode->i_size));
1134
1135         yaffs_gross_unlock(dev);
1136
1137         kunmap(page);
1138         set_page_writeback(page);
1139         unlock_page(page);
1140         end_page_writeback(page);
1141         put_page(page);
1142
1143         return (nWritten == n_bytes) ? 0 : -ENOSPC;
1144 }
1145
1146
1147 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1148 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
1149                                 loff_t pos, unsigned len, unsigned flags,
1150                                 struct page **pagep, void **fsdata)
1151 {
1152         struct page *pg = NULL;
1153         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1154
1155         int ret = 0;
1156         int space_held = 0;
1157
1158         /* Get a page */
1159 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
1160         pg = grab_cache_page_write_begin(mapping, index, flags);
1161 #else
1162         pg = __grab_cache_page(mapping, index);
1163 #endif
1164
1165         *pagep = pg;
1166         if (!pg) {
1167                 ret =  -ENOMEM;
1168                 goto out;
1169         }
1170         T(YAFFS_TRACE_OS,
1171                 (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
1172                 (int)index,(int)index,Page_Uptodate(pg) ? 1 : 0));
1173
1174         /* Get fs space */
1175         space_held = yaffs_hold_space(filp);
1176
1177         if (!space_held) {
1178                 ret = -ENOSPC;
1179                 goto out;
1180         }
1181
1182         /* Update page if required */
1183
1184         if (!Page_Uptodate(pg))
1185                 ret = yaffs_readpage_nolock(filp, pg);
1186
1187         if (ret)
1188                 goto out;
1189
1190         /* Happy path return */
1191         T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
1192
1193         return 0;
1194
1195 out:
1196         T(YAFFS_TRACE_OS,
1197                 (TSTR("end yaffs_write_begin fail returning %d\n"), ret));
1198         if (space_held)
1199                 yaffs_release_space(filp);
1200         if (pg) {
1201                 unlock_page(pg);
1202                 page_cache_release(pg);
1203         }
1204         return ret;
1205 }
1206
1207 #else
1208
1209 static int yaffs_prepare_write(struct file *f, struct page *pg,
1210                                 unsigned offset, unsigned to)
1211 {
1212         T(YAFFS_TRACE_OS, (TSTR("yaffs_prepair_write\n")));
1213
1214         if (!Page_Uptodate(pg))
1215                 return yaffs_readpage_nolock(f, pg);
1216         return 0;
1217 }
1218 #endif
1219
1220 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1221 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1222                                 loff_t pos, unsigned len, unsigned copied,
1223                                 struct page *pg, void *fsdadata)
1224 {
1225         int ret = 0;
1226         void *addr, *kva;
1227         uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1228
1229         kva = kmap(pg);
1230         addr = kva + offset_into_page;
1231
1232         T(YAFFS_TRACE_OS,
1233                 ("yaffs_write_end addr %p pos %x n_bytes %d\n",
1234                 addr,(unsigned)pos, copied));
1235
1236         ret = yaffs_file_write(filp, addr, copied, &pos);
1237
1238         if (ret != copied) {
1239                 T(YAFFS_TRACE_OS,
1240                         (TSTR("yaffs_write_end not same size ret %d  copied %d\n"),
1241                         ret, copied));
1242                 SetPageError(pg);
1243         } else {
1244                 /* Nothing */
1245         }
1246
1247         kunmap(pg);
1248
1249         yaffs_release_space(filp);
1250         unlock_page(pg);
1251         page_cache_release(pg);
1252         return ret;
1253 }
1254 #else
1255
1256 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
1257                                 unsigned to)
1258 {
1259         void *addr, *kva;
1260
1261         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
1262         int n_bytes = to - offset;
1263         int nWritten;
1264
1265         unsigned spos = pos;
1266         unsigned saddr;
1267
1268         kva = kmap(pg);
1269         addr = kva + offset;
1270
1271         saddr = (unsigned) addr;
1272
1273         T(YAFFS_TRACE_OS,
1274                 (TSTR("yaffs_commit_write addr %x pos %x n_bytes %d\n"),
1275                 saddr, spos, n_bytes));
1276
1277         nWritten = yaffs_file_write(f, addr, n_bytes, &pos);
1278
1279         if (nWritten != n_bytes) {
1280                 T(YAFFS_TRACE_OS,
1281                         (TSTR("yaffs_commit_write not same size nWritten %d  n_bytes %d\n"),
1282                         nWritten, n_bytes));
1283                 SetPageError(pg);
1284         } else {
1285                 /* Nothing */
1286         }
1287
1288         kunmap(pg);
1289
1290         T(YAFFS_TRACE_OS,
1291                 (TSTR("yaffs_commit_write returning %d\n"),
1292                 nWritten == n_bytes ? 0 : nWritten));
1293
1294         return nWritten == n_bytes ? 0 : nWritten;
1295 }
1296 #endif
1297
1298
1299 static void yaffs_fill_inode_from_obj(struct inode *inode, yaffs_obj_t *obj)
1300 {
1301         if (inode && obj) {
1302
1303
1304                 /* Check mode against the variant type and attempt to repair if broken. */
1305                 __u32 mode = obj->yst_mode;
1306                 switch (obj->variant_type) {
1307                 case YAFFS_OBJECT_TYPE_FILE:
1308                         if (!S_ISREG(mode)) {
1309                                 obj->yst_mode &= ~S_IFMT;
1310                                 obj->yst_mode |= S_IFREG;
1311                         }
1312
1313                         break;
1314                 case YAFFS_OBJECT_TYPE_SYMLINK:
1315                         if (!S_ISLNK(mode)) {
1316                                 obj->yst_mode &= ~S_IFMT;
1317                                 obj->yst_mode |= S_IFLNK;
1318                         }
1319
1320                         break;
1321                 case YAFFS_OBJECT_TYPE_DIRECTORY:
1322                         if (!S_ISDIR(mode)) {
1323                                 obj->yst_mode &= ~S_IFMT;
1324                                 obj->yst_mode |= S_IFDIR;
1325                         }
1326
1327                         break;
1328                 case YAFFS_OBJECT_TYPE_UNKNOWN:
1329                 case YAFFS_OBJECT_TYPE_HARDLINK:
1330                 case YAFFS_OBJECT_TYPE_SPECIAL:
1331                 default:
1332                         /* TODO? */
1333                         break;
1334                 }
1335
1336                 inode->i_flags |= S_NOATIME;
1337
1338                 inode->i_ino = obj->obj_id;
1339                 inode->i_mode = obj->yst_mode;
1340                 inode->i_uid = obj->yst_uid;
1341                 inode->i_gid = obj->yst_gid;
1342 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
1343                 inode->i_blksize = inode->i_sb->s_blocksize;
1344 #endif
1345 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1346
1347                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1348                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1349                 inode->i_atime.tv_nsec = 0;
1350                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1351                 inode->i_mtime.tv_nsec = 0;
1352                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1353                 inode->i_ctime.tv_nsec = 0;
1354 #else
1355                 inode->i_rdev = obj->yst_rdev;
1356                 inode->i_atime = obj->yst_atime;
1357                 inode->i_mtime = obj->yst_mtime;
1358                 inode->i_ctime = obj->yst_ctime;
1359 #endif
1360                 inode->i_size = yaffs_get_obj_length(obj);
1361                 inode->i_blocks = (inode->i_size + 511) >> 9;
1362
1363                 inode->i_nlink = yaffs_get_obj_link_count(obj);
1364
1365                 T(YAFFS_TRACE_OS,
1366                         (TSTR("yaffs_fill_inode mode %x uid %d gid %d size %d count %d\n"),
1367                         inode->i_mode, inode->i_uid, inode->i_gid,
1368                         (int)inode->i_size, atomic_read(&inode->i_count)));
1369
1370                 switch (obj->yst_mode & S_IFMT) {
1371                 default:        /* fifo, device or socket */
1372 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1373                         init_special_inode(inode, obj->yst_mode,
1374                                         old_decode_dev(obj->yst_rdev));
1375 #else
1376                         init_special_inode(inode, obj->yst_mode,
1377                                         (dev_t) (obj->yst_rdev));
1378 #endif
1379                         break;
1380                 case S_IFREG:   /* file */
1381                         inode->i_op = &yaffs_file_inode_operations;
1382                         inode->i_fop = &yaffs_file_operations;
1383                         inode->i_mapping->a_ops =
1384                                 &yaffs_file_address_operations;
1385                         break;
1386                 case S_IFDIR:   /* directory */
1387                         inode->i_op = &yaffs_dir_inode_operations;
1388                         inode->i_fop = &yaffs_dir_operations;
1389                         break;
1390                 case S_IFLNK:   /* symlink */
1391                         inode->i_op = &yaffs_symlink_inode_operations;
1392                         break;
1393                 }
1394
1395                 yaffs_InodeToObjectLV(inode) = obj;
1396
1397                 obj->my_inode = inode;
1398
1399         } else {
1400                 T(YAFFS_TRACE_OS,
1401                         (TSTR("yaffs_FileInode invalid parameters\n")));
1402         }
1403
1404 }
1405
1406 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1407                                 yaffs_obj_t *obj)
1408 {
1409         struct inode *inode;
1410
1411         if (!sb) {
1412                 T(YAFFS_TRACE_OS,
1413                         (TSTR("yaffs_get_inode for NULL super_block!!\n")));
1414                 return NULL;
1415
1416         }
1417
1418         if (!obj) {
1419                 T(YAFFS_TRACE_OS,
1420                         (TSTR("yaffs_get_inode for NULL object!!\n")));
1421                 return NULL;
1422
1423         }
1424
1425         T(YAFFS_TRACE_OS,
1426                 (TSTR("yaffs_get_inode for object %d\n"), obj->obj_id));
1427
1428         inode = Y_IGET(sb, obj->obj_id);
1429         if (IS_ERR(inode))
1430                 return NULL;
1431
1432         /* NB Side effect: iget calls back to yaffs_read_inode(). */
1433         /* iget also increments the inode's i_count */
1434         /* NB You can't be holding grossLock or deadlock will happen! */
1435
1436         return inode;
1437 }
1438
1439 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1440                                 loff_t *pos)
1441 {
1442         yaffs_obj_t *obj;
1443         int nWritten, ipos;
1444         struct inode *inode;
1445         yaffs_dev_t *dev;
1446
1447         obj = yaffs_dentry_to_obj(f->f_dentry);
1448
1449         dev = obj->my_dev;
1450
1451         yaffs_gross_lock(dev);
1452
1453         inode = f->f_dentry->d_inode;
1454
1455         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1456                 ipos = inode->i_size;
1457         else
1458                 ipos = *pos;
1459
1460         if (!obj)
1461                 T(YAFFS_TRACE_OS,
1462                         (TSTR("yaffs_file_write: hey obj is null!\n")));
1463         else
1464                 T(YAFFS_TRACE_OS,
1465                         (TSTR("yaffs_file_write about to write writing %u(%x) bytes"
1466                         "to object %d at %d(%x)\n"),
1467                         (unsigned) n, (unsigned) n, obj->obj_id, ipos,ipos));
1468
1469         nWritten = yaffs_wr_file(obj, buf, ipos, n, 0);
1470
1471         yaffs_touch_super(dev);
1472
1473         T(YAFFS_TRACE_OS,
1474                 (TSTR("yaffs_file_write: %d(%x) bytes written\n"),
1475                 (unsigned )n,(unsigned)n));
1476
1477         if (nWritten > 0) {
1478                 ipos += nWritten;
1479                 *pos = ipos;
1480                 if (ipos > inode->i_size) {
1481                         inode->i_size = ipos;
1482                         inode->i_blocks = (ipos + 511) >> 9;
1483
1484                         T(YAFFS_TRACE_OS,
1485                                 (TSTR("yaffs_file_write size updated to %d bytes, "
1486                                 "%d blocks\n"),
1487                                 ipos, (int)(inode->i_blocks)));
1488                 }
1489
1490         }
1491         yaffs_gross_unlock(dev);
1492         return (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
1493 }
1494
1495 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1496 /* For now we just assume few parallel writes and check against a small number. */
1497 /* Todo: need to do this with a counter to handle parallel reads better */
1498
1499 static ssize_t yaffs_hold_space(struct file *f)
1500 {
1501         yaffs_obj_t *obj;
1502         yaffs_dev_t *dev;
1503
1504         int n_free_chunks;
1505
1506
1507         obj = yaffs_dentry_to_obj(f->f_dentry);
1508
1509         dev = obj->my_dev;
1510
1511         yaffs_gross_lock(dev);
1512
1513         n_free_chunks = yaffs_get_n_free_chunks(dev);
1514
1515         yaffs_gross_unlock(dev);
1516
1517         return (n_free_chunks > 20) ? 1 : 0;
1518 }
1519
1520 static void yaffs_release_space(struct file *f)
1521 {
1522         yaffs_obj_t *obj;
1523         yaffs_dev_t *dev;
1524
1525
1526         obj = yaffs_dentry_to_obj(f->f_dentry);
1527
1528         dev = obj->my_dev;
1529
1530         yaffs_gross_lock(dev);
1531
1532
1533         yaffs_gross_unlock(dev);
1534 }
1535
1536
1537 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
1538 {
1539         long long retval;
1540
1541         lock_kernel();
1542
1543         switch (origin){
1544         case 2:
1545                 offset += i_size_read(file->f_path.dentry->d_inode);
1546                 break;
1547         case 1:
1548                 offset += file->f_pos;
1549         }
1550         retval = -EINVAL;
1551
1552         if (offset >= 0){
1553                 if (offset != file->f_pos)
1554                         file->f_pos = offset;
1555
1556                 retval = offset;
1557         }
1558         unlock_kernel();
1559         return retval;
1560 }
1561
1562
1563 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1564 {
1565         yaffs_obj_t *obj;
1566         yaffs_dev_t *dev;
1567         struct yaffs_SearchContext *sc;
1568         struct inode *inode = f->f_dentry->d_inode;
1569         unsigned long offset, curoffs;
1570         yaffs_obj_t *l;
1571         int retVal = 0;
1572
1573         char name[YAFFS_MAX_NAME_LENGTH + 1];
1574
1575         obj = yaffs_dentry_to_obj(f->f_dentry);
1576         dev = obj->my_dev;
1577
1578         yaffs_gross_lock(dev);
1579
1580         yaffs_dev_to_lc(dev)->readdirProcess = current;
1581
1582         offset = f->f_pos;
1583
1584         sc = yaffs_NewSearch(obj);
1585         if(!sc){
1586                 retVal = -ENOMEM;
1587                 goto out;
1588         }
1589
1590         T(YAFFS_TRACE_OS, (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
1591
1592         if (offset == 0) {
1593                 T(YAFFS_TRACE_OS,
1594                         (TSTR("yaffs_readdir: entry . ino %d \n"),
1595                         (int)inode->i_ino));
1596                 yaffs_gross_unlock(dev);
1597                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0){
1598                         yaffs_gross_lock(dev);
1599                         goto out;
1600                 }
1601                 yaffs_gross_lock(dev);
1602                 offset++;
1603                 f->f_pos++;
1604         }
1605         if (offset == 1) {
1606                 T(YAFFS_TRACE_OS,
1607                         (TSTR("yaffs_readdir: entry .. ino %d \n"),
1608                         (int)f->f_dentry->d_parent->d_inode->i_ino));
1609                 yaffs_gross_unlock(dev);
1610                 if (filldir(dirent, "..", 2, offset,
1611                         f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0){
1612                         yaffs_gross_lock(dev);
1613                         goto out;
1614                 }
1615                 yaffs_gross_lock(dev);
1616                 offset++;
1617                 f->f_pos++;
1618         }
1619
1620         curoffs = 1;
1621
1622         /* If the directory has changed since the open or last call to
1623            readdir, rewind to after the 2 canned entries. */
1624         if (f->f_version != inode->i_version) {
1625                 offset = 2;
1626                 f->f_pos = offset;
1627                 f->f_version = inode->i_version;
1628         }
1629
1630         while(sc->nextReturn){
1631                 curoffs++;
1632                 l = sc->nextReturn;
1633                 if (curoffs >= offset) {
1634                         int this_inode = yaffs_get_obj_inode(l);
1635                         int this_type = yaffs_get_obj_type(l);
1636
1637                         yaffs_get_obj_name(l, name,
1638                                             YAFFS_MAX_NAME_LENGTH + 1);
1639                         T(YAFFS_TRACE_OS,
1640                           (TSTR("yaffs_readdir: %s inode %d\n"),
1641                           name, yaffs_get_obj_inode(l)));
1642
1643                         yaffs_gross_unlock(dev);
1644
1645                         if (filldir(dirent,
1646                                         name,
1647                                         strlen(name),
1648                                         offset,
1649                                         this_inode,
1650                                         this_type) < 0){
1651                                 yaffs_gross_lock(dev);
1652                                 goto out;
1653                         }
1654
1655                         yaffs_gross_lock(dev);
1656
1657                         offset++;
1658                         f->f_pos++;
1659                 }
1660                 yaffs_search_advance(sc);
1661         }
1662
1663 out:
1664         yaffs_search_end(sc);
1665         yaffs_dev_to_lc(dev)->readdirProcess = NULL;
1666         yaffs_gross_unlock(dev);
1667
1668         return retVal;
1669 }
1670
1671
1672
1673 /*
1674  * File creation. Allocate an inode, and we're done..
1675  */
1676
1677 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1678 #define YCRED(x) x
1679 #else
1680 #define YCRED(x) (x->cred)
1681 #endif
1682
1683 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1684 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1685                         dev_t rdev)
1686 #else
1687 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1688                         int rdev)
1689 #endif
1690 {
1691         struct inode *inode;
1692
1693         yaffs_obj_t *obj = NULL;
1694         yaffs_dev_t *dev;
1695
1696         yaffs_obj_t *parent = yaffs_InodeToObject(dir);
1697
1698         int error = -ENOSPC;
1699         uid_t uid = YCRED(current)->fsuid;
1700         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1701
1702         if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1703                 mode |= S_ISGID;
1704
1705         if (parent) {
1706                 T(YAFFS_TRACE_OS,
1707                         (TSTR("yaffs_mknod: parent object %d type %d\n"),
1708                         parent->obj_id, parent->variant_type));
1709         } else {
1710                 T(YAFFS_TRACE_OS,
1711                         (TSTR("yaffs_mknod: could not get parent object\n")));
1712                 return -EPERM;
1713         }
1714
1715         T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
1716                         "mode %x dev %x\n"),
1717                         dentry->d_name.name, mode, rdev));
1718
1719         dev = parent->my_dev;
1720
1721         yaffs_gross_lock(dev);
1722
1723         switch (mode & S_IFMT) {
1724         default:
1725                 /* Special (socket, fifo, device...) */
1726                 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
1727 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1728                 obj = yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1729                                 gid, old_encode_dev(rdev));
1730 #else
1731                 obj = yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1732                                 gid, rdev);
1733 #endif
1734                 break;
1735         case S_IFREG:           /* file          */
1736                 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
1737                 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
1738                                 gid);
1739                 break;
1740         case S_IFDIR:           /* directory */
1741                 T(YAFFS_TRACE_OS,
1742                         (TSTR("yaffs_mknod: making directory\n")));
1743                 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
1744                                         uid, gid);
1745                 break;
1746         case S_IFLNK:           /* symlink */
1747                 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
1748                 obj = NULL;     /* Do we ever get here? */
1749                 break;
1750         }
1751
1752         /* Can not call yaffs_get_inode() with gross lock held */
1753         yaffs_gross_unlock(dev);
1754
1755         if (obj) {
1756                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1757                 d_instantiate(dentry, inode);
1758                 update_dir_time(dir);
1759                 T(YAFFS_TRACE_OS,
1760                         (TSTR("yaffs_mknod created object %d count = %d\n"),
1761                         obj->obj_id, atomic_read(&inode->i_count)));
1762                 error = 0;
1763                 yaffs_fill_inode_from_obj(dir,parent);
1764         } else {
1765                 T(YAFFS_TRACE_OS,
1766                         (TSTR("yaffs_mknod failed making object\n")));
1767                 error = -ENOMEM;
1768         }
1769
1770         return error;
1771 }
1772
1773 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1774 {
1775         int retVal;
1776         T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
1777         retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1778         return retVal;
1779 }
1780
1781 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1782 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1783                         struct nameidata *n)
1784 #else
1785 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1786 #endif
1787 {
1788         T(YAFFS_TRACE_OS,(TSTR("yaffs_create\n")));
1789         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1790 }
1791
1792 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1793 {
1794         int retVal;
1795
1796         yaffs_dev_t *dev;
1797         yaffs_obj_t *obj;
1798
1799         T(YAFFS_TRACE_OS,
1800                 (TSTR("yaffs_unlink %d:%s\n"),
1801                 (int)(dir->i_ino),
1802                 dentry->d_name.name));
1803         obj = yaffs_InodeToObject(dir);
1804         dev = obj->my_dev;
1805
1806         yaffs_gross_lock(dev);
1807
1808         retVal = yaffs_unlinker(obj, dentry->d_name.name);
1809
1810         if (retVal == YAFFS_OK) {
1811                 dentry->d_inode->i_nlink--;
1812                 dir->i_version++;
1813                 yaffs_gross_unlock(dev);
1814                 mark_inode_dirty(dentry->d_inode);
1815                 update_dir_time(dir);
1816                 return 0;
1817         }
1818         yaffs_gross_unlock(dev);
1819         return -ENOTEMPTY;
1820 }
1821
1822 /*
1823  * Create a link...
1824  */
1825 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1826                         struct dentry *dentry)
1827 {
1828         struct inode *inode = old_dentry->d_inode;
1829         yaffs_obj_t *obj = NULL;
1830         yaffs_obj_t *link = NULL;
1831         yaffs_dev_t *dev;
1832
1833         T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
1834
1835         obj = yaffs_InodeToObject(inode);
1836         dev = obj->my_dev;
1837
1838         yaffs_gross_lock(dev);
1839
1840         if (!S_ISDIR(inode->i_mode))            /* Don't link directories */
1841                 link = yaffs_link_obj(yaffs_InodeToObject(dir), dentry->d_name.name,
1842                         obj);
1843
1844         if (link) {
1845                 old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
1846                 d_instantiate(dentry, old_dentry->d_inode);
1847                 atomic_inc(&old_dentry->d_inode->i_count);
1848                 T(YAFFS_TRACE_OS,
1849                         (TSTR("yaffs_link link count %d i_count %d\n"),
1850                         old_dentry->d_inode->i_nlink,
1851                         atomic_read(&old_dentry->d_inode->i_count)));
1852         }
1853
1854         yaffs_gross_unlock(dev);
1855
1856         if (link){
1857                 update_dir_time(dir);
1858                 return 0;
1859         }
1860
1861         return -EPERM;
1862 }
1863
1864 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1865                                 const char *symname)
1866 {
1867         yaffs_obj_t *obj;
1868         yaffs_dev_t *dev;
1869         uid_t uid = YCRED(current)->fsuid;
1870         gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1871
1872         T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
1873
1874         dev = yaffs_InodeToObject(dir)->my_dev;
1875         yaffs_gross_lock(dev);
1876         obj = yaffs_create_symlink(yaffs_InodeToObject(dir), dentry->d_name.name,
1877                                 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1878         yaffs_gross_unlock(dev);
1879
1880         if (obj) {
1881                 struct inode *inode;
1882
1883                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1884                 d_instantiate(dentry, inode);
1885                 update_dir_time(dir);
1886                 T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
1887                 return 0;
1888         } else {
1889                 T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
1890         }
1891
1892         return -ENOMEM;
1893 }
1894
1895 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1896 static int yaffs_sync_object(struct file *file, int datasync)
1897 #else
1898 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1899                                 int datasync)
1900 #endif
1901 {
1902
1903         yaffs_obj_t *obj;
1904         yaffs_dev_t *dev;
1905 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1906         struct dentry *dentry = file->f_path.dentry;
1907 #endif
1908
1909         obj = yaffs_dentry_to_obj(dentry);
1910
1911         dev = obj->my_dev;
1912
1913         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1914                 (TSTR("yaffs_sync_object\n")));
1915         yaffs_gross_lock(dev);
1916         yaffs_flush_file(obj, 1, datasync);
1917         yaffs_gross_unlock(dev);
1918         return 0;
1919 }
1920
1921 /*
1922  * The VFS layer already does all the dentry stuff for rename.
1923  *
1924  * NB: POSIX says you can rename an object over an old object of the same name
1925  */
1926 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1927                         struct inode *new_dir, struct dentry *new_dentry)
1928 {
1929         yaffs_dev_t *dev;
1930         int retVal = YAFFS_FAIL;
1931         yaffs_obj_t *target;
1932
1933         T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
1934         dev = yaffs_InodeToObject(old_dir)->my_dev;
1935
1936         yaffs_gross_lock(dev);
1937
1938         /* Check if the target is an existing directory that is not empty. */
1939         target = yaffs_find_by_name(yaffs_InodeToObject(new_dir),
1940                                 new_dentry->d_name.name);
1941
1942
1943
1944         if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1945                 !ylist_empty(&target->variant.dir_variant.children)) {
1946
1947                 T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
1948
1949                 retVal = YAFFS_FAIL;
1950         } else {
1951                 /* Now does unlinking internally using shadowing mechanism */
1952                 T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n")));
1953
1954                 retVal = yaffs_rename_obj(yaffs_InodeToObject(old_dir),
1955                                 old_dentry->d_name.name,
1956                                 yaffs_InodeToObject(new_dir),
1957                                 new_dentry->d_name.name);
1958         }
1959         yaffs_gross_unlock(dev);
1960
1961         if (retVal == YAFFS_OK) {
1962                 if (target) {
1963                         new_dentry->d_inode->i_nlink--;
1964                         mark_inode_dirty(new_dentry->d_inode);
1965                 }
1966
1967                 update_dir_time(old_dir);
1968                 if(old_dir != new_dir)
1969                         update_dir_time(new_dir);
1970                 return 0;
1971         } else {
1972                 return -ENOTEMPTY;
1973         }
1974 }
1975
1976 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1977 {
1978         struct inode *inode = dentry->d_inode;
1979         int error = 0;
1980         yaffs_dev_t *dev;
1981
1982         T(YAFFS_TRACE_OS,
1983                 (TSTR("yaffs_setattr of object %d\n"),
1984                 yaffs_InodeToObject(inode)->obj_id));
1985
1986         /* Fail if a requested resize >= 2GB */
1987         if (attr->ia_valid & ATTR_SIZE &&
1988                 (attr->ia_size >> 31))
1989                 error = -EINVAL;
1990
1991         if (error == 0)
1992                 error = inode_change_ok(inode, attr);
1993         if (error == 0) {
1994                 int result;
1995                 if (!error){
1996                         error = yaffs_vfs_setattr(inode, attr);
1997                         T(YAFFS_TRACE_OS,(TSTR("inode_setattr called\n")));
1998                         if (attr->ia_valid & ATTR_SIZE){
1999                                 yaffs_vfs_setsize(inode,attr->ia_size);
2000                                 inode->i_blocks = (inode->i_size + 511) >> 9;
2001                         }
2002                 }
2003                 dev = yaffs_InodeToObject(inode)->my_dev;
2004                 if (attr->ia_valid & ATTR_SIZE){
2005                         T(YAFFS_TRACE_OS,(TSTR("resize to %d(%x)\n"),
2006                                 (int)(attr->ia_size),(int)(attr->ia_size)));
2007                 }
2008                 yaffs_gross_lock(dev);
2009                 result = yaffs_set_attribs(yaffs_InodeToObject(inode), attr);
2010                 if(result == YAFFS_OK) {
2011                         error = 0;
2012                 } else {
2013                         error = -EPERM;
2014                 }
2015                 yaffs_gross_unlock(dev);
2016
2017         }
2018
2019         T(YAFFS_TRACE_OS,
2020                 (TSTR("yaffs_setattr done returning %d\n"),error));
2021
2022         return error;
2023 }
2024
2025 #ifdef CONFIG_YAFFS_XATTR
2026 int yaffs_setxattr(struct dentry *dentry, const char *name,
2027                         const void *value, size_t size, int flags)
2028 {
2029         struct inode *inode = dentry->d_inode;
2030         int error = 0;
2031         yaffs_dev_t *dev;
2032         yaffs_obj_t *obj = yaffs_InodeToObject(inode);
2033
2034         T(YAFFS_TRACE_OS,
2035                 (TSTR("yaffs_setxattr of object %d\n"),
2036                 obj->obj_id));
2037
2038
2039         if (error == 0) {
2040                 int result;
2041                 dev = obj->my_dev;
2042                 yaffs_gross_lock(dev);
2043                 result = yaffs_set_xattrib(obj, name, value, size, flags);
2044                 if(result == YAFFS_OK)
2045                         error = 0;
2046                 else if(result < 0)
2047                         error = result;
2048                 yaffs_gross_unlock(dev);
2049
2050         }
2051         T(YAFFS_TRACE_OS,
2052                 (TSTR("yaffs_setxattr done returning %d\n"),error));
2053
2054         return error;
2055 }
2056
2057
2058 ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
2059                         size_t size)
2060 {
2061         struct inode *inode = dentry->d_inode;
2062         int error = 0;
2063         yaffs_dev_t *dev;
2064         yaffs_obj_t *obj = yaffs_InodeToObject(inode);
2065
2066         T(YAFFS_TRACE_OS,
2067                 (TSTR("yaffs_getxattr \"%s\" from object %d\n"),
2068                 name, obj->obj_id));
2069
2070         if (error == 0) {
2071                 dev = obj->my_dev;
2072                 yaffs_gross_lock(dev);
2073                 error = yaffs_get_xattrib(obj, name, buff, size);
2074                 yaffs_gross_unlock(dev);
2075
2076         }
2077         T(YAFFS_TRACE_OS,
2078                 (TSTR("yaffs_getxattr done returning %d\n"),error));
2079
2080         return error;
2081 }
2082
2083 int yaffs_removexattr(struct dentry *dentry, const char *name)
2084 {
2085         struct inode *inode = dentry->d_inode;
2086         int error = 0;
2087         yaffs_dev_t *dev;
2088         yaffs_obj_t *obj = yaffs_InodeToObject(inode);
2089
2090         T(YAFFS_TRACE_OS,
2091                 (TSTR("yaffs_removexattr of object %d\n"),
2092                 obj->obj_id));
2093
2094
2095         if (error == 0) {
2096                 int result;
2097                 dev = obj->my_dev;
2098                 yaffs_gross_lock(dev);
2099                 result = yaffs_remove_xattrib(obj, name);
2100                 if(result == YAFFS_OK)
2101                         error = 0;
2102                 else if(result < 0)
2103                         error = result;
2104                 yaffs_gross_unlock(dev);
2105
2106         }
2107         T(YAFFS_TRACE_OS,
2108                 (TSTR("yaffs_removexattr done returning %d\n"),error));
2109
2110         return error;
2111 }
2112
2113 ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
2114 {
2115         struct inode *inode = dentry->d_inode;
2116         int error = 0;
2117         yaffs_dev_t *dev;
2118         yaffs_obj_t *obj = yaffs_InodeToObject(inode);
2119
2120         T(YAFFS_TRACE_OS,
2121                 (TSTR("yaffs_listxattr of object %d\n"),
2122                 obj->obj_id));
2123
2124
2125         if (error == 0) {
2126                 dev = obj->my_dev;
2127                 yaffs_gross_lock(dev);
2128                 error = yaffs_list_xattrib(obj, buff, size);
2129                 yaffs_gross_unlock(dev);
2130
2131         }
2132         T(YAFFS_TRACE_OS,
2133                 (TSTR("yaffs_listxattr done returning %d\n"),error));
2134
2135         return error;
2136 }
2137
2138 #endif
2139
2140
2141 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2142 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
2143 {
2144         yaffs_dev_t *dev = yaffs_dentry_to_obj(dentry)->my_dev;
2145         struct super_block *sb = dentry->d_sb;
2146 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2147 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
2148 {
2149         yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2150 #else
2151 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
2152 {
2153         yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2154 #endif
2155
2156         T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n")));
2157
2158         yaffs_gross_lock(dev);
2159
2160         buf->f_type = YAFFS_MAGIC;
2161         buf->f_bsize = sb->s_blocksize;
2162         buf->f_namelen = 255;
2163
2164         if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
2165                 /* Do this if chunk size is not a power of 2 */
2166
2167                 uint64_t bytesInDev;
2168                 uint64_t bytesFree;
2169
2170                 bytesInDev = ((uint64_t)((dev->param.end_block - dev->param.start_block + 1))) *
2171                         ((uint64_t)(dev->param.chunks_per_block * dev->data_bytes_per_chunk));
2172
2173                 do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
2174                 buf->f_blocks = bytesInDev;
2175
2176                 bytesFree  = ((uint64_t)(yaffs_get_n_free_chunks(dev))) *
2177                         ((uint64_t)(dev->data_bytes_per_chunk));
2178
2179                 do_div(bytesFree, sb->s_blocksize);
2180
2181                 buf->f_bfree = bytesFree;
2182
2183         } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
2184
2185                 buf->f_blocks =
2186                         (dev->param.end_block - dev->param.start_block + 1) *
2187                         dev->param.chunks_per_block /
2188                         (sb->s_blocksize / dev->data_bytes_per_chunk);
2189                 buf->f_bfree =
2190                         yaffs_get_n_free_chunks(dev) /
2191                         (sb->s_blocksize / dev->data_bytes_per_chunk);
2192         } else {
2193                 buf->f_blocks =
2194                         (dev->param.end_block - dev->param.start_block + 1) *
2195                         dev->param.chunks_per_block *
2196                         (dev->data_bytes_per_chunk / sb->s_blocksize);
2197
2198                 buf->f_bfree =
2199                         yaffs_get_n_free_chunks(dev) *
2200                         (dev->data_bytes_per_chunk / sb->s_blocksize);
2201         }
2202
2203         buf->f_files = 0;
2204         buf->f_ffree = 0;
2205         buf->f_bavail = buf->f_bfree;
2206
2207         yaffs_gross_unlock(dev);
2208         return 0;
2209 }
2210
2211
2212
2213 static void yaffs_flush_inodes(struct super_block *sb)
2214 {
2215         struct inode *iptr;
2216         yaffs_obj_t *obj;
2217
2218         list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
2219                 obj = yaffs_InodeToObject(iptr);
2220                 if(obj){
2221                         T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"),
2222                                 obj->obj_id));
2223                         yaffs_flush_file(obj,1,0);
2224                 }
2225         }
2226 }
2227
2228
2229 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
2230 {
2231         yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2232         if(!dev)
2233                 return;
2234
2235         yaffs_flush_inodes(sb);
2236         yaffs_update_dirty_dirs(dev);
2237         yaffs_flush_whole_cache(dev);
2238         if(do_checkpoint)
2239                 yaffs_checkpoint_save(dev);
2240 }
2241
2242
2243 static unsigned yaffs_bg_gc_urgency(yaffs_dev_t *dev)
2244 {
2245         unsigned erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block;
2246         struct yaffs_LinuxContext *context = yaffs_dev_to_lc(dev);
2247         unsigned scatteredFree = 0; /* Free chunks not in an erased block */
2248
2249         if(erasedChunks < dev->n_free_chunks)
2250                 scatteredFree = (dev->n_free_chunks - erasedChunks);
2251
2252         if(!context->bgRunning)
2253                 return 0;
2254         else if(scatteredFree < (dev->param.chunks_per_block * 2))
2255                 return 0;
2256         else if(erasedChunks > dev->n_free_chunks/2)
2257                 return 0;
2258         else if(erasedChunks > dev->n_free_chunks/4)
2259                 return 1;
2260         else
2261                 return 2;
2262 }
2263
2264 static int yaffs_do_sync_fs(struct super_block *sb,
2265                                 int request_checkpoint)
2266 {
2267
2268         yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2269         unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
2270         unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
2271         int do_checkpoint;
2272
2273         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2274                 (TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"),
2275                 gc_urgent,
2276                 sb->s_dirt ? "dirty" : "clean",
2277                 request_checkpoint ? "checkpoint requested" : "no checkpoint",
2278                 oneshot_checkpoint ? " one-shot" : "" ));
2279
2280         yaffs_gross_lock(dev);
2281         do_checkpoint = ((request_checkpoint && !gc_urgent) ||
2282                         oneshot_checkpoint) &&
2283                         !dev->is_checkpointed;
2284
2285         if (sb->s_dirt || do_checkpoint) {
2286                 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
2287                 sb->s_dirt = 0;
2288                 if(oneshot_checkpoint)
2289                         yaffs_auto_checkpoint &= ~4;
2290         }
2291         yaffs_gross_unlock(dev);
2292
2293         return 0;
2294 }
2295
2296 /*
2297  * yaffs background thread functions .
2298  * yaffs_bg_thread_fn() the thread function
2299  * yaffs_bg_start() launches the background thread.
2300  * yaffs_bg_stop() cleans up the background thread.
2301  *
2302  * NB:
2303  * The thread should only run after the yaffs is initialised
2304  * The thread should be stopped before yaffs is unmounted.
2305  * The thread should not do any writing while the fs is in read only.
2306  */
2307
2308 #ifdef YAFFS_COMPILE_BACKGROUND
2309
2310 void yaffs_background_waker(unsigned long data)
2311 {
2312         wake_up_process((struct task_struct *)data);
2313 }
2314
2315 static int yaffs_bg_thread_fn(void *data)
2316 {
2317         yaffs_dev_t *dev = (yaffs_dev_t *)data;
2318         struct yaffs_LinuxContext *context = yaffs_dev_to_lc(dev);
2319         unsigned long now = jiffies;
2320         unsigned long next_dir_update = now;
2321         unsigned long next_gc = now;
2322         unsigned long expires;
2323         unsigned int urgency;
2324
2325         int gcResult;
2326         struct timer_list timer;
2327
2328         T(YAFFS_TRACE_BACKGROUND,
2329                 (TSTR("yaffs_background starting for dev %p\n"),
2330                 (void *)dev));
2331
2332 #ifdef YAFFS_COMPILE_FREEZER
2333         set_freezable();
2334 #endif
2335         while(context->bgRunning){
2336                 T(YAFFS_TRACE_BACKGROUND,
2337                         (TSTR("yaffs_background\n")));
2338
2339                 if(kthread_should_stop())
2340                         break;
2341
2342 #ifdef YAFFS_COMPILE_FREEZER
2343                 if(try_to_freeze())
2344                         continue;
2345 #endif
2346                 yaffs_gross_lock(dev);
2347
2348                 now = jiffies;
2349
2350                 if(time_after(now, next_dir_update) && yaffs_bg_enable){
2351                         yaffs_update_dirty_dirs(dev);
2352                         next_dir_update = now + HZ;
2353                 }
2354
2355                 if(time_after(now,next_gc) && yaffs_bg_enable){
2356                         if(!dev->is_checkpointed){
2357                                 urgency = yaffs_bg_gc_urgency(dev);
2358                                 gcResult = yaffs_bg_gc(dev, urgency);
2359                                 if(urgency > 1)
2360                                         next_gc = now + HZ/20+1;
2361                                 else if(urgency > 0)
2362                                         next_gc = now + HZ/10+1;
2363                                 else
2364                                         next_gc = now + HZ * 2;
2365                         } else /*
2366                                 * gc not running so set to next_dir_update
2367                                 * to cut down on wake ups
2368                                 */
2369                                 next_gc = next_dir_update;
2370                 }
2371                 yaffs_gross_unlock(dev);
2372 #if 1
2373                 expires = next_dir_update;
2374                 if (time_before(next_gc,expires))
2375                         expires = next_gc;
2376                 if(time_before(expires,now))
2377                         expires = now + HZ;
2378
2379                 Y_INIT_TIMER(&timer);
2380                 timer.expires = expires+1;
2381                 timer.data = (unsigned long) current;
2382                 timer.function = yaffs_background_waker;
2383
2384                 set_current_state(TASK_INTERRUPTIBLE);
2385                 add_timer(&timer);
2386                 schedule();
2387                 del_timer_sync(&timer);
2388 #else
2389                 msleep(10);
2390 #endif
2391         }
2392
2393         return 0;
2394 }
2395
2396 static int yaffs_bg_start(yaffs_dev_t *dev)
2397 {
2398         int retval = 0;
2399         struct yaffs_LinuxContext *context = yaffs_dev_to_lc(dev);
2400
2401         if(dev->read_only)
2402                 return -1;
2403
2404         context->bgRunning = 1;
2405
2406         context->bgThread = kthread_run(yaffs_bg_thread_fn,
2407                                 (void *)dev,"yaffs-bg-%d",context->mount_id);
2408
2409         if(IS_ERR(context->bgThread)){
2410                 retval = PTR_ERR(context->bgThread);
2411                 context->bgThread = NULL;
2412                 context->bgRunning = 0;
2413         }
2414         return retval;
2415 }
2416
2417 static void yaffs_bg_stop(yaffs_dev_t *dev)
2418 {
2419         struct yaffs_LinuxContext *ctxt = yaffs_dev_to_lc(dev);
2420
2421         ctxt->bgRunning = 0;
2422
2423         if( ctxt->bgThread){
2424                 kthread_stop(ctxt->bgThread);
2425                 ctxt->bgThread = NULL;
2426         }
2427 }
2428 #else
2429 static int yaffs_bg_thread_fn(void *data)
2430 {
2431         return 0;
2432 }
2433
2434 static int yaffs_bg_start(yaffs_dev_t *dev)
2435 {
2436         return 0;
2437 }
2438
2439 static void yaffs_bg_stop(yaffs_dev_t *dev)
2440 {
2441 }
2442 #endif
2443
2444
2445 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2446 static void yaffs_write_super(struct super_block *sb)
2447 #else
2448 static int yaffs_write_super(struct super_block *sb)
2449 #endif
2450 {
2451         unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2452
2453         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2454                 (TSTR("yaffs_write_super%s\n"),
2455                 request_checkpoint ? " checkpt" : ""));
2456
2457         yaffs_do_sync_fs(sb, request_checkpoint);
2458
2459 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
2460         return 0;
2461 #endif
2462 }
2463
2464
2465 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2466 static int yaffs_sync_fs(struct super_block *sb, int wait)
2467 #else
2468 static int yaffs_sync_fs(struct super_block *sb)
2469 #endif
2470 {
2471         unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2472
2473         T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2474                 (TSTR("yaffs_sync_fs%s\n"),
2475                 request_checkpoint ? " checkpt" : ""));
2476
2477         yaffs_do_sync_fs(sb, request_checkpoint);
2478
2479         return 0;
2480 }
2481
2482 #ifdef YAFFS_USE_OWN_IGET
2483
2484 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
2485 {
2486         struct inode *inode;
2487         yaffs_obj_t *obj;
2488         yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2489
2490         T(YAFFS_TRACE_OS,
2491                 (TSTR("yaffs_iget for %lu\n"), ino));
2492
2493         inode = iget_locked(sb, ino);
2494         if (!inode)
2495                 return ERR_PTR(-ENOMEM);
2496         if (!(inode->i_state & I_NEW))
2497                 return inode;
2498
2499         /* NB This is called as a side effect of other functions, but
2500          * we had to release the lock to prevent deadlocks, so
2501          * need to lock again.
2502          */
2503
2504         yaffs_gross_lock(dev);
2505
2506         obj = yaffs_find_by_number(dev, inode->i_ino);
2507
2508         yaffs_fill_inode_from_obj(inode, obj);
2509
2510         yaffs_gross_unlock(dev);
2511
2512         unlock_new_inode(inode);
2513         return inode;
2514 }
2515
2516 #else
2517
2518 static void yaffs_read_inode(struct inode *inode)
2519 {
2520         /* NB This is called as a side effect of other functions, but
2521          * we had to release the lock to prevent deadlocks, so
2522          * need to lock again.
2523          */
2524
2525         yaffs_obj_t *obj;
2526         yaffs_dev_t *dev = yaffs_SuperToDevice(inode->i_sb);
2527
2528         T(YAFFS_TRACE_OS,
2529                 (TSTR("yaffs_read_inode for %d\n"), (int)inode->i_ino));
2530
2531         if(current != yaffs_dev_to_lc(dev)->readdirProcess)
2532                 yaffs_gross_lock(dev);
2533
2534         obj = yaffs_find_by_number(dev, inode->i_ino);
2535
2536         yaffs_fill_inode_from_obj(inode, obj);
2537
2538         if(current != yaffs_dev_to_lc(dev)->readdirProcess)
2539                 yaffs_gross_unlock(dev);
2540 }
2541
2542 #endif
2543
2544 static YLIST_HEAD(yaffs_context_list);
2545 struct semaphore yaffs_context_lock;
2546
2547 static void yaffs_put_super(struct super_block *sb)
2548 {
2549         yaffs_dev_t *dev = yaffs_SuperToDevice(sb);
2550
2551         T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
2552
2553         T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2554                 (TSTR("Shutting down yaffs background thread\n")));
2555         yaffs_bg_stop(dev);
2556         T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2557                 (TSTR("yaffs background thread shut down\n")));
2558
2559         yaffs_gross_lock(dev);
2560
2561         yaffs_flush_super(sb,1);
2562
2563         if (yaffs_dev_to_lc(dev)->putSuperFunc)
2564                 yaffs_dev_to_lc(dev)->putSuperFunc(sb);
2565
2566
2567         yaffs_deinitialise(dev);
2568
2569         yaffs_gross_unlock(dev);
2570
2571         down(&yaffs_context_lock);
2572         ylist_del_init(&(yaffs_dev_to_lc(dev)->contextList));
2573         up(&yaffs_context_lock);
2574
2575         if (yaffs_dev_to_lc(dev)->spareBuffer) {
2576                 YFREE(yaffs_dev_to_lc(dev)->spareBuffer);
2577                 yaffs_dev_to_lc(dev)->spareBuffer = NULL;
2578         }
2579
2580         kfree(dev);
2581 }
2582
2583
2584 static void yaffs_MTDPutSuper(struct super_block *sb)
2585 {
2586         struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_SuperToDevice(sb));
2587
2588         if (mtd->sync)
2589                 mtd->sync(mtd);
2590
2591         put_mtd_device(mtd);
2592 }
2593
2594
2595 static void yaffs_touch_super(yaffs_dev_t *dev)
2596 {
2597         struct super_block *sb = yaffs_dev_to_lc(dev)->superBlock;
2598
2599         T(YAFFS_TRACE_OS, (TSTR("yaffs_touch_super() sb = %p\n"), sb));
2600         if (sb)
2601                 sb->s_dirt = 1;
2602 }
2603
2604 typedef struct {
2605         int inband_tags;
2606         int skip_checkpoint_read;
2607         int skip_checkpoint_write;
2608         int no_cache;
2609         int tags_ecc_on;
2610         int tags_ecc_overridden;
2611         int lazy_loading_enabled;
2612         int lazy_loading_overridden;
2613         int empty_lost_and_found;
2614         int empty_lost_and_found_overridden;
2615 } yaffs_options;
2616
2617 #define MAX_OPT_LEN 30
2618 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
2619 {
2620         char cur_opt[MAX_OPT_LEN + 1];
2621         int p;
2622         int error = 0;
2623
2624         /* Parse through the options which is a comma seperated list */
2625
2626         while (options_str && *options_str && !error) {
2627                 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2628                 p = 0;
2629
2630                 while(*options_str == ',')
2631                         options_str++;
2632
2633                 while (*options_str && *options_str != ',') {
2634                         if (p < MAX_OPT_LEN) {
2635                                 cur_opt[p] = *options_str;
2636                                 p++;
2637                         }
2638                         options_str++;
2639                 }
2640
2641                 if (!strcmp(cur_opt, "inband-tags"))
2642                         options->inband_tags = 1;
2643                 else if (!strcmp(cur_opt, "tags-ecc-off")){
2644                         options->tags_ecc_on = 0;
2645                         options->tags_ecc_overridden=1;
2646                 } else if (!strcmp(cur_opt, "tags-ecc-on")){
2647                         options->tags_ecc_on = 1;
2648                         options->tags_ecc_overridden = 1;
2649                 } else if (!strcmp(cur_opt, "lazy-loading-off")){
2650                         options->lazy_loading_enabled = 0;
2651                         options->lazy_loading_overridden=1;
2652                 } else if (!strcmp(cur_opt, "lazy-loading-on")){
2653                         options->lazy_loading_enabled = 1;
2654                         options->lazy_loading_overridden = 1;
2655                 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")){
2656                         options->empty_lost_and_found = 0;
2657                         options->empty_lost_and_found_overridden=1;
2658                 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")){
2659                         options->empty_lost_and_found = 1;
2660                         options->empty_lost_and_found_overridden=1;
2661                 } else if (!strcmp(cur_opt, "no-cache"))
2662                         options->no_cache = 1;
2663                 else if (!strcmp(cur_opt, "no-checkpoint-read"))
2664                         options->skip_checkpoint_read = 1;
2665                 else if (!strcmp(cur_opt, "no-checkpoint-write"))
2666                         options->skip_checkpoint_write = 1;
2667                 else if (!strcmp(cur_opt, "no-checkpoint")) {
2668                         options->skip_checkpoint_read = 1;
2669                         options->skip_checkpoint_write = 1;
2670                 } else {
2671                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2672                                         cur_opt);
2673                         error = 1;
2674                 }
2675         }
2676
2677         return error;
2678 }
2679
2680 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2681                                                 struct super_block *sb,
2682                                                 void *data, int silent)
2683 {
2684         int nBlocks;
2685         struct inode *inode = NULL;
2686         struct dentry *root;
2687         yaffs_dev_t *dev = 0;
2688         char devname_buf[BDEVNAME_SIZE + 1];
2689         struct mtd_info *mtd;
2690         int err;
2691         char *data_str = (char *)data;
2692         struct yaffs_LinuxContext *context = NULL;
2693         yaffs_param_t *param;
2694
2695         int read_only = 0;
2696
2697         yaffs_options options;
2698
2699         unsigned mount_id;
2700         int found;
2701         struct yaffs_LinuxContext *context_iterator;
2702         struct ylist_head *l;
2703
2704         sb->s_magic = YAFFS_MAGIC;
2705         sb->s_op = &yaffs_super_ops;
2706         sb->s_flags |= MS_NOATIME;
2707
2708         read_only =((sb->s_flags & MS_RDONLY) != 0);
2709
2710
2711 #ifdef YAFFS_COMPILE_EXPORTFS
2712         sb->s_export_op = &yaffs_export_ops;
2713 #endif
2714
2715         if (!sb)
2716                 printk(KERN_INFO "yaffs: sb is NULL\n");
2717         else if (!sb->s_dev)
2718                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2719         else if (!yaffs_devname(sb, devname_buf))
2720                 printk(KERN_INFO "yaffs: devname is NULL\n");
2721         else
2722                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2723                        sb->s_dev,
2724                        yaffs_devname(sb, devname_buf),
2725                        read_only ? "ro" : "rw");
2726
2727         if (!data_str)
2728                 data_str = "";
2729
2730         printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2731
2732         memset(&options, 0, sizeof(options));
2733
2734         if (yaffs_parse_options(&options, data_str)) {
2735                 /* Option parsing failed */
2736                 return NULL;
2737         }
2738
2739
2740         sb->s_blocksize = PAGE_CACHE_SIZE;
2741         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2742
2743         T(YAFFS_TRACE_OS,
2744                 (TSTR("yaffs_read_super: Using yaffs%d\n"), yaffs_version));
2745         T(YAFFS_TRACE_OS,
2746                 (TSTR("yaffs_read_super: block size %d\n"),
2747                 (int)(sb->s_blocksize)));
2748
2749         T(YAFFS_TRACE_ALWAYS,
2750                 (TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"),
2751                MAJOR(sb->s_dev), MINOR(sb->s_dev),
2752                yaffs_devname(sb, devname_buf)));
2753
2754         /* Check it's an mtd device..... */
2755         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2756                 return NULL;    /* This isn't an mtd device */
2757
2758         /* Get the device */
2759         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2760         if (!mtd) {
2761                 T(YAFFS_TRACE_ALWAYS,
2762                         (TSTR("yaffs: MTD device #%u doesn't appear to exist\n"),
2763                         MINOR(sb->s_dev)));
2764                 return NULL;
2765         }
2766         /* Check it's NAND */
2767         if (mtd->type != MTD_NANDFLASH) {
2768                 T(YAFFS_TRACE_ALWAYS,
2769                         (TSTR("yaffs: MTD device is not NAND it's type %d\n"),
2770                         mtd->type));
2771                 return NULL;
2772         }
2773
2774         T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase));
2775         T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read));
2776         T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write));
2777         T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob));
2778         T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob));
2779         T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad));
2780         T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad));
2781         T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd)));
2782         T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize));
2783         T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize));
2784 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
2785         T(YAFFS_TRACE_OS, (TSTR(" size %u\n"), mtd->size));
2786 #else
2787         T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
2788 #endif
2789
2790 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2791
2792         if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
2793                 T(YAFFS_TRACE_ALWAYS,
2794                         (TSTR("yaffs: auto selecting yaffs2\n")));
2795                 yaffs_version = 2;
2796         }
2797
2798         /* Added NCB 26/5/2006 for completeness */
2799         if (yaffs_version == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
2800                 T(YAFFS_TRACE_ALWAYS,
2801                         (TSTR("yaffs: auto selecting yaffs1\n")));
2802                 yaffs_version = 1;
2803         }
2804
2805 #endif
2806
2807         if (yaffs_version == 2) {
2808                 /* Check for version 2 style functions */
2809                 if (!mtd->erase ||
2810                     !mtd->block_isbad ||
2811                     !mtd->block_markbad ||
2812                     !mtd->read ||
2813                     !mtd->write ||
2814 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2815                     !mtd->read_oob || !mtd->write_oob) {
2816 #else
2817                     !mtd->write_ecc ||
2818                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2819 #endif
2820                         T(YAFFS_TRACE_ALWAYS,
2821                           (TSTR("yaffs: MTD device does not support required "
2822                            "functions\n")));
2823                         return NULL;
2824                 }
2825
2826                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2827                     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2828                     !options.inband_tags) {
2829                         T(YAFFS_TRACE_ALWAYS,
2830                           (TSTR("yaffs: MTD device does not have the "
2831                            "right page sizes\n")));
2832                         return NULL;
2833                 }
2834         } else {
2835                 /* Check for V1 style functions */
2836                 if (!mtd->erase ||
2837                     !mtd->read ||
2838                     !mtd->write ||
2839 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2840                     !mtd->read_oob || !mtd->write_oob) {
2841 #else
2842                     !mtd->write_ecc ||
2843                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2844 #endif
2845                         T(YAFFS_TRACE_ALWAYS,
2846                           (TSTR("yaffs: MTD device does not support required "
2847                            "functions\n")));
2848                         return NULL;
2849                 }
2850
2851                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2852                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2853                         T(YAFFS_TRACE_ALWAYS,
2854                           (TSTR("yaffs: MTD device does not support have the "
2855                            "right page sizes\n")));
2856                         return NULL;
2857                 }
2858         }
2859
2860         /* OK, so if we got here, we have an MTD that's NAND and looks
2861          * like it has the right capabilities
2862          * Set the yaffs_dev_t up for mtd
2863          */
2864
2865         if (!read_only && !(mtd->flags & MTD_WRITEABLE)){
2866                 read_only = 1;
2867                 printk(KERN_INFO "yaffs: mtd is read only, setting superblock read only");
2868                 sb->s_flags |= MS_RDONLY;
2869         }
2870
2871         dev = kmalloc(sizeof(yaffs_dev_t), GFP_KERNEL);
2872         context = kmalloc(sizeof(struct yaffs_LinuxContext),GFP_KERNEL);
2873
2874         if(!dev || !context ){
2875                 if(dev)
2876                         kfree(dev);
2877                 if(context)
2878                         kfree(context);
2879                 dev = NULL;
2880                 context = NULL;
2881         }
2882
2883         if (!dev) {
2884                 /* Deep shit could not allocate device structure */
2885                 T(YAFFS_TRACE_ALWAYS,
2886                   (TSTR("yaffs_read_super: Failed trying to allocate "
2887                    "yaffs_dev_t. \n")));
2888                 return NULL;
2889         }
2890         memset(dev, 0, sizeof(yaffs_dev_t));
2891         param = &(dev->param);
2892
2893         memset(context,0,sizeof(struct yaffs_LinuxContext));
2894         dev->os_context = context;
2895         YINIT_LIST_HEAD(&(context->contextList));
2896         context->dev = dev;
2897         context->superBlock = sb;
2898
2899         dev->read_only = read_only;
2900
2901 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2902         sb->s_fs_info = dev;
2903 #else
2904         sb->u.generic_sbp = dev;
2905 #endif
2906
2907         dev->driver_context = mtd;
2908         param->name = mtd->name;
2909
2910         /* Set up the memory size parameters.... */
2911
2912         nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2913
2914         param->start_block = 0;
2915         param->end_block = nBlocks - 1;
2916         param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2917         param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2918         param->n_reserved_blocks = 5;
2919         param->n_caches = (options.no_cache) ? 0 : 10;
2920         param->inband_tags = options.inband_tags;
2921
2922 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2923         param->disable_lazy_load = 1;
2924 #endif
2925 #ifdef CONFIG_YAFFS_XATTR
2926         param->enable_xattr = 1;
2927 #endif
2928         if(options.lazy_loading_overridden)
2929                 param->disable_lazy_load = !options.lazy_loading_enabled;
2930
2931 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2932         param->no_tags_ecc = 1;
2933 #endif
2934
2935 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2936 #else
2937         param->defered_dir_update = 1;
2938 #endif
2939
2940         if(options.tags_ecc_overridden)
2941                 param->no_tags_ecc = !options.tags_ecc_on;
2942
2943 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2944         param->empty_lost_n_found = 1;
2945 #endif
2946
2947 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2948         param->refresh_period = 0;
2949 #else
2950         param->refresh_period = 500;
2951 #endif
2952
2953 #ifdef CONFIG_YAFFS__ALWAYS_CHECK_CHUNK_ERASED
2954         param->always_check_erased = 1;
2955 #endif
2956
2957         if(options.empty_lost_and_found_overridden)
2958                 param->empty_lost_n_found = options.empty_lost_and_found;
2959
2960         /* ... and the functions. */
2961         if (yaffs_version == 2) {
2962                 param->write_chunk_tags_fn =
2963                     nandmtd2_WriteChunkWithTagsToNAND;
2964                 param->read_chunk_tags_fn =
2965                     nandmtd2_ReadChunkWithTagsFromNAND;
2966                 param->bad_block_fn = nandmtd2_MarkNANDBlockBad;
2967                 param->query_block_fn = nandmtd2_QueryNANDBlock;
2968                 yaffs_dev_to_lc(dev)->spareBuffer = YMALLOC(mtd->oobsize);
2969                 param->is_yaffs2 = 1;
2970 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2971                 param->total_bytes_per_chunk = mtd->writesize;
2972                 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2973 #else
2974                 param->total_bytes_per_chunk = mtd->oobblock;
2975                 param->chunks_per_block = mtd->erasesize / mtd->oobblock;
2976 #endif
2977                 nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2978
2979                 param->start_block = 0;
2980                 param->end_block = nBlocks - 1;
2981         } else {
2982 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2983                 /* use the MTD interface in yaffs_mtdif1.c */
2984                 param->write_chunk_tags_fn =
2985                         nandmtd1_WriteChunkWithTagsToNAND;
2986                 param->read_chunk_tags_fn =
2987                         nandmtd1_ReadChunkWithTagsFromNAND;
2988                 param->bad_block_fn = nandmtd1_MarkNANDBlockBad;
2989                 param->query_block_fn = nandmtd1_QueryNANDBlock;
2990 #else
2991                 param->write_chunk_fn = nandmtd_WriteChunkToNAND;
2992                 param->read_chunk_fn = nandmtd_ReadChunkFromNAND;
2993 #endif
2994                 param->is_yaffs2 = 0;
2995         }
2996         /* ... and common functions */
2997         param->erase_fn = nandmtd_EraseBlockInNAND;
2998         param->initialise_flash_fn = nandmtd_InitialiseNAND;
2999
3000         yaffs_dev_to_lc(dev)->putSuperFunc = yaffs_MTDPutSuper;
3001
3002         param->sb_dirty_fn = yaffs_touch_super;
3003         param->gc_control = yaffs_gc_control_callback;
3004
3005         yaffs_dev_to_lc(dev)->superBlock= sb;
3006
3007
3008 #ifndef CONFIG_YAFFS_DOES_ECC
3009         param->use_nand_ecc = 1;
3010 #endif
3011
3012 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
3013         param->wide_tnodes_disabled = 1;
3014 #endif
3015
3016         param->skip_checkpt_rd = options.skip_checkpoint_read;
3017         param->skip_checkpt_wr = options.skip_checkpoint_write;
3018
3019         down(&yaffs_context_lock);
3020         /* Get a mount id */
3021         found = 0;
3022         for(mount_id=0; ! found; mount_id++){
3023                 found = 1;
3024                 ylist_for_each(l,&yaffs_context_list){
3025                         context_iterator = ylist_entry(l,struct yaffs_LinuxContext,contextList);
3026                         if(context_iterator->mount_id == mount_id)
3027                                 found = 0;
3028                 }
3029         }
3030         context->mount_id = mount_id;
3031
3032         ylist_add_tail(&(yaffs_dev_to_lc(dev)->contextList), &yaffs_context_list);
3033         up(&yaffs_context_lock);
3034
3035         /* Directory search handling...*/
3036         YINIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->searchContexts));
3037         param->remove_obj_fn = yaffs_remove_obj_callback;
3038
3039         init_MUTEX(&(yaffs_dev_to_lc(dev)->grossLock));
3040
3041         yaffs_gross_lock(dev);
3042
3043         err = yaffs_guts_initialise(dev);
3044
3045         T(YAFFS_TRACE_OS,
3046           (TSTR("yaffs_read_super: guts initialised %s\n"),
3047            (err == YAFFS_OK) ? "OK" : "FAILED"));
3048
3049         if(err == YAFFS_OK)
3050                 yaffs_bg_start(dev);
3051
3052         if(!context->bgThread)
3053                 param->defered_dir_update = 0;
3054
3055
3056         /* Release lock before yaffs_get_inode() */
3057         yaffs_gross_unlock(dev);
3058
3059         /* Create root inode */
3060         if (err == YAFFS_OK)
3061                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
3062                                         yaffs_root(dev));
3063
3064         if (!inode)
3065                 return NULL;
3066
3067         inode->i_op = &yaffs_dir_inode_operations;
3068         inode->i_fop = &yaffs_dir_operations;
3069
3070         T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n")));
3071
3072         root = d_alloc_root(inode);
3073
3074         T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n")));
3075
3076         if (!root) {
3077                 iput(inode);
3078                 return NULL;
3079         }
3080         sb->s_root = root;
3081         sb->s_dirt = !dev->is_checkpointed;
3082         T(YAFFS_TRACE_ALWAYS,
3083                 (TSTR("yaffs_read_super: is_checkpointed %d\n"),
3084                 dev->is_checkpointed));
3085
3086         T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n")));
3087         return sb;
3088 }
3089
3090
3091 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3092 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
3093                                          int silent)
3094 {
3095         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
3096 }
3097
3098 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3099 static int yaffs_read_super(struct file_system_type *fs,
3100                             int flags, const char *dev_name,
3101                             void *data, struct vfsmount *mnt)
3102 {
3103
3104         return get_sb_bdev(fs, flags, dev_name, data,
3105                            yaffs_internal_read_super_mtd, mnt);
3106 }
3107 #else
3108 static struct super_block *yaffs_read_super(struct file_system_type *fs,
3109                                             int flags, const char *dev_name,
3110                                             void *data)
3111 {
3112
3113         return get_sb_bdev(fs, flags, dev_name, data,
3114                            yaffs_internal_read_super_mtd);
3115 }
3116 #endif
3117
3118 static struct file_system_type yaffs_fs_type = {
3119         .owner = THIS_MODULE,
3120         .name = "yaffs",
3121         .get_sb = yaffs_read_super,
3122         .kill_sb = kill_block_super,
3123         .fs_flags = FS_REQUIRES_DEV,
3124 };
3125 #else
3126 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
3127                                             int silent)
3128 {
3129         return yaffs_internal_read_super(1, sb, data, silent);
3130 }
3131
3132 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
3133                       FS_REQUIRES_DEV);
3134 #endif
3135
3136
3137 #ifdef CONFIG_YAFFS_YAFFS2
3138
3139 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3140 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
3141                                           int silent)
3142 {
3143         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
3144 }
3145
3146 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3147 static int yaffs2_read_super(struct file_system_type *fs,
3148                         int flags, const char *dev_name, void *data,
3149                         struct vfsmount *mnt)
3150 {
3151         return get_sb_bdev(fs, flags, dev_name, data,
3152                         yaffs2_internal_read_super_mtd, mnt);
3153 }
3154 #else
3155 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
3156                                              int flags, const char *dev_name,
3157                                              void *data)
3158 {
3159
3160         return get_sb_bdev(fs, flags, dev_name, data,
3161                            yaffs2_internal_read_super_mtd);
3162 }
3163 #endif
3164
3165 static struct file_system_type yaffs2_fs_type = {
3166         .owner = THIS_MODULE,
3167         .name = "yaffs2",
3168         .get_sb = yaffs2_read_super,
3169         .kill_sb = kill_block_super,
3170         .fs_flags = FS_REQUIRES_DEV,
3171 };
3172 #else
3173 static struct super_block *yaffs2_read_super(struct super_block *sb,
3174                                              void *data, int silent)
3175 {
3176         return yaffs_internal_read_super(2, sb, data, silent);
3177 }
3178
3179 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
3180                       FS_REQUIRES_DEV);
3181 #endif
3182
3183 #endif                          /* CONFIG_YAFFS_YAFFS2 */
3184
3185 static struct proc_dir_entry *my_proc_entry;
3186 static struct proc_dir_entry *debug_proc_entry;
3187
3188 static char *yaffs_dump_dev_part0(char *buf, yaffs_dev_t * dev)
3189 {
3190         buf += sprintf(buf, "start_block......... %d\n", dev->param.start_block);
3191         buf += sprintf(buf, "end_block........... %d\n", dev->param.end_block);
3192         buf += sprintf(buf, "total_bytes_per_chunk. %d\n", dev->param.total_bytes_per_chunk);
3193         buf += sprintf(buf, "use_nand_ecc......... %d\n", dev->param.use_nand_ecc);
3194         buf += sprintf(buf, "no_tags_ecc.......... %d\n", dev->param.no_tags_ecc);
3195         buf += sprintf(buf, "is_yaffs2........... %d\n", dev->param.is_yaffs2);
3196         buf += sprintf(buf, "inband_tags......... %d\n", dev->param.inband_tags);
3197         buf += sprintf(buf, "empty_lost_n_found.. %d\n", dev->param.empty_lost_n_found);
3198         buf += sprintf(buf, "disable_lazy_load.... %d\n", dev->param.disable_lazy_load);
3199         buf += sprintf(buf, "refresh_period...... %d\n", dev->param.refresh_period);
3200         buf += sprintf(buf, "n_caches..... %d\n", dev->param.n_caches);
3201         buf += sprintf(buf, "n_reserved_blocks.... %d\n", dev->param.n_reserved_blocks);
3202         buf += sprintf(buf, "always_check_erased.. %d\n", dev->param.always_check_erased);
3203
3204         buf += sprintf(buf, "\n");
3205
3206         return buf;
3207 }
3208
3209
3210 static char *yaffs_dump_dev_part1(char *buf, yaffs_dev_t * dev)
3211 {
3212         buf += sprintf(buf, "data_bytes_per_chunk. %d\n", dev->data_bytes_per_chunk);
3213         buf += sprintf(buf, "chunk_grp_bits..... %d\n", dev->chunk_grp_bits);
3214         buf += sprintf(buf, "chunk_grp_size..... %d\n", dev->chunk_grp_size);
3215         buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
3216         buf += sprintf(buf, "blocks_in_checkpt. %d\n", dev->blocks_in_checkpt);
3217         buf += sprintf(buf, "\n");
3218         buf += sprintf(buf, "n_tnodes............ %d\n", dev->n_tnodes);
3219         buf += sprintf(buf, "n_obj........... %d\n", dev->n_obj);
3220         buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
3221         buf += sprintf(buf, "\n");
3222         buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
3223         buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
3224         buf += sprintf(buf, "n_erasures..... %u\n", dev->n_erasures);
3225         buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
3226         buf += sprintf(buf, "all_gcs............. %u\n", dev->all_gcs);
3227         buf += sprintf(buf, "passive_gc_count......... %u\n", dev->passive_gc_count);
3228         buf += sprintf(buf, "oldest_dirty_gc_count..... %u\n", dev->oldest_dirty_gc_count);
3229         buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
3230         buf += sprintf(buf, "bg_gcs...... %u\n", dev->bg_gcs);
3231         buf += sprintf(buf, "n_retired_writes..... %u\n", dev->n_retired_writes);
3232         buf += sprintf(buf, "nRetireBlocks...... %u\n", dev->n_retired_blocks);
3233         buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
3234         buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
3235         buf += sprintf(buf, "n_tags_ecc_fixed....... %u\n", dev->n_tags_ecc_fixed);
3236         buf += sprintf(buf, "n_tags_ecc_unfixed..... %u\n", dev->n_tags_ecc_unfixed);
3237         buf += sprintf(buf, "cache_hits.......... %u\n", dev->cache_hits);
3238         buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
3239         buf += sprintf(buf, "n_unlinked_files..... %u\n", dev->n_unlinked_files);
3240         buf += sprintf(buf, "refresh_count....... %u\n", dev->refresh_count);
3241         buf +=
3242             sprintf(buf, "nBackgroudDeletions %u\n", dev->n_bg_deletions);
3243
3244         return buf;
3245 }
3246
3247 static int yaffs_proc_read(char *page,
3248                            char **start,
3249                            off_t offset, int count, int *eof, void *data)
3250 {
3251         struct ylist_head *item;
3252         char *buf = page;
3253         int step = offset;
3254         int n = 0;
3255
3256         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
3257          * We use 'offset' (*ppos) to indicate where we are in dev_list.
3258          * This also assumes the user has posted a read buffer large
3259          * enough to hold the complete output; but that's life in /proc.
3260          */
3261
3262         *(int *)start = 1;
3263
3264         /* Print header first */
3265         if (step == 0)
3266                 buf += sprintf(buf, "Multi-version YAFFS built:" __DATE__ " " __TIME__"\n");
3267         else if (step == 1)
3268                 buf += sprintf(buf,"\n");
3269         else {
3270                 step-=2;
3271
3272                 down(&yaffs_context_lock);
3273
3274                 /* Locate and print the Nth entry.  Order N-squared but N is small. */
3275                 ylist_for_each(item, &yaffs_context_list) {
3276                         struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
3277                         yaffs_dev_t *dev = dc->dev;
3278
3279                         if (n < (step & ~1)) {
3280                                 n+=2;
3281                                 continue;
3282                         }
3283                         if((step & 1)==0){
3284                                 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->param.name);
3285                                 buf = yaffs_dump_dev_part0(buf, dev);
3286                         } else
3287                                 buf = yaffs_dump_dev_part1(buf, dev);
3288
3289                         break;
3290                 }
3291                 up(&yaffs_context_lock);
3292         }
3293
3294         return buf - page < count ? buf - page : count;
3295 }
3296
3297 static int yaffs_stats_proc_read(char *page,
3298                                 char **start,
3299                                 off_t offset, int count, int *eof, void *data)
3300 {
3301         struct ylist_head *item;
3302         char *buf = page;
3303         int n = 0;
3304
3305         down(&yaffs_context_lock);
3306
3307         /* Locate and print the Nth entry.  Order N-squared but N is small. */
3308         ylist_for_each(item, &yaffs_context_list) {
3309                 struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
3310                 yaffs_dev_t *dev = dc->dev;
3311
3312                 int erasedChunks;
3313
3314                 erasedChunks = dev->n_erased_blocks * dev->param.chunks_per_block;
3315
3316                 buf += sprintf(buf,"%d, %d, %d, %u, %u, %u, %u\n",
3317                                 n, dev->n_free_chunks, erasedChunks,
3318                                 dev->bg_gcs, dev->oldest_dirty_gc_count,
3319                                 dev->n_obj, dev->n_tnodes);
3320         }
3321         up(&yaffs_context_lock);
3322
3323
3324         return buf - page < count ? buf - page : count;
3325 }
3326
3327 /**
3328  * Set the verbosity of the warnings and error messages.
3329  *
3330  * Note that the names can only be a..z or _ with the current code.
3331  */
3332
3333 static struct {
3334         char *mask_name;
3335         unsigned mask_bitfield;
3336 } mask_flags[] = {
3337         {"allocate", YAFFS_TRACE_ALLOCATE},
3338         {"always", YAFFS_TRACE_ALWAYS},
3339         {"background", YAFFS_TRACE_BACKGROUND},
3340         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
3341         {"buffers", YAFFS_TRACE_BUFFERS},
3342         {"bug", YAFFS_TRACE_BUG},
3343         {"checkpt", YAFFS_TRACE_CHECKPOINT},
3344         {"deletion", YAFFS_TRACE_DELETION},
3345         {"erase", YAFFS_TRACE_ERASE},
3346         {"error", YAFFS_TRACE_ERROR},
3347         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
3348         {"gc", YAFFS_TRACE_GC},
3349         {"lock", YAFFS_TRACE_LOCK},
3350         {"mtd", YAFFS_TRACE_MTD},
3351         {"nandaccess", YAFFS_TRACE_NANDACCESS},
3352         {"os", YAFFS_TRACE_OS},
3353         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
3354         {"scan", YAFFS_TRACE_SCAN},
3355         {"tracing", YAFFS_TRACE_TRACING},
3356         {"sync", YAFFS_TRACE_SYNC},
3357         {"write", YAFFS_TRACE_WRITE},
3358
3359         {"verify", YAFFS_TRACE_VERIFY},
3360         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
3361         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
3362         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
3363
3364         {"all", 0xffffffff},
3365         {"none", 0},
3366         {NULL, 0},
3367 };
3368
3369 #define MAX_MASK_NAME_LENGTH 40
3370 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
3371                                          unsigned long count, void *data)
3372 {
3373         unsigned rg = 0, mask_bitfield;
3374         char *end;
3375         char *mask_name;
3376         const char *x;
3377         char substring[MAX_MASK_NAME_LENGTH + 1];
3378         int i;
3379         int done = 0;
3380         int add, len = 0;
3381         int pos = 0;
3382
3383         rg = yaffs_trace_mask;
3384
3385         while (!done && (pos < count)) {
3386                 done = 1;
3387                 while ((pos < count) && isspace(buf[pos]))
3388                         pos++;
3389
3390                 switch (buf[pos]) {
3391                 case '+':
3392                 case '-':
3393                 case '=':
3394                         add = buf[pos];
3395                         pos++;
3396                         break;
3397
3398                 default:
3399                         add = ' ';
3400                         break;
3401                 }
3402                 mask_name = NULL;
3403
3404                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
3405
3406                 if (end > buf + pos) {
3407                         mask_name = "numeral";
3408                         len = end - (buf + pos);
3409                         pos += len;
3410                         done = 0;
3411                 } else {
3412                         for (x = buf + pos, i = 0;
3413                             (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
3414                             i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
3415                                 substring[i] = *x;
3416                         substring[i] = '\0';
3417
3418                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3419                                 if (strcmp(substring, mask_flags[i].mask_name) == 0) {
3420                                         mask_name = mask_flags[i].mask_name;
3421                                         mask_bitfield = mask_flags[i].mask_bitfield;
3422                                         done = 0;
3423                                         break;
3424                                 }
3425                         }
3426                 }
3427
3428                 if (mask_name != NULL) {
3429                         done = 0;
3430                         switch (add) {
3431                         case '-':
3432                                 rg &= ~mask_bitfield;
3433                                 break;
3434                         case '+':
3435                                 rg |= mask_bitfield;
3436                                 break;
3437                         case '=':
3438                                 rg = mask_bitfield;
3439                                 break;
3440                         default:
3441                                 rg |= mask_bitfield;
3442                                 break;
3443                         }
3444                 }
3445         }
3446
3447         yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
3448
3449         printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
3450
3451         if (rg & YAFFS_TRACE_ALWAYS) {
3452                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3453                         char flag;
3454                         flag = ((rg & mask_flags[i].mask_bitfield) ==
3455                                 mask_flags[i].mask_bitfield) ? '+' : '-';
3456                         printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
3457                 }
3458         }
3459
3460         return count;
3461 }
3462
3463
3464 static int yaffs_proc_write(struct file *file, const char *buf,
3465                                          unsigned long count, void *data)
3466 {
3467         return yaffs_proc_write_trace_options(file, buf, count, data);
3468 }
3469
3470 /* Stuff to handle installation of file systems */
3471 struct file_system_to_install {
3472         struct file_system_type *fst;
3473         int installed;
3474 };
3475
3476 static struct file_system_to_install fs_to_install[] = {
3477         {&yaffs_fs_type, 0},
3478         {&yaffs2_fs_type, 0},
3479         {NULL, 0}
3480 };
3481
3482 static int __init init_yaffs_fs(void)
3483 {
3484         int error = 0;
3485         struct file_system_to_install *fsinst;
3486
3487         T(YAFFS_TRACE_ALWAYS,
3488           (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n")));
3489
3490 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
3491         T(YAFFS_TRACE_ALWAYS,
3492           (TSTR(" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n")));
3493 #endif
3494
3495
3496
3497
3498         init_MUTEX(&yaffs_context_lock);
3499
3500         /* Install the proc_fs entries */
3501         my_proc_entry = create_proc_entry("yaffs",
3502                                                S_IRUGO | S_IFREG,
3503                                                YPROC_ROOT);
3504
3505         if (my_proc_entry) {
3506                 my_proc_entry->write_proc = yaffs_proc_write;
3507                 my_proc_entry->read_proc = yaffs_proc_read;
3508                 my_proc_entry->data = NULL;
3509         } else
3510                 return -ENOMEM;
3511
3512         debug_proc_entry = create_proc_entry("yaffs_stats",
3513                                                S_IRUGO | S_IFREG,
3514                                                YPROC_ROOT);
3515
3516         if (debug_proc_entry) {
3517                 debug_proc_entry->write_proc = NULL;
3518                 debug_proc_entry->read_proc = yaffs_stats_proc_read;
3519                 debug_proc_entry->data = NULL;
3520         } else
3521                 return -ENOMEM;
3522
3523         /* Now add the file system entries */
3524
3525         fsinst = fs_to_install;
3526
3527         while (fsinst->fst && !error) {
3528                 error = register_filesystem(fsinst->fst);
3529                 if (!error)
3530                         fsinst->installed = 1;
3531                 fsinst++;
3532         }
3533
3534         /* Any errors? uninstall  */
3535         if (error) {
3536                 fsinst = fs_to_install;
3537
3538                 while (fsinst->fst) {
3539                         if (fsinst->installed) {
3540                                 unregister_filesystem(fsinst->fst);
3541                                 fsinst->installed = 0;
3542                         }
3543                         fsinst++;
3544                 }
3545         }
3546
3547         return error;
3548 }
3549
3550 static void __exit exit_yaffs_fs(void)
3551 {
3552
3553         struct file_system_to_install *fsinst;
3554
3555         T(YAFFS_TRACE_ALWAYS,
3556                 (TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n")));
3557
3558         remove_proc_entry("yaffs", YPROC_ROOT);
3559         remove_proc_entry("yaffs_stats", YPROC_ROOT);
3560
3561         fsinst = fs_to_install;
3562
3563         while (fsinst->fst) {
3564                 if (fsinst->installed) {
3565                         unregister_filesystem(fsinst->fst);
3566                         fsinst->installed = 0;
3567                 }
3568                 fsinst++;
3569         }
3570 }
3571
3572 module_init(init_yaffs_fs)
3573 module_exit(exit_yaffs_fs)
3574
3575 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3576 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
3577 MODULE_LICENSE("GPL");