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 struct yaffs_dev associated with
  28  *         this superblock
  29  * >> 2.6: sb->s_fs_info  points to the struct yaffs_dev associated with this
  30  *         superblock
  31  * >> inode->u.generic_ip points to the associated struct yaffs_obj.
  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 #include "yaffs_attribs.h"
 167
 168 #include "yaffs_linux.h"
 169
 170 #include "yaffs_mtdif.h"
 171 #include "yaffs_mtdif1.h"
 172 #include "yaffs_mtdif2.h"
 173
 174 unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
 175 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
 176 unsigned int yaffs_auto_checkpoint = 1;
 177 unsigned int yaffs_gc_control = 1;
 178 unsigned int yaffs_bg_enable = 1;
 179
 180 /* Module Parameters */
 181 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 182 module_param(yaffs_trace_mask, uint, 0644);
 183 module_param(yaffs_wr_attempts, uint, 0644);
 184 module_param(yaffs_auto_checkpoint, uint, 0644);
 185 module_param(yaffs_gc_control, uint, 0644);
 186 module_param(yaffs_bg_enable, uint, 0644);
 187 #else
 188 MODULE_PARM(yaffs_trace_mask, "i");
 189 MODULE_PARM(yaffs_wr_attempts, "i");
 190 MODULE_PARM(yaffs_auto_checkpoint, "i");
 191 MODULE_PARM(yaffs_gc_control, "i");
 192 #endif
 193
 194 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
 195 /* use iget and read_inode */
 196 #define Y_IGET(sb, inum) iget((sb), (inum))
 197 static void yaffs_read_inode(struct inode *inode);
 198
 199 #else
 200 /* Call local equivalent */
 201 #define YAFFS_USE_OWN_IGET
 202 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
 203
 204 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
 205 #endif
 206
 207 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
 208 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
 209 #else
 210 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip)
 211 #endif
 212
 213 #define yaffs_inode_to_obj(iptr) ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
 214 #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
 215
 216 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 217 #define yaffs_super_to_dev(sb)  ((struct yaffs_dev *)sb->s_fs_info)
 218 #else
 219 #define yaffs_super_to_dev(sb)  ((struct yaffs_dev *)sb->u.generic_sbp)
 220 #endif
 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 static int yaffs_setxattr(struct dentry *dentry, const char *name,
 311                    const void *value, size_t size, int flags);
 312 static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
 313                        size_t size);
 314 static int yaffs_removexattr(struct dentry *dentry, const char *name);
 315 static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
 316 #endif
 317
 318 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
 319 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 320                              loff_t pos, unsigned len, unsigned flags,
 321                              struct page **pagep, void **fsdata);
 322 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 323                            loff_t pos, unsigned len, unsigned copied,
 324                            struct page *pg, void *fsdadata);
 325 #else
 326 static int yaffs_prepare_write(struct file *f, struct page *pg,
 327                                unsigned offset, unsigned to);
 328 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 329                               unsigned to);
 330
 331 #endif
 332
 333 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 334                           int buflen);
 335 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 336 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
 337 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 338 #else
 339 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 340 #endif
 341
 342 static void yaffs_touch_super(struct yaffs_dev *dev);
 343
 344 static int yaffs_vfs_setattr(struct inode *, struct iattr *);
 345
 346 static struct address_space_operations yaffs_file_address_operations = {
 347         .readpage = yaffs_readpage,
 348         .writepage = yaffs_writepage,
 349 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 350         .write_begin = yaffs_write_begin,
 351         .write_end = yaffs_write_end,
 352 #else
 353         .prepare_write = yaffs_prepare_write,
 354         .commit_write = yaffs_commit_write,
 355 #endif
 356 };
 357
 358 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
 359 static const struct file_operations yaffs_file_operations = {
 360         .read = do_sync_read,
 361         .write = do_sync_write,
 362         .aio_read = generic_file_aio_read,
 363         .aio_write = generic_file_aio_write,
 364         .mmap = generic_file_mmap,
 365         .flush = yaffs_file_flush,
 366         .fsync = yaffs_sync_object,
 367         .splice_read = generic_file_splice_read,
 368         .splice_write = generic_file_splice_write,
 369         .llseek = generic_file_llseek,
 370 };
 371
 372 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
 373
 374 static const struct file_operations yaffs_file_operations = {
 375         .read = do_sync_read,
 376         .write = do_sync_write,
 377         .aio_read = generic_file_aio_read,
 378         .aio_write = generic_file_aio_write,
 379         .mmap = generic_file_mmap,
 380         .flush = yaffs_file_flush,
 381         .fsync = yaffs_sync_object,
 382         .sendfile = generic_file_sendfile,
 383 };
 384
 385 #else
 386
 387 static const struct file_operations yaffs_file_operations = {
 388         .read = generic_file_read,
 389         .write = generic_file_write,
 390         .mmap = generic_file_mmap,
 391         .flush = yaffs_file_flush,
 392         .fsync = yaffs_sync_object,
 393 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 394         .sendfile = generic_file_sendfile,
 395 #endif
 396 };
 397 #endif
 398
 399 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
 400 static void zero_user_segment(struct page *page, unsigned start, unsigned end)
 401 {
 402         void *kaddr = kmap_atomic(page, KM_USER0);
 403         memset(kaddr + start, 0, end - start);
 404         kunmap_atomic(kaddr, KM_USER0);
 405         flush_dcache_page(page);
 406 }
 407 #endif
 408
 409 static const struct inode_operations yaffs_file_inode_operations = {
 410         .setattr = yaffs_setattr,
 411 #ifdef CONFIG_YAFFS_XATTR
 412         .setxattr = yaffs_setxattr,
 413         .getxattr = yaffs_getxattr,
 414         .listxattr = yaffs_listxattr,
 415         .removexattr = yaffs_removexattr,
 416 #endif
 417 };
 418
 419 static const struct inode_operations yaffs_symlink_inode_operations = {
 420         .readlink = yaffs_readlink,
 421         .follow_link = yaffs_follow_link,
 422 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 423         .put_link = yaffs_put_link,
 424 #endif
 425         .setattr = yaffs_setattr,
 426 #ifdef CONFIG_YAFFS_XATTR
 427         .setxattr = yaffs_setxattr,
 428         .getxattr = yaffs_getxattr,
 429         .listxattr = yaffs_listxattr,
 430         .removexattr = yaffs_removexattr,
 431 #endif
 432 };
 433
 434 static const struct inode_operations yaffs_dir_inode_operations = {
 435         .create = yaffs_create,
 436         .lookup = yaffs_lookup,
 437         .link = yaffs_link,
 438         .unlink = yaffs_unlink,
 439         .symlink = yaffs_symlink,
 440         .mkdir = yaffs_mkdir,
 441         .rmdir = yaffs_unlink,
 442         .mknod = yaffs_mknod,
 443         .rename = yaffs_rename,
 444         .setattr = yaffs_setattr,
 445 #ifdef CONFIG_YAFFS_XATTR
 446         .setxattr = yaffs_setxattr,
 447         .getxattr = yaffs_getxattr,
 448         .listxattr = yaffs_listxattr,
 449         .removexattr = yaffs_removexattr,
 450 #endif
 451 };
 452
 453 static const struct file_operations yaffs_dir_operations = {
 454         .read = generic_read_dir,
 455         .readdir = yaffs_readdir,
 456         .fsync = yaffs_sync_object,
 457         .llseek = generic_file_llseek,
 458 };
 459
 460 static const struct super_operations yaffs_super_ops = {
 461         .statfs = yaffs_statfs,
 462
 463 #ifndef YAFFS_USE_OWN_IGET
 464         .read_inode = yaffs_read_inode,
 465 #endif
 466 #ifdef YAFFS_HAS_PUT_INODE
 467         .put_inode = yaffs_put_inode,
 468 #endif
 469         .put_super = yaffs_put_super,
 470 #ifdef YAFFS_HAS_EVICT_INODE
 471         .evict_inode = yaffs_evict_inode,
 472 #else
 473         .delete_inode = yaffs_delete_inode,
 474         .clear_inode = yaffs_clear_inode,
 475 #endif
 476         .sync_fs = yaffs_sync_fs,
 477         .write_super = yaffs_write_super,
 478 };
 479
 480 static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
 481 {
 482 #ifdef  YAFFS_USE_SETATTR_COPY
 483         setattr_copy(inode, attr);
 484         return 0;
 485 #else
 486         return inode_setattr(inode, attr);
 487 #endif
 488
 489 }
 490
 491 static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
 492 {
 493 #ifdef  YAFFS_USE_TRUNCATE_SETSIZE
 494         truncate_setsize(inode, newsize);
 495         return 0;
 496 #else
 497         truncate_inode_pages(&inode->i_data, newsize);
 498         return 0;
 499 #endif
 500
 501 }
 502
 503 static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
 504 {
 505         return yaffs_gc_control;
 506 }
 507
 508 static void yaffs_gross_lock(struct yaffs_dev *dev)
 509 {
 510         yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
 511         mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
 512         yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
 513 }
 514
 515 static void yaffs_gross_unlock(struct yaffs_dev *dev)
 516 {
 517         yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
 518         mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
 519 }
 520
 521 #ifdef YAFFS_COMPILE_EXPORTFS
 522
 523 static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
 524                                           uint32_t generation)
 525 {
 526         return Y_IGET(sb, ino);
 527 }
 528
 529 static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
 530                                           struct fid *fid, int fh_len,
 531                                           int fh_type)
 532 {
 533         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 534                                     yaffs2_nfs_get_inode);
 535 }
 536
 537 static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
 538                                           struct fid *fid, int fh_len,
 539                                           int fh_type)
 540 {
 541         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 542                                     yaffs2_nfs_get_inode);
 543 }
 544
 545 struct dentry *yaffs2_get_parent(struct dentry *dentry)
 546 {
 547
 548         struct super_block *sb = dentry->d_inode->i_sb;
 549         struct dentry *parent = ERR_PTR(-ENOENT);
 550         struct inode *inode;
 551         unsigned long parent_ino;
 552         struct yaffs_obj *d_obj;
 553         struct yaffs_obj *parent_obj;
 554
 555         d_obj = yaffs_inode_to_obj(dentry->d_inode);
 556
 557         if (d_obj) {
 558                 parent_obj = d_obj->parent;
 559                 if (parent_obj) {
 560                         parent_ino = yaffs_get_obj_inode(parent_obj);
 561                         inode = Y_IGET(sb, parent_ino);
 562
 563                         if (IS_ERR(inode)) {
 564                                 parent = ERR_CAST(inode);
 565                         } else {
 566                                 parent = d_obtain_alias(inode);
 567                                 if (!IS_ERR(parent)) {
 568                                         parent = ERR_PTR(-ENOMEM);
 569                                         iput(inode);
 570                                 }
 571                         }
 572                 }
 573         }
 574
 575         return parent;
 576 }
 577
 578 /* Just declare a zero structure as a NULL value implies
 579  * using the default functions of exportfs.
 580  */
 581
 582 static struct export_operations yaffs_export_ops = {
 583         .fh_to_dentry = yaffs2_fh_to_dentry,
 584         .fh_to_parent = yaffs2_fh_to_parent,
 585         .get_parent = yaffs2_get_parent,
 586 };
 587
 588 #endif
 589
 590 /*-----------------------------------------------------------------*/
 591 /* Directory search context allows us to unlock access to yaffs during
 592  * filldir without causing problems with the directory being modified.
 593  * This is similar to the tried and tested mechanism used in yaffs direct.
 594  *
 595  * A search context iterates along a doubly linked list of siblings in the
 596  * directory. If the iterating object is deleted then this would corrupt
 597  * the list iteration, likely causing a crash. The search context avoids
 598  * this by using the remove_obj_fn to move the search context to the
 599  * next object before the object is deleted.
 600  *
 601  * Many readdirs (and thus seach conexts) may be alive simulateously so
 602  * each struct yaffs_dev has a list of these.
 603  *
 604  * A seach context lives for the duration of a readdir.
 605  *
 606  * All these functions must be called while yaffs is locked.
 607  */
 608
 609 struct yaffs_search_context {
 610         struct yaffs_dev *dev;
 611         struct yaffs_obj *dir_obj;
 612         struct yaffs_obj *next_return;
 613         struct list_head others;
 614 };
 615
 616 /*
 617  * yaffs_new_search() creates a new search context, initialises it and
 618  * adds it to the device's search context list.
 619  *
 620  * Called at start of readdir.
 621  */
 622 static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
 623 {
 624         struct yaffs_dev *dev = dir->my_dev;
 625         struct yaffs_search_context *sc =
 626             kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
 627         if (sc) {
 628                 sc->dir_obj = dir;
 629                 sc->dev = dev;
 630                 if (list_empty(&sc->dir_obj->variant.dir_variant.children))
 631                         sc->next_return = NULL;
 632                 else
 633                         sc->next_return =
 634                             list_entry(dir->variant.dir_variant.children.next,
 635                                        struct yaffs_obj, siblings);
 636                 INIT_LIST_HEAD(&sc->others);
 637                 list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
 638         }
 639         return sc;
 640 }
 641
 642 /*
 643  * yaffs_search_end() disposes of a search context and cleans up.
 644  */
 645 static void yaffs_search_end(struct yaffs_search_context *sc)
 646 {
 647         if (sc) {
 648                 list_del(&sc->others);
 649                 kfree(sc);
 650         }
 651 }
 652
 653 /*
 654  * yaffs_search_advance() moves a search context to the next object.
 655  * Called when the search iterates or when an object removal causes
 656  * the search context to be moved to the next object.
 657  */
 658 static void yaffs_search_advance(struct yaffs_search_context *sc)
 659 {
 660         if (!sc)
 661                 return;
 662
 663         if (sc->next_return == NULL ||
 664             list_empty(&sc->dir_obj->variant.dir_variant.children))
 665                 sc->next_return = NULL;
 666         else {
 667                 struct list_head *next = sc->next_return->siblings.next;
 668
 669                 if (next == &sc->dir_obj->variant.dir_variant.children)
 670                         sc->next_return = NULL; /* end of list */
 671                 else
 672                         sc->next_return =
 673                             list_entry(next, struct yaffs_obj, siblings);
 674         }
 675 }
 676
 677 /*
 678  * yaffs_remove_obj_callback() is called when an object is unlinked.
 679  * We check open search contexts and advance any which are currently
 680  * on the object being iterated.
 681  */
 682 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
 683 {
 684
 685         struct list_head *i;
 686         struct yaffs_search_context *sc;
 687         struct list_head *search_contexts =
 688             &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
 689
 690         /* Iterate through the directory search contexts.
 691          * If any are currently on the object being removed, then advance
 692          * the search context to the next object to prevent a hanging pointer.
 693          */
 694         list_for_each(i, search_contexts) {
 695                 if (i) {
 696                         sc = list_entry(i, struct yaffs_search_context, others);
 697                         if (sc->next_return == obj)
 698                                 yaffs_search_advance(sc);
 699                 }
 700         }
 701
 702 }
 703
 704 /*-----------------------------------------------------------------*/
 705
 706 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 707                           int buflen)
 708 {
 709         unsigned char *alias;
 710         int ret;
 711
 712         struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
 713
 714         yaffs_gross_lock(dev);
 715
 716         alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
 717
 718         yaffs_gross_unlock(dev);
 719
 720         if (!alias)
 721                 return -ENOMEM;
 722
 723         ret = vfs_readlink(dentry, buffer, buflen, alias);
 724         kfree(alias);
 725         return ret;
 726 }
 727
 728 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 729 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 730 {
 731         void *ret;
 732 #else
 733 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 734 {
 735         int ret
 736 #endif
 737         unsigned char *alias;
 738         int ret_int = 0;
 739         struct yaffs_dev *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_int = -ENOMEM;
 748                 goto out;
 749         }
 750 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 751         nd_set_link(nd, alias);
 752         ret = alias;
 753 out:
 754         if (ret_int)
 755                 ret = ERR_PTR(ret_int);
 756         return ret;
 757 #else
 758         ret = vfs_follow_link(nd, alias);
 759         kfree(alias);
 760 out:
 761         if (ret_int)
 762                 ret = ret_int;
 763         return ret;
 764 #endif
 765 }
 766
 767 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 768 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
 769 {
 770         kfree(alias);
 771 }
 772 #endif
 773
 774 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 775                               struct yaffs_obj *obj);
 776
 777 /*
 778  * Lookup is used to find objects in the fs
 779  */
 780 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 781
 782 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 783                                    struct nameidata *n)
 784 #else
 785 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 786 #endif
 787 {
 788         struct yaffs_obj *obj;
 789         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 790
 791         struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
 792
 793         if (current != yaffs_dev_to_lc(dev)->readdir_process)
 794                 yaffs_gross_lock(dev);
 795
 796         yaffs_trace(YAFFS_TRACE_OS,"yaffs_lookup for %d:%s",
 797                 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
 798
 799         obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
 800
 801         obj = yaffs_get_equivalent_obj(obj);    /* in case it was a hardlink */
 802
 803         /* Can't hold gross lock when calling yaffs_get_inode() */
 804         if (current != yaffs_dev_to_lc(dev)->readdir_process)
 805                 yaffs_gross_unlock(dev);
 806
 807         if (obj) {
 808                 yaffs_trace(YAFFS_TRACE_OS,
 809                         "yaffs_lookup found %d", obj->obj_id);
 810
 811                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 812         } else {
 813                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
 814
 815         }
 816
 817 /* added NCB for 2.5/6 compatability - forces add even if inode is
 818  * NULL which creates dentry hash */
 819         d_add(dentry, inode);
 820
 821         return NULL;
 822 }
 823
 824 #ifdef YAFFS_HAS_PUT_INODE
 825
 826 /* For now put inode is just for debugging
 827  * Put inode is called when the inode **structure** is put.
 828  */
 829 static void yaffs_put_inode(struct inode *inode)
 830 {
 831         yaffs_trace(YAFFS_TRACE_OS,
 832                 "yaffs_put_inode: ino %d, count %d"),
 833                 (int)inode->i_ino, atomic_read(&inode->i_count);
 834
 835 }
 836 #endif
 837
 838 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
 839 {
 840         /* Clear the association between the inode and
 841          * the struct yaffs_obj.
 842          */
 843         obj->my_inode = NULL;
 844         yaffs_inode_to_obj_lv(inode) = NULL;
 845
 846         /* If the object freeing was deferred, then the real
 847          * free happens now.
 848          * This should fix the inode inconsistency problem.
 849          */
 850         yaffs_handle_defered_free(obj);
 851 }
 852
 853 #ifdef YAFFS_HAS_EVICT_INODE
 854 /* yaffs_evict_inode combines into one operation what was previously done in
 855  * yaffs_clear_inode() and yaffs_delete_inode()
 856  *
 857  */
 858 static void yaffs_evict_inode(struct inode *inode)
 859 {
 860         struct yaffs_obj *obj;
 861         struct yaffs_dev *dev;
 862         int deleteme = 0;
 863
 864         obj = yaffs_inode_to_obj(inode);
 865
 866         yaffs_trace(YAFFS_TRACE_OS,
 867                 "yaffs_evict_inode: ino %d, count %d %s",
 868                 (int)inode->i_ino, atomic_read(&inode->i_count),
 869                 obj ? "object exists" : "null object"));
 870
 871         if (!inode->i_nlink && !is_bad_inode(inode))
 872                 deleteme = 1;
 873         truncate_inode_pages(&inode->i_data, 0);
 874         end_writeback(inode);
 875
 876         if (deleteme && obj) {
 877                 dev = obj->my_dev;
 878                 yaffs_gross_lock(dev);
 879                 yaffs_del_obj(obj);
 880                 yaffs_gross_unlock(dev);
 881         }
 882         if (obj) {
 883                 dev = obj->my_dev;
 884                 yaffs_gross_lock(dev);
 885                 yaffs_unstitch_obj(inode, obj);
 886                 yaffs_gross_unlock(dev);
 887         }
 888 }
 889 #else
 890
 891 /* clear is called to tell the fs to release any per-inode data it holds.
 892  * The object might still exist on disk and is just being thrown out of the cache
 893  * or else the object has actually been deleted and we're being called via
 894  * the chain
 895  *   yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
 896  */
 897
 898 static void yaffs_clear_inode(struct inode *inode)
 899 {
 900         struct yaffs_obj *obj;
 901         struct yaffs_dev *dev;
 902
 903         obj = yaffs_inode_to_obj(inode);
 904
 905         yaffs_trace(YAFFS_TRACE_OS,
 906                 "yaffs_clear_inode: ino %d, count %d %s",
 907                 (int)inode->i_ino, atomic_read(&inode->i_count),
 908                 obj ? "object exists" : "null object");
 909
 910         if (obj) {
 911                 dev = obj->my_dev;
 912                 yaffs_gross_lock(dev);
 913                 yaffs_unstitch_obj(inode, obj);
 914                 yaffs_gross_unlock(dev);
 915         }
 916
 917 }
 918
 919 /* delete is called when the link count is zero and the inode
 920  * is put (ie. nobody wants to know about it anymore, time to
 921  * delete the file).
 922  * NB Must call clear_inode()
 923  */
 924 static void yaffs_delete_inode(struct inode *inode)
 925 {
 926         struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
 927         struct yaffs_dev *dev;
 928
 929         yaffs_trace(YAFFS_TRACE_OS,
 930                 "yaffs_delete_inode: ino %d, count %d %s",
 931                 (int)inode->i_ino, atomic_read(&inode->i_count),
 932                 obj ? "object exists" : "null object");
 933
 934         if (obj) {
 935                 dev = obj->my_dev;
 936                 yaffs_gross_lock(dev);
 937                 yaffs_del_obj(obj);
 938                 yaffs_gross_unlock(dev);
 939         }
 940 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 941         truncate_inode_pages(&inode->i_data, 0);
 942 #endif
 943         clear_inode(inode);
 944 }
 945 #endif
 946
 947 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 948 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 949 #else
 950 static int yaffs_file_flush(struct file *file)
 951 #endif
 952 {
 953         struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
 954
 955         struct yaffs_dev *dev = obj->my_dev;
 956
 957         yaffs_trace(YAFFS_TRACE_OS,
 958                 "yaffs_file_flush object %d (%s)",
 959                 obj->obj_id,
 960                 obj->dirty ? "dirty" : "clean");
 961
 962         yaffs_gross_lock(dev);
 963
 964         yaffs_flush_file(obj, 1, 0);
 965
 966         yaffs_gross_unlock(dev);
 967
 968         return 0;
 969 }
 970
 971 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 972 {
 973         /* Lifted from jffs2 */
 974
 975         struct yaffs_obj *obj;
 976         unsigned char *pg_buf;
 977         int ret;
 978
 979         struct yaffs_dev *dev;
 980
 981         yaffs_trace(YAFFS_TRACE_OS,
 982                 "yaffs_readpage_nolock at %08x, size %08x",
 983                 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 984                 (unsigned)PAGE_CACHE_SIZE);
 985
 986         obj = yaffs_dentry_to_obj(f->f_dentry);
 987
 988         dev = obj->my_dev;
 989
 990 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 991         BUG_ON(!PageLocked(pg));
 992 #else
 993         if (!PageLocked(pg))
 994                 PAGE_BUG(pg);
 995 #endif
 996
 997         pg_buf = kmap(pg);
 998         /* FIXME: Can kmap fail? */
 999
1000         yaffs_gross_lock(dev);
1001
1002         ret = yaffs_file_rd(obj, pg_buf,
1003                             pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
1004
1005         yaffs_gross_unlock(dev);
1006
1007         if (ret >= 0)
1008                 ret = 0;
1009
1010         if (ret) {
1011                 ClearPageUptodate(pg);
1012                 SetPageError(pg);
1013         } else {
1014                 SetPageUptodate(pg);
1015                 ClearPageError(pg);
1016         }
1017
1018         flush_dcache_page(pg);
1019         kunmap(pg);
1020
1021         yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
1022         return ret;
1023 }
1024
1025 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
1026 {
1027         int ret = yaffs_readpage_nolock(f, pg);
1028         UnlockPage(pg);
1029         return ret;
1030 }
1031
1032 static int yaffs_readpage(struct file *f, struct page *pg)
1033 {
1034         int ret;
1035
1036         yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
1037         ret = yaffs_readpage_unlock(f, pg);
1038         yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
1039         return ret;
1040 }
1041
1042 /* writepage inspired by/stolen from smbfs */
1043
1044 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1045 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
1046 #else
1047 static int yaffs_writepage(struct page *page)
1048 #endif
1049 {
1050         struct yaffs_dev *dev;
1051         struct address_space *mapping = page->mapping;
1052         struct inode *inode;
1053         unsigned long end_index;
1054         char *buffer;
1055         struct yaffs_obj *obj;
1056         int n_written = 0;
1057         unsigned n_bytes;
1058         loff_t i_size;
1059
1060         if (!mapping)
1061                 BUG();
1062         inode = mapping->host;
1063         if (!inode)
1064                 BUG();
1065         i_size = i_size_read(inode);
1066
1067         end_index = i_size >> PAGE_CACHE_SHIFT;
1068
1069         if (page->index < end_index)
1070                 n_bytes = PAGE_CACHE_SIZE;
1071         else {
1072                 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
1073
1074                 if (page->index > end_index || !n_bytes) {
1075                         yaffs_trace(YAFFS_TRACE_OS,
1076                                 "yaffs_writepage at %08x, inode size = %08x!!",
1077                                 (unsigned)(page->index << PAGE_CACHE_SHIFT),
1078                                 (unsigned)inode->i_size);
1079                         yaffs_trace(YAFFS_TRACE_OS,
1080                                 "                -> don't care!!");
1081
1082                         zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1083                         set_page_writeback(page);
1084                         unlock_page(page);
1085                         end_page_writeback(page);
1086                         return 0;
1087                 }
1088         }
1089
1090         if (n_bytes != PAGE_CACHE_SIZE)
1091                 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
1092
1093         get_page(page);
1094
1095         buffer = kmap(page);
1096
1097         obj = yaffs_inode_to_obj(inode);
1098         dev = obj->my_dev;
1099         yaffs_gross_lock(dev);
1100
1101         yaffs_trace(YAFFS_TRACE_OS,
1102                 "yaffs_writepage at %08x, size %08x",
1103                 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes);
1104         yaffs_trace(YAFFS_TRACE_OS,
1105                 "writepag0: obj = %05x, ino = %05x",
1106                 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1107
1108         n_written = yaffs_wr_file(obj, buffer,
1109                                   page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
1110
1111         yaffs_touch_super(dev);
1112
1113         yaffs_trace(YAFFS_TRACE_OS,
1114                 "writepag1: obj = %05x, ino = %05x",
1115                 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1116
1117         yaffs_gross_unlock(dev);
1118
1119         kunmap(page);
1120         set_page_writeback(page);
1121         unlock_page(page);
1122         end_page_writeback(page);
1123         put_page(page);
1124
1125         return (n_written == n_bytes) ? 0 : -ENOSPC;
1126 }
1127
1128 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1129 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
1130                              loff_t pos, unsigned len, unsigned flags,
1131                              struct page **pagep, void **fsdata)
1132 {
1133         struct page *pg = NULL;
1134         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1135
1136         int ret = 0;
1137         int space_held = 0;
1138
1139         /* Get a page */
1140 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
1141         pg = grab_cache_page_write_begin(mapping, index, flags);
1142 #else
1143         pg = __grab_cache_page(mapping, index);
1144 #endif
1145
1146         *pagep = pg;
1147         if (!pg) {
1148                 ret = -ENOMEM;
1149                 goto out;
1150         }
1151         yaffs_trace(YAFFS_TRACE_OS,
1152                 "start yaffs_write_begin index %d(%x) uptodate %d",
1153                 (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0);
1154
1155         /* Get fs space */
1156         space_held = yaffs_hold_space(filp);
1157
1158         if (!space_held) {
1159                 ret = -ENOSPC;
1160                 goto out;
1161         }
1162
1163         /* Update page if required */
1164
1165         if (!Page_Uptodate(pg))
1166                 ret = yaffs_readpage_nolock(filp, pg);
1167
1168         if (ret)
1169                 goto out;
1170
1171         /* Happy path return */
1172         yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
1173
1174         return 0;
1175
1176 out:
1177         yaffs_trace(YAFFS_TRACE_OS,
1178                 "end yaffs_write_begin fail returning %d", ret);
1179         if (space_held)
1180                 yaffs_release_space(filp);
1181         if (pg) {
1182                 unlock_page(pg);
1183                 page_cache_release(pg);
1184         }
1185         return ret;
1186 }
1187
1188 #else
1189
1190 static int yaffs_prepare_write(struct file *f, struct page *pg,
1191                                unsigned offset, unsigned to)
1192 {
1193         yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write");
1194
1195         if (!Page_Uptodate(pg))
1196                 return yaffs_readpage_nolock(f, pg);
1197         return 0;
1198 }
1199 #endif
1200
1201 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1202 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1203                            loff_t pos, unsigned len, unsigned copied,
1204                            struct page *pg, void *fsdadata)
1205 {
1206         int ret = 0;
1207         void *addr, *kva;
1208         uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1209
1210         kva = kmap(pg);
1211         addr = kva + offset_into_page;
1212
1213         yaffs_trace(YAFFS_TRACE_OS,
1214                 "yaffs_write_end addr %p pos %x n_bytes %d",
1215                 addr, (unsigned)pos, copied);
1216
1217         ret = yaffs_file_write(filp, addr, copied, &pos);
1218
1219         if (ret != copied) {
1220                 yaffs_trace(YAFFS_TRACE_OS,
1221                         "yaffs_write_end not same size ret %d  copied %d",
1222                         ret, copied);
1223                 SetPageError(pg);
1224         }
1225
1226         kunmap(pg);
1227
1228         yaffs_release_space(filp);
1229         unlock_page(pg);
1230         page_cache_release(pg);
1231         return ret;
1232 }
1233 #else
1234
1235 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
1236                               unsigned to)
1237 {
1238         void *addr, *kva;
1239
1240         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
1241         int n_bytes = to - offset;
1242         int n_written;
1243
1244         unsigned spos = pos;
1245         unsigned saddr;
1246
1247         kva = kmap(pg);
1248         addr = kva + offset;
1249
1250         saddr = (unsigned)addr;
1251
1252         yaffs_trace(YAFFS_TRACE_OS,
1253                 "yaffs_commit_write addr %x pos %x n_bytes %d",
1254                 saddr, spos, n_bytes);
1255
1256         n_written = yaffs_file_write(f, addr, n_bytes, &pos);
1257
1258         if (n_written != n_bytes) {
1259                 yaffs_trace(YAFFS_TRACE_OS,
1260                         "yaffs_commit_write not same size n_written %d  n_bytes %d",
1261                         n_written, n_bytes);
1262                 SetPageError(pg);
1263         }
1264         kunmap(pg);
1265
1266         yaffs_trace(YAFFS_TRACE_OS,
1267                 "yaffs_commit_write returning %d",
1268                 n_written == n_bytes ? 0 : n_written);
1269
1270         return n_written == n_bytes ? 0 : n_written;
1271 }
1272 #endif
1273
1274 static void yaffs_fill_inode_from_obj(struct inode *inode,
1275                                       struct yaffs_obj *obj)
1276 {
1277         if (inode && obj) {
1278
1279                 /* Check mode against the variant type and attempt to repair if broken. */
1280                 u32 mode = obj->yst_mode;
1281                 switch (obj->variant_type) {
1282                 case YAFFS_OBJECT_TYPE_FILE:
1283                         if (!S_ISREG(mode)) {
1284                                 obj->yst_mode &= ~S_IFMT;
1285                                 obj->yst_mode |= S_IFREG;
1286                         }
1287
1288                         break;
1289                 case YAFFS_OBJECT_TYPE_SYMLINK:
1290                         if (!S_ISLNK(mode)) {
1291                                 obj->yst_mode &= ~S_IFMT;
1292                                 obj->yst_mode |= S_IFLNK;
1293                         }
1294
1295                         break;
1296                 case YAFFS_OBJECT_TYPE_DIRECTORY:
1297                         if (!S_ISDIR(mode)) {
1298                                 obj->yst_mode &= ~S_IFMT;
1299                                 obj->yst_mode |= S_IFDIR;
1300                         }
1301
1302                         break;
1303                 case YAFFS_OBJECT_TYPE_UNKNOWN:
1304                 case YAFFS_OBJECT_TYPE_HARDLINK:
1305                 case YAFFS_OBJECT_TYPE_SPECIAL:
1306                 default:
1307                         /* TODO? */
1308                         break;
1309                 }
1310
1311                 inode->i_flags |= S_NOATIME;
1312
1313                 inode->i_ino = obj->obj_id;
1314                 inode->i_mode = obj->yst_mode;
1315                 inode->i_uid = obj->yst_uid;
1316                 inode->i_gid = obj->yst_gid;
1317 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
1318                 inode->i_blksize = inode->i_sb->s_blocksize;
1319 #endif
1320 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1321
1322                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1323                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1324                 inode->i_atime.tv_nsec = 0;
1325                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1326                 inode->i_mtime.tv_nsec = 0;
1327                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1328                 inode->i_ctime.tv_nsec = 0;
1329 #else
1330                 inode->i_rdev = obj->yst_rdev;
1331                 inode->i_atime = obj->yst_atime;
1332                 inode->i_mtime = obj->yst_mtime;
1333                 inode->i_ctime = obj->yst_ctime;
1334 #endif
1335                 inode->i_size = yaffs_get_obj_length(obj);
1336                 inode->i_blocks = (inode->i_size + 511) >> 9;
1337
1338                 inode->i_nlink = yaffs_get_obj_link_count(obj);
1339
1340                 yaffs_trace(YAFFS_TRACE_OS,
1341                         "yaffs_fill_inode mode %x uid %d gid %d size %d count %d",
1342                         inode->i_mode, inode->i_uid, inode->i_gid,
1343                         (int)inode->i_size, atomic_read(&inode->i_count));
1344
1345                 switch (obj->yst_mode & S_IFMT) {
1346                 default:        /* fifo, device or socket */
1347 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1348                         init_special_inode(inode, obj->yst_mode,
1349                                            old_decode_dev(obj->yst_rdev));
1350 #else
1351                         init_special_inode(inode, obj->yst_mode,
1352                                            (dev_t) (obj->yst_rdev));
1353 #endif
1354                         break;
1355                 case S_IFREG:   /* file */
1356                         inode->i_op = &yaffs_file_inode_operations;
1357                         inode->i_fop = &yaffs_file_operations;
1358                         inode->i_mapping->a_ops =
1359                             &yaffs_file_address_operations;
1360                         break;
1361                 case S_IFDIR:   /* directory */
1362                         inode->i_op = &yaffs_dir_inode_operations;
1363                         inode->i_fop = &yaffs_dir_operations;
1364                         break;
1365                 case S_IFLNK:   /* symlink */
1366                         inode->i_op = &yaffs_symlink_inode_operations;
1367                         break;
1368                 }
1369
1370                 yaffs_inode_to_obj_lv(inode) = obj;
1371
1372                 obj->my_inode = inode;
1373
1374         } else {
1375                 yaffs_trace(YAFFS_TRACE_OS,
1376                         "yaffs_fill_inode invalid parameters");
1377         }
1378
1379 }
1380
1381 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1382                               struct yaffs_obj *obj)
1383 {
1384         struct inode *inode;
1385
1386         if (!sb) {
1387                 yaffs_trace(YAFFS_TRACE_OS,
1388                         "yaffs_get_inode for NULL super_block!!");
1389                 return NULL;
1390
1391         }
1392
1393         if (!obj) {
1394                 yaffs_trace(YAFFS_TRACE_OS,
1395                         "yaffs_get_inode for NULL object!!");
1396                 return NULL;
1397
1398         }
1399
1400         yaffs_trace(YAFFS_TRACE_OS,
1401                 "yaffs_get_inode for object %d", obj->obj_id);
1402
1403         inode = Y_IGET(sb, obj->obj_id);
1404         if (IS_ERR(inode))
1405                 return NULL;
1406
1407         /* NB Side effect: iget calls back to yaffs_read_inode(). */
1408         /* iget also increments the inode's i_count */
1409         /* NB You can't be holding gross_lock or deadlock will happen! */
1410
1411         return inode;
1412 }
1413
1414 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1415                                 loff_t * pos)
1416 {
1417         struct yaffs_obj *obj;
1418         int n_written, ipos;
1419         struct inode *inode;
1420         struct yaffs_dev *dev;
1421
1422         obj = yaffs_dentry_to_obj(f->f_dentry);
1423
1424         dev = obj->my_dev;
1425
1426         yaffs_gross_lock(dev);
1427
1428         inode = f->f_dentry->d_inode;
1429
1430         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1431                 ipos = inode->i_size;
1432         else
1433                 ipos = *pos;
1434
1435         if (!obj)
1436                 yaffs_trace(YAFFS_TRACE_OS,
1437                         "yaffs_file_write: hey obj is null!");
1438         else
1439                 yaffs_trace(YAFFS_TRACE_OS,
1440                         "yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)",
1441                         (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos);
1442
1443         n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
1444
1445         yaffs_touch_super(dev);
1446
1447         yaffs_trace(YAFFS_TRACE_OS,
1448                 "yaffs_file_write: %d(%x) bytes written",
1449                 (unsigned)n, (unsigned)n);
1450
1451         if (n_written > 0) {
1452                 ipos += n_written;
1453                 *pos = ipos;
1454                 if (ipos > inode->i_size) {
1455                         inode->i_size = ipos;
1456                         inode->i_blocks = (ipos + 511) >> 9;
1457
1458                         yaffs_trace(YAFFS_TRACE_OS,
1459                                 "yaffs_file_write size updated to %d bytes, %d blocks",
1460                                 ipos, (int)(inode->i_blocks));
1461                 }
1462
1463         }
1464         yaffs_gross_unlock(dev);
1465         return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
1466 }
1467
1468 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1469 /* For now we just assume few parallel writes and check against a small number. */
1470 /* Todo: need to do this with a counter to handle parallel reads better */
1471
1472 static ssize_t yaffs_hold_space(struct file *f)
1473 {
1474         struct yaffs_obj *obj;
1475         struct yaffs_dev *dev;
1476
1477         int n_free_chunks;
1478
1479         obj = yaffs_dentry_to_obj(f->f_dentry);
1480
1481         dev = obj->my_dev;
1482
1483         yaffs_gross_lock(dev);
1484
1485         n_free_chunks = yaffs_get_n_free_chunks(dev);
1486
1487         yaffs_gross_unlock(dev);
1488
1489         return (n_free_chunks > 20) ? 1 : 0;
1490 }
1491
1492 static void yaffs_release_space(struct file *f)
1493 {
1494         struct yaffs_obj *obj;
1495         struct yaffs_dev *dev;
1496
1497         obj = yaffs_dentry_to_obj(f->f_dentry);
1498
1499         dev = obj->my_dev;
1500
1501         yaffs_gross_lock(dev);
1502
1503         yaffs_gross_unlock(dev);
1504 }
1505
1506 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1507 {
1508         struct yaffs_obj *obj;
1509         struct yaffs_dev *dev;
1510         struct yaffs_search_context *sc;
1511         struct inode *inode = f->f_dentry->d_inode;
1512         unsigned long offset, curoffs;
1513         struct yaffs_obj *l;
1514         int ret_val = 0;
1515
1516         char name[YAFFS_MAX_NAME_LENGTH + 1];
1517
1518         obj = yaffs_dentry_to_obj(f->f_dentry);
1519         dev = obj->my_dev;
1520
1521         yaffs_gross_lock(dev);
1522
1523         yaffs_dev_to_lc(dev)->readdir_process = current;
1524
1525         offset = f->f_pos;
1526
1527         sc = yaffs_new_search(obj);
1528         if (!sc) {
1529                 ret_val = -ENOMEM;
1530                 goto out;
1531         }
1532
1533         yaffs_trace(YAFFS_TRACE_OS,
1534                 "yaffs_readdir: starting at %d", (int)offset);
1535
1536         if (offset == 0) {
1537                 yaffs_trace(YAFFS_TRACE_OS,
1538                         "yaffs_readdir: entry . ino %d",
1539                         (int)inode->i_ino);
1540                 yaffs_gross_unlock(dev);
1541                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
1542                         yaffs_gross_lock(dev);
1543                         goto out;
1544                 }
1545                 yaffs_gross_lock(dev);
1546                 offset++;
1547                 f->f_pos++;
1548         }
1549         if (offset == 1) {
1550                 yaffs_trace(YAFFS_TRACE_OS,
1551                         "yaffs_readdir: entry .. ino %d",
1552                         (int)f->f_dentry->d_parent->d_inode->i_ino);
1553                 yaffs_gross_unlock(dev);
1554                 if (filldir(dirent, "..", 2, offset,
1555                             f->f_dentry->d_parent->d_inode->i_ino,
1556                             DT_DIR) < 0) {
1557                         yaffs_gross_lock(dev);
1558                         goto out;
1559                 }
1560                 yaffs_gross_lock(dev);
1561                 offset++;
1562                 f->f_pos++;
1563         }
1564
1565         curoffs = 1;
1566
1567         /* If the directory has changed since the open or last call to
1568            readdir, rewind to after the 2 canned entries. */
1569         if (f->f_version != inode->i_version) {
1570                 offset = 2;
1571                 f->f_pos = offset;
1572                 f->f_version = inode->i_version;
1573         }
1574
1575         while (sc->next_return) {
1576                 curoffs++;
1577                 l = sc->next_return;
1578                 if (curoffs >= offset) {
1579                         int this_inode = yaffs_get_obj_inode(l);
1580                         int this_type = yaffs_get_obj_type(l);
1581
1582                         yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
1583                         yaffs_trace(YAFFS_TRACE_OS,
1584                                 "yaffs_readdir: %s inode %d",
1585                                 name, yaffs_get_obj_inode(l));
1586
1587                         yaffs_gross_unlock(dev);
1588
1589                         if (filldir(dirent,
1590                                     name,
1591                                     strlen(name),
1592                                     offset, this_inode, this_type) < 0) {
1593                                 yaffs_gross_lock(dev);
1594                                 goto out;
1595                         }
1596
1597                         yaffs_gross_lock(dev);
1598
1599                         offset++;
1600                         f->f_pos++;
1601                 }
1602                 yaffs_search_advance(sc);
1603         }
1604
1605 out:
1606         yaffs_search_end(sc);
1607         yaffs_dev_to_lc(dev)->readdir_process = NULL;
1608         yaffs_gross_unlock(dev);
1609
1610         return ret_val;
1611 }
1612
1613 /*
1614  * File creation. Allocate an inode, and we're done..
1615  */
1616
1617 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1618 #define YCRED(x) x
1619 #else
1620 #define YCRED(x) (x->cred)
1621 #endif
1622
1623 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1624 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1625                        dev_t rdev)
1626 #else
1627 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1628                        int rdev)
1629 #endif
1630 {
1631         struct inode *inode;
1632
1633         struct yaffs_obj *obj = NULL;
1634         struct yaffs_dev *dev;
1635
1636         struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
1637
1638         int error = -ENOSPC;
1639         uid_t uid = YCRED(current)->fsuid;
1640         gid_t gid =
1641             (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1642
1643         if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1644                 mode |= S_ISGID;
1645
1646         if (parent) {
1647                 yaffs_trace(YAFFS_TRACE_OS,
1648                         "yaffs_mknod: parent object %d type %d",
1649                         parent->obj_id, parent->variant_type);
1650         } else {
1651                 yaffs_trace(YAFFS_TRACE_OS,
1652                         "yaffs_mknod: could not get parent object");
1653                 return -EPERM;
1654         }
1655
1656         yaffs_trace(YAFFS_TRACE_OS,
1657                 "yaffs_mknod: making oject for %s, mode %x dev %x",
1658                 dentry->d_name.name, mode, rdev);
1659
1660         dev = parent->my_dev;
1661
1662         yaffs_gross_lock(dev);
1663
1664         switch (mode & S_IFMT) {
1665         default:
1666                 /* Special (socket, fifo, device...) */
1667                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
1668 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1669                 obj =
1670                     yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1671                                          gid, old_encode_dev(rdev));
1672 #else
1673                 obj =
1674                     yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1675                                          gid, rdev);
1676 #endif
1677                 break;
1678         case S_IFREG:           /* file          */
1679                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
1680                 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
1681                                         gid);
1682                 break;
1683         case S_IFDIR:           /* directory */
1684                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
1685                 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
1686                                        uid, gid);
1687                 break;
1688         case S_IFLNK:           /* symlink */
1689                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
1690                 obj = NULL;     /* Do we ever get here? */
1691                 break;
1692         }
1693
1694         /* Can not call yaffs_get_inode() with gross lock held */
1695         yaffs_gross_unlock(dev);
1696
1697         if (obj) {
1698                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1699                 d_instantiate(dentry, inode);
1700                 update_dir_time(dir);
1701                 yaffs_trace(YAFFS_TRACE_OS,
1702                         "yaffs_mknod created object %d count = %d",
1703                         obj->obj_id, atomic_read(&inode->i_count));
1704                 error = 0;
1705                 yaffs_fill_inode_from_obj(dir, parent);
1706         } else {
1707                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
1708                 error = -ENOMEM;
1709         }
1710
1711         return error;
1712 }
1713
1714 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1715 {
1716         int ret_val;
1717         yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir");
1718         ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1719         return ret_val;
1720 }
1721
1722 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1723 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1724                         struct nameidata *n)
1725 #else
1726 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1727 #endif
1728 {
1729         yaffs_trace(YAFFS_TRACE_OS, "yaffs_create");
1730         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1731 }
1732
1733 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1734 {
1735         int ret_val;
1736
1737         struct yaffs_dev *dev;
1738         struct yaffs_obj *obj;
1739
1740         yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s",
1741                 (int)(dir->i_ino), dentry->d_name.name);
1742         obj = yaffs_inode_to_obj(dir);
1743         dev = obj->my_dev;
1744
1745         yaffs_gross_lock(dev);
1746
1747         ret_val = yaffs_unlinker(obj, dentry->d_name.name);
1748
1749         if (ret_val == YAFFS_OK) {
1750                 dentry->d_inode->i_nlink--;
1751                 dir->i_version++;
1752                 yaffs_gross_unlock(dev);
1753                 mark_inode_dirty(dentry->d_inode);
1754                 update_dir_time(dir);
1755                 return 0;
1756         }
1757         yaffs_gross_unlock(dev);
1758         return -ENOTEMPTY;
1759 }
1760
1761 /*
1762  * Create a link...
1763  */
1764 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1765                       struct dentry *dentry)
1766 {
1767         struct inode *inode = old_dentry->d_inode;
1768         struct yaffs_obj *obj = NULL;
1769         struct yaffs_obj *link = NULL;
1770         struct yaffs_dev *dev;
1771
1772         yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
1773
1774         obj = yaffs_inode_to_obj(inode);
1775         dev = obj->my_dev;
1776
1777         yaffs_gross_lock(dev);
1778
1779         if (!S_ISDIR(inode->i_mode))    /* Don't link directories */
1780                 link =
1781                     yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
1782                                    obj);
1783
1784         if (link) {
1785                 old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
1786                 d_instantiate(dentry, old_dentry->d_inode);
1787                 atomic_inc(&old_dentry->d_inode->i_count);
1788                 yaffs_trace(YAFFS_TRACE_OS,
1789                         "yaffs_link link count %d i_count %d",
1790                         old_dentry->d_inode->i_nlink,
1791                         atomic_read(&old_dentry->d_inode->i_count));
1792         }
1793
1794         yaffs_gross_unlock(dev);
1795
1796         if (link) {
1797                 update_dir_time(dir);
1798                 return 0;
1799         }
1800
1801         return -EPERM;
1802 }
1803
1804 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1805                          const char *symname)
1806 {
1807         struct yaffs_obj *obj;
1808         struct yaffs_dev *dev;
1809         uid_t uid = YCRED(current)->fsuid;
1810         gid_t gid =
1811             (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1812
1813         yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
1814
1815         dev = yaffs_inode_to_obj(dir)->my_dev;
1816         yaffs_gross_lock(dev);
1817         obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
1818                                    S_IFLNK | S_IRWXUGO, uid, gid, symname);
1819         yaffs_gross_unlock(dev);
1820
1821         if (obj) {
1822                 struct inode *inode;
1823
1824                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1825                 d_instantiate(dentry, inode);
1826                 update_dir_time(dir);
1827                 yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
1828                 return 0;
1829         } else {
1830                 yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
1831         }
1832
1833         return -ENOMEM;
1834 }
1835
1836 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1837 static int yaffs_sync_object(struct file *file, int datasync)
1838 #else
1839 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1840                              int datasync)
1841 #endif
1842 {
1843
1844         struct yaffs_obj *obj;
1845         struct yaffs_dev *dev;
1846 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1847         struct dentry *dentry = file->f_path.dentry;
1848 #endif
1849
1850         obj = yaffs_dentry_to_obj(dentry);
1851
1852         dev = obj->my_dev;
1853
1854         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1855                 "yaffs_sync_object");
1856         yaffs_gross_lock(dev);
1857         yaffs_flush_file(obj, 1, datasync);
1858         yaffs_gross_unlock(dev);
1859         return 0;
1860 }
1861
1862 /*
1863  * The VFS layer already does all the dentry stuff for rename.
1864  *
1865  * NB: POSIX says you can rename an object over an old object of the same name
1866  */
1867 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1868                         struct inode *new_dir, struct dentry *new_dentry)
1869 {
1870         struct yaffs_dev *dev;
1871         int ret_val = YAFFS_FAIL;
1872         struct yaffs_obj *target;
1873
1874         yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
1875         dev = yaffs_inode_to_obj(old_dir)->my_dev;
1876
1877         yaffs_gross_lock(dev);
1878
1879         /* Check if the target is an existing directory that is not empty. */
1880         target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
1881                                     new_dentry->d_name.name);
1882
1883         if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1884             !list_empty(&target->variant.dir_variant.children)) {
1885
1886                 yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
1887
1888                 ret_val = YAFFS_FAIL;
1889         } else {
1890                 /* Now does unlinking internally using shadowing mechanism */
1891                 yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
1892
1893                 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
1894                                            old_dentry->d_name.name,
1895                                            yaffs_inode_to_obj(new_dir),
1896                                            new_dentry->d_name.name);
1897         }
1898         yaffs_gross_unlock(dev);
1899
1900         if (ret_val == YAFFS_OK) {
1901                 if (target) {
1902                         new_dentry->d_inode->i_nlink--;
1903                         mark_inode_dirty(new_dentry->d_inode);
1904                 }
1905
1906                 update_dir_time(old_dir);
1907                 if (old_dir != new_dir)
1908                         update_dir_time(new_dir);
1909                 return 0;
1910         } else {
1911                 return -ENOTEMPTY;
1912         }
1913 }
1914
1915 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1916 {
1917         struct inode *inode = dentry->d_inode;
1918         int error = 0;
1919         struct yaffs_dev *dev;
1920
1921         yaffs_trace(YAFFS_TRACE_OS,
1922                 "yaffs_setattr of object %d",
1923                 yaffs_inode_to_obj(inode)->obj_id);
1924
1925         /* Fail if a requested resize >= 2GB */
1926         if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
1927                 error = -EINVAL;
1928
1929         if (error == 0)
1930                 error = inode_change_ok(inode, attr);
1931         if (error == 0) {
1932                 int result;
1933                 if (!error) {
1934                         error = yaffs_vfs_setattr(inode, attr);
1935                         yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
1936                         if (attr->ia_valid & ATTR_SIZE) {
1937                                 yaffs_vfs_setsize(inode, attr->ia_size);
1938                                 inode->i_blocks = (inode->i_size + 511) >> 9;
1939                         }
1940                 }
1941                 dev = yaffs_inode_to_obj(inode)->my_dev;
1942                 if (attr->ia_valid & ATTR_SIZE) {
1943                         yaffs_trace(YAFFS_TRACE_OS,
1944                                 "resize to %d(%x)",
1945                                 (int)(attr->ia_size),
1946                                 (int)(attr->ia_size));
1947                 }
1948                 yaffs_gross_lock(dev);
1949                 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
1950                 if (result == YAFFS_OK) {
1951                         error = 0;
1952                 } else {
1953                         error = -EPERM;
1954                 }
1955                 yaffs_gross_unlock(dev);
1956
1957         }
1958
1959         yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
1960
1961         return error;
1962 }
1963
1964 #ifdef CONFIG_YAFFS_XATTR
1965 static int yaffs_setxattr(struct dentry *dentry, const char *name,
1966                    const void *value, size_t size, int flags)
1967 {
1968         struct inode *inode = dentry->d_inode;
1969         int error = 0;
1970         struct yaffs_dev *dev;
1971         struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1972
1973         yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
1974
1975         if (error == 0) {
1976                 int result;
1977                 dev = obj->my_dev;
1978                 yaffs_gross_lock(dev);
1979                 result = yaffs_set_xattrib(obj, name, value, size, flags);
1980                 if (result == YAFFS_OK)
1981                         error = 0;
1982                 else if (result < 0)
1983                         error = result;
1984                 yaffs_gross_unlock(dev);
1985
1986         }
1987         yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
1988
1989         return error;
1990 }
1991
1992 static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name,
1993                         void *buff, size_t size)
1994 {
1995         struct inode *inode = dentry->d_inode;
1996         int error = 0;
1997         struct yaffs_dev *dev;
1998         struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1999
2000         yaffs_trace(YAFFS_TRACE_OS,
2001                 "yaffs_getxattr \"%s\" from object %d",
2002                 name, obj->obj_id);
2003
2004         if (error == 0) {
2005                 dev = obj->my_dev;
2006                 yaffs_gross_lock(dev);
2007                 error = yaffs_get_xattrib(obj, name, buff, size);
2008                 yaffs_gross_unlock(dev);
2009
2010         }
2011         yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
2012
2013         return error;
2014 }
2015
2016 static int yaffs_removexattr(struct dentry *dentry, const char *name)
2017 {
2018         struct inode *inode = dentry->d_inode;
2019         int error = 0;
2020         struct yaffs_dev *dev;
2021         struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2022
2023         yaffs_trace(YAFFS_TRACE_OS,
2024                 "yaffs_removexattr of object %d", obj->obj_id);
2025
2026         if (error == 0) {
2027                 int result;
2028                 dev = obj->my_dev;
2029                 yaffs_gross_lock(dev);
2030                 result = yaffs_remove_xattrib(obj, name);
2031                 if (result == YAFFS_OK)
2032                         error = 0;
2033                 else if (result < 0)
2034                         error = result;
2035                 yaffs_gross_unlock(dev);
2036
2037         }
2038         yaffs_trace(YAFFS_TRACE_OS,
2039                 "yaffs_removexattr done returning %d", error);
2040
2041         return error;
2042 }
2043
2044 static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
2045 {
2046         struct inode *inode = dentry->d_inode;
2047         int error = 0;
2048         struct yaffs_dev *dev;
2049         struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2050
2051         yaffs_trace(YAFFS_TRACE_OS,
2052                 "yaffs_listxattr of object %d", obj->obj_id);
2053
2054         if (error == 0) {
2055                 dev = obj->my_dev;
2056                 yaffs_gross_lock(dev);
2057                 error = yaffs_list_xattrib(obj, buff, size);
2058                 yaffs_gross_unlock(dev);
2059
2060         }
2061         yaffs_trace(YAFFS_TRACE_OS,
2062                 "yaffs_listxattr done returning %d", error);
2063
2064         return error;
2065 }
2066
2067 #endif
2068
2069 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2070 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
2071 {
2072         struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
2073         struct super_block *sb = dentry->d_sb;
2074 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2075 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
2076 {
2077         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2078 #else
2079 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
2080 {
2081         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2082 #endif
2083
2084         yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
2085
2086         yaffs_gross_lock(dev);
2087
2088         buf->f_type = YAFFS_MAGIC;
2089         buf->f_bsize = sb->s_blocksize;
2090         buf->f_namelen = 255;
2091
2092         if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
2093                 /* Do this if chunk size is not a power of 2 */
2094
2095                 uint64_t bytes_in_dev;
2096                 uint64_t bytes_free;
2097
2098                 bytes_in_dev =
2099                     ((uint64_t)
2100                      ((dev->param.end_block - dev->param.start_block +
2101                        1))) * ((uint64_t) (dev->param.chunks_per_block *
2102                                            dev->data_bytes_per_chunk));
2103
2104                 do_div(bytes_in_dev, sb->s_blocksize);  /* bytes_in_dev becomes the number of blocks */
2105                 buf->f_blocks = bytes_in_dev;
2106
2107                 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
2108                     ((uint64_t) (dev->data_bytes_per_chunk));
2109
2110                 do_div(bytes_free, sb->s_blocksize);
2111
2112                 buf->f_bfree = bytes_free;
2113
2114         } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
2115
2116                 buf->f_blocks =
2117                     (dev->param.end_block - dev->param.start_block + 1) *
2118                     dev->param.chunks_per_block /
2119                     (sb->s_blocksize / dev->data_bytes_per_chunk);
2120                 buf->f_bfree =
2121                     yaffs_get_n_free_chunks(dev) /
2122                     (sb->s_blocksize / dev->data_bytes_per_chunk);
2123         } else {
2124                 buf->f_blocks =
2125                     (dev->param.end_block - dev->param.start_block + 1) *
2126                     dev->param.chunks_per_block *
2127                     (dev->data_bytes_per_chunk / sb->s_blocksize);
2128
2129                 buf->f_bfree =
2130                     yaffs_get_n_free_chunks(dev) *
2131                     (dev->data_bytes_per_chunk / sb->s_blocksize);
2132         }
2133
2134         buf->f_files = 0;
2135         buf->f_ffree = 0;
2136         buf->f_bavail = buf->f_bfree;
2137
2138         yaffs_gross_unlock(dev);
2139         return 0;
2140 }
2141
2142 static void yaffs_flush_inodes(struct super_block *sb)
2143 {
2144         struct inode *iptr;
2145         struct yaffs_obj *obj;
2146
2147         list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
2148                 obj = yaffs_inode_to_obj(iptr);
2149                 if (obj) {
2150                         yaffs_trace(YAFFS_TRACE_OS,
2151                                 "flushing obj %d",
2152                                 obj->obj_id);
2153                         yaffs_flush_file(obj, 1, 0);
2154                 }
2155         }
2156 }
2157
2158 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
2159 {
2160         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2161         if (!dev)
2162                 return;
2163
2164         yaffs_flush_inodes(sb);
2165         yaffs_update_dirty_dirs(dev);
2166         yaffs_flush_whole_cache(dev);
2167         if (do_checkpoint)
2168                 yaffs_checkpoint_save(dev);
2169 }
2170
2171 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
2172 {
2173         unsigned erased_chunks =
2174             dev->n_erased_blocks * dev->param.chunks_per_block;
2175         struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2176         unsigned scattered = 0; /* Free chunks not in an erased block */
2177
2178         if (erased_chunks < dev->n_free_chunks)
2179                 scattered = (dev->n_free_chunks - erased_chunks);
2180
2181         if (!context->bg_running)
2182                 return 0;
2183         else if (scattered < (dev->param.chunks_per_block * 2))
2184                 return 0;
2185         else if (erased_chunks > dev->n_free_chunks / 2)
2186                 return 0;
2187         else if (erased_chunks > dev->n_free_chunks / 4)
2188                 return 1;
2189         else
2190                 return 2;
2191 }
2192
2193 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
2194 {
2195
2196         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2197         unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
2198         unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
2199         int do_checkpoint;
2200
2201         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2202                 "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
2203                 gc_urgent,
2204                 sb->s_dirt ? "dirty" : "clean",
2205                 request_checkpoint ? "checkpoint requested" : "no checkpoint",
2206                 oneshot_checkpoint ? " one-shot" : "");
2207
2208         yaffs_gross_lock(dev);
2209         do_checkpoint = ((request_checkpoint && !gc_urgent) ||
2210                          oneshot_checkpoint) && !dev->is_checkpointed;
2211
2212         if (sb->s_dirt || do_checkpoint) {
2213                 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
2214                 sb->s_dirt = 0;
2215                 if (oneshot_checkpoint)
2216                         yaffs_auto_checkpoint &= ~4;
2217         }
2218         yaffs_gross_unlock(dev);
2219
2220         return 0;
2221 }
2222
2223 /*
2224  * yaffs background thread functions .
2225  * yaffs_bg_thread_fn() the thread function
2226  * yaffs_bg_start() launches the background thread.
2227  * yaffs_bg_stop() cleans up the background thread.
2228  *
2229  * NB:
2230  * The thread should only run after the yaffs is initialised
2231  * The thread should be stopped before yaffs is unmounted.
2232  * The thread should not do any writing while the fs is in read only.
2233  */
2234
2235 #ifdef YAFFS_COMPILE_BACKGROUND
2236
2237 void yaffs_background_waker(unsigned long data)
2238 {
2239         wake_up_process((struct task_struct *)data);
2240 }
2241
2242 static int yaffs_bg_thread_fn(void *data)
2243 {
2244         struct yaffs_dev *dev = (struct yaffs_dev *)data;
2245         struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2246         unsigned long now = jiffies;
2247         unsigned long next_dir_update = now;
2248         unsigned long next_gc = now;
2249         unsigned long expires;
2250         unsigned int urgency;
2251
2252         int gc_result;
2253         struct timer_list timer;
2254
2255         yaffs_trace(YAFFS_TRACE_BACKGROUND,
2256                 "yaffs_background starting for dev %p", (void *)dev);
2257
2258 #ifdef YAFFS_COMPILE_FREEZER
2259         set_freezable();
2260 #endif
2261         while (context->bg_running) {
2262                 yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
2263
2264                 if (kthread_should_stop())
2265                         break;
2266
2267 #ifdef YAFFS_COMPILE_FREEZER
2268                 if (try_to_freeze())
2269                         continue;
2270 #endif
2271                 yaffs_gross_lock(dev);
2272
2273                 now = jiffies;
2274
2275                 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
2276                         yaffs_update_dirty_dirs(dev);
2277                         next_dir_update = now + HZ;
2278                 }
2279
2280                 if (time_after(now, next_gc) && yaffs_bg_enable) {
2281                         if (!dev->is_checkpointed) {
2282                                 urgency = yaffs_bg_gc_urgency(dev);
2283                                 gc_result = yaffs_bg_gc(dev, urgency);
2284                                 if (urgency > 1)
2285                                         next_gc = now + HZ / 20 + 1;
2286                                 else if (urgency > 0)
2287                                         next_gc = now + HZ / 10 + 1;
2288                                 else
2289                                         next_gc = now + HZ * 2;
2290                         } else  {
2291                                 /*
2292                                  * gc not running so set to next_dir_update
2293                                  * to cut down on wake ups
2294                                  */
2295                                 next_gc = next_dir_update;
2296                         }
2297                 }
2298                 yaffs_gross_unlock(dev);
2299 #if 1
2300                 expires = next_dir_update;
2301                 if (time_before(next_gc, expires))
2302                         expires = next_gc;
2303                 if (time_before(expires, now))
2304                         expires = now + HZ;
2305
2306                 Y_INIT_TIMER(&timer);
2307                 timer.expires = expires + 1;
2308                 timer.data = (unsigned long)current;
2309                 timer.function = yaffs_background_waker;
2310
2311                 set_current_state(TASK_INTERRUPTIBLE);
2312                 add_timer(&timer);
2313                 schedule();
2314                 del_timer_sync(&timer);
2315 #else
2316                 msleep(10);
2317 #endif
2318         }
2319
2320         return 0;
2321 }
2322
2323 static int yaffs_bg_start(struct yaffs_dev *dev)
2324 {
2325         int retval = 0;
2326         struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2327
2328         if (dev->read_only)
2329                 return -1;
2330
2331         context->bg_running = 1;
2332
2333         context->bg_thread = kthread_run(yaffs_bg_thread_fn,
2334                                          (void *)dev, "yaffs-bg-%d",
2335                                          context->mount_id);
2336
2337         if (IS_ERR(context->bg_thread)) {
2338                 retval = PTR_ERR(context->bg_thread);
2339                 context->bg_thread = NULL;
2340                 context->bg_running = 0;
2341         }
2342         return retval;
2343 }
2344
2345 static void yaffs_bg_stop(struct yaffs_dev *dev)
2346 {
2347         struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
2348
2349         ctxt->bg_running = 0;
2350
2351         if (ctxt->bg_thread) {
2352                 kthread_stop(ctxt->bg_thread);
2353                 ctxt->bg_thread = NULL;
2354         }
2355 }
2356 #else
2357 static int yaffs_bg_thread_fn(void *data)
2358 {
2359         return 0;
2360 }
2361
2362 static int yaffs_bg_start(struct yaffs_dev *dev)
2363 {
2364         return 0;
2365 }
2366
2367 static void yaffs_bg_stop(struct yaffs_dev *dev)
2368 {
2369 }
2370 #endif
2371
2372 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2373 static void yaffs_write_super(struct super_block *sb)
2374 #else
2375 static int yaffs_write_super(struct super_block *sb)
2376 #endif
2377 {
2378         unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2379
2380         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2381                 "yaffs_write_super %s",
2382                 request_checkpoint ? " checkpt" : "");
2383
2384         yaffs_do_sync_fs(sb, request_checkpoint);
2385
2386 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
2387         return 0;
2388 #endif
2389 }
2390
2391 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2392 static int yaffs_sync_fs(struct super_block *sb, int wait)
2393 #else
2394 static int yaffs_sync_fs(struct super_block *sb)
2395 #endif
2396 {
2397         unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2398
2399         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2400                 "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
2401
2402         yaffs_do_sync_fs(sb, request_checkpoint);
2403
2404         return 0;
2405 }
2406
2407 #ifdef YAFFS_USE_OWN_IGET
2408
2409 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
2410 {
2411         struct inode *inode;
2412         struct yaffs_obj *obj;
2413         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2414
2415         yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
2416
2417         inode = iget_locked(sb, ino);
2418         if (!inode)
2419                 return ERR_PTR(-ENOMEM);
2420         if (!(inode->i_state & I_NEW))
2421                 return inode;
2422
2423         /* NB This is called as a side effect of other functions, but
2424          * we had to release the lock to prevent deadlocks, so
2425          * need to lock again.
2426          */
2427
2428         yaffs_gross_lock(dev);
2429
2430         obj = yaffs_find_by_number(dev, inode->i_ino);
2431
2432         yaffs_fill_inode_from_obj(inode, obj);
2433
2434         yaffs_gross_unlock(dev);
2435
2436         unlock_new_inode(inode);
2437         return inode;
2438 }
2439
2440 #else
2441
2442 static void yaffs_read_inode(struct inode *inode)
2443 {
2444         /* NB This is called as a side effect of other functions, but
2445          * we had to release the lock to prevent deadlocks, so
2446          * need to lock again.
2447          */
2448
2449         struct yaffs_obj *obj;
2450         struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb);
2451
2452         yaffs_trace(YAFFS_TRACE_OS,
2453                 "yaffs_read_inode for %d", (int)inode->i_ino);
2454
2455         if (current != yaffs_dev_to_lc(dev)->readdir_process)
2456                 yaffs_gross_lock(dev);
2457
2458         obj = yaffs_find_by_number(dev, inode->i_ino);
2459
2460         yaffs_fill_inode_from_obj(inode, obj);
2461
2462         if (current != yaffs_dev_to_lc(dev)->readdir_process)
2463                 yaffs_gross_unlock(dev);
2464 }
2465
2466 #endif
2467
2468 static LIST_HEAD(yaffs_context_list);
2469 struct mutex yaffs_context_lock;
2470
2471 static void yaffs_put_super(struct super_block *sb)
2472 {
2473         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2474
2475         yaffs_trace(YAFFS_TRACE_OS, "yaffs_put_super");
2476
2477         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2478                 "Shutting down yaffs background thread");
2479         yaffs_bg_stop(dev);
2480         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2481                 "yaffs background thread shut down");
2482
2483         yaffs_gross_lock(dev);
2484
2485         yaffs_flush_super(sb, 1);
2486
2487         if (yaffs_dev_to_lc(dev)->put_super_fn)
2488                 yaffs_dev_to_lc(dev)->put_super_fn(sb);
2489
2490         yaffs_deinitialise(dev);
2491
2492         yaffs_gross_unlock(dev);
2493
2494         mutex_lock(&yaffs_context_lock);
2495         list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
2496         mutex_unlock(&yaffs_context_lock);
2497
2498         if (yaffs_dev_to_lc(dev)->spare_buffer) {
2499                 kfree(yaffs_dev_to_lc(dev)->spare_buffer);
2500                 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
2501         }
2502
2503         kfree(dev);
2504 }
2505
2506 static void yaffs_mtd_put_super(struct super_block *sb)
2507 {
2508         struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
2509
2510         if (mtd->sync)
2511                 mtd->sync(mtd);
2512
2513         put_mtd_device(mtd);
2514 }
2515
2516 static void yaffs_touch_super(struct yaffs_dev *dev)
2517 {
2518         struct super_block *sb = yaffs_dev_to_lc(dev)->super;
2519
2520         yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb);
2521         if (sb)
2522                 sb->s_dirt = 1;
2523 }
2524
2525 struct yaffs_options {
2526         int inband_tags;
2527         int skip_checkpoint_read;
2528         int skip_checkpoint_write;
2529         int no_cache;
2530         int tags_ecc_on;
2531         int tags_ecc_overridden;
2532         int lazy_loading_enabled;
2533         int lazy_loading_overridden;
2534         int empty_lost_and_found;
2535         int empty_lost_and_found_overridden;
2536 };
2537
2538 #define MAX_OPT_LEN 30
2539 static int yaffs_parse_options(struct yaffs_options *options,
2540                                const char *options_str)
2541 {
2542         char cur_opt[MAX_OPT_LEN + 1];
2543         int p;
2544         int error = 0;
2545
2546         /* Parse through the options which is a comma seperated list */
2547
2548         while (options_str && *options_str && !error) {
2549                 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2550                 p = 0;
2551
2552                 while (*options_str == ',')
2553                         options_str++;
2554
2555                 while (*options_str && *options_str != ',') {
2556                         if (p < MAX_OPT_LEN) {
2557                                 cur_opt[p] = *options_str;
2558                                 p++;
2559                         }
2560                         options_str++;
2561                 }
2562
2563                 if (!strcmp(cur_opt, "inband-tags")) {
2564                         options->inband_tags = 1;
2565                 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
2566                         options->tags_ecc_on = 0;
2567                         options->tags_ecc_overridden = 1;
2568                 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
2569                         options->tags_ecc_on = 1;
2570                         options->tags_ecc_overridden = 1;
2571                 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
2572                         options->lazy_loading_enabled = 0;
2573                         options->lazy_loading_overridden = 1;
2574                 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
2575                         options->lazy_loading_enabled = 1;
2576                         options->lazy_loading_overridden = 1;
2577                 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
2578                         options->empty_lost_and_found = 0;
2579                         options->empty_lost_and_found_overridden = 1;
2580                 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
2581                         options->empty_lost_and_found = 1;
2582                         options->empty_lost_and_found_overridden = 1;
2583                 } else if (!strcmp(cur_opt, "no-cache")) {
2584                         options->no_cache = 1;
2585                 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
2586                         options->skip_checkpoint_read = 1;
2587                 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
2588                         options->skip_checkpoint_write = 1;
2589                 } else if (!strcmp(cur_opt, "no-checkpoint")) {
2590                         options->skip_checkpoint_read = 1;
2591                         options->skip_checkpoint_write = 1;
2592                 } else {
2593                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2594                                cur_opt);
2595                         error = 1;
2596                 }
2597         }
2598
2599         return error;
2600 }
2601
2602 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2603                                                      struct super_block *sb,
2604                                                      void *data, int silent)
2605 {
2606         int n_blocks;
2607         struct inode *inode = NULL;
2608         struct dentry *root;
2609         struct yaffs_dev *dev = 0;
2610         char devname_buf[BDEVNAME_SIZE + 1];
2611         struct mtd_info *mtd;
2612         int err;
2613         char *data_str = (char *)data;
2614         struct yaffs_linux_context *context = NULL;
2615         struct yaffs_param *param;
2616
2617         int read_only = 0;
2618
2619         struct yaffs_options options;
2620
2621         unsigned mount_id;
2622         int found;
2623         struct yaffs_linux_context *context_iterator;
2624         struct list_head *l;
2625
2626         sb->s_magic = YAFFS_MAGIC;
2627         sb->s_op = &yaffs_super_ops;
2628         sb->s_flags |= MS_NOATIME;
2629
2630         read_only = ((sb->s_flags & MS_RDONLY) != 0);
2631
2632 #ifdef YAFFS_COMPILE_EXPORTFS
2633         sb->s_export_op = &yaffs_export_ops;
2634 #endif
2635
2636         if (!sb)
2637                 printk(KERN_INFO "yaffs: sb is NULL\n");
2638         else if (!sb->s_dev)
2639                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2640         else if (!yaffs_devname(sb, devname_buf))
2641                 printk(KERN_INFO "yaffs: devname is NULL\n");
2642         else
2643                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2644                        sb->s_dev,
2645                        yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
2646
2647         if (!data_str)
2648                 data_str = "";
2649
2650         printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2651
2652         memset(&options, 0, sizeof(options));
2653
2654         if (yaffs_parse_options(&options, data_str)) {
2655                 /* Option parsing failed */
2656                 return NULL;
2657         }
2658
2659         sb->s_blocksize = PAGE_CACHE_SIZE;
2660         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2661
2662         yaffs_trace(YAFFS_TRACE_OS,
2663                 "yaffs_read_super: Using yaffs%d", yaffs_version);
2664         yaffs_trace(YAFFS_TRACE_OS,
2665                 "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
2666
2667         yaffs_trace(YAFFS_TRACE_ALWAYS,
2668                 "yaffs: Attempting MTD mount of %u.%u,\"%s\"",
2669                 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2670                 yaffs_devname(sb, devname_buf));
2671
2672         /* Check it's an mtd device..... */
2673         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2674                 return NULL;    /* This isn't an mtd device */
2675
2676         /* Get the device */
2677         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2678         if (!mtd) {
2679                 yaffs_trace(YAFFS_TRACE_ALWAYS,
2680                         "yaffs: MTD device #%u doesn't appear to exist",
2681                         MINOR(sb->s_dev));
2682                 return NULL;
2683         }
2684         /* Check it's NAND */
2685         if (mtd->type != MTD_NANDFLASH) {
2686                 yaffs_trace(YAFFS_TRACE_ALWAYS,
2687                         "yaffs: MTD device is not NAND it's type %d",
2688                         mtd->type);
2689                 return NULL;
2690         }
2691
2692         yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->erase);
2693         yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->read);
2694         yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->write);
2695         yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->read_oob);
2696         yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->write_oob);
2697         yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->block_isbad);
2698         yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->block_markbad);
2699         yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
2700         yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
2701         yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
2702 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
2703         yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size);
2704 #else
2705         yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
2706 #endif
2707
2708 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2709
2710         if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
2711                 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
2712                 yaffs_version = 2;
2713         }
2714
2715         /* Added NCB 26/5/2006 for completeness */
2716         if (yaffs_version == 2 && !options.inband_tags
2717             && WRITE_SIZE(mtd) == 512) {
2718                 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
2719                 yaffs_version = 1;
2720         }
2721 #endif
2722
2723         if (yaffs_version == 2) {
2724                 /* Check for version 2 style functions */
2725                 if (!mtd->erase ||
2726                     !mtd->block_isbad ||
2727                     !mtd->block_markbad || !mtd->read || !mtd->write ||
2728 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2729                     !mtd->read_oob || !mtd->write_oob) {
2730 #else
2731                     !mtd->write_ecc ||
2732                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2733 #endif
2734                         yaffs_trace(YAFFS_TRACE_ALWAYS,
2735                                 "MTD device does not support required functions"
2736                         );
2737                         return NULL;
2738                 }
2739
2740                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2741                      mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2742                     !options.inband_tags) {
2743                         yaffs_trace(YAFFS_TRACE_ALWAYS,
2744                                 "MTD device does not have the right page sizes"
2745                         );
2746                         return NULL;
2747                 }
2748         } else {
2749                 /* Check for V1 style functions */
2750                 if (!mtd->erase || !mtd->read || !mtd->write ||
2751 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2752                     !mtd->read_oob || !mtd->write_oob) {
2753 #else
2754                     !mtd->write_ecc ||
2755                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2756 #endif
2757                         yaffs_trace(YAFFS_TRACE_ALWAYS,
2758                                 "MTD device does not support required functions"
2759                         );
2760                         return NULL;
2761                 }
2762
2763                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2764                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2765                         yaffs_trace(YAFFS_TRACE_ALWAYS,
2766                                 "MTD device does not support have the right page sizes"
2767                         );
2768                         return NULL;
2769                 }
2770         }
2771
2772         /* OK, so if we got here, we have an MTD that's NAND and looks
2773          * like it has the right capabilities
2774          * Set the struct yaffs_dev up for mtd
2775          */
2776
2777         if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2778                 read_only = 1;
2779                 printk(KERN_INFO
2780                        "yaffs: mtd is read only, setting superblock read only\n"
2781                 );
2782                 sb->s_flags |= MS_RDONLY;
2783         }
2784
2785         dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2786         context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2787
2788         if (!dev || !context) {
2789                 if (dev)
2790                         kfree(dev);
2791                 if (context)
2792                         kfree(context);
2793                 dev = NULL;
2794                 context = NULL;
2795         }
2796
2797         if (!dev) {
2798                 /* Deep shit could not allocate device structure */
2799                 yaffs_trace(YAFFS_TRACE_ALWAYS,
2800                         "yaffs_read_super: Failed trying to allocate struct yaffs_dev."
2801                 );
2802                 return NULL;
2803         }
2804         memset(dev, 0, sizeof(struct yaffs_dev));
2805         param = &(dev->param);
2806
2807         memset(context, 0, sizeof(struct yaffs_linux_context));
2808         dev->os_context = context;
2809         INIT_LIST_HEAD(&(context->context_list));
2810         context->dev = dev;
2811         context->super = sb;
2812
2813         dev->read_only = read_only;
2814
2815 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2816         sb->s_fs_info = dev;
2817 #else
2818         sb->u.generic_sbp = dev;
2819 #endif
2820
2821         dev->driver_context = mtd;
2822         param->name = mtd->name;
2823
2824         /* Set up the memory size parameters.... */
2825
2826         n_blocks =
2827             YCALCBLOCKS(mtd->size,
2828                         (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2829
2830         param->start_block = 0;
2831         param->end_block = n_blocks - 1;
2832         param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2833         param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2834         param->n_reserved_blocks = 5;
2835         param->n_caches = (options.no_cache) ? 0 : 10;
2836         param->inband_tags = options.inband_tags;
2837
2838 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2839         param->disable_lazy_load = 1;
2840 #endif
2841 #ifdef CONFIG_YAFFS_XATTR
2842         param->enable_xattr = 1;
2843 #endif
2844         if (options.lazy_loading_overridden)
2845                 param->disable_lazy_load = !options.lazy_loading_enabled;
2846
2847 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2848         param->no_tags_ecc = 1;
2849 #endif
2850
2851 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2852 #else
2853         param->defered_dir_update = 1;
2854 #endif
2855
2856         if (options.tags_ecc_overridden)
2857                 param->no_tags_ecc = !options.tags_ecc_on;
2858
2859 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2860         param->empty_lost_n_found = 1;
2861 #endif
2862
2863 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2864         param->refresh_period = 0;
2865 #else
2866         param->refresh_period = 500;
2867 #endif
2868
2869 #ifdef CONFIG_YAFFS__ALWAYS_CHECK_CHUNK_ERASED
2870         param->always_check_erased = 1;
2871 #endif
2872
2873         if (options.empty_lost_and_found_overridden)
2874                 param->empty_lost_n_found = options.empty_lost_and_found;
2875
2876         /* ... and the functions. */
2877         if (yaffs_version == 2) {
2878                 param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
2879                 param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
2880                 param->bad_block_fn = nandmtd2_mark_block_bad;
2881                 param->query_block_fn = nandmtd2_query_block;
2882                 yaffs_dev_to_lc(dev)->spare_buffer =
2883                                 kmalloc(mtd->oobsize, GFP_NOFS);
2884                 param->is_yaffs2 = 1;
2885 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2886                 param->total_bytes_per_chunk = mtd->writesize;
2887                 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2888 #else
2889                 param->total_bytes_per_chunk = mtd->oobblock;
2890                 param->chunks_per_block = mtd->erasesize / mtd->oobblock;
2891 #endif
2892                 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2893
2894                 param->start_block = 0;
2895                 param->end_block = n_blocks - 1;
2896         } else {
2897 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2898                 /* use the MTD interface in yaffs_mtdif1.c */
2899                 param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
2900                 param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
2901                 param->bad_block_fn = nandmtd1_mark_block_bad;
2902                 param->query_block_fn = nandmtd1_query_block;
2903 #else
2904                 param->write_chunk_fn = nandmtd_write_chunk;
2905                 param->read_chunk_fn = nandmtd_read_chunk;
2906 #endif
2907                 param->is_yaffs2 = 0;
2908         }
2909         /* ... and common functions */
2910         param->erase_fn = nandmtd_erase_block;
2911         param->initialise_flash_fn = nandmtd_initialise;
2912
2913         yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
2914
2915         param->sb_dirty_fn = yaffs_touch_super;
2916         param->gc_control = yaffs_gc_control_callback;
2917
2918         yaffs_dev_to_lc(dev)->super = sb;
2919
2920 #ifndef CONFIG_YAFFS_DOES_ECC
2921         param->use_nand_ecc = 1;
2922 #endif
2923
2924 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2925         param->wide_tnodes_disabled = 1;
2926 #endif
2927
2928         param->skip_checkpt_rd = options.skip_checkpoint_read;
2929         param->skip_checkpt_wr = options.skip_checkpoint_write;
2930
2931         mutex_lock(&yaffs_context_lock);
2932         /* Get a mount id */
2933         found = 0;
2934         for (mount_id = 0; !found; mount_id++) {
2935                 found = 1;
2936                 list_for_each(l, &yaffs_context_list) {
2937                         context_iterator =
2938                             list_entry(l, struct yaffs_linux_context,
2939                                        context_list);
2940                         if (context_iterator->mount_id == mount_id)
2941                                 found = 0;
2942                 }
2943         }
2944         context->mount_id = mount_id;
2945
2946         list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
2947                       &yaffs_context_list);
2948         mutex_unlock(&yaffs_context_lock);
2949
2950         /* Directory search handling... */
2951         INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2952         param->remove_obj_fn = yaffs_remove_obj_callback;
2953
2954         mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
2955
2956         yaffs_gross_lock(dev);
2957
2958         err = yaffs_guts_initialise(dev);
2959
2960         yaffs_trace(YAFFS_TRACE_OS,
2961                 "yaffs_read_super: guts initialised %s",
2962                 (err == YAFFS_OK) ? "OK" : "FAILED");
2963
2964         if (err == YAFFS_OK)
2965                 yaffs_bg_start(dev);
2966
2967         if (!context->bg_thread)
2968                 param->defered_dir_update = 0;
2969
2970         /* Release lock before yaffs_get_inode() */
2971         yaffs_gross_unlock(dev);
2972
2973         /* Create root inode */
2974         if (err == YAFFS_OK)
2975                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
2976
2977         if (!inode)
2978                 return NULL;
2979
2980         inode->i_op = &yaffs_dir_inode_operations;
2981         inode->i_fop = &yaffs_dir_operations;
2982
2983         yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
2984
2985         root = d_alloc_root(inode);
2986
2987         yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done");
2988
2989         if (!root) {
2990                 iput(inode);
2991                 return NULL;
2992         }
2993         sb->s_root = root;
2994         sb->s_dirt = !dev->is_checkpointed;
2995         yaffs_trace(YAFFS_TRACE_ALWAYS,
2996                 "yaffs_read_super: is_checkpointed %d",
2997                 dev->is_checkpointed);
2998
2999         yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
3000         return sb;
3001 }
3002
3003 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3004 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
3005                                          int silent)
3006 {
3007         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
3008 }
3009
3010 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3011 static int yaffs_read_super(struct file_system_type *fs,
3012                             int flags, const char *dev_name,
3013                             void *data, struct vfsmount *mnt)
3014 {
3015
3016         return get_sb_bdev(fs, flags, dev_name, data,
3017                            yaffs_internal_read_super_mtd, mnt);
3018 }
3019 #else
3020 static struct super_block *yaffs_read_super(struct file_system_type *fs,
3021                                             int flags, const char *dev_name,
3022                                             void *data)
3023 {
3024
3025         return get_sb_bdev(fs, flags, dev_name, data,
3026                            yaffs_internal_read_super_mtd);
3027 }
3028 #endif
3029
3030 static struct file_system_type yaffs_fs_type = {
3031         .owner = THIS_MODULE,
3032         .name = "yaffs",
3033         .get_sb = yaffs_read_super,
3034         .kill_sb = kill_block_super,
3035         .fs_flags = FS_REQUIRES_DEV,
3036 };
3037 #else
3038 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
3039                                             int silent)
3040 {
3041         return yaffs_internal_read_super(1, sb, data, silent);
3042 }
3043
3044 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
3045                       FS_REQUIRES_DEV);
3046 #endif
3047
3048 #ifdef CONFIG_YAFFS_YAFFS2
3049
3050 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3051 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
3052                                           int silent)
3053 {
3054         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
3055 }
3056
3057 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3058 static int yaffs2_read_super(struct file_system_type *fs,
3059                              int flags, const char *dev_name, void *data,
3060                              struct vfsmount *mnt)
3061 {
3062         return get_sb_bdev(fs, flags, dev_name, data,
3063                            yaffs2_internal_read_super_mtd, mnt);
3064 }
3065 #else
3066 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
3067                                              int flags, const char *dev_name,
3068                                              void *data)
3069 {
3070
3071         return get_sb_bdev(fs, flags, dev_name, data,
3072                            yaffs2_internal_read_super_mtd);
3073 }
3074 #endif
3075
3076 static struct file_system_type yaffs2_fs_type = {
3077         .owner = THIS_MODULE,
3078         .name = "yaffs2",
3079         .get_sb = yaffs2_read_super,
3080         .kill_sb = kill_block_super,
3081         .fs_flags = FS_REQUIRES_DEV,
3082 };
3083 #else
3084 static struct super_block *yaffs2_read_super(struct super_block *sb,
3085                                              void *data, int silent)
3086 {
3087         return yaffs_internal_read_super(2, sb, data, silent);
3088 }
3089
3090 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
3091                       FS_REQUIRES_DEV);
3092 #endif
3093
3094 #endif /* CONFIG_YAFFS_YAFFS2 */
3095
3096 static struct proc_dir_entry *my_proc_entry;
3097
3098 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
3099 {
3100         struct yaffs_param *param = &dev->param;
3101
3102         buf += sprintf(buf, "start_block.......... %d\n", param->start_block);
3103         buf += sprintf(buf, "end_block............ %d\n", param->end_block);
3104         buf += sprintf(buf, "total_bytes_per_chunk %d\n",
3105                                 param->total_bytes_per_chunk);
3106         buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc);
3107         buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc);
3108         buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2);
3109         buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags);
3110         buf += sprintf(buf, "empty_lost_n_found... %d\n",
3111                                 param->empty_lost_n_found);
3112         buf += sprintf(buf, "disable_lazy_load.... %d\n",
3113                                 param->disable_lazy_load);
3114         buf += sprintf(buf, "refresh_period....... %d\n",
3115                                 param->refresh_period);
3116         buf += sprintf(buf, "n_caches............. %d\n", param->n_caches);
3117         buf += sprintf(buf, "n_reserved_blocks.... %d\n",
3118                                 param->n_reserved_blocks);
3119         buf += sprintf(buf, "always_check_erased.. %d\n",
3120                                 param->always_check_erased);
3121         buf += sprintf(buf, "\n");
3122
3123         return buf;
3124 }
3125
3126 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
3127 {
3128         buf += sprintf(buf, "data_bytes_per_chunk. %d\n",
3129                                 dev->data_bytes_per_chunk);
3130         buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
3131         buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
3132         buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
3133         buf += sprintf(buf, "blocks_in_checkpt.... %d\n",
3134                                 dev->blocks_in_checkpt);
3135         buf += sprintf(buf, "\n");
3136         buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
3137         buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
3138         buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
3139         buf += sprintf(buf, "\n");
3140         buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
3141         buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
3142         buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
3143         buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
3144         buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
3145         buf += sprintf(buf, "passive_gc_count..... %u\n",
3146                                 dev->passive_gc_count);
3147         buf += sprintf(buf, "oldest_dirty_gc_count %u\n",
3148                                 dev->oldest_dirty_gc_count);
3149         buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
3150         buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
3151         buf += sprintf(buf, "n_retired_writes..... %u\n",
3152                                 dev->n_retired_writes);
3153         buf += sprintf(buf, "n_retired_blocks..... %u\n",
3154                                 dev->n_retired_blocks);
3155         buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
3156         buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
3157         buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n",
3158                                 dev->n_tags_ecc_fixed);
3159         buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n",
3160                                 dev->n_tags_ecc_unfixed);
3161         buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
3162         buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
3163         buf += sprintf(buf, "n_unlinked_files..... %u\n",
3164                                 dev->n_unlinked_files);
3165         buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
3166         buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
3167
3168         return buf;
3169 }
3170
3171 static int yaffs_proc_read(char *page,
3172                            char **start,
3173                            off_t offset, int count, int *eof, void *data)
3174 {
3175         struct list_head *item;
3176         char *buf = page;
3177         int step = offset;
3178         int n = 0;
3179
3180         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
3181          * We use 'offset' (*ppos) to indicate where we are in dev_list.
3182          * This also assumes the user has posted a read buffer large
3183          * enough to hold the complete output; but that's life in /proc.
3184          */
3185
3186         *(int *)start = 1;
3187
3188         /* Print header first */
3189         if (step == 0)
3190                 buf +=
3191                     sprintf(buf,
3192                             "Multi-version YAFFS built:" __DATE__ " " __TIME__
3193                             "\n");
3194         else if (step == 1)
3195                 buf += sprintf(buf, "\n");
3196         else {
3197                 step -= 2;
3198
3199                 mutex_lock(&yaffs_context_lock);
3200
3201                 /* Locate and print the Nth entry.  Order N-squared but N is small. */
3202                 list_for_each(item, &yaffs_context_list) {
3203                         struct yaffs_linux_context *dc =
3204                             list_entry(item, struct yaffs_linux_context,
3205                                        context_list);
3206                         struct yaffs_dev *dev = dc->dev;
3207
3208                         if (n < (step & ~1)) {
3209                                 n += 2;
3210                                 continue;
3211                         }
3212                         if ((step & 1) == 0) {
3213                                 buf +=
3214                                     sprintf(buf, "\nDevice %d \"%s\"\n", n,
3215                                             dev->param.name);
3216                                 buf = yaffs_dump_dev_part0(buf, dev);
3217                         } else {
3218                                 buf = yaffs_dump_dev_part1(buf, dev);
3219                         }
3220
3221                         break;
3222                 }
3223                 mutex_unlock(&yaffs_context_lock);
3224         }
3225
3226         return buf - page < count ? buf - page : count;
3227 }
3228
3229 /**
3230  * Set the verbosity of the warnings and error messages.
3231  *
3232  * Note that the names can only be a..z or _ with the current code.
3233  */
3234
3235 static struct {
3236         char *mask_name;
3237         unsigned mask_bitfield;
3238 } mask_flags[] = {
3239         {"allocate", YAFFS_TRACE_ALLOCATE},
3240         {"always", YAFFS_TRACE_ALWAYS},
3241         {"background", YAFFS_TRACE_BACKGROUND},
3242         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
3243         {"buffers", YAFFS_TRACE_BUFFERS},
3244         {"bug", YAFFS_TRACE_BUG},
3245         {"checkpt", YAFFS_TRACE_CHECKPOINT},
3246         {"deletion", YAFFS_TRACE_DELETION},
3247         {"erase", YAFFS_TRACE_ERASE},
3248         {"error", YAFFS_TRACE_ERROR},
3249         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
3250         {"gc", YAFFS_TRACE_GC},
3251         {"lock", YAFFS_TRACE_LOCK},
3252         {"mtd", YAFFS_TRACE_MTD},
3253         {"nandaccess", YAFFS_TRACE_NANDACCESS},
3254         {"os", YAFFS_TRACE_OS},
3255         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
3256         {"scan", YAFFS_TRACE_SCAN},
3257         {"mount", YAFFS_TRACE_MOUNT},
3258         {"tracing", YAFFS_TRACE_TRACING},
3259         {"sync", YAFFS_TRACE_SYNC},
3260         {"write", YAFFS_TRACE_WRITE},
3261         {"verify", YAFFS_TRACE_VERIFY},
3262         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
3263         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
3264         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
3265         {"all", 0xffffffff},
3266         {"none", 0},
3267         {NULL, 0},
3268 };
3269
3270 #define MAX_MASK_NAME_LENGTH 40
3271 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
3272                                           unsigned long count, void *data)
3273 {
3274         unsigned rg = 0, mask_bitfield;
3275         char *end;
3276         char *mask_name;
3277         const char *x;
3278         char substring[MAX_MASK_NAME_LENGTH + 1];
3279         int i;
3280         int done = 0;
3281         int add, len = 0;
3282         int pos = 0;
3283
3284         rg = yaffs_trace_mask;
3285
3286         while (!done && (pos < count)) {
3287                 done = 1;
3288                 while ((pos < count) && isspace(buf[pos]))
3289                         pos++;
3290
3291                 switch (buf[pos]) {
3292                 case '+':
3293                 case '-':
3294                 case '=':
3295                         add = buf[pos];
3296                         pos++;
3297                         break;
3298
3299                 default:
3300                         add = ' ';
3301                         break;
3302                 }
3303                 mask_name = NULL;
3304
3305                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
3306
3307                 if (end > buf + pos) {
3308                         mask_name = "numeral";
3309                         len = end - (buf + pos);
3310                         pos += len;
3311                         done = 0;
3312                 } else {
3313                         for (x = buf + pos, i = 0;
3314                              (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
3315                              i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
3316                                 substring[i] = *x;
3317                         substring[i] = '\0';
3318
3319                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3320                                 if (strcmp(substring, mask_flags[i].mask_name)
3321                                     == 0) {
3322                                         mask_name = mask_flags[i].mask_name;
3323                                         mask_bitfield =
3324                                             mask_flags[i].mask_bitfield;
3325                                         done = 0;
3326                                         break;
3327                                 }
3328                         }
3329                 }
3330
3331                 if (mask_name != NULL) {
3332                         done = 0;
3333                         switch (add) {
3334                         case '-':
3335                                 rg &= ~mask_bitfield;
3336                                 break;
3337                         case '+':
3338                                 rg |= mask_bitfield;
3339                                 break;
3340                         case '=':
3341                                 rg = mask_bitfield;
3342                                 break;
3343                         default:
3344                                 rg |= mask_bitfield;
3345                                 break;
3346                         }
3347                 }
3348         }
3349
3350         yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
3351
3352         printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
3353
3354         if (rg & YAFFS_TRACE_ALWAYS) {
3355                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3356                         char flag;
3357                         flag = ((rg & mask_flags[i].mask_bitfield) ==
3358                                 mask_flags[i].mask_bitfield) ? '+' : '-';
3359                         printk(KERN_DEBUG "%c%s\n", flag,
3360                                mask_flags[i].mask_name);
3361                 }
3362         }
3363
3364         return count;
3365 }
3366
3367 static int yaffs_proc_write(struct file *file, const char *buf,
3368                             unsigned long count, void *data)
3369 {
3370         return yaffs_proc_write_trace_options(file, buf, count, data);
3371 }
3372
3373 /* Stuff to handle installation of file systems */
3374 struct file_system_to_install {
3375         struct file_system_type *fst;
3376         int installed;
3377 };
3378
3379 static struct file_system_to_install fs_to_install[] = {
3380         {&yaffs_fs_type, 0},
3381         {&yaffs2_fs_type, 0},
3382         {NULL, 0}
3383 };
3384
3385 static int __init init_yaffs_fs(void)
3386 {
3387         int error = 0;
3388         struct file_system_to_install *fsinst;
3389
3390         yaffs_trace(YAFFS_TRACE_ALWAYS,
3391                 "yaffs built " __DATE__ " " __TIME__ " Installing.");
3392
3393 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
3394         yaffs_trace(YAFFS_TRACE_ALWAYS,
3395                 " \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n"
3396         );
3397 #endif
3398
3399         mutex_init(&yaffs_context_lock);
3400
3401         /* Install the proc_fs entries */
3402         my_proc_entry = create_proc_entry("yaffs",
3403                                           S_IRUGO | S_IFREG, YPROC_ROOT);
3404
3405         if (my_proc_entry) {
3406                 my_proc_entry->write_proc = yaffs_proc_write;
3407                 my_proc_entry->read_proc = yaffs_proc_read;
3408                 my_proc_entry->data = NULL;
3409         } else {
3410                 return -ENOMEM;
3411         }
3412
3413         /* Now add the file system entries */
3414
3415         fsinst = fs_to_install;
3416
3417         while (fsinst->fst && !error) {
3418                 error = register_filesystem(fsinst->fst);
3419                 if (!error)
3420                         fsinst->installed = 1;
3421                 fsinst++;
3422         }
3423
3424         /* Any errors? uninstall  */
3425         if (error) {
3426                 fsinst = fs_to_install;
3427
3428                 while (fsinst->fst) {
3429                         if (fsinst->installed) {
3430                                 unregister_filesystem(fsinst->fst);
3431                                 fsinst->installed = 0;
3432                         }
3433                         fsinst++;
3434                 }
3435         }
3436
3437         return error;
3438 }
3439
3440 static void __exit exit_yaffs_fs(void)
3441 {
3442
3443         struct file_system_to_install *fsinst;
3444
3445         yaffs_trace(YAFFS_TRACE_ALWAYS,
3446                 "yaffs built " __DATE__ " " __TIME__ " removing.");
3447
3448         remove_proc_entry("yaffs", YPROC_ROOT);
3449
3450         fsinst = fs_to_install;
3451
3452         while (fsinst->fst) {
3453                 if (fsinst->installed) {
3454                         unregister_filesystem(fsinst->fst);
3455                         fsinst->installed = 0;
3456                 }
3457                 fsinst++;
3458         }
3459 }
3460
3461 module_init(init_yaffs_fs)
3462     module_exit(exit_yaffs_fs)
3463
3464     MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3465 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
3466 MODULE_LICENSE("GPL");