yaffs_vfs_multi.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2011 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 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
  76 #include <linux/smp_lock.h>
  77 #endif
  78 #include <linux/pagemap.h>
  79 #include <linux/mtd/mtd.h>
  80 #include <linux/interrupt.h>
  81 #include <linux/string.h>
  82 #include <linux/ctype.h>
  83
  84 #if (YAFFS_NEW_FOLLOW_LINK == 1)
  85 #include <linux/namei.h>
  86 #endif
  87
  88 #ifdef YAFFS_COMPILE_EXPORTFS
  89 #include <linux/exportfs.h>
  90 #endif
  91
  92 #ifdef YAFFS_COMPILE_BACKGROUND
  93 #include <linux/kthread.h>
  94 #include <linux/delay.h>
  95 #endif
  96 #ifdef YAFFS_COMPILE_FREEZER
  97 #include <linux/freezer.h>
  98 #endif
  99
 100 #include <asm/div64.h>
 101
 102 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 103
 104 #include <linux/statfs.h>
 105
 106 #define UnlockPage(p) unlock_page(p)
 107 #define Page_Uptodate(page)     test_bit(PG_uptodate, &(page)->flags)
 108
 109 /* FIXME: use sb->s_id instead ? */
 110 #define yaffs_devname(sb, buf)  bdevname(sb->s_bdev, buf)
 111
 112 #else
 113
 114 #include <linux/locks.h>
 115 #define BDEVNAME_SIZE           0
 116 #define yaffs_devname(sb, buf)  kdevname(sb->s_dev)
 117
 118 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
 119 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
 120 #define __user
 121 #endif
 122
 123 #endif
 124
 125 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
 126 #define YPROC_ROOT  (&proc_root)
 127 #else
 128 #define YPROC_ROOT  NULL
 129 #endif
 130
 131 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
 132 #define Y_INIT_TIMER(a) init_timer(a)
 133 #else
 134 #define Y_INIT_TIMER(a) init_timer_on_stack(a)
 135 #endif
 136
 137 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 138 #define WRITE_SIZE_STR "writesize"
 139 #define WRITE_SIZE(mtd) ((mtd)->writesize)
 140 #else
 141 #define WRITE_SIZE_STR "oobblock"
 142 #define WRITE_SIZE(mtd) ((mtd)->oobblock)
 143 #endif
 144
 145 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
 146 #define YAFFS_USE_WRITE_BEGIN_END 1
 147 #else
 148 #define YAFFS_USE_WRITE_BEGIN_END 0
 149 #endif
 150
 151
 152
 153 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
 154 #define set_nlink(inode, count)  do { (inode)->i_nlink = (count); } while(0)
 155 #endif
 156
 157 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
 158 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
 159 {
 160         uint64_t result = partition_size;
 161         do_div(result, block_size);
 162         return (uint32_t) result;
 163 }
 164 #else
 165 #define YCALCBLOCKS(s, b) ((s)/(b))
 166 #endif
 167
 168 #include <linux/uaccess.h>
 169 #include <linux/mtd/mtd.h>
 170
 171 #include "yportenv.h"
 172 #include "yaffs_trace.h"
 173 #include "yaffs_guts.h"
 174 #include "yaffs_attribs.h"
 175
 176 #include "yaffs_linux.h"
 177
 178 #include "yaffs_mtdif.h"
 179 #include "yaffs_mtdif1.h"
 180 #include "yaffs_mtdif2.h"
 181
 182 unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
 183 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
 184 unsigned int yaffs_auto_checkpoint = 1;
 185 unsigned int yaffs_gc_control = 1;
 186 unsigned int yaffs_bg_enable = 1;
 187 unsigned int yaffs_auto_select = 1;
 188 /* Module Parameters */
 189 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 190 module_param(yaffs_trace_mask, uint, 0644);
 191 module_param(yaffs_wr_attempts, uint, 0644);
 192 module_param(yaffs_auto_checkpoint, uint, 0644);
 193 module_param(yaffs_gc_control, uint, 0644);
 194 module_param(yaffs_bg_enable, uint, 0644);
 195 #else
 196 MODULE_PARM(yaffs_trace_mask, "i");
 197 MODULE_PARM(yaffs_wr_attempts, "i");
 198 MODULE_PARM(yaffs_auto_checkpoint, "i");
 199 MODULE_PARM(yaffs_gc_control, "i");
 200 #endif
 201
 202 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
 203 /* use iget and read_inode */
 204 #define Y_IGET(sb, inum) iget((sb), (inum))
 205 static void yaffs_read_inode(struct inode *inode);
 206
 207 #else
 208 /* Call local equivalent */
 209 #define YAFFS_USE_OWN_IGET
 210 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
 211
 212 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
 213 #endif
 214
 215 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
 216 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
 217 #else
 218 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip)
 219 #endif
 220
 221 #define yaffs_inode_to_obj(iptr) \
 222         ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
 223 #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
 224
 225 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 226 #define yaffs_super_to_dev(sb)  ((struct yaffs_dev *)sb->s_fs_info)
 227 #else
 228 #define yaffs_super_to_dev(sb)  ((struct yaffs_dev *)sb->u.generic_sbp)
 229 #endif
 230
 231 #define update_dir_time(dir) do {\
 232                         (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
 233                 } while (0)
 234
 235 static void yaffs_put_super(struct super_block *sb);
 236
 237 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 238                                 loff_t *pos);
 239 static ssize_t yaffs_hold_space(struct file *f);
 240 static void yaffs_release_space(struct file *f);
 241
 242 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 243 static int yaffs_file_flush(struct file *file, fl_owner_t id);
 244 #else
 245 static int yaffs_file_flush(struct file *file);
 246 #endif
 247
 248 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
 249 static int yaffs_sync_object(struct file *file, loff_t start, loff_t end, int datasync);
 250 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
 251 static int yaffs_sync_object(struct file *file, int datasync);
 252 #else
 253 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 254                              int datasync);
 255 #endif
 256
 257 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
 258
 259 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 260 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 261                         struct nameidata *n);
 262 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 263                                    struct nameidata *n);
 264 #else
 265 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
 266 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
 267 #endif
 268 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 269                       struct dentry *dentry);
 270 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
 271 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 272                          const char *symname);
 273 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 274
 275 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 276 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 277                        dev_t dev);
 278 #else
 279 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 280                        int dev);
 281 #endif
 282 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 283                         struct inode *new_dir, struct dentry *new_dentry);
 284 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
 285
 286 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 287 static int yaffs_sync_fs(struct super_block *sb, int wait);
 288 static void yaffs_write_super(struct super_block *sb);
 289 #else
 290 static int yaffs_sync_fs(struct super_block *sb);
 291 static int yaffs_write_super(struct super_block *sb);
 292 #endif
 293
 294 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 295 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
 296 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 297 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
 298 #else
 299 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 300 #endif
 301
 302 #ifdef YAFFS_HAS_PUT_INODE
 303 static void yaffs_put_inode(struct inode *inode);
 304 #endif
 305
 306 #ifdef YAFFS_HAS_EVICT_INODE
 307 static void yaffs_evict_inode(struct inode *);
 308 #else
 309 static void yaffs_delete_inode(struct inode *);
 310 static void yaffs_clear_inode(struct inode *);
 311 #endif
 312
 313 static int yaffs_readpage(struct file *file, struct page *page);
 314 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 315 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 316 #else
 317 static int yaffs_writepage(struct page *page);
 318 #endif
 319
 320 static int yaffs_setxattr(struct dentry *dentry, const char *name,
 321                    const void *value, size_t size, int flags);
 322 static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name,
 323                                 void *buff, size_t size);
 324 static int yaffs_removexattr(struct dentry *dentry, const char *name);
 325 static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
 326
 327 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
 328 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 329                              loff_t pos, unsigned len, unsigned flags,
 330                              struct page **pagep, void **fsdata);
 331 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 332                            loff_t pos, unsigned len, unsigned copied,
 333                            struct page *pg, void *fsdadata);
 334 #else
 335 static int yaffs_prepare_write(struct file *f, struct page *pg,
 336                                unsigned offset, unsigned to);
 337 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 338                               unsigned to);
 339
 340 #endif
 341
 342 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 343                           int buflen);
 344 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 345 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
 346 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 347 #else
 348 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 349 #endif
 350
 351 static void yaffs_touch_super(struct yaffs_dev *dev);
 352
 353 static int yaffs_vfs_setattr(struct inode *, struct iattr *);
 354
 355 static struct address_space_operations yaffs_file_address_operations = {
 356         .readpage = yaffs_readpage,
 357         .writepage = yaffs_writepage,
 358 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
 359         .write_begin = yaffs_write_begin,
 360         .write_end = yaffs_write_end,
 361 #else
 362         .prepare_write = yaffs_prepare_write,
 363         .commit_write = yaffs_commit_write,
 364 #endif
 365 };
 366
 367 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
 368 static const struct file_operations yaffs_file_operations = {
 369         .read = do_sync_read,
 370         .write = do_sync_write,
 371         .aio_read = generic_file_aio_read,
 372         .aio_write = generic_file_aio_write,
 373         .mmap = generic_file_mmap,
 374         .flush = yaffs_file_flush,
 375         .fsync = yaffs_sync_object,
 376         .splice_read = generic_file_splice_read,
 377         .splice_write = generic_file_splice_write,
 378         .llseek = generic_file_llseek,
 379 };
 380
 381 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
 382
 383 static const struct file_operations yaffs_file_operations = {
 384         .read = do_sync_read,
 385         .write = do_sync_write,
 386         .aio_read = generic_file_aio_read,
 387         .aio_write = generic_file_aio_write,
 388         .mmap = generic_file_mmap,
 389         .flush = yaffs_file_flush,
 390         .fsync = yaffs_sync_object,
 391         .sendfile = generic_file_sendfile,
 392 };
 393
 394 #else
 395
 396 static const struct file_operations yaffs_file_operations = {
 397         .read = generic_file_read,
 398         .write = generic_file_write,
 399         .mmap = generic_file_mmap,
 400         .flush = yaffs_file_flush,
 401         .fsync = yaffs_sync_object,
 402 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 403         .sendfile = generic_file_sendfile,
 404 #endif
 405 };
 406 #endif
 407
 408 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
 409 static void zero_user_segment(struct page *page, unsigned start, unsigned end)
 410 {
 411         void *kaddr = kmap_atomic(page, KM_USER0);
 412         memset(kaddr + start, 0, end - start);
 413         kunmap_atomic(kaddr, KM_USER0);
 414         flush_dcache_page(page);
 415 }
 416 #endif
 417
 418 static const struct inode_operations yaffs_file_inode_operations = {
 419         .setattr = yaffs_setattr,
 420         .setxattr = yaffs_setxattr,
 421         .getxattr = yaffs_getxattr,
 422         .listxattr = yaffs_listxattr,
 423         .removexattr = yaffs_removexattr,
 424 };
 425
 426 static const struct inode_operations yaffs_symlink_inode_operations = {
 427         .readlink = yaffs_readlink,
 428         .follow_link = yaffs_follow_link,
 429 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 430         .put_link = yaffs_put_link,
 431 #endif
 432         .setattr = yaffs_setattr,
 433         .setxattr = yaffs_setxattr,
 434         .getxattr = yaffs_getxattr,
 435         .listxattr = yaffs_listxattr,
 436         .removexattr = yaffs_removexattr,
 437 };
 438
 439 static const struct inode_operations yaffs_dir_inode_operations = {
 440         .create = yaffs_create,
 441         .lookup = yaffs_lookup,
 442         .link = yaffs_link,
 443         .unlink = yaffs_unlink,
 444         .symlink = yaffs_symlink,
 445         .mkdir = yaffs_mkdir,
 446         .rmdir = yaffs_unlink,
 447         .mknod = yaffs_mknod,
 448         .rename = yaffs_rename,
 449         .setattr = yaffs_setattr,
 450         .setxattr = yaffs_setxattr,
 451         .getxattr = yaffs_getxattr,
 452         .listxattr = yaffs_listxattr,
 453         .removexattr = yaffs_removexattr,
 454 };
 455
 456 static const struct file_operations yaffs_dir_operations = {
 457         .read = generic_read_dir,
 458         .readdir = yaffs_readdir,
 459         .fsync = yaffs_sync_object,
 460         .llseek = generic_file_llseek,
 461 };
 462
 463 static const struct super_operations yaffs_super_ops = {
 464         .statfs = yaffs_statfs,
 465
 466 #ifndef YAFFS_USE_OWN_IGET
 467         .read_inode = yaffs_read_inode,
 468 #endif
 469 #ifdef YAFFS_HAS_PUT_INODE
 470         .put_inode = yaffs_put_inode,
 471 #endif
 472         .put_super = yaffs_put_super,
 473 #ifdef YAFFS_HAS_EVICT_INODE
 474         .evict_inode = yaffs_evict_inode,
 475 #else
 476         .delete_inode = yaffs_delete_inode,
 477         .clear_inode = yaffs_clear_inode,
 478 #endif
 479         .sync_fs = yaffs_sync_fs,
 480         .write_super = yaffs_write_super,
 481 };
 482
 483 static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
 484 {
 485 #ifdef YAFFS_USE_SETATTR_COPY
 486         setattr_copy(inode, attr);
 487         return 0;
 488 #else
 489         return inode_setattr(inode, attr);
 490 #endif
 491
 492 }
 493
 494 static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
 495 {
 496 #ifdef YAFFS_USE_TRUNCATE_SETSIZE
 497         truncate_setsize(inode, newsize);
 498         return 0;
 499 #else
 500         truncate_inode_pages(&inode->i_data, newsize);
 501         return 0;
 502 #endif
 503
 504 }
 505
 506 static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
 507 {
 508         return yaffs_gc_control;
 509 }
 510
 511 static void yaffs_gross_lock(struct yaffs_dev *dev)
 512 {
 513         yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
 514         mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
 515         yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
 516 }
 517
 518 static void yaffs_gross_unlock(struct yaffs_dev *dev)
 519 {
 520         yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
 521         mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
 522 }
 523
 524 #ifdef YAFFS_COMPILE_EXPORTFS
 525
 526 static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
 527                                           uint32_t generation)
 528 {
 529         return Y_IGET(sb, ino);
 530 }
 531
 532 static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
 533                                           struct fid *fid, int fh_len,
 534                                           int fh_type)
 535 {
 536         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 537                                     yaffs2_nfs_get_inode);
 538 }
 539
 540 static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
 541                                           struct fid *fid, int fh_len,
 542                                           int fh_type)
 543 {
 544         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 545                                     yaffs2_nfs_get_inode);
 546 }
 547
 548 struct dentry *yaffs2_get_parent(struct dentry *dentry)
 549 {
 550
 551         struct super_block *sb = dentry->d_inode->i_sb;
 552         struct dentry *parent = ERR_PTR(-ENOENT);
 553         struct inode *inode;
 554         unsigned long parent_ino;
 555         struct yaffs_obj *d_obj;
 556         struct yaffs_obj *parent_obj;
 557
 558         d_obj = yaffs_inode_to_obj(dentry->d_inode);
 559
 560         if (d_obj) {
 561                 parent_obj = d_obj->parent;
 562                 if (parent_obj) {
 563                         parent_ino = yaffs_get_obj_inode(parent_obj);
 564                         inode = Y_IGET(sb, parent_ino);
 565
 566                         if (IS_ERR(inode)) {
 567                                 parent = ERR_CAST(inode);
 568                         } else {
 569                                 parent = d_obtain_alias(inode);
 570                                 if (!IS_ERR(parent)) {
 571                                         parent = ERR_PTR(-ENOMEM);
 572                                         iput(inode);
 573                                 }
 574                         }
 575                 }
 576         }
 577
 578         return parent;
 579 }
 580
 581 /* Just declare a zero structure as a NULL value implies
 582  * using the default functions of exportfs.
 583  */
 584
 585 static struct export_operations yaffs_export_ops = {
 586         .fh_to_dentry = yaffs2_fh_to_dentry,
 587         .fh_to_parent = yaffs2_fh_to_parent,
 588         .get_parent = yaffs2_get_parent,
 589 };
 590
 591 #endif
 592
 593 /*-----------------------------------------------------------------*/
 594 /* Directory search context allows us to unlock access to yaffs during
 595  * filldir without causing problems with the directory being modified.
 596  * This is similar to the tried and tested mechanism used in yaffs direct.
 597  *
 598  * A search context iterates along a doubly linked list of siblings in the
 599  * directory. If the iterating object is deleted then this would corrupt
 600  * the list iteration, likely causing a crash. The search context avoids
 601  * this by using the remove_obj_fn to move the search context to the
 602  * next object before the object is deleted.
 603  *
 604  * Many readdirs (and thus seach conexts) may be alive simulateously so
 605  * each struct yaffs_dev has a list of these.
 606  *
 607  * A seach context lives for the duration of a readdir.
 608  *
 609  * All these functions must be called while yaffs is locked.
 610  */
 611
 612 struct yaffs_search_context {
 613         struct yaffs_dev *dev;
 614         struct yaffs_obj *dir_obj;
 615         struct yaffs_obj *next_return;
 616         struct list_head others;
 617 };
 618
 619 /*
 620  * yaffs_new_search() creates a new search context, initialises it and
 621  * adds it to the device's search context list.
 622  *
 623  * Called at start of readdir.
 624  */
 625 static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
 626 {
 627         struct yaffs_dev *dev = dir->my_dev;
 628         struct yaffs_search_context *sc =
 629             kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
 630         if (sc) {
 631                 sc->dir_obj = dir;
 632                 sc->dev = dev;
 633                 if (list_empty(&sc->dir_obj->variant.dir_variant.children))
 634                         sc->next_return = NULL;
 635                 else
 636                         sc->next_return =
 637                             list_entry(dir->variant.dir_variant.children.next,
 638                                        struct yaffs_obj, siblings);
 639                 INIT_LIST_HEAD(&sc->others);
 640                 list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
 641         }
 642         return sc;
 643 }
 644
 645 /*
 646  * yaffs_search_end() disposes of a search context and cleans up.
 647  */
 648 static void yaffs_search_end(struct yaffs_search_context *sc)
 649 {
 650         if (sc) {
 651                 list_del(&sc->others);
 652                 kfree(sc);
 653         }
 654 }
 655
 656 /*
 657  * yaffs_search_advance() moves a search context to the next object.
 658  * Called when the search iterates or when an object removal causes
 659  * the search context to be moved to the next object.
 660  */
 661 static void yaffs_search_advance(struct yaffs_search_context *sc)
 662 {
 663         if (!sc)
 664                 return;
 665
 666         if (sc->next_return == NULL ||
 667             list_empty(&sc->dir_obj->variant.dir_variant.children))
 668                 sc->next_return = NULL;
 669         else {
 670                 struct list_head *next = sc->next_return->siblings.next;
 671
 672                 if (next == &sc->dir_obj->variant.dir_variant.children)
 673                         sc->next_return = NULL; /* end of list */
 674                 else
 675                         sc->next_return =
 676                             list_entry(next, struct yaffs_obj, siblings);
 677         }
 678 }
 679
 680 /*
 681  * yaffs_remove_obj_callback() is called when an object is unlinked.
 682  * We check open search contexts and advance any which are currently
 683  * on the object being iterated.
 684  */
 685 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
 686 {
 687
 688         struct list_head *i;
 689         struct yaffs_search_context *sc;
 690         struct list_head *search_contexts =
 691             &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
 692
 693         /* Iterate through the directory search contexts.
 694          * If any are currently on the object being removed, then advance
 695          * the search context to the next object to prevent a hanging pointer.
 696          */
 697         list_for_each(i, search_contexts) {
 698                 sc = list_entry(i, struct yaffs_search_context, others);
 699                 if (sc->next_return == obj)
 700                         yaffs_search_advance(sc);
 701         }
 702
 703 }
 704
 705 /*-----------------------------------------------------------------*/
 706
 707 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
 708                           int buflen)
 709 {
 710         unsigned char *alias;
 711         int ret;
 712
 713         struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
 714
 715         yaffs_gross_lock(dev);
 716
 717         alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
 718
 719         yaffs_gross_unlock(dev);
 720
 721         if (!alias)
 722                 return -ENOMEM;
 723
 724         ret = vfs_readlink(dentry, buffer, buflen, alias);
 725         kfree(alias);
 726         return ret;
 727 }
 728
 729 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 730 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 731 {
 732         void *ret;
 733 #else
 734 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 735 {
 736         int ret
 737 #endif
 738         unsigned char *alias;
 739         int ret_int = 0;
 740         struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
 741
 742         yaffs_gross_lock(dev);
 743
 744         alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
 745         yaffs_gross_unlock(dev);
 746
 747         if (!alias) {
 748                 ret_int = -ENOMEM;
 749                 goto out;
 750         }
 751 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 752         nd_set_link(nd, alias);
 753         ret = alias;
 754 out:
 755         if (ret_int)
 756                 ret = ERR_PTR(ret_int);
 757         return ret;
 758 #else
 759         ret = vfs_follow_link(nd, alias);
 760         kfree(alias);
 761 out:
 762         if (ret_int)
 763                 ret = ret_int;
 764         return ret;
 765 #endif
 766 }
 767
 768 #if (YAFFS_NEW_FOLLOW_LINK == 1)
 769 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
 770 {
 771         kfree(alias);
 772 }
 773 #endif
 774
 775 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 776                               struct yaffs_obj *obj);
 777
 778 /*
 779  * Lookup is used to find objects in the fs
 780  */
 781 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 782
 783 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
 784                                    struct nameidata *n)
 785 #else
 786 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 787 #endif
 788 {
 789         struct yaffs_obj *obj;
 790         struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
 791
 792         struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
 793
 794         if (current != yaffs_dev_to_lc(dev)->readdir_process)
 795                 yaffs_gross_lock(dev);
 796
 797         yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup for %d:%s",
 798                 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
 799
 800         obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
 801
 802         obj = yaffs_get_equivalent_obj(obj);    /* in case it was a hardlink */
 803
 804         /* Can't hold gross lock when calling yaffs_get_inode() */
 805         if (current != yaffs_dev_to_lc(dev)->readdir_process)
 806                 yaffs_gross_unlock(dev);
 807
 808         if (obj) {
 809                 yaffs_trace(YAFFS_TRACE_OS,
 810                         "yaffs_lookup found %d", obj->obj_id);
 811
 812                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 813         } else {
 814                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
 815
 816         }
 817
 818 /* added NCB for 2.5/6 compatability - forces add even if inode is
 819  * NULL which creates dentry hash */
 820         d_add(dentry, inode);
 821
 822         return NULL;
 823 }
 824
 825 #ifdef YAFFS_HAS_PUT_INODE
 826
 827 /* For now put inode is just for debugging
 828  * Put inode is called when the inode **structure** is put.
 829  */
 830 static void yaffs_put_inode(struct inode *inode)
 831 {
 832         yaffs_trace(YAFFS_TRACE_OS,
 833                 "yaffs_put_inode: ino %d, count %d"),
 834                 (int)inode->i_ino, atomic_read(&inode->i_count);
 835
 836 }
 837 #endif
 838
 839 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
 840 {
 841         /* Clear the association between the inode and
 842          * the struct yaffs_obj.
 843          */
 844         obj->my_inode = NULL;
 845         yaffs_inode_to_obj_lv(inode) = NULL;
 846
 847         /* If the object freeing was deferred, then the real
 848          * free happens now.
 849          * This should fix the inode inconsistency problem.
 850          */
 851         yaffs_handle_defered_free(obj);
 852 }
 853
 854 #ifdef YAFFS_HAS_EVICT_INODE
 855 /* yaffs_evict_inode combines into one operation what was previously done in
 856  * yaffs_clear_inode() and yaffs_delete_inode()
 857  *
 858  */
 859 static void yaffs_evict_inode(struct inode *inode)
 860 {
 861         struct yaffs_obj *obj;
 862         struct yaffs_dev *dev;
 863         int deleteme = 0;
 864
 865         obj = yaffs_inode_to_obj(inode);
 866
 867         yaffs_trace(YAFFS_TRACE_OS,
 868                 "yaffs_evict_inode: ino %d, count %d %s",
 869                 (int)inode->i_ino, atomic_read(&inode->i_count),
 870                 obj ? "object exists" : "null object");
 871
 872         if (!inode->i_nlink && !is_bad_inode(inode))
 873                 deleteme = 1;
 874         truncate_inode_pages(&inode->i_data, 0);
 875         end_writeback(inode);
 876
 877         if (deleteme && obj) {
 878                 dev = obj->my_dev;
 879                 yaffs_gross_lock(dev);
 880                 yaffs_del_obj(obj);
 881                 yaffs_gross_unlock(dev);
 882         }
 883         if (obj) {
 884                 dev = obj->my_dev;
 885                 yaffs_gross_lock(dev);
 886                 yaffs_unstitch_obj(inode, obj);
 887                 yaffs_gross_unlock(dev);
 888         }
 889 }
 890 #else
 891
 892 /* clear is called to tell the fs to release any per-inode data it holds.
 893  * The object might still exist on disk and is just being thrown out of the cache
 894  * or else the object has actually been deleted and we're being called via
 895  * the chain
 896  *   yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
 897  */
 898
 899 static void yaffs_clear_inode(struct inode *inode)
 900 {
 901         struct yaffs_obj *obj;
 902         struct yaffs_dev *dev;
 903
 904         obj = yaffs_inode_to_obj(inode);
 905
 906         yaffs_trace(YAFFS_TRACE_OS,
 907                 "yaffs_clear_inode: ino %d, count %d %s",
 908                 (int)inode->i_ino, atomic_read(&inode->i_count),
 909                 obj ? "object exists" : "null object");
 910
 911         if (obj) {
 912                 dev = obj->my_dev;
 913                 yaffs_gross_lock(dev);
 914                 yaffs_unstitch_obj(inode, obj);
 915                 yaffs_gross_unlock(dev);
 916         }
 917
 918 }
 919
 920 /* delete is called when the link count is zero and the inode
 921  * is put (ie. nobody wants to know about it anymore, time to
 922  * delete the file).
 923  * NB Must call clear_inode()
 924  */
 925 static void yaffs_delete_inode(struct inode *inode)
 926 {
 927         struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
 928         struct yaffs_dev *dev;
 929
 930         yaffs_trace(YAFFS_TRACE_OS,
 931                 "yaffs_delete_inode: ino %d, count %d %s",
 932                 (int)inode->i_ino, atomic_read(&inode->i_count),
 933                 obj ? "object exists" : "null object");
 934
 935         if (obj) {
 936                 dev = obj->my_dev;
 937                 yaffs_gross_lock(dev);
 938                 yaffs_del_obj(obj);
 939                 yaffs_gross_unlock(dev);
 940         }
 941 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 942         truncate_inode_pages(&inode->i_data, 0);
 943 #endif
 944         clear_inode(inode);
 945 }
 946 #endif
 947
 948 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 949 static int yaffs_file_flush(struct file *file, fl_owner_t id)
 950 #else
 951 static int yaffs_file_flush(struct file *file)
 952 #endif
 953 {
 954         struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
 955
 956         struct yaffs_dev *dev = obj->my_dev;
 957
 958         yaffs_trace(YAFFS_TRACE_OS,
 959                 "yaffs_file_flush object %d (%s)",
 960                 obj->obj_id,
 961                 obj->dirty ? "dirty" : "clean");
 962
 963         yaffs_gross_lock(dev);
 964
 965         yaffs_flush_file(obj, 1, 0);
 966
 967         yaffs_gross_unlock(dev);
 968
 969         return 0;
 970 }
 971
 972 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 973 {
 974         /* Lifted from jffs2 */
 975
 976         struct yaffs_obj *obj;
 977         unsigned char *pg_buf;
 978         int ret;
 979
 980         struct yaffs_dev *dev;
 981
 982         yaffs_trace(YAFFS_TRACE_OS,
 983                 "yaffs_readpage_nolock at %08x, size %08x",
 984                 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
 985                 (unsigned)PAGE_CACHE_SIZE);
 986
 987         obj = yaffs_dentry_to_obj(f->f_dentry);
 988
 989         dev = obj->my_dev;
 990
 991 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 992         BUG_ON(!PageLocked(pg));
 993 #else
 994         if (!PageLocked(pg))
 995                 PAGE_BUG(pg);
 996 #endif
 997
 998         pg_buf = kmap(pg);
 999         /* FIXME: Can kmap fail? */
1000
1001         yaffs_gross_lock(dev);
1002
1003         ret = yaffs_file_rd(obj, pg_buf,
1004                             pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
1005
1006         yaffs_gross_unlock(dev);
1007
1008         if (ret >= 0)
1009                 ret = 0;
1010
1011         if (ret) {
1012                 ClearPageUptodate(pg);
1013                 SetPageError(pg);
1014         } else {
1015                 SetPageUptodate(pg);
1016                 ClearPageError(pg);
1017         }
1018
1019         flush_dcache_page(pg);
1020         kunmap(pg);
1021
1022         yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
1023         return ret;
1024 }
1025
1026 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
1027 {
1028         int ret = yaffs_readpage_nolock(f, pg);
1029         UnlockPage(pg);
1030         return ret;
1031 }
1032
1033 static int yaffs_readpage(struct file *f, struct page *pg)
1034 {
1035         int ret;
1036
1037         yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
1038         ret = yaffs_readpage_unlock(f, pg);
1039         yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
1040         return ret;
1041 }
1042
1043 /* writepage inspired by/stolen from smbfs */
1044
1045 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1046 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
1047 #else
1048 static int yaffs_writepage(struct page *page)
1049 #endif
1050 {
1051         struct yaffs_dev *dev;
1052         struct address_space *mapping = page->mapping;
1053         struct inode *inode;
1054         unsigned long end_index;
1055         char *buffer;
1056         struct yaffs_obj *obj;
1057         int n_written = 0;
1058         unsigned n_bytes;
1059         loff_t i_size;
1060
1061         if (!mapping)
1062                 BUG();
1063         inode = mapping->host;
1064         if (!inode)
1065                 BUG();
1066         i_size = i_size_read(inode);
1067
1068         end_index = i_size >> PAGE_CACHE_SHIFT;
1069
1070         if (page->index < end_index)
1071                 n_bytes = PAGE_CACHE_SIZE;
1072         else {
1073                 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
1074
1075                 if (page->index > end_index || !n_bytes) {
1076                         yaffs_trace(YAFFS_TRACE_OS,
1077                                 "yaffs_writepage at %08x, inode size = %08x!!",
1078                                 (unsigned)(page->index << PAGE_CACHE_SHIFT),
1079                                 (unsigned)inode->i_size);
1080                         yaffs_trace(YAFFS_TRACE_OS,
1081                                 "                -> don't care!!");
1082
1083                         zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1084                         set_page_writeback(page);
1085                         unlock_page(page);
1086                         end_page_writeback(page);
1087                         return 0;
1088                 }
1089         }
1090
1091         if (n_bytes != PAGE_CACHE_SIZE)
1092                 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
1093
1094         get_page(page);
1095
1096         buffer = kmap(page);
1097
1098         obj = yaffs_inode_to_obj(inode);
1099         dev = obj->my_dev;
1100         yaffs_gross_lock(dev);
1101
1102         yaffs_trace(YAFFS_TRACE_OS,
1103                 "yaffs_writepage at %08x, size %08x",
1104                 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes);
1105         yaffs_trace(YAFFS_TRACE_OS,
1106                 "writepag0: obj = %05x, ino = %05x",
1107                 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1108
1109         n_written = yaffs_wr_file(obj, buffer,
1110                                   page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
1111
1112         yaffs_touch_super(dev);
1113
1114         yaffs_trace(YAFFS_TRACE_OS,
1115                 "writepag1: obj = %05x, ino = %05x",
1116                 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1117
1118         yaffs_gross_unlock(dev);
1119
1120         kunmap(page);
1121         set_page_writeback(page);
1122         unlock_page(page);
1123         end_page_writeback(page);
1124         put_page(page);
1125
1126         return (n_written == n_bytes) ? 0 : -ENOSPC;
1127 }
1128
1129 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1130 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
1131                              loff_t pos, unsigned len, unsigned flags,
1132                              struct page **pagep, void **fsdata)
1133 {
1134         struct page *pg = NULL;
1135         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1136
1137         int ret = 0;
1138         int space_held = 0;
1139
1140         /* Get a page */
1141 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
1142         pg = grab_cache_page_write_begin(mapping, index, flags);
1143 #else
1144         pg = __grab_cache_page(mapping, index);
1145 #endif
1146
1147         *pagep = pg;
1148         if (!pg) {
1149                 ret = -ENOMEM;
1150                 goto out;
1151         }
1152         yaffs_trace(YAFFS_TRACE_OS,
1153                 "start yaffs_write_begin index %d(%x) uptodate %d",
1154                 (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0);
1155
1156         /* Get fs space */
1157         space_held = yaffs_hold_space(filp);
1158
1159         if (!space_held) {
1160                 ret = -ENOSPC;
1161                 goto out;
1162         }
1163
1164         /* Update page if required */
1165
1166         if (!Page_Uptodate(pg))
1167                 ret = yaffs_readpage_nolock(filp, pg);
1168
1169         if (ret)
1170                 goto out;
1171
1172         /* Happy path return */
1173         yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
1174
1175         return 0;
1176
1177 out:
1178         yaffs_trace(YAFFS_TRACE_OS,
1179                 "end yaffs_write_begin fail returning %d", ret);
1180         if (space_held)
1181                 yaffs_release_space(filp);
1182         if (pg) {
1183                 unlock_page(pg);
1184                 page_cache_release(pg);
1185         }
1186         return ret;
1187 }
1188
1189 #else
1190
1191 static int yaffs_prepare_write(struct file *f, struct page *pg,
1192                                unsigned offset, unsigned to)
1193 {
1194         yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write");
1195
1196         if (!Page_Uptodate(pg))
1197                 return yaffs_readpage_nolock(f, pg);
1198         return 0;
1199 }
1200 #endif
1201
1202 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1203 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1204                            loff_t pos, unsigned len, unsigned copied,
1205                            struct page *pg, void *fsdadata)
1206 {
1207         int ret = 0;
1208         void *addr, *kva;
1209         uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1210
1211         kva = kmap(pg);
1212         addr = kva + offset_into_page;
1213
1214         yaffs_trace(YAFFS_TRACE_OS,
1215                 "yaffs_write_end addr %p pos %x n_bytes %d",
1216                 addr, (unsigned)pos, copied);
1217
1218         ret = yaffs_file_write(filp, addr, copied, &pos);
1219
1220         if (ret != copied) {
1221                 yaffs_trace(YAFFS_TRACE_OS,
1222                         "yaffs_write_end not same size ret %d  copied %d",
1223                         ret, copied);
1224                 SetPageError(pg);
1225         }
1226
1227         kunmap(pg);
1228
1229         yaffs_release_space(filp);
1230         unlock_page(pg);
1231         page_cache_release(pg);
1232         return ret;
1233 }
1234 #else
1235
1236 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
1237                               unsigned to)
1238 {
1239         void *addr, *kva;
1240
1241         loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
1242         int n_bytes = to - offset;
1243         int n_written;
1244
1245         unsigned spos = pos;
1246         unsigned saddr;
1247
1248         kva = kmap(pg);
1249         addr = kva + offset;
1250
1251         saddr = (unsigned)addr;
1252
1253         yaffs_trace(YAFFS_TRACE_OS,
1254                 "yaffs_commit_write addr %x pos %x n_bytes %d",
1255                 saddr, spos, n_bytes);
1256
1257         n_written = yaffs_file_write(f, addr, n_bytes, &pos);
1258
1259         if (n_written != n_bytes) {
1260                 yaffs_trace(YAFFS_TRACE_OS,
1261                         "yaffs_commit_write not same size n_written %d  n_bytes %d",
1262                         n_written, n_bytes);
1263                 SetPageError(pg);
1264         }
1265         kunmap(pg);
1266
1267         yaffs_trace(YAFFS_TRACE_OS,
1268                 "yaffs_commit_write returning %d",
1269                 n_written == n_bytes ? 0 : n_written);
1270
1271         return n_written == n_bytes ? 0 : n_written;
1272 }
1273 #endif
1274
1275 static void yaffs_fill_inode_from_obj(struct inode *inode,
1276                                       struct yaffs_obj *obj)
1277 {
1278         if (inode && obj) {
1279
1280                 /* Check mode against the variant type and attempt to repair if broken. */
1281                 u32 mode = obj->yst_mode;
1282                 switch (obj->variant_type) {
1283                 case YAFFS_OBJECT_TYPE_FILE:
1284                         if (!S_ISREG(mode)) {
1285                                 obj->yst_mode &= ~S_IFMT;
1286                                 obj->yst_mode |= S_IFREG;
1287                         }
1288
1289                         break;
1290                 case YAFFS_OBJECT_TYPE_SYMLINK:
1291                         if (!S_ISLNK(mode)) {
1292                                 obj->yst_mode &= ~S_IFMT;
1293                                 obj->yst_mode |= S_IFLNK;
1294                         }
1295
1296                         break;
1297                 case YAFFS_OBJECT_TYPE_DIRECTORY:
1298                         if (!S_ISDIR(mode)) {
1299                                 obj->yst_mode &= ~S_IFMT;
1300                                 obj->yst_mode |= S_IFDIR;
1301                         }
1302
1303                         break;
1304                 case YAFFS_OBJECT_TYPE_UNKNOWN:
1305                 case YAFFS_OBJECT_TYPE_HARDLINK:
1306                 case YAFFS_OBJECT_TYPE_SPECIAL:
1307                 default:
1308                         /* TODO? */
1309                         break;
1310                 }
1311
1312                 inode->i_flags |= S_NOATIME;
1313
1314                 inode->i_ino = obj->obj_id;
1315                 inode->i_mode = obj->yst_mode;
1316                 inode->i_uid = obj->yst_uid;
1317                 inode->i_gid = obj->yst_gid;
1318 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
1319                 inode->i_blksize = inode->i_sb->s_blocksize;
1320 #endif
1321 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1322
1323                 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1324                 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1325                 inode->i_atime.tv_nsec = 0;
1326                 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1327                 inode->i_mtime.tv_nsec = 0;
1328                 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1329                 inode->i_ctime.tv_nsec = 0;
1330 #else
1331                 inode->i_rdev = obj->yst_rdev;
1332                 inode->i_atime = obj->yst_atime;
1333                 inode->i_mtime = obj->yst_mtime;
1334                 inode->i_ctime = obj->yst_ctime;
1335 #endif
1336                 inode->i_size = yaffs_get_obj_length(obj);
1337                 inode->i_blocks = (inode->i_size + 511) >> 9;
1338
1339                 set_nlink(inode, yaffs_get_obj_link_count(obj));
1340
1341                 yaffs_trace(YAFFS_TRACE_OS,
1342                         "yaffs_fill_inode mode %x uid %d gid %d size %d count %d",
1343                         inode->i_mode, inode->i_uid, inode->i_gid,
1344                         (int)inode->i_size, atomic_read(&inode->i_count));
1345
1346                 switch (obj->yst_mode & S_IFMT) {
1347                 default:        /* fifo, device or socket */
1348 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1349                         init_special_inode(inode, obj->yst_mode,
1350                                            old_decode_dev(obj->yst_rdev));
1351 #else
1352                         init_special_inode(inode, obj->yst_mode,
1353                                            (dev_t) (obj->yst_rdev));
1354 #endif
1355                         break;
1356                 case S_IFREG:   /* file */
1357                         inode->i_op = &yaffs_file_inode_operations;
1358                         inode->i_fop = &yaffs_file_operations;
1359                         inode->i_mapping->a_ops =
1360                             &yaffs_file_address_operations;
1361                         break;
1362                 case S_IFDIR:   /* directory */
1363                         inode->i_op = &yaffs_dir_inode_operations;
1364                         inode->i_fop = &yaffs_dir_operations;
1365                         break;
1366                 case S_IFLNK:   /* symlink */
1367                         inode->i_op = &yaffs_symlink_inode_operations;
1368                         break;
1369                 }
1370
1371                 yaffs_inode_to_obj_lv(inode) = obj;
1372
1373                 obj->my_inode = inode;
1374
1375         } else {
1376                 yaffs_trace(YAFFS_TRACE_OS,
1377                         "yaffs_fill_inode invalid parameters");
1378         }
1379
1380 }
1381
1382 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1383                               struct yaffs_obj *obj)
1384 {
1385         struct inode *inode;
1386
1387         if (!sb) {
1388                 yaffs_trace(YAFFS_TRACE_OS,
1389                         "yaffs_get_inode for NULL super_block!!");
1390                 return NULL;
1391
1392         }
1393
1394         if (!obj) {
1395                 yaffs_trace(YAFFS_TRACE_OS,
1396                         "yaffs_get_inode for NULL object!!");
1397                 return NULL;
1398
1399         }
1400
1401         yaffs_trace(YAFFS_TRACE_OS,
1402                 "yaffs_get_inode for object %d", obj->obj_id);
1403
1404         inode = Y_IGET(sb, obj->obj_id);
1405         if (IS_ERR(inode))
1406                 return NULL;
1407
1408         /* NB Side effect: iget calls back to yaffs_read_inode(). */
1409         /* iget also increments the inode's i_count */
1410         /* NB You can't be holding gross_lock or deadlock will happen! */
1411
1412         return inode;
1413 }
1414
1415 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1416                                 loff_t * pos)
1417 {
1418         struct yaffs_obj *obj;
1419         int n_written, ipos;
1420         struct inode *inode;
1421         struct yaffs_dev *dev;
1422
1423         obj = yaffs_dentry_to_obj(f->f_dentry);
1424
1425         if (!obj) {
1426                 yaffs_trace(YAFFS_TRACE_OS,
1427                         "yaffs_file_write: hey obj is null!");
1428                 return -EINVAL;
1429         }
1430
1431         dev = obj->my_dev;
1432
1433         yaffs_gross_lock(dev);
1434
1435         inode = f->f_dentry->d_inode;
1436
1437         if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1438                 ipos = inode->i_size;
1439         else
1440                 ipos = *pos;
1441
1442         yaffs_trace(YAFFS_TRACE_OS,
1443                 "yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)",
1444                 (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos);
1445
1446         n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
1447
1448         yaffs_touch_super(dev);
1449
1450         yaffs_trace(YAFFS_TRACE_OS,
1451                 "yaffs_file_write: %d(%x) bytes written",
1452                 (unsigned)n, (unsigned)n);
1453
1454         if (n_written > 0) {
1455                 ipos += n_written;
1456                 *pos = ipos;
1457                 if (ipos > inode->i_size) {
1458                         inode->i_size = ipos;
1459                         inode->i_blocks = (ipos + 511) >> 9;
1460
1461                         yaffs_trace(YAFFS_TRACE_OS,
1462                                 "yaffs_file_write size updated to %d bytes, %d blocks",
1463                                 ipos, (int)(inode->i_blocks));
1464                 }
1465
1466         }
1467         yaffs_gross_unlock(dev);
1468         return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
1469 }
1470
1471 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1472 /* For now we just assume few parallel writes and check against a small number. */
1473 /* Todo: need to do this with a counter to handle parallel reads better */
1474
1475 static ssize_t yaffs_hold_space(struct file *f)
1476 {
1477         struct yaffs_obj *obj;
1478         struct yaffs_dev *dev;
1479
1480         int n_free_chunks;
1481
1482         obj = yaffs_dentry_to_obj(f->f_dentry);
1483
1484         dev = obj->my_dev;
1485
1486         yaffs_gross_lock(dev);
1487
1488         n_free_chunks = yaffs_get_n_free_chunks(dev);
1489
1490         yaffs_gross_unlock(dev);
1491
1492         return (n_free_chunks > 20) ? 1 : 0;
1493 }
1494
1495 static void yaffs_release_space(struct file *f)
1496 {
1497         struct yaffs_obj *obj;
1498         struct yaffs_dev *dev;
1499
1500         obj = yaffs_dentry_to_obj(f->f_dentry);
1501
1502         dev = obj->my_dev;
1503
1504         yaffs_gross_lock(dev);
1505
1506         yaffs_gross_unlock(dev);
1507 }
1508
1509 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1510 {
1511         struct yaffs_obj *obj;
1512         struct yaffs_dev *dev;
1513         struct yaffs_search_context *sc;
1514         struct inode *inode = f->f_dentry->d_inode;
1515         unsigned long offset, curoffs;
1516         struct yaffs_obj *l;
1517         int ret_val = 0;
1518
1519         char name[YAFFS_MAX_NAME_LENGTH + 1];
1520
1521         obj = yaffs_dentry_to_obj(f->f_dentry);
1522         dev = obj->my_dev;
1523
1524         yaffs_gross_lock(dev);
1525
1526         yaffs_dev_to_lc(dev)->readdir_process = current;
1527
1528         offset = f->f_pos;
1529
1530         sc = yaffs_new_search(obj);
1531         if (!sc) {
1532                 ret_val = -ENOMEM;
1533                 goto out;
1534         }
1535
1536         yaffs_trace(YAFFS_TRACE_OS,
1537                 "yaffs_readdir: starting at %d", (int)offset);
1538
1539         if (offset == 0) {
1540                 yaffs_trace(YAFFS_TRACE_OS,
1541                         "yaffs_readdir: entry . ino %d",
1542                         (int)inode->i_ino);
1543                 yaffs_gross_unlock(dev);
1544                 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
1545                         yaffs_gross_lock(dev);
1546                         goto out;
1547                 }
1548                 yaffs_gross_lock(dev);
1549                 offset++;
1550                 f->f_pos++;
1551         }
1552         if (offset == 1) {
1553                 yaffs_trace(YAFFS_TRACE_OS,
1554                         "yaffs_readdir: entry .. ino %d",
1555                         (int)f->f_dentry->d_parent->d_inode->i_ino);
1556                 yaffs_gross_unlock(dev);
1557                 if (filldir(dirent, "..", 2, offset,
1558                             f->f_dentry->d_parent->d_inode->i_ino,
1559                             DT_DIR) < 0) {
1560                         yaffs_gross_lock(dev);
1561                         goto out;
1562                 }
1563                 yaffs_gross_lock(dev);
1564                 offset++;
1565                 f->f_pos++;
1566         }
1567
1568         curoffs = 1;
1569
1570         /* If the directory has changed since the open or last call to
1571            readdir, rewind to after the 2 canned entries. */
1572         if (f->f_version != inode->i_version) {
1573                 offset = 2;
1574                 f->f_pos = offset;
1575                 f->f_version = inode->i_version;
1576         }
1577
1578         while (sc->next_return) {
1579                 curoffs++;
1580                 l = sc->next_return;
1581                 if (curoffs >= offset) {
1582                         int this_inode = yaffs_get_obj_inode(l);
1583                         int this_type = yaffs_get_obj_type(l);
1584
1585                         yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
1586                         yaffs_trace(YAFFS_TRACE_OS,
1587                                 "yaffs_readdir: %s inode %d",
1588                                 name, yaffs_get_obj_inode(l));
1589
1590                         yaffs_gross_unlock(dev);
1591
1592                         if (filldir(dirent,
1593                                     name,
1594                                     strlen(name),
1595                                     offset, this_inode, this_type) < 0) {
1596                                 yaffs_gross_lock(dev);
1597                                 goto out;
1598                         }
1599
1600                         yaffs_gross_lock(dev);
1601
1602                         offset++;
1603                         f->f_pos++;
1604                 }
1605                 yaffs_search_advance(sc);
1606         }
1607
1608 out:
1609         yaffs_search_end(sc);
1610         yaffs_dev_to_lc(dev)->readdir_process = NULL;
1611         yaffs_gross_unlock(dev);
1612
1613         return ret_val;
1614 }
1615
1616 /*
1617  * File creation. Allocate an inode, and we're done..
1618  */
1619
1620 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1621 #define YCRED(x) x
1622 #else
1623 #define YCRED(x) (x->cred)
1624 #endif
1625
1626 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1627 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1628                        dev_t rdev)
1629 #else
1630 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1631                        int rdev)
1632 #endif
1633 {
1634         struct inode *inode;
1635
1636         struct yaffs_obj *obj = NULL;
1637         struct yaffs_dev *dev;
1638
1639         struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
1640
1641         int error = -ENOSPC;
1642         uid_t uid = YCRED(current)->fsuid;
1643         gid_t gid =
1644             (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1645
1646         if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1647                 mode |= S_ISGID;
1648
1649         if (parent) {
1650                 yaffs_trace(YAFFS_TRACE_OS,
1651                         "yaffs_mknod: parent object %d type %d",
1652                         parent->obj_id, parent->variant_type);
1653         } else {
1654                 yaffs_trace(YAFFS_TRACE_OS,
1655                         "yaffs_mknod: could not get parent object");
1656                 return -EPERM;
1657         }
1658
1659         yaffs_trace(YAFFS_TRACE_OS,
1660                 "yaffs_mknod: making oject for %s, mode %x dev %x",
1661                 dentry->d_name.name, mode, rdev);
1662
1663         dev = parent->my_dev;
1664
1665         yaffs_gross_lock(dev);
1666
1667         switch (mode & S_IFMT) {
1668         default:
1669                 /* Special (socket, fifo, device...) */
1670                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
1671 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1672                 obj =
1673                     yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1674                                          gid, old_encode_dev(rdev));
1675 #else
1676                 obj =
1677                     yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1678                                          gid, rdev);
1679 #endif
1680                 break;
1681         case S_IFREG:           /* file          */
1682                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
1683                 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
1684                                         gid);
1685                 break;
1686         case S_IFDIR:           /* directory */
1687                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
1688                 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
1689                                        uid, gid);
1690                 break;
1691         case S_IFLNK:           /* symlink */
1692                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
1693                 obj = NULL;     /* Do we ever get here? */
1694                 break;
1695         }
1696
1697         /* Can not call yaffs_get_inode() with gross lock held */
1698         yaffs_gross_unlock(dev);
1699
1700         if (obj) {
1701                 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1702                 d_instantiate(dentry, inode);
1703                 update_dir_time(dir);
1704                 yaffs_trace(YAFFS_TRACE_OS,
1705                         "yaffs_mknod created object %d count = %d",
1706                         obj->obj_id, atomic_read(&inode->i_count));
1707                 error = 0;
1708                 yaffs_fill_inode_from_obj(dir, parent);
1709         } else {
1710                 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
1711                 error = -ENOMEM;
1712         }
1713
1714         return error;
1715 }
1716
1717 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1718 {
1719         int ret_val;
1720         yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir");
1721         ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1722         return ret_val;
1723 }
1724
1725 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1726 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1727                         struct nameidata *n)
1728 #else
1729 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1730 #endif
1731 {
1732         yaffs_trace(YAFFS_TRACE_OS, "yaffs_create");
1733         return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1734 }
1735
1736 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1737 {
1738         int ret_val;
1739
1740         struct yaffs_dev *dev;
1741         struct yaffs_obj *obj;
1742
1743         yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s",
1744                 (int)(dir->i_ino), dentry->d_name.name);
1745         obj = yaffs_inode_to_obj(dir);
1746         dev = obj->my_dev;
1747
1748         yaffs_gross_lock(dev);
1749
1750         ret_val = yaffs_unlinker(obj, dentry->d_name.name);
1751
1752         if (ret_val == YAFFS_OK) {
1753                 inode_dec_link_count(dentry->d_inode);
1754                 dir->i_version++;
1755                 yaffs_gross_unlock(dev);
1756                 update_dir_time(dir);
1757                 return 0;
1758         }
1759         yaffs_gross_unlock(dev);
1760         return -ENOTEMPTY;
1761 }
1762
1763 /*
1764  * Create a link...
1765  */
1766 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1767                       struct dentry *dentry)
1768 {
1769         struct inode *inode = old_dentry->d_inode;
1770         struct yaffs_obj *obj = NULL;
1771         struct yaffs_obj *link = NULL;
1772         struct yaffs_dev *dev;
1773
1774         yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
1775
1776         obj = yaffs_inode_to_obj(inode);
1777         dev = obj->my_dev;
1778
1779         yaffs_gross_lock(dev);
1780
1781         if (!S_ISDIR(inode->i_mode))    /* Don't link directories */
1782                 link =
1783                     yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
1784                                    obj);
1785
1786         if (link) {
1787                 set_nlink(old_dentry->d_inode, yaffs_get_obj_link_count(obj));
1788                 d_instantiate(dentry, old_dentry->d_inode);
1789                 atomic_inc(&old_dentry->d_inode->i_count);
1790                 yaffs_trace(YAFFS_TRACE_OS,
1791                         "yaffs_link link count %d i_count %d",
1792                         old_dentry->d_inode->i_nlink,
1793                         atomic_read(&old_dentry->d_inode->i_count));
1794         }
1795
1796         yaffs_gross_unlock(dev);
1797
1798         if (link) {
1799                 update_dir_time(dir);
1800                 return 0;
1801         }
1802
1803         return -EPERM;
1804 }
1805
1806 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1807                          const char *symname)
1808 {
1809         struct yaffs_obj *obj;
1810         struct yaffs_dev *dev;
1811         uid_t uid = YCRED(current)->fsuid;
1812         gid_t gid =
1813             (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1814
1815         yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
1816
1817         if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) >
1818                                 YAFFS_MAX_NAME_LENGTH)
1819                 return -ENAMETOOLONG;
1820
1821         if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) >
1822                                 YAFFS_MAX_ALIAS_LENGTH)
1823                 return -ENAMETOOLONG;
1824
1825         dev = yaffs_inode_to_obj(dir)->my_dev;
1826         yaffs_gross_lock(dev);
1827         obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
1828                                    S_IFLNK | S_IRWXUGO, uid, gid, symname);
1829         yaffs_gross_unlock(dev);
1830
1831         if (obj) {
1832                 struct inode *inode;
1833
1834                 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1835                 d_instantiate(dentry, inode);
1836                 update_dir_time(dir);
1837                 yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
1838                 return 0;
1839         } else {
1840                 yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
1841         }
1842
1843         return -ENOMEM;
1844 }
1845
1846 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
1847 static int yaffs_sync_object(struct file *file, loff_t start, loff_t end, int datasync)
1848 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1849 static int yaffs_sync_object(struct file *file, int datasync)
1850 #else
1851 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1852                              int datasync)
1853 #endif
1854 {
1855
1856         struct yaffs_obj *obj;
1857         struct yaffs_dev *dev;
1858 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1859         struct dentry *dentry = file->f_path.dentry;
1860 #endif
1861
1862         obj = yaffs_dentry_to_obj(dentry);
1863
1864         dev = obj->my_dev;
1865
1866         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1867                 "yaffs_sync_object");
1868         yaffs_gross_lock(dev);
1869         yaffs_flush_file(obj, 1, datasync);
1870         yaffs_gross_unlock(dev);
1871         return 0;
1872 }
1873
1874 /*
1875  * The VFS layer already does all the dentry stuff for rename.
1876  *
1877  * NB: POSIX says you can rename an object over an old object of the same name
1878  */
1879 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1880                         struct inode *new_dir, struct dentry *new_dentry)
1881 {
1882         struct yaffs_dev *dev;
1883         int ret_val = YAFFS_FAIL;
1884         struct yaffs_obj *target;
1885
1886         yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
1887         dev = yaffs_inode_to_obj(old_dir)->my_dev;
1888
1889         yaffs_gross_lock(dev);
1890
1891         /* Check if the target is an existing directory that is not empty. */
1892         target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
1893                                     new_dentry->d_name.name);
1894
1895         if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1896             !list_empty(&target->variant.dir_variant.children)) {
1897
1898                 yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
1899
1900                 ret_val = YAFFS_FAIL;
1901         } else {
1902                 /* Now does unlinking internally using shadowing mechanism */
1903                 yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
1904
1905                 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
1906                                            old_dentry->d_name.name,
1907                                            yaffs_inode_to_obj(new_dir),
1908                                            new_dentry->d_name.name);
1909         }
1910         yaffs_gross_unlock(dev);
1911
1912         if (ret_val == YAFFS_OK) {
1913                 if (target)
1914                         inode_dec_link_count(new_dentry->d_inode);
1915
1916                 update_dir_time(old_dir);
1917                 if (old_dir != new_dir)
1918                         update_dir_time(new_dir);
1919                 return 0;
1920         } else {
1921                 return -ENOTEMPTY;
1922         }
1923 }
1924
1925 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1926 {
1927         struct inode *inode = dentry->d_inode;
1928         int error = 0;
1929         struct yaffs_dev *dev;
1930
1931         yaffs_trace(YAFFS_TRACE_OS,
1932                 "yaffs_setattr of object %d",
1933                 yaffs_inode_to_obj(inode)->obj_id);
1934
1935         /* Fail if a requested resize >= 2GB */
1936         if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
1937                 error = -EINVAL;
1938
1939         if (error == 0)
1940                 error = inode_change_ok(inode, attr);
1941         if (error == 0) {
1942                 int result;
1943                 if (!error) {
1944                         error = yaffs_vfs_setattr(inode, attr);
1945                         yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
1946                         if (attr->ia_valid & ATTR_SIZE) {
1947                                 yaffs_vfs_setsize(inode, attr->ia_size);
1948                                 inode->i_blocks = (inode->i_size + 511) >> 9;
1949                         }
1950                 }
1951                 dev = yaffs_inode_to_obj(inode)->my_dev;
1952                 if (attr->ia_valid & ATTR_SIZE) {
1953                         yaffs_trace(YAFFS_TRACE_OS,
1954                                 "resize to %d(%x)",
1955                                 (int)(attr->ia_size),
1956                                 (int)(attr->ia_size));
1957                 }
1958                 yaffs_gross_lock(dev);
1959                 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
1960                 if (result == YAFFS_OK) {
1961                         error = 0;
1962                 } else {
1963                         error = -EPERM;
1964                 }
1965                 yaffs_gross_unlock(dev);
1966
1967         }
1968
1969         yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
1970
1971         return error;
1972 }
1973
1974 static int yaffs_setxattr(struct dentry *dentry, const char *name,
1975                    const void *value, size_t size, int flags)
1976 {
1977         struct inode *inode = dentry->d_inode;
1978         int error = 0;
1979         struct yaffs_dev *dev;
1980         struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1981
1982         yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
1983
1984         if (error == 0) {
1985                 int result;
1986                 dev = obj->my_dev;
1987                 yaffs_gross_lock(dev);
1988                 result = yaffs_set_xattrib(obj, name, value, size, flags);
1989                 if (result == YAFFS_OK)
1990                         error = 0;
1991                 else if (result < 0)
1992                         error = result;
1993                 yaffs_gross_unlock(dev);
1994
1995         }
1996         yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
1997
1998         return error;
1999 }
2000
2001 static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name,
2002                         void *buff, size_t size)
2003 {
2004         struct inode *inode = dentry->d_inode;
2005         int error = 0;
2006         struct yaffs_dev *dev;
2007         struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2008
2009         yaffs_trace(YAFFS_TRACE_OS,
2010                 "yaffs_getxattr \"%s\" from object %d",
2011                 name, obj->obj_id);
2012
2013         if (error == 0) {
2014                 dev = obj->my_dev;
2015                 yaffs_gross_lock(dev);
2016                 error = yaffs_get_xattrib(obj, name, buff, size);
2017                 yaffs_gross_unlock(dev);
2018
2019         }
2020         yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
2021
2022         return error;
2023 }
2024
2025 static int yaffs_removexattr(struct dentry *dentry, const char *name)
2026 {
2027         struct inode *inode = dentry->d_inode;
2028         int error = 0;
2029         struct yaffs_dev *dev;
2030         struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2031
2032         yaffs_trace(YAFFS_TRACE_OS,
2033                 "yaffs_removexattr of object %d", obj->obj_id);
2034
2035         if (error == 0) {
2036                 int result;
2037                 dev = obj->my_dev;
2038                 yaffs_gross_lock(dev);
2039                 result = yaffs_remove_xattrib(obj, name);
2040                 if (result == YAFFS_OK)
2041                         error = 0;
2042                 else if (result < 0)
2043                         error = result;
2044                 yaffs_gross_unlock(dev);
2045
2046         }
2047         yaffs_trace(YAFFS_TRACE_OS,
2048                 "yaffs_removexattr done returning %d", error);
2049
2050         return error;
2051 }
2052
2053 static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
2054 {
2055         struct inode *inode = dentry->d_inode;
2056         int error = 0;
2057         struct yaffs_dev *dev;
2058         struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2059
2060         yaffs_trace(YAFFS_TRACE_OS,
2061                 "yaffs_listxattr of object %d", obj->obj_id);
2062
2063         if (error == 0) {
2064                 dev = obj->my_dev;
2065                 yaffs_gross_lock(dev);
2066                 error = yaffs_list_xattrib(obj, buff, size);
2067                 yaffs_gross_unlock(dev);
2068
2069         }
2070         yaffs_trace(YAFFS_TRACE_OS,
2071                 "yaffs_listxattr done returning %d", error);
2072
2073         return error;
2074 }
2075
2076
2077 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2078 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
2079 {
2080         struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
2081         struct super_block *sb = dentry->d_sb;
2082 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2083 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
2084 {
2085         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2086 #else
2087 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
2088 {
2089         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2090 #endif
2091
2092         yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
2093
2094         yaffs_gross_lock(dev);
2095
2096         buf->f_type = YAFFS_MAGIC;
2097         buf->f_bsize = sb->s_blocksize;
2098         buf->f_namelen = 255;
2099
2100         if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
2101                 /* Do this if chunk size is not a power of 2 */
2102
2103                 uint64_t bytes_in_dev;
2104                 uint64_t bytes_free;
2105
2106                 bytes_in_dev =
2107                     ((uint64_t)
2108                      ((dev->param.end_block - dev->param.start_block +
2109                        1))) * ((uint64_t) (dev->param.chunks_per_block *
2110                                            dev->data_bytes_per_chunk));
2111
2112                 do_div(bytes_in_dev, sb->s_blocksize);  /* bytes_in_dev becomes the number of blocks */
2113                 buf->f_blocks = bytes_in_dev;
2114
2115                 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
2116                     ((uint64_t) (dev->data_bytes_per_chunk));
2117
2118                 do_div(bytes_free, sb->s_blocksize);
2119
2120                 buf->f_bfree = bytes_free;
2121
2122         } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
2123
2124                 buf->f_blocks =
2125                     (dev->param.end_block - dev->param.start_block + 1) *
2126                     dev->param.chunks_per_block /
2127                     (sb->s_blocksize / dev->data_bytes_per_chunk);
2128                 buf->f_bfree =
2129                     yaffs_get_n_free_chunks(dev) /
2130                     (sb->s_blocksize / dev->data_bytes_per_chunk);
2131         } else {
2132                 buf->f_blocks =
2133                     (dev->param.end_block - dev->param.start_block + 1) *
2134                     dev->param.chunks_per_block *
2135                     (dev->data_bytes_per_chunk / sb->s_blocksize);
2136
2137                 buf->f_bfree =
2138                     yaffs_get_n_free_chunks(dev) *
2139                     (dev->data_bytes_per_chunk / sb->s_blocksize);
2140         }
2141
2142         buf->f_files = 0;
2143         buf->f_ffree = 0;
2144         buf->f_bavail = buf->f_bfree;
2145
2146         yaffs_gross_unlock(dev);
2147         return 0;
2148 }
2149
2150 static void yaffs_flush_inodes(struct super_block *sb)
2151 {
2152         struct inode *iptr;
2153         struct yaffs_obj *obj;
2154
2155         list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
2156                 obj = yaffs_inode_to_obj(iptr);
2157                 if (obj) {
2158                         yaffs_trace(YAFFS_TRACE_OS,
2159                                 "flushing obj %d",
2160                                 obj->obj_id);
2161                         yaffs_flush_file(obj, 1, 0);
2162                 }
2163         }
2164 }
2165
2166 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
2167 {
2168         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2169         if (!dev)
2170                 return;
2171
2172         yaffs_flush_inodes(sb);
2173         yaffs_update_dirty_dirs(dev);
2174         yaffs_flush_whole_cache(dev);
2175         if (do_checkpoint)
2176                 yaffs_checkpoint_save(dev);
2177 }
2178
2179 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
2180 {
2181         unsigned erased_chunks =
2182             dev->n_erased_blocks * dev->param.chunks_per_block;
2183         struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2184         unsigned scattered = 0; /* Free chunks not in an erased block */
2185
2186         if (erased_chunks < dev->n_free_chunks)
2187                 scattered = (dev->n_free_chunks - erased_chunks);
2188
2189         if (!context->bg_running)
2190                 return 0;
2191         else if (scattered < (dev->param.chunks_per_block * 2))
2192                 return 0;
2193         else if (erased_chunks > dev->n_free_chunks / 2)
2194                 return 0;
2195         else if (erased_chunks > dev->n_free_chunks / 4)
2196                 return 1;
2197         else
2198                 return 2;
2199 }
2200
2201 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
2202 {
2203
2204         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2205         unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
2206         unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
2207         int do_checkpoint;
2208
2209         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2210                 "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
2211                 gc_urgent,
2212                 sb->s_dirt ? "dirty" : "clean",
2213                 request_checkpoint ? "checkpoint requested" : "no checkpoint",
2214                 oneshot_checkpoint ? " one-shot" : "");
2215
2216         yaffs_gross_lock(dev);
2217         do_checkpoint = ((request_checkpoint && !gc_urgent) ||
2218                          oneshot_checkpoint) && !dev->is_checkpointed;
2219
2220         if (sb->s_dirt || do_checkpoint) {
2221                 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
2222                 sb->s_dirt = 0;
2223                 if (oneshot_checkpoint)
2224                         yaffs_auto_checkpoint &= ~4;
2225         }
2226         yaffs_gross_unlock(dev);
2227
2228         return 0;
2229 }
2230
2231 /*
2232  * yaffs background thread functions .
2233  * yaffs_bg_thread_fn() the thread function
2234  * yaffs_bg_start() launches the background thread.
2235  * yaffs_bg_stop() cleans up the background thread.
2236  *
2237  * NB:
2238  * The thread should only run after the yaffs is initialised
2239  * The thread should be stopped before yaffs is unmounted.
2240  * The thread should not do any writing while the fs is in read only.
2241  */
2242
2243 #ifdef YAFFS_COMPILE_BACKGROUND
2244
2245 void yaffs_background_waker(unsigned long data)
2246 {
2247         wake_up_process((struct task_struct *)data);
2248 }
2249
2250 static int yaffs_bg_thread_fn(void *data)
2251 {
2252         struct yaffs_dev *dev = (struct yaffs_dev *)data;
2253         struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2254         unsigned long now = jiffies;
2255         unsigned long next_dir_update = now;
2256         unsigned long next_gc = now;
2257         unsigned long expires;
2258         unsigned int urgency;
2259
2260         int gc_result;
2261         struct timer_list timer;
2262
2263         yaffs_trace(YAFFS_TRACE_BACKGROUND,
2264                 "yaffs_background starting for dev %p", (void *)dev);
2265
2266 #ifdef YAFFS_COMPILE_FREEZER
2267         set_freezable();
2268 #endif
2269         while (context->bg_running) {
2270                 yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
2271
2272                 if (kthread_should_stop())
2273                         break;
2274
2275 #ifdef YAFFS_COMPILE_FREEZER
2276                 if (try_to_freeze())
2277                         continue;
2278 #endif
2279                 yaffs_gross_lock(dev);
2280
2281                 now = jiffies;
2282
2283                 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
2284                         yaffs_update_dirty_dirs(dev);
2285                         next_dir_update = now + HZ;
2286                 }
2287
2288                 if (time_after(now, next_gc) && yaffs_bg_enable) {
2289                         if (!dev->is_checkpointed) {
2290                                 urgency = yaffs_bg_gc_urgency(dev);
2291                                 gc_result = yaffs_bg_gc(dev, urgency);
2292                                 if (urgency > 1)
2293                                         next_gc = now + HZ / 20 + 1;
2294                                 else if (urgency > 0)
2295                                         next_gc = now + HZ / 10 + 1;
2296                                 else
2297                                         next_gc = now + HZ * 2;
2298                         } else  {
2299                                 /*
2300                                  * gc not running so set to next_dir_update
2301                                  * to cut down on wake ups
2302                                  */
2303                                 next_gc = next_dir_update;
2304                         }
2305                 }
2306                 yaffs_gross_unlock(dev);
2307 #if 1
2308                 expires = next_dir_update;
2309                 if (time_before(next_gc, expires))
2310                         expires = next_gc;
2311                 if (time_before(expires, now))
2312                         expires = now + HZ;
2313
2314                 Y_INIT_TIMER(&timer);
2315                 timer.expires = expires + 1;
2316                 timer.data = (unsigned long)current;
2317                 timer.function = yaffs_background_waker;
2318
2319                 set_current_state(TASK_INTERRUPTIBLE);
2320                 add_timer(&timer);
2321                 schedule();
2322                 del_timer_sync(&timer);
2323 #else
2324                 msleep(10);
2325 #endif
2326         }
2327
2328         return 0;
2329 }
2330
2331 static int yaffs_bg_start(struct yaffs_dev *dev)
2332 {
2333         int retval = 0;
2334         struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2335
2336         if (dev->read_only)
2337                 return -1;
2338
2339         context->bg_running = 1;
2340
2341         context->bg_thread = kthread_run(yaffs_bg_thread_fn,
2342                                          (void *)dev, "yaffs-bg-%d",
2343                                          context->mount_id);
2344
2345         if (IS_ERR(context->bg_thread)) {
2346                 retval = PTR_ERR(context->bg_thread);
2347                 context->bg_thread = NULL;
2348                 context->bg_running = 0;
2349         }
2350         return retval;
2351 }
2352
2353 static void yaffs_bg_stop(struct yaffs_dev *dev)
2354 {
2355         struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
2356
2357         ctxt->bg_running = 0;
2358
2359         if (ctxt->bg_thread) {
2360                 kthread_stop(ctxt->bg_thread);
2361                 ctxt->bg_thread = NULL;
2362         }
2363 }
2364 #else
2365 static int yaffs_bg_thread_fn(void *data)
2366 {
2367         return 0;
2368 }
2369
2370 static int yaffs_bg_start(struct yaffs_dev *dev)
2371 {
2372         return 0;
2373 }
2374
2375 static void yaffs_bg_stop(struct yaffs_dev *dev)
2376 {
2377 }
2378 #endif
2379
2380 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2381 static void yaffs_write_super(struct super_block *sb)
2382 #else
2383 static int yaffs_write_super(struct super_block *sb)
2384 #endif
2385 {
2386         unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2387
2388         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2389                 "yaffs_write_super %s",
2390                 request_checkpoint ? " checkpt" : "");
2391
2392         yaffs_do_sync_fs(sb, request_checkpoint);
2393
2394 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
2395         return 0;
2396 #endif
2397 }
2398
2399 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2400 static int yaffs_sync_fs(struct super_block *sb, int wait)
2401 #else
2402 static int yaffs_sync_fs(struct super_block *sb)
2403 #endif
2404 {
2405         unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2406
2407         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2408                 "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
2409
2410         yaffs_do_sync_fs(sb, request_checkpoint);
2411
2412         return 0;
2413 }
2414
2415 #ifdef YAFFS_USE_OWN_IGET
2416
2417 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
2418 {
2419         struct inode *inode;
2420         struct yaffs_obj *obj;
2421         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2422
2423         yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
2424
2425         inode = iget_locked(sb, ino);
2426         if (!inode)
2427                 return ERR_PTR(-ENOMEM);
2428         if (!(inode->i_state & I_NEW))
2429                 return inode;
2430
2431         /* NB This is called as a side effect of other functions, but
2432          * we had to release the lock to prevent deadlocks, so
2433          * need to lock again.
2434          */
2435
2436         yaffs_gross_lock(dev);
2437
2438         obj = yaffs_find_by_number(dev, inode->i_ino);
2439
2440         yaffs_fill_inode_from_obj(inode, obj);
2441
2442         yaffs_gross_unlock(dev);
2443
2444         unlock_new_inode(inode);
2445         return inode;
2446 }
2447
2448 #else
2449
2450 static void yaffs_read_inode(struct inode *inode)
2451 {
2452         /* NB This is called as a side effect of other functions, but
2453          * we had to release the lock to prevent deadlocks, so
2454          * need to lock again.
2455          */
2456
2457         struct yaffs_obj *obj;
2458         struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb);
2459
2460         yaffs_trace(YAFFS_TRACE_OS,
2461                 "yaffs_read_inode for %d", (int)inode->i_ino);
2462
2463         if (current != yaffs_dev_to_lc(dev)->readdir_process)
2464                 yaffs_gross_lock(dev);
2465
2466         obj = yaffs_find_by_number(dev, inode->i_ino);
2467
2468         yaffs_fill_inode_from_obj(inode, obj);
2469
2470         if (current != yaffs_dev_to_lc(dev)->readdir_process)
2471                 yaffs_gross_unlock(dev);
2472 }
2473
2474 #endif
2475
2476 static LIST_HEAD(yaffs_context_list);
2477 struct mutex yaffs_context_lock;
2478
2479 static void yaffs_put_super(struct super_block *sb)
2480 {
2481         struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2482
2483         yaffs_trace(YAFFS_TRACE_OS, "yaffs_put_super");
2484
2485         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2486                 "Shutting down yaffs background thread");
2487         yaffs_bg_stop(dev);
2488         yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2489                 "yaffs background thread shut down");
2490
2491         yaffs_gross_lock(dev);
2492
2493         yaffs_flush_super(sb, 1);
2494
2495         if (yaffs_dev_to_lc(dev)->put_super_fn)
2496                 yaffs_dev_to_lc(dev)->put_super_fn(sb);
2497
2498         yaffs_deinitialise(dev);
2499
2500         yaffs_gross_unlock(dev);
2501
2502         mutex_lock(&yaffs_context_lock);
2503         list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
2504         mutex_unlock(&yaffs_context_lock);
2505
2506         if (yaffs_dev_to_lc(dev)->spare_buffer) {
2507                 kfree(yaffs_dev_to_lc(dev)->spare_buffer);
2508                 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
2509         }
2510
2511         kfree(dev);
2512 }
2513
2514 static void yaffs_mtd_put_super(struct super_block *sb)
2515 {
2516         struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
2517
2518         if (mtd->sync)
2519                 mtd->sync(mtd);
2520
2521         put_mtd_device(mtd);
2522 }
2523
2524 static void yaffs_touch_super(struct yaffs_dev *dev)
2525 {
2526         struct super_block *sb = yaffs_dev_to_lc(dev)->super;
2527
2528         yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb);
2529         if (sb)
2530                 sb->s_dirt = 1;
2531 }
2532
2533 struct yaffs_options {
2534         int inband_tags;
2535         int skip_checkpoint_read;
2536         int skip_checkpoint_write;
2537         int no_cache;
2538         int tags_ecc_on;
2539         int tags_ecc_overridden;
2540         int lazy_loading_enabled;
2541         int lazy_loading_overridden;
2542         int empty_lost_and_found;
2543         int empty_lost_and_found_overridden;
2544         int disable_summary;
2545 };
2546
2547 #define MAX_OPT_LEN 30
2548 static int yaffs_parse_options(struct yaffs_options *options,
2549                                const char *options_str)
2550 {
2551         char cur_opt[MAX_OPT_LEN + 1];
2552         int p;
2553         int error = 0;
2554
2555         /* Parse through the options which is a comma seperated list */
2556
2557         while (options_str && *options_str && !error) {
2558                 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2559                 p = 0;
2560
2561                 while (*options_str == ',')
2562                         options_str++;
2563
2564                 while (*options_str && *options_str != ',') {
2565                         if (p < MAX_OPT_LEN) {
2566                                 cur_opt[p] = *options_str;
2567                                 p++;
2568                         }
2569                         options_str++;
2570                 }
2571
2572                 if (!strcmp(cur_opt, "inband-tags")) {
2573                         options->inband_tags = 1;
2574                 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
2575                         options->tags_ecc_on = 0;
2576                         options->tags_ecc_overridden = 1;
2577                 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
2578                         options->tags_ecc_on = 1;
2579                         options->tags_ecc_overridden = 1;
2580                 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
2581                         options->lazy_loading_enabled = 0;
2582                         options->lazy_loading_overridden = 1;
2583                 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
2584                         options->lazy_loading_enabled = 1;
2585                         options->lazy_loading_overridden = 1;
2586                 } else if (!strcmp(cur_opt, "disable-summary")) {
2587                         options->disable_summary = 1;
2588                 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
2589                         options->empty_lost_and_found = 0;
2590                         options->empty_lost_and_found_overridden = 1;
2591                 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
2592                         options->empty_lost_and_found = 1;
2593                         options->empty_lost_and_found_overridden = 1;
2594                 } else if (!strcmp(cur_opt, "no-cache")) {
2595                         options->no_cache = 1;
2596                 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
2597                         options->skip_checkpoint_read = 1;
2598                 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
2599                         options->skip_checkpoint_write = 1;
2600                 } else if (!strcmp(cur_opt, "no-checkpoint")) {
2601                         options->skip_checkpoint_read = 1;
2602                         options->skip_checkpoint_write = 1;
2603                 } else {
2604                         printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2605                                cur_opt);
2606                         error = 1;
2607                 }
2608         }
2609
2610         return error;
2611 }
2612
2613 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2614                                                      struct super_block *sb,
2615                                                      void *data, int silent)
2616 {
2617         int n_blocks;
2618         struct inode *inode = NULL;
2619         struct dentry *root;
2620         struct yaffs_dev *dev = 0;
2621         char devname_buf[BDEVNAME_SIZE + 1];
2622         struct mtd_info *mtd;
2623         int err;
2624         char *data_str = (char *)data;
2625         struct yaffs_linux_context *context = NULL;
2626         struct yaffs_param *param;
2627
2628         int read_only = 0;
2629
2630         struct yaffs_options options;
2631
2632         unsigned mount_id;
2633         int found;
2634         struct yaffs_linux_context *context_iterator;
2635         struct list_head *l;
2636
2637         if (!sb) {
2638                 printk(KERN_INFO "yaffs: sb is NULL\n");
2639                 return NULL;
2640         }
2641
2642         sb->s_magic = YAFFS_MAGIC;
2643         sb->s_op = &yaffs_super_ops;
2644         sb->s_flags |= MS_NOATIME;
2645
2646         read_only = ((sb->s_flags & MS_RDONLY) != 0);
2647
2648 #ifdef YAFFS_COMPILE_EXPORTFS
2649         sb->s_export_op = &yaffs_export_ops;
2650 #endif
2651
2652         if (!sb->s_dev)
2653                 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2654         else if (!yaffs_devname(sb, devname_buf))
2655                 printk(KERN_INFO "yaffs: devname is NULL\n");
2656         else
2657                 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2658                        sb->s_dev,
2659                        yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
2660
2661         if (!data_str)
2662                 data_str = "";
2663
2664         printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2665
2666         memset(&options, 0, sizeof(options));
2667
2668         if (yaffs_parse_options(&options, data_str)) {
2669                 /* Option parsing failed */
2670                 return NULL;
2671         }
2672
2673         sb->s_blocksize = PAGE_CACHE_SIZE;
2674         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2675
2676         yaffs_trace(YAFFS_TRACE_OS,
2677                 "yaffs_read_super: Using yaffs%d", yaffs_version);
2678         yaffs_trace(YAFFS_TRACE_OS,
2679                 "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
2680
2681         yaffs_trace(YAFFS_TRACE_ALWAYS,
2682                 "yaffs: Attempting MTD mount of %u.%u,\"%s\"",
2683                 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2684                 yaffs_devname(sb, devname_buf));
2685
2686         /* Check it's an mtd device..... */
2687         if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2688                 return NULL;    /* This isn't an mtd device */
2689
2690         /* Get the device */
2691         mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2692         if (!mtd) {
2693                 yaffs_trace(YAFFS_TRACE_ALWAYS,
2694                         "yaffs: MTD device #%u doesn't appear to exist",
2695                         MINOR(sb->s_dev));
2696                 return NULL;
2697         }
2698         /* Check it's NAND */
2699         if (mtd->type != MTD_NANDFLASH) {
2700                 yaffs_trace(YAFFS_TRACE_ALWAYS,
2701                         "yaffs: MTD device is not NAND it's type %d",
2702                         mtd->type);
2703                 return NULL;
2704         }
2705
2706         yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->erase);
2707         yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->read);
2708         yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->write);
2709         yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->read_oob);
2710         yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->write_oob);
2711         yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->block_isbad);
2712         yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->block_markbad);
2713         yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
2714         yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
2715         yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
2716 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
2717         yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size);
2718 #else
2719         yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
2720 #endif
2721
2722         if (yaffs_auto_select && yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
2723                 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
2724                 yaffs_version = 2;
2725         }
2726
2727         /* Added NCB 26/5/2006 for completeness */
2728         if (yaffs_version == 2 && !options.inband_tags
2729             && WRITE_SIZE(mtd) == 512) {
2730                 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
2731                 yaffs_version = 1;
2732         }
2733
2734         if (yaffs_version == 2) {
2735                 /* Check for version 2 style functions */
2736                 if (!mtd->erase ||
2737                     !mtd->block_isbad ||
2738                     !mtd->block_markbad || !mtd->read || !mtd->write ||
2739 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2740                     !mtd->read_oob || !mtd->write_oob) {
2741 #else
2742                     !mtd->write_ecc ||
2743                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2744 #endif
2745                         yaffs_trace(YAFFS_TRACE_ALWAYS,
2746                                 "MTD device does not support required functions"
2747                         );
2748                         return NULL;
2749                 }
2750
2751                 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2752                      mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2753                     !options.inband_tags) {
2754                         yaffs_trace(YAFFS_TRACE_ALWAYS,
2755                                 "MTD device does not have the right page sizes"
2756                         );
2757                         return NULL;
2758                 }
2759         } else {
2760                 /* Check for V1 style functions */
2761                 if (!mtd->erase || !mtd->read || !mtd->write ||
2762 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2763                     !mtd->read_oob || !mtd->write_oob) {
2764 #else
2765                     !mtd->write_ecc ||
2766                     !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2767 #endif
2768                         yaffs_trace(YAFFS_TRACE_ALWAYS,
2769                                 "MTD device does not support required functions"
2770                         );
2771                         return NULL;
2772                 }
2773
2774                 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2775                     mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2776                         yaffs_trace(YAFFS_TRACE_ALWAYS,
2777                                 "MTD device does not support have the right page sizes"
2778                         );
2779                         return NULL;
2780                 }
2781         }
2782
2783         /* OK, so if we got here, we have an MTD that's NAND and looks
2784          * like it has the right capabilities
2785          * Set the struct yaffs_dev up for mtd
2786          */
2787
2788         if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2789                 read_only = 1;
2790                 printk(KERN_INFO
2791                        "yaffs: mtd is read only, setting superblock read only\n"
2792                 );
2793                 sb->s_flags |= MS_RDONLY;
2794         }
2795
2796         dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2797         context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2798
2799         if (!dev || !context) {
2800                 if (dev)
2801                         kfree(dev);
2802                 if (context)
2803                         kfree(context);
2804                 dev = NULL;
2805                 context = NULL;
2806         }
2807
2808         if (!dev) {
2809                 /* Deep shit could not allocate device structure */
2810                 yaffs_trace(YAFFS_TRACE_ALWAYS,
2811                         "yaffs_read_super: Failed trying to allocate struct yaffs_dev."
2812                 );
2813                 return NULL;
2814         }
2815         memset(dev, 0, sizeof(struct yaffs_dev));
2816         param = &(dev->param);
2817
2818         memset(context, 0, sizeof(struct yaffs_linux_context));
2819         dev->os_context = context;
2820         INIT_LIST_HEAD(&(context->context_list));
2821         context->dev = dev;
2822         context->super = sb;
2823
2824         dev->read_only = read_only;
2825
2826 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2827         sb->s_fs_info = dev;
2828 #else
2829         sb->u.generic_sbp = dev;
2830 #endif
2831
2832         dev->driver_context = mtd;
2833         param->name = mtd->name;
2834
2835         /* Set up the memory size parameters.... */
2836
2837         n_blocks =
2838             YCALCBLOCKS(mtd->size,
2839                         (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2840
2841         param->start_block = 0;
2842         param->end_block = n_blocks - 1;
2843         param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2844         param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2845         param->n_reserved_blocks = 5;
2846         param->n_caches = (options.no_cache) ? 0 : 10;
2847         param->inband_tags = options.inband_tags;
2848
2849         param->enable_xattr = 1;
2850         if (options.lazy_loading_overridden)
2851                 param->disable_lazy_load = !options.lazy_loading_enabled;
2852
2853         param->defered_dir_update = 1;
2854
2855         if (options.tags_ecc_overridden)
2856                 param->no_tags_ecc = !options.tags_ecc_on;
2857
2858         param->empty_lost_n_found = 1;
2859         param->refresh_period = 500;
2860         param->disable_summary = options.disable_summary;
2861
2862         if (options.empty_lost_and_found_overridden)
2863                 param->empty_lost_n_found = options.empty_lost_and_found;
2864
2865         /* ... and the functions. */
2866         if (yaffs_version == 2) {
2867                 param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
2868                 param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
2869                 param->bad_block_fn = nandmtd2_mark_block_bad;
2870                 param->query_block_fn = nandmtd2_query_block;
2871                 yaffs_dev_to_lc(dev)->spare_buffer =
2872                                 kmalloc(mtd->oobsize, GFP_NOFS);
2873                 param->is_yaffs2 = 1;
2874 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2875                 param->total_bytes_per_chunk = mtd->writesize;
2876                 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2877 #else
2878                 param->total_bytes_per_chunk = mtd->oobblock;
2879                 param->chunks_per_block = mtd->erasesize / mtd->oobblock;
2880 #endif
2881                 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2882
2883                 param->start_block = 0;
2884                 param->end_block = n_blocks - 1;
2885         } else {
2886 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2887                 /* use the MTD interface in yaffs_mtdif1.c */
2888                 param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
2889                 param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
2890                 param->bad_block_fn = nandmtd1_mark_block_bad;
2891                 param->query_block_fn = nandmtd1_query_block;
2892 #else
2893                 param->write_chunk_fn = nandmtd_write_chunk;
2894                 param->read_chunk_fn = nandmtd_read_chunk;
2895 #endif
2896                 param->is_yaffs2 = 0;
2897         }
2898         /* ... and common functions */
2899         param->erase_fn = nandmtd_erase_block;
2900         param->initialise_flash_fn = nandmtd_initialise;
2901
2902         yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
2903
2904         param->sb_dirty_fn = yaffs_touch_super;
2905         param->gc_control = yaffs_gc_control_callback;
2906
2907         yaffs_dev_to_lc(dev)->super = sb;
2908
2909         param->use_nand_ecc = 1;
2910
2911         param->skip_checkpt_rd = options.skip_checkpoint_read;
2912         param->skip_checkpt_wr = options.skip_checkpoint_write;
2913
2914         mutex_lock(&yaffs_context_lock);
2915         /* Get a mount id */
2916         found = 0;
2917         for (mount_id = 0; !found; mount_id++) {
2918                 found = 1;
2919                 list_for_each(l, &yaffs_context_list) {
2920                         context_iterator =
2921                             list_entry(l, struct yaffs_linux_context,
2922                                        context_list);
2923                         if (context_iterator->mount_id == mount_id)
2924                                 found = 0;
2925                 }
2926         }
2927         context->mount_id = mount_id;
2928
2929         list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
2930                       &yaffs_context_list);
2931         mutex_unlock(&yaffs_context_lock);
2932
2933         /* Directory search handling... */
2934         INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2935         param->remove_obj_fn = yaffs_remove_obj_callback;
2936
2937         mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
2938
2939         yaffs_gross_lock(dev);
2940
2941         err = yaffs_guts_initialise(dev);
2942
2943         yaffs_trace(YAFFS_TRACE_OS,
2944                 "yaffs_read_super: guts initialised %s",
2945                 (err == YAFFS_OK) ? "OK" : "FAILED");
2946
2947         if (err == YAFFS_OK)
2948                 yaffs_bg_start(dev);
2949
2950         if (!context->bg_thread)
2951                 param->defered_dir_update = 0;
2952
2953         /* Release lock before yaffs_get_inode() */
2954         yaffs_gross_unlock(dev);
2955
2956         /* Create root inode */
2957         if (err == YAFFS_OK)
2958                 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
2959
2960         if (!inode)
2961                 return NULL;
2962
2963         inode->i_op = &yaffs_dir_inode_operations;
2964         inode->i_fop = &yaffs_dir_operations;
2965
2966         yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
2967
2968         root = d_alloc_root(inode);
2969
2970         yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done");
2971
2972         if (!root) {
2973                 iput(inode);
2974                 return NULL;
2975         }
2976         sb->s_root = root;
2977         sb->s_dirt = !dev->is_checkpointed;
2978         yaffs_trace(YAFFS_TRACE_ALWAYS,
2979                 "yaffs_read_super: is_checkpointed %d",
2980                 dev->is_checkpointed);
2981
2982         yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
2983         return sb;
2984 }
2985
2986 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2987 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2988                                          int silent)
2989 {
2990         return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2991 }
2992
2993 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
2994 static struct dentry *yaffs_mount(struct file_system_type *fs_type, int flags,
2995         const char *dev_name, void *data)
2996 {
2997     return mount_bdev(fs_type, flags, dev_name, data, yaffs_internal_read_super_mtd);
2998 }
2999 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3000 static int yaffs_read_super(struct file_system_type *fs,
3001                             int flags, const char *dev_name,
3002                             void *data, struct vfsmount *mnt)
3003 {
3004
3005         return get_sb_bdev(fs, flags, dev_name, data,
3006                            yaffs_internal_read_super_mtd, mnt);
3007 }
3008 #else
3009 static struct super_block *yaffs_read_super(struct file_system_type *fs,
3010                                             int flags, const char *dev_name,
3011                                             void *data)
3012 {
3013
3014         return get_sb_bdev(fs, flags, dev_name, data,
3015                            yaffs_internal_read_super_mtd);
3016 }
3017 #endif
3018
3019 static struct file_system_type yaffs_fs_type = {
3020         .owner = THIS_MODULE,
3021         .name = "yaffs",
3022 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
3023         .mount = yaffs_mount,
3024 #else
3025         .get_sb = yaffs_read_super,
3026 #endif
3027         .kill_sb = kill_block_super,
3028         .fs_flags = FS_REQUIRES_DEV,
3029 };
3030 #else
3031 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
3032                                             int silent)
3033 {
3034         return yaffs_internal_read_super(1, sb, data, silent);
3035 }
3036
3037 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
3038                       FS_REQUIRES_DEV);
3039 #endif
3040
3041
3042 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3043 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
3044                                           int silent)
3045 {
3046         return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
3047 }
3048
3049 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
3050 static struct dentry *yaffs2_mount(struct file_system_type *fs_type, int flags,
3051         const char *dev_name, void *data)
3052 {
3053         return mount_bdev(fs_type, flags, dev_name, data, yaffs2_internal_read_super_mtd);
3054 }
3055 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3056 static int yaffs2_read_super(struct file_system_type *fs,
3057                              int flags, const char *dev_name, void *data,
3058                              struct vfsmount *mnt)
3059 {
3060         return get_sb_bdev(fs, flags, dev_name, data,
3061                            yaffs2_internal_read_super_mtd, mnt);
3062 }
3063 #else
3064 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
3065                                              int flags, const char *dev_name,
3066                                              void *data)
3067 {
3068
3069         return get_sb_bdev(fs, flags, dev_name, data,
3070                            yaffs2_internal_read_super_mtd);
3071 }
3072 #endif
3073
3074 static struct file_system_type yaffs2_fs_type = {
3075         .owner = THIS_MODULE,
3076         .name = "yaffs2",
3077 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
3078         .mount = yaffs2_mount,
3079 #else
3080         .get_sb = yaffs2_read_super,
3081 #endif
3082         .kill_sb = kill_block_super,
3083         .fs_flags = FS_REQUIRES_DEV,
3084 };
3085 #else
3086 static struct super_block *yaffs2_read_super(struct super_block *sb,
3087                                              void *data, int silent)
3088 {
3089         return yaffs_internal_read_super(2, sb, data, silent);
3090 }
3091
3092 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
3093                       FS_REQUIRES_DEV);
3094 #endif
3095
3096
3097 static struct proc_dir_entry *my_proc_entry;
3098
3099 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
3100 {
3101         struct yaffs_param *param = &dev->param;
3102
3103         buf += sprintf(buf, "start_block.......... %d\n", param->start_block);
3104         buf += sprintf(buf, "end_block............ %d\n", param->end_block);
3105         buf += sprintf(buf, "total_bytes_per_chunk %d\n",
3106                                 param->total_bytes_per_chunk);
3107         buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc);
3108         buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc);
3109         buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2);
3110         buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags);
3111         buf += sprintf(buf, "empty_lost_n_found... %d\n",
3112                                 param->empty_lost_n_found);
3113         buf += sprintf(buf, "disable_lazy_load.... %d\n",
3114                                 param->disable_lazy_load);
3115         buf += sprintf(buf, "refresh_period....... %d\n",
3116                                 param->refresh_period);
3117         buf += sprintf(buf, "n_caches............. %d\n", param->n_caches);
3118         buf += sprintf(buf, "n_reserved_blocks.... %d\n",
3119                                 param->n_reserved_blocks);
3120         buf += sprintf(buf, "always_check_erased.. %d\n",
3121                                 param->always_check_erased);
3122         buf += sprintf(buf, "\n");
3123
3124         return buf;
3125 }
3126
3127 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
3128 {
3129         buf += sprintf(buf, "data_bytes_per_chunk. %d\n",
3130                                 dev->data_bytes_per_chunk);
3131         buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
3132         buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
3133         buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
3134         buf += sprintf(buf, "blocks_in_checkpt.... %d\n",
3135                                 dev->blocks_in_checkpt);
3136         buf += sprintf(buf, "\n");
3137         buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
3138         buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
3139         buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
3140         buf += sprintf(buf, "\n");
3141         buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
3142         buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
3143         buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
3144         buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
3145         buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
3146         buf += sprintf(buf, "passive_gc_count..... %u\n",
3147                                 dev->passive_gc_count);
3148         buf += sprintf(buf, "oldest_dirty_gc_count %u\n",
3149                                 dev->oldest_dirty_gc_count);
3150         buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
3151         buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
3152         buf += sprintf(buf, "n_retried_writes..... %u\n",
3153                                 dev->n_retried_writes);
3154         buf += sprintf(buf, "n_retired_blocks..... %u\n",
3155                                 dev->n_retired_blocks);
3156         buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
3157         buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
3158         buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n",
3159                                 dev->n_tags_ecc_fixed);
3160         buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n",
3161                                 dev->n_tags_ecc_unfixed);
3162         buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
3163         buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
3164         buf += sprintf(buf, "n_unlinked_files..... %u\n",
3165                                 dev->n_unlinked_files);
3166         buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
3167         buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
3168         buf += sprintf(buf, "tags_used............ %u\n", dev->tags_used);
3169         buf += sprintf(buf, "summary_used......... %u\n", dev->summary_used);
3170
3171         return buf;
3172 }
3173
3174 static int yaffs_proc_read(char *page,
3175                            char **start,
3176                            off_t offset, int count, int *eof, void *data)
3177 {
3178         struct list_head *item;
3179         char *buf = page;
3180         int step = offset;
3181         int n = 0;
3182
3183         /* Get proc_file_read() to step 'offset' by one on each sucessive call.
3184          * We use 'offset' (*ppos) to indicate where we are in dev_list.
3185          * This also assumes the user has posted a read buffer large
3186          * enough to hold the complete output; but that's life in /proc.
3187          */
3188
3189         *(int *)start = 1;
3190
3191         /* Print header first */
3192         if (step == 0)
3193                 buf +=
3194                     sprintf(buf,
3195                             "Multi-version YAFFS built:" __DATE__ " " __TIME__
3196                             "\n");
3197         else if (step == 1)
3198                 buf += sprintf(buf, "\n");
3199         else {
3200                 step -= 2;
3201
3202                 mutex_lock(&yaffs_context_lock);
3203
3204                 /* Locate and print the Nth entry.  Order N-squared but N is small. */
3205                 list_for_each(item, &yaffs_context_list) {
3206                         struct yaffs_linux_context *dc =
3207                             list_entry(item, struct yaffs_linux_context,
3208                                        context_list);
3209                         struct yaffs_dev *dev = dc->dev;
3210
3211                         if (n < (step & ~1)) {
3212                                 n += 2;
3213                                 continue;
3214                         }
3215                         if ((step & 1) == 0) {
3216                                 buf +=
3217                                     sprintf(buf, "\nDevice %d \"%s\"\n", n,
3218                                             dev->param.name);
3219                                 buf = yaffs_dump_dev_part0(buf, dev);
3220                         } else {
3221                                 buf = yaffs_dump_dev_part1(buf, dev);
3222                         }
3223
3224                         break;
3225                 }
3226                 mutex_unlock(&yaffs_context_lock);
3227         }
3228
3229         return buf - page < count ? buf - page : count;
3230 }
3231
3232 /**
3233  * Set the verbosity of the warnings and error messages.
3234  *
3235  * Note that the names can only be a..z or _ with the current code.
3236  */
3237
3238 static struct {
3239         char *mask_name;
3240         unsigned mask_bitfield;
3241 } mask_flags[] = {
3242         {"allocate", YAFFS_TRACE_ALLOCATE},
3243         {"always", YAFFS_TRACE_ALWAYS},
3244         {"background", YAFFS_TRACE_BACKGROUND},
3245         {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
3246         {"buffers", YAFFS_TRACE_BUFFERS},
3247         {"bug", YAFFS_TRACE_BUG},
3248         {"checkpt", YAFFS_TRACE_CHECKPOINT},
3249         {"deletion", YAFFS_TRACE_DELETION},
3250         {"erase", YAFFS_TRACE_ERASE},
3251         {"error", YAFFS_TRACE_ERROR},
3252         {"gc_detail", YAFFS_TRACE_GC_DETAIL},
3253         {"gc", YAFFS_TRACE_GC},
3254         {"lock", YAFFS_TRACE_LOCK},
3255         {"mtd", YAFFS_TRACE_MTD},
3256         {"nandaccess", YAFFS_TRACE_NANDACCESS},
3257         {"os", YAFFS_TRACE_OS},
3258         {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
3259         {"scan", YAFFS_TRACE_SCAN},
3260         {"mount", YAFFS_TRACE_MOUNT},
3261         {"tracing", YAFFS_TRACE_TRACING},
3262         {"sync", YAFFS_TRACE_SYNC},
3263         {"write", YAFFS_TRACE_WRITE},
3264         {"verify", YAFFS_TRACE_VERIFY},
3265         {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
3266         {"verify_full", YAFFS_TRACE_VERIFY_FULL},
3267         {"verify_all", YAFFS_TRACE_VERIFY_ALL},
3268         {"all", 0xffffffff},
3269         {"none", 0},
3270         {NULL, 0},
3271 };
3272
3273 #define MAX_MASK_NAME_LENGTH 40
3274 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
3275                                           unsigned long count, void *data)
3276 {
3277         unsigned rg = 0, mask_bitfield;
3278         char *end;
3279         char *mask_name;
3280         const char *x;
3281         char substring[MAX_MASK_NAME_LENGTH + 1];
3282         int i;
3283         int done = 0;
3284         int add, len = 0;
3285         int pos = 0;
3286
3287         rg = yaffs_trace_mask;
3288
3289         while (!done && (pos < count)) {
3290                 done = 1;
3291                 while ((pos < count) && isspace(buf[pos]))
3292                         pos++;
3293
3294                 switch (buf[pos]) {
3295                 case '+':
3296                 case '-':
3297                 case '=':
3298                         add = buf[pos];
3299                         pos++;
3300                         break;
3301
3302                 default:
3303                         add = ' ';
3304                         break;
3305                 }
3306                 mask_name = NULL;
3307
3308                 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
3309
3310                 if (end > buf + pos) {
3311                         mask_name = "numeral";
3312                         len = end - (buf + pos);
3313                         pos += len;
3314                         done = 0;
3315                 } else {
3316                         for (x = buf + pos, i = 0;
3317                              (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
3318                              i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
3319                                 substring[i] = *x;
3320                         substring[i] = '\0';
3321
3322                         for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3323                                 if (strcmp(substring, mask_flags[i].mask_name)
3324                                     == 0) {
3325                                         mask_name = mask_flags[i].mask_name;
3326                                         mask_bitfield =
3327                                             mask_flags[i].mask_bitfield;
3328                                         done = 0;
3329                                         break;
3330                                 }
3331                         }
3332                 }
3333
3334                 if (mask_name != NULL) {
3335                         done = 0;
3336                         switch (add) {
3337                         case '-':
3338                                 rg &= ~mask_bitfield;
3339                                 break;
3340                         case '+':
3341                                 rg |= mask_bitfield;
3342                                 break;
3343                         case '=':
3344                                 rg = mask_bitfield;
3345                                 break;
3346                         default:
3347                                 rg |= mask_bitfield;
3348                                 break;
3349                         }
3350                 }
3351         }
3352
3353         yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
3354
3355         printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
3356
3357         if (rg & YAFFS_TRACE_ALWAYS) {
3358                 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3359                         char flag;
3360                         flag = ((rg & mask_flags[i].mask_bitfield) ==
3361                                 mask_flags[i].mask_bitfield) ? '+' : '-';
3362                         printk(KERN_DEBUG "%c%s\n", flag,
3363                                mask_flags[i].mask_name);
3364                 }
3365         }
3366
3367         return count;
3368 }
3369
3370 static int yaffs_proc_write(struct file *file, const char *buf,
3371                             unsigned long count, void *data)
3372 {
3373         return yaffs_proc_write_trace_options(file, buf, count, data);
3374 }
3375
3376 /* Stuff to handle installation of file systems */
3377 struct file_system_to_install {
3378         struct file_system_type *fst;
3379         int installed;
3380 };
3381
3382 static struct file_system_to_install fs_to_install[] = {
3383         {&yaffs_fs_type, 0},
3384         {&yaffs2_fs_type, 0},
3385         {NULL, 0}
3386 };
3387
3388 static int __init init_yaffs_fs(void)
3389 {
3390         int error = 0;
3391         struct file_system_to_install *fsinst;
3392
3393         yaffs_trace(YAFFS_TRACE_ALWAYS,
3394                 "yaffs built " __DATE__ " " __TIME__ " Installing.");
3395
3396         mutex_init(&yaffs_context_lock);
3397
3398         /* Install the proc_fs entries */
3399         my_proc_entry = create_proc_entry("yaffs",
3400                                           S_IRUGO | S_IFREG, YPROC_ROOT);
3401
3402         if (my_proc_entry) {
3403                 my_proc_entry->write_proc = yaffs_proc_write;
3404                 my_proc_entry->read_proc = yaffs_proc_read;
3405                 my_proc_entry->data = NULL;
3406         } else {
3407                 return -ENOMEM;
3408         }
3409
3410         /* Now add the file system entries */
3411
3412         fsinst = fs_to_install;
3413
3414         while (fsinst->fst && !error) {
3415                 error = register_filesystem(fsinst->fst);
3416                 if (!error)
3417                         fsinst->installed = 1;
3418                 fsinst++;
3419         }
3420
3421         /* Any errors? uninstall  */
3422         if (error) {
3423                 fsinst = fs_to_install;
3424
3425                 while (fsinst->fst) {
3426                         if (fsinst->installed) {
3427                                 unregister_filesystem(fsinst->fst);
3428                                 fsinst->installed = 0;
3429                         }
3430                         fsinst++;
3431                 }
3432         }
3433
3434         return error;
3435 }
3436
3437 static void __exit exit_yaffs_fs(void)
3438 {
3439
3440         struct file_system_to_install *fsinst;
3441
3442         yaffs_trace(YAFFS_TRACE_ALWAYS,
3443                 "yaffs built " __DATE__ " " __TIME__ " removing.");
3444
3445         remove_proc_entry("yaffs", YPROC_ROOT);
3446
3447         fsinst = fs_to_install;
3448
3449         while (fsinst->fst) {
3450                 if (fsinst->installed) {
3451                         unregister_filesystem(fsinst->fst);
3452                         fsinst->installed = 0;
3453                 }
3454                 fsinst++;
3455         }
3456 }
3457
3458 module_init(init_yaffs_fs)
3459     module_exit(exit_yaffs_fs)
3460
3461     MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3462 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011");
3463 MODULE_LICENSE("GPL");