Arve Hjønnevåg | 3de69a7 | 2010-05-18 20:35:30 -0700 | [diff] [blame] | 1 | /* |
| 2 | * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. |
| 3 | * |
| 4 | * Copyright (C) 2002-2010 Aleph One Ltd. |
| 5 | * for Toby Churchill Ltd and Brightstar Engineering |
| 6 | * |
| 7 | * Created by Charles Manning <charles@aleph1.co.uk> |
| 8 | * Acknowledgements: |
| 9 | * Luc van OostenRyck for numerous patches. |
| 10 | * Nick Bane for numerous patches. |
| 11 | * Nick Bane for 2.5/2.6 integration. |
| 12 | * Andras Toth for mknod rdev issue. |
| 13 | * Michael Fischer for finding the problem with inode inconsistency. |
| 14 | * Some code bodily lifted from JFFS |
| 15 | * |
| 16 | * This program is free software; you can redistribute it and/or modify |
| 17 | * it under the terms of the GNU General Public License version 2 as |
| 18 | * published by the Free Software Foundation. |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * |
| 23 | * This is the file system front-end to YAFFS that hooks it up to |
| 24 | * the VFS. |
| 25 | * |
| 26 | * Special notes: |
| 27 | * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with |
| 28 | * this superblock |
| 29 | * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this |
| 30 | * superblock |
| 31 | * >> inode->u.generic_ip points to the associated struct yaffs_obj. |
| 32 | */ |
| 33 | |
| 34 | /* |
| 35 | * NB There are two variants of Linux VFS glue code. This variant supports |
| 36 | * a single version and should not include any multi-version code. |
| 37 | */ |
| 38 | #include <linux/version.h> |
| 39 | |
| 40 | #include <linux/kernel.h> |
| 41 | #include <linux/module.h> |
| 42 | #include <linux/slab.h> |
| 43 | #include <linux/init.h> |
| 44 | #include <linux/fs.h> |
| 45 | #include <linux/proc_fs.h> |
| 46 | #include <linux/smp_lock.h> |
| 47 | #include <linux/pagemap.h> |
| 48 | #include <linux/mtd/mtd.h> |
| 49 | #include <linux/interrupt.h> |
| 50 | #include <linux/string.h> |
| 51 | #include <linux/ctype.h> |
| 52 | #include <linux/namei.h> |
| 53 | #include <linux/exportfs.h> |
| 54 | #include <linux/kthread.h> |
| 55 | #include <linux/delay.h> |
| 56 | #include <linux/freezer.h> |
| 57 | |
| 58 | #include <asm/div64.h> |
| 59 | |
| 60 | #include <linux/statfs.h> |
| 61 | |
| 62 | #define UnlockPage(p) unlock_page(p) |
| 63 | #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags) |
| 64 | |
| 65 | #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf) |
| 66 | |
| 67 | #define YPROC_ROOT NULL |
| 68 | |
| 69 | #define Y_INIT_TIMER(a) init_timer_on_stack(a) |
| 70 | |
| 71 | #define WRITE_SIZE_STR "writesize" |
| 72 | #define WRITE_SIZE(mtd) ((mtd)->writesize) |
| 73 | |
| 74 | static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size) |
| 75 | { |
| 76 | uint64_t result = partition_size; |
| 77 | do_div(result, block_size); |
| 78 | return (uint32_t) result; |
| 79 | } |
| 80 | |
| 81 | #include <linux/uaccess.h> |
| 82 | #include <linux/mtd/mtd.h> |
| 83 | |
| 84 | #include "yportenv.h" |
| 85 | #include "yaffs_trace.h" |
| 86 | #include "yaffs_guts.h" |
| 87 | #include "yaffs_attribs.h" |
| 88 | |
| 89 | #include "yaffs_linux.h" |
| 90 | |
| 91 | #include "yaffs_mtdif.h" |
| 92 | #include "yaffs_mtdif1.h" |
| 93 | #include "yaffs_mtdif2.h" |
| 94 | |
| 95 | unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS; |
| 96 | unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS; |
| 97 | unsigned int yaffs_auto_checkpoint = 1; |
| 98 | unsigned int yaffs_gc_control = 1; |
| 99 | unsigned int yaffs_bg_enable = 1; |
| 100 | |
| 101 | /* Module Parameters */ |
| 102 | module_param(yaffs_trace_mask, uint, 0644); |
| 103 | module_param(yaffs_wr_attempts, uint, 0644); |
| 104 | module_param(yaffs_auto_checkpoint, uint, 0644); |
| 105 | module_param(yaffs_gc_control, uint, 0644); |
| 106 | module_param(yaffs_bg_enable, uint, 0644); |
| 107 | |
| 108 | |
| 109 | #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private) |
| 110 | #define yaffs_inode_to_obj(iptr) ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr))) |
| 111 | #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode) |
| 112 | #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info) |
| 113 | |
| 114 | #define update_dir_time(dir) do {\ |
| 115 | (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \ |
| 116 | } while(0) |
| 117 | |
| 118 | |
| 119 | static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev) |
| 120 | { |
| 121 | return yaffs_gc_control; |
| 122 | } |
| 123 | |
| 124 | static void yaffs_gross_lock(struct yaffs_dev *dev) |
| 125 | { |
| 126 | yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current); |
| 127 | mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock)); |
| 128 | yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current); |
| 129 | } |
| 130 | |
| 131 | static void yaffs_gross_unlock(struct yaffs_dev *dev) |
| 132 | { |
| 133 | yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current); |
| 134 | mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock)); |
| 135 | } |
| 136 | |
| 137 | static void yaffs_fill_inode_from_obj(struct inode *inode, |
| 138 | struct yaffs_obj *obj); |
| 139 | |
| 140 | static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino) |
| 141 | { |
| 142 | struct inode *inode; |
| 143 | struct yaffs_obj *obj; |
| 144 | struct yaffs_dev *dev = yaffs_super_to_dev(sb); |
| 145 | |
| 146 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino); |
| 147 | |
| 148 | inode = iget_locked(sb, ino); |
| 149 | if (!inode) |
| 150 | return ERR_PTR(-ENOMEM); |
| 151 | if (!(inode->i_state & I_NEW)) |
| 152 | return inode; |
| 153 | |
| 154 | /* NB This is called as a side effect of other functions, but |
| 155 | * we had to release the lock to prevent deadlocks, so |
| 156 | * need to lock again. |
| 157 | */ |
| 158 | |
| 159 | yaffs_gross_lock(dev); |
| 160 | |
| 161 | obj = yaffs_find_by_number(dev, inode->i_ino); |
| 162 | |
| 163 | yaffs_fill_inode_from_obj(inode, obj); |
| 164 | |
| 165 | yaffs_gross_unlock(dev); |
| 166 | |
| 167 | unlock_new_inode(inode); |
| 168 | return inode; |
| 169 | } |
| 170 | |
| 171 | struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, |
| 172 | struct yaffs_obj *obj) |
| 173 | { |
| 174 | struct inode *inode; |
| 175 | |
| 176 | if (!sb) { |
| 177 | yaffs_trace(YAFFS_TRACE_OS, |
| 178 | "yaffs_get_inode for NULL super_block!!"); |
| 179 | return NULL; |
| 180 | |
| 181 | } |
| 182 | |
| 183 | if (!obj) { |
| 184 | yaffs_trace(YAFFS_TRACE_OS, |
| 185 | "yaffs_get_inode for NULL object!!"); |
| 186 | return NULL; |
| 187 | |
| 188 | } |
| 189 | |
| 190 | yaffs_trace(YAFFS_TRACE_OS, |
| 191 | "yaffs_get_inode for object %d", |
| 192 | obj->obj_id); |
| 193 | |
| 194 | inode = yaffs_iget(sb, obj->obj_id); |
| 195 | if (IS_ERR(inode)) |
| 196 | return NULL; |
| 197 | |
| 198 | /* NB Side effect: iget calls back to yaffs_read_inode(). */ |
| 199 | /* iget also increments the inode's i_count */ |
| 200 | /* NB You can't be holding gross_lock or deadlock will happen! */ |
| 201 | |
| 202 | return inode; |
| 203 | } |
| 204 | |
| 205 | static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, |
| 206 | dev_t rdev) |
| 207 | { |
| 208 | struct inode *inode; |
| 209 | |
| 210 | struct yaffs_obj *obj = NULL; |
| 211 | struct yaffs_dev *dev; |
| 212 | |
| 213 | struct yaffs_obj *parent = yaffs_inode_to_obj(dir); |
| 214 | |
| 215 | int error = -ENOSPC; |
| 216 | uid_t uid = current->cred->fsuid; |
| 217 | gid_t gid = |
| 218 | (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid; |
| 219 | |
| 220 | if ((dir->i_mode & S_ISGID) && S_ISDIR(mode)) |
| 221 | mode |= S_ISGID; |
| 222 | |
| 223 | if (parent) { |
| 224 | yaffs_trace(YAFFS_TRACE_OS, |
| 225 | "yaffs_mknod: parent object %d type %d", |
| 226 | parent->obj_id, parent->variant_type); |
| 227 | } else { |
| 228 | yaffs_trace(YAFFS_TRACE_OS, |
| 229 | "yaffs_mknod: could not get parent object"); |
| 230 | return -EPERM; |
| 231 | } |
| 232 | |
| 233 | yaffs_trace(YAFFS_TRACE_OS, |
| 234 | "yaffs_mknod: making oject for %s, mode %x dev %x", |
| 235 | dentry->d_name.name, mode, rdev); |
| 236 | |
| 237 | dev = parent->my_dev; |
| 238 | |
| 239 | yaffs_gross_lock(dev); |
| 240 | |
| 241 | switch (mode & S_IFMT) { |
| 242 | default: |
| 243 | /* Special (socket, fifo, device...) */ |
| 244 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special"); |
| 245 | obj = |
| 246 | yaffs_create_special(parent, dentry->d_name.name, mode, uid, |
| 247 | gid, old_encode_dev(rdev)); |
| 248 | break; |
| 249 | case S_IFREG: /* file */ |
| 250 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file"); |
| 251 | obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid, |
| 252 | gid); |
| 253 | break; |
| 254 | case S_IFDIR: /* directory */ |
| 255 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory"); |
| 256 | obj = yaffs_create_dir(parent, dentry->d_name.name, mode, |
| 257 | uid, gid); |
| 258 | break; |
| 259 | case S_IFLNK: /* symlink */ |
| 260 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink"); |
| 261 | obj = NULL; /* Do we ever get here? */ |
| 262 | break; |
| 263 | } |
| 264 | |
| 265 | /* Can not call yaffs_get_inode() with gross lock held */ |
| 266 | yaffs_gross_unlock(dev); |
| 267 | |
| 268 | if (obj) { |
| 269 | inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj); |
| 270 | d_instantiate(dentry, inode); |
| 271 | update_dir_time(dir); |
| 272 | yaffs_trace(YAFFS_TRACE_OS, |
| 273 | "yaffs_mknod created object %d count = %d", |
| 274 | obj->obj_id, atomic_read(&inode->i_count)); |
| 275 | error = 0; |
| 276 | yaffs_fill_inode_from_obj(dir, parent); |
| 277 | } else { |
| 278 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object"); |
| 279 | error = -ENOMEM; |
| 280 | } |
| 281 | |
| 282 | return error; |
| 283 | } |
| 284 | |
| 285 | static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 286 | { |
| 287 | return yaffs_mknod(dir, dentry, mode | S_IFDIR, 0); |
| 288 | } |
| 289 | |
| 290 | static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, |
| 291 | struct nameidata *n) |
| 292 | { |
| 293 | return yaffs_mknod(dir, dentry, mode | S_IFREG, 0); |
| 294 | } |
| 295 | |
| 296 | static int yaffs_link(struct dentry *old_dentry, struct inode *dir, |
| 297 | struct dentry *dentry) |
| 298 | { |
| 299 | struct inode *inode = old_dentry->d_inode; |
| 300 | struct yaffs_obj *obj = NULL; |
| 301 | struct yaffs_obj *link = NULL; |
| 302 | struct yaffs_dev *dev; |
| 303 | |
| 304 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_link"); |
| 305 | |
| 306 | obj = yaffs_inode_to_obj(inode); |
| 307 | dev = obj->my_dev; |
| 308 | |
| 309 | yaffs_gross_lock(dev); |
| 310 | |
| 311 | if (!S_ISDIR(inode->i_mode)) /* Don't link directories */ |
| 312 | link = |
| 313 | yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name, |
| 314 | obj); |
| 315 | |
| 316 | if (link) { |
| 317 | old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj); |
| 318 | d_instantiate(dentry, old_dentry->d_inode); |
| 319 | atomic_inc(&old_dentry->d_inode->i_count); |
| 320 | yaffs_trace(YAFFS_TRACE_OS, |
| 321 | "yaffs_link link count %d i_count %d", |
| 322 | old_dentry->d_inode->i_nlink, |
| 323 | atomic_read(&old_dentry->d_inode->i_count)); |
| 324 | } |
| 325 | |
| 326 | yaffs_gross_unlock(dev); |
| 327 | |
| 328 | if (link) { |
| 329 | update_dir_time(dir); |
| 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | return -EPERM; |
| 334 | } |
| 335 | |
| 336 | static int yaffs_symlink(struct inode *dir, struct dentry *dentry, |
| 337 | const char *symname) |
| 338 | { |
| 339 | struct yaffs_obj *obj; |
| 340 | struct yaffs_dev *dev; |
| 341 | uid_t uid = current->cred->fsuid; |
| 342 | gid_t gid = |
| 343 | (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid; |
| 344 | |
| 345 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink"); |
| 346 | |
| 347 | dev = yaffs_inode_to_obj(dir)->my_dev; |
| 348 | yaffs_gross_lock(dev); |
| 349 | obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name, |
| 350 | S_IFLNK | S_IRWXUGO, uid, gid, symname); |
| 351 | yaffs_gross_unlock(dev); |
| 352 | |
| 353 | if (obj) { |
| 354 | struct inode *inode; |
| 355 | |
| 356 | inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); |
| 357 | d_instantiate(dentry, inode); |
| 358 | update_dir_time(dir); |
| 359 | yaffs_trace(YAFFS_TRACE_OS, "symlink created OK"); |
| 360 | return 0; |
| 361 | } else { |
| 362 | yaffs_trace(YAFFS_TRACE_OS, "symlink not created"); |
| 363 | } |
| 364 | |
| 365 | return -ENOMEM; |
| 366 | } |
| 367 | |
| 368 | static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, |
| 369 | struct nameidata *n) |
| 370 | { |
| 371 | struct yaffs_obj *obj; |
| 372 | struct inode *inode = NULL; |
| 373 | |
| 374 | struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev; |
| 375 | |
| 376 | if (current != yaffs_dev_to_lc(dev)->readdir_process) |
| 377 | yaffs_gross_lock(dev); |
| 378 | |
| 379 | yaffs_trace(YAFFS_TRACE_OS, |
| 380 | "yaffs_lookup for %d:%s", |
| 381 | yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name); |
| 382 | |
| 383 | obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name); |
| 384 | |
| 385 | obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */ |
| 386 | |
| 387 | /* Can't hold gross lock when calling yaffs_get_inode() */ |
| 388 | if (current != yaffs_dev_to_lc(dev)->readdir_process) |
| 389 | yaffs_gross_unlock(dev); |
| 390 | |
| 391 | if (obj) { |
| 392 | yaffs_trace(YAFFS_TRACE_OS, |
| 393 | "yaffs_lookup found %d", obj->obj_id); |
| 394 | |
| 395 | inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); |
| 396 | |
| 397 | if (inode) { |
| 398 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_loookup dentry"); |
| 399 | d_add(dentry, inode); |
| 400 | /* return dentry; */ |
| 401 | return NULL; |
| 402 | } |
| 403 | |
| 404 | } else { |
| 405 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found"); |
| 406 | |
| 407 | } |
| 408 | |
| 409 | d_add(dentry, inode); |
| 410 | |
| 411 | return NULL; |
| 412 | } |
| 413 | |
| 414 | static int yaffs_unlink(struct inode *dir, struct dentry *dentry) |
| 415 | { |
| 416 | int ret_val; |
| 417 | |
| 418 | struct yaffs_dev *dev; |
| 419 | struct yaffs_obj *obj; |
| 420 | |
| 421 | yaffs_trace(YAFFS_TRACE_OS, |
| 422 | "yaffs_unlink %d:%s", |
| 423 | (int)(dir->i_ino), dentry->d_name.name); |
| 424 | obj = yaffs_inode_to_obj(dir); |
| 425 | dev = obj->my_dev; |
| 426 | |
| 427 | yaffs_gross_lock(dev); |
| 428 | |
| 429 | ret_val = yaffs_unlinker(obj, dentry->d_name.name); |
| 430 | |
| 431 | if (ret_val == YAFFS_OK) { |
| 432 | dentry->d_inode->i_nlink--; |
| 433 | dir->i_version++; |
| 434 | yaffs_gross_unlock(dev); |
| 435 | mark_inode_dirty(dentry->d_inode); |
| 436 | update_dir_time(dir); |
| 437 | return 0; |
| 438 | } |
| 439 | yaffs_gross_unlock(dev); |
| 440 | return -ENOTEMPTY; |
| 441 | } |
| 442 | |
| 443 | static int yaffs_sync_object(struct file *file, int datasync) |
| 444 | { |
| 445 | |
| 446 | struct yaffs_obj *obj; |
| 447 | struct yaffs_dev *dev; |
| 448 | struct dentry *dentry = file->f_path.dentry; |
| 449 | |
| 450 | obj = yaffs_dentry_to_obj(dentry); |
| 451 | |
| 452 | dev = obj->my_dev; |
| 453 | |
| 454 | yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, "yaffs_sync_object"); |
| 455 | yaffs_gross_lock(dev); |
| 456 | yaffs_flush_file(obj, 1, datasync); |
| 457 | yaffs_gross_unlock(dev); |
| 458 | return 0; |
| 459 | } |
| 460 | /* |
| 461 | * The VFS layer already does all the dentry stuff for rename. |
| 462 | * |
| 463 | * NB: POSIX says you can rename an object over an old object of the same name |
| 464 | */ |
| 465 | static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 466 | struct inode *new_dir, struct dentry *new_dentry) |
| 467 | { |
| 468 | struct yaffs_dev *dev; |
| 469 | int ret_val = YAFFS_FAIL; |
| 470 | struct yaffs_obj *target; |
| 471 | |
| 472 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename"); |
| 473 | dev = yaffs_inode_to_obj(old_dir)->my_dev; |
| 474 | |
| 475 | yaffs_gross_lock(dev); |
| 476 | |
| 477 | /* Check if the target is an existing directory that is not empty. */ |
| 478 | target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir), |
| 479 | new_dentry->d_name.name); |
| 480 | |
| 481 | if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY && |
| 482 | !list_empty(&target->variant.dir_variant.children)) { |
| 483 | |
| 484 | yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir"); |
| 485 | |
| 486 | ret_val = YAFFS_FAIL; |
| 487 | } else { |
| 488 | /* Now does unlinking internally using shadowing mechanism */ |
| 489 | yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj"); |
| 490 | |
| 491 | ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir), |
| 492 | old_dentry->d_name.name, |
| 493 | yaffs_inode_to_obj(new_dir), |
| 494 | new_dentry->d_name.name); |
| 495 | } |
| 496 | yaffs_gross_unlock(dev); |
| 497 | |
| 498 | if (ret_val == YAFFS_OK) { |
| 499 | if (target) { |
| 500 | new_dentry->d_inode->i_nlink--; |
| 501 | mark_inode_dirty(new_dentry->d_inode); |
| 502 | } |
| 503 | |
| 504 | update_dir_time(old_dir); |
| 505 | if (old_dir != new_dir) |
| 506 | update_dir_time(new_dir); |
| 507 | return 0; |
| 508 | } else { |
| 509 | return -ENOTEMPTY; |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | static int yaffs_setattr(struct dentry *dentry, struct iattr *attr) |
| 514 | { |
| 515 | struct inode *inode = dentry->d_inode; |
| 516 | int error = 0; |
| 517 | struct yaffs_dev *dev; |
| 518 | |
| 519 | yaffs_trace(YAFFS_TRACE_OS, |
| 520 | "yaffs_setattr of object %d", |
| 521 | yaffs_inode_to_obj(inode)->obj_id); |
| 522 | |
| 523 | /* Fail if a requested resize >= 2GB */ |
| 524 | if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31)) |
| 525 | error = -EINVAL; |
| 526 | |
| 527 | if (error == 0) |
| 528 | error = inode_change_ok(inode, attr); |
| 529 | if (error == 0) { |
| 530 | int result; |
| 531 | if (!error) { |
| 532 | setattr_copy(inode, attr); |
| 533 | yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called"); |
| 534 | if (attr->ia_valid & ATTR_SIZE) { |
| 535 | truncate_setsize(inode, attr->ia_size); |
| 536 | inode->i_blocks = (inode->i_size + 511) >> 9; |
| 537 | } |
| 538 | } |
| 539 | dev = yaffs_inode_to_obj(inode)->my_dev; |
| 540 | if (attr->ia_valid & ATTR_SIZE) { |
| 541 | yaffs_trace(YAFFS_TRACE_OS, "resize to %d(%x)", |
| 542 | (int)(attr->ia_size), |
| 543 | (int)(attr->ia_size)); |
| 544 | } |
| 545 | yaffs_gross_lock(dev); |
| 546 | result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr); |
| 547 | if (result == YAFFS_OK) { |
| 548 | error = 0; |
| 549 | } else { |
| 550 | error = -EPERM; |
| 551 | } |
| 552 | yaffs_gross_unlock(dev); |
| 553 | |
| 554 | } |
| 555 | |
| 556 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error); |
| 557 | |
| 558 | return error; |
| 559 | } |
| 560 | |
| 561 | #ifdef CONFIG_YAFFS_XATTR |
| 562 | static int yaffs_setxattr(struct dentry *dentry, const char *name, |
| 563 | const void *value, size_t size, int flags) |
| 564 | { |
| 565 | struct inode *inode = dentry->d_inode; |
| 566 | int error = 0; |
| 567 | struct yaffs_dev *dev; |
| 568 | struct yaffs_obj *obj = yaffs_inode_to_obj(inode); |
| 569 | |
| 570 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id); |
| 571 | |
| 572 | if (error == 0) { |
| 573 | int result; |
| 574 | dev = obj->my_dev; |
| 575 | yaffs_gross_lock(dev); |
| 576 | result = yaffs_set_xattrib(obj, name, value, size, flags); |
| 577 | if (result == YAFFS_OK) |
| 578 | error = 0; |
| 579 | else if (result < 0) |
| 580 | error = result; |
| 581 | yaffs_gross_unlock(dev); |
| 582 | |
| 583 | } |
| 584 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error); |
| 585 | |
| 586 | return error; |
| 587 | } |
| 588 | |
| 589 | static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name, void *buff, |
| 590 | size_t size) |
| 591 | { |
| 592 | struct inode *inode = dentry->d_inode; |
| 593 | int error = 0; |
| 594 | struct yaffs_dev *dev; |
| 595 | struct yaffs_obj *obj = yaffs_inode_to_obj(inode); |
| 596 | |
| 597 | yaffs_trace(YAFFS_TRACE_OS, |
| 598 | "yaffs_getxattr \"%s\" from object %d", |
| 599 | name, obj->obj_id); |
| 600 | |
| 601 | if (error == 0) { |
| 602 | dev = obj->my_dev; |
| 603 | yaffs_gross_lock(dev); |
| 604 | error = yaffs_get_xattrib(obj, name, buff, size); |
| 605 | yaffs_gross_unlock(dev); |
| 606 | |
| 607 | } |
| 608 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error); |
| 609 | |
| 610 | return error; |
| 611 | } |
| 612 | |
| 613 | static int yaffs_removexattr(struct dentry *dentry, const char *name) |
| 614 | { |
| 615 | struct inode *inode = dentry->d_inode; |
| 616 | int error = 0; |
| 617 | struct yaffs_dev *dev; |
| 618 | struct yaffs_obj *obj = yaffs_inode_to_obj(inode); |
| 619 | |
| 620 | yaffs_trace(YAFFS_TRACE_OS, |
| 621 | "yaffs_removexattr of object %d", obj->obj_id); |
| 622 | |
| 623 | if (error == 0) { |
| 624 | int result; |
| 625 | dev = obj->my_dev; |
| 626 | yaffs_gross_lock(dev); |
| 627 | result = yaffs_remove_xattrib(obj, name); |
| 628 | if (result == YAFFS_OK) |
| 629 | error = 0; |
| 630 | else if (result < 0) |
| 631 | error = result; |
| 632 | yaffs_gross_unlock(dev); |
| 633 | |
| 634 | } |
| 635 | yaffs_trace(YAFFS_TRACE_OS, |
| 636 | "yaffs_removexattr done returning %d", error); |
| 637 | |
| 638 | return error; |
| 639 | } |
| 640 | |
| 641 | static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size) |
| 642 | { |
| 643 | struct inode *inode = dentry->d_inode; |
| 644 | int error = 0; |
| 645 | struct yaffs_dev *dev; |
| 646 | struct yaffs_obj *obj = yaffs_inode_to_obj(inode); |
| 647 | |
| 648 | yaffs_trace(YAFFS_TRACE_OS, |
| 649 | "yaffs_listxattr of object %d", obj->obj_id); |
| 650 | |
| 651 | if (error == 0) { |
| 652 | dev = obj->my_dev; |
| 653 | yaffs_gross_lock(dev); |
| 654 | error = yaffs_list_xattrib(obj, buff, size); |
| 655 | yaffs_gross_unlock(dev); |
| 656 | |
| 657 | } |
| 658 | yaffs_trace(YAFFS_TRACE_OS, |
| 659 | "yaffs_listxattr done returning %d", error); |
| 660 | |
| 661 | return error; |
| 662 | } |
| 663 | |
| 664 | #endif |
| 665 | |
| 666 | static const struct inode_operations yaffs_dir_inode_operations = { |
| 667 | .create = yaffs_create, |
| 668 | .lookup = yaffs_lookup, |
| 669 | .link = yaffs_link, |
| 670 | .unlink = yaffs_unlink, |
| 671 | .symlink = yaffs_symlink, |
| 672 | .mkdir = yaffs_mkdir, |
| 673 | .rmdir = yaffs_unlink, |
| 674 | .mknod = yaffs_mknod, |
| 675 | .rename = yaffs_rename, |
| 676 | .setattr = yaffs_setattr, |
| 677 | #ifdef CONFIG_YAFFS_XATTR |
| 678 | .setxattr = yaffs_setxattr, |
| 679 | .getxattr = yaffs_getxattr, |
| 680 | .listxattr = yaffs_listxattr, |
| 681 | .removexattr = yaffs_removexattr, |
| 682 | #endif |
| 683 | }; |
| 684 | /*-----------------------------------------------------------------*/ |
| 685 | /* Directory search context allows us to unlock access to yaffs during |
| 686 | * filldir without causing problems with the directory being modified. |
| 687 | * This is similar to the tried and tested mechanism used in yaffs direct. |
| 688 | * |
| 689 | * A search context iterates along a doubly linked list of siblings in the |
| 690 | * directory. If the iterating object is deleted then this would corrupt |
| 691 | * the list iteration, likely causing a crash. The search context avoids |
| 692 | * this by using the remove_obj_fn to move the search context to the |
| 693 | * next object before the object is deleted. |
| 694 | * |
| 695 | * Many readdirs (and thus seach conexts) may be alive simulateously so |
| 696 | * each struct yaffs_dev has a list of these. |
| 697 | * |
| 698 | * A seach context lives for the duration of a readdir. |
| 699 | * |
| 700 | * All these functions must be called while yaffs is locked. |
| 701 | */ |
| 702 | |
| 703 | struct yaffs_search_context { |
| 704 | struct yaffs_dev *dev; |
| 705 | struct yaffs_obj *dir_obj; |
| 706 | struct yaffs_obj *next_return; |
| 707 | struct list_head others; |
| 708 | }; |
| 709 | |
| 710 | /* |
| 711 | * yaffs_new_search() creates a new search context, initialises it and |
| 712 | * adds it to the device's search context list. |
| 713 | * |
| 714 | * Called at start of readdir. |
| 715 | */ |
| 716 | static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir) |
| 717 | { |
| 718 | struct yaffs_dev *dev = dir->my_dev; |
| 719 | struct yaffs_search_context *sc = |
| 720 | kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS); |
| 721 | if (sc) { |
| 722 | sc->dir_obj = dir; |
| 723 | sc->dev = dev; |
| 724 | if (list_empty(&sc->dir_obj->variant.dir_variant.children)) |
| 725 | sc->next_return = NULL; |
| 726 | else |
| 727 | sc->next_return = |
| 728 | list_entry(dir->variant.dir_variant.children.next, |
| 729 | struct yaffs_obj, siblings); |
| 730 | INIT_LIST_HEAD(&sc->others); |
| 731 | list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts)); |
| 732 | } |
| 733 | return sc; |
| 734 | } |
| 735 | |
| 736 | /* |
| 737 | * yaffs_search_end() disposes of a search context and cleans up. |
| 738 | */ |
| 739 | static void yaffs_search_end(struct yaffs_search_context *sc) |
| 740 | { |
| 741 | if (sc) { |
| 742 | list_del(&sc->others); |
| 743 | kfree(sc); |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | /* |
| 748 | * yaffs_search_advance() moves a search context to the next object. |
| 749 | * Called when the search iterates or when an object removal causes |
| 750 | * the search context to be moved to the next object. |
| 751 | */ |
| 752 | static void yaffs_search_advance(struct yaffs_search_context *sc) |
| 753 | { |
| 754 | if (!sc) |
| 755 | return; |
| 756 | |
| 757 | if (sc->next_return == NULL || |
| 758 | list_empty(&sc->dir_obj->variant.dir_variant.children)) |
| 759 | sc->next_return = NULL; |
| 760 | else { |
| 761 | struct list_head *next = sc->next_return->siblings.next; |
| 762 | |
| 763 | if (next == &sc->dir_obj->variant.dir_variant.children) |
| 764 | sc->next_return = NULL; /* end of list */ |
| 765 | else |
| 766 | sc->next_return = |
| 767 | list_entry(next, struct yaffs_obj, siblings); |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | /* |
| 772 | * yaffs_remove_obj_callback() is called when an object is unlinked. |
| 773 | * We check open search contexts and advance any which are currently |
| 774 | * on the object being iterated. |
| 775 | */ |
| 776 | static void yaffs_remove_obj_callback(struct yaffs_obj *obj) |
| 777 | { |
| 778 | |
| 779 | struct list_head *i; |
| 780 | struct yaffs_search_context *sc; |
| 781 | struct list_head *search_contexts = |
| 782 | &(yaffs_dev_to_lc(obj->my_dev)->search_contexts); |
| 783 | |
| 784 | /* Iterate through the directory search contexts. |
| 785 | * If any are currently on the object being removed, then advance |
| 786 | * the search context to the next object to prevent a hanging pointer. |
| 787 | */ |
| 788 | list_for_each(i, search_contexts) { |
| 789 | if (i) { |
| 790 | sc = list_entry(i, struct yaffs_search_context, others); |
| 791 | if (sc->next_return == obj) |
| 792 | yaffs_search_advance(sc); |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | } |
| 797 | |
| 798 | static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) |
| 799 | { |
| 800 | struct yaffs_obj *obj; |
| 801 | struct yaffs_dev *dev; |
| 802 | struct yaffs_search_context *sc; |
| 803 | struct inode *inode = f->f_dentry->d_inode; |
| 804 | unsigned long offset, curoffs; |
| 805 | struct yaffs_obj *l; |
| 806 | int ret_val = 0; |
| 807 | |
| 808 | char name[YAFFS_MAX_NAME_LENGTH + 1]; |
| 809 | |
| 810 | obj = yaffs_dentry_to_obj(f->f_dentry); |
| 811 | dev = obj->my_dev; |
| 812 | |
| 813 | yaffs_gross_lock(dev); |
| 814 | |
| 815 | yaffs_dev_to_lc(dev)->readdir_process = current; |
| 816 | |
| 817 | offset = f->f_pos; |
| 818 | |
| 819 | sc = yaffs_new_search(obj); |
| 820 | if (!sc) { |
| 821 | ret_val = -ENOMEM; |
| 822 | goto out; |
| 823 | } |
| 824 | |
| 825 | yaffs_trace(YAFFS_TRACE_OS, |
| 826 | "yaffs_readdir: starting at %d", (int)offset); |
| 827 | |
| 828 | if (offset == 0) { |
| 829 | yaffs_trace(YAFFS_TRACE_OS, |
| 830 | "yaffs_readdir: entry . ino %d", |
| 831 | (int)inode->i_ino); |
| 832 | yaffs_gross_unlock(dev); |
| 833 | if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) { |
| 834 | yaffs_gross_lock(dev); |
| 835 | goto out; |
| 836 | } |
| 837 | yaffs_gross_lock(dev); |
| 838 | offset++; |
| 839 | f->f_pos++; |
| 840 | } |
| 841 | if (offset == 1) { |
| 842 | yaffs_trace(YAFFS_TRACE_OS, |
| 843 | "yaffs_readdir: entry .. ino %d", |
| 844 | (int)f->f_dentry->d_parent->d_inode->i_ino); |
| 845 | yaffs_gross_unlock(dev); |
| 846 | if (filldir(dirent, "..", 2, offset, |
| 847 | f->f_dentry->d_parent->d_inode->i_ino, |
| 848 | DT_DIR) < 0) { |
| 849 | yaffs_gross_lock(dev); |
| 850 | goto out; |
| 851 | } |
| 852 | yaffs_gross_lock(dev); |
| 853 | offset++; |
| 854 | f->f_pos++; |
| 855 | } |
| 856 | |
| 857 | curoffs = 1; |
| 858 | |
| 859 | /* If the directory has changed since the open or last call to |
| 860 | readdir, rewind to after the 2 canned entries. */ |
| 861 | if (f->f_version != inode->i_version) { |
| 862 | offset = 2; |
| 863 | f->f_pos = offset; |
| 864 | f->f_version = inode->i_version; |
| 865 | } |
| 866 | |
| 867 | while (sc->next_return) { |
| 868 | curoffs++; |
| 869 | l = sc->next_return; |
| 870 | if (curoffs >= offset) { |
| 871 | int this_inode = yaffs_get_obj_inode(l); |
| 872 | int this_type = yaffs_get_obj_type(l); |
| 873 | |
| 874 | yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1); |
| 875 | yaffs_trace(YAFFS_TRACE_OS, |
| 876 | "yaffs_readdir: %s inode %d", |
| 877 | name, yaffs_get_obj_inode(l)); |
| 878 | |
| 879 | yaffs_gross_unlock(dev); |
| 880 | |
| 881 | if (filldir(dirent, |
| 882 | name, |
| 883 | strlen(name), |
| 884 | offset, this_inode, this_type) < 0) { |
| 885 | yaffs_gross_lock(dev); |
| 886 | goto out; |
| 887 | } |
| 888 | |
| 889 | yaffs_gross_lock(dev); |
| 890 | |
| 891 | offset++; |
| 892 | f->f_pos++; |
| 893 | } |
| 894 | yaffs_search_advance(sc); |
| 895 | } |
| 896 | |
| 897 | out: |
| 898 | yaffs_search_end(sc); |
| 899 | yaffs_dev_to_lc(dev)->readdir_process = NULL; |
| 900 | yaffs_gross_unlock(dev); |
| 901 | |
| 902 | return ret_val; |
| 903 | } |
| 904 | |
| 905 | static const struct file_operations yaffs_dir_operations = { |
| 906 | .read = generic_read_dir, |
| 907 | .readdir = yaffs_readdir, |
| 908 | .fsync = yaffs_sync_object, |
| 909 | .llseek = generic_file_llseek, |
| 910 | }; |
| 911 | |
| 912 | |
| 913 | |
| 914 | static int yaffs_file_flush(struct file *file, fl_owner_t id) |
| 915 | { |
| 916 | struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry); |
| 917 | |
| 918 | struct yaffs_dev *dev = obj->my_dev; |
| 919 | |
| 920 | yaffs_trace(YAFFS_TRACE_OS, |
| 921 | "yaffs_file_flush object %d (%s)", |
| 922 | obj->obj_id, obj->dirty ? "dirty" : "clean"); |
| 923 | |
| 924 | yaffs_gross_lock(dev); |
| 925 | |
| 926 | yaffs_flush_file(obj, 1, 0); |
| 927 | |
| 928 | yaffs_gross_unlock(dev); |
| 929 | |
| 930 | return 0; |
| 931 | } |
| 932 | |
| 933 | static const struct file_operations yaffs_file_operations = { |
| 934 | .read = do_sync_read, |
| 935 | .write = do_sync_write, |
| 936 | .aio_read = generic_file_aio_read, |
| 937 | .aio_write = generic_file_aio_write, |
| 938 | .mmap = generic_file_mmap, |
| 939 | .flush = yaffs_file_flush, |
| 940 | .fsync = yaffs_sync_object, |
| 941 | .splice_read = generic_file_splice_read, |
| 942 | .splice_write = generic_file_splice_write, |
| 943 | .llseek = generic_file_llseek, |
| 944 | }; |
| 945 | |
| 946 | |
| 947 | /* ExportFS support */ |
| 948 | static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, |
| 949 | uint32_t generation) |
| 950 | { |
| 951 | return yaffs_iget(sb, ino); |
| 952 | } |
| 953 | |
| 954 | static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb, |
| 955 | struct fid *fid, int fh_len, |
| 956 | int fh_type) |
| 957 | { |
| 958 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 959 | yaffs2_nfs_get_inode); |
| 960 | } |
| 961 | |
| 962 | static struct dentry *yaffs2_fh_to_parent(struct super_block *sb, |
| 963 | struct fid *fid, int fh_len, |
| 964 | int fh_type) |
| 965 | { |
| 966 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 967 | yaffs2_nfs_get_inode); |
| 968 | } |
| 969 | |
| 970 | struct dentry *yaffs2_get_parent(struct dentry *dentry) |
| 971 | { |
| 972 | |
| 973 | struct super_block *sb = dentry->d_inode->i_sb; |
| 974 | struct dentry *parent = ERR_PTR(-ENOENT); |
| 975 | struct inode *inode; |
| 976 | unsigned long parent_ino; |
| 977 | struct yaffs_obj *d_obj; |
| 978 | struct yaffs_obj *parent_obj; |
| 979 | |
| 980 | d_obj = yaffs_inode_to_obj(dentry->d_inode); |
| 981 | |
| 982 | if (d_obj) { |
| 983 | parent_obj = d_obj->parent; |
| 984 | if (parent_obj) { |
| 985 | parent_ino = yaffs_get_obj_inode(parent_obj); |
| 986 | inode = yaffs_iget(sb, parent_ino); |
| 987 | |
| 988 | if (IS_ERR(inode)) { |
| 989 | parent = ERR_CAST(inode); |
| 990 | } else { |
| 991 | parent = d_obtain_alias(inode); |
| 992 | if (!IS_ERR(parent)) { |
| 993 | parent = ERR_PTR(-ENOMEM); |
| 994 | iput(inode); |
| 995 | } |
| 996 | } |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | return parent; |
| 1001 | } |
| 1002 | |
| 1003 | /* Just declare a zero structure as a NULL value implies |
| 1004 | * using the default functions of exportfs. |
| 1005 | */ |
| 1006 | |
| 1007 | static struct export_operations yaffs_export_ops = { |
| 1008 | .fh_to_dentry = yaffs2_fh_to_dentry, |
| 1009 | .fh_to_parent = yaffs2_fh_to_parent, |
| 1010 | .get_parent = yaffs2_get_parent, |
| 1011 | }; |
| 1012 | |
| 1013 | |
| 1014 | /*-----------------------------------------------------------------*/ |
| 1015 | |
| 1016 | static int yaffs_readlink(struct dentry *dentry, char __user * buffer, |
| 1017 | int buflen) |
| 1018 | { |
| 1019 | unsigned char *alias; |
| 1020 | int ret; |
| 1021 | |
| 1022 | struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev; |
| 1023 | |
| 1024 | yaffs_gross_lock(dev); |
| 1025 | |
| 1026 | alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry)); |
| 1027 | |
| 1028 | yaffs_gross_unlock(dev); |
| 1029 | |
| 1030 | if (!alias) |
| 1031 | return -ENOMEM; |
| 1032 | |
| 1033 | ret = vfs_readlink(dentry, buffer, buflen, alias); |
| 1034 | kfree(alias); |
| 1035 | return ret; |
| 1036 | } |
| 1037 | |
| 1038 | static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd) |
| 1039 | { |
| 1040 | unsigned char *alias; |
| 1041 | void *ret; |
| 1042 | struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev; |
| 1043 | |
| 1044 | yaffs_gross_lock(dev); |
| 1045 | |
| 1046 | alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry)); |
| 1047 | yaffs_gross_unlock(dev); |
| 1048 | |
| 1049 | if (!alias) { |
| 1050 | ret = ERR_PTR(-ENOMEM); |
| 1051 | goto out; |
| 1052 | } |
| 1053 | |
| 1054 | nd_set_link(nd, alias); |
| 1055 | ret = (void *)alias; |
| 1056 | out: |
| 1057 | return ret; |
| 1058 | } |
| 1059 | |
| 1060 | void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) |
| 1061 | { |
| 1062 | kfree(alias); |
| 1063 | } |
| 1064 | |
| 1065 | |
| 1066 | static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj) |
| 1067 | { |
| 1068 | /* Clear the association between the inode and |
| 1069 | * the struct yaffs_obj. |
| 1070 | */ |
| 1071 | obj->my_inode = NULL; |
| 1072 | yaffs_inode_to_obj_lv(inode) = NULL; |
| 1073 | |
| 1074 | /* If the object freeing was deferred, then the real |
| 1075 | * free happens now. |
| 1076 | * This should fix the inode inconsistency problem. |
| 1077 | */ |
| 1078 | yaffs_handle_defered_free(obj); |
| 1079 | } |
| 1080 | |
| 1081 | /* yaffs_evict_inode combines into one operation what was previously done in |
| 1082 | * yaffs_clear_inode() and yaffs_delete_inode() |
| 1083 | * |
| 1084 | */ |
| 1085 | static void yaffs_evict_inode(struct inode *inode) |
| 1086 | { |
| 1087 | struct yaffs_obj *obj; |
| 1088 | struct yaffs_dev *dev; |
| 1089 | int deleteme = 0; |
| 1090 | |
| 1091 | obj = yaffs_inode_to_obj(inode); |
| 1092 | |
| 1093 | yaffs_trace(YAFFS_TRACE_OS, |
| 1094 | "yaffs_evict_inode: ino %d, count %d %s", |
| 1095 | (int)inode->i_ino, |
| 1096 | atomic_read(&inode->i_count), |
| 1097 | obj ? "object exists" : "null object"); |
| 1098 | |
| 1099 | if (!inode->i_nlink && !is_bad_inode(inode)) |
| 1100 | deleteme = 1; |
| 1101 | truncate_inode_pages(&inode->i_data, 0); |
| 1102 | end_writeback(inode); |
| 1103 | |
| 1104 | if (deleteme && obj) { |
| 1105 | dev = obj->my_dev; |
| 1106 | yaffs_gross_lock(dev); |
| 1107 | yaffs_del_obj(obj); |
| 1108 | yaffs_gross_unlock(dev); |
| 1109 | } |
| 1110 | if (obj) { |
| 1111 | dev = obj->my_dev; |
| 1112 | yaffs_gross_lock(dev); |
| 1113 | yaffs_unstitch_obj(inode, obj); |
| 1114 | yaffs_gross_unlock(dev); |
| 1115 | } |
| 1116 | |
| 1117 | } |
| 1118 | |
| 1119 | static void yaffs_touch_super(struct yaffs_dev *dev) |
| 1120 | { |
| 1121 | struct super_block *sb = yaffs_dev_to_lc(dev)->super; |
| 1122 | |
| 1123 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb); |
| 1124 | if (sb) |
| 1125 | sb->s_dirt = 1; |
| 1126 | } |
| 1127 | |
| 1128 | static int yaffs_readpage_nolock(struct file *f, struct page *pg) |
| 1129 | { |
| 1130 | /* Lifted from jffs2 */ |
| 1131 | |
| 1132 | struct yaffs_obj *obj; |
| 1133 | unsigned char *pg_buf; |
| 1134 | int ret; |
| 1135 | |
| 1136 | struct yaffs_dev *dev; |
| 1137 | |
| 1138 | yaffs_trace(YAFFS_TRACE_OS, |
| 1139 | "yaffs_readpage_nolock at %08x, size %08x", |
| 1140 | (unsigned)(pg->index << PAGE_CACHE_SHIFT), |
| 1141 | (unsigned)PAGE_CACHE_SIZE); |
| 1142 | |
| 1143 | obj = yaffs_dentry_to_obj(f->f_dentry); |
| 1144 | |
| 1145 | dev = obj->my_dev; |
| 1146 | |
| 1147 | BUG_ON(!PageLocked(pg)); |
| 1148 | |
| 1149 | pg_buf = kmap(pg); |
| 1150 | /* FIXME: Can kmap fail? */ |
| 1151 | |
| 1152 | yaffs_gross_lock(dev); |
| 1153 | |
| 1154 | ret = yaffs_file_rd(obj, pg_buf, |
| 1155 | pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); |
| 1156 | |
| 1157 | yaffs_gross_unlock(dev); |
| 1158 | |
| 1159 | if (ret >= 0) |
| 1160 | ret = 0; |
| 1161 | |
| 1162 | if (ret) { |
| 1163 | ClearPageUptodate(pg); |
| 1164 | SetPageError(pg); |
| 1165 | } else { |
| 1166 | SetPageUptodate(pg); |
| 1167 | ClearPageError(pg); |
| 1168 | } |
| 1169 | |
| 1170 | flush_dcache_page(pg); |
| 1171 | kunmap(pg); |
| 1172 | |
| 1173 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done"); |
| 1174 | return ret; |
| 1175 | } |
| 1176 | |
| 1177 | static int yaffs_readpage_unlock(struct file *f, struct page *pg) |
| 1178 | { |
| 1179 | int ret = yaffs_readpage_nolock(f, pg); |
| 1180 | UnlockPage(pg); |
| 1181 | return ret; |
| 1182 | } |
| 1183 | |
| 1184 | static int yaffs_readpage(struct file *f, struct page *pg) |
| 1185 | { |
| 1186 | int ret; |
| 1187 | |
| 1188 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage"); |
| 1189 | ret = yaffs_readpage_unlock(f, pg); |
| 1190 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done"); |
| 1191 | return ret; |
| 1192 | } |
| 1193 | |
| 1194 | /* writepage inspired by/stolen from smbfs */ |
| 1195 | |
| 1196 | static int yaffs_writepage(struct page *page, struct writeback_control *wbc) |
| 1197 | { |
| 1198 | struct yaffs_dev *dev; |
| 1199 | struct address_space *mapping = page->mapping; |
| 1200 | struct inode *inode; |
| 1201 | unsigned long end_index; |
| 1202 | char *buffer; |
| 1203 | struct yaffs_obj *obj; |
| 1204 | int n_written = 0; |
| 1205 | unsigned n_bytes; |
| 1206 | loff_t i_size; |
| 1207 | |
| 1208 | if (!mapping) |
| 1209 | BUG(); |
| 1210 | inode = mapping->host; |
| 1211 | if (!inode) |
| 1212 | BUG(); |
| 1213 | i_size = i_size_read(inode); |
| 1214 | |
| 1215 | end_index = i_size >> PAGE_CACHE_SHIFT; |
| 1216 | |
| 1217 | if (page->index < end_index) |
| 1218 | n_bytes = PAGE_CACHE_SIZE; |
| 1219 | else { |
| 1220 | n_bytes = i_size & (PAGE_CACHE_SIZE - 1); |
| 1221 | |
| 1222 | if (page->index > end_index || !n_bytes) { |
| 1223 | yaffs_trace(YAFFS_TRACE_OS, |
| 1224 | "yaffs_writepage at %08x, inode size = %08x!!!", |
| 1225 | (unsigned)(page->index << PAGE_CACHE_SHIFT), |
| 1226 | (unsigned)inode->i_size); |
| 1227 | yaffs_trace(YAFFS_TRACE_OS, |
| 1228 | " -> don't care!!"); |
| 1229 | |
| 1230 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); |
| 1231 | set_page_writeback(page); |
| 1232 | unlock_page(page); |
| 1233 | end_page_writeback(page); |
| 1234 | return 0; |
| 1235 | } |
| 1236 | } |
| 1237 | |
| 1238 | if (n_bytes != PAGE_CACHE_SIZE) |
| 1239 | zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE); |
| 1240 | |
| 1241 | get_page(page); |
| 1242 | |
| 1243 | buffer = kmap(page); |
| 1244 | |
| 1245 | obj = yaffs_inode_to_obj(inode); |
| 1246 | dev = obj->my_dev; |
| 1247 | yaffs_gross_lock(dev); |
| 1248 | |
| 1249 | yaffs_trace(YAFFS_TRACE_OS, |
| 1250 | "yaffs_writepage at %08x, size %08x", |
| 1251 | (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes); |
| 1252 | yaffs_trace(YAFFS_TRACE_OS, |
| 1253 | "writepag0: obj = %05x, ino = %05x", |
| 1254 | (int)obj->variant.file_variant.file_size, (int)inode->i_size); |
| 1255 | |
| 1256 | n_written = yaffs_wr_file(obj, buffer, |
| 1257 | page->index << PAGE_CACHE_SHIFT, n_bytes, 0); |
| 1258 | |
| 1259 | yaffs_touch_super(dev); |
| 1260 | |
| 1261 | yaffs_trace(YAFFS_TRACE_OS, |
| 1262 | "writepag1: obj = %05x, ino = %05x", |
| 1263 | (int)obj->variant.file_variant.file_size, (int)inode->i_size); |
| 1264 | |
| 1265 | yaffs_gross_unlock(dev); |
| 1266 | |
| 1267 | kunmap(page); |
| 1268 | set_page_writeback(page); |
| 1269 | unlock_page(page); |
| 1270 | end_page_writeback(page); |
| 1271 | put_page(page); |
| 1272 | |
| 1273 | return (n_written == n_bytes) ? 0 : -ENOSPC; |
| 1274 | } |
| 1275 | |
| 1276 | /* Space holding and freeing is done to ensure we have space available for |
| 1277 | * write_begin/end. |
| 1278 | * For now we just assume few parallel writes and check against a small |
| 1279 | * number. |
| 1280 | * Todo: need to do this with a counter to handle parallel reads better. |
| 1281 | */ |
| 1282 | |
| 1283 | static ssize_t yaffs_hold_space(struct file *f) |
| 1284 | { |
| 1285 | struct yaffs_obj *obj; |
| 1286 | struct yaffs_dev *dev; |
| 1287 | |
| 1288 | int n_free_chunks; |
| 1289 | |
| 1290 | obj = yaffs_dentry_to_obj(f->f_dentry); |
| 1291 | |
| 1292 | dev = obj->my_dev; |
| 1293 | |
| 1294 | yaffs_gross_lock(dev); |
| 1295 | |
| 1296 | n_free_chunks = yaffs_get_n_free_chunks(dev); |
| 1297 | |
| 1298 | yaffs_gross_unlock(dev); |
| 1299 | |
| 1300 | return (n_free_chunks > 20) ? 1 : 0; |
| 1301 | } |
| 1302 | |
| 1303 | static void yaffs_release_space(struct file *f) |
| 1304 | { |
| 1305 | struct yaffs_obj *obj; |
| 1306 | struct yaffs_dev *dev; |
| 1307 | |
| 1308 | obj = yaffs_dentry_to_obj(f->f_dentry); |
| 1309 | |
| 1310 | dev = obj->my_dev; |
| 1311 | |
| 1312 | yaffs_gross_lock(dev); |
| 1313 | |
| 1314 | yaffs_gross_unlock(dev); |
| 1315 | } |
| 1316 | |
| 1317 | static int yaffs_write_begin(struct file *filp, struct address_space *mapping, |
| 1318 | loff_t pos, unsigned len, unsigned flags, |
| 1319 | struct page **pagep, void **fsdata) |
| 1320 | { |
| 1321 | struct page *pg = NULL; |
| 1322 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
| 1323 | |
| 1324 | int ret = 0; |
| 1325 | int space_held = 0; |
| 1326 | |
| 1327 | /* Get a page */ |
| 1328 | pg = grab_cache_page_write_begin(mapping, index, flags); |
| 1329 | |
| 1330 | *pagep = pg; |
| 1331 | if (!pg) { |
| 1332 | ret = -ENOMEM; |
| 1333 | goto out; |
| 1334 | } |
| 1335 | yaffs_trace(YAFFS_TRACE_OS, |
| 1336 | "start yaffs_write_begin index %d(%x) uptodate %d", |
| 1337 | (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0); |
| 1338 | |
| 1339 | /* Get fs space */ |
| 1340 | space_held = yaffs_hold_space(filp); |
| 1341 | |
| 1342 | if (!space_held) { |
| 1343 | ret = -ENOSPC; |
| 1344 | goto out; |
| 1345 | } |
| 1346 | |
| 1347 | /* Update page if required */ |
| 1348 | |
| 1349 | if (!Page_Uptodate(pg)) |
| 1350 | ret = yaffs_readpage_nolock(filp, pg); |
| 1351 | |
| 1352 | if (ret) |
| 1353 | goto out; |
| 1354 | |
| 1355 | /* Happy path return */ |
| 1356 | yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok"); |
| 1357 | |
| 1358 | return 0; |
| 1359 | |
| 1360 | out: |
| 1361 | yaffs_trace(YAFFS_TRACE_OS, |
| 1362 | "end yaffs_write_begin fail returning %d", ret); |
| 1363 | if (space_held) |
| 1364 | yaffs_release_space(filp); |
| 1365 | if (pg) { |
| 1366 | unlock_page(pg); |
| 1367 | page_cache_release(pg); |
| 1368 | } |
| 1369 | return ret; |
| 1370 | } |
| 1371 | |
| 1372 | static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, |
| 1373 | loff_t * pos) |
| 1374 | { |
| 1375 | struct yaffs_obj *obj; |
| 1376 | int n_written, ipos; |
| 1377 | struct inode *inode; |
| 1378 | struct yaffs_dev *dev; |
| 1379 | |
| 1380 | obj = yaffs_dentry_to_obj(f->f_dentry); |
| 1381 | |
| 1382 | dev = obj->my_dev; |
| 1383 | |
| 1384 | yaffs_gross_lock(dev); |
| 1385 | |
| 1386 | inode = f->f_dentry->d_inode; |
| 1387 | |
| 1388 | if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) |
| 1389 | ipos = inode->i_size; |
| 1390 | else |
| 1391 | ipos = *pos; |
| 1392 | |
| 1393 | if (!obj) |
| 1394 | yaffs_trace(YAFFS_TRACE_OS, |
| 1395 | "yaffs_file_write: hey obj is null!"); |
| 1396 | else |
| 1397 | yaffs_trace(YAFFS_TRACE_OS, |
| 1398 | "yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)", |
| 1399 | (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos); |
| 1400 | |
| 1401 | n_written = yaffs_wr_file(obj, buf, ipos, n, 0); |
| 1402 | |
| 1403 | yaffs_touch_super(dev); |
| 1404 | |
| 1405 | yaffs_trace(YAFFS_TRACE_OS, |
| 1406 | "yaffs_file_write: %d(%x) bytes written", |
| 1407 | (unsigned)n, (unsigned)n); |
| 1408 | |
| 1409 | if (n_written > 0) { |
| 1410 | ipos += n_written; |
| 1411 | *pos = ipos; |
| 1412 | if (ipos > inode->i_size) { |
| 1413 | inode->i_size = ipos; |
| 1414 | inode->i_blocks = (ipos + 511) >> 9; |
| 1415 | |
| 1416 | yaffs_trace(YAFFS_TRACE_OS, |
| 1417 | "yaffs_file_write size updated to %d bytes, %d blocks", |
| 1418 | ipos, (int)(inode->i_blocks)); |
| 1419 | } |
| 1420 | |
| 1421 | } |
| 1422 | yaffs_gross_unlock(dev); |
| 1423 | return (n_written == 0) && (n > 0) ? -ENOSPC : n_written; |
| 1424 | } |
| 1425 | |
| 1426 | static int yaffs_write_end(struct file *filp, struct address_space *mapping, |
| 1427 | loff_t pos, unsigned len, unsigned copied, |
| 1428 | struct page *pg, void *fsdadata) |
| 1429 | { |
| 1430 | int ret = 0; |
| 1431 | void *addr, *kva; |
| 1432 | uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1); |
| 1433 | |
| 1434 | kva = kmap(pg); |
| 1435 | addr = kva + offset_into_page; |
| 1436 | |
| 1437 | yaffs_trace(YAFFS_TRACE_OS, |
| 1438 | "yaffs_write_end addr %p pos %x n_bytes %d", |
| 1439 | addr, (unsigned)pos, copied); |
| 1440 | |
| 1441 | ret = yaffs_file_write(filp, addr, copied, &pos); |
| 1442 | |
| 1443 | if (ret != copied) { |
| 1444 | yaffs_trace(YAFFS_TRACE_OS, |
| 1445 | "yaffs_write_end not same size ret %d copied %d", |
| 1446 | ret, copied); |
| 1447 | SetPageError(pg); |
| 1448 | } |
| 1449 | |
| 1450 | kunmap(pg); |
| 1451 | |
| 1452 | yaffs_release_space(filp); |
| 1453 | unlock_page(pg); |
| 1454 | page_cache_release(pg); |
| 1455 | return ret; |
| 1456 | } |
| 1457 | |
| 1458 | static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 1459 | { |
| 1460 | struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev; |
| 1461 | struct super_block *sb = dentry->d_sb; |
| 1462 | |
| 1463 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs"); |
| 1464 | |
| 1465 | yaffs_gross_lock(dev); |
| 1466 | |
| 1467 | buf->f_type = YAFFS_MAGIC; |
| 1468 | buf->f_bsize = sb->s_blocksize; |
| 1469 | buf->f_namelen = 255; |
| 1470 | |
| 1471 | if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) { |
| 1472 | /* Do this if chunk size is not a power of 2 */ |
| 1473 | |
| 1474 | uint64_t bytes_in_dev; |
| 1475 | uint64_t bytes_free; |
| 1476 | |
| 1477 | bytes_in_dev = |
| 1478 | ((uint64_t) |
| 1479 | ((dev->param.end_block - dev->param.start_block + |
| 1480 | 1))) * ((uint64_t) (dev->param.chunks_per_block * |
| 1481 | dev->data_bytes_per_chunk)); |
| 1482 | |
| 1483 | do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */ |
| 1484 | buf->f_blocks = bytes_in_dev; |
| 1485 | |
| 1486 | bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) * |
| 1487 | ((uint64_t) (dev->data_bytes_per_chunk)); |
| 1488 | |
| 1489 | do_div(bytes_free, sb->s_blocksize); |
| 1490 | |
| 1491 | buf->f_bfree = bytes_free; |
| 1492 | |
| 1493 | } else if (sb->s_blocksize > dev->data_bytes_per_chunk) { |
| 1494 | |
| 1495 | buf->f_blocks = |
| 1496 | (dev->param.end_block - dev->param.start_block + 1) * |
| 1497 | dev->param.chunks_per_block / |
| 1498 | (sb->s_blocksize / dev->data_bytes_per_chunk); |
| 1499 | buf->f_bfree = |
| 1500 | yaffs_get_n_free_chunks(dev) / |
| 1501 | (sb->s_blocksize / dev->data_bytes_per_chunk); |
| 1502 | } else { |
| 1503 | buf->f_blocks = |
| 1504 | (dev->param.end_block - dev->param.start_block + 1) * |
| 1505 | dev->param.chunks_per_block * |
| 1506 | (dev->data_bytes_per_chunk / sb->s_blocksize); |
| 1507 | |
| 1508 | buf->f_bfree = |
| 1509 | yaffs_get_n_free_chunks(dev) * |
| 1510 | (dev->data_bytes_per_chunk / sb->s_blocksize); |
| 1511 | } |
| 1512 | |
| 1513 | buf->f_files = 0; |
| 1514 | buf->f_ffree = 0; |
| 1515 | buf->f_bavail = buf->f_bfree; |
| 1516 | |
| 1517 | yaffs_gross_unlock(dev); |
| 1518 | return 0; |
| 1519 | } |
| 1520 | |
| 1521 | static void yaffs_flush_inodes(struct super_block *sb) |
| 1522 | { |
| 1523 | struct inode *iptr; |
| 1524 | struct yaffs_obj *obj; |
| 1525 | |
| 1526 | list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) { |
| 1527 | obj = yaffs_inode_to_obj(iptr); |
| 1528 | if (obj) { |
| 1529 | yaffs_trace(YAFFS_TRACE_OS, |
| 1530 | "flushing obj %d", obj->obj_id); |
| 1531 | yaffs_flush_file(obj, 1, 0); |
| 1532 | } |
| 1533 | } |
| 1534 | } |
| 1535 | |
| 1536 | static void yaffs_flush_super(struct super_block *sb, int do_checkpoint) |
| 1537 | { |
| 1538 | struct yaffs_dev *dev = yaffs_super_to_dev(sb); |
| 1539 | if (!dev) |
| 1540 | return; |
| 1541 | |
| 1542 | yaffs_flush_inodes(sb); |
| 1543 | yaffs_update_dirty_dirs(dev); |
| 1544 | yaffs_flush_whole_cache(dev); |
| 1545 | if (do_checkpoint) |
| 1546 | yaffs_checkpoint_save(dev); |
| 1547 | } |
| 1548 | |
| 1549 | static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev) |
| 1550 | { |
| 1551 | unsigned erased_chunks = |
| 1552 | dev->n_erased_blocks * dev->param.chunks_per_block; |
| 1553 | struct yaffs_linux_context *context = yaffs_dev_to_lc(dev); |
| 1554 | unsigned scattered = 0; /* Free chunks not in an erased block */ |
| 1555 | |
| 1556 | if (erased_chunks < dev->n_free_chunks) |
| 1557 | scattered = (dev->n_free_chunks - erased_chunks); |
| 1558 | |
| 1559 | if (!context->bg_running) |
| 1560 | return 0; |
| 1561 | else if (scattered < (dev->param.chunks_per_block * 2)) |
| 1562 | return 0; |
| 1563 | else if (erased_chunks > dev->n_free_chunks / 2) |
| 1564 | return 0; |
| 1565 | else if (erased_chunks > dev->n_free_chunks / 4) |
| 1566 | return 1; |
| 1567 | else |
| 1568 | return 2; |
| 1569 | } |
| 1570 | |
| 1571 | static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint) |
| 1572 | { |
| 1573 | |
| 1574 | struct yaffs_dev *dev = yaffs_super_to_dev(sb); |
| 1575 | unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4); |
| 1576 | unsigned gc_urgent = yaffs_bg_gc_urgency(dev); |
| 1577 | int do_checkpoint; |
| 1578 | |
| 1579 | yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, |
| 1580 | "yaffs_do_sync_fs: gc-urgency %d %s %s%s", |
| 1581 | gc_urgent, |
| 1582 | sb->s_dirt ? "dirty" : "clean", |
| 1583 | request_checkpoint ? "checkpoint requested" : "no checkpoint", |
| 1584 | oneshot_checkpoint ? " one-shot" : ""); |
| 1585 | |
| 1586 | yaffs_gross_lock(dev); |
| 1587 | do_checkpoint = ((request_checkpoint && !gc_urgent) || |
| 1588 | oneshot_checkpoint) && !dev->is_checkpointed; |
| 1589 | |
| 1590 | if (sb->s_dirt || do_checkpoint) { |
| 1591 | yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint); |
| 1592 | sb->s_dirt = 0; |
| 1593 | if (oneshot_checkpoint) |
| 1594 | yaffs_auto_checkpoint &= ~4; |
| 1595 | } |
| 1596 | yaffs_gross_unlock(dev); |
| 1597 | |
| 1598 | return 0; |
| 1599 | } |
| 1600 | |
| 1601 | /* |
| 1602 | * yaffs background thread functions . |
| 1603 | * yaffs_bg_thread_fn() the thread function |
| 1604 | * yaffs_bg_start() launches the background thread. |
| 1605 | * yaffs_bg_stop() cleans up the background thread. |
| 1606 | * |
| 1607 | * NB: |
| 1608 | * The thread should only run after the yaffs is initialised |
| 1609 | * The thread should be stopped before yaffs is unmounted. |
| 1610 | * The thread should not do any writing while the fs is in read only. |
| 1611 | */ |
| 1612 | |
| 1613 | void yaffs_background_waker(unsigned long data) |
| 1614 | { |
| 1615 | wake_up_process((struct task_struct *)data); |
| 1616 | } |
| 1617 | |
| 1618 | static int yaffs_bg_thread_fn(void *data) |
| 1619 | { |
| 1620 | struct yaffs_dev *dev = (struct yaffs_dev *)data; |
| 1621 | struct yaffs_linux_context *context = yaffs_dev_to_lc(dev); |
| 1622 | unsigned long now = jiffies; |
| 1623 | unsigned long next_dir_update = now; |
| 1624 | unsigned long next_gc = now; |
| 1625 | unsigned long expires; |
| 1626 | unsigned int urgency; |
| 1627 | |
| 1628 | int gc_result; |
| 1629 | struct timer_list timer; |
| 1630 | |
| 1631 | yaffs_trace(YAFFS_TRACE_BACKGROUND, |
| 1632 | "yaffs_background starting for dev %p", (void *)dev); |
| 1633 | |
| 1634 | set_freezable(); |
| 1635 | while (context->bg_running) { |
| 1636 | yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background"); |
| 1637 | |
| 1638 | if (kthread_should_stop()) |
| 1639 | break; |
| 1640 | |
| 1641 | if (try_to_freeze()) |
| 1642 | continue; |
| 1643 | |
| 1644 | yaffs_gross_lock(dev); |
| 1645 | |
| 1646 | now = jiffies; |
| 1647 | |
| 1648 | if (time_after(now, next_dir_update) && yaffs_bg_enable) { |
| 1649 | yaffs_update_dirty_dirs(dev); |
| 1650 | next_dir_update = now + HZ; |
| 1651 | } |
| 1652 | |
| 1653 | if (time_after(now, next_gc) && yaffs_bg_enable) { |
| 1654 | if (!dev->is_checkpointed) { |
| 1655 | urgency = yaffs_bg_gc_urgency(dev); |
| 1656 | gc_result = yaffs_bg_gc(dev, urgency); |
| 1657 | if (urgency > 1) |
| 1658 | next_gc = now + HZ / 20 + 1; |
| 1659 | else if (urgency > 0) |
| 1660 | next_gc = now + HZ / 10 + 1; |
| 1661 | else |
| 1662 | next_gc = now + HZ * 2; |
| 1663 | } else { |
| 1664 | /* |
| 1665 | * gc not running so set to next_dir_update |
| 1666 | * to cut down on wake ups |
| 1667 | */ |
| 1668 | next_gc = next_dir_update; |
| 1669 | } |
| 1670 | } |
| 1671 | yaffs_gross_unlock(dev); |
| 1672 | expires = next_dir_update; |
| 1673 | if (time_before(next_gc, expires)) |
| 1674 | expires = next_gc; |
| 1675 | if (time_before(expires, now)) |
| 1676 | expires = now + HZ; |
| 1677 | |
| 1678 | Y_INIT_TIMER(&timer); |
| 1679 | timer.expires = expires + 1; |
| 1680 | timer.data = (unsigned long)current; |
| 1681 | timer.function = yaffs_background_waker; |
| 1682 | |
| 1683 | set_current_state(TASK_INTERRUPTIBLE); |
| 1684 | add_timer(&timer); |
| 1685 | schedule(); |
| 1686 | del_timer_sync(&timer); |
| 1687 | } |
| 1688 | |
| 1689 | return 0; |
| 1690 | } |
| 1691 | |
| 1692 | static int yaffs_bg_start(struct yaffs_dev *dev) |
| 1693 | { |
| 1694 | int retval = 0; |
| 1695 | struct yaffs_linux_context *context = yaffs_dev_to_lc(dev); |
| 1696 | |
| 1697 | if (dev->read_only) |
| 1698 | return -1; |
| 1699 | |
| 1700 | context->bg_running = 1; |
| 1701 | |
| 1702 | context->bg_thread = kthread_run(yaffs_bg_thread_fn, |
| 1703 | (void *)dev, "yaffs-bg-%d", |
| 1704 | context->mount_id); |
| 1705 | |
| 1706 | if (IS_ERR(context->bg_thread)) { |
| 1707 | retval = PTR_ERR(context->bg_thread); |
| 1708 | context->bg_thread = NULL; |
| 1709 | context->bg_running = 0; |
| 1710 | } |
| 1711 | return retval; |
| 1712 | } |
| 1713 | |
| 1714 | static void yaffs_bg_stop(struct yaffs_dev *dev) |
| 1715 | { |
| 1716 | struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev); |
| 1717 | |
| 1718 | ctxt->bg_running = 0; |
| 1719 | |
| 1720 | if (ctxt->bg_thread) { |
| 1721 | kthread_stop(ctxt->bg_thread); |
| 1722 | ctxt->bg_thread = NULL; |
| 1723 | } |
| 1724 | } |
| 1725 | |
| 1726 | static void yaffs_write_super(struct super_block *sb) |
| 1727 | { |
| 1728 | unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2); |
| 1729 | |
| 1730 | yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, |
| 1731 | "yaffs_write_super%s", |
| 1732 | request_checkpoint ? " checkpt" : ""); |
| 1733 | |
| 1734 | yaffs_do_sync_fs(sb, request_checkpoint); |
| 1735 | |
| 1736 | } |
| 1737 | |
| 1738 | static int yaffs_sync_fs(struct super_block *sb, int wait) |
| 1739 | { |
| 1740 | unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1); |
| 1741 | |
| 1742 | yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, |
| 1743 | "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : ""); |
| 1744 | |
| 1745 | yaffs_do_sync_fs(sb, request_checkpoint); |
| 1746 | |
| 1747 | return 0; |
| 1748 | } |
| 1749 | |
| 1750 | |
| 1751 | static LIST_HEAD(yaffs_context_list); |
| 1752 | struct mutex yaffs_context_lock; |
| 1753 | |
| 1754 | |
| 1755 | |
| 1756 | struct yaffs_options { |
| 1757 | int inband_tags; |
| 1758 | int skip_checkpoint_read; |
| 1759 | int skip_checkpoint_write; |
| 1760 | int no_cache; |
| 1761 | int tags_ecc_on; |
| 1762 | int tags_ecc_overridden; |
| 1763 | int lazy_loading_enabled; |
| 1764 | int lazy_loading_overridden; |
| 1765 | int empty_lost_and_found; |
| 1766 | int empty_lost_and_found_overridden; |
| 1767 | }; |
| 1768 | |
| 1769 | #define MAX_OPT_LEN 30 |
| 1770 | static int yaffs_parse_options(struct yaffs_options *options, |
| 1771 | const char *options_str) |
| 1772 | { |
| 1773 | char cur_opt[MAX_OPT_LEN + 1]; |
| 1774 | int p; |
| 1775 | int error = 0; |
| 1776 | |
| 1777 | /* Parse through the options which is a comma seperated list */ |
| 1778 | |
| 1779 | while (options_str && *options_str && !error) { |
| 1780 | memset(cur_opt, 0, MAX_OPT_LEN + 1); |
| 1781 | p = 0; |
| 1782 | |
| 1783 | while (*options_str == ',') |
| 1784 | options_str++; |
| 1785 | |
| 1786 | while (*options_str && *options_str != ',') { |
| 1787 | if (p < MAX_OPT_LEN) { |
| 1788 | cur_opt[p] = *options_str; |
| 1789 | p++; |
| 1790 | } |
| 1791 | options_str++; |
| 1792 | } |
| 1793 | |
| 1794 | if (!strcmp(cur_opt, "inband-tags")) { |
| 1795 | options->inband_tags = 1; |
| 1796 | } else if (!strcmp(cur_opt, "tags-ecc-off")) { |
| 1797 | options->tags_ecc_on = 0; |
| 1798 | options->tags_ecc_overridden = 1; |
| 1799 | } else if (!strcmp(cur_opt, "tags-ecc-on")) { |
| 1800 | options->tags_ecc_on = 1; |
| 1801 | options->tags_ecc_overridden = 1; |
| 1802 | } else if (!strcmp(cur_opt, "lazy-loading-off")) { |
| 1803 | options->lazy_loading_enabled = 0; |
| 1804 | options->lazy_loading_overridden = 1; |
| 1805 | } else if (!strcmp(cur_opt, "lazy-loading-on")) { |
| 1806 | options->lazy_loading_enabled = 1; |
| 1807 | options->lazy_loading_overridden = 1; |
| 1808 | } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) { |
| 1809 | options->empty_lost_and_found = 0; |
| 1810 | options->empty_lost_and_found_overridden = 1; |
| 1811 | } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) { |
| 1812 | options->empty_lost_and_found = 1; |
| 1813 | options->empty_lost_and_found_overridden = 1; |
| 1814 | } else if (!strcmp(cur_opt, "no-cache")) { |
| 1815 | options->no_cache = 1; |
| 1816 | } else if (!strcmp(cur_opt, "no-checkpoint-read")) { |
| 1817 | options->skip_checkpoint_read = 1; |
| 1818 | } else if (!strcmp(cur_opt, "no-checkpoint-write")) { |
| 1819 | options->skip_checkpoint_write = 1; |
| 1820 | } else if (!strcmp(cur_opt, "no-checkpoint")) { |
| 1821 | options->skip_checkpoint_read = 1; |
| 1822 | options->skip_checkpoint_write = 1; |
| 1823 | } else { |
| 1824 | printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n", |
| 1825 | cur_opt); |
| 1826 | error = 1; |
| 1827 | } |
| 1828 | } |
| 1829 | |
| 1830 | return error; |
| 1831 | } |
| 1832 | |
| 1833 | static struct address_space_operations yaffs_file_address_operations = { |
| 1834 | .readpage = yaffs_readpage, |
| 1835 | .writepage = yaffs_writepage, |
| 1836 | .write_begin = yaffs_write_begin, |
| 1837 | .write_end = yaffs_write_end, |
| 1838 | }; |
| 1839 | |
| 1840 | |
| 1841 | |
| 1842 | static const struct inode_operations yaffs_file_inode_operations = { |
| 1843 | .setattr = yaffs_setattr, |
| 1844 | #ifdef CONFIG_YAFFS_XATTR |
| 1845 | .setxattr = yaffs_setxattr, |
| 1846 | .getxattr = yaffs_getxattr, |
| 1847 | .listxattr = yaffs_listxattr, |
| 1848 | .removexattr = yaffs_removexattr, |
| 1849 | #endif |
| 1850 | }; |
| 1851 | |
| 1852 | static const struct inode_operations yaffs_symlink_inode_operations = { |
| 1853 | .readlink = yaffs_readlink, |
| 1854 | .follow_link = yaffs_follow_link, |
| 1855 | .put_link = yaffs_put_link, |
| 1856 | .setattr = yaffs_setattr, |
| 1857 | #ifdef CONFIG_YAFFS_XATTR |
| 1858 | .setxattr = yaffs_setxattr, |
| 1859 | .getxattr = yaffs_getxattr, |
| 1860 | .listxattr = yaffs_listxattr, |
| 1861 | .removexattr = yaffs_removexattr, |
| 1862 | #endif |
| 1863 | }; |
| 1864 | |
| 1865 | static void yaffs_fill_inode_from_obj(struct inode *inode, |
| 1866 | struct yaffs_obj *obj) |
| 1867 | { |
| 1868 | if (inode && obj) { |
| 1869 | |
| 1870 | /* Check mode against the variant type and attempt to repair if broken. */ |
| 1871 | u32 mode = obj->yst_mode; |
| 1872 | switch (obj->variant_type) { |
| 1873 | case YAFFS_OBJECT_TYPE_FILE: |
| 1874 | if (!S_ISREG(mode)) { |
| 1875 | obj->yst_mode &= ~S_IFMT; |
| 1876 | obj->yst_mode |= S_IFREG; |
| 1877 | } |
| 1878 | |
| 1879 | break; |
| 1880 | case YAFFS_OBJECT_TYPE_SYMLINK: |
| 1881 | if (!S_ISLNK(mode)) { |
| 1882 | obj->yst_mode &= ~S_IFMT; |
| 1883 | obj->yst_mode |= S_IFLNK; |
| 1884 | } |
| 1885 | |
| 1886 | break; |
| 1887 | case YAFFS_OBJECT_TYPE_DIRECTORY: |
| 1888 | if (!S_ISDIR(mode)) { |
| 1889 | obj->yst_mode &= ~S_IFMT; |
| 1890 | obj->yst_mode |= S_IFDIR; |
| 1891 | } |
| 1892 | |
| 1893 | break; |
| 1894 | case YAFFS_OBJECT_TYPE_UNKNOWN: |
| 1895 | case YAFFS_OBJECT_TYPE_HARDLINK: |
| 1896 | case YAFFS_OBJECT_TYPE_SPECIAL: |
| 1897 | default: |
| 1898 | /* TODO? */ |
| 1899 | break; |
| 1900 | } |
| 1901 | |
| 1902 | inode->i_flags |= S_NOATIME; |
| 1903 | |
| 1904 | inode->i_ino = obj->obj_id; |
| 1905 | inode->i_mode = obj->yst_mode; |
| 1906 | inode->i_uid = obj->yst_uid; |
| 1907 | inode->i_gid = obj->yst_gid; |
| 1908 | |
| 1909 | inode->i_rdev = old_decode_dev(obj->yst_rdev); |
| 1910 | |
| 1911 | inode->i_atime.tv_sec = (time_t) (obj->yst_atime); |
| 1912 | inode->i_atime.tv_nsec = 0; |
| 1913 | inode->i_mtime.tv_sec = (time_t) obj->yst_mtime; |
| 1914 | inode->i_mtime.tv_nsec = 0; |
| 1915 | inode->i_ctime.tv_sec = (time_t) obj->yst_ctime; |
| 1916 | inode->i_ctime.tv_nsec = 0; |
| 1917 | inode->i_size = yaffs_get_obj_length(obj); |
| 1918 | inode->i_blocks = (inode->i_size + 511) >> 9; |
| 1919 | |
| 1920 | inode->i_nlink = yaffs_get_obj_link_count(obj); |
| 1921 | |
| 1922 | yaffs_trace(YAFFS_TRACE_OS, |
| 1923 | "yaffs_fill_inode mode %x uid %d gid %d size %d count %d", |
| 1924 | inode->i_mode, inode->i_uid, inode->i_gid, |
| 1925 | (int)inode->i_size, atomic_read(&inode->i_count)); |
| 1926 | |
| 1927 | switch (obj->yst_mode & S_IFMT) { |
| 1928 | default: /* fifo, device or socket */ |
| 1929 | init_special_inode(inode, obj->yst_mode, |
| 1930 | old_decode_dev(obj->yst_rdev)); |
| 1931 | break; |
| 1932 | case S_IFREG: /* file */ |
| 1933 | inode->i_op = &yaffs_file_inode_operations; |
| 1934 | inode->i_fop = &yaffs_file_operations; |
| 1935 | inode->i_mapping->a_ops = |
| 1936 | &yaffs_file_address_operations; |
| 1937 | break; |
| 1938 | case S_IFDIR: /* directory */ |
| 1939 | inode->i_op = &yaffs_dir_inode_operations; |
| 1940 | inode->i_fop = &yaffs_dir_operations; |
| 1941 | break; |
| 1942 | case S_IFLNK: /* symlink */ |
| 1943 | inode->i_op = &yaffs_symlink_inode_operations; |
| 1944 | break; |
| 1945 | } |
| 1946 | |
| 1947 | yaffs_inode_to_obj_lv(inode) = obj; |
| 1948 | |
| 1949 | obj->my_inode = inode; |
| 1950 | |
| 1951 | } else { |
| 1952 | yaffs_trace(YAFFS_TRACE_OS, |
| 1953 | "yaffs_fill_inode invalid parameters"); |
| 1954 | } |
| 1955 | } |
| 1956 | |
| 1957 | static void yaffs_put_super(struct super_block *sb) |
| 1958 | { |
| 1959 | struct yaffs_dev *dev = yaffs_super_to_dev(sb); |
| 1960 | |
| 1961 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_put_super"); |
| 1962 | |
| 1963 | yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, |
| 1964 | "Shutting down yaffs background thread"); |
| 1965 | yaffs_bg_stop(dev); |
| 1966 | yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, |
| 1967 | "yaffs background thread shut down"); |
| 1968 | |
| 1969 | yaffs_gross_lock(dev); |
| 1970 | |
| 1971 | yaffs_flush_super(sb, 1); |
| 1972 | |
| 1973 | if (yaffs_dev_to_lc(dev)->put_super_fn) |
| 1974 | yaffs_dev_to_lc(dev)->put_super_fn(sb); |
| 1975 | |
| 1976 | yaffs_deinitialise(dev); |
| 1977 | |
| 1978 | yaffs_gross_unlock(dev); |
| 1979 | mutex_lock(&yaffs_context_lock); |
| 1980 | list_del_init(&(yaffs_dev_to_lc(dev)->context_list)); |
| 1981 | mutex_unlock(&yaffs_context_lock); |
| 1982 | |
| 1983 | if (yaffs_dev_to_lc(dev)->spare_buffer) { |
| 1984 | kfree(yaffs_dev_to_lc(dev)->spare_buffer); |
| 1985 | yaffs_dev_to_lc(dev)->spare_buffer = NULL; |
| 1986 | } |
| 1987 | |
| 1988 | kfree(dev); |
| 1989 | } |
| 1990 | |
| 1991 | static void yaffs_mtd_put_super(struct super_block *sb) |
| 1992 | { |
| 1993 | struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb)); |
| 1994 | |
| 1995 | if (mtd->sync) |
| 1996 | mtd->sync(mtd); |
| 1997 | |
| 1998 | put_mtd_device(mtd); |
| 1999 | } |
| 2000 | |
| 2001 | static const struct super_operations yaffs_super_ops = { |
| 2002 | .statfs = yaffs_statfs, |
| 2003 | .put_super = yaffs_put_super, |
| 2004 | .evict_inode = yaffs_evict_inode, |
| 2005 | .sync_fs = yaffs_sync_fs, |
| 2006 | .write_super = yaffs_write_super, |
| 2007 | }; |
| 2008 | |
| 2009 | static struct super_block *yaffs_internal_read_super(int yaffs_version, |
| 2010 | struct super_block *sb, |
| 2011 | void *data, int silent) |
| 2012 | { |
| 2013 | int n_blocks; |
| 2014 | struct inode *inode = NULL; |
| 2015 | struct dentry *root; |
| 2016 | struct yaffs_dev *dev = 0; |
| 2017 | char devname_buf[BDEVNAME_SIZE + 1]; |
| 2018 | struct mtd_info *mtd; |
| 2019 | int err; |
| 2020 | char *data_str = (char *)data; |
| 2021 | struct yaffs_linux_context *context = NULL; |
| 2022 | struct yaffs_param *param; |
| 2023 | |
| 2024 | int read_only = 0; |
| 2025 | |
| 2026 | struct yaffs_options options; |
| 2027 | |
| 2028 | unsigned mount_id; |
| 2029 | int found; |
| 2030 | struct yaffs_linux_context *context_iterator; |
| 2031 | struct list_head *l; |
| 2032 | |
| 2033 | sb->s_magic = YAFFS_MAGIC; |
| 2034 | sb->s_op = &yaffs_super_ops; |
| 2035 | sb->s_flags |= MS_NOATIME; |
| 2036 | |
| 2037 | read_only = ((sb->s_flags & MS_RDONLY) != 0); |
| 2038 | |
| 2039 | sb->s_export_op = &yaffs_export_ops; |
| 2040 | |
| 2041 | if (!sb) |
| 2042 | printk(KERN_INFO "yaffs: sb is NULL\n"); |
| 2043 | else if (!sb->s_dev) |
| 2044 | printk(KERN_INFO "yaffs: sb->s_dev is NULL\n"); |
| 2045 | else if (!yaffs_devname(sb, devname_buf)) |
| 2046 | printk(KERN_INFO "yaffs: devname is NULL\n"); |
| 2047 | else |
| 2048 | printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n", |
| 2049 | sb->s_dev, |
| 2050 | yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw"); |
| 2051 | |
| 2052 | if (!data_str) |
| 2053 | data_str = ""; |
| 2054 | |
| 2055 | printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str); |
| 2056 | |
| 2057 | memset(&options, 0, sizeof(options)); |
| 2058 | |
| 2059 | if (yaffs_parse_options(&options, data_str)) { |
| 2060 | /* Option parsing failed */ |
| 2061 | return NULL; |
| 2062 | } |
| 2063 | |
| 2064 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 2065 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 2066 | |
| 2067 | yaffs_trace(YAFFS_TRACE_OS, |
| 2068 | "yaffs_read_super: Using yaffs%d", yaffs_version); |
| 2069 | yaffs_trace(YAFFS_TRACE_OS, |
| 2070 | "yaffs_read_super: block size %d", (int)(sb->s_blocksize)); |
| 2071 | |
| 2072 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2073 | "Attempting MTD mount of %u.%u,\"%s\"", |
| 2074 | MAJOR(sb->s_dev), MINOR(sb->s_dev), |
| 2075 | yaffs_devname(sb, devname_buf)); |
| 2076 | |
| 2077 | /* Check it's an mtd device..... */ |
| 2078 | if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) |
| 2079 | return NULL; /* This isn't an mtd device */ |
| 2080 | |
| 2081 | /* Get the device */ |
| 2082 | mtd = get_mtd_device(NULL, MINOR(sb->s_dev)); |
| 2083 | if (!mtd) { |
| 2084 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2085 | "MTD device #%u doesn't appear to exist", |
| 2086 | MINOR(sb->s_dev)); |
| 2087 | return NULL; |
| 2088 | } |
| 2089 | /* Check it's NAND */ |
| 2090 | if (mtd->type != MTD_NANDFLASH) { |
| 2091 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2092 | "MTD device is not NAND it's type %d", |
| 2093 | mtd->type); |
| 2094 | return NULL; |
| 2095 | } |
| 2096 | |
| 2097 | yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->erase); |
| 2098 | yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->read); |
| 2099 | yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->write); |
| 2100 | yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->read_oob); |
| 2101 | yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->write_oob); |
| 2102 | yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->block_isbad); |
| 2103 | yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->block_markbad); |
| 2104 | yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd)); |
| 2105 | yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize); |
| 2106 | yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize); |
| 2107 | yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size); |
| 2108 | |
| 2109 | #ifdef CONFIG_YAFFS_AUTO_YAFFS2 |
| 2110 | |
| 2111 | if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) { |
| 2112 | yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2"); |
| 2113 | yaffs_version = 2; |
| 2114 | } |
| 2115 | |
| 2116 | /* Added NCB 26/5/2006 for completeness */ |
| 2117 | if (yaffs_version == 2 && !options.inband_tags |
| 2118 | && WRITE_SIZE(mtd) == 512) { |
| 2119 | yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1"); |
| 2120 | yaffs_version = 1; |
| 2121 | } |
| 2122 | #endif |
| 2123 | |
| 2124 | if (yaffs_version == 2) { |
| 2125 | /* Check for version 2 style functions */ |
| 2126 | if (!mtd->erase || |
| 2127 | !mtd->block_isbad || |
| 2128 | !mtd->block_markbad || |
| 2129 | !mtd->read || |
| 2130 | !mtd->write || !mtd->read_oob || !mtd->write_oob) { |
| 2131 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2132 | "MTD device does not support required functions"); |
| 2133 | return NULL; |
| 2134 | } |
| 2135 | |
| 2136 | if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE || |
| 2137 | mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) && |
| 2138 | !options.inband_tags) { |
| 2139 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2140 | "MTD device does not have the right page sizes"); |
| 2141 | return NULL; |
| 2142 | } |
| 2143 | } else { |
| 2144 | /* Check for V1 style functions */ |
| 2145 | if (!mtd->erase || |
| 2146 | !mtd->read || |
| 2147 | !mtd->write || !mtd->read_oob || !mtd->write_oob) { |
| 2148 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2149 | "MTD device does not support required functions"); |
| 2150 | return NULL; |
| 2151 | } |
| 2152 | |
| 2153 | if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK || |
| 2154 | mtd->oobsize != YAFFS_BYTES_PER_SPARE) { |
| 2155 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2156 | "MTD device does not support have the right page sizes"); |
| 2157 | return NULL; |
| 2158 | } |
| 2159 | } |
| 2160 | |
| 2161 | /* OK, so if we got here, we have an MTD that's NAND and looks |
| 2162 | * like it has the right capabilities |
| 2163 | * Set the struct yaffs_dev up for mtd |
| 2164 | */ |
| 2165 | |
| 2166 | if (!read_only && !(mtd->flags & MTD_WRITEABLE)) { |
| 2167 | read_only = 1; |
| 2168 | printk(KERN_INFO |
| 2169 | "yaffs: mtd is read only, setting superblock read only"); |
| 2170 | sb->s_flags |= MS_RDONLY; |
| 2171 | } |
| 2172 | |
| 2173 | dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL); |
| 2174 | context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL); |
| 2175 | |
| 2176 | if (!dev || !context) { |
| 2177 | if (dev) |
| 2178 | kfree(dev); |
| 2179 | if (context) |
| 2180 | kfree(context); |
| 2181 | dev = NULL; |
| 2182 | context = NULL; |
| 2183 | } |
| 2184 | |
| 2185 | if (!dev) { |
| 2186 | /* Deep shit could not allocate device structure */ |
| 2187 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2188 | "yaffs_read_super failed trying to allocate yaffs_dev"); |
| 2189 | return NULL; |
| 2190 | } |
| 2191 | memset(dev, 0, sizeof(struct yaffs_dev)); |
| 2192 | param = &(dev->param); |
| 2193 | |
| 2194 | memset(context, 0, sizeof(struct yaffs_linux_context)); |
| 2195 | dev->os_context = context; |
| 2196 | INIT_LIST_HEAD(&(context->context_list)); |
| 2197 | context->dev = dev; |
| 2198 | context->super = sb; |
| 2199 | |
| 2200 | dev->read_only = read_only; |
| 2201 | |
| 2202 | sb->s_fs_info = dev; |
| 2203 | |
| 2204 | dev->driver_context = mtd; |
| 2205 | param->name = mtd->name; |
| 2206 | |
| 2207 | /* Set up the memory size parameters.... */ |
| 2208 | |
| 2209 | n_blocks = |
| 2210 | YCALCBLOCKS(mtd->size, |
| 2211 | (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK)); |
| 2212 | |
| 2213 | param->start_block = 0; |
| 2214 | param->end_block = n_blocks - 1; |
| 2215 | param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK; |
| 2216 | param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK; |
| 2217 | param->n_reserved_blocks = 5; |
| 2218 | param->n_caches = (options.no_cache) ? 0 : 10; |
| 2219 | param->inband_tags = options.inband_tags; |
| 2220 | |
| 2221 | #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD |
| 2222 | param->disable_lazy_load = 1; |
| 2223 | #endif |
| 2224 | #ifdef CONFIG_YAFFS_XATTR |
| 2225 | param->enable_xattr = 1; |
| 2226 | #endif |
| 2227 | if (options.lazy_loading_overridden) |
| 2228 | param->disable_lazy_load = !options.lazy_loading_enabled; |
| 2229 | |
| 2230 | #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC |
| 2231 | param->no_tags_ecc = 1; |
| 2232 | #endif |
| 2233 | |
| 2234 | #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND |
| 2235 | #else |
| 2236 | param->defered_dir_update = 1; |
| 2237 | #endif |
| 2238 | |
| 2239 | if (options.tags_ecc_overridden) |
| 2240 | param->no_tags_ecc = !options.tags_ecc_on; |
| 2241 | |
| 2242 | #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND |
| 2243 | param->empty_lost_n_found = 1; |
| 2244 | #endif |
| 2245 | |
| 2246 | #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING |
| 2247 | param->refresh_period = 0; |
| 2248 | #else |
| 2249 | param->refresh_period = 500; |
| 2250 | #endif |
| 2251 | |
| 2252 | #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED |
| 2253 | param->always_check_erased = 1; |
| 2254 | #endif |
| 2255 | |
| 2256 | if (options.empty_lost_and_found_overridden) |
| 2257 | param->empty_lost_n_found = options.empty_lost_and_found; |
| 2258 | |
| 2259 | /* ... and the functions. */ |
| 2260 | if (yaffs_version == 2) { |
| 2261 | param->write_chunk_tags_fn = nandmtd2_write_chunk_tags; |
| 2262 | param->read_chunk_tags_fn = nandmtd2_read_chunk_tags; |
| 2263 | param->bad_block_fn = nandmtd2_mark_block_bad; |
| 2264 | param->query_block_fn = nandmtd2_query_block; |
| 2265 | yaffs_dev_to_lc(dev)->spare_buffer = |
| 2266 | kmalloc(mtd->oobsize, GFP_NOFS); |
| 2267 | param->is_yaffs2 = 1; |
| 2268 | param->total_bytes_per_chunk = mtd->writesize; |
| 2269 | param->chunks_per_block = mtd->erasesize / mtd->writesize; |
| 2270 | n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize); |
| 2271 | |
| 2272 | param->start_block = 0; |
| 2273 | param->end_block = n_blocks - 1; |
| 2274 | } else { |
| 2275 | /* use the MTD interface in yaffs_mtdif1.c */ |
| 2276 | param->write_chunk_tags_fn = nandmtd1_write_chunk_tags; |
| 2277 | param->read_chunk_tags_fn = nandmtd1_read_chunk_tags; |
| 2278 | param->bad_block_fn = nandmtd1_mark_block_bad; |
| 2279 | param->query_block_fn = nandmtd1_query_block; |
| 2280 | param->is_yaffs2 = 0; |
| 2281 | } |
| 2282 | /* ... and common functions */ |
| 2283 | param->erase_fn = nandmtd_erase_block; |
| 2284 | param->initialise_flash_fn = nandmtd_initialise; |
| 2285 | |
| 2286 | yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super; |
| 2287 | |
| 2288 | param->sb_dirty_fn = yaffs_touch_super; |
| 2289 | param->gc_control = yaffs_gc_control_callback; |
| 2290 | |
| 2291 | yaffs_dev_to_lc(dev)->super = sb; |
| 2292 | |
| 2293 | #ifndef CONFIG_YAFFS_DOES_ECC |
| 2294 | param->use_nand_ecc = 1; |
| 2295 | #endif |
| 2296 | |
| 2297 | param->skip_checkpt_rd = options.skip_checkpoint_read; |
| 2298 | param->skip_checkpt_wr = options.skip_checkpoint_write; |
| 2299 | |
| 2300 | mutex_lock(&yaffs_context_lock); |
| 2301 | /* Get a mount id */ |
| 2302 | found = 0; |
| 2303 | for (mount_id = 0; !found; mount_id++) { |
| 2304 | found = 1; |
| 2305 | list_for_each(l, &yaffs_context_list) { |
| 2306 | context_iterator = |
| 2307 | list_entry(l, struct yaffs_linux_context, |
| 2308 | context_list); |
| 2309 | if (context_iterator->mount_id == mount_id) |
| 2310 | found = 0; |
| 2311 | } |
| 2312 | } |
| 2313 | context->mount_id = mount_id; |
| 2314 | |
| 2315 | list_add_tail(&(yaffs_dev_to_lc(dev)->context_list), |
| 2316 | &yaffs_context_list); |
| 2317 | mutex_unlock(&yaffs_context_lock); |
| 2318 | |
| 2319 | /* Directory search handling... */ |
| 2320 | INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts)); |
| 2321 | param->remove_obj_fn = yaffs_remove_obj_callback; |
| 2322 | |
| 2323 | mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock)); |
| 2324 | |
| 2325 | yaffs_gross_lock(dev); |
| 2326 | |
| 2327 | err = yaffs_guts_initialise(dev); |
| 2328 | |
| 2329 | yaffs_trace(YAFFS_TRACE_OS, |
| 2330 | "yaffs_read_super: guts initialised %s", |
| 2331 | (err == YAFFS_OK) ? "OK" : "FAILED"); |
| 2332 | |
| 2333 | if (err == YAFFS_OK) |
| 2334 | yaffs_bg_start(dev); |
| 2335 | |
| 2336 | if (!context->bg_thread) |
| 2337 | param->defered_dir_update = 0; |
| 2338 | |
| 2339 | /* Release lock before yaffs_get_inode() */ |
| 2340 | yaffs_gross_unlock(dev); |
| 2341 | |
| 2342 | /* Create root inode */ |
| 2343 | if (err == YAFFS_OK) |
| 2344 | inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev)); |
| 2345 | |
| 2346 | if (!inode) |
| 2347 | return NULL; |
| 2348 | |
| 2349 | inode->i_op = &yaffs_dir_inode_operations; |
| 2350 | inode->i_fop = &yaffs_dir_operations; |
| 2351 | |
| 2352 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode"); |
| 2353 | |
| 2354 | root = d_alloc_root(inode); |
| 2355 | |
| 2356 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done"); |
| 2357 | |
| 2358 | if (!root) { |
| 2359 | iput(inode); |
| 2360 | return NULL; |
| 2361 | } |
| 2362 | sb->s_root = root; |
| 2363 | sb->s_dirt = !dev->is_checkpointed; |
| 2364 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2365 | "yaffs_read_super: is_checkpointed %d", |
| 2366 | dev->is_checkpointed); |
| 2367 | |
| 2368 | yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done"); |
| 2369 | return sb; |
| 2370 | } |
| 2371 | |
| 2372 | static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data, |
| 2373 | int silent) |
| 2374 | { |
| 2375 | return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL; |
| 2376 | } |
| 2377 | |
| 2378 | static int yaffs_read_super(struct file_system_type *fs, |
| 2379 | int flags, const char *dev_name, |
| 2380 | void *data, struct vfsmount *mnt) |
| 2381 | { |
| 2382 | |
| 2383 | return get_sb_bdev(fs, flags, dev_name, data, |
| 2384 | yaffs_internal_read_super_mtd, mnt); |
| 2385 | } |
| 2386 | |
| 2387 | static struct file_system_type yaffs_fs_type = { |
| 2388 | .owner = THIS_MODULE, |
| 2389 | .name = "yaffs", |
| 2390 | .get_sb = yaffs_read_super, |
| 2391 | .kill_sb = kill_block_super, |
| 2392 | .fs_flags = FS_REQUIRES_DEV, |
| 2393 | }; |
| 2394 | |
| 2395 | #ifdef CONFIG_YAFFS_YAFFS2 |
| 2396 | |
| 2397 | static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data, |
| 2398 | int silent) |
| 2399 | { |
| 2400 | return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL; |
| 2401 | } |
| 2402 | |
| 2403 | static int yaffs2_read_super(struct file_system_type *fs, |
| 2404 | int flags, const char *dev_name, void *data, |
| 2405 | struct vfsmount *mnt) |
| 2406 | { |
| 2407 | return get_sb_bdev(fs, flags, dev_name, data, |
| 2408 | yaffs2_internal_read_super_mtd, mnt); |
| 2409 | } |
| 2410 | |
| 2411 | static struct file_system_type yaffs2_fs_type = { |
| 2412 | .owner = THIS_MODULE, |
| 2413 | .name = "yaffs2", |
| 2414 | .get_sb = yaffs2_read_super, |
| 2415 | .kill_sb = kill_block_super, |
| 2416 | .fs_flags = FS_REQUIRES_DEV, |
| 2417 | }; |
| 2418 | #endif /* CONFIG_YAFFS_YAFFS2 */ |
| 2419 | |
| 2420 | static struct proc_dir_entry *my_proc_entry; |
| 2421 | |
| 2422 | static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev) |
| 2423 | { |
| 2424 | struct yaffs_param *param = &dev->param; |
| 2425 | buf += sprintf(buf, "start_block........... %d\n", param->start_block); |
| 2426 | buf += sprintf(buf, "end_block............. %d\n", param->end_block); |
| 2427 | buf += sprintf(buf, "total_bytes_per_chunk. %d\n", |
| 2428 | param->total_bytes_per_chunk); |
| 2429 | buf += sprintf(buf, "use_nand_ecc.......... %d\n", |
| 2430 | param->use_nand_ecc); |
| 2431 | buf += sprintf(buf, "no_tags_ecc........... %d\n", param->no_tags_ecc); |
| 2432 | buf += sprintf(buf, "is_yaffs2............. %d\n", param->is_yaffs2); |
| 2433 | buf += sprintf(buf, "inband_tags........... %d\n", param->inband_tags); |
| 2434 | buf += sprintf(buf, "empty_lost_n_found.... %d\n", |
| 2435 | param->empty_lost_n_found); |
| 2436 | buf += sprintf(buf, "disable_lazy_load..... %d\n", |
| 2437 | param->disable_lazy_load); |
| 2438 | buf += sprintf(buf, "refresh_period........ %d\n", |
| 2439 | param->refresh_period); |
| 2440 | buf += sprintf(buf, "n_caches.............. %d\n", param->n_caches); |
| 2441 | buf += sprintf(buf, "n_reserved_blocks..... %d\n", |
| 2442 | param->n_reserved_blocks); |
| 2443 | buf += sprintf(buf, "always_check_erased... %d\n", |
| 2444 | param->always_check_erased); |
| 2445 | |
| 2446 | return buf; |
| 2447 | } |
| 2448 | |
| 2449 | static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev) |
| 2450 | { |
| 2451 | buf += |
| 2452 | sprintf(buf, "data_bytes_per_chunk.. %d\n", |
| 2453 | dev->data_bytes_per_chunk); |
| 2454 | buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits); |
| 2455 | buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size); |
| 2456 | buf += |
| 2457 | sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks); |
| 2458 | buf += |
| 2459 | sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt); |
| 2460 | buf += sprintf(buf, "\n"); |
| 2461 | buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes); |
| 2462 | buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj); |
| 2463 | buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks); |
| 2464 | buf += sprintf(buf, "\n"); |
| 2465 | buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes); |
| 2466 | buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads); |
| 2467 | buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures); |
| 2468 | buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies); |
| 2469 | buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs); |
| 2470 | buf += |
| 2471 | sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count); |
| 2472 | buf += |
| 2473 | sprintf(buf, "oldest_dirty_gc_count. %u\n", |
| 2474 | dev->oldest_dirty_gc_count); |
| 2475 | buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks); |
| 2476 | buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs); |
| 2477 | buf += |
| 2478 | sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes); |
| 2479 | buf += |
| 2480 | sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks); |
| 2481 | buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed); |
| 2482 | buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed); |
| 2483 | buf += |
| 2484 | sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed); |
| 2485 | buf += |
| 2486 | sprintf(buf, "n_tags_ecc_unfixed.... %u\n", |
| 2487 | dev->n_tags_ecc_unfixed); |
| 2488 | buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits); |
| 2489 | buf += |
| 2490 | sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files); |
| 2491 | buf += |
| 2492 | sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files); |
| 2493 | buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count); |
| 2494 | buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions); |
| 2495 | |
| 2496 | return buf; |
| 2497 | } |
| 2498 | |
| 2499 | static int yaffs_proc_read(char *page, |
| 2500 | char **start, |
| 2501 | off_t offset, int count, int *eof, void *data) |
| 2502 | { |
| 2503 | struct list_head *item; |
| 2504 | char *buf = page; |
| 2505 | int step = offset; |
| 2506 | int n = 0; |
| 2507 | |
| 2508 | /* Get proc_file_read() to step 'offset' by one on each sucessive call. |
| 2509 | * We use 'offset' (*ppos) to indicate where we are in dev_list. |
| 2510 | * This also assumes the user has posted a read buffer large |
| 2511 | * enough to hold the complete output; but that's life in /proc. |
| 2512 | */ |
| 2513 | |
| 2514 | *(int *)start = 1; |
| 2515 | |
| 2516 | /* Print header first */ |
| 2517 | if (step == 0) |
| 2518 | buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ "\n"); |
| 2519 | else if (step == 1) |
| 2520 | buf += sprintf(buf, "\n"); |
| 2521 | else { |
| 2522 | step -= 2; |
| 2523 | |
| 2524 | mutex_lock(&yaffs_context_lock); |
| 2525 | |
| 2526 | /* Locate and print the Nth entry. Order N-squared but N is small. */ |
| 2527 | list_for_each(item, &yaffs_context_list) { |
| 2528 | struct yaffs_linux_context *dc = |
| 2529 | list_entry(item, struct yaffs_linux_context, |
| 2530 | context_list); |
| 2531 | struct yaffs_dev *dev = dc->dev; |
| 2532 | |
| 2533 | if (n < (step & ~1)) { |
| 2534 | n += 2; |
| 2535 | continue; |
| 2536 | } |
| 2537 | if ((step & 1) == 0) { |
| 2538 | buf += |
| 2539 | sprintf(buf, "\nDevice %d \"%s\"\n", n, |
| 2540 | dev->param.name); |
| 2541 | buf = yaffs_dump_dev_part0(buf, dev); |
| 2542 | } else { |
| 2543 | buf = yaffs_dump_dev_part1(buf, dev); |
| 2544 | } |
| 2545 | |
| 2546 | break; |
| 2547 | } |
| 2548 | mutex_unlock(&yaffs_context_lock); |
| 2549 | } |
| 2550 | |
| 2551 | return buf - page < count ? buf - page : count; |
| 2552 | } |
| 2553 | |
| 2554 | |
| 2555 | /** |
| 2556 | * Set the verbosity of the warnings and error messages. |
| 2557 | * |
| 2558 | * Note that the names can only be a..z or _ with the current code. |
| 2559 | */ |
| 2560 | |
| 2561 | static struct { |
| 2562 | char *mask_name; |
| 2563 | unsigned mask_bitfield; |
| 2564 | } mask_flags[] = { |
| 2565 | {"allocate", YAFFS_TRACE_ALLOCATE}, |
| 2566 | {"always", YAFFS_TRACE_ALWAYS}, |
| 2567 | {"background", YAFFS_TRACE_BACKGROUND}, |
| 2568 | {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS}, |
| 2569 | {"buffers", YAFFS_TRACE_BUFFERS}, |
| 2570 | {"bug", YAFFS_TRACE_BUG}, |
| 2571 | {"checkpt", YAFFS_TRACE_CHECKPOINT}, |
| 2572 | {"deletion", YAFFS_TRACE_DELETION}, |
| 2573 | {"erase", YAFFS_TRACE_ERASE}, |
| 2574 | {"error", YAFFS_TRACE_ERROR}, |
| 2575 | {"gc_detail", YAFFS_TRACE_GC_DETAIL}, |
| 2576 | {"gc", YAFFS_TRACE_GC}, |
| 2577 | {"lock", YAFFS_TRACE_LOCK}, |
| 2578 | {"mtd", YAFFS_TRACE_MTD}, |
| 2579 | {"nandaccess", YAFFS_TRACE_NANDACCESS}, |
| 2580 | {"os", YAFFS_TRACE_OS}, |
| 2581 | {"scan_debug", YAFFS_TRACE_SCAN_DEBUG}, |
| 2582 | {"scan", YAFFS_TRACE_SCAN}, |
| 2583 | {"mount", YAFFS_TRACE_MOUNT}, |
| 2584 | {"tracing", YAFFS_TRACE_TRACING}, |
| 2585 | {"sync", YAFFS_TRACE_SYNC}, |
| 2586 | {"write", YAFFS_TRACE_WRITE}, |
| 2587 | {"verify", YAFFS_TRACE_VERIFY}, |
| 2588 | {"verify_nand", YAFFS_TRACE_VERIFY_NAND}, |
| 2589 | {"verify_full", YAFFS_TRACE_VERIFY_FULL}, |
| 2590 | {"verify_all", YAFFS_TRACE_VERIFY_ALL}, |
| 2591 | {"all", 0xffffffff}, |
| 2592 | {"none", 0}, |
| 2593 | {NULL, 0}, |
| 2594 | }; |
| 2595 | |
| 2596 | #define MAX_MASK_NAME_LENGTH 40 |
| 2597 | static int yaffs_proc_write_trace_options(struct file *file, const char *buf, |
| 2598 | unsigned long count, void *data) |
| 2599 | { |
| 2600 | unsigned rg = 0, mask_bitfield; |
| 2601 | char *end; |
| 2602 | char *mask_name; |
| 2603 | const char *x; |
| 2604 | char substring[MAX_MASK_NAME_LENGTH + 1]; |
| 2605 | int i; |
| 2606 | int done = 0; |
| 2607 | int add, len = 0; |
| 2608 | int pos = 0; |
| 2609 | |
| 2610 | rg = yaffs_trace_mask; |
| 2611 | |
| 2612 | while (!done && (pos < count)) { |
| 2613 | done = 1; |
| 2614 | while ((pos < count) && isspace(buf[pos])) |
| 2615 | pos++; |
| 2616 | |
| 2617 | switch (buf[pos]) { |
| 2618 | case '+': |
| 2619 | case '-': |
| 2620 | case '=': |
| 2621 | add = buf[pos]; |
| 2622 | pos++; |
| 2623 | break; |
| 2624 | |
| 2625 | default: |
| 2626 | add = ' '; |
| 2627 | break; |
| 2628 | } |
| 2629 | mask_name = NULL; |
| 2630 | |
| 2631 | mask_bitfield = simple_strtoul(buf + pos, &end, 0); |
| 2632 | |
| 2633 | if (end > buf + pos) { |
| 2634 | mask_name = "numeral"; |
| 2635 | len = end - (buf + pos); |
| 2636 | pos += len; |
| 2637 | done = 0; |
| 2638 | } else { |
| 2639 | for (x = buf + pos, i = 0; |
| 2640 | (*x == '_' || (*x >= 'a' && *x <= 'z')) && |
| 2641 | i < MAX_MASK_NAME_LENGTH; x++, i++, pos++) |
| 2642 | substring[i] = *x; |
| 2643 | substring[i] = '\0'; |
| 2644 | |
| 2645 | for (i = 0; mask_flags[i].mask_name != NULL; i++) { |
| 2646 | if (strcmp(substring, mask_flags[i].mask_name) |
| 2647 | == 0) { |
| 2648 | mask_name = mask_flags[i].mask_name; |
| 2649 | mask_bitfield = |
| 2650 | mask_flags[i].mask_bitfield; |
| 2651 | done = 0; |
| 2652 | break; |
| 2653 | } |
| 2654 | } |
| 2655 | } |
| 2656 | |
| 2657 | if (mask_name != NULL) { |
| 2658 | done = 0; |
| 2659 | switch (add) { |
| 2660 | case '-': |
| 2661 | rg &= ~mask_bitfield; |
| 2662 | break; |
| 2663 | case '+': |
| 2664 | rg |= mask_bitfield; |
| 2665 | break; |
| 2666 | case '=': |
| 2667 | rg = mask_bitfield; |
| 2668 | break; |
| 2669 | default: |
| 2670 | rg |= mask_bitfield; |
| 2671 | break; |
| 2672 | } |
| 2673 | } |
| 2674 | } |
| 2675 | |
| 2676 | yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS; |
| 2677 | |
| 2678 | printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask); |
| 2679 | |
| 2680 | if (rg & YAFFS_TRACE_ALWAYS) { |
| 2681 | for (i = 0; mask_flags[i].mask_name != NULL; i++) { |
| 2682 | char flag; |
| 2683 | flag = ((rg & mask_flags[i].mask_bitfield) == |
| 2684 | mask_flags[i].mask_bitfield) ? '+' : '-'; |
| 2685 | printk(KERN_DEBUG "%c%s\n", flag, |
| 2686 | mask_flags[i].mask_name); |
| 2687 | } |
| 2688 | } |
| 2689 | |
| 2690 | return count; |
| 2691 | } |
| 2692 | |
| 2693 | static int yaffs_proc_write(struct file *file, const char *buf, |
| 2694 | unsigned long count, void *data) |
| 2695 | { |
| 2696 | return yaffs_proc_write_trace_options(file, buf, count, data); |
| 2697 | } |
| 2698 | |
| 2699 | /* Stuff to handle installation of file systems */ |
| 2700 | struct file_system_to_install { |
| 2701 | struct file_system_type *fst; |
| 2702 | int installed; |
| 2703 | }; |
| 2704 | |
| 2705 | static struct file_system_to_install fs_to_install[] = { |
| 2706 | {&yaffs_fs_type, 0}, |
| 2707 | {&yaffs2_fs_type, 0}, |
| 2708 | {NULL, 0} |
| 2709 | }; |
| 2710 | |
| 2711 | static int __init init_yaffs_fs(void) |
| 2712 | { |
| 2713 | int error = 0; |
| 2714 | struct file_system_to_install *fsinst; |
| 2715 | |
| 2716 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2717 | "yaffs built " __DATE__ " " __TIME__ " Installing."); |
| 2718 | |
| 2719 | #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED |
| 2720 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2721 | "\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n"); |
| 2722 | #endif |
| 2723 | |
| 2724 | mutex_init(&yaffs_context_lock); |
| 2725 | |
| 2726 | /* Install the proc_fs entries */ |
| 2727 | my_proc_entry = create_proc_entry("yaffs", |
| 2728 | S_IRUGO | S_IFREG, YPROC_ROOT); |
| 2729 | |
| 2730 | if (my_proc_entry) { |
| 2731 | my_proc_entry->write_proc = yaffs_proc_write; |
| 2732 | my_proc_entry->read_proc = yaffs_proc_read; |
| 2733 | my_proc_entry->data = NULL; |
| 2734 | } else { |
| 2735 | return -ENOMEM; |
| 2736 | } |
| 2737 | |
| 2738 | |
| 2739 | /* Now add the file system entries */ |
| 2740 | |
| 2741 | fsinst = fs_to_install; |
| 2742 | |
| 2743 | while (fsinst->fst && !error) { |
| 2744 | error = register_filesystem(fsinst->fst); |
| 2745 | if (!error) |
| 2746 | fsinst->installed = 1; |
| 2747 | fsinst++; |
| 2748 | } |
| 2749 | |
| 2750 | /* Any errors? uninstall */ |
| 2751 | if (error) { |
| 2752 | fsinst = fs_to_install; |
| 2753 | |
| 2754 | while (fsinst->fst) { |
| 2755 | if (fsinst->installed) { |
| 2756 | unregister_filesystem(fsinst->fst); |
| 2757 | fsinst->installed = 0; |
| 2758 | } |
| 2759 | fsinst++; |
| 2760 | } |
| 2761 | } |
| 2762 | |
| 2763 | return error; |
| 2764 | } |
| 2765 | |
| 2766 | static void __exit exit_yaffs_fs(void) |
| 2767 | { |
| 2768 | |
| 2769 | struct file_system_to_install *fsinst; |
| 2770 | |
| 2771 | yaffs_trace(YAFFS_TRACE_ALWAYS, |
| 2772 | "yaffs built " __DATE__ " " __TIME__ " removing."); |
| 2773 | |
| 2774 | remove_proc_entry("yaffs", YPROC_ROOT); |
| 2775 | |
| 2776 | fsinst = fs_to_install; |
| 2777 | |
| 2778 | while (fsinst->fst) { |
| 2779 | if (fsinst->installed) { |
| 2780 | unregister_filesystem(fsinst->fst); |
| 2781 | fsinst->installed = 0; |
| 2782 | } |
| 2783 | fsinst++; |
| 2784 | } |
| 2785 | } |
| 2786 | |
| 2787 | module_init(init_yaffs_fs) |
| 2788 | module_exit(exit_yaffs_fs) |
| 2789 | |
| 2790 | MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system"); |
| 2791 | MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010"); |
| 2792 | MODULE_LICENSE("GPL"); |