1 /* 2 * YAFFS: Yet another FFS. A NAND-flash specific file system. 3 * yaffs_fs.c 4 * 5 * Copyright (C) 2002 Aleph One Ltd. 6 * for Toby Churchill Ltd and Brightstar Engineering 7 * 8 * Created by Charles Manning <charles (at) aleph1.co.uk> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 * 14 * This is the file system front-end to YAFFS that hooks it up to 15 * the VFS. 16 * 17 * Special notes: 18 * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with 19 * this superblock 20 * >> 2.6: sb->s_fs_info points to the yaffs_Device associated with this 21 * superblock 22 * >> inode->u.generic_ip points to the associated yaffs_Object. 23 * 24 * Acknowledgements: 25 * * Luc van OostenRyck for numerous patches. 26 * * Nick Bane for numerous patches. 27 * * Nick Bane for 2.5/2.6 integration. 28 * * Andras Toth for mknod rdev issue. 29 * * Michael Fischer for finding the problem with inode inconsistency. 30 * * Some code bodily lifted from JFFS2. 31 */ 32 33 const char *yaffs_fs_c_version = 34 "$Id: yaffs_fs.c,v 1.53 2006/10/03 10:13:03 charles Exp $"; 35 extern const char *yaffs_guts_c_version; 36 37 #include <linux/config.h> 38 #include <linux/kernel.h> 39 #include <linux/module.h> 40 #include <linux/version.h> 41 #include <linux/slab.h> 42 #include <linux/init.h> 43 #include <linux/list.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 53 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 54 55 #include <linux/statfs.h> /* Added NCB 15-8-2003 */ 56 #include <asm/statfs.h> 57 #define UnlockPage(p) unlock_page(p) 58 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags) 59 60 /* FIXME: use sb->s_id instead ? */ 61 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf) 62 63 #else 64 65 #include <linux/locks.h> 66 #define BDEVNAME_SIZE 0 67 #define yaffs_devname(sb, buf) kdevname(sb->s_dev) 68 69 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) 70 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */ 71 #define __user 72 #endif 73 74 #endif 75 76 #include <asm/uaccess.h> 77 78 #include "yportenv.h" 79 #include "yaffs_guts.h" 80 81 unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | 82 YAFFS_TRACE_BAD_BLOCKS | 83 YAFFS_TRACE_CHECKPOINT 84 /* | 0xFFFFFFFF */; 85 86 #include <linux/mtd/mtd.h> 87 #include "yaffs_mtdif.h" 88 #include "yaffs_mtdif2.h" 89 90 /*#define T(x) printk x */ 91 92 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)((iptr)->u.generic_ip)) 93 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode) 94 95 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 96 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info) 97 #else 98 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp) 99 #endif 100 101 static void yaffs_put_super(struct super_block *sb); 102 103 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, 104 loff_t * pos); 105 106 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 107 static int yaffs_file_flush(struct file *file, fl_owner_t id); 108 #else 109 static int yaffs_file_flush(struct file *file); 110 #endif 111 112 static int yaffs_sync_object(struct file *file, struct dentry *dentry, 113 int datasync); 114 115 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir); 116 117 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 118 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, 119 struct nameidata *n); 120 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, 121 struct nameidata *n); 122 #else 123 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode); 124 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry); 125 #endif 126 static int yaffs_link(struct dentry *old_dentry, struct inode *dir, 127 struct dentry *dentry); 128 static int yaffs_unlink(struct inode *dir, struct dentry *dentry); 129 static int yaffs_symlink(struct inode *dir, struct dentry *dentry, 130 const char *symname); 131 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode); 132 133 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 134 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, 135 dev_t dev); 136 #else 137 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, 138 int dev); 139 #endif 140 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry, 141 struct inode *new_dir, struct dentry *new_dentry); 142 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr); 143 144 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 145 static int yaffs_sync_fs(struct super_block *sb, int wait); 146 static void yaffs_write_super(struct super_block *sb); 147 #else 148 static int yaffs_sync_fs(struct super_block *sb); 149 static int yaffs_write_super(struct super_block *sb); 150 #endif 151 152 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 153 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf); 154 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 155 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf); 156 #else 157 static int yaffs_statfs(struct super_block *sb, struct statfs *buf); 158 #endif 159 static void yaffs_read_inode(struct inode *inode); 160 161 static void yaffs_put_inode(struct inode *inode); 162 static void yaffs_delete_inode(struct inode *); 163 static void yaffs_clear_inode(struct inode *); 164 165 static int yaffs_readpage(struct file *file, struct page *page); 166 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 167 static int yaffs_writepage(struct page *page, struct writeback_control *wbc); 168 #else 169 static int yaffs_writepage(struct page *page); 170 #endif 171 static int yaffs_prepare_write(struct file *f, struct page *pg, 172 unsigned offset, unsigned to); 173 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, 174 unsigned to); 175 176 static int yaffs_readlink(struct dentry *dentry, char __user * buffer, 177 int buflen); 178 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13)) 179 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd); 180 #else 181 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd); 182 #endif 183 184 static struct address_space_operations yaffs_file_address_operations = { 185 .readpage = yaffs_readpage, 186 .writepage = yaffs_writepage, 187 .prepare_write = yaffs_prepare_write, 188 .commit_write = yaffs_commit_write, 189 }; 190 191 static struct file_operations yaffs_file_operations = { 192 .read = generic_file_read, 193 .write = generic_file_write, 194 .mmap = generic_file_mmap, 195 .flush = yaffs_file_flush, 196 .fsync = yaffs_sync_object, 197 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 198 .sendfile = generic_file_sendfile, 199 #endif 200 201 }; 202 203 static struct inode_operations yaffs_file_inode_operations = { 204 .setattr = yaffs_setattr, 205 }; 206 207 static struct inode_operations yaffs_symlink_inode_operations = { 208 .readlink = yaffs_readlink, 209 .follow_link = yaffs_follow_link, 210 .setattr = yaffs_setattr, 211 }; 212 213 static struct inode_operations yaffs_dir_inode_operations = { 214 .create = yaffs_create, 215 .lookup = yaffs_lookup, 216 .link = yaffs_link, 217 .unlink = yaffs_unlink, 218 .symlink = yaffs_symlink, 219 .mkdir = yaffs_mkdir, 220 .rmdir = yaffs_unlink, 221 .mknod = yaffs_mknod, 222 .rename = yaffs_rename, 223 .setattr = yaffs_setattr, 224 }; 225 226 static struct file_operations yaffs_dir_operations = { 227 .read = generic_read_dir, 228 .readdir = yaffs_readdir, 229 .fsync = yaffs_sync_object, 230 }; 231 232 static struct super_operations yaffs_super_ops = { 233 .statfs = yaffs_statfs, 234 .read_inode = yaffs_read_inode, 235 .put_inode = yaffs_put_inode, 236 .put_super = yaffs_put_super, 237 .delete_inode = yaffs_delete_inode, 238 .clear_inode = yaffs_clear_inode, 239 .sync_fs = yaffs_sync_fs, 240 .write_super = yaffs_write_super, 241 }; 242 243 static void yaffs_GrossLock(yaffs_Device * dev) 244 { 245 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs locking\n")); 246 247 down(&dev->grossLock); 248 } 249 250 static void yaffs_GrossUnlock(yaffs_Device * dev) 251 { 252 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs unlocking\n")); 253 up(&dev->grossLock); 254 255 } 256 257 static int yaffs_readlink(struct dentry *dentry, char __user * buffer, 258 int buflen) 259 { 260 unsigned char *alias; 261 int ret; 262 263 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev; 264 265 yaffs_GrossLock(dev); 266 267 alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry)); 268 269 yaffs_GrossUnlock(dev); 270 271 if (!alias) 272 return -ENOMEM; 273 274 ret = vfs_readlink(dentry, buffer, buflen, alias); 275 kfree(alias); 276 return ret; 277 } 278 279 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13)) 280 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd) 281 #else 282 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd) 283 #endif 284 { 285 unsigned char *alias; 286 int ret; 287 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev; 288 289 yaffs_GrossLock(dev); 290 291 alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry)); 292 293 yaffs_GrossUnlock(dev); 294 295 if (!alias) 296 { 297 ret = -ENOMEM; 298 goto out; 299 } 300 301 ret = vfs_follow_link(nd, alias); 302 kfree(alias); 303 out: 304 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13)) 305 return ERR_PTR (ret); 306 #else 307 return ret; 308 #endif 309 } 310 311 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, 312 yaffs_Object * obj); 313 314 /* 315 * Lookup is used to find objects in the fs 316 */ 317 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 318 319 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, 320 struct nameidata *n) 321 #else 322 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry) 323 #endif 324 { 325 yaffs_Object *obj; 326 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */ 327 328 yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev; 329 330 yaffs_GrossLock(dev); 331 332 T(YAFFS_TRACE_OS, 333 (KERN_DEBUG "yaffs_lookup for %d:%s\n", 334 yaffs_InodeToObject(dir)->objectId, dentry->d_name.name)); 335 336 obj = 337 yaffs_FindObjectByName(yaffs_InodeToObject(dir), 338 dentry->d_name.name); 339 340 obj = yaffs_GetEquivalentObject(obj); /* in case it was a hardlink */ 341 342 /* Can't hold gross lock when calling yaffs_get_inode() */ 343 yaffs_GrossUnlock(dev); 344 345 if (obj) { 346 T(YAFFS_TRACE_OS, 347 (KERN_DEBUG "yaffs_lookup found %d\n", obj->objectId)); 348 349 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); 350 351 if (inode) { 352 T(YAFFS_TRACE_OS, 353 (KERN_DEBUG "yaffs_loookup dentry \n")); 354 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to 355 * d_add even if NULL inode */ 356 #if 0 357 /*dget(dentry); // try to solve directory bug */ 358 d_add(dentry, inode); 359 360 /* return dentry; */ 361 return NULL; 362 #endif 363 } 364 365 } else { 366 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_lookup not found\n")); 367 368 } 369 370 /* added NCB for 2.5/6 compatability - forces add even if inode is 371 * NULL which creates dentry hash */ 372 d_add(dentry, inode); 373 374 return NULL; 375 /* return (ERR_PTR(-EIO)); */ 376 377 } 378 379 /* For now put inode is just for debugging 380 * Put inode is called when the inode **structure** is put. 381 */ 382 static void yaffs_put_inode(struct inode *inode) 383 { 384 T(YAFFS_TRACE_OS, 385 ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino, 386 atomic_read(&inode->i_count))); 387 388 } 389 390 /* clear is called to tell the fs to release any per-inode data it holds */ 391 static void yaffs_clear_inode(struct inode *inode) 392 { 393 yaffs_Object *obj; 394 yaffs_Device *dev; 395 396 obj = yaffs_InodeToObject(inode); 397 398 T(YAFFS_TRACE_OS, 399 ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino, 400 atomic_read(&inode->i_count), 401 obj ? "object exists" : "null object")); 402 403 if (obj) { 404 dev = obj->myDev; 405 yaffs_GrossLock(dev); 406 407 /* Clear the association between the inode and 408 * the yaffs_Object. 409 */ 410 obj->myInode = NULL; 411 inode->u.generic_ip = NULL; 412 413 /* If the object freeing was deferred, then the real 414 * free happens now. 415 * This should fix the inode inconsistency problem. 416 */ 417 418 yaffs_HandleDeferedFree(obj); 419 420 yaffs_GrossUnlock(dev); 421 } 422 423 } 424 425 /* delete is called when the link count is zero and the inode 426 * is put (ie. nobody wants to know about it anymore, time to 427 * delete the file). 428 * NB Must call clear_inode() 429 */ 430 static void yaffs_delete_inode(struct inode *inode) 431 { 432 yaffs_Object *obj = yaffs_InodeToObject(inode); 433 yaffs_Device *dev; 434 435 T(YAFFS_TRACE_OS, 436 ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino, 437 atomic_read(&inode->i_count), 438 obj ? "object exists" : "null object")); 439 440 if (obj) { 441 dev = obj->myDev; 442 yaffs_GrossLock(dev); 443 yaffs_DeleteFile(obj); 444 yaffs_GrossUnlock(dev); 445 } 446 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13)) 447 truncate_inode_pages (&inode->i_data, 0); 448 #endif 449 clear_inode(inode); 450 } 451 452 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 453 static int yaffs_file_flush(struct file *file, fl_owner_t id) 454 #else 455 static int yaffs_file_flush(struct file *file) 456 #endif 457 { 458 yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry); 459 460 yaffs_Device *dev = obj->myDev; 461 462 T(YAFFS_TRACE_OS, 463 (KERN_DEBUG "yaffs_file_flush object %d (%s)\n", obj->objectId, 464 obj->dirty ? "dirty" : "clean")); 465 466 yaffs_GrossLock(dev); 467 468 yaffs_FlushFile(obj, 1); 469 470 yaffs_GrossUnlock(dev); 471 472 return 0; 473 } 474 475 static int yaffs_readpage_nolock(struct file *f, struct page *pg) 476 { 477 /* Lifted from jffs2 */ 478 479 yaffs_Object *obj; 480 unsigned char *pg_buf; 481 int ret; 482 483 yaffs_Device *dev; 484 485 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage at %08x, size %08x\n", 486 (unsigned)(pg->index << PAGE_CACHE_SHIFT), 487 (unsigned)PAGE_CACHE_SIZE)); 488 489 obj = yaffs_DentryToObject(f->f_dentry); 490 491 dev = obj->myDev; 492 493 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 494 BUG_ON(!PageLocked(pg)); 495 #else 496 if (!PageLocked(pg)) 497 PAGE_BUG(pg); 498 #endif 499 500 pg_buf = kmap(pg); 501 /* FIXME: Can kmap fail? */ 502 503 yaffs_GrossLock(dev); 504 505 ret = 506 yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, 507 PAGE_CACHE_SIZE); 508 509 yaffs_GrossUnlock(dev); 510 511 if (ret >= 0) 512 ret = 0; 513 514 if (ret) { 515 ClearPageUptodate(pg); 516 SetPageError(pg); 517 } else { 518 SetPageUptodate(pg); 519 ClearPageError(pg); 520 } 521 522 flush_dcache_page(pg); 523 kunmap(pg); 524 525 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage done\n")); 526 return ret; 527 } 528 529 static int yaffs_readpage_unlock(struct file *f, struct page *pg) 530 { 531 int ret = yaffs_readpage_nolock(f, pg); 532 UnlockPage(pg); 533 return ret; 534 } 535 536 static int yaffs_readpage(struct file *f, struct page *pg) 537 { 538 return yaffs_readpage_unlock(f, pg); 539 } 540 541 /* writepage inspired by/stolen from smbfs */ 542 543 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 544 static int yaffs_writepage(struct page *page, struct writeback_control *wbc) 545 #else 546 static int yaffs_writepage(struct page *page) 547 #endif 548 { 549 struct address_space *mapping = page->mapping; 550 loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT; 551 struct inode *inode; 552 unsigned long end_index; 553 char *buffer; 554 yaffs_Object *obj; 555 int nWritten = 0; 556 unsigned nBytes; 557 558 if (!mapping) 559 BUG(); 560 inode = mapping->host; 561 if (!inode) 562 BUG(); 563 564 if (offset > inode->i_size) { 565 T(YAFFS_TRACE_OS, 566 (KERN_DEBUG 567 "yaffs_writepage at %08x, inode size = %08x!!!\n", 568 (unsigned)(page->index << PAGE_CACHE_SHIFT), 569 (unsigned)inode->i_size)); 570 T(YAFFS_TRACE_OS, 571 (KERN_DEBUG " -> don't care!!\n")); 572 unlock_page(page); 573 return 0; 574 } 575 576 end_index = inode->i_size >> PAGE_CACHE_SHIFT; 577 578 /* easy case */ 579 if (page->index < end_index) { 580 nBytes = PAGE_CACHE_SIZE; 581 } else { 582 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1); 583 } 584 585 get_page(page); 586 587 buffer = kmap(page); 588 589 obj = yaffs_InodeToObject(inode); 590 yaffs_GrossLock(obj->myDev); 591 592 T(YAFFS_TRACE_OS, 593 (KERN_DEBUG "yaffs_writepage at %08x, size %08x\n", 594 (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes)); 595 T(YAFFS_TRACE_OS, 596 (KERN_DEBUG "writepag0: obj = %05x, ino = %05x\n", 597 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size)); 598 599 nWritten = 600 yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT, 601 nBytes, 0); 602 603 T(YAFFS_TRACE_OS, 604 (KERN_DEBUG "writepag1: obj = %05x, ino = %05x\n", 605 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size)); 606 607 yaffs_GrossUnlock(obj->myDev); 608 609 kunmap(page); 610 SetPageUptodate(page); 611 UnlockPage(page); 612 put_page(page); 613 614 return (nWritten == nBytes) ? 0 : -ENOSPC; 615 } 616 617 static int yaffs_prepare_write(struct file *f, struct page *pg, 618 unsigned offset, unsigned to) 619 { 620 621 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n")); 622 if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE)) 623 return yaffs_readpage_nolock(f, pg); 624 625 return 0; 626 627 } 628 629 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, 630 unsigned to) 631 { 632 633 void *addr = page_address(pg) + offset; 634 loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset; 635 int nBytes = to - offset; 636 int nWritten; 637 638 unsigned spos = pos; 639 unsigned saddr = (unsigned)addr; 640 641 T(YAFFS_TRACE_OS, 642 (KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr, 643 spos, nBytes)); 644 645 nWritten = yaffs_file_write(f, addr, nBytes, &pos); 646 647 if (nWritten != nBytes) { 648 T(YAFFS_TRACE_OS, 649 (KERN_DEBUG 650 "yaffs_commit_write not same size nWritten %d nBytes %d\n", 651 nWritten, nBytes)); 652 SetPageError(pg); 653 ClearPageUptodate(pg); 654 } else { 655 SetPageUptodate(pg); 656 } 657 658 T(YAFFS_TRACE_OS, 659 (KERN_DEBUG "yaffs_commit_write returning %d\n", 660 nWritten == nBytes ? 0 : nWritten)); 661 662 return nWritten == nBytes ? 0 : nWritten; 663 664 } 665 666 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj) 667 { 668 if (inode && obj) { 669 670 671 /* Check mode against the variant type and attempt to repair if broken. */ 672 __u32 mode = obj->yst_mode; 673 switch( obj->variantType ){ 674 case YAFFS_OBJECT_TYPE_FILE : 675 if( ! S_ISREG(mode) ){ 676 obj->yst_mode &= ~S_IFMT; 677 obj->yst_mode |= S_IFREG; 678 } 679 680 break; 681 case YAFFS_OBJECT_TYPE_SYMLINK : 682 if( ! S_ISLNK(mode) ){ 683 obj->yst_mode &= ~S_IFMT; 684 obj->yst_mode |= S_IFLNK; 685 } 686 687 break; 688 case YAFFS_OBJECT_TYPE_DIRECTORY : 689 if( ! S_ISDIR(mode) ){ 690 obj->yst_mode &= ~S_IFMT; 691 obj->yst_mode |= S_IFDIR; 692 } 693 694 break; 695 case YAFFS_OBJECT_TYPE_UNKNOWN : 696 case YAFFS_OBJECT_TYPE_HARDLINK : 697 case YAFFS_OBJECT_TYPE_SPECIAL : 698 default: 699 /* TODO? */ 700 break; 701 } 702 703 inode->i_ino = obj->objectId; 704 inode->i_mode = obj->yst_mode; 705 inode->i_uid = obj->yst_uid; 706 inode->i_gid = obj->yst_gid; 707 inode->i_blksize = inode->i_sb->s_blocksize; 708 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 709 710 inode->i_rdev = old_decode_dev(obj->yst_rdev); 711 inode->i_atime.tv_sec = (time_t) (obj->yst_atime); 712 inode->i_atime.tv_nsec = 0; 713 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime; 714 inode->i_mtime.tv_nsec = 0; 715 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime; 716 inode->i_ctime.tv_nsec = 0; 717 #else 718 inode->i_rdev = obj->yst_rdev; 719 inode->i_atime = obj->yst_atime; 720 inode->i_mtime = obj->yst_mtime; 721 inode->i_ctime = obj->yst_ctime; 722 #endif 723 inode->i_size = yaffs_GetObjectFileLength(obj); 724 inode->i_blocks = (inode->i_size + 511) >> 9; 725 726 inode->i_nlink = yaffs_GetObjectLinkCount(obj); 727 728 T(YAFFS_TRACE_OS, 729 (KERN_DEBUG 730 "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n", 731 inode->i_mode, inode->i_uid, inode->i_gid, 732 (int)inode->i_size, atomic_read(&inode->i_count))); 733 734 switch (obj->yst_mode & S_IFMT) { 735 default: /* fifo, device or socket */ 736 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 737 init_special_inode(inode, obj->yst_mode, 738 old_decode_dev(obj->yst_rdev)); 739 #else 740 init_special_inode(inode, obj->yst_mode, 741 (dev_t) (obj->yst_rdev)); 742 #endif 743 break; 744 case S_IFREG: /* file */ 745 inode->i_op = &yaffs_file_inode_operations; 746 inode->i_fop = &yaffs_file_operations; 747 inode->i_mapping->a_ops = 748 &yaffs_file_address_operations; 749 break; 750 case S_IFDIR: /* directory */ 751 inode->i_op = &yaffs_dir_inode_operations; 752 inode->i_fop = &yaffs_dir_operations; 753 break; 754 case S_IFLNK: /* symlink */ 755 inode->i_op = &yaffs_symlink_inode_operations; 756 break; 757 } 758 759 inode->u.generic_ip = obj; 760 obj->myInode = inode; 761 762 } else { 763 T(YAFFS_TRACE_OS, 764 (KERN_DEBUG "yaffs_FileInode invalid parameters\n")); 765 } 766 767 } 768 769 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, 770 yaffs_Object * obj) 771 { 772 struct inode *inode; 773 774 if (!sb) { 775 T(YAFFS_TRACE_OS, 776 (KERN_DEBUG "yaffs_get_inode for NULL super_block!!\n")); 777 return NULL; 778 779 } 780 781 if (!obj) { 782 T(YAFFS_TRACE_OS, 783 (KERN_DEBUG "yaffs_get_inode for NULL object!!\n")); 784 return NULL; 785 786 } 787 788 T(YAFFS_TRACE_OS, 789 (KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId)); 790 791 inode = iget(sb, obj->objectId); 792 793 /* NB Side effect: iget calls back to yaffs_read_inode(). */ 794 /* iget also increments the inode's i_count */ 795 /* NB You can't be holding grossLock or deadlock will happen! */ 796 797 return inode; 798 } 799 800 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, 801 loff_t * pos) 802 { 803 yaffs_Object *obj; 804 int nWritten, ipos; 805 struct inode *inode; 806 yaffs_Device *dev; 807 808 obj = yaffs_DentryToObject(f->f_dentry); 809 810 dev = obj->myDev; 811 812 yaffs_GrossLock(dev); 813 814 inode = f->f_dentry->d_inode; 815 816 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) { 817 ipos = inode->i_size; 818 } else { 819 ipos = *pos; 820 } 821 822 if (!obj) { 823 T(YAFFS_TRACE_OS, 824 (KERN_DEBUG "yaffs_file_write: hey obj is null!\n")); 825 } else { 826 T(YAFFS_TRACE_OS, 827 (KERN_DEBUG 828 "yaffs_file_write about to write writing %d bytes" 829 "to object %d at %d\n", 830 n, obj->objectId, ipos)); 831 } 832 833 nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0); 834 835 T(YAFFS_TRACE_OS, 836 (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n", 837 n, nWritten, ipos)); 838 if (nWritten > 0) { 839 ipos += nWritten; 840 *pos = ipos; 841 if (ipos > inode->i_size) { 842 inode->i_size = ipos; 843 inode->i_blocks = (ipos + 511) >> 9; 844 845 T(YAFFS_TRACE_OS, 846 (KERN_DEBUG 847 "yaffs_file_write size updated to %d bytes, " 848 "%d blocks\n", 849 ipos, (int)(inode->i_blocks))); 850 } 851 852 } 853 yaffs_GrossUnlock(dev); 854 return nWritten == 0 ? -ENOSPC : nWritten; 855 } 856 857 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) 858 { 859 yaffs_Object *obj; 860 yaffs_Device *dev; 861 struct inode *inode = f->f_dentry->d_inode; 862 unsigned long offset, curoffs; 863 struct list_head *i; 864 yaffs_Object *l; 865 866 char name[YAFFS_MAX_NAME_LENGTH + 1]; 867 868 obj = yaffs_DentryToObject(f->f_dentry); 869 dev = obj->myDev; 870 871 yaffs_GrossLock(dev); 872 873 offset = f->f_pos; 874 875 T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset)); 876 877 if (offset == 0) { 878 T(YAFFS_TRACE_OS, 879 (KERN_DEBUG "yaffs_readdir: entry . ino %d \n", 880 (int)inode->i_ino)); 881 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) 882 < 0) { 883 goto out; 884 } 885 offset++; 886 f->f_pos++; 887 } 888 if (offset == 1) { 889 T(YAFFS_TRACE_OS, 890 (KERN_DEBUG "yaffs_readdir: entry .. ino %d \n", 891 (int)f->f_dentry->d_parent->d_inode->i_ino)); 892 if (filldir 893 (dirent, "..", 2, offset, 894 f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) { 895 goto out; 896 } 897 offset++; 898 f->f_pos++; 899 } 900 901 curoffs = 1; 902 903 /* If the directory has changed since the open or last call to 904 readdir, rewind to after the 2 canned entries. */ 905 906 if (f->f_version != inode->i_version) { 907 offset = 2; 908 f->f_pos = offset; 909 f->f_version = inode->i_version; 910 } 911 912 list_for_each(i, &obj->variant.directoryVariant.children) { 913 curoffs++; 914 if (curoffs >= offset) { 915 l = list_entry(i, yaffs_Object, siblings); 916 917 yaffs_GetObjectName(l, name, 918 YAFFS_MAX_NAME_LENGTH + 1); 919 T(YAFFS_TRACE_OS, 920 (KERN_DEBUG "yaffs_readdir: %s inode %d\n", name, 921 yaffs_GetObjectInode(l))); 922 923 if (filldir(dirent, 924 name, 925 strlen(name), 926 offset, 927 yaffs_GetObjectInode(l), 928 yaffs_GetObjectType(l)) 929 < 0) { 930 goto up_and_out; 931 } 932 933 offset++; 934 f->f_pos++; 935 } 936 } 937 938 up_and_out: 939 out: 940 941 yaffs_GrossUnlock(dev); 942 943 return 0; 944 } 945 946 /* 947 * File creation. Allocate an inode, and we're done.. 948 */ 949 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 950 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, 951 dev_t rdev) 952 #else 953 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, 954 int rdev) 955 #endif 956 { 957 struct inode *inode; 958 959 yaffs_Object *obj = NULL; 960 yaffs_Device *dev; 961 962 yaffs_Object *parent = yaffs_InodeToObject(dir); 963 964 int error = -ENOSPC; 965 uid_t uid = current->fsuid; 966 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid; 967 968 if((dir->i_mode & S_ISGID) && S_ISDIR(mode)) 969 mode |= S_ISGID; 970 971 if (parent) { 972 T(YAFFS_TRACE_OS, 973 (KERN_DEBUG "yaffs_mknod: parent object %d type %d\n", 974 parent->objectId, parent->variantType)); 975 } else { 976 T(YAFFS_TRACE_OS, 977 (KERN_DEBUG "yaffs_mknod: could not get parent object\n")); 978 return -EPERM; 979 } 980 981 T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, " 982 "mode %x dev %x\n", 983 dentry->d_name.name, mode, rdev)); 984 985 dev = parent->myDev; 986 987 yaffs_GrossLock(dev); 988 989 switch (mode & S_IFMT) { 990 default: 991 /* Special (socket, fifo, device...) */ 992 T(YAFFS_TRACE_OS, (KERN_DEBUG 993 "yaffs_mknod: making special\n")); 994 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 995 obj = 996 yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid, 997 gid, old_encode_dev(rdev)); 998 #else 999 obj = 1000 yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid, 1001 gid, rdev); 1002 #endif 1003 break; 1004 case S_IFREG: /* file */ 1005 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n")); 1006 obj = 1007 yaffs_MknodFile(parent, dentry->d_name.name, mode, uid, 1008 gid); 1009 break; 1010 case S_IFDIR: /* directory */ 1011 T(YAFFS_TRACE_OS, 1012 (KERN_DEBUG "yaffs_mknod: making directory\n")); 1013 obj = 1014 yaffs_MknodDirectory(parent, dentry->d_name.name, mode, 1015 uid, gid); 1016 break; 1017 case S_IFLNK: /* symlink */ 1018 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n")); 1019 obj = NULL; /* Do we ever get here? */ 1020 break; 1021 } 1022 1023 /* Can not call yaffs_get_inode() with gross lock held */ 1024 yaffs_GrossUnlock(dev); 1025 1026 if (obj) { 1027 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj); 1028 d_instantiate(dentry, inode); 1029 T(YAFFS_TRACE_OS, 1030 (KERN_DEBUG "yaffs_mknod created object %d count = %d\n", 1031 obj->objectId, atomic_read(&inode->i_count))); 1032 error = 0; 1033 } else { 1034 T(YAFFS_TRACE_OS, 1035 (KERN_DEBUG "yaffs_mknod failed making object\n")); 1036 error = -ENOMEM; 1037 } 1038 1039 return error; 1040 } 1041 1042 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 1043 { 1044 int retVal; 1045 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mkdir\n")); 1046 retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0); 1047 #if 0 1048 /* attempt to fix dir bug - didn't work */ 1049 if (!retVal) { 1050 dget(dentry); 1051 } 1052 #endif 1053 return retVal; 1054 } 1055 1056 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 1057 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, 1058 struct nameidata *n) 1059 #else 1060 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode) 1061 #endif 1062 { 1063 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_create\n")); 1064 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0); 1065 } 1066 1067 static int yaffs_unlink(struct inode *dir, struct dentry *dentry) 1068 { 1069 int retVal; 1070 1071 yaffs_Device *dev; 1072 1073 T(YAFFS_TRACE_OS, 1074 (KERN_DEBUG "yaffs_unlink %d:%s\n", (int)(dir->i_ino), 1075 dentry->d_name.name)); 1076 1077 dev = yaffs_InodeToObject(dir)->myDev; 1078 1079 yaffs_GrossLock(dev); 1080 1081 retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name); 1082 1083 if (retVal == YAFFS_OK) { 1084 dentry->d_inode->i_nlink--; 1085 dir->i_version++; 1086 yaffs_GrossUnlock(dev); 1087 mark_inode_dirty(dentry->d_inode); 1088 return 0; 1089 } 1090 yaffs_GrossUnlock(dev); 1091 return -ENOTEMPTY; 1092 } 1093 1094 /* 1095 * Create a link... 1096 */ 1097 static int yaffs_link(struct dentry *old_dentry, struct inode *dir, 1098 struct dentry *dentry) 1099 { 1100 struct inode *inode = old_dentry->d_inode; 1101 yaffs_Object *obj = NULL; 1102 yaffs_Object *link = NULL; 1103 yaffs_Device *dev; 1104 1105 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_link\n")); 1106 1107 obj = yaffs_InodeToObject(inode); 1108 dev = obj->myDev; 1109 1110 yaffs_GrossLock(dev); 1111 1112 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */ 1113 { 1114 link = 1115 yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name, 1116 obj); 1117 } 1118 1119 if (link) { 1120 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj); 1121 d_instantiate(dentry, old_dentry->d_inode); 1122 atomic_inc(&old_dentry->d_inode->i_count); 1123 T(YAFFS_TRACE_OS, 1124 (KERN_DEBUG "yaffs_link link count %d i_count %d\n", 1125 old_dentry->d_inode->i_nlink, 1126 atomic_read(&old_dentry->d_inode->i_count))); 1127 1128 } 1129 1130 yaffs_GrossUnlock(dev); 1131 1132 if (link) { 1133 1134 return 0; 1135 } 1136 1137 return -EPERM; 1138 } 1139 1140 static int yaffs_symlink(struct inode *dir, struct dentry *dentry, 1141 const char *symname) 1142 { 1143 yaffs_Object *obj; 1144 yaffs_Device *dev; 1145 uid_t uid = current->fsuid; 1146 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid; 1147 1148 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_symlink\n")); 1149 1150 dev = yaffs_InodeToObject(dir)->myDev; 1151 yaffs_GrossLock(dev); 1152 obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name, 1153 S_IFLNK | S_IRWXUGO, uid, gid, symname); 1154 yaffs_GrossUnlock(dev); 1155 1156 if (obj) { 1157 1158 struct inode *inode; 1159 1160 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); 1161 d_instantiate(dentry, inode); 1162 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink created OK\n")); 1163 return 0; 1164 } else { 1165 T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink not created\n")); 1166 1167 } 1168 1169 return -ENOMEM; 1170 } 1171 1172 static int yaffs_sync_object(struct file *file, struct dentry *dentry, 1173 int datasync) 1174 { 1175 1176 yaffs_Object *obj; 1177 yaffs_Device *dev; 1178 1179 obj = yaffs_DentryToObject(dentry); 1180 1181 dev = obj->myDev; 1182 1183 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_object\n")); 1184 yaffs_GrossLock(dev); 1185 yaffs_FlushFile(obj, 1); 1186 yaffs_GrossUnlock(dev); 1187 return 0; 1188 } 1189 1190 /* 1191 * The VFS layer already does all the dentry stuff for rename. 1192 * 1193 * NB: POSIX says you can rename an object over an old object of the same name 1194 */ 1195 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry, 1196 struct inode *new_dir, struct dentry *new_dentry) 1197 { 1198 yaffs_Device *dev; 1199 int retVal = YAFFS_FAIL; 1200 yaffs_Object *target; 1201 1202 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_rename\n")); 1203 dev = yaffs_InodeToObject(old_dir)->myDev; 1204 1205 yaffs_GrossLock(dev); 1206 1207 /* Check if the target is an existing directory that is not empty. */ 1208 target = 1209 yaffs_FindObjectByName(yaffs_InodeToObject(new_dir), 1210 new_dentry->d_name.name); 1211 1212 1213 1214 if (target && 1215 target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY && 1216 !list_empty(&target->variant.directoryVariant.children)) { 1217 1218 T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n")); 1219 1220 retVal = YAFFS_FAIL; 1221 } else { 1222 1223 /* Now does unlinking internally using shadowing mechanism */ 1224 T(YAFFS_TRACE_OS, (KERN_DEBUG "calling yaffs_RenameObject\n")); 1225 1226 retVal = 1227 yaffs_RenameObject(yaffs_InodeToObject(old_dir), 1228 old_dentry->d_name.name, 1229 yaffs_InodeToObject(new_dir), 1230 new_dentry->d_name.name); 1231 1232 } 1233 yaffs_GrossUnlock(dev); 1234 1235 if (retVal == YAFFS_OK) { 1236 if(target) { 1237 new_dentry->d_inode->i_nlink--; 1238 mark_inode_dirty(new_dentry->d_inode); 1239 } 1240 1241 return 0; 1242 } else { 1243 return -ENOTEMPTY; 1244 } 1245 1246 } 1247 1248 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr) 1249 { 1250 struct inode *inode = dentry->d_inode; 1251 int error; 1252 yaffs_Device *dev; 1253 1254 T(YAFFS_TRACE_OS, 1255 (KERN_DEBUG "yaffs_setattr of object %d\n", 1256 yaffs_InodeToObject(inode)->objectId)); 1257 1258 if ((error = inode_change_ok(inode, attr)) == 0) { 1259 1260 dev = yaffs_InodeToObject(inode)->myDev; 1261 yaffs_GrossLock(dev); 1262 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) == 1263 YAFFS_OK) { 1264 error = 0; 1265 } else { 1266 error = -EPERM; 1267 } 1268 yaffs_GrossUnlock(dev); 1269 if (!error) 1270 error = inode_setattr(inode, attr); 1271 } 1272 return error; 1273 } 1274 1275 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1276 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf) 1277 { 1278 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev; 1279 struct super_block *sb = dentry->d_sb; 1280 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 1281 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf) 1282 { 1283 yaffs_Device *dev = yaffs_SuperToDevice(sb); 1284 #else 1285 static int yaffs_statfs(struct super_block *sb, struct statfs *buf) 1286 { 1287 yaffs_Device *dev = yaffs_SuperToDevice(sb); 1288 #endif 1289 1290 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_statfs\n")); 1291 1292 yaffs_GrossLock(dev); 1293 1294 buf->f_type = YAFFS_MAGIC; 1295 buf->f_bsize = sb->s_blocksize; 1296 buf->f_namelen = 255; 1297 if (sb->s_blocksize > dev->nDataBytesPerChunk) { 1298 1299 buf->f_blocks = 1300 (dev->endBlock - dev->startBlock + 1301 1) * dev->nChunksPerBlock / (sb->s_blocksize / 1302 dev->nDataBytesPerChunk); 1303 buf->f_bfree = 1304 yaffs_GetNumberOfFreeChunks(dev) / (sb->s_blocksize / 1305 dev->nDataBytesPerChunk); 1306 } else { 1307 1308 buf->f_blocks = 1309 (dev->endBlock - dev->startBlock + 1310 1) * dev->nChunksPerBlock * (dev->nDataBytesPerChunk / 1311 sb->s_blocksize); 1312 buf->f_bfree = 1313 yaffs_GetNumberOfFreeChunks(dev) * (dev->nDataBytesPerChunk / 1314 sb->s_blocksize); 1315 } 1316 buf->f_files = 0; 1317 buf->f_ffree = 0; 1318 buf->f_bavail = buf->f_bfree; 1319 1320 yaffs_GrossUnlock(dev); 1321 return 0; 1322 } 1323 1324 1325 1326 static int yaffs_do_sync_fs(struct super_block *sb) 1327 { 1328 1329 yaffs_Device *dev = yaffs_SuperToDevice(sb); 1330 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_do_sync_fs\n")); 1331 1332 if(sb->s_dirt) { 1333 yaffs_GrossLock(dev); 1334 1335 if(dev) 1336 yaffs_CheckpointSave(dev); 1337 1338 yaffs_GrossUnlock(dev); 1339 1340 sb->s_dirt = 0; 1341 } 1342 return 0; 1343 } 1344 1345 1346 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1347 static void yaffs_write_super(struct super_block *sb) 1348 #else 1349 static int yaffs_write_super(struct super_block *sb) 1350 #endif 1351 { 1352 1353 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n")); 1354 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)) 1355 return 0; /* yaffs_do_sync_fs(sb);*/ 1356 #endif 1357 } 1358 1359 1360 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1361 static int yaffs_sync_fs(struct super_block *sb, int wait) 1362 #else 1363 static int yaffs_sync_fs(struct super_block *sb) 1364 #endif 1365 { 1366 1367 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n")); 1368 1369 return 0; /* yaffs_do_sync_fs(sb);*/ 1370 1371 } 1372 1373 1374 static void yaffs_read_inode(struct inode *inode) 1375 { 1376 /* NB This is called as a side effect of other functions, but 1377 * we had to release the lock to prevent deadlocks, so 1378 * need to lock again. 1379 */ 1380 1381 yaffs_Object *obj; 1382 yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb); 1383 1384 T(YAFFS_TRACE_OS, 1385 (KERN_DEBUG "yaffs_read_inode for %d\n", (int)inode->i_ino)); 1386 1387 yaffs_GrossLock(dev); 1388 1389 obj = yaffs_FindObjectByNumber(dev, inode->i_ino); 1390 1391 yaffs_FillInodeFromObject(inode, obj); 1392 1393 yaffs_GrossUnlock(dev); 1394 } 1395 1396 static LIST_HEAD(yaffs_dev_list); 1397 1398 static void yaffs_put_super(struct super_block *sb) 1399 { 1400 yaffs_Device *dev = yaffs_SuperToDevice(sb); 1401 1402 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_put_super\n")); 1403 1404 yaffs_GrossLock(dev); 1405 1406 yaffs_FlushEntireDeviceCache(dev); 1407 1408 if (dev->putSuperFunc) { 1409 dev->putSuperFunc(sb); 1410 } 1411 1412 yaffs_CheckpointSave(dev); 1413 yaffs_Deinitialise(dev); 1414 1415 yaffs_GrossUnlock(dev); 1416 1417 /* we assume this is protected by lock_kernel() in mount/umount */ 1418 list_del(&dev->devList); 1419 1420 if(dev->spareBuffer){ 1421 YFREE(dev->spareBuffer); 1422 dev->spareBuffer = NULL; 1423 } 1424 1425 kfree(dev); 1426 } 1427 1428 1429 static void yaffs_MTDPutSuper(struct super_block *sb) 1430 { 1431 1432 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice; 1433 1434 if (mtd->sync) { 1435 mtd->sync(mtd); 1436 } 1437 1438 put_mtd_device(mtd); 1439 } 1440 1441 1442 static void yaffs_MarkSuperBlockDirty(void *vsb) 1443 { 1444 struct super_block *sb = (struct super_block *)vsb; 1445 1446 T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_MarkSuperBlockDirty() sb = %p\n",sb)); 1447 // if(sb) 1448 // sb->s_dirt = 1; 1449 } 1450 1451 static struct super_block *yaffs_internal_read_super(int yaffsVersion, 1452 struct super_block *sb, 1453 void *data, int silent) 1454 { 1455 int nBlocks; 1456 struct inode *inode = NULL; 1457 struct dentry *root; 1458 yaffs_Device *dev = 0; 1459 char devname_buf[BDEVNAME_SIZE + 1]; 1460 struct mtd_info *mtd; 1461 int err; 1462 1463 sb->s_magic = YAFFS_MAGIC; 1464 sb->s_op = &yaffs_super_ops; 1465 1466 if (!sb) 1467 printk(KERN_INFO "yaffs: sb is NULL\n"); 1468 else if (!sb->s_dev) 1469 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n"); 1470 else if (!yaffs_devname(sb, devname_buf)) 1471 printk(KERN_INFO "yaffs: devname is NULL\n"); 1472 else 1473 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n", 1474 sb->s_dev, 1475 yaffs_devname(sb, devname_buf)); 1476 1477 sb->s_blocksize = PAGE_CACHE_SIZE; 1478 sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 1479 T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion)); 1480 T(YAFFS_TRACE_OS, 1481 ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize))); 1482 1483 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY 1484 T(YAFFS_TRACE_OS, 1485 ("yaffs: Write verification disabled. All guarantees " 1486 "null and void\n")); 1487 #endif 1488 1489 T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, " 1490 "\"%s\"\n", 1491 MAJOR(sb->s_dev), MINOR(sb->s_dev), 1492 yaffs_devname(sb, devname_buf))); 1493 1494 /* Check it's an mtd device..... */ 1495 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) { 1496 return NULL; /* This isn't an mtd device */ 1497 } 1498 /* Get the device */ 1499 mtd = get_mtd_device(NULL, MINOR(sb->s_dev)); 1500 if (!mtd) { 1501 T(YAFFS_TRACE_ALWAYS, 1502 ("yaffs: MTD device #%u doesn't appear to exist\n", 1503 MINOR(sb->s_dev))); 1504 return NULL; 1505 } 1506 /* Check it's NAND */ 1507 if (mtd->type != MTD_NANDFLASH) { 1508 T(YAFFS_TRACE_ALWAYS, 1509 ("yaffs: MTD device is not NAND it's type %d\n", mtd->type)); 1510 return NULL; 1511 } 1512 1513 T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase)); 1514 T(YAFFS_TRACE_OS, (" read %p\n", mtd->read)); 1515 T(YAFFS_TRACE_OS, (" write %p\n", mtd->write)); 1516 T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob)); 1517 T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob)); 1518 T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad)); 1519 T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad)); 1520 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1521 T(YAFFS_TRACE_OS, (" writesize %d\n", mtd->writesize)); 1522 #else 1523 T(YAFFS_TRACE_OS, (" oobblock %d\n", mtd->oobblock)); 1524 #endif 1525 T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize)); 1526 T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize)); 1527 T(YAFFS_TRACE_OS, (" size %d\n", mtd->size)); 1528 1529 #ifdef CONFIG_YAFFS_AUTO_YAFFS2 1530 1531 if (yaffsVersion == 1 && 1532 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1533 mtd->writesize >= 2048) { 1534 #else 1535 mtd->oobblock >= 2048) { 1536 #endif 1537 T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n")); 1538 yaffsVersion = 2; 1539 } 1540 1541 /* Added NCB 26/5/2006 for completeness */ 1542 if (yaffsVersion == 2 && 1543 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1544 mtd->writesize == 512) { 1545 #else 1546 mtd->oobblock >= 512) { 1547 #endif 1548 T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs1\n")); 1549 yaffsVersion = 1; 1550 } 1551 1552 #endif 1553 1554 if (yaffsVersion == 2) { 1555 /* Check for version 2 style functions */ 1556 if (!mtd->erase || 1557 !mtd->block_isbad || 1558 !mtd->block_markbad || 1559 !mtd->read || 1560 !mtd->write || 1561 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1562 !mtd->read_oob || !mtd->write_oob) { 1563 #else 1564 !mtd->write_ecc || 1565 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) { 1566 #endif 1567 T(YAFFS_TRACE_ALWAYS, 1568 ("yaffs: MTD device does not support required " 1569 "functions\n"));; 1570 return NULL; 1571 } 1572 1573 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1574 if (mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE || 1575 #else 1576 if (mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE || 1577 #endif 1578 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) { 1579 T(YAFFS_TRACE_ALWAYS, 1580 ("yaffs: MTD device does not have the " 1581 "right page sizes\n")); 1582 return NULL; 1583 } 1584 } else { 1585 /* Check for V1 style functions */ 1586 if (!mtd->erase || 1587 !mtd->read || 1588 !mtd->write || 1589 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1590 !mtd->read_oob || !mtd->write_oob) { 1591 #else 1592 !mtd->write_ecc || 1593 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) { 1594 #endif 1595 T(YAFFS_TRACE_ALWAYS, 1596 ("yaffs: MTD device does not support required " 1597 "functions\n"));; 1598 return NULL; 1599 } 1600 1601 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1602 if (mtd->writesize < YAFFS_BYTES_PER_CHUNK || 1603 #else 1604 if (mtd->oobblock < YAFFS_BYTES_PER_CHUNK || 1605 #endif 1606 mtd->oobsize != YAFFS_BYTES_PER_SPARE) { 1607 T(YAFFS_TRACE_ALWAYS, 1608 ("yaffs: MTD device does not support have the " 1609 "right page sizes\n")); 1610 return NULL; 1611 } 1612 } 1613 1614 /* OK, so if we got here, we have an MTD that's NAND and looks 1615 * like it has the right capabilities 1616 * Set the yaffs_Device up for mtd 1617 */ 1618 1619 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 1620 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL); 1621 #else 1622 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL); 1623 #endif 1624 if (!dev) { 1625 /* Deep shit could not allocate device structure */ 1626 T(YAFFS_TRACE_ALWAYS, 1627 ("yaffs_read_super: Failed trying to allocate " 1628 "yaffs_Device. \n")); 1629 return NULL; 1630 } 1631 1632 memset(dev, 0, sizeof(yaffs_Device)); 1633 dev->genericDevice = mtd; 1634 dev->name = mtd->name; 1635 1636 /* Set up the memory size parameters.... */ 1637 1638 nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK); 1639 dev->startBlock = 0; 1640 dev->endBlock = nBlocks - 1; 1641 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK; 1642 dev->nDataBytesPerChunk = YAFFS_BYTES_PER_CHUNK; 1643 dev->nReservedBlocks = 5; 1644 dev->nShortOpCaches = 10; /* Enable short op caching */ 1645 1646 /* ... and the functions. */ 1647 if (yaffsVersion == 2) { 1648 dev->writeChunkWithTagsToNAND = 1649 nandmtd2_WriteChunkWithTagsToNAND; 1650 dev->readChunkWithTagsFromNAND = 1651 nandmtd2_ReadChunkWithTagsFromNAND; 1652 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad; 1653 dev->queryNANDBlock = nandmtd2_QueryNANDBlock; 1654 dev->spareBuffer = YMALLOC(mtd->oobsize); 1655 dev->isYaffs2 = 1; 1656 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1657 dev->nDataBytesPerChunk = mtd->writesize; 1658 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize; 1659 #else 1660 dev->nDataBytesPerChunk = mtd->oobblock; 1661 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock; 1662 #endif 1663 nBlocks = mtd->size / mtd->erasesize; 1664 1665 dev->nCheckpointReservedBlocks = 10; 1666 dev->startBlock = 0; 1667 dev->endBlock = nBlocks - 1; 1668 } else { 1669 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND; 1670 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND; 1671 dev->isYaffs2 = 0; 1672 } 1673 /* ... and common functions */ 1674 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND; 1675 dev->initialiseNAND = nandmtd_InitialiseNAND; 1676 1677 dev->putSuperFunc = yaffs_MTDPutSuper; 1678 1679 dev->superBlock = (void *)sb; 1680 dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty; 1681 1682 1683 #ifndef CONFIG_YAFFS_DOES_ECC 1684 dev->useNANDECC = 1; 1685 #endif 1686 1687 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES 1688 dev->wideTnodesDisabled = 1; 1689 #endif 1690 1691 /* we assume this is protected by lock_kernel() in mount/umount */ 1692 list_add_tail(&dev->devList, &yaffs_dev_list); 1693 1694 init_MUTEX(&dev->grossLock); 1695 1696 yaffs_GrossLock(dev); 1697 1698 #ifdef CONFIG_YAFFS_ERASE_MOUNT_OPTION 1699 if(data && strcmp((char *) data, "erase") == 0) { 1700 int i; 1701 T(YAFFS_TRACE_ALWAYS, 1702 ("yaffs_read_super: Erasing device\n")); 1703 for(i = 0; i < nBlocks; i++) 1704 dev->eraseBlockInNAND(dev, i); 1705 } 1706 #endif 1707 1708 err = yaffs_GutsInitialise(dev); 1709 1710 T(YAFFS_TRACE_OS, 1711 ("yaffs_read_super: guts initialised %s\n", 1712 (err == YAFFS_OK) ? "OK" : "FAILED")); 1713 1714 /* Release lock before yaffs_get_inode() */ 1715 yaffs_GrossUnlock(dev); 1716 1717 /* Create root inode */ 1718 if (err == YAFFS_OK) 1719 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, 1720 yaffs_Root(dev)); 1721 1722 if (!inode) 1723 return NULL; 1724 1725 inode->i_op = &yaffs_dir_inode_operations; 1726 inode->i_fop = &yaffs_dir_operations; 1727 1728 T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n")); 1729 1730 root = d_alloc_root(inode); 1731 1732 T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n")); 1733 1734 if (!root) { 1735 iput(inode); 1736 return NULL; 1737 } 1738 sb->s_root = root; 1739 1740 T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n")); 1741 return sb; 1742 } 1743 1744 1745 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 1746 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data, 1747 int silent) 1748 { 1749 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL; 1750 } 1751 1752 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1753 static int yaffs_read_super(struct file_system_type *fs, 1754 int flags, const char *dev_name, 1755 void *data, struct vfsmount *mnt) 1756 { 1757 1758 return get_sb_bdev(fs, flags, dev_name, data, 1759 yaffs_internal_read_super_mtd, mnt); 1760 } 1761 #else 1762 static struct super_block *yaffs_read_super(struct file_system_type *fs, 1763 int flags, const char *dev_name, 1764 void *data) 1765 { 1766 1767 return get_sb_bdev(fs, flags, dev_name, data, 1768 yaffs_internal_read_super_mtd); 1769 } 1770 #endif 1771 1772 static struct file_system_type yaffs_fs_type = { 1773 .owner = THIS_MODULE, 1774 .name = "yaffs", 1775 .get_sb = yaffs_read_super, 1776 .kill_sb = kill_block_super, 1777 .fs_flags = FS_REQUIRES_DEV, 1778 }; 1779 #else 1780 static struct super_block *yaffs_read_super(struct super_block *sb, void *data, 1781 int silent) 1782 { 1783 return yaffs_internal_read_super(1, sb, data, silent); 1784 } 1785 1786 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, 1787 FS_REQUIRES_DEV); 1788 #endif 1789 1790 1791 #ifdef CONFIG_YAFFS_YAFFS2 1792 1793 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)) 1794 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data, 1795 int silent) 1796 { 1797 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL; 1798 } 1799 1800 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)) 1801 static int yaffs2_read_super(struct file_system_type *fs, 1802 int flags, const char *dev_name, void *data, 1803 struct vfsmount *mnt) 1804 { 1805 return get_sb_bdev(fs, flags, dev_name, data, 1806 yaffs2_internal_read_super_mtd, mnt); 1807 } 1808 #else 1809 static struct super_block *yaffs2_read_super(struct file_system_type *fs, 1810 int flags, const char *dev_name, 1811 void *data) 1812 { 1813 1814 return get_sb_bdev(fs, flags, dev_name, data, 1815 yaffs2_internal_read_super_mtd); 1816 } 1817 #endif 1818 1819 static struct file_system_type yaffs2_fs_type = { 1820 .owner = THIS_MODULE, 1821 .name = "yaffs2", 1822 .get_sb = yaffs2_read_super, 1823 .kill_sb = kill_block_super, 1824 .fs_flags = FS_REQUIRES_DEV, 1825 }; 1826 #else 1827 static struct super_block *yaffs2_read_super(struct super_block *sb, 1828 void *data, int silent) 1829 { 1830 return yaffs_internal_read_super(2, sb, data, silent); 1831 } 1832 1833 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, 1834 FS_REQUIRES_DEV); 1835 #endif 1836 1837 #endif /* CONFIG_YAFFS_YAFFS2 */ 1838 1839 static struct proc_dir_entry *my_proc_entry; 1840 1841 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev) 1842 { 1843 buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock); 1844 buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock); 1845 buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits); 1846 buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize); 1847 buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks); 1848 buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated); 1849 buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes); 1850 buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated); 1851 buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects); 1852 buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks); 1853 buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites); 1854 buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads); 1855 buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures); 1856 buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies); 1857 buf += 1858 sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections); 1859 buf += 1860 sprintf(buf, "passiveGCs......... %d\n", 1861 dev->passiveGarbageCollections); 1862 buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites); 1863 buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks); 1864 buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed); 1865 buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed); 1866 buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed); 1867 buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed); 1868 buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits); 1869 buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles); 1870 buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles); 1871 buf += 1872 sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions); 1873 buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC); 1874 buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2); 1875 1876 return buf; 1877 } 1878 1879 static int yaffs_proc_read(char *page, 1880 char **start, 1881 off_t offset, int count, int *eof, void *data) 1882 { 1883 struct list_head *item; 1884 char *buf = page; 1885 int step = offset; 1886 int n = 0; 1887 1888 /* Get proc_file_read() to step 'offset' by one on each sucessive call. 1889 * We use 'offset' (*ppos) to indicate where we are in devList. 1890 * This also assumes the user has posted a read buffer large 1891 * enough to hold the complete output; but that's life in /proc. 1892 */ 1893 1894 *(int *)start = 1; 1895 1896 /* Print header first */ 1897 if (step == 0) { 1898 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ 1899 "\n%s\n%s\n", yaffs_fs_c_version, 1900 yaffs_guts_c_version); 1901 } 1902 1903 /* hold lock_kernel while traversing yaffs_dev_list */ 1904 lock_kernel(); 1905 1906 /* Locate and print the Nth entry. Order N-squared but N is small. */ 1907 list_for_each(item, &yaffs_dev_list) { 1908 yaffs_Device *dev = list_entry(item, yaffs_Device, devList); 1909 if (n < step) { 1910 n++; 1911 continue; 1912 } 1913 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name); 1914 buf = yaffs_dump_dev(buf, dev); 1915 break; 1916 } 1917 unlock_kernel(); 1918 1919 return buf - page < count ? buf - page : count; 1920 } 1921 1922 /** 1923 * Set the verbosity of the warnings and error messages. 1924 * 1925 */ 1926 1927 static struct { 1928 char *mask_name; 1929 unsigned mask_bitfield; 1930 } mask_flags[] = { 1931 {"allocate", YAFFS_TRACE_ALLOCATE}, 1932 {"always", YAFFS_TRACE_ALWAYS}, 1933 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS}, 1934 {"buffers", YAFFS_TRACE_BUFFERS}, 1935 {"bug", YAFFS_TRACE_BUG}, 1936 {"deletion", YAFFS_TRACE_DELETION}, 1937 {"erase", YAFFS_TRACE_ERASE}, 1938 {"error", YAFFS_TRACE_ERROR}, 1939 {"gc_detail", YAFFS_TRACE_GC_DETAIL}, 1940 {"gc", YAFFS_TRACE_GC}, 1941 {"mtd", YAFFS_TRACE_MTD}, 1942 {"nandaccess", YAFFS_TRACE_NANDACCESS}, 1943 {"os", YAFFS_TRACE_OS}, 1944 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG}, 1945 {"scan", YAFFS_TRACE_SCAN}, 1946 {"tracing", YAFFS_TRACE_TRACING}, 1947 {"write", YAFFS_TRACE_WRITE}, 1948 {"all", 0xffffffff}, 1949 {"none", 0}, 1950 {NULL, 0}, 1951 }; 1952 1953 static int yaffs_proc_write(struct file *file, const char *buf, 1954 unsigned long count, void *data) 1955 { 1956 unsigned rg = 0, mask_bitfield; 1957 char *end, *mask_name; 1958 int i; 1959 int done = 0; 1960 int add, len; 1961 int pos = 0; 1962 1963 rg = yaffs_traceMask; 1964 1965 while (!done && (pos < count)) { 1966 done = 1; 1967 while ((pos < count) && isspace(buf[pos])) { 1968 pos++; 1969 } 1970 1971 switch (buf[pos]) { 1972 case '+': 1973 case '-': 1974 case '=': 1975 add = buf[pos]; 1976 pos++; 1977 break; 1978 1979 default: 1980 add = ' '; 1981 break; 1982 } 1983 mask_name = NULL; 1984 mask_bitfield = simple_strtoul(buf + pos, &end, 0); 1985 if (end > buf + pos) { 1986 mask_name = "numeral"; 1987 len = end - (buf + pos); 1988 done = 0; 1989 } else { 1990 1991 for (i = 0; mask_flags[i].mask_name != NULL; i++) { 1992 len = strlen(mask_flags[i].mask_name); 1993 if (strncmp(buf + pos, mask_flags[i].mask_name, len) == 0) { 1994 mask_name = mask_flags[i].mask_name; 1995 mask_bitfield = mask_flags[i].mask_bitfield; 1996 done = 0; 1997 break; 1998 } 1999 } 2000 } 2001 2002 if (mask_name != NULL) { 2003 pos += len; 2004 done = 0; 2005 switch(add) { 2006 case '-': 2007 rg &= ~mask_bitfield; 2008 break; 2009 case '+': 2010 rg |= mask_bitfield; 2011 break; 2012 case '=': 2013 rg = mask_bitfield; 2014 break; 2015 default: 2016 rg |= mask_bitfield; 2017 break; 2018 } 2019 } 2020 } 2021 2022 yaffs_traceMask = rg; 2023 if (rg & YAFFS_TRACE_ALWAYS) { 2024 for (i = 0; mask_flags[i].mask_name != NULL; i++) { 2025 char flag; 2026 flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-'; 2027 printk("%c%s\n", flag, mask_flags[i].mask_name); 2028 } 2029 } 2030 2031 return count; 2032 } 2033 2034 /* Stuff to handle installation of file systems */ 2035 struct file_system_to_install { 2036 struct file_system_type *fst; 2037 int installed; 2038 }; 2039 2040 static struct file_system_to_install fs_to_install[] = { 2041 //#ifdef CONFIG_YAFFS_YAFFS1 2042 {&yaffs_fs_type, 0}, 2043 //#endif 2044 //#ifdef CONFIG_YAFFS_YAFFS2 2045 {&yaffs2_fs_type, 0}, 2046 //#endif 2047 {NULL, 0} 2048 }; 2049 2050 static int __init init_yaffs_fs(void) 2051 { 2052 int error = 0; 2053 struct file_system_to_install *fsinst; 2054 2055 T(YAFFS_TRACE_ALWAYS, 2056 ("yaffs " __DATE__ " " __TIME__ " Installing. \n")); 2057 2058 /* Install the proc_fs entry */ 2059 my_proc_entry = create_proc_entry("yaffs", 2060 S_IRUGO | S_IFREG, 2061 &proc_root); 2062 2063 if (my_proc_entry) { 2064 my_proc_entry->write_proc = yaffs_proc_write; 2065 my_proc_entry->read_proc = yaffs_proc_read; 2066 my_proc_entry->data = NULL; 2067 } else { 2068 return -ENOMEM; 2069 } 2070 2071 /* Now add the file system entries */ 2072 2073 fsinst = fs_to_install; 2074 2075 while (fsinst->fst && !error) { 2076 error = register_filesystem(fsinst->fst); 2077 if (!error) { 2078 fsinst->installed = 1; 2079 } 2080 fsinst++; 2081 } 2082 2083 /* Any errors? uninstall */ 2084 if (error) { 2085 fsinst = fs_to_install; 2086 2087 while (fsinst->fst) { 2088 if (fsinst->installed) { 2089 unregister_filesystem(fsinst->fst); 2090 fsinst->installed = 0; 2091 } 2092 fsinst++; 2093 } 2094 } 2095 2096 return error; 2097 } 2098 2099 static void __exit exit_yaffs_fs(void) 2100 { 2101 2102 struct file_system_to_install *fsinst; 2103 2104 T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__ 2105 " removing. \n")); 2106 2107 remove_proc_entry("yaffs", &proc_root); 2108 2109 fsinst = fs_to_install; 2110 2111 while (fsinst->fst) { 2112 if (fsinst->installed) { 2113 unregister_filesystem(fsinst->fst); 2114 fsinst->installed = 0; 2115 } 2116 fsinst++; 2117 } 2118 2119 } 2120 2121 module_init(init_yaffs_fs) 2122 module_exit(exit_yaffs_fs) 2123 2124 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system"); 2125 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006"); 2126 MODULE_LICENSE("GPL"); 2127
