1 /* 2 * QNX4 file system, Linux implementation. 3 * 4 * Version : 0.2.1 5 * 6 * Using parts of the xiafs filesystem. 7 * 8 * History : 9 * 10 * 01-06-1998 by Richard Frowijn : first release. 11 * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc. 12 * 30-06-1998 by Frank Denis : first step to write inodes. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/types.h> 17 #include <linux/string.h> 18 #include <linux/errno.h> 19 #include <linux/slab.h> 20 #include <linux/fs.h> 21 #include <linux/qnx4_fs.h> 22 #include <linux/init.h> 23 #include <linux/highuid.h> 24 #include <linux/smp_lock.h> 25 #include <linux/pagemap.h> 26 #include <linux/buffer_head.h> 27 #include <linux/vfs.h> 28 #include <asm/uaccess.h> 29 30 #define QNX4_VERSION 4 31 #define QNX4_BMNAME ".bitmap" 32 33 static const struct super_operations qnx4_sops; 34 35 #ifdef CONFIG_QNX4FS_RW 36 37 int qnx4_sync_inode(struct inode *inode) 38 { 39 int err = 0; 40 # if 0 41 struct buffer_head *bh; 42 43 bh = qnx4_update_inode(inode); 44 if (bh && buffer_dirty(bh)) 45 { 46 sync_dirty_buffer(bh); 47 if (buffer_req(bh) && !buffer_uptodate(bh)) 48 { 49 printk ("IO error syncing qnx4 inode [%s:%08lx]\n", 50 inode->i_sb->s_id, inode->i_ino); 51 err = -1; 52 } 53 brelse (bh); 54 } else if (!bh) { 55 err = -1; 56 } 57 # endif 58 59 return err; 60 } 61 62 static void qnx4_delete_inode(struct inode *inode) 63 { 64 QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino)); 65 truncate_inode_pages(&inode->i_data, 0); 66 inode->i_size = 0; 67 qnx4_truncate(inode); 68 lock_kernel(); 69 qnx4_free_inode(inode); 70 unlock_kernel(); 71 } 72 73 static void qnx4_write_super(struct super_block *sb) 74 { 75 lock_kernel(); 76 QNX4DEBUG(("qnx4: write_super\n")); 77 sb->s_dirt = 0; 78 unlock_kernel(); 79 } 80 81 static int qnx4_write_inode(struct inode *inode, int unused) 82 { 83 struct qnx4_inode_entry *raw_inode; 84 int block, ino; 85 struct buffer_head *bh; 86 ino = inode->i_ino; 87 88 QNX4DEBUG(("qnx4: write inode 1.\n")); 89 if (inode->i_nlink == 0) { 90 return 0; 91 } 92 if (!ino) { 93 printk("qnx4: bad inode number on dev %s: %d is out of range\n", 94 inode->i_sb->s_id, ino); 95 return -EIO; 96 } 97 QNX4DEBUG(("qnx4: write inode 2.\n")); 98 block = ino / QNX4_INODES_PER_BLOCK; 99 lock_kernel(); 100 if (!(bh = sb_bread(inode->i_sb, block))) { 101 printk("qnx4: major problem: unable to read inode from dev " 102 "%s\n", inode->i_sb->s_id); 103 unlock_kernel(); 104 return -EIO; 105 } 106 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) + 107 (ino % QNX4_INODES_PER_BLOCK); 108 raw_inode->di_mode = cpu_to_le16(inode->i_mode); 109 raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid)); 110 raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid)); 111 raw_inode->di_nlink = cpu_to_le16(inode->i_nlink); 112 raw_inode->di_size = cpu_to_le32(inode->i_size); 113 raw_inode->di_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 114 raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec); 115 raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 116 raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks); 117 mark_buffer_dirty(bh); 118 brelse(bh); 119 unlock_kernel(); 120 return 0; 121 } 122 123 #endif 124 125 static void qnx4_put_super(struct super_block *sb); 126 static struct inode *qnx4_alloc_inode(struct super_block *sb); 127 static void qnx4_destroy_inode(struct inode *inode); 128 static int qnx4_remount(struct super_block *sb, int *flags, char *data); 129 static int qnx4_statfs(struct dentry *, struct kstatfs *); 130 131 static const struct super_operations qnx4_sops = 132 { 133 .alloc_inode = qnx4_alloc_inode, 134 .destroy_inode = qnx4_destroy_inode, 135 .put_super = qnx4_put_super, 136 .statfs = qnx4_statfs, 137 .remount_fs = qnx4_remount, 138 #ifdef CONFIG_QNX4FS_RW 139 .write_inode = qnx4_write_inode, 140 .delete_inode = qnx4_delete_inode, 141 .write_super = qnx4_write_super, 142 #endif 143 }; 144 145 static int qnx4_remount(struct super_block *sb, int *flags, char *data) 146 { 147 struct qnx4_sb_info *qs; 148 149 qs = qnx4_sb(sb); 150 qs->Version = QNX4_VERSION; 151 #ifndef CONFIG_QNX4FS_RW 152 *flags |= MS_RDONLY; 153 #endif 154 if (*flags & MS_RDONLY) { 155 return 0; 156 } 157 158 mark_buffer_dirty(qs->sb_buf); 159 160 return 0; 161 } 162 163 static struct buffer_head *qnx4_getblk(struct inode *inode, int nr, 164 int create) 165 { 166 struct buffer_head *result = NULL; 167 168 if ( nr >= 0 ) 169 nr = qnx4_block_map( inode, nr ); 170 if (nr) { 171 result = sb_getblk(inode->i_sb, nr); 172 return result; 173 } 174 if (!create) { 175 return NULL; 176 } 177 #if 0 178 tmp = qnx4_new_block(inode->i_sb); 179 if (!tmp) { 180 return NULL; 181 } 182 result = sb_getblk(inode->i_sb, tmp); 183 if (tst) { 184 qnx4_free_block(inode->i_sb, tmp); 185 brelse(result); 186 goto repeat; 187 } 188 tst = tmp; 189 #endif 190 inode->i_ctime = CURRENT_TIME_SEC; 191 mark_inode_dirty(inode); 192 return result; 193 } 194 195 struct buffer_head *qnx4_bread(struct inode *inode, int block, int create) 196 { 197 struct buffer_head *bh; 198 199 bh = qnx4_getblk(inode, block, create); 200 if (!bh || buffer_uptodate(bh)) { 201 return bh; 202 } 203 ll_rw_block(READ, 1, &bh); 204 wait_on_buffer(bh); 205 if (buffer_uptodate(bh)) { 206 return bh; 207 } 208 brelse(bh); 209 210 return NULL; 211 } 212 213 static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create ) 214 { 215 unsigned long phys; 216 217 QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock)); 218 219 phys = qnx4_block_map( inode, iblock ); 220 if ( phys ) { 221 // logical block is before EOF 222 map_bh(bh, inode->i_sb, phys); 223 } else if ( create ) { 224 // to be done. 225 } 226 return 0; 227 } 228 229 unsigned long qnx4_block_map( struct inode *inode, long iblock ) 230 { 231 int ix; 232 long offset, i_xblk; 233 unsigned long block = 0; 234 struct buffer_head *bh = NULL; 235 struct qnx4_xblk *xblk = NULL; 236 struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode); 237 u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts); 238 239 if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) { 240 // iblock is in the first extent. This is easy. 241 block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1; 242 } else { 243 // iblock is beyond first extent. We have to follow the extent chain. 244 i_xblk = le32_to_cpu(qnx4_inode->di_xblk); 245 offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size); 246 ix = 0; 247 while ( --nxtnt > 0 ) { 248 if ( ix == 0 ) { 249 // read next xtnt block. 250 bh = sb_bread(inode->i_sb, i_xblk - 1); 251 if ( !bh ) { 252 QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1)); 253 return -EIO; 254 } 255 xblk = (struct qnx4_xblk*)bh->b_data; 256 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) { 257 QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk)); 258 return -EIO; 259 } 260 } 261 if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) { 262 // got it! 263 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1; 264 break; 265 } 266 offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size); 267 if ( ++ix >= xblk->xblk_num_xtnts ) { 268 i_xblk = le32_to_cpu(xblk->xblk_next_xblk); 269 ix = 0; 270 brelse( bh ); 271 bh = NULL; 272 } 273 } 274 if ( bh ) 275 brelse( bh ); 276 } 277 278 QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block)); 279 return block; 280 } 281 282 static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf) 283 { 284 struct super_block *sb = dentry->d_sb; 285 286 lock_kernel(); 287 288 buf->f_type = sb->s_magic; 289 buf->f_bsize = sb->s_blocksize; 290 buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8; 291 buf->f_bfree = qnx4_count_free_blocks(sb); 292 buf->f_bavail = buf->f_bfree; 293 buf->f_namelen = QNX4_NAME_MAX; 294 295 unlock_kernel(); 296 297 return 0; 298 } 299 300 /* 301 * Check the root directory of the filesystem to make sure 302 * it really _is_ a qnx4 filesystem, and to check the size 303 * of the directory entry. 304 */ 305 static const char *qnx4_checkroot(struct super_block *sb) 306 { 307 struct buffer_head *bh; 308 struct qnx4_inode_entry *rootdir; 309 int rd, rl; 310 int i, j; 311 int found = 0; 312 313 if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') { 314 return "no qnx4 filesystem (no root dir)."; 315 } else { 316 QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id)); 317 rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1; 318 rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size); 319 for (j = 0; j < rl; j++) { 320 bh = sb_bread(sb, rd + j); /* root dir, first block */ 321 if (bh == NULL) { 322 return "unable to read root entry."; 323 } 324 for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) { 325 rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE); 326 if (rootdir->di_fname != NULL) { 327 QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname)); 328 if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) { 329 found = 1; 330 qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL ); 331 if (!qnx4_sb(sb)->BitMap) { 332 brelse (bh); 333 return "not enough memory for bitmap inode"; 334 } 335 memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */ 336 break; 337 } 338 } 339 } 340 brelse(bh); 341 if (found != 0) { 342 break; 343 } 344 } 345 if (found == 0) { 346 return "bitmap file not found."; 347 } 348 } 349 return NULL; 350 } 351 352 static int qnx4_fill_super(struct super_block *s, void *data, int silent) 353 { 354 struct buffer_head *bh; 355 struct inode *root; 356 const char *errmsg; 357 struct qnx4_sb_info *qs; 358 int ret = -EINVAL; 359 360 qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL); 361 if (!qs) 362 return -ENOMEM; 363 s->s_fs_info = qs; 364 365 sb_set_blocksize(s, QNX4_BLOCK_SIZE); 366 367 /* Check the superblock signature. Since the qnx4 code is 368 dangerous, we should leave as quickly as possible 369 if we don't belong here... */ 370 bh = sb_bread(s, 1); 371 if (!bh) { 372 printk("qnx4: unable to read the superblock\n"); 373 goto outnobh; 374 } 375 if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) { 376 if (!silent) 377 printk("qnx4: wrong fsid in superblock.\n"); 378 goto out; 379 } 380 s->s_op = &qnx4_sops; 381 s->s_magic = QNX4_SUPER_MAGIC; 382 #ifndef CONFIG_QNX4FS_RW 383 s->s_flags |= MS_RDONLY; /* Yup, read-only yet */ 384 #endif 385 qnx4_sb(s)->sb_buf = bh; 386 qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data; 387 388 389 /* check before allocating dentries, inodes, .. */ 390 errmsg = qnx4_checkroot(s); 391 if (errmsg != NULL) { 392 if (!silent) 393 printk("qnx4: %s\n", errmsg); 394 goto out; 395 } 396 397 /* does root not have inode number QNX4_ROOT_INO ?? */ 398 root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK); 399 if (IS_ERR(root)) { 400 printk("qnx4: get inode failed\n"); 401 ret = PTR_ERR(root); 402 goto out; 403 } 404 405 ret = -ENOMEM; 406 s->s_root = d_alloc_root(root); 407 if (s->s_root == NULL) 408 goto outi; 409 410 brelse(bh); 411 412 return 0; 413 414 outi: 415 iput(root); 416 out: 417 brelse(bh); 418 outnobh: 419 kfree(qs); 420 s->s_fs_info = NULL; 421 return ret; 422 } 423 424 static void qnx4_put_super(struct super_block *sb) 425 { 426 struct qnx4_sb_info *qs = qnx4_sb(sb); 427 kfree( qs->BitMap ); 428 kfree( qs ); 429 sb->s_fs_info = NULL; 430 return; 431 } 432 433 static int qnx4_writepage(struct page *page, struct writeback_control *wbc) 434 { 435 return block_write_full_page(page,qnx4_get_block, wbc); 436 } 437 438 static int qnx4_readpage(struct file *file, struct page *page) 439 { 440 return block_read_full_page(page,qnx4_get_block); 441 } 442 443 static int qnx4_write_begin(struct file *file, struct address_space *mapping, 444 loff_t pos, unsigned len, unsigned flags, 445 struct page **pagep, void **fsdata) 446 { 447 struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host); 448 *pagep = NULL; 449 return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, 450 qnx4_get_block, 451 &qnx4_inode->mmu_private); 452 } 453 static sector_t qnx4_bmap(struct address_space *mapping, sector_t block) 454 { 455 return generic_block_bmap(mapping,block,qnx4_get_block); 456 } 457 static const struct address_space_operations qnx4_aops = { 458 .readpage = qnx4_readpage, 459 .writepage = qnx4_writepage, 460 .sync_page = block_sync_page, 461 .write_begin = qnx4_write_begin, 462 .write_end = generic_write_end, 463 .bmap = qnx4_bmap 464 }; 465 466 struct inode *qnx4_iget(struct super_block *sb, unsigned long ino) 467 { 468 struct buffer_head *bh; 469 struct qnx4_inode_entry *raw_inode; 470 int block; 471 struct qnx4_inode_entry *qnx4_inode; 472 struct inode *inode; 473 474 inode = iget_locked(sb, ino); 475 if (!inode) 476 return ERR_PTR(-ENOMEM); 477 if (!(inode->i_state & I_NEW)) 478 return inode; 479 480 qnx4_inode = qnx4_raw_inode(inode); 481 inode->i_mode = 0; 482 483 QNX4DEBUG(("Reading inode : [%d]\n", ino)); 484 if (!ino) { 485 printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is " 486 "out of range\n", 487 sb->s_id, ino); 488 iget_failed(inode); 489 return ERR_PTR(-EIO); 490 } 491 block = ino / QNX4_INODES_PER_BLOCK; 492 493 if (!(bh = sb_bread(sb, block))) { 494 printk("qnx4: major problem: unable to read inode from dev " 495 "%s\n", sb->s_id); 496 iget_failed(inode); 497 return ERR_PTR(-EIO); 498 } 499 raw_inode = ((struct qnx4_inode_entry *) bh->b_data) + 500 (ino % QNX4_INODES_PER_BLOCK); 501 502 inode->i_mode = le16_to_cpu(raw_inode->di_mode); 503 inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid); 504 inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid); 505 inode->i_nlink = le16_to_cpu(raw_inode->di_nlink); 506 inode->i_size = le32_to_cpu(raw_inode->di_size); 507 inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime); 508 inode->i_mtime.tv_nsec = 0; 509 inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime); 510 inode->i_atime.tv_nsec = 0; 511 inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime); 512 inode->i_ctime.tv_nsec = 0; 513 inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size); 514 515 memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE); 516 if (S_ISREG(inode->i_mode)) { 517 inode->i_op = &qnx4_file_inode_operations; 518 inode->i_fop = &qnx4_file_operations; 519 inode->i_mapping->a_ops = &qnx4_aops; 520 qnx4_i(inode)->mmu_private = inode->i_size; 521 } else if (S_ISDIR(inode->i_mode)) { 522 inode->i_op = &qnx4_dir_inode_operations; 523 inode->i_fop = &qnx4_dir_operations; 524 } else if (S_ISLNK(inode->i_mode)) { 525 inode->i_op = &page_symlink_inode_operations; 526 inode->i_mapping->a_ops = &qnx4_aops; 527 qnx4_i(inode)->mmu_private = inode->i_size; 528 } else { 529 printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n", 530 ino, sb->s_id); 531 iget_failed(inode); 532 brelse(bh); 533 return ERR_PTR(-EIO); 534 } 535 brelse(bh); 536 unlock_new_inode(inode); 537 return inode; 538 } 539 540 static struct kmem_cache *qnx4_inode_cachep; 541 542 static struct inode *qnx4_alloc_inode(struct super_block *sb) 543 { 544 struct qnx4_inode_info *ei; 545 ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL); 546 if (!ei) 547 return NULL; 548 return &ei->vfs_inode; 549 } 550 551 static void qnx4_destroy_inode(struct inode *inode) 552 { 553 kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode)); 554 } 555 556 static void init_once(struct kmem_cache *cachep, void *foo) 557 { 558 struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo; 559 560 inode_init_once(&ei->vfs_inode); 561 } 562 563 static int init_inodecache(void) 564 { 565 qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache", 566 sizeof(struct qnx4_inode_info), 567 0, (SLAB_RECLAIM_ACCOUNT| 568 SLAB_MEM_SPREAD), 569 init_once); 570 if (qnx4_inode_cachep == NULL) 571 return -ENOMEM; 572 return 0; 573 } 574 575 static void destroy_inodecache(void) 576 { 577 kmem_cache_destroy(qnx4_inode_cachep); 578 } 579 580 static int qnx4_get_sb(struct file_system_type *fs_type, 581 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 582 { 583 return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super, 584 mnt); 585 } 586 587 static struct file_system_type qnx4_fs_type = { 588 .owner = THIS_MODULE, 589 .name = "qnx4", 590 .get_sb = qnx4_get_sb, 591 .kill_sb = kill_block_super, 592 .fs_flags = FS_REQUIRES_DEV, 593 }; 594 595 static int __init init_qnx4_fs(void) 596 { 597 int err; 598 599 err = init_inodecache(); 600 if (err) 601 return err; 602 603 err = register_filesystem(&qnx4_fs_type); 604 if (err) { 605 destroy_inodecache(); 606 return err; 607 } 608 609 printk("QNX4 filesystem 0.2.3 registered.\n"); 610 return 0; 611 } 612 613 static void __exit exit_qnx4_fs(void) 614 { 615 unregister_filesystem(&qnx4_fs_type); 616 destroy_inodecache(); 617 } 618 619 module_init(init_qnx4_fs) 620 module_exit(exit_qnx4_fs) 621 MODULE_LICENSE("GPL"); 622 623