1 /* 2 * fs/bfs/inode.c 3 * BFS superblock and inode operations. 4 * Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk> 5 * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. 6 * 7 * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005. 8 */ 9 10 #include <linux/module.h> 11 #include <linux/mm.h> 12 #include <linux/slab.h> 13 #include <linux/init.h> 14 #include <linux/fs.h> 15 #include <linux/smp_lock.h> 16 #include <linux/buffer_head.h> 17 #include <linux/vfs.h> 18 #include <asm/uaccess.h> 19 #include "bfs.h" 20 21 MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); 22 MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux"); 23 MODULE_LICENSE("GPL"); 24 25 #undef DEBUG 26 27 #ifdef DEBUG 28 #define dprintf(x...) printf(x) 29 #else 30 #define dprintf(x...) 31 #endif 32 33 static void bfs_write_super(struct super_block *s); 34 void dump_imap(const char *prefix, struct super_block *s); 35 36 struct inode *bfs_iget(struct super_block *sb, unsigned long ino) 37 { 38 struct bfs_inode *di; 39 struct inode *inode; 40 struct buffer_head *bh; 41 int block, off; 42 43 inode = iget_locked(sb, ino); 44 if (IS_ERR(inode)) 45 return ERR_PTR(-ENOMEM); 46 if (!(inode->i_state & I_NEW)) 47 return inode; 48 49 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 50 printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); 51 goto error; 52 } 53 54 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 55 bh = sb_bread(inode->i_sb, block); 56 if (!bh) { 57 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, 58 ino); 59 goto error; 60 } 61 62 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 63 di = (struct bfs_inode *)bh->b_data + off; 64 65 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); 66 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { 67 inode->i_mode |= S_IFDIR; 68 inode->i_op = &bfs_dir_inops; 69 inode->i_fop = &bfs_dir_operations; 70 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { 71 inode->i_mode |= S_IFREG; 72 inode->i_op = &bfs_file_inops; 73 inode->i_fop = &bfs_file_operations; 74 inode->i_mapping->a_ops = &bfs_aops; 75 } 76 77 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); 78 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); 79 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); 80 inode->i_uid = le32_to_cpu(di->i_uid); 81 inode->i_gid = le32_to_cpu(di->i_gid); 82 inode->i_nlink = le32_to_cpu(di->i_nlink); 83 inode->i_size = BFS_FILESIZE(di); 84 inode->i_blocks = BFS_FILEBLOCKS(di); 85 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); 86 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); 87 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); 88 inode->i_atime.tv_nsec = 0; 89 inode->i_mtime.tv_nsec = 0; 90 inode->i_ctime.tv_nsec = 0; 91 92 brelse(bh); 93 unlock_new_inode(inode); 94 return inode; 95 96 error: 97 iget_failed(inode); 98 return ERR_PTR(-EIO); 99 } 100 101 static int bfs_write_inode(struct inode *inode, int wait) 102 { 103 struct bfs_sb_info *info = BFS_SB(inode->i_sb); 104 unsigned int ino = (u16)inode->i_ino; 105 unsigned long i_sblock; 106 struct bfs_inode *di; 107 struct buffer_head *bh; 108 int block, off; 109 int err = 0; 110 111 dprintf("ino=%08x\n", ino); 112 113 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 114 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino); 115 return -EIO; 116 } 117 118 mutex_lock(&info->bfs_lock); 119 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 120 bh = sb_bread(inode->i_sb, block); 121 if (!bh) { 122 printf("Unable to read inode %s:%08x\n", 123 inode->i_sb->s_id, ino); 124 mutex_unlock(&info->bfs_lock); 125 return -EIO; 126 } 127 128 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 129 di = (struct bfs_inode *)bh->b_data + off; 130 131 if (ino == BFS_ROOT_INO) 132 di->i_vtype = cpu_to_le32(BFS_VDIR); 133 else 134 di->i_vtype = cpu_to_le32(BFS_VREG); 135 136 di->i_ino = cpu_to_le16(ino); 137 di->i_mode = cpu_to_le32(inode->i_mode); 138 di->i_uid = cpu_to_le32(inode->i_uid); 139 di->i_gid = cpu_to_le32(inode->i_gid); 140 di->i_nlink = cpu_to_le32(inode->i_nlink); 141 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); 142 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 143 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 144 i_sblock = BFS_I(inode)->i_sblock; 145 di->i_sblock = cpu_to_le32(i_sblock); 146 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); 147 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); 148 149 mark_buffer_dirty(bh); 150 if (wait) { 151 sync_dirty_buffer(bh); 152 if (buffer_req(bh) && !buffer_uptodate(bh)) 153 err = -EIO; 154 } 155 brelse(bh); 156 mutex_unlock(&info->bfs_lock); 157 return err; 158 } 159 160 static void bfs_delete_inode(struct inode *inode) 161 { 162 unsigned long ino = inode->i_ino; 163 struct bfs_inode *di; 164 struct buffer_head *bh; 165 int block, off; 166 struct super_block *s = inode->i_sb; 167 struct bfs_sb_info *info = BFS_SB(s); 168 struct bfs_inode_info *bi = BFS_I(inode); 169 170 dprintf("ino=%08lx\n", ino); 171 172 truncate_inode_pages(&inode->i_data, 0); 173 174 if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) { 175 printf("invalid ino=%08lx\n", ino); 176 return; 177 } 178 179 inode->i_size = 0; 180 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; 181 mutex_lock(&info->bfs_lock); 182 mark_inode_dirty(inode); 183 184 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 185 bh = sb_bread(s, block); 186 if (!bh) { 187 printf("Unable to read inode %s:%08lx\n", 188 inode->i_sb->s_id, ino); 189 mutex_unlock(&info->bfs_lock); 190 return; 191 } 192 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 193 di = (struct bfs_inode *)bh->b_data + off; 194 memset((void *)di, 0, sizeof(struct bfs_inode)); 195 mark_buffer_dirty(bh); 196 brelse(bh); 197 198 if (bi->i_dsk_ino) { 199 if (bi->i_sblock) 200 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock; 201 info->si_freei++; 202 clear_bit(ino, info->si_imap); 203 dump_imap("delete_inode", s); 204 } 205 206 /* 207 * If this was the last file, make the previous block 208 * "last block of the last file" even if there is no 209 * real file there, saves us 1 gap. 210 */ 211 if (info->si_lf_eblk == bi->i_eblock) { 212 info->si_lf_eblk = bi->i_sblock - 1; 213 mark_buffer_dirty(info->si_sbh); 214 } 215 mutex_unlock(&info->bfs_lock); 216 clear_inode(inode); 217 } 218 219 static int bfs_sync_fs(struct super_block *sb, int wait) 220 { 221 struct bfs_sb_info *info = BFS_SB(sb); 222 223 mutex_lock(&info->bfs_lock); 224 mark_buffer_dirty(info->si_sbh); 225 sb->s_dirt = 0; 226 mutex_unlock(&info->bfs_lock); 227 228 return 0; 229 } 230 231 static void bfs_write_super(struct super_block *sb) 232 { 233 if (!(sb->s_flags & MS_RDONLY)) 234 bfs_sync_fs(sb, 1); 235 else 236 sb->s_dirt = 0; 237 } 238 239 static void bfs_put_super(struct super_block *s) 240 { 241 struct bfs_sb_info *info = BFS_SB(s); 242 243 if (!info) 244 return; 245 246 lock_kernel(); 247 248 if (s->s_dirt) 249 bfs_write_super(s); 250 251 brelse(info->si_sbh); 252 mutex_destroy(&info->bfs_lock); 253 kfree(info->si_imap); 254 kfree(info); 255 s->s_fs_info = NULL; 256 257 unlock_kernel(); 258 } 259 260 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 261 { 262 struct super_block *s = dentry->d_sb; 263 struct bfs_sb_info *info = BFS_SB(s); 264 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 265 buf->f_type = BFS_MAGIC; 266 buf->f_bsize = s->s_blocksize; 267 buf->f_blocks = info->si_blocks; 268 buf->f_bfree = buf->f_bavail = info->si_freeb; 269 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 270 buf->f_ffree = info->si_freei; 271 buf->f_fsid.val[0] = (u32)id; 272 buf->f_fsid.val[1] = (u32)(id >> 32); 273 buf->f_namelen = BFS_NAMELEN; 274 return 0; 275 } 276 277 static struct kmem_cache *bfs_inode_cachep; 278 279 static struct inode *bfs_alloc_inode(struct super_block *sb) 280 { 281 struct bfs_inode_info *bi; 282 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 283 if (!bi) 284 return NULL; 285 return &bi->vfs_inode; 286 } 287 288 static void bfs_destroy_inode(struct inode *inode) 289 { 290 kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 291 } 292 293 static void init_once(void *foo) 294 { 295 struct bfs_inode_info *bi = foo; 296 297 inode_init_once(&bi->vfs_inode); 298 } 299 300 static int init_inodecache(void) 301 { 302 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 303 sizeof(struct bfs_inode_info), 304 0, (SLAB_RECLAIM_ACCOUNT| 305 SLAB_MEM_SPREAD), 306 init_once); 307 if (bfs_inode_cachep == NULL) 308 return -ENOMEM; 309 return 0; 310 } 311 312 static void destroy_inodecache(void) 313 { 314 kmem_cache_destroy(bfs_inode_cachep); 315 } 316 317 static const struct super_operations bfs_sops = { 318 .alloc_inode = bfs_alloc_inode, 319 .destroy_inode = bfs_destroy_inode, 320 .write_inode = bfs_write_inode, 321 .delete_inode = bfs_delete_inode, 322 .put_super = bfs_put_super, 323 .write_super = bfs_write_super, 324 .sync_fs = bfs_sync_fs, 325 .statfs = bfs_statfs, 326 }; 327 328 void dump_imap(const char *prefix, struct super_block *s) 329 { 330 #ifdef DEBUG 331 int i; 332 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 333 334 if (!tmpbuf) 335 return; 336 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 337 if (i > PAGE_SIZE - 100) break; 338 if (test_bit(i, BFS_SB(s)->si_imap)) 339 strcat(tmpbuf, "1"); 340 else 341 strcat(tmpbuf, "0"); 342 } 343 printf("BFS-fs: %s: lasti=%08lx <%s>\n", 344 prefix, BFS_SB(s)->si_lasti, tmpbuf); 345 free_page((unsigned long)tmpbuf); 346 #endif 347 } 348 349 static int bfs_fill_super(struct super_block *s, void *data, int silent) 350 { 351 struct buffer_head *bh; 352 struct bfs_super_block *bfs_sb; 353 struct inode *inode; 354 unsigned i, imap_len; 355 struct bfs_sb_info *info; 356 int ret = -EINVAL; 357 unsigned long i_sblock, i_eblock, i_eoff, s_size; 358 359 info = kzalloc(sizeof(*info), GFP_KERNEL); 360 if (!info) 361 return -ENOMEM; 362 mutex_init(&info->bfs_lock); 363 s->s_fs_info = info; 364 365 sb_set_blocksize(s, BFS_BSIZE); 366 367 info->si_sbh = sb_bread(s, 0); 368 if (!info->si_sbh) 369 goto out; 370 bfs_sb = (struct bfs_super_block *)info->si_sbh->b_data; 371 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 372 if (!silent) 373 printf("No BFS filesystem on %s (magic=%08x)\n", 374 s->s_id, le32_to_cpu(bfs_sb->s_magic)); 375 goto out1; 376 } 377 if (BFS_UNCLEAN(bfs_sb, s) && !silent) 378 printf("%s is unclean, continuing\n", s->s_id); 379 380 s->s_magic = BFS_MAGIC; 381 382 if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) { 383 printf("Superblock is corrupted\n"); 384 goto out1; 385 } 386 387 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / 388 sizeof(struct bfs_inode) 389 + BFS_ROOT_INO - 1; 390 imap_len = (info->si_lasti / 8) + 1; 391 info->si_imap = kzalloc(imap_len, GFP_KERNEL); 392 if (!info->si_imap) 393 goto out1; 394 for (i = 0; i < BFS_ROOT_INO; i++) 395 set_bit(i, info->si_imap); 396 397 s->s_op = &bfs_sops; 398 inode = bfs_iget(s, BFS_ROOT_INO); 399 if (IS_ERR(inode)) { 400 ret = PTR_ERR(inode); 401 goto out2; 402 } 403 s->s_root = d_alloc_root(inode); 404 if (!s->s_root) { 405 iput(inode); 406 ret = -ENOMEM; 407 goto out2; 408 } 409 410 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 411 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 412 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 413 info->si_freei = 0; 414 info->si_lf_eblk = 0; 415 416 /* can we read the last block? */ 417 bh = sb_bread(s, info->si_blocks - 1); 418 if (!bh) { 419 printf("Last block not available: %lu\n", info->si_blocks - 1); 420 ret = -EIO; 421 goto out3; 422 } 423 brelse(bh); 424 425 bh = NULL; 426 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 427 struct bfs_inode *di; 428 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 429 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 430 unsigned long eblock; 431 432 if (!off) { 433 brelse(bh); 434 bh = sb_bread(s, block); 435 } 436 437 if (!bh) 438 continue; 439 440 di = (struct bfs_inode *)bh->b_data + off; 441 442 /* test if filesystem is not corrupted */ 443 444 i_eoff = le32_to_cpu(di->i_eoffset); 445 i_sblock = le32_to_cpu(di->i_sblock); 446 i_eblock = le32_to_cpu(di->i_eblock); 447 s_size = le32_to_cpu(bfs_sb->s_end); 448 449 if (i_sblock > info->si_blocks || 450 i_eblock > info->si_blocks || 451 i_sblock > i_eblock || 452 i_eoff > s_size || 453 i_sblock * BFS_BSIZE > i_eoff) { 454 455 printf("Inode 0x%08x corrupted\n", i); 456 457 brelse(bh); 458 ret = -EIO; 459 goto out3; 460 } 461 462 if (!di->i_ino) { 463 info->si_freei++; 464 continue; 465 } 466 set_bit(i, info->si_imap); 467 info->si_freeb -= BFS_FILEBLOCKS(di); 468 469 eblock = le32_to_cpu(di->i_eblock); 470 if (eblock > info->si_lf_eblk) 471 info->si_lf_eblk = eblock; 472 } 473 brelse(bh); 474 if (!(s->s_flags & MS_RDONLY)) { 475 mark_buffer_dirty(info->si_sbh); 476 s->s_dirt = 1; 477 } 478 dump_imap("read_super", s); 479 return 0; 480 481 out3: 482 dput(s->s_root); 483 s->s_root = NULL; 484 out2: 485 kfree(info->si_imap); 486 out1: 487 brelse(info->si_sbh); 488 out: 489 mutex_destroy(&info->bfs_lock); 490 kfree(info); 491 s->s_fs_info = NULL; 492 return ret; 493 } 494 495 static int bfs_get_sb(struct file_system_type *fs_type, 496 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 497 { 498 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); 499 } 500 501 static struct file_system_type bfs_fs_type = { 502 .owner = THIS_MODULE, 503 .name = "bfs", 504 .get_sb = bfs_get_sb, 505 .kill_sb = kill_block_super, 506 .fs_flags = FS_REQUIRES_DEV, 507 }; 508 509 static int __init init_bfs_fs(void) 510 { 511 int err = init_inodecache(); 512 if (err) 513 goto out1; 514 err = register_filesystem(&bfs_fs_type); 515 if (err) 516 goto out; 517 return 0; 518 out: 519 destroy_inodecache(); 520 out1: 521 return err; 522 } 523 524 static void __exit exit_bfs_fs(void) 525 { 526 unregister_filesystem(&bfs_fs_type); 527 destroy_inodecache(); 528 } 529 530 module_init(init_bfs_fs) 531 module_exit(exit_bfs_fs) 532