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 long 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 s->s_fs_info = info; 363 364 sb_set_blocksize(s, BFS_BSIZE); 365 366 bh = sb_bread(s, 0); 367 if(!bh) 368 goto out; 369 bfs_sb = (struct bfs_super_block *)bh->b_data; 370 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 371 if (!silent) 372 printf("No BFS filesystem on %s (magic=%08x)\n", 373 s->s_id, le32_to_cpu(bfs_sb->s_magic)); 374 goto out; 375 } 376 if (BFS_UNCLEAN(bfs_sb, s) && !silent) 377 printf("%s is unclean, continuing\n", s->s_id); 378 379 s->s_magic = BFS_MAGIC; 380 info->si_sbh = bh; 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 out; 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 out; 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 kfree(info->si_imap); 402 goto out; 403 } 404 s->s_root = d_alloc_root(inode); 405 if (!s->s_root) { 406 iput(inode); 407 ret = -ENOMEM; 408 kfree(info->si_imap); 409 goto out; 410 } 411 412 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 413 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 414 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 415 info->si_freei = 0; 416 info->si_lf_eblk = 0; 417 418 /* can we read the last block? */ 419 bh = sb_bread(s, info->si_blocks - 1); 420 if (!bh) { 421 printf("Last block not available: %lu\n", info->si_blocks - 1); 422 iput(inode); 423 ret = -EIO; 424 kfree(info->si_imap); 425 goto out; 426 } 427 brelse(bh); 428 429 bh = NULL; 430 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 431 struct bfs_inode *di; 432 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 433 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 434 unsigned long eblock; 435 436 if (!off) { 437 brelse(bh); 438 bh = sb_bread(s, block); 439 } 440 441 if (!bh) 442 continue; 443 444 di = (struct bfs_inode *)bh->b_data + off; 445 446 /* test if filesystem is not corrupted */ 447 448 i_eoff = le32_to_cpu(di->i_eoffset); 449 i_sblock = le32_to_cpu(di->i_sblock); 450 i_eblock = le32_to_cpu(di->i_eblock); 451 s_size = le32_to_cpu(bfs_sb->s_end); 452 453 if (i_sblock > info->si_blocks || 454 i_eblock > info->si_blocks || 455 i_sblock > i_eblock || 456 i_eoff > s_size || 457 i_sblock * BFS_BSIZE > i_eoff) { 458 459 printf("Inode 0x%08x corrupted\n", i); 460 461 brelse(bh); 462 s->s_root = NULL; 463 kfree(info->si_imap); 464 kfree(info); 465 s->s_fs_info = NULL; 466 return -EIO; 467 } 468 469 if (!di->i_ino) { 470 info->si_freei++; 471 continue; 472 } 473 set_bit(i, info->si_imap); 474 info->si_freeb -= BFS_FILEBLOCKS(di); 475 476 eblock = le32_to_cpu(di->i_eblock); 477 if (eblock > info->si_lf_eblk) 478 info->si_lf_eblk = eblock; 479 } 480 brelse(bh); 481 if (!(s->s_flags & MS_RDONLY)) { 482 mark_buffer_dirty(info->si_sbh); 483 s->s_dirt = 1; 484 } 485 dump_imap("read_super", s); 486 mutex_init(&info->bfs_lock); 487 return 0; 488 489 out: 490 brelse(bh); 491 kfree(info); 492 s->s_fs_info = NULL; 493 return ret; 494 } 495 496 static int bfs_get_sb(struct file_system_type *fs_type, 497 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 498 { 499 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); 500 } 501 502 static struct file_system_type bfs_fs_type = { 503 .owner = THIS_MODULE, 504 .name = "bfs", 505 .get_sb = bfs_get_sb, 506 .kill_sb = kill_block_super, 507 .fs_flags = FS_REQUIRES_DEV, 508 }; 509 510 static int __init init_bfs_fs(void) 511 { 512 int err = init_inodecache(); 513 if (err) 514 goto out1; 515 err = register_filesystem(&bfs_fs_type); 516 if (err) 517 goto out; 518 return 0; 519 out: 520 destroy_inodecache(); 521 out1: 522 return err; 523 } 524 525 static void __exit exit_bfs_fs(void) 526 { 527 unregister_filesystem(&bfs_fs_type); 528 destroy_inodecache(); 529 } 530 531 module_init(init_bfs_fs) 532 module_exit(exit_bfs_fs) 533