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