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 brelse(info->si_sbh); 217 mutex_destroy(&info->bfs_lock); 218 kfree(info->si_imap); 219 kfree(info); 220 s->s_fs_info = NULL; 221 } 222 223 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 224 { 225 struct super_block *s = dentry->d_sb; 226 struct bfs_sb_info *info = BFS_SB(s); 227 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 228 buf->f_type = BFS_MAGIC; 229 buf->f_bsize = s->s_blocksize; 230 buf->f_blocks = info->si_blocks; 231 buf->f_bfree = buf->f_bavail = info->si_freeb; 232 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 233 buf->f_ffree = info->si_freei; 234 buf->f_fsid.val[0] = (u32)id; 235 buf->f_fsid.val[1] = (u32)(id >> 32); 236 buf->f_namelen = BFS_NAMELEN; 237 return 0; 238 } 239 240 static void bfs_write_super(struct super_block *s) 241 { 242 struct bfs_sb_info *info = BFS_SB(s); 243 244 mutex_lock(&info->bfs_lock); 245 if (!(s->s_flags & MS_RDONLY)) 246 mark_buffer_dirty(info->si_sbh); 247 s->s_dirt = 0; 248 mutex_unlock(&info->bfs_lock); 249 } 250 251 static struct kmem_cache *bfs_inode_cachep; 252 253 static struct inode *bfs_alloc_inode(struct super_block *sb) 254 { 255 struct bfs_inode_info *bi; 256 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 257 if (!bi) 258 return NULL; 259 return &bi->vfs_inode; 260 } 261 262 static void bfs_destroy_inode(struct inode *inode) 263 { 264 kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 265 } 266 267 static void init_once(void *foo) 268 { 269 struct bfs_inode_info *bi = foo; 270 271 inode_init_once(&bi->vfs_inode); 272 } 273 274 static int init_inodecache(void) 275 { 276 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 277 sizeof(struct bfs_inode_info), 278 0, (SLAB_RECLAIM_ACCOUNT| 279 SLAB_MEM_SPREAD), 280 init_once); 281 if (bfs_inode_cachep == NULL) 282 return -ENOMEM; 283 return 0; 284 } 285 286 static void destroy_inodecache(void) 287 { 288 kmem_cache_destroy(bfs_inode_cachep); 289 } 290 291 static const struct super_operations bfs_sops = { 292 .alloc_inode = bfs_alloc_inode, 293 .destroy_inode = bfs_destroy_inode, 294 .write_inode = bfs_write_inode, 295 .delete_inode = bfs_delete_inode, 296 .put_super = bfs_put_super, 297 .write_super = bfs_write_super, 298 .statfs = bfs_statfs, 299 }; 300 301 void dump_imap(const char *prefix, struct super_block *s) 302 { 303 #ifdef DEBUG 304 int i; 305 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 306 307 if (!tmpbuf) 308 return; 309 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 310 if (i > PAGE_SIZE - 100) break; 311 if (test_bit(i, BFS_SB(s)->si_imap)) 312 strcat(tmpbuf, "1"); 313 else 314 strcat(tmpbuf, "0"); 315 } 316 printf("BFS-fs: %s: lasti=%08lx <%s>\n", 317 prefix, BFS_SB(s)->si_lasti, tmpbuf); 318 free_page((unsigned long)tmpbuf); 319 #endif 320 } 321 322 static int bfs_fill_super(struct super_block *s, void *data, int silent) 323 { 324 struct buffer_head *bh; 325 struct bfs_super_block *bfs_sb; 326 struct inode *inode; 327 unsigned i, imap_len; 328 struct bfs_sb_info *info; 329 long ret = -EINVAL; 330 331 info = kzalloc(sizeof(*info), GFP_KERNEL); 332 if (!info) 333 return -ENOMEM; 334 s->s_fs_info = info; 335 336 sb_set_blocksize(s, BFS_BSIZE); 337 338 bh = sb_bread(s, 0); 339 if(!bh) 340 goto out; 341 bfs_sb = (struct bfs_super_block *)bh->b_data; 342 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 343 if (!silent) 344 printf("No BFS filesystem on %s (magic=%08x)\n", 345 s->s_id, le32_to_cpu(bfs_sb->s_magic)); 346 goto out; 347 } 348 if (BFS_UNCLEAN(bfs_sb, s) && !silent) 349 printf("%s is unclean, continuing\n", s->s_id); 350 351 s->s_magic = BFS_MAGIC; 352 info->si_sbh = bh; 353 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / 354 sizeof(struct bfs_inode) 355 + BFS_ROOT_INO - 1; 356 imap_len = (info->si_lasti / 8) + 1; 357 info->si_imap = kzalloc(imap_len, GFP_KERNEL); 358 if (!info->si_imap) 359 goto out; 360 for (i = 0; i < BFS_ROOT_INO; i++) 361 set_bit(i, info->si_imap); 362 363 s->s_op = &bfs_sops; 364 inode = bfs_iget(s, BFS_ROOT_INO); 365 if (IS_ERR(inode)) { 366 ret = PTR_ERR(inode); 367 kfree(info->si_imap); 368 goto out; 369 } 370 s->s_root = d_alloc_root(inode); 371 if (!s->s_root) { 372 iput(inode); 373 ret = -ENOMEM; 374 kfree(info->si_imap); 375 goto out; 376 } 377 378 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 379 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 380 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 381 info->si_freei = 0; 382 info->si_lf_eblk = 0; 383 bh = NULL; 384 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 385 struct bfs_inode *di; 386 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 387 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 388 unsigned long eblock; 389 390 if (!off) { 391 brelse(bh); 392 bh = sb_bread(s, block); 393 } 394 395 if (!bh) 396 continue; 397 398 di = (struct bfs_inode *)bh->b_data + off; 399 400 if (!di->i_ino) { 401 info->si_freei++; 402 continue; 403 } 404 set_bit(i, info->si_imap); 405 info->si_freeb -= BFS_FILEBLOCKS(di); 406 407 eblock = le32_to_cpu(di->i_eblock); 408 if (eblock > info->si_lf_eblk) 409 info->si_lf_eblk = eblock; 410 } 411 brelse(bh); 412 if (!(s->s_flags & MS_RDONLY)) { 413 mark_buffer_dirty(info->si_sbh); 414 s->s_dirt = 1; 415 } 416 dump_imap("read_super", s); 417 mutex_init(&info->bfs_lock); 418 return 0; 419 420 out: 421 brelse(bh); 422 kfree(info); 423 s->s_fs_info = NULL; 424 return ret; 425 } 426 427 static int bfs_get_sb(struct file_system_type *fs_type, 428 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 429 { 430 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); 431 } 432 433 static struct file_system_type bfs_fs_type = { 434 .owner = THIS_MODULE, 435 .name = "bfs", 436 .get_sb = bfs_get_sb, 437 .kill_sb = kill_block_super, 438 .fs_flags = FS_REQUIRES_DEV, 439 }; 440 441 static int __init init_bfs_fs(void) 442 { 443 int err = init_inodecache(); 444 if (err) 445 goto out1; 446 err = register_filesystem(&bfs_fs_type); 447 if (err) 448 goto out; 449 return 0; 450 out: 451 destroy_inodecache(); 452 out1: 453 return err; 454 } 455 456 static void __exit exit_bfs_fs(void) 457 { 458 unregister_filesystem(&bfs_fs_type); 459 destroy_inodecache(); 460 } 461 462 module_init(init_bfs_fs) 463 module_exit(exit_bfs_fs) 464