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; 107 108 dprintf("ino=%08x\n", ino); 109 110 if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { 111 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino); 112 return -EIO; 113 } 114 115 lock_kernel(); 116 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 117 bh = sb_bread(inode->i_sb, block); 118 if (!bh) { 119 printf("Unable to read inode %s:%08x\n", 120 inode->i_sb->s_id, ino); 121 unlock_kernel(); 122 return -EIO; 123 } 124 125 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 126 di = (struct bfs_inode *)bh->b_data + off; 127 128 if (ino == BFS_ROOT_INO) 129 di->i_vtype = cpu_to_le32(BFS_VDIR); 130 else 131 di->i_vtype = cpu_to_le32(BFS_VREG); 132 133 di->i_ino = cpu_to_le16(ino); 134 di->i_mode = cpu_to_le32(inode->i_mode); 135 di->i_uid = cpu_to_le32(inode->i_uid); 136 di->i_gid = cpu_to_le32(inode->i_gid); 137 di->i_nlink = cpu_to_le32(inode->i_nlink); 138 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); 139 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 140 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 141 i_sblock = BFS_I(inode)->i_sblock; 142 di->i_sblock = cpu_to_le32(i_sblock); 143 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); 144 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); 145 146 mark_buffer_dirty(bh); 147 brelse(bh); 148 unlock_kernel(); 149 return 0; 150 } 151 152 static void bfs_delete_inode(struct inode *inode) 153 { 154 unsigned long ino = inode->i_ino; 155 struct bfs_inode *di; 156 struct buffer_head *bh; 157 int block, off; 158 struct super_block *s = inode->i_sb; 159 struct bfs_sb_info *info = BFS_SB(s); 160 struct bfs_inode_info *bi = BFS_I(inode); 161 162 dprintf("ino=%08lx\n", ino); 163 164 truncate_inode_pages(&inode->i_data, 0); 165 166 if ((ino < BFS_ROOT_INO) || (ino > info->si_lasti)) { 167 printf("invalid ino=%08lx\n", ino); 168 return; 169 } 170 171 inode->i_size = 0; 172 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; 173 lock_kernel(); 174 mark_inode_dirty(inode); 175 176 block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 177 bh = sb_bread(s, block); 178 if (!bh) { 179 printf("Unable to read inode %s:%08lx\n", 180 inode->i_sb->s_id, ino); 181 unlock_kernel(); 182 return; 183 } 184 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 185 di = (struct bfs_inode *)bh->b_data + off; 186 memset((void *)di, 0, sizeof(struct bfs_inode)); 187 mark_buffer_dirty(bh); 188 brelse(bh); 189 190 if (bi->i_dsk_ino) { 191 if (bi->i_sblock) 192 info->si_freeb += bi->i_eblock + 1 - bi->i_sblock; 193 info->si_freei++; 194 clear_bit(ino, info->si_imap); 195 dump_imap("delete_inode", s); 196 } 197 198 /* 199 * If this was the last file, make the previous block 200 * "last block of the last file" even if there is no 201 * real file there, saves us 1 gap. 202 */ 203 if (info->si_lf_eblk == bi->i_eblock) { 204 info->si_lf_eblk = bi->i_sblock - 1; 205 mark_buffer_dirty(info->si_sbh); 206 } 207 unlock_kernel(); 208 clear_inode(inode); 209 } 210 211 static void bfs_put_super(struct super_block *s) 212 { 213 struct bfs_sb_info *info = BFS_SB(s); 214 brelse(info->si_sbh); 215 kfree(info->si_imap); 216 kfree(info); 217 s->s_fs_info = NULL; 218 } 219 220 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 221 { 222 struct super_block *s = dentry->d_sb; 223 struct bfs_sb_info *info = BFS_SB(s); 224 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 225 buf->f_type = BFS_MAGIC; 226 buf->f_bsize = s->s_blocksize; 227 buf->f_blocks = info->si_blocks; 228 buf->f_bfree = buf->f_bavail = info->si_freeb; 229 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 230 buf->f_ffree = info->si_freei; 231 buf->f_fsid.val[0] = (u32)id; 232 buf->f_fsid.val[1] = (u32)(id >> 32); 233 buf->f_namelen = BFS_NAMELEN; 234 return 0; 235 } 236 237 static void bfs_write_super(struct super_block *s) 238 { 239 lock_kernel(); 240 if (!(s->s_flags & MS_RDONLY)) 241 mark_buffer_dirty(BFS_SB(s)->si_sbh); 242 s->s_dirt = 0; 243 unlock_kernel(); 244 } 245 246 static struct kmem_cache *bfs_inode_cachep; 247 248 static struct inode *bfs_alloc_inode(struct super_block *sb) 249 { 250 struct bfs_inode_info *bi; 251 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 252 if (!bi) 253 return NULL; 254 return &bi->vfs_inode; 255 } 256 257 static void bfs_destroy_inode(struct inode *inode) 258 { 259 kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 260 } 261 262 static void init_once(struct kmem_cache *cachep, void *foo) 263 { 264 struct bfs_inode_info *bi = foo; 265 266 inode_init_once(&bi->vfs_inode); 267 } 268 269 static int init_inodecache(void) 270 { 271 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 272 sizeof(struct bfs_inode_info), 273 0, (SLAB_RECLAIM_ACCOUNT| 274 SLAB_MEM_SPREAD), 275 init_once); 276 if (bfs_inode_cachep == NULL) 277 return -ENOMEM; 278 return 0; 279 } 280 281 static void destroy_inodecache(void) 282 { 283 kmem_cache_destroy(bfs_inode_cachep); 284 } 285 286 static const struct super_operations bfs_sops = { 287 .alloc_inode = bfs_alloc_inode, 288 .destroy_inode = bfs_destroy_inode, 289 .write_inode = bfs_write_inode, 290 .delete_inode = bfs_delete_inode, 291 .put_super = bfs_put_super, 292 .write_super = bfs_write_super, 293 .statfs = bfs_statfs, 294 }; 295 296 void dump_imap(const char *prefix, struct super_block *s) 297 { 298 #ifdef DEBUG 299 int i; 300 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 301 302 if (!tmpbuf) 303 return; 304 for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { 305 if (i > PAGE_SIZE - 100) break; 306 if (test_bit(i, BFS_SB(s)->si_imap)) 307 strcat(tmpbuf, "1"); 308 else 309 strcat(tmpbuf, "0"); 310 } 311 printf("BFS-fs: %s: lasti=%08lx <%s>\n", 312 prefix, BFS_SB(s)->si_lasti, tmpbuf); 313 free_page((unsigned long)tmpbuf); 314 #endif 315 } 316 317 static int bfs_fill_super(struct super_block *s, void *data, int silent) 318 { 319 struct buffer_head *bh; 320 struct bfs_super_block *bfs_sb; 321 struct inode *inode; 322 unsigned i, imap_len; 323 struct bfs_sb_info *info; 324 long ret = -EINVAL; 325 326 info = kzalloc(sizeof(*info), GFP_KERNEL); 327 if (!info) 328 return -ENOMEM; 329 s->s_fs_info = info; 330 331 sb_set_blocksize(s, BFS_BSIZE); 332 333 bh = sb_bread(s, 0); 334 if(!bh) 335 goto out; 336 bfs_sb = (struct bfs_super_block *)bh->b_data; 337 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 338 if (!silent) 339 printf("No BFS filesystem on %s (magic=%08x)\n", 340 s->s_id, le32_to_cpu(bfs_sb->s_magic)); 341 goto out; 342 } 343 if (BFS_UNCLEAN(bfs_sb, s) && !silent) 344 printf("%s is unclean, continuing\n", s->s_id); 345 346 s->s_magic = BFS_MAGIC; 347 info->si_sbh = bh; 348 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / 349 sizeof(struct bfs_inode) 350 + BFS_ROOT_INO - 1; 351 imap_len = (info->si_lasti / 8) + 1; 352 info->si_imap = kzalloc(imap_len, GFP_KERNEL); 353 if (!info->si_imap) 354 goto out; 355 for (i = 0; i < BFS_ROOT_INO; i++) 356 set_bit(i, info->si_imap); 357 358 s->s_op = &bfs_sops; 359 inode = bfs_iget(s, BFS_ROOT_INO); 360 if (IS_ERR(inode)) { 361 ret = PTR_ERR(inode); 362 kfree(info->si_imap); 363 goto out; 364 } 365 s->s_root = d_alloc_root(inode); 366 if (!s->s_root) { 367 iput(inode); 368 ret = -ENOMEM; 369 kfree(info->si_imap); 370 goto out; 371 } 372 373 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; 374 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 375 - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; 376 info->si_freei = 0; 377 info->si_lf_eblk = 0; 378 bh = NULL; 379 for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { 380 struct bfs_inode *di; 381 int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; 382 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 383 unsigned long sblock, eblock; 384 385 if (!off) { 386 brelse(bh); 387 bh = sb_bread(s, block); 388 } 389 390 if (!bh) 391 continue; 392 393 di = (struct bfs_inode *)bh->b_data + off; 394 395 if (!di->i_ino) { 396 info->si_freei++; 397 continue; 398 } 399 set_bit(i, info->si_imap); 400 info->si_freeb -= BFS_FILEBLOCKS(di); 401 402 sblock = le32_to_cpu(di->i_sblock); 403 eblock = le32_to_cpu(di->i_eblock); 404 if (eblock > info->si_lf_eblk) 405 info->si_lf_eblk = eblock; 406 } 407 brelse(bh); 408 if (!(s->s_flags & MS_RDONLY)) { 409 mark_buffer_dirty(info->si_sbh); 410 s->s_dirt = 1; 411 } 412 dump_imap("read_super", s); 413 return 0; 414 415 out: 416 brelse(bh); 417 kfree(info); 418 s->s_fs_info = NULL; 419 return ret; 420 } 421 422 static int bfs_get_sb(struct file_system_type *fs_type, 423 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 424 { 425 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); 426 } 427 428 static struct file_system_type bfs_fs_type = { 429 .owner = THIS_MODULE, 430 .name = "bfs", 431 .get_sb = bfs_get_sb, 432 .kill_sb = kill_block_super, 433 .fs_flags = FS_REQUIRES_DEV, 434 }; 435 436 static int __init init_bfs_fs(void) 437 { 438 int err = init_inodecache(); 439 if (err) 440 goto out1; 441 err = register_filesystem(&bfs_fs_type); 442 if (err) 443 goto out; 444 return 0; 445 out: 446 destroy_inodecache(); 447 out1: 448 return err; 449 } 450 451 static void __exit exit_bfs_fs(void) 452 { 453 unregister_filesystem(&bfs_fs_type); 454 destroy_inodecache(); 455 } 456 457 module_init(init_bfs_fs) 458 module_exit(exit_bfs_fs) 459