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