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, ino); 52 make_bad_inode(inode); 53 return; 54 } 55 56 off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 57 di = (struct bfs_inode *)bh->b_data + off; 58 59 inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); 60 if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { 61 inode->i_mode |= S_IFDIR; 62 inode->i_op = &bfs_dir_inops; 63 inode->i_fop = &bfs_dir_operations; 64 } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { 65 inode->i_mode |= S_IFREG; 66 inode->i_op = &bfs_file_inops; 67 inode->i_fop = &bfs_file_operations; 68 inode->i_mapping->a_ops = &bfs_aops; 69 } 70 71 BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); 72 BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); 73 inode->i_uid = le32_to_cpu(di->i_uid); 74 inode->i_gid = le32_to_cpu(di->i_gid); 75 inode->i_nlink = le32_to_cpu(di->i_nlink); 76 inode->i_size = BFS_FILESIZE(di); 77 inode->i_blocks = BFS_FILEBLOCKS(di); 78 if (inode->i_size || inode->i_blocks) dprintf("Registered inode with %lld size, %ld blocks\n", inode->i_size, inode->i_blocks); 79 inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); 80 inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); 81 inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); 82 inode->i_atime.tv_nsec = 0; 83 inode->i_mtime.tv_nsec = 0; 84 inode->i_ctime.tv_nsec = 0; 85 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */ 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", inode->i_sb->s_id, ino); 110 unlock_kernel(); 111 return -EIO; 112 } 113 114 off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; 115 di = (struct bfs_inode *)bh->b_data + off; 116 117 if (ino == BFS_ROOT_INO) 118 di->i_vtype = cpu_to_le32(BFS_VDIR); 119 else 120 di->i_vtype = cpu_to_le32(BFS_VREG); 121 122 di->i_ino = cpu_to_le16(ino); 123 di->i_mode = cpu_to_le32(inode->i_mode); 124 di->i_uid = cpu_to_le32(inode->i_uid); 125 di->i_gid = cpu_to_le32(inode->i_gid); 126 di->i_nlink = cpu_to_le32(inode->i_nlink); 127 di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); 128 di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); 129 di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); 130 i_sblock = BFS_I(inode)->i_sblock; 131 di->i_sblock = cpu_to_le32(i_sblock); 132 di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); 133 di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); 134 135 mark_buffer_dirty(bh); 136 dprintf("Written ino=%d into %d:%d\n",le16_to_cpu(di->i_ino),block,off); 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 block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; 166 bh = sb_bread(s, block); 167 if (!bh) { 168 printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino); 169 unlock_kernel(); 170 return; 171 } 172 off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; 173 di = (struct bfs_inode *) bh->b_data + off; 174 if (bi->i_dsk_ino) { 175 info->si_freeb += 1 + bi->i_eblock - bi->i_sblock; 176 info->si_freei++; 177 clear_bit(ino, info->si_imap); 178 dump_imap("delete_inode", s); 179 } 180 di->i_ino = 0; 181 di->i_sblock = 0; 182 mark_buffer_dirty(bh); 183 brelse(bh); 184 185 /* if this was the last file, make the previous 186 block "last files last block" even if there is no real file there, 187 saves us 1 gap */ 188 if (info->si_lf_eblk == BFS_I(inode)->i_eblock) { 189 info->si_lf_eblk = BFS_I(inode)->i_sblock - 1; 190 mark_buffer_dirty(info->si_sbh); 191 } 192 unlock_kernel(); 193 clear_inode(inode); 194 } 195 196 static void bfs_put_super(struct super_block *s) 197 { 198 struct bfs_sb_info *info = BFS_SB(s); 199 brelse(info->si_sbh); 200 kfree(info->si_imap); 201 kfree(info); 202 s->s_fs_info = NULL; 203 } 204 205 static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) 206 { 207 struct super_block *s = dentry->d_sb; 208 struct bfs_sb_info *info = BFS_SB(s); 209 u64 id = huge_encode_dev(s->s_bdev->bd_dev); 210 buf->f_type = BFS_MAGIC; 211 buf->f_bsize = s->s_blocksize; 212 buf->f_blocks = info->si_blocks; 213 buf->f_bfree = buf->f_bavail = info->si_freeb; 214 buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; 215 buf->f_ffree = info->si_freei; 216 buf->f_fsid.val[0] = (u32)id; 217 buf->f_fsid.val[1] = (u32)(id >> 32); 218 buf->f_namelen = BFS_NAMELEN; 219 return 0; 220 } 221 222 static void bfs_write_super(struct super_block *s) 223 { 224 lock_kernel(); 225 if (!(s->s_flags & MS_RDONLY)) 226 mark_buffer_dirty(BFS_SB(s)->si_sbh); 227 s->s_dirt = 0; 228 unlock_kernel(); 229 } 230 231 static struct kmem_cache * bfs_inode_cachep; 232 233 static struct inode *bfs_alloc_inode(struct super_block *sb) 234 { 235 struct bfs_inode_info *bi; 236 bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); 237 if (!bi) 238 return NULL; 239 return &bi->vfs_inode; 240 } 241 242 static void bfs_destroy_inode(struct inode *inode) 243 { 244 kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); 245 } 246 247 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) 248 { 249 struct bfs_inode_info *bi = foo; 250 251 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 252 SLAB_CTOR_CONSTRUCTOR) 253 inode_init_once(&bi->vfs_inode); 254 } 255 256 static int init_inodecache(void) 257 { 258 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 259 sizeof(struct bfs_inode_info), 260 0, (SLAB_RECLAIM_ACCOUNT| 261 SLAB_MEM_SPREAD), 262 init_once, NULL); 263 if (bfs_inode_cachep == NULL) 264 return -ENOMEM; 265 return 0; 266 } 267 268 static void destroy_inodecache(void) 269 { 270 kmem_cache_destroy(bfs_inode_cachep); 271 } 272 273 static struct super_operations bfs_sops = { 274 .alloc_inode = bfs_alloc_inode, 275 .destroy_inode = bfs_destroy_inode, 276 .read_inode = bfs_read_inode, 277 .write_inode = bfs_write_inode, 278 .delete_inode = bfs_delete_inode, 279 .put_super = bfs_put_super, 280 .write_super = bfs_write_super, 281 .statfs = bfs_statfs, 282 }; 283 284 void dump_imap(const char *prefix, struct super_block * s) 285 { 286 #ifdef DEBUG 287 int i; 288 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 289 290 if (!tmpbuf) 291 return; 292 for (i=BFS_SB(s)->si_lasti; i>=0; i--) { 293 if (i > PAGE_SIZE-100) break; 294 if (test_bit(i, BFS_SB(s)->si_imap)) 295 strcat(tmpbuf, "1"); 296 else 297 strcat(tmpbuf, "0"); 298 } 299 printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf); 300 free_page((unsigned long)tmpbuf); 301 #endif 302 } 303 304 static int bfs_fill_super(struct super_block *s, void *data, int silent) 305 { 306 struct buffer_head * bh; 307 struct bfs_super_block * bfs_sb; 308 struct inode * inode; 309 unsigned i, imap_len; 310 struct bfs_sb_info * info; 311 312 info = kzalloc(sizeof(*info), GFP_KERNEL); 313 if (!info) 314 return -ENOMEM; 315 s->s_fs_info = info; 316 317 sb_set_blocksize(s, BFS_BSIZE); 318 319 bh = sb_bread(s, 0); 320 if(!bh) 321 goto out; 322 bfs_sb = (struct bfs_super_block *)bh->b_data; 323 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 324 if (!silent) 325 printf("No BFS filesystem on %s (magic=%08x)\n", 326 s->s_id, le32_to_cpu(bfs_sb->s_magic)); 327 goto out; 328 } 329 if (BFS_UNCLEAN(bfs_sb, s) && !silent) 330 printf("%s is unclean, continuing\n", s->s_id); 331 332 s->s_magic = BFS_MAGIC; 333 info->si_sbh = bh; 334 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE)/sizeof(struct bfs_inode) 335 + BFS_ROOT_INO - 1; 336 337 imap_len = info->si_lasti/8 + 1; 338 info->si_imap = kzalloc(imap_len, GFP_KERNEL); 339 if (!info->si_imap) 340 goto out; 341 for (i=0; i<BFS_ROOT_INO; i++) 342 set_bit(i, info->si_imap); 343 344 s->s_op = &bfs_sops; 345 inode = iget(s, BFS_ROOT_INO); 346 if (!inode) { 347 kfree(info->si_imap); 348 goto out; 349 } 350 s->s_root = d_alloc_root(inode); 351 if (!s->s_root) { 352 iput(inode); 353 kfree(info->si_imap); 354 goto out; 355 } 356 357 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */ 358 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start))>>BFS_BSIZE_BITS; 359 info->si_freei = 0; 360 info->si_lf_eblk = 0; 361 info->si_lf_sblk = 0; 362 info->si_lf_ioff = 0; 363 bh = NULL; 364 for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) { 365 struct bfs_inode *di; 366 int block = (i - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; 367 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 368 unsigned long sblock, eblock; 369 370 if (!off) { 371 brelse(bh); 372 bh = sb_bread(s, block); 373 } 374 375 if (!bh) 376 continue; 377 378 di = (struct bfs_inode *)bh->b_data + off; 379 380 if (!di->i_ino) { 381 info->si_freei++; 382 continue; 383 } 384 set_bit(i, info->si_imap); 385 info->si_freeb -= BFS_FILEBLOCKS(di); 386 387 sblock = le32_to_cpu(di->i_sblock); 388 eblock = le32_to_cpu(di->i_eblock); 389 if (eblock > info->si_lf_eblk) { 390 info->si_lf_eblk = eblock; 391 info->si_lf_sblk = sblock; 392 info->si_lf_ioff = BFS_INO2OFF(i); 393 } 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