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_CONSTRUCTOR) 252 inode_init_once(&bi->vfs_inode); 253 } 254 255 static int init_inodecache(void) 256 { 257 bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", 258 sizeof(struct bfs_inode_info), 259 0, (SLAB_RECLAIM_ACCOUNT| 260 SLAB_MEM_SPREAD), 261 init_once, NULL); 262 if (bfs_inode_cachep == NULL) 263 return -ENOMEM; 264 return 0; 265 } 266 267 static void destroy_inodecache(void) 268 { 269 kmem_cache_destroy(bfs_inode_cachep); 270 } 271 272 static const struct super_operations bfs_sops = { 273 .alloc_inode = bfs_alloc_inode, 274 .destroy_inode = bfs_destroy_inode, 275 .read_inode = bfs_read_inode, 276 .write_inode = bfs_write_inode, 277 .delete_inode = bfs_delete_inode, 278 .put_super = bfs_put_super, 279 .write_super = bfs_write_super, 280 .statfs = bfs_statfs, 281 }; 282 283 void dump_imap(const char *prefix, struct super_block * s) 284 { 285 #ifdef DEBUG 286 int i; 287 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 288 289 if (!tmpbuf) 290 return; 291 for (i=BFS_SB(s)->si_lasti; i>=0; i--) { 292 if (i > PAGE_SIZE-100) break; 293 if (test_bit(i, BFS_SB(s)->si_imap)) 294 strcat(tmpbuf, "1"); 295 else 296 strcat(tmpbuf, "0"); 297 } 298 printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf); 299 free_page((unsigned long)tmpbuf); 300 #endif 301 } 302 303 static int bfs_fill_super(struct super_block *s, void *data, int silent) 304 { 305 struct buffer_head * bh; 306 struct bfs_super_block * bfs_sb; 307 struct inode * inode; 308 unsigned i, imap_len; 309 struct bfs_sb_info * info; 310 311 info = kzalloc(sizeof(*info), GFP_KERNEL); 312 if (!info) 313 return -ENOMEM; 314 s->s_fs_info = info; 315 316 sb_set_blocksize(s, BFS_BSIZE); 317 318 bh = sb_bread(s, 0); 319 if(!bh) 320 goto out; 321 bfs_sb = (struct bfs_super_block *)bh->b_data; 322 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 323 if (!silent) 324 printf("No BFS filesystem on %s (magic=%08x)\n", 325 s->s_id, le32_to_cpu(bfs_sb->s_magic)); 326 goto out; 327 } 328 if (BFS_UNCLEAN(bfs_sb, s) && !silent) 329 printf("%s is unclean, continuing\n", s->s_id); 330 331 s->s_magic = BFS_MAGIC; 332 info->si_sbh = bh; 333 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE)/sizeof(struct bfs_inode) 334 + BFS_ROOT_INO - 1; 335 336 imap_len = info->si_lasti/8 + 1; 337 info->si_imap = kzalloc(imap_len, GFP_KERNEL); 338 if (!info->si_imap) 339 goto out; 340 for (i=0; i<BFS_ROOT_INO; i++) 341 set_bit(i, info->si_imap); 342 343 s->s_op = &bfs_sops; 344 inode = iget(s, BFS_ROOT_INO); 345 if (!inode) { 346 kfree(info->si_imap); 347 goto out; 348 } 349 s->s_root = d_alloc_root(inode); 350 if (!s->s_root) { 351 iput(inode); 352 kfree(info->si_imap); 353 goto out; 354 } 355 356 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */ 357 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start))>>BFS_BSIZE_BITS; 358 info->si_freei = 0; 359 info->si_lf_eblk = 0; 360 info->si_lf_sblk = 0; 361 info->si_lf_ioff = 0; 362 bh = NULL; 363 for (i=BFS_ROOT_INO; i<=info->si_lasti; i++) { 364 struct bfs_inode *di; 365 int block = (i - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; 366 int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; 367 unsigned long sblock, eblock; 368 369 if (!off) { 370 brelse(bh); 371 bh = sb_bread(s, block); 372 } 373 374 if (!bh) 375 continue; 376 377 di = (struct bfs_inode *)bh->b_data + off; 378 379 if (!di->i_ino) { 380 info->si_freei++; 381 continue; 382 } 383 set_bit(i, info->si_imap); 384 info->si_freeb -= BFS_FILEBLOCKS(di); 385 386 sblock = le32_to_cpu(di->i_sblock); 387 eblock = le32_to_cpu(di->i_eblock); 388 if (eblock > info->si_lf_eblk) { 389 info->si_lf_eblk = eblock; 390 info->si_lf_sblk = sblock; 391 info->si_lf_ioff = BFS_INO2OFF(i); 392 } 393 } 394 brelse(bh); 395 if (!(s->s_flags & MS_RDONLY)) { 396 mark_buffer_dirty(info->si_sbh); 397 s->s_dirt = 1; 398 } 399 dump_imap("read_super", s); 400 return 0; 401 402 out: 403 brelse(bh); 404 kfree(info); 405 s->s_fs_info = NULL; 406 return -EINVAL; 407 } 408 409 static int bfs_get_sb(struct file_system_type *fs_type, 410 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 411 { 412 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); 413 } 414 415 static struct file_system_type bfs_fs_type = { 416 .owner = THIS_MODULE, 417 .name = "bfs", 418 .get_sb = bfs_get_sb, 419 .kill_sb = kill_block_super, 420 .fs_flags = FS_REQUIRES_DEV, 421 }; 422 423 static int __init init_bfs_fs(void) 424 { 425 int err = init_inodecache(); 426 if (err) 427 goto out1; 428 err = register_filesystem(&bfs_fs_type); 429 if (err) 430 goto out; 431 return 0; 432 out: 433 destroy_inodecache(); 434 out1: 435 return err; 436 } 437 438 static void __exit exit_bfs_fs(void) 439 { 440 unregister_filesystem(&bfs_fs_type); 441 destroy_inodecache(); 442 } 443 444 module_init(init_bfs_fs) 445 module_exit(exit_bfs_fs) 446