1 /* 2 * fs/bfs/inode.c 3 * BFS superblock and inode operations. 4 * Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com> 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 A. Aivazian <tigran@veritas.com>"); 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_blksize = PAGE_SIZE; 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 BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */ 87 88 brelse(bh); 89 } 90 91 static int bfs_write_inode(struct inode * inode, int unused) 92 { 93 unsigned int ino = (u16)inode->i_ino; 94 unsigned long i_sblock; 95 struct bfs_inode * di; 96 struct buffer_head * bh; 97 int block, off; 98 99 dprintf("ino=%08x\n", ino); 100 101 if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) { 102 printf("Bad inode number %s:%08x\n", inode->i_sb->s_id, ino); 103 return -EIO; 104 } 105 106 lock_kernel(); 107 block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1; 108 bh = sb_bread(inode->i_sb, block); 109 if (!bh) { 110 printf("Unable to read inode %s:%08x\n", 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 dprintf("Written ino=%d into %d:%d\n",le16_to_cpu(di->i_ino),block,off); 138 brelse(bh); 139 unlock_kernel(); 140 return 0; 141 } 142 143 static void bfs_delete_inode(struct inode * inode) 144 { 145 unsigned long ino = inode->i_ino; 146 struct bfs_inode * di; 147 struct buffer_head * bh; 148 int block, off; 149 struct super_block * s = inode->i_sb; 150 struct bfs_sb_info * info = BFS_SB(s); 151 struct bfs_inode_info * bi = BFS_I(inode); 152 153 dprintf("ino=%08lx\n", ino); 154 155 truncate_inode_pages(&inode->i_data, 0); 156 157 if (ino < BFS_ROOT_INO || ino > info->si_lasti) { 158 printf("invalid ino=%08lx\n", ino); 159 return; 160 } 161 162 inode->i_size = 0; 163 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; 164 lock_kernel(); 165 mark_inode_dirty(inode); 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", inode->i_sb->s_id, ino); 170 unlock_kernel(); 171 return; 172 } 173 off = (ino - BFS_ROOT_INO)%BFS_INODES_PER_BLOCK; 174 di = (struct bfs_inode *) bh->b_data + off; 175 if (bi->i_dsk_ino) { 176 info->si_freeb += 1 + bi->i_eblock - bi->i_sblock; 177 info->si_freei++; 178 clear_bit(ino, info->si_imap); 179 dump_imap("delete_inode", s); 180 } 181 di->i_ino = 0; 182 di->i_sblock = 0; 183 mark_buffer_dirty(bh); 184 brelse(bh); 185 186 /* if this was the last file, make the previous 187 block "last files last block" even if there is no real file there, 188 saves us 1 gap */ 189 if (info->si_lf_eblk == BFS_I(inode)->i_eblock) { 190 info->si_lf_eblk = BFS_I(inode)->i_sblock - 1; 191 mark_buffer_dirty(info->si_sbh); 192 } 193 unlock_kernel(); 194 clear_inode(inode); 195 } 196 197 static void bfs_put_super(struct super_block *s) 198 { 199 struct bfs_sb_info *info = BFS_SB(s); 200 brelse(info->si_sbh); 201 kfree(info->si_imap); 202 kfree(info); 203 s->s_fs_info = NULL; 204 } 205 206 static int bfs_statfs(struct super_block *s, struct kstatfs *buf) 207 { 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 kmem_cache_t * 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, SLAB_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, kmem_cache_t * 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 if (kmem_cache_destroy(bfs_inode_cachep)) 271 printk(KERN_INFO "bfs_inode_cache: not all structures were freed\n"); 272 } 273 274 static struct super_operations bfs_sops = { 275 .alloc_inode = bfs_alloc_inode, 276 .destroy_inode = bfs_destroy_inode, 277 .read_inode = bfs_read_inode, 278 .write_inode = bfs_write_inode, 279 .delete_inode = bfs_delete_inode, 280 .put_super = bfs_put_super, 281 .write_super = bfs_write_super, 282 .statfs = bfs_statfs, 283 }; 284 285 void dump_imap(const char *prefix, struct super_block * s) 286 { 287 #ifdef DEBUG 288 int i; 289 char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); 290 291 if (!tmpbuf) 292 return; 293 for (i=BFS_SB(s)->si_lasti; i>=0; i--) { 294 if (i > PAGE_SIZE-100) break; 295 if (test_bit(i, BFS_SB(s)->si_imap)) 296 strcat(tmpbuf, "1"); 297 else 298 strcat(tmpbuf, "0"); 299 } 300 printk(KERN_ERR "BFS-fs: %s: lasti=%08lx <%s>\n", prefix, BFS_SB(s)->si_lasti, tmpbuf); 301 free_page((unsigned long)tmpbuf); 302 #endif 303 } 304 305 static int bfs_fill_super(struct super_block *s, void *data, int silent) 306 { 307 struct buffer_head * bh; 308 struct bfs_super_block * bfs_sb; 309 struct inode * inode; 310 unsigned i, imap_len; 311 struct bfs_sb_info * info; 312 313 info = kmalloc(sizeof(*info), GFP_KERNEL); 314 if (!info) 315 return -ENOMEM; 316 s->s_fs_info = info; 317 memset(info, 0, sizeof(*info)); 318 319 sb_set_blocksize(s, BFS_BSIZE); 320 321 bh = sb_bread(s, 0); 322 if(!bh) 323 goto out; 324 bfs_sb = (struct bfs_super_block *)bh->b_data; 325 if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { 326 if (!silent) 327 printf("No BFS filesystem on %s (magic=%08x)\n", 328 s->s_id, le32_to_cpu(bfs_sb->s_magic)); 329 goto out; 330 } 331 if (BFS_UNCLEAN(bfs_sb, s) && !silent) 332 printf("%s is unclean, continuing\n", s->s_id); 333 334 s->s_magic = BFS_MAGIC; 335 info->si_sbh = bh; 336 info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE)/sizeof(struct bfs_inode) 337 + BFS_ROOT_INO - 1; 338 339 imap_len = info->si_lasti/8 + 1; 340 info->si_imap = kmalloc(imap_len, GFP_KERNEL); 341 if (!info->si_imap) 342 goto out; 343 memset(info->si_imap, 0, imap_len); 344 for (i=0; i<BFS_ROOT_INO; i++) 345 set_bit(i, info->si_imap); 346 347 s->s_op = &bfs_sops; 348 inode = iget(s, BFS_ROOT_INO); 349 if (!inode) { 350 kfree(info->si_imap); 351 goto out; 352 } 353 s->s_root = d_alloc_root(inode); 354 if (!s->s_root) { 355 iput(inode); 356 kfree(info->si_imap); 357 goto out; 358 } 359 360 info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1)>>BFS_BSIZE_BITS; /* for statfs(2) */ 361 info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 - le32_to_cpu(bfs_sb->s_start))>>BFS_BSIZE_BITS; 362 info->si_freei = 0; 363 info->si_lf_eblk = 0; 364 info->si_lf_sblk = 0; 365 info->si_lf_ioff = 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 info->si_lf_sblk = sblock; 395 info->si_lf_ioff = BFS_INO2OFF(i); 396 } 397 } 398 brelse(bh); 399 if (!(s->s_flags & MS_RDONLY)) { 400 mark_buffer_dirty(info->si_sbh); 401 s->s_dirt = 1; 402 } 403 dump_imap("read_super", s); 404 return 0; 405 406 out: 407 brelse(bh); 408 kfree(info); 409 s->s_fs_info = NULL; 410 return -EINVAL; 411 } 412 413 static int bfs_get_sb(struct file_system_type *fs_type, 414 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 415 { 416 return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt); 417 } 418 419 static struct file_system_type bfs_fs_type = { 420 .owner = THIS_MODULE, 421 .name = "bfs", 422 .get_sb = bfs_get_sb, 423 .kill_sb = kill_block_super, 424 .fs_flags = FS_REQUIRES_DEV, 425 }; 426 427 static int __init init_bfs_fs(void) 428 { 429 int err = init_inodecache(); 430 if (err) 431 goto out1; 432 err = register_filesystem(&bfs_fs_type); 433 if (err) 434 goto out; 435 return 0; 436 out: 437 destroy_inodecache(); 438 out1: 439 return err; 440 } 441 442 static void __exit exit_bfs_fs(void) 443 { 444 unregister_filesystem(&bfs_fs_type); 445 destroy_inodecache(); 446 } 447 448 module_init(init_bfs_fs) 449 module_exit(exit_bfs_fs) 450