1 /* 2 * linux/fs/hfsplus/super.c 3 * 4 * Copyright (C) 2001 5 * Brad Boyer (flar@allandria.com) 6 * (C) 2003 Ardis Technologies <roman@ardistech.com> 7 * 8 */ 9 10 #include <linux/config.h> 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/pagemap.h> 14 #include <linux/fs.h> 15 #include <linux/sched.h> 16 #include <linux/slab.h> 17 #include <linux/version.h> 18 #include <linux/vfs.h> 19 #include <linux/nls.h> 20 21 static struct inode *hfsplus_alloc_inode(struct super_block *sb); 22 static void hfsplus_destroy_inode(struct inode *inode); 23 24 #include "hfsplus_fs.h" 25 26 void hfsplus_inode_check(struct super_block *sb) 27 { 28 #if 0 29 u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt); 30 u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt; 31 32 if (cnt <= (last_cnt / 2) || 33 cnt >= (last_cnt * 2)) { 34 HFSPLUS_SB(sb).last_inode_cnt = cnt; 35 printk("inode_check: %u,%u,%u\n", cnt, last_cnt, 36 HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0); 37 } 38 #endif 39 } 40 41 static void hfsplus_read_inode(struct inode *inode) 42 { 43 struct hfs_find_data fd; 44 struct hfsplus_vh *vhdr; 45 int err; 46 47 atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt); 48 hfsplus_inode_check(inode->i_sb); 49 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 50 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 51 HFSPLUS_I(inode).flags = 0; 52 HFSPLUS_I(inode).rsrc_inode = NULL; 53 atomic_set(&HFSPLUS_I(inode).opencnt, 0); 54 55 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) { 56 read_inode: 57 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd); 58 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 59 if (!err) 60 err = hfsplus_cat_read_inode(inode, &fd); 61 hfs_find_exit(&fd); 62 if (err) 63 goto bad_inode; 64 return; 65 } 66 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr; 67 switch(inode->i_ino) { 68 case HFSPLUS_ROOT_CNID: 69 goto read_inode; 70 case HFSPLUS_EXT_CNID: 71 hfsplus_inode_read_fork(inode, &vhdr->ext_file); 72 inode->i_mapping->a_ops = &hfsplus_btree_aops; 73 break; 74 case HFSPLUS_CAT_CNID: 75 hfsplus_inode_read_fork(inode, &vhdr->cat_file); 76 inode->i_mapping->a_ops = &hfsplus_btree_aops; 77 break; 78 case HFSPLUS_ALLOC_CNID: 79 hfsplus_inode_read_fork(inode, &vhdr->alloc_file); 80 inode->i_mapping->a_ops = &hfsplus_aops; 81 break; 82 case HFSPLUS_START_CNID: 83 hfsplus_inode_read_fork(inode, &vhdr->start_file); 84 break; 85 case HFSPLUS_ATTR_CNID: 86 hfsplus_inode_read_fork(inode, &vhdr->attr_file); 87 inode->i_mapping->a_ops = &hfsplus_btree_aops; 88 break; 89 default: 90 goto bad_inode; 91 } 92 93 return; 94 95 bad_inode: 96 make_bad_inode(inode); 97 } 98 99 static int hfsplus_write_inode(struct inode *inode, int unused) 100 { 101 struct hfsplus_vh *vhdr; 102 int ret = 0; 103 104 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 105 hfsplus_ext_write_extent(inode); 106 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) { 107 return hfsplus_cat_write_inode(inode); 108 } 109 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr; 110 switch (inode->i_ino) { 111 case HFSPLUS_ROOT_CNID: 112 ret = hfsplus_cat_write_inode(inode); 113 break; 114 case HFSPLUS_EXT_CNID: 115 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) { 116 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 117 inode->i_sb->s_dirt = 1; 118 } 119 hfsplus_inode_write_fork(inode, &vhdr->ext_file); 120 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree); 121 break; 122 case HFSPLUS_CAT_CNID: 123 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) { 124 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 125 inode->i_sb->s_dirt = 1; 126 } 127 hfsplus_inode_write_fork(inode, &vhdr->cat_file); 128 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree); 129 break; 130 case HFSPLUS_ALLOC_CNID: 131 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) { 132 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 133 inode->i_sb->s_dirt = 1; 134 } 135 hfsplus_inode_write_fork(inode, &vhdr->alloc_file); 136 break; 137 case HFSPLUS_START_CNID: 138 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) { 139 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 140 inode->i_sb->s_dirt = 1; 141 } 142 hfsplus_inode_write_fork(inode, &vhdr->start_file); 143 break; 144 case HFSPLUS_ATTR_CNID: 145 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) { 146 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 147 inode->i_sb->s_dirt = 1; 148 } 149 hfsplus_inode_write_fork(inode, &vhdr->attr_file); 150 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree); 151 break; 152 } 153 return ret; 154 } 155 156 static void hfsplus_clear_inode(struct inode *inode) 157 { 158 dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino); 159 atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt); 160 if (HFSPLUS_IS_RSRC(inode)) { 161 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL; 162 iput(HFSPLUS_I(inode).rsrc_inode); 163 } 164 hfsplus_inode_check(inode->i_sb); 165 } 166 167 static void hfsplus_write_super(struct super_block *sb) 168 { 169 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; 170 171 dprint(DBG_SUPER, "hfsplus_write_super\n"); 172 sb->s_dirt = 0; 173 if (sb->s_flags & MS_RDONLY) 174 /* warn? */ 175 return; 176 177 vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks); 178 vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc); 179 vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid); 180 vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count); 181 vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count); 182 183 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); 184 if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) { 185 if (HFSPLUS_SB(sb).sect_count) { 186 struct buffer_head *bh; 187 u32 block, offset; 188 189 block = HFSPLUS_SB(sb).blockoffset; 190 block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9); 191 offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1); 192 printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset, 193 HFSPLUS_SB(sb).sect_count, block, offset); 194 bh = sb_bread(sb, block); 195 if (bh) { 196 vhdr = (struct hfsplus_vh *)(bh->b_data + offset); 197 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) { 198 memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr)); 199 mark_buffer_dirty(bh); 200 brelse(bh); 201 } else 202 printk("backup not found!\n"); 203 } 204 } 205 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP; 206 } 207 } 208 209 static void hfsplus_put_super(struct super_block *sb) 210 { 211 dprint(DBG_SUPER, "hfsplus_put_super\n"); 212 if (!sb->s_fs_info) 213 return; 214 if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) { 215 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; 216 217 vhdr->modify_date = hfsp_now2mt(); 218 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 219 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 220 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); 221 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh); 222 } 223 224 hfs_btree_close(HFSPLUS_SB(sb).cat_tree); 225 hfs_btree_close(HFSPLUS_SB(sb).ext_tree); 226 iput(HFSPLUS_SB(sb).alloc_file); 227 iput(HFSPLUS_SB(sb).hidden_dir); 228 brelse(HFSPLUS_SB(sb).s_vhbh); 229 if (HFSPLUS_SB(sb).nls) 230 unload_nls(HFSPLUS_SB(sb).nls); 231 kfree(sb->s_fs_info); 232 sb->s_fs_info = NULL; 233 } 234 235 static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf) 236 { 237 buf->f_type = HFSPLUS_SUPER_MAGIC; 238 buf->f_bsize = sb->s_blocksize; 239 buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift; 240 buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift; 241 buf->f_bavail = buf->f_bfree; 242 buf->f_files = 0xFFFFFFFF; 243 buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid; 244 buf->f_namelen = HFSPLUS_MAX_STRLEN; 245 246 return 0; 247 } 248 249 static int hfsplus_remount(struct super_block *sb, int *flags, char *data) 250 { 251 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 252 return 0; 253 if (!(*flags & MS_RDONLY)) { 254 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; 255 256 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 257 printk("HFS+-fs warning: Filesystem was not cleanly unmounted, " 258 "running fsck.hfsplus is recommended. leaving read-only.\n"); 259 sb->s_flags |= MS_RDONLY; 260 *flags |= MS_RDONLY; 261 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 262 printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n"); 263 sb->s_flags |= MS_RDONLY; 264 *flags |= MS_RDONLY; 265 } 266 } 267 return 0; 268 } 269 270 static struct super_operations hfsplus_sops = { 271 .alloc_inode = hfsplus_alloc_inode, 272 .destroy_inode = hfsplus_destroy_inode, 273 .read_inode = hfsplus_read_inode, 274 .write_inode = hfsplus_write_inode, 275 .clear_inode = hfsplus_clear_inode, 276 .put_super = hfsplus_put_super, 277 .write_super = hfsplus_write_super, 278 .statfs = hfsplus_statfs, 279 .remount_fs = hfsplus_remount, 280 .show_options = hfsplus_show_options, 281 }; 282 283 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) 284 { 285 struct hfsplus_vh *vhdr; 286 struct hfsplus_sb_info *sbi; 287 hfsplus_cat_entry entry; 288 struct hfs_find_data fd; 289 struct inode *root; 290 struct qstr str; 291 struct nls_table *nls = NULL; 292 int err = -EINVAL; 293 294 sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL); 295 if (!sbi) 296 return -ENOMEM; 297 298 memset(sbi, 0, sizeof(HFSPLUS_SB(sb))); 299 sb->s_fs_info = sbi; 300 INIT_HLIST_HEAD(&sbi->rsrc_inodes); 301 hfsplus_fill_defaults(sbi); 302 if (!hfsplus_parse_options(data, sbi)) { 303 if (!silent) 304 printk("HFS+-fs: unable to parse mount options\n"); 305 err = -EINVAL; 306 goto cleanup; 307 } 308 309 /* temporarily use utf8 to correctly find the hidden dir below */ 310 nls = sbi->nls; 311 sbi->nls = load_nls("utf8"); 312 if (!nls) { 313 printk("HFS+: unable to load nls for utf8\n"); 314 err = -EINVAL; 315 goto cleanup; 316 } 317 318 /* Grab the volume header */ 319 if (hfsplus_read_wrapper(sb)) { 320 if (!silent) 321 printk("HFS+-fs: unable to find HFS+ superblock\n"); 322 err = -EINVAL; 323 goto cleanup; 324 } 325 vhdr = HFSPLUS_SB(sb).s_vhdr; 326 327 /* Copy parts of the volume header into the superblock */ 328 sb->s_magic = be16_to_cpu(vhdr->signature); 329 if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) { 330 if (!silent) 331 printk("HFS+-fs: wrong filesystem version\n"); 332 goto cleanup; 333 } 334 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks); 335 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks); 336 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc); 337 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid); 338 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count); 339 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count); 340 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift; 341 if (!HFSPLUS_SB(sb).data_clump_blocks) 342 HFSPLUS_SB(sb).data_clump_blocks = 1; 343 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift; 344 if (!HFSPLUS_SB(sb).rsrc_clump_blocks) 345 HFSPLUS_SB(sb).rsrc_clump_blocks = 1; 346 347 /* Set up operations so we can load metadata */ 348 sb->s_op = &hfsplus_sops; 349 sb->s_maxbytes = MAX_LFS_FILESIZE; 350 351 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 352 if (!silent) 353 printk("HFS+-fs warning: Filesystem was not cleanly unmounted, " 354 "running fsck.hfsplus is recommended. mounting read-only.\n"); 355 sb->s_flags |= MS_RDONLY; 356 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 357 if (!silent) 358 printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n"); 359 sb->s_flags |= MS_RDONLY; 360 } 361 362 /* Load metadata objects (B*Trees) */ 363 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 364 if (!HFSPLUS_SB(sb).ext_tree) { 365 if (!silent) 366 printk("HFS+-fs: failed to load extents file\n"); 367 goto cleanup; 368 } 369 HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); 370 if (!HFSPLUS_SB(sb).cat_tree) { 371 if (!silent) 372 printk("HFS+-fs: failed to load catalog file\n"); 373 goto cleanup; 374 } 375 376 HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID); 377 if (!HFSPLUS_SB(sb).alloc_file) { 378 if (!silent) 379 printk("HFS+-fs: failed to load allocation file\n"); 380 goto cleanup; 381 } 382 383 /* Load the root directory */ 384 root = iget(sb, HFSPLUS_ROOT_CNID); 385 sb->s_root = d_alloc_root(root); 386 if (!sb->s_root) { 387 if (!silent) 388 printk("HFS+-fs: failed to load root directory\n"); 389 iput(root); 390 goto cleanup; 391 } 392 393 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 394 str.name = HFSP_HIDDENDIR_NAME; 395 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); 396 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 397 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 398 hfs_find_exit(&fd); 399 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) 400 goto cleanup; 401 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id)); 402 if (!HFSPLUS_SB(sb).hidden_dir) 403 goto cleanup; 404 } else 405 hfs_find_exit(&fd); 406 407 if (sb->s_flags & MS_RDONLY) 408 goto out; 409 410 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 411 * all three are registered with Apple for our use 412 */ 413 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 414 vhdr->modify_date = hfsp_now2mt(); 415 vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1); 416 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 417 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 418 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); 419 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh); 420 421 if (!HFSPLUS_SB(sb).hidden_dir) { 422 printk("HFS+: create hidden dir...\n"); 423 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR); 424 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode, 425 &str, HFSPLUS_SB(sb).hidden_dir); 426 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir); 427 } 428 out: 429 unload_nls(sbi->nls); 430 sbi->nls = nls; 431 return 0; 432 433 cleanup: 434 hfsplus_put_super(sb); 435 if (nls) 436 unload_nls(nls); 437 return err; 438 } 439 440 MODULE_AUTHOR("Brad Boyer"); 441 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 442 MODULE_LICENSE("GPL"); 443 444 static kmem_cache_t *hfsplus_inode_cachep; 445 446 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 447 { 448 struct hfsplus_inode_info *i; 449 450 i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL); 451 return i ? &i->vfs_inode : NULL; 452 } 453 454 static void hfsplus_destroy_inode(struct inode *inode) 455 { 456 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode)); 457 } 458 459 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 460 461 static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type, 462 int flags, const char *dev_name, void *data) 463 { 464 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); 465 } 466 467 static struct file_system_type hfsplus_fs_type = { 468 .owner = THIS_MODULE, 469 .name = "hfsplus", 470 .get_sb = hfsplus_get_sb, 471 .kill_sb = kill_block_super, 472 .fs_flags = FS_REQUIRES_DEV, 473 }; 474 475 static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags) 476 { 477 struct hfsplus_inode_info *i = p; 478 479 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) 480 inode_init_once(&i->vfs_inode); 481 } 482 483 static int __init init_hfsplus_fs(void) 484 { 485 int err; 486 487 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 488 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN, 489 hfsplus_init_once, NULL); 490 if (!hfsplus_inode_cachep) 491 return -ENOMEM; 492 err = register_filesystem(&hfsplus_fs_type); 493 if (err) 494 kmem_cache_destroy(hfsplus_inode_cachep); 495 return err; 496 } 497 498 static void __exit exit_hfsplus_fs(void) 499 { 500 unregister_filesystem(&hfsplus_fs_type); 501 if (kmem_cache_destroy(hfsplus_inode_cachep)) 502 printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n"); 503 } 504 505 module_init(init_hfsplus_fs) 506 module_exit(exit_hfsplus_fs) 507