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/module.h> 11 #include <linux/init.h> 12 #include <linux/pagemap.h> 13 #include <linux/fs.h> 14 #include <linux/slab.h> 15 #include <linux/vfs.h> 16 #include <linux/nls.h> 17 18 static struct inode *hfsplus_alloc_inode(struct super_block *sb); 19 static void hfsplus_destroy_inode(struct inode *inode); 20 21 #include "hfsplus_fs.h" 22 23 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) 24 { 25 struct hfs_find_data fd; 26 struct hfsplus_vh *vhdr; 27 struct inode *inode; 28 long err = -EIO; 29 30 inode = iget_locked(sb, ino); 31 if (!inode) 32 return ERR_PTR(-ENOMEM); 33 if (!(inode->i_state & I_NEW)) 34 return inode; 35 36 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 37 mutex_init(&HFSPLUS_I(inode).extents_lock); 38 HFSPLUS_I(inode).flags = 0; 39 HFSPLUS_I(inode).rsrc_inode = NULL; 40 atomic_set(&HFSPLUS_I(inode).opencnt, 0); 41 42 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) { 43 read_inode: 44 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd); 45 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 46 if (!err) 47 err = hfsplus_cat_read_inode(inode, &fd); 48 hfs_find_exit(&fd); 49 if (err) 50 goto bad_inode; 51 goto done; 52 } 53 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr; 54 switch(inode->i_ino) { 55 case HFSPLUS_ROOT_CNID: 56 goto read_inode; 57 case HFSPLUS_EXT_CNID: 58 hfsplus_inode_read_fork(inode, &vhdr->ext_file); 59 inode->i_mapping->a_ops = &hfsplus_btree_aops; 60 break; 61 case HFSPLUS_CAT_CNID: 62 hfsplus_inode_read_fork(inode, &vhdr->cat_file); 63 inode->i_mapping->a_ops = &hfsplus_btree_aops; 64 break; 65 case HFSPLUS_ALLOC_CNID: 66 hfsplus_inode_read_fork(inode, &vhdr->alloc_file); 67 inode->i_mapping->a_ops = &hfsplus_aops; 68 break; 69 case HFSPLUS_START_CNID: 70 hfsplus_inode_read_fork(inode, &vhdr->start_file); 71 break; 72 case HFSPLUS_ATTR_CNID: 73 hfsplus_inode_read_fork(inode, &vhdr->attr_file); 74 inode->i_mapping->a_ops = &hfsplus_btree_aops; 75 break; 76 default: 77 goto bad_inode; 78 } 79 80 done: 81 unlock_new_inode(inode); 82 return inode; 83 84 bad_inode: 85 iget_failed(inode); 86 return ERR_PTR(err); 87 } 88 89 static int hfsplus_write_inode(struct inode *inode, int unused) 90 { 91 struct hfsplus_vh *vhdr; 92 int ret = 0; 93 94 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 95 hfsplus_ext_write_extent(inode); 96 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) { 97 return hfsplus_cat_write_inode(inode); 98 } 99 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr; 100 switch (inode->i_ino) { 101 case HFSPLUS_ROOT_CNID: 102 ret = hfsplus_cat_write_inode(inode); 103 break; 104 case HFSPLUS_EXT_CNID: 105 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) { 106 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 107 inode->i_sb->s_dirt = 1; 108 } 109 hfsplus_inode_write_fork(inode, &vhdr->ext_file); 110 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree); 111 break; 112 case HFSPLUS_CAT_CNID: 113 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) { 114 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 115 inode->i_sb->s_dirt = 1; 116 } 117 hfsplus_inode_write_fork(inode, &vhdr->cat_file); 118 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree); 119 break; 120 case HFSPLUS_ALLOC_CNID: 121 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) { 122 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 123 inode->i_sb->s_dirt = 1; 124 } 125 hfsplus_inode_write_fork(inode, &vhdr->alloc_file); 126 break; 127 case HFSPLUS_START_CNID: 128 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) { 129 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 130 inode->i_sb->s_dirt = 1; 131 } 132 hfsplus_inode_write_fork(inode, &vhdr->start_file); 133 break; 134 case HFSPLUS_ATTR_CNID: 135 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) { 136 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 137 inode->i_sb->s_dirt = 1; 138 } 139 hfsplus_inode_write_fork(inode, &vhdr->attr_file); 140 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree); 141 break; 142 } 143 return ret; 144 } 145 146 static void hfsplus_clear_inode(struct inode *inode) 147 { 148 dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino); 149 if (HFSPLUS_IS_RSRC(inode)) { 150 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL; 151 iput(HFSPLUS_I(inode).rsrc_inode); 152 } 153 } 154 155 static void hfsplus_write_super(struct super_block *sb) 156 { 157 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; 158 159 dprint(DBG_SUPER, "hfsplus_write_super\n"); 160 sb->s_dirt = 0; 161 if (sb->s_flags & MS_RDONLY) 162 /* warn? */ 163 return; 164 165 vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks); 166 vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc); 167 vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid); 168 vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count); 169 vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count); 170 171 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); 172 if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) { 173 if (HFSPLUS_SB(sb).sect_count) { 174 struct buffer_head *bh; 175 u32 block, offset; 176 177 block = HFSPLUS_SB(sb).blockoffset; 178 block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9); 179 offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1); 180 printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset, 181 HFSPLUS_SB(sb).sect_count, block, offset); 182 bh = sb_bread(sb, block); 183 if (bh) { 184 vhdr = (struct hfsplus_vh *)(bh->b_data + offset); 185 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) { 186 memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr)); 187 mark_buffer_dirty(bh); 188 brelse(bh); 189 } else 190 printk(KERN_WARNING "hfs: backup not found!\n"); 191 } 192 } 193 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP; 194 } 195 } 196 197 static void hfsplus_put_super(struct super_block *sb) 198 { 199 dprint(DBG_SUPER, "hfsplus_put_super\n"); 200 if (!sb->s_fs_info) 201 return; 202 if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) { 203 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; 204 205 vhdr->modify_date = hfsp_now2mt(); 206 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 207 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 208 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); 209 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh); 210 } 211 212 hfs_btree_close(HFSPLUS_SB(sb).cat_tree); 213 hfs_btree_close(HFSPLUS_SB(sb).ext_tree); 214 iput(HFSPLUS_SB(sb).alloc_file); 215 iput(HFSPLUS_SB(sb).hidden_dir); 216 brelse(HFSPLUS_SB(sb).s_vhbh); 217 if (HFSPLUS_SB(sb).nls) 218 unload_nls(HFSPLUS_SB(sb).nls); 219 kfree(sb->s_fs_info); 220 sb->s_fs_info = NULL; 221 } 222 223 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 224 { 225 struct super_block *sb = dentry->d_sb; 226 227 buf->f_type = HFSPLUS_SUPER_MAGIC; 228 buf->f_bsize = sb->s_blocksize; 229 buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift; 230 buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift; 231 buf->f_bavail = buf->f_bfree; 232 buf->f_files = 0xFFFFFFFF; 233 buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid; 234 buf->f_namelen = HFSPLUS_MAX_STRLEN; 235 236 return 0; 237 } 238 239 static int hfsplus_remount(struct super_block *sb, int *flags, char *data) 240 { 241 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 242 return 0; 243 if (!(*flags & MS_RDONLY)) { 244 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; 245 struct hfsplus_sb_info sbi; 246 247 memset(&sbi, 0, sizeof(struct hfsplus_sb_info)); 248 sbi.nls = HFSPLUS_SB(sb).nls; 249 if (!hfsplus_parse_options(data, &sbi)) 250 return -EINVAL; 251 252 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 253 printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, " 254 "running fsck.hfsplus is recommended. leaving read-only.\n"); 255 sb->s_flags |= MS_RDONLY; 256 *flags |= MS_RDONLY; 257 } else if (sbi.flags & HFSPLUS_SB_FORCE) { 258 /* nothing */ 259 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 260 printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n"); 261 sb->s_flags |= MS_RDONLY; 262 *flags |= MS_RDONLY; 263 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 264 printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n"); 265 sb->s_flags |= MS_RDONLY; 266 *flags |= MS_RDONLY; 267 } 268 } 269 return 0; 270 } 271 272 static const struct super_operations hfsplus_sops = { 273 .alloc_inode = hfsplus_alloc_inode, 274 .destroy_inode = hfsplus_destroy_inode, 275 .write_inode = hfsplus_write_inode, 276 .clear_inode = hfsplus_clear_inode, 277 .put_super = hfsplus_put_super, 278 .write_super = hfsplus_write_super, 279 .statfs = hfsplus_statfs, 280 .remount_fs = hfsplus_remount, 281 .show_options = hfsplus_show_options, 282 }; 283 284 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) 285 { 286 struct hfsplus_vh *vhdr; 287 struct hfsplus_sb_info *sbi; 288 hfsplus_cat_entry entry; 289 struct hfs_find_data fd; 290 struct inode *root, *inode; 291 struct qstr str; 292 struct nls_table *nls = NULL; 293 int err = -EINVAL; 294 295 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 296 if (!sbi) 297 return -ENOMEM; 298 299 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 printk(KERN_ERR "hfs: unable to parse mount options\n"); 304 err = -EINVAL; 305 goto cleanup; 306 } 307 308 /* temporarily use utf8 to correctly find the hidden dir below */ 309 nls = sbi->nls; 310 sbi->nls = load_nls("utf8"); 311 if (!sbi->nls) { 312 printk(KERN_ERR "hfs: unable to load nls for utf8\n"); 313 err = -EINVAL; 314 goto cleanup; 315 } 316 317 /* Grab the volume header */ 318 if (hfsplus_read_wrapper(sb)) { 319 if (!silent) 320 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n"); 321 err = -EINVAL; 322 goto cleanup; 323 } 324 vhdr = HFSPLUS_SB(sb).s_vhdr; 325 326 /* Copy parts of the volume header into the superblock */ 327 sb->s_magic = HFSPLUS_VOLHEAD_SIG; 328 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 329 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 330 printk(KERN_ERR "hfs: wrong filesystem version\n"); 331 goto cleanup; 332 } 333 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks); 334 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks); 335 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc); 336 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid); 337 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count); 338 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count); 339 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift; 340 if (!HFSPLUS_SB(sb).data_clump_blocks) 341 HFSPLUS_SB(sb).data_clump_blocks = 1; 342 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift; 343 if (!HFSPLUS_SB(sb).rsrc_clump_blocks) 344 HFSPLUS_SB(sb).rsrc_clump_blocks = 1; 345 346 /* Set up operations so we can load metadata */ 347 sb->s_op = &hfsplus_sops; 348 sb->s_maxbytes = MAX_LFS_FILESIZE; 349 350 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 351 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, " 352 "running fsck.hfsplus is recommended. mounting read-only.\n"); 353 sb->s_flags |= MS_RDONLY; 354 } else if (sbi->flags & HFSPLUS_SB_FORCE) { 355 /* nothing */ 356 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 357 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n"); 358 sb->s_flags |= MS_RDONLY; 359 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) { 360 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, " 361 "use the force option at your own risk, mounting read-only.\n"); 362 sb->s_flags |= MS_RDONLY; 363 } 364 sbi->flags &= ~HFSPLUS_SB_FORCE; 365 366 /* Load metadata objects (B*Trees) */ 367 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 368 if (!HFSPLUS_SB(sb).ext_tree) { 369 printk(KERN_ERR "hfs: failed to load extents file\n"); 370 goto cleanup; 371 } 372 HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); 373 if (!HFSPLUS_SB(sb).cat_tree) { 374 printk(KERN_ERR "hfs: failed to load catalog file\n"); 375 goto cleanup; 376 } 377 378 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); 379 if (IS_ERR(inode)) { 380 printk(KERN_ERR "hfs: failed to load allocation file\n"); 381 err = PTR_ERR(inode); 382 goto cleanup; 383 } 384 HFSPLUS_SB(sb).alloc_file = inode; 385 386 /* Load the root directory */ 387 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); 388 if (IS_ERR(root)) { 389 printk(KERN_ERR "hfs: failed to load root directory\n"); 390 err = PTR_ERR(root); 391 goto cleanup; 392 } 393 sb->s_root = d_alloc_root(root); 394 if (!sb->s_root) { 395 iput(root); 396 err = -ENOMEM; 397 goto cleanup; 398 } 399 sb->s_root->d_op = &hfsplus_dentry_operations; 400 401 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 402 str.name = HFSP_HIDDENDIR_NAME; 403 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); 404 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 405 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 406 hfs_find_exit(&fd); 407 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) 408 goto cleanup; 409 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 410 if (IS_ERR(inode)) { 411 err = PTR_ERR(inode); 412 goto cleanup; 413 } 414 HFSPLUS_SB(sb).hidden_dir = inode; 415 } else 416 hfs_find_exit(&fd); 417 418 if (sb->s_flags & MS_RDONLY) 419 goto out; 420 421 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 422 * all three are registered with Apple for our use 423 */ 424 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 425 vhdr->modify_date = hfsp_now2mt(); 426 be32_add_cpu(&vhdr->write_count, 1); 427 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 428 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 429 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); 430 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh); 431 432 if (!HFSPLUS_SB(sb).hidden_dir) { 433 printk(KERN_DEBUG "hfs: create hidden dir...\n"); 434 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR); 435 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode, 436 &str, HFSPLUS_SB(sb).hidden_dir); 437 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir); 438 } 439 out: 440 unload_nls(sbi->nls); 441 sbi->nls = nls; 442 return 0; 443 444 cleanup: 445 hfsplus_put_super(sb); 446 if (nls) 447 unload_nls(nls); 448 return err; 449 } 450 451 MODULE_AUTHOR("Brad Boyer"); 452 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 453 MODULE_LICENSE("GPL"); 454 455 static struct kmem_cache *hfsplus_inode_cachep; 456 457 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 458 { 459 struct hfsplus_inode_info *i; 460 461 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL); 462 return i ? &i->vfs_inode : NULL; 463 } 464 465 static void hfsplus_destroy_inode(struct inode *inode) 466 { 467 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode)); 468 } 469 470 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 471 472 static int hfsplus_get_sb(struct file_system_type *fs_type, 473 int flags, const char *dev_name, void *data, 474 struct vfsmount *mnt) 475 { 476 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super, 477 mnt); 478 } 479 480 static struct file_system_type hfsplus_fs_type = { 481 .owner = THIS_MODULE, 482 .name = "hfsplus", 483 .get_sb = hfsplus_get_sb, 484 .kill_sb = kill_block_super, 485 .fs_flags = FS_REQUIRES_DEV, 486 }; 487 488 static void hfsplus_init_once(void *p) 489 { 490 struct hfsplus_inode_info *i = p; 491 492 inode_init_once(&i->vfs_inode); 493 } 494 495 static int __init init_hfsplus_fs(void) 496 { 497 int err; 498 499 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 500 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN, 501 hfsplus_init_once); 502 if (!hfsplus_inode_cachep) 503 return -ENOMEM; 504 err = register_filesystem(&hfsplus_fs_type); 505 if (err) 506 kmem_cache_destroy(hfsplus_inode_cachep); 507 return err; 508 } 509 510 static void __exit exit_hfsplus_fs(void) 511 { 512 unregister_filesystem(&hfsplus_fs_type); 513 kmem_cache_destroy(hfsplus_inode_cachep); 514 } 515 516 module_init(init_hfsplus_fs) 517 module_exit(exit_hfsplus_fs) 518