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