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/vfs.h> 18 #include <linux/nls.h> 19 20 static struct inode *hfsplus_alloc_inode(struct super_block *sb); 21 static void hfsplus_destroy_inode(struct inode *inode); 22 23 #include "hfsplus_fs.h" 24 25 static void hfsplus_read_inode(struct inode *inode) 26 { 27 struct hfs_find_data fd; 28 struct hfsplus_vh *vhdr; 29 int err; 30 31 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 32 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 33 HFSPLUS_I(inode).flags = 0; 34 HFSPLUS_I(inode).rsrc_inode = NULL; 35 atomic_set(&HFSPLUS_I(inode).opencnt, 0); 36 37 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) { 38 read_inode: 39 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd); 40 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 41 if (!err) 42 err = hfsplus_cat_read_inode(inode, &fd); 43 hfs_find_exit(&fd); 44 if (err) 45 goto bad_inode; 46 return; 47 } 48 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr; 49 switch(inode->i_ino) { 50 case HFSPLUS_ROOT_CNID: 51 goto read_inode; 52 case HFSPLUS_EXT_CNID: 53 hfsplus_inode_read_fork(inode, &vhdr->ext_file); 54 inode->i_mapping->a_ops = &hfsplus_btree_aops; 55 break; 56 case HFSPLUS_CAT_CNID: 57 hfsplus_inode_read_fork(inode, &vhdr->cat_file); 58 inode->i_mapping->a_ops = &hfsplus_btree_aops; 59 break; 60 case HFSPLUS_ALLOC_CNID: 61 hfsplus_inode_read_fork(inode, &vhdr->alloc_file); 62 inode->i_mapping->a_ops = &hfsplus_aops; 63 break; 64 case HFSPLUS_START_CNID: 65 hfsplus_inode_read_fork(inode, &vhdr->start_file); 66 break; 67 case HFSPLUS_ATTR_CNID: 68 hfsplus_inode_read_fork(inode, &vhdr->attr_file); 69 inode->i_mapping->a_ops = &hfsplus_btree_aops; 70 break; 71 default: 72 goto bad_inode; 73 } 74 75 return; 76 77 bad_inode: 78 make_bad_inode(inode); 79 } 80 81 static int hfsplus_write_inode(struct inode *inode, int unused) 82 { 83 struct hfsplus_vh *vhdr; 84 int ret = 0; 85 86 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 87 hfsplus_ext_write_extent(inode); 88 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) { 89 return hfsplus_cat_write_inode(inode); 90 } 91 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr; 92 switch (inode->i_ino) { 93 case HFSPLUS_ROOT_CNID: 94 ret = hfsplus_cat_write_inode(inode); 95 break; 96 case HFSPLUS_EXT_CNID: 97 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) { 98 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 99 inode->i_sb->s_dirt = 1; 100 } 101 hfsplus_inode_write_fork(inode, &vhdr->ext_file); 102 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree); 103 break; 104 case HFSPLUS_CAT_CNID: 105 if (vhdr->cat_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->cat_file); 110 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree); 111 break; 112 case HFSPLUS_ALLOC_CNID: 113 if (vhdr->alloc_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->alloc_file); 118 break; 119 case HFSPLUS_START_CNID: 120 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) { 121 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 122 inode->i_sb->s_dirt = 1; 123 } 124 hfsplus_inode_write_fork(inode, &vhdr->start_file); 125 break; 126 case HFSPLUS_ATTR_CNID: 127 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) { 128 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP; 129 inode->i_sb->s_dirt = 1; 130 } 131 hfsplus_inode_write_fork(inode, &vhdr->attr_file); 132 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree); 133 break; 134 } 135 return ret; 136 } 137 138 static void hfsplus_clear_inode(struct inode *inode) 139 { 140 dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino); 141 if (HFSPLUS_IS_RSRC(inode)) { 142 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL; 143 iput(HFSPLUS_I(inode).rsrc_inode); 144 } 145 } 146 147 static void hfsplus_write_super(struct super_block *sb) 148 { 149 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; 150 151 dprint(DBG_SUPER, "hfsplus_write_super\n"); 152 sb->s_dirt = 0; 153 if (sb->s_flags & MS_RDONLY) 154 /* warn? */ 155 return; 156 157 vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks); 158 vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc); 159 vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid); 160 vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count); 161 vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count); 162 163 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); 164 if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) { 165 if (HFSPLUS_SB(sb).sect_count) { 166 struct buffer_head *bh; 167 u32 block, offset; 168 169 block = HFSPLUS_SB(sb).blockoffset; 170 block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9); 171 offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1); 172 printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset, 173 HFSPLUS_SB(sb).sect_count, block, offset); 174 bh = sb_bread(sb, block); 175 if (bh) { 176 vhdr = (struct hfsplus_vh *)(bh->b_data + offset); 177 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) { 178 memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr)); 179 mark_buffer_dirty(bh); 180 brelse(bh); 181 } else 182 printk(KERN_WARNING "hfs: backup not found!\n"); 183 } 184 } 185 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP; 186 } 187 } 188 189 static void hfsplus_put_super(struct super_block *sb) 190 { 191 dprint(DBG_SUPER, "hfsplus_put_super\n"); 192 if (!sb->s_fs_info) 193 return; 194 if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) { 195 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr; 196 197 vhdr->modify_date = hfsp_now2mt(); 198 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 199 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 200 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); 201 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh); 202 } 203 204 hfs_btree_close(HFSPLUS_SB(sb).cat_tree); 205 hfs_btree_close(HFSPLUS_SB(sb).ext_tree); 206 iput(HFSPLUS_SB(sb).alloc_file); 207 iput(HFSPLUS_SB(sb).hidden_dir); 208 brelse(HFSPLUS_SB(sb).s_vhbh); 209 if (HFSPLUS_SB(sb).nls) 210 unload_nls(HFSPLUS_SB(sb).nls); 211 kfree(sb->s_fs_info); 212 sb->s_fs_info = NULL; 213 } 214 215 static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf) 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 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 = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL); 287 if (!sbi) 288 return -ENOMEM; 289 290 memset(sbi, 0, sizeof(HFSPLUS_SB(sb))); 291 sb->s_fs_info = sbi; 292 INIT_HLIST_HEAD(&sbi->rsrc_inodes); 293 hfsplus_fill_defaults(sbi); 294 if (!hfsplus_parse_options(data, sbi)) { 295 printk(KERN_ERR "hfs: unable to parse mount options\n"); 296 err = -EINVAL; 297 goto cleanup; 298 } 299 300 /* temporarily use utf8 to correctly find the hidden dir below */ 301 nls = sbi->nls; 302 sbi->nls = load_nls("utf8"); 303 if (!sbi->nls) { 304 printk(KERN_ERR "hfs: unable to load nls for utf8\n"); 305 err = -EINVAL; 306 goto cleanup; 307 } 308 309 /* Grab the volume header */ 310 if (hfsplus_read_wrapper(sb)) { 311 if (!silent) 312 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n"); 313 err = -EINVAL; 314 goto cleanup; 315 } 316 vhdr = HFSPLUS_SB(sb).s_vhdr; 317 318 /* Copy parts of the volume header into the superblock */ 319 sb->s_magic = be16_to_cpu(vhdr->signature); 320 if (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 } 383 384 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 385 str.name = HFSP_HIDDENDIR_NAME; 386 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); 387 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 388 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 389 hfs_find_exit(&fd); 390 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) 391 goto cleanup; 392 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id)); 393 if (!HFSPLUS_SB(sb).hidden_dir) 394 goto cleanup; 395 } else 396 hfs_find_exit(&fd); 397 398 if (sb->s_flags & MS_RDONLY) 399 goto out; 400 401 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 402 * all three are registered with Apple for our use 403 */ 404 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 405 vhdr->modify_date = hfsp_now2mt(); 406 vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1); 407 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 408 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 409 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); 410 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh); 411 412 if (!HFSPLUS_SB(sb).hidden_dir) { 413 printk(KERN_DEBUG "hfs: create hidden dir...\n"); 414 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR); 415 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode, 416 &str, HFSPLUS_SB(sb).hidden_dir); 417 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir); 418 } 419 out: 420 unload_nls(sbi->nls); 421 sbi->nls = nls; 422 return 0; 423 424 cleanup: 425 hfsplus_put_super(sb); 426 if (nls) 427 unload_nls(nls); 428 return err; 429 } 430 431 MODULE_AUTHOR("Brad Boyer"); 432 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 433 MODULE_LICENSE("GPL"); 434 435 static kmem_cache_t *hfsplus_inode_cachep; 436 437 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 438 { 439 struct hfsplus_inode_info *i; 440 441 i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL); 442 return i ? &i->vfs_inode : NULL; 443 } 444 445 static void hfsplus_destroy_inode(struct inode *inode) 446 { 447 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode)); 448 } 449 450 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 451 452 static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type, 453 int flags, const char *dev_name, void *data) 454 { 455 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); 456 } 457 458 static struct file_system_type hfsplus_fs_type = { 459 .owner = THIS_MODULE, 460 .name = "hfsplus", 461 .get_sb = hfsplus_get_sb, 462 .kill_sb = kill_block_super, 463 .fs_flags = FS_REQUIRES_DEV, 464 }; 465 466 static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags) 467 { 468 struct hfsplus_inode_info *i = p; 469 470 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR) 471 inode_init_once(&i->vfs_inode); 472 } 473 474 static int __init init_hfsplus_fs(void) 475 { 476 int err; 477 478 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 479 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN, 480 hfsplus_init_once, NULL); 481 if (!hfsplus_inode_cachep) 482 return -ENOMEM; 483 err = register_filesystem(&hfsplus_fs_type); 484 if (err) 485 kmem_cache_destroy(hfsplus_inode_cachep); 486 return err; 487 } 488 489 static void __exit exit_hfsplus_fs(void) 490 { 491 unregister_filesystem(&hfsplus_fs_type); 492 if (kmem_cache_destroy(hfsplus_inode_cachep)) 493 printk(KERN_ERR "hfsplus_inode_cache: not all structures were freed\n"); 494 } 495 496 module_init(init_hfsplus_fs) 497 module_exit(exit_hfsplus_fs) 498