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 18static struct inode *hfsplus_alloc_inode(struct super_block *sb); 19static void hfsplus_destroy_inode(struct inode *inode); 20 21#include "hfsplus_fs.h" 22 23static 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 79static 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 136static 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 145static 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 187static 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 213static 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 229static 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 262static 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 275static 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 = HFSPLUS_VOLHEAD_SIG; 320 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 321 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 322 printk(KERN_ERR "hfs: wrong filesystem version\n"); 323 goto cleanup; 324 } 325 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks); 326 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks); 327 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc); 328 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid); 329 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count); 330 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count); 331 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift; 332 if (!HFSPLUS_SB(sb).data_clump_blocks) 333 HFSPLUS_SB(sb).data_clump_blocks = 1; 334 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift; 335 if (!HFSPLUS_SB(sb).rsrc_clump_blocks) 336 HFSPLUS_SB(sb).rsrc_clump_blocks = 1; 337 338 /* Set up operations so we can load metadata */ 339 sb->s_op = &hfsplus_sops; 340 sb->s_maxbytes = MAX_LFS_FILESIZE; 341 342 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 343 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, " 344 "running fsck.hfsplus is recommended. mounting read-only.\n"); 345 /* Foxconn removed start pling 05/31/2010 */ 346 /* Ignore this flag to force writeable */ 347#if 0 348 sb->s_flags |= MS_RDONLY; 349#endif 350 /* Foxconn removed end pling 05/31/2010 */ 351 } else if (sbi->flags & HFSPLUS_SB_FORCE) { 352 /* nothing */ 353 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 354 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n"); 355 sb->s_flags |= MS_RDONLY; 356 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 357 printk(KERN_WARNING "hfs: write access to a jounaled filesystem is not supported, " 358 "use the force option at your own risk, mounting read-only.\n"); 359 sb->s_flags |= MS_RDONLY; 360 } 361 sbi->flags &= ~HFSPLUS_SB_FORCE; 362 363 /* Load metadata objects (B*Trees) */ 364 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 365 if (!HFSPLUS_SB(sb).ext_tree) { 366 printk(KERN_ERR "hfs: 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 printk(KERN_ERR "hfs: failed to load catalog file\n"); 372 goto cleanup; 373 } 374 375 HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID); 376 if (!HFSPLUS_SB(sb).alloc_file) { 377 printk(KERN_ERR "hfs: failed to load allocation file\n"); 378 goto cleanup; 379 } 380 381 /* Load the root directory */ 382 root = iget(sb, HFSPLUS_ROOT_CNID); 383 sb->s_root = d_alloc_root(root); 384 if (!sb->s_root) { 385 printk(KERN_ERR "hfs: failed to load root directory\n"); 386 iput(root); 387 goto cleanup; 388 } 389 390 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 391 str.name = HFSP_HIDDENDIR_NAME; 392 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); 393 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 394 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 395 hfs_find_exit(&fd); 396 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) 397 goto cleanup; 398 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id)); 399 if (!HFSPLUS_SB(sb).hidden_dir) 400 goto cleanup; 401 } else 402 hfs_find_exit(&fd); 403 404 if (sb->s_flags & MS_RDONLY) 405 goto out; 406 407 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 408 * all three are registered with Apple for our use 409 */ 410 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 411 vhdr->modify_date = hfsp_now2mt(); 412 vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1); 413 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 414 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 415 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh); 416 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh); 417 418 if (!HFSPLUS_SB(sb).hidden_dir) { 419 printk(KERN_DEBUG "hfs: create hidden dir...\n"); 420 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR); 421 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode, 422 &str, HFSPLUS_SB(sb).hidden_dir); 423 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir); 424 } 425out: 426 unload_nls(sbi->nls); 427 sbi->nls = nls; 428 return 0; 429 430cleanup: 431 hfsplus_put_super(sb); 432 if (nls) 433 unload_nls(nls); 434 return err; 435} 436 437MODULE_AUTHOR("Brad Boyer"); 438MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 439MODULE_LICENSE("GPL"); 440 441static struct kmem_cache *hfsplus_inode_cachep; 442 443static struct inode *hfsplus_alloc_inode(struct super_block *sb) 444{ 445 struct hfsplus_inode_info *i; 446 447 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL); 448 return i ? &i->vfs_inode : NULL; 449} 450 451static void hfsplus_destroy_inode(struct inode *inode) 452{ 453 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode)); 454} 455 456#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 457 458static int hfsplus_get_sb(struct file_system_type *fs_type, 459 int flags, const char *dev_name, void *data, 460 struct vfsmount *mnt) 461{ 462 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super, 463 mnt); 464} 465 466static struct file_system_type hfsplus_fs_type = { 467 .owner = THIS_MODULE, 468 .name = "hfsplus", 469 .get_sb = hfsplus_get_sb, 470 .kill_sb = kill_block_super, 471 .fs_flags = FS_REQUIRES_DEV, 472}; 473 474static void hfsplus_init_once(void *p, struct kmem_cache *cachep, unsigned long flags) 475{ 476 struct hfsplus_inode_info *i = p; 477 478 inode_init_once(&i->vfs_inode); 479} 480 481static int __init init_hfsplus_fs(void) 482{ 483 int err; 484 485 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 486 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN, 487 hfsplus_init_once, NULL); 488 if (!hfsplus_inode_cachep) 489 return -ENOMEM; 490 err = register_filesystem(&hfsplus_fs_type); 491 if (err) 492 kmem_cache_destroy(hfsplus_inode_cachep); 493 return err; 494} 495 496static void __exit exit_hfsplus_fs(void) 497{ 498 unregister_filesystem(&hfsplus_fs_type); 499 kmem_cache_destroy(hfsplus_inode_cachep); 500} 501 502module_init(init_hfsplus_fs) 503module_exit(exit_hfsplus_fs) 504