1/* 2 * linux/fs/hfsplus/inode.c 3 * 4 * Copyright (C) 2001 5 * Brad Boyer (flar@allandria.com) 6 * (C) 2003 Ardis Technologies <roman@ardistech.com> 7 * 8 * Inode handling routines 9 */ 10 11#include <linux/mm.h> 12#include <linux/fs.h> 13#include <linux/pagemap.h> 14#include <linux/mpage.h> 15#include <linux/sched.h> 16 17#include "hfsplus_fs.h" 18#include "hfsplus_raw.h" 19 20static int hfsplus_readpage(struct file *file, struct page *page) 21{ 22 return block_read_full_page(page, hfsplus_get_block); 23} 24 25static int hfsplus_writepage(struct page *page, struct writeback_control *wbc) 26{ 27 return block_write_full_page(page, hfsplus_get_block, wbc); 28} 29 30static int hfsplus_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) 31{ 32 return cont_prepare_write(page, from, to, hfsplus_get_block, 33 &HFSPLUS_I(page->mapping->host).phys_size); 34} 35 36static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block) 37{ 38 return generic_block_bmap(mapping, block, hfsplus_get_block); 39} 40 41static int hfsplus_releasepage(struct page *page, gfp_t mask) 42{ 43 struct inode *inode = page->mapping->host; 44 struct super_block *sb = inode->i_sb; 45 struct hfs_btree *tree; 46 struct hfs_bnode *node; 47 u32 nidx; 48 int i, res = 1; 49 50 switch (inode->i_ino) { 51 case HFSPLUS_EXT_CNID: 52 tree = HFSPLUS_SB(sb).ext_tree; 53 break; 54 case HFSPLUS_CAT_CNID: 55 tree = HFSPLUS_SB(sb).cat_tree; 56 break; 57 case HFSPLUS_ATTR_CNID: 58 tree = HFSPLUS_SB(sb).attr_tree; 59 break; 60 default: 61 BUG(); 62 return 0; 63 } 64 if (tree->node_size >= PAGE_CACHE_SIZE) { 65 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); 66 spin_lock(&tree->hash_lock); 67 node = hfs_bnode_findhash(tree, nidx); 68 if (!node) 69 ; 70 else if (atomic_read(&node->refcnt)) 71 res = 0; 72 if (res && node) { 73 hfs_bnode_unhash(node); 74 hfs_bnode_free(node); 75 } 76 spin_unlock(&tree->hash_lock); 77 } else { 78 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); 79 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); 80 spin_lock(&tree->hash_lock); 81 do { 82 node = hfs_bnode_findhash(tree, nidx++); 83 if (!node) 84 continue; 85 if (atomic_read(&node->refcnt)) { 86 res = 0; 87 break; 88 } 89 hfs_bnode_unhash(node); 90 hfs_bnode_free(node); 91 } while (--i && nidx < tree->node_count); 92 spin_unlock(&tree->hash_lock); 93 } 94 return res ? try_to_free_buffers(page) : 0; 95} 96 97static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb, 98 const struct iovec *iov, loff_t offset, unsigned long nr_segs) 99{ 100 struct file *file = iocb->ki_filp; 101 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; 102 103 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 104 offset, nr_segs, hfsplus_get_block, NULL); 105} 106 107static int hfsplus_writepages(struct address_space *mapping, 108 struct writeback_control *wbc) 109{ 110 return mpage_writepages(mapping, wbc, hfsplus_get_block); 111} 112 113const struct address_space_operations hfsplus_btree_aops = { 114 .readpage = hfsplus_readpage, 115 .writepage = hfsplus_writepage, 116 .sync_page = block_sync_page, 117 .prepare_write = hfsplus_prepare_write, 118 .commit_write = generic_commit_write, 119 .bmap = hfsplus_bmap, 120 .releasepage = hfsplus_releasepage, 121}; 122 123const struct address_space_operations hfsplus_aops = { 124 .readpage = hfsplus_readpage, 125 .writepage = hfsplus_writepage, 126 .sync_page = block_sync_page, 127 .prepare_write = hfsplus_prepare_write, 128 .commit_write = generic_commit_write, 129 .bmap = hfsplus_bmap, 130 .direct_IO = hfsplus_direct_IO, 131 .writepages = hfsplus_writepages, 132}; 133 134static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry, 135 struct nameidata *nd) 136{ 137 struct hfs_find_data fd; 138 struct super_block *sb = dir->i_sb; 139 struct inode *inode = NULL; 140 int err; 141 142 if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 143 goto out; 144 145 inode = HFSPLUS_I(dir).rsrc_inode; 146 if (inode) 147 goto out; 148 149 inode = new_inode(sb); 150 if (!inode) 151 return ERR_PTR(-ENOMEM); 152 153 inode->i_ino = dir->i_ino; 154 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 155 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 156 HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC; 157 158 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); 159 err = hfsplus_find_cat(sb, dir->i_ino, &fd); 160 if (!err) 161 err = hfsplus_cat_read_inode(inode, &fd); 162 hfs_find_exit(&fd); 163 if (err) { 164 iput(inode); 165 return ERR_PTR(err); 166 } 167 HFSPLUS_I(inode).rsrc_inode = dir; 168 HFSPLUS_I(dir).rsrc_inode = inode; 169 igrab(dir); 170 hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes); 171 mark_inode_dirty(inode); 172out: 173 d_add(dentry, inode); 174 return NULL; 175} 176 177static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir) 178{ 179 struct super_block *sb = inode->i_sb; 180 u16 mode; 181 182 mode = be16_to_cpu(perms->mode); 183 184 inode->i_uid = be32_to_cpu(perms->owner); 185 if (!inode->i_uid && !mode) 186 inode->i_uid = HFSPLUS_SB(sb).uid; 187 188 inode->i_gid = be32_to_cpu(perms->group); 189 if (!inode->i_gid && !mode) 190 inode->i_gid = HFSPLUS_SB(sb).gid; 191 192 if (dir) { 193 mode = mode ? (mode & S_IALLUGO) : 194 (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask)); 195 mode |= S_IFDIR; 196 } else if (!mode) 197 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & 198 ~(HFSPLUS_SB(sb).umask)); 199 inode->i_mode = mode; 200 201 HFSPLUS_I(inode).rootflags = perms->rootflags; 202 HFSPLUS_I(inode).userflags = perms->userflags; 203 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE) 204 inode->i_flags |= S_IMMUTABLE; 205 else 206 inode->i_flags &= ~S_IMMUTABLE; 207 if (perms->rootflags & HFSPLUS_FLG_APPEND) 208 inode->i_flags |= S_APPEND; 209 else 210 inode->i_flags &= ~S_APPEND; 211} 212 213static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms) 214{ 215 if (inode->i_flags & S_IMMUTABLE) 216 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE; 217 else 218 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE; 219 if (inode->i_flags & S_APPEND) 220 perms->rootflags |= HFSPLUS_FLG_APPEND; 221 else 222 perms->rootflags &= ~HFSPLUS_FLG_APPEND; 223 perms->userflags = HFSPLUS_I(inode).userflags; 224 perms->mode = cpu_to_be16(inode->i_mode); 225 perms->owner = cpu_to_be32(inode->i_uid); 226 perms->group = cpu_to_be32(inode->i_gid); 227 perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev); 228} 229 230static int hfsplus_permission(struct inode *inode, int mask, struct nameidata *nd) 231{ 232 /* MAY_EXEC is also used for lookup, if no x bit is set allow lookup, 233 * open_exec has the same test, so it's still not executable, if a x bit 234 * is set fall back to standard permission check. 235 */ 236 if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111)) 237 return 0; 238 return generic_permission(inode, mask, NULL); 239} 240 241 242static int hfsplus_file_open(struct inode *inode, struct file *file) 243{ 244 if (HFSPLUS_IS_RSRC(inode)) 245 inode = HFSPLUS_I(inode).rsrc_inode; 246 if (atomic_read(&file->f_count) != 1) 247 return 0; 248 atomic_inc(&HFSPLUS_I(inode).opencnt); 249 return 0; 250} 251 252static int hfsplus_file_release(struct inode *inode, struct file *file) 253{ 254 struct super_block *sb = inode->i_sb; 255 256 if (HFSPLUS_IS_RSRC(inode)) 257 inode = HFSPLUS_I(inode).rsrc_inode; 258 if (atomic_read(&file->f_count) != 0) 259 return 0; 260 if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) { 261 mutex_lock(&inode->i_mutex); 262 hfsplus_file_truncate(inode); 263 if (inode->i_flags & S_DEAD) { 264 hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 265 hfsplus_delete_inode(inode); 266 } 267 mutex_unlock(&inode->i_mutex); 268 } 269 return 0; 270} 271 272extern const struct inode_operations hfsplus_dir_inode_operations; 273extern struct file_operations hfsplus_dir_operations; 274 275static const struct inode_operations hfsplus_file_inode_operations = { 276 .lookup = hfsplus_file_lookup, 277 .truncate = hfsplus_file_truncate, 278 .permission = hfsplus_permission, 279 .setxattr = hfsplus_setxattr, 280 .getxattr = hfsplus_getxattr, 281 .listxattr = hfsplus_listxattr, 282}; 283 284static const struct file_operations hfsplus_file_operations = { 285 .llseek = generic_file_llseek, 286 .read = do_sync_read, 287 .aio_read = generic_file_aio_read, 288 .write = do_sync_write, 289 .aio_write = generic_file_aio_write, 290 .mmap = generic_file_mmap, 291 .sendfile = generic_file_sendfile, 292 .fsync = file_fsync, 293 .open = hfsplus_file_open, 294 .release = hfsplus_file_release, 295 .ioctl = hfsplus_ioctl, 296}; 297 298struct inode *hfsplus_new_inode(struct super_block *sb, int mode) 299{ 300 struct inode *inode = new_inode(sb); 301 if (!inode) 302 return NULL; 303 304 inode->i_ino = HFSPLUS_SB(sb).next_cnid++; 305 inode->i_mode = mode; 306 inode->i_uid = current->fsuid; 307 inode->i_gid = current->fsgid; 308 inode->i_nlink = 1; 309 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 310 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 311 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 312 atomic_set(&HFSPLUS_I(inode).opencnt, 0); 313 HFSPLUS_I(inode).flags = 0; 314 memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec)); 315 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 316 HFSPLUS_I(inode).alloc_blocks = 0; 317 HFSPLUS_I(inode).first_blocks = 0; 318 HFSPLUS_I(inode).cached_start = 0; 319 HFSPLUS_I(inode).cached_blocks = 0; 320 HFSPLUS_I(inode).phys_size = 0; 321 HFSPLUS_I(inode).fs_blocks = 0; 322 HFSPLUS_I(inode).rsrc_inode = NULL; 323 if (S_ISDIR(inode->i_mode)) { 324 inode->i_size = 2; 325 HFSPLUS_SB(sb).folder_count++; 326 inode->i_op = &hfsplus_dir_inode_operations; 327 inode->i_fop = &hfsplus_dir_operations; 328 } else if (S_ISREG(inode->i_mode)) { 329 HFSPLUS_SB(sb).file_count++; 330 inode->i_op = &hfsplus_file_inode_operations; 331 inode->i_fop = &hfsplus_file_operations; 332 inode->i_mapping->a_ops = &hfsplus_aops; 333 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks; 334 } else if (S_ISLNK(inode->i_mode)) { 335 HFSPLUS_SB(sb).file_count++; 336 inode->i_op = &page_symlink_inode_operations; 337 inode->i_mapping->a_ops = &hfsplus_aops; 338 HFSPLUS_I(inode).clump_blocks = 1; 339 } else 340 HFSPLUS_SB(sb).file_count++; 341 insert_inode_hash(inode); 342 mark_inode_dirty(inode); 343 sb->s_dirt = 1; 344 345 return inode; 346} 347 348void hfsplus_delete_inode(struct inode *inode) 349{ 350 struct super_block *sb = inode->i_sb; 351 352 if (S_ISDIR(inode->i_mode)) { 353 HFSPLUS_SB(sb).folder_count--; 354 sb->s_dirt = 1; 355 return; 356 } 357 HFSPLUS_SB(sb).file_count--; 358 if (S_ISREG(inode->i_mode)) { 359 if (!inode->i_nlink) { 360 inode->i_size = 0; 361 hfsplus_file_truncate(inode); 362 } 363 } else if (S_ISLNK(inode->i_mode)) { 364 inode->i_size = 0; 365 hfsplus_file_truncate(inode); 366 } 367 sb->s_dirt = 1; 368} 369 370void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 371{ 372 struct super_block *sb = inode->i_sb; 373 u32 count; 374 int i; 375 376 memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents, 377 sizeof(hfsplus_extent_rec)); 378 for (count = 0, i = 0; i < 8; i++) 379 count += be32_to_cpu(fork->extents[i].block_count); 380 HFSPLUS_I(inode).first_blocks = count; 381 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 382 HFSPLUS_I(inode).cached_start = 0; 383 HFSPLUS_I(inode).cached_blocks = 0; 384 385 HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks); 386 inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size); 387 HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 388 inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits); 389 /* Foxconn added start pling 05/31/2010 */ 390 /* Set the i_blocks field properly */ 391 inode->i_blocks = inode->i_size/512; 392 if (inode->i_size % 512) 393 inode->i_blocks++; 394 /* Foxconn added end pling 05/31/2010 */ 395 HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift; 396 if (!HFSPLUS_I(inode).clump_blocks) 397 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks : 398 HFSPLUS_SB(sb).data_clump_blocks; 399} 400 401void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 402{ 403 memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents, 404 sizeof(hfsplus_extent_rec)); 405 fork->total_size = cpu_to_be64(inode->i_size); 406 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks); 407} 408 409int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) 410{ 411 hfsplus_cat_entry entry; 412 int res = 0; 413 u16 type; 414 415 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); 416 417 HFSPLUS_I(inode).dev = 0; 418 if (type == HFSPLUS_FOLDER) { 419 struct hfsplus_cat_folder *folder = &entry.folder; 420 421 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) 422 /* panic? */; 423 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 424 sizeof(struct hfsplus_cat_folder)); 425 hfsplus_get_perms(inode, &folder->permissions, 1); 426 inode->i_nlink = 1; 427 inode->i_size = 2 + be32_to_cpu(folder->valence); 428 inode->i_atime = hfsp_mt2ut(folder->access_date); 429 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); 430 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date); 431 HFSPLUS_I(inode).create_date = folder->create_date; 432 HFSPLUS_I(inode).fs_blocks = 0; 433 inode->i_op = &hfsplus_dir_inode_operations; 434 inode->i_fop = &hfsplus_dir_operations; 435 } else if (type == HFSPLUS_FILE) { 436 struct hfsplus_cat_file *file = &entry.file; 437 438 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) 439 /* panic? */; 440 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 441 sizeof(struct hfsplus_cat_file)); 442 443 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ? 444 &file->data_fork : &file->rsrc_fork); 445 hfsplus_get_perms(inode, &file->permissions, 0); 446 inode->i_nlink = 1; 447 if (S_ISREG(inode->i_mode)) { 448 if (file->permissions.dev) 449 inode->i_nlink = be32_to_cpu(file->permissions.dev); 450 inode->i_op = &hfsplus_file_inode_operations; 451 inode->i_fop = &hfsplus_file_operations; 452 inode->i_mapping->a_ops = &hfsplus_aops; 453 } else if (S_ISLNK(inode->i_mode)) { 454 inode->i_op = &page_symlink_inode_operations; 455 inode->i_mapping->a_ops = &hfsplus_aops; 456 } else { 457 init_special_inode(inode, inode->i_mode, 458 be32_to_cpu(file->permissions.dev)); 459 } 460 inode->i_atime = hfsp_mt2ut(file->access_date); 461 inode->i_mtime = hfsp_mt2ut(file->content_mod_date); 462 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date); 463 HFSPLUS_I(inode).create_date = file->create_date; 464 } else { 465 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n"); 466 res = -EIO; 467 } 468 return res; 469} 470 471int hfsplus_cat_write_inode(struct inode *inode) 472{ 473 struct inode *main_inode = inode; 474 struct hfs_find_data fd; 475 hfsplus_cat_entry entry; 476 477 if (HFSPLUS_IS_RSRC(inode)) 478 main_inode = HFSPLUS_I(inode).rsrc_inode; 479 480 if (!main_inode->i_nlink) 481 return 0; 482 483 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd)) 484 /* panic? */ 485 return -EIO; 486 487 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) 488 /* panic? */ 489 goto out; 490 491 if (S_ISDIR(main_inode->i_mode)) { 492 struct hfsplus_cat_folder *folder = &entry.folder; 493 494 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) 495 /* panic? */; 496 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 497 sizeof(struct hfsplus_cat_folder)); 498 /* simple node checks? */ 499 hfsplus_set_perms(inode, &folder->permissions); 500 folder->access_date = hfsp_ut2mt(inode->i_atime); 501 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); 502 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 503 folder->valence = cpu_to_be32(inode->i_size - 2); 504 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 505 sizeof(struct hfsplus_cat_folder)); 506 } else if (HFSPLUS_IS_RSRC(inode)) { 507 struct hfsplus_cat_file *file = &entry.file; 508 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 509 sizeof(struct hfsplus_cat_file)); 510 hfsplus_inode_write_fork(inode, &file->rsrc_fork); 511 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 512 sizeof(struct hfsplus_cat_file)); 513 } else { 514 struct hfsplus_cat_file *file = &entry.file; 515 516 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) 517 /* panic? */; 518 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 519 sizeof(struct hfsplus_cat_file)); 520 hfsplus_inode_write_fork(inode, &file->data_fork); 521 if (S_ISREG(inode->i_mode)) 522 HFSPLUS_I(inode).dev = inode->i_nlink; 523 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 524 HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev); 525 hfsplus_set_perms(inode, &file->permissions); 526 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE) 527 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); 528 else 529 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); 530 file->access_date = hfsp_ut2mt(inode->i_atime); 531 file->content_mod_date = hfsp_ut2mt(inode->i_mtime); 532 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 533 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 534 sizeof(struct hfsplus_cat_file)); 535 } 536out: 537 hfs_find_exit(&fd); 538 return 0; 539} 540