1 /* 2 * linux/fs/hfs/inode.c 3 * 4 * Copyright (C) 1995-1997 Paul H. Hargrove 5 * (C) 2003 Ardis Technologies <roman@ardistech.com> 6 * This file may be distributed under the terms of the GNU General Public License. 7 * 8 * This file contains inode-related functions which do not depend on 9 * which scheme is being used to represent forks. 10 * 11 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds 12 */ 13 14 #include <linux/pagemap.h> 15 #include <linux/mpage.h> 16 #include <linux/sched.h> 17 #include <linux/uio.h> 18 19 #include "hfs_fs.h" 20 #include "btree.h" 21 22 static const struct file_operations hfs_file_operations; 23 static const struct inode_operations hfs_file_inode_operations; 24 25 /*================ Variable-like macros ================*/ 26 27 #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO) 28 29 static int hfs_writepage(struct page *page, struct writeback_control *wbc) 30 { 31 return block_write_full_page(page, hfs_get_block, wbc); 32 } 33 34 static int hfs_readpage(struct file *file, struct page *page) 35 { 36 return block_read_full_page(page, hfs_get_block); 37 } 38 39 static void hfs_write_failed(struct address_space *mapping, loff_t to) 40 { 41 struct inode *inode = mapping->host; 42 43 if (to > inode->i_size) { 44 truncate_pagecache(inode, inode->i_size); 45 hfs_file_truncate(inode); 46 } 47 } 48 49 static int hfs_write_begin(struct file *file, struct address_space *mapping, 50 loff_t pos, unsigned len, unsigned flags, 51 struct page **pagep, void **fsdata) 52 { 53 int ret; 54 55 *pagep = NULL; 56 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, 57 hfs_get_block, 58 &HFS_I(mapping->host)->phys_size); 59 if (unlikely(ret)) 60 hfs_write_failed(mapping, pos + len); 61 62 return ret; 63 } 64 65 static sector_t hfs_bmap(struct address_space *mapping, sector_t block) 66 { 67 return generic_block_bmap(mapping, block, hfs_get_block); 68 } 69 70 static int hfs_releasepage(struct page *page, gfp_t mask) 71 { 72 struct inode *inode = page->mapping->host; 73 struct super_block *sb = inode->i_sb; 74 struct hfs_btree *tree; 75 struct hfs_bnode *node; 76 u32 nidx; 77 int i, res = 1; 78 79 switch (inode->i_ino) { 80 case HFS_EXT_CNID: 81 tree = HFS_SB(sb)->ext_tree; 82 break; 83 case HFS_CAT_CNID: 84 tree = HFS_SB(sb)->cat_tree; 85 break; 86 default: 87 BUG(); 88 return 0; 89 } 90 91 if (!tree) 92 return 0; 93 94 if (tree->node_size >= PAGE_CACHE_SIZE) { 95 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); 96 spin_lock(&tree->hash_lock); 97 node = hfs_bnode_findhash(tree, nidx); 98 if (!node) 99 ; 100 else if (atomic_read(&node->refcnt)) 101 res = 0; 102 if (res && node) { 103 hfs_bnode_unhash(node); 104 hfs_bnode_free(node); 105 } 106 spin_unlock(&tree->hash_lock); 107 } else { 108 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); 109 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); 110 spin_lock(&tree->hash_lock); 111 do { 112 node = hfs_bnode_findhash(tree, nidx++); 113 if (!node) 114 continue; 115 if (atomic_read(&node->refcnt)) { 116 res = 0; 117 break; 118 } 119 hfs_bnode_unhash(node); 120 hfs_bnode_free(node); 121 } while (--i && nidx < tree->node_count); 122 spin_unlock(&tree->hash_lock); 123 } 124 return res ? try_to_free_buffers(page) : 0; 125 } 126 127 static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter, 128 loff_t offset) 129 { 130 struct file *file = iocb->ki_filp; 131 struct address_space *mapping = file->f_mapping; 132 struct inode *inode = file_inode(file)->i_mapping->host; 133 size_t count = iov_iter_count(iter); 134 ssize_t ret; 135 136 ret = blockdev_direct_IO(iocb, inode, iter, offset, hfs_get_block); 137 138 /* 139 * In case of error extending write may have instantiated a few 140 * blocks outside i_size. Trim these off again. 141 */ 142 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { 143 loff_t isize = i_size_read(inode); 144 loff_t end = offset + count; 145 146 if (end > isize) 147 hfs_write_failed(mapping, end); 148 } 149 150 return ret; 151 } 152 153 static int hfs_writepages(struct address_space *mapping, 154 struct writeback_control *wbc) 155 { 156 return mpage_writepages(mapping, wbc, hfs_get_block); 157 } 158 159 const struct address_space_operations hfs_btree_aops = { 160 .readpage = hfs_readpage, 161 .writepage = hfs_writepage, 162 .write_begin = hfs_write_begin, 163 .write_end = generic_write_end, 164 .bmap = hfs_bmap, 165 .releasepage = hfs_releasepage, 166 }; 167 168 const struct address_space_operations hfs_aops = { 169 .readpage = hfs_readpage, 170 .writepage = hfs_writepage, 171 .write_begin = hfs_write_begin, 172 .write_end = generic_write_end, 173 .bmap = hfs_bmap, 174 .direct_IO = hfs_direct_IO, 175 .writepages = hfs_writepages, 176 }; 177 178 /* 179 * hfs_new_inode 180 */ 181 struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, umode_t mode) 182 { 183 struct super_block *sb = dir->i_sb; 184 struct inode *inode = new_inode(sb); 185 if (!inode) 186 return NULL; 187 188 mutex_init(&HFS_I(inode)->extents_lock); 189 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); 190 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name); 191 inode->i_ino = HFS_SB(sb)->next_id++; 192 inode->i_mode = mode; 193 inode->i_uid = current_fsuid(); 194 inode->i_gid = current_fsgid(); 195 set_nlink(inode, 1); 196 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 197 HFS_I(inode)->flags = 0; 198 HFS_I(inode)->rsrc_inode = NULL; 199 HFS_I(inode)->fs_blocks = 0; 200 if (S_ISDIR(mode)) { 201 inode->i_size = 2; 202 HFS_SB(sb)->folder_count++; 203 if (dir->i_ino == HFS_ROOT_CNID) 204 HFS_SB(sb)->root_dirs++; 205 inode->i_op = &hfs_dir_inode_operations; 206 inode->i_fop = &hfs_dir_operations; 207 inode->i_mode |= S_IRWXUGO; 208 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; 209 } else if (S_ISREG(mode)) { 210 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 211 HFS_SB(sb)->file_count++; 212 if (dir->i_ino == HFS_ROOT_CNID) 213 HFS_SB(sb)->root_files++; 214 inode->i_op = &hfs_file_inode_operations; 215 inode->i_fop = &hfs_file_operations; 216 inode->i_mapping->a_ops = &hfs_aops; 217 inode->i_mode |= S_IRUGO|S_IXUGO; 218 if (mode & S_IWUSR) 219 inode->i_mode |= S_IWUGO; 220 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; 221 HFS_I(inode)->phys_size = 0; 222 HFS_I(inode)->alloc_blocks = 0; 223 HFS_I(inode)->first_blocks = 0; 224 HFS_I(inode)->cached_start = 0; 225 HFS_I(inode)->cached_blocks = 0; 226 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); 227 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); 228 } 229 insert_inode_hash(inode); 230 mark_inode_dirty(inode); 231 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 232 hfs_mark_mdb_dirty(sb); 233 234 return inode; 235 } 236 237 void hfs_delete_inode(struct inode *inode) 238 { 239 struct super_block *sb = inode->i_sb; 240 241 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino); 242 if (S_ISDIR(inode->i_mode)) { 243 HFS_SB(sb)->folder_count--; 244 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 245 HFS_SB(sb)->root_dirs--; 246 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 247 hfs_mark_mdb_dirty(sb); 248 return; 249 } 250 HFS_SB(sb)->file_count--; 251 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 252 HFS_SB(sb)->root_files--; 253 if (S_ISREG(inode->i_mode)) { 254 if (!inode->i_nlink) { 255 inode->i_size = 0; 256 hfs_file_truncate(inode); 257 } 258 } 259 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 260 hfs_mark_mdb_dirty(sb); 261 } 262 263 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, 264 __be32 __log_size, __be32 phys_size, u32 clump_size) 265 { 266 struct super_block *sb = inode->i_sb; 267 u32 log_size = be32_to_cpu(__log_size); 268 u16 count; 269 int i; 270 271 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); 272 for (count = 0, i = 0; i < 3; i++) 273 count += be16_to_cpu(ext[i].count); 274 HFS_I(inode)->first_blocks = count; 275 276 inode->i_size = HFS_I(inode)->phys_size = log_size; 277 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 278 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); 279 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / 280 HFS_SB(sb)->alloc_blksz; 281 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; 282 if (!HFS_I(inode)->clump_blocks) 283 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 284 } 285 286 struct hfs_iget_data { 287 struct hfs_cat_key *key; 288 hfs_cat_rec *rec; 289 }; 290 291 static int hfs_test_inode(struct inode *inode, void *data) 292 { 293 struct hfs_iget_data *idata = data; 294 hfs_cat_rec *rec; 295 296 rec = idata->rec; 297 switch (rec->type) { 298 case HFS_CDR_DIR: 299 return inode->i_ino == be32_to_cpu(rec->dir.DirID); 300 case HFS_CDR_FIL: 301 return inode->i_ino == be32_to_cpu(rec->file.FlNum); 302 default: 303 BUG(); 304 return 1; 305 } 306 } 307 308 /* 309 * hfs_read_inode 310 */ 311 static int hfs_read_inode(struct inode *inode, void *data) 312 { 313 struct hfs_iget_data *idata = data; 314 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 315 hfs_cat_rec *rec; 316 317 HFS_I(inode)->flags = 0; 318 HFS_I(inode)->rsrc_inode = NULL; 319 mutex_init(&HFS_I(inode)->extents_lock); 320 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); 321 322 /* Initialize the inode */ 323 inode->i_uid = hsb->s_uid; 324 inode->i_gid = hsb->s_gid; 325 set_nlink(inode, 1); 326 327 if (idata->key) 328 HFS_I(inode)->cat_key = *idata->key; 329 else 330 HFS_I(inode)->flags |= HFS_FLG_RSRC; 331 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; 332 333 rec = idata->rec; 334 switch (rec->type) { 335 case HFS_CDR_FIL: 336 if (!HFS_IS_RSRC(inode)) { 337 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, 338 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); 339 } else { 340 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, 341 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); 342 } 343 344 inode->i_ino = be32_to_cpu(rec->file.FlNum); 345 inode->i_mode = S_IRUGO | S_IXUGO; 346 if (!(rec->file.Flags & HFS_FIL_LOCK)) 347 inode->i_mode |= S_IWUGO; 348 inode->i_mode &= ~hsb->s_file_umask; 349 inode->i_mode |= S_IFREG; 350 inode->i_ctime = inode->i_atime = inode->i_mtime = 351 hfs_m_to_utime(rec->file.MdDat); 352 inode->i_op = &hfs_file_inode_operations; 353 inode->i_fop = &hfs_file_operations; 354 inode->i_mapping->a_ops = &hfs_aops; 355 break; 356 case HFS_CDR_DIR: 357 inode->i_ino = be32_to_cpu(rec->dir.DirID); 358 inode->i_size = be16_to_cpu(rec->dir.Val) + 2; 359 HFS_I(inode)->fs_blocks = 0; 360 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); 361 inode->i_ctime = inode->i_atime = inode->i_mtime = 362 hfs_m_to_utime(rec->dir.MdDat); 363 inode->i_op = &hfs_dir_inode_operations; 364 inode->i_fop = &hfs_dir_operations; 365 break; 366 default: 367 make_bad_inode(inode); 368 } 369 return 0; 370 } 371 372 /* 373 * __hfs_iget() 374 * 375 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in 376 * the catalog B-tree and the 'type' of the desired file return the 377 * inode for that file/directory or NULL. Note that 'type' indicates 378 * whether we want the actual file or directory, or the corresponding 379 * metadata (AppleDouble header file or CAP metadata file). 380 */ 381 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) 382 { 383 struct hfs_iget_data data = { key, rec }; 384 struct inode *inode; 385 u32 cnid; 386 387 switch (rec->type) { 388 case HFS_CDR_DIR: 389 cnid = be32_to_cpu(rec->dir.DirID); 390 break; 391 case HFS_CDR_FIL: 392 cnid = be32_to_cpu(rec->file.FlNum); 393 break; 394 default: 395 return NULL; 396 } 397 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); 398 if (inode && (inode->i_state & I_NEW)) 399 unlock_new_inode(inode); 400 return inode; 401 } 402 403 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, 404 __be32 *log_size, __be32 *phys_size) 405 { 406 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); 407 408 if (log_size) 409 *log_size = cpu_to_be32(inode->i_size); 410 if (phys_size) 411 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * 412 HFS_SB(inode->i_sb)->alloc_blksz); 413 } 414 415 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc) 416 { 417 struct inode *main_inode = inode; 418 struct hfs_find_data fd; 419 hfs_cat_rec rec; 420 int res; 421 422 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino); 423 res = hfs_ext_write_extent(inode); 424 if (res) 425 return res; 426 427 if (inode->i_ino < HFS_FIRSTUSER_CNID) { 428 switch (inode->i_ino) { 429 case HFS_ROOT_CNID: 430 break; 431 case HFS_EXT_CNID: 432 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); 433 return 0; 434 case HFS_CAT_CNID: 435 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); 436 return 0; 437 default: 438 BUG(); 439 return -EIO; 440 } 441 } 442 443 if (HFS_IS_RSRC(inode)) 444 main_inode = HFS_I(inode)->rsrc_inode; 445 446 if (!main_inode->i_nlink) 447 return 0; 448 449 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) 450 /* panic? */ 451 return -EIO; 452 453 fd.search_key->cat = HFS_I(main_inode)->cat_key; 454 if (hfs_brec_find(&fd)) 455 /* panic? */ 456 goto out; 457 458 if (S_ISDIR(main_inode->i_mode)) { 459 if (fd.entrylength < sizeof(struct hfs_cat_dir)) 460 /* panic? */; 461 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 462 sizeof(struct hfs_cat_dir)); 463 if (rec.type != HFS_CDR_DIR || 464 be32_to_cpu(rec.dir.DirID) != inode->i_ino) { 465 } 466 467 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime); 468 rec.dir.Val = cpu_to_be16(inode->i_size - 2); 469 470 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 471 sizeof(struct hfs_cat_dir)); 472 } else if (HFS_IS_RSRC(inode)) { 473 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 474 sizeof(struct hfs_cat_file)); 475 hfs_inode_write_fork(inode, rec.file.RExtRec, 476 &rec.file.RLgLen, &rec.file.RPyLen); 477 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 478 sizeof(struct hfs_cat_file)); 479 } else { 480 if (fd.entrylength < sizeof(struct hfs_cat_file)) 481 /* panic? */; 482 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 483 sizeof(struct hfs_cat_file)); 484 if (rec.type != HFS_CDR_FIL || 485 be32_to_cpu(rec.file.FlNum) != inode->i_ino) { 486 } 487 488 if (inode->i_mode & S_IWUSR) 489 rec.file.Flags &= ~HFS_FIL_LOCK; 490 else 491 rec.file.Flags |= HFS_FIL_LOCK; 492 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); 493 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime); 494 495 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 496 sizeof(struct hfs_cat_file)); 497 } 498 out: 499 hfs_find_exit(&fd); 500 return 0; 501 } 502 503 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, 504 unsigned int flags) 505 { 506 struct inode *inode = NULL; 507 hfs_cat_rec rec; 508 struct hfs_find_data fd; 509 int res; 510 511 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 512 goto out; 513 514 inode = HFS_I(dir)->rsrc_inode; 515 if (inode) 516 goto out; 517 518 inode = new_inode(dir->i_sb); 519 if (!inode) 520 return ERR_PTR(-ENOMEM); 521 522 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); 523 if (res) { 524 iput(inode); 525 return ERR_PTR(res); 526 } 527 fd.search_key->cat = HFS_I(dir)->cat_key; 528 res = hfs_brec_read(&fd, &rec, sizeof(rec)); 529 if (!res) { 530 struct hfs_iget_data idata = { NULL, &rec }; 531 hfs_read_inode(inode, &idata); 532 } 533 hfs_find_exit(&fd); 534 if (res) { 535 iput(inode); 536 return ERR_PTR(res); 537 } 538 HFS_I(inode)->rsrc_inode = dir; 539 HFS_I(dir)->rsrc_inode = inode; 540 igrab(dir); 541 hlist_add_fake(&inode->i_hash); 542 mark_inode_dirty(inode); 543 out: 544 d_add(dentry, inode); 545 return NULL; 546 } 547 548 void hfs_evict_inode(struct inode *inode) 549 { 550 truncate_inode_pages_final(&inode->i_data); 551 clear_inode(inode); 552 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { 553 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 554 iput(HFS_I(inode)->rsrc_inode); 555 } 556 } 557 558 static int hfs_file_open(struct inode *inode, struct file *file) 559 { 560 if (HFS_IS_RSRC(inode)) 561 inode = HFS_I(inode)->rsrc_inode; 562 atomic_inc(&HFS_I(inode)->opencnt); 563 return 0; 564 } 565 566 static int hfs_file_release(struct inode *inode, struct file *file) 567 { 568 //struct super_block *sb = inode->i_sb; 569 570 if (HFS_IS_RSRC(inode)) 571 inode = HFS_I(inode)->rsrc_inode; 572 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { 573 mutex_lock(&inode->i_mutex); 574 hfs_file_truncate(inode); 575 //if (inode->i_flags & S_DEAD) { 576 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 577 // hfs_delete_inode(inode); 578 //} 579 mutex_unlock(&inode->i_mutex); 580 } 581 return 0; 582 } 583 584 /* 585 * hfs_notify_change() 586 * 587 * Based very closely on fs/msdos/inode.c by Werner Almesberger 588 * 589 * This is the notify_change() field in the super_operations structure 590 * for HFS file systems. The purpose is to take that changes made to 591 * an inode and apply then in a filesystem-dependent manner. In this 592 * case the process has a few of tasks to do: 593 * 1) prevent changes to the i_uid and i_gid fields. 594 * 2) map file permissions to the closest allowable permissions 595 * 3) Since multiple Linux files can share the same on-disk inode under 596 * HFS (for instance the data and resource forks of a file) a change 597 * to permissions must be applied to all other in-core inodes which 598 * correspond to the same HFS file. 599 */ 600 601 int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr) 602 { 603 struct inode *inode = d_inode(dentry); 604 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 605 int error; 606 607 error = inode_change_ok(inode, attr); /* basic permission checks */ 608 if (error) 609 return error; 610 611 /* no uig/gid changes and limit which mode bits can be set */ 612 if (((attr->ia_valid & ATTR_UID) && 613 (!uid_eq(attr->ia_uid, hsb->s_uid))) || 614 ((attr->ia_valid & ATTR_GID) && 615 (!gid_eq(attr->ia_gid, hsb->s_gid))) || 616 ((attr->ia_valid & ATTR_MODE) && 617 ((S_ISDIR(inode->i_mode) && 618 (attr->ia_mode != inode->i_mode)) || 619 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { 620 return hsb->s_quiet ? 0 : error; 621 } 622 623 if (attr->ia_valid & ATTR_MODE) { 624 /* Only the 'w' bits can ever change and only all together. */ 625 if (attr->ia_mode & S_IWUSR) 626 attr->ia_mode = inode->i_mode | S_IWUGO; 627 else 628 attr->ia_mode = inode->i_mode & ~S_IWUGO; 629 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; 630 } 631 632 if ((attr->ia_valid & ATTR_SIZE) && 633 attr->ia_size != i_size_read(inode)) { 634 inode_dio_wait(inode); 635 636 error = inode_newsize_ok(inode, attr->ia_size); 637 if (error) 638 return error; 639 640 truncate_setsize(inode, attr->ia_size); 641 hfs_file_truncate(inode); 642 } 643 644 setattr_copy(inode, attr); 645 mark_inode_dirty(inode); 646 return 0; 647 } 648 649 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end, 650 int datasync) 651 { 652 struct inode *inode = filp->f_mapping->host; 653 struct super_block * sb; 654 int ret, err; 655 656 ret = filemap_write_and_wait_range(inode->i_mapping, start, end); 657 if (ret) 658 return ret; 659 mutex_lock(&inode->i_mutex); 660 661 /* sync the inode to buffers */ 662 ret = write_inode_now(inode, 0); 663 664 /* sync the superblock to buffers */ 665 sb = inode->i_sb; 666 flush_delayed_work(&HFS_SB(sb)->mdb_work); 667 /* .. finally sync the buffers to disk */ 668 err = sync_blockdev(sb->s_bdev); 669 if (!ret) 670 ret = err; 671 mutex_unlock(&inode->i_mutex); 672 return ret; 673 } 674 675 static const struct file_operations hfs_file_operations = { 676 .llseek = generic_file_llseek, 677 .read_iter = generic_file_read_iter, 678 .write_iter = generic_file_write_iter, 679 .mmap = generic_file_mmap, 680 .splice_read = generic_file_splice_read, 681 .fsync = hfs_file_fsync, 682 .open = hfs_file_open, 683 .release = hfs_file_release, 684 }; 685 686 static const struct inode_operations hfs_file_inode_operations = { 687 .lookup = hfs_file_lookup, 688 .setattr = hfs_inode_setattr, 689 .setxattr = hfs_setxattr, 690 .getxattr = hfs_getxattr, 691 .listxattr = hfs_listxattr, 692 }; 693