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/cred.h> 18 #include <linux/uio.h> 19 #include <linux/xattr.h> 20 #include <linux/blkdev.h> 21 22 #include "hfs_fs.h" 23 #include "btree.h" 24 25 static const struct file_operations hfs_file_operations; 26 static const struct inode_operations hfs_file_inode_operations; 27 28 /*================ Variable-like macros ================*/ 29 30 #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO) 31 32 static int hfs_writepage(struct page *page, struct writeback_control *wbc) 33 { 34 return block_write_full_page(page, hfs_get_block, wbc); 35 } 36 37 static int hfs_read_folio(struct file *file, struct folio *folio) 38 { 39 return block_read_full_folio(folio, hfs_get_block); 40 } 41 42 static void hfs_write_failed(struct address_space *mapping, loff_t to) 43 { 44 struct inode *inode = mapping->host; 45 46 if (to > inode->i_size) { 47 truncate_pagecache(inode, inode->i_size); 48 hfs_file_truncate(inode); 49 } 50 } 51 52 int hfs_write_begin(struct file *file, struct address_space *mapping, 53 loff_t pos, unsigned len, struct page **pagep, void **fsdata) 54 { 55 int ret; 56 57 *pagep = NULL; 58 ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata, 59 hfs_get_block, 60 &HFS_I(mapping->host)->phys_size); 61 if (unlikely(ret)) 62 hfs_write_failed(mapping, pos + len); 63 64 return ret; 65 } 66 67 static sector_t hfs_bmap(struct address_space *mapping, sector_t block) 68 { 69 return generic_block_bmap(mapping, block, hfs_get_block); 70 } 71 72 static bool hfs_release_folio(struct folio *folio, gfp_t mask) 73 { 74 struct inode *inode = folio->mapping->host; 75 struct super_block *sb = inode->i_sb; 76 struct hfs_btree *tree; 77 struct hfs_bnode *node; 78 u32 nidx; 79 int i; 80 bool res = true; 81 82 switch (inode->i_ino) { 83 case HFS_EXT_CNID: 84 tree = HFS_SB(sb)->ext_tree; 85 break; 86 case HFS_CAT_CNID: 87 tree = HFS_SB(sb)->cat_tree; 88 break; 89 default: 90 BUG(); 91 return false; 92 } 93 94 if (!tree) 95 return false; 96 97 if (tree->node_size >= PAGE_SIZE) { 98 nidx = folio->index >> (tree->node_size_shift - PAGE_SHIFT); 99 spin_lock(&tree->hash_lock); 100 node = hfs_bnode_findhash(tree, nidx); 101 if (!node) 102 ; 103 else if (atomic_read(&node->refcnt)) 104 res = false; 105 if (res && node) { 106 hfs_bnode_unhash(node); 107 hfs_bnode_free(node); 108 } 109 spin_unlock(&tree->hash_lock); 110 } else { 111 nidx = folio->index << (PAGE_SHIFT - tree->node_size_shift); 112 i = 1 << (PAGE_SHIFT - tree->node_size_shift); 113 spin_lock(&tree->hash_lock); 114 do { 115 node = hfs_bnode_findhash(tree, nidx++); 116 if (!node) 117 continue; 118 if (atomic_read(&node->refcnt)) { 119 res = false; 120 break; 121 } 122 hfs_bnode_unhash(node); 123 hfs_bnode_free(node); 124 } while (--i && nidx < tree->node_count); 125 spin_unlock(&tree->hash_lock); 126 } 127 return res ? try_to_free_buffers(folio) : false; 128 } 129 130 static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 131 { 132 struct file *file = iocb->ki_filp; 133 struct address_space *mapping = file->f_mapping; 134 struct inode *inode = mapping->host; 135 size_t count = iov_iter_count(iter); 136 ssize_t ret; 137 138 ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block); 139 140 /* 141 * In case of error extending write may have instantiated a few 142 * blocks outside i_size. Trim these off again. 143 */ 144 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { 145 loff_t isize = i_size_read(inode); 146 loff_t end = iocb->ki_pos + count; 147 148 if (end > isize) 149 hfs_write_failed(mapping, end); 150 } 151 152 return ret; 153 } 154 155 static int hfs_writepages(struct address_space *mapping, 156 struct writeback_control *wbc) 157 { 158 return mpage_writepages(mapping, wbc, hfs_get_block); 159 } 160 161 const struct address_space_operations hfs_btree_aops = { 162 .dirty_folio = block_dirty_folio, 163 .invalidate_folio = block_invalidate_folio, 164 .read_folio = hfs_read_folio, 165 .writepage = hfs_writepage, 166 .write_begin = hfs_write_begin, 167 .write_end = generic_write_end, 168 .bmap = hfs_bmap, 169 .release_folio = hfs_release_folio, 170 }; 171 172 const struct address_space_operations hfs_aops = { 173 .dirty_folio = block_dirty_folio, 174 .invalidate_folio = block_invalidate_folio, 175 .read_folio = hfs_read_folio, 176 .write_begin = hfs_write_begin, 177 .write_end = generic_write_end, 178 .bmap = hfs_bmap, 179 .direct_IO = hfs_direct_IO, 180 .writepages = hfs_writepages, 181 .migrate_folio = buffer_migrate_folio, 182 }; 183 184 /* 185 * hfs_new_inode 186 */ 187 struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode) 188 { 189 struct super_block *sb = dir->i_sb; 190 struct inode *inode = new_inode(sb); 191 if (!inode) 192 return NULL; 193 194 mutex_init(&HFS_I(inode)->extents_lock); 195 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); 196 spin_lock_init(&HFS_I(inode)->open_dir_lock); 197 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name); 198 inode->i_ino = HFS_SB(sb)->next_id++; 199 inode->i_mode = mode; 200 inode->i_uid = current_fsuid(); 201 inode->i_gid = current_fsgid(); 202 set_nlink(inode, 1); 203 inode->i_mtime = inode->i_atime = inode_set_ctime_current(inode); 204 HFS_I(inode)->flags = 0; 205 HFS_I(inode)->rsrc_inode = NULL; 206 HFS_I(inode)->fs_blocks = 0; 207 if (S_ISDIR(mode)) { 208 inode->i_size = 2; 209 HFS_SB(sb)->folder_count++; 210 if (dir->i_ino == HFS_ROOT_CNID) 211 HFS_SB(sb)->root_dirs++; 212 inode->i_op = &hfs_dir_inode_operations; 213 inode->i_fop = &hfs_dir_operations; 214 inode->i_mode |= S_IRWXUGO; 215 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; 216 } else if (S_ISREG(mode)) { 217 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 218 HFS_SB(sb)->file_count++; 219 if (dir->i_ino == HFS_ROOT_CNID) 220 HFS_SB(sb)->root_files++; 221 inode->i_op = &hfs_file_inode_operations; 222 inode->i_fop = &hfs_file_operations; 223 inode->i_mapping->a_ops = &hfs_aops; 224 inode->i_mode |= S_IRUGO|S_IXUGO; 225 if (mode & S_IWUSR) 226 inode->i_mode |= S_IWUGO; 227 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; 228 HFS_I(inode)->phys_size = 0; 229 HFS_I(inode)->alloc_blocks = 0; 230 HFS_I(inode)->first_blocks = 0; 231 HFS_I(inode)->cached_start = 0; 232 HFS_I(inode)->cached_blocks = 0; 233 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); 234 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); 235 } 236 insert_inode_hash(inode); 237 mark_inode_dirty(inode); 238 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 239 hfs_mark_mdb_dirty(sb); 240 241 return inode; 242 } 243 244 void hfs_delete_inode(struct inode *inode) 245 { 246 struct super_block *sb = inode->i_sb; 247 248 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino); 249 if (S_ISDIR(inode->i_mode)) { 250 HFS_SB(sb)->folder_count--; 251 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 252 HFS_SB(sb)->root_dirs--; 253 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 254 hfs_mark_mdb_dirty(sb); 255 return; 256 } 257 HFS_SB(sb)->file_count--; 258 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 259 HFS_SB(sb)->root_files--; 260 if (S_ISREG(inode->i_mode)) { 261 if (!inode->i_nlink) { 262 inode->i_size = 0; 263 hfs_file_truncate(inode); 264 } 265 } 266 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 267 hfs_mark_mdb_dirty(sb); 268 } 269 270 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, 271 __be32 __log_size, __be32 phys_size, u32 clump_size) 272 { 273 struct super_block *sb = inode->i_sb; 274 u32 log_size = be32_to_cpu(__log_size); 275 u16 count; 276 int i; 277 278 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); 279 for (count = 0, i = 0; i < 3; i++) 280 count += be16_to_cpu(ext[i].count); 281 HFS_I(inode)->first_blocks = count; 282 283 inode->i_size = HFS_I(inode)->phys_size = log_size; 284 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 285 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); 286 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / 287 HFS_SB(sb)->alloc_blksz; 288 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; 289 if (!HFS_I(inode)->clump_blocks) 290 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 291 } 292 293 struct hfs_iget_data { 294 struct hfs_cat_key *key; 295 hfs_cat_rec *rec; 296 }; 297 298 static int hfs_test_inode(struct inode *inode, void *data) 299 { 300 struct hfs_iget_data *idata = data; 301 hfs_cat_rec *rec; 302 303 rec = idata->rec; 304 switch (rec->type) { 305 case HFS_CDR_DIR: 306 return inode->i_ino == be32_to_cpu(rec->dir.DirID); 307 case HFS_CDR_FIL: 308 return inode->i_ino == be32_to_cpu(rec->file.FlNum); 309 default: 310 BUG(); 311 return 1; 312 } 313 } 314 315 /* 316 * hfs_read_inode 317 */ 318 static int hfs_read_inode(struct inode *inode, void *data) 319 { 320 struct hfs_iget_data *idata = data; 321 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 322 hfs_cat_rec *rec; 323 324 HFS_I(inode)->flags = 0; 325 HFS_I(inode)->rsrc_inode = NULL; 326 mutex_init(&HFS_I(inode)->extents_lock); 327 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); 328 spin_lock_init(&HFS_I(inode)->open_dir_lock); 329 330 /* Initialize the inode */ 331 inode->i_uid = hsb->s_uid; 332 inode->i_gid = hsb->s_gid; 333 set_nlink(inode, 1); 334 335 if (idata->key) 336 HFS_I(inode)->cat_key = *idata->key; 337 else 338 HFS_I(inode)->flags |= HFS_FLG_RSRC; 339 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; 340 341 rec = idata->rec; 342 switch (rec->type) { 343 case HFS_CDR_FIL: 344 if (!HFS_IS_RSRC(inode)) { 345 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, 346 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); 347 } else { 348 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, 349 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); 350 } 351 352 inode->i_ino = be32_to_cpu(rec->file.FlNum); 353 inode->i_mode = S_IRUGO | S_IXUGO; 354 if (!(rec->file.Flags & HFS_FIL_LOCK)) 355 inode->i_mode |= S_IWUGO; 356 inode->i_mode &= ~hsb->s_file_umask; 357 inode->i_mode |= S_IFREG; 358 inode->i_atime = inode->i_mtime = inode_set_ctime_to_ts(inode, 359 hfs_m_to_utime(rec->file.MdDat)); 360 inode->i_op = &hfs_file_inode_operations; 361 inode->i_fop = &hfs_file_operations; 362 inode->i_mapping->a_ops = &hfs_aops; 363 break; 364 case HFS_CDR_DIR: 365 inode->i_ino = be32_to_cpu(rec->dir.DirID); 366 inode->i_size = be16_to_cpu(rec->dir.Val) + 2; 367 HFS_I(inode)->fs_blocks = 0; 368 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); 369 inode->i_atime = inode->i_mtime = inode_set_ctime_to_ts(inode, 370 hfs_m_to_utime(rec->dir.MdDat)); 371 inode->i_op = &hfs_dir_inode_operations; 372 inode->i_fop = &hfs_dir_operations; 373 break; 374 default: 375 make_bad_inode(inode); 376 } 377 return 0; 378 } 379 380 /* 381 * __hfs_iget() 382 * 383 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in 384 * the catalog B-tree and the 'type' of the desired file return the 385 * inode for that file/directory or NULL. Note that 'type' indicates 386 * whether we want the actual file or directory, or the corresponding 387 * metadata (AppleDouble header file or CAP metadata file). 388 */ 389 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) 390 { 391 struct hfs_iget_data data = { key, rec }; 392 struct inode *inode; 393 u32 cnid; 394 395 switch (rec->type) { 396 case HFS_CDR_DIR: 397 cnid = be32_to_cpu(rec->dir.DirID); 398 break; 399 case HFS_CDR_FIL: 400 cnid = be32_to_cpu(rec->file.FlNum); 401 break; 402 default: 403 return NULL; 404 } 405 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); 406 if (inode && (inode->i_state & I_NEW)) 407 unlock_new_inode(inode); 408 return inode; 409 } 410 411 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, 412 __be32 *log_size, __be32 *phys_size) 413 { 414 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); 415 416 if (log_size) 417 *log_size = cpu_to_be32(inode->i_size); 418 if (phys_size) 419 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * 420 HFS_SB(inode->i_sb)->alloc_blksz); 421 } 422 423 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc) 424 { 425 struct inode *main_inode = inode; 426 struct hfs_find_data fd; 427 hfs_cat_rec rec; 428 int res; 429 430 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino); 431 res = hfs_ext_write_extent(inode); 432 if (res) 433 return res; 434 435 if (inode->i_ino < HFS_FIRSTUSER_CNID) { 436 switch (inode->i_ino) { 437 case HFS_ROOT_CNID: 438 break; 439 case HFS_EXT_CNID: 440 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); 441 return 0; 442 case HFS_CAT_CNID: 443 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); 444 return 0; 445 default: 446 BUG(); 447 return -EIO; 448 } 449 } 450 451 if (HFS_IS_RSRC(inode)) 452 main_inode = HFS_I(inode)->rsrc_inode; 453 454 if (!main_inode->i_nlink) 455 return 0; 456 457 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) 458 /* panic? */ 459 return -EIO; 460 461 res = -EIO; 462 if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN) 463 goto out; 464 fd.search_key->cat = HFS_I(main_inode)->cat_key; 465 if (hfs_brec_find(&fd)) 466 goto out; 467 468 if (S_ISDIR(main_inode->i_mode)) { 469 if (fd.entrylength < sizeof(struct hfs_cat_dir)) 470 goto out; 471 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 472 sizeof(struct hfs_cat_dir)); 473 if (rec.type != HFS_CDR_DIR || 474 be32_to_cpu(rec.dir.DirID) != inode->i_ino) { 475 } 476 477 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime); 478 rec.dir.Val = cpu_to_be16(inode->i_size - 2); 479 480 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 481 sizeof(struct hfs_cat_dir)); 482 } else if (HFS_IS_RSRC(inode)) { 483 if (fd.entrylength < sizeof(struct hfs_cat_file)) 484 goto out; 485 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 486 sizeof(struct hfs_cat_file)); 487 hfs_inode_write_fork(inode, rec.file.RExtRec, 488 &rec.file.RLgLen, &rec.file.RPyLen); 489 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 490 sizeof(struct hfs_cat_file)); 491 } else { 492 if (fd.entrylength < sizeof(struct hfs_cat_file)) 493 goto out; 494 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 495 sizeof(struct hfs_cat_file)); 496 if (rec.type != HFS_CDR_FIL || 497 be32_to_cpu(rec.file.FlNum) != inode->i_ino) { 498 } 499 500 if (inode->i_mode & S_IWUSR) 501 rec.file.Flags &= ~HFS_FIL_LOCK; 502 else 503 rec.file.Flags |= HFS_FIL_LOCK; 504 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); 505 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime); 506 507 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 508 sizeof(struct hfs_cat_file)); 509 } 510 res = 0; 511 out: 512 hfs_find_exit(&fd); 513 return res; 514 } 515 516 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, 517 unsigned int flags) 518 { 519 struct inode *inode = NULL; 520 hfs_cat_rec rec; 521 struct hfs_find_data fd; 522 int res; 523 524 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 525 goto out; 526 527 inode = HFS_I(dir)->rsrc_inode; 528 if (inode) 529 goto out; 530 531 inode = new_inode(dir->i_sb); 532 if (!inode) 533 return ERR_PTR(-ENOMEM); 534 535 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); 536 if (res) { 537 iput(inode); 538 return ERR_PTR(res); 539 } 540 fd.search_key->cat = HFS_I(dir)->cat_key; 541 res = hfs_brec_read(&fd, &rec, sizeof(rec)); 542 if (!res) { 543 struct hfs_iget_data idata = { NULL, &rec }; 544 hfs_read_inode(inode, &idata); 545 } 546 hfs_find_exit(&fd); 547 if (res) { 548 iput(inode); 549 return ERR_PTR(res); 550 } 551 HFS_I(inode)->rsrc_inode = dir; 552 HFS_I(dir)->rsrc_inode = inode; 553 igrab(dir); 554 inode_fake_hash(inode); 555 mark_inode_dirty(inode); 556 dont_mount(dentry); 557 out: 558 return d_splice_alias(inode, dentry); 559 } 560 561 void hfs_evict_inode(struct inode *inode) 562 { 563 truncate_inode_pages_final(&inode->i_data); 564 clear_inode(inode); 565 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { 566 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 567 iput(HFS_I(inode)->rsrc_inode); 568 } 569 } 570 571 static int hfs_file_open(struct inode *inode, struct file *file) 572 { 573 if (HFS_IS_RSRC(inode)) 574 inode = HFS_I(inode)->rsrc_inode; 575 atomic_inc(&HFS_I(inode)->opencnt); 576 return 0; 577 } 578 579 static int hfs_file_release(struct inode *inode, struct file *file) 580 { 581 //struct super_block *sb = inode->i_sb; 582 583 if (HFS_IS_RSRC(inode)) 584 inode = HFS_I(inode)->rsrc_inode; 585 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { 586 inode_lock(inode); 587 hfs_file_truncate(inode); 588 //if (inode->i_flags & S_DEAD) { 589 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 590 // hfs_delete_inode(inode); 591 //} 592 inode_unlock(inode); 593 } 594 return 0; 595 } 596 597 /* 598 * hfs_notify_change() 599 * 600 * Based very closely on fs/msdos/inode.c by Werner Almesberger 601 * 602 * This is the notify_change() field in the super_operations structure 603 * for HFS file systems. The purpose is to take that changes made to 604 * an inode and apply then in a filesystem-dependent manner. In this 605 * case the process has a few of tasks to do: 606 * 1) prevent changes to the i_uid and i_gid fields. 607 * 2) map file permissions to the closest allowable permissions 608 * 3) Since multiple Linux files can share the same on-disk inode under 609 * HFS (for instance the data and resource forks of a file) a change 610 * to permissions must be applied to all other in-core inodes which 611 * correspond to the same HFS file. 612 */ 613 614 int hfs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 615 struct iattr *attr) 616 { 617 struct inode *inode = d_inode(dentry); 618 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 619 int error; 620 621 error = setattr_prepare(&nop_mnt_idmap, dentry, 622 attr); /* basic permission checks */ 623 if (error) 624 return error; 625 626 /* no uig/gid changes and limit which mode bits can be set */ 627 if (((attr->ia_valid & ATTR_UID) && 628 (!uid_eq(attr->ia_uid, hsb->s_uid))) || 629 ((attr->ia_valid & ATTR_GID) && 630 (!gid_eq(attr->ia_gid, hsb->s_gid))) || 631 ((attr->ia_valid & ATTR_MODE) && 632 ((S_ISDIR(inode->i_mode) && 633 (attr->ia_mode != inode->i_mode)) || 634 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { 635 return hsb->s_quiet ? 0 : error; 636 } 637 638 if (attr->ia_valid & ATTR_MODE) { 639 /* Only the 'w' bits can ever change and only all together. */ 640 if (attr->ia_mode & S_IWUSR) 641 attr->ia_mode = inode->i_mode | S_IWUGO; 642 else 643 attr->ia_mode = inode->i_mode & ~S_IWUGO; 644 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; 645 } 646 647 if ((attr->ia_valid & ATTR_SIZE) && 648 attr->ia_size != i_size_read(inode)) { 649 inode_dio_wait(inode); 650 651 error = inode_newsize_ok(inode, attr->ia_size); 652 if (error) 653 return error; 654 655 truncate_setsize(inode, attr->ia_size); 656 hfs_file_truncate(inode); 657 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode); 658 } 659 660 setattr_copy(&nop_mnt_idmap, inode, attr); 661 mark_inode_dirty(inode); 662 return 0; 663 } 664 665 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end, 666 int datasync) 667 { 668 struct inode *inode = filp->f_mapping->host; 669 struct super_block * sb; 670 int ret, err; 671 672 ret = file_write_and_wait_range(filp, start, end); 673 if (ret) 674 return ret; 675 inode_lock(inode); 676 677 /* sync the inode to buffers */ 678 ret = write_inode_now(inode, 0); 679 680 /* sync the superblock to buffers */ 681 sb = inode->i_sb; 682 flush_delayed_work(&HFS_SB(sb)->mdb_work); 683 /* .. finally sync the buffers to disk */ 684 err = sync_blockdev(sb->s_bdev); 685 if (!ret) 686 ret = err; 687 inode_unlock(inode); 688 return ret; 689 } 690 691 static const struct file_operations hfs_file_operations = { 692 .llseek = generic_file_llseek, 693 .read_iter = generic_file_read_iter, 694 .write_iter = generic_file_write_iter, 695 .mmap = generic_file_mmap, 696 .splice_read = filemap_splice_read, 697 .fsync = hfs_file_fsync, 698 .open = hfs_file_open, 699 .release = hfs_file_release, 700 }; 701 702 static const struct inode_operations hfs_file_inode_operations = { 703 .lookup = hfs_file_lookup, 704 .setattr = hfs_inode_setattr, 705 .listxattr = generic_listxattr, 706 }; 707