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_read_folio(struct file *file, struct folio *folio) 33 { 34 return block_read_full_folio(folio, hfs_get_block); 35 } 36 37 static void hfs_write_failed(struct address_space *mapping, loff_t to) 38 { 39 struct inode *inode = mapping->host; 40 41 if (to > inode->i_size) { 42 truncate_pagecache(inode, inode->i_size); 43 hfs_file_truncate(inode); 44 } 45 } 46 47 int hfs_write_begin(const struct kiocb *iocb, struct address_space *mapping, 48 loff_t pos, unsigned int len, struct folio **foliop, 49 void **fsdata) 50 { 51 int ret; 52 53 ret = cont_write_begin(iocb, mapping, pos, len, foliop, fsdata, 54 hfs_get_block, 55 &HFS_I(mapping->host)->phys_size); 56 if (unlikely(ret)) 57 hfs_write_failed(mapping, pos + len); 58 59 return ret; 60 } 61 62 static sector_t hfs_bmap(struct address_space *mapping, sector_t block) 63 { 64 return generic_block_bmap(mapping, block, hfs_get_block); 65 } 66 67 static bool hfs_release_folio(struct folio *folio, gfp_t mask) 68 { 69 struct inode *inode = folio->mapping->host; 70 struct super_block *sb = inode->i_sb; 71 struct hfs_btree *tree; 72 struct hfs_bnode *node; 73 u32 nidx; 74 int i; 75 bool res = true; 76 77 switch (inode->i_ino) { 78 case HFS_EXT_CNID: 79 tree = HFS_SB(sb)->ext_tree; 80 break; 81 case HFS_CAT_CNID: 82 tree = HFS_SB(sb)->cat_tree; 83 break; 84 default: 85 BUG(); 86 return false; 87 } 88 89 if (!tree) 90 return false; 91 92 if (tree->node_size >= PAGE_SIZE) { 93 nidx = folio->index >> (tree->node_size_shift - PAGE_SHIFT); 94 spin_lock(&tree->hash_lock); 95 node = hfs_bnode_findhash(tree, nidx); 96 if (!node) 97 ; 98 else if (atomic_read(&node->refcnt)) 99 res = false; 100 if (res && node) { 101 hfs_bnode_unhash(node); 102 hfs_bnode_free(node); 103 } 104 spin_unlock(&tree->hash_lock); 105 } else { 106 nidx = folio->index << (PAGE_SHIFT - tree->node_size_shift); 107 i = 1 << (PAGE_SHIFT - tree->node_size_shift); 108 spin_lock(&tree->hash_lock); 109 do { 110 node = hfs_bnode_findhash(tree, nidx++); 111 if (!node) 112 continue; 113 if (atomic_read(&node->refcnt)) { 114 res = false; 115 break; 116 } 117 hfs_bnode_unhash(node); 118 hfs_bnode_free(node); 119 } while (--i && nidx < tree->node_count); 120 spin_unlock(&tree->hash_lock); 121 } 122 return res ? try_to_free_buffers(folio) : false; 123 } 124 125 static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 126 { 127 struct file *file = iocb->ki_filp; 128 struct address_space *mapping = file->f_mapping; 129 struct inode *inode = mapping->host; 130 size_t count = iov_iter_count(iter); 131 ssize_t ret; 132 133 ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block); 134 135 /* 136 * In case of error extending write may have instantiated a few 137 * blocks outside i_size. Trim these off again. 138 */ 139 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { 140 loff_t isize = i_size_read(inode); 141 loff_t end = iocb->ki_pos + count; 142 143 if (end > isize) 144 hfs_write_failed(mapping, end); 145 } 146 147 return ret; 148 } 149 150 static int hfs_writepages(struct address_space *mapping, 151 struct writeback_control *wbc) 152 { 153 return mpage_writepages(mapping, wbc, hfs_get_block); 154 } 155 156 const struct address_space_operations hfs_btree_aops = { 157 .dirty_folio = block_dirty_folio, 158 .invalidate_folio = block_invalidate_folio, 159 .read_folio = hfs_read_folio, 160 .writepages = hfs_writepages, 161 .write_begin = hfs_write_begin, 162 .write_end = generic_write_end, 163 .migrate_folio = buffer_migrate_folio, 164 .bmap = hfs_bmap, 165 .release_folio = hfs_release_folio, 166 }; 167 168 const struct address_space_operations hfs_aops = { 169 .dirty_folio = block_dirty_folio, 170 .invalidate_folio = block_invalidate_folio, 171 .read_folio = hfs_read_folio, 172 .write_begin = hfs_write_begin, 173 .write_end = generic_write_end, 174 .bmap = hfs_bmap, 175 .direct_IO = hfs_direct_IO, 176 .writepages = hfs_writepages, 177 .migrate_folio = buffer_migrate_folio, 178 }; 179 180 /* 181 * hfs_new_inode 182 */ 183 struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode) 184 { 185 struct super_block *sb = dir->i_sb; 186 struct inode *inode = new_inode(sb); 187 s64 next_id; 188 s64 file_count; 189 s64 folder_count; 190 191 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 next_id = atomic64_inc_return(&HFS_SB(sb)->next_id); 199 BUG_ON(next_id > U32_MAX); 200 inode->i_ino = (u32)next_id; 201 inode->i_mode = mode; 202 inode->i_uid = current_fsuid(); 203 inode->i_gid = current_fsgid(); 204 set_nlink(inode, 1); 205 simple_inode_init_ts(inode); 206 HFS_I(inode)->flags = 0; 207 HFS_I(inode)->rsrc_inode = NULL; 208 HFS_I(inode)->fs_blocks = 0; 209 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; 210 if (S_ISDIR(mode)) { 211 inode->i_size = 2; 212 folder_count = atomic64_inc_return(&HFS_SB(sb)->folder_count); 213 BUG_ON(folder_count > U32_MAX); 214 if (dir->i_ino == HFS_ROOT_CNID) 215 HFS_SB(sb)->root_dirs++; 216 inode->i_op = &hfs_dir_inode_operations; 217 inode->i_fop = &hfs_dir_operations; 218 inode->i_mode |= S_IRWXUGO; 219 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; 220 } else if (S_ISREG(mode)) { 221 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 222 file_count = atomic64_inc_return(&HFS_SB(sb)->file_count); 223 BUG_ON(file_count > U32_MAX); 224 if (dir->i_ino == HFS_ROOT_CNID) 225 HFS_SB(sb)->root_files++; 226 inode->i_op = &hfs_file_inode_operations; 227 inode->i_fop = &hfs_file_operations; 228 inode->i_mapping->a_ops = &hfs_aops; 229 inode->i_mode |= S_IRUGO|S_IXUGO; 230 if (mode & S_IWUSR) 231 inode->i_mode |= S_IWUGO; 232 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; 233 HFS_I(inode)->phys_size = 0; 234 HFS_I(inode)->alloc_blocks = 0; 235 HFS_I(inode)->first_blocks = 0; 236 HFS_I(inode)->cached_start = 0; 237 HFS_I(inode)->cached_blocks = 0; 238 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); 239 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); 240 } 241 insert_inode_hash(inode); 242 mark_inode_dirty(inode); 243 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 244 hfs_mark_mdb_dirty(sb); 245 246 return inode; 247 } 248 249 void hfs_delete_inode(struct inode *inode) 250 { 251 struct super_block *sb = inode->i_sb; 252 253 hfs_dbg("ino %lu\n", inode->i_ino); 254 if (S_ISDIR(inode->i_mode)) { 255 BUG_ON(atomic64_read(&HFS_SB(sb)->folder_count) > U32_MAX); 256 atomic64_dec(&HFS_SB(sb)->folder_count); 257 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 258 HFS_SB(sb)->root_dirs--; 259 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 260 hfs_mark_mdb_dirty(sb); 261 return; 262 } 263 264 BUG_ON(atomic64_read(&HFS_SB(sb)->file_count) > U32_MAX); 265 atomic64_dec(&HFS_SB(sb)->file_count); 266 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 267 HFS_SB(sb)->root_files--; 268 if (S_ISREG(inode->i_mode)) { 269 if (!inode->i_nlink) { 270 inode->i_size = 0; 271 hfs_file_truncate(inode); 272 } 273 } 274 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 275 hfs_mark_mdb_dirty(sb); 276 } 277 278 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, 279 __be32 __log_size, __be32 phys_size, u32 clump_size) 280 { 281 struct super_block *sb = inode->i_sb; 282 u32 log_size = be32_to_cpu(__log_size); 283 u16 count; 284 int i; 285 286 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); 287 for (count = 0, i = 0; i < 3; i++) 288 count += be16_to_cpu(ext[i].count); 289 HFS_I(inode)->first_blocks = count; 290 HFS_I(inode)->cached_start = 0; 291 HFS_I(inode)->cached_blocks = 0; 292 293 inode->i_size = HFS_I(inode)->phys_size = log_size; 294 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 295 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); 296 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / 297 HFS_SB(sb)->alloc_blksz; 298 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; 299 if (!HFS_I(inode)->clump_blocks) 300 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 301 } 302 303 struct hfs_iget_data { 304 struct hfs_cat_key *key; 305 hfs_cat_rec *rec; 306 }; 307 308 static int hfs_test_inode(struct inode *inode, void *data) 309 { 310 struct hfs_iget_data *idata = data; 311 hfs_cat_rec *rec; 312 313 rec = idata->rec; 314 switch (rec->type) { 315 case HFS_CDR_DIR: 316 return inode->i_ino == be32_to_cpu(rec->dir.DirID); 317 case HFS_CDR_FIL: 318 return inode->i_ino == be32_to_cpu(rec->file.FlNum); 319 default: 320 BUG(); 321 return 1; 322 } 323 } 324 325 /* 326 * hfs_read_inode 327 */ 328 static int hfs_read_inode(struct inode *inode, void *data) 329 { 330 struct hfs_iget_data *idata = data; 331 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 332 hfs_cat_rec *rec; 333 334 HFS_I(inode)->flags = 0; 335 HFS_I(inode)->rsrc_inode = NULL; 336 mutex_init(&HFS_I(inode)->extents_lock); 337 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); 338 spin_lock_init(&HFS_I(inode)->open_dir_lock); 339 340 /* Initialize the inode */ 341 inode->i_uid = hsb->s_uid; 342 inode->i_gid = hsb->s_gid; 343 set_nlink(inode, 1); 344 345 if (idata->key) 346 HFS_I(inode)->cat_key = *idata->key; 347 else 348 HFS_I(inode)->flags |= HFS_FLG_RSRC; 349 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; 350 351 rec = idata->rec; 352 switch (rec->type) { 353 case HFS_CDR_FIL: 354 if (!HFS_IS_RSRC(inode)) { 355 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, 356 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); 357 } else { 358 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, 359 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); 360 } 361 362 inode->i_ino = be32_to_cpu(rec->file.FlNum); 363 inode->i_mode = S_IRUGO | S_IXUGO; 364 if (!(rec->file.Flags & HFS_FIL_LOCK)) 365 inode->i_mode |= S_IWUGO; 366 inode->i_mode &= ~hsb->s_file_umask; 367 inode->i_mode |= S_IFREG; 368 inode_set_mtime_to_ts(inode, 369 inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, hfs_m_to_utime(rec->file.MdDat)))); 370 inode->i_op = &hfs_file_inode_operations; 371 inode->i_fop = &hfs_file_operations; 372 inode->i_mapping->a_ops = &hfs_aops; 373 break; 374 case HFS_CDR_DIR: 375 inode->i_ino = be32_to_cpu(rec->dir.DirID); 376 inode->i_size = be16_to_cpu(rec->dir.Val) + 2; 377 HFS_I(inode)->fs_blocks = 0; 378 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); 379 inode_set_mtime_to_ts(inode, 380 inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, hfs_m_to_utime(rec->dir.MdDat)))); 381 inode->i_op = &hfs_dir_inode_operations; 382 inode->i_fop = &hfs_dir_operations; 383 break; 384 default: 385 make_bad_inode(inode); 386 } 387 return 0; 388 } 389 390 /* 391 * __hfs_iget() 392 * 393 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in 394 * the catalog B-tree and the 'type' of the desired file return the 395 * inode for that file/directory or NULL. Note that 'type' indicates 396 * whether we want the actual file or directory, or the corresponding 397 * metadata (AppleDouble header file or CAP metadata file). 398 */ 399 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) 400 { 401 struct hfs_iget_data data = { key, rec }; 402 struct inode *inode; 403 u32 cnid; 404 405 switch (rec->type) { 406 case HFS_CDR_DIR: 407 cnid = be32_to_cpu(rec->dir.DirID); 408 break; 409 case HFS_CDR_FIL: 410 cnid = be32_to_cpu(rec->file.FlNum); 411 break; 412 default: 413 return NULL; 414 } 415 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); 416 if (inode && (inode_state_read_once(inode) & I_NEW)) 417 unlock_new_inode(inode); 418 return inode; 419 } 420 421 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, 422 __be32 *log_size, __be32 *phys_size) 423 { 424 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); 425 426 if (log_size) 427 *log_size = cpu_to_be32(inode->i_size); 428 if (phys_size) 429 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * 430 HFS_SB(inode->i_sb)->alloc_blksz); 431 } 432 433 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc) 434 { 435 struct inode *main_inode = inode; 436 struct hfs_find_data fd; 437 hfs_cat_rec rec; 438 int res; 439 440 hfs_dbg("ino %lu\n", inode->i_ino); 441 res = hfs_ext_write_extent(inode); 442 if (res) 443 return res; 444 445 if (inode->i_ino < HFS_FIRSTUSER_CNID) { 446 switch (inode->i_ino) { 447 case HFS_ROOT_CNID: 448 break; 449 case HFS_EXT_CNID: 450 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); 451 return 0; 452 case HFS_CAT_CNID: 453 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); 454 return 0; 455 default: 456 BUG(); 457 return -EIO; 458 } 459 } 460 461 if (HFS_IS_RSRC(inode)) 462 main_inode = HFS_I(inode)->rsrc_inode; 463 464 if (!main_inode->i_nlink) 465 return 0; 466 467 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) 468 /* panic? */ 469 return -EIO; 470 471 res = -EIO; 472 if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN) 473 goto out; 474 fd.search_key->cat = HFS_I(main_inode)->cat_key; 475 if (hfs_brec_find(&fd)) 476 goto out; 477 478 if (S_ISDIR(main_inode->i_mode)) { 479 if (fd.entrylength < sizeof(struct hfs_cat_dir)) 480 goto out; 481 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 482 sizeof(struct hfs_cat_dir)); 483 if (rec.type != HFS_CDR_DIR || 484 be32_to_cpu(rec.dir.DirID) != inode->i_ino) { 485 } 486 487 rec.dir.MdDat = hfs_u_to_mtime(inode_get_mtime(inode)); 488 rec.dir.Val = cpu_to_be16(inode->i_size - 2); 489 490 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 491 sizeof(struct hfs_cat_dir)); 492 } else if (HFS_IS_RSRC(inode)) { 493 if (fd.entrylength < sizeof(struct hfs_cat_file)) 494 goto out; 495 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 496 sizeof(struct hfs_cat_file)); 497 hfs_inode_write_fork(inode, rec.file.RExtRec, 498 &rec.file.RLgLen, &rec.file.RPyLen); 499 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 500 sizeof(struct hfs_cat_file)); 501 } else { 502 if (fd.entrylength < sizeof(struct hfs_cat_file)) 503 goto out; 504 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 505 sizeof(struct hfs_cat_file)); 506 if (rec.type != HFS_CDR_FIL || 507 be32_to_cpu(rec.file.FlNum) != inode->i_ino) { 508 } 509 510 if (inode->i_mode & S_IWUSR) 511 rec.file.Flags &= ~HFS_FIL_LOCK; 512 else 513 rec.file.Flags |= HFS_FIL_LOCK; 514 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); 515 rec.file.MdDat = hfs_u_to_mtime(inode_get_mtime(inode)); 516 517 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 518 sizeof(struct hfs_cat_file)); 519 } 520 res = 0; 521 out: 522 hfs_find_exit(&fd); 523 return res; 524 } 525 526 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, 527 unsigned int flags) 528 { 529 struct inode *inode = NULL; 530 hfs_cat_rec rec; 531 struct hfs_find_data fd; 532 int res; 533 534 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 535 goto out; 536 537 inode = HFS_I(dir)->rsrc_inode; 538 if (inode) 539 goto out; 540 541 inode = new_inode(dir->i_sb); 542 if (!inode) 543 return ERR_PTR(-ENOMEM); 544 545 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); 546 if (res) { 547 iput(inode); 548 return ERR_PTR(res); 549 } 550 fd.search_key->cat = HFS_I(dir)->cat_key; 551 res = hfs_brec_read(&fd, &rec, sizeof(rec)); 552 if (!res) { 553 struct hfs_iget_data idata = { NULL, &rec }; 554 hfs_read_inode(inode, &idata); 555 } 556 hfs_find_exit(&fd); 557 if (res) { 558 iput(inode); 559 return ERR_PTR(res); 560 } 561 HFS_I(inode)->rsrc_inode = dir; 562 HFS_I(dir)->rsrc_inode = inode; 563 igrab(dir); 564 inode_fake_hash(inode); 565 mark_inode_dirty(inode); 566 dont_mount(dentry); 567 out: 568 return d_splice_alias(inode, dentry); 569 } 570 571 void hfs_evict_inode(struct inode *inode) 572 { 573 truncate_inode_pages_final(&inode->i_data); 574 clear_inode(inode); 575 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { 576 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 577 iput(HFS_I(inode)->rsrc_inode); 578 } 579 } 580 581 static int hfs_file_open(struct inode *inode, struct file *file) 582 { 583 if (HFS_IS_RSRC(inode)) 584 inode = HFS_I(inode)->rsrc_inode; 585 atomic_inc(&HFS_I(inode)->opencnt); 586 return 0; 587 } 588 589 static int hfs_file_release(struct inode *inode, struct file *file) 590 { 591 //struct super_block *sb = inode->i_sb; 592 593 if (HFS_IS_RSRC(inode)) 594 inode = HFS_I(inode)->rsrc_inode; 595 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { 596 inode_lock(inode); 597 hfs_file_truncate(inode); 598 //if (inode->i_flags & S_DEAD) { 599 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 600 // hfs_delete_inode(inode); 601 //} 602 inode_unlock(inode); 603 } 604 return 0; 605 } 606 607 /* 608 * hfs_notify_change() 609 * 610 * Based very closely on fs/msdos/inode.c by Werner Almesberger 611 * 612 * This is the notify_change() field in the super_operations structure 613 * for HFS file systems. The purpose is to take that changes made to 614 * an inode and apply then in a filesystem-dependent manner. In this 615 * case the process has a few of tasks to do: 616 * 1) prevent changes to the i_uid and i_gid fields. 617 * 2) map file permissions to the closest allowable permissions 618 * 3) Since multiple Linux files can share the same on-disk inode under 619 * HFS (for instance the data and resource forks of a file) a change 620 * to permissions must be applied to all other in-core inodes which 621 * correspond to the same HFS file. 622 */ 623 624 int hfs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 625 struct iattr *attr) 626 { 627 struct inode *inode = d_inode(dentry); 628 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 629 int error; 630 631 error = setattr_prepare(&nop_mnt_idmap, dentry, 632 attr); /* basic permission checks */ 633 if (error) 634 return error; 635 636 /* no uig/gid changes and limit which mode bits can be set */ 637 if (((attr->ia_valid & ATTR_UID) && 638 (!uid_eq(attr->ia_uid, hsb->s_uid))) || 639 ((attr->ia_valid & ATTR_GID) && 640 (!gid_eq(attr->ia_gid, hsb->s_gid))) || 641 ((attr->ia_valid & ATTR_MODE) && 642 ((S_ISDIR(inode->i_mode) && 643 (attr->ia_mode != inode->i_mode)) || 644 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { 645 return hsb->s_quiet ? 0 : error; 646 } 647 648 if (attr->ia_valid & ATTR_MODE) { 649 /* Only the 'w' bits can ever change and only all together. */ 650 if (attr->ia_mode & S_IWUSR) 651 attr->ia_mode = inode->i_mode | S_IWUGO; 652 else 653 attr->ia_mode = inode->i_mode & ~S_IWUGO; 654 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; 655 } 656 657 if ((attr->ia_valid & ATTR_SIZE) && 658 attr->ia_size != i_size_read(inode)) { 659 inode_dio_wait(inode); 660 661 error = inode_newsize_ok(inode, attr->ia_size); 662 if (error) 663 return error; 664 665 truncate_setsize(inode, attr->ia_size); 666 hfs_file_truncate(inode); 667 simple_inode_init_ts(inode); 668 } 669 670 setattr_copy(&nop_mnt_idmap, inode, attr); 671 mark_inode_dirty(inode); 672 return 0; 673 } 674 675 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end, 676 int datasync) 677 { 678 struct inode *inode = filp->f_mapping->host; 679 struct super_block * sb; 680 int ret, err; 681 682 ret = file_write_and_wait_range(filp, start, end); 683 if (ret) 684 return ret; 685 inode_lock(inode); 686 687 /* sync the inode to buffers */ 688 ret = write_inode_now(inode, 0); 689 690 /* sync the superblock to buffers */ 691 sb = inode->i_sb; 692 flush_delayed_work(&HFS_SB(sb)->mdb_work); 693 /* .. finally sync the buffers to disk */ 694 err = sync_blockdev(sb->s_bdev); 695 if (!ret) 696 ret = err; 697 inode_unlock(inode); 698 return ret; 699 } 700 701 static const struct file_operations hfs_file_operations = { 702 .llseek = generic_file_llseek, 703 .read_iter = generic_file_read_iter, 704 .write_iter = generic_file_write_iter, 705 .mmap_prepare = generic_file_mmap_prepare, 706 .splice_read = filemap_splice_read, 707 .splice_write = iter_file_splice_write, 708 .fsync = hfs_file_fsync, 709 .open = hfs_file_open, 710 .release = hfs_file_release, 711 }; 712 713 static const struct inode_operations hfs_file_inode_operations = { 714 .lookup = hfs_file_lookup, 715 .setattr = hfs_inode_setattr, 716 .listxattr = generic_listxattr, 717 }; 718