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