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 page **pagep, void **fsdata) 49 { 50 int ret; 51 52 *pagep = NULL; 53 ret = cont_write_begin(file, mapping, pos, len, pagep, 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 if (!inode) 188 return NULL; 189 190 mutex_init(&HFS_I(inode)->extents_lock); 191 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); 192 spin_lock_init(&HFS_I(inode)->open_dir_lock); 193 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name); 194 inode->i_ino = HFS_SB(sb)->next_id++; 195 inode->i_mode = mode; 196 inode->i_uid = current_fsuid(); 197 inode->i_gid = current_fsgid(); 198 set_nlink(inode, 1); 199 simple_inode_init_ts(inode); 200 HFS_I(inode)->flags = 0; 201 HFS_I(inode)->rsrc_inode = NULL; 202 HFS_I(inode)->fs_blocks = 0; 203 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; 204 if (S_ISDIR(mode)) { 205 inode->i_size = 2; 206 HFS_SB(sb)->folder_count++; 207 if (dir->i_ino == HFS_ROOT_CNID) 208 HFS_SB(sb)->root_dirs++; 209 inode->i_op = &hfs_dir_inode_operations; 210 inode->i_fop = &hfs_dir_operations; 211 inode->i_mode |= S_IRWXUGO; 212 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; 213 } else if (S_ISREG(mode)) { 214 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 215 HFS_SB(sb)->file_count++; 216 if (dir->i_ino == HFS_ROOT_CNID) 217 HFS_SB(sb)->root_files++; 218 inode->i_op = &hfs_file_inode_operations; 219 inode->i_fop = &hfs_file_operations; 220 inode->i_mapping->a_ops = &hfs_aops; 221 inode->i_mode |= S_IRUGO|S_IXUGO; 222 if (mode & S_IWUSR) 223 inode->i_mode |= S_IWUGO; 224 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; 225 HFS_I(inode)->phys_size = 0; 226 HFS_I(inode)->alloc_blocks = 0; 227 HFS_I(inode)->first_blocks = 0; 228 HFS_I(inode)->cached_start = 0; 229 HFS_I(inode)->cached_blocks = 0; 230 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); 231 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); 232 } 233 insert_inode_hash(inode); 234 mark_inode_dirty(inode); 235 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 236 hfs_mark_mdb_dirty(sb); 237 238 return inode; 239 } 240 241 void hfs_delete_inode(struct inode *inode) 242 { 243 struct super_block *sb = inode->i_sb; 244 245 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino); 246 if (S_ISDIR(inode->i_mode)) { 247 HFS_SB(sb)->folder_count--; 248 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 249 HFS_SB(sb)->root_dirs--; 250 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 251 hfs_mark_mdb_dirty(sb); 252 return; 253 } 254 HFS_SB(sb)->file_count--; 255 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 256 HFS_SB(sb)->root_files--; 257 if (S_ISREG(inode->i_mode)) { 258 if (!inode->i_nlink) { 259 inode->i_size = 0; 260 hfs_file_truncate(inode); 261 } 262 } 263 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 264 hfs_mark_mdb_dirty(sb); 265 } 266 267 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, 268 __be32 __log_size, __be32 phys_size, u32 clump_size) 269 { 270 struct super_block *sb = inode->i_sb; 271 u32 log_size = be32_to_cpu(__log_size); 272 u16 count; 273 int i; 274 275 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); 276 for (count = 0, i = 0; i < 3; i++) 277 count += be16_to_cpu(ext[i].count); 278 HFS_I(inode)->first_blocks = count; 279 HFS_I(inode)->cached_start = 0; 280 HFS_I(inode)->cached_blocks = 0; 281 282 inode->i_size = HFS_I(inode)->phys_size = log_size; 283 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 284 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); 285 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / 286 HFS_SB(sb)->alloc_blksz; 287 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; 288 if (!HFS_I(inode)->clump_blocks) 289 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 290 } 291 292 struct hfs_iget_data { 293 struct hfs_cat_key *key; 294 hfs_cat_rec *rec; 295 }; 296 297 static int hfs_test_inode(struct inode *inode, void *data) 298 { 299 struct hfs_iget_data *idata = data; 300 hfs_cat_rec *rec; 301 302 rec = idata->rec; 303 switch (rec->type) { 304 case HFS_CDR_DIR: 305 return inode->i_ino == be32_to_cpu(rec->dir.DirID); 306 case HFS_CDR_FIL: 307 return inode->i_ino == be32_to_cpu(rec->file.FlNum); 308 default: 309 BUG(); 310 return 1; 311 } 312 } 313 314 /* 315 * hfs_read_inode 316 */ 317 static int hfs_read_inode(struct inode *inode, void *data) 318 { 319 struct hfs_iget_data *idata = data; 320 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 321 hfs_cat_rec *rec; 322 323 HFS_I(inode)->flags = 0; 324 HFS_I(inode)->rsrc_inode = NULL; 325 mutex_init(&HFS_I(inode)->extents_lock); 326 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); 327 spin_lock_init(&HFS_I(inode)->open_dir_lock); 328 329 /* Initialize the inode */ 330 inode->i_uid = hsb->s_uid; 331 inode->i_gid = hsb->s_gid; 332 set_nlink(inode, 1); 333 334 if (idata->key) 335 HFS_I(inode)->cat_key = *idata->key; 336 else 337 HFS_I(inode)->flags |= HFS_FLG_RSRC; 338 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; 339 340 rec = idata->rec; 341 switch (rec->type) { 342 case HFS_CDR_FIL: 343 if (!HFS_IS_RSRC(inode)) { 344 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, 345 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); 346 } else { 347 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, 348 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); 349 } 350 351 inode->i_ino = be32_to_cpu(rec->file.FlNum); 352 inode->i_mode = S_IRUGO | S_IXUGO; 353 if (!(rec->file.Flags & HFS_FIL_LOCK)) 354 inode->i_mode |= S_IWUGO; 355 inode->i_mode &= ~hsb->s_file_umask; 356 inode->i_mode |= S_IFREG; 357 inode_set_mtime_to_ts(inode, 358 inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, hfs_m_to_utime(rec->file.MdDat)))); 359 inode->i_op = &hfs_file_inode_operations; 360 inode->i_fop = &hfs_file_operations; 361 inode->i_mapping->a_ops = &hfs_aops; 362 break; 363 case HFS_CDR_DIR: 364 inode->i_ino = be32_to_cpu(rec->dir.DirID); 365 inode->i_size = be16_to_cpu(rec->dir.Val) + 2; 366 HFS_I(inode)->fs_blocks = 0; 367 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); 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->dir.MdDat)))); 370 inode->i_op = &hfs_dir_inode_operations; 371 inode->i_fop = &hfs_dir_operations; 372 break; 373 default: 374 make_bad_inode(inode); 375 } 376 return 0; 377 } 378 379 /* 380 * __hfs_iget() 381 * 382 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in 383 * the catalog B-tree and the 'type' of the desired file return the 384 * inode for that file/directory or NULL. Note that 'type' indicates 385 * whether we want the actual file or directory, or the corresponding 386 * metadata (AppleDouble header file or CAP metadata file). 387 */ 388 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) 389 { 390 struct hfs_iget_data data = { key, rec }; 391 struct inode *inode; 392 u32 cnid; 393 394 switch (rec->type) { 395 case HFS_CDR_DIR: 396 cnid = be32_to_cpu(rec->dir.DirID); 397 break; 398 case HFS_CDR_FIL: 399 cnid = be32_to_cpu(rec->file.FlNum); 400 break; 401 default: 402 return NULL; 403 } 404 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); 405 if (inode && (inode->i_state & I_NEW)) 406 unlock_new_inode(inode); 407 return inode; 408 } 409 410 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, 411 __be32 *log_size, __be32 *phys_size) 412 { 413 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); 414 415 if (log_size) 416 *log_size = cpu_to_be32(inode->i_size); 417 if (phys_size) 418 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * 419 HFS_SB(inode->i_sb)->alloc_blksz); 420 } 421 422 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc) 423 { 424 struct inode *main_inode = inode; 425 struct hfs_find_data fd; 426 hfs_cat_rec rec; 427 int res; 428 429 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino); 430 res = hfs_ext_write_extent(inode); 431 if (res) 432 return res; 433 434 if (inode->i_ino < HFS_FIRSTUSER_CNID) { 435 switch (inode->i_ino) { 436 case HFS_ROOT_CNID: 437 break; 438 case HFS_EXT_CNID: 439 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); 440 return 0; 441 case HFS_CAT_CNID: 442 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); 443 return 0; 444 default: 445 BUG(); 446 return -EIO; 447 } 448 } 449 450 if (HFS_IS_RSRC(inode)) 451 main_inode = HFS_I(inode)->rsrc_inode; 452 453 if (!main_inode->i_nlink) 454 return 0; 455 456 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) 457 /* panic? */ 458 return -EIO; 459 460 res = -EIO; 461 if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN) 462 goto out; 463 fd.search_key->cat = HFS_I(main_inode)->cat_key; 464 if (hfs_brec_find(&fd)) 465 goto out; 466 467 if (S_ISDIR(main_inode->i_mode)) { 468 if (fd.entrylength < sizeof(struct hfs_cat_dir)) 469 goto out; 470 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 471 sizeof(struct hfs_cat_dir)); 472 if (rec.type != HFS_CDR_DIR || 473 be32_to_cpu(rec.dir.DirID) != inode->i_ino) { 474 } 475 476 rec.dir.MdDat = hfs_u_to_mtime(inode_get_mtime(inode)); 477 rec.dir.Val = cpu_to_be16(inode->i_size - 2); 478 479 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 480 sizeof(struct hfs_cat_dir)); 481 } else if (HFS_IS_RSRC(inode)) { 482 if (fd.entrylength < sizeof(struct hfs_cat_file)) 483 goto out; 484 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 485 sizeof(struct hfs_cat_file)); 486 hfs_inode_write_fork(inode, rec.file.RExtRec, 487 &rec.file.RLgLen, &rec.file.RPyLen); 488 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 489 sizeof(struct hfs_cat_file)); 490 } else { 491 if (fd.entrylength < sizeof(struct hfs_cat_file)) 492 goto out; 493 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 494 sizeof(struct hfs_cat_file)); 495 if (rec.type != HFS_CDR_FIL || 496 be32_to_cpu(rec.file.FlNum) != inode->i_ino) { 497 } 498 499 if (inode->i_mode & S_IWUSR) 500 rec.file.Flags &= ~HFS_FIL_LOCK; 501 else 502 rec.file.Flags |= HFS_FIL_LOCK; 503 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); 504 rec.file.MdDat = hfs_u_to_mtime(inode_get_mtime(inode)); 505 506 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 507 sizeof(struct hfs_cat_file)); 508 } 509 res = 0; 510 out: 511 hfs_find_exit(&fd); 512 return res; 513 } 514 515 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, 516 unsigned int flags) 517 { 518 struct inode *inode = NULL; 519 hfs_cat_rec rec; 520 struct hfs_find_data fd; 521 int res; 522 523 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 524 goto out; 525 526 inode = HFS_I(dir)->rsrc_inode; 527 if (inode) 528 goto out; 529 530 inode = new_inode(dir->i_sb); 531 if (!inode) 532 return ERR_PTR(-ENOMEM); 533 534 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); 535 if (res) { 536 iput(inode); 537 return ERR_PTR(res); 538 } 539 fd.search_key->cat = HFS_I(dir)->cat_key; 540 res = hfs_brec_read(&fd, &rec, sizeof(rec)); 541 if (!res) { 542 struct hfs_iget_data idata = { NULL, &rec }; 543 hfs_read_inode(inode, &idata); 544 } 545 hfs_find_exit(&fd); 546 if (res) { 547 iput(inode); 548 return ERR_PTR(res); 549 } 550 HFS_I(inode)->rsrc_inode = dir; 551 HFS_I(dir)->rsrc_inode = inode; 552 igrab(dir); 553 inode_fake_hash(inode); 554 mark_inode_dirty(inode); 555 dont_mount(dentry); 556 out: 557 return d_splice_alias(inode, dentry); 558 } 559 560 void hfs_evict_inode(struct inode *inode) 561 { 562 truncate_inode_pages_final(&inode->i_data); 563 clear_inode(inode); 564 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { 565 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 566 iput(HFS_I(inode)->rsrc_inode); 567 } 568 } 569 570 static int hfs_file_open(struct inode *inode, struct file *file) 571 { 572 if (HFS_IS_RSRC(inode)) 573 inode = HFS_I(inode)->rsrc_inode; 574 atomic_inc(&HFS_I(inode)->opencnt); 575 return 0; 576 } 577 578 static int hfs_file_release(struct inode *inode, struct file *file) 579 { 580 //struct super_block *sb = inode->i_sb; 581 582 if (HFS_IS_RSRC(inode)) 583 inode = HFS_I(inode)->rsrc_inode; 584 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { 585 inode_lock(inode); 586 hfs_file_truncate(inode); 587 //if (inode->i_flags & S_DEAD) { 588 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 589 // hfs_delete_inode(inode); 590 //} 591 inode_unlock(inode); 592 } 593 return 0; 594 } 595 596 /* 597 * hfs_notify_change() 598 * 599 * Based very closely on fs/msdos/inode.c by Werner Almesberger 600 * 601 * This is the notify_change() field in the super_operations structure 602 * for HFS file systems. The purpose is to take that changes made to 603 * an inode and apply then in a filesystem-dependent manner. In this 604 * case the process has a few of tasks to do: 605 * 1) prevent changes to the i_uid and i_gid fields. 606 * 2) map file permissions to the closest allowable permissions 607 * 3) Since multiple Linux files can share the same on-disk inode under 608 * HFS (for instance the data and resource forks of a file) a change 609 * to permissions must be applied to all other in-core inodes which 610 * correspond to the same HFS file. 611 */ 612 613 int hfs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 614 struct iattr *attr) 615 { 616 struct inode *inode = d_inode(dentry); 617 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 618 int error; 619 620 error = setattr_prepare(&nop_mnt_idmap, dentry, 621 attr); /* basic permission checks */ 622 if (error) 623 return error; 624 625 /* no uig/gid changes and limit which mode bits can be set */ 626 if (((attr->ia_valid & ATTR_UID) && 627 (!uid_eq(attr->ia_uid, hsb->s_uid))) || 628 ((attr->ia_valid & ATTR_GID) && 629 (!gid_eq(attr->ia_gid, hsb->s_gid))) || 630 ((attr->ia_valid & ATTR_MODE) && 631 ((S_ISDIR(inode->i_mode) && 632 (attr->ia_mode != inode->i_mode)) || 633 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { 634 return hsb->s_quiet ? 0 : error; 635 } 636 637 if (attr->ia_valid & ATTR_MODE) { 638 /* Only the 'w' bits can ever change and only all together. */ 639 if (attr->ia_mode & S_IWUSR) 640 attr->ia_mode = inode->i_mode | S_IWUGO; 641 else 642 attr->ia_mode = inode->i_mode & ~S_IWUGO; 643 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; 644 } 645 646 if ((attr->ia_valid & ATTR_SIZE) && 647 attr->ia_size != i_size_read(inode)) { 648 inode_dio_wait(inode); 649 650 error = inode_newsize_ok(inode, attr->ia_size); 651 if (error) 652 return error; 653 654 truncate_setsize(inode, attr->ia_size); 655 hfs_file_truncate(inode); 656 simple_inode_init_ts(inode); 657 } 658 659 setattr_copy(&nop_mnt_idmap, inode, attr); 660 mark_inode_dirty(inode); 661 return 0; 662 } 663 664 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end, 665 int datasync) 666 { 667 struct inode *inode = filp->f_mapping->host; 668 struct super_block * sb; 669 int ret, err; 670 671 ret = file_write_and_wait_range(filp, start, end); 672 if (ret) 673 return ret; 674 inode_lock(inode); 675 676 /* sync the inode to buffers */ 677 ret = write_inode_now(inode, 0); 678 679 /* sync the superblock to buffers */ 680 sb = inode->i_sb; 681 flush_delayed_work(&HFS_SB(sb)->mdb_work); 682 /* .. finally sync the buffers to disk */ 683 err = sync_blockdev(sb->s_bdev); 684 if (!ret) 685 ret = err; 686 inode_unlock(inode); 687 return ret; 688 } 689 690 static const struct file_operations hfs_file_operations = { 691 .llseek = generic_file_llseek, 692 .read_iter = generic_file_read_iter, 693 .write_iter = generic_file_write_iter, 694 .mmap = generic_file_mmap, 695 .splice_read = filemap_splice_read, 696 .fsync = hfs_file_fsync, 697 .open = hfs_file_open, 698 .release = hfs_file_release, 699 }; 700 701 static const struct inode_operations hfs_file_inode_operations = { 702 .lookup = hfs_file_lookup, 703 .setattr = hfs_inode_setattr, 704 .listxattr = generic_listxattr, 705 }; 706