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 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; 208 if (S_ISDIR(mode)) { 209 inode->i_size = 2; 210 HFS_SB(sb)->folder_count++; 211 if (dir->i_ino == HFS_ROOT_CNID) 212 HFS_SB(sb)->root_dirs++; 213 inode->i_op = &hfs_dir_inode_operations; 214 inode->i_fop = &hfs_dir_operations; 215 inode->i_mode |= S_IRWXUGO; 216 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; 217 } else if (S_ISREG(mode)) { 218 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 219 HFS_SB(sb)->file_count++; 220 if (dir->i_ino == HFS_ROOT_CNID) 221 HFS_SB(sb)->root_files++; 222 inode->i_op = &hfs_file_inode_operations; 223 inode->i_fop = &hfs_file_operations; 224 inode->i_mapping->a_ops = &hfs_aops; 225 inode->i_mode |= S_IRUGO|S_IXUGO; 226 if (mode & S_IWUSR) 227 inode->i_mode |= S_IWUGO; 228 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; 229 HFS_I(inode)->phys_size = 0; 230 HFS_I(inode)->alloc_blocks = 0; 231 HFS_I(inode)->first_blocks = 0; 232 HFS_I(inode)->cached_start = 0; 233 HFS_I(inode)->cached_blocks = 0; 234 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); 235 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); 236 } 237 insert_inode_hash(inode); 238 mark_inode_dirty(inode); 239 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 240 hfs_mark_mdb_dirty(sb); 241 242 return inode; 243 } 244 245 void hfs_delete_inode(struct inode *inode) 246 { 247 struct super_block *sb = inode->i_sb; 248 249 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino); 250 if (S_ISDIR(inode->i_mode)) { 251 HFS_SB(sb)->folder_count--; 252 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 253 HFS_SB(sb)->root_dirs--; 254 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 255 hfs_mark_mdb_dirty(sb); 256 return; 257 } 258 HFS_SB(sb)->file_count--; 259 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 260 HFS_SB(sb)->root_files--; 261 if (S_ISREG(inode->i_mode)) { 262 if (!inode->i_nlink) { 263 inode->i_size = 0; 264 hfs_file_truncate(inode); 265 } 266 } 267 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 268 hfs_mark_mdb_dirty(sb); 269 } 270 271 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, 272 __be32 __log_size, __be32 phys_size, u32 clump_size) 273 { 274 struct super_block *sb = inode->i_sb; 275 u32 log_size = be32_to_cpu(__log_size); 276 u16 count; 277 int i; 278 279 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); 280 for (count = 0, i = 0; i < 3; i++) 281 count += be16_to_cpu(ext[i].count); 282 HFS_I(inode)->first_blocks = count; 283 HFS_I(inode)->cached_start = 0; 284 HFS_I(inode)->cached_blocks = 0; 285 286 inode->i_size = HFS_I(inode)->phys_size = log_size; 287 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 288 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); 289 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / 290 HFS_SB(sb)->alloc_blksz; 291 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; 292 if (!HFS_I(inode)->clump_blocks) 293 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 294 } 295 296 struct hfs_iget_data { 297 struct hfs_cat_key *key; 298 hfs_cat_rec *rec; 299 }; 300 301 static int hfs_test_inode(struct inode *inode, void *data) 302 { 303 struct hfs_iget_data *idata = data; 304 hfs_cat_rec *rec; 305 306 rec = idata->rec; 307 switch (rec->type) { 308 case HFS_CDR_DIR: 309 return inode->i_ino == be32_to_cpu(rec->dir.DirID); 310 case HFS_CDR_FIL: 311 return inode->i_ino == be32_to_cpu(rec->file.FlNum); 312 default: 313 BUG(); 314 return 1; 315 } 316 } 317 318 /* 319 * hfs_read_inode 320 */ 321 static int hfs_read_inode(struct inode *inode, void *data) 322 { 323 struct hfs_iget_data *idata = data; 324 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 325 hfs_cat_rec *rec; 326 327 HFS_I(inode)->flags = 0; 328 HFS_I(inode)->rsrc_inode = NULL; 329 mutex_init(&HFS_I(inode)->extents_lock); 330 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); 331 spin_lock_init(&HFS_I(inode)->open_dir_lock); 332 333 /* Initialize the inode */ 334 inode->i_uid = hsb->s_uid; 335 inode->i_gid = hsb->s_gid; 336 set_nlink(inode, 1); 337 338 if (idata->key) 339 HFS_I(inode)->cat_key = *idata->key; 340 else 341 HFS_I(inode)->flags |= HFS_FLG_RSRC; 342 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; 343 344 rec = idata->rec; 345 switch (rec->type) { 346 case HFS_CDR_FIL: 347 if (!HFS_IS_RSRC(inode)) { 348 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, 349 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); 350 } else { 351 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, 352 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); 353 } 354 355 inode->i_ino = be32_to_cpu(rec->file.FlNum); 356 inode->i_mode = S_IRUGO | S_IXUGO; 357 if (!(rec->file.Flags & HFS_FIL_LOCK)) 358 inode->i_mode |= S_IWUGO; 359 inode->i_mode &= ~hsb->s_file_umask; 360 inode->i_mode |= S_IFREG; 361 inode->i_atime = inode->i_mtime = inode_set_ctime_to_ts(inode, 362 hfs_m_to_utime(rec->file.MdDat)); 363 inode->i_op = &hfs_file_inode_operations; 364 inode->i_fop = &hfs_file_operations; 365 inode->i_mapping->a_ops = &hfs_aops; 366 break; 367 case HFS_CDR_DIR: 368 inode->i_ino = be32_to_cpu(rec->dir.DirID); 369 inode->i_size = be16_to_cpu(rec->dir.Val) + 2; 370 HFS_I(inode)->fs_blocks = 0; 371 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); 372 inode->i_atime = inode->i_mtime = inode_set_ctime_to_ts(inode, 373 hfs_m_to_utime(rec->dir.MdDat)); 374 inode->i_op = &hfs_dir_inode_operations; 375 inode->i_fop = &hfs_dir_operations; 376 break; 377 default: 378 make_bad_inode(inode); 379 } 380 return 0; 381 } 382 383 /* 384 * __hfs_iget() 385 * 386 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in 387 * the catalog B-tree and the 'type' of the desired file return the 388 * inode for that file/directory or NULL. Note that 'type' indicates 389 * whether we want the actual file or directory, or the corresponding 390 * metadata (AppleDouble header file or CAP metadata file). 391 */ 392 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) 393 { 394 struct hfs_iget_data data = { key, rec }; 395 struct inode *inode; 396 u32 cnid; 397 398 switch (rec->type) { 399 case HFS_CDR_DIR: 400 cnid = be32_to_cpu(rec->dir.DirID); 401 break; 402 case HFS_CDR_FIL: 403 cnid = be32_to_cpu(rec->file.FlNum); 404 break; 405 default: 406 return NULL; 407 } 408 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); 409 if (inode && (inode->i_state & I_NEW)) 410 unlock_new_inode(inode); 411 return inode; 412 } 413 414 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, 415 __be32 *log_size, __be32 *phys_size) 416 { 417 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); 418 419 if (log_size) 420 *log_size = cpu_to_be32(inode->i_size); 421 if (phys_size) 422 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * 423 HFS_SB(inode->i_sb)->alloc_blksz); 424 } 425 426 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc) 427 { 428 struct inode *main_inode = inode; 429 struct hfs_find_data fd; 430 hfs_cat_rec rec; 431 int res; 432 433 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino); 434 res = hfs_ext_write_extent(inode); 435 if (res) 436 return res; 437 438 if (inode->i_ino < HFS_FIRSTUSER_CNID) { 439 switch (inode->i_ino) { 440 case HFS_ROOT_CNID: 441 break; 442 case HFS_EXT_CNID: 443 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); 444 return 0; 445 case HFS_CAT_CNID: 446 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); 447 return 0; 448 default: 449 BUG(); 450 return -EIO; 451 } 452 } 453 454 if (HFS_IS_RSRC(inode)) 455 main_inode = HFS_I(inode)->rsrc_inode; 456 457 if (!main_inode->i_nlink) 458 return 0; 459 460 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) 461 /* panic? */ 462 return -EIO; 463 464 res = -EIO; 465 if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN) 466 goto out; 467 fd.search_key->cat = HFS_I(main_inode)->cat_key; 468 if (hfs_brec_find(&fd)) 469 goto out; 470 471 if (S_ISDIR(main_inode->i_mode)) { 472 if (fd.entrylength < sizeof(struct hfs_cat_dir)) 473 goto out; 474 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 475 sizeof(struct hfs_cat_dir)); 476 if (rec.type != HFS_CDR_DIR || 477 be32_to_cpu(rec.dir.DirID) != inode->i_ino) { 478 } 479 480 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime); 481 rec.dir.Val = cpu_to_be16(inode->i_size - 2); 482 483 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 484 sizeof(struct hfs_cat_dir)); 485 } else if (HFS_IS_RSRC(inode)) { 486 if (fd.entrylength < sizeof(struct hfs_cat_file)) 487 goto out; 488 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 489 sizeof(struct hfs_cat_file)); 490 hfs_inode_write_fork(inode, rec.file.RExtRec, 491 &rec.file.RLgLen, &rec.file.RPyLen); 492 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 493 sizeof(struct hfs_cat_file)); 494 } else { 495 if (fd.entrylength < sizeof(struct hfs_cat_file)) 496 goto out; 497 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 498 sizeof(struct hfs_cat_file)); 499 if (rec.type != HFS_CDR_FIL || 500 be32_to_cpu(rec.file.FlNum) != inode->i_ino) { 501 } 502 503 if (inode->i_mode & S_IWUSR) 504 rec.file.Flags &= ~HFS_FIL_LOCK; 505 else 506 rec.file.Flags |= HFS_FIL_LOCK; 507 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); 508 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime); 509 510 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 511 sizeof(struct hfs_cat_file)); 512 } 513 res = 0; 514 out: 515 hfs_find_exit(&fd); 516 return res; 517 } 518 519 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, 520 unsigned int flags) 521 { 522 struct inode *inode = NULL; 523 hfs_cat_rec rec; 524 struct hfs_find_data fd; 525 int res; 526 527 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 528 goto out; 529 530 inode = HFS_I(dir)->rsrc_inode; 531 if (inode) 532 goto out; 533 534 inode = new_inode(dir->i_sb); 535 if (!inode) 536 return ERR_PTR(-ENOMEM); 537 538 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); 539 if (res) { 540 iput(inode); 541 return ERR_PTR(res); 542 } 543 fd.search_key->cat = HFS_I(dir)->cat_key; 544 res = hfs_brec_read(&fd, &rec, sizeof(rec)); 545 if (!res) { 546 struct hfs_iget_data idata = { NULL, &rec }; 547 hfs_read_inode(inode, &idata); 548 } 549 hfs_find_exit(&fd); 550 if (res) { 551 iput(inode); 552 return ERR_PTR(res); 553 } 554 HFS_I(inode)->rsrc_inode = dir; 555 HFS_I(dir)->rsrc_inode = inode; 556 igrab(dir); 557 inode_fake_hash(inode); 558 mark_inode_dirty(inode); 559 dont_mount(dentry); 560 out: 561 return d_splice_alias(inode, dentry); 562 } 563 564 void hfs_evict_inode(struct inode *inode) 565 { 566 truncate_inode_pages_final(&inode->i_data); 567 clear_inode(inode); 568 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { 569 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 570 iput(HFS_I(inode)->rsrc_inode); 571 } 572 } 573 574 static int hfs_file_open(struct inode *inode, struct file *file) 575 { 576 if (HFS_IS_RSRC(inode)) 577 inode = HFS_I(inode)->rsrc_inode; 578 atomic_inc(&HFS_I(inode)->opencnt); 579 return 0; 580 } 581 582 static int hfs_file_release(struct inode *inode, struct file *file) 583 { 584 //struct super_block *sb = inode->i_sb; 585 586 if (HFS_IS_RSRC(inode)) 587 inode = HFS_I(inode)->rsrc_inode; 588 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { 589 inode_lock(inode); 590 hfs_file_truncate(inode); 591 //if (inode->i_flags & S_DEAD) { 592 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 593 // hfs_delete_inode(inode); 594 //} 595 inode_unlock(inode); 596 } 597 return 0; 598 } 599 600 /* 601 * hfs_notify_change() 602 * 603 * Based very closely on fs/msdos/inode.c by Werner Almesberger 604 * 605 * This is the notify_change() field in the super_operations structure 606 * for HFS file systems. The purpose is to take that changes made to 607 * an inode and apply then in a filesystem-dependent manner. In this 608 * case the process has a few of tasks to do: 609 * 1) prevent changes to the i_uid and i_gid fields. 610 * 2) map file permissions to the closest allowable permissions 611 * 3) Since multiple Linux files can share the same on-disk inode under 612 * HFS (for instance the data and resource forks of a file) a change 613 * to permissions must be applied to all other in-core inodes which 614 * correspond to the same HFS file. 615 */ 616 617 int hfs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 618 struct iattr *attr) 619 { 620 struct inode *inode = d_inode(dentry); 621 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 622 int error; 623 624 error = setattr_prepare(&nop_mnt_idmap, dentry, 625 attr); /* basic permission checks */ 626 if (error) 627 return error; 628 629 /* no uig/gid changes and limit which mode bits can be set */ 630 if (((attr->ia_valid & ATTR_UID) && 631 (!uid_eq(attr->ia_uid, hsb->s_uid))) || 632 ((attr->ia_valid & ATTR_GID) && 633 (!gid_eq(attr->ia_gid, hsb->s_gid))) || 634 ((attr->ia_valid & ATTR_MODE) && 635 ((S_ISDIR(inode->i_mode) && 636 (attr->ia_mode != inode->i_mode)) || 637 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { 638 return hsb->s_quiet ? 0 : error; 639 } 640 641 if (attr->ia_valid & ATTR_MODE) { 642 /* Only the 'w' bits can ever change and only all together. */ 643 if (attr->ia_mode & S_IWUSR) 644 attr->ia_mode = inode->i_mode | S_IWUGO; 645 else 646 attr->ia_mode = inode->i_mode & ~S_IWUGO; 647 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; 648 } 649 650 if ((attr->ia_valid & ATTR_SIZE) && 651 attr->ia_size != i_size_read(inode)) { 652 inode_dio_wait(inode); 653 654 error = inode_newsize_ok(inode, attr->ia_size); 655 if (error) 656 return error; 657 658 truncate_setsize(inode, attr->ia_size); 659 hfs_file_truncate(inode); 660 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode); 661 } 662 663 setattr_copy(&nop_mnt_idmap, inode, attr); 664 mark_inode_dirty(inode); 665 return 0; 666 } 667 668 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end, 669 int datasync) 670 { 671 struct inode *inode = filp->f_mapping->host; 672 struct super_block * sb; 673 int ret, err; 674 675 ret = file_write_and_wait_range(filp, start, end); 676 if (ret) 677 return ret; 678 inode_lock(inode); 679 680 /* sync the inode to buffers */ 681 ret = write_inode_now(inode, 0); 682 683 /* sync the superblock to buffers */ 684 sb = inode->i_sb; 685 flush_delayed_work(&HFS_SB(sb)->mdb_work); 686 /* .. finally sync the buffers to disk */ 687 err = sync_blockdev(sb->s_bdev); 688 if (!ret) 689 ret = err; 690 inode_unlock(inode); 691 return ret; 692 } 693 694 static const struct file_operations hfs_file_operations = { 695 .llseek = generic_file_llseek, 696 .read_iter = generic_file_read_iter, 697 .write_iter = generic_file_write_iter, 698 .mmap = generic_file_mmap, 699 .splice_read = filemap_splice_read, 700 .fsync = hfs_file_fsync, 701 .open = hfs_file_open, 702 .release = hfs_file_release, 703 }; 704 705 static const struct inode_operations hfs_file_inode_operations = { 706 .lookup = hfs_file_lookup, 707 .setattr = hfs_inode_setattr, 708 .listxattr = generic_listxattr, 709 }; 710