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 int err = -ENOMEM; 191 192 if (!inode) 193 goto out_err; 194 195 err = -ERANGE; 196 197 mutex_init(&HFS_I(inode)->extents_lock); 198 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); 199 spin_lock_init(&HFS_I(inode)->open_dir_lock); 200 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name); 201 next_id = atomic64_inc_return(&HFS_SB(sb)->next_id); 202 if (next_id > U32_MAX) { 203 atomic64_dec(&HFS_SB(sb)->next_id); 204 pr_err("cannot create new inode: next CNID exceeds limit\n"); 205 goto out_discard; 206 } 207 inode->i_ino = (u32)next_id; 208 inode->i_mode = mode; 209 inode->i_uid = current_fsuid(); 210 inode->i_gid = current_fsgid(); 211 set_nlink(inode, 1); 212 simple_inode_init_ts(inode); 213 HFS_I(inode)->flags = 0; 214 HFS_I(inode)->rsrc_inode = NULL; 215 HFS_I(inode)->fs_blocks = 0; 216 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; 217 if (S_ISDIR(mode)) { 218 inode->i_size = 2; 219 folder_count = atomic64_inc_return(&HFS_SB(sb)->folder_count); 220 if (folder_count> U32_MAX) { 221 atomic64_dec(&HFS_SB(sb)->folder_count); 222 pr_err("cannot create new inode: folder count exceeds limit\n"); 223 goto out_discard; 224 } 225 if (dir->i_ino == HFS_ROOT_CNID) 226 HFS_SB(sb)->root_dirs++; 227 inode->i_op = &hfs_dir_inode_operations; 228 inode->i_fop = &hfs_dir_operations; 229 inode->i_mode |= S_IRWXUGO; 230 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; 231 } else if (S_ISREG(mode)) { 232 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 233 file_count = atomic64_inc_return(&HFS_SB(sb)->file_count); 234 if (file_count > U32_MAX) { 235 atomic64_dec(&HFS_SB(sb)->file_count); 236 pr_err("cannot create new inode: file count exceeds limit\n"); 237 goto out_discard; 238 } 239 if (dir->i_ino == HFS_ROOT_CNID) 240 HFS_SB(sb)->root_files++; 241 inode->i_op = &hfs_file_inode_operations; 242 inode->i_fop = &hfs_file_operations; 243 inode->i_mapping->a_ops = &hfs_aops; 244 inode->i_mode |= S_IRUGO|S_IXUGO; 245 if (mode & S_IWUSR) 246 inode->i_mode |= S_IWUGO; 247 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; 248 HFS_I(inode)->phys_size = 0; 249 HFS_I(inode)->alloc_blocks = 0; 250 HFS_I(inode)->first_blocks = 0; 251 HFS_I(inode)->cached_start = 0; 252 HFS_I(inode)->cached_blocks = 0; 253 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); 254 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); 255 } 256 insert_inode_hash(inode); 257 mark_inode_dirty(inode); 258 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 259 hfs_mark_mdb_dirty(sb); 260 261 return inode; 262 263 out_discard: 264 iput(inode); 265 out_err: 266 return ERR_PTR(err); 267 } 268 269 void hfs_delete_inode(struct inode *inode) 270 { 271 struct super_block *sb = inode->i_sb; 272 273 hfs_dbg("ino %lu\n", inode->i_ino); 274 if (S_ISDIR(inode->i_mode)) { 275 atomic64_dec(&HFS_SB(sb)->folder_count); 276 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 277 HFS_SB(sb)->root_dirs--; 278 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 279 hfs_mark_mdb_dirty(sb); 280 return; 281 } 282 283 atomic64_dec(&HFS_SB(sb)->file_count); 284 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) 285 HFS_SB(sb)->root_files--; 286 if (S_ISREG(inode->i_mode)) { 287 if (!inode->i_nlink) { 288 inode->i_size = 0; 289 hfs_file_truncate(inode); 290 } 291 } 292 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); 293 hfs_mark_mdb_dirty(sb); 294 } 295 296 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, 297 __be32 __log_size, __be32 phys_size, u32 clump_size) 298 { 299 struct super_block *sb = inode->i_sb; 300 u32 log_size = be32_to_cpu(__log_size); 301 u16 count; 302 int i; 303 304 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); 305 for (count = 0, i = 0; i < 3; i++) 306 count += be16_to_cpu(ext[i].count); 307 HFS_I(inode)->first_blocks = count; 308 HFS_I(inode)->cached_start = 0; 309 HFS_I(inode)->cached_blocks = 0; 310 311 inode->i_size = HFS_I(inode)->phys_size = log_size; 312 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 313 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); 314 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / 315 HFS_SB(sb)->alloc_blksz; 316 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; 317 if (!HFS_I(inode)->clump_blocks) 318 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; 319 } 320 321 struct hfs_iget_data { 322 struct hfs_cat_key *key; 323 hfs_cat_rec *rec; 324 }; 325 326 static int hfs_test_inode(struct inode *inode, void *data) 327 { 328 struct hfs_iget_data *idata = data; 329 hfs_cat_rec *rec; 330 331 rec = idata->rec; 332 switch (rec->type) { 333 case HFS_CDR_DIR: 334 return inode->i_ino == be32_to_cpu(rec->dir.DirID); 335 case HFS_CDR_FIL: 336 return inode->i_ino == be32_to_cpu(rec->file.FlNum); 337 default: 338 BUG(); 339 return 1; 340 } 341 } 342 343 /* 344 * hfs_read_inode 345 */ 346 static int hfs_read_inode(struct inode *inode, void *data) 347 { 348 struct hfs_iget_data *idata = data; 349 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 350 hfs_cat_rec *rec; 351 352 HFS_I(inode)->flags = 0; 353 HFS_I(inode)->rsrc_inode = NULL; 354 mutex_init(&HFS_I(inode)->extents_lock); 355 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); 356 spin_lock_init(&HFS_I(inode)->open_dir_lock); 357 358 /* Initialize the inode */ 359 inode->i_uid = hsb->s_uid; 360 inode->i_gid = hsb->s_gid; 361 set_nlink(inode, 1); 362 363 if (idata->key) 364 HFS_I(inode)->cat_key = *idata->key; 365 else 366 HFS_I(inode)->flags |= HFS_FLG_RSRC; 367 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; 368 369 rec = idata->rec; 370 switch (rec->type) { 371 case HFS_CDR_FIL: 372 if (!HFS_IS_RSRC(inode)) { 373 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, 374 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); 375 } else { 376 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, 377 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); 378 } 379 380 inode->i_ino = be32_to_cpu(rec->file.FlNum); 381 inode->i_mode = S_IRUGO | S_IXUGO; 382 if (!(rec->file.Flags & HFS_FIL_LOCK)) 383 inode->i_mode |= S_IWUGO; 384 inode->i_mode &= ~hsb->s_file_umask; 385 inode->i_mode |= S_IFREG; 386 inode_set_mtime_to_ts(inode, 387 inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, hfs_m_to_utime(rec->file.MdDat)))); 388 inode->i_op = &hfs_file_inode_operations; 389 inode->i_fop = &hfs_file_operations; 390 inode->i_mapping->a_ops = &hfs_aops; 391 break; 392 case HFS_CDR_DIR: 393 inode->i_ino = be32_to_cpu(rec->dir.DirID); 394 inode->i_size = be16_to_cpu(rec->dir.Val) + 2; 395 HFS_I(inode)->fs_blocks = 0; 396 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); 397 inode_set_mtime_to_ts(inode, 398 inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, hfs_m_to_utime(rec->dir.MdDat)))); 399 inode->i_op = &hfs_dir_inode_operations; 400 inode->i_fop = &hfs_dir_operations; 401 break; 402 default: 403 make_bad_inode(inode); 404 } 405 return 0; 406 } 407 408 /* 409 * __hfs_iget() 410 * 411 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in 412 * the catalog B-tree and the 'type' of the desired file return the 413 * inode for that file/directory or NULL. Note that 'type' indicates 414 * whether we want the actual file or directory, or the corresponding 415 * metadata (AppleDouble header file or CAP metadata file). 416 */ 417 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) 418 { 419 struct hfs_iget_data data = { key, rec }; 420 struct inode *inode; 421 u32 cnid; 422 423 switch (rec->type) { 424 case HFS_CDR_DIR: 425 cnid = be32_to_cpu(rec->dir.DirID); 426 break; 427 case HFS_CDR_FIL: 428 cnid = be32_to_cpu(rec->file.FlNum); 429 break; 430 default: 431 return NULL; 432 } 433 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); 434 if (inode && (inode_state_read_once(inode) & I_NEW)) 435 unlock_new_inode(inode); 436 return inode; 437 } 438 439 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, 440 __be32 *log_size, __be32 *phys_size) 441 { 442 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); 443 444 if (log_size) 445 *log_size = cpu_to_be32(inode->i_size); 446 if (phys_size) 447 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * 448 HFS_SB(inode->i_sb)->alloc_blksz); 449 } 450 451 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc) 452 { 453 struct inode *main_inode = inode; 454 struct hfs_find_data fd; 455 hfs_cat_rec rec; 456 int res; 457 458 hfs_dbg("ino %lu\n", inode->i_ino); 459 res = hfs_ext_write_extent(inode); 460 if (res) 461 return res; 462 463 if (inode->i_ino < HFS_FIRSTUSER_CNID) { 464 switch (inode->i_ino) { 465 case HFS_ROOT_CNID: 466 break; 467 case HFS_EXT_CNID: 468 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); 469 return 0; 470 case HFS_CAT_CNID: 471 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); 472 return 0; 473 default: 474 BUG(); 475 return -EIO; 476 } 477 } 478 479 if (HFS_IS_RSRC(inode)) 480 main_inode = HFS_I(inode)->rsrc_inode; 481 482 if (!main_inode->i_nlink) 483 return 0; 484 485 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) 486 /* panic? */ 487 return -EIO; 488 489 res = -EIO; 490 if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN) 491 goto out; 492 fd.search_key->cat = HFS_I(main_inode)->cat_key; 493 if (hfs_brec_find(&fd)) 494 goto out; 495 496 if (S_ISDIR(main_inode->i_mode)) { 497 if (fd.entrylength < sizeof(struct hfs_cat_dir)) 498 goto out; 499 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 500 sizeof(struct hfs_cat_dir)); 501 if (rec.type != HFS_CDR_DIR || 502 be32_to_cpu(rec.dir.DirID) != inode->i_ino) { 503 } 504 505 rec.dir.MdDat = hfs_u_to_mtime(inode_get_mtime(inode)); 506 rec.dir.Val = cpu_to_be16(inode->i_size - 2); 507 508 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 509 sizeof(struct hfs_cat_dir)); 510 } else if (HFS_IS_RSRC(inode)) { 511 if (fd.entrylength < sizeof(struct hfs_cat_file)) 512 goto out; 513 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 514 sizeof(struct hfs_cat_file)); 515 hfs_inode_write_fork(inode, rec.file.RExtRec, 516 &rec.file.RLgLen, &rec.file.RPyLen); 517 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 518 sizeof(struct hfs_cat_file)); 519 } else { 520 if (fd.entrylength < sizeof(struct hfs_cat_file)) 521 goto out; 522 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, 523 sizeof(struct hfs_cat_file)); 524 if (rec.type != HFS_CDR_FIL || 525 be32_to_cpu(rec.file.FlNum) != inode->i_ino) { 526 } 527 528 if (inode->i_mode & S_IWUSR) 529 rec.file.Flags &= ~HFS_FIL_LOCK; 530 else 531 rec.file.Flags |= HFS_FIL_LOCK; 532 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); 533 rec.file.MdDat = hfs_u_to_mtime(inode_get_mtime(inode)); 534 535 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, 536 sizeof(struct hfs_cat_file)); 537 } 538 res = 0; 539 out: 540 hfs_find_exit(&fd); 541 return res; 542 } 543 544 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, 545 unsigned int flags) 546 { 547 struct inode *inode = NULL; 548 hfs_cat_rec rec; 549 struct hfs_find_data fd; 550 int res; 551 552 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 553 goto out; 554 555 inode = HFS_I(dir)->rsrc_inode; 556 if (inode) 557 goto out; 558 559 inode = new_inode(dir->i_sb); 560 if (!inode) 561 return ERR_PTR(-ENOMEM); 562 563 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); 564 if (res) { 565 iput(inode); 566 return ERR_PTR(res); 567 } 568 fd.search_key->cat = HFS_I(dir)->cat_key; 569 res = hfs_brec_read(&fd, &rec, sizeof(rec)); 570 if (!res) { 571 struct hfs_iget_data idata = { NULL, &rec }; 572 hfs_read_inode(inode, &idata); 573 } 574 hfs_find_exit(&fd); 575 if (res) { 576 iput(inode); 577 return ERR_PTR(res); 578 } 579 HFS_I(inode)->rsrc_inode = dir; 580 HFS_I(dir)->rsrc_inode = inode; 581 igrab(dir); 582 inode_fake_hash(inode); 583 mark_inode_dirty(inode); 584 dont_mount(dentry); 585 out: 586 return d_splice_alias(inode, dentry); 587 } 588 589 void hfs_evict_inode(struct inode *inode) 590 { 591 truncate_inode_pages_final(&inode->i_data); 592 clear_inode(inode); 593 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { 594 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 595 iput(HFS_I(inode)->rsrc_inode); 596 } 597 } 598 599 static int hfs_file_open(struct inode *inode, struct file *file) 600 { 601 if (HFS_IS_RSRC(inode)) 602 inode = HFS_I(inode)->rsrc_inode; 603 atomic_inc(&HFS_I(inode)->opencnt); 604 return 0; 605 } 606 607 static int hfs_file_release(struct inode *inode, struct file *file) 608 { 609 //struct super_block *sb = inode->i_sb; 610 611 if (HFS_IS_RSRC(inode)) 612 inode = HFS_I(inode)->rsrc_inode; 613 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { 614 inode_lock(inode); 615 hfs_file_truncate(inode); 616 //if (inode->i_flags & S_DEAD) { 617 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 618 // hfs_delete_inode(inode); 619 //} 620 inode_unlock(inode); 621 } 622 return 0; 623 } 624 625 /* 626 * hfs_notify_change() 627 * 628 * Based very closely on fs/msdos/inode.c by Werner Almesberger 629 * 630 * This is the notify_change() field in the super_operations structure 631 * for HFS file systems. The purpose is to take that changes made to 632 * an inode and apply then in a filesystem-dependent manner. In this 633 * case the process has a few of tasks to do: 634 * 1) prevent changes to the i_uid and i_gid fields. 635 * 2) map file permissions to the closest allowable permissions 636 * 3) Since multiple Linux files can share the same on-disk inode under 637 * HFS (for instance the data and resource forks of a file) a change 638 * to permissions must be applied to all other in-core inodes which 639 * correspond to the same HFS file. 640 */ 641 642 int hfs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 643 struct iattr *attr) 644 { 645 struct inode *inode = d_inode(dentry); 646 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); 647 int error; 648 649 error = setattr_prepare(&nop_mnt_idmap, dentry, 650 attr); /* basic permission checks */ 651 if (error) 652 return error; 653 654 /* no uig/gid changes and limit which mode bits can be set */ 655 if (((attr->ia_valid & ATTR_UID) && 656 (!uid_eq(attr->ia_uid, hsb->s_uid))) || 657 ((attr->ia_valid & ATTR_GID) && 658 (!gid_eq(attr->ia_gid, hsb->s_gid))) || 659 ((attr->ia_valid & ATTR_MODE) && 660 ((S_ISDIR(inode->i_mode) && 661 (attr->ia_mode != inode->i_mode)) || 662 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { 663 return hsb->s_quiet ? 0 : error; 664 } 665 666 if (attr->ia_valid & ATTR_MODE) { 667 /* Only the 'w' bits can ever change and only all together. */ 668 if (attr->ia_mode & S_IWUSR) 669 attr->ia_mode = inode->i_mode | S_IWUGO; 670 else 671 attr->ia_mode = inode->i_mode & ~S_IWUGO; 672 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; 673 } 674 675 if ((attr->ia_valid & ATTR_SIZE) && 676 attr->ia_size != i_size_read(inode)) { 677 inode_dio_wait(inode); 678 679 error = inode_newsize_ok(inode, attr->ia_size); 680 if (error) 681 return error; 682 683 truncate_setsize(inode, attr->ia_size); 684 hfs_file_truncate(inode); 685 simple_inode_init_ts(inode); 686 } 687 688 setattr_copy(&nop_mnt_idmap, inode, attr); 689 mark_inode_dirty(inode); 690 return 0; 691 } 692 693 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end, 694 int datasync) 695 { 696 struct inode *inode = filp->f_mapping->host; 697 struct super_block * sb; 698 int ret, err; 699 700 ret = file_write_and_wait_range(filp, start, end); 701 if (ret) 702 return ret; 703 inode_lock(inode); 704 705 /* sync the inode to buffers */ 706 ret = write_inode_now(inode, 0); 707 708 /* sync the superblock to buffers */ 709 sb = inode->i_sb; 710 flush_delayed_work(&HFS_SB(sb)->mdb_work); 711 /* .. finally sync the buffers to disk */ 712 err = sync_blockdev(sb->s_bdev); 713 if (!ret) 714 ret = err; 715 inode_unlock(inode); 716 return ret; 717 } 718 719 static const struct file_operations hfs_file_operations = { 720 .llseek = generic_file_llseek, 721 .read_iter = generic_file_read_iter, 722 .write_iter = generic_file_write_iter, 723 .mmap_prepare = generic_file_mmap_prepare, 724 .splice_read = filemap_splice_read, 725 .splice_write = iter_file_splice_write, 726 .fsync = hfs_file_fsync, 727 .open = hfs_file_open, 728 .release = hfs_file_release, 729 }; 730 731 static const struct inode_operations hfs_file_inode_operations = { 732 .lookup = hfs_file_lookup, 733 .setattr = hfs_inode_setattr, 734 .listxattr = generic_listxattr, 735 }; 736