fs/hfs/inode.c

   1 /*
   2  *  linux/fs/hfs/inode.c
   3  *
   4  * Copyright (C) 1995-1997  Paul H. Hargrove
   5  * (C) 2003 Ardis Technologies <[email protected]>
   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 };