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 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 };