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