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_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_readpage(struct file *file, struct page *page)
  38 {
  39         return block_read_full_page(page, 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 static int hfs_write_begin(struct file *file, struct address_space *mapping,
  53                         loff_t pos, unsigned len, unsigned flags,
  54                         struct page **pagep, void **fsdata)
  55 {
  56         int ret;
  57
  58         *pagep = NULL;
  59         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
  60                                 hfs_get_block,
  61                                 &HFS_I(mapping->host)->phys_size);
  62         if (unlikely(ret))
  63                 hfs_write_failed(mapping, pos + len);
  64
  65         return ret;
  66 }
  67
  68 static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
  69 {
  70         return generic_block_bmap(mapping, block, hfs_get_block);
  71 }
  72
  73 static int hfs_releasepage(struct page *page, gfp_t mask)
  74 {
  75         struct inode *inode = page->mapping->host;
  76         struct super_block *sb = inode->i_sb;
  77         struct hfs_btree *tree;
  78         struct hfs_bnode *node;
  79         u32 nidx;
  80         int i, res = 1;
  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 0;
  92         }
  93
  94         if (!tree)
  95                 return 0;
  96
  97         if (tree->node_size >= PAGE_SIZE) {
  98                 nidx = page->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 = 0;
 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 = page->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 = 0;
 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(page) : 0;
 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         .set_page_dirty = __set_page_dirty_buffers,
 163         .readpage       = hfs_readpage,
 164         .writepage      = hfs_writepage,
 165         .write_begin    = hfs_write_begin,
 166         .write_end      = generic_write_end,
 167         .bmap           = hfs_bmap,
 168         .releasepage    = hfs_releasepage,
 169 };
 170
 171 const struct address_space_operations hfs_aops = {
 172         .set_page_dirty = __set_page_dirty_buffers,
 173         .readpage       = hfs_readpage,
 174         .writepage      = hfs_writepage,
 175         .write_begin    = hfs_write_begin,
 176         .write_end      = generic_write_end,
 177         .bmap           = hfs_bmap,
 178         .direct_IO      = hfs_direct_IO,
 179         .writepages     = hfs_writepages,
 180 };
 181
 182 /*
 183  * hfs_new_inode
 184  */
 185 struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
 186 {
 187         struct super_block *sb = dir->i_sb;
 188         struct inode *inode = new_inode(sb);
 189         if (!inode)
 190                 return NULL;
 191
 192         mutex_init(&HFS_I(inode)->extents_lock);
 193         INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
 194         spin_lock_init(&HFS_I(inode)->open_dir_lock);
 195         hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
 196         inode->i_ino = HFS_SB(sb)->next_id++;
 197         inode->i_mode = mode;
 198         inode->i_uid = current_fsuid();
 199         inode->i_gid = current_fsgid();
 200         set_nlink(inode, 1);
 201         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 202         HFS_I(inode)->flags = 0;
 203         HFS_I(inode)->rsrc_inode = NULL;
 204         HFS_I(inode)->fs_blocks = 0;
 205         if (S_ISDIR(mode)) {
 206                 inode->i_size = 2;
 207                 HFS_SB(sb)->folder_count++;
 208                 if (dir->i_ino == HFS_ROOT_CNID)
 209                         HFS_SB(sb)->root_dirs++;
 210                 inode->i_op = &hfs_dir_inode_operations;
 211                 inode->i_fop = &hfs_dir_operations;
 212                 inode->i_mode |= S_IRWXUGO;
 213                 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
 214         } else if (S_ISREG(mode)) {
 215                 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
 216                 HFS_SB(sb)->file_count++;
 217                 if (dir->i_ino == HFS_ROOT_CNID)
 218                         HFS_SB(sb)->root_files++;
 219                 inode->i_op = &hfs_file_inode_operations;
 220                 inode->i_fop = &hfs_file_operations;
 221                 inode->i_mapping->a_ops = &hfs_aops;
 222                 inode->i_mode |= S_IRUGO|S_IXUGO;
 223                 if (mode & S_IWUSR)
 224                         inode->i_mode |= S_IWUGO;
 225                 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
 226                 HFS_I(inode)->phys_size = 0;
 227                 HFS_I(inode)->alloc_blocks = 0;
 228                 HFS_I(inode)->first_blocks = 0;
 229                 HFS_I(inode)->cached_start = 0;
 230                 HFS_I(inode)->cached_blocks = 0;
 231                 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
 232                 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
 233         }
 234         insert_inode_hash(inode);
 235         mark_inode_dirty(inode);
 236         set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
 237         hfs_mark_mdb_dirty(sb);
 238
 239         return inode;
 240 }
 241
 242 void hfs_delete_inode(struct inode *inode)
 243 {
 244         struct super_block *sb = inode->i_sb;
 245
 246         hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
 247         if (S_ISDIR(inode->i_mode)) {
 248                 HFS_SB(sb)->folder_count--;
 249                 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 250                         HFS_SB(sb)->root_dirs--;
 251                 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
 252                 hfs_mark_mdb_dirty(sb);
 253                 return;
 254         }
 255         HFS_SB(sb)->file_count--;
 256         if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 257                 HFS_SB(sb)->root_files--;
 258         if (S_ISREG(inode->i_mode)) {
 259                 if (!inode->i_nlink) {
 260                         inode->i_size = 0;
 261                         hfs_file_truncate(inode);
 262                 }
 263         }
 264         set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
 265         hfs_mark_mdb_dirty(sb);
 266 }
 267
 268 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
 269                          __be32 __log_size, __be32 phys_size, u32 clump_size)
 270 {
 271         struct super_block *sb = inode->i_sb;
 272         u32 log_size = be32_to_cpu(__log_size);
 273         u16 count;
 274         int i;
 275
 276         memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
 277         for (count = 0, i = 0; i < 3; i++)
 278                 count += be16_to_cpu(ext[i].count);
 279         HFS_I(inode)->first_blocks = count;
 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->i_ctime = inode->i_atime = inode->i_mtime =
 357                                 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->i_ctime = inode->i_atime = inode->i_mtime =
 368                                 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         fd.search_key->cat = HFS_I(main_inode)->cat_key;
 460         if (hfs_brec_find(&fd))
 461                 /* panic? */
 462                 goto out;
 463
 464         if (S_ISDIR(main_inode->i_mode)) {
 465                 WARN_ON(fd.entrylength < sizeof(struct hfs_cat_dir));
 466                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
 467                            sizeof(struct hfs_cat_dir));
 468                 if (rec.type != HFS_CDR_DIR ||
 469                     be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
 470                 }
 471
 472                 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
 473                 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
 474
 475                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
 476                             sizeof(struct hfs_cat_dir));
 477         } else if (HFS_IS_RSRC(inode)) {
 478                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
 479                                sizeof(struct hfs_cat_file));
 480                 hfs_inode_write_fork(inode, rec.file.RExtRec,
 481                                      &rec.file.RLgLen, &rec.file.RPyLen);
 482                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
 483                                 sizeof(struct hfs_cat_file));
 484         } else {
 485                 WARN_ON(fd.entrylength < sizeof(struct hfs_cat_file));
 486                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
 487                            sizeof(struct hfs_cat_file));
 488                 if (rec.type != HFS_CDR_FIL ||
 489                     be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
 490                 }
 491
 492                 if (inode->i_mode & S_IWUSR)
 493                         rec.file.Flags &= ~HFS_FIL_LOCK;
 494                 else
 495                         rec.file.Flags |= HFS_FIL_LOCK;
 496                 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
 497                 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
 498
 499                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
 500                             sizeof(struct hfs_cat_file));
 501         }
 502 out:
 503         hfs_find_exit(&fd);
 504         return 0;
 505 }
 506
 507 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
 508                                       unsigned int flags)
 509 {
 510         struct inode *inode = NULL;
 511         hfs_cat_rec rec;
 512         struct hfs_find_data fd;
 513         int res;
 514
 515         if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
 516                 goto out;
 517
 518         inode = HFS_I(dir)->rsrc_inode;
 519         if (inode)
 520                 goto out;
 521
 522         inode = new_inode(dir->i_sb);
 523         if (!inode)
 524                 return ERR_PTR(-ENOMEM);
 525
 526         res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
 527         if (res) {
 528                 iput(inode);
 529                 return ERR_PTR(res);
 530         }
 531         fd.search_key->cat = HFS_I(dir)->cat_key;
 532         res = hfs_brec_read(&fd, &rec, sizeof(rec));
 533         if (!res) {
 534                 struct hfs_iget_data idata = { NULL, &rec };
 535                 hfs_read_inode(inode, &idata);
 536         }
 537         hfs_find_exit(&fd);
 538         if (res) {
 539                 iput(inode);
 540                 return ERR_PTR(res);
 541         }
 542         HFS_I(inode)->rsrc_inode = dir;
 543         HFS_I(dir)->rsrc_inode = inode;
 544         igrab(dir);
 545         inode_fake_hash(inode);
 546         mark_inode_dirty(inode);
 547         dont_mount(dentry);
 548 out:
 549         return d_splice_alias(inode, dentry);
 550 }
 551
 552 void hfs_evict_inode(struct inode *inode)
 553 {
 554         truncate_inode_pages_final(&inode->i_data);
 555         clear_inode(inode);
 556         if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
 557                 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 558                 iput(HFS_I(inode)->rsrc_inode);
 559         }
 560 }
 561
 562 static int hfs_file_open(struct inode *inode, struct file *file)
 563 {
 564         if (HFS_IS_RSRC(inode))
 565                 inode = HFS_I(inode)->rsrc_inode;
 566         atomic_inc(&HFS_I(inode)->opencnt);
 567         return 0;
 568 }
 569
 570 static int hfs_file_release(struct inode *inode, struct file *file)
 571 {
 572         //struct super_block *sb = inode->i_sb;
 573
 574         if (HFS_IS_RSRC(inode))
 575                 inode = HFS_I(inode)->rsrc_inode;
 576         if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
 577                 inode_lock(inode);
 578                 hfs_file_truncate(inode);
 579                 //if (inode->i_flags & S_DEAD) {
 580                 //      hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
 581                 //      hfs_delete_inode(inode);
 582                 //}
 583                 inode_unlock(inode);
 584         }
 585         return 0;
 586 }
 587
 588 /*
 589  * hfs_notify_change()
 590  *
 591  * Based very closely on fs/msdos/inode.c by Werner Almesberger
 592  *
 593  * This is the notify_change() field in the super_operations structure
 594  * for HFS file systems.  The purpose is to take that changes made to
 595  * an inode and apply then in a filesystem-dependent manner.  In this
 596  * case the process has a few of tasks to do:
 597  *  1) prevent changes to the i_uid and i_gid fields.
 598  *  2) map file permissions to the closest allowable permissions
 599  *  3) Since multiple Linux files can share the same on-disk inode under
 600  *     HFS (for instance the data and resource forks of a file) a change
 601  *     to permissions must be applied to all other in-core inodes which
 602  *     correspond to the same HFS file.
 603  */
 604
 605 int hfs_inode_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 606                       struct iattr *attr)
 607 {
 608         struct inode *inode = d_inode(dentry);
 609         struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
 610         int error;
 611
 612         error = setattr_prepare(&init_user_ns, dentry,
 613                                 attr); /* basic permission checks */
 614         if (error)
 615                 return error;
 616
 617         /* no uig/gid changes and limit which mode bits can be set */
 618         if (((attr->ia_valid & ATTR_UID) &&
 619              (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
 620             ((attr->ia_valid & ATTR_GID) &&
 621              (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
 622             ((attr->ia_valid & ATTR_MODE) &&
 623              ((S_ISDIR(inode->i_mode) &&
 624                (attr->ia_mode != inode->i_mode)) ||
 625               (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
 626                 return hsb->s_quiet ? 0 : error;
 627         }
 628
 629         if (attr->ia_valid & ATTR_MODE) {
 630                 /* Only the 'w' bits can ever change and only all together. */
 631                 if (attr->ia_mode & S_IWUSR)
 632                         attr->ia_mode = inode->i_mode | S_IWUGO;
 633                 else
 634                         attr->ia_mode = inode->i_mode & ~S_IWUGO;
 635                 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
 636         }
 637
 638         if ((attr->ia_valid & ATTR_SIZE) &&
 639             attr->ia_size != i_size_read(inode)) {
 640                 inode_dio_wait(inode);
 641
 642                 error = inode_newsize_ok(inode, attr->ia_size);
 643                 if (error)
 644                         return error;
 645
 646                 truncate_setsize(inode, attr->ia_size);
 647                 hfs_file_truncate(inode);
 648                 inode->i_atime = inode->i_mtime = inode->i_ctime =
 649                                                   current_time(inode);
 650         }
 651
 652         setattr_copy(&init_user_ns, inode, attr);
 653         mark_inode_dirty(inode);
 654         return 0;
 655 }
 656
 657 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
 658                           int datasync)
 659 {
 660         struct inode *inode = filp->f_mapping->host;
 661         struct super_block * sb;
 662         int ret, err;
 663
 664         ret = file_write_and_wait_range(filp, start, end);
 665         if (ret)
 666                 return ret;
 667         inode_lock(inode);
 668
 669         /* sync the inode to buffers */
 670         ret = write_inode_now(inode, 0);
 671
 672         /* sync the superblock to buffers */
 673         sb = inode->i_sb;
 674         flush_delayed_work(&HFS_SB(sb)->mdb_work);
 675         /* .. finally sync the buffers to disk */
 676         err = sync_blockdev(sb->s_bdev);
 677         if (!ret)
 678                 ret = err;
 679         inode_unlock(inode);
 680         return ret;
 681 }
 682
 683 static const struct file_operations hfs_file_operations = {
 684         .llseek         = generic_file_llseek,
 685         .read_iter      = generic_file_read_iter,
 686         .write_iter     = generic_file_write_iter,
 687         .mmap           = generic_file_mmap,
 688         .splice_read    = generic_file_splice_read,
 689         .fsync          = hfs_file_fsync,
 690         .open           = hfs_file_open,
 691         .release        = hfs_file_release,
 692 };
 693
 694 static const struct inode_operations hfs_file_inode_operations = {
 695         .lookup         = hfs_file_lookup,
 696         .setattr        = hfs_inode_setattr,
 697         .listxattr      = generic_listxattr,
 698 };