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/uio.h>
  18 #include <linux/xattr.h>
  19
  20 #include "hfs_fs.h"
  21 #include "btree.h"
  22
  23 static const struct file_operations hfs_file_operations;
  24 static const struct inode_operations hfs_file_inode_operations;
  25
  26 /*================ Variable-like macros ================*/
  27
  28 #define HFS_VALID_MODE_BITS  (S_IFREG | S_IFDIR | S_IRWXUGO)
  29
  30 static int hfs_writepage(struct page *page, struct writeback_control *wbc)
  31 {
  32         return block_write_full_page(page, hfs_get_block, wbc);
  33 }
  34
  35 static int hfs_readpage(struct file *file, struct page *page)
  36 {
  37         return block_read_full_page(page, hfs_get_block);
  38 }
  39
  40 static void hfs_write_failed(struct address_space *mapping, loff_t to)
  41 {
  42         struct inode *inode = mapping->host;
  43
  44         if (to > inode->i_size) {
  45                 truncate_pagecache(inode, inode->i_size);
  46                 hfs_file_truncate(inode);
  47         }
  48 }
  49
  50 static int hfs_write_begin(struct file *file, struct address_space *mapping,
  51                         loff_t pos, unsigned len, unsigned flags,
  52                         struct page **pagep, void **fsdata)
  53 {
  54         int ret;
  55
  56         *pagep = NULL;
  57         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
  58                                 hfs_get_block,
  59                                 &HFS_I(mapping->host)->phys_size);
  60         if (unlikely(ret))
  61                 hfs_write_failed(mapping, pos + len);
  62
  63         return ret;
  64 }
  65
  66 static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
  67 {
  68         return generic_block_bmap(mapping, block, hfs_get_block);
  69 }
  70
  71 static int hfs_releasepage(struct page *page, gfp_t mask)
  72 {
  73         struct inode *inode = page->mapping->host;
  74         struct super_block *sb = inode->i_sb;
  75         struct hfs_btree *tree;
  76         struct hfs_bnode *node;
  77         u32 nidx;
  78         int i, res = 1;
  79
  80         switch (inode->i_ino) {
  81         case HFS_EXT_CNID:
  82                 tree = HFS_SB(sb)->ext_tree;
  83                 break;
  84         case HFS_CAT_CNID:
  85                 tree = HFS_SB(sb)->cat_tree;
  86                 break;
  87         default:
  88                 BUG();
  89                 return 0;
  90         }
  91
  92         if (!tree)
  93                 return 0;
  94
  95         if (tree->node_size >= PAGE_SIZE) {
  96                 nidx = page->index >> (tree->node_size_shift - PAGE_SHIFT);
  97                 spin_lock(&tree->hash_lock);
  98                 node = hfs_bnode_findhash(tree, nidx);
  99                 if (!node)
 100                         ;
 101                 else if (atomic_read(&node->refcnt))
 102                         res = 0;
 103                 if (res && node) {
 104                         hfs_bnode_unhash(node);
 105                         hfs_bnode_free(node);
 106                 }
 107                 spin_unlock(&tree->hash_lock);
 108         } else {
 109                 nidx = page->index << (PAGE_SHIFT - tree->node_size_shift);
 110                 i = 1 << (PAGE_SHIFT - tree->node_size_shift);
 111                 spin_lock(&tree->hash_lock);
 112                 do {
 113                         node = hfs_bnode_findhash(tree, nidx++);
 114                         if (!node)
 115                                 continue;
 116                         if (atomic_read(&node->refcnt)) {
 117                                 res = 0;
 118                                 break;
 119                         }
 120                         hfs_bnode_unhash(node);
 121                         hfs_bnode_free(node);
 122                 } while (--i && nidx < tree->node_count);
 123                 spin_unlock(&tree->hash_lock);
 124         }
 125         return res ? try_to_free_buffers(page) : 0;
 126 }
 127
 128 static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 129 {
 130         struct file *file = iocb->ki_filp;
 131         struct address_space *mapping = file->f_mapping;
 132         struct inode *inode = mapping->host;
 133         size_t count = iov_iter_count(iter);
 134         ssize_t ret;
 135
 136         ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
 137
 138         /*
 139          * In case of error extending write may have instantiated a few
 140          * blocks outside i_size. Trim these off again.
 141          */
 142         if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
 143                 loff_t isize = i_size_read(inode);
 144                 loff_t end = iocb->ki_pos + count;
 145
 146                 if (end > isize)
 147                         hfs_write_failed(mapping, end);
 148         }
 149
 150         return ret;
 151 }
 152
 153 static int hfs_writepages(struct address_space *mapping,
 154                           struct writeback_control *wbc)
 155 {
 156         return mpage_writepages(mapping, wbc, hfs_get_block);
 157 }
 158
 159 const struct address_space_operations hfs_btree_aops = {
 160         .readpage       = hfs_readpage,
 161         .writepage      = hfs_writepage,
 162         .write_begin    = hfs_write_begin,
 163         .write_end      = generic_write_end,
 164         .bmap           = hfs_bmap,
 165         .releasepage    = hfs_releasepage,
 166 };
 167
 168 const struct address_space_operations hfs_aops = {
 169         .readpage       = hfs_readpage,
 170         .writepage      = hfs_writepage,
 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 };
 177
 178 /*
 179  * hfs_new_inode
 180  */
 181 struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
 182 {
 183         struct super_block *sb = dir->i_sb;
 184         struct inode *inode = new_inode(sb);
 185         if (!inode)
 186                 return NULL;
 187
 188         mutex_init(&HFS_I(inode)->extents_lock);
 189         INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
 190         spin_lock_init(&HFS_I(inode)->open_dir_lock);
 191         hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
 192         inode->i_ino = HFS_SB(sb)->next_id++;
 193         inode->i_mode = mode;
 194         inode->i_uid = current_fsuid();
 195         inode->i_gid = current_fsgid();
 196         set_nlink(inode, 1);
 197         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 198         HFS_I(inode)->flags = 0;
 199         HFS_I(inode)->rsrc_inode = NULL;
 200         HFS_I(inode)->fs_blocks = 0;
 201         if (S_ISDIR(mode)) {
 202                 inode->i_size = 2;
 203                 HFS_SB(sb)->folder_count++;
 204                 if (dir->i_ino == HFS_ROOT_CNID)
 205                         HFS_SB(sb)->root_dirs++;
 206                 inode->i_op = &hfs_dir_inode_operations;
 207                 inode->i_fop = &hfs_dir_operations;
 208                 inode->i_mode |= S_IRWXUGO;
 209                 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
 210         } else if (S_ISREG(mode)) {
 211                 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
 212                 HFS_SB(sb)->file_count++;
 213                 if (dir->i_ino == HFS_ROOT_CNID)
 214                         HFS_SB(sb)->root_files++;
 215                 inode->i_op = &hfs_file_inode_operations;
 216                 inode->i_fop = &hfs_file_operations;
 217                 inode->i_mapping->a_ops = &hfs_aops;
 218                 inode->i_mode |= S_IRUGO|S_IXUGO;
 219                 if (mode & S_IWUSR)
 220                         inode->i_mode |= S_IWUGO;
 221                 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
 222                 HFS_I(inode)->phys_size = 0;
 223                 HFS_I(inode)->alloc_blocks = 0;
 224                 HFS_I(inode)->first_blocks = 0;
 225                 HFS_I(inode)->cached_start = 0;
 226                 HFS_I(inode)->cached_blocks = 0;
 227                 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
 228                 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
 229         }
 230         insert_inode_hash(inode);
 231         mark_inode_dirty(inode);
 232         set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
 233         hfs_mark_mdb_dirty(sb);
 234
 235         return inode;
 236 }
 237
 238 void hfs_delete_inode(struct inode *inode)
 239 {
 240         struct super_block *sb = inode->i_sb;
 241
 242         hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
 243         if (S_ISDIR(inode->i_mode)) {
 244                 HFS_SB(sb)->folder_count--;
 245                 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 246                         HFS_SB(sb)->root_dirs--;
 247                 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
 248                 hfs_mark_mdb_dirty(sb);
 249                 return;
 250         }
 251         HFS_SB(sb)->file_count--;
 252         if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 253                 HFS_SB(sb)->root_files--;
 254         if (S_ISREG(inode->i_mode)) {
 255                 if (!inode->i_nlink) {
 256                         inode->i_size = 0;
 257                         hfs_file_truncate(inode);
 258                 }
 259         }
 260         set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
 261         hfs_mark_mdb_dirty(sb);
 262 }
 263
 264 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
 265                          __be32 __log_size, __be32 phys_size, u32 clump_size)
 266 {
 267         struct super_block *sb = inode->i_sb;
 268         u32 log_size = be32_to_cpu(__log_size);
 269         u16 count;
 270         int i;
 271
 272         memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
 273         for (count = 0, i = 0; i < 3; i++)
 274                 count += be16_to_cpu(ext[i].count);
 275         HFS_I(inode)->first_blocks = count;
 276
 277         inode->i_size = HFS_I(inode)->phys_size = log_size;
 278         HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
 279         inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
 280         HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
 281                                      HFS_SB(sb)->alloc_blksz;
 282         HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
 283         if (!HFS_I(inode)->clump_blocks)
 284                 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
 285 }
 286
 287 struct hfs_iget_data {
 288         struct hfs_cat_key *key;
 289         hfs_cat_rec *rec;
 290 };
 291
 292 static int hfs_test_inode(struct inode *inode, void *data)
 293 {
 294         struct hfs_iget_data *idata = data;
 295         hfs_cat_rec *rec;
 296
 297         rec = idata->rec;
 298         switch (rec->type) {
 299         case HFS_CDR_DIR:
 300                 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
 301         case HFS_CDR_FIL:
 302                 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
 303         default:
 304                 BUG();
 305                 return 1;
 306         }
 307 }
 308
 309 /*
 310  * hfs_read_inode
 311  */
 312 static int hfs_read_inode(struct inode *inode, void *data)
 313 {
 314         struct hfs_iget_data *idata = data;
 315         struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
 316         hfs_cat_rec *rec;
 317
 318         HFS_I(inode)->flags = 0;
 319         HFS_I(inode)->rsrc_inode = NULL;
 320         mutex_init(&HFS_I(inode)->extents_lock);
 321         INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
 322         spin_lock_init(&HFS_I(inode)->open_dir_lock);
 323
 324         /* Initialize the inode */
 325         inode->i_uid = hsb->s_uid;
 326         inode->i_gid = hsb->s_gid;
 327         set_nlink(inode, 1);
 328
 329         if (idata->key)
 330                 HFS_I(inode)->cat_key = *idata->key;
 331         else
 332                 HFS_I(inode)->flags |= HFS_FLG_RSRC;
 333         HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
 334
 335         rec = idata->rec;
 336         switch (rec->type) {
 337         case HFS_CDR_FIL:
 338                 if (!HFS_IS_RSRC(inode)) {
 339                         hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
 340                                             rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
 341                 } else {
 342                         hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
 343                                             rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
 344                 }
 345
 346                 inode->i_ino = be32_to_cpu(rec->file.FlNum);
 347                 inode->i_mode = S_IRUGO | S_IXUGO;
 348                 if (!(rec->file.Flags & HFS_FIL_LOCK))
 349                         inode->i_mode |= S_IWUGO;
 350                 inode->i_mode &= ~hsb->s_file_umask;
 351                 inode->i_mode |= S_IFREG;
 352                 inode->i_ctime = inode->i_atime = inode->i_mtime =
 353                                 hfs_m_to_utime(rec->file.MdDat);
 354                 inode->i_op = &hfs_file_inode_operations;
 355                 inode->i_fop = &hfs_file_operations;
 356                 inode->i_mapping->a_ops = &hfs_aops;
 357                 break;
 358         case HFS_CDR_DIR:
 359                 inode->i_ino = be32_to_cpu(rec->dir.DirID);
 360                 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
 361                 HFS_I(inode)->fs_blocks = 0;
 362                 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
 363                 inode->i_ctime = inode->i_atime = inode->i_mtime =
 364                                 hfs_m_to_utime(rec->dir.MdDat);
 365                 inode->i_op = &hfs_dir_inode_operations;
 366                 inode->i_fop = &hfs_dir_operations;
 367                 break;
 368         default:
 369                 make_bad_inode(inode);
 370         }
 371         return 0;
 372 }
 373
 374 /*
 375  * __hfs_iget()
 376  *
 377  * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
 378  * the catalog B-tree and the 'type' of the desired file return the
 379  * inode for that file/directory or NULL.  Note that 'type' indicates
 380  * whether we want the actual file or directory, or the corresponding
 381  * metadata (AppleDouble header file or CAP metadata file).
 382  */
 383 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
 384 {
 385         struct hfs_iget_data data = { key, rec };
 386         struct inode *inode;
 387         u32 cnid;
 388
 389         switch (rec->type) {
 390         case HFS_CDR_DIR:
 391                 cnid = be32_to_cpu(rec->dir.DirID);
 392                 break;
 393         case HFS_CDR_FIL:
 394                 cnid = be32_to_cpu(rec->file.FlNum);
 395                 break;
 396         default:
 397                 return NULL;
 398         }
 399         inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
 400         if (inode && (inode->i_state & I_NEW))
 401                 unlock_new_inode(inode);
 402         return inode;
 403 }
 404
 405 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
 406                           __be32 *log_size, __be32 *phys_size)
 407 {
 408         memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
 409
 410         if (log_size)
 411                 *log_size = cpu_to_be32(inode->i_size);
 412         if (phys_size)
 413                 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
 414                                          HFS_SB(inode->i_sb)->alloc_blksz);
 415 }
 416
 417 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
 418 {
 419         struct inode *main_inode = inode;
 420         struct hfs_find_data fd;
 421         hfs_cat_rec rec;
 422         int res;
 423
 424         hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
 425         res = hfs_ext_write_extent(inode);
 426         if (res)
 427                 return res;
 428
 429         if (inode->i_ino < HFS_FIRSTUSER_CNID) {
 430                 switch (inode->i_ino) {
 431                 case HFS_ROOT_CNID:
 432                         break;
 433                 case HFS_EXT_CNID:
 434                         hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
 435                         return 0;
 436                 case HFS_CAT_CNID:
 437                         hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
 438                         return 0;
 439                 default:
 440                         BUG();
 441                         return -EIO;
 442                 }
 443         }
 444
 445         if (HFS_IS_RSRC(inode))
 446                 main_inode = HFS_I(inode)->rsrc_inode;
 447
 448         if (!main_inode->i_nlink)
 449                 return 0;
 450
 451         if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
 452                 /* panic? */
 453                 return -EIO;
 454
 455         fd.search_key->cat = HFS_I(main_inode)->cat_key;
 456         if (hfs_brec_find(&fd))
 457                 /* panic? */
 458                 goto out;
 459
 460         if (S_ISDIR(main_inode->i_mode)) {
 461                 if (fd.entrylength < sizeof(struct hfs_cat_dir))
 462                         /* panic? */;
 463                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
 464                            sizeof(struct hfs_cat_dir));
 465                 if (rec.type != HFS_CDR_DIR ||
 466                     be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
 467                 }
 468
 469                 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
 470                 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
 471
 472                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
 473                             sizeof(struct hfs_cat_dir));
 474         } else if (HFS_IS_RSRC(inode)) {
 475                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
 476                                sizeof(struct hfs_cat_file));
 477                 hfs_inode_write_fork(inode, rec.file.RExtRec,
 478                                      &rec.file.RLgLen, &rec.file.RPyLen);
 479                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
 480                                 sizeof(struct hfs_cat_file));
 481         } else {
 482                 if (fd.entrylength < sizeof(struct hfs_cat_file))
 483                         /* panic? */;
 484                 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
 485                            sizeof(struct hfs_cat_file));
 486                 if (rec.type != HFS_CDR_FIL ||
 487                     be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
 488                 }
 489
 490                 if (inode->i_mode & S_IWUSR)
 491                         rec.file.Flags &= ~HFS_FIL_LOCK;
 492                 else
 493                         rec.file.Flags |= HFS_FIL_LOCK;
 494                 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
 495                 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
 496
 497                 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
 498                             sizeof(struct hfs_cat_file));
 499         }
 500 out:
 501         hfs_find_exit(&fd);
 502         return 0;
 503 }
 504
 505 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
 506                                       unsigned int flags)
 507 {
 508         struct inode *inode = NULL;
 509         hfs_cat_rec rec;
 510         struct hfs_find_data fd;
 511         int res;
 512
 513         if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
 514                 goto out;
 515
 516         inode = HFS_I(dir)->rsrc_inode;
 517         if (inode)
 518                 goto out;
 519
 520         inode = new_inode(dir->i_sb);
 521         if (!inode)
 522                 return ERR_PTR(-ENOMEM);
 523
 524         res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
 525         if (res) {
 526                 iput(inode);
 527                 return ERR_PTR(res);
 528         }
 529         fd.search_key->cat = HFS_I(dir)->cat_key;
 530         res = hfs_brec_read(&fd, &rec, sizeof(rec));
 531         if (!res) {
 532                 struct hfs_iget_data idata = { NULL, &rec };
 533                 hfs_read_inode(inode, &idata);
 534         }
 535         hfs_find_exit(&fd);
 536         if (res) {
 537                 iput(inode);
 538                 return ERR_PTR(res);
 539         }
 540         HFS_I(inode)->rsrc_inode = dir;
 541         HFS_I(dir)->rsrc_inode = inode;
 542         igrab(dir);
 543         hlist_add_fake(&inode->i_hash);
 544         mark_inode_dirty(inode);
 545 out:
 546         d_add(dentry, inode);
 547         return NULL;
 548 }
 549
 550 void hfs_evict_inode(struct inode *inode)
 551 {
 552         truncate_inode_pages_final(&inode->i_data);
 553         clear_inode(inode);
 554         if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
 555                 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 556                 iput(HFS_I(inode)->rsrc_inode);
 557         }
 558 }
 559
 560 static int hfs_file_open(struct inode *inode, struct file *file)
 561 {
 562         if (HFS_IS_RSRC(inode))
 563                 inode = HFS_I(inode)->rsrc_inode;
 564         atomic_inc(&HFS_I(inode)->opencnt);
 565         return 0;
 566 }
 567
 568 static int hfs_file_release(struct inode *inode, struct file *file)
 569 {
 570         //struct super_block *sb = inode->i_sb;
 571
 572         if (HFS_IS_RSRC(inode))
 573                 inode = HFS_I(inode)->rsrc_inode;
 574         if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
 575                 inode_lock(inode);
 576                 hfs_file_truncate(inode);
 577                 //if (inode->i_flags & S_DEAD) {
 578                 //      hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
 579                 //      hfs_delete_inode(inode);
 580                 //}
 581                 inode_unlock(inode);
 582         }
 583         return 0;
 584 }
 585
 586 /*
 587  * hfs_notify_change()
 588  *
 589  * Based very closely on fs/msdos/inode.c by Werner Almesberger
 590  *
 591  * This is the notify_change() field in the super_operations structure
 592  * for HFS file systems.  The purpose is to take that changes made to
 593  * an inode and apply then in a filesystem-dependent manner.  In this
 594  * case the process has a few of tasks to do:
 595  *  1) prevent changes to the i_uid and i_gid fields.
 596  *  2) map file permissions to the closest allowable permissions
 597  *  3) Since multiple Linux files can share the same on-disk inode under
 598  *     HFS (for instance the data and resource forks of a file) a change
 599  *     to permissions must be applied to all other in-core inodes which
 600  *     correspond to the same HFS file.
 601  */
 602
 603 int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
 604 {
 605         struct inode *inode = d_inode(dentry);
 606         struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
 607         int error;
 608
 609         error = setattr_prepare(dentry, attr); /* basic permission checks */
 610         if (error)
 611                 return error;
 612
 613         /* no uig/gid changes and limit which mode bits can be set */
 614         if (((attr->ia_valid & ATTR_UID) &&
 615              (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
 616             ((attr->ia_valid & ATTR_GID) &&
 617              (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
 618             ((attr->ia_valid & ATTR_MODE) &&
 619              ((S_ISDIR(inode->i_mode) &&
 620                (attr->ia_mode != inode->i_mode)) ||
 621               (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
 622                 return hsb->s_quiet ? 0 : error;
 623         }
 624
 625         if (attr->ia_valid & ATTR_MODE) {
 626                 /* Only the 'w' bits can ever change and only all together. */
 627                 if (attr->ia_mode & S_IWUSR)
 628                         attr->ia_mode = inode->i_mode | S_IWUGO;
 629                 else
 630                         attr->ia_mode = inode->i_mode & ~S_IWUGO;
 631                 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
 632         }
 633
 634         if ((attr->ia_valid & ATTR_SIZE) &&
 635             attr->ia_size != i_size_read(inode)) {
 636                 inode_dio_wait(inode);
 637
 638                 error = inode_newsize_ok(inode, attr->ia_size);
 639                 if (error)
 640                         return error;
 641
 642                 truncate_setsize(inode, attr->ia_size);
 643                 hfs_file_truncate(inode);
 644         }
 645
 646         setattr_copy(inode, attr);
 647         mark_inode_dirty(inode);
 648         return 0;
 649 }
 650
 651 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
 652                           int datasync)
 653 {
 654         struct inode *inode = filp->f_mapping->host;
 655         struct super_block * sb;
 656         int ret, err;
 657
 658         ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
 659         if (ret)
 660                 return ret;
 661         inode_lock(inode);
 662
 663         /* sync the inode to buffers */
 664         ret = write_inode_now(inode, 0);
 665
 666         /* sync the superblock to buffers */
 667         sb = inode->i_sb;
 668         flush_delayed_work(&HFS_SB(sb)->mdb_work);
 669         /* .. finally sync the buffers to disk */
 670         err = sync_blockdev(sb->s_bdev);
 671         if (!ret)
 672                 ret = err;
 673         inode_unlock(inode);
 674         return ret;
 675 }
 676
 677 static const struct file_operations hfs_file_operations = {
 678         .llseek         = generic_file_llseek,
 679         .read_iter      = generic_file_read_iter,
 680         .write_iter     = generic_file_write_iter,
 681         .mmap           = generic_file_mmap,
 682         .splice_read    = generic_file_splice_read,
 683         .fsync          = hfs_file_fsync,
 684         .open           = hfs_file_open,
 685         .release        = hfs_file_release,
 686 };
 687
 688 static const struct inode_operations hfs_file_inode_operations = {
 689         .lookup         = hfs_file_lookup,
 690         .setattr        = hfs_inode_setattr,
 691         .listxattr      = generic_listxattr,
 692 };