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