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