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