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